ssl/s3_enc.c

   1 /* ssl/s3_enc.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2005 Nokia. All rights reserved.
 113  *
 114  * The portions of the attached software ("Contribution") is developed by
 115  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 116  * license.
 117  *
 118  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 119  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 120  * support (see RFC 4279) to OpenSSL.
 121  *
 122  * No patent licenses or other rights except those expressly stated in
 123  * the OpenSSL open source license shall be deemed granted or received
 124  * expressly, by implication, estoppel, or otherwise.
 125  *
 126  * No assurances are provided by Nokia that the Contribution does not
 127  * infringe the patent or other intellectual property rights of any third
 128  * party or that the license provides you with all the necessary rights
 129  * to make use of the Contribution.
 130  *
 131  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 132  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 133  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 134  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 135  * OTHERWISE.
 136  */
 137
 138 #include <stdio.h>
 139 #include "ssl_locl.h"
 140 #include <openssl/evp.h>
 141 #include <openssl/md5.h>
 142
 143 static unsigned char ssl3_pad_1[48]={
 144         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 145         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 146         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 147         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 148         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 149         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
 150
 151 static unsigned char ssl3_pad_2[48]={
 152         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 153         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 154         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 155         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 156         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 157         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
 158 static int ssl3_handshake_mac(SSL *s, int md_nid,
 159         const char *sender, int len, unsigned char *p);
 160 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
 161         {
 162         EVP_MD_CTX m5;
 163         EVP_MD_CTX s1;
 164         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
 165         unsigned char c='A';
 166         unsigned int i,j,k;
 167
 168 #ifdef CHARSET_EBCDIC
 169         c = os_toascii[c]; /*'A' in ASCII */
 170 #endif
 171         k=0;
 172         EVP_MD_CTX_init(&m5);
 173         EVP_MD_CTX_init(&s1);
 174         for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
 175                 {
 176                 k++;
 177                 if (k > sizeof buf)
 178                         {
 179                         /* bug: 'buf' is too small for this ciphersuite */
 180                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
 181                         return 0;
 182                         }
 183
 184                 for (j=0; j<k; j++)
 185                         buf[j]=c;
 186                 c++;
 187                 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
 188                 EVP_DigestUpdate(&s1,buf,k);
 189                 EVP_DigestUpdate(&s1,s->session->master_key,
 190                         s->session->master_key_length);
 191                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 192                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 193                 EVP_DigestFinal_ex(&s1,smd,NULL);
 194
 195                 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
 196                 EVP_DigestUpdate(&m5,s->session->master_key,
 197                         s->session->master_key_length);
 198                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
 199                 if ((int)(i+MD5_DIGEST_LENGTH) > num)
 200                         {
 201                         EVP_DigestFinal_ex(&m5,smd,NULL);
 202                         memcpy(km,smd,(num-i));
 203                         }
 204                 else
 205                         EVP_DigestFinal_ex(&m5,km,NULL);
 206
 207                 km+=MD5_DIGEST_LENGTH;
 208                 }
 209         OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
 210         EVP_MD_CTX_cleanup(&m5);
 211         EVP_MD_CTX_cleanup(&s1);
 212         return 1;
 213         }
 214
 215 int ssl3_change_cipher_state(SSL *s, int which)
 216         {
 217         unsigned char *p,*key_block,*mac_secret;
 218         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 219         unsigned char exp_iv[EVP_MAX_IV_LENGTH];
 220         unsigned char *ms,*key,*iv,*er1,*er2;
 221         EVP_CIPHER_CTX *dd;
 222         const EVP_CIPHER *c;
 223 #ifndef OPENSSL_NO_COMP
 224         COMP_METHOD *comp;
 225 #endif
 226         const EVP_MD *m;
 227         EVP_MD_CTX md;
 228         int is_exp,n,i,j,k,cl;
 229         int reuse_dd = 0;
 230
