2 * Copyright 1995-2023 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_EVP_LIB);
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;
95 const EVP_CIPHER *ciph;
96 const SSL_COMP *comp = NULL;
99 size_t n, iv_len, key_len;
100 int direction = (which & SSL3_CC_READ) != 0 ? OSSL_RECORD_DIRECTION_READ
101 : OSSL_RECORD_DIRECTION_WRITE;
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);
124 if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
125 (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
126 mac_secret = &(p[0]);
129 n += key_len + key_len;
131 n += iv_len + iv_len;
134 mac_secret = &(p[n]);
135 n += md_len + key_len;
137 n += key_len + iv_len;
142 if (n > s->s3.tmp.key_block_length) {
143 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
147 if (!ssl_set_new_record_layer(s, SSL3_VERSION,
149 OSSL_RECORD_PROTECTION_LEVEL_APPLICATION,
150 NULL, 0, key, key_len, iv, iv_len, mac_secret,
151 md_len, ciph, 0, NID_undef, md, comp, NULL)) {
152 /* SSLfatal already called */
161 int ssl3_setup_key_block(SSL_CONNECTION *s)
170 if (s->s3.tmp.key_block_length != 0)
173 if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
174 NULL, NULL, &comp, 0)) {
175 /* Error is already recorded */
176 SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
180 ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
181 s->s3.tmp.new_sym_enc = c;
182 ssl_evp_md_free(s->s3.tmp.new_hash);
183 s->s3.tmp.new_hash = hash;
184 #ifdef OPENSSL_NO_COMP
185 s->s3.tmp.new_compression = NULL;
187 s->s3.tmp.new_compression = comp;
190 num = EVP_MD_get_size(hash);
194 num = EVP_CIPHER_get_key_length(c) + num + EVP_CIPHER_get_iv_length(c);
197 ssl3_cleanup_key_block(s);
199 if ((p = OPENSSL_malloc(num)) == NULL) {
200 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB);
204 s->s3.tmp.key_block_length = num;
205 s->s3.tmp.key_block = p;
207 /* Calls SSLfatal() as required */
208 ret = ssl3_generate_key_block(s, p, num);
213 void ssl3_cleanup_key_block(SSL_CONNECTION *s)
215 OPENSSL_clear_free(s->s3.tmp.key_block, s->s3.tmp.key_block_length);
216 s->s3.tmp.key_block = NULL;
217 s->s3.tmp.key_block_length = 0;
220 int ssl3_init_finished_mac(SSL_CONNECTION *s)
222 BIO *buf = BIO_new(BIO_s_mem());
225 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_BIO_LIB);
228 ssl3_free_digest_list(s);
229 s->s3.handshake_buffer = buf;
230 (void)BIO_set_close(s->s3.handshake_buffer, BIO_CLOSE);
235 * Free digest list. Also frees handshake buffer since they are always freed
239 void ssl3_free_digest_list(SSL_CONNECTION *s)
241 BIO_free(s->s3.handshake_buffer);
242 s->s3.handshake_buffer = NULL;
243 EVP_MD_CTX_free(s->s3.handshake_dgst);
244 s->s3.handshake_dgst = NULL;
247 int ssl3_finish_mac(SSL_CONNECTION *s, const unsigned char *buf, size_t len)
251 if (s->s3.handshake_dgst == NULL) {
252 /* Note: this writes to a memory BIO so a failure is a fatal error */
254 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_OVERFLOW_ERROR);
257 ret = BIO_write(s->s3.handshake_buffer, (void *)buf, (int)len);
258 if (ret <= 0 || ret != (int)len) {
