ssl/t1_enc.c

   1 /*
   2  * Copyright 1995-2020 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->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
 184             s->mac_flags |= SSL_MAC_FLAG_READ_MAC_TLSTREE;
 185         else
 186             s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_TLSTREE;
 187
 188         if (s->enc_read_ctx != NULL) {
 189             reuse_dd = 1;
 190         } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 191             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 192                      ERR_R_MALLOC_FAILURE);
 193             goto err;
 194         } else {
 195             /*
 196              * make sure it's initialised in case we exit later with an error
 197              */
 198             EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 199         }
 200         dd = s->enc_read_ctx;
 201         mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 202         if (mac_ctx == NULL) {
 203             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 204                      ERR_R_INTERNAL_ERROR);
 205             goto err;
 206         }
 207 #ifndef OPENSSL_NO_COMP
 208         COMP_CTX_free(s->expand);
 209         s->expand = NULL;
 210         if (comp != NULL) {
 211             s->expand = COMP_CTX_new(comp->method);
 212             if (s->expand == NULL) {
 213                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 214                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 215                          SSL_R_COMPRESSION_LIBRARY_ERROR);
 216                 goto err;
 217             }
 218         }
 219 #endif
 220         /*
 221          * this is done by dtls1_reset_seq_numbers for DTLS
 222          */
 223         if (!SSL_IS_DTLS(s))
 224             RECORD_LAYER_reset_read_sequence(&s->rlayer);
 225         mac_secret = &(s->s3.read_mac_secret[0]);
 226         mac_secret_size = &(s->s3.read_mac_secret_size);
 227     } else {
 228         s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
 229         if (s->ext.use_etm)
 230             s->s3.flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 231         else
 232             s->s3.flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 233
 234         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 235             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 236         else
 237             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 238
 239         if (s->s3.tmp.new_cipher->algorithm2 & TLS1_TLSTREE)
 240             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
 241         else
 242             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_TLSTREE;
 243         if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
 244             reuse_dd = 1;
 245         } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 246             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 247                      ERR_R_MALLOC_FAILURE);
 248             goto err;
 249         }
 250         dd = s->enc_write_ctx;
 251         if (SSL_IS_DTLS(s)) {
 252             mac_ctx = EVP_MD_CTX_new();
 253             if (mac_ctx == NULL) {
 254                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 255                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 256                          ERR_R_MALLOC_FAILURE);
 257                 goto err;
 258             }
 259             s->write_hash = mac_ctx;
 260         } else {
 261             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 262             if (mac_ctx == NULL) {
 263                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 264                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 265                          ERR_R_MALLOC_FAILURE);
 266                 goto err;
 267             }
 268         }
 269 #ifndef OPENSSL_NO_COMP
 270         COMP_CTX_free(s->compress);
 271         s->compress = NULL;
 272         if (comp != NULL) {
 273             s->compress = COMP_CTX_new(comp->method);
 274             if (s->compress == NULL) {
 275                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 276                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 277                         SSL_R_COMPRESSION_LIBRARY_ERROR);
 278                 goto err;
 279             }
 280         }
 281 #endif
 282         /*
 283          * this is done by dtls1_reset_seq_numbers for DTLS
 284          */
 285         if (!SSL_IS_DTLS(s))