 231         is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 232         c=s->s3->tmp.new_sym_enc;
 233         m=s->s3->tmp.new_hash;
 234 #ifndef OPENSSL_NO_COMP
 235         if (s->s3->tmp.new_compression == NULL)
 236                 comp=NULL;
 237         else
 238                 comp=s->s3->tmp.new_compression->method;
 239 #endif
 240         key_block=s->s3->tmp.key_block;
 241
 242         if (which & SSL3_CC_READ)
 243                 {
 244                 if (s->enc_read_ctx != NULL)
 245                         reuse_dd = 1;
 246                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 247                         goto err;
 248                 else
 249                         /* make sure it's intialized in case we exit later with an error */
 250                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 251                 dd= s->enc_read_ctx;
 252
 253                 ssl_replace_hash(&s->read_hash,m);
 254 #ifndef OPENSSL_NO_COMP
 255                 /* COMPRESS */
 256                 if (s->expand != NULL)
 257                         {
 258                         COMP_CTX_free(s->expand);
 259                         s->expand=NULL;
 260                         }
 261                 if (comp != NULL)
 262                         {
 263                         s->expand=COMP_CTX_new(comp);
 264                         if (s->expand == NULL)
 265                                 {
 266                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 267                                 goto err2;
 268                                 }
 269                         if (s->s3->rrec.comp == NULL)
 270                                 s->s3->rrec.comp=(unsigned char *)
 271                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 272                         if (s->s3->rrec.comp == NULL)
 273                                 goto err;
 274                         }
 275 #endif
 276                 memset(&(s->s3->read_sequence[0]),0,8);
 277                 mac_secret= &(s->s3->read_mac_secret[0]);
 278                 }
 279         else
 280                 {
 281                 if (s->enc_write_ctx != NULL)
 282                         reuse_dd = 1;
 283                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 284                         goto err;
 285                 else
 286                         /* make sure it's intialized in case we exit later with an error */
 287                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 288                 dd= s->enc_write_ctx;
 289                 ssl_replace_hash(&s->write_hash,m);
 290 #ifndef OPENSSL_NO_COMP
 291                 /* COMPRESS */
 292                 if (s->compress != NULL)
 293                         {
 294                         COMP_CTX_free(s->compress);
 295                         s->compress=NULL;
 296                         }
 297                 if (comp != NULL)
 298                         {
 299                         s->compress=COMP_CTX_new(comp);
 300                         if (s->compress == NULL)
 301                                 {
 302                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 303                                 goto err2;
 304                                 }
 305                         }
 306 #endif
 307                 memset(&(s->s3->write_sequence[0]),0,8);
 308                 mac_secret= &(s->s3->write_mac_secret[0]);
 309                 }
 310
 311         if (reuse_dd)
 312                 EVP_CIPHER_CTX_cleanup(dd);
 313
 314         p=s->s3->tmp.key_block;
 315         i=EVP_MD_size(m);
 316         cl=EVP_CIPHER_key_length(c);
 317         j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 318                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 319         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
 320         k=EVP_CIPHER_iv_length(c);
 321         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 322                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 323                 {
 324                 ms=  &(p[ 0]); n=i+i;
 325                 key= &(p[ n]); n+=j+j;
 326                 iv=  &(p[ n]); n+=k+k;
 327                 er1= &(s->s3->client_random[0]);
 328                 er2= &(s->s3->server_random[0]);
 329                 }
 330         else
 331                 {
 332                 n=i;
 333                 ms=  &(p[ n]); n+=i+j;
 334                 key= &(p[ n]); n+=j+k;
 335                 iv=  &(p[ n]); n+=k;
 336                 er1= &(s->s3->server_random[0]);
 337                 er2= &(s->s3->client_random[0]);
 338                 }
 339
 340         if (n > s->s3->tmp.key_block_length)
 341                 {
 342                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 343                 goto err2;
 344                 }
 345
 346         EVP_MD_CTX_init(&md);
 347         memcpy(mac_secret,ms,i);
 348         if (is_exp)
 349                 {
 350                 /* In here I set both the read and write key/iv to the
 351                  * same value since only the correct one will be used :-).
