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) 1998-2002 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 #include <stdio.h>
 113 #include "ssl_locl.h"
 114 #include <openssl/evp.h>
 115 #include <openssl/md5.h>
 116
 117 static unsigned char ssl3_pad_1[48]={
 118         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 119         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 120         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 121         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 122         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36,
 123         0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 };
 124
 125 static unsigned char ssl3_pad_2[48]={
 126         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 127         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 128         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 129         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 130         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,
 131         0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c };
 132
 133 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 134         const char *sender, int len, unsigned char *p);
 135
 136 static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
 137         {
 138         EVP_MD_CTX m5;
 139         EVP_MD_CTX s1;
 140         unsigned char buf[16],smd[SHA_DIGEST_LENGTH];
 141         unsigned char c='A';
 142         unsigned int i,j,k;
 143
 144 #ifdef CHARSET_EBCDIC
 145         c = os_toascii[c]; /*'A' in ASCII */
 146 #endif
 147         k=0;
 148         EVP_MD_CTX_init(&m5);
 149         EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 150         EVP_MD_CTX_init(&s1);
 151         for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH)
 152                 {
 153                 k++;
 154                 if (k > sizeof buf)
 155                         {
 156                         /* bug: 'buf' is too small for this ciphersuite */
 157                         SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
 158                         return 0;
 159                         }
 160
 161                 for (j=0; j<k; j++)
 162                         buf[j]=c;
 163                 c++;
 164                 EVP_DigestInit_ex(&s1,EVP_sha1(), NULL);
 165                 EVP_DigestUpdate(&s1,buf,k);
 166                 EVP_DigestUpdate(&s1,s->session->master_key,
 167                         s->session->master_key_length);
 168                 EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE);
 169                 EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE);
 170                 EVP_DigestFinal_ex(&s1,smd,NULL);
 171
 172                 EVP_DigestInit_ex(&m5,EVP_md5(), NULL);
 173                 EVP_DigestUpdate(&m5,s->session->master_key,
 174                         s->session->master_key_length);
 175                 EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH);
 176                 if ((int)(i+MD5_DIGEST_LENGTH) > num)
 177                         {
 178                         EVP_DigestFinal_ex(&m5,smd,NULL);
 179                         memcpy(km,smd,(num-i));
 180                         }
 181                 else
 182                         EVP_DigestFinal_ex(&m5,km,NULL);
 183
 184                 km+=MD5_DIGEST_LENGTH;
 185                 }
 186         OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH);
 187         EVP_MD_CTX_cleanup(&m5);
 188         EVP_MD_CTX_cleanup(&s1);
 189         return 1;
 190         }
 191
 192 int ssl3_change_cipher_state(SSL *s, int which)
 193         {
 194         unsigned char *p,*mac_secret;
 195         unsigned char exp_key[EVP_MAX_KEY_LENGTH];
 196         unsigned char exp_iv[EVP_MAX_IV_LENGTH];
 197         unsigned char *ms,*key,*iv,*er1,*er2;
 198         EVP_CIPHER_CTX *dd;
 199         const EVP_CIPHER *c;
 200 #ifndef OPENSSL_NO_COMP
 201         COMP_METHOD *comp;
 202 #endif
 203         const EVP_MD *m;
 204         EVP_MD_CTX md;
 205         int is_exp,n,i,j,k,cl;
 206         int reuse_dd = 0;
 207
 208         is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 209         c=s->s3->tmp.new_sym_enc;
 210         m=s->s3->tmp.new_hash;
 211 #ifndef OPENSSL_NO_COMP
 212         if (s->s3->tmp.new_compression == NULL)
 213                 comp=NULL;
 214         else
 215                 comp=s->s3->tmp.new_compression->method;
 216 #endif
 217
 218         if (which & SSL3_CC_READ)
 219                 {
 220                 if (s->enc_read_ctx != NULL)
 221                         reuse_dd = 1;
 222                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 223                         goto err;
 224                 else
 225                         /* make sure it's intialized in case we exit later with an error */
 226                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 227                 dd= s->enc_read_ctx;
 228                 s->read_hash=m;
 229 #ifndef OPENSSL_NO_COMP
 230                 /* COMPRESS */
