nextcloud-server/tests/lib/Encryption/Keys/StorageTest.php

<?php

/**
 * SPDX-FileCopyrightText: 2017-2024 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace Test\Encryption\Keys;

use OC\Encryption\Keys\Storage;
use OC\Files\View;
use OCP\IConfig;
use OCP\Security\ICrypto;
use PHPUnit\Framework\MockObject\MockObject;
use Test\TestCase;

class StorageTest extends TestCase {
	/** @var Storage */
	protected $storage;

	/** @var MockObject|\OC\Encryption\Util */
	protected $util;

	/** @var MockObject|View */
	protected $view;

	/** @var MockObject|IConfig */
	protected $config;

	/** @var MockObject|ICrypto */
	protected $crypto;

	private array $mkdirStack = [];

	protected function setUp(): void {
		parent::setUp();

		$this->util = $this->getMockBuilder('OC\Encryption\Util')
			->disableOriginalConstructor()
			->setMethodsExcept(['getFileKeyDir'])
			->getMock();

		$this->view = $this->getMockBuilder(View::class)
			->disableOriginalConstructor()
			->getMock();

		$this->crypto = $this->createMock(ICrypto::class);
		$this->crypto->method('encrypt')
			->willReturnCallback(function ($data, $pass) {
				return $data;
			});
		$this->crypto->method('decrypt')
			->willReturnCallback(function ($data, $pass) {
				return $data;
			});

		$this->config = $this->getMockBuilder(IConfig::class)
			->disableOriginalConstructor()
			->getMock();

		$this->storage = new Storage($this->view, $this->util, $this->crypto, $this->config);
	}

	public function testSetFileKey() {
		$this->config->method('getSystemValueString')
			->with('version')
			->willReturn('20.0.0.2');
		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturn(['user1', '/files/foo.txt']);
		$this->util->expects($this->any())
			->method('stripPartialFileExtension')
			->willReturnArgument(0);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturn(false);

		$data = json_encode(['key' => base64_encode('key')]);
		$this->view->expects($this->once())
			->method('file_put_contents')
			->with($this->equalTo('/user1/files_encryption/keys/files/foo.txt/encModule/fileKey'),
				$this->equalTo($data))
			->willReturn(strlen($data));

		$this->assertTrue(
			$this->storage->setFileKey('user1/files/foo.txt', 'fileKey', 'key', 'encModule')
		);
	}

	public function testSetFileOld() {
		$this->config->method('getSystemValueString')
			->with('version')
			->willReturn('20.0.0.0');
		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturn(['user1', '/files/foo.txt']);
		$this->util->expects($this->any())
			->method('stripPartialFileExtension')
			->willReturnArgument(0);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturn(false);
		$this->crypto->expects($this->never())
			->method('encrypt');
		$this->view->expects($this->once())
			->method('file_put_contents')
			->with($this->equalTo('/user1/files_encryption/keys/files/foo.txt/encModule/fileKey'),
				$this->equalTo('key'))
			->willReturn(strlen('key'));

		$this->assertTrue(
			$this->storage->setFileKey('user1/files/foo.txt', 'fileKey', 'key', 'encModule')
		);
	}

	public function dataTestGetFileKey() {
		return [
			['/files/foo.txt', '/files/foo.txt', true, 'key'],
			['/files/foo.txt.ocTransferId2111130212.part', '/files/foo.txt', true, 'key'],
			['/files/foo.txt.ocTransferId2111130212.part', '/files/foo.txt', false, 'key2'],
		];
	}

	/**
	 * @dataProvider dataTestGetFileKey
	 *
	 * @param string $path
	 * @param string $strippedPartialName
	 * @param bool $originalKeyExists
	 * @param string $expectedKeyContent
	 */
	public function testGetFileKey($path, $strippedPartialName, $originalKeyExists, $expectedKeyContent) {
		$this->config->method('getSystemValueString')
			->with('version')
			->willReturn('20.0.0.2');
		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturnMap([
				['user1/files/foo.txt', ['user1', '/files/foo.txt']],
				['user1/files/foo.txt.ocTransferId2111130212.part', ['user1', '/files/foo.txt.ocTransferId2111130212.part']],
			]);
		// we need to strip away the part file extension in order to reuse a
		// existing key if it exists, otherwise versions will break
		$this->util->expects($this->once())
			->method('stripPartialFileExtension')
			->willReturn('user1' . $strippedPartialName);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturn(false);

