AuroraMiddleware/mbedtls
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
78b1fa7e81
mbedtls/library/ssl_tls13_generic.c
XiaokangQian 78b1fa7e81 Update code base on comments 
Move reset transcript for hrr to generic
Reset SHA256 or SHA384 other than both
Rename message layer reset
Add check log for hrr parse successfully

Signed-off-by: XiaokangQian <xiaokang.qian@arm.com>
2022-01-26 10:53:15 +00:00

1239 lines
41 KiB
C
Raw Blame History

/*
* TLS 1.3 functionality shared between client and server
*
* 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.
*/
#include "common.h"
#if defined(MBEDTLS_SSL_TLS_C)
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
#include <string.h>
#include "mbedtls/error.h"
#include "mbedtls/debug.h"
#include "mbedtls/oid.h"
#include "mbedtls/platform.h"
#include "mbedtls/constant_time.h"
#include <string.h>
#include "ssl_misc.h"
#include "ssl_tls13_keys.h"
int mbedtls_ssl_tls13_fetch_handshake_msg( mbedtls_ssl_context *ssl,
unsigned hs_type,
unsigned char **buf,
size_t *buf_len )
{
int ret;
if( ( ret = mbedtls_ssl_read_record( ssl, 0 ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
goto cleanup;
}
if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ||
ssl->in_msg[0] != hs_type )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Receive unexpected handshake message." ) );
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE,
MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
ret = MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE;
goto cleanup;
}
/*
* Jump handshake header (4 bytes, see Section 4 of RFC 8446).
* ...
* HandshakeType msg_type;
* uint24 length;
* ...
*/
*buf = ssl->in_msg + 4;
*buf_len = ssl->in_hslen - 4;
cleanup:
return( ret );
}
int mbedtls_ssl_tls13_start_handshake_msg( mbedtls_ssl_context *ssl,
unsigned hs_type,
unsigned char **buf,
size_t *buf_len )
{
/*
* Reserve 4 bytes for hanshake header. ( Section 4,RFC 8446 )
* ...
* HandshakeType msg_type;
* uint24 length;
* ...
*/
*buf = ssl->out_msg + 4;
*buf_len = MBEDTLS_SSL_OUT_CONTENT_LEN - 4;
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = hs_type;
return( 0 );
}
int mbedtls_ssl_tls13_finish_handshake_msg( mbedtls_ssl_context *ssl,
size_t buf_len,
size_t msg_len )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t msg_with_header_len;
((void) buf_len);
/* Add reserved 4 bytes for handshake header */
msg_with_header_len = msg_len + 4;
ssl->out_msglen = msg_with_header_len;
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_write_handshake_msg_ext( ssl, 0 ) );
cleanup:
return( ret );
}
void mbedtls_ssl_tls13_add_hs_msg_to_checksum( mbedtls_ssl_context *ssl,
unsigned hs_type,
unsigned char const *msg,
size_t msg_len )
{
mbedtls_ssl_tls13_add_hs_hdr_to_checksum( ssl, hs_type, msg_len );
ssl->handshake->update_checksum( ssl, msg, msg_len );
}
void mbedtls_ssl_tls13_add_hs_hdr_to_checksum( mbedtls_ssl_context *ssl,
unsigned hs_type,
size_t total_hs_len )
{
unsigned char hs_hdr[4];
/* Build HS header for checksum update. */
hs_hdr[0] = MBEDTLS_BYTE_0( hs_type );
hs_hdr[1] = MBEDTLS_BYTE_2( total_hs_len );
hs_hdr[2] = MBEDTLS_BYTE_1( total_hs_len );
hs_hdr[3] = MBEDTLS_BYTE_0( total_hs_len );
ssl->handshake->update_checksum( ssl, hs_hdr, sizeof( hs_hdr ) );
}
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
/*
* STATE HANDLING: Read CertificateVerify
*/
/* Macro to express the maximum length of the verify structure.
