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<?php
/**
* This class handles all authentication process.
*/
class FreshRSS_Auth {
/**
* Determines if user is connected.
*/
private static $login_ok = false;
/**
* This method initializes authentication system.
*/
public static function init() {
self::$login_ok = Minz_Session::param('loginOk', false);
$current_user = Minz_Session::param('currentUser', '');
if ($current_user === '') {
$current_user = Minz_Configuration::defaultUser();
Minz_Session::_param('currentUser', $current_user);
}
if (self::$login_ok) {
self::giveAccess();
} elseif (self::accessControl()) {
self::giveAccess();
FreshRSS_UserDAO::touch($current_user);
} else {
// Be sure all accesses are removed!
self::removeAccess();
}
}
/**
* This method checks if user is allowed to connect.
*
* Required session parameters are also set in this method (such as
* currentUser).
*
* @return boolean true if user can be connected, false else.
*/
private static function accessControl() {
switch (Minz_Configuration::authType()) {
case 'form':
$credentials = FreshRSS_FormAuth::getCredentialsFromCookie();
$current_user = '';
if (isset($credentials[1])) {
$current_user = trim($credentials[0]);
Minz_Session::_param('currentUser', $current_user);
Minz_Session::_param('passwordHash', trim($credentials[1]));
}
return $current_user != '';
case 'http_auth':
$current_user = httpAuthUser();
$login_ok = $current_user != '';
if ($login_ok) {
Minz_Session::_param('currentUser', $current_user);
}
return $login_ok;
case 'persona':
$email = filter_var(Minz_Session::param('mail'), FILTER_VALIDATE_EMAIL);
$persona_file = DATA_PATH . '/persona/' . $email . '.txt';
if (($current_user = @file_get_contents($persona_file)) !== false) {
$current_user = trim($current_user);
Minz_Session::_param('currentUser', $current_user);
Minz_Session::_param('mail', $email);
return true;
}
return false;
case 'none':
return true;
default:
// TODO load extension
return false;
}
}
/**
* Gives access to the current user.
*/
public static function giveAccess() {
$current_user = Minz_Session::param('currentUser');
try {
$conf = new FreshRSS_Configuration($current_user);
} catch(Minz_Exception $e) {
die($e->getMessage());
}
switch (Minz_Configuration::authType()) {
case 'form':
self::$login_ok = Minz_Session::param('passwordHash') === $conf->passwordHash;
break;
case 'http_auth':
self::$login_ok = strcasecmp($current_user, httpAuthUser()) === 0;
break;
case 'persona':
self::$login_ok = strcasecmp(Minz_Session::param('mail'), $conf->mail_login) === 0;
break;
case 'none':
self::$login_ok = true;
break;
default:
// TODO: extensions
self::$login_ok = false;
}
Minz_Session::_param('loginOk', self::$login_ok);
}
/**
* Returns if current user has access to the given scope.
*
* @param string $scope general (default) or admin
* @return boolean true if user has corresponding access, false else.
*/
public static function hasAccess($scope = 'general') {
$ok = self::$login_ok;
switch ($scope) {
case 'general':
break;
case 'admin':
$ok &= Minz_Session::param('currentUser') === Minz_Configuration::defaultUser();
break;
default:
$ok = false;
}
return $ok;
}
/**
* Removes all accesses for the current user.
*/
public static function removeAccess() {
Minz_Session::_param('loginOk');
self::$login_ok = false;
Minz_Session::_param('currentUser', Minz_Configuration::defaultUser());
switch (Minz_Configuration::authType()) {
case 'form':
Minz_Session::_param('passwordHash');
FreshRSS_FormAuth::deleteCookie();
break;
case 'persona':
Minz_Session::_param('mail');
break;
case 'http_auth':
case 'none':
// Nothing to do...
break;
default:
// TODO: extensions
}
}
}
class FreshRSS_FormAuth {
public static function checkCredentials($username, $hash, $nonce, $challenge) {
if (!ctype_alnum($username) ||
!ctype_graph($challenge) ||
!ctype_alnum($nonce)) {
Minz_Log::debug('Invalid credential parameters:' .
' user=' . $username .
' challenge=' . $challenge .
' nonce=' . $nonce);
return false;
}
if (!function_exists('password_verify')) {
include_once(LIB_PATH . '/password_compat.php');
}
return password_verify($nonce . $hash, $challenge);
}
public static function getCredentialsFromCookie() {
$token = Minz_Session::getLongTermCookie('FreshRSS_login');
if (!ctype_alnum($token)) {
return array();
}
$token_file = DATA_PATH . '/tokens/' . $token . '.txt';
$mtime = @filemtime($token_file);
if ($mtime + 2629744 < time()) {
// Token has expired (> 1 month) or does not exist.
// TODO: 1 month -> use a configuration instead
@unlink($token_file);
return array();
}
$credentials = @file_get_contents($token_file);
return $credentials === false ? array() : explode("\t", $credentials, 2);
}
public static function makeCookie($username, $password_hash) {
do {
$token = sha1(Minz_Configuration::salt() . $username . uniqid(mt_rand(), true));
$token_file = DATA_PATH . '/tokens/' . $token . '.txt';
} while (file_exists($token_file));
if (@file_put_contents($token_file, $username . "\t" . $password_hash) === false) {
return false;
}
$expire = time() + 2629744; //1 month //TODO: Use a configuration instead
Minz_Session::setLongTermCookie('FreshRSS_login', $token, $expire);
return $token;
}
public static function deleteCookie() {
$token = Minz_Session::getLongTermCookie('FreshRSS_login');
Minz_Session::deleteLongTermCookie('FreshRSS_login');
if (ctype_alnum($token)) {
@unlink(DATA_PATH . '/tokens/' . $token . '.txt');
}
if (rand(0, 10) === 1) {
self::purgeTokens();
}
}
public static function purgeTokens() {
$oldest = time() - 2629744; // 1 month // TODO: Use a configuration instead
foreach (new DirectoryIterator(DATA_PATH . '/tokens/') as $file_info) {
// $extension = $file_info->getExtension(); doesn't work in PHP < 5.3.7
$extension = pathinfo($file_info->getFilename(), PATHINFO_EXTENSION);
if ($extension === 'txt' && $file_info->getMTime() < $oldest) {
@unlink($file_info->getPathname());
}
}
}
}
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