Issues (111)

Security Analysis    not enabled

This project does not seem to handle request data directly as such no vulnerable execution paths were found.

  Cross-Site Scripting
Cross-Site Scripting enables an attacker to inject code into the response of a web-request that is viewed by other users. It can for example be used to bypass access controls, or even to take over other users' accounts.
  File Exposure
File Exposure allows an attacker to gain access to local files that he should not be able to access. These files can for example include database credentials, or other configuration files.
  File Manipulation
File Manipulation enables an attacker to write custom data to files. This potentially leads to injection of arbitrary code on the server.
  Object Injection
Object Injection enables an attacker to inject an object into PHP code, and can lead to arbitrary code execution, file exposure, or file manipulation attacks.
  Code Injection
Code Injection enables an attacker to execute arbitrary code on the server.
  Response Splitting
Response Splitting can be used to send arbitrary responses.
  File Inclusion
File Inclusion enables an attacker to inject custom files into PHP's file loading mechanism, either explicitly passed to include, or for example via PHP's auto-loading mechanism.
  Command Injection
Command Injection enables an attacker to inject a shell command that is execute with the privileges of the web-server. This can be used to expose sensitive data, or gain access of your server.
  SQL Injection
SQL Injection enables an attacker to execute arbitrary SQL code on your database server gaining access to user data, or manipulating user data.
  XPath Injection
XPath Injection enables an attacker to modify the parts of XML document that are read. If that XML document is for example used for authentication, this can lead to further vulnerabilities similar to SQL Injection.
  LDAP Injection
LDAP Injection enables an attacker to inject LDAP statements potentially granting permission to run unauthorized queries, or modify content inside the LDAP tree.
  Header Injection
  Other Vulnerability
This category comprises other attack vectors such as manipulating the PHP runtime, loading custom extensions, freezing the runtime, or similar.
  Regex Injection
Regex Injection enables an attacker to execute arbitrary code in your PHP process.
  XML Injection
XML Injection enables an attacker to read files on your local filesystem including configuration files, or can be abused to freeze your web-server process.
  Variable Injection
Variable Injection enables an attacker to overwrite program variables with custom data, and can lead to further vulnerabilities.
Unfortunately, the security analysis is currently not available for your project. If you are a non-commercial open-source project, please contact support to gain access.

classes/locallib/bigbluebutton.php (4 issues)

