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);
ssl3_generate_key_block(SSL * s,unsigned char * km,int num)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
ssl3_change_cipher_state(SSL * s,int which)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 /* 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 key_block=s->s3->tmp.key_block;
243
244 if (which & SSL3_CC_READ)
245 {
246 if (s->enc_read_ctx != NULL)
247 reuse_dd = 1;
248 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
249 goto err;
250 else
251 /* make sure it's intialized in case we exit later with an error */
252 EVP_CIPHER_CTX_init(s->enc_read_ctx);
253 dd= s->enc_read_ctx;
254
255 ssl_replace_hash(&s->read_hash,m);
256 #ifndef OPENSSL_NO_COMP
257 /* COMPRESS */
258 if (s->expand != NULL)
259 {
260 COMP_CTX_free(s->expand);
261 s->expand=NULL;
262 }
263 if (comp != NULL)
264 {
265 s->expand=COMP_CTX_new(comp);
266 if (s->expand == NULL)
267 {
268 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
269 goto err2;
270 }
271 if (s->s3->rrec.comp == NULL)
272 s->s3->rrec.comp=(unsigned char *)
273 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
274 if (s->s3->rrec.comp == NULL)
275 goto err;
276 }
277 #endif
278 memset(&(s->s3->read_sequence[0]),0,8);
279 mac_secret= &(s->s3->read_mac_secret[0]);
280 }
281 else
282 {
283 if (s->enc_write_ctx != NULL)
284 reuse_dd = 1;
285 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
286 goto err;
287 else
288 /* make sure it's intialized in case we exit later with an error */
289 EVP_CIPHER_CTX_init(s->enc_write_ctx);
290 dd= s->enc_write_ctx;
291 ssl_replace_hash(&s->write_hash,m);
292 #ifndef OPENSSL_NO_COMP
293 /* COMPRESS */
294 if (s->compress != NULL)
295 {
296 COMP_CTX_free(s->compress);
297 s->compress=NULL;
298 }
299 if (comp != NULL)
300 {
301 s->compress=COMP_CTX_new(comp);
302 if (s->compress == NULL)
303 {
304 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
305 goto err2;
306 }
307 }
308 #endif
309 memset(&(s->s3->write_sequence[0]),0,8);
310 mac_secret= &(s->s3->write_mac_secret[0]);
311 }
312
313 if (reuse_dd)
314 EVP_CIPHER_CTX_cleanup(dd);
315
316 p=s->s3->tmp.key_block;
317 i=EVP_MD_size(m);
318 if (i < 0)
319 goto err2;
320 cl=EVP_CIPHER_key_length(c);
321 j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
322 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
323 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
324 k=EVP_CIPHER_iv_length(c);
325 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
326 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
327 {
328 ms= &(p[ 0]); n=i+i;
329 key= &(p[ n]); n+=j+j;
330 iv= &(p[ n]); n+=k+k;
331 er1= &(s->s3->client_random[0]);
332 er2= &(s->s3->server_random[0]);
333 }
334 else
335 {
336 n=i;
337 ms= &(p[ n]); n+=i+j;
338 key= &(p[ n]); n+=j+k;
339 iv= &(p[ n]); 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 {
346 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
347 goto err2;
348 }
349
350 EVP_MD_CTX_init(&md);
351 memcpy(mac_secret,ms,i);
352 if (is_exp)
353 {
354 /* In here I set both the read and write key/iv to the
355 * same value since only the correct one will be used :-).
