X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol_auth.c;h=59cab66f85aced6f7947344cfd258924891adac0;hp=88fba2665b995c9684d6dfc6c73beafbf34e83eb;hb=38c2d6c1dae3f09c68baa37fd24caa2e0ec6d8ad;hpb=e449d94caef963809d417f16497f6f978e10d731

diff --git a/src/protocol_auth.c b/src/protocol_auth.c
index 88fba266..59cab66f 100644
--- a/src/protocol_auth.c
+++ b/src/protocol_auth.c
@@ -1,7 +1,7 @@
 /*
     protocol_auth.c -- handle the meta-protocol, authentication
-    Copyright (C) 1999-2003 Ivo Timmermans <ivo@o2w.nl>,
-                  2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+    Copyright (C) 1999-2005 Ivo Timmermans,
+                  2000-2007 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
@@ -17,13 +17,14 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: protocol_auth.c,v 1.1.4.24 2003/07/17 15:06:26 guus Exp $
+    $Id$
 */
 
 #include "system.h"
 
 #include <openssl/sha.h>
 #include <openssl/rand.h>
+#include <openssl/err.h>
 #include <openssl/evp.h>
 
 #include "avl_tree.h"
@@ -39,7 +40,7 @@
 #include "utils.h"
 #include "xalloc.h"
 
-int send_id(connection_t *c)
+bool send_id(connection_t *c)
 {
 	cp();
 
@@ -47,44 +48,46 @@ int send_id(connection_t *c)
 						myself->connection->protocol_version);
 }
 
-int id_h(connection_t *c)
+bool id_h(connection_t *c)
 {
 	char name[MAX_STRING_SIZE];
-	int bla;
 
 	cp();
 
 	if(sscanf(c->buffer, "%*d " MAX_STRING " %d", name, &c->protocol_version) != 2) {
 		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ID", c->name,
 			   c->hostname);
-		return -1;
+		return false;
 	}
 
 	/* Check if identity is a valid name */
 
-	if(check_id(name)) {
+	if(!check_id(name)) {
 		logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ID", c->name,
 			   c->hostname, "invalid name");
-		return -1;
+		return false;
 	}
 
-	/* If we set c->name in advance, make sure we are connected to the right host */
+	/* If this is an outgoing connection, make sure we are connected to the right host */
 
-	if(c->name) {
+	if(c->outgoing) {
 		if(strcmp(c->name, name)) {
 			logger(LOG_ERR, _("Peer %s is %s instead of %s"), c->hostname, name,
 				   c->name);
-			return -1;
+			return false;
 		}
-	} else
+	} else {
+		if(c->name)
+			free(c->name);
 		c->name = xstrdup(name);
+	}
 
 	/* Check if version matches */
 
 	if(c->protocol_version != myself->connection->protocol_version) {
 		logger(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"),
 			   c->name, c->hostname, c->protocol_version);
-		return -1;
+		return false;
 	}
 
 	if(bypass_security) {
@@ -97,36 +100,27 @@ int id_h(connection_t *c)
 	if(!c->config_tree) {
 		init_configuration(&c->config_tree);
 
-		bla = read_connection_config(c);
-
-		if(bla) {
+		if(!read_connection_config(c)) {
 			logger(LOG_ERR, _("Peer %s had unknown identity (%s)"), c->hostname,
 				   c->name);
-			return -1;
+			return false;
 		}
 	}
 
-	if(read_rsa_public_key(c)) {
-		return -1;
+	if(!read_rsa_public_key(c)) {
+		return false;
 	}
 
-	/* Check some options */
-
-	if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &bla) && bla) || myself->options & OPTION_INDIRECT)
-		c->options |= OPTION_INDIRECT;
-
-	if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &bla) && bla) || myself->options & OPTION_TCPONLY)
-		c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
-
 	c->allow_request = METAKEY;
 
 	return send_metakey(c);
 }
 
-int send_metakey(connection_t *c)
+bool send_metakey(connection_t *c)
 {
-	char buffer[MAX_STRING_SIZE];
-	int len, x;
+	char *buffer;
+	int len;
+	bool x;
 
 	cp();
 
@@ -134,6 +128,8 @@ int send_metakey(connection_t *c)
 
 	/* Allocate buffers for the meta key */
 
+	buffer = alloca(2 * len + 1);
+	
 	if(!c->outkey)
 		c->outkey = xmalloc(len);
 
@@ -142,7 +138,7 @@ int send_metakey(connection_t *c)
 	cp();
 	/* Copy random data to the buffer */
 
-	RAND_bytes(c->outkey, len);
+	RAND_pseudo_bytes((unsigned char *)c->outkey, len);
 
 	/* The message we send must be smaller than the modulus of the RSA key.
 	   By definition, for a key of k bits, the following formula holds:
@@ -170,10 +166,10 @@ int send_metakey(connection_t *c)
 	   with a length equal to that of the modulus of the RSA key.
 	 */
 
