ssl/t1_enc.c

   1 /* ssl/t1_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/comp.h>
 141 #include <openssl/evp.h>
 142 #include <openssl/hmac.h>
 143 #include <openssl/md5.h>
 144
 145 /* seed1 through seed5 are virtually concatenated */
 146 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 147                         int sec_len,
 148                         const void *seed1, int seed1_len,
 149                         const void *seed2, int seed2_len,
 150                         const void *seed3, int seed3_len,
 151                         const void *seed4, int seed4_len,
 152                         const void *seed5, int seed5_len,
 153                         unsigned char *out, int olen)
 154         {
 155         int chunk,n;
 156         unsigned int j;
 157         HMAC_CTX ctx;
 158         HMAC_CTX ctx_tmp;
 159         unsigned char A1[EVP_MAX_MD_SIZE];
 160         unsigned int A1_len;
 161
 162         chunk=EVP_MD_size(md);
 163
 164         HMAC_CTX_init(&ctx);
 165         HMAC_CTX_init(&ctx_tmp);
 166         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
 167         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
 168         if (seed1 != NULL) HMAC_Update(&ctx,seed1,seed1_len);
 169         if (seed2 != NULL) HMAC_Update(&ctx,seed2,seed2_len);
 170         if (seed3 != NULL) HMAC_Update(&ctx,seed3,seed3_len);
 171         if (seed4 != NULL) HMAC_Update(&ctx,seed4,seed4_len);
 172         if (seed5 != NULL) HMAC_Update(&ctx,seed5,seed5_len);
 173         HMAC_Final(&ctx,A1,&A1_len);
 174
 175         n=0;
 176         for (;;)
 177                 {
 178                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
 179                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
 180                 HMAC_Update(&ctx,A1,A1_len);
 181                 HMAC_Update(&ctx_tmp,A1,A1_len);
 182                 if (seed1 != NULL) HMAC_Update(&ctx,seed1,seed1_len);
 183                 if (seed2 != NULL) HMAC_Update(&ctx,seed2,seed2_len);
 184                 if (seed3 != NULL) HMAC_Update(&ctx,seed3,seed3_len);
 185                 if (seed4 != NULL) HMAC_Update(&ctx,seed4,seed4_len);
 186                 if (seed5 != NULL) HMAC_Update(&ctx,seed5,seed5_len);
 187
 188                 if (olen > chunk)
 189                         {
 190                         HMAC_Final(&ctx,out,&j);
 191                         out+=j;
 192                         olen-=j;
 193                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 194                         }
 195                 else    /* last one */
 196                         {
 197                         HMAC_Final(&ctx,A1,&A1_len);
 198                         memcpy(out,A1,olen);
 199                         break;
 200                         }
 201                 }
 202         HMAC_CTX_cleanup(&ctx);
 203         HMAC_CTX_cleanup(&ctx_tmp);
 204         OPENSSL_cleanse(A1,sizeof(A1));
 205         }
 206
 207 /* seed1 through seed5 are virtually concatenated */
 208 static void tls1_PRF(long digest_mask,
 209                      const void *seed1, int seed1_len,
 210                      const void *seed2, int seed2_len,
 211                      const void *seed3, int seed3_len,
 212                      const void *seed4, int seed4_len,
 213                      const void *seed5, int seed5_len,
 214                      const unsigned char *sec, int slen,
 215                      unsigned char *out1,
 216                      unsigned char *out2, int olen)
 217         {
 218         int len,i,idx,count;
 219         const unsigned char *S1;
 220         long m;
 221         const EVP_MD *md;
 222
 223         /* Count number of digests and partition sec evenly */
 224         count=0;
 225         for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) {
 226                 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) count++;
 227         }
 228         len=slen/count;
 229         S1=sec;
 230         memset(out1,0,olen);
 231         for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) {
 232                 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) {
 233                         if (!md) {
 234                                 SSLerr(SSL_F_TLS1_PRF,
 235                                 SSL_R_UNSUPPORTED_DIGEST_TYPE);
 236                                 return;
 237                         }
 238                         tls1_P_hash(md ,S1,len+(slen&1),
 239                                     seed1,seed1_len,seed2,seed2_len,seed3,seed3_len,seed4,seed4_len,seed5,seed5_len,
 240                                     out2,olen);
 241                         S1+=len;
 242                         for (i=0; i<olen; i++)
