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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * https://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | |
| 21 | namespace MediaWiki\Extension\StopForumSpam; |
| 22 | |
| 23 | use BagOStuff; |
| 24 | use DomainException; |
| 25 | use IStoreKeyEncoder; |
| 26 | use MediaWiki\Http\HttpRequestFactory; |
| 27 | use MediaWiki\Logger\LoggerFactory; |
| 28 | use MediaWiki\MediaWikiServices; |
| 29 | use Psr\Log\LoggerInterface; |
| 30 | use Psr\Log\NullLogger; |
| 31 | use RuntimeException; |
| 32 | use WANObjectCache; |
| 33 | use Wikimedia\IPSet; |
| 34 | use Wikimedia\IPUtils; |
| 35 | |
| 36 | /** |
| 37 | * @internal |
| 38 | */ |
| 39 | class DenyListManager { |
| 40 | |
| 41 | private const CACHE_VERSION = 1; |
| 42 | |
| 43 | /** @var HttpRequestFactory */ |
| 44 | private $http; |
| 45 | /** @var BagOStuff */ |
| 46 | private $srvCache; |
| 47 | /** @var WANObjectCache */ |
| 48 | private $wanCache; |
| 49 | /** @var LoggerInterface */ |
| 50 | private $logger; |
| 51 | |
| 52 | /** @var IPSet|null */ |
| 53 | private $denyListIPSet; |
| 54 | |
| 55 | /** @var self */ |
| 56 | private static $instance = null; |
| 57 | |
| 58 | /** |
| 59 | * @param HttpRequestFactory $http |
| 60 | * @param BagOStuff $srvCache |
| 61 | * @param WANObjectCache $wanCache |
| 62 | * @param LoggerInterface|null $logger |
| 63 | */ |
| 64 | public function __construct( |
| 65 | HttpRequestFactory $http, |
| 66 | BagOStuff $srvCache, |
| 67 | WANObjectCache $wanCache, |
| 68 | ?LoggerInterface $logger |
| 69 | ) { |
| 70 | $this->http = $http; |
| 71 | $this->srvCache = $srvCache; |
| 72 | $this->wanCache = $wanCache; |
| 73 | $this->logger = $logger ?: new NullLogger(); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * @todo use MediaWikiServices |
| 78 | * @return DenyListManager |
| 79 | */ |
| 80 | public static function singleton() { |
| 81 | if ( self::$instance == null ) { |
| 82 | $services = MediaWikiServices::getInstance(); |
| 83 | |
| 84 | $srvCache = $services->getLocalServerObjectCache(); |
| 85 | $wanCache = $services->getMainWANObjectCache(); |
| 86 | $http = $services->getHttpRequestFactory(); |
| 87 | $logger = LoggerFactory::getInstance( 'DenyList' ); |
| 88 | |
| 89 | self::$instance = new self( $http, $srvCache, $wanCache, $logger ); |
| 90 | } |
| 91 | |
| 92 | return self::$instance; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Check whether the IP address is deny-listed |
| 97 | * |
| 98 | * @param string $ip An IP address |
| 99 | * @return bool |
| 100 | */ |
| 101 | public function isIpDenyListed( $ip ) { |
| 102 | if ( IPUtils::isIPAddress( $ip ) === null ) { |
| 103 | return false; |
| 104 | } |
| 105 | |
| 106 | return $this->getIpDenyListSet()->match( $ip ); |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * Get the list of deny-listed IPs from cache only |
| 111 | * |
| 112 | * @return string[]|false List of deny-listed IP addresses; false if uncached |
| 113 | */ |
| 114 | public function getCachedIpDenyList() { |
| 115 | return $this->getIpDenyList(); |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Purge cache of deny-list IPs |
| 120 | * |
| 121 | * @return bool Success |
