X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet_setup.c;h=17eaec2b7475be8ec88b5ccae689cdecec68de6b;hb=5a132550deb58473285e5f91705d286aef47be71;hp=e101d9de0c7d9ac1c1e9418cec730f952e7b4aaf;hpb=4aadb9500d9198f9c271deb048a2d36000bfae34;p=tinc

diff --git a/src/net_setup.c b/src/net_setup.c
index e101d9de..17eaec2b 100644
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -1,7 +1,7 @@
 /*
     net_setup.c -- Setup.
-    Copyright (C) 1998-2003 Ivo Timmermans <ivo@o2w.nl>,
-                  2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+    Copyright (C) 1998-2005 Ivo Timmermans,
+                  2000-2009 Guus Sliepen <guus@tinc-vpn.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
@@ -17,20 +17,18 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: net_setup.c,v 1.1.2.38 2003/07/22 21:13:23 guus Exp $
+    $Id$
 */
 
 #include "system.h"
 
-#include <openssl/pem.h>
-#include <openssl/rsa.h>
-#include <openssl/rand.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"
@@ -38,171 +36,139 @@
 #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)
-{
+bool read_rsa_public_key(connection_t *c) {
 	FILE *fp;
 	char *fname;
-	char *key;
+	char *n;
+	bool result;
 
 	cp();
 
-	if(!c->rsa_key) {
-		c->rsa_key = RSA_new();
-//		RSA_blinding_on(c->rsa_key, NULL);
-	}
-
 	/* 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))
+		asprintf(&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 */
-
-	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);
-	}
+	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);
+	return result;
+}
 
-	if(c->rsa_key)
-		return true;
+bool read_rsa_private_key() {
+	FILE *fp;
+	char *fname;
+	char *n, *d;
+	bool result;
 
-	/* Try again with PEM_read_RSA_PUBKEY. */
+	cp();
 
-	asprintf(&fname, "%s/hosts/%s", confbase, c->name);
-	fp = fopen(fname, "r");
+	/* First, check for simple PrivateKey statement */
 
-	if(fp) {
-		c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
-//		RSA_blinding_on(c->rsa_key, NULL);
-		fclose(fp);
+	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;
+		}
+		result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d);
+		free(n);
+		free(d);
+		return true;
 	}
 
-	free(fname);
-
-	if(c->rsa_key)
-		return true;
+	/* Else, check for PrivateKeyFile statement and read it */
 
-	logger(LOG_ERR, _("No public key for %s specified!"), c->name);
+	if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
+		asprintf(&fname, "%s/rsa_key.priv", confbase);
 
-	return false;
-}
+	fp = fopen(fname, "r");
 
-bool read_rsa_private_key(void)
-{
-	FILE *fp;
-	char *fname, *key;
+	if(!fp) {
+		logger(LOG_ERR, _("Error reading RSA private key file `%s': %s"),
+			   fname, strerror(errno));
+		free(fname);
+		return false;
+	}
 
-	cp();
+#if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN)
+	struct stat s;
 
-	if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
-		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->e, "FFFF");
-		free(key);
-		return true;
+	if(fstat(fileno(fp), &s)) {
+		logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"), fname, strerror(errno));
+		free(fname);
+		return false;
 	}
 
-	if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
-		asprintf(&fname, "%s/rsa_key.priv", confbase);
+	if(s.st_mode & ~0100700)
+		logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname);
+#endif
 
-	if(is_safe_path(fname)) {
-		fp = fopen(fname, "r");
+	result = rsa_read_pem_private_key(&myself->connection->rsa, fp);
+	fclose(fp);
 
-		if(!fp) {
-			logger(LOG_ERR, _("Error reading RSA private key file `%s': %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;
+}
 
-		free(fname);
-		myself->connection->rsa_key =
-			PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
-		fclose(fp);
+static struct event keyexpire_event;
 
-		if(!myself->connection->rsa_key) {
-			logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"),
-				   fname, strerror(errno));
-			return false;
-		}
+static void keyexpire_handler(int fd, short events, void *data) {
+	regenerate_key();
+}
 
