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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);
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,*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 		{
245 		if (s->enc_read_ctx != NULL)
246 			reuse_dd = 1;
247 		else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
248 			goto err;
249 		else
250 			/* make sure it's intialized in case we exit later with an error */
251 			EVP_CIPHER_CTX_init(s->enc_read_ctx);
252 		dd= s->enc_read_ctx;
253 
254 		ssl_replace_hash(&s->read_hash,m);
255 #ifndef OPENSSL_NO_COMP
256 		/* COMPRESS */
257 		if (s->expand != NULL)
258 			{
259 			COMP_CTX_free(s->expand);
260 			s->expand=NULL;
261 			}
262 		if (comp != NULL)
263 			{
264 			s->expand=COMP_CTX_new(comp);
265 			if (s->expand == NULL)
266 				{
267 				SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
268 				goto err2;
269 				}
270 			if (s->s3->rrec.comp == NULL)
271 				s->s3->rrec.comp=(unsigned char *)
272 					OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
273 			if (s->s3->rrec.comp == NULL)
274 				goto err;
275 			}
276 #endif
277 		memset(&(s->s3->read_sequence[0]),0,8);
278 		mac_secret= &(s->s3->read_mac_secret[0]);
279 		}
280 	else
281 		{
282 		if (s->enc_write_ctx != NULL)
283 			reuse_dd = 1;
284 		else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
285 			goto err;
286 		else
287 			/* make sure it's intialized in case we exit later with an error */
288 			EVP_CIPHER_CTX_init(s->enc_write_ctx);
289 		dd= s->enc_write_ctx;
290 		ssl_replace_hash(&s->write_hash,m);
291 #ifndef OPENSSL_NO_COMP
292 		/* COMPRESS */
293 		if (s->compress != NULL)
294 			{
295 			COMP_CTX_free(s->compress);
296 			s->compress=NULL;
297 			}
298 		if (comp != NULL)
299 			{
300 			s->compress=COMP_CTX_new(comp);
301 			if (s->compress == NULL)
302 				{
303 				SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
304 				goto err2;
305 				}
306 			}
307 #endif
308 		memset(&(s->s3->write_sequence[0]),0,8);
309 		mac_secret= &(s->s3->write_mac_secret[0]);
310 		}
311 
312 	if (reuse_dd)
313 		EVP_CIPHER_CTX_cleanup(dd);
314 
315 	p=s->s3->tmp.key_block;
316 	i=EVP_MD_size(m);
317 	if (i < 0)
318 		goto err2;
319 	cl=EVP_CIPHER_key_length(c);
320 	j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
321 		 cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
322 	/* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
323 	k=EVP_CIPHER_iv_length(c);
324 	if (	(which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
325 		(which == SSL3_CHANGE_CIPHER_SERVER_READ))
326 		{
327 		ms=  &(p[ 0]); n=i+i;
328 		key= &(p[ n]); n+=j+j;
329 		iv=  &(p[ n]); n+=k+k;
330 		er1= &(s->s3->client_random[0]);
331 		er2= &(s->s3->server_random[0]);
332 		}
333 	else
334 		{
335 		n=i;
336 		ms=  &(p[ n]); n+=i+j;
337 		key= &(p[ n]); n+=j+k;
338 		iv=  &(p[ n]); n+=k;
339 		er1= &(s->s3->server_random[0]);
340 		er2= &(s->s3->client_random[0]);
341 		}
342 
343 	if (n > s->s3->tmp.key_block_length)
344 		{
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
354 		 * same value 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 			{
365 			EVP_DigestInit_ex(&md,EVP_md5(), NULL);
366 			EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
367 			EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
368 			EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
369 			iv= &(exp_iv[0]);
370 			}
371 		}
372 
373 	s->session->key_arg_length=0;
374 
375 	EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
