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pigweed / third_party / github / ARMmbed / mbedtls / c2a938711085813eae11d99550b280c416a8242e / . / library / ssl_tls.c
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/*
* TLS shared functions
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* http://www.ietf.org/rfc/rfc2246.txt
* http://www.ietf.org/rfc/rfc4346.txt
*/
#include "common.h"
#if defined(MBEDTLS_SSL_TLS_C)
#include <assert.h>
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#include <stdio.h>
#define mbedtls_calloc calloc
#define mbedtls_free free
#define mbedtls_printf printf
#endif /* !MBEDTLS_PLATFORM_C */
#include "mbedtls/ssl.h"
#include "ssl_client.h"
#include "ssl_debug_helpers.h"
#include "ssl_misc.h"
#include "mbedtls/debug.h"
#include "mbedtls/error.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/version.h"
#include "mbedtls/constant_time.h"
#include <string.h>
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "mbedtls/psa_util.h"
#include "psa/crypto.h"
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#include "mbedtls/oid.h"
#endif
#if defined(MBEDTLS_TEST_HOOKS)
static mbedtls_ssl_chk_buf_ptr_args chk_buf_ptr_fail_args;
void mbedtls_ssl_set_chk_buf_ptr_fail_args(
const uint8_t *cur, const uint8_t *end, size_t need )
{
chk_buf_ptr_fail_args.cur = cur;
chk_buf_ptr_fail_args.end = end;
chk_buf_ptr_fail_args.need = need;
}
void mbedtls_ssl_reset_chk_buf_ptr_fail_args( void )
{
memset( &chk_buf_ptr_fail_args, 0, sizeof( chk_buf_ptr_fail_args ) );
}
int mbedtls_ssl_cmp_chk_buf_ptr_fail_args( mbedtls_ssl_chk_buf_ptr_args *args )
{
return( ( chk_buf_ptr_fail_args.cur != args->cur ) ||
( chk_buf_ptr_fail_args.end != args->end ) ||
( chk_buf_ptr_fail_args.need != args->need ) );
}
#endif /* MBEDTLS_TEST_HOOKS */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
/* Top-level Connection ID API */
int mbedtls_ssl_conf_cid( mbedtls_ssl_config *conf,
size_t len,
int ignore_other_cid )
{
if( len > MBEDTLS_SSL_CID_IN_LEN_MAX )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_FAIL &&
ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_IGNORE )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
conf->ignore_unexpected_cid = ignore_other_cid;
conf->cid_len = len;
return( 0 );
}
int mbedtls_ssl_set_cid( mbedtls_ssl_context *ssl,
int enable,
unsigned char const *own_cid,
size_t own_cid_len )
{
if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
ssl->negotiate_cid = enable;
if( enable == MBEDTLS_SSL_CID_DISABLED )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Disable use of CID extension." ) );
return( 0 );
}
MBEDTLS_SSL_DEBUG_MSG( 3, ( "Enable use of CID extension." ) );
MBEDTLS_SSL_DEBUG_BUF( 3, "Own CID", own_cid, own_cid_len );
if( own_cid_len != ssl->conf->cid_len )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "CID length %u does not match CID length %u in config",
(unsigned) own_cid_len,
(unsigned) ssl->conf->cid_len ) );
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
memcpy( ssl->own_cid, own_cid, own_cid_len );
/* Truncation is not an issue here because
* MBEDTLS_SSL_CID_IN_LEN_MAX at most 255. */
ssl->own_cid_len = (uint8_t) own_cid_len;
return( 0 );
}
int mbedtls_ssl_get_own_cid( mbedtls_ssl_context *ssl,
int *enabled,
unsigned char own_cid[MBEDTLS_SSL_CID_OUT_LEN_MAX],
size_t *own_cid_len )
{
*enabled = MBEDTLS_SSL_CID_DISABLED;
if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
/* We report MBEDTLS_SSL_CID_DISABLED in case the CID length is
* zero as this is indistinguishable from not requesting to use
* the CID extension. */
if( ssl->own_cid_len == 0 || ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED )
return( 0 );
if( own_cid_len != NULL )
{
*own_cid_len = ssl->own_cid_len;
if( own_cid != NULL )
memcpy( own_cid, ssl->own_cid, ssl->own_cid_len );
}
*enabled = MBEDTLS_SSL_CID_ENABLED;
return( 0 );
}
int mbedtls_ssl_get_peer_cid( mbedtls_ssl_context *ssl,
int *enabled,
unsigned char peer_cid[ MBEDTLS_SSL_CID_OUT_LEN_MAX ],
size_t *peer_cid_len )
{
*enabled = MBEDTLS_SSL_CID_DISABLED;
if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ||
mbedtls_ssl_is_handshake_over( ssl ) == 0 )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
/* We report MBEDTLS_SSL_CID_DISABLED in case the CID extensions
* were used, but client and server requested the empty CID.
* This is indistinguishable from not using the CID extension
* in the first place. */
if( ssl->transform_in->in_cid_len == 0 &&
ssl->transform_in->out_cid_len == 0 )
{
return( 0 );
}
if( peer_cid_len != NULL )
{
*peer_cid_len = ssl->transform_in->out_cid_len;
if( peer_cid != NULL )
{
memcpy( peer_cid, ssl->transform_in->out_cid,
ssl->transform_in->out_cid_len );
}
}
*enabled = MBEDTLS_SSL_CID_ENABLED;
return( 0 );
}
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
#endif /* MBEDTLS_SSL_PROTO_DTLS */
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
/*
* Convert max_fragment_length codes to length.
* RFC 6066 says:
* enum{
* 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
* } MaxFragmentLength;
* and we add 0 -> extension unused
*/
static unsigned int ssl_mfl_code_to_length( int mfl )
{
switch( mfl )
{
case MBEDTLS_SSL_MAX_FRAG_LEN_NONE:
return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN );
case MBEDTLS_SSL_MAX_FRAG_LEN_512:
return 512;
case MBEDTLS_SSL_MAX_FRAG_LEN_1024:
return 1024;
case MBEDTLS_SSL_MAX_FRAG_LEN_2048:
return 2048;
case MBEDTLS_SSL_MAX_FRAG_LEN_4096:
return 4096;
default:
return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN );
}
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
int mbedtls_ssl_session_copy( mbedtls_ssl_session *dst,
const mbedtls_ssl_session *src )
{
mbedtls_ssl_session_free( dst );
memcpy( dst, src, sizeof( mbedtls_ssl_session ) );
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
dst->ticket = NULL;
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
if( src->peer_cert != NULL )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) );
if( dst->peer_cert == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
mbedtls_x509_crt_init( dst->peer_cert );
if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p,
src->peer_cert->raw.len ) ) != 0 )
{
mbedtls_free( dst->peer_cert );
dst->peer_cert = NULL;
return( ret );
}
}
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
if( src->peer_cert_digest != NULL )
{
dst->peer_cert_digest =
mbedtls_calloc( 1, src->peer_cert_digest_len );
if( dst->peer_cert_digest == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
memcpy( dst->peer_cert_digest, src->peer_cert_digest,
src->peer_cert_digest_len );
dst->peer_cert_digest_type = src->peer_cert_digest_type;
dst->peer_cert_digest_len = src->peer_cert_digest_len;
}
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
if( src->ticket != NULL )
{
dst->ticket = mbedtls_calloc( 1, src->ticket_len );
if( dst->ticket == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
memcpy( dst->ticket, src->ticket, src->ticket_len );
}
#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
return( 0 );
}
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
MBEDTLS_CHECK_RETURN_CRITICAL
static int resize_buffer( unsigned char **buffer, size_t len_new, size_t *len_old )
{
unsigned char* resized_buffer = mbedtls_calloc( 1, len_new );
if( resized_buffer == NULL )
return -1;
/* We want to copy len_new bytes when downsizing the buffer, and
* len_old bytes when upsizing, so we choose the smaller of two sizes,
* to fit one buffer into another. Size checks, ensuring that no data is
* lost, are done outside of this function. */
memcpy( resized_buffer, *buffer,
( len_new < *len_old ) ? len_new : *len_old );
mbedtls_platform_zeroize( *buffer, *len_old );
mbedtls_free( *buffer );
*buffer = resized_buffer;
*len_old = len_new;
return 0;
}
static void handle_buffer_resizing( mbedtls_ssl_context *ssl, int downsizing,
size_t in_buf_new_len,
size_t out_buf_new_len )
{
int modified = 0;
size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0;
size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0;
if( ssl->in_buf != NULL )
{
written_in = ssl->in_msg - ssl->in_buf;
iv_offset_in = ssl->in_iv - ssl->in_buf;
len_offset_in = ssl->in_len - ssl->in_buf;
if( downsizing ?
ssl->in_buf_len > in_buf_new_len && ssl->in_left < in_buf_new_len :
ssl->in_buf_len < in_buf_new_len )
{
if( resize_buffer( &ssl->in_buf, in_buf_new_len, &ssl->in_buf_len ) != 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "input buffer resizing failed - out of memory" ) );
}
else
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating in_buf to %" MBEDTLS_PRINTF_SIZET,
in_buf_new_len ) );
modified = 1;
}
}
}
if( ssl->out_buf != NULL )
{
written_out = ssl->out_msg - ssl->out_buf;
iv_offset_out = ssl->out_iv - ssl->out_buf;
len_offset_out = ssl->out_len - ssl->out_buf;
if( downsizing ?
