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package Echolot::Pinger::CPunk;
#
# $Id$
#
# This file is part of Echolot - a Pinger for anonymous remailers.
#
# Copyright (c) 2002, 2003, 2004 Peter Palfrader <peter@palfrader.org>
#
# This program is free software. you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
=pod
=head1 Name
Echolot::Pinger::CPunk - send cypherpunk pings
=head1 DESCRIPTION
This package provides functions for sending cypherpunk (type I) pings.
=cut
use strict;
use English;
use GnuPG::Interface;
use Echolot::Log;
sub encrypt_to($$$$) {
my ($msg, $recipient, $keys, $pgp2compat) = @_;
(defined $keys->{$recipient}) or
Echolot::Log::warn("Key for recipient $recipient is not defined."),
return undef;
(defined $keys->{$recipient}->{'key'}) or
Echolot::Log::warn("Key->key for recipient $recipient is not defined."),
return undef;
my $keyring = Echolot::Config::get()->{'tmpdir'}.'/'.
Echolot::Globals::get()->{'hostname'}.".".time.'.'.$PROCESS_ID.'_'.Echolot::Globals::get()->{'internalcounter'}++.'.keyring';
my $GnuPG = new GnuPG::Interface;
$GnuPG->call( Echolot::Config::get()->{'gnupg'} ) if (Echolot::Config::get()->{'gnupg'});
$GnuPG->options->hash_init(
homedir => Echolot::Config::get()->{'gnupghome'} );
$GnuPG->options->meta_interactive( 0 );
my ( $stdin_fh, $stdout_fh, $stderr_fh, $status_fh, $handles ) = Echolot::Tools::make_gpg_fds();
my $pid = $GnuPG->wrap_call(
commands => [ '--import' ],
command_args => [qw{--no-options --no-secmem-warning --no-default-keyring --fast-list-mode --keyring}, $keyring, '--', '-' ],
handles => $handles );
my ($stdout, $stderr, $status) = Echolot::Tools::readwrite_gpg($keys->{$recipient}->{'key'}, $stdin_fh, $stdout_fh, $stderr_fh, $status_fh);
waitpid $pid, 0;
($stdout eq '') or
Echolot::Log::info("GnuPG returned something in stdout '$stdout' while adding key for '$recipient': So what?");
#($stderr eq '') or
#Echolot::Log::warn("GnuPG returned something in stderr: '$stderr' while adding key for '$recipient'; returning."),
#return undef;
($status =~ /^^\[GNUPG:\] IMPORTED $recipient /m) or
Echolot::Log::info("GnuPG status '$status' didn't indicate key for '$recipient' was imported correctly."),
return undef;
#$msg =~ s/\r?\n/\r\n/g;
$GnuPG->options->hash_init(
armor => 1 );
( $stdin_fh, $stdout_fh, $stderr_fh, $status_fh, $handles ) = Echolot::Tools::make_gpg_fds();
my $command_args = [qw{--no-options --no-secmem-warning --always-trust --no-default-keyring --textmode --cipher-algo 3DES --keyring}, $keyring, '--recipient', $recipient];
my $plaintextfile;
#if ($pgp2compat) {
# push @$command_args, qw{--pgp2};
#};
# Files are required for compaitibility with PGP 2.*
# we also use files in all other cases since there is a bug in either GnuPG or GnuPG::Interface
# that let Echolot die if in certain cases:
# If a key is unuseable because it expired and we want to encrypt something to it
# pingd dies if there is only enough time between calling encrypt() and printing the message
# to GnuPG. (a sleep 1 triggered that reproduceably)
$plaintextfile = Echolot::Config::get()->{'tmpdir'}.'/'.
Echolot::Globals::get()->{'hostname'}.".".time.'.'.$PROCESS_ID.'_'.Echolot::Globals::get()->{'internalcounter'}++.'.plaintext';
open (F, '>'.$plaintextfile) or
Echolot::Log::warn("Cannot open $plaintextfile for writing: $!."),
return 0;
print (F $msg);
close (F) or
Echolot::Log::warn("Cannot close $plaintextfile."),
return 0;
push @$command_args, $plaintextfile;
$pid = $GnuPG->encrypt(
command_args => $command_args,
handles => $handles );
($stdout, $stderr, $status) = Echolot::Tools::readwrite_gpg('', $stdin_fh, $stdout_fh, $stderr_fh, $status_fh);
waitpid $pid, 0;
#($stderr eq '') or
#Echolot::Log::warn("GnuPG returned something in stderr: '$stderr' while encrypting to '$recipient'."),
#return undef;
($status =~ /^\[GNUPG:\] KEYEXPIRED (\d+)/m) and
Echolot::Log::info("Key $recipient expired at ".scalar gmtime($1)." UTC"),
return undef;
(($status =~ /^\[GNUPG:\] BEGIN_ENCRYPTION\s/m) &&
($status =~ /^\[GNUPG:\] END_ENCRYPTION\s/m)) or
Echolot::Log::info("GnuPG status '$status' didn't indicate message to '$recipient' was encrypted correctly (stderr: $stderr; args: ".join(' ', @$command_args).")."),
return undef;
unlink ($keyring) or
Echolot::Log::warn("Cannot unlink tmp keyring '$keyring'."),
return undef;
unlink ($keyring.'~'); # gnupg does those evil backups
(defined $plaintextfile) and
(unlink ($plaintextfile) or
Echolot::Log::warn("Cannot unlink tmp plaintextfile '$plaintextfile'."),
return undef);
my $result;
$plaintextfile .= '.asc';
open (F, '<'.$plaintextfile) or
Echolot::Log::warn("Cannot open $plaintextfile for reading: $!."),
return 0;
$result = join '', <F>;
close (F) or
Echolot::Log::warn("Cannot close $plaintextfile."),
return 0;
(defined $plaintextfile) and
(unlink ($plaintextfile) or
Echolot::Log::warn("Cannot unlink tmp plaintextfile '$plaintextfile'."),
return undef);
$result =~ s,^Version: .*$,Version: N/A,m;
#$result =~ s/\r?\n/\r\n/g;
return $result;
};
sub ping($$$$$) {
my ($body, $to, $with_from, $chain, $keys) = @_;
my $msg = $body;
for my $hop (reverse @$chain) {
my $header = '';
if ($with_from) {
my $address = Echolot::Config::get()->{'my_localpart'} . '@' .
Echolot::Config::get()->{'my_domain'};
$header = "##\nFrom: Echolot Pinger <$address>\n\n";
$with_from = 0;
};
# "Latent-Time: +0\n".
$msg = "::\n".
"Anon-To: $to\n".
"\n".
$header.
$msg;
if ($hop->{'encrypt'}) {
my $encrypted = encrypt_to($msg, $hop->{'keyid'}, $keys, $hop->{'pgp2compat'});
(defined $encrypted) or
Echolot::Log::debug("Encrypted is undefined."),
return undef;
$msg = "::\n".
"Encrypted: PGP\n".
"\n".
$encrypted;
};
$to = $hop->{'address'};
}
Echolot::Tools::send_message(
To => $to,
Body => $msg
);
return 1;
};
1;
# vim: set ts=4 shiftwidth=4:
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