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 OpenSSL license (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_locl.h"
  13 #include <openssl/comp.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/kdf.h>
  16 #include <openssl/rand.h>
  17
  18 /* seed1 through seed5 are concatenated */
  19 static int tls1_PRF(SSL *s,
  20                     const void *seed1, size_t seed1_len,
  21                     const void *seed2, size_t seed2_len,
  22                     const void *seed3, size_t seed3_len,
  23                     const void *seed4, size_t seed4_len,
  24                     const void *seed5, size_t seed5_len,
  25                     const unsigned char *sec, size_t slen,
  26                     unsigned char *out, size_t olen, int fatal)
  27 {
  28     const EVP_MD *md = ssl_prf_md(s);
  29     EVP_PKEY_CTX *pctx = NULL;
  30     int ret = 0;
  31
  32     if (md == NULL) {
  33         /* Should never happen */
  34         if (fatal)
  35             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
  36                      ERR_R_INTERNAL_ERROR);
  37         else
  38             SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  39         return 0;
  40     }
  41     pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_TLS1_PRF, NULL);
  42     if (pctx == NULL || EVP_PKEY_derive_init(pctx) <= 0
  43         || EVP_PKEY_CTX_set_tls1_prf_md(pctx, md) <= 0
  44         || EVP_PKEY_CTX_set1_tls1_prf_secret(pctx, sec, (int)slen) <= 0
  45         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed1, (int)seed1_len) <= 0
  46         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed2, (int)seed2_len) <= 0
  47         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed3, (int)seed3_len) <= 0
  48         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed4, (int)seed4_len) <= 0
  49         || EVP_PKEY_CTX_add1_tls1_prf_seed(pctx, seed5, (int)seed5_len) <= 0
  50         || EVP_PKEY_derive(pctx, out, &olen) <= 0) {
  51         if (fatal)
  52             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_PRF,
  53                      ERR_R_INTERNAL_ERROR);
  54         else
  55             SSLerr(SSL_F_TLS1_PRF, ERR_R_INTERNAL_ERROR);
  56         goto err;
  57     }
  58
  59     ret = 1;
  60
  61  err:
  62     EVP_PKEY_CTX_free(pctx);
  63     return ret;
  64 }
  65
  66 static int tls1_generate_key_block(SSL *s, unsigned char *km, size_t num)
  67 {
  68     int ret;
  69
  70     /* Calls SSLfatal() as required */
  71     ret = tls1_PRF(s,
  72                    TLS_MD_KEY_EXPANSION_CONST,
  73                    TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3->server_random,
  74                    SSL3_RANDOM_SIZE, s->s3->client_random, SSL3_RANDOM_SIZE,
  75                    NULL, 0, NULL, 0, s->session->master_key,
  76                    s->session->master_key_length, km, num, 1);
  77
  78     return ret;
  79 }
  80
  81 int tls1_change_cipher_state(SSL *s, int which)
  82 {
  83     unsigned char *p, *mac_secret;
  84     unsigned char tmp1[EVP_MAX_KEY_LENGTH];
  85     unsigned char tmp2[EVP_MAX_KEY_LENGTH];
  86     unsigned char iv1[EVP_MAX_IV_LENGTH * 2];
  87     unsigned char iv2[EVP_MAX_IV_LENGTH * 2];
  88     unsigned char *ms, *key, *iv;
  89     EVP_CIPHER_CTX *dd;
  90     const EVP_CIPHER *c;
  91 #ifndef OPENSSL_NO_COMP
  92     const SSL_COMP *comp;
  93 #endif
  94     const EVP_MD *m;
  95     int mac_type;
  96     size_t *mac_secret_size;
  97     EVP_MD_CTX *mac_ctx;
  98     EVP_PKEY *mac_key;
  99     size_t n, i, j, k, cl;
 100     int reuse_dd = 0;
 101
 102     c = s->s3->tmp.new_sym_enc;
 103     m = s->s3->tmp.new_hash;
 104     mac_type = s->s3->tmp.new_mac_pkey_type;
 105 #ifndef OPENSSL_NO_COMP
 106     comp = s->s3->tmp.new_compression;
 107 #endif
 108
 109     if (which & SSL3_CC_READ) {
 110         if (s->ext.use_etm)
 111             s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 112         else
 113             s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_READ;
 114
 115         if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 116             s->mac_flags |= SSL_MAC_FLAG_READ_MAC_STREAM;