*
* The structure is computed per TLS 1.3 specification as:
* - 64 bytes of octet 32,
* - 33 bytes for the context string
* (which is either "TLS 1.3, client CertificateVerify"
* or "TLS 1.3, server CertificateVerify"),
* - 1 byte for the octet 0x0, which serves as a separator,
* - 32 or 48 bytes for the Transcript-Hash(Handshake Context, Certificate)
* (depending on the size of the transcript_hash)
*
* This results in a total size of
* - 130 bytes for a SHA256-based transcript hash, or
* (64 + 33 + 1 + 32 bytes)
* - 146 bytes for a SHA384-based transcript hash.
* (64 + 33 + 1 + 48 bytes)
*
*/
#define SSL_VERIFY_STRUCT_MAX_SIZE ( 64 + \
33 + \
1 + \
MBEDTLS_TLS1_3_MD_MAX_SIZE \
)
/*
* The ssl_tls13_create_verify_structure() creates the verify structure.
* As input, it requires the transcript hash.
*
* The caller has to ensure that the buffer has size at least
* SSL_VERIFY_STRUCT_MAX_SIZE bytes.
*/
static void ssl_tls13_create_verify_structure( const unsigned char *transcript_hash,
size_t transcript_hash_len,
unsigned char *verify_buffer,
size_t *verify_buffer_len,
int from )
{
size_t idx;
/* RFC 8446, Section 4.4.3:
*
* The digital signature [in the CertificateVerify message] is then
* computed over the concatenation of:
* - A string that consists of octet 32 (0x20) repeated 64 times
* - The context string
* - A single 0 byte which serves as the separator
* - The content to be signed
*/
memset( verify_buffer, 0x20, 64 );
idx = 64;
if( from == MBEDTLS_SSL_IS_CLIENT )
{
memcpy( verify_buffer + idx, MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( client_cv ) );
idx += MBEDTLS_SSL_TLS1_3_LBL_LEN( client_cv );
}
else
{ /* from == MBEDTLS_SSL_IS_SERVER */
memcpy( verify_buffer + idx, MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( server_cv ) );
idx += MBEDTLS_SSL_TLS1_3_LBL_LEN( server_cv );
}
verify_buffer[idx++] = 0x0;
memcpy( verify_buffer + idx, transcript_hash, transcript_hash_len );
idx += transcript_hash_len;
*verify_buffer_len = idx;
}
static int ssl_tls13_parse_certificate_verify( mbedtls_ssl_context *ssl,
const unsigned char *buf,
const unsigned char *end,
const unsigned char *verify_buffer,
size_t verify_buffer_len )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const unsigned char *p = buf;
uint16_t algorithm;
size_t signature_len;
mbedtls_pk_type_t sig_alg;
mbedtls_md_type_t md_alg;
unsigned char verify_hash[MBEDTLS_MD_MAX_SIZE];
size_t verify_hash_len;
void const *options = NULL;
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
mbedtls_pk_rsassa_pss_options rsassa_pss_options;
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
/*
* struct {
* SignatureScheme algorithm;
* opaque signature<0..2^16-1>;
* } CertificateVerify;
*/
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
algorithm = MBEDTLS_GET_UINT16_BE( p, 0 );
p += 2;
/* RFC 8446 section 4.4.3
*
* If the CertificateVerify message is sent by a server, the signature algorithm
* MUST be one offered in the client's "signature_algorithms" extension unless
* no valid certificate chain can be produced without unsupported algorithms
*
* RFC 8446 section 4.4.2.2
*
* If the client cannot construct an acceptable chain using the provided
* certificates and decides to abort the handshake, then it MUST abort the handshake
* with an appropriate certificate-related alert (by default, "unsupported_certificate").
*
* Check if algorithm is an offered signature algorithm.
