2000-03-26 00:33:07 +00:00
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/*
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protocol.c -- handle the meta-protocol
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2001-01-07 17:09:07 +00:00
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Copyright (C) 1999-2001 Ivo Timmermans <itimmermans@bigfoot.com>,
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2000,2001 Guus Sliepen <guus@sliepen.warande.net>
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2000-03-26 00:33:07 +00:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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2000-05-29 21:01:26 +00:00
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2001-07-19 12:29:40 +00:00
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$Id: protocol.c,v 1.28.4.100 2001/07/19 12:29:40 guus Exp $
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2000-03-26 00:33:07 +00:00
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*/
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#include "config.h"
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2000-05-04 23:17:02 +00:00
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#include <sys/types.h>
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2000-03-26 00:33:07 +00:00
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <sys/socket.h>
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2000-04-26 17:42:55 +00:00
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#include <unistd.h>
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2000-05-01 18:07:12 +00:00
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#include <stdio.h>
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2000-11-15 13:33:27 +00:00
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#include <stdarg.h>
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2001-02-25 11:09:29 +00:00
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#include <errno.h>
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2000-03-26 00:33:07 +00:00
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#include <utils.h>
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#include <xalloc.h>
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2001-01-05 23:53:53 +00:00
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#include <avl_tree.h>
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2001-01-07 15:25:49 +00:00
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#include <list.h>
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2000-03-26 00:33:07 +00:00
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2000-08-07 16:27:29 +00:00
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#include <netinet/in.h>
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2001-07-04 08:41:36 +00:00
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#include <openssl/sha.h>
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#include <openssl/rand.h>
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#include <openssl/evp.h>
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2000-11-15 01:06:13 +00:00
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2001-07-04 08:41:36 +00:00
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#ifndef HAVE_RAND_PSEUDO_BYTES
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#define RAND_pseudo_bytes RAND_bytes
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2000-11-15 01:06:13 +00:00
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#endif
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2000-03-26 00:33:07 +00:00
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#include "conf.h"
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#include "net.h"
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#include "netutl.h"
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#include "protocol.h"
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2000-09-26 14:06:11 +00:00
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#include "meta.h"
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2000-11-20 19:12:17 +00:00
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#include "connection.h"
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2000-03-26 00:33:07 +00:00
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2000-05-29 21:01:26 +00:00
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#include "system.h"
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2001-05-24 21:52:26 +00:00
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int mykeyused = 0;
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2000-09-15 12:58:40 +00:00
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int check_id(char *id)
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{
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int i;
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for (i = 0; i < strlen(id); i++)
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2000-10-15 00:59:37 +00:00
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if(!isalnum(id[i]) && id[i] != '_')
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return -1;
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2000-12-05 08:59:30 +00:00
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2000-10-15 00:59:37 +00:00
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return 0;
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2000-09-15 12:58:40 +00:00
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}
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2000-12-05 08:59:30 +00:00
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/* Generic request routines - takes care of logging and error
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detection as well */
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2000-05-01 18:07:12 +00:00
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2000-11-20 19:12:17 +00:00
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int send_request(connection_t *cl, const char *format, ...)
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2000-03-26 00:33:07 +00:00
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{
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2000-09-10 15:18:03 +00:00
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va_list args;
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2000-10-15 00:59:37 +00:00
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char buffer[MAXBUFSIZE];
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int len, request;
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2000-09-17 21:42:05 +00:00
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2000-04-25 18:57:23 +00:00
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cp
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2000-12-05 08:59:30 +00:00
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/* Use vsnprintf instead of vasprintf: faster, no memory
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fragmentation, cleanup is automatic, and there is a limit on the
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input buffer anyway */
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2000-09-10 15:18:03 +00:00
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2000-10-15 00:59:37 +00:00
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va_start(args, format);
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len = vsnprintf(buffer, MAXBUFSIZE, format, args);
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request = va_arg(args, int);
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2000-09-10 15:18:03 +00:00
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va_end(args);
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2000-03-26 00:33:07 +00:00
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2000-10-15 00:59:37 +00:00
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if(len < 0 || len > MAXBUFSIZE-1)
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2000-09-10 15:18:03 +00:00
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{
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2000-09-17 21:42:05 +00:00
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syslog(LOG_ERR, _("Output buffer overflow while sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
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2000-09-10 15:18:03 +00:00
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return -1;
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}
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2000-09-22 16:20:07 +00:00
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if(debug_lvl >= DEBUG_PROTOCOL)
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2001-05-25 11:54:28 +00:00
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{
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if(debug_lvl >= DEBUG_META)
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syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], cl->name, cl->hostname, buffer);
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else
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syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
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}
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2000-10-15 00:59:37 +00:00
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2001-05-25 11:54:28 +00:00
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buffer[len++] = '\n';
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2000-09-22 16:20:07 +00:00
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cp
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2000-10-11 22:01:02 +00:00
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return send_meta(cl, buffer, len);
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2000-09-22 16:20:07 +00:00
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}
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2000-11-20 19:12:17 +00:00
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int receive_request(connection_t *cl)
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2000-09-22 16:20:07 +00:00
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{
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2000-09-26 14:06:11 +00:00
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int request;
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2001-05-25 11:54:28 +00:00
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cp
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2000-09-26 14:06:11 +00:00
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if(sscanf(cl->buffer, "%d", &request) == 1)
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2000-09-10 15:18:03 +00:00
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{
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2001-03-04 13:59:32 +00:00
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if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
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2000-09-26 14:06:11 +00:00
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{
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2001-05-25 11:54:28 +00:00
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if(debug_lvl >= DEBUG_META)
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syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
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cl->name, cl->hostname, cl->buffer);
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else
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syslog(LOG_ERR, _("Unknown request from %s (%s)"),
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cl->name, cl->hostname);
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2000-09-26 14:06:11 +00:00
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return -1;
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}
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else
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{
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2000-10-21 11:52:08 +00:00
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if(debug_lvl >= DEBUG_PROTOCOL)
