early-access version 1255
This commit is contained in:
pineappleEA
450
externals/libressl/ssl/d1_lib.c
vendored
Executable file
450
externals/libressl/ssl/d1_lib.c
vendored
Executable file
@@ -0,0 +1,450 @@
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/* $OpenBSD: d1_lib.c,v 1.50 2020/09/26 14:43:17 jsing Exp $ */
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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 <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <openssl/objects.h>
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#include "pqueue.h"
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#include "ssl_locl.h"
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void dtls1_hm_fragment_free(hm_fragment *frag);
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static int dtls1_listen(SSL *s, struct sockaddr *client);
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SSL3_ENC_METHOD DTLSv1_enc_data = {
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.enc_flags = SSL_ENC_FLAG_EXPLICIT_IV,
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};
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int
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dtls1_new(SSL *s)
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{
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if (!ssl3_new(s))
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goto err;
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if ((s->d1 = calloc(1, sizeof(*s->d1))) == NULL)
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goto err;
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if ((s->d1->internal = calloc(1, sizeof(*s->d1->internal))) == NULL)
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goto err;
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if ((s->d1->internal->unprocessed_rcds.q = pqueue_new()) == NULL)
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goto err;
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if ((s->d1->internal->processed_rcds.q = pqueue_new()) == NULL)
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goto err;
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if ((s->d1->internal->buffered_messages = pqueue_new()) == NULL)
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goto err;
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if ((s->d1->sent_messages = pqueue_new()) == NULL)
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goto err;
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if ((s->d1->internal->buffered_app_data.q = pqueue_new()) == NULL)
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goto err;
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if (s->server)
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s->d1->internal->cookie_len = sizeof(D1I(s)->cookie);
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s->method->internal->ssl_clear(s);
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return (1);
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err:
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dtls1_free(s);
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return (0);
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}
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static void
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dtls1_drain_records(pqueue queue)
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{
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pitem *item;
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DTLS1_RECORD_DATA_INTERNAL *rdata;
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if (queue == NULL)
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return;
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while ((item = pqueue_pop(queue)) != NULL) {
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rdata = (DTLS1_RECORD_DATA_INTERNAL *)item->data;
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ssl3_release_buffer(&rdata->rbuf);
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free(item->data);
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pitem_free(item);
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}
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}
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static void
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dtls1_drain_fragments(pqueue queue)
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{
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pitem *item;
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if (queue == NULL)
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return;
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while ((item = pqueue_pop(queue)) != NULL) {
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dtls1_hm_fragment_free(item->data);
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pitem_free(item);
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}
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}
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static void
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dtls1_clear_queues(SSL *s)
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{
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dtls1_drain_records(D1I(s)->unprocessed_rcds.q);
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dtls1_drain_records(D1I(s)->processed_rcds.q);
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dtls1_drain_fragments(D1I(s)->buffered_messages);
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dtls1_drain_fragments(s->d1->sent_messages);
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dtls1_drain_records(D1I(s)->buffered_app_data.q);
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}
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void
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dtls1_free(SSL *s)
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{
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if (s == NULL)
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return;
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ssl3_free(s);
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dtls1_clear_queues(s);
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pqueue_free(D1I(s)->unprocessed_rcds.q);
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pqueue_free(D1I(s)->processed_rcds.q);
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pqueue_free(D1I(s)->buffered_messages);
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pqueue_free(s->d1->sent_messages);
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pqueue_free(D1I(s)->buffered_app_data.q);
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freezero(s->d1->internal, sizeof(*s->d1->internal));
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freezero(s->d1, sizeof(*s->d1));
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s->d1 = NULL;
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}
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void
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dtls1_clear(SSL *s)
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{
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struct dtls1_state_internal_st *internal;
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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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if (s->d1) {
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unprocessed_rcds = D1I(s)->unprocessed_rcds.q;
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processed_rcds = D1I(s)->processed_rcds.q;
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buffered_messages = D1I(s)->buffered_messages;
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sent_messages = s->d1->sent_messages;
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buffered_app_data = D1I(s)->buffered_app_data.q;
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mtu = D1I(s)->mtu;
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dtls1_clear_queues(s);
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memset(s->d1->internal, 0, sizeof(*s->d1->internal));
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internal = s->d1->internal;
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memset(s->d1, 0, sizeof(*s->d1));
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s->d1->internal = internal;
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if (s->server) {
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D1I(s)->cookie_len = sizeof(D1I(s)->cookie);
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}
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if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
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D1I(s)->mtu = mtu;
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}
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D1I(s)->unprocessed_rcds.q = unprocessed_rcds;
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D1I(s)->processed_rcds.q = processed_rcds;
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D1I(s)->buffered_messages = buffered_messages;
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s->d1->sent_messages = sent_messages;
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D1I(s)->buffered_app_data.q = buffered_app_data;
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}
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ssl3_clear(s);
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s->version = DTLS1_VERSION;
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}
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long
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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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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 *
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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
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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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s->d1->timeout_duration = 1;
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}
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/* Set timeout to current time */
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gettimeofday(&(s->d1->next_timeout), NULL);
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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*
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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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gettimeofday(&timenow, NULL);
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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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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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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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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
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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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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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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
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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
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dtls1_stop_timer(SSL *s)
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{
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/* Reset everything */
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memset(&(D1I(s)->timeout), 0, sizeof(struct dtls1_timeout_st));
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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,
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&(s->d1->next_timeout));
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/* Clear retransmission buffer */
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dtls1_clear_record_buffer(s);
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}
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int
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dtls1_check_timeout_num(SSL *s)
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{
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D1I(s)->timeout.num_alerts++;
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/* Reduce MTU after 2 unsuccessful retransmissions */
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if (D1I(s)->timeout.num_alerts > 2) {
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D1I(s)->mtu = BIO_ctrl(SSL_get_wbio(s),
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BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
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}
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if (D1I(s)->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
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/* fail the connection, enough alerts have been sent */
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SSLerror(s, SSL_R_READ_TIMEOUT_EXPIRED);
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return -1;
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}
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return 0;
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}
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int
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dtls1_handle_timeout(SSL *s)
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{
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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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return 0;
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}
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dtls1_double_timeout(s);
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if (dtls1_check_timeout_num(s) < 0)
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return -1;
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D1I(s)->timeout.read_timeouts++;
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if (D1I(s)->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
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D1I(s)->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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int
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dtls1_listen(SSL *s, struct sockaddr *client)
|
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{
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int ret;
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/* Ensure there is no state left over from a previous invocation */
|
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SSL_clear(s);
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SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
|
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D1I(s)->listen = 1;
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ret = SSL_accept(s);
|
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if (ret <= 0)
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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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void
|
||||
dtls1_build_sequence_number(unsigned char *dst, unsigned char *seq,
|
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unsigned short epoch)
|
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{
|
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CBB cbb;
|
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if (!CBB_init_fixed(&cbb, dst, SSL3_SEQUENCE_SIZE))
|
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goto err;
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if (!CBB_add_u16(&cbb, epoch))
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goto err;
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if (!CBB_add_bytes(&cbb, &seq[2], SSL3_SEQUENCE_SIZE - 2))
|
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goto err;
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if (!CBB_finish(&cbb, NULL, NULL))
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goto err;
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return;
|
||||
|
||||
err:
|
||||
CBB_cleanup(&cbb);
|
||||
}
|
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