ssl/t1_enc.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /* ====================================================================
  11  * Copyright 2005 Nokia. All rights reserved.
  12  *
  13  * The portions of the attached software ("Contribution") is developed by
  14  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
  15  * license.
  16  *
  17  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
  18  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
  19  * support (see RFC 4279) to OpenSSL.
  20  *
  21  * No patent licenses or other rights except those expressly stated in
  22  * the OpenSSL open source license shall be deemed granted or received
  23  * expressly, by implication, estoppel, or otherwise.
  24  *
  25  * No assurances are provided by Nokia that the Contribution does not
  26  * infringe the patent or other intellectual property rights of any third
  27  * party or that the license provides you with all the necessary rights
  28  * to make use of the Contribution.
  29  *
  30  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
  31  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
  32  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
  33  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
  34  * OTHERWISE.
  35  */
  36
  37 #include <stdio.h>
  38 #include "ssl_locl.h"
  39 #include <openssl/comp.h>
  40 #include <openssl/evp.h>
  41 #include <openssl/kdf.h>
  42 #include <openssl/rand.h>
  43
  44 /* seed1 through seed5 are concatenated */
  45 static int tls1_PRF(SSL *s,
  46                     const void *seed1, int seed1_len,
  47                     const void *seed2, int seed2_len,
  48                     const void *seed3, int seed3_len,
  49                     const void *seed4, int seed4_len,
  50                     const void *seed5, int seed5_len,
  51                     const unsigned char *sec, int slen,
  52                     unsigned char *out, int olen)
  53 {
  54     const EVP_MD *md = ssl_prf_md(s);
  55     EVP_PKEY_CTX *pctx = NULL;
  56
  57     int ret = 0;
  58     size_t outlen = olen;
  59
  60     if (md == NULL) {
  61         /* Should never happen */
  62         SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  63         return 0;
  64     }
  65     pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL);
  66     if (pctx == NULL || EVP_PKEY_derive_init(pctx) <= 0
  67         || EVP_PKEY_CTX_set_tls1_prf_md(pctx, md) <= 0
  68         || EVP_PKEY_CTX_set1_tls1_prf_secret(pctx, sec, slen) <= 0)
  69         goto err;
  70
  71     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed1, seed1_len) <= 0)
  72         goto err;
  73     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed2, seed2_len) <= 0)
  74         goto err;
  75     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed3, seed3_len) <= 0)
  76         goto err;
  77     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed4, seed4_len) <= 0)
  78         goto err;
  79     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed5, seed5_len) <= 0)
  80         goto err;
  81
  82     if (EVP_PKEY_derive(pctx, out, &outlen) <= 0)
  83         goto err;
  84     ret = 1;
  85
  86     err:
  87     EVP_PKEY_CTX_free(pctx);
  88     return ret;
  89 }
  90
  91 static int tls1_generate_key_block(SSL *s, unsigned char *km, int num)
  92 {
  93     int ret;
  94     ret = tls1_PRF(s,
  95                    TLS_MD_KEY_EXPANSION_CONST,
  96                    TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3->server_random,
  97                    SSL3_RANDOM_SIZE, s->s3->client_random, SSL3_RANDOM_SIZE,
  98                    NULL, 0, NULL, 0, s->session->master_key,
  99                    s->session->master_key_length, km, num);
 100
 101     return ret;
 102 }
 103
 104 int tls1_change_cipher_state(SSL *s, int which)
 105 {
 106     unsigned char *p, *mac_secret;
 107     unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 108     unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 109     unsigned char iv1[EVP_MAX_IV_LENGTH * 2];
 110     unsigned char iv2[EVP_MAX_IV_LENGTH * 2];
 111     unsigned char *ms, *key, *iv;
 112     EVP_CIPHER_CTX *dd;
 113     const EVP_CIPHER *c;
 114 #ifndef OPENSSL_NO_COMP
 115     const SSL_COMP *comp;
 116 #endif
 117     const EVP_MD *m;
 118     int mac_type;
 119     int *mac_secret_size;
 120     EVP_MD_CTX *mac_ctx;
 121     EVP_PKEY *mac_key;
