Merge pull request #408 from CyberDomovoy/diaspora

[friendica.git] / include / security.php

diff --git a/include/security.php b/include/security.php
old mode 100755 (executable)
new mode 100644 (file)
index 8c536b6..af201d2
--- a/include/security.php
+++ b/include/security.php
@@ -9,6 +9,7 @@ function authenticate_success($user_record, $login_initial = false, $interactive
        $_SESSION['authenticated'] = 1;
        $_SESSION['page_flags'] = $user_record['page-flags'];
        $_SESSION['my_url'] = $a->get_baseurl() . '/profile/' . $user_record['nickname'];
+       $_SESSION['my_address'] = $user_record['nickname'] . '@' . substr($a->get_baseurl(),strpos($a->get_baseurl(),'://')+3);
        $_SESSION['addr'] = $_SERVER['REMOTE_ADDR'];
 
        $a->user = $user_record;
@@ -75,7 +76,7 @@ function authenticate_success($user_record, $login_initial = false, $interactive
        header('X-Account-Management-Status: active; name="' . $a->user['username'] . '"; id="' . $a->user['nickname'] .'"');
 
        if($login_initial) {
-               $l = get_language();
+               $l = get_browser_language();
 
                q("UPDATE `user` SET `login_date` = '%s', `language` = '%s' WHERE `uid` = %d LIMIT 1",
                        dbesc(datetime_convert()),
@@ -288,3 +289,60 @@ function item_permissions_sql($owner_id,$remote_verified = false,$groups = null)
 }
 
 
+/*
+ * 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).
+ */ 
+function get_form_security_token($typename = '') {
+       $a = get_app();
+       
+       $timestamp = time();
+       $sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $timestamp . $typename);
+       
+       return $timestamp . '.' . $sec_hash;
+}
+
+function check_form_security_token($typename = '', $formname = 'form_security_token') {
+       if (!x($_REQUEST, $formname)) return false;
+       $hash = $_REQUEST[$formname];
+       
+       $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 == $x[1]);
+}
+
+function check_form_security_std_err_msg() {
+       return t('The form security token was not correct. This probably happened because the form has been opened for too long (>3 hours) before submitting it.') . EOL;
+}
+function check_form_security_token_redirectOnErr($err_redirect, $typename = '', $formname = 'form_security_token') {
+       if (!check_form_security_token($typename, $formname)) {
+               $a = get_app();
+               logger('check_form_security_token failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
+               logger('check_form_security_token failed: _REQUEST data: ' . print_r($_REQUEST, true), LOGGER_DATA);
+               notice( check_form_security_std_err_msg() );
+               goaway($a->get_baseurl() . $err_redirect );
+       }
+}
+function check_form_security_token_ForbiddenOnErr($typename = '', $formname = 'form_security_token') {
+       if (!check_form_security_token($typename, $formname)) {
+           $a = get_app();
+               logger('check_form_security_token failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
+               logger('check_form_security_token failed: _REQUEST data: ' . print_r($_REQUEST, true), LOGGER_DATA);
+               header('HTTP/1.1 403 Forbidden');
+               killme();
+       }
+}