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#!/usr/bin/perl -I../lib
#
# Copyright (c) 2005-2007 Messiah College. This program is free software.
# You can redistribute it and/or modify it under the terms of the
# GNU Public License as found at http://www.fsf.org/copyleft/gpl.html.
#
# Written by Jason Long, jlong@messiah.edu.
use strict;
use warnings;
use Mail::DKIM::Signer;
use Mail::DKIM::TextWrap;
use Getopt::Long;
use Pod::Usage;
my $type = "dkim";
my $selector = "selector1";
my $algorithm = "rsa-sha1";
my $method = "simple";
my $domain; # undef => auto-select domain
my $expiration;
my $identity;
my $key_file = "private.key";
my $key_protocol;
my @extra_tag;
my $debug_canonicalization;
my $binary;
my $help;
GetOptions(
"type=s" => \$type,
"algorithm=s" => \$algorithm,
"method=s" => \$method,
"selector=s" => \$selector,
"domain=s" => \$domain,
"expiration=i" => \$expiration,
"identity=s" => \$identity,
"key=s" => \$key_file,
"key-protocol=s" => \$key_protocol,
"debug-canonicalization=s" => \$debug_canonicalization,
"extra-tag=s" => \@extra_tag,
"binary" => \$binary,
"help|?" => \$help,
)
or pod2usage(2);
pod2usage(1) if $help;
pod2usage("Error: unrecognized argument(s)")
unless (@ARGV == 0);
my $debugfh;
if (defined $debug_canonicalization)
{
open $debugfh, ">", $debug_canonicalization
or die "Error: cannot write $debug_canonicalization: $!\n";
}
if ($binary)
{
binmode STDIN;
}
my $dkim = new Mail::DKIM::Signer(
Policy => \&signer_policy,
Algorithm => $algorithm,
Method => $method,
Selector => $selector,
KeyFile => $key_file,
Debug_Canonicalization => $debugfh,
);
while (<STDIN>)
{
unless ($binary)
{
chomp $_;
s/\015?$/\015\012/s;
}
$dkim->PRINT($_);
}
$dkim->CLOSE;
if ($debugfh)
{
close $debugfh;
print STDERR "wrote canonicalized message to $debug_canonicalization\n";
}
print $dkim->signature->as_string . "\n";
sub signer_policy
{
my $dkim = shift;
use Mail::DKIM::DkSignature;
$dkim->domain($domain || $dkim->message_sender->host);
my $class = $type eq "domainkeys" ? "Mail::DKIM::DkSignature" :
$type eq "dkim" ? "Mail::DKIM::Signature" :
die "unknown signature type '$type'\n";
my $sig = $class->new(
Algorithm => $dkim->algorithm,
Method => $dkim->method,
Headers => $dkim->headers,
Domain => $dkim->domain,
Selector => $dkim->selector,
defined($expiration) ? (Expiration => time() + $expiration) : (),
defined($identity) ? (Identity => $identity) : (),
);
$sig->protocol($key_protocol) if defined $key_protocol;
foreach my $extra (@extra_tag)
{
my ($n, $v) = split /=/, $extra, 2;
$sig->set_tag($n, $v);
}
$dkim->add_signature($sig);
return;
}
__END__
=head1 NAME
dkimsign.pl - computes a DKIM signature for an email message
=head1 SYNOPSIS
dkimsign.pl [options] < original_email.txt
options:
--type=TYPE
--method=METHOD
--selector=SELECTOR
--expiration=INTEGER
--debug-canonicalization=FILE
dkimsign.pl --help
to see a full description of the various options
=head1 OPTIONS
=over
=item B<--expiration>
Optional. Specify the desired signature expiration, as a delta
from the signature timestamp.
=item B<--type>
Determines the desired signature. Use dkim for a DKIM-Signature, or
domainkeys for a DomainKey-Signature.
=item B<--method>
Determines the desired canonicalization method. Possible values are
simple, simple/simple, simple/relaxed, relaxed, relaxed/relaxed,
relaxed/simple.
=item B<--debug-canonicalization>
Outputs the canonicalized message to the specified file, in addition
to computing the DKIM signature. This is helpful for debugging
canonicalization methods.
=back
=head1 AUTHOR
Jason Long, E<lt>jlong@messiah.eduE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2006-2007 by Messiah College
This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.6 or,
at your option, any later version of Perl 5 you may have available.
=cut
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