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unify IP-related logic into traffic limiter

This commit is contained in:
El RIDO 2022-02-20 11:25:19 +01:00
parent dbe8debe30
commit 1034d4038e
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GPG Key ID: 0F5C940A6BD81F92
3 changed files with 101 additions and 60 deletions
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29
lib/Controller.php
View File

@ -195,35 +195,14 @@ class Controller
*/
private function _create()
{
// Check if whitelist feature is enabled
if (($option = $this->_conf->getKey('creators', 'traffic')) !== '') {
// Parse whitelist into array
$whitelist = explode(',', $option);
// Check for source IP in HTTP header
if (($option = $this->_conf->getKey('header', 'traffic')) !== null) {
$httpHeader = 'HTTP_' . $option;
// Grab source IP from HTTP header (if it exists)
if (array_key_exists($httpHeader, $_SERVER) && !empty($_SERVER[$httpHeader])) {
// Check if source IP reported from HTTP header is in whitelist array
if (!in_array($_SERVER[$httpHeader], $whitelist)) {
$this->_return_message(1, I18n::_('Your IP is not authorized to create pastes.'));
return;
}
}
}
}
// Ensure last paste from visitors IP address was more than configured amount of seconds ago.
ServerSalt::setStore($this->_model->getStore());
TrafficLimiter::setConfiguration($this->_conf);
TrafficLimiter::setStore($this->_model->getStore());
if (!TrafficLimiter::canPass()) {
$this->_return_message(
1, I18n::_(
'Please wait %d seconds between each post.',
$this->_conf->getKey('limit', 'traffic')
)
);
try {
TrafficLimiter::canPass();
} catch (Exception $e) {
$this->_return_message(1, $e->getMessage());
return;
}

93
lib/Persistence/TrafficLimiter.php
View File

@ -13,8 +13,10 @@
namespace PrivateBin\Persistence;
use Exception;
use IPLib\Factory;
use PrivateBin\Configuration;
use PrivateBin\I18n;
/**
* TrafficLimiter
@ -24,13 +26,13 @@ use PrivateBin\Configuration;
class TrafficLimiter extends AbstractPersistence
{
/**
* time limit in seconds, defaults to 10s
* listed IPs are the only ones allowed to create, defaults to null
*
* @access private
* @static
* @var int
* @var string|null
*/
private static $_limit = 10;
private static $_creators = null;
/**
* listed IPs are exempted from limits, defaults to null
@ -51,19 +53,49 @@ class TrafficLimiter extends AbstractPersistence
private static $_ipKey = 'REMOTE_ADDR';
/**
* set the time limit in seconds
* time limit in seconds, defaults to 10s
*
* @access private
* @static
* @var int
*/
private static $_limit = 10;
/**
* set configuration options of the traffic limiter
*
* @access public
* @static
* @param int $limit
* @param Configuration $conf
*/
public static function setLimit($limit)
public static function setConfiguration(Configuration $conf)
{
self::$_limit = $limit;
self::setCreators($conf->getKey('creators', 'traffic'));
self::setExempted($conf->getKey('exempted', 'traffic'));
self::setLimit($conf->getKey('limit', 'traffic'));
if (($option = $conf->getKey('header', 'traffic')) !== '') {
$httpHeader = 'HTTP_' . $option;
if (array_key_exists($httpHeader, $_SERVER) && !empty($_SERVER[$httpHeader])) {
self::$_ipKey = $httpHeader;
}
}
}
/**
* set a list of IP(-ranges) as string
* set a list of creator IP(-ranges) as string
*
* @access public
* @static
* @param string $creators
*/
public static function setCreators($creators)
{
self::$_creators = $creators;
}
/**
* set a list of exempted IP(-ranges) as string
*
* @access public
* @static
@ -75,23 +107,15 @@ class TrafficLimiter extends AbstractPersistence
}
/**
* set configuration options of the traffic limiter
* set the time limit in seconds
*
* @access public
* @static
* @param Configuration $conf
* @param int $limit
*/
public static function setConfiguration(Configuration $conf)
public static function setLimit($limit)
{
self::setLimit($conf->getKey('limit', 'traffic'));
self::setExempted($conf->getKey('exempted', 'traffic'));
if (($option = $conf->getKey('header', 'traffic')) !== '') {
$httpHeader = 'HTTP_' . $option;
if (array_key_exists($httpHeader, $_SERVER) && !empty($_SERVER[$httpHeader])) {
self::$_ipKey = $httpHeader;
}
}
self::$_limit = $limit;
}
/**
@ -108,7 +132,7 @@ class TrafficLimiter extends AbstractPersistence
}
/**
* Validate $_ipKey against configured ipranges. If matched we will ignore the ip
* validate $_ipKey against configured ipranges. If matched we will ignore the ip
*
* @access private
* @static
@ -136,22 +160,33 @@ class TrafficLimiter extends AbstractPersistence
}
/**
* traffic limiter
*
* Make sure the IP address makes at most 1 request every 10 seconds.
* make sure the IP address is allowed to perfom a request
*
* @access public
* @static
* @return bool
* @throws Exception
* @return true
*/
public static function canPass()
{
// if creators are defined, the traffic limiter will only allow creation
// for these, with no limits, and skip any other rules
if (!empty(self::$_creators)) {
$creatorIps = explode(',', self::$_creators);
foreach ($creatorIps as $ipRange) {
if (self::matchIp($ipRange) === true) {
return true;
}
}
throw new Exception(I18n::_('Your IP is not authorized to create pastes.'));
}
// disable limits if set to less then 1
if (self::$_limit < 1) {
return true;
}
// Check if $_ipKey is exempted from ratelimiting
// check if $_ipKey is exempted from ratelimiting
if (!empty(self::$_exempted)) {
$exIp_array = explode(',', self::$_exempted);
foreach ($exIp_array as $ipRange) {
@ -175,6 +210,10 @@ class TrafficLimiter extends AbstractPersistence
if (!self::$_store->setValue((string) $tl, 'traffic_limiter', $hash)) {
error_log('failed to store the traffic limiter, it probably contains outdated information');
}
return $result;
if ($result) return true;
throw new Exception(I18n::_(
'Please wait %d seconds between each post.',
self::$_limit
));
}
}

