1488 lines
51 KiB
C
1488 lines
51 KiB
C
/*
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* TLS 1.3 functionality shared between client and server
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_SSL_TLS_C) && defined(MBEDTLS_SSL_PROTO_TLS1_3)
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#include <string.h>
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#include "mbedtls/error.h"
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#include "mbedtls/debug.h"
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#include "mbedtls/oid.h"
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#include "mbedtls/platform.h"
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#include "mbedtls/constant_time.h"
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#include <string.h>
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#include "ssl_misc.h"
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#include "ssl_tls13_invasive.h"
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#include "ssl_tls13_keys.h"
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#include "ssl_debug_helpers.h"
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#include "psa/crypto.h"
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#include "mbedtls/psa_util.h"
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const uint8_t mbedtls_ssl_tls13_hello_retry_request_magic[
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MBEDTLS_SERVER_HELLO_RANDOM_LEN ] =
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{ 0xCF, 0x21, 0xAD, 0x74, 0xE5, 0x9A, 0x61, 0x11,
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0xBE, 0x1D, 0x8C, 0x02, 0x1E, 0x65, 0xB8, 0x91,
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0xC2, 0xA2, 0x11, 0x16, 0x7A, 0xBB, 0x8C, 0x5E,
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0x07, 0x9E, 0x09, 0xE2, 0xC8, 0xA8, 0x33, 0x9C };
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int mbedtls_ssl_tls13_fetch_handshake_msg( mbedtls_ssl_context *ssl,
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unsigned hs_type,
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unsigned char **buf,
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size_t *buf_len )
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{
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int ret;
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if( ( ret = mbedtls_ssl_read_record( ssl, 0 ) ) != 0 )
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{
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MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
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goto cleanup;
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}
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if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ||
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ssl->in_msg[0] != hs_type )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "Receive unexpected handshake message." ) );
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MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE,
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MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
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ret = MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE;
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goto cleanup;
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}
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/*
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* Jump handshake header (4 bytes, see Section 4 of RFC 8446).
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* ...
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* HandshakeType msg_type;
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* uint24 length;
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* ...
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*/
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*buf = ssl->in_msg + 4;
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*buf_len = ssl->in_hslen - 4;
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cleanup:
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return( ret );
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}
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#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
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/*
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* STATE HANDLING: Read CertificateVerify
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*/
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/* Macro to express the maximum length of the verify structure.
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*
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* The structure is computed per TLS 1.3 specification as:
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* - 64 bytes of octet 32,
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* - 33 bytes for the context string
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* (which is either "TLS 1.3, client CertificateVerify"
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* or "TLS 1.3, server CertificateVerify"),
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* - 1 byte for the octet 0x0, which serves as a separator,
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* - 32 or 48 bytes for the Transcript-Hash(Handshake Context, Certificate)
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* (depending on the size of the transcript_hash)
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*
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* This results in a total size of
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* - 130 bytes for a SHA256-based transcript hash, or
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* (64 + 33 + 1 + 32 bytes)
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* - 146 bytes for a SHA384-based transcript hash.
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* (64 + 33 + 1 + 48 bytes)
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*
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*/
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#define SSL_VERIFY_STRUCT_MAX_SIZE ( 64 + \
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33 + \
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1 + \
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MBEDTLS_TLS1_3_MD_MAX_SIZE \
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)
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/*
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* The ssl_tls13_create_verify_structure() creates the verify structure.
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* As input, it requires the transcript hash.
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*
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* The caller has to ensure that the buffer has size at least
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* SSL_VERIFY_STRUCT_MAX_SIZE bytes.
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*/
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static void ssl_tls13_create_verify_structure( const unsigned char *transcript_hash,
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size_t transcript_hash_len,
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unsigned char *verify_buffer,
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size_t *verify_buffer_len,
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int from )
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{
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size_t idx;
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/* RFC 8446, Section 4.4.3:
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*
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* The digital signature [in the CertificateVerify message] is then
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* computed over the concatenation of:
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* - A string that consists of octet 32 (0x20) repeated 64 times
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* - The context string
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* - A single 0 byte which serves as the separator
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* - The content to be signed
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*/
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memset( verify_buffer, 0x20, 64 );
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idx = 64;
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if( from == MBEDTLS_SSL_IS_CLIENT )
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{
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memcpy( verify_buffer + idx, MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( client_cv ) );
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idx += MBEDTLS_SSL_TLS1_3_LBL_LEN( client_cv );
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}
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else
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{ /* from == MBEDTLS_SSL_IS_SERVER */
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memcpy( verify_buffer + idx, MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( server_cv ) );
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idx += MBEDTLS_SSL_TLS1_3_LBL_LEN( server_cv );
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}
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verify_buffer[idx++] = 0x0;
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memcpy( verify_buffer + idx, transcript_hash, transcript_hash_len );
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idx += transcript_hash_len;
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*verify_buffer_len = idx;
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}
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MBEDTLS_CHECK_RETURN_CRITICAL
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static int ssl_tls13_parse_certificate_verify( mbedtls_ssl_context *ssl,
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const unsigned char *buf,
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const unsigned char *end,
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const unsigned char *verify_buffer,
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size_t verify_buffer_len )
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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const unsigned char *p = buf;
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uint16_t algorithm;
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size_t signature_len;
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mbedtls_pk_type_t sig_alg;
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mbedtls_md_type_t md_alg;
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psa_algorithm_t hash_alg = PSA_ALG_NONE;
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unsigned char verify_hash[PSA_HASH_MAX_SIZE];
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size_t verify_hash_len;
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void const *options = NULL;
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#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
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mbedtls_pk_rsassa_pss_options rsassa_pss_options;
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#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
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/*
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* struct {
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* SignatureScheme algorithm;
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* opaque signature<0..2^16-1>;
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* } CertificateVerify;
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*/
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MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
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algorithm = MBEDTLS_GET_UINT16_BE( p, 0 );
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p += 2;
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/* RFC 8446 section 4.4.3
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*
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* If the CertificateVerify message is sent by a server, the signature algorithm
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* MUST be one offered in the client's "signature_algorithms" extension unless
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* no valid certificate chain can be produced without unsupported algorithms
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*
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* RFC 8446 section 4.4.2.2
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*
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* If the client cannot construct an acceptable chain using the provided
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* certificates and decides to abort the handshake, then it MUST abort the handshake
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* with an appropriate certificate-related alert (by default, "unsupported_certificate").
