[thirdparty/openssl.git] / ssl / d1_lib.c

/* ssl/d1_lib.c */
/* 
 * DTLS implementation written by Nagendra Modadugu
 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
 */
/* ====================================================================
 * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#define USE_SOCKETS
#include <openssl/objects.h>
#include "ssl_locl.h"

#if defined(OPENSSL_SYS_VMS)
#include <sys/timeb.h>
#endif

static void get_current_time(struct timeval *t);
static void dtls1_set_handshake_header(SSL *s, int type, unsigned long len);
static int dtls1_handshake_write(SSL *s);
const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
int dtls1_listen(SSL *s, struct sockaddr *client);

const SSL3_ENC_METHOD DTLSv1_enc_data={
    	tls1_enc,
	tls1_mac,
	tls1_setup_key_block,
	tls1_generate_master_secret,
	tls1_change_cipher_state,
	tls1_final_finish_mac,
	TLS1_FINISH_MAC_LENGTH,
	tls1_cert_verify_mac,
	TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
	TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
	tls1_alert_code,
	tls1_export_keying_material,
	SSL_ENC_FLAG_DTLS|SSL_ENC_FLAG_EXPLICIT_IV,
	DTLS1_HM_HEADER_LENGTH,
	dtls1_set_handshake_header,
	dtls1_handshake_write	
	};

const SSL3_ENC_METHOD DTLSv1_2_enc_data={
    	tls1_enc,
	tls1_mac,
	tls1_setup_key_block,
	tls1_generate_master_secret,
	tls1_change_cipher_state,
	tls1_final_finish_mac,
	TLS1_FINISH_MAC_LENGTH,
	tls1_cert_verify_mac,
	TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
	TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
	tls1_alert_code,
	tls1_export_keying_material,
	SSL_ENC_FLAG_DTLS|SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS
		|SSL_ENC_FLAG_SHA256_PRF|SSL_ENC_FLAG_TLS1_2_CIPHERS,
	DTLS1_HM_HEADER_LENGTH,
	dtls1_set_handshake_header,
	dtls1_handshake_write	
	};

long dtls1_default_timeout(void)
	{
	/* 2 hours, the 24 hours mentioned in the DTLSv1 spec
	 * is way too long for http, the cache would over fill */
	return(60*60*2);
	}

int dtls1_new(SSL *s)
	{
	DTLS1_STATE *d1;

	if (!ssl3_new(s)) return(0);
	if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
	memset(d1,0, sizeof *d1);

	/* d1->handshake_epoch=0; */

	d1->unprocessed_rcds.q=pqueue_new();
	d1->processed_rcds.q=pqueue_new();
	d1->buffered_messages = pqueue_new();
	d1->sent_messages=pqueue_new();
	d1->buffered_app_data.q=pqueue_new();

	if ( s->server)
		{
		d1->cookie_len = sizeof(s->d1->cookie);
		}

	if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q 
        || ! d1->buffered_messages || ! d1->sent_messages || ! d1->buffered_app_data.q)
		{
        if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
        if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
        if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
		if ( d1->sent_messages) pqueue_free(d1->sent_messages);
		if ( d1->buffered_app_data.q) pqueue_free(d1->buffered_app_data.q);
		OPENSSL_free(d1);
		return (0);
		}

	s->d1=d1;
	s->method->ssl_clear(s);
	return(1);
	}

static void dtls1_clear_queues(SSL *s)
	{
    pitem *item = NULL;
    hm_fragment *frag = NULL;
	DTLS1_RECORD_DATA *rdata;

    while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
        {
		rdata = (DTLS1_RECORD_DATA *) item->data;
		if (rdata->rbuf.buf)
			{
			OPENSSL_free(rdata->rbuf.buf);
			}
        OPENSSL_free(item->data);
        pitem_free(item);
        }

