Kinson Chik | a8fa74c | 2011-07-29 11:33:41 -0700 | [diff] [blame] | 1 | /* ssl/s3_enc.c */ |
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This package is an SSL implementation written |
| 6 | * by Eric Young (eay@cryptsoft.com). |
| 7 | * The implementation was written so as to conform with Netscapes SSL. |
| 8 | * |
| 9 | * This library is free for commercial and non-commercial use as long as |
| 10 | * the following conditions are aheared to. The following conditions |
| 11 | * apply to all code found in this distribution, be it the RC4, RSA, |
| 12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| 13 | * included with this distribution is covered by the same copyright terms |
| 14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| 15 | * |
| 16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
| 17 | * the code are not to be removed. |
| 18 | * If this package is used in a product, Eric Young should be given attribution |
| 19 | * as the author of the parts of the library used. |
| 20 | * This can be in the form of a textual message at program startup or |
| 21 | * in documentation (online or textual) provided with the package. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * 1. Redistributions of source code must retain the copyright |
| 27 | * notice, this list of conditions and the following disclaimer. |
| 28 | * 2. Redistributions in binary form must reproduce the above copyright |
| 29 | * notice, this list of conditions and the following disclaimer in the |
| 30 | * documentation and/or other materials provided with the distribution. |
| 31 | * 3. All advertising materials mentioning features or use of this software |
| 32 | * must display the following acknowledgement: |
| 33 | * "This product includes cryptographic software written by |
| 34 | * Eric Young (eay@cryptsoft.com)" |
| 35 | * The word 'cryptographic' can be left out if the rouines from the library |
| 36 | * being used are not cryptographic related :-). |
| 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
| 38 | * the apps directory (application code) you must include an acknowledgement: |
| 39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| 40 | * |
| 41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| 42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 51 | * SUCH DAMAGE. |
| 52 | * |
| 53 | * The licence and distribution terms for any publically available version or |
| 54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
| 55 | * copied and put under another distribution licence |
| 56 | * [including the GNU Public Licence.] |
| 57 | */ |
| 58 | /* ==================================================================== |
| 59 | * Copyright (c) 1998-2007 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/evp.h> |
| 141 | #include <openssl/md5.h> |
| 142 | |
| 143 | static unsigned char ssl3_pad_1[48]={ |
| 144 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
| 145 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
| 146 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
| 147 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
| 148 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36, |
| 149 | 0x36,0x36,0x36,0x36,0x36,0x36,0x36,0x36 }; |
| 150 | |
| 151 | static unsigned char ssl3_pad_2[48]={ |
| 152 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
