2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright 2005 Nokia. All rights reserved.
5 * Licensed under the Apache License 2.0 (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
12 #include "ssl_local.h"
13 #include <openssl/evp.h>
14 #include <openssl/md5.h>
15 #include <openssl/core_names.h>
16 #include "internal/cryptlib.h"
18 static int ssl3_generate_key_block(SSL_CONNECTION *s, unsigned char *km, int num)
20 const EVP_MD *md5 = NULL, *sha1 = NULL;
23 unsigned char buf[16], smd[SHA_DIGEST_LENGTH];
24 unsigned char c = 'A';
27 SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
30 c = os_toascii[c]; /* 'A' in ASCII */
33 md5 = ssl_evp_md_fetch(sctx->libctx, NID_md5, sctx->propq);
34 sha1 = ssl_evp_md_fetch(sctx->libctx, NID_sha1, sctx->propq);
35 m5 = EVP_MD_CTX_new();
36 s1 = EVP_MD_CTX_new();
37 if (md5 == NULL || sha1 == NULL || m5 == NULL || s1 == NULL) {
38 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
41 for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) {
43 if (k > sizeof(buf)) {
44 /* bug: 'buf' is too small for this ciphersuite */
45 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
51 if (!EVP_DigestInit_ex(s1, sha1, NULL)
52 || !EVP_DigestUpdate(s1, buf, k)
53 || !EVP_DigestUpdate(s1, s->session->master_key,
54 s->session->master_key_length)
55 || !EVP_DigestUpdate(s1, s->s3.server_random, SSL3_RANDOM_SIZE)
56 || !EVP_DigestUpdate(s1, s->s3.client_random, SSL3_RANDOM_SIZE)
57 || !EVP_DigestFinal_ex(s1, smd, NULL)
58 || !EVP_DigestInit_ex(m5, md5, NULL)
59 || !EVP_DigestUpdate(m5, s->session->master_key,
60 s->session->master_key_length)
61 || !EVP_DigestUpdate(m5, smd, SHA_DIGEST_LENGTH)) {
62 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
65 if ((int)(i + MD5_DIGEST_LENGTH) > num) {
66 if (!EVP_DigestFinal_ex(m5, smd, NULL)) {
67 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
70 memcpy(km, smd, (num - i));
72 if (!EVP_DigestFinal_ex(m5, km, NULL)) {
73 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
78 km += MD5_DIGEST_LENGTH;
80 OPENSSL_cleanse(smd, sizeof(smd));
86 ssl_evp_md_free(sha1);
90 int ssl3_change_cipher_state(SSL_CONNECTION *s, int which)
92 unsigned char *p, *mac_secret;
93 unsigned char *ms, *key, *iv;
96 #ifndef OPENSSL_NO_COMP
101 size_t n, i, j, k, cl;
104 c = s->s3.tmp.new_sym_enc;
105 m = s->s3.tmp.new_hash;
106 /* m == NULL will lead to a crash later */
107 if (!ossl_assert(m != NULL)) {
108 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
111 #ifndef OPENSSL_NO_COMP
112 if (s->s3.tmp.new_compression == NULL)
115 comp = s->s3.tmp.new_compression->method;
118 if (which & SSL3_CC_READ) {
119 if (s->enc_read_ctx != NULL) {
121 } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
122 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
126 * make sure it's initialised in case we exit later with an error
128 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
130 dd = s->enc_read_ctx;
132 if (ssl_replace_hash(&s->read_hash, m) == NULL) {
133 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
136 #ifndef OPENSSL_NO_COMP
138 COMP_CTX_free(s->expand);
141 s->expand = COMP_CTX_new(comp);
142 if (s->expand == NULL) {
143 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
144 SSL_R_COMPRESSION_LIBRARY_ERROR);
149 RECORD_LAYER_reset_read_sequence(&s->rlayer);
150 mac_secret = &(s->s3.read_mac_secret[0]);
152 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
