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#!/usr/bin/perl # # 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::Descriptive; use Pod::Usage; my ($opt, $usage) = describe_options( "%c %o < original_email.txt", [ "type=s" => "Determine the desired signature type 'dkim' or 'domainkeys'", {default=>'dkim'} ], [ "algorithm=s" => "Algorithm to sign with", {default=>"rsa-sha256"} ], [ "method=s" => "Specify the desired canonicalization method, Possible values are simple, simple/simple, simple/relaxed, relaxed, relaxed/relaxed, relaxed/simple", {default=>"simple"} ], [ "selector=s" => "Signing selector", {default=>'selector1'} ], [ "domain=s" => "Signing domain" ], [ "expiration=s" => "Optional signature expiration, as delta from current timestamp" ], [ "identity=s" => "Optional identity to use for signing" ], [ "key=s" => "File containing private key, without BEGIN or END lines.", {default=>"private.key"} ], [ "key-protocol=s" => "Optional key protocol to use" ], [ "debug-canonicalization=s" => "Outputs the canonicalized message to the specified file, in addition to computing the DKIM signature. This is helpful for debugging canonicalization methods." ], [ "extra-tag=s@" => "Extra tags to use in signing" ], [ "timestamp=i" => "Timestamp to sign with, defaults to now", {default=>time} ], [ "binary" => "Read input in binary mode" ], [ "help|?" => "Show help" ], {show_defaults=>1}, ); if ($opt->help) { print $usage->text; exit 1; } my $debugfh; if (defined $opt->debug_canonicalization) { open $debugfh, ">", $opt->debug_canonicalization or die "Error: cannot write ".$opt->debug_canonicalization.": $!\n"; } if ($opt->binary) { binmode STDIN; } my $dkim = new Mail::DKIM::Signer( Policy => \&signer_policy, Algorithm => $opt->algorithm, Method => $opt->method, Selector => $opt->selector, KeyFile => $opt->key, Debug_Canonicalization => $debugfh, ); while (<STDIN>) { unless ($opt->binary) { chomp $_; s/\015?$/\015\012/s; } $dkim->PRINT($_); } $dkim->CLOSE; if ($debugfh) { close $debugfh; print STDERR "wrote canonicalized message to ".$opt->debug_canonicalization."\n"; } print $dkim->signature->as_string . "\n"; sub signer_policy { my $dkim = shift; use Mail::DKIM::DkSignature; $dkim->domain($opt->domain || $dkim->message_sender->host); my $class = $opt->type eq "domainkeys" ? "Mail::DKIM::DkSignature" : $opt->type eq "dkim" ? "Mail::DKIM::Signature" : die "unknown signature type '".$opt->type."'\n"; my $timestamp = $opt->timestamp ? $opt->timestamp : time(); my $sig = $class->new( Algorithm => $dkim->algorithm, Method => $dkim->method, Headers => $dkim->headers, Domain => $dkim->domain, Selector => $dkim->selector, defined($opt->timestamp) ? (Timestamp => $opt->expiration) : (), defined($opt->expiration) ? (Expiration => $timestamp + $opt->expiration) : (), defined($opt->identity) ? (Identity => $opt->identity) : (), ); $sig->protocol($opt->key_protocol) if defined $opt->key_protocol; if ($opt->extra_tag) { foreach my $extra ($opt->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 AUTHOR Jason Long, E<lt>jlong@messiah.eduE<gt> Marc Bradshaw, E<lt>marc@marcbradshaw.netE<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