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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Hooks for the Extension:TorBlock for MediaWiki |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 19 | * http://www.gnu.org/copyleft/gpl.html |
| 20 | * |
| 21 | * @file |
| 22 | * @ingroup Extensions |
| 23 | * @link https://www.mediawiki.org/wiki/Extension:TorBlock Documentation |
| 24 | * |
| 25 | * @author Andrew Garrett <andrew@epstone.net> |
| 26 | * @license GPL-2.0-or-later |
| 27 | */ |
| 28 | |
| 29 | // phpcs:disable MediaWiki.NamingConventions.LowerCamelFunctionsName.FunctionName |
| 30 | // Need to be able to define ::onRecentChange_Save |
| 31 | |
| 32 | namespace MediaWiki\Extension\TorBlock; |
| 33 | |
| 34 | use MediaWiki\Block\AbstractBlock; |
| 35 | use MediaWiki\Block\DatabaseBlock; |
| 36 | use MediaWiki\Block\Hook\AbortAutoblockHook; |
| 37 | use MediaWiki\Block\Hook\GetUserBlockHook; |
| 38 | use MediaWiki\ChangeTags\Hook\ChangeTagsListActiveHook; |
| 39 | use MediaWiki\ChangeTags\Hook\ListDefinedTagsHook; |
| 40 | use MediaWiki\Extension\TorBlock\Hooks\HookRunner; |
| 41 | use MediaWiki\Hook\OtherBlockLogLinkHook; |
| 42 | use MediaWiki\Hook\RecentChange_saveHook; |
| 43 | use MediaWiki\HookContainer\HookContainer; |
| 44 | use MediaWiki\Html\Html; |
| 45 | use MediaWiki\Permissions\Hook\GetUserPermissionsErrorsExpensiveHook; |
| 46 | use MediaWiki\Title\Title; |
| 47 | use MediaWiki\User\Hook\AutopromoteConditionHook; |
| 48 | use MediaWiki\User\Hook\GetAutoPromoteGroupsHook; |
| 49 | use MediaWiki\User\Hook\UserCanSendEmailHook; |
| 50 | use MediaWiki\User\User; |
| 51 | use RecentChange; |
| 52 | use Wikimedia\IPUtils; |
| 53 | |
| 54 | class Hooks implements |
| 55 | AbortAutoblockHook, |
| 56 | AutopromoteConditionHook, |
| 57 | GetUserPermissionsErrorsExpensiveHook, |
| 58 | GetAutoPromoteGroupsHook, |
| 59 | GetUserBlockHook, |
| 60 | RecentChange_saveHook, |
| 61 | ListDefinedTagsHook, |
| 62 | ChangeTagsListActiveHook, |
| 63 | UserCanSendEmailHook, |
| 64 | OtherBlockLogLinkHook |
| 65 | { |
| 66 | |
| 67 | private HookRunner $hookRunner; |
| 68 | |
| 69 | public static function registerExtension() { |
| 70 | // Define new autopromote condition |
| 71 | // Numbers won't work, we'll get collisions |
| 72 | define( 'APCOND_TOR', 'tor' ); |
| 73 | } |
| 74 | |
| 75 | public function __construct( HookContainer $hookContainer ) { |
| 76 | $this->hookRunner = new HookRunner( $hookContainer ); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Whether the given user is allowed to perform $action from its current IP |
| 81 | * |
| 82 | * @param User $user |
| 83 | * @param string|null $action |
| 84 | * @return bool |
| 85 | */ |
| 86 | private static function checkUserCan( User $user, $action = null ) { |
| 87 | global $wgTorAllowedActions, $wgRequest; |
| 88 | |
| 89 | if ( ( $action !== null && in_array( $action, $wgTorAllowedActions ) ) |
| 90 | || !TorExitNodes::isExitNode() |
| 91 | ) { |
| 92 | return true; |
| 93 | } |
| 94 | |
| 95 | wfDebugLog( 'torblock', "User detected as editing through tor." ); |
| 96 | |
| 97 | global $wgTorBypassPermissions; |
| 98 | foreach ( $wgTorBypassPermissions as $perm ) { |
| 99 | if ( $user->isAllowed( $perm ) ) { |
| 100 | wfDebugLog( 'torblock', "User has $perm permission. Exempting from Tor Blocks." ); |
| 101 | |
| 102 | return true; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | $ip = $wgRequest->getIP(); |
| 107 | if ( DatabaseBlock::isExemptedFromAutoblocks( $ip ) ) { |
| 108 | wfDebugLog( 'torblock', "IP is excluded from autoblocks. Exempting from Tor Blocks." ); |
| 109 | |
| 110 | return true; |
| 111 | } |
| 112 | |
| 113 | return false; |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * Check if a user is a Tor node and not excluded from autoblocks or allowed |
