ssl/t1_enc.c

   1 /*
   2  * Copyright 1995-2018 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, SSL_F_TLS1_PRF,
  44                      ERR_R_INTERNAL_ERROR);
  45         else
  46             SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  47         return 0;
  48     }
  49     kdf = EVP_KDF_fetch(s->ctx->libctx, OSSL_KDF_NAME_TLS1_PRF, s->ctx->propq);
  50     if (kdf == NULL)
  51         goto err;
  52     kctx = EVP_KDF_CTX_new(kdf);
  53     EVP_KDF_free(kdf);
  54     if (kctx == NULL)
  55         goto err;
  56     mdname = EVP_MD_name(md);
  57     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
  58                                             (char *)mdname, 0);
  59     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET,
  60                                              (unsigned char *)sec,
  61                                              (size_t)slen);
  62     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  63                                              (void *)seed1, (size_t)seed1_len);
  64     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  65                                              (void *)seed2, (size_t)seed2_len);
  66     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  67                                              (void *)seed3, (size_t)seed3_len);
  68     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  69                                              (void *)seed4, (size_t)seed4_len);
  70     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
  71                                              (void *)seed5, (size_t)seed5_len);
  72     *p = OSSL_PARAM_construct_end();
  73     if (EVP_KDF_CTX_set_params(kctx, params)
  74             && EVP_KDF_derive(kctx, out, olen)) {
  75         EVP_KDF_CTX_free(kctx);
  76         return 1;
  77     }
  78
  79  err:
  80     if (fatal)
  81         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
  82                  ERR_R_INTERNAL_ERROR);
  83     else
  84         SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  85     EVP_KDF_CTX_free(kctx);
  86     return 0;
  87 }
  88
  89 static int tls1_generate_key_block(SSL *s, unsigned char *km, 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 #ifndef OPENSSL_NO_KTLS
 105  /*
 106   * Count the number of records that were not processed yet from record boundary.
 107   *
 108   * This function assumes that there are only fully formed records read in the
 109   * record layer. If read_ahead is enabled, then this might be false and this
 110   * function will fail.
 111   */
 112 static int count_unprocessed_records(SSL *s)
 113 {
 114     SSL3_BUFFER *rbuf = RECORD_LAYER_get_rbuf(&s->rlayer);
 115     PACKET pkt, subpkt;
 116     int count = 0;
 117
 118     if (!PACKET_buf_init(&pkt, rbuf->buf + rbuf->offset, rbuf->left))
 119         return -1;
 120
 121     while (PACKET_remaining(&pkt) > 0) {
 122         /* Skip record type and version */
 123         if (!PACKET_forward(&pkt, 3))
 124             return -1;
 125
 126         /* Read until next record */
 127         if (PACKET_get_length_prefixed_2(&pkt, &subpkt))
 128             return -1;
 129
 130         count += 1;
 131     }
 132
 133     return count;
 134 }
 135 #endif
 136
 137 int tls1_change_cipher_state(SSL *s, int which)
 138 {
 139     unsigned char *p, *mac_secret;
 140     unsigned char *ms, *key, *iv;
 141     EVP_CIPHER_CTX *dd;
 142     const EVP_CIPHER *c;
 143 #ifndef OPENSSL_NO_COMP
 144     const SSL_COMP *comp;
 145 #endif
 146     const EVP_MD *m;
 147     int mac_type;
 148     size_t *mac_secret_size;
 149     EVP_MD_CTX *mac_ctx;
 150     EVP_PKEY *mac_key;
 151     size_t n, i, j, k, cl;
 152     int reuse_dd = 0;
 153 #ifndef OPENSSL_NO_KTLS
 154 # ifdef __FreeBSD__
 155     struct tls_enable crypto_info;
 156 # else
 157     struct tls12_crypto_info_aes_gcm_128 crypto_info;
 158     unsigned char geniv[12];
 159     int count_unprocessed;
 160     int bit;
 161 # endif
 162     BIO *bio;
 163 #endif
 164
 165     c = s->s3.tmp.new_sym_enc;
 166     m = s->s3.tmp.new_hash;
 167     mac_type = s->s3.tmp.new_mac_pkey_type;
 168 #ifndef OPENSSL_NO_COMP
 169     comp = s->s3.tmp.new_compression;
 170 #endif
 171
 172     if (which & SSL3_CC_READ) {
 173         if (s->ext.use_etm)
 174             s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 175         else
 176             s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 177
