Copyright (C) 1998-2005 Ivo Timmermans,
2000-2010 Guus Sliepen <guus@tinc-vpn.org>
2006 Scott Lamb <slamb@slamb.org>
+ 2010 Brandon Black <blblack@gmail.com>
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
#include "system.h"
-#include <openssl/pem.h>
-#include <openssl/rsa.h>
-#include <openssl/rand.h>
-#include <openssl/err.h>
-#include <openssl/evp.h>
-
-#include "avl_tree.h"
+#include "splay_tree.h"
+#include "cipher.h"
#include "conf.h"
#include "connection.h"
+#include "control.h"
#include "device.h"
-#include "event.h"
+#include "digest.h"
#include "graph.h"
#include "logger.h"
#include "net.h"
#include "process.h"
#include "protocol.h"
#include "route.h"
+#include "rsa.h"
#include "subnet.h"
#include "utils.h"
#include "xalloc.h"
char *myport;
+static struct event device_ev;
bool read_rsa_public_key(connection_t *c) {
FILE *fp;
char *fname;
- char *key;
-
- if(!c->rsa_key) {
- c->rsa_key = RSA_new();
-// RSA_blinding_on(c->rsa_key, NULL);
- }
+ char *n;
+ bool result;
/* 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 true;
+ if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) {
+ result = rsa_set_hex_public_key(&c->rsa, n, "FFFF");
+ free(n);
+ return result;
}
/* Else, check for PublicKeyFile statement and read it */
- if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) {
- fp = fopen(fname, "r");
-
- if(!fp) {
- logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
- fname, strerror(errno));
- free(fname);
- return false;
- }
-
- free(fname);
- c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
- fclose(fp);
-
- if(c->rsa_key)
- return true; /* Woohoo. */
-
- /* If it fails, try PEM_read_RSA_PUBKEY. */
- fp = fopen(fname, "r");
-
- if(!fp) {
- logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
- fname, strerror(errno));
- free(fname);
- return false;
- }
-
- free(fname);
- c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
- fclose(fp);
+ if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
+ xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
- if(c->rsa_key) {
-// RSA_blinding_on(c->rsa_key, NULL);
- return true;
- }
+ fp = fopen(fname, "r");
- logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s",
+ if(!fp) {
+ logger(LOG_ERR, "Error reading RSA public key file `%s': %s",
fname, strerror(errno));
+ free(fname);
return false;
}
- /* Else, check if a harnessed public key is in the config file */
-
- xasprintf(&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 true;
-
- /* Try again with PEM_read_RSA_PUBKEY. */
-
- xasprintf(&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);
-// RSA_blinding_on(c->rsa_key, NULL);
- fclose(fp);
- }
+ result = rsa_read_pem_public_key(&c->rsa, fp);
+ fclose(fp);
+ if(!result)
+ logger(LOG_ERR, "Reading RSA public key file `%s' failed: %s", fname, strerror(errno));
free(fname);
-
- if(c->rsa_key)
- return true;
-
- logger(LOG_ERR, "No public key for %s specified!", c->name);
-
- return false;
+ return result;
}
-bool read_rsa_private_key(void) {
+bool read_rsa_private_key() {
FILE *fp;
- char *fname, *key, *pubkey;
- struct stat s;
+ char *fname;
+ char *n, *d;
+ bool result;
- if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
- if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &pubkey)) {
+ /* First, check for simple PrivateKey statement */
+
+ if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
+ if(!get_config_string(lookup_config(config_tree, "PublicKey"), &n)) {
logger(LOG_ERR, "PrivateKey used but no PublicKey found!");
+ free(d);
return false;
}
- myself->connection->rsa_key = RSA_new();
-// RSA_blinding_on(myself->connection->rsa_key, NULL);
- BN_hex2bn(&myself->connection->rsa_key->d, key);
- BN_hex2bn(&myself->connection->rsa_key->n, pubkey);
- BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
- free(key);
- free(pubkey);
+ result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
+ free(n);
+ free(d);
return true;
}
+ /* Else, check for PrivateKeyFile statement and read it */
+
if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
xasprintf(&fname, "%s/rsa_key.priv", confbase);
}
#if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
+ struct stat s;
+
if(fstat(fileno(fp), &s)) {
- logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'",
- fname, strerror(errno));
+ logger(LOG_ERR, "Could not stat RSA private key file `%s': %s'", fname, strerror(errno));
free(fname);
return false;
}
logger(LOG_WARNING, "Warning: insecure file permissions for RSA private key file `%s'!", fname);
#endif
- myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
+ result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
fclose(fp);
- if(!myself->connection->rsa_key) {
- logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s",
- fname, strerror(errno));
