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;
94 unsigned char *key, *iv;
96 const EVP_CIPHER *ciph;
97 const SSL_COMP *comp = NULL;
100 size_t n, iv_len, key_len;
102 int direction = (which & SSL3_CC_READ) != 0 ? OSSL_RECORD_DIRECTION_READ
103 : OSSL_RECORD_DIRECTION_WRITE;
105 ciph = s->s3.tmp.new_sym_enc;
106 md = s->s3.tmp.new_hash;
107 /* m == NULL will lead to a crash later */
108 if (!ossl_assert(md != NULL)) {
109 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
112 #ifndef OPENSSL_NO_COMP
113 comp = s->s3.tmp.new_compression;
116 p = s->s3.tmp.key_block;
117 mdi = EVP_MD_get_size(md);
119 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
122 md_len = (size_t)mdi;
123 key_len = EVP_CIPHER_get_key_length(ciph);
124 iv_len = EVP_CIPHER_get_iv_length(ciph);
125 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
126 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
127 mac_secret = &(p[0]);
130 n += key_len + key_len;
132 n += iv_len + iv_len;
135 mac_secret = &(p[n]);
136 n += md_len + key_len;
138 n += key_len + iv_len;
143 if (n > s->s3.tmp.key_block_length) {
144 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
148 if (!ssl_set_new_record_layer(s, SSL3_VERSION,
150 OSSL_RECORD_PROTECTION_LEVEL_APPLICATION,
151 key, key_len, iv, iv_len, mac_secret,
152 md_len, ciph, 0, NID_undef, md, comp)) {
153 /* SSLfatal already called */
157 if (which & SSL3_CC_READ) {
158 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
162 s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
163 if (s->enc_write_ctx != NULL) {
165 } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
166 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
169 /* make sure it's initialised in case we exit later with an error */
170 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
172 dd = s->enc_write_ctx;
173 if (ssl_replace_hash(&s->write_hash, md) == NULL) {
174 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
177 #ifndef OPENSSL_NO_COMP
179 COMP_CTX_free(s->compress);
182 s->compress = COMP_CTX_new(comp->method);
183 if (s->compress == NULL) {
184 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
185 SSL_R_COMPRESSION_LIBRARY_ERROR);
190 RECORD_LAYER_reset_write_sequence(&s->rlayer);
191 memcpy(&(s->s3.write_mac_secret[0]), mac_secret, md_len);
194 EVP_CIPHER_CTX_reset(dd);
196 if (!EVP_CipherInit_ex(dd, ciph, NULL, key, iv, (which & SSL3_CC_WRITE))) {
197 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
201 if (EVP_CIPHER_get0_provider(ciph) != NULL
202 && !tls_provider_set_tls_params(s, dd, ciph, md)) {
203 /* SSLfatal already called */
207 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
213 int ssl3_setup_key_block(SSL_CONNECTION *s)
222 if (s->s3.tmp.key_block_length != 0)
225 if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
226 NULL, NULL, &comp, 0)) {
227 /* Error is already recorded */
228 SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
232 ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
233 s->s3.tmp.new_sym_enc = c;
234 ssl_evp_md_free(s->s3.tmp.new_hash);
235 s->s3.tmp.new_hash = hash;
236 #ifdef OPENSSL_NO_COMP
237 s->s3.tmp.new_compression = NULL;
239 s->s3.tmp.new_compression = comp;
242 num = EVP_MD_get_size(hash);
246 num = EVP_CIPHER_get_key_length(c) + num + EVP_CIPHER_get_iv_length(c);
249 ssl3_cleanup_key_block(s);
251 if ((p = OPENSSL_malloc(num)) == NULL) {
252 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
256 s->s3.tmp.key_block_length = num;
257 s->s3.tmp.key_block = p;
259 /* Calls SSLfatal() as required */
260 ret = ssl3_generate_key_block(s, p, num);
262 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
264 * enable vulnerability countermeasure for CBC ciphers with known-IV
265 * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
