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shell.php
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shell.php
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<?php
$users = array('admin'=>'secret_password'); // change this!
$home = realpath('.'); // config
function authenticate($u) {
if (!isset($_SERVER['PHP_AUTH_USER'])) die(header('WWW-Authenticate: Basic realm="shell.php"',401));
if (!isset($u[$_SERVER['PHP_AUTH_USER']]) || $u[$_SERVER['PHP_AUTH_USER']]!=$_SERVER['PHP_AUTH_PW']) die();
if ($_SERVER['PHP_AUTH_PW']=='secret_password') die('change default password in line 2 of shell.php');
}
authenticate($users);
$commands = array('view','edit','upload','download','own');
$style = <<<END_OF_STYLE
body { margin: 8px; font-family:mono; font-size:12px; color: black; }
a{ color: grey; }
a:hover{ color: blue; }
a.copy{ color: black; text-decoration:none; }
END_OF_STYLE;
$microAjax = <<<END_OF_JAVASCRIPT
function microAjax(B,A){this.bindFunction=function(E,D){return function(){return E.apply(D,[D])}};this.stateChange=function(D){if(this.request.readyState==4){this.callbackFunction(this.request.responseText)}};this.getRequest=function(){if(window.ActiveXObject){return new ActiveXObject("Microsoft.XMLHTTP")}else{if(window.XMLHttpRequest){return new XMLHttpRequest()}}return false};this.postBody=(arguments[2]||"");this.callbackFunction=A;this.url=B;this.request=this.getRequest();if(this.request){var C=this.request;C.onreadystatechange=this.bindFunction(this.stateChange,this);if(this.postBody!==""){C.open("POST",B,true);C.setRequestHeader("X-Requested-With","XMLHttpRequest");C.setRequestHeader("Content-type","application/x-www-form-urlencoded");C.setRequestHeader("Connection","close")}else{C.open("GET",B,true)}C.send(this.postBody)}};
END_OF_JAVASCRIPT;
function bash()
{ global $home;
global $a;
global $commands;
global $style;
global $microAjax;
if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') die('Windows not supported');
$jsonCommands = json_encode($commands);
$suggestions = links(array('cd \'~\''=>'cd \'~\'','upload'=>'upload'));
$processUser = posix_getpwuid(posix_geteuid());
$prompt = '<span id="prompt">'.$processUser['name'].'@'.php_uname('n').':<span id="dir">~</span>$ </span>';
echo <<<END_OF_HTML
<html><head>
<style>
$style
</style>
<script type="text/javascript">
$microAjax
var ls = 'ls -al';
function focus()
{ document.forms[0].elements[0].focus();
window.scrollTo(0,document.forms[0].elements[0].offsetTop);
}
function ondata(str)
{ var command = document.forms[0].elements[0].value;
eval('var data = '+str);
text = data.output;
var newText = document.createElement('span');
newText.innerHTML = text;
var history = document.getElementById('history');
var iscd = text.split("\\n")[0].indexOf('\$ cd ')>=0;
if (iscd) history.innerHTML="";
history.appendChild(newText);
document.getElementById('dir').innerHTML=data.dir;
document.forms[0].elements[0].value = "";
focus();
if (iscd)
{ document.forms[0].elements[0].value = ls;
onenter();
}
}
function activate(a)
{ document.forms[0].elements[0].value = a.title;
onenter();
return false;
}
function copy(a)
{ var s = document.forms[0].elements[0].value;
if (s.length && s.substr(s.length-1,1)!=' ') s+=' ';
document.forms[0].elements[0].value = s+a.title+' ';
return false;
}
function onenter()
{ var command = document.forms[0].elements[0].value;
if (command.substr(0,4)=='ls -') ls = command;
var dir = document.getElementById('dir').innerHTML;
var real = dir.replace(/^~/,'$home');
var commands = $jsonCommands;
if (command=='clear' || command=='exit')
{ document.getElementById('history').innerHTML="";
document.forms[0].elements[0].value = "";
