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) 1998-2002 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 #include <stdio.h>
113 #include "ssl_locl.h"
114 #include <openssl/evp.h>
115 #include <openssl/md5.h>
116
117 static unsigned char ssl3_pad_1[48]={
118 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
119 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
120 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
121 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
122 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
123 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
124
125 static unsigned char ssl3_pad_2[48]={
126 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
127 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
128 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
129 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
130 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
131 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
132
133 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
134 const char *sender, int len, unsigned char *p);
135
ssl3_generate_key_block(SSL * s,unsigned char * km,int num)136 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
137 {
138 EVP_MD_CTX m5;
139 EVP_MD_CTX s1;
140 unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
141 unsigned char c='A';
142 unsigned int i,j,k;
143
144 #ifdef CHARSET_EBCDIC
145 c = os_toascii[c]; /*'A' in ASCII */
146 #endif
147 k=0;
148 EVP_MD_CTX_init(&m5);
149 EVP_MD_CTX_init(&s1);
150 for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
151 {
152 k++;
153 if (k > sizeof buf)
154 {
155 /* bug: 'buf' is too small for this ciphersuite */
156 SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
157 return 0;
158 }
159
160 for (j=0; j<k; j++)
161 buf[j]=c;
162 c++;
163 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
164 EVP_DigestUpdate(&s1,buf,k);
165 EVP_DigestUpdate(&s1,s->session->master_key,
166 s->session->master_key_length);
167 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
168 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
169 EVP_DigestFinal_ex(&s1,smd,NULL);
170
171 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
172 EVP_DigestUpdate(&m5,s->session->master_key,
173 s->session->master_key_length);
174 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
175 if ((int)(i+MD5_DIGEST_LENGTH) > num)
176 {
177 EVP_DigestFinal_ex(&m5,smd,NULL);
178 memcpy(km,smd,(num-i));
179 }
180 else
181 EVP_DigestFinal_ex(&m5,km,NULL);
182
183 km+=MD5_DIGEST_LENGTH;
184 }
185 OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
186 EVP_MD_CTX_cleanup(&m5);
187 EVP_MD_CTX_cleanup(&s1);
188 return 1;
189 }
190
ssl3_change_cipher_state(SSL * s,int which)191 int ssl3_change_cipher_state(SSL *s, int which)
192 {
193 unsigned char *p,*key_block,*mac_secret;
194 unsigned char exp_key[EVP_MAX_KEY_LENGTH];
195 unsigned char exp_iv[EVP_MAX_IV_LENGTH];
196 unsigned char *ms,*key,*iv,*er1,*er2;
197 EVP_CIPHER_CTX *dd;
198 const EVP_CIPHER *c;
199 #ifndef OPENSSL_NO_COMP
200 COMP_METHOD *comp;
201 #endif
202 const EVP_MD *m;
203 EVP_MD_CTX md;
204 int is_exp,n,i,j,k,cl;
205 int reuse_dd = 0;
206
207 is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
208 c=s->s3->tmp.new_sym_enc;
209 m=s->s3->tmp.new_hash;
210 #ifndef OPENSSL_NO_COMP
211 if (s->s3->tmp.new_compression == NULL)
212 comp=NULL;
213 else
214 comp=s->s3->tmp.new_compression->method;
215 #endif
216 key_block=s->s3->tmp.key_block;
217
218 if (which & SSL3_CC_READ)
219 {
220 if (s->enc_read_ctx != NULL)
221 reuse_dd = 1;
222 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
223 goto err;
224 else
225 /* make sure it's intialized in case we exit later with an error */
226 EVP_CIPHER_CTX_init(s->enc_read_ctx);
227 dd= s->enc_read_ctx;
228 s->read_hash=m;
229 #ifndef OPENSSL_NO_COMP
230 /* COMPRESS */
231 if (s->expand != NULL)
232 {
233 COMP_CTX_free(s->expand);
234 s->expand=NULL;
235 }
236 if (comp != NULL)
237 {
238 s->expand=COMP_CTX_new(comp);
239 if (s->expand == NULL)
240 {
241 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
242 goto err2;
243 }
244 if (s->s3->rrec.comp == NULL)
245 s->s3->rrec.comp=(unsigned char *)
246 OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
247 if (s->s3->rrec.comp == NULL)
248 goto err;
249 }
250 #endif
251 memset(&(s->s3->read_sequence[0]),0,8);
252 mac_secret= &(s->s3->read_mac_secret[0]);
