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Handler corner case better: signed message relayed by listserv which adds

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Sender: but does not resign message or strip DomainKeys-Signature.  Add
config option to prevent badly signed message from being DENY'd.

git-svn-id: https://svn.perl.org/qpsmtpd/branches/0.3x@654 958fd67b-6ff1-0310-b445-bb7760255be9
This commit is contained in:
John Peacock 2006-07-12 18:10:00 +00:00
parent 66f2f9354b
commit de620a4c22
1 changed files with 36 additions and 30 deletions
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60
plugins/domainkeys
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@ -1,3 +1,11 @@
sub init {
my ($self, %args) = @_;
foreach my $key ( %args ) {
$self->{$key} = $args{$key};
}
}
sub hook_data_post {
use Mail::DomainKeys::Message;
use Mail::DomainKeys::Policy;
@ -35,17 +43,11 @@ sub hook_data_post {
# Don't do anything else
$status = "testing";
}
elsif ( $message->signed ) {
if ( $message->verify ) {
elsif ( $message->signed and $message->verify ) {
# verified: add good header
$status = $message->signature->status;
}
else {
# not verified, i.e. forged signature
$status = undef;
}
}
else { # not signed
else { # not signed or not verified
my $policy = fetch Mail::DomainKeys::Policy(
Protocol => "dns",
Domain => $message->senderdomain
@ -65,44 +67,48 @@ sub hook_data_post {
}
}
else {
$status = "no signature";
$status = $message->signed ? "non-participant" : "no signature";
}
}
if ( defined $status ) {
$transaction->header->replace("DomainKey-Status", $status);
$self->log(LOGWARN, "DomainKeys-Status: $status");
return DECLINED;
}
else {
$self->log(LOGWARN, "DomainKeys signature failed to verify");
$self->log(LOGERROR, "DomainKeys signature failed to verify");
if ( $self->{warn_only} ) {
return DECLINED;
}
else {
return (DENY, "DomainKeys signature failed to verify");
}
}
}
# Leave this in place until Mail::DomainKeys is patched
eval
q/
*Mail::DomainKeys::Message::header = sub {
my $self = shift;
$self->signed or
return new Mail::DomainKeys::Header(
Line => "DomainKey-Status: no signature");
$self->signature->status and
return new Mail::DomainKeys::Header(
Line => "DomainKey-Status: " . $self->signature->status);
};
/
unless Mail::DomainKeys::Message->can('header');
=cut
=head1 NAME
domainkeys: validate a DomainKeys signature on an incoming mail
=head1 SYNOPSIS
domainkeys [warn_only 1]
Performs a DomainKeys validation on the message. Takes a single
configuration
warn_only 1
which means that messages which are not correctly signed (i.e. signed but
modified or deliberately forged) will not be DENY'd, but an error will still
be issued to the logfile.
=head1 COPYRIGHT
Copyright (C) 2005-2006 John Peacock.
Portions Copyright (C) 2004 Anthony D. Urso. All rights reserved. This