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_locl.h"
  13 #include "record/record_locl.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/trace.h>
  22
  23 /* seed1 through seed5 are concatenated */
  24 static int tls1_PRF(SSL *s,
  25                     const void *seed1, size_t seed1_len,
  26                     const void *seed2, size_t seed2_len,
  27                     const void *seed3, size_t seed3_len,
  28                     const void *seed4, size_t seed4_len,
  29                     const void *seed5, size_t seed5_len,
  30                     const unsigned char *sec, size_t slen,
  31                     unsigned char *out, size_t olen, int fatal)
  32 {
  33     const EVP_MD *md = ssl_prf_md(s);
  34     EVP_PKEY_CTX *pctx = NULL;
  35     int ret = 0;
  36
  37     if (md == NULL) {
  38         /* Should never happen */
  39         if (fatal)
  40             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
  41                      ERR_R_INTERNAL_ERROR);
  42         else
  43             SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  44         return 0;
  45     }
  46     pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL);
  47     if (pctx == NULL || EVP_PKEY_derive_init(pctx) <= 0
  48         || EVP_PKEY_CTX_set_tls1_prf_md(pctx, md) <= 0
  49         || EVP_PKEY_CTX_set1_tls1_prf_secret(pctx, sec, (int)slen) <= 0
  50         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed1, (int)seed1_len) <= 0
  51         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed2, (int)seed2_len) <= 0
  52         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed3, (int)seed3_len) <= 0
  53         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed4, (int)seed4_len) <= 0
  54         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed5, (int)seed5_len) <= 0
  55         || EVP_PKEY_derive(pctx, out, &olen) <= 0) {
  56         if (fatal)
  57             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
  58                      ERR_R_INTERNAL_ERROR);
  59         else
  60             SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  61         goto err;
  62     }
  63
  64     ret = 1;
  65
  66  err:
  67     EVP_PKEY_CTX_free(pctx);
  68     return ret;
  69 }
  70
  71 static int tls1_generate_key_block(SSL *s, unsigned char *km, size_t num)
  72 {
  73     int ret;
  74
  75     /* Calls SSLfatal() as required */
  76     ret = tls1_PRF(s,
  77                    TLS_MD_KEY_EXPANSION_CONST,
  78                    TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3->server_random,
  79                    SSL3_RANDOM_SIZE, s->s3->client_random, SSL3_RANDOM_SIZE,
  80                    NULL, 0, NULL, 0, s->session->master_key,
  81                    s->session->master_key_length, km, num, 1);
  82
  83     return ret;
  84 }
  85
  86 #ifndef OPENSSL_NO_KTLS
  87  /*
  88   * Count the number of records that were not processed yet from record boundary.
  89   *
  90   * This function assumes that there are only fully formed records read in the
  91   * record layer. If read_ahead is enabled, then this might be false and this
  92   * function will fail.
