casbin / caddy-authz

Caddy-authz is a middleware for Caddy that blocks or allows requests based on access control policies.

Caddy-authz

Caddy-authz is an authorization middleware for Caddy, it's based on https://github.com/casbin/casbin.

Installation

go get github.com/casbin/caddy-authz

Caddyfile syntax

localhost {
    route { 
        authz "/folder/to/caddy_binary/authz_model.conf" "/folder/to/caddy_binary/authz_policy.csv"
    }
    respond "Hello, world!"
    ...
}

or

{
    order authz before respond
}

localhost {
	authz "/folder/to/caddy_binary/authz_model.conf" "/folder/to/caddy_binary/authz_policy.csv"
	respond "Hello, world!"
    ...
}

The authz directive specifies the path to Casbin model file (.conf) and Casbin policy file (.csv). The Casbin model file describes access control models like ACL, RBAC, ABAC, etc. The Casbin policy file describes the authorization policy rules. For how to write these files, please refer to: https://github.com/casbin/casbin#get-started

A working example

1. cd into the folder of caddy binary.

2. Put your Casbin model file authz_model.conf and Casbin policy file authz_policy.csv into this folder.

3. Add authz directive to your Caddyfile like:

localhost:666 {
    route { 
        authz "authz_model.conf" "authz_policy.csv"
    }
    respond "Hello, world!"
    ...
}

4. Run caddy and enjoy.

Note: This plugin only supports HTTP basic authentication to get the logged-in user name, if you use other kinds of authentication like OAuth, LDAP, etc, you may need to customize this plugin.

How to control the access

The authorization determines a request based on {subject, object, action}, which means what subject can perform what action on what object. In this plugin, the meanings are:

1. subject: the logged-on user name
2. object: the URL path for the web resource like "dataset1/item1"
3. action: HTTP method like GET, POST, PUT, DELETE, or the high-level actions you defined like "read-file", "write-blog"

For how to write authorization policy and other details, please refer to the Casbin's documentation.

Getting Help

• Casbin

License

This project is under Apache 2.0 License. See the LICENSE file for the full license text.