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1 | /* ssl/s3_enc.c */ | |
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 <stdio.h> | |
139 | #include "ssl_locl.h" | |
140 | #include <openssl/evp.h> | |
141 | #include <openssl/md5.h> | |
142 | ||
143 | static const unsigned char ssl3_pad_1[48] = { | |
144 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
145 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
146 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
147 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
148 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, | |
149 | 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36 | |
150 | }; | |
151 | ||
152 | static const unsigned char ssl3_pad_2[48] = { | |
153 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
154 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
155 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
156 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
157 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, | |
158 | 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c | |
159 | }; | |
160 | ||
161 | static int ssl3_handshake_mac(SSL *s, int md_nid, | |
162 | const char *sender, int len, unsigned char *p); | |
163 | static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) | |
164 | { | |
165 | EVP_MD_CTX m5; | |
166 | EVP_MD_CTX s1; | |
167 | unsigned char buf[16], smd[SHA_DIGEST_LENGTH]; | |
168 | unsigned char c = 'A'; | |
169 | unsigned int i, j, k; | |
170 | ||
171 | #ifdef CHARSET_EBCDIC | |
172 | c = os_toascii[c]; /* 'A' in ASCII */ | |
173 | #endif | |
174 | k = 0; | |
175 | EVP_MD_CTX_init(&m5); | |
176 | EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); | |
177 | EVP_MD_CTX_init(&s1); | |
178 | for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) { | |
179 | k++; | |
180 | if (k > sizeof buf) { | |
181 | /* bug: 'buf' is too small for this ciphersuite */ | |
182 | SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | for (j = 0; j < k; j++) | |
187 | buf[j] = c; | |
188 | c++; | |
189 | EVP_DigestInit_ex(&s1, EVP_sha1(), NULL); | |
190 | EVP_DigestUpdate(&s1, buf, k); | |
191 | EVP_DigestUpdate(&s1, s->session->master_key, | |
192 | s->session->master_key_length); | |
193 | EVP_DigestUpdate(&s1, s->s3->server_random, SSL3_RANDOM_SIZE); | |
194 | EVP_DigestUpdate(&s1, s->s3->client_random, SSL3_RANDOM_SIZE); | |
195 | EVP_DigestFinal_ex(&s1, smd, NULL); | |
196 | ||
197 | EVP_DigestInit_ex(&m5, EVP_md5(), NULL); | |
198 | EVP_DigestUpdate(&m5, s->session->master_key, | |
199 | s->session->master_key_length); | |
200 | EVP_DigestUpdate(&m5, smd, SHA_DIGEST_LENGTH); | |
201 | if ((int)(i + MD5_DIGEST_LENGTH) > num) { | |
202 | EVP_DigestFinal_ex(&m5, smd, NULL); | |
203 | memcpy(km, smd, (num - i)); | |
204 | } else | |
205 | EVP_DigestFinal_ex(&m5, km, NULL); | |
206 | ||
207 | km += MD5_DIGEST_LENGTH; | |
208 | } | |
209 | OPENSSL_cleanse(smd, sizeof(smd)); | |
210 | EVP_MD_CTX_cleanup(&m5); | |
211 | EVP_MD_CTX_cleanup(&s1); | |
212 | return 1; | |
213 | } | |
214 | ||
215 | int ssl3_change_cipher_state(SSL *s, int which) | |
216 | { | |
217 | unsigned char *p, *mac_secret; | |
