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|
<?php // -*- coding: utf-8 -*-
define('PHPSHELL_VERSION', '2.2');
/*
**************************************************************
* PHP Shell *
**************************************************************
PHP Shell is an interactive PHP script that will execute any command
entered. See the files README, INSTALL, and SECURITY or
http://phpshell.sourceforge.net/ for further information.
Copyright (C) 2000-2010 the Phpshell-team
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
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 can get a copy of the GNU General Public License from this
address: http://www.gnu.org/copyleft/gpl.html#SEC1
You can also write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* There are no user-configurable settings in this file anymore, please see
* config.php instead. */
header("Content-Type: text/html; charset=utf-8");
/* This error handler will turn all notices, warnings, and errors into fatal
* errors, unless they have been suppressed with the @-operator. */
function error_handler($errno, $errstr, $errfile, $errline, $errcontext) {
/* The @-operator (used with chdir() below) temporarely makes
* error_reporting() return zero, and we don't want to die in that case.
* We do note the error in the output, though. */
if (error_reporting() == 0) {
$_SESSION['output'] .= $errstr . "\n";
} else {
die('<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>PHP Shell ' . PHPSHELL_VERSION . '</title>
<meta http-equiv="Content-Script-Type" content="text/javascript">
<meta http-equiv="Content-Style-Type" content="text/css">
<meta name="generator" content="phpshell">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body>
<h1>Fatal Error!</h1>
<p><b>' . $errstr . '</b></p>
<p>in <b>' . $errfile . '</b>, line <b>' . $errline . '</b>.</p>
<hr>
<p>Please consult the <a href="README">README</a>, <a
href="INSTALL">INSTALL</a>, and <a href="SECURITY">SECURITY</a> files for
instruction on how to use PHP Shell.</p>
<hr>
<address>
Copyright © 2000–2010, the Phpshell-team. Get the latest
version at <a
href="http://phpshell.sourceforge.net/">http://phpshell.sourceforge.net/</a>.
</address>
</body>
</html>');
}
}
/* Installing our error handler makes PHP die on even the slightest problem.
* This is what we want in a security critical application like this. */
set_error_handler('error_handler');
function logout() {
/* Empty the session data, except for the 'authenticated' entry which the
* rest of the code needs to be able to check. */
$_SESSION = array('authenticated' => false);
/* Unset the client's cookie, if it has one. */
// if (isset($_COOKIE[session_name()]))
// setcookie(session_name(), '', time()-42000, '/');
/* Destroy the session data on the server. This prevents the simple
* replay attach where one uses the back button to re-authenticate using
* the old POST data since the server wont know the session then.*/
// session_destroy();
}
/* Clear history */
function clear()
{
$_SESSION['output'] = '';
}
function stripslashes_deep($value) {
if (is_array($value))
return array_map('stripslashes_deep', $value);
else
return stripslashes($value);
}
if (get_magic_quotes_gpc())
$_POST = stripslashes_deep($_POST);
/* Initialize some variables we need again and again. */
$username = isset($_POST['username']) ? $_POST['username'] : '';
$password = isset($_POST['password']) ? $_POST['password'] : '';
$nounce = isset($_POST['nounce']) ? $_POST['nounce'] : '';
$command = isset($_POST['command']) ? $_POST['command'] : '';
$rows = isset($_POST['rows']) ? $_POST['rows'] : 24;
$columns = isset($_POST['columns']) ? $_POST['columns'] : 80;
/* Load the configuration. */
$ini = parse_ini_file('config.php', true);
if (empty($ini['settings']))
$ini['settings'] = array();
/* Default settings --- these settings should always be set to something. */
$default_settings = array('home-directory' => '.');
$showeditor = false;
/* Merge settings. */
$ini['settings'] = array_merge($default_settings, $ini['settings']);
session_start();
/* Delete the session data if the user requested a logout. This leaves the
* session cookie at the user, but this is not important since we
* authenticates on $_SESSION['authenticated']. */
if (isset($_POST['logout']))
logout();
/* Delete history if submitted */
if (isset($_POST['clear']))
clear();
/* Attempt authentication. */
if (isset($_SESSION['nounce']) && $nounce == $_SESSION['nounce'] &&
isset($ini['users'][$username])) {
if (strchr($ini['users'][$username], ':') === false) {
// No seperator found, assume this is a password in clear text.
