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s3_enc.c
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1 /* ssl/s3_enc.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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  * [email protected].
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  * ([email protected]). This product includes software written by Tim
108  * Hudson ([email protected]).
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_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
174  EVP_MD_CTX_init(&s1);
175  for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
176  {
177  k++;
178  if (k > sizeof buf)
179  {
180  /* bug: 'buf' is too small for this ciphersuite */
181  SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
182  return 0;
183  }
184 
185  for (j=0; j<k; j++)
186  buf[j]=c;
187  c++;
188  EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
189  EVP_DigestUpdate(&s1,buf,k);
190  EVP_DigestUpdate(&s1,s->session->master_key,
191  s->session->master_key_length);
192  EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
193  EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
194  EVP_DigestFinal_ex(&s1,smd,NULL);
195 
196  EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
197  EVP_DigestUpdate(&m5,s->session->master_key,
198  s->session->master_key_length);
199  EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
200  if ((int)(i+MD5_DIGEST_LENGTH) > num)
201  {
202  EVP_DigestFinal_ex(&m5,smd,NULL);
203  memcpy(km,smd,(num-i));
204  }
205  else
206  EVP_DigestFinal_ex(&m5,km,NULL);
207 
208  km+=MD5_DIGEST_LENGTH;
209  }
210  OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
211  EVP_MD_CTX_cleanup(&m5);
212  EVP_MD_CTX_cleanup(&s1);
213  return 1;
214  }
215 
216 int ssl3_change_cipher_state(SSL *s, int which)
217  {
218  unsigned char *p,*mac_secret;
219  unsigned char exp_key[EVP_MAX_KEY_LENGTH];
220  unsigned char exp_iv[EVP_MAX_IV_LENGTH];
221  unsigned char *ms,*key,*iv,*er1,*er2;
222  EVP_CIPHER_CTX *dd;
223  const EVP_CIPHER *c;
224 #ifndef OPENSSL_NO_COMP
225  COMP_METHOD *comp;
226 #endif
227  const EVP_MD *m;
228  EVP_MD_CTX md;
229  int is_exp,n,i,j,k,cl;
230  int reuse_dd = 0;
231 
232  is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
233  c=s->s3->tmp.new_sym_enc;
234  m=s->s3->tmp.new_hash;
235  /* m == NULL will lead to a crash later */
236  OPENSSL_assert(m);
237 #ifndef OPENSSL_NO_COMP
238  if (s->s3->tmp.new_compression == NULL)
239  comp=NULL;
240  else
241  comp=s->s3->tmp.new_compression->method;
242 #endif
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 
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 
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 
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  /* the last of these zero bytes will be overwritten
516  * with the padding length. */
517  memset(&rec->input[rec->length], 0, i);
518  rec->length+=i;
519  rec->input[l-1]=(i-1);
520  }
521 
522  if (!send)
523  {
524  if (l == 0 || l%bs != 0)
525  {
526  SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
527  ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
528  return 0;
529  }
530  /* otherwise, rec->length >= bs */
531  }
532 
533  EVP_Cipher(ds,rec->data,rec->input,l);
534 
535  if ((bs != 1) && !send)
536  {
537  i=rec->data[l-1]+1;
538  /* SSL 3.0 bounds the number of padding bytes by the block size;
539  * padding bytes (except the last one) are arbitrary */
540  if (i > bs)
541  {
542  /* Incorrect padding. SSLerr() and ssl3_alert are done
543  * by caller: we don't want to reveal whether this is
544  * a decryption error or a MAC verification failure
545  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
546  return -1;
547  }
548  /* now i <= bs <= rec->length */
549  rec->length-=i;
550  }
551  }
552  return(1);
553  }
554 
555 void ssl3_init_finished_mac(SSL *s)
556  {
557  if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
558  if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
559  s->s3->handshake_buffer=BIO_new(BIO_s_mem());
560  (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
561  }
562 
563 void ssl3_free_digest_list(SSL *s)
564  {
565  int i;
566  if (!s->s3->handshake_dgst) return;
567  for (i=0;i<SSL_MAX_DIGEST;i++)
568  {
569  if (s->s3->handshake_dgst[i])
570  EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
571  }
572  OPENSSL_free(s->s3->handshake_dgst);