253 }
254 else
255 {
256 if (s->enc_write_ctx != NULL)
257 reuse_dd = 1;
258 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
259 goto err;
260 else
261 /* make sure it's intialized in case we exit later with an error */
262 EVP_CIPHER_CTX_init(s->enc_write_ctx);
263 dd= s->enc_write_ctx;
264 s->write_hash=m;
265 #ifndef OPENSSL_NO_COMP
266 /* COMPRESS */
267 if (s->compress != NULL)
268 {
269 COMP_CTX_free(s->compress);
270 s->compress=NULL;
271 }
272 if (comp != NULL)
273 {
274 s->compress=COMP_CTX_new(comp);
275 if (s->compress == NULL)
276 {
277 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
278 goto err2;
279 }
280 }
281 #endif
282 memset(&(s->s3->write_sequence[0]),0,8);
283 mac_secret= &(s->s3->write_mac_secret[0]);
284 }
285
286 if (reuse_dd)
287 EVP_CIPHER_CTX_cleanup(dd);
288
289 p=s->s3->tmp.key_block;
290 i=EVP_MD_size(m);
291 cl=EVP_CIPHER_key_length(c);
292 j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
293 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
294 /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
295 k=EVP_CIPHER_iv_length(c);
296 if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
297 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
298 {
299 ms= &(p[ 0]); n=i+i;
300 key= &(p[ n]); n+=j+j;
301 iv= &(p[ n]); n+=k+k;
302 er1= &(s->s3->client_random[0]);
303 er2= &(s->s3->server_random[0]);
304 }
305 else
306 {
307 n=i;
308 ms= &(p[ n]); n+=i+j;
309 key= &(p[ n]); n+=j+k;
310 iv= &(p[ n]); n+=k;
311 er1= &(s->s3->server_random[0]);
312 er2= &(s->s3->client_random[0]);
313 }
314
315 if (n > s->s3->tmp.key_block_length)
316 {
317 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
318 goto err2;
319 }
320
321 EVP_MD_CTX_init(&md);
322 memcpy(mac_secret,ms,i);
323 if (is_exp)
324 {
325 /* In here I set both the read and write key/iv to the
326 * same value since only the correct one will be used :-).
327 */
328 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
329 EVP_DigestUpdate(&md,key,j);
330 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
331 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
332 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
333 key= &(exp_key[0]);
334
335 if (k > 0)
336 {
337 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
338 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
339 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
340 EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
341 iv= &(exp_iv[0]);
342 }
343 }
344
345 s->session->key_arg_length=0;
346
347 EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
348
349 OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
350 OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
351 EVP_MD_CTX_cleanup(&md);
352 return(1);
353 err:
354 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
355 err2:
356 return(0);
357 }
358
ssl3_setup_key_block(SSL * s)359 int ssl3_setup_key_block(SSL *s)
360 {
361 unsigned char *p;
362 const EVP_CIPHER *c;
363 const EVP_MD *hash;
364 int num;
365 int ret = 0;
366 SSL_COMP *comp;
367
368 if (s->s3->tmp.key_block_length != 0)
369 return(1);
370
371 if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
372 {
373 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
374 return(0);
375 }
376
377 s->s3->tmp.new_sym_enc=c;
378 s->s3->tmp.new_hash=hash;
379 #ifdef OPENSSL_NO_COMP
380 s->s3->tmp.new_compression=NULL;
381 #else
382 s->s3->tmp.new_compression=comp;
383 #endif
384
385 num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
386 num*=2;
387
388 ssl3_cleanup_key_block(s);
389
390 if ((p=OPENSSL_malloc(num)) == NULL)
391 goto err;
392
393 s->s3->tmp.key_block_length=num;
394 s->s3->tmp.key_block=p;
395
396 ret = ssl3_generate_key_block(s,p,num);
397
398 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
399 {
400 /* enable vulnerability countermeasure for CBC ciphers with
401 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
402 */
403 s->s3->need_empty_fragments = 1;
404
405 if (s->session->cipher != NULL)
406 {
407 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
408 s->s3->need_empty_fragments = 0;
409
410 #ifndef OPENSSL_NO_RC4
411 if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
412 s->s3->need_empty_fragments = 0;
413 #endif
414 }
415 }
416
417 return ret;
418
419 err:
420 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
421 return(0);
422 }
423
ssl3_cleanup_key_block(SSL * s)424 void ssl3_cleanup_key_block(SSL *s)