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1
<?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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 * The mod_bigbluebuttonbn locallib/bigbluebutton.
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 *
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 * @package   mod_bigbluebuttonbn
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 * @copyright 2010 onwards, Blindside Networks Inc
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 * @author    Jesus Federico  (jesus [at] blindsidenetworks [dt] com)
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 */
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namespace mod_bigbluebuttonbn\locallib;
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use context_module;
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defined('MOODLE_INTERNAL') || die();
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global $CFG;
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require_once($CFG->dirroot . '/mod/bigbluebuttonbn/locallib.php');
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/**
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 * Wrapper for executing http requests on a BigBlueButton server.
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 *
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 * @copyright 2010 onwards, Blindside Networks Inc
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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 bigbluebutton {
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    /**
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     * Returns the right URL for the action specified.
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     *
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     * @param string $action
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     * @param array  $data
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     * @param array  $metadata
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     * @return string
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     */
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    public static function action_url($action = '', $data = array(), $metadata = array()) {
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        $baseurl = self::sanitized_url() . $action . '?';
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        $metadata = array_combine(
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            array_map(
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                function($k) {
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                    return 'meta_' . $k;
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                }
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                , array_keys($metadata)
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            ),
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            $metadata
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        );
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        $params = http_build_query($data + $metadata, '', '&');
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        return $baseurl . $params . '&checksum=' . sha1($action . $params . self::sanitized_secret());
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    }
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    /**
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     * Makes sure the url used doesn't is in the format required.
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     *
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     * @return string
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     */
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    public static function sanitized_url() {
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        $serverurl = trim(config::get('server_url'));
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        if (substr($serverurl, -1) == '/') {
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            $serverurl = rtrim($serverurl, '/');
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        }
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        if (substr($serverurl, -4) == '/api') {
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            $serverurl = rtrim($serverurl, '/api');
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        }
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        return $serverurl . '/api/';
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    }
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    /**
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     * Makes sure the shared_secret used doesn't have trailing white characters.
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     *
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     * @return string
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     */
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    public static function sanitized_secret() {
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        return trim(config::get('shared_secret'));
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    }
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    /**
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     * Returns the BigBlueButton server root URL.
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     *
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     * @return string
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     */
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    public static function root() {
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        $pserverurl = parse_url(trim(config::get('server_url')));
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        $pserverurlport = "";
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        if (isset($pserverurl['port'])) {
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            $pserverurlport = ":" . $pserverurl['port'];
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        }
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        return $pserverurl['scheme'] . "://" . $pserverurl['host'] . $pserverurlport . "/";
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    }
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    /**
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     * Get BBB session information from viewinstance
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     *
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     * @param object $viewinstance
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     * @return mixed
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     * @throws \coding_exception
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     * @throws \dml_exception
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     * @throws \moodle_exception
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     * @throws \require_login_exception
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     * @throws \required_capability_exception
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     */
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    public static function build_bbb_session_fromviewinstance($viewinstance) {
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        $cm = $viewinstance['cm'];
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        $course = $viewinstance['course'];
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        $bigbluebuttonbn = $viewinstance['bigbluebuttonbn'];
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        return self::build_bbb_session($cm, $course, $bigbluebuttonbn);
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    }
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    /**
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     * Get BBB session from parameters
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     *
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     * @param \course_modinfo $cm
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     * @param object $course
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     * @param object $bigbluebuttonbn
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     * @return mixed
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     * @throws \coding_exception
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     * @throws \dml_exception
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     * @throws \moodle_exception
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     * @throws \require_login_exception
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     * @throws \required_capability_exception
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     */
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    public static function build_bbb_session($cm, $course, $bigbluebuttonbn) {
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        global $CFG;
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        $context = context_module::instance($cm->id);
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        require_login($course->id, false, $cm, true, true);
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        require_capability('mod/bigbluebuttonbn:join', $context);
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        // Add view event.
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        bigbluebuttonbn_event_log(\mod_bigbluebuttonbn\event\events::$events['view'], $bigbluebuttonbn);
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        // Create array bbbsession with configuration for BBB server.
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        $bbbsession['course'] = $course;
0 ignored issues
show
Coding Style Comprehensibility introduced by
$bbbsession was never initialized. Although not strictly required by PHP, it is generally a good practice to add $bbbsession = array(); before regardless.

Adding an explicit array definition is generally preferable to implicit array definition as it guarantees a stable state of the code.

Let’s take a look at an example:

foreach ($collection as $item) {
    $myArray['foo'] = $item->getFoo();

    if ($item->hasBar()) {
        $myArray['bar'] = $item->getBar();
    }

    // do something with $myArray
}

As you can see in this example, the array $myArray is initialized the first time when the foreach loop is entered. You can also see that the value of the bar key is only written conditionally; thus, its value might result from a previous iteration.

This might or might not be intended. To make your intention clear, your code more readible and to avoid accidental bugs, we recommend to add an explicit initialization $myArray = array() either outside or inside the foreach loop.

