ssl/t1_enc.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright 2005 Nokia. All rights reserved.
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include <stdio.h>
  12 #include "ssl_local.h"
  13 #include "record/record_local.h"
  14 #include "internal/ktls.h"
  15 #include "internal/cryptlib.h"
  16 #include <openssl/comp.h>
  17 #include <openssl/evp.h>
  18 #include <openssl/kdf.h>
  19 #include <openssl/rand.h>
  20 #include <openssl/obj_mac.h>
  21 #include <openssl/core_names.h>
  22 #include <openssl/trace.h>
  23
  24 /* seed1 through seed5 are concatenated */
  25 static int tls1_PRF(SSL *s,
  26                     const void *seed1, size_t seed1_len,
  27                     const void *seed2, size_t seed2_len,
  28                     const void *seed3, size_t seed3_len,
  29                     const void *seed4, size_t seed4_len,
  30                     const void *seed5, size_t seed5_len,
  31                     const unsigned char *sec, size_t slen,
  32                     unsigned char *out, size_t olen, int fatal)
  33 {
  34     const EVP_MD *md = ssl_prf_md(s);
  35     EVP_KDF *kdf;
  36     EVP_KDF_CTX *kctx = NULL;
  37     OSSL_PARAM params[8], *p = params;
  38     const char *mdname;
  39
  40     if (md == NULL) {
  41         /* Should never happen */
  42         if (fatal)
  43             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
  44                      ERR_R_INTERNAL_ERROR);
  45         else
  46             SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  47         return 0;
  48     }
  49     kdf = EVP_KDF_fetch(NULL, OSSL_KDF_NAME_TLS1_PRF, NULL);
  50     if (kdf == NULL)
  51         goto err;
  52     kctx = EVP_KDF_CTX_new(kdf);
  53     EVP_KDF_free(kdf);
  54     if (kctx == NULL)
  55         goto err;
  56     mdname = EVP_MD_name(md);
  57     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
  58                                             (char *)mdname, strlen(mdname) + 1);
  59     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET,
  60                                              (unsigned char *)sec,
  61                                              (size_t)slen);
  62     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  63                                              (void *)seed1, (size_t)seed1_len);
  64     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  65                                              (void *)seed2, (size_t)seed2_len);
  66     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  67                                              (void *)seed3, (size_t)seed3_len);
  68     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  69                                              (void *)seed4, (size_t)seed4_len);
  70     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  71                                              (void *)seed5, (size_t)seed5_len);
  72     *p = OSSL_PARAM_construct_end();
  73     if (EVP_KDF_CTX_set_params(kctx, params)
  74             && EVP_KDF_derive(kctx, out, olen)) {
  75         EVP_KDF_CTX_free(kctx);
  76         return 1;
  77     }
  78
  79  err:
  80     if (fatal)
  81         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
  82                  ERR_R_INTERNAL_ERROR);
  83     else
  84         SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  85     EVP_KDF_CTX_free(kctx);
  86     return 0;
  87 }
  88
  89 static int tls1_generate_key_block(SSL *s, unsigned char *km, size_t num)
  90 {
  91     int ret;
  92
  93     /* Calls SSLfatal() as required */
  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, 1);
 100
 101     return ret;
 102 }
 103
 104 #ifndef OPENSSL_NO_KTLS
 105  /*
 106   * Count the number of records that were not processed yet from record boundary.
 107   *
 108   * This function assumes that there are only fully formed records read in the
 109   * record layer. If read_ahead is enabled, then this might be false and this
 110   * function will fail.