| 153 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
| 154 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
| 155 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
| 156 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c, |
| 157 | 0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c,0x5c }; |
| 158 | static int ssl3_handshake_mac(SSL *s, int md_nid, |
| 159 | const char *sender, int len, unsigned char *p); |
| 160 | static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) |
| 161 | { |
| 162 | EVP_MD_CTX m5; |
| 163 | EVP_MD_CTX s1; |
| 164 | unsigned char buf[16],smd[SHA_DIGEST_LENGTH]; |
| 165 | unsigned char c='A'; |
| 166 | unsigned int i,j,k; |
| 167 | |
| 168 | #ifdef CHARSET_EBCDIC |
| 169 | c = os_toascii[c]; /*'A' in ASCII */ |
| 170 | #endif |
| 171 | k=0; |
| 172 | EVP_MD_CTX_init(&m5); |
| 173 | EVP_MD_CTX_init(&s1); |
| 174 | for (i=0; (int)i<num; i+=MD5_DIGEST_LENGTH) |
| 175 | { |
| 176 | k++; |
| 177 | if (k > sizeof buf) |
| 178 | { |
| 179 | /* bug: 'buf' is too small for this ciphersuite */ |
| 180 | SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | for (j=0; j<k; j++) |
| 185 | buf[j]=c; |
| 186 | c++; |
| 187 | EVP_DigestInit_ex(&s1,EVP_sha1(), NULL); |
| 188 | EVP_DigestUpdate(&s1,buf,k); |
| 189 | EVP_DigestUpdate(&s1,s->session->master_key, |
| 190 | s->session->master_key_length); |
| 191 | EVP_DigestUpdate(&s1,s->s3->server_random,SSL3_RANDOM_SIZE); |
| 192 | EVP_DigestUpdate(&s1,s->s3->client_random,SSL3_RANDOM_SIZE); |
| 193 | EVP_DigestFinal_ex(&s1,smd,NULL); |
| 194 | |
| 195 | EVP_DigestInit_ex(&m5,EVP_md5(), NULL); |
| 196 | EVP_DigestUpdate(&m5,s->session->master_key, |
| 197 | s->session->master_key_length); |
| 198 | EVP_DigestUpdate(&m5,smd,SHA_DIGEST_LENGTH); |
| 199 | if ((int)(i+MD5_DIGEST_LENGTH) > num) |
| 200 | { |
| 201 | EVP_DigestFinal_ex(&m5,smd,NULL); |
| 202 | memcpy(km,smd,(num-i)); |
| 203 | } |
| 204 | else |
| 205 | EVP_DigestFinal_ex(&m5,km,NULL); |
| 206 | |
| 207 | km+=MD5_DIGEST_LENGTH; |
| 208 | } |
| 209 | OPENSSL_cleanse(smd,SHA_DIGEST_LENGTH); |
| 210 | EVP_MD_CTX_cleanup(&m5); |
| 211 | EVP_MD_CTX_cleanup(&s1); |
| 212 | return 1; |
| 213 | } |
| 214 | |
| 215 | int ssl3_change_cipher_state(SSL *s, int which) |
| 216 | { |
| 217 | unsigned char *p,*key_block,*mac_secret; |
| 218 | unsigned char exp_key[EVP_MAX_KEY_LENGTH]; |
| 219 | unsigned char exp_iv[EVP_MAX_IV_LENGTH]; |
| 220 | unsigned char *ms,*key,*iv,*er1,*er2; |
| 221 | EVP_CIPHER_CTX *dd; |
| 222 | const EVP_CIPHER *c; |
| 223 | #ifndef OPENSSL_NO_COMP |
| 224 | COMP_METHOD *comp; |
| 225 | #endif |
| 226 | const EVP_MD *m; |
| 227 | EVP_MD_CTX md; |
| 228 | int is_exp,n,i,j,k,cl; |
| 229 | int reuse_dd = 0; |
| 230 | |
| 231 | is_exp=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); |
| 232 | c=s->s3->tmp.new_sym_enc; |
| 233 | m=s->s3->tmp.new_hash; |
| 234 | /* m == NULL will lead to a crash later */ |
| 235 | OPENSSL_assert(m); |
| 236 | #ifndef OPENSSL_NO_COMP |
| 237 | if (s->s3->tmp.new_compression == NULL) |
| 238 | comp=NULL; |
| 239 | else |
| 240 | comp=s->s3->tmp.new_compression->method; |
| 241 | #endif |
| 242 | key_block=s->s3->tmp.key_block; |
| 243 | |
| 244 | if (which & SSL3_CC_READ) |
| 245 | { |
| 246 | if (s->enc_read_ctx != NULL) |
| 247 | reuse_dd = 1; |
| 248 | else if ((s->enc_read_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) |
