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1/* $OpenBSD: t1_enc.c,v 1.157 2022/11/26 16:08:56 tb Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58/* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111/* ====================================================================
112 * Copyright 2005 Nokia. All rights reserved.
113 *
114 * The portions of the attached software ("Contribution") is developed by
115 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
116 * license.
117 *
118 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
119 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
120 * support (see RFC 4279) to OpenSSL.
121 *
122 * No patent licenses or other rights except those expressly stated in
123 * the OpenSSL open source license shall be deemed granted or received
124 * expressly, by implication, estoppel, or otherwise.
125 *
126 * No assurances are provided by Nokia that the Contribution does not
127 * infringe the patent or other intellectual property rights of any third
128 * party or that the license provides you with all the necessary rights
129 * to make use of the Contribution.
130 *
131 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
132 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
133 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
134 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
135 * OTHERWISE.
136 */
137
138#include <limits.h>
139#include <stdio.h>
140
141#include <openssl/evp.h>
142#include <openssl/hmac.h>
143#include <openssl/md5.h>
144#include <openssl/opensslconf.h>
145
146#include "dtls_local.h"
147#include "ssl_local.h"
148
149void
150tls1_cleanup_key_block(SSL *s)
151{
152 tls12_key_block_free(s->s3->hs.tls12.key_block);
153 s->s3->hs.tls12.key_block = NULL;
154}
155
156/*
157 * TLS P_hash() data expansion function - see RFC 5246, section 5.
158 */
159static int
160tls1_P_hash(const EVP_MD *md, const unsigned char *secret, size_t secret_len,
161 const void *seed1, size_t seed1_len, const void *seed2, size_t seed2_len,
162 const void *seed3, size_t seed3_len, const void *seed4, size_t seed4_len,
163 const void *seed5, size_t seed5_len, unsigned char *out, size_t out_len)
164{
165 unsigned char A1[EVP_MAX_MD_SIZE], hmac[EVP_MAX_MD_SIZE];
166 size_t A1_len, hmac_len;
167 EVP_MD_CTX *ctx = NULL;
168 EVP_PKEY *mac_key = NULL;
169 int ret = 0;
170 int chunk;
171 size_t i;
172
173 chunk = EVP_MD_size(md);
174 OPENSSL_assert(chunk >= 0);
175
176 if ((ctx = EVP_MD_CTX_new()) == NULL)
177 goto err;
178
179 mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, secret, secret_len);
180 if (mac_key == NULL)
181 goto err;
182 if (!EVP_DigestSignInit(ctx, NULL, md, NULL, mac_key))
183 goto err;
184 if (seed1 && !EVP_DigestSignUpdate(ctx, seed1, seed1_len))
185 goto err;
186 if (seed2 && !EVP_DigestSignUpdate(ctx, seed2, seed2_len))
187 goto err;
188 if (seed3 && !EVP_DigestSignUpdate(ctx, seed3, seed3_len))
189 goto err;
190 if (seed4 && !EVP_DigestSignUpdate(ctx, seed4, seed4_len))
191 goto err;
192 if (seed5 && !EVP_DigestSignUpdate(ctx, seed5, seed5_len))
193 goto err;
194 if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
195 goto err;
196
197 for (;;) {
198 if (!EVP_DigestSignInit(ctx, NULL, md, NULL, mac_key))
199 goto err;
200 if (!EVP_DigestSignUpdate(ctx, A1, A1_len))
201 goto err;
202 if (seed1 && !EVP_DigestSignUpdate(ctx, seed1, seed1_len))
203 goto err;
204 if (seed2 && !EVP_DigestSignUpdate(ctx, seed2, seed2_len))
205 goto err;
206 if (seed3 && !EVP_DigestSignUpdate(ctx, seed3, seed3_len))
207 goto err;
208 if (seed4 && !EVP_DigestSignUpdate(ctx, seed4, seed4_len))
209 goto err;
210 if (seed5 && !EVP_DigestSignUpdate(ctx, seed5, seed5_len))
211 goto err;
212 if (!EVP_DigestSignFinal(ctx, hmac, &hmac_len))
213 goto err;
214
215 if (hmac_len > out_len)
216 hmac_len = out_len;
217
218 for (i = 0; i < hmac_len; i++)
219 out[i] ^= hmac[i];
220
221 out += hmac_len;
222 out_len -= hmac_len;
223
224 if (out_len == 0)
225 break;
226
227 if (!EVP_DigestSignInit(ctx, NULL, md, NULL, mac_key))
228 goto err;
229 if (!EVP_DigestSignUpdate(ctx, A1, A1_len))
230 goto err;
231 if (!EVP_DigestSignFinal(ctx, A1, &A1_len))
232 goto err;
233 }
234 ret = 1;
235
236 err:
237 EVP_PKEY_free(mac_key);
238 EVP_MD_CTX_free(ctx);
239
240 explicit_bzero(A1, sizeof(A1));
241 explicit_bzero(hmac, sizeof(hmac));
242
243 return ret;
244}
245
246int
247tls1_PRF(SSL *s, const unsigned char *secret, size_t secret_len,
248 const void *seed1, size_t seed1_len, const void *seed2, size_t seed2_len,
249 const void *seed3, size_t seed3_len, const void *seed4, size_t seed4_len,
250 const void *seed5, size_t seed5_len, unsigned char *out, size_t out_len)
251{
252 const EVP_MD *md;
253 size_t half_len;
254
255 memset(out, 0, out_len);
256
257 if (!ssl_get_handshake_evp_md(s, &md))
258 return (0);
259
260 if (EVP_MD_type(md) == NID_md5_sha1) {
261 /*
262 * Partition secret between MD5 and SHA1, then XOR result.
