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 static void tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
 146                         int sec_len, unsigned char *seed, int seed_len,
 147                         unsigned char *out, int olen)
 148         {
 149         int chunk,n;
 150         unsigned int j;
 151         HMAC_CTX ctx;
 152         HMAC_CTX ctx_tmp;
 153         unsigned char A1[EVP_MAX_MD_SIZE];
 154         unsigned int A1_len;
 155
 156         chunk=EVP_MD_size(md);
 157
 158         HMAC_CTX_init(&ctx);
 159         HMAC_CTX_init(&ctx_tmp);
 160         HMAC_Init_ex(&ctx,sec,sec_len,md, NULL);
 161         HMAC_Init_ex(&ctx_tmp,sec,sec_len,md, NULL);
 162         HMAC_Update(&ctx,seed,seed_len);
 163         HMAC_Final(&ctx,A1,&A1_len);
 164
 165         n=0;
 166         for (;;)
 167                 {
 168                 HMAC_Init_ex(&ctx,NULL,0,NULL,NULL); /* re-init */
 169                 HMAC_Init_ex(&ctx_tmp,NULL,0,NULL,NULL); /* re-init */
 170                 HMAC_Update(&ctx,A1,A1_len);
 171                 HMAC_Update(&ctx_tmp,A1,A1_len);
 172                 HMAC_Update(&ctx,seed,seed_len);
 173
 174                 if (olen > chunk)
 175                         {
 176                         HMAC_Final(&ctx,out,&j);
 177                         out+=j;
 178                         olen-=j;
 179                         HMAC_Final(&ctx_tmp,A1,&A1_len); /* calc the next A1 value */
 180                         }
 181                 else    /* last one */
 182                         {
 183                         HMAC_Final(&ctx,A1,&A1_len);
 184                         memcpy(out,A1,olen);
 185                         break;
 186                         }
 187                 }
 188         HMAC_CTX_cleanup(&ctx);
 189         HMAC_CTX_cleanup(&ctx_tmp);
 190         OPENSSL_cleanse(A1,sizeof(A1));
 191         }
 192
 193 static void tls1_PRF(const EVP_MD *md5, const EVP_MD *sha1,
 194                      unsigned char *label, int label_len,
 195                      const unsigned char *sec, int slen, unsigned char *out1,
 196                      unsigned char *out2, int olen)
 197         {
 198         int len,i;
 199         const unsigned char *S1,*S2;
 200
 201         len=slen/2;
 202         S1=sec;
 203         S2= &(sec[len]);
 204         len+=(slen&1); /* add for odd, make longer */
 205
 206
 207         tls1_P_hash(md5 ,S1,len,label,label_len,out1,olen);
 208         tls1_P_hash(sha1,S2,len,label,label_len,out2,olen);
 209
 210         for (i=0; i<olen; i++)
 211                 out1[i]^=out2[i];
 212         }
 213
 214 static void tls1_generate_key_block(SSL *s, unsigned char *km,
 215              unsigned char *tmp, int num)
 216         {
 217         unsigned char *p;
 218         unsigned char buf[SSL3_RANDOM_SIZE*2+
 219                 TLS_MD_MAX_CONST_SIZE];
 220         p=buf;
 221
 222         memcpy(p,TLS_MD_KEY_EXPANSION_CONST,
 223                 TLS_MD_KEY_EXPANSION_CONST_SIZE);
 224         p+=TLS_MD_KEY_EXPANSION_CONST_SIZE;
 225         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 226         p+=SSL3_RANDOM_SIZE;
 227         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 228         p+=SSL3_RANDOM_SIZE;
 229
 230         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),
 231                  s->session->master_key,s->session->master_key_length,
 232                  km,tmp,num);
 233 #ifdef KSSL_DEBUG
 234         printf("tls1_generate_key_block() ==> %d byte master_key =\n\t",
 235                 s->session->master_key_length);
 236         {
 237         int i;
 238         for (i=0; i < s->session->master_key_length; i++)
 239                 {
 240                 printf("%02X", s->session->master_key[i]);
 241                 }
 242         printf("\n");  }
 243 #endif    /* KSSL_DEBUG */
 244         }
 245
 246 int tls1_change_cipher_state(SSL *s, int which)
 247         {
 248         static const unsigned char empty[]="";
 249         unsigned char *p,*key_block,*mac_secret;
 250         unsigned char *exp_label,buf[TLS_MD_MAX_CONST_SIZE+
