postfix-policyd-spf-perl-2.003/0000755000175000017500000000000010611152622016617 5ustar kittermakittermapostfix-policyd-spf-perl-2.003/postfix-policyd-spf-perl0000755000175000017500000002471610611137446023451 0ustar kittermakitterma#!/usr/bin/perl # postfix-policyd-spf-perl # http://www.openspf.org/Software # version 2.003 # # (C) 2007 Scott Kitterman # (C) 2007 Julian Mehnle # (C) 2003-2004 Meng Weng Wong # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License along # with this program; if not, write to the Free Software Foundation, Inc., # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. use version; our $VERSION = qv('2.003'); use strict; use IO::Handle; use Sys::Syslog qw(:DEFAULT setlogsock); use NetAddr::IP; use Mail::SPF; # ---------------------------------------------------------- # configuration # ---------------------------------------------------------- my $spf_server = Mail::SPF::Server->new(); # Adding more handlers is easy: my @HANDLERS = ( { name => 'exempt_localhost', code => \&exempt_localhost }, { name => 'exempt_relay', code => \&exempt_relay }, { name => 'sender_policy_framework', code => \&sender_policy_framework } ); my $VERBOSE = 0; my $DEFAULT_RESPONSE = 'DUNNO'; # # Syslogging options for verbose mode and for fatal errors. # NOTE: comment out the $syslog_socktype line if syslogging does not # work on your system. # my $syslog_socktype = 'unix'; # inet, unix, stream, console my $syslog_facility = 'mail'; my $syslog_options = 'pid'; my $syslog_ident = 'postfix/policy-spf'; use constant localhost_addresses => map( NetAddr::IP->new($_), qw( 127.0.0.0/8 ::ffff:127.0.0.0/104 ::1 ) ); # Does Postfix ever say "client_address=::ffff:"? use constant relay_addresses => map( NetAddr::IP->new($_), qw( ) ); # add addresses to qw ( ) above separated by spaces using CIDR notation. my %results_cache; # by message instance # ---------------------------------------------------------- # initialization # ---------------------------------------------------------- # # Log an error and abort. # sub fatal_exit { syslog(err => "fatal_exit: @_"); syslog(warning => "fatal_exit: @_"); syslog(info => "fatal_exit: @_"); die("fatal: @_"); } # # Unbuffer standard output. # STDOUT->autoflush(1); # # This process runs as a daemon, so it can't log to a terminal. Use # syslog so that people can actually see our messages. # setlogsock($syslog_socktype); openlog($syslog_ident, $syslog_options, $syslog_facility); # ---------------------------------------------------------- # main # ---------------------------------------------------------- # # Receive a bunch of attributes, evaluate the policy, send the result. # my %attr; while () { chomp; if (/=/) { my ($key, $value) =split (/=/, $_, 2); $attr{$key} = $value; next; } elsif (length) { syslog(warning => sprintf("warning: ignoring garbage: %.100s", $_)); next; } if ($VERBOSE) { for (sort keys %attr) { syslog(debug => "Attribute: %s=%s", $_, $attr{$_}); } } my $message_instance = $attr{instance}; my $cache = defined($message_instance) ? $results_cache{$message_instance} ||= {} : {}; my $action = $DEFAULT_RESPONSE; foreach my $handler (@HANDLERS) { my $handler_name = $handler->{name}; my $handler_code = $handler->{code}; my $response = $handler_code->(attr => \%attr, cache => $cache); if ($VERBOSE) { syslog(debug => "handler %s: %s", $handler_name, $response); } # Pick whatever response is not 'DUNNO' if ($response and $response !