244 lines
7.2 KiB
Groff
244 lines
7.2 KiB
Groff
\"
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.\" Standard preamble:
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.\" ========================================================================
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.de Sh \" Subsection heading
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.br
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.if t .Sp
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\fB\\$1\fR
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.tr \(*W-
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.rm #[ #] #H #V #F C
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.\" ========================================================================
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.\"
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.IX Title "postfix-policyd-spf-perl 1p"
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.TH postfix-policyd-spf-perl 8p "2007-01-11"
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.SH "NAME"
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postfix-policyd-spf-perl \- pure-Perl Postfix policy daemon for SPF checking
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.SH "VERSION"
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.IX Header "VERSION"
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2\.000
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.SH "USAGE"
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.IX Header "USAGE"
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Usage:
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policyd-spf-perl [-v]
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.SH "OTHER DOCUMENTATION"
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.IX Header "OTHER DOCUMENTATION"
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This documentation assumes you have read Postfix's README_FILES/
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SMTPD_POLICY_README.
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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postfix-policyd-spf-perl is a Postfix SMTPd policy daemon for SPF checking.
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It is implemented in pure Perl and uses the Mail::SPF CPAN module. Note that
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Mail::SPF is a complete re-implementation of SPF based on the final SPF RFC,
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RFC 4408. It shares no code with the older Mail::SPF::Query that was the
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original SPF development implementation.
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This version of the policy server will reject mail that fails either Mail From
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or HELO SPF checks. It always checks HELO (older versions just checked HELO if
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Mail From was null). It will defer mail if there is a temporary SPF error and
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the message would othersise be permitted (DEFER_IF_PERMIT). Otherwise, it will
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PREPEND the appropriate SPF Received header. In the case of multi-recipient
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mail, multiple headers will get appended. Error conditions within the policy
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server (that don't result in a crash) or from Mail::SPF will return DUNNO.
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Logging is sent to syslogd.
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Each time a Postfix SMTP server process is started it connects to the policy
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service socket and Postfix runs one instance of this Perls script. By
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default, a Postfix SMTP server process terminates after 100 seconds of idle
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time, or after serving 100 clients. Thus, the cost of starting this Perl
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script is smoothed over time
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The default policy_time_limit is 1000 seconds. This may be too short for some
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SMTP transactions to complete. As recommended in SMTPD_POLICY_README, this
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should be extended to 3600 seconds. To do so, set "policy_time_limit = 3600"
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in /etc/postfix/main.cf.
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.SH "TESTING THE POLICY DAEMON"
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.IX Header "TESTING THE POLICY DAEMON"
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Testing the policy daemon
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To test the policy daemon by hand, execute:
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% perl /usr/sbin/postfix-policyd-spf-perl
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Each query is a bunch of attributes. Order does not matter, and the daemon
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uses only a few of all the attributes shown below:
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request=smtpd_access_policy
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protocol_state=RCPT
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protocol_name=SMTP
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helo_name=some.domain.tld
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queue_id=8045F2AB23
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sender=foo@bar.tld
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recipient=bar@foo.tld
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client_address=1.2.3.4
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client_name=another.domain.tld
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[empty line]
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The policy daemon will answer in the same style, with an attribute list
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followed by a empty line:
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action=dunno
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[empty line]
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If you want more detail in the system logs change $VERBOSE to 1.
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.SH "POSTFIX INTEGRATION"
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.IX Header "POSTFIX INTEGRATION"
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1. Add the following to /etc/postfix/master.cf:
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policy unix - n n - - spawn
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user=nobody argv=/usr/bin/perl /usr/sbin/policyd-spf-perl
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2. Configure the Postfix policy service in /etc/postfix/main.cf:
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smtpd_recipient_restrictions =
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...
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reject_unauth_destination
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check_policy_service unix:private/policy
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...
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policy_time_limit = 3600
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NOTE: Specify check_policy_service AFTER reject_unauth_destination or
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else your system can become an open relay.
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3. Restart Postfix.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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libmail-spf-perl, <http://www.openspf.org>
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.SH "AUTHORS"
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.IX Header "AUTHORS"
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This version of \fBpolicyd-spf-perl\fR was written by Meng Weng Wong
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<mengwong+spf@pobox.com> and updated for libmail-spf-perl by Scott Kitterman
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<scott@kitterman.com>.
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.PP
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This man-page was written by Scott Kitterman <scott@kitterman.com>.
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