 286             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 287         mac_secret = &(s->s3.write_mac_secret[0]);
 288         mac_secret_size = &(s->s3.write_mac_secret_size);
 289     }
 290
 291     if (reuse_dd)
 292         EVP_CIPHER_CTX_reset(dd);
 293
 294     p = s->s3.tmp.key_block;
 295     i = *mac_secret_size = s->s3.tmp.new_mac_secret_size;
 296
 297     /* TODO(size_t): convert me */
 298     cl = EVP_CIPHER_key_length(c);
 299     j = cl;
 300     /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 301     /* If GCM/CCM mode only part of IV comes from PRF */
 302     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 303         k = EVP_GCM_TLS_FIXED_IV_LEN;
 304     else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
 305         k = EVP_CCM_TLS_FIXED_IV_LEN;
 306     else
 307         k = EVP_CIPHER_iv_length(c);
 308     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 309         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
 310         ms = &(p[0]);
 311         n = i + i;
 312         key = &(p[n]);
 313         n += j + j;
 314         iv = &(p[n]);
 315         n += k + k;
 316     } else {
 317         n = i;
 318         ms = &(p[n]);
 319         n += i + j;
 320         key = &(p[n]);
 321         n += j + k;
 322         iv = &(p[n]);
 323         n += k;
 324     }
 325
 326     if (n > s->s3.tmp.key_block_length) {
 327         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 328                  ERR_R_INTERNAL_ERROR);
 329         goto err;
 330     }
 331
 332     memcpy(mac_secret, ms, i);
 333
 334     if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 335         /* TODO(size_t): Convert this function */
 336         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
 337                                                (int)*mac_secret_size);
 338         if (mac_key == NULL
 339             || EVP_DigestSignInit_ex(mac_ctx, NULL,
 340                                      EVP_MD_name(m), s->ctx->propq,
 341                                      mac_key, s->ctx->libctx) <= 0) {
 342             EVP_PKEY_free(mac_key);
 343             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 344                      ERR_R_INTERNAL_ERROR);
 345             goto err;
 346         }
 347         EVP_PKEY_free(mac_key);
 348     }
 349
 350     OSSL_TRACE_BEGIN(TLS) {
 351         BIO_printf(trc_out, "which = %04X, mac key:\n", which);
 352         BIO_dump_indent(trc_out, ms, i, 4);
 353     } OSSL_TRACE_END(TLS);
 354
 355     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
 356         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 357             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
 358                                     iv)) {
 359             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 360                      ERR_R_INTERNAL_ERROR);
 361             goto err;
 362         }
 363     } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
 364         int taglen;
 365         if (s->s3.tmp.
 366             new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
 367             taglen = EVP_CCM8_TLS_TAG_LEN;
 368         else
 369             taglen = EVP_CCM_TLS_TAG_LEN;
 370         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 371             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
 372             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
 373             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
 374             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 375             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 376                      ERR_R_INTERNAL_ERROR);
 377             goto err;
 378         }
 379     } else {
 380         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 381             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 382                      ERR_R_INTERNAL_ERROR);
 383             goto err;
 384         }
 385     }
 386     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 387     if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
 388         && !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 389                                 (int)*mac_secret_size, mac_secret)) {
 390         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 391                  ERR_R_INTERNAL_ERROR);
 392         goto err;
 393     }
 394 #ifndef OPENSSL_NO_KTLS
 395     if (s->compress)
 396         goto skip_ktls;
 397
 398     if (((which & SSL3_CC_READ) && (s->mode & SSL_MODE_NO_KTLS_RX))
 399         || ((which & SSL3_CC_WRITE) && (s->mode & SSL_MODE_NO_KTLS_TX)))
