585 lines
21 KiB
C
585 lines
21 KiB
C
/* ssl/s23_srvr.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "ssl_locl.h"
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#include <openssl/buffer.h>
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#include <openssl/rand.h>
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#include <openssl/objects.h>
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#include <openssl/evp.h>
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static const SSL_METHOD *ssl23_get_server_method(int ver);
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int ssl23_get_client_hello(SSL *s);
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static const SSL_METHOD *ssl23_get_server_method(int ver)
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{
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#ifndef OPENSSL_NO_SSL3
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if (ver == SSL3_VERSION)
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return (SSLv3_server_method());
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#endif
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if (ver == TLS1_VERSION)
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return (TLSv1_server_method());
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else if (ver == TLS1_1_VERSION)
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return (TLSv1_1_server_method());
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else if (ver == TLS1_2_VERSION)
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return (TLSv1_2_server_method());
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else
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return (NULL);
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}
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IMPLEMENT_ssl23_meth_func(SSLv23_server_method,
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ssl23_accept,
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ssl_undefined_function, ssl23_get_server_method)
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int ssl23_accept(SSL *s)
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{
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BUF_MEM *buf;
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unsigned long Time = (unsigned long)time(NULL);
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void (*cb) (const SSL *ssl, int type, int val) = NULL;
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int ret = -1;
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int new_state, state;
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RAND_add(&Time, sizeof(Time), 0);
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ERR_clear_error();
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clear_sys_error();
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if (s->info_callback != NULL)
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cb = s->info_callback;
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else if (s->ctx->info_callback != NULL)
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cb = s->ctx->info_callback;
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s->in_handshake++;
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if (!SSL_in_init(s) || SSL_in_before(s)) {
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if (!SSL_clear(s))
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return -1;
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}
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for (;;) {
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state = s->state;
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switch (s->state) {
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case SSL_ST_BEFORE:
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case SSL_ST_ACCEPT:
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case SSL_ST_BEFORE | SSL_ST_ACCEPT:
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case SSL_ST_OK | SSL_ST_ACCEPT:
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s->server = 1;
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if (cb != NULL)
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cb(s, SSL_CB_HANDSHAKE_START, 1);
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/* s->version=SSL3_VERSION; */
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s->type = SSL_ST_ACCEPT;
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if (s->init_buf == NULL) {
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if ((buf = BUF_MEM_new()) == NULL) {
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ret = -1;
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goto end;
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}
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if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
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BUF_MEM_free(buf);
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ret = -1;
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goto end;
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}
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s->init_buf = buf;
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}
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ssl3_init_finished_mac(s);
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s->state = SSL23_ST_SR_CLNT_HELLO_A;
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s->ctx->stats.sess_accept++;
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s->init_num = 0;
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break;
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case SSL23_ST_SR_CLNT_HELLO_A:
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case SSL23_ST_SR_CLNT_HELLO_B:
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s->shutdown = 0;
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ret = ssl23_get_client_hello(s);
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if (ret >= 0)
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cb = NULL;
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goto end;
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/* break; */
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default:
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SSLerr(SSL_F_SSL23_ACCEPT, SSL_R_UNKNOWN_STATE);
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ret = -1;
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goto end;
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/* break; */
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}
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if ((cb != NULL) && (s->state != state)) {
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new_state = s->state;
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s->state = state;
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cb(s, SSL_CB_ACCEPT_LOOP, 1);
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s->state = new_state;
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}
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}
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end:
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s->in_handshake--;
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if (cb != NULL)
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cb(s, SSL_CB_ACCEPT_EXIT, ret);
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return (ret);
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}
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int ssl23_get_client_hello(SSL *s)
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{
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/*-
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* Request this many bytes in initial read.
