src/thttpd-2.27/cgi-src/phf.c

   1 /* phf - cracker trap
   2 **
   3 ** Old distributions of the NCSA and Apache web servers included a
   4 ** version of the phf program that had a bug.  The program could
   5 ** easily be made to run arbitrary shell commands.  There is no real
   6 ** legitimate use for phf, so any attempts to run it must be considered
   7 ** to be attacks.  Accordingly, this version of phf logs the attack
   8 ** and then returns a page indicating that phf doesn't exist.
   9 **
  10 **
  11 ** Copyright © 1996 by Jef Poskanzer <jef@mail.acme.com>.
  12 ** All rights reserved.
  13 **
  14 ** Redistribution and use in source and binary forms, with or without
  15 ** modification, are permitted provided that the following conditions
  16 ** are met:
  17 ** 1. Redistributions of source code must retain the above copyright
  18 **    notice, this list of conditions and the following disclaimer.
  19 ** 2. Redistributions in binary form must reproduce the above copyright
  20 **    notice, this list of conditions and the following disclaimer in the
  21 **    documentation and/or other materials provided with the distribution.
  22 **
  23 ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24 ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26 ** ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27 ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28 ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29 ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30 ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32 ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33 ** SUCH DAMAGE.
  34 */
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <syslog.h>
  40
  41 #include "config.h"
  42
  43 static char* argv0;
  44
  45 int
  46 main( int argc, char* argv[] )
  47     {
  48     char* cp;
  49
  50     argv0 = argv[0];
  51     cp = strrchr( argv0, '/' );
  52     if ( cp != (char*) 0 )
  53         ++cp;
  54     else
  55         cp = argv0;
  56     openlog( cp, LOG_NDELAY|LOG_PID, LOG_FACILITY );
  57     syslog( LOG_CRIT, "phf CGI probe from %s", getenv( "REMOTE_ADDR" ) );
  58     (void) printf( "\
  59 Content-type: text/html\n\
  60 Status: 404/html\n\
  61 \n\
  62 <HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD>\n\
  63 <BODY><H2>404 Not Found</H2>\n\
  64 The requested object does not exist on this server.\n\
  65 The link you followed is either outdated, inaccurate,\n\
  66 or the server has been instructed not to let you have it.\n\
  67 </BODY></HTML>\n" );
  68     exit( 0 );
  69     }