 111   */
 112 static int count_unprocessed_records(SSL *s)
 113 {
 114     SSL3_BUFFER *rbuf = RECORD_LAYER_get_rbuf(&s->rlayer);
 115     PACKET pkt, subpkt;
 116     int count = 0;
 117
 118     if (!PACKET_buf_init(&pkt, rbuf->buf + rbuf->offset, rbuf->left))
 119         return -1;
 120
 121     while (PACKET_remaining(&pkt) > 0) {
 122         /* Skip record type and version */
 123         if (!PACKET_forward(&pkt, 3))
 124             return -1;
 125
 126         /* Read until next record */
 127         if (PACKET_get_length_prefixed_2(&pkt, &subpkt))
 128             return -1;
 129
 130         count += 1;
 131     }
 132
 133     return count;
 134 }
 135 #endif
 136
 137 int tls1_change_cipher_state(SSL *s, int which)
 138 {
 139     unsigned char *p, *mac_secret;
 140     unsigned char *ms, *key, *iv;
 141     EVP_CIPHER_CTX *dd;
 142     const EVP_CIPHER *c;
 143 #ifndef OPENSSL_NO_COMP
 144     const SSL_COMP *comp;
 145 #endif
 146     const EVP_MD *m;
 147     int mac_type;
 148     size_t *mac_secret_size;
 149     EVP_MD_CTX *mac_ctx;
 150     EVP_PKEY *mac_key;
 151     size_t n, i, j, k, cl;
 152     int reuse_dd = 0;
 153 #ifndef OPENSSL_NO_KTLS
 154     struct tls12_crypto_info_aes_gcm_128 crypto_info;
 155     BIO *bio;
 156     unsigned char geniv[12];
 157     int count_unprocessed;
 158     int bit;
 159 #endif
 160
 161     c = s->s3.tmp.new_sym_enc;
 162     m = s->s3.tmp.new_hash;
 163     mac_type = s->s3.tmp.new_mac_pkey_type;
 164 #ifndef OPENSSL_NO_COMP
 165     comp = s->s3.tmp.new_compression;
 166 #endif
 167
 168     if (which & SSL3_CC_READ) {
 169         if (s->ext.use_etm)
 170             s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 171         else
 172             s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 173
 174         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 175             s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 176         else
 177             s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 178
 179         if (s->enc_read_ctx != NULL) {
 180             reuse_dd = 1;
 181         } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 182             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 183                      ERR_R_MALLOC_FAILURE);
 184             goto err;
 185         } else {
 186             /*
 187              * make sure it's initialised in case we exit later with an error
 188              */
 189             EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 190         }
 191         dd = s->enc_read_ctx;
 192         mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 193         if (mac_ctx == NULL) {
 194             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 195                      ERR_R_INTERNAL_ERROR);
 196             goto err;
 197         }
 198 #ifndef OPENSSL_NO_COMP
 199         COMP_CTX_free(s->expand);
 200         s->expand = NULL;
 201         if (comp != NULL) {
 202             s->expand = COMP_CTX_new(comp->method);
 203             if (s->expand == NULL) {
 204                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 205                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 206                          SSL_R_COMPRESSION_LIBRARY_ERROR);
 207                 goto err;
 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_read_sequence(&s->rlayer);
 216         mac_secret = &(s->s3.read_mac_secret[0]);
 217         mac_secret_size = &(s->s3.read_mac_secret_size);
 218     } else {
 219         s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
 220         if (s->ext.use_etm)
 221             s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 222         else
 223             s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 224
 225         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 226             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 227         else
 228             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 229         if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
 230             reuse_dd = 1;
 231         } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 232             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 233                      ERR_R_MALLOC_FAILURE);
 234             goto err;
 235         }
 236         dd = s->enc_write_ctx;
 237         if (SSL_IS_DTLS(s)) {
 238             mac_ctx = EVP_MD_CTX_new();
 239             if (mac_ctx == NULL) {
