Refusing users without a mailbox?

Paul van der Vlis paul at
Wed Mar 12 14:28:38 EDT 2008

Patrick Boutilier schreef:
> Paul van der Vlis wrote:
>> Hello,
>> A customer is using a system with a mailserver and a FTP-server on one
>> machine.
>> Now a FTP-user found out, that he can login with his FTP-username and
>> password into the webmail (Horde/IMP), and send mail.
>> FTP-users do not have a mailbox. Is there a way to make the
>> authentication "not OK" for users without a mailbox?
>> Or only "OK" for users who are member of a group?
> You should be able to use pam_require 
> ( Make a group for your 
> mail users and put the users in that group. Then configure 
> /etc/pam.d/imap (or wherever your pam config is located) to use 
> pam_require to require that users that want to log into Cyrus be in that 
> group.

It's a good idea and I can do it. But my distribution (Debian) does not
support this pam-module, so I have no security support.

But I found pam_group, part of libpam-modules. This seems to do what I want.

With regards,
Paul van der Vlis.


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