Add ldap:reset-group command to unmap groups from LDAP

apps/user_ldap/appinfo/info.xml

@@ -50,6 +50,7 @@ A user logs into Nextcloud with their LDAP or AD credentials, and is granted acc
 		<command>OCA\User_LDAP\Command\CheckUser</command>
 		<command>OCA\User_LDAP\Command\CreateEmptyConfig</command>
 		<command>OCA\User_LDAP\Command\DeleteConfig</command>
+		<command>OCA\User_LDAP\Command\ResetGroup</command>
 		<command>OCA\User_LDAP\Command\ResetUser</command>
 		<command>OCA\User_LDAP\Command\Search</command>
 		<command>OCA\User_LDAP\Command\SetConfig</command>

apps/user_ldap/composer/composer/autoload_classmap.php

@@ -14,6 +14,7 @@
     'OCA\\User_LDAP\\Command\\CheckUser' => $baseDir . '/../lib/Command/CheckUser.php',
     'OCA\\User_LDAP\\Command\\CreateEmptyConfig' => $baseDir . '/../lib/Command/CreateEmptyConfig.php',
     'OCA\\User_LDAP\\Command\\DeleteConfig' => $baseDir . '/../lib/Command/DeleteConfig.php',
+    'OCA\\User_LDAP\\Command\\ResetGroup' => $baseDir . '/../lib/Command/ResetGroup.php',
     'OCA\\User_LDAP\\Command\\ResetUser' => $baseDir . '/../lib/Command/ResetUser.php',
     'OCA\\User_LDAP\\Command\\Search' => $baseDir . '/../lib/Command/Search.php',
     'OCA\\User_LDAP\\Command\\SetConfig' => $baseDir . '/../lib/Command/SetConfig.php',

apps/user_ldap/composer/composer/autoload_static.php

@@ -29,6 +29,7 @@ class ComposerStaticInitUser_LDAP
         'OCA\\User_LDAP\\Command\\CheckUser' => __DIR__ . '/..' . '/../lib/Command/CheckUser.php',
         'OCA\\User_LDAP\\Command\\CreateEmptyConfig' => __DIR__ . '/..' . '/../lib/Command/CreateEmptyConfig.php',
         'OCA\\User_LDAP\\Command\\DeleteConfig' => __DIR__ . '/..' . '/../lib/Command/DeleteConfig.php',
+        'OCA\\User_LDAP\\Command\\ResetGroup' => __DIR__ . '/..' . '/../lib/Command/ResetGroup.php',
         'OCA\\User_LDAP\\Command\\ResetUser' => __DIR__ . '/..' . '/../lib/Command/ResetUser.php',
         'OCA\\User_LDAP\\Command\\Search' => __DIR__ . '/..' . '/../lib/Command/Search.php',
         'OCA\\User_LDAP\\Command\\SetConfig' => __DIR__ . '/..' . '/../lib/Command/SetConfig.php',

