2 * Copyright 1995-2020 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 *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';
29 c = os_toascii[c]; /* 'A' in ASCII */
32 md5 = ssl_evp_md_fetch(s->ctx->libctx, NID_md5, s->ctx->propq);
33 sha1 = ssl_evp_md_fetch(s->ctx->libctx, NID_sha1, s->ctx->propq);
34 m5 = EVP_MD_CTX_new();
35 s1 = EVP_MD_CTX_new();
36 if (md5 == NULL || sha1 == NULL || m5 == NULL || s1 == NULL) {
37 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_GENERATE_KEY_BLOCK,
38 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, SSL_F_SSL3_GENERATE_KEY_BLOCK,
46 ERR_R_INTERNAL_ERROR);
52 if (!EVP_DigestInit_ex(s1, sha1, NULL)
53 || !EVP_DigestUpdate(s1, buf, k)
54 || !EVP_DigestUpdate(s1, s->session->master_key,
55 s->session->master_key_length)
56 || !EVP_DigestUpdate(s1, s->s3.server_random, SSL3_RANDOM_SIZE)
57 || !EVP_DigestUpdate(s1, s->s3.client_random, SSL3_RANDOM_SIZE)
58 || !EVP_DigestFinal_ex(s1, smd, NULL)
59 || !EVP_DigestInit_ex(m5, md5, NULL)
60 || !EVP_DigestUpdate(m5, s->session->master_key,
61 s->session->master_key_length)
62 || !EVP_DigestUpdate(m5, smd, SHA_DIGEST_LENGTH)) {
63 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_GENERATE_KEY_BLOCK,
64 ERR_R_INTERNAL_ERROR);
67 if ((int)(i + MD5_DIGEST_LENGTH) > num) {
68 if (!EVP_DigestFinal_ex(m5, smd, NULL)) {
69 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
70 SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
73 memcpy(km, smd, (num - i));
75 if (!EVP_DigestFinal_ex(m5, km, NULL)) {
76 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
77 SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
82 km += MD5_DIGEST_LENGTH;
84 OPENSSL_cleanse(smd, sizeof(smd));
90 ssl_evp_md_free(sha1);
94 int ssl3_change_cipher_state(SSL *s, int which)
96 unsigned char *p, *mac_secret;
97 unsigned char *ms, *key, *iv;
100 #ifndef OPENSSL_NO_COMP
105 size_t n, i, j, k, cl;
108 c = s->s3.tmp.new_sym_enc;
109 m = s->s3.tmp.new_hash;
110 /* m == NULL will lead to a crash later */
111 if (!ossl_assert(m != NULL)) {
112 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
113 ERR_R_INTERNAL_ERROR);
116 #ifndef OPENSSL_NO_COMP
117 if (s->s3.tmp.new_compression == NULL)
120 comp = s->s3.tmp.new_compression->method;
123 if (which & SSL3_CC_READ) {
124 if (s->enc_read_ctx != NULL) {
126 } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
127 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
128 ERR_R_MALLOC_FAILURE);
132 * make sure it's initialised in case we exit later with an error
134 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
136 dd = s->enc_read_ctx;
138 if (ssl_replace_hash(&s->read_hash, m) == NULL) {
139 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
140 ERR_R_INTERNAL_ERROR);
143 #ifndef OPENSSL_NO_COMP
145 COMP_CTX_free(s->expand);
148 s->expand = COMP_CTX_new(comp);
149 if (s->expand == NULL) {
150 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
151 SSL_F_SSL3_CHANGE_CIPHER_STATE,
152 SSL_R_COMPRESSION_LIBRARY_ERROR);
157 RECORD_LAYER_reset_read_sequence(&s->rlayer);
158 mac_secret = &(s->s3.read_mac_secret[0]);
160 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
161 if (s->enc_write_ctx != NULL) {
163 } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
164 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
165 ERR_R_MALLOC_FAILURE);
169 * make sure it's initialised in case we exit later with an error
171 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
