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_CONNECTION_IS_DTLS(s)) {
 246             if (s->enc_read_ctx != NULL) {
 247                 reuse_dd = 1;
 248             } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 249                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 250                 goto err;
 251             } else {
 252                 /*
 253                 * make sure it's initialised in case we exit later with an error
 254                 */
 255                 EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 256             }
 257             dd = s->enc_read_ctx;
 258             mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 259             if (mac_ctx == NULL) {
 260                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 261                 goto err;
 262             }
 263     #ifndef OPENSSL_NO_COMP
 264             COMP_CTX_free(s->expand);
 265             s->expand = NULL;
 266             if (comp != NULL) {
 267                 s->expand = COMP_CTX_new(comp->method);
 268                 if (s->expand == NULL) {
 269                     SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 270                             SSL_R_COMPRESSION_LIBRARY_ERROR);
 271                     goto err;
 272                 }
 273             }
 274     #endif
 275             /*
 276             * this is done by dtls1_reset_seq_numbers for DTLS
 277             */
 278             if (!SSL_CONNECTION_IS_DTLS(s))
 279                 RECORD_LAYER_reset_read_sequence(&s->rlayer);
 280         } else {
 281             if (!ssl_set_new_record_layer(s, s->version,
 282                                           OSSL_RECORD_DIRECTION_READ,
 283                                           OSSL_RECORD_PROTECTION_LEVEL_APPLICATION,
 284                                           key, cl, iv, (size_t)k, mac_secret,
 285                                           mac_secret_size, c, taglen, mac_type,
 286                                           m, comp)) {
 287                 /* SSLfatal already called */
 288                 goto err;
 289             }
 290
 291             /* TODO(RECLAYER): Temporary - remove me */
 292             goto skip_ktls;
 293         }
 294     } else {
 295         s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
 296         if (s->ext.use_etm)
 297             s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 298         else
 299             s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 300
 301         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 302             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 303         else
 304             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 305
 306         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
 307             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
 308         else
 309             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
 310         if (s->enc_write_ctx != NULL && !SSL_CONNECTION_IS_DTLS(s)) {
 311             reuse_dd = 1;
 312         } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 313             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 314             goto err;
 315         }
 316         dd = s->enc_write_ctx;
 317         if (SSL_CONNECTION_IS_DTLS(s)) {
 318             mac_ctx = EVP_MD_CTX_new();
 319             if (mac_ctx == NULL) {
 320                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 321                 goto err;
 322             }
 323             s->write_hash = mac_ctx;
 324         } else {
 325             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 326             if (mac_ctx == NULL) {
 327                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 328                 goto err;
 329             }
 330         }
 331 #ifndef OPENSSL_NO_COMP
 332         COMP_CTX_free(s->compress);
 333         s->compress = NULL;
 334         if (comp != NULL) {
 335             s->compress = COMP_CTX_new(comp->method);
 336             if (s->compress == NULL) {
 337                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 338                          SSL_R_COMPRESSION_LIBRARY_ERROR);
 339                 goto err;
 340             }
 341         }
 342 #endif
 343         /*
 344          * this is done by dtls1_reset_seq_numbers for DTLS
 345          */
 346         if (!SSL_CONNECTION_IS_DTLS(s))
 347             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 348     }
 349
 350     if (reuse_dd)
 351         EVP_CIPHER_CTX_reset(dd);
 352
 353     if (!(EVP_CIPHER_get_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 354         if (mac_type == EVP_PKEY_HMAC) {
 355             mac_key = EVP_PKEY_new_raw_private_key_ex(sctx->libctx, "HMAC",
 356                                                       sctx->propq, mac_secret,
 357                                                       mac_secret_size);
 358         } else {
 359             /*
 360              * If its not HMAC then the only other types of MAC we support are
 361              * the GOST MACs, so we need to use the old style way of creating
 362              * a MAC key.