573  s->s3->handshake_dgst=NULL;
574  }
575 
576 
577 
578 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
579  {
580  if (s->s3->handshake_buffer && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE))
581  {
582  BIO_write (s->s3->handshake_buffer,(void *)buf,len);
583  }
584  else
585  {
586  int i;
587  for (i=0;i< SSL_MAX_DIGEST;i++)
588  {
589  if (s->s3->handshake_dgst[i]!= NULL)
590  EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
591  }
592  }
593  }
594 
595 int ssl3_digest_cached_records(SSL *s)
596  {
597  int i;
598  long mask;
599  const EVP_MD *md;
600  long hdatalen;
601  void *hdata;
602 
603  /* Allocate handshake_dgst array */
604  ssl3_free_digest_list(s);
605  s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
606  memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
607  hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
608  if (hdatalen <= 0)
609  {
610  SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
611  return 0;
612  }
613 
614  /* Loop through bitso of algorithm2 field and create MD_CTX-es */
615  for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++)
616  {
617  if ((mask & ssl_get_algorithm2(s)) && md)
618  {
619  s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
620 #ifdef OPENSSL_FIPS
621  if (EVP_MD_nid(md) == NID_md5)
622  {
623  EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i],
624  EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
625  }
626 #endif
627  EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
628  EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
629  }
630  else
631  {
632  s->s3->handshake_dgst[i]=NULL;
633  }
634  }
635  if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE))
636  {
637  /* Free handshake_buffer BIO */
638  BIO_free(s->s3->handshake_buffer);
639  s->s3->handshake_buffer = NULL;
640  }
641 
642  return 1;
643  }
644 
645 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
646  {
647  return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
648  }
649 int ssl3_final_finish_mac(SSL *s,
650  const char *sender, int len, unsigned char *p)
651  {
652  int ret;
653  ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
654  p+=ret;
655  ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
656  return(ret);
657  }
658 static int ssl3_handshake_mac(SSL *s, int md_nid,
659  const char *sender, int len, unsigned char *p)
660  {
661  unsigned int ret;
662  int npad,n;
663  unsigned int i;
664  unsigned char md_buf[EVP_MAX_MD_SIZE];
665  EVP_MD_CTX ctx,*d=NULL;
666 
667  if (s->s3->handshake_buffer)
668  if (!ssl3_digest_cached_records(s))
669  return 0;
670 
671  /* Search for digest of specified type in the handshake_dgst
672  * array*/
673  for (i=0;i<SSL_MAX_DIGEST;i++)
674  {
675  if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
676  {
677  d=s->s3->handshake_dgst[i];
678  break;
679  }
680  }
681  if (!d) {
682  SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
683  return 0;
684  }
685  EVP_MD_CTX_init(&ctx);
686  EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
687  EVP_MD_CTX_copy_ex(&ctx,d);
688  n=EVP_MD_CTX_size(&ctx);
689  if (n < 0)
690  return 0;
691 
692  npad=(48/n)*n;
693  if (sender != NULL)
694  EVP_DigestUpdate(&ctx,sender,len);
695  EVP_DigestUpdate(&ctx,s->session->master_key,
696  s->session->master_key_length);
697  EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
698  EVP_DigestFinal_ex(&ctx,md_buf,&i);
699 
700  EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
701  EVP_DigestUpdate(&ctx,s->session->master_key,
702  s->session->master_key_length);
703  EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
704  EVP_DigestUpdate(&ctx,md_buf,i);
705  EVP_DigestFinal_ex(&ctx,p,&ret);
706 
707  EVP_MD_CTX_cleanup(&ctx);
708 
709  return((int)ret);
710  }
711 
712 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
713  {
714  SSL3_RECORD *rec;
715  unsigned char *mac_sec,*seq;
716  EVP_MD_CTX md_ctx;
717  const EVP_MD_CTX *hash;
718  unsigned char *p,rec_char;
719  unsigned int md_size;
720  int npad;
721  int t;
722 
723  if (send)
724  {
725  rec= &(ssl->s3->wrec);
726  mac_sec= &(ssl->s3->write_mac_secret[0]);
727  seq= &(ssl->s3->write_sequence[0]);
728  hash=ssl->write_hash;
729  }
730  else
731  {
732  rec= &(ssl->s3->rrec);
733  mac_sec= &(ssl->s3->read_mac_secret[0]);
734  seq= &(ssl->s3->read_sequence[0]);
735  hash=ssl->read_hash;
736  }
737 
738  t=EVP_MD_CTX_size(hash);
739  if (t < 0)
