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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::Verifier;
use Getopt::Long;
my $debug_canonicalization;
GetOptions(
"debug-canonicalization=s" => \$debug_canonicalization,
)
or die "Error: invalid argument(s)\n";
my $debugfh;
if (defined $debug_canonicalization)
{
open $debugfh, ">", $debug_canonicalization
or die "Error: cannot write to $debug_canonicalization: $!\n";
}
# recommended, but may cause compatibility problems with old firewalls
Mail::DKIM::DNS::enable_EDNS0;
my $dkim = new Mail::DKIM::Verifier(
Debug_Canonicalization => $debugfh,
);
while (<STDIN>)
{
chomp;
s/\015$//;
$dkim->PRINT("$_\015\012");
}
$dkim->CLOSE;
if ($debugfh)
{
close $debugfh;
print STDERR "wrong canonicalized message to $debug_canonicalization\n";
}
print "originator address: " . $dkim->message_originator->address . "\n";
foreach my $signature ($dkim->signatures)
{
print "signature identity: " . $signature->identity . "\n";
print "verify result: " . $signature->result_detail . "\n";
}
foreach my $policy ($dkim->policies)
{
my $policy_name = $policy->name;
print "$policy_name policy result: ";
my $policy_result = $policy->apply($dkim);
print "$policy_result\n";
}
__END__
=head1 NAME
dkimverify.pl - verifies DKIM signatures on an email message
=head1 SYNOPSIS
dkimverify.pl [options] < signed_email.txt
options:
--debug-canonicalization=FILE
dkimverify.pl --help
to see a full description of the various options
=head1 OPTIONS
=over
=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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