 363              */
 364             mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
 365                                            (int)mac_secret_size);
 366         }
 367         if (mac_key == NULL
 368             || EVP_DigestSignInit_ex(mac_ctx, NULL, EVP_MD_get0_name(m),
 369                                      sctx->libctx, sctx->propq, mac_key,
 370                                      NULL) <= 0) {
 371             EVP_PKEY_free(mac_key);
 372             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 373             goto err;
 374         }
 375         EVP_PKEY_free(mac_key);
 376     }
 377
 378     OSSL_TRACE_BEGIN(TLS) {
 379         BIO_printf(trc_out, "which = %04X, mac key:\n", which);
 380         BIO_dump_indent(trc_out, mac_secret, i, 4);
 381     } OSSL_TRACE_END(TLS);
 382
 383     if (EVP_CIPHER_get_mode(c) == EVP_CIPH_GCM_MODE) {
 384         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 385             || EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
 386                                     iv) <= 0) {
 387             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 388             goto err;
 389         }
 390     } else if (EVP_CIPHER_get_mode(c) == EVP_CIPH_CCM_MODE) {
 391         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 392             || (EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL) <= 0)
 393             || (EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL) <= 0)
 394             || (EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv) <= 0)
 395             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 396             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 397             goto err;
 398         }
 399     } else {
 400         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 401             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 402             goto err;
 403         }
 404     }
 405     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 406     if ((EVP_CIPHER_get_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)
 407         && mac_secret_size != 0
 408         && EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 409                                (int)mac_secret_size, mac_secret) <= 0) {
 410         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 411         goto err;
 412     }
 413     if (EVP_CIPHER_get0_provider(c) != NULL
 414             && !tls_provider_set_tls_params(s, dd, c, m)) {
 415         /* SSLfatal already called */
 416         goto err;
 417     }
 418
 419 #ifndef OPENSSL_NO_KTLS
 420     if (s->compress || (s->options & SSL_OP_ENABLE_KTLS) == 0)
 421         goto skip_ktls;
 422
 423     /* ktls supports only the maximum fragment size */
 424     if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
 425         goto skip_ktls;
 426
 427     /* check that cipher is supported */
 428     if (!ktls_check_supported_cipher(s, c, m, taglen))
 429         goto skip_ktls;
 430
 431     if (which & SSL3_CC_WRITE)
 432         bio = s->wbio;
 433     else
 434         bio = s->rbio;
 435
 436     if (!ossl_assert(bio != NULL)) {
 437         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 438         goto err;
 439     }
 440
 441     /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
 442     if (which & SSL3_CC_WRITE) {
 443        if (BIO_flush(bio) <= 0)
 444            goto skip_ktls;
 445     }
 446
 447     /* ktls doesn't support renegotiation */
 448     if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) ||
 449         (BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) {
 450         SSLfatal(s, SSL_AD_NO_RENEGOTIATION, ERR_R_INTERNAL_ERROR);
 451         goto err;
 452     }
 453
 454     if (which & SSL3_CC_WRITE)
 455         rl_sequence = RECORD_LAYER_get_write_sequence(&s->rlayer);
 456     else
 457         rl_sequence = RECORD_LAYER_get_read_sequence(&s->rlayer);
 458
 459     if (!ktls_configure_crypto(s, c, rl_sequence, &crypto_info,
 460                                which & SSL3_CC_WRITE, iv, (size_t)k, key, cl,
 461                                mac_secret, mac_secret_size))
 462         goto skip_ktls;
 463
 464     /* ktls works with user provided buffers directly */
 465     if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) {
 466         if (which & SSL3_CC_WRITE)
 467             ssl3_release_write_buffer(s);
 468         SSL_set_options(SSL_CONNECTION_GET_SSL(s), SSL_OP_NO_RENEGOTIATION);
 469     }
 470
 471 #endif                          /* OPENSSL_NO_KTLS */
 472  skip_ktls:
 473     s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
