Hej.

Założenie jest aby nie używać baz danych.

Funkcjonalności:
* Logowanie jako użytkownik + hasło lub samo hasło
* Max. próba logowań (bazowano na IP logującego)
* Prostota? (do waszej oceny)
* Bezpieczeństwo? (do waszej oceny)
*


Dzięki!

PS: Tak, styl forma jest zerżnięty z Githuba, proszę już mnie za to nie karcić.

edit: dodałem komentarze

Usage

[PHP] pobierz, plaintext 
<?
require_once('authPage.php');
 
echo 'Logged in!';	
?>
[PHP] pobierz, plaintext 

authPage.php

[PHP] pobierz, plaintext 
<?
/*
 
Config BEGIN
 
username => password
username should contain alphameric chars only
 
*/
 
$DATA = array(
  'admin' => 'password',
  'user' => 'qwert123',
);
 
 
define('USERNAMES', true);		// Choose between using Username or Username + Password auth (true/false)
define('TIMEOUT', 30); 			// How long user should stay logged in (set 0 for unlimited time) [in minutes]
define('BANTIME', 15); 			// How long should IP ban after X fail login attempts last [in minutes]
define('MAX_ATTEMPTS', 5); 		// Max. number of fail login attempts (int > 0)
 
 
/*
 
Cofnig END
Do NOT edit code below (unless you know what you are doing)
 
*/ 
 
ob_start( );
session_start( );
 
 
$Timeout = TIMEOUT == 0 ? pow(999, 3) : TIMEOUT * 60;
$Bantime = BANTIME * 60;
$RemoteIP = $_SERVER['REMOTE_ADDR'];
 
// Retrieve file name
$FilePath = $_SERVER['SCRIPT_NAME'];
$Break = Explode('/', $FilePath);
$File = $Break[count($Break) - 1]; 
 
if( isset($_GET['logout']) ) {
 
	$_SESSION['SLS_LOGGED'] = false;
 
	header( 'Location: ' . $File );
 
	die( );
 
}
 
// Check if max fail login attempts is 1 or greater
if( MAX_ATTEMPTS < 1 )
	die('Max attempts must be 1 or grater!');
 
// Form submit
if ( isset($_POST['commit']) )
{
 
	$Login = USERNAMES ? strtolower(trim($_POST['access_login'])) : '';
	$Password = $_POST['access_password'];
 
	$LeftAttempts = 0;
 
	// Load ban XML
	$DOM = new DOMDocument();
	$DOM->load('authPage.xml');		
	$Attempts = $DOM->getElementsByTagName('attempt');
	$Found = false;
	$FoundAttempt = NULL;
 
 
	foreach( $Attempts as $Attempt )
	{
		// Check if IP already exists in XML [ref 01]
		if( $Attempt->getElementsByTagName('Remoteip')->item(0)->getAttribute('val') == $RemoteIP );
		{
			$Found = true;
			$FoundAttempt = $Attempt;
 
			// Check if IP is already banned
			if ( $FoundAttempt->getElementsByTagName('Banned')->item(0)->getAttribute('val') == '1' )
			{
 
				// Check if bantime already passed
				$TimePassed = time( ) - $FoundAttempt->getElementsByTagName('Timestamp')->item(0)->getAttribute('val');
 
				if ( $TimePassed > $Bantime )
				{
					// It did, therefore remove the ban and continue executing
					removeBans($FoundAttempt);
				}
				else
				{
					// It didn't, show Login form with banned message and terminate
					showLoginPasswordProtect('Banned.');
					die( );
				}
			}
		}
	}
 
	// If IP wasn't found in XML, create an entry and store first login attempt	[ref 02]
	if( !$Found )
	{
		$_MainNode = $DOM->createElement('attempt');
		$DOM->getElementsByTagName('attempts')->item(0)->appendChild($_MainNode);
 
		$_Remoteip = $_MainNode->appendChild( $DOM->createElement( 'Remoteip' ) );	
		$_Remoteip->setAttribute('val', $RemoteIP);
 
		$_Attempts = $_MainNode->appendChild( $DOM->createElement( 'Attempts' ) );	
		$_Attempts->setAttribute('val', '1');
 
		$_Banned = $_MainNode->appendChild( $DOM->createElement( 'Banned' ) );	
		$_Banned->setAttribute('val', '0');
 
		$_Timestamp = $_MainNode->appendChild( $DOM->createElement( 'Timestamp' ) );	
		$_Timestamp->setAttribute('val', '0');
 
		$LeftAttempts = MAX_ATTEMPTS - 1;
 
		$DOM->save('authPage.xml');
	}
 
	// Login FAILED  
	if ( !USERNAMES && !in_array($Password, $DATA) || ( USERNAMES && ( !array_key_exists(strtolower(trim($Login)), $DATA) || $DATA[strtolower(trim($Login))] != $Password ) ) )
	{		
		// IP has been previously found [ref 01]
		if ( $Found )
		{	
 
			$AttempsCount = $FoundAttempt->getElementsByTagName('Attempts')->item(0)->getAttribute('val'); // Retrieve number of attempts
			$AttempsCount++; // Increase attempts count by one
 