    while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
        {
		rdata = (DTLS1_RECORD_DATA *) item->data;
		if (rdata->rbuf.buf)
			{
			OPENSSL_free(rdata->rbuf.buf);
			}
        OPENSSL_free(item->data);
        pitem_free(item);
        }

    while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
        {
        frag = (hm_fragment *)item->data;
        dtls1_hm_fragment_free(frag);
        pitem_free(item);
        }

    while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
        {
        frag = (hm_fragment *)item->data;
        dtls1_hm_fragment_free(frag);
        pitem_free(item);
        }

	while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL)
		{
		rdata = (DTLS1_RECORD_DATA *) item->data;
		if (rdata->rbuf.buf)
			{
			OPENSSL_free(rdata->rbuf.buf);
			}
		OPENSSL_free(item->data);
		pitem_free(item);
		}
	}

void dtls1_free(SSL *s)
	{
	ssl3_free(s);

	dtls1_clear_queues(s);

    pqueue_free(s->d1->unprocessed_rcds.q);
    pqueue_free(s->d1->processed_rcds.q);
    pqueue_free(s->d1->buffered_messages);
	pqueue_free(s->d1->sent_messages);
	pqueue_free(s->d1->buffered_app_data.q);

	OPENSSL_free(s->d1);
	s->d1 = NULL;
	}

void dtls1_clear(SSL *s)
	{
    pqueue unprocessed_rcds;
    pqueue processed_rcds;
    pqueue buffered_messages;
	pqueue sent_messages;
	pqueue buffered_app_data;
	unsigned int mtu;

	if (s->d1)
		{
		unprocessed_rcds = s->d1->unprocessed_rcds.q;
		processed_rcds = s->d1->processed_rcds.q;
		buffered_messages = s->d1->buffered_messages;
		sent_messages = s->d1->sent_messages;
		buffered_app_data = s->d1->buffered_app_data.q;
		mtu = s->d1->mtu;

		dtls1_clear_queues(s);

		memset(s->d1, 0, sizeof(*(s->d1)));

		if (s->server)
			{
			s->d1->cookie_len = sizeof(s->d1->cookie);
			}

		if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)
			{
			s->d1->mtu = mtu;
			}

		s->d1->unprocessed_rcds.q = unprocessed_rcds;
		s->d1->processed_rcds.q = processed_rcds;
		s->d1->buffered_messages = buffered_messages;
		s->d1->sent_messages = sent_messages;
		s->d1->buffered_app_data.q = buffered_app_data;
		}

	ssl3_clear(s);
	if (s->options & SSL_OP_CISCO_ANYCONNECT)
		s->version=DTLS1_BAD_VER;
	else if (s->method->version == DTLS_ANY_VERSION)
		s->version=DTLS1_2_VERSION;
	else
		s->version=s->method->version;
	}

long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
	{
	int ret=0;

	switch (cmd)
		{
	case DTLS_CTRL_GET_TIMEOUT:
		if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL)
			{
			ret = 1;
			}
		break;
	case DTLS_CTRL_HANDLE_TIMEOUT:
		ret = dtls1_handle_timeout(s);
		break;
	case DTLS_CTRL_LISTEN:
		ret = dtls1_listen(s, parg);
		break;
	case SSL_CTRL_CHECK_PROTO_VERSION:
		/* For library-internal use; checks that the current protocol
		 * is the highest enabled version (according to s->ctx->method,
		 * as version negotiation may have changed s->method). */
		if (s->version == s->ctx->method->version)
			return 1;
		/* Apparently we're using a version-flexible SSL_METHOD
		 * (not at its highest protocol version). */
		if (s->ctx->method->version == DTLS_method()->version)
			{
#if DTLS_MAX_VERSION != DTLS1_2_VERSION
#  error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION.
#endif
			if (!(s->options & SSL_OP_NO_DTLSv1_2))
				return s->version == DTLS1_2_VERSION;
			if (!(s->options & SSL_OP_NO_DTLSv1))
				return s->version == DTLS1_VERSION;
			}
		return 0; /* Unexpected state; fail closed. */