-	if(RSA_public_encrypt(len, c->outkey, buffer, c->rsa_key, RSA_NO_PADDING) != len) {
+	if(RSA_public_encrypt(len, (unsigned char *)c->outkey, (unsigned char *)buffer, c->rsa_key, RSA_NO_PADDING) != len) {
 		logger(LOG_ERR, _("Error during encryption of meta key for %s (%s)"),
 			   c->name, c->hostname);
-		return -1;
+		return false;
 	}
 
 	/* Convert the encrypted random data to a hexadecimal formatted string */
@@ -191,18 +187,22 @@ int send_metakey(connection_t *c)
 	/* Further outgoing requests are encrypted with the key we just generated */
 
 	if(c->outcipher) {
-		EVP_EncryptInit(c->outctx, c->outcipher,
-						c->outkey + len - c->outcipher->key_len,
-						c->outkey + len - c->outcipher->key_len -
-						c->outcipher->iv_len);
+		if(!EVP_EncryptInit(c->outctx, c->outcipher,
+					(unsigned char *)c->outkey + len - c->outcipher->key_len,
+					(unsigned char *)c->outkey + len - c->outcipher->key_len -
+					c->outcipher->iv_len)) {
+			logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"),
+					c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+			return false;
+		}
 
-		c->status.encryptout = 1;
+		c->status.encryptout = true;
 	}
 
 	return x;
 }
 
-int metakey_h(connection_t *c)
+bool metakey_h(connection_t *c)
 {
 	char buffer[MAX_STRING_SIZE];
 	int cipher, digest, maclength, compression;
@@ -213,7 +213,7 @@ int metakey_h(connection_t *c)
 	if(sscanf(c->buffer, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, buffer) != 5) {
 		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name,
 			   c->hostname);
-		return -1;
+		return false;
 	}
 
 	len = RSA_size(myself->connection->rsa_key);
@@ -222,7 +222,7 @@ int metakey_h(connection_t *c)
 
 	if(strlen(buffer) != len * 2) {
 		logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength");
-		return -1;
+		return false;
 	}
 
 	/* Allocate buffers for the meta key */
@@ -239,10 +239,10 @@ int metakey_h(connection_t *c)
 
 	/* Decrypt the meta key */
 
-	if(RSA_private_decrypt(len, buffer, c->inkey, myself->connection->rsa_key, RSA_NO_PADDING) != len) {	/* See challenge() */
-		logger(LOG_ERR, _("Error during encryption of meta key for %s (%s)"),
+	if(RSA_private_decrypt(len, (unsigned char *)buffer, (unsigned char *)c->inkey, myself->connection->rsa_key, RSA_NO_PADDING) != len) {	/* See challenge() */
+		logger(LOG_ERR, _("Error during decryption of meta key for %s (%s)"),
 			   c->name, c->hostname);
-		return -1;
+		return false;
 	}
 
 	ifdebug(SCARY_THINGS) {
@@ -260,15 +260,19 @@ int metakey_h(connection_t *c)
 		
 		if(!c->incipher) {
 			logger(LOG_ERR, _("%s (%s) uses unknown cipher!"), c->name, c->hostname);
-			return -1;
+			return false;
 		}
 
-		EVP_DecryptInit(c->inctx, c->incipher,
-						c->inkey + len - c->incipher->key_len,
-						c->inkey + len - c->incipher->key_len -
-						c->incipher->iv_len);
+		if(!EVP_DecryptInit(c->inctx, c->incipher,
+					(unsigned char *)c->inkey + len - c->incipher->key_len,
+					(unsigned char *)c->inkey + len - c->incipher->key_len -
+					c->incipher->iv_len)) {
+			logger(LOG_ERR, _("Error during initialisation of cipher from %s (%s): %s"),
+					c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+			return false;
+		}
 
-		c->status.decryptin = 1;
+		c->status.decryptin = true;
 	} else {
 		c->incipher = NULL;
 	}
@@ -280,12 +284,12 @@ int metakey_h(connection_t *c)
 
 		if(!c->indigest) {
 			logger(LOG_ERR, _("Node %s (%s) uses unknown digest!"), c->name, c->hostname);
-			return -1;
+			return false;
 		}
 
 		if(c->inmaclength > c->indigest->md_size || c->inmaclength < 0) {
 			logger(LOG_ERR, _("%s (%s) uses bogus MAC length!"), c->name, c->hostname);
-			return -1;
+			return false;
 		}
 	} else {
 		c->indigest = NULL;
@@ -298,10 +302,10 @@ int metakey_h(connection_t *c)
 	return send_challenge(c);
 }
 
