ssl/t1_enc.c

   1 /*
   2  * Copyright 1995-2021 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 *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(s->ctx->libctx, OSSL_KDF_NAME_TLS1_PRF, s->ctx->propq);
  49     if (kdf == NULL)
  50         goto err;
  51     kctx = EVP_KDF_CTX_new(kdf);
  52     EVP_KDF_free(kdf);
  53     if (kctx == NULL)
  54         goto err;
  55     mdname = EVP_MD_name(md);
  56     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
  57                                             (char *)mdname, 0);
  58     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET,
  59                                              (unsigned char *)sec,
  60                                              (size_t)slen);
  61     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  62                                              (void *)seed1, (size_t)seed1_len);
  63     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  64                                              (void *)seed2, (size_t)seed2_len);
  65     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  66                                              (void *)seed3, (size_t)seed3_len);
  67     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  68                                              (void *)seed4, (size_t)seed4_len);
  69     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  70                                              (void *)seed5, (size_t)seed5_len);
  71     *p = OSSL_PARAM_construct_end();
  72     if (EVP_KDF_CTX_set_params(kctx, params)
  73             && EVP_KDF_derive(kctx, out, olen)) {
  74         EVP_KDF_CTX_free(kctx);
  75         return 1;
  76     }
  77
  78  err:
  79     if (fatal)
  80         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
  81     else
  82         ERR_raise(ERR_LIB_SSL, ERR_R_INTERNAL_ERROR);
  83     EVP_KDF_CTX_free(kctx);
  84     return 0;
  85 }
  86
  87 static int tls1_generate_key_block(SSL *s, unsigned char *km, size_t num)
  88 {
  89     int ret;
  90
  91     /* Calls SSLfatal() as required */
  92     ret = tls1_PRF(s,
  93                    TLS_MD_KEY_EXPANSION_CONST,
  94                    TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3.server_random,
  95                    SSL3_RANDOM_SIZE, s->s3.client_random, SSL3_RANDOM_SIZE,
  96                    NULL, 0, NULL, 0, s->session->master_key,
  97                    s->session->master_key_length, km, num, 1);
  98
  99     return ret;
 100 }
 101
 102 #ifndef OPENSSL_NO_KTLS
 103  /*
 104   * Count the number of records that were not processed yet from record boundary.
 105   *
 106   * This function assumes that there are only fully formed records read in the
 107   * record layer. If read_ahead is enabled, then this might be false and this
 108   * function will fail.
 109   */
 110 # ifndef OPENSSL_NO_KTLS_RX
 111 static int count_unprocessed_records(SSL *s)
 112 {
 113     SSL3_BUFFER *rbuf = RECORD_LAYER_get_rbuf(&s->rlayer);
 114     PACKET pkt, subpkt;
 115     int count = 0;
 116
 117     if (!PACKET_buf_init(&pkt, rbuf->buf + rbuf->offset, rbuf->left))
 118         return -1;
 119
 120     while (PACKET_remaining(&pkt) > 0) {
 121         /* Skip record type and version */
 122         if (!PACKET_forward(&pkt, 3))
 123             return -1;
 124
 125         /* Read until next record */
 126         if (PACKET_get_length_prefixed_2(&pkt, &subpkt))
 127             return -1;
 128
 129         count += 1;
 130     }
 131
 132     return count;
 133 }
 134 # endif
 135 #endif
 136
 137
 138 int tls_provider_set_tls_params(SSL *s, EVP_CIPHER_CTX *ctx,
 139                                 const EVP_CIPHER *ciph,
 140                                 const EVP_MD *md)
 141 {
 142     /*
 143      * Provided cipher, the TLS padding/MAC removal is performed provider
 144      * side so we need to tell the ctx about our TLS version and mac size
 145      */
 146     OSSL_PARAM params[3], *pprm = params;
 147     size_t macsize = 0;
 148     int imacsize = -1;
 149
 150     if ((EVP_CIPHER_flags(ciph) & EVP_CIPH_FLAG_AEAD_CIPHER) == 0
 151                /*
 152                 * We look at s->ext.use_etm instead of SSL_READ_ETM() or
 153                 * SSL_WRITE_ETM() because this test applies to both reading
 154                 * and writing.