 240                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 241                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 242                          ERR_R_MALLOC_FAILURE);
 243                 goto err;
 244             }
 245             s->write_hash = mac_ctx;
 246         } else {
 247             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 248             if (mac_ctx == NULL) {
 249                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 250                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 251                          ERR_R_MALLOC_FAILURE);
 252                 goto err;
 253             }
 254         }
 255 #ifndef OPENSSL_NO_COMP
 256         COMP_CTX_free(s->compress);
 257         s->compress = NULL;
 258         if (comp != NULL) {
 259             s->compress = COMP_CTX_new(comp->method);
 260             if (s->compress == NULL) {
 261                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 262                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 263                         SSL_R_COMPRESSION_LIBRARY_ERROR);
 264                 goto err;
 265             }
 266         }
 267 #endif
 268         /*
 269          * this is done by dtls1_reset_seq_numbers for DTLS
 270          */
 271         if (!SSL_IS_DTLS(s))
 272             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 273         mac_secret = &(s->s3.write_mac_secret[0]);
 274         mac_secret_size = &(s->s3.write_mac_secret_size);
 275     }
 276
 277     if (reuse_dd)
 278         EVP_CIPHER_CTX_reset(dd);
 279
 280     p = s->s3.tmp.key_block;
 281     i = *mac_secret_size = s->s3.tmp.new_mac_secret_size;
 282
 283     /* TODO(size_t): convert me */
 284     cl = EVP_CIPHER_key_length(c);
 285     j = cl;
 286     /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 287     /* If GCM/CCM mode only part of IV comes from PRF */
 288     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 289         k = EVP_GCM_TLS_FIXED_IV_LEN;
 290     else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
 291         k = EVP_CCM_TLS_FIXED_IV_LEN;
 292     else
 293         k = EVP_CIPHER_iv_length(c);
 294     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 295         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
 296         ms = &(p[0]);
 297         n = i + i;
 298         key = &(p[n]);
 299         n += j + j;
 300         iv = &(p[n]);
 301         n += k + k;
 302     } else {
 303         n = i;
 304         ms = &(p[n]);
 305         n += i + j;
 306         key = &(p[n]);
 307         n += j + k;
 308         iv = &(p[n]);
 309         n += k;
 310     }
 311
 312     if (n > s->s3.tmp.key_block_length) {
 313         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 314                  ERR_R_INTERNAL_ERROR);
 315         goto err;
 316     }
 317
 318     memcpy(mac_secret, ms, i);
 319
 320     if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 321         /* TODO(size_t): Convert this function */
 322         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
 323                                                (int)*mac_secret_size);
 324         if (mac_key == NULL
 325             || EVP_DigestSignInit(mac_ctx, NULL, m, NULL, mac_key) <= 0) {
 326             EVP_PKEY_free(mac_key);
 327             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 328                      ERR_R_INTERNAL_ERROR);
 329             goto err;
 330         }
 331         EVP_PKEY_free(mac_key);
 332     }
 333
 334     OSSL_TRACE_BEGIN(TLS) {
 335         BIO_printf(trc_out, "which = %04X, mac key:\n", which);
 336         BIO_dump_indent(trc_out, ms, i, 4);
 337     } OSSL_TRACE_END(TLS);
 338
 339     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
 340         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 341             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
 342                                     iv)) {
 343             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 344                      ERR_R_INTERNAL_ERROR);
 345             goto err;
 346         }
 347     } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
 348         int taglen;
 349         if (s->s3.tmp.
 350             new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
 351             taglen = EVP_CCM8_TLS_TAG_LEN;
 352         else
 353             taglen = EVP_CCM_TLS_TAG_LEN;
