mirror of
https://github.com/moodle/moodle.git
synced 2025-01-19 14:27:22 +01:00
598 lines
22 KiB
PHP
598 lines
22 KiB
PHP
<?php
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/**
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* setup.php - Sets up sessions, connects to databases and so on
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*
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* Normally this is only called by the main config.php file
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* Normally this file does not need to be edited.
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* @author Martin Dougiamas
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* @version $Id$
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* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
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* @package moodlecore
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*/
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////// DOCUMENTATION IN PHPDOC FORMAT FOR MOODLE GLOBALS AND COMMON OBJECT TYPES /////////////
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/**
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* $USER is a global instance of a typical $user record.
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*
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* Items found in the user record:
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* - $USER->emailstop - Does the user want email sent to them?
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* - $USER->email - The user's email address.
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* - $USER->id - The unique integer identified of this user in the 'user' table.
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* - $USER->email - The user's email address.
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* - $USER->firstname - The user's first name.
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* - $USER->lastname - The user's last name.
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* - $USER->username - The user's login username.
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* - $USER->secret - The user's ?.
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* - $USER->lang - The user's language choice.
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*
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* @global object(user) $USER
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*/
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global $USER;
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/**
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* This global variable is read in from the 'config' table.
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*
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* Some typical settings in the $CFG global:
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* - $CFG->wwwroot - Path to moodle index directory in url format.
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* - $CFG->dataroot - Path to moodle index directory on server's filesystem.
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* - $CFG->libroot - Path to moodle's library folder on server's filesystem.
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*
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* @global object(cfg) $CFG
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*/
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global $CFG;
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/**
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* Definition of session type
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* @global object(session) $SESSION
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*/
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global $SESSION;
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/**
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* Definition of course type
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* @global object(course) $COURSE
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*/
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global $COURSE;
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/**
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* Definition of db type
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* @global object(db) $db
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*/
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global $db;
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/**
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* $THEME is a global that defines the site theme.
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*
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* Items found in the theme record:
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* - $THEME->cellheading - Cell colors.
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* - $THEME->cellheading2 - Alternate cell colors.
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*
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* @global object(theme) $THEME
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*/
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global $THEME;
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/**
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* HTTPSPAGEREQUIRED is a global to define if the page being displayed must run under HTTPS.
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*
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* It's primary goal is to allow 100% HTTPS pages when $CFG->loginhttps is enabled. Default to false.
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* It's enabled only by the httpsrequired() function and used in some pages to update some URLs
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*/
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global $HTTPSPAGEREQUIRED;
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/// First try to detect some attacks on older buggy PHP versions
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if (isset($_REQUEST['GLOBALS']) || isset($_COOKIE['GLOBALS']) || isset($_FILES['GLOBALS'])) {
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die('Fatal: Illegal GLOBALS overwrite attempt detected!');
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}
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if (!isset($CFG->wwwroot)) {
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trigger_error('Fatal: $CFG->wwwroot is not configured! Exiting.');
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die;
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}
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/// Set httpswwwroot default value (this variable will replace $CFG->wwwroot
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/// inside some URLs used in HTTPSPAGEREQUIRED pages.
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$CFG->httpswwwroot = $CFG->wwwroot;
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$CFG->libdir = $CFG->dirroot .'/lib';
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require_once($CFG->libdir .'/setuplib.php'); // Functions that MUST be loaded first
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/// Time to start counting
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init_performance_info();
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/// If there are any errors in the standard libraries we want to know!