ssl->out_buf_len > out_buf_new_len && ssl->out_left < out_buf_new_len :
ssl->out_buf_len < out_buf_new_len )
{
if( resize_buffer( &ssl->out_buf, out_buf_new_len, &ssl->out_buf_len ) != 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "output buffer resizing failed - out of memory" ) );
}
else
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "Reallocating out_buf to %" MBEDTLS_PRINTF_SIZET,
out_buf_new_len ) );
modified = 1;
}
}
}
if( modified )
{
/* Update pointers here to avoid doing it twice. */
mbedtls_ssl_reset_in_out_pointers( ssl );
/* Fields below might not be properly updated with record
* splitting or with CID, so they are manually updated here. */
ssl->out_msg = ssl->out_buf + written_out;
ssl->out_len = ssl->out_buf + len_offset_out;
ssl->out_iv = ssl->out_buf + iv_offset_out;
ssl->in_msg = ssl->in_buf + written_in;
ssl->in_len = ssl->in_buf + len_offset_in;
ssl->in_iv = ssl->in_buf + iv_offset_in;
}
}
#endif /* MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
typedef int (*tls_prf_fn)( const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen );
static tls_prf_fn ssl_tls12prf_from_cs( int ciphersuite_id );
#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */
/* Type for the TLS PRF */
typedef int ssl_tls_prf_t(const unsigned char *, size_t, const char *,
const unsigned char *, size_t,
unsigned char *, size_t);
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_tls12_populate_transform( mbedtls_ssl_transform *transform,
int ciphersuite,
const unsigned char master[48],
#if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM)
int encrypt_then_mac,
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */
ssl_tls_prf_t tls_prf,
const unsigned char randbytes[64],
mbedtls_ssl_protocol_version tls_version,
unsigned endpoint,
const mbedtls_ssl_context *ssl );
#if defined(MBEDTLS_SHA256_C)
MBEDTLS_CHECK_RETURN_CRITICAL
static int tls_prf_sha256( const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen );
static void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *,unsigned char*, size_t * );
static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int );
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA384_C)
MBEDTLS_CHECK_RETURN_CRITICAL
static int tls_prf_sha384( const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen );
static void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *, unsigned char*, size_t * );
static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int );
#endif /* MBEDTLS_SHA384_C */
static size_t ssl_session_save_tls12( const mbedtls_ssl_session *session,
unsigned char *buf,
size_t buf_len );
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_session_load_tls12( mbedtls_ssl_session *session,
const unsigned char *buf,
size_t len );
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t );
#if defined(MBEDTLS_SHA256_C)
static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t );
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA384_C)
static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t );
#endif /* MBEDTLS_SHA384_C */
int mbedtls_ssl_tls_prf( const mbedtls_tls_prf_types prf,
const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen )
{
mbedtls_ssl_tls_prf_cb *tls_prf = NULL;
switch( prf )
{
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA384_C)
case MBEDTLS_SSL_TLS_PRF_SHA384:
tls_prf = tls_prf_sha384;
break;
#endif /* MBEDTLS_SHA384_C */
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_SSL_TLS_PRF_SHA256:
tls_prf = tls_prf_sha256;
break;
#endif /* MBEDTLS_SHA256_C */
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
default:
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
return( tls_prf( secret, slen, label, random, rlen, dstbuf, dlen ) );
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
static void ssl_clear_peer_cert( mbedtls_ssl_session *session )
{
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
if( session->peer_cert != NULL )
{
mbedtls_x509_crt_free( session->peer_cert );
mbedtls_free( session->peer_cert );
session->peer_cert = NULL;
}
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
if( session->peer_cert_digest != NULL )
{
/* Zeroization is not necessary. */
mbedtls_free( session->peer_cert_digest );
session->peer_cert_digest = NULL;
session->peer_cert_digest_type = MBEDTLS_MD_NONE;
session->peer_cert_digest_len = 0;
}
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl,
const mbedtls_ssl_ciphersuite_t *ciphersuite_info )
{
((void) ciphersuite_info);
#if defined(MBEDTLS_SHA384_C)
if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
ssl->handshake->update_checksum = ssl_update_checksum_sha384;
else
#endif
#if defined(MBEDTLS_SHA256_C)
if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 )
ssl->handshake->update_checksum = ssl_update_checksum_sha256;
else
#endif
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
return;
}
}
static void mbedtls_ssl_add_hs_hdr_to_checksum( mbedtls_ssl_context *ssl,
unsigned hs_type,
size_t total_hs_len )
{
unsigned char hs_hdr[4];
/* Build HS header for checksum update. */
hs_hdr[0] = MBEDTLS_BYTE_0( hs_type );
hs_hdr[1] = MBEDTLS_BYTE_2( total_hs_len );
hs_hdr[2] = MBEDTLS_BYTE_1( total_hs_len );
hs_hdr[3] = MBEDTLS_BYTE_0( total_hs_len );
ssl->handshake->update_checksum( ssl, hs_hdr, sizeof( hs_hdr ) );
}
void mbedtls_ssl_add_hs_msg_to_checksum( mbedtls_ssl_context *ssl,
unsigned hs_type,
unsigned char const *msg,
size_t msg_len )
{
mbedtls_ssl_add_hs_hdr_to_checksum( ssl, hs_type, msg_len );
ssl->handshake->update_checksum( ssl, msg, msg_len );
}
void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl )
{
((void) ssl);
#if defined(MBEDTLS_SHA256_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_abort( &ssl->handshake->fin_sha256_psa );
psa_hash_setup( &ssl->handshake->fin_sha256_psa, PSA_ALG_SHA_256 );
#else
mbedtls_sha256_starts( &ssl->handshake->fin_sha256, 0 );
#endif
#endif
#if defined(MBEDTLS_SHA384_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_abort( &ssl->handshake->fin_sha384_psa );
psa_hash_setup( &ssl->handshake->fin_sha384_psa, PSA_ALG_SHA_384 );
#else
mbedtls_sha512_starts( &ssl->handshake->fin_sha512, 1 );
#endif
#endif
}
static void ssl_update_checksum_start( mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len )
{
#if defined(MBEDTLS_SHA256_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len );
#else
mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
#endif
#endif
#if defined(MBEDTLS_SHA384_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len );
#else
mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
#endif
#endif
}
#if defined(MBEDTLS_SHA256_C)
static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len )
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len );
#else
mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
#endif
}
#endif
#if defined(MBEDTLS_SHA384_C)
static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len )
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len );
#else
mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
#endif
}
#endif
static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
{
memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) );
#if defined(MBEDTLS_SHA256_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
handshake->fin_sha256_psa = psa_hash_operation_init();
psa_hash_setup( &handshake->fin_sha256_psa, PSA_ALG_SHA_256 );
#else
mbedtls_sha256_init( &handshake->fin_sha256 );
mbedtls_sha256_starts( &handshake->fin_sha256, 0 );
#endif
#endif
#if defined(MBEDTLS_SHA384_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
handshake->fin_sha384_psa = psa_hash_operation_init();
psa_hash_setup( &handshake->fin_sha384_psa, PSA_ALG_SHA_384 );
#else
mbedtls_sha512_init( &handshake->fin_sha512 );
mbedtls_sha512_starts( &handshake->fin_sha512, 1 );
#endif
#endif
handshake->update_checksum = ssl_update_checksum_start;
#if defined(MBEDTLS_DHM_C)
mbedtls_dhm_init( &handshake->dhm_ctx );
#endif
#if !defined(MBEDTLS_USE_PSA_CRYPTO) && defined(MBEDTLS_ECDH_C)
mbedtls_ecdh_init( &handshake->ecdh_ctx );
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
mbedtls_ecjpake_init( &handshake->ecjpake_ctx );
#if defined(MBEDTLS_SSL_CLI_C)
handshake->ecjpake_cache = NULL;
handshake->ecjpake_cache_len = 0;
#endif
#endif
#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
mbedtls_x509_crt_restart_init( &handshake->ecrs_ctx );
#endif
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
!defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
mbedtls_pk_init( &handshake->peer_pubkey );
#endif
}
void mbedtls_ssl_transform_init( mbedtls_ssl_transform *transform )
{
memset( transform, 0, sizeof(mbedtls_ssl_transform) );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
transform->psa_key_enc = MBEDTLS_SVC_KEY_ID_INIT;
transform->psa_key_dec = MBEDTLS_SVC_KEY_ID_INIT;
#else
mbedtls_cipher_init( &transform->cipher_ctx_enc );
mbedtls_cipher_init( &transform->cipher_ctx_dec );
#endif
#if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
transform->psa_mac_enc = MBEDTLS_SVC_KEY_ID_INIT;
transform->psa_mac_dec = MBEDTLS_SVC_KEY_ID_INIT;
#else
mbedtls_md_init( &transform->md_ctx_enc );
mbedtls_md_init( &transform->md_ctx_dec );
#endif
#endif
}
void mbedtls_ssl_session_init( mbedtls_ssl_session *session )
{
memset( session, 0, sizeof(mbedtls_ssl_session) );
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_handshake_init( mbedtls_ssl_context *ssl )
{
/* Clear old handshake information if present */
if( ssl->transform_negotiate )
mbedtls_ssl_transform_free( ssl->transform_negotiate );
if( ssl->session_negotiate )
mbedtls_ssl_session_free( ssl->session_negotiate );
if( ssl->handshake )
mbedtls_ssl_handshake_free( ssl );
/*
* Either the pointers are now NULL or cleared properly and can be freed.
* Now allocate missing structures.
*/
if( ssl->transform_negotiate == NULL )
{
ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) );
}
if( ssl->session_negotiate == NULL )
{
ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) );
}
if( ssl->handshake == NULL )
{
ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) );
}
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
/* If the buffers are too small - reallocate */
handle_buffer_resizing( ssl, 0, MBEDTLS_SSL_IN_BUFFER_LEN,
MBEDTLS_SSL_OUT_BUFFER_LEN );
#endif
/* All pointers should exist and can be directly freed without issue */
if( ssl->handshake == NULL ||
ssl->transform_negotiate == NULL ||
ssl->session_negotiate == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) );
mbedtls_free( ssl->handshake );
mbedtls_free( ssl->transform_negotiate );
mbedtls_free( ssl->session_negotiate );
ssl->handshake = NULL;
ssl->transform_negotiate = NULL;
ssl->session_negotiate = NULL;
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
}
/* Initialize structures */
mbedtls_ssl_session_init( ssl->session_negotiate );
mbedtls_ssl_transform_init( ssl->transform_negotiate );
ssl_handshake_params_init( ssl->handshake );
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{
ssl->handshake->alt_transform_out = ssl->transform_out;
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
else
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
mbedtls_ssl_set_timer( ssl, 0 );
}
#endif
/*
* curve_list is translated to IANA TLS group identifiers here because
* mbedtls_ssl_conf_curves returns void and so can't return
* any error codes.