218 | unsigned char exp_key[EVP_MAX_KEY_LENGTH]; | |
219 | unsigned char exp_iv[EVP_MAX_IV_LENGTH]; | |
220 | unsigned char *ms, *key, *iv, *er1, *er2; | |
221 | EVP_CIPHER_CTX *dd; | |
222 | const EVP_CIPHER *c; | |
223 | #ifndef OPENSSL_NO_COMP | |
224 | COMP_METHOD *comp; | |
225 | #endif | |
226 | const EVP_MD *m; | |
227 | EVP_MD_CTX md; | |
228 | int is_exp, n, i, j, k, cl; | |
229 | int reuse_dd = 0; | |
230 | ||
231 | is_exp = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); | |
232 | c = s->s3->tmp.new_sym_enc; | |
233 | m = s->s3->tmp.new_hash; | |
234 | /* m == NULL will lead to a crash later */ | |
235 | OPENSSL_assert(m); | |
236 | #ifndef OPENSSL_NO_COMP | |
237 | if (s->s3->tmp.new_compression == NULL) | |
238 | comp = NULL; | |
239 | else | |
240 | comp = s->s3->tmp.new_compression->method; | |
241 | #endif | |
242 | ||
243 | if (which & SSL3_CC_READ) { | |
244 | if (s->enc_read_ctx != NULL) | |
245 | reuse_dd = 1; | |
246 | else if ((s->enc_read_ctx = | |
247 | OPENSSL_malloc(sizeof(*s->enc_read_ctx))) == NULL) | |
248 | goto err; | |
249 | else | |
250 | /* | |
251 | * make sure it's intialized in case we exit later with an error | |
252 | */ | |
253 | EVP_CIPHER_CTX_init(s->enc_read_ctx); | |
254 | dd = s->enc_read_ctx; | |
255 | ||
256 | if (!ssl_replace_hash(&s->read_hash, m)) { | |
257 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); | |
258 | goto err2; | |
259 | } | |
260 | #ifndef OPENSSL_NO_COMP | |
261 | /* COMPRESS */ | |
262 | COMP_CTX_free(s->expand); | |
263 | s->expand = NULL; | |
264 | if (comp != NULL) { | |
265 | s->expand = COMP_CTX_new(comp); | |
266 | if (s->expand == NULL) { | |
267 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, | |
268 | SSL_R_COMPRESSION_LIBRARY_ERROR); | |
269 | goto err2; | |
270 | } | |
271 | if (!RECORD_LAYER_setup_comp_buffer(&s->rlayer)) | |
272 | goto err; | |
273 | } | |
274 | #endif | |
275 | RECORD_LAYER_reset_read_sequence(&s->rlayer); | |
276 | mac_secret = &(s->s3->read_mac_secret[0]); | |
277 | } else { | |
278 | if (s->enc_write_ctx != NULL) | |
279 | reuse_dd = 1; | |
280 | else if ((s->enc_write_ctx = | |
281 | OPENSSL_malloc(sizeof(*s->enc_write_ctx))) == NULL) | |
282 | goto err; | |
283 | else | |
284 | /* | |
285 | * make sure it's intialized in case we exit later with an error | |
286 | */ | |
287 | EVP_CIPHER_CTX_init(s->enc_write_ctx); | |
288 | dd = s->enc_write_ctx; | |
289 | if (!ssl_replace_hash(&s->write_hash, m)) { | |
290 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); | |
291 | goto err2; | |
292 | } | |
293 | #ifndef OPENSSL_NO_COMP | |
294 | /* COMPRESS */ | |
295 | COMP_CTX_free(s->compress); | |
296 | s->compress = NULL; | |
297 | if (comp != NULL) { | |
298 | s->compress = COMP_CTX_new(comp); | |
299 | if (s->compress == NULL) { | |
300 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, | |
301 | SSL_R_COMPRESSION_LIBRARY_ERROR); | |
302 | goto err2; | |
303 | } | |
304 | } | |
305 | #endif | |
306 | RECORD_LAYER_reset_write_sequence(&s->rlayer); | |
307 | mac_secret = &(s->s3->write_mac_secret[0]); | |
308 | } | |
309 | ||
310 | if (reuse_dd) | |
311 | EVP_CIPHER_CTX_cleanup(dd); | |
312 | ||
313 | p = s->s3->tmp.key_block; | |
