2002-02-18 16:25:19 +00:00
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/*
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net_setup.c -- Setup.
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2002-06-21 10:11:37 +00:00
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Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl>,
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2000-2002 Guus Sliepen <guus@sliepen.eu.org>
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2002-02-18 16:25:19 +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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2003-01-14 12:53:59 +00:00
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$Id: net_setup.c,v 1.1.2.28 2003/01/14 12:53:59 guus Exp $
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2002-02-18 16:25:19 +00:00
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*/
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#include "config.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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/* SunOS really wants sys/socket.h BEFORE net/if.h,
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and FreeBSD wants these lines below the rest. */
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <net/if.h>
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2002-09-15 14:55:54 +00:00
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#ifdef HAVE_NETINET_IN_SYSTM_H
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#include <netinet/in_systm.h>
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#endif
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#ifdef HAVE_NETINET_IP_H
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#include <netinet/ip.h>
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#endif
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#ifdef HAVE_NETINET_TCP_H
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#include <netinet/tcp.h>
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#endif
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2002-02-18 16:25:19 +00:00
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#include <openssl/pem.h>
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#include <openssl/rsa.h>
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#include <openssl/rand.h>
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#include <utils.h>
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#include <xalloc.h>
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#include <avl_tree.h>
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#include <list.h>
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#include "conf.h"
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#include "connection.h"
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#include "meta.h"
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#include "net.h"
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#include "netutl.h"
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#include "process.h"
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#include "protocol.h"
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#include "subnet.h"
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2002-09-04 13:48:52 +00:00
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#include "graph.h"
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2002-02-18 16:25:19 +00:00
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#include "process.h"
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#include "route.h"
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#include "device.h"
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#include "event.h"
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#include "system.h"
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char *myport;
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2002-09-09 22:33:31 +00:00
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int read_rsa_public_key(connection_t *c)
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2002-02-18 16:25:19 +00:00
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{
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2002-09-09 21:25:28 +00:00
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FILE *fp;
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char *fname;
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char *key;
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cp();
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if(!c->rsa_key)
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c->rsa_key = RSA_new();
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/* First, check for simple PublicKey statement */
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if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
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BN_hex2bn(&c->rsa_key->n, key);
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BN_hex2bn(&c->rsa_key->e, "FFFF");
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free(key);
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return 0;
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}
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/* Else, check for PublicKeyFile statement and read it */
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if(get_config_string
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(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
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if(is_safe_path(fname)) {
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fp = fopen(fname, "r");
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if(!fp) {
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syslog(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
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fname, strerror(errno));
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free(fname);
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return -1;
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}
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free(fname);
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c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
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fclose(fp);
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if(c->rsa_key)
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return 0; /* Woohoo. */
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/* If it fails, try PEM_read_RSA_PUBKEY. */
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fp = fopen(fname, "r");
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if(!fp) {
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syslog(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
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fname, strerror(errno));
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free(fname);
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return -1;
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}
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free(fname);
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c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
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fclose(fp);
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if(c->rsa_key)
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return 0;
