NAME
policyd-weight - weighted SMTP policy daemon
STATUS
Beta, Documentation incomplete
SYNOPSIS
policyd-weight [-option] [-option2 <arg>] command
DESCRIPTION
policyd-weight(8) is a SMTP policy daemon written in perl(1) for
postfix(1). It evaluates based on RBL/RHSBL results, HELO and MAIL FROM
domain and subdomain arguments and the client IP address the
possibility of forgery or SPAM. It is designed to be called before the
SMTP DATA command at the RCPT TO stage. This way it is a) possible to
reject a mail attempt before the body has been received and b) to keep
multirecipient mail intact, i.e. provide the functionality of selective
usage based on recipients.
To make policyd-weight(8) work with postfix(1), it is required to add a
system account for $USER (default: polw)
Policyd-weight can operate in master.cf or daemon mode. In master.cf
mode it uses postfix’ spawn(8), which results in number of simultanous
requests perl instances. In daemon mode it uses shared memory and forks
on load, and only if all childs are busy.
At the time of writing the man-pages for policyd-weight assume a
postfix installation. It has been reported that policyd-weight works
with other MTAs like Exim, too.
SETUP
master.cf mode:
master.cf:
policy unix - n n - - spawn user=polw
argv=/usr/bin/perl /usr/local/bin/policyd-weight
main.cf:
smtpd_recipient_restrictions =
permit_mynetworks,
... authenticated permits ...
reject_unauth_destination,
... whitelists, role accounts, clients ...
check_policy_service unix:private/policy
daemon mode:
start the daemon with policyd-weight start. Poliyd-weight then listens
on $TCP_PORT (default: 12525) for policy requests. To make postfix
talk to that port do following changes to main.cf:
main.cf:
smtpd_recipient_restrictions =
permit_mynetworks,
... authenticated permits ...
reject_unauth_destination,
... whitelists, role accounts, clients ...
check_policy_service inet:127.0.0.1:12525
It is possible to have more than one postfix server talk to the
daemonized policyd-weight by configuring each postfix machine to query
the policy server with check_policy_service inet:IP:12525 where IP is
the host on which policyd-weight runs.
Please note that check_policy_service should come at last, or at least
after reject_unauth_destination, or else you may become an open relay.
COMMANDS
Following commands exist and are reserved for daemon mode only:
start start the policy server
stop stop the policy server
restart restart the policy server
reload tells the policy server to reload its configuration
defaults prints the default settings to STDOUT and exits
OPTIONS
-d operate in debug mode
Not for use in master.cf. In debug mode everything is reported
on STDOUT instead of syslog(3). Also an own debug cache daemon
will be spawned. The socket-file is named after the value of
$SPATH with ".debug" as suffix.
-f /path/to/file
Pass a configuration file to policyd-weight
-h show help
-k kill cache daemon
Not for use in master.cf. Together with -d this kills the debug
cache daemon. Without -d it kills the global running cache
daemon.
-s show cache entries
Not for use in master.cf.
-v show version
LOGGING
Logging is done via syslog(3) with facility "mail" and priority "info".
For a complete list of log entries and their correspondending
configuration parameters refer to policyd-weight.conf(5).
BUGS
Please report bugs to r.felber@ek-muc.de
HISTORY
March 2005
Ralf Hildebrandt (Author of the Book of Postfix) is the
spiritual father of policyd-weight. It was his idea to have a
scored RBL evaluation, I’ve added the weighted MAIL FROM/HELO
DNS-evaluation. For that purpose I used Meng Wong’s spf.pl which
was shipped with the postfix source as example.
FILES
/etc/policyd-weight.conf, Policyd-weight configuration file
/etc/postfix/main.cf, Postfix configuration parameters
/etc/postfix/master.cf, Postfix daemon processes
SEE ALSO
policyd-weight.conf(5), Policyd-weight configuration file
master(5), Postfix master.cf file syntax
postconf(5), Postfix main.cf file syntax
access(5), Postfix SMTP access control table
LICENSE
GNU General Public License
AUTHOR
Robert Felber <r.felber@ek-muc.de>
Autohaus Erich Kuttendreier
81827 Munich, Germany
Aug 25th, 2006 policyd-weight(8)