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, size_t seed1_len,
  47                     const void *seed2, size_t seed2_len,
  48                     const void *seed3, size_t seed3_len,
  49                     const void *seed4, size_t seed4_len,
  50                     const void *seed5, size_t seed5_len,
  51                     const unsigned char *sec, size_t slen,
  52                     unsigned char *out, size_t olen)
  53 {
  54     const EVP_MD *md = ssl_prf_md(s);
  55     EVP_PKEY_CTX *pctx = NULL;
  56
  57     int ret = 0;
  58
  59     if (md == NULL) {
  60         /* Should never happen */
  61         SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  62         return 0;
  63     }
  64     pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL);
  65     if (pctx == NULL || EVP_PKEY_derive_init(pctx) <= 0
  66         || EVP_PKEY_CTX_set_tls1_prf_md(pctx, md) <= 0
  67         || EVP_PKEY_CTX_set1_tls1_prf_secret(pctx, sec, (int)slen) <= 0)
  68         goto err;
  69
  70     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed1, (int)seed1_len) <= 0)
  71         goto err;
  72     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed2, (int)seed2_len) <= 0)
  73         goto err;
  74     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed3, (int)seed3_len) <= 0)
  75         goto err;
  76     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed4, (int)seed4_len) <= 0)
  77         goto err;
  78     if (EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed5, (int)seed5_len) <= 0)
  79         goto err;
  80
  81     if (EVP_PKEY_derive(pctx, out, &olen) <= 0)
  82         goto err;
  83     ret = 1;
  84
  85  err:
  86     EVP_PKEY_CTX_free(pctx);
  87     return ret;
  88 }
  89
  90 static int tls1_generate_key_block(SSL *s, unsigned char *km, size_t num)
  91 {
  92     int ret;
  93     ret = tls1_PRF(s,
  94                    TLS_MD_KEY_EXPANSION_CONST,
  95                    TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3->server_random,
  96                    SSL3_RANDOM_SIZE, s->s3->client_random, SSL3_RANDOM_SIZE,
  97                    NULL, 0, NULL, 0, s->session->master_key,
  98                    s->session->master_key_length, km, num);
  99
 100     return ret;
 101 }
 102
 103 int tls1_change_cipher_state(SSL *s, int which)
 104 {
 105     unsigned char *p, *mac_secret;
 106     unsigned char tmp1[EVP_MAX_KEY_LENGTH];
 107     unsigned char tmp2[EVP_MAX_KEY_LENGTH];
 108     unsigned char iv1[EVP_MAX_IV_LENGTH * 2];
 109     unsigned char iv2[EVP_MAX_IV_LENGTH * 2];
 110     unsigned char *ms, *key, *iv;
 111     EVP_CIPHER_CTX *dd;
 112     const EVP_CIPHER *c;
 113 #ifndef OPENSSL_NO_COMP
 114     const SSL_COMP *comp;
 115 #endif
 116     const EVP_MD *m;
 117     int mac_type;
 118     size_t *mac_secret_size;
 119     EVP_MD_CTX *mac_ctx;
 120     EVP_PKEY *mac_key;
 121     size_t n, i, j, k, cl;
 122     int reuse_dd = 0;
 123
 124     c = s->s3->tmp.new_sym_enc;
 125     m = s->s3->tmp.new_hash;
 126     mac_type = s->s3->tmp.new_mac_pkey_type;
 127 #ifndef OPENSSL_NO_COMP
 128     comp = s->s3->tmp.new_compression;
 129 #endif
 130
 131     if (which & SSL3_CC_READ) {
 132         if (s->ext.use_etm)
 133             s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 134         else
 135             s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 136
 137         if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 138             s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 139         else
 140             s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 141
 142         if (s->enc_read_ctx != NULL)
 143             reuse_dd = 1;
 144         else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL)
 145             goto err;
 146         else
 147             /*
 148              * make sure it's initialised in case we exit later with an error
 149              */
 150             EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 151         dd = s->enc_read_ctx;
 152         mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 153         if (mac_ctx == NULL)
 154             goto err;
 155 #ifndef OPENSSL_NO_COMP
 156         COMP_CTX_free(s->expand);
 157         s->expand = NULL;
 158         if (comp != NULL) {
 159             s->expand = COMP_CTX_new(comp->method);
 160             if (s->expand == NULL) {
 161                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,
 162                        SSL_R_COMPRESSION_LIBRARY_ERROR);
 163                 goto err2;
 164             }
 165         }
 166 #endif
 167         /*
 168          * this is done by dtls1_reset_seq_numbers for DTLS
