2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright 2005 Nokia. All rights reserved.
5 * Licensed under the OpenSSL license (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
13 #include <openssl/evp.h>
14 #include <openssl/md5.h>
15 #include "internal/cryptlib.h"
17 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
21 unsigned char buf[16], smd[SHA_DIGEST_LENGTH];
22 unsigned char c = 'A';
27 c = os_toascii[c]; /* 'A' in ASCII */
30 m5 = EVP_MD_CTX_new();
31 s1 = EVP_MD_CTX_new();
32 if (m5 == NULL || s1 == NULL) {
33 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_GENERATE_KEY_BLOCK,
34 ERR_R_MALLOC_FAILURE);
37 EVP_MD_CTX_set_flags(m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
38 for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) {
40 if (k > sizeof(buf)) {
41 /* bug: 'buf' is too small for this ciphersuite */
42 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_GENERATE_KEY_BLOCK,
43 ERR_R_INTERNAL_ERROR);
47 for (j = 0; j < k; j++)
50 if (!EVP_DigestInit_ex(s1, EVP_sha1(), NULL)
51 || !EVP_DigestUpdate(s1, buf, k)
52 || !EVP_DigestUpdate(s1, s->session->master_key,
53 s->session->master_key_length)
54 || !EVP_DigestUpdate(s1, s->s3->server_random, SSL3_RANDOM_SIZE)
55 || !EVP_DigestUpdate(s1, s->s3->client_random, SSL3_RANDOM_SIZE)
56 || !EVP_DigestFinal_ex(s1, smd, NULL)
57 || !EVP_DigestInit_ex(m5, EVP_md5(), NULL)
58 || !EVP_DigestUpdate(m5, s->session->master_key,
59 s->session->master_key_length)
60 || !EVP_DigestUpdate(m5, smd, SHA_DIGEST_LENGTH)) {
61 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_GENERATE_KEY_BLOCK,
62 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,
68 SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
71 memcpy(km, smd, (num - i));
73 if (!EVP_DigestFinal_ex(m5, km, NULL)) {
74 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
75 SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
80 km += MD5_DIGEST_LENGTH;
82 OPENSSL_cleanse(smd, sizeof(smd));
90 int ssl3_change_cipher_state(SSL *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, SSL_F_SSL3_CHANGE_CIPHER_STATE,
109 ERR_R_INTERNAL_ERROR);
112 #ifndef OPENSSL_NO_COMP
113 if (s->s3->tmp.new_compression == NULL)
116 comp = s->s3->tmp.new_compression->method;
119 if (which & SSL3_CC_READ) {
120 if (s->enc_read_ctx != NULL) {
122 } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
123 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
124 ERR_R_MALLOC_FAILURE);
128 * make sure it's initialised in case we exit later with an error
130 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
132 dd = s->enc_read_ctx;
134 if (ssl_replace_hash(&s->read_hash, m) == NULL) {
135 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
136 ERR_R_INTERNAL_ERROR);
139 #ifndef OPENSSL_NO_COMP
141 COMP_CTX_free(s->expand);
144 s->expand = COMP_CTX_new(comp);
145 if (s->expand == NULL) {
146 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
147 SSL_F_SSL3_CHANGE_CIPHER_STATE,
148 SSL_R_COMPRESSION_LIBRARY_ERROR);
153 RECORD_LAYER_reset_read_sequence(&s->rlayer);
154 mac_secret = &(s->s3->read_mac_secret[0]);
156 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
157 if (s->enc_write_ctx != NULL) {
159 } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
160 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
161 ERR_R_MALLOC_FAILURE);
