software/postfix-policyd-spf-perl/trunk/postfix-policyd-spf-perl
* Added myself to copyright statement after all. * Implemented results cache in order to prevent redundant SPF checks in multiple invocations per message instance. This also enables us to prepend a "Received-SPF" header only once per message instance (as opposed to once per recipient address). * Minor code and comments clean-up.
This commit is contained in:
Julian Mehnle
parent
0f355dacc2
commit
e041d210e3
1 changed files with 124 additions and 102 deletions
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@ -4,8 +4,9 @@
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# http://www.openspf.org/Software
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# version 2.002
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#
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#(C) 2007 Scott Kitterman <scott@kitterman.com>
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#(C) 2003-2004 Meng Weng Wong <mengwong@pobox.com>
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# (C) 2007 Scott Kitterman <scott@kitterman.com>
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# (C) 2007 Julian Mehnle <julian@mehnle.net>
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# (C) 2003-2004 Meng Weng Wong <mengwong@pobox.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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@ -36,7 +37,7 @@ use Mail::SPF;
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my $spf_server = Mail::SPF::Server->new();
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# Leaving this to make it easier to add more handlers later:
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# Adding more handlers is easy:
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my @HANDLERS = (
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{
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name => 'exempt_localhost',
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@ -51,7 +52,6 @@ my @HANDLERS = (
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my $VERBOSE = 0;
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my $DEFAULT_RESPONSE = 'DUNNO';
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my $accepted = "UNDEF";
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#
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# Syslogging options for verbose mode and for fatal errors.
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@ -69,6 +69,8 @@ use constant localhost_addresses => map(
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qw( 127.0.0.0/8 ::ffff:127.0.0.0/104 ::1 )
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); # Does Postfix ever say "client_address=::ffff:<ipv4-address>"?
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my %results_cache; # by message instance
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# ----------------------------------------------------------
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# initialization
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# ----------------------------------------------------------
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@ -121,38 +123,33 @@ while (<STDIN>) {
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syslog(debug => "Attribute: %s=%s", $_, $attr{$_});
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}
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}
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my $instance = $attr{instance};
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my $message_instance = $attr{instance};
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my $cache = defined($message_instance) ? $results_cache{$message_instance} ||= {} : {};
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my $action = $DEFAULT_RESPONSE;
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my %responses;
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# Skip SPF check for local connections
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foreach my $handler (@HANDLERS) {
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my $handler_name = $handler->{name};
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my $handler_code = $handler->{code};
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my $response = $handler_code->(attr => \%attr);
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if($instance && $instance eq $accepted) {
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$response = 'DUNNO';
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}
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my $response = $handler_code->(attr => \%attr, cache => $cache);
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if ($VERBOSE) {
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syslog(debug => "handler %s: %s", $handler_name, $response);
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}
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# Picks whatever response is not 'DUNNO'
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# Pick whatever response is not 'DUNNO'
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if ($response and $response !~ /^DUNNO/i) {
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syslog(info => "handler %s: is decisive.", $handler_name);
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$action = $response;
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last;
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}
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}
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syslog(info => "%s: Policy action=%s", $attr{queue_id}, $action);
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STDOUT->print("action=$action\n\n");
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$accepted = $instance;
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%attr = ();
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}
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@ -177,102 +174,127 @@ sub exempt_localhost {
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sub sender_policy_framework {
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my %options = @_;
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my $attr = $options{attr};
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# Always do HELO check first. If no HELO policy it's only one lookup.
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# Avoids the need to do any Mail From processing for null sender.
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my $helo_request = eval {
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Mail::SPF::Request->new(
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scope => 'helo',
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identity => $attr->{helo_name},
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ip_address => $attr->{client_address}
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);
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};
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my $attr = $options{attr};
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my $cache = $options{cache};
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# If initializing helo_request throws an error, don't use it.