 169          */
 170         if (!SSL_IS_DTLS(s))
 171             RECORD_LAYER_reset_read_sequence(&s->rlayer);
 172         mac_secret = &(s->s3->read_mac_secret[0]);
 173         mac_secret_size = &(s->s3->read_mac_secret_size);
 174     } else {
 175         if (s->ext.use_etm)
 176             s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 177         else
 178             s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 179
 180         if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 181             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 182         else
 183             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 184         if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s))
 185             reuse_dd = 1;
 186         else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL)
 187             goto err;
 188         dd = s->enc_write_ctx;
 189         if (SSL_IS_DTLS(s)) {
 190             mac_ctx = EVP_MD_CTX_new();
 191             if (mac_ctx == NULL)
 192                 goto err;
 193             s->write_hash = mac_ctx;
 194         } else {
 195             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 196             if (mac_ctx == NULL)
 197                 goto err;
 198         }
 199 #ifndef OPENSSL_NO_COMP
 200         COMP_CTX_free(s->compress);
 201         s->compress = NULL;
 202         if (comp != NULL) {
 203             s->compress = COMP_CTX_new(comp->method);
 204             if (s->compress == NULL) {
 205                 SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE,
 206                        SSL_R_COMPRESSION_LIBRARY_ERROR);
 207                 goto err2;
 208             }
 209         }
 210 #endif
 211         /*
 212          * this is done by dtls1_reset_seq_numbers for DTLS
 213          */
 214         if (!SSL_IS_DTLS(s))
 215             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 216         mac_secret = &(s->s3->write_mac_secret[0]);
 217         mac_secret_size = &(s->s3->write_mac_secret_size);
 218     }
 219
 220     if (reuse_dd)
 221         EVP_CIPHER_CTX_reset(dd);
 222
 223     p = s->s3->tmp.key_block;
 224     i = *mac_secret_size = s->s3->tmp.new_mac_secret_size;
 225
 226     /* TODO(size_t): convert me */
 227     cl = EVP_CIPHER_key_length(c);
 228     j = cl;
 229     /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 230     /* If GCM/CCM mode only part of IV comes from PRF */
 231     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 232         k = EVP_GCM_TLS_FIXED_IV_LEN;
 233     else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
 234         k = EVP_CCM_TLS_FIXED_IV_LEN;
 235     else
 236         k = EVP_CIPHER_iv_length(c);
 237     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 238         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
 239         ms = &(p[0]);
 240         n = i + i;
 241         key = &(p[n]);
 242         n += j + j;
 243         iv = &(p[n]);
 244         n += k + k;
 245     } else {
 246         n = i;
 247         ms = &(p[n]);
 248         n += i + j;
 249         key = &(p[n]);
 250         n += j + k;
 251         iv = &(p[n]);
 252         n += k;
 253     }
 254
 255     if (n > s->s3->tmp.key_block_length) {
 256         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 257         goto err2;
 258     }
 259
 260     memcpy(mac_secret, ms, i);
 261
 262     if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 263         /* TODO(size_t): Convert this function */
 264         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL,
 265                                        mac_secret, (int)*mac_secret_size);
 266         if (mac_key == NULL
 267             || EVP_DigestSignInit(mac_ctx, NULL, m, NULL, mac_key) <= 0) {
 268             EVP_PKEY_free(mac_key);
 269             SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 270             goto err2;
 271         }
 272         EVP_PKEY_free(mac_key);
 273     }
 274 #ifdef SSL_DEBUG
 275     printf("which = %04X\nmac key=", which);
 276     {
 277         size_t z;
 278         for (z = 0; z < i; z++)
 279             printf("%02X%c", ms[z], ((z + 1) % 16) ? ' ' : '\n');
 280     }
 281 #endif
 282
 283     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
 284         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 285             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
 286                                     iv)) {
 287             SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 288             goto err2;
 289         }
 290     } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
 291         int taglen;
 292         if (s->s3->tmp.
