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<?php
/**
 *
 * @package    mahara
Nigel McNie's avatar
Nigel McNie committed
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 * @subpackage auth
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 * @author     Catalyst IT Ltd
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL version 3 or later
 * @copyright  For copyright information on Mahara, please see the README file distributed with this software.
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 *
 */

defined('INTERNAL') || die();

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require(get_config('docroot') . 'auth/user.php');
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require_once(get_config('docroot') . '/lib/htmloutput.php');
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/**
 * Unknown user exception
 */
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class AuthUnknownUserException extends UserException {}
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/**
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 * An instance of an auth plugin failed during execution
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 * e.g. LDAP auth failed to connect to a directory
 * Developers can use this to fail an individual auth
 * instance, but not kill all from being tried.
 * If appropriate - the 'message' of the exception will be used
 * as the display message, so don't forget to language translate it
 */
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class AuthInstanceException extends UserException {

    public function strings() {
        return array_merge(parent::strings(),
                           array('title' => $this->get_sitename() . ': Authentication problem'));
    }
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    public function render_exception() {
        return $this->get_string('message') . "\n\n" . preg_replace('/<br\s?\/?>/ius', "\n", $this->getMessage());
    }
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}
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/**
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 * We tried to call a method on an auth plugin that hasn't been init'ed
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 * successfully
 */
class UninitialisedAuthException extends SystemException {}

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/**
 * We tried creating automatically creating an account for a user but
 * it failed for a reason that the user might want to know about
 * (e.g. they used an email address that's already used on the site)
 */
class AccountAutoCreationException extends AuthInstanceException {

    public function strings() {
        return array_merge(parent::strings(),
                           array('message' => 'The automatic creation of your user account failed.'
                                 . "\nDetails if any, follow:"));
    }
}

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/**
 * Base authentication class. Provides a common interface with which
 * authentication can be carried out for system users.
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 *
 * @todo for authentication:
 *   - inactivity: each institution has inactivity timeout times, this needs
 *     to be supported
 *     - this means the lastlogin field needs to be updated on the usr table
 *     - warnings are handled by cron
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 */
abstract class Auth {

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    protected $instanceid;
    protected $institution;
    protected $instancename;
    protected $priority;
    protected $authname;
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    protected $active;
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    protected $config;
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    protected $has_instance_config;
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    protected $type;
    protected $ready;

    /**
     * Given an id, create the auth object and retrieve the config settings
     * If an instance ID is provided, get all the *instance* config settings
     *
     * @param  int  $id   The unique ID of the auth instance
     * @return bool       Whether the create was successful
     */
    public function __construct($id = null) {
        $this->ready = false;
    }

    /**
     * Instantiate the plugin by pulling the config data for an instance from
     * the database
     *
     * @param  int  $id   The unique ID of the auth instance
     * @return bool       Whether the create was successful
     */
    public function init($id) {
        if (!is_numeric($id) || intval($id) != $id) {
            throw new UserNotFoundException();
        }

        $instance = get_record('auth_instance', 'id', $id);
        if (empty($instance)) {
            throw new UserNotFoundException();
        }

        $this->instanceid   = $id;
        $this->institution  = $instance->institution;
        $this->instancename = $instance->instancename;
        $this->priority     = $instance->priority;
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        $this->active       = (isset($instance->active) ? $instance->active : 1); // We need to check if column exists yet via upgrade and set a default if not
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        $this->authname     = $instance->authname;

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        // Return now if the plugin type doesn't require any config
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        // (e.g. internal)
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        if ($this->has_instance_config == false) {
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            return true;
        }

        $records = get_records_array('auth_instance_config', 'instance', $this->instanceid);

        if ($records == false) {
            return false;
        }

        foreach($records as $record) {
            $this->config[$record->field] = $record->value;
        }

        return true;
    }

    /**
     * The __get overloader is invoked when the requested member is private or
     * protected, or just doesn't exist.
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     *
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     * @param  string  $name   The name of the value to fetch
     * @return mixed           The value
     */
    public function __get($name) {
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        $approved_members = array('instanceid', 'institution', 'instancename', 'priority', 'authname', 'type');
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        if (in_array($name, $approved_members)) {
            return $this->{$name};
        }
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        if (isset($this->config[$name])) {
            return $this->config[$name];
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        }
        return null;
    }

    /**
     * The __set overloader is invoked when the specified member is private or
     * protected, or just doesn't exist.
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     *
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     * @param  string  $name   The name of the value to set
     * @param  mixed   $value  The value to assign
     * @return void
     */
    public function __set($name, $value) {
        /*
        if (property_exists($this, $name)) {
            $this->{$name} = $value;
            return;
        }
        */
        throw new SystemException('It\'s forbidden to set values on Auth objects');
    }

    /**
     * Check that the plugin has been initialised before we try to use it.
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     *
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     * @throws UninitialisedAuthException
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     * @return bool
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     */
    protected function must_be_ready() {
        if ($this->ready == false) {
            throw new UninitialisedAuthException('This Auth plugin has not been initialised');
        }
        return true;
    }

    /**
     * Fetch the URL that users can visit to change their passwords. This might
     * be a Moodle installation, for example.
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     *
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     * @return  mixed   URL to change password or false if there is none
     */
    public function changepasswordurl() {
        $this->must_be_ready();
        if (empty($this->config['changepasswordurl'])) {
            return false;
        }
        return $this->config['changepasswordurl'];
    }

