X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fprotocol_key.c;h=069cfd5f8ff8dd26abb1b3fd1bbcc93faa9fdfff;hb=103543aa2c15d9f1e2aa313a2e593a7524cce484;hp=52666d998698d2d1f6d89f01f67836bf067aa51a;hpb=046158a216e78a0412186ec8463157f6bce45d5d;p=tinc

diff --git a/src/protocol_key.c b/src/protocol_key.c
index 52666d99..069cfd5f 100644
--- a/src/protocol_key.c
+++ b/src/protocol_key.c
@@ -1,7 +1,7 @@
 /*
     protocol_key.c -- handle the meta-protocol, key exchange
     Copyright (C) 1999-2005 Ivo Timmermans,
-                  2000-2006 Guus Sliepen <guus@tinc-vpn.org>
+                  2000-2010 Guus Sliepen <guus@tinc-vpn.org>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -13,11 +13,9 @@
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-    $Id$
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
 #include "system.h"
@@ -25,6 +23,7 @@
 #include "splay_tree.h"
 #include "cipher.h"
 #include "connection.h"
+#include "crypto.h"
 #include "logger.h"
 #include "net.h"
 #include "netutl.h"
@@ -35,27 +34,27 @@
 
 static bool mykeyused = false;
 
-bool send_key_changed(connection_t *c, const node_t *n) {
-	cp();
+void send_key_changed() {
+	avl_node_t *node;
+	connection_t *c;
 
-	/* Only send this message if some other daemon requested our key previously.
-	   This reduces unnecessary key_changed broadcasts.
-	 */
+	send_request(broadcast, "%d %x %s", KEY_CHANGED, rand(), myself->name);
 
-	if(n == myself && !mykeyused)
-		return true;
+	/* Immediately send new keys to directly connected nodes to keep UDP mappings alive */
 
-	return send_request(c, "%d %lx %s", KEY_CHANGED, random(), n->name);
+	for(node = connection_tree->head; node; node = node->next) {
+		c = node->data;
+		if(c->status.active && c->node && c->node->status.reachable)
+			send_ans_key(c->node);
+	}
 }
 
 bool key_changed_h(connection_t *c, char *request) {
 	char name[MAX_STRING_SIZE];
 	node_t *n;
 
-	cp();
-
 	if(sscanf(request, "%*d %*x " MAX_STRING, name) != 1) {
-		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
+		logger(LOG_ERR, "Got bad %s from %s (%s)", "KEY_CHANGED",
 			   c->name, c->hostname);
 		return false;
 	}
@@ -66,13 +65,13 @@ bool key_changed_h(connection_t *c, char *request) {
 	n = lookup_node(name);
 
 	if(!n) {
-		logger(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"),
+		logger(LOG_ERR, "Got %s from %s (%s) origin %s which does not exist",
 			   "KEY_CHANGED", c->name, c->hostname, name);
-		return false;
+		return true;
 	}
 
 	n->status.validkey = false;
-	n->status.waitingforkey = false;
+	n->last_req_key = 0;
 
 	/* Tell the others */
 
@@ -82,10 +81,8 @@ bool key_changed_h(connection_t *c, char *request) {
 	return true;
 }
 
-bool send_req_key(connection_t *c, const node_t *from, const node_t *to) {
-	cp();
-
-	return send_request(c, "%d %s %s", REQ_KEY, from->name, to->name);
+bool send_req_key(node_t *to) {
+	return send_request(to->nexthop->connection, "%d %s %s", REQ_KEY, myself->name, to->name);
 }
 
 bool req_key_h(connection_t *c, char *request) {
@@ -93,150 +90,184 @@ bool req_key_h(connection_t *c, char *request) {
 	char to_name[MAX_STRING_SIZE];
 	node_t *from, *to;
 
-	cp();
-
 	if(sscanf(request, "%*d " MAX_STRING " " MAX_STRING, from_name, to_name) != 2) {
-		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY", c->name,
+		logger(LOG_ERR, "Got bad %s from %s (%s)", "REQ_KEY", c->name,
 			   c->hostname);
 		return false;
 	}
 