*/
#if defined(MBEDTLS_ECP_C)
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
/* Heap allocate and translate curve_list from internal to IANA group ids */
if ( ssl->conf->curve_list != NULL )
{
size_t length;
const mbedtls_ecp_group_id *curve_list = ssl->conf->curve_list;
for( length = 0; ( curve_list[length] != MBEDTLS_ECP_DP_NONE ) &&
( length < MBEDTLS_ECP_DP_MAX ); length++ ) {}
/* Leave room for zero termination */
uint16_t *group_list = mbedtls_calloc( length + 1, sizeof(uint16_t) );
if ( group_list == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
for( size_t i = 0; i < length; i++ )
{
const mbedtls_ecp_curve_info *info =
mbedtls_ecp_curve_info_from_grp_id( curve_list[i] );
if ( info == NULL )
{
mbedtls_free( group_list );
return( MBEDTLS_ERR_SSL_BAD_CONFIG );
}
group_list[i] = info->tls_id;
}
group_list[length] = 0;
ssl->handshake->group_list = group_list;
ssl->handshake->group_list_heap_allocated = 1;
}
else
{
ssl->handshake->group_list = ssl->conf->group_list;
ssl->handshake->group_list_heap_allocated = 0;
}
#endif /* MBEDTLS_DEPRECATED_REMOVED */
#endif /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
/* Heap allocate and translate sig_hashes from internal hash identifiers to
signature algorithms IANA identifiers. */
if ( mbedtls_ssl_conf_is_tls12_only( ssl->conf ) &&
ssl->conf->sig_hashes != NULL )
{
const int *md;
const int *sig_hashes = ssl->conf->sig_hashes;
size_t sig_algs_len = 0;
uint16_t *p;
#if defined(static_assert)
static_assert( MBEDTLS_SSL_MAX_SIG_ALG_LIST_LEN
<= ( SIZE_MAX - ( 2 * sizeof(uint16_t) ) ),
"MBEDTLS_SSL_MAX_SIG_ALG_LIST_LEN too big" );
#endif
for( md = sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
{
if( mbedtls_ssl_hash_from_md_alg( *md ) == MBEDTLS_SSL_HASH_NONE )
continue;
#if defined(MBEDTLS_ECDSA_C)
sig_algs_len += sizeof( uint16_t );
#endif
#if defined(MBEDTLS_RSA_C)
sig_algs_len += sizeof( uint16_t );
#endif
if( sig_algs_len > MBEDTLS_SSL_MAX_SIG_ALG_LIST_LEN )
return( MBEDTLS_ERR_SSL_BAD_CONFIG );
}
if( sig_algs_len < MBEDTLS_SSL_MIN_SIG_ALG_LIST_LEN )
return( MBEDTLS_ERR_SSL_BAD_CONFIG );
ssl->handshake->sig_algs = mbedtls_calloc( 1, sig_algs_len +
sizeof( uint16_t ));
if( ssl->handshake->sig_algs == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
p = (uint16_t *)ssl->handshake->sig_algs;
for( md = sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
{
unsigned char hash = mbedtls_ssl_hash_from_md_alg( *md );
if( hash == MBEDTLS_SSL_HASH_NONE )
continue;
#if defined(MBEDTLS_ECDSA_C)
*p = (( hash << 8 ) | MBEDTLS_SSL_SIG_ECDSA);
p++;
#endif
#if defined(MBEDTLS_RSA_C)
*p = (( hash << 8 ) | MBEDTLS_SSL_SIG_RSA);
p++;
#endif
}
*p = MBEDTLS_TLS_SIG_NONE;
ssl->handshake->sig_algs_heap_allocated = 1;
}
else
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
{
ssl->handshake->sig_algs_heap_allocated = 0;
}
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
return( 0 );
}
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
/* Dummy cookie callbacks for defaults */
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_cookie_write_dummy( void *ctx,
unsigned char **p, unsigned char *end,
const unsigned char *cli_id, size_t cli_id_len )
{
((void) ctx);
((void) p);
((void) end);
((void) cli_id);
((void) cli_id_len);
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_cookie_check_dummy( void *ctx,
const unsigned char *cookie, size_t cookie_len,
const unsigned char *cli_id, size_t cli_id_len )
{
((void) ctx);
((void) cookie);
((void) cookie_len);
((void) cli_id);
((void) cli_id_len);
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
/*
* Initialize an SSL context
*/
void mbedtls_ssl_init( mbedtls_ssl_context *ssl )
{
memset( ssl, 0, sizeof( mbedtls_ssl_context ) );
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_conf_version_check( const mbedtls_ssl_context *ssl )
{
const mbedtls_ssl_config *conf = ssl->conf;
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
if( mbedtls_ssl_conf_is_tls13_only( conf ) )
{
if( conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS 1.3 is not yet supported." ) );
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
MBEDTLS_SSL_DEBUG_MSG( 4, ( "The SSL configuration is tls13 only." ) );
return( 0 );
}
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( mbedtls_ssl_conf_is_tls12_only( conf ) )
{
MBEDTLS_SSL_DEBUG_MSG( 4, ( "The SSL configuration is tls12 only." ) );
return( 0 );
}
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && defined(MBEDTLS_SSL_PROTO_TLS1_3)
if( mbedtls_ssl_conf_is_hybrid_tls12_tls13( conf ) )
{
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS not yet supported in Hybrid TLS 1.3 + TLS 1.2" ) );
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
if( conf->endpoint == MBEDTLS_SSL_IS_SERVER )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS 1.3 server is not supported yet." ) );
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
MBEDTLS_SSL_DEBUG_MSG( 4, ( "The SSL configuration is TLS 1.3 or TLS 1.2." ) );
return( 0 );
}
#endif
MBEDTLS_SSL_DEBUG_MSG( 1, ( "The SSL configuration is invalid." ) );
return( MBEDTLS_ERR_SSL_BAD_CONFIG );
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_conf_check(const mbedtls_ssl_context *ssl)
{
int ret;
ret = ssl_conf_version_check( ssl );
if( ret != 0 )
return( ret );
/* Space for further checks */
return( 0 );
}
/*
* Setup an SSL context
*/
int mbedtls_ssl_setup( mbedtls_ssl_context *ssl,
const mbedtls_ssl_config *conf )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN;
size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN;
ssl->conf = conf;
if( ( ret = ssl_conf_check( ssl ) ) != 0 )
return( ret );
/*
* Prepare base structures
*/
/* Set to NULL in case of an error condition */
ssl->out_buf = NULL;
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
ssl->in_buf_len = in_buf_len;
#endif
ssl->in_buf = mbedtls_calloc( 1, in_buf_len );
if( ssl->in_buf == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", in_buf_len ) );
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto error;
}
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
ssl->out_buf_len = out_buf_len;
#endif
ssl->out_buf = mbedtls_calloc( 1, out_buf_len );
if( ssl->out_buf == NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", out_buf_len ) );
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto error;
}
mbedtls_ssl_reset_in_out_pointers( ssl );
#if defined(MBEDTLS_SSL_DTLS_SRTP)
memset( &ssl->dtls_srtp_info, 0, sizeof(ssl->dtls_srtp_info) );
#endif
if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
goto error;
return( 0 );
error:
mbedtls_free( ssl->in_buf );
mbedtls_free( ssl->out_buf );
ssl->conf = NULL;
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
ssl->in_buf_len = 0;
ssl->out_buf_len = 0;
#endif
ssl->in_buf = NULL;
ssl->out_buf = NULL;
ssl->in_hdr = NULL;
ssl->in_ctr = NULL;
ssl->in_len = NULL;
ssl->in_iv = NULL;
ssl->in_msg = NULL;
ssl->out_hdr = NULL;
ssl->out_ctr = NULL;
ssl->out_len = NULL;
ssl->out_iv = NULL;
ssl->out_msg = NULL;
return( ret );
}
/*
* Reset an initialized and used SSL context for re-use while retaining
* all application-set variables, function pointers and data.
*
* If partial is non-zero, keep data in the input buffer and client ID.
* (Use when a DTLS client reconnects from the same port.)
