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login.php
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login.php
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<?php
// Copyright (C) 2014-2018 Universitätsbibliothek Mannheim
// See file LICENSE for license details.
// This file implements user authorization.
// PalMA installation can authorize users by a PIN, by a
// user name and by a password.
// The PIN is a four digit random number which is changed for
// every new session.
// Authorization with a user name and a password requires code
// which implements the authorization mechanism (for example
// proxy based authorization, LDAP, Shibboleth, fixed password).
// Password authorization can optionally be disabled.
// Connect to database and get configuration constants.
require_once('DBConnector.class.php');
$dbcon = new palma\DBConnector();
require_once('i12n.php');
require_once('globals.php');
$errtext = false;
function getDevice()
{
// Try to determine the user's device type. The device which is
// returned is used to select the matching icon for the user list.
$agent = $_SERVER["HTTP_USER_AGENT"];
if (preg_match('/iPad/', $agent)) {
$device = 'tablet';
} elseif (preg_match('/iPhone/', $agent)) {
$device = 'mobile';
} elseif (preg_match('/Android/', $agent)) {
$device = 'android';
} elseif (preg_match('/Linux/', $agent)) {
$device = 'linux';
} elseif (preg_match('/OS X/', $agent)) {
$device = 'apple';
} elseif (preg_match('/Windows/', $agent)) {
$device = 'windows';
} else {
$device = 'laptop';
}
return $device;
}
function checkCredentials($username, $password)
{
// Check username + password against fixed internal value and
// external proxy with authentisation.
global $errtext;
$remote = $_SERVER['REMOTE_ADDR'];
if ($username == 'chef' && $password == 'chef') {
if ($remote == '::1' || $remote == '127.0.0.1' ||
preg_match('/^134[.]155[.]36[.]/', $remote) &&
$remote != '134.155.36.48') {
// Allow test access for restricted remote hosts (localhost,
// UB Mannheim library staff, but not via proxy server).
// TODO: PalMA installations which are accessible from
// the Internet may want to remove this test access.
return true;
} else {
trace("Test access not allowed for IP address $remote");
return false;
}
}
if ($username == '' || $password == '') {
// Don't allow empty user name or password.
// Proxy authentisation can fail with empty values.
trace("access denied for user '$username'");
return false;
}
// TODO: testurl sollte auf einem lokalen Server liegen.
$testurl = 'http://www.weilnetz.de/proxytest';
$proxy = 'proxy.bib.uni-mannheim.de:3150';
$curl = curl_init($testurl);
curl_setopt($curl, CURLOPT_HEADER, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_PROXY, $proxy);
curl_setopt($curl, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
curl_setopt($curl, CURLOPT_PROXYUSERPWD, "$username:$password");
//~ trace("Start curl");
$out = curl_exec($curl);
curl_close($curl);
if (!$out) {
trace("curl failed for user '$username'");
$errtext = addslashes(__('Invalid credentials!'));
} elseif (preg_match('/404 Not Found/', $out)) {
return true;
} elseif (preg_match('/Could not resolve proxy/', $out)) {
trace('proxy authentisation was not possible');
$errtext = addslashes(__('Cannot check credentials, sorry!'));
} elseif (preg_match('/Cache Access Denied/', $out)) {
trace("access denied for user '$username'");
$errtext = addslashes(__('Invalid credentials!'));
} else {
trace("access not possible for user '$username'");
$errtext = addslashes(__('Invalid credentials!'));
}
return false;
}
$username = '';
$pin = '';
$posted_pin = '';
if (isset($_REQUEST['pin'])) {
$posted_pin = escapeshellcmd($_REQUEST['pin']);
}
require_once('globals.php');
monitor("login.php: page loaded");
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
session_start();
$username = escapeshellcmd($_POST['username']);
$password = '';
if (CONFIG_PASSWORD) {
// The password must not be escaped.
$password = $_POST['userpassword'];
}
if (CONFIG_PIN) {
$posted_pin = escapeshellcmd($_POST['pin']);
$pin = $dbcon->querySingle("SELECT value FROM setting WHERE key = 'pin'");
}
if (CONFIG_PASSWORD && !checkCredentials($username, $password)) {
monitor("login.php: access denied for user '$username'");
// Invalid username or password.
} elseif (CONFIG_PIN && ($pin != $posted_pin)) {
monitor("login.php: access denied for user '$username': invalid pin");
trace("access denied for user '$username', wrong pin $posted_pin");
$errtext = addslashes(__('Invalid PIN.'));
} else {
// Successfully checked username, password and PIN.
monitor("login.php: access granted for user '$username'");
trace("access granted for user '$username'");
$_SESSION['username'] = $username;
$_SESSION['address'] = $dbcon->ipAddress();
$_SESSION['pin'] = $pin;
$_SESSION['starturl'] = CONFIG_START_URL;
$_SESSION['monitor'] = CONFIG_STATIONNAME;
$dbcon->addUser($username, $dbcon->ipAddress(), getDevice());
// Weiterleitung zur geschützten Startseite
if ($_SERVER['SERVER_PROTOCOL'] == 'HTTP/1.1') {
if (php_sapi_name() == 'cgi') {
header('Status: 303 See Other');
} else {
header('HTTP/1.1 303 See Other');
}
}
trace(CONFIG_START_URL);
header('Location: ' . CONFIG_START_URL);
exit;
}
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="de">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title><?=addslashes(__("PalMA – Login"))?></title>
<link rel="icon" href="theme/<?=CONFIG_THEME?>/favicon.ico" type="image/x-icon">
<link rel="stylesheet" href="font-awesome/css/font-awesome.min.css">
<link rel="stylesheet" href="pure-min.css">
<link rel="stylesheet" href="palma.css">
</head>
<!--
Copyright (C) 2014 Stefan Weil, Universitätsbibliothek Mannheim
TODO:
* Use 'placeholder' attribute for input fields.
-->
<body onLoad="document.forms.auth.username.focus()">
<div id="login_mask">
<form name="auth" class="pure-form pure-form-aligned" action="login.php" method="post">
<fieldset class="login">
<legend>
<img src="theme/<?=CONFIG_THEME?>/palma-logo-67x25.png" alt="PalMA" height="25"/>
– <?=addslashes(__("Login"))?>
</legend>
<div id="login_fields">
<div class="pure-control-group">
<label for="username"><?=addslashes(__("User name"))?></label
><input id="username" name="username" type="text" value="<?=htmlspecialchars($username)?>">
</div>
<?php
if (CONFIG_PASSWORD) {
?>
<div class="pure-control-group">
<label for="userpassword"><?=addslashes(__("Password"))?></label
><input id="userpassword" name="userpassword" type="password">
</div>
<?php
}
if (CONFIG_PIN) {
?>
<div class="pure-control-group">
<label for="pin"><?=addslashes(__("PIN"))?></label
><input id="pin" name="pin" type="text" value="<?=htmlspecialchars($posted_pin)?>">
</div>
<?php
}
?>
</div>
<div class="pure-controls">
<button type="submit" class="pure-button pure-button-primary"><?=addslashes(__("Log in"))?><i class="fa fa-sign-in"></i></button>
</div>
</fieldset>
</form>
<?php
if ($errtext) {
echo("<p>$errtext</p>");
}
if (defined('CONFIG_POLICY')) {
echo('<div class="policy">' . CONFIG_POLICY . '</div>');
}
?>
</div>
</body>
</html>