<?php
/*
 +-------------------------------------------------------------------------+
 | Roundcube Webmail IMAP Client                                           |
 | Version 0.7                                                             |
 |                                                                         |
 | Copyright (C) 2005-2011, The Roundcube Dev Team                         |
 |                                                                         |
 | This program is free software; you can redistribute it and/or modify    |
 | it under the terms of the GNU General Public License version 2          |
 | as published by the Free Software Foundation.                           |
 |                                                                         |
 | 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., |
 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.             |
 |                                                                         |
 +-------------------------------------------------------------------------+
 | Author: Thomas Bruederli <roundcube@gmail.com>                          |
 +-------------------------------------------------------------------------+

 $Id: index.php 5582 2011-12-09 08:55:40Z thomasb $

*/

// include environment
require_once 'program/include/iniset.php';

// init application, start session, init output class, etc.
$RCMAIL = rcmail::get_instance();

// Make the whole PHP output non-cacheable (#1487797)
send_nocacheing_headers();

// turn on output buffering
ob_start();

// check if config files had errors
if ($err_str = $RCMAIL->config->get_error()) {
  raise_error(array(
    'code' => 601,
    'type' => 'php',
    'message' => $err_str), false, true);
}

// check DB connections and exit on failure
if ($err_str = $DB->is_error()) {
  raise_error(array(
    'code' => 603,
    'type' => 'db',
    'message' => $err_str), FALSE, TRUE);
}

// error steps
if ($RCMAIL->action=='error' && !empty($_GET['_code'])) {
  raise_error(array('code' => hexdec($_GET['_code'])), FALSE, TRUE);
}

// check if https is required (for login) and redirect if necessary
if (empty($_SESSION['user_id']) && ($force_https = $RCMAIL->config->get('force_https', false))) {
  $https_port = is_bool($force_https) ? 443 : $force_https;
  if (!rcube_https_check($https_port)) {
    $host  = preg_replace('/:[0-9]+$/', '', $_SERVER['HTTP_HOST']);
    $host .= ($https_port != 443 ? ':' . $https_port : '');
    header('Location: https://' . $host . $_SERVER['REQUEST_URI']);
    exit;
  }
}

// trigger startup plugin hook
$startup = $RCMAIL->plugins->exec_hook('startup', array('task' => $RCMAIL->task, 'action' => $RCMAIL->action));
$RCMAIL->set_task($startup['task']);
$RCMAIL->action = $startup['action'];

// try to log in
if ($RCMAIL->task == 'login' && $RCMAIL->action == 'login') {
  $request_valid = $_SESSION['temp'] && $RCMAIL->check_request(RCUBE_INPUT_POST, 'login');

  // purge the session in case of new login when a session already exists 
  $RCMAIL->kill_session();

  $auth = $RCMAIL->plugins->exec_hook('authenticate', array(
    'host' => $RCMAIL->autoselect_host(),
    'user' => trim(get_input_value('_user', RCUBE_INPUT_POST)),
    'pass' => get_input_value('_pass', RCUBE_INPUT_POST, true,
       $RCMAIL->config->get('password_charset', 'ISO-8859-1')),
    'cookiecheck' => true,
    'valid' => $request_valid,
  ));

  // check if client supports cookies
  if ($auth['cookiecheck'] && empty($_COOKIE)) {
    $OUTPUT->show_message("cookiesdisabled", 'warning');
  }
  else if ($auth['valid'] && !$auth['abort'] &&
        !empty($auth['host']) && !empty($auth['user']) &&
        $RCMAIL->login($auth['user'], $auth['pass'], $auth['host'])
  ) {
    // create new session ID, don't destroy the current session
    // it was destroyed already by $RCMAIL->kill_session() above
    $RCMAIL->session->remove('temp');
    $RCMAIL->session->regenerate_id(false);

    // send auth cookie if necessary
    $RCMAIL->session->set_auth_cookie();

    // log successful login
    rcmail_log_login();

    // restore original request parameters
    $query = array();
    if ($url = get_input_value('_url', RCUBE_INPUT_POST)) {
      parse_str($url, $query);

      // prevent endless looping on login page
      if ($query['_task'] == 'login')
        unset($query['_task']);
    }

    // allow plugins to control the redirect url after login success
    $redir = $RCMAIL->plugins->exec_hook('login_after', $query + array('_task' => 'mail'));
    unset($redir['abort'], $redir['_err']);

    // send redirect
    $OUTPUT->redirect($redir);
  }
  else {
    $error_code = is_object($IMAP) ? $IMAP->get_error_code() : -1;

    $OUTPUT->show_message($error_code < -1 ? 'imaperror' : (!$auth['valid'] ? 'invalidrequest' : 'loginfailed'), 'warning');
    $RCMAIL->plugins->exec_hook('login_failed', array(
      'code' => $error_code, 'host' => $auth['host'], 'user' => $auth['user']));
    $RCMAIL->kill_session();
  }
}

// end session (after optional referer check)
else if ($RCMAIL->task == 'logout' && isset($_SESSION['user_id']) && (!$RCMAIL->config->get('referer_check') || rcube_check_referer())) {
  $userdata = array('user' => $_SESSION['username'], 'host' => $_SESSION['imap_host'], 'lang' => $RCMAIL->user->language);
  $OUTPUT->show_message('loggedout');
  $RCMAIL->logout_actions();
  $RCMAIL->kill_session();
  $RCMAIL->plugins->exec_hook('logout_after', $userdata);
}

