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Description:

casbin

dart-casbin #
An authorization library that supports access control models like ACL, RBAC, ABAC in Dart.

News: Are you still worried about how to write the correct Casbin policy? Casbin online editor is coming to help! Try it at: http://casbin.org/editor/

All the languages supported by Casbin: #

Casbin
jCasbin
node-Casbin
PHP-Casbin

production-ready
production-ready
production-ready
production-ready

PyCasbin
Casbin.NET
Casbin-CPP
Casbin-RS

production-ready
production-ready
beta-test
production-ready

Supported models #

ACL (Access Control List)
ACL with superuser
ACL without users: especially useful for systems that don't have authentication or user log-ins.
ACL without resources: some scenarios may target for a type of resources instead of an individual resource by using permissions like write-article, read-log. It doesn't control the access to a specific article or log.
RBAC (Role-Based Access Control)
RBAC with resource roles: both users and resources can have roles (or groups) at the same time.
RBAC with domains/tenants: users can have different role sets for different domains/tenants.
ABAC (Attribute-Based Access Control): syntax sugar like resource.Owner can be used to get the attribute for a resource.
RESTful: supports paths like /res/*, /res/:id and HTTP methods like GET, POST, PUT, DELETE.
Deny-override: both allow and deny authorizations are supported, deny overrides the allow.
Priority: the policy rules can be prioritized like firewall rules.

How it works? #
In Casbin, an access control model is abstracted into a CONF file based on the PERM metamodel (Policy, Effect, Request, Matchers). So switching or upgrading the authorization mechanism for a project is just as simple as modifying a configuration. You can customize your own access control model by combining the available models. For example, you can get RBAC roles and ABAC attributes together inside one model and share one set of policy rules.
The most basic and simplest model in Casbin is ACL. ACL's model CONF is:
# Request definition
[request_definition]
r = sub, obj, act

# Policy definition
[policy_definition]
p = sub, obj, act

# Policy effect
[policy_effect]
e = some(where (p.eft == allow))

# Matchers
[matchers]
m = r.sub == p.sub && r.obj == p.obj && r.act == p.act

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An example policy for ACL model is like:
p, alice, data1, read
p, bob, data2, write
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It means:

alice can read data1
bob can write data2

Features #
What Casbin does:

enforce the policy in the classic {subject, object, action} form or a customized form as you defined, both allow and deny authorizations are supported.
handle the storage of the access control model and its policy.
manage the role-user mappings and role-role mappings (aka role hierarchy in RBAC).
support built-in superuser like root or administrator. A superuser can do anything without explict permissions.
multiple built-in operators to support the rule matching. For example, keyMatch can map a resource key /foo/bar to the pattern /foo*.

What Casbin does NOT do:

authentication (aka verify username and password when a user logs in)
manage the list of users or roles. I believe it's more convenient for the project itself to manage these entities. Users usually have their passwords, and Casbin is not designed as a password container. However, Casbin stores the user-role mapping for the RBAC scenario.

Documentation #
https://casbin.org/docs/en/overview
Online editor #
You can also use the online editor (https://casbin.org/editor/) to write your Casbin model and policy in your web browser. It provides functionality such as syntax highlighting and code completion, just like an IDE for a programming language.
Tutorials #
https://casbin.org/docs/en/tutorials
Get started #

New a Casbin enforcer with a model file and a policy file:
var e = Enforcer.fromModelPathAndPolicyFile('path/to/model.conf', 'path/to/policy.csv');
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Add an enforcement hook into your code right before the access happens:
var sub = 'alice'; // the user that wants to access a resource.
var obj = 'data1'; // the resource that is going to be accessed.
var act = 'read'; // the operation that the user performs on the resource.

if (e.enforce([sub, obj, act])){
// permit alice to read data1
} else {
// deny the request, show an error
}
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Besides the static policy file, Casbin also provides API for permission management at run-time. For example, You can get all the roles assigned to a user as below:
var roles = e.getRolesForUser(sub);
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See Policy management APIs for more usage.
Policy management #
Casbin provides two sets of APIs to manage permissions:

Management API: the primitive API that provides full support for Casbin policy management.
RBAC API: a more friendly API for RBAC. This API is a subset of Management API. The RBAC users could use this API to simplify the code.

We also provide a web-based UI for model management and policy management:

Policy persistence #
https://casbin.org/docs/en/adapters
Policy consistence between multiple nodes #
https://casbin.org/docs/en/watchers
Role manager #
https://casbin.org/docs/en/role-managers
Examples #

Model
Model file
Policy file

ACL
basic_model.conf
basic_policy.csv

ACL with superuser
basic_model_with_root.conf
basic_policy.csv

ACL without users
basic_model_without_users.conf
basic_policy_without_users.csv

ACL without resources
basic_model_without_resources.conf
basic_policy_without_resources.csv

RBAC
rbac_model.conf
rbac_policy.csv

RBAC with resource roles
rbac_model_with_resource_roles.conf
rbac_policy_with_resource_roles.csv

RBAC with domains/tenants
rbac_model_with_domains.conf
rbac_policy_with_domains.csv

ABAC
abac_model.conf
N/A

RESTful
keymatch_model.conf
keymatch_policy.csv

Deny-override
rbac_model_with_deny.conf
rbac_policy_with_deny.csv

Priority
priority_model.conf
priority_policy.csv

Middlewares #
Authz middlewares for web frameworks: https://casbin.org/docs/en/middlewares
Our adopters #
https://casbin.org/docs/en/adopters
How to Contribute #
Please read the contributing guide.
Backers #
Thank you to all our backers! 🙏 [Become a backer]

Sponsors #
Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [Become a sponsor]

License #
This project is licensed under the Apache 2.0 license.
Contact #
If you have any issues or feature requests, please contact us. PR is welcomed.

https://github.com/casbin/dart-casbin/issues
hsluoyz@gmail.com
Tencent QQ group: 546057381