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394 lines
10 KiB
394 lines
10 KiB
/* ssl/d1_lib.c */
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/*
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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) 1999-2005 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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#define USE_SOCKETS
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#include <openssl/objects.h>
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#include "ssl_locl.h"
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#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS)
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#include <sys/timeb.h>
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#endif
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static void get_current_time(struct timeval *t);
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const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
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int dtls1_listen(SSL *s, struct sockaddr *client);
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SSL3_ENC_METHOD DTLSv1_enc_data={
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dtls1_enc,
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tls1_mac,
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tls1_setup_key_block,
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tls1_generate_master_secret,
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tls1_change_cipher_state,
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tls1_final_finish_mac,
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TLS1_FINISH_MAC_LENGTH,
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tls1_cert_verify_mac,
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TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
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TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
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tls1_alert_code,
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};
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long dtls1_default_timeout(void)
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{
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/* 2 hours, the 24 hours mentioned in the DTLSv1 spec
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* is way too long for http, the cache would over fill */
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return(60*60*2);
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}
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int dtls1_new(SSL *s)
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{
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DTLS1_STATE *d1;
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if (!ssl3_new(s)) return(0);
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if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
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memset(d1,0, sizeof *d1);
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/* d1->handshake_epoch=0; */
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d1->unprocessed_rcds.q=pqueue_new();
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d1->processed_rcds.q=pqueue_new();
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d1->buffered_messages = pqueue_new();
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d1->sent_messages=pqueue_new();
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d1->buffered_app_data.q=pqueue_new();
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if ( s->server)
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{
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d1->cookie_len = sizeof(s->d1->cookie);
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}
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if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q
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|| ! d1->buffered_messages || ! d1->sent_messages || ! d1->buffered_app_data.q)
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{
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if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
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if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
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if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
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if ( d1->sent_messages) pqueue_free(d1->sent_messages);
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if ( d1->buffered_app_data.q) pqueue_free(d1->buffered_app_data.q);
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OPENSSL_free(d1);
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return (0);
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}
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s->d1=d1;
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s->method->ssl_clear(s);
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return(1);
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}
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void dtls1_free(SSL *s)
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{
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pitem *item = NULL;
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hm_fragment *frag = NULL;
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ssl3_free(s);
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while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
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{
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OPENSSL_free(item->data);
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pitem_free(item);
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}
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pqueue_free(s->d1->unprocessed_rcds.q);
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while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
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{
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OPENSSL_free(item->data);
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pitem_free(item);
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}
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pqueue_free(s->d1->processed_rcds.q);
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while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
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{
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frag = (hm_fragment *)item->data;
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OPENSSL_free(frag->fragment);
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OPENSSL_free(frag);
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pitem_free(item);
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}
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pqueue_free(s->d1->buffered_messages);
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while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
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{
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frag = (hm_fragment *)item->data;
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OPENSSL_free(frag->fragment);
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OPENSSL_free(frag);
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pitem_free(item);
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}
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pqueue_free(s->d1->sent_messages);
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while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL)
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{
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frag = (hm_fragment *)item->data;
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OPENSSL_free(frag->fragment);
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OPENSSL_free(frag);
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pitem_free(item);
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}
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pqueue_free(s->d1->buffered_app_data.q);
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OPENSSL_free(s->d1);
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}
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void dtls1_clear(SSL *s)
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{
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ssl3_clear(s);
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if (s->options & SSL_OP_CISCO_ANYCONNECT)
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s->version=DTLS1_BAD_VER;
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else
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s->version=DTLS1_VERSION;
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}
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long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
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{
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int ret=0;
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switch (cmd)
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{
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case DTLS_CTRL_GET_TIMEOUT:
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if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL)
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{
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ret = 1;
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}
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break;
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case DTLS_CTRL_HANDLE_TIMEOUT:
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ret = dtls1_handle_timeout(s);
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break;
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case DTLS_CTRL_LISTEN:
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ret = dtls1_listen(s, parg);
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break;
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default:
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ret = ssl3_ctrl(s, cmd, larg, parg);
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break;
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}
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return(ret);
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}
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/*
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* As it's impossible to use stream ciphers in "datagram" mode, this
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* simple filter is designed to disengage them in DTLS. Unfortunately
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* there is no universal way to identify stream SSL_CIPHER, so we have
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* to explicitly list their SSL_* codes. Currently RC4 is the only one
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* available, but if new ones emerge, they will have to be added...
