/* * 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) #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else #include #define mbedtls_calloc calloc #define mbedtls_free free #endif #include "mbedtls/ssl.h" #include "ssl_misc.h" #include "mbedtls/debug.h" #include "mbedtls/error.h" #include "mbedtls/platform_util.h" #include "mbedtls/version.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_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_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 || ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) { 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_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 ); } #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ return( 0 ); } #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH) 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_USE_PSA_CRYPTO) static psa_status_t setup_psa_key_derivation( psa_key_derivation_operation_t* derivation, psa_key_id_t key, psa_algorithm_t alg, const unsigned char* seed, size_t seed_length, const unsigned char* label, size_t label_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( mbedtls_svc_key_id_is_null( key ) ) { status = psa_key_derivation_input_bytes( derivation, PSA_KEY_DERIVATION_INPUT_SECRET, NULL, 0 ); } 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 ); } 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; psa_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, random, rlen, (unsigned char const *) label, (size_t) strlen( label ), 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 ); } #else /* MBEDTLS_USE_PSA_CRYPTO */ 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; mbedtls_md_hmac_starts( &md_ctx, secret, slen ); mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb ); mbedtls_md_hmac_finish( &md_ctx, tmp ); for( i = 0; i < dlen; i += md_len ) { mbedtls_md_hmac_reset ( &md_ctx ); mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb ); mbedtls_md_hmac_finish( &md_ctx, h_i ); mbedtls_md_hmac_reset ( &md_ctx ); mbedtls_md_hmac_update( &md_ctx, tmp, md_len ); mbedtls_md_hmac_finish( &md_ctx, tmp ); 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 ); mbedtls_platform_zeroize( tmp, tmp_len ); mbedtls_platform_zeroize( h_i, sizeof( h_i ) ); mbedtls_free( tmp ); return( ret ); } #endif /* MBEDTLS_USE_PSA_CRYPTO */ #if defined(MBEDTLS_SHA256_C) 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_SHA256_C */ #if defined(MBEDTLS_SHA384_C) 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_SHA384_C */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t ); #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t ); static void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *,unsigned char*, size_t * ); static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int ); #endif #if defined(MBEDTLS_SHA384_C) static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t ); static void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *, unsigned char*, size_t * ); static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int ); #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) && \ defined(MBEDTLS_USE_PSA_CRYPTO) static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl ) { if( ssl->conf->f_psk != NULL ) { /* If we've used a callback to select the PSK, * the static configuration is irrelevant. */ if( ! mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) ) return( 1 ); return( 0 ); } if( ! mbedtls_svc_key_id_is_null( ssl->conf->psk_opaque ) ) return( 1 ); return( 0 ); } #endif /* MBEDTLS_USE_PSA_CRYPTO && MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ #if defined(MBEDTLS_SSL_EXPORT_KEYS) static mbedtls_tls_prf_types tls_prf_get_type( mbedtls_ssl_tls_prf_cb *tls_prf ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA384_C) if( tls_prf == tls_prf_sha384 ) { return( MBEDTLS_SSL_TLS_PRF_SHA384 ); } else #endif #if defined(MBEDTLS_SHA256_C) if( tls_prf == tls_prf_sha256 ) { return( MBEDTLS_SSL_TLS_PRF_SHA256 ); } else #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ return( MBEDTLS_SSL_TLS_PRF_NONE ); } #endif /* MBEDTLS_SSL_EXPORT_KEYS */ 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_SHA384_C) case MBEDTLS_SSL_TLS_PRF_SHA384: tls_prf = tls_prf_sha384; break; #endif /* MBEDTLS_SHA384_C */ #if defined(MBEDTLS_SHA256_C) case MBEDTLS_SSL_TLS_PRF_SHA256: tls_prf = tls_prf_sha256; break; #endif /* MBEDTLS_SHA256_C */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ default: return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); } return( tls_prf( secret, slen, label, random, rlen, dstbuf, dlen ) ); } /* 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); /* * 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] compression * - [in] tls_prf: pointer to PRF to use for key derivation * - [in] randbytes: buffer holding ServerHello.random + ClientHello.random * - [in] minor_ver: SSL/TLS minor version * - [in] endpoint: client or server * - [in] ssl: optionally used for: * - MBEDTLS_SSL_EXPORT_KEYS: ssl->conf->{f,p}_export_keys * - MBEDTLS_DEBUG_C: ssl->conf->{f,p}_dbg */ static int ssl_tls12_populate_transform( mbedtls_ssl_transform *transform, int ciphersuite, const unsigned char master[48], #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC) && \ defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) int encrypt_then_mac, #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC && MBEDTLS_SSL_SOME_SUITES_USE_MAC */ ssl_tls_prf_t tls_prf, const unsigned char randbytes[64], int minor_ver, unsigned endpoint, const mbedtls_ssl_context *ssl ) { int ret = 0; #if defined(MBEDTLS_USE_PSA_CRYPTO) int psa_fallthrough; #endif /* MBEDTLS_USE_PSA_CRYPTO */ 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; unsigned keylen; const mbedtls_ssl_ciphersuite_t *ciphersuite_info; const mbedtls_cipher_info_t *cipher_info; const mbedtls_md_info_t *md_info; #if !defined(MBEDTLS_SSL_EXPORT_KEYS) && \ !defined(MBEDTLS_DEBUG_C) ssl = NULL; /* make sure we don't use it except for those cases */ (void) ssl; #endif /* * Some data just needs copying into the structure */ #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) && \ defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC) transform->encrypt_then_mac = encrypt_then_mac; #endif transform->minor_ver = minor_ver; #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) memcpy( transform->randbytes, randbytes, sizeof( transform->randbytes ) ); #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL) if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_4 ) { /* 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_EXPERIMENTAL */ /* * 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 ); } 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 ); } 