<?php
/**
- * @file /src/Util/Security.php
+ * @copyright Copyright (C) 2020, Friendica
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
*/
namespace Friendica\Util;
-use Friendica\BaseObject;
use Friendica\Database\DBA;
use Friendica\Model\Contact;
use Friendica\Model\Group;
-use Friendica\Core\L10n;
-use Friendica\Model\PermissionSet;
-use Friendica\Core\System;
+use Friendica\Model\User;
+use Friendica\Core\Session;
/**
* Secures that User is allow to do requests
*/
-class Security extends BaseObject
+class Security
{
- public static function can_write_wall($owner)
+ public static function canWriteToUserWall($owner)
{
static $verified = 0;
- if (!local_user() && !remote_user()) {
+ if (!Session::isAuthenticated()) {
return false;
}
return true;
}
- if (remote_user()) {
+ if (!empty(Session::getRemoteContactID($owner))) {
// use remembered decision and avoid a DB lookup for each and every display item
// DO NOT use this function if there are going to be multiple owners
// We have a contact-id for an authenticated remote user, this block determines if the contact
} elseif ($verified === 1) {
return false;
} else {
- $cid = 0;
-
- if (!empty($_SESSION['remote'])) {
- foreach ($_SESSION['remote'] as $visitor) {
- if ($visitor['uid'] == $owner) {
- $cid = $visitor['cid'];
- break;
- }
- }
- }
-
+ $cid = Session::getRemoteContactID($owner);
if (!$cid) {
return false;
}
$r = q("SELECT `contact`.*, `user`.`page-flags` FROM `contact` INNER JOIN `user` on `user`.`uid` = `contact`.`uid`
WHERE `contact`.`uid` = %d AND `contact`.`id` = %d AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0
- AND `user`.`blockwall` = 0 AND `readonly` = 0 AND ( `contact`.`rel` IN ( %d , %d ) OR `user`.`page-flags` = %d ) LIMIT 1",
+ AND `user`.`blockwall` = 0 AND `readonly` = 0 AND (`contact`.`rel` IN (%d , %d) OR `user`.`page-flags` = %d) LIMIT 1",
intval($owner),
intval($cid),
intval(Contact::SHARING),
intval(Contact::FRIEND),
- intval(Contact::PAGE_COMMUNITY)
+ intval(User::PAGE_FLAGS_COMMUNITY)
);
if (DBA::isResult($r)) {
return false;
}
- /// @TODO $groups should be array
- public static function permissions_sql($owner_id, $remote_verified = false, $groups = null)
+ /**
+ * Create a permission string for an element based on the visitor
+ *
+ * @param integer $owner_id User ID of the owner of the element
+ * @param boolean $accessible Should the element be accessible anyway?
+ * @return string SQL permissions
+ */
+ public static function getPermissionsSQLByUserId(int $owner_id, bool $accessible = false)
{
$local_user = local_user();
- $remote_user = remote_user();
+ $remote_contact = Session::getRemoteContactID($owner_id);
+ $acc_sql = '';
- /**
+ if ($accessible) {
+ $acc_sql = ' OR `accessible`';
+ }
+
+ /*
* Construct permissions
*
* default permissions - anonymous user
*/
- $sql = " AND allow_cid = ''
- AND allow_gid = ''
- AND deny_cid = ''
- AND deny_gid = ''
- ";
+ $sql = " AND (allow_cid = ''
+ AND allow_gid = ''
+ AND deny_cid = ''
+ AND deny_gid = ''" . $acc_sql . ") ";
- /**
+ /*
* Profile owner - everything is visible
*/
if ($local_user && $local_user == $owner_id) {
$sql = '';
- /**
- * Authenticated visitor. Unless pre-verified,
- * check that the contact belongs to this $owner_id
- * and load the groups the visitor belongs to.
- * If pre-verified, the caller is expected to have already
- * done this and passed the groups into this function.
- */
- } elseif ($remote_user) {
- /*
- * Authenticated visitor. Unless pre-verified,
- * check that the contact belongs to this $owner_id
- * and load the groups the visitor belongs to.
- * If pre-verified, the caller is expected to have already
- * done this and passed the groups into this function.
