--- /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;
+}
projects / tinc / blobdiff