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    /**
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     * Given a username and password, attempts to log the user in.
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     *
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     * @param object $user      An object with username member (at least)
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     * @param string $password  The password to use for the attempt
     * @return bool             Whether the authentication was successful
     * @throws AuthUnknownUserException  If the user is unknown to the
     *                                   authentication method
     */
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    public function authenticate_user_account($user, $password) {
        $this->must_be_ready();
        return false;
    }
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    /**
     * Given a username, returns whether the user exists in the usr table
     *
     * @param string $username The username to attempt to identify
     * @return bool            Whether the username exists
     */
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    public function user_exists($username) {
        $this->must_be_ready();
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        if (record_exists_select('usr', 'LOWER(username) = ?', array(strtolower($username)))) {
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            return true;
        }
        throw new AuthUnknownUserException("\"$username\" is not known to Auth");
    }
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    /**
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     * Returns whether the authentication instance can automatically create a
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     * user record.
     *
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     * Auto creating users means that the authentication plugin can say that
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     * users who don't exist yet in Mahara's usr table are allowed, and Mahara
     * should create a user account for them. Example: the first time a user logs
     * in, when authenticating against an ldap store or similar).
     *
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     * However, if a plugin says a user can be authenticated, then it must
     * implement the get_user_info() method which will be called to find out
     * information about the user so a record in the usr table _can_ be created
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     * for the new user.
     *
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     * Authentication methods must implement this method. Some may choose to
     * implement it by returning an instance config value that the admin user
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     * can set.
     *
     * @return bool
     */
    public abstract function can_auto_create_users();

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    /**
     * If this plugin allows new user's to self-register, this function will be
     * called to check whether it is okay to display a captcha method on the new
     * user self-registration form.
     */
    public static function can_use_registration_captcha() {
        return true;
    }

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    /**
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     * Given a username, returns a hash of information about a user from the
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     * external data source.
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     *
     * @param string $username The username to look up information for
     * @return array           The information for the user
     * @throws AuthUnknownUserException If the user is unknown to the
     *                                  authentication method
     */
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    public function get_user_info($username) {
        return false;
    }
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    /**
     * Given a password, returns whether it is in a valid format for this
     * authentication method.
     *
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     * This only needs to be defined by subclasses if:
     *  - They implement the change_password method, which means that the
     *    system can use the <kbd>passwordchange</kbd> flag on the <kbd>usr</kbd>
     *    table to control whether the user's password needs changing.
     *  - The password that a user can set must be in a certain format.
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     *
     * The default behaviour is to assume that the password is in a valid form,
     * so make sure to implement this method if this is not the case!
     *
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     * This method is defined to be empty, so that authentication methods do
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     * not have to specify a format if they do not need to.
     *
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     * @param string $password The password to check
     * @return bool            Whether the username is in valid form.
     */
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    public function is_password_valid($password) {
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        return true;
    }

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    /**
     * Called when a user is being logged in, after the main authentication routines.
     *
     * You can use $USER->login() to perform any additional tasks, for example
     * to set a cookie that another application can read, or pull some data
     * from somewhere.
     *
     * This method has no parameters and needs no return value
     */
    public function login() {
    }

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    /**
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     * Called when a user is being logged out, either by clicking a logout
     * link, their session timing out or some other method where their session
     * is explicitly being ended with no more processing to take place on this
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     * page load.
     *
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     * You can use $USER->logout() to log a user out but continue page
     * processing if necessary. register.php is an example of such a place
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     * where this happens.
     *
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     * If you define this hook, you can call $USER->logout() in it if you need
     * to before redirecting. Otherwise, it will be called for you once your
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     * hook has run.
     *
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     * If you do not explicitly redirect yourself, once this hook is finished
     * the user will be redirected to the homepage with a message saying they
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     * have been logged out successfully.
     *
     * This method has no parameters and needs no return value
     */
    public function logout() {
    }

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    /**
     * Indicates whether this auth instance is parent to another auth instance
     * @return boolean (For backwards-compatibility reasons, it actually returns $this or null)
     */
    public function is_parent_authority() {
        if (count_records('auth_instance_config', 'field', 'parent', 'value', $this->instanceid)) {
            return $this;
        }
        else {
            return null;
        }
    }

    /**
     * Returns the ID of this instance's parent authority; or FALSE if it has no parent authority
     * @return int|false
     */
    public function get_parent_authority() {
        return get_field('auth_instance_config', 'value', 'instance', $this->id, 'field', 'parent');
    }


    /**
     * Indicates whether or not this auth instance uses the remote username. Most auth instances
     * will only use it if they are the parent to another auth instance.
     */
    public function needs_remote_username() {
        return (boolean) $this->is_parent_authority();
    }
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}


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/******************************************************************************/
    // End of Auth base-class
/******************************************************************************/
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/*
* Checks all the available auth types and executes 'install_auth_default' method
* if they have one
*/
function install_auth_default() {
    $plugins = auth_get_available_auth_types();

    foreach ($plugins as $key => $value) {
        $classname = 'PluginAuth' . ucfirst(strtolower($value->name));
        $methodname = 'install_auth_default';
        if (method_exists($classname, $methodname)) {
            call_static_method($classname, $methodname);
        }
    }
}
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/**
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 * Handles authentication by setting up a session for a user if they are logged
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 * in.
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 *
 * This function combined with the Session class is smart - if the user is not
 * logged in then they do not get a session, which prevents simple curl hits
 * or search engine crawls to a page from getting sessions they won't use.
 *
 * Once the user has a session, they keep it even if the log out, so it can
 * be reused. The session does expire, but the expiry time is typically a week
 * or more.
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 *
 * If the user is not authenticated for this page, then this function will
 * exit, printing the login page. Therefore, after including init.php, you can
 * be sure that the user is logged in, or has a valid guest key. However, no
 * testing is done to make sure the user has the required permissions to see
 * the page.
 *
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 */
function auth_setup () {
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    global $SESSION, $USER;
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    // If the system is not installed, let the user through in the hope that
    // they can fix this little problem :)
    if (!get_config('installed')) {
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        $USER->logout();
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        return;
    }

    // Check the time that the session is set to log out. If the user does
    // not have a session, this time will be 0.
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    $sessionlogouttime = $USER->get('logout_time');
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    // Need to doublecheck that the User's sessionid still has a match the usr_session table
    // It can disappear if the current user has hacked the real user's account and the real user has
    // reset the password clearing the session from usr_session.
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    $sessionexists = ($USER->id > 0) ? get_record('usr_session', 'usr', $USER->id, 'session', $USER->get('sessionid')) : false;
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    $parentuser = $USER->get('parentuser');
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    if (($sessionlogouttime && param_exists('logout'))
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       || ($sessionexists === false && $USER->get('sessionid') != '' && empty($parentuser))
       || ($sessionexists && isset($sessionexists->useragent) && $sessionexists->useragent != $_SERVER['HTTP_USER_AGENT'])) {
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        // Call the authinstance' logout hook
        $authinstance = $SESSION->get('authinstance');
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        if ($authinstance) {
            $authobj = AuthFactory::create($authinstance);
            $authobj->logout();
        }
        else {
            log_debug("Strange: user " . $USER->get('username') . " had no authinstance set in their session");
        }
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        if (function_exists('local_logout')) {
            local_logout();
        }

