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
 159 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 160         const char *sender, int len, unsigned char *p);
 161
 162 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
 163         {
 164         EVP_MD_CTX m5;
 165         EVP_MD_CTX s1;
 166         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
 167         unsigned char c='A';
 168         unsigned int i,j,k;
 169
 170 #ifdef CHARSET_EBCDIC
 171         c = os_toascii[c]; /*'A' in ASCII */
 172 #endif
 173         k=0;
 174         EVP_MD_CTX_init(&m5);
 175         EVP_MD_CTX_init(&s1);
 176         for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
 177                 {
 178                 k++;
 179                 if (k > sizeof buf)
 180                         {
 181                         /* bug: 'buf' is too small for this ciphersuite */
 182                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
 183                         return 0;
 184                         }
 185
 186                 for (j=0; j<k; j++)
 187                         buf[j]=c;
 188                 c++;
 189                 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
 190                 EVP_DigestUpdate(&s1,buf,k);
 191                 EVP_DigestUpdate(&s1,s->session->master_key,
 192                         s->session->master_key_length);
 193                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 194                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 195                 EVP_DigestFinal_ex(&s1,smd,NULL);
 196
 197                 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
 198                 EVP_DigestUpdate(&m5,s->session->master_key,
 199                         s->session->master_key_length);
 200                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
 201                 if ((int)(i+MD5_DIGEST_LENGTH) > num)
 202                         {
 203                         EVP_DigestFinal_ex(&m5,smd,NULL);
 204                         memcpy(km,smd,(num-i));
 205                         }
 206                 else
 207                         EVP_DigestFinal_ex(&m5,km,NULL);
 208
 209                 km+=MD5_DIGEST_LENGTH;
 210                 }
 211         OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
 212         EVP_MD_CTX_cleanup(&m5);
 213         EVP_MD_CTX_cleanup(&s1);
 214         return 1;
 215         }
 216
 217 int ssl3_change_cipher_state(SSL *s, int which)
 218         {
 219         unsigned char *p,*key_block,*mac_secret;
 220         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 221         unsigned char exp_iv[EVP_MAX_IV_LENGTH];
 222         unsigned char *ms,*key,*iv,*er1,*er2;
 223         EVP_CIPHER_CTX *dd;
 224         const EVP_CIPHER *c;
 225 #ifndef OPENSSL_NO_COMP
 226         COMP_METHOD *comp;
 227 #endif
 228         const EVP_MD *m;
 229         EVP_MD_CTX md;
 230         int is_exp,n,i,j,k,cl;
 231         int reuse_dd = 0;
 232
 233         is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 234         c=s->s3->tmp.new_sym_enc;
 235         m=s->s3->tmp.new_hash;
 236 #ifndef OPENSSL_NO_COMP
 237         if (s->s3->tmp.new_compression == NULL)
 238                 comp=NULL;
 239         else
 240                 comp=s->s3->tmp.new_compression->method;
 241 #endif
 242         key_block=s->s3->tmp.key_block;
 243
 244         if (which & SSL3_CC_READ)
 245                 {
 246                 if (s->enc_read_ctx != NULL)
 247                         reuse_dd = 1;
 248                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 249                         goto err;
 250                 else
 251                         /* make sure it's intialized in case we exit later with an error */
 252                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 253                 dd= s->enc_read_ctx;
 254
 255                 ssl_replace_hash(&s->read_hash,m);
 256 #ifndef OPENSSL_NO_COMP
 257                 /* COMPRESS */
 258                 if (s->expand != NULL)
 259                         {
 260                         COMP_CTX_free(s->expand);
 261                         s->expand=NULL;
 262                         }
 263                 if (comp != NULL)
 264                         {
 265                         s->expand=COMP_CTX_new(comp);
 266                         if (s->expand == NULL)
 267                                 {
 268                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 269                                 goto err2;
 270                                 }
 271                         if (s->s3->rrec.comp == NULL)
 272                                 s->s3->rrec.comp=(unsigned char *)
 273                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 274                         if (s->s3->rrec.comp == NULL)
 275                                 goto err;
 276                         }
 277 #endif
 278                 memset(&(s->s3->read_sequence[0]),0,8);
 279                 mac_secret= &(s->s3->read_mac_secret[0]);
 280                 }
 281         else
 282                 {
 283                 if (s->enc_write_ctx != NULL)
 284                         reuse_dd = 1;
 285                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 286                         goto err;
 287                 else
 288                         /* make sure it's intialized in case we exit later with an error */
 289                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 290                 dd= s->enc_write_ctx;
 291                 ssl_replace_hash(&s->write_hash,m);
 292 #ifndef OPENSSL_NO_COMP
 293                 /* COMPRESS */
 294                 if (s->compress != NULL)
 295                         {
 296                         COMP_CTX_free(s->compress);
 297                         s->compress=NULL;