 251                 SSL3_RANDOM_SIZE*2];
 252         unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 253         unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 254         unsigned char iv1[EVP_MAX_IV_LENGTH*2];
 255         unsigned char iv2[EVP_MAX_IV_LENGTH*2];
 256         unsigned char *ms,*key,*iv,*er1,*er2;
 257         int client_write;
 258         EVP_CIPHER_CTX *dd;
 259         const EVP_CIPHER *c;
 260 #ifndef OPENSSL_NO_COMP
 261         const SSL_COMP *comp;
 262 #endif
 263         const EVP_MD *m;
 264         int mac_type;
 265         int *mac_secret_size;
 266         EVP_MD_CTX *mac_ctx;
 267         EVP_PKEY *mac_key;
 268         int is_export,n,i,j,k,exp_label_len,cl;
 269         int reuse_dd = 0;
 270
 271         is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
 272         c=s->s3->tmp.new_sym_enc;
 273         m=s->s3->tmp.new_hash;
 274         mac_type = s->s3->tmp.new_mac_pkey_type;
 275 #ifndef OPENSSL_NO_COMP
 276         comp=s->s3->tmp.new_compression;
 277 #endif
 278         key_block=s->s3->tmp.key_block;
 279
 280 #ifdef KSSL_DEBUG
 281         printf("tls1_change_cipher_state(which= %d) w/\n", which);
 282         printf("\talg= %ld/%ld, comp= %p\n",
 283                s->s3->tmp.new_cipher->algorithm_mkey,
 284                s->s3->tmp.new_cipher->algorithm_auth,
 285                comp);
 286         printf("\tevp_cipher == %p ==? &d_cbc_ede_cipher3\n", c);
 287         printf("\tevp_cipher: nid, blksz= %d, %d, keylen=%d, ivlen=%d\n",
 288                 c->nid,c->block_size,c->key_len,c->iv_len);
 289         printf("\tkey_block: len= %d, data= ", s->s3->tmp.key_block_length);
 290         {
 291         int i;
 292         for (i=0; i<s->s3->tmp.key_block_length; i++)
 293                 printf("%02x", key_block[i]);  printf("\n");
 294         }
 295 #endif  /* KSSL_DEBUG */
 296
 297         if (which & SSL3_CC_READ)
 298                 {
 299                 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 300                         s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 301                         else
 302                         s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 303
 304                 if (s->enc_read_ctx != NULL)
 305                         reuse_dd = 1;
 306                 else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 307                         goto err;
 308                 else
 309                         /* make sure it's intialized in case we exit later with an error */
 310                         EVP_CIPHER_CTX_init(s->enc_read_ctx);
 311                 dd= s->enc_read_ctx;
 312                 mac_ctx=ssl_replace_hash(&s->read_hash,NULL);
 313 #ifndef OPENSSL_NO_COMP
 314                 if (s->expand != NULL)
 315                         {
 316                         COMP_CTX_free(s->expand);
 317                         s->expand=NULL;
 318                         }
 319                 if (comp != NULL)
 320                         {
 321                         s->expand=COMP_CTX_new(comp->method);
 322                         if (s->expand == NULL)
 323                                 {
 324                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 325                                 goto err2;
 326                                 }
 327                         if (s->s3->rrec.comp == NULL)
 328                                 s->s3->rrec.comp=(unsigned char *)
 329                                         OPENSSL_malloc(SSL3_RT_MAX_ENCRYPTED_LENGTH);
 330                         if (s->s3->rrec.comp == NULL)
 331                                 goto err;
 332                         }
 333 #endif
 334                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 335                 if (s->version != DTLS1_VERSION)
 336                         memset(&(s->s3->read_sequence[0]),0,8);
 337                 mac_secret= &(s->s3->read_mac_secret[0]);
 338                 mac_secret_size=&(s->s3->read_mac_secret_size);
 339                 }
 340         else
 341                 {
