ssl/t1_enc.c

   1 /*
   2  * Copyright 1995-2022 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_CONNECTION *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, ERR_R_INTERNAL_ERROR);
  44         else
  45             ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
  46         return 0;
  47     }
  48     kdf = EVP_KDF_fetch(SSL_CONNECTION_GET_CTX(s)->libctx,
  49                         OSSL_KDF_NAME_TLS1_PRF,
  50                         SSL_CONNECTION_GET_CTX(s)->propq);
  51     if (kdf == NULL)
  52         goto err;
  53     kctx = EVP_KDF_CTX_new(kdf);
  54     EVP_KDF_free(kdf);
  55     if (kctx == NULL)
  56         goto err;
  57     mdname = EVP_MD_get0_name(md);
  58     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
  59                                             (char *)mdname, 0);
  60     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET,
  61                                              (unsigned char *)sec,
  62                                              (size_t)slen);
  63     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  64                                              (void *)seed1, (size_t)seed1_len);
  65     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  66                                              (void *)seed2, (size_t)seed2_len);
  67     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  68                                              (void *)seed3, (size_t)seed3_len);
  69     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  70                                              (void *)seed4, (size_t)seed4_len);
  71     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  72                                              (void *)seed5, (size_t)seed5_len);
  73     *p = OSSL_PARAM_construct_end();
  74     if (EVP_KDF_derive(kctx, out, olen, params)) {
  75         EVP_KDF_CTX_free(kctx);
  76         return 1;
  77     }
  78
  79  err:
  80     if (fatal)
  81         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
  82     else
  83         ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
  84     EVP_KDF_CTX_free(kctx);
  85     return 0;
  86 }
  87
  88 static int tls1_generate_key_block(SSL_CONNECTION *s, unsigned char *km,
  89                                    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 int tls_provider_set_tls_params(SSL_CONNECTION *s, EVP_CIPHER_CTX *ctx,
 105                                 const EVP_CIPHER *ciph,
 106                                 const EVP_MD *md)
 107 {
 108     /*
 109      * Provided cipher, the TLS padding/MAC removal is performed provider
 110      * side so we need to tell the ctx about our TLS version and mac size
 111      */
 112     OSSL_PARAM params[3], *pprm = params;
 113     size_t macsize = 0;
 114     int imacsize = -1;
 115
 116     if ((EVP_CIPHER_get_flags(ciph) & EVP_CIPH_FLAG_AEAD_CIPHER) == 0
 117                /*
 118                 * We look at s->ext.use_etm instead of SSL_READ_ETM() or
 119                 * SSL_WRITE_ETM() because this test applies to both reading
 120                 * and writing.
 121                 */
 122             && !s->ext.use_etm)
 123         imacsize = EVP_MD_get_size(md);
 124     if (imacsize >= 0)
 125         macsize = (size_t)imacsize;
 126
 127     *pprm++ = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_TLS_VERSION,
 128                                        &s->version);
 129     *pprm++ = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_TLS_MAC_SIZE,
 130                                           &macsize);
 131     *pprm = OSSL_PARAM_construct_end();
 132
 133     if (!EVP_CIPHER_CTX_set_params(ctx, params)) {
 134         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 135         return 0;
 136     }
 137
 138     return 1;
 139 }
 140
 141
 142 static int tls_iv_length_within_key_block(const EVP_CIPHER *c)
 143 {
 144     /* If GCM/CCM mode only part of IV comes from PRF */
 145     if (EVP_CIPHER_get_mode(c) == EVP_CIPH_GCM_MODE)
 146         return EVP_GCM_TLS_FIXED_IV_LEN;
 147     else if (EVP_CIPHER_get_mode(c) == EVP_CIPH_CCM_MODE)
 148         return EVP_CCM_TLS_FIXED_IV_LEN;
 149     else
 150         return EVP_CIPHER_get_iv_length(c);