return false;
}
for (var c in commands)
{ c = commands[c];
var entered = command.substr(0,c.length+1)
if (entered==c || entered==c+' ')
{ var newText = document.createElement('span');
var prompt = document.getElementById('prompt');
newText.innerHTML = (prompt.textContent||prompt.innerText)+command+"\\n";
var history = document.getElementById('history');
history.appendChild(newText);
document.forms[0].elements[0].value = "";
var application = encodeURIComponent(c);
var argument = command.substr(c.length+1);
argument = argument.replace(/^('(.*)')|([^'].*)$/,'$2$3');
argument = encodeURIComponent(argument);
real = encodeURIComponent(real);
document.location = '?application='+application+'&directory='+real+'&argument='+argument;
return false;
}
}
command = encodeURIComponent(command);
dir = encodeURIComponent(dir);
microAjax('?application=command&command='+command+'&dir='+dir, ondata);
return false;
}
document.onkeypress = function doSomething(e) {
var code;
if (!e) var e = window.event;
if (e.target==document.forms[0].elements[0]) return;
if (e.keyCode) code = e.keyCode;
else if (e.which) code = e.which;
var character = String.fromCharCode(code);
document.forms[0].elements[0].value+=character;
focus();
}
</script></head><body style="margin:8px;" onload="document.forms[0].elements[0].value = ls; onenter();">
<pre id="history" style="display:inline;padding:0;margin:0;">
</pre><pre style="display:inline;padding:0;margin:0;">
<form style="display:inline; padding:0; margin:0;" onsubmit="return onenter();">$prompt<input style="font-family:mono; font-size:12px; color: black; padding:0; margin:0; border:0; width:40em;" type="text" name="command" autocomplete="off"\></form>
<div>$suggestions</div>
</body></html>
END_OF_HTML;
}
function expand($home,$dir,$path)
{ preg_match('/^(~?)(\/?)(.*)$/',$path,$matches);
if ($matches[1]) @$newdir = $home.$matches[2].$matches[3];
else if ($matches[2]) @$newdir = $matches[2].$matches[3];
else @$newdir = $dir.'/'.$matches[3];
if (file_exists($newdir)) return realpath($newdir);
return $newdir;
}
function alt_stat($file)
{ clearstatcache();
$ss=@stat($file);
if(!$ss) return false; //Couldnt stat file
$ts=array(
0140000=>'ssocket',
0120000=>'llink',
0100000=>'-file',
0060000=>'bblock',
0040000=>'ddir',
0020000=>'cchar',
0010000=>'pfifo',
);
$p=$ss['mode'];
$t=decoct($ss['mode'] & 0170000); // File Encoding Bit
$str =(array_key_exists(octdec($t),$ts))?$ts[octdec($t)]{0}:'u';
$str.=(($p&0x0100)?'r':'-').(($p&0x0080)?'w':'-');
$str.=(($p&0x0040)?(($p&0x0800)?'s':'x'):(($p&0x0800)?'S':'-'));
$str.=(($p&0x0020)?'r':'-').(($p&0x0010)?'w':'-');
$str.=(($p&0x0008)?(($p&0x0400)?'s':'x'):(($p&0x0400)?'S':'-'));
$str.=(($p&0x0004)?'r':'-').(($p&0x0002)?'w':'-');
$str.=(($p&0x0001)?(($p&0x0200)?'t':'x'):(($p&0x0200)?'T':'-'));
$type = substr($ts[octdec($t)],1);
$owner = posix_getpwuid($ss['uid']);
$group = posix_getgrgid($ss['gid']);
$s=array(
'human'=>$str,
'owner'=>$owner['name'],
'group'=>$group['name'],
'realpath'=>@realpath($file),
'dirname'=>@dirname($file),
'basename'=>@basename($file),
'type'=>$type,
'type_octal'=>sprintf("%07o", octdec($t)),
'is_file'=>@is_file($file),
'is_dir'=>@is_dir($file),
'is_link'=>@is_link($file),
'is_readable'=> @is_readable($file),
'is_writable'=> @is_writable($file),
'device'=>$ss['dev'], //Device
'device_number'=>$ss['rdev'], //Device number, if device.
'inode'=>$ss['ino'], //File serial number
'link_count'=>$ss['nlink'], //link count
'link_to'=>($type=='link') ? @readlink($file) : '',
'size'=>$ss['size'], //Size of file, in bytes.
'blocks'=>$ss['blocks'], //Number 512-byte blocks allocated
'block_size'=> $ss['blksize'], //Optimal block size for I/O.