 342                 if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 343                         s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 344                         else
 345                         s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 346                 if (s->enc_write_ctx != NULL)
 347                         reuse_dd = 1;
 348                 else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
 349                         goto err;
 350                 else
 351                         /* make sure it's intialized in case we exit later with an error */
 352                         EVP_CIPHER_CTX_init(s->enc_write_ctx);
 353                 dd= s->enc_write_ctx;
 354                 mac_ctx = ssl_replace_hash(&s->write_hash,NULL);
 355 #ifndef OPENSSL_NO_COMP
 356                 if (s->compress != NULL)
 357                         {
 358                         COMP_CTX_free(s->compress);
 359                         s->compress=NULL;
 360                         }
 361                 if (comp != NULL)
 362                         {
 363                         s->compress=COMP_CTX_new(comp->method);
 364                         if (s->compress == NULL)
 365                                 {
 366                                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR);
 367                                 goto err2;
 368                                 }
 369                         }
 370 #endif
 371                 /* this is done by dtls1_reset_seq_numbers for DTLS1_VERSION */
 372                 if (s->version != DTLS1_VERSION)
 373                         memset(&(s->s3->write_sequence[0]),0,8);
 374                 mac_secret= &(s->s3->write_mac_secret[0]);
 375                 mac_secret_size = &(s->s3->write_mac_secret_size);
 376                 }
 377
 378         if (reuse_dd)
 379                 EVP_CIPHER_CTX_cleanup(dd);
 380
 381         p=s->s3->tmp.key_block;
 382         i=*mac_secret_size=s->s3->tmp.new_mac_secret_size;
 383
 384         cl=EVP_CIPHER_key_length(c);
 385         j=is_export ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
 386                        cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
 387         /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 388         k=EVP_CIPHER_iv_length(c);
 389         er1= &(s->s3->client_random[0]);
 390         er2= &(s->s3->server_random[0]);
 391         if (    (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 392                 (which == SSL3_CHANGE_CIPHER_SERVER_READ))
 393                 {
 394                 ms=  &(p[ 0]); n=i+i;
 395                 key= &(p[ n]); n+=j+j;
 396                 iv=  &(p[ n]); n+=k+k;
 397                 exp_label=(unsigned char *)TLS_MD_CLIENT_WRITE_KEY_CONST;
 398                 exp_label_len=TLS_MD_CLIENT_WRITE_KEY_CONST_SIZE;
 399                 client_write=1;
 400                 }
 401         else
 402                 {
 403                 n=i;
 404                 ms=  &(p[ n]); n+=i+j;
 405                 key= &(p[ n]); n+=j+k;
 406                 iv=  &(p[ n]); n+=k;
 407                 exp_label=(unsigned char *)TLS_MD_SERVER_WRITE_KEY_CONST;
 408                 exp_label_len=TLS_MD_SERVER_WRITE_KEY_CONST_SIZE;
 409                 client_write=0;
 410                 }
 411
 412         if (n > s->s3->tmp.key_block_length)
 413                 {
 414                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR);
 415                 goto err2;
 416                 }
 417
 418         memcpy(mac_secret,ms,i);
 419         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,
 420                         mac_secret,*mac_secret_size);
 421         EVP_DigestSignInit(mac_ctx,NULL,m,NULL,mac_key);
 422         EVP_PKEY_free(mac_key);
 423 #ifdef TLS_DEBUG
 424 printf("which = %04X\nmac key=",which);
 425 { int z; for (z=0; z<i; z++) printf("%02X%c",ms[z],((z+1)%16)?' ':'\n'); }
 426 #endif
 427         if (is_export)
 428                 {
 429                 /* In here I set both the read and write key/iv to the
 430                  * same value since only the correct one will be used :-).