39
tst/Persistence/TrafficLimiterTest.php
View File

@ -38,13 +38,21 @@ class TrafficLimiterTest extends PHPUnit_Framework_TestCase
$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
$this->assertTrue(TrafficLimiter::canPass(), 'first request may pass');
sleep(1);
$this->assertFalse(TrafficLimiter::canPass(), 'second request is to fast, may not pass');
try {
$this->assertFalse(TrafficLimiter::canPass(), 'expected an exception');
} catch (Exception $e) {
$this->assertEquals($e->getMessage(), 'Please wait 4 seconds between each post.', 'second request is to fast, may not pass');
}
sleep(4);
$this->assertTrue(TrafficLimiter::canPass(), 'third request waited long enough and may pass');
$_SERVER['REMOTE_ADDR'] = '2001:1620:2057:dead:beef::cafe:babe';
$this->assertTrue(TrafficLimiter::canPass(), 'fourth request has different ip and may pass');
$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
$this->assertFalse(TrafficLimiter::canPass(), 'fifth request is to fast, may not pass');
try {
$this->assertFalse(TrafficLimiter::canPass(), 'expected an exception');
} catch (Exception $e) {
$this->assertEquals($e->getMessage(), 'Please wait 4 seconds between each post.', 'fifth request is to fast, may not pass');
}
}
public function testTrafficLimitExempted()
@ -52,7 +60,11 @@ class TrafficLimiterTest extends PHPUnit_Framework_TestCase
TrafficLimiter::setExempted('1.2.3.4,10.10.10.0/24,2001:1620:2057::/48');
$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
$this->assertTrue(TrafficLimiter::canPass(), 'first request may pass');
$this->assertFalse(TrafficLimiter::canPass(), 'not exempted');
try {
$this->assertFalse(TrafficLimiter::canPass(), 'expected an exception');
} catch (Exception $e) {
$this->assertEquals($e->getMessage(), 'Please wait 4 seconds between each post.', 'not exempted');
}
$_SERVER['REMOTE_ADDR'] = '10.10.10.10';
$this->assertTrue(TrafficLimiter::canPass(), 'IPv4 in exempted range');
$this->assertTrue(TrafficLimiter::canPass(), 'request is to fast, but IPv4 in exempted range');
@ -61,7 +73,11 @@ class TrafficLimiterTest extends PHPUnit_Framework_TestCase
$this->assertTrue(TrafficLimiter::canPass(), 'request is to fast, but IPv6 in exempted range');
TrafficLimiter::setExempted('127.*,foobar');
$this->assertTrue(TrafficLimiter::canPass(), 'first cached request may pass');
$this->assertFalse(TrafficLimiter::canPass(), 'request is to fast, invalid range');
try {
$this->assertFalse(TrafficLimiter::canPass(), 'expected an exception');
} catch (Exception $e) {
$this->assertEquals($e->getMessage(), 'Please wait 4 seconds between each post.', 'request is to fast, invalid range');
}
$_SERVER['REMOTE_ADDR'] = 'foobar';
$this->assertTrue(TrafficLimiter::canPass(), 'non-IP address');
$this->assertTrue(TrafficLimiter::canPass(), 'request is to fast, but non-IP address matches exempted range');
@ -71,16 +87,23 @@ class TrafficLimiterTest extends PHPUnit_Framework_TestCase
{
TrafficLimiter::setCreators('1.2.3.4,10.10.10.0/24,2001:1620:2057::/48');
$_SERVER['REMOTE_ADDR'] = '127.0.0.1';
$this->assertFalse(TrafficLimiter::canPass(), 'not a creator');
try {
$this->assertFalse(TrafficLimiter::canPass(), 'expected an exception');
} catch (Exception $e) {
$this->assertEquals($e->getMessage(), 'Your IP is not authorized to create pastes.', 'not a creator');
}
$_SERVER['REMOTE_ADDR'] = '10.10.10.10';
$this->assertTrue(TrafficLimiter::canPass(), 'IPv4 in creator range');
$this->assertTrue(TrafficLimiter::canPass(), 'request is to fast, but IPv4 in creator range');
$_SERVER['REMOTE_ADDR'] = '2001:1620:2057:dead:beef::cafe:babe';
$this->assertTrue(TrafficLimiter::canPass(), 'IPv6 in creator range');
$this->assertTrue(TrafficLimiter::canPass(), 'request is to fast, but IPv6 in creator range');
TrafficLimiter::setExempted('127.*,foobar');
$this->assertTrue(TrafficLimiter::canPass(), 'first cached request may pass');
$this->assertFalse(TrafficLimiter::canPass(), 'request is to fast, not a creator');
TrafficLimiter::setCreators('127.*,foobar');
try {
$this->assertFalse(TrafficLimiter::canPass(), 'expected an exception');
} catch (Exception $e) {
$this->assertEquals($e->getMessage(), 'Your IP is not authorized to create pastes.', 'request is to fast, not a creator');
}
$_SERVER['REMOTE_ADDR'] = 'foobar';
$this->assertTrue(TrafficLimiter::canPass(), 'non-IP address');
$this->assertTrue(TrafficLimiter::canPass(), 'request is to fast, but non-IP address matches creator');