1 # Copyright (C) 2013-2021 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # For the -mda script (mail delivery agent)
5 package PublicInbox::MDA;
8 use PublicInbox::MsgTime;
9 use PublicInbox::Address;
10 use constant MAX_SIZE => 1024 * 500; # same as spamc default, should be tunable
11 use constant MAX_MID_SIZE => 244; # max term size - 1 in Xapian
15 qw(delivered-to x-original-to), # prevent training loops
17 # The rest are taken from Mailman 2.1.15:
18 # could contain passwords:
19 qw(approved approve x-approved x-approve urgent),
20 # could be used phishing:
21 qw(return-receipt-to disposition-notification-to x-confirm-reading-to),
26 # drop plus addressing for matching
29 $str_addr =~ s/\+.*\@/\@/;
33 # do not allow Bcc, only Cc and To if recipient is set
35 my ($klass, $simple, $address) = @_;
36 my @mid = $simple->header('Message-ID');
37 return 0 if scalar(@mid) != 1;
39 return 0 if (length($mid) > MAX_MID_SIZE);
40 return 0 unless usable_str(length('<m@h>'), $mid) && $mid =~ /\@/;
41 return 0 unless usable_str(length('u@h'), $simple->header("From"));
42 return 0 unless usable_str(length(':o'), $simple->header("Subject"));
43 return 0 unless usable_date($simple->header("Date"));
44 return 0 if length($simple->as_string) > MAX_SIZE;
45 alias_specified($simple, $address);
50 defined($str) && length($str) >= $len;
54 defined(eval { PublicInbox::MsgTime::str2date_zone($_[0]) });
58 my ($simple, $address) = @_;
60 my @address = ref($address) eq 'ARRAY' ? @$address : ($address);
62 lc(__drop_plus($_)) => 1;
65 foreach my $line ($simple->header('Cc'), $simple->header('To')) {
66 my @addrs = PublicInbox::Address::emails($line);
67 foreach my $addr (@addrs) {
68 if ($ok{lc(__drop_plus($addr))}) {
76 sub set_list_headers {
77 my ($class, $simple, $dst) = @_;
78 unless (defined $simple->header('List-Id')) {
79 my $pa = $dst->{-primary_address};
80 $pa =~ tr/@/./; # RFC2919
81 $simple->header_set("List-Id", "<$pa>");
85 sub inboxes_for_list_id ($$) {
86 my ($klass, $pi_cfg, $simple) = @_;
88 # newer Email::Simple allows header_raw, as does Email::MIME:
89 my @list_ids = $simple->can('header_raw') ?
90 $simple->header_raw('List-Id') :
91 $simple->header('List-Id');
93 for my $list_id (@list_ids) {
94 $list_id =~ /<[ \t]*(.+)?[ \t]*>/ or next;
95 if (my $ibx = $pi_cfg->lookup_list_id($1)) {
99 if (scalar(@list_ids) > 1) {
100 warn "W: multiple List-IDs in message:\n";
101 warn "W: List-ID: $_\n" for @list_ids