2 * SSLv3/TLSv1 shared functions
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
19 * This file is part of mbed TLS (https://tls.mbed.org)
22 * The SSL 3.0 specification was drafted by Netscape in 1996,
23 * and became an IETF standard in 1999.
25 * http://wp.netscape.com/eng/ssl3/
26 * http://www.ietf.org/rfc/rfc2246.txt
27 * http://www.ietf.org/rfc/rfc4346.txt
30 #if !defined(MBEDTLS_CONFIG_FILE)
31 #include "mbedtls/config.h"
33 #include MBEDTLS_CONFIG_FILE
36 #if defined(MBEDTLS_SSL_TLS_C)
38 #if defined(MBEDTLS_PLATFORM_C)
39 #include "mbedtls/platform.h"
42 #define mbedtls_calloc calloc
43 #define mbedtls_free free
46 #include "mbedtls/debug.h"
47 #include "mbedtls/ssl.h"
48 #include "mbedtls/ssl_internal.h"
52 #if defined(MBEDTLS_X509_CRT_PARSE_C)
53 #include "mbedtls/oid.h"
56 /* Implementation that should never be optimized out by the compiler */
57 static void mbedtls_zeroize( void *v, size_t n ) {
58 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
61 /* Length of the "epoch" field in the record header */
62 static inline size_t ssl_ep_len( const mbedtls_ssl_context *ssl )
64 #if defined(MBEDTLS_SSL_PROTO_DTLS)
65 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
75 * Passing millisecs = 0 cancels a running timer.
77 static void ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs )
79 if( ssl->f_set_timer == NULL )
82 MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) );
83 ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs );
87 * Return -1 is timer is expired, 0 if it isn't.
89 static int ssl_check_timer( mbedtls_ssl_context *ssl )
91 if( ssl->f_get_timer == NULL )
94 if( ssl->f_get_timer( ssl->p_timer ) == 2 )
96 MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) );
103 #if defined(MBEDTLS_SSL_PROTO_DTLS)
105 * Double the retransmit timeout value, within the allowed range,
106 * returning -1 if the maximum value has already been reached.
108 static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl )
110 uint32_t new_timeout;
112 if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max )
115 new_timeout = 2 * ssl->handshake->retransmit_timeout;
117 /* Avoid arithmetic overflow and range overflow */
118 if( new_timeout < ssl->handshake->retransmit_timeout ||
119 new_timeout > ssl->conf->hs_timeout_max )
121 new_timeout = ssl->conf->hs_timeout_max;
124 ssl->handshake->retransmit_timeout = new_timeout;
125 MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
126 ssl->handshake->retransmit_timeout ) );
131 static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl )
133 ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min;
134 MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
135 ssl->handshake->retransmit_timeout ) );
137 #endif /* MBEDTLS_SSL_PROTO_DTLS */
139 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
141 * Convert max_fragment_length codes to length.
144 * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
145 * } MaxFragmentLength;
146 * and we add 0 -> extension unused
148 static unsigned int mfl_code_to_length[MBEDTLS_SSL_MAX_FRAG_LEN_INVALID] =
150 MBEDTLS_SSL_MAX_CONTENT_LEN, /* MBEDTLS_SSL_MAX_FRAG_LEN_NONE */
151 512, /* MBEDTLS_SSL_MAX_FRAG_LEN_512 */
152 1024, /* MBEDTLS_SSL_MAX_FRAG_LEN_1024 */
153 2048, /* MBEDTLS_SSL_MAX_FRAG_LEN_2048 */
154 4096, /* MBEDTLS_SSL_MAX_FRAG_LEN_4096 */
156 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
158 #if defined(MBEDTLS_SSL_CLI_C)
159 static int ssl_session_copy( mbedtls_ssl_session *dst, const mbedtls_ssl_session *src )
161 mbedtls_ssl_session_free( dst );
162 memcpy( dst, src, sizeof( mbedtls_ssl_session ) );
164 #if defined(MBEDTLS_X509_CRT_PARSE_C)
165 if( src->peer_cert != NULL )
169 dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) );
170 if( dst->peer_cert == NULL )
171 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
173 mbedtls_x509_crt_init( dst->peer_cert );
175 if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p,
176 src->peer_cert->raw.len ) ) != 0 )
178 mbedtls_free( dst->peer_cert );
179 dst->peer_cert = NULL;
183 #endif /* MBEDTLS_X509_CRT_PARSE_C */
185 #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
186 if( src->ticket != NULL )
188 dst->ticket = mbedtls_calloc( 1, src->ticket_len );
189 if( dst->ticket == NULL )
190 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
192 memcpy( dst->ticket, src->ticket, src->ticket_len );
194 #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
198 #endif /* MBEDTLS_SSL_CLI_C */
200 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
201 int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl,
202 const unsigned char *key_enc, const unsigned char *key_dec,
204 const unsigned char *iv_enc, const unsigned char *iv_dec,
206 const unsigned char *mac_enc, const unsigned char *mac_dec,
207 size_t maclen ) = NULL;
208 int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL;
209 int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL;
210 int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL;
211 int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL;
212 int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL;
213 #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
216 * Key material generation
218 #if defined(MBEDTLS_SSL_PROTO_SSL3)
219 static int ssl3_prf( const unsigned char *secret, size_t slen,
221 const unsigned char *random, size_t rlen,
222 unsigned char *dstbuf, size_t dlen )
225 mbedtls_md5_context md5;
226 mbedtls_sha1_context sha1;
227 unsigned char padding[16];
228 unsigned char sha1sum[20];
231 mbedtls_md5_init( &md5 );
232 mbedtls_sha1_init( &sha1 );
237 * MD5( secret + SHA1( 'A' + secret + random ) ) +
238 * MD5( secret + SHA1( 'BB' + secret + random ) ) +
239 * MD5( secret + SHA1( 'CCC' + secret + random ) ) +
242 for( i = 0; i < dlen / 16; i++ )
244 memset( padding, (unsigned char) ('A' + i), 1 + i );
246 mbedtls_sha1_starts( &sha1 );
247 mbedtls_sha1_update( &sha1, padding, 1 + i );
248 mbedtls_sha1_update( &sha1, secret, slen );
249 mbedtls_sha1_update( &sha1, random, rlen );
250 mbedtls_sha1_finish( &sha1, sha1sum );
252 mbedtls_md5_starts( &md5 );
253 mbedtls_md5_update( &md5, secret, slen );
254 mbedtls_md5_update( &md5, sha1sum, 20 );
255 mbedtls_md5_finish( &md5, dstbuf + i * 16 );
258 mbedtls_md5_free( &md5 );
259 mbedtls_sha1_free( &sha1 );
261 mbedtls_zeroize( padding, sizeof( padding ) );
262 mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
266 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
268 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
269 static int tls1_prf( const unsigned char *secret, size_t slen,
271 const unsigned char *random, size_t rlen,
272 unsigned char *dstbuf, size_t dlen )
276 const unsigned char *S1, *S2;
277 unsigned char tmp[128];
278 unsigned char h_i[20];
279 const mbedtls_md_info_t *md_info;
280 mbedtls_md_context_t md_ctx;
283 mbedtls_md_init( &md_ctx );
285 if( sizeof( tmp ) < 20 + strlen( label ) + rlen )
286 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
288 hs = ( slen + 1 ) / 2;
290 S2 = secret + slen - hs;
292 nb = strlen( label );
293 memcpy( tmp + 20, label, nb );
294 memcpy( tmp + 20 + nb, random, rlen );
298 * First compute P_md5(secret,label+random)[0..dlen]
300 if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL )
301 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
303 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
306 mbedtls_md_hmac_starts( &md_ctx, S1, hs );
307 mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
308 mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
310 for( i = 0; i < dlen; i += 16 )
312 mbedtls_md_hmac_reset ( &md_ctx );
313 mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb );
314 mbedtls_md_hmac_finish( &md_ctx, h_i );
316 mbedtls_md_hmac_reset ( &md_ctx );
317 mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 );
318 mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
320 k = ( i + 16 > dlen ) ? dlen % 16 : 16;
322 for( j = 0; j < k; j++ )
323 dstbuf[i + j] = h_i[j];
326 mbedtls_md_free( &md_ctx );
329 * XOR out with P_sha1(secret,label+random)[0..dlen]
331 if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL )
332 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
334 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
337 mbedtls_md_hmac_starts( &md_ctx, S2, hs );
338 mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
339 mbedtls_md_hmac_finish( &md_ctx, tmp );
341 for( i = 0; i < dlen; i += 20 )
343 mbedtls_md_hmac_reset ( &md_ctx );
344 mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb );
345 mbedtls_md_hmac_finish( &md_ctx, h_i );
347 mbedtls_md_hmac_reset ( &md_ctx );
348 mbedtls_md_hmac_update( &md_ctx, tmp, 20 );
349 mbedtls_md_hmac_finish( &md_ctx, tmp );
351 k = ( i + 20 > dlen ) ? dlen % 20 : 20;
353 for( j = 0; j < k; j++ )
354 dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] );
357 mbedtls_md_free( &md_ctx );
359 mbedtls_zeroize( tmp, sizeof( tmp ) );
360 mbedtls_zeroize( h_i, sizeof( h_i ) );
364 #endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */
366 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
367 static int tls_prf_generic( mbedtls_md_type_t md_type,
368 const unsigned char *secret, size_t slen,
370 const unsigned char *random, size_t rlen,
371 unsigned char *dstbuf, size_t dlen )
374 size_t i, j, k, md_len;
375 unsigned char tmp[128];
376 unsigned char h_i[MBEDTLS_MD_MAX_SIZE];
377 const mbedtls_md_info_t *md_info;
378 mbedtls_md_context_t md_ctx;
381 mbedtls_md_init( &md_ctx );
383 if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL )
384 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
386 md_len = mbedtls_md_get_size( md_info );
388 if( sizeof( tmp ) < md_len + strlen( label ) + rlen )
389 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
391 nb = strlen( label );
392 memcpy( tmp + md_len, label, nb );
393 memcpy( tmp + md_len + nb, random, rlen );
397 * Compute P_<hash>(secret, label + random)[0..dlen]
399 if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
402 mbedtls_md_hmac_starts( &md_ctx, secret, slen );
403 mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb );
404 mbedtls_md_hmac_finish( &md_ctx, tmp );
406 for( i = 0; i < dlen; i += md_len )
408 mbedtls_md_hmac_reset ( &md_ctx );
409 mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb );
410 mbedtls_md_hmac_finish( &md_ctx, h_i );
412 mbedtls_md_hmac_reset ( &md_ctx );
413 mbedtls_md_hmac_update( &md_ctx, tmp, md_len );
414 mbedtls_md_hmac_finish( &md_ctx, tmp );
416 k = ( i + md_len > dlen ) ? dlen % md_len : md_len;
418 for( j = 0; j < k; j++ )
419 dstbuf[i + j] = h_i[j];
422 mbedtls_md_free( &md_ctx );
424 mbedtls_zeroize( tmp, sizeof( tmp ) );
425 mbedtls_zeroize( h_i, sizeof( h_i ) );
430 #if defined(MBEDTLS_SHA256_C)
431 static int tls_prf_sha256( const unsigned char *secret, size_t slen,
433 const unsigned char *random, size_t rlen,
434 unsigned char *dstbuf, size_t dlen )
436 return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen,
437 label, random, rlen, dstbuf, dlen ) );
439 #endif /* MBEDTLS_SHA256_C */
441 #if defined(MBEDTLS_SHA512_C)
442 static int tls_prf_sha384( const unsigned char *secret, size_t slen,
444 const unsigned char *random, size_t rlen,
445 unsigned char *dstbuf, size_t dlen )
447 return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen,
448 label, random, rlen, dstbuf, dlen ) );
450 #endif /* MBEDTLS_SHA512_C */
451 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
453 static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t );
455 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
456 defined(MBEDTLS_SSL_PROTO_TLS1_1)
457 static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t );
460 #if defined(MBEDTLS_SSL_PROTO_SSL3)
461 static void ssl_calc_verify_ssl( mbedtls_ssl_context *, unsigned char * );
462 static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int );
465 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
466 static void ssl_calc_verify_tls( mbedtls_ssl_context *, unsigned char * );
467 static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int );
470 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
471 #if defined(MBEDTLS_SHA256_C)
472 static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t );
473 static void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *,unsigned char * );
474 static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int );
477 #if defined(MBEDTLS_SHA512_C)
478 static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t );
479 static void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *, unsigned char * );
480 static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int );
482 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
484 int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
487 unsigned char tmp[64];
488 unsigned char keyblk[256];
491 unsigned char *mac_enc;
492 unsigned char *mac_dec;
494 const mbedtls_cipher_info_t *cipher_info;
495 const mbedtls_md_info_t *md_info;
497 mbedtls_ssl_session *session = ssl->session_negotiate;
498 mbedtls_ssl_transform *transform = ssl->transform_negotiate;
499 mbedtls_ssl_handshake_params *handshake = ssl->handshake;
501 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
503 cipher_info = mbedtls_cipher_info_from_type( transform->ciphersuite_info->cipher );
504 if( cipher_info == NULL )
506 MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found",
507 transform->ciphersuite_info->cipher ) );
508 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
511 md_info = mbedtls_md_info_from_type( transform->ciphersuite_info->mac );
512 if( md_info == NULL )
514 MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found",
515 transform->ciphersuite_info->mac ) );
516 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
520 * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions
522 #if defined(MBEDTLS_SSL_PROTO_SSL3)
523 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
525 handshake->tls_prf = ssl3_prf;
526 handshake->calc_verify = ssl_calc_verify_ssl;
527 handshake->calc_finished = ssl_calc_finished_ssl;
531 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
532 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
534 handshake->tls_prf = tls1_prf;
535 handshake->calc_verify = ssl_calc_verify_tls;
536 handshake->calc_finished = ssl_calc_finished_tls;
540 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
541 #if defined(MBEDTLS_SHA512_C)
542 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
543 transform->ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
545 handshake->tls_prf = tls_prf_sha384;
546 handshake->calc_verify = ssl_calc_verify_tls_sha384;
547 handshake->calc_finished = ssl_calc_finished_tls_sha384;
551 #if defined(MBEDTLS_SHA256_C)
552 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
554 handshake->tls_prf = tls_prf_sha256;
555 handshake->calc_verify = ssl_calc_verify_tls_sha256;
556 handshake->calc_finished = ssl_calc_finished_tls_sha256;
560 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
562 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
563 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
569 * MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) +
570 * MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) +
571 * MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) )
574 * master = PRF( premaster, "master secret", randbytes )[0..47]
576 if( handshake->resume == 0 )
578 MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster,
581 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
582 if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
584 unsigned char session_hash[48];
587 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
589 ssl->handshake->calc_verify( ssl, session_hash );
591 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
592 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
594 #if defined(MBEDTLS_SHA512_C)
595 if( ssl->transform_negotiate->ciphersuite_info->mac ==
605 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
608 MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
610 ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
611 "extended master secret",
612 session_hash, hash_len,
613 session->master, 48 );
616 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
623 ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
625 handshake->randbytes, 64,
626 session->master, 48 );
629 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
633 mbedtls_zeroize( handshake->premaster, sizeof(handshake->premaster) );
636 MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
639 * Swap the client and server random values.
641 memcpy( tmp, handshake->randbytes, 64 );
642 memcpy( handshake->randbytes, tmp + 32, 32 );
643 memcpy( handshake->randbytes + 32, tmp, 32 );
644 mbedtls_zeroize( tmp, sizeof( tmp ) );
649 * MD5( master + SHA1( 'A' + master + randbytes ) ) +
650 * MD5( master + SHA1( 'BB' + master + randbytes ) ) +
651 * MD5( master + SHA1( 'CCC' + master + randbytes ) ) +
652 * MD5( master + SHA1( 'DDDD' + master + randbytes ) ) +
656 * key block = PRF( master, "key expansion", randbytes )
658 ret = handshake->tls_prf( session->master, 48, "key expansion",
659 handshake->randbytes, 64, keyblk, 256 );
662 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
666 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s",
667 mbedtls_ssl_get_ciphersuite_name( session->ciphersuite ) ) );
668 MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", session->master, 48 );
669 MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 );
670 MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
672 mbedtls_zeroize( handshake->randbytes, sizeof( handshake->randbytes ) );
675 * Determine the appropriate key, IV and MAC length.
678 transform->keylen = cipher_info->key_bitlen / 8;
680 if( cipher_info->mode == MBEDTLS_MODE_GCM ||
681 cipher_info->mode == MBEDTLS_MODE_CCM )
683 transform->maclen = 0;
685 transform->ivlen = 12;
686 transform->fixed_ivlen = 4;
688 /* Minimum length is expicit IV + tag */
689 transform->minlen = transform->ivlen - transform->fixed_ivlen
690 + ( transform->ciphersuite_info->flags &
691 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16 );
695 /* Initialize HMAC contexts */
696 if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 ||
697 ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 )
699 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
704 transform->maclen = mbedtls_md_get_size( md_info );
706 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
708 * If HMAC is to be truncated, we shall keep the leftmost bytes,
709 * (rfc 6066 page 13 or rfc 2104 section 4),
710 * so we only need to adjust the length here.
712 if( session->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
713 transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
714 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
717 transform->ivlen = cipher_info->iv_size;
720 if( cipher_info->mode == MBEDTLS_MODE_STREAM )
721 transform->minlen = transform->maclen;
725 * GenericBlockCipher:
726 * 1. if EtM is in use: one block plus MAC
727 * otherwise: * first multiple of blocklen greater than maclen
728 * 2. IV except for SSL3 and TLS 1.0
730 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
731 if( session->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
733 transform->minlen = transform->maclen
734 + cipher_info->block_size;
739 transform->minlen = transform->maclen
740 + cipher_info->block_size
741 - transform->maclen % cipher_info->block_size;
744 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
745 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
746 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 )
747 ; /* No need to adjust minlen */
750 #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
751 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 ||
752 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
754 transform->minlen += transform->ivlen;
759 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
760 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
765 MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d",
766 transform->keylen, transform->minlen, transform->ivlen,
767 transform->maclen ) );
770 * Finally setup the cipher contexts, IVs and MAC secrets.
772 #if defined(MBEDTLS_SSL_CLI_C)
773 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
775 key1 = keyblk + transform->maclen * 2;
776 key2 = keyblk + transform->maclen * 2 + transform->keylen;
779 mac_dec = keyblk + transform->maclen;
782 * This is not used in TLS v1.1.
784 iv_copy_len = ( transform->fixed_ivlen ) ?
785 transform->fixed_ivlen : transform->ivlen;
786 memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len );
787 memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len,
791 #endif /* MBEDTLS_SSL_CLI_C */
792 #if defined(MBEDTLS_SSL_SRV_C)
793 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
795 key1 = keyblk + transform->maclen * 2 + transform->keylen;
796 key2 = keyblk + transform->maclen * 2;
798 mac_enc = keyblk + transform->maclen;
802 * This is not used in TLS v1.1.
804 iv_copy_len = ( transform->fixed_ivlen ) ?
