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- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
- /* ====================================================================
- * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * openssl-core@openssl.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
- *
- */
- /* ====================================================================
- * Copyright 2005 Nokia. All rights reserved.
- *
- * The portions of the attached software ("Contribution") is developed by
- * Nokia Corporation and is licensed pursuant to the OpenSSL open source
- * license.
- *
- * The Contribution, originally written by Mika Kousa and Pasi Eronen of
- * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
- * support (see RFC 4279) to OpenSSL.
- *
- * No patent licenses or other rights except those expressly stated in
- * the OpenSSL open source license shall be deemed granted or received
- * expressly, by implication, estoppel, or otherwise.
- *
- * No assurances are provided by Nokia that the Contribution does not
- * infringe the patent or other intellectual property rights of any third
- * party or that the license provides you with all the necessary rights
- * to make use of the Contribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
- * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
- * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
- * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
- * OTHERWISE. */
-
- #include <openssl/ssl.h>
-
- #include <assert.h>
- #include <string.h>
-
- #include <utility>
-
- #include <openssl/err.h>
- #include <openssl/evp.h>
- #include <openssl/hmac.h>
- #include <openssl/md5.h>
- #include <openssl/mem.h>
- #include <openssl/nid.h>
- #include <openssl/rand.h>
-
- #include "../crypto/fipsmodule/tls/internal.h"
- #include "../crypto/internal.h"
- #include "internal.h"
-
-
- namespace bssl {
-
- bool tls1_prf(const EVP_MD *digest, Span<uint8_t> out,
- Span<const uint8_t> secret, Span<const char> label,
- Span<const uint8_t> seed1, Span<const uint8_t> seed2) {
- return 1 == CRYPTO_tls1_prf(digest, out.data(), out.size(), secret.data(),
- secret.size(), label.data(), label.size(),
- seed1.data(), seed1.size(), seed2.data(),
- seed2.size());
- }
-
- static bool get_key_block_lengths(const SSL *ssl, size_t *out_mac_secret_len,
- size_t *out_key_len, size_t *out_iv_len,
- const SSL_CIPHER *cipher) {
- const EVP_AEAD *aead = NULL;
- if (!ssl_cipher_get_evp_aead(&aead, out_mac_secret_len, out_iv_len, cipher,
- ssl_protocol_version(ssl), SSL_is_dtls(ssl))) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
- return false;
- }
-
- *out_key_len = EVP_AEAD_key_length(aead);
- if (*out_mac_secret_len > 0) {
- // For "stateful" AEADs (i.e. compatibility with pre-AEAD cipher suites) the
- // key length reported by |EVP_AEAD_key_length| will include the MAC key
- // bytes and initial implicit IV.
- if (*out_key_len < *out_mac_secret_len + *out_iv_len) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return false;
- }
- *out_key_len -= *out_mac_secret_len + *out_iv_len;
- }
-
- return true;
- }
-
- int tls1_configure_aead(SSL *ssl, evp_aead_direction_t direction,
- Array<uint8_t> *key_block_cache,
- const SSL_CIPHER *cipher,
- Span<const uint8_t> iv_override) {
- size_t mac_secret_len, key_len, iv_len;
- if (!get_key_block_lengths(ssl, &mac_secret_len, &key_len, &iv_len, cipher)) {
- return 0;
- }
-
- // Ensure that |key_block_cache| is set up.
- const size_t key_block_size = 2 * (mac_secret_len + key_len + iv_len);
- if (key_block_cache->empty()) {
- if (!key_block_cache->Init(key_block_size) ||
- !SSL_generate_key_block(ssl, key_block_cache->data(), key_block_size)) {
- return 0;
- }
- }
- assert(key_block_cache->size() == key_block_size);
-
- Span<const uint8_t> key_block = *key_block_cache;
- Span<const uint8_t> mac_secret, key, iv;
- if (direction == (ssl->server ? evp_aead_open : evp_aead_seal)) {
- // Use the client write (server read) keys.
- mac_secret = key_block.subspan(0, mac_secret_len);
- key = key_block.subspan(2 * mac_secret_len, key_len);
- iv = key_block.subspan(2 * mac_secret_len + 2 * key_len, iv_len);
- } else {
- // Use the server write (client read) keys.