165 * make sure it's initialised in case we exit later with an error
167 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
169 dd = s->enc_write_ctx;
170 if (ssl_replace_hash(&s->write_hash, m) == NULL) {
171 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
172 ERR_R_MALLOC_FAILURE);
175 #ifndef OPENSSL_NO_COMP
177 COMP_CTX_free(s->compress);
180 s->compress = COMP_CTX_new(comp);
181 if (s->compress == NULL) {
182 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
183 SSL_F_SSL3_CHANGE_CIPHER_STATE,
184 SSL_R_COMPRESSION_LIBRARY_ERROR);
189 RECORD_LAYER_reset_write_sequence(&s->rlayer);
190 mac_secret = &(s->s3->write_mac_secret[0]);
194 EVP_CIPHER_CTX_reset(dd);
196 p = s->s3->tmp.key_block;
197 mdi = EVP_MD_size(m);
199 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
200 ERR_R_INTERNAL_ERROR);
204 cl = EVP_CIPHER_key_length(c);
206 k = EVP_CIPHER_iv_length(c);
207 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
208 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
225 if (n > s->s3->tmp.key_block_length) {
226 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
227 ERR_R_INTERNAL_ERROR);
231 memcpy(mac_secret, ms, i);
233 if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
234 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_CHANGE_CIPHER_STATE,
235 ERR_R_INTERNAL_ERROR);
239 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
245 int ssl3_setup_key_block(SSL *s)
254 if (s->s3->tmp.key_block_length != 0)
257 if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, &comp, 0)) {
258 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_SETUP_KEY_BLOCK,
259 SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
263 s->s3->tmp.new_sym_enc = c;
264 s->s3->tmp.new_hash = hash;
265 #ifdef OPENSSL_NO_COMP
266 s->s3->tmp.new_compression = NULL;
268 s->s3->tmp.new_compression = comp;
271 num = EVP_MD_size(hash);
275 num = EVP_CIPHER_key_length(c) + num + EVP_CIPHER_iv_length(c);
278 ssl3_cleanup_key_block(s);
280 if ((p = OPENSSL_malloc(num)) == NULL) {
281 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_SETUP_KEY_BLOCK,
282 ERR_R_MALLOC_FAILURE);
286 s->s3->tmp.key_block_length = num;
287 s->s3->tmp.key_block = p;
289 /* Calls SSLfatal() as required */
290 ret = ssl3_generate_key_block(s, p, num);
292 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
294 * enable vulnerability countermeasure for CBC ciphers with known-IV
295 * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
297 s->s3->need_empty_fragments = 1;
299 if (s->session->cipher != NULL) {
300 if (s->session->cipher->algorithm_enc == SSL_eNULL)
301 s->s3->need_empty_fragments = 0;
303 #ifndef OPENSSL_NO_RC4
304 if (s->session->cipher->algorithm_enc == SSL_RC4)
305 s->s3->need_empty_fragments = 0;
313 void ssl3_cleanup_key_block(SSL *s)
315 OPENSSL_clear_free(s->s3->tmp.key_block, s->s3->tmp.key_block_length);
316 s->s3->tmp.key_block = NULL;
317 s->s3->tmp.key_block_length = 0;
320 int ssl3_init_finished_mac(SSL *s)
322 BIO *buf = BIO_new(BIO_s_mem());
325 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_INIT_FINISHED_MAC,
326 ERR_R_MALLOC_FAILURE);
329 ssl3_free_digest_list(s);
330 s->s3->handshake_buffer = buf;
331 (void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE);
336 * Free digest list. Also frees handshake buffer since they are always freed
340 void ssl3_free_digest_list(SSL *s)
342 BIO_free(s->s3->handshake_buffer);
