+++ /dev/null
-/*
- 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>
-
- 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
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- 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: protocol_key.c,v 1.1 2002/04/28 12:46:26 zarq Exp $
-*/
-
-#include "config.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <errno.h>
-
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
-
-#include "conf.h"
-#include "interface.h"
-#include "net.h"
-#include "netutl.h"
-#include "protocol.h"
-#include "meta.h"
-#include "connection.h"
-#include "node.h"
-#include "edge.h"
-#include "logging.h"
-
-#include "system.h"
-
-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 != c)
- send_request(other, "%d %lx %s", KEY_CHANGED, random(), n->name);
- }
-cp
- return 0;
-}
-
-int key_changed_h(connection_t *c)
-{
- char name[MAX_STRING_SIZE];
- avl_node_t *node;
- connection_t *other;
- node_t *n;
-cp
- if(sscanf(c->buffer, "%*d %*x "MAX_STRING, name) != 1)
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
- c->name, c->hostname);
- return -1;
- }
-
- if(seen_request(c->buffer))
- return 0;
-
- 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;
-
- /* Tell the others */
-
- for(node = connection_tree->head; node; node = node->next)
- {
- other = (connection_t *)node->data;
- if(other->status.active && other != c)
- send_request(other, "%s", c->buffer);
- }
-cp
- return 0;
-}
-
-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);
-}
-
-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);
- }
-
-cp
- return 0;
-}
-
-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 %d", ANS_KEY,
- from->name, to->name, key, from->cipher?from->cipher->nid:0, from->digest?from->digest->type:0, from->maclength, from->compression);
-}
-
-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, compression;
- node_t *from, *to;
-cp
- if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d", from_name, to_name, key, &cipher, &digest, &maclength, &compression) != 7)
- {
- 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, "%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';
-
- 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;
- }
- 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;
- }
-
- from->maclength = maclength;
-
- 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;
- }
- 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;
- }
- }
- else
- {
- from->digest = NULL;
- }
-
- from->compression = compression;
-cp
- return 0;
-}
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