		$this->crypto->method('decrypt')
			->willReturnCallback(function ($data, $pass) {
				return $data;
			});

		if (!$originalKeyExists) {
			$this->view->expects($this->exactly(2))
				->method('file_exists')
				->withConsecutive(
					[$this->equalTo('/user1/files_encryption/keys' . $strippedPartialName . '/encModule/fileKey')],
					[$this->equalTo('/user1/files_encryption/keys' . $path . '/encModule/fileKey')],
				)->willReturnOnConsecutiveCalls(
					$originalKeyExists,
					true,
				);

			$this->view->expects($this->once())
				->method('file_get_contents')
				->with($this->equalTo('/user1/files_encryption/keys' . $path . '/encModule/fileKey'))
				->willReturn(json_encode(['key' => base64_encode('key2')]));
		} else {
			$this->view->expects($this->once())
				->method('file_exists')
				->with($this->equalTo('/user1/files_encryption/keys' . $strippedPartialName . '/encModule/fileKey'))
				->willReturn($originalKeyExists);

			$this->view->expects($this->once())
				->method('file_get_contents')
				->with($this->equalTo('/user1/files_encryption/keys' . $strippedPartialName . '/encModule/fileKey'))
				->willReturn(json_encode(['key' => base64_encode('key')]));
		}

		$this->assertSame($expectedKeyContent,
			$this->storage->getFileKey('user1' . $path, 'fileKey', 'encModule')
		);
	}

	public function testSetFileKeySystemWide() {
		$this->config->method('getSystemValueString')
			->with('version')
			->willReturn('20.0.0.2');

		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturn(['user1', '/files/foo.txt']);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturn(true);
		$this->util->expects($this->any())
			->method('stripPartialFileExtension')
			->willReturnArgument(0);

		$this->crypto->method('encrypt')
			->willReturnCallback(function ($data, $pass) {
				return $data;
			});

		$data = json_encode(['key' => base64_encode('key')]);
		$this->view->expects($this->once())
			->method('file_put_contents')
			->with($this->equalTo('/files_encryption/keys/files/foo.txt/encModule/fileKey'),
				$this->equalTo($data))
			->willReturn(strlen($data));

		$this->assertTrue(
			$this->storage->setFileKey('user1/files/foo.txt', 'fileKey', 'key', 'encModule')
		);
	}

	public function testGetFileKeySystemWide() {
		$this->config->method('getSystemValueString')
			->with('version')
			->willReturn('20.0.0.2');

		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturn(['user1', '/files/foo.txt']);
		$this->util->expects($this->any())
			->method('stripPartialFileExtension')
			->willReturnArgument(0);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturn(true);
		$this->view->expects($this->once())
			->method('file_get_contents')
			->with($this->equalTo('/files_encryption/keys/files/foo.txt/encModule/fileKey'))
			->willReturn(json_encode(['key' => base64_encode('key')]));
		$this->view->expects($this->once())
			->method('file_exists')
			->with($this->equalTo('/files_encryption/keys/files/foo.txt/encModule/fileKey'))
			->willReturn(true);

		$this->assertSame('key',
			$this->storage->getFileKey('user1/files/foo.txt', 'fileKey', 'encModule')
		);
	}

	public function testSetSystemUserKey() {
		$this->config->method('getSystemValueString')
			->with('version')
			->willReturn('20.0.0.2');

		$data = json_encode([
			'key' => base64_encode('key'),
			'uid' => null]
		);
		$this->view->expects($this->once())
			->method('file_put_contents')
			->with($this->equalTo('/files_encryption/encModule/shareKey_56884'),
				$this->equalTo($data))
			->willReturn(strlen($data));

		$this->assertTrue(
			$this->storage->setSystemUserKey('shareKey_56884', 'key', 'encModule')
		);
	}

	public function testSetUserKey() {
		$this->config->method('getSystemValueString')
			->with('version')
			->willReturn('20.0.0.2');