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error_reporting(E_ALL);
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/// Just say no to link prefetching (Moz prefetching, Google Web Accelerator, others)
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/// http://www.google.com/webmasters/faq.html#prefetchblock
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if (!empty($_SERVER['HTTP_X_moz']) && $_SERVER['HTTP_X_moz'] === 'prefetch'){
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header($_SERVER['SERVER_PROTOCOL'] . ' 404 Prefetch Forbidden');
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trigger_error('Prefetch request forbidden.');
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exit;
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}
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/// Connect to the database using adodb
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/// Some defines required BEFORE including AdoDB library
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define ('ADODB_ASSOC_CASE', 0); //Use lowercase fieldnames for ADODB_FETCH_BOTH
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//(only meaningful for oci8po, it's the default
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//for other DB drivers so this won't affect them)
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require_once($CFG->libdir .'/adodb/adodb.inc.php'); // Database access functions
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$db = &ADONewConnection($CFG->dbtype);
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error_reporting(0); // Hide errors
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if (!isset($CFG->dbpersist) or !empty($CFG->dbpersist)) { // Use persistent connection (default)
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$dbconnected = $db->PConnect($CFG->dbhost,$CFG->dbuser,$CFG->dbpass,$CFG->dbname);
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} else { // Use single connection
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$dbconnected = $db->Connect($CFG->dbhost,$CFG->dbuser,$CFG->dbpass,$CFG->dbname);
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}
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if (! $dbconnected) {
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// In the name of protocol correctness, monitoring and performance
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// profiling, set the appropriate error headers for machine comsumption
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if (isset($_SERVER['SERVER_PROTOCOL'])) {
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// Avoid it with cron.php. Note that we assume it's HTTP/1.x
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header($_SERVER['SERVER_PROTOCOL'] . ' 503 Service Unavailable');
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}
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// and then for human consumption...
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echo '<html><body>';
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echo '<table align="center"><tr>';
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echo '<td style="color:#990000; text-align:center; font-size:large; border-width:1px; '.
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' border-color:#000000; border-style:solid; border-radius: 20px; border-collapse: collapse; '.
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' -moz-border-radius: 20px; padding: 15px">';
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echo '<p>Error: Database connection failed.</p>';
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echo '<p>It is possible that the database is overloaded or otherwise not running properly.</p>';
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echo '<p>The site administrator should also check that the database details have been correctly specified in config.php</p>';
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echo '</td></tr></table>';
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echo '</body></html>';
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if (!empty($CFG->emailconnectionerrorsto)) {
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mail($CFG->emailconnectionerrorsto,
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'WARNING: Database connection error: '.$CFG->wwwroot,
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'Connection error: '.$CFG->wwwroot);
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}
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die;
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}
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/// Force fetchmode of records for Execute() and SelectLimit() to BOTH
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/// (it isn't default in all the DB drivers. With the time we should
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/// try to migrate to FETCH_ASSOC, possible with some tricks in the
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/// recordset_to_array() function to maintain the id field properly.
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$db->SetFetchMode(ADODB_FETCH_BOTH);
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/// Starting here we have a correct DB conection but me must avoid
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/// to execute any DB transaction until "set names" has been executed
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/// some lines below!
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error_reporting(E_ALL); // Show errors from now on.
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if (!isset($CFG->prefix)) { // Just in case it isn't defined in config.php
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$CFG->prefix = '';
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}
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/// Define admin directory
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if (!isset($CFG->admin)) { // Just in case it isn't defined in config.php
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$CFG->admin = 'admin'; // This is relative to the wwwroot and dirroot
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}
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/// Load up standard libraries
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require_once($CFG->libdir .'/textlib.class.php'); // Functions to handle multibyte strings
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require_once($CFG->libdir .'/weblib.php'); // Functions for producing HTML
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require_once($CFG->libdir .'/dmllib.php'); // Functions to handle DB data (DML)
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require_once($CFG->libdir .'/datalib.php'); // Legacy lib with a big-mix of functions.
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require_once($CFG->libdir .'/moodlelib.php'); // Other general-purpose functions
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/// Increase memory limits if possible
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raise_memory_limit('64M'); // We should never NEED this much but just in case...
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/// If $CFG->unicodedb is not set, get it from database or calculate it because we need
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/// to know it to "set names" properly.
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/// (this is the only database interaction before "set names")
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if (!isset($CFG->unicodedb)) {
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$utftmp = get_config('', 'unicodedb');
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if ($utftmp !== false) { //Only if the record exists
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$CFG->unicodedb = $utftmp->value;
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} else {
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$CFG->unicodedb = setup_is_unicodedb();
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set_config('unicodedb', $CFG->unicodedb);
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}
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}
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/// Set the client/server and connection to utf8 if necessary
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/// and configure some other specific variables for each db
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configure_dbconnection();
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/// Now that "set names" has been executed it is safe to
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/// work with the DB, but never before this!