805 transform->fixed_ivlen : transform->ivlen;
806 memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len );
807 memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len,
811 #endif /* MBEDTLS_SSL_SRV_C */
813 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
814 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
817 #if defined(MBEDTLS_SSL_PROTO_SSL3)
818 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
820 if( transform->maclen > sizeof transform->mac_enc )
822 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
823 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
826 memcpy( transform->mac_enc, mac_enc, transform->maclen );
827 memcpy( transform->mac_dec, mac_dec, transform->maclen );
830 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
831 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
832 defined(MBEDTLS_SSL_PROTO_TLS1_2)
833 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
835 mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, transform->maclen );
836 mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, transform->maclen );
841 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
842 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
845 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
846 if( mbedtls_ssl_hw_record_init != NULL )
850 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) );
852 if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, transform->keylen,
853 transform->iv_enc, transform->iv_dec,
856 transform->maclen ) ) != 0 )
858 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret );
859 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
862 #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
864 #if defined(MBEDTLS_SSL_EXPORT_KEYS)
865 if( ssl->conf->f_export_keys != NULL )
867 ssl->conf->f_export_keys( ssl->conf->p_export_keys,
868 session->master, keyblk,
869 transform->maclen, transform->keylen,
874 if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc,
875 cipher_info ) ) != 0 )
877 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
881 if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec,
882 cipher_info ) ) != 0 )
884 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
888 if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1,
889 cipher_info->key_bitlen,
890 MBEDTLS_ENCRYPT ) ) != 0 )
892 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
896 if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2,
897 cipher_info->key_bitlen,
898 MBEDTLS_DECRYPT ) ) != 0 )
900 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
904 #if defined(MBEDTLS_CIPHER_MODE_CBC)
905 if( cipher_info->mode == MBEDTLS_MODE_CBC )
907 if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc,
908 MBEDTLS_PADDING_NONE ) ) != 0 )
910 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
914 if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec,
915 MBEDTLS_PADDING_NONE ) ) != 0 )
917 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
921 #endif /* MBEDTLS_CIPHER_MODE_CBC */
923 mbedtls_zeroize( keyblk, sizeof( keyblk ) );
925 #if defined(MBEDTLS_ZLIB_SUPPORT)
926 // Initialize compression
928 if( session->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
930 if( ssl->compress_buf == NULL )
932 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
933 ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_BUFFER_LEN );
934 if( ssl->compress_buf == NULL )
936 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
937 MBEDTLS_SSL_BUFFER_LEN ) );
938 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
942 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
944 memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) );
945 memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) );
947 if( deflateInit( &transform->ctx_deflate,
948 Z_DEFAULT_COMPRESSION ) != Z_OK ||
949 inflateInit( &transform->ctx_inflate ) != Z_OK )
951 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) );
952 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
955 #endif /* MBEDTLS_ZLIB_SUPPORT */
957 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
962 #if defined(MBEDTLS_SSL_PROTO_SSL3)
963 void ssl_calc_verify_ssl( mbedtls_ssl_context *ssl, unsigned char hash[36] )
965 mbedtls_md5_context md5;
966 mbedtls_sha1_context sha1;
967 unsigned char pad_1[48];
968 unsigned char pad_2[48];
970 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) );
972 mbedtls_md5_init( &md5 );
973 mbedtls_sha1_init( &sha1 );
975 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
976 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
978 memset( pad_1, 0x36, 48 );
979 memset( pad_2, 0x5C, 48 );
981 mbedtls_md5_update( &md5, ssl->session_negotiate->master, 48 );
982 mbedtls_md5_update( &md5, pad_1, 48 );
983 mbedtls_md5_finish( &md5, hash );
985 mbedtls_md5_starts( &md5 );
986 mbedtls_md5_update( &md5, ssl->session_negotiate->master, 48 );
987 mbedtls_md5_update( &md5, pad_2, 48 );
988 mbedtls_md5_update( &md5, hash, 16 );
989 mbedtls_md5_finish( &md5, hash );
991 mbedtls_sha1_update( &sha1, ssl->session_negotiate->master, 48 );
992 mbedtls_sha1_update( &sha1, pad_1, 40 );
993 mbedtls_sha1_finish( &sha1, hash + 16 );
995 mbedtls_sha1_starts( &sha1 );
996 mbedtls_sha1_update( &sha1, ssl->session_negotiate->master, 48 );
997 mbedtls_sha1_update( &sha1, pad_2, 40 );
998 mbedtls_sha1_update( &sha1, hash + 16, 20 );
999 mbedtls_sha1_finish( &sha1, hash + 16 );
1001 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
1002 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
1004 mbedtls_md5_free( &md5 );
1005 mbedtls_sha1_free( &sha1 );
1009 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
1011 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
1012 void ssl_calc_verify_tls( mbedtls_ssl_context *ssl, unsigned char hash[36] )
1014 mbedtls_md5_context md5;
1015 mbedtls_sha1_context sha1;
1017 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) );
1019 mbedtls_md5_init( &md5 );
1020 mbedtls_sha1_init( &sha1 );
1022 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
1023 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
1025 mbedtls_md5_finish( &md5, hash );
1026 mbedtls_sha1_finish( &sha1, hash + 16 );
1028 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
1029 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
1031 mbedtls_md5_free( &md5 );
1032 mbedtls_sha1_free( &sha1 );
1036 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
1038 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
1039 #if defined(MBEDTLS_SHA256_C)
1040 void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *ssl, unsigned char hash[32] )
1042 mbedtls_sha256_context sha256;
1044 mbedtls_sha256_init( &sha256 );
1046 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) );
1048 mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
1049 mbedtls_sha256_finish( &sha256, hash );
1051 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 );
1052 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
1054 mbedtls_sha256_free( &sha256 );
1058 #endif /* MBEDTLS_SHA256_C */
1060 #if defined(MBEDTLS_SHA512_C)
1061 void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *ssl, unsigned char hash[48] )
1063 mbedtls_sha512_context sha512;
1065 mbedtls_sha512_init( &sha512 );
1067 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) );
1069 mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
1070 mbedtls_sha512_finish( &sha512, hash );
1072 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 );
1073 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
1075 mbedtls_sha512_free( &sha512 );
1079 #endif /* MBEDTLS_SHA512_C */
1080 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
1082 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
1083 int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex )
1085 unsigned char *p = ssl->handshake->premaster;
1086 unsigned char *end = p + sizeof( ssl->handshake->premaster );
1087 const unsigned char *psk = ssl->conf->psk;
1088 size_t psk_len = ssl->conf->psk_len;
1090 /* If the psk callback was called, use its result */
1091 if( ssl->handshake->psk != NULL )
1093 psk = ssl->handshake->psk;
1094 psk_len = ssl->handshake->psk_len;
1099 * opaque other_secret<0..2^16-1>;
1100 * opaque psk<0..2^16-1>;
1102 * with "other_secret" depending on the particular key exchange
1104 #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
1105 if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK )
1108 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1110 *(p++) = (unsigned char)( psk_len >> 8 );
1111 *(p++) = (unsigned char)( psk_len );
1113 if( end < p || (size_t)( end - p ) < psk_len )
1114 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1116 memset( p, 0, psk_len );
1120 #endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
1121 #if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
1122 if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
1125 * other_secret already set by the ClientKeyExchange message,
1126 * and is 48 bytes long
1133 #endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
1134 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
1135 if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
1140 /* Write length only when we know the actual value */
1141 if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
1142 p + 2, end - ( p + 2 ), &len,
1143 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
1145 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
1148 *(p++) = (unsigned char)( len >> 8 );
1149 *(p++) = (unsigned char)( len );
1152 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
1155 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
1156 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
1157 if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
1162 if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
1163 p + 2, end - ( p + 2 ),
1164 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
1166 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
1170 *(p++) = (unsigned char)( zlen >> 8 );
1171 *(p++) = (unsigned char)( zlen );
1174 MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
1177 #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
1179 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1180 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1183 /* opaque psk<0..2^16-1>; */
1185 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1187 *(p++) = (unsigned char)( psk_len >> 8 );
1188 *(p++) = (unsigned char)( psk_len );
1190 if( end < p || (size_t)( end - p ) < psk_len )
1191 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1193 memcpy( p, psk, psk_len );
1196 ssl->handshake->pmslen = p - ssl->handshake->premaster;
1200 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
1202 #if defined(MBEDTLS_SSL_PROTO_SSL3)
1204 * SSLv3.0 MAC functions
1206 static void ssl_mac( mbedtls_md_context_t *md_ctx, unsigned char *secret,
1207 unsigned char *buf, size_t len,
1208 unsigned char *ctr, int type )
1210 unsigned char header[11];
1211 unsigned char padding[48];
1213 int md_size = mbedtls_md_get_size( md_ctx->md_info );
1214 int md_type = mbedtls_md_get_type( md_ctx->md_info );
1216 /* Only MD5 and SHA-1 supported */
1217 if( md_type == MBEDTLS_MD_MD5 )
1222 memcpy( header, ctr, 8 );
1223 header[ 8] = (unsigned char) type;
1224 header[ 9] = (unsigned char)( len >> 8 );
1225 header[10] = (unsigned char)( len );
1227 memset( padding, 0x36, padlen );
1228 mbedtls_md_starts( md_ctx );
1229 mbedtls_md_update( md_ctx, secret, md_size );
1230 mbedtls_md_update( md_ctx, padding, padlen );
1231 mbedtls_md_update( md_ctx, header, 11 );
1232 mbedtls_md_update( md_ctx, buf, len );
1233 mbedtls_md_finish( md_ctx, buf + len );
1235 memset( padding, 0x5C, padlen );
1236 mbedtls_md_starts( md_ctx );
1237 mbedtls_md_update( md_ctx, secret, md_size );
1238 mbedtls_md_update( md_ctx, padding, padlen );
1239 mbedtls_md_update( md_ctx, buf + len, md_size );
1240 mbedtls_md_finish( md_ctx, buf + len );
1242 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
1244 #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) || \
1245 ( defined(MBEDTLS_CIPHER_MODE_CBC) && \
1246 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) ) )
1247 #define SSL_SOME_MODES_USE_MAC
1251 * Encryption/decryption functions
1253 static int ssl_encrypt_buf( mbedtls_ssl_context *ssl )
1255 mbedtls_cipher_mode_t mode;
1258 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) );
1260 if( ssl->session_out == NULL || ssl->transform_out == NULL )
1262 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1263 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1266 mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc );
1268 MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
1269 ssl->out_msg, ssl->out_msglen );
1272 * Add MAC before if needed
1274 #if defined(SSL_SOME_MODES_USE_MAC)
1275 if( mode == MBEDTLS_MODE_STREAM ||
1276 ( mode == MBEDTLS_MODE_CBC
1277 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1278 && ssl->session_out->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED
1282 #if defined(MBEDTLS_SSL_PROTO_SSL3)
1283 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
1285 ssl_mac( &ssl->transform_out->md_ctx_enc,
1286 ssl->transform_out->mac_enc,
1287 ssl->out_msg, ssl->out_msglen,
1288 ssl->out_ctr, ssl->out_msgtype );
1292 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1293 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1294 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
1296 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 8 );
1297 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_hdr, 3 );
1298 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_len, 2 );
1299 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
1300 ssl->out_msg, ssl->out_msglen );
1301 mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc,
1302 ssl->out_msg + ssl->out_msglen );
1303 mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
1308 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1309 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1312 MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac",
1313 ssl->out_msg + ssl->out_msglen,
1314 ssl->transform_out->maclen );
1316 ssl->out_msglen += ssl->transform_out->maclen;
1319 #endif /* AEAD not the only option */
1324 #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
1325 if( mode == MBEDTLS_MODE_STREAM )
1330 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
1331 "including %d bytes of padding",
1332 ssl->out_msglen, 0 ) );
1334 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
1335 ssl->transform_out->iv_enc,
1336 ssl->transform_out->ivlen,
1337 ssl->out_msg, ssl->out_msglen,
1338 ssl->out_msg, &olen ) ) != 0 )
1340 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
1344 if( ssl->out_msglen != olen )
1346 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1347 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1351 #endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
1352 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
1353 if( mode == MBEDTLS_MODE_GCM ||
1354 mode == MBEDTLS_MODE_CCM )
1357 size_t enc_msglen, olen;
1358 unsigned char *enc_msg;
1359 unsigned char add_data[13];
1360 unsigned char taglen = ssl->transform_out->ciphersuite_info->flags &
1361 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
1363 memcpy( add_data, ssl->out_ctr, 8 );
1364 add_data[8] = ssl->out_msgtype;
1365 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
1366 ssl->conf->transport, add_data + 9 );
1367 add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF;
1368 add_data[12] = ssl->out_msglen & 0xFF;
1370 MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
1376 if( ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen != 8 )
1378 /* Reminder if we ever add an AEAD mode with a different size */
1379 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1380 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1383 memcpy( ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen,
1385 memcpy( ssl->out_iv, ssl->out_ctr, 8 );
1387 MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->out_iv,
1388 ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen );
1391 * Fix pointer positions and message length with added IV
1393 enc_msg = ssl->out_msg;
1394 enc_msglen = ssl->out_msglen;
1395 ssl->out_msglen += ssl->transform_out->ivlen -
1396 ssl->transform_out->fixed_ivlen;
1398 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
1399 "including %d bytes of padding",
1400 ssl->out_msglen, 0 ) );
1403 * Encrypt and authenticate
1405 if( ( ret = mbedtls_cipher_auth_encrypt( &ssl->transform_out->cipher_ctx_enc,
1406 ssl->transform_out->iv_enc,
1407 ssl->transform_out->ivlen,
1409 enc_msg, enc_msglen,
1411 enc_msg + enc_msglen, taglen ) ) != 0 )
1413 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_encrypt", ret );
1417 if( olen != enc_msglen )
1419 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1420 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1423 ssl->out_msglen += taglen;
1426 MBEDTLS_SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, taglen );
1429 #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
1430 #if defined(MBEDTLS_CIPHER_MODE_CBC) && \
1431 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
1432 if( mode == MBEDTLS_MODE_CBC )
1435 unsigned char *enc_msg;
1436 size_t enc_msglen, padlen, olen = 0, i;
1438 padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) %
1439 ssl->transform_out->ivlen;
1440 if( padlen == ssl->transform_out->ivlen )
1443 for( i = 0; i <= padlen; i++ )
1444 ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen;
1446 ssl->out_msglen += padlen + 1;
1448 enc_msglen = ssl->out_msglen;
1449 enc_msg = ssl->out_msg;
1451 #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
1453 * Prepend per-record IV for block cipher in TLS v1.1 and up as per
1454 * Method 1 (6.2.3.2. in RFC4346 and RFC5246)
1456 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
1461 ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
1462 ssl->transform_out->ivlen );
1466 memcpy( ssl->out_iv, ssl->transform_out->iv_enc,
1467 ssl->transform_out->ivlen );
1470 * Fix pointer positions and message length with added IV
1472 enc_msg = ssl->out_msg;
1473 enc_msglen = ssl->out_msglen;
1474 ssl->out_msglen += ssl->transform_out->ivlen;
1476 #endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
1478 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
1479 "including %d bytes of IV and %d bytes of padding",
1480 ssl->out_msglen, ssl->transform_out->ivlen,
1483 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
1484 ssl->transform_out->iv_enc,
1485 ssl->transform_out->ivlen,
1486 enc_msg, enc_msglen,
1487 enc_msg, &olen ) ) != 0 )
1489 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
1493 if( enc_msglen != olen )
1495 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1496 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1499 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
1500 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
1503 * Save IV in SSL3 and TLS1
1505 memcpy( ssl->transform_out->iv_enc,
1506 ssl->transform_out->cipher_ctx_enc.iv,
1507 ssl->transform_out->ivlen );
1511 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1512 if( auth_done == 0 )
1515 * MAC(MAC_write_key, seq_num +
1516 * TLSCipherText.type +
1517 * TLSCipherText.version +
1518 * length_of( (IV +) ENC(...) ) +
1519 * IV + // except for TLS 1.0
1520 * ENC(content + padding + padding_length));
1522 unsigned char pseudo_hdr[13];
1524 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
1526 memcpy( pseudo_hdr + 0, ssl->out_ctr, 8 );
1527 memcpy( pseudo_hdr + 8, ssl->out_hdr, 3 );
1528 pseudo_hdr[11] = (unsigned char)( ( ssl->out_msglen >> 8 ) & 0xFF );
1529 pseudo_hdr[12] = (unsigned char)( ( ssl->out_msglen ) & 0xFF );
1531 MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
1533 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, pseudo_hdr, 13 );
1534 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
1535 ssl->out_iv, ssl->out_msglen );
1536 mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc,
1537 ssl->out_iv + ssl->out_msglen );
1538 mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
1540 ssl->out_msglen += ssl->transform_out->maclen;
1543 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
1546 #endif /* MBEDTLS_CIPHER_MODE_CBC &&
1547 ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
1549 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1550 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1553 /* Make extra sure authentication was performed, exactly once */
1554 if( auth_done != 1 )
1556 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1557 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1560 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) );
1565 #define SSL_MAX_MAC_SIZE 48
1567 static int ssl_decrypt_buf( mbedtls_ssl_context *ssl )
1570 mbedtls_cipher_mode_t mode;
1572 #if defined(SSL_SOME_MODES_USE_MAC)
1573 size_t padlen = 0, correct = 1;
1576 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) );
1578 if( ssl->session_in == NULL || ssl->transform_in == NULL )
1580 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1581 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1584 mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_in->cipher_ctx_dec );
1586 if( ssl->in_msglen < ssl->transform_in->minlen )
1588 MBEDTLS_SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)",
1589 ssl->in_msglen, ssl->transform_in->minlen ) );
1590 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1593 #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
1594 if( mode == MBEDTLS_MODE_STREAM )
1601 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
1602 ssl->transform_in->iv_dec,
1603 ssl->transform_in->ivlen,
1604 ssl->in_msg, ssl->in_msglen,
1605 ssl->in_msg, &olen ) ) != 0 )
1607 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
1611 if( ssl->in_msglen != olen )
1613 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1614 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1618 #endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
1619 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
1620 if( mode == MBEDTLS_MODE_GCM ||
1621 mode == MBEDTLS_MODE_CCM )
1624 size_t dec_msglen, olen;
1625 unsigned char *dec_msg;
1626 unsigned char *dec_msg_result;
1627 unsigned char add_data[13];
1628 unsigned char taglen = ssl->transform_in->ciphersuite_info->flags &
1629 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
1630 size_t explicit_iv_len = ssl->transform_in->ivlen -
1631 ssl->transform_in->fixed_ivlen;
1633 if( ssl->in_msglen < explicit_iv_len + taglen )
1635 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) "
1636 "+ taglen (%d)", ssl->in_msglen,
1637 explicit_iv_len, taglen ) );
1638 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1640 dec_msglen = ssl->in_msglen - explicit_iv_len - taglen;
1642 dec_msg = ssl->in_msg;
1643 dec_msg_result = ssl->in_msg;
1644 ssl->in_msglen = dec_msglen;
1646 memcpy( add_data, ssl->in_ctr, 8 );
1647 add_data[8] = ssl->in_msgtype;
1648 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
1649 ssl->conf->transport, add_data + 9 );
1650 add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF;
1651 add_data[12] = ssl->in_msglen & 0xFF;
1653 MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
1656 memcpy( ssl->transform_in->iv_dec + ssl->transform_in->fixed_ivlen,
1658 ssl->transform_in->ivlen - ssl->transform_in->fixed_ivlen );
1660 MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->transform_in->iv_dec,
1661 ssl->transform_in->ivlen );
1662 MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen );
1665 * Decrypt and authenticate
1667 if( ( ret = mbedtls_cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec,
1668 ssl->transform_in->iv_dec,
1669 ssl->transform_in->ivlen,
1671 dec_msg, dec_msglen,
1672 dec_msg_result, &olen,
1673 dec_msg + dec_msglen, taglen ) ) != 0 )
1675 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_decrypt", ret );
1677 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
1678 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1684 if( olen != dec_msglen )
1686 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1687 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1691 #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
1692 #if defined(MBEDTLS_CIPHER_MODE_CBC) && \
1693 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
1694 if( mode == MBEDTLS_MODE_CBC )
1697 * Decrypt and check the padding
1700 unsigned char *dec_msg;
1701 unsigned char *dec_msg_result;
1707 * Check immediate ciphertext sanity
1709 #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
1710 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
1711 minlen += ssl->transform_in->ivlen;
1714 if( ssl->in_msglen < minlen + ssl->transform_in->ivlen ||
1715 ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 )
1717 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) "
1718 "+ 1 ) ( + expl IV )", ssl->in_msglen,
1719 ssl->transform_in->ivlen,
1720 ssl->transform_in->maclen ) );
1721 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1724 dec_msglen = ssl->in_msglen;
1725 dec_msg = ssl->in_msg;
1726 dec_msg_result = ssl->in_msg;
1729 * Authenticate before decrypt if enabled
1731 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1732 if( ssl->session_in->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
1734 unsigned char computed_mac[SSL_MAX_MAC_SIZE];
1735 unsigned char pseudo_hdr[13];
1737 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
1739 dec_msglen -= ssl->transform_in->maclen;
1740 ssl->in_msglen -= ssl->transform_in->maclen;
1742 memcpy( pseudo_hdr + 0, ssl->in_ctr, 8 );
1743 memcpy( pseudo_hdr + 8, ssl->in_hdr, 3 );
1744 pseudo_hdr[11] = (unsigned char)( ( ssl->in_msglen >> 8 ) & 0xFF );
1745 pseudo_hdr[12] = (unsigned char)( ( ssl->in_msglen ) & 0xFF );
1747 MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
1749 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, pseudo_hdr, 13 );
1750 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec,
1751 ssl->in_iv, ssl->in_msglen );
1752 mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, computed_mac );
1753 mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
1755 MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_iv + ssl->in_msglen,
1756 ssl->transform_in->maclen );
1757 MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac", computed_mac,
1758 ssl->transform_in->maclen );
1760 if( mbedtls_ssl_safer_memcmp( ssl->in_iv + ssl->in_msglen, computed_mac,
1761 ssl->transform_in->maclen ) != 0 )
1763 MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
1765 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1769 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
1772 * Check length sanity
1774 if( ssl->in_msglen % ssl->transform_in->ivlen != 0 )
1776 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0",
1777 ssl->in_msglen, ssl->transform_in->ivlen ) );
1778 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1781 #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
1783 * Initialize for prepended IV for block cipher in TLS v1.1 and up
1785 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
1787 dec_msglen -= ssl->transform_in->ivlen;
1788 ssl->in_msglen -= ssl->transform_in->ivlen;
1790 for( i = 0; i < ssl->transform_in->ivlen; i++ )
1791 ssl->transform_in->iv_dec[i] = ssl->in_iv[i];
1793 #endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
1795 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
1796 ssl->transform_in->iv_dec,
1797 ssl->transform_in->ivlen,
1798 dec_msg, dec_msglen,
1799 dec_msg_result, &olen ) ) != 0 )
1801 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
1805 if( dec_msglen != olen )
1807 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1808 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1811 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
1812 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
1815 * Save IV in SSL3 and TLS1
1817 memcpy( ssl->transform_in->iv_dec,
1818 ssl->transform_in->cipher_ctx_dec.iv,
1819 ssl->transform_in->ivlen );
1823 padlen = 1 + ssl->in_msg[ssl->in_msglen - 1];
1825 if( ssl->in_msglen < ssl->transform_in->maclen + padlen &&
1828 #if defined(MBEDTLS_SSL_DEBUG_ALL)
1829 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)",
1830 ssl->in_msglen, ssl->transform_in->maclen, padlen ) );
1836 #if defined(MBEDTLS_SSL_PROTO_SSL3)
1837 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
1839 if( padlen > ssl->transform_in->ivlen )
1841 #if defined(MBEDTLS_SSL_DEBUG_ALL)
1842 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, "
1843 "should be no more than %d",
1844 padlen, ssl->transform_in->ivlen ) );
1850 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
1851 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1852 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1853 if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
1856 * TLSv1+: always check the padding up to the first failure
1857 * and fake check up to 256 bytes of padding
1859 size_t pad_count = 0, real_count = 1;
1860 size_t padding_idx = ssl->in_msglen - padlen - 1;
1863 * Padding is guaranteed to be incorrect if:
1864 * 1. padlen >= ssl->in_msglen
1866 * 2. padding_idx >= MBEDTLS_SSL_MAX_CONTENT_LEN +
1867 * ssl->transform_in->maclen
1869 * In both cases we reset padding_idx to a safe value (0) to
1870 * prevent out-of-buffer reads.