~ /^DUNNO/i) { syslog(info => "handler %s: is decisive.", $handler_name); $action = $response; last; } } syslog(info => "%s: Policy action=%s", $attr{queue_id}, $action); STDOUT->print("action=$action\n\n"); %attr = (); } # ---------------------------------------------------------- # handler: localhost exemption # ---------------------------------------------------------- sub exempt_localhost { my %options = @_; my $attr = $options{attr}; if ($attr->{client_address} != '') { my $client_address = NetAddr::IP->new($attr->{client_address}); return 'PREPEND X-Comment SPF not applicable to localhost connection, skipped check' if grep($_->contains($client_address), localhost_addresses); }; return 'DUNNO'; } # ---------------------------------------------------------- # handler: relay exemption # ---------------------------------------------------------- sub exempt_relay { my %options = @_; my $attr = $options{attr}; if ($attr->{client_address} != '') { my $client_address = NetAddr::IP->new($attr->{client_address}); return 'PREPEND X-Comment SPF skipped for whitelisted relay' if grep($_->contains($client_address), relay_addresses); }; return 'DUNNO'; } # ---------------------------------------------------------- # handler: SPF # ---------------------------------------------------------- sub sender_policy_framework { my %options = @_; my $attr = $options{attr}; my $cache = $options{cache}; # ------------------------------------------------------------------------- # Always do HELO check first. If no HELO policy, it's only one lookup. # This avoids the need to do any MAIL FROM processing for null sender. # ------------------------------------------------------------------------- my $helo_result = $cache->{helo_result}; if (not defined($helo_result)) { # No HELO result has been cached from earlier checks on this message. my $helo_request = eval { Mail::SPF::Request->new( scope => 'helo', identity => $attr->{helo_name}, ip_address => $attr->{client_address} ); }; if ($@) { # An unexpected error occurred during request creation, # probably due to invalid input data! my $errmsg = $@; $errmsg = $errmsg->text if UNIVERSAL::isa($@, 'Mail::SPF::Exception'); syslog( info => "%s:HELO check failed - Mail::SPF->new(%s, %s, %s) failed: %s", $attr->{queue_id}, $attr->{client_address}, $attr->{sender}, $attr->{helo_name}, $errmsg ); return; } $helo_result = $cache->{helo_result} = $spf_server->process($helo_request); } my $helo_result_code = $helo_result->code; # 'pass', 'fail', etc. my $helo_local_exp = $helo_result->local_explanation; my $helo_authority_exp = $helo_result->authority_explanation if $helo_result->is_code('fail'); my $helo_spf_header = $helo_result->received_spf_header; if ($VERBOSE) { syslog( info => "%s: SPF %s: HELO/EHLO: %s, IP Address: %s, Recipient: %s", $attr->{queue_id}, $helo_result, $attr->{helo_name}, $attr->{client_address}, $attr->{recipient} ); }; # Reject on HELO fail. Defer on HELO temperror if message would otherwise # be accepted. Use the HELO result and return for null sender. if ($helo_result->is_code('fail')) { return "550 $helo_authority_exp"; } elsif ($helo_result->is_code('temperror')) { return "DEFER_IF_PERMIT SPF-Result=$helo_local_exp"; } elsif ($attr->{sender} eq '') { return "PREPEND $helo_spf_header" unless $cache->{added_spf_header}++; } # ------------------------------------------------------------------------- # Do MAIL FROM check (as HELO did not give a definitive result) # ------------------------------------------------------------------------- my $mfrom_result = $cache->{mfrom_result}; if (not defined($mfrom_result)) { # No MAIL FROM result has been cached from earlier checks on this message. my $mfrom_request = eval { Mail::SPF::Request->new( scope => 'mfrom', identity => $attr->{sender}, ip_address => $attr->{client_address}, helo_identity => $attr->{helo_name} # for %{h} macro expansion ); }; if ($@) { # An unexpected error occurred during request creation, # probably due to invalid input data! my $errmsg = $@; $errmsg = $errmsg->text if UNIVERSAL::isa($@, 'Mail::SPF::Exception'); syslog( info => "%s: Mail From (sender) check failed - Mail::SPF->new(%s, %s, %s) failed: %s", $attr->{queue_id}, $attr->{client_address}, $attr->{sender}, $attr->{helo_name}, $errmsg ); return; } $mfrom_result = $cache->{mfrom_result} = $spf_server->process($mfrom_request); } my $mfrom_result_code = $mfrom_result->code; # 'pass', 'fail', etc. my $mfrom_local_exp = $mfrom_result->local_explanation; my $mfrom_authority_exp = $mfrom_result->authority_explanation if $mfrom_result->is_code('fail'); my $mfrom_spf_header = $mfrom_result->received_spf_header; if ($VERBOSE) { syslog( info => "%s: SPF %s: Envelope-from: %s, IP Address: %s, Recipient: %s", $attr->{queue_id}, $mfrom_result, $attr->{sender}, $attr->{client_address}, $attr->{recipient} ); }; # Same approach as HELO.... if ($mfrom_result->is_code('fail')) { return "550 $mfrom_authority_exp"; } elsif ($mfrom_result->is_code('temperror')) { return "DEFER_IF_PERMIT SPF-Result=$mfrom_local_exp"; } else { return "PREPEND $mfrom_spf_header" unless $cache->{added_spf_header}++; } return; } postfix-policyd-spf-perl-2.003/LICENSE0000644000175000017500000004310310560777534017647 0ustar kittermakitterma GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 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It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. , 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. postfix-policyd-spf-perl-2.003/README0000644000175000017500000000762010611141130017474 0ustar kittermakittermapostfix-policyd-spf-perl 2.003 A Postfix SMTPd policy server for SPF checking (C) 2007 Scott Kitterman and Julian Mehnle (C) 2003-2004 Meng Weng Wong Thanks for contributions by various members of the SPF project ============================================================================== postfix-policyd-spf-perl is a Postfix SMTPd policy daemon for SPF checking. It is implemented in pure Perl and uses the Mail::SPF CPAN module. Note that Mail::SPF is a complete re-implementation of SPF based on the final SPF RFC, RFC 4408. It shares no code with the older Mail::SPF::Query that was the original SPF development implementation. If you are upgrading from on older version of this policy server you will need to install Mail::SPF. This version of the policy server always checks HELO before Mail From (older versions just checked HELO if Mail From was null). It will reject mail that fails either Mail From or HELO SPF checks. It will defer mail if there is a temporary SPF error and the message would othersise be permitted (DEFER_IF_PERMIT). If the HELO check produces a REJECT/DEFER result, Mail From will not be checked. If the message is not rejected or deferred, the policy server will PREPEND the appropriate SPF Received header. If Mail From is anything other than completely empty (i.e. <>) then the Mail From result will be used for SPF Received (e.g. Mail From None even if HELO is Pass). The policy server skips SPF checks for connections from the localhost (127.) and instead prepends and logs 'SPF skipped - localhost is always allowed.' If you have relays that you want to skip SPF checks for, you can add them to relay_addresses on line 78 using standard CIDR notation in a space separated list. For these addresses, 'X-Comment SPF skipped for whitelisted relay' is prepended and logged. Error conditions within the policy server (that don't result in a crash) or from Mail::SPF will return DUNNO. See INSTALL for installation instructions. Usage: policyd-spf-perl [-v] This documentation assumes you have read Postfix's README_FILES/ SMTPD_POLICY_README. Logging is sent to syslogd. Each time a Postfix SMTP server process is started it connects to the policy service socket, and Postfix runs one instance of this Perl script. By default, a Postfix SMTP server process terminates after 100 seconds of idle time, or after serving 100 clients. Thus, the cost of starting this Perl script is smoothed out over time. The default policy_time_limit is 1000 seconds. This may be too short for some SMTP transactions to complete. As recommended in