 151 }
 152
 153 int tls1_change_cipher_state(SSL_CONNECTION *s, int which)
 154 {
 155     unsigned char *p, *mac_secret;
 156     unsigned char *key, *iv;
 157     EVP_CIPHER_CTX *dd;
 158     const EVP_CIPHER *c;
 159 #ifndef OPENSSL_NO_COMP
 160     const SSL_COMP *comp;
 161 #endif
 162     const EVP_MD *m;
 163     int mac_type;
 164     size_t mac_secret_size;
 165     EVP_MD_CTX *mac_ctx;
 166     EVP_PKEY *mac_key;
 167     size_t n, i, j, k, cl;
 168     int reuse_dd = 0;
 169 #ifndef OPENSSL_NO_KTLS
 170     ktls_crypto_info_t crypto_info;
 171     void *rl_sequence;
 172     BIO *bio;
 173 #endif
 174     SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
 175
 176     c = s->s3.tmp.new_sym_enc;
 177     m = s->s3.tmp.new_hash;
 178     mac_type = s->s3.tmp.new_mac_pkey_type;
 179 #ifndef OPENSSL_NO_COMP
 180     comp = s->s3.tmp.new_compression;
 181 #endif
 182
 183     p = s->s3.tmp.key_block;
 184     i = mac_secret_size = s->s3.tmp.new_mac_secret_size;
 185
 186     cl = EVP_CIPHER_get_key_length(c);
 187     j = cl;
 188     k = tls_iv_length_within_key_block(c);
 189     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 190         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
 191         mac_secret = &(p[0]);
 192         n = i + i;
 193         key = &(p[n]);
 194         n += j + j;
 195         iv = &(p[n]);
 196         n += k + k;
 197     } else {
 198         n = i;
 199         mac_secret = &(p[n]);
 200         n += i + j;
 201         key = &(p[n]);
 202         n += j + k;
 203         iv = &(p[n]);
 204         n += k;
 205     }
 206
 207     if (n > s->s3.tmp.key_block_length) {
 208         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 209         goto err;
 210     }
 211
 212     if (which & SSL3_CC_READ) {
 213         if (SSL_CONNECTION_IS_DTLS(s)) {
 214             if (s->ext.use_etm)
 215                 s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 216             else
 217                 s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 218
 219             if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 220                 s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 221             else
 222                 s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 223
 224             if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
 225                 s->mac_flags |= SSL_MAC_FLAG_READ_MAC_TLSTREE;
 226             else
 227                 s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_TLSTREE;
 228
 229             if (s->enc_read_ctx != NULL) {
 230                 reuse_dd = 1;
 231             } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 232                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 233                 goto err;
 234             } else {
 235                 /*
 236                 * make sure it's initialised in case we exit later with an error
 237                 */
 238                 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 239             }
 240             dd = s->enc_read_ctx;
 241             mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 242             if (mac_ctx == NULL) {
 243                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 244                 goto err;
 245             }
 246     #ifndef OPENSSL_NO_COMP
 247             COMP_CTX_free(s->expand);
 248             s->expand = NULL;
 249             if (comp != NULL) {
 250                 s->expand = COMP_CTX_new(comp->method);
 251                 if (s->expand == NULL) {
 252                     SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 253                             SSL_R_COMPRESSION_LIBRARY_ERROR);
 254                     goto err;
 255                 }
 256             }
 257     #endif
 258             /*
 259             * this is done by dtls1_reset_seq_numbers for DTLS
 260             */
 261             if (!SSL_CONNECTION_IS_DTLS(s))
 262                 RECORD_LAYER_reset_read_sequence(&s->rlayer);
 263         } else {
 264             /*
 265              * Taglen is only relevant for CCM ciphersuites. Other ciphersuites
 266              * ignore this value so we can default it to 0.
