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<?php
namespace Intervention\Httpauth;
class DigestUser implements UserInterface
{
/**
* Nonce to discourage cryptanalysis
*
* @var string
*/
private $nonce;
/**
* nc
* @var string
*/
private $nc;
/**
* cnonce
* @var string
*/
private $cnonce;
/**
* quality of protection
*
* @var string
*/
private $qop;
/**
* Name of user
*
* @var string
*/
private $username;
/**
* Requested uri
*
* @var string
*/
private $uri;
/**
* Response
*
* @var string
*/
private $response;
/**
* Creates a new instance
*/
public function __construct()
{
$this->parse();
}
/**
* Checks for valid username & password
*
* @param string $name
* @param string $password
* @return boolean
*/
public function isValid($name, $password, $realm)
{
$request_method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';
$u1 = md5(sprintf('%s:%s:%s', $this->username, $realm, $password));
$u2 = md5(sprintf('%s:%s', $request_method, $this->uri));
$response = md5(sprintf('%s:%s:%s:%s:%s:%s', $u1, $this->nonce, $this->nc, $this->cnonce, $this->qop, $u2));
return ($response == $this->response) && ($name == $this->username);
}
/**
* Parses the User Information from server variables
* @return void
*/
public function parse()
{
$digest = $this->getDigest();
$user = array();
$required = array('nonce' => 1, 'nc' => 1, 'cnonce' => 1, 'qop' => 1, 'username' => 1, 'uri' => 1, 'response' => 1);
preg_match_all('@(\w+)=(?:(?:")([^"]+)"|([^\s,$]+))@', $digest, $matches, PREG_SET_ORDER);
if (is_array($matches)) {
foreach ($matches as $m) {
$key = $m[1];
$user[$key] = $m[2] ? $m[2] : $m[3];
unset($required[$key]);
}
if (count($required) == 0) {
$this->nonce = $user['nonce'];
$this->nc = $user['nc'];
$this->cnonce = $user['cnonce'];
$this->qop = $user['qop'];
$this->username = $user['username'];
$this->uri = $user['uri'];
$this->response = $user['response'];
}
}
}
/**
* Fetch digest data from environment information
*
* @return string
*/
public function getDigest()
{
$digest = null;
if (isset($_SERVER['PHP_AUTH_DIGEST'])) {
$digest = $_SERVER['PHP_AUTH_DIGEST'];
} elseif (isset($_SERVER['HTTP_AUTHORIZATION'])) {
if (strpos(strtolower($_SERVER['HTTP_AUTHORIZATION']), 'digest') === 0) {
$digest = substr($_SERVER['HTTP_AUTHORIZATION'], 7);
}
}
return $digest;
}
}
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