 117         else
 118             s->mac_flags &= ~SSL_MAC_FLAG_READ_MAC_STREAM;
 119
 120         if (s->enc_read_ctx != NULL) {
 121             reuse_dd = 1;
 122         } else if ((s->enc_read_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 123             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 124                      ERR_R_MALLOC_FAILURE);
 125             goto err;
 126         } else {
 127             /*
 128              * make sure it's initialised in case we exit later with an error
 129              */
 130             EVP_CIPHER_CTX_reset(s->enc_read_ctx);
 131         }
 132         dd = s->enc_read_ctx;
 133         mac_ctx = ssl_replace_hash(&s->read_hash, NULL);
 134         if (mac_ctx == NULL)
 135             goto err;
 136 #ifndef OPENSSL_NO_COMP
 137         COMP_CTX_free(s->expand);
 138         s->expand = NULL;
 139         if (comp != NULL) {
 140             s->expand = COMP_CTX_new(comp->method);
 141             if (s->expand == NULL) {
 142                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 143                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 144                          SSL_R_COMPRESSION_LIBRARY_ERROR);
 145                 goto err;
 146             }
 147         }
 148 #endif
 149         /*
 150          * this is done by dtls1_reset_seq_numbers for DTLS
 151          */
 152         if (!SSL_IS_DTLS(s))
 153             RECORD_LAYER_reset_read_sequence(&s->rlayer);
 154         mac_secret = &(s->s3->read_mac_secret[0]);
 155         mac_secret_size = &(s->s3->read_mac_secret_size);
 156     } else {
 157         s->statem.enc_write_state = ENC_WRITE_STATE_INVALID;
 158         if (s->ext.use_etm)
 159             s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 160         else
 161             s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC_WRITE;
 162
 163         if (s->s3->tmp.new_cipher->algorithm2 & TLS1_STREAM_MAC)
 164             s->mac_flags |= SSL_MAC_FLAG_WRITE_MAC_STREAM;
 165         else
 166             s->mac_flags &= ~SSL_MAC_FLAG_WRITE_MAC_STREAM;
 167         if (s->enc_write_ctx != NULL && !SSL_IS_DTLS(s)) {
 168             reuse_dd = 1;
 169         } else if ((s->enc_write_ctx = EVP_CIPHER_CTX_new()) == NULL) {
 170             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 171                      ERR_R_MALLOC_FAILURE);
 172             goto err;
 173         }
 174         dd = s->enc_write_ctx;
 175         if (SSL_IS_DTLS(s)) {
 176             mac_ctx = EVP_MD_CTX_new();
 177             if (mac_ctx == NULL) {
 178                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 179                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 180                          ERR_R_MALLOC_FAILURE);
 181                 goto err;
 182             }
 183             s->write_hash = mac_ctx;
 184         } else {
 185             mac_ctx = ssl_replace_hash(&s->write_hash, NULL);
 186             if (mac_ctx == NULL) {
 187                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 188                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 189                          ERR_R_MALLOC_FAILURE);
 190                 goto err;
 191             }
 192         }
 193 #ifndef OPENSSL_NO_COMP
 194         COMP_CTX_free(s->compress);
 195         s->compress = NULL;
 196         if (comp != NULL) {
 197             s->compress = COMP_CTX_new(comp->method);
 198             if (s->compress == NULL) {
 199                 SSLfatal(s, SSL_AD_INTERNAL_ERROR,
 200                          SSL_F_TLS1_CHANGE_CIPHER_STATE,
 201                         SSL_R_COMPRESSION_LIBRARY_ERROR);
 202                 goto err;
 203             }
 204         }
 205 #endif
 206         /*
 207          * this is done by dtls1_reset_seq_numbers for DTLS
 208          */
 209         if (!SSL_IS_DTLS(s))
 210             RECORD_LAYER_reset_write_sequence(&s->rlayer);
 211         mac_secret = &(s->s3->write_mac_secret[0]);
 212         mac_secret_size = &(s->s3->write_mac_secret_size);
 213     }
 214
 215     if (reuse_dd)
 216         EVP_CIPHER_CTX_reset(dd);
 217
