98_GoogleAuth.pm: under development

git-svn-id: https://svn.fhem.de/fhem/trunk@13073 2b470e98-0d58-463d-a4d8-8e2adae1ed80
2025-04-29 17:37:09 +00:00 · 2017-01-14 23:16:08 +00:00 · 2017-01-14 23:16:08 +00:00 · 393b768687
commit 393b768687
parent 59a3946547
1 changed files with 134 additions and 0 deletions
--- a/fhem/contrib/98_GoogleAuth.pm
+++ b/fhem/contrib/98_GoogleAuth.pm
@ -0,0 +1,134 @@
+$Id$
+
+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($$@) {
+  my ($hash, $name, $cmd, @args) = @_;
+  my $usage = "Unknown argument, choose one of new:noArg";
+
+  if($cmd eq "new") {
+    #SOURCE: https://blog.darkpan.com/article/6/Perl-and-Google-Authenticator.html
+    my $secret_bytes  = urandom(50);
+    my $secret_base32 = encode_base32( $secret_bytes );
+    Log3($hash,5,"googleAuth $name: secret_bytes=$secret_bytes");
+    Log3($hash,5,"googleAuth $name: set secret_base32=$secret_base32");
+
+    setKeyValue("googleAuth$name",$secret_base32); # write to fhem keystore
+
+    my $label  = "FHEM%20Authentication%20$name";
+    my $qrsize = AttrVal("$name",'ga_qrsize','200x200');
+    my $url    = "otpauth://totp/$label?secret=$secret_base32";
+    my $qr_url = "https://chart.googleapis.com/chart?cht=qr&chs=$qrsize"."&chl=".uri_escape($url);
+
+    readingsSingleUpdate($hash,'qr_url',$qr_url,1);
+    my $ret = "<html><a href=\"$qr_url\"><img src=\"$qr_url\" ><\/a></html>";
+    return $ret;
+ ;
+
+  }
+  return $usage;
+}
+
+sub GoogleAuth_Get($$@) {
+  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
+
+<a name="GoogleAuthenticator"></a>
+<h3>GoogleAuthenticator</h3>
+<ul>
+  Module to use GoogleAuthenticator.<br><br>
+</ul>
+<br>
+=end html
+=cut