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* We can detect SSL 3.0/TLS 1.0 Client Hellos
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* ('type == 3') correctly only when the following
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* is in a single record, which is not guaranteed by
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* the protocol specification:
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* Byte Content
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* 0 type \
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* 1/2 version > record header
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* 3/4 length /
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* 5 msg_type \
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* 6-8 length > Client Hello message
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* 9/10 client_version /
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*/
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unsigned char buf_space[11];
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unsigned char *buf = &(buf_space[0]);
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unsigned char *p, *d, *d_len, *dd;
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unsigned int i;
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unsigned int csl, sil, cl;
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int n = 0, j;
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int type = 0;
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int v[2];
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if (s->state == SSL23_ST_SR_CLNT_HELLO_A) {
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/* read the initial header */
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v[0] = v[1] = 0;
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if (!ssl3_setup_buffers(s))
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goto err;
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n = ssl23_read_bytes(s, sizeof buf_space);
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if (n != sizeof buf_space)
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return (n); /* n == -1 || n == 0 */
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p = RECORD_LAYER_get_packet(&s->rlayer);
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memcpy(buf, p, n);
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if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {
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/*
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* SSLv2 header
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*/
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if ((p[3] == 0x00) && (p[4] == 0x02)) {
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v[0] = p[3];
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v[1] = p[4];
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/* SSLv2 */
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} else if (p[3] == SSL3_VERSION_MAJOR) {
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v[0] = p[3];
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v[1] = p[4];
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/* SSLv3/TLSv1 */
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if (p[4] >= TLS1_VERSION_MINOR) {
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if (p[4] >= TLS1_2_VERSION_MINOR &&
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!(s->options & SSL_OP_NO_TLSv1_2)) {
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s->version = TLS1_2_VERSION;
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s->state = SSL23_ST_SR_CLNT_HELLO_B;
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} else if (p[4] >= TLS1_1_VERSION_MINOR &&
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!(s->options & SSL_OP_NO_TLSv1_1)) {
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s->version = TLS1_1_VERSION;
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/*
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* type=2;
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*//*
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* done later to survive restarts
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*/
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s->state = SSL23_ST_SR_CLNT_HELLO_B;
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} else if (!(s->options & SSL_OP_NO_TLSv1)) {
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s->version = TLS1_VERSION;
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/*
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* type=2;
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*//*
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* done later to survive restarts
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*/
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s->state = SSL23_ST_SR_CLNT_HELLO_B;
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} else if (!(s->options & SSL_OP_NO_SSLv3)) {
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s->version = SSL3_VERSION;
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/* type=2; */
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s->state = SSL23_ST_SR_CLNT_HELLO_B;
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}
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} else if (!(s->options & SSL_OP_NO_SSLv3)) {
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s->version = SSL3_VERSION;
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/* type=2; */
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s->state = SSL23_ST_SR_CLNT_HELLO_B;
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}
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}
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}
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/* p[4] < 5 ... silly record length? */
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else if ((p[0] == SSL3_RT_HANDSHAKE) &&
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(p[1] == SSL3_VERSION_MAJOR) &&
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(p[5] == SSL3_MT_CLIENT_HELLO) && ((p[3] == 0 && p[4] < 5)
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|| (p[9] >= p[1]))) {
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/*
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* SSLv3 or tls1 header
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*/
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v[0] = p[1]; /* major version (= SSL3_VERSION_MAJOR) */
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/*
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* We must look at client_version inside the Client Hello message
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* to get the correct minor version. However if we have only a
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* pathologically small fragment of the Client Hello message, this
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* would be difficult, and we'd have to read more records to find
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* out. No known SSL 3.0 client fragments ClientHello like this,
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* so we simply reject such connections to avoid protocol version
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* downgrade attacks.
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*/
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if (p[3] == 0 && p[4] < 6) {
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_SMALL);
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goto err;
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}
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/*
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* if major version number > 3 set minor to a value which will
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* use the highest version 3 we support. If TLS 2.0 ever appears
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* we will need to revise this....