 354         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 355             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
 356             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
 357             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
 358             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 359             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 360                      ERR_R_INTERNAL_ERROR);
 361             goto err;
 362         }
 363     } else {
 364         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 365             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 366                      ERR_R_INTERNAL_ERROR);
 367             goto err;
 368         }
 369     }
 370     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 371     if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
 372         && !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 373                                 (int)*mac_secret_size, mac_secret)) {
 374         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 375                  ERR_R_INTERNAL_ERROR);
 376         goto err;
 377     }
 378 #ifndef OPENSSL_NO_KTLS
 379     if (s->compress)
 380         goto skip_ktls;
 381
 382     if (((which & SSL3_CC_READ) && (s->mode & SSL_MODE_NO_KTLS_RX))
 383         || ((which & SSL3_CC_WRITE) && (s->mode & SSL_MODE_NO_KTLS_TX)))
 384         goto skip_ktls;
 385
 386     /* ktls supports only the maximum fragment size */
 387     if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
 388         goto skip_ktls;
 389
 390     /* check that cipher is AES_GCM_128 */
 391     if (EVP_CIPHER_nid(c) != NID_aes_128_gcm
 392         || EVP_CIPHER_mode(c) != EVP_CIPH_GCM_MODE
 393         || EVP_CIPHER_key_length(c) != TLS_CIPHER_AES_GCM_128_KEY_SIZE)
 394         goto skip_ktls;
 395
 396     /* check version is 1.2 */
 397     if (s->version != TLS1_2_VERSION)
 398         goto skip_ktls;
 399
 400     if (which & SSL3_CC_WRITE)
 401         bio = s->wbio;
 402     else
 403         bio = s->rbio;
 404
 405     if (!ossl_assert(bio != NULL)) {
 406         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 407                  ERR_R_INTERNAL_ERROR);
 408         goto err;
 409     }
 410
 411     /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
 412     if (which & SSL3_CC_WRITE) {
 413        if (BIO_flush(bio) <= 0)
 414            goto skip_ktls;
 415     }
 416
 417     /* ktls doesn't support renegotiation */
 418     if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) ||
 419         (BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) {
 420         SSLfatal(s, SSL_AD_NO_RENEGOTIATION, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 421                  ERR_R_INTERNAL_ERROR);
 422         goto err;
 423     }
 424
 425     memset(&crypto_info, 0, sizeof(crypto_info));
 426     crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_128;
 427     crypto_info.info.version = s->version;
 428
 429     EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GET_IV,
 430                         EVP_GCM_TLS_FIXED_IV_LEN + EVP_GCM_TLS_EXPLICIT_IV_LEN,
 431                         geniv);
 432     memcpy(crypto_info.iv, geniv + EVP_GCM_TLS_FIXED_IV_LEN,
 433            TLS_CIPHER_AES_GCM_128_IV_SIZE);
 434     memcpy(crypto_info.salt, geniv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
 435     memcpy(crypto_info.key, key, EVP_CIPHER_key_length(c));
 436     if (which & SSL3_CC_WRITE)
 437         memcpy(crypto_info.rec_seq, &s->rlayer.write_sequence,
 438                 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 439     else
 440         memcpy(crypto_info.rec_seq, &s->rlayer.read_sequence,
 441                 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 442
 443     if (which & SSL3_CC_READ) {
 444         count_unprocessed = count_unprocessed_records(s);
 445         if (count_unprocessed < 0)
 446             goto skip_ktls;
 447
 448         /* increment the crypto_info record sequence */
 449         while (count_unprocessed) {
 450             for (bit = 7; bit >= 0; bit--) { /* increment */
 451                 ++crypto_info.rec_seq[bit];
 452                 if (crypto_info.rec_seq[bit] != 0)
 453                     break;
 454             }
 455             count_unprocessed--;
 456         }
 457     }
 458
 459     /* ktls works with user provided buffers directly */
 460     if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) {
