Imported Upstream version 2.3_rc1

1 files changed, 0 insertions, 486 deletions

diff --git a/packet_id.c b/packet_id.c
deleted file mode 100644
index b11e71f..0000000
--- a/packet_id.c
+++ /dev/null
@@ -1,486 +0,0 @@
-/*
- *  OpenVPN -- An application to securely tunnel IP networks
- *             over a single TCP/UDP port, with support for SSL/TLS-based
- *             session authentication and key exchange,
- *             packet encryption, packet authentication, and
- *             packet compression.
- *
- *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2
- *  as published by the Free Software Foundation.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program (see the file COPYING included with this
- *  distribution); if not, write to the Free Software Foundation, Inc.,
- *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-
-/*
- * These routines are designed to catch replay attacks,
- * where a man-in-the-middle captures packets and then
- * attempts to replay them back later.
- *
- * We use the "sliding-window" algorithm, similar
- * to IPSec.
- */
-
-#include "syshead.h"
-
-#ifdef USE_CRYPTO
-
-#include "packet_id.h"
-#include "misc.h"
-#include "integer.h"
-
-#include "memdbg.h"
-
-/*
- * Special time_t value that indicates that
- * sequence number has expired.
- */
-#define SEQ_UNSEEN  ((time_t)0)
-#define SEQ_EXPIRED ((time_t)1)
-
-void
-packet_id_init (struct packet_id *p, int seq_backtrack, int time_backtrack)
-{
-  dmsg (D_PID_DEBUG_LOW, "PID packet_id_init seq_backtrack=%d time_backtrack=%d",
-       seq_backtrack,
-       time_backtrack);
-
-  ASSERT (p);
-  CLEAR (*p);
-
-  if (seq_backtrack)
-    {
-      ASSERT (MIN_SEQ_BACKTRACK <= seq_backtrack && seq_backtrack <= MAX_SEQ_BACKTRACK);
-      ASSERT (MIN_TIME_BACKTRACK <= time_backtrack && time_backtrack <= MAX_TIME_BACKTRACK);
-      CIRC_LIST_ALLOC (p->rec.seq_list, struct seq_list, seq_backtrack);
-      p->rec.seq_backtrack = seq_backtrack;
-      p->rec.time_backtrack = time_backtrack;
-    }
-  p->rec.initialized = true;
-}
-
-void
-packet_id_free (struct packet_id *p)
-{
-  if (p)
-    {
-      dmsg (D_PID_DEBUG_LOW, "PID packet_id_free");
-      if (p->rec.seq_list)
-	free (p->rec.seq_list);
-      CLEAR (*p);
-    }
-}
-
-void
-packet_id_add (struct packet_id_rec *p, const struct packet_id_net *pin)
-{
-  const time_t local_now = now;
-  if (p->seq_list)
-    {
-      packet_id_type diff;
-
-      /*
-       * If time value increases, start a new
-       * sequence number sequence.
-       */
-      if (!CIRC_LIST_SIZE (p->seq_list)
-	  || pin->time > p->time
-	  || (pin->id >= (packet_id_type)p->seq_backtrack
-	      && pin->id - (packet_id_type)p->seq_backtrack > p->id))
-	{
-	  p->time = pin->time;
-	  p->id = 0;
-	  if (pin->id > (packet_id_type)p->seq_backtrack)
-	    p->id = pin->id - (packet_id_type)p->seq_backtrack;
-	  CIRC_LIST_RESET (p->seq_list);
-	}
-
-      while (p->id < pin->id)
-	{
-	  CIRC_LIST_PUSH (p->seq_list, SEQ_UNSEEN);
-	  ++p->id;
-	}
-
-      diff = p->id - pin->id;
-      if (diff < (packet_id_type) CIRC_LIST_SIZE (p->seq_list)
-	  && local_now > SEQ_EXPIRED)
-	CIRC_LIST_ITEM (p->seq_list, diff) = local_now;
-    }
-  else
-    {
-      p->time = pin->time;
-      p->id = pin->id;
-    }
-}
-
-/*
- * Expire sequence numbers which can no longer
- * be accepted because they would violate
- * time_backtrack.