 431                  */
 432                 p=buf;
 433                 memcpy(p,exp_label,exp_label_len);
 434                 p+=exp_label_len;
 435                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 436                 p+=SSL3_RANDOM_SIZE;
 437                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 438                 p+=SSL3_RANDOM_SIZE;
 439                 tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(p-buf),key,j,
 440                          tmp1,tmp2,EVP_CIPHER_key_length(c));
 441                 key=tmp1;
 442
 443                 if (k > 0)
 444                         {
 445                         p=buf;
 446                         memcpy(p,TLS_MD_IV_BLOCK_CONST,
 447                                 TLS_MD_IV_BLOCK_CONST_SIZE);
 448                         p+=TLS_MD_IV_BLOCK_CONST_SIZE;
 449                         memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 450                         p+=SSL3_RANDOM_SIZE;
 451                         memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 452                         p+=SSL3_RANDOM_SIZE;
 453                         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,p-buf,empty,0,
 454                                  iv1,iv2,k*2);
 455                         if (client_write)
 456                                 iv=iv1;
 457                         else
 458                                 iv= &(iv1[k]);
 459                         }
 460                 }
 461
 462         s->session->key_arg_length=0;
 463 #ifdef KSSL_DEBUG
 464         {
 465         int i;
 466         printf("EVP_CipherInit_ex(dd,c,key=,iv=,which)\n");
 467         printf("\tkey= "); for (i=0; i<c->key_len; i++) printf("%02x", key[i]);
 468         printf("\n");
 469         printf("\t iv= "); for (i=0; i<c->iv_len; i++) printf("%02x", iv[i]);
 470         printf("\n");
 471         }
 472 #endif  /* KSSL_DEBUG */
 473
 474         EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE));
 475 #ifdef TLS_DEBUG
 476 printf("which = %04X\nkey=",which);
 477 { int z; for (z=0; z<EVP_CIPHER_key_length(c); z++) printf("%02X%c",key[z],((z+1)%16)?' ':'\n'); }
 478 printf("\niv=");
 479 { int z; for (z=0; z<k; z++) printf("%02X%c",iv[z],((z+1)%16)?' ':'\n'); }
 480 printf("\n");
 481 #endif
 482
 483         OPENSSL_cleanse(tmp1,sizeof(tmp1));
 484         OPENSSL_cleanse(tmp2,sizeof(tmp1));
 485         OPENSSL_cleanse(iv1,sizeof(iv1));
 486         OPENSSL_cleanse(iv2,sizeof(iv2));
 487         return(1);
 488 err:
 489         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE);
 490 err2:
 491         return(0);
 492         }
 493
 494 int tls1_setup_key_block(SSL *s)
 495         {
 496         unsigned char *p1,*p2;
 497         const EVP_CIPHER *c;
 498         const EVP_MD *hash;
 499         int num;
 500         SSL_COMP *comp;
 501         int mac_type= NID_undef,mac_secret_size=0;
 502
 503 #ifdef KSSL_DEBUG
 504         printf ("tls1_setup_key_block()\n");
 505 #endif  /* KSSL_DEBUG */
 506
 507         if (s->s3->tmp.key_block_length != 0)
 508                 return(1);
 509
 510         if (!ssl_cipher_get_evp(s->session,&c,&hash,&mac_type,&mac_secret_size,&comp))
 511                 {
 512                 SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 513                 return(0);
 514                 }
 515
 516         s->s3->tmp.new_sym_enc=c;
 517         s->s3->tmp.new_hash=hash;
 518         s->s3->tmp.new_mac_pkey_type = mac_type;
 519         s->s3->tmp.new_mac_secret_size = mac_secret_size;
 520         num=EVP_CIPHER_key_length(c)+mac_secret_size+EVP_CIPHER_iv_length(c);
 521         num*=2;
 522
 523         ssl3_cleanup_key_block(s);
 524
 525         if ((p1=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 526                 goto err;
 527         if ((p2=(unsigned char *)OPENSSL_malloc(num)) == NULL)
 528                 goto err;
 529
 530         s->s3->tmp.key_block_length=num;
 531         s->s3->tmp.key_block=p1;
 532
 533
 534 #ifdef TLS_DEBUG
 535 printf("client random\n");
