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;
103 ciph = s->s3.tmp.new_sym_enc;
104 md = s->s3.tmp.new_hash;
105 /* m == NULL will lead to a crash later */
106 if (!ossl_assert(md != NULL)) {
107 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
110 #ifndef OPENSSL_NO_COMP
111 comp = s->s3.tmp.new_compression;
114 p = s->s3.tmp.key_block;
115 mdi = EVP_MD_get_size(md);
117 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
120 md_len = (size_t)mdi;
121 key_len = EVP_CIPHER_get_key_length(ciph);
122 iv_len = EVP_CIPHER_get_iv_length(ciph);
123 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
124 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
125 mac_secret = &(p[0]);
128 n += key_len + key_len;
130 n += iv_len + iv_len;
133 mac_secret = &(p[n]);
134 n += md_len + key_len;
136 n += key_len + iv_len;
141 if (n > s->s3.tmp.key_block_length) {
142 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
146 if (which & SSL3_CC_READ) {
147 if (!ssl_set_new_record_layer(s, SSL3_VERSION,
148 OSSL_RECORD_DIRECTION_READ,
149 OSSL_RECORD_PROTECTION_LEVEL_APPLICATION,
150 key, key_len, iv, iv_len, mac_secret,
151 md_len, ciph, 0, NID_undef, md, comp)) {
152 /* SSLfatal already called */
156 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
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, ERR_R_MALLOC_FAILURE);
167 /* make sure it's initialised in case we exit later with an error */
168 EVP_CIPHER_CTX_reset(s->enc_write_ctx);
170 dd = s->enc_write_ctx;
171 if (ssl_replace_hash(&s->write_hash, md) == NULL) {
172 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
175 #ifndef OPENSSL_NO_COMP
177 COMP_CTX_free(s->compress);
180 s->compress = COMP_CTX_new(comp->method);
181 if (s->compress == NULL) {
182 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
183 SSL_R_COMPRESSION_LIBRARY_ERROR);
188 RECORD_LAYER_reset_write_sequence(&s->rlayer);
189 memcpy(&(s->s3.write_mac_secret[0]), mac_secret, md_len);
192 EVP_CIPHER_CTX_reset(dd);
194 if (!EVP_CipherInit_ex(dd, ciph, NULL, key, iv, (which & SSL3_CC_WRITE))) {
195 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
199 if (EVP_CIPHER_get0_provider(ciph) != NULL
200 && !tls_provider_set_tls_params(s, dd, ciph, md)) {
201 /* SSLfatal already called */
205 s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
211 int ssl3_setup_key_block(SSL_CONNECTION *s)
220 if (s->s3.tmp.key_block_length != 0)
223 if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
224 NULL, NULL, &comp, 0)) {
225 /* Error is already recorded */
226 SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
230 ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
231 s->s3.tmp.new_sym_enc = c;
232 ssl_evp_md_free(s->s3.tmp.new_hash);
233 s->s3.tmp.new_hash = hash;
234 #ifdef OPENSSL_NO_COMP
235 s->s3.tmp.new_compression = NULL;
237 s->s3.tmp.new_compression = comp;
240 num = EVP_MD_get_size(hash);
244 num = EVP_CIPHER_get_key_length(c) + num + EVP_CIPHER_get_iv_length(c);
247 ssl3_cleanup_key_block(s);
249 if ((p = OPENSSL_malloc(num)) == NULL) {
250 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
254 s->s3.tmp.key_block_length = num;
255 s->s3.tmp.key_block = p;
257 /* Calls SSLfatal() as required */
258 ret = ssl3_generate_key_block(s, p, num);
260 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) {
262 * enable vulnerability countermeasure for CBC ciphers with known-IV
263 * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
265 s->s3.need_empty_fragments = 1;
267 if (s->session->cipher != NULL) {
268 if (s->session->cipher->algorithm_enc == SSL_eNULL)
269 s->s3.need_empty_fragments = 0;
271 if (s->session->cipher->algorithm_enc == SSL_RC4)