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        $USER->logout();
        $SESSION->add_ok_msg(get_string('loggedoutok'));
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        redirect();
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    }
    if ($sessionlogouttime > time()) {
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        // The session is still active, so continue it.
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        // Make sure that if a user's admin status has changed, they're kicked
        // out of the admin section
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        if (in_admin_section()) {
            // Reload site admin/staff permissions
            $realuser = get_record('usr', 'id', $USER->id, null, null, null, null, 'admin,staff');
            if (!$USER->get('admin') && $realuser->admin) {
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                // The user has been made into an admin
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                $USER->admin = 1;
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            }
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            else if ($USER->get('admin') && !$realuser->admin) {
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                // The user's admin rights have been taken away
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                $USER->admin = 0;
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            }
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            if (!$USER->get('staff') && $realuser->staff) {
                $USER->staff = 1;
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            }
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            else if ($USER->get('staff') && !$realuser->staff) {
                $USER->staff = 0;
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            }
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            // Reload institutional admin/staff permissions
            $USER->reset_institutions();
            auth_check_admin_section();
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        }
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        $USER->renew();
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        auth_check_required_fields();
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    }
    else if ($sessionlogouttime > 0) {
        // The session timed out
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        $authinstance = $SESSION->get('authinstance');
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        if ($authinstance) {
            $authobj = AuthFactory::create($authinstance);

            $mnetuser = 0;
            if ($SESSION->get('mnetuser') && $authobj->parent) {
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                // We wish to remember that the user is an MNET user - even though
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                // they're using the local login form
                $mnetuser = $USER->get('id');
            }
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            $authobj->logout();
            $USER->logout();
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            if ($mnetuser != 0) {
                $SESSION->set('mnetuser', $mnetuser);
                $SESSION->set('authinstance', $authinstance);
            }
        }
        else {
            log_debug("Strange: user " . $USER->get('username') . " had no authinstance set in their session");
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        }

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        if (defined('JSON')) {
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            json_reply('global', get_string('sessiontimedoutreload'), 1);
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        }

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        // If the page the user is viewing is public, inform them that they can
        // log in again
        if (defined('PUBLIC')) {
            // @todo this links to ?login - later it should do magic to make
            // sure that whatever GET string is made it includes the old data
            // correctly
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            $loginurl = $_SERVER['REQUEST_URI'];
            $loginurl .= (false === strpos($loginurl, '?')) ? '?' : '&';
            $loginurl .= 'login';
            $SESSION->add_info_msg(get_string('sessiontimedoutpublic', 'mahara', hsc($loginurl)), false);
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            return;
        }

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        auth_draw_login_page(get_string('sessiontimedout'));
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    }
    else {
        // There is no session, so we check to see if one needs to be started.
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        // Build login form. If the form is submitted it will be handled here,
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        // and set $USER for us (this will happen when users hit a page and
        // specify login data immediately
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        $form = pieform_instance(auth_get_login_form());
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        if ($USER->is_logged_in()) {
            return;
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        }
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        // Check if the page is public or the site is configured to be public.
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        if (defined('PUBLIC') && !param_exists('login')) {
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            return;
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        }
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        // No session and a json request
        if (defined('JSON')) {
            json_reply('global', get_string('nosessionreload'), 1);
        }
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        auth_draw_login_page(null, $form);
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        exit;
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    }
}

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/**
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 *
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 * Returns all auth instances
 *
 * @return array                     Array of auth instance records
 */
function auth_get_auth_instances() {
    static $cache = array();

    if (count($cache) > 0) {
        return $cache;
    }

    $sql ='
        SELECT DISTINCT
            i.id,
            inst.name,
            inst.displayname,
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            i.instancename,
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            i.authname,
            i.active
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        FROM
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            {institution} inst,
            {auth_instance} i
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        WHERE
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            i.institution = inst.name
        ORDER BY
            inst.displayname,
            i.instancename';

    $cache = get_records_sql_array($sql, array());

    if (empty($cache)) {
        return array();
    }

    return $cache;
}


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/**
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 *
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 * Given a list of institutions, returns all auth instances associated with them
 *
 * @return array                     Array of auth instance records
 */
function auth_get_auth_instances_for_institutions($institutions) {
    if (empty($institutions)) {
        return array();
    }
    $sql ='
        SELECT DISTINCT
            i.id,
            inst.name,
            inst.displayname,
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            i.instancename,
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            i.authname,
            i.active
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        FROM
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            {institution} inst,
            {auth_instance} i
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        WHERE
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            i.institution = inst.name AND
            inst.name IN (' . join(',', array_map('db_quote',$institutions)) . ')
        ORDER BY
            inst.displayname,
            i.instancename';

    return get_records_sql_array($sql, array());
}
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/**
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 * Given an institution, returns the authentication methods used by it, sorted
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 * by priority.
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 *
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 * @param  string   $institution     Name of the institution
 * @return array                     Array of auth instance records
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 */
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function auth_get_auth_instances_for_institution($institution=null) {
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    static $cache = array();
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    if (null == $institution) {
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        return array();
    }

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    if (!isset($cache[$institution])) {
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        // Get auth instances in order of priority
        // DO NOT CHANGE THE SORT ORDER OF THIS RESULT SET
        // YEAH EINSTEIN - THAT MEANS YOU!!!

