2 * Copyright 1995-2016 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 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
36 EVP_MD_CTX_set_flags(m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
37 for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) {
39 if (k > sizeof(buf)) {
40 /* bug: 'buf' is too small for this ciphersuite */
41 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
45 for (j = 0; j < k; j++)
48 if (!EVP_DigestInit_ex(s1, EVP_sha1(), NULL)
49 || !EVP_DigestUpdate(s1, buf, k)
50 || !EVP_DigestUpdate(s1, s->session->master_key,
51 s->session->master_key_length)
52 || !EVP_DigestUpdate(s1, s->s3->server_random, SSL3_RANDOM_SIZE)
53 || !EVP_DigestUpdate(s1, s->s3->client_random, SSL3_RANDOM_SIZE)
54 || !EVP_DigestFinal_ex(s1, smd, NULL)
55 || !EVP_DigestInit_ex(m5, EVP_md5(), NULL)
56 || !EVP_DigestUpdate(m5, s->session->master_key,
57 s->session->master_key_length)
58 || !EVP_DigestUpdate(m5, smd, SHA_DIGEST_LENGTH))
60 if ((int)(i + MD5_DIGEST_LENGTH) > num) {
61 if (!EVP_DigestFinal_ex(m5, smd, NULL))
63 memcpy(km, smd, (num - i));
65 if (!EVP_DigestFinal_ex(m5, km, NULL))
69 km += MD5_DIGEST_LENGTH;
71 OPENSSL_cleanse(smd, sizeof(smd));
79 int ssl3_change_cipher_state(SSL *s, int which)
81 unsigned char *p, *mac_secret;
82 unsigned char exp_key[EVP_MAX_KEY_LENGTH];
83 unsigned char exp_iv[EVP_MAX_IV_LENGTH];
84 unsigned char *ms, *key, *iv;
87 #ifndef OPENSSL_NO_COMP
92 size_t n, i, j, k, cl;
95 c = s->s3->tmp.new_sym_enc;
96 m = s->s3->tmp.new_hash;
97 /* m == NULL will lead to a crash later */
98 if (!ossl_assert(m != NULL)) {
99 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
102 #ifndef OPENSSL_NO_COMP
103 if (s->s3->tmp.new_compression == NULL)
106 comp = s->s3->tmp.new_compression->method;
109 if (which & SSL3_CC_READ) {
110 if (s->enc_read_ctx != NULL)
112 else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL)
116 * make sure it's initialised in case we exit later with an error
118 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
119 dd = s->enc_read_ctx;
121 if (ssl_replace_hash(&s->read_hash, m) == NULL) {
122 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
125 #ifndef OPENSSL_NO_COMP
127 COMP_CTX_free(s->expand);
130 s->expand = COMP_CTX_new(comp);
131 if (s->expand == NULL) {
132 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
133 SSL_R_COMPRESSION_LIBRARY_ERROR);
138 RECORD_LAYER_reset_read_sequence(&s->rlayer);
139 mac_secret = &(s->s3->read_mac_secret[0]);
141 if (s->enc_write_ctx != NULL)
143 else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL)
147 * make sure it's initialised in case we exit later with an error
149 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
150 dd = s->enc_write_ctx;
151 if (ssl_replace_hash(&s->write_hash, m) == NULL) {
152 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
155 #ifndef OPENSSL_NO_COMP
157 COMP_CTX_free(s->compress);
160 s->compress = COMP_CTX_new(comp);
161 if (s->compress == NULL) {
162 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
163 SSL_R_COMPRESSION_LIBRARY_ERROR);
168 RECORD_LAYER_reset_write_sequence(&s->rlayer);
169 mac_secret = &(s->s3->write_mac_secret[0]);
173 EVP_CIPHER_CTX_reset(dd);
175 p = s->s3->tmp.key_block;
176 mdi = EVP_MD_size(m);
180 cl = EVP_CIPHER_key_length(c);
182 k = EVP_CIPHER_iv_length(c);
183 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
184 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
201 if (n > s->s3->tmp.key_block_length) {
202 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
206 memcpy(mac_secret, ms, i);
208 if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE)))
211 OPENSSL_cleanse(exp_key, sizeof(exp_key));
212 OPENSSL_cleanse(exp_iv, sizeof(exp_iv));
215 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
217 OPENSSL_cleanse(exp_key, sizeof(exp_key));
218 OPENSSL_cleanse(exp_iv, sizeof(exp_iv));
222 int ssl3_setup_key_block(SSL *s)
231 if (s->s3->tmp.key_block_length != 0)
