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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 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 | static unsigned char ssl3_pad_2[48]={ | |
152 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, | |
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 | static int ssl3_handshake_mac(SSL *s, int md_nid, | |
159 | const char *sender, int len, unsigned char *p); | |
160 | static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) | |
161 | { | |
162 | EVP_MD_CTX m5; | |
163 | EVP_MD_CTX s1; | |
164 | unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; | |
165 | unsigned char c='A'; | |
166 | unsigned int i,j,k; | |
167 | ||
168 | #ifdef CHARSET_EBCDIC | |
169 | c = os_toascii[c]; /*'A' in ASCII */ | |
170 | #endif | |
171 | k=0; | |
172 | EVP_MD_CTX_init(&m5); | |
173 | EVP_MD_CTX_init(&s1); | |
174 | for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH) | |
175 | { | |
176 | k++; | |
177 | if (k > sizeof buf) | |
178 | { | |
179 | /* bug: 'buf' is too small for this ciphersuite */ | |
180 | SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | for (j=0; j<k; j++) | |
185 | buf[j]=c; | |
186 | c++; | |
187 | EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); | |
188 | EVP_DigestUpdate(&s1,buf,k); | |
189 | EVP_DigestUpdate(&s1,s->session->master_key, | |
190 | s->session->master_key_length); | |
191 | EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); | |
192 | EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); | |
193 | EVP_DigestFinal_ex(&s1,smd,NULL); | |
194 | ||
195 | EVP_DigestInit_ex(&m5,EVP_md5(), NULL); | |
196 | EVP_DigestUpdate(&m5,s->session->master_key, | |
197 | s->session->master_key_length); | |
198 | EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); | |
199 | if ((int)(i+MD5_DIGEST_LENGTH) > num) | |
200 | { | |
201 | EVP_DigestFinal_ex(&m5,smd,NULL); | |
202 | memcpy(km,smd,(num-i)); | |
203 | } | |
204 | else | |
205 | EVP_DigestFinal_ex(&m5,km,NULL); | |
206 | ||
207 | km+=MD5_DIGEST_LENGTH; | |
208 | } | |
209 | OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); | |
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,*key_block,*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 | #ifndef OPENSSL_NO_COMP | |
235 | if (s->s3->tmp.new_compression == NULL) | |
236 | comp=NULL; | |
237 | else | |
238 | comp=s->s3->tmp.new_compression->method; | |
239 | #endif | |
240 | key_block=s->s3->tmp.key_block; | |
241 | ||
242 | if (which & SSL3_CC_READ) | |
243 | { | |
244 | if (s->enc_read_ctx != NULL) | |
245 | reuse_dd = 1; | |
246 | else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) | |
247 | goto err; | |
248 | else | |
249 | /* make sure it's intialized in case we exit later with an error */ | |
250 | EVP_CIPHER_CTX_init(s->enc_read_ctx); | |
251 | dd= s->enc_read_ctx; | |
252 | ||
253 | ssl_replace_hash(&s->read_hash,m); | |
254 | #ifndef OPENSSL_NO_COMP | |
255 | /* COMPRESS */ | |
256 | if (s->expand != NULL) | |
257 | { | |
258 | COMP_CTX_free(s->expand); | |
259 | s->expand=NULL; | |
260 | } | |
261 | if (comp != NULL) | |
262 | { | |
263 | s->expand=COMP_CTX_new(comp); | |
264 | if (s->expand == NULL) | |
265 | { | |
266 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); | |
267 | goto err2; | |
268 | } | |
269 | if (s->s3->rrec.comp == NULL) | |
270 | s->s3->rrec.comp=(unsigned char *) | |
271 | OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); | |
272 | if (s->s3->rrec.comp == NULL) | |
273 | goto err; | |
274 | } | |
275 | #endif | |
276 | memset(&(s->s3->read_sequence[0]),0,8); | |
277 | mac_secret= &(s->s3->read_mac_secret[0]); | |
278 | } | |
279 | else | |