| 122 | */ |
| 123 | public function purgeCachedIpDenyList() { |
| 124 | $wanCache = $this->wanCache; |
| 125 | |
| 126 | return $wanCache->delete( $this->getDenyListKey( $wanCache ) ); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Fetch the list of IPs from cache, regenerating the cache as needed |
| 131 | * |
| 132 | * @param string|null $recache Use 'recache' to force a recache |
| 133 | * @return string[] List of deny-listed IP addresses |
| 134 | */ |
| 135 | public function getIpDenyList( $recache = null ): array { |
| 136 | global $wgSFSDenyListCacheDuration; |
| 137 | |
| 138 | $srvCache = $this->srvCache; |
| 139 | $srvCacheKey = $this->getDenyListKey( $srvCache ); |
| 140 | if ( $recache === 'recache' ) { |
| 141 | $flatIpList = false; |
| 142 | } else { |
| 143 | $flatIpList = $srvCache->get( $srvCacheKey ); |
| 144 | } |
| 145 | |
| 146 | if ( $flatIpList === false ) { |
| 147 | $wanCache = $this->wanCache; |
| 148 | $flatHexIpList = $wanCache->getWithSetCallback( |
| 149 | $this->getDenyListKey( $wanCache ), |
| 150 | $wgSFSDenyListCacheDuration, |
| 151 | function () { |
| 152 | // This uses hexadecimal IP addresses to reduce network I/O |
| 153 | return $this->fetchFlatDenyListHexIps(); |
| 154 | }, |
| 155 | [ |
| 156 | 'lockTSE' => $wgSFSDenyListCacheDuration, |
| 157 | 'staleTTL' => $wgSFSDenyListCacheDuration, |
| 158 | // placeholder |
| 159 | 'busyValue' => '', |
| 160 | 'minAsOf' => ( $recache === 'recache' ) ? INF : $wanCache::MIN_TIMESTAMP_NONE |
| 161 | ] |
| 162 | ); |
| 163 | |
| 164 | $ips = []; |
| 165 | for ( $hex = strtok( $flatHexIpList, "\n" ); $hex !== false; $hex = strtok( "\n" ) ) { |
| 166 | $ips[] = IPUtils::formatHex( $hex ); |
| 167 | } |
| 168 | |
| 169 | $flatIpList = implode( "\n", $ips ); |
| 170 | |
| 171 | // Refill the local server cache if the list is not empty nor a placeholder |
| 172 | if ( $flatIpList !== '' ) { |
| 173 | $srvCache->set( |
| 174 | $srvCacheKey, |
| 175 | $flatIpList, |
| 176 | mt_rand( $srvCache::TTL_HOUR, $srvCache::TTL_DAY ) |
| 177 | ); |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | return ( $flatIpList != '' ) ? explode( "\n", $flatIpList ) : []; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * @param string|null $recache Use 'recache' to force a recache |
| 186 | * @return IPSet |
| 187 | */ |
| 188 | public function getIpDenyListSet( $recache = null ) { |
| 189 | if ( $this->denyListIPSet === null || $recache === "recache" ) { |
| 190 | $this->denyListIPSet = new IPSet( $this->getIpDenyList( $recache ) ); |
| 191 | } |
| 192 | |
| 193 | return $this->denyListIPSet; |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * @param IStoreKeyEncoder $cache |
| 198 | * @return string Cache key for primary deny list |
| 199 | */ |
| 200 | private function getDenyListKey( IStoreKeyEncoder $cache ) { |
| 201 | return $cache->makeGlobalKey( 'sfs-denylist-set', self::CACHE_VERSION ); |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * @return string Newline separated list of SFS deny-listed IP addresses |
| 206 | */ |
| 207 | private function fetchFlatDenyListHexIps(): string { |
| 208 | global $wgSFSIPListLocation, $wgSFSValidateIPListLocationMD5; |
| 209 | |
| 210 | if ( $wgSFSIPListLocation === false ) { |
