README

Attribute-Based Access Control implementation library

Introduction

This library is meant to implement the concept of ABAC in your PHP applications.

The concept is to manage access control using attributes : from users, from resources and environment.

It allows us to define rules based on the properties of the user object and optionally the accessed object.

These rules will be checked in your application to determine if an user is allowed to perform an action.

The following links explain what ABAC is :

• ABAC Introduction
• NIST specification

Installation

Using composer :

composer require craftcamp/php-abac

Then you will have to configure the attributes and the rules of your application.

For more details about this, please refer to the dedicated documentation

Documentation

• Configuration
• Dependency Injection
• Access-control
• Comparisons
• Caching

Usage Examples

Example with only user attributes defined in the rule

We have in this example a single object, representing the current user.

This object have properties, with getter methods to access the values.

For example, we can code :

<?php use PhpAbac\AbacFactory; class User{ protected $id; protected $isBanned; public function getId() { return $this->id; } public function setIsBanned($isBanned) { $this->isBanned = $isBanned; return $this; } public function getIsBanned() { return $this->isBanned; } } $user = new User(); $user->setIsBanned(true); $abac = AbacFactory::getAbac([ 'policy_rule_configuration.yml' ]); $abac->enforce('create-group', $user);

The attributes checked by the rule can be :

Example with both user and object attributes

use PhpAbac\AbacFactory; $abac = AbacFactory::getAbac([ 'policy_rule_configuration.yml' ]); $check = $abac->enforce('read-public-group', $user, $group);

The checked attributes can be :

Example with dynamic attributes

<?php use PhpAbac\AbacFactory; $abac = AbacFactory::getAbac([ 'policy_rule_configuration.yml' ]); $check = $abac->enforce('edit-group', $user, $group, [ 'dynamic-attributes' => [ 'group-owner' => $user->getId() ] ]);

Example with referenced attributes

The configuration shall be :

attributes: group: class: MyApp\Model\Group type: resource fields: author.id: name: Author ID app_user: class: MyApp\Model\User type: user fields: id: name: User ID rules: remove-group: attributes: app_user.id: comparison: object comparison_type: isFieldEqual value: group.author.id

And then the code :

<?php use PhpAbac\AbacFactory; $abac = AbacFactory::getAbac([ 'policy_rule_configuration.yml' ]); $check = $abac->enforce('remove-group', $user, $group);

Example with cache

$check = $abac->enforce('edit-group', $user, $group, [ 'cache_result' => true, 'cache_ttl' => 3600, // Time To Live in seconds 'cache_driver' => 'memory' // memory is the default driver, you can avoid this option ]);

Example with multiple rules (ruleSet) for an unique rule. Each rule are tested and the treatment stop when the first rule of the ruleSet allow access

The configuration shall be (alcoolaw.yml):

attributes: main_user: class: PhpAbac\Example\User type: user fields: age: name: Age country: name: Code ISO du pays rules: alcoollaw: - attributes: main_user.age: comparison_type: numeric comparison: isGreaterThan value: 18 main_user.country: comparison_type: string comparison: isEqual value: FR - attributes: main_user.age: comparison_type: numeric comparison: isGreaterThan value: 21 main_user.country: comparison_type: string comparison: isNotEqual value: FR 

And then the code :

<?php use PhpAbac\AbacFactory; $abac = AbacFactory::getAbac([ 'alcoollaw.yml' ]); $check = $abac->enforce('alcoollaw', $user);

Example with rules root directory passed to Abac class. This feature allow to give a policy definition rules directory path directly to the Abac class without adding to all files :

Considering we have 3 yaml files :

• rest/conf/policy/user_def.yml
• rest/conf/policy/gunlaw.yml

The php code can be :

<?php use PhpAbac\AbacFactory; $abac = AbacFactory::getAbac([ 'user_def.yml', 'gunlaw.yml', ],[],'rest/conf/policy/'); $check = $abac->enforce('gunlaw', $user); 

Contribute

If you want to contribute, don't hesitate to fork the library and submit Pull Requests.

You can also report issues, suggest enhancements, feel free to give advices and your feedback about this library.

It's not finished yet, there's still a lot of features to implement to make it better. If you want to be a part of this library improvement, let us know !

See also

• Symfony bundle to support this library