- mac_secret = key_block.subspan(mac_secret_len, mac_secret_len);
- key = key_block.subspan(2 * mac_secret_len + key_len, key_len);
- iv = key_block.subspan(2 * mac_secret_len + 2 * key_len + iv_len, iv_len);
- }
-
- if (!iv_override.empty()) {
- if (iv_override.size() != iv_len) {
- return 0;
- }
- iv = iv_override;
- }
-
- UniquePtr<SSLAEADContext> aead_ctx = SSLAEADContext::Create(
- direction, ssl->version, SSL_is_dtls(ssl), cipher, key, mac_secret, iv);
- if (!aead_ctx) {
- return 0;
- }
-
- if (direction == evp_aead_open) {
- return ssl->method->set_read_state(ssl, std::move(aead_ctx));
- }
-
- return ssl->method->set_write_state(ssl, std::move(aead_ctx));
- }
-
- int tls1_change_cipher_state(SSL_HANDSHAKE *hs,
- evp_aead_direction_t direction) {
- return tls1_configure_aead(hs->ssl, direction, &hs->key_block,
- hs->new_cipher, {});
- }
-
- int tls1_generate_master_secret(SSL_HANDSHAKE *hs, uint8_t *out,
- Span<const uint8_t> premaster) {
- static const char kMasterSecretLabel[] = "master secret";
- static const char kExtendedMasterSecretLabel[] = "extended master secret";
-
- const SSL *ssl = hs->ssl;
- auto out_span = MakeSpan(out, SSL3_MASTER_SECRET_SIZE);
- if (hs->extended_master_secret) {
- auto label = MakeConstSpan(kExtendedMasterSecretLabel,
- sizeof(kExtendedMasterSecretLabel) - 1);
- uint8_t digests[EVP_MAX_MD_SIZE];
- size_t digests_len;
- if (!hs->transcript.GetHash(digests, &digests_len) ||
- !tls1_prf(hs->transcript.Digest(), out_span, premaster, label,
- MakeConstSpan(digests, digests_len), {})) {
- return 0;
- }
- } else {
- auto label =
- MakeConstSpan(kMasterSecretLabel, sizeof(kMasterSecretLabel) - 1);
- if (!tls1_prf(hs->transcript.Digest(), out_span, premaster, label,
- ssl->s3->client_random, ssl->s3->server_random)) {
- return 0;
- }
- }
-
- return SSL3_MASTER_SECRET_SIZE;
- }
-
- } // namespace bssl
-
- using namespace bssl;
-
- size_t SSL_get_key_block_len(const SSL *ssl) {
- size_t mac_secret_len, key_len, fixed_iv_len;
- if (!get_key_block_lengths(ssl, &mac_secret_len, &key_len, &fixed_iv_len,
- SSL_get_current_cipher(ssl))) {
- ERR_clear_error();
- return 0;
- }
-
- return 2 * (mac_secret_len + key_len + fixed_iv_len);
- }
-
- int SSL_generate_key_block(const SSL *ssl, uint8_t *out, size_t out_len) {
- const SSL_SESSION *session = SSL_get_session(ssl);
- auto out_span = MakeSpan(out, out_len);
- auto master_key =
- MakeConstSpan(session->master_key, session->master_key_length);
- static const char kLabel[] = "key expansion";
- auto label = MakeConstSpan(kLabel, sizeof(kLabel) - 1);
-
- const EVP_MD *digest = ssl_session_get_digest(session);
- return tls1_prf(digest, out_span, master_key, label, ssl->s3->server_random,
- ssl->s3->client_random);
- }
-
- int SSL_export_keying_material(SSL *ssl, uint8_t *out, size_t out_len,
- const char *label, size_t label_len,
- const uint8_t *context, size_t context_len,
- int use_context) {
- // Exporters may be used in False Start and server 0-RTT, where the handshake
- // has progressed enough. Otherwise, they may not be used during a handshake.
- if (SSL_in_init(ssl) &&
- !SSL_in_false_start(ssl) &&
- !(SSL_is_server(ssl) && SSL_in_early_data(ssl))) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_HANDSHAKE_NOT_COMPLETE);
- return 0;
- }
-
- if (ssl_protocol_version(ssl) >= TLS1_3_VERSION) {
- if (!use_context) {
- context = nullptr;
- context_len = 0;
- }
- return tls13_export_keying_material(
- ssl, MakeSpan(out, out_len),
- MakeConstSpan(ssl->s3->exporter_secret, ssl->s3->exporter_secret_len),
- MakeConstSpan(label, label_len), MakeConstSpan(context, context_len));
- }
-
- size_t seed_len = 2 * SSL3_RANDOM_SIZE;
- if (use_context) {
- if (context_len >= 1u << 16) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return 0;
- }
- seed_len += 2 + context_len;
- }
- Array<uint8_t> seed;
- if (!seed.Init(seed_len)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return 0;
- }
-
- OPENSSL_memcpy(seed.data(), ssl->s3->client_random, SSL3_RANDOM_SIZE);
- OPENSSL_memcpy(seed.data() + SSL3_RANDOM_SIZE, ssl->s3->server_random,
- SSL3_RANDOM_SIZE);
- if (use_context) {
- seed[2 * SSL3_RANDOM_SIZE] = static_cast<uint8_t>(context_len >> 8);
- seed[2 * SSL3_RANDOM_SIZE + 1] = static_cast<uint8_t>(context_len);
- OPENSSL_memcpy(seed.data() + 2 * SSL3_RANDOM_SIZE + 2, context, context_len);
- }
-
- const SSL_SESSION *session = SSL_get_session(ssl);
- const EVP_MD *digest = ssl_session_get_digest(session);
- return tls1_prf(
- digest, MakeSpan(out, out_len),
- MakeConstSpan(session->master_key, session->master_key_length),
- MakeConstSpan(label, label_len), seed, {});
- }
-
- int SSL_export_early_keying_material(
- SSL *ssl, uint8_t *out, size_t out_len, const char *label, size_t label_len,
- const uint8_t *context, size_t context_len) {
- if (!SSL_in_early_data(ssl) &&
- (!ssl->s3->have_version ||
- ssl_protocol_version(ssl) < TLS1_3_VERSION)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SSL_VERSION);
- return 0;
- }
-
- // The early exporter only exists if we accepted early data or offered it as
- // a client.
- if (!SSL_in_early_data(ssl) && !SSL_early_data_accepted(ssl)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_EARLY_DATA_NOT_IN_USE);
- return 0;
- }
-
- return tls13_export_keying_material(
- ssl, MakeSpan(out, out_len),
- MakeConstSpan(ssl->s3->early_exporter_secret,
- ssl->s3->early_exporter_secret_len),
- MakeConstSpan(label, label_len), MakeConstSpan(context, context_len));
- }
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