From 79aa5beaf44af13a1828bfa5fc824a08c62054dc Mon Sep 17 00:00:00 2001
From: Marien Fressinaud <dev@marienfressinaud.fr>
Date: Mon, 6 Oct 2014 23:29:20 +0200
Subject: Refactor authentication system.

Big work, not finished. A lot of features have been removed.

See https://github.com/marienfressinaud/FreshRSS/issues/655
---
 app/Models/Auth.php | 209 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 209 insertions(+)
 create mode 100644 app/Models/Auth.php

(limited to 'app/Models')

diff --git a/app/Models/Auth.php b/app/Models/Auth.php
new file mode 100644
index 000000000..c4a3abd98
--- /dev/null
+++ b/app/Models/Auth.php
@@ -0,0 +1,209 @@
+<?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);
+		}
+
+		$access_ok = self::accessControl($current_user);
+
+		if ($access_ok) {
+			self::giveAccess();
+		} 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).
+	 *
+	 * @param string $username username of the user to check access.
+	 * @return boolean true if user can be connected, false else.
+	 */
+	public static function accessControl($username) {
+		if (self::$login_ok) {
+			return true;
+		}
+
+		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 '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($current_user, httpAuthUser()) === 0;
+			break;
+		case 'none':
+			self::$login_ok = true;
+			break;
+		default:
+			// TODO: extensions
+			self::$login_ok = false;
+		}
+
+		Minz_Session::_param('loginOk', self::$login_ok);
+	}
+
+	/**
+	 * Returns if current user is connected.
+	 *
+	 * @return boolean true if user is connected, false else.
+	 */
+	public static function hasAccess() {
+		return self::$login_ok;
+	}
+
+	/**
+	 * Removes all accesses for the current user.
+	 */
+	public static function removeAccess() {
+		Minz_Session::_param('loginOk');
+		self::$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 '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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