$_SESSION['authenticated'] = ($ini['users'][$username] == $password);
} else {
list($fkt, $salt, $hash) = explode(':', $ini['users'][$username]);
$_SESSION['authenticated'] = ($fkt($salt . $password) == $hash);
}
}
/* Enforce default non-authenticated state if the above code didn't set it
* already. */
if (!isset($_SESSION['authenticated']))
$_SESSION['authenticated'] = false;
if ($_SESSION['authenticated']) {
/* Initialize the session variables. */
if (empty($_SESSION['cwd'])) {
$_SESSION['cwd'] = realpath($ini['settings']['home-directory']);
$_SESSION['history'] = array();
$_SESSION['output'] = '';
}
/* Clicked on one of the directory links in the working directory - ignore the command */
if (isset($_POST['levelup'])) {
$levelup = $_POST['levelup'] ;
while ($levelup > 0) {
$command = '' ; /* ignore the command */
$_SESSION['cwd'] = dirname($_SESSION['cwd']) ;
$levelup -- ;
}
}
/* Selected a new subdirectory as working directory - ignore the command */
if (isset($_POST['changedirectory'])) {
$changedir= $_POST['changedirectory'];
if (strlen($changedir) > 0) {
if (@chdir($_SESSION['cwd'] . '/' . $changedir)) {
$command = '' ; /* ignore the command */
$_SESSION['cwd'] = realpath($_SESSION['cwd'] . '/' . $changedir) ;
}
}
}
/* Save content from 'editor' */
if(isset($_POST["filetoedit"]) && ($_POST["filetoedit"] != "")) {
$filetoedit_handle = fopen($_POST["filetoedit"], "w");
fputs($filetoedit_handle, str_replace("%0D%0D%0A", "%0D%0A", $_POST["filecontent"]));
fclose($filetoedit_handle);
}
if (!empty($command)) {
/* Save the command for late use in the JavaScript. If the command is
* already in the history, then the old entry is removed before the
* new entry is put into the list at the front. */
if (($i = array_search($command, $_SESSION['history'])) !== false)
unset($_SESSION['history'][$i]);
array_unshift($_SESSION['history'], $command);
/* Now append the commmand to the output. */
$_SESSION['output'] .= '$ ' . $command . "\n";
/* Initialize the current working directory. */
if (preg_match('/^[[:blank:]]*cd[[:blank:]]*$/', $command)) {
$_SESSION['cwd'] = realpath($ini['settings']['home-directory']);
} elseif (preg_match('/^[[:blank:]]*cd[[:blank:]]+([^;]+)$/', $command, $regs)) {
/* The current command is a 'cd' command which we have to handle
* as an internal shell command. */
/* if the directory starts and ends with quotes ("), remove them -
allows command like 'cd "abc def"' */
if ((substr($regs[1],0,1) == '"') && (substr($regs[1],-1) =='"') ) {
$regs[1] = substr($regs[1],1) ;
$regs[1] = substr($regs[1],0,-1) ;
}
if ($regs[1]{0} == '/') {
/* Absolute path, we use it unchanged. */
$new_dir = $regs[1];
} else {
/* Relative path, we append it to the current working
* directory. */
$new_dir = $_SESSION['cwd'] . '/' . $regs[1];
}
/* Transform '/./' into '/' */
while (strpos($new_dir, '/./') !== false)
$new_dir = str_replace('/./', '/', $new_dir);
/* Transform '//' into '/' */
while (strpos($new_dir, '//') !== false)
$new_dir = str_replace('//', '/', $new_dir);
/* Transform 'x/..' into '' */
while (preg_match('|/\.\.(?!\.)|', $new_dir))
$new_dir = preg_replace('|/?[^/]+/\.\.(?!\.)|', '', $new_dir);
if ($new_dir == '') $new_dir = '/';
/* Try to change directory. */
if (@chdir($new_dir)) {
$_SESSION['cwd'] = $new_dir;
} else {
$_SESSION['output'] .= "cd: could not change to: $new_dir\n";
}
} elseif (preg_match('/^[[:blank:]]*editor[[:blank:]]*$/', $command)) {
/* You called 'editor' without a filename so you get an short help
* on how to use the internal 'editor' command */
$_SESSION['output'] .= " Syntax: editor filename\n (you forgot the filename)\n";
} elseif (preg_match('/^[[:blank:]]*editor[[:blank:]]+([^;]+)$/', $command, $regs)) {
/* This is a tiny editor which you can start with 'editor filename' */
$filetoedit = $regs[1];
if ($regs[1]{0} != '/') {
/* relative path, add it to the current working directory.*/
$filetoedit = $_SESSION['cwd'].'/'.$regs[1];
} ;
if(is_file(realpath($filetoedit)) || ! file_exists($filetoedit)) {
$showeditor = true;
if(file_exists(realpath($filetoedit)))
$filetoedit = realpath($filetoedit);
} else {
$_SESSION['output'] .= " Syntax: editor filename\n (just regular or not existing files)\n";
}
} elseif (trim($command) == 'exit') {
logout();
} elseif (trim($command) == 'logout') {
logout();
} else {
/* The command is not an internal command, so we execute it after
* changing the directory and save the output. */
chdir($_SESSION['cwd']);
// We canot use putenv() in safe mode.