apps/user_ldap/lib/Command/ResetGroup.php

@@ -0,0 +1,111 @@
+<?php
+/**
+ * @copyright Copyright (c) 2021 Arthur Schiwon <blizzz@arthur-schiwon.de>
+ *
+ * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
+ * @author Côme Chilliet <come.chilliet@nextcloud.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * 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/>.
+ *
+ */
+namespace OCA\User_LDAP\Command;
+
+use OCA\User_LDAP\Group_Proxy;
+use OCA\User_LDAP\GroupPluginManager;
+use OCP\IGroup;
+use OCP\IGroupManager;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Helper\QuestionHelper;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Question\Question;
+
+class ResetGroup extends Command {
+	private IGroupManager $groupManager;
+	private GroupPluginManager $pluginManager;
+	private Group_Proxy $backend;
+
+	public function __construct(
+		IGroupManager $groupManager,
+		GroupPluginManager $pluginManager,
+		Group_Proxy $backend
+	) {
+		$this->groupManager = $groupManager;
+		$this->pluginManager = $pluginManager;
+		$this->backend = $backend;
+		parent::__construct();
+	}
+
+	protected function configure(): void {
+		$this
+			->setName('ldap:reset-group')
+			->setDescription('deletes an LDAP group independent of the group state in the LDAP')
+			->addArgument(
+				'gid',
+				InputArgument::REQUIRED,
+				'the group name as used in Nextcloud'
+			)
+			->addOption(
+				'yes',
+				'y',
+				InputOption::VALUE_NONE,
+				'do not ask for confirmation'
+			);
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		try {
+			$gid = $input->getArgument('gid');
+			$group = $this->groupManager->get($gid);
+			if (!$group instanceof IGroup) {
+				throw new \Exception('Group not found');
+			}
+			$backends = $group->getBackendNames();
+			if (!in_array('LDAP', $backends)) {
+				throw new \Exception('The given group is not a recognized LDAP group.');
+			}
+			if ($input->getOption('yes') === false) {
+				/** @var QuestionHelper $helper */
+				$helper = $this->getHelper('question');
+				$q = new Question('Delete all local data of this group (y|N)? ');
+				$input->setOption('yes', $helper->ask($input, $output, $q) === 'y');
+			}
+			if ($input->getOption('yes') !== true) {
+				throw new \Exception('Reset cancelled by operator');
+			}
+
+			// Disable real deletion if a plugin supports it
+			$pluginManagerSuppressed = $this->pluginManager->setSuppressDeletion(true);
+			// Bypass groupExists test to force mapping deletion
+			$this->backend->getLDAPAccess($gid)->connection->writeToCache('groupExists' . $gid, false);
+			echo "calling delete $gid\n";
+			if ($group->delete()) {
+				$this->pluginManager->setSuppressDeletion($pluginManagerSuppressed);
+				return 0;
+			}
+		} catch (\Throwable $e) {
+			if (isset($pluginManagerSuppressed)) {
+				$this->pluginManager->setSuppressDeletion($pluginManagerSuppressed);
+			}
+			$output->writeln('<error>' . $e->getMessage() . '</error>');
+			return 1;
+		}
+		$output->writeln('<error>Error while resetting group</error>');
+		return 2;
+	}
+}

apps/user_ldap/lib/GroupPluginManager.php

@@ -26,9 +26,10 @@
 use OCP\GroupInterface;
 
 class GroupPluginManager {
-	private $respondToActions = 0;
+	private int $respondToActions = 0;
 
-	private $which = [
+	/** @var array<int, ?ILDAPGroupPlugin> */
+	private array $which = [
 		GroupInterface::CREATE_GROUP => null,
 		GroupInterface::DELETE_GROUP => null,
 		GroupInterface::ADD_TO_GROUP => null,
@@ -37,6 +38,8 @@ class GroupPluginManager {
 		GroupInterface::GROUP_DETAILS => null
 	];
 
+	private bool $suppressDeletion = false;
+
 	/**
 	 * @return int All implemented actions
 	 */
@@ -84,16 +87,31 @@ public function createGroup($gid) {
 		throw new \Exception('No plugin implements createGroup in this LDAP Backend.');
 	}
 
+	public function canDeleteGroup(): bool {
+		return !$this->suppressDeletion && $this->implementsActions(GroupInterface::DELETE_GROUP);
+	}
+
+	/**
+	 * @return bool – the value before the change
+	 */
+	public function setSuppressDeletion(bool $value): bool {
+		$old = $this->suppressDeletion;
+		$this->suppressDeletion = $value;
+		return $old;
+	}
+
 	/**
 	 * Delete a group
-	 * @param string $gid Group Id of the group to delete
-	 * @return bool
+	 *
 	 * @throws \Exception
 	 */
-	public function deleteGroup($gid) {
+	public function deleteGroup(string $gid): bool {
 		$plugin = $this->which[GroupInterface::DELETE_GROUP];
 
 		if ($plugin) {
+			if ($this->suppressDeletion) {
+				return false;
+			}
 			return $plugin->deleteGroup($gid);
 		}
 		throw new \Exception('No plugin implements deleteGroup in this LDAP Backend.');

apps/user_ldap/lib/Group_LDAP.php

@@ -48,10 +48,11 @@
 use OC\Cache\CappedMemoryCache;
 use OC\ServerNotAvailableException;
 use OCP\Group\Backend\IGetDisplayNameBackend;
+use OCP\Group\Backend\IDeleteGroupBackend;
 use OCP\GroupInterface;
 use Psr\Log\LoggerInterface;
 
