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<?php

/*
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Copyright (c) 2005 - 2015, Till Brehm, ISPConfig UG
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All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name of ISPConfig nor the names of its contributors
      may be used to endorse or promote products derived from this software without
      specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

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require_once '../../lib/config.inc.php';
require_once '../../lib/app.inc.php';

// Check if we have an active users ession and no login_as.
if($_SESSION['s']['user']['active'] == 1 && @$_POST['login_as'] != 1) {
	header('Location: /index.php');
	die();
}

$app->uses('tpl');
$app->tpl->newTemplate('main_login.tpl.htm');
$app->tpl->setInclude('content_tpl', 'templates/index.htm');

$error = '';

$app->load_language_file('web/login/lib/lang/'.$conf["language"].'.lng');

// Maintenance mode
$maintenance_mode = false;
$maintenance_mode_error = '';
$app->uses('ini_parser,getconf');
$server_config_array = $app->getconf->get_global_config('misc');
if($server_config_array['maintenance_mode'] == 'y'){
	$maintenance_mode = true;
	$maintenance_mode_error = $app->lng('error_maintenance_mode');
}

//* Login Form was sent
if(count($_POST) > 0) {

	//** Check variables
	if(!preg_match("/^[\w\.\-\_\@]{1,128}$/", $_POST['username'])) $error = $app->lng('user_regex_error');
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	if(!preg_match("/^.{1,256}$/i", $_POST['password'])) $error = $app->lng('pw_error_length');
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	//** importing variables
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	$ip = md5($_SERVER['REMOTE_ADDR']);
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	$username = $_POST['username'];
	$password = $_POST['password'];
	$loginAs  = false;
	$time = time();

	if($username != '' && $password != '' && $error == '') {
		/*
		 *  Check, if there is a "login as" instead of a "normal" login
		 */
		if (isset($_SESSION['s']['user']) && $_SESSION['s']['user']['active'] == 1){
			/*
			 * only the admin or reseller can "login as" so if the user is NOT an admin or reseller, we
			 * open the startpage (after killing the old session), so the user
			 * is logout and has to start again!
			 */
			if ($_SESSION['s']['user']['typ'] != 'admin' && !$app->auth->has_clients($_SESSION['s']['user']['userid'])) {
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				/*
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				 * The actual user is NOT a admin or reseller, but maybe he
				 * has logged in as "normal" user before...
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				 */
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				if (isset($_SESSION['s_old'])&& ($_SESSION['s_old']['user']['typ'] == 'admin' || $app->auth->has_clients($_SESSION['s_old']['user']['userid']))){
					/* The "old" user is admin or reseller, so everything is ok
					 * if he is reseller, we need to check if he logs in to one of his clients
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					 */
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					if($_SESSION['s_old']['user']['typ'] != 'admin') {
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						/* this is the one currently logged in (normal user) */
						$old_client_group_id = $app->functions->intval($_SESSION["s"]["user"]["default_group"]);
						$old_client = $app->db->queryOneRecord("SELECT client.client_id, client.parent_client_id FROM sys_group, client WHERE sys_group.client_id = client.client_id and sys_group.groupid = ?", $old_client_group_id);
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						/* this is the reseller, that shall be re-logged in */
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						$sql = "SELECT * FROM sys_user WHERE USERNAME = ? and PASSWORT = ?";
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						$tmp = $app->db->queryOneRecord($sql, $username, $password);
						$client_group_id = $app->functions->intval($tmp['default_group']);
						$tmp_client = $app->db->queryOneRecord("SELECT client.client_id FROM sys_group, client WHERE sys_group.client_id = client.client_id and sys_group.groupid = ?", $client_group_id);
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						if(!$tmp_client || $old_client["parent_client_id"] != $tmp_client["client_id"] || $tmp["default_group"] != $_SESSION["s_old"]["user"]["default_group"] ) {
							die("You don't have the right to 'login as' this user!");
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						}
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						unset($old_client);
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						unset($tmp_client);
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						unset($tmp);
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					}
				}
				else {
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					die("You don't have the right to 'login as'!");
				}
			} elseif($_SESSION['s']['user']['typ'] != 'admin' && (!isset($_SESSION['s_old']['user']) || $_SESSION['s_old']['user']['typ'] != 'admin')) {
				/* a reseller wants to 'login as', we need to check if he is allowed to */
				$res_client_group_id = $app->functions->intval($_SESSION["s"]["user"]["default_group"]);
				$res_client = $app->db->queryOneRecord("SELECT client.client_id FROM sys_group, client WHERE sys_group.client_id = client.client_id and sys_group.groupid = ?", $res_client_group_id);
				
