1d64afda44
This was needed because ssl3_get_message would get confused if init_num were not set back to zero when reading the next message. However, ssl3_get_message now treats init_num only as an output, not an input. (The message sending logic and the individual handshake states still use it, so we can't get rid of it altogether yet.) I've kept the init_num reset at the start and end of the handshake loop alone for now since that's more about initialization and cleanup. Though I believe they too do not do anything. Change-Id: I64bbdd82122498de32364e7edb3b00b166059ecd Reviewed-on: https://boringssl-review.googlesource.com/7950 Reviewed-by: Adam Langley <agl@google.com>
518 lines
16 KiB
C
518 lines
16 KiB
C
/*
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* DTLS implementation written by Nagendra Modadugu
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2007 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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/* 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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#include <openssl/ssl.h>
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#include <assert.h>
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#include <string.h>
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#include <openssl/bn.h>
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#include <openssl/buf.h>
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#include <openssl/dh.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/md5.h>
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#include <openssl/mem.h>
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#include <openssl/rand.h>
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#include "internal.h"
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static int dtls1_get_hello_verify(SSL *ssl);
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int dtls1_connect(SSL *ssl) {
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BUF_MEM *buf = NULL;
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void (*cb)(const SSL *ssl, int type, int value) = NULL;
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int ret = -1;
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int new_state, state, skip = 0;
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assert(ssl->handshake_func == dtls1_connect);
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assert(!ssl->server);
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assert(SSL_IS_DTLS(ssl));
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ERR_clear_system_error();
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if (ssl->info_callback != NULL) {
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cb = ssl->info_callback;
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} else if (ssl->ctx->info_callback != NULL) {
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cb = ssl->ctx->info_callback;
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}
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for (;;) {
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state = ssl->state;
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switch (ssl->state) {
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case SSL_ST_CONNECT:
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if (cb != NULL) {
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cb(ssl, SSL_CB_HANDSHAKE_START, 1);
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}
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if (ssl->init_buf == NULL) {
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buf = BUF_MEM_new();
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if (buf == NULL ||
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!BUF_MEM_reserve(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
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ret = -1;
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goto end;
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}
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ssl->init_buf = buf;
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buf = NULL;
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}
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ssl->init_num = 0;
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if (!ssl_init_wbio_buffer(ssl)) {
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ret = -1;
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goto end;
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}
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ssl->state = SSL3_ST_CW_CLNT_HELLO_A;
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ssl->d1->send_cookie = 0;
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ssl->hit = 0;
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break;
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case SSL3_ST_CW_CLNT_HELLO_A:
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case SSL3_ST_CW_CLNT_HELLO_B:
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dtls1_start_timer(ssl);
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ret = ssl3_send_client_hello(ssl);
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if (ret <= 0) {
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goto end;
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}
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if (ssl->d1->send_cookie) {
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ssl->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
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} else {
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ssl->s3->tmp.next_state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
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}
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ssl->state = SSL3_ST_CW_FLUSH;
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break;
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case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
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ret = dtls1_get_hello_verify(ssl);
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if (ret <= 0) {
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goto end;
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}
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if (ssl->d1->send_cookie) {
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/* start again, with a cookie */
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dtls1_stop_timer(ssl);
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ssl->state = SSL3_ST_CW_CLNT_HELLO_A;
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} else {
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ssl->state = SSL3_ST_CR_SRVR_HELLO_A;
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}
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break;
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case SSL3_ST_CR_SRVR_HELLO_A:
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ret = ssl3_get_server_hello(ssl);
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if (ret <= 0) {
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goto end;
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}
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if (ssl->hit) {
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ssl->state = SSL3_ST_CR_CHANGE;
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if (ssl->tlsext_ticket_expected) {
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/* receive renewed session ticket */
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ssl->state = SSL3_ST_CR_SESSION_TICKET_A;
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}
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} else {
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ssl->state = SSL3_ST_CR_CERT_A;
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}
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break;
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case SSL3_ST_CR_CERT_A:
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if (ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) {
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ret = ssl3_get_server_certificate(ssl);
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if (ret <= 0) {
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goto end;
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}
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if (ssl->s3->tmp.certificate_status_expected) {