		$data = json_encode([
			'key' => base64_encode('key'),
			'uid' => 'user1']
		);
		$this->view->expects($this->once())
			->method('file_put_contents')
			->with($this->equalTo('/user1/files_encryption/encModule/user1.publicKey'),
				$this->equalTo($data))
			->willReturn(strlen($data));

		$this->assertTrue(
			$this->storage->setUserKey('user1', 'publicKey', 'key', 'encModule')
		);
	}

	public function testGetSystemUserKey() {
		$this->config->method('getSystemValueString')
			->with('version')
			->willReturn('20.0.0.2');

		$data = json_encode([
			'key' => base64_encode('key'),
			'uid' => null]
		);
		$this->view->expects($this->once())
			->method('file_get_contents')
			->with($this->equalTo('/files_encryption/encModule/shareKey_56884'))
			->willReturn($data);
		$this->view->expects($this->once())
			->method('file_exists')
			->with($this->equalTo('/files_encryption/encModule/shareKey_56884'))
			->willReturn(true);

		$this->assertSame('key',
			$this->storage->getSystemUserKey('shareKey_56884', 'encModule')
		);
	}

	public function testGetUserKey() {
		$this->config->method('getSystemValueString')
			->with('version')
			->willReturn('20.0.0.2');

		$data = json_encode([
			'key' => base64_encode('key'),
			'uid' => 'user1']
		);
		$this->view->expects($this->once())
			->method('file_get_contents')
			->with($this->equalTo('/user1/files_encryption/encModule/user1.publicKey'))
			->willReturn($data);
		$this->view->expects($this->once())
			->method('file_exists')
			->with($this->equalTo('/user1/files_encryption/encModule/user1.publicKey'))
			->willReturn(true);

		$this->assertSame('key',
			$this->storage->getUserKey('user1', 'publicKey', 'encModule')
		);
	}

	public function testDeleteUserKey() {
		$this->view->expects($this->once())
			->method('file_exists')
			->with($this->equalTo('/user1/files_encryption/encModule/user1.publicKey'))
			->willReturn(true);
		$this->view->expects($this->once())
			->method('unlink')
			->with($this->equalTo('/user1/files_encryption/encModule/user1.publicKey'))
			->willReturn(true);

		$this->assertTrue(
			$this->storage->deleteUserKey('user1', 'publicKey', 'encModule')
		);
	}

	public function testDeleteSystemUserKey() {
		$this->view->expects($this->once())
			->method('file_exists')
			->with($this->equalTo('/files_encryption/encModule/shareKey_56884'))
			->willReturn(true);
		$this->view->expects($this->once())
			->method('unlink')
			->with($this->equalTo('/files_encryption/encModule/shareKey_56884'))
			->willReturn(true);

		$this->assertTrue(
			$this->storage->deleteSystemUserKey('shareKey_56884', 'encModule')
		);
	}

	public function testDeleteFileKeySystemWide() {
		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturn(['user1', '/files/foo.txt']);
		$this->util->expects($this->any())
			->method('stripPartialFileExtension')
			->willReturnArgument(0);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturn(true);
		$this->view->expects($this->once())
			->method('file_exists')
			->with($this->equalTo('/files_encryption/keys/files/foo.txt/encModule/fileKey'))
			->willReturn(true);
		$this->view->expects($this->once())
			->method('unlink')
			->with($this->equalTo('/files_encryption/keys/files/foo.txt/encModule/fileKey'))
			->willReturn(true);

		$this->assertTrue(
			$this->storage->deleteFileKey('user1/files/foo.txt', 'fileKey', 'encModule')
		);
	}

	public function testDeleteFileKey() {
		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturn(['user1', '/files/foo.txt']);
		$this->util->expects($this->any())
			->method('stripPartialFileExtension')
			->willReturnArgument(0);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturn(false);
		$this->view->expects($this->once())
			->method('file_exists')
			->with($this->equalTo('/user1/files_encryption/keys/files/foo.txt/encModule/fileKey'))
			->willReturn(true);
		$this->view->expects($this->once())
			->method('unlink')
			->with($this->equalTo('/user1/files_encryption/keys/files/foo.txt/encModule/fileKey'))
			->willReturn(true);