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*
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* Check if algorithm is an offered signature algorithm.
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*/
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if( ! mbedtls_ssl_sig_alg_is_offered( ssl, algorithm ) )
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{
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/* algorithm not in offered signature algorithms list */
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "Received signature algorithm(%04x) is not "
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"offered.",
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( unsigned int ) algorithm ) );
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goto error;
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}
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if( mbedtls_ssl_get_pk_type_and_md_alg_from_sig_alg(
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algorithm, &sig_alg, &md_alg ) != 0 )
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{
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goto error;
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}
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hash_alg = mbedtls_hash_info_psa_from_md( md_alg );
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if( hash_alg == 0 )
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{
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goto error;
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}
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MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate Verify: Signature algorithm ( %04x )",
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( unsigned int ) algorithm ) );
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/*
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* Check the certificate's key type matches the signature alg
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*/
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if( !mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, sig_alg ) )
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{
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "signature algorithm doesn't match cert key" ) );
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goto error;
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}
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MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
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signature_len = MBEDTLS_GET_UINT16_BE( p, 0 );
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p += 2;
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MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, signature_len );
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status = psa_hash_compute( hash_alg,
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verify_buffer,
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verify_buffer_len,
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verify_hash,
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sizeof( verify_hash ),
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&verify_hash_len );
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if( status != PSA_SUCCESS )
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{
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MBEDTLS_SSL_DEBUG_RET( 1, "hash computation PSA error", status );
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goto error;
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}
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MBEDTLS_SSL_DEBUG_BUF( 3, "verify hash", verify_hash, verify_hash_len );
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#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
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if( sig_alg == MBEDTLS_PK_RSASSA_PSS )
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{
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rsassa_pss_options.mgf1_hash_id = md_alg;
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rsassa_pss_options.expected_salt_len = PSA_HASH_LENGTH( hash_alg );
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options = (const void*) &rsassa_pss_options;
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}
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#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
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if( ( ret = mbedtls_pk_verify_ext( sig_alg, options,
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&ssl->session_negotiate->peer_cert->pk,
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md_alg, verify_hash, verify_hash_len,
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p, signature_len ) ) == 0 )
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{
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return( 0 );
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}
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MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify_ext", ret );
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error:
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/* RFC 8446 section 4.4.3
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*
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* If the verification fails, the receiver MUST terminate the handshake
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* with a "decrypt_error" alert.
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*/
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MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR,
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MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
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return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
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}
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#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
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int mbedtls_ssl_tls13_process_certificate_verify( mbedtls_ssl_context *ssl )
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{
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#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char verify_buffer[SSL_VERIFY_STRUCT_MAX_SIZE];
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size_t verify_buffer_len;
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unsigned char transcript[MBEDTLS_TLS1_3_MD_MAX_SIZE];
|
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size_t transcript_len;
|
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unsigned char *buf;
|
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size_t buf_len;
|
|
|
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MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
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|
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MBEDTLS_SSL_PROC_CHK(
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mbedtls_ssl_tls13_fetch_handshake_msg( ssl,
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MBEDTLS_SSL_HS_CERTIFICATE_VERIFY, &buf, &buf_len ) );
|
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|
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/* Need to calculate the hash of the transcript first
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* before reading the message since otherwise it gets
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* included in the transcript
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*/
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ret = mbedtls_ssl_get_handshake_transcript( ssl,
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ssl->handshake->ciphersuite_info->mac,
|
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transcript, sizeof( transcript ),
|
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&transcript_len );
|
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if( ret != 0 )
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{
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MBEDTLS_SSL_PEND_FATAL_ALERT(
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MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR,
|
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MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
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return( ret );
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}
|
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|
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MBEDTLS_SSL_DEBUG_BUF( 3, "handshake hash", transcript, transcript_len );
|
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|
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/* Create verify structure */
|
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ssl_tls13_create_verify_structure( transcript,
|
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transcript_len,
|
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verify_buffer,
|
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&verify_buffer_len,
|
|
( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) ?
|
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MBEDTLS_SSL_IS_SERVER :
|
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MBEDTLS_SSL_IS_CLIENT );
|
|
|
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/* Process the message contents */
|
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MBEDTLS_SSL_PROC_CHK( ssl_tls13_parse_certificate_verify( ssl, buf,
|
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buf + buf_len, verify_buffer, verify_buffer_len ) );
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|
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mbedtls_ssl_add_hs_msg_to_checksum( ssl, MBEDTLS_SSL_HS_CERTIFICATE_VERIFY,
|
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buf, buf_len );
|
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|
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cleanup:
|
|
|
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MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_process_certificate_verify", ret );
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return( ret );
|
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#else
|
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((void) ssl);
|
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MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
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#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
|
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}
|
|
|
|
/*
|
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*
|
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* STATE HANDLING: Incoming Certificate.