| 211 | throw new DomainException( '$wgSFSIPListLocation has not been configured.' ); |
| 212 | } |
| 213 | |
| 214 | if ( is_file( $wgSFSIPListLocation ) ) { |
| 215 | $ipList = $this->fetchFlatDenyListHexIpsLocal( $wgSFSIPListLocation ); |
| 216 | } else { |
| 217 | $ipList = $this->fetchFlatDenyListHexIpsRemote( |
| 218 | $wgSFSIPListLocation, |
| 219 | $wgSFSValidateIPListLocationMD5 |
| 220 | ); |
| 221 | } |
| 222 | |
| 223 | return $ipList; |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * Fetch gunzipped/unzipped SFS deny list from local file |
| 228 | * |
| 229 | * @param string $listFilePath Local file path |
| 230 | * @return string Newline separated list of SFS deny-listed IP addresses |
| 231 | */ |
| 232 | private function fetchFlatDenyListHexIpsLocal( string $listFilePath ): string { |
| 233 | global $wgSFSIPThreshold; |
| 234 | |
| 235 | $fh = fopen( $listFilePath, 'rb' ); |
| 236 | if ( !$fh ) { |
| 237 | throw new DomainException( "wgSFSIPListLocation file handle could not be obtained." ); |
| 238 | } |
| 239 | |
| 240 | $ipList = []; |
| 241 | |
| 242 | while ( !feof( $fh ) ) { |
| 243 | $ipData = fgetcsv( $fh, 4096, ',', '"' ); |
| 244 | if ( $ipData === false ) { |
| 245 | break; |
| 246 | } |
| 247 | |
| 248 | if ( $ipData === null || $ipData === [ null ] ) { |
| 249 | continue; |
| 250 | } |
| 251 | if ( isset( $ipData[1] ) && $ipData[1] < $wgSFSIPThreshold ) { |
| 252 | continue; |
| 253 | } |
| 254 | |
| 255 | $ip = (string)$ipData[0]; |
| 256 | $hex = IPUtils::toHex( $ip ); |
| 257 | if ( $hex === false ) { |
| 258 | // invalid address |
| 259 | continue; |
| 260 | } |
| 261 | |
| 262 | $ipList[] = $hex; |
| 263 | } |
| 264 | |
| 265 | return implode( "\n", $ipList ); |
| 266 | } |
| 267 | |
| 268 | /** |
| 269 | * Fetch SFS IP deny list file from SFS site and returns an array of IPs |
| 270 | * (https://www.stopforumspam.com/downloads - use gz files) |
| 271 | * |
| 272 | * @param string $uri SFS vendor or third-party URL to the list |
| 273 | * @param string|null $md5uri SFS vendor URL to the MD5 of the list |
| 274 | * @return string Newline-separated list of SFS deny-listed IP addresses |
| 275 | */ |
| 276 | private function fetchFlatDenyListHexIpsRemote( string $uri, ?string $md5uri ): string { |
| 277 | global $wgSFSProxy, $wgSFSIPThreshold; |
| 278 | |
| 279 | // Hacky, but needed to keep a sensible default value of $wgSFSIPListLocation for |
| 280 | // users, whilst also preventing HTTP requests for other extension when they call |
| 281 | // permission related hooks that mean the code here gets executed too... |
| 282 | // So, if we have a URL, and try and do a HTTP request whilst in MW_PHPUNIT_TEST, |
| 283 | // just fallback to loading sample_denylist_all.txt as a file... |
| 284 | // See also: T262443, T265628. |
| 285 | if ( defined( 'MW_PHPUNIT_TEST' ) ) { |
| 286 | $filePath = dirname( __DIR__ ) . '/tests/phpunit/sample_denylist_all.txt'; |
| 287 | return $this->fetchFlatDenyListHexIpsLocal( $filePath ); |
| 288 | } |
| 289 | |
| 290 | if ( !filter_var( $uri, FILTER_VALIDATE_URL ) ) { |
| 291 | throw new DomainException( "wgSFSIPListLocation does not appear to be a valid URL." ); |
| 292 | } |
| 293 | |