 267              */
 268             size_t taglen = 0;
 269
 270             if (EVP_CIPHER_get_mode(c) == EVP_CIPH_CCM_MODE) {
 271                 if ((s->s3.tmp. new_cipher->algorithm_enc
 272                         & (SSL_AES128CCM8 | SSL_AES256CCM8)) != 0)
 273                     taglen = EVP_CCM8_TLS_TAG_LEN;
 274                 else
 275                     taglen = EVP_CCM_TLS_TAG_LEN;
 276             }
 277
 278             if (!ssl_set_new_record_layer(s, NULL, s->version,
 279                                         OSSL_RECORD_DIRECTION_READ,
 280                                         OSSL_RECORD_PROTECTION_LEVEL_APPLICATION,
 281                                         key, cl, iv, (size_t)k, mac_secret,
 282                                         mac_secret_size, c, taglen, mac_type, m,
 283                                         comp)) {
 284                 /* SSLfatal already called */
 285                 goto err;
 286             }
 287
 288             /* TODO(RECLAYER): Temporary - remove me */
 289             goto check_ktls;
 290         }
 291     } else {
 292         s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
 293         if (s->ext.use_etm)
 294             s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 295         else
 296             s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 297
 298         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 299             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 300         else
 301             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 302
 303         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
 304             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
 305         else
 306             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
 307         if (s->enc_write_ctx != NULL && !SSL_CONNECTION_IS_DTLS(s)) {
 308             reuse_dd = 1;
 309         } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 310             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 311             goto err;
 312         }
 313         dd = s->enc_write_ctx;
 314         if (SSL_CONNECTION_IS_DTLS(s)) {
 315             mac_ctx = EVP_MD_CTX_new();
 316             if (mac_ctx == NULL) {
 317                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 318                 goto err;
 319             }
 320             s->write_hash = mac_ctx;
 321         } else {
 322             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 323             if (mac_ctx == NULL) {
 324                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 325                 goto err;
 326             }
 327         }
 328 #ifndef OPENSSL_NO_COMP
 329         COMP_CTX_free(s->compress);
 330         s->compress = NULL;
 331         if (comp != NULL) {
 332             s->compress = COMP_CTX_new(comp->method);
 333             if (s->compress == NULL) {
 334                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 335                          SSL_R_COMPRESSION_LIBRARY_ERROR);
 336                 goto err;
 337             }
 338         }
 339 #endif
 340         /*
 341          * this is done by dtls1_reset_seq_numbers for DTLS
 342          */
 343         if (!SSL_CONNECTION_IS_DTLS(s))
 344             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 345     }
 346
 347     if (reuse_dd)
 348         EVP_CIPHER_CTX_reset(dd);
 349
 350     if (!(EVP_CIPHER_get_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 351         if (mac_type == EVP_PKEY_HMAC) {
 352             mac_key = EVP_PKEY_new_raw_private_key_ex(sctx->libctx, "HMAC",
 353                                                       sctx->propq, mac_secret,
 354                                                       mac_secret_size);
 355         } else {
 356             /*
 357              * If its not HMAC then the only other types of MAC we support are
 358              * the GOST MACs, so we need to use the old style way of creating
 359              * a MAC key.
 360              */
 361             mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
 362                                            (int)mac_secret_size);
 363         }
 364         if (mac_key == NULL
 365             || EVP_DigestSignInit_ex(mac_ctx, NULL, EVP_MD_get0_name(m),
 366                                      sctx->libctx, sctx->propq, mac_key,
 367                                      NULL) <= 0) {
 368             EVP_PKEY_free(mac_key);
 369             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 370             goto err;
 371         }
 372         EVP_PKEY_free(mac_key);
 373     }
 374
 375     OSSL_TRACE_BEGIN(TLS) {
 376         BIO_printf(trc_out, "which = %04X, mac key:\n", which);
 377         BIO_dump_indent(trc_out, mac_secret, i, 4);
 378     } OSSL_TRACE_END(TLS);
 379
 380     if (EVP_CIPHER_get_mode(c) == EVP_CIPH_GCM_MODE) {
 381         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 382             || EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
 383                                     iv) <= 0) {
 384             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 385             goto err;
 386         }
 387     } else if (EVP_CIPHER_get_mode(c) == EVP_CIPH_CCM_MODE) {
 388         int taglen;
 389         if (s->s3.tmp.