if (!ini_get('safe_mode')) {
// Advice programs (ls for example) of the terminal size.
putenv('ROWS=' . $rows);
putenv('COLUMNS=' . $columns);
}
/* Alias expansion. */
$length = strcspn($command, " \t");
$token = substr($command, 0, $length);
if (isset($ini['aliases'][$token]))
$command = $ini['aliases'][$token] . substr($command, $length);
$io = array();
$p = proc_open($command,
array(1 => array('pipe', 'w'),
2 => array('pipe', 'w')),
$io);
/* Read output sent to stdout. */
while (!feof($io[1])) {
$_SESSION['output'] .= htmlspecialchars(fgets($io[1]),
ENT_COMPAT, 'UTF-8');
}
/* Read output sent to stderr. */
while (!feof($io[2])) {
$_SESSION['output'] .= htmlspecialchars(fgets($io[2]),
ENT_COMPAT, 'UTF-8');
}
fclose($io[1]);
fclose($io[2]);
proc_close($p);
}
}
/* Build the command history for use in the JavaScript */
if (empty($_SESSION['history'])) {
$js_command_hist = '""';
} else {
$escaped = array_map('addslashes', $_SESSION['history']);
$js_command_hist = '"", "' . implode('", "', $escaped) . '"';
}
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>PHP Shell <?php echo PHPSHELL_VERSION ?></title>
<meta http-equiv="Content-Script-Type" content="text/javascript">
<meta http-equiv="Content-Style-Type" content="text/css">
<meta name="generator" content="phpshell">
<link rel="stylesheet" href="style.css" type="text/css">
<script type="text/javascript">
<?php if ($_SESSION['authenticated'] && ! $showeditor) { ?>
var current_line = 0;
var command_hist = new Array(<?php echo $js_command_hist ?>);
var last = 0;
function key(e) {
if (!e) var e = window.event;
if (e.keyCode == 38 && current_line < command_hist.length-1) {
command_hist[current_line] = document.shell.command.value;
current_line++;
document.shell.command.value = command_hist[current_line];
}
if (e.keyCode == 40 && current_line > 0) {
command_hist[current_line] = document.shell.command.value;
current_line--;
document.shell.command.value = command_hist[current_line];
}
}
function init() {
document.shell.setAttribute("autocomplete", "off");
document.shell.output.scrollTop = document.shell.output.scrollHeight;
document.shell.command.focus()
}
<?php } elseif($_SESSION['authenticated'] && $showeditor) { ?>
function init() {
document.shell.filecontent.focus();
}
<?php } else { ?>
function init() {
document.shell.username.focus();
}
<?php } ?>
function levelup(d) {
document.shell.levelup.value=d ;
document.shell.submit() ;
}
function changesubdir(d) {
document.shell.changedirectory.value=document.shell.dirselected.value ;
document.shell.submit() ;
}
</script>
</head>
<body onload="init()">
<h1>PHP Shell <?php echo PHPSHELL_VERSION ?></h1>
<form name="shell" action="<?php print($_SERVER['PHP_SELF']) ?>" method="post">
<div><input name="levelup" id="levelup" type="hidden"></div>
<div><input name="changedirectory" id="changedirectory" type="hidden"></div>
<?php
if (!$_SESSION['authenticated']) {
/* Genereate a new nounce every time we preent the login page. This binds
* each login to a unique hit on the server and prevents the simple replay
* attack where one uses the back button in the browser to replay the POST
* data from a login. */
$_SESSION['nounce'] = mt_rand();
?>
<fieldset>
<legend>Authentication</legend>
<?php
if (!empty($username))
echo " <p class=\"error\">Login failed, please try again:</p>\n";
else
echo " <p>Please login:</p>\n";
?>
<label for="username">Username:</label>
<input name="username" id="username" type="text" value="<?php echo $username
?>"><br>
<label for="password">Password:</label>
<input name="password" id="password" type="password">
<p><input type="submit" value="Login"></p>
<input name="nounce" type="hidden" value="<?php echo $_SESSION['nounce']; ?>">
</fieldset>
