/usr/bin/dkimproxy-sign is in libmail-dkim-perl 0.44-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | #!/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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