 231                 if (s->expand != NULL)
 232                         {
 233                         COMP_CTX_free(s->expand);
 234                         s->expand=NULL;
 235                         }
 236                 if (comp != NULL)
 237                         {
 238                         s->expand=COMP_CTX_new(comp);
 239                         if (s->expand == NULL)
 240                                 {
 241                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 242                                 goto err2;
 243                                 }
 244                         if (s->s3->rrec.comp == NULL)
 245                                 s->s3->rrec.comp=(unsigned char *)
 246                                         OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
 247                         if (s->s3->rrec.comp == NULL)
 248                                 goto err;
 249                         }
 250 #endif
 251                 memset(&(s->s3->read_sequence[0]),0,8);
 252                 mac_secret= &(s->s3->read_mac_secret[0]);
 253                 }
 254         else
 255                 {
 256                 if (s->enc_write_ctx != NULL)
 257                         reuse_dd = 1;
 258                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 259                         goto err;
 260                 else
 261                         /* make sure it's intialized in case we exit later with an error */
 262                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 263                 dd= s->enc_write_ctx;
 264                 s->write_hash=m;
 265 #ifndef OPENSSL_NO_COMP
 266                 /* COMPRESS */
 267                 if (s->compress != NULL)
 268                         {
 269                         COMP_CTX_free(s->compress);
 270                         s->compress=NULL;
 271                         }
 272                 if (comp != NULL)
 273                         {
 274                         s->compress=COMP_CTX_new(comp);
 275                         if (s->compress == NULL)
 276                                 {
 277                                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 278                                 goto err2;
 279                                 }
 280                         }
 281 #endif
 282                 memset(&(s->s3->write_sequence[0]),0,8);
 283                 mac_secret= &(s->s3->write_mac_secret[0]);
 284                 }
 285
 286         if (reuse_dd)
 287                 EVP_CIPHER_CTX_cleanup(dd);
 288
 289         p=s->s3->tmp.key_block;
 290         i=EVP_MD_size(m);
 291         cl=EVP_CIPHER_key_length(c);
 292         j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 293                  cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 294         /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
 295         k=EVP_CIPHER_iv_length(c);
 296         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 297                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 298                 {
 299                 ms=  &(p[ 0]); n=i+i;
 300                 key= &(p[ n]); n+=j+j;
 301                 iv=  &(p[ n]); n+=k+k;
 302                 er1= &(s->s3->client_random[0]);
 303                 er2= &(s->s3->server_random[0]);
 304                 }
 305         else
 306                 {
 307                 n=i;
 308                 ms=  &(p[ n]); n+=i+j;
 309                 key= &(p[ n]); n+=j+k;
 310                 iv=  &(p[ n]); n+=k;
 311                 er1= &(s->s3->server_random[0]);
 312                 er2= &(s->s3->client_random[0]);
 313                 }
 314
 315         if (n > s->s3->tmp.key_block_length)
 316                 {
 317                 SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 318                 goto err2;
 319                 }
 320
 321         EVP_MD_CTX_init(&md);
 322         memcpy(mac_secret,ms,i);
 323         if (is_exp)
 324                 {
 325                 /* In here I set both the read and write key/iv to the
 326                  * same value since only the correct one will be used :-).
 327                  */
 328                 EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 329                 EVP_DigestUpdate(&md,key,j);
 330                 EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 331                 EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 332                 EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL);
 333                 key= &(exp_key[0]);
 334
 335                 if (k > 0)
 336                         {
 337                         EVP_DigestInit_ex(&md,EVP_md5(), NULL);
 338                         EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE);
 339                         EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE);
 340                         EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL);
 341                         iv= &(exp_iv[0]);
 342                         }
