/* 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_grpc/ssl.h> #include <assert.h> #include <string.h> #include <utility> #include <openssl_grpc/err.h> #include <openssl_grpc/evp.h> #include <openssl_grpc/hmac.h> #include <openssl_grpc/md5.h> #include <openssl_grpc/mem.h> #include <openssl_grpc/nid.h> #include <openssl_grpc/rand.h> #include "../crypto/fipsmodule/tls/internal.h" #include "../crypto/internal.h" #include "internal.h" BSSL_NAMESPACE_BEGIN 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; } static bool generate_key_block(const SSL *ssl, Span<uint8_t> out, const SSL_SESSION *session) { auto secret = MakeConstSpan(session->secret, session->secret_length); static const char kLabel[] = "key expansion"; auto label = MakeConstSpan(kLabel, sizeof(kLabel) - 1); const EVP_MD *digest = ssl_session_get_digest(session); // Note this function assumes that |session|'s key material corresponds to // |ssl->s3->client_random| and |ssl->s3->server_random|. return tls1_prf(digest, out, secret, label, ssl->s3->server_random, ssl->s3->client_random); } bool tls1_configure_aead(SSL *ssl, evp_aead_direction_t direction, Array<uint8_t> *key_block_cache, const SSL_SESSION *session, 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, session->cipher)) { return false; } // 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) || !generate_key_block(ssl, MakeSpan(*key_block_cache), session)) { return false; } } 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 false; } iv = iv_override; } UniquePtr<SSLAEADContext> aead_ctx = SSLAEADContext::Create(direction, ssl->version, SSL_is_dtls(ssl), session->cipher, key, mac_secret, iv); if (!aead_ctx) { return false; } if (direction == evp_aead_open) { return ssl->method->set_read_state(ssl, ssl_encryption_application, std::move(aead_ctx), /*secret_for_quic=*/{}); } return ssl->method->set_write_state(ssl, ssl_encryption_application, std::move(aead_ctx), /*secret_for_quic=*/{}); } bool tls1_change_cipher_state(SSL_HANDSHAKE *hs, evp_aead_direction_t direction) { return tls1_configure_aead(hs->ssl, direction, &hs->key_block, ssl_handshake_session(hs), {}); } 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; } BSSL_NAMESPACE_END using namespace bssl; size_t SSL_get_key_block_len(const SSL *ssl) { // See |SSL_generate_key_block|. if (SSL_in_init(ssl)) { return 0; } 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) { // Which cipher state to use is ambiguous during a handshake. In particular, // there are points where read and write states are from different epochs. // During a handshake, before ChangeCipherSpec, the encryption states may not // match |ssl->s3->client_random| and |ssl->s3->server_random|. if (SSL_in_init(ssl)) { OPENSSL_PUT_ERROR(SSL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); return 0; } return generate_key_block(ssl, MakeSpan(out, out_len), SSL_get_session(ssl)); } 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->secret, session->secret_length), MakeConstSpan(label, label_len), seed, {}); }