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