784 lines
19 KiB
Perl
784 lines
19 KiB
Perl
# ===========================================================================
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# Gpg.pm
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# $Id$
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#
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# Object methods for gpg-ezmlm mailing lists
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#
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# Copyright (C) 2006, Lars Kruse, All Rights Reserved.
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# Please send bug reports and comments to devel@sumpfralle.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#
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# ==========================================================================
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package Mail::Ezmlm::Gpg;
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use strict;
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use vars qw($GPG_BIN $VERSION @ISA @EXPORT @EXPORT_OK);
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use vars qw(@GPG_LIST_OPTIONS);
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use Carp;
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use Crypt::GPG;
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$VERSION = '0.1';
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require 5.005;
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=head1 NAME
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Mail::Ezmlm::Gpg - Object Methods for encrypted Ezmlm Mailing Lists
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=head1 SYNOPSIS
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use Mail::Ezmlm::Gpg;
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$list = new Mail::Ezmlm::Gpg(DIRNAME);
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The rest is a bit complicated for a Synopsis, see the description.
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=head1 DESCRIPTION
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Mail::Ezmlm::Gpg is a Perl module that is designed to provide an object
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interface to encrypted mailing lists based upon gpgpy-ezmlm.
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See the gpgpy-ezmlm web page (https://systemausfall.org/toolforge/gpgpy-ezmlm/)
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for a this software.
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=cut
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# == Begin site dependant variables ==
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$GPG_BIN = '/usr/bin/gpg'; # Autoinserted by Makefile.PL
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# == check the gpg path ==
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$GPG_BIN = '/usr/local/bin/gpg'
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unless (-e "$GPG_BIN");
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$GPG_BIN = '/usr/bin/gpg'
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unless (-e "$GPG_BIN");
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$GPG_BIN = '/bin/gpg'
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unless (-e "$GPG_BIN");
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$GPG_BIN = '/usr/local/bin/gpg2'
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unless (-e "$GPG_BIN");
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$GPG_BIN = '/usr/bin/gpg2'
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unless (-e "$GPG_BIN");
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$GPG_BIN = '/bin/gpg2'
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unless (-e "$GPG_BIN");
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$GPG_BIN = '/usr/local/bin/gpg'
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unless (-e "$GPG_BIN");
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$GPG_BIN = '/bin/gpg'
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unless (-e "$GPG_BIN");
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# == clean up the path for taint checking ==
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local $ENV{'PATH'} = "/bin";
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# == define the available (supported) GPG_LIST_OPTIONS ==
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my %GPGPY_DEFAULT_OPTIONS = (
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"plain_without_key" => 0,
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"sign_messages" => 0,
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"gnupg_dir" => ".gnupg" );
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my $GPGPY_CONF_FILE = 'conf-gpgpy';
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# == Initialiser - Returns a reference to the object ==
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=head2 Setting up a new Ezmlm::Gpg object:
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use Mail::Ezmlm::Gpg;
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$list = new Mail::Ezmlm::Gpg('/home/user/lists/moolist');
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new() returns the value of thislist() for success, undefined if there was a
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problem.
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=cut
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sub new {
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my($class, $list) = @_;
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my $self = {};
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bless $self, ref $class || $class || 'Mail::Ezmlm::Gpg';
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$list =~ m/^([\w\._\/-]*)$/;
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$list = $1;
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$self->setlist($list) if(defined($list) && $list);
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return $self;
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}
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# == convert an existing list to gpg-ezmlm ==
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=head2 Converting a plaintext mailing list to an encrypted list:
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You have to create a normal list before you can convert it.
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Use Mail::Ezmlm to do this.
