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<?php
/**
* The plugin provides two services:
* <ul>
* <li>IP address filtering</li>
* <li>Detection of <i>password probing</i> attempts
* </ul>
*
* <b>IP address filtering:</b>
*
* Allows/Denies access to the gallery to specified IP address ranges
* Detects repeated failed login attempts and blocks access to the IP address used
* in these attempts.
*
* This does not block access to validated users, only anonymous visitors. But
* a user will have to log on via the admin pages if out of the IP ranges as
* he will get a Forbidden error on any front-end page including a logon form
*
* <b>Password probing:</b>
*
* Hackers often use <i>probing</i> or <i>password guessing</i> to attempt to breach your site
* This plugin can help to throttle these attacks. It works by monitoring failed logon attempts.
* If a defined threashold is exceeded by requests from a particular IP
* address, further access attempts from that IP accress will be ignored until a timeout has expired.
* @author Stephen Billard (sbillard)
* @package plugins
* @subpackage admin
*/
$plugin_is_filter = 8|CLASS_PLUGIN;
$plugin_description = gettext("Tools to block hacker access to your site.");
$plugin_author = "Stephen Billard (sbillard)";
$option_interface = 'ipBlocker';
zp_register_filter('load_theme_script', 'ipBlocker::load');
zp_register_filter('admin_allow_access', 'ipBlocker::adminGate');
zp_register_filter('admin_login_attempt', 'ipBlocker::login');
zp_register_filter('federated_login_attempt', 'ipBlocker::login');
zp_register_filter('guest_login_attempt', 'ipBlocker::login');
/**
* Option handler class
*
*/
class ipBlocker {
/**
* class instantiation function
*
* @return security_logger
*/
function __construct() {
setOptionDefault('ipBlocker_list', serialize(array()));
setOptionDefault('ipBlocker_type', 'block');
setOptionDefault('ipBlocker_threshold', 10);
setOptionDefault('ipBlocker_timeout', 60);
}
/**
* Reports the supported options
*
* @return array
*/
function getOptionsSupported() {
$buttons = array( gettext('Allow')=>'allow',gettext('Block')=>'block');
$text = array_flip($buttons);
$cwd = getcwd();
chdir(SERVERPATH.'/'.UPLOAD_FOLDER);
$list = safe_glob('*.txt');
chdir($cwd);
$files = array(''=>'');
foreach ($list as $file) {
$files[$file] = $file;
}
$options = array( gettext('IP list') => array('key' => 'ipBlocker_IP', 'type' => OPTION_TYPE_CUSTOM,
'order'=>4,
'desc' => sprintf(gettext('List of IP ranges to %s.'), $text[getOption('ipBlocker_type')])),
gettext('Import list') => array('key' => 'ipBlocker_import', 'type' => OPTION_TYPE_SELECTOR,
'order' => 5,
'selections' => $files,
'nullselection' => '',
'disabled' => !extensionEnabled('ipBlocker'),
'desc' => sprintf(gettext('Import an external IP list. <p class="notebox"><strong>NOTE:</strong> If this list is large it may exceed the capacity of Zenphoto and %s to process and store the results.'),DATABASE_SOFTWARE)),
gettext('Action') =>array('key' => 'ipBlocker_type', 'type' => OPTION_TYPE_RADIO,
'order'=>3,
'buttons'=>$buttons,
'desc' => gettext('How the plugin will interpret the IP list.')),
gettext('Logon threshold') => array('key' => 'ipBlocker_threshold', 'type' => OPTION_TYPE_TEXTBOX,
'order'=>1,
'desc' => gettext('Admin page requests will be ignored after this many failed tries.')),
gettext('Logon cool off') =>array('key' => 'ipBlocker_timeout', 'type' => OPTION_TYPE_TEXTBOX,
'order'=>2,
'desc' => gettext('The block will be removed after this many minutes.'))
