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<? | ||
/** | ||
* This program is free software: you can redistribute it and/or modify | ||
* it under the terms of the GNU General Public License as published by | ||
* the Free Software Foundation, either version 3 of the License, or | ||
* (at your option) any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
* | ||
* PHP Google two-factor authentication module. | ||
* | ||
* See http://www.idontplaydarts.com/2011/07/google-totp-two-factor-authentication-for-php/ | ||
* for more details | ||
* | ||
* @author Phil | ||
**/ | ||
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class Google2FA { | ||
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const keyRegeneration = 30; // Interval between key regeneration | ||
const otpLength = 6; // Length of the Token generated | ||
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private static $lut = array( // Lookup needed for Base32 encoding | ||
"A" => 0, "B" => 1, | ||
"C" => 2, "D" => 3, | ||
"E" => 4, "F" => 5, | ||
"G" => 6, "H" => 7, | ||
"I" => 8, "J" => 9, | ||
"K" => 10, "L" => 11, | ||
"M" => 12, "N" => 13, | ||
"O" => 14, "P" => 15, | ||
"Q" => 16, "R" => 17, | ||
"S" => 18, "T" => 19, | ||
"U" => 20, "V" => 21, | ||
"W" => 22, "X" => 23, | ||
"Y" => 24, "Z" => 25, | ||
"2" => 26, "3" => 27, | ||
"4" => 28, "5" => 29, | ||
"6" => 30, "7" => 31 | ||
); | ||
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/** | ||
* Generates a 16 digit secret key in base32 format | ||
* @return string | ||
**/ | ||
public static function generate_secret_key($length = 16) { | ||
$b32 = "234567QWERTYUIOPASDFGHJKLZXCVBNM"; | ||
$s = ""; | ||
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for ($i = 0; $i < $length; $i++) | ||
$s .= $b32[rand(0,31)]; | ||
return $s; | ||
} | ||
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/** | ||
* Returns the current Unix Timestamp devided by the keyRegeneration | ||
* period. | ||
* @return integer | ||
**/ | ||
public static function get_timestamp() { | ||
return floor(microtime(true)/self::keyRegeneration); | ||
} | ||
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/** | ||
* Decodes a base32 string into a binary string. | ||
**/ | ||
public static function base32_decode($b32) { | ||
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$b32 = strtoupper($b32); | ||
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if (!preg_match('/^[ABCDEFGHIJKLMNOPQRSTUVWXYZ234567]+$/', $b32, $match)) | ||
throw new Exception('Invalid characters in the base32 string.'); | ||
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$l = strlen($b32); | ||
$n = 0; | ||
$j = 0; | ||
$binary = ""; | ||
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for ($i = 0; $i < $l; $i++) { | ||
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$n = $n << 5; // Move buffer left by 5 to make room | ||
$n = $n + self::$lut[$b32[$i]]; // Add value into buffer | ||
$j = $j + 5; // Keep track of number of bits in buffer | ||
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if ($j >= 8) { | ||
$j = $j - 8; | ||
$binary .= chr(($n & (0xFF << $j)) >> $j); | ||
} | ||
} | ||
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return $binary; | ||
} | ||
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/** | ||
* Takes the secret key and the timestamp and returns the one time | ||
* password. | ||
* | ||
* @param binary $key - Secret key in binary form. | ||
* @param integer $counter - Timestamp as returned by get_timestamp. | ||
* @return string | ||
**/ | ||
public static function oath_hotp($key, $counter) | ||
{ | ||
if (strlen($key) < 8) | ||
throw new Exception('Secret key is too short. Must be at least 16 base 32 characters'); | ||
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$bin_counter = pack('N*', 0) . pack('N*', $counter); // Counter must be 64-bit int | ||
$hash = hash_hmac ('sha1', $bin_counter, $key, true); | ||
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return str_pad(self::oath_truncate($hash), self::otpLength, '0', STR_PAD_LEFT); | ||
} | ||
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/** | ||
* Verifys a user inputted key against the current timestamp. Checks $window | ||
* keys either side of the timestamp. | ||
* | ||
* @param string $b32seed | ||
* @param string $key - User specified key | ||
* @param integer $window | ||
* @param boolean $useTimeStamp | ||
* @return boolean | ||
**/ | ||
public static function verify_key($b32seed, $key, $window = 4, $useTimeStamp = true) { | ||
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$timeStamp = self::get_timestamp(); | ||
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if ($useTimeStamp !== true) $timeStamp = (int)$useTimeStamp; | ||
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$binarySeed = self::base32_decode($b32seed); | ||
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for ($ts = $timeStamp - $window; $ts <= $timeStamp + $window; $ts++) | ||
if (self::oath_hotp($binarySeed, $ts) == $key) | ||
return true; | ||
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return false; | ||
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} | ||
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/** | ||
* Extracts the OTP from the SHA1 hash. | ||
* @param binary $hash | ||
* @return integer | ||
**/ | ||
public static function oath_truncate($hash) | ||
{ | ||
$offset = ord($hash[19]) & 0xf; | ||
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return ( | ||
((ord($hash[$offset+0]) & 0x7f) << 24 ) | | ||
((ord($hash[$offset+1]) & 0xff) << 16 ) | | ||
((ord($hash[$offset+2]) & 0xff) << 8 ) | | ||
(ord($hash[$offset+3]) & 0xff) | ||
) % pow(10, self::otpLength); | ||
} | ||
} |
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/* | ||
* Copyright 2007-2013 Charles du Jeu - Abstrium SAS <team (at) pyd.io> | ||
* This file is part of Pydio. | ||
* | ||
* Pydio is free software: you can redistribute it and/or modify | ||
* it under the terms of the GNU Affero General Public License as published by | ||
* the Free Software Foundation, either version 3 of the License, or | ||
* (at your option) any later version. | ||
* | ||
* Pydio is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU Affero General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU Affero General Public License | ||
* along with Pydio. If not, see <http://www.gnu.org/licenses/>. | ||
* | ||
* The latest code can be found at <http://pyd.io/>. | ||
* | ||
*/ | ||
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