<?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\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" => $_SERVER['REMOTE_ADDR']]); } 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'] = $_SERVER['REMOTE_ADDR']; $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'])) { $r = dba::fetch_first("SELECT * FROM `user` WHERE `uid` = ? LIMIT 1", intval($_SESSION['submanage']) ); if (DBM::is_result($r)) { $master_record = $r; } } if ($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); } $r = dba::fetch_first("SELECT * FROM `contact` WHERE `uid` = ? AND `self` LIMIT 1", $_SESSION['uid']); if (DBM::is_result($r)) { $a->contact = $r; $a->cid = $r['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 ' . $_SESSION['remember_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 == $owner) { return true; } if (remote_user()) { // use remembered decision and avoid a DB lookup for each and every display item // DO NOT use this function if there are going to be multiple owners // We have a contact-id for an authenticated remote user, this block determines if the contact // belongs to this page owner, and has the necessary permissions to post content if ($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 { $verified = 1; } } } return false; } function permissions_sql($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) { $sql = ''; } elseif ($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) . '>'; } $sql = sprintf( " AND ( NOT (deny_cid REGEXP '<%d>' OR deny_gid REGEXP '%s') AND ( allow_cid REGEXP '<%d>' OR allow_gid REGEXP '%s' OR ( allow_cid = '' AND allow_gid = '') ) ) ", intval($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 */ $sql = " AND `item`.allow_cid = '' AND `item`.allow_gid = '' AND `item`.deny_cid = '' AND `item`.deny_gid = '' AND `item`.private = 0 "; // Profile owner - everything is visible if ($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 = '', $formname = 'form_security_token') { if (!x($_REQUEST, $formname)) { return false; } /// @TODO Careful, not secured! $hash = $_REQUEST[$formname]; $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(); }