);
if (!extensionEnabled('ipBlocker')) {
$options['note'] = array('key'=>'ipBlocker_note', 'type'=>OPTION_TYPE_NOTE,
'order'=>0,
'desc'=>'<p class="notebox">'.gettext('IP list ranges cannot be managed with the plugin disabled').'</p>');
}
return $options;
}
function handleOption($option, $currentValue) {
$list = unserialize(getOption('ipBlocker_list'));
if (extensionEnabled('ipBlocker')) {
$disabled = '';
} else {
$disabled = ' disabled="disabled"';
}
switch($option) {
case 'ipBlocker_IP':
$key = 0;
foreach ($list as $key=>$range) {
?>
<input id="ipholder_<?php echo $key; ?>a" type="textbox" size="20" name="ipBlocker_ip_start_<?php echo $key; ?>"
value="<?php echo html_encode($range['start']); ?>" <?php echo $disabled; ?> />
-
<input id="ipholder_<?php echo $key; ?>b" type="textbox" size="20" name="ipBlocker_ip_end_<?php echo $key; ?>"
value="<?php echo html_encode($range['end']); ?>" <?php echo $disabled; ?> />
<br />
<?php
}
$i = $key;
while ($i < $key+4) {
$i++;
?>
<input id="ipholder_<?php echo $i; ?>a" type="textbox" size="20" name="ipBlocker_ip_start_<?php echo $i; ?>"
value="" <?php echo $disabled; ?> />
-
<input id="ipholder_<?php echo $i; ?>b" type="textbox" size="20" name="ipBlocker_ip_end_<?php echo $i; ?>"
value="" <?php echo $disabled; ?> />
<br />
<?php
}
?>
<script type="text/javascript">
<!--
function clearips() {
<?php
for ($i=0;$i<=$key+4;$i++) {
?>
$('#ipholder_<?php echo $i; ?>a').val('');
$('#ipholder_<?php echo $i; ?>b').val('');
<?php
}
?>
}
//-->
</script>
<p class="buttons">
<a href="javascript:clearips();"><?php echo gettext('clear list'); ?></a>
</p>
<?php
break;
}
}
static function handleOptionSave($themename,$themealbum) {
$notify = '';
$list = array();
foreach ($_POST as $key=>$param) {
if ($param) {
if (strpos($key, 'ipBlocker_ip_') !== false) {
if (preg_match( "/^(([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]).){3}([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$/", $param)){
$p = explode('_', substr($key,13));
$list[$p[1]][$p[0]] = $param;
}
}
}
}
foreach ($list as $key=>$range) {
if (!array_key_exists('start', $range) || !array_key_exists('end', $range)) {
unset($list[$key]);
$notify .= gettext('IP address format error').'<br />';
}
}
setOption('ipBlocker_list', serialize($list));
purgeOption('ipBlocker_import');
if (!empty($_POST['ipBlocker_import'])) {
$file = SERVERPATH.'/'.UPLOAD_FOLDER.'/'.sanitize_path($_POST['ipBlocker_import']);
if (file_exists($file)) {
$import_list = array();
// insert current list into import list for posterity
foreach ($list as $range) {
$ipa = explode('.',$range['end']);
$ipend = sprintf('%03u.%03u.%03u.%03u',@$ipa[0],@$ipa[1],@$ipa[2],@$ipa[3]);
$ipa = explode('.',$range['start']);
do {
$current = sprintf('%03u.%03u.%03u.%03u',@$ipa[0],@$ipa[1],@$ipa[2],@$ipa[3]);
$ipa[3]++;
if ($ipa[3]>255) {
$ipa[3] = 0;
$ipa[2]++;
if ($ipa[2]>255) {
$ipa[2] = 0;
$ipa[2]++;
if ($ipa[1]>255) {
$ipa[1] = 0;
$ipa[0]++;
if ($ipa[0]>255) {
break;
}
}
}
}
$import_list[] = $current;
} while ($current < $ipend);
}
$import = explode("\n", file_get_contents($file));
foreach ($import as $ip) {
$ip = trim($ip);
if ($ip) {
$ipa = explode('.', $ip);
$import_list[] = sprintf('%03u.%03u.%03u.%03u',@$ipa[0],@$ipa[1],@$ipa[2],@$ipa[3]);
}
}
$list = array();
if (!empty($import_list)) {
$import_list = array_unique($import_list); // remove duplicates
sort($import_list);
//now make a range pair list for the storage.
