/* * TLS shared functions * * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * http://www.ietf.org/rfc/rfc2246.txt * http://www.ietf.org/rfc/rfc4346.txt */ #include "common.h" #if defined(MBEDTLS_SSL_TLS_C) #include "mbedtls/platform.h" #include "mbedtls/ssl.h" #include "ssl_client.h" #include "ssl_debug_helpers.h" #include "ssl_misc.h" #include "mbedtls/debug.h" #include "mbedtls/error.h" #include "mbedtls/platform_util.h" #include "mbedtls/version.h" #include "mbedtls/constant_time.h" #include #if defined(MBEDTLS_USE_PSA_CRYPTO) #include "mbedtls/psa_util.h" #include "psa/crypto.h" #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) #include "mbedtls/oid.h" #endif #if defined(MBEDTLS_USE_PSA_CRYPTO) #define PSA_TO_MBEDTLS_ERR(status) PSA_TO_MBEDTLS_ERR_LIST(status, \ psa_to_ssl_errors, \ psa_generic_status_to_mbedtls) #define PSA_TO_MD_ERR(status) PSA_TO_MBEDTLS_ERR_LIST(status, \ psa_to_md_errors, \ psa_generic_status_to_mbedtls) #endif #if defined(MBEDTLS_TEST_HOOKS) static mbedtls_ssl_chk_buf_ptr_args chk_buf_ptr_fail_args; void mbedtls_ssl_set_chk_buf_ptr_fail_args( const uint8_t *cur, const uint8_t *end, size_t need) { chk_buf_ptr_fail_args.cur = cur; chk_buf_ptr_fail_args.end = end; chk_buf_ptr_fail_args.need = need; } void mbedtls_ssl_reset_chk_buf_ptr_fail_args(void) { memset(&chk_buf_ptr_fail_args, 0, sizeof(chk_buf_ptr_fail_args)); } int mbedtls_ssl_cmp_chk_buf_ptr_fail_args(mbedtls_ssl_chk_buf_ptr_args *args) { return (chk_buf_ptr_fail_args.cur != args->cur) || (chk_buf_ptr_fail_args.end != args->end) || (chk_buf_ptr_fail_args.need != args->need); } #endif /* MBEDTLS_TEST_HOOKS */ #if defined(MBEDTLS_SSL_PROTO_DTLS) #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) /* Top-level Connection ID API */ int mbedtls_ssl_conf_cid(mbedtls_ssl_config *conf, size_t len, int ignore_other_cid) { if (len > MBEDTLS_SSL_CID_IN_LEN_MAX) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_FAIL && ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_IGNORE) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->ignore_unexpected_cid = ignore_other_cid; conf->cid_len = len; return 0; } int mbedtls_ssl_set_cid(mbedtls_ssl_context *ssl, int enable, unsigned char const *own_cid, size_t own_cid_len) { if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->negotiate_cid = enable; if (enable == MBEDTLS_SSL_CID_DISABLED) { MBEDTLS_SSL_DEBUG_MSG(3, ("Disable use of CID extension.")); return 0; } MBEDTLS_SSL_DEBUG_MSG(3, ("Enable use of CID extension.")); MBEDTLS_SSL_DEBUG_BUF(3, "Own CID", own_cid, own_cid_len); if (own_cid_len != ssl->conf->cid_len) { MBEDTLS_SSL_DEBUG_MSG(3, ("CID length %u does not match CID length %u in config", (unsigned) own_cid_len, (unsigned) ssl->conf->cid_len)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(ssl->own_cid, own_cid, own_cid_len); /* Truncation is not an issue here because * MBEDTLS_SSL_CID_IN_LEN_MAX at most 255. */ ssl->own_cid_len = (uint8_t) own_cid_len; return 0; } int mbedtls_ssl_get_own_cid(mbedtls_ssl_context *ssl, int *enabled, unsigned char own_cid[MBEDTLS_SSL_CID_OUT_LEN_MAX], size_t *own_cid_len) { *enabled = MBEDTLS_SSL_CID_DISABLED; if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* We report MBEDTLS_SSL_CID_DISABLED in case the CID length is * zero as this is indistinguishable from not requesting to use * the CID extension. */ if (ssl->own_cid_len == 0 || ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED) { return 0; } if (own_cid_len != NULL) { *own_cid_len = ssl->own_cid_len; if (own_cid != NULL) { memcpy(own_cid, ssl->own_cid, ssl->own_cid_len); } } *enabled = MBEDTLS_SSL_CID_ENABLED; return 0; } int mbedtls_ssl_get_peer_cid(mbedtls_ssl_context *ssl, int *enabled, unsigned char peer_cid[MBEDTLS_SSL_CID_OUT_LEN_MAX], size_t *peer_cid_len) { *enabled = MBEDTLS_SSL_CID_DISABLED; if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || mbedtls_ssl_is_handshake_over(ssl) == 0) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* We report MBEDTLS_SSL_CID_DISABLED in case the CID extensions * were used, but client and server requested the empty CID. * This is indistinguishable from not using the CID extension * in the first place. */ if (ssl->transform_in->in_cid_len == 0 && ssl->transform_in->out_cid_len == 0) { return 0; } if (peer_cid_len != NULL) { *peer_cid_len = ssl->transform_in->out_cid_len; if (peer_cid != NULL) { memcpy(peer_cid, ssl->transform_in->out_cid, ssl->transform_in->out_cid_len); } } *enabled = MBEDTLS_SSL_CID_ENABLED; return 0; } #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) /* * Convert max_fragment_length codes to length. * RFC 6066 says: * enum{ * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255) * } MaxFragmentLength; * and we add 0 -> extension unused */ static unsigned int ssl_mfl_code_to_length(int mfl) { switch (mfl) { case MBEDTLS_SSL_MAX_FRAG_LEN_NONE: return MBEDTLS_TLS_EXT_ADV_CONTENT_LEN; case MBEDTLS_SSL_MAX_FRAG_LEN_512: return 512; case MBEDTLS_SSL_MAX_FRAG_LEN_1024: return 1024; case MBEDTLS_SSL_MAX_FRAG_LEN_2048: return 2048; case MBEDTLS_SSL_MAX_FRAG_LEN_4096: return 4096; default: return MBEDTLS_TLS_EXT_ADV_CONTENT_LEN; } } #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ int mbedtls_ssl_session_copy(mbedtls_ssl_session *dst, const mbedtls_ssl_session *src) { mbedtls_ssl_session_free(dst); memcpy(dst, src, sizeof(mbedtls_ssl_session)); #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) dst->ticket = NULL; #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && \ defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) dst->hostname = NULL; #endif #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) if (src->peer_cert != NULL) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; dst->peer_cert = mbedtls_calloc(1, sizeof(mbedtls_x509_crt)); if (dst->peer_cert == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } mbedtls_x509_crt_init(dst->peer_cert); if ((ret = mbedtls_x509_crt_parse_der(dst->peer_cert, src->peer_cert->raw.p, src->peer_cert->raw.len)) != 0) { mbedtls_free(dst->peer_cert); dst->peer_cert = NULL; return ret; } } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ if (src->peer_cert_digest != NULL) { dst->peer_cert_digest = mbedtls_calloc(1, src->peer_cert_digest_len); if (dst->peer_cert_digest == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(dst->peer_cert_digest, src->peer_cert_digest, src->peer_cert_digest_len); dst->peer_cert_digest_type = src->peer_cert_digest_type; dst->peer_cert_digest_len = src->peer_cert_digest_len; } #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) if (src->ticket != NULL) { dst->ticket = mbedtls_calloc(1, src->ticket_len); if (dst->ticket == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(dst->ticket, src->ticket, src->ticket_len); } #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && \ defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) if (src->endpoint == MBEDTLS_SSL_IS_CLIENT) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; ret = mbedtls_ssl_session_set_hostname(dst, src->hostname); if (ret != 0) { return ret; } } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 && MBEDTLS_SSL_SERVER_NAME_INDICATION */ #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ return 0; } #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) MBEDTLS_CHECK_RETURN_CRITICAL static int resize_buffer(unsigned char **buffer, size_t len_new, size_t *len_old) { unsigned char *resized_buffer = mbedtls_calloc(1, len_new); if (resized_buffer == NULL) { return -1; } /* We want to copy len_new bytes when downsizing the buffer, and * len_old bytes when upsizing, so we choose the smaller of two sizes, * to fit one buffer into another. Size checks, ensuring that no data is * lost, are done outside of this function. */ memcpy(resized_buffer, *buffer, (len_new < *len_old) ? len_new : *len_old); mbedtls_platform_zeroize(*buffer, *len_old); mbedtls_free(*buffer); *buffer = resized_buffer; *len_old = len_new; return 0; } static void handle_buffer_resizing(mbedtls_ssl_context *ssl, int downsizing, size_t in_buf_new_len, size_t out_buf_new_len) { int modified = 0; size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0; size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0; if (ssl->in_buf != NULL) { written_in = ssl->in_msg - ssl->in_buf; iv_offset_in = ssl->in_iv - ssl->in_buf; len_offset_in = ssl->in_len - ssl->in_buf; if (downsizing ? ssl->in_buf_len > in_buf_new_len && ssl->in_left < in_buf_new_len : ssl->in_buf_len < in_buf_new_len) { if (resize_buffer(&ssl->in_buf, in_buf_new_len, &ssl->in_buf_len) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("input buffer resizing failed - out of memory")); } else { MBEDTLS_SSL_DEBUG_MSG(2, ("Reallocating in_buf to %" MBEDTLS_PRINTF_SIZET, in_buf_new_len)); modified = 1; } } } if (ssl->out_buf != NULL) { written_out = ssl->out_msg - ssl->out_buf; iv_offset_out = ssl->out_iv - ssl->out_buf; len_offset_out = ssl->out_len - ssl->out_buf; if (downsizing ? ssl->out_buf_len > out_buf_new_len && ssl->out_left < out_buf_new_len : ssl->out_buf_len < out_buf_new_len) { if (resize_buffer(&ssl->out_buf, out_buf_new_len, &ssl->out_buf_len) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("output buffer resizing failed - out of memory")); } else { MBEDTLS_SSL_DEBUG_MSG(2, ("Reallocating out_buf to %" MBEDTLS_PRINTF_SIZET, out_buf_new_len)); modified = 1; } } } if (modified) { /* Update pointers here to avoid doing it twice. */ mbedtls_ssl_reset_in_out_pointers(ssl); /* Fields below might not be properly updated with record * splitting or with CID, so they are manually updated here. */ ssl->out_msg = ssl->out_buf + written_out; ssl->out_len = ssl->out_buf + len_offset_out; ssl->out_iv = ssl->out_buf + iv_offset_out; ssl->in_msg = ssl->in_buf + written_in; ssl->in_len = ssl->in_buf + len_offset_in; ssl->in_iv = ssl->in_buf + iv_offset_in; } } #endif /* MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) typedef int (*tls_prf_fn)(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen); static tls_prf_fn ssl_tls12prf_from_cs(int ciphersuite_id); #endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */ /* Type for the TLS PRF */ typedef int ssl_tls_prf_t(const unsigned char *, size_t, const char *, const unsigned char *, size_t, unsigned char *, size_t); MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_tls12_populate_transform(mbedtls_ssl_transform *transform, int ciphersuite, const unsigned char master[48], #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) int encrypt_then_mac, #endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */ ssl_tls_prf_t tls_prf, const unsigned char randbytes[64], mbedtls_ssl_protocol_version tls_version, unsigned endpoint, const mbedtls_ssl_context *ssl); #if defined(MBEDTLS_MD_CAN_SHA256) MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_sha256(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen); static int ssl_calc_verify_tls_sha256(const mbedtls_ssl_context *, unsigned char *, size_t *); static int ssl_calc_finished_tls_sha256(mbedtls_ssl_context *, unsigned char *, int); #endif /* MBEDTLS_MD_CAN_SHA256*/ #if defined(MBEDTLS_MD_CAN_SHA384) MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_sha384(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen); static int ssl_calc_verify_tls_sha384(const mbedtls_ssl_context *, unsigned char *, size_t *); static int ssl_calc_finished_tls_sha384(mbedtls_ssl_context *, unsigned char *, int); #endif /* MBEDTLS_MD_CAN_SHA384*/ static size_t ssl_tls12_session_save(const mbedtls_ssl_session *session, unsigned char *buf, size_t buf_len); MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_tls12_session_load(mbedtls_ssl_session *session, const unsigned char *buf, size_t len); #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ static int ssl_update_checksum_start(mbedtls_ssl_context *, const unsigned char *, size_t); #if defined(MBEDTLS_MD_CAN_SHA256) static int ssl_update_checksum_sha256(mbedtls_ssl_context *, const unsigned char *, size_t); #endif /* MBEDTLS_MD_CAN_SHA256*/ #if defined(MBEDTLS_MD_CAN_SHA384) static int ssl_update_checksum_sha384(mbedtls_ssl_context *, const unsigned char *, size_t); #endif /* MBEDTLS_MD_CAN_SHA384*/ int mbedtls_ssl_tls_prf(const mbedtls_tls_prf_types prf, const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { mbedtls_ssl_tls_prf_cb *tls_prf = NULL; switch (prf) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_MD_CAN_SHA384) case MBEDTLS_SSL_TLS_PRF_SHA384: tls_prf = tls_prf_sha384; break; #endif /* MBEDTLS_MD_CAN_SHA384*/ #if defined(MBEDTLS_MD_CAN_SHA256) case MBEDTLS_SSL_TLS_PRF_SHA256: tls_prf = tls_prf_sha256; break; #endif /* MBEDTLS_MD_CAN_SHA256*/ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ default: return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } return tls_prf(secret, slen, label, random, rlen, dstbuf, dlen); } #if defined(MBEDTLS_X509_CRT_PARSE_C) static void ssl_clear_peer_cert(mbedtls_ssl_session *session) { #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) if (session->peer_cert != NULL) { mbedtls_x509_crt_free(session->peer_cert); mbedtls_free(session->peer_cert); session->peer_cert = NULL; } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ if (session->peer_cert_digest != NULL) { /* Zeroization is not necessary. */ mbedtls_free(session->peer_cert_digest); session->peer_cert_digest = NULL; session->peer_cert_digest_type = MBEDTLS_MD_NONE; session->peer_cert_digest_len = 0; } #endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ } #endif /* MBEDTLS_X509_CRT_PARSE_C */ uint32_t mbedtls_ssl_get_extension_id(unsigned int extension_type) { switch (extension_type) { case MBEDTLS_TLS_EXT_SERVERNAME: return MBEDTLS_SSL_EXT_ID_SERVERNAME; case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH: return MBEDTLS_SSL_EXT_ID_MAX_FRAGMENT_LENGTH; case MBEDTLS_TLS_EXT_STATUS_REQUEST: return MBEDTLS_SSL_EXT_ID_STATUS_REQUEST; case MBEDTLS_TLS_EXT_SUPPORTED_GROUPS: return MBEDTLS_SSL_EXT_ID_SUPPORTED_GROUPS; case MBEDTLS_TLS_EXT_SIG_ALG: return MBEDTLS_SSL_EXT_ID_SIG_ALG; case MBEDTLS_TLS_EXT_USE_SRTP: return MBEDTLS_SSL_EXT_ID_USE_SRTP; case MBEDTLS_TLS_EXT_HEARTBEAT: return MBEDTLS_SSL_EXT_ID_HEARTBEAT; case MBEDTLS_TLS_EXT_ALPN: return MBEDTLS_SSL_EXT_ID_ALPN; case MBEDTLS_TLS_EXT_SCT: return MBEDTLS_SSL_EXT_ID_SCT; case MBEDTLS_TLS_EXT_CLI_CERT_TYPE: return MBEDTLS_SSL_EXT_ID_CLI_CERT_TYPE; case MBEDTLS_TLS_EXT_SERV_CERT_TYPE: return MBEDTLS_SSL_EXT_ID_SERV_CERT_TYPE; case MBEDTLS_TLS_EXT_PADDING: return MBEDTLS_SSL_EXT_ID_PADDING; case MBEDTLS_TLS_EXT_PRE_SHARED_KEY: return MBEDTLS_SSL_EXT_ID_PRE_SHARED_KEY; case MBEDTLS_TLS_EXT_EARLY_DATA: return MBEDTLS_SSL_EXT_ID_EARLY_DATA; case MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS: return MBEDTLS_SSL_EXT_ID_SUPPORTED_VERSIONS; case MBEDTLS_TLS_EXT_COOKIE: return MBEDTLS_SSL_EXT_ID_COOKIE; case MBEDTLS_TLS_EXT_PSK_KEY_EXCHANGE_MODES: return MBEDTLS_SSL_EXT_ID_PSK_KEY_EXCHANGE_MODES; case MBEDTLS_TLS_EXT_CERT_AUTH: return MBEDTLS_SSL_EXT_ID_CERT_AUTH; case MBEDTLS_TLS_EXT_OID_FILTERS: return MBEDTLS_SSL_EXT_ID_OID_FILTERS; case MBEDTLS_TLS_EXT_POST_HANDSHAKE_AUTH: return MBEDTLS_SSL_EXT_ID_POST_HANDSHAKE_AUTH; case MBEDTLS_TLS_EXT_SIG_ALG_CERT: return MBEDTLS_SSL_EXT_ID_SIG_ALG_CERT; case MBEDTLS_TLS_EXT_KEY_SHARE: return MBEDTLS_SSL_EXT_ID_KEY_SHARE; case MBEDTLS_TLS_EXT_TRUNCATED_HMAC: return MBEDTLS_SSL_EXT_ID_TRUNCATED_HMAC; case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS: return MBEDTLS_SSL_EXT_ID_SUPPORTED_POINT_FORMATS; case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC: return MBEDTLS_SSL_EXT_ID_ENCRYPT_THEN_MAC; case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET: return MBEDTLS_SSL_EXT_ID_EXTENDED_MASTER_SECRET; case MBEDTLS_TLS_EXT_RECORD_SIZE_LIMIT: return MBEDTLS_SSL_EXT_ID_RECORD_SIZE_LIMIT; case MBEDTLS_TLS_EXT_SESSION_TICKET: return MBEDTLS_SSL_EXT_ID_SESSION_TICKET; } return MBEDTLS_SSL_EXT_ID_UNRECOGNIZED; } uint32_t mbedtls_ssl_get_extension_mask(unsigned int extension_type) { return 1 << mbedtls_ssl_get_extension_id(extension_type); } #if defined(MBEDTLS_DEBUG_C) static const char *extension_name_table[] = { [MBEDTLS_SSL_EXT_ID_UNRECOGNIZED] = "unrecognized", [MBEDTLS_SSL_EXT_ID_SERVERNAME] = "server_name", [MBEDTLS_SSL_EXT_ID_MAX_FRAGMENT_LENGTH] = "max_fragment_length", [MBEDTLS_SSL_EXT_ID_STATUS_REQUEST] = "status_request", [MBEDTLS_SSL_EXT_ID_SUPPORTED_GROUPS] = "supported_groups", [MBEDTLS_SSL_EXT_ID_SIG_ALG] = "signature_algorithms", [MBEDTLS_SSL_EXT_ID_USE_SRTP] = "use_srtp", [MBEDTLS_SSL_EXT_ID_HEARTBEAT] = "heartbeat", [MBEDTLS_SSL_EXT_ID_ALPN] = "application_layer_protocol_negotiation", [MBEDTLS_SSL_EXT_ID_SCT] = "signed_certificate_timestamp", [MBEDTLS_SSL_EXT_ID_CLI_CERT_TYPE] = "client_certificate_type", [MBEDTLS_SSL_EXT_ID_SERV_CERT_TYPE] = "server_certificate_type", [MBEDTLS_SSL_EXT_ID_PADDING] = "padding", [MBEDTLS_SSL_EXT_ID_PRE_SHARED_KEY] = "pre_shared_key", [MBEDTLS_SSL_EXT_ID_EARLY_DATA] = "early_data", [MBEDTLS_SSL_EXT_ID_SUPPORTED_VERSIONS] = "supported_versions", [MBEDTLS_SSL_EXT_ID_COOKIE] = "cookie", [MBEDTLS_SSL_EXT_ID_PSK_KEY_EXCHANGE_MODES] = "psk_key_exchange_modes", [MBEDTLS_SSL_EXT_ID_CERT_AUTH] = "certificate_authorities", [MBEDTLS_SSL_EXT_ID_OID_FILTERS] = "oid_filters", [MBEDTLS_SSL_EXT_ID_POST_HANDSHAKE_AUTH] = "post_handshake_auth", [MBEDTLS_SSL_EXT_ID_SIG_ALG_CERT] = "signature_algorithms_cert", [MBEDTLS_SSL_EXT_ID_KEY_SHARE] = "key_share", [MBEDTLS_SSL_EXT_ID_TRUNCATED_HMAC] = "truncated_hmac", [MBEDTLS_SSL_EXT_ID_SUPPORTED_POINT_FORMATS] = "supported_point_formats", [MBEDTLS_SSL_EXT_ID_ENCRYPT_THEN_MAC] = "encrypt_then_mac", [MBEDTLS_SSL_EXT_ID_EXTENDED_MASTER_SECRET] = "extended_master_secret", [MBEDTLS_SSL_EXT_ID_SESSION_TICKET] = "session_ticket", [MBEDTLS_SSL_EXT_ID_RECORD_SIZE_LIMIT] = "record_size_limit" }; static unsigned int extension_type_table[] = { [MBEDTLS_SSL_EXT_ID_UNRECOGNIZED] = 0xff, [MBEDTLS_SSL_EXT_ID_SERVERNAME] = MBEDTLS_TLS_EXT_SERVERNAME, [MBEDTLS_SSL_EXT_ID_MAX_FRAGMENT_LENGTH] = MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH, [MBEDTLS_SSL_EXT_ID_STATUS_REQUEST] = MBEDTLS_TLS_EXT_STATUS_REQUEST, [MBEDTLS_SSL_EXT_ID_SUPPORTED_GROUPS] = MBEDTLS_TLS_EXT_SUPPORTED_GROUPS, [MBEDTLS_SSL_EXT_ID_SIG_ALG] = MBEDTLS_TLS_EXT_SIG_ALG, [MBEDTLS_SSL_EXT_ID_USE_SRTP] = MBEDTLS_TLS_EXT_USE_SRTP, [MBEDTLS_SSL_EXT_ID_HEARTBEAT] = MBEDTLS_TLS_EXT_HEARTBEAT, [MBEDTLS_SSL_EXT_ID_ALPN] = MBEDTLS_TLS_EXT_ALPN, [MBEDTLS_SSL_EXT_ID_SCT] = MBEDTLS_TLS_EXT_SCT, [MBEDTLS_SSL_EXT_ID_CLI_CERT_TYPE] = MBEDTLS_TLS_EXT_CLI_CERT_TYPE, [MBEDTLS_SSL_EXT_ID_SERV_CERT_TYPE] = MBEDTLS_TLS_EXT_SERV_CERT_TYPE, [MBEDTLS_SSL_EXT_ID_PADDING] = MBEDTLS_TLS_EXT_PADDING, [MBEDTLS_SSL_EXT_ID_PRE_SHARED_KEY] = MBEDTLS_TLS_EXT_PRE_SHARED_KEY, [MBEDTLS_SSL_EXT_ID_EARLY_DATA] = MBEDTLS_TLS_EXT_EARLY_DATA, [MBEDTLS_SSL_EXT_ID_SUPPORTED_VERSIONS] = MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS, [MBEDTLS_SSL_EXT_ID_COOKIE] = MBEDTLS_TLS_EXT_COOKIE, [MBEDTLS_SSL_EXT_ID_PSK_KEY_EXCHANGE_MODES] = MBEDTLS_TLS_EXT_PSK_KEY_EXCHANGE_MODES, [MBEDTLS_SSL_EXT_ID_CERT_AUTH] = MBEDTLS_TLS_EXT_CERT_AUTH, [MBEDTLS_SSL_EXT_ID_OID_FILTERS] = MBEDTLS_TLS_EXT_OID_FILTERS, [MBEDTLS_SSL_EXT_ID_POST_HANDSHAKE_AUTH] = MBEDTLS_TLS_EXT_POST_HANDSHAKE_AUTH, [MBEDTLS_SSL_EXT_ID_SIG_ALG_CERT] = MBEDTLS_TLS_EXT_SIG_ALG_CERT, [MBEDTLS_SSL_EXT_ID_KEY_SHARE] = MBEDTLS_TLS_EXT_KEY_SHARE, [MBEDTLS_SSL_EXT_ID_TRUNCATED_HMAC] = MBEDTLS_TLS_EXT_TRUNCATED_HMAC, [MBEDTLS_SSL_EXT_ID_SUPPORTED_POINT_FORMATS] = MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS, [MBEDTLS_SSL_EXT_ID_ENCRYPT_THEN_MAC] = MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC, [MBEDTLS_SSL_EXT_ID_EXTENDED_MASTER_SECRET] = MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET, [MBEDTLS_SSL_EXT_ID_SESSION_TICKET] = MBEDTLS_TLS_EXT_SESSION_TICKET, [MBEDTLS_SSL_EXT_ID_RECORD_SIZE_LIMIT] = MBEDTLS_TLS_EXT_RECORD_SIZE_LIMIT }; const char *mbedtls_ssl_get_extension_name(unsigned int extension_type) { return extension_name_table[ mbedtls_ssl_get_extension_id(extension_type)]; } static const char *ssl_tls13_get_hs_msg_name(int hs_msg_type) { switch (hs_msg_type) { case MBEDTLS_SSL_HS_CLIENT_HELLO: return "ClientHello"; case MBEDTLS_SSL_HS_SERVER_HELLO: return "ServerHello"; case MBEDTLS_SSL_TLS1_3_HS_HELLO_RETRY_REQUEST: return "HelloRetryRequest"; case MBEDTLS_SSL_HS_NEW_SESSION_TICKET: return "NewSessionTicket"; case MBEDTLS_SSL_HS_ENCRYPTED_EXTENSIONS: return "EncryptedExtensions"; case MBEDTLS_SSL_HS_CERTIFICATE: return "Certificate"; case MBEDTLS_SSL_HS_CERTIFICATE_REQUEST: return "CertificateRequest"; } return "Unknown"; } void mbedtls_ssl_print_extension(const mbedtls_ssl_context *ssl, int level, const char *file, int line, int hs_msg_type, unsigned int extension_type, const char *extra_msg0, const char *extra_msg1) { const char *extra_msg; if (extra_msg0 && extra_msg1) { mbedtls_debug_print_msg( ssl, level, file, line, "%s: %s(%u) extension %s %s.", ssl_tls13_get_hs_msg_name(hs_msg_type), mbedtls_ssl_get_extension_name(extension_type), extension_type, extra_msg0, extra_msg1); return; } extra_msg = extra_msg0 ? extra_msg0 : extra_msg1; if (extra_msg) { mbedtls_debug_print_msg( ssl, level, file, line, "%s: %s(%u) extension %s.", ssl_tls13_get_hs_msg_name(hs_msg_type), mbedtls_ssl_get_extension_name(extension_type), extension_type, extra_msg); return; } mbedtls_debug_print_msg( ssl, level, file, line, "%s: %s(%u) extension.", ssl_tls13_get_hs_msg_name(hs_msg_type), mbedtls_ssl_get_extension_name(extension_type), extension_type); } void mbedtls_ssl_print_extensions(const mbedtls_ssl_context *ssl, int level, const char *file, int line, int hs_msg_type, uint32_t extensions_mask, const char *extra) { for (unsigned i = 0; i < sizeof(extension_name_table) / sizeof(extension_name_table[0]); i++) { mbedtls_ssl_print_extension( ssl, level, file, line, hs_msg_type, extension_type_table[i], extensions_mask & (1 << i) ? "exists" : "does not exist", extra); } } #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_SESSION_TICKETS) #define ARRAY_LENGTH(a) (sizeof(a) / sizeof(*(a))) static const char *ticket_flag_name_table[] = { [0] = "ALLOW_PSK_RESUMPTION", [2] = "ALLOW_PSK_EPHEMERAL_RESUMPTION", [3] = "ALLOW_EARLY_DATA", }; void mbedtls_ssl_print_ticket_flags(const mbedtls_ssl_context *ssl, int level, const char *file, int line, unsigned int flags) { size_t i; mbedtls_debug_print_msg(ssl, level, file, line, "print ticket_flags (0x%02x)", flags); flags = flags & MBEDTLS_SSL_TLS1_3_TICKET_FLAGS_MASK; for (i = 0; i < ARRAY_LENGTH(ticket_flag_name_table); i++) { if ((flags & (1 << i))) { mbedtls_debug_print_msg(ssl, level, file, line, "- %s is set.", ticket_flag_name_table[i]); } } } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 && MBEDTLS_SSL_SESSION_TICKETS */ #endif /* MBEDTLS_DEBUG_C */ void mbedtls_ssl_optimize_checksum(mbedtls_ssl_context *ssl, const mbedtls_ssl_ciphersuite_t *ciphersuite_info) { ((void) ciphersuite_info); #if defined(MBEDTLS_MD_CAN_SHA384) if (ciphersuite_info->mac == MBEDTLS_MD_SHA384) { ssl->handshake->update_checksum = ssl_update_checksum_sha384; } else #endif #if defined(MBEDTLS_MD_CAN_SHA256) if (ciphersuite_info->mac != MBEDTLS_MD_SHA384) { ssl->handshake->update_checksum = ssl_update_checksum_sha256; } else #endif { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return; } } int mbedtls_ssl_add_hs_hdr_to_checksum(mbedtls_ssl_context *ssl, unsigned hs_type, size_t total_hs_len) { unsigned char hs_hdr[4]; /* Build HS header for checksum update. */ hs_hdr[0] = MBEDTLS_BYTE_0(hs_type); hs_hdr[1] = MBEDTLS_BYTE_2(total_hs_len); hs_hdr[2] = MBEDTLS_BYTE_1(total_hs_len); hs_hdr[3] = MBEDTLS_BYTE_0(total_hs_len); return ssl->handshake->update_checksum(ssl, hs_hdr, sizeof(hs_hdr)); } int mbedtls_ssl_add_hs_msg_to_checksum(mbedtls_ssl_context *ssl, unsigned hs_type, unsigned char const *msg, size_t msg_len) { int ret; ret = mbedtls_ssl_add_hs_hdr_to_checksum(ssl, hs_type, msg_len); if (ret != 0) { return ret; } return ssl->handshake->update_checksum(ssl, msg, msg_len); } int mbedtls_ssl_reset_checksum(mbedtls_ssl_context *ssl) { #if defined(MBEDTLS_MD_CAN_SHA256) || \ defined(MBEDTLS_MD_CAN_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_status_t status; #else int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #endif #else /* SHA-256 or SHA-384 */ ((void) ssl); #endif /* SHA-256 or SHA-384 */ #if defined(MBEDTLS_MD_CAN_SHA256) #if defined(MBEDTLS_USE_PSA_CRYPTO) status = psa_hash_abort(&ssl->handshake->fin_sha256_psa); if (status != PSA_SUCCESS) { return PSA_TO_MD_ERR(status); } status = psa_hash_setup(&ssl->handshake->fin_sha256_psa, PSA_ALG_SHA_256); if (status != PSA_SUCCESS) { return PSA_TO_MD_ERR(status); } #else mbedtls_md_free(&ssl->handshake->fin_sha256); mbedtls_md_init(&ssl->handshake->fin_sha256); ret = mbedtls_md_setup(&ssl->handshake->fin_sha256, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 0); if (ret != 0) { return ret; } ret = mbedtls_md_starts(&ssl->handshake->fin_sha256); if (ret != 0) { return ret; } #endif #endif #if defined(MBEDTLS_MD_CAN_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) status = psa_hash_abort(&ssl->handshake->fin_sha384_psa); if (status != PSA_SUCCESS) { return PSA_TO_MD_ERR(status); } status = psa_hash_setup(&ssl->handshake->fin_sha384_psa, PSA_ALG_SHA_384); if (status != PSA_SUCCESS) { return PSA_TO_MD_ERR(status); } #else mbedtls_md_free(&ssl->handshake->fin_sha384); mbedtls_md_init(&ssl->handshake->fin_sha384); ret = mbedtls_md_setup(&ssl->handshake->fin_sha384, mbedtls_md_info_from_type(MBEDTLS_MD_SHA384), 0); if (ret != 0) { return ret; } ret = mbedtls_md_starts(&ssl->handshake->fin_sha384); if (ret != 0) { return ret; } #endif #endif return 0; } static int ssl_update_checksum_start(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len) { #if defined(MBEDTLS_MD_CAN_SHA256) || \ defined(MBEDTLS_MD_CAN_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_status_t status; #else int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #endif #else /* SHA-256 or SHA-384 */ ((void) ssl); (void) buf; (void) len; #endif /* SHA-256 or SHA-384 */ #if defined(MBEDTLS_MD_CAN_SHA256) #if defined(MBEDTLS_USE_PSA_CRYPTO) status = psa_hash_update(&ssl->handshake->fin_sha256_psa, buf, len); if (status != PSA_SUCCESS) { return PSA_TO_MD_ERR(status); } #else ret = mbedtls_md_update(&ssl->handshake->fin_sha256, buf, len); if (ret != 0) { return ret; } #endif #endif #if defined(MBEDTLS_MD_CAN_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) status = psa_hash_update(&ssl->handshake->fin_sha384_psa, buf, len); if (status != PSA_SUCCESS) { return PSA_TO_MD_ERR(status); } #else ret = mbedtls_md_update(&ssl->handshake->fin_sha384, buf, len); if (ret != 0) { return ret; } #endif #endif return 0; } #if defined(MBEDTLS_MD_CAN_SHA256) static int ssl_update_checksum_sha256(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len) { #if defined(MBEDTLS_USE_PSA_CRYPTO) return PSA_TO_MD_ERR(psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len)); #else return mbedtls_md_update(&ssl->handshake->fin_sha256, buf, len); #endif } #endif #if defined(MBEDTLS_MD_CAN_SHA384) static int ssl_update_checksum_sha384(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len) { #if defined(MBEDTLS_USE_PSA_CRYPTO) return PSA_TO_MD_ERR(psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len)); #else return mbedtls_md_update(&ssl->handshake->fin_sha384, buf, len); #endif } #endif static void ssl_handshake_params_init(mbedtls_ssl_handshake_params *handshake) { memset(handshake, 0, sizeof(mbedtls_ssl_handshake_params)); #if defined(MBEDTLS_MD_CAN_SHA256) #if defined(MBEDTLS_USE_PSA_CRYPTO) handshake->fin_sha256_psa = psa_hash_operation_init(); #else mbedtls_md_init(&handshake->fin_sha256); #endif #endif #if defined(MBEDTLS_MD_CAN_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) handshake->fin_sha384_psa = psa_hash_operation_init(); #else mbedtls_md_init(&handshake->fin_sha384); #endif #endif handshake->update_checksum = ssl_update_checksum_start; #if defined(MBEDTLS_DHM_C) mbedtls_dhm_init(&handshake->dhm_ctx); #endif #if !defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_ECDH_C) mbedtls_ecdh_init(&handshake->ecdh_ctx); #endif #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) #if defined(MBEDTLS_USE_PSA_CRYPTO) handshake->psa_pake_ctx = psa_pake_operation_init(); handshake->psa_pake_password = MBEDTLS_SVC_KEY_ID_INIT; #else mbedtls_ecjpake_init(&handshake->ecjpake_ctx); #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_SSL_CLI_C) handshake->ecjpake_cache = NULL; handshake->ecjpake_cache_len = 0; #endif #endif #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) mbedtls_x509_crt_restart_init(&handshake->ecrs_ctx); #endif #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET; #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) mbedtls_pk_init(&handshake->peer_pubkey); #endif } void mbedtls_ssl_transform_init(mbedtls_ssl_transform *transform) { memset(transform, 0, sizeof(mbedtls_ssl_transform)); #if defined(MBEDTLS_USE_PSA_CRYPTO) transform->psa_key_enc = MBEDTLS_SVC_KEY_ID_INIT; transform->psa_key_dec = MBEDTLS_SVC_KEY_ID_INIT; #else mbedtls_cipher_init(&transform->cipher_ctx_enc); mbedtls_cipher_init(&transform->cipher_ctx_dec); #endif #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC) #if defined(MBEDTLS_USE_PSA_CRYPTO) transform->psa_mac_enc = MBEDTLS_SVC_KEY_ID_INIT; transform->psa_mac_dec = MBEDTLS_SVC_KEY_ID_INIT; #else mbedtls_md_init(&transform->md_ctx_enc); mbedtls_md_init(&transform->md_ctx_dec); #endif #endif } void mbedtls_ssl_session_init(mbedtls_ssl_session *session) { memset(session, 0, sizeof(mbedtls_ssl_session)); } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_handshake_init(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* Clear old handshake information if present */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (ssl->transform_negotiate) { mbedtls_ssl_transform_free(ssl->transform_negotiate); } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ if (ssl->session_negotiate) { mbedtls_ssl_session_free(ssl->session_negotiate); } if (ssl->handshake) { mbedtls_ssl_handshake_free(ssl); } #if defined(MBEDTLS_SSL_PROTO_TLS1_2) /* * Either the pointers are now NULL or cleared properly and can be freed. * Now allocate missing structures. */ if (ssl->transform_negotiate == NULL) { ssl->transform_negotiate = mbedtls_calloc(1, sizeof(mbedtls_ssl_transform)); } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ if (ssl->session_negotiate == NULL) { ssl->session_negotiate = mbedtls_calloc(1, sizeof(mbedtls_ssl_session)); } if (ssl->handshake == NULL) { ssl->handshake = mbedtls_calloc(1, sizeof(mbedtls_ssl_handshake_params)); } #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) /* If the buffers are too small - reallocate */ handle_buffer_resizing(ssl, 0, MBEDTLS_SSL_IN_BUFFER_LEN, MBEDTLS_SSL_OUT_BUFFER_LEN); #endif /* All pointers should exist and can be directly freed without issue */ if (ssl->handshake == NULL || #if defined(MBEDTLS_SSL_PROTO_TLS1_2) ssl->transform_negotiate == NULL || #endif ssl->session_negotiate == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc() of ssl sub-contexts failed")); mbedtls_free(ssl->handshake); ssl->handshake = NULL; #if defined(MBEDTLS_SSL_PROTO_TLS1_2) mbedtls_free(ssl->transform_negotiate); ssl->transform_negotiate = NULL; #endif mbedtls_free(ssl->session_negotiate); ssl->session_negotiate = NULL; return MBEDTLS_ERR_SSL_ALLOC_FAILED; } /* Initialize structures */ mbedtls_ssl_session_init(ssl->session_negotiate); ssl_handshake_params_init(ssl->handshake); #if defined(MBEDTLS_SSL_PROTO_TLS1_2) mbedtls_ssl_transform_init(ssl->transform_negotiate); #endif /* Setup handshake checksums */ ret = mbedtls_ssl_reset_checksum(ssl); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_reset_checksum", ret); return ret; } #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && \ defined(MBEDTLS_SSL_SRV_C) && \ defined(MBEDTLS_SSL_SESSION_TICKETS) ssl->handshake->new_session_tickets_count = ssl->conf->new_session_tickets_count; #endif #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { ssl->handshake->alt_transform_out = ssl->transform_out; if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING; } else { ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; } mbedtls_ssl_set_timer(ssl, 0); } #endif /* * curve_list is translated to IANA TLS group identifiers here because * mbedtls_ssl_conf_curves returns void and so can't return * any error codes. */ #if defined(MBEDTLS_ECP_C) #if !defined(MBEDTLS_DEPRECATED_REMOVED) /* Heap allocate and translate curve_list from internal to IANA group ids */ if (ssl->conf->curve_list != NULL) { size_t length; const mbedtls_ecp_group_id *curve_list = ssl->conf->curve_list; for (length = 0; (curve_list[length] != MBEDTLS_ECP_DP_NONE) && (length < MBEDTLS_ECP_DP_MAX); length++) { } /* Leave room for zero termination */ uint16_t *group_list = mbedtls_calloc(length + 1, sizeof(uint16_t)); if (group_list == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } for (size_t i = 0; i < length; i++) { uint16_t tls_id = mbedtls_ssl_get_tls_id_from_ecp_group_id( curve_list[i]); if (tls_id == 0) { mbedtls_free(group_list); return MBEDTLS_ERR_SSL_BAD_CONFIG; } group_list[i] = tls_id; } group_list[length] = 0; ssl->handshake->group_list = group_list; ssl->handshake->group_list_heap_allocated = 1; } else { ssl->handshake->group_list = ssl->conf->group_list; ssl->handshake->group_list_heap_allocated = 0; } #endif /* MBEDTLS_DEPRECATED_REMOVED */ #endif /* MBEDTLS_ECP_C */ #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) #if !defined(MBEDTLS_DEPRECATED_REMOVED) #if defined(MBEDTLS_SSL_PROTO_TLS1_2) /* Heap allocate and translate sig_hashes from internal hash identifiers to signature algorithms IANA identifiers. */ if (mbedtls_ssl_conf_is_tls12_only(ssl->conf) && ssl->conf->sig_hashes != NULL) { const int *md; const int *sig_hashes = ssl->conf->sig_hashes; size_t sig_algs_len = 0; uint16_t *p; MBEDTLS_STATIC_ASSERT(MBEDTLS_SSL_MAX_SIG_ALG_LIST_LEN <= (SIZE_MAX - (2 * sizeof(uint16_t))), "MBEDTLS_SSL_MAX_SIG_ALG_LIST_LEN too big"); for (md = sig_hashes; *md != MBEDTLS_MD_NONE; md++) { if (mbedtls_ssl_hash_from_md_alg(*md) == MBEDTLS_SSL_HASH_NONE) { continue; } #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) sig_algs_len += sizeof(uint16_t); #endif #if defined(MBEDTLS_RSA_C) sig_algs_len += sizeof(uint16_t); #endif if (sig_algs_len > MBEDTLS_SSL_MAX_SIG_ALG_LIST_LEN) { return MBEDTLS_ERR_SSL_BAD_CONFIG; } } if (sig_algs_len < MBEDTLS_SSL_MIN_SIG_ALG_LIST_LEN) { return MBEDTLS_ERR_SSL_BAD_CONFIG; } ssl->handshake->sig_algs = mbedtls_calloc(1, sig_algs_len + sizeof(uint16_t)); if (ssl->handshake->sig_algs == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } p = (uint16_t *) ssl->handshake->sig_algs; for (md = sig_hashes; *md != MBEDTLS_MD_NONE; md++) { unsigned char hash = mbedtls_ssl_hash_from_md_alg(*md); if (hash == MBEDTLS_SSL_HASH_NONE) { continue; } #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) *p = ((hash << 8) | MBEDTLS_SSL_SIG_ECDSA); p++; #endif #if defined(MBEDTLS_RSA_C) *p = ((hash << 8) | MBEDTLS_SSL_SIG_RSA); p++; #endif } *p = MBEDTLS_TLS_SIG_NONE; ssl->handshake->sig_algs_heap_allocated = 1; } else #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ { ssl->handshake->sig_algs_heap_allocated = 0; } #endif /* !MBEDTLS_DEPRECATED_REMOVED */ #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ return 0; } #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) /* Dummy cookie callbacks for defaults */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_cookie_write_dummy(void *ctx, unsigned char **p, unsigned char *end, const unsigned char *cli_id, size_t cli_id_len) { ((void) ctx); ((void) p); ((void) end); ((void) cli_id); ((void) cli_id_len); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_cookie_check_dummy(void *ctx, const unsigned char *cookie, size_t cookie_len, const unsigned char *cli_id, size_t cli_id_len) { ((void) ctx); ((void) cookie); ((void) cookie_len); ((void) cli_id); ((void) cli_id_len); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */ /* * Initialize an SSL context */ void mbedtls_ssl_init(mbedtls_ssl_context *ssl) { memset(ssl, 0, sizeof(mbedtls_ssl_context)); } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_conf_version_check(const mbedtls_ssl_context *ssl) { const mbedtls_ssl_config *conf = ssl->conf; #if defined(MBEDTLS_SSL_PROTO_TLS1_3) if (mbedtls_ssl_conf_is_tls13_only(conf)) { if (conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { MBEDTLS_SSL_DEBUG_MSG(1, ("DTLS 1.3 is not yet supported.")); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } MBEDTLS_SSL_DEBUG_MSG(4, ("The SSL configuration is tls13 only.")); return 0; } #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (mbedtls_ssl_conf_is_tls12_only(conf)) { MBEDTLS_SSL_DEBUG_MSG(4, ("The SSL configuration is tls12 only.")); return 0; } #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && defined(MBEDTLS_SSL_PROTO_TLS1_3) if (mbedtls_ssl_conf_is_hybrid_tls12_tls13(conf)) { if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { MBEDTLS_SSL_DEBUG_MSG(1, ("DTLS not yet supported in Hybrid TLS 1.3 + TLS 1.2")); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } if (conf->endpoint == MBEDTLS_SSL_IS_SERVER) { MBEDTLS_SSL_DEBUG_MSG(1, ("TLS 1.3 server is not supported yet.")); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } MBEDTLS_SSL_DEBUG_MSG(4, ("The SSL configuration is TLS 1.3 or TLS 1.2.")); return 0; } #endif MBEDTLS_SSL_DEBUG_MSG(1, ("The SSL configuration is invalid.")); return MBEDTLS_ERR_SSL_BAD_CONFIG; } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_conf_check(const mbedtls_ssl_context *ssl) { int ret; ret = ssl_conf_version_check(ssl); if (ret != 0) { return ret; } #if defined(MBEDTLS_SSL_PROTO_TLS1_3) /* RFC 8446 section 4.4.3 * * If the verification fails, the receiver MUST terminate the handshake with * a "decrypt_error" alert. * * If the client is configured as TLS 1.3 only with optional verify, return * bad config. * */ if (mbedtls_ssl_conf_tls13_ephemeral_enabled( (mbedtls_ssl_context *) ssl) && ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && ssl->conf->max_tls_version == MBEDTLS_SSL_VERSION_TLS1_3 && ssl->conf->min_tls_version == MBEDTLS_SSL_VERSION_TLS1_3 && ssl->conf->authmode == MBEDTLS_SSL_VERIFY_OPTIONAL) { MBEDTLS_SSL_DEBUG_MSG( 1, ("Optional verify auth mode " "is not available for TLS 1.3 client")); return MBEDTLS_ERR_SSL_BAD_CONFIG; } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ /* Space for further checks */ return 0; } /* * Setup an SSL context */ int mbedtls_ssl_setup(mbedtls_ssl_context *ssl, const mbedtls_ssl_config *conf) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN; size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN; ssl->conf = conf; if ((ret = ssl_conf_check(ssl)) != 0) { return ret; } /* * Prepare base structures */ /* Set to NULL in case of an error condition */ ssl->out_buf = NULL; #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) ssl->in_buf_len = in_buf_len; #endif ssl->in_buf = mbedtls_calloc(1, in_buf_len); if (ssl->in_buf == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", in_buf_len)); ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; goto error; } #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) ssl->out_buf_len = out_buf_len; #endif ssl->out_buf = mbedtls_calloc(1, out_buf_len); if (ssl->out_buf == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", out_buf_len)); ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; goto error; } mbedtls_ssl_reset_in_out_pointers(ssl); #if defined(MBEDTLS_SSL_DTLS_SRTP) memset(&ssl->dtls_srtp_info, 0, sizeof(ssl->dtls_srtp_info)); #endif if ((ret = ssl_handshake_init(ssl)) != 0) { goto error; } return 0; error: mbedtls_free(ssl->in_buf); mbedtls_free(ssl->out_buf); ssl->conf = NULL; #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) ssl->in_buf_len = 0; ssl->out_buf_len = 0; #endif ssl->in_buf = NULL; ssl->out_buf = NULL; ssl->in_hdr = NULL; ssl->in_ctr = NULL; ssl->in_len = NULL; ssl->in_iv = NULL; ssl->in_msg = NULL; ssl->out_hdr = NULL; ssl->out_ctr = NULL; ssl->out_len = NULL; ssl->out_iv = NULL; ssl->out_msg = NULL; return ret; } /* * Reset an initialized and used SSL context for re-use while retaining * all application-set variables, function pointers and data. * * If partial is non-zero, keep data in the input buffer and client ID. * (Use when a DTLS client reconnects from the same port.) */ void mbedtls_ssl_session_reset_msg_layer(mbedtls_ssl_context *ssl, int partial) { #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) size_t in_buf_len = ssl->in_buf_len; size_t out_buf_len = ssl->out_buf_len; #else size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN; size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN; #endif #if !defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) || !defined(MBEDTLS_SSL_SRV_C) partial = 0; #endif /* Cancel any possibly running timer */ mbedtls_ssl_set_timer(ssl, 0); mbedtls_ssl_reset_in_out_pointers(ssl); /* Reset incoming message parsing */ ssl->in_offt = NULL; ssl->nb_zero = 0; ssl->in_msgtype = 0; ssl->in_msglen = 0; ssl->in_hslen = 0; ssl->keep_current_message = 0; ssl->transform_in = NULL; #if defined(MBEDTLS_SSL_PROTO_DTLS) ssl->next_record_offset = 0; ssl->in_epoch = 0; #endif /* Keep current datagram if partial == 1 */ if (partial == 0) { ssl->in_left = 0; memset(ssl->in_buf, 0, in_buf_len); } ssl->send_alert = 0; /* Reset outgoing message writing */ ssl->out_msgtype = 0; ssl->out_msglen = 0; ssl->out_left = 0; memset(ssl->out_buf, 0, out_buf_len); memset(ssl->cur_out_ctr, 0, sizeof(ssl->cur_out_ctr)); ssl->transform_out = NULL; #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) mbedtls_ssl_dtls_replay_reset(ssl); #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (ssl->transform) { mbedtls_ssl_transform_free(ssl->transform); mbedtls_free(ssl->transform); ssl->transform = NULL; } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_3) mbedtls_ssl_transform_free(ssl->transform_application); mbedtls_free(ssl->transform_application); ssl->transform_application = NULL; if (ssl->handshake != NULL) { #if defined(MBEDTLS_SSL_EARLY_DATA) mbedtls_ssl_transform_free(ssl->handshake->transform_earlydata); mbedtls_free(ssl->handshake->transform_earlydata); ssl->handshake->transform_earlydata = NULL; #endif mbedtls_ssl_transform_free(ssl->handshake->transform_handshake); mbedtls_free(ssl->handshake->transform_handshake); ssl->handshake->transform_handshake = NULL; } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ } int mbedtls_ssl_session_reset_int(mbedtls_ssl_context *ssl, int partial) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; ssl->state = MBEDTLS_SSL_HELLO_REQUEST; mbedtls_ssl_session_reset_msg_layer(ssl, partial); /* Reset renegotiation state */ #if defined(MBEDTLS_SSL_RENEGOTIATION) ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE; ssl->renego_records_seen = 0; ssl->verify_data_len = 0; memset(ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN); memset(ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN); #endif ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION; ssl->session_in = NULL; ssl->session_out = NULL; if (ssl->session) { mbedtls_ssl_session_free(ssl->session); mbedtls_free(ssl->session); ssl->session = NULL; } #if defined(MBEDTLS_SSL_ALPN) ssl->alpn_chosen = NULL; #endif #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) int free_cli_id = 1; #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) free_cli_id = (partial == 0); #endif if (free_cli_id) { mbedtls_free(ssl->cli_id); ssl->cli_id = NULL; ssl->cli_id_len = 0; } #endif if ((ret = ssl_handshake_init(ssl)) != 0) { return ret; } return 0; } /* * Reset an initialized and used SSL context for re-use while retaining * all application-set variables, function pointers and data. */ int mbedtls_ssl_session_reset(mbedtls_ssl_context *ssl) { return mbedtls_ssl_session_reset_int(ssl, 0); } /* * SSL set accessors */ void mbedtls_ssl_conf_endpoint(mbedtls_ssl_config *conf, int endpoint) { conf->endpoint = endpoint; } void mbedtls_ssl_conf_transport(mbedtls_ssl_config *conf, int transport) { conf->transport = transport; } #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) void mbedtls_ssl_conf_dtls_anti_replay(mbedtls_ssl_config *conf, char mode) { conf->anti_replay = mode; } #endif void mbedtls_ssl_conf_dtls_badmac_limit(mbedtls_ssl_config *conf, unsigned limit) { conf->badmac_limit = limit; } #if defined(MBEDTLS_SSL_PROTO_DTLS) void mbedtls_ssl_set_datagram_packing(mbedtls_ssl_context *ssl, unsigned allow_packing) { ssl->disable_datagram_packing = !allow_packing; } void mbedtls_ssl_conf_handshake_timeout(mbedtls_ssl_config *conf, uint32_t min, uint32_t max) { conf->hs_timeout_min = min; conf->hs_timeout_max = max; } #endif void mbedtls_ssl_conf_authmode(mbedtls_ssl_config *conf, int authmode) { conf->authmode = authmode; } #if defined(MBEDTLS_X509_CRT_PARSE_C) void mbedtls_ssl_conf_verify(mbedtls_ssl_config *conf, int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), void *p_vrfy) { conf->f_vrfy = f_vrfy; conf->p_vrfy = p_vrfy; } #endif /* MBEDTLS_X509_CRT_PARSE_C */ void mbedtls_ssl_conf_rng(mbedtls_ssl_config *conf, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng) { conf->f_rng = f_rng; conf->p_rng = p_rng; } void mbedtls_ssl_conf_dbg(mbedtls_ssl_config *conf, void (*f_dbg)(void *, int, const char *, int, const char *), void *p_dbg) { conf->f_dbg = f_dbg; conf->p_dbg = p_dbg; } void mbedtls_ssl_set_bio(mbedtls_ssl_context *ssl, void *p_bio, mbedtls_ssl_send_t *f_send, mbedtls_ssl_recv_t *f_recv, mbedtls_ssl_recv_timeout_t *f_recv_timeout) { ssl->p_bio = p_bio; ssl->f_send = f_send; ssl->f_recv = f_recv; ssl->f_recv_timeout = f_recv_timeout; } #if defined(MBEDTLS_SSL_PROTO_DTLS) void mbedtls_ssl_set_mtu(mbedtls_ssl_context *ssl, uint16_t mtu) { ssl->mtu = mtu; } #endif void mbedtls_ssl_conf_read_timeout(mbedtls_ssl_config *conf, uint32_t timeout) { conf->read_timeout = timeout; } void mbedtls_ssl_set_timer_cb(mbedtls_ssl_context *ssl, void *p_timer, mbedtls_ssl_set_timer_t *f_set_timer, mbedtls_ssl_get_timer_t *f_get_timer) { ssl->p_timer = p_timer; ssl->f_set_timer = f_set_timer; ssl->f_get_timer = f_get_timer; /* Make sure we start with no timer running */ mbedtls_ssl_set_timer(ssl, 0); } #if defined(MBEDTLS_SSL_SRV_C) void mbedtls_ssl_conf_session_cache(mbedtls_ssl_config *conf, void *p_cache, mbedtls_ssl_cache_get_t *f_get_cache, mbedtls_ssl_cache_set_t *f_set_cache) { conf->p_cache = p_cache; conf->f_get_cache = f_get_cache; conf->f_set_cache = f_set_cache; } #endif /* MBEDTLS_SSL_SRV_C */ #if defined(MBEDTLS_SSL_CLI_C) int mbedtls_ssl_set_session(mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; if (ssl == NULL || session == NULL || ssl->session_negotiate == NULL || ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->handshake->resume == 1) { return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } #if defined(MBEDTLS_SSL_PROTO_TLS1_3) if (session->tls_version == MBEDTLS_SSL_VERSION_TLS1_3) { const mbedtls_ssl_ciphersuite_t *ciphersuite_info = mbedtls_ssl_ciphersuite_from_id(session->ciphersuite); if (mbedtls_ssl_validate_ciphersuite( ssl, ciphersuite_info, MBEDTLS_SSL_VERSION_TLS1_3, MBEDTLS_SSL_VERSION_TLS1_3) != 0) { MBEDTLS_SSL_DEBUG_MSG(4, ("%d is not a valid TLS 1.3 ciphersuite.", session->ciphersuite)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ if ((ret = mbedtls_ssl_session_copy(ssl->session_negotiate, session)) != 0) { return ret; } ssl->handshake->resume = 1; return 0; } #endif /* MBEDTLS_SSL_CLI_C */ void mbedtls_ssl_conf_ciphersuites(mbedtls_ssl_config *conf, const int *ciphersuites) { conf->ciphersuite_list = ciphersuites; } #if defined(MBEDTLS_SSL_PROTO_TLS1_3) void mbedtls_ssl_conf_tls13_key_exchange_modes(mbedtls_ssl_config *conf, const int kex_modes) { conf->tls13_kex_modes = kex_modes & MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_ALL; } #if defined(MBEDTLS_SSL_EARLY_DATA) void mbedtls_ssl_tls13_conf_early_data(mbedtls_ssl_config *conf, int early_data_enabled) { conf->early_data_enabled = early_data_enabled; } #if defined(MBEDTLS_SSL_SRV_C) void mbedtls_ssl_tls13_conf_max_early_data_size( mbedtls_ssl_config *conf, uint32_t max_early_data_size) { conf->max_early_data_size = max_early_data_size; } #endif /* MBEDTLS_SSL_SRV_C */ #endif /* MBEDTLS_SSL_EARLY_DATA */ #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ #if defined(MBEDTLS_X509_CRT_PARSE_C) void mbedtls_ssl_conf_cert_profile(mbedtls_ssl_config *conf, const mbedtls_x509_crt_profile *profile) { conf->cert_profile = profile; } static void ssl_key_cert_free(mbedtls_ssl_key_cert *key_cert) { mbedtls_ssl_key_cert *cur = key_cert, *next; while (cur != NULL) { next = cur->next; mbedtls_free(cur); cur = next; } } /* Append a new keycert entry to a (possibly empty) list */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_append_key_cert(mbedtls_ssl_key_cert **head, mbedtls_x509_crt *cert, mbedtls_pk_context *key) { mbedtls_ssl_key_cert *new_cert; if (cert == NULL) { /* Free list if cert is null */ ssl_key_cert_free(*head); *head = NULL; return 0; } new_cert = mbedtls_calloc(1, sizeof(mbedtls_ssl_key_cert)); if (new_cert == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } new_cert->cert = cert; new_cert->key = key; new_cert->next = NULL; /* Update head if the list was null, else add to the end */ if (*head == NULL) { *head = new_cert; } else { mbedtls_ssl_key_cert *cur = *head; while (cur->next != NULL) { cur = cur->next; } cur->next = new_cert; } return 0; } int mbedtls_ssl_conf_own_cert(mbedtls_ssl_config *conf, mbedtls_x509_crt *own_cert, mbedtls_pk_context *pk_key) { return ssl_append_key_cert(&conf->key_cert, own_cert, pk_key); } void mbedtls_ssl_conf_ca_chain(mbedtls_ssl_config *conf, mbedtls_x509_crt *ca_chain, mbedtls_x509_crl *ca_crl) { conf->ca_chain = ca_chain; conf->ca_crl = ca_crl; #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb() * cannot be used together. */ conf->f_ca_cb = NULL; conf->p_ca_cb = NULL; #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ } #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) void mbedtls_ssl_conf_ca_cb(mbedtls_ssl_config *conf, mbedtls_x509_crt_ca_cb_t f_ca_cb, void *p_ca_cb) { conf->f_ca_cb = f_ca_cb; conf->p_ca_cb = p_ca_cb; /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb() * cannot be used together. */ conf->ca_chain = NULL; conf->ca_crl = NULL; } #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) const unsigned char *mbedtls_ssl_get_hs_sni(mbedtls_ssl_context *ssl, size_t *name_len) { *name_len = ssl->handshake->sni_name_len; return ssl->handshake->sni_name; } int mbedtls_ssl_set_hs_own_cert(mbedtls_ssl_context *ssl, mbedtls_x509_crt *own_cert, mbedtls_pk_context *pk_key) { return ssl_append_key_cert(&ssl->handshake->sni_key_cert, own_cert, pk_key); } void mbedtls_ssl_set_hs_ca_chain(mbedtls_ssl_context *ssl, mbedtls_x509_crt *ca_chain, mbedtls_x509_crl *ca_crl) { ssl->handshake->sni_ca_chain = ca_chain; ssl->handshake->sni_ca_crl = ca_crl; } #if defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED) void mbedtls_ssl_set_hs_dn_hints(mbedtls_ssl_context *ssl, const mbedtls_x509_crt *crt) { ssl->handshake->dn_hints = crt; } #endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */ void mbedtls_ssl_set_hs_authmode(mbedtls_ssl_context *ssl, int authmode) { ssl->handshake->sni_authmode = authmode; } #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ #if defined(MBEDTLS_X509_CRT_PARSE_C) void mbedtls_ssl_set_verify(mbedtls_ssl_context *ssl, int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), void *p_vrfy) { ssl->f_vrfy = f_vrfy; ssl->p_vrfy = p_vrfy; } #endif #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) #if defined(MBEDTLS_USE_PSA_CRYPTO) static const uint8_t jpake_server_id[] = { 's', 'e', 'r', 'v', 'e', 'r' }; static const uint8_t jpake_client_id[] = { 'c', 'l', 'i', 'e', 'n', 't' }; static psa_status_t mbedtls_ssl_set_hs_ecjpake_password_common( mbedtls_ssl_context *ssl, mbedtls_svc_key_id_t pwd) { psa_status_t status; psa_pake_cipher_suite_t cipher_suite = psa_pake_cipher_suite_init(); const uint8_t *user = NULL; size_t user_len = 0; const uint8_t *peer = NULL; size_t peer_len = 0; psa_pake_cs_set_algorithm(&cipher_suite, PSA_ALG_JPAKE); psa_pake_cs_set_primitive(&cipher_suite, PSA_PAKE_PRIMITIVE(PSA_PAKE_PRIMITIVE_TYPE_ECC, PSA_ECC_FAMILY_SECP_R1, 256)); psa_pake_cs_set_hash(&cipher_suite, PSA_ALG_SHA_256); status = psa_pake_setup(&ssl->handshake->psa_pake_ctx, &cipher_suite); if (status != PSA_SUCCESS) { return status; } if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { user = jpake_server_id; user_len = sizeof(jpake_server_id); peer = jpake_client_id; peer_len = sizeof(jpake_client_id); } else { user = jpake_client_id; user_len = sizeof(jpake_client_id); peer = jpake_server_id; peer_len = sizeof(jpake_server_id); } status = psa_pake_set_user(&ssl->handshake->psa_pake_ctx, user, user_len); if (status != PSA_SUCCESS) { return status; } status = psa_pake_set_peer(&ssl->handshake->psa_pake_ctx, peer, peer_len); if (status != PSA_SUCCESS) { return status; } status = psa_pake_set_password_key(&ssl->handshake->psa_pake_ctx, pwd); if (status != PSA_SUCCESS) { return status; } ssl->handshake->psa_pake_ctx_is_ok = 1; return PSA_SUCCESS; } int mbedtls_ssl_set_hs_ecjpake_password(mbedtls_ssl_context *ssl, const unsigned char *pw, size_t pw_len) { psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; psa_status_t status; if (ssl->handshake == NULL || ssl->conf == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Empty password is not valid */ if ((pw == NULL) || (pw_len == 0)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_DERIVE); psa_set_key_algorithm(&attributes, PSA_ALG_JPAKE); psa_set_key_type(&attributes, PSA_KEY_TYPE_PASSWORD); status = psa_import_key(&attributes, pw, pw_len, &ssl->handshake->psa_pake_password); if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = mbedtls_ssl_set_hs_ecjpake_password_common(ssl, ssl->handshake->psa_pake_password); if (status != PSA_SUCCESS) { psa_destroy_key(ssl->handshake->psa_pake_password); psa_pake_abort(&ssl->handshake->psa_pake_ctx); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } return 0; } int mbedtls_ssl_set_hs_ecjpake_password_opaque(mbedtls_ssl_context *ssl, mbedtls_svc_key_id_t pwd) { psa_status_t status; if (ssl->handshake == NULL || ssl->conf == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (mbedtls_svc_key_id_is_null(pwd)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } status = mbedtls_ssl_set_hs_ecjpake_password_common(ssl, pwd); if (status != PSA_SUCCESS) { psa_pake_abort(&ssl->handshake->psa_pake_ctx); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } return 0; } #else /* MBEDTLS_USE_PSA_CRYPTO */ int mbedtls_ssl_set_hs_ecjpake_password(mbedtls_ssl_context *ssl, const unsigned char *pw, size_t pw_len) { mbedtls_ecjpake_role role; if (ssl->handshake == NULL || ssl->conf == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Empty password is not valid */ if ((pw == NULL) || (pw_len == 0)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { role = MBEDTLS_ECJPAKE_SERVER; } else { role = MBEDTLS_ECJPAKE_CLIENT; } return mbedtls_ecjpake_setup(&ssl->handshake->ecjpake_ctx, role, MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1, pw, pw_len); } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED) int mbedtls_ssl_conf_has_static_psk(mbedtls_ssl_config const *conf) { if (conf->psk_identity == NULL || conf->psk_identity_len == 0) { return 0; } #if defined(MBEDTLS_USE_PSA_CRYPTO) if (!mbedtls_svc_key_id_is_null(conf->psk_opaque)) { return 1; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ if (conf->psk != NULL && conf->psk_len != 0) { return 1; } return 0; } static void ssl_conf_remove_psk(mbedtls_ssl_config *conf) { /* Remove reference to existing PSK, if any. */ #if defined(MBEDTLS_USE_PSA_CRYPTO) if (!mbedtls_svc_key_id_is_null(conf->psk_opaque)) { /* The maintenance of the PSK key slot is the * user's responsibility. */ conf->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ if (conf->psk != NULL) { mbedtls_platform_zeroize(conf->psk, conf->psk_len); mbedtls_free(conf->psk); conf->psk = NULL; conf->psk_len = 0; } /* Remove reference to PSK identity, if any. */ if (conf->psk_identity != NULL) { mbedtls_free(conf->psk_identity); conf->psk_identity = NULL; conf->psk_identity_len = 0; } } /* This function assumes that PSK identity in the SSL config is unset. * It checks that the provided identity is well-formed and attempts * to make a copy of it in the SSL config. * On failure, the PSK identity in the config remains unset. */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_conf_set_psk_identity(mbedtls_ssl_config *conf, unsigned char const *psk_identity, size_t psk_identity_len) { /* Identity len will be encoded on two bytes */ if (psk_identity == NULL || psk_identity_len == 0 || (psk_identity_len >> 16) != 0 || psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->psk_identity = mbedtls_calloc(1, psk_identity_len); if (conf->psk_identity == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } conf->psk_identity_len = psk_identity_len; memcpy(conf->psk_identity, psk_identity, conf->psk_identity_len); return 0; } int mbedtls_ssl_conf_psk(mbedtls_ssl_config *conf, const unsigned char *psk, size_t psk_len, const unsigned char *psk_identity, size_t psk_identity_len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* We currently only support one PSK, raw or opaque. */ if (mbedtls_ssl_conf_has_static_psk(conf)) { return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } /* Check and set raw PSK */ if (psk == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (psk_len == 0) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (psk_len > MBEDTLS_PSK_MAX_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if ((conf->psk = mbedtls_calloc(1, psk_len)) == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } conf->psk_len = psk_len; memcpy(conf->psk, psk, conf->psk_len); /* Check and set PSK Identity */ ret = ssl_conf_set_psk_identity(conf, psk_identity, psk_identity_len); if (ret != 0) { ssl_conf_remove_psk(conf); } return ret; } static void ssl_remove_psk(mbedtls_ssl_context *ssl) { #if defined(MBEDTLS_USE_PSA_CRYPTO) if (!mbedtls_svc_key_id_is_null(ssl->handshake->psk_opaque)) { /* The maintenance of the external PSK key slot is the * user's responsibility. */ if (ssl->handshake->psk_opaque_is_internal) { psa_destroy_key(ssl->handshake->psk_opaque); ssl->handshake->psk_opaque_is_internal = 0; } ssl->handshake->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT; } #else if (ssl->handshake->psk != NULL) { mbedtls_platform_zeroize(ssl->handshake->psk, ssl->handshake->psk_len); mbedtls_free(ssl->handshake->psk); ssl->handshake->psk_len = 0; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ } int mbedtls_ssl_set_hs_psk(mbedtls_ssl_context *ssl, const unsigned char *psk, size_t psk_len) { #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_key_attributes_t key_attributes = psa_key_attributes_init(); psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED; psa_algorithm_t alg = PSA_ALG_NONE; mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT; #endif /* MBEDTLS_USE_PSA_CRYPTO */ if (psk == NULL || ssl->handshake == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (psk_len > MBEDTLS_PSK_MAX_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl_remove_psk(ssl); #if defined(MBEDTLS_USE_PSA_CRYPTO) #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (ssl->tls_version == MBEDTLS_SSL_VERSION_TLS1_2) { if (ssl->handshake->ciphersuite_info->mac == MBEDTLS_MD_SHA384) { alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384); } else { alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256); } psa_set_key_usage_flags(&key_attributes, PSA_KEY_USAGE_DERIVE); } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_3) if (ssl->tls_version == MBEDTLS_SSL_VERSION_TLS1_3) { alg = PSA_ALG_HKDF_EXTRACT(PSA_ALG_ANY_HASH); psa_set_key_usage_flags(&key_attributes, PSA_KEY_USAGE_DERIVE | PSA_KEY_USAGE_EXPORT); } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ psa_set_key_algorithm(&key_attributes, alg); psa_set_key_type(&key_attributes, PSA_KEY_TYPE_DERIVE); status = psa_import_key(&key_attributes, psk, psk_len, &key); if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } /* Allow calling psa_destroy_key() on psk remove */ ssl->handshake->psk_opaque_is_internal = 1; return mbedtls_ssl_set_hs_psk_opaque(ssl, key); #else if ((ssl->handshake->psk = mbedtls_calloc(1, psk_len)) == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } ssl->handshake->psk_len = psk_len; memcpy(ssl->handshake->psk, psk, ssl->handshake->psk_len); return 0; #endif /* MBEDTLS_USE_PSA_CRYPTO */ } #if defined(MBEDTLS_USE_PSA_CRYPTO) int mbedtls_ssl_conf_psk_opaque(mbedtls_ssl_config *conf, mbedtls_svc_key_id_t psk, const unsigned char *psk_identity, size_t psk_identity_len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* We currently only support one PSK, raw or opaque. */ if (mbedtls_ssl_conf_has_static_psk(conf)) { return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } /* Check and set opaque PSK */ if (mbedtls_svc_key_id_is_null(psk)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->psk_opaque = psk; /* Check and set PSK Identity */ ret = ssl_conf_set_psk_identity(conf, psk_identity, psk_identity_len); if (ret != 0) { ssl_conf_remove_psk(conf); } return ret; } int mbedtls_ssl_set_hs_psk_opaque(mbedtls_ssl_context *ssl, mbedtls_svc_key_id_t psk) { if ((mbedtls_svc_key_id_is_null(psk)) || (ssl->handshake == NULL)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl_remove_psk(ssl); ssl->handshake->psk_opaque = psk; return 0; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_SSL_SRV_C) void mbedtls_ssl_conf_psk_cb(mbedtls_ssl_config *conf, int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *, size_t), void *p_psk) { conf->f_psk = f_psk; conf->p_psk = p_psk; } #endif /* MBEDTLS_SSL_SRV_C */ #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED */ #if defined(MBEDTLS_USE_PSA_CRYPTO) static mbedtls_ssl_mode_t mbedtls_ssl_get_base_mode( psa_algorithm_t alg) { #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC) if (alg == PSA_ALG_CBC_NO_PADDING) { return MBEDTLS_SSL_MODE_CBC; } #endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */ if (PSA_ALG_IS_AEAD(alg)) { return MBEDTLS_SSL_MODE_AEAD; } return MBEDTLS_SSL_MODE_STREAM; } #else /* MBEDTLS_USE_PSA_CRYPTO */ static mbedtls_ssl_mode_t mbedtls_ssl_get_base_mode( mbedtls_cipher_mode_t mode) { #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC) if (mode == MBEDTLS_MODE_CBC) { return MBEDTLS_SSL_MODE_CBC; } #endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */ #if defined(MBEDTLS_GCM_C) || \ defined(MBEDTLS_CCM_C) || \ defined(MBEDTLS_CHACHAPOLY_C) if (mode == MBEDTLS_MODE_GCM || mode == MBEDTLS_MODE_CCM || mode == MBEDTLS_MODE_CHACHAPOLY) { return MBEDTLS_SSL_MODE_AEAD; } #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C */ return MBEDTLS_SSL_MODE_STREAM; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ static mbedtls_ssl_mode_t mbedtls_ssl_get_actual_mode( mbedtls_ssl_mode_t base_mode, int encrypt_then_mac) { #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) if (encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED && base_mode == MBEDTLS_SSL_MODE_CBC) { return MBEDTLS_SSL_MODE_CBC_ETM; } #else (void) encrypt_then_mac; #endif return base_mode; } mbedtls_ssl_mode_t mbedtls_ssl_get_mode_from_transform( const mbedtls_ssl_transform *transform) { mbedtls_ssl_mode_t base_mode = mbedtls_ssl_get_base_mode( #if defined(MBEDTLS_USE_PSA_CRYPTO) transform->psa_alg #else mbedtls_cipher_get_cipher_mode(&transform->cipher_ctx_enc) #endif ); int encrypt_then_mac = 0; #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) encrypt_then_mac = transform->encrypt_then_mac; #endif return mbedtls_ssl_get_actual_mode(base_mode, encrypt_then_mac); } mbedtls_ssl_mode_t mbedtls_ssl_get_mode_from_ciphersuite( #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) int encrypt_then_mac, #endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */ const mbedtls_ssl_ciphersuite_t *suite) { mbedtls_ssl_mode_t base_mode = MBEDTLS_SSL_MODE_STREAM; #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_status_t status; psa_algorithm_t alg; psa_key_type_t type; size_t size; status = mbedtls_ssl_cipher_to_psa(suite->cipher, 0, &alg, &type, &size); if (status == PSA_SUCCESS) { base_mode = mbedtls_ssl_get_base_mode(alg); } #else const mbedtls_cipher_info_t *cipher = mbedtls_cipher_info_from_type(suite->cipher); if (cipher != NULL) { base_mode = mbedtls_ssl_get_base_mode( mbedtls_cipher_info_get_mode(cipher)); } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if !defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) int encrypt_then_mac = 0; #endif return mbedtls_ssl_get_actual_mode(base_mode, encrypt_then_mac); } #if defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3) #if defined(MBEDTLS_SSL_PROTO_TLS1_3) /* Serialization of TLS 1.3 sessions: * * struct { * opaque hostname<0..2^16-1>; * uint64 ticket_received; * uint32 ticket_lifetime; * opaque ticket<1..2^16-1>; * } ClientOnlyData; * * struct { * uint8 endpoint; * uint8 ciphersuite[2]; * uint32 ticket_age_add; * uint8 ticket_flags; * opaque resumption_key<0..255>; * select ( endpoint ) { * case client: ClientOnlyData; * case server: uint64 start_time; * }; * } serialized_session_tls13; * */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_tls13_session_save(const mbedtls_ssl_session *session, unsigned char *buf, size_t buf_len, size_t *olen) { unsigned char *p = buf; #if defined(MBEDTLS_SSL_CLI_C) && \ defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) size_t hostname_len = (session->hostname == NULL) ? 