*/
void mbedtls_ssl_session_reset_msg_layer( mbedtls_ssl_context *ssl,
int partial )
{
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
size_t in_buf_len = ssl->in_buf_len;
size_t out_buf_len = ssl->out_buf_len;
#else
size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN;
size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN;
#endif
#if !defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) || !defined(MBEDTLS_SSL_SRV_C)
partial = 0;
#endif
/* Cancel any possibly running timer */
mbedtls_ssl_set_timer( ssl, 0 );
mbedtls_ssl_reset_in_out_pointers( ssl );
/* Reset incoming message parsing */
ssl->in_offt = NULL;
ssl->nb_zero = 0;
ssl->in_msgtype = 0;
ssl->in_msglen = 0;
ssl->in_hslen = 0;
ssl->keep_current_message = 0;
ssl->transform_in = NULL;
#if defined(MBEDTLS_SSL_PROTO_DTLS)
ssl->next_record_offset = 0;
ssl->in_epoch = 0;
#endif
/* Keep current datagram if partial == 1 */
if( partial == 0 )
{
ssl->in_left = 0;
memset( ssl->in_buf, 0, in_buf_len );
}
ssl->send_alert = 0;
/* Reset outgoing message writing */
ssl->out_msgtype = 0;
ssl->out_msglen = 0;
ssl->out_left = 0;
memset( ssl->out_buf, 0, out_buf_len );
memset( ssl->cur_out_ctr, 0, sizeof( ssl->cur_out_ctr ) );
ssl->transform_out = NULL;
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
mbedtls_ssl_dtls_replay_reset( ssl );
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( ssl->transform )
{
mbedtls_ssl_transform_free( ssl->transform );
mbedtls_free( ssl->transform );
ssl->transform = NULL;
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
mbedtls_ssl_transform_free( ssl->transform_application );
mbedtls_free( ssl->transform_application );
ssl->transform_application = NULL;
if( ssl->handshake != NULL )
{
mbedtls_ssl_transform_free( ssl->handshake->transform_earlydata );
mbedtls_free( ssl->handshake->transform_earlydata );
ssl->handshake->transform_earlydata = NULL;
mbedtls_ssl_transform_free( ssl->handshake->transform_handshake );
mbedtls_free( ssl->handshake->transform_handshake );
ssl->handshake->transform_handshake = NULL;
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
}
int mbedtls_ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
mbedtls_ssl_session_reset_msg_layer( ssl, partial );
/* Reset renegotiation state */
#if defined(MBEDTLS_SSL_RENEGOTIATION)
ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE;
ssl->renego_records_seen = 0;
ssl->verify_data_len = 0;
memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
#endif
ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION;
ssl->session_in = NULL;
ssl->session_out = NULL;
if( ssl->session )
{
mbedtls_ssl_session_free( ssl->session );
mbedtls_free( ssl->session );
ssl->session = NULL;
}
#if defined(MBEDTLS_SSL_ALPN)
ssl->alpn_chosen = NULL;
#endif
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE)
if( partial == 0 )
#endif
{
mbedtls_free( ssl->cli_id );
ssl->cli_id = NULL;
ssl->cli_id_len = 0;
}
#endif
if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
return( ret );
return( 0 );
}
/*
* Reset an initialized and used SSL context for re-use while retaining
* all application-set variables, function pointers and data.
*/
int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl )
{
return( mbedtls_ssl_session_reset_int( ssl, 0 ) );
}
/*
* SSL set accessors
*/
void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint )
{
conf->endpoint = endpoint;
}
void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport )
{
conf->transport = transport;
}
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode )
{
conf->anti_replay = mode;
}
#endif
void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit )
{
conf->badmac_limit = limit;
}
#if defined(MBEDTLS_SSL_PROTO_DTLS)
void mbedtls_ssl_set_datagram_packing( mbedtls_ssl_context *ssl,
unsigned allow_packing )
{
ssl->disable_datagram_packing = !allow_packing;
}
void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf,
uint32_t min, uint32_t max )
{
conf->hs_timeout_min = min;
conf->hs_timeout_max = max;
}
#endif
void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode )
{
conf->authmode = authmode;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy )
{
conf->f_vrfy = f_vrfy;
conf->p_vrfy = p_vrfy;
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
conf->f_rng = f_rng;
conf->p_rng = p_rng;
}
void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
void (*f_dbg)(void *, int, const char *, int, const char *),
void *p_dbg )
{
conf->f_dbg = f_dbg;
conf->p_dbg = p_dbg;
}
void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl,
void *p_bio,
mbedtls_ssl_send_t *f_send,
mbedtls_ssl_recv_t *f_recv,
mbedtls_ssl_recv_timeout_t *f_recv_timeout )
{
ssl->p_bio = p_bio;
ssl->f_send = f_send;
ssl->f_recv = f_recv;
ssl->f_recv_timeout = f_recv_timeout;
}
#if defined(MBEDTLS_SSL_PROTO_DTLS)
void mbedtls_ssl_set_mtu( mbedtls_ssl_context *ssl, uint16_t mtu )
{
ssl->mtu = mtu;
}
#endif
void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout )
{
conf->read_timeout = timeout;
}
void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
void *p_timer,
mbedtls_ssl_set_timer_t *f_set_timer,
mbedtls_ssl_get_timer_t *f_get_timer )
{
ssl->p_timer = p_timer;
ssl->f_set_timer = f_set_timer;
ssl->f_get_timer = f_get_timer;
/* Make sure we start with no timer running */
mbedtls_ssl_set_timer( ssl, 0 );
}
#if defined(MBEDTLS_SSL_SRV_C)
void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf,
void *p_cache,
mbedtls_ssl_cache_get_t *f_get_cache,
mbedtls_ssl_cache_set_t *f_set_cache )
{
conf->p_cache = p_cache;
conf->f_get_cache = f_get_cache;
conf->f_set_cache = f_set_cache;
}
#endif /* MBEDTLS_SSL_SRV_C */
#if defined(MBEDTLS_SSL_CLI_C)
int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if( ssl == NULL ||
session == NULL ||
ssl->session_negotiate == NULL ||
ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
if( ssl->handshake->resume == 1 )
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
if( ( ret = mbedtls_ssl_session_copy( ssl->session_negotiate,
session ) ) != 0 )
return( ret );
ssl->handshake->resume = 1;
return( 0 );
}
#endif /* MBEDTLS_SSL_CLI_C */
void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf,
const int *ciphersuites )
{
conf->ciphersuite_list = ciphersuites;
}
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
void mbedtls_ssl_conf_tls13_key_exchange_modes( mbedtls_ssl_config *conf,
const int kex_modes )
{
conf->tls13_kex_modes = kex_modes & MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_ALL;
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf,
const mbedtls_x509_crt_profile *profile )
{
conf->cert_profile = profile;
}
static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert )
{
mbedtls_ssl_key_cert *cur = key_cert, *next;
while( cur != NULL )
{
next = cur->next;
mbedtls_free( cur );
cur = next;
}
}
/* Append a new keycert entry to a (possibly empty) list */
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_append_key_cert( mbedtls_ssl_key_cert **head,
mbedtls_x509_crt *cert,
mbedtls_pk_context *key )
{
mbedtls_ssl_key_cert *new_cert;
if( cert == NULL )
{
/* Free list if cert is null */
ssl_key_cert_free( *head );
*head = NULL;
return( 0 );
}
new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
if( new_cert == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
new_cert->cert = cert;
new_cert->key = key;
new_cert->next = NULL;
/* Update head if the list was null, else add to the end */
if( *head == NULL )
{
*head = new_cert;
}
else
{
mbedtls_ssl_key_cert *cur = *head;
while( cur->next != NULL )
cur = cur->next;
cur->next = new_cert;
}
return( 0 );
}
int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf,
mbedtls_x509_crt *own_cert,
mbedtls_pk_context *pk_key )
{
return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) );
}
void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf,
mbedtls_x509_crt *ca_chain,
mbedtls_x509_crl *ca_crl )
{
conf->ca_chain = ca_chain;
conf->ca_crl = ca_crl;
#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
/* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb()
* cannot be used together. */
conf->f_ca_cb = NULL;
conf->p_ca_cb = NULL;
#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
}
#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
void mbedtls_ssl_conf_ca_cb( mbedtls_ssl_config *conf,
mbedtls_x509_crt_ca_cb_t f_ca_cb,
void *p_ca_cb )
{
conf->f_ca_cb = f_ca_cb;
conf->p_ca_cb = p_ca_cb;
/* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb()
* cannot be used together. */
conf->ca_chain = NULL;
conf->ca_crl = NULL;
}
#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
const unsigned char *mbedtls_ssl_get_hs_sni( mbedtls_ssl_context *ssl,
size_t *name_len )
{
*name_len = ssl->handshake->sni_name_len;
return( ssl->handshake->sni_name );
}
int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl,
mbedtls_x509_crt *own_cert,
mbedtls_pk_context *pk_key )
{
return( ssl_append_key_cert( &ssl->handshake->sni_key_cert,
own_cert, pk_key ) );
}
void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl,
mbedtls_x509_crt *ca_chain,
mbedtls_x509_crl *ca_crl )
{
ssl->handshake->sni_ca_chain = ca_chain;
ssl->handshake->sni_ca_crl = ca_crl;
}
#if defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED)
void mbedtls_ssl_set_hs_dn_hints( mbedtls_ssl_context *ssl,
const mbedtls_x509_crt *crt)
{
ssl->handshake->dn_hints = crt;
}
#endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl,
int authmode )
{
ssl->handshake->sni_authmode = authmode;
}
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
void mbedtls_ssl_set_verify( mbedtls_ssl_context *ssl,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy )
{
ssl->f_vrfy = f_vrfy;
ssl->p_vrfy = p_vrfy;
}
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
/*
* Set EC J-PAKE password for current handshake
*/
int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl,
const unsigned char *pw,
size_t pw_len )
{
mbedtls_ecjpake_role role;
if( ssl->handshake == NULL || ssl->conf == NULL )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
role = MBEDTLS_ECJPAKE_SERVER;
else
role = MBEDTLS_ECJPAKE_CLIENT;
return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx,
role,
MBEDTLS_MD_SHA256,
MBEDTLS_ECP_DP_SECP256R1,
pw, pw_len ) );
}
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_conf_psk_is_configured( mbedtls_ssl_config const *conf )
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( !mbedtls_svc_key_id_is_null( conf->psk_opaque ) )
return( 1 );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( conf->psk != NULL )
return( 1 );
return( 0 );
}
static void ssl_conf_remove_psk( mbedtls_ssl_config *conf )
{
/* Remove reference to existing PSK, if any. */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ! mbedtls_svc_key_id_is_null( conf->psk_opaque ) )
{
/* The maintenance of the PSK key slot is the
* user's responsibility. */
conf->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( conf->psk != NULL )
{
mbedtls_platform_zeroize( conf->psk, conf->psk_len );
mbedtls_free( conf->psk );
conf->psk = NULL;
conf->psk_len = 0;
}
/* Remove reference to PSK identity, if any. */
if( conf->psk_identity != NULL )
{
mbedtls_free( conf->psk_identity );
conf->psk_identity = NULL;
conf->psk_identity_len = 0;
}
}
/* This function assumes that PSK identity in the SSL config is unset.
* It checks that the provided identity is well-formed and attempts
* to make a copy of it in the SSL config.