- */
-void
-packet_id_reap (struct packet_id_rec *p)
-{
-  const time_t local_now = now;
-  if (p->time_backtrack)
-    {
-      int i;
-      bool expire = false;
-      for (i = 0; i < CIRC_LIST_SIZE (p->seq_list); ++i)
-	{
-	  const time_t t = CIRC_LIST_ITEM (p->seq_list, i);
-	  if (t == SEQ_EXPIRED)
-	    break;
-	  if (!expire && t && t + p->time_backtrack < local_now)
-	    expire = true;
-	  if (expire)
-	    CIRC_LIST_ITEM (p->seq_list, i) = SEQ_EXPIRED;
-	}
-    }
-  p->last_reap = local_now;
-}
-
-/*
- * Return true if packet id is ok, or false if
- * it is a replay.
- */
-bool
-packet_id_test (const struct packet_id_rec *p,
-		const struct packet_id_net *pin)
-{
-  static int max_backtrack_stat;
-  packet_id_type diff;
-
-  dmsg (D_PID_DEBUG,
-       "PID TEST " time_format ":" packet_id_format " " time_format ":" packet_id_format "",
-       (time_type)p->time, (packet_id_print_type)p->id, (time_type)pin->time,
-       (packet_id_print_type)pin->id);
-
-  ASSERT (p->initialized);
-
-  if (!pin->id)
-    return false;
-
-  if (p->seq_backtrack)
-    {
-      /*
-       * In backtrack mode, we allow packet reordering subject
-       * to the seq_backtrack and time_backtrack constraints.
-       *
-       * This mode is used with UDP.
-       */
-      if (pin->time == p->time)
-	{
-	  /* is packet-id greater than any one we've seen yet? */
-	  if (pin->id > p->id)
-	    return true;
-
-	  /* check packet-id sliding window for original/replay status */
-	  diff = p->id - pin->id;
-
-	  /* keep track of maximum backtrack seen for debugging purposes */
-	  if ((int)diff > max_backtrack_stat)
-	    {
-	      max_backtrack_stat = (int)diff;
-	      msg (D_BACKTRACK, "Replay-window backtrack occurred [%d]", max_backtrack_stat);
-	    }
-
-	  if (diff >= (packet_id_type) CIRC_LIST_SIZE (p->seq_list))
-	    return false;
-
-	  return CIRC_LIST_ITEM (p->seq_list, diff) == 0;
-	}
-      else if (pin->time < p->time) /* if time goes back, reject */
-	return false;
-      else                          /* time moved forward */
-	return true;
-    }
-  else
-    {
-      /*
-       * In non-backtrack mode, all sequence number series must
-       * begin at some number n > 0 and must increment linearly without gaps.
-       *
-       * This mode is used with TCP.
-       */
-      if (pin->time == p->time)
-	return !p->id || pin->id == p->id + 1;
-      else if (pin->time < p->time) /* if time goes back, reject */
-	return false;
-      else                          /* time moved forward */
-	return pin->id == 1;
-    }
-}
-
-/*
- * Read/write a packet ID to/from the buffer.  Short form is sequence number
- * only.  Long form is sequence number and timestamp.