280 | { | |
281 | if (s->enc_write_ctx != NULL) | |
282 | reuse_dd = 1; | |
283 | else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) | |
284 | goto err; | |
285 | else | |
286 | /* make sure it's intialized in case we exit later with an error */ | |
287 | EVP_CIPHER_CTX_init(s->enc_write_ctx); | |
288 | dd= s->enc_write_ctx; | |
289 | ssl_replace_hash(&s->write_hash,m); | |
290 | #ifndef OPENSSL_NO_COMP | |
291 | /* COMPRESS */ | |
292 | if (s->compress != NULL) | |
293 | { | |
294 | COMP_CTX_free(s->compress); | |
295 | s->compress=NULL; | |
296 | } | |
297 | if (comp != NULL) | |
298 | { | |
299 | s->compress=COMP_CTX_new(comp); | |
300 | if (s->compress == NULL) | |
301 | { | |
302 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); | |
303 | goto err2; | |
304 | } | |
305 | } | |
306 | #endif | |
307 | memset(&(s->s3->write_sequence[0]),0,8); | |
308 | mac_secret= &(s->s3->write_mac_secret[0]); | |
309 | } | |
310 | ||
311 | if (reuse_dd) | |
312 | EVP_CIPHER_CTX_cleanup(dd); | |
313 | ||
314 | p=s->s3->tmp.key_block; | |
315 | i=EVP_MD_size(m); | |
316 | cl=EVP_CIPHER_key_length(c); | |
317 | j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? | |
318 | cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; | |
319 | /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ | |
320 | k=EVP_CIPHER_iv_length(c); | |
321 | if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || | |
322 | (which == SSL3_CHANGE_CIPHER_SERVER_READ)) | |
323 | { | |
324 | ms= &(p[ 0]); n=i+i; | |
325 | key= &(p[ n]); n+=j+j; | |
326 | iv= &(p[ n]); n+=k+k; | |
327 | er1= &(s->s3->client_random[0]); | |
328 | er2= &(s->s3->server_random[0]); | |
329 | } | |
330 | else | |
331 | { | |
332 | n=i; | |
333 | ms= &(p[ n]); n+=i+j; | |
334 | key= &(p[ n]); n+=j+k; | |
335 | iv= &(p[ n]); n+=k; | |
336 | er1= &(s->s3->server_random[0]); | |
337 | er2= &(s->s3->client_random[0]); | |
338 | } | |
339 | ||
340 | if (n > s->s3->tmp.key_block_length) | |
341 | { | |
342 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); | |
343 | goto err2; | |
344 | } | |
345 | ||
346 | EVP_MD_CTX_init(&md); | |
347 | memcpy(mac_secret,ms,i); | |
348 | if (is_exp) | |
349 | { | |
350 | /* In here I set both the read and write key/iv to the | |
351 | * same value since only the correct one will be used :-). | |
352 | */ | |
353 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); | |
354 | EVP_DigestUpdate(&md,key,j); | |
355 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); | |
356 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); | |
357 | EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); | |
358 | key= &(exp_key[0]); | |
359 | ||
360 | if (k > 0) | |
361 | { | |
362 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); | |
363 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); | |
364 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); | |
365 | EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); | |
366 | iv= &(exp_iv[0]); | |
367 | } | |
368 | } | |
369 | ||
370 | s->session->key_arg_length=0; | |
371 | ||
372 | EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); | |
373 | ||
374 | OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); | |
375 | OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); | |
376 | EVP_MD_CTX_cleanup(&md); | |
377 | return(1); | |
378 | err: | |
379 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); | |
380 | err2: | |
381 | return(0); | |
382 | } | |
383 | ||
384 | int ssl3_setup_key_block(SSL *s) | |
385 | { | |
386 | unsigned char *p; | |
387 | const EVP_CIPHER *c; | |
388 | const EVP_MD *hash; | |
389 | int num; | |
390 | int ret = 0; | |
391 | SSL_COMP *comp; | |
