tinc/src/net_setup.c

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/*
net_setup.c -- Setup.
Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl>,
2000-2002 Guus Sliepen <guus@sliepen.eu.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: net_setup.c,v 1.1.2.28 2003/01/14 12:53:59 guus Exp $
*/
#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/types.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/ioctl.h>
/* SunOS really wants sys/socket.h BEFORE net/if.h,
and FreeBSD wants these lines below the rest. */
#include <arpa/inet.h>
#include <sys/socket.h>
#include <net/if.h>
#ifdef HAVE_NETINET_IN_SYSTM_H
#include <netinet/in_systm.h>
#endif
#ifdef HAVE_NETINET_IP_H
#include <netinet/ip.h>
#endif
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#endif
#include <openssl/pem.h>
#include <openssl/rsa.h>
#include <openssl/rand.h>
#include <utils.h>
#include <xalloc.h>
#include <avl_tree.h>
#include <list.h>
#include "conf.h"
#include "connection.h"
#include "meta.h"
#include "net.h"
#include "netutl.h"
#include "process.h"
#include "protocol.h"
#include "subnet.h"
#include "graph.h"
#include "process.h"
#include "route.h"
#include "device.h"
#include "event.h"
#include "system.h"
char *myport;
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int read_rsa_public_key(connection_t *c)
{
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FILE *fp;
char *fname;
char *key;
cp();
if(!c->rsa_key)
c->rsa_key = RSA_new();
/* First, check for simple PublicKey statement */
if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) {
BN_hex2bn(&c->rsa_key->n, key);
BN_hex2bn(&c->rsa_key->e, "FFFF");
free(key);
return 0;
}
/* Else, check for PublicKeyFile statement and read it */
if(get_config_string
(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
if(is_safe_path(fname)) {
fp = fopen(fname, "r");
if(!fp) {
syslog(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
fname, strerror(errno));
free(fname);
return -1;
}
free(fname);
c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
fclose(fp);
if(c->rsa_key)
return 0; /* Woohoo. */
/* If it fails, try PEM_read_RSA_PUBKEY. */
fp = fopen(fname, "r");
if(!fp) {
syslog(LOG_ERR, _("Error reading RSA public key file `%s': %s"),
fname, strerror(errno));
free(fname);
return -1;
}
free(fname);
c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
fclose(fp);
if(c->rsa_key)
return 0;
syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
fname, strerror(errno));
return -1;
} else {
free(fname);
return -1;
}
}
/* Else, check if a harnessed public key is in the config file */
asprintf(&fname, "%s/hosts/%s", confbase, c->name);
fp = fopen(fname, "r");
if(fp) {
c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
fclose(fp);
}
free(fname);
if(c->rsa_key)
return 0;
/* Try again with PEM_read_RSA_PUBKEY. */
asprintf(&fname, "%s/hosts/%s", confbase, c->name);
fp = fopen(fname, "r");
if(fp) {
c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
fclose(fp);
}
free(fname);
if(c->rsa_key)
return 0;
syslog(LOG_ERR, _("No public key for %s specified!"), c->name);
return -1;
}
int read_rsa_private_key(void)
{
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FILE *fp;
char *fname, *key;
cp();
if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
myself->connection->rsa_key = RSA_new();
BN_hex2bn(&myself->connection->rsa_key->d, key);
BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
free(key);
return 0;
}
if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
asprintf(&fname, "%s/rsa_key.priv", confbase);
if(is_safe_path(fname)) {
fp = fopen(fname, "r");
if(!fp) {
syslog(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
fname, strerror(errno));
free(fname);
return -1;
}
free(fname);
myself->connection->rsa_key =
PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
fclose(fp);
if(!myself->connection->rsa_key) {
syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
fname, strerror(errno));
return -1;
}
return 0;
}
free(fname);
return -1;
}
/*
Configure node_t myself and set up the local sockets (listen only)
*/
int setup_myself(void)
{
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config_t *cfg;
subnet_t *subnet;
char *name, *hostname, *mode, *afname, *cipher, *digest;
char *address = NULL;
struct addrinfo hint, *ai, *aip;
int choice, err;
cp();
myself = new_node();
myself->connection = new_connection();
init_configuration(&myself->connection->config_tree);
asprintf(&myself->hostname, _("MYSELF"));
asprintf(&myself->connection->hostname, _("MYSELF"));
myself->connection->options = 0;
myself->connection->protocol_version = PROT_CURRENT;
if(!get_config_string(lookup_config(config_tree, "Name"), &name)) { /* Not acceptable */