| 249 | goto err; |
| 250 | else |
| 251 | /* make sure it's intialized in case we exit later with an error */ |
| 252 | EVP_CIPHER_CTX_init(s->enc_read_ctx); |
| 253 | dd= s->enc_read_ctx; |
| 254 | |
| 255 | ssl_replace_hash(&s->read_hash,m); |
| 256 | #ifndef OPENSSL_NO_COMP |
| 257 | /* COMPRESS */ |
| 258 | if (s->expand != NULL) |
| 259 | { |
| 260 | COMP_CTX_free(s->expand); |
| 261 | s->expand=NULL; |
| 262 | } |
| 263 | if (comp != NULL) |
| 264 | { |
| 265 | s->expand=COMP_CTX_new(comp); |
| 266 | if (s->expand == NULL) |
| 267 | { |
| 268 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); |
| 269 | goto err2; |
| 270 | } |
| 271 | if (s->s3->rrec.comp == NULL) |
| 272 | s->s3->rrec.comp=(unsigned char *) |
| 273 | OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); |
| 274 | if (s->s3->rrec.comp == NULL) |
| 275 | goto err; |
| 276 | } |
| 277 | #endif |
| 278 | memset(&(s->s3->read_sequence[0]),0,8); |
| 279 | mac_secret= &(s->s3->read_mac_secret[0]); |
| 280 | } |
| 281 | else |
| 282 | { |
| 283 | if (s->enc_write_ctx != NULL) |
| 284 | reuse_dd = 1; |
| 285 | else if ((s->enc_write_ctx=OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) |
| 286 | goto err; |
| 287 | else |
| 288 | /* make sure it's intialized in case we exit later with an error */ |
| 289 | EVP_CIPHER_CTX_init(s->enc_write_ctx); |
| 290 | dd= s->enc_write_ctx; |
| 291 | ssl_replace_hash(&s->write_hash,m); |
| 292 | #ifndef OPENSSL_NO_COMP |
| 293 | /* COMPRESS */ |
| 294 | if (s->compress != NULL) |
| 295 | { |
| 296 | COMP_CTX_free(s->compress); |
| 297 | s->compress=NULL; |
| 298 | } |
| 299 | if (comp != NULL) |
| 300 | { |
| 301 | s->compress=COMP_CTX_new(comp); |
| 302 | if (s->compress == NULL) |
| 303 | { |
| 304 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,SSL_R_COMPRESSION_LIBRARY_ERROR); |
| 305 | goto err2; |
| 306 | } |
| 307 | } |
| 308 | #endif |
| 309 | memset(&(s->s3->write_sequence[0]),0,8); |
| 310 | mac_secret= &(s->s3->write_mac_secret[0]); |
| 311 | } |
| 312 | |
| 313 | if (reuse_dd) |
| 314 | EVP_CIPHER_CTX_cleanup(dd); |
| 315 | |
| 316 | p=s->s3->tmp.key_block; |
| 317 | i=EVP_MD_size(m); |
| 318 | if (i < 0) |
| 319 | goto err2; |
| 320 | cl=EVP_CIPHER_key_length(c); |
| 321 | j=is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? |
| 322 | cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; |
| 323 | /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ |
| 324 | k=EVP_CIPHER_iv_length(c); |
| 325 | if ( (which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || |
| 326 | (which == SSL3_CHANGE_CIPHER_SERVER_READ)) |
| 327 | { |
| 328 | ms= &(p[ 0]); n=i+i; |
| 329 | key= &(p[ n]); n+=j+j; |
| 330 | iv= &(p[ n]); n+=k+k; |
| 331 | er1= &(s->s3->client_random[0]); |
| 332 | er2= &(s->s3->server_random[0]); |
| 333 | } |
| 334 | else |
| 335 | { |
| 336 | n=i; |
| 337 | ms= &(p[ n]); n+=i+j; |
| 338 | key= &(p[ n]); n+=j+k; |
| 339 | iv= &(p[ n]); n+=k; |
| 340 | er1= &(s->s3->server_random[0]); |
| 341 | er2= &(s->s3->client_random[0]); |
| 342 | } |
| 343 | |
| 344 | if (n > s->s3->tmp.key_block_length) |
| 345 | { |
| 346 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_INTERNAL_ERROR); |
| 347 | goto err2; |
| 348 | } |
| 349 | |
| 350 | EVP_MD_CTX_init(&md); |
| 351 | memcpy(mac_secret,ms,i); |
| 352 | if (is_exp) |
| 353 | { |