<?php } else { /* Authenticated. */ ?>
<fieldset>
<legend><?php echo "Phpshell running on: " . $_SERVER['SERVER_NAME']; ?></legend>
<p>Current Working Directory:
<span class="pwd"><?php
if( $showeditor ) {
echo htmlspecialchars($_SESSION['cwd'], ENT_COMPAT, 'UTF-8') . '</span>';
} else { /* normal mode - offer navigation via hyperlinks */
$parts = explode('/', $_SESSION['cwd']);
for($i=1; $i<count($parts); $i=$i+1) {
echo '<a class="pwd" title="Change to this directory. Your command will not be executed." href="javascript:levelup(' . (count($parts)-$i) . ')">/</a>' ;
echo htmlspecialchars($parts[$i], ENT_COMPAT, 'UTF-8') ;
}
echo '</span>';
/* Now we make a list of the directories. */
$dir_handle = opendir($_SESSION['cwd']);
/* We store the output so that we can sort it later: */
$options = array();
/* Run through all the files and directories to find the dirs. */
while ($dir = readdir($dir_handle)) {
if (($dir != '.') and ($dir != '..') and is_dir($_SESSION['cwd'] . "/" . $dir)) {
$options[$dir] = "<option value=\"/$dir\">$dir</option>";
}
}
closedir($dir_handle);
if (count($options)>0) {
ksort($options);
echo '<br><a href="javascript:changesubdir()">Change to subdirectory</a>: <select name="dirselected">';
echo implode("\n", $options);
echo '</select>';
}
}
?>
<br>
<?php if(! $showeditor) { /* Outputs the 'terminal' without the editor */ ?>
<div id="terminal">
<textarea name="output" readonly="readonly" cols="<?php echo $columns ?>" rows="<?php echo $rows ?>">
<?php
$lines = substr_count($_SESSION['output'], "\n");
$padding = str_repeat("\n", max(0, $rows+1 - $lines));
echo rtrim($padding . $_SESSION['output']);
?>
</textarea>
<p id="prompt">
$ <input name="command" type="text"
onkeyup="key(event)" size="<?php echo $columns-2 ?>" tabindex="1">
</p>
</div>
<?php } else { /* Output the 'editor' */ ?>
<?php print("You are editing this file: ".$filetoedit); ?>
<div id="terminal">
<textarea name="filecontent" cols="<?php echo $columns ?>" rows="<?php echo $rows ?>">
<?php
if(file_exists($filetoedit)) {
print(htmlspecialchars(str_replace("%0D%0D%0A", "%0D%0A", file_get_contents($filetoedit))));
}
?>
</textarea>
</div>
<?php } /* End of terminal */ ?>
<p>
<?php if(! $showeditor) { /* You can not resize the textarea while
* the editor is 'running', because if you would
* do so you would lose the changes you have
* already made in the textarea since last saving */
?>
<span style="float: right">Size: <input type="text" name="rows" size="2"
maxlength="3" value="<?php echo $rows ?>"> × <input type="text"
name="columns" size="2" maxlength="3" value="<?php echo $columns
?>"></span>
<?php } ?>
<?php if(! $showeditor) { /* for normal 'non-editor-mode' */ ?>
<input type="submit" value="Execute Command">
<input type="submit" name="clear" value="Clear">
<?php } else { /* for 'editor-mode' */ ?>
<input type="hidden" name="filetoedit" id="filetoedit" value="<?php print($filetoedit) ?>">
<input type="submit" value="Save and Exit">
<input type="reset" value="Undo all Changes">
<input type="submit" value="Exit without saving" onclick="javascript:document.getElementById('filetoedit').value='';return true;">
<?php } ?>
<input type="submit" name="logout" value="Logout">
</p>
</fieldset>
<?php } ?>
</form>
<hr>
<p>Please consult the <a href="README">README</a>, <a
href="INSTALL">INSTALL</a>, and <a href="SECURITY">SECURITY</a> files for
instruction on how to use PHP Shell.</p>
<p>If you have not created accounts for phpshell, please use <a href="pwhash.php">pwhash.php</a> to create secure passwords.</p>
<hr>
<address>
Copyright © 2000–2010, the Phpshell-team. Get the
latest version at <a
href="http://phpshell.sourceforge.net/">http://phpshell.sourceforge.net/</a>.
</address>
</body>
</html>
|
