589 lines
17 KiB
C
589 lines
17 KiB
C
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/* 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_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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static void dtls1_set_handshake_header(SSL *s, int type, unsigned long len);
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static int dtls1_handshake_write(SSL *s);
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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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tls1_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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tls1_export_keying_material,
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SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV,
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DTLS1_HM_HEADER_LENGTH,
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dtls1_set_handshake_header,
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dtls1_handshake_write
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};
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SSL3_ENC_METHOD DTLSv1_2_enc_data = {
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tls1_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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tls1_export_keying_material,
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SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS
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| SSL_ENC_FLAG_SHA256_PRF | SSL_ENC_FLAG_TLS1_2_CIPHERS,
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DTLS1_HM_HEADER_LENGTH,
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dtls1_set_handshake_header,
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dtls1_handshake_write
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};
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long dtls1_default_timeout(void)
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{
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/*
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* 2 hours, the 24 hours mentioned in the DTLSv1 spec is way too long for
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* http, the cache would over fill
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*/
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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))
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return (0);
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if ((d1 = OPENSSL_malloc(sizeof(*d1))) == NULL)
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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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d1->cookie_len = sizeof(s->d1->cookie);
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}
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d1->link_mtu = 0;
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d1->mtu = 0;
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if (!d1->unprocessed_rcds.q || !d1->processed_rcds.q
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|| !d1->buffered_messages || !d1->sent_messages
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|| !d1->buffered_app_data.q) {
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if (d1->unprocessed_rcds.q)
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pqueue_free(d1->unprocessed_rcds.q);
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if (d1->processed_rcds.q)
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pqueue_free(d1->processed_rcds.q);
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if (d1->buffered_messages)
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pqueue_free(d1->buffered_messages);
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if (d1->sent_messages)
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pqueue_free(d1->sent_messages);
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if (d1->buffered_app_data.q)
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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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static void dtls1_clear_queues(SSL *s)
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{
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pitem *item = NULL;
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DTLS1_RECORD_DATA *rdata;
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while ((item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) {
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rdata = (DTLS1_RECORD_DATA *)item->data;
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if (rdata->rbuf.buf) {
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OPENSSL_free(rdata->rbuf.buf);
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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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while ((item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) {
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rdata = (DTLS1_RECORD_DATA *)item->data;
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if (rdata->rbuf.buf) {
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OPENSSL_free(rdata->rbuf.buf);
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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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while ((item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) {
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rdata = (DTLS1_RECORD_DATA *)item->data;
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if (rdata->rbuf.buf) {
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OPENSSL_free(rdata->rbuf.buf);
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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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dtls1_clear_received_buffer(s);
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dtls1_clear_sent_buffer(s);
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}
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void dtls1_clear_received_buffer(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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while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) {
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frag = (hm_fragment *)item->data;
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dtls1_hm_fragment_free(frag);
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pitem_free(item);
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}
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}
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void dtls1_clear_sent_buffer(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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while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
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frag = (hm_fragment *)item->data;
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dtls1_hm_fragment_free(frag);
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pitem_free(item);
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}
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}
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void dtls1_free(SSL *s)
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{
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ssl3_free(s);
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dtls1_clear_queues(s);
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pqueue_free(s->d1->unprocessed_rcds.q);
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pqueue_free(s->d1->processed_rcds.q);
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pqueue_free(s->d1->buffered_messages);
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pqueue_free(s->d1->sent_messages);
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pqueue_free(s->d1->buffered_app_data.q);
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OPENSSL_free(s->d1);
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s->d1 = NULL;
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}
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void dtls1_clear(SSL *s)
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{
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pqueue unprocessed_rcds;
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pqueue processed_rcds;
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pqueue buffered_messages;
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pqueue sent_messages;
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pqueue buffered_app_data;
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unsigned int mtu;
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unsigned int link_mtu;
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if (s->d1) {
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unprocessed_rcds = s->d1->unprocessed_rcds.q;
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processed_rcds = s->d1->processed_rcds.q;
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buffered_messages = s->d1->buffered_messages;
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sent_messages = s->d1->sent_messages;
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buffered_app_data = s->d1->buffered_app_data.q;
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mtu = s->d1->mtu;
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link_mtu = s->d1->link_mtu;
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dtls1_clear_queues(s);
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memset(s->d1, 0, sizeof(*(s->d1)));
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if (s->server) {
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s->d1->cookie_len = sizeof(s->d1->cookie);
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}
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if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
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s->d1->mtu = mtu;
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s->d1->link_mtu = link_mtu;
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}
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s->d1->unprocessed_rcds.q = unprocessed_rcds;
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s->d1->processed_rcds.q = processed_rcds;
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s->d1->buffered_messages = buffered_messages;
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s->d1->sent_messages = sent_messages;
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s->d1->buffered_app_data.q = buffered_app_data;
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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->client_version = s->version = DTLS1_BAD_VER;
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else if (s->method->version == DTLS_ANY_VERSION)
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s->version = DTLS1_2_VERSION;
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else
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s->version = s->method->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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case DTLS_CTRL_GET_TIMEOUT:
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if (dtls1_get_timeout(s, (struct timeval *)parg) != NULL) {
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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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case SSL_CTRL_CHECK_PROTO_VERSION:
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/*
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* For library-internal use; checks that the current protocol is the
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* highest enabled version (according to s->ctx->method, as version
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* negotiation may have changed s->method).