- free(fname);
- return false;
+ if(!result)
+ logger(LOG_ERR, "Reading RSA private key file `%s' failed: %s", fname, strerror(errno));
+ free(fname);
+ return result;
+}
+
+static struct event keyexpire_event;
+
+static void keyexpire_handler(int fd, short events, void *data) {
+ regenerate_key();
+}
+
+void regenerate_key() {
+ if(timeout_initialized(&keyexpire_event)) {
+ ifdebug(STATUS) logger(LOG_INFO, "Expiring symmetric keys");
+ event_del(&keyexpire_event);
+ send_key_changed(broadcast, myself);
+ } else {
+ timeout_set(&keyexpire_event, keyexpire_handler, NULL);
}
- free(fname);
- return true;
+ event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
}
/*
Read Subnets from all host config files
*/
-static void load_all_subnets(void) {
+void load_all_subnets(void) {
DIR *dir;
struct dirent *ent;
char *dname;
char *fname;
- avl_tree_t *config_tree;
+ splay_tree_t *config_tree;
config_t *cfg;
- subnet_t *s;
+ subnet_t *s, *s2;
node_t *n;
bool result;
continue;
n = lookup_node(ent->d_name);
- if(n)
- continue;
-
#ifdef _DIRENT_HAVE_D_TYPE
//if(ent->d_type != DT_REG)
// continue;
if(!result)
continue;
- n = new_node();
- n->name = xstrdup(ent->d_name);
- node_add(n);
+ if(!n) {
+ n = new_node();
+ n->name = xstrdup(ent->d_name);
+ node_add(n);
+ }
for(cfg = lookup_config(config_tree, "Subnet"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
if(!get_config_subnet(cfg, &s))
continue;
- subnet_add(n, s);
+ if((s2 = lookup_subnet(n, s))) {
+ s2->expires = -1;
+ } else {
+ subnet_add(n, s);
+ }
}
exit_configuration(&config_tree);
config_t *cfg;
subnet_t *subnet;
char *name, *hostname, *mode, *afname, *cipher, *digest;
+ char *fname = NULL;
char *address = NULL;
char *envp[5];
struct addrinfo *ai, *aip, hint = {0};
bool choice;
int i, err;
+ int replaywin_int;
myself = new_node();
myself->connection = new_connection();
- init_configuration(&myself->connection->config_tree);
myself->hostname = xstrdup("MYSELF");
myself->connection->hostname = xstrdup("MYSELF");
myself->name = name;
myself->connection->name = xstrdup(name);
-
- if(!read_connection_config(myself->connection)) {
- logger(LOG_ERR, "Cannot open host configuration file for myself!");
- return false;
- }
+ xasprintf(&fname, "%s/hosts/%s", confbase, name);
+ read_config_options(config_tree, name);
+ read_config_file(config_tree, fname);
+ free(fname);
if(!read_rsa_private_key())
return false;
- if(!get_config_string(lookup_config(config_tree, "Port"), &myport)
- && !get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
+ if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
myport = xstrdup("655");
if(!atoi(myport)) {
/* Read in all the subnets specified in the host configuration file */
- cfg = lookup_config(myself->connection->config_tree, "Subnet");
+ cfg = lookup_config(config_tree, "Subnet");
while(cfg) {
if(!get_config_subnet(cfg, &subnet))
subnet_add(myself, subnet);
- cfg = lookup_config_next(myself->connection->config_tree, cfg);
+ cfg = lookup_config_next(config_tree, cfg);
}
/* Check some options */
if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice)
myself->options |= OPTION_TCPONLY;
- if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice)
- myself->options |= OPTION_INDIRECT;
-
- if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice)
- myself->options |= OPTION_TCPONLY;
-
if(myself->options & OPTION_TCPONLY)
myself->options |= OPTION_INDIRECT;
}
choice = true;
- get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice);
get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice);
if(choice)
myself->options |= OPTION_PMTU_DISCOVERY;
choice = true;
get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice);
- get_config_bool(lookup_config(myself->connection->config_tree, "ClampMSS"), &choice);
if(choice)
myself->options |= OPTION_CLAMP_MSS;
} else
maxtimeout = 900;
+ if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) {
+ if(udp_rcvbuf <= 0) {
+ logger(LOG_ERR, "UDPRcvBuf cannot be negative!");
+ return false;
+ }
+ }
+
+ if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) {
+ if(udp_sndbuf <= 0) {
+ logger(LOG_ERR, "UDPSndBuf cannot be negative!");
+ return false;
+ }
+ }
+
+ if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) {
+ if(replaywin_int < 0) {
+ logger(LOG_ERR, "ReplayWindow cannot be negative!");
+ return false;
+ }
+ replaywin = (unsigned)replaywin_int;
+ }
+
if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) {
if(!strcasecmp(afname, "IPv4"))
addressfamily = AF_INET;
/* Generate packet encryption key */
- if(get_config_string
- (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) {
- if(!strcasecmp(cipher, "none")) {
- myself->incipher = NULL;
- } else {
- myself->incipher = EVP_get_cipherbyname(cipher);
