X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=de932512fede3cf3473e98f82722d1df97a709d2;hp=cd63ad0b094ac5b684d57c4e01a03defd3be8c51;hb=ba918dce287788aaf6a90b3c7a9f349b197068d6;hpb=e4f3d93ec62871d1ae11b460627aef0da1b23cd2

diff --git a/src/protocol.c b/src/protocol.c
index cd63ad0b..de932512 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: protocol.c,v 1.28.4.87 2001/05/07 19:08:46 guus Exp $
+    $Id: protocol.c,v 1.28.4.93 2001/06/08 18:02:10 guus Exp $
 */
 
 #include "config.h"
@@ -68,6 +68,8 @@
 
 #include "system.h"
 
+int mykeyused = 0;
+
 int check_id(char *id)
 {
   int i;
@@ -104,11 +106,15 @@ cp
       return -1;
     }
 
-  len++;
-
   if(debug_lvl >= DEBUG_PROTOCOL)
-    syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
+    {
+      if(debug_lvl >= DEBUG_META)
+        syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], cl->name, cl->hostname, buffer);
+      else
+        syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
+    }
 
+  buffer[len++] = '\n';
 cp
   return send_meta(cl, buffer, len);
 }
@@ -116,20 +122,31 @@ cp
 int receive_request(connection_t *cl)
 {
   int request;
-cp  
+cp
   if(sscanf(cl->buffer, "%d", &request) == 1)
     {
       if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
         {
-          syslog(LOG_ERR, _("Unknown request from %s (%s)"),
-		 cl->name, cl->hostname);
+          if(debug_lvl >= DEBUG_META)
+            syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
+	           cl->name, cl->hostname, cl->buffer);
+          else
+            syslog(LOG_ERR, _("Unknown request from %s (%s)"),
+                   cl->name, cl->hostname);
+                   
           return -1;
         }
       else
         {
           if(debug_lvl >= DEBUG_PROTOCOL)
-            syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
-		   request_name[request], cl->name, cl->hostname);
+            {
+              if(debug_lvl >= DEBUG_META)
+                syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"),
+	               request_name[request], cl->name, cl->hostname, cl->buffer);
+              else
+                syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
+		       request_name[request], cl->name, cl->hostname);
+            }
 	}
 
       if((cl->allow_request != ALL) && (cl->allow_request != request))
@@ -156,34 +173,8 @@ cp
   return 0;
 }
 
-/* Connection protocol:
-
-   Client               Server
-   send_id(u)
-                        send_challenge(R)
-   send_chal_reply(H)
-                        send_id(u)
-   send_challenge(R)
-                        send_chal_reply(H)
-   ---------------------------------------
-   send_metakey(R)
-                        send_metakey(R)
-   ---------------------------------------
-   send_ack(u)
-                        send_ack(u)
-   ---------------------------------------
-   Other requests(E)...
-
-   (u) Unencrypted,
-   (R) RSA,
-   (H) SHA1,
-   (E) Encrypted with symmetric cipher.
-
-   Part of the challenge is directly used to set the symmetric cipher
-   key and the initial vector.  Since a man-in-the-middle cannot
-   decrypt the RSA challenges, this means that he cannot get or forge
-   the key for the symmetric cipher.
-*/
+/* The authentication protocol is described in detail in doc/SECURITY2,
+   the rest will be described in doc/PROTOCOL. */
 
 int send_id(connection_t *cl)
 {
@@ -223,6 +214,9 @@ cp
   
   /* Copy string to cl */
   
+  if(cl->name)
+    free(cl->name);
+    
   cl->name = xstrdup(name);
 
   /* Load information about peer */
@@ -303,6 +297,8 @@ cp
   if(debug_lvl >= DEBUG_CONNECTIONS)
     syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
 
+  if(cl->status.outgoing)
+    seconds_till_retry = 5;	/* Reset retry timeout */
 cp
   /* Check some options */
   