 474
 475     OSSL_TRACE_BEGIN(TLS) {
 476         BIO_printf(trc_out, "which = %04X, key:\n", which);
 477         BIO_dump_indent(trc_out, key, EVP_CIPHER_get_key_length(c), 4);
 478         BIO_printf(trc_out, "iv:\n");
 479         BIO_dump_indent(trc_out, iv, k, 4);
 480     } OSSL_TRACE_END(TLS);
 481
 482     return 1;
 483  err:
 484     return 0;
 485 }
 486
 487 int tls1_setup_key_block(SSL_CONNECTION *s)
 488 {
 489     unsigned char *p;
 490     const EVP_CIPHER *c;
 491     const EVP_MD *hash;
 492     SSL_COMP *comp;
 493     int mac_type = NID_undef;
 494     size_t num, mac_secret_size = 0;
 495     int ret = 0;
 496     int ivlen;
 497
 498     if (s->s3.tmp.key_block_length != 0)
 499         return 1;
 500
 501     if (!ssl_cipher_get_evp(SSL_CONNECTION_GET_CTX(s), s->session, &c, &hash,
 502                             &mac_type, &mac_secret_size, &comp,
 503                             s->ext.use_etm)) {
 504         /* Error is already recorded */
 505         SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
 506         return 0;
 507     }
 508
 509     ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
 510     s->s3.tmp.new_sym_enc = c;
 511     ssl_evp_md_free(s->s3.tmp.new_hash);
 512     s->s3.tmp.new_hash = hash;
 513     s->s3.tmp.new_mac_pkey_type = mac_type;
 514     s->s3.tmp.new_mac_secret_size = mac_secret_size;
 515     ivlen = tls_iv_length_within_key_block(c);
 516     if (ivlen < 0) {
 517         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 518         return 0;
 519     }
 520     num = mac_secret_size + EVP_CIPHER_get_key_length(c) + ivlen;
 521     num *= 2;
 522
 523     ssl3_cleanup_key_block(s);
 524
 525     if ((p = OPENSSL_malloc(num)) == NULL) {
 526         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 527         goto err;
 528     }
 529
 530     s->s3.tmp.key_block_length = num;
 531     s->s3.tmp.key_block = p;
 532
 533     OSSL_TRACE_BEGIN(TLS) {
 534         BIO_printf(trc_out, "key block length: %zu\n", num);
 535         BIO_printf(trc_out, "client random\n");
 536         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 537         BIO_printf(trc_out, "server random\n");
 538         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 539         BIO_printf(trc_out, "master key\n");
 540         BIO_dump_indent(trc_out,
 541                         s->session->master_key,
 542                         s->session->master_key_length, 4);
 543     } OSSL_TRACE_END(TLS);
 544
 545     if (!tls1_generate_key_block(s, p, num)) {
 546         /* SSLfatal() already called */
 547         goto err;
 548     }
 549
 550     OSSL_TRACE_BEGIN(TLS) {
 551         BIO_printf(trc_out, "key block\n");
 552         BIO_dump_indent(trc_out, p, num, 4);
 553     } OSSL_TRACE_END(TLS);
 554
 555     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 556         && SSL_CONNECTION_GET_SSL(s)->method->version <= TLS1_VERSION) {
 557         /*
 558          * enable vulnerability countermeasure for CBC ciphers with known-IV
 559          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 560          */
 561         s->s3.need_empty_fragments = 1;
 562
 563         if (s->session->cipher != NULL) {
 564             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 565                 s->s3.need_empty_fragments = 0;
 566
 567             if (s->session->cipher->algorithm_enc == SSL_RC4)
 568                 s->s3.need_empty_fragments = 0;
 569         }
 570     }
 571
 572     ret = 1;
 573  err:
 574     return ret;
 575 }
 576
 577 size_t tls1_final_finish_mac(SSL_CONNECTION *s, const char *str,
 578                              size_t slen, unsigned char *out)
 579 {
 580     size_t hashlen;
 581     unsigned char hash[EVP_MAX_MD_SIZE];
 582     size_t finished_size = TLS1_FINISH_MAC_LENGTH;
 583
 584     if (s->s3.tmp.new_cipher->algorithm_mkey & SSL_kGOST18)
 585         finished_size = 32;
 586
 587     if (!ssl3_digest_cached_records(s, 0)) {
 588         /* SSLfatal() already called */
 589         return 0;
 590     }
 591
 592     if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 593         /* SSLfatal() already called */
 594         return 0;
 595     }
 596
 597     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 598                   s->session->master_key, s->session->master_key_length,
 599                   out, finished_size, 1)) {
 600         /* SSLfatal() already called */
 601         return 0;
 602     }
 603     OPENSSL_cleanse(hash, hashlen);
 604     return finished_size;
 605 }
 606
