55 lines
1.5 KiB
PHP
55 lines
1.5 KiB
PHP
<?php
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/** Require One-Time Password at login
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* @link https://www.adminer.org/plugins/otp/
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* @author Jakub Vrana, https://www.vrana.cz/
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* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
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* @license https://www.gnu.org/licenses/gpl-2.0.html GNU General Public License, version 2 (one or other)
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*/
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class AdminerLoginOtp {
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/** @access protected */
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var $secret;
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/**
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* @param string decoded secret, e.g. base32_decode("SECRET")
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*/
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function __construct($secret) {
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$this->secret = $secret;
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if ($_POST["auth"]) {
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$_SESSION["otp"] = (string) $_POST["auth"]["otp"];
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}
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}
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function loginFormField($name, $heading, $value) {
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if ($name == 'password') {
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return $heading . $value
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. "<tr><th><acronym title='One Time Password' lang='en'>OTP</acronym>"
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. "<td><input type='number' name='auth[otp]' value='" . h($_SESSION["otp"]) . "' size='6' autocomplete='off'>\n"
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;
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}
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}
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function login($login, $password) {
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if (isset($_SESSION["otp"])) {
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$timeSlot = floor(time() / 30);
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foreach (array(0, -1, 1) as $skew) {
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if ($_SESSION["otp"] == $this->getOtp($timeSlot + $skew)) {
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restart_session();
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unset($_SESSION["otp"]);
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stop_session();
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return;
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}
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}
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return 'Invalid OTP.';
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}
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}
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function getOtp($timeSlot) {
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$data = str_pad(pack('N', $timeSlot), 8, "\0", STR_PAD_LEFT);
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$hash = hash_hmac('sha1', $data, $this->secret, true);
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$offset = ord(substr($hash, -1)) & 0xF;
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$unpacked = unpack('N', substr($hash, $offset, 4));
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return ($unpacked[1] & 0x7FFFFFFF) % 1e6;
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}
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}
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