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<?php
/**
* Cryptography key holder.
*
* @author Julián Gutiérrez <juliangut@gmail.com>
* @copyright Copyright (c) Alex Bilbie
* @license http://mit-license.org/
*
* @link https://github.com/thephpleague/oauth2-server
*/
namespace League\OAuth2\Server;
use LogicException;
class CryptKey
{
/** @deprecated left for backward compatibility check */
const RSA_KEY_PATTERN =
'/^(-----BEGIN (RSA )?(PUBLIC|PRIVATE) KEY-----)\R.*(-----END (RSA )?(PUBLIC|PRIVATE) KEY-----)\R?$/s';
private const FILE_PREFIX = 'file://';
/**
* @var string Key contents
*/
protected $keyContents;
/**
* @var string
*/
protected $keyPath;
/**
* @var null|string
*/
protected $passPhrase;
/**
* @param string $keyPath
* @param null|string $passPhrase
* @param bool $keyPermissionsCheck
*/
public function __construct($keyPath, $passPhrase = null, $keyPermissionsCheck = true)
{
$this->passPhrase = $passPhrase;
if (\strpos($keyPath, self::FILE_PREFIX) !== 0 && $this->isValidKey($keyPath, $this->passPhrase ?? '')) {
$this->keyContents = $keyPath;
$this->keyPath = '';
// There's no file, so no need for permission check.
$keyPermissionsCheck = false;
} elseif (\is_file($keyPath)) {
if (\strpos($keyPath, self::FILE_PREFIX) !== 0) {
$keyPath = self::FILE_PREFIX . $keyPath;
}
if (!\is_readable($keyPath)) {
throw new LogicException(\sprintf('Key path "%s" does not exist or is not readable', $keyPath));
}
$this->keyContents = \file_get_contents($keyPath);
$this->keyPath = $keyPath;
if (!$this->isValidKey($this->keyContents, $this->passPhrase ?? '')) {
throw new LogicException('Unable to read key from file ' . $keyPath);
}
} else {
throw new LogicException('Invalid key supplied');
}
if ($keyPermissionsCheck === true) {
// Verify the permissions of the key
$keyPathPerms = \decoct(\fileperms($this->keyPath) & 0777);
if (\in_array($keyPathPerms, ['400', '440', '600', '640', '660'], true) === false) {
\trigger_error(
\sprintf(
'Key file "%s" permissions are not correct, recommend changing to 600 or 660 instead of %s',
$this->keyPath,
$keyPathPerms
),
E_USER_NOTICE
);
}
}
}
/**
* Get key contents
*
* @return string Key contents
*/
public function getKeyContents(): string
{
return $this->keyContents;
}
/**
* Validate key contents.
*
* @param string $contents
* @param string $passPhrase
*
* @return bool
*/
private function isValidKey($contents, $passPhrase)
{
$pkey = \openssl_pkey_get_private($contents, $passPhrase) ?: \openssl_pkey_get_public($contents);
if ($pkey === false) {
return false;
}
$details = \openssl_pkey_get_details($pkey);
return $details !== false && \in_array(
$details['type'] ?? -1,
[OPENSSL_KEYTYPE_RSA, OPENSSL_KEYTYPE_EC],
true
);
}
/**
* Retrieve key path.
*
* @return string
*/
public function getKeyPath()
{
return $this->keyPath;
}
/**
* Retrieve key pass phrase.
*
* @return null|string
*/
public function getPassPhrase()
{
return $this->passPhrase;
}
}