X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fprotocol_key.c;h=069cfd5f8ff8dd26abb1b3fd1bbcc93faa9fdfff;hb=103543aa2c15d9f1e2aa313a2e593a7524cce484;hp=92948aa4d2f5571e94dc50c3427968a1cad89669;hpb=4c85542894f7fca823b119b05e07179deb24229a;p=tinc

diff --git a/src/protocol_key.c b/src/protocol_key.c
index 92948aa4..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,
-                  2000-2009 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
@@ -20,12 +20,10 @@
 
 #include "system.h"
 
-#include <openssl/evp.h>
-#include <openssl/err.h>
-#include <openssl/rand.h>
-
-#include "avl_tree.h"
+#include "splay_tree.h"
+#include "cipher.h"
 #include "connection.h"
+#include "crypto.h"
 #include "logger.h"
 #include "net.h"
 #include "netutl.h"
@@ -34,30 +32,34 @@
 #include "utils.h"
 #include "xalloc.h"
 
-bool mykeyused = false;
+static bool mykeyused = false;
 
-bool send_key_changed() {
-	/* Only send this message if some other daemon requested our key previously.
-	   This reduces unnecessary key_changed broadcasts.
-	 */
+void send_key_changed() {
+	avl_node_t *node;
+	connection_t *c;
 
-	if(!mykeyused)
-		return true;
+	send_request(broadcast, "%d %x %s", KEY_CHANGED, rand(), myself->name);
 
-	return send_request(broadcast, "%d %x %s", KEY_CHANGED, rand(), myself->name);
+	/* Immediately send new keys to directly connected nodes to keep UDP mappings alive */
+
+	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) {
+bool key_changed_h(connection_t *c, char *request) {
 	char name[MAX_STRING_SIZE];
 	node_t *n;
 
-	if(sscanf(c->buffer, "%*d %*x " MAX_STRING, name) != 1) {
+	if(sscanf(request, "%*d %*x " MAX_STRING, name) != 1) {
 		logger(LOG_ERR, "Got bad %s from %s (%s)", "KEY_CHANGED",
 			   c->name, c->hostname);
 		return false;
 	}
 
-	if(seen_request(c->buffer))
+	if(seen_request(request))
 		return true;
 
 	n = lookup_node(name);
@@ -65,16 +67,16 @@ bool key_changed_h(connection_t *c) {
 	if(!n) {
 		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 */
 
 	if(!tunnelserver)
-		forward_request(c);
+		forward_request(c, request);
 
 	return true;
 }
@@ -83,23 +85,28 @@ 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) {
+bool req_key_h(connection_t *c, char *request) {
 	char from_name[MAX_STRING_SIZE];
 	char to_name[MAX_STRING_SIZE];
 	node_t *from, *to;
 
-	if(sscanf(c->buffer, "%*d " MAX_STRING " " MAX_STRING, from_name, to_name) != 2) {
+	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,
 			   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",
 			   "REQ_KEY", c->name, c->hostname, from_name);
-		return false;
+		return true;
 	}
 
 	to = lookup_node(to_name);
@@ -107,16 +114,17 @@ bool req_key_h(connection_t *c) {
 	if(!to) {
 		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 */
+
 		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",
@@ -124,68 +132,68 @@ bool req_key_h(connection_t *c) {
 			return true;
 		}
 
-		send_request(to->nexthop->connection, "%s", c->buffer);
+		send_request(to->nexthop->connection, "%s", request);
 	}
 
 	return true;
 }
 
 bool send_ans_key(node_t *to) {
-	char *key;
+	size_t keylen = cipher_keylength(&myself->incipher);
+	char key[keylen * 2 + 1];
 
-	// Set key parameters
-	to->incipher = myself->incipher;
-	to->inkeylength = myself->inkeylength;
-	to->indigest = myself->indigest;
-	to->inmaclength = myself->inmaclength;
+	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;
 
-	// Allocate memory for key
-	to->inkey = xrealloc(to->inkey, to->inkeylength);
+	randomize(key, keylen);
+	cipher_set_key(&to->incipher, key, true);
+	digest_set_key(&to->indigest, key, keylen);
 