  93   */
  94 static int count_unprocessed_records(SSL *s)
  95 {
  96     SSL3_BUFFER *rbuf = RECORD_LAYER_get_rbuf(&s->rlayer);
  97     PACKET pkt, subpkt;
  98     int count = 0;
  99
 100     if (!PACKET_buf_init(&pkt, rbuf->buf + rbuf->offset, rbuf->left))
 101         return -1;
 102
 103     while (PACKET_remaining(&pkt) > 0) {
 104         /* Skip record type and version */
 105         if (!PACKET_forward(&pkt, 3))
 106             return -1;
 107
 108         /* Read until next record */
 109         if (PACKET_get_length_prefixed_2(&pkt, &subpkt))
 110             return -1;
 111
 112         count += 1;
 113     }
 114
 115     return count;
 116 }
 117 #endif
 118
 119 int tls1_change_cipher_state(SSL *s, int which)
 120 {
 121     unsigned char *p, *mac_secret;
 122     unsigned char *ms, *key, *iv;
 123     EVP_CIPHER_CTX *dd;
 124     const EVP_CIPHER *c;
 125 #ifndef OPENSSL_NO_COMP
 126     const SSL_COMP *comp;
 127 #endif
 128     const EVP_MD *m;
 129     int mac_type;
 130     size_t *mac_secret_size;
 131     EVP_MD_CTX *mac_ctx;
 132     EVP_PKEY *mac_key;
 133     size_t n, i, j, k, cl;
 134     int reuse_dd = 0;
 135 #ifndef OPENSSL_NO_KTLS
 136     struct tls12_crypto_info_aes_gcm_128 crypto_info;
 137     BIO *bio;
 138     unsigned char geniv[12];
 139     int count_unprocessed;
 140     int bit;
 141 #endif
 142
 143     c = s->s3->tmp.new_sym_enc;
 144     m = s->s3->tmp.new_hash;
 145     mac_type = s->s3->tmp.new_mac_pkey_type;
 146 #ifndef OPENSSL_NO_COMP
 147     comp = s->s3->tmp.new_compression;
 148 #endif
 149
 150     if (which & SSL3_CC_READ) {
 151         if (s->ext.use_etm)
 152             s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 153         else
 154             s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 155
 156         if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 157             s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 158         else
 159             s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 160
 161         if (s->enc_read_ctx != NULL) {
 162             reuse_dd = 1;
 163         } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 164             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 165                      ERR_R_MALLOC_FAILURE);
 166             goto err;
 167         } else {
 168             /*
 169              * make sure it's initialised in case we exit later with an error
 170              */
 171             EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 172         }
 173         dd = s->enc_read_ctx;
 174         mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 175         if (mac_ctx == NULL) {
 176             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 177                      ERR_R_INTERNAL_ERROR);
 178             goto err;
 179         }
 180 #ifndef OPENSSL_NO_COMP
 181         COMP_CTX_free(s->expand);
 182         s->expand = NULL;
 183         if (comp != NULL) {
 184             s->expand = COMP_CTX_new(comp->method);
 185             if (s->expand == NULL) {
 186                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 187                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 188                          SSL_R_COMPRESSION_LIBRARY_ERROR);
 189                 goto err;
 190             }
 191         }
 192 #endif
 193         /*
 194          * this is done by dtls1_reset_seq_numbers for DTLS
 195          */
 196         if (!SSL_IS_DTLS(s))
 197             RECORD_LAYER_reset_read_sequence(&s->rlayer);
 198         mac_secret = &(s->s3->read_mac_secret[0]);
 199         mac_secret_size = &(s->s3->read_mac_secret_size);
 200     } else {
 201         s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
 202         if (s->ext.use_etm)
 203             s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 204         else
 205             s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 206
 207         if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 208             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 209         else
 210             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 211         if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
 212             reuse_dd = 1;
 213         } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 214             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 215                      ERR_R_MALLOC_FAILURE);
 216             goto err;
 217         }