376 
377 	OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
378 	OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
379 	EVP_MD_CTX_cleanup(&md);
380 	return(1);
381 err:
382 	SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
383 err2:
384 	return(0);
385 	}
386 
ssl3_setup_key_block(SSL * s)387 int ssl3_setup_key_block(SSL *s)
388 	{
389 	unsigned char *p;
390 	const EVP_CIPHER *c;
391 	const EVP_MD *hash;
392 	int num;
393 	int ret = 0;
394 	SSL_COMP *comp;
395 
396 	if (s->s3->tmp.key_block_length != 0)
397 		return(1);
398 
399 	if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp))
400 		{
401 		SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
402 		return(0);
403 		}
404 
405 	s->s3->tmp.new_sym_enc=c;
406 	s->s3->tmp.new_hash=hash;
407 #ifdef OPENSSL_NO_COMP
408 	s->s3->tmp.new_compression=NULL;
409 #else
410 	s->s3->tmp.new_compression=comp;
411 #endif
412 
413 	num=EVP_MD_size(hash);
414 	if (num < 0)
415 		return 0;
416 
417 	num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c);
418 	num*=2;
419 
420 	ssl3_cleanup_key_block(s);
421 
422 	if ((p=OPENSSL_malloc(num)) == NULL)
423 		goto err;
424 
425 	s->s3->tmp.key_block_length=num;
426 	s->s3->tmp.key_block=p;
427 
428 	ret = ssl3_generate_key_block(s,p,num);
429 
430 	if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
431 		{
432 		/* enable vulnerability countermeasure for CBC ciphers with
433 		 * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
434 		 */
435 		s->s3->need_empty_fragments = 1;
436 
437 		if (s->session->cipher != NULL)
438 			{
439 			if (s->session->cipher->algorithm_enc == SSL_eNULL)
440 				s->s3->need_empty_fragments = 0;
441 
442 #ifndef OPENSSL_NO_RC4
443 			if (s->session->cipher->algorithm_enc == SSL_RC4)
444 				s->s3->need_empty_fragments = 0;
445 #endif
446 			}
447 		}
448 
449 	return ret;
450 
451 err:
452 	SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
453 	return(0);
454 	}
455 
ssl3_cleanup_key_block(SSL * s)456 void ssl3_cleanup_key_block(SSL *s)
457 	{
458 	if (s->s3->tmp.key_block != NULL)
459 		{
460 		OPENSSL_cleanse(s->s3->tmp.key_block,
461 			s->s3->tmp.key_block_length);
462 		OPENSSL_free(s->s3->tmp.key_block);
463 		s->s3->tmp.key_block=NULL;
464 		}
465 	s->s3->tmp.key_block_length=0;
466 	}
467 
ssl3_enc(SSL * s,int send)468 int ssl3_enc(SSL *s, int send)
469 	{
470 	SSL3_RECORD *rec;
471 	EVP_CIPHER_CTX *ds;
472 	unsigned long l;
473 	int bs,i;
474 	const EVP_CIPHER *enc;
475 
476 	if (send)
477 		{
478 		ds=s->enc_write_ctx;
479 		rec= &(s->s3->wrec);
480 		if (s->enc_write_ctx == NULL)
481 			enc=NULL;
482 		else
483 			enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
484 		}
485 	else
486 		{
487 		ds=s->enc_read_ctx;
488 		rec= &(s->s3->rrec);
489 		if (s->enc_read_ctx == NULL)
490 			enc=NULL;
491 		else
492 			enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
493 		}
494 
495 	if ((s->session == NULL) || (ds == NULL) ||
496 		(enc == NULL))
497 		{
498 		memmove(rec->data,rec->input,rec->length);
499 		rec->input=rec->data;
500 		}
501 	else
502 		{
503 		l=rec->length;
504 		bs=EVP_CIPHER_block_size(ds->cipher);
505 
506 		/* COMPRESS */
507 
508 		if ((bs != 1) && send)
509 			{
510 			i=bs-((int)l%bs);
511 
512 			/* we need to add 'i-1' padding bytes */
513 			l+=i;
514 			rec->length+=i;
515 			rec->input[l-1]=(i-1);
516 			}
517 
518 		if (!send)
519 			{
520 			if (l == 0 || l%bs != 0)
521 				{
522 				SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
