exim & lmtp mechs

[Ken Murchison]

TN wrote:

> I've been trying to crack this problem for over a month, between the 
> exim & cyrus lists. Sometimes I think its a exim issue, sometimes cyrus. 
> I'm back onto cyrus :)
> 
> 
> I've posted a lengthy explanation of what I am doing here:
> 
> http://groups.yahoo.com/group/exim-users/message/62558
> 
> but the short version is:
> 
> I have cyrus & exim on the same local server. I am using ldap 
> authentication (saslauths -a ldap), with virtual domains and the ldap 
> authentication is working fine - I can send & receive emails into my 
> ldap users. I am delivering mail from exim to cyus using smtp/lmtp - 
> preauthed using "lmtpd -a" in cyrus.conf
> My little problem is that I am trying to use exim's authenticated_sender 
> to bypass the requirement of using anyone post acl's in cyrus so I can 
> post to suffixes. I can't get it to work - because exim doesn't attach 
> the AUTH= param onto the dialog it does with lmtp (verified by debug in 
> exim). It appears that this is because I don't have any auth mechanisms 
> on offer in the lmtp delivery (I am using lmtpd pre-auth "lmtpd -a"), so 
> my questions are:
> how do I get lmtp to offer mechs to exim ?
> Why doesn't pre-auth work ?
> I've always assumed that lmtp would be going via saslauthd, which in 
> turn was authing via ldap - but this migth be wrong ?
> 
> I've noticed with pre-auth that ltmp says AUTH EXTERNAL as a mech, but 
> exim just ignores this it seems, and doesn't attach an AUTH= parameter 
> at all onto the MAIL cmd.

I'm not an Exim expert (in fact, I've never used it), but from reading 
Philip's post, it appears that Exim will not pass AUTH= unless it has 
authenticated to lmtpd (although RFC 2554 states that this is not 
required).  By pre-authing lmtpd (lmtpd -a), you're preventing Exim from 
authenticating, unless you can find a way to tell Exim that it can use 
the EXTERNAL mechanism.  My guess is that if you remove the -a option 
(and connect via TCP) that Exim will do what you want.

-- 
Kenneth Murchison     Oceana Matrix Ltd.
Software Engineer     21 Princeton Place
716-662-8973 x26      Orchard Park, NY 14127
--PGP Public Key--    http://www.oceana.com/~ken/ksm.pgp
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