Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @file include/security.php
*/
use Friendica\Core\Addon;
use Friendica\Core\Config;
use Friendica\Core\L10n;
use Friendica\Core\PConfig;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\Database\DBM;
use Friendica\Model\Group;
use Friendica\Util\DateTimeFormat;
/**
* @brief Calculate the hash that is needed for the "Friendica" cookie
*
* @param array $user Record from "user" table
*
* @return string Hashed data
*/
function cookie_hash($user)
{
return(hash("sha256", Config::get("system", "site_prvkey") .
$user["prvkey"] .
$user["password"]));
}
/**
* @brief Set the "Friendica" cookie
*
* @param int $time
* @param array $user Record from "user" table
*/
function new_cookie($time, $user = [])
{
if ($time != 0) {
$time = $time + time();
}
if ($user) {
$value = json_encode(["uid" => $user["uid"],
"hash" => cookie_hash($user),
"ip" => defaults($_SERVER, 'REMOTE_ADDR', '0.0.0.0')]);
} else {
$value = "";
}
setcookie("Friendica", $value, $time, "/", "", (Config::get('system', 'ssl_policy') == SSL_POLICY_FULL), true);
}
/**
* @brief Sets the provided user's authenticated session
*
* @todo Should be moved to Friendica\Core\Session once it's created
*
* @param type $user_record
* @param type $login_initial
* @param type $interactive
* @param type $login_refresh
*/
function authenticate_success($user_record, $login_initial = false, $interactive = false, $login_refresh = false)
{
$a = get_app();
$_SESSION['uid'] = $user_record['uid'];
$_SESSION['theme'] = $user_record['theme'];
$_SESSION['mobile-theme'] = PConfig::get($user_record['uid'], 'system', 'mobile_theme');
$_SESSION['authenticated'] = 1;
$_SESSION['page_flags'] = $user_record['page-flags'];
$_SESSION['my_url'] = System::baseUrl() . '/profile/' . $user_record['nickname'];
$_SESSION['my_address'] = $user_record['nickname'] . '@' . substr(System::baseUrl(), strpos(System::baseUrl(), '://') + 3);
$_SESSION['addr'] = defaults($_SERVER, 'REMOTE_ADDR', '0.0.0.0');
$a->user = $user_record;
if ($interactive) {
if ($a->user['login_date'] <= NULL_DATE) {
$_SESSION['return_url'] = 'profile_photo/new';
$a->module = 'profile_photo';
info(L10n::t("Welcome ") . $a->user['username'] . EOL);
info(L10n::t('Please upload a profile photo.') . EOL);
} else {
info(L10n::t("Welcome back ") . $a->user['username'] . EOL);
}
}
$member_since = strtotime($a->user['register_date']);
if (time() < ($member_since + ( 60 * 60 * 24 * 14))) {
$_SESSION['new_member'] = true;
} else {
$_SESSION['new_member'] = false;
}
if (strlen($a->user['timezone'])) {
date_default_timezone_set($a->user['timezone']);
$a->timezone = $a->user['timezone'];
}
$master_record = $a->user;
if ((x($_SESSION, 'submanage')) && intval($_SESSION['submanage'])) {
$user = DBA::selectFirst('user', [], ['uid' => $_SESSION['submanage']]);
if (DBM::is_result($user)) {
$master_record = $user;
}
}
if ($master_record['parent-uid'] == 0) {
// First add our own entry
$a->identities = [['uid' => $master_record['uid'],
'username' => $master_record['username'],
'nickname' => $master_record['nickname']]];
// Then add all the children
$r = DBA::select('user', ['uid', 'username', 'nickname'],
['parent-uid' => $master_record['uid'], 'account_removed' => false]);
if (DBM::is_result($r)) {
$a->identities = array_merge($a->identities, DBA::inArray($r));
}
} else {
// Just ensure that the array is always defined
$a->identities = [];
// First entry is our parent
$r = DBA::select('user', ['uid', 'username', 'nickname'],
['uid' => $master_record['parent-uid'], 'account_removed' => false]);
if (DBM::is_result($r)) {
$a->identities = DBA::inArray($r);
}
// Then add all siblings