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*/
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if (s->version == s->ctx->method->version)
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return 1;
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/*
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* Apparently we're using a version-flexible SSL_METHOD (not at its
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* highest protocol version).
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*/
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if (s->ctx->method->version == DTLS_method()->version) {
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#if DTLS_MAX_VERSION != DTLS1_2_VERSION
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# error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION.
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#endif
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if (!(s->options & SSL_OP_NO_DTLSv1_2))
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return s->version == DTLS1_2_VERSION;
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if (!(s->options & SSL_OP_NO_DTLSv1))
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return s->version == DTLS1_VERSION;
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}
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return 0; /* Unexpected state; fail closed. */
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case DTLS_CTRL_SET_LINK_MTU:
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if (larg < (long)dtls1_link_min_mtu())
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return 0;
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s->d1->link_mtu = larg;
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return 1;
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case DTLS_CTRL_GET_LINK_MIN_MTU:
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return (long)dtls1_link_min_mtu();
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case SSL_CTRL_SET_MTU:
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/*
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* We may not have a BIO set yet so can't call dtls1_min_mtu()
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* We'll have to make do with dtls1_link_min_mtu() and max overhead
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*/
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if (larg < (long)dtls1_link_min_mtu() - DTLS1_MAX_MTU_OVERHEAD)
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return 0;
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s->d1->mtu = larg;
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return larg;
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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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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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#ifndef OPENSSL_NO_SCTP
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/* Disable timer for SCTP */
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if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
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memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
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return;
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}
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#endif
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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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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,
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&(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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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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||
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if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
|
||
|
(s->d1->next_timeout.tv_sec == timenow.tv_sec &&
|
||
|
s->d1->next_timeout.tv_usec <= timenow.tv_usec)) {
|
||
|
memset(timeleft, 0, sizeof(struct timeval));
|
||
|
return timeleft;
|
||
|
}
|
||
|
|
||
|
/* Calculate time left until timer expires */
|
||
|
memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
|
||
|
timeleft->tv_sec -= timenow.tv_sec;
|
||
|
timeleft->tv_usec -= timenow.tv_usec;
|
||
|
if (timeleft->tv_usec < 0) {
|
||
|
timeleft->tv_sec--;
|
||
|
timeleft->tv_usec += 1000000;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* If remaining time is less than 15 ms, set it to 0 to prevent issues
|
||
|
* because of small devergences with socket timeouts.