 155                 */
 156             && !s->ext.use_etm)
 157         imacsize = EVP_MD_size(md);
 158     if (imacsize >= 0)
 159         macsize = (size_t)imacsize;
 160
 161     *pprm++ = OSSL_PARAM_construct_int(OSSL_CIPHER_PARAM_TLS_VERSION,
 162                                        &s->version);
 163     *pprm++ = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_TLS_MAC_SIZE,
 164                                           &macsize);
 165     *pprm = OSSL_PARAM_construct_end();
 166
 167     if (!EVP_CIPHER_CTX_set_params(ctx, params)) {
 168         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 169         return 0;
 170     }
 171
 172     return 1;
 173 }
 174
 175
 176 static int tls_iv_length_within_key_block(const EVP_CIPHER *c)
 177 {
 178     /* If GCM/CCM mode only part of IV comes from PRF */
 179     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 180         return EVP_GCM_TLS_FIXED_IV_LEN;
 181     else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
 182         return EVP_CCM_TLS_FIXED_IV_LEN;
 183     else
 184         return EVP_CIPHER_iv_length(c);
 185 }
 186
 187 int tls1_change_cipher_state(SSL *s, int which)
 188 {
 189     unsigned char *p, *mac_secret;
 190     unsigned char *ms, *key, *iv;
 191     EVP_CIPHER_CTX *dd;
 192     const EVP_CIPHER *c;
 193 #ifndef OPENSSL_NO_COMP
 194     const SSL_COMP *comp;
 195 #endif
 196     const EVP_MD *m;
 197     int mac_type;
 198     size_t *mac_secret_size;
 199     EVP_MD_CTX *mac_ctx;
 200     EVP_PKEY *mac_key;
 201     size_t n, i, j, k, cl;
 202     int reuse_dd = 0;
 203 #ifndef OPENSSL_NO_KTLS
 204     ktls_crypto_info_t crypto_info;
 205     unsigned char *rec_seq;
 206     void *rl_sequence;
 207 # ifndef OPENSSL_NO_KTLS_RX
 208     int count_unprocessed;
 209     int bit;
 210 # endif
 211     BIO *bio;
 212 #endif
 213
 214     c = s->s3.tmp.new_sym_enc;
 215     m = s->s3.tmp.new_hash;
 216     mac_type = s->s3.tmp.new_mac_pkey_type;
 217 #ifndef OPENSSL_NO_COMP
 218     comp = s->s3.tmp.new_compression;
 219 #endif
 220
 221     if (which & SSL3_CC_READ) {
 222         if (s->ext.use_etm)
 223             s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 224         else
 225             s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 226
 227         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 228             s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 229         else
 230             s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 231
 232         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
 233             s->mac_flags |= SSL_MAC_FLAG_READ_MAC_TLSTREE;
 234         else
 235             s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_TLSTREE;
 236
 237         if (s->enc_read_ctx != NULL) {
 238             reuse_dd = 1;
 239         } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 240             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 241             goto err;
 242         } else {
 243             /*
 244              * make sure it's initialised in case we exit later with an error
 245              */
 246             EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 247         }
 248         dd = s->enc_read_ctx;
 249         mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 250         if (mac_ctx == NULL) {
 251             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 252             goto err;
 253         }
 254 #ifndef OPENSSL_NO_COMP
 255         COMP_CTX_free(s->expand);
 256         s->expand = NULL;
 257         if (comp != NULL) {
 258             s->expand = COMP_CTX_new(comp->method);
 259             if (s->expand == NULL) {
 260                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 261                          SSL_R_COMPRESSION_LIBRARY_ERROR);
 262                 goto err;
 263             }
 264         }
 265 #endif
 266         /*
 267          * this is done by dtls1_reset_seq_numbers for DTLS
 268          */
 269         if (!SSL_IS_DTLS(s))
 270             RECORD_LAYER_reset_read_sequence(&s->rlayer);
 271         mac_secret = &(s->s3.read_mac_secret[0]);
 272         mac_secret_size = &(s->s3.read_mac_secret_size);
 273     } else {
 274         s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
 275         if (s->ext.use_etm)
 276             s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 277         else
 278             s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 279
 280         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 281             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 282         else
 283             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 284