        // TODO: work out why this won't accept a placeholder - had to use db_quote
        $sql ='
            SELECT DISTINCT
                i.id,
                i.instancename,
                i.priority,
                i.authname,
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                i.active,
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                a.requires_config,
                a.requires_parent
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            FROM
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                {auth_instance} i,
                {auth_installed} a
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            WHERE
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                a.name = i.authname AND
                i.institution = '. db_quote($institution).'
            ORDER BY
                i.priority,
                i.instancename';

        $cache[$institution] = get_records_sql_array($sql, array());

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        if (empty($cache[$institution])) {
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            return false;
        }
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    }
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    return $cache[$institution];
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}

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/**
 * Given a wwwroot, find any auth instances that can come from that host
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 *
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 * @param   string  wwwroot of the host that is connecting to us
 * @return  array   array of record objects
 */
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function auth_get_auth_instances_for_wwwroot($wwwroot) {
    $query = "  SELECT
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                    ai.id,
                    ai.authname,
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                    ai.active,
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                    i.id as institutionid,
                    i.displayname,
                    i.suspended
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                FROM
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                    {auth_instance} ai
                    INNER JOIN {institution} i
                        ON ai.institution = i.name
                    INNER JOIN {auth_instance_config} aic
                        ON aic.field = 'wwwroot'
                        AND aic.instance = ai.id
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                WHERE
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                    aic.value = ?";
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    return get_records_sql_array($query, array('value' => $wwwroot));
}

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/**
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 * Given an institution, get all the auth types EXCEPT those that are already
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 * enabled AND do not require configuration.
 *
 * @param  string   $institution     Name of the institution
 * @return array                     Array of auth instance records
 */
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function auth_get_available_auth_types($institution=null) {
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    if (!is_null($institution) && (!is_string($institution) || strlen($institution) > 255)) {
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        return array();
    }

    // TODO: work out why this won't accept a placeholder - had to use db_quote
    $sql ='
        SELECT DISTINCT
            a.name,
            a.requires_config
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        FROM
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            {auth_installed} a
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        LEFT JOIN
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            {auth_instance} i
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        ON
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            a.name = i.authname AND
            i.institution = '. db_quote($institution).'
        WHERE
           (a.requires_config = 1 OR
            i.id IS NULL) AND
            a.active = 1
        ORDER BY
719
            a.name';
720

721 722 723 724 725
    if (is_null($institution)) {
        $result = get_records_array('auth_installed', '','','name','name, requires_config');
    } else {
        $result = get_records_sql_array($sql, array());
    }
726 727 728 729 730

    if (empty($result)) {
        return array();
    }

731 732 733 734 735 736 737 738 739 740
    foreach ($result as &$row) {
        $row->title       = get_string('title', 'auth.' . $row->name);
        safe_require('auth', $row->name);
        if ($row->is_usable = call_static_method('PluginAuth' . $row->name, 'is_usable')) {
            $row->description = get_string('description', 'auth.' . $row->name);
        }
        else {
            $row->description = get_string('notusable', 'auth.' . $row->name);
        }
    }
741
    usort($result, create_function('$a, $b', 'if ($a->is_usable != $b->is_usable) return $b->is_usable; return strnatcasecmp($a->title, $b->title);'));
742

743 744
    return $result;
}
745 746
/**
 * Checks that all the required fields are set, and handles setting them if required.
747 748 749
 *
 * Checks whether the current user needs to change their password, and handles
 * the password changing if it's required.
750 751
 */
function auth_check_required_fields() {
752
    global $USER, $SESSION;
753
    $refused = param_boolean('refuseprivacy', false);
754
    // Privacy statement.
755 756 757 758
    if (get_config('institutionstrictprivacy') && !$USER->has_latest_agreement()) {

        if ($refused) {
            $elements['refused'] = array(
759
                'type' => 'hidden',
760
                'value' => 1
761
            );
762 763 764 765 766
            $elements['submit'] = array(
                'type' => 'submitcancel',
                'class' => 'btn-default',
                'value' => array(get_string('yes'), get_string('no')),
                'goto' => get_config('wwwroot'),
767
            );
768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
            $form = pieform(array(
                'name'       => 'refuseprivacy',
                'elements' => $elements,
            ));
        }
        else {
            // Get all institutions of a user.
            $userinstitutions = array_keys($USER->get('institutions'));
            // Include the 'mahara' institution so that we may show the site privacy statement as well.
            array_push($userinstitutions, 'mahara');

            // Check if there are new privacies that need to be accepted.
            $latestversions = get_latest_privacy_versions($userinstitutions, true);

            foreach ($latestversions as $privacy) {
                $elements[$privacy->institution . 'text'] = array(
                    'type' => 'markup',
                    'value' => '<h2>' . ($privacy->institution == 'mahara' ? get_string('siteprivacystatement', 'admin') : get_string('institutionprivacystatement', 'admin')) . '</h2>' . $privacy->content,
                );
                $elements[$privacy->institution . 'id'] = array(
                    'type' => 'hidden',
                    'value' => $privacy->id,
                );
                $elements[$privacy->institution] = array(
                    'type'         => 'switchbox',
                    'title'        => get_string('privacyagreement', 'admin'),
                    'description'  => $privacy->agreed ? get_string('privacyagreedto', 'admin', format_date(strtotime($privacy->agreedtime))) : '',
                    'defaultvalue' => $privacy->agreed ? true : false,
                    'disabled'     => $privacy->agreed ? true : false,
                    'required' => true,
                );
                $elements[$privacy->institution . 'switch'] = array(
                    'type' => 'hidden',
                    'value' => $privacy->agreed ? 'disabled' : 'enabled',
                );
            }
            $elements['submit'] = array(
                'class' => 'btn-primary',
                'type'  => 'submit',
                'value' => get_string('savechanges', 'admin')
808
            );
809 810 811 812
            $form = pieform(array(
                'name'       => 'agreetoprivacy',
                'elements' => $elements,
            ));
813 814 815 816 817
        }
        define('TITLE', get_string('privacy', 'admin'));
        $smarty = smarty();
        setpageicon($smarty, 'icon-umbrella');
        $smarty->assign('form', $form);
818
        $smarty->assign('refused', $refused);
819 820 821 822
        $smarty->display('account/useracceptprivacy.tpl');
        exit;
    }

