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cloudflare/authr
================

a flexible, expressive, language-agnostic access-control framework

v3.0.1(5y ago)52108.6k↓31.9%7[2 issues](https://github.com/cloudflare/authr/issues)[5 PRs](https://github.com/cloudflare/authr/pulls)PHPCI passing

Since Mar 13Pushed 1y ago6 watchersCompare

[ Source](https://github.com/cloudflare/authr)[ Packagist](https://packagist.org/packages/cloudflare/authr)[ RSS](/packages/cloudflare-authr/feed)WikiDiscussions main Synced 1mo ago

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authr
=====

[](#authr)

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a flexible, expressive, language-agnostic access-control framework.

how it works
------------

[](#how-it-works)

*authr* is an access-control framework. describing it as a "framework" is intentional because out of the box it is not going to automatically start securing your application. it is *extremely* agnostic about quite a few things. it represents building blocks that can be orchestrated and put together in order to underpin an access-control system. by being so fundamental, it can fit almost any need when it comes to controlling access to specific resources in a particular system.

### vocabulary

[](#vocabulary)

the framework itself has similar vocabulary to an [ABAC](https://en.wikipedia.org/wiki/Attribute-based_access_control) access-control system. the key terms are explained below.

#### subject

[](#subject)

a *subject* in this framework represents an entity that is capable of performing actions; an *actor* if you will. in most cases this will represent a "user" or an "admin".

#### resource

[](#resource)

a *resource* represents an entity which can be acted upon. in a blogging application this might be a "post" or a "comment". those are things which can be acted upon by subjects wanting to "edit" them or "delete" them. it *is* worth noting that subjects can also be resources — a "user" is something that can act and be acted upon.

a *resource* has **attributes** which can be analyzed by authr. for example, a `post` might have an attribute `id` which is `333`. or, a user might have an attribute `email` which would be `person@awesome.blog`.

#### action

[](#action)

an *action* is a simple, terse description of what action is being attempted. if say a "user" was attempting to fix a typo in their "post", the *action* might just be `edit`.

#### rule

[](#rule)

a rule is a statement that composes conditions on resource and actions and specifies whether to allow or deny the attempt if the rule is matched. so, for example if you wanted to "allow" a subject to edit a private post, the JSON representation of the rule might look like this:

```
{
  "access": "allow",
  "where": {
    "action": "edit",
    "rsrc_type": "post",
    "rsrc_match": [["@type", "=", "private"]]
  }
}
```

notice the lack of anything that specifies conditions on *who* is actually performing the action. this is important; more on that in a second.

### agnosticism through interfaces

[](#agnosticism-through-interfaces)

across implementations, *authr* requires that objects implement certain functionality so that its engine can properly analyze resources against a list of rules that *belong* to a subject.

once the essential objects in an application have implemented these interfaces, the essential question can finally be asked: **can this subject perform this action on this resource?**

```