 390             new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
 391             taglen = EVP_CCM8_TLS_TAG_LEN;
 392         else
 393             taglen = EVP_CCM_TLS_TAG_LEN;
 394         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 395             || (EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL) <= 0)
 396             || (EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL) <= 0)
 397             || (EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv) <= 0)
 398             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 399             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 400             goto err;
 401         }
 402     } else {
 403         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 404             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 405             goto err;
 406         }
 407     }
 408     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 409     if ((EVP_CIPHER_get_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)
 410         && mac_secret_size != 0
 411         && EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 412                                (int)mac_secret_size, mac_secret) <= 0) {
 413         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 414         goto err;
 415     }
 416     if (EVP_CIPHER_get0_provider(c) != NULL
 417             && !tls_provider_set_tls_params(s, dd, c, m)) {
 418         /* SSLfatal already called */
 419         goto err;
 420     }
 421
 422  check_ktls:
 423 #ifndef OPENSSL_NO_KTLS
 424     if (s->compress || (s->options & SSL_OP_ENABLE_KTLS) == 0)
 425         goto skip_ktls;
 426
 427     /* ktls supports only the maximum fragment size */
 428     if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
 429         goto skip_ktls;
 430
 431     /* check that cipher is supported */
 432     if (!ktls_check_supported_cipher(s, c, dd))
 433         goto skip_ktls;
 434
 435     if (which & SSL3_CC_WRITE)
 436         bio = s->wbio;
 437     else
 438         bio = s->rbio;
 439
 440     if (!ossl_assert(bio != NULL)) {
 441         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 442         goto err;
 443     }
 444
 445     /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
 446     if (which & SSL3_CC_WRITE) {
 447        if (BIO_flush(bio) <= 0)
 448            goto skip_ktls;
 449     }
 450
 451     /* ktls doesn't support renegotiation */
 452     if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) ||
 453         (BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) {
 454         SSLfatal(s, SSL_AD_NO_RENEGOTIATION, ERR_R_INTERNAL_ERROR);
 455         goto err;
 456     }
 457
 458     if (which & SSL3_CC_WRITE)
 459         rl_sequence = RECORD_LAYER_get_write_sequence(&s->rlayer);
 460     else
 461         rl_sequence = RECORD_LAYER_get_read_sequence(&s->rlayer);
 462
 463     if (!ktls_configure_crypto(s, c, dd, rl_sequence, &crypto_info,
 464                                which & SSL3_CC_WRITE, iv, key, mac_secret,
 465                                mac_secret_size))
 466         goto skip_ktls;
 467
 468     /* ktls works with user provided buffers directly */
 469     if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) {
 470         if (which & SSL3_CC_WRITE)
 471             ssl3_release_write_buffer(s);
 472         SSL_set_options(SSL_CONNECTION_GET_SSL(s), SSL_OP_NO_RENEGOTIATION);
 473     }
 474
 475  skip_ktls:
 476 #endif                          /* OPENSSL_NO_KTLS */
 477     s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
 478
 479     OSSL_TRACE_BEGIN(TLS) {
 480         BIO_printf(trc_out, "which = %04X, key:\n", which);
 481         BIO_dump_indent(trc_out, key, EVP_CIPHER_get_key_length(c), 4);
 482         BIO_printf(trc_out, "iv:\n");
 483         BIO_dump_indent(trc_out, iv, k, 4);
 484     } OSSL_TRACE_END(TLS);
 485
 486     return 1;
 487  err:
 488     return 0;
 489 }
 490
 491 int tls1_setup_key_block(SSL_CONNECTION *s)
 492 {
 493     unsigned char *p;
 494     const EVP_CIPHER *c;
 495     const EVP_MD *hash;
 496     SSL_COMP *comp;
 497     int mac_type = NID_undef;
 498     size_t num, mac_secret_size = 0;
 499     int ret = 0;
 500
 501     if (s->s3.tmp.key_block_length != 0)
 502         return 1;
 503
 504     if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
 505                             &mac_type, &mac_secret_size, &comp,
 506                             s->ext.use_etm)) {
 507         /* Error is already recorded */
 508         SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
 509         return 0;
 510     }
 511
 512     ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
 513     s->s3.tmp.new_sym_enc = c;
 514     ssl_evp_md_free(s->s3.tmp.new_hash);
 515     s->s3.tmp.new_hash = hash;
 516     s->s3.tmp.new_mac_pkey_type = mac_type;
 517     s->s3.tmp.new_mac_secret_size = mac_secret_size;
 518     num = mac_secret_size + EVP_CIPHER_get_key_length(c)
 519           + tls_iv_length_within_key_block(c);
 520     num *= 2;
 521
 522     ssl3_cleanup_key_block(s);
 523
 524     if ((p = OPENSSL_malloc(num)) == NULL) {
 525         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 526         goto err;
 527     }
 528
 529     s->s3.tmp.key_block_length = num;
 530     s->s3.tmp.key_block = p;
 531
 532     OSSL_TRACE_BEGIN(TLS) {
 533         BIO_printf(trc_out, "key block length: %zu\n", num);
 534         BIO_printf(trc_out, "client random\n");
 535         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 536         BIO_printf(trc_out, "server random\n");
 537         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 538         BIO_printf(trc_out, "master key\n");
 539         BIO_dump_indent(trc_out,
 540                         s->session->master_key,
 541                         s->session->master_key_length, 4);
 542     } OSSL_TRACE_END(TLS);
 543
 544     if (!tls1_generate_key_block(s, p, num)) {
 545         /* SSLfatal() already called */
 546         goto err;
 547     }
 548
 549     OSSL_TRACE_BEGIN(TLS) {
 550         BIO_printf(trc_out, "key block\n");
 551         BIO_dump_indent(trc_out, p, num, 4);
 552     } OSSL_TRACE_END(TLS);
 553
 554     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 555         && SSL_CONNECTION_GET_SSL(s)->method->version <= TLS1_VERSION) {
 556         /*
 557          * enable vulnerability countermeasure for CBC ciphers with known-IV
 558          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 559          */
 560         s->s3.need_empty_fragments = 1;
 561
 562         if (s->session->cipher != NULL) {
 563             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 564                 s->s3.need_empty_fragments = 0;
 565
 566             if (s->session->cipher->algorithm_enc == SSL_RC4)
 567                 s->s3.need_empty_fragments = 0;
 568         }
 569     }
 570
 571     ret = 1;
 572  err:
 573     return ret;
 574 }
 575
 576 size_t tls1_final_finish_mac(SSL_CONNECTION *s, const char *str,
 577                              size_t slen, unsigned char *out)
 578 {
 579     size_t hashlen;
 580     unsigned char hash[EVP_MAX_MD_SIZE];
 581     size_t finished_size = TLS1_FINISH_MAC_LENGTH;
 582
 583     if (s->s3.tmp.new_cipher->algorithm_mkey & SSL_kGOST18)
 584         finished_size = 32;
 585
 586     if (!ssl3_digest_cached_records(s, 0)) {
 587         /* SSLfatal() already called */
 588         return 0;
 589     }
 590
 591     if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 592         /* SSLfatal() already called */
 593         return 0;
 594     }
 595
 596     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 597                   s->session->master_key, s->session->master_key_length,
 598                   out, finished_size, 1)) {
 599         /* SSLfatal() already called */
 600         return 0;
 601     }
 602     OPENSSL_cleanse(hash, hashlen);
 603     return finished_size;
 604 }
 605
 606 int tls1_generate_master_secret(SSL_CONNECTION *s, unsigned char *out,
 607                                 unsigned char *p, size_t len,
 608                                 size_t *secret_size)
 609 {
 610     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 611         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 612         size_t hashlen;
 613         /*
 614          * Digest cached records keeping record buffer (if present): this won't
 615          * affect client auth because we're freezing the buffer at the same
 616          * point (after client key exchange and before certificate verify)
 617          */