 536 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->client_random[z],((z+1)%16)?' ':'\n'); }
 537 printf("server random\n");
 538 { int z; for (z=0; z<SSL3_RANDOM_SIZE; z++) printf("%02X%c",s->s3->server_random[z],((z+1)%16)?' ':'\n'); }
 539 printf("pre-master\n");
 540 { int z; for (z=0; z<s->session->master_key_length; z++) printf("%02X%c",s->session->master_key[z],((z+1)%16)?' ':'\n'); }
 541 #endif
 542         tls1_generate_key_block(s,p1,p2,num);
 543         OPENSSL_cleanse(p2,num);
 544         OPENSSL_free(p2);
 545 #ifdef TLS_DEBUG
 546 printf("\nkey block\n");
 547 { int z; for (z=0; z<num; z++) printf("%02X%c",p1[z],((z+1)%16)?' ':'\n'); }
 548 #endif
 549
 550         if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
 551                 {
 552                 /* enable vulnerability countermeasure for CBC ciphers with
 553                  * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 554                  */
 555                 s->s3->need_empty_fragments = 1;
 556
 557                 if (s->session->cipher != NULL)
 558                         {
 559                         if (s->session->cipher->algorithm_enc == SSL_eNULL)
 560                                 s->s3->need_empty_fragments = 0;
 561
 562 #ifndef OPENSSL_NO_RC4
 563                         if (s->session->cipher->algorithm_enc == SSL_RC4)
 564                                 s->s3->need_empty_fragments = 0;
 565 #endif
 566                         }
 567                 }
 568
 569         return(1);
 570 err:
 571         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE);
 572         return(0);
 573         }
 574
 575 int tls1_enc(SSL *s, int send)
 576         {
 577         SSL3_RECORD *rec;
 578         EVP_CIPHER_CTX *ds;
 579         unsigned long l;
 580         int bs,i,ii,j,k,n=0;
 581         const EVP_CIPHER *enc;
 582
 583         if (send)
 584                 {
 585                 if (EVP_MD_CTX_md(s->write_hash))
 586                         n=EVP_MD_CTX_size(s->write_hash);
 587                 ds=s->enc_write_ctx;
 588                 rec= &(s->s3->wrec);
 589                 if (s->enc_write_ctx == NULL)
 590                         enc=NULL;
 591                 else
 592                         enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
 593                 }
 594         else
 595                 {
 596                 if (EVP_MD_CTX_md(s->read_hash))
 597                         n=EVP_MD_CTX_size(s->read_hash);
 598                 ds=s->enc_read_ctx;
 599                 rec= &(s->s3->rrec);
 600                 if (s->enc_read_ctx == NULL)
 601                         enc=NULL;
 602                 else
 603                         enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
 604                 }
 605
 606 #ifdef KSSL_DEBUG
 607         printf("tls1_enc(%d)\n", send);
 608 #endif    /* KSSL_DEBUG */
 609
 610         if ((s->session == NULL) || (ds == NULL) ||
 611                 (enc == NULL))
 612                 {
 613                 memmove(rec->data,rec->input,rec->length);
 614                 rec->input=rec->data;
 615                 }
 616         else
 617                 {
 618                 l=rec->length;
 619                 bs=EVP_CIPHER_block_size(ds->cipher);
 620
 621                 if ((bs != 1) && send)
 622                         {
 623                         i=bs-((int)l%bs);
 624
 625                         /* Add weird padding of upto 256 bytes */
 626
 627                         /* we need to add 'i' padding bytes of value j */
 628                         j=i-1;
 629                         if (s->options & SSL_OP_TLS_BLOCK_PADDING_BUG)
 630                                 {
 631                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 632                                         j++;
 633                                 }
 634                         for (k=(int)l; k<(int)(l+i); k++)
 635                                 rec->input[k]=j;
 636                         l+=i;
 637                         rec->length+=i;
 638                         }
 639
 640 #ifdef KSSL_DEBUG
 641                 {