823
    if (defined('NOCHECKREQUIREDFIELDS') || $SESSION->get('nocheckrequiredfields') === true) {
824 825
        return;
    }
826 827 828 829 830 831 832 833 834 835
    $changepassword = true;
    $elements = array();

    if (
        !$USER->get('passwordchange')                                // User doesn't need to change their password
        || ($USER->get('parentuser') && $USER->get('loginanyway'))   // User is masquerading and wants to log in anyway
        || defined('NOCHECKPASSWORDCHANGE')                          // The page wants to skip this hassle
        ) {
        $changepassword = false;
    }
836

837
    // Check if the user wants to log in anyway
838
    if ($USER->get('passwordchange') && $USER->get('parentuser') && param_exists('loginanyway')) {
839 840 841 842
        $USER->loginanyway = true;
        $changepassword = false;
    }

843 844 845 846 847
    // Do not force password change on JSON request.
    if (defined('JSON') && JSON == true) {
        $changepassword = false;
    }

848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896
    if ($changepassword) {
        $authobj = AuthFactory::create($USER->authinstance);

        if ($authobj->changepasswordurl) {
            redirect($authobj->changepasswordurl);
            exit;
        }

        if (method_exists($authobj, 'change_password')) {

            if ($SESSION->get('resetusername')) {
                $elements['username'] = array(
                    'type' => 'text',
                    'defaultvalue' => $USER->get('username'),
                    'title' => get_string('changeusername', 'account'),
                    'description' => get_string('changeusernamedesc', 'account', hsc(get_config('sitename'))),
                );
            }

            $elements['password1'] = array(
                'type'        => 'password',
                'title'       => get_string('newpassword') . ':',
                'description' => get_string('yournewpassword'),
                'rules'       => array(
                    'required' => true
                )
            );

            $elements['password2'] = array(
                'type'        => 'password',
                'title'       => get_string('confirmpassword') . ':',
                'description' => get_string('yournewpasswordagain'),
                'rules'       => array(
                    'required' => true,
                ),
            );

            $elements['email'] = array(
                'type'   => 'text',
                'title'  => get_string('principalemailaddress', 'artefact.internal'),
                'ignore' => (trim($USER->get('email')) != '' && !preg_match('/@example\.org$/', $USER->get('email'))),
                'rules'  => array(
                    'required' => true,
                    'email'    => true,
                ),
            );
        }
    }
    else if (defined('JSON')) {
897 898 899 900
        // Don't need to check this for json requests
        return;
    }

901 902
    safe_require('artefact', 'internal');

903
    $alwaysmandatoryfields = array_keys(ArtefactTypeProfile::get_always_mandatory_fields());
904
    $element_data = ArtefactTypeProfile::get_field_element_data();
905
    foreach(ArtefactTypeProfile::get_mandatory_fields() as $field => $type) {
906 907
        // Always mandatory fields are stored in the usr table, so are part of
        // the user session object. We can save a query by grabbing them from
908 909 910 911 912
        // the session.
        if (in_array($field, $alwaysmandatoryfields) && $USER->get($field) != null) {
            continue;
        }
        // Not cached? Get value the standard way.
913
        if (get_profile_field($USER->get('id'), $field) != null) {
914 915
            continue;
        }
916 917 918 919 920 921 922 923
        // If profile field saves it's data somewhere different to normal
        $classname = 'ArtefactType' . ucfirst($field);
        if (is_callable(array($classname, 'defaultoption'))) {
            $option = call_static_method($classname, 'defaultoption');
            if (!empty($option)) {
                continue;
            }
        }
924

925
        if ($field == 'email') {
926 927 928 929
            if (isset($elements['email'])) {
                continue;
            }
            // Use a text field for their first e-mail address, not the
930 931 932 933
            // emaillist element
            $type = 'text';
        }

934 935 936 937 938
        $elements[$field] = array(
            'type'  => $type,
            'title' => get_string($field, 'artefact.internal'),
            'rules' => array('required' => true)
        );
939 940 941 942 943
        // We need to merge the rules for the element if they have special rules defined
        // in get_field_element_data() so that we save correct data.
        if (isset($element_data[$field])) {
            $elements[$field] = array_merge_recursive($elements[$field], $element_data[$field]);
        }
944

945 946 947 948 949 950 951 952 953
        if ($field == 'socialprofile') {
            $elements[$field] = ArtefactTypeSocialprofile::get_new_profile_elements();
            // add an element to flag that socialprofile is in the list of fields.
            $elements['socialprofile_hidden'] = array(
                'type'  => 'hidden',
                'value' => 1,
            );
        }

954 955 956 957 958 959 960 961 962 963 964
        // @todo ruthlessly stolen from artefact/internal/index.php, could be merged
        if ($type == 'wysiwyg') {
            $elements[$field]['rows'] = 10;
            $elements[$field]['cols'] = 60;
        }
        if ($type == 'textarea') {
            $elements[$field]['rows'] = 4;
            $elements[$field]['cols'] = 60;
        }
        if ($field == 'country') {
            $elements[$field]['options'] = getoptions_country();
965
            $elements[$field]['defaultvalue'] = get_config('country') ? get_config('country') : 'nz';
966
        }
967 968 969 970 971 972 973 974
        if (is_callable(array($classname, 'getoptions'))) {
            $options = call_static_method($classname, 'getoptions');
            $elements[$field]['options'] = $options;
        }
        if (is_callable(array($classname, 'defaultoption'))) {
            $defaultoption = call_static_method($classname, 'defaultoption');
            $elements[$field]['defaultvalue'] = $defaultoption;
        }
975 976

        if ($field == 'email') {
977 978 979 980 981 982 983 984 985 986 987
            // Check if a validation email has been sent
            if (record_exists('artefact_internal_profile_email', 'owner', $USER->get('id'))) {
                $elements['email']['type'] = 'html';
                $elements['email']['value'] = get_string('validationprimaryemailsent', 'auth');
                $elements['email']['disabled'] = true;
                $elements['email']['rules'] = array('required' => false);
            }
            else {
                $elements[$field]['rules']['email'] = true;
                $elements[$field]['description'] = get_string('primaryemaildescription', 'auth');
            }
988
        }
989 990 991
    }

    if (empty($elements)) { // No mandatory fields that aren't set
992
        $SESSION->set('nocheckrequiredfields', true);
993 994 995
        return;
    }