 298                         }
 299                 if (comp != NULL)
 300                         {
 301                         s->compress=COMP_CTX_new(comp);
 302                         if (s->compress == NULL)
 303                                 {
 304                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 305                                 goto err2;
 306                                 }
 307                         }
 308 #endif
 309                 memset(&(s->s3->write_sequence[0]),0,8);
 310                 mac_secret= &(s->s3->write_mac_secret[0]);
 311                 }
 312
 313         if (reuse_dd)
 314                 EVP_CIPHER_CTX_cleanup(dd);
 315
 316         p=s->s3->tmp.key_block;
 317         i=EVP_MD_size(m);
 318         cl=EVP_CIPHER_key_length(c);
 319         j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 320                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 321         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
 322         k=EVP_CIPHER_iv_length(c);
 323         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 324                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 325                 {
 326                 ms=  &(p[ 0]); n=i+i;
 327                 key= &(p[ n]); n+=j+j;
 328                 iv=  &(p[ n]); n+=k+k;
 329                 er1= &(s->s3->client_random[0]);
 330                 er2= &(s->s3->server_random[0]);
 331                 }
 332         else
 333                 {
 334                 n=i;
 335                 ms=  &(p[ n]); n+=i+j;
 336                 key= &(p[ n]); n+=j+k;
 337                 iv=  &(p[ n]); n+=k;
 338                 er1= &(s->s3->server_random[0]);
 339                 er2= &(s->s3->client_random[0]);
 340                 }
 341
 342         if (n > s->s3->tmp.key_block_length)
 343                 {
 344                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 345                 goto err2;
 346                 }
 347
 348         EVP_MD_CTX_init(&md);
 349         memcpy(mac_secret,ms,i);
 350         if (is_exp)
 351                 {
 352                 /* In here I set both the read and write key/iv to the
 353                  * same value since only the correct one will be used :-).
 354                  */
 355                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 356                 EVP_DigestUpdate(&md,key,j);
 357                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 358                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 359                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
 360                 key= &(exp_key[0]);
 361
 362                 if (k > 0)
 363                         {
 364                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 365                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 366                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 367                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
 368                         iv= &(exp_iv[0]);
 369                         }
 370                 }
 371
 372         s->session->key_arg_length=0;
 373
 374         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 375
 376         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
 377         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
 378         EVP_MD_CTX_cleanup(&md);
 379         return(1);
 380 err:
 381         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 382 err2:
 383         return(0);
 384         }
 385
 386 int ssl3_setup_key_block(SSL *s)
 387         {
 388         unsigned char *p;
 389         const EVP_CIPHER *c;
 390         const EVP_MD *hash;
 391         int num;
 392         int ret = 0;
 393         SSL_COMP *comp;
 394
 395         if (s->s3->tmp.key_block_length != 0)
 396                 return(1);
 397
 398         if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp))
 399                 {
 400                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 401                 return(0);
 402                 }
 403
 404         s->s3->tmp.new_sym_enc=c;
 405         s->s3->tmp.new_hash=hash;
 406 #ifdef OPENSSL_NO_COMP
 407         s->s3->tmp.new_compression=NULL;
 408 #else
 409         s->s3->tmp.new_compression=comp;
 410 #endif
 411
 412         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 413         num*=2;
 414
 415         ssl3_cleanup_key_block(s);
 416
 417         if ((p=OPENSSL_malloc(num)) == NULL)
 418                 goto err;
 419
 420         s->s3->tmp.key_block_length=num;
 421         s->s3->tmp.key_block=p;
 422
 423         ret = ssl3_generate_key_block(s,p,num);
 424
 425         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 426                 {
 427                 /* enable vulnerability countermeasure for CBC ciphers with
 428                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 429                  */
 430                 s->s3->need_empty_fragments = 1;
 431
 432                 if (s->session->cipher != NULL)
 433                         {
 434                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
 435                                 s->s3->need_empty_fragments = 0;
 436
 437 #ifndef OPENSSL_NO_RC4
 438                         if (s->session->cipher->algorithm_enc == SSL_RC4)
 439                                 s->s3->need_empty_fragments = 0;
 440 #endif
 441                         }
 442                 }
 443
 444         return ret;
 445
 446 err:
 447         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 448         return(0);
 449         }
 450
 451 void ssl3_cleanup_key_block(SSL *s)
 452         {
 453         if (s->s3->tmp.key_block != NULL)
 454                 {
 455                 OPENSSL_cleanse(s->s3->tmp.key_block,
