gnu-social/plugins/RegisterThrottle/RegisterThrottlePlugin.php

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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* Throttle registration by IP address
*
* PHP version 5
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Spam
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
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if (!defined('GNUSOCIAL')) { exit(1); }
/**
* Throttle registration by IP address
*
* We a) record IP address of registrants and b) throttle registrations.
*
* @category Spam
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
class RegisterThrottlePlugin extends Plugin
{
const PLUGIN_VERSION = '2.0.0';
/**
* Array of time spans in seconds to limits.
*
* Default is 3 registrations per hour, 5 per day, 10 per week.
*/
public $regLimits = array(604800 => 10, // per week
86400 => 5, // per day
3600 => 3); // per hour
/**
* Disallow registration if a silenced user has registered from
* this IP address.
*/
public $silenced = true;
/**
* Auto-silence all other users from the same registration_ip
* as the one being silenced. Caution: Many users may come from
* the same IP (even entire countries) without having any sort
* of relevant connection for moderation.
*/
public $auto_silence_by_ip = false;
/**
* Whether we're enabled; prevents recursion.
*/
static private $enabled = true;
/**
* Database schema setup
*
* We store user registrations in a table registration_ip.
*
* @return boolean hook value; true means continue processing, false means stop.
*/
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public function onCheckSchema()
{
$schema = Schema::get();
// For storing user-submitted flags on profiles
$schema->ensureTable('registration_ip', Registration_ip::schemaDef());
return true;
}
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public function onRouterInitialized(URLMapper $m)
{
$m->connect('main/ipregistrations/:ipaddress',
array('action' => 'ipregistrations'),
array('ipaddress' => '[0-9a-f\.\:]+'));
}
/**
* Called when someone tries to register.
*
* We check the IP here to determine if it goes over any of our
* configured limits.
*
* @param Action $action Action that is being executed
*
* @return boolean hook value
*/
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public function onStartRegistrationTry($action)
{
$ipaddress = $this->_getIpAddress();
if (empty($ipaddress)) {
// TRANS: Server exception thrown when no IP address can be found for a registation attempt.
throw new ServerException(_m('Cannot find IP address.'));
}
foreach ($this->regLimits as $seconds => $limit) {
$this->debug("Checking $seconds ($limit)");
$reg = $this->_getNthReg($ipaddress, $limit);
if (!empty($reg)) {
$this->debug("Got a {$limit}th registration.");
$regtime = strtotime($reg->created);
$now = time();
$this->debug("Comparing {$regtime} to {$now}");
if ($now - $regtime < $seconds) {
// TRANS: Exception thrown when too many user have registered from one IP address within a given time frame.
throw new Exception(_m('Too many registrations. Take a break and try again later.'));
}
}
}
// Check for silenced users
if ($this->silenced) {
$ids = Registration_ip::usersByIP($ipaddress);
foreach ($ids as $id) {
$profile = Profile::getKV('id', $id);
if ($profile && $profile->isSilenced()) {
// TRANS: Exception thrown when attempting to register from an IP address from which silenced users have registered.
throw new Exception(_m('A banned user has registered from this address.'));
}
}
}
return true;
}
function onEndShowSections(Action $action)
{
if (!$action instanceof ShowstreamAction) {
// early return for actions we're not interested in
return true;
}
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$target = $action->getTarget();
if (!$target->isSilenced()) {
// Only show the IP of users who are not silenced.
return true;
}
$scoped = $action->getScoped();
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if (!$scoped->hasRight(Right::SILENCEUSER)) {
// only show registration IP if we have the right to silence users
return true;
}
$ri = Registration_ip::getKV('user_id', $target->getID());
$ipaddress = null;
if ($ri instanceof Registration_ip) {
$ipaddress = $ri->ipaddress;
unset($ri);
}
$action->elementStart('div', array('id' => 'entity_mod_log',
'class' => 'section'));
$action->element('h2', null, _('Registration IP'));
// TRANS: Label for the information about which IP a users registered from.