 400         goto skip_ktls;
 401
 402     /* ktls supports only the maximum fragment size */
 403     if (ssl_get_max_send_fragment(s) != SSL3_RT_MAX_PLAIN_LENGTH)
 404         goto skip_ktls;
 405
 406 # ifdef __FreeBSD__
 407     memset(&crypto_info, 0, sizeof(crypto_info));
 408     switch (s->s3.tmp.new_cipher->algorithm_enc) {
 409     case SSL_AES128GCM:
 410     case SSL_AES256GCM:
 411         crypto_info.cipher_algorithm = CRYPTO_AES_NIST_GCM_16;
 412         crypto_info.iv_len = EVP_GCM_TLS_FIXED_IV_LEN;
 413         break;
 414     case SSL_AES128:
 415     case SSL_AES256:
 416         if (s->ext.use_etm)
 417             goto skip_ktls;
 418         switch (s->s3.tmp.new_cipher->algorithm_mac) {
 419         case SSL_SHA1:
 420             crypto_info.auth_algorithm = CRYPTO_SHA1_HMAC;
 421             break;
 422         case SSL_SHA256:
 423             crypto_info.auth_algorithm = CRYPTO_SHA2_256_HMAC;
 424             break;
 425         case SSL_SHA384:
 426             crypto_info.auth_algorithm = CRYPTO_SHA2_384_HMAC;
 427             break;
 428         default:
 429             goto skip_ktls;
 430         }
 431         crypto_info.cipher_algorithm = CRYPTO_AES_CBC;
 432         crypto_info.iv_len = EVP_CIPHER_iv_length(c);
 433         crypto_info.auth_key = ms;
 434         crypto_info.auth_key_len = *mac_secret_size;
 435         break;
 436     default:
 437         goto skip_ktls;
 438     }
 439     crypto_info.cipher_key = key;
 440     crypto_info.cipher_key_len = EVP_CIPHER_key_length(c);
 441     crypto_info.iv = iv;
 442     crypto_info.tls_vmajor = (s->version >> 8) & 0x000000ff;
 443     crypto_info.tls_vminor = (s->version & 0x000000ff);
 444 # else
 445     /* check that cipher is AES_GCM_128 */
 446     if (EVP_CIPHER_nid(c) != NID_aes_128_gcm
 447         || EVP_CIPHER_mode(c) != EVP_CIPH_GCM_MODE
 448         || EVP_CIPHER_key_length(c) != TLS_CIPHER_AES_GCM_128_KEY_SIZE)
 449         goto skip_ktls;
 450
 451     /* check version is 1.2 */
 452     if (s->version != TLS1_2_VERSION)
 453         goto skip_ktls;
 454 # endif
 455
 456     if (which & SSL3_CC_WRITE)
 457         bio = s->wbio;
 458     else
 459         bio = s->rbio;
 460
 461     if (!ossl_assert(bio != NULL)) {
 462         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 463                  ERR_R_INTERNAL_ERROR);
 464         goto err;
 465     }
 466
 467     /* All future data will get encrypted by ktls. Flush the BIO or skip ktls */
 468     if (which & SSL3_CC_WRITE) {
 469        if (BIO_flush(bio) <= 0)
 470            goto skip_ktls;
 471     }
 472
 473     /* ktls doesn't support renegotiation */
 474     if ((BIO_get_ktls_send(s->wbio) && (which & SSL3_CC_WRITE)) ||
 475         (BIO_get_ktls_recv(s->rbio) && (which & SSL3_CC_READ))) {
 476         SSLfatal(s, SSL_AD_NO_RENEGOTIATION, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 477                  ERR_R_INTERNAL_ERROR);
 478         goto err;
 479     }
 480
 481 # ifndef __FreeBSD__
 482     memset(&crypto_info, 0, sizeof(crypto_info));
 483     crypto_info.info.cipher_type = TLS_CIPHER_AES_GCM_128;
 484     crypto_info.info.version = s->version;
 485
 486     EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GET_IV,
 487                         EVP_GCM_TLS_FIXED_IV_LEN + EVP_GCM_TLS_EXPLICIT_IV_LEN,
 488                         geniv);
 489     memcpy(crypto_info.iv, geniv + EVP_GCM_TLS_FIXED_IV_LEN,
 490            TLS_CIPHER_AES_GCM_128_IV_SIZE);
 491     memcpy(crypto_info.salt, geniv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
 492     memcpy(crypto_info.key, key, EVP_CIPHER_key_length(c));
 493     if (which & SSL3_CC_WRITE)
 494         memcpy(crypto_info.rec_seq, &s->rlayer.write_sequence,
 495                 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 496     else
 497         memcpy(crypto_info.rec_seq, &s->rlayer.read_sequence,
 498                 TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE);
 499
 500     if (which & SSL3_CC_READ) {
 501         count_unprocessed = count_unprocessed_records(s);
 502         if (count_unprocessed < 0)
 503             goto skip_ktls;
 504
 505         /* increment the crypto_info record sequence */
 506         while (count_unprocessed) {
 507             for (bit = 7; bit >= 0; bit--) { /* increment */
 508                 ++crypto_info.rec_seq[bit];
 509                 if (crypto_info.rec_seq[bit] != 0)
 510                     break;
 511             }
 512             count_unprocessed--;
 513         }
 514     }
 515 # endif
 516
 517     /* ktls works with user provided buffers directly */