1872 correct &= ( ssl->in_msglen >= padlen + 1 );
1873 correct &= ( padding_idx < MBEDTLS_SSL_MAX_CONTENT_LEN +
1874 ssl->transform_in->maclen );
1876 padding_idx *= correct;
1878 for( i = 1; i <= 256; i++ )
1880 real_count &= ( i <= padlen );
1881 pad_count += real_count *
1882 ( ssl->in_msg[padding_idx + i] == padlen - 1 );
1885 correct &= ( pad_count == padlen ); /* Only 1 on correct padding */
1887 #if defined(MBEDTLS_SSL_DEBUG_ALL)
1888 if( padlen > 0 && correct == 0 )
1889 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) );
1891 padlen &= correct * 0x1FF;
1894 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
1895 MBEDTLS_SSL_PROTO_TLS1_2 */
1897 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1898 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1901 ssl->in_msglen -= padlen;
1904 #endif /* MBEDTLS_CIPHER_MODE_CBC &&
1905 ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
1907 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1908 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1911 MBEDTLS_SSL_DEBUG_BUF( 4, "raw buffer after decryption",
1912 ssl->in_msg, ssl->in_msglen );
1915 * Authenticate if not done yet.
1916 * Compute the MAC regardless of the padding result (RFC4346, CBCTIME).
1918 #if defined(SSL_SOME_MODES_USE_MAC)
1919 if( auth_done == 0 )
1921 unsigned char tmp[SSL_MAX_MAC_SIZE];
1923 ssl->in_msglen -= ssl->transform_in->maclen;
1925 ssl->in_len[0] = (unsigned char)( ssl->in_msglen >> 8 );
1926 ssl->in_len[1] = (unsigned char)( ssl->in_msglen );
1928 memcpy( tmp, ssl->in_msg + ssl->in_msglen, ssl->transform_in->maclen );
1930 #if defined(MBEDTLS_SSL_PROTO_SSL3)
1931 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
1933 ssl_mac( &ssl->transform_in->md_ctx_dec,
1934 ssl->transform_in->mac_dec,
1935 ssl->in_msg, ssl->in_msglen,
1936 ssl->in_ctr, ssl->in_msgtype );
1939 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
1940 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1941 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1942 if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
1945 * Process MAC and always update for padlen afterwards to make
1946 * total time independent of padlen
1948 * extra_run compensates MAC check for padlen
1950 * Known timing attacks:
1951 * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf)
1953 * We use ( ( Lx + 8 ) / 64 ) to handle 'negative Lx' values
1954 * correctly. (We round down instead of up, so -56 is the correct
1955 * value for our calculations instead of -55)
1957 size_t j, extra_run = 0;
1958 extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 -
1959 ( 13 + ssl->in_msglen + 8 ) / 64;
1961 extra_run &= correct * 0xFF;
1963 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 8 );
1964 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_hdr, 3 );
1965 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_len, 2 );
1966 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg,
1968 mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec,
1969 ssl->in_msg + ssl->in_msglen );
1970 /* Call mbedtls_md_process at least once due to cache attacks */
1971 for( j = 0; j < extra_run + 1; j++ )
1972 mbedtls_md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg );
1974 mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
1977 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
1978 MBEDTLS_SSL_PROTO_TLS1_2 */
1980 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1981 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1984 MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", tmp, ssl->transform_in->maclen );
1985 MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac", ssl->in_msg + ssl->in_msglen,
1986 ssl->transform_in->maclen );
1988 if( mbedtls_ssl_safer_memcmp( tmp, ssl->in_msg + ssl->in_msglen,
1989 ssl->transform_in->maclen ) != 0 )
1991 #if defined(MBEDTLS_SSL_DEBUG_ALL)
1992 MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
1999 * Finally check the correct flag
2002 return( MBEDTLS_ERR_SSL_INVALID_MAC );
2004 #endif /* SSL_SOME_MODES_USE_MAC */
2006 /* Make extra sure authentication was performed, exactly once */
2007 if( auth_done != 1 )
2009 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2010 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2013 if( ssl->in_msglen == 0 )
2018 * Three or more empty messages may be a DoS attack
2019 * (excessive CPU consumption).
2021 if( ssl->nb_zero > 3 )
2023 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty "
2024 "messages, possible DoS attack" ) );
2025 return( MBEDTLS_ERR_SSL_INVALID_MAC );
2031 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2032 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
2034 ; /* in_ctr read from peer, not maintained internally */
2039 for( i = 8; i > ssl_ep_len( ssl ); i-- )
2040 if( ++ssl->in_ctr[i - 1] != 0 )
2043 /* The loop goes to its end iff the counter is wrapping */
2044 if( i == ssl_ep_len( ssl ) )
2046 MBEDTLS_SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) );
2047 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
2051 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
2057 #undef MAC_PLAINTEXT
2058 #undef MAC_CIPHERTEXT
2060 #if defined(MBEDTLS_ZLIB_SUPPORT)
2062 * Compression/decompression functions
2064 static int ssl_compress_buf( mbedtls_ssl_context *ssl )
2067 unsigned char *msg_post = ssl->out_msg;
2068 size_t len_pre = ssl->out_msglen;
2069 unsigned char *msg_pre = ssl->compress_buf;
2071 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> compress buf" ) );
2076 memcpy( msg_pre, ssl->out_msg, len_pre );
2078 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ",
2079 ssl->out_msglen ) );
2081 MBEDTLS_SSL_DEBUG_BUF( 4, "before compression: output payload",
2082 ssl->out_msg, ssl->out_msglen );
2084 ssl->transform_out->ctx_deflate.next_in = msg_pre;
2085 ssl->transform_out->ctx_deflate.avail_in = len_pre;
2086 ssl->transform_out->ctx_deflate.next_out = msg_post;
2087 ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_BUFFER_LEN;
2089 ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH );
2092 MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) );
2093 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
2096 ssl->out_msglen = MBEDTLS_SSL_BUFFER_LEN -
2097 ssl->transform_out->ctx_deflate.avail_out;
2099 MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ",
2100 ssl->out_msglen ) );
2102 MBEDTLS_SSL_DEBUG_BUF( 4, "after compression: output payload",
2103 ssl->out_msg, ssl->out_msglen );
2105 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= compress buf" ) );
2110 static int ssl_decompress_buf( mbedtls_ssl_context *ssl )
2113 unsigned char *msg_post = ssl->in_msg;
2114 size_t len_pre = ssl->in_msglen;
2115 unsigned char *msg_pre = ssl->compress_buf;
2117 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) );
2122 memcpy( msg_pre, ssl->in_msg, len_pre );
2124 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ",
2127 MBEDTLS_SSL_DEBUG_BUF( 4, "before decompression: input payload",
2128 ssl->in_msg, ssl->in_msglen );
2130 ssl->transform_in->ctx_inflate.next_in = msg_pre;
2131 ssl->transform_in->ctx_inflate.avail_in = len_pre;
2132 ssl->transform_in->ctx_inflate.next_out = msg_post;
2133 ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_MAX_CONTENT_LEN;
2135 ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH );
2138 MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) );
2139 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
2142 ssl->in_msglen = MBEDTLS_SSL_MAX_CONTENT_LEN -
2143 ssl->transform_in->ctx_inflate.avail_out;
2145 MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ",
2148 MBEDTLS_SSL_DEBUG_BUF( 4, "after decompression: input payload",
2149 ssl->in_msg, ssl->in_msglen );
2151 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) );
2155 #endif /* MBEDTLS_ZLIB_SUPPORT */
2157 #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
2158 static int ssl_write_hello_request( mbedtls_ssl_context *ssl );
2160 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2161 static int ssl_resend_hello_request( mbedtls_ssl_context *ssl )
2163 /* If renegotiation is not enforced, retransmit until we would reach max
2164 * timeout if we were using the usual handshake doubling scheme */
2165 if( ssl->conf->renego_max_records < 0 )
2167 uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1;
2168 unsigned char doublings = 1;
2176 if( ++ssl->renego_records_seen > doublings )
2178 MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) );
2183 return( ssl_write_hello_request( ssl ) );
2186 #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
2189 * Fill the input message buffer by appending data to it.
2190 * The amount of data already fetched is in ssl->in_left.
2192 * If we return 0, is it guaranteed that (at least) nb_want bytes are
2193 * available (from this read and/or a previous one). Otherwise, an error code
2194 * is returned (possibly EOF or WANT_READ).
2196 * With stream transport (TLS) on success ssl->in_left == nb_want, but
2197 * with datagram transport (DTLS) on success ssl->in_left >= nb_want,
2198 * since we always read a whole datagram at once.
2200 * For DTLS, it is up to the caller to set ssl->next_record_offset when
2201 * they're done reading a record.
2203 int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want )
2208 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> fetch input" ) );
2210 if( ssl->f_recv == NULL && ssl->f_recv_timeout == NULL )
2212 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
2213 "or mbedtls_ssl_set_bio()" ) );
2214 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2217 if( nb_want > MBEDTLS_SSL_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) )
2219 MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) );
2220 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2223 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2224 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
2228 /* Just to be sure */
2229 if( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL )
2231 MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use "
2232 "mbedtls_ssl_set_timer_cb() for DTLS" ) );
2233 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2237 * The point is, we need to always read a full datagram at once, so we
2238 * sometimes read more then requested, and handle the additional data.
2239 * It could be the rest of the current record (while fetching the
2240 * header) and/or some other records in the same datagram.
2244 * Move to the next record in the already read datagram if applicable
2246 if( ssl->next_record_offset != 0 )
2248 if( ssl->in_left < ssl->next_record_offset )
2250 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2251 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2254 ssl->in_left -= ssl->next_record_offset;
2256 if( ssl->in_left != 0 )
2258 MBEDTLS_SSL_DEBUG_MSG( 2, ( "next record in same datagram, offset: %d",
2259 ssl->next_record_offset ) );
2260 memmove( ssl->in_hdr,
2261 ssl->in_hdr + ssl->next_record_offset,
2265 ssl->next_record_offset = 0;
2268 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
2269 ssl->in_left, nb_want ) );
2272 * Done if we already have enough data.
2274 if( nb_want <= ssl->in_left)
2276 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
2281 * A record can't be split accross datagrams. If we need to read but
2282 * are not at the beginning of a new record, the caller did something
2285 if( ssl->in_left != 0 )
2287 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2288 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2292 * Don't even try to read if time's out already.
2293 * This avoids by-passing the timer when repeatedly receiving messages
2294 * that will end up being dropped.
2296 if( ssl_check_timer( ssl ) != 0 )
2297 ret = MBEDTLS_ERR_SSL_TIMEOUT;
2300 len = MBEDTLS_SSL_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf );
2302 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
2303 timeout = ssl->handshake->retransmit_timeout;
2305 timeout = ssl->conf->read_timeout;
2307 MBEDTLS_SSL_DEBUG_MSG( 3, ( "f_recv_timeout: %u ms", timeout ) );
2309 if( ssl->f_recv_timeout != NULL )
2310 ret = ssl->f_recv_timeout( ssl->p_bio, ssl->in_hdr, len,
2313 ret = ssl->f_recv( ssl->p_bio, ssl->in_hdr, len );
2315 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
2318 return( MBEDTLS_ERR_SSL_CONN_EOF );
2321 if( ret == MBEDTLS_ERR_SSL_TIMEOUT )
2323 MBEDTLS_SSL_DEBUG_MSG( 2, ( "timeout" ) );
2324 ssl_set_timer( ssl, 0 );
2326 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
2328 if( ssl_double_retransmit_timeout( ssl ) != 0 )
2330 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake timeout" ) );
2331 return( MBEDTLS_ERR_SSL_TIMEOUT );
2334 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
2336 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
2340 return( MBEDTLS_ERR_SSL_WANT_READ );
2342 #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
2343 else if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
2344 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
2346 if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
2348 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
2352 return( MBEDTLS_ERR_SSL_WANT_READ );
2354 #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
2365 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
2366 ssl->in_left, nb_want ) );
2368 while( ssl->in_left < nb_want )
2370 len = nb_want - ssl->in_left;
2372 if( ssl_check_timer( ssl ) != 0 )
2373 ret = MBEDTLS_ERR_SSL_TIMEOUT;
2376 if( ssl->f_recv_timeout != NULL )
2378 ret = ssl->f_recv_timeout( ssl->p_bio,
2379 ssl->in_hdr + ssl->in_left, len,
2380 ssl->conf->read_timeout );
2384 ret = ssl->f_recv( ssl->p_bio,
2385 ssl->in_hdr + ssl->in_left, len );
2389 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
2390 ssl->in_left, nb_want ) );
2391 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
2394 return( MBEDTLS_ERR_SSL_CONN_EOF );
2399 ssl->in_left += ret;
2403 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
2409 * Flush any data not yet written
2411 int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl )
2414 unsigned char *buf, i;
2416 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> flush output" ) );
2418 if( ssl->f_send == NULL )
2420 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
2421 "or mbedtls_ssl_set_bio()" ) );
2422 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2425 /* Avoid incrementing counter if data is flushed */
2426 if( ssl->out_left == 0 )
2428 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
2432 while( ssl->out_left > 0 )
2434 MBEDTLS_SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d",
2435 mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen, ssl->out_left ) );
2437 buf = ssl->out_hdr + mbedtls_ssl_hdr_len( ssl ) +
2438 ssl->out_msglen - ssl->out_left;
2439 ret = ssl->f_send( ssl->p_bio, buf, ssl->out_left );
2441 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_send", ret );
2446 ssl->out_left -= ret;
2449 for( i = 8; i > ssl_ep_len( ssl ); i-- )
2450 if( ++ssl->out_ctr[i - 1] != 0 )
2453 /* The loop goes to its end iff the counter is wrapping */
2454 if( i == ssl_ep_len( ssl ) )
2456 MBEDTLS_SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) );
2457 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
2460 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
2466 * Functions to handle the DTLS retransmission state machine
2468 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2470 * Append current handshake message to current outgoing flight
2472 static int ssl_flight_append( mbedtls_ssl_context *ssl )
2474 mbedtls_ssl_flight_item *msg;
2476 /* Allocate space for current message */
2477 if( ( msg = mbedtls_calloc( 1, sizeof( mbedtls_ssl_flight_item ) ) ) == NULL )
2479 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed",
2480 sizeof( mbedtls_ssl_flight_item ) ) );
2481 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
2484 if( ( msg->p = mbedtls_calloc( 1, ssl->out_msglen ) ) == NULL )
2486 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", ssl->out_msglen ) );
2487 mbedtls_free( msg );
2488 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
2491 /* Copy current handshake message with headers */
2492 memcpy( msg->p, ssl->out_msg, ssl->out_msglen );
2493 msg->len = ssl->out_msglen;
2494 msg->type = ssl->out_msgtype;
2497 /* Append to the current flight */
2498 if( ssl->handshake->flight == NULL )
2499 ssl->handshake->flight = msg;
2502 mbedtls_ssl_flight_item *cur = ssl->handshake->flight;
2503 while( cur->next != NULL )
2512 * Free the current flight of handshake messages
2514 static void ssl_flight_free( mbedtls_ssl_flight_item *flight )
2516 mbedtls_ssl_flight_item *cur = flight;
2517 mbedtls_ssl_flight_item *next;
2519 while( cur != NULL )
2523 mbedtls_free( cur->p );
2524 mbedtls_free( cur );
2530 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
2531 static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl );
2535 * Swap transform_out and out_ctr with the alternative ones
2537 static void ssl_swap_epochs( mbedtls_ssl_context *ssl )
2539 mbedtls_ssl_transform *tmp_transform;
2540 unsigned char tmp_out_ctr[8];
2542 if( ssl->transform_out == ssl->handshake->alt_transform_out )
2544 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip swap epochs" ) );
2548 MBEDTLS_SSL_DEBUG_MSG( 3, ( "swap epochs" ) );
2550 /* Swap transforms */
2551 tmp_transform = ssl->transform_out;
2552 ssl->transform_out = ssl->handshake->alt_transform_out;
2553 ssl->handshake->alt_transform_out = tmp_transform;
2555 /* Swap epoch + sequence_number */
2556 memcpy( tmp_out_ctr, ssl->out_ctr, 8 );
2557 memcpy( ssl->out_ctr, ssl->handshake->alt_out_ctr, 8 );
2558 memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 );
2560 /* Adjust to the newly activated transform */
2561 if( ssl->transform_out != NULL &&
2562 ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
2564 ssl->out_msg = ssl->out_iv + ssl->transform_out->ivlen -
2565 ssl->transform_out->fixed_ivlen;
2568 ssl->out_msg = ssl->out_iv;
2570 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
2571 if( mbedtls_ssl_hw_record_activate != NULL )
2573 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
2575 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
2576 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
2583 * Retransmit the current flight of messages.
2585 * Need to remember the current message in case flush_output returns
2586 * WANT_WRITE, causing us to exit this function and come back later.
2587 * This function must be called until state is no longer SENDING.
2589 int mbedtls_ssl_resend( mbedtls_ssl_context *ssl )
2591 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_resend" ) );
2593 if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING )
2595 MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise resending" ) );
2597 ssl->handshake->cur_msg = ssl->handshake->flight;
2598 ssl_swap_epochs( ssl );
2600 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_SENDING;
2603 while( ssl->handshake->cur_msg != NULL )
2606 mbedtls_ssl_flight_item *cur = ssl->handshake->cur_msg;
2608 /* Swap epochs before sending Finished: we can't do it after
2609 * sending ChangeCipherSpec, in case write returns WANT_READ.
2610 * Must be done before copying, may change out_msg pointer */
2611 if( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE &&
2612 cur->p[0] == MBEDTLS_SSL_HS_FINISHED )
2614 ssl_swap_epochs( ssl );
2617 memcpy( ssl->out_msg, cur->p, cur->len );
2618 ssl->out_msglen = cur->len;
2619 ssl->out_msgtype = cur->type;
2621 ssl->handshake->cur_msg = cur->next;
2623 MBEDTLS_SSL_DEBUG_BUF( 3, "resent handshake message header", ssl->out_msg, 12 );
2625 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
2627 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
2632 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
2633 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
2636 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
2637 ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
2640 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_resend" ) );
2646 * To be called when the last message of an incoming flight is received.
2648 void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl )
2650 /* We won't need to resend that one any more */
2651 ssl_flight_free( ssl->handshake->flight );
2652 ssl->handshake->flight = NULL;
2653 ssl->handshake->cur_msg = NULL;
2655 /* The next incoming flight will start with this msg_seq */
2656 ssl->handshake->in_flight_start_seq = ssl->handshake->in_msg_seq;
2659 ssl_set_timer( ssl, 0 );
2661 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
2662 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
2664 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
2667 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
2671 * To be called when the last message of an outgoing flight is send.
2673 void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl )
2675 ssl_reset_retransmit_timeout( ssl );
2676 ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
2678 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
2679 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
2681 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
2684 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
2686 #endif /* MBEDTLS_SSL_PROTO_DTLS */
2689 * Record layer functions
2693 * Write current record.
2694 * Uses ssl->out_msgtype, ssl->out_msglen and bytes at ssl->out_msg.
