Asynchronous notification to enable user space to accept or deny authentication for SASL EXTERNAL profile, and passes a user defined pointer.
Functions using this handler are:
|connection ||The connection where the request was received. |
|authorization_id ||The authorization id to authenticate. |
|user_data ||The user defined pointer to be passed to future SASL callbacks|
- axl_true to authenticate and allow request received or axl_false to deny it.