| 354 | /* In here I set both the read and write key/iv to the |
| 355 | * same value since only the correct one will be used :-). |
| 356 | */ |
| 357 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); |
| 358 | EVP_DigestUpdate(&md,key,j); |
| 359 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); |
| 360 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); |
| 361 | EVP_DigestFinal_ex(&md,&(exp_key[0]),NULL); |
| 362 | key= &(exp_key[0]); |
| 363 | |
| 364 | if (k > 0) |
| 365 | { |
| 366 | EVP_DigestInit_ex(&md,EVP_md5(), NULL); |
| 367 | EVP_DigestUpdate(&md,er1,SSL3_RANDOM_SIZE); |
| 368 | EVP_DigestUpdate(&md,er2,SSL3_RANDOM_SIZE); |
| 369 | EVP_DigestFinal_ex(&md,&(exp_iv[0]),NULL); |
| 370 | iv= &(exp_iv[0]); |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | s->session->key_arg_length=0; |
| 375 | |
| 376 | EVP_CipherInit_ex(dd,c,NULL,key,iv,(which & SSL3_CC_WRITE)); |
| 377 | |
| 378 | OPENSSL_cleanse(&(exp_key[0]),sizeof(exp_key)); |
| 379 | OPENSSL_cleanse(&(exp_iv[0]),sizeof(exp_iv)); |
| 380 | EVP_MD_CTX_cleanup(&md); |
| 381 | return(1); |
| 382 | err: |
| 383 | SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,ERR_R_MALLOC_FAILURE); |
| 384 | err2: |
| 385 | return(0); |
| 386 | } |
| 387 | |
| 388 | int ssl3_setup_key_block(SSL *s) |
| 389 | { |
| 390 | unsigned char *p; |
| 391 | const EVP_CIPHER *c; |
| 392 | const EVP_MD *hash; |
| 393 | int num; |
| 394 | int ret = 0; |
| 395 | SSL_COMP *comp; |
| 396 | |
| 397 | if (s->s3->tmp.key_block_length != 0) |
| 398 | return(1); |
| 399 | |
| 400 | if (!ssl_cipher_get_evp(s->session,&c,&hash,NULL,NULL,&comp)) |
| 401 | { |
| 402 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,SSL_R_CIPHER_OR_HASH_UNAVAILABLE); |
| 403 | return(0); |
| 404 | } |
| 405 | |
| 406 | s->s3->tmp.new_sym_enc=c; |
| 407 | s->s3->tmp.new_hash=hash; |
| 408 | #ifdef OPENSSL_NO_COMP |
| 409 | s->s3->tmp.new_compression=NULL; |
| 410 | #else |
| 411 | s->s3->tmp.new_compression=comp; |
| 412 | #endif |
| 413 | |
| 414 | num=EVP_MD_size(hash); |
| 415 | if (num < 0) |
| 416 | return 0; |
| 417 | |
| 418 | num=EVP_CIPHER_key_length(c)+num+EVP_CIPHER_iv_length(c); |
| 419 | num*=2; |
| 420 | |
| 421 | ssl3_cleanup_key_block(s); |
| 422 | |
| 423 | if ((p=OPENSSL_malloc(num)) == NULL) |
| 424 | goto err; |
| 425 | |
| 426 | s->s3->tmp.key_block_length=num; |
| 427 | s->s3->tmp.key_block=p; |
| 428 | |
| 429 | ret = ssl3_generate_key_block(s,p,num); |
| 430 | |
| 431 | if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) |
| 432 | { |
| 433 | /* enable vulnerability countermeasure for CBC ciphers with |
| 434 | * known-IV problem (http://www.openssl.org/~bodo/tls-cbc.txt) |
| 435 | */ |
| 436 | s->s3->need_empty_fragments = 1; |
| 437 | |
| 438 | if (s->session->cipher != NULL) |
| 439 | { |
| 440 | if (s->session->cipher->algorithm_enc == SSL_eNULL) |
| 441 | s->s3->need_empty_fragments = 0; |
| 442 | |
| 443 | #ifndef OPENSSL_NO_RC4 |
| 444 | if (s->session->cipher->algorithm_enc == SSL_RC4) |
| 445 | s->s3->need_empty_fragments = 0; |
| 446 | #endif |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | return ret; |
| 451 | |
| 452 | err: |
| 453 | SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK,ERR_R_MALLOC_FAILURE); |
| 454 | return(0); |
| 455 | } |
| 456 | |
| 457 | void ssl3_cleanup_key_block(SSL *s) |
| 458 | { |
| 459 | if (s->s3->tmp.key_block != NULL) |