+ if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher))
+ cipher = xstrdup("blowfish");
- if(!myself->incipher) {
- logger(LOG_ERR, "Unrecognized cipher type!");
- return false;
- }
- }
- } else
- myself->incipher = EVP_bf_cbc();
-
- if(myself->incipher)
- myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
- else
- myself->inkeylength = 1;
-
- myself->connection->outcipher = EVP_bf_ofb();
+ if(!cipher_open_by_name(&myself->incipher, cipher)) {
+ logger(LOG_ERR, "Unrecognized cipher type!");
+ return false;
+ }
if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
keylifetime = 3600;
- keyexpires = now + keylifetime;
-
+ regenerate_key();
+
/* 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->indigest = NULL;
- } else {
- myself->indigest = EVP_get_digestbyname(digest);
+ if(!get_config_string(lookup_config(config_tree, "Digest"), &digest))
+ digest = xstrdup("sha1");
- if(!myself->indigest) {
- logger(LOG_ERR, "Unrecognized digest type!");
- return false;
- }
- }
- } else
- myself->indigest = EVP_sha1();
-
- myself->connection->outdigest = EVP_sha1();
-
- if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->inmaclength)) {
- if(myself->indigest) {
- if(myself->inmaclength > myself->indigest->md_size) {
- logger(LOG_ERR, "MAC length exceeds size of digest!");
- return false;
- } else if(myself->inmaclength < 0) {
- logger(LOG_ERR, "Bogus MAC length!");
- return false;
- }
- }
- } else
- myself->inmaclength = 4;
+ int maclength = 4;
+ get_config_int(lookup_config(config_tree, "MACLength"), &maclength);
- myself->connection->outmaclength = 0;
+ if(maclength < 0) {
+ logger(LOG_ERR, "Bogus MAC length!");
+ return false;
+ }
+
+ if(!digest_open_by_name(&myself->indigest, digest, maclength)) {
+ logger(LOG_ERR, "Unrecognized digest type!");
+ return false;
+ }
/* Compression */
- if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->incompression)) {
+ if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) {
if(myself->incompression < 0 || myself->incompression > 11) {
logger(LOG_ERR, "Bogus compression level!");
return false;
if(!setup_device())
return false;
+ if(device_fd >= 0) {
+ event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL);
+
+ if (event_add(&device_ev, NULL) < 0) {
+ logger(LOG_ERR, "event_add failed: %s", strerror(errno));
+ close_device();
+ return false;
+ }
+ }
+
/* Run tinc-up script to further initialize the tap interface */
xasprintf(&envp[0], "NETNAME=%s", netname ? : "");
xasprintf(&envp[1], "DEVICE=%s", device ? : "");
execute_script("tinc-up", envp);
- for(i = 0; i < 5; i++)
+ for(i = 0; i < 4; i++)
free(envp[i]);
/* Run subnet-up scripts for our own subnets */
listen_socket[listen_sockets].udp =
setup_vpn_in_socket((sockaddr_t *) aip->ai_addr);
- if(listen_socket[listen_sockets].udp < 0)
+ if(listen_socket[listen_sockets].udp < 0) {
+ close(listen_socket[listen_sockets].tcp);
continue;
+ }
+
+ event_set(&listen_socket[listen_sockets].ev_tcp,
+ listen_socket[listen_sockets].tcp,
+ EV_READ|EV_PERSIST,
+ handle_new_meta_connection, NULL);
+ if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) {
+ logger(LOG_ERR, "event_add failed: %s", strerror(errno));
+ abort();
+ }
+
+ event_set(&listen_socket[listen_sockets].ev_udp,
+ listen_socket[listen_sockets].udp,
+ EV_READ|EV_PERSIST,
+ handle_incoming_vpn_data, NULL);
+ if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) {
+ logger(LOG_ERR, "event_add failed: %s", strerror(errno));
+ abort();
+ }
ifdebug(CONNECTIONS) {
hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
listen_sockets++;
+
+ if(listen_sockets >= MAXSOCKETS) {
+ logger(LOG_WARNING, "Maximum of %d listening sockets reached", MAXSOCKETS);
+ break;
+ }
}
freeaddrinfo(ai);
initialize network
*/
bool setup_network(void) {
- now = time(NULL);
-
- init_events();
init_connections();
init_subnets();
init_nodes();
close all open network connections
*/
void close_network_connections(void) {
- avl_node_t *node, *next;
+ splay_node_t *node, *next;
connection_t *c;
char *envp[5];
int i;
for(node = connection_tree->head; node; node = next) {
next = node->next;
c = node->data;
- c->outgoing = NULL;
+ c->outgoing = false;
terminate_connection(c, false);
}
- for(list_node_t *node = outgoing_list->head; node; node = node->next) {
- outgoing_t *outgoing = node->data;
-
- if(outgoing->event)
- event_del(outgoing->event);
- }
-
list_delete_list(outgoing_list);
if(myself && myself->connection) {
}
for(i = 0; i < listen_sockets; i++) {
+ event_del(&listen_socket[i].ev_tcp);
+ event_del(&listen_socket[i].ev_udp);
close(listen_socket[i].tcp);
close(listen_socket[i].udp);
}
exit_subnets();
exit_nodes();
exit_connections();
- exit_events();
execute_script("tinc-down", envp);
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