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<?php |
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//namespace Duo; |
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/* |
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* https://duo.com/docs/duoweb |
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*/ |
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class Duo |
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{ |
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const DUO_PREFIX = "TX"; |
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const APP_PREFIX = "APP"; |
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const AUTH_PREFIX = "AUTH"; |
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const DUO_EXPIRE = 300; |
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const APP_EXPIRE = 3600; |
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const IKEY_LEN = 20; |
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const SKEY_LEN = 40; |
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const AKEY_LEN = 40; // if this changes you have to change ERR_AKEY |
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const ERR_USER = 'ERR|The username passed to sign_request() is invalid.'; |
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const ERR_IKEY = 'ERR|The Duo integration key passed to sign_request() is invalid.'; |
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const ERR_SKEY = 'ERR|The Duo secret key passed to sign_request() is invalid.'; |
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const ERR_AKEY = 'ERR|The application secret key passed to sign_request() must be at least 40 characters.'; |
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private static function signVals($key, $vals, $prefix, $expire, $time = null) |
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{ |
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$exp = ($time ? $time : time()) + $expire; |
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$val = $vals . '|' . $exp; |
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$b64 = base64_encode($val); |
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$cookie = $prefix . '|' . $b64; |
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$sig = hash_hmac("sha1", $cookie, $key); |
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return $cookie . '|' . $sig; |
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} |
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private static function parseVals($key, $val, $prefix, $ikey, $time = null) |
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{ |
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$ts = ($time ? $time : time()); |
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$parts = explode('|', $val); |
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if (count($parts) !== 3) { |
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return null; |
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} |
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list($u_prefix, $u_b64, $u_sig) = $parts; |
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$sig = hash_hmac("sha1", $u_prefix . '|' . $u_b64, $key); |
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if (hash_hmac("sha1", $sig, $key) !== hash_hmac("sha1", $u_sig, $key)) { |
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return null; |
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} |
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if ($u_prefix !== $prefix) { |
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return null; |
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} |
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$cookie_parts = explode('|', base64_decode($u_b64)); |
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if (count($cookie_parts) !== 3) { |
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return null; |
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} |
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list($user, $u_ikey, $exp) = $cookie_parts; |
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if ($u_ikey !== $ikey) { |
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return null; |
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} |
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if ($ts >= intval($exp)) { |
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return null; |
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} |
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return $user; |
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} |
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public static function signRequest($ikey, $skey, $akey, $username, $time = null) |
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{ |
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if (!isset($username) || strlen($username) === 0) { |
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return self::ERR_USER; |
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} |
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if (strpos($username, '|') !== false) { |
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return self::ERR_USER; |
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} |
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if (!isset($ikey) || strlen($ikey) !== self::IKEY_LEN) { |
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return self::ERR_IKEY; |
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} |
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if (!isset($skey) || strlen($skey) !== self::SKEY_LEN) { |
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return self::ERR_SKEY; |
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} |
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if (!isset($akey) || strlen($akey) < self::AKEY_LEN) { |
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return self::ERR_AKEY; |
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} |
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$vals = $username . '|' . $ikey; |
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$duo_sig = self::signVals($skey, $vals, self::DUO_PREFIX, self::DUO_EXPIRE, $time); |
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$app_sig = self::signVals($akey, $vals, self::APP_PREFIX, self::APP_EXPIRE, $time); |
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return $duo_sig . ':' . $app_sig; |
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} |
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public static function verifyResponse($ikey, $skey, $akey, $sig_response, $time = null) |
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{ |
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list($auth_sig, $app_sig) = explode(':', $sig_response); |
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$auth_user = self::parseVals($skey, $auth_sig, self::AUTH_PREFIX, $ikey, $time); |
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$app_user = self::parseVals($akey, $app_sig, self::APP_PREFIX, $ikey, $time); |
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if ($auth_user !== $app_user) { |
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return null; |
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} |
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return $auth_user; |
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} |
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} |
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nilsteampassnet /
TeamPass
