288 lines
8.1 KiB
PHP
288 lines
8.1 KiB
PHP
<?php
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/**
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, StatusNet, Inc.
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*
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* Throttle registration by IP address
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*
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* PHP version 5
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Spam
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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if (!defined('GNUSOCIAL')) { exit(1); }
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/**
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* Throttle registration by IP address
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*
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* We a) record IP address of registrants and b) throttle registrations.
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*
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* @category Spam
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
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* @link http://status.net/
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*/
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class RegisterThrottlePlugin extends Plugin
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{
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/**
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* Array of time spans in seconds to limits.
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*
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* Default is 3 registrations per hour, 5 per day, 10 per week.
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*/
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public $regLimits = array(604800 => 10, // per week
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86400 => 5, // per day
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3600 => 3); // per hour
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/**
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* Disallow registration if a silenced user has registered from
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* this IP address.
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*/
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public $silenced = true;
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/**
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* Whether we're enabled; prevents recursion.
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*/
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static private $enabled = true;
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/**
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* Database schema setup
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*
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* We store user registrations in a table registration_ip.
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*
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* @return boolean hook value; true means continue processing, false means stop.
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*/
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public function onCheckSchema()
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{
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$schema = Schema::get();
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// For storing user-submitted flags on profiles
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$schema->ensureTable('registration_ip', Registration_ip::schemaDef());
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return true;
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}
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/**
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* Called when someone tries to register.
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*
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* We check the IP here to determine if it goes over any of our
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* configured limits.
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*
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* @param Action $action Action that is being executed
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*
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* @return boolean hook value
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*/
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public function onStartRegistrationTry($action)
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{
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$ipaddress = $this->_getIpAddress();
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if (empty($ipaddress)) {
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// TRANS: Server exception thrown when no IP address can be found for a registation attempt.
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throw new ServerException(_m('Cannot find IP address.'));
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}
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foreach ($this->regLimits as $seconds => $limit) {
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$this->debug("Checking $seconds ($limit)");
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$reg = $this->_getNthReg($ipaddress, $limit);
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if (!empty($reg)) {
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$this->debug("Got a {$limit}th registration.");
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$regtime = strtotime($reg->created);
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$now = time();
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$this->debug("Comparing {$regtime} to {$now}");
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if ($now - $regtime < $seconds) {
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// TRANS: Exception thrown when too many user have registered from one IP address within a given time frame.
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throw new Exception(_m('Too many registrations. Take a break and try again later.'));
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}
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}
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}
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// Check for silenced users
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if ($this->silenced) {
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$ids = Registration_ip::usersByIP($ipaddress);
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foreach ($ids as $id) {
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$profile = Profile::getKV('id', $id);
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if ($profile && $profile->isSilenced()) {
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// TRANS: Exception thrown when attempting to register from an IP address from which silenced users have registered.
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throw new Exception(_m('A banned user has registered from this address.'));
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}
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}
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}
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return true;
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}
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/**
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* Called after someone registers, by any means.
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*
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* We record the successful registration and IP address.
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*
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* @param Profile $profile new user's profile
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*
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* @return boolean hook value
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*/
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public function onEndUserRegister(Profile $profile)
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{
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$ipaddress = $this->_getIpAddress();
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if (empty($ipaddress)) {
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// User registration can happen from command-line scripts etc.
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return true;
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}
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$reg = new Registration_ip();
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$reg->user_id = $profile->id;
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$reg->ipaddress = $ipaddress;
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$reg->created = common_sql_now();
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$result = $reg->insert();
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if ($result === false) {
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common_log_db_error($reg, 'INSERT', __FILE__);
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// @todo throw an exception?
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}
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return true;
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}
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/**
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* Check the version of the plugin.
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*
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* @param array &$versions Version array.
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*
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* @return boolean hook value
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*/
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public function onPluginVersion(&$versions)
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{
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$versions[] = array('name' => 'RegisterThrottle',
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'version' => GNUSOCIAL_VERSION,
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'author' => 'Evan Prodromou',
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'homepage' => 'http://status.net/wiki/Plugin:RegisterThrottle',
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'description' =>
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// TRANS: Plugin description.
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_m('Throttles excessive registration from a single IP address.'));
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return true;
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}
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/**
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* Gets the current IP address.
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*
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* @return string IP address or null if not found.
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*/
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private function _getIpAddress()
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{
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$keys = array('HTTP_X_FORWARDED_FOR',
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'HTTP_X_CLIENT',
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'CLIENT-IP',
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'REMOTE_ADDR');
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foreach ($keys as $k) {
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if (!empty($_SERVER[$k])) {
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return $_SERVER[$k];
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}
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}
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return null;
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}
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/**
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* Gets the Nth registration with the given IP address.
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*
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* @param string $ipaddress Address to key on
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* @param integer $n Nth address
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*
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* @return Registration_ip nth registration or null if not found.
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*/
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private function _getNthReg($ipaddress, $n)
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{
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$reg = new Registration_ip();
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$reg->ipaddress = $ipaddress;
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$reg->orderBy('created DESC');
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$reg->limit($n - 1, 1);
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if ($reg->find(true)) {
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return $reg;
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} else {
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return null;
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}
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}
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/**
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* When silencing a user, silence all other users registered from that IP
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* address.
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*
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* @param Profile $profile Person getting a new role
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* @param string $role Role being assigned like 'moderator' or 'silenced'
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*
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* @return boolean hook value
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*/
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public function onEndGrantRole($profile, $role)
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{
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if (!self::$enabled) {
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return true;
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}
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if ($role != Profile_role::SILENCED) {
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return true;
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}
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if (!$this->silenced) {
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return true;
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}
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$ri = Registration_ip::getKV('user_id', $profile->id);
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if (empty($ri)) {
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return true;
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}
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$ids = Registration_ip::usersByIP($ri->ipaddress);
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foreach ($ids as $id) {
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if ($id == $profile->id) {
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continue;
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}
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$other = Profile::getKV('id', $id);
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if (empty($other)) {
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continue;
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}
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if ($other->isSilenced()) {
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continue;
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}
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$old = self::$enabled;
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self::$enabled = false;
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$other->silence();
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self::$enabled = $old;
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}
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}
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}
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