X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FBaseModule.php;h=85a506beaadb79353ee64a91b9f1f61ada2db285;hb=14622c4bfd380dd46473665dc0fbf53f85d145f0;hp=aad4e6fb01dd8df56c91fdf068415937f8f23984;hpb=c845415a99ebc348103815a7b2c55b15c75cdd24;p=friendica.git

diff --git a/src/BaseModule.php b/src/BaseModule.php
index aad4e6fb01..85a506beaa 100644
--- a/src/BaseModule.php
+++ b/src/BaseModule.php
@@ -2,11 +2,18 @@
 
 namespace Friendica;
 
+use Friendica\Core\L10n;
+use Friendica\Core\Logger;
+use Friendica\Core\System;
+
 /**
  * All modules in Friendica should extend BaseModule, although not all modules
  * need to extend all the methods described here
  *
- * @author Hypolite Petovan mrpetovan@gmail.com
+ * The filename of the module in src/Module needs to match the class name
+ * exactly to make the module available.
+ *
+ * @author Hypolite Petovan <hypolite@mrpetovan.com>
  */
 abstract class BaseModule extends BaseObject
 {
@@ -18,7 +25,16 @@ abstract class BaseModule extends BaseObject
 	 */
 	public static function init()
 	{
+	}
 
+	/**
+	 * @brief Module GET method to display raw content from technical endpoints
+	 *
+	 * Extend this method if the module is supposed to return communication data,
+	 * e.g. from protocol implementations.
+	 */
+	public static function rawContent()
+	{
 	}
 
 	/**
@@ -45,7 +61,8 @@ abstract class BaseModule extends BaseObject
 	 */
 	public static function post()
 	{
-		// goaway('module');
+		// $a = self::getApp();
+		// $a->internalRedirect('module');
 	}
 
 	/**
@@ -57,4 +74,84 @@ abstract class BaseModule extends BaseObject
 	{
 
 	}
+
+	/*
+	 * Functions used to protect against Cross-Site Request Forgery
+	 * The security token has to base on at least one value that an attacker can't know - here it's the session ID and the private key.
+	 * In this implementation, a security token is reusable (if the user submits a form, goes back and resubmits the form, maybe with small changes;
+	 * or if the security token is used for ajax-calls that happen several times), but only valid for a certain amout of time (3hours).
+	 * The "typename" seperates the security tokens of different types of forms. This could be relevant in the following case:
+	 *    A security token is used to protekt a link from CSRF (e.g. the "delete this profile"-link).
+	 *    If the new page contains by any chance external elements, then the used security token is exposed by the referrer.
+	 *    Actually, important actions should not be triggered by Links / GET-Requests at all, but somethimes they still are,
+	 *    so this mechanism brings in some damage control (the attacker would be able to forge a request to a form of this type, but not to forms of other types).
+	 */
+	public static function getFormSecurityToken($typename = '')
+	{
+		$a = \get_app();
+
+		$timestamp = time();
+		$sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $timestamp . $typename);
+
+		return $timestamp . '.' . $sec_hash;
+	}
+
+	public static function checkFormSecurityToken($typename = '', $formname = 'form_security_token')
+	{
+		$hash = null;
+
+		if (!empty($_REQUEST[$formname])) {
+			/// @TODO Careful, not secured!
+			$hash = $_REQUEST[$formname];
+		}
+
+		if (!empty($_SERVER['HTTP_X_CSRF_TOKEN'])) {
+			/// @TODO Careful, not secured!
+			$hash = $_SERVER['HTTP_X_CSRF_TOKEN'];
+		}
+
+		if (empty($hash)) {
+			return false;
+		}
+
+		$max_livetime = 10800; // 3 hours
+
+		$a = \get_app();
+
+		$x = explode('.', $hash);
+		if (time() > (IntVal($x[0]) + $max_livetime)) {
+			return false;
+		}
+
+		$sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $x[0] . $typename);
+
+		return ($sec_hash == $x[1]);
+	}
+
+	public static function getFormSecurityStandardErrorMessage()
+	{
+		return L10n::t("The form security token was not correct. This probably happened because the form has been opened for too long \x28>3 hours\x29 before submitting it.") . EOL;
+	}
+
+	public static function checkFormSecurityTokenRedirectOnError($err_redirect, $typename = '', $formname = 'form_security_token')
+	{
+		if (!self::checkFormSecurityToken($typename, $formname)) {
+			$a = \get_app();
+			Logger::log('checkFormSecurityToken failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
+			Logger::log('checkFormSecurityToken failed: _REQUEST data: ' . print_r($_REQUEST, true), Logger::DATA);
+			notice(self::getFormSecurityStandardErrorMessage());
+			$a->internalRedirect($err_redirect);
+		}
+	}
+
+	public static function checkFormSecurityTokenForbiddenOnError($typename = '', $formname = 'form_security_token')
+	{
+		if (!self::checkFormSecurityToken($typename, $formname)) {
+			$a = \get_app();
+			Logger::log('checkFormSecurityToken failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
+			Logger::log('checkFormSecurityToken failed: _REQUEST data: ' . print_r($_REQUEST, true), Logger::DATA);
+
+			System::httpExit(403);
+		}
+	}
 }