	default:
		ret = ssl3_ctrl(s, cmd, larg, parg);
		break;
		}
	return(ret);
	}

/*
 * As it's impossible to use stream ciphers in "datagram" mode, this
 * simple filter is designed to disengage them in DTLS. Unfortunately
 * there is no universal way to identify stream SSL_CIPHER, so we have
 * to explicitly list their SSL_* codes. Currently RC4 is the only one
 * available, but if new ones emerge, they will have to be added...
 */
const SSL_CIPHER *dtls1_get_cipher(unsigned int u)
	{
	const SSL_CIPHER *ciph = ssl3_get_cipher(u);

	if (ciph != NULL)
		{
		if (ciph->algorithm_enc == SSL_RC4)
			return NULL;
		}

	return ciph;
	}

void dtls1_start_timer(SSL *s)
	{
#ifndef OPENSSL_NO_SCTP
	/* Disable timer for SCTP */
	if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
		{
		memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
		return;
		}
#endif

	/* If timer is not set, initialize duration with 1 second */
	if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
		{
		s->d1->timeout_duration = 1;
		}
	
	/* Set timeout to current time */
	get_current_time(&(s->d1->next_timeout));

	/* Add duration to current time */
	s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
	BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &(s->d1->next_timeout));
	}

struct timeval* dtls1_get_timeout(SSL *s, struct timeval* timeleft)
	{
	struct timeval timenow;

	/* If no timeout is set, just return NULL */
	if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
		{
		return NULL;
		}

	/* Get current time */
	get_current_time(&timenow);

	/* If timer already expired, set remaining time to 0 */
	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_record_buffer(s);
	}

int dtls1_check_timeout_num(SSL *s)
	{
	s->d1->timeout.num_alerts++;

	/* Reduce MTU after 2 unsuccessful retransmissions */
	if (s->d1->timeout.num_alerts > 2)
		{
		s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);		
		}

	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;