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$list->enable_encryption();
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=cut
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sub enable_encryption {
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my($self) = @_;
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my $errorstring;
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my $list_dir = $self->{'LIST_NAME'};
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unless (defined($list_dir)) {
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$errorstring = 'must define directory in enable_encrypted()';
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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unless(-d $list_dir) {
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$errorstring = 'directory does not exist: ' . $list_dir;
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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if ($self->is_encrypted()) {
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$errorstring = 'list is already encrypted: ' . $list_dir;
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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# create config file - this enables encryption support
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unless (open(CONFIG_FILE, ">$list_dir/$GPGPY_CONF_FILE")) {
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$errorstring = "failed to create config file: $list_dir/$GPGPY_CONF_FILE";
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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close(CONFIG_FILE);
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# we write the default values to the file - this is easier to read for humans
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return (1==0) unless ($self->update(%GPGPY_DEFAULT_OPTIONS));
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$self->_seterror(undef);
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return (0==0);
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}
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# == convert an encrypted list back to plaintext ==
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=head2 Converting an encryted mailing list to a plaintext list:
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$list->disable_encryption();
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=cut
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sub disable_encryption {
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my($self) = @_;
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my $errorstring;
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my $list_dir = $self->{'LIST_NAME'};
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unless (defined($list_dir)) {
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$errorstring = 'must define directory in disable_encrypted()';
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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unless(-d $list_dir) {
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$errorstring = 'directory does not exist: ' . $list_dir;
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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unless ($self->is_encrypted()) {
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$errorstring = 'list is not encrypted: ' . $list_dir;
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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unless (unlink("$list_dir/$GPGPY_CONF_FILE")) {
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$errorstring = "failed to remove config file: $list_dir/$GPGPY_CONF_FILE";
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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$self->_seterror(undef);
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return (0==0);
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}
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# == Update the current list ==
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=head2 Updating the configuration of the current list:
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$list->update({ 'allowKeySubmission' => 1 });
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=cut
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sub update {
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my($self, %switches) = @_;
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my %ok_switches;
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my ($one_key, $ok_key, $errorstring);
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# check for important files: 'conf-gpgpy'
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unless ((-e "$self->{'LIST_NAME'}/config") || (-e "$self->{'LIST_NAME'}/lock")) {
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$errorstring = "$self->{'LIST_NAME'} does not appear to be a valid list in update()";
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (0==1);
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}
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# check if all supplied settings are supported
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# btw we change the case (upper/lower) of the setting to the default one
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foreach $one_key (keys %switches) {
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foreach $ok_key (keys %GPGPY_DEFAULT_OPTIONS) {
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if ($ok_key =~ /^$one_key$/i) {
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$ok_switches{$ok_key} = $switches{$one_key};
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delete $switches{$one_key};
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}
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}
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}
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# %switches should be empty now
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if (%switches) {
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foreach $one_key (keys %switches) {
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warn "unsupported setting: $one_key";
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}
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}
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my $config_file_old = "$self->{'LIST_NAME'}/$GPGPY_CONF_FILE";
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my $config_file_new = "$self->{'LIST_NAME'}/$GPGPY_CONF_FILE.new";
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if(open(CONFIG_OLD, "<$config_file_old")) {
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if(open(CONFIG_NEW, ">$config_file_new")) {
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my ($in_line, $one_opt, $one_val, $new_setting);
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while (<CONFIG_OLD>) {
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$in_line = $_;
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if (%ok_switches) {
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my $found = 0;
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while (($one_opt, $one_val) = each(%ok_switches)) {
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# is this the right line (maybe commented out)?
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if ($in_line =~ m/^#?\w*$one_opt/i) {
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print CONFIG_NEW "$one_opt = ";
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if ($one_opt eq "gnupg_dir") {
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print CONFIG_NEW $one_val;
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} else {
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print CONFIG_NEW ($one_val)? "yes" : "no";
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}
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print CONFIG_NEW "\n";
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delete $ok_switches{$one_opt};
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$found = 1;
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}
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}
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print CONFIG_NEW $in_line if ($found == 0);
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} else {
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# just print the remaining config file if no other settings are left
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print CONFIG_NEW $in_line;
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}
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}
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# write the remaining settings to the end of the file
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while (($one_opt, $one_val) = each(%ok_switches)) {
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print CONFIG_NEW "\n$one_opt = ";
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# is this a non-boolean setting?