@@ -1060,11 +1056,15 @@ cp
 
 int send_ping(connection_t *cl)
 {
+  char salt[SALTLEN*2+1];
 cp
   cl->status.pinged = 1;
   cl->last_ping_time = time(NULL);
+  RAND_bytes(salt, SALTLEN);
+  bin2hex(salt, salt, SALTLEN);
+  salt[SALTLEN*2] = '\0';
 cp
-  return send_request(cl, "%d", PING);
+  return send_request(cl, "%d %s", PING, salt);
 }
 
 int ping_h(connection_t *cl)
@@ -1075,8 +1075,13 @@ cp
 
 int send_pong(connection_t *cl)
 {
+  char salt[SALTLEN*2+1];
 cp
-  return send_request(cl, "%d", PONG);
+  RAND_bytes(salt, SALTLEN);
+  bin2hex(salt, salt, SALTLEN);
+  salt[SALTLEN*2] = '\0';
+cp
+  return send_request(cl, "%d %s", PONG, salt);
 }
 
 int pong_h(connection_t *cl)
@@ -1094,13 +1099,21 @@ int send_key_changed(connection_t *from, connection_t *cl)
   connection_t *p;
   avl_node_t *node;
 cp
-  for(node = connection_tree->head; node; node = node->next)
+  /* Only send this message if some other daemon requested our key previously.
+     This reduces unnecessary key_changed broadcasts.
+  */
+
+  if(mykeyused)
     {
-      p = (connection_t *)node->data;
-      if(p != cl && p->status.meta && p->status.active)
-        if(!(p->options & OPTION_INDIRECT) || from == myself)
-          send_request(p, "%d %s", KEY_CHANGED, from->name);
-    }
+      for(node = connection_tree->head; node; node = node->next)
+        {
+          p = (connection_t *)node->data;
+          if(p != cl && p->status.meta && p->status.active)
+            if(!(p->options & OPTION_INDIRECT) || from == myself)
+              send_request(p, "%d %s", KEY_CHANGED, from->name);
+        }
+    mykeyused = 0;
+  }
 cp
   return 0;
 }
@@ -1163,11 +1176,12 @@ cp
 
   /* Check if this key request is for us */
 
-  if(!strcmp(to_id, myself->name))
+  if(!strcmp(to_id, myself->name))	/* Yes, send our own key back */
     {
       bin2hex(myself->cipher_pktkey, pktkey, myself->cipher_pktkeylength);
       pktkey[myself->cipher_pktkeylength*2] = '\0';
       send_ans_key(myself, from, pktkey);
+      mykeyused = 1;
     }
   else
     {
@@ -1267,53 +1281,29 @@ int send_tcppacket(connection_t *cl, vpn_packet_t *packet)
 {
   int x;
 cp  
+  /* Evil hack. */
+
   x = send_request(cl->nexthop, "%d %hd", PACKET, packet->len);
 
   if(x)
     return x;
-  
-  return send_meta(cl->nexthop, packet->data, packet->len);  
+cp
+  return send_meta(cl, packet->data, packet->len);
 }
 
 int tcppacket_h(connection_t *cl)
 {
-  vpn_packet_t packet;
-  char *p;
-  int todo, x;
+  short int len;
 cp  
-  if(sscanf(cl->buffer, "%*d %hd", &packet.len) != 1)
+  if(sscanf(cl->buffer, "%*d %hd", &len) != 1)
     {
       syslog(LOG_ERR, _("Got bad PACKET from %s (%s)"), cl->name, cl->hostname);
       return -1;
     }
 
-  /* Evil hack. */
-
-  p = packet.data;
-  todo = packet.len;
-
-  while(todo)
-    {
-      x = read(cl->meta_socket, p, todo);
-
-      if(x<=0)
-        {
-          if(x==0)
-            syslog(LOG_NOTICE, _("Connection closed by %s (%s)"), cl->name, cl->hostname);
-          else
-            if(errno==EINTR || errno==EAGAIN)	/* FIXME: select() or poll() or reimplement this evil hack */
-              continue;
-            else
-              syslog(LOG_ERR, _("Error during reception of PACKET from %s (%s): %m"), cl->name, cl->hostname);
-
-          return -1;
-        }
-      
-      todo -= x;
-      p += x;
-    }
+  /* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */
 
-  receive_packet(cl, &packet);
+  cl->tcplen = len;
 cp
   return 0;
 }