limit user to a dedicated service?

Hi List,

I am searching for a solution to limit a user to a dedicated service.
the Idea behind is to have a connection manager where I can sort out
src_IPs and services. But I only want to allow very limited users from
the 'untrusted cloud' behind the cman.

If there is nothing prepared from Oracle for such an demand, I just
will create a logon trigger. But first I have to ask - not to reinvent
the weel.

cman => 11.2.0.2 @ Solaris
rdbms/listener/crs => 11.2.0.1 @ linux 64bit

thanks
 Martin
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