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,*mac_secret;
 218         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 219         unsigned char exp_iv[EVP_MAX_IV_LENGTH];
 220         unsigned char *ms,*key,*iv,*er1,*er2;
 221         EVP_CIPHER_CTX *dd;
 222         const EVP_CIPHER *c;
 223 #ifndef OPENSSL_NO_COMP
 224         COMP_METHOD *comp;
 225 #endif
 226         const EVP_MD *m;
 227         EVP_MD_CTX md;
 228         int is_exp,n,i,j,k,cl;
 229         int reuse_dd = 0;
 230
 231         is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 232         c=s->s3->tmp.new_sym_enc;
 233         m=s->s3->tmp.new_hash;
 234         /* m == NULL will lead to a crash later */
 235         OPENSSL_assert(m);
 236 #ifndef OPENSSL_NO_COMP
 237         if (s->s3->tmp.new_compression == NULL)
 238                 comp=NULL;
 239         else
 240                 comp=s->s3->tmp.new_compression->method;
 241 #endif
 242
 243         if (which & SSL3_CC_READ)
 244                 {
 245                 if (s->enc_read_ctx != NULL)
 246                         reuse_dd = 1;
 247                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 248                         goto err;
 249                 else
 250                         /* make sure it's intialized in case we exit later with an error */
 251                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 252                 dd= s->enc_read_ctx;
 253
 254                 ssl_replace_hash(&s->read_hash,m);
 255 #ifndef OPENSSL_NO_COMP
 256                 /* COMPRESS */
 257                 if (s->expand != NULL)
 258                         {
 259                         COMP_CTX_free(s->expand);
 260                         s->expand=NULL;
 261                         }
 262                 if (comp != NULL)
 263                         {
 264                         s->expand=COMP_CTX_new(comp);
 265                         if (s->expand == NULL)
 266                                 {
 267                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 268                                 goto err2;
 269                                 }
 270                         if (s->s3->rrec.comp == NULL)
 271                                 s->s3->rrec.comp=(unsigned char *)
 272                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 273                         if (s->s3->rrec.comp == NULL)
 274                                 goto err;
 275                         }
 276 #endif
 277                 memset(&(s->s3->read_sequence[0]),0,8);
 278                 mac_secret= &(s->s3->read_mac_secret[0]);
 279                 }
 280         else
 281                 {
 282                 if (s->enc_write_ctx != NULL)
 283                         reuse_dd = 1;
 284                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 285                         goto err;
 286                 else
 287                         /* make sure it's intialized in case we exit later with an error */
 288                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 289                 dd= s->enc_write_ctx;
 290                 ssl_replace_hash(&s->write_hash,m);
 291 #ifndef OPENSSL_NO_COMP
 292                 /* COMPRESS */
 293                 if (s->compress != NULL)
 294                         {
 295                         COMP_CTX_free(s->compress);
 296                         s->compress=NULL;
 297                         }
 298                 if (comp != NULL)
 299                         {
 300                         s->compress=COMP_CTX_new(comp);
 301                         if (s->compress == NULL)
 302                                 {
 303                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 304                                 goto err2;
 305                                 }
 306                         }
 307 #endif
 308                 memset(&(s->s3->write_sequence[0]),0,8);
 309                 mac_secret= &(s->s3->write_mac_secret[0]);
 310                 }
 311
 312         if (reuse_dd)
 313                 EVP_CIPHER_CTX_cleanup(dd);
 314
 315         p=s->s3->tmp.key_block;
 316         i=EVP_MD_size(m);
 317         if (i < 0)
 318                 goto err2;
 319         cl=EVP_CIPHER_key_length(c);
 320         j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 321                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 322         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
 323         k=EVP_CIPHER_iv_length(c);
 324         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 325                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 326                 {
 327                 ms=  &(p[ 0]); n=i+i;
 328                 key= &(p[ n]); n+=j+j;
 329                 iv=  &(p[ n]); n+=k+k;
 330                 er1= &(s->s3->client_random[0]);
 331                 er2= &(s->s3->server_random[0]);
 332                 }
 333         else
 334                 {
 335                 n=i;
 336                 ms=  &(p[ n]); n+=i+j;
 337                 key= &(p[ n]); n+=j+k;
 338                 iv=  &(p[ n]); n+=k;
 339                 er1= &(s->s3->server_random[0]);
 340                 er2= &(s->s3->client_random[0]);
 341                 }
 342
 343         if (n > s->s3->tmp.key_block_length)
 344                 {
 345                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 346                 goto err2;
 347                 }
 348
 349         EVP_MD_CTX_init(&md);
 350         memcpy(mac_secret,ms,i);
 351         if (is_exp)
 352                 {
 353                 /* In here I set both the read and write key/iv to the
 354                  * same value since only the correct one will be used :-).