 218     p = s->s3->tmp.key_block;
 219     i = *mac_secret_size = s->s3->tmp.new_mac_secret_size;
 220
 221     /* TODO(size_t): convert me */
 222     cl = EVP_CIPHER_key_length(c);
 223     j = cl;
 224     /* Was j=(exp)?5:EVP_CIPHER_key_length(c); */
 225     /* If GCM/CCM mode only part of IV comes from PRF */
 226     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE)
 227         k = EVP_GCM_TLS_FIXED_IV_LEN;
 228     else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE)
 229         k = EVP_CCM_TLS_FIXED_IV_LEN;
 230     else
 231         k = EVP_CIPHER_iv_length(c);
 232     if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
 233         (which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
 234         ms = &(p[0]);
 235         n = i + i;
 236         key = &(p[n]);
 237         n += j + j;
 238         iv = &(p[n]);
 239         n += k + k;
 240     } else {
 241         n = i;
 242         ms = &(p[n]);
 243         n += i + j;
 244         key = &(p[n]);
 245         n += j + k;
 246         iv = &(p[n]);
 247         n += k;
 248     }
 249
 250     if (n > s->s3->tmp.key_block_length) {
 251         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 252                  ERR_R_INTERNAL_ERROR);
 253         goto err;
 254     }
 255
 256     memcpy(mac_secret, ms, i);
 257
 258     if (!(EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
 259         /* TODO(size_t): Convert this function */
 260         mac_key = EVP_PKEY_new_mac_key(mac_type, NULL, mac_secret,
 261                                                (int)*mac_secret_size);
 262         if (mac_key == NULL
 263             || EVP_DigestSignInit(mac_ctx, NULL, m, NULL, mac_key) <= 0) {
 264             EVP_PKEY_free(mac_key);
 265             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 266                      ERR_R_INTERNAL_ERROR);
 267             goto err;
 268         }
 269         EVP_PKEY_free(mac_key);
 270     }
 271 #ifdef SSL_DEBUG
 272     printf("which = %04X\nmac key=", which);
 273     {
 274         size_t z;
 275         for (z = 0; z < i; z++)
 276             printf("%02X%c", ms[z], ((z + 1) % 16) ? ' ' : '\n');
 277     }
 278 #endif
 279
 280     if (EVP_CIPHER_mode(c) == EVP_CIPH_GCM_MODE) {
 281         if (!EVP_CipherInit_ex(dd, c, NULL, key, NULL, (which & SSL3_CC_WRITE))
 282             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_GCM_SET_IV_FIXED, (int)k,
 283                                     iv)) {
 284             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 285                      ERR_R_INTERNAL_ERROR);
 286             goto err;
 287         }
 288     } else if (EVP_CIPHER_mode(c) == EVP_CIPH_CCM_MODE) {
 289         int taglen;
 290         if (s->s3->tmp.
 291             new_cipher->algorithm_enc & (SSL_AES128CCM8 | SSL_AES256CCM8))
 292             taglen = EVP_CCM8_TLS_TAG_LEN;
 293         else
 294             taglen = EVP_CCM_TLS_TAG_LEN;
 295         if (!EVP_CipherInit_ex(dd, c, NULL, NULL, NULL, (which & SSL3_CC_WRITE))
 296             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_IVLEN, 12, NULL)
 297             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_TAG, taglen, NULL)
 298             || !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_CCM_SET_IV_FIXED, (int)k, iv)
 299             || !EVP_CipherInit_ex(dd, NULL, NULL, key, NULL, -1)) {
 300             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 301                      ERR_R_INTERNAL_ERROR);
 302             goto err;
 303         }
 304     } else {
 305         if (!EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE))) {
 306             SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 307                      ERR_R_INTERNAL_ERROR);
 308             goto err;
 309         }
 310     }
 311     /* Needed for "composite" AEADs, such as RC4-HMAC-MD5 */
 312     if ((EVP_CIPHER_flags(c) & EVP_CIPH_FLAG_AEAD_CIPHER) && *mac_secret_size
 313         && !EVP_CIPHER_CTX_ctrl(dd, EVP_CTRL_AEAD_SET_MAC_KEY,
 314                                 (int)*mac_secret_size, mac_secret)) {
 315         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_CHANGE_CIPHER_STATE,