 178         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 179             s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 180         else
 181             s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 182
 183         if (s->enc_read_ctx != NULL) {
 184             reuse_dd = 1;
 185         } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 186             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 187                      ERR_R_MALLOC_FAILURE);
 188             goto err;
 189         } else {
 190             /*
 191              * make sure it's initialised in case we exit later with an error
 192              */
 193             EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 194         }
 195         dd = s->enc_read_ctx;
 196         mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 197         if (mac_ctx == NULL) {
 198             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 199                      ERR_R_INTERNAL_ERROR);
 200             goto err;
 201         }
 202 #ifndef OPENSSL_NO_COMP
 203         COMP_CTX_free(s->expand);
 204         s->expand = NULL;
 205         if (comp != NULL) {
 206             s->expand = COMP_CTX_new(comp->method);
 207             if (s->expand == NULL) {
 208                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 209                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 210                          SSL_R_COMPRESSION_LIBRARY_ERROR);
 211                 goto err;
 212             }
 213         }
 214 #endif
 215         /*
 216          * this is done by dtls1_reset_seq_numbers for DTLS
 217          */
 218         if (!SSL_IS_DTLS(s))
 219             RECORD_LAYER_reset_read_sequence(&s->rlayer);
 220         mac_secret = &(s->s3.read_mac_secret[0]);
 221         mac_secret_size = &(s->s3.read_mac_secret_size);
 222     } else {
 223         s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
 224         if (s->ext.use_etm)
 225             s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 226         else
 227             s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 228
 229         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 230             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 231         else
 232             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 233         if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
 234             reuse_dd = 1;
 235         } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 236             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 237                      ERR_R_MALLOC_FAILURE);
 238             goto err;
 239         }
 240         dd = s->enc_write_ctx;
 241         if (SSL_IS_DTLS(s)) {
 242             mac_ctx = EVP_MD_CTX_new();
 243             if (mac_ctx == NULL) {
 244                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 245                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 246                          ERR_R_MALLOC_FAILURE);
 247                 goto err;
 248             }
 249             s->write_hash = mac_ctx;
 250         } else {
 251             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 252             if (mac_ctx == NULL) {
 253                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 254                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 255                          ERR_R_MALLOC_FAILURE);
 256                 goto err;
 257             }
 258         }
 259 #ifndef OPENSSL_NO_COMP
 260         COMP_CTX_free(s->compress);
 261         s->compress = NULL;
 262         if (comp != NULL) {
 263             s->compress = COMP_CTX_new(comp->method);
 264             if (s->compress == NULL) {
 265                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 266                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 267                         SSL_R_COMPRESSION_LIBRARY_ERROR);
 268                 goto err;
 269             }
 270         }
 271 #endif
 272         /*
 273          * this is done by dtls1_reset_seq_numbers for DTLS
 274          */
 275         if (!SSL_IS_DTLS(s))
 276             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 277         mac_secret = &(s->s3.write_mac_secret[0]);
 278         mac_secret_size = &(s->s3.write_mac_secret_size);
 279     }
 280
 281     if (reuse_dd)
 282         EVP_CIPHER_CTX_reset(dd);
 283
 284     p = s->s3.tmp.key_block;
 285     i = *mac_secret_size = s->s3.tmp.new_mac_secret_size;
