From fa82a617a0c50b7478cd2b7189aa5f7d14449954 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Sat, 30 May 2015 13:23:19 +0200
Subject: Upgrade the MX configuration from Wheezy to Jessie.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

In particular, since Postfix is now able to perform LDAP lookups using
SASL, previous hacks with simble binds on cn=postfix,ou=services,… can
now be removed.
---
 roles/MX/files/usr/local/bin/reserved-alias.pl | 111 +++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100755 roles/MX/files/usr/local/bin/reserved-alias.pl

(limited to 'roles/MX/files/usr/local/bin/reserved-alias.pl')

diff --git a/roles/MX/files/usr/local/bin/reserved-alias.pl b/roles/MX/files/usr/local/bin/reserved-alias.pl
new file mode 100755
index 0000000..e19492e
--- /dev/null
+++ b/roles/MX/files/usr/local/bin/reserved-alias.pl
@@ -0,0 +1,111 @@
+#!/usr/bin/perl
+
+# Copyright © 2013 Guilhem Moulin <guilhem@fripost.org>
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+use warnings;
+use strict;
+use Net::LDAPI;
+use Net::LDAP::Util qw/escape_filter_value ldap_explode_dn escape_dn_value/;
+use Authen::SASL;
+use Net::SMTP;
+
+if (!@ARGV or grep { $_ eq '-h' or $_ eq '--help' } @ARGV) {
+    # Help
+    print STDERR "Usage: $0 {original sender} {original recipient} [additional recipient ...]\n";
+    print STDERR "\n";
+    print STDERR "The message read from the standard input is redirected to 'additional recipient',\n";
+    print STDERR "and also forwarded to the domain owner if any. If the 'additional recipient' begins\n";
+    print STDERR "with '\@', the localpart of 'original recipient' is prepended.\n";
+    print STDERR "\n";
+    print STDERR "This is mostly useful to comply to RFC 822 section 6.3 and RFC 2142 section\n";
+    print STDERR "4 (to forward mails to 'postmaster\@' and 'abuse\@' to the site admin in\n";
+    print STDERR "addition to the virtual domain manager).\n";
+    exit;
+}
+
+# The original sender
+my $sender = shift;
+
+# The original recipient
+my $orig = shift;
+$orig =~ /^(.+)\@([^@]+)$/
+    or warn "Warning: Non fully qualified: $orig";
+my ($local,$domain) = ($1,$2);
+
+# The new recipient (typically, the admin site)
+my @recipients = grep { $_ and $orig ne $_ }
+                 # add localparts to domain
+                 map { my $x = $_;
+                       if ($x =~ /^\@/) {
+                         $x = (defined $local and $local ne '') ? $local.$x : undef;
+                       }
+                       $x
+                     }
+                 @ARGV;
+# Die if we can't deliver to site admins
+die "Error: Aborted delivery to '$orig' in attempt to break an alias expansion loop.\n"
+    unless @recipients;
+
+if (defined $domain) {
+    # Look for the domain owner or postmaster
+    my $ldap = Net::LDAPI::->new();
+    $ldap->bind( undef, sasl => Authen::SASL::->new(mechanism => 'EXTERNAL') )
+        or die "Error: Couldn't bind";
+
+    my @attrs = ( 'fripostPostmaster', 'fripostOwner' );
+    my $mesg = $ldap->search( base => 'fvd='.escape_dn_value($domain).','
+                                     .'ou=virtual,dc=fripost,dc=org'
+                            , scope => 'base'
+                            , deref => 'never'
+                            , filter => '(&(objectClass=FripostVirtualDomain)'
+                                         .'(fvd='.escape_filter_value($domain).')'.
+                                        ')'
+                            , attrs => \@attrs
+                            );
+    if ($mesg->code) {
+        warn "Warning: ".$mesg->error;
+    }
+    elsif ($mesg->count != 1) {
+        # Note: this may happen for "$mydestination", but these mails
+        # are unlikely. We'll get a harmless warning at worst.
+        warn "Warning: Something weird happened when looking up domain '".$domain.
+             "'. Check your ACL.";
+    }
+    else {
+        my $entry = $mesg->pop_entry() // die "Error: Cannot pop entry.";
+        foreach (@attrs) {
+            my $v = $entry->get_value($_, asref => 1) or next;
+            foreach my $dn (@$v) {
+                my $dn2 = ldap_explode_dn($dn, casefold => 'lower');
+                my $l = $dn2->[0]->{fvl};
+                my $d = $dn2->[1]->{fvd};
+                if ($l ne '' and $d ne '') {
+                    push @recipients, $l.'@'.$d;
+                }
+                else {
+                    warn "Warning: Invalid DN: $dn"
+                }
+            }
+        }
+    }
+    $ldap->unbind;
+}
+
+my $smtp = Net::SMTP::->new( 'localhost:25', Timeout => 1200 );
+$smtp->mail($sender);
+$smtp->to(@recipients, { Notify => ['FAILURE','DELAY'], SkipBad => 1 });
+$smtp->data(<STDIN>);
+$smtp->quit;
-- 
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