153 if (s->enc_write_ctx != NULL) {
155 } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
156 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
160 * make sure it's initialised in case we exit later with an error
162 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
164 dd = s->enc_write_ctx;
165 if (ssl_replace_hash(&s->write_hash, m) == NULL) {
166 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
169 #ifndef OPENSSL_NO_COMP
171 COMP_CTX_free(s->compress);
174 s->compress = COMP_CTX_new(comp);
175 if (s->compress == NULL) {
176 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
177 SSL_R_COMPRESSION_LIBRARY_ERROR);
182 RECORD_LAYER_reset_write_sequence(&s->rlayer);
183 mac_secret = &(s->s3.write_mac_secret[0]);
187 EVP_CIPHER_CTX_reset(dd);
189 p = s->s3.tmp.key_block;
190 mdi = EVP_MD_get_size(m);
192 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
196 cl = EVP_CIPHER_get_key_length(c);
198 k = EVP_CIPHER_get_iv_length(c);
199 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
200 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
217 if (n > s->s3.tmp.key_block_length) {
218 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
222 memcpy(mac_secret, ms, i);
224 if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
225 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
229 if (EVP_CIPHER_get0_provider(c) != NULL
230 && !tls_provider_set_tls_params(s, dd, c, m)) {
231 /* SSLfatal already called */
235 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
241 int ssl3_setup_key_block(SSL_CONNECTION *s)
250 if (s->s3.tmp.key_block_length != 0)
253 if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
254 NULL, NULL, &comp, 0)) {
255 /* Error is already recorded */
256 SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
260 ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
261 s->s3.tmp.new_sym_enc = c;
262 ssl_evp_md_free(s->s3.tmp.new_hash);
263 s->s3.tmp.new_hash = hash;
264 #ifdef OPENSSL_NO_COMP
265 s->s3.tmp.new_compression = NULL;
267 s->s3.tmp.new_compression = comp;
270 num = EVP_MD_get_size(hash);
274 num = EVP_CIPHER_get_key_length(c) + num + EVP_CIPHER_get_iv_length(c);
277 ssl3_cleanup_key_block(s);
279 if ((p = OPENSSL_malloc(num)) == NULL) {
280 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
284 s->s3.tmp.key_block_length = num;
285 s->s3.tmp.key_block = p;
287 /* Calls SSLfatal() as required */
288 ret = ssl3_generate_key_block(s, p, num);
290 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
292 * enable vulnerability countermeasure for CBC ciphers with known-IV
293 * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
295 s->s3.need_empty_fragments = 1;
297 if (s->session->cipher != NULL) {
298 if (s->session->cipher->algorithm_enc == SSL_eNULL)
299 s->s3.need_empty_fragments = 0;
301 if (s->session->cipher->algorithm_enc == SSL_RC4)
302 s->s3.need_empty_fragments = 0;
309 void ssl3_cleanup_key_block(SSL_CONNECTION *s)
311 OPENSSL_clear_free(s->s3.tmp.key_block, s->s3.tmp.key_block_length);
312 s->s3.tmp.key_block = NULL;
313 s->s3.tmp.key_block_length = 0;
316 int ssl3_init_finished_mac(SSL_CONNECTION *s)
318 BIO *buf = BIO_new(BIO_s_mem());
321 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
324 ssl3_free_digest_list(s);
325 s->s3.handshake_buffer = buf;
326 (void)BIO_set_close(s->s3.handshake_buffer, BIO_CLOSE);
331 * Free digest list. Also frees handshake buffer since they are always freed
