/*
protocol_key.c -- handle the meta-protocol, key exchange
Copyright (C) 1999-2005 Ivo Timmermans,
- 2000-2006 Guus Sliepen <guus@tinc-vpn.org>
+ 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
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"
#include "splay_tree.h"
#include "cipher.h"
#include "connection.h"
+#include "crypto.h"
#include "logger.h"
#include "net.h"
#include "netutl.h"
static bool mykeyused = false;
-bool send_key_changed(connection_t *c, const node_t *n) {
- cp();
-
+bool send_key_changed() {
/* Only send this message if some other daemon requested our key previously.
This reduces unnecessary key_changed broadcasts.
*/
- if(n == myself && !mykeyused)
+ if(!mykeyused)
return true;
- return send_request(c, "%d %lx %s", KEY_CHANGED, random(), n->name);
+ return send_request(broadcast, "%d %x %s", KEY_CHANGED, rand(), myself->name);
}
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;
}
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;
}
-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) {
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;
}
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;
}
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;
}
/* 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;
- send_req_key(to->nexthop->connection, from, to);
+ 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;
}
-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);
- 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) {
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,
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "ANS_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"),
+ 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;
}
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;
}
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->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);
+ if(strlen(key) / 2 != 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);
+ logger(LOG_ERR, "Node %s (%s) uses bogus compression level!", from->name, from->hostname);
return false;
}
- 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, cipher_keylength(&from->outcipher));
+ cipher_set_key(&from->outcipher, key, false);
from->status.validkey = true;
from->status.waitingforkey = false;
if(from->options & OPTION_PMTU_DISCOVERY && !from->mtuprobes)
send_mtu_probe(from);
- flush_queue(from);
-
return true;
}
projects / tinc / blobdiff