- Use CFB mode for encrypting packets: it works and we don't need padding.

diff --git a/src/connlist.h b/src/connlist.h
index d3b2ce3..d993c84 100644 (file)
--- a/src/connlist.h
+++ b/src/connlist.h
@@ -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: connlist.h,v 1.1.2.7 2000/10/29 01:27:23 guus Exp $
+    $Id: connlist.h,v 1.1.2.8 2000/10/29 22:10:41 guus Exp $
 */
 
 #ifndef __TINC_CONNLIST_H__
@@ -70,9 +70,9 @@ typedef struct conn_list_t {
   EVP_CIPHER_CTX *cipher_inctx;    /* Context of encrypted meta data that will come from him to us */
   EVP_CIPHER_CTX *cipher_outctx;   /* Context of encrypted meta data that will be sent from us to him */
 
-  EVP_CIPHER_CTX *cipher_pktctx;   /* Context of encrypted vpn packets that will be sent to him */
   EVP_CIPHER *cipher_pkttype;      /* Cipher type for encrypted vpn packets */ 
-  char *cipher_pktkey;             /* Cipher key */
+  char *cipher_pktkey;             /* Cipher key and iv */
+  int cipher_pktkeylength;         /* Cipher key and iv length*/
 
   char *buffer;                    /* metadata input buffer */
   int buflen;                      /* bytes read into buffer */

diff --git a/src/net.c b/src/net.c
index e62bb8d..5450b9a 100644 (file)
--- a/src/net.c
+++ b/src/net.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: net.c,v 1.35.4.54 2000/10/29 10:39:06 guus Exp $
+    $Id: net.c,v 1.35.4.55 2000/10/29 22:10:42 guus Exp $
 */
 
 #include "config.h"
@@ -111,7 +111,9 @@ int xsend(conn_list_t *cl, vpn_packet_t *inpkt)
 cp
   outpkt.len = inpkt->len;
   
-  EVP_EncryptInit(&ctx, cl->cipher_pkttype, cl->cipher_pktkey, cl->cipher_pktkey);
+  /* Encrypt the packet */
+  
+  EVP_EncryptInit(&ctx, cl->cipher_pkttype, cl->cipher_pktkey, cl->cipher_pktkey + cl->cipher_pkttype->key_len);
   EVP_EncryptUpdate(&ctx, outpkt.data, &outlen, inpkt->data, inpkt->len);
   EVP_EncryptFinal(&ctx, outpkt.data + outlen, &outpad);
   outlen += outpad + 2;
@@ -146,8 +148,11 @@ int xrecv(vpn_packet_t *inpkt)
   EVP_CIPHER_CTX ctx;
 cp
   outpkt.len = inpkt->len;
-  EVP_DecryptInit(&ctx, myself->cipher_pkttype, myself->cipher_pktkey, NULL);
-  EVP_DecryptUpdate(&ctx, outpkt.data, &outlen, inpkt->data, inpkt->len);
+
+  /* Decrypt the packet */
+
+  EVP_DecryptInit(&ctx, myself->cipher_pkttype, myself->cipher_pktkey, myself->cipher_pktkey + myself->cipher_pkttype->key_len);
+  EVP_DecryptUpdate(&ctx, outpkt.data, &outlen, inpkt->data, inpkt->len + 8);
   EVP_DecryptFinal(&ctx, outpkt.data + outlen, &outpad);
   outlen += outpad;
 
@@ -156,6 +161,10 @@ cp
   memcpy(&outpkt, inpkt, outlen);
 */
      
+  if(debug_lvl >= DEBUG_TRAFFIC)
+    syslog(LOG_ERR, _("Writing packet of %d (%d) bytes to tap device"),
+           outpkt.len, outlen);
+
   /* Fix mac address */
 
   memcpy(outpkt.data, mymac.net.mac.address.x, 6);
@@ -770,10 +779,12 @@ cp
 
   /* Generate packet encryption key */
 
-  myself->cipher_pkttype = EVP_bf_cbc();
+  myself->cipher_pkttype = EVP_bf_cfb();
+
+  myself->cipher_pktkeylength = myself->cipher_pkttype->key_len + myself->cipher_pkttype->iv_len;
 
-  myself->cipher_pktkey = (char *)xmalloc(64);
-  RAND_bytes(myself->cipher_pktkey, 64);
+  myself->cipher_pktkey = (char *)xmalloc(myself->cipher_pktkeylength);
+  RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength);
 
   if(!(cfg = get_config_val(config, keyexpire)))
     keylifetime = 3600;
@@ -1041,6 +1052,7 @@ int handle_incoming_vpn_data()
   vpn_packet_t pkt;
   int x, l = sizeof(x);
   struct sockaddr from;
+  int lenin;
   socklen_t fromlen = sizeof(from);
 cp
   if(getsockopt(myself->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
@@ -1055,18 +1067,17 @@ cp
       return -1;
     }
 