392 | ||
393 | if (s->s3->tmp.key_block_length != 0) | |
394 | return(1); | |
395 | ||
396 | if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp)) | |
397 | { | |
398 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); | |
399 | return(0); | |
400 | } | |
401 | ||
402 | s->s3->tmp.new_sym_enc=c; | |
403 | s->s3->tmp.new_hash=hash; | |
404 | #ifdef OPENSSL_NO_COMP | |
405 | s->s3->tmp.new_compression=NULL; | |
406 | #else | |
407 | s->s3->tmp.new_compression=comp; | |
408 | #endif | |
409 | ||
410 | num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c); | |
411 | num*=2; | |
412 | ||
413 | ssl3_cleanup_key_block(s); | |
414 | ||
415 | if ((p=OPENSSL_malloc(num)) == NULL) | |
416 | goto err; | |
417 | ||
418 | s->s3->tmp.key_block_length=num; | |
419 | s->s3->tmp.key_block=p; | |
420 | ||
421 | ret = ssl3_generate_key_block(s,p,num); | |
422 | ||
423 | if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) | |
424 | { | |
425 | /* enable vulnerability countermeasure for CBC ciphers with | |
426 | * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) | |
427 | */ | |
428 | s->s3->need_empty_fragments = 1; | |
429 | ||
430 | if (s->session->cipher != NULL) | |
431 | { | |
432 | if (s->session->cipher->algorithm_enc == SSL_eNULL) | |
433 | s->s3->need_empty_fragments = 0; | |
434 | ||
435 | #ifndef OPENSSL_NO_RC4 | |
436 | if (s->session->cipher->algorithm_enc == SSL_RC4) | |
437 | s->s3->need_empty_fragments = 0; | |
438 | #endif | |
439 | } | |
440 | } | |
441 | ||
442 | return ret; | |
443 | ||
444 | err: | |
445 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); | |
446 | return(0); | |
447 | } | |
448 | ||
449 | void ssl3_cleanup_key_block(SSL *s) | |
450 | { | |
451 | if (s->s3->tmp.key_block != NULL) | |
452 | { | |
453 | OPENSSL_cleanse(s->s3->tmp.key_block, | |
454 | s->s3->tmp.key_block_length); | |
455 | OPENSSL_free(s->s3->tmp.key_block); | |
456 | s->s3->tmp.key_block=NULL; | |
457 | } | |
458 | s->s3->tmp.key_block_length=0; | |
459 | } | |
460 | ||
461 | int ssl3_enc(SSL *s, int send) | |
462 | { | |
463 | SSL3_RECORD *rec; | |
464 | EVP_CIPHER_CTX *ds; | |
465 | unsigned long l; | |
466 | int bs,i; | |
467 | const EVP_CIPHER *enc; | |
468 | ||
469 | if (send) | |
470 | { | |
471 | ds=s->enc_write_ctx; | |
472 | rec= &(s->s3->wrec); | |
473 | if (s->enc_write_ctx == NULL) | |
474 | enc=NULL; | |
475 | else | |
476 | enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); | |
477 | } | |
478 | else | |
479 | { | |
480 | ds=s->enc_read_ctx; | |
481 | rec= &(s->s3->rrec); | |
482 | if (s->enc_read_ctx == NULL) | |
483 | enc=NULL; | |
484 | else | |
485 | enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); | |
486 | } | |
487 | ||
488 | if ((s->session == NULL) || (ds == NULL) || | |
489 | (enc == NULL)) | |
490 | { | |
491 | memmove(rec->data,rec->input,rec->length); | |
492 | rec->input=rec->data; | |
493 | } | |
494 | else | |
495 | { | |
496 | l=rec->length; | |
497 | bs=EVP_CIPHER_block_size(ds->cipher); | |
498 | ||
499 | /* COMPRESS */ | |
500 | ||
501 | if ((bs != 1) && send) | |
502 | { | |
503 | i=bs-((int)l%bs); | |
504 | ||
505 | /* we need to add 'i-1' padding bytes */ | |
506 | l+=i; | |
507 | rec->length+=i; | |
508 | rec->input[l-1]=(i-1); | |
509 | } | |
510 | ||
511 | if (!send) | |
512 | { | |
513 | if (l == 0 || l%bs != 0) | |
514 | { | |
515 | SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); | |
516 | ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); | |
517 | return 0; | |
518 | } | |
519 | /* otherwise, rec->length >= bs */ | |
520 | } | |
521 | ||
522 | EVP_Cipher(ds,rec->data,rec->input,l); | |
523 | ||
524 | if ((bs != 1) && !send) | |
525 | { | |