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2001-05-25 11:54:28 +00:00
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{
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if(debug_lvl >= DEBUG_META)
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syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"),
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request_name[request], cl->name, cl->hostname, cl->buffer);
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else
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syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
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request_name[request], cl->name, cl->hostname);
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}
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2000-09-26 14:06:11 +00:00
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}
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2000-10-29 00:02:20 +00:00
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2000-10-29 01:08:09 +00:00
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if((cl->allow_request != ALL) && (cl->allow_request != request))
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{
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syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), cl->name, cl->hostname);
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return -1;
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}
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2000-09-26 14:06:11 +00:00
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if(request_handlers[request](cl))
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/* Something went wrong. Probably scriptkiddies. Terminate. */
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{
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syslog(LOG_ERR, _("Error while processing %s from %s (%s)"),
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request_name[request], cl->name, cl->hostname);
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return -1;
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}
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2000-09-10 15:18:03 +00:00
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}
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2000-09-26 14:06:11 +00:00
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else
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2000-03-26 00:33:07 +00:00
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{
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2000-09-26 14:06:11 +00:00
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syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
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cl->name, cl->hostname);
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2000-03-26 00:33:07 +00:00
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return -1;
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}
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2000-10-29 00:02:20 +00:00
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cp
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return 0;
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2000-09-10 15:18:03 +00:00
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}
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2001-05-25 11:54:28 +00:00
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/* The authentication protocol is described in detail in doc/SECURITY2,
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the rest will be described in doc/PROTOCOL. */
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2000-09-10 15:18:03 +00:00
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2000-11-20 19:12:17 +00:00
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int send_id(connection_t *cl)
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2000-09-10 15:18:03 +00:00
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{
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2000-04-25 18:57:23 +00:00
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cp
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2000-10-16 19:04:47 +00:00
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return send_request(cl, "%d %s %d %lx %hd", ID, myself->name, myself->protocol_version, myself->options, myself->port);
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2000-09-10 15:18:03 +00:00
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}
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2000-11-20 19:12:17 +00:00
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int id_h(connection_t *cl)
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2000-09-10 15:18:03 +00:00
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{
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2000-11-22 19:55:53 +00:00
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char name[MAX_STRING_SIZE];
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2000-09-10 15:18:03 +00:00
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cp
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2001-07-15 18:07:31 +00:00
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if(sscanf(cl->buffer, "%*d "MAX_STRING" %d %lx %hd", name, &cl->protocol_version, &cl->options, &cl->port) != 4)
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2000-09-10 15:18:03 +00:00
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{
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syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname);
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return -1;
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}
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2000-09-17 21:42:05 +00:00
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2000-09-10 22:49:46 +00:00
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/* Check if version matches */
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2000-09-17 21:42:05 +00:00
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2000-09-14 21:51:21 +00:00
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if(cl->protocol_version != myself->protocol_version)
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2000-09-10 15:18:03 +00:00
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{
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2000-09-14 21:51:21 +00:00
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syslog(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"),
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2000-09-17 21:42:05 +00:00
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cl->name, cl->hostname, cl->protocol_version);
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2000-09-10 15:18:03 +00:00
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return -1;
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}
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/* Check if identity is a valid name */
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2000-09-17 21:42:05 +00:00
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2000-11-22 19:55:53 +00:00
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if(check_id(name))
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2000-09-10 15:18:03 +00:00
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{
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syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname);
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return -1;
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}
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2000-11-22 19:55:53 +00:00
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/* Copy string to cl */
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2001-06-05 16:09:55 +00:00
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if(cl->name)
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free(cl->name);
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2000-11-22 19:55:53 +00:00
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cl->name = xstrdup(name);
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2000-09-17 21:42:05 +00:00
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2000-09-10 15:18:03 +00:00
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/* Load information about peer */
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2000-11-22 18:54:08 +00:00
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2000-10-16 16:33:30 +00:00
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if(read_host_config(cl))
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2000-09-10 15:18:03 +00:00
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{
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2000-09-14 21:51:21 +00:00
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syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->name);
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2000-09-10 15:18:03 +00:00
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return -1;
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}
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2001-02-25 19:09:45 +00:00
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/* Read in the public key, so that we can send a metakey */
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2000-11-22 18:54:08 +00:00
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2000-12-22 21:34:24 +00:00
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if(read_rsa_public_key(cl))
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return -1;
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2001-02-25 19:09:45 +00:00
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cl->allow_request = METAKEY;
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2000-09-10 15:18:03 +00:00
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cp
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2001-02-25 19:09:45 +00:00
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return send_metakey(cl);
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2000-09-10 15:18:03 +00:00
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}
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2001-02-27 16:37:31 +00:00
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int ack_h(connection_t *cl)
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{
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config_t const *cfg;
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connection_t *old, *p;
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subnet_t *subnet;
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avl_node_t *node, *node2;
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cp
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/* Okay, before we active the connection, we check if there is another entry
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in the connection list with the same name. If so, it presumably is an
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old connection that has timed out but we don't know it yet.
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*/
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2001-07-15 18:07:31 +00:00
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if((old = lookup_id(cl->name)))
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2001-02-27 16:37:31 +00:00
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{
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if(debug_lvl >= DEBUG_CONNECTIONS)
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2001-07-15 18:07:31 +00:00
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syslog(LOG_NOTICE, _("Removing old connection for %s at %s in favour of new connection from %s"),
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cl->name, old->hostname, cl->hostname);
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if(old->status.outgoing)
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{
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cl->status.outgoing = 1;
