[Dovecot] Dovecot 1.0 RC1 + Plugin cmusieve "Sendmail qui with signal 11"

[Dominique Feyer]

After a lot of test last night and today, I'm sure that sendmail (the
postfix comptatibility command, not sure for the orginal sendmail
binary) cann't run with a virtual user. 

The process must check limits for this user (pam) and crash if it found
nothing.

This is a big problem for our service.

we have one UID/GID per domain and we need sieve filtering.

I do some test with a sendmail wrapper that return always 0, and the
sieve library seems to work well.

So if anyone as a idea, ... my head is empty of new idea ...

Thanks,

Le mercredi 05 juillet 2006 à 16:20 +0200, Dominique Feyer a écrit :
> I add a wrapper to sendmail, with strace output.
> 
> I try to send a mail as root, without any problem.
> 
> If I try with LDA (deliver setuid, owner root), sendmail do a segfault
> when trying to check the ulimit for the virtual user
> (sendmail.346_as_virtual_users at line 326, the same line in file
> sendmail.718_as_root, line 326).
> 
> Now we can use the deliver setuid, to have one virtual user per domain
> or account, but it's not possible to use cmusieve plugin with this
> configuration.
> 
> Do you have any workaround for this "bug" ?
> 
> Thanks
> 
> 
> 
> Le mercredi 05 juillet 2006 à 13:29 +0200, Dominique Feyer a écrit :
> > Attached is the full strace output of deliver (strace.lda)
> > 
> > On line 255, I have:
> > 
> > waitpid(0, [{WIFSIGNALED(s) && WTERMSIG(s) == SIGSEGV}], 0) = 29859
> > --- SIGCHLD (Child exited) @ 0 (0) ---
> > 
> > I'm not a specialist of strace. But 29859 is the sendmail process for
> > sending redirect and/or vacation ?
> > 
> > I work last night on this problem and found nothing. Sendmail (postfix)
> > can send any mail without any problem. He crash (with signal 11) only
> > when deliver launch it.
> > 
> > 
> > 
> > 
> > Le mardi 04 juillet 2006 à 17:18 +0200, Dominique Feyer a écrit :
> > > Le mardi 04 juillet 2006 à 17:39 +0300, Timo Sirainen a écrit :
> > > > On Tue, 2006-07-04 at 11:33 +0200, Dominique Feyer wrote:
> > > > > I just install RC1 + Plugin cmusieve (cvs), the sieve script is compiled
> > > > > and the sive lib seems OK. But in my log I have sendmail qui with signal
> > > > > 11 when I try to send a mail with "redirect" or "vacation" ?
> > > > 
> > > > I remember hearing this before too. Did you ask about it before too? :)
> > > 
> > > Yes I have this problem one week before with some delivery problem
> > > (setuid).
> > > 
> > > Now with RC1, I can have deliver setuid, so I can use my virtual
> > > user/group (postgres) with LDA. And just for this thanks, this is
> > > perfect.
> > > 
> > > > 
> > > > Anyway, I can't really think of why it would crash. What if you change
> > > > the sendmail_path to /bin/true, does it still crash? (ie. is the crash
> > > > because of the sendmail binary or is it Dovecot's forked process that
> > > > crashes before starting the binary?)
> > > 
> > > I try with /bin/true, no error in the log, so I think this is a sendmail
> > > problem. I use the lateste postfix stable package for Debian Sarge ...
> > > that's a strange problem.
> > > 
> > > > 
> > > > If it really is crashing inside /usr/lib/sendmail, there's really
> > > > nothing that I can do about it.
> > > 
> > > Thanks for everything, your work on dovecot is really nice.
> > > 
> > > > 
> > > > > Any possibilitie to use a external SMTP server ?
> > > > 
> > > > No.
> > > 
> > > > 
-- 
Dominique Feyer
Administrateur Système
Ch. de la Colline 5bis
CH-1007 Lausanne
dfeyer at net4all.ch