-		return true;
+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 false;
+	event_add(&keyexpire_event, &(struct timeval){keylifetime, 0});
 }
 
 /*
   Configure node_t myself and set up the local sockets (listen only)
 */
-bool setup_myself(void)
-{
+bool setup_myself(void) {
 	config_t *cfg;
 	subnet_t *subnet;
 	char *name, *hostname, *mode, *afname, *cipher, *digest;
 	char *address = NULL;
 	char *envp[5];
-	struct addrinfo hint, *ai, *aip;
+	struct addrinfo *ai, *aip, hint = {0};
 	bool choice;
 	int i, err;
 
@@ -232,19 +198,15 @@ bool setup_myself(void)
 	myself->name = name;
 	myself->connection->name = xstrdup(name);
 
-	if(!read_rsa_private_key())
-		return false;
-
 	if(!read_connection_config(myself->connection)) {
 		logger(LOG_ERR, _("Cannot open host configuration file for myself!"));
 		return false;
 	}
 
-	if(!read_rsa_public_key(myself->connection))
+	if(!read_rsa_private_key())
 		return false;
 
-	if(!get_config_string
-	   (lookup_config(myself->connection->config_tree, "Port"), &myport))
+	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 */
@@ -262,25 +224,23 @@ bool setup_myself(void)
 
 	/* 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, "IndirectData"), &choice) && 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(config_tree, "TCPOnly"), &choice) && 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, "IndirectData"), &choice) && choice)
+		myself->options |= OPTION_INDIRECT;
 
-	if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
-		if(choice)
-			myself->options |= OPTION_TCPONLY;
+	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;
 
+	get_config_bool(lookup_config(config_tree, "TunnelServer"), &tunnelserver);
+
 	if(get_config_string(lookup_config(config_tree, "Mode"), &mode)) {
 		if(!strcasecmp(mode, "router"))
 			routing_mode = RMODE_ROUTER;
@@ -296,17 +256,21 @@ bool setup_myself(void)
 	} else
 		routing_mode = RMODE_ROUTER;
 
+	if(routing_mode == RMODE_ROUTER)
+		if(!get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) || choice)
+			myself->options |= OPTION_PMTU_DISCOVERY;
+
 	get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance);
 
 #if !defined(SOL_IP) || !defined(IP_TOS)
 	if(priorityinheritance)
-		logger(LOG_WARNING, _("PriorityInheritance not supported on this platform"));
+		logger(LOG_WARNING, _("%s not supported on this platform"), "PriorityInheritance");
 #endif
 
 	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(get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout)) {
 		if(maxtimeout <= 0) {
 			logger(LOG_ERR, _("Bogus maximum timeout!"));
 			return false;
@@ -332,84 +296,50 @@ 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->cipher = NULL;
-		} else {
-			myself->cipher = EVP_get_cipherbyname(cipher);
-
-			if(!myself->cipher) {
-				logger(LOG_ERR, _("Unrecognized cipher type!"));
-				return false;
-			}
-		}
-	} else
-		myself->cipher = EVP_bf_cbc();
-
-	if(myself->cipher)
-		myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
-	else
-		myself->keylength = 1;
+	if(!get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher))
+		cipher = xstrdup("blowfish");
 
-	myself->connection->outcipher = EVP_bf_ofb();
-
-	myself->key = (char *) xmalloc(myself->keylength);
-	RAND_pseudo_bytes(myself->key, myself->keylength);
+	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;
-	
-	EVP_CIPHER_CTX_init(&packet_ctx);
-	EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len);
+	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->digest = NULL;
-		} else {
-			myself->digest = EVP_get_digestbyname(digest);
-
-			if(!myself->digest) {
-				logger(LOG_ERR, _("Unrecognized digest type!"));
-				return false;
-			}
-		}
-	} 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) {
-				logger(LOG_ERR, _("MAC length exceeds size of digest!"));
-				return false;
-			} else if(myself->maclength < 0) {
-				logger(LOG_ERR, _("Bogus MAC length!"));
-				return false;
-			}
-		}
-	} else
-		myself->maclength = 4;
+	if(!get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest))
+		digest = xstrdup("sha1");
+
+	if(!digest_open_by_name(&myself->indigest, digest)) {
+		logger(LOG_ERR, _("Unrecognized digest type!"));
+		return false;
+	}
 