 122     int n, i, j, k, cl;
 123     int reuse_dd = 0;
 124
 125     c = s->s3->tmp.new_sym_enc;
 126     m = s->s3->tmp.new_hash;
 127     mac_type = s->s3->tmp.new_mac_pkey_type;
 128 #ifndef OPENSSL_NO_COMP
 129     comp = s->s3->tmp.new_compression;
 130 #endif
 131
 132     if (which & SSL3_CC_READ) {
 133         if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 134             s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 135         else
 136             s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 137
 138         if (s->enc_read_ctx != NULL)
 139             reuse_dd = 1;
 140         else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL)
 141             goto err;
 142         else
 143             /*
 144              * make sure it's initialised in case we exit later with an error
 145              */
 146             EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 147         dd = s->enc_read_ctx;
 148         mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 149         if (mac_ctx == NULL)
 150             goto err;
 151 #ifndef OPENSSL_NO_COMP
 152         COMP_CTX_free(s->expand);
 153         s->expand = NULL;
 154         if (comp != NULL) {
 155             s->expand = COMP_CTX_new(comp->method);
 156             if (s->expand == NULL) {
 157                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,
 158                        SSL_R_COMPRESSION_LIBRARY_ERROR);
 159                 goto err2;
 160             }
 161         }
 162 #endif
 163         /*
 164          * this is done by dtls1_reset_seq_numbers for DTLS
 165          */
 166         if (!SSL_IS_DTLS(s))
 167             RECORD_LAYER_reset_read_sequence(&s->rlayer);
 168         mac_secret = &(s->s3->read_mac_secret[0]);
 169         mac_secret_size = &(s->s3->read_mac_secret_size);
 170     } else {
 171         if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 172             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 173         else
 174             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 175         if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s))
 176             reuse_dd = 1;
 177         else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL)
 178             goto err;
 179         dd = s->enc_write_ctx;
 180         if (SSL_IS_DTLS(s)) {
 181             mac_ctx = EVP_MD_CTX_new();
 182             if (mac_ctx == NULL)
 183                 goto err;
 184             s->write_hash = mac_ctx;
 185         } else {
 186             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 187             if (mac_ctx == NULL)
 188                 goto err;
 189         }
 190 #ifndef OPENSSL_NO_COMP
 191         COMP_CTX_free(s->compress);
 192         s->compress = NULL;
 193         if (comp != NULL) {
 194             s->compress = COMP_CTX_new(comp->method);
 195             if (s->compress == NULL) {
 196                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,
 197                        SSL_R_COMPRESSION_LIBRARY_ERROR);
 198                 goto err2;
 199             }
 200         }
 201 #endif
 202         /*
 203          * this is done by dtls1_reset_seq_numbers for DTLS
 204          */
 205         if (!SSL_IS_DTLS(s))
 206             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 207         mac_secret = &(s->s3->write_mac_secret[0]);
 208         mac_secret_size = &(s->s3->write_mac_secret_size);
 209     }
 210
 211     if (reuse_dd)
 212         EVP_CIPHER_CTX_reset(dd);
 213
 214     p = s->s3->tmp.key_block;
 215     i = *mac_secret_size = s->s3->tmp.new_mac_secret_size;
 216
 217     cl = EVP_CIPHER_key_length(c);
 218     j = cl;
 219     /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 220     /* If GCM/CCM mode only part of IV comes from PRF */
 221     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 222         k = EVP_GCM_TLS_FIXED_IV_LEN;
 223     else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
 224         k = EVP_CCM_TLS_FIXED_IV_LEN;
 225     else
 226         k = EVP_CIPHER_iv_length(c);
 227     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 228         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
 229         ms = &(p[0]);
 230         n = i + i;
 231         key = &(p[n]);
 232         n += j + j;
 233         iv = &(p[n]);
 234         n += k + k;
 235     } else {
 236         n = i;