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syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
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fname, strerror(errno));
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return -1;
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} else {
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free(fname);
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return -1;
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}
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}
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/* Else, check if a harnessed public key is in the config file */
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asprintf(&fname, "%s/hosts/%s", confbase, c->name);
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fp = fopen(fname, "r");
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if(fp) {
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c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
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fclose(fp);
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}
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free(fname);
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if(c->rsa_key)
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return 0;
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/* Try again with PEM_read_RSA_PUBKEY. */
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asprintf(&fname, "%s/hosts/%s", confbase, c->name);
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fp = fopen(fname, "r");
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if(fp) {
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c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
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fclose(fp);
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}
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free(fname);
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if(c->rsa_key)
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return 0;
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syslog(LOG_ERR, _("No public key for %s specified!"), c->name);
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return -1;
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2002-02-18 16:25:19 +00:00
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}
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int read_rsa_private_key(void)
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{
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2002-09-09 21:25:28 +00:00
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FILE *fp;
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char *fname, *key;
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cp();
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if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
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myself->connection->rsa_key = RSA_new();
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BN_hex2bn(&myself->connection->rsa_key->d, key);
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BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
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free(key);
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return 0;
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}
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if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
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asprintf(&fname, "%s/rsa_key.priv", confbase);
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if(is_safe_path(fname)) {
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fp = fopen(fname, "r");
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if(!fp) {
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syslog(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
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fname, strerror(errno));
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free(fname);
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return -1;
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}
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free(fname);
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myself->connection->rsa_key =
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PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
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fclose(fp);
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if(!myself->connection->rsa_key) {
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syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
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fname, strerror(errno));
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return -1;
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}
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return 0;
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}
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free(fname);
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return -1;
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2002-02-18 16:25:19 +00:00
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}
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/*
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Configure node_t myself and set up the local sockets (listen only)
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*/
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int setup_myself(void)
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{
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2002-09-09 21:25:28 +00:00
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config_t *cfg;
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subnet_t *subnet;
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char *name, *hostname, *mode, *afname, *cipher, *digest;
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char *address = NULL;
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struct addrinfo hint, *ai, *aip;
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int choice, err;
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cp();
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myself = new_node();
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myself->connection = new_connection();
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init_configuration(&myself->connection->config_tree);
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asprintf(&myself->hostname, _("MYSELF"));
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asprintf(&myself->connection->hostname, _("MYSELF"));
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myself->connection->options = 0;
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myself->connection->protocol_version = PROT_CURRENT;
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if(!get_config_string(lookup_config(config_tree, "Name"), &name)) { /* Not acceptable */
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syslog(LOG_ERR, _("Name for tinc daemon required!"));
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return -1;
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}
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if(check_id(name)) {
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syslog(LOG_ERR, _("Invalid name for myself!"));
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free(name);