 243                         {
 244                                 out1[i]^=out2[i];
 245                         }
 246                 }
 247         }
 248
 249 }
 250 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 251              unsigned char *tmp, int num)
 252         {
 253         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 254                  TLS_MD_KEY_EXPANSION_CONST,TLS_MD_KEY_EXPANSION_CONST_SIZE,
 255                  s->s3->server_random,SSL3_RANDOM_SIZE,
 256                  s->s3->client_random,SSL3_RANDOM_SIZE,
 257                  NULL,0,NULL,0,
 258                  s->session->master_key,s->session->master_key_length,
 259                  km,tmp,num);
 260 #ifdef KSSL_DEBUG
 261         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 262                 s->session->master_key_length);
 263         {
 264         int i;
 265         for (i=0; i < s->session->master_key_length; i++)
 266                 {
 267                 printf("%02X", s->session->master_key[i]);
 268                 }
 269         printf("\n");  }
 270 #endif    /* KSSL_DEBUG */
 271         }
 272
 273 int tls1_change_cipher_state(SSL *s, int which)
 274         {
 275         static const unsigned char empty[]="";
 276         unsigned char *p,*key_block,*mac_secret;
 277         unsigned char *exp_label;
 278         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 279         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 280         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 281         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 282         unsigned char *ms,*key,*iv,*er1,*er2;
 283         int client_write;
 284         EVP_CIPHER_CTX *dd;
 285         const EVP_CIPHER *c;
 286 #ifndef OPENSSL_NO_COMP
 287         const SSL_COMP *comp;
 288 #endif
 289         const EVP_MD *m;
 290         int mac_type;
 291         int *mac_secret_size;
 292         EVP_MD_CTX *mac_ctx;
 293         EVP_PKEY *mac_key;
 294         int is_export,n,i,j,k,exp_label_len,cl;
 295         int reuse_dd = 0;
 296
 297         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 298         c=s->s3->tmp.new_sym_enc;
 299         m=s->s3->tmp.new_hash;
 300         mac_type = s->s3->tmp.new_mac_pkey_type;
 301 #ifndef OPENSSL_NO_COMP
 302         comp=s->s3->tmp.new_compression;
 303 #endif
 304         key_block=s->s3->tmp.key_block;
 305
 306 #ifdef KSSL_DEBUG
 307         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 308         printf("\talg= %ld/%ld, comp= %p\n",
 309                s->s3->tmp.new_cipher->algorithm_mkey,
 310                s->s3->tmp.new_cipher->algorithm_auth,
 311                comp);
 312         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 313         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 314                 c->nid,c->block_size,c->key_len,c->iv_len);
 315         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 316         {
 317         int i;
 318         for (i=0; i<s->s3->tmp.key_block_length; i++)
 319                 printf("%02x", key_block[i]);  printf("\n");
 320         }
 321 #endif  /* KSSL_DEBUG */
 322
 323         if (which & SSL3_CC_READ)
 324                 {
 325                 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 326                         s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 327                         else
 328                         s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 329
 330                 if (s->enc_read_ctx != NULL)
 331                         reuse_dd = 1;
 332                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 333                         goto err;
 334                 else
 335                         /* make sure it's intialized in case we exit later with an error */
 336                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 337                 dd= s->enc_read_ctx;
 338                 mac_ctx=ssl_replace_hash(&s->read_hash,NULL);
 339 #ifndef OPENSSL_NO_COMP
 340                 if (s->expand != NULL)
 341                         {
 342                         COMP_CTX_free(s->expand);
 343                         s->expand=NULL;
 344                         }
 345                 if (comp != NULL)
 346                         {
 347                         s->expand=COMP_CTX_new(comp->method);
 348                         if (s->expand == NULL)
 349                                 {
 350                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 351                                 goto err2;
 352                                 }
 353                         if (s->s3->rrec.comp == NULL)
 354                                 s->s3->rrec.comp=(unsigned char *)
