1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] 56 */ 57 /* ==================================================================== 58 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 59 * 60 * Redistribution and use in source and binary forms, with or without 61 * modification, are permitted provided that the following conditions 62 * are met: 63 * 64 * 1. Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer. 66 * 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in 69 * the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3. All advertising materials mentioning features or use of this 73 * software must display the following acknowledgment: 74 * "This product includes software developed by the OpenSSL Project 75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 76 * 77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 78 * endorse or promote products derived from this software without 79 * prior written permission. For written permission, please contact 80 * openssl-core (at) openssl.org. 81 * 82 * 5. Products derived from this software may not be called "OpenSSL" 83 * nor may "OpenSSL" appear in their names without prior written 84 * permission of the OpenSSL Project. 85 * 86 * 6. Redistributions of any form whatsoever must retain the following 87 * acknowledgment: 88 * "This product includes software developed by the OpenSSL Project 89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 102 * OF THE POSSIBILITY OF SUCH DAMAGE. 103 * ==================================================================== 104 * 105 * This product includes cryptographic software written by Eric Young 106 * (eay (at) cryptsoft.com). This product includes software written by Tim 107 * Hudson (tjh (at) cryptsoft.com). 108 * 109 */ 110 /* ==================================================================== 111 * Copyright 2005 Nokia. All rights reserved. 112 * 113 * The portions of the attached software ("Contribution") is developed by 114 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 115 * license. 116 * 117 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 118 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 119 * support (see RFC 4279) to OpenSSL. 120 * 121 * No patent licenses or other rights except those expressly stated in 122 * the OpenSSL open source license shall be deemed granted or received 123 * expressly, by implication, estoppel, or otherwise. 124 * 125 * No assurances are provided by Nokia that the Contribution does not 126 * infringe the patent or other intellectual property rights of any third 127 * party or that the license provides you with all the necessary rights 128 * to make use of the Contribution. 129 * 130 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 131 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 132 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 133 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 134 * OTHERWISE. */ 135 136 #include <openssl/ssl.h> 137 138 #include <assert.h> 139 #include <string.h> 140 141 #include <utility> 142 143 #include <openssl/err.h> 144 #include <openssl/evp.h> 145 #include <openssl/hmac.h> 146 #include <openssl/md5.h> 147 #include <openssl/mem.h> 148 #include <openssl/nid.h> 149 #include <openssl/rand.h> 150 151 #include "../crypto/fipsmodule/tls/internal.h" 152 #include "../crypto/internal.h" 153 #include "internal.h" 154 155 156 namespace bssl { 157 158 bool tls1_prf(const EVP_MD *digest, Span<uint8_t> out, 159 Span<const uint8_t> secret, Span<const char> label, 160 Span<const uint8_t> seed1, Span<const uint8_t> seed2) { 161 return 1 == CRYPTO_tls1_prf(digest, out.data(), out.size(), secret.data(), 162 secret.size(), label.data(), label.size(), 163 seed1.data(), seed1.size(), seed2.data(), 164 seed2.size()); 165 } 166 167 static bool ssl3_prf(Span<uint8_t> out, Span<const uint8_t> secret, 168 Span<const char> label, Span<const uint8_t> seed1, 169 Span<const uint8_t> seed2) { 170 ScopedEVP_MD_CTX md5; 171 ScopedEVP_MD_CTX sha1; 172 uint8_t buf[16], smd[SHA_DIGEST_LENGTH]; 173 uint8_t c = 'A'; 174 size_t k = 0; 175 while (!out.empty()) { 176 k++; 177 if (k > sizeof(buf)) { 178 // bug: 'buf' is too small for this ciphersuite 179 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 180 return false; 181 } 182 183 for (size_t j = 0; j < k; j++) { 184 buf[j] = c; 185 } 186 c++; 187 if (!EVP_DigestInit_ex(sha1.get(), EVP_sha1(), NULL)) { 188 OPENSSL_PUT_ERROR(SSL, ERR_LIB_EVP); 189 return false; 190 } 191 EVP_DigestUpdate(sha1.get(), buf, k); 192 EVP_DigestUpdate(sha1.get(), secret.data(), secret.size()); 193 // |label| is ignored for SSLv3. 194 EVP_DigestUpdate(sha1.get(), seed1.data(), seed1.size()); 195 EVP_DigestUpdate(sha1.get(), seed2.data(), seed2.size()); 196 EVP_DigestFinal_ex(sha1.get(), smd, NULL); 197 198 if (!EVP_DigestInit_ex(md5.get(), EVP_md5(), NULL)) { 199 OPENSSL_PUT_ERROR(SSL, ERR_LIB_EVP); 200 return false; 201 } 202 EVP_DigestUpdate(md5.get(), secret.data(), secret.size()); 203 EVP_DigestUpdate(md5.get(), smd, SHA_DIGEST_LENGTH); 204 if (out.size() < MD5_DIGEST_LENGTH) { 205 EVP_DigestFinal_ex(md5.get(), smd, NULL); 206 OPENSSL_memcpy(out.data(), smd, out.size()); 207 break; 208 } 209 EVP_DigestFinal_ex(md5.get(), out.data(), NULL); 210 out = out.subspan(MD5_DIGEST_LENGTH); 211 } 212 213 OPENSSL_cleanse(smd, SHA_DIGEST_LENGTH); 214 return true; 215 } 216 217 static bool get_key_block_lengths(const SSL *ssl, size_t *out_mac_secret_len, 218 size_t *out_key_len, size_t *out_iv_len, 219 const SSL_CIPHER *cipher) { 220 const EVP_AEAD *aead = NULL; 221 if (!ssl_cipher_get_evp_aead(&aead, out_mac_secret_len, out_iv_len, cipher, 222 ssl_protocol_version(ssl), SSL_is_dtls(ssl))) { 223 OPENSSL_PUT_ERROR(SSL, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); 224 return false; 225 } 226 227 *out_key_len = EVP_AEAD_key_length(aead); 228 if (*out_mac_secret_len > 0) { 229 // For "stateful" AEADs (i.e. compatibility with pre-AEAD cipher suites) the 230 // key length reported by |EVP_AEAD_key_length| will include the MAC key 231 // bytes and initial implicit IV. 232 if (*out_key_len < *out_mac_secret_len + *out_iv_len) { 233 OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR); 234 return false; 235 } 236 *out_key_len -= *out_mac_secret_len + *out_iv_len; 237 } 238 239 return true; 240 } 241 242 int tls1_configure_aead(SSL *ssl, evp_aead_direction_t direction, 243 Array<uint8_t> *key_block_cache, 244 const SSL_CIPHER *cipher, 245 Span<const uint8_t> iv_override) { 246 size_t mac_secret_len, key_len, iv_len; 247 if (!get_key_block_lengths(ssl, &mac_secret_len, &key_len, &iv_len, cipher)) { 248 return 0; 249 } 250 251 // Ensure that |key_block_cache| is set up. 252 const size_t key_block_size = 2 * (mac_secret_len + key_len + iv_len); 253 if (key_block_cache->empty()) { 254 if (!key_block_cache->Init(key_block_size) || 255 !SSL_generate_key_block(ssl, key_block_cache->data(), key_block_size)) { 256 return 0; 257 } 258 } 259 assert(key_block_cache->size() == key_block_size); 260 261 Span<const uint8_t> key_block = *key_block_cache; 262 Span<const uint8_t> mac_secret, key, iv; 263 if (direction == (ssl->server ? evp_aead_open : evp_aead_seal)) { 264 // Use the client write (server read) keys. 265 mac_secret = key_block.subspan(0, mac_secret_len); 266 key = key_block.subspan(2 * mac_secret_len, key_len); 267 iv = key_block.subspan(2 * mac_secret_len + 2 * key_len, iv_len); 268 } else { 269 // Use the server write (client read) keys. 270 mac_secret = key_block.subspan(mac_secret_len, mac_secret_len); 271 key = key_block.subspan(2 * mac_secret_len + key_len, key_len); 272 iv = key_block.subspan(2 * mac_secret_len + 2 * key_len + iv_len, iv_len); 273 } 274 275 if (!iv_override.empty()) { 276 if (iv_override.size() != iv_len) { 277 return 0; 278 } 279 iv = iv_override; 280 } 281 282 UniquePtr<SSLAEADContext> aead_ctx = SSLAEADContext::Create( 283 direction, ssl->version, SSL_is_dtls(ssl), cipher, key, mac_secret, iv); 284 if (!aead_ctx) { 285 return 0; 286 } 287 288 if (direction == evp_aead_open) { 289 return ssl->method->set_read_state(ssl, std::move(aead_ctx)); 290 } 291 292 return ssl->method->set_write_state(ssl, std::move(aead_ctx)); 293 } 294 295 int tls1_change_cipher_state(SSL_HANDSHAKE *hs, 296 evp_aead_direction_t direction) { 297 return tls1_configure_aead(hs->ssl, direction, &hs->key_block, 298 hs->new_cipher, {}); 299 } 300 301 int tls1_generate_master_secret(SSL_HANDSHAKE *hs, uint8_t *out, 302 Span<const uint8_t> premaster) { 303 static const char kMasterSecretLabel[] = "master secret"; 304 static const char kExtendedMasterSecretLabel[] = "extended master secret"; 305 306 const SSL *ssl = hs->ssl; 307 auto out_span = MakeSpan(out, SSL3_MASTER_SECRET_SIZE); 308 if (hs->extended_master_secret) { 309 auto label = MakeConstSpan(kExtendedMasterSecretLabel, 310 sizeof(kExtendedMasterSecretLabel) - 1); 311 uint8_t digests[EVP_MAX_MD_SIZE]; 312 size_t digests_len; 313 if (!hs->transcript.GetHash(digests, &digests_len) || 314 !tls1_prf(hs->transcript.Digest(), out_span, premaster, label, 315 MakeConstSpan(digests, digests_len), {})) { 316 return 0; 317 } 318 } else { 319 auto label = 320 MakeConstSpan(kMasterSecretLabel, sizeof(kMasterSecretLabel) - 1); 321 if (ssl_protocol_version(ssl) == SSL3_VERSION) { 322 if (!ssl3_prf(out_span, premaster, label, ssl->s3->client_random, 323 ssl->s3->server_random)) { 324 return 0; 325 } 326 } else { 327 if (!tls1_prf(hs->transcript.Digest(), out_span, premaster, label, 328 ssl->s3->client_random, ssl->s3->server_random)) { 329 return 0; 330 } 331 } 332 } 333 334 return SSL3_MASTER_SECRET_SIZE; 335 } 336 337 } // namespace bssl 338 339 using namespace bssl; 340 341 size_t SSL_get_key_block_len(const SSL *ssl) { 342 size_t mac_secret_len, key_len, fixed_iv_len; 343 if (!get_key_block_lengths(ssl, &mac_secret_len, &key_len, &fixed_iv_len, 344 SSL_get_current_cipher(ssl))) { 345 ERR_clear_error(); 346 return 0; 347 } 348 349 return 2 * (mac_secret_len + key_len + fixed_iv_len); 350 } 351 352 int SSL_generate_key_block(const SSL *ssl, uint8_t *out, size_t out_len) { 353 const SSL_SESSION *session = SSL_get_session(ssl); 354 auto out_span = MakeSpan(out, out_len); 355 auto master_key = 356 MakeConstSpan(session->master_key, session->master_key_length); 357 static const char kLabel[] = "key expansion"; 