Botond Hejj commented on ZOOKEEPER-896:

Sorry I was not aware that patches are made against the trunk. It made more 
sense to make against the last release because that is final.
How do you handle situation when the patch is made against an older version of 
trunk than you have checked out?
I will update the patch as soon as I can.

> Improve C client to support dynamic authentication schemes
> ----------------------------------------------------------
>                 Key: ZOOKEEPER-896
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-896
>             Project: Zookeeper
>          Issue Type: Improvement
>          Components: c client
>    Affects Versions: 3.3.1
>            Reporter: Botond Hejj
>            Assignee: Botond Hejj
>             Fix For: 3.4.0
>         Attachments: ZOOKEEPER-896.patch
> When we started exploring zookeeper for our requirements we found the 
> authentication mechanism is not flexible enough.
> We want to use kerberos for authentication but using the current API we ran 
> into a few problems. The idea is that we get a kerberos token on the client 
> side and than send that token to the server with a kerberos scheme. A server 
> side authentication plugin can use that token to authenticate the client and 
> also use the token for authorization.
> We ran into two problems with this approach:
> 1. A different kerberos token is needed for each different server that client 
> can connect to since kerberos uses mutual authentication. That means when the 
> client acquires this kerberos token it has to know which server it connects 
> to and generate the token according to that. The client currently can't 
> generate a token for a specific server. The token stored in the auth_info is 
> used for all the servers.
> 2. The kerberos token might have an expiry time so if the client loses the 
> connection to the server and than it tries to reconnect it should acquire a 
> new token. That is not possible currently since the token is stored in 
> auth_info and reused for every connection.
> The problem can be solved if we allow the client to register a callback for 
> authentication instead a static token. This can be a callback with an 
> argument which passes the current host string. The zookeeper client code 
> could call this callback before it sends the authentication info to the 
> server to get a fresh server specific token.
> This would solve our problem with the kerberos authentication and also could 
> be used for other more dynamic authentication schemes.
> The solution could be generalization also for the java client as well.

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