 218         dd = s->enc_write_ctx;
 219         if (SSL_IS_DTLS(s)) {
 220             mac_ctx = EVP_MD_CTX_new();
 221             if (mac_ctx == NULL) {
 222                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 223                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 224                          ERR_R_MALLOC_FAILURE);
 225                 goto err;
 226             }
 227             s->write_hash = mac_ctx;
 228         } else {
 229             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 230             if (mac_ctx == NULL) {
 231                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 232                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 233                          ERR_R_MALLOC_FAILURE);
 234                 goto err;
 235             }
 236         }
 237 #ifndef OPENSSL_NO_COMP
 238         COMP_CTX_free(s->compress);
 239         s->compress = NULL;
 240         if (comp != NULL) {
 241             s->compress = COMP_CTX_new(comp->method);
 242             if (s->compress == NULL) {
 243                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 244                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 245                         SSL_R_COMPRESSION_LIBRARY_ERROR);
 246                 goto err;
 247             }
 248         }
 249 #endif
 250         /*
 251          * this is done by dtls1_reset_seq_numbers for DTLS
 252          */
 253         if (!SSL_IS_DTLS(s))
 254             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 255         mac_secret = &(s->s3->write_mac_secret[0]);
 256         mac_secret_size = &(s->s3->write_mac_secret_size);
 257     }
 258
 259     if (reuse_dd)
 260         EVP_CIPHER_CTX_reset(dd);
 261
 262     p = s->s3->tmp.key_block;
 263     i = *mac_secret_size = s->s3->tmp.new_mac_secret_size;
 264
 265     /* TODO(size_t): convert me */
 266     cl = EVP_CIPHER_key_length(c);
 267     j = cl;
 268     /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 269     /* If GCM/CCM mode only part of IV comes from PRF */
 270     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 271         k = EVP_GCM_TLS_FIXED_IV_LEN;
 272     else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
 273         k = EVP_CCM_TLS_FIXED_IV_LEN;
 274     else
 275         k = EVP_CIPHER_iv_length(c);
 276     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 277         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
 278         ms = &(p[0]);
 279         n = i + i;
 280         key = &(p[n]);
 281         n += j + j;
 282         iv = &(p[n]);
 283         n += k + k;
 284     } else {
 285         n = i;
 286         ms = &(p[n]);
 287         n += i + j;
 288         key = &(p[n]);
 289         n += j + k;
 290         iv = &(p[n]);
 291         n += k;
 292     }
 293
 294     if (n > s->s3->tmp.key_block_length) {
 295         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 296                  ERR_R_INTERNAL_ERROR);
 297         goto err;
 298     }
 299
 300     memcpy(mac_secret, ms, i);
 301
 302     if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 303         /* TODO(size_t): Convert this function */
 304         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
 305                                                (int)*mac_secret_size);
 306         if (mac_key == NULL
 307             || EVP_DigestSignInit(mac_ctx, NULL, m, NULL, mac_key) <= 0) {
 308             EVP_PKEY_free(mac_key);
 309             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 310                      ERR_R_INTERNAL_ERROR);
 311             goto err;
 312         }
 313         EVP_PKEY_free(mac_key);
 314     }
 315
 316     OSSL_TRACE_BEGIN(TLS) {
 317         BIO_printf(trc_out, "which = %04X, mac key:\n", which);
 318         BIO_dump_indent(trc_out, ms, i, 4);
 319     } OSSL_TRACE_END(TLS);
 320
 321     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
 322         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 323             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
 324                                     iv)) {
 325             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 326                      ERR_R_INTERNAL_ERROR);
 327             goto err;
 328         }
 329     } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
 330         int taglen;
 331         if (s->s3->tmp.
 332             new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
 333             taglen = EVP_CCM8_TLS_TAG_LEN;