 642                 unsigned long ui;
 643                 printf("EVP_Cipher(ds=%p,rec->data=%p,rec->input=%p,l=%ld) ==>\n",
 644                         ds,rec->data,rec->input,l);
 645                 printf("\tEVP_CIPHER_CTX: %d buf_len, %d key_len [%d %d], %d iv_len\n",
 646                         ds->buf_len, ds->cipher->key_len,
 647                         DES_KEY_SZ, DES_SCHEDULE_SZ,
 648                         ds->cipher->iv_len);
 649                 printf("\t\tIV: ");
 650                 for (i=0; i<ds->cipher->iv_len; i++) printf("%02X", ds->iv[i]);
 651                 printf("\n");
 652                 printf("\trec->input=");
 653                 for (ui=0; ui<l; ui++) printf(" %02x", rec->input[ui]);
 654                 printf("\n");
 655                 }
 656 #endif  /* KSSL_DEBUG */
 657
 658                 if (!send)
 659                         {
 660                         if (l == 0 || l%bs != 0)
 661                                 {
 662                                 SSLerr(SSL_F_TLS1_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
 663                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
 664                                 return 0;
 665                                 }
 666                         }
 667
 668                 EVP_Cipher(ds,rec->data,rec->input,l);
 669
 670 #ifdef KSSL_DEBUG
 671                 {
 672                 unsigned long i;
 673                 printf("\trec->data=");
 674                 for (i=0; i<l; i++)
 675                         printf(" %02x", rec->data[i]);  printf("\n");
 676                 }
 677 #endif  /* KSSL_DEBUG */
 678
 679                 if ((bs != 1) && !send)
 680                         {
 681                         ii=i=rec->data[l-1]; /* padding_length */
 682                         i++;
 683                         /* NB: if compression is in operation the first packet
 684                          * may not be of even length so the padding bug check
 685                          * cannot be performed. This bug workaround has been
 686                          * around since SSLeay so hopefully it is either fixed
 687                          * now or no buggy implementation supports compression
 688                          * [steve]
 689                          */
 690                         if ( (s->options&SSL_OP_TLS_BLOCK_PADDING_BUG)
 691                                 && !s->expand)
 692                                 {
 693                                 /* First packet is even in size, so check */
 694                                 if ((memcmp(s->s3->read_sequence,
 695                                         "\0\0\0\0\0\0\0\0",8) == 0) && !(ii & 1))
 696                                         s->s3->flags|=TLS1_FLAGS_TLS_PADDING_BUG;
 697                                 if (s->s3->flags & TLS1_FLAGS_TLS_PADDING_BUG)
 698                                         i--;
 699                                 }
 700                         /* TLS 1.0 does not bound the number of padding bytes by the block size.
 701                          * All of them must have value 'padding_length'. */
 702                         if (i > (int)rec->length)
 703                                 {
 704                                 /* Incorrect padding. SSLerr() and ssl3_alert are done
 705                                  * by caller: we don't want to reveal whether this is
 706                                  * a decryption error or a MAC verification failure
 707                                  * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
 708                                 return -1;
 709                                 }
 710                         for (j=(int)(l-i); j<(int)l; j++)
 711                                 {
 712                                 if (rec->data[j] != ii)
 713                                         {
 714                                         /* Incorrect padding */
 715                                         return -1;
 716                                         }
 717                                 }