+	if(!check_id(from_name) || !check_id(to_name)) {
+		logger(LOG_ERR, "Got bad %s from %s (%s): %s", "REQ_KEY", c->name, c->hostname, "invalid name");
+		return false;
+	}
+
 	from = lookup_node(from_name);
 
 	if(!from) {
-		logger(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"),
+		logger(LOG_ERR, "Got %s from %s (%s) origin %s which does not exist in our connection list",
 			   "REQ_KEY", c->name, c->hostname, from_name);
-		return false;
+		return true;
 	}
 
 	to = lookup_node(to_name);
 
 	if(!to) {
-		logger(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"),
+		logger(LOG_ERR, "Got %s from %s (%s) destination %s which does not exist in our connection list",
 			   "REQ_KEY", c->name, c->hostname, to_name);
-		return false;
+		return true;
 	}
 
 	/* Check if this key request is for us */
 
 	if(to == myself) {			/* Yes, send our own key back */
-		mykeyused = true;
-		from->received_seqno = 0;
-		memset(from->late, 0, sizeof(from->late));
-		send_ans_key(c, myself, from);
+
+		send_ans_key(from);
 	} else {
 		if(tunnelserver)
-			return false;
+			return true;
+
+		if(!to->status.reachable) {
+			logger(LOG_WARNING, "Got %s from %s (%s) destination %s which is not reachable",
+				"REQ_KEY", c->name, c->hostname, to_name);
+			return true;
+		}
 
-		send_req_key(to->nexthop->connection, from, to);
+		send_request(to->nexthop->connection, "%s", request);
 	}
 
 	return true;
 }
 
-bool send_ans_key(connection_t *c, const node_t *from, const node_t *to) {
-	size_t keylen = cipher_keylength(&from->cipher);
+bool send_ans_key(node_t *to) {
+	size_t keylen = cipher_keylength(&myself->incipher);
 	char key[keylen * 2 + 1];
 
-	cp();
+	cipher_open_by_nid(&to->incipher, cipher_get_nid(&myself->incipher));
+	digest_open_by_nid(&to->indigest, digest_get_nid(&myself->indigest), digest_length(&myself->indigest));
+	to->incompression = myself->incompression;
+
+	randomize(key, keylen);
+	cipher_set_key(&to->incipher, key, true);
+	digest_set_key(&to->indigest, key, keylen);
 
-	cipher_get_key(&from->cipher, key);
 	bin2hex(key, key, keylen);
 	key[keylen * 2] = '\0';
 
-	return send_request(c, "%d %s %s %s %d %d %d %d", ANS_KEY,
-						from->name, to->name, key,
-						cipher_get_nid(&from->cipher),
-						digest_get_nid(&from->digest), from->maclength,
-						from->compression);
+	// Reset sequence number and late packet window
+	mykeyused = true;
+	to->received_seqno = 0;
+	memset(to->late, 0, sizeof(to->late));
+
+	return send_request(to->nexthop->connection, "%d %s %s %s %d %d %zu %d", ANS_KEY,
+						myself->name, to->name, key,
+						cipher_get_nid(&to->incipher),
+						digest_get_nid(&to->indigest),
+						digest_length(&to->indigest),
+						to->incompression);
 }
 
 bool ans_key_h(connection_t *c, char *request) {
 	char from_name[MAX_STRING_SIZE];
 	char to_name[MAX_STRING_SIZE];
 	char key[MAX_STRING_SIZE];
-	int cipher, digest, maclength, compression;
+        char address[MAX_STRING_SIZE] = "";
+        char port[MAX_STRING_SIZE] = "";
+	int cipher, digest, maclength, compression, keylen;
 	node_t *from, *to;
 
-	cp();
-
 	if(sscanf(request, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d",
 		from_name, to_name, key, &cipher, &digest, &maclength,
-		&compression) != 7) {
-		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY", c->name,
+		&compression, address, port) < 7) {
+		logger(LOG_ERR, "Got bad %s from %s (%s)", "ANS_KEY", c->name,
 			   c->hostname);
 		return false;
 	}
 