 355                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 356                         if (s->s3->rrec.comp == NULL)
 357                                 goto err;
 358                         }
 359 #endif
 360                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 361                 if (s->version != DTLS1_VERSION)
 362                         memset(&(s->s3->read_sequence[0]),0,8);
 363                 mac_secret= &(s->s3->read_mac_secret[0]);
 364                 mac_secret_size=&(s->s3->read_mac_secret_size);
 365                 }
 366         else
 367                 {
 368                 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 369                         s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 370                         else
 371                         s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 372                 if (s->enc_write_ctx != NULL)
 373                         reuse_dd = 1;
 374                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 375                         goto err;
 376                 else
 377                         /* make sure it's intialized in case we exit later with an error */
 378                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 379                 dd= s->enc_write_ctx;
 380                 mac_ctx = ssl_replace_hash(&s->write_hash,NULL);
 381 #ifndef OPENSSL_NO_COMP
 382                 if (s->compress != NULL)
 383                         {
 384                         COMP_CTX_free(s->compress);
 385                         s->compress=NULL;
 386                         }
 387                 if (comp != NULL)
 388                         {
 389                         s->compress=COMP_CTX_new(comp->method);
 390                         if (s->compress == NULL)
 391                                 {
 392                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 393                                 goto err2;
 394                                 }
 395                         }
 396 #endif
 397                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 398                 if (s->version != DTLS1_VERSION)
 399                         memset(&(s->s3->write_sequence[0]),0,8);
 400                 mac_secret= &(s->s3->write_mac_secret[0]);
 401                 mac_secret_size = &(s->s3->write_mac_secret_size);
 402                 }
 403
 404         if (reuse_dd)
 405                 EVP_CIPHER_CTX_cleanup(dd);
 406
 407         p=s->s3->tmp.key_block;
 408         i=*mac_secret_size=s->s3->tmp.new_mac_secret_size;
 409
 410         cl=EVP_CIPHER_key_length(c);
 411         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 412                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 413         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 414         k=EVP_CIPHER_iv_length(c);
 415         er1= &(s->s3->client_random[0]);
 416         er2= &(s->s3->server_random[0]);
 417         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 418                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 419                 {
 420                 ms=  &(p[ 0]); n=i+i;
 421                 key= &(p[ n]); n+=j+j;
 422                 iv=  &(p[ n]); n+=k+k;
 423                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 424                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 425                 client_write=1;
 426                 }
 427         else
 428                 {
 429                 n=i;
 430                 ms=  &(p[ n]); n+=i+j;
 431                 key= &(p[ n]); n+=j+k;
 432                 iv=  &(p[ n]); n+=k;
 433                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 434                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 435                 client_write=0;
 436                 }
 437
 438         if (n > s->s3->tmp.key_block_length)
 439                 {
 440                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 441                 goto err2;
 442                 }
 443
 444         memcpy(mac_secret,ms,i);
 445         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,
 446                         mac_secret,*mac_secret_size);
 447         EVP_DigestSignInit(mac_ctx,NULL,m,NULL,mac_key);
 448         EVP_PKEY_free(mac_key);
 449 #ifdef TLS_DEBUG
 450 printf("which = %04X\nmac key=",which);
 451 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 452 #endif
 453         if (is_export)
 454                 {
 455                 /* In here I set both the read and write key/iv to the
 456                  * same value since only the correct one will be used :-).