2696 int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl )
2698 int ret, done = 0, out_msg_type;
2699 size_t len = ssl->out_msglen;
2701 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) );
2703 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2704 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
2705 ssl->handshake != NULL &&
2706 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
2708 ; /* Skip special handshake treatment when resending */
2712 if( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
2714 out_msg_type = ssl->out_msg[0];
2716 if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST &&
2717 ssl->handshake == NULL )
2719 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2720 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2723 ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 );
2724 ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 );
2725 ssl->out_msg[3] = (unsigned char)( ( len - 4 ) );
2728 * DTLS has additional fields in the Handshake layer,
2729 * between the length field and the actual payload:
2730 * uint16 message_seq;
2731 * uint24 fragment_offset;
2732 * uint24 fragment_length;
2734 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2735 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
2737 /* Make room for the additional DTLS fields */
2738 memmove( ssl->out_msg + 12, ssl->out_msg + 4, len - 4 );
2739 ssl->out_msglen += 8;
2742 /* Write message_seq and update it, except for HelloRequest */
2743 if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
2745 ssl->out_msg[4] = ( ssl->handshake->out_msg_seq >> 8 ) & 0xFF;
2746 ssl->out_msg[5] = ( ssl->handshake->out_msg_seq ) & 0xFF;
2747 ++( ssl->handshake->out_msg_seq );
2751 ssl->out_msg[4] = 0;
2752 ssl->out_msg[5] = 0;
2755 /* We don't fragment, so frag_offset = 0 and frag_len = len */
2756 memset( ssl->out_msg + 6, 0x00, 3 );
2757 memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 );
2759 #endif /* MBEDTLS_SSL_PROTO_DTLS */
2761 if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
2762 ssl->handshake->update_checksum( ssl, ssl->out_msg, len );
2765 /* Save handshake and CCS messages for resending */
2766 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2767 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
2768 ssl->handshake != NULL &&
2769 ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING &&
2770 ( ssl->out_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ||
2771 ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) )
2773 if( ( ret = ssl_flight_append( ssl ) ) != 0 )
2775 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_flight_append", ret );
2781 #if defined(MBEDTLS_ZLIB_SUPPORT)
2782 if( ssl->transform_out != NULL &&
2783 ssl->session_out->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
2785 if( ( ret = ssl_compress_buf( ssl ) ) != 0 )
2787 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compress_buf", ret );
2791 len = ssl->out_msglen;
2793 #endif /*MBEDTLS_ZLIB_SUPPORT */
2795 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
2796 if( mbedtls_ssl_hw_record_write != NULL )
2798 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_write()" ) );
2800 ret = mbedtls_ssl_hw_record_write( ssl );
2801 if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
2803 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_write", ret );
2804 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
2810 #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
2813 ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
2814 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
2815 ssl->conf->transport, ssl->out_hdr + 1 );
2817 ssl->out_len[0] = (unsigned char)( len >> 8 );
2818 ssl->out_len[1] = (unsigned char)( len );
2820 if( ssl->transform_out != NULL )
2822 if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 )
2824 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret );
2828 len = ssl->out_msglen;
2829 ssl->out_len[0] = (unsigned char)( len >> 8 );
2830 ssl->out_len[1] = (unsigned char)( len );
2833 ssl->out_left = mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen;
2835 MBEDTLS_SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, "
2836 "version = [%d:%d], msglen = %d",
2837 ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2],
2838 ( ssl->out_len[0] << 8 ) | ssl->out_len[1] ) );
2840 MBEDTLS_SSL_DEBUG_BUF( 4, "output record sent to network",
2841 ssl->out_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen );
2844 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
2846 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
2850 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write record" ) );
2855 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2857 * Mark bits in bitmask (used for DTLS HS reassembly)
2859 static void ssl_bitmask_set( unsigned char *mask, size_t offset, size_t len )
2861 unsigned int start_bits, end_bits;
2863 start_bits = 8 - ( offset % 8 );
2864 if( start_bits != 8 )
2866 size_t first_byte_idx = offset / 8;
2869 if( len <= start_bits )
2871 for( ; len != 0; len-- )
2872 mask[first_byte_idx] |= 1 << ( start_bits - len );
2874 /* Avoid potential issues with offset or len becoming invalid */
2878 offset += start_bits; /* Now offset % 8 == 0 */
2881 for( ; start_bits != 0; start_bits-- )
2882 mask[first_byte_idx] |= 1 << ( start_bits - 1 );
2888 size_t last_byte_idx = ( offset + len ) / 8;
2890 len -= end_bits; /* Now len % 8 == 0 */
2892 for( ; end_bits != 0; end_bits-- )
2893 mask[last_byte_idx] |= 1 << ( 8 - end_bits );
2896 memset( mask + offset / 8, 0xFF, len / 8 );
2900 * Check that bitmask is full
2902 static int ssl_bitmask_check( unsigned char *mask, size_t len )
2906 for( i = 0; i < len / 8; i++ )
2907 if( mask[i] != 0xFF )
2910 for( i = 0; i < len % 8; i++ )
2911 if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 )
2918 * Reassemble fragmented DTLS handshake messages.
2920 * Use a temporary buffer for reassembly, divided in two parts:
2921 * - the first holds the reassembled message (including handshake header),
2922 * - the second holds a bitmask indicating which parts of the message
2923 * (excluding headers) have been received so far.
2925 static int ssl_reassemble_dtls_handshake( mbedtls_ssl_context *ssl )
2927 unsigned char *msg, *bitmask;
2928 size_t frag_len, frag_off;
2929 size_t msg_len = ssl->in_hslen - 12; /* Without headers */
2931 if( ssl->handshake == NULL )
2933 MBEDTLS_SSL_DEBUG_MSG( 1, ( "not supported outside handshake (for now)" ) );
2934 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
2938 * For first fragment, check size and allocate buffer
2940 if( ssl->handshake->hs_msg == NULL )
2944 MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d",
2947 if( ssl->in_hslen > MBEDTLS_SSL_MAX_CONTENT_LEN )
2949 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too large" ) );
2950 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
2953 /* The bitmask needs one bit per byte of message excluding header */
2954 alloc_len = 12 + msg_len + msg_len / 8 + ( msg_len % 8 != 0 );
2956 ssl->handshake->hs_msg = mbedtls_calloc( 1, alloc_len );
2957 if( ssl->handshake->hs_msg == NULL )
2959 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", alloc_len ) );
2960 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
2963 /* Prepare final header: copy msg_type, length and message_seq,
2964 * then add standardised fragment_offset and fragment_length */
2965 memcpy( ssl->handshake->hs_msg, ssl->in_msg, 6 );
2966 memset( ssl->handshake->hs_msg + 6, 0, 3 );
2967 memcpy( ssl->handshake->hs_msg + 9,
2968 ssl->handshake->hs_msg + 1, 3 );
2972 /* Make sure msg_type and length are consistent */
2973 if( memcmp( ssl->handshake->hs_msg, ssl->in_msg, 4 ) != 0 )
2975 MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment header mismatch" ) );
2976 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
2980 msg = ssl->handshake->hs_msg + 12;
2981 bitmask = msg + msg_len;
2984 * Check and copy current fragment
2986 frag_off = ( ssl->in_msg[6] << 16 ) |
2987 ( ssl->in_msg[7] << 8 ) |
2989 frag_len = ( ssl->in_msg[9] << 16 ) |
2990 ( ssl->in_msg[10] << 8 ) |
2993 if( frag_off + frag_len > msg_len )
2995 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment offset/len: %d + %d > %d",
2996 frag_off, frag_len, msg_len ) );
2997 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3000 if( frag_len + 12 > ssl->in_msglen )
3002 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment length: %d + 12 > %d",
3003 frag_len, ssl->in_msglen ) );
3004 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3007 MBEDTLS_SSL_DEBUG_MSG( 2, ( "adding fragment, offset = %d, length = %d",
3008 frag_off, frag_len ) );
3010 memcpy( msg + frag_off, ssl->in_msg + 12, frag_len );
3011 ssl_bitmask_set( bitmask, frag_off, frag_len );
3014 * Do we have the complete message by now?
3015 * If yes, finalize it, else ask to read the next record.
3017 if( ssl_bitmask_check( bitmask, msg_len ) != 0 )
3019 MBEDTLS_SSL_DEBUG_MSG( 2, ( "message is not complete yet" ) );
3020 return( MBEDTLS_ERR_SSL_WANT_READ );
3023 MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake message completed" ) );
3025 if( frag_len + 12 < ssl->in_msglen )
3028 * We'got more handshake messages in the same record.
3029 * This case is not handled now because no know implementation does
3030 * that and it's hard to test, so we prefer to fail cleanly for now.
3032 MBEDTLS_SSL_DEBUG_MSG( 1, ( "last fragment not alone in its record" ) );
3033 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
3036 if( ssl->in_left > ssl->next_record_offset )
3039 * We've got more data in the buffer after the current record,
3040 * that we don't want to overwrite. Move it before writing the
3041 * reassembled message, and adjust in_left and next_record_offset.
3043 unsigned char *cur_remain = ssl->in_hdr + ssl->next_record_offset;
3044 unsigned char *new_remain = ssl->in_msg + ssl->in_hslen;
3045 size_t remain_len = ssl->in_left - ssl->next_record_offset;
3047 /* First compute and check new lengths */
3048 ssl->next_record_offset = new_remain - ssl->in_hdr;
3049 ssl->in_left = ssl->next_record_offset + remain_len;
3051 if( ssl->in_left > MBEDTLS_SSL_BUFFER_LEN -
3052 (size_t)( ssl->in_hdr - ssl->in_buf ) )
3054 MBEDTLS_SSL_DEBUG_MSG( 1, ( "reassembled message too large for buffer" ) );
3055 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
3058 memmove( new_remain, cur_remain, remain_len );
3061 memcpy( ssl->in_msg, ssl->handshake->hs_msg, ssl->in_hslen );
3063 mbedtls_free( ssl->handshake->hs_msg );
3064 ssl->handshake->hs_msg = NULL;
3066 MBEDTLS_SSL_DEBUG_BUF( 3, "reassembled handshake message",
3067 ssl->in_msg, ssl->in_hslen );
3071 #endif /* MBEDTLS_SSL_PROTO_DTLS */
3073 int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl )
3075 if( ssl->in_msglen < mbedtls_ssl_hs_hdr_len( ssl ) )
3077 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too short: %d",
3079 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3082 ssl->in_hslen = mbedtls_ssl_hs_hdr_len( ssl ) + (
3083 ( ssl->in_msg[1] << 16 ) |
3084 ( ssl->in_msg[2] << 8 ) |
3087 MBEDTLS_SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
3088 " %d, type = %d, hslen = %d",
3089 ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
3091 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3092 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3095 unsigned int recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
3097 /* ssl->handshake is NULL when receiving ClientHello for renego */
3098 if( ssl->handshake != NULL &&
3099 recv_msg_seq != ssl->handshake->in_msg_seq )
3101 /* Retransmit only on last message from previous flight, to avoid
3102 * too many retransmissions.
3103 * Besides, No sane server ever retransmits HelloVerifyRequest */
3104 if( recv_msg_seq == ssl->handshake->in_flight_start_seq - 1 &&
3105 ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
3107 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received message from last flight, "
3108 "message_seq = %d, start_of_flight = %d",
3110 ssl->handshake->in_flight_start_seq ) );
3112 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
3114 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
3120 MBEDTLS_SSL_DEBUG_MSG( 2, ( "dropping out-of-sequence message: "
3121 "message_seq = %d, expected = %d",
3123 ssl->handshake->in_msg_seq ) );
3126 return( MBEDTLS_ERR_SSL_WANT_READ );
3128 /* Wait until message completion to increment in_msg_seq */
3130 /* Reassemble if current message is fragmented or reassembly is
3131 * already in progress */
3132 if( ssl->in_msglen < ssl->in_hslen ||
3133 memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 ||
3134 memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 ||
3135 ( ssl->handshake != NULL && ssl->handshake->hs_msg != NULL ) )
3137 MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) );
3139 if( ( ret = ssl_reassemble_dtls_handshake( ssl ) ) != 0 )
3141 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_reassemble_dtls_handshake", ret );
3147 #endif /* MBEDTLS_SSL_PROTO_DTLS */
3148 /* With TLS we don't handle fragmentation (for now) */
3149 if( ssl->in_msglen < ssl->in_hslen )
3151 MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) );
3152 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
3158 void mbedtls_ssl_update_handshake_status( mbedtls_ssl_context *ssl )
3161 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER &&
3162 ssl->handshake != NULL )
3164 ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen );
3167 /* Handshake message is complete, increment counter */
3168 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3169 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
3170 ssl->handshake != NULL )
3172 ssl->handshake->in_msg_seq++;
3178 * DTLS anti-replay: RFC 6347 4.1.2.6
3180 * in_window is a field of bits numbered from 0 (lsb) to 63 (msb).
3181 * Bit n is set iff record number in_window_top - n has been seen.
3183 * Usually, in_window_top is the last record number seen and the lsb of
3184 * in_window is set. The only exception is the initial state (record number 0
3187 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
3188 static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl )
3190 ssl->in_window_top = 0;
3194 static inline uint64_t ssl_load_six_bytes( unsigned char *buf )
3196 return( ( (uint64_t) buf[0] << 40 ) |
3197 ( (uint64_t) buf[1] << 32 ) |
3198 ( (uint64_t) buf[2] << 24 ) |
3199 ( (uint64_t) buf[3] << 16 ) |
3200 ( (uint64_t) buf[4] << 8 ) |
3201 ( (uint64_t) buf[5] ) );
3205 * Return 0 if sequence number is acceptable, -1 otherwise
3207 int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context *ssl )
3209 uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
3212 if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
3215 if( rec_seqnum > ssl->in_window_top )
3218 bit = ssl->in_window_top - rec_seqnum;
3223 if( ( ssl->in_window & ( (uint64_t) 1 << bit ) ) != 0 )
3230 * Update replay window on new validated record
3232 void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl )
3234 uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
3236 if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
3239 if( rec_seqnum > ssl->in_window_top )
3241 /* Update window_top and the contents of the window */
3242 uint64_t shift = rec_seqnum - ssl->in_window_top;
3248 ssl->in_window <<= shift;
3249 ssl->in_window |= 1;
3252 ssl->in_window_top = rec_seqnum;
3256 /* Mark that number as seen in the current window */
3257 uint64_t bit = ssl->in_window_top - rec_seqnum;
3259 if( bit < 64 ) /* Always true, but be extra sure */
3260 ssl->in_window |= (uint64_t) 1 << bit;
3263 #endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
3265 #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
3266 /* Forward declaration */
3267 static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial );
3270 * Without any SSL context, check if a datagram looks like a ClientHello with
3271 * a valid cookie, and if it doesn't, generate a HelloVerifyRequest message.
3272 * Both input and output include full DTLS headers.
3274 * - if cookie is valid, return 0
3275 * - if ClientHello looks superficially valid but cookie is not,
3276 * fill obuf and set olen, then
3277 * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
3278 * - otherwise return a specific error code
3280 static int ssl_check_dtls_clihlo_cookie(
3281 mbedtls_ssl_cookie_write_t *f_cookie_write,
3282 mbedtls_ssl_cookie_check_t *f_cookie_check,
3284 const unsigned char *cli_id, size_t cli_id_len,
3285 const unsigned char *in, size_t in_len,
3286 unsigned char *obuf, size_t buf_len, size_t *olen )
3288 size_t sid_len, cookie_len;
3291 if( f_cookie_write == NULL || f_cookie_check == NULL )
3292 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
3295 * Structure of ClientHello with record and handshake headers,
3296 * and expected values. We don't need to check a lot, more checks will be
3297 * done when actually parsing the ClientHello - skipping those checks
3298 * avoids code duplication and does not make cookie forging any easier.
3300 * 0-0 ContentType type; copied, must be handshake
3301 * 1-2 ProtocolVersion version; copied
3302 * 3-4 uint16 epoch; copied, must be 0
3303 * 5-10 uint48 sequence_number; copied
3304 * 11-12 uint16 length; (ignored)
3306 * 13-13 HandshakeType msg_type; (ignored)
3307 * 14-16 uint24 length; (ignored)
3308 * 17-18 uint16 message_seq; copied
3309 * 19-21 uint24 fragment_offset; copied, must be 0
3310 * 22-24 uint24 fragment_length; (ignored)
3312 * 25-26 ProtocolVersion client_version; (ignored)
3313 * 27-58 Random random; (ignored)
3314 * 59-xx SessionID session_id; 1 byte len + sid_len content
3315 * 60+ opaque cookie<0..2^8-1>; 1 byte len + content
3318 * Minimum length is 61 bytes.
3321 in[0] != MBEDTLS_SSL_MSG_HANDSHAKE ||
3322 in[3] != 0 || in[4] != 0 ||
3323 in[19] != 0 || in[20] != 0 || in[21] != 0 )
3325 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3329 if( sid_len > in_len - 61 )
3330 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3332 cookie_len = in[60 + sid_len];
3333 if( cookie_len > in_len - 60 )
3334 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3336 if( f_cookie_check( p_cookie, in + sid_len + 61, cookie_len,
3337 cli_id, cli_id_len ) == 0 )
3344 * If we get here, we've got an invalid cookie, let's prepare HVR.
3346 * 0-0 ContentType type; copied
3347 * 1-2 ProtocolVersion version; copied
3348 * 3-4 uint16 epoch; copied
3349 * 5-10 uint48 sequence_number; copied
3350 * 11-12 uint16 length; olen - 13
3352 * 13-13 HandshakeType msg_type; hello_verify_request
3353 * 14-16 uint24 length; olen - 25
3354 * 17-18 uint16 message_seq; copied
3355 * 19-21 uint24 fragment_offset; copied
3356 * 22-24 uint24 fragment_length; olen - 25
3358 * 25-26 ProtocolVersion server_version; 0xfe 0xff
3359 * 27-27 opaque cookie<0..2^8-1>; cookie_len = olen - 27, cookie
3361 * Minimum length is 28.
3364 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
3366 /* Copy most fields and adapt others */
3367 memcpy( obuf, in, 25 );
3368 obuf[13] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
3372 /* Generate and write actual cookie */
3374 if( f_cookie_write( p_cookie,
3375 &p, obuf + buf_len, cli_id, cli_id_len ) != 0 )
3377 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
3382 /* Go back and fill length fields */
3383 obuf[27] = (unsigned char)( *olen - 28 );
3385 obuf[14] = obuf[22] = (unsigned char)( ( *olen - 25 ) >> 16 );
3386 obuf[15] = obuf[23] = (unsigned char)( ( *olen - 25 ) >> 8 );
3387 obuf[16] = obuf[24] = (unsigned char)( ( *olen - 25 ) );
3389 obuf[11] = (unsigned char)( ( *olen - 13 ) >> 8 );
3390 obuf[12] = (unsigned char)( ( *olen - 13 ) );
3392 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
3396 * Handle possible client reconnect with the same UDP quadruplet
3397 * (RFC 6347 Section 4.2.8).
3399 * Called by ssl_parse_record_header() in case we receive an epoch 0 record
3400 * that looks like a ClientHello.
3402 * - if the input looks like a ClientHello without cookies,
3403 * send back HelloVerifyRequest, then
3404 * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
3405 * - if the input looks like a ClientHello with a valid cookie,
3406 * reset the session of the current context, and
3407 * return MBEDTLS_ERR_SSL_CLIENT_RECONNECT
3408 * - if anything goes wrong, return a specific error code
3410 * mbedtls_ssl_read_record() will ignore the record if anything else than
3411 * MBEDTLS_ERR_SSL_CLIENT_RECONNECT or 0 is returned, although this function
3412 * cannot not return 0.
3414 static int ssl_handle_possible_reconnect( mbedtls_ssl_context *ssl )
3419 ret = ssl_check_dtls_clihlo_cookie(
3420 ssl->conf->f_cookie_write,
3421 ssl->conf->f_cookie_check,
3422 ssl->conf->p_cookie,
3423 ssl->cli_id, ssl->cli_id_len,
3424 ssl->in_buf, ssl->in_left,
3425 ssl->out_buf, MBEDTLS_SSL_MAX_CONTENT_LEN, &len );
3427 MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret );
3429 if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED )
3431 /* Dont check write errors as we can't do anything here.
3432 * If the error is permanent we'll catch it later,
3433 * if it's not, then hopefully it'll work next time. */
3434 (void) ssl->f_send( ssl->p_bio, ssl->out_buf, len );
3436 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
3441 /* Got a valid cookie, partially reset context */
3442 if( ( ret = ssl_session_reset_int( ssl, 1 ) ) != 0 )
3444 MBEDTLS_SSL_DEBUG_RET( 1, "reset", ret );
3448 return( MBEDTLS_ERR_SSL_CLIENT_RECONNECT );
3453 #endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
3457 * ProtocolVersion version;
3458 * uint16 epoch; // DTLS only
3459 * uint48 sequence_number; // DTLS only
3462 * Return 0 if header looks sane (and, for DTLS, the record is expected)
3463 * MBEDTLS_ERR_SSL_INVALID_RECORD if the header looks bad,
3464 * MBEDTLS_ERR_SSL_UNEXPECTED_RECORD (DTLS only) if sane but unexpected.
3466 * With DTLS, mbedtls_ssl_read_record() will:
3467 * 1. proceed with the record if this function returns 0
3468 * 2. drop only the current record if this function returns UNEXPECTED_RECORD
3469 * 3. return CLIENT_RECONNECT if this function return that value
3470 * 4. drop the whole datagram if this function returns anything else.