+	if(!check_id(from_name) || !check_id(to_name)) {
+		logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ANS_KEY", c->name, c->hostname, "invalid name");
+		return false;
+	}
+
 	from = lookup_node(from_name);
 
 	if(!from) {
-		logger(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"),
+		logger(LOG_ERR, "Got %s from %s (%s) origin %s which does not exist in our connection list",
 			   "ANS_KEY", c->name, c->hostname, from_name);
-		return false;
+		return true;
 	}
 
 	to = lookup_node(to_name);
 
 	if(!to) {
-		logger(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"),
+		logger(LOG_ERR, "Got %s from %s (%s) destination %s which does not exist in our connection list",
 			   "ANS_KEY", c->name, c->hostname, to_name);
-		return false;
+		return true;
 	}
 
 	/* Forward it if necessary */
 
 	if(to != myself) {
 		if(tunnelserver)
-			return false;
+			return true;
+
+		if(!to->status.reachable) {
+			logger(LOG_WARNING, "Got %s from %s (%s) destination %s which is not reachable",
+				   "ANS_KEY", c->name, c->hostname, to_name);
+			return true;
+		}
 
 		return send_request(to->nexthop->connection, "%s", request);
 	}
 
 	/* Check and lookup cipher and digest algorithms */
 
-	if(!cipher_open_by_nid(&from->cipher, cipher)) {
-		logger(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
+	if(!cipher_open_by_nid(&from->outcipher, cipher)) {
+		logger(LOG_ERR, "Node %s (%s) uses unknown cipher!", from->name, from->hostname);
 		return false;
 	}
 
-	if(strlen(key) / 2 != cipher_keylength(&from->cipher)) {
-		logger(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
+	keylen = strlen(key) / 2;
+
+	if(keylen != cipher_keylength(&from->outcipher)) {
+		logger(LOG_ERR, "Node %s (%s) uses wrong keylength!", from->name, from->hostname);
 		return false;
 	}
 
-	from->maclength = maclength;
-
-	if(!digest_open_by_nid(&from->digest, digest)) {
-		logger(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname);
+	if(!digest_open_by_nid(&from->outdigest, digest, maclength)) {
+		logger(LOG_ERR, "Node %s (%s) uses unknown digest!", from->name, from->hostname);
 		return false;
 	}
 
-	if(from->maclength > digest_length(&from->digest) || from->maclength < 0) {
-		logger(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname);
+	if(maclength != digest_length(&from->outdigest)) {
+		logger(LOG_ERR, "Node %s (%s) uses bogus MAC length!", from->name, from->hostname);
 		return false;
 	}
 
 	if(compression < 0 || compression > 11) {
-		logger(LOG_ERR, _("Node %s (%s) uses bogus compression level!"), from->name, from->hostname);
-		return false;
+		logger(LOG_ERR, "Node %s (%s) uses bogus compression level!", from->name, from->hostname);
+		return true;
 	}
 	
-	from->compression = compression;
+	from->outcompression = compression;
 
 	/* Update our copy of the origin's packet key */
 
-	hex2bin(key, key, cipher_keylength(&from->cipher));
-	cipher_set_key(&from->cipher, key, false);
+	hex2bin(key, key, keylen);
+	cipher_set_key(&from->outcipher, key, false);
+	digest_set_key(&from->outdigest, key, keylen);
 
 	from->status.validkey = true;
 	from->status.waitingforkey = false;
 	from->sent_seqno = 0;
 
+	if(*address && *port) {
+		ifdebug(PROTOCOL) logger(LOG_DEBUG, "Using reflexive UDP address from %s: %s port %s", from->name, address, port);
+		sockaddr_t sa = str2sockaddr(address, port);
+		update_node_udp(from, &sa);
+	}
+
 	if(from->options & OPTION_PMTU_DISCOVERY && !from->mtuprobes)
 		send_mtu_probe(from);
 
-	flush_queue(from);
-
 	return true;
 }