				/* this is the user the reseller wants to 'login as' */
				$sql = "SELECT * FROM sys_user WHERE USERNAME = ? and PASSWORT = ?";
				$tmp = $app->db->queryOneRecord($sql, $username, $password);
				$tmp_client = $app->db->queryOneRecord("SELECT client.client_id, client.parent_client_id FROM sys_group, client WHERE sys_group.client_id = client.client_id and sys_group.groupid = ?", $tmp["default_group"]);
				
				if(!$tmp || $tmp_client["parent_client_id"] != $res_client["client_id"]) {
					die("You don't have the right to login as this user!");
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				}
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				unset($res_client);
				unset($tmp);
				unset($tmp_client);
			}
			$loginAs = true;
			
		} else {
			/* normal login */
			$loginAs = false;
		}
		
		//* Check if there are already wrong logins
		$sql = "SELECT * FROM `attempts_login` WHERE `ip`= ? AND  `login_time` > (NOW() - INTERVAL 1 MINUTE) LIMIT 1";
		$alreadyfailed = $app->db->queryOneRecord($sql, $ip);
		
		//* too many failedlogins
		if($alreadyfailed['times'] > 5) {
			$error = $app->lng('error_user_too_many_logins');
		} else {
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			if ($loginAs){
				$sql = "SELECT * FROM sys_user WHERE USERNAME = ? and PASSWORT = ?";
				$user = $app->db->queryOneRecord($sql, $username, $password);
			} else {
			
				if(stristr($username, '@')) {
					//* mailuser login
					$sql = "SELECT * FROM mail_user WHERE login = ? or email = ?";
					$mailuser = $app->db->queryOneRecord($sql, $username, $username);
					$user = false;
					if($mailuser) {
						$saved_password = stripslashes($mailuser['password']);
						//* Check if mailuser password is correct
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						if(crypt(stripslashes($password), $saved_password) == $saved_password) {
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							//* Get the sys_user language of the client of the mailuser
							$sys_user_lang = $app->db->queryOneRecord("SELECT language FROM sys_user WHERE default_group = ?", $mailuser['sys_groupid'] );
							
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							//* we build a fake user here which has access to the mailuser module only and userid 0
							$user = array();
							$user['userid'] = 0;
							$user['active'] = 1;
							$user['startmodule'] = 'mailuser';
							$user['modules'] = 'mailuser';
							$user['typ'] = 'user';
							$user['email'] = $mailuser['email'];
							$user['username'] = $username;
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							if(is_array($sys_user_lang) && $sys_user_lang['language'] != '') {
								$user['language'] = $sys_user_lang['language'];
							} else {
								$user['language'] = $conf['language'];
							}
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							$user['theme'] = $conf['theme'];
							$user['app_theme'] = $conf['theme'];
							$user['mailuser_id'] = $mailuser['mailuser_id'];
							$user['default_group'] = $mailuser['sys_groupid'];
						}
					}
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				} else {
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					//* normal cp user login
					$sql = "SELECT * FROM sys_user WHERE USERNAME = ?";
					$user = $app->db->queryOneRecord($sql, $username);
					if($user) {
						$saved_password = stripslashes($user['passwort']);
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						if(substr($saved_password, 0, 1) == '$') {
							//* The password is encrypted with crypt
							if(crypt(stripslashes($password), $saved_password) != $saved_password) {
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								$user = false;
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							}
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						} else {
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							//* The password is md5 encrypted
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							if(md5($password) != $saved_password) {
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								$user = false;
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							}
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						}
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					} else {
						$user = false;
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					}
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				}
			}
			
			if($user) {
				if($user['active'] == 1) {
					// Maintenance mode - allow logins only when maintenance mode is off or if the user is admin
					if(!$maintenance_mode || $user['typ'] == 'admin'){
						