'accessed'=>@date('Y-m-d H:i',$ss['atime']),
'modified'=>@date('Y-m-d H:i',$ss['mtime']),
'created'=>@date('Y-m-d H:i',$ss['ctime']),
);
clearstatcache();
return $s;
}
function links($commands)
{ $output = '';
foreach ($commands as $text=>$href)
{ $h = addslashes($href);
if ($text=='rm') $output.= "<a href=\"#\" title=\"$href\" onclick=\"if (confirm('You are about to:\\n\\n$h\\n\\nAre you sure?')) activate(this); return false\">$text</a> ";
else $output.= "<a href=\"#\" title=\"$href\" onclick=\"return activate(this);\">$text</a> ";
}
return $output;
}
function action($sdir,$s)
{ $commands = array();
$user = posix_getpwuid(posix_getuid());
$username = $user['name'];
if ($s['is_dir'])
{ $b = escapeshellarg($s['basename']);
if ($s['is_readable'])
{ $commands['cd'] = "cd $b";
}
if ($s['is_writable'])
{ if ($s['basename']=='.')
{ $r = escapeshellarg(basename($s['realpath'].'_'.date('YmdHi').'.zip'));
$d = escapeshellarg('.');
$commands['zip'] = "zip -r $r $d";
}
if ($s['basename']!='.' && $s['basename']!='..')
{ $commands['rm'] = "rm -R $b";
}
}
}
else if ($s['is_file'])
{ $t = escapeshellarg($s['basename'].'.tmp');
$b = escapeshellarg($s['basename']);
if ($s['is_readable'])
{ $commands['view'] = "view $b";
$commands['download'] = "download $b";
}
if ($s['is_writable'])
{ $commands['edit'] = "edit $b";
}
if ($sdir['is_writable'])
{ if ($s['owner']!=$username)
{ $commands['own'] = "mv $b $t; cp $t $b; rm $t";
}
$commands['rm'] = "rm $b";
if (preg_match('/^(.*)\.zip$/',$s['basename'],$matches))
{ $d = escapeshellarg($matches[1]);
$commands['unzip'] = "unzip $b -d $d";
}
}
}
return links($commands);
}
function ls($flags,$dir)
{ $files = scandir($dir);
$data = array();
$all = strpos($flags,'a')!==false;
if (strpos($flags,'l')===false) $columns = array('basename'=>'l','action'=>'');
else $columns = array('human'=>'l','link_count'=>'r','owner'=>'l','group'=>'l','size'=>'r','modified'=>'l','basename'=>'l','action'=>'');
foreach (array_keys($columns) as $column) $data[$column] = array();
$sdir = alt_stat($dir);
foreach($files as $file)
{ if (substr($file,0,1)=='.' && !$all) continue;
$s = alt_stat($dir.'/'.$file);
foreach ($columns as $column=>$align)
{ if ($column != 'action') $data[$column][] = $s[$column];
else $data[$column][] = action($sdir,$s);
}
}
$output='';
$lengths = array();
foreach ($columns as $column=>$align)
{ $length[$column]=0;
foreach ($data[$column] as $s)
{ $length[$column]=max($length[$column],strlen($s));
}
}
$rmax = count($data[$column]);
for ($r=0;$r<$rmax;$r++)
{ foreach ($columns as $column=>$align)
{ $d = $data[$column][$r];
if ($align=='l') $d = str_pad($d, $length[$column], " ", STR_PAD_RIGHT);
if ($align=='r') $d = str_pad($d, $length[$column], " ", STR_PAD_LEFT);
if ($align=='c') $d = str_pad($d, $length[$column], " ", STR_PAD_BOTH);
if ($column=='basename') $output.= '<a href="#" class="copy" onclick="return copy(this);" title="'.escapeshellarg($data[$column][$r]).'">'.$d.'</a> ';
else $output.= $d.' ';
}
$output.= "\n";
}
return $output;
}
function command()
{ global $home;
$command = false;
$dir = $home;
$output = false;
$processUser = posix_getpwuid(posix_geteuid());
$prompt = '<span id="prompt">'.$processUser['name'].'@'.php_uname('n').':<span id="dir">~</span>$ </span>';
if (isset($_GET['command'])) $command = $_GET['command'];
if (isset($_GET['dir'])) $dir = $_GET['dir'];
$olddir = $dir;
if (substr($dir,0,1)=='~') $dir = $home.substr($dir,1);
header('Content-Type: text/plain');
$output = '';
if (preg_match('/^cd (.*)$/',trim($command),$matches))
{ $argument = $matches[1];
$real = false;
if (preg_match('/^\'(.*)\'|([^\'].*)$/',$argument,$matches))
{ if (isset($matches[1])) $argument = $matches[1];
if (isset($matches[2])) $argument = $matches[2];
$real = expand($home,$dir,$argument);
}
if (!$argument || !$real || !file_exists($real))
{ $output.="bash: $command: No such file or directory\n";
}