 237         ms = &(p[n]);
 238         n += i + j;
 239         key = &(p[n]);
 240         n += j + k;
 241         iv = &(p[n]);
 242         n += k;
 243     }
 244
 245     if (n > s->s3->tmp.key_block_length) {
 246         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 247         goto err2;
 248     }
 249
 250     memcpy(mac_secret, ms, i);
 251
 252     if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 253         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,
 254                                        mac_secret, *mac_secret_size);
 255         if (mac_key == NULL
 256                 || EVP_DigestSignInit(mac_ctx, NULL, m, NULL, mac_key) <= 0) {
 257             EVP_PKEY_free(mac_key);
 258             SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 259             goto err2;
 260         }
 261         EVP_PKEY_free(mac_key);
 262     }
 263 #ifdef SSL_DEBUG
 264     printf("which = %04X\nmac key=", which);
 265     {
 266         int z;
 267         for (z = 0; z < i; z++)
 268             printf("%02X%c", ms[z], ((z + 1) % 16) ? ' ' : '\n');
 269     }
 270 #endif
 271
 272     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
 273         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 274             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, k, iv)) {
 275             SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 276             goto err2;
 277         }
 278     } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
 279         int taglen;
 280         if (s->s3->tmp.new_cipher->algorithm_enc & (SSL_AES128CCM8|SSL_AES256CCM8))
 281             taglen = 8;
 282         else
 283             taglen = 16;
 284         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 285             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
 286             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
 287             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, k, iv)
 288             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 289             SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 290             goto err2;
 291         }
 292     } else {
 293         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 294             SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 295             goto err2;
 296         }
 297     }
 298     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 299     if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
 300         && !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 301                                 *mac_secret_size, mac_secret)) {
 302         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 303         goto err2;
 304     }
 305 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 306     if (s->msg_callback) {
 307         int wh = which & SSL3_CC_WRITE ? TLS1_RT_CRYPTO_WRITE : 0;
 308         if (*mac_secret_size)
 309             s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
 310                             mac_secret, *mac_secret_size,
 311                             s, s->msg_callback_arg);
 312         if (c->key_len)
 313             s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
 314                             key, c->key_len, s, s->msg_callback_arg);
 315         if (k) {
 316             if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 317                 wh |= TLS1_RT_CRYPTO_FIXED_IV;
 318             else
 319                 wh |= TLS1_RT_CRYPTO_IV;
 320             s->msg_callback(2, s->version, wh, iv, k, s, s->msg_callback_arg);
 321         }
 322     }
 323 #endif
 324
 325 #ifdef SSL_DEBUG
 326     printf("which = %04X\nkey=", which);
 327     {
 328         int z;
 329         for (z = 0; z < EVP_CIPHER_key_length(c); z++)
 330             printf("%02X%c", key[z], ((z + 1) % 16) ? ' ' : '\n');
 331     }
 332     printf("\niv=");
 333     {
 334         int z;
 335         for (z = 0; z < k; z++)
 336             printf("%02X%c", iv[z], ((z + 1) % 16) ? ' ' : '\n');
 337     }
 338     printf("\n");
 339 #endif
 340
 341     OPENSSL_cleanse(tmp1, sizeof(tmp1));
 342     OPENSSL_cleanse(tmp2, sizeof(tmp1));
 343     OPENSSL_cleanse(iv1, sizeof(iv1));
 344     OPENSSL_cleanse(iv2, sizeof(iv2));
 345     return (1);
 346  err:
 347     SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
 348  err2:
 349     OPENSSL_cleanse(tmp1, sizeof(tmp1));
