mirror of https://github.com/friendica/friendica
273 lines
8.0 KiB
PHP
273 lines
8.0 KiB
PHP
<?php
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/**
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* @file /src/Util/Security.php
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*/
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namespace Friendica\Util;
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use Friendica\BaseObject;
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use Friendica\Database\DBA;
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use Friendica\Model\Contact;
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use Friendica\Model\Group;
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use Friendica\Core\L10n;
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use Friendica\Model\PermissionSet;
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use Friendica\Core\System;
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/**
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* Secures that User is allow to do requests
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*/
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class Security extends BaseObject
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{
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public static function can_write_wall($owner)
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{
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static $verified = 0;
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if (!local_user() && !remote_user()) {
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return false;
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}
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$uid = local_user();
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if ($uid == $owner) {
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return true;
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}
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if (local_user() && ($owner == 0)) {
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return true;
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}
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if (remote_user()) {
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// use remembered decision and avoid a DB lookup for each and every display item
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// DO NOT use this function if there are going to be multiple owners
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// We have a contact-id for an authenticated remote user, this block determines if the contact
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// belongs to this page owner, and has the necessary permissions to post content
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if ($verified === 2) {
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return true;
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} elseif ($verified === 1) {
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return false;
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} else {
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$cid = 0;
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if (!empty($_SESSION['remote'])) {
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foreach ($_SESSION['remote'] as $visitor) {
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if ($visitor['uid'] == $owner) {
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$cid = $visitor['cid'];
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break;
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}
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}
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}
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if (!$cid) {
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return false;
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}
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$r = q("SELECT `contact`.*, `user`.`page-flags` FROM `contact` INNER JOIN `user` on `user`.`uid` = `contact`.`uid`
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WHERE `contact`.`uid` = %d AND `contact`.`id` = %d AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0
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AND `user`.`blockwall` = 0 AND `readonly` = 0 AND ( `contact`.`rel` IN ( %d , %d ) OR `user`.`page-flags` = %d ) LIMIT 1",
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intval($owner),
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intval($cid),
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intval(Contact::SHARING),
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intval(Contact::FRIEND),
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intval(Contact::PAGE_COMMUNITY)
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);
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if (DBA::isResult($r)) {
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$verified = 2;
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return true;
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} else {
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$verified = 1;
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}
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}
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}
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return false;
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}
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/// @TODO $groups should be array
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public static function permissions_sql($owner_id, $remote_verified = false, $groups = null)
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{
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$local_user = local_user();
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$remote_user = remote_user();
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/**
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* Construct permissions
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*
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* default permissions - anonymous user
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*/
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$sql = " AND allow_cid = ''
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AND allow_gid = ''
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AND deny_cid = ''
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AND deny_gid = ''
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";
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/**
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* Profile owner - everything is visible
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*/
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if ($local_user && $local_user == $owner_id) {
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$sql = '';
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/**
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* Authenticated visitor. Unless pre-verified,
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* check that the contact belongs to this $owner_id
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* and load the groups the visitor belongs to.
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* If pre-verified, the caller is expected to have already
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* done this and passed the groups into this function.
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*/
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} elseif ($remote_user) {
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/*
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* Authenticated visitor. Unless pre-verified,
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* check that the contact belongs to this $owner_id
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* and load the groups the visitor belongs to.
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* If pre-verified, the caller is expected to have already
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* done this and passed the groups into this function.
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*/
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if (!$remote_verified) {
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if (DBA::exists('contact', ['id' => $remote_user, 'uid' => $owner_id, 'blocked' => false])) {
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$remote_verified = true;
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$groups = Group::getIdsByContactId($remote_user);
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}
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}
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if ($remote_verified) {
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$gs = '<<>>'; // should be impossible to match
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if (is_array($groups)) {
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foreach ($groups as $g) {
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$gs .= '|<' . intval($g) . '>';
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}
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}
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$sql = sprintf(
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" AND ( NOT (deny_cid REGEXP '<%d>' OR deny_gid REGEXP '%s')
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AND ( allow_cid REGEXP '<%d>' OR allow_gid REGEXP '%s' OR ( allow_cid = '' AND allow_gid = '') )
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)
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",
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intval($remote_user),
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DBA::escape($gs),
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intval($remote_user),
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DBA::escape($gs)
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);
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}
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}
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return $sql;
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}
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public static function item_permissions_sql($owner_id, $remote_verified = false, $groups = null)
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{
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$local_user = local_user();
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$remote_user = remote_user();
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/*
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* Construct permissions
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*
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* default permissions - anonymous user
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*/
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$sql = " AND NOT `item`.`private`";
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// Profile owner - everything is visible
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if ($local_user && ($local_user == $owner_id)) {
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$sql = '';
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} elseif ($remote_user) {
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/*
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* Authenticated visitor. Unless pre-verified,
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* check that the contact belongs to this $owner_id
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* and load the groups the visitor belongs to.