			// Check if number of attempts matches (or exceeds -- possible?) max number of fail login attempts...					
			if( $AttempsCount < MAX_ATTEMPTS )
			{
				$LeftAttempts = MAX_ATTEMPTS - $AttempsCount; // Var to display left no of attempts
 
				$FoundAttempt->getElementsByTagName('Attempts')->item(0)->removeAttribute('val');	
				$FoundAttempt->getElementsByTagName('Attempts')->item(0)->setAttribute('val', $AttempsCount); // Change attempts no
 
				showLoginPasswordProtect('Incorrect Login and/or Password. ' . $LeftAttempts . ' attempt(s) left' );
			}
			// If so, ban IP address
			else
			{
				$FoundAttempt->getElementsByTagName('Banned')->item(0)->removeAttribute('val');
				$FoundAttempt->getElementsByTagName('Banned')->item(0)->setAttribute('val', '1'); // Ban
 
				$FoundAttempt->getElementsByTagName('Timestamp')->item(0)->removeAttribute('val');
				$FoundAttempt->getElementsByTagName('Timestamp')->item(0)->setAttribute('val', time()); // Timestamp when banned
 
				showLoginPasswordProtect('Banned.');
			}
 
			$DOM->save('authPage.xml');				
 
		}
		// Display login form (ip not found) [ref 02]
		else
			showLoginPasswordProtect('Incorrect Login and/or Password. ' . $LeftAttempts . ' attempt(s) left' );
 
		die( ); // Terminate after fail login attempt
 
	}
	// Login success
	else 
	{
 
		removeBans($FoundAttempt); // Remove bancount/ban (if any)
		$DOM->save('authPage.xml');	
 
		$_SESSION['SLS_LOGGED'] = true; // Logged in
		$_SESSION['SLS_TIMEOUT'] = time( ) + $Timeout; // Timeout
 
		unset($_POST); // Browser keep the post data anyway *dang*
 
		header( 'Location: ' . $File ); // But we will force it to drop them!
 
		die( ); // Always secured
 
	}
 
}
// No form has been submitted
else
{
	// Check if session expired.
	if( isset($_SESSION['SLS_TIMEOUT']) && time( ) > $_SESSION['SLS_TIMEOUT'] )
	{
		$_SESSION['SLS_LOGGED'] = false;
 
		showLoginPasswordProtect('Session expired.');
 
		die( );
	}
 
	// Check if logged in
	if( !$_SESSION['SLS_LOGGED'] )
	{
    	showLoginPasswordProtect('');
 
		die( );	
	}
 
	// If logged in, keep session alive
	$_SESSION['SLS_TIMEOUT'] = time( ) + $Timeout;
 
}
 
// Display login form
function showLoginPasswordProtect($error) 
{
 
?>
	<html lang="en">
	<head>
 
            <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
            <title>Login Panel</title>
			<link href="authPage.css" type="text/css" rel="stylesheet"/>
 
	</head>
 
	<body>
 
    <div class="login_form" id="login">
 
        <!-- Login form template `borrowed` from Github.com -->
 
        <form method="post" action="<? print $GLOBALS['File'] ?>">
 
			<h1>Log in</h1>
 
			<div class="formbody">
 
			<?
 
				if( !empty($error) )
					print '<div class="error_box">' . $error . '</div>';
 
				if ( USERNAMES )
				{
 
			?>		
 
				<label for="login_field">
 
					Login<br />
 
					<input type="text" tabindex="1" style="width: 21em;" name="access_login" id="login_field" class="text" autocapitalize="off">
 
		        </label>
 
			<?
 
				}
 
			?>
 
				<label for="password">
 
					Password<br />
 
					<input type="password" value="" tabindex="2" style="width: 21em;" name="access_password" id="password" class="text" autocomplete="disabled">
 
				</label>
 
				<label class="submit_btn">
 
					<input type="submit" value="Log in" tabindex="3" name="commit">
 
				</label>
 
			</div>
 
		</form>
 
	</div>
 
</body>
 
</html>
 
<?
 
}
 
// Remove bans function
function removeBans($input) 
{
	$input->getElementsByTagName('Attempts')->item(0)->removeAttribute('val');
	$input->getElementsByTagName('Attempts')->item(0)->setAttribute('val', '0');
 
	$input->getElementsByTagName('Banned')->item(0)->removeAttribute('val');
	$input->getElementsByTagName('Banned')->item(0)->setAttribute('val', '0');	
 
	$input->getElementsByTagName('Timestamp')->item(0)->removeAttribute('val');
	$input->getElementsByTagName('Timestamp')->item(0)->setAttribute('val', '0');	
}
 
ob_end_flush();
?>
[PHP] pobierz, plaintext 

authPage.xml

[XML] pobierz, plaintext 
<?xml version="1.0" encoding="utf-8"?>
<attempts></attempts>
[XML] pobierz, plaintext 

authPage.css
http://ideone.com/ZtPJl (nie zmieściło się do posta + mało istotne)


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