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if ($@) {
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my $errmsg = $@;
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$errmsg = $errmsg->text if UNIVERSAL::isa($@, 'Mail::SPF::Exception');
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syslog(
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info => "%s:HELO check failed - Mail::SPF->new(%s, %s, %s) failed: %s",
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$attr->{queue_id}, $attr->{client_address}, $attr->{sender}, $attr->{helo_name}, $errmsg
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);
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return 'DUNNO';
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}
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else {
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my $helo_result = $spf_server->process($helo_request);
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# -------------------------------------------------------------------------
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# Always do HELO check first. If no HELO policy, it's only one lookup.
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# This avoids the need to do any MAIL FROM processing for null sender.
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# -------------------------------------------------------------------------
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my $helo_result = $cache->{helo_result};
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if (not defined($helo_result)) {
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# No HELO result has been cached from earlier checks on this message.
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my $helo_result_code = $helo_result->code; # 'pass', 'fail', etc.
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my $helo_local_exp = $helo_result->local_explanation;
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my $helo_authority_exp = $helo_result->authority_explanation
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if $helo_result->is_code('fail');
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my $helo_spf_header = $helo_result->received_spf_header;
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if ($VERBOSE) {
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syslog(
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info => "%s: SPF %s: HELO/EHLO: %s, IP Address: %s, Recipient: %s",
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$attr->{queue_id}, $helo_result, $attr->{helo_name}, $attr->{client_address},
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$attr->{recipient}
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my $helo_request = eval {
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Mail::SPF::Request->new(
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scope => 'helo',
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identity => $attr->{helo_name},
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ip_address => $attr->{client_address}
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);
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};
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# Reject on HELO fail. Defer on HELO temperror if message would otherwise
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# be accepted. Use the HELO result and return for null sender.
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if ($helo_result->is_code('fail')) {
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return "550 $helo_authority_exp";
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}
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elsif ($helo_result->is_code('temperror')) {
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return "DEFER_IF_PERMIT SPF-Result=$helo_local_exp";
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}
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elsif ($attr->{sender} eq '') {
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return "PREPEND $helo_spf_header";
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if ($@) {
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# An unexpected error occurred during request creation,
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# probably due to invalid input data!
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my $errmsg = $@;
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$errmsg = $errmsg->text if UNIVERSAL::isa($@, 'Mail::SPF::Exception');
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syslog(
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info => "%s:HELO check failed - Mail::SPF->new(%s, %s, %s) failed: %s",
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$attr->{queue_id}, $attr->{client_address}, $attr->{sender}, $attr->{helo_name}, $errmsg
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);
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return;
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}
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$helo_result = $cache->{helo_result} = $spf_server->process($helo_request);
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}
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# Do mail from is HELO doesn't give a definitive result.
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my $mfrom_request = eval {
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Mail::SPF::Request->new(
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scope => 'mfrom',
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identity => $attr->{sender},
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ip_address => $attr->{client_address},
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helo_identity => $attr->{helo_name} # for %{h} macro expansion
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my $helo_result_code = $helo_result->code; # 'pass', 'fail', etc.
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my $helo_local_exp = $helo_result->local_explanation;
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my $helo_authority_exp = $helo_result->authority_explanation
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if $helo_result->is_code('fail');
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my $helo_spf_header = $helo_result->received_spf_header;
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if ($VERBOSE) {
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syslog(
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info => "%s: SPF %s: HELO/EHLO: %s, IP Address: %s, Recipient: %s",
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$attr->{queue_id}, $helo_result, $attr->{helo_name}, $attr->{client_address},
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$attr->{recipient}
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);
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};
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if ($@) {
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my $errmsg = $@;
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$errmsg = $errmsg->text if UNIVERSAL::isa($@, 'Mail::SPF::Exception');
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syslog(
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info => "%s: Mail From (sender) check failed - Mail::SPF->new(%s, %s, %s) failed: %s",
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$attr->{queue_id}, $attr->{client_address}, $attr->{sender}, $attr->{helo_name}, $errmsg
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);
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return 'DUNNO';
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}
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else {
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my $mfrom_result = $spf_server->process($mfrom_request);
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# Reject on HELO fail. Defer on HELO temperror if message would otherwise
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# be accepted. Use the HELO result and return for null sender.