335 void ssl3_free_digest_list(SSL_CONNECTION *s)
337 BIO_free(s->s3.handshake_buffer);
338 s->s3.handshake_buffer = NULL;
339 EVP_MD_CTX_free(s->s3.handshake_dgst);
340 s->s3.handshake_dgst = NULL;
343 int ssl3_finish_mac(SSL_CONNECTION *s, const unsigned char *buf, size_t len)
347 if (s->s3.handshake_dgst == NULL) {
348 /* Note: this writes to a memory BIO so a failure is a fatal error */
350 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_OVERFLOW_ERROR);
353 ret = BIO_write(s->s3.handshake_buffer, (void *)buf, (int)len);
354 if (ret <= 0 || ret != (int)len) {
355 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
359 ret = EVP_DigestUpdate(s->s3.handshake_dgst, buf, len);
361 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
368 int ssl3_digest_cached_records(SSL_CONNECTION *s, int keep)
374 if (s->s3.handshake_dgst == NULL) {
375 hdatalen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
377 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
381 s->s3.handshake_dgst = EVP_MD_CTX_new();
382 if (s->s3.handshake_dgst == NULL) {
383 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
387 md = ssl_handshake_md(s);
389 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
390 SSL_R_NO_SUITABLE_DIGEST_ALGORITHM);
393 if (!EVP_DigestInit_ex(s->s3.handshake_dgst, md, NULL)
394 || !EVP_DigestUpdate(s->s3.handshake_dgst, hdata, hdatalen)) {
395 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
400 BIO_free(s->s3.handshake_buffer);
401 s->s3.handshake_buffer = NULL;
407 void ssl3_digest_master_key_set_params(const SSL_SESSION *session,
411 params[n++] = OSSL_PARAM_construct_octet_string(OSSL_DIGEST_PARAM_SSL3_MS,
412 (void *)session->master_key,
413 session->master_key_length);
414 params[n++] = OSSL_PARAM_construct_end();
417 size_t ssl3_final_finish_mac(SSL_CONNECTION *s, const char *sender, size_t len,
421 EVP_MD_CTX *ctx = NULL;
423 if (!ssl3_digest_cached_records(s, 0)) {
424 /* SSLfatal() already called */
428 if (EVP_MD_CTX_get_type(s->s3.handshake_dgst) != NID_md5_sha1) {
429 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_NO_REQUIRED_DIGEST);
433 ctx = EVP_MD_CTX_new();
435 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
438 if (!EVP_MD_CTX_copy_ex(ctx, s->s3.handshake_dgst)) {
439 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
444 ret = EVP_MD_CTX_get_size(ctx);
446 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
451 if (sender != NULL) {
452 OSSL_PARAM digest_cmd_params[3];
454 ssl3_digest_master_key_set_params(s->session, digest_cmd_params);
456 if (EVP_DigestUpdate(ctx, sender, len) <= 0
457 || EVP_MD_CTX_set_params(ctx, digest_cmd_params) <= 0
458 || EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
459 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
465 EVP_MD_CTX_free(ctx);
470 int ssl3_generate_master_secret(SSL_CONNECTION *s, unsigned char *out,
472 size_t len, size_t *secret_size)
474 static const unsigned char *salt[3] = {
475 #ifndef CHARSET_EBCDIC
476 (const unsigned char *)"A",
477 (const unsigned char *)"BB",
478 (const unsigned char *)"CCC",
480 (const unsigned char *)"\x41",
481 (const unsigned char *)"\x42\x42",
482 (const unsigned char *)"\x43\x43\x43",
485 unsigned char buf[EVP_MAX_MD_SIZE];
486 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
489 size_t ret_secret_size = 0;
492 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