267 s->s3.need_empty_fragments = 1;
269 if (s->session->cipher != NULL) {
270 if (s->session->cipher->algorithm_enc == SSL_eNULL)
271 s->s3.need_empty_fragments = 0;
273 if (s->session->cipher->algorithm_enc == SSL_RC4)
274 s->s3.need_empty_fragments = 0;
281 void ssl3_cleanup_key_block(SSL_CONNECTION *s)
283 OPENSSL_clear_free(s->s3.tmp.key_block, s->s3.tmp.key_block_length);
284 s->s3.tmp.key_block = NULL;
285 s->s3.tmp.key_block_length = 0;
288 int ssl3_init_finished_mac(SSL_CONNECTION *s)
290 BIO *buf = BIO_new(BIO_s_mem());
293 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
296 ssl3_free_digest_list(s);
297 s->s3.handshake_buffer = buf;
298 (void)BIO_set_close(s->s3.handshake_buffer, BIO_CLOSE);
303 * Free digest list. Also frees handshake buffer since they are always freed
307 void ssl3_free_digest_list(SSL_CONNECTION *s)
309 BIO_free(s->s3.handshake_buffer);
310 s->s3.handshake_buffer = NULL;
311 EVP_MD_CTX_free(s->s3.handshake_dgst);
312 s->s3.handshake_dgst = NULL;
315 int ssl3_finish_mac(SSL_CONNECTION *s, const unsigned char *buf, size_t len)
319 if (s->s3.handshake_dgst == NULL) {
320 /* Note: this writes to a memory BIO so a failure is a fatal error */
322 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_OVERFLOW_ERROR);
325 ret = BIO_write(s->s3.handshake_buffer, (void *)buf, (int)len);
326 if (ret <= 0 || ret != (int)len) {
327 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
331 ret = EVP_DigestUpdate(s->s3.handshake_dgst, buf, len);
333 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
340 int ssl3_digest_cached_records(SSL_CONNECTION *s, int keep)
346 if (s->s3.handshake_dgst == NULL) {
347 hdatalen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
349 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
353 s->s3.handshake_dgst = EVP_MD_CTX_new();
354 if (s->s3.handshake_dgst == NULL) {
355 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
359 md = ssl_handshake_md(s);
361 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
362 SSL_R_NO_SUITABLE_DIGEST_ALGORITHM);
365 if (!EVP_DigestInit_ex(s->s3.handshake_dgst, md, NULL)
366 || !EVP_DigestUpdate(s->s3.handshake_dgst, hdata, hdatalen)) {
367 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
372 BIO_free(s->s3.handshake_buffer);
373 s->s3.handshake_buffer = NULL;
379 void ssl3_digest_master_key_set_params(const SSL_SESSION *session,
383 params[n++] = OSSL_PARAM_construct_octet_string(OSSL_DIGEST_PARAM_SSL3_MS,
384 (void *)session->master_key,
385 session->master_key_length);
386 params[n++] = OSSL_PARAM_construct_end();
389 size_t ssl3_final_finish_mac(SSL_CONNECTION *s, const char *sender, size_t len,
393 EVP_MD_CTX *ctx = NULL;
395 if (!ssl3_digest_cached_records(s, 0)) {
396 /* SSLfatal() already called */
400 if (EVP_MD_CTX_get_type(s->s3.handshake_dgst) != NID_md5_sha1) {
401 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_NO_REQUIRED_DIGEST);
405 ctx = EVP_MD_CTX_new();
407 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
410 if (!EVP_MD_CTX_copy_ex(ctx, s->s3.handshake_dgst)) {
411 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
416 ret = EVP_MD_CTX_get_size(ctx);
418 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
423 if (sender != NULL) {
424 OSSL_PARAM digest_cmd_params[3];
426 ssl3_digest_master_key_set_params(s->session, digest_cmd_params);
428 if (EVP_DigestUpdate(ctx, sender, len) <= 0
429 || EVP_MD_CTX_set_params(ctx, digest_cmd_params) <= 0
430 || EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
431 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
437 EVP_MD_CTX_free(ctx);
442 int ssl3_generate_master_secret(SSL_CONNECTION *s, unsigned char *out,
444 size_t len, size_t *secret_size)
446 static const unsigned char *salt[3] = {
447 #ifndef CHARSET_EBCDIC
448 (const unsigned char *)"A",