-  if(recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, &from, &fromlen) <= 0)
+  if((lenin = recvfrom(myself->socket, (char *) &(pkt.len), MTU, 0, &from, &fromlen)) <= 0)
     {
       syslog(LOG_ERR, _("Receiving packet failed: %m"));
       return -1;
     }
-/*
+
   if(debug_lvl >= DEBUG_TRAFFIC)
     {
-      syslog(LOG_DEBUG, _("Received packet of %d bytes from %d.%d.%d.%d"), pkt.len,
-             from.sa_addr[0], from.sa_addr[1], from.sa_addr[2], from.sa_addr[3]);
+      syslog(LOG_DEBUG, _("Received packet of %d bytes"), lenin);
     } 
-*/
+
 cp
   return xrecv(&pkt);
 }
@@ -1362,7 +1373,7 @@ cp
               if(debug_lvl >= DEBUG_STATUS)
                 syslog(LOG_INFO, _("Regenerating symmetric key"));
                 
-              RAND_bytes(myself->cipher_pktkey, 64);
+              RAND_bytes(myself->cipher_pktkey, myself->cipher_pktkeylength);
               send_key_changed(myself, NULL);
               keyexpires = time(NULL) + keylifetime;
             }

diff --git a/src/protocol.c b/src/protocol.c
index d9b10df..d3b34c9 100644 (file)
--- 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 1.28.4.51 2000/10/29 10:39:08 guus Exp $
+    $Id: protocol.c,v 1.28.4.52 2000/10/29 22:10:43 guus Exp $
 */
 
 #include "config.h"
@@ -471,7 +471,8 @@ cp
   cl->allow_request = ALL;
   cl->status.active = 1;
   cl->nexthop = cl;
-  cl->cipher_pkttype = EVP_bf_cbc();
+  cl->cipher_pkttype = EVP_bf_cfb();
+  cl->cipher_pktkeylength = cl->cipher_pkttype->key_len + cl->cipher_pkttype->iv_len;
 
   if(debug_lvl >= DEBUG_CONNECTIONS)
     syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
@@ -1015,8 +1016,8 @@ cp
 
   if(!strcmp(to_id, myself->name))
     {
-      bin2hex(myself->cipher_pktkey, pktkey, 64);
-      pktkey[128] = 0;
+      bin2hex(myself->cipher_pktkey, pktkey, myself->cipher_pktkeylength);
+      pktkey[myself->cipher_pktkeylength*2] = '\0';
       send_ans_key(myself, from, pktkey);
     }
   else
@@ -1028,7 +1029,15 @@ cp
           free(from_id); free(to_id);
           return -1;
         }
-      send_req_key(from, to);
+        
+      if(to->status.validkey)  /* Proxy keys */
+        {
+          bin2hex(to->cipher_pktkey, pktkey, to->cipher_pktkeylength);
+          pktkey[to->cipher_pktkeylength*2] = '\0';
+          send_ans_key(to, from, pktkey);
+        }
+      else
+        send_req_key(from, to);
     }
 
   free(from_id); free(to_id);
@@ -1068,9 +1077,9 @@ cp
 
   keylength = strlen(pktkey);
 
-  if((keylength%2)!=0 || (keylength <= 0))
+  if(keylength != from->cipher_pktkeylength*2)
     {
-      syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key"),
+      syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key length"),
              cl->name, cl->hostname, from->name);
       free(from_id); free(to_id); free(pktkey);
       return -1;

diff --git a/src/tincd.c b/src/tincd.c
index 7548235..2e607b6 100644 (file)
--- a/src/tincd.c
+++ b/src/tincd.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: tincd.c,v 1.10.4.19 2000/10/29 09:19:27 guus Exp $
+    $Id: tincd.c,v 1.10.4.20 2000/10/29 22:10:44 guus Exp $
 */
 
 #include "config.h"
@@ -33,6 +33,7 @@
 #include <signal.h>
 #include <openssl/rand.h>
 #include <openssl/rsa.h>
+#include <openssl/err.h>
 #include <string.h>
 
 #ifdef HAVE_SYS_IOCTL_H
@@ -436,10 +437,9 @@ main(int argc, char **argv, char **envp)
   if(detach())
     exit(0);
 
-/* FIXME: wt* is this suppose to do?
-  if(security_init())
-    return 1;
-*/
+  if(debug_lvl >= DEBUG_ERROR)
+    ERR_load_crypto_strings();
+    
   for(;;)
     {
       if(!setup_network_connections())