Re: antispam plugin, pipe backend, how to make it work?

On 12-04-16 20:14, Johannes Rohr wrote:

Hi, my setup is a dovecot 2.0.19 IMAP server on Ubuntu Precise with

the antispam plugin in version 2.0+20120225-2 and spamassassin at version 3.2.2

I have been trying and failed to get the pipe backend of the antispam plugin to work. Spamassin by itself works, a manual call of sa-learn works fine. Bayes data is stored in a mysql DB.

I have the following configuration in /etc/dovecot/conf.d/90-plugin.conf

plugin { #setting_name = value sieve=~/.dovecot.sieve sieve_dir=~/sieve antispam_pipe_program_spam_arg = --spam antispam_pipe_program_notspam_arg = --ham antispam_pipe_program = /usr/local/bin/sa-learn-pipe.sh antispam_pipe_program_args = --username=%u # % expansion done by dovecot

You need to specify the argument list as a list seperated by semicolons, per example on the wiki:

antispam_pipe_program_args = --username;%u

The verbose debug should give you some logging to work with. Also, what does the wrapper script log when dovecot runs it? How does that differ from a manual run?

antispam_trash = trash;Trash;Deleted Items;Deleted Messages
antispam_spam = SPAM;Junk
antispam_backend = pipe
antispam_verbose_debug = 1
antispam_debug_target = syslog
antispam_pipe_tmpdir = /tmp

}

I have tried the following wrapper script: #!/bin/bash # set -x LOGFILE=/tmp/sa-learn-pipe.log echo "$$-start ($*)" >> $LOGFILE #echo $* > /tmp/sendmail-parms.txt cat<&0 >> /tmp/sendmail-msg-$$.txt /usr/bin/sa-learn $* -D /tmp/sendmail-msg-$$.txt >> $LOGFILE 2>&1 &&
rm -f /tmp/sendmail-msg-$$.txt echo "$$-end" >> $LOGFILE exit 0

It somehow isn't working. I can call the wrapper script manually e.g. sudo -u vmail /usr/local/bin/sa-learn-pipe.sh --username=some@mail.user --ham
< someham

But it doesn't work from dovecot. It seems the script is called. but no new patterns show up in the bayes DB. Unfortunately, the plugin seems to be documented poorly. How does it call the programme it pipes to? Is it something like $programme --par1 --par2 < message ? Why can't / shouldn't I call sa-learn directly? All the instructions I found on the in internet contained a wrapper script, but none bothered to explain why you would actually need it.

I would be very grateful, if someone could enlighten me on that...

Cheers,

Johannes