* On failure, the PSK identity in the config remains unset. */
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_conf_set_psk_identity( mbedtls_ssl_config *conf,
unsigned char const *psk_identity,
size_t psk_identity_len )
{
/* Identity len will be encoded on two bytes */
if( psk_identity == NULL ||
( psk_identity_len >> 16 ) != 0 ||
psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
conf->psk_identity = mbedtls_calloc( 1, psk_identity_len );
if( conf->psk_identity == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
conf->psk_identity_len = psk_identity_len;
memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len );
return( 0 );
}
int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
const unsigned char *psk, size_t psk_len,
const unsigned char *psk_identity, size_t psk_identity_len )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/* We currently only support one PSK, raw or opaque. */
if( ssl_conf_psk_is_configured( conf ) )
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
/* Check and set raw PSK */
if( psk == NULL )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( psk_len == 0 )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( psk_len > MBEDTLS_PSK_MAX_LEN )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
conf->psk_len = psk_len;
memcpy( conf->psk, psk, conf->psk_len );
/* Check and set PSK Identity */
ret = ssl_conf_set_psk_identity( conf, psk_identity, psk_identity_len );
if( ret != 0 )
ssl_conf_remove_psk( conf );
return( ret );
}
static void ssl_remove_psk( mbedtls_ssl_context *ssl )
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ! mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) )
{
/* The maintenance of the external PSK key slot is the
* user's responsibility. */
if( ssl->handshake->psk_opaque_is_internal )
{
psa_destroy_key( ssl->handshake->psk_opaque );
ssl->handshake->psk_opaque_is_internal = 0;
}
ssl->handshake->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT;
}
#else
if( ssl->handshake->psk != NULL )
{
mbedtls_platform_zeroize( ssl->handshake->psk,
ssl->handshake->psk_len );
mbedtls_free( ssl->handshake->psk );
ssl->handshake->psk_len = 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
}
int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
const unsigned char *psk, size_t psk_len )
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_key_attributes_t key_attributes = psa_key_attributes_init();
psa_status_t status;
psa_algorithm_t alg;
mbedtls_svc_key_id_t key;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( psk == NULL || ssl->handshake == NULL )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( psk_len > MBEDTLS_PSK_MAX_LEN )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
ssl_remove_psk( ssl );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ssl->handshake->ciphersuite_info->mac == MBEDTLS_MD_SHA384)
alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384);
else
alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256);
psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
psa_set_key_algorithm( &key_attributes, alg );
psa_set_key_type( &key_attributes, PSA_KEY_TYPE_DERIVE );
status = psa_import_key( &key_attributes, psk, psk_len, &key );
if( status != PSA_SUCCESS )
return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
/* Allow calling psa_destroy_key() on psk remove */
ssl->handshake->psk_opaque_is_internal = 1;
return mbedtls_ssl_set_hs_psk_opaque( ssl, key );
#else
if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
ssl->handshake->psk_len = psk_len;
memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len );
return( 0 );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int mbedtls_ssl_conf_psk_opaque( mbedtls_ssl_config *conf,
mbedtls_svc_key_id_t psk,
const unsigned char *psk_identity,
size_t psk_identity_len )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/* We currently only support one PSK, raw or opaque. */
if( ssl_conf_psk_is_configured( conf ) )
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
/* Check and set opaque PSK */
if( mbedtls_svc_key_id_is_null( psk ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
conf->psk_opaque = psk;
/* Check and set PSK Identity */
ret = ssl_conf_set_psk_identity( conf, psk_identity,
psk_identity_len );
if( ret != 0 )
ssl_conf_remove_psk( conf );
return( ret );
}
int mbedtls_ssl_set_hs_psk_opaque( mbedtls_ssl_context *ssl,
mbedtls_svc_key_id_t psk )
{
if( ( mbedtls_svc_key_id_is_null( psk ) ) ||
( ssl->handshake == NULL ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
ssl_remove_psk( ssl );
ssl->handshake->psk_opaque = psk;
return( 0 );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf,
int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
size_t),
void *p_psk )
{
conf->f_psk = f_psk;
conf->p_psk = p_psk;
}
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static mbedtls_ssl_mode_t mbedtls_ssl_get_base_mode(
psa_algorithm_t alg )
{
#if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC)
if( alg == PSA_ALG_CBC_NO_PADDING )
return( MBEDTLS_SSL_MODE_CBC );
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */
if( PSA_ALG_IS_AEAD( alg ) )
return( MBEDTLS_SSL_MODE_AEAD );
return( MBEDTLS_SSL_MODE_STREAM );
}
#else /* MBEDTLS_USE_PSA_CRYPTO */
static mbedtls_ssl_mode_t mbedtls_ssl_get_base_mode(
mbedtls_cipher_mode_t mode )
{
#if defined(MBEDTLS_SSL_SOME_SUITES_USE_MAC)
if( mode == MBEDTLS_MODE_CBC )
return( MBEDTLS_SSL_MODE_CBC );
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */
#if defined(MBEDTLS_GCM_C) || \
defined(MBEDTLS_CCM_C) || \
defined(MBEDTLS_CHACHAPOLY_C)
if( mode == MBEDTLS_MODE_GCM ||
mode == MBEDTLS_MODE_CCM ||
mode == MBEDTLS_MODE_CHACHAPOLY )
return( MBEDTLS_SSL_MODE_AEAD );
#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C */
return( MBEDTLS_SSL_MODE_STREAM );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
static mbedtls_ssl_mode_t mbedtls_ssl_get_actual_mode(
mbedtls_ssl_mode_t base_mode,
int encrypt_then_mac )
{
#if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM)
if( encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED &&
base_mode == MBEDTLS_SSL_MODE_CBC )
{
return( MBEDTLS_SSL_MODE_CBC_ETM );
}
#else
(void) encrypt_then_mac;
#endif
return( base_mode );
}
mbedtls_ssl_mode_t mbedtls_ssl_get_mode_from_transform(
const mbedtls_ssl_transform *transform )
{
mbedtls_ssl_mode_t base_mode = mbedtls_ssl_get_base_mode(
#if defined(MBEDTLS_USE_PSA_CRYPTO)
transform->psa_alg
#else
mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc )
#endif
);
int encrypt_then_mac = 0;
#if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM)
encrypt_then_mac = transform->encrypt_then_mac;
#endif
return( mbedtls_ssl_get_actual_mode( base_mode, encrypt_then_mac ) );
}
mbedtls_ssl_mode_t mbedtls_ssl_get_mode_from_ciphersuite(
#if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM)
int encrypt_then_mac,
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM */
const mbedtls_ssl_ciphersuite_t *suite )
{
mbedtls_ssl_mode_t base_mode = MBEDTLS_SSL_MODE_STREAM;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_status_t status;
psa_algorithm_t alg;
psa_key_type_t type;
size_t size;
status = mbedtls_ssl_cipher_to_psa( suite->cipher, 0, &alg, &type, &size );
if( status == PSA_SUCCESS )
base_mode = mbedtls_ssl_get_base_mode( alg );
#else
const mbedtls_cipher_info_t *cipher =
mbedtls_cipher_info_from_type( suite->cipher );
if( cipher != NULL )
{
base_mode =
mbedtls_ssl_get_base_mode(
mbedtls_cipher_info_get_mode( cipher ) );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if !defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC_ETM)
int encrypt_then_mac = 0;
#endif
return( mbedtls_ssl_get_actual_mode( base_mode, encrypt_then_mac ) );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO) || defined(MBEDTLS_SSL_PROTO_TLS1_3)
psa_status_t mbedtls_ssl_cipher_to_psa( mbedtls_cipher_type_t mbedtls_cipher_type,