 355                  */
 356                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 357                 EVP_DigestUpdate(&md,key,j);
 358                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 359                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 360                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
 361                 key= &(exp_key[0]);
 362
 363                 if (k > 0)
 364                         {
 365                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 366                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 367                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 368                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
 369                         iv= &(exp_iv[0]);
 370                         }
 371                 }
 372
 373         s->session->key_arg_length=0;
 374
 375         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 376
 377         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
 378         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
 379         EVP_MD_CTX_cleanup(&md);
 380         return(1);
 381 err:
 382         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 383 err2:
 384         return(0);
 385         }
 386
 387 int ssl3_setup_key_block(SSL *s)
 388         {
 389         unsigned char *p;
 390         const EVP_CIPHER *c;
 391         const EVP_MD *hash;
 392         int num;
 393         int ret = 0;
 394         SSL_COMP *comp;
 395
 396         if (s->s3->tmp.key_block_length != 0)
 397                 return(1);
 398
 399         if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp))
 400                 {
 401                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 402                 return(0);
 403                 }
 404
 405         s->s3->tmp.new_sym_enc=c;
 406         s->s3->tmp.new_hash=hash;
 407 #ifdef OPENSSL_NO_COMP
 408         s->s3->tmp.new_compression=NULL;
 409 #else
 410         s->s3->tmp.new_compression=comp;
 411 #endif
 412
 413         num=EVP_MD_size(hash);
 414         if (num < 0)
 415                 return 0;
 416
 417         num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c);
 418         num*=2;
 419
 420         ssl3_cleanup_key_block(s);
 421
 422         if ((p=OPENSSL_malloc(num)) == NULL)
 423                 goto err;
 424
 425         s->s3->tmp.key_block_length=num;
 426         s->s3->tmp.key_block=p;
 427
 428         ret = ssl3_generate_key_block(s,p,num);
 429
 430         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 431                 {
 432                 /* enable vulnerability countermeasure for CBC ciphers with
 433                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 434                  */
 435                 s->s3->need_empty_fragments = 1;
 436
 437                 if (s->session->cipher != NULL)
 438                         {
 439                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
 440                                 s->s3->need_empty_fragments = 0;
 441
 442 #ifndef OPENSSL_NO_RC4
 443                         if (s->session->cipher->algorithm_enc == SSL_RC4)
 444                                 s->s3->need_empty_fragments = 0;
 445 #endif
 446                         }
 447                 }
 448
 449         return ret;
 450
 451 err:
 452         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 453         return(0);
 454         }
 455
 456 void ssl3_cleanup_key_block(SSL *s)
 457         {
 458         if (s->s3->tmp.key_block != NULL)
 459                 {
 460                 OPENSSL_cleanse(s->s3->tmp.key_block,
 461                         s->s3->tmp.key_block_length);
 462                 OPENSSL_free(s->s3->tmp.key_block);
 463                 s->s3->tmp.key_block=NULL;
 464                 }
 465         s->s3->tmp.key_block_length=0;
 466         }
 467
 468 /* ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
 469  *
 470  * Returns:
 471  *   0: (in non-constant time) if the record is publically invalid (i.e. too
 472  *       short etc).
 473  *   1: if the record's padding is valid / the encryption was successful.
 474  *   -1: if the record's padding is invalid or, if sending, an internal error
 475  *       occured.