| 460 | { |
| 461 | OPENSSL_cleanse(s->s3->tmp.key_block, |
| 462 | s->s3->tmp.key_block_length); |
| 463 | OPENSSL_free(s->s3->tmp.key_block); |
| 464 | s->s3->tmp.key_block=NULL; |
| 465 | } |
| 466 | s->s3->tmp.key_block_length=0; |
| 467 | } |
| 468 | |
| 469 | int ssl3_enc(SSL *s, int send) |
| 470 | { |
| 471 | SSL3_RECORD *rec; |
| 472 | EVP_CIPHER_CTX *ds; |
| 473 | unsigned long l; |
| 474 | int bs,i; |
| 475 | const EVP_CIPHER *enc; |
| 476 | |
| 477 | if (send) |
| 478 | { |
| 479 | ds=s->enc_write_ctx; |
| 480 | rec= &(s->s3->wrec); |
| 481 | if (s->enc_write_ctx == NULL) |
| 482 | enc=NULL; |
| 483 | else |
| 484 | enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx); |
| 485 | } |
| 486 | else |
| 487 | { |
| 488 | ds=s->enc_read_ctx; |
| 489 | rec= &(s->s3->rrec); |
| 490 | if (s->enc_read_ctx == NULL) |
| 491 | enc=NULL; |
| 492 | else |
| 493 | enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx); |
| 494 | } |
| 495 | |
| 496 | if ((s->session == NULL) || (ds == NULL) || |
| 497 | (enc == NULL)) |
| 498 | { |
| 499 | memmove(rec->data,rec->input,rec->length); |
| 500 | rec->input=rec->data; |
| 501 | } |
| 502 | else |
| 503 | { |
| 504 | l=rec->length; |
| 505 | bs=EVP_CIPHER_block_size(ds->cipher); |
| 506 | |
| 507 | /* COMPRESS */ |
| 508 | |
| 509 | if ((bs != 1) && send) |
| 510 | { |
| 511 | i=bs-((int)l%bs); |
| 512 | |
| 513 | /* we need to add 'i-1' padding bytes */ |
| 514 | l+=i; |
| 515 | rec->length+=i; |
| 516 | rec->input[l-1]=(i-1); |
| 517 | } |
| 518 | |
| 519 | if (!send) |
| 520 | { |
| 521 | if (l == 0 || l%bs != 0) |
| 522 | { |
| 523 | SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); |
| 524 | ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED); |
| 525 | return 0; |
| 526 | } |
| 527 | /* otherwise, rec->length >= bs */ |
| 528 | } |
| 529 | |
| 530 | EVP_Cipher(ds,rec->data,rec->input,l); |
| 531 | |
| 532 | if ((bs != 1) && !send) |
| 533 | { |
| 534 | i=rec->data[l-1]+1; |
| 535 | /* SSL 3.0 bounds the number of padding bytes by the block size; |
| 536 | * padding bytes (except the last one) are arbitrary */ |
| 537 | if (i > bs) |
| 538 | { |
| 539 | /* Incorrect padding. SSLerr() and ssl3_alert are done |
| 540 | * by caller: we don't want to reveal whether this is |
| 541 | * a decryption error or a MAC verification failure |
| 542 | * (see http://www.openssl.org/~bodo/tls-cbc.txt) */ |
| 543 | return -1; |
| 544 | } |
| 545 | /* now i <= bs <= rec->length */ |
| 546 | rec->length-=i; |
| 547 | } |
| 548 | } |
| 549 | return(1); |
| 550 | } |
| 551 | |
| 552 | void ssl3_init_finished_mac(SSL *s) |
| 553 | { |
| 554 | if (s->s3->handshake_buffer) BIO_free(s->s3->handshake_buffer); |
| 555 | if (s->s3->handshake_dgst) ssl3_free_digest_list(s); |
| 556 | s->s3->handshake_buffer=BIO_new(BIO_s_mem()); |
| 557 | (void)BIO_set_close(s->s3->handshake_buffer,BIO_CLOSE); |
| 558 | } |
| 559 | |
| 560 | void ssl3_free_digest_list(SSL *s) |
| 561 | { |
| 562 | int i; |
| 563 | if (!s->s3->handshake_dgst) return; |
| 564 | for (i=0;i<SSL_MAX_DIGEST;i++) |
| 565 | { |
| 566 | if (s->s3->handshake_dgst[i]) |
| 567 | EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]); |
| 568 | } |
| 569 | OPENSSL_free(s->s3->handshake_dgst); |
| 570 | s->s3->handshake_dgst=NULL; |
| 571 | } |
| 572 | |
| 573 | |
| 574 | |