 352                  */
 353                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 354                 EVP_DigestUpdate(&md,key,j);
 355                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 356                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 357                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
 358                 key= &(exp_key[0]);
 359
 360                 if (k > 0)
 361                         {
 362                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 363                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 364                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 365                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
 366                         iv= &(exp_iv[0]);
 367                         }
 368                 }
 369
 370         s->session->key_arg_length=0;
 371
 372         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 373
 374         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
 375         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
 376         EVP_MD_CTX_cleanup(&md);
 377         return(1);
 378 err:
 379         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 380 err2:
 381         return(0);
 382         }
 383
 384 int ssl3_setup_key_block(SSL *s)
 385         {
 386         unsigned char *p;
 387         const EVP_CIPHER *c;
 388         const EVP_MD *hash;
 389         int num;
 390         int ret = 0;
 391         SSL_COMP *comp;
 392
 393         if (s->s3->tmp.key_block_length != 0)
 394                 return(1);
 395
 396         if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp))
 397                 {
 398                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 399                 return(0);
 400                 }
 401
 402         s->s3->tmp.new_sym_enc=c;
 403         s->s3->tmp.new_hash=hash;
 404 #ifdef OPENSSL_NO_COMP
 405         s->s3->tmp.new_compression=NULL;
 406 #else
 407         s->s3->tmp.new_compression=comp;
 408 #endif
 409
 410         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 411         num*=2;
 412
 413         ssl3_cleanup_key_block(s);
 414
 415         if ((p=OPENSSL_malloc(num)) == NULL)
 416                 goto err;
 417
 418         s->s3->tmp.key_block_length=num;
 419         s->s3->tmp.key_block=p;
 420
 421         ret = ssl3_generate_key_block(s,p,num);
 422
 423         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 424                 {
 425                 /* enable vulnerability countermeasure for CBC ciphers with
 426                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 427                  */
 428                 s->s3->need_empty_fragments = 1;
 429
 430                 if (s->session->cipher != NULL)
 431                         {
 432                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
 433                                 s->s3->need_empty_fragments = 0;
 434
 435 #ifndef OPENSSL_NO_RC4
 436                         if (s->session->cipher->algorithm_enc == SSL_RC4)
 437                                 s->s3->need_empty_fragments = 0;
 438 #endif
 439                         }
 440                 }
 441
 442         return ret;
 443
 444 err:
 445         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 446         return(0);
 447         }
 448
 449 void ssl3_cleanup_key_block(SSL *s)
 450         {
 451         if (s->s3->tmp.key_block != NULL)
 452                 {
 453                 OPENSSL_cleanse(s->s3->tmp.key_block,
 454                         s->s3->tmp.key_block_length);
 455                 OPENSSL_free(s->s3->tmp.key_block);
 456                 s->s3->tmp.key_block=NULL;
 457                 }
 458         s->s3->tmp.key_block_length=0;
 459         }
 460
 461 int ssl3_enc(SSL *s, int send)
 462         {
 463         SSL3_RECORD *rec;
 464         EVP_CIPHER_CTX *ds;
 465         unsigned long l;
 466         int bs,i;
 467         const EVP_CIPHER *enc;
 468
 469         if (send)
 470                 {
 471                 ds=s->enc_write_ctx;
 472                 rec= &(s->s3->wrec);
 473                 if (s->enc_write_ctx == NULL)
 474                         enc=NULL;
 475                 else
 476                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 477                 }
 478         else
 479                 {
 480                 ds=s->enc_read_ctx;
 481                 rec= &(s->s3->rrec);
 482                 if (s->enc_read_ctx == NULL)
 483                         enc=NULL;
 484                 else
 485                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 486                 }
 487
 488         if ((s->session == NULL) || (ds == NULL) ||
 489                 (enc == NULL))
 490                 {
 491                 memmove(rec->data,rec->input,rec->length);
 492                 rec->input=rec->data;
 493                 }
 494         else
 495                 {
 496                 l=rec->length;
 497                 bs=EVP_CIPHER_block_size(ds->cipher);
 498
 499                 /* COMPRESS */
 500
 501                 if ((bs != 1) && send)
 502                         {
 503                         i=bs-((int)l%bs);
 504
 505                         /* we need to add 'i-1' padding bytes */
 506                         l+=i;
 507                         rec->length+=i;
 508                         rec->input[l-1]=(i-1);
 509                         }
 510
 511                 if (!send)
 512                         {
 513                         if (l == 0 || l%bs != 0)
 514                                 {
 515                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 516                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 517                                 return 0;
 518                                 }
 519                         /* otherwise, rec->length >= bs */
 520                         }
 521
 522                 EVP_Cipher(ds,rec->data,rec->input,l);
 523
 524                 if ((bs != 1) && !send)
 525                         {
 526                         i=rec->data[l-1]+1;