356 */
357 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
358 EVP_DigestUpdate(&md,key,j);
359 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
360 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
361 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
362 key= &(exp_key[0]);
363
364 if (k > 0)
365 {
366 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
367 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
368 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
369 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
370 iv= &(exp_iv[0]);
371 }
372 }
373
374 s->session->key_arg_length=0;
375
376 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
377
378 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
379 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
380 EVP_MD_CTX_cleanup(&md);
381 return(1);
382 err:
383 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
384 err2:
385 return(0);
386 }
387
ssl3_setup_key_block(SSL * s)388 int ssl3_setup_key_block(SSL *s)
389 {
390 unsigned char *p;
391 const EVP_CIPHER *c;
392 const EVP_MD *hash;
393 int num;
394 int ret = 0;
395 SSL_COMP *comp;
396
397 if (s->s3->tmp.key_block_length != 0)
398 return(1);
399
400 if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp))
401 {
402 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
403 return(0);
404 }
405
406 s->s3->tmp.new_sym_enc=c;
407 s->s3->tmp.new_hash=hash;
408 #ifdef OPENSSL_NO_COMP
409 s->s3->tmp.new_compression=NULL;
410 #else
411 s->s3->tmp.new_compression=comp;
412 #endif
413
414 num=EVP_MD_size(hash);
415 if (num < 0)
416 return 0;
417
418 num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c);
419 num*=2;
420
421 ssl3_cleanup_key_block(s);
422
423 if ((p=OPENSSL_malloc(num)) == NULL)
424 goto err;
425
426 s->s3->tmp.key_block_length=num;
427 s->s3->tmp.key_block=p;
428
429 ret = ssl3_generate_key_block(s,p,num);
430
431 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
432 {
433 /* enable vulnerability countermeasure for CBC ciphers with
434 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
435 */
436 s->s3->need_empty_fragments = 1;
437
438 if (s->session->cipher != NULL)
439 {
440 if (s->session->cipher->algorithm_enc == SSL_eNULL)
441 s->s3->need_empty_fragments = 0;
442
443 #ifndef OPENSSL_NO_RC4
444 if (s->session->cipher->algorithm_enc == SSL_RC4)
445 s->s3->need_empty_fragments = 0;
446 #endif
447 }
448 }
449
450 return ret;
451
452 err:
453 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
454 return(0);
455 }
456
ssl3_cleanup_key_block(SSL * s)457 void ssl3_cleanup_key_block(SSL *s)
458 {
459 if (s->s3->tmp.key_block != NULL)
460 {
461 OPENSSL_cleanse(s->s3->tmp.key_block,
462 s->s3->tmp.key_block_length);
463 OPENSSL_free(s->s3->tmp.key_block);
464 s->s3->tmp.key_block=NULL;
465 }
466 s->s3->tmp.key_block_length=0;
467 }
468
ssl3_enc(SSL * s,int send)469 int ssl3_enc(SSL *s, int send)
470 {
471 SSL3_RECORD *rec;
472 EVP_CIPHER_CTX *ds;
473 unsigned long l;
474 int bs,i;
475 const EVP_CIPHER *enc;
476
477 if (send)
478 {
479 ds=s->enc_write_ctx;
480 rec= &(s->s3->wrec);
481 if (s->enc_write_ctx == NULL)
482 enc=NULL;
483 else
484 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
485 }
486 else
487 {
488 ds=s->enc_read_ctx;
489 rec= &(s->s3->rrec);
490 if (s->enc_read_ctx == NULL)
491 enc=NULL;
492 else
493 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
494 }
495
496 if ((s->session == NULL) || (ds == NULL) ||
497 (enc == NULL))
498 {
499 memmove(rec->data,rec->input,rec->length);
500 rec->input=rec->data;
501 }
502 else
503 {
504 l=rec->length;
505 bs=EVP_CIPHER_block_size(ds->cipher);
506
507 /* COMPRESS */
508
509 if ((bs != 1) && send)
510 {
511 i=bs-((int)l%bs);
512
513 /* we need to add 'i-1' padding bytes */
514 l+=i;
515 rec->length+=i;
516 rec->input[l-1]=(i-1);
517 }
518
519 if (!send)
520 {
521 if (l == 0 || l%bs != 0)
522 {
523 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
524 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
525 return 0;
526 }
527 /* otherwise, rec->length >= bs */
528 }
529
530 EVP_Cipher(ds,rec->data,rec->input,l);
531
532 if ((bs != 1) && !send)
533 {
534 i=rec->data[l-1]+1;
535 /* SSL 3.0 bounds the number of padding bytes by the block size;
536 * padding bytes (except the last one) are arbitrary */
537 if (i > bs)
538 {
539 /* Incorrect padding. SSLerr() and ssl3_alert are done
540 * by caller: we don't want to reveal whether this is
541 * a decryption error or a MAC verification failure
542 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
543 return -1;
544 }
545 /* now i <= bs <= rec->length */