343 s->s3->handshake_buffer = NULL;
344 EVP_MD_CTX_free(s->s3->handshake_dgst);
345 s->s3->handshake_dgst = NULL;
348 int ssl3_finish_mac(SSL *s, const unsigned char *buf, size_t len)
352 if (s->s3->handshake_dgst == NULL) {
353 /* Note: this writes to a memory BIO so a failure is a fatal error */
355 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINISH_MAC,
356 SSL_R_OVERFLOW_ERROR);
359 ret = BIO_write(s->s3->handshake_buffer, (void *)buf, (int)len);
360 if (ret <= 0 || ret != (int)len) {
361 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINISH_MAC,
362 ERR_R_INTERNAL_ERROR);
366 ret = EVP_DigestUpdate(s->s3->handshake_dgst, buf, len);
368 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINISH_MAC,
369 ERR_R_INTERNAL_ERROR);
376 int ssl3_digest_cached_records(SSL *s, int keep)
382 if (s->s3->handshake_dgst == NULL) {
383 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
385 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_DIGEST_CACHED_RECORDS,
386 SSL_R_BAD_HANDSHAKE_LENGTH);
390 s->s3->handshake_dgst = EVP_MD_CTX_new();
391 if (s->s3->handshake_dgst == NULL) {
392 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_DIGEST_CACHED_RECORDS,
393 ERR_R_MALLOC_FAILURE);
397 md = ssl_handshake_md(s);
398 if (md == NULL || !EVP_DigestInit_ex(s->s3->handshake_dgst, md, NULL)
399 || !EVP_DigestUpdate(s->s3->handshake_dgst, hdata, hdatalen)) {
400 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_DIGEST_CACHED_RECORDS,
401 ERR_R_INTERNAL_ERROR);
406 BIO_free(s->s3->handshake_buffer);
407 s->s3->handshake_buffer = NULL;
413 size_t ssl3_final_finish_mac(SSL *s, const char *sender, size_t len,
417 EVP_MD_CTX *ctx = NULL;
419 if (!ssl3_digest_cached_records(s, 0)) {
420 /* SSLfatal() already called */
424 if (EVP_MD_CTX_type(s->s3->handshake_dgst) != NID_md5_sha1) {
425 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
426 SSL_R_NO_REQUIRED_DIGEST);
430 ctx = EVP_MD_CTX_new();
432 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
433 ERR_R_MALLOC_FAILURE);
436 if (!EVP_MD_CTX_copy_ex(ctx, s->s3->handshake_dgst)) {
437 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
438 ERR_R_INTERNAL_ERROR);
443 ret = EVP_MD_CTX_size(ctx);
445 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
446 ERR_R_INTERNAL_ERROR);
451 if ((sender != NULL && EVP_DigestUpdate(ctx, sender, len) <= 0)
452 || EVP_MD_CTX_ctrl(ctx, EVP_CTRL_SSL3_MASTER_SECRET,
453 (int)s->session->master_key_length,
454 s->session->master_key) <= 0
455 || EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
456 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_FINAL_FINISH_MAC,
457 ERR_R_INTERNAL_ERROR);
462 EVP_MD_CTX_free(ctx);
467 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
468 size_t len, size_t *secret_size)
470 static const unsigned char *salt[3] = {
471 #ifndef CHARSET_EBCDIC
472 (const unsigned char *)"A",
473 (const unsigned char *)"BB",
474 (const unsigned char *)"CCC",
476 (const unsigned char *)"\x41",
477 (const unsigned char *)"\x42\x42",
478 (const unsigned char *)"\x43\x43\x43",
481 unsigned char buf[EVP_MAX_MD_SIZE];
482 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
485 size_t ret_secret_size = 0;
488 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_SSL3_GENERATE_MASTER_SECRET,
489 ERR_R_MALLOC_FAILURE);
492 for (i = 0; i < 3; i++) {