 718                         rec->length-=i;
 719                         }
 720                 }
 721         return(1);
 722         }
 723
 724 int tls1_cert_verify_mac(SSL *s, EVP_MD_CTX *in_ctx, unsigned char *out)
 725         {
 726         unsigned int ret;
 727         EVP_MD_CTX ctx;
 728
 729         EVP_MD_CTX_init(&ctx);
 730         EVP_MD_CTX_copy_ex(&ctx,in_ctx);
 731         EVP_DigestFinal_ex(&ctx,out,&ret);
 732         EVP_MD_CTX_cleanup(&ctx);
 733         return((int)ret);
 734         }
 735
 736 int tls1_final_finish_mac(SSL *s, EVP_MD_CTX *in1_ctx, EVP_MD_CTX *in2_ctx,
 737              const char *str, int slen, unsigned char *out)
 738         {
 739         unsigned int i;
 740         EVP_MD_CTX ctx;
 741         unsigned char buf[TLS_MD_MAX_CONST_SIZE+MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 742         unsigned char *q,buf2[12];
 743
 744         q=buf;
 745         memcpy(q,str,slen);
 746         q+=slen;
 747
 748         EVP_MD_CTX_init(&ctx);
 749         EVP_MD_CTX_copy_ex(&ctx,in1_ctx);
 750         EVP_DigestFinal_ex(&ctx,q,&i);
 751         q+=i;
 752         EVP_MD_CTX_copy_ex(&ctx,in2_ctx);
 753         EVP_DigestFinal_ex(&ctx,q,&i);
 754         q+=i;
 755
 756         tls1_PRF(s->ctx->md5,s->ctx->sha1,buf,(int)(q-buf),
 757                 s->session->master_key,s->session->master_key_length,
 758                 out,buf2,sizeof buf2);
 759         EVP_MD_CTX_cleanup(&ctx);
 760
 761         return sizeof buf2;
 762         }
 763
 764 int tls1_mac(SSL *ssl, unsigned char *md, int send)
 765         {
 766         SSL3_RECORD *rec;
 767         unsigned char *mac_sec,*seq;
 768         EVP_MD_CTX *hash;
 769         size_t md_size;
 770         int i;
 771         EVP_MD_CTX hmac, *mac_ctx;
 772         unsigned char buf[5];
 773         int stream_mac = (send?(ssl->mac_flags & SSL_MAC_FLAG_WRITE_MAC_STREAM):(ssl->mac_flags&SSL_MAC_FLAG_READ_MAC_STREAM));
 774         if (send)
 775                 {
 776                 rec= &(ssl->s3->wrec);
 777                 mac_sec= &(ssl->s3->write_mac_secret[0]);
 778                 seq= &(ssl->s3->write_sequence[0]);
 779                 hash=ssl->write_hash;
 780                 }
 781         else
 782                 {
 783                 rec= &(ssl->s3->rrec);
 784                 mac_sec= &(ssl->s3->read_mac_secret[0]);
 785                 seq= &(ssl->s3->read_sequence[0]);
 786                 hash=ssl->read_hash;
 787                 }
 788
 789         md_size=EVP_MD_CTX_size(hash);
 790
 791         buf[0]=rec->type;
 792         buf[1]=TLS1_VERSION_MAJOR;
 793         buf[2]=TLS1_VERSION_MINOR;
 794         buf[3]=rec->length>>8;
 795         buf[4]=rec->length&0xff;
 796
 797         /* I should fix this up TLS TLS TLS TLS TLS XXXXXXXX */
 798         if (stream_mac)
 799                 {
 800                         mac_ctx = hash;
 801                 }
 802                 else
 803                 {
 804                         EVP_MD_CTX_copy(&hmac,hash);
 805                         mac_ctx = &hmac;
 806                 }
 807         EVP_DigestSignUpdate(mac_ctx,seq,8);
 808         EVP_DigestSignUpdate(mac_ctx,buf,5);
 809         EVP_DigestSignUpdate(mac_ctx,rec->input,rec->length);
 810         if (stream_mac) EVP_MD_CTX_copy(&hmac,hash);
 811         EVP_DigestSignFinal(&hmac,md,&md_size);
 812         EVP_MD_CTX_cleanup(&hmac);
 813 #ifdef TLS_DEBUG
 814 printf("sec=");
 815 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",mac_sec[z]); printf("\n"); }
 816 printf("seq=");
 817 {int z; for (z=0; z<8; z++) printf("%02X ",seq[z]); printf("\n"); }
 818 printf("buf=");
 819 {int z; for (z=0; z<5; z++) printf("%02X ",buf[z]); printf("\n"); }
 820 printf("rec=");
 821 {unsigned int z; for (z=0; z<rec->length; z++) printf("%02X ",buf[z]); printf("\n"); }
 822 #endif
 823
 824     if ( SSL_version(ssl) != DTLS1_VERSION)
 825             {
 826                 for (i=7; i>=0; i--)
 827                         {
 828                         ++seq[i];
 829                         if (seq[i] != 0) break;
 830                         }
 831                 }