314 | i = EVP_MD_size(m); | |
315 | if (i < 0) | |
316 | goto err2; | |
317 | cl = EVP_CIPHER_key_length(c); | |
318 | j = is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? | |
319 | cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; | |
320 | /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ | |
321 | k = EVP_CIPHER_iv_length(c); | |
322 | if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || | |
323 | (which == SSL3_CHANGE_CIPHER_SERVER_READ)) { | |
324 | ms = &(p[0]); | |
325 | n = i + i; | |
326 | key = &(p[n]); | |
327 | n += j + j; | |
328 | iv = &(p[n]); | |
329 | n += k + k; | |
330 | er1 = &(s->s3->client_random[0]); | |
331 | er2 = &(s->s3->server_random[0]); | |
332 | } else { | |
333 | n = i; | |
334 | ms = &(p[n]); | |
335 | n += i + j; | |
336 | key = &(p[n]); | |
337 | n += j + k; | |
338 | iv = &(p[n]); | |
339 | n += k; | |
340 | er1 = &(s->s3->server_random[0]); | |
341 | er2 = &(s->s3->client_random[0]); | |
342 | } | |
343 | ||
344 | if (n > s->s3->tmp.key_block_length) { | |
345 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); | |
346 | goto err2; | |
347 | } | |
348 | ||
349 | EVP_MD_CTX_init(&md); | |
350 | memcpy(mac_secret, ms, i); | |
351 | if (is_exp) { | |
352 | /* | |
353 | * In here I set both the read and write key/iv to the same value | |
354 | * since only the correct one will be used :-). | |
355 | */ | |
356 | EVP_DigestInit_ex(&md, EVP_md5(), NULL); | |
357 | EVP_DigestUpdate(&md, key, j); | |
358 | EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE); | |
359 | EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE); | |
360 | EVP_DigestFinal_ex(&md, &(exp_key[0]), NULL); | |
361 | key = &(exp_key[0]); | |
362 | ||
363 | if (k > 0) { | |
364 | EVP_DigestInit_ex(&md, EVP_md5(), NULL); | |
365 | EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE); | |
366 | EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE); | |
367 | EVP_DigestFinal_ex(&md, &(exp_iv[0]), NULL); | |
368 | iv = &(exp_iv[0]); | |
369 | } | |
370 | } | |
371 | ||
372 | EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE)); | |
373 | ||
374 | #ifdef OPENSSL_SSL_TRACE_CRYPTO | |
375 | if (s->msg_callback) { | |
376 | ||
377 | int wh = which & SSL3_CC_WRITE ? | |
378 | TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ; | |
379 | s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC, | |
380 | mac_secret, EVP_MD_size(m), s, s->msg_callback_arg); | |
381 | if (c->key_len) | |
382 | s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY, | |
383 | key, c->key_len, s, s->msg_callback_arg); | |
384 | if (k) { | |
385 | s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV, | |
386 | iv, k, s, s->msg_callback_arg); | |
387 | } | |
388 | } | |
389 | #endif | |
390 | ||
391 | OPENSSL_cleanse(exp_key, sizeof(exp_key)); | |
392 | OPENSSL_cleanse(exp_iv, sizeof(exp_iv)); | |
393 | EVP_MD_CTX_cleanup(&md); | |
394 | return (1); | |
395 | err: | |
396 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE); | |
397 | err2: | |
398 | OPENSSL_cleanse(exp_key, sizeof(exp_key)); | |
399 | OPENSSL_cleanse(exp_iv, sizeof(exp_iv)); | |
400 | return (0); | |
401 | } | |
402 | ||
403 | int ssl3_setup_key_block(SSL *s) | |