996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
    if ((count($elements) == 1) && isset($elements['email']) && ($elements['email']['type'] == 'html')) {
        // Display a message if there is only 1 required field and this field is email whose validation has been sent
        $elements['submit'] = array(
                'type' => 'submit',
                'value' => get_string('continue', 'admin')
        );
        $form = pieform(array(
                'name'     => 'requiredfields',
                'method'   => 'post',
                'action'   => get_config('wwwroot') . '?logout',
                'elements' => $elements
        ));
    }
    else {
        $elements['submit'] = array(
            'type' => 'submit',
1012
            'class' => 'btn-primary',
1013 1014
            'value' => get_string('submit')
        );
1015

1016 1017 1018 1019
        $form = pieform(array(
            'name'     => 'requiredfields',
            'method'   => 'post',
            'action'   => '',
1020 1021 1022
            'elements' => $elements,
            'dieaftersubmit' => FALSE,
            'backoutaftersubmit' => TRUE,
1023 1024
        ));
    }
1025

1026 1027 1028 1029 1030
    // Has the form been successfully submitted? Back out and let the requested URL continue.
    if ($form === FALSE) {
        return;
    }

1031
    $smarty = smarty();
1032 1033 1034
    if ($USER->get('parentuser')) {
        $smarty->assign('loginasoverridepasswordchange',
            get_string('loginasoverridepasswordchange', 'admin',
1035
                       '<strong><a class="" href="' . get_config('wwwroot') . '?loginanyway">', '</a></strong>'));
1036 1037
    }
    $smarty->assign('changepassword', $changepassword);
1038
    $smarty->assign('changeusername', $SESSION->get('resetusername'));
1039 1040 1041 1042 1043
    $smarty->assign('form', $form);
    $smarty->display('requiredfields.tpl');
    exit;
}

1044
function requiredfields_validate(Pieform $form, $values) {
1045
    global $USER;
1046
    if (isset($values['password1'])) {
1047

1048 1049 1050
        // Get the authentication type for the user, and
        // use the information to validate the password
        $authobj = AuthFactory::create($USER->authinstance);
1051

1052 1053
        // @todo this could be done by a custom form rule... 'password' => $user
        password_validate($form, $values, $USER);
1054

1055 1056 1057 1058 1059 1060
        // The password cannot be the same as the old one
        try {
            if (!$form->get_error('password1')
                && $authobj->authenticate_user_account($USER, $values['password1'])) {
                $form->set_error('password1', get_string('passwordnotchanged'));
            }
1061
        }
1062 1063 1064
        // propagate error up as the collective error AuthUnknownUserException
         catch  (AuthInstanceException $e) {
            $form->set_error('password1', $e->getMessage());
1065
        }
1066 1067 1068 1069 1070

        if ($authobj->authname == 'internal' && isset($values['username']) && $values['username'] != $USER->get('username')) {
            if (!AuthInternal::is_username_valid($values['username'])) {
                $form->set_error('username', get_string('usernameinvalidform', 'auth.internal'));
            }
1071
            if (!$form->get_error('username') && record_exists_select('usr', 'LOWER(username) = ?', array(strtolower($values['username'])))) {
1072 1073
                $form->set_error('username', get_string('usernamealreadytaken', 'auth.internal'));
            }
1074 1075
        }
    }
1076

1077 1078
    // Check if email has been taken
    if (isset($values['email']) && record_exists('artefact_internal_profile_email', 'email', $values['email'])) {
1079
        $form->set_error('email', get_string('unvalidatedemailalreadytaken', 'artefact.internal'));
1080
    }
1081 1082 1083 1084
    // Check if the socialprofile url is valid.
    if (isset($values['socialprofile_hidden']) && $values['socialprofile_hidden'] && $values['socialprofile_profiletype'] == 'webpage' && !filter_var($values['socialprofile_profileurl'], FILTER_VALIDATE_URL)) {
        $form->set_error('socialprofile_profileurl', get_string('notvalidprofileurl', 'artefact.internal'));
    }
1085 1086
}

1087
function requiredfields_submit(Pieform $form, $values) {
1088
    global $USER, $SESSION;
1089

1090 1091 1092 1093 1094 1095 1096 1097 1098
    if (isset($values['password1'])) {
        $authobj = AuthFactory::create($USER->authinstance);

        // This method should exist, because if it did not then the change
        // password form would not have been shown.
        if ($password = $authobj->change_password($USER, $values['password1'])) {
            $SESSION->add_ok_msg(get_string('passwordsaved'));
        }
        else {
1099
            throw new SystemException('Attempt by "' . $USER->get('username') . '@'
1100 1101 1102
                . $USER->get('institution') . 'to change their password failed');
        }
    }
1103

1104 1105 1106 1107 1108 1109 1110 1111 1112
    if (isset($values['username'])) {
        $SESSION->set('resetusername', false);
        if ($values['username'] != $USER->get('username')) {
            $USER->username = $values['username'];
            $USER->commit();
            $otherfield = true;
        }
    }

1113 1114 1115 1116 1117 1118
    if (isset($values['socialprofile_hidden']) && $values['socialprofile_hidden']) {
        // Socialprofile fields. Save them on their own as they are a fieldset.
        set_profile_field($USER->get('id'), 'socialprofile', $values);
        $otherfield = true;
    }