 316                  ERR_R_INTERNAL_ERROR);
 317         goto err;
 318     }
 319     s->statem.enc_write_state = ENC_WRITE_STATE_VALID;
 320
 321 #ifdef SSL_DEBUG
 322     printf("which = %04X\nkey=", which);
 323     {
 324         int z;
 325         for (z = 0; z < EVP_CIPHER_key_length(c); z++)
 326             printf("%02X%c", key[z], ((z + 1) % 16) ? ' ' : '\n');
 327     }
 328     printf("\niv=");
 329     {
 330         size_t z;
 331         for (z = 0; z < k; z++)
 332             printf("%02X%c", iv[z], ((z + 1) % 16) ? ' ' : '\n');
 333     }
 334     printf("\n");
 335 #endif
 336
 337     OPENSSL_cleanse(tmp1, sizeof(tmp1));
 338     OPENSSL_cleanse(tmp2, sizeof(tmp1));
 339     OPENSSL_cleanse(iv1, sizeof(iv1));
 340     OPENSSL_cleanse(iv2, sizeof(iv2));
 341     return 1;
 342  err:
 343     OPENSSL_cleanse(tmp1, sizeof(tmp1));
 344     OPENSSL_cleanse(tmp2, sizeof(tmp1));
 345     OPENSSL_cleanse(iv1, sizeof(iv1));
 346     OPENSSL_cleanse(iv2, sizeof(iv2));
 347     return 0;
 348 }
 349
 350 int tls1_setup_key_block(SSL *s)
 351 {
 352     unsigned char *p;
 353     const EVP_CIPHER *c;
 354     const EVP_MD *hash;
 355     SSL_COMP *comp;
 356     int mac_type = NID_undef;
 357     size_t num, mac_secret_size = 0;
 358     int ret = 0;
 359
 360     if (s->s3->tmp.key_block_length != 0)
 361         return 1;
 362
 363     if (!ssl_cipher_get_evp(s->session, &c, &hash, &mac_type, &mac_secret_size,
 364                             &comp, s->ext.use_etm)) {
 365         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 366                  SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
 367         return 0;
 368     }
 369
 370     s->s3->tmp.new_sym_enc = c;
 371     s->s3->tmp.new_hash = hash;
 372     s->s3->tmp.new_mac_pkey_type = mac_type;
 373     s->s3->tmp.new_mac_secret_size = mac_secret_size;
 374     num = EVP_CIPHER_key_length(c) + mac_secret_size + EVP_CIPHER_iv_length(c);
 375     num *= 2;
 376
 377     ssl3_cleanup_key_block(s);
 378
 379     if ((p = OPENSSL_malloc(num)) == NULL) {
 380         SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_F_TLS1_SETUP_KEY_BLOCK,
 381                  ERR_R_MALLOC_FAILURE);
 382         goto err;
 383     }
 384
 385     s->s3->tmp.key_block_length = num;
 386     s->s3->tmp.key_block = p;
 387
 388 #ifdef SSL_DEBUG
 389     printf("client random\n");
 390     {
 391         int z;
 392         for (z = 0; z < SSL3_RANDOM_SIZE; z++)
 393             printf("%02X%c", s->s3->client_random[z],
 394                    ((z + 1) % 16) ? ' ' : '\n');
 395     }
 396     printf("server random\n");
 397     {
 398         int z;
 399         for (z = 0; z < SSL3_RANDOM_SIZE; z++)
 400             printf("%02X%c", s->s3->server_random[z],
 401                    ((z + 1) % 16) ? ' ' : '\n');
 402     }
 403     printf("master key\n");
 404     {
 405         size_t z;
 406         for (z = 0; z < s->session->master_key_length; z++)
 407             printf("%02X%c", s->session->master_key[z],
 408                    ((z + 1) % 16) ? ' ' : '\n');
 409     }
 410 #endif
 411     if (!tls1_generate_key_block(s, p, num)) {
 412         /* SSLfatal() already called */
 413         goto err;
 414     }
 415 #ifdef SSL_DEBUG
 416     printf("\nkey block\n");
 417     {
 418         size_t z;
 419         for (z = 0; z < num; z++)
 420             printf("%02X%c", p[z], ((z + 1) % 16) ? ' ' : '\n');
 421     }
 422 #endif
 423
 424     if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)
 425         && s->method->version <= TLS1_VERSION) {
 426         /*
 427          * enable vulnerability countermeasure for CBC ciphers with known-IV
 428          * problem (http://www.openssl.org/~bodo/tls-cbc.txt)
 429          */
 430         s->s3->need_empty_fragments = 1;
 431
 432         if (s->session->cipher != NULL) {
 433             if (s->session->cipher->algorithm_enc == SSL_eNULL)
 434                 s->s3->need_empty_fragments = 0;
 435
 436 #ifndef OPENSSL_NO_RC4
 437             if (s->session->cipher->algorithm_enc == SSL_RC4)
 438                 s->s3->need_empty_fragments = 0;
 439 #endif
 440         }
 441     }
 442
 443     ret = 1;