523 				ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
524 				return 0;
525 				}
526 			/* otherwise, rec->length >= bs */
527 			}
528 
529 		EVP_Cipher(ds,rec->data,rec->input,l);
530 
531 		if ((bs != 1) && !send)
532 			{
533 			i=rec->data[l-1]+1;
534 			/* SSL 3.0 bounds the number of padding bytes by the block size;
535 			 * padding bytes (except the last one) are arbitrary */
536 			if (i > bs)
537 				{
538 				/* Incorrect padding. SSLerr() and ssl3_alert are done
539 				 * by caller: we don't want to reveal whether this is
540 				 * a decryption error or a MAC verification failure
541 				 * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
542 				return -1;
543 				}
544 			/* now i <= bs <= rec->length */
545 			rec->length-=i;
546 			}
547 		}
548 	return(1);
549 	}
550 
ssl3_init_finished_mac(SSL * s)551 void ssl3_init_finished_mac(SSL *s)
552 	{
553 	if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
554 	if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
555     s->s3->handshake_buffer=BIO_new(BIO_s_mem());
556 	(void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
557 	}
558 
ssl3_free_digest_list(SSL * s)559 void ssl3_free_digest_list(SSL *s)
560 	{
561 	int i;
562 	if (!s->s3->handshake_dgst) return;
563 	for (i=0;i<SSL_MAX_DIGEST;i++)
564 		{
565 		if (s->s3->handshake_dgst[i])
566 			EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
567 		}
568 	OPENSSL_free(s->s3->handshake_dgst);
569 	s->s3->handshake_dgst=NULL;
570 	}
571 
572 
573 
ssl3_finish_mac(SSL * s,const unsigned char * buf,int len)574 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
575 	{
576 	if (s->s3->handshake_buffer)
577 		{
578 		BIO_write (s->s3->handshake_buffer,(void *)buf,len);
579 		}
580 	else
581 		{
582 		int i;
583 		for (i=0;i< SSL_MAX_DIGEST;i++)
584 			{
585 			if (s->s3->handshake_dgst[i]!= NULL)
586 			EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
587 			}
588 		}
589 	}
590 
ssl3_digest_cached_records(SSL * s)591 int ssl3_digest_cached_records(SSL *s)
592 	{
593 	int i;
594 	long mask;
595 	const EVP_MD *md;
596 	long hdatalen;
597 	void *hdata;
598 
599 	/* Allocate handshake_dgst array */
600 	ssl3_free_digest_list(s);
601 	s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
602 	memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
603 	hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
604 	if (hdatalen <= 0)
605 		{
606 		SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
607 		return 0;
608 		}
609 
610 	/* Loop through bitso of algorithm2 field and create MD_CTX-es */
611 	for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++)
612 		{
613 		if ((mask & s->s3->tmp.new_cipher->algorithm2) && md)
614 			{
615 			s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
616 			EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
617 			EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
618 			}
619 		else
620 			{
621 			s->s3->handshake_dgst[i]=NULL;
622 			}
623 		}
624 	/* Free handshake_buffer BIO */
625 	BIO_free(s->s3->handshake_buffer);
626 	s->s3->handshake_buffer = NULL;
627 
628 	return 1;
629 	}
630 
ssl3_cert_verify_mac(SSL * s,int md_nid,unsigned char * p)631 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
632 	{
633 	return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
634 	}
ssl3_final_finish_mac(SSL * s,const char * sender,int len,unsigned char * p)635 int ssl3_final_finish_mac(SSL *s,
636 	     const char *sender, int len, unsigned char *p)
637 	{
638 	int ret;
