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