<?php
/***************************************************************************
 *  Copyright (C) 2003-2008 Polytechnique.org                              *
 *  http://opensource.polytechnique.org/                                   *
 *                                                                         *
 *  This program is free software; you can redistribute it and/or modify   *
 *  it under the terms of the GNU General Public License as published by   *
 *  the Free Software Foundation; either version 2 of the License, or      *
 *  (at your option) any later version.                                    *
 *                                                                         *
 *  This program is distributed in the hope that it will be useful,        *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *  GNU General Public License for more details.                           *
 *                                                                         *
 *  You should have received a copy of the GNU General Public License      *
 *  along with this program; if not, write to the Free Software            *
 *  Foundation, Inc.,                                                      *
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA                *
 ***************************************************************************/

require_once 'xorg.misc.inc.php';

class XorgSession
{
    public function __construct() {
        XorgSession::init();
    }

    // {{{ public static function init

    public static function init()
    {
        S::init();
        if (!S::has('uid')) {
            try_cookie();
        }
        if ((check_ip('dangerous') && S::has('uid')) || check_account()) {
            $_SESSION['log']->log("view_page", $_SERVER['REQUEST_URI']);
        }
    }

    // }}}
    // {{{ public static function destroy()

    public static function destroy()
    {
        S::destroy();
        XorgSession::init();
    }

    // }}}
    // {{{ public static function doAuth()

    public static function doAuth($new_name = false)
    {
        global $globals;
        if (S::identified()) { // ok, c'est bon, on n'a rien à faire
            return true;
        }

        if (!Env::has('username') || !Env::has('response')
        ||  !S::has('challenge'))
        {
            return false;
        }

        // si on vient de recevoir une identification par passwordpromptscreen.tpl
        // ou passwordpromptscreenlogged.tpl
        if (S::has('suid')) {
            $suid = S::v('suid');
            $login = $uname = $suid['forlife'];
            $redirect = false;
        } else {
            $uname = Env::v('username');

            if (Env::v('domain') == "alias") {
                $res = XDB::query(
                    "SELECT redirect
                       FROM virtual
                 INNER JOIN virtual_redirect USING(vid)
                      WHERE alias LIKE {?}", $uname."@".$globals->mail->alias_dom);
                $redirect = $res->fetchOneCell();
                if ($redirect) {
                    $login = substr($redirect, 0, strpos($redirect, '@'));
                } else {
                    $login = "";
                }
            } else {
                $login = $uname;
                $redirect = false;
            }
        }

        $field = (!$redirect && preg_match('/^\d*$/', $uname)) ? 'id' : 'alias';
        $res   = XDB::query(
                    "SELECT  u.user_id, u.password
                       FROM  auth_user_md5 AS u
                 INNER JOIN  aliases       AS a ON ( a.id=u.user_id AND type!='homonyme' )
                      WHERE  a.$field = {?} AND u.perms IN('admin','user')", $login);

        $logger = S::v('log');
        if (list($uid, $password) = $res->fetchOneRow()) {
            require_once('secure_hash.inc.php');
            $expected_response = hash_encrypt("$uname:$password:".S::v('challenge'));
            // le password de la base est peut-être encore encodé en md5
            if (Env::v('response') != $expected_response) {
                $new_password = hash_xor(Env::v('xorpass'), $password);
                $expected_response = hash_encrypt("$uname:$new_password:".S::v('challenge'));
                if (Env::v('response') == $expected_response) {
                      XDB::execute("UPDATE auth_user_md5 SET password = {?} WHERE user_id = {?}",
                                   $new_password, $uid);
                }
            }
            if (Env::v('response') == $expected_response) {
                if (Env::has('domain')) {
                    if (($domain = Env::v('domain', 'login')) == 'alias') {
                        setcookie('ORGdomain', "alias", (time()+25920000), '/', '', 0);
                    } else {
                        setcookie('ORGdomain', '', (time()-3600), '/', '', 0);
                    }
                    // pour que la modification soit effective dans le reste de la page
                    $_COOKIE['ORGdomain'] = $domain;
                }

                S::kill('challenge');
                if ($logger) {
                    $logger->log('auth_ok');
                }
                if (!start_connexion($uid, true)) {
                    return false;
                }
                if (Env::v('remember', 'false') == 'true') {
                    $cookie = hash_encrypt(S::v('password'));
                    setcookie('ORGaccess',$cookie,(time()+25920000),'/','',0);
                    if ($logger) {
                        $logger->log("cookie_on");
                    }
                } else {
                    setcookie('ORGaccess', '', time() - 3600, '/', '', 0);

                    if ($logger) {
                        $logger->log("cookie_off");
                    }
                }
                return true;
            } elseif ($logger) {
                $logger->log('auth_fail','bad password');
            }
        } elseif ($logger) {
            $logger->log('auth_fail','bad login');
        }

        return false;
    }

    // }}}
    // {{{ public static function doAuthCookie()

    /** Try to do a cookie-based authentication.
     *
     * @param page the calling page (by reference)
     */
    public static function doAuthCookie()