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if ($one_opt eq "gnupg_dir") {
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print CONFIG_NEW $one_val;
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} else {
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print CONFIG_NEW ($one_val)? "yes" : "no";
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}
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print CONFIG_NEW "\n";
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}
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} else {
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$errorstring = "failed to write to temporary config file: $config_file_new";
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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close CONFIG_OLD;
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return (1==0);
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}
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close CONFIG_NEW;
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} else {
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$errorstring = "failed to read the config file: $config_file_old";
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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close CONFIG_OLD;
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unless (rename($config_file_new, $config_file_old)) {
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$errorstring = "failed to move new config file ($config_file_new) "
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. "to original config file ($config_file_old)";
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$self->_seterror(-1, $errorstring);
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warn $errorstring;
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return (1==0);
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}
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$self->_seterror(undef);
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return (0==0);
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}
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# == Get a list of options for the current list ==
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=head2 Getting the current configuration of the current list:
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$list->getconfig;
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getconfig() returns a hash including all available settings
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(undefined settings are returned with their default value).
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=cut
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sub getconfig {
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my($self) = @_;
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my(%options, $key);
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foreach $key (keys %GPGPY_DEFAULT_OPTIONS) {
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$options{$key} = $GPGPY_DEFAULT_OPTIONS{$key};
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}
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# Read the config file
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if(open(CONFIG, "<$self->{'LIST_NAME'}/$GPGPY_CONF_FILE")) {
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# 'conf-gpgpy' contains the authorative information
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while(<CONFIG>) {
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if (/^(\w+)\s*=\s*(.*)$/) {
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my $optname = $1;
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my $optvalue = $2;
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my $one_opt;
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foreach $one_opt (keys %GPGPY_DEFAULT_OPTIONS) {
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if ($one_opt =~ m/^$optname$/i) {
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if ($optname ne 'gnupg_dir') {
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# 'gnupg_dir' is the only non-boolean setting
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if ($optvalue =~ /^yes$/i) {
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$options{$one_opt} = 1;
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} else {
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$options{$one_opt} = 0;
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}
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}
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}
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}
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}
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}
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close CONFIG;
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} else {
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$self->_seterror(-1, 'unable to read configuration file in getconfig()' && return undef);
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}
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$self->_seterror(undef);
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return %options;
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}
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# == Return the directory of the gnupg keyring of the current list ==
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=head2 Retrieving the directory of the gnupg keyring of the current list
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$print $list->get_gnupg_dir();
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=cut
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sub get_gnupg_dir {
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my ($self) = shift;
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my %config = $self->getconfig();
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my $setting = $config{"gnupg_dir"};
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$self->_seterror(undef);
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# prefix the directory with the list directory if the directory is not absolute
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if (substr($setting, 0, 1) eq "~") {
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# nothing to be done - the "system" call for gpg will expand it via shell
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return $setting;
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} elsif (substr($setting, 0, 1) eq "/") {
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# absolute path - this is ok, too
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return $setting;
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} else {
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return $self->{'LIST_NAME'} . '/' . $setting;
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}
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}
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# == Return the directory of the current list ==
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=head2 Determining which list we are currently altering:
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$whichlist = $list->thislist;
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print $list->thislist;
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=cut
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sub thislist {
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my($self) = shift;
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$self->_seterror(undef);
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return $self->{'LIST_NAME'};
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}
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# == Set the current mailing list ==
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=head2 Changing which list the Mail::Ezmlm::Gpg object points at:
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$list->setlist('/home/user/lists/moolist');
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=cut
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sub setlist {
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my($self, $list) = @_;
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if ($list =~ m/^([\w\d\_\-\.\/]+)$/) {
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$list = $1;
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if (-e "$list/lock") {
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# it is an ezmlm list
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# it is not necessary, that it is an encrypted list
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$self->_seterror(undef);
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return $self->{'LIST_NAME'} = $list;
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} else {
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# not an ezmlm list
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$self->_seterror(-1, "$list does not appear to be a valid list in setlist()");
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return undef;
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}
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} else {
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# invalid characters
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$self->_seterror(-1, "$list contains tainted data in setlist()");
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return undef;
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}
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}
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# == is the list encrypted? ==
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=head2 Checking the state of a list:
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To determine, if a list is encrypted or not, call is_encrypted().
