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_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 174         EVP_MD_CTX_init(&s1);
 175         for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
 176                 {
 177                 k++;
 178                 if (k > sizeof buf)
 179                         {
 180                         /* bug: 'buf' is too small for this ciphersuite */
 181                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
 182                         return 0;
 183                         }
 184
 185                 for (j=0; j<k; j++)
 186                         buf[j]=c;
 187                 c++;
 188                 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
 189                 EVP_DigestUpdate(&s1,buf,k);
 190                 EVP_DigestUpdate(&s1,s->session->master_key,
 191                         s->session->master_key_length);
 192                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 193                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 194                 EVP_DigestFinal_ex(&s1,smd,NULL);
 195
 196                 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
 197                 EVP_DigestUpdate(&m5,s->session->master_key,
 198                         s->session->master_key_length);
 199                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
 200                 if ((int)(i+MD5_DIGEST_LENGTH) > num)
 201                         {
 202                         EVP_DigestFinal_ex(&m5,smd,NULL);
 203                         memcpy(km,smd,(num-i));
 204                         }
 205                 else
 206                         EVP_DigestFinal_ex(&m5,km,NULL);
 207
 208                 km+=MD5_DIGEST_LENGTH;
 209                 }
 210         OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
 211         EVP_MD_CTX_cleanup(&m5);
 212         EVP_MD_CTX_cleanup(&s1);
 213         return 1;
 214         }
 215
 216 int ssl3_change_cipher_state(SSL *s, int which)
 217         {
 218         unsigned char *p,*mac_secret;
 219         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 220         unsigned char exp_iv[EVP_MAX_IV_LENGTH];
 221         unsigned char *ms,*key,*iv,*er1,*er2;
 222         EVP_CIPHER_CTX *dd;
 223         const EVP_CIPHER *c;
 224 #ifndef OPENSSL_NO_COMP
 225         COMP_METHOD *comp;
 226 #endif
 227         const EVP_MD *m;
 228         EVP_MD_CTX md;
 229         int is_exp,n,i,j,k,cl;
 230         int reuse_dd = 0;
 231
 232         is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 233         c=s->s3->tmp.new_sym_enc;
 234         m=s->s3->tmp.new_hash;
 235         /* m == NULL will lead to a crash later */
 236         OPENSSL_assert(m);
 237 #ifndef OPENSSL_NO_COMP
 238         if (s->s3->tmp.new_compression == NULL)
 239                 comp=NULL;
 240         else
 241                 comp=s->s3->tmp.new_compression->method;
 242 #endif
 243
 244         if (which & SSL3_CC_READ)
 245                 {
 246                 if (s->enc_read_ctx != NULL)
 247                         reuse_dd = 1;
 248                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 249                         goto err;
 250                 else
 251                         /* make sure it's intialized in case we exit later with an error */
 252                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 253                 dd= s->enc_read_ctx;
 254
 255                 ssl_replace_hash(&s->read_hash,m);
 256 #ifndef OPENSSL_NO_COMP
 257                 /* COMPRESS */
 258                 if (s->expand != NULL)
 259                         {
 260                         COMP_CTX_free(s->expand);
 261                         s->expand=NULL;
 262                         }
 263                 if (comp != NULL)
 264                         {
 265                         s->expand=COMP_CTX_new(comp);
 266                         if (s->expand == NULL)
 267                                 {
 268                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 269                                 goto err2;
 270                                 }
 271                         if (s->s3->rrec.comp == NULL)
 272                                 s->s3->rrec.comp=(unsigned char *)
 273                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 274                         if (s->s3->rrec.comp == NULL)
 275                                 goto err;