 461         if (which & SSL3_CC_WRITE)
 462             ssl3_release_write_buffer(s);
 463         SSL_set_options(s, SSL_OP_NO_RENEGOTIATION);
 464     }
 465
 466  skip_ktls:
 467 #endif                          /* OPENSSL_NO_KTLS */
 468     s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
 469
 470     OSSL_TRACE_BEGIN(TLS) {
 471         BIO_printf(trc_out, "which = %04X, key:\n", which);
 472         BIO_dump_indent(trc_out, key, EVP_CIPHER_key_length(c), 4);
 473         BIO_printf(trc_out, "iv:\n");
 474         BIO_dump_indent(trc_out, iv, k, 4);
 475     } OSSL_TRACE_END(TLS);
 476
 477     return 1;
 478  err:
 479     return 0;
 480 }
 481
 482 int tls1_setup_key_block(SSL *s)
 483 {
 484     unsigned char *p;
 485     const EVP_CIPHER *c;
 486     const EVP_MD *hash;
 487     SSL_COMP *comp;
 488     int mac_type = NID_undef;
 489     size_t num, mac_secret_size = 0;
 490     int ret = 0;
 491
 492     if (s->s3.tmp.key_block_length != 0)
 493         return 1;
 494
 495     if (!ssl_cipher_get_evp(s->session, &c, &hash, &mac_type, &mac_secret_size,
 496                             &comp, s->ext.use_etm)) {
 497         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 498                  SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 499         return 0;
 500     }
 501
 502     s->s3.tmp.new_sym_enc = c;
 503     s->s3.tmp.new_hash = hash;
 504     s->s3.tmp.new_mac_pkey_type = mac_type;
 505     s->s3.tmp.new_mac_secret_size = mac_secret_size;
 506     num = EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c);
 507     num *= 2;
 508
 509     ssl3_cleanup_key_block(s);
 510
 511     if ((p = OPENSSL_malloc(num)) == NULL) {
 512         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 513                  ERR_R_MALLOC_FAILURE);
 514         goto err;
 515     }
 516
 517     s->s3.tmp.key_block_length = num;
 518     s->s3.tmp.key_block = p;
 519
 520     OSSL_TRACE_BEGIN(TLS) {
 521         BIO_printf(trc_out, "client random\n");
 522         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 523         BIO_printf(trc_out, "server random\n");
 524         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 525         BIO_printf(trc_out, "master key\n");
 526         BIO_dump_indent(trc_out,
 527                         s->session->master_key,
 528                         s->session->master_key_length, 4);
 529     } OSSL_TRACE_END(TLS);
 530
 531     if (!tls1_generate_key_block(s, p, num)) {
 532         /* SSLfatal() already called */
 533         goto err;
 534     }
 535
 536     OSSL_TRACE_BEGIN(TLS) {
 537         BIO_printf(trc_out, "key block\n");
 538         BIO_dump_indent(trc_out, p, num, 4);
 539     } OSSL_TRACE_END(TLS);
 540
 541     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 542         && s->method->version <= TLS1_VERSION) {
 543         /*
 544          * enable vulnerability countermeasure for CBC ciphers with known-IV
 545          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 546          */
 547         s->s3.need_empty_fragments = 1;
 548
 549         if (s->session->cipher != NULL) {
 550             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 551                 s->s3.need_empty_fragments = 0;
 552
 553 #ifndef OPENSSL_NO_RC4
 554             if (s->session->cipher->algorithm_enc == SSL_RC4)
 555                 s->s3.need_empty_fragments = 0;
 556 #endif
 557         }
 558     }
 559
 560     ret = 1;
 561  err:
 562     return ret;
 563 }
 564
 565 size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
 566                              unsigned char *out)
 567 {
 568     size_t hashlen;
 569     unsigned char hash[EVP_MAX_MD_SIZE];
 570
 571     if (!ssl3_digest_cached_records(s, 0)) {
 572         /* SSLfatal() already called */
 573         return 0;
 574     }
 575
 576     if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 577         /* SSLfatal() already called */
 578         return 0;
 579     }
 580
 581     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 582                   s->session->master_key, s->session->master_key_length,
 583                   out, TLS1_FINISH_MAC_LENGTH, 1)) {
 584         /* SSLfatal() already called */
 585         return 0;
 586     }
 587     OPENSSL_cleanse(hash, hashlen);
 588     return TLS1_FINISH_MAC_LENGTH;
 589 }
 590
 591 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 592                                 size_t len, size_t *secret_size)