493 if (EVP_DigestInit_ex(ctx, s->ctx->sha1, NULL) <= 0
494 || EVP_DigestUpdate(ctx, salt[i],
495 strlen((const char *)salt[i])) <= 0
496 || EVP_DigestUpdate(ctx, p, len) <= 0
497 || EVP_DigestUpdate(ctx, &(s->s3->client_random[0]),
498 SSL3_RANDOM_SIZE) <= 0
499 || EVP_DigestUpdate(ctx, &(s->s3->server_random[0]),
500 SSL3_RANDOM_SIZE) <= 0
501 /* TODO(size_t) : convert me */
502 || EVP_DigestFinal_ex(ctx, buf, &n) <= 0
503 || EVP_DigestInit_ex(ctx, s->ctx->md5, NULL) <= 0
504 || EVP_DigestUpdate(ctx, p, len) <= 0
505 || EVP_DigestUpdate(ctx, buf, n) <= 0
506 || EVP_DigestFinal_ex(ctx, out, &n) <= 0) {
507 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
508 SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_INTERNAL_ERROR);
513 ret_secret_size += n;
515 EVP_MD_CTX_free(ctx);
517 OPENSSL_cleanse(buf, sizeof(buf));
519 *secret_size = ret_secret_size;
523 int ssl3_alert_code(int code)
526 case SSL_AD_CLOSE_NOTIFY:
527 return SSL3_AD_CLOSE_NOTIFY;
528 case SSL_AD_UNEXPECTED_MESSAGE:
529 return SSL3_AD_UNEXPECTED_MESSAGE;
530 case SSL_AD_BAD_RECORD_MAC:
531 return SSL3_AD_BAD_RECORD_MAC;
532 case SSL_AD_DECRYPTION_FAILED:
533 return SSL3_AD_BAD_RECORD_MAC;
534 case SSL_AD_RECORD_OVERFLOW:
535 return SSL3_AD_BAD_RECORD_MAC;
536 case SSL_AD_DECOMPRESSION_FAILURE:
537 return SSL3_AD_DECOMPRESSION_FAILURE;
538 case SSL_AD_HANDSHAKE_FAILURE:
539 return SSL3_AD_HANDSHAKE_FAILURE;
540 case SSL_AD_NO_CERTIFICATE:
541 return SSL3_AD_NO_CERTIFICATE;
542 case SSL_AD_BAD_CERTIFICATE:
543 return SSL3_AD_BAD_CERTIFICATE;
544 case SSL_AD_UNSUPPORTED_CERTIFICATE:
545 return SSL3_AD_UNSUPPORTED_CERTIFICATE;
546 case SSL_AD_CERTIFICATE_REVOKED:
547 return SSL3_AD_CERTIFICATE_REVOKED;
548 case SSL_AD_CERTIFICATE_EXPIRED:
549 return SSL3_AD_CERTIFICATE_EXPIRED;
550 case SSL_AD_CERTIFICATE_UNKNOWN:
551 return SSL3_AD_CERTIFICATE_UNKNOWN;
552 case SSL_AD_ILLEGAL_PARAMETER:
553 return SSL3_AD_ILLEGAL_PARAMETER;
554 case SSL_AD_UNKNOWN_CA:
555 return SSL3_AD_BAD_CERTIFICATE;
556 case SSL_AD_ACCESS_DENIED:
557 return SSL3_AD_HANDSHAKE_FAILURE;
558 case SSL_AD_DECODE_ERROR:
559 return SSL3_AD_HANDSHAKE_FAILURE;
560 case SSL_AD_DECRYPT_ERROR:
561 return SSL3_AD_HANDSHAKE_FAILURE;
562 case SSL_AD_EXPORT_RESTRICTION:
563 return SSL3_AD_HANDSHAKE_FAILURE;
564 case SSL_AD_PROTOCOL_VERSION:
565 return SSL3_AD_HANDSHAKE_FAILURE;
566 case SSL_AD_INSUFFICIENT_SECURITY:
567 return SSL3_AD_HANDSHAKE_FAILURE;
568 case SSL_AD_INTERNAL_ERROR:
569 return SSL3_AD_HANDSHAKE_FAILURE;
570 case SSL_AD_USER_CANCELLED:
571 return SSL3_AD_HANDSHAKE_FAILURE;
572 case SSL_AD_NO_RENEGOTIATION:
573 return -1; /* Don't send it :-) */
574 case SSL_AD_UNSUPPORTED_EXTENSION:
575 return SSL3_AD_HANDSHAKE_FAILURE;
576 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
577 return SSL3_AD_HANDSHAKE_FAILURE;
578 case SSL_AD_UNRECOGNIZED_NAME:
579 return SSL3_AD_HANDSHAKE_FAILURE;
580 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
581 return SSL3_AD_HANDSHAKE_FAILURE;
582 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
583 return SSL3_AD_HANDSHAKE_FAILURE;
584 case SSL_AD_UNKNOWN_PSK_IDENTITY:
585 return TLS1_AD_UNKNOWN_PSK_IDENTITY;
586 case SSL_AD_INAPPROPRIATE_FALLBACK:
587 return TLS1_AD_INAPPROPRIATE_FALLBACK;
588 case SSL_AD_NO_APPLICATION_PROTOCOL:
589 return TLS1_AD_NO_APPLICATION_PROTOCOL;
590 case SSL_AD_CERTIFICATE_REQUIRED:
591 return SSL_AD_HANDSHAKE_FAILURE;