425 {
426 if (s->s3->tmp.key_block != NULL)
427 {
428 OPENSSL_cleanse(s->s3->tmp.key_block,
429 s->s3->tmp.key_block_length);
430 OPENSSL_free(s->s3->tmp.key_block);
431 s->s3->tmp.key_block=NULL;
432 }
433 s->s3->tmp.key_block_length=0;
434 }
435
ssl3_enc(SSL * s,int send)436 int ssl3_enc(SSL *s, int send)
437 {
438 SSL3_RECORD *rec;
439 EVP_CIPHER_CTX *ds;
440 unsigned long l;
441 int bs,i;
442 const EVP_CIPHER *enc;
443
444 if (send)
445 {
446 ds=s->enc_write_ctx;
447 rec= &(s->s3->wrec);
448 if (s->enc_write_ctx == NULL)
449 enc=NULL;
450 else
451 enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
452 }
453 else
454 {
455 ds=s->enc_read_ctx;
456 rec= &(s->s3->rrec);
457 if (s->enc_read_ctx == NULL)
458 enc=NULL;
459 else
460 enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
461 }
462
463 if ((s->session == NULL) || (ds == NULL) ||
464 (enc == NULL))
465 {
466 memmove(rec->data,rec->input,rec->length);
467 rec->input=rec->data;
468 }
469 else
470 {
471 l=rec->length;
472 bs=EVP_CIPHER_block_size(ds->cipher);
473
474 /* COMPRESS */
475
476 if ((bs != 1) && send)
477 {
478 i=bs-((int)l%bs);
479
480 /* we need to add 'i-1' padding bytes */
481 l+=i;
482 rec->length+=i;
483 rec->input[l-1]=(i-1);
484 }
485
486 if (!send)
487 {
488 if (l == 0 || l%bs != 0)
489 {
490 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
491 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
492 return 0;
493 }
494 /* otherwise, rec->length >= bs */
495 }
496
497 EVP_Cipher(ds,rec->data,rec->input,l);
498
499 if ((bs != 1) && !send)
500 {
501 i=rec->data[l-1]+1;
502 /* SSL 3.0 bounds the number of padding bytes by the block size;
503 * padding bytes (except the last one) are arbitrary */
504 if (i > bs)
505 {
506 /* Incorrect padding. SSLerr() and ssl3_alert are done
507 * by caller: we don't want to reveal whether this is
508 * a decryption error or a MAC verification failure
509 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
510 return -1;
511 }
512 /* now i <= bs <= rec->length */
513 rec->length-=i;
514 }
515 }
516 return(1);
517 }
518
ssl3_init_finished_mac(SSL * s)519 void ssl3_init_finished_mac(SSL *s)
520 {
521 EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);
522 EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);
523 }
524
ssl3_finish_mac(SSL * s,const unsigned char * buf,int len)525 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
526 {
527 EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
528 EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
529 }
530
ssl3_cert_verify_mac(SSL * s,EVP_MD_CTX * ctx,unsigned char * p)531 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
532 {
533 return(ssl3_handshake_mac(s,ctx,NULL,0,p));
534 }
535
ssl3_final_finish_mac(SSL * s,EVP_MD_CTX * ctx1,EVP_MD_CTX * ctx2,const char * sender,int len,unsigned char * p)536 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
537 const char *sender, int len, unsigned char *p)
538 {
539 int ret;
540
541 ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
542 p+=ret;
543 ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
544 return(ret);
545 }
546
ssl3_handshake_mac(SSL * s,EVP_MD_CTX * in_ctx,const char * sender,int len,unsigned char * p)547 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
548 const char *sender, int len, unsigned char *p)
549 {
550 unsigned int ret;
551 int npad,n;
552 unsigned int i;
553 unsigned char md_buf[EVP_MAX_MD_SIZE];
554 EVP_MD_CTX ctx;
555
556 EVP_MD_CTX_init(&ctx);
557 EVP_MD_CTX_copy_ex(&ctx,in_ctx);
558
559 n=EVP_MD_CTX_size(&ctx);
560 npad=(48/n)*n;
561
562 if (sender != NULL)
563 EVP_DigestUpdate(&ctx,sender,len);
564 EVP_DigestUpdate(&ctx,s->session->master_key,
565 s->session->master_key_length);
566 EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
567 EVP_DigestFinal_ex(&ctx,md_buf,&i);
568
569 EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
570 EVP_DigestUpdate(&ctx,s->session->master_key,
571 s->session->master_key_length);
572 EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
573 EVP_DigestUpdate(&ctx,md_buf,i);
574 EVP_DigestFinal_ex(&ctx,p,&ret);
575
576 EVP_MD_CTX_cleanup(&ctx);
577
578 return((int)ret);
579 }
580
ssl3_mac(SSL * ssl,unsigned char * md,int send)581 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
582 {
583 SSL3_RECORD *rec;
584 unsigned char *mac_sec,*seq;
585 EVP_MD_CTX md_ctx;
586 const EVP_MD *hash;