639 	ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
640 	p+=ret;
641 	ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
642 	return(ret);
643 	}
ssl3_handshake_mac(SSL * s,int md_nid,const char * sender,int len,unsigned char * p)644 static int ssl3_handshake_mac(SSL *s, int md_nid,
645 	     const char *sender, int len, unsigned char *p)
646 	{
647 	unsigned int ret;
648 	int npad,n;
649 	unsigned int i;
650 	unsigned char md_buf[EVP_MAX_MD_SIZE];
651 	EVP_MD_CTX ctx,*d=NULL;
652 
653 	if (s->s3->handshake_buffer)
654 		if (!ssl3_digest_cached_records(s))
655 			return 0;
656 
657 	/* Search for digest of specified type in the handshake_dgst
658 	 * array*/
659 	for (i=0;i<SSL_MAX_DIGEST;i++)
660 		{
661 		  if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
662 		  	{
663 		  	d=s->s3->handshake_dgst[i];
664 			break;
665 			}
666 		}
667 	if (!d) {
668 		SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
669 		return 0;
670 	}
671 	EVP_MD_CTX_init(&ctx);
672 	EVP_MD_CTX_copy_ex(&ctx,d);
673 	n=EVP_MD_CTX_size(&ctx);
674 	if (n < 0)
675 		return 0;
676 
677 	npad=(48/n)*n;
678 	if (sender != NULL)
679 		EVP_DigestUpdate(&ctx,sender,len);
680 	EVP_DigestUpdate(&ctx,s->session->master_key,
681 		s->session->master_key_length);
682 	EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
683 	EVP_DigestFinal_ex(&ctx,md_buf,&i);
684 
685 	EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
686 	EVP_DigestUpdate(&ctx,s->session->master_key,
687 		s->session->master_key_length);
688 	EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
689 	EVP_DigestUpdate(&ctx,md_buf,i);
690 	EVP_DigestFinal_ex(&ctx,p,&ret);
691 
692 	EVP_MD_CTX_cleanup(&ctx);
693 
694 	return((int)ret);
695 	}
696 
n_ssl3_mac(SSL * ssl,unsigned char * md,int send)697 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
698 	{
699 	SSL3_RECORD *rec;
700 	unsigned char *mac_sec,*seq;
701 	EVP_MD_CTX md_ctx;
702 	const EVP_MD_CTX *hash;
703 	unsigned char *p,rec_char;
704 	unsigned int md_size;
705 	int npad;
706 	int t;
707 
708 	if (send)
709 		{
710 		rec= &(ssl->s3->wrec);
711 		mac_sec= &(ssl->s3->write_mac_secret[0]);
712 		seq= &(ssl->s3->write_sequence[0]);
713 		hash=ssl->write_hash;
714 		}
715 	else
716 		{
717 		rec= &(ssl->s3->rrec);
718 		mac_sec= &(ssl->s3->read_mac_secret[0]);
719 		seq= &(ssl->s3->read_sequence[0]);
720 		hash=ssl->read_hash;
721 		}
722 
723 	t=EVP_MD_CTX_size(hash);
724 	if (t < 0)
725 		return -1;
726 	md_size=t;
727 	npad=(48/md_size)*md_size;
728 
729 	/* Chop the digest off the end :-) */
730 	EVP_MD_CTX_init(&md_ctx);
731 
732 	EVP_MD_CTX_copy_ex( &md_ctx,hash);
733 	EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
734 	EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
735 	EVP_DigestUpdate(&md_ctx,seq,8);
736 	rec_char=rec->type;
737 	EVP_DigestUpdate(&md_ctx,&rec_char,1);
738 	p=md;
739 	s2n(rec->length,p);
740 	EVP_DigestUpdate(&md_ctx,md,2);
741 	EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
742 	EVP_DigestFinal_ex( &md_ctx,md,NULL);
743 
744 	EVP_MD_CTX_copy_ex( &md_ctx,hash);
745 	EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
746 	EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
747 	EVP_DigestUpdate(&md_ctx,md,md_size);
748 	EVP_DigestFinal_ex( &md_ctx,md,&md_size);
749 
750 	EVP_MD_CTX_cleanup(&md_ctx);
751 
752 	ssl3_record_sequence_update(seq);
753 	return(md_size);
754 	}
755 
ssl3_record_sequence_update(unsigned char * seq)756 void ssl3_record_sequence_update(unsigned char *seq)
757 	{
758 	int i;
759 
760 	for (i=7; i>=0; i--)