 276                         }
 277 #endif
 278                 memset(&(s->s3->read_sequence[0]),0,8);
 279                 mac_secret= &(s->s3->read_mac_secret[0]);
 280                 }
 281         else
 282                 {
 283                 if (s->enc_write_ctx != NULL)
 284                         reuse_dd = 1;
 285                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 286                         goto err;
 287                 else
 288                         /* make sure it's intialized in case we exit later with an error */
 289                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 290                 dd= s->enc_write_ctx;
 291                 ssl_replace_hash(&s->write_hash,m);
 292 #ifndef OPENSSL_NO_COMP
 293                 /* COMPRESS */
 294                 if (s->compress != NULL)
 295                         {
 296                         COMP_CTX_free(s->compress);
 297                         s->compress=NULL;
 298                         }
 299                 if (comp != NULL)
 300                         {
 301                         s->compress=COMP_CTX_new(comp);
 302                         if (s->compress == NULL)
 303                                 {
 304                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 305                                 goto err2;
 306                                 }
 307                         }
 308 #endif
 309                 memset(&(s->s3->write_sequence[0]),0,8);
 310                 mac_secret= &(s->s3->write_mac_secret[0]);
 311                 }
 312
 313         if (reuse_dd)
 314                 EVP_CIPHER_CTX_cleanup(dd);
 315
 316         p=s->s3->tmp.key_block;
 317         i=EVP_MD_size(m);
 318         if (i < 0)
 319                 goto err2;
 320         cl=EVP_CIPHER_key_length(c);
 321         j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 322                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 323         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
 324         k=EVP_CIPHER_iv_length(c);
 325         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 326                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 327                 {
 328                 ms=  &(p[ 0]); n=i+i;
 329                 key= &(p[ n]); n+=j+j;
 330                 iv=  &(p[ n]); n+=k+k;
 331                 er1= &(s->s3->client_random[0]);
 332                 er2= &(s->s3->server_random[0]);
 333                 }
 334         else
 335                 {
 336                 n=i;
 337                 ms=  &(p[ n]); n+=i+j;
 338                 key= &(p[ n]); n+=j+k;
 339                 iv=  &(p[ n]); n+=k;
 340                 er1= &(s->s3->server_random[0]);
 341                 er2= &(s->s3->client_random[0]);
 342                 }
 343
 344         if (n > s->s3->tmp.key_block_length)
 345                 {
 346                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 347                 goto err2;
 348                 }
 349
 350         EVP_MD_CTX_init(&md);
 351         memcpy(mac_secret,ms,i);
 352         if (is_exp)
 353                 {
 354                 /* In here I set both the read and write key/iv to the
 355                  * same value since only the correct one will be used :-).
 356                  */
 357                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 358                 EVP_DigestUpdate(&md,key,j);
 359                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 360                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 361                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
 362                 key= &(exp_key[0]);
 363
 364                 if (k > 0)
 365                         {
 366                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 367                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 368                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 369                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
 370                         iv= &(exp_iv[0]);
 371                         }
 372                 }
 373
 374         s->session->key_arg_length=0;
 375
 376         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 377
 378 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 379         if (s->msg_callback)
 380                 {
 381
 382                 int wh = which & SSL3_CC_WRITE ?