-int send_challenge(connection_t *c)
+bool send_challenge(connection_t *c)
 {
-	char buffer[MAX_STRING_SIZE];
-	int len, x;
+	char *buffer;
+	int len;
 
 	cp();
 
@@ -311,12 +315,14 @@ int send_challenge(connection_t *c)
 
 	/* Allocate buffers for the challenge */
 
+	buffer = alloca(2 * len + 1);
+
 	if(!c->hischallenge)
 		c->hischallenge = xmalloc(len);
 
 	/* Copy random data to the buffer */
 
-	RAND_bytes(c->hischallenge, len);
+	RAND_pseudo_bytes((unsigned char *)c->hischallenge, len);
 
 	/* Convert to hex */
 
@@ -325,12 +331,10 @@ int send_challenge(connection_t *c)
 
 	/* Send the challenge */
 
-	x = send_request(c, "%d %s", CHALLENGE, buffer);
-
-	return x;
+	return send_request(c, "%d %s", CHALLENGE, buffer);
 }
 
-int challenge_h(connection_t *c)
+bool challenge_h(connection_t *c)
 {
 	char buffer[MAX_STRING_SIZE];
 	int len;
@@ -340,7 +344,7 @@ int challenge_h(connection_t *c)
 	if(sscanf(c->buffer, "%*d " MAX_STRING, buffer) != 1) {
 		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name,
 			   c->hostname);
-		return -1;
+		return false;
 	}
 
 	len = RSA_size(myself->connection->rsa_key);
@@ -350,7 +354,7 @@ int challenge_h(connection_t *c)
 	if(strlen(buffer) != len * 2) {
 		logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
 			   c->hostname, "wrong challenge length");
-		return -1;
+		return false;
 	}
 
 	/* Allocate buffers for the challenge */
@@ -369,7 +373,7 @@ int challenge_h(connection_t *c)
 	return send_chal_reply(c);
 }
 
-int send_chal_reply(connection_t *c)
+bool send_chal_reply(connection_t *c)
 {
 	char hash[EVP_MAX_MD_SIZE * 2 + 1];
 	EVP_MD_CTX ctx;
@@ -378,10 +382,13 @@ int send_chal_reply(connection_t *c)
 
 	/* Calculate the hash from the challenge we received */
 
-	EVP_DigestInit(&ctx, c->indigest);
-	EVP_DigestUpdate(&ctx, c->mychallenge,
-					 RSA_size(myself->connection->rsa_key));
-	EVP_DigestFinal(&ctx, hash, NULL);
+	if(!EVP_DigestInit(&ctx, c->indigest)
+			|| !EVP_DigestUpdate(&ctx, c->mychallenge, RSA_size(myself->connection->rsa_key))
+			|| !EVP_DigestFinal(&ctx, (unsigned char *)hash, NULL)) {
+		logger(LOG_ERR, _("Error during calculation of response for %s (%s): %s"),
+			c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+		return false;
+	}
 
 	/* Convert the hash to a hexadecimal formatted string */
 
@@ -393,7 +400,7 @@ int send_chal_reply(connection_t *c)
 	return send_request(c, "%d %s", CHAL_REPLY, hash);
 }
 
-int chal_reply_h(connection_t *c)
+bool chal_reply_h(connection_t *c)
 {
 	char hishash[MAX_STRING_SIZE];
 	char myhash[EVP_MAX_MD_SIZE];
@@ -404,7 +411,7 @@ int chal_reply_h(connection_t *c)
 	if(sscanf(c->buffer, "%*d " MAX_STRING, hishash) != 1) {
 		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "CHAL_REPLY", c->name,
 			   c->hostname);
-		return -1;
+		return false;
 	}
 
 	/* Check if the length of the hash is all right */
@@ -412,7 +419,7 @@ int chal_reply_h(connection_t *c)
 	if(strlen(hishash) != c->outdigest->md_size * 2) {
 		logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
 			   c->hostname, _("wrong challenge reply length"));
-		return -1;
+		return false;
 	}
 
 	/* Convert the hash to binary format */
@@ -421,9 +428,13 @@ int chal_reply_h(connection_t *c)
 
 	/* Calculate the hash from the challenge we sent */
 
-	EVP_DigestInit(&ctx, c->outdigest);
-	EVP_DigestUpdate(&ctx, c->hischallenge, RSA_size(c->rsa_key));
-	EVP_DigestFinal(&ctx, myhash, NULL);
+	if(!EVP_DigestInit(&ctx, c->outdigest)
+			|| !EVP_DigestUpdate(&ctx, c->hischallenge, RSA_size(c->rsa_key))
+			|| !EVP_DigestFinal(&ctx, (unsigned char *)myhash, NULL)) {
+		logger(LOG_ERR, _("Error during calculation of response from %s (%s): %s"),
+			c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+		return false;
+	}
 