 456                         s->s3->tmp.key_block_length);
 457                 OPENSSL_free(s->s3->tmp.key_block);
 458                 s->s3->tmp.key_block=NULL;
 459                 }
 460         s->s3->tmp.key_block_length=0;
 461         }
 462
 463 int ssl3_enc(SSL *s, int send)
 464         {
 465         SSL3_RECORD *rec;
 466         EVP_CIPHER_CTX *ds;
 467         unsigned long l;
 468         int bs,i;
 469         const EVP_CIPHER *enc;
 470
 471         if (send)
 472                 {
 473                 ds=s->enc_write_ctx;
 474                 rec= &(s->s3->wrec);
 475                 if (s->enc_write_ctx == NULL)
 476                         enc=NULL;
 477                 else
 478                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 479                 }
 480         else
 481                 {
 482                 ds=s->enc_read_ctx;
 483                 rec= &(s->s3->rrec);
 484                 if (s->enc_read_ctx == NULL)
 485                         enc=NULL;
 486                 else
 487                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 488                 }
 489
 490         if ((s->session == NULL) || (ds == NULL) ||
 491                 (enc == NULL))
 492                 {
 493                 memmove(rec->data,rec->input,rec->length);
 494                 rec->input=rec->data;
 495                 }
 496         else
 497                 {
 498                 l=rec->length;
 499                 bs=EVP_CIPHER_block_size(ds->cipher);
 500
 501                 /* COMPRESS */
 502
 503                 if ((bs != 1) && send)
 504                         {
 505                         i=bs-((int)l%bs);
 506
 507                         /* we need to add 'i-1' padding bytes */
 508                         l+=i;
 509                         rec->length+=i;
 510                         rec->input[l-1]=(i-1);
 511                         }
 512
 513                 if (!send)
 514                         {
 515                         if (l == 0 || l%bs != 0)
 516                                 {
 517                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 518                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 519                                 return 0;
 520                                 }
 521                         /* otherwise, rec->length >= bs */
 522                         }
 523
 524                 EVP_Cipher(ds,rec->data,rec->input,l);
 525
 526                 if ((bs != 1) && !send)
 527                         {
 528                         i=rec->data[l-1]+1;
 529                         /* SSL 3.0 bounds the number of padding bytes by the block size;
 530                          * padding bytes (except the last one) are arbitrary */
 531                         if (i > bs)
 532                                 {
 533                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 534                                  * by caller: we don't want to reveal whether this is
 535                                  * a decryption error or a MAC verification failure
 536                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 537                                 return -1;
 538                                 }
 539                         /* now i <= bs <= rec->length */
 540                         rec->length-=i;
 541                         }
 542                 }
 543         return(1);
 544         }
 545
 546 void ssl3_init_finished_mac(SSL *s)
 547         {
 548         EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);
 549         EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);
 550         }
 551
 552 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 553         {
 554         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 555         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 556         }
 557
 558 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 559         {
 560         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 561         }
 562
 563 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 564              const char *sender, int len, unsigned char *p)
 565         {
 566         int ret;
 567
 568         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 569         p+=ret;
 570         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 571         return(ret);
 572         }
 573
 574 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 575              const char *sender, int len, unsigned char *p)
 576         {
 577         unsigned int ret;
 578         int npad,n;
 579         unsigned int i;
 580         unsigned char md_buf[EVP_MAX_MD_SIZE];
 581         EVP_MD_CTX ctx;
 582
 583         EVP_MD_CTX_init(&ctx);
 584         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 585         n=EVP_MD_CTX_size(&ctx);
 586         npad=(48/n)*n;
 587
 588         if (sender != NULL)
 589                 EVP_DigestUpdate(&ctx,sender,len);
 590         EVP_DigestUpdate(&ctx,s->session->master_key,
 591                 s->session->master_key_length);
 592         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 593         EVP_DigestFinal_ex(&ctx,md_buf,&i);
 594
 595         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
 596         EVP_DigestUpdate(&ctx,s->session->master_key,
 597                 s->session->master_key_length);
 598         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 599         EVP_DigestUpdate(&ctx,md_buf,i);
 600         EVP_DigestFinal_ex(&ctx,p,&ret);
 601
 602         EVP_MD_CTX_cleanup(&ctx);
 603
 604         return((int)ret);
 605         }
 606
 607 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 608         {
 609         SSL3_RECORD *rec;
 610         unsigned char *mac_sec,*seq;
 611         EVP_MD_CTX md_ctx;
 612         const EVP_MD_CTX *hash;
 613         unsigned char *p,rec_char;