 286
 287     /* TODO(size_t): convert me */
 288     cl = EVP_CIPHER_key_length(c);
 289     j = cl;
 290     /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 291     /* If GCM/CCM mode only part of IV comes from PRF */
 292     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 293         k = EVP_GCM_TLS_FIXED_IV_LEN;
 294     else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
 295         k = EVP_CCM_TLS_FIXED_IV_LEN;
 296     else
 297         k = EVP_CIPHER_iv_length(c);
 298     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 299         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
 300         ms = &(p[0]);
 301         n = i + i;
 302         key = &(p[n]);
 303         n += j + j;
 304         iv = &(p[n]);
 305         n += k + k;
 306     } else {
 307         n = i;
 308         ms = &(p[n]);
 309         n += i + j;
 310         key = &(p[n]);
 311         n += j + k;
 312         iv = &(p[n]);
 313         n += k;
 314     }
 315
 316     if (n > s->s3.tmp.key_block_length) {
 317         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 318                  ERR_R_INTERNAL_ERROR);
 319         goto err;
 320     }
 321
 322     memcpy(mac_secret, ms, i);
 323
 324     if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 325         /* TODO(size_t): Convert this function */
 326         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
 327                                                (int)*mac_secret_size);
 328         if (mac_key == NULL
 329             || EVP_DigestSignInit_ex(mac_ctx, NULL,
 330                                      EVP_MD_name(m), s->ctx->propq,
 331                                      mac_key, s->ctx->libctx) <= 0) {
 332             EVP_PKEY_free(mac_key);
 333             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 334                      ERR_R_INTERNAL_ERROR);
 335             goto err;
 336         }
 337         EVP_PKEY_free(mac_key);
 338     }
 339
 340     OSSL_TRACE_BEGIN(TLS) {
 341         BIO_printf(trc_out, "which = %04X, mac key:\n", which);
 342         BIO_dump_indent(trc_out, ms, i, 4);
 343     } OSSL_TRACE_END(TLS);
 344
 345     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
 346         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 347             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
 348                                     iv)) {
 349             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 350                      ERR_R_INTERNAL_ERROR);
 351             goto err;
 352         }
 353     } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
 354         int taglen;
 355         if (s->s3.tmp.
 356             new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
 357             taglen = EVP_CCM8_TLS_TAG_LEN;
 358         else
 359             taglen = EVP_CCM_TLS_TAG_LEN;
 360         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 361             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
 362             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
 363             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
 364             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 365             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 366                      ERR_R_INTERNAL_ERROR);
 367             goto err;
 368         }
 369     } else {
 370         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 371             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 372                      ERR_R_INTERNAL_ERROR);
 373             goto err;
 374         }
 375     }
 376     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 377     if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
 378         && !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 379                                 (int)*mac_secret_size, mac_secret)) {
 380         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 381                  ERR_R_INTERNAL_ERROR);
 382         goto err;
 383     }
 384 #ifndef OPENSSL_NO_KTLS
 385     if (s->compress)
 386         goto skip_ktls;
 387
 388     if (((which & SSL3_CC_READ) && (s->mode & SSL_MODE_NO_KTLS_RX))
 389         || ((which & SSL3_CC_WRITE) && (s->mode & SSL_MODE_NO_KTLS_TX)))
 390         goto skip_ktls;
 391
 392     /* ktls supports only the maximum fragment size */
 393     if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
 394         goto skip_ktls;
 395