 518     if (BIO_set_ktls(bio, &crypto_info, which & SSL3_CC_WRITE)) {
 519         if (which & SSL3_CC_WRITE)
 520             ssl3_release_write_buffer(s);
 521         SSL_set_options(s, SSL_OP_NO_RENEGOTIATION);
 522     }
 523
 524  skip_ktls:
 525 #endif                          /* OPENSSL_NO_KTLS */
 526     s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
 527
 528     OSSL_TRACE_BEGIN(TLS) {
 529         BIO_printf(trc_out, "which = %04X, key:\n", which);
 530         BIO_dump_indent(trc_out, key, EVP_CIPHER_key_length(c), 4);
 531         BIO_printf(trc_out, "iv:\n");
 532         BIO_dump_indent(trc_out, iv, k, 4);
 533     } OSSL_TRACE_END(TLS);
 534
 535     return 1;
 536  err:
 537     return 0;
 538 }
 539
 540 int tls1_setup_key_block(SSL *s)
 541 {
 542     unsigned char *p;
 543     const EVP_CIPHER *c;
 544     const EVP_MD *hash;
 545     SSL_COMP *comp;
 546     int mac_type = NID_undef;
 547     size_t num, mac_secret_size = 0;
 548     int ret = 0;
 549
 550     if (s->s3.tmp.key_block_length != 0)
 551         return 1;
 552
 553     if (!ssl_cipher_get_evp(s->ctx, s->session, &c, &hash, &mac_type,
 554                             &mac_secret_size, &comp, s->ext.use_etm)) {
 555         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 556                  SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 557         return 0;
 558     }
 559
 560     ssl_evp_cipher_free(s->s3.tmp.new_sym_enc);
 561     s->s3.tmp.new_sym_enc = c;
 562     ssl_evp_md_free(s->s3.tmp.new_hash);
 563     s->s3.tmp.new_hash = hash;
 564     s->s3.tmp.new_mac_pkey_type = mac_type;
 565     s->s3.tmp.new_mac_secret_size = mac_secret_size;
 566     num = EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c);
 567     num *= 2;
 568
 569     ssl3_cleanup_key_block(s);
 570
 571     if ((p = OPENSSL_malloc(num)) == NULL) {
 572         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 573                  ERR_R_MALLOC_FAILURE);
 574         goto err;
 575     }
 576
 577     s->s3.tmp.key_block_length = num;
 578     s->s3.tmp.key_block = p;
 579
 580     OSSL_TRACE_BEGIN(TLS) {
 581         BIO_printf(trc_out, "client random\n");
 582         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 583         BIO_printf(trc_out, "server random\n");
 584         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 585         BIO_printf(trc_out, "master key\n");
 586         BIO_dump_indent(trc_out,
 587                         s->session->master_key,
 588                         s->session->master_key_length, 4);
 589     } OSSL_TRACE_END(TLS);
 590
 591     if (!tls1_generate_key_block(s, p, num)) {
 592         /* SSLfatal() already called */
 593         goto err;
 594     }
 595
 596     OSSL_TRACE_BEGIN(TLS) {
 597         BIO_printf(trc_out, "key block\n");
 598         BIO_dump_indent(trc_out, p, num, 4);
 599     } OSSL_TRACE_END(TLS);
 600
 601     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 602         && s->method->version <= TLS1_VERSION) {
 603         /*
 604          * enable vulnerability countermeasure for CBC ciphers with known-IV
 605          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 606          */
 607         s->s3.need_empty_fragments = 1;
 608
 609         if (s->session->cipher != NULL) {
 610             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 611                 s->s3.need_empty_fragments = 0;
 612
 613 #ifndef OPENSSL_NO_RC4
 614             if (s->session->cipher->algorithm_enc == SSL_RC4)
 615                 s->s3.need_empty_fragments = 0;
 616 #endif
 617         }
 618     }
 619
 620     ret = 1;
 621  err:
 622     return ret;
 623 }
 624
 625 size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
 626                              unsigned char *out)
 627 {
 628     size_t hashlen;
 629     unsigned char hash[EVP_MAX_MD_SIZE];
 630     size_t finished_size = TLS1_FINISH_MAC_LENGTH;
 631
 632     if (s->s3.tmp.new_cipher->algorithm_mkey & SSL_kGOST18)
 633         finished_size = 32;
 634
 635     if (!ssl3_digest_cached_records(s, 0)) {
 636         /* SSLfatal() already called */
 637         return 0;
 638     }
 639
 640     if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 641         /* SSLfatal() already called */
 642         return 0;
 643     }
 644
 645     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 646                   s->session->master_key, s->session->master_key_length,
 647                   out, finished_size, 1)) {
 648         /* SSLfatal() already called */
 649         return 0;
 650     }
