-# Copyright (C) 2013, Eric Wong <normalperson@yhbt.net> and all contributors
-# License: AGPLv3 or later (https://www.gnu.org/licenses/agpl-3.0.txt)
+# Copyright (C) 2013-2020 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <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/;
-use Date::Parse qw(strptime);
-use constant MAX_SIZE => 1024 * 500; # same as spamc default
-use constant cmd => qw/ssoma-mda -1/;
+use Email::Simple;
+use PublicInbox::MsgTime;
+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, $address) = @_;
- my $simple = $filter->simple;
- my $mid = $simple->header("Message-ID");
+ my ($klass, $simple, $address) = @_;
+ 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('u@h'), $simple->header("From"));
return 0 unless usable_str(length(':o'), $simple->header("Subject"));
return 0 unless usable_date($simple->header("Date"));
return 0 if length($simple->as_string) > MAX_SIZE;
- alias_specified($filter, $address);
+ alias_specified($simple, $address);
}
sub usable_str {
}
sub usable_date {
- my @t = eval { strptime(@_) };
- scalar @t;
+ defined(eval { PublicInbox::MsgTime::str2date_zone($_[0]) });
}
sub alias_specified {
- my ($filter, $address) = @_;
+ my ($simple, $address) = @_;
my @address = ref($address) eq 'ARRAY' ? @$address : ($address);
my %ok = map {
- my @recip = Email::Address->parse($_);
- lc(__drop_plus($recip[0]->address)) => 1;
+ lc(__drop_plus($_)) => 1;
} @address;
- foreach my $line ($filter->cc, $filter->to) {
- foreach my $addr (Email::Address->parse($line)) {
- if ($ok{lc(__drop_plus($addr->address))}) {
+ foreach my $line ($simple->header('Cc'), $simple->header('To')) {
+ my @addrs = ($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};
+ $pa =~ tr/@/./; # RFC2919
+ $simple->header_set("List-Id", "<$pa>");
}
}
-# returns a 3-element array: name, email, date
-sub author_info {
- my ($class, $mime) = @_;
+sub inboxes_for_list_id ($$) {
+ my ($klass, $config, $simple) = @_;
- my $from = $mime->header('From');
- my @from = Email::Address->parse($from);
- my $name = $from[0]->name;
- defined $name or $name = '';
- my $email = $from[0]->address;
- defined $email or $email = '';
- ($name, $email, $mime->header('Date'));
+ # newer Email::Simple allows header_raw, as does Email::MIME:
+ my @list_ids = $simple->can('header_raw') ?
+ $simple->header_raw('List-Id') :
+ $simple->header('List-Id');
+ my @dests;
+ for my $list_id (@list_ids) {
+ $list_id =~ /<[ \t]*(.+)?[ \t]*>/ or next;
+ if (my $ibx = $config->lookup_list_id($1)) {
+ push @dests, $ibx;
+ }
+ }
+ if (scalar(@list_ids) > 1) {
+ warn "W: multiple List-IDs in message:\n";
+ warn "W: List-ID: $_\n" for @list_ids
+ }
+ \@dests;
}
1;