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old->status.outgoing = 0;
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}
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2001-02-27 16:37:31 +00:00
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terminate_connection(old);
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2001-07-15 18:07:31 +00:00
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return 0;
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2001-02-27 16:37:31 +00:00
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}
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2001-07-15 18:07:31 +00:00
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/* Now we can add the name to the id tree */
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id_add(cl);
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2001-02-27 16:37:31 +00:00
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2001-07-15 18:07:31 +00:00
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/* Also check if no other tinc daemon uses the same IP and port for UDP traffic */
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old = avl_search(active_tree, cl);
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if(old)
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{
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syslog(LOG_ERR, _("%s is listening on %s:%hd, which is already in use by %s!"),
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cl->name, cl->hostname, cl->port, old->name);
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return -1;
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}
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2001-02-27 16:37:31 +00:00
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/* Activate this connection */
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cl->allow_request = ALL;
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cl->status.active = 1;
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cl->nexthop = cl;
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cl->cipher_pkttype = EVP_bf_cbc();
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cl->cipher_pktkeylength = cl->cipher_pkttype->key_len + cl->cipher_pkttype->iv_len;
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2001-07-15 18:07:31 +00:00
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active_add(cl);
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2001-02-27 16:37:31 +00:00
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if(debug_lvl >= DEBUG_CONNECTIONS)
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syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
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2001-06-08 18:02:10 +00:00
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if(cl->status.outgoing)
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seconds_till_retry = 5; /* Reset retry timeout */
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2001-02-27 16:37:31 +00:00
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cp
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/* Check some options */
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if((cfg = get_config_val(cl->config, config_indirectdata)))
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{
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|
if(cfg->data.val == stupid_true)
|
|
|
|
cl->options |= OPTION_INDIRECT;
|
|
|
|
}
|
|
|
|
|
|
|
|
if((cfg = get_config_val(cl->config, config_tcponly)))
|
|
|
|
{
|
|
|
|
if(cfg->data.val == stupid_true)
|
|
|
|
cl->options |= OPTION_TCPONLY;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Send him our subnets */
|
|
|
|
|
|
|
|
for(node = myself->subnet_tree->head; node; node = node->next)
|
|
|
|
{
|
|
|
|
subnet = (subnet_t *)node->data;
|
|
|
|
send_add_subnet(cl, subnet);
|
|
|
|
}
|
2001-03-13 21:33:31 +00:00
|
|
|
|
2001-02-27 16:37:31 +00:00
|
|
|
/* And send him all the hosts and their subnets we know... */
|
|
|
|
|
2001-07-19 12:29:40 +00:00
|
|
|
for(node = active_tree->head; node; node = node->next)
|
2001-02-27 16:37:31 +00:00
|
|
|
{
|
|
|
|
p = (connection_t *)node->data;
|
|
|
|
|
|
|
|
if(p != cl && p->status.active)
|
|
|
|
{
|
|
|
|
/* Notify others of this connection */
|
|
|
|
|
|
|
|
if(p->status.meta)
|
|
|
|
send_add_host(p, cl);
|
|
|
|
|
|
|
|
/* Notify new connection of everything we know */
|
|
|
|
|
|
|
|
send_add_host(cl, p);
|
|
|
|
|
|
|
|
for(node2 = p->subnet_tree->head; node2; node2 = node2->next)
|
|
|
|
{
|
|
|
|
subnet = (subnet_t *)node2->data;
|
|
|
|
send_add_subnet(cl, subnet);
|
|
|
|
}
|
|
|
|
}
|
2001-07-19 12:29:40 +00:00
|
|
|
}
|
2001-02-27 16:37:31 +00:00
|
|
|
cp
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_challenge(connection_t *cl)
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
2000-10-20 15:34:38 +00:00
|
|
|
char *buffer;
|
|
|
|
int len, x;
|
2000-09-10 15:18:03 +00:00
|
|
|
cp
|
2001-02-25 19:09:45 +00:00
|
|
|
/* CHECKME: what is most reasonable value for len? */
|
|
|
|
|
2000-10-20 15:34:38 +00:00
|
|
|
len = RSA_size(cl->rsa_key);
|
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
/* Allocate buffers for the challenge */
|
2000-09-10 15:18:03 +00:00
|
|
|
|
2000-10-20 15:34:38 +00:00
|
|
|
buffer = xmalloc(len*2+1);
|
|
|
|
|
|
|
|
if(cl->hischallenge)
|
|
|
|
free(cl->hischallenge);
|
|
|
|
|
|
|
|
cl->hischallenge = xmalloc(len);
|
2000-10-15 00:59:37 +00:00
|
|
|
cp
|
2000-09-22 15:06:28 +00:00
|
|
|
/* Copy random data to the buffer */
|
2000-09-14 11:54:51 +00:00
|
|
|
|
2000-10-20 15:34:38 +00:00
|
|
|
RAND_bytes(cl->hischallenge, len);
|
|
|
|
|
2000-10-15 00:59:37 +00:00
|
|
|
cp
|
2001-02-25 19:09:45 +00:00
|
|
|
/* Convert to hex */
|
2000-09-10 15:18:03 +00:00
|
|
|
|
2001-02-25 19:09:45 +00:00
|
|
|
bin2hex(cl->hischallenge, buffer, len);
|
2000-10-20 15:34:38 +00:00
|
|
|
buffer[len*2] = '\0';
|
2001-02-25 19:09:45 +00:00
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
cp
|
2000-09-10 15:18:03 +00:00
|
|
|
/* Send the challenge */
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-10-20 15:34:38 +00:00
|
|
|
x = send_request(cl, "%d %s", CHALLENGE, buffer);
|
|
|
|
free(buffer);
|
2000-09-10 15:18:03 +00:00
|
|
|
cp
|
2000-10-20 15:34:38 +00:00
|
|
|
return x;
|
2000-09-10 15:18:03 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int challenge_h(connection_t *cl)
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
2000-11-22 19:55:53 +00:00
|
|
|
char buffer[MAX_STRING_SIZE];
|
2000-10-20 15:34:38 +00:00
|
|
|
int len;
|
2000-09-10 15:18:03 +00:00
|
|
|
cp
|
2000-11-22 19:55:53 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING, buffer) != 1)
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->name, cl->hostname);
|
2000-09-10 15:18:03 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2000-10-20 15:34:38 +00:00
|
|
|
len = RSA_size(myself->rsa_key);
|
|
|
|
|
2000-09-10 15:18:03 +00:00
|
|
|
/* Check if the length of the challenge is all right */
|
|
|
|
|
2000-10-20 15:34:38 +00:00
|
|
|
if(strlen(buffer) != len*2)
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Intruder: wrong challenge length from %s (%s)"), cl->name, cl->hostname);
|
2000-09-10 15:18:03 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
/* Allocate buffers for the challenge */
|
2000-09-10 15:18:03 +00:00
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
if(!cl->mychallenge)
|
2000-10-20 15:34:38 +00:00
|
|
|
cl->mychallenge = xmalloc(len);
|
2000-09-10 15:18:03 +00:00
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
/* Convert the challenge from hexadecimal back to binary */
|
2000-09-10 15:18:03 +00:00
|
|
|
|
2001-02-25 19:09:45 +00:00
|
|
|
hex2bin(buffer,cl->mychallenge,len);
|
2000-10-20 15:34:38 +00:00
|
|
|
|
2001-02-25 19:09:45 +00:00
|
|
|
cl->allow_request = CHAL_REPLY;
|
2000-10-21 11:52:08 +00:00
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
/* Rest is done by send_chal_reply() */
|
|
|
|
cp
|
|
|
|
return send_chal_reply(cl);
|
|
|
|
}
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_chal_reply(connection_t *cl)
|
2000-09-22 15:06:28 +00:00
|
|
|
{
|
|
|
|
char hash[SHA_DIGEST_LENGTH*2+1];
|
|
|
|
cp
|
|
|
|
if(!cl->mychallenge)
|
2000-09-14 11:54:51 +00:00
|
|
|
{
|
2000-09-22 15:06:28 +00:00
|
|
|
syslog(LOG_ERR, _("Trying to send CHAL_REPLY to %s (%s) without a valid CHALLENGE"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
2000-09-14 11:54:51 +00:00
|
|
|
}
|
2000-09-22 15:06:28 +00:00
|
|
|
|
|
|
|
/* Calculate the hash from the challenge we received */
|
2000-09-14 11:54:51 +00:00
|
|
|
|
2000-10-20 15:34:38 +00:00
|
|
|
SHA1(cl->mychallenge, RSA_size(myself->rsa_key), hash);
|
2000-09-10 15:18:03 +00:00
|
|
|
|
|
|
|
/* Convert the hash to a hexadecimal formatted string */
|
|
|
|
|
2000-09-14 21:51:21 +00:00
|
|
|
bin2hex(hash,hash,SHA_DIGEST_LENGTH);
|
|
|
|
hash[SHA_DIGEST_LENGTH*2] = '\0';
|
2000-09-10 15:18:03 +00:00
|
|
|
|
|
|
|
/* Send the reply */
|
|
|
|
|
|
|
|
cp
|
2000-09-22 15:06:28 +00:00
|
|
|
return send_request(cl, "%d %s", CHAL_REPLY, hash);
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
2000-09-10 15:18:03 +00:00
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int chal_reply_h(connection_t *cl)
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
2000-11-22 19:55:53 +00:00
|
|
|
char hishash[MAX_STRING_SIZE];
|
2000-09-22 15:06:28 +00:00
|
|
|
char myhash[SHA_DIGEST_LENGTH];
|
2000-09-10 15:18:03 +00:00
|
|
|
cp
|
2000-11-22 19:55:53 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING, hishash) != 1)
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->name, cl->hostname);
|
2000-09-10 15:18:03 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if the length of the hash is all right */
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
if(strlen(hishash) != SHA_DIGEST_LENGTH*2)
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->name, cl->hostname);
|
2000-09-10 15:18:03 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-09-10 15:18:03 +00:00
|
|
|
/* Convert the hash to binary format */
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
hex2bin(hishash, hishash, SHA_DIGEST_LENGTH);
|
|
|
|
|
|
|
|
/* Calculate the hash from the challenge we sent */
|
|
|
|
|
2000-10-20 15:34:38 +00:00
|
|
|
SHA1(cl->hischallenge, RSA_size(cl->rsa_key), myhash);
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-09-10 15:18:03 +00:00
|
|
|
/* Verify the incoming hash with the calculated hash */
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-10-16 16:33:30 +00:00
|
|
|
if(memcmp(hishash, myhash, SHA_DIGEST_LENGTH))
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname);
|
2000-10-21 11:52:08 +00:00
|
|
|
if(debug_lvl >= DEBUG_SCARY_THINGS)
|
|
|
|
{
|
|
|
|
bin2hex(myhash, hishash, SHA_DIGEST_LENGTH);
|
|
|
|
hishash[SHA_DIGEST_LENGTH*2] = '\0';
|
|
|
|
syslog(LOG_DEBUG, _("Expected challenge reply: %s"), hishash);
|
|
|
|
}
|
2000-09-10 15:18:03 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Identity has now been positively verified.
|
2001-02-25 19:09:45 +00:00
|
|
|
ack_h() handles the rest from now on.
|
2000-09-10 15:18:03 +00:00
|
|
|
*/
|
|
|
|
cp
|
2001-02-25 19:09:45 +00:00
|
|
|
return ack_h(cl);
|
2000-09-10 15:18:03 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_metakey(connection_t *cl)
|
2000-10-29 22:55:15 +00:00
|
|
|
{
|
|
|
|
char *buffer;
|
|
|
|
int len, x;
|
|
|
|
cp
|
|
|
|
len = RSA_size(cl->rsa_key);
|
|
|
|
|
|
|
|
/* Allocate buffers for the meta key */
|
|
|
|
|
|
|
|
buffer = xmalloc(len*2+1);
|
|
|
|
|
|
|
|
if(!cl->cipher_outkey)
|
|
|
|
cl->cipher_outkey = xmalloc(len);
|
|
|
|
|
|
|
|
if(!cl->cipher_outctx)
|
|
|
|
cl->cipher_outctx = xmalloc(sizeof(*cl->cipher_outctx));
|
|
|
|
cp
|
|
|
|
/* Copy random data to the buffer */
|
|
|
|
|
|
|
|
RAND_bytes(cl->cipher_outkey, len);
|
|
|
|
|
2001-03-02 11:25:56 +00:00
|
|
|
/* The message we send must be smaller than the modulus of the RSA key.
|
|
|
|
By definition, for a key of k bits, the following formula holds:
|
|
|
|
|
|
|
|
2^(k-1) <= modulus < 2^(k)
|
|
|
|
|
|
|
|
Where ^ means "to the power of", not "xor".
|
|
|
|
This means that to be sure, we must choose our message < 2^(k-1).
|
|
|
|
This can be done by setting the most significant bit to zero.