- */
-
-bool
-packet_id_read (struct packet_id_net *pin, struct buffer *buf, bool long_form)
-{
-  packet_id_type net_id;
-  net_time_t net_time;
-
-  pin->id = 0;
-  pin->time = 0;
-
-  if (!buf_read (buf, &net_id, sizeof (net_id)))
-    return false;
-  pin->id = ntohpid (net_id);
-  if (long_form)
-    {
-      if (!buf_read (buf, &net_time, sizeof (net_time)))
-	return false;
-      pin->time = ntohtime (net_time);
-    }
-  return true;
-}
-
-bool
-packet_id_write (const struct packet_id_net *pin, struct buffer *buf, bool long_form, bool prepend)
-{
-  packet_id_type net_id = htonpid (pin->id);
-  net_time_t net_time = htontime (pin->time);
-
-  if (prepend)
-    {
-      if (long_form)
-	{
-	  if (!buf_write_prepend (buf, &net_time, sizeof (net_time)))
-	    return false;
-	}
-      if (!buf_write_prepend (buf, &net_id, sizeof (net_id)))
-	return false;
-    }
-  else
-    {
-      if (!buf_write (buf, &net_id, sizeof (net_id)))
-	return false;
-      if (long_form)
-	{
-	  if (!buf_write (buf, &net_time, sizeof (net_time)))
-	    return false;
-	}
-    }
-  return true;
-}
-
-const char *
-packet_id_net_print (const struct packet_id_net *pin, bool print_timestamp, struct gc_arena *gc)
-{
-  struct buffer out = alloc_buf_gc (256, gc);
-
-  buf_printf (&out, "[ #" packet_id_format, (packet_id_print_type)pin->id);
-  if (print_timestamp && pin->time)
-      buf_printf (&out, " / time = (" packet_id_format ") %s", 
-		  (packet_id_print_type)pin->time,
-		  time_string (pin->time, 0, false, gc));
-
-  buf_printf (&out, " ]");
-  return BSTR (&out);
-}
-
-/* initialize the packet_id_persist structure in a disabled state */
-void
-packet_id_persist_init (struct packet_id_persist *p)
-{
-  p->filename = NULL;
-  p->fd = -1;
-  p->time = p->time_last_written = 0;
-  p->id = p->id_last_written = 0;
-}
-
-/* close the file descriptor if it is open, and switch to disabled state */
-void
-packet_id_persist_close (struct packet_id_persist *p)
-{
-  if (packet_id_persist_enabled (p))
-    {
-      if (close (p->fd))
-	msg (D_PID_PERSIST | M_ERRNO, "Close error on --replay-persist file %s", p->filename);
-      packet_id_persist_init (p);
-    }
-}
-
-/* load persisted rec packet_id (time and id) only once from file, and set state to enabled */
-void
-packet_id_persist_load (struct packet_id_persist *p, const char *filename)
-{
-  struct gc_arena gc = gc_new ();
-  if (!packet_id_persist_enabled (p))
-    {
-      /* open packet-id persist file for both read and write */
-      p->fd = open (filename,
-		    O_CREAT | O_RDWR | O_BINARY,
-		    S_IRUSR | S_IWUSR);
-      if (p->fd == -1)
-	{
-	  msg (D_PID_PERSIST | M_ERRNO,
-	       "Cannot open --replay-persist file %s for read/write",
-	       filename);
-	}
-      else
-	{
-	  struct packet_id_persist_file_image image;
-	  ssize_t n;
-
-#if defined(HAVE_FLOCK) && defined(LOCK_EX) && defined(LOCK_NB)
-	  if (flock (p->fd, LOCK_EX | LOCK_NB))
-	    msg (M_ERR, "Cannot obtain exclusive lock on --replay-persist file %s", filename);
-#endif
-
-	  p->filename = filename;
-	  n = read (p->fd, &image, sizeof(image));
-	  if (n == sizeof(image))
-	    {
-	      p->time = p->time_last_written = image.time;
-	      p->id = p->id_last_written = image.id;
-	      dmsg (D_PID_PERSIST_DEBUG, "PID Persist Read from %s: %s",
