Cancel-Lock
Vorrausetzung man hat einen Newsreader der eigene Header unterstützt und man kennt die Message-ID die man verwendet. Sprich man verwendet eigene Message-IDs und weiss vor dem Versenden, wie die lautet.
#!/usr/bin/perl
#
# @AUTHOR Arnold Schiller
# @VERSION 0.3
# @DATE 2007-07-05
#
# makecanlock for usenet messages
#
# 2007-07-07: add generate message-id
# change switch -C to S/s for secret
#
use strict;
use warnings;
my $VERSION = '0.3';
my $pname = $0;
my $version = "$pname.$VERSION";
if (! eval ( "require 'Getopt/Std.pm';" ) ) {
print "$pname: Perl module Getopt/Std.pm not found. Please update your perl ";
print "$pname: installation!\n";
exit 1;
}else {
use Getopt::Std;
}
if (! eval ( "require 'MIME/Base64.pm';" ) ) {
print "$pname: Perl module MIME/Base64.pm not found";
exit 1;
}else{
use MIME::Base64;
}
if (! eval ( "require 'Digest/HMAC_SHA1.pm';" ) ) {
print "$pname: Perl module Digest/HMAC_SHA1.pm not found";
exit 1;
}else{
use Digest::HMAC_SHA1;
}
if (! eval ( "require 'Digest/SHA1.pm';" ) ) {
print "$pname: Perl module Digest/SHA1.pm not found";
exit 1;
}else{
use Digest::SHA1;
}
$Getopt::Std::STANDARD_HELP_VERSION = 1;
$Getopt::Std::OUTPUT_HELP_VERSION = 1;
my $help = '
syntax: '.$pname.' [-Mm] <messageid> [-Uu] <user> [-Ss] <secret> [-V] <integer> [-Dd] <integer>
-U/u Userkey sets userkey/identity
-M/m Message-id messeage-id
-S/s Secret password for Cancelkey
-C/c Control 1 for print Cancelcontrol
-V Verify 1 for print verify
--help
prints this help text and exits: invoking the help
argument causes all other arguments to be discarded by
this utility
--version
description: This utility takes strings as arguments and
produces the Cancel-Lock and the Cancel-Key from the given
arguments as SHA1-Key-Values.
credits: Arnold Schiller (author)
license: This software is licensed GPL. See the
webpage at http://www.gnu.org/copyleft/gpl.html for licensing details.
';
# Some variables
my $user = ''; # -U/-u user/identy
my $CANCELLOCK = ''; # -S/-s secret for Cancel-Key/Lock
# standard usenet header INN-style
my %hdr;
$hdr{'Message-ID'} = ''; # -M/-m Message-ID
$hdr{'Cancel-Lock'} = ''; # sha1:$lock
$hdr{'Cancel-Key'} = ''; # sha1:digest
$hdr{'Control'} = 'cancel ';
#
my $lock = ''; # the sha lockkey
my $data = ''; # data for key-generation
my $digest = ''; # the sha cancelkey
my $key = ''; # for verify
our($opt_U,$opt_u,$opt_M,$opt_m,$opt_S,$opt_s,$opt_C,$opt_c,$opt_V,$opt_v,$opt_H,$opt_h,$opt_D,$opt_d);
&getopts('U:u:M:m:S:s:C:c:V:v:H:h:D:d');
#############################################################
# H e l p
#############################################################
sub HELP_MESSAGE(){
my $h = $help;
print $help;
exit 0;
}
sub HELP_VERSION(){
print $version;
exit 0;
}
#############################################################
# D e b u g
#############################################################
sub debug() {
print STDERR " $_ \n";
print "\n";
}
#############################################################
# Message-ID mit oder ohne Klammer ?
#############################################################
sub data_klammern{
# my $line = $hdr{'Message-ID'};
my $line = $_[0];
if ( $line =~ m/\s*</i ) {
$line = "".$line."";
return($line);
}else{
$line = "<".$line.">"."";
return($line);
}
exit 2;
}
sub make_mid(){
chomp (my $hname = `hostname`);
my ($hostname,) = gethostbyname($hname);
my @CHARS = ('A'..'Z','a'..'z',0..9,'$');
my $unique_value = 0;
my $length = 5;
$length = rand(12) until $length > 5;
my $userpart = join '', (map $CHARS[rand $#CHARS], 0 .. $length), $unique_value++;
my $mid = "<$userpart".time.'@'.$hostname.">";
return $mid;
}
#-----------------------------------------------------
#
# M a i n
#
#-----------------------------------------------------
if(!$opt_v){
$opt_v = 0;
}
if(!$opt_V){
$opt_V = 0;
}
if (($opt_H) or ($opt_h)){
HELP_MESSAGE;
}
if(($opt_U) or ($opt_u)){
if($opt_u){
$user = "$opt_u";
}else{
$user = "$opt_U";
}
}
if(($opt_M) or ($opt_m)){
if($opt_m){
$hdr{'Message-ID'} = $opt_m;
}else{
$hdr{'Message-ID'} = $opt_M;
}
$hdr{'Message-ID'} = data_klammern($hdr{'Message-ID'});
}
if(($opt_S) or ($opt_s)){
if($opt_s) {
$CANCELLOCK = $opt_s;
}else{
$CANCELLOCK = $opt_S;
}
}
if($user eq ''){
print "Userkey and Message-ID needed!";
HELP_MESSAGE();
exit 2;
}
my $hmac = Digest::HMAC_SHA1->new("$user");
if($hdr{'Message-ID'} eq ''){
if($opt_v > 0){
print "No Message-ID! I make one.\n";
}
my $mid = make_mid;
$hdr{'Message-ID'} = $mid;
}
if($CANCELLOCK eq ''){
if($opt_v >= 0) {
print "No Secret given!\n"
}
}
if(($opt_c) or ($opt_C)){
$hdr{'Control'} = "cancel ".$hdr{'Message-ID'};
if($opt_v > 2){
print $hdr{'Control'}."\n";
}else{
print "Control: ".$hdr{'Control'}."\n";
}
}
$data = "$hdr{'Message-ID'}"."$CANCELLOCK";
if($opt_v > 2){
print $hdr{'Message-ID'}."\n";
}else{
print "Message-ID: $hdr{'Message-ID'}";
print "\n";
}
$hmac->add("$data");
$digest = $hmac->b64digest;
$lock = encode_base64(Digest::SHA1::sha1($digest),"");
if($opt_v > 2){
print $lock."\n";
}else{
$hdr{'Cancel-Lock'} = "sha1:".$lock."";
print "Cancel-Lock: ";
print $hdr{'Cancel-Lock'};
print "\n";
}
$hmac = Digest::HMAC_SHA1->new("$user");
$data = $hdr{'Message-ID'}."$CANCELLOCK";
$hmac->add($data);
$digest = $hmac->b64digest;
if($opt_v > 2){
print $digest."\n";
}else{
$hdr{'Cancel-key'} = "sha1:".$digest;
print "Cancel-Key: ";
print $hdr{'Cancel-key'};
print "\n";
}
if($opt_V){
$key = $digest;
$key = Digest::SHA1::sha1($digest);
$key = encode_base64($key);
if($opt_v > 2){
print $key."\n";
}else{
print "$digest match $key";
print "\n";
}
}
exit 0;