| 575 | void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) |
| 576 | { |
| 577 | if (s->s3->handshake_buffer) |
| 578 | { |
| 579 | BIO_write (s->s3->handshake_buffer,(void *)buf,len); |
| 580 | } |
| 581 | else |
| 582 | { |
| 583 | int i; |
| 584 | for (i=0;i< SSL_MAX_DIGEST;i++) |
| 585 | { |
| 586 | if (s->s3->handshake_dgst[i]!= NULL) |
| 587 | EVP_DigestUpdate(s->s3->handshake_dgst[i],buf,len); |
| 588 | } |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | int ssl3_digest_cached_records(SSL *s) |
| 593 | { |
| 594 | int i; |
| 595 | long mask; |
| 596 | const EVP_MD *md; |
| 597 | long hdatalen; |
| 598 | void *hdata; |
| 599 | |
| 600 | /* Allocate handshake_dgst array */ |
| 601 | ssl3_free_digest_list(s); |
| 602 | s->s3->handshake_dgst = OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *)); |
| 603 | memset(s->s3->handshake_dgst,0,SSL_MAX_DIGEST *sizeof(EVP_MD_CTX *)); |
| 604 | hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,&hdata); |
| 605 | if (hdatalen <= 0) |
| 606 | { |
| 607 | SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH); |
| 608 | return 0; |
| 609 | } |
| 610 | |
| 611 | /* Loop through bitso of algorithm2 field and create MD_CTX-es */ |
| 612 | for (i=0;ssl_get_handshake_digest(i,&mask,&md); i++) |
| 613 | { |
| 614 | if ((mask & s->s3->tmp.new_cipher->algorithm2) && md) |
| 615 | { |
| 616 | s->s3->handshake_dgst[i]=EVP_MD_CTX_create(); |
| 617 | EVP_DigestInit_ex(s->s3->handshake_dgst[i],md,NULL); |
| 618 | EVP_DigestUpdate(s->s3->handshake_dgst[i],hdata,hdatalen); |
| 619 | } |
| 620 | else |
| 621 | { |
| 622 | s->s3->handshake_dgst[i]=NULL; |
| 623 | } |
| 624 | } |
| 625 | /* Free handshake_buffer BIO */ |
| 626 | BIO_free(s->s3->handshake_buffer); |
| 627 | s->s3->handshake_buffer = NULL; |
| 628 | |
| 629 | return 1; |
| 630 | } |
| 631 | |
| 632 | int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p) |
| 633 | { |
| 634 | return(ssl3_handshake_mac(s,md_nid,NULL,0,p)); |
| 635 | } |
| 636 | int ssl3_final_finish_mac(SSL *s, |
| 637 | const char *sender, int len, unsigned char *p) |
| 638 | { |
| 639 | int ret; |
| 640 | ret=ssl3_handshake_mac(s,NID_md5,sender,len,p); |
| 641 | p+=ret; |
| 642 | ret+=ssl3_handshake_mac(s,NID_sha1,sender,len,p); |
| 643 | return(ret); |
| 644 | } |
| 645 | static int ssl3_handshake_mac(SSL *s, int md_nid, |
| 646 | const char *sender, int len, unsigned char *p) |
| 647 | { |
| 648 | unsigned int ret; |
| 649 | int npad,n; |
| 650 | unsigned int i; |
| 651 | unsigned char md_buf[EVP_MAX_MD_SIZE]; |
| 652 | EVP_MD_CTX ctx,*d=NULL; |
| 653 | |
| 654 | if (s->s3->handshake_buffer) |
| 655 | if (!ssl3_digest_cached_records(s)) |
| 656 | return 0; |
| 657 | |
| 658 | /* Search for digest of specified type in the handshake_dgst |
| 659 | * array*/ |
| 660 | for (i=0;i<SSL_MAX_DIGEST;i++) |
| 661 | { |
| 662 | if (s->s3->handshake_dgst[i]&&EVP_MD_CTX_type(s->s3->handshake_dgst[i])==md_nid) |
| 663 | { |
| 664 | d=s->s3->handshake_dgst[i]; |
| 665 | break; |
| 666 | } |
| 667 | } |
| 668 | if (!d) { |
| 669 | SSLerr(SSL_F_SSL3_HANDSHAKE_MAC,SSL_R_NO_REQUIRED_DIGEST); |
| 670 | return 0; |
| 671 | } |
| 672 | EVP_MD_CTX_init(&ctx); |
| 673 | EVP_MD_CTX_copy_ex(&ctx,d); |
| 674 | n=EVP_MD_CTX_size(&ctx); |
| 675 | if (n < 0) |
| 676 | return 0; |
| 677 | |
| 678 | npad=(48/n)*n; |
| 679 | if (sender != NULL) |
| 680 | EVP_DigestUpdate(&ctx,sender,len); |