|
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*
|
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*/
|
|
|
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#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
|
|
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
|
|
/*
|
|
* Structure of Certificate message:
|
|
*
|
|
* enum {
|
|
* X509(0),
|
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* RawPublicKey(2),
|
|
* (255)
|
|
* } CertificateType;
|
|
*
|
|
* struct {
|
|
* select (certificate_type) {
|
|
* case RawPublicKey:
|
|
* * From RFC 7250 ASN.1_subjectPublicKeyInfo *
|
|
* opaque ASN1_subjectPublicKeyInfo<1..2^24-1>;
|
|
* case X509:
|
|
* opaque cert_data<1..2^24-1>;
|
|
* };
|
|
* Extension extensions<0..2^16-1>;
|
|
* } CertificateEntry;
|
|
*
|
|
* struct {
|
|
* opaque certificate_request_context<0..2^8-1>;
|
|
* CertificateEntry certificate_list<0..2^24-1>;
|
|
* } Certificate;
|
|
*
|
|
*/
|
|
|
|
/* Parse certificate chain send by the server. */
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
MBEDTLS_STATIC_TESTABLE
|
|
int mbedtls_ssl_tls13_parse_certificate( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
const unsigned char *end )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t certificate_request_context_len = 0;
|
|
size_t certificate_list_len = 0;
|
|
const unsigned char *p = buf;
|
|
const unsigned char *certificate_list_end;
|
|
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 4 );
|
|
certificate_request_context_len = p[0];
|
|
certificate_list_len = MBEDTLS_GET_UINT24_BE( p, 1 );
|
|
p += 4;
|
|
|
|
/* In theory, the certificate list can be up to 2^24 Bytes, but we don't
|
|
* support anything beyond 2^16 = 64K.
|
|
*/
|
|
if( ( certificate_request_context_len != 0 ) ||
|
|
( certificate_list_len >= 0x10000 ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
|
|
MBEDTLS_ERR_SSL_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
|
|
}
|
|
|
|
/* In case we tried to reuse a session but it failed */
|
|
if( ssl->session_negotiate->peer_cert != NULL )
|
|
{
|
|
mbedtls_x509_crt_free( ssl->session_negotiate->peer_cert );
|
|
mbedtls_free( ssl->session_negotiate->peer_cert );
|
|
}
|
|
|
|
if( certificate_list_len == 0 )
|
|
{
|
|
ssl->session_negotiate->peer_cert = NULL;
|
|
ret = 0;
|
|
goto exit;
|
|
}
|
|
|
|
if( ( ssl->session_negotiate->peer_cert =
|
|
mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ) ) == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc( %" MBEDTLS_PRINTF_SIZET " bytes ) failed",
|
|
sizeof( mbedtls_x509_crt ) ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR,
|
|
MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
|
|
}
|
|
|
|
mbedtls_x509_crt_init( ssl->session_negotiate->peer_cert );
|
|
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, certificate_list_len );
|
|
certificate_list_end = p + certificate_list_len;
|
|
while( p < certificate_list_end )
|
|
{
|
|
size_t cert_data_len, extensions_len;
|
|
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, certificate_list_end, 3 );
|
|
cert_data_len = MBEDTLS_GET_UINT24_BE( p, 0 );
|
|
p += 3;
|
|
|
|
/* In theory, the CRT can be up to 2^24 Bytes, but we don't support
|
|
* anything beyond 2^16 = 64K. Otherwise as in the TLS 1.2 code,
|
|
* check that we have a minimum of 128 bytes of data, this is not
|
|
* clear why we need that though.
|
|
*/
|
|
if( ( cert_data_len < 128 ) || ( cert_data_len >= 0x10000 ) )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad Certificate message" ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
|
|
MBEDTLS_ERR_SSL_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
|
|
}
|
|
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, certificate_list_end, cert_data_len );
|
|
ret = mbedtls_x509_crt_parse_der( ssl->session_negotiate->peer_cert,
|
|
p, cert_data_len );
|
|
|
|
switch( ret )
|
|
{
|
|
case 0: /*ok*/
|
|
break;
|
|
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:
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR,
|
|
MBEDTLS_ERR_X509_ALLOC_FAILED );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
|
|
return( ret );
|
|
|
|
case MBEDTLS_ERR_X509_UNKNOWN_VERSION:
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT,
|
|
MBEDTLS_ERR_X509_UNKNOWN_VERSION );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
|
|
return( ret );
|
|
|
|
default:
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_BAD_CERT,
|
|
ret );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
|
|
return( ret );
|
|
}
|
|
|
|
p += cert_data_len;
|
|
|
|
/* Certificate extensions length */
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, certificate_list_end, 2 );
|
|
extensions_len = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
p += 2;
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, certificate_list_end, extensions_len );
|
|
p += extensions_len;
|
|
}
|
|
|
|
exit:
|
|
/* Check that all the message is consumed. */
|
|
if( p != end )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad Certificate message" ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR, \
|
|
MBEDTLS_ERR_SSL_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert );
|
|
|
|
return( ret );
|
|
}
|
|
#else
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
MBEDTLS_STATIC_TESTABLE
|
|
int mbedtls_ssl_tls13_parse_certificate( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
const unsigned char *end )
|
|
{
|
|
((void) ssl);
|
|
((void) buf);
|
|
((void) end);
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
|
|
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
|
|
/* Validate certificate chain sent by the server. */
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
static int ssl_tls13_validate_certificate( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = 0;
|
|
int authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
|
|
mbedtls_x509_crt *ca_chain;
|
|
mbedtls_x509_crl *ca_crl;
|
|
const char *ext_oid;
|
|
size_t ext_len;
|
|
uint32_t verify_result = 0;
|
|
|
|
/* If SNI was used, overwrite authentication mode
|
|
* from the configuration. */
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
{
|
|
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
|
|
if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
|
|
authmode = ssl->handshake->sni_authmode;
|
|
else
|
|
#endif
|
|
authmode = ssl->conf->authmode;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If the peer hasn't sent a certificate ( i.e. it sent
|
|
* an empty certificate chain ), this is reflected in the peer CRT
|
|
* structure being unset.