	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);
	}
Commit	Line	Data
36d16f8e BL	1	/* ssl/d1_lib.c */
	2	/*
	3	* DTLS implementation written by Nagendra Modadugu
	4	* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
	5	*/
	6	/* ====================================================================
	7	* Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	*
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	*
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in
	18	* the documentation and/or other materials provided with the
	19	* distribution.
	20	*
	21	* 3. All advertising materials mentioning features or use of this
	22	* software must display the following acknowledgment:
	23	* "This product includes software developed by the OpenSSL Project
	24	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	25	*
	26	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	27	* endorse or promote products derived from this software without
	28	* prior written permission. For written permission, please contact
	29	* openssl-core@OpenSSL.org.
	30	*
	31	* 5. Products derived from this software may not be called "OpenSSL"
	32	* nor may "OpenSSL" appear in their names without prior written
	33	* permission of the OpenSSL Project.
	34	*
	35	* 6. Redistributions of any form whatsoever must retain the following
	36	* acknowledgment:
	37	* "This product includes software developed by the OpenSSL Project
	38	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	39	*
	40	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	41	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	43	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	44	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	45	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	46	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	47	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	49	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	50	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	51	* OF THE POSSIBILITY OF SUCH DAMAGE.
	52	* ====================================================================
	53	*
	54	* This product includes cryptographic software written by Eric Young
	55	* (eay@cryptsoft.com). This product includes software written by Tim
	56	* Hudson (tjh@cryptsoft.com).
	57	*
	58	*/
	59
	60	#include <stdio.h>
9289f21b	61	#define USE_SOCKETS
36d16f8e BL	62	#include <openssl/objects.h>
	63	#include "ssl_locl.h"
	64
a006fef7	65	#if defined(OPENSSL_SYS_VMS)
eb38b26d DSH	66	#include <sys/timeb.h>
	67	#endif
	68
	69	static void get_current_time(struct timeval *t);
173e72e6 DSH	70	static void dtls1_set_handshake_header(SSL *s, int type, unsigned long len);
173e72e6 DSH	71	static int dtls1_handshake_write(SSL *s);
42182852	72	const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
1fc3ac80	73	int dtls1_listen(SSL s, struct sockaddr client);
36d16f8e	74
8892ce77	75	const SSL3_ENC_METHOD DTLSv1_enc_data={
4221c0dd	76	tls1_enc,
36d16f8e BL	77	tls1_mac,
	78	tls1_setup_key_block,
	79	tls1_generate_master_secret,
	80	tls1_change_cipher_state,
	81	tls1_final_finish_mac,
	82	TLS1_FINISH_MAC_LENGTH,
	83	tls1_cert_verify_mac,
	84	TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
	85	TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
	86	tls1_alert_code,
e0af0405	87	tls1_export_keying_material,
173e72e6 DSH	88	SSL_ENC_FLAG_DTLS\|SSL_ENC_FLAG_EXPLICIT_IV,
	89	DTLS1_HM_HEADER_LENGTH,
	90	dtls1_set_handshake_header,
	91	dtls1_handshake_write
36d16f8e BL	92	};