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/// Load up any configuration from the config table
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$CFG = get_config();
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/// Turn on SQL logging if required
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if (!empty($CFG->logsql)) {
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$db->LogSQL();
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}
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/// Set error reporting back to normal
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if (!isset($CFG->debug)) { // empty() would override 0 or false from config.php
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$CFG->debug = 7;
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}
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error_reporting($CFG->debug);
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//// Defining the site
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if ($SITE = get_site()) {
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/**
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* If $SITE global from {@link get_site()} is set then SITEID to $SITE->id, otherwise set to 1.
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*/
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define('SITEID', $SITE->id);
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/// And the 'default' course
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$COURSE = clone($SITE); // For now. This will usually get reset later in require_login() etc.
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} else {
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/**
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* @ignore
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*/
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define('SITEID', 1);
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/// And the 'default' course
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$COURSE = new object; // no site created yet
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$COURSE->id = 1;
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}
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/// Set a default enrolment configuration (see bug 1598)
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if (!isset($CFG->enrol)) {
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$CFG->enrol = 'manual';
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}
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/// Set default enabled enrolment plugins
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if (!isset($CFG->enrol_plugins_enabled)) {
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$CFG->enrol_plugins_enabled = 'manual';
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}
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/// File permissions on created directories in the $CFG->dataroot
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if (empty($CFG->directorypermissions)) {
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$CFG->directorypermissions = 0777; // Must be octal (that's why it's here)
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}
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/// Calculate and set $CFG->ostype to be used everywhere. Possible values are:
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/// - WINDOWS: for any Windows flavour.
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/// - UNIX: for the rest
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/// Also, $CFG->os can continue being used if more specialization is required
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if (stristr(PHP_OS, 'win') && !stristr(PHP_OS, 'darwin')) {
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$CFG->ostype = 'WINDOWS';
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} else {
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$CFG->ostype = 'UNIX';
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}
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$CFG->os = PHP_OS;
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/// Setup cache dir for Smarty and others
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if (!file_exists($CFG->dataroot .'/cache')) {
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make_upload_directory('cache');
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}
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/// Set up smarty template system
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//require_once($CFG->libdir .'/smarty/Smarty.class.php');
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//$smarty = new Smarty;
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//$smarty->template_dir = $CFG->dirroot .'/templates/'. $CFG->template;
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//if (!file_exists($CFG->dataroot .'/cache/smarty')) {
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// make_upload_directory('cache/smarty');
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//}
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//$smarty->compile_dir = $CFG->dataroot .'/cache/smarty';
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/// Set up session handling
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if(empty($CFG->respectsessionsettings)) {
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if (empty($CFG->dbsessions)) { /// File-based sessions
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// Some distros disable GC by setting probability to 0
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// overriding the PHP default of 1
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// (gc_probability is divided by gc_divisor, which defaults to 1000)
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if (ini_get('session.gc_probability') == 0) {
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ini_set('session.gc_probability', 1);
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}
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if (!empty($CFG->sessiontimeout)) {
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ini_set('session.gc_maxlifetime', $CFG->sessiontimeout);
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}
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if (!file_exists($CFG->dataroot .'/sessions')) {
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make_upload_directory('sessions');
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}
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ini_set('session.save_path', $CFG->dataroot .'/sessions');
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} else { /// Database sessions
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ini_set('session.save_handler', 'user');
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$ADODB_SESSION_DRIVER = $CFG->dbtype;
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$ADODB_SESSION_CONNECT = $CFG->dbhost;
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$ADODB_SESSION_USER = $CFG->dbuser;
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$ADODB_SESSION_PWD = $CFG->dbpass;
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$ADODB_SESSION_DB = $CFG->dbname;
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$ADODB_SESSION_TBL = $CFG->prefix.'sessions';
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require_once($CFG->libdir. '/adodb/session/adodb-session.php');
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}
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}
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/// Set sessioncookie variable if it isn't already
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if (!isset($CFG->sessioncookie)) {
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$CFG->sessioncookie = '';
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}
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/// Configure ampersands in URLs
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@ini_set('arg_separator.output', '&');
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/// Location of standard files
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$CFG->wordlist = $CFG->libdir .'/wordlist.txt';
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$CFG->javascript = $CFG->libdir .'/javascript.php';
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$CFG->moddata = 'moddata';
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/// A hack to get around magic_quotes_gpc being turned off
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/// It is strongly recommended to enable "magic_quotes_gpc"!