 396 # ifdef __FreeBSD__
 397     memset(&crypto_info, 0, sizeof(crypto_info));
 398     switch (s->s3.tmp.new_cipher->algorithm_enc) {
 399     case SSL_AES128GCM:
 400     case SSL_AES256GCM:
 401         crypto_info.cipher_algorithm = CRYPTO_AES_NIST_GCM_16;
 402         crypto_info.iv_len = EVP_GCM_TLS_FIXED_IV_LEN;
 403         break;
 404     case SSL_AES128:
 405     case SSL_AES256:
 406         if (s->ext.use_etm)
 407             goto skip_ktls;
 408         switch (s->s3.tmp.new_cipher->algorithm_mac) {
 409         case SSL_SHA1:
 410             crypto_info.auth_algorithm = CRYPTO_SHA1_HMAC;
 411             break;
 412         case SSL_SHA256:
 413             crypto_info.auth_algorithm = CRYPTO_SHA2_256_HMAC;
 414             break;
 415         case SSL_SHA384:
 416             crypto_info.auth_algorithm = CRYPTO_SHA2_384_HMAC;
 417             break;
 418         default:
 419             goto skip_ktls;
 420         }
 421         crypto_info.cipher_algorithm = CRYPTO_AES_CBC;
 422         crypto_info.iv_len = EVP_CIPHER_iv_length(c);
 423         crypto_info.auth_key = ms;
 424         crypto_info.auth_key_len = *mac_secret_size;
 425         break;
 426     default:
 427         goto skip_ktls;
 428     }
 429     crypto_info.cipher_key = key;
 430     crypto_info.cipher_key_len = EVP_CIPHER_key_length(c);
 431     crypto_info.iv = iv;
 432     crypto_info.tls_vmajor = (s->version >> 8) & 0x000000ff;
 433     crypto_info.tls_vminor = (s->version & 0x000000ff);
 434 # else
 435     /* check that cipher is AES_GCM_128 */
 436     if (EVP_CIPHER_nid(c) != NID_aes_128_gcm
 437         || EVP_CIPHER_mode(c) != EVP_CIPH_GCM_MODE
 438         || EVP_CIPHER_key_length(c) != TLS_CIPHER_AES_GCM_128_KEY_SIZE)
 439         goto skip_ktls;
 440
 441     /* check version is 1.2 */
 442     if (s->version != TLS1_2_VERSION)
 443         goto skip_ktls;
 444 # endif
 445
 446     if (which & SSL3_CC_WRITE)
 447         bio = s->wbio;
 448     else
 449         bio = s->rbio;
 450
 451     if (!ossl_assert(bio != NULL)) {
 452         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 453                  ERR_R_INTERNAL_ERROR);
 454         goto err;
 455     }
 456
 457     /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
 458     if (which & SSL3_CC_WRITE) {
 459        if (BIO_flush(bio) <= 0)
 460            goto skip_ktls;
 461     }
 462
 463     /* ktls doesn't support renegotiation */
 464     if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) ||
 465         (BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) {
 466         SSLfatal(s, SSL_AD_NO_RENEGOTIATION, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 467                  ERR_R_INTERNAL_ERROR);
 468         goto err;
 469     }
 470
 471 # ifndef __FreeBSD__
 472     memset(&crypto_info, 0, sizeof(crypto_info));
 473     crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_128;
 474     crypto_info.info.version = s->version;
 475
 476     EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GET_IV,
 477                         EVP_GCM_TLS_FIXED_IV_LEN + EVP_GCM_TLS_EXPLICIT_IV_LEN,
 478                         geniv);
 479     memcpy(crypto_info.iv, geniv + EVP_GCM_TLS_FIXED_IV_LEN,
 480            TLS_CIPHER_AES_GCM_128_IV_SIZE);
 481     memcpy(crypto_info.salt, geniv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
 482     memcpy(crypto_info.key, key, EVP_CIPHER_key_length(c));
 483     if (which & SSL3_CC_WRITE)
 484         memcpy(crypto_info.rec_seq, &s->rlayer.write_sequence,
 485                 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 486     else
 487         memcpy(crypto_info.rec_seq, &s->rlayer.read_sequence,
 488                 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 489
 490     if (which & SSL3_CC_READ) {
 491         count_unprocessed = count_unprocessed_records(s);
 492         if (count_unprocessed < 0)
 493             goto skip_ktls;
 494
 495         /* increment the crypto_info record sequence */
 496         while (count_unprocessed) {
 497             for (bit = 7; bit >= 0; bit--) { /* increment */
 498                 ++crypto_info.rec_seq[bit];
 499                 if (crypto_info.rec_seq[bit] != 0)
 500                     break;
 501             }
 502             count_unprocessed--;
 503         }
 504     }
 505 # endif
 506
 507     /* ktls works with user provided buffers directly */
 508     if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) {
 509         if (which & SSL3_CC_WRITE)