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$list->is_encrypted();
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=cut
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sub is_encrypted {
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my($self) = @_;
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($self->_seterror(-1, 'must setlist() before is_encrypted()') && return 0) unless(defined($self->{'LIST_NAME'}));
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$self->_seterror(undef);
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if (-e "$self->{'LIST_NAME'}/$GPGPY_CONF_FILE") {
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return (0==0);
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} else {
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return (1==0);
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}
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}
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# == export a key ==
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=head2 Export a key:
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You may export public keys of the keyring of a list.
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The key can be identified by its id or other (unique) patterns (like the
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gnupg program).
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$list->export_key($key_id);
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$list->export_key($email_address);
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The return value is a string containing the ascii armored key data.
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=cut
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sub export_key {
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my ($self, $keyid) = @_;
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my $gpg = $self->_get_gpg_object();
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my $gpgoption = "--armor --export $keyid";
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my $gpgcommand = $gpg->gpgbin() . " " . $gpg->gpgopts() . " $gpgoption";
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my $output = `$gpgcommand 2>/dev/null`;
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if ($output) {
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return $output;
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} else {
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return undef;
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}
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}
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# == import a new key ==
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=head2 Import a key:
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You can import public or secret keys into the keyring of the list.
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The key should be ascii armored.
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$list->import_key($ascii_armored_key_date);
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=cut
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sub import_key {
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my ($self, $key) = @_;
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my $gpg = $self->_get_gpg_object();
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if ($gpg->addkey($key)) {
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return (0==0);
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} else {
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return (1==0);
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}
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}
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# == delete a key ==
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=head2 Delete a key:
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Remove a public key (and the matching secret key if it exists) from the keyring
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of the list.
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The argument is the id of the key or any other unique pattern.
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$list->delete_key($keyid);
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=cut
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sub delete_key {
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my ($self, $keyid) = @_;
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my $gpg = $self->_get_gpg_object();
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my $fprint = $self->_get_fingerprint($keyid);
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return (1==0) unless (defined($fprint));
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my $gpgoption = "--delete-secret-and-public-key $fprint";
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my $gpgcommand = $gpg->gpgbin() . " " . $gpg->gpgopts() . " $gpgoption";
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if (system($gpgcommand)) {
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return (1==0);
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} else {
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return (0==0);
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}
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}
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# == generate new private key ==
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|
|
=head2 Generate a new key:
|
|
|
|
$list->generate_key($name, $comment, $email_address, $keysize, $expire);
|
|
|
|
Refer to the documentation of gnupg for the format of the arguments.