else if (!is_readable($real))
{ $output.="bash: $command: can't cd to directory\n";
}
else
{ $dir = $real;
}
}
else if (preg_match('/^ls( -[a-zA-Z0-9]+)?( \'(.+)\')?/',$command,$matches))
{ $flags = '';
if (isset($matches[1])) $flags = substr($matches[1],2);
if (isset($matches[2])) $real = expand($home,$dir,$matches[3]);
else $real = realpath($dir);
if (!file_exists($real))
{ $output.="bash: $command($real): No such file or directory\n";
}
else
{ $output.=ls($flags,$real);
}
}
else
{ chdir($dir);
$output=myshellexec($command." 2>&1");
}
if (substr($dir,0,strlen($home))==$home) $dir = '~'.substr($dir,strlen($home));
$output = $processUser['name'].'@'.php_uname('n').':'.$olddir.'$ '.$command."\n".$output;
echo json_encode(array('dir'=>$dir,'output'=>$output));
}
function myshellexec($cfe)
{ $res = '';
if (!empty($cfe))
{ if(@function_exists('passthru'))
{ @ob_start();
@passthru($cfe);
$res = @ob_get_contents();
@ob_end_clean();
}
elseif(@function_exists('exec'))
{ @exec($cfe,$res);
$res = join("\n",$res);
}
elseif(@function_exists('shell_exec'))
{ $res = @shell_exec($cfe);
}
elseif(@function_exists('system'))
{ @ob_start();
@system($cfe);
$res = @ob_get_contents();
@ob_end_clean();
}
elseif(@is_resource($f = @popen($cfe,"r")))
{ $res = "";
if (@function_exists('fread') &&@function_exists('feof'))
{ while(!@feof($f)) {$res .= @fread($f,1024);}
}
elseif(@function_exists('fgets') &&@function_exists('feof'))
{ while(!@feof($f)) {$res .= @fgets($f,1024);}
}
@pclose($f);
}
elseif(@is_resource($f = @proc_open($cfe,array(1 =>array("pipe","w")),$pipes)))
{ $res = "";
if(@function_exists('fread') &&@function_exists('feof'))
{ while(!@feof($pipes[1])) {$res .= @fread($pipes[1],1024);}
}
elseif(@function_exists('fgets') &&@function_exists('feof'))
{ while(!@feof($pipes[1])) {$res .= @fgets($pipes[1],1024);}
}
@proc_close($f);
}
}
return $res;
}
function view()
{ global $home;
if (!isset($_GET['directory'])) error_exit(false,'no directory specified');
if (!isset($_GET['argument'])) error_exit(false,'no argument specified');
$directory = $_GET['directory'];
$argument = $_GET['argument'];
$file = expand($home,$directory,$argument);
$basename = basename($file);
if (!file_exists($file)) error_exit(false,'cannot find file');
if (!is_file($file)) error_exit(false,'argument must be a file');
$content = file_get_contents($file);
if (strpos($content,"\0")===false)
{ header('Content-Type: text/plain');
echo $content;
}
else if ($size = getimagesize($file))
{ header('Content-Type: '.$size['mime']);
echo $content;
}
else
{ header("Pragma: public"); // required
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false); // required for certain browsers
header("Content-Type: ".mime_content_type($basename));
header("Content-Disposition: attachment; filename=\"$basename\"");
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".strlen($content));
ob_clean();
flush();
echo $content;
}
}
function download()
{ global $home;
if (!isset($_GET['directory'])) error_exit(false,'no directory specified');
if (!isset($_GET['argument'])) error_exit(false,'no argument specified');
$directory = $_GET['directory'];
$argument = $_GET['argument'];
$file = expand($home,$directory,$argument);
$basename = basename($file);
if (!file_exists($file)) error_exit(false,'cannot find file');
header("Pragma: public"); // required
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false); // required for certain browsers
header("Content-Type: ".mime_content_type($basename));
header("Content-Disposition: attachment; filename=\"$basename\"");
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($file));
ob_clean();
flush();
readfile($file);
}
function edit()
{ global $home;
global $style;
global $microAjax;
if (!isset($_GET['directory'])) error_exit(false,'no directory specified');
if (!isset($_GET['argument'])) error_exit(false,'no argument specified');
$directory = $_GET['directory'];