 618         if (!ssl3_digest_cached_records(s, 1)
 619                 || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 620             /* SSLfatal() already called */
 621             return 0;
 622         }
 623         OSSL_TRACE_BEGIN(TLS) {
 624             BIO_printf(trc_out, "Handshake hashes:\n");
 625             BIO_dump(trc_out, (char *)hash, hashlen);
 626         } OSSL_TRACE_END(TLS);
 627         if (!tls1_PRF(s,
 628                       TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 629                       TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 630                       hash, hashlen,
 631                       NULL, 0,
 632                       NULL, 0,
 633                       NULL, 0, p, len, out,
 634                       SSL3_MASTER_SECRET_SIZE, 1)) {
 635             /* SSLfatal() already called */
 636             return 0;
 637         }
 638         OPENSSL_cleanse(hash, hashlen);
 639     } else {
 640         if (!tls1_PRF(s,
 641                       TLS_MD_MASTER_SECRET_CONST,
 642                       TLS_MD_MASTER_SECRET_CONST_SIZE,
 643                       s->s3.client_random, SSL3_RANDOM_SIZE,
 644                       NULL, 0,
 645                       s->s3.server_random, SSL3_RANDOM_SIZE,
 646                       NULL, 0, p, len, out,
 647                       SSL3_MASTER_SECRET_SIZE, 1)) {
 648            /* SSLfatal() already called */
 649             return 0;
 650         }
 651     }
 652
 653     OSSL_TRACE_BEGIN(TLS) {
 654         BIO_printf(trc_out, "Premaster Secret:\n");
 655         BIO_dump_indent(trc_out, p, len, 4);
 656         BIO_printf(trc_out, "Client Random:\n");
 657         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 658         BIO_printf(trc_out, "Server Random:\n");
 659         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 660         BIO_printf(trc_out, "Master Secret:\n");
 661         BIO_dump_indent(trc_out,
 662                         s->session->master_key,
 663                         SSL3_MASTER_SECRET_SIZE, 4);
 664     } OSSL_TRACE_END(TLS);
 665
 666     *secret_size = SSL3_MASTER_SECRET_SIZE;
 667     return 1;
 668 }
 669
 670 int tls1_export_keying_material(SSL_CONNECTION *s, unsigned char *out,
 671                                 size_t olen, const char *label, size_t llen,
 672                                 const unsigned char *context,
 673                                 size_t contextlen, int use_context)
 674 {
 675     unsigned char *val = NULL;
 676     size_t vallen = 0, currentvalpos;
 677     int rv;
 678
 679     /*
 680      * construct PRF arguments we construct the PRF argument ourself rather
 681      * than passing separate values into the TLS PRF to ensure that the
 682      * concatenation of values does not create a prohibited label.
 683      */
 684     vallen = llen + SSL3_RANDOM_SIZE * 2;
 685     if (use_context) {
 686         vallen += 2 + contextlen;
 687     }
 688
 689     val = OPENSSL_malloc(vallen);
 690     if (val == NULL)
 691         goto err2;
 692     currentvalpos = 0;
 693     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 694     currentvalpos += llen;
 695     memcpy(val + currentvalpos, s->s3.client_random, SSL3_RANDOM_SIZE);
 696     currentvalpos += SSL3_RANDOM_SIZE;
 697     memcpy(val + currentvalpos, s->s3.server_random, SSL3_RANDOM_SIZE);
 698     currentvalpos += SSL3_RANDOM_SIZE;
 699
 700     if (use_context) {
 701         val[currentvalpos] = (contextlen >> 8) & 0xff;
 702         currentvalpos++;
 703         val[currentvalpos] = contextlen & 0xff;
 704         currentvalpos++;
 705         if ((contextlen > 0) || (context != NULL)) {
 706             memcpy(val + currentvalpos, context, contextlen);
 707         }
 708     }
 709
 710     /*
 711      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 712      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 713      * the comparisons won't have buffer overflow
 714      */
 715     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 716                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 717         goto err1;
 718     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 719                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 720         goto err1;