SMTPD_POLICY_README, this should be extended to 3600 seconds. To do so, set "policy_time_limit = 3600" in /etc/postfix/main.cf. Testing the policy daemon ------------------------- To test the policy daemon by hand, execute: % perl /usr/local/lib/policyd-spf-perl Each query is a bunch of attributes. Order does not matter, and the daemon uses only a few of all the attributes shown below: request=smtpd_access_policy protocol_state=RCPT protocol_name=SMTP helo_name=some.domain.tld queue_id= instance=71b0.45e2f5f1.d4da1.0 sender=foo@bar.tld recipient=bar@foo.tld client_address=1.2.3.4 client_name=another.domain.tld [empty line] The policy daemon will answer in the same style, with an attribute list followed by a empty line: action=550 Please see http://www.openspf.org/Why?id=foo@bar.tld&ip=1.2.3.4& receiver=bar@foo.tld [empty line] To test HELO checking sender should be empty: sender= ... More attributes... [empty line] If you want more detail in the system logs change $VERBOSE to 1. License ------- postfix-policyd-spf-perl is free software. You may use, modify, and distribute it under the GNU GPL (version 2 or later); see the LICENSE file. postfix-policyd-spf-perl-2.003/CHANGES0000644000175000017500000000410110611141534017606 0ustar kittermakitterma# Legend: # --- = A new release # + = Added a feature (in a backwards compatible way) # ! = Changed something significant, or removed a feature # * = Fixed a bug, or made a minor improvement --- 2.003 (2007-04-17 08:50) * Minor documentation cleanup. + Add handler for list of relay addresses to bypass. --- 2.002 (2007-02-20 05:45) * Added Julian Menhle to copyright statement. * 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. --- 2.001 (2007-02-08 00:36) * Safer check for local connections. --- 2.000 (2007-02-07 17:07) * Change reject reply to 550 for RFC 2821 compliance. * Skip SPF checks for local (127.) connections * Clarified wording for some verbose logging. * Added more information about HELO checking to README. --- 1.990 (2007-02-03 16:00) postfix-policyd-spf-perl: ! Changed from Mail::SPF::Query to Mail::SPF for RFC 4408 compliance ! Removed Testing handler (usage was undocumented). ! Removed debian/ dir from release tarball (still provided via SVN). * Simplified logging. Policy server is less chatty. Logs are clearer. --- 1.08.1 (2007-01-10 21:00) postfix-policyd-spf-perl: * Minor and purely cosmetic code clean-up. Miscellaneous: * Updated README file with new website URL and copyright. * Added LICENSE file as an explicit copy of the GPLv2. Debian: * New maintainer: Scott Kitterman * Priority: extra (was: optional) * Removed Build-Depends-Indep: perl, as there really is no need for it. * Depends: libversion-perl * Updated debian/copyright. --- 1.08 (2006-06-17 20:00) * Added Debian package control files. * Moved documentation from executable into separate README and INSTALL files. Improved documentation. * Minor and purely cosmetic code clean-up. # $Id: CHANGES 85 2007-04-17 12:53:50Z Scott Kitterman $ # vim:tw=79 sts=2 sw=2 postfix-policyd-spf-perl-2.003/INSTALL0000644000175000017500000000154010570573504017662 0ustar kittermakittermaSystem Requirements ------------------- The following Perl version and packages are required for running postfix-policyd-spf-perl: Perl 5.6 version NetAddr-IP 4 Mail-SPF (not Mail-SPF-Query) Installing ---------- 1. Copy postfix-policyd-spf-perl to /usr/local/lib/policyd-spf-perl 2. Add the following to /etc/postfix/master.cf: policy unix - n n - - spawn user=nobody argv=/usr/bin/perl /usr/local/lib/policyd-spf-perl 3. Configure the Postfix policy service in /etc/postfix/main.cf: smtpd_recipient_restrictions = ... reject_unauth_destination check_policy_service unix:private/policy ... NOTE: Specify check_policy_service AFTER reject_unauth_destination or else your system can become an open relay. 4. Restart Postfix.