 607 int tls1_generate_master_secret(SSL_CONNECTION *s, unsigned char *out,
 608                                 unsigned char *p, size_t len,
 609                                 size_t *secret_size)
 610 {
 611     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 612         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 613         size_t hashlen;
 614         /*
 615          * Digest cached records keeping record buffer (if present): this won't
 616          * affect client auth because we're freezing the buffer at the same
 617          * point (after client key exchange and before certificate verify)
 618          */
 619         if (!ssl3_digest_cached_records(s, 1)
 620                 || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 621             /* SSLfatal() already called */
 622             return 0;
 623         }
 624         OSSL_TRACE_BEGIN(TLS) {
 625             BIO_printf(trc_out, "Handshake hashes:\n");
 626             BIO_dump(trc_out, (char *)hash, hashlen);
 627         } OSSL_TRACE_END(TLS);
 628         if (!tls1_PRF(s,
 629                       TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 630                       TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 631                       hash, hashlen,
 632                       NULL, 0,
 633                       NULL, 0,
 634                       NULL, 0, p, len, out,
 635                       SSL3_MASTER_SECRET_SIZE, 1)) {
 636             /* SSLfatal() already called */
 637             return 0;
 638         }
 639         OPENSSL_cleanse(hash, hashlen);
 640     } else {
 641         if (!tls1_PRF(s,
 642                       TLS_MD_MASTER_SECRET_CONST,
 643                       TLS_MD_MASTER_SECRET_CONST_SIZE,
 644                       s->s3.client_random, SSL3_RANDOM_SIZE,
 645                       NULL, 0,
 646                       s->s3.server_random, SSL3_RANDOM_SIZE,
 647                       NULL, 0, p, len, out,
 648                       SSL3_MASTER_SECRET_SIZE, 1)) {
 649            /* SSLfatal() already called */
 650             return 0;
 651         }
 652     }
 653
 654     OSSL_TRACE_BEGIN(TLS) {
 655         BIO_printf(trc_out, "Premaster Secret:\n");
 656         BIO_dump_indent(trc_out, p, len, 4);
 657         BIO_printf(trc_out, "Client Random:\n");
 658         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 659         BIO_printf(trc_out, "Server Random:\n");
 660         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 661         BIO_printf(trc_out, "Master Secret:\n");
 662         BIO_dump_indent(trc_out,
 663                         s->session->master_key,
 664                         SSL3_MASTER_SECRET_SIZE, 4);
 665     } OSSL_TRACE_END(TLS);
 666
 667     *secret_size = SSL3_MASTER_SECRET_SIZE;
 668     return 1;
 669 }
 670
 671 int tls1_export_keying_material(SSL_CONNECTION *s, unsigned char *out,
 672                                 size_t olen, const char *label, size_t llen,
 673                                 const unsigned char *context,
 674                                 size_t contextlen, int use_context)
 675 {
 676     unsigned char *val = NULL;
 677     size_t vallen = 0, currentvalpos;
 678     int rv;
 679
 680     /*
 681      * construct PRF arguments we construct the PRF argument ourself rather
 682      * than passing separate values into the TLS PRF to ensure that the
 683      * concatenation of values does not create a prohibited label.
 684      */
 685     vallen = llen + SSL3_RANDOM_SIZE * 2;
 686     if (use_context) {
 687         vallen += 2 + contextlen;
 688     }
 689
 690     val = OPENSSL_malloc(vallen);
 691     if (val == NULL)
 692         goto err2;
 693     currentvalpos = 0;
 694     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 695     currentvalpos += llen;
 696     memcpy(val + currentvalpos, s->s3.client_random, SSL3_RANDOM_SIZE);
 697     currentvalpos += SSL3_RANDOM_SIZE;
 698     memcpy(val + currentvalpos, s->s3.server_random, SSL3_RANDOM_SIZE);
 699     currentvalpos += SSL3_RANDOM_SIZE;
 700
 701     if (use_context) {
 702         val[currentvalpos] = (contextlen >> 8) & 0xff;
 703         currentvalpos++;
 704         val[currentvalpos] = contextlen & 0xff;
 705         currentvalpos++;
 706         if ((contextlen > 0) || (context != NULL)) {
 707             memcpy(val + currentvalpos, context, contextlen);
 708         }
 709     }
 710
 711     /*
 712      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 713      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 714      * the comparisons won't have buffer overflow
 715      */