 293             new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
 294             taglen = EVP_CCM8_TLS_TAG_LEN;
 295         else
 296             taglen = EVP_CCM_TLS_TAG_LEN;
 297         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 298             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
 299             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
 300             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
 301             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 302             SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 303             goto err2;
 304         }
 305     } else {
 306         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 307             SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 308             goto err2;
 309         }
 310     }
 311     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 312     if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
 313         && !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 314                                 (int)*mac_secret_size, mac_secret)) {
 315         SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
 316         goto err2;
 317     }
 318 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 319     if (s->msg_callback) {
 320         int wh = which & SSL3_CC_WRITE ? TLS1_RT_CRYPTO_WRITE : 0;
 321         if (*mac_secret_size)
 322             s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
 323                             mac_secret, *mac_secret_size,
 324                             s, s->msg_callback_arg);
 325         if (c->key_len)
 326             s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
 327                             key, c->key_len, s, s->msg_callback_arg);
 328         if (k) {
 329             if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 330                 wh |= TLS1_RT_CRYPTO_FIXED_IV;
 331             else
 332                 wh |= TLS1_RT_CRYPTO_IV;
 333             s->msg_callback(2, s->version, wh, iv, k, s, s->msg_callback_arg);
 334         }
 335     }
 336 #endif
 337
 338 #ifdef SSL_DEBUG
 339     printf("which = %04X\nkey=", which);
 340     {
 341         int z;
 342         for (z = 0; z < EVP_CIPHER_key_length(c); z++)
 343             printf("%02X%c", key[z], ((z + 1) % 16) ? ' ' : '\n');
 344     }
 345     printf("\niv=");
 346     {
 347         size_t z;
 348         for (z = 0; z < k; z++)
 349             printf("%02X%c", iv[z], ((z + 1) % 16) ? ' ' : '\n');
 350     }
 351     printf("\n");
 352 #endif
 353
 354     OPENSSL_cleanse(tmp1, sizeof(tmp1));
 355     OPENSSL_cleanse(tmp2, sizeof(tmp1));
 356     OPENSSL_cleanse(iv1, sizeof(iv1));
 357     OPENSSL_cleanse(iv2, sizeof(iv2));
 358     return (1);
 359  err:
 360     SSLerr(SSL_F_TLS1_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
 361  err2:
 362     OPENSSL_cleanse(tmp1, sizeof(tmp1));
 363     OPENSSL_cleanse(tmp2, sizeof(tmp1));
 364     OPENSSL_cleanse(iv1, sizeof(iv1));
 365     OPENSSL_cleanse(iv2, sizeof(iv2));
 366     return (0);
 367 }
 368
 369 int tls1_setup_key_block(SSL *s)
 370 {
 371     unsigned char *p;
 372     const EVP_CIPHER *c;
 373     const EVP_MD *hash;
 374     SSL_COMP *comp;
 375     int mac_type = NID_undef;
 376     size_t num, mac_secret_size = 0;
 377     int ret = 0;
 378
 379     if (s->s3->tmp.key_block_length != 0)
 380         return (1);
 381
 382     if (!ssl_cipher_get_evp(s->session, &c, &hash, &mac_type, &mac_secret_size,
 383                             &comp, s->ext.use_etm)) {
 384         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 385         return (0);
 386     }
 387
 388     s->s3->tmp.new_sym_enc = c;
 389     s->s3->tmp.new_hash = hash;
 390     s->s3->tmp.new_mac_pkey_type = mac_type;
 391     s->s3->tmp.new_mac_secret_size = mac_secret_size;
 392     num = EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c);
 393     num *= 2;
 394
 395     ssl3_cleanup_key_block(s);
 396
 397     if ((p = OPENSSL_malloc(num)) == NULL) {