|
|
* Check for that and handle it depending on the
|
|
* authentication mode.
|
|
*/
|
|
if( ssl->session_negotiate->peer_cert == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer has no certificate" ) );
|
|
|
|
#if defined(MBEDTLS_SSL_SRV_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
|
|
{
|
|
/* The client was asked for a certificate but didn't send
|
|
* one. The client should know what's going on, so we
|
|
* don't send an alert.
|
|
*/
|
|
ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
|
|
if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
|
|
return( 0 );
|
|
else
|
|
{
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_NO_CERT,
|
|
MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
|
|
return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_SSL_SRV_C */
|
|
|
|
#if defined(MBEDTLS_SSL_CLI_C)
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_NO_CERT,
|
|
MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE );
|
|
return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE );
|
|
}
|
|
#endif /* MBEDTLS_SSL_CLI_C */
|
|
}
|
|
|
|
#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 /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
|
|
{
|
|
ca_chain = ssl->conf->ca_chain;
|
|
ca_crl = ssl->conf->ca_crl;
|
|
}
|
|
|
|
/*
|
|
* Main check: verify certificate
|
|
*/
|
|
ret = mbedtls_x509_crt_verify_with_profile(
|
|
ssl->session_negotiate->peer_cert,
|
|
ca_chain, ca_crl,
|
|
ssl->conf->cert_profile,
|
|
ssl->hostname,
|
|
&verify_result,
|
|
ssl->conf->f_vrfy, ssl->conf->p_vrfy );
|
|
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
|
|
}
|
|
|
|
/*
|
|
* Secondary checks: always done, but change 'ret' only if it was 0
|
|
*/
|
|
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
|
|
{
|
|
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_key_usage(
|
|
ssl->session_negotiate->peer_cert,
|
|
MBEDTLS_X509_KU_DIGITAL_SIGNATURE ) != 0 ) ||
|
|
( mbedtls_x509_crt_check_extended_key_usage(
|
|
ssl->session_negotiate->peer_cert,
|
|
ext_oid, ext_len ) != 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
|
|
* mbedtls_ssl_tls13_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( ca_chain == NULL && authmode == MBEDTLS_SSL_VERIFY_REQUIRED )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
|
|
ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED;
|
|
}
|
|
|
|
if( ret != 0 )
|
|
{
|
|
/* 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( verify_result & MBEDTLS_X509_BADCERT_OTHER )
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED, ret );
|
|
else if( verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH )
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_BAD_CERT, ret );
|
|
else if( verify_result & ( MBEDTLS_X509_BADCERT_KEY_USAGE |
|
|
MBEDTLS_X509_BADCERT_EXT_KEY_USAGE |
|
|
MBEDTLS_X509_BADCERT_NS_CERT_TYPE |
|
|
MBEDTLS_X509_BADCERT_BAD_PK |
|
|
MBEDTLS_X509_BADCERT_BAD_KEY ) )
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT, ret );
|
|
else if( verify_result & MBEDTLS_X509_BADCERT_EXPIRED )
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED, ret );
|
|
else if( verify_result & MBEDTLS_X509_BADCERT_REVOKED )
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED, ret );
|
|
else if( verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED )
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA, ret );
|
|
else
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN, ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_DEBUG_C)
|
|
if( verify_result != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %08x",
|
|
(unsigned int) verify_result ) );
|
|
}
|
|
else
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) );
|
|
}
|
|
#endif /* MBEDTLS_DEBUG_C */
|
|
|
|
ssl->session_negotiate->verify_result = verify_result;
|
|
return( ret );
|
|
}
|
|
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
static int ssl_tls13_validate_certificate( mbedtls_ssl_context *ssl )
|
|
{
|
|
((void) ssl);
|
|
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
|
|
}
|
|
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
|
|
|
|
int mbedtls_ssl_tls13_process_certificate( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
|
|
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
|
|
unsigned char *buf;
|
|
size_t buf_len;
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_fetch_handshake_msg(
|
|
ssl, MBEDTLS_SSL_HS_CERTIFICATE,
|
|
&buf, &buf_len ) );
|
|
|
|
/* Parse the certificate chain sent by the peer. */
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_parse_certificate( ssl, buf,
|
|
buf + buf_len ) );
|
|
/* Validate the certificate chain and set the verification results. */
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_validate_certificate( ssl ) );
|
|
|
|
mbedtls_ssl_add_hs_msg_to_checksum( ssl, MBEDTLS_SSL_HS_CERTIFICATE,
|
|
buf, buf_len );
|
|
|
|
cleanup:
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
|
|
return( ret );
|
|
}
|
|
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
|
|
/*
|
|
* enum {
|
|
* X509(0),
|
|
* RawPublicKey(2),
|
|
* (255)
|
|
* } CertificateType;
|
|
*
|
|
* struct {
|
|
* select (certificate_type) {
|
|
* case RawPublicKey:
|
|
* // From RFC 7250 ASN.1_subjectPublicKeyInfo
|
|
* opaque ASN1_subjectPublicKeyInfo<1..2^24-1>;
|
|
*
|
|
* case X509:
|
|
* opaque cert_data<1..2^24-1>;
|
|
* };
|
|
* Extension extensions<0..2^16-1>;
|
|
* } CertificateEntry;
|
|
*
|
|
* struct {
|
|
* opaque certificate_request_context<0..2^8-1>;
|
|
* CertificateEntry certificate_list<0..2^24-1>;
|
|
* } Certificate;
|
|
*/
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
static int ssl_tls13_write_certificate_body( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
const mbedtls_x509_crt *crt = mbedtls_ssl_own_cert( ssl );
|
|
unsigned char *p = buf;
|
|
unsigned char *certificate_request_context =
|
|
ssl->handshake->certificate_request_context;
|
|
unsigned char certificate_request_context_len =
|
|
ssl->handshake->certificate_request_context_len;
|
|
unsigned char *p_certificate_list_len;
|
|
|
|
|
|
/* ...
