138 lines
4.8 KiB
PHP
138 lines
4.8 KiB
PHP
<?php
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$configurationFile = '../lucidAuth.config.php';
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if (!file_exists($configurationFile)) {
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throw new Exception(sprintf('Missing config file. Please rename \'%1$s.example\' to \'%1$s\' and edit it to reflect your setup.', explode('../', $configurationFile)[1]));
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}
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$settings = include_once($configurationFile);
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try {
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# switch ($settings->Database['Driver']) {
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# case 'sqlite':
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# $database = new PDO('sqlite:' . $settings->Database['Path']);
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if (is_writable($settings->Sqlite['Path'])) {
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$pdoDB = new PDO('sqlite:' . $settings->Sqlite['Path']);
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} else {
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throw new Exception(sprintf('Database file \'%1$s\' is not writable', $settings->Sqlite['Path']));
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}
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# }
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}
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catch (Exception $e) {
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throw new Exception(sprintf('Unable to connect to database \'%1$s\'', $settings->Sqlite['Path']));
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}
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function authenticateLDAP (string $username, string $password) {
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global $settings;
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if (!empty($username) && !empty($password)) {
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// Handle login requests
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$ds = ldap_connect($settings->LDAP['Server'], $settings->LDAP['Port']);
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// Strict namingconvention: only allow alphabetic characters
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$sanitizedUsername = preg_replace('([^a-zA-Z]*)', '', $_POST['username']);
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$qualifiedUsername = $settings->LDAP['Domain'] . '\\' . $sanitizedUsername;
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if (@ldap_bind($ds, $qualifiedUsername, utf8_encode($_POST['password']))) {
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// Successful authentication; get additional userdetails from authenticationsource
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$ldapSearchResults = ldap_search($ds, $settings->LDAP['BaseDN'], "sAMAccountName=$sanitizedUsername");
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$commonName = ldap_get_entries($ds, $ldapSearchResults)[0]['cn'][0];
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// Create JWT-payload
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$jwtPayload = [
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'iat' => time(), // Issued at: time when the token was generated
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'iss' => $_SERVER['SERVER_NAME'], // Issuer
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'sub' => $qualifiedUsername, // Subject (ie. username)
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'name' => $commonName // Common name (as retrieved from AD)
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];
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$secureToken = JWT::encode($jwtPayload, base64_decode($settings->JWT['PrivateKey_base64']));
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return ['status' => 'Success', 'token' => $secureToken];
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} else {
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// LDAP authentication failed!
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return ['status' => 'Fail', 'reason' => '1'];
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}
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} else {
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// Empty username or passwords not allowed!
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return ['status' => 'Fail', 'reason' => '1'];
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}
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}
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function storeToken (string $secureToken, string $qualifiedUsername, string $httpHost) {
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global $settings, $pdoDB;
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// Save authentication token in database serverside
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try {
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$pdoQuery = $pdoDB->prepare('
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INSERT INTO SecureToken (UserId, Value)
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SELECT User.Id, :securetoken
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FROM User
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WHERE User.Username = :qualifiedusername
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');
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$pdoQuery->execute([
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':securetoken' => $secureToken,
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':qualifiedusername' => $qualifiedUsername
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]);
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}
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catch (Exception $e) {
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return ['status' => 'Fail', 'reason' => $e];
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}
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// Save authentication token in cookie clientside
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$cookieDomain = array_values(array_filter($settings->Session['CookieDomains'], function ($value) use ($httpHost) {
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// Check if $_SERVER['HTTP_HOST'] matches any of the configured domains (either explicitly or as a subdomain)
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// This might seem backwards, but relying on $_SERVER directly allows spoofed values with potential security risks
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return (strlen($value) > strlen($httpHost)) ? false : (0 === substr_compare($httpHost, $value, -strlen($value)));
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}))[0];
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if ($cookieDomain && setcookie('JWT', $secureToken, (time() + $settings->Session['Duration']), '/', '.' . $cookieDomain)) {
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return ['status' => 'Success'];
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} else {
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return ['status' => 'Fail', 'reason' => 'Unable to store cookie(s)'];
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}
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}
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function validateToken (string $secureToken) {
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global $settings, $pdoDB;
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// Decode provided authentication token
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try {
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$jwtPayload = JWT::decode($secureToken, base64_decode($settings->JWT['PrivateKey_base64']), $settings->JWT['Algorithm']);
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} catch (Exception $e) {
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// Invalid token
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return ['status' => 'Fail', 'reason' => '1'];
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}
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if ((int)$jwtPayload->iat < (time() - (int)$settings->Session['Duration'])) {
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// Expired token
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return ['status' => 'Fail', 'reason' => '3'];
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}
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// Retrieve all authentication tokens from database matching username
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$pdoQuery = $pdoDB->prepare('
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SELECT SecureToken.Value
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FROM SecureToken
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LEFT JOIN User
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ON (User.Id=SecureToken.UserId)
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WHERE User.Username = :username
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');
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$pdoQuery->execute([
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':username' => (string)$jwtPayload->sub
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]);
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foreach($pdoQuery->fetchAll(PDO::FETCH_ASSOC) as $row) {
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try {
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$storedTokens[] = JWT::decode($row['Value'], base64_decode($settings->JWT['PrivateKey_base64']), $settings->JWT['Algorithm']);
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} catch (Exception $e) {
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continue;
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}
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}
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// Compare provided authentication token to all stored tokens in database
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if (!empty($storedTokens) && sizeof(array_filter($storedTokens, function ($value) use ($jwtPayload) {
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return $value->iat === $jwtPayload->iat;
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})) === 1) {
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return ['status' => 'Success'];
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} else {
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return ['status' => 'Fail', 'reason' => '2'];
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}
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}
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?>
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