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 ); } #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. */ keylen = cipher_info->key_bitlen / 8; #if defined(MBEDTLS_GCM_C) || \ defined(MBEDTLS_CCM_C) || \ defined(MBEDTLS_CHACHAPOLY_C) if( cipher_info->mode == MBEDTLS_MODE_GCM || cipher_info->mode == MBEDTLS_MODE_CCM || cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY ) { size_t explicit_ivlen; transform->maclen = 0; mac_key_len = 0; transform->taglen = ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; /* 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; if( cipher_info->mode == MBEDTLS_MODE_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( cipher_info->mode == MBEDTLS_MODE_STREAM || cipher_info->mode == MBEDTLS_MODE_CBC ) { /* 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 ); transform->maclen = mac_key_len; /* IV length */ transform->ivlen = cipher_info->iv_size; /* Minimum length */ if( cipher_info->mode == MBEDTLS_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( encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED ) { transform->minlen = transform->maclen + cipher_info->block_size; } else #endif { transform->minlen = transform->maclen + cipher_info->block_size - transform->maclen % cipher_info->block_size; } #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) { transform->minlen += transform->ivlen; } else #endif { 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; /* * This is not used in TLS v1.1. */ 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; /* * This is not used in TLS v1.1. */ 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 defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC) #if defined(MBEDTLS_SSL_PROTO_TLS1_2) /* For HMAC-based ciphersuites, initialize the HMAC transforms. For AEAD-based ciphersuites, there is nothing to do here. */ if( mac_key_len != 0 ) { mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len ); mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len ); } #endif #endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */ ((void) mac_dec); ((void) mac_enc); #if defined(MBEDTLS_SSL_EXPORT_KEYS) if( 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 ) ); } #endif #if defined(MBEDTLS_USE_PSA_CRYPTO) /* Only use PSA-based ciphers for TLS-1.2. * That's relevant at least for TLS-1.0, where * we assume that mbedtls_cipher_crypt() updates * the structure field for the IV, which the PSA-based * implementation currently doesn't. */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) { ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_enc, cipher_info, transform->taglen ); if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) { MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret ); goto end; } if( ret == 0 ) { MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based encryption cipher context" ) ); psa_fallthrough = 0; } else { MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record encryption - fall through to default setup." ) ); psa_fallthrough = 1; } } else psa_fallthrough = 1; #else psa_fallthrough = 1; #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ if( psa_fallthrough == 1 ) #endif /* MBEDTLS_USE_PSA_CRYPTO */ if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc, cipher_info ) ) != 0 ) { MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret ); goto end; } #if defined(MBEDTLS_USE_PSA_CRYPTO) /* Only use PSA-based ciphers for TLS-1.2. * That's relevant at least for TLS-1.0, where * we assume that mbedtls_cipher_crypt() updates * the structure field for the IV, which the PSA-based * implementation currently doesn't. */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) { ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_dec, cipher_info, transform->taglen ); if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) { MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret ); goto end; } if( ret == 0 ) { MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based decryption cipher context" ) ); psa_fallthrough = 0; } else { MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record decryption - fall through to default setup." ) ); psa_fallthrough = 1; } } else psa_fallthrough = 1; #else psa_fallthrough = 1; #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ if( psa_fallthrough == 1 ) #endif /* MBEDTLS_USE_PSA_CRYPTO */ 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, cipher_info->key_bitlen, MBEDTLS_ENCRYPT ) ) != 0 ) { MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); goto end; } if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2, cipher_info->key_bitlen, MBEDTLS_DECRYPT ) ) != 0 ) { MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); goto end; } #if defined(MBEDTLS_CIPHER_MODE_CBC) if( cipher_info->mode == 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 */ end: mbedtls_platform_zeroize( keyblk, sizeof( keyblk ) ); return( ret ); } /* * Set appropriate PRF function and other SSL / TLS1.2 functions * * Inputs: * - SSL/TLS minor version * - hash associated with the ciphersuite (only used by TLS 1.2) * * Outputs: * - the tls_prf, calc_verify and calc_finished members of handshake structure */ static int ssl_set_handshake_prfs( mbedtls_ssl_handshake_params *handshake, int minor_ver, mbedtls_md_type_t hash ) { #if !defined(MBEDTLS_SSL_PROTO_TLS1_2) || !defined(MBEDTLS_SHA384_C) (void) hash; #endif #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA384_C) if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && 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_SHA256_C) if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) { handshake->tls_prf = tls_prf_sha256; handshake->calc_verify = ssl_calc_verify_tls_sha256; handshake->calc_finished = ssl_calc_finished_tls_sha256; } else #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ { return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); } 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: minor_ver, conf */ 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 salt 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 *salt = handshake->randbytes; size_t salt_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"; salt = session_hash; handshake->calc_verify( ssl, session_hash, &salt_len ); MBEDTLS_SSL_DEBUG_BUF( 3, "session hash for extended master secret", session_hash, salt_len ); } #endif /* MBEDTLS_SSL_EXTENDED_MS_ENABLED */ #if defined(MBEDTLS_USE_PSA_CRYPTO) && \ defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) if( handshake->ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK && ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && ssl_use_opaque_psk( ssl ) == 1 ) { /* Perform PSK-to-MS expansion in a single step. */ psa_status_t status; psa_algorithm_t alg; psa_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); status = setup_psa_key_derivation( &derivation, psk, alg, salt, salt_len, (unsigned char const *) lbl, (size_t) strlen( lbl ), 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 { ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, lbl, salt, salt_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, ssl->minor_ver, 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_MAC) && \ defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) ssl->session_negotiate->encrypt_then_mac, #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC && MBEDTLS_SSL_SOME_SUITES_USE_MAC */ ssl->handshake->tls_prf, ssl->handshake->randbytes, ssl->minor_ver, 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 ); } #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) void 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 ) { MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); return; } status = psa_hash_finish( &sha256_psa, hash, 32, &hash_size ); if( status != PSA_SUCCESS ) { MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); return; } *hlen = 32; MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, *hlen ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) ); #else mbedtls_sha256_context sha256; mbedtls_sha256_init( &sha256 ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) ); mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); mbedtls_sha256_finish( &sha256, hash ); *hlen = 32; MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); mbedtls_sha256_free( &sha256 ); #endif /* MBEDTLS_USE_PSA_CRYPTO */ return; } #endif /* MBEDTLS_SHA256_C */ #if defined(MBEDTLS_SHA384_C) void 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 ) { MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); return; } status = psa_hash_finish( &sha384_psa, hash, 48, &hash_size ); if( status != PSA_SUCCESS ) { MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); return; } *hlen = 48; MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, *hlen ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) ); #else mbedtls_sha512_context sha512; mbedtls_sha512_init( &sha512 ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) ); mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); mbedtls_sha512_finish( &sha512, hash ); *hlen = 48; MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); mbedtls_sha512_free( &sha512 ); #endif /* MBEDTLS_USE_PSA_CRYPTO */ return; } #endif /* MBEDTLS_SHA384_C */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if 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; if( mbedtls_ssl_get_psk( ssl, &psk, &psk_len ) == MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ) { /* * This should never happen because the existence of a PSK is always * checked before calling this function */ 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 ); *(p++) = (unsigned char)( psk_len >> 8 ); *(p++) = (unsigned char)( psk_len ); 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 ); } *(p++) = (unsigned char)( len >> 8 ); *(p++) = (unsigned char)( len ); p += 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 ); } *(p++) = (unsigned char)( zlen >> 8 ); *(p++) = (unsigned char)( zlen ); p += 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 ); *(p++) = (unsigned char)( psk_len >> 8 ); *(p++) = (unsigned char)( psk_len ); 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_KEY_EXCHANGE_SOME_PSK_ENABLED */ #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) 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 */ #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 */ /* * 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->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 ] = (unsigned char)( n >> 16 ); ssl->out_msg[i + 1] = (unsigned char)( n >> 8 ); ssl->out_msg[i + 2] = (unsigned char)( n ); i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n ); i += n; crt = crt->next; } ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 ); ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 ); ssl->out_msg[6] = (unsigned char)( ( 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) 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 */ 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 */ 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) static int ssl_srv_check_client_no_crt_notification( mbedtls_ssl_context *ssl ) { if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) return( -1 ); #if defined(MBEDTLS_SSL_PROTO_TLS1_2) 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, ( "TLSv1 client has no certificate" ) ); return( 0 ); } return( -1 ); #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ } #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 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 ); } 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 */ if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) && mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->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) 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 ); } 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 */ void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl, const mbedtls_ssl_ciphersuite_t *ciphersuite_info ) { ((void) ciphersuite_info); #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA384_C) if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) ssl->handshake->update_checksum = ssl_update_checksum_sha384; else #endif #if defined(MBEDTLS_SHA256_C) if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 ) ssl->handshake->update_checksum = ssl_update_checksum_sha256; else #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ { MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); return; } } void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort( &ssl->handshake->fin_sha256_psa ); psa_hash_setup( &ssl->handshake->fin_sha256_psa, PSA_ALG_SHA_256 ); #else mbedtls_sha256_starts( &ssl->handshake->fin_sha256, 0 ); #endif #endif #if defined(MBEDTLS_SHA384_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort( &ssl->handshake->fin_sha384_psa ); psa_hash_setup( &ssl->handshake->fin_sha384_psa, PSA_ALG_SHA_384 ); #else mbedtls_sha512_starts( &ssl->handshake->fin_sha512, 1 ); #endif #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ } static void ssl_update_checksum_start( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len ); #else mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len ); #endif #endif #if defined(MBEDTLS_SHA384_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len ); #else mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len ); #endif #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ } #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) { #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len ); #else mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len ); #endif } #endif #if defined(MBEDTLS_SHA384_C) static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) { #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len ); #else mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len ); #endif } #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) static void 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 mbedtls_sha256_context 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 ) { MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); return; } status = psa_hash_finish( &sha256_psa, padbuf, sizeof( padbuf ), &hash_size ); if( status != PSA_SUCCESS ) { MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); return; } MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 32 ); #else mbedtls_sha256_init( &sha256 ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) ); mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); /* * TLSv1.2: * hash = PRF( master, finished_label, * Hash( handshake ) )[0.11] */ #if !defined(MBEDTLS_SHA256_ALT) MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *) sha256.state, sizeof( sha256.state ) ); #endif mbedtls_sha256_finish( &sha256, padbuf ); mbedtls_sha256_free( &sha256 ); #endif /* MBEDTLS_USE_PSA_CRYPTO */ 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" ) ); } #endif /* MBEDTLS_SHA256_C */ #if defined(MBEDTLS_SHA384_C) static void 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 mbedtls_sha512_context sha512; #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 ) { MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); return; } status = psa_hash_finish( &sha384_psa, padbuf, sizeof( padbuf ), &hash_size ); if( status != PSA_SUCCESS ) { MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); return; } MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 48 ); #else mbedtls_sha512_init( &sha512 ); MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) ); mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); /* * TLSv1.2: * hash = PRF( master, finished_label, * Hash( handshake ) )[0.11] */ #if !defined(MBEDTLS_SHA512_ALT) MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *) sha512.state, sizeof( sha512.state ) ); #endif mbedtls_sha512_finish( &sha512, padbuf ); mbedtls_sha512_free( &sha512 ); #endif 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" ) ); } #endif /* MBEDTLS_SHA384_C */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ 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 swith 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_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 ); ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint ); /* * 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, 8 ); /* Set sequence_number to zero */ memset( ssl->cur_out_ctr + 2, 0, 6 ); /* 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, 8 ); 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; unsigned char buf[SSL_MAX_HASH_LEN]; MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) ); ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 ); if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) { MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); return( ret ); } 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 ); return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); } hash_len = 12; 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 ); return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); } 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 ); return( MBEDTLS_ERR_SSL_DECODE_ERROR ); } if( mbedtls_ssl_safer_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 ); return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE ); } #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" ) ); return( 0 ); } static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake ) { memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) ); #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) handshake->fin_sha256_psa = psa_hash_operation_init(); psa_hash_setup( &handshake->fin_sha256_psa, PSA_ALG_SHA_256 ); #else mbedtls_sha256_init( &handshake->fin_sha256 ); mbedtls_sha256_starts( &handshake->fin_sha256, 0 ); #endif #endif #if defined(MBEDTLS_SHA384_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) handshake->fin_sha384_psa = psa_hash_operation_init(); psa_hash_setup( &handshake->fin_sha384_psa, PSA_ALG_SHA_384 ); #else mbedtls_sha512_init( &handshake->fin_sha512 ); mbedtls_sha512_starts( &handshake->fin_sha512, 1 ); #endif #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ handshake->update_checksum = ssl_update_checksum_start; #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs ); #endif #if defined(MBEDTLS_DHM_C) mbedtls_dhm_init( &handshake->dhm_ctx ); #endif #if defined(MBEDTLS_ECDH_C) mbedtls_ecdh_init( &handshake->ecdh_ctx ); #endif #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) mbedtls_ecjpake_init( &handshake->ecjpake_ctx ); #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) ); mbedtls_cipher_init( &transform->cipher_ctx_enc ); mbedtls_cipher_init( &transform->cipher_ctx_dec ); #if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC) mbedtls_md_init( &transform->md_ctx_enc ); mbedtls_md_init( &transform->md_ctx_dec ); #endif } void mbedtls_ssl_session_init( mbedtls_ssl_session *session ) { memset( session, 0, sizeof(mbedtls_ssl_session) ); } static int ssl_handshake_init( mbedtls_ssl_context *ssl ) { /* Clear old handshake information if present */ if( ssl->transform_negotiate ) mbedtls_ssl_transform_free( ssl->transform_negotiate ); if( ssl->session_negotiate ) mbedtls_ssl_session_free( ssl->session_negotiate ); if( ssl->handshake ) mbedtls_ssl_handshake_free( ssl ); /* * 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) ); } 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 || ssl->transform_negotiate == NULL || ssl->session_negotiate == NULL ) { MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) ); mbedtls_free( ssl->handshake ); mbedtls_free( ssl->transform_negotiate ); mbedtls_free( ssl->session_negotiate ); ssl->handshake = NULL; ssl->transform_negotiate = NULL; ssl->session_negotiate = NULL; return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); } /* Initialize structures */ mbedtls_ssl_session_init( ssl->session_negotiate ); mbedtls_ssl_transform_init( ssl->transform_negotiate ); ssl_handshake_params_init( ssl->handshake ); #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 return( 0 ); } #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) /* Dummy cookie callbacks for defaults */ 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 ); } 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 ) ); } static int ssl_conf_version_check( const mbedtls_ssl_context *ssl ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL) if( mbedtls_ssl_conf_is_tls13_only( ssl->conf ) ) { if( ssl->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( ssl->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_EXPERIMENTAL) if( mbedtls_ssl_conf_is_hybrid_tls12_tls13( ssl->conf ) ) { MBEDTLS_SSL_DEBUG_MSG( 1, ( "Hybrid TLS 1.2 + TLS 1.3 configurations are not yet supported" ) ); return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); } #endif MBEDTLS_SSL_DEBUG_MSG( 1, ( "The SSL configuration is invalid." ) ); return( MBEDTLS_ERR_SSL_BAD_CONFIG ); } static int ssl_conf_check(const mbedtls_ssl_context *ssl) { int ret; ret = ssl_conf_version_check( ssl ); if( ret != 0 ) return( ret ); /* 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.) */ int mbedtls_ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial ) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; #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) ((void) partial); #endif ssl->state = MBEDTLS_SSL_HELLO_REQUEST; /* Cancel any possibly running timer */ mbedtls_ssl_set_timer( ssl, 0 ); #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->in_offt = NULL; mbedtls_ssl_reset_in_out_pointers( ssl ); ssl->in_msgtype = 0; ssl->in_msglen = 0; #if defined(MBEDTLS_SSL_PROTO_DTLS) ssl->next_record_offset = 0; ssl->in_epoch = 0; #endif #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) mbedtls_ssl_dtls_replay_reset( ssl ); #endif ssl->in_hslen = 0; ssl->nb_zero = 0; ssl->keep_current_message = 0; ssl->out_msgtype = 0; ssl->out_msglen = 0; ssl->out_left = 0; memset( ssl->cur_out_ctr, 0, sizeof( ssl->cur_out_ctr ) ); ssl->transform_in = NULL; ssl->transform_out = NULL; ssl->session_in = NULL; ssl->session_out = NULL; memset( ssl->out_buf, 0, out_buf_len ); #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) if( partial == 0 ) #endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ { ssl->in_left = 0; memset( ssl->in_buf, 0, in_buf_len ); } if( ssl->transform ) { mbedtls_ssl_transform_free( ssl->transform ); mbedtls_free( ssl->transform ); ssl->transform = 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) #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) if( partial == 0 ) #endif { 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( ( 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_EXPERIMENTAL) void mbedtls_ssl_conf_tls13_key_exchange_modes( mbedtls_ssl_config *conf, const int kex_modes ) { conf->tls13_kex_modes = kex_modes; } #endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */ #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; } /* Append a new keycert entry to a (possibly empty) list */ 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; 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 is 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) 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; } 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) /* * Set EC J-PAKE password for current handshake */ 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 ); 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_KEY_EXCHANGE_ECJPAKE_ENABLED */ #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) static int ssl_conf_psk_is_configured( mbedtls_ssl_config const *conf ) { #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 ) 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; } /* This and the following branch should never * be taken simultaenously as we maintain the * invariant that raw and opaque PSKs are never * configured simultaneously. As a safeguard, * though, `else` is omitted here. */ #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. */ 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 >> 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( ssl_conf_psk_is_configured( 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 ) ) { ssl->handshake->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT; } else #endif /* MBEDTLS_USE_PSA_CRYPTO */ 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; } } int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl, const unsigned char *psk, size_t psk_len ) { 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( ( 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 ); } #if defined(MBEDTLS_USE_PSA_CRYPTO) int mbedtls_ssl_conf_psk_opaque( mbedtls_ssl_config *conf, psa_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( ssl_conf_psk_is_configured( 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, psa_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 */ 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_KEY_EXCHANGE_SOME_PSK_ENABLED */ #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; 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; 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_KEY_EXCHANGE_WITH_CERT_ENABLED) /* * 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_KEY_EXCHANGE_WITH_CERT_ENABLED */ #if defined(MBEDTLS_ECP_C) /* * Set the allowed elliptic curves */ void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf, const mbedtls_ecp_group_id *curve_list ) { conf->curve_list = curve_list; } #endif /* MBEDTLS_ECP_C */ #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 */ void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor ) { conf->max_major_ver = major; conf->max_minor_ver = minor; } void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor ) { conf->min_major_ver = major; conf->min_minor_ver = minor; } #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) 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 */ #if defined(MBEDTLS_SSL_EXPORT_KEYS) 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; } #endif #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 ); } 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->minor_ver ) { case MBEDTLS_SSL_MINOR_VERSION_3: return( "DTLSv1.2" ); default: return( "unknown (DTLS)" ); } } #endif switch( ssl->minor_ver ) { case MBEDTLS_SSL_MINOR_VERSION_3: return( "TLSv1.2" ); 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; /* 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 ); } /* 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, ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 8 ) & 0xFF, ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 0 ) & 0xFF, }; /* * 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-version. Possible values: * // - TLS 1.2 (MBEDTLS_SSL_MINOR_VERSION_3) * * select (serialized_session.minor_ver) { * * case MBEDTLS_SSL_MINOR_VERSION_3: // TLS 1.2 * serialized_session_tls12 data; * * }; * * } serialized_session; * */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) /* Serialization of TLS 1.2 sessions: * * struct { * uint64 start_time; * uint8 ciphersuite[2]; // defined by the standard * uint8 compression; // 0 or 1 * 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_session_save_tls12( 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; *p++ = (unsigned char)( ( start >> 56 ) & 0xFF ); *p++ = (unsigned char)( ( start >> 48 ) & 0xFF ); *p++ = (unsigned char)( ( start >> 40 ) & 0xFF ); *p++ = (unsigned char)( ( start >> 32 ) & 0xFF ); *p++ = (unsigned char)( ( start >> 24 ) & 0xFF ); *p++ = (unsigned char)( ( start >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( start >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( start ) & 0xFF ); } #endif /* MBEDTLS_HAVE_TIME */ /* * Basic mandatory fields */ used += 2 /* ciphersuite */ + 1 /* compression */ + 1 /* id_len */ + sizeof( session->id ) + sizeof( session->master ) + 4; /* verify_result */ if( used <= buf_len ) { *p++ = (unsigned char)( ( session->ciphersuite >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( session->ciphersuite ) & 0xFF ); *p++ = (unsigned char)( session->compression & 0xFF ); *p++ = (unsigned char)( session->id_len & 0xFF ); memcpy( p, session->id, 32 ); p += 32; memcpy( p, session->master, 48 ); p += 48; *p++ = (unsigned char)( ( session->verify_result >> 24 ) & 0xFF ); *p++ = (unsigned char)( ( session->verify_result >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( session->verify_result >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( session->verify_result ) & 0xFF ); } /* * 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++ = (unsigned char)( ( cert_len >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( cert_len >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( cert_len ) & 0xFF ); 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++ = (unsigned char)( ( session->ticket_len >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( session->ticket_len >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( session->ticket_len ) & 0xFF ); if( session->ticket != NULL ) { memcpy( p, session->ticket, session->ticket_len ); p += session->ticket_len; } *p++ = (unsigned char)( ( session->ticket_lifetime >> 24 ) & 0xFF ); *p++ = (unsigned char)( ( session->ticket_lifetime >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( session->ticket_lifetime >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( session->ticket_lifetime ) & 0xFF ); } #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++ = (unsigned char)( ( session->encrypt_then_mac ) & 0xFF ); #endif return( used ); } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ 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; 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++ = session->minor_ver; } /* Forward to version-specific serialization routine. */ switch( session->minor_ver ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) case MBEDTLS_SSL_MINOR_VERSION_3: { size_t remaining_len = used <= buf_len ? buf_len - used : 0; used += ssl_session_save_tls12( session, p, remaining_len ); break; } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ 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. */ static int ssl_session_load_tls12( 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 + 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->compression = *p++; 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 ); } 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; 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->minor_ver = *p++; /* Dispatch according to TLS version. */ switch( session->minor_ver ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) case MBEDTLS_SSL_MINOR_VERSION_3: /* TLS 1.2 */ { size_t remaining_len = ( end - p ); return( ssl_session_load_tls12( session, p, remaining_len ) ); } #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ 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 */ int mbedtls_ssl_handshake_step( 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_CLI_C) if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL) if( mbedtls_ssl_conf_is_tls13_only( ssl->conf ) ) ret = mbedtls_ssl_handshake_client_step_tls1_3( ssl ); #endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if( mbedtls_ssl_conf_is_tls12_only( ssl->conf ) ) ret = mbedtls_ssl_handshake_client_step( ssl ); #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ } #endif #if defined(MBEDTLS_SSL_SRV_C) if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL) if( mbedtls_ssl_conf_is_tls13_only( ssl->conf ) ) ret = mbedtls_ssl_handshake_server_step_tls1_3( ssl ); #endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */ #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 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 */ 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( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) 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( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) 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 */ #if defined(MBEDTLS_X509_CRT_PARSE_C) 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; } } #endif /* MBEDTLS_X509_CRT_PARSE_C */ void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl ) { mbedtls_ssl_handshake_params *handshake = ssl->handshake; if( handshake == NULL ) return; #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_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SHA256_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort( &handshake->fin_sha256_psa ); #else mbedtls_sha256_free( &handshake->fin_sha256 ); #endif #endif #if defined(MBEDTLS_SHA384_C) #if defined(MBEDTLS_USE_PSA_CRYPTO) psa_hash_abort( &handshake->fin_sha384_psa ); #else mbedtls_sha512_free( &handshake->fin_sha512 ); #endif #endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #if defined(MBEDTLS_DHM_C) mbedtls_dhm_free( &handshake->dhm_ctx ); #endif #if defined(MBEDTLS_ECDH_C) mbedtls_ecdh_free( &handshake->ecdh_ctx ); #endif #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) mbedtls_ecjpake_free( &handshake->ecjpake_ctx ); #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 ); #endif #if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED) if( handshake->psk != NULL ) { mbedtls_platform_zeroize( handshake->psk, handshake->psk_len ); mbedtls_free( handshake->psk ); } #endif #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 */ if( handshake->sni_key_cert != NULL ) { mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next; while( cur != NULL ) { next = cur->next; mbedtls_free( cur ); cur = next; } } #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_PROTO_DTLS) mbedtls_free( handshake->verify_cookie ); mbedtls_ssl_flight_free( handshake->flight ); mbedtls_ssl_buffering_free( ssl ); #endif #if defined(MBEDTLS_ECDH_C) && \ defined(MBEDTLS_USE_PSA_CRYPTO) psa_destroy_key( handshake->ecdh_psa_privkey ); #endif /* MBEDTLS_ECDH_C && MBEDTLS_USE_PSA_CRYPTO */ mbedtls_platform_zeroize( handshake, sizeof( mbedtls_ssl_handshake_params ) ); #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 } 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) 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, ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 8 ) & 0xFF, ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 0 ) & 0xFF, ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 16 ) & 0xFF, ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 8 ) & 0xFF, ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 0 ) & 0xFF, }; /* * 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( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) { 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 DLTS, 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->major_ver != MBEDTLS_SSL_MAJOR_VERSION_3 ) { MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only version 1.2 supported" ) ); return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); } if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) { 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 ) { *p++ = (unsigned char)( ( session_len >> 24 ) & 0xFF ); *p++ = (unsigned char)( ( session_len >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( session_len >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( session_len ) & 0xFF ); 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 ) { *p++ = (unsigned char)( ( ssl->badmac_seen >> 24 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->badmac_seen >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->badmac_seen >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->badmac_seen ) & 0xFF ); } #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) used += 16; if( used <= buf_len ) { *p++ = (unsigned char)( ( ssl->in_window_top >> 56 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window_top >> 48 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window_top >> 40 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window_top >> 32 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window_top >> 24 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window_top >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window_top >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window_top ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window >> 56 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window >> 48 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window >> 40 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window >> 32 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window >> 24 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window >> 16 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->in_window ) & 0xFF ); } #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 += 8; if( used <= buf_len ) { memcpy( p, ssl->cur_out_ctr, 8 ); p += 8; } #if defined(MBEDTLS_SSL_PROTO_DTLS) used += 2; if( used <= buf_len ) { *p++ = (unsigned char)( ( ssl->mtu >> 8 ) & 0xFF ); *p++ = (unsigned char)( ( ssl->mtu ) & 0xFF ); } #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 ) ); } /* * Helper to get TLS 1.2 PRF from ciphersuite * (Duplicates bits of logic from ssl_set_handshake_prfs().) */ 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 ) { #if defined(MBEDTLS_SHA384_C) const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuite_id ); if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) return( tls_prf_sha384 ); #else (void) ciphersuite_id; #endif return( tls_prf_sha256 ); } /* * 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. */ 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; /* * 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_major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 || ssl->conf->min_major_ver > MBEDTLS_SSL_MAJOR_VERSION_3 || ssl->conf->max_minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 || ssl->conf->min_minor_ver > MBEDTLS_SSL_MINOR_VERSION_3 || #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(). */ ssl->transform = ssl->transform_negotiate; ssl->transform_in = ssl->transform; ssl->transform_out = ssl->transform; ssl->transform_negotiate = NULL; /* 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_MAC) && \ defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) ssl->session->encrypt_then_mac, #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC && MBEDTLS_SSL_SOME_SUITES_USE_MAC */ ssl_tls12prf_from_cs( ssl->session->ciphersuite ), p, /* currently pointing to randbytes */ MBEDTLS_SSL_MINOR_VERSION_3, /* (D)TLS 1.2 is forced */ ssl->conf->endpoint, ssl ); if( ret != 0 ) return( ret ); 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 ) < 8 ) return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); memcpy( ssl->cur_out_ctr, p, 8 ); p += 8; #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->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; ssl->minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* 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_ssl_transform_free( ssl->transform_negotiate ); mbedtls_ssl_session_free( ssl->session_negotiate ); mbedtls_free( ssl->handshake ); mbedtls_free( ssl->transform_negotiate ); mbedtls_free( ssl->session_negotiate ); } 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 ) ); } /* * Initialze mbedtls_ssl_config */ void mbedtls_ssl_config_init( mbedtls_ssl_config *conf ) { memset( conf, 0, sizeof( mbedtls_ssl_config ) ); } #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) /* The selection should be the same as mbedtls_x509_crt_profile_default in * x509_crt.c. Here, the order matters. Currently we favor stronger hashes, * for no fundamental reason. * See the documentation of mbedtls_ssl_conf_curves() for what we promise * about this list. */ static int ssl_preset_default_hashes[] = { #if defined(MBEDTLS_SHA512_C) MBEDTLS_MD_SHA512, #endif #if defined(MBEDTLS_SHA384_C) MBEDTLS_MD_SHA384, #endif #if defined(MBEDTLS_SHA256_C) MBEDTLS_MD_SHA256, #endif MBEDTLS_MD_NONE }; #endif #if defined(MBEDTLS_ECP_C) /* 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 mbedtls_ecp_group_id ssl_preset_default_curves[] = { #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) MBEDTLS_ECP_DP_CURVE25519, #endif #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) MBEDTLS_ECP_DP_SECP256R1, #endif #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) MBEDTLS_ECP_DP_SECP384R1, #endif #if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED) MBEDTLS_ECP_DP_CURVE448, #endif #if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED) MBEDTLS_ECP_DP_SECP521R1, #endif #if