526 | i=rec->data[l-1]+1; | |
527 | /* SSL 3.0 bounds the number of padding bytes by the block size; | |
528 | * padding bytes (except the last one) are arbitrary */ | |
529 | if (i > bs) | |
530 | { | |
531 | /* Incorrect padding. SSLerr() and ssl3_alert are done | |
532 | * by caller: we don't want to reveal whether this is | |
533 | * a decryption error or a MAC verification failure | |
534 | * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ | |
535 | return -1; | |
536 | } | |
537 | /* now i <= bs <= rec->length */ | |
538 | rec->length-=i; | |
539 | } | |
540 | } | |
541 | return(1); | |
542 | } | |
543 | ||
544 | void ssl3_init_finished_mac(SSL *s) | |
545 | { | |
546 | if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer); | |
547 | if (s->s3->handshake_dgst) ssl3_free_digest_list(s); | |
548 | s->s3->handshake_buffer=BIO_new(BIO_s_mem()); | |
549 | (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE); | |
550 | } | |
551 | ||
552 | void ssl3_free_digest_list(SSL *s) | |
553 | { | |
554 | int i; | |
555 | if (!s->s3->handshake_dgst) return; | |
556 | for (i=0;i<SSL_MAX_DIGEST;i++) | |
557 | { | |
558 | if (s->s3->handshake_dgst[i]) | |
559 | EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]); | |
560 | } | |
561 | OPENSSL_free(s->s3->handshake_dgst); | |
562 | s->s3->handshake_dgst=NULL; | |
563 | } | |
564 | ||
565 | ||
566 | ||
567 | void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) | |
568 | { | |
569 | if (s->s3->handshake_buffer) | |
570 | { | |
571 | BIO_write (s->s3->handshake_buffer,(void *)buf,len); | |
572 | } | |
573 | else | |
574 | { | |
575 | int i; | |
576 | for (i=0;i< SSL_MAX_DIGEST;i++) | |
577 | { | |
578 | if (s->s3->handshake_dgst[i]!= NULL) | |
579 | EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len); | |
580 | } | |
581 | } | |
582 | } | |
583 | ||
584 | int ssl3_digest_cached_records(SSL *s) | |
585 | { | |
586 | int i; | |
587 | long mask; | |
588 | const EVP_MD *md; | |
589 | long hdatalen; | |
590 | void *hdata; | |
591 | ||
592 | /* Allocate handshake_dgst array */ | |
593 | ssl3_free_digest_list(s); | |
594 | s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *)); | |
595 | memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *)); | |
596 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata); | |
597 | if (hdatalen <= 0) | |
598 | { | |
599 | SSLerr(SSL_F_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH); | |
600 | return 0; | |
601 | } | |
602 | ||
603 | /* Loop through bitso of algorithm2 field and create MD_CTX-es */ | |
604 | for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++) | |
605 | { | |
606 | if ((mask & s->s3->tmp.new_cipher->algorithm2) && md) | |
607 | { | |
608 | s->s3->handshake_dgst[i]=EVP_MD_CTX_create(); | |
609 | EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL); | |
610 | EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen); | |
611 | } | |
612 | else | |
613 | { | |
614 | s->s3->handshake_dgst[i]=NULL; | |
615 | } | |
616 | } | |
617 | /* Free handshake_buffer BIO */ | |
618 | BIO_free(s->s3->handshake_buffer); | |
619 | s->s3->handshake_buffer = NULL; | |
620 | ||
621 | return 1; | |
622 | } | |
623 | ||
624 | int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p) | |
625 | { | |
626 | return(ssl3_handshake_mac(s,md_nid,NULL,0,p)); | |
627 | } | |
628 | int ssl3_final_finish_mac(SSL *s, | |
629 | const char *sender, int len, unsigned char *p) | |
630 | { | |
631 | int ret; | |
632 | ret=ssl3_handshake_mac(s,NID_md5,sender,len,p); | |
633 | p+=ret; | |
634 | ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p); | |
635 | return(ret); | |
636 | } | |
637 | static int ssl3_handshake_mac(SSL *s, int md_nid, | |