263 * If the secret length is odd, a one byte overlap is used.
264 */
265 half_len = secret_len - (secret_len / 2);
266 if (!tls1_P_hash(EVP_md5(), secret, half_len, seed1, seed1_len,
267 seed2, seed2_len, seed3, seed3_len, seed4, seed4_len,
268 seed5, seed5_len, out, out_len))
269 return (0);
270
271 secret += secret_len - half_len;
272 if (!tls1_P_hash(EVP_sha1(), secret, half_len, seed1, seed1_len,
273 seed2, seed2_len, seed3, seed3_len, seed4, seed4_len,
274 seed5, seed5_len, out, out_len))
275 return (0);
276
277 return (1);
278 }
279
280 if (!tls1_P_hash(md, secret, secret_len, seed1, seed1_len,
281 seed2, seed2_len, seed3, seed3_len, seed4, seed4_len,
282 seed5, seed5_len, out, out_len))
283 return (0);
284
285 return (1);
286}
287
288int
289tls1_generate_key_block(SSL *s, uint8_t *key_block, size_t key_block_len)
290{
291 return tls1_PRF(s,
292 s->session->master_key, s->session->master_key_length,
293 TLS_MD_KEY_EXPANSION_CONST, TLS_MD_KEY_EXPANSION_CONST_SIZE,
294 s->s3->server_random, SSL3_RANDOM_SIZE,
295 s->s3->client_random, SSL3_RANDOM_SIZE,
296 NULL, 0, NULL, 0, key_block, key_block_len);
297}
298
299static int
300tls1_change_cipher_state(SSL *s, int is_write)
301{
302 CBS mac_key, key, iv;
303
304 /* Use client write keys on client write and server read. */
305 if ((!s->server && is_write) || (s->server && !is_write)) {
306 tls12_key_block_client_write(s->s3->hs.tls12.key_block,
307 &mac_key, &key, &iv);
308 } else {
309 tls12_key_block_server_write(s->s3->hs.tls12.key_block,
310 &mac_key, &key, &iv);
311 }
312
313 if (!is_write) {
314 if (!tls12_record_layer_change_read_cipher_state(s->rl,
315 &mac_key, &key, &iv))
316 goto err;
317 if (SSL_is_dtls(s))
318 dtls1_reset_read_seq_numbers(s);
319 } else {
320 if (!tls12_record_layer_change_write_cipher_state(s->rl,
321 &mac_key, &key, &iv))
322 goto err;
323 }
324 return (1);
325
326 err:
327 return (0);
328}
329
330int
331tls1_change_read_cipher_state(SSL *s)
332{
333 return tls1_change_cipher_state(s, 0);
334}
335
336int
337tls1_change_write_cipher_state(SSL *s)
338{
339 return tls1_change_cipher_state(s, 1);
340}
341
342int
343tls1_setup_key_block(SSL *s)
344{
345 struct tls12_key_block *key_block;
346 int mac_type = NID_undef, mac_secret_size = 0;
347 const EVP_CIPHER *cipher = NULL;
348 const EVP_AEAD *aead = NULL;
349 const EVP_MD *handshake_hash = NULL;
350 const EVP_MD *mac_hash = NULL;
351 int ret = 0;
352
353 /*
354 * XXX - callers should be changed so that they only call this
355 * function once.
356 */
357 if (s->s3->hs.tls12.key_block != NULL)
358 return (1);
359
360 if (s->session->cipher &&
361 (s->session->cipher->algorithm_mac & SSL_AEAD)) {
362 if (!ssl_cipher_get_evp_aead(s->session, &aead)) {
363 SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
364 return (0);
365 }
366 } else {
367 /* XXX - mac_type and mac_secret_size are now unused. */
368 if (!ssl_cipher_get_evp(s->session, &cipher, &mac_hash,
369 &mac_type, &mac_secret_size)) {
370 SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
371 return (0);
372 }
373 }
374
375 if (!ssl_get_handshake_evp_md(s, &handshake_hash))
376 return (0);
377
378 tls12_record_layer_set_aead(s->rl, aead);
379 tls12_record_layer_set_cipher_hash(s->rl, cipher,
380 handshake_hash, mac_hash);
381
382 if ((key_block = tls12_key_block_new()) == NULL)
383 goto err;
384 if (!tls12_key_block_generate(key_block, s, aead, cipher, mac_hash))
385 goto err;
386
387 s->s3->hs.tls12.key_block = key_block;
388 key_block = NULL;
389
390 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS) &&
391 s->method->version <= TLS1_VERSION) {
392 /*
393 * Enable vulnerability countermeasure for CBC ciphers with
394 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
395 */
396 s->s3->need_empty_fragments = 1;
397
398 if (s->session->cipher != NULL) {
399 if (s->session->cipher->algorithm_enc == SSL_eNULL)
400 s->s3->need_empty_fragments = 0;
401
402#ifndef OPENSSL_NO_RC4
403 if (s->session->cipher->algorithm_enc == SSL_RC4)
404 s->s3->need_empty_fragments = 0;
405#endif
406 }
407 }
408
409 ret = 1;
410
411 err:
412 tls12_key_block_free(key_block);
413
414 return (ret);
415}
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