*/
if( ! mbedtls_ssl_sig_alg_is_offered( ssl, algorithm ) )
{
/* algorithm not in offered signature algorithms list */
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Received signature algorithm(%04x) is not "
"offered.",
( unsigned int ) algorithm ) );
goto error;
}
/* We currently only support ECDSA-based signatures */
switch( algorithm )
{
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256:
md_alg = MBEDTLS_MD_SHA256;
sig_alg = MBEDTLS_PK_ECDSA;
break;
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384:
md_alg = MBEDTLS_MD_SHA384;
sig_alg = MBEDTLS_PK_ECDSA;
break;
case MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512:
md_alg = MBEDTLS_MD_SHA512;
sig_alg = MBEDTLS_PK_ECDSA;
break;
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256:
MBEDTLS_SSL_DEBUG_MSG( 4, ( "Certificate Verify: using RSA PSS" ) );
md_alg = MBEDTLS_MD_SHA256;
sig_alg = MBEDTLS_PK_RSASSA_PSS;
break;
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
default:
MBEDTLS_SSL_DEBUG_MSG( 1, ( "Certificate Verify: Unknown signature algorithm." ) );
goto error;
}
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate Verify: Signature algorithm ( %04x )",
( unsigned int ) algorithm ) );
/*
* Check the certificate's key type matches the signature alg
*/
if( !mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, sig_alg ) )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "signature algorithm doesn't match cert key" ) );
goto error;
}
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
signature_len = MBEDTLS_GET_UINT16_BE( p, 0 );
p += 2;
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, signature_len );
/* Hash verify buffer with indicated hash function */
switch( md_alg )
{
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_MD_SHA256:
verify_hash_len = 32;
ret = mbedtls_sha256( verify_buffer, verify_buffer_len, verify_hash, 0 );
break;
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA384_C)
case MBEDTLS_MD_SHA384:
verify_hash_len = 48;
ret = mbedtls_sha512( verify_buffer, verify_buffer_len, verify_hash, 1 );
break;
#endif /* MBEDTLS_SHA384_C */
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_MD_SHA512:
verify_hash_len = 64;
ret = mbedtls_sha512( verify_buffer, verify_buffer_len, verify_hash, 0 );
break;
#endif /* MBEDTLS_SHA512_C */
default:
ret = MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE;
break;
}
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "hash computation error", ret );
goto error;
}
MBEDTLS_SSL_DEBUG_BUF( 3, "verify hash", verify_hash, verify_hash_len );
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
if( sig_alg == MBEDTLS_PK_RSASSA_PSS )
{
const mbedtls_md_info_t* md_info;
rsassa_pss_options.mgf1_hash_id = md_alg;
if( ( md_info = mbedtls_md_info_from_type( md_alg ) ) == NULL )
{
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
}
rsassa_pss_options.expected_salt_len = mbedtls_md_get_size( md_info );
options = (const void*) &rsassa_pss_options;
}
#endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
if( ( ret = mbedtls_pk_verify_ext( sig_alg, options,
&ssl->session_negotiate->peer_cert->pk,
md_alg, verify_hash, verify_hash_len,
p, signature_len ) ) == 0 )
{
return( 0 );
}
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify_ext", ret );
error:
/* RFC 8446 section 4.4.3
*
* If the verification fails, the receiver MUST terminate the handshake
* with a "decrypt_error" alert.
*/
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR,
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
}
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
int mbedtls_ssl_tls13_process_certificate_verify( mbedtls_ssl_context *ssl )
{
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char verify_buffer[SSL_VERIFY_STRUCT_MAX_SIZE];
size_t verify_buffer_len;
unsigned char transcript[MBEDTLS_TLS1_3_MD_MAX_SIZE];
size_t transcript_len;
unsigned char *buf;
size_t buf_len;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
MBEDTLS_SSL_PROC_CHK(
mbedtls_ssl_tls13_fetch_handshake_msg( ssl,
MBEDTLS_SSL_HS_CERTIFICATE_VERIFY, &buf, &buf_len ) );
/* Need to calculate the hash of the transcript first
* before reading the message since otherwise it gets
* included in the transcript
*/
ret = mbedtls_ssl_get_handshake_transcript( ssl,
ssl->handshake->ciphersuite_info->mac,
transcript, sizeof( transcript ),
&transcript_len );
if( ret != 0 )
{
MBEDTLS_SSL_PEND_FATAL_ALERT(
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR,
MBEDTLS_ERR_SSL_INTERNAL_ERROR );
return( ret );
}
MBEDTLS_SSL_DEBUG_BUF( 3, "handshake hash", transcript, transcript_len );
/* Create verify structure */
ssl_tls13_create_verify_structure( transcript,
transcript_len,
verify_buffer,
&verify_buffer_len,
( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) ?