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* If pre-verified, the caller is expected to have already
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* done this and passed the groups into this function.
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*/
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$set = PermissionSet::get($owner_id, $remote_user, $groups);
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if (!empty($set)) {
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$sql_set = " OR (`item`.`private` IN (1,2) AND `item`.`wall` AND `item`.`psid` IN (" . implode(',', $set) . "))";
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} else {
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$sql_set = '';
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}
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$sql = " AND (NOT `item`.`private`" . $sql_set . ")";
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}
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return $sql;
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}
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/*
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* Functions used to protect against Cross-Site Request Forgery
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* The security token has to base on at least one value that an attacker can't know - here it's the session ID and the private key.
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* In this implementation, a security token is reusable (if the user submits a form, goes back and resubmits the form, maybe with small changes;
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* or if the security token is used for ajax-calls that happen several times), but only valid for a certain amout of time (3hours).
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* The "typename" seperates the security tokens of different types of forms. This could be relevant in the following case:
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* A security token is used to protekt a link from CSRF (e.g. the "delete this profile"-link).
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* If the new page contains by any chance external elements, then the used security token is exposed by the referrer.
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* Actually, important actions should not be triggered by Links / GET-Requests at all, but somethimes they still are,
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* so this mechanism brings in some damage control (the attacker would be able to forge a request to a form of this type, but not to forms of other types).
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*/
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public static function get_form_security_token($typename = '')
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{
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$a = get_app();
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$timestamp = time();
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$sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $timestamp . $typename);
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return $timestamp . '.' . $sec_hash;
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}
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public static function check_form_security_token($typename = '', $formname = 'form_security_token')
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{
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$hash = null;
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if (!empty($_REQUEST[$formname])) {
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/// @TODO Careful, not secured!
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$hash = $_REQUEST[$formname];
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}
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if (!empty($_SERVER['HTTP_X_CSRF_TOKEN'])) {
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/// @TODO Careful, not secured!
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$hash = $_SERVER['HTTP_X_CSRF_TOKEN'];
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}
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if (empty($hash)) {
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return false;
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}
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$max_livetime = 10800; // 3 hours
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$a = get_app();
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$x = explode('.', $hash);
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if (time() > (IntVal($x[0]) + $max_livetime)) {
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return false;
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}
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$sec_hash = hash('whirlpool', $a->user['guid'] . $a->user['prvkey'] . session_id() . $x[0] . $typename);
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return ($sec_hash == $x[1]);
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}
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private static function check_form_security_std_err_msg()
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{
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return L10n::t("The form security token was not correct. This probably happened because the form has been opened for too long \x28>3 hours\x29 before submitting it.") . EOL;
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}
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public static function check_form_security_token_redirectOnErr($err_redirect, $typename = '', $formname = 'form_security_token')
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{
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if (!check_form_security_token($typename, $formname)) {
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$a = get_app();
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logger('check_form_security_token failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
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logger('check_form_security_token failed: _REQUEST data: ' . print_r($_REQUEST, true), LOGGER_DATA);
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notice(check_form_security_std_err_msg());
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goaway(System::baseUrl() . $err_redirect);
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}
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}
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public static function check_form_security_token_ForbiddenOnErr($typename = '', $formname = 'form_security_token')
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{
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if (!check_form_security_token($typename, $formname)) {
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$a = get_app();
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logger('check_form_security_token failed: user ' . $a->user['guid'] . ' - form element ' . $typename);
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logger('check_form_security_token failed: _REQUEST data: ' . print_r($_REQUEST, true), LOGGER_DATA);
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header('HTTP/1.1 403 Forbidden');
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killme();
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}
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}
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}
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?>
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