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*/
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if (p[9] > SSL3_VERSION_MAJOR)
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v[1] = 0xff;
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else
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v[1] = p[10]; /* minor version according to client_version */
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if (v[1] >= TLS1_VERSION_MINOR) {
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if (v[1] >= TLS1_2_VERSION_MINOR &&
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!(s->options & SSL_OP_NO_TLSv1_2)) {
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s->version = TLS1_2_VERSION;
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type = 3;
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} else if (v[1] >= TLS1_1_VERSION_MINOR &&
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!(s->options & SSL_OP_NO_TLSv1_1)) {
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s->version = TLS1_1_VERSION;
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type = 3;
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} else if (!(s->options & SSL_OP_NO_TLSv1)) {
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s->version = TLS1_VERSION;
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type = 3;
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} else if (!(s->options & SSL_OP_NO_SSLv3)) {
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s->version = SSL3_VERSION;
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type = 3;
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}
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} else {
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/* client requests SSL 3.0 */
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if (!(s->options & SSL_OP_NO_SSLv3)) {
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s->version = SSL3_VERSION;
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type = 3;
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} else if (!(s->options & SSL_OP_NO_TLSv1)) {
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/*
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* we won't be able to use TLS of course, but this will
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* send an appropriate alert
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*/
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s->version = TLS1_VERSION;
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type = 3;
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}
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}
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} else if ((strncmp("GET ", (char *)p, 4) == 0) ||
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(strncmp("POST ", (char *)p, 5) == 0) ||
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(strncmp("HEAD ", (char *)p, 5) == 0) ||
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(strncmp("PUT ", (char *)p, 4) == 0)) {
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTP_REQUEST);
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goto err;
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} else if (strncmp("CONNECT", (char *)p, 7) == 0) {
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTPS_PROXY_REQUEST);
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goto err;
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}
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}
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/* ensure that TLS_MAX_VERSION is up-to-date */
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OPENSSL_assert(s->version <= TLS_MAX_VERSION);
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if (s->version < TLS1_2_VERSION && tls1_suiteb(s)) {
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
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SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
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goto err;
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}
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if (FIPS_mode() && (s->version < TLS1_VERSION)) {
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
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SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
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goto err;
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}
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if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_VERSION_TOO_LOW);
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goto err;
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}
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if (s->state == SSL23_ST_SR_CLNT_HELLO_B) {
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/*
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* we have SSLv3/TLSv1 in an SSLv2 header (other cases skip this
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* state)
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*/
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type = 2;
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p = RECORD_LAYER_get_packet(&s->rlayer);
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v[0] = p[3]; /* == SSL3_VERSION_MAJOR */
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v[1] = p[4];
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/*-
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* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
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* header is sent directly on the wire, not wrapped as a TLS
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* record. It's format is:
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* Byte Content
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* 0-1 msg_length
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* 2 msg_type
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* 3-4 version
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* 5-6 cipher_spec_length
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* 7-8 session_id_length
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* 9-10 challenge_length
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* ... ...
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*/
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n = ((p[0] & 0x7f) << 8) | p[1];
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if (n > (1024 * 4)) {
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_LARGE);
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goto err;
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}
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if (n < 9) {
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SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
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SSL_R_RECORD_LENGTH_MISMATCH);
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goto err;
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}
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j = ssl23_read_bytes(s, n + 2);
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/*
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* We previously read 11 bytes, so if j > 0, we must have j == n+2 ==
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* s->packet_length. We have at least 11 valid packet bytes.