404 | { | |
405 | unsigned char *p; | |
406 | const EVP_CIPHER *c; | |
407 | const EVP_MD *hash; | |
408 | int num; | |
409 | int ret = 0; | |
410 | SSL_COMP *comp; | |
411 | ||
412 | if (s->s3->tmp.key_block_length != 0) | |
413 | return (1); | |
414 | ||
415 | if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, &comp, 0)) { | |
416 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); | |
417 | return (0); | |
418 | } | |
419 | ||
420 | s->s3->tmp.new_sym_enc = c; | |
421 | s->s3->tmp.new_hash = hash; | |
422 | #ifdef OPENSSL_NO_COMP | |
423 | s->s3->tmp.new_compression = NULL; | |
424 | #else | |
425 | s->s3->tmp.new_compression = comp; | |
426 | #endif | |
427 | ||
428 | num = EVP_MD_size(hash); | |
429 | if (num < 0) | |
430 | return 0; | |
431 | ||
432 | num = EVP_CIPHER_key_length(c) + num + EVP_CIPHER_iv_length(c); | |
433 | num *= 2; | |
434 | ||
435 | ssl3_cleanup_key_block(s); | |
436 | ||
437 | if ((p = OPENSSL_malloc(num)) == NULL) | |
438 | goto err; | |
439 | ||
440 | s->s3->tmp.key_block_length = num; | |
441 | s->s3->tmp.key_block = p; | |
442 | ||
443 | ret = ssl3_generate_key_block(s, p, num); | |
444 | ||
445 | if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) { | |
446 | /* | |
447 | * enable vulnerability countermeasure for CBC ciphers with known-IV | |
448 | * problem (http://www.openssl.org/~bodo/tls-cbc.txt) | |
449 | */ | |
450 | s->s3->need_empty_fragments = 1; | |
451 | ||
452 | if (s->session->cipher != NULL) { | |
453 | if (s->session->cipher->algorithm_enc == SSL_eNULL) | |
454 | s->s3->need_empty_fragments = 0; | |
455 | ||
456 | #ifndef OPENSSL_NO_RC4 | |
457 | if (s->session->cipher->algorithm_enc == SSL_RC4) | |
458 | s->s3->need_empty_fragments = 0; | |
459 | #endif | |
460 | } | |
461 | } | |
462 | ||
463 | return ret; | |
464 | ||
465 | err: | |
466 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE); | |
467 | return (0); | |
468 | } | |
469 | ||
470 | void ssl3_cleanup_key_block(SSL *s) | |
471 | { | |
472 | OPENSSL_clear_free(s->s3->tmp.key_block, s->s3->tmp.key_block_length); | |
473 | s->s3->tmp.key_block = NULL; | |
474 | s->s3->tmp.key_block_length = 0; | |
475 | } | |
476 | ||
477 | void ssl3_init_finished_mac(SSL *s) | |
478 | { | |
479 | BIO_free(s->s3->handshake_buffer); | |
480 | ssl3_free_digest_list(s); | |
481 | s->s3->handshake_buffer = BIO_new(BIO_s_mem()); | |
482 | (void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE); | |
483 | } | |
484 | ||
485 | void ssl3_free_digest_list(SSL *s) | |
486 | { | |
487 | int i; | |
488 | if (!s->s3->handshake_dgst) | |
489 | return; | |
490 | for (i = 0; i < SSL_MAX_DIGEST; i++) { | |
491 | if (s->s3->handshake_dgst[i]) | |
492 | EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]); | |
493 | } | |
494 | OPENSSL_free(s->s3->handshake_dgst); | |
495 | s->s3->handshake_dgst = NULL; | |
496 | } | |
497 | ||
498 | void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) | |
499 | { | |
500 | if (s->s3->handshake_buffer | |
501 | && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) { | |
502 | BIO_write(s->s3->handshake_buffer, (void *)buf, len); | |
503 | } else { | |
504 | int i; | |
505 | for (i = 0; i < SSL_MAX_DIGEST; i++) { | |