|
|
|
|
*/
|
|
|
|
|
|
|
|
cl->cipher_outkey[0] &= 0x7F;
|
2001-02-26 11:37:20 +00:00
|
|
|
|
2000-10-29 22:55:15 +00:00
|
|
|
if(debug_lvl >= DEBUG_SCARY_THINGS)
|
|
|
|
{
|
|
|
|
bin2hex(cl->cipher_outkey, buffer, len);
|
|
|
|
buffer[len*2] = '\0';
|
|
|
|
syslog(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"), buffer);
|
|
|
|
}
|
|
|
|
|
2001-03-02 11:25:56 +00:00
|
|
|
/* Encrypt the random data
|
|
|
|
|
|
|
|
We do not use one of the PKCS padding schemes here.
|
|
|
|
This is allowed, because we encrypt a totally random string
|
|
|
|
with a length equal to that of the modulus of the RSA key.
|
|
|
|
*/
|
2000-10-29 22:55:15 +00:00
|
|
|
|
2001-03-02 11:25:56 +00:00
|
|
|
if(RSA_public_encrypt(len, cl->cipher_outkey, buffer, cl->rsa_key, RSA_NO_PADDING) != len)
|
2000-10-29 22:55:15 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), cl->name, cl->hostname);
|
|
|
|
free(buffer);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
cp
|
|
|
|
/* Convert the encrypted random data to a hexadecimal formatted string */
|
|
|
|
|
|
|
|
bin2hex(buffer, buffer, len);
|
|
|
|
buffer[len*2] = '\0';
|
|
|
|
|
|
|
|
/* Send the meta key */
|
|
|
|
|
|
|
|
x = send_request(cl, "%d %s", METAKEY, buffer);
|
|
|
|
free(buffer);
|
|
|
|
|
2001-02-25 19:09:45 +00:00
|
|
|
/* Further outgoing requests are encrypted with the key we just generated */
|
|
|
|
|
2001-02-26 11:37:20 +00:00
|
|
|
EVP_EncryptInit(cl->cipher_outctx, EVP_bf_cfb(),
|
|
|
|
cl->cipher_outkey + len - EVP_bf_cfb()->key_len,
|
|
|
|
cl->cipher_outkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len);
|
2001-02-25 19:09:45 +00:00
|
|
|
|
|
|
|
cl->status.encryptout = 1;
|
2000-10-29 22:55:15 +00:00
|
|
|
cp
|
|
|
|
return x;
|
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int metakey_h(connection_t *cl)
|
2000-10-29 22:55:15 +00:00
|
|
|
{
|
2000-11-22 19:55:53 +00:00
|
|
|
char buffer[MAX_STRING_SIZE];
|
2000-10-29 22:55:15 +00:00
|
|
|
int len;
|
|
|
|
cp
|
2000-11-22 19:55:53 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING, buffer) != 1)
|
2000-10-29 22:55:15 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Got bad METAKEY from %s (%s)"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
len = RSA_size(myself->rsa_key);
|
|
|
|
|
|
|
|
/* Check if the length of the meta key is all right */
|
|
|
|
|
|
|
|
if(strlen(buffer) != len*2)
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Intruder: wrong meta key length from %s (%s)"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Allocate buffers for the meta key */
|
|
|
|
|
|
|
|
if(!cl->cipher_inkey)
|
|
|
|
cl->cipher_inkey = xmalloc(len);
|
|
|
|
|
|
|
|
if(!cl->cipher_inctx)
|
|
|
|
cl->cipher_inctx = xmalloc(sizeof(*cl->cipher_inctx));
|
|
|
|
|
|
|
|
/* Convert the challenge from hexadecimal back to binary */
|
|
|
|
|
|
|
|
hex2bin(buffer,buffer,len);
|
|
|
|
|
|
|
|
/* Decrypt the meta key */
|
|
|
|
|
|
|
|
if(RSA_private_decrypt(len, buffer, cl->cipher_inkey, myself->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if(debug_lvl >= DEBUG_SCARY_THINGS)
|
|
|
|
{
|
|
|
|
bin2hex(cl->cipher_inkey, buffer, len);
|
|
|
|
buffer[len*2] = '\0';
|
|
|
|
syslog(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), buffer);
|
|
|
|
}
|
|
|
|
|
2001-02-25 19:09:45 +00:00
|
|
|
/* All incoming requests will now be encrypted. */
|
|
|
|
|
2001-02-26 11:37:20 +00:00
|
|
|
EVP_DecryptInit(cl->cipher_inctx, EVP_bf_cfb(),
|
|
|
|
cl->cipher_inkey + len - EVP_bf_cfb()->key_len,
|
|
|
|
cl->cipher_inkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len);
|
2000-10-29 22:55:15 +00:00
|
|
|
|
2001-02-25 19:09:45 +00:00
|
|
|
cl->status.decryptin = 1;
|
2000-10-29 22:55:15 +00:00
|
|
|
|
2001-02-25 19:09:45 +00:00
|
|
|
cl->allow_request = CHALLENGE;
|
2000-09-10 15:18:03 +00:00
|
|
|
cp
|
2001-02-25 19:09:45 +00:00
|
|
|
return send_challenge(cl);
|
2000-09-10 15:18:03 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Address and subnet information exchange */
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_add_subnet(connection_t *cl, subnet_t *subnet)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-09-22 15:06:28 +00:00
|
|
|
int x;
|
|
|
|
char *netstr;
|
2001-01-07 20:19:35 +00:00
|
|
|
char *owner;
|
2000-09-22 15:06:28 +00:00
|
|
|
cp
|
2001-03-13 21:33:31 +00:00
|
|
|
if((cl->options | myself->options | subnet->owner->options) & OPTION_INDIRECT)
|
2001-01-07 20:19:35 +00:00
|
|
|
owner = myself->name;
|
|
|
|
else
|
|
|
|
owner = subnet->owner->name;
|
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
x = send_request(cl, "%d %s %s", ADD_SUBNET,
|
2001-01-07 20:19:35 +00:00
|
|
|
owner, netstr = net2str(subnet));
|
2000-09-22 15:06:28 +00:00
|
|
|
free(netstr);
|
2000-09-10 16:15:35 +00:00
|
|
|
cp
|
2000-09-22 15:06:28 +00:00
|
|
|
return x;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int add_subnet_h(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-11-22 19:55:53 +00:00
|
|
|
char subnetstr[MAX_STRING_SIZE];
|
|
|
|
char name[MAX_STRING_SIZE];
|
2000-11-20 19:12:17 +00:00
|
|
|
connection_t *owner, *p;
|
2000-10-29 00:02:20 +00:00
|
|
|
subnet_t *subnet;
|
2001-01-05 23:53:53 +00:00
|
|
|
avl_node_t *node;
|
2000-09-17 21:42:05 +00:00
|
|
|
cp
|
2000-11-22 19:55:53 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2)
|
2000-09-17 21:42:05 +00:00
|
|
|
{
|
2000-09-22 15:06:28 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s)"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if owner name is a valid */
|
|
|
|
|
2000-10-15 00:59:37 +00:00
|
|
|
if(check_id(name))
|
2000-09-17 21:42:05 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if subnet string is valid */
|
|
|
|
|
2000-10-11 22:01:02 +00:00
|
|
|
if(!(subnet = str2net(subnetstr)))
|
2000-09-17 21:42:05 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
2000-09-22 15:06:28 +00:00
|
|
|
|
2000-09-17 21:42:05 +00:00
|
|
|
/* Check if somebody tries to add a subnet of ourself */
|
|
|
|
|
|
|
|
if(!strcmp(name, myself->name))
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Warning: got ADD_SUBNET from %s (%s) for ourself, restarting"),
|
|
|
|
cl->name, cl->hostname);
|
|
|
|
sighup = 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if the owner of the new subnet is in the connection list */
|
|
|
|
|
2000-10-11 22:01:02 +00:00
|
|
|
if(!(owner = lookup_id(name)))
|
2000-09-17 21:42:05 +00:00
|
|
|
{
|
2000-09-22 15:06:28 +00:00
|
|
|
syslog(LOG_ERR, _("Got ADD_SUBNET for %s from %s (%s) which is not in our connection list"),
|
2000-09-17 21:42:05 +00:00
|
|
|
name, cl->name, cl->hostname);
|
2000-09-22 15:06:28 +00:00
|
|
|
return -1;
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
/* If everything is correct, add the subnet to the list of the owner */
|
2000-10-11 22:01:02 +00:00
|
|
|
|
|
|
|
subnet_add(owner, subnet);
|
2000-10-29 00:02:20 +00:00
|
|
|
|
|
|
|
/* Tell the rest */
|
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
for(node = connection_tree->head; node; node = node->next)
|
2000-11-20 19:12:17 +00:00
