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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Bundle\FrameworkBundle\Secrets;
use Symfony\Component\DependencyInjection\EnvVarLoaderInterface;
use Symfony\Component\VarExporter\VarExporter;
/**
* @author Tobias Schultze <http://tobion.de>
* @author Jérémy Derussé <[email protected]>
* @author Nicolas Grekas <[email protected]>
*
* @internal
*/
class SodiumVault extends AbstractVault implements EnvVarLoaderInterface
{
private $encryptionKey;
private $decryptionKey;
private $pathPrefix;
private $secretsDir;
/**
* @param string|\Stringable|null $decryptionKey A string or a stringable object that defines the private key to use to decrypt the vault
* or null to store generated keys in the provided $secretsDir
*/
public function __construct(string $secretsDir, $decryptionKey = null)
{
if (null !== $decryptionKey && !\is_string($decryptionKey) && !(\is_object($decryptionKey) && method_exists($decryptionKey, '__toString'))) {
throw new \TypeError(sprintf('Decryption key should be a string or an object that implements the __toString() method, "%s" given.', get_debug_type($decryptionKey)));
}
$this->pathPrefix = rtrim(strtr($secretsDir, '/', \DIRECTORY_SEPARATOR), \DIRECTORY_SEPARATOR).\DIRECTORY_SEPARATOR.basename($secretsDir).'.';
$this->decryptionKey = $decryptionKey;
$this->secretsDir = $secretsDir;
}
public function generateKeys(bool $override = false): bool
{
$this->lastMessage = null;
if (null === $this->encryptionKey && '' !== $this->decryptionKey = (string) $this->decryptionKey) {
$this->lastMessage = 'Cannot generate keys when a decryption key has been provided while instantiating the vault.';
return false;
}
try {
$this->loadKeys();
} catch (\RuntimeException $e) {
// ignore failures to load keys
}
if ('' !== $this->decryptionKey && !is_file($this->pathPrefix.'encrypt.public.php')) {
$this->export('encrypt.public', $this->encryptionKey);
}
if (!$override && null !== $this->encryptionKey) {
$this->lastMessage = sprintf('Sodium keys already exist at "%s*.{public,private}" and won\'t be overridden.', $this->getPrettyPath($this->pathPrefix));
return false;
}
$this->decryptionKey = sodium_crypto_box_keypair();
$this->encryptionKey = sodium_crypto_box_publickey($this->decryptionKey);
$this->export('encrypt.public', $this->encryptionKey);
$this->export('decrypt.private', $this->decryptionKey);
$this->lastMessage = sprintf('Sodium keys have been generated at "%s*.public/private.php".', $this->getPrettyPath($this->pathPrefix));
return true;
}
public function seal(string $name, string $value): void
{
$this->lastMessage = null;
$this->validateName($name);
$this->loadKeys();
$filename = $this->getFilename($name);
$this->export($filename, sodium_crypto_box_seal($value, $this->encryptionKey ?? sodium_crypto_box_publickey($this->decryptionKey)));
$list = $this->list();
$list[$name] = null;
uksort($list, 'strnatcmp');
file_put_contents($this->pathPrefix.'list.php', sprintf("<?php\n\nreturn %s;\n", VarExporter::export($list)), \LOCK_EX);
$this->lastMessage = sprintf('Secret "%s" encrypted in "%s"; you can commit it.', $name, $this->getPrettyPath(\dirname($this->pathPrefix).\DIRECTORY_SEPARATOR));
}
public function reveal(string $name): ?string
{
$this->lastMessage = null;
$this->validateName($name);
$filename = $this->getFilename($name);
if (!is_file($file = $this->pathPrefix.$filename.'.php')) {
$this->lastMessage = sprintf('Secret "%s" not found in "%s".', $name, $this->getPrettyPath(\dirname($this->pathPrefix).\DIRECTORY_SEPARATOR));
return null;
}
if (!\function_exists('sodium_crypto_box_seal')) {
$this->lastMessage = sprintf('Secret "%s" cannot be revealed as the "sodium" PHP extension missing. Try running "composer require paragonie/sodium_compat" if you cannot enable the extension."', $name);