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return -1;
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}
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myself->name = name;
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myself->connection->name = xstrdup(name);
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if(read_rsa_private_key())
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return -1;
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if(read_connection_config(myself->connection)) {
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syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
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return -1;
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}
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if(read_rsa_public_key(myself->connection))
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return -1;
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if(!get_config_string
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(lookup_config(myself->connection->config_tree, "Port"), &myport))
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asprintf(&myport, "655");
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/* Read in all the subnets specified in the host configuration file */
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cfg = lookup_config(myself->connection->config_tree, "Subnet");
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while(cfg) {
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if(!get_config_subnet(cfg, &subnet))
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return -1;
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subnet_add(myself, subnet);
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cfg = lookup_config_next(myself->connection->config_tree, cfg);
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}
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/* Check some options */
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if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
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if(choice)
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myself->options |= OPTION_INDIRECT;
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if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
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if(choice)
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myself->options |= OPTION_TCPONLY;
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if(get_config_bool
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(lookup_config(myself->connection->config_tree, "IndirectData"),
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&choice))
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if(choice)
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myself->options |= OPTION_INDIRECT;
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if(get_config_bool
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(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
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if(choice)
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myself->options |= OPTION_TCPONLY;
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if(myself->options & OPTION_TCPONLY)
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myself->options |= OPTION_INDIRECT;
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if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
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if(!strcasecmp(mode, "router"))
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routing_mode = RMODE_ROUTER;
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else if(!strcasecmp(mode, "switch"))
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routing_mode = RMODE_SWITCH;
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else if(!strcasecmp(mode, "hub"))
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routing_mode = RMODE_HUB;
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else {
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syslog(LOG_ERR, _("Invalid routing mode!"));
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return -1;
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}
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free(mode);
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} else
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routing_mode = RMODE_ROUTER;
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get_config_bool(lookup_config(config_tree, "PriorityInheritance"),
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&priorityinheritance);
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2002-03-01 15:14:29 +00:00
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#if !defined(SOL_IP) || !defined(IP_TOS)
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2002-09-09 21:25:28 +00:00
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if(priorityinheritance)
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syslog(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
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2002-03-01 15:14:29 +00:00
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#endif
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2002-03-01 12:25:58 +00:00
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2002-09-09 21:25:28 +00:00
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if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
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macexpire = 600;
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if(get_config_int
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(lookup_config(myself->connection->config_tree, "MaxTimeout"),
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&maxtimeout)) {
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if(maxtimeout <= 0) {
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syslog(LOG_ERR, _("Bogus maximum timeout!"));
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return -1;
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}
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} else
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maxtimeout = 900;
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if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
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if(!strcasecmp(afname, "IPv4"))
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addressfamily = AF_INET;
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else if(!strcasecmp(afname, "IPv6"))
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addressfamily = AF_INET6;
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else if(!strcasecmp(afname, "any"))
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addressfamily = AF_UNSPEC;
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else {
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syslog(LOG_ERR, _("Invalid address family!"));
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return -1;
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}
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free(afname);
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} else
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addressfamily = AF_INET;
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get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