		$this->assertTrue(
			$this->storage->deleteFileKey('user1/files/foo.txt', 'fileKey', 'encModule')
		);
	}

	/**
	 * @dataProvider dataProviderCopyRename
	 */
	public function testRenameKeys($source, $target, $systemWideMountSource, $systemWideMountTarget, $expectedSource, $expectedTarget) {
		$this->view->expects($this->any())
			->method('file_exists')
			->willReturn(true);
		$this->view->expects($this->any())
			->method('is_dir')
			->willReturn(true);
		$this->view->expects($this->once())
			->method('rename')
			->with(
				$this->equalTo($expectedSource),
				$this->equalTo($expectedTarget))
			->willReturn(true);
		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturnCallback([$this, 'getUidAndFilenameCallback']);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturnCallback(function ($path, $owner) use ($systemWideMountSource, $systemWideMountTarget) {
				if (strpos($path, 'source.txt') !== false) {
					return $systemWideMountSource;
				}
				return $systemWideMountTarget;
			});

		$this->storage->renameKeys($source, $target);
	}

	/**
	 * @dataProvider dataProviderCopyRename
	 */
	public function testCopyKeys($source, $target, $systemWideMountSource, $systemWideMountTarget, $expectedSource, $expectedTarget) {
		$this->view->expects($this->any())
			->method('file_exists')
			->willReturn(true);
		$this->view->expects($this->any())
			->method('is_dir')
			->willReturn(true);
		$this->view->expects($this->once())
			->method('copy')
			->with(
				$this->equalTo($expectedSource),
				$this->equalTo($expectedTarget))
			->willReturn(true);
		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturnCallback([$this, 'getUidAndFilenameCallback']);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturnCallback(function ($path, $owner) use ($systemWideMountSource, $systemWideMountTarget) {
				if (strpos($path, 'source.txt') !== false) {
					return $systemWideMountSource;
				}
				return $systemWideMountTarget;
			});

		$this->storage->copyKeys($source, $target);
	}

	public function getUidAndFilenameCallback() {
		$args = func_get_args();

		$path = $args[0];
		$parts = explode('/', $path);

		return [$parts[1], '/' . implode('/', array_slice($parts, 2))];
	}

	public function dataProviderCopyRename() {
		return [
			['/user1/files/source.txt', '/user1/files/target.txt', false, false,
				'/user1/files_encryption/keys/files/source.txt/', '/user1/files_encryption/keys/files/target.txt/'],
			['/user1/files/foo/source.txt', '/user1/files/target.txt', false, false,
				'/user1/files_encryption/keys/files/foo/source.txt/', '/user1/files_encryption/keys/files/target.txt/'],
			['/user1/files/source.txt', '/user1/files/foo/target.txt', false, false,
				'/user1/files_encryption/keys/files/source.txt/', '/user1/files_encryption/keys/files/foo/target.txt/'],
			['/user1/files/source.txt', '/user1/files/foo/target.txt', true, true,
				'/files_encryption/keys/files/source.txt/', '/files_encryption/keys/files/foo/target.txt/'],
			['/user1/files/source.txt', '/user1/files/target.txt', false, true,
				'/user1/files_encryption/keys/files/source.txt/', '/files_encryption/keys/files/target.txt/'],
			['/user1/files/source.txt', '/user1/files/target.txt', true, false,
				'/files_encryption/keys/files/source.txt/', '/user1/files_encryption/keys/files/target.txt/'],

