/*
protocol_key.c -- handle the meta-protocol, key exchange
- Copyright (C) 1999-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
+ Copyright (C) 1999-2005 Ivo Timmermans,
+ 2000-2009 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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: protocol_key.c,v 1.1.4.1 2002/02/11 10:05:58 guus Exp $
+ $Id$
*/
-#include "config.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <errno.h>
-
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
+#include "system.h"
-#include "conf.h"
+#include "splay_tree.h"
+#include "cipher.h"
+#include "connection.h"
+#include "crypto.h"
+#include "logger.h"
#include "net.h"
#include "netutl.h"
-#include "protocol.h"
-#include "meta.h"
-#include "connection.h"
#include "node.h"
-#include "edge.h"
-\
-#include "system.h"
+#include "protocol.h"
+#include "utils.h"
+#include "xalloc.h"
+
+static bool mykeyused = false;
-int mykeyused = 0;
-
-int send_key_changed(connection_t *c, node_t *n)
-{
- connection_t *other;
- avl_node_t *node;
-cp
- /* Only send this message if some other daemon requested our key previously.
- This reduces unnecessary key_changed broadcasts.
- */
-
- if(n == myself && !mykeyused)
- return 0;
-
- for(node = connection_tree->head; node; node = node->next)
- {
- other = (connection_t *)node->data;
- if(other->status.active && other->status.mst && other != c)
- send_request(other, "%d %s", KEY_CHANGED, n->name);
- }
-cp
- return 0;
+bool send_key_changed() {
+ cp();
+
+ /* Only send this message if some other daemon requested our key previously.
+ This reduces unnecessary key_changed broadcasts.
+ */
+
+ if(!mykeyused)
+ return true;
+
+ return send_request(broadcast, "%d %x %s", KEY_CHANGED, rand(), myself->name);
}
-int key_changed_h(connection_t *c)
-{
- char name[MAX_STRING_SIZE];
- node_t *n;
-cp
- if(sscanf(c->buffer, "%*d "MAX_STRING, name) != 1)
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
- c->name, c->hostname);
- return -1;
- }
-
- n = lookup_node(name);
-
- if(!n)
- {
- syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED",
- c->name, c->hostname, name);
- return -1;
- }
-
- n->status.validkey = 0;
- n->status.waitingforkey = 0;
- n->sent_seqno = 0;
-
- send_key_changed(c, n);
-cp
- return 0;
+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",
+ c->name, c->hostname);
+ return false;
+ }
+
+ if(seen_request(request))
+ return true;
+
+ n = lookup_node(name);
+
+ 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;
+ }
+
+ n->status.validkey = false;
+ n->status.waitingforkey = false;
+
+ /* Tell the others */
+
+ if(!tunnelserver)
+ forward_request(c, request);
+
+ return true;
}
-int send_req_key(connection_t *c, node_t *from, node_t *to)
-{
-cp
- return send_request(c, "%d %s %s", REQ_KEY,
- from->name, to->name);
+bool send_req_key(node_t *to) {
+ cp();
+
+ return send_request(to->nexthop->connection, "%d %s %s", REQ_KEY, myself->name, to->name);
}
-int req_key_h(connection_t *c)
-{
- char from_name[MAX_STRING_SIZE];
- char to_name[MAX_STRING_SIZE];
- node_t *from, *to;
-cp
- if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2)
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY",
- c->name, c->hostname);
- return -1;
- }
-
- from = lookup_node(from_name);
-
- if(!from)
- {
- syslog(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 -1;
- }
-
- to = lookup_node(to_name);
-
- if(!to)
- {
- syslog(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 -1;
- }
-
- /* Check if this key request is for us */
-
- if(to == myself) /* Yes, send our own key back */
- {
- mykeyused = 1;
- from->received_seqno = 0;
- send_ans_key(c, myself, from);
- }
- else
- {
-/* Proxy keys
- if(to->status.validkey)
- {
- send_ans_key(c, to, from);
- }
- else
-*/
- send_req_key(to->nexthop->connection, from, to);
- }
+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;
+
+ 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,
+ c->hostname);
+ 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;
+ }
+
+ 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"),
+ "REQ_KEY", c->name, c->hostname, to_name);
+ return false;
+ }
+
+ /* Check if this key request is for us */
+
