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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 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
- *
- * Portions of the attached software ("Contribution") are developed by
- * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
- *
- * The Contribution is licensed pursuant to the OpenSSL open source
- * license provided above.
- *
- * ECC cipher suite support in OpenSSL originally written by
- * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
- *
- */
- /* ====================================================================
- * 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 <openssl/buf.h>
- #include <openssl/dh.h>
- #include <openssl/digest.h>
- #include <openssl/err.h>
- #include <openssl/md5.h>
- #include <openssl/mem.h>
- #include <openssl/nid.h>
-
- #include "internal.h"
-
-
- int ssl3_supports_cipher(const SSL_CIPHER *cipher) {
- return 1;
- }
-
- void ssl3_expect_flight(SSL *ssl) {}
-
- void ssl3_received_flight(SSL *ssl) {}
-
- int ssl3_new(SSL *ssl) {
- SSL3_STATE *s3;
-
- s3 = OPENSSL_malloc(sizeof *s3);
- if (s3 == NULL) {
- goto err;
- }
- memset(s3, 0, sizeof *s3);
-
- EVP_MD_CTX_init(&s3->handshake_hash);
- EVP_MD_CTX_init(&s3->handshake_md5);
-
- ssl->s3 = s3;
-
- /* Set the version to the highest supported version.
- *
- * TODO(davidben): Move this field into |s3|, have it store the normalized
- * protocol version, and implement this pre-negotiation quirk in |SSL_version|
- * at the API boundary rather than in internal state. */
- ssl->version = TLS1_2_VERSION;
- return 1;
- err:
- return 0;
- }
-
- void ssl3_free(SSL *ssl) {
- if (ssl == NULL || ssl->s3 == NULL) {
- return;
- }
-
- ssl3_cleanup_key_block(ssl);
- ssl_read_buffer_clear(ssl);
- ssl_write_buffer_clear(ssl);
- SSL_ECDH_CTX_cleanup(&ssl->s3->tmp.ecdh_ctx);
- OPENSSL_free(ssl->s3->tmp.peer_key);
- OPENSSL_free(ssl->s3->tmp.server_params);
-
- sk_X509_NAME_pop_free(ssl->s3->tmp.ca_names, X509_NAME_free);
- OPENSSL_free(ssl->s3->tmp.certificate_types);
- OPENSSL_free(ssl->s3->tmp.peer_supported_group_list);
- OPENSSL_free(ssl->s3->tmp.peer_psk_identity_hint);
- SSL_SESSION_free(ssl->s3->new_session);
- SSL_SESSION_free(ssl->s3->established_session);
- ssl3_free_handshake_buffer(ssl);
- ssl3_free_handshake_hash(ssl);
- ssl_handshake_free(ssl->s3->hs);
- OPENSSL_free(ssl->s3->next_proto_negotiated);
- OPENSSL_free(ssl->s3->alpn_selected);
- SSL_AEAD_CTX_free(ssl->s3->aead_read_ctx);
- SSL_AEAD_CTX_free(ssl->s3->aead_write_ctx);
- OPENSSL_free(ssl->s3->pending_message);
-
- OPENSSL_cleanse(ssl->s3, sizeof *ssl->s3);
- OPENSSL_free(ssl->s3);
- ssl->s3 = NULL;
- }
-
- struct ssl_cipher_preference_list_st *ssl_get_cipher_preferences(SSL *ssl) {
- if (ssl->cipher_list != NULL) {
- return ssl->cipher_list;
- }
-
- if (ssl->version >= TLS1_1_VERSION && ssl->ctx->cipher_list_tls11 != NULL) {
- return ssl->ctx->cipher_list_tls11;
- }
-
- if (ssl->version >= TLS1_VERSION && ssl->ctx->cipher_list_tls10 != NULL) {
- return ssl->ctx->cipher_list_tls10;
- }
-
- if (ssl->ctx->cipher_list != NULL) {
- return ssl->ctx->cipher_list;
- }
-
- return NULL;
- }
-
- const SSL_CIPHER *ssl3_choose_cipher(
- SSL *ssl, const struct ssl_early_callback_ctx *client_hello,
- const struct ssl_cipher_preference_list_st *server_pref) {
- const SSL_CIPHER *c, *ret = NULL;
- STACK_OF(SSL_CIPHER) *srvr = server_pref->ciphers, *prio, *allow;
- size_t i;
- int ok;
- size_t cipher_index;
- uint32_t alg_k, alg_a, mask_k, mask_a;
- /* in_group_flags will either be NULL, or will point to an array of bytes
- * which indicate equal-preference groups in the |prio| stack. See the
- * comment about |in_group_flags| in the |ssl_cipher_preference_list_st|
- * struct. */
- const uint8_t *in_group_flags;
- /* group_min contains the minimal index so far found in a group, or -1 if no
- * such value exists yet. */
- int group_min = -1;
-
- STACK_OF(SSL_CIPHER) *clnt = ssl_parse_client_cipher_list(client_hello);
- if (clnt == NULL) {
- return NULL;
- }
-
- if (ssl->options & SSL_OP_CIPHER_SERVER_PREFERENCE) {
- prio = srvr;
- in_group_flags = server_pref->in_group_flags;
- allow = clnt;
- } else {
- prio = clnt;
- in_group_flags = NULL;
- allow = srvr;
- }
-
- ssl_get_compatible_server_ciphers(ssl, &mask_k, &mask_a);
-
- for (i = 0; i < sk_SSL_CIPHER_num(prio); i++) {
- c = sk_SSL_CIPHER_value(prio, i);
-
- ok = 1;
-
- /* Check the TLS version. */
- if (SSL_CIPHER_get_min_version(c) > ssl3_protocol_version(ssl) ||
- SSL_CIPHER_get_max_version(c) < ssl3_protocol_version(ssl)) {
- ok = 0;
- }
-
- alg_k = c->algorithm_mkey;
- alg_a = c->algorithm_auth;
-
- ok = ok && (alg_k & mask_k) && (alg_a & mask_a);
-
- if (ok && sk_SSL_CIPHER_find(allow, &cipher_index, c)) {
- if (in_group_flags != NULL && in_group_flags[i] == 1) {
- /* This element of |prio| is in a group. Update the minimum index found
- * so far and continue looking. */
- if (group_min == -1 || (size_t)group_min > cipher_index) {
- group_min = cipher_index;
- }
- } else {
- if (group_min != -1 && (size_t)group_min < cipher_index) {
- cipher_index = group_min;
- }
- ret = sk_SSL_CIPHER_value(allow, cipher_index);
- break;
- }
- }
-
- if (in_group_flags != NULL && in_group_flags[i] == 0 && group_min != -1) {
- /* We are about to leave a group, but we found a match in it, so that's
- * our answer. */
- ret = sk_SSL_CIPHER_value(allow, group_min);
- break;
- }
- }
-
- sk_SSL_CIPHER_free(clnt);
- return ret;
- }
-
- /* If we are using default SHA1+MD5 algorithms switch to new SHA256 PRF and
- * handshake macs if required. */
- uint32_t ssl_get_algorithm_prf(const SSL *ssl) {
- uint32_t algorithm_prf = ssl->s3->tmp.new_cipher->algorithm_prf;
- if (algorithm_prf == SSL_HANDSHAKE_MAC_DEFAULT &&
- ssl3_protocol_version(ssl) >= TLS1_2_VERSION) {
- return SSL_HANDSHAKE_MAC_SHA256;
- }
- return algorithm_prf;
- }
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