$r = DBA::select('user', ['uid', 'username', 'nickname'],
['parent-uid' => $master_record['parent-uid'], 'account_removed' => false]);
if (DBM::is_result($r)) {
$a->identities = array_merge($a->identities, DBA::inArray($r));
}
}
$r = DBA::p("SELECT `user`.`uid`, `user`.`username`, `user`.`nickname`
FROM `manage`
INNER JOIN `user` ON `manage`.`mid` = `user`.`uid`
WHERE `user`.`account_removed` = 0 AND `manage`.`uid` = ?",
$master_record['uid']
);
if (DBM::is_result($r)) {
$a->identities = array_merge($a->identities, DBA::inArray($r));
}
if ($login_initial) {
logger('auth_identities: ' . print_r($a->identities, true), LOGGER_DEBUG);
}
if ($login_refresh) {
logger('auth_identities refresh: ' . print_r($a->identities, true), LOGGER_DEBUG);
}
$contact = DBA::selectFirst('contact', [], ['uid' => $_SESSION['uid'], 'self' => true]);
if (DBM::is_result($contact)) {
$a->contact = $contact;
$a->cid = $contact['id'];
$_SESSION['cid'] = $a->cid;
}
header('X-Account-Management-Status: active; name="' . $a->user['username'] . '"; id="' . $a->user['nickname'] . '"');
if ($login_initial || $login_refresh) {
DBA::update('user', ['login_date' => DateTimeFormat::utcNow()], ['uid' => $_SESSION['uid']]);
// Set the login date for all identities of the user
DBA::update('user', ['login_date' => DateTimeFormat::utcNow()],
['parent-uid' => $master_record['uid'], 'account_removed' => false]);
}
if ($login_initial) {
/*
* If the user specified to remember the authentication, then set a cookie
* that expires after one week (the default is when the browser is closed).
* The cookie will be renewed automatically.
* The week ensures that sessions will expire after some inactivity.
*/
if ($_SESSION['remember']) {
logger('Injecting cookie for remembered user ' . $a->user['nickname']);
new_cookie(604800, $user_record);
unset($_SESSION['remember']);
}
}
if ($login_initial) {
Addon::callHooks('logged_in', $a->user);
if (($a->module !== 'home') && isset($_SESSION['return_url'])) {
goaway(System::baseUrl() . '/' . $_SESSION['return_url']);
}
}
}
function can_write_wall($owner)
{
static $verified = 0;
if (!local_user() && !remote_user()) {
return false;
}
$uid = local_user();
if ($uid == $owner) {
return true;
}
if (local_user() && ($owner == 0)) {
return true;
}
if (remote_user()) {
// 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 {
$cid = 0;
if (is_array($_SESSION['remote'])) {
foreach ($_SESSION['remote'] as $visitor) {
if ($visitor['uid'] == $owner) {
$cid = $visitor['cid'];
break;
}
}
}
if (!$cid) {
return false;
}
$r = q("SELECT `contact`.*, `user`.`page-flags` FROM `contact` INNER JOIN `user` on `user`.`uid` = `contact`.`uid`
WHERE `contact`.`uid` = %d AND `contact`.`id` = %d AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0
AND `user`.`blockwall` = 0 AND `readonly` = 0 AND ( `contact`.`rel` IN ( %d , %d ) OR `user`.`page-flags` = %d ) LIMIT 1",
intval($owner),
intval($cid),
intval(CONTACT_IS_SHARING),
intval(CONTACT_IS_FRIEND),
intval(PAGE_COMMUNITY)
);
if (DBM::is_result($r)) {
$verified = 2;
return true;
} else {
$verified = 1;
}
}
}
return false;
}
/// @TODO $groups should be array
function permissions_sql($owner_id, $remote_verified = false, $groups = null)
{
$local_user = local_user();
$remote_user = remote_user();
/**
* Construct permissions
*
* default permissions - anonymous user
*/
$sql = " AND allow_cid = ''
AND allow_gid = ''
AND deny_cid = ''
AND deny_gid = ''
";
/**
* Profile owner - everything is visible
*/
if ($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) {
$r = q("SELECT id FROM contact WHERE id = %d AND uid = %d AND blocked = 0 LIMIT 1",
intval($remote_user),
intval($owner_id)
);