506 | if (s->s3->handshake_dgst[i] != NULL) | |
507 | EVP_DigestUpdate(s->s3->handshake_dgst[i], buf, len); | |
508 | } | |
509 | } | |
510 | } | |
511 | ||
512 | int ssl3_digest_cached_records(SSL *s) | |
513 | { | |
514 | int i; | |
515 | long mask; | |
516 | const EVP_MD *md; | |
517 | long hdatalen; | |
518 | void *hdata; | |
519 | ||
520 | /* Allocate handshake_dgst array */ | |
521 | ssl3_free_digest_list(s); | |
522 | s->s3->handshake_dgst = | |
523 | OPENSSL_malloc(sizeof(*s->s3->handshake_dgst) * SSL_MAX_DIGEST); | |
524 | if (s->s3->handshake_dgst == NULL) { | |
525 | SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE); | |
526 | return 0; | |
527 | } | |
528 | memset(s->s3->handshake_dgst, 0, | |
529 | sizeof(*s->s3->handshake_dgst) * SSL_MAX_DIGEST); | |
530 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); | |
531 | if (hdatalen <= 0) { | |
532 | SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | /* Loop through bitso of algorithm2 field and create MD_CTX-es */ | |
537 | for (i = 0; ssl_get_handshake_digest(i, &mask, &md); i++) { | |
538 | if ((mask & ssl_get_algorithm2(s)) && md) { | |
539 | s->s3->handshake_dgst[i] = EVP_MD_CTX_create(); | |
540 | if (EVP_MD_nid(md) == NID_md5) { | |
541 | EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i], | |
542 | EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); | |
543 | } | |
544 | EVP_DigestInit_ex(s->s3->handshake_dgst[i], md, NULL); | |
545 | EVP_DigestUpdate(s->s3->handshake_dgst[i], hdata, hdatalen); | |
546 | } else { | |
547 | s->s3->handshake_dgst[i] = NULL; | |
548 | } | |
549 | } | |
550 | if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) { | |
551 | /* Free handshake_buffer BIO */ | |
552 | BIO_free(s->s3->handshake_buffer); | |
553 | s->s3->handshake_buffer = NULL; | |
554 | } | |
555 | ||
556 | return 1; | |
557 | } | |
558 | ||
559 | int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p) | |
560 | { | |
561 | return (ssl3_handshake_mac(s, md_nid, NULL, 0, p)); | |
562 | } | |
563 | ||
564 | int ssl3_final_finish_mac(SSL *s, | |
565 | const char *sender, int len, unsigned char *p) | |
566 | { | |
567 | int ret, sha1len; | |
568 | ret = ssl3_handshake_mac(s, NID_md5, sender, len, p); | |
569 | if (ret == 0) | |
570 | return 0; | |
571 | ||
572 | p += ret; | |
573 | ||
574 | sha1len = ssl3_handshake_mac(s, NID_sha1, sender, len, p); | |
575 | if (sha1len == 0) | |
576 | return 0; | |
577 | ||
578 | ret += sha1len; | |
579 | return (ret); | |
580 | } | |
581 | ||
582 | static int ssl3_handshake_mac(SSL *s, int md_nid, | |
583 | const char *sender, int len, unsigned char *p) | |
584 | { | |
585 | unsigned int ret; | |
586 | int npad, n; | |
587 | unsigned int i; | |
588 | unsigned char md_buf[EVP_MAX_MD_SIZE]; | |
589 | EVP_MD_CTX ctx, *d = NULL; | |
590 | ||
591 | if (s->s3->handshake_buffer) | |
592 | if (!ssl3_digest_cached_records(s)) | |
593 | return 0; | |
594 | ||
595 | /* | |
596 | * Search for digest of specified type in the handshake_dgst array | |
597 | */ | |
598 | for (i = 0; i < SSL_MAX_DIGEST; i++) { | |
599 | if (s->s3->handshake_dgst[i] | |
600 | && EVP_MD_CTX_type(s->s3->handshake_dgst[i]) == md_nid) { | |