 350     OPENSSL_cleanse(tmp2, sizeof(tmp1));
 351     OPENSSL_cleanse(iv1, sizeof(iv1));
 352     OPENSSL_cleanse(iv2, sizeof(iv2));
 353     return (0);
 354 }
 355
 356 int tls1_setup_key_block(SSL *s)
 357 {
 358     unsigned char *p;
 359     const EVP_CIPHER *c;
 360     const EVP_MD *hash;
 361     int num;
 362     SSL_COMP *comp;
 363     int mac_type = NID_undef, mac_secret_size = 0;
 364     int ret = 0;
 365
 366     if (s->s3->tmp.key_block_length != 0)
 367         return (1);
 368
 369     if (!ssl_cipher_get_evp
 370         (s->session, &c, &hash, &mac_type, &mac_secret_size, &comp,
 371          SSL_USE_ETM(s))) {
 372         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 373         return (0);
 374     }
 375
 376     s->s3->tmp.new_sym_enc = c;
 377     s->s3->tmp.new_hash = hash;
 378     s->s3->tmp.new_mac_pkey_type = mac_type;
 379     s->s3->tmp.new_mac_secret_size = mac_secret_size;
 380     num =
 381         EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c);
 382     num *= 2;
 383
 384     ssl3_cleanup_key_block(s);
 385
 386     if ((p = OPENSSL_malloc(num)) == NULL) {
 387         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
 388         goto err;
 389     }
 390
 391     s->s3->tmp.key_block_length = num;
 392     s->s3->tmp.key_block = p;
 393
 394 #ifdef SSL_DEBUG
 395     printf("client random\n");
 396     {
 397         int z;
 398         for (z = 0; z < SSL3_RANDOM_SIZE; z++)
 399             printf("%02X%c", s->s3->client_random[z],
 400                    ((z + 1) % 16) ? ' ' : '\n');
 401     }
 402     printf("server random\n");
 403     {
 404         int z;
 405         for (z = 0; z < SSL3_RANDOM_SIZE; z++)
 406             printf("%02X%c", s->s3->server_random[z],
 407                    ((z + 1) % 16) ? ' ' : '\n');
 408     }
 409     printf("master key\n");
 410     {
 411         int z;
 412         for (z = 0; z < s->session->master_key_length; z++)
 413             printf("%02X%c", s->session->master_key[z],
 414                    ((z + 1) % 16) ? ' ' : '\n');
 415     }
 416 #endif
 417     if (!tls1_generate_key_block(s, p, num))
 418         goto err;
 419 #ifdef SSL_DEBUG
 420     printf("\nkey block\n");
 421     {
 422         int z;
 423         for (z = 0; z < num; z++)
 424             printf("%02X%c", p[z], ((z + 1) % 16) ? ' ' : '\n');
 425     }
 426 #endif
 427
 428     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 429         && s->method->version <= TLS1_VERSION) {
 430         /*
 431          * enable vulnerability countermeasure for CBC ciphers with known-IV
 432          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 433          */
 434         s->s3->need_empty_fragments = 1;
 435
 436         if (s->session->cipher != NULL) {
 437             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 438                 s->s3->need_empty_fragments = 0;
 439
 440 #ifndef OPENSSL_NO_RC4
 441             if (s->session->cipher->algorithm_enc == SSL_RC4)
 442                 s->s3->need_empty_fragments = 0;
 443 #endif
 444         }
 445     }
 446
 447     ret = 1;
 448  err:
 449     return (ret);
 450 }
 451
 452 int tls1_final_finish_mac(SSL *s, const char *str, int slen,
 453                           unsigned char *out)
 454 {
 455     int hashlen;
 456     unsigned char hash[EVP_MAX_MD_SIZE];
 457
 458     if (!ssl3_digest_cached_records(s, 0))
 459         return 0;
 460
 461     hashlen = ssl_handshake_hash(s, hash, sizeof(hash));
 462
 463     if (hashlen == 0)
 464         return 0;
 465
 466     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 467                   s->session->master_key, s->session->master_key_length,
 468                   out, TLS1_FINISH_MAC_LENGTH))
 469         return 0;
 470     OPENSSL_cleanse(hash, hashlen);
 471     return TLS1_FINISH_MAC_LENGTH;
 472 }
 473
 474 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 475                                 int len)
 476 {
 477     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 478         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 479         int hashlen;
 480         /* Digest cached records keeping record buffer (if present):
 481          * this won't affect client auth because we're freezing the buffer
 482          * at the same point (after client key exchange and before certificate
 483          * verify)
 484          */
