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From "Quintin Beukes (JIRA)" <>
Subject [jira] Updated: (GERONIMO-4848) Application Client Login Retries
Date Fri, 04 Sep 2009 19:49:00 GMT


Quintin Beukes updated GERONIMO-4848:

    Attachment: login-retries.patch

Patch as described in the issue's description as well as the full class to read the code without
having to patch an older version.

> Application Client Login Retries
> --------------------------------
>                 Key: GERONIMO-4848
>                 URL:
>             Project: Geronimo
>          Issue Type: New Feature
>      Security Level: public(Regular issues) 
>          Components: application client, security
>    Affects Versions: 2.1.4
>            Reporter: Quintin Beukes
>            Priority: Minor
>         Attachments: login-retries.patch,
> When an application client is configured to authenticate with a JAAS realm and a CallbackHandler,
the login is performed before the application's main method is called, thus outside the context
of the client application itself.
> This all works, except a failed login isn't retried and there is no way for the application
to even detect this (nor a cancel if such an option existed).
> The attached patch is a modification of org.apache.geronimo.openejb.OpenejbRemoteLoginModule.
> - It introduces a login retry facility. It does so by supplying an optional extra "option",
which can be specified in the gbean configuration, like so:
> ...
>         <lc:login-module control-flag="REQUIRED">
>           <lc:login-domain-name>remote-openejb-realm</lc:login-domain-name>
>           <lc:login-module-class></lc:login-module-class>
>           <lc:option name="RemoteSecurityRealm">KMSRealm</lc:option>
>           <lc:option name="ServerURI">ejbd://localhost:4201</lc:option>
>           <lc:option name="FailedLoginTries">3</lc:option>
>         </lc:login-module>
> ...
> - If you omit this option, it will default to the current behaviour of "1" try.
> - If you specify an integer great or equal to 0, it will perform the given amount of
tries. If no successful authentication occurred during these tries it will fail with the FailedLoginException
(as it does currently).
> - If you specify 0 login tries, then it will keep trying until either a successful authentication
or the user cancelled. The cancel is detected by setting either the NameCallback or PasswordCallback's
value to null. This is quite unintuitive and might make it more difficult to find bugs in
your code where the values are unintentionally null, so an alternative way might be better.

> Note: The "cancel" check works for all logins, including the first try. 
> - Further, if a "cancel" is detected, the callback handler is invoked with a single TextOutputCallback
which contains an INFORMATION type message "Login cancelled by user.".
> - If authentication failed, the callback handler is invoked with a single TextOutputCallback
which contains an ERROR type message "Login failed for user: ${USER}", where USER is the username
of the last NameCallback.
> The justification of implementing this in the LoginModule and not the application client
is to have more direct access to the CallbackHandler, so as to send the "Login Failed" and
"Login canceled" messages. Also the fact that certain types of login modules might be used
which don't support the "concept" of a retry, like host based authentication modules. So doing
retries in the application client layer didn't seem logical. This way you can also extend
the class or build your own and ship it with your application, and so be able to customize
the retry behaviour, instead of relying on a fixed retry strategy in the application client
layer (which could only be changed by recompiling the plugin).
> Any suggestions/requests, just let me know and I'll implement them.

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