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*/
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if (j <= 0)
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return (j);
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ssl3_finish_mac(s, RECORD_LAYER_get_packet(&s->rlayer) + 2,
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RECORD_LAYER_get_packet_length(&s->rlayer) - 2);
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/* CLIENT-HELLO */
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if (s->msg_callback)
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s->msg_callback(0, SSL2_VERSION, 0,
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RECORD_LAYER_get_packet(&s->rlayer) + 2,
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RECORD_LAYER_get_packet_length(&s->rlayer) - 2, s,
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s->msg_callback_arg);
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p = RECORD_LAYER_get_packet(&s->rlayer);
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p += 5;
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n2s(p, csl);
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n2s(p, sil);
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n2s(p, cl);
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d = (unsigned char *)s->init_buf->data;
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if ((csl + sil + cl + 11)
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!= RECORD_LAYER_get_packet_length(&s->rlayer)) {
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/* We can't have TLS
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* extensions in SSL
|
|
* 2.0 format *
|
|
* Client Hello, can
|
|
* we? Error
|
|
* condition should
|
|
* be * '>'
|
|
* otherweise */
|
|
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
|
|
SSL_R_RECORD_LENGTH_MISMATCH);
|
|
goto err;
|
|
}
|
|
|
|
/* record header: msg_type ... */
|
|
*(d++) = SSL3_MT_CLIENT_HELLO;
|
|
/* ... and length (actual value will be written later) */
|
|
d_len = d;
|
|
d += 3;
|
|
|
|
/* client_version */
|
|
*(d++) = SSL3_VERSION_MAJOR; /* == v[0] */
|
|
*(d++) = v[1];
|
|
|
|
/* lets populate the random area */
|
|
/* get the challenge_length */
|
|
i = (cl > SSL3_RANDOM_SIZE) ? SSL3_RANDOM_SIZE : cl;
|
|
memset(d, 0, SSL3_RANDOM_SIZE);
|
|
memcpy(&(d[SSL3_RANDOM_SIZE - i]), &(p[csl + sil]), i);
|
|
d += SSL3_RANDOM_SIZE;
|
|
|
|
/* no session-id reuse */
|
|
*(d++) = 0;
|
|
|
|
/* ciphers */
|
|
j = 0;
|
|
dd = d;
|
|
d += 2;
|
|
for (i = 0; i < csl; i += 3) {
|
|
if (p[i] != 0)
|
|
continue;
|
|
*(d++) = p[i + 1];
|
|
*(d++) = p[i + 2];
|
|
j += 2;
|
|
}
|
|
s2n(j, dd);
|
|
|
|
/* COMPRESSION */
|
|
*(d++) = 1;
|
|
*(d++) = 0;
|
|
|
|
#if 0
|
|
/* copy any remaining data with may be extensions */
|
|
p = p + csl + sil + cl;
|
|
while (p < s->packet + s->packet_length) {
|
|
*(d++) = *(p++);
|
|
}
|
|
#endif
|
|
|
|
i = (d - (unsigned char *)s->init_buf->data) - 4;
|
|
l2n3((long)i, d_len);
|
|
|
|
/* get the data reused from the init_buf */
|
|
s->s3->tmp.reuse_message = 1;
|
|
s->s3->tmp.message_type = SSL3_MT_CLIENT_HELLO;
|
|
s->s3->tmp.message_size = i;
|
|
}
|
|
|
|
/* imaginary new state (for program structure): */
|
|
/* s->state = SSL23_SR_CLNT_HELLO_C */
|
|
|
|
if ((type == 2) || (type == 3)) {
|
|
/*
|
|
* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style)
|
|
*/
|
|
const SSL_METHOD *new_method;
|
|
new_method = ssl23_get_server_method(s->version);
|
|
if (new_method == NULL) {
|
|
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL);
|
|
goto err;
|
|
}
|
|
s->method = new_method;
|
|
|
|
if (!ssl_init_wbio_buffer(s, 1))
|
|
goto err;
|
|
|
|
/* we are in this state */
|
|
s->state = SSL3_ST_SR_CLNT_HELLO_A;
|
|
|
|
if (type == 3) {
|
|
/*
|
|
* put the 'n' bytes we have read into the input buffer for SSLv3
|
|
*/
|
|
if (!RECORD_LAYER_set_data(&s->rlayer, buf, n))
|
|
goto err;
|
|
} else {
|
|
if (!RECORD_LAYER_set_data(&s->rlayer, NULL, 0))
|
|
goto err;
|
|
}
|
|
s->handshake_func = s->method->ssl_accept;
|
|
} else {
|
|
/* bad, very bad */
|
|
SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
|
|
goto err;
|
|
}
|
|
s->init_num = 0;
|
|
|
|
if (buf != buf_space)
|
|
OPENSSL_free(buf);
|
|
return (SSL_accept(s));
|
|
err:
|
|
if (buf != buf_space)
|
|
OPENSSL_free(buf);
|
|
return (-1);
|
|
}
|