638 | const char *sender, int len, unsigned char *p) | |
639 | { | |
640 | unsigned int ret; | |
641 | int npad,n; | |
642 | unsigned int i; | |
643 | unsigned char md_buf[EVP_MAX_MD_SIZE]; | |
644 | EVP_MD_CTX ctx,*d=NULL; | |
645 | ||
646 | if (s->s3->handshake_buffer) | |
647 | if (!ssl3_digest_cached_records(s)) | |
648 | return 0; | |
649 | ||
650 | /* Search for djgest of specified type in the handshake_dgst | |
651 | * array*/ | |
652 | for (i=0;i<SSL_MAX_DIGEST;i++) | |
653 | { | |
654 | if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) | |
655 | { | |
656 | d=s->s3->handshake_dgst[i]; | |
657 | break; | |
658 | } | |
659 | } | |
660 | if (!d) { | |
661 | SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST); | |
662 | return 0; | |
663 | } | |
664 | EVP_MD_CTX_init(&ctx); | |
665 | EVP_MD_CTX_copy_ex(&ctx,d); | |
666 | n=EVP_MD_CTX_size(&ctx); | |
667 | npad=(48/n)*n; | |
668 | if (sender != NULL) | |
669 | EVP_DigestUpdate(&ctx,sender,len); | |
670 | EVP_DigestUpdate(&ctx,s->session->master_key, | |
671 | s->session->master_key_length); | |
672 | EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); | |
673 | EVP_DigestFinal_ex(&ctx,md_buf,&i); | |
674 | ||
675 | EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); | |
676 | EVP_DigestUpdate(&ctx,s->session->master_key, | |
677 | s->session->master_key_length); | |
678 | EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); | |
679 | EVP_DigestUpdate(&ctx,md_buf,i); | |
680 | EVP_DigestFinal_ex(&ctx,p,&ret); | |
681 | ||
682 | EVP_MD_CTX_cleanup(&ctx); | |
683 | ||
684 | return((int)ret); | |
685 | } | |
686 | ||
687 | int ssl3_mac(SSL *ssl, unsigned char *md, int send) | |
688 | { | |
689 | SSL3_RECORD *rec; | |
690 | unsigned char *mac_sec,*seq; | |
691 | EVP_MD_CTX md_ctx; | |
692 | const EVP_MD_CTX *hash; | |
693 | unsigned char *p,rec_char; | |
694 | unsigned int md_size; | |
695 | int npad; | |
696 | ||
697 | if (send) | |
698 | { | |
699 | rec= &(ssl->s3->wrec); | |
700 | mac_sec= &(ssl->s3->write_mac_secret[0]); | |
701 | seq= &(ssl->s3->write_sequence[0]); | |
702 | hash=ssl->write_hash; | |
703 | } | |
704 | else | |
705 | { | |
706 | rec= &(ssl->s3->rrec); | |
707 | mac_sec= &(ssl->s3->read_mac_secret[0]); | |
708 | seq= &(ssl->s3->read_sequence[0]); | |
709 | hash=ssl->read_hash; | |
710 | } | |
711 | ||
712 | md_size=EVP_MD_CTX_size(hash); | |
713 | npad=(48/md_size)*md_size; | |
714 | ||
715 | /* Chop the digest off the end :-) */ | |
716 | EVP_MD_CTX_init(&md_ctx); | |
717 | ||
718 | EVP_MD_CTX_copy_ex( &md_ctx,hash); | |
719 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); | |
720 | EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); | |
721 | EVP_DigestUpdate(&md_ctx,seq,8); | |
722 | rec_char=rec->type; | |
723 | EVP_DigestUpdate(&md_ctx,&rec_char,1); | |
724 | p=md; | |
725 | s2n(rec->length,p); | |
726 | EVP_DigestUpdate(&md_ctx,md,2); | |
727 | EVP_DigestUpdate(&md_ctx,rec->input,rec->length); | |
728 | EVP_DigestFinal_ex( &md_ctx,md,NULL); | |
729 | ||
730 | EVP_MD_CTX_copy_ex( &md_ctx,hash); | |
731 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); | |
732 | EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); | |
733 | EVP_DigestUpdate(&md_ctx,md,md_size); | |
734 | EVP_DigestFinal_ex( &md_ctx,md,&md_size); | |
735 | ||
736 | EVP_MD_CTX_cleanup(&md_ctx); | |
737 | ||
738 | ssl3_record_sequence_update(seq); | |
739 | return(md_size); | |
740 | } | |
741 | ||
742 | void ssl3_record_sequence_update(unsigned char *seq) | |
743 | { | |
744 | int i; | |
745 | ||
746 | for (i=7; i>=0; i--) | |
747 | { | |
748 | ++seq[i]; | |
749 | if (seq[i] != 0) break; | |
750 | } | |