601 | d = s->s3->handshake_dgst[i]; | |
602 | break; | |
603 | } | |
604 | } | |
605 | if (!d) { | |
606 | SSLerr(SSL_F_SSL3_HANDSHAKE_MAC, SSL_R_NO_REQUIRED_DIGEST); | |
607 | return 0; | |
608 | } | |
609 | EVP_MD_CTX_init(&ctx); | |
610 | EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); | |
611 | EVP_MD_CTX_copy_ex(&ctx, d); | |
612 | n = EVP_MD_CTX_size(&ctx); | |
613 | if (n < 0) | |
614 | return 0; | |
615 | ||
616 | npad = (48 / n) * n; | |
617 | if (sender != NULL) | |
618 | EVP_DigestUpdate(&ctx, sender, len); | |
619 | EVP_DigestUpdate(&ctx, s->session->master_key, | |
620 | s->session->master_key_length); | |
621 | EVP_DigestUpdate(&ctx, ssl3_pad_1, npad); | |
622 | EVP_DigestFinal_ex(&ctx, md_buf, &i); | |
623 | ||
624 | EVP_DigestInit_ex(&ctx, EVP_MD_CTX_md(&ctx), NULL); | |
625 | EVP_DigestUpdate(&ctx, s->session->master_key, | |
626 | s->session->master_key_length); | |
627 | EVP_DigestUpdate(&ctx, ssl3_pad_2, npad); | |
628 | EVP_DigestUpdate(&ctx, md_buf, i); | |
629 | EVP_DigestFinal_ex(&ctx, p, &ret); | |
630 | ||
631 | EVP_MD_CTX_cleanup(&ctx); | |
632 | ||
633 | return ((int)ret); | |
634 | } | |
635 | ||
636 | int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, | |
637 | int len) | |
638 | { | |
639 | static const unsigned char *salt[3] = { | |
640 | #ifndef CHARSET_EBCDIC | |
641 | (const unsigned char *)"A", | |
642 | (const unsigned char *)"BB", | |
643 | (const unsigned char *)"CCC", | |
644 | #else | |
645 | (const unsigned char *)"\x41", | |
646 | (const unsigned char *)"\x42\x42", | |
647 | (const unsigned char *)"\x43\x43\x43", | |
648 | #endif | |
649 | }; | |
650 | unsigned char buf[EVP_MAX_MD_SIZE]; | |
651 | EVP_MD_CTX ctx; | |
652 | int i, ret = 0; | |
653 | unsigned int n; | |
654 | #ifdef OPENSSL_SSL_TRACE_CRYPTO | |
655 | unsigned char *tmpout = out; | |
656 | #endif | |
657 | ||
658 | EVP_MD_CTX_init(&ctx); | |
659 | for (i = 0; i < 3; i++) { | |
660 | EVP_DigestInit_ex(&ctx, s->ctx->sha1, NULL); | |
661 | EVP_DigestUpdate(&ctx, salt[i], strlen((const char *)salt[i])); | |
662 | EVP_DigestUpdate(&ctx, p, len); | |
663 | EVP_DigestUpdate(&ctx, &(s->s3->client_random[0]), SSL3_RANDOM_SIZE); | |
664 | EVP_DigestUpdate(&ctx, &(s->s3->server_random[0]), SSL3_RANDOM_SIZE); | |
665 | EVP_DigestFinal_ex(&ctx, buf, &n); | |
666 | ||
667 | EVP_DigestInit_ex(&ctx, s->ctx->md5, NULL); | |
668 | EVP_DigestUpdate(&ctx, p, len); | |
669 | EVP_DigestUpdate(&ctx, buf, n); | |
670 | EVP_DigestFinal_ex(&ctx, out, &n); | |
671 | out += n; | |
672 | ret += n; | |
673 | } | |
674 | EVP_MD_CTX_cleanup(&ctx); | |
675 | ||
676 | #ifdef OPENSSL_SSL_TRACE_CRYPTO | |
677 | if (s->msg_callback) { | |
678 | s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER, | |
679 | p, len, s, s->msg_callback_arg); | |
680 | s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM, | |
681 | s->s3->client_random, SSL3_RANDOM_SIZE, | |
682 | s, s->msg_callback_arg); | |
683 | s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM, | |
684 | s->s3->server_random, SSL3_RANDOM_SIZE, | |
685 | s, s->msg_callback_arg); | |
686 | s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER, | |
687 | tmpout, SSL3_MASTER_SECRET_SIZE, | |