 285         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
 286             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
 287         else
 288             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
 289         if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
 290             reuse_dd = 1;
 291         } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 292             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 293             goto err;
 294         }
 295         dd = s->enc_write_ctx;
 296         if (SSL_IS_DTLS(s)) {
 297             mac_ctx = EVP_MD_CTX_new();
 298             if (mac_ctx == NULL) {
 299                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 300                 goto err;
 301             }
 302             s->write_hash = mac_ctx;
 303         } else {
 304             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 305             if (mac_ctx == NULL) {
 306                 SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 307                 goto err;
 308             }
 309         }
 310 #ifndef OPENSSL_NO_COMP
 311         COMP_CTX_free(s->compress);
 312         s->compress = NULL;
 313         if (comp != NULL) {
 314             s->compress = COMP_CTX_new(comp->method);
 315             if (s->compress == NULL) {
 316                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 317                          SSL_R_COMPRESSION_LIBRARY_ERROR);
 318                 goto err;
 319             }
 320         }
 321 #endif
 322         /*
 323          * this is done by dtls1_reset_seq_numbers for DTLS
 324          */
 325         if (!SSL_IS_DTLS(s))
 326             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 327         mac_secret = &(s->s3.write_mac_secret[0]);
 328         mac_secret_size = &(s->s3.write_mac_secret_size);
 329     }
 330
 331     if (reuse_dd)
 332         EVP_CIPHER_CTX_reset(dd);
 333
 334     p = s->s3.tmp.key_block;
 335     i = *mac_secret_size = s->s3.tmp.new_mac_secret_size;
 336
 337     /* TODO(size_t): convert me */
 338     cl = EVP_CIPHER_key_length(c);
 339     j = cl;
 340     k = tls_iv_length_within_key_block(c);
 341     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 342         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
 343         ms = &(p[0]);
 344         n = i + i;
 345         key = &(p[n]);
 346         n += j + j;
 347         iv = &(p[n]);
 348         n += k + k;
 349     } else {
 350         n = i;
 351         ms = &(p[n]);
 352         n += i + j;
 353         key = &(p[n]);
 354         n += j + k;
 355         iv = &(p[n]);
 356         n += k;
 357     }
 358
 359     if (n > s->s3.tmp.key_block_length) {
 360         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 361         goto err;
 362     }
 363
 364     memcpy(mac_secret, ms, i);
 365
 366     if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 367         if (mac_type == EVP_PKEY_HMAC) {
 368             mac_key = EVP_PKEY_new_raw_private_key_ex(s->ctx->libctx, "HMAC",
 369                                                       s->ctx->propq, mac_secret,
 370                                                       *mac_secret_size);
 371         } else {
 372             /*
 373              * If its not HMAC then the only other types of MAC we support are
 374              * the GOST MACs, so we need to use the old style way of creating
 375              * a MAC key.
 376              */
 377             mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
 378                                            (int)*mac_secret_size);
 379         }
 380         if (mac_key == NULL
 381             || EVP_DigestSignInit_ex(mac_ctx, NULL, EVP_MD_name(m),
 382                                      s->ctx->libctx, s->ctx->propq, mac_key) <= 0) {
 383             EVP_PKEY_free(mac_key);
 384             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 385             goto err;
 386         }
 387         EVP_PKEY_free(mac_key);
 388     }
 389
 390     OSSL_TRACE_BEGIN(TLS) {
 391         BIO_printf(trc_out, "which = %04X, mac key:\n", which);
 392         BIO_dump_indent(trc_out, ms, i, 4);
 393     } OSSL_TRACE_END(TLS);
 394
 395     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
 396         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 397             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
 398                                     iv)) {
 399             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 400             goto err;
 401         }
 402     } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
 403         int taglen;
 404         if (s->s3.tmp.