| 294 | // check for zlib function for later processing |
| 295 | if ( !function_exists( 'gzdecode' ) ) { |
| 296 | throw new RuntimeException( "Zlib does not appear to be configured for php!" ); |
| 297 | } |
| 298 | |
| 299 | $options = [ 'followRedirects' => true ]; |
| 300 | if ( $wgSFSProxy !== false ) { |
| 301 | $options['proxy'] = $wgSFSProxy; |
| 302 | } |
| 303 | |
| 304 | $fileData = $this->fetchRemoteFile( $uri, $options ); |
| 305 | if ( $fileData === '' ) { |
| 306 | $this->logger->error( __METHOD__ . ": SFS IP list could not be fetched!" ); |
| 307 | |
| 308 | return ''; |
| 309 | } |
| 310 | |
| 311 | if ( is_string( $md5uri ) && $md5uri !== '' ) { |
| 312 | // check vendor-provided md5 |
| 313 | $fileDataMD5 = $this->fetchRemoteFile( $md5uri, $options ); |
| 314 | if ( $fileDataMD5 === '' ) { |
| 315 | $this->logger->error( __METHOD__ . ": SFS IP list MD5 could not be fetched!" ); |
| 316 | return ''; |
| 317 | } |
| 318 | |
| 319 | if ( md5( $fileData ) !== $fileDataMD5 ) { |
| 320 | $this->logger->error( __METHOD__ . ": SFS IP list has an unexpected MD5!" ); |
| 321 | return ''; |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | // ungzip and process vendor file |
| 326 | $csvTable = gzdecode( $fileData ); |
| 327 | if ( $csvTable === false ) { |
| 328 | $this->logger->error( __METHOD__ . ": SFS IP file contents could not be decoded!" ); |
| 329 | return ''; |
| 330 | } |
| 331 | |
| 332 | $ipList = []; |
| 333 | $scoreSkipped = 0; |
| 334 | $rows = 0; |
| 335 | |
| 336 | for ( $line = strtok( $csvTable, "\n" ); $line !== false; $line = strtok( "\n" ) ) { |
| 337 | |
| 338 | $rows++; |
| 339 | |
| 340 | $ipData = str_getcsv( $line ); |
| 341 | $ip = (string)$ipData[0]; |
| 342 | $score = (int)$ipData[1]; |
| 343 | |
| 344 | if ( $score && ( $score < $wgSFSIPThreshold ) ) { |
| 345 | $scoreSkipped++; |
| 346 | continue; |
| 347 | } |
| 348 | |
| 349 | $hex = IPUtils::toHex( $ip ); |
| 350 | if ( $hex === false ) { |
| 351 | // invalid address |
| 352 | continue; |
| 353 | } |
| 354 | |
| 355 | $ipList[] = $hex; |
| 356 | } |
| 357 | |
| 358 | if ( $scoreSkipped > 0 ) { |
| 359 | $this->logger->info( |
| 360 | __METHOD__ . ": {$rows} rows were processed. " |
| 361 | . "{$scoreSkipped} were skipped because their score was less than {$wgSFSIPThreshold}." |
| 362 | ); |
| 363 | } |
| 364 | |
| 365 | return implode( "\n", $ipList ); |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * Fetch a network file's contents via HttpRequestFactory |
| 370 | * |
| 371 | * @param string $fileUrl |
| 372 | * @param array $httpOptions |
| 373 | * @return string |
| 374 | */ |
| 375 | private function fetchRemoteFile( string $fileUrl, array $httpOptions ): string { |
| 376 | $req = $this->http->create( $fileUrl, $httpOptions ); |
| 377 | |
| 378 | $status = $req->execute(); |
| 379 | if ( !$status->isOK() ) { |
| 380 | throw new RuntimeException( "Failed to download resource at {$fileUrl}" ); |
| 381 | } |
| 382 | |
| 383 | $code = $req->getStatus(); |
| 384 | if ( $code !== 200 ) { |
| 385 | throw new RuntimeException( "Unexpected HTTP {$code} response from {$fileUrl}" ); |
| 386 | } |
| 387 | |
| 388 | return (string)$req->getContent(); |
| 389 | } |
| 390 | } |