X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol_key.c;h=5baa5f409b1fcaf0a7c7b197d62da60f9259636a;hp=0f14cd69c53251d0d6e02e3e2fce9b94240eb78e;hb=3308d13e7e3bf20cfeaf6f2ab17228a9820cea66;hpb=4a7c2026aec6966f934b60d75bc472d28f8587d8

diff --git a/src/protocol_key.c b/src/protocol_key.c
index 0f14cd69..5baa5f40 100644
--- a/src/protocol_key.c
+++ b/src/protocol_key.c
@@ -1,7 +1,7 @@
 /*
     protocol_key.c -- handle the meta-protocol, key exchange
-    Copyright (C) 1999-2002 Ivo Timmermans <ivo@o2w.nl>,
-                  2000-2002 Guus Sliepen <guus@sliepen.eu.org>
+    Copyright (C) 1999-2005 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
@@ -17,262 +17,284 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: protocol_key.c,v 1.1.4.9 2002/09/04 08:02:33 guus Exp $
+    $Id$
 */
 
-#include "config.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <errno.h>
+#include "system.h"
 
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
 
-#include "conf.h"
+#include "avl_tree.h"
+#include "connection.h"
+#include "logger.h"
 #include "net.h"
 #include "netutl.h"
-#include "protocol.h"
-#include "meta.h"
-#include "connection.h"
 #include "node.h"
+#include "protocol.h"
+#include "utils.h"
+#include "xalloc.h"
 
-#include "system.h"
-
-int mykeyused = 0;
+bool mykeyused = false;
 
-int send_key_changed(connection_t *c, node_t *n)
+bool send_key_changed()
 {
-cp
-  /* Only send this message if some other daemon requested our key previously.
-     This reduces unnecessary key_changed broadcasts.
-  */
+	cp();
+
+	/* Only send this message if some other daemon requested our key previously.
+	   This reduces unnecessary key_changed broadcasts.
+	 */
 
-  if(n == myself && !mykeyused)
-    return 0;
+	if(!mykeyused)
+		return true;
 
-  send_request(NULL, "%d %lx %s", KEY_CHANGED, random(), n->name);
-cp
-  return 0;
+	return send_request(broadcast, "%d %lx %s", KEY_CHANGED, random(), myself->name);
 }
 
-int key_changed_h(connection_t *c)
+bool key_changed_h(connection_t *c)
 {
-  char name[MAX_STRING_SIZE];
-  avl_node_t *node;
-  connection_t *other;
-  node_t *n;
-cp
-  if(sscanf(c->buffer, "%*d %*x "MAX_STRING, name) != 1)
-    {
-      syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
-             c->name, c->hostname);
-      return -1;
-    }
-
-  if(seen_request(c->buffer))
-    return 0;
-
-  n = lookup_node(name);
-
-  if(!n)
-    {
-      syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED",
-             c->name, c->hostname, name);
-      return -1;
-    }
-
-  n->status.validkey = 0;
-  n->status.waitingforkey = 0;
-
-  /* Tell the others */
-
-  for(node = connection_tree->head; node; node = node->next)
-    {
-      other = (connection_t *)node->data;
-      if(other->status.active && other != c)
-        send_request(other, "%s", c->buffer);
-    }
-cp
-  return 0;
+	char name[MAX_STRING_SIZE];
+	node_t *n;
+
+	cp();
+
+	if(sscanf(c->buffer, "%*d %*x " MAX_STRING, name) != 1) {
+		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED",
+			   c->name, c->hostname);
+		return false;
+	}
+
+	if(seen_request(c->buffer))
+		return true;
+
+	n = lookup_node(name);
+
+	if(!n) {
+		logger(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"),
+			   "KEY_CHANGED", c->name, c->hostname, name);
+		return false;
+	}
+
+	n->status.validkey = false;
+	n->status.waitingforkey = false;
+
+	/* Tell the others */
+
+	if(!tunnelserver)
+		forward_request(c);
+
+	return true;
 }
 
-int send_req_key(connection_t *c, node_t *from, node_t *to)
+bool send_req_key(node_t *to)
 {
-cp
-  return send_request(c, "%d %s %s", REQ_KEY,
-                      from->name, to->name);
+	cp();
+
+	return send_request(to->nexthop->connection, "%d %s %s", REQ_KEY, myself->name, to->name);
 }
 