173 dd = s->enc_write_ctx;
174 if (ssl_replace_hash(&s->write_hash, m) == NULL) {
175 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
176 ERR_R_MALLOC_FAILURE);
179 #ifndef OPENSSL_NO_COMP
181 COMP_CTX_free(s->compress);
184 s->compress = COMP_CTX_new(comp);
185 if (s->compress == NULL) {
186 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
187 SSL_F_SSL3_CHANGE_CIPHER_STATE,
188 SSL_R_COMPRESSION_LIBRARY_ERROR);
193 RECORD_LAYER_reset_write_sequence(&s->rlayer);
194 mac_secret = &(s->s3.write_mac_secret[0]);
198 EVP_CIPHER_CTX_reset(dd);
200 p = s->s3.tmp.key_block;
201 mdi = EVP_MD_size(m);
203 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
204 ERR_R_INTERNAL_ERROR);
208 cl = EVP_CIPHER_key_length(c);
210 k = EVP_CIPHER_iv_length(c);
211 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
212 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
229 if (n > s->s3.tmp.key_block_length) {
230 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
231 ERR_R_INTERNAL_ERROR);
235 memcpy(mac_secret, ms, i);
237 if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
238 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
239 ERR_R_INTERNAL_ERROR);
243 if (EVP_CIPHER_provider(c) != NULL
244 && !tls_provider_set_tls_params(s, dd, c, m)) {
245 /* SSLfatal already called */
249 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
255 int ssl3_setup_key_block(SSL *s)
264 if (s->s3.tmp.key_block_length != 0)
267 if (!ssl_cipher_get_evp(s->ctx, s->session, &c, &hash, NULL, NULL, &comp,
269 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_SETUP_KEY_BLOCK,
270 SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
274 ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
275 s->s3.tmp.new_sym_enc = c;
276 ssl_evp_md_free(s->s3.tmp.new_hash);
277 s->s3.tmp.new_hash = hash;
278 #ifdef OPENSSL_NO_COMP
279 s->s3.tmp.new_compression = NULL;
281 s->s3.tmp.new_compression = comp;
284 num = EVP_MD_size(hash);
288 num = EVP_CIPHER_key_length(c) + num + EVP_CIPHER_iv_length(c);
291 ssl3_cleanup_key_block(s);
293 if ((p = OPENSSL_malloc(num)) == NULL) {
294 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_SETUP_KEY_BLOCK,
295 ERR_R_MALLOC_FAILURE);
299 s->s3.tmp.key_block_length = num;
300 s->s3.tmp.key_block = p;
302 /* Calls SSLfatal() as required */
303 ret = ssl3_generate_key_block(s, p, num);
305 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
307 * enable vulnerability countermeasure for CBC ciphers with known-IV
308 * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
310 s->s3.need_empty_fragments = 1;
312 if (s->session->cipher != NULL) {
313 if (s->session->cipher->algorithm_enc == SSL_eNULL)
314 s->s3.need_empty_fragments = 0;
316 #ifndef OPENSSL_NO_RC4
317 if (s->session->cipher->algorithm_enc == SSL_RC4)
318 s->s3.need_empty_fragments = 0;
326 void ssl3_cleanup_key_block(SSL *s)
328 OPENSSL_clear_free(s->s3.tmp.key_block, s->s3.tmp.key_block_length);
329 s->s3.tmp.key_block = NULL;
330 s->s3.tmp.key_block_length = 0;
333 int ssl3_init_finished_mac(SSL *s)
335 BIO *buf = BIO_new(BIO_s_mem());
338 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_INIT_FINISHED_MAC,
339 ERR_R_MALLOC_FAILURE);
342 ssl3_free_digest_list(s);
343 s->s3.handshake_buffer = buf;
344 (void)BIO_set_close(s->s3.handshake_buffer, BIO_CLOSE);
349 * Free digest list. Also frees handshake buffer since they are always freed
353 void ssl3_free_digest_list(SSL *s)
355 BIO_free(s->s3.handshake_buffer);
356 s->s3.handshake_buffer = NULL;