587 unsigned char *p,rec_char;
588 unsigned int md_size;
589 int npad;
590
591 if (send)
592 {
593 rec= &(ssl->s3->wrec);
594 mac_sec= &(ssl->s3->write_mac_secret[0]);
595 seq= &(ssl->s3->write_sequence[0]);
596 hash=ssl->write_hash;
597 }
598 else
599 {
600 rec= &(ssl->s3->rrec);
601 mac_sec= &(ssl->s3->read_mac_secret[0]);
602 seq= &(ssl->s3->read_sequence[0]);
603 hash=ssl->read_hash;
604 }
605
606 md_size=EVP_MD_size(hash);
607 npad=(48/md_size)*md_size;
608
609 /* Chop the digest off the end :-) */
610 EVP_MD_CTX_init(&md_ctx);
611
612 EVP_DigestInit_ex( &md_ctx,hash, NULL);
613 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
614 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
615 EVP_DigestUpdate(&md_ctx,seq,8);
616 rec_char=rec->type;
617 EVP_DigestUpdate(&md_ctx,&rec_char,1);
618 p=md;
619 s2n(rec->length,p);
620 EVP_DigestUpdate(&md_ctx,md,2);
621 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
622 EVP_DigestFinal_ex( &md_ctx,md,NULL);
623
624 EVP_DigestInit_ex( &md_ctx,hash, NULL);
625 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
626 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
627 EVP_DigestUpdate(&md_ctx,md,md_size);
628 EVP_DigestFinal_ex( &md_ctx,md,&md_size);
629
630 EVP_MD_CTX_cleanup(&md_ctx);
631
632 ssl3_record_sequence_update(seq);
633 return(md_size);
634 }
635
ssl3_record_sequence_update(unsigned char * seq)636 void ssl3_record_sequence_update(unsigned char *seq)
637 {
638 int i;
639
640 for (i=7; i>=0; i--)
641 {
642 ++seq[i];
643 if (seq[i] != 0) break;
644 }
645 }
646
ssl3_generate_master_secret(SSL * s,unsigned char * out,unsigned char * p,int len)647 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
648 int len)
649 {
650 static const unsigned char *salt[3]={
651 #ifndef CHARSET_EBCDIC
652 (const unsigned char *)"A",
653 (const unsigned char *)"BB",
654 (const unsigned char *)"CCC",
655 #else
656 (const unsigned char *)"\x41",
657 (const unsigned char *)"\x42\x42",
658 (const unsigned char *)"\x43\x43\x43",
659 #endif
660 };
661 unsigned char buf[EVP_MAX_MD_SIZE];
662 EVP_MD_CTX ctx;
663 int i,ret=0;
664 unsigned int n;
665
666 EVP_MD_CTX_init(&ctx);
667 for (i=0; i<3; i++)
668 {
669 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
670 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
671 EVP_DigestUpdate(&ctx,p,len);
672 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
673 SSL3_RANDOM_SIZE);
674 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
675 SSL3_RANDOM_SIZE);
676 EVP_DigestFinal_ex(&ctx,buf,&n);
677
678 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
679 EVP_DigestUpdate(&ctx,p,len);
680 EVP_DigestUpdate(&ctx,buf,n);
681 EVP_DigestFinal_ex(&ctx,out,&n);
682 out+=n;
683 ret+=n;
684 }
685 EVP_MD_CTX_cleanup(&ctx);
686 return(ret);
687 }
688
ssl3_alert_code(int code)689 int ssl3_alert_code(int code)
690 {
691 switch (code)
692 {
693 case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
694 case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
695 case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
696 case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
697 case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
698 case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
699 case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
700 case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
701 case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
702 case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
703 case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
704 case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
705 case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
706 case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
707 case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
708 case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
709 case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
710 case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
711 case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
712 case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
713 case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
714 case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
715 case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE);
716 case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */
717 default: return(-1);
718 }
719 }
720
721