X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet_setup.c;h=9a0c78bdcf8c3ab6e201c7e381828a2c38447e54;hb=103543aa2c15d9f1e2aa313a2e593a7524cce484;hp=12b09a91045e716af1165804ba54cf834ff67da2;hpb=a227843b739d279b63adcf3736ebb03d856080c4;p=tinc

diff --git a/src/net_setup.c b/src/net_setup.c
index 12b09a91..9a0c78bd 100644
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -1,7 +1,8 @@
 /*
     net_setup.c -- Setup.
     Copyright (C) 1998-2005 Ivo Timmermans,
-                  2000-2009 Guus Sliepen <guus@tinc-vpn.org>
+                  2000-2010 Guus Sliepen <guus@tinc-vpn.org>
+                  2006      Scott Lamb <slamb@slamb.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
@@ -20,17 +21,13 @@
 
 #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"
@@ -38,166 +35,182 @@
 #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;
+
+	/* First, check for simple PrivateKey statement */
 
-	if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
-		if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &pubkey)) {
-			logger(LOG_ERR, _("PrivateKey used but no PublicKey found!"));
+	if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) {
+		if(!get_config_string(lookup_config(myself->connection->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);
 
 	fp = fopen(fname, "r");
 
 	if(!fp) {
-		logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
+		logger(LOG_ERR, "Error reading RSA private key file `%s': %s",
 			   fname, strerror(errno));
 		free(fname);
 		return false;
 	}
 
 #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;
 	}
 
 	if(s.st_mode & ~0100700)
-		logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
+		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));
+	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);
+	}
+
+	event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
+}
+
+/*
+  Read Subnets from all host config files
+*/
+static void load_all_subnets(void) {
+	DIR *dir;
+	struct dirent *ent;
+	char *dname;
+	char *fname;
+	avl_tree_t *config_tree;
+	config_t *cfg;
+	subnet_t *s;
+	node_t *n;
+	bool result;
+
+	xasprintf(&dname, "%s/hosts", confbase);
+	dir = opendir(dname);
+	if(!dir) {
+		logger(LOG_ERR, "Could not open %s: %s", dname, strerror(errno));
+		free(dname);
+		return;
+	}
+
+	while((ent = readdir(dir))) {
+		if(!check_id(ent->d_name))
+			continue;
+
+		n = lookup_node(ent->d_name);
+		if(n)
+			continue;
+
+		#ifdef _DIRENT_HAVE_D_TYPE
+		//if(ent->d_type != DT_REG)
+		//	continue;
+		#endif
+
+		xasprintf(&fname, "%s/hosts/%s", confbase, ent->d_name);
+		init_configuration(&config_tree);
+		result = read_config_file(config_tree, fname);
 		free(fname);
-		return false;
+		if(!result)
+			continue;
+
+		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);
+		}
+
+		exit_configuration(&config_tree);
 	}
 
-	free(fname);
-	return true;
+	closedir(dir);
 }
 
 /*
@@ -217,19 +230,19 @@ bool setup_myself(void) {
 	myself->connection = new_connection();
 	init_configuration(&myself->connection->config_tree);
 
-	xasprintf(&myself->hostname, _("MYSELF"));
-	xasprintf(&myself->connection->hostname, _("MYSELF"));
+	myself->hostname = xstrdup("MYSELF");
+	myself->connection->hostname = xstrdup("MYSELF");
 
 	myself->connection->options = 0;
 	myself->connection->protocol_version = PROT_CURRENT;
 
 	if(!get_config_string(lookup_config(config_tree, "Name"), &name)) {	/* Not acceptable */
-		logger(LOG_ERR, _("Name for tinc daemon required!"));
+		logger(LOG_ERR, "Name for tinc daemon required!");
 		return false;
 	}
 
 	if(!check_id(name)) {
-		logger(LOG_ERR, _("Invalid name for myself!"));
+		logger(LOG_ERR, "Invalid name for myself!");
 		free(name);
 		return false;
 	}
@@ -238,15 +251,16 @@ bool setup_myself(void) {
 	myself->connection->name = xstrdup(name);
 
 	if(!read_connection_config(myself->connection)) {
-		logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
+		logger(LOG_ERR, "Cannot open host configuration file for myself!");
 		return false;
 	}
 
 	if(!read_rsa_private_key())
 		return false;
 
-	if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
-		xasprintf(&myport, "655");
+	if(!get_config_string(lookup_config(config_tree, "Port"), &myport)
+			&& !get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport))
+		myport = xstrdup("655");
 
 	/* Read in all the subnets specified in the host configuration file */
 
@@ -278,7 +292,10 @@ bool setup_myself(void) {
 	if(myself->options & OPTION_TCPONLY)
 		myself->options |= OPTION_INDIRECT;
 
+	get_config_bool(lookup_config(config_tree, "DirectOnly"), &directonly);
+	get_config_bool(lookup_config(config_tree, "StrictSubnets"), &strictsubnets);
 	get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
+	strictsubnets |= tunnelserver;
 
 	if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 		if(!strcasecmp(mode, "router"))
@@ -288,25 +305,43 @@ bool setup_myself(void) {
 		else if(!strcasecmp(mode, "hub"))
 			routing_mode = RMODE_HUB;
 		else {
-			logger(LOG_ERR, _("Invalid routing mode!"));
+			logger(LOG_ERR, "Invalid routing mode!");
 			return false;
 		}
 		free(mode);
-	} else
-		routing_mode = RMODE_ROUTER;
+	}
 