357 EVP_MD_CTX_free(s->s3.handshake_dgst);
358 s->s3.handshake_dgst = NULL;
361 int ssl3_finish_mac(SSL *s, const unsigned char *buf, size_t len)
365 if (s->s3.handshake_dgst == NULL) {
366 /* Note: this writes to a memory BIO so a failure is a fatal error */
368 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINISH_MAC,
369 SSL_R_OVERFLOW_ERROR);
372 ret = BIO_write(s->s3.handshake_buffer, (void *)buf, (int)len);
373 if (ret <= 0 || ret != (int)len) {
374 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINISH_MAC,
375 ERR_R_INTERNAL_ERROR);
379 ret = EVP_DigestUpdate(s->s3.handshake_dgst, buf, len);
381 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINISH_MAC,
382 ERR_R_INTERNAL_ERROR);
389 int ssl3_digest_cached_records(SSL *s, int keep)
395 if (s->s3.handshake_dgst == NULL) {
396 hdatalen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
398 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_DIGEST_CACHED_RECORDS,
399 SSL_R_BAD_HANDSHAKE_LENGTH);
403 s->s3.handshake_dgst = EVP_MD_CTX_new();
404 if (s->s3.handshake_dgst == NULL) {
405 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_DIGEST_CACHED_RECORDS,
406 ERR_R_MALLOC_FAILURE);
410 md = ssl_handshake_md(s);
411 if (md == NULL || !EVP_DigestInit_ex(s->s3.handshake_dgst, md, NULL)
412 || !EVP_DigestUpdate(s->s3.handshake_dgst, hdata, hdatalen)) {
413 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_DIGEST_CACHED_RECORDS,
414 ERR_R_INTERNAL_ERROR);
419 BIO_free(s->s3.handshake_buffer);
420 s->s3.handshake_buffer = NULL;
426 void ssl3_digest_master_key_set_params(const SSL_SESSION *session,
430 params[n++] = OSSL_PARAM_construct_octet_string(OSSL_DIGEST_PARAM_SSL3_MS,
431 (void *)session->master_key,
432 session->master_key_length);
433 params[n++] = OSSL_PARAM_construct_end();
436 size_t ssl3_final_finish_mac(SSL *s, const char *sender, size_t len,
440 EVP_MD_CTX *ctx = NULL;
442 if (!ssl3_digest_cached_records(s, 0)) {
443 /* SSLfatal() already called */
447 if (EVP_MD_CTX_type(s->s3.handshake_dgst) != NID_md5_sha1) {
448 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
449 SSL_R_NO_REQUIRED_DIGEST);
453 ctx = EVP_MD_CTX_new();
455 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
456 ERR_R_MALLOC_FAILURE);
459 if (!EVP_MD_CTX_copy_ex(ctx, s->s3.handshake_dgst)) {
460 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
461 ERR_R_INTERNAL_ERROR);
466 ret = EVP_MD_CTX_size(ctx);
468 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
469 ERR_R_INTERNAL_ERROR);
474 if (sender != NULL) {
475 OSSL_PARAM digest_cmd_params[3];
477 ssl3_digest_master_key_set_params(s->session, digest_cmd_params);
479 if (EVP_DigestUpdate(ctx, sender, len) <= 0
480 || EVP_MD_CTX_set_params(ctx, digest_cmd_params) <= 0
481 || EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
482 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
483 ERR_R_INTERNAL_ERROR);
489 EVP_MD_CTX_free(ctx);
494 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
495 size_t len, size_t *secret_size)
497 static const unsigned char *salt[3] = {
498 #ifndef CHARSET_EBCDIC
499 (const unsigned char *)"A",
500 (const unsigned char *)"BB",
501 (const unsigned char *)"CCC",
503 (const unsigned char *)"\x41",
504 (const unsigned char *)"\x42\x42",
505 (const unsigned char *)"\x43\x43\x43",
508 unsigned char buf[EVP_MAX_MD_SIZE];
509 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
512 size_t ret_secret_size = 0;
515 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_GENERATE_MASTER_SECRET,
