1 files changed, 443 insertions, 0 deletions

diff --git a/openssl/ssl/d1_lib.c b/openssl/ssl/d1_lib.c
new file mode 100644
index 00000000..48e8b6ff
--- /dev/null
+++ b/openssl/ssl/d1_lib.c
@@ -0,0 +1,443 @@
+/* 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_WIN32) || defined(OPENSSL_SYS_VMS)
+#include <sys/timeb.h>
+#endif
+
+static void get_current_time(struct timeval *t);
+const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
+int dtls1_listen(SSL *s, struct sockaddr *client);
+
+SSL3_ENC_METHOD DTLSv1_enc_data={
+    dtls1_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,
+	};
+
+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;
+        OPENSSL_free(frag->fragment);
+        OPENSSL_free(frag);
+        pitem_free(item);
+        }
+
+    while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
+        {
+        frag = (hm_fragment *)item->data;
+        OPENSSL_free(frag->fragment);
+        OPENSSL_free(frag);
+        pitem_free(item);
+        }
+
+	while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL)
+		{
+		frag = (hm_fragment *)item->data;
+		OPENSSL_free(frag->fragment);
+		OPENSSL_free(frag);
+		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);
+	}
+
+void dtls1_clear(SSL *s)
+	{
+    pqueue unprocessed_rcds;
+    pqueue processed_rcds;
+    pqueue buffered_messages;
+	pqueue sent_messages;
+	pqueue buffered_app_data;
+	
+	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;
+
+		dtls1_clear_queues(s);
+
+		memset(s->d1, 0, sizeof(*(s->d1)));
+
+		if (s->server)
+			{
+			s->d1->cookie_len = sizeof(s->d1->cookie);
+			}
+
+		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
+		s->version=DTLS1_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;
+
+	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)
+	{
+	/* 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->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_handle_timeout(SSL *s)
+	{
+	DTLS1_STATE *state;
+
+	/* if no timer is expired, don't do anything */
+	if (!dtls1_is_timer_expired(s))
+		{
+		return 0;
+		}
+
+	dtls1_double_timeout(s);
+	state = s->d1;
+	state->timeout.num_alerts++;
+	if ( state->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
+		{
+		/* fail the connection, enough alerts have been sent */
+		SSLerr(SSL_F_DTLS1_HANDLE_TIMEOUT,SSL_R_READ_TIMEOUT_EXPIRED);
+		return -1;
+		}
+
+	state->timeout.read_timeouts++;
+	if ( state->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
+		{
+		state->timeout.read_timeouts = 1;
+		}
+
+	dtls1_start_timer(s);
+	return dtls1_retransmit_buffered_messages(s);
+	}
+
+static void get_current_time(struct timeval *t)
+{
+#ifdef OPENSSL_SYS_WIN32
+	struct _timeb tb;
+	_ftime(&tb);
+	t->tv_sec = (long)tb.time;
+	t->tv_usec = (long)tb.millitm * 1000;
+#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;
+	}