    {
        if (S::logged()) {
            return true;
        }

        if (Env::has('username') and Env::has('response')) {
            return XorgSession::doAuth();
        }

        if ($r = try_cookie()) {
            return XorgSession::doAuth(($r > 0));
        }

        return false;
    }

    // }}}
    // {{{ public static function make_perms()

    public static function &make_perms($perm)
    {
        $flags = new PlFlagSet();
        if ($perm == 'disabled' || $perm == 'ext') {
            return $flags;
        }
        $flags->addFlag(PERMS_USER);
        if ($perm == 'admin') {
            $flags->addFlag(PERMS_ADMIN);
        }
        return $flags;
    }

    // }}}
}

// {{{ function try_cookie()

/** réalise la récupération de $_SESSION pour qqn avec cookie
 * @return  int     0 if all OK, -1 if no cookie, 1 if cookie with bad hash,
 *                  -2 should not happen
 */
function try_cookie()
{
    if (Cookie::v('ORGaccess') == '' or !Cookie::has('ORGuid')) {
        return -1;
    }

    $res = @XDB::query(
            "SELECT user_id,password FROM auth_user_md5
              WHERE user_id = {?} AND perms IN('admin','user')",
            Cookie::i('ORGuid'));

    if ($res->numRows() != 0) {
        list($uid, $password) = $res->fetchOneRow();
        require_once('secure_hash.inc.php');
        $expected_value       = hash_encrypt($password);
        if ($expected_value == Cookie::v('ORGaccess')) {
            if (!start_connexion($uid, false)) {
                return -3;
            }
            return 0;
        } else {
            return 1;
        }
    }

    return -2;
}

// }}}
// {{{ function start_connexion()

/** place les variables de session dépendants de auth_user_md5
 * et met à jour les dates de dernière connexion si nécessaire
 * @return void
 * @see controlpermanent.inc.php controlauthentication.inc.php
 */
function start_connexion ($uid, $identified)
{
    $res  = XDB::query("
        SELECT  u.user_id AS uid, prenom, prenom_ini, nom, nom_ini, nom_usage, perms, promo, promo_sortie,
                matricule, password, FIND_IN_SET('femme', u.flags) AS femme,
                a.alias AS forlife, a2.alias AS bestalias,
                q.core_mail_fmt AS mail_fmt, UNIX_TIMESTAMP(q.banana_last) AS banana_last, q.watch_last, q.core_rss_hash,
                FIND_IN_SET('watch', u.flags) AS watch_account, q.last_version
          FROM  auth_user_md5   AS u
    INNER JOIN  auth_user_quick AS q  USING(user_id)
    INNER JOIN  aliases         AS a  ON (u.user_id = a.id AND a.type='a_vie')
    INNER JOIN  aliases         AS a2 ON (u.user_id = a2.id AND FIND_IN_SET('bestalias',a2.flags))
         WHERE  u.user_id = {?} AND u.perms IN('admin','user')", $uid);
    $sess = $res->fetchOneAssoc();
    $res = XDB::query("SELECT  UNIX_TIMESTAMP(s.start) AS lastlogin, s.host
                         FROM  logger.sessions AS s
                        WHERE  s.uid = {?} AND s.suid = 0
                     ORDER BY  s.start DESC
                        LIMIT  1", $uid);
    if ($res->numRows()) {
        $sess = array_merge($sess, $res->fetchOneAssoc());
    }
    $suid = S::v('suid');

    if ($suid) {
        $logger = new PlLogger($uid, $suid['uid']);
        $logger->log("suid_start", S::v('forlife')." by {$suid['uid']}");
        $sess['suid'] = $suid;
    } else {
        $logger = S::v('log', new PlLogger($uid));
        $logger->log("connexion", Env::v('n'));
        setcookie('ORGuid', $uid, (time()+25920000), '/', '', 0);
    }

    $_SESSION         = array_merge($_SESSION, $sess);
    $_SESSION['log']  = $logger;
    $_SESSION['auth'] = ($identified ? AUTH_MDP : AUTH_COOKIE);
    $_SESSION['perms'] =& XorgSession::make_perms($_SESSION['perms']);
    $mail_subject = null;
    if (check_account()) {
        $mail_subject = "Connexion d'un utilisateur surveillé";
    }
    if (check_ip('unsafe')) {
        if ($mail_subject) {
            $mail_subject .= ' - ';
        }
        $mail_subject .= "Une IP surveillee a tente de se connecter";
        if (check_ip('ban')) {
            send_warning_mail($mail_subject);
            $_SESSION = array();
            $_SESSION['perms'] = new PlFlagSet();
            global $page;
            $newpage = false;
            if (!$page) {
                $page =& Platal::page();
                $newpage = true;
            }
            $page->trigError("Une erreur est survenue lors de la procédure d'authentification. "
                       ."Merci de contacter au plus vite "
                       ."<a href='mailto:support@polytechnique.org'>support@polytechnique.org</a>");
            if ($newpage) {
                $page->run();
            }
            return false;
        }
    }
    if ($mail_subject) {
        send_warning_mail($mail_subject);
    }
    set_skin();
    update_NbNotifs();
    check_redirect();
    return true;
}

// }}}

function set_skin()
{
    global $globals;
    if (S::logged() && (!S::has('skin') || S::has('suid'))) {
        $uid = S::v('uid');
        $res = XDB::query("SELECT  skin_tpl
                          FROM  auth_user_quick AS a
                          INNER JOIN  skins           AS s ON a.skin = s.id
                          WHERE  user_id = {?} AND skin_tpl != ''", $uid);
        if ($_SESSION['skin'] = $res->fetchOneCell()) {
            return;
        }
    }
}

// vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8:
?>