size_t taglen,
psa_algorithm_t *alg,
psa_key_type_t *key_type,
size_t *key_size )
{
switch ( mbedtls_cipher_type )
{
case MBEDTLS_CIPHER_AES_128_CBC:
*alg = PSA_ALG_CBC_NO_PADDING;
*key_type = PSA_KEY_TYPE_AES;
*key_size = 128;
break;
case MBEDTLS_CIPHER_AES_128_CCM:
*alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, taglen ) : PSA_ALG_CCM;
*key_type = PSA_KEY_TYPE_AES;
*key_size = 128;
break;
case MBEDTLS_CIPHER_AES_128_GCM:
*alg = PSA_ALG_GCM;
*key_type = PSA_KEY_TYPE_AES;
*key_size = 128;
break;
case MBEDTLS_CIPHER_AES_192_CCM:
*alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, taglen ) : PSA_ALG_CCM;
*key_type = PSA_KEY_TYPE_AES;
*key_size = 192;
break;
case MBEDTLS_CIPHER_AES_192_GCM:
*alg = PSA_ALG_GCM;
*key_type = PSA_KEY_TYPE_AES;
*key_size = 192;
break;
case MBEDTLS_CIPHER_AES_256_CBC:
*alg = PSA_ALG_CBC_NO_PADDING;
*key_type = PSA_KEY_TYPE_AES;
*key_size = 256;
break;
case MBEDTLS_CIPHER_AES_256_CCM:
*alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, taglen ) : PSA_ALG_CCM;
*key_type = PSA_KEY_TYPE_AES;
*key_size = 256;
break;
case MBEDTLS_CIPHER_AES_256_GCM:
*alg = PSA_ALG_GCM;
*key_type = PSA_KEY_TYPE_AES;
*key_size = 256;
break;
case MBEDTLS_CIPHER_ARIA_128_CBC:
*alg = PSA_ALG_CBC_NO_PADDING;
*key_type = PSA_KEY_TYPE_ARIA;
*key_size = 128;
break;
case MBEDTLS_CIPHER_ARIA_128_CCM:
*alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, taglen ) : PSA_ALG_CCM;
*key_type = PSA_KEY_TYPE_ARIA;
*key_size = 128;
break;
case MBEDTLS_CIPHER_ARIA_128_GCM:
*alg = PSA_ALG_GCM;
*key_type = PSA_KEY_TYPE_ARIA;
*key_size = 128;
break;
case MBEDTLS_CIPHER_ARIA_192_CCM:
*alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, taglen ) : PSA_ALG_CCM;
*key_type = PSA_KEY_TYPE_ARIA;
*key_size = 192;
break;
case MBEDTLS_CIPHER_ARIA_192_GCM:
*alg = PSA_ALG_GCM;
*key_type = PSA_KEY_TYPE_ARIA;
*key_size = 192;
break;
case MBEDTLS_CIPHER_ARIA_256_CBC:
*alg = PSA_ALG_CBC_NO_PADDING;
*key_type = PSA_KEY_TYPE_ARIA;
*key_size = 256;
break;
case MBEDTLS_CIPHER_ARIA_256_CCM:
*alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, taglen ) : PSA_ALG_CCM;
*key_type = PSA_KEY_TYPE_ARIA;
*key_size = 256;
break;
case MBEDTLS_CIPHER_ARIA_256_GCM:
*alg = PSA_ALG_GCM;
*key_type = PSA_KEY_TYPE_ARIA;
*key_size = 256;
break;
case MBEDTLS_CIPHER_CAMELLIA_128_CBC:
*alg = PSA_ALG_CBC_NO_PADDING;
*key_type = PSA_KEY_TYPE_CAMELLIA;
*key_size = 128;
break;
case MBEDTLS_CIPHER_CAMELLIA_128_CCM:
*alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, taglen ) : PSA_ALG_CCM;
*key_type = PSA_KEY_TYPE_CAMELLIA;
*key_size = 128;
break;
case MBEDTLS_CIPHER_CAMELLIA_128_GCM:
*alg = PSA_ALG_GCM;
*key_type = PSA_KEY_TYPE_CAMELLIA;
*key_size = 128;
break;
case MBEDTLS_CIPHER_CAMELLIA_192_CCM:
*alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, taglen ) : PSA_ALG_CCM;
*key_type = PSA_KEY_TYPE_CAMELLIA;
*key_size = 192;
break;
case MBEDTLS_CIPHER_CAMELLIA_192_GCM:
*alg = PSA_ALG_GCM;
*key_type = PSA_KEY_TYPE_CAMELLIA;
*key_size = 192;
break;
case MBEDTLS_CIPHER_CAMELLIA_256_CBC:
*alg = PSA_ALG_CBC_NO_PADDING;
*key_type = PSA_KEY_TYPE_CAMELLIA;
*key_size = 256;
break;
case MBEDTLS_CIPHER_CAMELLIA_256_CCM:
*alg = taglen ? PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, taglen ) : PSA_ALG_CCM;
*key_type = PSA_KEY_TYPE_CAMELLIA;
*key_size = 256;
break;
case MBEDTLS_CIPHER_CAMELLIA_256_GCM:
*alg = PSA_ALG_GCM;
*key_type = PSA_KEY_TYPE_CAMELLIA;
*key_size = 256;
break;
case MBEDTLS_CIPHER_CHACHA20_POLY1305:
*alg = PSA_ALG_CHACHA20_POLY1305;
*key_type = PSA_KEY_TYPE_CHACHA20;
*key_size = 256;
break;
case MBEDTLS_CIPHER_NULL:
*alg = MBEDTLS_SSL_NULL_CIPHER;
*key_type = 0;
*key_size = 0;
break;
default:
return PSA_ERROR_NOT_SUPPORTED;
}
return PSA_SUCCESS;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO || MBEDTLS_SSL_PROTO_TLS1_3 */
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
int mbedtls_ssl_conf_dh_param_bin( mbedtls_ssl_config *conf,
const unsigned char *dhm_P, size_t P_len,
const unsigned char *dhm_G, size_t G_len )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_mpi_free( &conf->dhm_P );
mbedtls_mpi_free( &conf->dhm_G );
if( ( ret = mbedtls_mpi_read_binary( &conf->dhm_P, dhm_P, P_len ) ) != 0 ||
( ret = mbedtls_mpi_read_binary( &conf->dhm_G, dhm_G, G_len ) ) != 0 )
{
mbedtls_mpi_free( &conf->dhm_P );
mbedtls_mpi_free( &conf->dhm_G );
return( ret );
}
return( 0 );
}
int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_mpi_free( &conf->dhm_P );
mbedtls_mpi_free( &conf->dhm_G );
if( ( ret = mbedtls_dhm_get_value( dhm_ctx, MBEDTLS_DHM_PARAM_P,
&conf->dhm_P ) ) != 0 ||
( ret = mbedtls_dhm_get_value( dhm_ctx, MBEDTLS_DHM_PARAM_G,
&conf->dhm_G ) ) != 0 )
{
mbedtls_mpi_free( &conf->dhm_P );
mbedtls_mpi_free( &conf->dhm_G );
return( ret );
}
return( 0 );
}
#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
/*
* Set the minimum length for Diffie-Hellman parameters
*/
void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
unsigned int bitlen )
{
conf->dhm_min_bitlen = bitlen;
}
#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
#if !defined(MBEDTLS_DEPRECATED_REMOVED) && defined(MBEDTLS_SSL_PROTO_TLS1_2)
/*
* Set allowed/preferred hashes for handshake signatures
*/
void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf,
const int *hashes )
{
conf->sig_hashes = hashes;
}
#endif /* !MBEDTLS_DEPRECATED_REMOVED && MBEDTLS_SSL_PROTO_TLS1_2 */
/* Configure allowed signature algorithms for handshake */
void mbedtls_ssl_conf_sig_algs( mbedtls_ssl_config *conf,
const uint16_t* sig_algs )
{
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
conf->sig_hashes = NULL;
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
conf->sig_algs = sig_algs;
}
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
#if defined(MBEDTLS_ECP_C)
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
/*
* Set the allowed elliptic curves
*
* mbedtls_ssl_setup() takes the provided list
* and translates it to a list of IANA TLS group identifiers,
* stored in ssl->handshake->group_list.
*
*/
void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf,
const mbedtls_ecp_group_id *curve_list )
{
conf->curve_list = curve_list;
conf->group_list = NULL;
}
#endif /* MBEDTLS_DEPRECATED_REMOVED */
#endif /* MBEDTLS_ECP_C */
/*
* Set the allowed groups
*/
void mbedtls_ssl_conf_groups( mbedtls_ssl_config *conf,
const uint16_t *group_list )
{
#if defined(MBEDTLS_ECP_C) && !defined(MBEDTLS_DEPRECATED_REMOVED)
conf->curve_list = NULL;
#endif
conf->group_list = group_list;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname )
{
/* Initialize to suppress unnecessary compiler warning */
size_t hostname_len = 0;
/* Check if new hostname is valid before
* making any change to current one */
if( hostname != NULL )
{
hostname_len = strlen( hostname );
if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
/* Now it's clear that we will overwrite the old hostname,
* so we can free it safely */
if( ssl->hostname != NULL )
{
mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) );
mbedtls_free( ssl->hostname );
}
/* Passing NULL as hostname shall clear the old one */
if( hostname == NULL )
{
ssl->hostname = NULL;
}
else
{
ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 );
if( ssl->hostname == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
memcpy( ssl->hostname, hostname, hostname_len );
ssl->hostname[hostname_len] = '\0';
}
return( 0 );
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf,
int (*f_sni)(void *, mbedtls_ssl_context *,
const unsigned char *, size_t),
void *p_sni )
{
conf->f_sni = f_sni;
conf->p_sni = p_sni;
}
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
#if defined(MBEDTLS_SSL_ALPN)
int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos )
{
size_t cur_len, tot_len;
const char **p;
/*
* RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings
* MUST NOT be truncated."
* We check lengths now rather than later.