234 if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, &comp, 0)) {
235 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
239 s->s3->tmp.new_sym_enc = c;
240 s->s3->tmp.new_hash = hash;
241 #ifdef OPENSSL_NO_COMP
242 s->s3->tmp.new_compression = NULL;
244 s->s3->tmp.new_compression = comp;
247 num = EVP_MD_size(hash);
251 num = EVP_CIPHER_key_length(c) + num + EVP_CIPHER_iv_length(c);
254 ssl3_cleanup_key_block(s);
256 if ((p = OPENSSL_malloc(num)) == NULL)
259 s->s3->tmp.key_block_length = num;
260 s->s3->tmp.key_block = p;
262 ret = ssl3_generate_key_block(s, p, num);
264 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
266 * enable vulnerability countermeasure for CBC ciphers with known-IV
267 * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
269 s->s3->need_empty_fragments = 1;
271 if (s->session->cipher != NULL) {
272 if (s->session->cipher->algorithm_enc == SSL_eNULL)
273 s->s3->need_empty_fragments = 0;
275 #ifndef OPENSSL_NO_RC4
276 if (s->session->cipher->algorithm_enc == SSL_RC4)
277 s->s3->need_empty_fragments = 0;
285 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
289 void ssl3_cleanup_key_block(SSL *s)
291 OPENSSL_clear_free(s->s3->tmp.key_block, s->s3->tmp.key_block_length);
292 s->s3->tmp.key_block = NULL;
293 s->s3->tmp.key_block_length = 0;
296 int ssl3_init_finished_mac(SSL *s)
298 BIO *buf = BIO_new(BIO_s_mem());
301 SSLerr(SSL_F_SSL3_INIT_FINISHED_MAC, ERR_R_MALLOC_FAILURE);
304 ssl3_free_digest_list(s);
305 s->s3->handshake_buffer = buf;
306 (void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE);
311 * Free digest list. Also frees handshake buffer since they are always freed
315 void ssl3_free_digest_list(SSL *s)
317 BIO_free(s->s3->handshake_buffer);
318 s->s3->handshake_buffer = NULL;
319 EVP_MD_CTX_free(s->s3->handshake_dgst);
320 s->s3->handshake_dgst = NULL;
323 int ssl3_finish_mac(SSL *s, const unsigned char *buf, size_t len)
325 if (s->s3->handshake_dgst == NULL) {
327 /* Note: this writes to a memory BIO so a failure is a fatal error */
330 ret = BIO_write(s->s3->handshake_buffer, (void *)buf, (int)len);
331 return ret > 0 && ret == (int)len;
333 return EVP_DigestUpdate(s->s3->handshake_dgst, buf, len);
337 int ssl3_digest_cached_records(SSL *s, int keep)
343 if (s->s3->handshake_dgst == NULL) {
344 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
346 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS,
347 SSL_R_BAD_HANDSHAKE_LENGTH);
351 s->s3->handshake_dgst = EVP_MD_CTX_new();
352 if (s->s3->handshake_dgst == NULL) {
353 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE);
357 md = ssl_handshake_md(s);
358 if (md == NULL || !EVP_DigestInit_ex(s->s3->handshake_dgst, md, NULL)
359 || !EVP_DigestUpdate(s->s3->handshake_dgst, hdata, hdatalen)) {
360 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_INTERNAL_ERROR);
365 BIO_free(s->s3->handshake_buffer);
366 s->s3->handshake_buffer = NULL;
372 size_t ssl3_final_finish_mac(SSL *s, const char *sender, size_t len,
376 EVP_MD_CTX *ctx = NULL;
378 if (!ssl3_digest_cached_records(s, 0))
381 if (EVP_MD_CTX_type(s->s3->handshake_dgst) != NID_md5_sha1) {
382 SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, SSL_R_NO_REQUIRED_DIGEST);
386 ctx = EVP_MD_CTX_new();
388 SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_MALLOC_FAILURE);
391 if (!EVP_MD_CTX_copy_ex(ctx, s->s3->handshake_dgst)) {
392 SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_INTERNAL_ERROR);
396 ret = EVP_MD_CTX_size(ctx);
398 EVP_MD_CTX_reset(ctx);
402 if ((sender != NULL && EVP_DigestUpdate(ctx, sender, len) <= 0)
403 || EVP_MD_CTX_ctrl(ctx, EVP_CTRL_SSL3_MASTER_SECRET,
404 (int)s->session->master_key_length,
405 s->session->master_key) <= 0
406 || EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
407 SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_INTERNAL_ERROR);
411 EVP_MD_CTX_free(ctx);
416 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