+ if(to == myself) { /* Yes, send our own key back */
-cp
- return 0;
+ send_ans_key(from);
+ } else {
+ if(tunnelserver)
+ return false;
+
+ 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_request(to->nexthop->connection, "%s", request);
+ }
+
+ return true;
}
-int send_ans_key(connection_t *c, node_t *from, node_t *to)
-{
- char key[MAX_STRING_SIZE];
-cp
- bin2hex(from->key, key, from->keylength);
- key[from->keylength * 2] = '\0';
-cp
- return send_request(c, "%d %s %s %s %d %d %d", ANS_KEY,
- from->name, to->name, key, from->cipher?from->cipher->nid:0, from->digest?from->digest->type:0, from->maclength);
+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);
+
+ 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));
+
+ return send_request(to->nexthop->connection, "%d %s %s %s %d %d %d %d", ANS_KEY,
+ myself->name, to->name, key,
+ cipher_get_nid(&to->incipher),
+ digest_get_nid(&to->indigest),
+ digest_length(&to->indigest),
+ to->incompression);
}
-int ans_key_h(connection_t *c)
-{
- char from_name[MAX_STRING_SIZE];
- char to_name[MAX_STRING_SIZE];
- char key[MAX_STRING_SIZE];
- int cipher, digest, maclength;
- node_t *from, *to;
-cp
- if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d", from_name, to_name, key, &cipher, &digest, &maclength) != 6)
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY",
- c->name, c->hostname);
- return -1;
- }
-
- from = lookup_node(from_name);
-
- if(!from)
- {
- syslog(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 -1;
- }
-
- to = lookup_node(to_name);
-
- if(!to)
- {
- syslog(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 -1;
- }
-
- /* Forward it if necessary */
-
- if(to != myself)
- {
- return send_request(to->nexthop->connection, c->buffer);
- }
-
- /* Update our copy of the origin's packet key */
-
- if(from->key)
- free(from->key);
-
- from->key = xstrdup(key);
- from->keylength = strlen(key) / 2;
- hex2bin(from->key, from->key, from->keylength);
- from->key[from->keylength] = '\0';
-
- from->status.validkey = 1;
- from->status.waitingforkey = 0;
-
- /* Check and lookup cipher and digest algorithms */
-
- if(cipher)
- {
- from->cipher = EVP_get_cipherbynid(cipher);
- if(!from->cipher)
- {
- syslog(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
- return -1;
+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;
+ 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,
+ c->hostname);
+ return false;
}
- if(from->keylength != from->cipher->key_len + from->cipher->iv_len)
- {
- syslog(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
- return -1;
- }
- }
- else
- {
- from->cipher = NULL;
- }
-
- if(digest)
- {
- from->digest = EVP_get_digestbynid(digest);
- if(!from->digest)
- {
- syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname);
- return -1;
+
+ 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;
}
- from->maclength = maclength;
- if(from->maclength > from->digest->md_size || from->maclength < 0)
- {
- syslog(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname);
- return -1;
+
+ 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"),
+ "ANS_KEY", c->name, c->hostname, to_name);
+ return false;
}
- }
- else
- {
- from->digest = NULL;
- from->maclength = maclength;
- }
-
- flush_queue(from);
-cp
- return 0;
+
+ /* Forward it if necessary */
+
+ if(to != myself) {
+ if(tunnelserver)
+ return false;
+
+ 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->outcipher, cipher)) {
+ logger(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
+ return false;
+ }
+
+ if(strlen(key) / 2 != cipher_keylength(&from->outcipher)) {
+ logger(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), 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(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;
+ }
+
+ from->outcompression = compression;
+
+ /* Update our copy of the origin's packet key */
+
+ hex2bin(key, key, cipher_keylength(&from->outcipher));
+ cipher_set_key(&from->outcipher, key, false);
+
+ from->status.validkey = true;
+ from->status.waitingforkey = false;
+ from->sent_seqno = 0;
+
+ if(from->options & OPTION_PMTU_DISCOVERY && !from->mtuprobes)
+ send_mtu_probe(from);
+
+ return true;
}
projects / meshlink / blobdiff