0 : strlen(session->hostname) + 1; #endif size_t needed = 1 /* endpoint */ + 2 /* ciphersuite */ + 4 /* ticket_age_add */ + 1 /* ticket_flags */ + 1; /* resumption_key length */ *olen = 0; if (session->resumption_key_len > MBEDTLS_SSL_TLS1_3_TICKET_RESUMPTION_KEY_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } needed += session->resumption_key_len; /* resumption_key */ #if defined(MBEDTLS_HAVE_TIME) needed += 8; /* start_time or ticket_received */ #endif #if defined(MBEDTLS_SSL_CLI_C) if (session->endpoint == MBEDTLS_SSL_IS_CLIENT) { #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) needed += 2 /* hostname_len */ + hostname_len; /* hostname */ #endif needed += 4 /* ticket_lifetime */ + 2; /* ticket_len */ /* Check size_t overflow */ if (session->ticket_len > SIZE_MAX - needed) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } needed += session->ticket_len; /* ticket */ } #endif /* MBEDTLS_SSL_CLI_C */ *olen = needed; if (needed > buf_len) { return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL; } p[0] = session->endpoint; MBEDTLS_PUT_UINT16_BE(session->ciphersuite, p, 1); MBEDTLS_PUT_UINT32_BE(session->ticket_age_add, p, 3); p[7] = session->ticket_flags; /* save resumption_key */ p[8] = session->resumption_key_len; p += 9; memcpy(p, session->resumption_key, session->resumption_key_len); p += session->resumption_key_len; #if defined(MBEDTLS_HAVE_TIME) && defined(MBEDTLS_SSL_SRV_C) if (session->endpoint == MBEDTLS_SSL_IS_SERVER) { MBEDTLS_PUT_UINT64_BE((uint64_t) session->start, p, 0); p += 8; } #endif /* MBEDTLS_HAVE_TIME */ #if defined(MBEDTLS_SSL_CLI_C) if (session->endpoint == MBEDTLS_SSL_IS_CLIENT) { #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) MBEDTLS_PUT_UINT16_BE(hostname_len, p, 0); p += 2; if (hostname_len > 0) { /* save host name */ memcpy(p, session->hostname, hostname_len); p += hostname_len; } #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ #if defined(MBEDTLS_HAVE_TIME) MBEDTLS_PUT_UINT64_BE((uint64_t) session->ticket_received, p, 0); p += 8; #endif MBEDTLS_PUT_UINT32_BE(session->ticket_lifetime, p, 0); p += 4; MBEDTLS_PUT_UINT16_BE(session->ticket_len, p, 0); p += 2; if (session->ticket != NULL && session->ticket_len > 0) { memcpy(p, session->ticket, session->ticket_len); p += session->ticket_len; } } #endif /* MBEDTLS_SSL_CLI_C */ return 0; } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_tls13_session_load(mbedtls_ssl_session *session, const unsigned char *buf, size_t len) { const unsigned char *p = buf; const unsigned char *end = buf + len; if (end - p < 9) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->endpoint = p[0]; session->ciphersuite = MBEDTLS_GET_UINT16_BE(p, 1); session->ticket_age_add = MBEDTLS_GET_UINT32_BE(p, 3); session->ticket_flags = p[7]; /* load resumption_key */ session->resumption_key_len = p[8]; p += 9; if (end - p < session->resumption_key_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (sizeof(session->resumption_key) < session->resumption_key_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(session->resumption_key, p, session->resumption_key_len); p += session->resumption_key_len; #if defined(MBEDTLS_HAVE_TIME) && defined(MBEDTLS_SSL_SRV_C) if (session->endpoint == MBEDTLS_SSL_IS_SERVER) { if (end - p < 8) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->start = MBEDTLS_GET_UINT64_BE(p, 0); p += 8; } #endif /* MBEDTLS_HAVE_TIME */ #if defined(MBEDTLS_SSL_CLI_C) if (session->endpoint == MBEDTLS_SSL_IS_CLIENT) { #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) && \ defined(MBEDTLS_SSL_SESSION_TICKETS) size_t hostname_len; /* load host name */ if (end - p < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } hostname_len = MBEDTLS_GET_UINT16_BE(p, 0); p += 2; if (end - p < (long int) hostname_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (hostname_len > 0) { session->hostname = mbedtls_calloc(1, hostname_len); if (session->hostname == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(session->hostname, p, hostname_len); p += hostname_len; } #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION && MBEDTLS_SSL_SESSION_TICKETS */ #if defined(MBEDTLS_HAVE_TIME) if (end - p < 8) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ticket_received = MBEDTLS_GET_UINT64_BE(p, 0); p += 8; #endif if (end - p < 4) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ticket_lifetime = MBEDTLS_GET_UINT32_BE(p, 0); p += 4; if (end - p < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ticket_len = MBEDTLS_GET_UINT16_BE(p, 0); p += 2; if (end - p < (long int) session->ticket_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (session->ticket_len > 0) { session->ticket = mbedtls_calloc(1, session->ticket_len); if (session->ticket == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(session->ticket, p, session->ticket_len); p += session->ticket_len; } } #endif /* MBEDTLS_SSL_CLI_C */ return 0; } #else /* MBEDTLS_SSL_SESSION_TICKETS */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_tls13_session_save(const mbedtls_ssl_session *session, unsigned char *buf, size_t buf_len, size_t *olen) { ((void) session); ((void) buf); ((void) buf_len); *olen = 0; return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } static int ssl_tls13_session_load(const mbedtls_ssl_session *session, unsigned char *buf, size_t buf_len) { ((void) session); ((void) buf); ((void) buf_len); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } #endif /* !MBEDTLS_SSL_SESSION_TICKETS */ #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ psa_status_t mbedtls_ssl_cipher_to_psa(mbedtls_cipher_type_t mbedtls_cipher_type, size_t taglen, psa_algorithm_t *alg, psa_key_type_t *key_type, size_t *key_size) { switch (mbedtls_cipher_type) { case MBEDTLS_CIPHER_AES_128_CBC: *alg = PSA_ALG_CBC_NO_PADDING; *key_type = PSA_KEY_TYPE_AES; *key_size = 128; break; case MBEDTLS_CIPHER_AES_128_CCM: *alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen) : PSA_ALG_CCM; *key_type = PSA_KEY_TYPE_AES; *key_size = 128; break; case MBEDTLS_CIPHER_AES_128_GCM: *alg = PSA_ALG_GCM; *key_type = PSA_KEY_TYPE_AES; *key_size = 128; break; case MBEDTLS_CIPHER_AES_192_CCM: *alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen) : PSA_ALG_CCM; *key_type = PSA_KEY_TYPE_AES; *key_size = 192; break; case MBEDTLS_CIPHER_AES_192_GCM: *alg = PSA_ALG_GCM; *key_type = PSA_KEY_TYPE_AES; *key_size = 192; break; case MBEDTLS_CIPHER_AES_256_CBC: *alg = PSA_ALG_CBC_NO_PADDING; *key_type = PSA_KEY_TYPE_AES; *key_size = 256; break; case MBEDTLS_CIPHER_AES_256_CCM: *alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen) : PSA_ALG_CCM; *key_type = PSA_KEY_TYPE_AES; *key_size = 256; break; case MBEDTLS_CIPHER_AES_256_GCM: *alg = PSA_ALG_GCM; *key_type = PSA_KEY_TYPE_AES; *key_size = 256; break; case MBEDTLS_CIPHER_ARIA_128_CBC: *alg = PSA_ALG_CBC_NO_PADDING; *key_type = PSA_KEY_TYPE_ARIA; *key_size = 128; break; case MBEDTLS_CIPHER_ARIA_128_CCM: *alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen) : PSA_ALG_CCM; *key_type = PSA_KEY_TYPE_ARIA; *key_size = 128; break; case MBEDTLS_CIPHER_ARIA_128_GCM: *alg = PSA_ALG_GCM; *key_type = PSA_KEY_TYPE_ARIA; *key_size = 128; break; case MBEDTLS_CIPHER_ARIA_192_CCM: *alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen) : PSA_ALG_CCM; *key_type = PSA_KEY_TYPE_ARIA; *key_size = 192; break; case MBEDTLS_CIPHER_ARIA_192_GCM: *alg = PSA_ALG_GCM; *key_type = PSA_KEY_TYPE_ARIA; *key_size = 192; break; case MBEDTLS_CIPHER_ARIA_256_CBC: *alg = PSA_ALG_CBC_NO_PADDING; *key_type = PSA_KEY_TYPE_ARIA; *key_size = 256; break; case MBEDTLS_CIPHER_ARIA_256_CCM: *alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen) : PSA_ALG_CCM; *key_type = PSA_KEY_TYPE_ARIA; *key_size = 256; break; case MBEDTLS_CIPHER_ARIA_256_GCM: *alg = PSA_ALG_GCM; *key_type = PSA_KEY_TYPE_ARIA; *key_size = 256; break; case MBEDTLS_CIPHER_CAMELLIA_128_CBC: *alg = PSA_ALG_CBC_NO_PADDING; *key_type = PSA_KEY_TYPE_CAMELLIA; *key_size = 128; break; case MBEDTLS_CIPHER_CAMELLIA_128_CCM: *alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen) : PSA_ALG_CCM; *key_type = PSA_KEY_TYPE_CAMELLIA; *key_size = 128; break; case MBEDTLS_CIPHER_CAMELLIA_128_GCM: *alg = PSA_ALG_GCM; *key_type = PSA_KEY_TYPE_CAMELLIA; *key_size = 128; break; case MBEDTLS_CIPHER_CAMELLIA_192_CCM: *alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen) : PSA_ALG_CCM; *key_type = PSA_KEY_TYPE_CAMELLIA; *key_size = 192; break; case MBEDTLS_CIPHER_CAMELLIA_192_GCM: *alg = PSA_ALG_GCM; *key_type = PSA_KEY_TYPE_CAMELLIA; *key_size = 192; break; case MBEDTLS_CIPHER_CAMELLIA_256_CBC: *alg = PSA_ALG_CBC_NO_PADDING; *key_type = PSA_KEY_TYPE_CAMELLIA; *key_size = 256; break; case MBEDTLS_CIPHER_CAMELLIA_256_CCM: *alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen) : PSA_ALG_CCM; *key_type = PSA_KEY_TYPE_CAMELLIA; *key_size = 256; break; case MBEDTLS_CIPHER_CAMELLIA_256_GCM: *alg = PSA_ALG_GCM; *key_type = PSA_KEY_TYPE_CAMELLIA; *key_size = 256; break; case MBEDTLS_CIPHER_CHACHA20_POLY1305: *alg = PSA_ALG_CHACHA20_POLY1305; *key_type = PSA_KEY_TYPE_CHACHA20; *key_size = 256; break; case MBEDTLS_CIPHER_NULL: *alg = MBEDTLS_SSL_NULL_CIPHER; *key_type = 0; *key_size = 0; break; default: return PSA_ERROR_NOT_SUPPORTED; } return PSA_SUCCESS; } #endif /* MBEDTLS_USE_PSA_CRYPTO || MBEDTLS_SSL_PROTO_TLS1_3 */ #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) int mbedtls_ssl_conf_dh_param_bin(mbedtls_ssl_config *conf, const unsigned char *dhm_P, size_t P_len, const unsigned char *dhm_G, size_t G_len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); if ((ret = mbedtls_mpi_read_binary(&conf->dhm_P, dhm_P, P_len)) != 0 || (ret = mbedtls_mpi_read_binary(&conf->dhm_G, dhm_G, G_len)) != 0) { mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); return ret; } return 0; } int mbedtls_ssl_conf_dh_param_ctx(mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); if ((ret = mbedtls_dhm_get_value(dhm_ctx, MBEDTLS_DHM_PARAM_P, &conf->dhm_P)) != 0 || (ret = mbedtls_dhm_get_value(dhm_ctx, MBEDTLS_DHM_PARAM_G, &conf->dhm_G)) != 0) { mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); return ret; } return 0; } #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */ #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) /* * Set the minimum length for Diffie-Hellman parameters */ void mbedtls_ssl_conf_dhm_min_bitlen(mbedtls_ssl_config *conf, unsigned int bitlen) { conf->dhm_min_bitlen = bitlen; } #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */ #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) #if !defined(MBEDTLS_DEPRECATED_REMOVED) && defined(MBEDTLS_SSL_PROTO_TLS1_2) /* * Set allowed/preferred hashes for handshake signatures */ void mbedtls_ssl_conf_sig_hashes(mbedtls_ssl_config *conf, const int *hashes) { conf->sig_hashes = hashes; } #endif /* !MBEDTLS_DEPRECATED_REMOVED && MBEDTLS_SSL_PROTO_TLS1_2 */ /* Configure allowed signature algorithms for handshake */ void mbedtls_ssl_conf_sig_algs(mbedtls_ssl_config *conf, const uint16_t *sig_algs) { #if !defined(MBEDTLS_DEPRECATED_REMOVED) conf->sig_hashes = NULL; #endif /* !MBEDTLS_DEPRECATED_REMOVED */ conf->sig_algs = sig_algs; } #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_ECP_C) #if !defined(MBEDTLS_DEPRECATED_REMOVED) /* * Set the allowed elliptic curves * * mbedtls_ssl_setup() takes the provided list * and translates it to a list of IANA TLS group identifiers, * stored in ssl->handshake->group_list. * */ void mbedtls_ssl_conf_curves(mbedtls_ssl_config *conf, const mbedtls_ecp_group_id *curve_list) { conf->curve_list = curve_list; conf->group_list = NULL; } #endif /* MBEDTLS_DEPRECATED_REMOVED */ #endif /* MBEDTLS_ECP_C */ /* * Set the allowed groups */ void mbedtls_ssl_conf_groups(mbedtls_ssl_config *conf, const uint16_t *group_list) { #if defined(MBEDTLS_ECP_C) && !defined(MBEDTLS_DEPRECATED_REMOVED) conf->curve_list = NULL; #endif conf->group_list = group_list; } #if defined(MBEDTLS_X509_CRT_PARSE_C) int mbedtls_ssl_set_hostname(mbedtls_ssl_context *ssl, const char *hostname) { /* Initialize to suppress unnecessary compiler warning */ size_t hostname_len = 0; /* Check if new hostname is valid before * making any change to current one */ if (hostname != NULL) { hostname_len = strlen(hostname); if (hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } } /* Now it's clear that we will overwrite the old hostname, * so we can free it safely */ if (ssl->hostname != NULL) { mbedtls_platform_zeroize(ssl->hostname, strlen(ssl->hostname)); mbedtls_free(ssl->hostname); } /* Passing NULL as hostname shall clear the old one */ if (hostname == NULL) { ssl->hostname = NULL; } else { ssl->hostname = mbedtls_calloc(1, hostname_len + 1); if (ssl->hostname == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(ssl->hostname, hostname, hostname_len); ssl->hostname[hostname_len] = '\0'; } return 0; } #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) void mbedtls_ssl_conf_sni(mbedtls_ssl_config *conf, int (*f_sni)(void *, mbedtls_ssl_context *, const unsigned char *, size_t), void *p_sni) { conf->f_sni = f_sni; conf->p_sni = p_sni; } #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ #if defined(MBEDTLS_SSL_ALPN) int mbedtls_ssl_conf_alpn_protocols(mbedtls_ssl_config *conf, const char **protos) { size_t cur_len, tot_len; const char **p; /* * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings * MUST NOT be truncated." * We check lengths now rather than later. */ tot_len = 0; for (p = protos; *p != NULL; p++) { cur_len = strlen(*p); tot_len += cur_len; if ((cur_len == 0) || (cur_len > MBEDTLS_SSL_MAX_ALPN_NAME_LEN) || (tot_len > MBEDTLS_SSL_MAX_ALPN_LIST_LEN)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } } conf->alpn_list = protos; return 0; } const char *mbedtls_ssl_get_alpn_protocol(const mbedtls_ssl_context *ssl) { return ssl->alpn_chosen; } #endif /* MBEDTLS_SSL_ALPN */ #if defined(MBEDTLS_SSL_DTLS_SRTP) void mbedtls_ssl_conf_srtp_mki_value_supported(mbedtls_ssl_config *conf, int support_mki_value) { conf->dtls_srtp_mki_support = support_mki_value; } int mbedtls_ssl_dtls_srtp_set_mki_value(mbedtls_ssl_context *ssl, unsigned char *mki_value, uint16_t mki_len) { if (mki_len > MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_UNSUPPORTED) { return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } memcpy(ssl->dtls_srtp_info.mki_value, mki_value, mki_len); ssl->dtls_srtp_info.mki_len = mki_len; return 0; } int mbedtls_ssl_conf_dtls_srtp_protection_profiles(mbedtls_ssl_config *conf, const mbedtls_ssl_srtp_profile *profiles) { const mbedtls_ssl_srtp_profile *p; size_t list_size = 0; /* check the profiles list: all entry must be valid, * its size cannot be more than the total number of supported profiles, currently 4 */ for (p = profiles; *p != MBEDTLS_TLS_SRTP_UNSET && list_size <= MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH; p++) { if (mbedtls_ssl_check_srtp_profile_value(*p) != MBEDTLS_TLS_SRTP_UNSET) { list_size++; } else { /* unsupported value, stop parsing and set the size to an error value */ list_size = MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH + 1; } } if (list_size > MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH) { conf->dtls_srtp_profile_list = NULL; conf->dtls_srtp_profile_list_len = 0; return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->dtls_srtp_profile_list = profiles; conf->dtls_srtp_profile_list_len = list_size; return 0; } void mbedtls_ssl_get_dtls_srtp_negotiation_result(const mbedtls_ssl_context *ssl, mbedtls_dtls_srtp_info *dtls_srtp_info) { dtls_srtp_info->chosen_dtls_srtp_profile = ssl->dtls_srtp_info.chosen_dtls_srtp_profile; /* do not copy the mki value if there is no chosen profile */ if (dtls_srtp_info->chosen_dtls_srtp_profile == MBEDTLS_TLS_SRTP_UNSET) { dtls_srtp_info->mki_len = 0; } else { dtls_srtp_info->mki_len = ssl->dtls_srtp_info.mki_len; memcpy(dtls_srtp_info->mki_value, ssl->dtls_srtp_info.mki_value, ssl->dtls_srtp_info.mki_len); } } #endif /* MBEDTLS_SSL_DTLS_SRTP */ #if !defined(MBEDTLS_DEPRECATED_REMOVED) void mbedtls_ssl_conf_max_version(mbedtls_ssl_config *conf, int major, int minor) { conf->max_tls_version = (major << 8) | minor; } void mbedtls_ssl_conf_min_version(mbedtls_ssl_config *conf, int major, int minor) { conf->min_tls_version = (major << 8) | minor; } #endif /* MBEDTLS_DEPRECATED_REMOVED */ #if defined(MBEDTLS_SSL_SRV_C) void mbedtls_ssl_conf_cert_req_ca_list(mbedtls_ssl_config *conf, char cert_req_ca_list) { conf->cert_req_ca_list = cert_req_ca_list; } #endif #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) void mbedtls_ssl_conf_encrypt_then_mac(mbedtls_ssl_config *conf, char etm) { conf->encrypt_then_mac = etm; } #endif #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) void mbedtls_ssl_conf_extended_master_secret(mbedtls_ssl_config *conf, char ems) { conf->extended_ms = ems; } #endif #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) int mbedtls_ssl_conf_max_frag_len(mbedtls_ssl_config *conf, unsigned char mfl_code) { if (mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID || ssl_mfl_code_to_length(mfl_code) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } conf->mfl_code = mfl_code; return 0; } #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ void mbedtls_ssl_conf_legacy_renegotiation(mbedtls_ssl_config *conf, int allow_legacy) { conf->allow_legacy_renegotiation = allow_legacy; } #if defined(MBEDTLS_SSL_RENEGOTIATION) void mbedtls_ssl_conf_renegotiation(mbedtls_ssl_config *conf, int renegotiation) { conf->disable_renegotiation = renegotiation; } void mbedtls_ssl_conf_renegotiation_enforced(mbedtls_ssl_config *conf, int max_records) { conf->renego_max_records = max_records; } void mbedtls_ssl_conf_renegotiation_period(mbedtls_ssl_config *conf, const unsigned char period[8]) { memcpy(conf->renego_period, period, 8); } #endif /* MBEDTLS_SSL_RENEGOTIATION */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) #if defined(MBEDTLS_SSL_CLI_C) void mbedtls_ssl_conf_session_tickets(mbedtls_ssl_config *conf, int use_tickets) { conf->session_tickets = use_tickets; } #endif #if defined(MBEDTLS_SSL_SRV_C) #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && defined(MBEDTLS_SSL_SESSION_TICKETS) void mbedtls_ssl_conf_new_session_tickets(mbedtls_ssl_config *conf, uint16_t num_tickets) { conf->new_session_tickets_count = num_tickets; } #endif void mbedtls_ssl_conf_session_tickets_cb(mbedtls_ssl_config *conf, mbedtls_ssl_ticket_write_t *f_ticket_write, mbedtls_ssl_ticket_parse_t *f_ticket_parse, void *p_ticket) { conf->f_ticket_write = f_ticket_write; conf->f_ticket_parse = f_ticket_parse; conf->p_ticket = p_ticket; } #endif #endif /* MBEDTLS_SSL_SESSION_TICKETS */ void mbedtls_ssl_set_export_keys_cb(mbedtls_ssl_context *ssl, mbedtls_ssl_export_keys_t *f_export_keys, void *p_export_keys) { ssl->f_export_keys = f_export_keys; ssl->p_export_keys = p_export_keys; } #if defined(MBEDTLS_SSL_ASYNC_PRIVATE) void mbedtls_ssl_conf_async_private_cb( mbedtls_ssl_config *conf, mbedtls_ssl_async_sign_t *f_async_sign, mbedtls_ssl_async_decrypt_t *f_async_decrypt, mbedtls_ssl_async_resume_t *f_async_resume, mbedtls_ssl_async_cancel_t *f_async_cancel, void *async_config_data) { conf->f_async_sign_start = f_async_sign; conf->f_async_decrypt_start = f_async_decrypt; conf->f_async_resume = f_async_resume; conf->f_async_cancel = f_async_cancel; conf->p_async_config_data = async_config_data; } void *mbedtls_ssl_conf_get_async_config_data(const mbedtls_ssl_config *conf) { return conf->p_async_config_data; } void *mbedtls_ssl_get_async_operation_data(const mbedtls_ssl_context *ssl) { if (ssl->handshake == NULL) { return NULL; } else { return ssl->handshake->user_async_ctx; } } void mbedtls_ssl_set_async_operation_data(mbedtls_ssl_context *ssl, void *ctx) { if (ssl->handshake != NULL) { ssl->handshake->user_async_ctx = ctx; } } #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ /* * SSL get accessors */ uint32_t mbedtls_ssl_get_verify_result(const mbedtls_ssl_context *ssl) { if (ssl->session != NULL) { return ssl->session->verify_result; } if (ssl->session_negotiate != NULL) { return ssl->session_negotiate->verify_result; } return 0xFFFFFFFF; } int mbedtls_ssl_get_ciphersuite_id_from_ssl(const mbedtls_ssl_context *ssl) { if (ssl == NULL || ssl->session == NULL) { return 0; } return ssl->session->ciphersuite; } const char *mbedtls_ssl_get_ciphersuite(const mbedtls_ssl_context *ssl) { if (ssl == NULL || ssl->session == NULL) { return NULL; } return mbedtls_ssl_get_ciphersuite_name(ssl->session->ciphersuite); } const char *mbedtls_ssl_get_version(const mbedtls_ssl_context *ssl) { #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { switch (ssl->tls_version) { case MBEDTLS_SSL_VERSION_TLS1_2: return "DTLSv1.2"; default: return "unknown (DTLS)"; } } #endif switch (ssl->tls_version) { case MBEDTLS_SSL_VERSION_TLS1_2: return "TLSv1.2"; case MBEDTLS_SSL_VERSION_TLS1_3: return "TLSv1.3"; default: return "unknown"; } } #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) size_t mbedtls_ssl_get_input_max_frag_len(const mbedtls_ssl_context *ssl) { size_t max_len = MBEDTLS_SSL_IN_CONTENT_LEN; size_t read_mfl; #if defined(MBEDTLS_SSL_PROTO_TLS1_2) /* Use the configured MFL for the client if we're past SERVER_HELLO_DONE */ if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && ssl->state >= MBEDTLS_SSL_SERVER_HELLO_DONE) { return ssl_mfl_code_to_length(ssl->conf->mfl_code); } #endif /* Check if a smaller max length was negotiated */ if (ssl->session_out != NULL) { read_mfl = ssl_mfl_code_to_length(ssl->session_out->mfl_code); if (read_mfl < max_len) { max_len = read_mfl; } } /* During a handshake, use the value being negotiated */ if (ssl->session_negotiate != NULL) { read_mfl = ssl_mfl_code_to_length(ssl->session_negotiate->mfl_code); if (read_mfl < max_len) { max_len = read_mfl; } } return max_len; } size_t mbedtls_ssl_get_output_max_frag_len(const mbedtls_ssl_context *ssl) { size_t max_len; /* * Assume mfl_code is correct since it was checked when set */ max_len = ssl_mfl_code_to_length(ssl->conf->mfl_code); /* Check if a smaller max length was negotiated */ if (ssl->session_out != NULL && ssl_mfl_code_to_length(ssl->session_out->mfl_code) < max_len) { max_len = ssl_mfl_code_to_length(ssl->session_out->mfl_code); } /* During a handshake, use the value being negotiated */ if (ssl->session_negotiate != NULL && ssl_mfl_code_to_length(ssl->session_negotiate->mfl_code) < max_len) { max_len = ssl_mfl_code_to_length(ssl->session_negotiate->mfl_code); } return max_len; } #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ #if defined(MBEDTLS_SSL_PROTO_DTLS) size_t mbedtls_ssl_get_current_mtu(const mbedtls_ssl_context *ssl) { /* Return unlimited mtu for client hello messages to avoid fragmentation. */ if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && (ssl->state == MBEDTLS_SSL_CLIENT_HELLO || ssl->state == MBEDTLS_SSL_SERVER_HELLO)) { return 0; } if (ssl->handshake == NULL || ssl->handshake->mtu == 0) { return ssl->mtu; } if (ssl->mtu == 0) { return ssl->handshake->mtu; } return ssl->mtu < ssl->handshake->mtu ? ssl->mtu : ssl->handshake->mtu; } #endif /* MBEDTLS_SSL_PROTO_DTLS */ int mbedtls_ssl_get_max_out_record_payload(const mbedtls_ssl_context *ssl) { size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN; #if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ !defined(MBEDTLS_SSL_PROTO_DTLS) (void) ssl; #endif #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) const size_t mfl = mbedtls_ssl_get_output_max_frag_len(ssl); if (max_len > mfl) { max_len = mfl; } #endif #if defined(MBEDTLS_SSL_PROTO_DTLS) if (mbedtls_ssl_get_current_mtu(ssl) != 0) { const size_t mtu = mbedtls_ssl_get_current_mtu(ssl); const int ret = mbedtls_ssl_get_record_expansion(ssl); const size_t overhead = (size_t) ret; if (ret < 0) { return ret; } if (mtu <= overhead) { MBEDTLS_SSL_DEBUG_MSG(1, ("MTU too low for record expansion")); return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } if (max_len > mtu - overhead) { max_len = mtu - overhead; } } #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ !defined(MBEDTLS_SSL_PROTO_DTLS) ((void) ssl); #endif return (int) max_len; } int mbedtls_ssl_get_max_in_record_payload(const mbedtls_ssl_context *ssl) { size_t max_len = MBEDTLS_SSL_IN_CONTENT_LEN; #if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) (void) ssl; #endif #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) const size_t mfl = mbedtls_ssl_get_input_max_frag_len(ssl); if (max_len > mfl) { max_len = mfl; } #endif return (int) max_len; } #if defined(MBEDTLS_X509_CRT_PARSE_C) const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert(const mbedtls_ssl_context *ssl) { if (ssl == NULL || ssl->session == NULL) { return NULL; } #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) return ssl->session->peer_cert; #else return NULL; #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ } #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_CLI_C) int mbedtls_ssl_get_session(const mbedtls_ssl_context *ssl, mbedtls_ssl_session *dst) { int ret; if (ssl == NULL || dst == NULL || ssl->session == NULL || ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Since Mbed TLS 3.0, mbedtls_ssl_get_session() is no longer * idempotent: Each session can only be exported once. * * (This is in preparation for TLS 1.3 support where we will * need the ability to export multiple sessions (aka tickets), * which will be achieved by calling mbedtls_ssl_get_session() * multiple times until it fails.) * * Check whether we have already exported the current session, * and fail if so. */ if (ssl->session->exported == 1) { return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } ret = mbedtls_ssl_session_copy(dst, ssl->session); if (ret != 0) { return ret; } /* Remember that we've exported the session. */ ssl->session->exported = 1; return 0; } #endif /* MBEDTLS_SSL_CLI_C */ /* * Define ticket header determining Mbed TLS version * and structure of the ticket. */ /* * Define bitflag determining compile-time settings influencing * structure of serialized SSL sessions. */ #if defined(MBEDTLS_HAVE_TIME) #define SSL_SERIALIZED_SESSION_CONFIG_TIME 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_TIME 0 #endif /* MBEDTLS_HAVE_TIME */ #if defined(MBEDTLS_X509_CRT_PARSE_C) #define SSL_SERIALIZED_SESSION_CONFIG_CRT 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_CRT 0 #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_CLI_C) && defined(MBEDTLS_SSL_SESSION_TICKETS) #define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 0 #endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_SESSION_TICKETS */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) #define SSL_SERIALIZED_SESSION_CONFIG_MFL 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_MFL 0 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) #define SSL_SERIALIZED_SESSION_CONFIG_ETM 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_ETM 0 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) #define SSL_SERIALIZED_SESSION_CONFIG_TICKET 1 #else #define SSL_SERIALIZED_SESSION_CONFIG_TICKET 0 #endif /* MBEDTLS_SSL_SESSION_TICKETS */ #define SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT 0 #define SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT 1 #define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT 2 #define SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT 3 #define SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT 4 #define SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT 5 #define SSL_SERIALIZED_SESSION_CONFIG_BITFLAG \ ((uint16_t) ( \ (SSL_SERIALIZED_SESSION_CONFIG_TIME << SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_CRT << SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET << \ SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_MFL << SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_ETM << SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT) | \ (SSL_SERIALIZED_SESSION_CONFIG_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT))) static unsigned char ssl_serialized_session_header[] = { MBEDTLS_VERSION_MAJOR, MBEDTLS_VERSION_MINOR, MBEDTLS_VERSION_PATCH, MBEDTLS_BYTE_1(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG), MBEDTLS_BYTE_0(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG), }; /* * Serialize a session in the following format: * (in the presentation language of TLS, RFC 8446 section 3) * * struct { * * opaque mbedtls_version[3]; // library version: major, minor, patch * opaque session_format[2]; // library-version specific 16-bit field * // determining the format of the remaining * // serialized data. * * Note: When updating the format, remember to keep * these version+format bytes. * * // In this version, `session_format` determines * // the setting of those compile-time * // configuration options which influence * // the structure of mbedtls_ssl_session. * * uint8_t minor_ver; // Protocol minor version. Possible values: * // - TLS 1.2 (0x0303) * // - TLS 1.3 (0x0304) * * select (serialized_session.tls_version) { * * case MBEDTLS_SSL_VERSION_TLS1_2: * serialized_session_tls12 data; * case MBEDTLS_SSL_VERSION_TLS1_3: * serialized_session_tls13 