 398         SSLerr(SSL_F_TLS1_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE);
 399         goto err;
 400     }
 401
 402     s->s3->tmp.key_block_length = num;
 403     s->s3->tmp.key_block = p;
 404
 405 #ifdef SSL_DEBUG
 406     printf("client random\n");
 407     {
 408         int z;
 409         for (z = 0; z < SSL3_RANDOM_SIZE; z++)
 410             printf("%02X%c", s->s3->client_random[z],
 411                    ((z + 1) % 16) ? ' ' : '\n');
 412     }
 413     printf("server random\n");
 414     {
 415         int z;
 416         for (z = 0; z < SSL3_RANDOM_SIZE; z++)
 417             printf("%02X%c", s->s3->server_random[z],
 418                    ((z + 1) % 16) ? ' ' : '\n');
 419     }
 420     printf("master key\n");
 421     {
 422         size_t z;
 423         for (z = 0; z < s->session->master_key_length; z++)
 424             printf("%02X%c", s->session->master_key[z],
 425                    ((z + 1) % 16) ? ' ' : '\n');
 426     }
 427 #endif
 428     if (!tls1_generate_key_block(s, p, num))
 429         goto err;
 430 #ifdef SSL_DEBUG
 431     printf("\nkey block\n");
 432     {
 433         size_t z;
 434         for (z = 0; z < num; z++)
 435             printf("%02X%c", p[z], ((z + 1) % 16) ? ' ' : '\n');
 436     }
 437 #endif
 438
 439     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 440         && s->method->version <= TLS1_VERSION) {
 441         /*
 442          * enable vulnerability countermeasure for CBC ciphers with known-IV
 443          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 444          */
 445         s->s3->need_empty_fragments = 1;
 446
 447         if (s->session->cipher != NULL) {
 448             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 449                 s->s3->need_empty_fragments = 0;
 450
 451 #ifndef OPENSSL_NO_RC4
 452             if (s->session->cipher->algorithm_enc == SSL_RC4)
 453                 s->s3->need_empty_fragments = 0;
 454 #endif
 455         }
 456     }
 457
 458     ret = 1;
 459  err:
 460     return (ret);
 461 }
 462
 463 size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
 464                              unsigned char *out)
 465 {
 466     size_t hashlen;
 467     unsigned char hash[EVP_MAX_MD_SIZE];
 468
 469     if (!ssl3_digest_cached_records(s, 0))
 470         return 0;
 471
 472     if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen))
 473         return 0;
 474
 475     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 476                   s->session->master_key, s->session->master_key_length,
 477                   out, TLS1_FINISH_MAC_LENGTH))
 478         return 0;
 479     OPENSSL_cleanse(hash, hashlen);
 480     return TLS1_FINISH_MAC_LENGTH;
 481 }
 482
 483 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 484                                 size_t len, size_t *secret_size)
 485 {
 486     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 487         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 488         size_t hashlen;
 489         /*
 490          * Digest cached records keeping record buffer (if present): this wont
 491          * affect client auth because we're freezing the buffer at the same
 492          * point (after client key exchange and before certificate verify)
 493          */
 494         if (!ssl3_digest_cached_records(s, 1))
 495             return 0;
 496         if(!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen))
 497             return 0;
 498 #ifdef SSL_DEBUG
 499         fprintf(stderr, "Handshake hashes:\n");
 500         BIO_dump_fp(stderr, (char *)hash, hashlen);
 501 #endif
 502         tls1_PRF(s,
 503                  TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 504                  TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 505                  hash, hashlen,
 506                  NULL, 0,
 507                  NULL, 0,
 508                  NULL, 0, p, len, s->session->master_key,
 509                  SSL3_MASTER_SECRET_SIZE);
 510         OPENSSL_cleanse(hash, hashlen);