 485         if (!ssl3_digest_cached_records(s, 1))
 486             return -1;
 487         hashlen = ssl_handshake_hash(s, hash, sizeof(hash));
 488 #ifdef SSL_DEBUG
 489         fprintf(stderr, "Handshake hashes:\n");
 490         BIO_dump_fp(stderr, (char *)hash, hashlen);
 491 #endif
 492         tls1_PRF(s,
 493                  TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 494                  TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 495                  hash, hashlen,
 496                  NULL, 0,
 497                  NULL, 0,
 498                  NULL, 0, p, len, s->session->master_key,
 499                  SSL3_MASTER_SECRET_SIZE);
 500         OPENSSL_cleanse(hash, hashlen);
 501     } else {
 502         tls1_PRF(s,
 503                  TLS_MD_MASTER_SECRET_CONST,
 504                  TLS_MD_MASTER_SECRET_CONST_SIZE,
 505                  s->s3->client_random, SSL3_RANDOM_SIZE,
 506                  NULL, 0,
 507                  s->s3->server_random, SSL3_RANDOM_SIZE,
 508                  NULL, 0, p, len, s->session->master_key,
 509                  SSL3_MASTER_SECRET_SIZE);
 510     }
 511 #ifdef SSL_DEBUG
 512     fprintf(stderr, "Premaster Secret:\n");
 513     BIO_dump_fp(stderr, (char *)p, len);
 514     fprintf(stderr, "Client Random:\n");
 515     BIO_dump_fp(stderr, (char *)s->s3->client_random, SSL3_RANDOM_SIZE);
 516     fprintf(stderr, "Server Random:\n");
 517     BIO_dump_fp(stderr, (char *)s->s3->server_random, SSL3_RANDOM_SIZE);
 518     fprintf(stderr, "Master Secret:\n");
 519     BIO_dump_fp(stderr, (char *)s->session->master_key,
 520                 SSL3_MASTER_SECRET_SIZE);
 521 #endif
 522
 523 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 524     if (s->msg_callback) {
 525         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER,
 526                         p, len, s, s->msg_callback_arg);
 527         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM,
 528                         s->s3->client_random, SSL3_RANDOM_SIZE,
 529                         s, s->msg_callback_arg);
 530         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM,
 531                         s->s3->server_random, SSL3_RANDOM_SIZE,
 532                         s, s->msg_callback_arg);
 533         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER,
 534                         s->session->master_key,
 535                         SSL3_MASTER_SECRET_SIZE, s, s->msg_callback_arg);
 536     }
 537 #endif
 538
 539     return (SSL3_MASTER_SECRET_SIZE);
 540 }
 541
 542 int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 543                                 const char *label, size_t llen,
 544                                 const unsigned char *context,
 545                                 size_t contextlen, int use_context)
 546 {
 547     unsigned char *val = NULL;
 548     size_t vallen = 0, currentvalpos;
 549     int rv;
 550
 551     /*
 552      * construct PRF arguments we construct the PRF argument ourself rather
 553      * than passing separate values into the TLS PRF to ensure that the
 554      * concatenation of values does not create a prohibited label.
 555      */
 556     vallen = llen + SSL3_RANDOM_SIZE * 2;
 557     if (use_context) {
 558         vallen += 2 + contextlen;
 559     }
 560
 561     val = OPENSSL_malloc(vallen);
 562     if (val == NULL)
 563         goto err2;
 564     currentvalpos = 0;
 565     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 566     currentvalpos += llen;
 567     memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE);
 568     currentvalpos += SSL3_RANDOM_SIZE;
 569     memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE);
 570     currentvalpos += SSL3_RANDOM_SIZE;
 571
 572     if (use_context) {
 573         val[currentvalpos] = (contextlen >> 8) & 0xff;
 574         currentvalpos++;
 575         val[currentvalpos] = contextlen & 0xff;
 576         currentvalpos++;
 577         if ((contextlen > 0) || (context != NULL)) {
 578             memcpy(val + currentvalpos, context, contextlen);
 579         }
 580     }
 581
 582     /*
 583      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 584      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 585      * the comparisons won't have buffer overflow
 586      */
 587     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 588                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 589         goto err1;