 	/* Verify the incoming hash with the calculated hash */
 
@@ -437,7 +448,7 @@ int chal_reply_h(connection_t *c)
 			logger(LOG_DEBUG, _("Expected challenge reply: %s"), hishash);
 		}
 
-		return -1;
+		return false;
 	}
 
 	/* Identity has now been positively verified.
@@ -449,26 +460,35 @@ int chal_reply_h(connection_t *c)
 	return send_ack(c);
 }
 
-int send_ack(connection_t *c)
+bool send_ack(connection_t *c)
 {
 	/* ACK message contains rest of the information the other end needs
 	   to create node_t and edge_t structures. */
 
-	int x;
 	struct timeval now;
+	bool choice;
 
 	cp();
 
 	/* Estimate weight */
 
 	gettimeofday(&now, NULL);
-	c->estimated_weight =
-		(now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec -
-												 c->start.tv_usec) / 1000;
-	x = send_request(c, "%d %s %d %lx", ACK, myport, c->estimated_weight,
-					 c->options);
+	c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000;
 
-	return x;
+	/* Check some options */
+
+	if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &choice) && choice) || myself->options & OPTION_INDIRECT)
+		c->options |= OPTION_INDIRECT;
+
+	if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &choice) && choice) || myself->options & OPTION_TCPONLY)
+		c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
+
+	if((get_config_bool(lookup_config(c->config_tree, "PMTUDiscovery"), &choice) && choice) || myself->options & OPTION_PMTU_DISCOVERY)
+		c->options |= OPTION_PMTU_DISCOVERY;
+
+	get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight);
+
+	return send_request(c, "%d %s %d %lx", ACK, myport, c->estimated_weight, c->options);
 }
 
 static void send_everything(connection_t *c)
@@ -480,26 +500,35 @@ static void send_everything(connection_t *c)
 
 	/* Send all known subnets and edges */
 
+	if(tunnelserver) {
+		for(node = myself->subnet_tree->head; node; node = node->next) {
+			s = node->data;
+			send_add_subnet(c, s);
+		}
+
+		return;
+	}
+
 	for(node = node_tree->head; node; node = node->next) {
-		n = (node_t *) node->data;
+		n = node->data;
 
 		for(node2 = n->subnet_tree->head; node2; node2 = node2->next) {
-			s = (subnet_t *) node2->data;
+			s = node2->data;
 			send_add_subnet(c, s);
 		}
 
 		for(node2 = n->edge_tree->head; node2; node2 = node2->next) {
-			e = (edge_t *) node2->data;
+			e = node2->data;
 			send_add_edge(c, e);
 		}
 	}
 }
 
-int ack_h(connection_t *c)
+bool ack_h(connection_t *c)
 {
 	char hisport[MAX_STRING_SIZE];
 	char *hisaddress, *dummy;
-	int weight;
+	int weight, mtu;
 	long int options;
 	node_t *n;
 
@@ -508,7 +537,7 @@ int ack_h(connection_t *c)
 	if(sscanf(c->buffer, "%*d " MAX_STRING " %d %lx", hisport, &weight, &options) != 3) {
 		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ACK", c->name,
 			   c->hostname);
-		return -1;
+		return false;
 	}
 
 	/* Check if we already have a node_t for him */
@@ -524,7 +553,7 @@ int ack_h(connection_t *c)
 			/* Oh dear, we already have a connection to this node. */
 			ifdebug(CONNECTIONS) logger(LOG_DEBUG, _("Established a second connection with %s (%s), closing old connection"),
 					   n->name, n->hostname);
-			terminate_connection(n->connection, 0);
+			terminate_connection(n->connection, false);
 			/* Run graph algorithm to purge key and make sure up/down scripts are rerun with new IP addresses and stuff */
 			graph();
 		}
@@ -534,10 +563,16 @@ int ack_h(connection_t *c)
 	c->node = n;
 	c->options |= options;
 
+	if(get_config_int(lookup_config(c->config_tree, "PMTU"), &mtu) && mtu < n->mtu)
+		n->mtu = mtu;
+
+	if(get_config_int(lookup_config(myself->connection->config_tree, "PMTU"), &mtu) && mtu < n->mtu)
+		n->mtu = mtu;
+
 	/* Activate this connection */
 
 	c->allow_request = ALL;
-	c->status.active = 1;
+	c->status.active = true;
 
 	ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection with %s (%s) activated"), c->name,
 			   c->hostname);
@@ -564,11 +599,14 @@ int ack_h(connection_t *c)
 
 	/* Notify everyone of the new edge */
 
-	send_add_edge(broadcast, c->edge);
+	if(tunnelserver)
+		send_add_edge(c, c->edge);
+	else
+		send_add_edge(broadcast, c->edge);
 
 	/* Run MST and SSSP algorithms */
 
 	graph();
 
-	return 0;
+	return true;
 }