| 118 | * to bypass tor blocks. |
| 119 | * |
| 120 | * @param Title $title Title being acted upon |
| 121 | * @param User $user User performing the action |
| 122 | * @param string $action Action being performed |
| 123 | * @param array &$result Will be filled with block status if blocked |
| 124 | * @return bool |
| 125 | */ |
| 126 | public function onGetUserPermissionsErrorsExpensive( |
| 127 | $title, |
| 128 | $user, |
| 129 | $action, |
| 130 | &$result |
| 131 | ) { |
| 132 | global $wgRequest; |
| 133 | if ( !self::checkUserCan( $user, $action ) ) { |
| 134 | wfDebugLog( 'torblock', "User detected as editing from Tor node. " . |
| 135 | "Adding Tor block to permissions errors." ); |
| 136 | |
| 137 | // Allow site customization of blocked message. |
| 138 | $blockedMsg = 'torblock-blocked'; |
| 139 | $this->hookRunner->onTorBlockBlockedMsg( $blockedMsg ); |
| 140 | $result = [ $blockedMsg, $wgRequest->getIP() ]; |
| 141 | |
| 142 | return false; |
| 143 | } |
| 144 | |
| 145 | return true; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Check if the user is logged in from a Tor exit node but is not exempt. |
| 150 | * If so, block the user. |
| 151 | * |
| 152 | * @param User $user |
| 153 | * @param array &$hookErr |
| 154 | * @return bool |
| 155 | */ |
| 156 | public function onUserCanSendEmail( $user, &$hookErr ) { |
| 157 | global $wgRequest; |
| 158 | if ( !self::checkUserCan( $user ) ) { |
| 159 | wfDebugLog( 'torblock', "User detected as trying to send an email from Tor node. Preventing." ); |
| 160 | |
| 161 | // Allow site customization of blocked message. |
| 162 | $blockedMsg = 'torblock-blocked'; |
| 163 | $this->hookRunner->onTorBlockBlockedMsg( $blockedMsg ); |
| 164 | $hookErr = [ |
| 165 | 'permissionserrors', |
| 166 | $blockedMsg, |
| 167 | [ $wgRequest->getIP() ], |
| 168 | ]; |
| 169 | return false; |
| 170 | } |
| 171 | |
| 172 | return true; |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Remove a block if it only targets a Tor node. A composite block comprises |
| 177 | * multiple blocks, and if any of these target the user, then do not remove the |
| 178 | * block. |
| 179 | * |
| 180 | * @param User $user |
| 181 | * @param string|null $ip |
| 182 | * @param AbstractBlock|null &$block |
| 183 | * @return bool |
| 184 | */ |
| 185 | public function onGetUserBlock( $user, $ip, &$block ) { |
| 186 | global $wgTorDisableAdminBlocks; |
| 187 | if ( !$block || !$wgTorDisableAdminBlocks || !TorExitNodes::isExitNode() ) { |
| 188 | return true; |
| 189 | } |
| 190 | |
| 191 | $blocks = $block->toArray(); |
| 192 | |
| 193 | $removeBlock = true; |
| 194 | foreach ( $blocks as $singleBlock ) { |
| 195 | if ( $singleBlock->getType() === AbstractBlock::TYPE_USER ) { |
| 196 | $removeBlock = false; |
| 197 | break; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | if ( $removeBlock ) { |
| 202 | wfDebugLog( 'torblock', "User using Tor node. Disabling IP block as it was " . |
| 203 | "probably targeted at the Tor node." ); |
| 204 | // Node is probably blocked for being a Tor node. Remove block. |
| 205 | $block = null; |
| 206 | } |
| 207 | |
| 208 | return true; |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * If an IP address is an exit node, stop it from being autoblocked. |
| 213 | * |
| 214 | * @param string $autoblockip IP address being blocked |
| 215 | * @param DatabaseBlock $block Block being applied |
| 216 | * @return bool |
| 217 | */ |
| 218 | public function onAbortAutoblock( $autoblockip, $block ) { |
| 219 | return !TorExitNodes::isExitNode( $autoblockip ); |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * When the user is a Tor exit node, make sure they meet configured |
| 224 | * age/edit count requirements before allowing promotions. |
| 225 | * |
| 226 | * @param User $user User being promoted |