Loading history...
146
        $bbbsession['coursename'] = $course->fullname;
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        $bbbsession['cm'] = $cm;
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        $bbbsession['bigbluebuttonbn'] = $bigbluebuttonbn;
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        self::view_bbbsession_set($context, $bbbsession);
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        $serverversion = bigbluebuttonbn_get_server_version();
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        $bbbsession['serverversion'] = (string) $serverversion;
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        // Operation URLs.
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        $bbbsession['bigbluebuttonbnURL'] = $CFG->wwwroot . '/mod/bigbluebuttonbn/view.php?id=' . $cm->id;
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        $bbbsession['logoutURL'] = $CFG->wwwroot . '/mod/bigbluebuttonbn/bbb_view.php?action=logout&id=' . $cm->id .
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            '&bn=' . $bbbsession['bigbluebuttonbn']->id;
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        $bbbsession['recordingReadyURL'] = $CFG->wwwroot . '/mod/bigbluebuttonbn/bbb_broker.php?action=recording_' .
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            'ready&bigbluebuttonbn=' . $bbbsession['bigbluebuttonbn']->id;
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        $bbbsession['meetingEventsURL'] = $CFG->wwwroot . '/mod/bigbluebuttonbn/bbb_broker.php?action=meeting' .
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            '_events&bigbluebuttonbn=' . $bbbsession['bigbluebuttonbn']->id;
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        $bbbsession['joinURL'] = $CFG->wwwroot . '/mod/bigbluebuttonbn/bbb_view.php?action=join&id=' . $cm->id .
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            '&bn=' . $bbbsession['bigbluebuttonbn']->id;
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        return $bbbsession;
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    }
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    /**
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     * Build standard array with configurations required for BBB server.
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     *
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     * @param \context $context
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     * @param array $bbbsession
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     * @throws \coding_exception
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     * @throws \dml_exception
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     */
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    public static function view_bbbsession_set($context, &$bbbsession) {
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        global $CFG, $USER;
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        $bbbsession['username'] = fullname($USER);
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        $bbbsession['userID'] = $USER->id;
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        $bbbsession['administrator'] = is_siteadmin($bbbsession['userID']);
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        $participantlist = bigbluebuttonbn_get_participant_list($bbbsession['bigbluebuttonbn'], $context);
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        $bbbsession['moderator'] = bigbluebuttonbn_is_moderator($context, $participantlist);
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        $bbbsession['managerecordings'] = ($bbbsession['administrator']
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            || has_capability('mod/bigbluebuttonbn:managerecordings', $context));
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        $bbbsession['importrecordings'] = ($bbbsession['managerecordings']);
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        $bbbsession['modPW'] = $bbbsession['bigbluebuttonbn']->moderatorpass;
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        $bbbsession['viewerPW'] = $bbbsession['bigbluebuttonbn']->viewerpass;
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        $bbbsession['meetingid'] = $bbbsession['bigbluebuttonbn']->meetingid.'-'.$bbbsession['course']->id.'-'.
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            $bbbsession['bigbluebuttonbn']->id;
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        $bbbsession['meetingname'] = $bbbsession['bigbluebuttonbn']->name;
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        $bbbsession['meetingdescription'] = $bbbsession['bigbluebuttonbn']->intro;
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        $bbbsession['userlimit'] = intval((int) config::get('userlimit_default'));
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        if ((boolean) config::get('userlimit_editable')) {
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            $bbbsession['userlimit'] = intval($bbbsession['bigbluebuttonbn']->userlimit);
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        }
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        $bbbsession['voicebridge'] = $bbbsession['bigbluebuttonbn']->voicebridge;
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        if ($bbbsession['bigbluebuttonbn']->voicebridge > 0) {
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            $bbbsession['voicebridge'] = 70000 + $bbbsession['bigbluebuttonbn']->voicebridge;
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        }
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        $bbbsession['wait'] = $bbbsession['bigbluebuttonbn']->wait;
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        $bbbsession['record'] = $bbbsession['bigbluebuttonbn']->record;
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        $bbbsession['recordallfromstart'] = $CFG->bigbluebuttonbn_recording_all_from_start_default;
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        if ($CFG->bigbluebuttonbn_recording_all_from_start_editable) {
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            $bbbsession['recordallfromstart'] = $bbbsession['bigbluebuttonbn']->recordallfromstart;
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        }
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        $bbbsession['recordhidebutton'] = $CFG->bigbluebuttonbn_recording_hide_button_default;
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        if ($CFG->bigbluebuttonbn_recording_hide_button_editable) {
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            $bbbsession['recordhidebutton'] = $bbbsession['bigbluebuttonbn']->recordhidebutton;
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        }
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        $bbbsession['welcome'] = $bbbsession['bigbluebuttonbn']->welcome;
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        if (!isset($bbbsession['welcome']) || $bbbsession['welcome'] == '') {
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            $bbbsession['welcome'] = get_string('mod_form_field_welcome_default', 'bigbluebuttonbn');
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        }
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        if ($bbbsession['bigbluebuttonbn']->record) {
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            // Check if is enable record all from start.
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            if ($bbbsession['recordallfromstart']) {
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                $bbbsession['welcome'] .= '<br><br>'.get_string('bbbrecordallfromstartwarning',
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                        'bigbluebuttonbn');
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            } else {
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                $bbbsession['welcome'] .= '<br><br>'.get_string('bbbrecordwarning', 'bigbluebuttonbn');
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            }
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        }
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        $bbbsession['openingtime'] = $bbbsession['bigbluebuttonbn']->openingtime;
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        $bbbsession['closingtime'] = $bbbsession['bigbluebuttonbn']->closingtime;
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        $bbbsession['muteonstart'] = $bbbsession['bigbluebuttonbn']->muteonstart;
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        // Lock settings.
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        $bbbsession['disablecam'] = $bbbsession['bigbluebuttonbn']->disablecam;
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        $bbbsession['disablemic'] = $bbbsession['bigbluebuttonbn']->disablemic;
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        $bbbsession['disableprivatechat'] = $bbbsession['bigbluebuttonbn']->disableprivatechat;
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        $bbbsession['disablepublicchat'] = $bbbsession['bigbluebuttonbn']->disablepublicchat;
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        $bbbsession['disablenote'] = $bbbsession['bigbluebuttonbn']->disablenote;
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        $bbbsession['hideuserlist'] = $bbbsession['bigbluebuttonbn']->hideuserlist;
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        $bbbsession['lockedlayout'] = $bbbsession['bigbluebuttonbn']->lockedlayout;
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        $bbbsession['lockonjoin'] = $bbbsession['bigbluebuttonbn']->lockonjoin;
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        $bbbsession['lockonjoinconfigurable'] = $bbbsession['bigbluebuttonbn']->lockonjoinconfigurable;
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        // Additional info related to the course.
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        $bbbsession['context'] = $context;
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        // Metadata (origin).
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        $bbbsession['origin'] = 'Moodle';
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        $bbbsession['originVersion'] = $CFG->release;
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        $parsedurl = parse_url($CFG->wwwroot);
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        $bbbsession['originServerName'] = $parsedurl['host'];
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        $bbbsession['originServerUrl'] = $CFG->wwwroot;
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        $bbbsession['originServerCommonName'] = '';
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        $bbbsession['originTag'] = 'moodle-mod_bigbluebuttonbn ('.get_config('mod_bigbluebuttonbn', 'version').')';
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        $bbbsession['bnserver'] = bigbluebuttonbn_is_bn_server();
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        // Setting for clienttype, assign flash if not enabled, or default if not editable.
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        $bbbsession['clienttype'] = config::get('clienttype_default');
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        if (config::get('clienttype_editable')) {
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            $bbbsession['clienttype'] = $bbbsession['bigbluebuttonbn']->clienttype;
253
        }
254
        if (!config::clienttype_enabled()) {
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            $bbbsession['clienttype'] = BIGBLUEBUTTON_CLIENTTYPE_FLASH;
256
        }
257
    }
258
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    /**
260
     * Can join meeting.
261
     *
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     * @param int $cmid
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     * @return array|bool[]
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     * @throws \coding_exception
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     * @throws \dml_exception
266
     * @throws \moodle_exception
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     * @throws \require_login_exception
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     * @throws \required_capability_exception
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     */
270
    public static function can_join_meeting($cmid) {
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        global $CFG;
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        $canjoin = array('can_join' => false, 'message' => '');
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        $viewinstance = bigbluebuttonbn_view_validator($cmid, null);
0 ignored issues
show
null is of type null, but the function expects a object.