3471 * Point 2 is needed when the peer is resending, and we have already received
3472 * the first record from a datagram but are still waiting for the others.
3474 static int ssl_parse_record_header( mbedtls_ssl_context *ssl )
3477 int major_ver, minor_ver;
3479 MBEDTLS_SSL_DEBUG_BUF( 4, "input record header", ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) );
3481 ssl->in_msgtype = ssl->in_hdr[0];
3482 ssl->in_msglen = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
3483 mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, ssl->in_hdr + 1 );
3485 MBEDTLS_SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, "
3486 "version = [%d:%d], msglen = %d",
3488 major_ver, minor_ver, ssl->in_msglen ) );
3490 /* Check record type */
3491 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE &&
3492 ssl->in_msgtype != MBEDTLS_SSL_MSG_ALERT &&
3493 ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
3494 ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
3496 MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) );
3498 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
3499 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3500 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ) ) != 0 )
3505 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3509 if( major_ver != ssl->major_ver )
3511 MBEDTLS_SSL_DEBUG_MSG( 1, ( "major version mismatch" ) );
3512 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3515 if( minor_ver > ssl->conf->max_minor_ver )
3517 MBEDTLS_SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) );
3518 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3521 /* Check length against the size of our buffer */
3522 if( ssl->in_msglen > MBEDTLS_SSL_BUFFER_LEN
3523 - (size_t)( ssl->in_msg - ssl->in_buf ) )
3525 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3526 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3529 /* Check length against bounds of the current transform and version */
3530 if( ssl->transform_in == NULL )
3532 if( ssl->in_msglen < 1 ||
3533 ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
3535 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3536 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3541 if( ssl->in_msglen < ssl->transform_in->minlen )
3543 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3544 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3547 #if defined(MBEDTLS_SSL_PROTO_SSL3)
3548 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
3549 ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_MAX_CONTENT_LEN )
3551 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3552 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3555 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
3556 defined(MBEDTLS_SSL_PROTO_TLS1_2)
3558 * TLS encrypted messages can have up to 256 bytes of padding
3560 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 &&
3561 ssl->in_msglen > ssl->transform_in->minlen +
3562 MBEDTLS_SSL_MAX_CONTENT_LEN + 256 )
3564 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3565 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3571 * DTLS-related tests done last, because most of them may result in
3572 * silently dropping the record (but not the whole datagram), and we only
3573 * want to consider that after ensuring that the "basic" fields (type,
3574 * version, length) are sane.
3576 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3577 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3579 unsigned int rec_epoch = ( ssl->in_ctr[0] << 8 ) | ssl->in_ctr[1];
3581 /* Drop unexpected ChangeCipherSpec messages */
3582 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
3583 ssl->state != MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC &&
3584 ssl->state != MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC )
3586 MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ChangeCipherSpec" ) );
3587 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3590 /* Drop unexpected ApplicationData records,
3591 * except at the beginning of renegotiations */
3592 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA &&
3593 ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER
3594 #if defined(MBEDTLS_SSL_RENEGOTIATION)
3595 && ! ( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
3596 ssl->state == MBEDTLS_SSL_SERVER_HELLO )
3600 MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ApplicationData" ) );
3601 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3604 /* Check epoch (and sequence number) with DTLS */
3605 if( rec_epoch != ssl->in_epoch )
3607 MBEDTLS_SSL_DEBUG_MSG( 1, ( "record from another epoch: "
3608 "expected %d, received %d",
3609 ssl->in_epoch, rec_epoch ) );
3611 #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
3613 * Check for an epoch 0 ClientHello. We can't use in_msg here to
3614 * access the first byte of record content (handshake type), as we
3615 * have an active transform (possibly iv_len != 0), so use the
3616 * fact that the record header len is 13 instead.
3618 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
3619 ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER &&
3621 ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
3622 ssl->in_left > 13 &&
3623 ssl->in_buf[13] == MBEDTLS_SSL_HS_CLIENT_HELLO )
3625 MBEDTLS_SSL_DEBUG_MSG( 1, ( "possible client reconnect "
3626 "from the same port" ) );
3627 return( ssl_handle_possible_reconnect( ssl ) );
3630 #endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
3631 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3634 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
3635 /* Replay detection only works for the current epoch */
3636 if( rec_epoch == ssl->in_epoch &&
3637 mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
3639 MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record" ) );
3640 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3644 #endif /* MBEDTLS_SSL_PROTO_DTLS */
3650 * If applicable, decrypt (and decompress) record content
3652 static int ssl_prepare_record_content( mbedtls_ssl_context *ssl )
3656 MBEDTLS_SSL_DEBUG_BUF( 4, "input record from network",
3657 ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen );
3659 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
3660 if( mbedtls_ssl_hw_record_read != NULL )
3662 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_read()" ) );
3664 ret = mbedtls_ssl_hw_record_read( ssl );
3665 if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
3667 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_read", ret );
3668 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
3674 #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
3675 if( !done && ssl->transform_in != NULL )
3677 if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
3679 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret );
3683 MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt",
3684 ssl->in_msg, ssl->in_msglen );
3686 if( ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
3688 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3689 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3693 #if defined(MBEDTLS_ZLIB_SUPPORT)
3694 if( ssl->transform_in != NULL &&
3695 ssl->session_in->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
3697 if( ( ret = ssl_decompress_buf( ssl ) ) != 0 )
3699 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret );
3703 #endif /* MBEDTLS_ZLIB_SUPPORT */
3705 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
3706 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3708 mbedtls_ssl_dtls_replay_update( ssl );
3715 static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl );
3720 * Silently ignore non-fatal alert (and for DTLS, invalid records as well,
3721 * RFC 6347 4.1.2.7) and continue reading until a valid record is found.
3724 int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl )
3728 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read record" ) );
3732 if( ( ret = mbedtls_ssl_read_record_layer( ssl ) ) != 0 )
3734 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret );
3738 ret = mbedtls_ssl_handle_message_type( ssl );
3740 } while( MBEDTLS_ERR_SSL_NON_FATAL == ret );
3744 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_handle_message_type" ), ret );
3748 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
3750 mbedtls_ssl_update_handshake_status( ssl );
3753 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) );
3758 int mbedtls_ssl_read_record_layer( mbedtls_ssl_context *ssl )
3762 if( ssl->in_hslen != 0 && ssl->in_hslen < ssl->in_msglen )
3765 * Get next Handshake message in the current record
3767 ssl->in_msglen -= ssl->in_hslen;
3769 memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen,
3772 MBEDTLS_SSL_DEBUG_BUF( 4, "remaining content in record",
3773 ssl->in_msg, ssl->in_msglen );
3781 * Read the record header and parse it
3783 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3787 if( ( ret = mbedtls_ssl_fetch_input( ssl, mbedtls_ssl_hdr_len( ssl ) ) ) != 0 )
3789 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
3793 if( ( ret = ssl_parse_record_header( ssl ) ) != 0 )
3795 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3796 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
3797 ret != MBEDTLS_ERR_SSL_CLIENT_RECONNECT )
3799 if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_RECORD )
3801 /* Skip unexpected record (but not whole datagram) */
3802 ssl->next_record_offset = ssl->in_msglen
3803 + mbedtls_ssl_hdr_len( ssl );
3805 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding unexpected record "
3810 /* Skip invalid record and the rest of the datagram */
3811 ssl->next_record_offset = 0;
3814 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record "
3818 /* Get next record */
3819 goto read_record_header;
3826 * Read and optionally decrypt the message contents
3828 if( ( ret = mbedtls_ssl_fetch_input( ssl,
3829 mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ) ) != 0 )
3831 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
3835 /* Done reading this record, get ready for the next one */
3836 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3837 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3838 ssl->next_record_offset = ssl->in_msglen + mbedtls_ssl_hdr_len( ssl );
3843 if( ( ret = ssl_prepare_record_content( ssl ) ) != 0 )
3845 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3846 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3848 /* Silently discard invalid records */
3849 if( ret == MBEDTLS_ERR_SSL_INVALID_RECORD ||
3850 ret == MBEDTLS_ERR_SSL_INVALID_MAC )
3852 /* Except when waiting for Finished as a bad mac here
3853 * probably means something went wrong in the handshake
3854 * (eg wrong psk used, mitm downgrade attempt, etc.) */
3855 if( ssl->state == MBEDTLS_SSL_CLIENT_FINISHED ||
3856 ssl->state == MBEDTLS_SSL_SERVER_FINISHED )
3858 #if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
3859 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
3861 mbedtls_ssl_send_alert_message( ssl,
3862 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3863 MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
3869 #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
3870 if( ssl->conf->badmac_limit != 0 &&
3871 ++ssl->badmac_seen >= ssl->conf->badmac_limit )
3873 MBEDTLS_SSL_DEBUG_MSG( 1, ( "too many records with bad MAC" ) );
3874 return( MBEDTLS_ERR_SSL_INVALID_MAC );
3878 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record (mac)" ) );
3879 goto read_record_header;
3887 /* Error out (and send alert) on invalid records */
3888 #if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
3889 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
3891 mbedtls_ssl_send_alert_message( ssl,
3892 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3893 MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
3901 * When we sent the last flight of the handshake, we MUST respond to a
3902 * retransmit of the peer's previous flight with a retransmit. (In
3903 * practice, only the Finished message will make it, other messages
3904 * including CCS use the old transform so they're dropped as invalid.)
3906 * If the record we received is not a handshake message, however, it
3907 * means the peer received our last flight so we can clean up
3910 * This check needs to be done before prepare_handshake() due to an edge
3911 * case: if the client immediately requests renegotiation, this
3912 * finishes the current handshake first, avoiding the new ClientHello
3913 * being mistaken for an ancient message in the current handshake.
3915 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3916 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
3917 ssl->handshake != NULL &&
3918 ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
3920 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
3921 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
3923 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received retransmit of last flight" ) );
3925 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
3927 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
3931 return( MBEDTLS_ERR_SSL_WANT_READ );
3935 ssl_handshake_wrapup_free_hs_transform( ssl );
3943 int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl )
3948 * Handle particular types of records
3950 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
3952 if( ( ret = mbedtls_ssl_prepare_handshake_record( ssl ) ) != 0 )
3958 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
3960 MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]",
3961 ssl->in_msg[0], ssl->in_msg[1] ) );
3964 * Ignore non-fatal alerts, except close_notify and no_renegotiation
3966 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_FATAL )
3968 MBEDTLS_SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)",
3970 return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE );
3973 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
3974 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY )
3976 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a close notify message" ) );
3977 return( MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY );
3980 #if defined(MBEDTLS_SSL_RENEGOTIATION_ENABLED)
3981 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
3982 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION )
3984 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
3985 /* Will be handled when trying to parse ServerHello */
3990 #if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_SRV_C)
3991 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
3992 ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
3993 ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
3994 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
3996 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
3997 /* Will be handled in mbedtls_ssl_parse_certificate() */
4000 #endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */
4002 /* Silently ignore: fetch new message */
4003 return MBEDTLS_ERR_SSL_NON_FATAL;
4009 int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl )
4013 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
4014 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4015 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 )
4023 int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl,
4024 unsigned char level,
4025 unsigned char message )
4029 if( ssl == NULL || ssl->conf == NULL )
4030 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
4032 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) );
4034 ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
4035 ssl->out_msglen = 2;
4036 ssl->out_msg[0] = level;
4037 ssl->out_msg[1] = message;
4039 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
4041 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
4045 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= send alert message" ) );
4051 * Handshake functions
4053 #if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
4054 !defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) && \
4055 !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
4056 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
4057 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) && \
4058 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
4059 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
4060 int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
4062 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
4064 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
4066 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4067 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4068 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4069 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ||
4070 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ANON )
4072 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
4077 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4078 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
4081 int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
4083 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
4085 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
4087 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4088 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4089 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4090 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ||
4091 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ANON )
4093 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4098 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4099 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
4102 int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
4104 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
4106 const mbedtls_x509_crt *crt;
4107 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
4109 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
4111 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4112 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4113 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4114 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ||
4115 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ANON )
4117 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
4122 #if defined(MBEDTLS_SSL_CLI_C)
4123 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
4125 if( ssl->client_auth == 0 )
4127 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
4132 #if defined(MBEDTLS_SSL_PROTO_SSL3)
4134 * If using SSLv3 and got no cert, send an Alert message
4135 * (otherwise an empty Certificate message will be sent).
4137 if( mbedtls_ssl_own_cert( ssl ) == NULL &&
4138 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
4140 ssl->out_msglen = 2;
4141 ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
4142 ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING;
4143 ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT;
4145 MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) );
4148 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
4150 #endif /* MBEDTLS_SSL_CLI_C */
4151 #if defined(MBEDTLS_SSL_SRV_C)
4152 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
4154 if( mbedtls_ssl_own_cert( ssl ) == NULL )
4156 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
4157 return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED );
4162 MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) );
4165 * 0 . 0 handshake type
4166 * 1 . 3 handshake length
4167 * 4 . 6 length of all certs
4168 * 7 . 9 length of cert. 1
4169 * 10 . n-1 peer certificate
4170 * n . n+2 length of cert. 2
4171 * n+3 . ... upper level cert, etc.
4174 crt = mbedtls_ssl_own_cert( ssl );
4176 while( crt != NULL )
4179 if( n > MBEDTLS_SSL_MAX_CONTENT_LEN - 3 - i )
4181 MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d",
4182 i + 3 + n, MBEDTLS_SSL_MAX_CONTENT_LEN ) );
4183 return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
4186 ssl->out_msg[i ] = (unsigned char)( n >> 16 );
4187 ssl->out_msg[i + 1] = (unsigned char)( n >> 8 );
4188 ssl->out_msg[i + 2] = (unsigned char)( n );
4190 i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n );
4191 i += n; crt = crt->next;
4194 ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 );
4195 ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 );
4196 ssl->out_msg[6] = (unsigned char)( ( i - 7 ) );
4198 ssl->out_msglen = i;
4199 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
4200 ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE;
4202 #if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C)
4208 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
4210 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
4214 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
4219 int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
4221 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
4223 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
4224 int authmode = ssl->conf->authmode;
4226 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
4228 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4229 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4230 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4231 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ||
4232 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ANON )
4234 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4239 #if defined(MBEDTLS_SSL_SRV_C)
4240 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4241 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
4243 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4248 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
4249 if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
4250 authmode = ssl->handshake->sni_authmode;
4253 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4254 authmode == MBEDTLS_SSL_VERIFY_NONE )
4256 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY;
4257 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4263 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
4265 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
4271 #if defined(MBEDTLS_SSL_SRV_C)
4272 #if defined(MBEDTLS_SSL_PROTO_SSL3)
4274 * Check if the client sent an empty certificate
4276 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4277 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
4279 if( ssl->in_msglen == 2 &&
4280 ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT &&
4281 ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4282 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
4284 MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) );
4286 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
4287 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
4290 return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
4293 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
4295 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
4296 defined(MBEDTLS_SSL_PROTO_TLS1_2)
4297 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4298 ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
4300 if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) &&
4301 ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
4302 ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE &&
4303 memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 )
4305 MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) );
4307 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
4308 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
4311 return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
4314 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
4315 MBEDTLS_SSL_PROTO_TLS1_2 */
4316 #endif /* MBEDTLS_SSL_SRV_C */
4318 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
4320 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4321 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
4324 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE ||
4325 ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 )
4327 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4328 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4331 i = mbedtls_ssl_hs_hdr_len( ssl );
4334 * Same message structure as in mbedtls_ssl_write_certificate()
4336 n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2];
4338 if( ssl->in_msg[i] != 0 ||
4339 ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) )
4341 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4342 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4345 /* In case we tried to reuse a session but it failed */
4346 if( ssl->session_negotiate->peer_cert != NULL )
4348 mbedtls_x509_crt_free( ssl->session_negotiate->peer_cert );
4349 mbedtls_free( ssl->session_negotiate->peer_cert );
4352 if( ( ssl->session_negotiate->peer_cert = mbedtls_calloc( 1,
4353 sizeof( mbedtls_x509_crt ) ) ) == NULL )
4355 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
4356 sizeof( mbedtls_x509_crt ) ) );
4357 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
4360 mbedtls_x509_crt_init( ssl->session_negotiate->peer_cert );
4364 while( i < ssl->in_hslen )
4366 if( ssl->in_msg[i] != 0 )
4368 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4369 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4372 n = ( (unsigned int) ssl->in_msg[i + 1] << 8 )
4373 | (unsigned int) ssl->in_msg[i + 2];
4376 if( n < 128 || i + n > ssl->in_hslen )
4378 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4379 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4382 ret = mbedtls_x509_crt_parse_der( ssl->session_negotiate->peer_cert,
4383 ssl->in_msg + i, n );
4384 if( 0 != ret && ( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND ) != ret )
4386 MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
4393 MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert );
4396 * On client, make sure the server cert doesn't change during renego to
4397 * avoid "triple handshake" attack: https://secure-resumption.com/
4399 #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
4400 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
4401 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
4403 if( ssl->session->peer_cert == NULL )
4405 MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) );
4406 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4409 if( ssl->session->peer_cert->raw.len !=
4410 ssl->session_negotiate->peer_cert->raw.len ||
4411 memcmp( ssl->session->peer_cert->raw.p,
4412 ssl->session_negotiate->peer_cert->raw.p,
4413 ssl->session->peer_cert->raw.len ) != 0 )
4415 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server cert changed during renegotiation" ) );
4416 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4419 #endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
4421 if( authmode != MBEDTLS_SSL_VERIFY_NONE )
4423 mbedtls_x509_crt *ca_chain;
4424 mbedtls_x509_crl *ca_crl;
4426 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
4427 if( ssl->handshake->sni_ca_chain != NULL )
4429 ca_chain = ssl->handshake->sni_ca_chain;
4430 ca_crl = ssl->handshake->sni_ca_crl;
4435 ca_chain = ssl->conf->ca_chain;
4436 ca_crl = ssl->conf->ca_crl;
4439 if( ca_chain == NULL )
4441 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
4442 return( MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED );
4446 * Main check: verify certificate
4448 ret = mbedtls_x509_crt_verify_with_profile(
4449 ssl->session_negotiate->peer_cert,
4451 ssl->conf->cert_profile,
4453 &ssl->session_negotiate->verify_result,
4454 ssl->conf->f_vrfy, ssl->conf->p_vrfy );
4458 MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
4462 * Secondary checks: always done, but change 'ret' only if it was 0
4465 #if defined(MBEDTLS_ECP_C)
4467 const mbedtls_pk_context *pk = &ssl->session_negotiate->peer_cert->pk;
4469 /* If certificate uses an EC key, make sure the curve is OK */
4470 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) &&
4471 mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 )
4473 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) );
4475 ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
4478 #endif /* MBEDTLS_ECP_C */
4480 if( mbedtls_ssl_check_cert_usage( ssl->session_negotiate->peer_cert,
4482 ! ssl->conf->endpoint,
4483 &ssl->session_negotiate->verify_result ) != 0 )