 476  */
 477 int ssl3_enc(SSL *s, int send)
 478         {
 479         SSL3_RECORD *rec;
 480         EVP_CIPHER_CTX *ds;
 481         unsigned long l;
 482         int bs,i,mac_size=0;
 483         const EVP_CIPHER *enc;
 484
 485         if (send)
 486                 {
 487                 ds=s->enc_write_ctx;
 488                 rec= &(s->s3->wrec);
 489                 if (s->enc_write_ctx == NULL)
 490                         enc=NULL;
 491                 else
 492                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 493                 }
 494         else
 495                 {
 496                 ds=s->enc_read_ctx;
 497                 rec= &(s->s3->rrec);
 498                 if (s->enc_read_ctx == NULL)
 499                         enc=NULL;
 500                 else
 501                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 502                 }
 503
 504         if ((s->session == NULL) || (ds == NULL) ||
 505                 (enc == NULL))
 506                 {
 507                 memmove(rec->data,rec->input,rec->length);
 508                 rec->input=rec->data;
 509                 }
 510         else
 511                 {
 512                 l=rec->length;
 513                 bs=EVP_CIPHER_block_size(ds->cipher);
 514
 515                 /* COMPRESS */
 516
 517                 if ((bs != 1) && send)
 518                         {
 519                         i=bs-((int)l%bs);
 520
 521                         /* we need to add 'i-1' padding bytes */
 522                         l+=i;
 523                         /* the last of these zero bytes will be overwritten
 524                          * with the padding length. */
 525                         memset(&rec->input[rec->length], 0, i);
 526                         rec->length+=i;
 527                         rec->input[l-1]=(i-1);
 528                         }
 529
 530                 if (!send)
 531                         {
 532                         if (l == 0 || l%bs != 0)
 533                                 return 0;
 534                         /* otherwise, rec->length >= bs */
 535                         }
 536
 537                 EVP_Cipher(ds,rec->data,rec->input,l);
 538
 539                 if (EVP_MD_CTX_md(s->read_hash) != NULL)
 540                         mac_size = EVP_MD_CTX_size(s->read_hash);
 541                 if ((bs != 1) && !send)
 542                         return ssl3_cbc_remove_padding(s, rec, bs, mac_size);
 543                 }
 544         return(1);
 545         }
 546
 547 void ssl3_init_finished_mac(SSL *s)
 548         {
 549         if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
 550         if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
 551     s->s3->handshake_buffer=BIO_new(BIO_s_mem());
 552         (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
 553         }
 554
 555 void ssl3_free_digest_list(SSL *s)
 556         {
 557         int i;
 558         if (!s->s3->handshake_dgst) return;
 559         for (i=0;i<SSL_MAX_DIGEST;i++)
 560                 {
 561                 if (s->s3->handshake_dgst[i])
 562                         EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
 563                 }
 564         OPENSSL_free(s->s3->handshake_dgst);
 565         s->s3->handshake_dgst=NULL;
 566         }
 567
 568
 569
 570 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 571         {
 572         if (s->s3->handshake_buffer)
 573                 {
 574                 BIO_write (s->s3->handshake_buffer,(void *)buf,len);
 575                 }
 576         else
 577                 {
 578                 int i;
 579                 for (i=0;i< SSL_MAX_DIGEST;i++)
 580                         {
 581                         if (s->s3->handshake_dgst[i]!= NULL)
 582                         EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
 583                         }
 584                 }
 585         }
 586
 587 int ssl3_digest_cached_records(SSL *s)
 588         {
 589         int i;
 590         long mask;
 591         const EVP_MD *md;
 592         long hdatalen;
 593         void *hdata;
 594
 595         /* Allocate handshake_dgst array */
 596         ssl3_free_digest_list(s);
 597         s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
 598         memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
 599         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
 600         if (hdatalen <= 0)
 601                 {
 602                 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
 603                 return 0;
 604                 }
 605
 606         /* Loop through bitso of algorithm2 field and create MD_CTX-es */
 607         for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++)
 608                 {
 609                 if ((mask & s->s3->tmp.new_cipher->algorithm2) && md)
 610                         {
 611                         s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
