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<?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/>. namespace core; use advanced_testcase; /** * Test encryption. * * @package core * @copyright 2020 The Open University * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later * @covers \core\encryption / class encryption_test extends advanced_testcase { /* * Clear junk created by tests. / protected function tearDown(): void { global $CFG; $keyfile = encryption::get_key_file(encryption::METHOD_OPENSSL); if (file_exists($keyfile)) { chmod($keyfile, 0700); } $keyfile = encryption::get_key_file(encryption::METHOD_SODIUM); if (file_exists($keyfile)) { chmod($keyfile, 0700); } remove_dir($CFG->dataroot . '/secret'); unset($CFG->nokeygeneration); } protected function setUp(): void { $this->tearDown(); require_once(__DIR__ . '/fixtures/testable_encryption.php'); } /* * Many of the tests work with both encryption methods. * * @return array[] Array of method options for test / public function encryption_method_provider(): array { return [ 'Sodium' => [encryption::METHOD_SODIUM], ]; } /* * Tests the create_keys and get_key functions. * * @param string $method Encryption method * @dataProvider encryption_method_provider / public function test_create_key(string $method): void { encryption::create_key($method); $key = testable_encryption::get_key($method); $this->assertEquals(32, strlen($key)); $this->expectExceptionMessage('Key already exists'); encryption::create_key($method); } /* * Test that we can create keys for legacy {@see encryption::METHOD_OPENSSL} content / public function test_create_key_openssl(): void { encryption::create_key(encryption::METHOD_OPENSSL); $key = testable_encryption::get_key(encryption::METHOD_OPENSSL); $this->assertEquals(32, strlen($key)); $this->expectExceptionMessage('Key already exists'); encryption::create_key(encryption::METHOD_OPENSSL); } /* * Tests encryption and decryption with empty strings. / public function test_encrypt_and_decrypt_empty(): void { $this->assertEquals('', encryption::encrypt('')); $this->assertEquals('', encryption::decrypt('')); } /* * Tests encryption when the keys weren't created yet. * * @param string $method Encryption method * @dataProvider encryption_method_provider / public function test_encrypt_nokeys(string $method): void { global $CFG; // Prevent automatic generation of keys. $CFG->nokeygeneration = true; $this->expectExceptionMessage('Key not found'); encryption::encrypt('frogs', $method); } /* * Test that attempting to encrypt with legacy {@see encryption::METHOD_OPENSSL} method falls back to Sodium / public function test_encrypt_openssl(): void { $encrypted = encryption::encrypt('Frogs', encryption::METHOD_OPENSSL); $this->assertStringStartsWith(encryption::METHOD_SODIUM . ':', $encrypted); $this->assertDebuggingCalledCount(1, ['Encryption using legacy OpenSSL is deprecated, reverting to Sodium']); } /* * Tests decryption when the data has a different encryption method / public function test_decrypt_wrongmethod(): void { $this->expectExceptionMessage('Data does not match a supported encryption method'); encryption::decrypt('FAKE-CIPHER-METHOD:xx'); } /* * Tests decryption when not enough data is supplied to get the IV and some data. * * @dataProvider encryption_method_provider * @param string $method Encryption method / public function test_decrypt_tooshort(string $method): void { $this->expectExceptionMessage('Insufficient data'); switch ($method) { case encryption::METHOD_OPENSSL: // It needs min 49 bytes (16 bytes IV + 32 bytes HMAC + 1 byte data). $justtooshort = '0123456789abcdef0123456789abcdef0123456789abcdef'; break; case encryption::METHOD_SODIUM: // Sodium needs 25 bytes at least as far as our code is concerned (24 bytes IV + 1 // byte data); it splits out any authentication hashes itself. $justtooshort = '0123456789abcdef01234567'; break; } encryption::decrypt($method . ':' .base64_encode($justtooshort)); } /* * Tests decryption when data is not valid base64. * * @dataProvider encryption_method_provider * @param string $method Encryption method / public function test_decrypt_notbase64(string $method): void { $this->expectExceptionMessage('Invalid base64 data'); encryption::decrypt($method . ':' . chr(160)); } /* * Tests decryption when the keys weren't created yet. * * @dataProvider encryption_method_provider * @param string $method Encryption method / public function test_decrypt_nokeys(string $method): void { global $CFG; // Prevent automatic generation of keys. $CFG->nokeygeneration = true; $this->expectExceptionMessage('Key not found'); encryption::decrypt($method . ':' . base64_encode( '0123456789abcdef0123456789abcdef0123456789abcdef0')); } /* * Test that we can decrypt legacy {@see encryption::METHOD_OPENSSL} content / public function test_decrypt_openssl(): void { $key = testable_encryption::get_key(encryption::METHOD_OPENSSL); // Construct encrypted string using openssl method/cipher. $iv = random_bytes(openssl_cipher_iv_length(encryption::OPENSSL_CIPHER)); $encrypted = @openssl_encrypt('Frogs', encryption::OPENSSL_CIPHER, $key, OPENSSL_RAW_DATA, $iv); $hmac = hash_hmac('sha256', $iv . $encrypted, $key, true); $decrypted = encryption::decrypt(encryption::METHOD_OPENSSL . ':' . base64_encode($iv . $encrypted . $hmac)); $this->assertEquals('Frogs', $decrypted); $this->assertDebuggingCalledCount(1, ['Decryption using legacy OpenSSL is deprecated, please upgrade to Sodium']); } /* * Test automatic generation of keys when needed. * * @dataProvider encryption_method_provider * @param string $method Encryption method / public function test_auto_key_generation(string $method): void { // Allow automatic generation (default). $encrypted = encryption::encrypt('frogs', $method); $this->assertEquals('frogs', encryption::decrypt($encrypted)); } /* * Checks that invalid key causes failures. * * @dataProvider encryption_method_provider * @param string $method Encryption method / public function test_invalid_key(string $method): void { global $CFG; // Set the key to something bogus. $folder = $CFG->dataroot . '/secret/key'; check_dir_exists($folder); file_put_contents(encryption::get_key_file($method), 'silly'); switch ($method) { case encryption::METHOD_SODIUM: $this->expectExceptionMessageMatches('/(should\|must) be SODIUM_CRYPTO_SECRETBOX_KEYBYTES bytes/'); break; case encryption::METHOD_OPENSSL: $this->expectExceptionMessage('Invalid key'); break; } encryption::encrypt('frogs', $method); } /* * Checks that modified data causes failures. * * @dataProvider encryption_method_provider * @param string $method Encryption method / public function test_modified_data(string $method): void { $encrypted = encryption::encrypt('frogs', $method); $mainbit = base64_decode(substr($encrypted, strlen($method) + 1)); $mainbit = substr($mainbit, 0, 16) . 'X' . substr($mainbit, 16); $encrypted = $method . ':' . base64_encode($mainbit); $this->expectExceptionMessage('Integrity check failed'); encryption::decrypt($encrypted); } /* * Tests encryption and decryption for real. * * @dataProvider encryption_method_provider * @param string $method Encryption method / public function test_encrypt_and_decrypt_realdata(string $method): void { // Encrypt short string. $encrypted = encryption::encrypt('frogs', $method); $this->assertNotEquals('frogs', $encrypted); $this->assertEquals('frogs', encryption::decrypt($encrypted)); // Encrypt really long string (1 MB). $long = str_repeat('X', 1024 1024); $this->assertEquals($long, encryption::decrypt(encryption::encrypt($long, $method))); } }

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