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ssl->state = SSL3_ST_CR_CERT_STATUS_A;
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} else {
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ssl->state = SSL3_ST_VERIFY_SERVER_CERT;
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}
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} else {
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skip = 1;
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ssl->state = SSL3_ST_CR_KEY_EXCH_A;
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}
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break;
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case SSL3_ST_VERIFY_SERVER_CERT:
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ret = ssl3_verify_server_cert(ssl);
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if (ret <= 0) {
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goto end;
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}
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ssl->state = SSL3_ST_CR_KEY_EXCH_A;
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break;
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case SSL3_ST_CR_KEY_EXCH_A:
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ret = ssl3_get_server_key_exchange(ssl);
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if (ret <= 0) {
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goto end;
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}
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if (ssl_cipher_uses_certificate_auth(ssl->s3->tmp.new_cipher)) {
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ssl->state = SSL3_ST_CR_CERT_REQ_A;
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} else {
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ssl->state = SSL3_ST_CR_SRVR_DONE_A;
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}
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break;
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case SSL3_ST_CR_CERT_REQ_A:
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ret = ssl3_get_certificate_request(ssl);
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if (ret <= 0) {
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goto end;
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}
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ssl->state = SSL3_ST_CR_SRVR_DONE_A;
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break;
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case SSL3_ST_CR_SRVR_DONE_A:
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ret = ssl3_get_server_done(ssl);
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if (ret <= 0) {
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goto end;
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}
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dtls1_stop_timer(ssl);
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if (ssl->s3->tmp.cert_req) {
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ssl->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
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} else {
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ssl->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
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}
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ssl->state = ssl->s3->tmp.next_state;
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break;
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case SSL3_ST_CW_CERT_A:
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case SSL3_ST_CW_CERT_B:
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case SSL3_ST_CW_CERT_C:
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case SSL3_ST_CW_CERT_D:
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dtls1_start_timer(ssl);
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ret = ssl3_send_client_certificate(ssl);
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if (ret <= 0) {
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goto end;
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}
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ssl->state = SSL3_ST_CW_KEY_EXCH_A;
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break;
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case SSL3_ST_CW_KEY_EXCH_A:
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case SSL3_ST_CW_KEY_EXCH_B:
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dtls1_start_timer(ssl);
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ret = ssl3_send_client_key_exchange(ssl);
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if (ret <= 0) {
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goto end;
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}
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/* For TLS, cert_req is set to 2, so a cert chain
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* of nothing is sent, but no verify packet is sent */
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if (ssl->s3->tmp.cert_req == 1) {
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ssl->state = SSL3_ST_CW_CERT_VRFY_A;
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} else {
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ssl->state = SSL3_ST_CW_CHANGE_A;
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}
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break;
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case SSL3_ST_CW_CERT_VRFY_A:
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case SSL3_ST_CW_CERT_VRFY_B:
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case SSL3_ST_CW_CERT_VRFY_C:
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dtls1_start_timer(ssl);
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ret = ssl3_send_cert_verify(ssl);
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if (ret <= 0) {
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goto end;
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}
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ssl->state = SSL3_ST_CW_CHANGE_A;
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break;
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case SSL3_ST_CW_CHANGE_A:
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case SSL3_ST_CW_CHANGE_B:
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if (!ssl->hit) {
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dtls1_start_timer(ssl);
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}
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ret = dtls1_send_change_cipher_spec(ssl, SSL3_ST_CW_CHANGE_A,
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SSL3_ST_CW_CHANGE_B);
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if (ret <= 0) {
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goto end;
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}
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ssl->state = SSL3_ST_CW_FINISHED_A;
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if (!tls1_change_cipher_state(ssl, SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
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ret = -1;
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goto end;
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}
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break;
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case SSL3_ST_CW_FINISHED_A:
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case SSL3_ST_CW_FINISHED_B:
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if (!ssl->hit) {
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dtls1_start_timer(ssl);
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}
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ret = ssl3_send_finished(ssl, SSL3_ST_CW_FINISHED_A,
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SSL3_ST_CW_FINISHED_B);
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if (ret <= 0) {
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goto end;
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}
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ssl->state = SSL3_ST_CW_FLUSH;
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if (ssl->hit) {
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ssl->s3->tmp.next_state = SSL_ST_OK;
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} else {
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/* Allow NewSessionTicket if ticket expected */
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if (ssl->tlsext_ticket_expected) {
