Re: Automatically inferring %d on multi-domain virtual install ?

22 Feb 2016 · *almost*

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On Sun, 21 Feb 2016, Leon Kyneur wrote:
...
Date: Sun, 21 Feb 2016 10:51:21 +0000
From: Leon Kyneur leon@dexterous.org
To: Dovecot Mailing List dovecot@dovecot.org, Timo Sirainen tss@iki.fi
Subject: Re: Automatically inferring %d on multi-domain virtual install ?
very intrigued by your solution Timo, have attempted something similar in
the past to no avail.
When I tried I was unable to retain the user@domain when setting the domain
as extra field - protected is new to me and can't find documentation - but
also doesn't work :(
# cat passwd.domains
10.100.1.1:::::::domain:protected=foo.org
10.100.1.2:::::::domain:protected=bar.org
# cat imap.passwd
user@bar.org:{plain}password::::::
user@foo.org:{plain}password::::::
dovecot.conf:
passdb {
args = username_format=%l /etc/dovecot/passwd.domains
default_fields = nopassword=y
driver = passwd-file
result_success = continue
}
passdb {
args = scheme=plain-md5 username_format=%u /etc/dovecot/imap.passwd
driver = passwd-file
}

user without domain localip 10.100.1.1 - adds foo.org:

doveadm auth lookup -x lip=10.100.1.1 user
passdb: user
user : user@foo.org

user without domain localip 10.100.1.2 - adds bar.org

doveadm auth lookup -x lip=10.100.1.2 user
passdb: user
user : user@bar.org

user WITH domain bar.org on localip 10.100.1.1 - still adds foo.org???

doveadm auth lookup -x lip=10.100.1.1 user@bar.org
passdb: user@bar.org
user : user@foo.org
Is the protected suffix supposed protect domain and not change it here?
The domain is overwritten by the first passdb, that caused 1. and 2. to
work :-) .
...
On Sun, Feb 21, 2016 at 1:20 PM Timo Sirainen tss@iki.fi wrote:
...
How about:
passdb {
driver = passwd-file
args = username_format=%l /etc/dovecot/passwd.domains
result_success = continue
}
passdb {
.. the real passdb for authentication ..
}
Where /etc/dovecot/passwd.domains contains:
10.0.0.100:::::domain=foo.org
10.0.0.101:::::domain=bar.org
So the first passdb lookup would set the domain based on IP and then
continue for the actual authentication. Or if you don't want it to override
an explicit user@domain authentication, this should also work:
10.0.0.100:::::domain:protected=foo.org
10.0.0.101:::::domain:protected=bar.org
Not tested, but should work I think. At least with new enough Dovecot
versions.
...
On 19 Feb 2016, at 23:10, Gabriel L. Somlo gsomlo@gmail.com wrote:
On Fri, Feb 19, 2016 at 08:41:15AM +0100, Steffen Kaiser wrote:
...
...
I'm trying to allow domain-less logins for a multi-domain virtual IMAP
server, and wondering if I can automatically infer the domain (value of
variable %d) from the local IP (%l) or the hostname used by the client
when connecting to my server.
Let's say I have two host names: mail.foo.org (10.0.0.100) and
mail.bar.com (10.0.0.200), with forward and reverse DNS configured to
resolve A and PTR records in either direction.
Let's also say I have 10.0.0.100 and 10.0.0.200 set up as secondaries
on my server's loopback interface, and routing is set up to bring
client
traffic to me for both of those IP addresses.
Hm, it should be possible like so:

keep the file you have now as 2nd passdb, in order to let your users
login like now from anywhere

...
user1@foo.org:{PLAIN}user1foo

from this file create another passwd-file with ExtraField via script
/
cron jobs, that defines

user1@10.0.0.100:{PLAIN}user1foo:::::user=user1@foo.org
see http://wiki2.dovecot.org/PasswordDatabase/ExtraFields
Maybe allow_nets could limit the clients further.
Then add another passdb section pointing to that file using
username_format=%n@%l
http://wiki2.dovecot.org/AuthDatabase/PasswdFile
That will map domain-less logins to full mail addresses, which in turn
sets
%d, too.
That *almost* worked :)
I now have
passdb {
driver = passwd-file
args = username_format=%n@%l /var/lib/topgen/etc/postfix/users
}
pointing to a "users" file with entries such as
user1@10.0.0.100:{PLAIN}user1foo:::::user=user1@foo.org
The only trouble is, %d does not get set; I get new "user1" and
"user2" folders created directly under /var/lib/vmail/, which
indicates the %d portion is equal to the empty string.
I also tried
user1@111.0.10.10:{PLAIN}tartans1:::::domain=foo.org
which the PasswordDatabase wiki page says should override %d, but
still no luck...
Thanks for the pointer though, now that I read the relevant bits of
documentation it feels like I'm really close, and this *should* work.
I'm still either missing something, or tickling a bug (probably the
former :)
Thanks,
--Gabriel
...
...
The relevant bits of my dovecot.conf are:
---%<------------------------------------------------------------------
mail_location = maildir:/var/lib/vmail/%d/%n
passdb {
driver = passwd-file
args = /var/lib/vmail/etc/postfix/userdb
}
userdb {
driver = static
args = uid=dovenull gid=dovenull home=/var/lib/vmail/%d/%n
}
---%<------------------------------------------------------------------
And my userdb passwd-file right now includes:
---%<------------------------------------------------------------------
user1@foo.org:{PLAIN}user1foo
user2@foo.org:{PLAIN}user2foo
user1@bar.com:{PLAIN}user1bar
user2@bar.com:{PLAIN}user2bar
---%<------------------------------------------------------------------
Right now, user1@foo.org must configure their imap client like so:
IMAP server: mail.foo.org
username: user1@foo.org
password: user1foo
I would like to require this (and other) users to only have to set:
IMAP server: mail.foo.org
username: user1
password: ...
and have dovecot somehow infer the "@foo.org" domain based on the fact
that the connection was made to 10.0.0.100, which is mail.foo.org, and
therefore the domain can *only* be "@foo.org".
I could start out by splitting my user database into two files:
userdb.foo.org
---%<------------------------------------------------------------------
user1:{PLAIN}user1foo
user2:{PLAIN}user2foo
---%<------------------------------------------------------------------
userdb.bar.com
---%<------------------------------------------------------------------
user1:{PLAIN}user1bar
user2:{PLAIN}user2bar
---%<------------------------------------------------------------------
... then modify dovecot.conf's passdb setup like so:
---%<------------------------------------------------------------------
passdb {
driver = passwd-file
args = /var/lib/vmail/etc/postfix/userdb.%d
}
---%<------------------------------------------------------------------
... but how would I insure that %d is set to the proper value based
on e.g. a reverse lookup of %l, which, in foo.org's case would be
10.0.0.100, and resolve to mail.foo.org, and *somehow* that would
match %d == "@foo.org" ?
Is this even possible in the first place, or am I just being too fussy
about the aesthetics of my users' imap client config files ? :) :)
Thanks much,
--Gabriel

-- Steffen Kaiser
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Steffen Kaiser
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