MBEDTLS_SSL_IS_SERVER :
MBEDTLS_SSL_IS_CLIENT );
/* Process the message contents */
MBEDTLS_SSL_PROC_CHK( ssl_tls13_parse_certificate_verify( ssl, buf,
buf + buf_len, verify_buffer, verify_buffer_len ) );
mbedtls_ssl_tls13_add_hs_msg_to_checksum( ssl,
MBEDTLS_SSL_HS_CERTIFICATE_VERIFY, buf, buf_len );
cleanup:
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_process_certificate_verify", ret );
return( ret );
#else
((void) ssl);
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
}
/*
*
* STATE HANDLING: Incoming Certificate, client-side only currently.
*
*/
/*
* Implementation
*/
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/*
* Structure of Certificate message:
*
* 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;
*
*/
/* Parse certificate chain send by the server. */
static int 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( ( 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 );
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;
}
/* 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
static int 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. */
static int ssl_tls13_validate_certificate( mbedtls_ssl_context *ssl )
{
int ret = 0;
mbedtls_x509_crt *ca_chain;
mbedtls_x509_crl *ca_crl;
uint32_t verify_result = 0;
#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 defined(MBEDTLS_ECP_C)
{
const mbedtls_pk_context *pk = &ssl->session_negotiate->peer_cert->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 )
{
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( ssl->session_negotiate->peer_cert,
ssl->handshake->ciphersuite_info,
!ssl->conf->endpoint,
&verify_result ) != 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate ( usage extensions )" ) );
if( ret == 0 )
ret = MBEDTLS_ERR_SSL_BAD_CERTIFICATE;
}
if( ca_chain == NULL )
{
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 */
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( 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_tls13_add_hs_msg_to_checksum( ssl, MBEDTLS_SSL_HS_CERTIFICATE,
buf, buf_len );
cleanup:
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
#else
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
return( ret );
}
/*
*
* STATE HANDLING: Incoming Finished message.
*/
/*
* Implementation
*/
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 );
}
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 );
}
#if defined(MBEDTLS_SSL_CLI_C)
static int ssl_tls13_postprocess_server_finished_message( mbedtls_ssl_context *ssl )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ssl_key_set traffic_keys;
mbedtls_ssl_transform *transform_application = NULL;
ret = mbedtls_ssl_tls13_key_schedule_stage_application( ssl );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1,
"mbedtls_ssl_tls13_key_schedule_stage_application", ret );
goto cleanup;
}
ret = mbedtls_ssl_tls13_generate_application_keys( ssl, &traffic_keys );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1,
"mbedtls_ssl_tls13_generate_application_keys", ret );
goto cleanup;
}
transform_application =
mbedtls_calloc( 1, sizeof( mbedtls_ssl_transform ) );
if( transform_application == NULL )
{
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto cleanup;
}
ret = mbedtls_ssl_tls13_populate_transform(
transform_application,
ssl->conf->endpoint,
ssl->session_negotiate->ciphersuite,
&traffic_keys,
ssl );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_tls13_populate_transform", ret );
goto cleanup;
}
ssl->transform_application = transform_application;
cleanup:
mbedtls_platform_zeroize( &traffic_keys, sizeof( traffic_keys ) );
if( ret != 0 )
{
mbedtls_free( transform_application );
MBEDTLS_SSL_PEND_FATAL_ALERT(
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
}
return( ret );
}
#endif /* MBEDTLS_SSL_CLI_C */
static int ssl_tls13_postprocess_finished_message( mbedtls_ssl_context *ssl )
{
#if defined(MBEDTLS_SSL_CLI_C)
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
{
return( ssl_tls13_postprocess_server_finished_message( ssl ) );
}
#else
((void) ssl);
#endif /* MBEDTLS_SSL_CLI_C */
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
}
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" ) );
/* Preprocessing step: Compute handshake digest */
MBEDTLS_SSL_PROC_CHK( ssl_tls13_preprocess_finished_message( ssl ) );
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_fetch_handshake_msg( ssl,
MBEDTLS_SSL_HS_FINISHED,
&buf, &buf_len ) );
MBEDTLS_SSL_PROC_CHK( ssl_tls13_parse_finished_message( ssl, buf, buf + buf_len ) );
mbedtls_ssl_tls13_add_hs_msg_to_checksum(
ssl, MBEDTLS_SSL_HS_FINISHED, buf, buf_len );
MBEDTLS_SSL_PROC_CHK( ssl_tls13_postprocess_finished_message( ssl ) );
cleanup:
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished message" ) );
return( ret );
}
/*
*
* STATE HANDLING: Write and send Finished message.