 612                         EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
 613                         EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
 614                         }
 615                 else
 616                         {
 617                         s->s3->handshake_dgst[i]=NULL;
 618                         }
 619                 }
 620         /* Free handshake_buffer BIO */
 621         BIO_free(s->s3->handshake_buffer);
 622         s->s3->handshake_buffer = NULL;
 623
 624         return 1;
 625         }
 626
 627 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
 628         {
 629         return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
 630         }
 631 int ssl3_final_finish_mac(SSL *s,
 632              const char *sender, int len, unsigned char *p)
 633         {
 634         int ret, sha1len;
 635         ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
 636         if(ret == 0)
 637                 return 0;
 638
 639         p+=ret;
 640
 641         sha1len=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
 642         if(sha1len == 0)
 643                 return 0;
 644
 645         ret+=sha1len;
 646         return(ret);
 647         }
 648 static int ssl3_handshake_mac(SSL *s, int md_nid,
 649              const char *sender, int len, unsigned char *p)
 650         {
 651         unsigned int ret;
 652         int npad,n;
 653         unsigned int i;
 654         unsigned char md_buf[EVP_MAX_MD_SIZE];
 655         EVP_MD_CTX ctx,*d=NULL;
 656
 657         if (s->s3->handshake_buffer)
 658                 if (!ssl3_digest_cached_records(s))
 659                         return 0;
 660
 661         /* Search for digest of specified type in the handshake_dgst
 662          * array*/
 663         for (i=0;i<SSL_MAX_DIGEST;i++)
 664                 {
 665                   if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
 666                         {
 667                         d=s->s3->handshake_dgst[i];
 668                         break;
 669                         }
 670                 }
 671         if (!d) {
 672                 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
 673                 return 0;
 674         }
 675         EVP_MD_CTX_init(&ctx);
 676         EVP_MD_CTX_copy_ex(&ctx,d);
 677         n=EVP_MD_CTX_size(&ctx);
 678         if (n < 0)
 679                 return 0;
 680
 681         npad=(48/n)*n;
 682         if (sender != NULL)
 683                 EVP_DigestUpdate(&ctx,sender,len);
 684         EVP_DigestUpdate(&ctx,s->session->master_key,
 685                 s->session->master_key_length);
 686         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 687         EVP_DigestFinal_ex(&ctx,md_buf,&i);
 688
 689         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
 690         EVP_DigestUpdate(&ctx,s->session->master_key,
 691                 s->session->master_key_length);
 692         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 693         EVP_DigestUpdate(&ctx,md_buf,i);
 694         EVP_DigestFinal_ex(&ctx,p,&ret);
 695
 696         EVP_MD_CTX_cleanup(&ctx);
 697
 698         return((int)ret);
 699         }
 700
 701 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
 702         {
 703         SSL3_RECORD *rec;
 704         unsigned char *mac_sec,*seq;
 705         EVP_MD_CTX md_ctx;
 706         const EVP_MD_CTX *hash;
 707         unsigned char *p,rec_char;
 708         size_t md_size, orig_len;
 709         int npad;
 710         int t;
 711
 712         if (send)
 713                 {
 714                 rec= &(ssl->s3->wrec);
 715                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 716                 seq= &(ssl->s3->write_sequence[0]);
 717                 hash=ssl->write_hash;
 718                 }
 719         else
 720                 {
 721                 rec= &(ssl->s3->rrec);
 722                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 723                 seq= &(ssl->s3->read_sequence[0]);
 724                 hash=ssl->read_hash;
 725                 }
 726
 727         t=EVP_MD_CTX_size(hash);
 728         if (t < 0)
 729                 return -1;
 730         md_size=t;
 731         npad=(48/md_size)*md_size;
 732
 733         /* kludge: ssl3_cbc_remove_padding passes padding length in rec->type */
 734         orig_len = rec->length+md_size+((unsigned int)rec->type>>8);
 735         rec->type &= 0xff;
 736
 737         if (!send &&
 738             EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
 739             ssl3_cbc_record_digest_supported(hash))
 740                 {
 741                 /* This is a CBC-encrypted record. We must avoid leaking any
 742                  * timing-side channel information about how many blocks of
 743                  * data we are hashing because that gives an attacker a
 744                  * timing-oracle. */
 745
 746                 /* npad is, at most, 48 bytes and that's with MD5:
 747                  *   16 + 48 + 8 (sequence bytes) + 1 + 2 = 75.