 716     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 717                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 718         goto err1;
 719     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 720                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 721         goto err1;
 722     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 723                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 724         goto err1;
 725     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 726                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 727         goto err1;
 728     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 729                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 730         goto err1;
 731
 732     rv = tls1_PRF(s,
 733                   val, vallen,
 734                   NULL, 0,
 735                   NULL, 0,
 736                   NULL, 0,
 737                   NULL, 0,
 738                   s->session->master_key, s->session->master_key_length,
 739                   out, olen, 0);
 740
 741     goto ret;
 742  err1:
 743     ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 744     rv = 0;
 745     goto ret;
 746  err2:
 747     ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 748     rv = 0;
 749  ret:
 750     OPENSSL_clear_free(val, vallen);
 751     return rv;
 752 }
 753
 754 int tls1_alert_code(int code)
 755 {
 756     switch (code) {
 757     case SSL_AD_CLOSE_NOTIFY:
 758         return SSL3_AD_CLOSE_NOTIFY;
 759     case SSL_AD_UNEXPECTED_MESSAGE:
 760         return SSL3_AD_UNEXPECTED_MESSAGE;
 761     case SSL_AD_BAD_RECORD_MAC:
 762         return SSL3_AD_BAD_RECORD_MAC;
 763     case SSL_AD_DECRYPTION_FAILED:
 764         return TLS1_AD_DECRYPTION_FAILED;
 765     case SSL_AD_RECORD_OVERFLOW:
 766         return TLS1_AD_RECORD_OVERFLOW;
 767     case SSL_AD_DECOMPRESSION_FAILURE:
 768         return SSL3_AD_DECOMPRESSION_FAILURE;
 769     case SSL_AD_HANDSHAKE_FAILURE:
 770         return SSL3_AD_HANDSHAKE_FAILURE;
 771     case SSL_AD_NO_CERTIFICATE:
 772         return -1;
 773     case SSL_AD_BAD_CERTIFICATE:
 774         return SSL3_AD_BAD_CERTIFICATE;
 775     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 776         return SSL3_AD_UNSUPPORTED_CERTIFICATE;
 777     case SSL_AD_CERTIFICATE_REVOKED:
 778         return SSL3_AD_CERTIFICATE_REVOKED;
 779     case SSL_AD_CERTIFICATE_EXPIRED:
 780         return SSL3_AD_CERTIFICATE_EXPIRED;
 781     case SSL_AD_CERTIFICATE_UNKNOWN:
 782         return SSL3_AD_CERTIFICATE_UNKNOWN;
 783     case SSL_AD_ILLEGAL_PARAMETER:
 784         return SSL3_AD_ILLEGAL_PARAMETER;
 785     case SSL_AD_UNKNOWN_CA:
 786         return TLS1_AD_UNKNOWN_CA;
 787     case SSL_AD_ACCESS_DENIED:
 788         return TLS1_AD_ACCESS_DENIED;
 789     case SSL_AD_DECODE_ERROR:
 790         return TLS1_AD_DECODE_ERROR;
 791     case SSL_AD_DECRYPT_ERROR:
 792         return TLS1_AD_DECRYPT_ERROR;
 793     case SSL_AD_EXPORT_RESTRICTION:
 794         return TLS1_AD_EXPORT_RESTRICTION;
 795     case SSL_AD_PROTOCOL_VERSION:
 796         return TLS1_AD_PROTOCOL_VERSION;
 797     case SSL_AD_INSUFFICIENT_SECURITY:
 798         return TLS1_AD_INSUFFICIENT_SECURITY;
 799     case SSL_AD_INTERNAL_ERROR:
 800         return TLS1_AD_INTERNAL_ERROR;
 801     case SSL_AD_USER_CANCELLED:
 802         return TLS1_AD_USER_CANCELLED;
 803     case SSL_AD_NO_RENEGOTIATION:
 804         return TLS1_AD_NO_RENEGOTIATION;
 805     case SSL_AD_UNSUPPORTED_EXTENSION:
 806         return TLS1_AD_UNSUPPORTED_EXTENSION;
 807     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 808         return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
 809     case SSL_AD_UNRECOGNIZED_NAME:
 810         return TLS1_AD_UNRECOGNIZED_NAME;
 811     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 812         return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
 813     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 814         return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
 815     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 816         return TLS1_AD_UNKNOWN_PSK_IDENTITY;
 817     case SSL_AD_INAPPROPRIATE_FALLBACK:
 818         return TLS1_AD_INAPPROPRIATE_FALLBACK;
 819     case SSL_AD_NO_APPLICATION_PROTOCOL:
 820         return TLS1_AD_NO_APPLICATION_PROTOCOL;
 821     case SSL_AD_CERTIFICATE_REQUIRED:
 822         return SSL_AD_HANDSHAKE_FAILURE;
 823     case TLS13_AD_MISSING_EXTENSION:
 824         return SSL_AD_HANDSHAKE_FAILURE;
 825     default:
 826         return -1;
 827     }
 828 }