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