688 | s, s->msg_callback_arg); | |
689 | } | |
690 | #endif | |
691 | OPENSSL_cleanse(buf, sizeof(buf)); | |
692 | return (ret); | |
693 | } | |
694 | ||
695 | int ssl3_alert_code(int code) | |
696 | { | |
697 | switch (code) { | |
698 | case SSL_AD_CLOSE_NOTIFY: | |
699 | return (SSL3_AD_CLOSE_NOTIFY); | |
700 | case SSL_AD_UNEXPECTED_MESSAGE: | |
701 | return (SSL3_AD_UNEXPECTED_MESSAGE); | |
702 | case SSL_AD_BAD_RECORD_MAC: | |
703 | return (SSL3_AD_BAD_RECORD_MAC); | |
704 | case SSL_AD_DECRYPTION_FAILED: | |
705 | return (SSL3_AD_BAD_RECORD_MAC); | |
706 | case SSL_AD_RECORD_OVERFLOW: | |
707 | return (SSL3_AD_BAD_RECORD_MAC); | |
708 | case SSL_AD_DECOMPRESSION_FAILURE: | |
709 | return (SSL3_AD_DECOMPRESSION_FAILURE); | |
710 | case SSL_AD_HANDSHAKE_FAILURE: | |
711 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
712 | case SSL_AD_NO_CERTIFICATE: | |
713 | return (SSL3_AD_NO_CERTIFICATE); | |
714 | case SSL_AD_BAD_CERTIFICATE: | |
715 | return (SSL3_AD_BAD_CERTIFICATE); | |
716 | case SSL_AD_UNSUPPORTED_CERTIFICATE: | |
717 | return (SSL3_AD_UNSUPPORTED_CERTIFICATE); | |
718 | case SSL_AD_CERTIFICATE_REVOKED: | |
719 | return (SSL3_AD_CERTIFICATE_REVOKED); | |
720 | case SSL_AD_CERTIFICATE_EXPIRED: | |
721 | return (SSL3_AD_CERTIFICATE_EXPIRED); | |
722 | case SSL_AD_CERTIFICATE_UNKNOWN: | |
723 | return (SSL3_AD_CERTIFICATE_UNKNOWN); | |
724 | case SSL_AD_ILLEGAL_PARAMETER: | |
725 | return (SSL3_AD_ILLEGAL_PARAMETER); | |
726 | case SSL_AD_UNKNOWN_CA: | |
727 | return (SSL3_AD_BAD_CERTIFICATE); | |
728 | case SSL_AD_ACCESS_DENIED: | |
729 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
730 | case SSL_AD_DECODE_ERROR: | |
731 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
732 | case SSL_AD_DECRYPT_ERROR: | |
733 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
734 | case SSL_AD_EXPORT_RESTRICTION: | |
735 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
736 | case SSL_AD_PROTOCOL_VERSION: | |
737 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
738 | case SSL_AD_INSUFFICIENT_SECURITY: | |
739 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
740 | case SSL_AD_INTERNAL_ERROR: | |
741 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
742 | case SSL_AD_USER_CANCELLED: | |
743 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
744 | case SSL_AD_NO_RENEGOTIATION: | |
745 | return (-1); /* Don't send it :-) */ | |
746 | case SSL_AD_UNSUPPORTED_EXTENSION: | |
747 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
748 | case SSL_AD_CERTIFICATE_UNOBTAINABLE: | |
749 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
750 | case SSL_AD_UNRECOGNIZED_NAME: | |
751 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
752 | case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: | |
753 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
754 | case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: | |
755 | return (SSL3_AD_HANDSHAKE_FAILURE); | |
756 | case SSL_AD_UNKNOWN_PSK_IDENTITY: | |
757 | return (TLS1_AD_UNKNOWN_PSK_IDENTITY); | |
758 | case SSL_AD_INAPPROPRIATE_FALLBACK: | |
759 | return (TLS1_AD_INAPPROPRIATE_FALLBACK); | |
760 | default: | |
761 | return (-1); | |
762 | } | |
763 | } |