-	// Create a new key
-	RAND_pseudo_bytes((unsigned char *)to->inkey, to->inkeylength);
-	if(to->incipher)
-		EVP_DecryptInit_ex(&to->inctx, to->incipher, NULL, (unsigned char *)to->inkey, (unsigned char *)to->inkey + to->incipher->key_len);
+	bin2hex(key, key, keylen);
+	key[keylen * 2] = '\0';
 
 	// Reset sequence number and late packet window
 	mykeyused = true;
 	to->received_seqno = 0;
 	memset(to->late, 0, sizeof(to->late));
 
-	// Convert to hexadecimal and send
-	key = alloca(2 * to->inkeylength + 1);
-	bin2hex(to->inkey, key, to->inkeylength);
-	key[to->inkeylength * 2] = '\0';
-
-	return send_request(to->nexthop->connection, "%d %s %s %s %d %d %d %d", ANS_KEY,
-			myself->name, to->name, key,
-			to->incipher ? to->incipher->nid : 0,
-			to->indigest ? to->indigest->type : 0, to->inmaclength,
-			to->incompression);
+	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) {
+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;
 
-	if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d",
+	if(sscanf(request, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d",
 		from_name, to_name, key, &cipher, &digest, &maclength,
-		&compression) != 7) {
+		&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",
 			   "ANS_KEY", c->name, c->hostname, from_name);
-		return false;
+		return true;
 	}
 
 	to = lookup_node(to_name);
@@ -193,89 +201,71 @@ bool ans_key_h(connection_t *c) {
 	if(!to) {
 		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);
+				   "ANS_KEY", c->name, c->hostname, to_name);
 			return true;
 		}
 
-		return send_request(to->nexthop->connection, "%s", c->buffer);
+		return send_request(to->nexthop->connection, "%s", request);
 	}
 
-	/* 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);
-
-	from->status.waitingforkey = false;
 	/* Check and lookup cipher and digest algorithms */
 
-	if(cipher) {
-		from->outcipher = EVP_get_cipherbynid(cipher);
-
-		if(!from->outcipher) {
-			logger(LOG_ERR, "Node %s (%s) uses unknown cipher!", from->name,
-				   from->hostname);
-			return false;
-		}
-
-		if(from->outkeylength != from->outcipher->key_len + from->outcipher->iv_len) {
-			logger(LOG_ERR, "Node %s (%s) uses wrong keylength!", from->name,
-				   from->hostname);
-			return false;
-		}
-	} else {
-		from->outcipher = NULL;
+	if(!cipher_open_by_nid(&from->outcipher, cipher)) {
+		logger(LOG_ERR, "Node %s (%s) uses unknown cipher!", from->name, from->hostname);
+		return false;
 	}
 
-	from->outmaclength = maclength;
+	keylen = strlen(key) / 2;
 
-	if(digest) {
-		from->outdigest = EVP_get_digestbynid(digest);
+	if(keylen != cipher_keylength(&from->outcipher)) {
+		logger(LOG_ERR, "Node %s (%s) uses wrong keylength!", from->name, from->hostname);
+		return false;
+	}
 
-		if(!from->outdigest) {
-			logger(LOG_ERR, "Node %s (%s) uses unknown digest!", from->name,
-				   from->hostname);
-			return false;
-		}
+	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->outmaclength > from->outdigest->md_size || from->outmaclength < 0) {
-			logger(LOG_ERR, "Node %s (%s) uses bogus MAC length!",
-				   from->name, from->hostname);
-			return false;
-		}
-	} else {
-		from->outdigest = NULL;
+	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;
+		return true;
 	}
 	
 	from->outcompression = compression;
 
-	if(from->outcipher)
-		if(!EVP_EncryptInit_ex(&from->outctx, from->outcipher, NULL, (unsigned char *)from->outkey, (unsigned char *)from->outkey + from->outcipher->key_len)) {
-			logger(LOG_ERR, "Error during initialisation of key from %s (%s): %s",
-					from->name, from->hostname, ERR_error_string(ERR_get_error(), NULL));
-			return false;
-		}
+	/* Update our copy of the origin's packet key */
+
+	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);