 444  err:
 445     return ret;
 446 }
 447
 448 size_t tls1_final_finish_mac(SSL *s, const char *str, size_t slen,
 449                              unsigned char *out)
 450 {
 451     size_t hashlen;
 452     unsigned char hash[EVP_MAX_MD_SIZE];
 453
 454     if (!ssl3_digest_cached_records(s, 0)) {
 455         /* SSLfatal() already called */
 456         return 0;
 457     }
 458
 459     if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 460         /* SSLfatal() already called */
 461         return 0;
 462     }
 463
 464     if (!tls1_PRF(s, str, slen, hash, hashlen, NULL, 0, NULL, 0, NULL, 0,
 465                   s->session->master_key, s->session->master_key_length,
 466                   out, TLS1_FINISH_MAC_LENGTH, 1)) {
 467         /* SSLfatal() already called */
 468         return 0;
 469     }
 470     OPENSSL_cleanse(hash, hashlen);
 471     return TLS1_FINISH_MAC_LENGTH;
 472 }
 473
 474 int tls1_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p,
 475                                 size_t len, size_t *secret_size)
 476 {
 477     if (s->session->flags & SSL_SESS_FLAG_EXTMS) {
 478         unsigned char hash[EVP_MAX_MD_SIZE * 2];
 479         size_t hashlen;
 480         /*
 481          * Digest cached records keeping record buffer (if present): this wont
 482          * affect client auth because we're freezing the buffer at the same
 483          * point (after client key exchange and before certificate verify)
 484          */
 485         if (!ssl3_digest_cached_records(s, 1)
 486                 || !ssl_handshake_hash(s, hash, sizeof(hash), &hashlen)) {
 487             /* SSLfatal() already called */
 488             return 0;
 489         }
 490 #ifdef SSL_DEBUG
 491         fprintf(stderr, "Handshake hashes:\n");
 492         BIO_dump_fp(stderr, (char *)hash, hashlen);
 493 #endif
 494         if (!tls1_PRF(s,
 495                       TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 496                       TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE,
 497                       hash, hashlen,
 498                       NULL, 0,
 499                       NULL, 0,
 500                       NULL, 0, p, len, out,
 501                       SSL3_MASTER_SECRET_SIZE, 1)) {
 502             /* SSLfatal() already called */
 503             return 0;
 504         }
 505         OPENSSL_cleanse(hash, hashlen);
 506     } else {
 507         if (!tls1_PRF(s,
 508                       TLS_MD_MASTER_SECRET_CONST,
 509                       TLS_MD_MASTER_SECRET_CONST_SIZE,
 510                       s->s3->client_random, SSL3_RANDOM_SIZE,
 511                       NULL, 0,
 512                       s->s3->server_random, SSL3_RANDOM_SIZE,
 513                       NULL, 0, p, len, out,
 514                       SSL3_MASTER_SECRET_SIZE, 1)) {
 515            /* SSLfatal() already called */
 516             return 0;
 517         }
 518     }
 519 #ifdef SSL_DEBUG
 520     fprintf(stderr, "Premaster Secret:\n");
 521     BIO_dump_fp(stderr, (char *)p, len);
 522     fprintf(stderr, "Client Random:\n");
 523     BIO_dump_fp(stderr, (char *)s->s3->client_random, SSL3_RANDOM_SIZE);
 524     fprintf(stderr, "Server Random:\n");
 525     BIO_dump_fp(stderr, (char *)s->s3->server_random, SSL3_RANDOM_SIZE);
 526     fprintf(stderr, "Master Secret:\n");
 527     BIO_dump_fp(stderr, (char *)s->session->master_key,
 528                 SSL3_MASTER_SECRET_SIZE);
 529 #endif
 530
 531     *secret_size = SSL3_MASTER_SECRET_SIZE;
 532     return 1;
 533 }
 534
 535 int tls1_export_keying_material(SSL *s, unsigned char *out, size_t olen,
 536                                 const char *label, size_t llen,
 537                                 const unsigned char *context,
 538                                 size_t contextlen, int use_context)
 539 {
 540     unsigned char *val = NULL;
 541     size_t vallen = 0, currentvalpos;
 542     int rv;
 543
 544     /*
 545      * construct PRF arguments we construct the PRF argument ourself rather
 546      * than passing separate values into the TLS PRF to ensure that the
 547      * concatenation of values does not create a prohibited label.