|
|
https://www.gnupg.org/documentation/manuals/gnupg-devel/Unattended-GPG-key-generation.html
|
|
|
|
=cut
|
|
|
|
sub generate_private_key {
|
|
my ($self, $name, $comment, $email, $keysize, $expire) = @_;
|
|
my $gpg = $self->_get_gpg_object();
|
|
my $gpgoption = "--gen-key";
|
|
my $gpgcommand = $gpg->gpgbin() . " " . $gpg->gpgopts() . " $gpgoption";
|
|
my $pid = open(INPUT, "| $gpgcommand");
|
|
print INPUT "Key-Type: default\n";
|
|
print INPUT "Key-Length: 4096\n";
|
|
print INPUT "Subkey-Type: default\n";
|
|
print INPUT "Subkey-Length: $keysize\n";
|
|
print INPUT "Name-Real: $name\n";
|
|
print INPUT "Name-Comment: $comment\n" if ($comment);
|
|
print INPUT "Name-Email: $email\n";
|
|
print INPUT "Expire-Date: $expire\n";
|
|
return close INPUT;
|
|
}
|
|
|
|
|
|
# == get_public_keys ==
|
|
|
|
=head2 Getting public keys:
|
|
|
|
Return an array of key hashes each containing the following elements:
|
|
|
|
=over
|
|
|
|
=item *
|
|
name
|
|
|
|
=item *
|
|
email
|
|
|
|
=item *
|
|
id
|
|
|
|
=item *
|
|
expires
|
|
|
|
=back
|
|
|
|
$list->get_public_keys();
|
|
$list->get_secret_keys();
|
|
|
|
=cut
|
|
|
|
sub get_public_keys {
|
|
my ($self) = @_;
|
|
my @keys = $self->_get_keys("pub");
|
|
return @keys;
|
|
}
|
|
|
|
|
|
# == get_private_keys ==
|
|
# see above for POD (get_public_keys)
|
|
sub get_secret_keys {
|
|
my ($self) = @_;
|
|
my @keys = $self->_get_keys("sec");
|
|
return @keys;
|
|
}
|
|
|
|
|
|
############ some internal functions ##############
|
|
|
|
# == internal function for creating a gpg object ==
|
|
sub _get_gpg_object() {
|
|
my ($self) = @_;
|
|
my $gpg = new Crypt::GPG();
|
|
my $dirname = $self->get_gnupg_dir();
|
|
# fix spaces in filename
|
|
$dirname =~ s/ /\\ /g;
|
|
$gpg->gpgbin($GPG_BIN);
|
|
$gpg->gpgopts("--lock-multiple --no-tty --no-secmem-warning --batch --quiet --homedir $dirname");
|
|
return $gpg;
|
|
}
|
|
|
|
|
|
# == internal function to list keys ==
|
|
sub _get_keys() {
|
|
# type can be "pub" or "sec"
|
|
my ($self, $keyType) = @_;
|
|
my $gpg = $self->_get_gpg_object();
|
|
my ($flag, $gpgoption, @keys, $key);
|
|
if ($keyType eq "pub") {
|
|
$flag = "pub";
|
|
$gpgoption = "--list-keys";
|
|
} elsif ($keyType eq "sec") {
|
|
$flag = "sec";
|
|
$gpgoption = "--list-secret-keys";
|
|
} else {
|
|
warn "wrong keyType: $keyType";
|
|
return undef;
|
|
}
|
|
my $gpgcommand = $gpg->gpgbin() . " " . $gpg->gpgopts() . " --with-colons $gpgoption";
|
|
my @read_keys = grep /^$flag/, `$gpgcommand`;
|
|
foreach $key (@read_keys) {
|
|
my ($type, $trust, $size, $algorithm, $id, $created,
|
|
$expires, $u2, $ownertrust, $uid) = split ":", $key;
|
|
# stupid way of "decoding" utf8 (at least it works for ":")
|
|
$uid =~ s/\\x3a/:/g;
|
|
$uid =~ /^(.*) <([^<]*)>/;
|
|
my $name = $1;
|
|
my $email = $2;
|
|
push @keys, {name => $name, email => $email, id => $id, expires => $expires};
|
|
}
|
|
return @keys;
|
|
}
|
|
|
|
|
|
# == internal function to retrieve the fingerprint of a key ==
|
|
sub _get_fingerprint()
|
|
{
|
|
my ($self, $key_id) = @_;
|
|
my $gpg = $self->_get_gpg_object();
|
|
$key_id =~ /^([0-9A-Z]*)$/;
|
|
$key_id = $1;
|
|
return undef unless ($key_id);
|
|
