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PermissionManager.isPermitted(Subject subject, InetAddress ip, Permissions permission, String resource)

New Kafka Classes

Session

• Represents the life of a (TCP) connection
• Container to session specific data. E.g. one or more of the below
  • Username
  • Client IP
  • Certificate
  • Mode of authentication

SessionManager (Singleton)

• This is a singleton object
• This contains the mapping between connections and Session objects
• Facilitates authentication for new connections
• Contains utility methods to retrieve Session object corresponding to the connection

PermissionProvider (Interface)

• Contains the interface methods that needs to be implemented by the authorization provider
• It is assumed that there only one active PermissionProvider. Cascading providers can be supported in the future

DefaultPermissionProvider

• Out of the box implementation of the PermissionProvider
• Stores policies in the properties file or ZooKeeper
• Self contained and no dependencies with any other vendor or providers

PermissionManager (Singleton)

• Helper methods to instantiate the implementation of PermissionProvider
• Proxies all calls to PermissionProvider. E.g. provides helper method for checkPermission
• Enriches context sent to PermissionProvider. E.g. adds session context
• Scalable approach to support multiple providers in the future

Permissions

• Contains the list of permission supported

Subject

• Holds username or other principal

Data Flows

Session Initialization

This flow depicts how the session first created or initialized. Once the session is created, there is a map between the session object and network connection. On subsequent client interaction (socket read/write), the session for the connection is pulled from the map and assigned to the request thread. Then through out the thread, the session is available for any access control.

For client IP authorization, this flow might also call the PermissionProvider to check whether connection from the IP address is allow.

Authorization Flow

This flow is executed during publish/consume or any other request from the client. When the read/write request is received from the client, first it is mapped to the Session object for the connection. This design assumes the session is put in the ThreadLocal or DynamicVariable and is available throughout the scope of the request. When the flow reaches the request handler, e.g. ProducerRequest, the request handler will call the PermissionManager with the topic name (where applicable) and access type (e.g. publish, consume, etc.). The PermissionManager will delegate the check to the provider. Before passing on to the delegate, it will access the session context (user,group, IP, etc) from the session object and pass it on to the PermissionProvider. If the PermissionProvider approves the request, then the flow will continue as usual, however if it is denied, then appropriate error handlers will be called.

Initialize Provider