*
*/
/*
* Implement
*/
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 );
}
static int ssl_tls13_finalize_finished_message( mbedtls_ssl_context *ssl )
{
// TODO: Add back resumption keys calculation after MVP.
((void) ssl);
return( 0 );
}
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_tls13_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_tls13_add_hs_msg_to_checksum( ssl, MBEDTLS_SSL_HS_FINISHED,
buf, msg_len );
MBEDTLS_SSL_PROC_CHK( ssl_tls13_finalize_finished_message( ssl ) );
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_tls13_finish_handshake_msg( ssl,
buf_len, msg_len ) );
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_flush_output( ssl ) );
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" ) );
/*
* 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)
static int ssl_write_change_cipher_spec_postprocess( mbedtls_ssl_context* ssl )
{
#if defined(MBEDTLS_SSL_CLI_C)
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
{
switch( ssl->state )
{
case MBEDTLS_SSL_CLIENT_CCS_BEFORE_2ND_CLIENT_HELLO:
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_HELLO );
break;
case MBEDTLS_SSL_CLIENT_CCS_AFTER_SERVER_FINISHED:
mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_CLIENT_FINISHED );
break;
default:
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
}
}
#else
((void) ssl);
#endif /* MBEDTLS_SSL_CLI_C */
return( 0 );
}
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" ) );
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_flush_output( ssl ) );
/* 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;
/* Update state */
MBEDTLS_SSL_PROC_CHK( ssl_write_change_cipher_spec_postprocess( ssl ) );
/* Dispatch message */
MBEDTLS_SSL_PROC_CHK( mbedtls_ssl_write_record( ssl, 1 ) );
cleanup:
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
return( ret );
}
#endif /* MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE */
static int ssl_hash_transcript_core( mbedtls_ssl_context *ssl,
mbedtls_md_type_t md,
unsigned char *transcript,
size_t len,
size_t *olen )
{
int ret;
size_t hash_size;
if( len < 4 )
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
ret = mbedtls_ssl_get_handshake_transcript( ssl, md,
transcript + 4,
len - 4,
&hash_size );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 4, "mbedtls_ssl_get_handshake_transcript", ret );
return( ret );
}
transcript[0] = MBEDTLS_SSL_HS_MESSAGE_HASH;
transcript[1] = 0;
transcript[2] = 0;
transcript[3] = (unsigned char) hash_size;
*olen = 4 + hash_size;
return( 0 );
}
/* 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[ MBEDTLS_MD_MAX_SIZE + 4 ];
size_t hash_olen;
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" ) );
if( ciphersuite_info->mac == MBEDTLS_MD_SHA256 )
{
#if defined(MBEDTLS_SHA256_C)
ret = ssl_hash_transcript_core( ssl, MBEDTLS_MD_SHA256,
hash_transcript,
sizeof( hash_transcript ),
&hash_olen );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 4, "ssl_hash_transcript_core", ret );
return( ret );
}
MBEDTLS_SSL_DEBUG_BUF( 4, "Truncated SHA-256 handshake transcript",
hash_transcript, hash_olen );
#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
ssl->handshake->update_checksum( ssl, hash_transcript, hash_olen );
#endif /* MBEDTLS_SHA256_C */
}
else if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
{
#if defined(MBEDTLS_SHA384_C)
ret = ssl_hash_transcript_core( ssl, MBEDTLS_MD_SHA384,
hash_transcript,
sizeof( hash_transcript ),
&hash_olen );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 4, "ssl_hash_transcript_core", ret );
return( ret );
}
MBEDTLS_SSL_DEBUG_BUF( 4, "Truncated SHA-384 handshake transcript",
hash_transcript, hash_olen );
#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
ssl->handshake->update_checksum( ssl, hash_transcript, hash_olen );
#endif /* MBEDTLS_SHA384_C */
}
return( ret );
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
#endif /* MBEDTLS_SSL_TLS_C */
Reference in New Issue View Git Blame Copy Permalink