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if (!ini_get_bool('magic_quotes_gpc') ) {
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function addslashes_deep($value) {
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$value = is_array($value) ?
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array_map('addslashes_deep', $value) :
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addslashes($value);
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return $value;
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}
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$_POST = array_map('addslashes_deep', $_POST);
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$_GET = array_map('addslashes_deep', $_GET);
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$_COOKIE = array_map('addslashes_deep', $_COOKIE);
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$_REQUEST = array_map('addslashes_deep', $_REQUEST);
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if (!empty($_SERVER['REQUEST_URI'])) {
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$_SERVER['REQUEST_URI'] = addslashes($_SERVER['REQUEST_URI']);
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}
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if (!empty($_SERVER['QUERY_STRING'])) {
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$_SERVER['QUERY_STRING'] = addslashes($_SERVER['QUERY_STRING']);
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}
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if (!empty($_SERVER['HTTP_REFERER'])) {
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$_SERVER['HTTP_REFERER'] = addslashes($_SERVER['HTTP_REFERER']);
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}
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if (!empty($_SERVER['PATH_INFO'])) {
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$_SERVER['PATH_INFO'] = addslashes($_SERVER['PATH_INFO']);
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}
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if (!empty($_SERVER['PHP_SELF'])) {
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$_SERVER['PHP_SELF'] = addslashes($_SERVER['PHP_SELF']);
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}
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if (!empty($_SERVER['PATH_TRANSLATED'])) {
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$_SERVER['PATH_TRANSLATED'] = addslashes($_SERVER['PATH_TRANSLATED']);
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}
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}
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/// The following code can emulate "register globals" if required.
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/// This hack is no longer being applied as of Moodle 1.6 unless you really
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/// really want to use it (by defining $CFG->enableglobalshack = true)
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if (!empty($CFG->enableglobalshack)) {
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if (!empty($CFG->detect_unchecked_vars)) {
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global $UNCHECKED_VARS;
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$UNCHECKED_VARS->url = $_SERVER['PHP_SELF'];
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$UNCHECKED_VARS->vars = array();
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}
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if (isset($_GET)) {
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extract($_GET, EXTR_SKIP); // Skip existing variables, ie CFG
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if (!empty($CFG->detect_unchecked_vars)) {
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foreach ($_GET as $key => $val) {
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$UNCHECKED_VARS->vars[$key]=$val;
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}
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}
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}
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if (isset($_POST)) {
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extract($_POST, EXTR_SKIP); // Skip existing variables, ie CFG
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if (!empty($CFG->detect_unchecked_vars)) {
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foreach ($_POST as $key => $val) {
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$UNCHECKED_VARS->vars[$key]=$val;
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}
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}
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}
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if (isset($_SERVER)) {
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extract($_SERVER);
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}
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}
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/// Load up global environment variables
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class object {};
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//discard session ID from POST, GET and globals to tighten security,
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//this session fixation prevention can not be used in cookieless mode
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if (empty($CFG->usesid)) {
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unset(${'MoodleSession'.$CFG->sessioncookie});
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unset($_GET['MoodleSession'.$CFG->sessioncookie]);
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unset($_POST['MoodleSession'.$CFG->sessioncookie]);
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}
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//compatibility hack for Moodle Cron, cookies not deleted, but set to "deleted"
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if (!empty($_COOKIE['MoodleSession'.$CFG->sessioncookie]) && $_COOKIE['MoodleSession'.$CFG->sessioncookie] == "deleted") {