 832
 833 #ifdef TLS_DEBUG
 834 {unsigned int z; for (z=0; z<md_size; z++) printf("%02X ",md[z]); printf("\n"); }
 835 #endif
 836         return(md_size);
 837         }
 838
 839 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 840              int len)
 841         {
 842         unsigned char buf[SSL3_RANDOM_SIZE*2+TLS_MD_MASTER_SECRET_CONST_SIZE];
 843         unsigned char buff[SSL_MAX_MASTER_KEY_LENGTH];
 844
 845 #ifdef KSSL_DEBUG
 846         printf ("tls1_generate_master_secret(%p,%p, %p, %d)\n", s,out, p,len);
 847 #endif  /* KSSL_DEBUG */
 848
 849         /* Setup the stuff to munge */
 850         memcpy(buf,TLS_MD_MASTER_SECRET_CONST,
 851                 TLS_MD_MASTER_SECRET_CONST_SIZE);
 852         memcpy(&(buf[TLS_MD_MASTER_SECRET_CONST_SIZE]),
 853                 s->s3->client_random,SSL3_RANDOM_SIZE);
 854         memcpy(&(buf[SSL3_RANDOM_SIZE+TLS_MD_MASTER_SECRET_CONST_SIZE]),
 855                 s->s3->server_random,SSL3_RANDOM_SIZE);
 856         tls1_PRF(s->ctx->md5,s->ctx->sha1,
 857                 buf,TLS_MD_MASTER_SECRET_CONST_SIZE+SSL3_RANDOM_SIZE*2,p,len,
 858                 s->session->master_key,buff,sizeof buff);
 859 #ifdef KSSL_DEBUG
 860         printf ("tls1_generate_master_secret() complete\n");
 861 #endif  /* KSSL_DEBUG */
 862         return(SSL3_MASTER_SECRET_SIZE);
 863         }
 864
 865 int tls1_alert_code(int code)
 866         {
 867         switch (code)
 868                 {
 869         case SSL_AD_CLOSE_NOTIFY:       return(SSL3_AD_CLOSE_NOTIFY);
 870         case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE);
 871         case SSL_AD_BAD_RECORD_MAC:     return(SSL3_AD_BAD_RECORD_MAC);
 872         case SSL_AD_DECRYPTION_FAILED:  return(TLS1_AD_DECRYPTION_FAILED);
 873         case SSL_AD_RECORD_OVERFLOW:    return(TLS1_AD_RECORD_OVERFLOW);
 874         case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE);
 875         case SSL_AD_HANDSHAKE_FAILURE:  return(SSL3_AD_HANDSHAKE_FAILURE);
 876         case SSL_AD_NO_CERTIFICATE:     return(-1);
 877         case SSL_AD_BAD_CERTIFICATE:    return(SSL3_AD_BAD_CERTIFICATE);
 878         case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE);
 879         case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED);
 880         case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED);
 881         case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN);
 882         case SSL_AD_ILLEGAL_PARAMETER:  return(SSL3_AD_ILLEGAL_PARAMETER);
 883         case SSL_AD_UNKNOWN_CA:         return(TLS1_AD_UNKNOWN_CA);
 884         case SSL_AD_ACCESS_DENIED:      return(TLS1_AD_ACCESS_DENIED);
 885         case SSL_AD_DECODE_ERROR:       return(TLS1_AD_DECODE_ERROR);
 886         case SSL_AD_DECRYPT_ERROR:      return(TLS1_AD_DECRYPT_ERROR);
 887         case SSL_AD_EXPORT_RESTRICTION: return(TLS1_AD_EXPORT_RESTRICTION);
 888         case SSL_AD_PROTOCOL_VERSION:   return(TLS1_AD_PROTOCOL_VERSION);
 889         case SSL_AD_INSUFFICIENT_SECURITY:return(TLS1_AD_INSUFFICIENT_SECURITY);
 890         case SSL_AD_INTERNAL_ERROR:     return(TLS1_AD_INTERNAL_ERROR);
 891         case SSL_AD_USER_CANCELLED:     return(TLS1_AD_USER_CANCELLED);
 892         case SSL_AD_NO_RENEGOTIATION:   return(TLS1_AD_NO_RENEGOTIATION);
 893         case SSL_AD_UNSUPPORTED_EXTENSION: return(TLS1_AD_UNSUPPORTED_EXTENSION);
 894         case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(TLS1_AD_CERTIFICATE_UNOBTAINABLE);
 895         case SSL_AD_UNRECOGNIZED_NAME:  return(TLS1_AD_UNRECOGNIZED_NAME);
 896         case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE);
 897         case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(TLS1_AD_BAD_CERTIFICATE_HASH_VALUE);
 898         case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY);
 899 #if 0 /* not appropriate for TLS, not used for DTLS */
 900         case DTLS1_AD_MISSING_HANDSHAKE_MESSAGE: return
 901                                           (DTLS1_AD_MISSING_HANDSHAKE_MESSAGE);
 902 #endif
 903         default:                        return(-1);
 904                 }
 905         }
 906