516 ERR_R_MALLOC_FAILURE);
519 for (i = 0; i < 3; i++) {
520 if (EVP_DigestInit_ex(ctx, s->ctx->sha1, NULL) <= 0
521 || EVP_DigestUpdate(ctx, salt[i],
522 strlen((const char *)salt[i])) <= 0
523 || EVP_DigestUpdate(ctx, p, len) <= 0
524 || EVP_DigestUpdate(ctx, &(s->s3.client_random[0]),
525 SSL3_RANDOM_SIZE) <= 0
526 || EVP_DigestUpdate(ctx, &(s->s3.server_random[0]),
527 SSL3_RANDOM_SIZE) <= 0
528 /* TODO(size_t) : convert me */
529 || EVP_DigestFinal_ex(ctx, buf, &n) <= 0
530 || EVP_DigestInit_ex(ctx, s->ctx->md5, NULL) <= 0
531 || EVP_DigestUpdate(ctx, p, len) <= 0
532 || EVP_DigestUpdate(ctx, buf, n) <= 0
533 || EVP_DigestFinal_ex(ctx, out, &n) <= 0) {
534 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
535 SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_INTERNAL_ERROR);
540 ret_secret_size += n;
542 EVP_MD_CTX_free(ctx);
544 OPENSSL_cleanse(buf, sizeof(buf));
546 *secret_size = ret_secret_size;
550 int ssl3_alert_code(int code)
553 case SSL_AD_CLOSE_NOTIFY:
554 return SSL3_AD_CLOSE_NOTIFY;
555 case SSL_AD_UNEXPECTED_MESSAGE:
556 return SSL3_AD_UNEXPECTED_MESSAGE;
557 case SSL_AD_BAD_RECORD_MAC:
558 return SSL3_AD_BAD_RECORD_MAC;
559 case SSL_AD_DECRYPTION_FAILED:
560 return SSL3_AD_BAD_RECORD_MAC;
561 case SSL_AD_RECORD_OVERFLOW:
562 return SSL3_AD_BAD_RECORD_MAC;
563 case SSL_AD_DECOMPRESSION_FAILURE:
564 return SSL3_AD_DECOMPRESSION_FAILURE;
565 case SSL_AD_HANDSHAKE_FAILURE:
566 return SSL3_AD_HANDSHAKE_FAILURE;
567 case SSL_AD_NO_CERTIFICATE:
568 return SSL3_AD_NO_CERTIFICATE;
569 case SSL_AD_BAD_CERTIFICATE:
570 return SSL3_AD_BAD_CERTIFICATE;
571 case SSL_AD_UNSUPPORTED_CERTIFICATE:
572 return SSL3_AD_UNSUPPORTED_CERTIFICATE;
573 case SSL_AD_CERTIFICATE_REVOKED:
574 return SSL3_AD_CERTIFICATE_REVOKED;
575 case SSL_AD_CERTIFICATE_EXPIRED:
576 return SSL3_AD_CERTIFICATE_EXPIRED;
577 case SSL_AD_CERTIFICATE_UNKNOWN:
578 return SSL3_AD_CERTIFICATE_UNKNOWN;
579 case SSL_AD_ILLEGAL_PARAMETER:
580 return SSL3_AD_ILLEGAL_PARAMETER;
581 case SSL_AD_UNKNOWN_CA:
582 return SSL3_AD_BAD_CERTIFICATE;
583 case SSL_AD_ACCESS_DENIED:
584 return SSL3_AD_HANDSHAKE_FAILURE;
585 case SSL_AD_DECODE_ERROR:
586 return SSL3_AD_HANDSHAKE_FAILURE;
587 case SSL_AD_DECRYPT_ERROR:
588 return SSL3_AD_HANDSHAKE_FAILURE;
589 case SSL_AD_EXPORT_RESTRICTION:
590 return SSL3_AD_HANDSHAKE_FAILURE;
591 case SSL_AD_PROTOCOL_VERSION:
592 return SSL3_AD_HANDSHAKE_FAILURE;
593 case SSL_AD_INSUFFICIENT_SECURITY:
594 return SSL3_AD_HANDSHAKE_FAILURE;
595 case SSL_AD_INTERNAL_ERROR:
596 return SSL3_AD_HANDSHAKE_FAILURE;
597 case SSL_AD_USER_CANCELLED:
598 return SSL3_AD_HANDSHAKE_FAILURE;
599 case SSL_AD_NO_RENEGOTIATION:
600 return -1; /* Don't send it :-) */
601 case SSL_AD_UNSUPPORTED_EXTENSION:
602 return SSL3_AD_HANDSHAKE_FAILURE;
603 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
604 return SSL3_AD_HANDSHAKE_FAILURE;
605 case SSL_AD_UNRECOGNIZED_NAME:
606 return SSL3_AD_HANDSHAKE_FAILURE;
607 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
608 return SSL3_AD_HANDSHAKE_FAILURE;
609 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
610 return SSL3_AD_HANDSHAKE_FAILURE;
611 case SSL_AD_UNKNOWN_PSK_IDENTITY:
612 return TLS1_AD_UNKNOWN_PSK_IDENTITY;
613 case SSL_AD_INAPPROPRIATE_FALLBACK:
614 return TLS1_AD_INAPPROPRIATE_FALLBACK;
615 case SSL_AD_NO_APPLICATION_PROTOCOL:
616 return TLS1_AD_NO_APPLICATION_PROTOCOL;
617 case SSL_AD_CERTIFICATE_REQUIRED:
618 return SSL_AD_HANDSHAKE_FAILURE;