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unset($_COOKIE['MoodleSession'.$CFG->sessioncookie]);
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}
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if (!empty($_COOKIE['MoodleSessionTest'.$CFG->sessioncookie]) && $_COOKIE['MoodleSessionTest'.$CFG->sessioncookie] == "deleted") {
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unset($_COOKIE['MoodleSessionTest'.$CFG->sessioncookie]);
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}
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if (!empty($CFG->usesid) && empty($_COOKIE['MoodleSession'.$CFG->sessioncookie])) {
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require_once("$CFG->dirroot/lib/cookieless.php");
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sid_start_ob();
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}
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if (!isset($nomoodlecookie)) {
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session_name('MoodleSession'.$CFG->sessioncookie);
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@session_start();
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if (! isset($_SESSION['SESSION'])) {
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$_SESSION['SESSION'] = new object;
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$_SESSION['SESSION']->session_test = random_string(10);
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if (!empty($_COOKIE['MoodleSessionTest'.$CFG->sessioncookie])) {
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$_SESSION['SESSION']->has_timed_out = true;
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}
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setcookie('MoodleSessionTest'.$CFG->sessioncookie, $_SESSION['SESSION']->session_test, 0, '/');
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$_COOKIE['MoodleSessionTest'.$CFG->sessioncookie] = $_SESSION['SESSION']->session_test;
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}
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if (! isset($_SESSION['USER'])) {
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$_SESSION['USER'] = new object;
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}
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$SESSION = &$_SESSION['SESSION']; // Makes them easier to reference
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$USER = &$_SESSION['USER'];
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}
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else {
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$SESSION = NULL;
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$USER = NULL;
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}
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if (defined('FULLME')) { // Usually in command-line scripts like admin/cron.php
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$FULLME = FULLME;
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$ME = FULLME;
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} else {
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$FULLME = qualified_me();
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$ME = strip_querystring($FULLME);
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}
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/// In VERY rare cases old PHP server bugs (it has been found on PHP 4.1.2 running
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/// as a CGI under IIS on Windows) may require that you uncomment the following:
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// session_register("USER");
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// session_register("SESSION");
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/// Load up theme variables (colours etc)
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if (!isset($CFG->themedir)) {
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$CFG->themedir = $CFG->dirroot.'/theme/';
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$CFG->themewww = $CFG->wwwroot.'/theme/';
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}
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if (isset($_GET['theme'])) {
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if ($CFG->allowthemechangeonurl || confirm_sesskey()) {
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if (!detect_munged_arguments($_GET['theme'], 0) and file_exists($CFG->themedir. $_GET['theme'])) {
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$SESSION->theme = $_GET['theme'];
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}
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}
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}
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if (!isset($CFG->theme)) {
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$CFG->theme = 'standardwhite';
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|
}
|
|
|
|
theme_setup(); // Sets up theme global variables
|
|
|
|
/// now do a session test to prevent random user switching - observed on some PHP/Apache combinations,
|
|
/// disable checks when working in cookieless mode
|
|
if (empty($CFG->usesid) || !empty($_COOKIE['MoodleSession'.$CFG->sessioncookie])) {
|
|
if ($SESSION != NULL) {
|
|
if (empty($_COOKIE['MoodleSessionTest'.$CFG->sessioncookie])) {
|
|
report_session_error();
|
|
} else if (isset($SESSION->session_test) && $_COOKIE['MoodleSessionTest'.$CFG->sessioncookie] != $SESSION->session_test) {
|
|
report_session_error();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/// Set language/locale of printed times. If user has chosen a language that
|
|
/// that is different from the site language, then use the locale specified
|
|
/// in the language file. Otherwise, if the admin hasn't specified a locale
|
|
/// then use the one from the default language. Otherwise (and this is the
|
|
/// majority of cases), use the stored locale specified by admin.