|
|
* opaque certificate_request_context<0..2^8-1>;
|
|
* ...
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, certificate_request_context_len + 1 );
|
|
*p++ = certificate_request_context_len;
|
|
if( certificate_request_context_len > 0 )
|
|
{
|
|
memcpy( p, certificate_request_context, certificate_request_context_len );
|
|
p += certificate_request_context_len;
|
|
}
|
|
|
|
/* ...
|
|
* CertificateEntry certificate_list<0..2^24-1>;
|
|
* ...
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 3 );
|
|
p_certificate_list_len = p;
|
|
p += 3;
|
|
|
|
MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", crt );
|
|
|
|
while( crt != NULL )
|
|
{
|
|
size_t cert_data_len = crt->raw.len;
|
|
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, cert_data_len + 3 + 2 );
|
|
MBEDTLS_PUT_UINT24_BE( cert_data_len, p, 0 );
|
|
p += 3;
|
|
|
|
memcpy( p, crt->raw.p, cert_data_len );
|
|
p += cert_data_len;
|
|
crt = crt->next;
|
|
|
|
/* Currently, we don't have any certificate extensions defined.
|
|
* Hence, we are sending an empty extension with length zero.
|
|
*/
|
|
MBEDTLS_PUT_UINT16_BE( 0, p, 0 );
|
|
p += 2;
|
|
}
|
|
|
|
MBEDTLS_PUT_UINT24_BE( p - p_certificate_list_len - 3,
|
|
p_certificate_list_len, 0 );
|
|
|
|
*out_len = p - buf;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_write_certificate( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
unsigned char *buf;
|
|
size_t buf_len, msg_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl,
|
|
MBEDTLS_SSL_HS_CERTIFICATE, &buf, &buf_len ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_certificate_body( ssl,
|
|
buf,
|
|
buf + buf_len,
|
|
&msg_len ) );
|
|
|
|
mbedtls_ssl_add_hs_msg_to_checksum( ssl, MBEDTLS_SSL_HS_CERTIFICATE,
|
|
buf, msg_len );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg(
|
|
ssl, buf_len, msg_len ) );
|
|
cleanup:
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
* STATE HANDLING: Output Certificate Verify
|
|
*/
|
|
int mbedtls_ssl_tls13_check_sig_alg_cert_key_match( uint16_t sig_alg,
|
|
mbedtls_pk_context *key )
|
|
{
|
|
mbedtls_pk_type_t pk_type = mbedtls_ssl_sig_from_pk( key );
|
|
size_t key_size = mbedtls_pk_get_bitlen( key );
|
|
|
|
switch( pk_type )
|
|
{
|
|
case MBEDTLS_SSL_SIG_ECDSA:
|
|
switch( key_size )
|
|
{
|
|
case 256:
|
|
return(
|
|
sig_alg == MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256 );
|
|
|
|
case 384:
|
|
return(
|
|
sig_alg == MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384 );
|
|
|
|
case 521:
|
|
return(
|
|
sig_alg == MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512 );
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case MBEDTLS_SSL_SIG_RSA:
|
|
switch( sig_alg )
|
|
{
|
|
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256: /* Intentional fallthrough */
|
|
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384: /* Intentional fallthrough */
|
|
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512:
|
|
return( 1 );
|
|
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
static int ssl_tls13_write_certificate_verify_body( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *p = buf;
|
|
mbedtls_pk_context *own_key;
|
|
|
|
unsigned char handshake_hash[ MBEDTLS_TLS1_3_MD_MAX_SIZE ];
|
|
size_t handshake_hash_len;
|
|
unsigned char verify_buffer[ SSL_VERIFY_STRUCT_MAX_SIZE ];
|
|
size_t verify_buffer_len;
|
|
|
|
uint16_t *sig_alg = ssl->handshake->received_sig_algs;
|
|
size_t signature_len = 0;
|
|
|
|
*out_len = 0;
|
|
|
|
own_key = mbedtls_ssl_own_key( ssl );
|
|
if( own_key == NULL )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
ret = mbedtls_ssl_get_handshake_transcript( ssl,
|
|
ssl->handshake->ciphersuite_info->mac,
|
|
handshake_hash,
|
|
sizeof( handshake_hash ),
|
|
&handshake_hash_len );
|
|
if( ret != 0 )
|
|
return( ret );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "handshake hash",
|
|
handshake_hash,
|
|
handshake_hash_len);
|
|
|
|
ssl_tls13_create_verify_structure( handshake_hash, handshake_hash_len,
|
|
verify_buffer, &verify_buffer_len,
|
|
ssl->conf->endpoint );
|
|
|
|
/*
|
|
* struct {
|
|
* SignatureScheme algorithm;
|
|
* opaque signature<0..2^16-1>;
|
|
* } CertificateVerify;
|
|
*/
|
|
/* Check there is space for the algorithm identifier (2 bytes) and the
|
|
* signature length (2 bytes).