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/* Generate packet encryption key */
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|
|
if(get_config_string
|
|
|
|
(lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
|
|
|
|
if(!strcasecmp(cipher, "none")) {
|
|
|
|
myself->cipher = NULL;
|
|
|
|
} else {
|
|
|
|
myself->cipher = EVP_get_cipherbyname(cipher);
|
|
|
|
|
|
|
|
if(!myself->cipher) {
|
|
|
|
syslog(LOG_ERR, _("Unrecognized cipher type!"));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
myself->cipher = EVP_bf_cbc();
|
|
|
|
|
|
|
|
if(myself->cipher)
|
|
|
|
myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
|
|
|
|
else
|
|
|
|
myself->keylength = 1;
|
|
|
|
|
|
|
|
myself->connection->outcipher = EVP_bf_ofb();
|
|
|
|
|
|
|
|
myself->key = (char *) xmalloc(myself->keylength);
|
|
|
|
RAND_pseudo_bytes(myself->key, myself->keylength);
|
|
|
|
|
|
|
|
if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
|
|
|
|
keylifetime = 3600;
|
|
|
|
|
|
|
|
keyexpires = now + keylifetime;
|
|
|
|
|
|
|
|
/* Check if we want to use message authentication codes... */
|
|
|
|
|
|
|
|
if(get_config_string
|
|
|
|
(lookup_config(myself->connection->config_tree, "Digest"), &digest)) {
|
|
|
|
if(!strcasecmp(digest, "none")) {
|
|
|
|
myself->digest = NULL;
|
|
|
|
} else {
|
|
|
|
myself->digest = EVP_get_digestbyname(digest);
|
|
|
|
|
|
|
|
if(!myself->digest) {
|
|
|
|
syslog(LOG_ERR, _("Unrecognized digest type!"));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
myself->digest = EVP_sha1();
|
|
|
|
|
|
|
|
myself->connection->outdigest = EVP_sha1();
|
|
|
|
|
|
|
|
if(get_config_int
|
|
|
|
(lookup_config(myself->connection->config_tree, "MACLength"),
|
|
|
|
&myself->maclength)) {
|
|
|
|
if(myself->digest) {
|
|
|
|
if(myself->maclength > myself->digest->md_size) {
|
|
|
|
syslog(LOG_ERR, _("MAC length exceeds size of digest!"));
|
|
|
|
return -1;
|
|
|
|
} else if(myself->maclength < 0) {
|
|
|
|
syslog(LOG_ERR, _("Bogus MAC length!"));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
myself->maclength = 4;
|
|
|
|
|
|
|
|
myself->connection->outmaclength = 0;
|
|
|
|
|
|
|
|
/* Compression */
|
|
|
|
|
|
|
|
if(get_config_int
|
|
|
|
(lookup_config(myself->connection->config_tree, "Compression"),
|
|
|
|
&myself->compression)) {
|
|
|
|
if(myself->compression < 0 || myself->compression > 9) {
|
|
|
|
syslog(LOG_ERR, _("Bogus compression level!"));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
myself->compression = 0;
|
|
|
|
|
|
|
|
myself->connection->outcompression = 0;
|
|
|
|
|
|
|
|
/* Done */
|
|
|
|
|
|
|
|
myself->nexthop = myself;
|
|
|
|
myself->via = myself;
|
|
|
|
myself->status.active = 1;
|
|
|
|
myself->status.reachable = 1;
|
|
|
|
node_add(myself);
|
|
|
|
|
|
|
|
graph();
|
|
|
|
|
|
|
|
/* Open sockets */
|
|
|
|
|
|
|
|
memset(&hint, 0, sizeof(hint));
|
|
|
|
|
|
|
|
get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
|
|
|
|
|
|
|
|
hint.ai_family = addressfamily;
|
|
|
|
hint.ai_socktype = SOCK_STREAM;
|
|
|
|
hint.ai_protocol = IPPROTO_TCP;
|
|
|
|
hint.ai_flags = AI_PASSIVE;
|
|
|
|
|
|
|
|
err = getaddrinfo(address, myport, &hint, &ai);
|
|
|
|
|
|
|
|
if(err || !ai) {
|
|
|
|
syslog(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
|
|
|
|
gai_strerror(err));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
listen_sockets = 0;
|
|
|
|
|
|
|
|
for(aip = ai; aip; aip = aip->ai_next) {
|
|
|
|
listen_socket[listen_sockets].tcp =
|
|
|
|
setup_listen_socket((sockaddr_t *) aip->ai_addr);
|
|
|
|
|
|
|
|
if(listen_socket[listen_sockets].tcp < 0)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
listen_socket[listen_sockets].udp =
|
|
|
|
setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
|
|
|
|
|
|
|
|
if(listen_socket[listen_sockets].udp < 0)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if(debug_lvl >= DEBUG_CONNECTIONS) {
|
|
|
|
hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
|
|
|
|
syslog(LOG_NOTICE, _("Listening on %s"), hostname);
|
|
|
|
free(hostname);
|
|
|
|
}
|
|
|
|
|
|
|
|
listen_socket[listen_sockets].sa.sa = *aip->ai_addr;
|
|
|
|
listen_sockets++;
|
2002-02-26 23:26:41 +00:00
|
|
|
}
|
2002-03-01 13:18:54 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
freeaddrinfo(ai);
|
|
|
|
|
|
|
|
if(listen_sockets)
|
|
|
|
syslog(LOG_NOTICE, _("Ready"));
|
|
|
|
else {
|
|
|
|
syslog(LOG_ERR, _("Unable to create any listening socket!"));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
setup all initial network connections
|
|
|
|
*/
|
|
|
|
int setup_network_connections(void)
|
|
|
|
{
|
2003-01-14 12:53:59 +00:00
|
|
|
char *envp[5];
|
2002-09-09 21:25:28 +00:00
|
|
|
int i;
|
|
|
|
|
|
|
|
cp();
|
|
|
|
|
|
|
|
now = time(NULL);
|
|
|
|
|
|
|
|
init_connections();
|
|
|
|
init_subnets();
|
|
|
|
init_nodes();
|
|
|
|
init_edges();
|
|
|
|
init_events();
|
|
|
|
init_requests();
|
|
|
|
|
|
|
|
if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) {
|
|
|
|
if(pingtimeout < 1) {
|
|
|
|
pingtimeout = 86400;
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
pingtimeout = 60;
|
|
|
|
|
|
|
|
if(setup_device() < 0)
|
|
|
|
return -1;
|
|
|
|
|
2003-01-14 12:53:59 +00:00
|
|
|
if(setup_myself() < 0)
|
|
|
|
return -1;
|
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Run tinc-up script to further initialize the tap interface */
|
|
|
|
asprintf(&envp[0], "NETNAME=%s", netname ? : "");
|
|
|
|
asprintf(&envp[1], "DEVICE=%s", device ? : "");
|
|
|
|
asprintf(&envp[2], "INTERFACE=%s", interface ? : "");
|
2003-01-14 12:53:59 +00:00
|
|
|
asprintf(&envp[3], "NAME=%s", myself->name);
|
|
|
|
envp[4] = NULL;
|
2002-09-09 21:25:28 +00:00
|
|
|
|
|
|
|
execute_script("tinc-up", envp);
|
|
|
|
|
2003-01-14 12:53:59 +00:00
|
|
|
for(i = 0; i < 5; i++)
|
2002-09-09 21:25:28 +00:00
|
|
|
free(envp[i]);
|
|
|
|
|
|
|
|
try_outgoing_connections();
|
|
|
|
|
|
|
|
return 0;
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
close all open network connections
|
|
|
|
*/
|
|
|
|
void close_network_connections(void)
|
|
|
|
{
|
2002-09-09 21:25:28 +00:00
|
|
|
avl_node_t *node, *next;
|
|
|
|
connection_t *c;
|
2003-01-14 12:53:59 +00:00
|
|
|
char *envp[5];
|
2002-09-09 21:25:28 +00:00
|
|
|
int i;
|
|
|
|
|
|
|
|
cp();
|
|
|
|
|
|
|
|
for(node = connection_tree->head; node; node = next) {
|
|
|
|
next = node->next;
|
|
|
|
c = (connection_t *) node->data;
|
|
|
|
|
|
|
|
if(c->outgoing)
|
|
|
|
free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL;
|
|
|
|
terminate_connection(c, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
if(myself && myself->connection)
|
|
|
|
terminate_connection(myself->connection, 0);
|
|
|
|
|
|
|
|
for(i = 0; i < listen_sockets; i++) {
|
|
|
|
close(listen_socket[i].tcp);
|
|
|
|
close(listen_socket[i].udp);
|
|
|
|
}
|
|
|
|
|
|
|
|
exit_requests();
|
|
|
|
exit_events();
|
|
|
|
exit_edges();
|
|
|
|
exit_subnets();
|
|
|
|
exit_nodes();
|
|
|
|
exit_connections();
|
|
|
|
|
|
|
|
asprintf(&envp[0], "NETNAME=%s", netname ? : "");
|
|
|
|
asprintf(&envp[1], "DEVICE=%s", device ? : "");
|
|
|
|
asprintf(&envp[2], "INTERFACE=%s", interface ? : "");
|
2003-01-14 12:53:59 +00:00
|
|
|
asprintf(&envp[3], "NAME=%s", myself->name);
|
|
|
|
envp[4] = NULL;
|
2002-09-09 21:25:28 +00:00
|
|
|
|
|
|
|
execute_script("tinc-down", envp);
|
|
|
|
|
|
|
|
for(i = 0; i < 4; i++)
|
|
|
|
free(envp[i]);
|
|
|
|
|
|
|
|
close_device();
|
|
|
|
|
|
|
|
return;
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|