return null;
}
$this->loadKeys();
if ('' === $this->decryptionKey) {
$this->lastMessage = sprintf('Secret "%s" cannot be revealed as no decryption key was found in "%s".', $name, $this->getPrettyPath(\dirname($this->pathPrefix).\DIRECTORY_SEPARATOR));
return null;
}
if (false === $value = sodium_crypto_box_seal_open(include $file, $this->decryptionKey)) {
$this->lastMessage = sprintf('Secret "%s" cannot be revealed as the wrong decryption key was provided for "%s".', $name, $this->getPrettyPath(\dirname($this->pathPrefix).\DIRECTORY_SEPARATOR));
return null;
}
return $value;
}
public function remove(string $name): bool
{
$this->lastMessage = null;
$this->validateName($name);
$filename = $this->getFilename($name);
if (!is_file($file = $this->pathPrefix.$filename.'.php')) {
$this->lastMessage = sprintf('Secret "%s" not found in "%s".', $name, $this->getPrettyPath(\dirname($this->pathPrefix).\DIRECTORY_SEPARATOR));
return false;
}
$list = $this->list();
unset($list[$name]);
file_put_contents($this->pathPrefix.'list.php', sprintf("<?php\n\nreturn %s;\n", VarExporter::export($list)), \LOCK_EX);
$this->lastMessage = sprintf('Secret "%s" removed from "%s".', $name, $this->getPrettyPath(\dirname($this->pathPrefix).\DIRECTORY_SEPARATOR));
return @unlink($file) || !file_exists($file);
}
public function list(bool $reveal = false): array
{
$this->lastMessage = null;
if (!is_file($file = $this->pathPrefix.'list.php')) {
return [];
}
$secrets = include $file;
if (!$reveal) {
return $secrets;
}
foreach ($secrets as $name => $value) {
$secrets[$name] = $this->reveal($name);
}
return $secrets;
}
public function loadEnvVars(): array
{
return $this->list(true);
}
private function loadKeys(): void
{
if (!\function_exists('sodium_crypto_box_seal')) {
throw new \LogicException('The "sodium" PHP extension is required to deal with secrets. Alternatively, try running "composer require paragonie/sodium_compat" if you cannot enable the extension.".');
}
if (null !== $this->encryptionKey || '' !== $this->decryptionKey = (string) $this->decryptionKey) {
return;
}
if (is_file($this->pathPrefix.'decrypt.private.php')) {
$this->decryptionKey = (string) include $this->pathPrefix.'decrypt.private.php';
}
if (is_file($this->pathPrefix.'encrypt.public.php')) {
$this->encryptionKey = (string) include $this->pathPrefix.'encrypt.public.php';
} elseif ('' !== $this->decryptionKey) {
$this->encryptionKey = sodium_crypto_box_publickey($this->decryptionKey);
} else {
throw new \RuntimeException(sprintf('Encryption key not found in "%s".', \dirname($this->pathPrefix)));
}
}
private function export(string $filename, string $data): void
{
$b64 = 'decrypt.private' === $filename ? '// SYMFONY_DECRYPTION_SECRET='.base64_encode($data)."\n" : '';
$name = basename($this->pathPrefix.$filename);
$data = str_replace('%', '\x', rawurlencode($data));
$data = sprintf("<?php // %s on %s\n\n%sreturn \"%s\";\n", $name, date('r'), $b64, $data);
$this->createSecretsDir();
if (false === file_put_contents($this->pathPrefix.$filename.'.php', $data, \LOCK_EX)) {
$e = error_get_last();
throw new \ErrorException($e['message'] ?? 'Failed to write secrets data.', 0, $e['type'] ?? \E_USER_WARNING);
}
}
private function createSecretsDir(): void
{
if ($this->secretsDir && !is_dir($this->secretsDir) && !@mkdir($this->secretsDir, 0777, true) && !is_dir($this->secretsDir)) {
throw new \RuntimeException(sprintf('Unable to create the secrets directory (%s).', $this->secretsDir));
}
$this->secretsDir = null;
}
private function getFilename(string $name): string
{
// The MD5 hash allows making secrets case-sensitive. The filename is not enough on Windows.
return $name.'.'.substr(md5($name), 0, 6);
}
}