 334         else
 335             taglen = EVP_CCM_TLS_TAG_LEN;
 336         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 337             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
 338             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
 339             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
 340             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 341             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 342                      ERR_R_INTERNAL_ERROR);
 343             goto err;
 344         }
 345     } else {
 346         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 347             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 348                      ERR_R_INTERNAL_ERROR);
 349             goto err;
 350         }
 351     }
 352     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 353     if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
 354         && !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 355                                 (int)*mac_secret_size, mac_secret)) {
 356         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 357                  ERR_R_INTERNAL_ERROR);
 358         goto err;
 359     }
 360 #ifndef OPENSSL_NO_KTLS
 361     if (s->compress)
 362         goto skip_ktls;
 363
 364     if (((which & SSL3_CC_READ) && (s->mode & SSL_MODE_NO_KTLS_RX))
 365         || ((which & SSL3_CC_WRITE) && (s->mode & SSL_MODE_NO_KTLS_TX)))
 366         goto skip_ktls;
 367
 368     /* ktls supports only the maximum fragment size */
 369     if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
 370         goto skip_ktls;
 371
 372     /* check that cipher is AES_GCM_128 */
 373     if (EVP_CIPHER_nid(c) != NID_aes_128_gcm
 374         || EVP_CIPHER_mode(c) != EVP_CIPH_GCM_MODE
 375         || EVP_CIPHER_key_length(c) != TLS_CIPHER_AES_GCM_128_KEY_SIZE)
 376         goto skip_ktls;
 377
 378     /* check version is 1.2 */
 379     if (s->version != TLS1_2_VERSION)
 380         goto skip_ktls;
 381
 382     if (which & SSL3_CC_WRITE)
 383         bio = s->wbio;
 384     else
 385         bio = s->rbio;
 386
 387     if (!ossl_assert(bio != NULL)) {
 388         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 389                  ERR_R_INTERNAL_ERROR);
 390         goto err;
 391     }
 392
 393     /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
 394     if (which & SSL3_CC_WRITE) {
 395        if (BIO_flush(bio) <= 0)
 396            goto skip_ktls;
 397     }
 398
 399     /* ktls doesn't support renegotiation */
 400     if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) ||
 401         (BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) {
 402         SSLfatal(s, SSL_AD_NO_RENEGOTIATION, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 403                  ERR_R_INTERNAL_ERROR);
 404         goto err;
 405     }
 406
 407     memset(&crypto_info, 0, sizeof(crypto_info));
 408     crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_128;
 409     crypto_info.info.version = s->version;
 410
 411     EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GET_IV,
 412                         EVP_GCM_TLS_FIXED_IV_LEN + EVP_GCM_TLS_EXPLICIT_IV_LEN,
 413                         geniv);
 414     memcpy(crypto_info.iv, geniv + EVP_GCM_TLS_FIXED_IV_LEN,
 415            TLS_CIPHER_AES_GCM_128_IV_SIZE);
 416     memcpy(crypto_info.salt, geniv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
 417     memcpy(crypto_info.key, key, EVP_CIPHER_key_length(c));
 418     if (which & SSL3_CC_WRITE)
 419         memcpy(crypto_info.rec_seq, &s->rlayer.write_sequence,
 420                 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 421     else
 422         memcpy(crypto_info.rec_seq, &s->rlayer.read_sequence,
 423                 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 424
 425     if (which & SSL3_CC_READ) {
 426         count_unprocessed = count_unprocessed_records(s);
 427         if (count_unprocessed < 0)
 428             goto skip_ktls;
 429
 430         /* increment the crypto_info record sequence */
 431         while (count_unprocessed) {
 432             for (bit = 7; bit >= 0; bit--) { /* increment */
 433                 ++crypto_info.rec_seq[bit];
 434                 if (crypto_info.rec_seq[bit] != 0)
 435                     break;
 436             }
 437             count_unprocessed--;
 438         }
 439     }
 440
 441     /* ktls works with user provided buffers directly */