 748                  *
 749                  * With SHA-1 (the largest hash speced for SSLv3) the hash size
 750                  * goes up 4, but npad goes down by 8, resulting in a smaller
 751                  * total size. */
 752                 unsigned char header[75];
 753                 unsigned j = 0;
 754                 memcpy(header+j, mac_sec, md_size);
 755                 j += md_size;
 756                 memcpy(header+j, ssl3_pad_1, npad);
 757                 j += npad;
 758                 memcpy(header+j, seq, 8);
 759                 j += 8;
 760                 header[j++] = rec->type;
 761                 header[j++] = rec->length >> 8;
 762                 header[j++] = rec->length & 0xff;
 763
 764                 ssl3_cbc_digest_record(
 765                         hash,
 766                         md, &md_size,
 767                         header, rec->input,
 768                         rec->length + md_size, orig_len,
 769                         mac_sec, md_size,
 770                         1 /* is SSLv3 */);
 771                 }
 772         else
 773                 {
 774                 unsigned int md_size_u;
 775                 /* Chop the digest off the end :-) */
 776                 EVP_MD_CTX_init(&md_ctx);
 777
 778                 EVP_MD_CTX_copy_ex( &md_ctx,hash);
 779                 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 780                 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 781                 EVP_DigestUpdate(&md_ctx,seq,8);
 782                 rec_char=rec->type;
 783                 EVP_DigestUpdate(&md_ctx,&rec_char,1);
 784                 p=md;
 785                 s2n(rec->length,p);
 786                 EVP_DigestUpdate(&md_ctx,md,2);
 787                 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 788                 EVP_DigestFinal_ex( &md_ctx,md,NULL);
 789
 790                 EVP_MD_CTX_copy_ex( &md_ctx,hash);
 791                 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 792                 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 793                 EVP_DigestUpdate(&md_ctx,md,md_size);
 794                 EVP_DigestFinal_ex( &md_ctx,md,&md_size_u);
 795                 md_size = md_size_u;
 796
 797                 EVP_MD_CTX_cleanup(&md_ctx);
 798         }
 799
 800         ssl3_record_sequence_update(seq);
 801         return(md_size);
 802         }
 803
 804 void ssl3_record_sequence_update(unsigned char *seq)
 805         {
 806         int i;
 807
 808         for (i=7; i>=0; i--)
 809                 {
 810                 ++seq[i];
 811                 if (seq[i] != 0) break;
 812                 }
 813         }
 814
 815 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 816              int len)
 817         {
 818         static const unsigned char *salt[3]={
 819 #ifndef CHARSET_EBCDIC
 820                 (const unsigned char *)"A",
 821                 (const unsigned char *)"BB",
 822                 (const unsigned char *)"CCC",
 823 #else
 824                 (const unsigned char *)"\x41",
 825                 (const unsigned char *)"\x42\x42",
 826                 (const unsigned char *)"\x43\x43\x43",
 827 #endif
 828                 };
 829         unsigned char buf[EVP_MAX_MD_SIZE];
 830         EVP_MD_CTX ctx;
 831         int i,ret=0;
 832         unsigned int n;
 833
 834         EVP_MD_CTX_init(&ctx);
 835         for (i=0; i<3; i++)
 836                 {
 837                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
 838                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 839                 EVP_DigestUpdate(&ctx,p,len);
 840                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 841                         SSL3_RANDOM_SIZE);
 842                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 843                         SSL3_RANDOM_SIZE);
 844                 EVP_DigestFinal_ex(&ctx,buf,&n);
 845
 846                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
 847                 EVP_DigestUpdate(&ctx,p,len);
 848                 EVP_DigestUpdate(&ctx,buf,n);
 849                 EVP_DigestFinal_ex(&ctx,out,&n);
 850                 out+=n;
 851                 ret+=n;
 852                 }
 853         EVP_MD_CTX_cleanup(&ctx);
 854         return(ret);
 855         }
 856
 857 int ssl3_alert_code(int code)
 858         {
 859         switch (code)
 860                 {
 861         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 862         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 863         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 864         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 865         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 866         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 867         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 868         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 869         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 870         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 871         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 872         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 873         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 874         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 875         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 876         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 877         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 878         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 879         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 880         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 881         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 882         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 883         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 884         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 885         case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
 886         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
 887         case SSL_AD_UNRECOGNIZED_NAME:  return(SSL3_AD_HANDSHAKE_FAILURE);
 888         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
 889         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
 890         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 891         case SSL_AD_INAPPROPRIATE_FALLBACK:return(TLS1_AD_INAPPROPRIATE_FALLBACK);
 892         default:                        return(-1);
 893                 }
 894         }