syslog(LOG_ERR, _("Name for tinc daemon required!"));
return -1;
}
if(check_id(name)) {
syslog(LOG_ERR, _("Invalid name for myself!"));
free(name);
return -1;
}
myself->name = name;
myself->connection->name = xstrdup(name);
if(read_rsa_private_key())
return -1;
if(read_connection_config(myself->connection)) {
syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
return -1;
}
if(read_rsa_public_key(myself->connection))
return -1;
if(!get_config_string
(lookup_config(myself->connection->config_tree, "Port"), &myport))
asprintf(&myport, "655");
/* Read in all the subnets specified in the host configuration file */
cfg = lookup_config(myself->connection->config_tree, "Subnet");
while(cfg) {
if(!get_config_subnet(cfg, &subnet))
return -1;
subnet_add(myself, subnet);
cfg = lookup_config_next(myself->connection->config_tree, cfg);
}
/* Check some options */
if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
if(choice)
myself->options |= OPTION_INDIRECT;
if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
if(choice)
myself->options |= OPTION_TCPONLY;
if(get_config_bool
(lookup_config(myself->connection->config_tree, "IndirectData"),
&choice))
if(choice)
myself->options |= OPTION_INDIRECT;
if(get_config_bool
(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
if(choice)
myself->options |= OPTION_TCPONLY;
if(myself->options & OPTION_TCPONLY)
myself->options |= OPTION_INDIRECT;
if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
if(!strcasecmp(mode, "router"))
routing_mode = RMODE_ROUTER;
else if(!strcasecmp(mode, "switch"))
routing_mode = RMODE_SWITCH;
else if(!strcasecmp(mode, "hub"))
routing_mode = RMODE_HUB;
else {
syslog(LOG_ERR, _("Invalid routing mode!"));
return -1;
}
free(mode);
} else
routing_mode = RMODE_ROUTER;
get_config_bool(lookup_config(config_tree, "PriorityInheritance"),
&priorityinheritance);
#if !defined(SOL_IP) || !defined(IP_TOS)
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if(priorityinheritance)
syslog(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
#endif
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if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
macexpire = 600;
if(get_config_int
(lookup_config(myself->connection->config_tree, "MaxTimeout"),
&maxtimeout)) {
if(maxtimeout <= 0) {
syslog(LOG_ERR, _("Bogus maximum timeout!"));
return -1;
}
} else
maxtimeout = 900;
if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
if(!strcasecmp(afname, "IPv4"))
addressfamily = AF_INET;
else if(!strcasecmp(afname, "IPv6"))
addressfamily = AF_INET6;
else if(!strcasecmp(afname, "any"))
addressfamily = AF_UNSPEC;
else {
syslog(LOG_ERR, _("Invalid address family!"));
return -1;
}
free(afname);
} else
addressfamily = AF_INET;
get_config_bool(lookup_config(config_tree, "Hostnames"), &hostnames);
/* Generate packet encryption key */
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++;
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}
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freeaddrinfo(ai);
if(listen_sockets)
syslog(LOG_NOTICE, _("Ready"));
else {
syslog(LOG_ERR, _("Unable to create any listening socket!"));
return -1;
}
return 0;
}
/*
setup all initial network connections
*/
int setup_network_connections(void)
{
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char *envp[5];
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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;
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if(setup_myself() < 0)
return -1;
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/* 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 ? : "");
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asprintf(&envp[3], "NAME=%s", myself->name);
envp[4] = NULL;
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execute_script("tinc-up", envp);
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for(i = 0; i < 5; i++)
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free(envp[i]);
try_outgoing_connections();
return 0;
}
/*
close all open network connections
*/
void close_network_connections(void)
{
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avl_node_t *node, *next;
connection_t *c;
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char *envp[5];
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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 ? : "");
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asprintf(&envp[3], "NAME=%s", myself->name);
envp[4] = NULL;
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execute_script("tinc-down", envp);
for(i = 0; i < 4; i++)
free(envp[i]);
close_device();
return;
}