|
|
|
|
if ($lang = optional_param('lang', PARAM_SAFEDIR)) {
|
|
if (!detect_munged_arguments($lang, 0) and (file_exists($CFG->dataroot .'/lang/'. $lang) or
|
|
file_exists($CFG->dirroot .'/lang/'. $lang))) {
|
|
$SESSION->lang = $lang;
|
|
}
|
|
}
|
|
if (empty($CFG->lang)) {
|
|
$CFG->lang = !empty($CFG->unicodedb) ? 'en_utf8' : 'en';
|
|
}
|
|
|
|
// set default locale - might be changed again later in require_login()
|
|
moodle_setlocale();
|
|
|
|
if (!empty($CFG->opentogoogle)) {
|
|
if (empty($_SESSION['USER'])) { // Ignore anyone logged in
|
|
if (!empty($_SERVER['HTTP_USER_AGENT'])) {
|
|
if (strpos($_SERVER['HTTP_USER_AGENT'], 'Googlebot') !== false ) {
|
|
$USER = guest_user();
|
|
} else if (strpos($_SERVER['HTTP_USER_AGENT'], 'google.com') !== false ) {
|
|
$USER = guest_user();
|
|
} else if (strpos($_SERVER['HTTP_USER_AGENT'], 'Yahoo! Slurp') !== false ) {
|
|
$USER = guest_user();
|
|
} else if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSNBOT') !== false ) {
|
|
$USER = guest_user();
|
|
}
|
|
}
|
|
if (empty($USER) && !empty($_SERVER['HTTP_REFERER'])) {
|
|
if (strpos($_SERVER['HTTP_REFERER'], 'google') !== false ) {
|
|
$USER = guest_user();
|
|
} else if (strpos($_SERVER['HTTP_REFERER'], 'altavista') !== false ) {
|
|
$USER = guest_user();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($CFG->theme == 'standard' or $CFG->theme == 'standardwhite') { // Temporary measure to help with XHTML validation
|
|
if (isset($_SERVER['HTTP_USER_AGENT']) and empty($_SESSION['USER']->id)) { // Allow W3CValidator in as user called w3cvalidator (or guest)
|
|
if ((strpos($_SERVER['HTTP_USER_AGENT'], 'W3C_Validator') !== false) or
|
|
(strpos($_SERVER['HTTP_USER_AGENT'], 'Cynthia') !== false )) {
|
|
if ($USER = get_complete_user_data("username", "w3cvalidator")) {
|
|
$USER->ignoresesskey = true;
|
|
} else {
|
|
$USER = guest_user();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Apache log intergration. In apache conf file one can use ${MOODULEUSER}n in
|
|
/// LogFormat to get the current logged in username in moodle.
|
|
if ($USER && function_exists('apache_note') && !empty($CFG->apacheloguser)) {
|
|
$apachelog_username = clean_filename($USER->username);
|
|
$apachelog_name = clean_filename($USER->firstname. " ".$USER->lastname);
|
|
$apachelog_userid = $USER->id;
|
|
if (isset($USER->realuser)) {
|
|
if ($realuser = get_record('user', 'id', $USER->realuser)) {
|
|
$apachelog_username = clean_filename($realuser->username." as ".$apachelog_username);
|
|
$apachelog_name = clean_filename($realuser->firstname." ".$realuser->lastname ." as ".$apachelog_name);
|
|
$apachelog_userid = clean_filename($realuser->id." as ".$apachelog_userid);
|
|
}
|
|
}
|
|
switch ($CFG->apacheloguser) {
|
|
case 3:
|
|
$logname = $apachelog_username;
|
|
break;
|
|
case 2:
|
|
$logname = $apachelog_name;
|
|
break;
|
|
case 1:
|
|
default:
|
|
$logname = $apachelog_userid;
|
|
break;
|
|
}
|
|
apache_note('MOODLEUSER', $logname);
|
|
}
|
|
|
|
/// Adjust ALLOWED_TAGS
|
|
adjust_allowed_tags();
|
|
|
|
|
|
/// Use a custom script replacement if one exists
|
|
if (!empty($CFG->customscripts)) {
|
|
if (($customscript = custom_script_path()) !== false) {
|
|
require ($customscript);
|
|
}
|
|
}
|
|
|
|
|
|
?>
|