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