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
|
|
|
|
for( ; *sig_alg != MBEDTLS_TLS1_3_SIG_NONE ; sig_alg++ )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
mbedtls_pk_type_t pk_type = MBEDTLS_PK_NONE;
|
|
mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
|
|
psa_algorithm_t psa_algorithm = PSA_ALG_NONE;
|
|
unsigned char verify_hash[PSA_HASH_MAX_SIZE];
|
|
size_t verify_hash_len;
|
|
|
|
if( !mbedtls_ssl_sig_alg_is_offered( ssl, *sig_alg ) )
|
|
continue;
|
|
|
|
if( !mbedtls_ssl_tls13_sig_alg_for_cert_verify_is_supported( *sig_alg ) )
|
|
continue;
|
|
|
|
if( !mbedtls_ssl_tls13_check_sig_alg_cert_key_match( *sig_alg, own_key ) )
|
|
continue;
|
|
|
|
if( mbedtls_ssl_get_pk_type_and_md_alg_from_sig_alg(
|
|
*sig_alg, &pk_type, &md_alg ) != 0 )
|
|
{
|
|
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
|
|
}
|
|
|
|
/* Hash verify buffer with indicated hash function */
|
|
psa_algorithm = mbedtls_hash_info_psa_from_md( md_alg );
|
|
status = psa_hash_compute( psa_algorithm,
|
|
verify_buffer,
|
|
verify_buffer_len,
|
|
verify_hash, sizeof( verify_hash ),
|
|
&verify_hash_len );
|
|
if( status != PSA_SUCCESS )
|
|
return( psa_ssl_status_to_mbedtls( status ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 3, "verify hash", verify_hash, verify_hash_len );
|
|
|
|
if( ( ret = mbedtls_pk_sign_ext( pk_type, own_key,
|
|
md_alg, verify_hash, verify_hash_len,
|
|
p + 4, (size_t)( end - ( p + 4 ) ), &signature_len,
|
|
ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "CertificateVerify signature failed with %s",
|
|
mbedtls_ssl_sig_alg_to_str( *sig_alg ) ) );
|
|
MBEDTLS_SSL_DEBUG_RET( 2, "mbedtls_pk_sign_ext", ret );
|
|
|
|
/* The signature failed. This is possible if the private key
|
|
* was not suitable for the signature operation as purposely we
|
|
* did not check its suitability completely. Let's try with
|
|
* another signature algorithm.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "CertificateVerify signature with %s",
|
|
mbedtls_ssl_sig_alg_to_str( *sig_alg ) ) );
|
|
|
|
break;
|
|
}
|
|
|
|
if( *sig_alg == MBEDTLS_TLS1_3_SIG_NONE )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "no suitable signature algorithm" ) );
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
|
|
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
}
|
|
|
|
MBEDTLS_PUT_UINT16_BE( *sig_alg, p, 0 );
|
|
MBEDTLS_PUT_UINT16_BE( signature_len, p, 2 );
|
|
|
|
*out_len = 4 + signature_len;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_write_certificate_verify( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = 0;
|
|
unsigned char *buf;
|
|
size_t buf_len, msg_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl,
|
|
MBEDTLS_SSL_HS_CERTIFICATE_VERIFY, &buf, &buf_len ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_certificate_verify_body(
|
|
ssl, buf, buf + buf_len, &msg_len ) );
|
|
|
|
mbedtls_ssl_add_hs_msg_to_checksum( ssl, MBEDTLS_SSL_HS_CERTIFICATE_VERIFY,
|
|
buf, msg_len );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg(
|
|
ssl, buf_len, msg_len ) );
|
|
|
|
cleanup:
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) );
|
|
return( ret );
|
|
}
|
|
|
|
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
|
|
|
|
/*
|
|
*
|
|
* STATE HANDLING: Incoming Finished message.
|
|
*/
|
|
/*
|
|
* Implementation
|
|
*/
|
|
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
static int ssl_tls13_preprocess_finished_message( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
ret = mbedtls_ssl_tls13_calculate_verify_data( ssl,
|
|
ssl->handshake->state_local.finished_in.digest,
|
|
sizeof( ssl->handshake->state_local.finished_in.digest ),
|
|
&ssl->handshake->state_local.finished_in.digest_len,
|
|
ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ?
|
|
MBEDTLS_SSL_IS_SERVER : MBEDTLS_SSL_IS_CLIENT );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_calculate_verify_data", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
static int ssl_tls13_parse_finished_message( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
const unsigned char *end )
|
|
{
|
|
/*
|
|
* struct {
|
|
* opaque verify_data[Hash.length];
|
|
* } Finished;
|
|
*/
|
|
const unsigned char *expected_verify_data =
|
|
ssl->handshake->state_local.finished_in.digest;
|
|
size_t expected_verify_data_len =
|
|
ssl->handshake->state_local.finished_in.digest_len;
|
|
/* Structural validation */
|
|
if( (size_t)( end - buf ) != expected_verify_data_len )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
|
|
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
|
|
MBEDTLS_ERR_SSL_DECODE_ERROR );
|
|
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
|
|
}
|
|
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "verify_data (self-computed):",
|
|
expected_verify_data,
|
|
expected_verify_data_len );
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "verify_data (received message):", buf,
|
|
expected_verify_data_len );
|
|
|
|
/* Semantic validation */
|
|
if( mbedtls_ct_memcmp( buf,
|
|
expected_verify_data,
|
|
expected_verify_data_len ) != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
|
|
|
|
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR,
|
|
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
}
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_process_finished_message( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *buf;
|
|
size_t buf_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished message" ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_fetch_handshake_msg( ssl,
|
|
MBEDTLS_SSL_HS_FINISHED,
|
|
&buf, &buf_len ) );
|
|
|
|
/* Preprocessing step: Compute handshake digest */
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_preprocess_finished_message( ssl ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_parse_finished_message( ssl, buf, buf + buf_len ) );
|
|
|
|
mbedtls_ssl_add_hs_msg_to_checksum( ssl, MBEDTLS_SSL_HS_FINISHED,
|
|
buf, buf_len );
|
|
|
|
cleanup:
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished message" ) );
|
|
return( ret );
|
|
}
|
|
|
|
/*
|
|
*
|
|
* STATE HANDLING: Write and send Finished message.