 457                  */
 458                 tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 459                          exp_label,exp_label_len,
 460                          s->s3->client_random,SSL3_RANDOM_SIZE,
 461                          s->s3->server_random,SSL3_RANDOM_SIZE,
 462                          NULL,0,NULL,0,
 463                          key,j,tmp1,tmp2,EVP_CIPHER_key_length(c));
 464                 key=tmp1;
 465
 466                 if (k > 0)
 467                         {
 468                         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 469                                  TLS_MD_IV_BLOCK_CONST,TLS_MD_IV_BLOCK_CONST_SIZE,
 470                                  s->s3->client_random,SSL3_RANDOM_SIZE,
 471                                  s->s3->server_random,SSL3_RANDOM_SIZE,
 472                                  NULL,0,NULL,0,
 473                                  empty,0,iv1,iv2,k*2);
 474                         if (client_write)
 475                                 iv=iv1;
 476                         else
 477                                 iv= &(iv1[k]);
 478                         }
 479                 }
 480
 481         s->session->key_arg_length=0;
 482 #ifdef KSSL_DEBUG
 483         {
 484         int i;
 485         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 486         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 487         printf("\n");
 488         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 489         printf("\n");
 490         }
 491 #endif  /* KSSL_DEBUG */
 492
 493         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 494 #ifdef TLS_DEBUG
 495 printf("which = %04X\nkey=",which);
 496 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 497 printf("\niv=");
 498 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 499 printf("\n");
 500 #endif
 501
 502         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 503         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 504         OPENSSL_cleanse(iv1,sizeof(iv1));
 505         OPENSSL_cleanse(iv2,sizeof(iv2));
 506         return(1);
 507 err:
 508         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 509 err2:
 510         return(0);
 511         }
 512
 513 int tls1_setup_key_block(SSL *s)
 514         {
 515         unsigned char *p1,*p2;
 516         const EVP_CIPHER *c;
 517         const EVP_MD *hash;
 518         int num;
 519         SSL_COMP *comp;
 520         int mac_type= NID_undef,mac_secret_size=0;
 521
 522 #ifdef KSSL_DEBUG
 523         printf ("tls1_setup_key_block()\n");
 524 #endif  /* KSSL_DEBUG */
 525
 526         if (s->s3->tmp.key_block_length != 0)
 527                 return(1);
 528
 529         if (!ssl_cipher_get_evp(s->session,&c,&hash,&mac_type,&mac_secret_size,&comp))
 530                 {
 531                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 532                 return(0);
 533                 }
 534
 535         s->s3->tmp.new_sym_enc=c;
 536         s->s3->tmp.new_hash=hash;
 537         s->s3->tmp.new_mac_pkey_type = mac_type;
 538         s->s3->tmp.new_mac_secret_size = mac_secret_size;
 539         num=EVP_CIPHER_key_length(c)+mac_secret_size+EVP_CIPHER_iv_length(c);
 540         num*=2;
 541
 542         ssl3_cleanup_key_block(s);
 543
 544         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 545                 goto err;
 546         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 547                 goto err;
 548
 549         s->s3->tmp.key_block_length=num;
 550         s->s3->tmp.key_block=p1;
 551
 552
 553 #ifdef TLS_DEBUG
 554 printf("client random\n");
 555 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 556 printf("server random\n");
 557 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 558 printf("pre-master\n");
 559 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 560 #endif
 561         tls1_generate_key_block(s,p1,p2,num);
 562         OPENSSL_cleanse(p2,num);
 563         OPENSSL_free(p2);
 564 #ifdef TLS_DEBUG
 565 printf("\nkey block\n");
 566 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 567 #endif
 568
 569         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 570                 {
 571                 /* enable vulnerability countermeasure for CBC ciphers with
 572                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 573                  */
 574                 s->s3->need_empty_fragments = 1;
 575
 576                 if (s->session->cipher != NULL)
 577                         {
 578                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
 579                                 s->s3->need_empty_fragments = 0;
 580
 581 #ifndef OPENSSL_NO_RC4
 582                         if (s->session->cipher->algorithm_enc == SSL_RC4)
 583                                 s->s3->need_empty_fragments = 0;
 584 #endif
 585                         }
 586                 }
 587
 588         return(1);
 589 err:
 590         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 591         return(0);
 592         }
 593
 594 int tls1_enc(SSL *s, int send)
 595         {
 596         SSL3_RECORD *rec;
 597         EVP_CIPHER_CTX *ds;
 598         unsigned long l;
 599         int bs,i,ii,j,k,n=0;
 600         const EVP_CIPHER *enc;
 601
 602         if (send)
 603                 {
 604                 if (EVP_MD_CTX_md(s->write_hash))
 605                         n=EVP_MD_CTX_size(s->write_hash);
 606                 ds=s->enc_write_ctx;
 607                 rec= &(s->s3->wrec);
 608                 if (s->enc_write_ctx == NULL)
 609                         enc=NULL;
 610                 else
 611                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 612                 }
 613         else
 614                 {
 615                 if (EVP_MD_CTX_md(s->read_hash))
 616                         n=EVP_MD_CTX_size(s->read_hash);
 617                 ds=s->enc_read_ctx;
 618                 rec= &(s->s3->rrec);
 619                 if (s->enc_read_ctx == NULL)
 620                         enc=NULL;
 621                 else
 622                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 623                 }
 624
 625 #ifdef KSSL_DEBUG
 626         printf("tls1_enc(%d)\n", send);
 627 #endif    /* KSSL_DEBUG */
 628
 629         if ((s->session == NULL) || (ds == NULL) ||
 630                 (enc == NULL))
 631                 {
 632                 memmove(rec->data,rec->input,rec->length);
 633                 rec->input=rec->data;
 634                 }
 635         else
 636                 {
 637                 l=rec->length;
 638                 bs=EVP_CIPHER_block_size(ds->cipher);
 639
 640                 if ((bs != 1) && send)
 641                         {
 642                         i=bs-((int)l%bs);
 643
 644                         /* Add weird padding of upto 256 bytes */
 645
 646                         /* we need to add 'i' padding bytes of value j */
 647                         j=i-1;
 648                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 649                                 {
 650                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 651                                         j++;
 652                                 }
 653                         for (k=(int)l; k<(int)(l+i); k++)
 654                                 rec->input[k]=j;
 655                         l+=i;
 656                         rec->length+=i;
 657                         }
 658
 659 #ifdef KSSL_DEBUG
 660                 {
 661                 unsigned long ui;
 662                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 663                         ds,rec->data,rec->input,l);
 664                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 665                         ds->buf_len, ds->cipher->key_len,
 666                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 667                         ds->cipher->iv_len);
 668                 printf("\t\tIV: ");
 669                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 670                 printf("\n");
 671                 printf("\trec->input=");
 672                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 673                 printf("\n");
 674                 }
 675 #endif  /* KSSL_DEBUG */
 676
 677                 if (!send)
 678                         {
 679                         if (l == 0 || l%bs != 0)
 680                                 {
 681                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 682                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 683                                 return 0;
 684                                 }
 685                         }
 686
 687                 EVP_Cipher(ds,rec->data,rec->input,l);
 688
 689 #ifdef KSSL_DEBUG
 690                 {
 691                 unsigned long i;
 692                 printf("\trec->data=");
 693                 for (i=0; i<l; i++)
 694                         printf(" %02x", rec->data[i]);  printf("\n");
 695                 }
 696 #endif  /* KSSL_DEBUG */
 697
 698                 if ((bs != 1) && !send)
 699                         {
 700                         ii=i=rec->data[l-1]; /* padding_length */
 701                         i++;
 702                         /* NB: if compression is in operation the first packet
 703                          * may not be of even length so the padding bug check
 704                          * cannot be performed. This bug workaround has been
 705                          * around since SSLeay so hopefully it is either fixed
 706                          * now or no buggy implementation supports compression
 707                          * [steve]
 708                          */
 709                         if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 710                                 && !s->expand)
 711                                 {
 712                                 /* First packet is even in size, so check */
 713                                 if ((memcmp(s->s3->read_sequence,
 714                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 715                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 716                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 717                                         i--;
 718                                 }
 719                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 720                          * All of them must have value 'padding_length'. */
 721                         if (i > (int)rec->length)
 722                                 {
 723                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 724                                  * by caller: we don't want to reveal whether this is
 725                                  * a decryption error or a MAC verification failure
 726                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 727                                 return -1;
 728                                 }
 729                         for (j=(int)(l-i); j<(int)l; j++)
 730                                 {
 731                                 if (rec->data[j] != ii)
 732                                         {
 733                                         /* Incorrect padding */
 734                                         return -1;
 735                                         }
 736                                 }
 737                         rec->length-=i;
 738                         }
 739                 }
 740         return(1);
 741         }
 742 int tls1_cert_verify_mac(SSL *s, int md_nid, unsigned char *out)
 743         {
 744         unsigned int ret;
 745         EVP_MD_CTX ctx, *d=NULL;
 746         int i;
 747
 748         if (s->s3->handshake_buffer)
 749                 ssl3_digest_cached_records(s);
 750         for (i=0;i<SSL_MAX_DIGEST;i++)
 751                 {
 752                   if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
 753                         {
 754                         d=s->s3->handshake_dgst[i];
 755                         break;
 756                         }
 757                 }
 758         if (!d) {
 759                 SSLerr(SSL_F_TLS1_CERT_VERIFY_MAC,SSL_R_NO_REQUIRED_DIGEST);
 760                 return 0;
 761         }
 762
 763         EVP_MD_CTX_init(&ctx);
 764         EVP_MD_CTX_copy_ex(&ctx,d);
 765         EVP_DigestFinal_ex(&ctx,out,&ret);
 766         EVP_MD_CTX_cleanup(&ctx);
 767         return((int)ret);
 768         }
 769
 770 int tls1_final_finish_mac(SSL *s,
 771              const char *str, int slen, unsigned char *out)
 772         {
 773         unsigned int i;
 774         EVP_MD_CTX ctx;
 775         unsigned char buf[2*EVP_MAX_MD_SIZE];
 776         unsigned char *q,buf2[12];
 777         int idx;
 778         long mask;
 779         int err=0;
 780         const EVP_MD *md;
 781
 782         q=buf;
 783
 784         EVP_MD_CTX_init(&ctx);
 785
 786         if (s->s3->handshake_buffer)
 787                 ssl3_digest_cached_records(s);
 788
 789         for (idx=0;ssl_get_handshake_digest(idx,&mask,&md);idx++)
 790                 {
 791                 if (mask & s->s3->tmp.new_cipher->algorithm2)
 792                         {
 793                         int hashsize = EVP_MD_size(md);
 794                         if ((size_t)hashsize > (sizeof buf - (size_t)(q-buf)))
 795                                 {
 796                                 /* internal error: 'buf' is too small for this cipersuite! */
 797                                 err = 1;
 798                                 }
 799                         else
 800                                 {
 801                                 EVP_MD_CTX_copy_ex(&ctx,s->s3->handshake_dgst[idx]);
 802                                 EVP_DigestFinal_ex(&ctx,q,&i);
 803                                 if (i != hashsize) /* can't really happen */
 804                                         err = 1;
 805                                 q+=i;
 806                                 }
 807                         }
 808                 }
 809
 810         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 811                  str,slen, buf,(int)(q-buf), NULL,0, NULL,0, NULL,0,
 812                  s->session->master_key,s->session->master_key_length,
 813                  out,buf2,sizeof buf2);
 814         EVP_MD_CTX_cleanup(&ctx);
 815
 816         if (err)
 817                 return 0;
 818         else
 819                 return sizeof buf2;
 820         }
 821
 822 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 823         {
 824         SSL3_RECORD *rec;
 825         unsigned char *mac_sec,*seq;
 826         EVP_MD_CTX *hash;
 827         size_t md_size;
 828         int i;
 829         EVP_MD_CTX hmac, *mac_ctx;
 830         unsigned char buf[5];
 831         int stream_mac = (send?(ssl->mac_flags & SSL_MAC_FLAG_WRITE_MAC_STREAM):(ssl->mac_flags&SSL_MAC_FLAG_READ_MAC_STREAM));
 832
 833         if (send)
 834                 {
 835                 rec= &(ssl->s3->wrec);
 836                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 837                 seq= &(ssl->s3->write_sequence[0]);
 838                 hash=ssl->write_hash;
 839                 }
 840         else
 841                 {
 842                 rec= &(ssl->s3->rrec);
 843                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 844                 seq= &(ssl->s3->read_sequence[0]);
 845                 hash=ssl->read_hash;
 846                 }
 847
 848         md_size=EVP_MD_CTX_size(hash);
 849
 850         buf[0]=rec->type;
 851         buf[1]=(unsigned char)(ssl->version>>8);
 852         buf[2]=(unsigned char)(ssl->version);
 853         buf[3]=rec->length>>8;
 854         buf[4]=rec->length&0xff;
 855
 856         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 857         if (stream_mac)
 858                 {
 859                         mac_ctx = hash;
 860                 }
 861                 else
 862                 {
 863                         EVP_MD_CTX_copy(&hmac,hash);
 864                         mac_ctx = &hmac;
 865                 }
 866
 867         if (ssl->version == DTLS1_VERSION)
 868                 {
 869                 unsigned char dtlsseq[8],*p=dtlsseq;
 870