358 auto label = MakeConstSpan(kLabel, sizeof(kLabel) - 1); 359 360 if (ssl_protocol_version(ssl) == SSL3_VERSION) { 361 return ssl3_prf(out_span, master_key, label, ssl->s3->server_random, 362 ssl->s3->client_random); 363 } 364 365 const EVP_MD *digest = ssl_session_get_digest(session); 366 return tls1_prf(digest, out_span, master_key, label, ssl->s3->server_random, 367 ssl->s3->client_random); 368 } 369 370 int SSL_export_keying_material(SSL *ssl, uint8_t *out, size_t out_len, 371 const char *label, size_t label_len, 372 const uint8_t *context, size_t context_len, 373 int use_context) { 374 if (!ssl->s3->have_version || ssl->version == SSL3_VERSION) { 375 OPENSSL_PUT_ERROR(SSL, SSL_R_HANDSHAKE_NOT_COMPLETE); 376 return 0; 377 } 378 379 // Exporters may be used in False Start and server 0-RTT, where the handshake 380 // has progressed enough. Otherwise, they may not be used during a handshake. 381 if (SSL_in_init(ssl) && 382 !SSL_in_false_start(ssl) && 383 !(SSL_is_server(ssl) && SSL_in_early_data(ssl))) { 384 OPENSSL_PUT_ERROR(SSL, SSL_R_HANDSHAKE_NOT_COMPLETE); 385 return 0; 386 } 387 388 if (ssl_protocol_version(ssl) >= TLS1_3_VERSION) { 389 if (!use_context) { 390 context = nullptr; 391 context_len = 0; 392 } 393 return tls13_export_keying_material( 394 ssl, MakeSpan(out, out_len), 395 MakeConstSpan(ssl->s3->exporter_secret, ssl->s3->exporter_secret_len), 396 MakeConstSpan(label, label_len), MakeConstSpan(context, context_len)); 397 } 398 399 size_t seed_len = 2 * SSL3_RANDOM_SIZE; 400 if (use_context) { 401 if (context_len >= 1u << 16) { 402 OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW); 403 return 0; 404 } 405 seed_len += 2 + context_len; 406 } 407 Array<uint8_t> seed; 408 if (!seed.Init(seed_len)) { 409 OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE); 410 return 0; 411 } 412 413 OPENSSL_memcpy(seed.data(), ssl->s3->client_random, SSL3_RANDOM_SIZE); 414 OPENSSL_memcpy(seed.data() + SSL3_RANDOM_SIZE, ssl->s3->server_random, 415 SSL3_RANDOM_SIZE); 416 if (use_context) { 417 seed[2 * SSL3_RANDOM_SIZE] = static_cast<uint8_t>(context_len >> 8); 418 seed[2 * SSL3_RANDOM_SIZE + 1] = static_cast<uint8_t>(context_len); 419 OPENSSL_memcpy(seed.data() + 2 * SSL3_RANDOM_SIZE + 2, context, context_len); 420 } 421 422 const SSL_SESSION *session = SSL_get_session(ssl); 423 const EVP_MD *digest = ssl_session_get_digest(session); 424 return tls1_prf( 425 digest, MakeSpan(out, out_len), 426 MakeConstSpan(session->master_key, session->master_key_length), 427 MakeConstSpan(label, label_len), seed, {}); 428 } 429 430 int SSL_export_early_keying_material( 431 SSL *ssl, uint8_t *out, size_t out_len, const char *label, size_t label_len, 432 const uint8_t *context, size_t context_len) { 433 if (!SSL_in_early_data(ssl) && 434 (!ssl->s3->have_version || 435 ssl_protocol_version(ssl) < TLS1_3_VERSION)) { 436 OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SSL_VERSION); 437 return 0; 438 } 439 440 // The early exporter only exists if we accepted early data or offered it as 441 // a client. 442 if (!SSL_in_early_data(ssl) && !SSL_early_data_accepted(ssl)) { 443 OPENSSL_PUT_ERROR(SSL, SSL_R_EARLY_DATA_NOT_IN_USE); 444 return 0; 445 } 446 447 return tls13_export_keying_material( 448 ssl, MakeSpan(out, out_len), 449 MakeConstSpan(ssl->s3->early_exporter_secret, 450 ssl->s3->early_exporter_secret_len), 451 MakeConstSpan(label, label_len), MakeConstSpan(context, context_len)); 452 } 453