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
p = (connection_t *)node->data;
|
2000-11-20 19:12:17 +00:00
|
|
|
if(p->status.meta && p->status.active && p!= cl)
|
|
|
|
send_add_subnet(p, subnet);
|
|
|
|
}
|
2000-09-22 15:06:28 +00:00
|
|
|
cp
|
2000-10-11 22:01:02 +00:00
|
|
|
return 0;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_del_subnet(connection_t *cl, subnet_t *subnet)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-10-28 21:05:20 +00:00
|
|
|
int x;
|
|
|
|
char *netstr;
|
2001-01-07 20:19:35 +00:00
|
|
|
char *owner;
|
2000-09-10 16:15:35 +00:00
|
|
|
cp
|
2001-01-07 20:19:35 +00:00
|
|
|
if(cl->options & OPTION_INDIRECT)
|
|
|
|
owner = myself->name;
|
|
|
|
else
|
|
|
|
owner = subnet->owner->name;
|
|
|
|
|
|
|
|
x = send_request(cl, "%d %s %s", DEL_SUBNET, owner, netstr = net2str(subnet));
|
2000-10-28 21:05:20 +00:00
|
|
|
free(netstr);
|
|
|
|
cp
|
|
|
|
return x;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int del_subnet_h(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-11-22 19:55:53 +00:00
|
|
|
char subnetstr[MAX_STRING_SIZE];
|
|
|
|
char name[MAX_STRING_SIZE];
|
2000-11-20 19:12:17 +00:00
|
|
|
connection_t *owner, *p;
|
2000-10-29 00:02:20 +00:00
|
|
|
subnet_t *subnet;
|
2001-01-05 23:53:53 +00:00
|
|
|
avl_node_t *node;
|
2000-09-17 21:42:05 +00:00
|
|
|
cp
|
2000-11-22 19:55:53 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 3)
|
2000-09-17 21:42:05 +00:00
|
|
|
{
|
2000-09-22 15:06:28 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s)"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if owner name is a valid */
|
|
|
|
|
2000-10-15 00:59:37 +00:00
|
|
|
if(check_id(name))
|
2000-09-17 21:42:05 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if subnet string is valid */
|
|
|
|
|
2000-10-11 22:01:02 +00:00
|
|
|
if(!(subnet = str2net(subnetstr)))
|
2000-09-17 21:42:05 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
free(subnetstr);
|
|
|
|
|
|
|
|
/* Check if somebody tries to add a subnet of ourself */
|
2000-09-17 21:42:05 +00:00
|
|
|
|
|
|
|
if(!strcmp(name, myself->name))
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Warning: got DEL_SUBNET from %s (%s) for ourself, restarting"),
|
|
|
|
cl->name, cl->hostname);
|
|
|
|
sighup = 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if the owner of the new subnet is in the connection list */
|
|
|
|
|
2000-10-11 22:01:02 +00:00
|
|
|
if(!(owner = lookup_id(name)))
|
2000-09-17 21:42:05 +00:00
|
|
|
{
|
2000-09-22 15:06:28 +00:00
|
|
|
syslog(LOG_ERR, _("Got DEL_SUBNET for %s from %s (%s) which is not in our connection list"),
|
2000-09-17 21:42:05 +00:00
|
|
|
name, cl->name, cl->hostname);
|
2000-09-22 15:06:28 +00:00
|
|
|
return -1;
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
2000-09-22 15:06:28 +00:00
|
|
|
|
2000-10-11 22:01:02 +00:00
|
|
|
/* If everything is correct, delete the subnet from the list of the owner */
|
|
|
|
|
|
|
|
subnet_del(subnet);
|
2000-10-29 00:02:20 +00:00
|
|
|
|
|
|
|
/* Tell the rest */
|
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
for(node = connection_tree->head; node; node = node->next)
|
2000-11-20 19:12:17 +00:00
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
p = (connection_t *)node->data;
|
2000-11-20 19:12:17 +00:00
|
|
|
if(p->status.meta && p->status.active && p!= cl)
|
|
|
|
send_del_subnet(p, subnet);
|
|
|
|
}
|
2000-09-22 15:06:28 +00:00
|
|
|
cp
|
2000-10-11 22:01:02 +00:00
|
|
|
return 0;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-09-10 15:18:03 +00:00
|
|
|
/* New and closed connections notification */
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_add_host(connection_t *cl, connection_t *other)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
|
|
|
cp
|
2001-03-13 21:33:31 +00:00
|
|
|
if(!((cl->options | myself->options | other->options) & OPTION_INDIRECT))
|
2001-01-07 20:19:35 +00:00
|
|
|
return send_request(cl, "%d %s %lx:%d %lx", ADD_HOST,
|
2000-10-29 00:02:20 +00:00
|
|
|
other->name, other->address, other->port, other->options);
|
2001-02-27 16:37:31 +00:00
|
|
|
else
|
|
|
|
return 0;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int add_host_h(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-11-20 19:12:17 +00:00
|
|
|
connection_t *old, *new, *p;
|
2000-11-22 19:55:53 +00:00
|
|
|
char name[MAX_STRING_SIZE];
|
2001-01-05 23:53:53 +00:00
|
|
|
avl_node_t *node;
|
2000-09-10 22:49:46 +00:00
|
|
|
cp
|
2000-11-20 19:12:17 +00:00
|
|
|
new = new_connection();
|
2000-09-10 22:49:46 +00:00
|
|
|
|
2001-02-27 16:37:31 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING" %lx:%hd %lx", name, &new->address, &new->port, &new->options) != 4)
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s)"), cl->name, cl->hostname);
|
2000-09-10 22:49:46 +00:00
|
|
|
return -1;
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
2000-09-10 22:49:46 +00:00
|
|
|
|
|
|
|
/* Check if identity is a valid name */
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-11-22 19:55:53 +00:00
|
|
|
if(check_id(name))
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
|
2000-11-20 19:12:17 +00:00
|
|
|
free_connection(new);
|
2000-09-10 22:49:46 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
/* Check if somebody tries to add ourself */
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-11-22 22:05:37 +00:00
|
|
|
if(!strcmp(name, myself->name))
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"), cl->name, cl->hostname);
|
2000-09-10 22:49:46 +00:00
|
|
|
sighup = 1;
|
2000-11-20 19:12:17 +00:00
|
|
|
free_connection(new);
|
2000-09-10 22:49:46 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2000-09-22 15:06:28 +00:00
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
/* Fill in more of the new connection structure */
|
2000-09-10 22:49:46 +00:00
|
|
|
|
2000-10-11 22:01:02 +00:00
|
|
|
new->hostname = hostlookup(htonl(new->address));
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
/* Check if the new host already exists in the connnection list */
|
|
|
|
|
2000-11-22 19:55:53 +00:00
|
|
|
if((old = lookup_id(name)))
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
2000-10-11 22:01:02 +00:00
|
|
|
if((new->address == old->address) && (new->port == old->port))
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
2000-10-21 11:52:08 +00:00
|
|
|
if(debug_lvl >= DEBUG_CONNECTIONS)
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"),
|
2001-07-19 12:29:40 +00:00
|
|
|
old->name, old->hostname, cl->name, cl->hostname);
|
2000-11-20 19:12:17 +00:00
|
|
|
free_connection(new);
|
2000-09-17 21:42:05 +00:00
|
|
|
return 0;
|
2000-09-10 22:49:46 +00:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2000-10-21 11:52:08 +00:00
|
|
|
if(debug_lvl >= DEBUG_CONNECTIONS)
|
2000-10-29 00:02:20 +00:00
|
|
|
syslog(LOG_NOTICE, _("Removing old entry for %s (%s) in favour of new connection"),
|
2000-09-17 21:42:05 +00:00
|
|
|
old->name, old->hostname);
|
2000-10-29 00:02:20 +00:00
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
