mirror of
https://github.com/YunoHost-Apps/kanboard_ynh.git
synced 2024-09-03 19:36:17 +02:00
100 lines
2.5 KiB
PHP
100 lines
2.5 KiB
PHP
<?php
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session_start(); // using it as storage temporary
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require_once __DIR__ . '/../vendor/autoload.php';
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use Otp\Otp;
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use Otp\GoogleAuthenticator;
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use Base32\Base32;
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// Getting a secret, either by generating or from storage
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// DON'T use sessions as storage for this in production!!!
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$secret = 0;
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if (isset($_SESSION['otpsecret'])) {
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$secret = $_SESSION['otpsecret'];
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}
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if (strlen($secret) != 16) {
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$secret = GoogleAuthenticator::generateRandom();
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$_SESSION['otpsecret'] = $secret;
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}
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// The secret is now an easy stored Base32 string.
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// To use it in totp though we need to decode it into the original
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$otp = new Otp();
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$currentTotp = $otp->totp(Base32::decode($secret));
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$qrCode = GoogleAuthenticator::getQrCodeUrl('totp', 'otpsample@cr', $secret);
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$keyUri = GoogleAuthenticator::getKeyUri('totp', 'otpsample@cr', $secret);
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?><html>
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<head>
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<title>One Time Passwords Example</title>
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</head>
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<body>
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<h1>One Time Passwords Example</h1>
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Secret is <?php echo $secret; ?>. This is saved with the users credentials.
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<br />
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<br />
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<hr />
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QR Code for totp:<br />
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<img src="<?php echo $qrCode; ?>" />
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<br />
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This QR Code contains the Key URI: <?php echo $keyUri; ?>
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<br />
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<hr />
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Current totp would be <?php echo $currentTotp; ?><br />
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<br />
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<hr />
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Because of timedrift, you could technically enter a code before or after it
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would actually be used. This form uses the checkTotp function. To test this,
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open this page, wait until the key changes once or twice (not more) on your
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Google Authenticator, then hit submit. Even though the key is "wrong" because of
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small time differences, you can still use it.
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<form action="" method="post">
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<input type="text" name="otpkey" value="<?php echo $currentTotp; ?>" /><br />
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<input type="submit">
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</form>
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<br />
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Output:<br />
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<br />
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<?php
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if (isset($_POST['otpkey'])) {
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// Sanatizing, this should take care of it
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$key = preg_replace('/[^0-9]/', '', $_POST['otpkey']);
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// Standard is 6 for keys, but can be changed with setDigits on $otp
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if (strlen($key) == 6) {
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// Remember that the secret is a base32 string that needs decoding
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// to use it here!
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if ($otp->checkTotp(Base32::decode($secret), $key)) {
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echo 'Key correct!';
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// Add here something that makes note of this key and will not allow
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// the use of it, for this user for the next 2 minutes. This way you
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// prevent a replay attack. Otherwise your OTP is missing one of the
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// key features it can bring in security to your application!
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} else {
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echo 'Wrong key!';
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}
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} else {
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echo 'Key not the correct size';
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}
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}
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?>
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</body>
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</html>
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