|
|
*
|
|
*/
|
|
/*
|
|
* Implement
|
|
*/
|
|
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
static int ssl_tls13_prepare_finished_message( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret;
|
|
|
|
/* Compute transcript of handshake up to now. */
|
|
ret = mbedtls_ssl_tls13_calculate_verify_data( ssl,
|
|
ssl->handshake->state_local.finished_out.digest,
|
|
sizeof( ssl->handshake->state_local.finished_out.digest ),
|
|
&ssl->handshake->state_local.finished_out.digest_len,
|
|
ssl->conf->endpoint );
|
|
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "calculate_verify_data failed", ret );
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
static int ssl_tls13_write_finished_message_body( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
size_t verify_data_len = ssl->handshake->state_local.finished_out.digest_len;
|
|
/*
|
|
* struct {
|
|
* opaque verify_data[Hash.length];
|
|
* } Finished;
|
|
*/
|
|
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, verify_data_len );
|
|
|
|
memcpy( buf, ssl->handshake->state_local.finished_out.digest,
|
|
verify_data_len );
|
|
|
|
*out_len = verify_data_len;
|
|
return( 0 );
|
|
}
|
|
|
|
/* Main entry point: orchestrates the other functions */
|
|
int mbedtls_ssl_tls13_write_finished_message( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char *buf;
|
|
size_t buf_len, msg_len;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished message" ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_prepare_finished_message( ssl ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_start_handshake_msg( ssl,
|
|
MBEDTLS_SSL_HS_FINISHED, &buf, &buf_len ) );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_finished_message_body(
|
|
ssl, buf, buf + buf_len, &msg_len ) );
|
|
|
|
mbedtls_ssl_add_hs_msg_to_checksum( ssl, MBEDTLS_SSL_HS_FINISHED,
|
|
buf, msg_len );
|
|
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_finish_handshake_msg(
|
|
ssl, buf_len, msg_len ) );
|
|
cleanup:
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished message" ) );
|
|
return( ret );
|
|
}
|
|
|
|
void mbedtls_ssl_tls13_handshake_wrapup( mbedtls_ssl_context *ssl )
|
|
{
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Switch to application keys for inbound traffic" ) );
|
|
mbedtls_ssl_set_inbound_transform ( ssl, ssl->transform_application );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Switch to application keys for outbound traffic" ) );
|
|
mbedtls_ssl_set_outbound_transform( ssl, ssl->transform_application );
|
|
|
|
/*
|
|
* Free the previous session and switch to the current one.
|
|
*/
|
|
if( ssl->session )
|
|
{
|
|
mbedtls_ssl_session_free( ssl->session );
|
|
mbedtls_free( ssl->session );
|
|
}
|
|
ssl->session = ssl->session_negotiate;
|
|
ssl->session_negotiate = NULL;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) );
|
|
}
|
|
|
|
/*
|
|
*
|
|
* STATE HANDLING: Write ChangeCipherSpec
|
|
*
|
|
*/
|
|
#if defined(MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE)
|
|
MBEDTLS_CHECK_RETURN_CRITICAL
|
|
static int ssl_tls13_write_change_cipher_spec_body( mbedtls_ssl_context *ssl,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *olen )
|
|
{
|
|
((void) ssl);
|
|
|
|
MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 1 );
|
|
buf[0] = 1;
|
|
*olen = 1;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_write_change_cipher_spec( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) );
|
|
|
|
/* Write CCS message */
|
|
MBEDTLS_SSL_PROC_CHK( ssl_tls13_write_change_cipher_spec_body(
|
|
ssl, ssl->out_msg,
|
|
ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN,
|
|
&ssl->out_msglen ) );
|
|
|
|
ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC;
|
|
|
|
/* Dispatch message */
|
|
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_write_record( ssl, 0 ) );
|
|
|
|
cleanup:
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
|
|
return( ret );
|
|
}
|
|
|
|
#endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */
|
|
|
|
/* Reset SSL context and update hash for handling HRR.