data; * * }; * * } serialized_session; * */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_session_save(const mbedtls_ssl_session *session, unsigned char omit_header, unsigned char *buf, size_t buf_len, size_t *olen) { unsigned char *p = buf; size_t used = 0; size_t remaining_len; #if defined(MBEDTLS_SSL_PROTO_TLS1_3) size_t out_len; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #endif if (session == NULL) { return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } if (!omit_header) { /* * Add Mbed TLS version identifier */ used += sizeof(ssl_serialized_session_header); if (used <= buf_len) { memcpy(p, ssl_serialized_session_header, sizeof(ssl_serialized_session_header)); p += sizeof(ssl_serialized_session_header); } } /* * TLS version identifier */ used += 1; if (used <= buf_len) { *p++ = MBEDTLS_BYTE_0(session->tls_version); } /* Forward to version-specific serialization routine. */ remaining_len = (buf_len >= used) ? buf_len - used : 0; switch (session->tls_version) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) case MBEDTLS_SSL_VERSION_TLS1_2: used += ssl_tls12_session_save(session, p, remaining_len); break; #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_3) case MBEDTLS_SSL_VERSION_TLS1_3: ret = ssl_tls13_session_save(session, p, remaining_len, &out_len); if (ret != 0 && ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL) { return ret; } used += out_len; break; #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ default: return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; } *olen = used; if (used > buf_len) { return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL; } return 0; } /* * Public wrapper for ssl_session_save() */ int mbedtls_ssl_session_save(const mbedtls_ssl_session *session, unsigned char *buf, size_t buf_len, size_t *olen) { return ssl_session_save(session, 0, buf, buf_len, olen); } /* * Deserialize session, see mbedtls_ssl_session_save() for format. * * This internal version is wrapped by a public function that cleans up in * case of error, and has an extra option omit_header. */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_session_load(mbedtls_ssl_session *session, unsigned char omit_header, const unsigned char *buf, size_t len) { const unsigned char *p = buf; const unsigned char * const end = buf + len; size_t remaining_len; if (session == NULL) { return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } if (!omit_header) { /* * Check Mbed TLS version identifier */ if ((size_t) (end - p) < sizeof(ssl_serialized_session_header)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (memcmp(p, ssl_serialized_session_header, sizeof(ssl_serialized_session_header)) != 0) { return MBEDTLS_ERR_SSL_VERSION_MISMATCH; } p += sizeof(ssl_serialized_session_header); } /* * TLS version identifier */ if (1 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->tls_version = 0x0300 | *p++; /* Dispatch according to TLS version. */ remaining_len = (end - p); switch (session->tls_version) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) case MBEDTLS_SSL_VERSION_TLS1_2: return ssl_tls12_session_load(session, p, remaining_len); #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_3) case MBEDTLS_SSL_VERSION_TLS1_3: return ssl_tls13_session_load(session, p, remaining_len); #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ default: return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } } /* * Deserialize session: public wrapper for error cleaning */ int mbedtls_ssl_session_load(mbedtls_ssl_session *session, const unsigned char *buf, size_t len) { int ret = ssl_session_load(session, 0, buf, len); if (ret != 0) { mbedtls_ssl_session_free(session); } return ret; } /* * Perform a single step of the SSL handshake */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_prepare_handshake_step(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* * We may have not been able to send to the peer all the handshake data * that were written into the output buffer by the previous handshake step, * if the write to the network callback returned with the * #MBEDTLS_ERR_SSL_WANT_WRITE error code. * We proceed to the next handshake step only when all data from the * previous one have been sent to the peer, thus we make sure that this is * the case here by calling `mbedtls_ssl_flush_output()`. The function may * return with the #MBEDTLS_ERR_SSL_WANT_WRITE error code in which case * we have to wait before to go ahead. * In the case of TLS 1.3, handshake step handlers do not send data to the * peer. Data are only sent here and through * `mbedtls_ssl_handle_pending_alert` in case an error that triggered an * alert occurred. */ if ((ret = mbedtls_ssl_flush_output(ssl)) != 0) { return ret; } #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING) { if ((ret = mbedtls_ssl_flight_transmit(ssl)) != 0) { return ret; } } #endif /* MBEDTLS_SSL_PROTO_DTLS */ return ret; } int mbedtls_ssl_handshake_step(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; if (ssl == NULL || ssl->conf == NULL || ssl->handshake == NULL || ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ret = ssl_prepare_handshake_step(ssl); if (ret != 0) { return ret; } ret = mbedtls_ssl_handle_pending_alert(ssl); if (ret != 0) { goto cleanup; } /* If ssl->conf->endpoint is not one of MBEDTLS_SSL_IS_CLIENT or * MBEDTLS_SSL_IS_SERVER, this is the return code we give */ ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA; #if defined(MBEDTLS_SSL_CLI_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { MBEDTLS_SSL_DEBUG_MSG(2, ("client state: %s", mbedtls_ssl_states_str(ssl->state))); switch (ssl->state) { case MBEDTLS_SSL_HELLO_REQUEST: ssl->state = MBEDTLS_SSL_CLIENT_HELLO; ret = 0; break; case MBEDTLS_SSL_CLIENT_HELLO: ret = mbedtls_ssl_write_client_hello(ssl); break; default: #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && defined(MBEDTLS_SSL_PROTO_TLS1_3) if (ssl->tls_version == MBEDTLS_SSL_VERSION_TLS1_3) { ret = mbedtls_ssl_tls13_handshake_client_step(ssl); } else { ret = mbedtls_ssl_handshake_client_step(ssl); } #elif defined(MBEDTLS_SSL_PROTO_TLS1_2) ret = mbedtls_ssl_handshake_client_step(ssl); #else ret = mbedtls_ssl_tls13_handshake_client_step(ssl); #endif } } #endif #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { #if defined(MBEDTLS_SSL_PROTO_TLS1_3) if (mbedtls_ssl_conf_is_tls13_only(ssl->conf)) { ret = mbedtls_ssl_tls13_handshake_server_step(ssl); } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (mbedtls_ssl_conf_is_tls12_only(ssl->conf)) { ret = mbedtls_ssl_handshake_server_step(ssl); } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ } #endif if (ret != 0) { /* handshake_step return error. And it is same * with alert_reason. */ if (ssl->send_alert) { ret = mbedtls_ssl_handle_pending_alert(ssl); goto cleanup; } } cleanup: return ret; } /* * Perform the SSL handshake */ int mbedtls_ssl_handshake(mbedtls_ssl_context *ssl) { int ret = 0; /* Sanity checks */ if (ssl == NULL || ssl->conf == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && (ssl->f_set_timer == NULL || ssl->f_get_timer == NULL)) { MBEDTLS_SSL_DEBUG_MSG(1, ("You must use " "mbedtls_ssl_set_timer_cb() for DTLS")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #endif /* MBEDTLS_SSL_PROTO_DTLS */ MBEDTLS_SSL_DEBUG_MSG(2, ("=> handshake")); /* Main handshake loop */ while (ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) { ret = mbedtls_ssl_handshake_step(ssl); if (ret != 0) { break; } } MBEDTLS_SSL_DEBUG_MSG(2, ("<= handshake")); return ret; } #if defined(MBEDTLS_SSL_RENEGOTIATION) #if defined(MBEDTLS_SSL_SRV_C) /* * Write HelloRequest to request renegotiation on server */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_write_hello_request(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; MBEDTLS_SSL_DEBUG_MSG(2, ("=> write hello request")); ssl->out_msglen = 4; ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST; if ((ret = mbedtls_ssl_write_handshake_msg(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_write_handshake_msg", ret); return ret; } MBEDTLS_SSL_DEBUG_MSG(2, ("<= write hello request")); return 0; } #endif /* MBEDTLS_SSL_SRV_C */ /* * Actually renegotiate current connection, triggered by either: * - any side: calling mbedtls_ssl_renegotiate(), * - client: receiving a HelloRequest during mbedtls_ssl_read(), * - server: receiving any handshake message on server during mbedtls_ssl_read() after * the initial handshake is completed. * If the handshake doesn't complete due to waiting for I/O, it will continue * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively. */ int mbedtls_ssl_start_renegotiation(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; MBEDTLS_SSL_DEBUG_MSG(2, ("=> renegotiate")); if ((ret = ssl_handshake_init(ssl)) != 0) { return ret; } /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and * the ServerHello will have message_seq = 1" */ #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING) { if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { ssl->handshake->out_msg_seq = 1; } else { ssl->handshake->in_msg_seq = 1; } } #endif ssl->state = MBEDTLS_SSL_HELLO_REQUEST; ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS; if ((ret = mbedtls_ssl_handshake(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_handshake", ret); return ret; } MBEDTLS_SSL_DEBUG_MSG(2, ("<= renegotiate")); return 0; } /* * Renegotiate current connection on client, * or request renegotiation on server */ int mbedtls_ssl_renegotiate(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; if (ssl == NULL || ssl->conf == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #if defined(MBEDTLS_SSL_SRV_C) /* On server, just send the request */ if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { if (mbedtls_ssl_is_handshake_over(ssl) == 0) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING; /* Did we already try/start sending HelloRequest? */ if (ssl->out_left != 0) { return mbedtls_ssl_flush_output(ssl); } return ssl_write_hello_request(ssl); } #endif /* MBEDTLS_SSL_SRV_C */ #if defined(MBEDTLS_SSL_CLI_C) /* * On client, either start the renegotiation process or, * if already in progress, continue the handshake */ if (ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) { if (mbedtls_ssl_is_handshake_over(ssl) == 0) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if ((ret = mbedtls_ssl_start_renegotiation(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_start_renegotiation", ret); return ret; } } else { if ((ret = mbedtls_ssl_handshake(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_handshake", ret); return ret; } } #endif /* MBEDTLS_SSL_CLI_C */ return ret; } #endif /* MBEDTLS_SSL_RENEGOTIATION */ void mbedtls_ssl_handshake_free(mbedtls_ssl_context *ssl) { mbedtls_ssl_handshake_params *handshake = ssl->handshake; if (handshake == NULL) { return; } #if defined(MBEDTLS_ECP_C) #if !defined(MBEDTLS_DEPRECATED_REMOVED) if (ssl->handshake->group_list_heap_allocated) { mbedtls_free((void *) handshake->group_list); } handshake->group_list = NULL; #endif /* MBEDTLS_DEPRECATED_REMOVED */ #endif /* MBEDTLS_ECP_C */ #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) #if !defined(MBEDTLS_DEPRECATED_REMOVED) if (ssl->handshake->sig_algs_heap_allocated) { mbedtls_free((void *) handshake->sig_algs); } handshake->sig_algs = NULL; #endif /* MBEDTLS_DEPRECATED_REMOVED */ #if defined(MBEDTLS_SSL_PROTO_TLS1_3) if (ssl->handshake->certificate_request_context) { mbedtls_free((void *) handshake->certificate_request_context); } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_SSL_ASYNC_PRIVATE) if (ssl->conf->f_async_cancel != NULL && handshake->async_in_progress != 0) { ssl->conf->f_async_cancel(ssl); handshake->async_in_progress = 0; } #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ #if defined(MBEDTLS_MD_CAN_SHA256) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort(&handshake->fin_sha256_psa); #else mbedtls_md_free(&handshake->fin_sha256); #endif #endif #if defined(MBEDTLS_MD_CAN_SHA384) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort(&handshake->fin_sha384_psa); #else mbedtls_md_free(&handshake->fin_sha384); #endif #endif #if defined(MBEDTLS_DHM_C) mbedtls_dhm_free(&handshake->dhm_ctx); #endif #if !defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_ECDH_C) mbedtls_ecdh_free(&handshake->ecdh_ctx); #endif #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_pake_abort(&handshake->psa_pake_ctx); /* * Opaque keys are not stored in the handshake's data and it's the user * responsibility to destroy them. Clear ones, instead, are created by * the TLS library and should be destroyed at the same level */ if (!mbedtls_svc_key_id_is_null(handshake->psa_pake_password)) { psa_destroy_key(handshake->psa_pake_password); } handshake->psa_pake_password = MBEDTLS_SVC_KEY_ID_INIT; #else mbedtls_ecjpake_free(&handshake->ecjpake_ctx); #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_SSL_CLI_C) mbedtls_free(handshake->ecjpake_cache); handshake->ecjpake_cache = NULL; handshake->ecjpake_cache_len = 0; #endif #endif #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) /* explicit void pointer cast for buggy MS compiler */ mbedtls_free((void *) handshake->curves_tls_id); #endif #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED) #if defined(MBEDTLS_USE_PSA_CRYPTO) if (!mbedtls_svc_key_id_is_null(ssl->handshake->psk_opaque)) { /* The maintenance of the external PSK key slot is the * user's responsibility. */ if (ssl->handshake->psk_opaque_is_internal) { psa_destroy_key(ssl->handshake->psk_opaque); ssl->handshake->psk_opaque_is_internal = 0; } ssl->handshake->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT; } #else if (handshake->psk != NULL) { mbedtls_platform_zeroize(handshake->psk, handshake->psk_len); mbedtls_free(handshake->psk); } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED */ #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) /* * Free only the linked list wrapper, not the keys themselves * since the belong to the SNI callback */ ssl_key_cert_free(handshake->sni_key_cert); #endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */ #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) mbedtls_x509_crt_restart_free(&handshake->ecrs_ctx); if (handshake->ecrs_peer_cert != NULL) { mbedtls_x509_crt_free(handshake->ecrs_peer_cert); mbedtls_free(handshake->ecrs_peer_cert); } #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) && \ !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) mbedtls_pk_free(&handshake->peer_pubkey); #endif /* MBEDTLS_X509_CRT_PARSE_C && !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #if defined(MBEDTLS_SSL_CLI_C) && \ (defined(MBEDTLS_SSL_PROTO_DTLS) || defined(MBEDTLS_SSL_PROTO_TLS1_3)) mbedtls_free(handshake->cookie); #endif /* MBEDTLS_SSL_CLI_C && ( MBEDTLS_SSL_PROTO_DTLS || MBEDTLS_SSL_PROTO_TLS1_3 ) */ #if defined(MBEDTLS_SSL_PROTO_DTLS) mbedtls_ssl_flight_free(handshake->flight); mbedtls_ssl_buffering_free(ssl); #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if defined(PSA_WANT_ALG_ECDH) && \ (defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3)) if (handshake->ecdh_psa_privkey_is_external == 0) { psa_destroy_key(handshake->ecdh_psa_privkey); } #endif /* PSA_WANT_ALG_ECDH && (MBEDTLS_USE_PSA_CRYPTO || MBEDTLS_SSL_PROTO_TLS1_3) */ #if defined(MBEDTLS_SSL_PROTO_TLS1_3) mbedtls_ssl_transform_free(handshake->transform_handshake); mbedtls_free(handshake->transform_handshake); #if defined(MBEDTLS_SSL_EARLY_DATA) mbedtls_ssl_transform_free(handshake->transform_earlydata); mbedtls_free(handshake->transform_earlydata); #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) /* If the buffers are too big - reallocate. Because of the way Mbed TLS * processes datagrams and the fact that a datagram is allowed to have * several records in it, it is possible that the I/O buffers are not * empty at this stage */ handle_buffer_resizing(ssl, 1, mbedtls_ssl_get_input_buflen(ssl), mbedtls_ssl_get_output_buflen(ssl)); #endif /* mbedtls_platform_zeroize MUST be last one in this function */ mbedtls_platform_zeroize(handshake, sizeof(mbedtls_ssl_handshake_params)); } void mbedtls_ssl_session_free(mbedtls_ssl_session *session) { if (session == NULL) { return; } #if defined(MBEDTLS_X509_CRT_PARSE_C) ssl_clear_peer_cert(session); #endif #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && \ defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) mbedtls_free(session->hostname); #endif mbedtls_free(session->ticket); #endif mbedtls_platform_zeroize(session, sizeof(mbedtls_ssl_session)); } #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 1u #else #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 0u #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 1u #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 1u #else #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 0u #endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ #if defined(MBEDTLS_SSL_ALPN) #define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 1u #else #define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 0u #endif /* MBEDTLS_SSL_ALPN */ #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT 0 #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT 1 #define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT 2 #define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT 3 #define SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG \ ((uint32_t) ( \ (SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID << \ SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT) | \ (SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT << \ SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT) | \ (SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY << \ SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT) | \ (SSL_SERIALIZED_CONTEXT_CONFIG_ALPN << SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT) | \ 0u)) static unsigned char ssl_serialized_context_header[] = { MBEDTLS_VERSION_MAJOR, MBEDTLS_VERSION_MINOR, MBEDTLS_VERSION_PATCH, MBEDTLS_BYTE_1(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG), MBEDTLS_BYTE_0(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG), MBEDTLS_BYTE_2(SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG), MBEDTLS_BYTE_1(SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG), MBEDTLS_BYTE_0(SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG), }; /* * Serialize a full SSL context * * The format of the serialized data is: * (in the presentation language of TLS, RFC 8446 section 3) * * // header * opaque mbedtls_version[3]; // major, minor, patch * opaque context_format[5]; // version-specific field determining * // the format of the remaining * // serialized data. * Note: When updating the format, remember to keep these * version+format bytes. (We may make their size part of the API.) * * // session sub-structure * opaque session<1..2^32-1>; // see mbedtls_ssl_session_save() * // transform sub-structure * uint8 random[64]; // ServerHello.random+ClientHello.random * uint8 in_cid<0..2^8-1> // Connection ID: expected incoming value * uint8 out_cid<0..2^8-1> // Connection ID: outgoing value to use * // fields from ssl_context * uint32 badmac_seen; // DTLS: number of records with failing MAC * uint64 in_window_top; // DTLS: last validated record seq_num * uint64 in_window; // DTLS: bitmask for replay protection * uint8 disable_datagram_packing; // DTLS: only one record per datagram * uint64 cur_out_ctr; // Record layer: outgoing sequence number * uint16 mtu; // DTLS: path mtu (max outgoing fragment size) * uint8 alpn_chosen<0..2^8-1> // ALPN: negotiated application protocol * * Note that many fields of the ssl_context or sub-structures are not * serialized, as they fall in one of the following categories: * * 1. forced value (eg in_left must be 0) * 2. pointer to dynamically-allocated memory (eg session, transform) * 3. value can be re-derived from other data (eg session keys from MS) * 4. value was temporary (eg content of input buffer) * 5. value will be provided by the user again (eg I/O callbacks and context) */ int mbedtls_ssl_context_save(mbedtls_ssl_context *ssl, unsigned char *buf, size_t buf_len, size_t *olen) { unsigned char *p = buf; size_t used = 0; size_t session_len; int ret = 0; /* * Enforce usage restrictions, see "return BAD_INPUT_DATA" in * this function's documentation. * * These are due to assumptions/limitations in the implementation. Some of * them are likely to stay (no handshake in progress) some might go away * (only DTLS) but are currently used to simplify the implementation. */ /* The initial handshake must be over */ if (mbedtls_ssl_is_handshake_over(ssl) == 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("Initial handshake isn't over")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->handshake != NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("Handshake isn't completed")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Double-check that sub-structures are indeed ready */ if (ssl->transform == NULL || ssl->session == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("Serialised structures aren't ready")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* There must be no pending incoming or outgoing data */ if (mbedtls_ssl_check_pending(ssl) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("There is pending incoming data")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (ssl->out_left != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("There is pending outgoing data")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Protocol must be DTLS, not TLS */ if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) { MBEDTLS_SSL_DEBUG_MSG(1, ("Only DTLS is supported")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Version must be 1.2 */ if (ssl->tls_version != MBEDTLS_SSL_VERSION_TLS1_2) { MBEDTLS_SSL_DEBUG_MSG(1, ("Only version 1.2 supported")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* We must be using an AEAD ciphersuite */ if (mbedtls_ssl_transform_uses_aead(ssl->transform) != 1) { MBEDTLS_SSL_DEBUG_MSG(1, ("Only AEAD ciphersuites supported")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Renegotiation must not be enabled */ #if defined(MBEDTLS_SSL_RENEGOTIATION) if (ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED) { MBEDTLS_SSL_DEBUG_MSG(1, ("Renegotiation must not be enabled")); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #endif /* * Version and format identifier */ used += sizeof(ssl_serialized_context_header); if (used <= buf_len) { memcpy(p, ssl_serialized_context_header, sizeof(ssl_serialized_context_header)); p += sizeof(ssl_serialized_context_header); } /* * Session (length + data) */ ret = ssl_session_save(ssl->session, 1, NULL, 0, &session_len); if (ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL) { return ret; } used += 4 + session_len; if (used <= buf_len) { MBEDTLS_PUT_UINT32_BE(session_len, p, 0); p += 4; ret = ssl_session_save(ssl->session, 1, p, session_len, &session_len); if (ret != 0) { return ret; } p += session_len; } /* * Transform */ used += sizeof(ssl->transform->randbytes); if (used <= buf_len) { memcpy(p, ssl->transform->randbytes, sizeof(ssl->transform->randbytes)); p += sizeof(ssl->transform->randbytes); } #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) used += 2 + ssl->transform->in_cid_len + ssl->transform->out_cid_len; if (used <= buf_len) { *p++ = ssl->transform->in_cid_len; memcpy(p, ssl->transform->in_cid, ssl->transform->in_cid_len); p += ssl->transform->in_cid_len; *p++ = ssl->transform->out_cid_len; memcpy(p, ssl->transform->out_cid, ssl->transform->out_cid_len); p += ssl->transform->out_cid_len; } #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ /* * Saved fields from top-level ssl_context structure */ used += 4; if (used <= buf_len) { MBEDTLS_PUT_UINT32_BE(ssl->badmac_seen, p, 0); p += 4; } #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) used += 16; if (used <= buf_len) { MBEDTLS_PUT_UINT64_BE(ssl->in_window_top, p, 0); p += 8; MBEDTLS_PUT_UINT64_BE(ssl->in_window, p, 0); p += 8; } #endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ #if defined(MBEDTLS_SSL_PROTO_DTLS) used += 1; if (used <= buf_len) { *p++ = ssl->disable_datagram_packing; } #endif /* MBEDTLS_SSL_PROTO_DTLS */ used += MBEDTLS_SSL_SEQUENCE_NUMBER_LEN; if (used <= buf_len) { memcpy(p, ssl->cur_out_ctr, MBEDTLS_SSL_SEQUENCE_NUMBER_LEN); p += MBEDTLS_SSL_SEQUENCE_NUMBER_LEN; } #if defined(MBEDTLS_SSL_PROTO_DTLS) used += 2; if (used <= buf_len) { MBEDTLS_PUT_UINT16_BE(ssl->mtu, p, 0); p += 2; } #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if defined(MBEDTLS_SSL_ALPN) { const uint8_t alpn_len = ssl->alpn_chosen ? (uint8_t) strlen(ssl->alpn_chosen) : 0; used += 1 + alpn_len; if (used <= buf_len) { *p++ = alpn_len; if (ssl->alpn_chosen != NULL) { memcpy(p, ssl->alpn_chosen, alpn_len); p += alpn_len; } } } #endif /* MBEDTLS_SSL_ALPN */ /* * Done */ *olen = used; if (used > buf_len) { return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL; } MBEDTLS_SSL_DEBUG_BUF(4, "saved context", buf, used); return mbedtls_ssl_session_reset_int(ssl, 0); } /* * Deserialize context, see mbedtls_ssl_context_save() for format. * * This internal version is wrapped by a public function that cleans up in * case of error. */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_context_load(mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len) { const unsigned char *p = buf; const unsigned char * const end = buf + len; size_t session_len; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #if defined(MBEDTLS_SSL_PROTO_TLS1_2) tls_prf_fn prf_func = NULL; #endif /* * The context should have been freshly setup or reset. * Give the user an error in case of obvious misuse. * (Checking session is useful because it won't be NULL if we're * renegotiating, or if the user mistakenly loaded a session first.) */ if (ssl->state != MBEDTLS_SSL_HELLO_REQUEST || ssl->session != NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* * We can't check that the config matches the initial one, but we can at * least check it matches the requirements for serializing. */ if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || ssl->conf->max_tls_version < MBEDTLS_SSL_VERSION_TLS1_2 || ssl->conf->min_tls_version > MBEDTLS_SSL_VERSION_TLS1_2 || #if defined(MBEDTLS_SSL_RENEGOTIATION) ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED || #endif 0) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } MBEDTLS_SSL_DEBUG_BUF(4, "context to load", buf, len); /* * Check version identifier */ if ((size_t) (end - p) < sizeof(ssl_serialized_context_header)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (memcmp(p, ssl_serialized_context_header, sizeof(ssl_serialized_context_header)) != 0) { return MBEDTLS_ERR_SSL_VERSION_MISMATCH; } p += sizeof(ssl_serialized_context_header); /* * Session */ if ((size_t) (end - p) < 4) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session_len = ((size_t) p[0] << 24) | ((size_t) p[1] << 16) | ((size_t) p[2] << 8) | ((size_t) p[3]); p += 4; /* This has been allocated by ssl_handshake_init(), called by * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */ ssl->session = ssl->session_negotiate; ssl->session_in = ssl->session; ssl->session_out = ssl->session; ssl->session_negotiate = NULL; if ((size_t) (end - p) < session_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ret = ssl_session_load(ssl->session, 1, p, session_len); if (ret != 0) { mbedtls_ssl_session_free(ssl->session); return ret; } p += session_len; /* * Transform */ /* This has been allocated by ssl_handshake_init(), called by * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) ssl->transform = ssl->transform_negotiate; ssl->transform_in = ssl->transform; ssl->transform_out = ssl->transform; ssl->transform_negotiate = NULL; #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) prf_func = ssl_tls12prf_from_cs(ssl->session->ciphersuite); if (prf_func == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } /* Read random bytes and populate structure */ if ((size_t) (end - p) < sizeof(ssl->transform->randbytes)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ret = ssl_tls12_populate_transform(ssl->transform, ssl->session->ciphersuite, ssl->session->master, #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) ssl->session->encrypt_then_mac, #endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */ prf_func, p, /* currently pointing to randbytes */ MBEDTLS_SSL_VERSION_TLS1_2, /* (D)TLS 1.2 is forced */ ssl->conf->endpoint, ssl); if (ret != 0) { return ret; } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ p += sizeof(ssl->transform->randbytes); #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) /* Read connection IDs and store them */ if ((size_t) (end - p) < 1) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->transform->in_cid_len = *p++; if ((size_t) (end - p) < ssl->transform->in_cid_len + 1u) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(ssl->transform->in_cid, p, ssl->transform->in_cid_len); p += ssl->transform->in_cid_len; ssl->transform->out_cid_len = *p++; if ((size_t) (end - p) < ssl->transform->out_cid_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(ssl->transform->out_cid, p, ssl->transform->out_cid_len); p += ssl->transform->out_cid_len; #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ /* * Saved fields from top-level ssl_context structure */ if ((size_t) (end - p) < 4) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->badmac_seen = ((uint32_t) p[0] << 24) | ((uint32_t) p[1] << 16) | ((uint32_t) p[2] << 8) | ((uint32_t) p[3]); p += 4; #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) if ((size_t) (end - p) < 16) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->in_window_top = ((uint64_t) p[0] << 56) | ((uint64_t) p[1] << 48) | ((uint64_t) p[2] << 40) | ((uint64_t) p[3] << 32) | ((uint64_t) p[4] << 24) | ((uint64_t) p[5] << 16) | ((uint64_t) p[6] << 8) | ((uint64_t) p[7]); p += 8; ssl->in_window = ((uint64_t) p[0] << 56) | ((uint64_t) p[1] << 48) | ((uint64_t) p[2] << 40) | ((uint64_t) p[3] << 32) | ((uint64_t) p[4] << 24) | ((uint64_t) p[5] << 16) | ((uint64_t) p[6] << 8) | ((uint64_t) p[7]); p += 8; #endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ #if defined(MBEDTLS_SSL_PROTO_DTLS) if ((size_t) (end - p) < 1) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->disable_datagram_packing = *p++; #endif /* MBEDTLS_SSL_PROTO_DTLS */ if ((size_t) (end - p) < sizeof(ssl->cur_out_ctr)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(ssl->cur_out_ctr, p, sizeof(ssl->cur_out_ctr)); p += sizeof(ssl->cur_out_ctr); #if defined(MBEDTLS_SSL_PROTO_DTLS) if ((size_t) (end - p) < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl->mtu = (p[0] << 8) | p[1]; p += 2; #endif /* MBEDTLS_SSL_PROTO_DTLS */ #if defined(MBEDTLS_SSL_ALPN) { uint8_t alpn_len; const char **cur; if ((size_t) (end - p) < 1) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } alpn_len = *p++; if (alpn_len != 0 && ssl->conf->alpn_list != NULL) { /* alpn_chosen should point to an item in the configured list */ for (cur = ssl->conf->alpn_list; *cur != NULL; cur++) { if (strlen(*cur) == alpn_len && memcmp(p, cur, alpn_len) == 0) { ssl->alpn_chosen = *cur; break; } } } /* can only happen on conf mismatch */ if (alpn_len != 0 && ssl->alpn_chosen == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } p += alpn_len; } #endif /* MBEDTLS_SSL_ALPN */ /* * Forced fields from top-level ssl_context structure * * Most of them already set to the correct value by mbedtls_ssl_init() and * mbedtls_ssl_reset(), so we only need to set the remaining ones. */ ssl->state = MBEDTLS_SSL_HANDSHAKE_OVER; ssl->tls_version = MBEDTLS_SSL_VERSION_TLS1_2; /* Adjust pointers for header fields of outgoing records to * the given transform, accounting for explicit IV and CID. */ mbedtls_ssl_update_out_pointers(ssl, ssl->transform); #if defined(MBEDTLS_SSL_PROTO_DTLS) ssl->in_epoch = 1; #endif /* mbedtls_ssl_reset() leaves the handshake sub-structure allocated, * which we don't want - otherwise we'd end up freeing the wrong transform * by calling mbedtls_ssl_handshake_wrapup_free_hs_transform() * inappropriately. */ if (ssl->handshake != NULL) { mbedtls_ssl_handshake_free(ssl); mbedtls_free(ssl->handshake); ssl->handshake = NULL; } /* * Done - should have consumed entire buffer */ if (p != end) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } return 0; } /* * Deserialize context: public wrapper for error cleaning */ int mbedtls_ssl_context_load(mbedtls_ssl_context *context, const unsigned char *buf, size_t len) { int ret = ssl_context_load(context, buf, len); if (ret != 0) { mbedtls_ssl_free(context); } return ret; } #endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */ /* * Free an SSL context */ void mbedtls_ssl_free(mbedtls_ssl_context *ssl) { if (ssl == NULL) { return; } MBEDTLS_SSL_DEBUG_MSG(2, ("=> free")); if (ssl->out_buf != NULL) { #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) size_t out_buf_len = ssl->out_buf_len; #else size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN; #endif mbedtls_platform_zeroize(ssl->out_buf, out_buf_len); mbedtls_free(ssl->out_buf); ssl->out_buf = NULL; } if (ssl->in_buf != NULL) { #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) size_t in_buf_len = ssl->in_buf_len; #else size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN; #endif mbedtls_platform_zeroize(ssl->in_buf, in_buf_len); mbedtls_free(ssl->in_buf); ssl->in_buf = NULL; } if (ssl->transform) { mbedtls_ssl_transform_free(ssl->transform); mbedtls_free(ssl->transform); } if (ssl->handshake) { mbedtls_ssl_handshake_free(ssl); mbedtls_free(ssl->handshake); #if defined(MBEDTLS_SSL_PROTO_TLS1_2) mbedtls_ssl_transform_free(ssl->transform_negotiate); mbedtls_free(ssl->transform_negotiate); #endif mbedtls_ssl_session_free(ssl->session_negotiate); mbedtls_free(ssl->session_negotiate); } #if defined(MBEDTLS_SSL_PROTO_TLS1_3) mbedtls_ssl_transform_free(ssl->transform_application); mbedtls_free(ssl->transform_application); #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ if (ssl->session) { mbedtls_ssl_session_free(ssl->session); mbedtls_free(ssl->session); } #if defined(MBEDTLS_X509_CRT_PARSE_C) if (ssl->hostname != NULL) { mbedtls_platform_zeroize(ssl->hostname, strlen(ssl->hostname)); mbedtls_free(ssl->hostname); } #endif #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) mbedtls_free(ssl->cli_id); #endif MBEDTLS_SSL_DEBUG_MSG(2, ("<= free")); /* Actually clear after last debug message */ mbedtls_platform_zeroize(ssl, sizeof(mbedtls_ssl_context)); } /* * Initialize mbedtls_ssl_config */ void mbedtls_ssl_config_init(mbedtls_ssl_config *conf) { memset(conf, 0, sizeof(mbedtls_ssl_config)); } /* The selection should be the same as mbedtls_x509_crt_profile_default in * x509_crt.c, plus Montgomery curves for ECDHE. Here, the order matters: * curves with a lower resource usage come first. * See the documentation of mbedtls_ssl_conf_curves() for what we promise * about this list. */ static uint16_t ssl_preset_default_groups[] = { #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_X25519, #endif #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_SECP256R1, #endif #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_SECP384R1, #endif #if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_X448, #endif #if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_SECP521R1, #endif #if defined(MBEDTLS_ECP_DP_BP256R1_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_BP256R1, #endif #if defined(MBEDTLS_ECP_DP_BP384R1_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_BP384R1, #endif #if defined(MBEDTLS_ECP_DP_BP512R1_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_BP512R1, #endif MBEDTLS_SSL_IANA_TLS_GROUP_NONE }; static int ssl_preset_suiteb_ciphersuites[] = { MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 0 }; #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) /* NOTICE: * For ssl_preset_*_sig_algs and ssl_tls12_preset_*_sig_algs, the following * rules SHOULD be upheld. * - No duplicate entries. * - But if there is a good reason, do not change the order of the algorithms. * - ssl_tls12_preset* is for TLS 1.2 use only. * - ssl_preset_* is for TLS 1.3 only or hybrid TLS 1.3/1.2 handshakes. */ static uint16_t ssl_preset_default_sig_algs[] = { #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) && \ defined(MBEDTLS_MD_CAN_SHA256) && \ defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256, #endif /* MBEDTLS_PK_CAN_ECDSA_SOME && MBEDTLS_MD_CAN_SHA256 && MBEDTLS_ECP_DP_SECP256R1_ENABLED */ #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) && \ defined(MBEDTLS_MD_CAN_SHA384) && \ defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384, #endif /* MBEDTLS_PK_CAN_ECDSA_SOME && MBEDTLS_MD_CAN_SHA384&& MBEDTLS_ECP_DP_SECP384R1_ENABLED */ #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) && \ defined(MBEDTLS_MD_CAN_SHA512) && \ defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED) MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512, #endif /* MBEDTLS_PK_CAN_ECDSA_SOME && MBEDTLS_MD_CAN_SHA384&& MBEDTLS_ECP_DP_SECP521R1_ENABLED */ #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) && \ defined(MBEDTLS_MD_CAN_SHA512) MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512, #endif \ /* MBEDTLS_X509_RSASSA_PSS_SUPPORT && MBEDTLS_MD_CAN_SHA512 */ #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) && \ defined(MBEDTLS_MD_CAN_SHA384) MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384, #endif \ /* MBEDTLS_X509_RSASSA_PSS_SUPPORT && MBEDTLS_MD_CAN_SHA384 */ #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) && \ defined(MBEDTLS_MD_CAN_SHA256) MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256, #endif \ /* MBEDTLS_X509_RSASSA_PSS_SUPPORT && MBEDTLS_MD_CAN_SHA256 */ #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_MD_CAN_SHA512) MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA512, #endif /* MBEDTLS_RSA_C && MBEDTLS_MD_CAN_SHA512 */ #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_MD_CAN_SHA384) MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA384, #endif /* MBEDTLS_RSA_C && MBEDTLS_MD_CAN_SHA384 */ #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_MD_CAN_SHA256) MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256, #endif /* MBEDTLS_RSA_C && MBEDTLS_MD_CAN_SHA256 */ MBEDTLS_TLS_SIG_NONE }; /* NOTICE: see above */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) static uint16_t ssl_tls12_preset_default_sig_algs[] = { #if defined(MBEDTLS_MD_CAN_SHA512) #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_ECDSA, MBEDTLS_SSL_HASH_SHA512), #endif #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512, #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */ #if defined(MBEDTLS_RSA_C) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_RSA, MBEDTLS_SSL_HASH_SHA512), #endif #endif /* MBEDTLS_MD_CAN_SHA512*/ #if defined(MBEDTLS_MD_CAN_SHA384) #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_ECDSA, MBEDTLS_SSL_HASH_SHA384), #endif #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384, #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */ #if defined(MBEDTLS_RSA_C) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_RSA, MBEDTLS_SSL_HASH_SHA384), #endif #endif /* MBEDTLS_MD_CAN_SHA384*/ #if defined(MBEDTLS_MD_CAN_SHA256) #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_ECDSA, MBEDTLS_SSL_HASH_SHA256), #endif #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256, #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */ #if defined(MBEDTLS_RSA_C) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_RSA, MBEDTLS_SSL_HASH_SHA256), #endif #endif /* MBEDTLS_MD_CAN_SHA256*/ MBEDTLS_TLS_SIG_NONE }; #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ /* NOTICE: see above */ static uint16_t ssl_preset_suiteb_sig_algs[] = { #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_MD_CAN_SHA256) && \ defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256, #endif /* MBEDTLS_ECDSA_C && MBEDTLS_MD_CAN_SHA256&& MBEDTLS_ECP_DP_SECP256R1_ENABLED */ #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_MD_CAN_SHA384) && \ defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384, #endif /* MBEDTLS_ECDSA_C && MBEDTLS_MD_CAN_SHA384&& MBEDTLS_ECP_DP_SECP384R1_ENABLED */ #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) && \ defined(MBEDTLS_MD_CAN_SHA256) MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256, #endif \ /* MBEDTLS_X509_RSASSA_PSS_SUPPORT && MBEDTLS_MD_CAN_SHA256*/ #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_MD_CAN_SHA256) MBEDTLS_TLS1_3_SIG_RSA_PKCS1_SHA256, #endif /* MBEDTLS_RSA_C && MBEDTLS_MD_CAN_SHA256*/ MBEDTLS_TLS_SIG_NONE }; /* NOTICE: see above */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) static uint16_t ssl_tls12_preset_suiteb_sig_algs[] = { #if defined(MBEDTLS_MD_CAN_SHA256) #if defined(MBEDTLS_ECDSA_C) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_ECDSA, MBEDTLS_SSL_HASH_SHA256), #endif #if defined(MBEDTLS_RSA_C) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_RSA, MBEDTLS_SSL_HASH_SHA256), #endif #endif /* MBEDTLS_MD_CAN_SHA256*/ #if defined(MBEDTLS_MD_CAN_SHA384) #if defined(MBEDTLS_ECDSA_C) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_ECDSA, MBEDTLS_SSL_HASH_SHA384), #endif #if defined(MBEDTLS_RSA_C) MBEDTLS_SSL_TLS12_SIG_AND_HASH_ALG(MBEDTLS_SSL_SIG_RSA, MBEDTLS_SSL_HASH_SHA384), #endif #endif /* MBEDTLS_MD_CAN_SHA256*/ MBEDTLS_TLS_SIG_NONE }; #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ static uint16_t ssl_preset_suiteb_groups[] = { #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_SECP256R1, #endif #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) MBEDTLS_SSL_IANA_TLS_GROUP_SECP384R1, #endif MBEDTLS_SSL_IANA_TLS_GROUP_NONE }; #if defined(MBEDTLS_DEBUG_C) && defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) /* Function for checking `ssl_preset_*_sig_algs` and `ssl_tls12_preset_*_sig_algs` * to make sure there are no duplicated signature algorithm entries. */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_check_no_sig_alg_duplication(uint16_t *sig_algs) { size_t i, j; int ret = 0; for (i = 0; sig_algs[i] != MBEDTLS_TLS_SIG_NONE; i++) { for (j = 0; j < i; j++) { if (sig_algs[i] != sig_algs[j]) { continue; } mbedtls_printf(" entry(%04x,%" MBEDTLS_PRINTF_SIZET ") is duplicated at %" MBEDTLS_PRINTF_SIZET "\n", sig_algs[i], j, i); ret = -1; } } return ret; } #endif /* MBEDTLS_DEBUG_C && MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ /* * Load default in mbedtls_ssl_config */ int mbedtls_ssl_config_defaults(mbedtls_ssl_config *conf, int endpoint, int transport, int preset) { #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #endif #if defined(MBEDTLS_DEBUG_C) && defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) if (ssl_check_no_sig_alg_duplication(ssl_preset_suiteb_sig_algs)) { mbedtls_printf("ssl_preset_suiteb_sig_algs has duplicated entries\n"); return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; } if (ssl_check_no_sig_alg_duplication(ssl_preset_default_sig_algs)) { mbedtls_printf("ssl_preset_default_sig_algs has duplicated entries\n"); return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; } #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (ssl_check_no_sig_alg_duplication(ssl_tls12_preset_suiteb_sig_algs)) { mbedtls_printf("ssl_tls12_preset_suiteb_sig_algs has duplicated entries\n"); return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; } if (ssl_check_no_sig_alg_duplication(ssl_tls12_preset_default_sig_algs)) { mbedtls_printf("ssl_tls12_preset_default_sig_algs has duplicated entries\n"); return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #endif /* MBEDTLS_DEBUG_C && MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ /* Use the functions here so that they are covered in tests, * but otherwise access member directly for efficiency */ mbedtls_ssl_conf_endpoint(conf, endpoint); mbedtls_ssl_conf_transport(conf, transport); /* * Things that are common to all presets */ #if defined(MBEDTLS_SSL_CLI_C) if (endpoint == MBEDTLS_SSL_IS_CLIENT) { conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED; #if defined(MBEDTLS_SSL_SESSION_TICKETS) conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED; #endif } #endif #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; #endif #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; #endif #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) conf->f_cookie_write = ssl_cookie_write_dummy; conf->f_cookie_check = ssl_cookie_check_dummy; #endif #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED; #endif #if defined(MBEDTLS_SSL_SRV_C) conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED; conf->respect_cli_pref = MBEDTLS_SSL_SRV_CIPHERSUITE_ORDER_SERVER; #endif #if defined(MBEDTLS_SSL_PROTO_DTLS) conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN; conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX; #endif #if defined(MBEDTLS_SSL_RENEGOTIATION) conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT; memset(conf->renego_period, 0x00, 2); memset(conf->renego_period + 2, 0xFF, 6); #endif #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) if (endpoint == MBEDTLS_SSL_IS_SERVER) { const unsigned char dhm_p[] = MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN; const unsigned char dhm_g[] = MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN; if ((ret = mbedtls_ssl_conf_dh_param_bin(conf, dhm_p, sizeof(dhm_p), dhm_g, sizeof(dhm_g))) != 0) { return ret; } } #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_3) #if defined(MBEDTLS_SSL_EARLY_DATA) mbedtls_ssl_tls13_conf_early_data(conf, MBEDTLS_SSL_EARLY_DATA_DISABLED); #if defined(MBEDTLS_SSL_SRV_C) mbedtls_ssl_tls13_conf_max_early_data_size( conf, MBEDTLS_SSL_MAX_EARLY_DATA_SIZE); #endif #endif /* MBEDTLS_SSL_EARLY_DATA */ #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SESSION_TICKETS) mbedtls_ssl_conf_new_session_tickets( conf, MBEDTLS_SSL_TLS1_3_DEFAULT_NEW_SESSION_TICKETS); #endif /* * Allow all TLS 1.3 key exchange modes by default. */ conf->tls13_kex_modes = MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_ALL; #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ if (transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) conf->min_tls_version = MBEDTLS_SSL_VERSION_TLS1_2; conf->max_tls_version = MBEDTLS_SSL_VERSION_TLS1_2; #else return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; #endif } else { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && defined(MBEDTLS_SSL_PROTO_TLS1_3) if (endpoint == MBEDTLS_SSL_IS_CLIENT) { conf->min_tls_version = MBEDTLS_SSL_VERSION_TLS1_2; conf->max_tls_version = MBEDTLS_SSL_VERSION_TLS1_3; } else { /* Hybrid TLS 1.2 / 1.3 is not supported on server side yet */ conf->min_tls_version = MBEDTLS_SSL_VERSION_TLS1_2; conf->max_tls_version = MBEDTLS_SSL_VERSION_TLS1_2; } #elif defined(MBEDTLS_SSL_PROTO_TLS1_3) conf->min_tls_version = MBEDTLS_SSL_VERSION_TLS1_3; conf->max_tls_version = MBEDTLS_SSL_VERSION_TLS1_3; #elif defined(MBEDTLS_SSL_PROTO_TLS1_2) conf->min_tls_version = MBEDTLS_SSL_VERSION_TLS1_2; conf->max_tls_version = MBEDTLS_SSL_VERSION_TLS1_2; #else return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; #endif } /* * Preset-specific defaults */ switch (preset) { /* * NSA Suite B */ case MBEDTLS_SSL_PRESET_SUITEB: conf->ciphersuite_list = ssl_preset_suiteb_ciphersuites; #if defined(MBEDTLS_X509_CRT_PARSE_C) conf->cert_profile = &mbedtls_x509_crt_profile_suiteb; #endif #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (mbedtls_ssl_conf_is_tls12_only(conf)) { conf->sig_algs = ssl_tls12_preset_suiteb_sig_algs; } else #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ conf->sig_algs = ssl_preset_suiteb_sig_algs; #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_ECP_C) && !defined(MBEDTLS_DEPRECATED_REMOVED) conf->curve_list = NULL; #endif conf->group_list = ssl_preset_suiteb_groups; break; /* * Default */ default: conf->ciphersuite_list = mbedtls_ssl_list_ciphersuites(); #if defined(MBEDTLS_X509_CRT_PARSE_C) conf->cert_profile = &mbedtls_x509_crt_profile_default; #endif #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (mbedtls_ssl_conf_is_tls12_only(conf)) { conf->sig_algs = ssl_tls12_preset_default_sig_algs; } else #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ conf->sig_algs = ssl_preset_default_sig_algs; #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_ECP_C) && !defined(MBEDTLS_DEPRECATED_REMOVED) conf->curve_list = NULL; #endif conf->group_list = ssl_preset_default_groups; #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) conf->dhm_min_bitlen = 1024; #endif } return 0; } /* * Free mbedtls_ssl_config */ void mbedtls_ssl_config_free(mbedtls_ssl_config *conf) { #if defined(MBEDTLS_DHM_C) mbedtls_mpi_free(&conf->dhm_P); mbedtls_mpi_free(&conf->dhm_G); #endif #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED) #if defined(MBEDTLS_USE_PSA_CRYPTO) if (!mbedtls_svc_key_id_is_null(conf->psk_opaque)) { conf->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ if (conf->psk != NULL) { mbedtls_platform_zeroize(conf->psk, conf->psk_len); mbedtls_free(conf->psk); conf->psk = NULL; conf->psk_len = 0; } if (conf->psk_identity != NULL) { mbedtls_platform_zeroize(conf->psk_identity, conf->psk_identity_len); mbedtls_free(conf->psk_identity); conf->psk_identity = NULL; conf->psk_identity_len = 0; } #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_PSK_ENABLED */ #if defined(MBEDTLS_X509_CRT_PARSE_C) ssl_key_cert_free(conf->key_cert); #endif mbedtls_platform_zeroize(conf, sizeof(mbedtls_ssl_config)); } #if defined(MBEDTLS_PK_C) && \ (defined(MBEDTLS_RSA_C) || defined(MBEDTLS_PK_CAN_ECDSA_SOME)) /* * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX */ unsigned char mbedtls_ssl_sig_from_pk(mbedtls_pk_context *pk) { #if defined(MBEDTLS_RSA_C) if (mbedtls_pk_can_do(pk, MBEDTLS_PK_RSA)) { return MBEDTLS_SSL_SIG_RSA; } #endif #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) if (mbedtls_pk_can_do(pk, MBEDTLS_PK_ECDSA)) { return MBEDTLS_SSL_SIG_ECDSA; } #endif return MBEDTLS_SSL_SIG_ANON; } unsigned char mbedtls_ssl_sig_from_pk_alg(mbedtls_pk_type_t type) { switch (type) { case MBEDTLS_PK_RSA: return MBEDTLS_SSL_SIG_RSA; case MBEDTLS_PK_ECDSA: case MBEDTLS_PK_ECKEY: return MBEDTLS_SSL_SIG_ECDSA; default: return MBEDTLS_SSL_SIG_ANON; } } mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig(unsigned char sig) { switch (sig) { #if defined(MBEDTLS_RSA_C) case MBEDTLS_SSL_SIG_RSA: return MBEDTLS_PK_RSA; #endif #if defined(MBEDTLS_PK_CAN_ECDSA_SOME) case MBEDTLS_SSL_SIG_ECDSA: return MBEDTLS_PK_ECDSA; #endif default: return MBEDTLS_PK_NONE; } } #endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_PK_CAN_ECDSA_SOME ) */ /* * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX */ mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash(unsigned char hash) { switch (hash) { #if defined(MBEDTLS_MD_CAN_MD5) case MBEDTLS_SSL_HASH_MD5: return MBEDTLS_MD_MD5; #endif #if defined(MBEDTLS_MD_CAN_SHA1) case MBEDTLS_SSL_HASH_SHA1: return MBEDTLS_MD_SHA1; #endif #if defined(MBEDTLS_MD_CAN_SHA224) case MBEDTLS_SSL_HASH_SHA224: return MBEDTLS_MD_SHA224; #endif #if defined(MBEDTLS_MD_CAN_SHA256) case MBEDTLS_SSL_HASH_SHA256: return MBEDTLS_MD_SHA256; #endif #if defined(MBEDTLS_MD_CAN_SHA384) case MBEDTLS_SSL_HASH_SHA384: return MBEDTLS_MD_SHA384; #endif #if defined(MBEDTLS_MD_CAN_SHA512) case MBEDTLS_SSL_HASH_SHA512: return MBEDTLS_MD_SHA512; #endif default: return MBEDTLS_MD_NONE; } } /* * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX */ unsigned char mbedtls_ssl_hash_from_md_alg(int md) { switch (md) { #if defined(MBEDTLS_MD_CAN_MD5) case MBEDTLS_MD_MD5: return MBEDTLS_SSL_HASH_MD5; #endif #if defined(MBEDTLS_MD_CAN_SHA1) case MBEDTLS_MD_SHA1: return MBEDTLS_SSL_HASH_SHA1; #endif #if defined(MBEDTLS_MD_CAN_SHA224) case MBEDTLS_MD_SHA224: return MBEDTLS_SSL_HASH_SHA224; #endif #if defined(MBEDTLS_MD_CAN_SHA256) case MBEDTLS_MD_SHA256: return MBEDTLS_SSL_HASH_SHA256; #endif #if defined(MBEDTLS_MD_CAN_SHA384) case MBEDTLS_MD_SHA384: return MBEDTLS_SSL_HASH_SHA384; #endif #if defined(MBEDTLS_MD_CAN_SHA512) case MBEDTLS_MD_SHA512: return MBEDTLS_SSL_HASH_SHA512; #endif default: return MBEDTLS_SSL_HASH_NONE; } } /* * Check if a curve proposed by the peer is in our list. * Return 0 if we're willing to use it, -1 otherwise. */ int mbedtls_ssl_check_curve_tls_id(const mbedtls_ssl_context *ssl, uint16_t tls_id) { const uint16_t *group_list = mbedtls_ssl_get_groups(ssl); if (group_list == NULL) { return -1; } for (; *group_list != 0; group_list++) { if (*group_list == tls_id) { return 0; } } return -1; } #if defined(MBEDTLS_ECP_C) /* * Same as mbedtls_ssl_check_curve_tls_id() but with a mbedtls_ecp_group_id. */ int mbedtls_ssl_check_curve(const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id) { uint16_t tls_id = mbedtls_ssl_get_tls_id_from_ecp_group_id(grp_id); if (tls_id == 0) { return -1; } return mbedtls_ssl_check_curve_tls_id(ssl, tls_id); } #endif /* MBEDTLS_ECP_C */ #if defined(MBEDTLS_DEBUG_C) #define EC_NAME(_name_) _name_ #else #define EC_NAME(_name_) NULL #endif static const struct { uint16_t tls_id; mbedtls_ecp_group_id ecp_group_id; psa_ecc_family_t psa_family; uint16_t bits; const char *name; } tls_id_match_table[] = { #if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_521) { 25, MBEDTLS_ECP_DP_SECP521R1, PSA_ECC_FAMILY_SECP_R1, 521, EC_NAME("secp521r1") }, #endif #if defined(MBEDTLS_ECP_DP_BP512R1_ENABLED) || defined(PSA_WANT_ECC_BRAINPOOL_P_R1_512) { 28, MBEDTLS_ECP_DP_BP512R1, PSA_ECC_FAMILY_BRAINPOOL_P_R1, 512, EC_NAME("brainpoolP512r1") }, #endif #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_384) { 24, MBEDTLS_ECP_DP_SECP384R1, PSA_ECC_FAMILY_SECP_R1, 384, EC_NAME("secp384r1") }, #endif #if defined(MBEDTLS_ECP_DP_BP384R1_ENABLED) || defined(PSA_WANT_ECC_BRAINPOOL_P_R1_384) { 27, MBEDTLS_ECP_DP_BP384R1, PSA_ECC_FAMILY_BRAINPOOL_P_R1, 384, EC_NAME("brainpoolP384r1") }, #endif #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_256) { 23, MBEDTLS_ECP_DP_SECP256R1, PSA_ECC_FAMILY_SECP_R1, 256, EC_NAME("secp256r1") }, #endif #if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED) || defined(PSA_WANT_ECC_SECP_K1_256) { 22, MBEDTLS_ECP_DP_SECP256K1, PSA_ECC_FAMILY_SECP_K1, 256, EC_NAME("secp256k1") }, #endif #if defined(MBEDTLS_ECP_DP_BP256R1_ENABLED) || defined(PSA_WANT_ECC_BRAINPOOL_P_R1_256) { 26, MBEDTLS_ECP_DP_BP256R1, PSA_ECC_FAMILY_BRAINPOOL_P_R1, 256, EC_NAME("brainpoolP256r1") }, #endif #if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_224) { 21, MBEDTLS_ECP_DP_SECP224R1, PSA_ECC_FAMILY_SECP_R1, 224, EC_NAME("secp224r1") }, #endif #if defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED) || defined(PSA_WANT_ECC_SECP_K1_224) { 20, MBEDTLS_ECP_DP_SECP224K1, PSA_ECC_FAMILY_SECP_K1, 224, EC_NAME("secp224k1") }, #endif #if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_192) { 19, MBEDTLS_ECP_DP_SECP192R1, PSA_ECC_FAMILY_SECP_R1, 192, EC_NAME("secp192r1") }, #endif #if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) || defined(PSA_WANT_ECC_SECP_K1_192) { 18, MBEDTLS_ECP_DP_SECP192K1, PSA_ECC_FAMILY_SECP_K1, 192, EC_NAME("secp192k1") }, #endif #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) || defined(PSA_WANT_ECC_MONTGOMERY_255) { 29, MBEDTLS_ECP_DP_CURVE25519, PSA_ECC_FAMILY_MONTGOMERY, 255, EC_NAME("x25519") }, #endif #if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED) || defined(PSA_WANT_ECC_MONTGOMERY_448) { 30, MBEDTLS_ECP_DP_CURVE448, PSA_ECC_FAMILY_MONTGOMERY, 448, EC_NAME("x448") }, #endif { 0, MBEDTLS_ECP_DP_NONE, 0, 0, NULL }, }; int mbedtls_ssl_get_psa_curve_info_from_tls_id(uint16_t tls_id, psa_ecc_family_t *family, size_t *bits) { for (int i = 0; tls_id_match_table[i].tls_id != 0; i++) { if (tls_id_match_table[i].tls_id == tls_id) { if (family != NULL) { *family = tls_id_match_table[i].psa_family; } if (bits != NULL) { *bits = tls_id_match_table[i].bits; } return PSA_SUCCESS; } } return PSA_ERROR_NOT_SUPPORTED; } mbedtls_ecp_group_id mbedtls_ssl_get_ecp_group_id_from_tls_id(uint16_t tls_id) { for (int i = 0; tls_id_match_table[i].tls_id != 0; i++) { if (tls_id_match_table[i].tls_id == tls_id) { return tls_id_match_table[i].ecp_group_id; } } return MBEDTLS_ECP_DP_NONE; } uint16_t mbedtls_ssl_get_tls_id_from_ecp_group_id(mbedtls_ecp_group_id grp_id) { for (int i = 0; tls_id_match_table[i].ecp_group_id != MBEDTLS_ECP_DP_NONE; i++) { if (tls_id_match_table[i].ecp_group_id == grp_id) { return tls_id_match_table[i].tls_id; } } return 0; } #if defined(MBEDTLS_DEBUG_C) const char *mbedtls_ssl_get_curve_name_from_tls_id(uint16_t tls_id) { for (int i = 0; tls_id_match_table[i].tls_id != 0; i++) { if (tls_id_match_table[i].tls_id == tls_id) { return tls_id_match_table[i].name; } } return NULL; } #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) int mbedtls_ssl_check_cert_usage(const mbedtls_x509_crt *cert, const mbedtls_ssl_ciphersuite_t *ciphersuite, int cert_endpoint, uint32_t *flags) { int ret = 0; int usage = 0; const char *ext_oid; size_t ext_len; if (cert_endpoint == MBEDTLS_SSL_IS_SERVER) { /* Server part of the key exchange */ switch (ciphersuite->key_exchange) { case MBEDTLS_KEY_EXCHANGE_RSA: case MBEDTLS_KEY_EXCHANGE_RSA_PSK: usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT; break; case MBEDTLS_KEY_EXCHANGE_DHE_RSA: case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA: case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA: usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; break; case MBEDTLS_KEY_EXCHANGE_ECDH_RSA: case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA: usage = MBEDTLS_X509_KU_KEY_AGREEMENT; break; /* Don't use default: we want warnings when adding new values */ case MBEDTLS_KEY_EXCHANGE_NONE: case MBEDTLS_KEY_EXCHANGE_PSK: case MBEDTLS_KEY_EXCHANGE_DHE_PSK: case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK: case MBEDTLS_KEY_EXCHANGE_ECJPAKE: usage = 0; } } else { /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */ usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; } if (mbedtls_x509_crt_check_key_usage(cert, usage) != 0) { *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE; ret = -1; } if (cert_endpoint == MBEDTLS_SSL_IS_SERVER) { ext_oid = MBEDTLS_OID_SERVER_AUTH; ext_len = MBEDTLS_OID_SIZE(MBEDTLS_OID_SERVER_AUTH); } else { ext_oid = MBEDTLS_OID_CLIENT_AUTH; ext_len = MBEDTLS_OID_SIZE(MBEDTLS_OID_CLIENT_AUTH); } if (mbedtls_x509_crt_check_extended_key_usage(cert, ext_oid, ext_len) != 0) { *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE; ret = -1; } return ret; } #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_USE_PSA_CRYPTO) int mbedtls_ssl_get_handshake_transcript(mbedtls_ssl_context *ssl, const mbedtls_md_type_t md, unsigned char *dst, size_t dst_len, size_t *olen) { psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED; psa_hash_operation_t *hash_operation_to_clone; psa_hash_operation_t hash_operation = psa_hash_operation_init(); *olen = 0; switch (md) { #if defined(MBEDTLS_MD_CAN_SHA384) case MBEDTLS_MD_SHA384: hash_operation_to_clone = &ssl->handshake->fin_sha384_psa; break; #endif #if defined(MBEDTLS_MD_CAN_SHA256) case MBEDTLS_MD_SHA256: hash_operation_to_clone = &ssl->handshake->fin_sha256_psa; break; #endif default: goto exit; } status = psa_hash_clone(hash_operation_to_clone, &hash_operation); if (status != PSA_SUCCESS) { goto exit; } status = psa_hash_finish(&hash_operation, dst, dst_len, olen); if (status != PSA_SUCCESS) { goto exit; } exit: #if !defined(MBEDTLS_MD_CAN_SHA384) && \ !defined(MBEDTLS_MD_CAN_SHA256) (void) ssl; #endif return PSA_TO_MBEDTLS_ERR(status); } #else /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_MD_CAN_SHA384) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_get_handshake_transcript_sha384(mbedtls_ssl_context *ssl, unsigned char *dst, size_t dst_len, size_t *olen) { int ret; mbedtls_md_context_t sha384; if (dst_len < 48) { return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } mbedtls_md_init(&sha384); ret = mbedtls_md_setup(&sha384, mbedtls_md_info_from_type(MBEDTLS_MD_SHA384), 0); if (ret != 0) { goto exit; } ret = mbedtls_md_clone(&sha384, &ssl->handshake->fin_sha384); if (ret != 0) { goto exit; } if ((ret = mbedtls_md_finish(&sha384, dst)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_finish", ret); goto exit; } *olen = 48; exit: mbedtls_md_free(&sha384); return ret; } #endif /* MBEDTLS_MD_CAN_SHA384 */ #if defined(MBEDTLS_MD_CAN_SHA256) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_get_handshake_transcript_sha256(mbedtls_ssl_context *ssl, unsigned char *dst, size_t dst_len, size_t *olen) { int ret; mbedtls_md_context_t sha256; if (dst_len < 32) { return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } mbedtls_md_init(&sha256); ret = mbedtls_md_setup(&sha256, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 0); if (ret != 0) { goto exit; } ret = mbedtls_md_clone(&sha256, &ssl->handshake->fin_sha256); if (ret != 0) { goto exit; } if ((ret = mbedtls_md_finish(&sha256, dst)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_finish", ret); goto exit; } *olen = 32; exit: mbedtls_md_free(&sha256); return ret; } #endif /* MBEDTLS_MD_CAN_SHA256 */ int mbedtls_ssl_get_handshake_transcript(mbedtls_ssl_context *ssl, const mbedtls_md_type_t md, unsigned char *dst, size_t dst_len, size_t *olen) { switch (md) { #if defined(MBEDTLS_MD_CAN_SHA384) case MBEDTLS_MD_SHA384: return ssl_get_handshake_transcript_sha384(ssl, dst, dst_len, olen); #endif /* MBEDTLS_MD_CAN_SHA384*/ #if defined(MBEDTLS_MD_CAN_SHA256) case MBEDTLS_MD_SHA256: return ssl_get_handshake_transcript_sha256(ssl, dst, dst_len, olen); #endif /* MBEDTLS_MD_CAN_SHA256*/ default: #if !defined(MBEDTLS_MD_CAN_SHA384) && \ !defined(MBEDTLS_MD_CAN_SHA256) (void) ssl; (void) dst; (void) dst_len; (void) olen; #endif break; } return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } #endif /* !MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) /* mbedtls_ssl_parse_sig_alg_ext() * * The `extension_data` field of signature algorithm contains a `SignatureSchemeList` * value (TLS 1.3 RFC8446): * enum { * .... * ecdsa_secp256r1_sha256( 0x0403 ), * ecdsa_secp384r1_sha384( 0x0503 ), * ecdsa_secp521r1_sha512( 0x0603 ), * .... * } SignatureScheme; * * struct { * SignatureScheme supported_signature_algorithms<2..2^16-2>; * } SignatureSchemeList; * * The `extension_data` field of signature algorithm contains a `SignatureAndHashAlgorithm` * value (TLS 1.2 RFC5246): * enum { * none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5), * sha512(6), (255) * } HashAlgorithm; * * enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) } * SignatureAlgorithm; * * struct { * HashAlgorithm hash; * SignatureAlgorithm signature; * } SignatureAndHashAlgorithm; * * SignatureAndHashAlgorithm * supported_signature_algorithms<2..2^16-2>; * * The TLS 1.3 signature algorithm extension was defined to be a compatible * generalization of the TLS 1.2 signature algorithm extension. * `SignatureAndHashAlgorithm` field of TLS 1.2 can be represented by * `SignatureScheme` field of TLS 1.3 * */ int mbedtls_ssl_parse_sig_alg_ext(mbedtls_ssl_context *ssl, const unsigned char *buf, const unsigned char *end) { const unsigned char *p = buf; size_t supported_sig_algs_len = 0; const unsigned char *supported_sig_algs_end; uint16_t sig_alg; uint32_t common_idx = 0; MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, 2); supported_sig_algs_len = MBEDTLS_GET_UINT16_BE(p, 0); p += 2; memset(ssl->handshake->received_sig_algs, 0, sizeof(ssl->handshake->received_sig_algs)); MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, supported_sig_algs_len); supported_sig_algs_end = p + supported_sig_algs_len; while (p < supported_sig_algs_end) { MBEDTLS_SSL_CHK_BUF_READ_PTR(p, supported_sig_algs_end, 2); sig_alg = MBEDTLS_GET_UINT16_BE(p, 0); p += 2; MBEDTLS_SSL_DEBUG_MSG(4, ("received signature algorithm: 0x%x %s", sig_alg, mbedtls_ssl_sig_alg_to_str(sig_alg))); #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if (ssl->tls_version == MBEDTLS_SSL_VERSION_TLS1_2 && (!