259 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
263 ret = EVP_DigestUpdate(s->s3.handshake_dgst, buf, len);
265 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
272 int ssl3_digest_cached_records(SSL_CONNECTION *s, int keep)
278 if (s->s3.handshake_dgst == NULL) {
279 hdatalen = BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
281 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
285 s->s3.handshake_dgst = EVP_MD_CTX_new();
286 if (s->s3.handshake_dgst == NULL) {
287 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
291 md = ssl_handshake_md(s);
293 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
294 SSL_R_NO_SUITABLE_DIGEST_ALGORITHM);
297 if (!EVP_DigestInit_ex(s->s3.handshake_dgst, md, NULL)
298 || !EVP_DigestUpdate(s->s3.handshake_dgst, hdata, hdatalen)) {
299 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
304 BIO_free(s->s3.handshake_buffer);
305 s->s3.handshake_buffer = NULL;
311 void ssl3_digest_master_key_set_params(const SSL_SESSION *session,
315 params[n++] = OSSL_PARAM_construct_octet_string(OSSL_DIGEST_PARAM_SSL3_MS,
316 (void *)session->master_key,
317 session->master_key_length);
318 params[n++] = OSSL_PARAM_construct_end();
321 size_t ssl3_final_finish_mac(SSL_CONNECTION *s, const char *sender, size_t len,
325 EVP_MD_CTX *ctx = NULL;
327 if (!ssl3_digest_cached_records(s, 0)) {
328 /* SSLfatal() already called */
332 if (EVP_MD_CTX_get_type(s->s3.handshake_dgst) != NID_md5_sha1) {
333 SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_NO_REQUIRED_DIGEST);
337 ctx = EVP_MD_CTX_new();
339 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
342 if (!EVP_MD_CTX_copy_ex(ctx, s->s3.handshake_dgst)) {
343 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
348 ret = EVP_MD_CTX_get_size(ctx);
350 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
355 if (sender != NULL) {
356 OSSL_PARAM digest_cmd_params[3];
358 ssl3_digest_master_key_set_params(s->session, digest_cmd_params);
360 if (EVP_DigestUpdate(ctx, sender, len) <= 0
361 || EVP_MD_CTX_set_params(ctx, digest_cmd_params) <= 0
362 || EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
363 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
369 EVP_MD_CTX_free(ctx);
374 int ssl3_generate_master_secret(SSL_CONNECTION *s, unsigned char *out,
376 size_t len, size_t *secret_size)
378 static const unsigned char *const salt[3] = {
379 #ifndef CHARSET_EBCDIC
380 (const unsigned char *)"A",
381 (const unsigned char *)"BB",
382 (const unsigned char *)"CCC",
384 (const unsigned char *)"\x41",
385 (const unsigned char *)"\x42\x42",
386 (const unsigned char *)"\x43\x43\x43",
389 unsigned char buf[EVP_MAX_MD_SIZE];
390 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
393 size_t ret_secret_size = 0;
396 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
399 for (i = 0; i < 3; i++) {
400 if (EVP_DigestInit_ex(ctx, SSL_CONNECTION_GET_CTX(s)->sha1, NULL) <= 0
401 || EVP_DigestUpdate(ctx, salt[i],
402 strlen((const char *)salt[i])) <= 0
403 || EVP_DigestUpdate(ctx, p, len) <= 0
404 || EVP_DigestUpdate(ctx, &(s->s3.client_random[0]),
405 SSL3_RANDOM_SIZE) <= 0