$action->element('strong', null, _('Registered from:'));
$el = 'span';
$attrs = ['class'=>'ipaddress'];
if (!is_null($ipaddress)) {
$el = 'a';
$attrs['href'] = common_local_url('ipregistrations', array('ipaddress'=>$ipaddress));
}
$action->element($el, $attrs,
// TRANS: Unknown IP address.
$ipaddress ?: _('unknown'));
$action->elementEnd('div');
}
/**
* Called after someone registers, by any means.
*
* We record the successful registration and IP address.
*
* @param Profile $profile new user's profile
*
* @return boolean hook value
*/
public function onEndUserRegister(Profile $profile)
{
$ipaddress = $this->_getIpAddress();
if (empty($ipaddress)) {
// User registration can happen from command-line scripts etc.
return true;
}
$reg = new Registration_ip();
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$reg->user_id = $profile->getID();
$reg->ipaddress = mb_strtolower($ipaddress);
$reg->created = common_sql_now();
$result = $reg->insert();
if ($result === false) {
common_log_db_error($reg, 'INSERT', __FILE__);
// @todo throw an exception?
}
return true;
}
/**
* Check the version of the plugin.
*
* @param array &$versions Version array.
*
* @return boolean hook value
*/
public function onPluginVersion(array &$versions)
{
$versions[] = array('name' => 'RegisterThrottle',
'version' => self::PLUGIN_VERSION,
'author' => 'Evan Prodromou',
'homepage' => 'https://git.gnu.io/gnu/gnu-social/tree/master/plugins/RegisterThrottle',
'description' =>
// TRANS: Plugin description.
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_m('Throttles excessive registration from a single IP address.'));
return true;
}
/**
* Gets the current IP address.
*
* @return string IP address or null if not found.
*/
private function _getIpAddress()
{
$keys = array('HTTP_X_FORWARDED_FOR',
'HTTP_X_CLIENT',
'CLIENT-IP',
'REMOTE_ADDR');
foreach ($keys as $k) {
if (!empty($_SERVER[$k])) {
return $_SERVER[$k];
}
}
return null;
}
/**
* Gets the Nth registration with the given IP address.
*
* @param string $ipaddress Address to key on
* @param integer $n Nth address
*
* @return Registration_ip nth registration or null if not found.
*/
private function _getNthReg($ipaddress, $n)
{
$reg = new Registration_ip();
$reg->ipaddress = $ipaddress;
$reg->orderBy('created DESC');
$reg->limit($n - 1, 1);
if ($reg->find(true)) {
return $reg;
} else {
return null;
}
}
/**
* When silencing a user, silence all other users registered from that IP
* address.
*
* @param Profile $profile Person getting a new role
* @param string $role Role being assigned like 'moderator' or 'silenced'
*
* @return boolean hook value
*/
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public function onEndGrantRole($profile, $role)
{
if (!self::$enabled) {
return true;
}
if ($role !== Profile_role::SILENCED) {
return true;
}
if (!$this->auto_silence_by_ip) {
return true;
}
$ri = Registration_ip::getKV('user_id', $profile->getID());
if (empty($ri)) {
return true;
}
$ids = Registration_ip::usersByIP($ri->ipaddress);
foreach ($ids as $id) {
if ($id == $profile->getID()) {
continue;
}
try {
$other = Profile::getByID($id);
} catch (NoResultException $e) {
continue;
}
if ($other->isSilenced()) {
continue;
}
// 'enabled' here is used to prevent recursion, since
// we'll end up in this function again on ->silence()
// though I actually think it doesn't matter since we
// do this in onEndGrantRole and that means the above
// $other->isSilenced() test should've 'continue'd...
$old = self::$enabled;
self::$enabled = false;
$other->silence();
self::$enabled = $old;
}
}
}