 405             new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
 406             taglen = EVP_CCM8_TLS_TAG_LEN;
 407         else
 408             taglen = EVP_CCM_TLS_TAG_LEN;
 409         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 410             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
 411             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
 412             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
 413             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 414             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 415             goto err;
 416         }
 417     } else {
 418         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 419             SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 420             goto err;
 421         }
 422     }
 423     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 424     if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
 425         && !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 426                                 (int)*mac_secret_size, mac_secret)) {
 427         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 428         goto err;
 429     }
 430     if (EVP_CIPHER_provider(c) != NULL
 431             && !tls_provider_set_tls_params(s, dd, c, m)) {
 432         /* SSLfatal already called */
 433         goto err;
 434     }
 435
 436 #ifndef OPENSSL_NO_KTLS
 437     if (s->compress)
 438         goto skip_ktls;
 439
 440     if (((which & SSL3_CC_READ) && (s->mode & SSL_MODE_NO_KTLS_RX))
 441         || ((which & SSL3_CC_WRITE) && (s->mode & SSL_MODE_NO_KTLS_TX)))
 442         goto skip_ktls;
 443
 444     /* ktls supports only the maximum fragment size */
 445     if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
 446         goto skip_ktls;
 447
 448     /* check that cipher is supported */
 449     if (!ktls_check_supported_cipher(s, c, dd))
 450         goto skip_ktls;
 451
 452     if (which & SSL3_CC_WRITE)
 453         bio = s->wbio;
 454     else
 455         bio = s->rbio;
 456
 457     if (!ossl_assert(bio != NULL)) {
 458         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
 459         goto err;
 460     }
 461
 462     /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
 463     if (which & SSL3_CC_WRITE) {
 464        if (BIO_flush(bio) <= 0)
 465            goto skip_ktls;
 466     }
 467
 468     /* ktls doesn't support renegotiation */
 469     if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) ||
 470         (BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) {
 471         SSLfatal(s, SSL_AD_NO_RENEGOTIATION, ERR_R_INTERNAL_ERROR);
 472         goto err;
 473     }
 474
 475     if (which & SSL3_CC_WRITE)
 476         rl_sequence = RECORD_LAYER_get_write_sequence(&s->rlayer);
 477     else
 478         rl_sequence = RECORD_LAYER_get_read_sequence(&s->rlayer);
 479
 480     if (!ktls_configure_crypto(s, c, dd, rl_sequence, &crypto_info, &rec_seq,
 481                                iv, key, ms, *mac_secret_size))
 482         goto skip_ktls;
 483
 484     if (which & SSL3_CC_READ) {
 485 # ifndef OPENSSL_NO_KTLS_RX
 486         count_unprocessed = count_unprocessed_records(s);
 487         if (count_unprocessed < 0)
 488             goto skip_ktls;
 489
 490         /* increment the crypto_info record sequence */
 491         while (count_unprocessed) {
 492             for (bit = 7; bit >= 0; bit--) { /* increment */
 493                 ++rec_seq[bit];
 494                 if (rec_seq[bit] != 0)
 495                     break;
 496             }
 497             count_unprocessed--;
 498         }
 499 # else
 500         goto skip_ktls;
 501 # endif
 502     }
 503
 504     /* ktls works with user provided buffers directly */
 505     if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) {
 506         if (which & SSL3_CC_WRITE)
 507             ssl3_release_write_buffer(s);
 508         SSL_set_options(s, SSL_OP_NO_RENEGOTIATION);
 509     }
 510
 511  skip_ktls:
 512 #endif                          /* OPENSSL_NO_KTLS */
 513     s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
 514
 515     OSSL_TRACE_BEGIN(TLS) {
 516         BIO_printf(trc_out, "which = %04X, key:\n", which);
 517         BIO_dump_indent(trc_out, key, EVP_CIPHER_key_length(c), 4);
 518         BIO_printf(trc_out, "iv:\n");