 383                                 TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ;
 384                 s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
 385                                                 mac_secret, EVP_MD_size(m),
 386                                                 s, s->msg_callback_arg);
 387                 if (c->key_len)
 388                         s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
 389                                                 key, c->key_len,
 390                                                 s, s->msg_callback_arg);
 391                 if (k)
 392                         {
 393                         s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV,
 394                                                 iv, k, s, s->msg_callback_arg);
 395                         }
 396                 }
 397 #endif
 398
 399         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
 400         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
 401         EVP_MD_CTX_cleanup(&md);
 402         return(1);
 403 err:
 404         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 405 err2:
 406         return(0);
 407         }
 408
 409 int ssl3_setup_key_block(SSL *s)
 410         {
 411         unsigned char *p;
 412         const EVP_CIPHER *c;
 413         const EVP_MD *hash;
 414         int num;
 415         int ret = 0;
 416         SSL_COMP *comp;
 417
 418         if (s->s3->tmp.key_block_length != 0)
 419                 return(1);
 420
 421         if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp))
 422                 {
 423                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 424                 return(0);
 425                 }
 426
 427         s->s3->tmp.new_sym_enc=c;
 428         s->s3->tmp.new_hash=hash;
 429 #ifdef OPENSSL_NO_COMP
 430         s->s3->tmp.new_compression=NULL;
 431 #else
 432         s->s3->tmp.new_compression=comp;
 433 #endif
 434
 435         num=EVP_MD_size(hash);
 436         if (num < 0)
 437                 return 0;
 438
 439         num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c);
 440         num*=2;
 441
 442         ssl3_cleanup_key_block(s);
 443
 444         if ((p=OPENSSL_malloc(num)) == NULL)
 445                 goto err;
 446
 447         s->s3->tmp.key_block_length=num;
 448         s->s3->tmp.key_block=p;
 449
 450         ret = ssl3_generate_key_block(s,p,num);
 451
 452         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 453                 {
 454                 /* enable vulnerability countermeasure for CBC ciphers with
 455                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 456                  */
 457                 s->s3->need_empty_fragments = 1;
 458
 459                 if (s->session->cipher != NULL)
 460                         {
 461                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
 462                                 s->s3->need_empty_fragments = 0;
 463
 464 #ifndef OPENSSL_NO_RC4
 465                         if (s->session->cipher->algorithm_enc == SSL_RC4)
 466                                 s->s3->need_empty_fragments = 0;
 467 #endif
 468                         }
 469                 }
 470
 471         return ret;
 472
 473 err:
 474         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 475         return(0);
 476         }
 477
 478 void ssl3_cleanup_key_block(SSL *s)
 479         {
 480         if (s->s3->tmp.key_block != NULL)
 481                 {
 482                 OPENSSL_cleanse(s->s3->tmp.key_block,
 483                         s->s3->tmp.key_block_length);
 484                 OPENSSL_free(s->s3->tmp.key_block);
 485                 s->s3->tmp.key_block=NULL;
 486                 }
 487         s->s3->tmp.key_block_length=0;
 488         }
 489
 490 int ssl3_enc(SSL *s, int send)
 491         {
 492         SSL3_RECORD *rec;
 493         EVP_CIPHER_CTX *ds;
 494         unsigned long l;
 495         int bs,i,mac_size=0;
 496         const EVP_CIPHER *enc;
 497
 498         if (send)
 499                 {
 500                 ds=s->enc_write_ctx;
 501                 rec= &(s->s3->wrec);
 502                 if (s->enc_write_ctx == NULL)
 503                         enc=NULL;
 504                 else
 505                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 506                 }
 507         else
 508                 {
 509                 ds=s->enc_read_ctx;
 510                 rec= &(s->s3->rrec);
 511                 if (s->enc_read_ctx == NULL)
 512                         enc=NULL;
 513                 else
 514                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 515                 }
 516
 517         if ((s->session == NULL) || (ds == NULL) ||
 518                 (enc == NULL))
 519                 {
 520                 memmove(rec->data,rec->input,rec->length);
 521                 rec->input=rec->data;
 522                 }
 523         else
 524                 {
 525                 l=rec->length;
 526                 bs=EVP_CIPHER_block_size(ds->cipher);
 527
 528                 /* COMPRESS */
 529
 530                 if ((bs != 1) && send)
 531                         {
 532                         i=bs-((int)l%bs);
 533
 534                         /* we need to add 'i-1' padding bytes */
 535                         l+=i;
 536                         /* the last of these zero bytes will be overwritten
 537                          * with the padding length. */