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*/
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const SSL_CIPHER *dtls1_get_cipher(unsigned int u)
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{
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const SSL_CIPHER *ciph = ssl3_get_cipher(u);
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if (ciph != NULL)
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{
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if (ciph->algorithm_enc == SSL_RC4)
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return NULL;
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}
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return ciph;
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}
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void dtls1_start_timer(SSL *s)
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{
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/* If timer is not set, initialize duration with 1 second */
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if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
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{
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s->d1->timeout_duration = 1;
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}
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/* Set timeout to current time */
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get_current_time(&(s->d1->next_timeout));
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/* Add duration to current time */
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s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
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BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &(s->d1->next_timeout));
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}
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struct timeval* dtls1_get_timeout(SSL *s, struct timeval* timeleft)
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{
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struct timeval timenow;
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/* If no timeout is set, just return NULL */
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if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
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{
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return NULL;
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}
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/* Get current time */
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get_current_time(&timenow);
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/* If timer already expired, set remaining time to 0 */
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if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
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(s->d1->next_timeout.tv_sec == timenow.tv_sec &&
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s->d1->next_timeout.tv_usec <= timenow.tv_usec))
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{
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memset(timeleft, 0, sizeof(struct timeval));
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return timeleft;
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}
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/* Calculate time left until timer expires */
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memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
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timeleft->tv_sec -= timenow.tv_sec;
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timeleft->tv_usec -= timenow.tv_usec;
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if (timeleft->tv_usec < 0)
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{
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timeleft->tv_sec--;
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timeleft->tv_usec += 1000000;
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}
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/* If remaining time is less than 15 ms, set it to 0
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* to prevent issues because of small devergences with
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* socket timeouts.
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*/
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if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000)
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{
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memset(timeleft, 0, sizeof(struct timeval));
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}
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return timeleft;
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}
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int dtls1_is_timer_expired(SSL *s)
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{
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struct timeval timeleft;
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/* Get time left until timeout, return false if no timer running */
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if (dtls1_get_timeout(s, &timeleft) == NULL)
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{
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return 0;
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}
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/* Return false if timer is not expired yet */
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if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0)
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{
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return 0;
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}
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/* Timer expired, so return true */
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return 1;
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}
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void dtls1_double_timeout(SSL *s)
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{
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s->d1->timeout_duration *= 2;
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if (s->d1->timeout_duration > 60)
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s->d1->timeout_duration = 60;
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dtls1_start_timer(s);
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}
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void dtls1_stop_timer(SSL *s)
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{
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/* Reset everything */
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memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
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s->d1->timeout_duration = 1;
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BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &(s->d1->next_timeout));
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}
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int dtls1_handle_timeout(SSL *s)
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{
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DTLS1_STATE *state;
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/* if no timer is expired, don't do anything */
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if (!dtls1_is_timer_expired(s))
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{
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return 0;
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}
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dtls1_double_timeout(s);
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state = s->d1;
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state->timeout.num_alerts++;
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if ( state->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
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{
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/* fail the connection, enough alerts have been sent */
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SSLerr(SSL_F_DTLS1_HANDLE_TIMEOUT,SSL_R_READ_TIMEOUT_EXPIRED);
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return 0;
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}
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state->timeout.read_timeouts++;
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if ( state->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
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{
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state->timeout.read_timeouts = 1;
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}
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dtls1_start_timer(s);
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return dtls1_retransmit_buffered_messages(s);
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}
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static void get_current_time(struct timeval *t)
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{
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#ifdef OPENSSL_SYS_WIN32
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struct _timeb tb;
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_ftime(&tb);
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t->tv_sec = (long)tb.time;
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t->tv_usec = (long)tb.millitm * 1000;
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#elif defined(OPENSSL_SYS_VMS)
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struct timeb tb;
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ftime(&tb);
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t->tv_sec = (long)tb.time;
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t->tv_usec = (long)tb.millitm * 1000;
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#else
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gettimeofday(t, NULL);
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#endif
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}
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int dtls1_listen(SSL *s, struct sockaddr *client)
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{
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int ret;
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SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
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s->d1->listen = 1;
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ret = SSL_accept(s);
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if (ret <= 0) return ret;
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(void) BIO_dgram_get_peer(SSL_get_rbio(s), client);
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return 1;
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}
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