 593 {
 594     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 595         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 596         size_t hashlen;
 597         /*
 598          * Digest cached records keeping record buffer (if present): this wont
 599          * affect client auth because we're freezing the buffer at the same
 600          * point (after client key exchange and before certificate verify)
 601          */
 602         if (!ssl3_digest_cached_records(s, 1)
 603                 || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 604             /* SSLfatal() already called */
 605             return 0;
 606         }
 607         OSSL_TRACE_BEGIN(TLS) {
 608             BIO_printf(trc_out, "Handshake hashes:\n");
 609             BIO_dump(trc_out, (char *)hash, hashlen);
 610         } OSSL_TRACE_END(TLS);
 611         if (!tls1_PRF(s,
 612                       TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 613                       TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 614                       hash, hashlen,
 615                       NULL, 0,
 616                       NULL, 0,
 617                       NULL, 0, p, len, out,
 618                       SSL3_MASTER_SECRET_SIZE, 1)) {
 619             /* SSLfatal() already called */
 620             return 0;
 621         }
 622         OPENSSL_cleanse(hash, hashlen);
 623     } else {
 624         if (!tls1_PRF(s,
 625                       TLS_MD_MASTER_SECRET_CONST,
 626                       TLS_MD_MASTER_SECRET_CONST_SIZE,
 627                       s->s3.client_random, SSL3_RANDOM_SIZE,
 628                       NULL, 0,
 629                       s->s3.server_random, SSL3_RANDOM_SIZE,
 630                       NULL, 0, p, len, out,
 631                       SSL3_MASTER_SECRET_SIZE, 1)) {
 632            /* SSLfatal() already called */
 633             return 0;
 634         }
 635     }
 636
 637     OSSL_TRACE_BEGIN(TLS) {
 638         BIO_printf(trc_out, "Premaster Secret:\n");
 639         BIO_dump_indent(trc_out, p, len, 4);
 640         BIO_printf(trc_out, "Client Random:\n");
 641         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 642         BIO_printf(trc_out, "Server Random:\n");
 643         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 644         BIO_printf(trc_out, "Master Secret:\n");
 645         BIO_dump_indent(trc_out,
 646                         s->session->master_key,
 647                         SSL3_MASTER_SECRET_SIZE, 4);
 648     } OSSL_TRACE_END(TLS);
 649
 650     *secret_size = SSL3_MASTER_SECRET_SIZE;
 651     return 1;
 652 }
 653
 654 int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 655                                 const char *label, size_t llen,
 656                                 const unsigned char *context,
 657                                 size_t contextlen, int use_context)
 658 {
 659     unsigned char *val = NULL;
 660     size_t vallen = 0, currentvalpos;
 661     int rv;
 662
 663     /*
 664      * construct PRF arguments we construct the PRF argument ourself rather
 665      * than passing separate values into the TLS PRF to ensure that the
 666      * concatenation of values does not create a prohibited label.
 667      */
 668     vallen = llen + SSL3_RANDOM_SIZE * 2;
 669     if (use_context) {
 670         vallen += 2 + contextlen;
 671     }
 672
 673     val = OPENSSL_malloc(vallen);
 674     if (val == NULL)
 675         goto err2;
 676     currentvalpos = 0;
 677     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 678     currentvalpos += llen;
 679     memcpy(val + currentvalpos, s->s3.client_random, SSL3_RANDOM_SIZE);
 680     currentvalpos += SSL3_RANDOM_SIZE;
 681     memcpy(val + currentvalpos, s->s3.server_random, SSL3_RANDOM_SIZE);
 682     currentvalpos += SSL3_RANDOM_SIZE;
 683
 684     if (use_context) {
 685         val[currentvalpos] = (contextlen >> 8) & 0xff;
 686         currentvalpos++;
 687         val[currentvalpos] = contextlen & 0xff;
 688         currentvalpos++;
 689         if ((contextlen > 0) || (context != NULL)) {
 690             memcpy(val + currentvalpos, context, contextlen);
 691         }
 692     }
 693
 694     /*
 695      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 696      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 697      * the comparisons won't have buffer overflow
 698      */