4485 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) );
4487 ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
4490 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
4494 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
4498 #endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
4499 !MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED
4500 !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED
4501 !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED
4502 !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
4503 !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED
4504 !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
4506 int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl )
4510 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) );
4512 ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC;
4513 ssl->out_msglen = 1;
4514 ssl->out_msg[0] = 1;
4518 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
4520 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
4524 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
4529 int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl )
4533 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) );
4535 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
4537 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
4541 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
4543 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
4544 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
4547 if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 )
4549 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
4550 return( MBEDTLS_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC );
4554 * Switch to our negotiated transform and session parameters for inbound
4557 MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) );
4558 ssl->transform_in = ssl->transform_negotiate;
4559 ssl->session_in = ssl->session_negotiate;
4561 #if defined(MBEDTLS_SSL_PROTO_DTLS)
4562 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
4564 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
4565 ssl_dtls_replay_reset( ssl );
4568 /* Increment epoch */
4569 if( ++ssl->in_epoch == 0 )
4571 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
4572 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
4576 #endif /* MBEDTLS_SSL_PROTO_DTLS */
4577 memset( ssl->in_ctr, 0, 8 );
4580 * Set the in_msg pointer to the correct location based on IV length
4582 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
4584 ssl->in_msg = ssl->in_iv + ssl->transform_negotiate->ivlen -
4585 ssl->transform_negotiate->fixed_ivlen;
4588 ssl->in_msg = ssl->in_iv;
4590 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
4591 if( mbedtls_ssl_hw_record_activate != NULL )
4593 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_INBOUND ) ) != 0 )
4595 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
4596 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
4603 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) );
4608 void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl,
4609 const mbedtls_ssl_ciphersuite_t *ciphersuite_info )
4611 ((void) ciphersuite_info);
4613 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4614 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4615 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
4616 ssl->handshake->update_checksum = ssl_update_checksum_md5sha1;
4619 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4620 #if defined(MBEDTLS_SHA512_C)
4621 if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
4622 ssl->handshake->update_checksum = ssl_update_checksum_sha384;
4625 #if defined(MBEDTLS_SHA256_C)
4626 if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 )
4627 ssl->handshake->update_checksum = ssl_update_checksum_sha256;
4630 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4632 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4637 void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl )
4639 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4640 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4641 mbedtls_md5_starts( &ssl->handshake->fin_md5 );
4642 mbedtls_sha1_starts( &ssl->handshake->fin_sha1 );
4644 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4645 #if defined(MBEDTLS_SHA256_C)
4646 mbedtls_sha256_starts( &ssl->handshake->fin_sha256, 0 );
4648 #if defined(MBEDTLS_SHA512_C)
4649 mbedtls_sha512_starts( &ssl->handshake->fin_sha512, 1 );
4651 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4654 static void ssl_update_checksum_start( mbedtls_ssl_context *ssl,
4655 const unsigned char *buf, size_t len )
4657 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4658 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4659 mbedtls_md5_update( &ssl->handshake->fin_md5 , buf, len );
4660 mbedtls_sha1_update( &ssl->handshake->fin_sha1, buf, len );
4662 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4663 #if defined(MBEDTLS_SHA256_C)
4664 mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
4666 #if defined(MBEDTLS_SHA512_C)
4667 mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
4669 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4672 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4673 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4674 static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl,
4675 const unsigned char *buf, size_t len )
4677 mbedtls_md5_update( &ssl->handshake->fin_md5 , buf, len );
4678 mbedtls_sha1_update( &ssl->handshake->fin_sha1, buf, len );
4682 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4683 #if defined(MBEDTLS_SHA256_C)
4684 static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl,
4685 const unsigned char *buf, size_t len )
4687 mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
4691 #if defined(MBEDTLS_SHA512_C)
4692 static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl,
4693 const unsigned char *buf, size_t len )
4695 mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
4698 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4700 #if defined(MBEDTLS_SSL_PROTO_SSL3)
4701 static void ssl_calc_finished_ssl(
4702 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
4705 mbedtls_md5_context md5;
4706 mbedtls_sha1_context sha1;
4708 unsigned char padbuf[48];
4709 unsigned char md5sum[16];
4710 unsigned char sha1sum[20];
4712 mbedtls_ssl_session *session = ssl->session_negotiate;
4714 session = ssl->session;
4716 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) );
4718 mbedtls_md5_init( &md5 );
4719 mbedtls_sha1_init( &sha1 );
4721 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
4722 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
4727 * MD5( master + pad2 +
4728 * MD5( handshake + sender + master + pad1 ) )
4729 * + SHA1( master + pad2 +
4730 * SHA1( handshake + sender + master + pad1 ) )
4733 #if !defined(MBEDTLS_MD5_ALT)
4734 MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
4735 md5.state, sizeof( md5.state ) );
4738 #if !defined(MBEDTLS_SHA1_ALT)
4739 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
4740 sha1.state, sizeof( sha1.state ) );
4743 sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT"
4746 memset( padbuf, 0x36, 48 );
4748 mbedtls_md5_update( &md5, (const unsigned char *) sender, 4 );
4749 mbedtls_md5_update( &md5, session->master, 48 );
4750 mbedtls_md5_update( &md5, padbuf, 48 );
4751 mbedtls_md5_finish( &md5, md5sum );
4753 mbedtls_sha1_update( &sha1, (const unsigned char *) sender, 4 );
4754 mbedtls_sha1_update( &sha1, session->master, 48 );
4755 mbedtls_sha1_update( &sha1, padbuf, 40 );
4756 mbedtls_sha1_finish( &sha1, sha1sum );
4758 memset( padbuf, 0x5C, 48 );
4760 mbedtls_md5_starts( &md5 );
4761 mbedtls_md5_update( &md5, session->master, 48 );
4762 mbedtls_md5_update( &md5, padbuf, 48 );
4763 mbedtls_md5_update( &md5, md5sum, 16 );
4764 mbedtls_md5_finish( &md5, buf );
4766 mbedtls_sha1_starts( &sha1 );
4767 mbedtls_sha1_update( &sha1, session->master, 48 );
4768 mbedtls_sha1_update( &sha1, padbuf , 40 );
4769 mbedtls_sha1_update( &sha1, sha1sum, 20 );
4770 mbedtls_sha1_finish( &sha1, buf + 16 );
4772 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 );
4774 mbedtls_md5_free( &md5 );
4775 mbedtls_sha1_free( &sha1 );
4777 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4778 mbedtls_zeroize( md5sum, sizeof( md5sum ) );
4779 mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
4781 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
4783 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
4785 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
4786 static void ssl_calc_finished_tls(
4787 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
4791 mbedtls_md5_context md5;
4792 mbedtls_sha1_context sha1;
4793 unsigned char padbuf[36];
4795 mbedtls_ssl_session *session = ssl->session_negotiate;
4797 session = ssl->session;
4799 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) );
4801 mbedtls_md5_init( &md5 );
4802 mbedtls_sha1_init( &sha1 );
4804 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
4805 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
4809 * hash = PRF( master, finished_label,
4810 * MD5( handshake ) + SHA1( handshake ) )[0..11]
4813 #if !defined(MBEDTLS_MD5_ALT)
4814 MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
4815 md5.state, sizeof( md5.state ) );
4818 #if !defined(MBEDTLS_SHA1_ALT)
4819 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
4820 sha1.state, sizeof( sha1.state ) );
4823 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
4825 : "server finished";
4827 mbedtls_md5_finish( &md5, padbuf );
4828 mbedtls_sha1_finish( &sha1, padbuf + 16 );
4830 ssl->handshake->tls_prf( session->master, 48, sender,
4831 padbuf, 36, buf, len );
4833 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
4835 mbedtls_md5_free( &md5 );
4836 mbedtls_sha1_free( &sha1 );
4838 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4840 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
4842 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
4844 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4845 #if defined(MBEDTLS_SHA256_C)
4846 static void ssl_calc_finished_tls_sha256(
4847 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
4851 mbedtls_sha256_context sha256;
4852 unsigned char padbuf[32];
4854 mbedtls_ssl_session *session = ssl->session_negotiate;
4856 session = ssl->session;
4858 mbedtls_sha256_init( &sha256 );
4860 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) );
4862 mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
4866 * hash = PRF( master, finished_label,
4867 * Hash( handshake ) )[0.11]
4870 #if !defined(MBEDTLS_SHA256_ALT)
4871 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *)
4872 sha256.state, sizeof( sha256.state ) );
4875 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
4877 : "server finished";
4879 mbedtls_sha256_finish( &sha256, padbuf );
4881 ssl->handshake->tls_prf( session->master, 48, sender,
4882 padbuf, 32, buf, len );
4884 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
4886 mbedtls_sha256_free( &sha256 );
4888 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4890 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
4892 #endif /* MBEDTLS_SHA256_C */
4894 #if defined(MBEDTLS_SHA512_C)
4895 static void ssl_calc_finished_tls_sha384(
4896 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
4900 mbedtls_sha512_context sha512;
4901 unsigned char padbuf[48];
4903 mbedtls_ssl_session *session = ssl->session_negotiate;
4905 session = ssl->session;
4907 mbedtls_sha512_init( &sha512 );
4909 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) );
4911 mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
4915 * hash = PRF( master, finished_label,
4916 * Hash( handshake ) )[0.11]
4919 #if !defined(MBEDTLS_SHA512_ALT)
4920 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *)
4921 sha512.state, sizeof( sha512.state ) );
4924 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
4926 : "server finished";
4928 mbedtls_sha512_finish( &sha512, padbuf );
4930 ssl->handshake->tls_prf( session->master, 48, sender,
4931 padbuf, 48, buf, len );
4933 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
4935 mbedtls_sha512_free( &sha512 );
4937 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4939 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
4941 #endif /* MBEDTLS_SHA512_C */
4942 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4944 static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl )
4946 MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) );
4949 * Free our handshake params
4951 mbedtls_ssl_handshake_free( ssl->handshake );
4952 mbedtls_free( ssl->handshake );
4953 ssl->handshake = NULL;
4956 * Free the previous transform and swith in the current one
4958 if( ssl->transform )
4960 mbedtls_ssl_transform_free( ssl->transform );
4961 mbedtls_free( ssl->transform );
4963 ssl->transform = ssl->transform_negotiate;
4964 ssl->transform_negotiate = NULL;
4966 MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) );
4969 void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl )
4971 int resume = ssl->handshake->resume;
4973 MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) );
4975 #if defined(MBEDTLS_SSL_RENEGOTIATION)
4976 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
4978 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE;
4979 ssl->renego_records_seen = 0;
4984 * Free the previous session and switch in the current one
4988 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
4989 /* RFC 7366 3.1: keep the EtM state */
4990 ssl->session_negotiate->encrypt_then_mac =
4991 ssl->session->encrypt_then_mac;
4994 mbedtls_ssl_session_free( ssl->session );
4995 mbedtls_free( ssl->session );
4997 ssl->session = ssl->session_negotiate;
4998 ssl->session_negotiate = NULL;
5003 if( ssl->conf->f_set_cache != NULL &&
5004 ssl->session->id_len != 0 &&
5007 if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 )
5008 MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) );
5011 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5012 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
5013 ssl->handshake->flight != NULL )
5015 /* Cancel handshake timer */
5016 ssl_set_timer( ssl, 0 );
5018 /* Keep last flight around in case we need to resend it:
5019 * we need the handshake and transform structures for that */
5020 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) );
5024 ssl_handshake_wrapup_free_hs_transform( ssl );
5028 MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) );
5031 int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl )
5035 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
5038 * Set the out_msg pointer to the correct location based on IV length
5040 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
5042 ssl->out_msg = ssl->out_iv + ssl->transform_negotiate->ivlen -
5043 ssl->transform_negotiate->fixed_ivlen;
5046 ssl->out_msg = ssl->out_iv;
5048 ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint );
5051 * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites
5052 * may define some other value. Currently (early 2016), no defined
5053 * ciphersuite does this (and this is unlikely to change as activity has
5054 * moved to TLS 1.3 now) so we can keep the hardcoded 12 here.
5056 hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12;
5058 #if defined(MBEDTLS_SSL_RENEGOTIATION)
5059 ssl->verify_data_len = hash_len;
5060 memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len );
5063 ssl->out_msglen = 4 + hash_len;
5064 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
5065 ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED;
5068 * In case of session resuming, invert the client and server
5069 * ChangeCipherSpec messages order.
5071 if( ssl->handshake->resume != 0 )
5073 #if defined(MBEDTLS_SSL_CLI_C)
5074 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
5075 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
5077 #if defined(MBEDTLS_SSL_SRV_C)
5078 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
5079 ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
5086 * Switch to our negotiated transform and session parameters for outbound
5089 MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) );
5091 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5092 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5096 /* Remember current epoch settings for resending */
5097 ssl->handshake->alt_transform_out = ssl->transform_out;
5098 memcpy( ssl->handshake->alt_out_ctr, ssl->out_ctr, 8 );
5100 /* Set sequence_number to zero */
5101 memset( ssl->out_ctr + 2, 0, 6 );
5103 /* Increment epoch */
5104 for( i = 2; i > 0; i-- )
5105 if( ++ssl->out_ctr[i - 1] != 0 )
5108 /* The loop goes to its end iff the counter is wrapping */
5111 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
5112 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
5116 #endif /* MBEDTLS_SSL_PROTO_DTLS */
5117 memset( ssl->out_ctr, 0, 8 );
5119 ssl->transform_out = ssl->transform_negotiate;
5120 ssl->session_out = ssl->session_negotiate;
5122 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
5123 if( mbedtls_ssl_hw_record_activate != NULL )
5125 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
5127 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
5128 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
5133 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5134 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5135 mbedtls_ssl_send_flight_completed( ssl );
5138 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
5140 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
5144 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) );
5149 #if defined(MBEDTLS_SSL_PROTO_SSL3)
5150 #define SSL_MAX_HASH_LEN 36
5152 #define SSL_MAX_HASH_LEN 12
5155 int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl )
5158 unsigned int hash_len;
5159 unsigned char buf[SSL_MAX_HASH_LEN];
5161 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
5163 ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 );
5165 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
5167 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
5171 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
5173 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
5174 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
5177 /* There is currently no ciphersuite using another length with TLS 1.2 */
5178 #if defined(MBEDTLS_SSL_PROTO_SSL3)
5179 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
5185 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED ||
5186 ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len )
5188 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
5189 return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
5192 if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ),
5193 buf, hash_len ) != 0 )
5195 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
5196 return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
5199 #if defined(MBEDTLS_SSL_RENEGOTIATION)
5200 ssl->verify_data_len = hash_len;
5201 memcpy( ssl->peer_verify_data, buf, hash_len );
5204 if( ssl->handshake->resume != 0 )
5206 #if defined(MBEDTLS_SSL_CLI_C)
5207 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
5208 ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
5210 #if defined(MBEDTLS_SSL_SRV_C)
5211 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
5212 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
5218 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5219 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5220 mbedtls_ssl_recv_flight_completed( ssl );
5223 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
5228 static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
5230 memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) );
5232 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
5233 defined(MBEDTLS_SSL_PROTO_TLS1_1)
5234 mbedtls_md5_init( &handshake->fin_md5 );
5235 mbedtls_sha1_init( &handshake->fin_sha1 );
5236 mbedtls_md5_starts( &handshake->fin_md5 );
5237 mbedtls_sha1_starts( &handshake->fin_sha1 );
5239 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
5240 #if defined(MBEDTLS_SHA256_C)
5241 mbedtls_sha256_init( &handshake->fin_sha256 );
5242 mbedtls_sha256_starts( &handshake->fin_sha256, 0 );
5244 #if defined(MBEDTLS_SHA512_C)
5245 mbedtls_sha512_init( &handshake->fin_sha512 );
5246 mbedtls_sha512_starts( &handshake->fin_sha512, 1 );
5248 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
5250 handshake->update_checksum = ssl_update_checksum_start;
5251 handshake->sig_alg = MBEDTLS_SSL_HASH_SHA1;
5253 #if defined(MBEDTLS_DHM_C)
5254 mbedtls_dhm_init( &handshake->dhm_ctx );
5256 #if defined(MBEDTLS_ECDH_C)
5257 mbedtls_ecdh_init( &handshake->ecdh_ctx );
5259 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
5260 mbedtls_ecjpake_init( &handshake->ecjpake_ctx );
5261 #if defined(MBEDTLS_SSL_CLI_C)
5262 handshake->ecjpake_cache = NULL;
5263 handshake->ecjpake_cache_len = 0;
5267 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
5268 handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
5272 static void ssl_transform_init( mbedtls_ssl_transform *transform )
5274 memset( transform, 0, sizeof(mbedtls_ssl_transform) );
5276 mbedtls_cipher_init( &transform->cipher_ctx_enc );
5277 mbedtls_cipher_init( &transform->cipher_ctx_dec );
5279 mbedtls_md_init( &transform->md_ctx_enc );
5280 mbedtls_md_init( &transform->md_ctx_dec );
5283 void mbedtls_ssl_session_init( mbedtls_ssl_session *session )
5285 memset( session, 0, sizeof(mbedtls_ssl_session) );
5288 static int ssl_handshake_init( mbedtls_ssl_context *ssl )
5290 /* Clear old handshake information if present */
5291 if( ssl->transform_negotiate )
5292 mbedtls_ssl_transform_free( ssl->transform_negotiate );
5293 if( ssl->session_negotiate )
5294 mbedtls_ssl_session_free( ssl->session_negotiate );
5295 if( ssl->handshake )
5296 mbedtls_ssl_handshake_free( ssl->handshake );
5299 * Either the pointers are now NULL or cleared properly and can be freed.
5300 * Now allocate missing structures.
5302 if( ssl->transform_negotiate == NULL )
5304 ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) );
5307 if( ssl->session_negotiate == NULL )
5309 ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) );
5312 if( ssl->handshake == NULL )
5314 ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) );
5317 /* All pointers should exist and can be directly freed without issue */
5318 if( ssl->handshake == NULL ||
5319 ssl->transform_negotiate == NULL ||
5320 ssl->session_negotiate == NULL )
5322 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) );
5324 mbedtls_free( ssl->handshake );
5325 mbedtls_free( ssl->transform_negotiate );
5326 mbedtls_free( ssl->session_negotiate );
5328 ssl->handshake = NULL;
5329 ssl->transform_negotiate = NULL;
5330 ssl->session_negotiate = NULL;
5332 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5335 /* Initialize structures */
5336 mbedtls_ssl_session_init( ssl->session_negotiate );
5337 ssl_transform_init( ssl->transform_negotiate );
5338 ssl_handshake_params_init( ssl->handshake );
5340 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5341 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5343 ssl->handshake->alt_transform_out = ssl->transform_out;
5345 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
5346 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
5348 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
5350 ssl_set_timer( ssl, 0 );
5357 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
5358 /* Dummy cookie callbacks for defaults */
5359 static int ssl_cookie_write_dummy( void *ctx,
5360 unsigned char **p, unsigned char *end,
5361 const unsigned char *cli_id, size_t cli_id_len )
5367 ((void) cli_id_len);
5369 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
5372 static int ssl_cookie_check_dummy( void *ctx,
5373 const unsigned char *cookie, size_t cookie_len,
5374 const unsigned char *cli_id, size_t cli_id_len )
5378 ((void) cookie_len);
5380 ((void) cli_id_len);
5382 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
5384 #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
5387 * Initialize an SSL context
5389 void mbedtls_ssl_init( mbedtls_ssl_context *ssl )
5391 memset( ssl, 0, sizeof( mbedtls_ssl_context ) );
5395 * Setup an SSL context
5397 int mbedtls_ssl_setup( mbedtls_ssl_context *ssl,
5398 const mbedtls_ssl_config *conf )
5401 const size_t len = MBEDTLS_SSL_BUFFER_LEN;
5406 * Prepare base structures
5408 if( ( ssl-> in_buf = mbedtls_calloc( 1, len ) ) == NULL ||
5409 ( ssl->out_buf = mbedtls_calloc( 1, len ) ) == NULL )
5411 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", len ) );
5412 mbedtls_free( ssl->in_buf );
5414 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5417 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5418 if( conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5420 ssl->out_hdr = ssl->out_buf;
5421 ssl->out_ctr = ssl->out_buf + 3;
5422 ssl->out_len = ssl->out_buf + 11;
5423 ssl->out_iv = ssl->out_buf + 13;
5424 ssl->out_msg = ssl->out_buf + 13;
5426 ssl->in_hdr = ssl->in_buf;
5427 ssl->in_ctr = ssl->in_buf + 3;
5428 ssl->in_len = ssl->in_buf + 11;
5429 ssl->in_iv = ssl->in_buf + 13;
5430 ssl->in_msg = ssl->in_buf + 13;
5435 ssl->out_ctr = ssl->out_buf;
5436 ssl->out_hdr = ssl->out_buf + 8;
5437 ssl->out_len = ssl->out_buf + 11;
5438 ssl->out_iv = ssl->out_buf + 13;
5439 ssl->out_msg = ssl->out_buf + 13;
5441 ssl->in_ctr = ssl->in_buf;
5442 ssl->in_hdr = ssl->in_buf + 8;
5443 ssl->in_len = ssl->in_buf + 11;
5444 ssl->in_iv = ssl->in_buf + 13;
5445 ssl->in_msg = ssl->in_buf + 13;
5448 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
5455 * Reset an initialized and used SSL context for re-use while retaining
5456 * all application-set variables, function pointers and data.
5458 * If partial is non-zero, keep data in the input buffer and client ID.
5459 * (Use when a DTLS client reconnects from the same port.)
5461 static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial )
5465 ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
5467 /* Cancel any possibly running timer */
5468 ssl_set_timer( ssl, 0 );
5470 #if defined(MBEDTLS_SSL_RENEGOTIATION)
5471 ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE;
5472 ssl->renego_records_seen = 0;
5474 ssl->verify_data_len = 0;
5475 memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
5476 memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
5478 ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION;
5480 ssl->in_offt = NULL;
5482 ssl->in_msg = ssl->in_buf + 13;
5483 ssl->in_msgtype = 0;
5487 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5488 ssl->next_record_offset = 0;
5491 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
5492 ssl_dtls_replay_reset( ssl );
5497 ssl->record_read = 0;
5499 ssl->out_msg = ssl->out_buf + 13;
5500 ssl->out_msgtype = 0;
5501 ssl->out_msglen = 0;
5503 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
5504 if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED )
5505 ssl->split_done = 0;
5508 ssl->transform_in = NULL;
5509 ssl->transform_out = NULL;
5511 memset( ssl->out_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
5513 memset( ssl->in_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
5515 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
5516 if( mbedtls_ssl_hw_record_reset != NULL )
5518 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) );
5519 if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 )
5521 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret );
5522 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
5527 if( ssl->transform )
5529 mbedtls_ssl_transform_free( ssl->transform );
5530 mbedtls_free( ssl->transform );
5531 ssl->transform = NULL;
5536 mbedtls_ssl_session_free( ssl->session );
5537 mbedtls_free( ssl->session );
5538 ssl->session = NULL;
5541 #if defined(MBEDTLS_SSL_ALPN)
5542 ssl->alpn_chosen = NULL;
5545 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
5548 mbedtls_free( ssl->cli_id );
5550 ssl->cli_id_len = 0;
5554 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
5561 * Reset an initialized and used SSL context for re-use while retaining
5562 * all application-set variables, function pointers and data.