 651     OPENSSL_cleanse(hash, hashlen);
 652     return finished_size;
 653 }
 654
 655 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 656                                 size_t len, size_t *secret_size)
 657 {
 658     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 659         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 660         size_t hashlen;
 661         /*
 662          * Digest cached records keeping record buffer (if present): this won't
 663          * affect client auth because we're freezing the buffer at the same
 664          * point (after client key exchange and before certificate verify)
 665          */
 666         if (!ssl3_digest_cached_records(s, 1)
 667                 || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 668             /* SSLfatal() already called */
 669             return 0;
 670         }
 671         OSSL_TRACE_BEGIN(TLS) {
 672             BIO_printf(trc_out, "Handshake hashes:\n");
 673             BIO_dump(trc_out, (char *)hash, hashlen);
 674         } OSSL_TRACE_END(TLS);
 675         if (!tls1_PRF(s,
 676                       TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 677                       TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 678                       hash, hashlen,
 679                       NULL, 0,
 680                       NULL, 0,
 681                       NULL, 0, p, len, out,
 682                       SSL3_MASTER_SECRET_SIZE, 1)) {
 683             /* SSLfatal() already called */
 684             return 0;
 685         }
 686         OPENSSL_cleanse(hash, hashlen);
 687     } else {
 688         if (!tls1_PRF(s,
 689                       TLS_MD_MASTER_SECRET_CONST,
 690                       TLS_MD_MASTER_SECRET_CONST_SIZE,
 691                       s->s3.client_random, SSL3_RANDOM_SIZE,
 692                       NULL, 0,
 693                       s->s3.server_random, SSL3_RANDOM_SIZE,
 694                       NULL, 0, p, len, out,
 695                       SSL3_MASTER_SECRET_SIZE, 1)) {
 696            /* SSLfatal() already called */
 697             return 0;
 698         }
 699     }
 700
 701     OSSL_TRACE_BEGIN(TLS) {
 702         BIO_printf(trc_out, "Premaster Secret:\n");
 703         BIO_dump_indent(trc_out, p, len, 4);
 704         BIO_printf(trc_out, "Client Random:\n");
 705         BIO_dump_indent(trc_out, s->s3.client_random, SSL3_RANDOM_SIZE, 4);
 706         BIO_printf(trc_out, "Server Random:\n");
 707         BIO_dump_indent(trc_out, s->s3.server_random, SSL3_RANDOM_SIZE, 4);
 708         BIO_printf(trc_out, "Master Secret:\n");
 709         BIO_dump_indent(trc_out,
 710                         s->session->master_key,
 711                         SSL3_MASTER_SECRET_SIZE, 4);
 712     } OSSL_TRACE_END(TLS);
 713
 714     *secret_size = SSL3_MASTER_SECRET_SIZE;
 715     return 1;
 716 }
 717
 718 int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 719                                 const char *label, size_t llen,
 720                                 const unsigned char *context,
 721                                 size_t contextlen, int use_context)
 722 {
 723     unsigned char *val = NULL;
 724     size_t vallen = 0, currentvalpos;
 725     int rv;
 726
 727     /*
 728      * construct PRF arguments we construct the PRF argument ourself rather
 729      * than passing separate values into the TLS PRF to ensure that the
 730      * concatenation of values does not create a prohibited label.
 731      */
 732     vallen = llen + SSL3_RANDOM_SIZE * 2;
 733     if (use_context) {
 734         vallen += 2 + contextlen;
 735     }
 736
 737     val = OPENSSL_malloc(vallen);
 738     if (val == NULL)
 739         goto err2;
 740     currentvalpos = 0;
 741     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 742     currentvalpos += llen;
 743     memcpy(val + currentvalpos, s->s3.client_random, SSL3_RANDOM_SIZE);
 744     currentvalpos += SSL3_RANDOM_SIZE;
 745     memcpy(val + currentvalpos, s->s3.server_random, SSL3_RANDOM_SIZE);
 746     currentvalpos += SSL3_RANDOM_SIZE;
 747
 748     if (use_context) {
 749         val[currentvalpos] = (contextlen >> 8) & 0xff;
 750         currentvalpos++;
 751         val[currentvalpos] = contextlen & 0xff;
 752         currentvalpos++;
 753         if ((contextlen > 0) || (context != NULL)) {
 754             memcpy(val + currentvalpos, context, contextlen);
 755         }
 756     }
 757
 758     /*
 759      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 760      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 761      * the comparisons won't have buffer overflow