761 		{
762 		++seq[i];
763 		if (seq[i] != 0) break;
764 		}
765 	}
766 
ssl3_generate_master_secret(SSL * s,unsigned char * out,unsigned char * p,int len)767 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
768 	     int len)
769 	{
770 	static const unsigned char *salt[3]={
771 #ifndef CHARSET_EBCDIC
772 		(const unsigned char *)"A",
773 		(const unsigned char *)"BB",
774 		(const unsigned char *)"CCC",
775 #else
776 		(const unsigned char *)"\x41",
777 		(const unsigned char *)"\x42\x42",
778 		(const unsigned char *)"\x43\x43\x43",
779 #endif
780 		};
781 	unsigned char buf[EVP_MAX_MD_SIZE];
782 	EVP_MD_CTX ctx;
783 	int i,ret=0;
784 	unsigned int n;
785 
786 	EVP_MD_CTX_init(&ctx);
787 	for (i=0; i<3; i++)
788 		{
789 		EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
790 		EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
791 		EVP_DigestUpdate(&ctx,p,len);
792 		EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
793 			SSL3_RANDOM_SIZE);
794 		EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
795 			SSL3_RANDOM_SIZE);
796 		EVP_DigestFinal_ex(&ctx,buf,&n);
797 
798 		EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
799 		EVP_DigestUpdate(&ctx,p,len);
800 		EVP_DigestUpdate(&ctx,buf,n);
801 		EVP_DigestFinal_ex(&ctx,out,&n);
802 		out+=n;
803 		ret+=n;
804 		}
805 	EVP_MD_CTX_cleanup(&ctx);
806 	return(ret);
807 	}
808 
ssl3_alert_code(int code)809 int ssl3_alert_code(int code)
810 	{
811 	switch (code)
812 		{
813 	case SSL_AD_CLOSE_NOTIFY:	return(SSL3_AD_CLOSE_NOTIFY);
814 	case SSL_AD_UNEXPECTED_MESSAGE:	return(SSL3_AD_UNEXPECTED_MESSAGE);
815 	case SSL_AD_BAD_RECORD_MAC:	return(SSL3_AD_BAD_RECORD_MAC);
816 	case SSL_AD_DECRYPTION_FAILED:	return(SSL3_AD_BAD_RECORD_MAC);
817 	case SSL_AD_RECORD_OVERFLOW:	return(SSL3_AD_BAD_RECORD_MAC);
818 	case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
819 	case SSL_AD_HANDSHAKE_FAILURE:	return(SSL3_AD_HANDSHAKE_FAILURE);
820 	case SSL_AD_NO_CERTIFICATE:	return(SSL3_AD_NO_CERTIFICATE);
821 	case SSL_AD_BAD_CERTIFICATE:	return(SSL3_AD_BAD_CERTIFICATE);
822 	case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
823 	case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
824 	case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
825 	case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
826 	case SSL_AD_ILLEGAL_PARAMETER:	return(SSL3_AD_ILLEGAL_PARAMETER);
827 	case SSL_AD_UNKNOWN_CA:		return(SSL3_AD_BAD_CERTIFICATE);
828 	case SSL_AD_ACCESS_DENIED:	return(SSL3_AD_HANDSHAKE_FAILURE);
829 	case SSL_AD_DECODE_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);
830 	case SSL_AD_DECRYPT_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);
831 	case SSL_AD_EXPORT_RESTRICTION:	return(SSL3_AD_HANDSHAKE_FAILURE);
832 	case SSL_AD_PROTOCOL_VERSION:	return(SSL3_AD_HANDSHAKE_FAILURE);
833 	case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
834 	case SSL_AD_INTERNAL_ERROR:	return(SSL3_AD_HANDSHAKE_FAILURE);
835 	case SSL_AD_USER_CANCELLED:	return(SSL3_AD_HANDSHAKE_FAILURE);
836 	case SSL_AD_NO_RENEGOTIATION:	return(-1); /* Don't send it :-) */
837 	case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
838 	case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
839 	case SSL_AD_UNRECOGNIZED_NAME:	return(SSL3_AD_HANDSHAKE_FAILURE);
840 	case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
841 	case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
842 	case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
843 	default:			return(-1);
844 		}
845 	}
846 
847