$argument = $_GET['argument'];
$file = expand($home,$directory,$argument);
$basename = basename($file);
if (!file_exists($file)) error_exit(false,'cannot find file');
if (!is_file($file)) error_exit(false,'argument must be a file');
if (isset($_POST['text']))
{ $text = $_POST['text'];
if (file_put_contents($file,$text)) die('file saved');
else die('save failed');
}
$content = file_get_contents($file);
if (strpos($content,"\0")!==false) error_exit(false,'binary file detected');
$content = json_encode($content);
echo <<<END_OF_HTML
<html><head>
<style>
$style
</style>
<script type="text/javascript">
var content = $content;
$microAjax
function focus()
{ document.forms[0].elements[0].focus();
}
function ondata(str)
{ history.go(-1);
}
function activate(a)
{ var text = document.forms[0].elements[0].value;
text = encodeURIComponent(text);
microAjax(document.location.href, ondata,'text='+text);
return false;
}
document.onclick = focus;
</script>
</head>
<body onload="document.forms[0].elements[0].value=content;document.forms[0].elements[0].style.display='block';"><form style="display:inline;"><textarea style="resize:none;border:0;display:none;width:100%;height:100%;color:black;"></textarea><div style="position:absolute; top:0; right:0;"><div style="margin: 8px; padding: 5px; border:1px solid silver; background: white;"><span id="basename"><a href="#" title="save" onclick="return activate(this)">save</a></div></div></form>
</body></html>
END_OF_HTML;
}
function error_exit($success,$message)
{ global $style;
$result = $success?'SUCCEEDED':'FAILED';
$back = isset($_POST['overwrite'])?2:1;
echo <<<END_OF_HTML
<html><head><style>$style</style></head><body><pre>
$result: $message
<button onclick="history.go(-$back);">ok</button></pre></body></html>
END_OF_HTML;
exit;
}
function upload()
{ global $home;
global $style;
if (!isset($_GET['directory'])) error_exit(false,'no directory specified');
$directory = $_GET['directory'];
if (!is_writable($directory)) error_exit(false,'target directory not writable');
if (isset($_POST['overwrite']))
{ $overwrite = $_POST['overwrite']=='yes';
$error = $_FILES["file"]["error"];
if ($error > 0)
{ switch($error)
{ case 1: error_exit(false,'file exceeds the upload_max_filesize');
case 2: error_exit(false,'file exceeds the MAX_FILE_SIZE');
case 3: error_exit(false,'file was only partially uploaded');
case 4: error_exit(false,'no file was uploaded');
case 5: error_exit(false,'missing a temporary folder');
case 6: error_exit(false,'no file was uploaded');
case 7: error_exit(false,'failed to write file to disk');
case 8: error_exit(false,'file upload stopped by extension');
default: error_exit(false,'upload failed');
}
}
$basename = $_FILES["file"]["name"];
$file = expand($home,$directory,$basename);
if (file_exists($file) && !$overwrite) error_exit(false,'file already exists');
$tmp = $_FILES["file"]["tmp_name"];
if (!move_uploaded_file($tmp,$file)) error_exit(false,'file cannot be moved');
error_exit(true,'file uploaded');
}
echo <<<END_OF_HTML
<html><head><style>$style</style></head><body>
<pre><form method="post" enctype="multipart/form-data" style="display:inline;"><label for="target">target directory:</label>
<input name="target" type="text" value="$directory/" disabled="disabled" size="40"/>
<label for="file">file to upload:</label>
<input name="file" type="file"/>
<label for="overwrite">overwrite if file exists?</label>
<input name="overwrite" type="radio" value="yes"/> yes
<input name="overwrite" type="radio" value="no" checked="checked"/> no
<input type="submit" value="ok"/>
</form></pre>
</body></html>
END_OF_HTML;
exit;
}
$application = 'bash';
$applications = array_merge($commands,array());
$applications[] = 'bash';
$applications[] = 'command';
if (isset($_GET['application'])) $application = $_GET['application'];
if (in_array($application,$applications)) call_user_func($application);