terminate_connection(old);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2001-07-19 12:29:40 +00:00
|
|
|
/* Hook it up into the active tree */
|
2000-10-29 00:02:20 +00:00
|
|
|
|
2000-11-22 19:55:53 +00:00
|
|
|
new->name = xstrdup(name);
|
2001-07-19 12:29:40 +00:00
|
|
|
active_add(new);
|
2000-11-22 18:54:08 +00:00
|
|
|
id_add(new);
|
2000-10-29 00:02:20 +00:00
|
|
|
|
|
|
|
/* Tell the rest about the new host */
|
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
for(node = connection_tree->head; node; node = node->next)
|
2000-11-20 19:12:17 +00:00
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
p = (connection_t *)node->data;
|
2000-11-20 19:12:17 +00:00
|
|
|
if(p->status.meta && p->status.active && p!=cl)
|
|
|
|
send_add_host(p, new);
|
|
|
|
}
|
2000-10-29 00:02:20 +00:00
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
/* Fill in rest of connection structure */
|
2000-09-10 22:49:46 +00:00
|
|
|
|
2000-10-28 21:05:20 +00:00
|
|
|
new->nexthop = cl;
|
2000-09-10 22:49:46 +00:00
|
|
|
new->status.active = 1;
|
2001-02-25 16:34:19 +00:00
|
|
|
new->cipher_pkttype = EVP_bf_cbc();
|
2000-11-04 16:39:19 +00:00
|
|
|
new->cipher_pktkeylength = cl->cipher_pkttype->key_len + cl->cipher_pkttype->iv_len;
|
2000-09-10 22:49:46 +00:00
|
|
|
cp
|
|
|
|
return 0;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_del_host(connection_t *cl, connection_t *other)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-09-22 15:06:28 +00:00
|
|
|
cp
|
2001-03-13 21:33:31 +00:00
|
|
|
if(!((cl->options | myself->options) & OPTION_INDIRECT))
|
2001-01-07 20:19:35 +00:00
|
|
|
return send_request(cl, "%d %s %lx:%d %lx", DEL_HOST,
|
2000-10-29 00:02:20 +00:00
|
|
|
other->name, other->address, other->port, other->options);
|
2001-02-27 16:37:31 +00:00
|
|
|
else
|
|
|
|
return 0;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int del_host_h(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-11-22 19:55:53 +00:00
|
|
|
char name[MAX_STRING_SIZE];
|
2001-05-07 19:08:46 +00:00
|
|
|
ipv4_t address;
|
2000-09-10 22:49:46 +00:00
|
|
|
port_t port;
|
2000-10-29 00:02:20 +00:00
|
|
|
long int options;
|
2000-11-20 19:12:17 +00:00
|
|
|
connection_t *old, *p;
|
2001-01-05 23:53:53 +00:00
|
|
|
avl_node_t *node;
|
2000-09-10 22:49:46 +00:00
|
|
|
cp
|
2001-02-27 16:37:31 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING" %lx:%hd %lx", name, &address, &port, &options) != 4)
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname);
|
2000-09-14 21:51:21 +00:00
|
|
|
return -1;
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
2000-09-10 22:49:46 +00:00
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
/* Check if identity is a valid name */
|
|
|
|
|
2000-10-29 00:02:20 +00:00
|
|
|
if(check_id(name))
|
2000-09-22 15:06:28 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
/* Check if somebody tries to delete ourself */
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
if(!strcmp(name, myself->name))
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname);
|
2000-09-22 15:06:28 +00:00
|
|
|
sighup = 1;
|
|
|
|
return 0;
|
|
|
|
}
|
2000-09-10 22:49:46 +00:00
|
|
|
|
2000-09-22 15:06:28 +00:00
|
|
|
/* Check if the new host already exists in the connnection list */
|
|
|
|
|
|
|
|
if(!(old = lookup_id(name)))
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
2000-09-22 15:06:28 +00:00
|
|
|
syslog(LOG_ERR, _("Got DEL_HOST from %s (%s) for %s which is not in our connection list"),
|
2001-07-19 12:29:40 +00:00
|
|
|
cl->name, cl->hostname, name);
|
2000-09-22 15:06:28 +00:00
|
|
|
return -1;
|
2000-09-10 22:49:46 +00:00
|
|
|
}
|
2000-09-22 15:06:28 +00:00
|
|
|
|
|
|
|
/* Check if the rest matches */
|
|
|
|
|
2000-10-29 00:02:20 +00:00
|
|
|
if(address!=old->address || port!=old->port || options!=old->options || cl!=old->nexthop)
|
2000-09-22 15:06:28 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_WARNING, _("Got DEL_HOST from %s (%s) for %s which doesn't match"), cl->name, cl->hostname, old->name);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Ok, since EVERYTHING seems to check out all right, delete it */
|
|
|
|
|
|
|
|
old->status.active = 0;
|
|
|
|
terminate_connection(old);
|
2000-10-29 00:02:20 +00:00
|
|
|
|
|
|
|
/* Tell the rest about the new host */
|
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
for(node = connection_tree->head; node; node = node->next)
|
2000-11-20 19:12:17 +00:00
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
p = (connection_t *)node->data;
|
2000-11-20 19:12:17 +00:00
|
|
|
if(p->status.meta && p->status.active && p!=cl)
|
|
|
|
send_del_host(p, old);
|
|
|
|
}
|
2000-09-10 22:49:46 +00:00
|
|
|
cp
|
|
|
|
return 0;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-09-10 15:18:03 +00:00
|
|
|
/* Status and error notification routines */
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_status(connection_t *cl, int statusno, char *statusstring)
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
2000-09-10 16:15:35 +00:00
|
|
|
cp
|
|
|
|
if(!statusstring)
|
|
|
|
statusstring = status_text[statusno];
|
2000-09-10 15:18:03 +00:00
|
|
|
cp
|
|
|
|
return send_request(cl, "%d %d %s", STATUS, statusno, statusstring);
|
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int status_h(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
|
|
|
int statusno;
|
2000-11-22 19:55:53 +00:00
|
|
|
char statusstring[MAX_STRING_SIZE];
|
2000-09-10 16:15:35 +00:00
|
|
|
cp
|
2000-11-22 19:55:53 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d %d "MAX_STRING, &statusno, statusstring) != 2)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-09-15 12:58:40 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad STATUS from %s (%s)"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname);
|
2000-09-10 16:15:35 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2000-10-21 11:52:08 +00:00
|
|
|
if(debug_lvl >= DEBUG_STATUS)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname, status_text[statusno], statusstring);
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
cp
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2001-02-06 10:12:51 +00:00
|
|
|
int send_error(connection_t *cl, int err, char *errstring)
|
2000-09-10 15:18:03 +00:00
|
|
|
{
|
|
|
|
cp
|
2000-09-14 21:51:21 +00:00
|
|
|
if(!errstring)
|
2001-02-06 10:12:51 +00:00
|
|
|
errstring = strerror(err);
|
|
|
|
return send_request(cl, "%d %d %s", ERROR, err, errstring);
|
2000-09-10 15:18:03 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int error_h(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2001-02-06 10:42:27 +00:00
|
|
|
int err;
|
2000-11-22 19:55:53 +00:00
|
|
|
char errorstring[MAX_STRING_SIZE];
|
2000-09-10 16:15:35 +00:00
|
|
|
cp
|
2001-02-06 10:42:27 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d %d "MAX_STRING, &err, errorstring) != 2)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-10-15 00:59:37 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad ERROR from %s (%s)"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname);