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if ($helo_result->is_code('fail')) {
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return "550 $helo_authority_exp";
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}
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elsif ($helo_result->is_code('temperror')) {
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return "DEFER_IF_PERMIT SPF-Result=$helo_local_exp";
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}
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elsif ($attr->{sender} eq '') {
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return "PREPEND $helo_spf_header"
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unless $cache->{added_spf_header}++;
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}
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# -------------------------------------------------------------------------
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# Do MAIL FROM check (as HELO did not give a definitive result)
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# -------------------------------------------------------------------------
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my $mfrom_result = $cache->{mfrom_result};
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if (not defined($mfrom_result)) {
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# No MAIL FROM result has been cached from earlier checks on this message.
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my $mfrom_result_code = $mfrom_result->code; # 'pass', 'fail', etc.
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my $mfrom_local_exp = $mfrom_result->local_explanation;
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my $mfrom_authority_exp = $mfrom_result->authority_explanation
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if $mfrom_result->is_code('fail');
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my $mfrom_spf_header = $mfrom_result->received_spf_header;
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if ($VERBOSE) {
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syslog(
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info => "%s: SPF %s: Envelope-from: %s, IP Address: %s, Recipient: %s",
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$attr->{queue_id}, $mfrom_result, $attr->{sender}, $attr->{client_address},
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$attr->{recipient}
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my $mfrom_request = eval {
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Mail::SPF::Request->new(
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scope => 'mfrom',
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identity => $attr->{sender},
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ip_address => $attr->{client_address},
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helo_identity => $attr->{helo_name} # for %{h} macro expansion
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);
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};
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# Same approach as HELO....
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if ($mfrom_result->is_code('fail')) {
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return "550 $mfrom_authority_exp";
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}
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elsif ($mfrom_result->is_code('temperror')) {
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return "DEFER_IF_PERMIT SPF-Result=$mfrom_local_exp";
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}
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else {
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return "PREPEND $mfrom_spf_header";
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}
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if ($@) {
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# An unexpected error occurred during request creation,
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# probably due to invalid input data!
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my $errmsg = $@;
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$errmsg = $errmsg->text if UNIVERSAL::isa($@, 'Mail::SPF::Exception');
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syslog(
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info => "%s: Mail From (sender) check failed - Mail::SPF->new(%s, %s, %s) failed: %s",
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$attr->{queue_id}, $attr->{client_address}, $attr->{sender}, $attr->{helo_name}, $errmsg
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);
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return;
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}
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$mfrom_result = $cache->{mfrom_result} = $spf_server->process($mfrom_request);
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}
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my $mfrom_result_code = $mfrom_result->code; # 'pass', 'fail', etc.
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my $mfrom_local_exp = $mfrom_result->local_explanation;
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my $mfrom_authority_exp = $mfrom_result->authority_explanation
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if $mfrom_result->is_code('fail');
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my $mfrom_spf_header = $mfrom_result->received_spf_header;
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if ($VERBOSE) {
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syslog(
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info => "%s: SPF %s: Envelope-from: %s, IP Address: %s, Recipient: %s",
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$attr->{queue_id}, $mfrom_result, $attr->{sender}, $attr->{client_address},
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$attr->{recipient}
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);
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};
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# Same approach as HELO....
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if ($mfrom_result->is_code('fail')) {
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return "550 $mfrom_authority_exp";
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}
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elsif ($mfrom_result->is_code('temperror')) {
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return "DEFER_IF_PERMIT SPF-Result=$mfrom_local_exp";
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}
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else {
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return "PREPEND $mfrom_spf_header"
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unless $cache->{added_spf_header}++;
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}
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return;
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}
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