 343                 }
 344
 345         s->session->key_arg_length=0;
 346
 347         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 348
 349         OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key));
 350         OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv));
 351         EVP_MD_CTX_cleanup(&md);
 352         return(1);
 353 err:
 354         SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 355 err2:
 356         return(0);
 357         }
 358
 359 int ssl3_setup_key_block(SSL *s)
 360         {
 361         unsigned char *p;
 362         const EVP_CIPHER *c;
 363         const EVP_MD *hash;
 364         int num;
 365         int ret = 0;
 366         SSL_COMP *comp;
 367
 368         if (s->s3->tmp.key_block_length != 0)
 369                 return(1);
 370
 371         if (!ssl_cipher_get_evp(s->session,&c,&hash,&comp))
 372                 {
 373                 SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 374                 return(0);
 375                 }
 376
 377         s->s3->tmp.new_sym_enc=c;
 378         s->s3->tmp.new_hash=hash;
 379 #ifdef OPENSSL_NO_COMP
 380         s->s3->tmp.new_compression=NULL;
 381 #else
 382         s->s3->tmp.new_compression=comp;
 383 #endif
 384
 385         num=EVP_CIPHER_key_length(c)+EVP_MD_size(hash)+EVP_CIPHER_iv_length(c);
 386         num*=2;
 387
 388         ssl3_cleanup_key_block(s);
 389
 390         if ((p=OPENSSL_malloc(num)) == NULL)
 391                 goto err;
 392
 393         s->s3->tmp.key_block_length=num;
 394         s->s3->tmp.key_block=p;
 395
 396         ret = ssl3_generate_key_block(s,p,num);
 397
 398         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 399                 {
 400                 /* enable vulnerability countermeasure for CBC ciphers with
 401                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 402                  */
 403                 s->s3->need_empty_fragments = 1;
 404
 405                 if (s->session->cipher != NULL)
 406                         {
 407                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_eNULL)
 408                                 s->s3->need_empty_fragments = 0;
 409
 410 #ifndef OPENSSL_NO_RC4
 411                         if ((s->session->cipher->algorithms & SSL_ENC_MASK) == SSL_RC4)
 412                                 s->s3->need_empty_fragments = 0;
 413 #endif
 414                         }
 415                 }
 416
 417         return ret;
 418
 419 err:
 420         SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 421         return(0);
 422         }
 423
 424 void ssl3_cleanup_key_block(SSL *s)
 425         {
 426         if (s->s3->tmp.key_block != NULL)
 427                 {
 428                 OPENSSL_cleanse(s->s3->tmp.key_block,
 429                         s->s3->tmp.key_block_length);
 430                 OPENSSL_free(s->s3->tmp.key_block);
 431                 s->s3->tmp.key_block=NULL;
 432                 }
 433         s->s3->tmp.key_block_length=0;
 434         }
 435
 436 /* ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively.
 437  *
 438  * Returns:
 439  *   0: (in non-constant time) if the record is publically invalid (i.e. too
 440  *       short etc).
 441  *   1: if the record's padding is valid / the encryption was successful.
 442  *   -1: if the record's padding is invalid or, if sending, an internal error
 443  *       occured.
 444  */
 445 int ssl3_enc(SSL *s, int send)
 446         {
 447         SSL3_RECORD *rec;
 448         EVP_CIPHER_CTX *ds;
 449         unsigned long l;
 450         int bs,i,mac_size=0;
 451         const EVP_CIPHER *enc;
 452
 453         if (send)
 454                 {
 455                 ds=s->enc_write_ctx;
 456                 rec= &(s->s3->wrec);
 457                 if (s->enc_write_ctx == NULL)
 458                         enc=NULL;
 459                 else
 460                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 461                 }
 462         else
 463                 {
 464                 ds=s->enc_read_ctx;
 465                 rec= &(s->s3->rrec);
 466                 if (s->enc_read_ctx == NULL)
 467                         enc=NULL;
 468                 else
 469                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 470                 }
 471
 472         if ((s->session == NULL) || (ds == NULL) ||
 473                 (enc == NULL))
 474                 {
 475                 memmove(rec->data,rec->input,rec->length);
 476                 rec->input=rec->data;
 477                 }
 478         else
 479                 {
 480                 l=rec->length;
 481                 bs=EVP_CIPHER_block_size(ds->cipher);
 482
 483                 /* COMPRESS */
 484
 485                 if ((bs != 1) && send)
 486                         {
 487                         i=bs-((int)l%bs);
 488
 489                         /* we need to add 'i-1' padding bytes */
 490                         l+=i;
 491                         /* the last of these zero bytes will be overwritten