It seems like the type of the argument is not accepted by the function/method which you are calling.

In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.

We suggest to add an explicit type cast like in the following example:

function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
Loading history...
275
        if ($viewinstance) {
276
            $bbbsession = self::build_bbb_session_fromviewinstance($viewinstance);
0 ignored issues
show
$viewinstance is of type array, but the function expects a object.

It seems like the type of the argument is not accepted by the function/method which you are calling.

In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.

We suggest to add an explicit type cast like in the following example:

function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
Loading history...
277
            if ($bbbsession) {
0 ignored issues
show
Bug Best Practice introduced by
The expression $bbbsession of type array<string,string> is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.

Consider making the comparison explicit by using empty(..) or ! empty(...) instead.

Loading history...
278
                require_once($CFG->dirroot . "/mod/bigbluebuttonbn/brokerlib.php");
279
                $info = bigbluebuttonbn_get_meeting_info($bbbsession['meetingid'], false);
280
                $running = false;
281
                if ($info['returncode'] == 'SUCCESS') {
282
                    $running = ($info['running'] === 'true');
283
                }
284
                $participantcount = 0;
285
                if (isset($info['participantCount'])) {
286
                    $participantcount = $info['participantCount'];
287
                }
288
                $canjoin = bigbluebuttonbn_broker_meeting_info_can_join($bbbsession, $running, $participantcount);
289
            }
290
        }
291
        return $canjoin;
292
    }
293
}
294