 442     if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) {
 443         if (which & SSL3_CC_WRITE)
 444             ssl3_release_write_buffer(s);
 445         SSL_set_options(s, SSL_OP_NO_RENEGOTIATION);
 446     }
 447
 448  skip_ktls:
 449 #endif                          /* OPENSSL_NO_KTLS */
 450     s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
 451
 452     OSSL_TRACE_BEGIN(TLS) {
 453         BIO_printf(trc_out, "which = %04X, key:\n", which);
 454         BIO_dump_indent(trc_out, key, EVP_CIPHER_key_length(c), 4);
 455         BIO_printf(trc_out, "iv:\n");
 456         BIO_dump_indent(trc_out, iv, k, 4);
 457     } OSSL_TRACE_END(TLS);
 458
 459     return 1;
 460  err:
 461     return 0;
 462 }
 463
 464 int tls1_setup_key_block(SSL *s)
 465 {
 466     unsigned char *p;
 467     const EVP_CIPHER *c;
 468     const EVP_MD *hash;
 469     SSL_COMP *comp;
 470     int mac_type = NID_undef;
 471     size_t num, mac_secret_size = 0;
 472     int ret = 0;
 473
 474     if (s->s3->tmp.key_block_length != 0)
 475         return 1;
 476
 477     if (!ssl_cipher_get_evp(s->session, &c, &hash, &mac_type, &mac_secret_size,
 478                             &comp, s->ext.use_etm)) {
 479         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 480                  SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 481         return 0;
 482     }
 483
 484     s->s3->tmp.new_sym_enc = c;
 485     s->s3->tmp.new_hash = hash;
 486     s->s3->tmp.new_mac_pkey_type = mac_type;
 487     s->s3->tmp.new_mac_secret_size = mac_secret_size;
 488     num = EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c);
 489     num *= 2;
 490
 491     ssl3_cleanup_key_block(s);
 492
 493     if ((p = OPENSSL_malloc(num)) == NULL) {
 494         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 495                  ERR_R_MALLOC_FAILURE);
 496         goto err;
 497     }
 498
 499     s->s3->tmp.key_block_length = num;
 500     s->s3->tmp.key_block = p;
 501
 502     OSSL_TRACE_BEGIN(TLS) {
 503         BIO_printf(trc_out, "client random\n");
 504         BIO_dump_indent(trc_out, s->s3->client_random, SSL3_RANDOM_SIZE, 4);
 505         BIO_printf(trc_out, "server random\n");
 506         BIO_dump_indent(trc_out, s->s3->server_random, SSL3_RANDOM_SIZE, 4);
 507         BIO_printf(trc_out, "master key\n");
 508         BIO_dump_indent(trc_out,
 509                         s->session->master_key,
 510                         s->session->master_key_length, 4);
 511     } OSSL_TRACE_END(TLS);
 512
 513     if (!tls1_generate_key_block(s, p, num)) {
 514         /* SSLfatal() already called */
 515         goto err;
 516     }
 517
 518     OSSL_TRACE_BEGIN(TLS) {
 519         BIO_printf(trc_out, "key block\n");
 520         BIO_dump_indent(trc_out, p, num, 4);
 521     } OSSL_TRACE_END(TLS);
 522
 523     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 524         && s->method->version <= TLS1_VERSION) {
 525         /*
 526          * enable vulnerability countermeasure for CBC ciphers with known-IV
 527          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 528          */
 529         s->s3->need_empty_fragments = 1;
 530
 531         if (s->session->cipher != NULL) {
 532             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 533                 s->s3->need_empty_fragments = 0;
 534
 535 #ifndef OPENSSL_NO_RC4
 536             if (s->session->cipher->algorithm_enc == SSL_RC4)
 537                 s->s3->need_empty_fragments = 0;
 538 #endif
 539         }
 540     }
 541
 542     ret = 1;
 543  err:
 544     return ret;
 545 }
 546
 547 size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
 548                              unsigned char *out)
 549 {
 550     size_t hashlen;
 551     unsigned char hash[EVP_MAX_MD_SIZE];
 552
 553     if (!ssl3_digest_cached_records(s, 0)) {
 554         /* SSLfatal() already called */
 555         return 0;
 556     }
 557
 558     if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 559         /* SSLfatal() already called */
 560         return 0;
 561     }
 562
 563     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 564                   s->session->master_key, s->session->master_key_length,
 565                   out, TLS1_FINISH_MAC_LENGTH, 1)) {
 566         /* SSLfatal() already called */
 567         return 0;
 568     }
 569     OPENSSL_cleanse(hash, hashlen);
 570     return TLS1_FINISH_MAC_LENGTH;
 571 }
 572
