$Id$
package main;
use strict;
use warnings;
## apt-get install libconvert-base32-perl libauthen-oath-perl libcrypt-urandom-perl
use Convert::Base32;
use Authen::OATH;
use URI::Escape;
use Crypt::URandom qw( urandom );
sub GoogleAuth_Initialize($) {
my ($hash) = @_;
$hash->{DefFn} = "GoogleAuth_Define";
$hash->{UndefFn} = "GoogleAuth_Undefine";
$hash->{DeleteFn} = "GoogleAuth_Delete";
$hash->{SetFn} = "GoogleAuth_Set";
$hash->{GetFn} = "GoogleAuth_Get";
# $hash->{AttrFn} = "GoogleAuth_Attr";
$hash->{AttrList} = "ga_qrsize ".
"$readingFnAttributes";
}
sub GoogleAuth_Define($$) {
my ($hash, $def) = @_;
my $name = $hash->{NAME};
my @a = split("[ \t][ \t]*", $def);
return "Usage: Use Google Authenticator" if(@a != 2);
## ich würde keine Prüfung auf bereits vorhandene GA machen,
## es kann durchaus Fälle geben, in denen man mehr als 1 Schlüssel definieren möchte
# my $d = $modules{$hash->{TYPE}}{defptr};
# return "$hash->{TYPE} device already defined as $d->{NAME}." if( defined($d) );
Log3($hash,4,"googleAuth $name: defined");
readingsSingleUpdate($hash,'state','defined',1);
return undef;
}
sub GoogleAuth_Undefine($$) {
my ($hash, $arg) = @_;
delete $modules{$hash->{TYPE}}{defptr};
return undef;
}
sub GoogleAuth_Delete() {
my ($hash, $arg) = @_;
my $name = $hash->{NAME};
setKeyValue("googleAuth$name",undef);
}
sub GoogleAuth_Set($$@) {
my ($hash, $name, $cmd, @args) = @_;
my $usage = "Unknown argument, choose one of new:noArg";
if($cmd eq "new") {
#SOURCE: https://blog.darkpan.com/article/6/Perl-and-Google-Authenticator.html
my $secret_bytes = urandom(50);
my $secret_base32 = encode_base32( $secret_bytes );
Log3($hash,5,"googleAuth $name: secret_bytes=$secret_bytes");
Log3($hash,5,"googleAuth $name: set secret_base32=$secret_base32");
setKeyValue("googleAuth$name",$secret_base32); # write to fhem keystore
my $label = "FHEM%20Authentication%20$name";
my $qrsize = AttrVal("$name",'ga_qrsize','200x200');
my $url = "otpauth://totp/$label?secret=$secret_base32";
my $qr_url = "https://chart.googleapis.com/chart?cht=qr&chs=$qrsize"."&chl=".uri_escape($url);
readingsSingleUpdate($hash,'qr_url',$qr_url,1);
my $ret = "![](\"$qr_url\")
<\/a>";
return $ret;
;
}
return $usage;
}
sub GoogleAuth_Get($$@) {
my ($hash, $name, $cmd, @args) = @_;
my $usage = "Unknown argument, choose one of check";
if ($cmd eq "check") {
my $given_token = shift @args;
return "Token missing!" unless (defined($given_token) && $given_token);
$given_token = _ga_make_token_6($given_token);
Log3($hash,4,"googleAuth $name: given: $given_token");
my $secret_base32 = getKeyValue("googleAuth$name"); # read from fhem keystore
Log3($hash,5,"googleAuth $name: get secret_base32=$secret_base32");
$secret_base32 = decode_base32($secret_base32);
Log3($hash,5,"googleAuth $name: secret_bytes=$secret_base32");
my $oath = Authen::OATH->new;
my @possible = map { _ga_make_token_6($oath->totp($secret_base32, $_)) } time-30, time, time+30;
Log3($hash,4,"googleAuth $name: possible: ".join ' ',@possible);
my $result = (grep /^$given_token$/, @possible) ? 1 : -1;
Log3($hash,4,"googleAuth $name: result: $result");
return $result;
}
return $usage;
}
sub _ga_make_token_6($) {
my $token = shift;
while (length $token < 6) {
$token = "0$token";
}
return $token;
}
1;
=pod
=item helper
=item summary Module to use GoogleAuthnticator
=item summary_DE Modul zur Nutzung von GoogleAuthenticator
=begin html
GoogleAuthenticator
Module to use GoogleAuthenticator.
=end html
=cut