-	myself->connection->outmaclength = 0;
+	if(!get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->inmaclength))
+
+	if(digest_active(&myself->indigest)) {
+		if(myself->inmaclength > digest_length(&myself->indigest)) {
+			logger(LOG_ERR, _("MAC length exceeds size of digest!"));
+			return false;
+		} else if(myself->inmaclength < 0) {
+			logger(LOG_ERR, _("Bogus MAC length!"));
+			return false;
+		}
+	}
 
 	/* Compression */
 
-	if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"),
-		&myself->compression)) {
-		if(myself->compression < 0 || myself->compression > 11) {
+	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!"));
 			return false;
 		}
 	} else
-		myself->compression = 0;
+		myself->incompression = 0;
 
 	myself->connection->outcompression = 0;
 
@@ -417,7 +347,6 @@ bool setup_myself(void)
 
 	myself->nexthop = myself;
 	myself->via = myself;
-	myself->status.active = true;
 	myself->status.reachable = true;
 	node_add(myself);
 
@@ -428,6 +357,14 @@ bool setup_myself(void)
 	if(!setup_device())
 		return false;
 
+	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 */
 	asprintf(&envp[0], "NETNAME=%s", netname ? : "");
 	asprintf(&envp[1], "DEVICE=%s", device ? : "");
@@ -440,9 +377,11 @@ bool setup_myself(void)
 	for(i = 0; i < 5; i++)
 		free(envp[i]);
 
-	/* Open sockets */
+	/* Run subnet-up scripts for our own subnets */
+
+	subnet_update(myself, NULL, true);
 
-	memset(&hint, 0, sizeof(hint));
+	/* Open sockets */
 
 	get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
 
@@ -471,8 +410,28 @@ 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);
@@ -480,8 +439,13 @@ bool setup_myself(void)
 			free(hostname);
 		}
 
-		listen_socket[listen_sockets].sa.sa = *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);
@@ -497,42 +461,44 @@ bool setup_myself(void)
 }
 
 /*
-  setup all initial network connections
+  initialize network
 */
-bool setup_network_connections(void)
+bool setup_network(void)
 {
 	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;
+	if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) {
+		if(pinginterval < 1) {
+			pinginterval = 86400;
 		}
 	} else
-		pingtimeout = 60;
+		pinginterval = 60;
+
+	if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout))
+		pingtimeout = 5;
+	if(pingtimeout < 1 || pingtimeout > pinginterval)
+		pingtimeout = pinginterval;
+
+	if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize))
+		maxoutbufsize = 10 * MTU;
 
 	if(!setup_myself())
 		return false;
 
-	try_outgoing_connections();
-
 	return true;
 }
 
 /*
   close all open network connections
 */
-void close_network_connections(void)
-{
-	avl_node_t *node, *next;
+void close_network_connections(void) {
+	splay_node_t *node, *next;
 	connection_t *c;
 	char *envp[5];
 	int i;
@@ -541,36 +507,42 @@ void close_network_connections(void)
 
 	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;
+		c = node->data;
+		c->outgoing = false;
 		terminate_connection(c, false);
 	}
 
-	if(myself && myself->connection)
+	list_delete_list(outgoing_list);
+
+	if(myself && myself->connection) {
+		subnet_update(myself, NULL, false);
 		terminate_connection(myself->connection, false);
+		free_connection(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_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", iface ? : "");
 	asprintf(&envp[3], "NAME=%s", myself->name);
 	envp[4] = NULL;
 
+	exit_requests();
+	exit_edges();
+	exit_subnets();
+	exit_nodes();
+	exit_connections();
+
 	execute_script("tinc-down", envp);
 
+	if(myport) free(myport);
+
 	for(i = 0; i < 4; i++)
 		free(envp[i]);