417 size_t len, size_t *secret_size)
419 static const unsigned char *salt[3] = {
420 #ifndef CHARSET_EBCDIC
421 (const unsigned char *)"A",
422 (const unsigned char *)"BB",
423 (const unsigned char *)"CCC",
425 (const unsigned char *)"\x41",
426 (const unsigned char *)"\x42\x42",
427 (const unsigned char *)"\x43\x43\x43",
430 unsigned char buf[EVP_MAX_MD_SIZE];
431 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
434 size_t ret_secret_size = 0;
437 SSLerr(SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_MALLOC_FAILURE);
440 for (i = 0; i < 3; i++) {
441 if (EVP_DigestInit_ex(ctx, s->ctx->sha1, NULL) <= 0
442 || EVP_DigestUpdate(ctx, salt[i],
443 strlen((const char *)salt[i])) <= 0
444 || EVP_DigestUpdate(ctx, p, len) <= 0
445 || EVP_DigestUpdate(ctx, &(s->s3->client_random[0]),
446 SSL3_RANDOM_SIZE) <= 0
447 || EVP_DigestUpdate(ctx, &(s->s3->server_random[0]),
448 SSL3_RANDOM_SIZE) <= 0
449 /* TODO(size_t) : convert me */
450 || EVP_DigestFinal_ex(ctx, buf, &n) <= 0
451 || EVP_DigestInit_ex(ctx, s->ctx->md5, NULL) <= 0
452 || EVP_DigestUpdate(ctx, p, len) <= 0
453 || EVP_DigestUpdate(ctx, buf, n) <= 0
454 || EVP_DigestFinal_ex(ctx, out, &n) <= 0) {
455 SSLerr(SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_INTERNAL_ERROR);
460 ret_secret_size += n;
462 EVP_MD_CTX_free(ctx);
464 OPENSSL_cleanse(buf, sizeof(buf));
466 *secret_size = ret_secret_size;
470 int ssl3_alert_code(int code)
473 case SSL_AD_CLOSE_NOTIFY:
474 return (SSL3_AD_CLOSE_NOTIFY);
475 case SSL_AD_UNEXPECTED_MESSAGE:
476 return (SSL3_AD_UNEXPECTED_MESSAGE);
477 case SSL_AD_BAD_RECORD_MAC:
478 return (SSL3_AD_BAD_RECORD_MAC);
479 case SSL_AD_DECRYPTION_FAILED:
480 return (SSL3_AD_BAD_RECORD_MAC);
481 case SSL_AD_RECORD_OVERFLOW:
482 return (SSL3_AD_BAD_RECORD_MAC);
483 case SSL_AD_DECOMPRESSION_FAILURE:
484 return (SSL3_AD_DECOMPRESSION_FAILURE);
485 case SSL_AD_HANDSHAKE_FAILURE:
486 return (SSL3_AD_HANDSHAKE_FAILURE);
487 case SSL_AD_NO_CERTIFICATE:
488 return (SSL3_AD_NO_CERTIFICATE);
489 case SSL_AD_BAD_CERTIFICATE:
490 return (SSL3_AD_BAD_CERTIFICATE);
491 case SSL_AD_UNSUPPORTED_CERTIFICATE:
492 return (SSL3_AD_UNSUPPORTED_CERTIFICATE);
493 case SSL_AD_CERTIFICATE_REVOKED:
494 return (SSL3_AD_CERTIFICATE_REVOKED);
495 case SSL_AD_CERTIFICATE_EXPIRED:
496 return (SSL3_AD_CERTIFICATE_EXPIRED);
497 case SSL_AD_CERTIFICATE_UNKNOWN:
498 return (SSL3_AD_CERTIFICATE_UNKNOWN);
499 case SSL_AD_ILLEGAL_PARAMETER:
500 return (SSL3_AD_ILLEGAL_PARAMETER);
501 case SSL_AD_UNKNOWN_CA:
502 return (SSL3_AD_BAD_CERTIFICATE);
503 case SSL_AD_ACCESS_DENIED:
504 return (SSL3_AD_HANDSHAKE_FAILURE);
505 case SSL_AD_DECODE_ERROR:
506 return (SSL3_AD_HANDSHAKE_FAILURE);
507 case SSL_AD_DECRYPT_ERROR:
508 return (SSL3_AD_HANDSHAKE_FAILURE);
509 case SSL_AD_EXPORT_RESTRICTION:
510 return (SSL3_AD_HANDSHAKE_FAILURE);
511 case SSL_AD_PROTOCOL_VERSION:
512 return (SSL3_AD_HANDSHAKE_FAILURE);
513 case SSL_AD_INSUFFICIENT_SECURITY:
514 return (SSL3_AD_HANDSHAKE_FAILURE);
515 case SSL_AD_INTERNAL_ERROR:
516 return (SSL3_AD_HANDSHAKE_FAILURE);
517 case SSL_AD_USER_CANCELLED:
518 return (SSL3_AD_HANDSHAKE_FAILURE);
519 case SSL_AD_NO_RENEGOTIATION:
520 return (-1); /* Don't send it :-) */
521 case SSL_AD_UNSUPPORTED_EXTENSION:
522 return (SSL3_AD_HANDSHAKE_FAILURE);
523 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
524 return (SSL3_AD_HANDSHAKE_FAILURE);
525 case SSL_AD_UNRECOGNIZED_NAME:
526 return (SSL3_AD_HANDSHAKE_FAILURE);
527 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
528 return (SSL3_AD_HANDSHAKE_FAILURE);
529 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
530 return (SSL3_AD_HANDSHAKE_FAILURE);
531 case SSL_AD_UNKNOWN_PSK_IDENTITY:
532 return (TLS1_AD_UNKNOWN_PSK_IDENTITY);
533 case SSL_AD_INAPPROPRIATE_FALLBACK:
534 return (TLS1_AD_INAPPROPRIATE_FALLBACK);
535 case SSL_AD_NO_APPLICATION_PROTOCOL:
536 return (TLS1_AD_NO_APPLICATION_PROTOCOL);
537 case SSL_AD_CERTIFICATE_REQUIRED:
538 return SSL_AD_HANDSHAKE_FAILURE;