449 (const unsigned char *)"BB",
450 (const unsigned char *)"CCC",
452 (const unsigned char *)"\x41",
453 (const unsigned char *)"\x42\x42",
454 (const unsigned char *)"\x43\x43\x43",
457 unsigned char buf[EVP_MAX_MD_SIZE];
458 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
461 size_t ret_secret_size = 0;
464 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
467 for (i = 0; i < 3; i++) {
468 if (EVP_DigestInit_ex(ctx, SSL_CONNECTION_GET_CTX(s)->sha1, NULL) <= 0
469 || EVP_DigestUpdate(ctx, salt[i],
470 strlen((const char *)salt[i])) <= 0
471 || EVP_DigestUpdate(ctx, p, len) <= 0
472 || EVP_DigestUpdate(ctx, &(s->s3.client_random[0]),
473 SSL3_RANDOM_SIZE) <= 0
474 || EVP_DigestUpdate(ctx, &(s->s3.server_random[0]),
475 SSL3_RANDOM_SIZE) <= 0
476 || EVP_DigestFinal_ex(ctx, buf, &n) <= 0
477 || EVP_DigestInit_ex(ctx, SSL_CONNECTION_GET_CTX(s)->md5, NULL) <= 0
478 || EVP_DigestUpdate(ctx, p, len) <= 0
479 || EVP_DigestUpdate(ctx, buf, n) <= 0
480 || EVP_DigestFinal_ex(ctx, out, &n) <= 0) {
481 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
486 ret_secret_size += n;
488 EVP_MD_CTX_free(ctx);
490 OPENSSL_cleanse(buf, sizeof(buf));
492 *secret_size = ret_secret_size;
496 int ssl3_alert_code(int code)
499 case SSL_AD_CLOSE_NOTIFY:
500 return SSL3_AD_CLOSE_NOTIFY;
501 case SSL_AD_UNEXPECTED_MESSAGE:
502 return SSL3_AD_UNEXPECTED_MESSAGE;
503 case SSL_AD_BAD_RECORD_MAC:
504 return SSL3_AD_BAD_RECORD_MAC;
505 case SSL_AD_DECRYPTION_FAILED:
506 return SSL3_AD_BAD_RECORD_MAC;
507 case SSL_AD_RECORD_OVERFLOW:
508 return SSL3_AD_BAD_RECORD_MAC;
509 case SSL_AD_DECOMPRESSION_FAILURE:
510 return SSL3_AD_DECOMPRESSION_FAILURE;
511 case SSL_AD_HANDSHAKE_FAILURE:
512 return SSL3_AD_HANDSHAKE_FAILURE;
513 case SSL_AD_NO_CERTIFICATE:
514 return SSL3_AD_NO_CERTIFICATE;
515 case SSL_AD_BAD_CERTIFICATE:
516 return SSL3_AD_BAD_CERTIFICATE;
517 case SSL_AD_UNSUPPORTED_CERTIFICATE:
518 return SSL3_AD_UNSUPPORTED_CERTIFICATE;
519 case SSL_AD_CERTIFICATE_REVOKED:
520 return SSL3_AD_CERTIFICATE_REVOKED;
521 case SSL_AD_CERTIFICATE_EXPIRED:
522 return SSL3_AD_CERTIFICATE_EXPIRED;
523 case SSL_AD_CERTIFICATE_UNKNOWN:
524 return SSL3_AD_CERTIFICATE_UNKNOWN;
525 case SSL_AD_ILLEGAL_PARAMETER:
526 return SSL3_AD_ILLEGAL_PARAMETER;
527 case SSL_AD_UNKNOWN_CA:
528 return SSL3_AD_BAD_CERTIFICATE;
529 case SSL_AD_ACCESS_DENIED:
530 return SSL3_AD_HANDSHAKE_FAILURE;
531 case SSL_AD_DECODE_ERROR:
532 return SSL3_AD_HANDSHAKE_FAILURE;
533 case SSL_AD_DECRYPT_ERROR:
534 return SSL3_AD_HANDSHAKE_FAILURE;
535 case SSL_AD_EXPORT_RESTRICTION:
536 return SSL3_AD_HANDSHAKE_FAILURE;
537 case SSL_AD_PROTOCOL_VERSION:
538 return SSL3_AD_HANDSHAKE_FAILURE;
539 case SSL_AD_INSUFFICIENT_SECURITY:
540 return SSL3_AD_HANDSHAKE_FAILURE;
541 case SSL_AD_INTERNAL_ERROR:
542 return SSL3_AD_HANDSHAKE_FAILURE;
543 case SSL_AD_USER_CANCELLED:
544 return SSL3_AD_HANDSHAKE_FAILURE;
545 case SSL_AD_NO_RENEGOTIATION:
546 return -1; /* Don't send it :-) */
547 case SSL_AD_UNSUPPORTED_EXTENSION:
548 return SSL3_AD_HANDSHAKE_FAILURE;
549 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
550 return SSL3_AD_HANDSHAKE_FAILURE;
551 case SSL_AD_UNRECOGNIZED_NAME:
552 return SSL3_AD_HANDSHAKE_FAILURE;
553 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
554 return SSL3_AD_HANDSHAKE_FAILURE;
555 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
556 return SSL3_AD_HANDSHAKE_FAILURE;
557 case SSL_AD_UNKNOWN_PSK_IDENTITY:
558 return TLS1_AD_UNKNOWN_PSK_IDENTITY;
559 case SSL_AD_INAPPROPRIATE_FALLBACK:
560 return TLS1_AD_INAPPROPRIATE_FALLBACK;
561 case SSL_AD_NO_APPLICATION_PROTOCOL:
562 return TLS1_AD_NO_APPLICATION_PROTOCOL;
563 case SSL_AD_CERTIFICATE_REQUIRED:
564 return SSL_AD_HANDSHAKE_FAILURE;
565 case TLS13_AD_MISSING_EXTENSION:
566 return SSL_AD_HANDSHAKE_FAILURE;