272 s->s3.need_empty_fragments = 0;
279 void ssl3_cleanup_key_block(SSL_CONNECTION *s)
281 OPENSSL_clear_free(s->s3.tmp.key_block, s->s3.tmp.key_block_length);
282 s->s3.tmp.key_block = NULL;
283 s->s3.tmp.key_block_length = 0;
286 int ssl3_init_finished_mac(SSL_CONNECTION *s)
288 BIO *buf = BIO_new(BIO_s_mem());
291 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
294 ssl3_free_digest_list(s);
295 s->s3.handshake_buffer = buf;
296 (void)BIO_set_close(s->s3.handshake_buffer, BIO_CLOSE);
301 * Free digest list. Also frees handshake buffer since they are always freed
305 void ssl3_free_digest_list(SSL_CONNECTION *s)
307 BIO_free(s->s3.handshake_buffer);
308 s->s3.handshake_buffer = NULL;
309 EVP_MD_CTX_free(s->s3.handshake_dgst);
310 s->s3.handshake_dgst = NULL;
313 int ssl3_finish_mac(SSL_CONNECTION *s, const unsigned char *buf, size_t len)
317 if (s->s3.handshake_dgst == NULL) {
318 /* Note: this writes to a memory BIO so a failure is a fatal error */
320 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_OVERFLOW_ERROR);
323 ret = BIO_write(s->s3.handshake_buffer, (void *)buf, (int)len);
324 if (ret <= 0 || ret != (int)len) {
325 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
329 ret = EVP_DigestUpdate(s->s3.handshake_dgst, buf, len);
331 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
338 int ssl3_digest_cached_records(SSL_CONNECTION *s, int keep)
344 if (s->s3.handshake_dgst == NULL) {
345 hdatalen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
347 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
351 s->s3.handshake_dgst = EVP_MD_CTX_new();
352 if (s->s3.handshake_dgst == NULL) {
353 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
357 md = ssl_handshake_md(s);
359 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
360 SSL_R_NO_SUITABLE_DIGEST_ALGORITHM);
363 if (!EVP_DigestInit_ex(s->s3.handshake_dgst, md, NULL)
364 || !EVP_DigestUpdate(s->s3.handshake_dgst, hdata, hdatalen)) {
365 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
370 BIO_free(s->s3.handshake_buffer);
371 s->s3.handshake_buffer = NULL;
377 void ssl3_digest_master_key_set_params(const SSL_SESSION *session,
381 params[n++] = OSSL_PARAM_construct_octet_string(OSSL_DIGEST_PARAM_SSL3_MS,
382 (void *)session->master_key,
383 session->master_key_length);
384 params[n++] = OSSL_PARAM_construct_end();
387 size_t ssl3_final_finish_mac(SSL_CONNECTION *s, const char *sender, size_t len,
391 EVP_MD_CTX *ctx = NULL;
393 if (!ssl3_digest_cached_records(s, 0)) {
394 /* SSLfatal() already called */
398 if (EVP_MD_CTX_get_type(s->s3.handshake_dgst) != NID_md5_sha1) {
399 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_NO_REQUIRED_DIGEST);
403 ctx = EVP_MD_CTX_new();
405 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
408 if (!EVP_MD_CTX_copy_ex(ctx, s->s3.handshake_dgst)) {
409 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
414 ret = EVP_MD_CTX_get_size(ctx);
416 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
421 if (sender != NULL) {
422 OSSL_PARAM digest_cmd_params[3];
424 ssl3_digest_master_key_set_params(s->session, digest_cmd_params);
426 if (EVP_DigestUpdate(ctx, sender, len) <= 0
427 || EVP_MD_CTX_set_params(ctx, digest_cmd_params) <= 0
428 || EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
429 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
435 EVP_MD_CTX_free(ctx);
440 int ssl3_generate_master_secret(SSL_CONNECTION *s, unsigned char *out,
442 size_t len, size_t *secret_size)
444 static const unsigned char *salt[3] = {
445 #ifndef CHARSET_EBCDIC
446 (const unsigned char *)"A",
447 (const unsigned char *)"BB",
448 (const unsigned char *)"CCC",
450 (const unsigned char *)"\x41",