*/
tot_len = 0;
for( p = protos; *p != NULL; p++ )
{
cur_len = strlen( *p );
tot_len += cur_len;
if( ( cur_len == 0 ) ||
( cur_len > MBEDTLS_SSL_MAX_ALPN_NAME_LEN ) ||
( tot_len > MBEDTLS_SSL_MAX_ALPN_LIST_LEN ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
conf->alpn_list = protos;
return( 0 );
}
const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl )
{
return( ssl->alpn_chosen );
}
#endif /* MBEDTLS_SSL_ALPN */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
void mbedtls_ssl_conf_srtp_mki_value_supported( mbedtls_ssl_config *conf,
int support_mki_value )
{
conf->dtls_srtp_mki_support = support_mki_value;
}
int mbedtls_ssl_dtls_srtp_set_mki_value( mbedtls_ssl_context *ssl,
unsigned char *mki_value,
uint16_t mki_len )
{
if( mki_len > MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
if( ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_UNSUPPORTED )
{
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
memcpy( ssl->dtls_srtp_info.mki_value, mki_value, mki_len );
ssl->dtls_srtp_info.mki_len = mki_len;
return( 0 );
}
int mbedtls_ssl_conf_dtls_srtp_protection_profiles( mbedtls_ssl_config *conf,
const mbedtls_ssl_srtp_profile *profiles )
{
const mbedtls_ssl_srtp_profile *p;
size_t list_size = 0;
/* check the profiles list: all entry must be valid,
* its size cannot be more than the total number of supported profiles, currently 4 */
for( p = profiles; *p != MBEDTLS_TLS_SRTP_UNSET &&
list_size <= MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH;
p++ )
{
if( mbedtls_ssl_check_srtp_profile_value( *p ) != MBEDTLS_TLS_SRTP_UNSET )
{
list_size++;
}
else
{
/* unsupported value, stop parsing and set the size to an error value */
list_size = MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH + 1;
}
}
if( list_size > MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH )
{
conf->dtls_srtp_profile_list = NULL;
conf->dtls_srtp_profile_list_len = 0;
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
conf->dtls_srtp_profile_list = profiles;
conf->dtls_srtp_profile_list_len = list_size;
return( 0 );
}
void mbedtls_ssl_get_dtls_srtp_negotiation_result( const mbedtls_ssl_context *ssl,
mbedtls_dtls_srtp_info *dtls_srtp_info )
{
dtls_srtp_info->chosen_dtls_srtp_profile = ssl->dtls_srtp_info.chosen_dtls_srtp_profile;
/* do not copy the mki value if there is no chosen profile */
if( dtls_srtp_info->chosen_dtls_srtp_profile == MBEDTLS_TLS_SRTP_UNSET )
{
dtls_srtp_info->mki_len = 0;
}
else
{
dtls_srtp_info->mki_len = ssl->dtls_srtp_info.mki_len;
memcpy( dtls_srtp_info->mki_value, ssl->dtls_srtp_info.mki_value,
ssl->dtls_srtp_info.mki_len );
}
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */
void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
{
conf->max_tls_version = (major << 8) | minor;
}
void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor )
{
conf->min_tls_version = (major << 8) | minor;
}
#if defined(MBEDTLS_SSL_SRV_C)
void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf,
char cert_req_ca_list )
{
conf->cert_req_ca_list = cert_req_ca_list;
}
#endif
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm )
{
conf->encrypt_then_mac = etm;
}
#endif
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems )
{
conf->extended_ms = ems;
}
#endif
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code )
{
if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
ssl_mfl_code_to_length( mfl_code ) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
conf->mfl_code = mfl_code;
return( 0 );
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy )
{
conf->allow_legacy_renegotiation = allow_legacy;
}
#if defined(MBEDTLS_SSL_RENEGOTIATION)
void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation )
{
conf->disable_renegotiation = renegotiation;
}
void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records )
{
conf->renego_max_records = max_records;
}
void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf,
const unsigned char period[8] )
{
memcpy( conf->renego_period, period, 8 );
}
#endif /* MBEDTLS_SSL_RENEGOTIATION */
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
#if defined(MBEDTLS_SSL_CLI_C)
void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets )
{
conf->session_tickets = use_tickets;
}
#endif
#if defined(MBEDTLS_SSL_SRV_C)
void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf,
mbedtls_ssl_ticket_write_t *f_ticket_write,
mbedtls_ssl_ticket_parse_t *f_ticket_parse,
void *p_ticket )
{
conf->f_ticket_write = f_ticket_write;
conf->f_ticket_parse = f_ticket_parse;
conf->p_ticket = p_ticket;
}
#endif
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
void mbedtls_ssl_set_export_keys_cb( mbedtls_ssl_context *ssl,
mbedtls_ssl_export_keys_t *f_export_keys,
void *p_export_keys )
{
ssl->f_export_keys = f_export_keys;
ssl->p_export_keys = p_export_keys;
}
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
void mbedtls_ssl_conf_async_private_cb(
mbedtls_ssl_config *conf,
mbedtls_ssl_async_sign_t *f_async_sign,
mbedtls_ssl_async_decrypt_t *f_async_decrypt,
mbedtls_ssl_async_resume_t *f_async_resume,
mbedtls_ssl_async_cancel_t *f_async_cancel,
void *async_config_data )
{
conf->f_async_sign_start = f_async_sign;
conf->f_async_decrypt_start = f_async_decrypt;
conf->f_async_resume = f_async_resume;
conf->f_async_cancel = f_async_cancel;
conf->p_async_config_data = async_config_data;
}
void *mbedtls_ssl_conf_get_async_config_data( const mbedtls_ssl_config *conf )
{
return( conf->p_async_config_data );
}
void *mbedtls_ssl_get_async_operation_data( const mbedtls_ssl_context *ssl )
{
if( ssl->handshake == NULL )
return( NULL );
else
return( ssl->handshake->user_async_ctx );
}
void mbedtls_ssl_set_async_operation_data( mbedtls_ssl_context *ssl,
void *ctx )
{
if( ssl->handshake != NULL )
ssl->handshake->user_async_ctx = ctx;
}
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
/*
* SSL get accessors
*/
uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
{
if( ssl->session != NULL )
return( ssl->session->verify_result );
if( ssl->session_negotiate != NULL )
return( ssl->session_negotiate->verify_result );
return( 0xFFFFFFFF );
}
int mbedtls_ssl_get_ciphersuite_id_from_ssl( const mbedtls_ssl_context *ssl )
{
if( ssl == NULL || ssl->session == NULL )
return( 0 );
return( ssl->session->ciphersuite );
}
const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl )
{
if( ssl == NULL || ssl->session == NULL )
return( NULL );
return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite );
}
const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl )
{
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
{
switch( ssl->tls_version )
{
case MBEDTLS_SSL_VERSION_TLS1_2:
return( "DTLSv1.2" );
default:
return( "unknown (DTLS)" );
}
}
#endif
switch( ssl->tls_version )
{
case MBEDTLS_SSL_VERSION_TLS1_2:
return( "TLSv1.2" );
case MBEDTLS_SSL_VERSION_TLS1_3:
return( "TLSv1.3" );
default:
return( "unknown" );
}
}
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
size_t mbedtls_ssl_get_input_max_frag_len( const mbedtls_ssl_context *ssl )
{
size_t max_len = MBEDTLS_SSL_IN_CONTENT_LEN;
size_t read_mfl;
/* Use the configured MFL for the client if we're past SERVER_HELLO_DONE */
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
ssl->state >= MBEDTLS_SSL_SERVER_HELLO_DONE )
{
return ssl_mfl_code_to_length( ssl->conf->mfl_code );
}
/* Check if a smaller max length was negotiated */
if( ssl->session_out != NULL )
{
read_mfl = ssl_mfl_code_to_length( ssl->session_out->mfl_code );
if( read_mfl < max_len )
{
max_len = read_mfl;
}
}
// During a handshake, use the value being negotiated
if( ssl->session_negotiate != NULL )
{
read_mfl = ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code );
if( read_mfl < max_len )
{
max_len = read_mfl;
}
}
return( max_len );
}
size_t mbedtls_ssl_get_output_max_frag_len( const mbedtls_ssl_context *ssl )
{
size_t max_len;
/*
* Assume mfl_code is correct since it was checked when set
*/
max_len = ssl_mfl_code_to_length( ssl->conf->mfl_code );
/* Check if a smaller max length was negotiated */
if( ssl->session_out != NULL &&
ssl_mfl_code_to_length( ssl->session_out->mfl_code ) < max_len )
{
max_len = ssl_mfl_code_to_length( ssl->session_out->mfl_code );
}
/* During a handshake, use the value being negotiated */
if( ssl->session_negotiate != NULL &&
ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code ) < max_len )
{
max_len = ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code );
}
return( max_len );
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
size_t mbedtls_ssl_get_current_mtu( const mbedtls_ssl_context *ssl )
{
/* Return unlimited mtu for client hello messages to avoid fragmentation. */
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
( ssl->state == MBEDTLS_SSL_CLIENT_HELLO ||
ssl->state == MBEDTLS_SSL_SERVER_HELLO ) )
return ( 0 );
if( ssl->handshake == NULL || ssl->handshake->mtu == 0 )
return( ssl->mtu );
if( ssl->mtu == 0 )
return( ssl->handshake->mtu );
return( ssl->mtu < ssl->handshake->mtu ?
ssl->mtu : ssl->handshake->mtu );
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl )
{
size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \
!defined(MBEDTLS_SSL_PROTO_DTLS)
(void) ssl;
#endif
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
const size_t mfl = mbedtls_ssl_get_output_max_frag_len( ssl );
if( max_len > mfl )
max_len = mfl;
#endif
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( mbedtls_ssl_get_current_mtu( ssl ) != 0 )
{
const size_t mtu = mbedtls_ssl_get_current_mtu( ssl );
const int ret = mbedtls_ssl_get_record_expansion( ssl );
const size_t overhead = (size_t) ret;
if( ret < 0 )
return( ret );
if( mtu <= overhead )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "MTU too low for record expansion" ) );
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
if( max_len > mtu - overhead )
max_len = mtu - overhead;
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \
!defined(MBEDTLS_SSL_PROTO_DTLS)
((void) ssl);
#endif
return( (int) max_len );
}
int mbedtls_ssl_get_max_in_record_payload( const mbedtls_ssl_context *ssl )
{
size_t max_len = MBEDTLS_SSL_IN_CONTENT_LEN;
#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
(void) ssl;
#endif
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
const size_t mfl = mbedtls_ssl_get_input_max_frag_len( ssl );
if( max_len > mfl )
max_len = mfl;
#endif
return( (int) max_len );
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
{
if( ssl == NULL || ssl->session == NULL )
return( NULL );
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
return( ssl->session->peer_cert );
#else
return( NULL );
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_CLI_C)
int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl,
mbedtls_ssl_session *dst )
{
int ret;
if( ssl == NULL ||
dst == NULL ||
ssl->session == NULL ||
ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
/* Since Mbed TLS 3.0, mbedtls_ssl_get_session() is no longer
* idempotent: Each session can only be exported once.
*
* (This is in preparation for TLS 1.3 support where we will
* need the ability to export multiple sessions (aka tickets),
* which will be achieved by calling mbedtls_ssl_get_session()
* multiple times until it fails.)
*
* Check whether we have already exported the current session,
* and fail if so.
*/
if( ssl->session->exported == 1 )
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
ret = mbedtls_ssl_session_copy( dst, ssl->session );
if( ret != 0 )
return( ret );
/* Remember that we've exported the session. */
ssl->session->exported = 1;
return( 0 );
}
#endif /* MBEDTLS_SSL_CLI_C */
/*
* Define ticket header determining Mbed TLS version
* and structure of the ticket.
*/
/*
* Define bitflag determining compile-time settings influencing
* structure of serialized SSL sessions.