36d16f8e BL	93
8892ce77	94	const SSL3_ENC_METHOD DTLSv1_2_enc_data={
4221c0dd	95	tls1_enc,
c3b344e3 DSH	96	tls1_mac,
	97	tls1_setup_key_block,
	98	tls1_generate_master_secret,
	99	tls1_change_cipher_state,
	100	tls1_final_finish_mac,
	101	TLS1_FINISH_MAC_LENGTH,
	102	tls1_cert_verify_mac,
	103	TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
	104	TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
	105	tls1_alert_code,
	106	tls1_export_keying_material,
4221c0dd DSH	107	SSL_ENC_FLAG_DTLS\|SSL_ENC_FLAG_EXPLICIT_IV\|SSL_ENC_FLAG_SIGALGS
4221c0dd DSH	108	\|SSL_ENC_FLAG_SHA256_PRF\|SSL_ENC_FLAG_TLS1_2_CIPHERS,
c3b344e3 DSH	109	DTLS1_HM_HEADER_LENGTH,
	110	dtls1_set_handshake_header,
	111	dtls1_handshake_write
	112	};
	113
f3b656b2	114	long dtls1_default_timeout(void)
36d16f8e BL	115	{
	116	/* 2 hours, the 24 hours mentioned in the DTLSv1 spec
	117	* is way too long for http, the cache would over fill */
	118	return(60602);
	119	}
	120
36d16f8e BL	121	int dtls1_new(SSL *s)
	122	{
	123	DTLS1_STATE *d1;
	124
	125	if (!ssl3_new(s)) return(0);
	126	if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
	127	memset(d1,0, sizeof *d1);
	128
	129	/* d1->handshake_epoch=0; */
188b0579	130
36d16f8e	131	d1->unprocessed_rcds.q=pqueue_new();
188b0579 RL	132	d1->processed_rcds.q=pqueue_new();
188b0579 RL	133	d1->buffered_messages = pqueue_new();
36d16f8e	134	d1->sent_messages=pqueue_new();
e5fa864f	135	d1->buffered_app_data.q=pqueue_new();
36d16f8e BL	136
	137	if ( s->server)
	138	{
	139	d1->cookie_len = sizeof(s->d1->cookie);
	140	}
	141
	142	if( ! d1->unprocessed_rcds.q \|\| ! d1->processed_rcds.q
e5fa864f	143	\|\| ! d1->buffered_messages \|\| ! d1->sent_messages \|\| ! d1->buffered_app_data.q)
36d16f8e BL	144	{
	145	if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
	146	if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
	147	if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
	148	if ( d1->sent_messages) pqueue_free(d1->sent_messages);
e5fa864f	149	if ( d1->buffered_app_data.q) pqueue_free(d1->buffered_app_data.q);
36d16f8e BL	150	OPENSSL_free(d1);
	151	return (0);
	152	}
	153
	154	s->d1=d1;
	155	s->method->ssl_clear(s);
	156	return(1);
	157	}
	158
7832d6ab	159	static void dtls1_clear_queues(SSL *s)
36d16f8e BL	160	{
	161	pitem *item = NULL;
	162	hm_fragment *frag = NULL;
006b54a8 DSH	163	DTLS1_RECORD_DATA *rdata;
006b54a8 DSH	164
36d16f8e BL	165	while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
36d16f8e BL	166	{
006b54a8 DSH	167	rdata = (DTLS1_RECORD_DATA *) item->data;
	168	if (rdata->rbuf.buf)
	169	{
	170	OPENSSL_free(rdata->rbuf.buf);
	171	}
36d16f8e BL	172	OPENSSL_free(item->data);
	173	pitem_free(item);
	174	}
36d16f8e BL	175
	176	while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
	177	{
006b54a8 DSH	178	rdata = (DTLS1_RECORD_DATA *) item->data;
	179	if (rdata->rbuf.buf)
	180	{
	181	OPENSSL_free(rdata->rbuf.buf);
	182	}
36d16f8e BL	183	OPENSSL_free(item->data);
	184	pitem_free(item);
	185	}
36d16f8e BL	186
	187	while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
	188	{
	189	frag = (hm_fragment *)item->data;
8a35dbb6	190	dtls1_hm_fragment_free(frag);
36d16f8e BL	191	pitem_free(item);
36d16f8e BL	192	}
36d16f8e BL	193
	194	while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
	195	{
	196	frag = (hm_fragment *)item->data;
8a35dbb6	197	dtls1_hm_fragment_free(frag);
36d16f8e BL	198	pitem_free(item);
36d16f8e BL	199	}
36d16f8e	200
e5fa864f DSH	201	while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL)
