X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol_key.c;h=e2f67b194e08f5bf895318a3327642fc72e3e2a0;hp=f34ebaa585a64ec21416aaab565ba976c7f9d793;hb=8677b839dcd343277e1e519a2d40c8bd0a980dd5;hpb=6d08eb1614b59d5f86a43edda9db06fca72b76cd

diff --git a/src/protocol_key.c b/src/protocol_key.c
index f34ebaa5..e2f67b19 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,
-                  2000-2011 Guus Sliepen <guus@tinc-vpn.org>
+                  2000-2014 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
@@ -40,7 +40,7 @@ void send_key_changed(void) {
 	avl_node_t *node;
 	connection_t *c;
 
-	send_request(broadcast, "%d %x %s", KEY_CHANGED, rand(), myself->name);
+	send_request(everyone, "%d %x %s", KEY_CHANGED, rand(), myself->name);
 
 	/* Immediately send new keys to directly connected nodes to keep UDP mappings alive */
 
@@ -127,7 +127,8 @@ bool req_key_h(connection_t *c) {
 	/* Check if this key request is for us */
 
 	if(to == myself) {			/* Yes, send our own key back */
-		send_ans_key(from);
+		if (!send_ans_key(from))
+			return false;
 	} else {
 		if(tunnelserver)
 			return true;
@@ -156,7 +157,12 @@ bool send_ans_key(node_t *to) {
 	to->inkey = xrealloc(to->inkey, to->inkeylength);
 
 	// Create a new key
-	RAND_pseudo_bytes((unsigned char *)to->inkey, to->inkeylength);
+	if (1 != RAND_bytes((unsigned char *)to->inkey, to->inkeylength)) {
+		int err = ERR_get_error();
+		logger(LOG_ERR, "Failed to generate random for key (%s)", ERR_error_string(err, NULL));
+		return false; // Do not send insecure keys, let connection attempt fail.
+	}
+
 	if(to->incipher)
 		EVP_DecryptInit_ex(&to->inctx, to->incipher, NULL, (unsigned char *)to->inkey, (unsigned char *)to->inkey + to->incipher->key_len);
 
@@ -227,7 +233,7 @@ bool ans_key_h(connection_t *c) {
 			return true;
 		}
 
-		if(!*address && from->address.sa.sa_family != AF_UNSPEC) {
+		if(!*address && from->address.sa.sa_family != AF_UNSPEC && to->minmtu) {
 			char *address, *port;
 			ifdebug(PROTOCOL) logger(LOG_DEBUG, "Appending reflexive UDP address to ANS_KEY from %s to %s", from->name, to->name);
 			sockaddr2str(&from->address, &address, &port);
@@ -240,12 +246,16 @@ bool ans_key_h(connection_t *c) {
 		return send_request(to->nexthop->connection, "%s", c->buffer);
 	}
 
+	/* Don't use key material until every check has passed. */
+	from->status.validkey = false;
+
 	/* Update our copy of the origin's packet key */
 	from->outkey = xrealloc(from->outkey, strlen(key) / 2);
-
-	from->outkey = xstrdup(key);
 	from->outkeylength = strlen(key) / 2;
-	hex2bin(key, from->outkey, from->outkeylength);
+	if(!hex2bin(key, from->outkey, from->outkeylength)) {
+		logger(LOG_ERR, "Got bad %s from %s(%s): %s", "ANS_KEY", from->name, from->hostname, "invalid key");
+		return true;
+	}
 
 	/* Check and lookup cipher and digest algorithms */