[Dovecot] Initial support for shared mailboxes

[Timo Sirainen]

On Sep 30, 2008, at 6:08 PM, Sascha Wilde wrote:

>>> Is there a %%h, too?  So that, if we have
>>>
>>>  mail_location = maildir:~
>> ..
>>> Another (more specific) problem in this context: Is is it possible  
>>> to
>>> determine a users home calling an external program like  
>>> checkpassword?
>>> This would be needed in an setup, where the users $HOME is set by an
>>> checkpassword program to an compute value, to access another users
>>> mailbox.
>>
>> This would require doing a userdb lookup from dovecot-auth the same  
>> way
>> as deliver or expire-tool does it.
>
> I'm not quite sure what you mean by "this" here, are you referring to
> the proposed `%%h' variable, too or only to my more specific problem
> with computer HOME paths?

I think it's the same thing.

>> So sure it'd be possible, but I'm not
>> really interested in implementing it yet. I think expire-tool is
>> currently using copy&pasted code from deliver, those could be merged
>> into some library function and then the namespace code could easily  
>> use
>> the same function.
>
> But is deliver currently able to utilize an external program to
> get user data?

deliver will do the userdb lookup from dovecot-auth, which in turn can  
use the external program.

> So I guess what is needed is a new userdb backend which is explicitly
> runs an arbitrary external program to get the user data (instead of
> caching the passdb results).

Right. Perhaps the passdb checkpassword code could be used as userdb  
too, just with an added extra variable specifying if it's a passdb or  
a userdb lookup. Or maybe instead of sending "user \0 pass \0" it'd  
just send "user". I'm not really sure. In any case I think the reply  
should be handled somewhat differently so that the checkpassword can't  
accidentally think it's doing a userdb lookup while it's really doing  
a passdb lookup and return success.
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