Firewall

This PHP 5.4+ library provides IP filtering features.
A lot of filters can be used.
It is also possible to customize the error handling.

Installation

Add this line in your composer.json :

{
    "require": {
        "m6web/firewall": "dev-master"
    }
}

Update your vendors :

$ composer update m6web/firewall

Usage

Basic usage

use M6Web\Component\Firewall\Firewall;

$whiteList = array(
    '127.0.0.1',
    '192.168.0.*',
);

$blackList = array(
    '192.168.0.50',
);

$firewall = new Firewall();

$connAllowed = $firewall
    ->setDefaultState(false)
    ->addList($whiteList, 'local', true)
    ->addList($blackList, 'localBad', false)
    ->setIpAddress('195.88.195.146')
    ->handle()
;

if (!$connAllowed) {
    http_response_code(403); // Forbidden
    exit();
}

In this example, only IPs starting with 192.168.0 (but not 192.168.0.50) and 127.0.0.1 will be allowed by the firewall.
In all other case handle() return false.

• setDefaultState(false) defines default firewall response (Optional - Default false),
• addList($whiteList, 'local', true) defines $whiteList list, called local as allowed (true),
• addList($blackList, 'localBad', false); defines $blackList list, called localBad as rejected (false).

Entries Formats

Type	Syntax	Details
IPV6	::1	Short notation
IPV4	192.168.0.1
Range	192.168.0.0-192.168.1.60	Includes all IPs from 192.168.0.0 to 192.168.0.255 and from 192.168.1.0 to 198.168.1.60
Wild card	192.168.0.*	IPs starting with 192.168.0 Same as IP Range 192.168.0.0-192.168.0.255
Subnet mask	192.168.0.0/255.255.255.0	IPs starting with 192.168.0 Same as 192.168.0.0-192.168.0.255 and 192.168.0.*
CIDR Mask	192.168.0.0/24	IPs starting with 192.168.0 Same as 192.168.0.0-192.168.0.255 and 192.168.0.* and 192.168.0.0/255.255.255.0

Custom error handling

use M6Web\Component\Firewall\Firewall;

function handleFirewallReturn(Firewall $firewall, $response) {
    if (false === $response) {
        header($_SERVER["SERVER_PROTOCOL"]." 403 Forbiden");
        exit();
    }

    return $response;
}

$whiteList = array(
    '127.0.0.1',
    '198.168.0.*',
);

$blackList = array(
    '192.168.0.50',
);

$firewall = new Firewall();
$firewall
    ->setDefaultState(true)
    ->addList($whiteList, 'local', true)
    ->addList($blackList, 'localBad', false)
    ->setIpAddress('195.88.195.146')
    ->handle('handleFirewallReturn')
;

handle('handleFirewallReturn') calls handleFirewallReturn with Firewall object and response as arguments (true or false).

Running the tests

$ php composer.phar install --dev
$ ./vendor/bin/atoum -d Tests

Credits

Developped by the Cytron Team of M6 Web.
Tested with atoum.

License

Firewall is licensed under the MIT license.