friendica/src/Security/Security.php

142 lines
3.8 KiB
PHP

<?php
/**
* @copyright Copyright (C) 2010-2024, the Friendica project
*
* @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\Security;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\Contact;
use Friendica\Model\Circle;
use Friendica\Model\User;
/**
* Secures that User is allow to do requests
*/
class Security
{
public static function canWriteToUserWall($owner)
{
static $verified = 0;
if (!DI::userSession()->isAuthenticated()) {
return false;
}
$uid = DI::userSession()->getLocalUserId();
if ($uid == $owner) {
return true;
}
if (DI::userSession()->getLocalUserId() && ($owner == 0)) {
return true;
}
if (!empty($cid = DI::userSession()->getRemoteContactID($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
// belongs to this page owner, and has the necessary permissions to post content
if ($verified === 2) {
return true;
} elseif ($verified === 1) {
return false;
} else {
$user = User::getById($owner);
if (!$user || $user['blockwall']) {
$verified = 1;
return false;
}
$contact = Contact::getById($cid);
if ($contact || $contact['blocked'] || $contact['readonly'] || $contact['pending']) {
$verified = 1;
return false;
}
if (in_array($contact['rel'], [Contact::SHARING, Contact::FRIEND]) || ($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY)) {
$verified = 2;
return true;
} else {
$verified = 1;
}
}
}
return false;
}
/**
* 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 = DI::userSession()->getLocalUserId();
$remote_contact = DI::userSession()->getRemoteContactID($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 = ''" . $acc_sql . ") ";
/*
* Profile owner - everything is visible
*/
if ($local_user && $local_user == $owner_id) {
$sql = '';
/*
* Authenticated visitor. Load the circles the visitor belongs to.
*/
} elseif ($remote_contact) {
$circleIds = '<<>>'; // should be impossible to match
foreach (Circle::getIdsByContactId($remote_contact) as $circleId) {
$circleIds .= '|<' . intval($circleId) . '>';
}
$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($circleIds),
intval($remote_contact),
DBA::escape($circleIds)
);
}
return $sql;
}
}