 510             ssl3_release_write_buffer(s);
 511         SSL_set_options(s, SSL_OP_NO_RENEGOTIATION);
 512     }
 513
 514  skip_ktls:
 515 #endif                          /* OPENSSL_NO_KTLS */
 516     s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
 517
 518     OSSL_TRACE_BEGIN(TLS) {
 519         BIO_printf(trc_out, "which = %04X, key:\n", which);
 520         BIO_dump_indent(trc_out, key, EVP_CIPHER_key_length(c), 4);
 521         BIO_printf(trc_out, "iv:\n");
 522         BIO_dump_indent(trc_out, iv, k, 4);
 523     } OSSL_TRACE_END(TLS);
 524
 525     return 1;
 526  err:
 527     return 0;
 528 }
 529
 530 int tls1_setup_key_block(SSL *s)
 531 {
 532     unsigned char *p;
 533     const EVP_CIPHER *c;
 534     const EVP_MD *hash;
 535     SSL_COMP *comp;
 536     int mac_type = NID_undef;
 537     size_t num, mac_secret_size = 0;
 538     int ret = 0;
 539
 540     if (s->s3.tmp.key_block_length != 0)
 541         return 1;
 542
 543     if (!ssl_cipher_get_evp(s->ctx, s->session, &c, &hash, &mac_type,
 544                             &mac_secret_size, &comp, s->ext.use_etm)) {
 545         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 546                  SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 547         return 0;
 548     }
 549
 550     ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
 551     s->s3.tmp.new_sym_enc = c;
 552     ssl_evp_md_free(s->s3.tmp.new_hash);
 553     s->s3.tmp.new_hash = hash;
 554     s->s3.tmp.new_mac_pkey_type = mac_type;
 555     s->s3.tmp.new_mac_secret_size = mac_secret_size;
 556     num = EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c);
 557     num *= 2;
 558
 559     ssl3_cleanup_key_block(s);
 560
 561     if ((p = OPENSSL_malloc(num)) == NULL) {
 562         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 563                  ERR_R_MALLOC_FAILURE);
 564         goto err;
 565     }
 566
 567     s->s3.tmp.key_block_length = num;
 568     s->s3.tmp.key_block = p;
 569
 570     OSSL_TRACE_BEGIN(TLS) {
 571         BIO_printf(trc_out, "client random\n");
 572         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 573         BIO_printf(trc_out, "server random\n");
 574         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 575         BIO_printf(trc_out, "master key\n");
 576         BIO_dump_indent(trc_out,
 577                         s->session->master_key,
 578                         s->session->master_key_length, 4);
 579     } OSSL_TRACE_END(TLS);
 580
 581     if (!tls1_generate_key_block(s, p, num)) {
 582         /* SSLfatal() already called */
 583         goto err;
 584     }
 585
 586     OSSL_TRACE_BEGIN(TLS) {
 587         BIO_printf(trc_out, "key block\n");
 588         BIO_dump_indent(trc_out, p, num, 4);
 589     } OSSL_TRACE_END(TLS);
 590
 591     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 592         && s->method->version <= TLS1_VERSION) {
 593         /*
 594          * enable vulnerability countermeasure for CBC ciphers with known-IV
 595          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 596          */
 597         s->s3.need_empty_fragments = 1;
 598
 599         if (s->session->cipher != NULL) {
 600             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 601                 s->s3.need_empty_fragments = 0;
 602
 603 #ifndef OPENSSL_NO_RC4
 604             if (s->session->cipher->algorithm_enc == SSL_RC4)
 605                 s->s3.need_empty_fragments = 0;
 606 #endif
 607         }
 608     }
 609
 610     ret = 1;
 611  err:
 612     return ret;
 613 }
 614
 615 size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
 616                              unsigned char *out)
 617 {
 618     size_t hashlen;
 619     unsigned char hash[EVP_MAX_MD_SIZE];
 620
 621     if (!ssl3_digest_cached_records(s, 0)) {
 622         /* SSLfatal() already called */
 623         return 0;
 624     }
 625
 626     if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 627         /* SSLfatal() already called */
 628         return 0;
 629     }
 630
 631     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 632                   s->session->master_key, s->session->master_key_length,
 633                   out, TLS1_FINISH_MAC_LENGTH, 1)) {
 634         /* SSLfatal() already called */
 635         return 0;
 636     }
 637     OPENSSL_cleanse(hash, hashlen);
 638     return TLS1_FINISH_MAC_LENGTH;
 639 }
 640
 641 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 642                                 size_t len, size_t *secret_size)