451 (const unsigned char *)"\x42\x42",
452 (const unsigned char *)"\x43\x43\x43",
455 unsigned char buf[EVP_MAX_MD_SIZE];
456 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
459 size_t ret_secret_size = 0;
462 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
465 for (i = 0; i < 3; i++) {
466 if (EVP_DigestInit_ex(ctx, SSL_CONNECTION_GET_CTX(s)->sha1, NULL) <= 0
467 || EVP_DigestUpdate(ctx, salt[i],
468 strlen((const char *)salt[i])) <= 0
469 || EVP_DigestUpdate(ctx, p, len) <= 0
470 || EVP_DigestUpdate(ctx, &(s->s3.client_random[0]),
471 SSL3_RANDOM_SIZE) <= 0
472 || EVP_DigestUpdate(ctx, &(s->s3.server_random[0]),
473 SSL3_RANDOM_SIZE) <= 0
474 || EVP_DigestFinal_ex(ctx, buf, &n) <= 0
475 || EVP_DigestInit_ex(ctx, SSL_CONNECTION_GET_CTX(s)->md5, NULL) <= 0
476 || EVP_DigestUpdate(ctx, p, len) <= 0
477 || EVP_DigestUpdate(ctx, buf, n) <= 0
478 || EVP_DigestFinal_ex(ctx, out, &n) <= 0) {
479 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
484 ret_secret_size += n;
486 EVP_MD_CTX_free(ctx);
488 OPENSSL_cleanse(buf, sizeof(buf));
490 *secret_size = ret_secret_size;
494 int ssl3_alert_code(int code)
497 case SSL_AD_CLOSE_NOTIFY:
498 return SSL3_AD_CLOSE_NOTIFY;
499 case SSL_AD_UNEXPECTED_MESSAGE:
500 return SSL3_AD_UNEXPECTED_MESSAGE;
501 case SSL_AD_BAD_RECORD_MAC:
502 return SSL3_AD_BAD_RECORD_MAC;
503 case SSL_AD_DECRYPTION_FAILED:
504 return SSL3_AD_BAD_RECORD_MAC;
505 case SSL_AD_RECORD_OVERFLOW:
506 return SSL3_AD_BAD_RECORD_MAC;
507 case SSL_AD_DECOMPRESSION_FAILURE:
508 return SSL3_AD_DECOMPRESSION_FAILURE;
509 case SSL_AD_HANDSHAKE_FAILURE:
510 return SSL3_AD_HANDSHAKE_FAILURE;
511 case SSL_AD_NO_CERTIFICATE:
512 return SSL3_AD_NO_CERTIFICATE;
513 case SSL_AD_BAD_CERTIFICATE:
514 return SSL3_AD_BAD_CERTIFICATE;
515 case SSL_AD_UNSUPPORTED_CERTIFICATE:
516 return SSL3_AD_UNSUPPORTED_CERTIFICATE;
517 case SSL_AD_CERTIFICATE_REVOKED:
518 return SSL3_AD_CERTIFICATE_REVOKED;
519 case SSL_AD_CERTIFICATE_EXPIRED:
520 return SSL3_AD_CERTIFICATE_EXPIRED;
521 case SSL_AD_CERTIFICATE_UNKNOWN:
522 return SSL3_AD_CERTIFICATE_UNKNOWN;
523 case SSL_AD_ILLEGAL_PARAMETER:
524 return SSL3_AD_ILLEGAL_PARAMETER;
525 case SSL_AD_UNKNOWN_CA:
526 return SSL3_AD_BAD_CERTIFICATE;
527 case SSL_AD_ACCESS_DENIED:
528 return SSL3_AD_HANDSHAKE_FAILURE;
529 case SSL_AD_DECODE_ERROR:
530 return SSL3_AD_HANDSHAKE_FAILURE;
531 case SSL_AD_DECRYPT_ERROR:
532 return SSL3_AD_HANDSHAKE_FAILURE;
533 case SSL_AD_EXPORT_RESTRICTION:
534 return SSL3_AD_HANDSHAKE_FAILURE;
535 case SSL_AD_PROTOCOL_VERSION:
536 return SSL3_AD_HANDSHAKE_FAILURE;
537 case SSL_AD_INSUFFICIENT_SECURITY:
538 return SSL3_AD_HANDSHAKE_FAILURE;
539 case SSL_AD_INTERNAL_ERROR:
540 return SSL3_AD_HANDSHAKE_FAILURE;
541 case SSL_AD_USER_CANCELLED:
542 return SSL3_AD_HANDSHAKE_FAILURE;
543 case SSL_AD_NO_RENEGOTIATION:
544 return -1; /* Don't send it :-) */
545 case SSL_AD_UNSUPPORTED_EXTENSION:
546 return SSL3_AD_HANDSHAKE_FAILURE;
547 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
548 return SSL3_AD_HANDSHAKE_FAILURE;
549 case SSL_AD_UNRECOGNIZED_NAME:
550 return SSL3_AD_HANDSHAKE_FAILURE;
551 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
552 return SSL3_AD_HANDSHAKE_FAILURE;
553 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
554 return SSL3_AD_HANDSHAKE_FAILURE;
555 case SSL_AD_UNKNOWN_PSK_IDENTITY:
556 return TLS1_AD_UNKNOWN_PSK_IDENTITY;
557 case SSL_AD_INAPPROPRIATE_FALLBACK:
558 return TLS1_AD_INAPPROPRIATE_FALLBACK;
559 case SSL_AD_NO_APPLICATION_PROTOCOL:
560 return TLS1_AD_NO_APPLICATION_PROTOCOL;
561 case SSL_AD_CERTIFICATE_REQUIRED:
562 return SSL_AD_HANDSHAKE_FAILURE;
563 case TLS13_AD_MISSING_EXTENSION:
564 return SSL_AD_HANDSHAKE_FAILURE;