 762      */
 763     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 764                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 765         goto err1;
 766     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 767                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 768         goto err1;
 769     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 770                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 771         goto err1;
 772     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 773                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 774         goto err1;
 775     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 776                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 777         goto err1;
 778
 779     rv = tls1_PRF(s,
 780                   val, vallen,
 781                   NULL, 0,
 782                   NULL, 0,
 783                   NULL, 0,
 784                   NULL, 0,
 785                   s->session->master_key, s->session->master_key_length,
 786                   out, olen, 0);
 787
 788     goto ret;
 789  err1:
 790     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 791     rv = 0;
 792     goto ret;
 793  err2:
 794     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
 795     rv = 0;
 796  ret:
 797     OPENSSL_clear_free(val, vallen);
 798     return rv;
 799 }
 800
 801 int tls1_alert_code(int code)
 802 {
 803     switch (code) {
 804     case SSL_AD_CLOSE_NOTIFY:
 805         return SSL3_AD_CLOSE_NOTIFY;
 806     case SSL_AD_UNEXPECTED_MESSAGE:
 807         return SSL3_AD_UNEXPECTED_MESSAGE;
 808     case SSL_AD_BAD_RECORD_MAC:
 809         return SSL3_AD_BAD_RECORD_MAC;
 810     case SSL_AD_DECRYPTION_FAILED:
 811         return TLS1_AD_DECRYPTION_FAILED;
 812     case SSL_AD_RECORD_OVERFLOW:
 813         return TLS1_AD_RECORD_OVERFLOW;
 814     case SSL_AD_DECOMPRESSION_FAILURE:
 815         return SSL3_AD_DECOMPRESSION_FAILURE;
 816     case SSL_AD_HANDSHAKE_FAILURE:
 817         return SSL3_AD_HANDSHAKE_FAILURE;
 818     case SSL_AD_NO_CERTIFICATE:
 819         return -1;
 820     case SSL_AD_BAD_CERTIFICATE:
 821         return SSL3_AD_BAD_CERTIFICATE;
 822     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 823         return SSL3_AD_UNSUPPORTED_CERTIFICATE;
 824     case SSL_AD_CERTIFICATE_REVOKED:
 825         return SSL3_AD_CERTIFICATE_REVOKED;
 826     case SSL_AD_CERTIFICATE_EXPIRED:
 827         return SSL3_AD_CERTIFICATE_EXPIRED;
 828     case SSL_AD_CERTIFICATE_UNKNOWN:
 829         return SSL3_AD_CERTIFICATE_UNKNOWN;
 830     case SSL_AD_ILLEGAL_PARAMETER:
 831         return SSL3_AD_ILLEGAL_PARAMETER;
 832     case SSL_AD_UNKNOWN_CA:
 833         return TLS1_AD_UNKNOWN_CA;
 834     case SSL_AD_ACCESS_DENIED:
 835         return TLS1_AD_ACCESS_DENIED;
 836     case SSL_AD_DECODE_ERROR:
 837         return TLS1_AD_DECODE_ERROR;
 838     case SSL_AD_DECRYPT_ERROR:
 839         return TLS1_AD_DECRYPT_ERROR;
 840     case SSL_AD_EXPORT_RESTRICTION:
 841         return TLS1_AD_EXPORT_RESTRICTION;
 842     case SSL_AD_PROTOCOL_VERSION:
 843         return TLS1_AD_PROTOCOL_VERSION;
 844     case SSL_AD_INSUFFICIENT_SECURITY:
 845         return TLS1_AD_INSUFFICIENT_SECURITY;
 846     case SSL_AD_INTERNAL_ERROR:
 847         return TLS1_AD_INTERNAL_ERROR;
 848     case SSL_AD_USER_CANCELLED:
 849         return TLS1_AD_USER_CANCELLED;
 850     case SSL_AD_NO_RENEGOTIATION:
 851         return TLS1_AD_NO_RENEGOTIATION;
 852     case SSL_AD_UNSUPPORTED_EXTENSION:
 853         return TLS1_AD_UNSUPPORTED_EXTENSION;
 854     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 855         return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
 856     case SSL_AD_UNRECOGNIZED_NAME:
 857         return TLS1_AD_UNRECOGNIZED_NAME;
 858     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 859         return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
 860     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 861         return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
 862     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 863         return TLS1_AD_UNKNOWN_PSK_IDENTITY;
 864     case SSL_AD_INAPPROPRIATE_FALLBACK:
 865         return TLS1_AD_INAPPROPRIATE_FALLBACK;
 866     case SSL_AD_NO_APPLICATION_PROTOCOL:
 867         return TLS1_AD_NO_APPLICATION_PROTOCOL;
 868     case SSL_AD_CERTIFICATE_REQUIRED:
 869         return SSL_AD_HANDSHAKE_FAILURE;
 870     default:
 871         return -1;
 872     }
 873 }