my $gpgoption = "--fingerprint $key_id";
|
|
|
|
my $gpgcommand = $gpg->gpgbin() . " " . $gpg->gpgopts() . " --with-colons $gpgoption";
|
|
|
|
my @fingerprints = grep /^fpr:/, `$gpgcommand`;
|
|
if (@fingerprints > 1) {
|
|
warn "[Mail::Ezmlm::Gpg] more than one key matched ($key_id)!";
|
|
return undef;
|
|
}
|
|
return undef if (@fingerprints < 1);
|
|
my $fpr = $fingerprints[0];
|
|
$fpr =~ /^fpr:*([0-9A-Z]*):*$/;
|
|
$fpr = $1;
|
|
return undef unless $1;
|
|
return $1;
|
|
}
|
|
|
|
|
|
# == return an error message if appropriate ==
|
|
sub errmsg {
|
|
my($self) = @_;
|
|
return $self->{'ERRMSG'};
|
|
}
|
|
|
|
sub errno {
|
|
my($self) = @_;
|
|
return $self->{'ERRNO'};
|
|
}
|
|
|
|
|
|
# == Internal function to set the error to return ==
|
|
sub _seterror {
|
|
my($self, $no, $mesg) = @_;
|
|
|
|
if(defined($no) && $no) {
|
|
if($no < 0) {
|
|
$self->{'ERRNO'} = -1;
|
|
$self->{'ERRMSG'} = $mesg || 'An undefined error occoured';
|
|
} else {
|
|
$self->{'ERRNO'} = $no / 256;
|
|
$self->{'ERRMSG'} = $! || $mesg || 'An undefined error occoured in a system() call';
|
|
}
|
|
} else {
|
|
$self->{'ERRNO'} = 0;
|
|
$self->{'ERRMSG'} = undef;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
# == Internal function to test for valid email addresses ==
|
|
sub _checkaddress {
|
|
my($self, $address) = @_;
|
|
return 1 unless defined($address);
|
|
return 0 unless ($address =~ m/^(\S+\@\S+\.\S+)$/);
|
|
$_[1] = $1;
|
|
return 1;
|
|
}
|
|
|
|
|
|
1;
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
All of the routines described above have return values. 0 or undefined are
|
|
used to indicate that an error of some form has occoured, while anything
|
|
>0 (including strings, etc) are used to indicate success.
|
|
|
|
If an error is encountered, the functions
|
|
|
|
$list->errno();
|
|
$list->errmsg();
|
|
|
|
can be used to determine what the error was.
|
|
|
|
errno() returns; 0 or undef if there was no error.
|
|
-1 for an error relating to this module.
|
|
>0 exit value of the last system() call.
|
|
|
|
errmsg() returns a string containing a description of the error ($! if it
|
|
was from a system() call). If there is no error, it returns undef.
|
|
|
|
For those who are interested, in those sub routines that have to make system
|
|
calls to perform their function, an undefined value indicates that the
|
|
system call failed, while 0 indicates some other error. Things that you would
|
|
expect to return a string (such as thislist()) return undefined to indicate
|
|
that they haven't a clue ... as opposed to the empty string which would mean
|
|
that they know about nothing :)
|
|
|
|
=head1 AUTHOR
|
|
|
|
Lars Kruse <devel@sumpfralle.de>
|
|
|
|
=head1 BUGS
|
|
|
|
There are no known bugs.
|
|
|
|
Please report bugs to the author or use the bug tracking system at
|
|
https://systemausfall.org/trac/ezmlm-web.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
ezmlm(5), ezmlm-make(2), ezmlm-sub(1),
|
|
ezmlm-unsub(1), ezmlm-list(1), ezmlm-issub(1)
|
|
|
|
https://systemausfall.org/toolforge/ezmlm-web/
|
|
http://www.synacklabs.net/projects/crypt-ml/
|
|
http://www.ezmlm.org/
|
|
http://www.qmail.org/
|
|
|
|
=cut
|