-class Group_LDAP extends BackendUtility implements GroupInterface, IGroupLDAP, IGetDisplayNameBackend {
+class Group_LDAP extends BackendUtility implements GroupInterface, IGroupLDAP, IGetDisplayNameBackend, IDeleteGroupBackend {
 	protected $enabled = false;
 
 	/** @var string[][] $cachedGroupMembers array of users with gid as key */
@@ -1204,6 +1205,7 @@ protected function filterValidGroups(array $listOfGroups): array {
 	 */
 	public function implementsActions($actions) {
 		return (bool)((GroupInterface::COUNT_USERS |
+				GroupInterface::DELETE_GROUP |
 				$this->groupPluginManager->getImplementedActions()) & $actions);
 	}
 
@@ -1249,19 +1251,32 @@ public function createGroup($gid) {
 	 * delete a group
 	 *
 	 * @param string $gid gid of the group to delete
-	 * @return bool
 	 * @throws Exception
 	 */
-	public function deleteGroup($gid) {
-		if ($this->groupPluginManager->implementsActions(GroupInterface::DELETE_GROUP)) {
+	public function deleteGroup(string $gid): bool {
+		if ($this->groupPluginManager->canDeleteGroup()) {
 			if ($ret = $this->groupPluginManager->deleteGroup($gid)) {
-				#delete group in nextcloud internal db
+				// Delete group in nextcloud internal db
 				$this->access->getGroupMapper()->unmap($gid);
 				$this->access->connection->writeToCache("groupExists" . $gid, false);
 			}
 			return $ret;
 		}
-		throw new Exception('Could not delete group in LDAP backend.');
+
+		// Getting dn, if false the group is not mapped
+		$dn = $this->access->groupname2dn($gid);
+		if (!$dn) {
+			throw new Exception('Could not delete unknown group '.$gid.' in LDAP backend.');
+		}
+
+		if (!$this->groupExists($gid)) {
+			// The group does not exist in the LDAP, remove the mapping
+			$this->access->getGroupMapper()->unmap($gid);
+			$this->access->connection->writeToCache("groupExists" . $gid, false);
+			return true;
+		}
+
+		throw new Exception('Could not delete existing group '.$gid.' in LDAP backend.');
 	}
 
 	/**

apps/user_ldap/lib/Group_Proxy.php

@@ -28,10 +28,11 @@
  */
 namespace OCA\User_LDAP;
 
-use OCP\Group\Backend\INamedBackend;
+use OCP\Group\Backend\IDeleteGroupBackend;
 use OCP\Group\Backend\IGetDisplayNameBackend;
+use OCP\Group\Backend\INamedBackend;
 
-class Group_Proxy extends Proxy implements \OCP\GroupInterface, IGroupLDAP, IGetDisplayNameBackend, INamedBackend {
+class Group_Proxy extends Proxy implements \OCP\GroupInterface, IGroupLDAP, IGetDisplayNameBackend, INamedBackend, IDeleteGroupBackend {
 	private $backends = [];
 	private $refBackend = null;
 
@@ -171,11 +172,8 @@ public function createGroup($gid) {
 
 	/**
 	 * delete a group
-	 *
-	 * @param string $gid gid of the group to delete
-	 * @return bool
 	 */
-	public function deleteGroup($gid) {
+	public function deleteGroup(string $gid): bool {
 		return $this->handleRequest(
 			$gid, 'deleteGroup', [$gid]);
 	}

apps/user_ldap/lib/UserPluginManager.php

@@ -28,9 +28,9 @@
 use OC\User\Backend;
 
 class UserPluginManager {
-	private $respondToActions = 0;
+	private int $respondToActions = 0;
 