 538                         memset(&rec->input[rec->length], 0, i);
 539                         rec->length+=i;
 540                         rec->input[l-1]=(i-1);
 541                         }
 542
 543                 if (!send)
 544                         {
 545                         if (l == 0 || l%bs != 0)
 546                                 {
 547                                 SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 548                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 549                                 return 0;
 550                                 }
 551                         /* otherwise, rec->length >= bs */
 552                         }
 553
 554                 EVP_Cipher(ds,rec->data,rec->input,l);
 555
 556                 rec->orig_len = rec->length;
 557
 558                 if (EVP_MD_CTX_md(s->read_hash) != NULL)
 559                         mac_size = EVP_MD_CTX_size(s->read_hash);
 560                 if ((bs != 1) && !send)
 561                         return ssl3_cbc_remove_padding(s, rec, bs, mac_size);
 562                 }
 563         return(1);
 564         }
 565
 566 void ssl3_init_finished_mac(SSL *s)
 567         {
 568         if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer);
 569         if (s->s3->handshake_dgst) ssl3_free_digest_list(s);
 570     s->s3->handshake_buffer=BIO_new(BIO_s_mem());
 571         (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE);
 572         }
 573
 574 void ssl3_free_digest_list(SSL *s)
 575         {
 576         int i;
 577         if (!s->s3->handshake_dgst) return;
 578         for (i=0;i<SSL_MAX_DIGEST;i++)
 579                 {
 580                 if (s->s3->handshake_dgst[i])
 581                         EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]);
 582                 }
 583         OPENSSL_free(s->s3->handshake_dgst);
 584         s->s3->handshake_dgst=NULL;
 585         }
 586
 587
 588
 589 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 590         {
 591         if (s->s3->handshake_buffer && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE))
 592                 {
 593                 BIO_write (s->s3->handshake_buffer,(void *)buf,len);
 594                 }
 595         else
 596                 {
 597                 int i;
 598                 for (i=0;i< SSL_MAX_DIGEST;i++)
 599                         {
 600                         if (s->s3->handshake_dgst[i]!= NULL)
 601                         EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len);
 602                         }
 603                 }
 604         }
 605
 606 int ssl3_digest_cached_records(SSL *s)
 607         {
 608         int i;
 609         long mask;
 610         const EVP_MD *md;
 611         long hdatalen;
 612         void *hdata;
 613
 614         /* Allocate handshake_dgst array */
 615         ssl3_free_digest_list(s);
 616         s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *));
 617         memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *));
 618         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata);
 619         if (hdatalen <= 0)
 620                 {
 621                 SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH);
 622                 return 0;
 623                 }
 624
 625         /* Loop through bitso of algorithm2 field and create MD_CTX-es */
 626         for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++)
 627                 {
 628                 if ((mask & ssl_get_algorithm2(s)) && md)
 629                         {
 630                         s->s3->handshake_dgst[i]=EVP_MD_CTX_create();
 631 #ifdef OPENSSL_FIPS
 632                         if (EVP_MD_nid(md) == NID_md5)
 633                                 {
 634                                 EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i],
 635                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 636                                 }
 637 #endif
 638                         EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL);
 639                         EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen);
 640                         }
 641                 else
 642                         {
 643                         s->s3->handshake_dgst[i]=NULL;
 644                         }
 645                 }
 646         if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE))
 647                 {
 648                 /* Free handshake_buffer BIO */
 649                 BIO_free(s->s3->handshake_buffer);
 650                 s->s3->handshake_buffer = NULL;
 651                 }
 652
 653         return 1;
 654         }
 655
 656 int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p)
 657         {
 658         return(ssl3_handshake_mac(s,md_nid,NULL,0,p));
 659         }
 660 int ssl3_final_finish_mac(SSL *s,
 661              const char *sender, int len, unsigned char *p)
 662         {
 663         int ret;
 664         ret=ssl3_handshake_mac(s,NID_md5,sender,len,p);
 665         p+=ret;
 666         ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p);
 667         return(ret);
 668         }
 669 static int ssl3_handshake_mac(SSL *s, int md_nid,
 670              const char *sender, int len, unsigned char *p)
 671         {
 672         unsigned int ret;
 673         int npad,n;
 674         unsigned int i;
 675         unsigned char md_buf[EVP_MAX_MD_SIZE];
 676         EVP_MD_CTX ctx,*d=NULL;
 677