 527                         /* SSL 3.0 bounds the number of padding bytes by the block size;
 528                          * padding bytes (except the last one) are arbitrary */
 529                         if (i > bs)
 530                                 {
 531                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 532                                  * by caller: we don't want to reveal whether this is
 533                                  * a decryption error or a MAC verification failure
 534                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 535                                 return -1;
 536                                 }
 537                         /* now i <= bs <= rec->length */
 538                         rec->length-=i;
 539                         }
 540                 }
 541         return(1);
 542         }
 543
 544 void ssl3_init_finished_mac(SSL *s)
 545         {
 546         if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
 547         if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
 548     s->s3->handshake_buffer=BIO_new(BIO_s_mem());
 549         (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
 550         }
 551
 552 void ssl3_free_digest_list(SSL *s)
 553         {
 554         int i;
 555         if (!s->s3->handshake_dgst) return;
 556         for (i=0;i<SSL_MAX_DIGEST;i++)
 557                 {
 558                 if (s->s3->handshake_dgst[i])
 559                         EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
 560                 }
 561         OPENSSL_free(s->s3->handshake_dgst);
 562         s->s3->handshake_dgst=NULL;
 563         }
 564
 565
 566
 567 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 568         {
 569         if (s->s3->handshake_buffer)
 570                 {
 571                 BIO_write (s->s3->handshake_buffer,(void *)buf,len);
 572                 }
 573         else
 574                 {
 575                 int i;
 576                 for (i=0;i< SSL_MAX_DIGEST;i++)
 577                         {
 578                         if (s->s3->handshake_dgst[i]!= NULL)
 579                         EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
 580                         }
 581                 }
 582         }
 583 void ssl3_digest_cached_records(SSL *s)
 584         {
 585                 int i;
 586                 long mask;
 587                 const EVP_MD *md;
 588                 long hdatalen;
 589                 void *hdata;
 590                 /* Allocate handshake_dgst array */
 591                 ssl3_free_digest_list(s);
 592                 s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
 593                 memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
 594                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
 595                 /* Loop through bitso of algorithm2 field and create MD_CTX-es */
 596                 for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++)
 597                         {
 598                                 if ((mask & s->s3->tmp.new_cipher->algorithm2) && md)
 599                                 {
 600                                         s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
 601                                         EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
 602                                         EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
 603                                 }
 604                                 else
 605                                 {
 606                                         s->s3->handshake_dgst[i]=NULL;
 607                                 }
 608                         }
 609                 /* Free handshake_buffer BIO */
 610                 BIO_free(s->s3->handshake_buffer);
 611                 s->s3->handshake_buffer = NULL;
 612
 613         }
 614 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
 615         {
 616         return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
 617         }
 618 int ssl3_final_finish_mac(SSL *s,
 619              const char *sender, int len, unsigned char *p)
 620         {
 621         int ret;
 622         ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
 623         p+=ret;
 624         ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
 625         return(ret);
 626         }
 627 static int ssl3_handshake_mac(SSL *s, int md_nid,
 628              const char *sender, int len, unsigned char *p)
 629         {
 630         unsigned int ret;
 631         int npad,n;
 632         unsigned int i;
 633         unsigned char md_buf[EVP_MAX_MD_SIZE];
 634         EVP_MD_CTX ctx,*d=NULL;
 635         if (s->s3->handshake_buffer)
 636                 ssl3_digest_cached_records(s);
 637
 638         /* Search for djgest of specified type  in the handshake_dgst
 639          * array*/
 640         for (i=0;i<SSL_MAX_DIGEST;i++)
 641                 {
 642                   if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
 643                         {
 644                         d=s->s3->handshake_dgst[i];
 645                         break;
 646                         }
 647                 }
 648         if (!d) {
 649                 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
 650                 return 0;
 651         }
 652         EVP_MD_CTX_init(&ctx);
 653         EVP_MD_CTX_copy_ex(&ctx,d);
 654         n=EVP_MD_CTX_size(&ctx);
 655         npad=(48/n)*n;
 656         if (sender != NULL)
 657                 EVP_DigestUpdate(&ctx,sender,len);
 658         EVP_DigestUpdate(&ctx,s->session->master_key,
 659                 s->session->master_key_length);
 660         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 661         EVP_DigestFinal_ex(&ctx,md_buf,&i);
 662
 663         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
 664         EVP_DigestUpdate(&ctx,s->session->master_key,
 665                 s->session->master_key_length);
 666         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 667         EVP_DigestUpdate(&ctx,md_buf,i);
 668         EVP_DigestFinal_ex(&ctx,p,&ret);
 669
 670         EVP_MD_CTX_cleanup(&ctx);
 671