 721     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 722                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 723         goto err1;
 724     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 725                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 726         goto err1;
 727     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 728                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 729         goto err1;
 730
 731     rv = tls1_PRF(s,
 732                   val, vallen,
 733                   NULL, 0,
 734                   NULL, 0,
 735                   NULL, 0,
 736                   NULL, 0,
 737                   s->session->master_key, s->session->master_key_length,
 738                   out, olen, 0);
 739
 740     goto ret;
 741  err1:
 742     ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 743     rv = 0;
 744     goto ret;
 745  err2:
 746     ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 747     rv = 0;
 748  ret:
 749     OPENSSL_clear_free(val, vallen);
 750     return rv;
 751 }
 752
 753 int tls1_alert_code(int code)
 754 {
 755     switch (code) {
 756     case SSL_AD_CLOSE_NOTIFY:
 757         return SSL3_AD_CLOSE_NOTIFY;
 758     case SSL_AD_UNEXPECTED_MESSAGE:
 759         return SSL3_AD_UNEXPECTED_MESSAGE;
 760     case SSL_AD_BAD_RECORD_MAC:
 761         return SSL3_AD_BAD_RECORD_MAC;
 762     case SSL_AD_DECRYPTION_FAILED:
 763         return TLS1_AD_DECRYPTION_FAILED;
 764     case SSL_AD_RECORD_OVERFLOW:
 765         return TLS1_AD_RECORD_OVERFLOW;
 766     case SSL_AD_DECOMPRESSION_FAILURE:
 767         return SSL3_AD_DECOMPRESSION_FAILURE;
 768     case SSL_AD_HANDSHAKE_FAILURE:
 769         return SSL3_AD_HANDSHAKE_FAILURE;
 770     case SSL_AD_NO_CERTIFICATE:
 771         return -1;
 772     case SSL_AD_BAD_CERTIFICATE:
 773         return SSL3_AD_BAD_CERTIFICATE;
 774     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 775         return SSL3_AD_UNSUPPORTED_CERTIFICATE;
 776     case SSL_AD_CERTIFICATE_REVOKED:
 777         return SSL3_AD_CERTIFICATE_REVOKED;
 778     case SSL_AD_CERTIFICATE_EXPIRED:
 779         return SSL3_AD_CERTIFICATE_EXPIRED;
 780     case SSL_AD_CERTIFICATE_UNKNOWN:
 781         return SSL3_AD_CERTIFICATE_UNKNOWN;
 782     case SSL_AD_ILLEGAL_PARAMETER:
 783         return SSL3_AD_ILLEGAL_PARAMETER;
 784     case SSL_AD_UNKNOWN_CA:
 785         return TLS1_AD_UNKNOWN_CA;
 786     case SSL_AD_ACCESS_DENIED:
 787         return TLS1_AD_ACCESS_DENIED;
 788     case SSL_AD_DECODE_ERROR:
 789         return TLS1_AD_DECODE_ERROR;
 790     case SSL_AD_DECRYPT_ERROR:
 791         return TLS1_AD_DECRYPT_ERROR;
 792     case SSL_AD_EXPORT_RESTRICTION:
 793         return TLS1_AD_EXPORT_RESTRICTION;
 794     case SSL_AD_PROTOCOL_VERSION:
 795         return TLS1_AD_PROTOCOL_VERSION;
 796     case SSL_AD_INSUFFICIENT_SECURITY:
 797         return TLS1_AD_INSUFFICIENT_SECURITY;
 798     case SSL_AD_INTERNAL_ERROR:
 799         return TLS1_AD_INTERNAL_ERROR;
 800     case SSL_AD_USER_CANCELLED:
 801         return TLS1_AD_USER_CANCELLED;
 802     case SSL_AD_NO_RENEGOTIATION:
 803         return TLS1_AD_NO_RENEGOTIATION;
 804     case SSL_AD_UNSUPPORTED_EXTENSION:
 805         return TLS1_AD_UNSUPPORTED_EXTENSION;
 806     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 807         return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
 808     case SSL_AD_UNRECOGNIZED_NAME:
 809         return TLS1_AD_UNRECOGNIZED_NAME;
 810     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 811         return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
 812     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 813         return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
 814     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 815         return TLS1_AD_UNKNOWN_PSK_IDENTITY;
 816     case SSL_AD_INAPPROPRIATE_FALLBACK:
 817         return TLS1_AD_INAPPROPRIATE_FALLBACK;
 818     case SSL_AD_NO_APPLICATION_PROTOCOL:
 819         return TLS1_AD_NO_APPLICATION_PROTOCOL;
 820     case SSL_AD_CERTIFICATE_REQUIRED:
 821         return SSL_AD_HANDSHAKE_FAILURE;
 822     case TLS13_AD_MISSING_EXTENSION:
 823         return SSL_AD_HANDSHAKE_FAILURE;
 824     default:
 825         return -1;
 826     }
 827 }