|
||
|
*/
|
||
|
if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) {
|
||
|
memset(timeleft, 0, sizeof(struct timeval));
|
||
|
}
|
||
|
|
||
|
return timeleft;
|
||
|
}
|
||
|
|
||
|
int dtls1_is_timer_expired(SSL *s)
|
||
|
{
|
||
|
struct timeval timeleft;
|
||
|
|
||
|
/* Get time left until timeout, return false if no timer running */
|
||
|
if (dtls1_get_timeout(s, &timeleft) == NULL) {
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* Return false if timer is not expired yet */
|
||
|
if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) {
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* Timer expired, so return true */
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
void dtls1_double_timeout(SSL *s)
|
||
|
{
|
||
|
s->d1->timeout_duration *= 2;
|
||
|
if (s->d1->timeout_duration > 60)
|
||
|
s->d1->timeout_duration = 60;
|
||
|
dtls1_start_timer(s);
|
||
|
}
|
||
|
|
||
|
void dtls1_stop_timer(SSL *s)
|
||
|
{
|
||
|
/* Reset everything */
|
||
|
memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st));
|
||
|
memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
|
||
|
s->d1->timeout_duration = 1;
|
||
|
BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
|
||
|
&(s->d1->next_timeout));
|
||
|
/* Clear retransmission buffer */
|
||
|
dtls1_clear_sent_buffer(s);
|
||
|
}
|
||
|
|
||
|
int dtls1_check_timeout_num(SSL *s)
|
||
|
{
|
||
|
unsigned int mtu;
|
||
|
|
||
|
s->d1->timeout.num_alerts++;
|
||
|
|
||
|
/* Reduce MTU after 2 unsuccessful retransmissions */
|
||
|
if (s->d1->timeout.num_alerts > 2
|
||
|
&& !(SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) {
|
||
|
mtu =
|
||
|
BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0,
|
||
|
NULL);
|
||
|
if (mtu < s->d1->mtu)
|
||
|
s->d1->mtu = mtu;
|
||
|
}
|
||
|
|
||
|
if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
|
||
|
/* fail the connection, enough alerts have been sent */
|
||
|
SSLerr(SSL_F_DTLS1_CHECK_TIMEOUT_NUM, SSL_R_READ_TIMEOUT_EXPIRED);
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int dtls1_handle_timeout(SSL *s)
|
||
|
{
|
||
|
/* if no timer is expired, don't do anything */
|
||
|
if (!dtls1_is_timer_expired(s)) {
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
dtls1_double_timeout(s);
|
||
|
|
||
|
if (dtls1_check_timeout_num(s) < 0)
|
||
|
return -1;
|
||
|
|
||
|
s->d1->timeout.read_timeouts++;
|
||
|
if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
|
||
|
s->d1->timeout.read_timeouts = 1;
|
||
|
}
|
||
|
#ifndef OPENSSL_NO_HEARTBEATS
|
||
|
if (s->tlsext_hb_pending) {
|
||
|
s->tlsext_hb_pending = 0;
|
||
|
return dtls1_heartbeat(s);
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
dtls1_start_timer(s);
|
||
|
return dtls1_retransmit_buffered_messages(s);
|
||
|
}
|
||
|
|
||
|
static void get_current_time(struct timeval *t)
|
||
|
{
|
||
|
#if defined(_WIN32)
|
||
|
SYSTEMTIME st;
|
||
|
union {
|
||
|
unsigned __int64 ul;
|
||
|
FILETIME ft;
|
||
|
} now;
|
||
|
|
||
|
GetSystemTime(&st);
|
||
|
SystemTimeToFileTime(&st, &now.ft);
|
||
|
# ifdef __MINGW32__
|
||
|
now.ul -= 116444736000000000ULL;
|
||
|
# else
|
||
|
now.ul -= 116444736000000000UI64; /* re-bias to 1/1/1970 */
|
||
|
# endif
|
||
|
t->tv_sec = (long)(now.ul / 10000000);
|
||
|
t->tv_usec = ((int)(now.ul % 10000000)) / 10;
|
||
|
#elif defined(OPENSSL_SYS_VMS)
|
||
|
struct timeb tb;
|
||
|
ftime(&tb);
|
||
|
t->tv_sec = (long)tb.time;
|
||
|
t->tv_usec = (long)tb.millitm * 1000;
|
||
|
#else
|
||
|
gettimeofday(t, NULL);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
int dtls1_listen(SSL *s, struct sockaddr *client)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
/* Ensure there is no state left over from a previous invocation */
|
||
|
SSL_clear(s);
|
||
|
|
||
|
SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
|
||
|
s->d1->listen = 1;
|
||
|
|
||
|
ret = SSL_accept(s);
|
||
|
if (ret <= 0)
|
||
|
return ret;
|
||
|
|
||
|
(void)BIO_dgram_get_peer(SSL_get_rbio(s), client);
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
static void dtls1_set_handshake_header(SSL *s, int htype, unsigned long len)
|
||
|
{
|
||
|
unsigned char *p = (unsigned char *)s->init_buf->data;
|
||
|
dtls1_set_message_header(s, p, htype, len, 0, len);
|
||
|
s->init_num = (int)len + DTLS1_HM_HEADER_LENGTH;
|
||
|
s->init_off = 0;
|
||
|
/* Buffer the message to handle re-xmits */
|
||
|
dtls1_buffer_message(s, 0);
|
||
|
}
|
||
|
|
||
|
static int dtls1_handshake_write(SSL *s)
|
||
|
{
|
||
|
return dtls1_do_write(s, SSL3_RT_HANDSHAKE);
|
||
|
}
|