[Dovecot] Dovecot handling of over quota messages

[Steffen Kaiser]

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On Mon, 26 Jan 2009, Andrzej Adam Filip wrote:

>> Wasn't the socket map also (mainly?) used for verifying if a user
>> exists? That I have been planning on implementing some day (for last 5
>> years or so).
>
> AFAIR Socket map was originally intended to allow "stable sendmail code"
> integration of  "multitude" of databases (mysql,oracle,postgress,...).

Which is running pretty well. I'm running my virtuser and Aliases with a 
socket map server querying (and caching) LDAP and Postgres databases and 
mangle our myriads of domain aliases.

> It may be used to:
> 1a) ask mailbox server with virtual domain (e.g. dovecot) which domain it
>    wants/handles at sendmail daemon startup
> 1b) reject messages to overquota mailboxes in reply to "RCPT TO:" (4??/5???)
>    [Cyrus IMAP does not try to detect "this message" will cross quota]

At this point I made no success. The problem I encountered is that with 
aliases and forwards I don't know the point when to return the failure, 
meaning "there could a another user resolution step to forward the mail 
along". E.g. ".forward" files come last, out of reach of the socket map 
server.

> 1c) implement aliases
>    It should allow "per virtual domain" email administrators
>    implemented in dovecot.
> 1d) allow users to specify "at 'RCPT TO:'" sieve scripts

?? Huh, Sieve scripts at RCPT TO phase?

> After modification of sendmail source code socket map may be used to
> pass to sendmail information about virtual users (uid,gid,$HOME).

> It should allow:
> 2a) supporting .forward files *for virtual users* (e.g. ~/.forward.user)

You mean by to extend the map-scheme to getpwnam() ?

> 2b) making sendmail execute deliver program with uid and gid of virtual
>    user
> ---------------------------------------------------------------------
> Consider also implementing support for (simple) saslauth protocol
> together with socket map => it will allow sendmail (without dovecot sasl
> support) to use/check passwords stored by dovecot in SMTP AUTH.

Dunno, but there is already a simple saslauth protocol sendmail can use:

IN  <len>username<len>password<len>service<len>realm
OUT <len>code

code:
OK [reason]
NO [reason]

Googling for it I found a comment about its history:
http://www.opensource.apple.com/darwinsource/10.3/passwordserver_sasl-14/cyrus_sasl/saslauthd/saslauthd.c

But as you already pointed out, one needs a getpw*(), too.

Bye,

- -- 
Steffen Kaiser
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