 672         return((int)ret);
 673         }
 674
 675 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 676         {
 677         SSL3_RECORD *rec;
 678         unsigned char *mac_sec,*seq;
 679         EVP_MD_CTX md_ctx;
 680         const EVP_MD_CTX *hash;
 681         unsigned char *p,rec_char;
 682         unsigned int md_size;
 683         int npad;
 684
 685         if (send)
 686                 {
 687                 rec= &(ssl->s3->wrec);
 688                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 689                 seq= &(ssl->s3->write_sequence[0]);
 690                 hash=ssl->write_hash;
 691                 }
 692         else
 693                 {
 694                 rec= &(ssl->s3->rrec);
 695                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 696                 seq= &(ssl->s3->read_sequence[0]);
 697                 hash=ssl->read_hash;
 698                 }
 699
 700         md_size=EVP_MD_CTX_size(hash);
 701         npad=(48/md_size)*md_size;
 702
 703         /* Chop the digest off the end :-) */
 704         EVP_MD_CTX_init(&md_ctx);
 705
 706         EVP_MD_CTX_copy_ex( &md_ctx,hash);
 707         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 708         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 709         EVP_DigestUpdate(&md_ctx,seq,8);
 710         rec_char=rec->type;
 711         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 712         p=md;
 713         s2n(rec->length,p);
 714         EVP_DigestUpdate(&md_ctx,md,2);
 715         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 716         EVP_DigestFinal_ex( &md_ctx,md,NULL);
 717
 718         EVP_MD_CTX_copy_ex( &md_ctx,hash);
 719         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 720         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 721         EVP_DigestUpdate(&md_ctx,md,md_size);
 722         EVP_DigestFinal_ex( &md_ctx,md,&md_size);
 723
 724         EVP_MD_CTX_cleanup(&md_ctx);
 725
 726         ssl3_record_sequence_update(seq);
 727         return(md_size);
 728         }
 729
 730 void ssl3_record_sequence_update(unsigned char *seq)
 731         {
 732         int i;
 733
 734         for (i=7; i>=0; i--)
 735                 {
 736                 ++seq[i];
 737                 if (seq[i] != 0) break;
 738                 }
 739         }
 740
 741 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 742              int len)
 743         {
 744         static const unsigned char *salt[3]={
 745 #ifndef CHARSET_EBCDIC
 746                 (const unsigned char *)"A",
 747                 (const unsigned char *)"BB",
 748                 (const unsigned char *)"CCC",
 749 #else
 750                 (const unsigned char *)"\x41",
 751                 (const unsigned char *)"\x42\x42",
 752                 (const unsigned char *)"\x43\x43\x43",
 753 #endif
 754                 };
 755         unsigned char buf[EVP_MAX_MD_SIZE];
 756         EVP_MD_CTX ctx;
 757         int i,ret=0;
 758         unsigned int n;
 759
 760         EVP_MD_CTX_init(&ctx);
 761         for (i=0; i<3; i++)
 762                 {
 763                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
 764                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 765                 EVP_DigestUpdate(&ctx,p,len);
 766                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 767                         SSL3_RANDOM_SIZE);
 768                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 769                         SSL3_RANDOM_SIZE);
 770                 EVP_DigestFinal_ex(&ctx,buf,&n);
 771
 772                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
 773                 EVP_DigestUpdate(&ctx,p,len);
 774                 EVP_DigestUpdate(&ctx,buf,n);
 775                 EVP_DigestFinal_ex(&ctx,out,&n);
 776                 out+=n;
 777                 ret+=n;
 778                 }
 779         EVP_MD_CTX_cleanup(&ctx);
 780         return(ret);
 781         }
 782
 783 int ssl3_alert_code(int code)
 784         {
 785         switch (code)
 786                 {
 787         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 788         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 789         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 790         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 791         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 792         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 793         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 794         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 795         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 796         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 797         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 798         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 799         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 800         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 801         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 802         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 803         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 804         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 805         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 806         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 807         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 808         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 809         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 810         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 811         case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
 812         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
 813         case SSL_AD_UNRECOGNIZED_NAME:  return(SSL3_AD_HANDSHAKE_FAILURE);
 814         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
 815         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
 816         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 817         default:                        return(-1);
 818                 }
 819         }
 820