News: still worry about how to write the correct Casbin policy? Casbin online editor is coming to help! Try it at: http://casbin.org/editor/
Casbin.NET is a powerful and efficient open-source access control library for .NET (C#) projects. It provides support for enforcing authorization based on various access control models.
All the languages supported by Casbin:write-article, read-log. It doesn't control the access to a specific article or log.resource.Owner can be used to get the attribute for a resource./res/*, /res/:id and HTTP methods like GET, POST, PUT, DELETE.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
An example policy for ACL model is like:
p, alice, data1, read
p, bob, data2, write
It means:
We also support multi-line mode by appending '\' in the end:
# Matchers [matchers] m = r.sub == p.sub && r.obj == p.obj \ && r.act == p.act
Further more, if you are using ABAC, you can try operator in like following in Casbin golang edition (jCasbin and Node-Casbin are not supported yet):
# Matchers
[matchers]
m = r.obj == p.obj && r.act == p.act || r.obj in ('data2', 'data3')
But you SHOULD make sure that the length of the array is MORE than 1, otherwise there will cause it to panic.
For more operators, you may take a look at govaluate
What Casbin does:
{subject, object, action} form or a customized form as you defined, both allow and deny authorizations are supported.root or administrator. A superuser can do anything without explict permissions.keyMatch can map a resource key /foo/bar to the pattern /foo*.What Casbin does NOT do:
username and password when a user logs in)dotnet add package Casbin.NET
https://casbin.org/docs/overview
You can also use the online editor (http://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.
https://casbin.org/docs/tutorials
New a Casbin enforcer with a model file and a policy file:
var e = new Enforcer("path/to/model.conf", "path/to/policy.csv")Note: you can also initialize an enforcer with policy in DB instead of file, see Persistence section for details.
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
}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("alice")See Policy management APIs for more usage.
Casbin.UnitTest project for more usage.Casbin provides two sets of APIs to manage permissions:
We also provide a web-based UI for model management and policy management:
https://casbin.org/docs/adapters
Policy consistence between multiple nodeshttps://casbin.org/docs/watchers
https://casbin.org/docs/role-managers
https://casbin.org/docs/benchmark
Authz middlewares for web frameworks: https://casbin.org/docs/middlewares
https://casbin.org/docs/adopters
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This project is licensed under the Apache 2.0 license.
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