 614         unsigned int md_size;
 615         int npad;
 616
 617         if (send)
 618                 {
 619                 rec= &(ssl->s3->wrec);
 620                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 621                 seq= &(ssl->s3->write_sequence[0]);
 622                 hash=ssl->write_hash;
 623                 }
 624         else
 625                 {
 626                 rec= &(ssl->s3->rrec);
 627                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 628                 seq= &(ssl->s3->read_sequence[0]);
 629                 hash=ssl->read_hash;
 630                 }
 631
 632         md_size=EVP_MD_CTX_size(hash);
 633         npad=(48/md_size)*md_size;
 634
 635         /* Chop the digest off the end :-) */
 636         EVP_MD_CTX_init(&md_ctx);
 637
 638         EVP_MD_CTX_copy_ex( &md_ctx,hash);
 639         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 640         EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 641         EVP_DigestUpdate(&md_ctx,seq,8);
 642         rec_char=rec->type;
 643         EVP_DigestUpdate(&md_ctx,&rec_char,1);
 644         p=md;
 645         s2n(rec->length,p);
 646         EVP_DigestUpdate(&md_ctx,md,2);
 647         EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 648         EVP_DigestFinal_ex( &md_ctx,md,NULL);
 649
 650         EVP_MD_CTX_copy_ex( &md_ctx,hash);
 651         EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 652         EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 653         EVP_DigestUpdate(&md_ctx,md,md_size);
 654         EVP_DigestFinal_ex( &md_ctx,md,&md_size);
 655
 656         EVP_MD_CTX_cleanup(&md_ctx);
 657
 658         ssl3_record_sequence_update(seq);
 659         return(md_size);
 660         }
 661
 662 void ssl3_record_sequence_update(unsigned char *seq)
 663         {
 664         int i;
 665
 666         for (i=7; i>=0; i--)
 667                 {
 668                 ++seq[i];
 669                 if (seq[i] != 0) break;
 670                 }
 671         }
 672
 673 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 674              int len)
 675         {
 676         static const unsigned char *salt[3]={
 677 #ifndef CHARSET_EBCDIC
 678                 (const unsigned char *)"A",
 679                 (const unsigned char *)"BB",
 680                 (const unsigned char *)"CCC",
 681 #else
 682                 (const unsigned char *)"\x41",
 683                 (const unsigned char *)"\x42\x42",
 684                 (const unsigned char *)"\x43\x43\x43",
 685 #endif
 686                 };
 687         unsigned char buf[EVP_MAX_MD_SIZE];
 688         EVP_MD_CTX ctx;
 689         int i,ret=0;
 690         unsigned int n;
 691
 692         EVP_MD_CTX_init(&ctx);
 693         for (i=0; i<3; i++)
 694                 {
 695                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
 696                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 697                 EVP_DigestUpdate(&ctx,p,len);
 698                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 699                         SSL3_RANDOM_SIZE);
 700                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 701                         SSL3_RANDOM_SIZE);
 702                 EVP_DigestFinal_ex(&ctx,buf,&n);
 703
 704                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
 705                 EVP_DigestUpdate(&ctx,p,len);
 706                 EVP_DigestUpdate(&ctx,buf,n);
 707                 EVP_DigestFinal_ex(&ctx,out,&n);
 708                 out+=n;
 709                 ret+=n;
 710                 }
 711         EVP_MD_CTX_cleanup(&ctx);
 712         return(ret);
 713         }
 714
 715 int ssl3_alert_code(int code)
 716         {
 717         switch (code)
 718                 {
 719         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 720         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 721         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 722         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 723         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 724         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 725         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 726         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 727         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 728         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 729         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 730         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 731         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 732         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 733         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 734         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 735         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 736         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 737         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 738         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 739         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 740         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 741         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 742         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 743         case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
 744         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
 745         case SSL_AD_UNRECOGNIZED_NAME:  return(SSL3_AD_HANDSHAKE_FAILURE);
 746         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
 747         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
 748         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 749         default:                        return(-1);
 750                 }
 751         }
 752