 492                          * with the padding length. */
 493                         memset(&rec->input[rec->length], 0, i);
 494                         rec->length+=i;
 495                         rec->input[l-1]=(i-1);
 496                         }
 497
 498                 if (!send)
 499                         {
 500                         if (l == 0 || l%bs != 0)
 501                                 return 0;
 502                         /* otherwise, rec->length >= bs */
 503                         }
 504
 505                 EVP_Cipher(ds,rec->data,rec->input,l);
 506
 507                 if (s->read_hash != NULL)
 508                         mac_size = EVP_MD_size(s->read_hash);
 509
 510                 if ((bs != 1) && !send)
 511                         return ssl3_cbc_remove_padding(s, rec, bs, mac_size);
 512                 }
 513         return(1);
 514         }
 515
 516 void ssl3_init_finished_mac(SSL *s)
 517         {
 518         EVP_MD_CTX_set_flags(&(s->s3->finish_dgst1),
 519                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 520         EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);
 521         EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);
 522         }
 523
 524 void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
 525         {
 526         EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
 527         EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
 528         }
 529
 530 int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
 531         {
 532         return(ssl3_handshake_mac(s,ctx,NULL,0,p));
 533         }
 534
 535 int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
 536              const char *sender, int len, unsigned char *p)
 537         {
 538         int ret;
 539
 540         ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
 541         p+=ret;
 542         ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
 543         return(ret);
 544         }
 545
 546 static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
 547              const char *sender, int len, unsigned char *p)
 548         {
 549         unsigned int ret;
 550         int npad,n;
 551         unsigned int i;
 552         unsigned char md_buf[EVP_MAX_MD_SIZE];
 553         EVP_MD_CTX ctx;
 554
 555         EVP_MD_CTX_init(&ctx);
 556         EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
 557         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 558
 559         n=EVP_MD_CTX_size(&ctx);
 560         npad=(48/n)*n;
 561
 562         if (sender != NULL)
 563                 EVP_DigestUpdate(&ctx,sender,len);
 564         EVP_DigestUpdate(&ctx,s->session->master_key,
 565                 s->session->master_key_length);
 566         EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
 567         EVP_DigestFinal_ex(&ctx,md_buf,&i);
 568
 569         EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
 570         EVP_DigestUpdate(&ctx,s->session->master_key,
 571                 s->session->master_key_length);
 572         EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
 573         EVP_DigestUpdate(&ctx,md_buf,i);
 574         EVP_DigestFinal_ex(&ctx,p,&ret);
 575
 576         EVP_MD_CTX_cleanup(&ctx);
 577
 578         return((int)ret);
 579         }
 580
 581 int ssl3_mac(SSL *ssl, unsigned char *md, int send)
 582         {
 583         SSL3_RECORD *rec;
 584         unsigned char *mac_sec,*seq;
 585         EVP_MD_CTX md_ctx;
 586         const EVP_MD *hash;
 587         unsigned char *p,rec_char;
 588         size_t md_size, orig_len;
 589         int npad;
 590
 591         if (send)
 592                 {
 593                 rec= &(ssl->s3->wrec);
 594                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 595                 seq= &(ssl->s3->write_sequence[0]);
 596                 hash=ssl->write_hash;
 597                 }
 598         else
 599                 {
 600                 rec= &(ssl->s3->rrec);
 601                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 602                 seq= &(ssl->s3->read_sequence[0]);
 603                 hash=ssl->read_hash;
 604                 }
 605
 606         md_size=EVP_MD_size(hash);
 607         npad=(48/md_size)*md_size;
 608
 609         /* kludge: ssl3_cbc_remove_padding passes padding length in rec->type */
 610         orig_len = rec->length+md_size+((unsigned int)rec->type>>8);
 611         rec->type &= 0xff;
 612
 613         if (!send &&
 614             EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE &&
 615             ssl3_cbc_record_digest_supported(hash))
 616                 {
 617                 /* This is a CBC-encrypted record. We must avoid leaking any
 618                  * timing-side channel information about how many blocks of
 619                  * data we are hashing because that gives an attacker a
 620                  * timing-oracle. */
 621
 622                 /* npad is, at most, 48 bytes and that's with MD5:
 623                  *   16 + 48 + 8 (sequence bytes) + 1 + 2 = 75.