 678         if (s->s3->handshake_buffer)
 679                 if (!ssl3_digest_cached_records(s))
 680                         return 0;
 681
 682         /* Search for digest of specified type in the handshake_dgst
 683          * array*/
 684         for (i=0;i<SSL_MAX_DIGEST;i++)
 685                 {
 686                   if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
 687                         {
 688                         d=s->s3->handshake_dgst[i];
 689                         break;
 690                         }
 691                 }
 692         if (!d) {
 693                 SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST);
 694                 return 0;
 695         }
 696         EVP_MD_CTX_init(&ctx);
 697         EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 698         EVP_MD_CTX_copy_ex(&ctx,d);
 699         n=EVP_MD_CTX_size(&ctx);
 700         if (n < 0)
 701                 return 0;
 702
 703         npad=(48/n)*n;
 704         if (sender != NULL)
 705                 EVP_DigestUpdate(&ctx,sender,len);
 706         EVP_DigestUpdate(&ctx,s->session->master_key,
 707                 s->session->master_key_length);
 708         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 709         EVP_DigestFinal_ex(&ctx,md_buf,&i);
 710
 711         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
 712         EVP_DigestUpdate(&ctx,s->session->master_key,
 713                 s->session->master_key_length);
 714         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 715         EVP_DigestUpdate(&ctx,md_buf,i);
 716         EVP_DigestFinal_ex(&ctx,p,&ret);
 717
 718         EVP_MD_CTX_cleanup(&ctx);
 719
 720         return((int)ret);
 721         }
 722
 723 int n_ssl3_mac(SSL *ssl, unsigned char *md, int send)
 724         {
 725         SSL3_RECORD *rec;
 726         unsigned char *mac_sec,*seq;
 727         EVP_MD_CTX md_ctx;
 728         const EVP_MD_CTX *hash;
 729         unsigned char *p,rec_char;
 730         size_t md_size;
 731         int npad;
 732         int t;
 733
 734         if (send)
 735                 {
 736                 rec= &(ssl->s3->wrec);
 737                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 738                 seq= &(ssl->s3->write_sequence[0]);
 739                 hash=ssl->write_hash;
 740                 }
 741         else
 742                 {
 743                 rec= &(ssl->s3->rrec);
 744                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 745                 seq= &(ssl->s3->read_sequence[0]);
 746                 hash=ssl->read_hash;
 747                 }
 748
 749         t=EVP_MD_CTX_size(hash);
 750         if (t < 0)
 751                 return -1;
 752         md_size=t;
 753         npad=(48/md_size)*md_size;
 754
 755         if (!send &&
 756             EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
 757             ssl3_cbc_record_digest_supported(hash))
 758                 {
 759                 /* This is a CBC-encrypted record. We must avoid leaking any
 760                  * timing-side channel information about how many blocks of
 761                  * data we are hashing because that gives an attacker a
 762                  * timing-oracle. */
 763
 764                 /* npad is, at most, 48 bytes and that's with MD5:
 765                  *   16 + 48 + 8 (sequence bytes) + 1 + 2 = 75.
 766                  *
 767                  * With SHA-1 (the largest hash speced for SSLv3) the hash size
 768                  * goes up 4, but npad goes down by 8, resulting in a smaller
 769                  * total size. */
 770                 unsigned char header[75];
 771                 unsigned j = 0;
 772                 memcpy(header+j, mac_sec, md_size);
 773                 j += md_size;
 774                 memcpy(header+j, ssl3_pad_1, npad);
 775                 j += npad;
 776                 memcpy(header+j, seq, 8);
 777                 j += 8;
 778                 header[j++] = rec->type;
 779                 header[j++] = rec->length >> 8;
 780                 header[j++] = rec->length & 0xff;
 781
 782                 ssl3_cbc_digest_record(
 783                         hash,
 784                         md, &md_size,
 785                         header, rec->input,
 786                         rec->length + md_size, rec->orig_len,
 787                         mac_sec, md_size,
 788                         1 /* is SSLv3 */);
 789                 }
 790         else
 791                 {
 792                 unsigned int md_size_u;
 793                 /* Chop the digest off the end :-) */
 794                 EVP_MD_CTX_init(&md_ctx);
 795
 796                 EVP_MD_CTX_copy_ex( &md_ctx,hash);
 797                 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 798                 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 799                 EVP_DigestUpdate(&md_ctx,seq,8);
 800                 rec_char=rec->type;
 801                 EVP_DigestUpdate(&md_ctx,&rec_char,1);
 802                 p=md;
 803                 s2n(rec->length,p);
 804                 EVP_DigestUpdate(&md_ctx,md,2);
 805                 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 806                 EVP_DigestFinal_ex( &md_ctx,md,NULL);
 807
 808                 EVP_MD_CTX_copy_ex( &md_ctx,hash);
 809                 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 810                 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 811                 EVP_DigestUpdate(&md_ctx,md,md_size);