546 rec->length-=i;
547 }
548 }
549 return(1);
550 }
551
ssl3_init_finished_mac(SSL * s)552 void ssl3_init_finished_mac(SSL *s)
553 {
554 if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
555 if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
556 s->s3->handshake_buffer=BIO_new(BIO_s_mem());
557 (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
558 }
559
ssl3_free_digest_list(SSL * s)560 void ssl3_free_digest_list(SSL *s)
561 {
562 int i;
563 if (!s->s3->handshake_dgst) return;
564 for (i=0;i<SSL_MAX_DIGEST;i++)
565 {
566 if (s->s3->handshake_dgst[i])
567 EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
568 }
569 OPENSSL_free(s->s3->handshake_dgst);
570 s->s3->handshake_dgst=NULL;
571 }
572
573
574
ssl3_finish_mac(SSL * s,const unsigned char * buf,int len)575 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
576 {
577 if (s->s3->handshake_buffer)
578 {
579 BIO_write (s->s3->handshake_buffer,(void *)buf,len);
580 }
581 else
582 {
583 int i;
584 for (i=0;i< SSL_MAX_DIGEST;i++)
585 {
586 if (s->s3->handshake_dgst[i]!= NULL)
587 EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
588 }
589 }
590 }
591
ssl3_digest_cached_records(SSL * s)592 int ssl3_digest_cached_records(SSL *s)
593 {
594 int i;
595 long mask;
596 const EVP_MD *md;
597 long hdatalen;
598 void *hdata;
599
600 /* Allocate handshake_dgst array */
601 ssl3_free_digest_list(s);
602 s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
603 memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
604 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
605 if (hdatalen <= 0)
606 {
607 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
608 return 0;
609 }
610
611 /* Loop through bitso of algorithm2 field and create MD_CTX-es */
612 for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++)
613 {
614 if ((mask & s->s3->tmp.new_cipher->algorithm2) && md)
615 {
616 s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
617 EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
618 EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
619 }
620 else
621 {
622 s->s3->handshake_dgst[i]=NULL;
623 }
624 }
625 /* Free handshake_buffer BIO */
626 BIO_free(s->s3->handshake_buffer);
627 s->s3->handshake_buffer = NULL;
628
629 return 1;
630 }
631
ssl3_cert_verify_mac(SSL * s,int md_nid,unsigned char * p)632 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
633 {
634 return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
635 }
ssl3_final_finish_mac(SSL * s,const char * sender,int len,unsigned char * p)636 int ssl3_final_finish_mac(SSL *s,
637 const char *sender, int len, unsigned char *p)
638 {
639 int ret;
640 ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
641 p+=ret;
642 ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
643 return(ret);
644 }
ssl3_handshake_mac(SSL * s,int md_nid,const char * sender,int len,unsigned char * p)645 static int ssl3_handshake_mac(SSL *s, int md_nid,
646 const char *sender, int len, unsigned char *p)
647 {
648 unsigned int ret;
649 int npad,n;
650 unsigned int i;
651 unsigned char md_buf[EVP_MAX_MD_SIZE];
652 EVP_MD_CTX ctx,*d=NULL;
653
654 if (s->s3->handshake_buffer)
655 if (!ssl3_digest_cached_records(s))
656 return 0;
657
658 /* Search for digest of specified type in the handshake_dgst
659 * array*/
660 for (i=0;i<SSL_MAX_DIGEST;i++)
661 {
662 if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
663 {
664 d=s->s3->handshake_dgst[i];
665 break;
666 }
667 }
668 if (!d) {
669 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
670 return 0;
671 }
672 EVP_MD_CTX_init(&ctx);
673 EVP_MD_CTX_copy_ex(&ctx,d);
674 n=EVP_MD_CTX_size(&ctx);
675 if (n < 0)
676 return 0;
677
678 npad=(48/n)*n;
679 if (sender != NULL)
680 EVP_DigestUpdate(&ctx,sender,len);
681 EVP_DigestUpdate(&ctx,s->session->master_key,
682 s->session->master_key_length);
683 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
684 EVP_DigestFinal_ex(&ctx,md_buf,&i);
685
686 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
687 EVP_DigestUpdate(&ctx,s->session->master_key,
688 s->session->master_key_length);
689 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
690 EVP_DigestUpdate(&ctx,md_buf,i);
691 EVP_DigestFinal_ex(&ctx,p,&ret);
692
693 EVP_MD_CTX_cleanup(&ctx);
694
695 return((int)ret);
696 }
697
n_ssl3_mac(SSL * ssl,unsigned char * md,int send)698 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
699 {
700 SSL3_RECORD *rec;
701 unsigned char *mac_sec,*seq;
702 EVP_MD_CTX md_ctx;
703 const EVP_MD_CTX *hash;
704 unsigned char *p,rec_char;
705 unsigned int md_size;
706 int npad;
707 int t;
708
709 if (send)
710 {
