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