 511     } else {
 512         tls1_PRF(s,
 513                  TLS_MD_MASTER_SECRET_CONST,
 514                  TLS_MD_MASTER_SECRET_CONST_SIZE,
 515                  s->s3->client_random, SSL3_RANDOM_SIZE,
 516                  NULL, 0,
 517                  s->s3->server_random, SSL3_RANDOM_SIZE,
 518                  NULL, 0, p, len, s->session->master_key,
 519                  SSL3_MASTER_SECRET_SIZE);
 520     }
 521 #ifdef SSL_DEBUG
 522     fprintf(stderr, "Premaster Secret:\n");
 523     BIO_dump_fp(stderr, (char *)p, len);
 524     fprintf(stderr, "Client Random:\n");
 525     BIO_dump_fp(stderr, (char *)s->s3->client_random, SSL3_RANDOM_SIZE);
 526     fprintf(stderr, "Server Random:\n");
 527     BIO_dump_fp(stderr, (char *)s->s3->server_random, SSL3_RANDOM_SIZE);
 528     fprintf(stderr, "Master Secret:\n");
 529     BIO_dump_fp(stderr, (char *)s->session->master_key,
 530                 SSL3_MASTER_SECRET_SIZE);
 531 #endif
 532
 533 #ifdef OPENSSL_SSL_TRACE_CRYPTO
 534     if (s->msg_callback) {
 535         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER,
 536                         p, len, s, s->msg_callback_arg);
 537         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM,
 538                         s->s3->client_random, SSL3_RANDOM_SIZE,
 539                         s, s->msg_callback_arg);
 540         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM,
 541                         s->s3->server_random, SSL3_RANDOM_SIZE,
 542                         s, s->msg_callback_arg);
 543         s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER,
 544                         s->session->master_key,
 545                         SSL3_MASTER_SECRET_SIZE, s, s->msg_callback_arg);
 546     }
 547 #endif
 548
 549     *secret_size = SSL3_MASTER_SECRET_SIZE;
 550     return 1;
 551 }
 552
 553 int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 554                                 const char *label, size_t llen,
 555                                 const unsigned char *context,
 556                                 size_t contextlen, int use_context)
 557 {
 558     unsigned char *val = NULL;
 559     size_t vallen = 0, currentvalpos;
 560     int rv;
 561
 562     /*
 563      * construct PRF arguments we construct the PRF argument ourself rather
 564      * than passing separate values into the TLS PRF to ensure that the
 565      * concatenation of values does not create a prohibited label.
 566      */
 567     vallen = llen + SSL3_RANDOM_SIZE * 2;
 568     if (use_context) {
 569         vallen += 2 + contextlen;
 570     }
 571
 572     val = OPENSSL_malloc(vallen);
 573     if (val == NULL)
 574         goto err2;
 575     currentvalpos = 0;
 576     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 577     currentvalpos += llen;
 578     memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE);
 579     currentvalpos += SSL3_RANDOM_SIZE;
 580     memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE);
 581     currentvalpos += SSL3_RANDOM_SIZE;
 582
 583     if (use_context) {
 584         val[currentvalpos] = (contextlen >> 8) & 0xff;
 585         currentvalpos++;
 586         val[currentvalpos] = contextlen & 0xff;
 587         currentvalpos++;
 588         if ((contextlen > 0) || (context != NULL)) {
 589             memcpy(val + currentvalpos, context, contextlen);
 590         }
 591     }
 592
 593     /*
 594      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 595      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 596      * the comparisons won't have buffer overflow
 597      */
 598     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 599                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 600         goto err1;
 601     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 602                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 603         goto err1;
 604     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 605                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 606         goto err1;