e5fa864f DSH	202	{
470990fe	203	rdata = (DTLS1_RECORD_DATA *) item->data;
	204	if (rdata->rbuf.buf)
	205	{
	206	OPENSSL_free(rdata->rbuf.buf);
	207	}
	208	OPENSSL_free(item->data);
e5fa864f DSH	209	pitem_free(item);
e5fa864f DSH	210	}
7832d6ab DSH	211	}
	212
	213	void dtls1_free(SSL *s)
	214	{
	215	ssl3_free(s);
	216
	217	dtls1_clear_queues(s);
	218
	219	pqueue_free(s->d1->unprocessed_rcds.q);
	220	pqueue_free(s->d1->processed_rcds.q);
	221	pqueue_free(s->d1->buffered_messages);
	222	pqueue_free(s->d1->sent_messages);
e5fa864f DSH	223	pqueue_free(s->d1->buffered_app_data.q);
e5fa864f DSH	224
36d16f8e	225	OPENSSL_free(s->d1);
04638f2f	226	s->d1 = NULL;
36d16f8e BL	227	}
	228
	229	void dtls1_clear(SSL *s)
	230	{
7832d6ab DSH	231	pqueue unprocessed_rcds;
	232	pqueue processed_rcds;
	233	pqueue buffered_messages;
	234	pqueue sent_messages;
	235	pqueue buffered_app_data;
1d7392f2 DSH	236	unsigned int mtu;
1d7392f2 DSH	237
7832d6ab DSH	238	if (s->d1)
	239	{
	240	unprocessed_rcds = s->d1->unprocessed_rcds.q;
	241	processed_rcds = s->d1->processed_rcds.q;
	242	buffered_messages = s->d1->buffered_messages;
	243	sent_messages = s->d1->sent_messages;
	244	buffered_app_data = s->d1->buffered_app_data.q;
1d7392f2	245	mtu = s->d1->mtu;
7832d6ab DSH	246
	247	dtls1_clear_queues(s);
	248
	249	memset(s->d1, 0, sizeof(*(s->d1)));
	250
	251	if (s->server)
	252	{
	253	s->d1->cookie_len = sizeof(s->d1->cookie);
	254	}
	255
1d7392f2 DSH	256	if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)
	257	{
	258	s->d1->mtu = mtu;
	259	}
	260
7832d6ab DSH	261	s->d1->unprocessed_rcds.q = unprocessed_rcds;
	262	s->d1->processed_rcds.q = processed_rcds;
	263	s->d1->buffered_messages = buffered_messages;
	264	s->d1->sent_messages = sent_messages;
	265	s->d1->buffered_app_data.q = buffered_app_data;
	266	}
	267
36d16f8e	268	ssl3_clear(s);
8711efb4 DSH	269	if (s->options & SSL_OP_CISCO_ANYCONNECT)
8711efb4 DSH	270	s->version=DTLS1_BAD_VER;
c6913eeb DSH	271	else if (s->method->version == DTLS_ANY_VERSION)
c6913eeb DSH	272	s->version=DTLS1_2_VERSION;
8711efb4	273	else
c3b344e3	274	s->version=s->method->version;
36d16f8e	275	}
5d58f1bb	276
b972fbaa DSH	277	long dtls1_ctrl(SSL s, int cmd, long larg, void parg)
	278	{
	279	int ret=0;
	280
	281	switch (cmd)
	282	{
	283	case DTLS_CTRL_GET_TIMEOUT:
	284	if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL)
	285	{
	286	ret = 1;
	287	}
	288	break;
	289	case DTLS_CTRL_HANDLE_TIMEOUT:
	290	ret = dtls1_handle_timeout(s);
	291	break;
1fc3ac80 DSH	292	case DTLS_CTRL_LISTEN:
	293	ret = dtls1_listen(s, parg);
	294	break;
cf6da053 BM	295	case SSL_CTRL_CHECK_PROTO_VERSION:
	296	/* For library-internal use; checks that the current protocol
	297	* is the highest enabled version (according to s->ctx->method,
	298	* as version negotiation may have changed s->method). */
	299	if (s->version == s->ctx->method->version)
	300	return 1;
	301	/* Apparently we're using a version-flexible SSL_METHOD
	302	* (not at its highest protocol version). */
	303	if (s->ctx->method->version == DTLS_method()->version)
	304	{
	305	#if DTLS_MAX_VERSION != DTLS1_2_VERSION
	306	# error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION.
	307	#endif
	308	if (!(s->options & SSL_OP_NO_DTLSv1_2))
	309	return s->version == DTLS1_2_VERSION;
	310	if (!(s->options & SSL_OP_NO_DTLSv1))
	311	return s->version == DTLS1_VERSION;
	312	}
	313	return 0; /* Unexpected state; fail closed. */
b972fbaa DSH	314
	315	default:
	316	ret = ssl3_ctrl(s, cmd, larg, parg);
	317	break;