 573 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 574                                 size_t len, size_t *secret_size)
 575 {
 576     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 577         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 578         size_t hashlen;
 579         /*
 580          * Digest cached records keeping record buffer (if present): this wont
 581          * affect client auth because we're freezing the buffer at the same
 582          * point (after client key exchange and before certificate verify)
 583          */
 584         if (!ssl3_digest_cached_records(s, 1)
 585                 || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 586             /* SSLfatal() already called */
 587             return 0;
 588         }
 589         OSSL_TRACE_BEGIN(TLS) {
 590             BIO_printf(trc_out, "Handshake hashes:\n");
 591             BIO_dump(trc_out, (char *)hash, hashlen);
 592         } OSSL_TRACE_END(TLS);
 593         if (!tls1_PRF(s,
 594                       TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 595                       TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 596                       hash, hashlen,
 597                       NULL, 0,
 598                       NULL, 0,
 599                       NULL, 0, p, len, out,
 600                       SSL3_MASTER_SECRET_SIZE, 1)) {
 601             /* SSLfatal() already called */
 602             return 0;
 603         }
 604         OPENSSL_cleanse(hash, hashlen);
 605     } else {
 606         if (!tls1_PRF(s,
 607                       TLS_MD_MASTER_SECRET_CONST,
 608                       TLS_MD_MASTER_SECRET_CONST_SIZE,
 609                       s->s3->client_random, SSL3_RANDOM_SIZE,
 610                       NULL, 0,
 611                       s->s3->server_random, SSL3_RANDOM_SIZE,
 612                       NULL, 0, p, len, out,
 613                       SSL3_MASTER_SECRET_SIZE, 1)) {
 614            /* SSLfatal() already called */
 615             return 0;
 616         }
 617     }
 618
 619     OSSL_TRACE_BEGIN(TLS) {
 620         BIO_printf(trc_out, "Premaster Secret:\n");
 621         BIO_dump_indent(trc_out, p, len, 4);
 622         BIO_printf(trc_out, "Client Random:\n");
 623         BIO_dump_indent(trc_out, s->s3->client_random, SSL3_RANDOM_SIZE, 4);
 624         BIO_printf(trc_out, "Server Random:\n");
 625         BIO_dump_indent(trc_out, s->s3->server_random, SSL3_RANDOM_SIZE, 4);
 626         BIO_printf(trc_out, "Master Secret:\n");
 627         BIO_dump_indent(trc_out,
 628                         s->session->master_key,
 629                         SSL3_MASTER_SECRET_SIZE, 4);
 630     } OSSL_TRACE_END(TLS);
 631
 632     *secret_size = SSL3_MASTER_SECRET_SIZE;
 633     return 1;
 634 }
 635
 636 int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 637                                 const char *label, size_t llen,
 638                                 const unsigned char *context,
 639                                 size_t contextlen, int use_context)
 640 {
 641     unsigned char *val = NULL;
 642     size_t vallen = 0, currentvalpos;
 643     int rv;
 644
 645     /*
 646      * construct PRF arguments we construct the PRF argument ourself rather
 647      * than passing separate values into the TLS PRF to ensure that the
 648      * concatenation of values does not create a prohibited label.
 649      */
 650     vallen = llen + SSL3_RANDOM_SIZE * 2;
 651     if (use_context) {
 652         vallen += 2 + contextlen;
 653     }
 654
 655     val = OPENSSL_malloc(vallen);
 656     if (val == NULL)
 657         goto err2;
 658     currentvalpos = 0;
 659     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 660     currentvalpos += llen;
 661     memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE);
 662     currentvalpos += SSL3_RANDOM_SIZE;
 663     memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE);
 664     currentvalpos += SSL3_RANDOM_SIZE;
 665
 666     if (use_context) {
 667         val[currentvalpos] = (contextlen >> 8) & 0xff;
 668         currentvalpos++;
 669         val[currentvalpos] = contextlen & 0xff;
 670         currentvalpos++;
 671         if ((contextlen > 0) || (context != NULL)) {
 672             memcpy(val + currentvalpos, context, contextlen);
 673         }
 674     }
 675
 676     /*
 677      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 678      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 679      * the comparisons won't have buffer overflow
 680      */