 624                  *
 625                  * With SHA-1 (the largest hash speced for SSLv3) the hash size
 626                  * goes up 4, but npad goes down by 8, resulting in a smaller
 627                  * total size. */
 628                 unsigned char header[75];
 629                 unsigned j = 0;
 630                 memcpy(header+j, mac_sec, md_size);
 631                 j += md_size;
 632                 memcpy(header+j, ssl3_pad_1, npad);
 633                 j += npad;
 634                 memcpy(header+j, seq, 8);
 635                 j += 8;
 636                 header[j++] = rec->type;
 637                 header[j++] = rec->length >> 8;
 638                 header[j++] = rec->length & 0xff;
 639
 640                 ssl3_cbc_digest_record(
 641                         hash,
 642                         md, &md_size,
 643                         header, rec->input,
 644                         rec->length + md_size, orig_len,
 645                         mac_sec, md_size,
 646                         1 /* is SSLv3 */);
 647                 }
 648         else
 649                 {
 650                 unsigned int md_size_u;
 651                 /* Chop the digest off the end :-) */
 652                 EVP_MD_CTX_init(&md_ctx);
 653
 654                 EVP_DigestInit_ex( &md_ctx,hash, NULL);
 655                 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 656                 EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
 657                 EVP_DigestUpdate(&md_ctx,seq,8);
 658                 rec_char=rec->type;
 659                 EVP_DigestUpdate(&md_ctx,&rec_char,1);
 660                 p=md;
 661                 s2n(rec->length,p);
 662                 EVP_DigestUpdate(&md_ctx,md,2);
 663                 EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
 664                 EVP_DigestFinal_ex( &md_ctx,md,NULL);
 665
 666                 EVP_DigestInit_ex( &md_ctx,hash, NULL);
 667                 EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
 668                 EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
 669                 EVP_DigestUpdate(&md_ctx,md,md_size);
 670                 EVP_DigestFinal_ex( &md_ctx,md,&md_size_u);
 671                 md_size = md_size_u;
 672
 673                 EVP_MD_CTX_cleanup(&md_ctx);
 674         }
 675
 676         ssl3_record_sequence_update(seq);
 677         return(md_size);
 678         }
 679
 680 void ssl3_record_sequence_update(unsigned char *seq)
 681         {
 682         int i;
 683
 684         for (i=7; i>=0; i--)
 685                 {
 686                 ++seq[i];
 687                 if (seq[i] != 0) break;
 688                 }
 689         }
 690
 691 int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 692              int len)
 693         {
 694         static const unsigned char *salt[3]={
 695 #ifndef CHARSET_EBCDIC
 696                 (const unsigned char *)"A",
 697                 (const unsigned char *)"BB",
 698                 (const unsigned char *)"CCC",
 699 #else
 700                 (const unsigned char *)"\x41",
 701                 (const unsigned char *)"\x42\x42",
 702                 (const unsigned char *)"\x43\x43\x43",
 703 #endif
 704                 };
 705         unsigned char buf[EVP_MAX_MD_SIZE];
 706         EVP_MD_CTX ctx;
 707         int i,ret=0;
 708         unsigned int n;
 709
 710         EVP_MD_CTX_init(&ctx);
 711         for (i=0; i<3; i++)
 712                 {
 713                 EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL);
 714                 EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i]));
 715                 EVP_DigestUpdate(&ctx,p,len);
 716                 EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]),
 717                         SSL3_RANDOM_SIZE);
 718                 EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]),
 719                         SSL3_RANDOM_SIZE);
 720                 EVP_DigestFinal_ex(&ctx,buf,&n);
 721
 722                 EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL);
 723                 EVP_DigestUpdate(&ctx,p,len);
 724                 EVP_DigestUpdate(&ctx,buf,n);
 725                 EVP_DigestFinal_ex(&ctx,out,&n);
 726                 out+=n;
 727                 ret+=n;
 728                 }
 729         EVP_MD_CTX_cleanup(&ctx);
 730         return(ret);
 731         }
 732
 733 int ssl3_alert_code(int code)
 734         {
 735         switch (code)
 736                 {
 737         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 738         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 739         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 740         case SSL_AD_DECRYPTION_FAILED:  return(SSL3_AD_BAD_RECORD_MAC);
 741         case SSL_AD_RECORD_OVERFLOW:    return(SSL3_AD_BAD_RECORD_MAC);
 742         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 743         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 744         case SSL_AD_NO_CERTIFICATE:     return(SSL3_AD_NO_CERTIFICATE);
 745         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 746         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 747         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 748         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 749         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 750         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 751         case SSL_AD_UNKNOWN_CA:         return(SSL3_AD_BAD_CERTIFICATE);
 752         case SSL_AD_ACCESS_DENIED:      return(SSL3_AD_HANDSHAKE_FAILURE);
 753         case SSL_AD_DECODE_ERROR:       return(SSL3_AD_HANDSHAKE_FAILURE);
 754         case SSL_AD_DECRYPT_ERROR:      return(SSL3_AD_HANDSHAKE_FAILURE);
 755         case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE);
 756         case SSL_AD_PROTOCOL_VERSION:   return(SSL3_AD_HANDSHAKE_FAILURE);
 757         case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE);
 758         case SSL_AD_INTERNAL_ERROR:     return(SSL3_AD_HANDSHAKE_FAILURE);
 759         case SSL_AD_USER_CANCELLED:     return(SSL3_AD_HANDSHAKE_FAILURE);
 760         case SSL_AD_NO_RENEGOTIATION:   return(-1); /* Don't send it :-) */
 761         case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE);
 762         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE);
 763         case SSL_AD_UNRECOGNIZED_NAME:  return(SSL3_AD_HANDSHAKE_FAILURE);
 764         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE);
 765         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE);
 766         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 767         default:                        return(-1);
 768                 }
 769         }
 770