/*
protocol_key.c -- handle the meta-protocol, key exchange
- Copyright (C) 1999-2003 Ivo Timmermans <ivo@o2w.nl>,
- 2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 1999-2005 Ivo Timmermans <ivo@tinc-vpn.org>,
+ 2000-2005 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 1.1.4.19 2003/07/17 15:06:26 guus Exp $
+ $Id$
*/
#include "system.h"
+#include <openssl/evp.h>
+#include <openssl/err.h>
+
#include "avl_tree.h"
#include "connection.h"
#include "logger.h"
#include "utils.h"
#include "xalloc.h"
-int mykeyused = 0;
+bool mykeyused = false;
-int send_key_changed(connection_t *c, node_t *n)
+bool send_key_changed(connection_t *c, const node_t *n)
{
cp();
*/
if(n == myself && !mykeyused)
- return 0;
+ return true;
return send_request(c, "%d %lx %s", KEY_CHANGED, random(), n->name);
}
-int key_changed_h(connection_t *c)
+bool key_changed_h(connection_t *c)
{
char name[MAX_STRING_SIZE];
node_t *n;
if(sscanf(c->buffer, "%*d %*x " MAX_STRING, name) != 1) {
logger(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
c->name, c->hostname);
- return -1;
+ return false;
}
if(seen_request(c->buffer))
- return 0;
+ 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 -1;
+ return false;
}
- n->status.validkey = 0;
- n->status.waitingforkey = 0;
+ n->status.validkey = false;
+ n->status.waitingforkey = false;
/* Tell the others */
- forward_request(c);
+ if(!tunnelserver)
+ forward_request(c);
- return 0;
+ return true;
}
-int send_req_key(connection_t *c, node_t *from, node_t *to)
+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);
}
-int req_key_h(connection_t *c)
+bool req_key_h(connection_t *c)
{
char from_name[MAX_STRING_SIZE];
char to_name[MAX_STRING_SIZE];
if(sscanf(c->buffer, "%*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 -1;
+ 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 -1;
+ 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 -1;
+ return false;
}
/* Check if this key request is for us */
if(to == myself) { /* Yes, send our own key back */
- mykeyused = 1;
+ mykeyused = true;
from->received_seqno = 0;
memset(from->late, 0, sizeof(from->late));
send_ans_key(c, myself, from);
} else {
+ if(tunnelserver)
+ return false;
+
send_req_key(to->nexthop->connection, from, to);
}
- return 0;
+ return true;
}
-int send_ans_key(connection_t *c, node_t *from, node_t *to)
+bool send_ans_key(connection_t *c, const node_t *from, const node_t *to)
{
- char key[MAX_STRING_SIZE];
+ char *key;
cp();
+ key = alloca(2 * from->keylength + 1);
bin2hex(from->key, key, from->keylength);
key[from->keylength * 2] = '\0';
from->compression);
}
-int ans_key_h(connection_t *c)
+bool ans_key_h(connection_t *c)
{
char from_name[MAX_STRING_SIZE];
char to_name[MAX_STRING_SIZE];
&compression) != 7) {
logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY", c->name,
c->hostname);
- return -1;
+ 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 -1;
+ 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"),
"ANS_KEY", c->name, c->hostname, to_name);
- return -1;
+ return false;
}
/* Forward it if necessary */
if(to != myself) {
+ if(tunnelserver)
+ return false;
+
return send_request(to->nexthop->connection, "%s", c->buffer);
}
hex2bin(from->key, from->key, from->keylength);
from->key[from->keylength] = '\0';
- from->status.validkey = 1;
- from->status.waitingforkey = 0;
+ from->status.validkey = true;
+ from->status.waitingforkey = false;
from->sent_seqno = 0;
/* Check and lookup cipher and digest algorithms */
if(!from->cipher) {
logger(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name,
from->hostname);
- return -1;
+ return false;
}
if(from->keylength != from->cipher->key_len + from->cipher->iv_len) {
logger(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name,
from->hostname);
- return -1;
+ return false;
}
} else {
from->cipher = NULL;
if(!from->digest) {
logger(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name,
from->hostname);
- return -1;
+ return false;
}
if(from->maclength > from->digest->md_size || from->maclength < 0) {
logger(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"),
from->name, from->hostname);
- return -1;
+ return false;
}
} else {
from->digest = NULL;
if(compression < 0 || compression > 11) {
logger(LOG_ERR, _("Node %s (%s) uses bogus compression level!"), from->name, from->hostname);
- return -1;
+ return false;
}
from->compression = compression;
- EVP_EncryptInit_ex(&from->packet_ctx, from->cipher, NULL, from->key, from->key + from->cipher->key_len);
+ if(from->cipher)
+ if(!EVP_EncryptInit_ex(&from->packet_ctx, from->cipher, NULL, from->key, from->key + from->cipher->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;
+ }
+
+ if(from->options & OPTION_PMTU_DISCOVERY && !from->mtuprobes)
+ send_mtu_probe(from);
flush_queue(from);
- return 0;
+ return true;
}
projects / tinc / blobdiff