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See Release Notes

  • Bug fixes for general core bugs in 3.10.x will end 8 November 2021 (12 months).
  • Bug fixes for security issues in 3.10.x will end 9 May 2022 (18 months).
  • PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Tests for the handling of encrypted contents in backup and restore.
 *
 * @package core_backup
 * @copyright 2016 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

global $CFG;
require_once($CFG->dirroot . '/backup/util/includes/backup_includes.php');
require_once($CFG->dirroot . '/backup/util/includes/restore_includes.php');
require_once($CFG->dirroot . '/backup/moodle2/backup_custom_fields.php');

class core_backup_encrypted_content_testscase extends advanced_testcase {

< public function setUp() {
> public function setUp(): void {
if (!function_exists('openssl_encrypt')) { $this->markTestSkipped('OpenSSL extension is not loaded.'); } else if (!function_exists('hash_hmac')) { $this->markTestSkipped('Hash extension is not loaded.'); } else if (!in_array(backup::CIPHER, openssl_get_cipher_methods())) { $this->markTestSkipped('Expected cipher not available: ' . backup::CIPHER); } } public function test_encrypted_final_element() { $this->resetAfterTest(true); // Some basic verifications. $efe = new encrypted_final_element('test', array('encrypted')); $this->assertInstanceOf('encrypted_final_element', $efe); $this->assertSame('test', $efe->get_name()); $atts = $efe->get_attributes(); $this->assertCount(1, $atts); $att = reset($atts); $this->assertInstanceOf('backup_attribute', $att); $this->assertSame('encrypted', $att->get_name()); // Using a manually defined (incorrect length) key. $efe = new encrypted_final_element('test', array('encrypted')); $key = 'this_in_not_correct_32_byte_key'; try { set_config('backup_encryptkey', base64_encode($key), 'backup'); $efe->set_value('tiny_secret'); $this->fail('Expecting base_element_struct_exception exception, none happened'); } catch (exception $e) { $this->assertInstanceOf('base_element_struct_exception', $e); $this->assertEquals('encrypted_final_element incorrect key length', $e->errorcode); } // Using a manually defined (correct length) key. $efe = new encrypted_final_element('test', array('testattr', 'encrypted')); $key = hash('md5', 'Moodle rocks and this is not secure key, who cares, it is a test'); set_config('backup_encryptkey', base64_encode($key), 'backup'); $this->assertEmpty($efe->get_value()); $secret = 'This is a secret message that nobody else will be able to read but me 💩 '; $efe->set_value($secret); $atts = $efe->get_attributes(); $this->assertCount(2, $atts); $this->assertArrayHasKey('encrypted', $atts); // We added it explicitly. $this->assertTrue($atts['encrypted']->is_set()); $this->assertSame('true', $atts['encrypted']->get_value()); $this->assertNotEmpty($efe->get_value()); $this->assertTrue($efe->is_set()); // Get the crypted content and decrypt it manually. $ctext = $efe->get_value(); $hmaclen = 32; // SHA256 is 32 bytes. $ivlen = openssl_cipher_iv_length(backup::CIPHER); list($hmac, $iv, $text) = array_values(unpack("a{$hmaclen}hmac/a{$ivlen}iv/a*text", base64_decode($ctext))); $this->assertSame(hash_hmac('sha256', $iv . $text, $key, true), $hmac); $this->assertSame($secret, openssl_decrypt($text, backup::CIPHER, $key, OPENSSL_RAW_DATA, $iv)); // Using the default site-generated key. $efe = new encrypted_final_element('test', array('testattr')); $this->assertEmpty($efe->get_value()); $secret = 'This is a secret message that nobody else will be able to read but me 💩 '; $efe->set_value($secret); $atts = $efe->get_attributes(); $this->assertCount(2, $atts); $this->assertArrayHasKey('encrypted', $atts); // Was added automatcally, we did not specify it. $this->assertTrue($atts['encrypted']->is_set()); $this->assertSame('true', $atts['encrypted']->get_value()); $this->assertNotEmpty($efe->get_value()); $this->assertTrue($efe->is_set()); // Get the crypted content and decrypt it manually. $ctext = $efe->get_value(); $hmaclen = 32; // SHA256 is 32 bytes. $ivlen = openssl_cipher_iv_length(backup::CIPHER); list($hmac, $iv, $text) = array_values(unpack("a{$hmaclen}hmac/a{$ivlen}iv/a*text", base64_decode($ctext))); $key = base64_decode(get_config('backup', 'backup_encryptkey')); $this->assertSame(hash_hmac('sha256', $iv . $text, $key, true), $hmac); $this->assertSame($secret, openssl_decrypt($text, backup::CIPHER, $key, OPENSSL_RAW_DATA, $iv)); } }