 812                 EVP_DigestFinal_ex( &md_ctx,md,&md_size_u);
 813                 md_size = md_size_u;
 814
 815                 EVP_MD_CTX_cleanup(&md_ctx);
 816         }
 817
 818         ssl3_record_sequence_update(seq);
 819         return(md_size);
 820         }
 821
 822 void ssl3_record_sequence_update(unsigned char *seq)
 823         {
 824         int i;
 825
 826         for (i=7; i>=0; i--)
 827                 {
 828                 ++seq[i];
 829                 if (seq[i] != 0) break;
 830                 }
 831         }
 832
 833 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 834              int len)
 835         {
 836         static const unsigned char *salt[3]={
 837 #ifndef CHARSET_EBCDIC
 838                 (const unsigned char *)"A",
 839                 (const unsigned char *)"BB",
 840                 (const unsigned char *)"CCC",
 841 #else
 842                 (const unsigned char *)"\x41",
 843                 (const unsigned char *)"\x42\x42",
 844                 (const unsigned char *)"\x43\x43\x43",
 845 #endif
 846                 };
 847         unsigned char buf[EVP_MAX_MD_SIZE];
 848         EVP_MD_CTX ctx;
 849         int i,ret=0;
 850         unsigned int n;
 851 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 852         unsigned char *tmpout = out;
 853 #endif
 854
 855         EVP_MD_CTX_init(&ctx);
 856         for (i=0; i<3; i++)
 857                 {
 858                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
 859                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 860                 EVP_DigestUpdate(&ctx,p,len);
 861                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 862                         SSL3_RANDOM_SIZE);
 863                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 864                         SSL3_RANDOM_SIZE);
 865                 EVP_DigestFinal_ex(&ctx,buf,&n);
 866
 867                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
 868                 EVP_DigestUpdate(&ctx,p,len);
 869                 EVP_DigestUpdate(&ctx,buf,n);
 870                 EVP_DigestFinal_ex(&ctx,out,&n);
 871                 out+=n;
 872                 ret+=n;
 873                 }
 874         EVP_MD_CTX_cleanup(&ctx);
 875
 876 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 877         if (s->msg_callback)
 878                 {
 879                 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER,
 880                                                 p, len, s, s->msg_callback_arg);
 881                 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM,
 882                                         s->s3->client_random, SSL3_RANDOM_SIZE,
 883                                                 s, s->msg_callback_arg);
 884                 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM,
 885                                         s->s3->server_random, SSL3_RANDOM_SIZE,
 886                                         s, s->msg_callback_arg);
 887                 s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER,
 888                                         tmpout, SSL3_MASTER_SECRET_SIZE,
 889                                         s, s->msg_callback_arg);
 890                 }
 891 #endif
 892         return(ret);
 893         }
 894
 895 int ssl3_alert_code(int code)
 896         {
 897         switch (code)
 898                 {
 899         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 900         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 901         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 902         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 903         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 904         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 905         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 906         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 907         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 908         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 909         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 910         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 911         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 912         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 913         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 914         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 915         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 916         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 917         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 918         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 919         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 920         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 921         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 922         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 923         case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
 924         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
 925         case SSL_AD_UNRECOGNIZED_NAME:  return(SSL3_AD_HANDSHAKE_FAILURE);
 926         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
 927         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
 928         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 929         default:                        return(-1);
 930                 }
 931         }
 932