$current = $start = array_shift($import_list);
$end = $start;
$clean = false;
while (!empty($import_list)) {
$try = trim(array_shift($import_list));
if ($try) { // ignore empty lines
$ipa = explode('.',$current);
$ipa[3]++;
if ($ipa[3]>255) {
$ipa[3] = 0;
$ipa[2]++;
if ($ipa[2]>255) {
$ipa[2] = 0;
$ipa[2]++;
if ($ipa[1]>255) {
$ipa[1] = 0;
$ipa[0]++;
if ($ipa[0]>255) {
break;
}
}
}
}
$next = sprintf('%03u.%03u.%03u.%03u',@$ipa[0],@$ipa[1],@$ipa[2],@$ipa[3]);
$current = $try;
if ($clean = $current != $next) {
$list[] = array('start'=> $start,'end'=>$end);
$start = $end = $current;
} else {
$end = $next;
}
}
}
if (!$clean) {
$list[] = array('start'=> $start,'end'=>$end);
}
setOption('ipBlocker_list', serialize($list));
}
}
}
return $notify;
}
/**
* Monitors Login attempts
* @param bit $loggedin will be "false" if the login failed
* @param string $user ignored
* @param string $pass ignored
*/
static function login($loggedin, $user, $pass) {
if (!$loggedin) {
self::adminGate('', '');
}
return $loggedin;
}
static function suspended() {
if ($block = getOption('ipBlocker_forbidden')) {
$block = unserialize($block);
if (array_key_exists($ip = getUserIP(),$block)) {
if ($block[$ip] < (time()-getOption('ipBlocker_timeout')*60)) {
// cooloff period passed
unset($block[$ip]);
if (count($block) > 0) {
setOption('ipBlocker_forbidden', serialize($block));
} else {
setOption('ipBlocker_forbidden',NULL);
}
} else {
return true;
}
}
}
return false;
}
/**
* Monitors blocked accesses to Admin pages
* @param bool $allow ignored
* @param string $page ignored
*/
static function adminGate($allow, $page) {
// clean out expired attempts
$sql = 'DELETE FROM '.prefix('plugin_storage').' WHERE `type`="ipBlocker" AND `aux` < "'.(time()-getOption('ipBlocker_timeout')*60).'"';
query($sql);
// add this attempt
$sql = 'INSERT INTO '.prefix('plugin_storage').' (`type`, `aux`,`data`) VALUES ("ipBlocker", "'.time().'","'.getUserIP().'")';
query($sql);
// check how many times this has happened recently
$count = db_count('plugin_storage','WHERE `type`="ipBlocker" AND `data`="'.getUserIP().'"');
if ($count >= getOption('ipBlocker_threshold')) {
$block = getOption('ipBlocker_forbidden');
if ($block) {
$block = unserialize($block);
} else {
$block = array();
}
$block[getUserIP()] = time();
setOption('ipBlocker_forbidden',serialize($block));
}
return $allow;
}
/**
*
* Monitors front end access and excludes access as defined by the options
* @param string $path
* @return string
*/
static function load($path) {
$list = unserialize(getOption('ipBlocker_list'));
$allow = getOption('ipBlocker_type') == 'allow';
$gate = $allow;
if (!empty($list)) {
$ipa = explode('.',getUserIP());
$ip = sprintf('%03u.%03u.%03u.%03u',@$ipa[0],@$ipa[1],@$ipa[2],@$ipa[3]);
foreach ($list as $range) {
if ($ip>=$range['start'] && $ip<=$range['end']) {
$gate = !$allow;
break;
}
}
}
if ($gate) {
header("HTTP/1.0 403 ".gettext("Forbidden"));
header("Status: 403 ".gettext("Forbidden"));
exitZP(); // terminate the script with no output
} else {
return $path;
}
}
}
if (ipBlocker::suspended()) {
header("HTTP/1.0 403 ".gettext("Forbidden"));
header("Status: 403 ".gettext("Forbidden"));
exitZP(); // terminate the script with no output
}
?>
|