if (DBM::is_result($r)) {
$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),
dbesc($gs),
intval($remote_user),
dbesc($gs)
);
}
}
return $sql;
}
function item_permissions_sql($owner_id, $remote_verified = false, $groups = null)
{
$local_user = local_user();
$remote_user = remote_user();
/*
* Construct permissions
*
* default permissions - anonymous user
*/
$sql = " AND `item`.allow_cid = ''
AND `item`.allow_gid = ''
AND `item`.deny_cid = ''
AND `item`.deny_gid = ''
AND `item`.private != 1
";
// Profile owner - everything is visible
if ($local_user && ($local_user == $owner_id)) {
$sql = '';
} elseif ($remote_user) {
/*
* Authenticated visitor. Unless pre-verified,
* check that the contact belongs to this $owner_id
* and load the groups the visitor belongs to.
* If pre-verified, the caller is expected to have already
* done this and passed the groups into this function.
*/
if (!$remote_verified) {
$r = q("SELECT id FROM contact WHERE id = %d AND uid = %d AND blocked = 0 LIMIT 1",
intval($remote_user),
intval($owner_id)
);
if (DBM::is_result($r)) {
$remote_verified = true;
$groups = Group::getIdsByContactId($remote_user);
}
}
if ($remote_verified) {
$gs = '<<>>'; // should be impossible to match
if (is_array($groups) && count($groups)) {
foreach ($groups as $g) {
$gs .= '|<' . intval($g) . '>';
}
}
$sql = sprintf(
" AND ( `item`.private = 0 OR ( `item`.private in (1,2) AND `item`.`wall` = 1
AND ( NOT (`item`.deny_cid REGEXP '<%d>' OR `item`.deny_gid REGEXP '%s')
AND ( `item`.allow_cid REGEXP '<%d>' OR `item`.allow_gid REGEXP '%s' OR ( `item`.allow_cid = '' AND `item`.allow_gid = '')))))
",
intval($remote_user),
dbesc($gs),
intval($remote_user),
dbesc($gs)
);
}
}
return $sql;
}
/*
* Functions used to protect against Cross-Site Request Forgery
* The security token has to base on at least one value that an attacker can't know - here it's the session ID and the private key.
* In this implementation, a security token is reusable (if the user submits a form, goes back and resubmits the form, maybe with small changes;
* or if the security token is used for ajax-calls that happen several times), but only valid for a certain amout of time (3hours).
* The "typename" seperates the security tokens of different types of forms. This could be relevant in the following case:
* A security token is used to protekt a link from CSRF (e.g. the "delete this profile"-link).
* If the new page contains by any chance external elements, then the used security token is exposed by the referrer.
* Actually, important actions should not be triggered by Links / GET-Requests at all, but somethimes they still are,
* so this mechanism brings in some damage control (the attacker would be able to forge a request to a form of this type, but not to forms of other types).
*/
function get_form_security_token($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')
{
$hash = null;
if (!empty($_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 == $x[1]);
}
function check_form_security_std_err_msg()
{
return L10n::t("The form security token was not correct. This probably happened because the form has been opened for too long \x28>3 hours\x29 before submitting it.") . EOL;
}
function check_form_security_token_redirectOnErr($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() . $err_redirect);
}
}
function check_form_security_token_ForbiddenOnErr($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();
}
}
/**
* @brief Kills the "Friendica" cookie and all session data
*/
function nuke_session()
{
new_cookie(-3600); // make sure cookie is deleted on browser close, as a security measure
session_unset();
session_destroy();
}