(mbedtls_ssl_sig_alg_is_supported(ssl, sig_alg) && mbedtls_ssl_sig_alg_is_offered(ssl, sig_alg)))) { continue; } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ MBEDTLS_SSL_DEBUG_MSG(4, ("valid signature algorithm: %s", mbedtls_ssl_sig_alg_to_str(sig_alg))); if (common_idx + 1 < MBEDTLS_RECEIVED_SIG_ALGS_SIZE) { ssl->handshake->received_sig_algs[common_idx] = sig_alg; common_idx += 1; } } /* Check that we consumed all the message. */ if (p != end) { MBEDTLS_SSL_DEBUG_MSG(1, ("Signature algorithms extension length misaligned")); MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR, MBEDTLS_ERR_SSL_DECODE_ERROR); return MBEDTLS_ERR_SSL_DECODE_ERROR; } if (common_idx == 0) { MBEDTLS_SSL_DEBUG_MSG(3, ("no signature algorithm in common")); MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE, MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE); return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; } ssl->handshake->received_sig_algs[common_idx] = MBEDTLS_TLS_SIG_NONE; return 0; } #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_USE_PSA_CRYPTO) static psa_status_t setup_psa_key_derivation(psa_key_derivation_operation_t *derivation, mbedtls_svc_key_id_t key, psa_algorithm_t alg, const unsigned char *raw_psk, size_t raw_psk_length, const unsigned char *seed, size_t seed_length, const unsigned char *label, size_t label_length, const unsigned char *other_secret, size_t other_secret_length, size_t capacity) { psa_status_t status; status = psa_key_derivation_setup(derivation, alg); if (status != PSA_SUCCESS) { return status; } if (PSA_ALG_IS_TLS12_PRF(alg) || PSA_ALG_IS_TLS12_PSK_TO_MS(alg)) { status = psa_key_derivation_input_bytes(derivation, PSA_KEY_DERIVATION_INPUT_SEED, seed, seed_length); if (status != PSA_SUCCESS) { return status; } if (other_secret != NULL) { status = psa_key_derivation_input_bytes(derivation, PSA_KEY_DERIVATION_INPUT_OTHER_SECRET, other_secret, other_secret_length); if (status != PSA_SUCCESS) { return status; } } if (mbedtls_svc_key_id_is_null(key)) { status = psa_key_derivation_input_bytes( derivation, PSA_KEY_DERIVATION_INPUT_SECRET, raw_psk, raw_psk_length); } else { status = psa_key_derivation_input_key( derivation, PSA_KEY_DERIVATION_INPUT_SECRET, key); } if (status != PSA_SUCCESS) { return status; } status = psa_key_derivation_input_bytes(derivation, PSA_KEY_DERIVATION_INPUT_LABEL, label, label_length); if (status != PSA_SUCCESS) { return status; } } else { return PSA_ERROR_NOT_SUPPORTED; } status = psa_key_derivation_set_capacity(derivation, capacity); if (status != PSA_SUCCESS) { return status; } return PSA_SUCCESS; } #if defined(PSA_WANT_ALG_SHA_384) || \ defined(PSA_WANT_ALG_SHA_256) MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_generic(mbedtls_md_type_t md_type, const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { psa_status_t status; psa_algorithm_t alg; mbedtls_svc_key_id_t master_key = MBEDTLS_SVC_KEY_ID_INIT; psa_key_derivation_operation_t derivation = PSA_KEY_DERIVATION_OPERATION_INIT; if (md_type == MBEDTLS_MD_SHA384) { alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_384); } else { alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256); } /* Normally a "secret" should be long enough to be impossible to * find by brute force, and in particular should not be empty. But * this PRF is also used to derive an IV, in particular in EAP-TLS, * and for this use case it makes sense to have a 0-length "secret". * Since the key API doesn't allow importing a key of length 0, * keep master_key=0, which setup_psa_key_derivation() understands * to mean a 0-length "secret" input. */ if (slen != 0) { psa_key_attributes_t key_attributes = psa_key_attributes_init(); psa_set_key_usage_flags(&key_attributes, PSA_KEY_USAGE_DERIVE); psa_set_key_algorithm(&key_attributes, alg); psa_set_key_type(&key_attributes, PSA_KEY_TYPE_DERIVE); status = psa_import_key(&key_attributes, secret, slen, &master_key); if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } } status = setup_psa_key_derivation(&derivation, master_key, alg, NULL, 0, random, rlen, (unsigned char const *) label, (size_t) strlen(label), NULL, 0, dlen); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); psa_destroy_key(master_key); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_output_bytes(&derivation, dstbuf, dlen); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); psa_destroy_key(master_key); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_abort(&derivation); if (status != PSA_SUCCESS) { psa_destroy_key(master_key); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } if (!mbedtls_svc_key_id_is_null(master_key)) { status = psa_destroy_key(master_key); } if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } return 0; } #endif /* PSA_WANT_ALG_SHA_256 || PSA_WANT_ALG_SHA_384 */ #else /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_MD_C) && \ (defined(MBEDTLS_MD_CAN_SHA256) || \ defined(MBEDTLS_MD_CAN_SHA384)) MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_generic(mbedtls_md_type_t md_type, const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { size_t nb; size_t i, j, k, md_len; unsigned char *tmp; size_t tmp_len = 0; unsigned char h_i[MBEDTLS_MD_MAX_SIZE]; const mbedtls_md_info_t *md_info; mbedtls_md_context_t md_ctx; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md_init(&md_ctx); if ((md_info = mbedtls_md_info_from_type(md_type)) == NULL) { return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } md_len = mbedtls_md_get_size(md_info); tmp_len = md_len + strlen(label) + rlen; tmp = mbedtls_calloc(1, tmp_len); if (tmp == NULL) { ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; goto exit; } nb = strlen(label); memcpy(tmp + md_len, label, nb); memcpy(tmp + md_len + nb, random, rlen); nb += rlen; /* * Compute P_(secret, label + random)[0..dlen] */ if ((ret = mbedtls_md_setup(&md_ctx, md_info, 1)) != 0) { goto exit; } ret = mbedtls_md_hmac_starts(&md_ctx, secret, slen); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp + md_len, nb); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, tmp); if (ret != 0) { goto exit; } for (i = 0; i < dlen; i += md_len) { ret = mbedtls_md_hmac_reset(&md_ctx); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp, md_len + nb); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, h_i); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_reset(&md_ctx); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_update(&md_ctx, tmp, md_len); if (ret != 0) { goto exit; } ret = mbedtls_md_hmac_finish(&md_ctx, tmp); if (ret != 0) { goto exit; } k = (i + md_len > dlen) ? dlen % md_len : md_len; for (j = 0; j < k; j++) { dstbuf[i + j] = h_i[j]; } } exit: mbedtls_md_free(&md_ctx); if (tmp != NULL) { mbedtls_platform_zeroize(tmp, tmp_len); } mbedtls_platform_zeroize(h_i, sizeof(h_i)); mbedtls_free(tmp); return ret; } #endif /* MBEDTLS_MD_C && ( MBEDTLS_MD_CAN_SHA256 || MBEDTLS_MD_CAN_SHA384 ) */ #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_MD_CAN_SHA256) MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_sha256(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { return tls_prf_generic(MBEDTLS_MD_SHA256, secret, slen, label, random, rlen, dstbuf, dlen); } #endif /* MBEDTLS_MD_CAN_SHA256*/ #if defined(MBEDTLS_MD_CAN_SHA384) MBEDTLS_CHECK_RETURN_CRITICAL static int tls_prf_sha384(const unsigned char *secret, size_t slen, const char *label, const unsigned char *random, size_t rlen, unsigned char *dstbuf, size_t dlen) { return tls_prf_generic(MBEDTLS_MD_SHA384, secret, slen, label, random, rlen, dstbuf, dlen); } #endif /* MBEDTLS_MD_CAN_SHA384*/ /* * Set appropriate PRF function and other SSL / TLS1.2 functions * * Inputs: * - hash associated with the ciphersuite (only used by TLS 1.2) * * Outputs: * - the tls_prf, calc_verify and calc_finished members of handshake structure */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_set_handshake_prfs(mbedtls_ssl_handshake_params *handshake, mbedtls_md_type_t hash) { #if defined(MBEDTLS_MD_CAN_SHA384) if (hash == MBEDTLS_MD_SHA384) { handshake->tls_prf = tls_prf_sha384; handshake->calc_verify = ssl_calc_verify_tls_sha384; handshake->calc_finished = ssl_calc_finished_tls_sha384; } else #endif #if defined(MBEDTLS_MD_CAN_SHA256) { (void) hash; handshake->tls_prf = tls_prf_sha256; handshake->calc_verify = ssl_calc_verify_tls_sha256; handshake->calc_finished = ssl_calc_finished_tls_sha256; } #else { (void) handshake; (void) hash; return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } #endif return 0; } /* * Compute master secret if needed * * Parameters: * [in/out] handshake * [in] resume, premaster, extended_ms, calc_verify, tls_prf * (PSA-PSK) ciphersuite_info, psk_opaque * [out] premaster (cleared) * [out] master * [in] ssl: optionally used for debugging, EMS and PSA-PSK * debug: conf->f_dbg, conf->p_dbg * EMS: passed to calc_verify (debug + session_negotiate) * PSA-PSA: conf */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_compute_master(mbedtls_ssl_handshake_params *handshake, unsigned char *master, const mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* cf. RFC 5246, Section 8.1: * "The master secret is always exactly 48 bytes in length." */ size_t const master_secret_len = 48; #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) unsigned char session_hash[48]; #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ /* The label for the KDF used for key expansion. * This is either "master secret" or "extended master secret" * depending on whether the Extended Master Secret extension * is used. */ char const *lbl = "master secret"; /* The seed for the KDF used for key expansion. * - If the Extended Master Secret extension is not used, * this is ClientHello.Random + ServerHello.Random * (see Sect. 8.1 in RFC 5246). * - If the Extended Master Secret extension is used, * this is the transcript of the handshake so far. * (see Sect. 4 in RFC 7627). */ unsigned char const *seed = handshake->randbytes; size_t seed_len = 64; #if !defined(MBEDTLS_DEBUG_C) && \ !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) && \ !(defined(MBEDTLS_USE_PSA_CRYPTO) && \ defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)) ssl = NULL; /* make sure we don't use it except for those cases */ (void) ssl; #endif if (handshake->resume != 0) { MBEDTLS_SSL_DEBUG_MSG(3, ("no premaster (session resumed)")); return 0; } #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) if (handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED) { lbl = "extended master secret"; seed = session_hash; ret = handshake->calc_verify(ssl, session_hash, &seed_len); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "calc_verify", ret); } MBEDTLS_SSL_DEBUG_BUF(3, "session hash for extended master secret", session_hash, seed_len); } #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ #if defined(MBEDTLS_USE_PSA_CRYPTO) && \ defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) if (mbedtls_ssl_ciphersuite_uses_psk(handshake->ciphersuite_info) == 1) { /* Perform PSK-to-MS expansion in a single step. */ psa_status_t status; psa_algorithm_t alg; mbedtls_svc_key_id_t psk; psa_key_derivation_operation_t derivation = PSA_KEY_DERIVATION_OPERATION_INIT; mbedtls_md_type_t hash_alg = handshake->ciphersuite_info->mac; MBEDTLS_SSL_DEBUG_MSG(2, ("perform PSA-based PSK-to-MS expansion")); psk = mbedtls_ssl_get_opaque_psk(ssl); if (hash_alg == MBEDTLS_MD_SHA384) { alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384); } else { alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256); } size_t other_secret_len = 0; unsigned char *other_secret = NULL; switch (handshake->ciphersuite_info->key_exchange) { /* Provide other secret. * Other secret is stored in premaster, where first 2 bytes hold the * length of the other key. */ case MBEDTLS_KEY_EXCHANGE_RSA_PSK: /* For RSA-PSK other key length is always 48 bytes. */ other_secret_len = 48; other_secret = handshake->premaster + 2; break; case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK: case MBEDTLS_KEY_EXCHANGE_DHE_PSK: other_secret_len = MBEDTLS_GET_UINT16_BE(handshake->premaster, 0); other_secret = handshake->premaster + 2; break; default: break; } status = setup_psa_key_derivation(&derivation, psk, alg, ssl->conf->psk, ssl->conf->psk_len, seed, seed_len, (unsigned char const *) lbl, (size_t) strlen(lbl), other_secret, other_secret_len, master_secret_len); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_output_bytes(&derivation, master, master_secret_len); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_abort(&derivation); if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } } else #endif { #if defined(MBEDTLS_USE_PSA_CRYPTO) && \ defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) if (handshake->ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE) { psa_status_t status; psa_algorithm_t alg = PSA_ALG_TLS12_ECJPAKE_TO_PMS; psa_key_derivation_operation_t derivation = PSA_KEY_DERIVATION_OPERATION_INIT; MBEDTLS_SSL_DEBUG_MSG(2, ("perform PSA-based PMS KDF for ECJPAKE")); handshake->pmslen = PSA_TLS12_ECJPAKE_TO_PMS_DATA_SIZE; status = psa_key_derivation_setup(&derivation, alg); if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_set_capacity(&derivation, PSA_TLS12_ECJPAKE_TO_PMS_DATA_SIZE); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_pake_get_implicit_key(&handshake->psa_pake_ctx, &derivation); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_output_bytes(&derivation, handshake->premaster, handshake->pmslen); if (status != PSA_SUCCESS) { psa_key_derivation_abort(&derivation); return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } status = psa_key_derivation_abort(&derivation); if (status != PSA_SUCCESS) { return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; } } #endif ret = handshake->tls_prf(handshake->premaster, handshake->pmslen, lbl, seed, seed_len, master, master_secret_len); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "prf", ret); return ret; } MBEDTLS_SSL_DEBUG_BUF(3, "premaster secret", handshake->premaster, handshake->pmslen); mbedtls_platform_zeroize(handshake->premaster, sizeof(handshake->premaster)); } return 0; } int mbedtls_ssl_derive_keys(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = ssl->handshake->ciphersuite_info; MBEDTLS_SSL_DEBUG_MSG(2, ("=> derive keys")); /* Set PRF, calc_verify and calc_finished function pointers */ ret = ssl_set_handshake_prfs(ssl->handshake, ciphersuite_info->mac); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "ssl_set_handshake_prfs", ret); return ret; } /* Compute master secret if needed */ ret = ssl_compute_master(ssl->handshake, ssl->session_negotiate->master, ssl); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "ssl_compute_master", ret); return ret; } /* Swap the client and server random values: * - MS derivation wanted client+server (RFC 5246 8.1) * - key derivation wants server+client (RFC 5246 6.3) */ { unsigned char tmp[64]; memcpy(tmp, ssl->handshake->randbytes, 64); memcpy(ssl->handshake->randbytes, tmp + 32, 32); memcpy(ssl->handshake->randbytes + 32, tmp, 32); mbedtls_platform_zeroize(tmp, sizeof(tmp)); } /* Populate transform structure */ ret = ssl_tls12_populate_transform(ssl->transform_negotiate, ssl->session_negotiate->ciphersuite, ssl->session_negotiate->master, #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) ssl->session_negotiate->encrypt_then_mac, #endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */ ssl->handshake->tls_prf, ssl->handshake->randbytes, ssl->tls_version, ssl->conf->endpoint, ssl); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "ssl_tls12_populate_transform", ret); return ret; } /* We no longer need Server/ClientHello.random values */ mbedtls_platform_zeroize(ssl->handshake->randbytes, sizeof(ssl->handshake->randbytes)); MBEDTLS_SSL_DEBUG_MSG(2, ("<= derive keys")); return 0; } int mbedtls_ssl_set_calc_verify_md(mbedtls_ssl_context *ssl, int md) { switch (md) { #if defined(MBEDTLS_MD_CAN_SHA384) case MBEDTLS_SSL_HASH_SHA384: ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384; break; #endif #if defined(MBEDTLS_MD_CAN_SHA256) case MBEDTLS_SSL_HASH_SHA256: ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256; break; #endif default: return -1; } #if !defined(MBEDTLS_MD_CAN_SHA384) && \ !defined(MBEDTLS_MD_CAN_SHA256) (void) ssl; #endif return 0; } #if defined(MBEDTLS_MD_CAN_SHA256) int ssl_calc_verify_tls_sha256(const mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hlen) { #if defined(MBEDTLS_USE_PSA_CRYPTO) size_t hash_size; psa_status_t status; psa_hash_operation_t sha256_psa = psa_hash_operation_init(); MBEDTLS_SSL_DEBUG_MSG(2, ("=> PSA calc verify sha256")); status = psa_hash_clone(&ssl->handshake->fin_sha256_psa, &sha256_psa); if (status != PSA_SUCCESS) { goto exit; } status = psa_hash_finish(&sha256_psa, hash, 32, &hash_size); if (status != PSA_SUCCESS) { goto exit; } *hlen = 32; MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= PSA calc verify")); exit: psa_hash_abort(&sha256_psa); return PSA_TO_MD_ERR(status); #else int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md_context_t sha256; mbedtls_md_init(&sha256); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify sha256")); ret = mbedtls_md_setup(&sha256, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 0); if (ret != 0) { goto exit; } ret = mbedtls_md_clone(&sha256, &ssl->handshake->fin_sha256); if (ret != 0) { goto exit; } ret = mbedtls_md_finish(&sha256, hash); if (ret != 0) { goto exit; } *hlen = 32; MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify")); exit: mbedtls_md_free(&sha256); return ret; #endif /* MBEDTLS_USE_PSA_CRYPTO */ } #endif /* MBEDTLS_MD_CAN_SHA256 */ #if defined(MBEDTLS_MD_CAN_SHA384) int ssl_calc_verify_tls_sha384(const mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hlen) { #if defined(MBEDTLS_USE_PSA_CRYPTO) size_t hash_size; psa_status_t status; psa_hash_operation_t sha384_psa = psa_hash_operation_init(); MBEDTLS_SSL_DEBUG_MSG(2, ("=> PSA calc verify sha384")); status = psa_hash_clone(&ssl->handshake->fin_sha384_psa, &sha384_psa); if (status != PSA_SUCCESS) { goto exit; } status = psa_hash_finish(&sha384_psa, hash, 48, &hash_size); if (status != PSA_SUCCESS) { goto exit; } *hlen = 48; MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= PSA calc verify")); exit: psa_hash_abort(&sha384_psa); return PSA_TO_MD_ERR(status); #else int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md_context_t sha384; mbedtls_md_init(&sha384); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify sha384")); ret = mbedtls_md_setup(&sha384, mbedtls_md_info_from_type(MBEDTLS_MD_SHA384), 0); if (ret != 0) { goto exit; } ret = mbedtls_md_clone(&sha384, &ssl->handshake->fin_sha384); if (ret != 0) { goto exit; } ret = mbedtls_md_finish(&sha384, hash); if (ret != 0) { goto exit; } *hlen = 48; MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify")); exit: mbedtls_md_free(&sha384); return ret; #endif /* MBEDTLS_USE_PSA_CRYPTO */ } #endif /* MBEDTLS_MD_CAN_SHA384 */ #if !defined(MBEDTLS_USE_PSA_CRYPTO) && \ defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) int mbedtls_ssl_psk_derive_premaster(mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex) { unsigned char *p = ssl->handshake->premaster; unsigned char *end = p + sizeof(ssl->handshake->premaster); const unsigned char *psk = NULL; size_t psk_len = 0; int psk_ret = mbedtls_ssl_get_psk(ssl, &psk, &psk_len); if (psk_ret == MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED) { /* * This should never happen because the existence of a PSK is always * checked before calling this function. * * The exception is opaque DHE-PSK. For DHE-PSK fill premaster with * the shared secret without PSK. */ if (key_ex != MBEDTLS_KEY_EXCHANGE_DHE_PSK) { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } } /* * PMS = struct { * opaque other_secret<0..2^16-1>; * opaque psk<0..2^16-1>; * }; * with "other_secret" depending on the particular key exchange */ #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) if (key_ex == MBEDTLS_KEY_EXCHANGE_PSK) { if (end - p < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } MBEDTLS_PUT_UINT16_BE(psk_len, p, 0); p += 2; if (end < p || (size_t) (end - p) < psk_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memset(p, 0, psk_len); p += psk_len; } else #endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ #if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) if (key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK) { /* * other_secret already set by the ClientKeyExchange message, * and is 48 bytes long */ if (end - p < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } *p++ = 0; *p++ = 48; p += 48; } else #endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) if (key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; size_t len; /* Write length only when we know the actual value */ if ((ret = mbedtls_dhm_calc_secret(&ssl->handshake->dhm_ctx, p + 2, end - (p + 2), &len, ssl->conf->f_rng, ssl->conf->p_rng)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_dhm_calc_secret", ret); return ret; } MBEDTLS_PUT_UINT16_BE(len, p, 0); p += 2 + len; MBEDTLS_SSL_DEBUG_MPI(3, "DHM: K ", &ssl->handshake->dhm_ctx.K); } else #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) if (key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; size_t zlen; if ((ret = mbedtls_ecdh_calc_secret(&ssl->handshake->ecdh_ctx, &zlen, p + 2, end - (p + 2), ssl->conf->f_rng, ssl->conf->p_rng)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ecdh_calc_secret", ret); return ret; } MBEDTLS_PUT_UINT16_BE(zlen, p, 0); p += 2 + zlen; MBEDTLS_SSL_DEBUG_ECDH(3, &ssl->handshake->ecdh_ctx, MBEDTLS_DEBUG_ECDH_Z); } else #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } /* opaque psk<0..2^16-1>; */ if (end - p < 2) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } MBEDTLS_PUT_UINT16_BE(psk_len, p, 0); p += 2; if (end < p || (size_t) (end - p) < psk_len) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } memcpy(p, psk, psk_len); p += psk_len; ssl->handshake->pmslen = p - ssl->handshake->premaster; return 0; } #endif /* !MBEDTLS_USE_PSA_CRYPTO && MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_write_hello_request(mbedtls_ssl_context *ssl); #if defined(MBEDTLS_SSL_PROTO_DTLS) int mbedtls_ssl_resend_hello_request(mbedtls_ssl_context *ssl) { /* If renegotiation is not enforced, retransmit until we would reach max * timeout if we were using the usual handshake doubling scheme */ if (ssl->conf->renego_max_records < 0) { uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1; unsigned char doublings = 1; while (ratio != 0) { ++doublings; ratio >>= 1; } if (++ssl->renego_records_seen > doublings) { MBEDTLS_SSL_DEBUG_MSG(2, ("no longer retransmitting hello request")); return 0; } } return ssl_write_hello_request(ssl); } #endif #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ /* * Handshake functions */ #if !defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) /* No certificate support -> dummy functions */ int mbedtls_ssl_write_certificate(mbedtls_ssl_context *ssl) { const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; MBEDTLS_SSL_DEBUG_MSG(2, ("=> write certificate")); if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate")); ssl->state++; return 0; } MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } int mbedtls_ssl_parse_certificate(mbedtls_ssl_context *ssl) { const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse certificate")); if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip parse certificate")); ssl->state++; return 0; } MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } #else /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ /* Some certificate support -> implement write and parse */ int mbedtls_ssl_write_certificate(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; size_t i, n; const mbedtls_x509_crt *crt; const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; MBEDTLS_SSL_DEBUG_MSG(2, ("=> write certificate")); if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate")); ssl->state++; return 0; } #if defined(MBEDTLS_SSL_CLI_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { if (ssl->handshake->client_auth == 0) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate")); ssl->state++; return 0; } } #endif /* MBEDTLS_SSL_CLI_C */ #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { if (mbedtls_ssl_own_cert(ssl) == NULL) { /* Should never happen because we shouldn't have picked the * ciphersuite if we don't have a certificate. */ return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } } #endif MBEDTLS_SSL_DEBUG_CRT(3, "own certificate", mbedtls_ssl_own_cert(ssl)); /* * 0 . 0 handshake type * 1 . 3 handshake length * 4 . 6 length of all certs * 7 . 9 length of cert. 1 * 10 . n-1 peer certificate * n . n+2 length of cert. 2 * n+3 . ... upper level cert, etc. */ i = 7; crt = mbedtls_ssl_own_cert(ssl); while (crt != NULL) { n = crt->raw.len; if (n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i) { MBEDTLS_SSL_DEBUG_MSG(1, ("certificate too large, %" MBEDTLS_PRINTF_SIZET " > %" MBEDTLS_PRINTF_SIZET, i + 3 + n, (size_t) MBEDTLS_SSL_OUT_CONTENT_LEN)); return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL; } ssl->out_msg[i] = MBEDTLS_BYTE_2(n); ssl->out_msg[i + 1] = MBEDTLS_BYTE_1(n); ssl->out_msg[i + 2] = MBEDTLS_BYTE_0(n); i += 3; memcpy(ssl->out_msg + i, crt->raw.p, n); i += n; crt = crt->next; } ssl->out_msg[4] = MBEDTLS_BYTE_2(i - 7); ssl->out_msg[5] = MBEDTLS_BYTE_1(i - 7); ssl->out_msg[6] = MBEDTLS_BYTE_0(i - 7); ssl->out_msglen = i; ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE; ssl->state++; if ((ret = mbedtls_ssl_write_handshake_msg(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_write_handshake_msg", ret); return ret; } MBEDTLS_SSL_DEBUG_MSG(2, ("<= write certificate")); return ret; } #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_check_peer_crt_unchanged(mbedtls_ssl_context *ssl, unsigned char *crt_buf, size_t crt_buf_len) { mbedtls_x509_crt const * const peer_crt = ssl->session->peer_cert; if (peer_crt == NULL) { return -1; } if (peer_crt->raw.len != crt_buf_len) { return -1; } return memcmp(peer_crt->raw.p, crt_buf, peer_crt->raw.len); } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_check_peer_crt_unchanged(mbedtls_ssl_context *ssl, unsigned char *crt_buf, size_t crt_buf_len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; unsigned char const * const peer_cert_digest = ssl->session->peer_cert_digest; mbedtls_md_type_t const peer_cert_digest_type = ssl->session->peer_cert_digest_type; mbedtls_md_info_t const * const digest_info = mbedtls_md_info_from_type(peer_cert_digest_type); unsigned char tmp_digest[MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN]; size_t digest_len; if (peer_cert_digest == NULL || digest_info == NULL) { return -1; } digest_len = mbedtls_md_get_size(digest_info); if (digest_len > MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN) { return -1; } ret = mbedtls_md(digest_info, crt_buf, crt_buf_len, tmp_digest); if (ret != 0) { return -1; } return memcmp(tmp_digest, peer_cert_digest, digest_len); } #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ /* * Once the certificate message is read, parse it into a cert chain and * perform basic checks, but leave actual verification to the caller */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_parse_certificate_chain(mbedtls_ssl_context *ssl, mbedtls_x509_crt *chain) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) int crt_cnt = 0; #endif size_t i, n; uint8_t alert; if (ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE); return MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE; } if (ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE) { mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE); return MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE; } if (ssl->in_hslen < mbedtls_ssl_hs_hdr_len(ssl) + 3 + 3) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); return MBEDTLS_ERR_SSL_DECODE_ERROR; } i = mbedtls_ssl_hs_hdr_len(ssl); /* * Same message structure as in mbedtls_ssl_write_certificate() */ n = (ssl->in_msg[i+1] << 8) | ssl->in_msg[i+2]; if (ssl->in_msg[i] != 0 || ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len(ssl)) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); return MBEDTLS_ERR_SSL_DECODE_ERROR; } /* Make &ssl->in_msg[i] point to the beginning of the CRT chain. */ i += 3; /* Iterate through and parse the CRTs in the provided chain. */ while (i < ssl->in_hslen) { /* Check that there's room for the next CRT's length fields. */ if (i + 3 > ssl->in_hslen) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); return MBEDTLS_ERR_SSL_DECODE_ERROR; } /* In theory, the CRT can be up to 2**24 Bytes, but we don't support * anything beyond 2**16 ~ 64K. */ if (ssl->in_msg[i] != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT); return MBEDTLS_ERR_SSL_BAD_CERTIFICATE; } /* Read length of the next CRT in the chain. */ n = ((unsigned int) ssl->in_msg[i + 1] << 8) | (unsigned int) ssl->in_msg[i + 2]; i += 3; if (n < 128 || i + n > ssl->in_hslen) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); return MBEDTLS_ERR_SSL_DECODE_ERROR; } /* Check if we're handling the first CRT in the chain. */ #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) if (crt_cnt++ == 0 && ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) { /* During client-side renegotiation, check that the server's * end-CRTs hasn't changed compared to the initial handshake, * mitigating the triple handshake attack. On success, reuse * the original end-CRT instead of parsing it again. */ MBEDTLS_SSL_DEBUG_MSG(3, ("Check that peer CRT hasn't changed during renegotiation")); if (ssl_check_peer_crt_unchanged(ssl, &ssl->in_msg[i], n) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("new server cert during renegotiation")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED); return MBEDTLS_ERR_SSL_BAD_CERTIFICATE; } /* Now we can safely free the original chain. */ ssl_clear_peer_cert(ssl->session); } #endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ /* Parse the next certificate in the chain. */ #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) ret = mbedtls_x509_crt_parse_der(chain, ssl->in_msg + i, n); #else /* If we don't need to store the CRT chain permanently, parse * it in-place from the input buffer instead of making a copy. */ ret = mbedtls_x509_crt_parse_der_nocopy(chain, ssl->in_msg + i, n); #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ switch (ret) { case 0: /*ok*/ case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND: /* Ignore certificate with an unknown algorithm: maybe a prior certificate was already trusted. */ break; case MBEDTLS_ERR_X509_ALLOC_FAILED: alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR; goto crt_parse_der_failed; case MBEDTLS_ERR_X509_UNKNOWN_VERSION: alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; goto crt_parse_der_failed; default: alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; crt_parse_der_failed: mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert); MBEDTLS_SSL_DEBUG_RET(1, " mbedtls_x509_crt_parse_der", ret); return ret; } i += n; } MBEDTLS_SSL_DEBUG_CRT(3, "peer certificate", chain); return 0; } #if defined(MBEDTLS_SSL_SRV_C) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_srv_check_client_no_crt_notification(mbedtls_ssl_context *ssl) { if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { return -1; } if (ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len(ssl) && ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE && memcmp(ssl->in_msg + mbedtls_ssl_hs_hdr_len(ssl), "\0\0\0", 3) == 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("peer has no certificate")); return 0; } return -1; } #endif /* MBEDTLS_SSL_SRV_C */ /* Check if a certificate message is expected. * Return either * - SSL_CERTIFICATE_EXPECTED, or * - SSL_CERTIFICATE_SKIP * indicating whether a Certificate message is expected or not. */ #define SSL_CERTIFICATE_EXPECTED 0 #define SSL_CERTIFICATE_SKIP 1 MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_parse_certificate_coordinate(mbedtls_ssl_context *ssl, int authmode) { const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) { return SSL_CERTIFICATE_SKIP; } #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { if (ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK) { return SSL_CERTIFICATE_SKIP; } if (authmode == MBEDTLS_SSL_VERIFY_NONE) { ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY; return SSL_CERTIFICATE_SKIP; } } #else ((void) authmode); #endif /* MBEDTLS_SSL_SRV_C */ return SSL_CERTIFICATE_EXPECTED; } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_parse_certificate_verify(mbedtls_ssl_context *ssl, int authmode, mbedtls_x509_crt *chain, void *rs_ctx) { int ret = 0; const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->handshake->ciphersuite_info; int have_ca_chain = 0; int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *); void *p_vrfy; if (authmode == MBEDTLS_SSL_VERIFY_NONE) { return 0; } if (ssl->f_vrfy != NULL) { MBEDTLS_SSL_DEBUG_MSG(3, ("Use context-specific verification callback")); f_vrfy = ssl->f_vrfy; p_vrfy = ssl->p_vrfy; } else { MBEDTLS_SSL_DEBUG_MSG(3, ("Use configuration-specific verification callback")); f_vrfy = ssl->conf->f_vrfy; p_vrfy = ssl->conf->p_vrfy; } /* * Main check: verify certificate */ #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) if (ssl->conf->f_ca_cb != NULL) { ((void) rs_ctx); have_ca_chain = 1; MBEDTLS_SSL_DEBUG_MSG(3, ("use CA callback for X.509 CRT verification")); ret = mbedtls_x509_crt_verify_with_ca_cb( chain, ssl->conf->f_ca_cb, ssl->conf->p_ca_cb, ssl->conf->cert_profile, ssl->hostname, &ssl->session_negotiate->verify_result, f_vrfy, p_vrfy); } else #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ { mbedtls_x509_crt *ca_chain; mbedtls_x509_crl *ca_crl; #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) if (ssl->handshake->sni_ca_chain != NULL) { ca_chain = ssl->handshake->sni_ca_chain; ca_crl = ssl->handshake->sni_ca_crl; } else #endif { ca_chain = ssl->conf->ca_chain; ca_crl = ssl->conf->ca_crl; } if (ca_chain != NULL) { have_ca_chain = 1; } ret = mbedtls_x509_crt_verify_restartable( chain, ca_chain, ca_crl, ssl->conf->cert_profile, ssl->hostname, &ssl->session_negotiate->verify_result, f_vrfy, p_vrfy, rs_ctx); } if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "x509_verify_cert", ret); } #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) if (ret == MBEDTLS_ERR_ECP_IN_PROGRESS) { return MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; } #endif /* * Secondary checks: always done, but change 'ret' only if it was 0 */ #if defined(MBEDTLS_ECP_C) { const mbedtls_pk_context *pk = &chain->pk; /* If certificate uses an EC key, make sure the curve is OK. * This is a public key, so it can't be opaque, so can_do() is a good * enough check to ensure pk_ec() is safe to use here. */ if (mbedtls_pk_can_do(pk, MBEDTLS_PK_ECKEY)) { /* and in the unlikely case the above assumption no longer holds * we are making sure that pk_ec() here does not return a NULL */ const mbedtls_ecp_keypair *ec = mbedtls_pk_ec(*pk); if (ec == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("mbedtls_pk_ec() returned NULL")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } if (mbedtls_ssl_check_curve(ssl, ec->grp.id) != 0) { ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY; MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate (EC key curve)")); if (ret == 0) { ret = MBEDTLS_ERR_SSL_BAD_CERTIFICATE; } } } } #endif /* MBEDTLS_ECP_C */ if (mbedtls_ssl_check_cert_usage(chain, ciphersuite_info, !ssl->conf->endpoint, &ssl->session_negotiate->verify_result) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate (usage extensions)")); if (ret == 0) { ret = MBEDTLS_ERR_SSL_BAD_CERTIFICATE; } } /* mbedtls_x509_crt_verify_with_profile is supposed to report a * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED, * with details encoded in the verification flags. All other kinds * of error codes, including those from the user provided f_vrfy * functions, are treated as fatal and lead to a failure of * ssl_parse_certificate even if verification was optional. */ if (authmode == MBEDTLS_SSL_VERIFY_OPTIONAL && (ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED || ret == MBEDTLS_ERR_SSL_BAD_CERTIFICATE)) { ret = 0; } if (have_ca_chain == 0 && authmode == MBEDTLS_SSL_VERIFY_REQUIRED) { MBEDTLS_SSL_DEBUG_MSG(1, ("got no CA chain")); ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED; } if (ret != 0) { uint8_t alert; /* The certificate may have been rejected for several reasons. Pick one and send the corresponding alert. Which alert to send may be a subject of debate in some cases. */ if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER) { alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH) { alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY) { alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED) { alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED) { alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED; } else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED) { alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA; } else { alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN; } mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert); } #if defined(MBEDTLS_DEBUG_C) if (ssl->session_negotiate->verify_result != 0) { MBEDTLS_SSL_DEBUG_MSG(3, ("! Certificate verification flags %08x", (unsigned int) ssl->session_negotiate->verify_result)); } else { MBEDTLS_SSL_DEBUG_MSG(3, ("Certificate verification flags clear")); } #endif /* MBEDTLS_DEBUG_C */ return ret; } #if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_remember_peer_crt_digest(mbedtls_ssl_context *ssl, unsigned char *start, size_t len) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* Remember digest of the peer's end-CRT. */ ssl->session_negotiate->peer_cert_digest = mbedtls_calloc(1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN); if (ssl->session_negotiate->peer_cert_digest == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%d bytes) failed", MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN)); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR); return MBEDTLS_ERR_SSL_ALLOC_FAILED; } ret = mbedtls_md(mbedtls_md_info_from_type( MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE), start, len, ssl->session_negotiate->peer_cert_digest); ssl->session_negotiate->peer_cert_digest_type = MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE; ssl->session_negotiate->peer_cert_digest_len = MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN; return ret; } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_remember_peer_pubkey(mbedtls_ssl_context *ssl, unsigned char *start, size_t len) { unsigned char *end = start + len; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; /* Make a copy of the peer's raw public key. */ mbedtls_pk_init(&ssl->handshake->peer_pubkey); ret = mbedtls_pk_parse_subpubkey(&start, end, &ssl->handshake->peer_pubkey); if (ret != 0) { /* We should have parsed the public key before. */ return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } return 0; } #endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ int mbedtls_ssl_parse_certificate(mbedtls_ssl_context *ssl) { int ret = 0; int crt_expected; #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET ? ssl->handshake->sni_authmode : ssl->conf->authmode; #else const int authmode = ssl->conf->authmode; #endif void *rs_ctx = NULL; mbedtls_x509_crt *chain = NULL; MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse certificate")); crt_expected = ssl_parse_certificate_coordinate(ssl, authmode); if (crt_expected == SSL_CERTIFICATE_SKIP) { MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip parse certificate")); goto exit; } #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) if (ssl->handshake->ecrs_enabled && ssl->handshake->ecrs_state == ssl_ecrs_crt_verify) { chain = ssl->handshake->ecrs_peer_cert; ssl->handshake->ecrs_peer_cert = NULL; goto crt_verify; } #endif if ((ret = mbedtls_ssl_read_record(ssl, 1)) != 0) { /* mbedtls_ssl_read_record may have sent an alert already. We let it decide whether to alert. */ MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_read_record", ret); goto exit; } #if defined(MBEDTLS_SSL_SRV_C) if (ssl_srv_check_client_no_crt_notification(ssl) == 0) { ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; if (authmode != MBEDTLS_SSL_VERIFY_OPTIONAL) { ret = MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE; } goto exit; } #endif /* MBEDTLS_SSL_SRV_C */ /* Clear existing peer CRT structure in case we tried to * reuse a session but it failed, and allocate a new one. */ ssl_clear_peer_cert(ssl->session_negotiate); chain = mbedtls_calloc(1, sizeof(mbedtls_x509_crt)); if (chain == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", sizeof(mbedtls_x509_crt))); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR); ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; goto exit; } mbedtls_x509_crt_init(chain); ret = ssl_parse_certificate_chain(ssl, chain); if (ret != 0) { goto exit; } #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) if (ssl->handshake->ecrs_enabled) { ssl->handshake->ecrs_state = ssl_ecrs_crt_verify; } crt_verify: if (ssl->handshake->ecrs_enabled) { rs_ctx = &ssl->handshake->ecrs_ctx; } #endif ret = ssl_parse_certificate_verify(ssl, authmode, chain, rs_ctx); if (ret != 0) { goto exit; } #if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) { unsigned char *crt_start, *pk_start; size_t crt_len, pk_len; /* We parse the CRT chain without copying, so * these pointers point into the input buffer, * and are hence still valid after freeing the * CRT chain. */ crt_start = chain->raw.p; crt_len = chain->raw.len; pk_start = chain->pk_raw.p; pk_len = chain->pk_raw.len; /* Free the CRT structures before computing * digest and copying the peer's public key. */ mbedtls_x509_crt_free(chain); mbedtls_free(chain); chain = NULL; ret = ssl_remember_peer_crt_digest(ssl, crt_start, crt_len); if (ret != 0) { goto exit; } ret = ssl_remember_peer_pubkey(ssl, pk_start, pk_len); if (ret != 0) { goto exit; } } #else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ /* Pass ownership to session structure. */ ssl->session_negotiate->peer_cert = chain; chain = NULL; #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ MBEDTLS_SSL_DEBUG_MSG(2, ("<= parse certificate")); exit: if (ret == 0) { ssl->state++; } #if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED) if (ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS) { ssl->handshake->ecrs_peer_cert = chain; chain = NULL; } #endif if (chain != NULL) { mbedtls_x509_crt_free(chain); mbedtls_free(chain); } return ret; } #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_MD_CAN_SHA256) static int ssl_calc_finished_tls_sha256( mbedtls_ssl_context *ssl, unsigned char *buf, int from) { int len = 12; const char *sender; unsigned char padbuf[32]; #if defined(MBEDTLS_USE_PSA_CRYPTO) size_t hash_size; psa_hash_operation_t sha256_psa = PSA_HASH_OPERATION_INIT; psa_status_t status; #else int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md_context_t sha256; #endif mbedtls_ssl_session *session = ssl->session_negotiate; if (!session) { session = ssl->session; } sender = (from == MBEDTLS_SSL_IS_CLIENT) ? "client finished" : "server finished"; #if defined(MBEDTLS_USE_PSA_CRYPTO) sha256_psa = psa_hash_operation_init(); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc PSA finished tls sha256")); status = psa_hash_clone(&ssl->handshake->fin_sha256_psa, &sha256_psa); if (status != PSA_SUCCESS) { goto exit; } status = psa_hash_finish(&sha256_psa, padbuf, sizeof(padbuf), &hash_size); if (status != PSA_SUCCESS) { goto exit; } MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated padbuf", padbuf, 32); #else mbedtls_md_init(&sha256); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished tls sha256")); ret = mbedtls_md_setup(&sha256, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), 0); if (ret != 0) { goto exit; } ret = mbedtls_md_clone(&sha256, &ssl->handshake->fin_sha256); if (ret != 0) { goto exit; } /* * TLSv1.2: * hash = PRF( master, finished_label, * Hash( handshake ) )[0.11] */ ret = mbedtls_md_finish(&sha256, padbuf); if (ret != 0) { goto exit; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ MBEDTLS_SSL_DEBUG_BUF(4, "finished sha256 output", padbuf, 32); ssl->handshake->tls_prf(session->master, 48, sender, padbuf, 32, buf, len); MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, len); mbedtls_platform_zeroize(padbuf, sizeof(padbuf)); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished")); exit: #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort(&sha256_psa); return PSA_TO_MD_ERR(status); #else mbedtls_md_free(&sha256); return ret; #endif /* MBEDTLS_USE_PSA_CRYPTO */ } #endif /* MBEDTLS_MD_CAN_SHA256*/ #if defined(MBEDTLS_MD_CAN_SHA384) static int ssl_calc_finished_tls_sha384( mbedtls_ssl_context *ssl, unsigned char *buf, int from) { int len = 12; const char *sender; unsigned char padbuf[48]; #if defined(MBEDTLS_USE_PSA_CRYPTO) size_t hash_size; psa_hash_operation_t sha384_psa = PSA_HASH_OPERATION_INIT; psa_status_t status; #else int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md_context_t sha384; #endif mbedtls_ssl_session *session = ssl->session_negotiate; if (!session) { session = ssl->session; } sender = (from == MBEDTLS_SSL_IS_CLIENT) ? "client finished" : "server finished"; #if defined(MBEDTLS_USE_PSA_CRYPTO) sha384_psa = psa_hash_operation_init(); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc PSA finished tls sha384")); status = psa_hash_clone(&ssl->handshake->fin_sha384_psa, &sha384_psa); if (status != PSA_SUCCESS) { goto exit; } status = psa_hash_finish(&sha384_psa, padbuf, sizeof(padbuf), &hash_size); if (status != PSA_SUCCESS) { goto exit; } MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated padbuf", padbuf, 48); #else mbedtls_md_init(&sha384); MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished tls sha384")); ret = mbedtls_md_setup(&sha384, mbedtls_md_info_from_type(MBEDTLS_MD_SHA384), 0); if (ret != 0) { goto exit; } ret = mbedtls_md_clone(&sha384, &ssl->handshake->fin_sha384); if (ret != 0) { goto exit; } /* * TLSv1.2: * hash = PRF( master, finished_label, * Hash( handshake ) )[0.11] */ ret = mbedtls_md_finish(&sha384, padbuf); if (ret != 0) { goto exit; } #endif MBEDTLS_SSL_DEBUG_BUF(4, "finished sha384 output", padbuf, 48); ssl->handshake->tls_prf(session->master, 48, sender, padbuf, 48, buf, len); MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, len); mbedtls_platform_zeroize(padbuf, sizeof(padbuf)); MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished")); exit: #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort(&sha384_psa); return PSA_TO_MD_ERR(status); #else mbedtls_md_free(&sha384); return ret; #endif /* MBEDTLS_USE_PSA_CRYPTO */ } #endif /* MBEDTLS_MD_CAN_SHA384*/ void mbedtls_ssl_handshake_wrapup_free_hs_transform(mbedtls_ssl_context *ssl) { MBEDTLS_SSL_DEBUG_MSG(3, ("=> handshake wrapup: final free")); /* * Free our handshake params */ mbedtls_ssl_handshake_free(ssl); mbedtls_free(ssl->handshake); ssl->handshake = NULL; /* * Free the previous transform and switch in the current one */ if (ssl->transform) { mbedtls_ssl_transform_free(ssl->transform); mbedtls_free(ssl->transform); } ssl->transform = ssl->transform_negotiate; ssl->transform_negotiate = NULL; MBEDTLS_SSL_DEBUG_MSG(3, ("<= handshake wrapup: final free")); } void mbedtls_ssl_handshake_wrapup(mbedtls_ssl_context *ssl) { int resume = ssl->handshake->resume; MBEDTLS_SSL_DEBUG_MSG(3, ("=> handshake wrapup")); #if defined(MBEDTLS_SSL_RENEGOTIATION) if (ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) { ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE; ssl->renego_records_seen = 0; } #endif /* * Free the previous session and switch in the current one */ if (ssl->session) { #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) /* RFC 7366 3.1: keep the EtM state */ ssl->session_negotiate->encrypt_then_mac = ssl->session->encrypt_then_mac; #endif mbedtls_ssl_session_free(ssl->session); mbedtls_free(ssl->session); } ssl->session = ssl->session_negotiate; ssl->session_negotiate = NULL; /* * Add cache entry */ if (ssl->conf->f_set_cache != NULL && ssl->session->id_len != 0 && resume == 0) { if (ssl->conf->f_set_cache(ssl->conf->p_cache, ssl->session->id, ssl->session->id_len, ssl->session) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("cache did not store session")); } } #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && ssl->handshake->flight != NULL) { /* Cancel handshake timer */ mbedtls_ssl_set_timer(ssl, 0); /* Keep last flight around in case we need to resend it: * we need the handshake and transform structures for that */ MBEDTLS_SSL_DEBUG_MSG(3, ("skip freeing handshake and transform")); } else #endif mbedtls_ssl_handshake_wrapup_free_hs_transform(ssl); ssl->state = MBEDTLS_SSL_HANDSHAKE_OVER; MBEDTLS_SSL_DEBUG_MSG(3, ("<= handshake wrapup")); } int mbedtls_ssl_write_finished(mbedtls_ssl_context *ssl) { int ret, hash_len; MBEDTLS_SSL_DEBUG_MSG(2, ("=> write finished")); mbedtls_ssl_update_out_pointers(ssl, ssl->transform_negotiate); ret = ssl->handshake->calc_finished(ssl, ssl->out_msg + 4, ssl->conf->endpoint); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "calc_finished", ret); } /* * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites * may define some other value. Currently (early 2016), no defined * ciphersuite does this (and this is unlikely to change as activity has * moved to TLS 1.3 now) so we can keep the hardcoded 12 here. */ hash_len = 12; #if defined(MBEDTLS_SSL_RENEGOTIATION) ssl->verify_data_len = hash_len; memcpy(ssl->own_verify_data, ssl->out_msg + 4, hash_len); #endif ssl->out_msglen = 4 + hash_len; ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED; /* * In case of session resuming, invert the client and server * ChangeCipherSpec messages order. */ if (ssl->handshake->resume != 0) { #if defined(MBEDTLS_SSL_CLI_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; } #endif #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; } #endif } else { ssl->state++; } /* * Switch to our negotiated transform and session parameters for outbound * data. */ MBEDTLS_SSL_DEBUG_MSG(3, ("switching to new transform spec for outbound data")); #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { unsigned char i; /* Remember current epoch settings for resending */ ssl->handshake->alt_transform_out = ssl->transform_out; memcpy(ssl->handshake->alt_out_ctr, ssl->cur_out_ctr, sizeof(ssl->handshake->alt_out_ctr)); /* Set sequence_number to zero */ memset(&ssl->cur_out_ctr[2], 0, sizeof(ssl->cur_out_ctr) - 2); /* Increment epoch */ for (i = 2; i > 0; i--) { if (++ssl->cur_out_ctr[i - 1] != 0) { break; } } /* The loop goes to its end iff the counter is wrapping */ if (i == 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("DTLS epoch would wrap")); return MBEDTLS_ERR_SSL_COUNTER_WRAPPING; } } else #endif /* MBEDTLS_SSL_PROTO_DTLS */ memset(ssl->cur_out_ctr, 0, sizeof(ssl->cur_out_ctr)); ssl->transform_out = ssl->transform_negotiate; ssl->session_out = ssl->session_negotiate; #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { mbedtls_ssl_send_flight_completed(ssl); } #endif if ((ret = mbedtls_ssl_write_handshake_msg(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_write_handshake_msg", ret); return ret; } #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && (ret = mbedtls_ssl_flight_transmit(ssl)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_flight_transmit", ret); return ret; } #endif MBEDTLS_SSL_DEBUG_MSG(2, ("<= write finished")); return 0; } #define SSL_MAX_HASH_LEN 12 int mbedtls_ssl_parse_finished(mbedtls_ssl_context *ssl) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; unsigned int hash_len = 12; unsigned char buf[SSL_MAX_HASH_LEN]; MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse finished")); ret = ssl->handshake->calc_finished(ssl, buf, ssl->conf->endpoint ^ 1); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "calc_finished", ret); } if ((ret = mbedtls_ssl_read_record(ssl, 1)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_read_record", ret); goto exit; } if (ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad finished message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE); ret = MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE; goto exit; } if (ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED) { mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE); ret = MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE; goto exit; } if (ssl->in_hslen != mbedtls_ssl_hs_hdr_len(ssl) + hash_len) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad finished message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR); ret = MBEDTLS_ERR_SSL_DECODE_ERROR; goto exit; } if (mbedtls_ct_memcmp(ssl->in_msg + mbedtls_ssl_hs_hdr_len(ssl), buf, hash_len) != 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("bad finished message")); mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR); ret = MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; goto exit; } #if defined(MBEDTLS_SSL_RENEGOTIATION) ssl->verify_data_len = hash_len; memcpy(ssl->peer_verify_data, buf, hash_len); #endif if (ssl->handshake->resume != 0) { #if defined(MBEDTLS_SSL_CLI_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) { ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; } #endif #if defined(MBEDTLS_SSL_SRV_C) if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) { ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; } #endif } else { ssl->state++; } #if defined(MBEDTLS_SSL_PROTO_DTLS) if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) { mbedtls_ssl_recv_flight_completed(ssl); } #endif MBEDTLS_SSL_DEBUG_MSG(2, ("<= parse finished")); exit: mbedtls_platform_zeroize(buf, hash_len); return ret; } #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) /* * Helper to get TLS 1.2 PRF from ciphersuite * (Duplicates bits of logic from ssl_set_handshake_prfs().) */ static tls_prf_fn ssl_tls12prf_from_cs(int ciphersuite_id) { const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = mbedtls_ssl_ciphersuite_from_id(ciphersuite_id); #if defined(MBEDTLS_MD_CAN_SHA384) if (ciphersuite_info != NULL && ciphersuite_info->mac == MBEDTLS_MD_SHA384) { return tls_prf_sha384; } else #endif #if defined(MBEDTLS_MD_CAN_SHA256) { if (ciphersuite_info != NULL && ciphersuite_info->mac == MBEDTLS_MD_SHA256) { return tls_prf_sha256; } } #endif #if !defined(MBEDTLS_MD_CAN_SHA384) && \ !defined(MBEDTLS_MD_CAN_SHA256) (void) ciphersuite_info; #endif return NULL; } #endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */ static mbedtls_tls_prf_types tls_prf_get_type(mbedtls_ssl_tls_prf_cb *tls_prf) { ((void) tls_prf); #if defined(MBEDTLS_MD_CAN_SHA384) if (tls_prf == tls_prf_sha384) { return MBEDTLS_SSL_TLS_PRF_SHA384; } else #endif #if defined(MBEDTLS_MD_CAN_SHA256) if (tls_prf == tls_prf_sha256) { return MBEDTLS_SSL_TLS_PRF_SHA256; } else #endif return MBEDTLS_SSL_TLS_PRF_NONE; } /* * Populate a transform structure with session keys and all the other * necessary information. * * Parameters: * - [in/out]: transform: structure to populate * [in] must be just initialised with mbedtls_ssl_transform_init() * [out] fully populated, ready for use by mbedtls_ssl_{en,de}crypt_buf() * - [in] ciphersuite * - [in] master * - [in] encrypt_then_mac * - [in] tls_prf: pointer to PRF to use for key derivation * - [in] randbytes: buffer holding ServerHello.random + ClientHello.random * - [in] tls_version: TLS version * - [in] endpoint: client or server * - [in] ssl: used for: * - ssl->conf->{f,p}_export_keys * [in] optionally used for: * - MBEDTLS_DEBUG_C: ssl->conf->{f,p}_dbg */ MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_tls12_populate_transform(mbedtls_ssl_transform *transform, int ciphersuite, const unsigned char master[48], #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) int encrypt_then_mac, #endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */ ssl_tls_prf_t tls_prf, const unsigned char randbytes[64], mbedtls_ssl_protocol_version tls_version, unsigned endpoint, const mbedtls_ssl_context *ssl) { int ret = 0; unsigned char keyblk[256]; unsigned char *key1; unsigned char *key2; unsigned char *mac_enc; unsigned char *mac_dec; size_t mac_key_len = 0; size_t iv_copy_len; size_t keylen; const mbedtls_ssl_ciphersuite_t *ciphersuite_info; mbedtls_ssl_mode_t ssl_mode; #if !defined(MBEDTLS_USE_PSA_CRYPTO) const mbedtls_cipher_info_t *cipher_info; const mbedtls_md_info_t *md_info; #endif /* !MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_key_type_t key_type; psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; psa_algorithm_t alg; psa_algorithm_t mac_alg = 0; size_t key_bits; psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED; #endif #if !defined(MBEDTLS_DEBUG_C) && \ !defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) if (ssl->f_export_keys == NULL) { ssl = NULL; /* make sure we don't use it except for these cases */ (void) ssl; } #endif /* * Some data just needs copying into the structure */ #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) transform->encrypt_then_mac = encrypt_then_mac; #endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */ transform->tls_version = tls_version; #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) memcpy(transform->randbytes, randbytes, sizeof(transform->randbytes)); #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_3) if (tls_version == MBEDTLS_SSL_VERSION_TLS1_3) { /* At the moment, we keep TLS <= 1.2 and TLS 1.3 transform * generation separate. This should never happen. */ return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ /* * Get various info structures */ ciphersuite_info = mbedtls_ssl_ciphersuite_from_id(ciphersuite); if (ciphersuite_info == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("ciphersuite info for %d not found", ciphersuite)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } ssl_mode = mbedtls_ssl_get_mode_from_ciphersuite( #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) encrypt_then_mac, #endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */ ciphersuite_info); if (ssl_mode == MBEDTLS_SSL_MODE_AEAD) { transform->taglen = ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; } #if defined(MBEDTLS_USE_PSA_CRYPTO) if ((status = mbedtls_ssl_cipher_to_psa(ciphersuite_info->cipher, transform->taglen, &alg, &key_type, &key_bits)) != PSA_SUCCESS) { ret = PSA_TO_MBEDTLS_ERR(status); MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_cipher_to_psa", ret); goto end; } #else cipher_info = mbedtls_cipher_info_from_type(ciphersuite_info->cipher); if (cipher_info == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("cipher info for %u not found", ciphersuite_info->cipher)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_USE_PSA_CRYPTO) mac_alg = mbedtls_hash_info_psa_from_md(ciphersuite_info->mac); if (mac_alg == 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("mbedtls_hash_info_psa_from_md for %u not found", (unsigned) ciphersuite_info->mac)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #else md_info = mbedtls_md_info_from_type(ciphersuite_info->mac); if (md_info == NULL) { MBEDTLS_SSL_DEBUG_MSG(1, ("mbedtls_md info for %u not found", (unsigned) ciphersuite_info->mac)); return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) /* Copy own and peer's CID if the use of the CID * extension has been negotiated. */ if (ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_ENABLED) { MBEDTLS_SSL_DEBUG_MSG(3, ("Copy CIDs into SSL transform")); transform->in_cid_len = ssl->own_cid_len; memcpy(transform->in_cid, ssl->own_cid, ssl->own_cid_len); MBEDTLS_SSL_DEBUG_BUF(3, "Incoming CID", transform->in_cid, transform->in_cid_len); transform->out_cid_len = ssl->handshake->peer_cid_len; memcpy(transform->out_cid, ssl->handshake->peer_cid, ssl->handshake->peer_cid_len); MBEDTLS_SSL_DEBUG_BUF(3, "Outgoing CID", transform->out_cid, transform->out_cid_len); } #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ /* * Compute key block using the PRF */ ret = tls_prf(master, 48, "key expansion", randbytes, 64, keyblk, 256); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "prf", ret); return ret; } MBEDTLS_SSL_DEBUG_MSG(3, ("ciphersuite = %s", mbedtls_ssl_get_ciphersuite_name(ciphersuite))); MBEDTLS_SSL_DEBUG_BUF(3, "master secret", master, 48); MBEDTLS_SSL_DEBUG_BUF(4, "random bytes", randbytes, 64); MBEDTLS_SSL_DEBUG_BUF(4, "key block", keyblk, 256); /* * Determine the appropriate key, IV and MAC length. */ #if defined(MBEDTLS_USE_PSA_CRYPTO) keylen = PSA_BITS_TO_BYTES(key_bits); #else keylen = mbedtls_cipher_info_get_key_bitlen(cipher_info) / 8; #endif #if defined(MBEDTLS_GCM_C) || \ defined(MBEDTLS_CCM_C) || \ defined(MBEDTLS_CHACHAPOLY_C) if (ssl_mode == MBEDTLS_SSL_MODE_AEAD) { size_t explicit_ivlen; transform->maclen = 0; mac_key_len = 0; /* All modes haves 96-bit IVs, but the length of the static parts vary * with mode and version: * - For GCM and CCM in TLS 1.2, there's a static IV of 4 Bytes * (to be concatenated with a dynamically chosen IV of 8 Bytes) * - For ChaChaPoly in TLS 1.2, and all modes in TLS 1.3, there's * a static IV of 12 Bytes (to be XOR'ed with the 8 Byte record * sequence number). */ transform->ivlen = 12; int is_chachapoly = 0; #if defined(MBEDTLS_USE_PSA_CRYPTO) is_chachapoly = (key_type == PSA_KEY_TYPE_CHACHA20); #else is_chachapoly = (mbedtls_cipher_info_get_mode(cipher_info) == MBEDTLS_MODE_CHACHAPOLY); #endif /* MBEDTLS_USE_PSA_CRYPTO */ if (is_chachapoly) { transform->fixed_ivlen = 12; } else { transform->fixed_ivlen = 4; } /* Minimum length of encrypted record */ explicit_ivlen = transform->ivlen - transform->fixed_ivlen; transform->minlen = explicit_ivlen + transform->taglen; } else #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C */ #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC) if (ssl_mode == MBEDTLS_SSL_MODE_STREAM || ssl_mode == MBEDTLS_SSL_MODE_CBC || ssl_mode == MBEDTLS_SSL_MODE_CBC_ETM) { #if defined(MBEDTLS_USE_PSA_CRYPTO) size_t block_size = PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type); #else size_t block_size = cipher_info->block_size; #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_USE_PSA_CRYPTO) /* Get MAC length */ mac_key_len = PSA_HASH_LENGTH(mac_alg); #else /* Initialize HMAC contexts */ if ((ret = mbedtls_md_setup(&transform->md_ctx_enc, md_info, 1)) != 0 || (ret = mbedtls_md_setup(&transform->md_ctx_dec, md_info, 1)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_setup", ret); goto end; } /* Get MAC length */ mac_key_len = mbedtls_md_get_size(md_info); #endif /* MBEDTLS_USE_PSA_CRYPTO */ transform->maclen = mac_key_len; /* IV length */ #if defined(MBEDTLS_USE_PSA_CRYPTO) transform->ivlen = PSA_CIPHER_IV_LENGTH(key_type, alg); #else transform->ivlen = cipher_info->iv_size; #endif /* MBEDTLS_USE_PSA_CRYPTO */ /* Minimum length */ if (ssl_mode == MBEDTLS_SSL_MODE_STREAM) { transform->minlen = transform->maclen; } else { /* * GenericBlockCipher: * 1. if EtM is in use: one block plus MAC * otherwise: * first multiple of blocklen greater than maclen * 2. IV */ #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) if (ssl_mode == MBEDTLS_SSL_MODE_CBC_ETM) { transform->minlen = transform->maclen + block_size; } else #endif { transform->minlen = transform->maclen + block_size - transform->maclen % block_size; } if (tls_version == MBEDTLS_SSL_VERSION_TLS1_2) { transform->minlen += transform->ivlen; } else { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; goto end; } } } else #endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */ { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } MBEDTLS_SSL_DEBUG_MSG(3, ("keylen: %u, minlen: %u, ivlen: %u, maclen: %u", (unsigned) keylen, (unsigned) transform->minlen, (unsigned) transform->ivlen, (unsigned) transform->maclen)); /* * Finally setup the cipher contexts, IVs and MAC secrets. */ #if defined(MBEDTLS_SSL_CLI_C) if (endpoint == MBEDTLS_SSL_IS_CLIENT) { key1 = keyblk + mac_key_len * 2; key2 = keyblk + mac_key_len * 2 + keylen; mac_enc = keyblk; mac_dec = keyblk + mac_key_len; iv_copy_len = (transform->fixed_ivlen) ? transform->fixed_ivlen : transform->ivlen; memcpy(transform->iv_enc, key2 + keylen, iv_copy_len); memcpy(transform->iv_dec, key2 + keylen + iv_copy_len, iv_copy_len); } else #endif /* MBEDTLS_SSL_CLI_C */ #if defined(MBEDTLS_SSL_SRV_C) if (endpoint == MBEDTLS_SSL_IS_SERVER) { key1 = keyblk + mac_key_len * 2 + keylen; key2 = keyblk + mac_key_len * 2; mac_enc = keyblk + mac_key_len; mac_dec = keyblk; iv_copy_len = (transform->fixed_ivlen) ? transform->fixed_ivlen : transform->ivlen; memcpy(transform->iv_dec, key1 + keylen, iv_copy_len); memcpy(transform->iv_enc, key1 + keylen + iv_copy_len, iv_copy_len); } else #endif /* MBEDTLS_SSL_SRV_C */ { MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen")); ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; goto end; } if (ssl != NULL && ssl->f_export_keys != NULL) { ssl->f_export_keys(ssl->p_export_keys, MBEDTLS_SSL_KEY_EXPORT_TLS12_MASTER_SECRET, master, 48, randbytes + 32, randbytes, tls_prf_get_type(tls_prf)); } #if defined(MBEDTLS_USE_PSA_CRYPTO) transform->psa_alg = alg; if (alg != MBEDTLS_SSL_NULL_CIPHER) { psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_ENCRYPT); psa_set_key_algorithm(&attributes, alg); psa_set_key_type(&attributes, key_type); if ((status = psa_import_key(&attributes, key1, PSA_BITS_TO_BYTES(key_bits), &transform->psa_key_enc)) != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_RET(3, "psa_import_key", (int) status); ret = PSA_TO_MBEDTLS_ERR(status); MBEDTLS_SSL_DEBUG_RET(1, "psa_import_key", ret); goto end; } psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_DECRYPT); if ((status = psa_import_key(&attributes, key2, PSA_BITS_TO_BYTES(key_bits), &transform->psa_key_dec)) != PSA_SUCCESS) { ret = PSA_TO_MBEDTLS_ERR(status); MBEDTLS_SSL_DEBUG_RET(1, "psa_import_key", ret); goto end; } } #else if ((ret = mbedtls_cipher_setup(&transform->cipher_ctx_enc, cipher_info)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup", ret); goto end; } if ((ret = mbedtls_cipher_setup(&transform->cipher_ctx_dec, cipher_info)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup", ret); goto end; } if ((ret = mbedtls_cipher_setkey(&transform->cipher_ctx_enc, key1, (int) mbedtls_cipher_info_get_key_bitlen(cipher_info), MBEDTLS_ENCRYPT)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setkey", ret); goto end; } if ((ret = mbedtls_cipher_setkey(&transform->cipher_ctx_dec, key2, (int) mbedtls_cipher_info_get_key_bitlen(cipher_info), MBEDTLS_DECRYPT)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setkey", ret); goto end; } #if defined(MBEDTLS_CIPHER_MODE_CBC) if (mbedtls_cipher_info_get_mode(cipher_info) == MBEDTLS_MODE_CBC) { if ((ret = mbedtls_cipher_set_padding_mode(&transform->cipher_ctx_enc, MBEDTLS_PADDING_NONE)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_set_padding_mode", ret); goto end; } if ((ret = mbedtls_cipher_set_padding_mode(&transform->cipher_ctx_dec, MBEDTLS_PADDING_NONE)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_set_padding_mode", ret); goto end; } } #endif /* MBEDTLS_CIPHER_MODE_CBC */ #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC) /* For HMAC-based ciphersuites, initialize the HMAC transforms. For AEAD-based ciphersuites, there is nothing to do here. */ if (mac_key_len != 0) { #if defined(MBEDTLS_USE_PSA_CRYPTO) transform->psa_mac_alg = PSA_ALG_HMAC(mac_alg); psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_SIGN_MESSAGE); psa_set_key_algorithm(&attributes, PSA_ALG_HMAC(mac_alg)); psa_set_key_type(&attributes, PSA_KEY_TYPE_HMAC); if ((status = psa_import_key(&attributes, mac_enc, mac_key_len, &transform->psa_mac_enc)) != PSA_SUCCESS) { ret = PSA_TO_MBEDTLS_ERR(status); MBEDTLS_SSL_DEBUG_RET(1, "psa_import_mac_key", ret); goto end; } if ((transform->psa_alg == MBEDTLS_SSL_NULL_CIPHER) || ((transform->psa_alg == PSA_ALG_CBC_NO_PADDING) #if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM) && (transform->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED) #endif )) { /* mbedtls_ct_hmac() requires the key to be exportable */ psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_EXPORT | PSA_KEY_USAGE_VERIFY_HASH); } else { psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_VERIFY_HASH); } if ((status = psa_import_key(&attributes, mac_dec, mac_key_len, &transform->psa_mac_dec)) != PSA_SUCCESS) { ret = PSA_TO_MBEDTLS_ERR(status); MBEDTLS_SSL_DEBUG_RET(1, "psa_import_mac_key", ret); goto end; } #else ret = mbedtls_md_hmac_starts(&transform->md_ctx_enc, mac_enc, mac_key_len); if (ret != 0) { goto end; } ret = mbedtls_md_hmac_starts(&transform->md_ctx_dec, mac_dec, mac_key_len); if (ret != 0) { goto end; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ } #endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */ ((void) mac_dec); ((void) mac_enc); end: mbedtls_platform_zeroize(keyblk, sizeof(keyblk)); return ret; } #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) && \ defined(MBEDTLS_USE_PSA_CRYPTO) int mbedtls_psa_ecjpake_read_round( psa_pake_operation_t *pake_ctx, const unsigned char *buf, size_t len, mbedtls_ecjpake_rounds_t round) { psa_status_t status; size_t input_offset = 0; /* * At round one repeat the KEY_SHARE, ZK_PUBLIC & ZF_PROOF twice * At round two perform a single cycle */ unsigned int remaining_steps = (round == MBEDTLS_ECJPAKE_ROUND_ONE) ? 2 : 1; for (; remaining_steps > 0; remaining_steps--) { for (psa_pake_step_t step = PSA_PAKE_STEP_KEY_SHARE; step <= PSA_PAKE_STEP_ZK_PROOF; ++step) { /* Length is stored at the first byte */ size_t length = buf[input_offset]; input_offset += 1; if (input_offset + length > len) { return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; } status = psa_pake_input(pake_ctx, step, buf + input_offset, length); if (status != PSA_SUCCESS) { return PSA_TO_MBEDTLS_ERR(status); } input_offset += length; } } if (input_offset != len) { return MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE; } return 0; } int mbedtls_psa_ecjpake_write_round( psa_pake_operation_t *pake_ctx, unsigned char *buf, size_t len, size_t *olen, mbedtls_ecjpake_rounds_t round) { psa_status_t status; size_t output_offset = 0; size_t output_len; /* * At round one repeat the KEY_SHARE, ZK_PUBLIC & ZF_PROOF twice * At round two perform a single cycle */ unsigned int remaining_steps = (round == MBEDTLS_ECJPAKE_ROUND_ONE) ? 2 : 1; for (; remaining_steps > 0; remaining_steps--) { for (psa_pake_step_t step = PSA_PAKE_STEP_KEY_SHARE; step <= PSA_PAKE_STEP_ZK_PROOF; ++step) { /* * For each step, prepend 1 byte with the length of the data as * given by psa_pake_output(). */ status = psa_pake_output(pake_ctx, step, buf + output_offset + 1, len - output_offset - 1, &output_len); if (status != PSA_SUCCESS) { return PSA_TO_MBEDTLS_ERR(status); } *(buf + output_offset) = (uint8_t) output_len; output_offset += output_len + 1; } } *olen = output_offset; return 0; } #endif //MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED && MBEDTLS_USE_PSA_CRYPTO #if defined(MBEDTLS_USE_PSA_CRYPTO) int mbedtls_ssl_get_key_exchange_md_tls1_2(mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hashlen, unsigned char *data, size_t data_len, mbedtls_md_type_t md_alg) { psa_status_t status; psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT; psa_algorithm_t hash_alg = mbedtls_hash_info_psa_from_md(md_alg); MBEDTLS_SSL_DEBUG_MSG(3, ("Perform PSA-based computation of digest of ServerKeyExchange")); if ((status = psa_hash_setup(&hash_operation, hash_alg)) != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_setup", status); goto exit; } if ((status = psa_hash_update(&hash_operation, ssl->handshake->randbytes, 64)) != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_update", status); goto exit; } if ((status = psa_hash_update(&hash_operation, data, data_len)) != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_update", status); goto exit; } if ((status = psa_hash_finish(&hash_operation, hash, PSA_HASH_MAX_SIZE, hashlen)) != PSA_SUCCESS) { MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_finish", status); goto exit; } exit: if (status != PSA_SUCCESS) { mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR); switch (status) { case PSA_ERROR_NOT_SUPPORTED: return MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE; case PSA_ERROR_BAD_STATE: /* Intentional fallthrough */ case PSA_ERROR_BUFFER_TOO_SMALL: return MBEDTLS_ERR_MD_BAD_INPUT_DATA; case PSA_ERROR_INSUFFICIENT_MEMORY: return MBEDTLS_ERR_MD_ALLOC_FAILED; default: return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; } } return 0; } #else int mbedtls_ssl_get_key_exchange_md_tls1_2(mbedtls_ssl_context *ssl, unsigned char *hash, size_t *hashlen, unsigned char *data, size_t data_len, mbedtls_md_type_t md_alg) { int ret = 0; mbedtls_md_context_t ctx; const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_alg); *hashlen = mbedtls_md_get_size(md_info); MBEDTLS_SSL_DEBUG_MSG(3, ("Perform mbedtls-based computation of digest of ServerKeyExchange")); mbedtls_md_init(&ctx); /* * digitally-signed struct { * opaque client_random[32]; * opaque server_random[32]; * ServerDHParams params; * }; */ if ((ret = mbedtls_md_setup(&ctx, md_info, 0)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_setup", ret); goto exit; } if ((ret = mbedtls_md_starts(&ctx)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_starts", ret); goto exit; } if ((ret = mbedtls_md_update(&ctx, ssl->handshake->randbytes, 64)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_update", ret); goto exit; } if ((ret = mbedtls_md_update(&ctx, data, data_len)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_update", ret); goto exit; } if ((ret = mbedtls_md_finish(&ctx, hash)) != 0) { MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_finish", ret); goto exit; } exit: mbedtls_md_free(&ctx); if (ret != 0) { mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR); } return ret; } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) /* Find the preferred hash for a given signature algorithm. */ unsigned int mbedtls_ssl_tls12_get_preferred_hash_for_sig_alg( mbedtls_ssl_context *ssl, unsigned int sig_alg) { unsigned int i; uint16_t *received_sig_algs = ssl->handshake->received_sig_algs; if (sig_alg == MBEDTLS_SSL_SIG_ANON) { return MBEDTLS_SSL_HASH_NONE; } for (i = 0; received_sig_algs[i] != MBEDTLS_TLS_SIG_NONE; i++) { unsigned int hash_alg_received = MBEDTLS_SSL_TLS12_HASH_ALG_FROM_SIG_AND_HASH_ALG( received_sig_algs[i]); unsigned int sig_alg_received = MBEDTLS_SSL_TLS12_SIG_ALG_FROM_SIG_AND_HASH_ALG( received_sig_algs[i]); if (sig_alg == sig_alg_received) { #if defined(MBEDTLS_USE_PSA_CRYPTO) if (ssl->handshake->key_cert && ssl->handshake->key_cert->key) { psa_algorithm_t psa_hash_alg = mbedtls_hash_info_psa_from_md(hash_alg_received); if (sig_alg_received == MBEDTLS_SSL_SIG_ECDSA && !mbedtls_pk_can_do_ext(ssl->handshake->key_cert->key, PSA_ALG_ECDSA(psa_hash_alg), PSA_KEY_USAGE_SIGN_HASH)) { continue; } if (sig_alg_received == MBEDTLS_SSL_SIG_RSA && !mbedtls_pk_can_do_ext(ssl->handshake->key_cert->key, PSA_ALG_RSA_PKCS1V15_SIGN( psa_hash_alg), PSA_KEY_USAGE_SIGN_HASH)) { continue; } } #endif /* MBEDTLS_USE_PSA_CRYPTO */ return hash_alg_received; } } return MBEDTLS_SSL_HASH_NONE; } #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ /* Serialization of TLS 1.2 sessions: * * struct { * uint64 start_time; * uint8 ciphersuite[2]; // defined by the standard * uint8 session_id_len; // at most 32 * opaque session_id[32]; * opaque master[48]; // fixed length in the standard * uint32 verify_result; * opaque peer_cert<0..2^24-1>; // length 0 means no peer cert * opaque ticket<0..2^24-1>; // length 0 means no ticket * uint32 ticket_lifetime; * uint8 mfl_code; // up to 255 according to standard * uint8 encrypt_then_mac; // 0 or 1 * } serialized_session_tls12; * */ static size_t ssl_tls12_session_save(const mbedtls_ssl_session *session, unsigned char *buf, size_t buf_len) { unsigned char *p = buf; size_t used = 0; #if defined(MBEDTLS_HAVE_TIME) uint64_t start; #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) size_t cert_len; #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ /* * Time */ #if defined(MBEDTLS_HAVE_TIME) used += 8; if (used <= buf_len) { start = (uint64_t) session->start; MBEDTLS_PUT_UINT64_BE(start, p, 0); p += 8; } #endif /* MBEDTLS_HAVE_TIME */ /* * Basic mandatory fields */ used += 2 /* ciphersuite */ + 1 /* id_len */ + sizeof(session->id) + sizeof(session->master) + 4; /* verify_result */ if (used <= buf_len) { MBEDTLS_PUT_UINT16_BE(session->ciphersuite, p, 0); p += 2; *p++ = MBEDTLS_BYTE_0(session->id_len); memcpy(p, session->id, 32); p += 32; memcpy(p, session->master, 48); p += 48; MBEDTLS_PUT_UINT32_BE(session->verify_result, p, 0); p += 4; } /* * Peer's end-entity certificate */ #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) if (session->peer_cert == NULL) { cert_len = 0; } else { cert_len = session->peer_cert->raw.len; } used += 3 + cert_len; if (used <= buf_len) { *p++ = MBEDTLS_BYTE_2(cert_len); *p++ = MBEDTLS_BYTE_1(cert_len); *p++ = MBEDTLS_BYTE_0(cert_len); if (session->peer_cert != NULL) { memcpy(p, session->peer_cert->raw.p, cert_len); p += cert_len; } } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ if (session->peer_cert_digest != NULL) { used += 1 /* type */ + 1 /* length */ + session->peer_cert_digest_len; if (used <= buf_len) { *p++ = (unsigned char) session->peer_cert_digest_type; *p++ = (unsigned char) session->peer_cert_digest_len; memcpy(p, session->peer_cert_digest, session->peer_cert_digest_len); p += session->peer_cert_digest_len; } } else { used += 2; if (used <= buf_len) { *p++ = (unsigned char) MBEDTLS_MD_NONE; *p++ = 0; } } #endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ /* * Session ticket if any, plus associated data */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) used += 3 + session->ticket_len + 4; /* len + ticket + lifetime */ if (used <= buf_len) { *p++ = MBEDTLS_BYTE_2(session->ticket_len); *p++ = MBEDTLS_BYTE_1(session->ticket_len); *p++ = MBEDTLS_BYTE_0(session->ticket_len); if (session->ticket != NULL) { memcpy(p, session->ticket, session->ticket_len); p += session->ticket_len; } MBEDTLS_PUT_UINT32_BE(session->ticket_lifetime, p, 0); p += 4; } #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ /* * Misc extension-related info */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) used += 1; if (used <= buf_len) { *p++ = session->mfl_code; } #endif #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) used += 1; if (used <= buf_len) { *p++ = MBEDTLS_BYTE_0(session->encrypt_then_mac); } #endif return used; } MBEDTLS_CHECK_RETURN_CRITICAL static int ssl_tls12_session_load(mbedtls_ssl_session *session, const unsigned char *buf, size_t len) { #if defined(MBEDTLS_HAVE_TIME) uint64_t start; #endif #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) size_t cert_len; #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ const unsigned char *p = buf; const unsigned char * const end = buf + len; /* * Time */ #if defined(MBEDTLS_HAVE_TIME) if (8 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } start = ((uint64_t) p[0] << 56) | ((uint64_t) p[1] << 48) | ((uint64_t) p[2] << 40) | ((uint64_t) p[3] << 32) | ((uint64_t) p[4] << 24) | ((uint64_t) p[5] << 16) | ((uint64_t) p[6] << 8) | ((uint64_t) p[7]); p += 8; session->start = (time_t) start; #endif /* MBEDTLS_HAVE_TIME */ /* * Basic mandatory fields */ if (2 + 1 + 32 + 48 + 4 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ciphersuite = (p[0] << 8) | p[1]; p += 2; session->id_len = *p++; memcpy(session->id, p, 32); p += 32; memcpy(session->master, p, 48); p += 48; session->verify_result = ((uint32_t) p[0] << 24) | ((uint32_t) p[1] << 16) | ((uint32_t) p[2] << 8) | ((uint32_t) p[3]); p += 4; /* Immediately clear invalid pointer values that have been read, in case * we exit early before we replaced them with valid ones. */ #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) session->peer_cert = NULL; #else session->peer_cert_digest = NULL; #endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) session->ticket = NULL; #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ /* * Peer certificate */ #if defined(MBEDTLS_X509_CRT_PARSE_C) #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) /* Deserialize CRT from the end of the ticket. */ if (3 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } cert_len = (p[0] << 16) | (p[1] << 8) | p[2]; p += 3; if (cert_len != 0) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; if (cert_len > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->peer_cert = mbedtls_calloc(1, sizeof(mbedtls_x509_crt)); if (session->peer_cert == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } mbedtls_x509_crt_init(session->peer_cert); if ((ret = mbedtls_x509_crt_parse_der(session->peer_cert, p, cert_len)) != 0) { mbedtls_x509_crt_free(session->peer_cert); mbedtls_free(session->peer_cert); session->peer_cert = NULL; return ret; } p += cert_len; } #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ /* Deserialize CRT digest from the end of the ticket. */ if (2 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->peer_cert_digest_type = (mbedtls_md_type_t) *p++; session->peer_cert_digest_len = (size_t) *p++; if (session->peer_cert_digest_len != 0) { const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(session->peer_cert_digest_type); if (md_info == NULL) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (session->peer_cert_digest_len != mbedtls_md_get_size(md_info)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } if (session->peer_cert_digest_len > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->peer_cert_digest = mbedtls_calloc(1, session->peer_cert_digest_len); if (session->peer_cert_digest == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(session->peer_cert_digest, p, session->peer_cert_digest_len); p += session->peer_cert_digest_len; } #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ #endif /* MBEDTLS_X509_CRT_PARSE_C */ /* * Session ticket and associated data */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) if (3 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ticket_len = (p[0] << 16) | (p[1] << 8) | p[2]; p += 3; if (session->ticket_len != 0) { if (session->ticket_len > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ticket = mbedtls_calloc(1, session->ticket_len); if (session->ticket == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(session->ticket, p, session->ticket_len); p += session->ticket_len; } if (4 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->ticket_lifetime = ((uint32_t) p[0] << 24) | ((uint32_t) p[1] << 16) | ((uint32_t) p[2] << 8) | ((uint32_t) p[3]); p += 4; #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ /* * Misc extension-related info */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) if (1 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->mfl_code = *p++; #endif #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) if (1 > (size_t) (end - p)) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } session->encrypt_then_mac = *p++; #endif /* Done, should have consumed entire buffer */ if (p != end) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } return 0; } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ int mbedtls_ssl_validate_ciphersuite( const mbedtls_ssl_context *ssl, const mbedtls_ssl_ciphersuite_t *suite_info, mbedtls_ssl_protocol_version min_tls_version, mbedtls_ssl_protocol_version max_tls_version) { (void) ssl; if (suite_info == NULL) { return -1; } if ((suite_info->min_tls_version > max_tls_version) || (suite_info->max_tls_version < min_tls_version)) { return -1; } #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && defined(MBEDTLS_SSL_CLI_C) #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) #if defined(MBEDTLS_USE_PSA_CRYPTO) if (suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && ssl->handshake->psa_pake_ctx_is_ok != 1) #else if (suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && mbedtls_ecjpake_check(&ssl->handshake->ecjpake_ctx) != 0) #endif /* MBEDTLS_USE_PSA_CRYPTO */ { return -1; } #endif /* Don't suggest PSK-based ciphersuite if no PSK is available. */ #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) if (mbedtls_ssl_ciphersuite_uses_psk(suite_info) && mbedtls_ssl_conf_has_static_psk(ssl->conf) == 0) { return -1; } #endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ return 0; } #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED) /* * Function for writing a signature algorithm extension. * * The `extension_data` field of signature algorithm contains a `SignatureSchemeList` * value (TLS 1.3 RFC8446): * enum { * .... * ecdsa_secp256r1_sha256( 0x0403 ), * ecdsa_secp384r1_sha384( 0x0503 ), * ecdsa_secp521r1_sha512( 0x0603 ), * .... * } SignatureScheme; * * struct { * SignatureScheme supported_signature_algorithms<2..2^16-2>; * } SignatureSchemeList; * * The `extension_data` field of signature algorithm contains a `SignatureAndHashAlgorithm` * value (TLS 1.2 RFC5246): * enum { * none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5), * sha512(6), (255) * } HashAlgorithm; * * enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) } * SignatureAlgorithm; * * struct { * HashAlgorithm hash; * SignatureAlgorithm signature; * } SignatureAndHashAlgorithm; * * SignatureAndHashAlgorithm * supported_signature_algorithms<2..2^16-2>; * * The TLS 1.3 signature algorithm extension was defined to be a compatible * generalization of the TLS 1.2 signature algorithm extension. * `SignatureAndHashAlgorithm` field of TLS 1.2 can be represented by * `SignatureScheme` field of TLS 1.3 * */ int mbedtls_ssl_write_sig_alg_ext(mbedtls_ssl_context *ssl, unsigned char *buf, const unsigned char *end, size_t *out_len) { unsigned char *p = buf; unsigned char *supported_sig_alg; /* Start of supported_signature_algorithms */ size_t supported_sig_alg_len = 0; /* Length of supported_signature_algorithms */ *out_len = 0; MBEDTLS_SSL_DEBUG_MSG(3, ("adding signature_algorithms extension")); /* Check if we have space for header and length field: * - extension_type (2 bytes) * - extension_data_length (2 bytes) * - supported_signature_algorithms_length (2 bytes) */ MBEDTLS_SSL_CHK_BUF_PTR(p, end, 6); p += 6; /* * Write supported_signature_algorithms */ supported_sig_alg = p; const uint16_t *sig_alg = mbedtls_ssl_get_sig_algs(ssl); if (sig_alg == NULL) { return MBEDTLS_ERR_SSL_BAD_CONFIG; } for (; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++) { MBEDTLS_SSL_DEBUG_MSG(3, ("got signature scheme [%x] %s", *sig_alg, mbedtls_ssl_sig_alg_to_str(*sig_alg))); if (!mbedtls_ssl_sig_alg_is_supported(ssl, *sig_alg)) { continue; } MBEDTLS_SSL_CHK_BUF_PTR(p, end, 2); MBEDTLS_PUT_UINT16_BE(*sig_alg, p, 0); p += 2; MBEDTLS_SSL_DEBUG_MSG(3, ("sent signature scheme [%x] %s", *sig_alg, mbedtls_ssl_sig_alg_to_str(*sig_alg))); } /* Length of supported_signature_algorithms */ supported_sig_alg_len = p - supported_sig_alg; if (supported_sig_alg_len == 0) { MBEDTLS_SSL_DEBUG_MSG(1, ("No signature algorithms defined.")); return MBEDTLS_ERR_SSL_INTERNAL_ERROR; } MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_SIG_ALG, buf, 0); MBEDTLS_PUT_UINT16_BE(supported_sig_alg_len + 2, buf, 2); MBEDTLS_PUT_UINT16_BE(supported_sig_alg_len, buf, 4); *out_len = p - buf; #if defined(MBEDTLS_SSL_PROTO_TLS1_3) mbedtls_ssl_tls13_set_hs_sent_ext_mask(ssl, MBEDTLS_TLS_EXT_SIG_ALG); #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */ return 0; } #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) /* * mbedtls_ssl_parse_server_name_ext * * Structure of server_name extension: * * enum { * host_name(0), (255) * } NameType; * opaque HostName<1..2^16-1>; * * struct { * NameType name_type; * select (name_type) { * case host_name: HostName; * } name; * } ServerName; * struct { * ServerName server_name_list<1..2^16-1> * } ServerNameList; */ MBEDTLS_CHECK_RETURN_CRITICAL int mbedtls_ssl_parse_server_name_ext(mbedtls_ssl_context *ssl, const unsigned char *buf, const unsigned char *end) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; const unsigned char *p = buf; size_t server_name_list_len, hostname_len; const unsigned char *server_name_list_end; MBEDTLS_SSL_DEBUG_MSG(3, ("parse ServerName extension")); MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, 2); server_name_list_len = MBEDTLS_GET_UINT16_BE(p, 0); p += 2; MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, server_name_list_len); server_name_list_end = p + server_name_list_len; while (p < server_name_list_end) { MBEDTLS_SSL_CHK_BUF_READ_PTR(p, server_name_list_end, 3); hostname_len = MBEDTLS_GET_UINT16_BE(p, 1); MBEDTLS_SSL_CHK_BUF_READ_PTR(p, server_name_list_end, hostname_len + 3); if (p[0] == MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME) { /* sni_name is intended to be used only during the parsing of the * ClientHello message (it is reset to NULL before the end of * the message parsing). Thus it is ok to just point to the * reception buffer and not make a copy of it. */ ssl->handshake->sni_name = p + 3; ssl->handshake->sni_name_len = hostname_len; if (ssl->conf->f_sni == NULL) { return 0; } ret = ssl->conf->f_sni(ssl->conf->p_sni, ssl, p + 3, hostname_len); if (ret != 0) { MBEDTLS_SSL_DEBUG_RET(1, "ssl_sni_wrapper", ret); MBEDTLS_SSL_PEND_FATAL_ALERT(MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME, MBEDTLS_ERR_SSL_UNRECOGNIZED_NAME); return MBEDTLS_ERR_SSL_UNRECOGNIZED_NAME; } return 0; } p += hostname_len + 3; } return 0; } #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ #if defined(MBEDTLS_SSL_ALPN) MBEDTLS_CHECK_RETURN_CRITICAL int mbedtls_ssl_parse_alpn_ext(mbedtls_ssl_context *ssl, const unsigned char *buf, const unsigned char *end) { const unsigned char *p = buf; size_t protocol_name_list_len; const unsigned char *protocol_name_list; const unsigned char *protocol_name_list_end; size_t protocol_name_len; /* If ALPN not configured, just ignore the extension */ if (ssl->conf->alpn_list == NULL) { return 0; } /* * RFC7301, section 3.1 * opaque ProtocolName<1..2^8-1>; * * struct { * ProtocolName protocol_name_list<2..2^16-1> * } ProtocolNameList; */ /* * protocol_name_list_len 2 bytes * protocol_name_len 1 bytes * protocol_name >=1 byte */ MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, 4); protocol_name_list_len = MBEDTLS_GET_UINT16_BE(p, 0); p += 2; MBEDTLS_SSL_CHK_BUF_READ_PTR(p, end, protocol_name_list_len); protocol_name_list = p; protocol_name_list_end = p + protocol_name_list_len; /* Validate peer's list (lengths) */ while (p < protocol_name_list_end) { protocol_name_len = *p++; MBEDTLS_SSL_CHK_BUF_READ_PTR(p, protocol_name_list_end, protocol_name_len); if (protocol_name_len == 0) { MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER, MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER); return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER; } p += protocol_name_len; } /* Use our order of preference */ for (const char **alpn = ssl->conf->alpn_list; *alpn != NULL; alpn++) { size_t const alpn_len = strlen(*alpn); p = protocol_name_list; while (p < protocol_name_list_end) { protocol_name_len = *p++; if (protocol_name_len == alpn_len && memcmp(p, *alpn, alpn_len) == 0) { ssl->alpn_chosen = *alpn; return 0; } p += protocol_name_len; } } /* If we get here, no match was found */ MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL, MBEDTLS_ERR_SSL_NO_APPLICATION_PROTOCOL); return MBEDTLS_ERR_SSL_NO_APPLICATION_PROTOCOL; } int mbedtls_ssl_write_alpn_ext(mbedtls_ssl_context *ssl, unsigned char *buf, unsigned char *end, size_t *out_len) { unsigned char *p = buf; size_t protocol_name_len; *out_len = 0; if (ssl->alpn_chosen == NULL) { return 0; } protocol_name_len = strlen(ssl->alpn_chosen); MBEDTLS_SSL_CHK_BUF_PTR(p, end, 7 + protocol_name_len); MBEDTLS_SSL_DEBUG_MSG(3, ("server side, adding alpn extension")); /* * 0 . 1 ext identifier * 2 . 3 ext length * 4 . 5 protocol list length * 6 . 6 protocol name length * 7 . 7+n protocol name */ MBEDTLS_PUT_UINT16_BE(MBEDTLS_TLS_EXT_ALPN, p, 0); *out_len = 7 + protocol_name_len; MBEDTLS_PUT_UINT16_BE(protocol_name_len + 3, p, 2); MBEDTLS_PUT_UINT16_BE(protocol_name_len + 1, p, 4); /* Note: the length of the chosen protocol has been checked to be less * than 255 bytes in `mbedtls_ssl_conf_alpn_protocols`. */ p[6] = MBEDTLS_BYTE_0(protocol_name_len); memcpy(p + 7, ssl->alpn_chosen, protocol_name_len); #if defined(MBEDTLS_SSL_PROTO_TLS1_3) mbedtls_ssl_tls13_set_hs_sent_ext_mask(ssl, MBEDTLS_TLS_EXT_ALPN); #endif return 0; } #endif /* MBEDTLS_SSL_ALPN */ #if defined(MBEDTLS_SSL_PROTO_TLS1_3) && \ defined(MBEDTLS_SSL_SESSION_TICKETS) && \ defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) && \ defined(MBEDTLS_SSL_CLI_C) int mbedtls_ssl_session_set_hostname(mbedtls_ssl_session *session, const char *hostname) { /* Initialize to suppress unnecessary compiler warning */ size_t hostname_len = 0; /* Check if new hostname is valid before * making any change to current one */ if (hostname != NULL) { hostname_len = strlen(hostname); if (hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN) { return MBEDTLS_ERR_SSL_BAD_INPUT_DATA; } } /* Now it's clear that we will overwrite the old hostname, * so we can free it safely */ if (session->hostname != NULL) { mbedtls_platform_zeroize(session->hostname, strlen(session->hostname)); mbedtls_free(session->hostname); } /* Passing NULL as hostname shall clear the old one */ if (hostname == NULL) { session->hostname = NULL; } else { session->hostname = mbedtls_calloc(1, hostname_len + 1); if (session->hostname == NULL) { return MBEDTLS_ERR_SSL_ALLOC_FAILED; } memcpy(session->hostname, hostname, hostname_len); } return 0; } #endif /* MBEDTLS_SSL_PROTO_TLS1_3 && MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_SERVER_NAME_INDICATION && MBEDTLS_SSL_CLI_C */ #endif /* MBEDTLS_SSL_TLS_C */