 519         BIO_dump_indent(trc_out, iv, k, 4);
 520     } OSSL_TRACE_END(TLS);
 521
 522     return 1;
 523  err:
 524     return 0;
 525 }
 526
 527 int tls1_setup_key_block(SSL *s)
 528 {
 529     unsigned char *p;
 530     const EVP_CIPHER *c;
 531     const EVP_MD *hash;
 532     SSL_COMP *comp;
 533     int mac_type = NID_undef;
 534     size_t num, mac_secret_size = 0;
 535     int ret = 0;
 536
 537     if (s->s3.tmp.key_block_length != 0)
 538         return 1;
 539
 540     if (!ssl_cipher_get_evp(s->ctx, s->session, &c, &hash, &mac_type,
 541                             &mac_secret_size, &comp, s->ext.use_etm)) {
 542         /* Error is already recorded */
 543         SSLfatal_alert(s, SSL_AD_INTERNAL_ERROR);
 544         return 0;
 545     }
 546
 547     ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
 548     s->s3.tmp.new_sym_enc = c;
 549     ssl_evp_md_free(s->s3.tmp.new_hash);
 550     s->s3.tmp.new_hash = hash;
 551     s->s3.tmp.new_mac_pkey_type = mac_type;
 552     s->s3.tmp.new_mac_secret_size = mac_secret_size;
 553     num = mac_secret_size + EVP_CIPHER_key_length(c) + tls_iv_length_within_key_block(c);
 554     num *= 2;
 555
 556     ssl3_cleanup_key_block(s);
 557
 558     if ((p = OPENSSL_malloc(num)) == NULL) {
 559         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_MALLOC_FAILURE);
 560         goto err;
 561     }
 562
 563     s->s3.tmp.key_block_length = num;
 564     s->s3.tmp.key_block = p;
 565
 566     OSSL_TRACE_BEGIN(TLS) {
 567         BIO_printf(trc_out, "key block length: %ld\n", num);
 568         BIO_printf(trc_out, "client random\n");
 569         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 570         BIO_printf(trc_out, "server random\n");
 571         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 572         BIO_printf(trc_out, "master key\n");
 573         BIO_dump_indent(trc_out,
 574                         s->session->master_key,
 575                         s->session->master_key_length, 4);
 576     } OSSL_TRACE_END(TLS);
 577
 578     if (!tls1_generate_key_block(s, p, num)) {
 579         /* SSLfatal() already called */
 580         goto err;
 581     }
 582
 583     OSSL_TRACE_BEGIN(TLS) {
 584         BIO_printf(trc_out, "key block\n");
 585         BIO_dump_indent(trc_out, p, num, 4);
 586     } OSSL_TRACE_END(TLS);
 587
 588     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 589         && s->method->version <= TLS1_VERSION) {
 590         /*
 591          * enable vulnerability countermeasure for CBC ciphers with known-IV
 592          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 593          */
 594         s->s3.need_empty_fragments = 1;
 595
 596         if (s->session->cipher != NULL) {
 597             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 598                 s->s3.need_empty_fragments = 0;
 599
 600             if (s->session->cipher->algorithm_enc == SSL_RC4)
 601                 s->s3.need_empty_fragments = 0;
 602         }
 603     }
 604
 605     ret = 1;
 606  err:
 607     return ret;
 608 }
 609
 610 size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
 611                              unsigned char *out)
 612 {
 613     size_t hashlen;
 614     unsigned char hash[EVP_MAX_MD_SIZE];
 615     size_t finished_size = TLS1_FINISH_MAC_LENGTH;
 616
 617     if (s->s3.tmp.new_cipher->algorithm_mkey & SSL_kGOST18)
 618         finished_size = 32;
 619
 620     if (!ssl3_digest_cached_records(s, 0)) {
 621         /* SSLfatal() already called */
 622         return 0;
 623     }
 624
 625     if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 626         /* SSLfatal() already called */
 627         return 0;
 628     }
 629
 630     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 631                   s->session->master_key, s->session->master_key_length,
 632                   out, finished_size, 1)) {
 633         /* SSLfatal() already called */
 634         return 0;
 635     }
 636     OPENSSL_cleanse(hash, hashlen);
 637     return finished_size;
 638 }
 639
 640 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 641                                 size_t len, size_t *secret_size)
 642 {
 643     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 644         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 645         size_t hashlen;
 646         /*