|
2000-09-10 16:15:35 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2000-10-21 11:52:08 +00:00
|
|
|
if(debug_lvl >= DEBUG_ERROR)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"),
|
2001-02-06 10:42:27 +00:00
|
|
|
cl->name, cl->hostname, strerror(err), errorstring);
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
terminate_connection(cl);
|
|
|
|
cp
|
2000-09-10 16:15:35 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_termreq(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-09-10 22:49:46 +00:00
|
|
|
cp
|
|
|
|
return send_request(cl, "%d", TERMREQ);
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int termreq_h(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-09-10 22:49:46 +00:00
|
|
|
cp
|
|
|
|
terminate_connection(cl);
|
|
|
|
cp
|
|
|
|
return 0;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_ping(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2001-05-24 21:29:09 +00:00
|
|
|
char salt[SALTLEN*2+1];
|
2000-11-04 20:44:28 +00:00
|
|
|
cp
|
2000-09-10 22:49:46 +00:00
|
|
|
cl->status.pinged = 1;
|
2000-11-04 20:44:28 +00:00
|
|
|
cl->last_ping_time = time(NULL);
|
2001-07-04 08:41:36 +00:00
|
|
|
RAND_pseudo_bytes(salt, SALTLEN);
|
2001-05-24 21:29:09 +00:00
|
|
|
bin2hex(salt, salt, SALTLEN);
|
2001-05-25 08:36:11 +00:00
|
|
|
salt[SALTLEN*2] = '\0';
|
2000-09-10 16:15:35 +00:00
|
|
|
cp
|
2001-05-24 21:29:09 +00:00
|
|
|
return send_request(cl, "%d %s", PING, salt);
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int ping_h(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2000-09-10 22:49:46 +00:00
|
|
|
cp
|
|
|
|
return send_pong(cl);
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_pong(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
2001-05-24 21:29:09 +00:00
|
|
|
char salt[SALTLEN*2+1];
|
2000-09-10 16:15:35 +00:00
|
|
|
cp
|
2001-07-04 08:41:36 +00:00
|
|
|
RAND_pseudo_bytes(salt, SALTLEN);
|
2001-05-24 21:29:09 +00:00
|
|
|
bin2hex(salt, salt, SALTLEN);
|
2001-05-25 08:36:11 +00:00
|
|
|
salt[SALTLEN*2] = '\0';
|
2001-05-24 21:29:09 +00:00
|
|
|
cp
|
|
|
|
return send_request(cl, "%d %s", PONG, salt);
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int pong_h(connection_t *cl)
|
2000-09-10 16:15:35 +00:00
|
|
|
{
|
|
|
|
cp
|
2000-11-04 20:44:28 +00:00
|
|
|
cl->status.pinged = 0;
|
2000-09-10 22:49:46 +00:00
|
|
|
cp
|
|
|
|
return 0;
|
2000-09-10 16:15:35 +00:00
|
|
|
}
|
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
/* Key exchange */
|
2000-09-10 16:15:35 +00:00
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_key_changed(connection_t *from, connection_t *cl)
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-11-20 19:12:17 +00:00
|
|
|
connection_t *p;
|
2001-01-05 23:53:53 +00:00
|
|
|
avl_node_t *node;
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2001-05-24 21:52:26 +00:00
|
|
|
/* Only send this message if some other daemon requested our key previously.
|
|
|
|
This reduces unnecessary key_changed broadcasts.
|
|
|
|
*/
|
|
|
|
|
2001-06-09 10:00:34 +00:00
|
|
|
if(from==myself && !mykeyused)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
for(node = connection_tree->head; node; node = node->next)
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2001-06-09 10:00:34 +00:00
|
|
|
p = (connection_t *)node->data;
|
|
|
|
if(p != cl && p->status.meta && p->status.active)
|
|
|
|
if(!(p->options & OPTION_INDIRECT) || from == myself)
|
|
|
|
send_request(p, "%d %s", KEY_CHANGED, from->name);
|
|
|
|
}
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2000-03-26 00:33:07 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int key_changed_h(connection_t *cl)
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-11-22 19:55:53 +00:00
|
|
|
char from_id[MAX_STRING_SIZE];
|
2000-11-20 19:12:17 +00:00
|
|
|
connection_t *from;
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2000-11-22 19:55:53 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING, from_id) != 1)
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
2000-09-14 21:51:21 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname);
|
2000-09-14 21:51:21 +00:00
|
|
|
return -1;
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
2000-05-01 18:07:12 +00:00
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
if(!(from = lookup_id(from_id)))
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-09-15 12:58:40 +00:00
|
|
|
syslog(LOG_ERR, _("Got KEY_CHANGED from %s (%s) origin %s which does not exist in our connection list"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname, from_id);
|
2000-03-26 00:33:07 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2000-09-10 23:11:37 +00:00
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
from->status.validkey = 0;
|
|
|
|
from->status.waitingforkey = 0;
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2001-03-13 21:33:31 +00:00
|
|
|
if(!(from->options | cl->options | myself->options) & OPTION_INDIRECT)
|
|
|
|
send_key_changed(from, cl);
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2000-03-26 00:33:07 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_req_key(connection_t *from, connection_t *to)
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2000-09-15 12:58:40 +00:00
|
|
|
return send_request(to->nexthop, "%d %s %s", REQ_KEY,
|
2000-09-17 21:42:05 +00:00
|
|
|
from->name, to->name);
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int req_key_h(connection_t *cl)
|
2000-08-07 14:52:16 +00:00
|
|
|
{
|
2000-11-22 19:55:53 +00:00
|
|
|
char from_id[MAX_STRING_SIZE];
|
|
|
|
char to_id[MAX_STRING_SIZE];
|
2000-11-20 19:12:17 +00:00
|
|
|
connection_t *from, *to;
|
2000-10-29 10:39:08 +00:00
|
|
|
char pktkey[129];
|
2000-08-07 14:52:16 +00:00
|
|
|
cp
|
2000-11-22 19:55:53 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, from_id, to_id) != 2)
|
2000-08-07 14:52:16 +00:00
|
|
|
{
|
2000-09-15 12:58:40 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname);
|
2000-09-10 22:49:46 +00:00
|
|
|
return -1;
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
2000-09-10 22:49:46 +00:00
|
|
|
|
|
|
|
if(!(from = lookup_id(from_id)))
|
2000-08-07 14:52:16 +00:00
|
|
|
{
|
2000-09-15 12:58:40 +00:00
|
|
|
syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) origin %s which does not exist in our connection list"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname, from_id);
|
2000-08-07 14:52:16 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2000-03-26 00:33:07 +00:00
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
/* Check if this key request is for us */
|
2000-05-01 18:07:12 +00:00
|
|
|
|
2001-05-24 21:52:26 +00:00
|
|
|
if(!strcmp(to_id, myself->name)) /* Yes, send our own key back */
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-10-29 22:10:44 +00:00
|
|
|
bin2hex(myself->cipher_pktkey, pktkey, myself->cipher_pktkeylength);
|
|
|
|
pktkey[myself->cipher_pktkeylength*2] = '\0';
|
2000-10-29 10:39:08 +00:00
|
|
|
send_ans_key(myself, from, pktkey);
|
2001-05-24 21:52:26 +00:00