	318	}
	319	return(ret);
	320	}
	321
5d58f1bb AP	322	/*
	323	* As it's impossible to use stream ciphers in "datagram" mode, this
	324	* simple filter is designed to disengage them in DTLS. Unfortunately
	325	* there is no universal way to identify stream SSL_CIPHER, so we have
	326	* to explicitly list their SSL_* codes. Currently RC4 is the only one
	327	* available, but if new ones emerge, they will have to be added...
	328	*/
babb3798	329	const SSL_CIPHER *dtls1_get_cipher(unsigned int u)
5d58f1bb	330	{
babb3798	331	const SSL_CIPHER *ciph = ssl3_get_cipher(u);
5d58f1bb AP	332
	333	if (ciph != NULL)
	334	{
	335	if (ciph->algorithm_enc == SSL_RC4)
	336	return NULL;
	337	}
	338
	339	return ciph;
	340	}
eb38b26d DSH	341
	342	void dtls1_start_timer(SSL *s)
	343	{
7e159e01 DSH	344	#ifndef OPENSSL_NO_SCTP
	345	/* Disable timer for SCTP */
	346	if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
	347	{
	348	memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
	349	return;
	350	}
	351	#endif
	352
eb38b26d DSH	353	/* If timer is not set, initialize duration with 1 second */
	354	if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
	355	{
	356	s->d1->timeout_duration = 1;
	357	}
	358
	359	/* Set timeout to current time */
	360	get_current_time(&(s->d1->next_timeout));
	361
	362	/* Add duration to current time */
	363	s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
	364	BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &(s->d1->next_timeout));
	365	}
	366
	367	struct timeval* dtls1_get_timeout(SSL s, struct timeval timeleft)
	368	{
	369	struct timeval timenow;
	370
	371	/* If no timeout is set, just return NULL */
	372	if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
	373	{
	374	return NULL;
	375	}
	376
	377	/* Get current time */
	378	get_current_time(&timenow);
	379
	380	/* If timer already expired, set remaining time to 0 */
	381	if (s->d1->next_timeout.tv_sec < timenow.tv_sec \|\|
	382	(s->d1->next_timeout.tv_sec == timenow.tv_sec &&
	383	s->d1->next_timeout.tv_usec <= timenow.tv_usec))
	384	{
	385	memset(timeleft, 0, sizeof(struct timeval));
	386	return timeleft;
	387	}
	388
	389	/* Calculate time left until timer expires */
	390	memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
	391	timeleft->tv_sec -= timenow.tv_sec;
	392	timeleft->tv_usec -= timenow.tv_usec;
	393	if (timeleft->tv_usec < 0)
	394	{
	395	timeleft->tv_sec--;
	396	timeleft->tv_usec += 1000000;
	397	}
	398
87a37cba DSH	399	/* If remaining time is less than 15 ms, set it to 0
	400	* to prevent issues because of small devergences with
	401	* socket timeouts.
	402	*/
	403	if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000)
	404	{
	405	memset(timeleft, 0, sizeof(struct timeval));
	406	}
	407
	408
eb38b26d DSH	409	return timeleft;
	410	}
	411
	412	int dtls1_is_timer_expired(SSL *s)
	413	{
	414	struct timeval timeleft;
	415
	416	/* Get time left until timeout, return false if no timer running */
	417	if (dtls1_get_timeout(s, &timeleft) == NULL)
	418	{
	419	return 0;
	420	}
	421
	422	/* Return false if timer is not expired yet */
	423	if (timeleft.tv_sec > 0 \|\| timeleft.tv_usec > 0)
	424	{
	425	return 0;
	426	}
	427
	428	/* Timer expired, so return true */
	429	return 1;
	430	}
	431
	432	void dtls1_double_timeout(SSL *s)
	433	{
	434	s->d1->timeout_duration *= 2;
	435	if (s->d1->timeout_duration > 60)
	436	s->d1->timeout_duration = 60;
	437	dtls1_start_timer(s);
	438	}
	439
	440	void dtls1_stop_timer(SSL *s)
	441	{
	442	/* Reset everything */