 590     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 591                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 592         goto err1;
 593     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 594                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 595         goto err1;
 596     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 597                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 598         goto err1;
 599     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 600                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 601         goto err1;
 602
 603     rv = tls1_PRF(s,
 604                   val, vallen,
 605                   NULL, 0,
 606                   NULL, 0,
 607                   NULL, 0,
 608                   NULL, 0,
 609                   s->session->master_key, s->session->master_key_length,
 610                   out, olen);
 611
 612     goto ret;
 613  err1:
 614     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL,
 615            SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 616     rv = 0;
 617     goto ret;
 618  err2:
 619     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
 620     rv = 0;
 621  ret:
 622     OPENSSL_clear_free(val, vallen);
 623     return (rv);
 624 }
 625
 626 int tls1_alert_code(int code)
 627 {
 628     switch (code) {
 629     case SSL_AD_CLOSE_NOTIFY:
 630         return (SSL3_AD_CLOSE_NOTIFY);
 631     case SSL_AD_UNEXPECTED_MESSAGE:
 632         return (SSL3_AD_UNEXPECTED_MESSAGE);
 633     case SSL_AD_BAD_RECORD_MAC:
 634         return (SSL3_AD_BAD_RECORD_MAC);
 635     case SSL_AD_DECRYPTION_FAILED:
 636         return (TLS1_AD_DECRYPTION_FAILED);
 637     case SSL_AD_RECORD_OVERFLOW:
 638         return (TLS1_AD_RECORD_OVERFLOW);
 639     case SSL_AD_DECOMPRESSION_FAILURE:
 640         return (SSL3_AD_DECOMPRESSION_FAILURE);
 641     case SSL_AD_HANDSHAKE_FAILURE:
 642         return (SSL3_AD_HANDSHAKE_FAILURE);
 643     case SSL_AD_NO_CERTIFICATE:
 644         return (-1);
 645     case SSL_AD_BAD_CERTIFICATE:
 646         return (SSL3_AD_BAD_CERTIFICATE);
 647     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 648         return (SSL3_AD_UNSUPPORTED_CERTIFICATE);
 649     case SSL_AD_CERTIFICATE_REVOKED:
 650         return (SSL3_AD_CERTIFICATE_REVOKED);
 651     case SSL_AD_CERTIFICATE_EXPIRED:
 652         return (SSL3_AD_CERTIFICATE_EXPIRED);
 653     case SSL_AD_CERTIFICATE_UNKNOWN:
 654         return (SSL3_AD_CERTIFICATE_UNKNOWN);
 655     case SSL_AD_ILLEGAL_PARAMETER:
 656         return (SSL3_AD_ILLEGAL_PARAMETER);
 657     case SSL_AD_UNKNOWN_CA:
 658         return (TLS1_AD_UNKNOWN_CA);
 659     case SSL_AD_ACCESS_DENIED:
 660         return (TLS1_AD_ACCESS_DENIED);
 661     case SSL_AD_DECODE_ERROR:
 662         return (TLS1_AD_DECODE_ERROR);
 663     case SSL_AD_DECRYPT_ERROR:
 664         return (TLS1_AD_DECRYPT_ERROR);
 665     case SSL_AD_EXPORT_RESTRICTION:
 666         return (TLS1_AD_EXPORT_RESTRICTION);
 667     case SSL_AD_PROTOCOL_VERSION:
 668         return (TLS1_AD_PROTOCOL_VERSION);
 669     case SSL_AD_INSUFFICIENT_SECURITY:
 670         return (TLS1_AD_INSUFFICIENT_SECURITY);
 671     case SSL_AD_INTERNAL_ERROR:
 672         return (TLS1_AD_INTERNAL_ERROR);
 673     case SSL_AD_USER_CANCELLED:
 674         return (TLS1_AD_USER_CANCELLED);
 675     case SSL_AD_NO_RENEGOTIATION:
 676         return (TLS1_AD_NO_RENEGOTIATION);
 677     case SSL_AD_UNSUPPORTED_EXTENSION:
 678         return (TLS1_AD_UNSUPPORTED_EXTENSION);
 679     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 680         return (TLS1_AD_CERTIFICATE_UNOBTAINABLE);
 681     case SSL_AD_UNRECOGNIZED_NAME:
 682         return (TLS1_AD_UNRECOGNIZED_NAME);
 683     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 684         return (TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE);
 685     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 686         return (TLS1_AD_BAD_CERTIFICATE_HASH_VALUE);
 687     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 688         return (TLS1_AD_UNKNOWN_PSK_IDENTITY);
 689     case SSL_AD_INAPPROPRIATE_FALLBACK:
 690         return (TLS1_AD_INAPPROPRIATE_FALLBACK);
 691     case SSL_AD_NO_APPLICATION_PROTOCOL:
 692         return (TLS1_AD_NO_APPLICATION_PROTOCOL);
 693     default:
 694         return (-1);
 695     }
 696 }