406 || EVP_DigestUpdate(ctx, &(s->s3.server_random[0]),
407 SSL3_RANDOM_SIZE) <= 0
408 || EVP_DigestFinal_ex(ctx, buf, &n) <= 0
409 || EVP_DigestInit_ex(ctx, SSL_CONNECTION_GET_CTX(s)->md5, NULL) <= 0
410 || EVP_DigestUpdate(ctx, p, len) <= 0
411 || EVP_DigestUpdate(ctx, buf, n) <= 0
412 || EVP_DigestFinal_ex(ctx, out, &n) <= 0) {
413 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
418 ret_secret_size += n;
420 EVP_MD_CTX_free(ctx);
422 OPENSSL_cleanse(buf, sizeof(buf));
424 *secret_size = ret_secret_size;
428 int ssl3_alert_code(int code)
431 case SSL_AD_CLOSE_NOTIFY:
432 return SSL3_AD_CLOSE_NOTIFY;
433 case SSL_AD_UNEXPECTED_MESSAGE:
434 return SSL3_AD_UNEXPECTED_MESSAGE;
435 case SSL_AD_BAD_RECORD_MAC:
436 return SSL3_AD_BAD_RECORD_MAC;
437 case SSL_AD_DECRYPTION_FAILED:
438 return SSL3_AD_BAD_RECORD_MAC;
439 case SSL_AD_RECORD_OVERFLOW:
440 return SSL3_AD_BAD_RECORD_MAC;
441 case SSL_AD_DECOMPRESSION_FAILURE:
442 return SSL3_AD_DECOMPRESSION_FAILURE;
443 case SSL_AD_HANDSHAKE_FAILURE:
444 return SSL3_AD_HANDSHAKE_FAILURE;
445 case SSL_AD_NO_CERTIFICATE:
446 return SSL3_AD_NO_CERTIFICATE;
447 case SSL_AD_BAD_CERTIFICATE:
448 return SSL3_AD_BAD_CERTIFICATE;
449 case SSL_AD_UNSUPPORTED_CERTIFICATE:
450 return SSL3_AD_UNSUPPORTED_CERTIFICATE;
451 case SSL_AD_CERTIFICATE_REVOKED:
452 return SSL3_AD_CERTIFICATE_REVOKED;
453 case SSL_AD_CERTIFICATE_EXPIRED:
454 return SSL3_AD_CERTIFICATE_EXPIRED;
455 case SSL_AD_CERTIFICATE_UNKNOWN:
456 return SSL3_AD_CERTIFICATE_UNKNOWN;
457 case SSL_AD_ILLEGAL_PARAMETER:
458 return SSL3_AD_ILLEGAL_PARAMETER;
459 case SSL_AD_UNKNOWN_CA:
460 return SSL3_AD_BAD_CERTIFICATE;
461 case SSL_AD_ACCESS_DENIED:
462 return SSL3_AD_HANDSHAKE_FAILURE;
463 case SSL_AD_DECODE_ERROR:
464 return SSL3_AD_HANDSHAKE_FAILURE;
465 case SSL_AD_DECRYPT_ERROR:
466 return SSL3_AD_HANDSHAKE_FAILURE;
467 case SSL_AD_EXPORT_RESTRICTION:
468 return SSL3_AD_HANDSHAKE_FAILURE;
469 case SSL_AD_PROTOCOL_VERSION:
470 return SSL3_AD_HANDSHAKE_FAILURE;
471 case SSL_AD_INSUFFICIENT_SECURITY:
472 return SSL3_AD_HANDSHAKE_FAILURE;
473 case SSL_AD_INTERNAL_ERROR:
474 return SSL3_AD_HANDSHAKE_FAILURE;
475 case SSL_AD_USER_CANCELLED:
476 return SSL3_AD_HANDSHAKE_FAILURE;
477 case SSL_AD_NO_RENEGOTIATION:
478 return -1; /* Don't send it :-) */
479 case SSL_AD_UNSUPPORTED_EXTENSION:
480 return SSL3_AD_HANDSHAKE_FAILURE;
481 case SSL_AD_CERTIFICATE_UNOBTAINABLE:
482 return SSL3_AD_HANDSHAKE_FAILURE;
483 case SSL_AD_UNRECOGNIZED_NAME:
484 return SSL3_AD_HANDSHAKE_FAILURE;
485 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
486 return SSL3_AD_HANDSHAKE_FAILURE;
487 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
488 return SSL3_AD_HANDSHAKE_FAILURE;
489 case SSL_AD_UNKNOWN_PSK_IDENTITY:
490 return TLS1_AD_UNKNOWN_PSK_IDENTITY;
491 case SSL_AD_INAPPROPRIATE_FALLBACK:
492 return TLS1_AD_INAPPROPRIATE_FALLBACK;
493 case SSL_AD_NO_APPLICATION_PROTOCOL:
494 return TLS1_AD_NO_APPLICATION_PROTOCOL;
495 case SSL_AD_CERTIFICATE_REQUIRED:
496 return SSL_AD_HANDSHAKE_FAILURE;
497 case TLS13_AD_MISSING_EXTENSION:
498 return SSL_AD_HANDSHAKE_FAILURE;