Add: GoogleAuthenticator.php google authenticator二次认证

src/Library/GoogleAuthenticator.php

@@ -0,0 +1,252 @@
+<?php
+namespace Qii\Library;
+/**
+ * PHP Class for handling Google Authenticator 2-factor authentication.
+ *
+ * @author Michael Kliewe
+ * @copyright 2012 Michael Kliewe
+ * @license http://www.opensource.org/licenses/bsd-license.php BSD License
+ *
+ * @link http://www.phpgangsta.de/
+ */
+class GoogleAuthenticator
+{
+    protected $_codeLength = 6;
+
+    /**
+     * Create new secret.
+     * 16 characters, randomly chosen from the allowed base32 characters.
+     *
+     * @param int $secretLength
+     *
+     * @return string
+     */
+    public function createSecret($secretLength = 16)
+    {
+        $validChars = $this->_getBase32LookupTable();
+
+        // Valid secret lengths are 80 to 640 bits
+        if ($secretLength < 16 || $secretLength > 128) {
+            throw new Exception('Bad secret length');
+        }
+        $secret = '';
+        $rnd = false;
+        if (function_exists('random_bytes')) {
+            $rnd = random_bytes($secretLength);
+        } elseif (function_exists('mcrypt_create_iv')) {
+            $rnd = mcrypt_create_iv($secretLength, MCRYPT_DEV_URANDOM);
+        } elseif (function_exists('openssl_random_pseudo_bytes')) {
+            $rnd = openssl_random_pseudo_bytes($secretLength, $cryptoStrong);
+            if (!$cryptoStrong) {
+                $rnd = false;
+            }
+        }
+        if ($rnd !== false) {
+            for ($i = 0; $i < $secretLength; ++$i) {
+                $secret .= $validChars[ord($rnd[$i]) & 31];
+            }
+        } else {
+            throw new Exception('No source of secure random');
+        }
+
+        return $secret;
+    }
+
+    /**
+     * Calculate the code, with given secret and point in time.
+     *
+     * @param string   $secret
+     * @param int|null $timeSlice
+     *
+     * @return string
+     */
+    public function getCode($secret, $timeSlice = null)
+    {
+        if ($timeSlice === null) {
+            $timeSlice = floor(time() / 30);
+        }
+
+        $secretkey = $this->_base32Decode($secret);
+
+        // Pack time into binary string
+        $time = chr(0).chr(0).chr(0).chr(0).pack('N*', $timeSlice);
+        // Hash it with users secret key
+        $hm = hash_hmac('SHA1', $time, $secretkey, true);
+        // Use last nipple of result as index/offset
+        $offset = ord(substr($hm, -1)) & 0x0F;
+        // grab 4 bytes of the result
+        $hashpart = substr($hm, $offset, 4);
+
+        // Unpak binary value
+        $value = unpack('N', $hashpart);
+        $value = $value[1];
+        // Only 32 bits
+        $value = $value & 0x7FFFFFFF;
+
+        $modulo = pow(10, $this->_codeLength);
+
+        return str_pad($value % $modulo, $this->_codeLength, '0', STR_PAD_LEFT);
+    }
+
+    /**
+     * Get QR-Code URL for image, from google charts.
+     *
+     * @param string $name
+     * @param string $secret
+     * @param string $title
+     * @param array  $params
+     *
+     * @return string
+     */
+    public function getQRCodeGoogleUrl($name, $secret, $title = null, $params = array())
+    {
+        $width = !empty($params['width']) && (int) $params['width'] > 0 ? (int) $params['width'] : 200;
+        $height = !empty($params['height']) && (int) $params['height'] > 0 ? (int) $params['height'] : 200;
+        $level = !empty($params['level']) && array_search($params['level'], array('L', 'M', 'Q', 'H')) !== false ? $params['level'] : 'M';
+
+        $urlencoded = urlencode('otpauth://totp/'.$name.'?secret='.$secret.'');
+        if (isset($title)) {
+            $urlencoded .= urlencode('&issuer='.urlencode($title));
+        }
+
+        return "https://api.qrserver.com/v1/create-qr-code/?data=$urlencoded&size=${width}x${height}&ecc=$level";
+    }
+
+    /**
+     * Check if the code is correct. This will accept codes starting from $discrepancy*30sec ago to $discrepancy*30sec from now.