|
|
|
mykeyused = 1;
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|
2000-09-10 22:49:46 +00:00
|
|
|
else
|
|
|
|
{
|
|
|
|
if(!(to = lookup_id(to_id)))
|
|
|
|
{
|
2000-09-15 12:58:40 +00:00
|
|
|
syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) destination %s which does not exist in our connection list"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname, to_id);
|
2000-09-10 22:49:46 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2000-10-29 22:10:44 +00:00
|
|
|
|
|
|
|
if(to->status.validkey) /* Proxy keys */
|
|
|
|
{
|
|
|
|
bin2hex(to->cipher_pktkey, pktkey, to->cipher_pktkeylength);
|
|
|
|
pktkey[to->cipher_pktkeylength*2] = '\0';
|
|
|
|
send_ans_key(to, from, pktkey);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
send_req_key(from, to);
|
2000-09-10 22:49:46 +00:00
|
|
|
}
|
|
|
|
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2000-03-26 00:33:07 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int send_ans_key(connection_t *from, connection_t *to, char *pktkey)
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2000-09-15 12:58:40 +00:00
|
|
|
return send_request(to->nexthop, "%d %s %s %s", ANS_KEY,
|
2000-10-14 17:04:16 +00:00
|
|
|
from->name, to->name, pktkey);
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int ans_key_h(connection_t *cl)
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-11-22 19:55:53 +00:00
|
|
|
char from_id[MAX_STRING_SIZE];
|
|
|
|
char to_id[MAX_STRING_SIZE];
|
|
|
|
char pktkey[MAX_STRING_SIZE];
|
2000-09-10 23:11:37 +00:00
|
|
|
int keylength;
|
2000-11-20 19:12:17 +00:00
|
|
|
connection_t *from, *to;
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2000-11-22 19:55:53 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING, from_id, to_id, pktkey) != 3)
|
2000-06-23 19:27:03 +00:00
|
|
|
{
|
2000-09-15 12:58:40 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname);
|
2000-09-10 22:49:46 +00:00
|
|
|
return -1;
|
2000-09-17 21:42:05 +00:00
|
|
|
}
|
2000-05-01 18:07:12 +00:00
|
|
|
|
2000-09-10 22:49:46 +00:00
|
|
|
if(!(from = lookup_id(from_id)))
|
2000-03-26 00:33:07 +00:00
|
|
|
{
|
2000-09-15 12:58:40 +00:00
|
|
|
syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) origin %s which does not exist in our connection list"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname, from_id);
|
2000-03-26 00:33:07 +00:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2000-11-04 16:54:21 +00:00
|
|
|
/* Check correctness of packet key */
|
2000-05-01 18:07:12 +00:00
|
|
|
|
2000-10-29 10:39:08 +00:00
|
|
|
keylength = strlen(pktkey);
|
2000-09-17 21:42:05 +00:00
|
|
|
|
2000-10-29 22:10:44 +00:00
|
|
|
if(keylength != from->cipher_pktkeylength*2)
|
2000-10-29 10:39:08 +00:00
|
|
|
{
|
2000-10-29 22:10:44 +00:00
|
|
|
syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key length"),
|
2000-10-29 10:39:08 +00:00
|
|
|
cl->name, cl->hostname, from->name);
|
|
|
|
return -1;
|
|
|
|
}
|
2000-10-29 09:19:27 +00:00
|
|
|
|
2000-11-04 16:54:21 +00:00
|
|
|
/* Forward it if necessary */
|
2000-10-29 09:19:27 +00:00
|
|
|
|
2000-10-29 10:39:08 +00:00
|
|
|
if(strcmp(to_id, myself->name))
|
2000-09-10 22:49:46 +00:00
|
|
|
{
|
|
|
|
if(!(to = lookup_id(to_id)))
|
|
|
|
{
|
2000-09-15 12:58:40 +00:00
|
|
|
syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) destination %s which does not exist in our connection list"),
|
2000-09-17 21:42:05 +00:00
|
|
|
cl->name, cl->hostname, to_id);
|
2000-09-10 22:49:46 +00:00
|
|
|
return -1;
|
|
|
|
}
|
2000-10-14 17:04:16 +00:00
|
|
|
send_ans_key(from, to, pktkey);
|
2000-03-26 00:33:07 +00:00
|
|
|
}
|
2000-09-10 22:49:46 +00:00
|
|
|
|
2000-11-04 16:54:21 +00:00
|
|
|
/* Update our copy of the origin's packet key */
|
|
|
|
|
|
|
|
if(from->cipher_pktkey)
|
|
|
|
free(from->cipher_pktkey);
|
|
|
|
|
2000-11-22 19:55:53 +00:00
|
|
|
from->cipher_pktkey = xstrdup(pktkey);
|
2000-11-04 16:54:21 +00:00
|
|
|
keylength /= 2;
|
2000-11-22 20:25:27 +00:00
|
|
|
hex2bin(from->cipher_pktkey, from->cipher_pktkey, keylength);
|
|
|
|
from->cipher_pktkey[keylength] = '\0';
|
2000-11-04 16:54:21 +00:00
|
|
|
|
|
|
|
from->status.validkey = 1;
|
|
|
|
from->status.waitingforkey = 0;
|
2001-01-07 15:25:49 +00:00
|
|
|
|
|
|
|
flush_queue(from);
|
2000-04-25 18:57:23 +00:00
|
|
|
cp
|
2000-03-26 00:33:07 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2001-01-07 20:19:35 +00:00
|
|
|
int send_tcppacket(connection_t *cl, vpn_packet_t *packet)
|
|
|
|
{
|
|
|
|
int x;
|
2001-03-04 13:59:32 +00:00
|
|
|
cp
|
2001-05-25 11:54:28 +00:00
|
|
|
/* Evil hack. */
|
|
|
|
|
2001-01-07 20:19:35 +00:00
|
|
|
x = send_request(cl->nexthop, "%d %hd", PACKET, packet->len);
|
|
|
|
|
|
|
|
if(x)
|
|
|
|
return x;
|
2001-05-25 11:54:28 +00:00
|
|
|
cp
|
|
|
|
return send_meta(cl, packet->data, packet->len);
|
2001-01-07 20:19:35 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int tcppacket_h(connection_t *cl)
|
|
|
|
{
|
2001-05-25 11:54:28 +00:00
|
|
|
short int len;
|
2001-03-04 13:59:32 +00:00
|
|
|
cp
|
2001-05-25 11:54:28 +00:00
|
|
|
if(sscanf(cl->buffer, "%*d %hd", &len) != 1)
|
2001-01-07 20:19:35 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Got bad PACKET from %s (%s)"), cl->name, cl->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2001-05-25 11:54:28 +00:00
|
|
|
/* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */
|
2001-01-07 20:19:35 +00:00
|
|
|
|
2001-05-25 11:54:28 +00:00
|
|
|
cl->tcplen = len;
|
2001-03-04 13:59:32 +00:00
|
|
|
cp
|
|
|
|
return 0;
|
2001-01-07 20:19:35 +00:00
|
|
|
}
|
|
|
|
|
2000-09-22 16:20:07 +00:00
|
|
|
/* Jumptable for the request handlers */
|
2000-09-10 15:18:03 +00:00
|
|
|
|
2000-11-20 19:12:17 +00:00
|
|
|
int (*request_handlers[])(connection_t*) = {
|
2001-02-25 19:09:45 +00:00
|
|
|
id_h, metakey_h, challenge_h, chal_reply_h,
|
2000-09-10 16:15:35 +00:00
|
|
|
status_h, error_h, termreq_h,
|
|
|
|
ping_h, pong_h,
|
2000-09-10 22:49:46 +00:00
|
|
|
add_host_h, del_host_h,
|
|
|
|
add_subnet_h, del_subnet_h,
|
|
|
|
key_changed_h, req_key_h, ans_key_h,
|
2001-01-07 20:19:35 +00:00
|
|
|
tcppacket_h,
|
2000-09-10 15:18:03 +00:00
|
|
|
};
|
|
|
|
|
2000-09-22 16:20:07 +00:00
|
|
|
/* Request names */
|
|
|
|
|
2000-09-10 16:15:35 +00:00
|
|
|
char (*request_name[]) = {
|
2001-02-25 19:09:45 +00:00
|
|
|
"ID", "METAKEY", "CHALLENGE", "CHAL_REPLY",
|
2000-09-10 16:15:35 +00:00
|
|
|
"STATUS", "ERROR", "TERMREQ",
|
|
|
|
"PING", "PONG",
|
2000-09-10 22:49:46 +00:00
|
|
|
"ADD_HOST", "DEL_HOST",
|
|
|
|
"ADD_SUBNET", "DEL_SUBNET",
|
|
|
|
"KEY_CHANGED", "REQ_KEY", "ANS_KEY",
|
2001-01-07 20:19:35 +00:00
|
|
|
"PACKET",
|
2000-03-26 00:33:07 +00:00
|
|
|
};
|
2000-10-14 17:04:16 +00:00
|
|
|
|
|
|
|
/* Status strings */
|
|
|
|
|
|
|
|
char (*status_text[]) = {
|
2000-10-16 16:33:30 +00:00
|
|
|
"Warning",
|
2000-10-14 17:04:16 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
/* Error strings */
|
|
|
|
|
|
|
|
char (*error_text[]) = {
|
2000-10-16 16:33:30 +00:00
|
|
|
"Error",
|
2000-10-14 17:04:16 +00:00
|
|
|
};
|