// check session and auth cookie
else if ($RCMAIL->task != 'login' && $_SESSION['user_id'] && $RCMAIL->action != 'send') {
  if (!$RCMAIL->session->check_auth()) {
    $RCMAIL->kill_session();
    $session_error = true;
  }
}

// not logged in -> show login page
if (empty($RCMAIL->user->ID)) {
  // log session failures
  if (($task = get_input_value('_task', RCUBE_INPUT_GPC)) && !in_array($task, array('login','logout')) && !$session_error && ($sess_id = $_COOKIE[ini_get('session.name')])) {
    $RCMAIL->session->log("Aborted session " . $sess_id . "; no valid session data found");
    $session_error = true;
  }

  if ($OUTPUT->ajax_call)
    $OUTPUT->redirect(array('_err' => 'session'), 2000);

  if (!empty($_REQUEST['_framed']))
    $OUTPUT->command('redirect', $RCMAIL->url(array('_err' => 'session')));

  // check if installer is still active
  if ($RCMAIL->config->get('enable_installer') && is_readable('./installer/index.php')) {
    $OUTPUT->add_footer(html::div(array('style' => "background:#ef9398; border:2px solid #dc5757; padding:0.5em; margin:2em auto; width:50em"),
      html::tag('h2', array('style' => "margin-top:0.2em"), "Installer script is still accessible") .
      html::p(null, "The install script of your Roundcube installation is still stored in its default location!") .
      html::p(null, "Please <b>remove</b> the whole <tt>installer</tt> folder from the Roundcube directory because .
        these files may expose sensitive configuration data like server passwords and encryption keys
        to the public. Make sure you cannot access the <a href=\"./installer/\">installer script</a> from your browser.")
      )
    );
  }

  if ($session_error || $_REQUEST['_err'] == 'session')
    $OUTPUT->show_message('sessionerror', 'error', null, true, -1);

  $RCMAIL->set_task('login');
  $OUTPUT->send('login');
}
// CSRF prevention
else {
  // don't check for valid request tokens in these actions
  $request_check_whitelist = array('login'=>1, 'spell'=>1);

  // check client X-header to verify request origin
  if ($OUTPUT->ajax_call) {
    if (rc_request_header('X-Roundcube-Request') != $RCMAIL->get_request_token() && !$RCMAIL->config->get('devel_mode')) {
      header('HTTP/1.1 403 Forbidden');
      die("Invalid Request");
    }
  }
  // check request token in POST form submissions
  else if (!empty($_POST) && !$request_check_whitelist[$RCMAIL->action] && !$RCMAIL->check_request()) {
    $OUTPUT->show_message('invalidrequest', 'error');
    $OUTPUT->send($RCMAIL->task);
  }

  // check referer if configured
  if (!$request_check_whitelist[$RCMAIL->action] && $RCMAIL->config->get('referer_check') && !rcube_check_referer()) {
    raise_error(array(
      'code' => 403,
      'type' => 'php',
      'message' => "Referer check failed"), true, true);
  }
}

// we're ready, user is authenticated and the request is safe
$plugin = $RCMAIL->plugins->exec_hook('ready', array('task' => $RCMAIL->task, 'action' => $RCMAIL->action));
$RCMAIL->set_task($plugin['task']);
$RCMAIL->action = $plugin['action'];


// handle special actions
if ($RCMAIL->action == 'keep-alive') {
  $OUTPUT->reset();
  $RCMAIL->plugins->exec_hook('keep_alive', array());
  $OUTPUT->send();
}
else if ($RCMAIL->action == 'save-pref') {
  include INSTALL_PATH . 'program/steps/utils/save_pref.inc';
}


// include task specific functions
if (is_file($incfile = INSTALL_PATH . 'program/steps/'.$RCMAIL->task.'/func.inc'))
  include_once $incfile;

// allow 5 "redirects" to another action
$redirects = 0; $incstep = null;
while ($redirects < 5) {
  // execute a plugin action
  if ($RCMAIL->plugins->is_plugin_task($RCMAIL->task)) {
    if (!$RCMAIL->action) $RCMAIL->action = 'index';
    $RCMAIL->plugins->exec_action($RCMAIL->task.'.'.$RCMAIL->action);
    break;
  }
  else if (preg_match('/^plugin\./', $RCMAIL->action)) {
    $RCMAIL->plugins->exec_action($RCMAIL->action);
    break;
  }
  // try to include the step file
  else if (($stepfile = $RCMAIL->get_action_file())
    && is_file($incfile = INSTALL_PATH . 'program/steps/'.$RCMAIL->task.'/'.$stepfile)
  ) {
    include $incfile;
    $redirects++;
  }
  else {
    break;
  }
}


// parse main template (default)
$OUTPUT->send($RCMAIL->task);


// if we arrive here, something went wrong
raise_error(array(
  'code' => 404,
  'type' => 'php',
  'line' => __LINE__,
  'file' => __FILE__,
  'message' => "Invalid request"), true, true);