*/
#if defined(MBEDTLS_HAVE_TIME)
#define SSL_SERIALIZED_SESSION_CONFIG_TIME 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_TIME 0
#endif /* MBEDTLS_HAVE_TIME */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#define SSL_SERIALIZED_SESSION_CONFIG_CRT 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_CRT 0
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_CLI_C) && defined(MBEDTLS_SSL_SESSION_TICKETS)
#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 0
#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_SESSION_TICKETS */
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
#define SSL_SERIALIZED_SESSION_CONFIG_MFL 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_MFL 0
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
#define SSL_SERIALIZED_SESSION_CONFIG_ETM 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_ETM 0
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 0
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
#define SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT 0
#define SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT 1
#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT 2
#define SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT 3
#define SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT 4
#define SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT 5
#define SSL_SERIALIZED_SESSION_CONFIG_BITFLAG \
( (uint16_t) ( \
( SSL_SERIALIZED_SESSION_CONFIG_TIME << SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_CRT << SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET << SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_MFL << SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_ETM << SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT ) | \
( SSL_SERIALIZED_SESSION_CONFIG_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT ) ) )
static unsigned char ssl_serialized_session_header[] = {
MBEDTLS_VERSION_MAJOR,
MBEDTLS_VERSION_MINOR,
MBEDTLS_VERSION_PATCH,
MBEDTLS_BYTE_1( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG ),
MBEDTLS_BYTE_0( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG ),
};
/*
* Serialize a session in the following format:
* (in the presentation language of TLS, RFC 8446 section 3)
*
* struct {
*
* opaque mbedtls_version[3]; // library version: major, minor, patch
* opaque session_format[2]; // library-version specific 16-bit field
* // determining the format of the remaining
* // serialized data.
*
* Note: When updating the format, remember to keep
* these version+format bytes.
*
* // In this version, `session_format` determines
* // the setting of those compile-time
* // configuration options which influence
* // the structure of mbedtls_ssl_session.
*
* uint8_t minor_ver; // Protocol minor version. Possible values:
* // - TLS 1.2 (3)
*
* select (serialized_session.tls_version) {
*
* case MBEDTLS_SSL_VERSION_TLS1_2:
* serialized_session_tls12 data;
*
* };
*
* } serialized_session;
*
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_session_save( const mbedtls_ssl_session *session,
unsigned char omit_header,
unsigned char *buf,
size_t buf_len,
size_t *olen )
{
unsigned char *p = buf;
size_t used = 0;
if( !omit_header )
{
/*
* Add Mbed TLS version identifier
*/
used += sizeof( ssl_serialized_session_header );
if( used <= buf_len )
{
memcpy( p, ssl_serialized_session_header,
sizeof( ssl_serialized_session_header ) );
p += sizeof( ssl_serialized_session_header );
}
}
/*
* TLS version identifier
*/
used += 1;
if( used <= buf_len )
{
*p++ = MBEDTLS_BYTE_0( session->tls_version );
}
/* Forward to version-specific serialization routine. */
switch( session->tls_version )
{
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
case MBEDTLS_SSL_VERSION_TLS1_2:
{
size_t remaining_len = used <= buf_len ? buf_len - used : 0;
used += ssl_session_save_tls12( session, p, remaining_len );
break;
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
default:
return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
}
*olen = used;
if( used > buf_len )
return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
return( 0 );
}
/*
* Public wrapper for ssl_session_save()
*/
int mbedtls_ssl_session_save( const mbedtls_ssl_session *session,
unsigned char *buf,
size_t buf_len,
size_t *olen )
{
return( ssl_session_save( session, 0, buf, buf_len, olen ) );
}
/*
* Deserialize session, see mbedtls_ssl_session_save() for format.
*
* This internal version is wrapped by a public function that cleans up in
* case of error, and has an extra option omit_header.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_session_load( mbedtls_ssl_session *session,
unsigned char omit_header,
const unsigned char *buf,
size_t len )
{
const unsigned char *p = buf;
const unsigned char * const end = buf + len;
if( !omit_header )
{
/*
* Check Mbed TLS version identifier
*/
if( (size_t)( end - p ) < sizeof( ssl_serialized_session_header ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( memcmp( p, ssl_serialized_session_header,
sizeof( ssl_serialized_session_header ) ) != 0 )
{
return( MBEDTLS_ERR_SSL_VERSION_MISMATCH );
}
p += sizeof( ssl_serialized_session_header );
}
/*
* TLS version identifier
*/
if( 1 > (size_t)( end - p ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
session->tls_version = 0x0300 | *p++;
/* Dispatch according to TLS version. */
switch( session->tls_version )
{
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
case MBEDTLS_SSL_VERSION_TLS1_2:
{
size_t remaining_len = ( end - p );
return( ssl_session_load_tls12( session, p, remaining_len ) );
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
default:
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
}
/*
* Deserialize session: public wrapper for error cleaning
*/
int mbedtls_ssl_session_load( mbedtls_ssl_session *session,
const unsigned char *buf,
size_t len )
{
int ret = ssl_session_load( session, 0, buf, len );
if( ret != 0 )
mbedtls_ssl_session_free( session );
return( ret );
}
/*
* Perform a single step of the SSL handshake
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_prepare_handshake_step( mbedtls_ssl_context *ssl )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/*
* We may have not been able to send to the peer all the handshake data
* that were written into the output buffer by the previous handshake step,
* if the write to the network callback returned with the
* #MBEDTLS_ERR_SSL_WANT_WRITE error code.
* We proceed to the next handshake step only when all data from the
* previous one have been sent to the peer, thus we make sure that this is
* the case here by calling `mbedtls_ssl_flush_output()`. The function may
* return with the #MBEDTLS_ERR_SSL_WANT_WRITE error code in which case
* we have to wait before to go ahead.
* In the case of TLS 1.3, handshake step handlers do not send data to the
* peer. Data are only sent here and through
* `mbedtls_ssl_handle_pending_alert` in case an error that triggered an
* alert occurred.
*/
if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
return( ret );
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
{
if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
return( ret );
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
return( ret );
}
int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if( ssl == NULL ||
ssl->conf == NULL ||
ssl->handshake == NULL ||
mbedtls_ssl_is_handshake_over( ssl ) == 1 )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
ret = ssl_prepare_handshake_step( ssl );
if( ret != 0 )
return( ret );
ret = mbedtls_ssl_handle_pending_alert( ssl );
if( ret != 0 )
goto cleanup;
#if defined(MBEDTLS_SSL_CLI_C)
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "client state: %s",
mbedtls_ssl_states_str( ssl->state ) ) );
switch( ssl->state )
{
case MBEDTLS_SSL_HELLO_REQUEST:
ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
break;
case MBEDTLS_SSL_CLIENT_HELLO:
ret = mbedtls_ssl_write_client_hello( ssl );
break;
default:
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && defined(MBEDTLS_SSL_PROTO_TLS1_3)
if( ssl->tls_version == MBEDTLS_SSL_VERSION_TLS1_3 )
ret = mbedtls_ssl_tls13_handshake_client_step( ssl );
else
ret = mbedtls_ssl_handshake_client_step( ssl );
#elif defined(MBEDTLS_SSL_PROTO_TLS1_2)
ret = mbedtls_ssl_handshake_client_step( ssl );
#else
ret = mbedtls_ssl_tls13_handshake_client_step( ssl );
#endif
}
}
#endif
#if defined(MBEDTLS_SSL_SRV_C)
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
{
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
if( mbedtls_ssl_conf_is_tls13_only( ssl->conf ) )
ret = mbedtls_ssl_tls13_handshake_server_step( ssl );
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( mbedtls_ssl_conf_is_tls12_only( ssl->conf ) )
ret = mbedtls_ssl_handshake_server_step( ssl );
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
}
#endif
if( ret != 0 )
{
/* handshake_step return error. And it is same
* with alert_reason.
*/
if( ssl->send_alert )
{
ret = mbedtls_ssl_handle_pending_alert( ssl );
goto cleanup;
}
}
cleanup:
return( ret );
}
/*
* Perform the SSL handshake
*/
int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl )
{
int ret = 0;
/* Sanity checks */
if( ssl == NULL || ssl->conf == NULL )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL ) )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use "
"mbedtls_ssl_set_timer_cb() for DTLS" ) );
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
/* Main handshake loop */
while( mbedtls_ssl_is_handshake_over( ssl ) == 0 )
{
ret = mbedtls_ssl_handshake_step( ssl );
if( ret != 0 )
break;
}
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
return( ret );
}
#if defined(MBEDTLS_SSL_RENEGOTIATION)
#if defined(MBEDTLS_SSL_SRV_C)
/*
* Write HelloRequest to request renegotiation on server
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_hello_request( mbedtls_ssl_context *ssl )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) );
ssl->out_msglen = 4;
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST;
if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
return( ret );
}
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) );
return( 0 );
}
#endif /* MBEDTLS_SSL_SRV_C */
/*
* Actually renegotiate current connection, triggered by either:
* - any side: calling mbedtls_ssl_renegotiate(),
* - client: receiving a HelloRequest during mbedtls_ssl_read(),
* - server: receiving any handshake message on server during mbedtls_ssl_read() after
* the initial handshake is completed.
* If the handshake doesn't complete due to waiting for I/O, it will continue
* during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively.
*/
int mbedtls_ssl_start_renegotiation( mbedtls_ssl_context *ssl )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) );
if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
return( ret );
/* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and
* the ServerHello will have message_seq = 1" */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
{
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
ssl->handshake->out_msg_seq = 1;
else
ssl->handshake->in_msg_seq = 1;
}
#endif
ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS;
if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
return( ret );
}
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) );
return( 0 );
}
/*
* Renegotiate current connection on client,
* or request renegotiation on server
*/
int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl )
{
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
if( ssl == NULL || ssl->conf == NULL )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
#if defined(MBEDTLS_SSL_SRV_C)
/* On server, just send the request */
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
{
if( mbedtls_ssl_is_handshake_over( ssl ) == 0 )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
/* Did we already try/start sending HelloRequest? */
if( ssl->out_left != 0 )
return( mbedtls_ssl_flush_output( ssl ) );
return( ssl_write_hello_request( ssl ) );
}
#endif /* MBEDTLS_SSL_SRV_C */
#if defined(MBEDTLS_SSL_CLI_C)
/*
* On client, either start the renegotiation process or,
* if already in progress, continue the handshake
*/
if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )