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 #ifdef KSSL_DEBUG
 145 #include <openssl/des.h>
 146 #endif
 147
 148 /* seed1 through seed5 are virtually concatenated */
 149 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 150                         int sec_len,
 151                         const void *seed1, int seed1_len,
 152                         const void *seed2, int seed2_len,
 153                         const void *seed3, int seed3_len,
 154                         const void *seed4, int seed4_len,
 155                         const void *seed5, int seed5_len,
 156                         unsigned char *out, int olen)
 157         {
 158         int chunk,n;
 159         unsigned int j;
 160         HMAC_CTX ctx;
 161         HMAC_CTX ctx_tmp;
 162         unsigned char A1[EVP_MAX_MD_SIZE];
 163         unsigned int A1_len;
 164
 165         chunk=EVP_MD_size(md);
 166
 167         HMAC_CTX_init(&ctx);
 168         HMAC_CTX_init(&ctx_tmp);
 169         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
 170         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
 171         if (seed1 != NULL) HMAC_Update(&ctx,seed1,seed1_len);
 172         if (seed2 != NULL) HMAC_Update(&ctx,seed2,seed2_len);
 173         if (seed3 != NULL) HMAC_Update(&ctx,seed3,seed3_len);
 174         if (seed4 != NULL) HMAC_Update(&ctx,seed4,seed4_len);
 175         if (seed5 != NULL) HMAC_Update(&ctx,seed5,seed5_len);
 176         HMAC_Final(&ctx,A1,&A1_len);
 177
 178         n=0;
 179         for (;;)
 180                 {
 181                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
 182                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
 183                 HMAC_Update(&ctx,A1,A1_len);
 184                 HMAC_Update(&ctx_tmp,A1,A1_len);
 185                 if (seed1 != NULL) HMAC_Update(&ctx,seed1,seed1_len);
 186                 if (seed2 != NULL) HMAC_Update(&ctx,seed2,seed2_len);
 187                 if (seed3 != NULL) HMAC_Update(&ctx,seed3,seed3_len);
 188                 if (seed4 != NULL) HMAC_Update(&ctx,seed4,seed4_len);
 189                 if (seed5 != NULL) HMAC_Update(&ctx,seed5,seed5_len);
 190
 191                 if (olen > chunk)
 192                         {
 193                         HMAC_Final(&ctx,out,&j);
 194                         out+=j;
 195                         olen-=j;
 196                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 197                         }
 198                 else    /* last one */
 199                         {
 200                         HMAC_Final(&ctx,A1,&A1_len);
 201                         memcpy(out,A1,olen);
 202                         break;
 203                         }
 204                 }
 205         HMAC_CTX_cleanup(&ctx);
 206         HMAC_CTX_cleanup(&ctx_tmp);
 207         OPENSSL_cleanse(A1,sizeof(A1));
 208         }
 209
 210 /* seed1 through seed5 are virtually concatenated */
 211 static void tls1_PRF(long digest_mask,
 212                      const void *seed1, int seed1_len,
 213                      const void *seed2, int seed2_len,
 214                      const void *seed3, int seed3_len,
 215                      const void *seed4, int seed4_len,
 216                      const void *seed5, int seed5_len,
 217                      const unsigned char *sec, int slen,
 218                      unsigned char *out1,
 219                      unsigned char *out2, int olen)
 220         {
 221         int len,i,idx,count;
 222         const unsigned char *S1;
 223         long m;
 224         const EVP_MD *md;
 225
 226         /* Count number of digests and partition sec evenly */
 227         count=0;
 228         for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) {
 229                 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) count++;
 230         }
 231         len=slen/count;
 232         S1=sec;
 233         memset(out1,0,olen);
 234         for (idx=0;ssl_get_handshake_digest(idx,&m,&md);idx++) {
 235                 if ((m<<TLS1_PRF_DGST_SHIFT) & digest_mask) {
 236                         if (!md) {
 237                                 SSLerr(SSL_F_TLS1_PRF,
 238                                 SSL_R_UNSUPPORTED_DIGEST_TYPE);
 239                                 return;
 240                         }
 241                         tls1_P_hash(md ,S1,len+(slen&1),
 242                                     seed1,seed1_len,seed2,seed2_len,seed3,seed3_len,seed4,seed4_len,seed5,seed5_len,
 243                                     out2,olen);
 244                         S1+=len;
 245                         for (i=0; i<olen; i++)
 246                         {
 247                                 out1[i]^=out2[i];
 248                         }
 249                 }
 250         }
 251
 252 }
 253 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 254              unsigned char *tmp, int num)
 255         {
 256         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 257                  TLS_MD_KEY_EXPANSION_CONST,TLS_MD_KEY_EXPANSION_CONST_SIZE,
 258                  s->s3->server_random,SSL3_RANDOM_SIZE,
 259                  s->s3->client_random,SSL3_RANDOM_SIZE,
 260                  NULL,0,NULL,0,
 261                  s->session->master_key,s->session->master_key_length,
 262                  km,tmp,num);
 263 #ifdef KSSL_DEBUG
 264         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 265                 s->session->master_key_length);
 266         {
 267         int i;
 268         for (i=0; i < s->session->master_key_length; i++)
 269                 {
 270                 printf("%02X", s->session->master_key[i]);
 271                 }
 272         printf("\n");  }
 273 #endif    /* KSSL_DEBUG */
 274         }
 275
 276 int tls1_change_cipher_state(SSL *s, int which)
 277         {
 278         static const unsigned char empty[]="";
 279         unsigned char *p,*key_block,*mac_secret;
 280         unsigned char *exp_label;
 281         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 282         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 283         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 284         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 285         unsigned char *ms,*key,*iv,*er1,*er2;
 286         int client_write;
 287         EVP_CIPHER_CTX *dd;
 288         const EVP_CIPHER *c;
 289 #ifndef OPENSSL_NO_COMP
 290         const SSL_COMP *comp;
 291 #endif
 292         const EVP_MD *m;
 293         int mac_type;
 294         int *mac_secret_size;
 295         EVP_MD_CTX *mac_ctx;
 296         EVP_PKEY *mac_key;
 297         int is_export,n,i,j,k,exp_label_len,cl;
 298         int reuse_dd = 0;
 299
 300         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 301         c=s->s3->tmp.new_sym_enc;
 302         m=s->s3->tmp.new_hash;
 303         mac_type = s->s3->tmp.new_mac_pkey_type;
 304 #ifndef OPENSSL_NO_COMP
 305         comp=s->s3->tmp.new_compression;
 306 #endif
 307         key_block=s->s3->tmp.key_block;
 308
 309 #ifdef KSSL_DEBUG
 310         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 311         printf("\talg= %ld/%ld, comp= %p\n",
 312                s->s3->tmp.new_cipher->algorithm_mkey,
 313                s->s3->tmp.new_cipher->algorithm_auth,
 314                (void *)comp);
 315         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", (void *)c);
 316         printf("\tevp_cipher: nid, blksz= %d, %ld, keylen=%ld, ivlen=%ld\n",
 317                 c->nid,(unsigned long)c->block_size,
 318                 (unsigned long)c->key_len,(unsigned long)c->iv_len);
 319         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 320         {
 321         int ki;
 322         for (ki=0; ki<s->s3->tmp.key_block_length; ki++)
 323                 printf("%02x", key_block[ki]);  printf("\n");
 324         }
 325 #endif  /* KSSL_DEBUG */
 326
 327         if (which & SSL3_CC_READ)
 328                 {
 329                 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 330                         s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 331                         else
 332                         s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 333
 334                 if (s->enc_read_ctx != NULL)
 335                         reuse_dd = 1;
 336                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 337                         goto err;
 338                 else
 339                         /* make sure it's intialized in case we exit later with an error */
 340                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 341                 dd= s->enc_read_ctx;
 342                 mac_ctx=ssl_replace_hash(&s->read_hash,NULL);
 343 #ifndef OPENSSL_NO_COMP
 344                 if (s->expand != NULL)
 345                         {
 346                         COMP_CTX_free(s->expand);
 347                         s->expand=NULL;
 348                         }
 349                 if (comp != NULL)
 350                         {
 351                         s->expand=COMP_CTX_new(comp->method);
 352                         if (s->expand == NULL)
 353                                 {
 354                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 355                                 goto err2;
 356                                 }
 357                         if (s->s3->rrec.comp == NULL)
 358                                 s->s3->rrec.comp=(unsigned char *)
 359                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 360                         if (s->s3->rrec.comp == NULL)
 361                                 goto err;
 362                         }
 363 #endif
 364                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 365                 if (s->version != DTLS1_VERSION)
 366                         memset(&(s->s3->read_sequence[0]),0,8);
 367                 mac_secret= &(s->s3->read_mac_secret[0]);
 368                 mac_secret_size=&(s->s3->read_mac_secret_size);
 369                 }
 370         else
 371                 {
 372                 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 373                         s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 374                         else
 375                         s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 376                 if (s->enc_write_ctx != NULL)
 377                         reuse_dd = 1;
 378                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 379                         goto err;
 380                 else
 381                         /* make sure it's intialized in case we exit later with an error */
 382                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 383                 dd= s->enc_write_ctx;
 384                 mac_ctx = ssl_replace_hash(&s->write_hash,NULL);
 385 #ifndef OPENSSL_NO_COMP
 386                 if (s->compress != NULL)
 387                         {
 388                         COMP_CTX_free(s->compress);
 389                         s->compress=NULL;
 390                         }
 391                 if (comp != NULL)
 392                         {
 393                         s->compress=COMP_CTX_new(comp->method);
 394                         if (s->compress == NULL)
 395                                 {
 396                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 397                                 goto err2;
 398                                 }
 399                         }
 400 #endif
 401                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 402                 if (s->version != DTLS1_VERSION)
 403                         memset(&(s->s3->write_sequence[0]),0,8);
 404                 mac_secret= &(s->s3->write_mac_secret[0]);
 405                 mac_secret_size = &(s->s3->write_mac_secret_size);
 406                 }
 407
 408         if (reuse_dd)
 409                 EVP_CIPHER_CTX_cleanup(dd);
 410
 411         p=s->s3->tmp.key_block;
 412         i=*mac_secret_size=s->s3->tmp.new_mac_secret_size;
 413
 414         cl=EVP_CIPHER_key_length(c);
 415         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 416                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 417         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 418         k=EVP_CIPHER_iv_length(c);
 419         er1= &(s->s3->client_random[0]);
 420         er2= &(s->s3->server_random[0]);
 421         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 422                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 423                 {
 424                 ms=  &(p[ 0]); n=i+i;
 425                 key= &(p[ n]); n+=j+j;
 426                 iv=  &(p[ n]); n+=k+k;
 427                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 428                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 429                 client_write=1;
 430                 }
 431         else
 432                 {
 433                 n=i;
 434                 ms=  &(p[ n]); n+=i+j;
 435                 key= &(p[ n]); n+=j+k;
 436                 iv=  &(p[ n]); n+=k;
 437                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 438                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 439                 client_write=0;
 440                 }
 441
 442         if (n > s->s3->tmp.key_block_length)
 443                 {
 444                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 445                 goto err2;
 446                 }
 447
 448         memcpy(mac_secret,ms,i);
 449         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,
 450                         mac_secret,*mac_secret_size);
 451         EVP_DigestSignInit(mac_ctx,NULL,m,NULL,mac_key);
 452         EVP_PKEY_free(mac_key);
 453 #ifdef TLS_DEBUG
 454 printf("which = %04X\nmac key=",which);
 455 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 456 #endif
 457         if (is_export)
 458                 {
 459                 /* In here I set both the read and write key/iv to the
 460                  * same value since only the correct one will be used :-).
 461                  */
 462                 tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 463                          exp_label,exp_label_len,
 464                          s->s3->client_random,SSL3_RANDOM_SIZE,
 465                          s->s3->server_random,SSL3_RANDOM_SIZE,
 466                          NULL,0,NULL,0,
 467                          key,j,tmp1,tmp2,EVP_CIPHER_key_length(c));
 468                 key=tmp1;
 469
 470                 if (k > 0)
 471                         {
 472                         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 473                                  TLS_MD_IV_BLOCK_CONST,TLS_MD_IV_BLOCK_CONST_SIZE,
 474                                  s->s3->client_random,SSL3_RANDOM_SIZE,
 475                                  s->s3->server_random,SSL3_RANDOM_SIZE,
 476                                  NULL,0,NULL,0,
 477                                  empty,0,iv1,iv2,k*2);
 478                         if (client_write)
 479                                 iv=iv1;
 480                         else
 481                                 iv= &(iv1[k]);
 482                         }
 483                 }
 484
 485         s->session->key_arg_length=0;
 486 #ifdef KSSL_DEBUG
 487         {
 488         int ki;
 489         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 490         printf("\tkey= ");
 491         for (ki=0; ki<c->key_len; ki++) printf("%02x", key[ki]);
 492         printf("\n");
 493         printf("\t iv= ");
 494         for (ki=0; ki<c->iv_len; ki++) printf("%02x", iv[ki]);
 495         printf("\n");
 496         }
 497 #endif  /* KSSL_DEBUG */
 498
 499         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 500 #ifdef TLS_DEBUG
 501 printf("which = %04X\nkey=",which);
 502 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 503 printf("\niv=");
 504 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 505 printf("\n");
 506 #endif
 507
 508         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 509         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 510         OPENSSL_cleanse(iv1,sizeof(iv1));
 511         OPENSSL_cleanse(iv2,sizeof(iv2));
 512         return(1);
 513 err:
 514         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 515 err2:
 516         return(0);
 517         }
 518
 519 int tls1_setup_key_block(SSL *s)
 520         {
 521         unsigned char *p1,*p2;
 522         const EVP_CIPHER *c;
 523         const EVP_MD *hash;
 524         int num;
 525         SSL_COMP *comp;
 526         int mac_type= NID_undef,mac_secret_size=0;
 527
 528 #ifdef KSSL_DEBUG
 529         printf ("tls1_setup_key_block()\n");
 530 #endif  /* KSSL_DEBUG */
 531
 532         if (s->s3->tmp.key_block_length != 0)
 533                 return(1);
 534
 535         if (!ssl_cipher_get_evp(s->session,&c,&hash,&mac_type,&mac_secret_size,&comp))
 536                 {
 537                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 538                 return(0);
 539                 }
 540
 541         s->s3->tmp.new_sym_enc=c;
 542         s->s3->tmp.new_hash=hash;
 543         s->s3->tmp.new_mac_pkey_type = mac_type;
 544         s->s3->tmp.new_mac_secret_size = mac_secret_size;
 545         num=EVP_CIPHER_key_length(c)+mac_secret_size+EVP_CIPHER_iv_length(c);
 546         num*=2;
 547
 548         ssl3_cleanup_key_block(s);
 549
 550         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 551                 goto err;
 552         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 553                 goto err;
 554
 555         s->s3->tmp.key_block_length=num;
 556         s->s3->tmp.key_block=p1;
 557
 558
 559 #ifdef TLS_DEBUG
 560 printf("client random\n");
 561 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 562 printf("server random\n");
 563 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 564 printf("pre-master\n");
 565 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 566 #endif
 567         tls1_generate_key_block(s,p1,p2,num);
 568         OPENSSL_cleanse(p2,num);
 569         OPENSSL_free(p2);
 570 #ifdef TLS_DEBUG
 571 printf("\nkey block\n");
 572 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 573 #endif
 574
 575         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 576                 {
 577                 /* enable vulnerability countermeasure for CBC ciphers with
 578                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 579                  */
 580                 s->s3->need_empty_fragments = 1;
 581
 582                 if (s->session->cipher != NULL)
 583                         {
 584                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
 585                                 s->s3->need_empty_fragments = 0;
 586
 587 #ifndef OPENSSL_NO_RC4
 588                         if (s->session->cipher->algorithm_enc == SSL_RC4)
 589                                 s->s3->need_empty_fragments = 0;
 590 #endif
 591                         }
 592                 }
 593
 594         return(1);
 595 err:
 596         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 597         return(0);
 598         }
 599
 600 int tls1_enc(SSL *s, int send)
 601         {
 602         SSL3_RECORD *rec;
 603         EVP_CIPHER_CTX *ds;
 604         unsigned long l;
 605         int bs,i,ii,j,k,n=0;
 606         const EVP_CIPHER *enc;
 607
 608         if (send)
 609                 {
 610                 if (EVP_MD_CTX_md(s->write_hash))
 611                         n=EVP_MD_CTX_size(s->write_hash);
 612                 ds=s->enc_write_ctx;
 613                 rec= &(s->s3->wrec);
 614                 if (s->enc_write_ctx == NULL)
 615                         enc=NULL;
 616                 else
 617                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 618                 }
 619         else
 620                 {
 621                 if (EVP_MD_CTX_md(s->read_hash))
 622                         n=EVP_MD_CTX_size(s->read_hash);
 623                 ds=s->enc_read_ctx;
 624                 rec= &(s->s3->rrec);
 625                 if (s->enc_read_ctx == NULL)
 626                         enc=NULL;
 627                 else
 628                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 629                 }
 630
 631 #ifdef KSSL_DEBUG
 632         printf("tls1_enc(%d)\n", send);
 633 #endif    /* KSSL_DEBUG */
 634
 635         if ((s->session == NULL) || (ds == NULL) ||
 636                 (enc == NULL))
 637                 {
 638                 memmove(rec->data,rec->input,rec->length);
 639                 rec->input=rec->data;
 640                 }
 641         else
 642                 {
 643                 l=rec->length;
 644                 bs=EVP_CIPHER_block_size(ds->cipher);
 645
 646                 if ((bs != 1) && send)
 647                         {
 648                         i=bs-((int)l%bs);
 649
 650                         /* Add weird padding of upto 256 bytes */
 651
 652                         /* we need to add 'i' padding bytes of value j */
 653                         j=i-1;
 654                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 655                                 {
 656                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 657                                         j++;
 658                                 }
 659                         for (k=(int)l; k<(int)(l+i); k++)
 660                                 rec->input[k]=j;
 661                         l+=i;
 662                         rec->length+=i;
 663                         }
 664
 665 #ifdef KSSL_DEBUG
 666                 {
 667                 unsigned long ui;
 668                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 669                         (void *)ds,rec->data,rec->input,l);
 670                 printf("\tEVP_CIPHER_CTX: %ld buf_len, %ld key_len [%ld %ld], %ld iv_len\n",
 671                         (unsigned long)ds->buf_len,
 672                         (unsigned long)ds->cipher->key_len,
 673                         (unsigned long)DES_KEY_SZ,
 674                         (unsigned long)DES_SCHEDULE_SZ,
 675                         (unsigned long)ds->cipher->iv_len);
 676                 printf("\t\tIV: ");
 677                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 678                 printf("\n");
 679                 printf("\trec->input=");
 680                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 681                 printf("\n");
 682                 }
 683 #endif  /* KSSL_DEBUG */
 684
 685                 if (!send)
 686                         {
 687                         if (l == 0 || l%bs != 0)
 688                                 {
 689                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 690                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 691                                 return 0;
 692                                 }
 693                         }
 694
 695                 EVP_Cipher(ds,rec->data,rec->input,l);
 696
 697 #ifdef KSSL_DEBUG
 698                 {
 699                 unsigned long ki;
 700                 printf("\trec->data=");
 701                 for (ki=0; ki<l; i++)
 702                         printf(" %02x", rec->data[ki]);  printf("\n");
 703                 }
 704 #endif  /* KSSL_DEBUG */
 705
 706                 if ((bs != 1) && !send)
 707                         {
 708                         ii=i=rec->data[l-1]; /* padding_length */
 709                         i++;
 710                         /* NB: if compression is in operation the first packet
 711                          * may not be of even length so the padding bug check
 712                          * cannot be performed. This bug workaround has been
 713                          * around since SSLeay so hopefully it is either fixed
 714                          * now or no buggy implementation supports compression
 715                          * [steve]
 716                          */
 717                         if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 718                                 && !s->expand)
 719                                 {
 720                                 /* First packet is even in size, so check */
 721                                 if ((memcmp(s->s3->read_sequence,
 722                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 723                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 724                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 725                                         i--;
 726                                 }
 727                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 728                          * All of them must have value 'padding_length'. */
 729                         if (i > (int)rec->length)
 730                                 {
 731                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 732                                  * by caller: we don't want to reveal whether this is
 733                                  * a decryption error or a MAC verification failure
 734                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 735                                 return -1;
 736                                 }
 737                         for (j=(int)(l-i); j<(int)l; j++)
 738                                 {
 739                                 if (rec->data[j] != ii)
 740                                         {
 741                                         /* Incorrect padding */
 742                                         return -1;
 743                                         }
 744                                 }
 745                         rec->length-=i;
 746                         }
 747                 }
 748         return(1);
 749         }
 750 int tls1_cert_verify_mac(SSL *s, int md_nid, unsigned char *out)
 751         {
 752         unsigned int ret;
 753         EVP_MD_CTX ctx, *d=NULL;
 754         int i;
 755
 756         if (s->s3->handshake_buffer)
 757                 ssl3_digest_cached_records(s);
 758         for (i=0;i<SSL_MAX_DIGEST;i++)
 759                 {
 760                   if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid)
 761                         {
 762                         d=s->s3->handshake_dgst[i];
 763                         break;
 764                         }
 765                 }
 766         if (!d) {
 767                 SSLerr(SSL_F_TLS1_CERT_VERIFY_MAC,SSL_R_NO_REQUIRED_DIGEST);
 768                 return 0;
 769         }
 770
 771         EVP_MD_CTX_init(&ctx);
 772         EVP_MD_CTX_copy_ex(&ctx,d);
 773         EVP_DigestFinal_ex(&ctx,out,&ret);
 774         EVP_MD_CTX_cleanup(&ctx);
 775         return((int)ret);
 776         }
 777
 778 int tls1_final_finish_mac(SSL *s,
 779              const char *str, int slen, unsigned char *out)
 780         {
 781         unsigned int i;
 782         EVP_MD_CTX ctx;
 783         unsigned char buf[2*EVP_MAX_MD_SIZE];
 784         unsigned char *q,buf2[12];
 785         int idx;
 786         long mask;
 787         int err=0;
 788         const EVP_MD *md;
 789
 790         q=buf;
 791
 792         EVP_MD_CTX_init(&ctx);
 793
 794         if (s->s3->handshake_buffer)
 795                 ssl3_digest_cached_records(s);
 796
 797         for (idx=0;ssl_get_handshake_digest(idx,&mask,&md);idx++)
 798                 {
 799                 if (mask & s->s3->tmp.new_cipher->algorithm2)
 800                         {
 801                         unsigned int hashsize = EVP_MD_size(md);
 802                         if (hashsize > (sizeof buf - (size_t)(q-buf)))
 803                                 {
 804                                 /* internal error: 'buf' is too small for this cipersuite! */
 805                                 err = 1;
 806                                 }
 807                         else
 808                                 {
 809                                 EVP_MD_CTX_copy_ex(&ctx,s->s3->handshake_dgst[idx]);
 810                                 EVP_DigestFinal_ex(&ctx,q,&i);
 811                                 if (i != hashsize) /* can't really happen */
 812                                         err = 1;
 813                                 q+=i;
 814                                 }
 815                         }
 816                 }
 817
 818         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 819                  str,slen, buf,(int)(q-buf), NULL,0, NULL,0, NULL,0,
 820                  s->session->master_key,s->session->master_key_length,
 821                  out,buf2,sizeof buf2);
 822         EVP_MD_CTX_cleanup(&ctx);
 823
 824         if (err)
 825                 return 0;
 826         else
 827                 return sizeof buf2;
 828         }
 829
 830 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 831         {
 832         SSL3_RECORD *rec;
 833         unsigned char *mac_sec,*seq;
 834         EVP_MD_CTX *hash;
 835         size_t md_size;
 836         int i;
 837         EVP_MD_CTX hmac, *mac_ctx;
 838         unsigned char buf[5];
 839         int stream_mac = (send?(ssl->mac_flags & SSL_MAC_FLAG_WRITE_MAC_STREAM):(ssl->mac_flags&SSL_MAC_FLAG_READ_MAC_STREAM));
 840
 841         if (send)
 842                 {
 843                 rec= &(ssl->s3->wrec);
 844                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 845                 seq= &(ssl->s3->write_sequence[0]);
 846                 hash=ssl->write_hash;
 847                 }
 848         else
 849                 {
 850                 rec= &(ssl->s3->rrec);
 851                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 852                 seq= &(ssl->s3->read_sequence[0]);
 853                 hash=ssl->read_hash;
 854                 }
 855
 856         md_size=EVP_MD_CTX_size(hash);
 857
 858         buf[0]=rec->type;
 859         buf[1]=(unsigned char)(ssl->version>>8);
 860         buf[2]=(unsigned char)(ssl->version);
 861         buf[3]=rec->length>>8;
 862         buf[4]=rec->length&0xff;
 863
 864         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 865         if (stream_mac)
 866                 {
 867                         mac_ctx = hash;
 868                 }
 869                 else
 870                 {
 871                         EVP_MD_CTX_copy(&hmac,hash);
 872                         mac_ctx = &hmac;
 873                 }
 874
 875         if (ssl->version == DTLS1_VERSION)
 876                 {
 877                 unsigned char dtlsseq[8],*p=dtlsseq;
 878
 879                 s2n(send?ssl->d1->w_epoch:ssl->d1->r_epoch, p);
 880                 memcpy (p,&seq[2],6);
 881
 882                 EVP_DigestSignUpdate(mac_ctx,dtlsseq,8);
 883                 }
 884         else
 885                 EVP_DigestSignUpdate(mac_ctx,seq,8);
 886
 887         EVP_DigestSignUpdate(mac_ctx,buf,5);
 888         EVP_DigestSignUpdate(mac_ctx,rec->input,rec->length);
 889         EVP_DigestSignFinal(mac_ctx,md,&md_size);
 890         if (!stream_mac) EVP_MD_CTX_cleanup(&hmac);
 891 #ifdef TLS_DEBUG
 892 printf("sec=");
 893 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 894 printf("seq=");
 895 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 896 printf("buf=");
 897 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 898 printf("rec=");
 899 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 900 #endif
 901
 902         if (ssl->version != DTLS1_VERSION)
 903                 {
 904                 for (i=7; i>=0; i--)
 905                         {
 906                         ++seq[i];
 907                         if (seq[i] != 0) break;
 908                         }
 909                 }
 910
 911 #ifdef TLS_DEBUG
 912 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 913 #endif
 914         return(md_size);
 915         }
 916
 917 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 918              int len)
 919         {
 920         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 921         const void *co = NULL, *so = NULL;
 922         int col = 0, sol = 0;
 923
 924 #ifdef KSSL_DEBUG
 925         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", (void *)s,out, p,len);
 926 #endif  /* KSSL_DEBUG */
 927
 928 #ifdef TLSEXT_TYPE_opaque_prf_input
 929         if (s->s3->client_opaque_prf_input != NULL && s->s3->server_opaque_prf_input != NULL &&
 930             s->s3->client_opaque_prf_input_len > 0 &&
 931             s->s3->client_opaque_prf_input_len == s->s3->server_opaque_prf_input_len)
 932                 {
 933                 co = s->s3->client_opaque_prf_input;
 934                 col = s->s3->server_opaque_prf_input_len;
 935                 so = s->s3->server_opaque_prf_input;
 936                 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) */
 937                 }
 938 #endif
 939
 940         tls1_PRF(s->s3->tmp.new_cipher->algorithm2,
 941                 TLS_MD_MASTER_SECRET_CONST,TLS_MD_MASTER_SECRET_CONST_SIZE,
 942                 s->s3->client_random,SSL3_RANDOM_SIZE,
 943                 co, col,
 944                 s->s3->server_random,SSL3_RANDOM_SIZE,
 945                 so, sol,
 946                 p,len,
 947                 s->session->master_key,buff,sizeof buff);
 948
 949 #ifdef KSSL_DEBUG
 950         printf ("tls1_generate_master_secret() complete\n");
 951 #endif  /* KSSL_DEBUG */
 952         return(SSL3_MASTER_SECRET_SIZE);
 953         }
 954
 955 int tls1_alert_code(int code)
 956         {
 957         switch (code)
 958                 {
 959         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 960         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 961         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 962         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 963         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 964         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 965         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 966         case SSL_AD_NO_CERTIFICATE:     return(-1);
 967         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 968         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 969         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 970         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 971         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 972         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 973         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 974         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 975         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 976         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 977         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 978         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 979         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 980         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 981         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 982         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 983         case SSL_AD_UNSUPPORTED_EXTENSION: return(TLS1_AD_UNSUPPORTED_EXTENSION);
 984         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(TLS1_AD_CERTIFICATE_UNOBTAINABLE);
 985         case SSL_AD_UNRECOGNIZED_NAME:  return(TLS1_AD_UNRECOGNIZED_NAME);
 986         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE);
 987         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(TLS1_AD_BAD_CERTIFICATE_HASH_VALUE);
 988         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 989 #if 0 /* not appropriate for TLS, not used for DTLS */
 990         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
 991                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 992 #endif
 993         default:                        return(-1);
 994                 }
 995         }
 996