-int req_key_h(connection_t *c)
+bool req_key_h(connection_t *c)
 {
-  char from_name[MAX_STRING_SIZE];
-  char to_name[MAX_STRING_SIZE];
-  node_t *from, *to;
-cp
-  if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2)
-    {
-       syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY",
-              c->name, c->hostname);
-       return -1;
-    }
-
-  from = lookup_node(from_name);
-
-  if(!from)
-    {
-      syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "REQ_KEY",
-             c->name, c->hostname, from_name);
-      return -1;
-    }
-
-  to = lookup_node(to_name);
-  
-  if(!to)
-    {
-      syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "REQ_KEY",
-             c->name, c->hostname, to_name);
-      return -1;
-    }
-
-  /* Check if this key request is for us */
-
-  if(to == myself)	/* Yes, send our own key back */
-    {
-      mykeyused = 1;
-      from->sent_seqno = 0;
-      send_ans_key(c, myself, from);
-    }
-  else
-    {
-/* Proxy keys
-      if(to->status.validkey)
-        {
-          send_ans_key(c, to, from);
-        }
-      else
-*/
-        send_req_key(to->nexthop->connection, from, to);
-    }
+	char from_name[MAX_STRING_SIZE];
+	char to_name[MAX_STRING_SIZE];
+	node_t *from, *to;
+
+	cp();
+
+	if(sscanf(c->buffer, "%*d " MAX_STRING " " MAX_STRING, from_name, to_name) != 2) {
+		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY", c->name,
+			   c->hostname);
+		return false;
+	}
+
+	from = lookup_node(from_name);
+
+	if(!from) {
+		logger(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"),
+			   "REQ_KEY", c->name, c->hostname, from_name);
+		return false;
+	}
+
+	to = lookup_node(to_name);
+
+	if(!to) {
+		logger(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"),
+			   "REQ_KEY", c->name, c->hostname, to_name);
+		return false;
+	}
+
+	/* Check if this key request is for us */
+
+	if(to == myself) {			/* Yes, send our own key back */
+		mykeyused = true;
+		from->received_seqno = 0;
+		memset(from->late, 0, sizeof(from->late));
+		send_ans_key(from);
+	} else {
+		if(tunnelserver)
+			return false;
+
+		if(!to->status.reachable) {
+			logger(LOG_WARNING, _("Got %s from %s (%s) destination %s which is not reachable"),
+				"REQ_KEY", c->name, c->hostname, to_name);
+			return true;
+		}
+
+		send_request(to->nexthop->connection, "%s", c->buffer);
+	}
 
-cp
-  return 0;
+	return true;
 }
 
-int send_ans_key(connection_t *c, node_t *from, node_t *to)
+bool send_ans_key(node_t *to)
 {
-  char key[MAX_STRING_SIZE];
-cp
-  bin2hex(from->key, key, from->keylength);
-  key[from->keylength * 2] = '\0';
-cp
-  return send_request(c, "%d %s %s %s %d %d %d %d", ANS_KEY,
-                      from->name, to->name, key, from->cipher?from->cipher->nid:0, from->digest?from->digest->type:0, from->maclength, from->compression);
+	char *key;
+
+	cp();
+
+	if(!to->inkey) {
+		to->incipher = myself->incipher;
+		to->inkeylength = myself->inkeylength;
+		to->indigest = myself->indigest;
+		to->incompression = myself->incompression;
+		to->inkey = xmalloc(to->inkeylength);
+
+		RAND_pseudo_bytes((unsigned char *)to->inkey, to->inkeylength);
+		if(to->incipher)
+			EVP_DecryptInit_ex(&packet_ctx, to->incipher, NULL, (unsigned char *)to->inkey, (unsigned char *)to->inkey + to->incipher->key_len);
+	}
+
+	key = alloca(2 * to->inkeylength + 1);
+	bin2hex(to->inkey, key, to->inkeylength);
+	key[to->outkeylength * 2] = '\0';
+
+	return send_request(to->nexthop->connection, "%d %s %s %s %d %d %d %d", ANS_KEY,
+			myself->name, to->name, key,
+			to->incipher ? to->incipher->nid : 0,
+			to->indigest ? to->indigest->type : 0, to->inmaclength,
+			to->incompression);
 }
 