5564 int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl )
5566 return( ssl_session_reset_int( ssl, 0 ) );
5572 void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint )
5574 conf->endpoint = endpoint;
5577 void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport )
5579 conf->transport = transport;
5582 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
5583 void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode )
5585 conf->anti_replay = mode;
5589 #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
5590 void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit )
5592 conf->badmac_limit = limit;
5596 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5597 void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf, uint32_t min, uint32_t max )
5599 conf->hs_timeout_min = min;
5600 conf->hs_timeout_max = max;
5604 void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode )
5606 conf->authmode = authmode;
5609 #if defined(MBEDTLS_X509_CRT_PARSE_C)
5610 void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf,
5611 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
5614 conf->f_vrfy = f_vrfy;
5615 conf->p_vrfy = p_vrfy;
5617 #endif /* MBEDTLS_X509_CRT_PARSE_C */
5619 void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf,
5620 int (*f_rng)(void *, unsigned char *, size_t),
5623 conf->f_rng = f_rng;
5624 conf->p_rng = p_rng;
5627 void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
5628 void (*f_dbg)(void *, int, const char *, int, const char *),
5631 conf->f_dbg = f_dbg;
5632 conf->p_dbg = p_dbg;
5635 void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl,
5637 mbedtls_ssl_send_t *f_send,
5638 mbedtls_ssl_recv_t *f_recv,
5639 mbedtls_ssl_recv_timeout_t *f_recv_timeout )
5642 ssl->f_send = f_send;
5643 ssl->f_recv = f_recv;
5644 ssl->f_recv_timeout = f_recv_timeout;
5647 void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout )
5649 conf->read_timeout = timeout;
5652 void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
5654 mbedtls_ssl_set_timer_t *f_set_timer,
5655 mbedtls_ssl_get_timer_t *f_get_timer )
5657 ssl->p_timer = p_timer;
5658 ssl->f_set_timer = f_set_timer;
5659 ssl->f_get_timer = f_get_timer;
5661 /* Make sure we start with no timer running */
5662 ssl_set_timer( ssl, 0 );
5665 #if defined(MBEDTLS_SSL_SRV_C)
5666 void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf,
5668 int (*f_get_cache)(void *, mbedtls_ssl_session *),
5669 int (*f_set_cache)(void *, const mbedtls_ssl_session *) )
5671 conf->p_cache = p_cache;
5672 conf->f_get_cache = f_get_cache;
5673 conf->f_set_cache = f_set_cache;
5675 #endif /* MBEDTLS_SSL_SRV_C */
5677 #if defined(MBEDTLS_SSL_CLI_C)
5678 int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session )
5684 ssl->session_negotiate == NULL ||
5685 ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
5687 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5690 if( ( ret = ssl_session_copy( ssl->session_negotiate, session ) ) != 0 )
5693 ssl->handshake->resume = 1;
5697 #endif /* MBEDTLS_SSL_CLI_C */
5699 void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf,
5700 const int *ciphersuites )
5702 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites;
5703 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites;
5704 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites;
5705 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites;
5708 void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf,
5709 const int *ciphersuites,
5710 int major, int minor )
5712 if( major != MBEDTLS_SSL_MAJOR_VERSION_3 )
5715 if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 )
5718 conf->ciphersuite_list[minor] = ciphersuites;
5721 #if defined(MBEDTLS_X509_CRT_PARSE_C)
5722 void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf,
5723 const mbedtls_x509_crt_profile *profile )
5725 conf->cert_profile = profile;
5728 /* Append a new keycert entry to a (possibly empty) list */
5729 static int ssl_append_key_cert( mbedtls_ssl_key_cert **head,
5730 mbedtls_x509_crt *cert,
5731 mbedtls_pk_context *key )
5733 mbedtls_ssl_key_cert *new;
5735 new = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
5737 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5743 /* Update head is the list was null, else add to the end */
5750 mbedtls_ssl_key_cert *cur = *head;
5751 while( cur->next != NULL )
5759 int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf,
5760 mbedtls_x509_crt *own_cert,
5761 mbedtls_pk_context *pk_key )
5763 return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) );
5766 void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf,
5767 mbedtls_x509_crt *ca_chain,
5768 mbedtls_x509_crl *ca_crl )
5770 conf->ca_chain = ca_chain;
5771 conf->ca_crl = ca_crl;
5773 #endif /* MBEDTLS_X509_CRT_PARSE_C */
5775 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
5776 int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl,
5777 mbedtls_x509_crt *own_cert,
5778 mbedtls_pk_context *pk_key )
5780 return( ssl_append_key_cert( &ssl->handshake->sni_key_cert,
5781 own_cert, pk_key ) );
5784 void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl,
5785 mbedtls_x509_crt *ca_chain,
5786 mbedtls_x509_crl *ca_crl )
5788 ssl->handshake->sni_ca_chain = ca_chain;
5789 ssl->handshake->sni_ca_crl = ca_crl;
5792 void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl,
5795 ssl->handshake->sni_authmode = authmode;
5797 #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
5799 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
5801 * Set EC J-PAKE password for current handshake
5803 int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl,
5804 const unsigned char *pw,
5807 mbedtls_ecjpake_role role;
5809 if( ssl->handshake == NULL || ssl->conf == NULL )
5810 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5812 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
5813 role = MBEDTLS_ECJPAKE_SERVER;
5815 role = MBEDTLS_ECJPAKE_CLIENT;
5817 return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx,
5820 MBEDTLS_ECP_DP_SECP256R1,
5823 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
5825 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
5826 int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
5827 const unsigned char *psk, size_t psk_len,
5828 const unsigned char *psk_identity, size_t psk_identity_len )
5830 if( psk == NULL || psk_identity == NULL )
5831 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5833 if( psk_len > MBEDTLS_PSK_MAX_LEN )
5834 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5836 /* Identity len will be encoded on two bytes */
5837 if( ( psk_identity_len >> 16 ) != 0 ||
5838 psk_identity_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
5840 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5843 if( conf->psk != NULL || conf->psk_identity != NULL )
5845 mbedtls_free( conf->psk );
5846 mbedtls_free( conf->psk_identity );
5848 conf->psk_identity = NULL;
5851 if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ||
5852 ( conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ) ) == NULL )
5854 mbedtls_free( conf->psk );
5855 mbedtls_free( conf->psk_identity );
5857 conf->psk_identity = NULL;
5858 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5861 conf->psk_len = psk_len;
5862 conf->psk_identity_len = psk_identity_len;
5864 memcpy( conf->psk, psk, conf->psk_len );
5865 memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len );
5870 int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
5871 const unsigned char *psk, size_t psk_len )
5873 if( psk == NULL || ssl->handshake == NULL )
5874 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5876 if( psk_len > MBEDTLS_PSK_MAX_LEN )
5877 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5879 if( ssl->handshake->psk != NULL )
5880 mbedtls_free( ssl->handshake->psk );
5882 if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
5883 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5885 ssl->handshake->psk_len = psk_len;
5886 memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len );
5891 void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf,
5892 int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
5896 conf->f_psk = f_psk;
5897 conf->p_psk = p_psk;
5899 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
5901 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
5902 int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G )
5906 if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 ||
5907 ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 )
5909 mbedtls_mpi_free( &conf->dhm_P );
5910 mbedtls_mpi_free( &conf->dhm_G );
5917 int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx )
5921 if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 ||
5922 ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 )
5924 mbedtls_mpi_free( &conf->dhm_P );
5925 mbedtls_mpi_free( &conf->dhm_G );
5931 #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
5933 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
5935 * Set the minimum length for Diffie-Hellman parameters
5937 void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
5938 unsigned int bitlen )
5940 conf->dhm_min_bitlen = bitlen;
5942 #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
5944 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
5946 * Set allowed/preferred hashes for handshake signatures
5948 void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf,
5951 conf->sig_hashes = hashes;
5955 #if defined(MBEDTLS_ECP_C)
5957 * Set the allowed elliptic curves
5959 void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf,
5960 const mbedtls_ecp_group_id *curve_list )
5962 conf->curve_list = curve_list;
5966 #if defined(MBEDTLS_X509_CRT_PARSE_C)
5967 int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname )
5969 size_t hostname_len;
5971 if( hostname == NULL )
5972 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5974 hostname_len = strlen( hostname );
5976 if( hostname_len + 1 == 0 )
5977 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5979 if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN )
5980 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5982 ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 );
5984 if( ssl->hostname == NULL )
5985 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5987 memcpy( ssl->hostname, hostname, hostname_len );
5989 ssl->hostname[hostname_len] = '\0';
5995 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
5996 void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf,
5997 int (*f_sni)(void *, mbedtls_ssl_context *,
5998 const unsigned char *, size_t),
6001 conf->f_sni = f_sni;
6002 conf->p_sni = p_sni;
6004 #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
6006 #if defined(MBEDTLS_SSL_ALPN)
6007 int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos )
6009 size_t cur_len, tot_len;
6013 * "Empty strings MUST NOT be included and byte strings MUST NOT be
6014 * truncated". Check lengths now rather than later.
6017 for( p = protos; *p != NULL; p++ )
6019 cur_len = strlen( *p );
6022 if( cur_len == 0 || cur_len > 255 || tot_len > 65535 )
6023 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6026 conf->alpn_list = protos;
6031 const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl )
6033 return( ssl->alpn_chosen );
6035 #endif /* MBEDTLS_SSL_ALPN */
6037 void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
6039 conf->max_major_ver = major;
6040 conf->max_minor_ver = minor;
6043 void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor )
6045 conf->min_major_ver = major;
6046 conf->min_minor_ver = minor;
6049 #if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
6050 void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback )
6052 conf->fallback = fallback;
6056 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
6057 void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm )
6059 conf->encrypt_then_mac = etm;
6063 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
6064 void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems )
6066 conf->extended_ms = ems;
6070 #if defined(MBEDTLS_ARC4_C)
6071 void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 )
6073 conf->arc4_disabled = arc4;
6077 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
6078 int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code )
6080 if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
6081 mfl_code_to_length[mfl_code] > MBEDTLS_SSL_MAX_CONTENT_LEN )
6083 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6086 conf->mfl_code = mfl_code;
6090 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
6092 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
6093 void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate )
6095 conf->trunc_hmac = truncate;
6097 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
6099 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
6100 void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split )
6102 conf->cbc_record_splitting = split;
6106 void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy )
6108 conf->allow_legacy_renegotiation = allow_legacy;
6111 #if defined(MBEDTLS_SSL_RENEGOTIATION)
6112 void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation )
6114 conf->disable_renegotiation = renegotiation;
6117 void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records )
6119 conf->renego_max_records = max_records;
6122 void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf,
6123 const unsigned char period[8] )
6125 memcpy( conf->renego_period, period, 8 );
6127 #endif /* MBEDTLS_SSL_RENEGOTIATION */
6129 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
6130 #if defined(MBEDTLS_SSL_CLI_C)
6131 void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets )
6133 conf->session_tickets = use_tickets;
6137 #if defined(MBEDTLS_SSL_SRV_C)
6138 void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf,
6139 mbedtls_ssl_ticket_write_t *f_ticket_write,
6140 mbedtls_ssl_ticket_parse_t *f_ticket_parse,
6143 conf->f_ticket_write = f_ticket_write;
6144 conf->f_ticket_parse = f_ticket_parse;
6145 conf->p_ticket = p_ticket;
6148 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
6150 #if defined(MBEDTLS_SSL_EXPORT_KEYS)
6151 void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf,
6152 mbedtls_ssl_export_keys_t *f_export_keys,
6153 void *p_export_keys )
6155 conf->f_export_keys = f_export_keys;
6156 conf->p_export_keys = p_export_keys;
6163 size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl )
6165 return( ssl->in_offt == NULL ? 0 : ssl->in_msglen );
6168 uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
6170 if( ssl->session != NULL )
6171 return( ssl->session->verify_result );
6173 if( ssl->session_negotiate != NULL )
6174 return( ssl->session_negotiate->verify_result );
6176 return( 0xFFFFFFFF );
6179 const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl )
6181 if( ssl == NULL || ssl->session == NULL )
6184 return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite );
6187 const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl )
6189 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6190 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6192 switch( ssl->minor_ver )
6194 case MBEDTLS_SSL_MINOR_VERSION_2:
6195 return( "DTLSv1.0" );
6197 case MBEDTLS_SSL_MINOR_VERSION_3:
6198 return( "DTLSv1.2" );
6201 return( "unknown (DTLS)" );
6206 switch( ssl->minor_ver )
6208 case MBEDTLS_SSL_MINOR_VERSION_0:
6209 return( "SSLv3.0" );
6211 case MBEDTLS_SSL_MINOR_VERSION_1:
6212 return( "TLSv1.0" );
6214 case MBEDTLS_SSL_MINOR_VERSION_2:
6215 return( "TLSv1.1" );
6217 case MBEDTLS_SSL_MINOR_VERSION_3:
6218 return( "TLSv1.2" );
6221 return( "unknown" );
6225 int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
6227 size_t transform_expansion;
6228 const mbedtls_ssl_transform *transform = ssl->transform_out;
6230 #if defined(MBEDTLS_ZLIB_SUPPORT)
6231 if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL )
6232 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
6235 if( transform == NULL )
6236 return( (int) mbedtls_ssl_hdr_len( ssl ) );
6238 switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) )
6240 case MBEDTLS_MODE_GCM:
6241 case MBEDTLS_MODE_CCM:
6242 case MBEDTLS_MODE_STREAM:
6243 transform_expansion = transform->minlen;
6246 case MBEDTLS_MODE_CBC:
6247 transform_expansion = transform->maclen
6248 + mbedtls_cipher_get_block_size( &transform->cipher_ctx_enc );
6252 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
6253 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
6256 return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) );
6259 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
6260 size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
6265 * Assume mfl_code is correct since it was checked when set
6267 max_len = mfl_code_to_length[ssl->conf->mfl_code];
6270 * Check if a smaller max length was negotiated
6272 if( ssl->session_out != NULL &&
6273 mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
6275 max_len = mfl_code_to_length[ssl->session_out->mfl_code];
6280 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
6282 #if defined(MBEDTLS_X509_CRT_PARSE_C)
6283 const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
6285 if( ssl == NULL || ssl->session == NULL )
6288 return( ssl->session->peer_cert );
6290 #endif /* MBEDTLS_X509_CRT_PARSE_C */
6292 #if defined(MBEDTLS_SSL_CLI_C)
6293 int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl, mbedtls_ssl_session *dst )
6297 ssl->session == NULL ||
6298 ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
6300 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6303 return( ssl_session_copy( dst, ssl->session ) );
6305 #endif /* MBEDTLS_SSL_CLI_C */
6308 * Perform a single step of the SSL handshake
6310 int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl )
6312 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
6314 if( ssl == NULL || ssl->conf == NULL )
6315 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6317 #if defined(MBEDTLS_SSL_CLI_C)
6318 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
6319 ret = mbedtls_ssl_handshake_client_step( ssl );
6321 #if defined(MBEDTLS_SSL_SRV_C)
6322 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
6323 ret = mbedtls_ssl_handshake_server_step( ssl );
6330 * Perform the SSL handshake
6332 int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl )
6336 if( ssl == NULL || ssl->conf == NULL )
6337 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6339 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
6341 while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6343 ret = mbedtls_ssl_handshake_step( ssl );
6349 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
6354 #if defined(MBEDTLS_SSL_RENEGOTIATION)
6355 #if defined(MBEDTLS_SSL_SRV_C)
6357 * Write HelloRequest to request renegotiation on server
6359 static int ssl_write_hello_request( mbedtls_ssl_context *ssl )
6363 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) );
6365 ssl->out_msglen = 4;
6366 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
6367 ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST;
6369 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
6371 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
6375 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) );
6379 #endif /* MBEDTLS_SSL_SRV_C */
6382 * Actually renegotiate current connection, triggered by either:
6383 * - any side: calling mbedtls_ssl_renegotiate(),
6384 * - client: receiving a HelloRequest during mbedtls_ssl_read(),
6385 * - server: receiving any handshake message on server during mbedtls_ssl_read() after
6386 * the initial handshake is completed.
6387 * If the handshake doesn't complete due to waiting for I/O, it will continue
6388 * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively.
6390 static int ssl_start_renegotiation( mbedtls_ssl_context *ssl )
6394 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) );
6396 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
6399 /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and
6400 * the ServerHello will have message_seq = 1" */
6401 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6402 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
6403 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
6405 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
6406 ssl->handshake->out_msg_seq = 1;
6408 ssl->handshake->in_msg_seq = 1;
6412 ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
6413 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS;
6415 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
6417 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
6421 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) );
6427 * Renegotiate current connection on client,
6428 * or request renegotiation on server
6430 int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl )
6432 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
6434 if( ssl == NULL || ssl->conf == NULL )
6435 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6437 #if defined(MBEDTLS_SSL_SRV_C)
6438 /* On server, just send the request */
6439 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
6441 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6442 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6444 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
6446 /* Did we already try/start sending HelloRequest? */
6447 if( ssl->out_left != 0 )
6448 return( mbedtls_ssl_flush_output( ssl ) );
6450 return( ssl_write_hello_request( ssl ) );
6452 #endif /* MBEDTLS_SSL_SRV_C */
6454 #if defined(MBEDTLS_SSL_CLI_C)
6456 * On client, either start the renegotiation process or,
6457 * if already in progress, continue the handshake
6459 if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
6461 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6462 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6464 if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 )
6466 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
6472 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
6474 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
6478 #endif /* MBEDTLS_SSL_CLI_C */
6484 * Check record counters and renegotiate if they're above the limit.
6486 static int ssl_check_ctr_renegotiate( mbedtls_ssl_context *ssl )
6488 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ||
6489 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ||
6490 ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED )
6495 if( memcmp( ssl->in_ctr, ssl->conf->renego_period, 8 ) <= 0 &&
6496 memcmp( ssl->out_ctr, ssl->conf->renego_period, 8 ) <= 0 )
6501 MBEDTLS_SSL_DEBUG_MSG( 1, ( "record counter limit reached: renegotiate" ) );
6502 return( mbedtls_ssl_renegotiate( ssl ) );
6504 #endif /* MBEDTLS_SSL_RENEGOTIATION */
6507 * Receive application data decrypted from the SSL layer
6509 int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
6511 int ret, record_read = 0;
6514 if( ssl == NULL || ssl->conf == NULL )
6515 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6517 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) );
6519 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6520 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6522 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
6525 if( ssl->handshake != NULL &&
6526 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
6528 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
6534 #if defined(MBEDTLS_SSL_RENEGOTIATION)
6535 if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
6537 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
6542 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6544 ret = mbedtls_ssl_handshake( ssl );
6545 if( ret == MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO )
6551 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
6556 if( ssl->in_offt == NULL )
6558 /* Start timer if not already running */
6559 if( ssl->f_get_timer != NULL &&
6560 ssl->f_get_timer( ssl->p_timer ) == -1 )
6562 ssl_set_timer( ssl, ssl->conf->read_timeout );
6567 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
6569 if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
6572 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
6577 if( ssl->in_msglen == 0 &&
6578 ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA )
6581 * OpenSSL sends empty messages to randomize the IV
6583 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
6585 if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
6588 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
6593 #if defined(MBEDTLS_SSL_RENEGOTIATION)
6594 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
6596 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received handshake message" ) );
6598 #if defined(MBEDTLS_SSL_CLI_C)
6599 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
6600 ( ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST ||
6601 ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ) )
6603 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) );
6605 /* With DTLS, drop the packet (probably from last handshake) */
6606 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6607 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6608 return( MBEDTLS_ERR_SSL_WANT_READ );
6610 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
6613 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
6614 ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
6616 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not ClientHello)" ) );
6618 /* With DTLS, drop the packet (probably from last handshake) */
6619 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6620 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6621 return( MBEDTLS_ERR_SSL_WANT_READ );
6623 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
6627 if( ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED ||
6628 ( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
6629 ssl->conf->allow_legacy_renegotiation ==
6630 MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) )
6632 MBEDTLS_SSL_DEBUG_MSG( 3, ( "refusing renegotiation, sending alert" ) );
6634 #if defined(MBEDTLS_SSL_PROTO_SSL3)
6635 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
6638 * SSLv3 does not have a "no_renegotiation" alert
6640 if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
6644 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
6645 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
6646 defined(MBEDTLS_SSL_PROTO_TLS1_2)
6647 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
6649 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
6650 MBEDTLS_SSL_ALERT_LEVEL_WARNING,
6651 MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 )
6657 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 ||
6658 MBEDTLS_SSL_PROTO_TLS1_2 */
6660 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
6661 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
6666 /* DTLS clients need to know renego is server-initiated */
6667 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6668 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
6669 ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
6671 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
6674 ret = ssl_start_renegotiation( ssl );
6675 if( ret == MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO )
6681 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
6686 /* If a non-handshake record was read during renego, fallthrough,
6687 * else tell the user they should call mbedtls_ssl_read() again */
6689 return( MBEDTLS_ERR_SSL_WANT_READ );
6691 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
6694 if( ssl->conf->renego_max_records >= 0 )
6696 if( ++ssl->renego_records_seen > ssl->conf->renego_max_records )
6698 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
6699 "but not honored by client" ) );
6700 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
6704 #endif /* MBEDTLS_SSL_RENEGOTIATION */
6706 /* Fatal and closure alerts handled by mbedtls_ssl_read_record() */
6707 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
6709 MBEDTLS_SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) );
6710 return( MBEDTLS_ERR_SSL_WANT_READ );
6713 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
6715 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad application data message" ) );
6716 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
6719 ssl->in_offt = ssl->in_msg;
6721 /* We're going to return something now, cancel timer,
6722 * except if handshake (renegotiation) is in progress */
6723 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
6724 ssl_set_timer( ssl, 0 );
6726 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6727 /* If we requested renego but received AppData, resend HelloRequest.