+     *
+     * @param string   $secret
+     * @param string   $code
+     * @param int      $discrepancy      This is the allowed time drift in 30 second units (8 means 4 minutes before or after)
+     * @param int|null $currentTimeSlice time slice if we want use other that time()
+     *
+     * @return bool
+     */
+    public function verifyCode($secret, $code, $discrepancy = 1, $currentTimeSlice = null)
+    {
+        if ($currentTimeSlice === null) {
+            $currentTimeSlice = floor(time() / 30);
+        }
+
+        if (strlen($code) != 6) {
+            return false;
+        }
+
+        for ($i = -$discrepancy; $i <= $discrepancy; ++$i) {
+            $calculatedCode = $this->getCode($secret, $currentTimeSlice + $i);
+            if ($this->timingSafeEquals($calculatedCode, $code)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Set the code length, should be >=6.
+     *
+     * @param int $length
+     *
+     * @return PHPGangsta_GoogleAuthenticator
+     */
+    public function setCodeLength($length)
+    {
+        $this->_codeLength = $length;
+
+        return $this;
+    }
+
+    /**
+     * Helper class to decode base32.
+     *
+     * @param $secret
+     *
+     * @return bool|string
+     */
+    protected function _base32Decode($secret)
+    {
+        if (empty($secret)) {
+            return '';
+        }
+
+        $base32chars = $this->_getBase32LookupTable();
+        $base32charsFlipped = array_flip($base32chars);
+
+        $paddingCharCount = substr_count($secret, $base32chars[32]);
+        $allowedValues = array(6, 4, 3, 1, 0);
+        if (!in_array($paddingCharCount, $allowedValues)) {
+            return false;
+        }
+        for ($i = 0; $i < 4; ++$i) {
+            if ($paddingCharCount == $allowedValues[$i] &&
+                substr($secret, -($allowedValues[$i])) != str_repeat($base32chars[32], $allowedValues[$i])) {
+                return false;
+            }
+        }
+        $secret = str_replace('=', '', $secret);
+        $secret = str_split($secret);
+        $binaryString = '';
+        for ($i = 0; $i < count($secret); $i = $i + 8) {
+            $x = '';
+            if (!in_array($secret[$i], $base32chars)) {
+                return false;
+            }
+            for ($j = 0; $j < 8; ++$j) {
+                $x .= str_pad(base_convert(@$base32charsFlipped[@$secret[$i + $j]], 10, 2), 5, '0', STR_PAD_LEFT);
+            }
+            $eightBits = str_split($x, 8);
+            for ($z = 0; $z < count($eightBits); ++$z) {
+                $binaryString .= (($y = chr(base_convert($eightBits[$z], 2, 10))) || ord($y) == 48) ? $y : '';
+            }
+        }
+
+        return $binaryString;
+    }
+
+    /**
+     * Get array with all 32 characters for decoding from/encoding to base32.
+     *
+     * @return array
+     */
+    protected function _getBase32LookupTable()
+    {
+        return array(
+            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', //  7
+            'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', // 15
+            'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', // 23
+            'Y', 'Z', '2', '3', '4', '5', '6', '7', // 31
+            '=',  // padding char
+        );
+    }
+
+    /**
+     * A timing safe equals comparison
+     * more info here: http://blog.ircmaxell.com/2014/11/its-all-about-time.html.
+     *
+     * @param string $safeString The internal (safe) value to be checked
+     * @param string $userString The user submitted (unsafe) value
+     *
+     * @return bool True if the two strings are identical
+     */
+    private function timingSafeEquals($safeString, $userString)
+    {
+        if (function_exists('hash_equals')) {
+            return hash_equals($safeString, $userString);
+        }
+        $safeLen = strlen($safeString);
+        $userLen = strlen($userString);
+
+        if ($userLen != $safeLen) {
+            return false;
+        }
+
+        $result = 0;
+
+        for ($i = 0; $i < $userLen; ++$i) {
+            $result |= (ord($safeString[$i]) ^ ord($userString[$i]));
+        }
+
+        // They are only identical strings if $result is exactly 0...
+        return $result === 0;
+    }
+}