 871                 s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p);
 872                 memcpy (p,&seq[2],6);
 873
 874                 EVP_DigestSignUpdate(mac_ctx,dtlsseq,8);
 875                 }
 876         else
 877                 EVP_DigestSignUpdate(mac_ctx,seq,8);
 878
 879         EVP_DigestSignUpdate(mac_ctx,buf,5);
 880         EVP_DigestSignUpdate(mac_ctx,rec->input,rec->length);
 881         if (stream_mac) EVP_MD_CTX_copy(&hmac,hash);
 882         EVP_DigestSignFinal(&hmac,md,&md_size);
 883         EVP_MD_CTX_cleanup(&hmac);
 884 #ifdef TLS_DEBUG
 885 printf("sec=");
 886 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 887 printf("seq=");
 888 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 889 printf("buf=");
 890 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 891 printf("rec=");
 892 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 893 #endif
 894
 895         if (ssl->version != DTLS1_VERSION)
 896                 {
 897                 for (i=7; i>=0; i--)
 898                         {
 899                         ++seq[i];
 900                         if (seq[i] != 0) break;
 901                         }
 902                 }
 903
 904 #ifdef TLS_DEBUG
 905 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 906 #endif
 907         return(md_size);
 908         }
 909
 910 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 911              int len)
 912         {
 913         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 914         const void *co = NULL, *so = NULL;
 915         int col = 0, sol = 0;
 916
 917 #ifdef KSSL_DEBUG
 918         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 919 #endif  /* KSSL_DEBUG */
 920
 921 #ifdef TLSEXT_TYPE_opaque_prf_input
 922         if (s->s3->client_opaque_prf_input != NULL && s->s3->server_opaque_prf_input != NULL &&
 923             s->s3->client_opaque_prf_input_len > 0 &&
 924             s->s3->client_opaque_prf_input_len == s->s3->server_opaque_prf_input_len)
 925                 {
 926                 co = s->s3->client_opaque_prf_input;
 927                 col = s->s3->server_opaque_prf_input_len;
 928                 so = s->s3->server_opaque_prf_input;
 929                 sol = s->s3->client_opaque_prf_input_len; /* must be same as col (see draft-rescorla-tls-opaque-prf-input-00.txt, section 3.1) */
 930                 }
 931 #endif
 932
 933         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 934                 TLS_MD_MASTER_SECRET_CONST,TLS_MD_MASTER_SECRET_CONST_SIZE,
 935                 s->s3->client_random,SSL3_RANDOM_SIZE,
 936                 co, col,
 937                 s->s3->server_random,SSL3_RANDOM_SIZE,
 938                 so, sol,
 939                 p,len,
 940                 s->session->master_key,buff,sizeof buff);
 941
 942 #ifdef KSSL_DEBUG
 943         printf ("tls1_generate_master_secret() complete\n");
 944 #endif  /* KSSL_DEBUG */
 945         return(SSL3_MASTER_SECRET_SIZE);
 946         }
 947
 948 int tls1_alert_code(int code)
 949         {
 950         switch (code)
 951                 {
 952         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 953         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 954         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 955         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 956         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 957         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 958         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 959         case SSL_AD_NO_CERTIFICATE:     return(-1);
 960         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 961         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 962         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 963         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 964         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 965         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 966         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 967         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 968         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 969         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 970         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 971         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 972         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 973         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 974         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 975         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 976         case SSL_AD_UNSUPPORTED_EXTENSION: return(TLS1_AD_UNSUPPORTED_EXTENSION);
 977         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(TLS1_AD_CERTIFICATE_UNOBTAINABLE);
 978         case SSL_AD_UNRECOGNIZED_NAME:  return(TLS1_AD_UNRECOGNIZED_NAME);
 979         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE);
 980         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(TLS1_AD_BAD_CERTIFICATE_HASH_VALUE);
 981         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 982 #if 0 /* not appropriate for TLS, not used for DTLS */
 983         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
 984                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 985 #endif
 986         default:                        return(-1);
 987                 }
 988         }
 989