defined(MBEDTLS_ECP_DP_BP256R1_ENABLED) MBEDTLS_ECP_DP_BP256R1, #endif #if defined(MBEDTLS_ECP_DP_BP384R1_ENABLED) MBEDTLS_ECP_DP_BP384R1, #endif #if defined(MBEDTLS_ECP_DP_BP512R1_ENABLED) MBEDTLS_ECP_DP_BP512R1, #endif MBEDTLS_ECP_DP_NONE }; #endif 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_KEY_EXCHANGE_WITH_CERT_ENABLED) static int ssl_preset_suiteb_hashes[] = { MBEDTLS_MD_SHA256, MBEDTLS_MD_SHA384, MBEDTLS_MD_NONE }; #endif #if defined(MBEDTLS_ECP_C) static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = { #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) MBEDTLS_ECP_DP_SECP256R1, #endif #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) MBEDTLS_ECP_DP_SECP384R1, #endif MBEDTLS_ECP_DP_NONE }; #endif /* * 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 /* 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_EXPERIMENTAL) /* * Allow all TLS 1.3 key exchange modes by default. */ conf->tls13_kex_modes = MBEDTLS_SSL_TLS13_KEY_EXCHANGE_MODE_ALL; #endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */ /* * Preset-specific defaults */ switch( preset ) { /* * NSA Suite B */ case MBEDTLS_SSL_PRESET_SUITEB: conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */ conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; 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_KEY_EXCHANGE_WITH_CERT_ENABLED) conf->sig_hashes = ssl_preset_suiteb_hashes; #endif #if defined(MBEDTLS_ECP_C) conf->curve_list = ssl_preset_suiteb_curves; #endif break; /* * Default */ default: conf->min_major_ver = ( MBEDTLS_SSL_MIN_MAJOR_VERSION > MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION ) ? MBEDTLS_SSL_MIN_MAJOR_VERSION : MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION; conf->min_minor_ver = ( MBEDTLS_SSL_MIN_MINOR_VERSION > MBEDTLS_SSL_MIN_VALID_MINOR_VERSION ) ? MBEDTLS_SSL_MIN_MINOR_VERSION : MBEDTLS_SSL_MIN_VALID_MINOR_VERSION; conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; #if defined(MBEDTLS_SSL_PROTO_DTLS) if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; #endif 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_KEY_EXCHANGE_WITH_CERT_ENABLED) conf->sig_hashes = ssl_preset_default_hashes; #endif #if defined(MBEDTLS_ECP_C) conf->curve_list = ssl_preset_default_curves; #endif #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_KEY_EXCHANGE_SOME_PSK_ENABLED) 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 #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_ECDSA_C) ) /* * 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_ECDSA_C) 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_ECDSA_C) case MBEDTLS_SSL_SIG_ECDSA: return( MBEDTLS_PK_ECDSA ); #endif default: return( MBEDTLS_PK_NONE ); } } #endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) /* Find an entry in a signature-hash set matching a given hash algorithm. */ mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set, mbedtls_pk_type_t sig_alg ) { switch( sig_alg ) { case MBEDTLS_PK_RSA: return( set->rsa ); case MBEDTLS_PK_ECDSA: return( set->ecdsa ); default: return( MBEDTLS_MD_NONE ); } } /* Add a signature-hash-pair to a signature-hash set */ void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set, mbedtls_pk_type_t sig_alg, mbedtls_md_type_t md_alg ) { switch( sig_alg ) { case MBEDTLS_PK_RSA: if( set->rsa == MBEDTLS_MD_NONE ) set->rsa = md_alg; break; case MBEDTLS_PK_ECDSA: if( set->ecdsa == MBEDTLS_MD_NONE ) set->ecdsa = md_alg; break; default: break; } } /* Allow exactly one hash algorithm for each signature. */ void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set, mbedtls_md_type_t md_alg ) { set->rsa = md_alg; set->ecdsa = md_alg; } #endif /* MBEDTLS_SSL_PROTO_TLS1_2) && MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ /* * 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_MD5_C) case MBEDTLS_SSL_HASH_MD5: return( MBEDTLS_MD_MD5 ); #endif #if defined(MBEDTLS_SHA1_C) case MBEDTLS_SSL_HASH_SHA1: return( MBEDTLS_MD_SHA1 ); #endif #if defined(MBEDTLS_SHA224_C) case MBEDTLS_SSL_HASH_SHA224: return( MBEDTLS_MD_SHA224 ); #endif #if defined(MBEDTLS_SHA256_C) case MBEDTLS_SSL_HASH_SHA256: return( MBEDTLS_MD_SHA256 ); #endif #if defined(MBEDTLS_SHA384_C) case MBEDTLS_SSL_HASH_SHA384: return( MBEDTLS_MD_SHA384 ); #endif #if defined(MBEDTLS_SHA512_C) 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_MD5_C) case MBEDTLS_MD_MD5: return( MBEDTLS_SSL_HASH_MD5 ); #endif #if defined(MBEDTLS_SHA1_C) case MBEDTLS_MD_SHA1: return( MBEDTLS_SSL_HASH_SHA1 ); #endif #if defined(MBEDTLS_SHA224_C) case MBEDTLS_MD_SHA224: return( MBEDTLS_SSL_HASH_SHA224 ); #endif #if defined(MBEDTLS_SHA256_C) case MBEDTLS_MD_SHA256: return( MBEDTLS_SSL_HASH_SHA256 ); #endif #if defined(MBEDTLS_SHA384_C) case MBEDTLS_MD_SHA384: return( MBEDTLS_SSL_HASH_SHA384 ); #endif #if defined(MBEDTLS_SHA512_C) case MBEDTLS_MD_SHA512: return( MBEDTLS_SSL_HASH_SHA512 ); #endif default: return( MBEDTLS_SSL_HASH_NONE ); } } #if defined(MBEDTLS_ECP_C) /* * 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( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id ) { const mbedtls_ecp_group_id *gid; if( ssl->conf->curve_list == NULL ) return( -1 ); for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ ) if( *gid == grp_id ) return( 0 ); return( -1 ); } #endif /* MBEDTLS_ECP_C */ #if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED) /* * Check if a hash proposed by the peer is in our list. * Return 0 if we're willing to use it, -1 otherwise. */ int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl, mbedtls_md_type_t md ) { const int *cur; if( ssl->conf->sig_hashes == NULL ) return( -1 ); for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ ) if( *cur == (int) md ) return( 0 ); return( -1 ); } #endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */ #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 */ int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md ) { #if defined(MBEDTLS_SSL_PROTO_TLS1_2) if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) return( -1 ); switch( md ) { #if defined(MBEDTLS_SHA384_C) case MBEDTLS_SSL_HASH_SHA384: ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384; break; #endif #if defined(MBEDTLS_SHA256_C) case MBEDTLS_SSL_HASH_SHA256: ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256; break; #endif default: return( -1 ); } return 0; #else /* !MBEDTLS_SSL_PROTO_TLS1_2 */ (void) ssl; (void) md; return( -1 ); #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ } #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #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_psa_translate_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, MBEDTLS_MD_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 */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #endif /* MBEDTLS_SSL_TLS_C */