-# Copyright (C) 2013, Eric Wong <normalperson@yhbt.net> and all contributors
+# Copyright (C) 2013-2015 all contributors <meta@public-inbox.org>
# License: AGPLv3 or later (https://www.gnu.org/licenses/agpl-3.0.txt)
+#
+# For the -mda script (mail delivery agent)
package PublicInbox::MDA;
use strict;
use warnings;
-use Email::Address;
-use Encode qw/decode encode/;
+use Email::Simple;
use Date::Parse qw(strptime);
-use constant MAX_SIZE => 1024 * 500; # same as spamc default
-use constant cmd => qw/ssoma-mda -1/;
+use constant MAX_SIZE => 1024 * 500; # same as spamc default, should be tunable
+use constant MAX_MID_SIZE => 244; # max term size - 1 in Xapian
+
+our @BAD_HEADERS = (
+ # postfix
+ qw(delivered-to x-original-to), # prevent training loops
+
+ # The rest are taken from Mailman 2.1.15:
+ # could contain passwords:
+ qw(approved approve x-approved x-approve urgent),
+ # could be used phishing:
+ qw(return-receipt-to disposition-notification-to x-confirm-reading-to),
+ # Pegasus mail:
+ qw(x-pmrqc)
+);
# drop plus addressing for matching
sub __drop_plus {
# do not allow Bcc, only Cc and To if recipient is set
sub precheck {
- my ($klass, $filter, $recipient) = @_;
- my $simple = $filter->simple;
- my $mid = $simple->header("Message-ID");
+ my ($klass, $filter, $address) = @_;
+ my Email::Simple $simple = $filter->simple;
+ my @mid = $simple->header('Message-ID');
+ return 0 if scalar(@mid) != 1;
+ my $mid = $mid[0];
+ return 0 if (length($mid) > MAX_MID_SIZE);
return 0 unless usable_str(length('<m@h>'), $mid) && $mid =~ /\@/;
return 0 unless usable_str(length('u@h'), $filter->from);
return 0 unless usable_str(length(':o'), $simple->header("Subject"));
return 0 unless usable_date($simple->header("Date"));
return 0 if length($simple->as_string) > MAX_SIZE;
- recipient_specified($filter, $recipient);
+ alias_specified($filter, $address);
}
sub usable_str {
scalar @t;
}
-sub recipient_specified {
- my ($filter, $recipient) = @_;
- defined($recipient) or return 1; # for mass imports
- my @recip = Email::Address->parse($recipient);
- my $oaddr = __drop_plus($recip[0]->address);
- $oaddr = qr/\b\Q$oaddr\E\b/i;
- my @to = Email::Address->parse($filter->to);
- my @cc = Email::Address->parse($filter->cc);
- foreach my $addr (@to, @cc) {
- if (__drop_plus($addr->address) =~ $oaddr) {
- return 1;
+sub alias_specified {
+ my ($filter, $address) = @_;
+
+ my @address = ref($address) eq 'ARRAY' ? @$address : ($address);
+ my %ok = map {
+ lc(__drop_plus($_)) => 1;
+ } @address;
+
+ foreach my $line ($filter->cc, $filter->to) {
+ my @addrs = ($line =~ /([^<\s]+\@[^>\s]+)/g);
+ foreach my $addr (@addrs) {
+ if ($ok{lc(__drop_plus($addr))}) {
+ return 1;
+ }
}
}
return 0;
}
-# RFC2919 and RFC2369
sub set_list_headers {
my ($class, $simple, $dst) = @_;
- my $pa = "<$dst->{-primary_address}>";
- $simple->header_set("List-Id", $pa);
- $simple->header_set("List-Post", $pa);
-
- my $url = $dst->{url};
- if (defined $url) {
- $simple->header_set("List-Archive", "<$url>");
- $simple->header_set("List-Help", "<${url}help>");
+ unless (defined $simple->header('List-Id')) {
+ my $pa = $dst->{-primary_address};
+ $simple->header_set("List-Id", "<$pa>"); # RFC2919
}
-}
-
-# returns a 3-element array: name, email, date
-sub author_info {
- my ($class, $simple) = @_;
- my $from = decode('MIME-Header', $simple->header('From'));
- $from = encode('utf8', $from);
- my @from = Email::Address->parse($from);
- my $name = $from[0]->name;
- defined $name or $name = '';
- my $email = $from[0]->address;
- defined $email or $email = '';
- ($name, $email, $simple->header('Date'));
+ $simple->header_set($_) foreach @BAD_HEADERS;
}
1;