						// User login right, so attempts can be deleted
						$sql = "DELETE FROM `attempts_login` WHERE `ip`=?";
						$app->db->query($sql, $ip);
						$user = $app->db->toLower($user);
						
						if ($loginAs) $oldSession = $_SESSION['s'];
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						// Session regenerate causes login problems on some systems, see Issue #3827
						// Set session_regenerate_id to no in security settings, it you encounter
						// this problem.
						$app->uses('getconf');
						$security_config = $app->getconf->get_security_config('permissions');
						if(isset($security_config['session_regenerate_id']) && $security_config['session_regenerate_id'] == 'yes') {
							if (!$loginAs) session_regenerate_id(true);
						}
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						$_SESSION = array();
						if ($loginAs) $_SESSION['s_old'] = $oldSession; // keep the way back!
						$_SESSION['s']['user'] = $user;
						$_SESSION['s']['user']['theme'] = isset($user['app_theme']) ? $user['app_theme'] : 'default';
						$_SESSION['s']['language'] = $user['language'];
						$_SESSION["s"]['theme'] = $_SESSION['s']['user']['theme'];
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						if ($loginAs) $_SESSION['s']['plugin_cache'] = $_SESSION['s_old']['plugin_cache'];
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						if(is_file(ISPC_WEB_PATH . '/' . $_SESSION['s']['user']['startmodule'].'/lib/module.conf.php')) {
							include_once ISPC_WEB_PATH . '/' . $_SESSION['s']['user']['startmodule'].'/lib/module.conf.php';
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							$menu_dir = ISPC_WEB_PATH.'/' . $_SESSION['s']['user']['startmodule'] . '/lib/menu.d';
								if (is_dir($menu_dir)) {
								if ($dh = opendir($menu_dir)) {
									//** Go through all files in the menu dir
									while (($file = readdir($dh)) !== false) {
										if ($file != '.' && $file != '..' && substr($file, -9, 9) == '.menu.php' && $file != 'dns_resync.menu.php') {
											include_once $menu_dir . '/' . $file;
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										}
									}
								}
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							}
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							$_SESSION['s']['module'] = $module;
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						}
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							// check if the user theme is valid
						if($_SESSION['s']['user']['theme'] != 'default') {
							$tmp_path = ISPC_THEMES_PATH."/".$_SESSION['s']['user']['theme'];
							if(!@is_dir($tmp_path) || !@file_exists($tmp_path."/ispconfig_version") || trim(file_get_contents($tmp_path."/ispconfig_version")) != ISPC_APP_VERSION) {
								// fall back to default theme if this one is not compatible with current ispc version
								$_SESSION['s']['user']['theme'] = 'default';
								$_SESSION['s']['theme'] = 'default';
								$_SESSION['show_error_msg'] = $app->lng('theme_not_compatible');
							}
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						}
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						$app->plugin->raiseEvent('login', $username);
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						//* Save successfull login message to var
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						$authlog = 'Successful login for user \''. $username .'\' from '. $_SERVER['REMOTE_ADDR'] .' at '. date('Y-m-d H:i:s');
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						$authlog_handle = fopen($conf['ispconfig_log_dir'].'/auth.log', 'a');
						fwrite($authlog_handle, $authlog ."\n");
						fclose($authlog_handle);
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						// get last IP used to login 
						$user_data = $app->db->queryOneRecord("SELECT last_login_ip,last_login_at FROM sys_user WHERE username = ?", $username);
						
						$_SESSION['s']['last_login_ip'] = $user_data['last_login_ip'];
						$_SESSION['s']['last_login_at'] = $user_data['last_login_at'];
						if(!$loginAs) {
							$app->db->query("UPDATE sys_user SET last_login_ip =  ?, last_login_at = ? WHERE username = ?", $_SERVER['REMOTE_ADDR'], time(), $username);
						}
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						/*
						* We need LOGIN_REDIRECT instead of HEADER_REDIRECT to load the
						* new theme, if the logged-in user has another
						*/
						