-	// Enable PMTUDiscovery by default if we are in router mode.
+	if(get_config_string(lookup_config(config_tree, "Forwarding"), &mode)) {
+		if(!strcasecmp(mode, "off"))
+			forwarding_mode = FMODE_OFF;
+		else if(!strcasecmp(mode, "internal"))
+			forwarding_mode = FMODE_INTERNAL;
+		else if(!strcasecmp(mode, "kernel"))
+			forwarding_mode = FMODE_KERNEL;
+		else {
+			logger(LOG_ERR, "Invalid forwarding mode!");
+			return false;
+		}
+		free(mode);
+	}
 
-	choice = routing_mode == RMODE_ROUTER;
+	choice = true;
 	get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice);
-	if(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;
+
 	get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 
 #if !defined(SOL_IP) || !defined(IP_TOS)
 	if(priorityinheritance)
-		logger(LOG_WARNING, _("%s not supported on this platform"), "PriorityInheritance");
+		logger(LOG_WARNING, "%s not supported on this platform", "PriorityInheritance");
 #endif
 
 	if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire))
@@ -314,7 +349,7 @@ bool setup_myself(void) {
 
 	if(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 		if(maxtimeout <= 0) {
-			logger(LOG_ERR, _("Bogus maximum timeout!"));
+			logger(LOG_ERR, "Bogus maximum timeout!");
 			return false;
 		}
 	} else
@@ -328,7 +363,7 @@ bool setup_myself(void) {
 		else if(!strcasecmp(afname, "any"))
 			addressfamily = AF_UNSPEC;
 		else {
-			logger(LOG_ERR, _("Invalid address family!"));
+			logger(LOG_ERR, "Invalid address family!");
 			return false;
 		}
 		free(afname);
@@ -338,71 +373,42 @@ bool setup_myself(void) {
 
 	/* 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(!myself->incipher) {
-				logger(LOG_ERR, _("Unrecognized cipher type!"));
-				return false;
-			}
-		}
-	} else
-		myself->incipher = EVP_aes_256_cbc();
-
-	if(myself->incipher)
-		myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len;
-	else
-		myself->inkeylength = 1;
+	if(!get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
+		cipher = xstrdup("blowfish");
 
-	myself->connection->outcipher = EVP_aes_256_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(myself->connection->config_tree, "Digest"), &digest))
+		digest = xstrdup("sha1");
 
-			if(!myself->indigest) {
-				logger(LOG_ERR, _("Unrecognized digest type!"));
-				return false;
-			}
-		}
-	} else
-		myself->indigest = EVP_sha256();
-
-	myself->connection->outdigest = EVP_sha256();
-
-	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(myself->connection->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(myself->incompression < 0 || myself->incompression > 11) {
-			logger(LOG_ERR, _("Bogus compression level!"));
+			logger(LOG_ERR, "Bogus compression level!");
 			return false;
 		}
 	} else
@@ -419,11 +425,24 @@ bool setup_myself(void) {
 
 	graph();
 
+	if(strictsubnets)
+		load_all_subnets();
+
 	/* Open device */
 
 	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 ? : "");
@@ -452,7 +471,7 @@ bool setup_myself(void) {
 	err = getaddrinfo(address, myport, &hint, &ai);
 
 	if(err || !ai) {
-		logger(LOG_ERR, _("System call `%s' failed: %s"), "getaddrinfo",
+		logger(LOG_ERR, "System call `%s' failed: %s", "getaddrinfo",
 			   gai_strerror(err));
 		return false;
 	}
@@ -469,25 +488,50 @@ bool setup_myself(void) {
 		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_EMERG, "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_EMERG, "event_add failed: %s", strerror(errno));
+			abort();
+		}
 
 		ifdebug(CONNECTIONS) {
 			hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
-			logger(LOG_NOTICE, _("Listening on %s"), hostname);
+			logger(LOG_NOTICE, "Listening on %s", hostname);
 			free(hostname);
 		}
 
 		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);
 
 	if(listen_sockets)
-		logger(LOG_NOTICE, _("Ready"));
+		logger(LOG_NOTICE, "Ready");
 	else {
-		logger(LOG_ERR, _("Unable to create any listening socket!"));
+		logger(LOG_ERR, "Unable to create any listening socket!");
 		return false;
 	}
 
@@ -498,9 +542,6 @@ bool setup_myself(void) {
   initialize network
 */
 bool setup_network(void) {
-	now = time(NULL);
-
-	init_events();
 	init_connections();
 	init_subnets();
 	init_nodes();
@@ -532,7 +573,7 @@ bool setup_network(void) {
   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;
@@ -553,6 +594,8 @@ void close_network_connections(void) {
 	}
 
 	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);
 	}
@@ -568,7 +611,6 @@ void close_network_connections(void) {
 	exit_subnets();
 	exit_nodes();
 	exit_connections();
-	exit_events();
 
 	execute_script("tinc-down", envp);