 681     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 682                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 683         goto err1;
 684     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 685                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 686         goto err1;
 687     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 688                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 689         goto err1;
 690     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 691                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 692         goto err1;
 693     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 694                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 695         goto err1;
 696
 697     rv = tls1_PRF(s,
 698                   val, vallen,
 699                   NULL, 0,
 700                   NULL, 0,
 701                   NULL, 0,
 702                   NULL, 0,
 703                   s->session->master_key, s->session->master_key_length,
 704                   out, olen, 0);
 705
 706     goto ret;
 707  err1:
 708     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 709     rv = 0;
 710     goto ret;
 711  err2:
 712     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
 713     rv = 0;
 714  ret:
 715     OPENSSL_clear_free(val, vallen);
 716     return rv;
 717 }
 718
 719 int tls1_alert_code(int code)
 720 {
 721     switch (code) {
 722     case SSL_AD_CLOSE_NOTIFY:
 723         return SSL3_AD_CLOSE_NOTIFY;
 724     case SSL_AD_UNEXPECTED_MESSAGE:
 725         return SSL3_AD_UNEXPECTED_MESSAGE;
 726     case SSL_AD_BAD_RECORD_MAC:
 727         return SSL3_AD_BAD_RECORD_MAC;
 728     case SSL_AD_DECRYPTION_FAILED:
 729         return TLS1_AD_DECRYPTION_FAILED;
 730     case SSL_AD_RECORD_OVERFLOW:
 731         return TLS1_AD_RECORD_OVERFLOW;
 732     case SSL_AD_DECOMPRESSION_FAILURE:
 733         return SSL3_AD_DECOMPRESSION_FAILURE;
 734     case SSL_AD_HANDSHAKE_FAILURE:
 735         return SSL3_AD_HANDSHAKE_FAILURE;
 736     case SSL_AD_NO_CERTIFICATE:
 737         return -1;
 738     case SSL_AD_BAD_CERTIFICATE:
 739         return SSL3_AD_BAD_CERTIFICATE;
 740     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 741         return SSL3_AD_UNSUPPORTED_CERTIFICATE;
 742     case SSL_AD_CERTIFICATE_REVOKED:
 743         return SSL3_AD_CERTIFICATE_REVOKED;
 744     case SSL_AD_CERTIFICATE_EXPIRED:
 745         return SSL3_AD_CERTIFICATE_EXPIRED;
 746     case SSL_AD_CERTIFICATE_UNKNOWN:
 747         return SSL3_AD_CERTIFICATE_UNKNOWN;
 748     case SSL_AD_ILLEGAL_PARAMETER:
 749         return SSL3_AD_ILLEGAL_PARAMETER;
 750     case SSL_AD_UNKNOWN_CA:
 751         return TLS1_AD_UNKNOWN_CA;
 752     case SSL_AD_ACCESS_DENIED:
 753         return TLS1_AD_ACCESS_DENIED;
 754     case SSL_AD_DECODE_ERROR:
 755         return TLS1_AD_DECODE_ERROR;
 756     case SSL_AD_DECRYPT_ERROR:
 757         return TLS1_AD_DECRYPT_ERROR;
 758     case SSL_AD_EXPORT_RESTRICTION:
 759         return TLS1_AD_EXPORT_RESTRICTION;
 760     case SSL_AD_PROTOCOL_VERSION:
 761         return TLS1_AD_PROTOCOL_VERSION;
 762     case SSL_AD_INSUFFICIENT_SECURITY:
 763         return TLS1_AD_INSUFFICIENT_SECURITY;
 764     case SSL_AD_INTERNAL_ERROR:
 765         return TLS1_AD_INTERNAL_ERROR;
 766     case SSL_AD_USER_CANCELLED:
 767         return TLS1_AD_USER_CANCELLED;
 768     case SSL_AD_NO_RENEGOTIATION:
 769         return TLS1_AD_NO_RENEGOTIATION;
 770     case SSL_AD_UNSUPPORTED_EXTENSION:
 771         return TLS1_AD_UNSUPPORTED_EXTENSION;
 772     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 773         return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
 774     case SSL_AD_UNRECOGNIZED_NAME:
 775         return TLS1_AD_UNRECOGNIZED_NAME;
 776     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 777         return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
 778     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 779         return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
 780     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 781         return TLS1_AD_UNKNOWN_PSK_IDENTITY;
 782     case SSL_AD_INAPPROPRIATE_FALLBACK:
 783         return TLS1_AD_INAPPROPRIATE_FALLBACK;
 784     case SSL_AD_NO_APPLICATION_PROTOCOL:
 785         return TLS1_AD_NO_APPLICATION_PROTOCOL;
 786     case SSL_AD_CERTIFICATE_REQUIRED:
 787         return SSL_AD_HANDSHAKE_FAILURE;
 788     default:
 789         return -1;
 790     }
 791 }