 643 {
 644     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 645         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 646         size_t hashlen;
 647         /*
 648          * Digest cached records keeping record buffer (if present): this won't
 649          * affect client auth because we're freezing the buffer at the same
 650          * point (after client key exchange and before certificate verify)
 651          */
 652         if (!ssl3_digest_cached_records(s, 1)
 653                 || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 654             /* SSLfatal() already called */
 655             return 0;
 656         }
 657         OSSL_TRACE_BEGIN(TLS) {
 658             BIO_printf(trc_out, "Handshake hashes:\n");
 659             BIO_dump(trc_out, (char *)hash, hashlen);
 660         } OSSL_TRACE_END(TLS);
 661         if (!tls1_PRF(s,
 662                       TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 663                       TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 664                       hash, hashlen,
 665                       NULL, 0,
 666                       NULL, 0,
 667                       NULL, 0, p, len, out,
 668                       SSL3_MASTER_SECRET_SIZE, 1)) {
 669             /* SSLfatal() already called */
 670             return 0;
 671         }
 672         OPENSSL_cleanse(hash, hashlen);
 673     } else {
 674         if (!tls1_PRF(s,
 675                       TLS_MD_MASTER_SECRET_CONST,
 676                       TLS_MD_MASTER_SECRET_CONST_SIZE,
 677                       s->s3.client_random, SSL3_RANDOM_SIZE,
 678                       NULL, 0,
 679                       s->s3.server_random, SSL3_RANDOM_SIZE,
 680                       NULL, 0, p, len, out,
 681                       SSL3_MASTER_SECRET_SIZE, 1)) {
 682            /* SSLfatal() already called */
 683             return 0;
 684         }
 685     }
 686
 687     OSSL_TRACE_BEGIN(TLS) {
 688         BIO_printf(trc_out, "Premaster Secret:\n");
 689         BIO_dump_indent(trc_out, p, len, 4);
 690         BIO_printf(trc_out, "Client Random:\n");
 691         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 692         BIO_printf(trc_out, "Server Random:\n");
 693         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 694         BIO_printf(trc_out, "Master Secret:\n");
 695         BIO_dump_indent(trc_out,
 696                         s->session->master_key,
 697                         SSL3_MASTER_SECRET_SIZE, 4);
 698     } OSSL_TRACE_END(TLS);
 699
 700     *secret_size = SSL3_MASTER_SECRET_SIZE;
 701     return 1;
 702 }
 703
 704 int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 705                                 const char *label, size_t llen,
 706                                 const unsigned char *context,
 707                                 size_t contextlen, int use_context)
 708 {
 709     unsigned char *val = NULL;
 710     size_t vallen = 0, currentvalpos;
 711     int rv;
 712
 713     /*
 714      * construct PRF arguments we construct the PRF argument ourself rather
 715      * than passing separate values into the TLS PRF to ensure that the
 716      * concatenation of values does not create a prohibited label.
 717      */
 718     vallen = llen + SSL3_RANDOM_SIZE * 2;
 719     if (use_context) {
 720         vallen += 2 + contextlen;
 721     }
 722
 723     val = OPENSSL_malloc(vallen);
 724     if (val == NULL)
 725         goto err2;
 726     currentvalpos = 0;
 727     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 728     currentvalpos += llen;
 729     memcpy(val + currentvalpos, s->s3.client_random, SSL3_RANDOM_SIZE);
 730     currentvalpos += SSL3_RANDOM_SIZE;
 731     memcpy(val + currentvalpos, s->s3.server_random, SSL3_RANDOM_SIZE);
 732     currentvalpos += SSL3_RANDOM_SIZE;
 733
 734     if (use_context) {
 735         val[currentvalpos] = (contextlen >> 8) & 0xff;
 736         currentvalpos++;
 737         val[currentvalpos] = contextlen & 0xff;
 738         currentvalpos++;
 739         if ((contextlen > 0) || (context != NULL)) {
 740             memcpy(val + currentvalpos, context, contextlen);
 741         }
 742     }
 743
 744     /*
 745      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 746      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 747      * the comparisons won't have buffer overflow
 748      */
