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<?php |
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namespace kalanis\kw_auth\Methods; |
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use ArrayAccess; |
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use kalanis\kw_accounts\Interfaces\IAuthCert; |
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/** |
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* Class HttpDigest |
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* @package kalanis\kw_auth\AuthMethods |
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* Authenticate via digest http method |
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* @link https://serverpilot.io/docs/how-to-perform-http-digest-authentication-with-php/ |
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* @link https://www.php.net/manual/en/features.http-auth.php |
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*/ |
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class HttpDigest extends AMethods |
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{ |
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public const INPUT_METHOD = 'REQUEST_METHOD'; |
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public const INPUT_DIGEST = 'PHP_AUTH_DIGEST'; |
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protected string $realm = 'KWCMS_Http_Digest'; |
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protected IAuthCert $certAuthenticator; |
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/** @var ArrayAccess<string, string|int> */ |
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protected ArrayAccess $server; |
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/** |
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* @param IAuthCert $authenticator |
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* @param AMethods|null $nextOne |
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* @param ArrayAccess<string, string|int> $server |
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*/ |
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public function __construct(IAuthCert $authenticator, ?AMethods $nextOne, ArrayAccess $server) |
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{ |
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parent::__construct($authenticator, $nextOne); |
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$this->certAuthenticator = $authenticator; |
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$this->server = $server; |
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} |
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public function process(ArrayAccess $credentials): void |
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{ |
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if (!$this->server->offsetExists(static::INPUT_DIGEST) || empty($this->server->offsetGet(static::INPUT_DIGEST))) { |
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return; |
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} |
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$data = $this->httpDigestParse(strval($this->server->offsetGet(static::INPUT_DIGEST))); |
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if (!empty($data)) { |
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$wantedUser = $this->certAuthenticator->getDataOnly(strval($data['username'])); |
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$wantedCert = $this->certAuthenticator->getCertData(strval($data['username'])); |
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if (!$wantedCert || !$wantedUser) { |
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return; |
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} |
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// verify |
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$A1 = md5($data['username'] . ':' . $this->realm . ':' . $wantedCert->getPubKey()); // @todo: srsly, pubkey?! have nothing better? |
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$A2 = md5($this->server->offsetGet(static::INPUT_METHOD) . ':' . $data['uri']); |
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$valid_response = md5($A1 . ':' . $data['nonce'] . ':' . $data['nc'] . ':' . $data['cnonce'] . ':' . $data['qop'] . ':' . $A2); |
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if ($data['response'] == $valid_response) { |
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// OK |
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$this->loggedUser = $wantedUser; |
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} |
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} |
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} |
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/** |
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* @codeCoverageIgnore headers |
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*/ |
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public function remove(): void |
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{ |
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$this->authNotExists(); |
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} |
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/** |
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* @codeCoverageIgnore headers |
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*/ |
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public function authNotExists(): void |
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{ |
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header('HTTP/1.1 401 Unauthorized'); |
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header('WWW-Authenticate: Digest realm="' . $this->realm . '",qop="auth",nonce="' . uniqid() . '",opaque="' . md5($this->realm) . '"'); |
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} |
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/** |
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* Parse the http auth header |
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* @param string $txt |
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* @return array<string, string> |
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*/ |
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protected function httpDigestParse(string $txt): array |
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{ |
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// protect against missing data |
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$needed_parts = ['nonce' => 1, 'nc' => 1, 'cnonce' => 1, 'qop' => 1, 'username' => 1, 'uri' => 1, 'response' => 1]; |
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$data = []; |
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$keys = implode('|', array_keys($needed_parts)); |
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preg_match_all('@(' . $keys . ')=(?:([\'"])([^\2]*?)\2|([^\s,]+))@', $txt, $matches, PREG_SET_ORDER); |
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foreach ($matches as $m) { |
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$data[strval($m[1])] = strval($m[3] ?: ( $m[4] ?? '' )); |
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unset($needed_parts[$m[1]]); |
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} |
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// can be and shall be due that unset a few lines above |
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return empty($needed_parts) ? $data : []; |
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} |
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} |
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alex-kalanis /
kw_auth