 647          * Digest cached records keeping record buffer (if present): this won't
 648          * affect client auth because we're freezing the buffer at the same
 649          * point (after client key exchange and before certificate verify)
 650          */
 651         if (!ssl3_digest_cached_records(s, 1)
 652                 || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 653             /* SSLfatal() already called */
 654             return 0;
 655         }
 656         OSSL_TRACE_BEGIN(TLS) {
 657             BIO_printf(trc_out, "Handshake hashes:\n");
 658             BIO_dump(trc_out, (char *)hash, hashlen);
 659         } OSSL_TRACE_END(TLS);
 660         if (!tls1_PRF(s,
 661                       TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 662                       TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 663                       hash, hashlen,
 664                       NULL, 0,
 665                       NULL, 0,
 666                       NULL, 0, p, len, out,
 667                       SSL3_MASTER_SECRET_SIZE, 1)) {
 668             /* SSLfatal() already called */
 669             return 0;
 670         }
 671         OPENSSL_cleanse(hash, hashlen);
 672     } else {
 673         if (!tls1_PRF(s,
 674                       TLS_MD_MASTER_SECRET_CONST,
 675                       TLS_MD_MASTER_SECRET_CONST_SIZE,
 676                       s->s3.client_random, SSL3_RANDOM_SIZE,
 677                       NULL, 0,
 678                       s->s3.server_random, SSL3_RANDOM_SIZE,
 679                       NULL, 0, p, len, out,
 680                       SSL3_MASTER_SECRET_SIZE, 1)) {
 681            /* SSLfatal() already called */
 682             return 0;
 683         }
 684     }
 685
 686     OSSL_TRACE_BEGIN(TLS) {
 687         BIO_printf(trc_out, "Premaster Secret:\n");
 688         BIO_dump_indent(trc_out, p, len, 4);
 689         BIO_printf(trc_out, "Client Random:\n");
 690         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 691         BIO_printf(trc_out, "Server Random:\n");
 692         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 693         BIO_printf(trc_out, "Master Secret:\n");
 694         BIO_dump_indent(trc_out,
 695                         s->session->master_key,
 696                         SSL3_MASTER_SECRET_SIZE, 4);
 697     } OSSL_TRACE_END(TLS);
 698
 699     *secret_size = SSL3_MASTER_SECRET_SIZE;
 700     return 1;
 701 }
 702
 703 int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 704                                 const char *label, size_t llen,
 705                                 const unsigned char *context,
 706                                 size_t contextlen, int use_context)
 707 {
 708     unsigned char *val = NULL;
 709     size_t vallen = 0, currentvalpos;
 710     int rv;
 711
 712     /*
 713      * construct PRF arguments we construct the PRF argument ourself rather
 714      * than passing separate values into the TLS PRF to ensure that the
 715      * concatenation of values does not create a prohibited label.
 716      */
 717     vallen = llen + SSL3_RANDOM_SIZE * 2;
 718     if (use_context) {
 719         vallen += 2 + contextlen;
 720     }
 721
 722     val = OPENSSL_malloc(vallen);
 723     if (val == NULL)
 724         goto err2;
 725     currentvalpos = 0;
 726     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 727     currentvalpos += llen;
 728     memcpy(val + currentvalpos, s->s3.client_random, SSL3_RANDOM_SIZE);
 729     currentvalpos += SSL3_RANDOM_SIZE;
 730     memcpy(val + currentvalpos, s->s3.server_random, SSL3_RANDOM_SIZE);
 731     currentvalpos += SSL3_RANDOM_SIZE;
 732
 733     if (use_context) {
 734         val[currentvalpos] = (contextlen >> 8) & 0xff;
 735         currentvalpos++;
 736         val[currentvalpos] = contextlen & 0xff;
 737         currentvalpos++;
 738         if ((contextlen > 0) || (context != NULL)) {
 739             memcpy(val + currentvalpos, context, contextlen);
 740         }
 741     }
 742
 743     /*
 744      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 745      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 746      * the comparisons won't have buffer overflow
 747      */
 748     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 749                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 750         goto err1;