6728 * Do it now, after setting in_offt, to avoid taking this branch
6729 * again if ssl_write_hello_request() returns WANT_WRITE */
6730 #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
6731 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
6732 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
6734 if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
6736 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
6740 #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
6744 n = ( len < ssl->in_msglen )
6745 ? len : ssl->in_msglen;
6747 memcpy( buf, ssl->in_offt, n );
6748 ssl->in_msglen -= n;
6750 if( ssl->in_msglen == 0 )
6751 /* all bytes consumed */
6752 ssl->in_offt = NULL;
6754 /* more data available */
6757 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) );
6763 * Send application data to be encrypted by the SSL layer,
6764 * taking care of max fragment length and buffer size
6766 static int ssl_write_real( mbedtls_ssl_context *ssl,
6767 const unsigned char *buf, size_t len )
6770 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
6771 size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
6775 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6776 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6778 MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) "
6779 "maximum fragment length: %d > %d",
6781 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6787 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
6789 if( ssl->out_left != 0 )
6791 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
6793 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
6799 ssl->out_msglen = len;
6800 ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA;
6801 memcpy( ssl->out_msg, buf, len );
6803 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
6805 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
6810 return( (int) len );
6814 * Write application data, doing 1/n-1 splitting if necessary.
6816 * With non-blocking I/O, ssl_write_real() may return WANT_WRITE,
6817 * then the caller will call us again with the same arguments, so
6818 * remember wether we already did the split or not.
6820 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
6821 static int ssl_write_split( mbedtls_ssl_context *ssl,
6822 const unsigned char *buf, size_t len )
6826 if( ssl->conf->cbc_record_splitting ==
6827 MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ||
6829 ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_1 ||
6830 mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc )
6831 != MBEDTLS_MODE_CBC )
6833 return( ssl_write_real( ssl, buf, len ) );
6836 if( ssl->split_done == 0 )
6838 if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 )
6840 ssl->split_done = 1;
6843 if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 )
6845 ssl->split_done = 0;
6849 #endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */
6852 * Write application data (public-facing wrapper)
6854 int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len )
6858 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) );
6860 if( ssl == NULL || ssl->conf == NULL )
6861 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6863 #if defined(MBEDTLS_SSL_RENEGOTIATION)
6864 if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
6866 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
6871 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6873 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
6875 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
6880 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
6881 ret = ssl_write_split( ssl, buf, len );
6883 ret = ssl_write_real( ssl, buf, len );
6886 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) );
6892 * Notify the peer that the connection is being closed
6894 int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl )
6898 if( ssl == NULL || ssl->conf == NULL )
6899 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6901 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) );
6903 if( ssl->out_left != 0 )
6904 return( mbedtls_ssl_flush_output( ssl ) );
6906 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
6908 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
6909 MBEDTLS_SSL_ALERT_LEVEL_WARNING,
6910 MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 )
6912 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_send_alert_message", ret );
6917 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write close notify" ) );
6922 void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform )
6924 if( transform == NULL )
6927 #if defined(MBEDTLS_ZLIB_SUPPORT)
6928 deflateEnd( &transform->ctx_deflate );
6929 inflateEnd( &transform->ctx_inflate );
6932 mbedtls_cipher_free( &transform->cipher_ctx_enc );
6933 mbedtls_cipher_free( &transform->cipher_ctx_dec );
6935 mbedtls_md_free( &transform->md_ctx_enc );
6936 mbedtls_md_free( &transform->md_ctx_dec );
6938 mbedtls_zeroize( transform, sizeof( mbedtls_ssl_transform ) );
6941 #if defined(MBEDTLS_X509_CRT_PARSE_C)
6942 static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert )
6944 mbedtls_ssl_key_cert *cur = key_cert, *next;
6946 while( cur != NULL )
6949 mbedtls_free( cur );
6953 #endif /* MBEDTLS_X509_CRT_PARSE_C */
6955 void mbedtls_ssl_handshake_free( mbedtls_ssl_handshake_params *handshake )
6957 if( handshake == NULL )
6960 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
6961 defined(MBEDTLS_SSL_PROTO_TLS1_1)
6962 mbedtls_md5_free( &handshake->fin_md5 );
6963 mbedtls_sha1_free( &handshake->fin_sha1 );
6965 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
6966 #if defined(MBEDTLS_SHA256_C)
6967 mbedtls_sha256_free( &handshake->fin_sha256 );
6969 #if defined(MBEDTLS_SHA512_C)
6970 mbedtls_sha512_free( &handshake->fin_sha512 );
6972 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
6974 #if defined(MBEDTLS_DHM_C)
6975 mbedtls_dhm_free( &handshake->dhm_ctx );
6977 #if defined(MBEDTLS_ECDH_C)
6978 mbedtls_ecdh_free( &handshake->ecdh_ctx );
6980 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
6981 mbedtls_ecjpake_free( &handshake->ecjpake_ctx );
6982 #if defined(MBEDTLS_SSL_CLI_C)
6983 mbedtls_free( handshake->ecjpake_cache );
6984 handshake->ecjpake_cache = NULL;
6985 handshake->ecjpake_cache_len = 0;
6989 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
6990 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
6991 /* explicit void pointer cast for buggy MS compiler */
6992 mbedtls_free( (void *) handshake->curves );
6995 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
6996 if( handshake->psk != NULL )
6998 mbedtls_zeroize( handshake->psk, handshake->psk_len );
6999 mbedtls_free( handshake->psk );
7003 #if defined(MBEDTLS_X509_CRT_PARSE_C) && \
7004 defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
7006 * Free only the linked list wrapper, not the keys themselves
7007 * since the belong to the SNI callback
7009 if( handshake->sni_key_cert != NULL )
7011 mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next;
7013 while( cur != NULL )
7016 mbedtls_free( cur );
7020 #endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */
7022 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7023 mbedtls_free( handshake->verify_cookie );
7024 mbedtls_free( handshake->hs_msg );
7025 ssl_flight_free( handshake->flight );
7028 mbedtls_zeroize( handshake, sizeof( mbedtls_ssl_handshake_params ) );
7031 void mbedtls_ssl_session_free( mbedtls_ssl_session *session )
7033 if( session == NULL )
7036 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7037 if( session->peer_cert != NULL )
7039 mbedtls_x509_crt_free( session->peer_cert );
7040 mbedtls_free( session->peer_cert );
7044 #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
7045 mbedtls_free( session->ticket );
7048 mbedtls_zeroize( session, sizeof( mbedtls_ssl_session ) );
7052 * Free an SSL context
7054 void mbedtls_ssl_free( mbedtls_ssl_context *ssl )
7059 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) );
7061 if( ssl->out_buf != NULL )
7063 mbedtls_zeroize( ssl->out_buf, MBEDTLS_SSL_BUFFER_LEN );
7064 mbedtls_free( ssl->out_buf );
7067 if( ssl->in_buf != NULL )
7069 mbedtls_zeroize( ssl->in_buf, MBEDTLS_SSL_BUFFER_LEN );
7070 mbedtls_free( ssl->in_buf );
7073 #if defined(MBEDTLS_ZLIB_SUPPORT)
7074 if( ssl->compress_buf != NULL )
7076 mbedtls_zeroize( ssl->compress_buf, MBEDTLS_SSL_BUFFER_LEN );
7077 mbedtls_free( ssl->compress_buf );
7081 if( ssl->transform )
7083 mbedtls_ssl_transform_free( ssl->transform );
7084 mbedtls_free( ssl->transform );
7087 if( ssl->handshake )
7089 mbedtls_ssl_handshake_free( ssl->handshake );
7090 mbedtls_ssl_transform_free( ssl->transform_negotiate );
7091 mbedtls_ssl_session_free( ssl->session_negotiate );
7093 mbedtls_free( ssl->handshake );
7094 mbedtls_free( ssl->transform_negotiate );
7095 mbedtls_free( ssl->session_negotiate );
7100 mbedtls_ssl_session_free( ssl->session );
7101 mbedtls_free( ssl->session );
7104 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7105 if( ssl->hostname != NULL )
7107 mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) );
7108 mbedtls_free( ssl->hostname );
7112 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
7113 if( mbedtls_ssl_hw_record_finish != NULL )
7115 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) );
7116 mbedtls_ssl_hw_record_finish( ssl );
7120 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
7121 mbedtls_free( ssl->cli_id );
7124 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) );
7126 /* Actually clear after last debug message */
7127 mbedtls_zeroize( ssl, sizeof( mbedtls_ssl_context ) );
7131 * Initialze mbedtls_ssl_config
7133 void mbedtls_ssl_config_init( mbedtls_ssl_config *conf )
7135 memset( conf, 0, sizeof( mbedtls_ssl_config ) );
7138 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7139 static int ssl_preset_default_hashes[] = {
7140 #if defined(MBEDTLS_SHA512_C)
7144 #if defined(MBEDTLS_SHA256_C)
7148 #if defined(MBEDTLS_SHA1_C)
7155 static int ssl_preset_suiteb_ciphersuites[] = {
7156 MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
7157 MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
7161 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7162 static int ssl_preset_suiteb_hashes[] = {
7169 #if defined(MBEDTLS_ECP_C)
7170 static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
7171 MBEDTLS_ECP_DP_SECP256R1,
7172 MBEDTLS_ECP_DP_SECP384R1,
7178 * Load default in mbedtls_ssl_config
7180 int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
7181 int endpoint, int transport, int preset )
7183 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
7187 /* Use the functions here so that they are covered in tests,
7188 * but otherwise access member directly for efficiency */
7189 mbedtls_ssl_conf_endpoint( conf, endpoint );
7190 mbedtls_ssl_conf_transport( conf, transport );
7193 * Things that are common to all presets
7195 #if defined(MBEDTLS_SSL_CLI_C)
7196 if( endpoint == MBEDTLS_SSL_IS_CLIENT )
7198 conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
7199 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
7200 conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED;
7205 #if defined(MBEDTLS_ARC4_C)
7206 conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED;
7209 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
7210 conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
7213 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
7214 conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
7217 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
7218 conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED;
7221 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
7222 conf->f_cookie_write = ssl_cookie_write_dummy;
7223 conf->f_cookie_check = ssl_cookie_check_dummy;
7226 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
7227 conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED;
7230 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7231 conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN;
7232 conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX;
7235 #if defined(MBEDTLS_SSL_RENEGOTIATION)
7236 conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT;
7237 memset( conf->renego_period, 0xFF, 7 );
7238 conf->renego_period[7] = 0x00;
7241 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
7242 if( endpoint == MBEDTLS_SSL_IS_SERVER )
7244 if( ( ret = mbedtls_ssl_conf_dh_param( conf,
7245 MBEDTLS_DHM_RFC5114_MODP_2048_P,
7246 MBEDTLS_DHM_RFC5114_MODP_2048_G ) ) != 0 )
7254 * Preset-specific defaults
7261 case MBEDTLS_SSL_PRESET_SUITEB:
7262 conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
7263 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */
7264 conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
7265 conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
7267 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
7268 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
7269 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
7270 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
7271 ssl_preset_suiteb_ciphersuites;
7273 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7274 conf->cert_profile = &mbedtls_x509_crt_profile_suiteb;
7277 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7278 conf->sig_hashes = ssl_preset_suiteb_hashes;
7281 #if defined(MBEDTLS_ECP_C)
7282 conf->curve_list = ssl_preset_suiteb_curves;
7290 conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
7291 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_1; /* TLS 1.0 */
7292 conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
7293 conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
7295 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7296 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
7297 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2;
7300 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
7301 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
7302 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
7303 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
7304 mbedtls_ssl_list_ciphersuites();
7306 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7307 conf->cert_profile = &mbedtls_x509_crt_profile_default;
7310 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7311 conf->sig_hashes = ssl_preset_default_hashes;
7314 #if defined(MBEDTLS_ECP_C)
7315 conf->curve_list = mbedtls_ecp_grp_id_list();
7318 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
7319 conf->dhm_min_bitlen = 1024;
7327 * Free mbedtls_ssl_config
7329 void mbedtls_ssl_config_free( mbedtls_ssl_config *conf )
7331 #if defined(MBEDTLS_DHM_C)
7332 mbedtls_mpi_free( &conf->dhm_P );
7333 mbedtls_mpi_free( &conf->dhm_G );
7336 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
7337 if( conf->psk != NULL )
7339 mbedtls_zeroize( conf->psk, conf->psk_len );
7340 mbedtls_zeroize( conf->psk_identity, conf->psk_identity_len );
7341 mbedtls_free( conf->psk );
7342 mbedtls_free( conf->psk_identity );
7344 conf->psk_identity_len = 0;
7348 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7349 ssl_key_cert_free( conf->key_cert );
7352 mbedtls_zeroize( conf, sizeof( mbedtls_ssl_config ) );
7355 #if defined(MBEDTLS_PK_C) && \
7356 ( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) )
7358 * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX
7360 unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk )
7362 #if defined(MBEDTLS_RSA_C)
7363 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) )
7364 return( MBEDTLS_SSL_SIG_RSA );
7366 #if defined(MBEDTLS_ECDSA_C)
7367 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) )
7368 return( MBEDTLS_SSL_SIG_ECDSA );
7370 return( MBEDTLS_SSL_SIG_ANON );
7373 mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig )
7377 #if defined(MBEDTLS_RSA_C)
7378 case MBEDTLS_SSL_SIG_RSA:
7379 return( MBEDTLS_PK_RSA );
7381 #if defined(MBEDTLS_ECDSA_C)
7382 case MBEDTLS_SSL_SIG_ECDSA:
7383 return( MBEDTLS_PK_ECDSA );
7386 return( MBEDTLS_PK_NONE );
7389 #endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */
7392 * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX
7394 mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash )
7398 #if defined(MBEDTLS_MD5_C)
7399 case MBEDTLS_SSL_HASH_MD5:
7400 return( MBEDTLS_MD_MD5 );
7402 #if defined(MBEDTLS_SHA1_C)
7403 case MBEDTLS_SSL_HASH_SHA1:
7404 return( MBEDTLS_MD_SHA1 );
7406 #if defined(MBEDTLS_SHA256_C)
7407 case MBEDTLS_SSL_HASH_SHA224:
7408 return( MBEDTLS_MD_SHA224 );
7409 case MBEDTLS_SSL_HASH_SHA256:
7410 return( MBEDTLS_MD_SHA256 );
7412 #if defined(MBEDTLS_SHA512_C)
7413 case MBEDTLS_SSL_HASH_SHA384:
7414 return( MBEDTLS_MD_SHA384 );
7415 case MBEDTLS_SSL_HASH_SHA512:
7416 return( MBEDTLS_MD_SHA512 );
7419 return( MBEDTLS_MD_NONE );
7424 * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX
7426 unsigned char mbedtls_ssl_hash_from_md_alg( int md )
7430 #if defined(MBEDTLS_MD5_C)
7431 case MBEDTLS_MD_MD5:
7432 return( MBEDTLS_SSL_HASH_MD5 );
7434 #if defined(MBEDTLS_SHA1_C)
7435 case MBEDTLS_MD_SHA1:
7436 return( MBEDTLS_SSL_HASH_SHA1 );
7438 #if defined(MBEDTLS_SHA256_C)
7439 case MBEDTLS_MD_SHA224:
7440 return( MBEDTLS_SSL_HASH_SHA224 );
7441 case MBEDTLS_MD_SHA256:
7442 return( MBEDTLS_SSL_HASH_SHA256 );
7444 #if defined(MBEDTLS_SHA512_C)
7445 case MBEDTLS_MD_SHA384:
7446 return( MBEDTLS_SSL_HASH_SHA384 );
7447 case MBEDTLS_MD_SHA512:
7448 return( MBEDTLS_SSL_HASH_SHA512 );
7451 return( MBEDTLS_SSL_HASH_NONE );
7455 #if defined(MBEDTLS_ECP_C)
7457 * Check if a curve proposed by the peer is in our list.
7458 * Return 0 if we're willing to use it, -1 otherwise.
7460 int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id )
7462 const mbedtls_ecp_group_id *gid;
7464 if( ssl->conf->curve_list == NULL )
7467 for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
7468 if( *gid == grp_id )
7473 #endif /* MBEDTLS_ECP_C */
7475 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7477 * Check if a hash proposed by the peer is in our list.
7478 * Return 0 if we're willing to use it, -1 otherwise.
7480 int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl,
7481 mbedtls_md_type_t md )
7485 if( ssl->conf->sig_hashes == NULL )
7488 for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
7489 if( *cur == (int) md )
7494 #endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
7496 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7497 int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert,
7498 const mbedtls_ssl_ciphersuite_t *ciphersuite,
7503 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
7506 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
7507 const char *ext_oid;
7511 #if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \
7512 !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
7514 ((void) cert_endpoint);
7518 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
7519 if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
7521 /* Server part of the key exchange */
7522 switch( ciphersuite->key_exchange )
7524 case MBEDTLS_KEY_EXCHANGE_RSA:
7525 case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
7526 usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
7529 case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
7530 case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
7531 case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
7532 usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
7535 case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
7536 case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
7537 usage = MBEDTLS_X509_KU_KEY_AGREEMENT;
7540 /* Don't use default: we want warnings when adding new values */
7541 case MBEDTLS_KEY_EXCHANGE_NONE:
7542 case MBEDTLS_KEY_EXCHANGE_PSK:
7543 case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
7544 case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
7545 case MBEDTLS_KEY_EXCHANGE_ECJPAKE:
7546 case MBEDTLS_KEY_EXCHANGE_ECDH_ANON:
7552 /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */
7553 usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
7556 if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 )
7558 *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE;
7562 ((void) ciphersuite);
7563 #endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
7565 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
7566 if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
7568 ext_oid = MBEDTLS_OID_SERVER_AUTH;
7569 ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH );
7573 ext_oid = MBEDTLS_OID_CLIENT_AUTH;
7574 ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH );
7577 if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 )
7579 *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE;
7582 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
7586 #endif /* MBEDTLS_X509_CRT_PARSE_C */
7589 * Convert version numbers to/from wire format
7590 * and, for DTLS, to/from TLS equivalent.
7592 * For TLS this is the identity.
7593 * For DTLS, use one complement (v -> 255 - v, and then map as follows:
7594 * 1.0 <-> 3.2 (DTLS 1.0 is based on TLS 1.1)
7595 * 1.x <-> 3.x+1 for x != 0 (DTLS 1.2 based on TLS 1.2)
7597 void mbedtls_ssl_write_version( int major, int minor, int transport,
7598 unsigned char ver[2] )
7600 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7601 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
7603 if( minor == MBEDTLS_SSL_MINOR_VERSION_2 )
7604 --minor; /* DTLS 1.0 stored as TLS 1.1 internally */
7606 ver[0] = (unsigned char)( 255 - ( major - 2 ) );
7607 ver[1] = (unsigned char)( 255 - ( minor - 1 ) );
7614 ver[0] = (unsigned char) major;
7615 ver[1] = (unsigned char) minor;
7619 void mbedtls_ssl_read_version( int *major, int *minor, int transport,
7620 const unsigned char ver[2] )
7622 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7623 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
7625 *major = 255 - ver[0] + 2;
7626 *minor = 255 - ver[1] + 1;
7628 if( *minor == MBEDTLS_SSL_MINOR_VERSION_1 )
7629 ++*minor; /* DTLS 1.0 stored as TLS 1.1 internally */
7641 int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
7643 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
7644 if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
7645 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
7649 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
7650 #if defined(MBEDTLS_MD5_C)
7651 case MBEDTLS_SSL_HASH_MD5:
7652 ssl->handshake->calc_verify = ssl_calc_verify_tls;
7655 #if defined(MBEDTLS_SHA1_C)
7656 case MBEDTLS_SSL_HASH_SHA1:
7657 ssl->handshake->calc_verify = ssl_calc_verify_tls;
7660 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
7661 #if defined(MBEDTLS_SHA512_C)
7662 case MBEDTLS_SSL_HASH_SHA384:
7663 ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384;
7666 #if defined(MBEDTLS_SHA256_C)
7667 case MBEDTLS_SSL_HASH_SHA256:
7668 ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256;
7672 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
7676 #else /* !MBEDTLS_SSL_PROTO_TLS1_2 */
7680 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
7681 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
7684 #endif /* MBEDTLS_SSL_TLS_C */