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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Verifies sanity of guest role
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*
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* @package core
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* @category check
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* @copyright 2020 Brendan Heywood <brendan@catalyst-au.net>
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* @copyright 2008 petr Skoda
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace core\check\access;
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defined('MOODLE_INTERNAL') || die();
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use core\check\check;
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use core\check\result;
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/**
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* Verifies sanity of guest role
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*
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* @copyright 2020 Brendan Heywood <brendan@catalyst-au.net>
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* @copyright 2008 petr Skoda
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class guestrole extends check {
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/**
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* Get the short check name
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*
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* @return string
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*/
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public function get_name(): string {
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return get_string('check_guestrole_name', 'report_security');
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}
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/**
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* A link to a place to action this
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*
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* @return \action_link|null
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*/
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public function get_action_link(): ?\action_link {
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return new \action_link(
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new \moodle_url('/admin/settings.php?section=userpolicies'),
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get_string('userpolicies', 'admin'));
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}
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/**
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* Return result
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* @return result
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*/
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public function get_result(): result {
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global $DB, $CFG;
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if (!$guestrole = $DB->get_record('role', ['id' => $CFG->guestroleid])) {
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$status = result::WARNING;
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$summary = get_string('check_guestrole_notset', 'report_security');
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return new result($status, $summary);
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}
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// Risky caps - usually very dangerous.
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$sql = "SELECT COUNT(DISTINCT rc.contextid)
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FROM {role_capabilities} rc
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JOIN {capabilities} cap ON cap.name = rc.capability
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WHERE " . $DB->sql_bitand('cap.riskbitmask', (RISK_XSS | RISK_CONFIG | RISK_DATALOSS)) . " <> 0
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AND rc.permission = :capallow
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AND rc.roleid = :roleid";
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$riskycount = $DB->count_records_sql($sql, [
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'capallow' => CAP_ALLOW,
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'roleid' => $guestrole->id,
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]);
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// It may have either no or 'guest' archetype - nothing else, or else it would break during upgrades badly.
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if ($guestrole->archetype === '' or $guestrole->archetype === 'guest') {
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$legacyok = true;
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} else {
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$legacyok = false;
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}
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if ($riskycount or !$legacyok) {
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$status = result::CRITICAL;
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$summary = get_string('check_guestrole_error', 'report_security', format_string($guestrole->name));
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} else {
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$status = result::OK;
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$summary = get_string('check_guestrole_ok', 'report_security');
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}
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$details = get_string('check_guestrole_details', 'report_security');
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return new result($status, $summary, $details);
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}
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}
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