- */
-
- if (!$remote_verified) {
- if (DBA::exists('contact', ['id' => $remote_user, 'uid' => $owner_id, 'blocked' => false])) {
- $remote_verified = true;
- $groups = Group::getIdsByContactId($remote_user);
- }
- }
-
- if ($remote_verified) {
- $gs = '<<>>'; // should be impossible to match
-
- if (is_array($groups)) {
- foreach ($groups as $g) {
- $gs .= '|<' . intval($g) . '>';
- }
- }
-
- $sql = sprintf(
- " AND ( NOT (deny_cid REGEXP '<%d>' OR deny_gid REGEXP '%s')
- AND ( allow_cid REGEXP '<%d>' OR allow_gid REGEXP '%s' OR ( allow_cid = '' AND allow_gid = '') )
- )
- ",
- intval($remote_user),
- DBA::escape($gs),
- intval($remote_user),
- DBA::escape($gs)
- );
- }
- }
- return $sql;
- }
-
- public static function item_permissions_sql($owner_id, $remote_verified = false, $groups = null)
- {
- $local_user = local_user();
- $remote_user = remote_user();
-
/*
- * Construct permissions
- *
- * default permissions - anonymous user
+ * Authenticated visitor. Load the groups the visitor belongs to.
*/
- $sql = " AND NOT `item`.`private`";
+ } elseif ($remote_contact) {
+ $gs = '<<>>'; // should be impossible to match
- // Profile owner - everything is visible
- if ($local_user && ($local_user == $owner_id)) {
- $sql = '';
- } elseif ($remote_user) {
- /*
- * Authenticated visitor. Unless pre-verified,
- * check that the contact belongs to this $owner_id
- * and load the groups the visitor belongs to.
- * If pre-verified, the caller is expected to have already
- * done this and passed the groups into this function.
- */
- $set = PermissionSet::get($owner_id, $remote_user, $groups);
+ $groups = Group::getIdsByContactId($remote_contact);
- if (!empty($set)) {
- $sql_set = " OR (`item`.`private` IN (1,2) AND `item`.`wall` AND `item`.`psid` IN (" . implode(',', $set) . "))";
- } else {
- $sql_set = '';
+ if (is_array($groups)) {
+ foreach ($groups as $g) {
+ $gs .= '|<' . intval($g) . '>';
+ }
}
- $sql = " AND (NOT `item`.`private`" . $sql_set . ")";
+ $sql = sprintf(
+ " AND (NOT (deny_cid REGEXP '<%d>' OR deny_gid REGEXP '%s')
+ AND (allow_cid REGEXP '<%d>' OR allow_gid REGEXP '%s'
+ OR (allow_cid = '' AND allow_gid = ''))" . $acc_sql . ") ",
+ intval($remote_contact),
+ DBA::escape($gs),
+ intval($remote_contact),
+ DBA::escape($gs)
+ );
}
-
return $sql;
}
-
- /*
- * Functions used to protect against Cross-Site Request Forgery
- * The security token has to base on at least one value that an attacker can't know - here it's the session ID and the private key.
- * In this implementation, a security token is reusable (if the user submits a form, goes back and resubmits the form, maybe with small changes;
- * or if the security token is used for ajax-calls that happen several times), but only valid for a certain amout of time (3hours).
- * The "typename" seperates the security tokens of different types of forms. This could be relevant in the following case:
- * A security token is used to protekt a link from CSRF (e.g. the "delete this profile"-link).
- * If the new page contains by any chance external elements, then the used security token is exposed by the referrer.
- * Actually, important actions should not be triggered by Links / GET-Requests at all, but somethimes they still are,
- * so this mechanism brings in some damage control (the attacker would be able to forge a request to a form of this type, but not to forms of other types).
- */
- public static function get_form_security_token($typename = '')
- {
- $a = get_app();
-
- $timestamp = time();
- $sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $timestamp . $typename);
-
- return $timestamp . '.' . $sec_hash;
- }
-
- public static function check_form_security_token($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 == $x[1]);
- }
-
- private static function check_form_security_std_err_msg()
- {
- return L10n::t("The form security token was not correct. This probably happened because the form has been opened for too long \x28>3 hours\x29 before submitting it.") . EOL;
- }
-
- public static function check_form_security_token_redirectOnErr($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(System::baseUrl() . $err_redirect);
- }
- }
-
- public static function check_form_security_token_ForbiddenOnErr($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();
- }
- }
}
-
-?>
\ No newline at end of file
projects / friendica.git / blobdiff