| 681 | EVP_DigestUpdate(&ctx,s->session->master_key, |
| 682 | s->session->master_key_length); |
| 683 | EVP_DigestUpdate(&ctx,ssl3_pad_1,npad); |
| 684 | EVP_DigestFinal_ex(&ctx,md_buf,&i); |
| 685 | |
| 686 | EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL); |
| 687 | EVP_DigestUpdate(&ctx,s->session->master_key, |
| 688 | s->session->master_key_length); |
| 689 | EVP_DigestUpdate(&ctx,ssl3_pad_2,npad); |
| 690 | EVP_DigestUpdate(&ctx,md_buf,i); |
| 691 | EVP_DigestFinal_ex(&ctx,p,&ret); |
| 692 | |
| 693 | EVP_MD_CTX_cleanup(&ctx); |
| 694 | |
| 695 | return((int)ret); |
| 696 | } |
| 697 | |
| 698 | int n_ssl3_mac(SSL *ssl, unsigned char *md, int send) |
| 699 | { |
| 700 | SSL3_RECORD *rec; |
| 701 | unsigned char *mac_sec,*seq; |
| 702 | EVP_MD_CTX md_ctx; |
| 703 | const EVP_MD_CTX *hash; |
| 704 | unsigned char *p,rec_char; |
| 705 | unsigned int md_size; |
| 706 | int npad; |
| 707 | int t; |
| 708 | |
| 709 | if (send) |
| 710 | { |
| 711 | rec= &(ssl->s3->wrec); |
| 712 | mac_sec= &(ssl->s3->write_mac_secret[0]); |
| 713 | seq= &(ssl->s3->write_sequence[0]); |
| 714 | hash=ssl->write_hash; |
| 715 | } |
| 716 | else |
| 717 | { |
| 718 | rec= &(ssl->s3->rrec); |
| 719 | mac_sec= &(ssl->s3->read_mac_secret[0]); |
| 720 | seq= &(ssl->s3->read_sequence[0]); |
| 721 | hash=ssl->read_hash; |
| 722 | } |
| 723 | |
| 724 | t=EVP_MD_CTX_size(hash); |
| 725 | if (t < 0) |
| 726 | return -1; |
| 727 | md_size=t; |
| 728 | npad=(48/md_size)*md_size; |
| 729 | |
| 730 | /* Chop the digest off the end :-) */ |
| 731 | EVP_MD_CTX_init(&md_ctx); |
| 732 | |
| 733 | EVP_MD_CTX_copy_ex( &md_ctx,hash); |
| 734 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); |
| 735 | EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad); |
| 736 | EVP_DigestUpdate(&md_ctx,seq,8); |
| 737 | rec_char=rec->type; |
| 738 | EVP_DigestUpdate(&md_ctx,&rec_char,1); |
| 739 | p=md; |
| 740 | s2n(rec->length,p); |
| 741 | EVP_DigestUpdate(&md_ctx,md,2); |
| 742 | EVP_DigestUpdate(&md_ctx,rec->input,rec->length); |
| 743 | EVP_DigestFinal_ex( &md_ctx,md,NULL); |
| 744 | |
| 745 | EVP_MD_CTX_copy_ex( &md_ctx,hash); |
| 746 | EVP_DigestUpdate(&md_ctx,mac_sec,md_size); |
| 747 | EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad); |
| 748 | EVP_DigestUpdate(&md_ctx,md,md_size); |
| 749 | EVP_DigestFinal_ex( &md_ctx,md,&md_size); |
| 750 | |
| 751 | EVP_MD_CTX_cleanup(&md_ctx); |
| 752 | |
| 753 | ssl3_record_sequence_update(seq); |
| 754 | return(md_size); |
| 755 | } |
| 756 | |
| 757 | void ssl3_record_sequence_update(unsigned char *seq) |
| 758 | { |
| 759 | int i; |
| 760 | |
| 761 | for (i=7; i>=0; i--) |
| 762 | { |
| 763 | ++seq[i]; |
| 764 | if (seq[i] != 0) break; |
| 765 | } |
| 766 | } |
| 767 | |
| 768 | int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, |
| 769 | int len) |
| 770 | { |
| 771 | static const unsigned char *salt[3]={ |
| 772 | #ifndef CHARSET_EBCDIC |
| 773 | (const unsigned char *)"A", |
| 774 | (const unsigned char *)"BB", |
| 775 | (const unsigned char *)"CCC", |
| 776 | #else |
| 777 | (const unsigned char *)"\x41", |
| 778 | (const unsigned char *)"\x42\x42", |
| 779 | (const unsigned char *)"\x43\x43\x43", |
| 780 | #endif |
| 781 | }; |
| 782 | unsigned char buf[EVP_MAX_MD_SIZE]; |
| 783 | EVP_MD_CTX ctx; |
| 784 | int i,ret=0; |
| 785 | unsigned int n; |