740  return -1;
741  md_size=t;
742  npad=(48/md_size)*md_size;
743 
744  /* Chop the digest off the end :-) */
745  EVP_MD_CTX_init(&md_ctx);
746 
747  EVP_MD_CTX_copy_ex( &md_ctx,hash);
748  EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
749  EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
750  EVP_DigestUpdate(&md_ctx,seq,8);
751  rec_char=rec->type;
752  EVP_DigestUpdate(&md_ctx,&rec_char,1);
753  p=md;
754  s2n(rec->length,p);
755  EVP_DigestUpdate(&md_ctx,md,2);
756  EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
757  EVP_DigestFinal_ex( &md_ctx,md,NULL);
758 
759  EVP_MD_CTX_copy_ex( &md_ctx,hash);
760  EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
761  EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
762  EVP_DigestUpdate(&md_ctx,md,md_size);
763  EVP_DigestFinal_ex( &md_ctx,md,&md_size);
764 
765  EVP_MD_CTX_cleanup(&md_ctx);
766 
767  ssl3_record_sequence_update(seq);
768  return(md_size);
769  }
770 
771 void ssl3_record_sequence_update(unsigned char *seq)
772  {
773  int i;
774 
775  for (i=7; i>=0; i--)
776  {
777  ++seq[i];
778  if (seq[i] != 0) break;
779  }
780  }
781 
782 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
783  int len)
784  {
785  static const unsigned char *salt[3]={
786 #ifndef CHARSET_EBCDIC
787  (const unsigned char *)"A",
788  (const unsigned char *)"BB",
789  (const unsigned char *)"CCC",
790 #else
791  (const unsigned char *)"\x41",
792  (const unsigned char *)"\x42\x42",
793  (const unsigned char *)"\x43\x43\x43",
794 #endif
795  };
796  unsigned char buf[EVP_MAX_MD_SIZE];
797  EVP_MD_CTX ctx;
798  int i,ret=0;
799  unsigned int n;
800 
801  EVP_MD_CTX_init(&ctx);
802  for (i=0; i<3; i++)
803  {
804  EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
805  EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
806  EVP_DigestUpdate(&ctx,p,len);
807  EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
808  SSL3_RANDOM_SIZE);
809  EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
810  SSL3_RANDOM_SIZE);
811  EVP_DigestFinal_ex(&ctx,buf,&n);
812 
813  EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
814  EVP_DigestUpdate(&ctx,p,len);
815  EVP_DigestUpdate(&ctx,buf,n);
816  EVP_DigestFinal_ex(&ctx,out,&n);
817  out+=n;
818  ret+=n;
819  }
820  EVP_MD_CTX_cleanup(&ctx);
821  return(ret);
822  }
823 
824 int ssl3_alert_code(int code)
825  {
826  switch (code)
827  {
828  case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY);
829  case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
830  case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC);
831  case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC);
832  case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC);
833  case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
834  case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE);
835  case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE);
836  case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE);
837  case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
838  case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
839  case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
840  case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
841  case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER);
842  case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE);
843  case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE);
844  case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
845  case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
846  case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
847  case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE);
848  case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
849  case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE);
850  case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE);
851  case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */
852  case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
853  case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
854  case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE);
855  case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
856  case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
857  case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
858  default: return(-1);
859  }
860  }
861 
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