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/*

**************************************************************
* PHP Shell 2.1 *
**************************************************************

PHP Shell is an interactive PHP script that will execute any command
entered. See the files README, INSTALL, and SECURITY or
http://mgeisler.net/php-shell/ for further information.

Copyright (C) 2000-2005 Martin Geisler

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. */


/* 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 @-opertor (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(' "http://www.w3.org/TR/html4/strict.dtd">

Fatal Error!

' . $errstr . '

in ' . $errfile . ', line ' . $errline . '.

---

Please consult the README, href="INSTALL">INSTALL, and SECURITY files for
instruction on how to use PHP Shell.

---

Copyright © 2000–2005, href="mailto:mgeisler@mgeisler.net">Martin Geisler. Get the latest
version at href="http://mgeisler.net/php-shell/">mgeisler.net/php-shell/.

');
}
}

/* 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();
}


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' => '.');

/* 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();

/* 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'] = '';
}

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 (ereg('^[[:blank:]]*cd[[:blank:]]*$', $command)) {
$_SESSION['cwd'] = realpath($ini['settings']['home-directory']);
} elseif (ereg('^[[:blank:]]*cd[[:blank:]]+([^;]+)$', $command, $regs)) {
/* The current command is a 'cd' command which we have to handle
* as an internal shell command. */

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 (trim($command) == 'exit') {
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) . '"';
}
}

?>
"http://www.w3.org/TR/html4/strict.dtd">








var current_line = 0;
var command_hist = new Array();
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();
}



function init() {
document.shell.username.focus();
}

PHP Shell 2.1

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();

?>

Authentication

if (!empty($username))
echo '

Login failed, please try again:

' . "\n";
else
echo "

Please login:

\n";
?>

Username:

Password:

Current Working Directory: echo htmlspecialchars($_SESSION['cwd'], ENT_COMPAT, 'UTF-8');
?>

<br /><?php<br />$lines = substr_count($_SESSION['output'], "\n");<br />$padding = str_repeat("\n", max(0, $rows+1 - $lines));<br />echo rtrim($padding . $_SESSION['output']);<br />?><br />

$  onkeyup="key(event)" size="" tabindex="1">

Size: maxlength="3" value=""> × name="columns" size="2" maxlength="3" value=" ?>">

---

Please consult the README, href="INSTALL">INSTALL, and SECURITY files for
instruction on how to use PHP Shell.

---

Copyright © 2000–2005, href="mailto:mgeisler@mgeisler.net">Martin Geisler. Get the
latest version at href="http://mgeisler.net/php-shell/">mgeisler.net/php-shell/.

INSTALL file for PHP Shell 2.1
Copyright (C) 2000-2005 Martin Geisler
Licensed under the GNU GPL. See the file COPYING for details.


Downloading PHP Shell
=====================

You can always get the latest version of PHP Shell from my homepage:

http://mgeisler.net/php-shell/



Installation
============

Installation is easy: first unpack the tarball or zipfile downloaded from the
above website into your webserver. This will create a subdirectory called
phpweather-2.1 for PHP Shell version 2.1.

Try loading the file ``phpshell.php`` in your browser and check that you are
served a page that asks you to authenticate yourself with a username and a
password. If you do not see such a page, then please check that you have
entered the URL correctly and that PHP is working on your server.



Configuration
=============

All configuration happens in the ``config.php`` file. This is an ini-file
dispite its name. Ini-files consist of a number of sections, each containing
a number of 'key = "value"' pairs. PHP Shell has tree sections: '[users]' for
configuring usernames and passwords, '[aliases]' for configuring shell
aliases, and '[settings]' for general settings.


Setting Usernames and Passwords
-------------------------------

As a security precaution PHP Shell has no default username and password
(people often forget to change them...). To add the user "alice" with
password "secret" you simply add

[users]
alice = "secret"

to the file. Note that you can add as many users as you want by simply adding
more lines like this.

This system works, but there is a better way --- a way so that the password
does not appear in clear text in the file. For that you use the supplied
script ``pwhash.php`` to generate a hashed password. Please see the
instructions given in ``pwhash.php``.

With the above example the result could look like

[users]
alice = "md5:7ea3b59e:eb271c4459253eaa163fcac2a119f225"

You will not get exactly the same line if you try it out, this is a feature of
the system which means that both "alice" and "bob" could have "secret" as
their password, and you would not be able to tell from just looking at
``config.php``.


Shell Aliases
-------------

As in a normal shell, PHP Shell supports alias expansion, albeit in a simple
form. Aliases are defined by 'key = "value"' pairs in the '[aliases]'
section. The "key" will be matched against the first token of the command
line and substituted with the "value" given.

Two convenient aliases are already defined:

[aliases]
ls = "ls -CvhF"
ll = "ls -lvhF"


General Settings
----------------

PHP has just one other setting right now --- the home directory. Change this
in the '[settings]' section.



Bugs? Comments?
================

If you find a bug or miss something in PHP Shell, please don't hesitate to
mail me at ! Or you could drop by and leave a comment
at http://mgeisler.net/php-shell/.

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