| 786 | |
| 787 | EVP_MD_CTX_init(&ctx); |
| 788 | for (i=0; i<3; i++) |
| 789 | { |
| 790 | EVP_DigestInit_ex(&ctx,s->ctx->sha1, NULL); |
| 791 | EVP_DigestUpdate(&ctx,salt[i],strlen((const char *)salt[i])); |
| 792 | EVP_DigestUpdate(&ctx,p,len); |
| 793 | EVP_DigestUpdate(&ctx,&(s->s3->client_random[0]), |
| 794 | SSL3_RANDOM_SIZE); |
| 795 | EVP_DigestUpdate(&ctx,&(s->s3->server_random[0]), |
| 796 | SSL3_RANDOM_SIZE); |
| 797 | EVP_DigestFinal_ex(&ctx,buf,&n); |
| 798 | |
| 799 | EVP_DigestInit_ex(&ctx,s->ctx->md5, NULL); |
| 800 | EVP_DigestUpdate(&ctx,p,len); |
| 801 | EVP_DigestUpdate(&ctx,buf,n); |
| 802 | EVP_DigestFinal_ex(&ctx,out,&n); |
| 803 | out+=n; |
| 804 | ret+=n; |
| 805 | } |
| 806 | EVP_MD_CTX_cleanup(&ctx); |
| 807 | return(ret); |
| 808 | } |
| 809 | |
| 810 | int ssl3_alert_code(int code) |
| 811 | { |
| 812 | switch (code) |
| 813 | { |
| 814 | case SSL_AD_CLOSE_NOTIFY: return(SSL3_AD_CLOSE_NOTIFY); |
| 815 | case SSL_AD_UNEXPECTED_MESSAGE: return(SSL3_AD_UNEXPECTED_MESSAGE); |
| 816 | case SSL_AD_BAD_RECORD_MAC: return(SSL3_AD_BAD_RECORD_MAC); |
| 817 | case SSL_AD_DECRYPTION_FAILED: return(SSL3_AD_BAD_RECORD_MAC); |
| 818 | case SSL_AD_RECORD_OVERFLOW: return(SSL3_AD_BAD_RECORD_MAC); |
| 819 | case SSL_AD_DECOMPRESSION_FAILURE:return(SSL3_AD_DECOMPRESSION_FAILURE); |
| 820 | case SSL_AD_HANDSHAKE_FAILURE: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 821 | case SSL_AD_NO_CERTIFICATE: return(SSL3_AD_NO_CERTIFICATE); |
| 822 | case SSL_AD_BAD_CERTIFICATE: return(SSL3_AD_BAD_CERTIFICATE); |
| 823 | case SSL_AD_UNSUPPORTED_CERTIFICATE:return(SSL3_AD_UNSUPPORTED_CERTIFICATE); |
| 824 | case SSL_AD_CERTIFICATE_REVOKED:return(SSL3_AD_CERTIFICATE_REVOKED); |
| 825 | case SSL_AD_CERTIFICATE_EXPIRED:return(SSL3_AD_CERTIFICATE_EXPIRED); |
| 826 | case SSL_AD_CERTIFICATE_UNKNOWN:return(SSL3_AD_CERTIFICATE_UNKNOWN); |
| 827 | case SSL_AD_ILLEGAL_PARAMETER: return(SSL3_AD_ILLEGAL_PARAMETER); |
| 828 | case SSL_AD_UNKNOWN_CA: return(SSL3_AD_BAD_CERTIFICATE); |
| 829 | case SSL_AD_ACCESS_DENIED: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 830 | case SSL_AD_DECODE_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 831 | case SSL_AD_DECRYPT_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 832 | case SSL_AD_EXPORT_RESTRICTION: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 833 | case SSL_AD_PROTOCOL_VERSION: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 834 | case SSL_AD_INSUFFICIENT_SECURITY:return(SSL3_AD_HANDSHAKE_FAILURE); |
| 835 | case SSL_AD_INTERNAL_ERROR: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 836 | case SSL_AD_USER_CANCELLED: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 837 | case SSL_AD_NO_RENEGOTIATION: return(-1); /* Don't send it :-) */ |
| 838 | case SSL_AD_UNSUPPORTED_EXTENSION: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 839 | case SSL_AD_CERTIFICATE_UNOBTAINABLE: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 840 | case SSL_AD_UNRECOGNIZED_NAME: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 841 | case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 842 | case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: return(SSL3_AD_HANDSHAKE_FAILURE); |
| 843 | case SSL_AD_UNKNOWN_PSK_IDENTITY:return(TLS1_AD_UNKNOWN_PSK_IDENTITY); |
| 844 | default: return(-1); |
| 845 | } |
| 846 | } |
| 847 | |