1119
    foreach ($values as $field => $value) {
1120 1121 1122
        if (in_array($field, array('submit', 'sesskey', 'password1', 'password2', 'username',
                                   'socialprofile_service', 'socialprofile_profiletype',
                                   'socialprofile_profileurl', 'socialprofile_hidden'))) {
1123 1124 1125
            continue;
        }
        if ($field == 'email') {
1126
            $email = $values['email'];
1127
            // Need to update the admin email on installation
1128
            if ($USER->get('admin')) {
1129 1130 1131 1132 1133
                $oldemail = get_field('usr', 'email', 'id', $USER->get('id'));
                if ($oldemail == 'admin@example.org') {
                    // we are dealing with the dummy email that is set on install
                    update_record('usr', array('email' => $email), array('id' => $USER->get('id')));
                    update_record('artefact_internal_profile_email', array('email' => $email), array('owner' => $USER->get('id')));
1134
                    update_record('artefact', array('title' => $email), array('owner' => $USER->get('id'), 'artefacttype' => 'email'));
1135 1136
                }
            }
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
            // Check if a validation email has been sent, if not send one
            if (!record_exists('artefact_internal_profile_email', 'owner', $USER->get('id'))) {
                $key = get_random_key();
                $key_url = get_config('wwwroot') . 'artefact/internal/validate.php?email=' . rawurlencode($email) . '&key=' . $key;
                $key_url_decline = $key_url . '&decline=1';

                try {
                    $sitename = get_config('sitename');
                    email_user(
                        (object)array(
                            'id'            => $USER->get('id'),
                            'username'      => $USER->get('username'),
                            'firstname'     => $USER->get('firstname'),
                            'lastname'      => $USER->get('lastname'),
                            'preferredname' => $USER->get('preferredname'),
                            'admin'         => $USER->get('admin'),
                            'staff'         => $USER->get('staff'),
                            'email'         => $email,
                        ),
                        null,
                        get_string('emailvalidation_subject', 'artefact.internal'),
                        get_string('emailvalidation_body1', 'artefact.internal', $USER->get('firstname'), $email, $sitename, $key_url, $sitename, $key_url_decline)
                    );
                }
                catch (EmailException $e) {
                    $SESSION->add_error_msg($email);
                }

                insert_record(
                    'artefact_internal_profile_email',
                    (object) array(
                        'owner'    => $USER->get('id'),
                        'email'    => $email,
                        'verified' => 0,
                        'principal' => 1,
                        'key'      => $key,
                        'expiry'   => db_format_timestamp(time() + 86400),
                    )
                );
                $SESSION->add_ok_msg(get_string('validationemailsent', 'artefact.internal'));
            }
        }
        else {
            set_profile_field($USER->get('id'), $field, $value);
            $otherfield = true;
1182
        }
1183
    }
1184

1185 1186 1187 1188
    if (isset($otherfield)) {
        $SESSION->add_ok_msg(get_string('requiredfieldsset', 'auth'));
    }

1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200
    // Update the title of user's first blog if first and/or last name have been changed
    $updatedfields = array_keys($values);
    if (in_array('firstname', $updatedfields) || in_array('lastname', $updatedfields)) {
        safe_require('artefact', 'blog');
        $userblogs = get_records_select_array('artefact', 'artefacttype = \'blog\' AND owner = ?', array($USER->get('id')));
        if ($userblogs && count($userblogs) == 1) {
            $defaultblog = new ArtefactTypeBlog($userblogs[0]->id);
            $defaultblog->set('title', get_string('defaultblogtitle', 'artefact.blog', display_name($USER, null, true)));
            $defaultblog->commit();
        }
    }

1201
    $SESSION->set('nocheckrequiredfields', true);
1202 1203 1204 1205
    if ($form->get_property('backoutaftersubmit')) {
        return;
    }

1206
    redirect();
1207 1208
}

1209 1210 1211 1212 1213 1214
function agreetoprivacy_submit(Pieform $form, $values) {
    global $USER, $SESSION;

    $userinstitutions = array_keys($USER->get('institutions'));
    array_push($userinstitutions, 'mahara');

1215
    $hasrefused = false;
1216
    foreach ($userinstitutions as $institution) {
1217 1218 1219 1220
        // check if the institution has a privacy statement
        // if not, it depends on the site one and we can skip it
        // if yes, check if the user has already accepted it (switch is disabled)
        if (!isset($values[$institution]) || $values[$institution . 'switch'] == 'disabled') {
1221 1222 1223
            continue;
        }
        try {
1224
            $agreed = (empty($values[$institution]) ? 0 : $values[$institution]);
1225
            save_user_reply_to_agreement($USER->get('id'), $values[$institution . 'id'], $agreed);
1226 1227 1228 1229 1230 1231
            if ($values[$institution]) {
                $SESSION->add_ok_msg(get_string('agreementsaved', 'admin'));
            }
            else {
                $hasrefused = true;
            }
1232 1233 1234 1235 1236
        }
        catch (SQLException $e) {
            $SESSION->add_ok_msg(get_string('savefailed', 'admin'));
        }
    }
1237 1238 1239 1240 1241 1242
    if ($hasrefused) {
        redirect(get_config('wwwroot') . '?refuseprivacy=true');
    }
    $SESSION->set('nocheckrequiredfields', true);
    redirect();
}
1243

1244 1245 1246 1247 1248
function refuseprivacy_submit(Pieform $form, $values) {
    global $USER, $SESSION;

    suspend_user($USER->get('id'), 'privacyrefusal');
    $SESSION->add_ok_msg(get_string('usersuspended', 'admin'));
1249
    $SESSION->set('nocheckrequiredfields', true);
1250 1251

    $USER->logout();
1252 1253
    redirect();
}
1254
/**
1255
 * Creates and displays the transient login page.
1256
 *
1257 1258 1259 1260
 * This login page remembers all GET/POST data and passes it on. This way,
 * users can have their sessions time out, and then can log in again without
 * losing any of their data.
 *
1261 1262 1263
 * As this function builds and validates a login form, it is possible that
 * calling this may validate a user to be logged in.
 *
1264 1265 1266
 * @param Pieform $form If specified, just build this form to get the HTML
 *                      required. Otherwise, this function will build and
 *                      validate the form itself.
1267
 * @access private
1268
 */
1269
function auth_draw_login_page($message=null, Pieform $form=null) {
1270
    global $USER, $SESSION;
1271
    if ($form != null) {
1272
        $loginform = get_login_form_js($form->build());
1273 1274
    }
    else {
1275
        $loginform = get_login_form_js(pieform(auth_get_login_form()));
1276 1277 1278 1279 1280
        /*
         * If $USER is set, the form was submitted even before being built.
         * This happens when a user's session times out and they resend post
         * data. The request should just continue if so.
         */
1281
        if ($USER->is_logged_in()) {
1282 1283 1284 1285 1286
            return;
        }