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ssl->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
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} else {
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ssl->s3->tmp.next_state = SSL3_ST_CR_CHANGE;
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}
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}
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break;
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case SSL3_ST_CR_SESSION_TICKET_A:
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ret = ssl3_get_new_session_ticket(ssl);
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if (ret <= 0) {
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goto end;
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}
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ssl->state = SSL3_ST_CR_CHANGE;
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break;
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case SSL3_ST_CR_CERT_STATUS_A:
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ret = ssl3_get_cert_status(ssl);
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if (ret <= 0) {
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goto end;
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}
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ssl->state = SSL3_ST_VERIFY_SERVER_CERT;
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break;
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case SSL3_ST_CR_CHANGE:
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ret = ssl->method->ssl_read_change_cipher_spec(ssl);
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if (ret <= 0) {
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goto end;
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}
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if (!tls1_change_cipher_state(ssl, SSL3_CHANGE_CIPHER_CLIENT_READ)) {
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ret = -1;
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goto end;
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}
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ssl->state = SSL3_ST_CR_FINISHED_A;
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break;
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case SSL3_ST_CR_FINISHED_A:
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ret = ssl3_get_finished(ssl);
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if (ret <= 0) {
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goto end;
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}
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dtls1_stop_timer(ssl);
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if (ssl->hit) {
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ssl->state = SSL3_ST_CW_CHANGE_A;
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} else {
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ssl->state = SSL_ST_OK;
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}
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break;
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case SSL3_ST_CW_FLUSH:
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if (BIO_flush(ssl->wbio) <= 0) {
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ssl->rwstate = SSL_WRITING;
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ret = -1;
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goto end;
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}
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ssl->state = ssl->s3->tmp.next_state;
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break;
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case SSL_ST_OK:
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/* clean a few things up */
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ssl3_cleanup_key_block(ssl);
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/* Remove write buffering now. */
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ssl_free_wbio_buffer(ssl);
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ssl->init_num = 0;
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ssl->s3->initial_handshake_complete = 1;
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ssl_update_cache(ssl, SSL_SESS_CACHE_CLIENT);
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ret = 1;
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if (cb != NULL) {
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cb(ssl, SSL_CB_HANDSHAKE_DONE, 1);
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}
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|
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/* done with handshaking */
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ssl->d1->handshake_read_seq = 0;
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ssl->d1->next_handshake_write_seq = 0;
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goto end;
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|
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default:
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OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_STATE);
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ret = -1;
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goto end;
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}
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|
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/* did we do anything? */
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if (!ssl->s3->tmp.reuse_message && !skip) {
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if ((cb != NULL) && (ssl->state != state)) {
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new_state = ssl->state;
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ssl->state = state;
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cb(ssl, SSL_CB_CONNECT_LOOP, 1);
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ssl->state = new_state;
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}
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}
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skip = 0;
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}
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end:
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BUF_MEM_free(buf);
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if (cb != NULL) {
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cb(ssl, SSL_CB_CONNECT_EXIT, ret);
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}
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return ret;
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}
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static int dtls1_get_hello_verify(SSL *ssl) {
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long n;
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int al, ok = 0;
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CBS hello_verify_request, cookie;
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uint16_t server_version;
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n = ssl->method->ssl_get_message(ssl, -1, ssl_hash_message, &ok);
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if (!ok) {
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return n;
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}
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if (ssl->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
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ssl->d1->send_cookie = 0;
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ssl->s3->tmp.reuse_message = 1;
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return 1;
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}
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CBS_init(&hello_verify_request, ssl->init_msg, n);
|
|
|
|
if (!CBS_get_u16(&hello_verify_request, &server_version) ||
|
|
!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie) ||
|
|
CBS_len(&hello_verify_request) != 0) {
|
|
al = SSL_AD_DECODE_ERROR;
|
|
OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
|
|
goto f_err;
|
|
}
|
|
|
|
if (CBS_len(&cookie) > sizeof(ssl->d1->cookie)) {
|
|
al = SSL_AD_ILLEGAL_PARAMETER;
|
|
goto f_err;
|
|
}
|
|
|
|
memcpy(ssl->d1->cookie, CBS_data(&cookie), CBS_len(&cookie));
|
|
ssl->d1->cookie_len = CBS_len(&cookie);
|
|
|
|
ssl->d1->send_cookie = 1;
|
|
return 1;
|
|
|
|
f_err:
|
|
ssl3_send_alert(ssl, SSL3_AL_FATAL, al);
|
|
return -1;
|
|
}
|