|
|
*
|
|
* Replace Transcript-Hash(X) by
|
|
* Transcript-Hash( message_hash ||
|
|
* 00 00 Hash.length ||
|
|
* X )
|
|
* A few states of the handshake are preserved, including:
|
|
* - session ID
|
|
* - session ticket
|
|
* - negotiated ciphersuite
|
|
*/
|
|
int mbedtls_ssl_reset_transcript_for_hrr( mbedtls_ssl_context *ssl )
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char hash_transcript[PSA_HASH_MAX_SIZE + 4];
|
|
size_t hash_len;
|
|
const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
|
|
uint16_t cipher_suite = ssl->session_negotiate->ciphersuite;
|
|
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( cipher_suite );
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Reset SSL session for HRR" ) );
|
|
|
|
ret = mbedtls_ssl_get_handshake_transcript( ssl, ciphersuite_info->mac,
|
|
hash_transcript + 4,
|
|
PSA_HASH_MAX_SIZE,
|
|
&hash_len );
|
|
if( ret != 0 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_RET( 4, "mbedtls_ssl_get_handshake_transcript", ret );
|
|
return( ret );
|
|
}
|
|
|
|
hash_transcript[0] = MBEDTLS_SSL_HS_MESSAGE_HASH;
|
|
hash_transcript[1] = 0;
|
|
hash_transcript[2] = 0;
|
|
hash_transcript[3] = (unsigned char) hash_len;
|
|
|
|
hash_len += 4;
|
|
|
|
#if defined(MBEDTLS_HAS_ALG_SHA_256_VIA_MD_OR_PSA_BASED_ON_USE_PSA)
|
|
if( ciphersuite_info->mac == MBEDTLS_MD_SHA256 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "Truncated SHA-256 handshake transcript",
|
|
hash_transcript, hash_len );
|
|
|
|
#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 /* MBEDTLS_HAS_ALG_SHA_256_VIA_MD_OR_PSA_BASED_ON_USE_PSA */
|
|
#if defined(MBEDTLS_HAS_ALG_SHA_384_VIA_MD_OR_PSA_BASED_ON_USE_PSA)
|
|
if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
|
|
{
|
|
MBEDTLS_SSL_DEBUG_BUF( 4, "Truncated SHA-384 handshake transcript",
|
|
hash_transcript, hash_len );
|
|
|
|
#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_sha384, 1 );
|
|
#endif
|
|
}
|
|
#endif /* MBEDTLS_HAS_ALG_SHA_384_VIA_MD_OR_PSA_BASED_ON_USE_PSA */
|
|
#if defined(MBEDTLS_HAS_ALG_SHA_256_VIA_MD_OR_PSA_BASED_ON_USE_PSA) || defined(MBEDTLS_HAS_ALG_SHA_384_VIA_MD_OR_PSA_BASED_ON_USE_PSA)
|
|
ssl->handshake->update_checksum( ssl, hash_transcript, hash_len );
|
|
#endif /* MBEDTLS_HAS_ALG_SHA_256_VIA_MD_OR_PSA_BASED_ON_USE_PSA || MBEDTLS_HAS_ALG_SHA_384_VIA_MD_OR_PSA_BASED_ON_USE_PSA */
|
|
|
|
return( ret );
|
|
}
|
|
|
|
#if defined(MBEDTLS_ECDH_C)
|
|
|
|
int mbedtls_ssl_tls13_read_public_ecdhe_share( mbedtls_ssl_context *ssl,
|
|
const unsigned char *buf,
|
|
size_t buf_len )
|
|
{
|
|
uint8_t *p = (uint8_t*)buf;
|
|
const uint8_t *end = buf + buf_len;
|
|
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
|
|
|
|
/* Get size of the TLS opaque key_exchange field of the KeyShareEntry struct. */
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
|
|
uint16_t peerkey_len = MBEDTLS_GET_UINT16_BE( p, 0 );
|
|
p += 2;
|
|
|
|
/* Check if key size is consistent with given buffer length. */
|
|
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, peerkey_len );
|
|
|
|
/* Store peer's ECDH public key. */
|
|
memcpy( handshake->ecdh_psa_peerkey, p, peerkey_len );
|
|
handshake->ecdh_psa_peerkey_len = peerkey_len;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int mbedtls_ssl_tls13_generate_and_write_ecdh_key_exchange(
|
|
mbedtls_ssl_context *ssl,
|
|
uint16_t named_group,
|
|
unsigned char *buf,
|
|
unsigned char *end,
|
|
size_t *out_len )
|
|
{
|
|
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
|
|
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
|
|
psa_key_attributes_t key_attributes;
|
|
size_t own_pubkey_len;
|
|
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
|
|
size_t ecdh_bits = 0;
|
|
|
|
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Perform PSA-based ECDH computation." ) );
|
|
|
|
/* Convert EC group to PSA key type. */
|
|
if( ( handshake->ecdh_psa_type =
|
|
mbedtls_psa_parse_tls_ecc_group( named_group, &ecdh_bits ) ) == 0 )
|
|
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
|
|
|
|
ssl->handshake->ecdh_bits = ecdh_bits;
|
|
|
|
key_attributes = psa_key_attributes_init();
|
|
psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
|
|
psa_set_key_algorithm( &key_attributes, PSA_ALG_ECDH );
|
|
psa_set_key_type( &key_attributes, handshake->ecdh_psa_type );
|
|
psa_set_key_bits( &key_attributes, handshake->ecdh_bits );
|
|
|
|
/* Generate ECDH private key. */
|
|
status = psa_generate_key( &key_attributes,
|
|
&handshake->ecdh_psa_privkey );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "psa_generate_key", ret );
|
|
return( ret );
|
|
|
|
}
|
|
|
|
/* Export the public part of the ECDH private key from PSA. */
|
|
status = psa_export_public_key( handshake->ecdh_psa_privkey,
|
|
buf, (size_t)( end - buf ),
|
|
&own_pubkey_len );
|
|
if( status != PSA_SUCCESS )
|
|
{
|
|
ret = psa_ssl_status_to_mbedtls( status );
|
|
MBEDTLS_SSL_DEBUG_RET( 1, "psa_export_public_key", ret );
|
|
return( ret );
|
|
|
|
}
|
|
|
|
*out_len = own_pubkey_len;
|
|
|
|
return( 0 );
|
|
}
|
|
#endif /* MBEDTLS_ECDH_C */
|
|
|
|
#endif /* MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_PROTO_TLS1_3 */
|