 699     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 700                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 701         goto err1;
 702     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 703                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 704         goto err1;
 705     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 706                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 707         goto err1;
 708     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 709                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 710         goto err1;
 711     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 712                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 713         goto err1;
 714
 715     rv = tls1_PRF(s,
 716                   val, vallen,
 717                   NULL, 0,
 718                   NULL, 0,
 719                   NULL, 0,
 720                   NULL, 0,
 721                   s->session->master_key, s->session->master_key_length,
 722                   out, olen, 0);
 723
 724     goto ret;
 725  err1:
 726     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 727     rv = 0;
 728     goto ret;
 729  err2:
 730     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
 731     rv = 0;
 732  ret:
 733     OPENSSL_clear_free(val, vallen);
 734     return rv;
 735 }
 736
 737 int tls1_alert_code(int code)
 738 {
 739     switch (code) {
 740     case SSL_AD_CLOSE_NOTIFY:
 741         return SSL3_AD_CLOSE_NOTIFY;
 742     case SSL_AD_UNEXPECTED_MESSAGE:
 743         return SSL3_AD_UNEXPECTED_MESSAGE;
 744     case SSL_AD_BAD_RECORD_MAC:
 745         return SSL3_AD_BAD_RECORD_MAC;
 746     case SSL_AD_DECRYPTION_FAILED:
 747         return TLS1_AD_DECRYPTION_FAILED;
 748     case SSL_AD_RECORD_OVERFLOW:
 749         return TLS1_AD_RECORD_OVERFLOW;
 750     case SSL_AD_DECOMPRESSION_FAILURE:
 751         return SSL3_AD_DECOMPRESSION_FAILURE;
 752     case SSL_AD_HANDSHAKE_FAILURE:
 753         return SSL3_AD_HANDSHAKE_FAILURE;
 754     case SSL_AD_NO_CERTIFICATE:
 755         return -1;
 756     case SSL_AD_BAD_CERTIFICATE:
 757         return SSL3_AD_BAD_CERTIFICATE;
 758     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 759         return SSL3_AD_UNSUPPORTED_CERTIFICATE;
 760     case SSL_AD_CERTIFICATE_REVOKED:
 761         return SSL3_AD_CERTIFICATE_REVOKED;
 762     case SSL_AD_CERTIFICATE_EXPIRED:
 763         return SSL3_AD_CERTIFICATE_EXPIRED;
 764     case SSL_AD_CERTIFICATE_UNKNOWN:
 765         return SSL3_AD_CERTIFICATE_UNKNOWN;
 766     case SSL_AD_ILLEGAL_PARAMETER:
 767         return SSL3_AD_ILLEGAL_PARAMETER;
 768     case SSL_AD_UNKNOWN_CA:
 769         return TLS1_AD_UNKNOWN_CA;
 770     case SSL_AD_ACCESS_DENIED:
 771         return TLS1_AD_ACCESS_DENIED;
 772     case SSL_AD_DECODE_ERROR:
 773         return TLS1_AD_DECODE_ERROR;
 774     case SSL_AD_DECRYPT_ERROR:
 775         return TLS1_AD_DECRYPT_ERROR;
 776     case SSL_AD_EXPORT_RESTRICTION:
 777         return TLS1_AD_EXPORT_RESTRICTION;
 778     case SSL_AD_PROTOCOL_VERSION:
 779         return TLS1_AD_PROTOCOL_VERSION;
 780     case SSL_AD_INSUFFICIENT_SECURITY:
 781         return TLS1_AD_INSUFFICIENT_SECURITY;
 782     case SSL_AD_INTERNAL_ERROR:
 783         return TLS1_AD_INTERNAL_ERROR;
 784     case SSL_AD_USER_CANCELLED:
 785         return TLS1_AD_USER_CANCELLED;
 786     case SSL_AD_NO_RENEGOTIATION:
 787         return TLS1_AD_NO_RENEGOTIATION;
 788     case SSL_AD_UNSUPPORTED_EXTENSION:
 789         return TLS1_AD_UNSUPPORTED_EXTENSION;
 790     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 791         return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
 792     case SSL_AD_UNRECOGNIZED_NAME:
 793         return TLS1_AD_UNRECOGNIZED_NAME;
 794     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 795         return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
 796     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 797         return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
 798     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 799         return TLS1_AD_UNKNOWN_PSK_IDENTITY;
 800     case SSL_AD_INAPPROPRIATE_FALLBACK:
 801         return TLS1_AD_INAPPROPRIATE_FALLBACK;
 802     case SSL_AD_NO_APPLICATION_PROTOCOL:
 803         return TLS1_AD_NO_APPLICATION_PROTOCOL;
 804     case SSL_AD_CERTIFICATE_REQUIRED:
 805         return SSL_AD_HANDSHAKE_FAILURE;
 806     default:
 807         return -1;
 808     }
 809 }