-int ans_key_h(connection_t *c)
+bool ans_key_h(connection_t *c)
 {
-  char from_name[MAX_STRING_SIZE];
-  char to_name[MAX_STRING_SIZE];
-  char key[MAX_STRING_SIZE];
-  int cipher, digest, maclength, compression;
-  node_t *from, *to;
-cp
-  if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d", from_name, to_name, key, &cipher, &digest, &maclength, &compression) != 7)
-    {
-       syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY",
-              c->name, c->hostname);
-       return -1;
-    }
-
-  from = lookup_node(from_name);
-
-  if(!from)
-    {
-      syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "ANS_KEY",
-             c->name, c->hostname, from_name);
-      return -1;
-    }
-
-  to = lookup_node(to_name);
-
-  if(!to)
-    {
-      syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "ANS_KEY",
-             c->name, c->hostname, to_name);
-      return -1;
-    }
-
-  /* Forward it if necessary */
-
-  if(to != myself)
-    {
-      return send_request(to->nexthop->connection, "%s", c->buffer);
-    }
-
-  /* Update our copy of the origin's packet key */
-
-  if(from->key)
-    free(from->key);
-
-  from->key = xstrdup(key);
-  from->keylength = strlen(key) / 2;
-  hex2bin(from->key, from->key, from->keylength);
-  from->key[from->keylength] = '\0';
-
-  from->status.validkey = 1;
-  from->status.waitingforkey = 0;
-  from->received_seqno = 0;
-    
-  /* Check and lookup cipher and digest algorithms */
-
-  if(cipher)
-    {
-      from->cipher = EVP_get_cipherbynid(cipher);
-      if(!from->cipher)
-	{
-	  syslog(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name, from->hostname);
-	  return -1;
+	char from_name[MAX_STRING_SIZE];
+	char to_name[MAX_STRING_SIZE];
+	char key[MAX_STRING_SIZE];
+	int cipher, digest, maclength, compression;
+	node_t *from, *to;
+
+	cp();
+
+	if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %d %d %d",
+		from_name, to_name, key, &cipher, &digest, &maclength,
+		&compression) != 7) {
+		logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY", c->name,
+			   c->hostname);
+		return false;
+	}
+
+	from = lookup_node(from_name);
+
+	if(!from) {
+		logger(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"),
+			   "ANS_KEY", c->name, c->hostname, from_name);
+		return false;
 	}
-      if(from->keylength != from->cipher->key_len + from->cipher->iv_len)
-	{
-	  syslog(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name, from->hostname);
-	  return -1;
-        }
-    }
-  else
-    {
-      from->cipher = NULL;
-    }
-
-  from->maclength = maclength;
-
-  if(digest)
-    {
-      from->digest = EVP_get_digestbynid(digest);
-      if(!from->digest)
-	{
-	  syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name, from->hostname);
-	  return -1;
+
+	to = lookup_node(to_name);
+
+	if(!to) {
+		logger(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"),
+			   "ANS_KEY", c->name, c->hostname, to_name);
+		return false;
 	}
-      if(from->maclength > from->digest->md_size || from->maclength < 0)
-	{
-	  syslog(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"), from->name, from->hostname);
-	  return -1;
+
+	/* Forward it if necessary */
+
+	if(to != myself) {
+		if(tunnelserver)
+			return false;
+
+		if(!to->status.reachable) {
+			logger(LOG_WARNING, _("Got %s from %s (%s) destination %s which is not reachable"),
+				"ANS_KEY", c->name, c->hostname, to_name);
+			return true;
+		}
+
+		return send_request(to->nexthop->connection, "%s", c->buffer);
 	}
-    }
-  else
-    {
-      from->digest = NULL;
-    }
-
-  from->compression = compression;
-  
-  flush_queue(from);
-cp
-  return 0;
+
+	/* Update our copy of the origin's packet key */
+
+	if(from->outkey)
+		free(from->outkey);
+
+	from->outkey = xstrdup(key);
+	from->outkeylength = strlen(key) / 2;
+	hex2bin(from->outkey, from->outkey, from->outkeylength);
+	from->outkey[from->outkeylength] = '\0';
+
+	from->status.validkey = true;
+	from->status.waitingforkey = false;
+	from->sent_seqno = 0;
+
+	/* Check and lookup cipher and digest algorithms */
+
+	if(cipher) {
+		from->outcipher = EVP_get_cipherbynid(cipher);
+
+		if(!from->outcipher) {
+			logger(LOG_ERR, _("Node %s (%s) uses unknown cipher!"), from->name,
+				   from->hostname);
+			return false;
+		}
+
+		if(from->outkeylength != from->outcipher->key_len + from->outcipher->iv_len) {
+			logger(LOG_ERR, _("Node %s (%s) uses wrong keylength!"), from->name,
+				   from->hostname);
+			return false;
+		}
+	} else {
+		from->outcipher = NULL;
+	}
+
+	from->outmaclength = maclength;
+
+	if(digest) {
+		from->outdigest = EVP_get_digestbynid(digest);
+
+		if(!from->outdigest) {
+			logger(LOG_ERR, _("Node %s (%s) uses unknown digest!"), from->name,
+				   from->hostname);
+			return false;
+		}
+
+		if(from->outmaclength > from->outdigest->md_size || from->outmaclength < 0) {
+			logger(LOG_ERR, _("Node %s (%s) uses bogus MAC length!"),
+				   from->name, from->hostname);
+			return false;
+		}
+	} else {
+		from->outdigest = NULL;
+	}
+
+	if(compression < 0 || compression > 11) {
+		logger(LOG_ERR, _("Node %s (%s) uses bogus compression level!"), from->name, from->hostname);
+		return false;
+	}
+	
+	from->outcompression = compression;
+
+	if(from->outcipher)
+		if(!EVP_EncryptInit_ex(&from->outctx, from->outcipher, NULL, (unsigned char *)from->outkey, (unsigned char *)from->outkey + from->outcipher->key_len)) {
+			logger(LOG_ERR, _("Error during initialisation of key from %s (%s): %s"),
+					from->name, from->hostname, ERR_error_string(ERR_get_error(), NULL));
+			return false;
+		}
+
+	if(from->options & OPTION_PMTU_DISCOVERY && !from->mtuprobes)
+		send_mtu_probe(from);
+
+	return true;
 }