751 | } | |
752 | ||
753 | int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, | |
754 | int len) | |
755 | { | |
756 | static const unsigned char *salt[3]={ | |
757 | #ifndef CHARSET_EBCDIC | |
758 | (const unsigned char *)"A", | |
759 | (const unsigned char *)"BB", | |
760 | (const unsigned char *)"CCC", | |
761 | #else | |
762 | (const unsigned char *)"\x41", | |
763 | (const unsigned char *)"\x42\x42", | |
764 | (const unsigned char *)"\x43\x43\x43", | |
765 | #endif | |
766 | }; | |
767 | unsigned char buf[EVP_MAX_MD_SIZE]; | |
768 | EVP_MD_CTX ctx; | |
769 | int i,ret=0; | |
770 | unsigned int n; | |
771 | ||
772 | EVP_MD_CTX_init(&ctx); | |
773 | for (i=0; i<3; i++) | |
774 | { | |
775 | EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); | |
776 | EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); | |
777 | EVP_DigestUpdate(&ctx,p,len); | |
778 | EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), | |
779 | SSL3_RANDOM_SIZE); | |
780 | EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), | |
781 | SSL3_RANDOM_SIZE); | |
782 | EVP_DigestFinal_ex(&ctx,buf,&n); | |
783 | ||
784 | EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); | |
785 | EVP_DigestUpdate(&ctx,p,len); | |
786 | EVP_DigestUpdate(&ctx,buf,n); | |
787 | EVP_DigestFinal_ex(&ctx,out,&n); | |
788 | out+=n; | |
789 | ret+=n; | |
790 | } | |
791 | EVP_MD_CTX_cleanup(&ctx); | |
792 | return(ret); | |
793 | } | |
794 | ||
795 | int ssl3_alert_code(int code) | |
796 | { | |
797 | switch (code) | |
798 | { | |
799 | case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); | |
800 | case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); | |
801 | case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); | |
802 | case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); | |
803 | case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); | |
804 | case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); | |
805 | case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); | |
806 | case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); | |
807 | case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); | |
808 | case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); | |
809 | case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); | |
810 | case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); | |
811 | case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); | |
812 | case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); | |
813 | case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); | |
814 | case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); | |
815 | case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); | |
816 | case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); | |
817 | case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); | |
818 | case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); | |
819 | case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); | |
820 | case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); | |
821 | case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); | |
822 | case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ | |
823 | case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE); | |
824 | case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE); | |
825 | case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE); | |
826 | case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE); | |
827 | case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE); | |
828 | case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY); | |
829 | default: return(-1); | |
830 | } | |
831 | } | |
832 |