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https://issues.apache.org/jira/browse/ZOOKEEPER-896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15416951#comment-15416951
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Flavio Junqueira commented on ZOOKEEPER-896:
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As I understand what you're trying to do with this patch, you want to pass a
token based on the specific server address that you get as a parameter in
`getToken`. The test case is not exercising the functionality you saying we
need at all because it is simply incrementing and returning null. As one of the
unit tests for this, this is fine, but I'd rather have one or more slightly
more elaborate test cases showing that passing different tokens per address
works and it does enable the functionality you're after. Is it doable?
> Improve 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, java client
> Reporter: Botond Hejj
> Assignee: Botond Hejj
> Fix For: 3.5.3, 3.6.0
>
> Attachments: NIOServerCnxn.patch, ZOOKEEPER-896.patch,
> ZOOKEEPER-896.patch, ZOOKEEPER-896.patch, ZOOKEEPER-896.patch,
> 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.
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