			['/user2/files/source.txt', '/user1/files/target.txt', false, false,
				'/user2/files_encryption/keys/files/source.txt/', '/user1/files_encryption/keys/files/target.txt/'],
			['/user2/files/foo/source.txt', '/user1/files/target.txt', false, false,
				'/user2/files_encryption/keys/files/foo/source.txt/', '/user1/files_encryption/keys/files/target.txt/'],
			['/user2/files/source.txt', '/user1/files/foo/target.txt', false, false,
				'/user2/files_encryption/keys/files/source.txt/', '/user1/files_encryption/keys/files/foo/target.txt/'],
			['/user2/files/source.txt', '/user1/files/foo/target.txt', true, true,
				'/files_encryption/keys/files/source.txt/', '/files_encryption/keys/files/foo/target.txt/'],
			['/user2/files/source.txt', '/user1/files/target.txt', false, true,
				'/user2/files_encryption/keys/files/source.txt/', '/files_encryption/keys/files/target.txt/'],
			['/user2/files/source.txt', '/user1/files/target.txt', true, false,
				'/files_encryption/keys/files/source.txt/', '/user1/files_encryption/keys/files/target.txt/'],
		];
	}

	/**
	 * @dataProvider dataTestGetPathToKeys
	 *
	 * @param string $path
	 * @param boolean $systemWideMountPoint
	 * @param string $storageRoot
	 * @param string $expected
	 */
	public function testGetPathToKeys($path, $systemWideMountPoint, $storageRoot, $expected) {
		$this->invokePrivate($this->storage, 'root_dir', [$storageRoot]);

		$this->util->expects($this->any())
			->method('getUidAndFilename')
			->willReturnCallback([$this, 'getUidAndFilenameCallback']);
		$this->util->expects($this->any())
			->method('isSystemWideMountPoint')
			->willReturn($systemWideMountPoint);

		$this->assertSame($expected,
			self::invokePrivate($this->storage, 'getPathToKeys', [$path])
		);
	}

	public function dataTestGetPathToKeys() {
		return [
			['/user1/files/source.txt', false, '', '/user1/files_encryption/keys/files/source.txt/'],
			['/user1/files/source.txt', true, '', '/files_encryption/keys/files/source.txt/'],
			['/user1/files/source.txt', false, 'storageRoot', '/storageRoot/user1/files_encryption/keys/files/source.txt/'],
			['/user1/files/source.txt', true, 'storageRoot', '/storageRoot/files_encryption/keys/files/source.txt/'],
		];
	}

	public function testKeySetPreparation() {
		$this->view->expects($this->any())
			->method('file_exists')
			->willReturn(false);
		$this->view->expects($this->any())
			->method('is_dir')
			->willReturn(false);
		$this->view->expects($this->any())
			->method('mkdir')
			->willReturnCallback([$this, 'mkdirCallback']);

		$this->mkdirStack = [
			'/user1/files_encryption/keys/foo',
			'/user1/files_encryption/keys',
			'/user1/files_encryption',
			'/user1'];

		self::invokePrivate($this->storage, 'keySetPreparation', ['/user1/files_encryption/keys/foo']);
	}

	public function mkdirCallback() {
		$args = func_get_args();
		$expected = array_pop($this->mkdirStack);
		$this->assertSame($expected, $args[0]);
	}


	/**
	 * @dataProvider dataTestBackupUserKeys
	 * @param bool $createBackupDir
	 */
	public function testBackupUserKeys($createBackupDir) {
		$storage = $this->getMockBuilder('OC\Encryption\Keys\Storage')
			->setConstructorArgs([$this->view, $this->util, $this->crypto, $this->config])
			->setMethods(['getTimestamp'])
			->getMock();

		$storage->expects($this->any())->method('getTimestamp')->willReturn('1234567');

		$this->view->expects($this->once())->method('file_exists')
			->with('user1/files_encryption/backup')->willReturn(!$createBackupDir);

		if ($createBackupDir) {
			$this->view->expects($this->exactly(2))->method('mkdir')
				->withConsecutive(
					['user1/files_encryption/backup'],
					['user1/files_encryption/backup/test.encryptionModule.1234567'],
				);
		} else {
			$this->view->expects($this->once())->method('mkdir')
				->with('user1/files_encryption/backup/test.encryptionModule.1234567');
		}

		$this->view->expects($this->once())->method('copy')
			->with(
				'user1/files_encryption/encryptionModule',
				'user1/files_encryption/backup/test.encryptionModule.1234567'
			)->willReturn(true);

		$this->assertTrue($storage->backupUserKeys('encryptionModule', 'test', 'user1'));
	}

	public function dataTestBackupUserKeys() {
		return [
			[true], [false]
		];
	}
}