-	private $which = [
+	private array $which = [
 		Backend::CREATE_USER => null,
 		Backend::SET_PASSWORD => null,
 		Backend::GET_HOME => null,
@@ -41,8 +41,7 @@ class UserPluginManager {
 		'deleteUser' => null
 	];
 
-	/** @var bool */
-	private $suppressDeletion = false;
+	private bool $suppressDeletion = false;
 
 	/**
 	 * @return int All implemented actions, except for 'deleteUser'

apps/user_ldap/tests/GroupLDAPPluginTest.php

@@ -84,7 +84,7 @@ public function testCreateGroup() {
 		$pluginManager->createGroup('group');
 	}
 
-	
+
 	public function testCreateGroupNotRegistered() {
 		$this->expectException(\Exception::class);
 		$this->expectExceptionMessage('No plugin implements createGroup in this LDAP Backend.');
@@ -108,13 +108,13 @@ public function testDeleteGroup() {
 			->method('deleteGroup')
 			->with(
 				$this->equalTo('group')
-			);
+			)->willReturn(true);
 
 		$pluginManager->register($plugin);
-		$pluginManager->deleteGroup('group');
+		$this->assertTrue($pluginManager->deleteGroup('group'));
 	}
 
-	
+
 	public function testDeleteGroupNotRegistered() {
 		$this->expectException(\Exception::class);
 		$this->expectExceptionMessage('No plugin implements deleteGroup in this LDAP Backend.');
@@ -145,7 +145,7 @@ public function testAddToGroup() {
 		$pluginManager->addToGroup('uid', 'gid');
 	}
 
-	
+
 	public function testAddToGroupNotRegistered() {
 		$this->expectException(\Exception::class);
 		$this->expectExceptionMessage('No plugin implements addToGroup in this LDAP Backend.');
@@ -176,7 +176,7 @@ public function testRemoveFromGroup() {
 		$pluginManager->removeFromGroup('uid', 'gid');
 	}
 
-	
+
 	public function testRemoveFromGroupNotRegistered() {
 		$this->expectException(\Exception::class);
 		$this->expectExceptionMessage('No plugin implements removeFromGroup in this LDAP Backend.');
@@ -207,7 +207,7 @@ public function testCountUsersInGroup() {
 		$pluginManager->countUsersInGroup('gid', 'search');
 	}
 
-	
+
 	public function testCountUsersInGroupNotRegistered() {
 		$this->expectException(\Exception::class);
 		$this->expectExceptionMessage('No plugin implements countUsersInGroup in this LDAP Backend.');
@@ -237,7 +237,7 @@ public function testgetGroupDetails() {
 		$pluginManager->getGroupDetails('gid');
 	}
 
-	
+
 	public function testgetGroupDetailsNotRegistered() {
 		$this->expectException(\Exception::class);
 		$this->expectExceptionMessage('No plugin implements getGroupDetails in this LDAP Backend.');

apps/user_ldap/tests/Group_LDAPTest.php

@@ -1092,7 +1092,7 @@ public function testDeleteGroupWithPlugin() {
 		$pluginManager->expects($this->once())
 			->method('deleteGroup')
 			->with('gid')
-			->willReturn('result');
+			->willReturn(true);
 
 		$mapper = $this->getMockBuilder(GroupMapping::class)
 			->setMethods(['unmap'])
@@ -1108,7 +1108,7 @@ public function testDeleteGroupWithPlugin() {
 
 		$ldap = new GroupLDAP($access, $pluginManager);
 
-		$this->assertEquals($ldap->deleteGroup('gid'), 'result');
+		$this->assertTrue($ldap->deleteGroup('gid'));
 	}
 
 

core/Command/Group/Delete.php

@@ -61,7 +61,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 			$output->writeln('<error>Group "' . $gid . '" could not be deleted.</error>');
 			return 1;
 		}
-		if (! $this->groupManager->groupExists($gid)) {
+		if (!$this->groupManager->groupExists($gid)) {
 			$output->writeln('<error>Group "' . $gid . '" does not exist.</error>');
 			return 1;
 		}