ea6e3860	443	memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st));
eb38b26d DSH	444	memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
	445	s->d1->timeout_duration = 1;
	446	BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &(s->d1->next_timeout));
4058861f DSH	447	/* Clear retransmission buffer */
4058861f DSH	448	dtls1_clear_record_buffer(s);
eb38b26d DSH	449	}
eb38b26d DSH	450
ea6e3860	451	int dtls1_check_timeout_num(SSL *s)
b972fbaa	452	{
ea6e3860	453	s->d1->timeout.num_alerts++;
b972fbaa	454
ea6e3860 DSH	455	/* Reduce MTU after 2 unsuccessful retransmissions */
ea6e3860 DSH	456	if (s->d1->timeout.num_alerts > 2)
b972fbaa	457	{
ea6e3860	458	s->d1->mtu = BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
b972fbaa DSH	459	}
b972fbaa DSH	460
ea6e3860	461	if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
b972fbaa DSH	462	{
b972fbaa DSH	463	/* fail the connection, enough alerts have been sent */
aa09c2c6	464	SSLerr(SSL_F_DTLS1_CHECK_TIMEOUT_NUM,SSL_R_READ_TIMEOUT_EXPIRED);
861a7e5c	465	return -1;
b972fbaa DSH	466	}
b972fbaa DSH	467
ea6e3860 DSH	468	return 0;
	469	}
	470
	471	int dtls1_handle_timeout(SSL *s)
	472	{
	473	/* if no timer is expired, don't do anything */
	474	if (!dtls1_is_timer_expired(s))
b972fbaa	475	{
ea6e3860	476	return 0;
b972fbaa DSH	477	}
b972fbaa DSH	478
ea6e3860 DSH	479	dtls1_double_timeout(s);
	480
	481	if (dtls1_check_timeout_num(s) < 0)
	482	return -1;
	483
	484	s->d1->timeout.read_timeouts++;
	485	if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
62b6948a	486	{
ea6e3860	487	s->d1->timeout.read_timeouts = 1;
62b6948a DSH	488	}
62b6948a DSH	489
4817504d DSH	490	#ifndef OPENSSL_NO_HEARTBEATS
	491	if (s->tlsext_hb_pending)
	492	{
	493	s->tlsext_hb_pending = 0;
	494	return dtls1_heartbeat(s);
	495	}
	496	#endif
	497
b972fbaa DSH	498	dtls1_start_timer(s);
	499	return dtls1_retransmit_buffered_messages(s);
	500	}
	501
eb38b26d DSH	502	static void get_current_time(struct timeval *t)
eb38b26d DSH	503	{
a006fef7	504	#if defined(_WIN32)
f469880c AP	505	SYSTEMTIME st;
	506	union { unsigned __int64 ul; FILETIME ft; } now;
	507
	508	GetSystemTime(&st);
	509	SystemTimeToFileTime(&st,&now.ft);
972b0dc3 AP	510	#ifdef __MINGW32__
	511	now.ul -= 116444736000000000ULL;
	512	#else
f469880c	513	now.ul -= 116444736000000000UI64; /* re-bias to 1/1/1970 */
972b0dc3	514	#endif
f469880c AP	515	t->tv_sec = (long)(now.ul/10000000);
f469880c AP	516	t->tv_usec = ((int)(now.ul%10000000))/10;
eb38b26d DSH	517	#elif defined(OPENSSL_SYS_VMS)
	518	struct timeb tb;
	519	ftime(&tb);
	520	t->tv_sec = (long)tb.time;
	521	t->tv_usec = (long)tb.millitm * 1000;
	522	#else
	523	gettimeofday(t, NULL);
	524	#endif
	525	}
1fc3ac80 DSH	526
	527	int dtls1_listen(SSL s, struct sockaddr client)
	528	{
	529	int ret;
	530
	531	SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
	532	s->d1->listen = 1;
	533
	534	ret = SSL_accept(s);
	535	if (ret <= 0) return ret;
	536
	537	(void) BIO_dgram_get_peer(SSL_get_rbio(s), client);
	538	return 1;
	539	}
173e72e6 DSH	540
	541	static void dtls1_set_handshake_header(SSL *s, int htype, unsigned long len)
	542	{
	543	unsigned char p = (unsigned char )s->init_buf->data;
	544	dtls1_set_message_header(s, p, htype, len, 0, len);
	545	s->init_num = (int)len + DTLS1_HM_HEADER_LENGTH;
	546	s->init_off = 0;
	547	/* Buffer the message to handle re-xmits */
	548	dtls1_buffer_message(s, 0);
	549	}
	550
	551	static int dtls1_handshake_write(SSL *s)
	552	{
	553	return dtls1_do_write(s, SSL3_RT_HANDSHAKE);
	554	}