495 for (i = 0; i < 3; i++) {
496 if (EVP_DigestInit_ex(ctx, SSL_CONNECTION_GET_CTX(s)->sha1, NULL) <= 0
497 || EVP_DigestUpdate(ctx, salt[i],
498 strlen((const char *)salt[i])) <= 0
499 || EVP_DigestUpdate(ctx, p, len) <= 0
500 || EVP_DigestUpdate(ctx, &(s->s3.client_random[0]),
501 SSL3_RANDOM_SIZE) <= 0
502 || EVP_DigestUpdate(ctx, &(s->s3.server_random[0]),
503 SSL3_RANDOM_SIZE) <= 0
504 || EVP_DigestFinal_ex(ctx, buf, &n) <= 0
505 || EVP_DigestInit_ex(ctx, SSL_CONNECTION_GET_CTX(s)->md5, NULL) <= 0
506 || EVP_DigestUpdate(ctx, p, len) <= 0
507 || EVP_DigestUpdate(ctx, buf, n) <= 0
508 || EVP_DigestFinal_ex(ctx, out, &n) <= 0) {
509 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
514 ret_secret_size += n;
516 EVP_MD_CTX_free(ctx);
518 OPENSSL_cleanse(buf, sizeof(buf));
520 *secret_size = ret_secret_size;
524 int ssl3_alert_code(int code)
527 case SSL_AD_CLOSE_NOTIFY:
528 return SSL3_AD_CLOSE_NOTIFY;
529 case SSL_AD_UNEXPECTED_MESSAGE:
530 return SSL3_AD_UNEXPECTED_MESSAGE;
531 case SSL_AD_BAD_RECORD_MAC:
532 return SSL3_AD_BAD_RECORD_MAC;
533 case SSL_AD_DECRYPTION_FAILED:
534 return SSL3_AD_BAD_RECORD_MAC;
535 case SSL_AD_RECORD_OVERFLOW:
536 return SSL3_AD_BAD_RECORD_MAC;
537 case SSL_AD_DECOMPRESSION_FAILURE:
538 return SSL3_AD_DECOMPRESSION_FAILURE;
539 case SSL_AD_HANDSHAKE_FAILURE:
540 return SSL3_AD_HANDSHAKE_FAILURE;
541 case SSL_AD_NO_CERTIFICATE:
542 return SSL3_AD_NO_CERTIFICATE;
543 case SSL_AD_BAD_CERTIFICATE:
544 return SSL3_AD_BAD_CERTIFICATE;
545 case SSL_AD_UNSUPPORTED_CERTIFICATE:
546 return SSL3_AD_UNSUPPORTED_CERTIFICATE;
547 case SSL_AD_CERTIFICATE_REVOKED:
548 return SSL3_AD_CERTIFICATE_REVOKED;
549 case SSL_AD_CERTIFICATE_EXPIRED:
550 return SSL3_AD_CERTIFICATE_EXPIRED;
551 case SSL_AD_CERTIFICATE_UNKNOWN:
552 return SSL3_AD_CERTIFICATE_UNKNOWN;
553 case SSL_AD_ILLEGAL_PARAMETER:
554 return SSL3_AD_ILLEGAL_PARAMETER;
555 case SSL_AD_UNKNOWN_CA:
556 return SSL3_AD_BAD_CERTIFICATE;
557 case SSL_AD_ACCESS_DENIED:
558 return SSL3_AD_HANDSHAKE_FAILURE;
559 case SSL_AD_DECODE_ERROR:
560 return SSL3_AD_HANDSHAKE_FAILURE;
561 case SSL_AD_DECRYPT_ERROR:
562 return SSL3_AD_HANDSHAKE_FAILURE;
563 case SSL_AD_EXPORT_RESTRICTION:
564 return SSL3_AD_HANDSHAKE_FAILURE;
565 case SSL_AD_PROTOCOL_VERSION:
566 return SSL3_AD_HANDSHAKE_FAILURE;
567 case SSL_AD_INSUFFICIENT_SECURITY:
568 return SSL3_AD_HANDSHAKE_FAILURE;
569 case SSL_AD_INTERNAL_ERROR:
570 return SSL3_AD_HANDSHAKE_FAILURE;
571 case SSL_AD_USER_CANCELLED:
572 return SSL3_AD_HANDSHAKE_FAILURE;
573 case SSL_AD_NO_RENEGOTIATION:
574 return -1; /* Don't send it :-) */
575 case SSL_AD_UNSUPPORTED_EXTENSION:
576 return SSL3_AD_HANDSHAKE_FAILURE;
577 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
578 return SSL3_AD_HANDSHAKE_FAILURE;
579 case SSL_AD_UNRECOGNIZED_NAME:
580 return SSL3_AD_HANDSHAKE_FAILURE;
581 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
582 return SSL3_AD_HANDSHAKE_FAILURE;
583 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
584 return SSL3_AD_HANDSHAKE_FAILURE;
585 case SSL_AD_UNKNOWN_PSK_IDENTITY:
586 return TLS1_AD_UNKNOWN_PSK_IDENTITY;
587 case SSL_AD_INAPPROPRIATE_FALLBACK:
588 return TLS1_AD_INAPPROPRIATE_FALLBACK;
589 case SSL_AD_NO_APPLICATION_PROTOCOL:
590 return TLS1_AD_NO_APPLICATION_PROTOCOL;
591 case SSL_AD_CERTIFICATE_REQUIRED:
592 return SSL_AD_HANDSHAKE_FAILURE;
593 case TLS13_AD_MISSING_EXTENSION:
594 return SSL_AD_HANDSHAKE_FAILURE;