-		   p->filename, packet_id_persist_print (p, &gc));
-	    }
-	  else if (n == -1)
-	    {
-	      msg (D_PID_PERSIST | M_ERRNO,
-		   "Read error on --replay-persist file %s",
-		   p->filename);
-	    }
-	}
-    }
-  gc_free (&gc);
-}
-
-/* save persisted rec packet_id (time and id) to file (only if enabled state) */
-void
-packet_id_persist_save (struct packet_id_persist *p)
-{
-  if (packet_id_persist_enabled (p) && p->time && (p->time != p->time_last_written ||
-						   p->id != p->id_last_written))
-    {
-      struct packet_id_persist_file_image image;
-      ssize_t n;
-      off_t seek_ret;
-      struct gc_arena gc = gc_new ();
-
-      image.time = p->time;
-      image.id = p->id;
-      seek_ret = lseek(p->fd, (off_t)0, SEEK_SET);
-      if (seek_ret == (off_t)0)
-	{
-	  n = write(p->fd, &image, sizeof(image));
-	  if (n == sizeof(image))
-	    {
-	      p->time_last_written = p->time;
-	      p->id_last_written = p->id;
-	      dmsg (D_PID_PERSIST_DEBUG, "PID Persist Write to %s: %s",
-		   p->filename, packet_id_persist_print (p, &gc));
-	    }
-	  else
-	    {
-	      msg (D_PID_PERSIST | M_ERRNO,
-		   "Cannot write to --replay-persist file %s",
-		   p->filename);
-	    }
-	}
-      else
-	{
-	  msg (D_PID_PERSIST | M_ERRNO,
-	       "Cannot seek to beginning of --replay-persist file %s",
-	       p->filename);
-	}
-      gc_free (&gc);
-    }
-}
-
-/* transfer packet_id_persist -> packet_id */
-void
-packet_id_persist_load_obj (const struct packet_id_persist *p, struct packet_id *pid)
-{
-  if (p && pid && packet_id_persist_enabled (p) && p->time)
-    {
-      pid->rec.time = p->time;
-      pid->rec.id = p->id;
-    }
-}
-
-const char *
-packet_id_persist_print (const struct packet_id_persist *p, struct gc_arena *gc)
-{
-  struct buffer out = alloc_buf_gc (256, gc);
-
-  buf_printf (&out, "[");
-
-  if (packet_id_persist_enabled (p))
-    {
-      buf_printf (&out, " #" packet_id_format, (packet_id_print_type)p->id);
-      if (p->time)
-	buf_printf (&out, " / time = (" packet_id_format ") %s",
-		    (packet_id_print_type)p->time,
-		    time_string (p->time, 0, false, gc));
-    }
-
-  buf_printf (&out, " ]");
-  return (char *)out.data;
-}
-
-#ifdef PID_TEST
-
-void
-packet_id_interactive_test ()
-{
-  struct packet_id pid;
-  struct packet_id_net pin;
-  bool long_form;
-  bool count = 0;
-  bool test;
-
-  const int seq_backtrack = 10;
-  const int time_backtrack = 10;
-
-  packet_id_init (&pid, seq_backtrack, time_backtrack);
-
-  while (true) {
-    char buf[80];
-    if (!fgets(buf, sizeof(buf), stdin))
-      break;
-    update_time ();
-    if (sscanf (buf, "%lu,%u", &pin.time, &pin.id) == 2)
-      {
-	packet_id_reap_test (&pid.rec);
-	test = packet_id_test (&pid.rec, &pin);
-	printf ("packet_id_test (" time_format ", " packet_id_format ") returned %d\n",
-		(time_type)pin.time,
-		(packet_id_print_type)pin.id,
-		test);
-	if (test)
-	  packet_id_add (&pid.rec, &pin);
-      }
-    else
-      {
-	long_form = (count < 20);
-	packet_id_alloc_outgoing (&pid.send, &pin, long_form);
-	printf ("(" time_format "(" packet_id_format "), %d)\n",
-		(time_type)pin.time,
-		(packet_id_print_type)pin.id,
-		long_form);
-	if (pid.send.id == 10)
-	  pid.send.id = 0xFFFFFFF8;
-	++count;
-      }
-  }
-  packet_id_free (&pid);
-}
-#endif
-
-#endif /* USE_CRYPTO */