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						if($loginAs) {
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							echo 'LOGIN_REDIRECT:'.$_SESSION['s']['module']['startpage'];
							exit;
						} else {
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							header('Location: ../index.php');
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							die();
						}
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					}
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				} else {
					$error = $app->lng('error_user_blocked');
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				}
			} else {
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				if(!$alreadyfailed['times']) {
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					//* user login the first time wrong
					$sql = "INSERT INTO `attempts_login` (`ip`, `times`, `login_time`) VALUES (?, 1, NOW())";
					$app->db->query($sql, $ip);
				} elseif($alreadyfailed['times'] >= 1) {
					//* update times wrong
					$sql = "UPDATE `attempts_login` SET `times`=`times`+1, `login_time`=NOW() WHERE `ip` = ? AND `login_time` < NOW() ORDER BY `login_time` DESC LIMIT 1";
					$app->db->query($sql, $ip);
				}
				//* Incorrect login - Username and password incorrect
				$error = $app->lng('error_user_password_incorrect');
				if($app->db->errorMessage != '') $error .= '<br />'.$app->db->errorMessage != '';

				$app->plugin->raiseEvent('login_failed', $this);
				//* Save failed login message to var
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				$authlog = 'Failed login for user \''. $username .'\' from '. $_SERVER['REMOTE_ADDR'] .' at '. date('Y-m-d H:i:s');
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				$authlog_handle = fopen($conf['ispconfig_log_dir'].'/auth.log', 'a');
				fwrite($authlog_handle, $authlog ."\n");
				fclose($authlog_handle);
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			}
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		}
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		} else {
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		//* Username or password empty
		if($error == '') $error = $app->lng('error_user_password_empty');
			$app->plugin->raiseEvent('login_empty', $this);
	}
}

// Maintenance mode - show message when people try to log in and also when people are forcedly logged off
if($maintenance_mode_error != '') $error = '<strong>'.$maintenance_mode_error.'</strong><br><br>'.$error;
if($error != ''){
	$error = '<div class="box box_error">'.$error.'</div>';
}

$app->load('getconf');
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$sys_config = $app->getconf->get_global_config('misc');
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$security_config = $app->getconf->get_security_config('permissions');
if($security_config['password_reset_allowed'] == 'yes') {
	$app->tpl->setVar('pw_lost_show', 1);
} else {
	$app->tpl->setVar('pw_lost_show', 0);
}
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$app->tpl->setVar('error', $error);
$app->tpl->setVar('error_txt', $app->lng('error_txt'));
$app->tpl->setVar('login_txt', $app->lng('login_txt'));
$app->tpl->setVar('pw_lost_txt', $app->lng('pw_lost_txt'));
$app->tpl->setVar('username_txt', $app->lng('username_txt'));
$app->tpl->setVar('password_txt', $app->lng('password_txt'));
$app->tpl->setVar('stay_logged_in_txt', $app->lng('stay_logged_in_txt'));
$app->tpl->setVar('login_button_txt', $app->lng('login_button_txt'));
$app->tpl->setVar('session_timeout', $server_config_array['session_timeout']);
$app->tpl->setVar('session_allow_endless', $server_config_array['session_allow_endless']);
//$app->tpl->setInclude('content_tpl', 'login/templates/index.htm');
$app->tpl->setVar('current_theme', isset($_SESSION['s']['theme']) ? $_SESSION['s']['theme'] : 'default');
//die(isset($_SESSION['s']['theme']) ? $_SESSION['s']['theme'] : 'default');

// Logo
$logo = $app->db->queryOneRecord("SELECT * FROM sys_ini WHERE sysini_id = 1");
if($logo['custom_logo'] != ''){
	$base64_logo_txt = $logo['custom_logo'];
} else {
	$base64_logo_txt = $logo['default_logo'];
}
$tmp_base64 = explode(',', $base64_logo_txt, 2);
$logo_dimensions = $app->functions->getimagesizefromstring(base64_decode($tmp_base64[1]));
$app->tpl->setVar('base64_logo_width', $logo_dimensions[0].'px');
$app->tpl->setVar('base64_logo_height', $logo_dimensions[1].'px');
$app->tpl->setVar('base64_logo_txt', $base64_logo_txt);

// Title
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if (!empty($sys_config['company_name'])) {
	$app->tpl->setVar('company_name', $sys_config['company_name']. ' :: ');
}
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// Custom Login
if ($sys_config['custom_login_text'] != '') {
	 $custom_login = @($sys_config['custom_login_link'] != '')?'<a href="'.$sys_config['custom_login_link'].'" target="_blank">'.$sys_config['custom_login_text'].'</a>':$sys_config['custom_login_text'];
}
$app->tpl->setVar('custom_login', $custom_login);

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$app->tpl_defaults();

$app->tpl->pparse();
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?>