| 227 | * @param array &$promote Groups being added |
| 228 | * @return bool |
| 229 | */ |
| 230 | public function onGetAutoPromoteGroups( $user, &$promote ) { |
| 231 | global $wgTorAutoConfirmAge, $wgTorAutoConfirmCount; |
| 232 | |
| 233 | // Check against stricter requirements for tor nodes. |
| 234 | // Counterintuitively, we do the requirement checks first. |
| 235 | // This is so that we don't have to hit memcached to get the |
| 236 | // exit list, unnecessarily. |
| 237 | |
| 238 | if ( !count( $promote ) ) { |
| 239 | // No groups to promote to anyway |
| 240 | return true; |
| 241 | } |
| 242 | |
| 243 | $age = time() - (int)wfTimestampOrNull( TS_UNIX, $user->getRegistration() ); |
| 244 | |
| 245 | if ( $age >= $wgTorAutoConfirmAge && $user->getEditCount() >= $wgTorAutoConfirmCount ) { |
| 246 | // Does match requirements. Don't bother checking if we're an exit node. |
| 247 | return true; |
| 248 | } |
| 249 | |
| 250 | if ( TorExitNodes::isExitNode() ) { |
| 251 | // Tor user, doesn't match the expanded requirements. |
| 252 | $promote = []; |
| 253 | } |
| 254 | |
| 255 | return true; |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Check if a user is a Tor node if the wiki is configured |
| 260 | * to autopromote on Tor status. |
| 261 | * |
| 262 | * @param string $type Condition being checked |
| 263 | * @param array $args Arguments passed to the condition |
| 264 | * @param User $user User being promoted |
| 265 | * @param array &$result Will be filled with result of condition |
| 266 | * @return bool |
| 267 | */ |
| 268 | public function onAutopromoteCondition( $type, $args, $user, &$result ) { |
| 269 | if ( $type == APCOND_TOR ) { |
| 270 | $result = TorExitNodes::isExitNode(); |
| 271 | } |
| 272 | |
| 273 | return true; |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * If enabled, tag recent changes made by a Tor exit node. |
| 278 | * |
| 279 | * @param RecentChange $recentChange The change being saved |
| 280 | * @return bool true |
| 281 | */ |
| 282 | public function onRecentChange_Save( $recentChange ) { |
| 283 | global $wgTorTagChanges; |
| 284 | |
| 285 | if ( $wgTorTagChanges && TorExitNodes::isExitNode() ) { |
| 286 | $recentChange->addTags( 'tor' ); |
| 287 | } |
| 288 | return true; |
| 289 | } |
| 290 | |
| 291 | /** |
| 292 | * If enabled, add a new tag type for recent changes made by Tor exit nodes. |
| 293 | * |
| 294 | * @param array &$emptyTags List of defined tags (for ListDefinedTags hook) or |
| 295 | * list of active tags (for ChangeTagsListActive hook) |
| 296 | * @return bool true |
| 297 | */ |
| 298 | public function onListDefinedTags( &$emptyTags ) { |
| 299 | global $wgTorTagChanges; |
| 300 | |
| 301 | if ( $wgTorTagChanges ) { |
| 302 | $emptyTags[] = 'tor'; |
| 303 | } |
| 304 | return true; |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * @param string[] &$tags |
| 309 | * |
| 310 | * @return bool |
| 311 | */ |
| 312 | public function onChangeTagsListActive( &$tags ) { |
| 313 | return $this->onListDefinedTags( $tags ); |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * Creates a message with the Tor blocking status if applicable. |
| 318 | * |
| 319 | * @param array &$msg Message with the status |
| 320 | * @param string $ip The IP address to be checked |
| 321 | * @return bool true |
| 322 | */ |
| 323 | public function onOtherBlockLogLink( &$msg, $ip ) { |
| 324 | // IP addresses can be blocked only |
| 325 | // Fast return if IP is not an exit node |
| 326 | if ( IPUtils::isIPAddress( $ip ) && TorExitNodes::isExitNode( $ip ) ) { |
| 327 | $msg[] = Html::rawElement( |
| 328 | 'span', |
| 329 | [ 'class' => 'mw-torblock-isexitnode' ], |
| 330 | wfMessage( 'torblock-isexitnode', $ip )->parse() |
| 331 | ); |
| 332 | } |
| 333 | return true; |
| 334 | } |
| 335 | } |