    }

1287 1288 1289 1290 1291 1292 1293
    $externallogin = get_config('externallogin');
    if ($externallogin) {
        $externallogin = preg_replace('/{shorturlencoded}/', urlencode(get_relative_script_path()), $externallogin);
        $externallogin = preg_replace('/{wwwroot}/', get_config('wwwroot'), $externallogin);
        redirect($externallogin);
    }

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    if ($message) {
        $SESSION->add_info_msg($message);
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    }
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    define('TITLE', get_string('loginto', 'mahara', get_config('sitename')));
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    $smarty = smarty(array(), array(), array(), array('pagehelp' => false, 'sidebars' => false));
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    $smarty->assign('login_form', $loginform);
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    $smarty->assign('LOGINPAGE', true);
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    $smarty->display('login.tpl');
    exit;
}
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/**
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 * Returns the definition of the login form, for display on the transient login page.
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 *
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 * @return array   The login form definition array.
 * @access private
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 */
function auth_get_login_form() {
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    $elements = auth_get_login_form_elements();
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    $elements['login']['elements']['login_submitted'] = array(
        'type'  => 'hidden',
        'value' => 1
    );
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    // Change login redirection for clean urls
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    $url = get_relative_script_path();
    $getstart = strrpos($url, '?');
    if ($getstart !== false) {
        $getpart = substr($url, $getstart + 1);
        $url = substr($url, 0, $getstart);
    }
    if (!file_exists(get_config('docroot') . $url)) {
        // clean url, treat get string differently
        $get = array();
        if (isset($getpart)) {
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            $getarr = explode('&', $getpart);
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            if ($getarr) {
                foreach ($getarr as $data) {
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                    $arr = explode('=', $data);
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                    $get[$arr[0]] = isset($arr[1]) ? $arr[1] : null;
                }
            }
        }
    }
    else {
        $get = $_GET;
    }
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    // The login page is completely transient, and it is smart because it
    // remembers the GET and POST data sent to it and resends that on
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    // afterwards.
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    $action = '';
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    if ($get) {
        if (isset($get['logout'])) {
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            // You can log the user out on any particular page by appending
            // ?logout to the URL. In this case, we don't want the "action"
            // of the url to include that, or be blank, else the next time
            // the user logs in they will be logged out again.
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            $action = hsc(substr($_SERVER['REQUEST_URI'], 0, strpos($_SERVER['REQUEST_URI'], '?')));
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        }
        else {
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            unset($get['login']);
            if (count($get)) {
                $action = '?' . http_build_query($get);
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            }
        }
    }
    if ($_POST) {
        foreach ($_POST as $key => $value) {
            if (!isset($elements[$key]) && !isset($elements['login']['elements'][$key])) {
                $elements[$key] = array(
                    'type'  => 'hidden',
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                    'value' => param_variable($key)
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                );
            }
        }
    }

    $form = array(
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        'name'           => 'login',
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        'renderer'       => 'div',
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        'method'         => 'post',
        'action'         => $action,
        'plugintype'     => 'auth',
        'pluginname'     => 'internal',
        'elements'       => $elements,
        'dieaftersubmit' => false,
        'iscancellable'  => false
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    );

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    return $form;
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}

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/**
 * Returns the definition of the login form elements.
 *
 * @return array   The login form elements array.
 * @access private
 */
function auth_get_login_form_elements() {
    // See if user can register
    if (count_records('institution', 'registerallowed', 1, 'suspended', 0)) {
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        $registerlink = '<a class="register-link text-small" href="' . get_config('wwwroot') . 'register.php">' . get_string('register') . '</a> |';
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    }
    else {
        $registerlink = '';
    }

    $elements = array(
        'login_username' => array(
            'type'        => 'text',
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            'class'       => 'fullwidth',
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            'title'       => get_string('username') . ':',
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            'defaultvalue' => param_exists('login_username') ? param_variable('login_username') : '',
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            'rules' => array(
                'required'    => true
            )
        ),
        'login_password' => array(
            'type'        => 'password',
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            'class'       => 'fullwidth',
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            'title'       => get_string('password') . ':',
            'defaultvalue'       => '',
            'rules' => array(
                'required'    => true
            )
        ),
        'submit' => array(
            'type'  => 'submit',
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            'class' => 'btn-primary btn-block',
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            'value' => get_string('login')
        ),
        'register' => array(
            'type' => 'markup',
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            'value' => '<div id="login-helplinks" class="login-related-links">' . $registerlink
                . '<a class="forgotpass-link text-small" href="' . get_config('wwwroot') . 'forgotpass.php">' . get_string('lostusernamepassword') . '</a></div>'
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        ),
    );
    $elements = array(
        'login' => array(
            'type' => 'container',
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            'class' => 'login form-condensed',
            'isformgroup' => false,
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            'elements' => $elements
        )
    );


    // Get any extra elements from the enabled auth plugins
    $extraelements = array();
    $showbasicform = false;
    $authplugins = auth_get_enabled_auth_plugins();
    foreach ($authplugins as $plugin) {
        $classname = 'PluginAuth' . ucfirst(strtolower($plugin));
        $pluginelements = call_static_method($classname, 'login_form_elements');
        if (!empty($pluginelements)) {
            $extraelements = array_merge($extraelements, $pluginelements);
        }
        if (call_static_method($classname, 'need_basic_login_form')) {
            $showbasicform = true;
        }
    }
    if (!empty($extraelements) && $showbasicform) {
        $loginlabel = array(
            'type' => 'markup',
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            'value' => '<p><a name="sso" />' . get_string('orloginvia') . '</p>'
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        );
        $extraelements = array_merge(array('label' => $loginlabel), $extraelements);
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        $keys = array_keys($extraelements);
        if (!empty($keys)) {
            $key = $keys[