 548      */
 549     vallen = llen + SSL3_RANDOM_SIZE * 2;
 550     if (use_context) {
 551         vallen += 2 + contextlen;
 552     }
 553
 554     val = OPENSSL_malloc(vallen);
 555     if (val == NULL)
 556         goto err2;
 557     currentvalpos = 0;
 558     memcpy(val + currentvalpos, (unsigned char *)label, llen);
 559     currentvalpos += llen;
 560     memcpy(val + currentvalpos, s->s3->client_random, SSL3_RANDOM_SIZE);
 561     currentvalpos += SSL3_RANDOM_SIZE;
 562     memcpy(val + currentvalpos, s->s3->server_random, SSL3_RANDOM_SIZE);
 563     currentvalpos += SSL3_RANDOM_SIZE;
 564
 565     if (use_context) {
 566         val[currentvalpos] = (contextlen >> 8) & 0xff;
 567         currentvalpos++;
 568         val[currentvalpos] = contextlen & 0xff;
 569         currentvalpos++;
 570         if ((contextlen > 0) || (context != NULL)) {
 571             memcpy(val + currentvalpos, context, contextlen);
 572         }
 573     }
 574
 575     /*
 576      * disallow prohibited labels note that SSL3_RANDOM_SIZE > max(prohibited
 577      * label len) = 15, so size of val > max(prohibited label len) = 15 and
 578      * the comparisons won't have buffer overflow
 579      */
 580     if (memcmp(val, TLS_MD_CLIENT_FINISH_CONST,
 581                TLS_MD_CLIENT_FINISH_CONST_SIZE) == 0)
 582         goto err1;
 583     if (memcmp(val, TLS_MD_SERVER_FINISH_CONST,
 584                TLS_MD_SERVER_FINISH_CONST_SIZE) == 0)
 585         goto err1;
 586     if (memcmp(val, TLS_MD_MASTER_SECRET_CONST,
 587                TLS_MD_MASTER_SECRET_CONST_SIZE) == 0)
 588         goto err1;
 589     if (memcmp(val, TLS_MD_EXTENDED_MASTER_SECRET_CONST,
 590                TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE) == 0)
 591         goto err1;
 592     if (memcmp(val, TLS_MD_KEY_EXPANSION_CONST,
 593                TLS_MD_KEY_EXPANSION_CONST_SIZE) == 0)
 594         goto err1;
 595
 596     rv = tls1_PRF(s,
 597                   val, vallen,
 598                   NULL, 0,
 599                   NULL, 0,
 600                   NULL, 0,
 601                   NULL, 0,
 602                   s->session->master_key, s->session->master_key_length,
 603                   out, olen, 0);
 604
 605     goto ret;
 606  err1:
 607     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, SSL_R_TLS_ILLEGAL_EXPORTER_LABEL);
 608     rv = 0;
 609     goto ret;
 610  err2:
 611     SSLerr(SSL_F_TLS1_EXPORT_KEYING_MATERIAL, ERR_R_MALLOC_FAILURE);
 612     rv = 0;
 613  ret:
 614     OPENSSL_clear_free(val, vallen);
 615     return rv;
 616 }
 617
 618 int tls1_alert_code(int code)
 619 {
 620     switch (code) {
 621     case SSL_AD_CLOSE_NOTIFY:
 622         return SSL3_AD_CLOSE_NOTIFY;
 623     case SSL_AD_UNEXPECTED_MESSAGE:
 624         return SSL3_AD_UNEXPECTED_MESSAGE;