 751     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 752                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 753         goto err1;
 754     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 755                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 756         goto err1;
 757     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 758                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 759         goto err1;
 760     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 761                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 762         goto err1;
 763
 764     rv = tls1_PRF(s,
 765                   val, vallen,
 766                   NULL, 0,
 767                   NULL, 0,
 768                   NULL, 0,
 769                   NULL, 0,
 770                   s->session->master_key, s->session->master_key_length,
 771                   out, olen, 0);
 772
 773     goto ret;
 774  err1:
 775     ERR_raise(ERR_LIB_SSL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 776     rv = 0;
 777     goto ret;
 778  err2:
 779     ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 780     rv = 0;
 781  ret:
 782     OPENSSL_clear_free(val, vallen);
 783     return rv;
 784 }
 785
 786 int tls1_alert_code(int code)
 787 {
 788     switch (code) {
 789     case SSL_AD_CLOSE_NOTIFY:
 790         return SSL3_AD_CLOSE_NOTIFY;
 791     case SSL_AD_UNEXPECTED_MESSAGE:
 792         return SSL3_AD_UNEXPECTED_MESSAGE;
 793     case SSL_AD_BAD_RECORD_MAC:
 794         return SSL3_AD_BAD_RECORD_MAC;
 795     case SSL_AD_DECRYPTION_FAILED:
 796         return TLS1_AD_DECRYPTION_FAILED;
 797     case SSL_AD_RECORD_OVERFLOW:
 798         return TLS1_AD_RECORD_OVERFLOW;
 799     case SSL_AD_DECOMPRESSION_FAILURE:
 800         return SSL3_AD_DECOMPRESSION_FAILURE;
 801     case SSL_AD_HANDSHAKE_FAILURE:
 802         return SSL3_AD_HANDSHAKE_FAILURE;
 803     case SSL_AD_NO_CERTIFICATE:
 804         return -1;
 805     case SSL_AD_BAD_CERTIFICATE:
 806         return SSL3_AD_BAD_CERTIFICATE;
 807     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 808         return SSL3_AD_UNSUPPORTED_CERTIFICATE;
 809     case SSL_AD_CERTIFICATE_REVOKED:
 810         return SSL3_AD_CERTIFICATE_REVOKED;
 811     case SSL_AD_CERTIFICATE_EXPIRED:
 812         return SSL3_AD_CERTIFICATE_EXPIRED;
 813     case SSL_AD_CERTIFICATE_UNKNOWN:
 814         return SSL3_AD_CERTIFICATE_UNKNOWN;
 815     case SSL_AD_ILLEGAL_PARAMETER:
 816         return SSL3_AD_ILLEGAL_PARAMETER;
 817     case SSL_AD_UNKNOWN_CA:
 818         return TLS1_AD_UNKNOWN_CA;
 819     case SSL_AD_ACCESS_DENIED:
 820         return TLS1_AD_ACCESS_DENIED;
 821     case SSL_AD_DECODE_ERROR:
 822         return TLS1_AD_DECODE_ERROR;
 823     case SSL_AD_DECRYPT_ERROR:
 824         return TLS1_AD_DECRYPT_ERROR;
 825     case SSL_AD_EXPORT_RESTRICTION:
 826         return TLS1_AD_EXPORT_RESTRICTION;
 827     case SSL_AD_PROTOCOL_VERSION:
 828         return TLS1_AD_PROTOCOL_VERSION;
 829     case SSL_AD_INSUFFICIENT_SECURITY:
 830         return TLS1_AD_INSUFFICIENT_SECURITY;
 831     case SSL_AD_INTERNAL_ERROR:
 832         return TLS1_AD_INTERNAL_ERROR;
 833     case SSL_AD_USER_CANCELLED:
 834         return TLS1_AD_USER_CANCELLED;
 835     case SSL_AD_NO_RENEGOTIATION:
 836         return TLS1_AD_NO_RENEGOTIATION;
 837     case SSL_AD_UNSUPPORTED_EXTENSION:
 838         return TLS1_AD_UNSUPPORTED_EXTENSION;
 839     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 840         return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
 841     case SSL_AD_UNRECOGNIZED_NAME:
 842         return TLS1_AD_UNRECOGNIZED_NAME;
 843     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 844         return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
 845     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 846         return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
 847     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 848         return TLS1_AD_UNKNOWN_PSK_IDENTITY;
 849     case SSL_AD_INAPPROPRIATE_FALLBACK:
 850         return TLS1_AD_INAPPROPRIATE_FALLBACK;
 851     case SSL_AD_NO_APPLICATION_PROTOCOL:
 852         return TLS1_AD_NO_APPLICATION_PROTOCOL;
 853     case SSL_AD_CERTIFICATE_REQUIRED:
 854         return SSL_AD_HANDSHAKE_FAILURE;
 855     default:
 856         return -1;
 857     }
 858 }