 607     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 608                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 609         goto err1;
 610     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 611                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 612         goto err1;
 613
 614     rv = tls1_PRF(s,
 615                   val, vallen,
 616                   NULL, 0,
 617                   NULL, 0,
 618                   NULL, 0,
 619                   NULL, 0,
 620                   s->session->master_key, s->session->master_key_length,
 621                   out, olen);
 622
 623     goto ret;
 624  err1:
 625     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 626     rv = 0;
 627     goto ret;
 628  err2:
 629     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
 630     rv = 0;
 631  ret:
 632     OPENSSL_clear_free(val, vallen);
 633     return (rv);
 634 }
 635
 636 int tls1_alert_code(int code)
 637 {
 638     switch (code) {
 639     case SSL_AD_CLOSE_NOTIFY:
 640         return (SSL3_AD_CLOSE_NOTIFY);
 641     case SSL_AD_UNEXPECTED_MESSAGE:
 642         return (SSL3_AD_UNEXPECTED_MESSAGE);
 643     case SSL_AD_BAD_RECORD_MAC:
 644         return (SSL3_AD_BAD_RECORD_MAC);
 645     case SSL_AD_DECRYPTION_FAILED:
 646         return (TLS1_AD_DECRYPTION_FAILED);
 647     case SSL_AD_RECORD_OVERFLOW:
 648         return (TLS1_AD_RECORD_OVERFLOW);
 649     case SSL_AD_DECOMPRESSION_FAILURE:
 650         return (SSL3_AD_DECOMPRESSION_FAILURE);
 651     case SSL_AD_HANDSHAKE_FAILURE:
 652         return (SSL3_AD_HANDSHAKE_FAILURE);
 653     case SSL_AD_NO_CERTIFICATE:
 654         return (-1);
 655     case SSL_AD_BAD_CERTIFICATE:
 656         return (SSL3_AD_BAD_CERTIFICATE);
 657     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 658         return (SSL3_AD_UNSUPPORTED_CERTIFICATE);
 659     case SSL_AD_CERTIFICATE_REVOKED:
 660         return (SSL3_AD_CERTIFICATE_REVOKED);
 661     case SSL_AD_CERTIFICATE_EXPIRED:
 662         return (SSL3_AD_CERTIFICATE_EXPIRED);
 663     case SSL_AD_CERTIFICATE_UNKNOWN:
 664         return (SSL3_AD_CERTIFICATE_UNKNOWN);
 665     case SSL_AD_ILLEGAL_PARAMETER:
 666         return (SSL3_AD_ILLEGAL_PARAMETER);
 667     case SSL_AD_UNKNOWN_CA:
 668         return (TLS1_AD_UNKNOWN_CA);
 669     case SSL_AD_ACCESS_DENIED:
 670         return (TLS1_AD_ACCESS_DENIED);
 671     case SSL_AD_DECODE_ERROR:
 672         return (TLS1_AD_DECODE_ERROR);
 673     case SSL_AD_DECRYPT_ERROR:
 674         return (TLS1_AD_DECRYPT_ERROR);
 675     case SSL_AD_EXPORT_RESTRICTION:
 676         return (TLS1_AD_EXPORT_RESTRICTION);
 677     case SSL_AD_PROTOCOL_VERSION:
 678         return (TLS1_AD_PROTOCOL_VERSION);
 679     case SSL_AD_INSUFFICIENT_SECURITY:
 680         return (TLS1_AD_INSUFFICIENT_SECURITY);
 681     case SSL_AD_INTERNAL_ERROR:
 682         return (TLS1_AD_INTERNAL_ERROR);
 683     case SSL_AD_USER_CANCELLED:
 684         return (TLS1_AD_USER_CANCELLED);
 685     case SSL_AD_NO_RENEGOTIATION:
 686         return (TLS1_AD_NO_RENEGOTIATION);
 687     case SSL_AD_UNSUPPORTED_EXTENSION:
 688         return (TLS1_AD_UNSUPPORTED_EXTENSION);
 689     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 690         return (TLS1_AD_CERTIFICATE_UNOBTAINABLE);
 691     case SSL_AD_UNRECOGNIZED_NAME:
 692         return (TLS1_AD_UNRECOGNIZED_NAME);
 693     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 694         return (TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE);
 695     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 696         return (TLS1_AD_BAD_CERTIFICATE_HASH_VALUE);
 697     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 698         return (TLS1_AD_UNKNOWN_PSK_IDENTITY);
 699     case SSL_AD_INAPPROPRIATE_FALLBACK:
 700         return (TLS1_AD_INAPPROPRIATE_FALLBACK);
 701     case SSL_AD_NO_APPLICATION_PROTOCOL:
 702         return (TLS1_AD_NO_APPLICATION_PROTOCOL);
 703     default:
 704         return (-1);
 705     }
 706 }