 625     case SSL_AD_BAD_RECORD_MAC:
 626         return SSL3_AD_BAD_RECORD_MAC;
 627     case SSL_AD_DECRYPTION_FAILED:
 628         return TLS1_AD_DECRYPTION_FAILED;
 629     case SSL_AD_RECORD_OVERFLOW:
 630         return TLS1_AD_RECORD_OVERFLOW;
 631     case SSL_AD_DECOMPRESSION_FAILURE:
 632         return SSL3_AD_DECOMPRESSION_FAILURE;
 633     case SSL_AD_HANDSHAKE_FAILURE:
 634         return SSL3_AD_HANDSHAKE_FAILURE;
 635     case SSL_AD_NO_CERTIFICATE:
 636         return -1;
 637     case SSL_AD_BAD_CERTIFICATE:
 638         return SSL3_AD_BAD_CERTIFICATE;
 639     case SSL_AD_UNSUPPORTED_CERTIFICATE:
 640         return SSL3_AD_UNSUPPORTED_CERTIFICATE;
 641     case SSL_AD_CERTIFICATE_REVOKED:
 642         return SSL3_AD_CERTIFICATE_REVOKED;
 643     case SSL_AD_CERTIFICATE_EXPIRED:
 644         return SSL3_AD_CERTIFICATE_EXPIRED;
 645     case SSL_AD_CERTIFICATE_UNKNOWN:
 646         return SSL3_AD_CERTIFICATE_UNKNOWN;
 647     case SSL_AD_ILLEGAL_PARAMETER:
 648         return SSL3_AD_ILLEGAL_PARAMETER;
 649     case SSL_AD_UNKNOWN_CA:
 650         return TLS1_AD_UNKNOWN_CA;
 651     case SSL_AD_ACCESS_DENIED:
 652         return TLS1_AD_ACCESS_DENIED;
 653     case SSL_AD_DECODE_ERROR:
 654         return TLS1_AD_DECODE_ERROR;
 655     case SSL_AD_DECRYPT_ERROR:
 656         return TLS1_AD_DECRYPT_ERROR;
 657     case SSL_AD_EXPORT_RESTRICTION:
 658         return TLS1_AD_EXPORT_RESTRICTION;
 659     case SSL_AD_PROTOCOL_VERSION:
 660         return TLS1_AD_PROTOCOL_VERSION;
 661     case SSL_AD_INSUFFICIENT_SECURITY:
 662         return TLS1_AD_INSUFFICIENT_SECURITY;
 663     case SSL_AD_INTERNAL_ERROR:
 664         return TLS1_AD_INTERNAL_ERROR;
 665     case SSL_AD_USER_CANCELLED:
 666         return TLS1_AD_USER_CANCELLED;
 667     case SSL_AD_NO_RENEGOTIATION:
 668         return TLS1_AD_NO_RENEGOTIATION;
 669     case SSL_AD_UNSUPPORTED_EXTENSION:
 670         return TLS1_AD_UNSUPPORTED_EXTENSION;
 671     case SSL_AD_CERTIFICATE_UNOBTAINABLE:
 672         return TLS1_AD_CERTIFICATE_UNOBTAINABLE;
 673     case SSL_AD_UNRECOGNIZED_NAME:
 674         return TLS1_AD_UNRECOGNIZED_NAME;
 675     case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE:
 676         return TLS1_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
 677     case SSL_AD_BAD_CERTIFICATE_HASH_VALUE:
 678         return TLS1_AD_BAD_CERTIFICATE_HASH_VALUE;
 679     case SSL_AD_UNKNOWN_PSK_IDENTITY:
 680         return TLS1_AD_UNKNOWN_PSK_IDENTITY;
 681     case SSL_AD_INAPPROPRIATE_FALLBACK:
 682         return TLS1_AD_INAPPROPRIATE_FALLBACK;
 683     case SSL_AD_NO_APPLICATION_PROTOCOL:
 684         return TLS1_AD_NO_APPLICATION_PROTOCOL;
 685     case SSL_AD_CERTIFICATE_REQUIRED:
 686         return SSL_AD_HANDSHAKE_FAILURE;
 687     default:
 688         return -1;
 689     }
 690 }