 749     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 750                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 751         goto err1;
 752     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 753                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 754         goto err1;
 755     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 756                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 757         goto err1;
 758     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 759                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 760         goto err1;
 761     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 762                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 763         goto err1;
 764
 765     rv = tls1_PRF(s,
 766                   val, vallen,
 767                   NULL, 0,
 768                   NULL, 0,
 769                   NULL, 0,
 770                   NULL, 0,
 771                   s->session->master_key, s->session->master_key_length,
 772                   out, olen, 0);
 773
 774     goto ret;
 775  err1:
 776     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 777     rv = 0;
 778     goto ret;
 779  err2:
 780     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
 781     rv = 0;
 782  ret:
 783     OPENSSL_clear_free(val, vallen);
 784     return rv;
 785 }
 786
 787 int tls1_alert_code(int code)
 788 {
 789     switch (code) {
 790     case SSL_AD_CLOSE_NOTIFY:
 791         return SSL3_AD_CLOSE_NOTIFY;
 792     case SSL_AD_UNEXPECTED_MESSAGE:
 793         return SSL3_AD_UNEXPECTED_MESSAGE;
 794     case SSL_AD_BAD_RECORD_MAC:
 795         return SSL3_AD_BAD_RECORD_MAC;
 796     case SSL_AD_DECRYPTION_FAILED:
 797         return TLS1_AD_DECRYPTION_FAILED;
 798     case SSL_AD_RECORD_OVERFLOW:
 799         return TLS1_AD_RECORD_OVERFLOW;
 800     case SSL_AD_DECOMPRESSION_FAILURE:
 801         return SSL3_AD_DECOMPRESSION_FAILURE;
 802     case SSL_AD_HANDSHAKE_FAILURE:
 803         return SSL3_AD_HANDSHAKE_FAILURE;
 804     case SSL_AD_NO_CERTIFICATE:
 805         return -1;
 806     case SSL_AD_BAD_CERTIFICATE:
 807         return SSL3_AD_BAD_CERTIFICATE;
 808     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 809         return SSL3_AD_UNSUPPORTED_CERTIFICATE;
 810     case SSL_AD_CERTIFICATE_REVOKED:
 811         return SSL3_AD_CERTIFICATE_REVOKED;
 812     case SSL_AD_CERTIFICATE_EXPIRED:
 813         return SSL3_AD_CERTIFICATE_EXPIRED;
 814     case SSL_AD_CERTIFICATE_UNKNOWN:
 815         return SSL3_AD_CERTIFICATE_UNKNOWN;
 816     case SSL_AD_ILLEGAL_PARAMETER:
 817         return SSL3_AD_ILLEGAL_PARAMETER;
 818     case SSL_AD_UNKNOWN_CA:
 819         return TLS1_AD_UNKNOWN_CA;
 820     case SSL_AD_ACCESS_DENIED:
 821         return TLS1_AD_ACCESS_DENIED;
 822     case SSL_AD_DECODE_ERROR:
 823         return TLS1_AD_DECODE_ERROR;
 824     case SSL_AD_DECRYPT_ERROR:
 825         return TLS1_AD_DECRYPT_ERROR;
 826     case SSL_AD_EXPORT_RESTRICTION:
 827         return TLS1_AD_EXPORT_RESTRICTION;
 828     case SSL_AD_PROTOCOL_VERSION:
 829         return TLS1_AD_PROTOCOL_VERSION;
 830     case SSL_AD_INSUFFICIENT_SECURITY:
 831         return TLS1_AD_INSUFFICIENT_SECURITY;
 832     case SSL_AD_INTERNAL_ERROR:
 833         return TLS1_AD_INTERNAL_ERROR;
 834     case SSL_AD_USER_CANCELLED:
 835         return TLS1_AD_USER_CANCELLED;
 836     case SSL_AD_NO_RENEGOTIATION:
 837         return TLS1_AD_NO_RENEGOTIATION;
 838     case SSL_AD_UNSUPPORTED_EXTENSION:
 839         return TLS1_AD_UNSUPPORTED_EXTENSION;
 840     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 841         return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
 842     case SSL_AD_UNRECOGNIZED_NAME:
 843         return TLS1_AD_UNRECOGNIZED_NAME;
 844     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 845         return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
 846     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 847         return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
 848     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 849         return TLS1_AD_UNKNOWN_PSK_IDENTITY;
 850     case SSL_AD_INAPPROPRIATE_FALLBACK:
 851         return TLS1_AD_INAPPROPRIATE_FALLBACK;
 852     case SSL_AD_NO_APPLICATION_PROTOCOL:
 853         return TLS1_AD_NO_APPLICATION_PROTOCOL;
 854     case SSL_AD_CERTIFICATE_REQUIRED:
 855         return SSL_AD_HANDSHAKE_FAILURE;
 856     default:
 857         return -1;
 858     }
 859 }