711 rec= &(ssl->s3->wrec);
712 mac_sec= &(ssl->s3->write_mac_secret[0]);
713 seq= &(ssl->s3->write_sequence[0]);
714 hash=ssl->write_hash;
715 }
716 else
717 {
718 rec= &(ssl->s3->rrec);
719 mac_sec= &(ssl->s3->read_mac_secret[0]);
720 seq= &(ssl->s3->read_sequence[0]);
721 hash=ssl->read_hash;
722 }
723
724 t=EVP_MD_CTX_size(hash);
725 if (t < 0)
726 return -1;
727 md_size=t;
728 npad=(48/md_size)*md_size;
729
730 /* Chop the digest off the end :-) */
731 EVP_MD_CTX_init(&md_ctx);
732
733 EVP_MD_CTX_copy_ex( &md_ctx,hash);
734 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
735 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
736 EVP_DigestUpdate(&md_ctx,seq,8);
737 rec_char=rec->type;
738 EVP_DigestUpdate(&md_ctx,&rec_char,1);
739 p=md;
740 s2n(rec->length,p);
741 EVP_DigestUpdate(&md_ctx,md,2);
742 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
743 EVP_DigestFinal_ex( &md_ctx,md,NULL);
744
745 EVP_MD_CTX_copy_ex( &md_ctx,hash);
746 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
747 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
748 EVP_DigestUpdate(&md_ctx,md,md_size);
749 EVP_DigestFinal_ex( &md_ctx,md,&md_size);
750
751 EVP_MD_CTX_cleanup(&md_ctx);
752
753 ssl3_record_sequence_update(seq);
754 return(md_size);
755 }
756
ssl3_record_sequence_update(unsigned char * seq)757 void ssl3_record_sequence_update(unsigned char *seq)
758 {
759 int i;
760
761 for (i=7; i>=0; i--)
762 {
763 ++seq[i];
764 if (seq[i] != 0) break;
765 }
766 }
767
ssl3_generate_master_secret(SSL * s,unsigned char * out,unsigned char * p,int len)768 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
769 int len)
770 {
771 static const unsigned char *salt[3]={
772 #ifndef CHARSET_EBCDIC
773 (const unsigned char *)"A",
774 (const unsigned char *)"BB",
775 (const unsigned char *)"CCC",
776 #else
777 (const unsigned char *)"\x41",
778 (const unsigned char *)"\x42\x42",
779 (const unsigned char *)"\x43\x43\x43",
780 #endif
781 };
782 unsigned char buf[EVP_MAX_MD_SIZE];
783 EVP_MD_CTX ctx;
784 int i,ret=0;
785 unsigned int n;
786
787 EVP_MD_CTX_init(&ctx);
788 for (i=0; i<3; i++)
789 {
790 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
791 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
792 EVP_DigestUpdate(&ctx,p,len);
793 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
794 SSL3_RANDOM_SIZE);
795 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
796 SSL3_RANDOM_SIZE);
797 EVP_DigestFinal_ex(&ctx,buf,&n);
798
799 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
800 EVP_DigestUpdate(&ctx,p,len);
801 EVP_DigestUpdate(&ctx,buf,n);
802 EVP_DigestFinal_ex(&ctx,out,&n);
803 out+=n;
804 ret+=n;
805 }
806 EVP_MD_CTX_cleanup(&ctx);
807 return(ret);
808 }
809
ssl3_alert_code(int code)810 int ssl3_alert_code(int code)
811 {
812 switch (code)
813 {
814 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
815 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
816 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
817 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
818 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
819 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
820 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
821 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
822 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
823 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
824 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
825 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
826 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
827 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
828 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
829 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
830 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
831 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
832 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
833 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
834 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
835 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
836 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE);
837 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */
838 case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
839 case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
840 case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE);
841 case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
842 case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
843 case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
844 default: return(-1);
845 }
846 }
847
848