/*
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,
+ 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 1.1.4.26 2003/12/20 21:25:17 guus Exp $
+ $Id$
*/
#include "system.h"
-#include <openssl/evp.h>
-#include <openssl/err.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"
#include "utils.h"
#include "xalloc.h"
-bool mykeyused = false;
+static bool mykeyused = false;
-bool send_key_changed(connection_t *c, const node_t *n)
-{
+bool send_key_changed() {
cp();
/* 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)
-{
+bool key_changed_h(connection_t *c, char *request) {
char name[MAX_STRING_SIZE];
node_t *n;
cp();
- 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);
/* Tell the others */
if(!tunnelserver)
- forward_request(c);
+ forward_request(c, request);
return true;
}
-bool send_req_key(connection_t *c, const node_t *from, const node_t *to)
-{
+bool send_req_key(node_t *to) {
cp();
- return send_request(c, "%d %s %s", REQ_KEY, from->name, to->name);
+ 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;
cp();
- 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;
/* 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)
-{
- char key[MAX_STRING_SIZE];
+bool send_ans_key(node_t *to) {
+ size_t keylen = cipher_keylength(&myself->incipher);
+ char key[keylen * 2 + 1];
cp();
- bin2hex(from->key, key, from->keylength);
- key[from->keylength * 2] = '\0';
+ 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);
- return send_request(c, "%d %s %s %s %d %d %d %d", ANS_KEY,
- from->name, to->name, key,
- from->cipher ? from->cipher->nid : 0,
- from->digest ? from->digest->type : 0, from->maclength,
- from->compression);
+ 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);
}
-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];
cp();
- 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) {
logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY", c->name,
if(tunnelserver)
return false;
- return send_request(to->nexthop->connection, "%s", 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';
+ 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;
+ }
- from->status.validkey = true;
- from->status.waitingforkey = false;
- from->sent_seqno = 0;
+ return send_request(to->nexthop->connection, "%s", request);
+ }
/* Check and lookup cipher and digest algorithms */
- if(cipher) {
- from->cipher = EVP_get_cipherbynid(cipher);
-
- if(!from->cipher) {
- logger(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name,
- from->hostname);
- 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 false;
- }
- } else {
- from->cipher = 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->maclength = maclength;
-
- if(digest) {
- from->digest = EVP_get_digestbynid(digest);
+ if(strlen(key) / 2 != cipher_keylength(&from->outcipher)) {
+ logger(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
+ return false;
+ }
- if(!from->digest) {
- 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->maclength > from->digest->md_size || from->maclength < 0) {
- logger(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"),
- from->name, from->hostname);
- return false;
- }
- } else {
- from->digest = 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) {
return false;
}
- from->compression = compression;
+ from->outcompression = compression;
- 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;
- }
+ /* 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);
- flush_queue(from);
-
return true;
}
projects / meshlink / blobdiff