Transform reject to accept response with specific attributes

[Kostas Zorbadelos]

Greetings to all,

I would like to achieve the following functionality: in case a user's
AUTHENTICATION fails, the user should not be rejected but be given an
accept response with specific attributes.
The reason behind this is to provide a captive portal functionality for
users having wrong credentials in their CPEs. 
Could you provide a few hints for how the config would look like (I am
thinking of something in terms of unlang and utilizing virtual servers
but I am not sure how it would look like. 

Regards,

Kostas

-- 
Kostas Zorbadelos		
twitter:@kzorbadelos		http://gr.linkedin.com/in/kzorba 
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