NAME

       Validate::Yubikey - Validate Yubikey OTPs

SYNOPSIS

           use Validate::Yubikey;

           sub validate_callback {
               my $public_id = shift;

               return {
                   iid => $iid,
                   key => $key,
                   count => $count,
                   use => $use,
                   lastuse => $lastuse,
                   lastts => $lastts,
               };
           }

           sub update_callback {
               my ($public_id, $data) = @_;
           }

           sub log_message {
               print shift, "\n";
           }

           my $yubi = Validate::Yubikey->new(
               callback => \&validate_callback,
               update_callback => \&update_callback,
               log_callback => \&log_message,
           );

           my $otp_valid = $yubi->validate("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");

DESCRIPTION

       The Yubikey is a hardware OTP token produced by Yubico (<http://www.yubico.com>).

       This module provides validation of Yubikey OTPs.  It relies on you to specify callback
       functions that handle retrieving token information from somewhere and updating the
       persistent information associated with each token.

METHODS

   new
       Create a new Validate::Yubikey instance.

       callback
           Required.

       update_callback
           Required.

       log_callback
           Optional.

   validate
       Arguments: $otp, @callback_args
       Return Value: $success

       Validate an OTP.

CALLBACKS

   callback
       Receives: $public_id, @callback_args
       Returns: \%token_data

       Called during validation when information about the token is required.  Receives the
       public ID of the Yubikey.  It's expected that your subroutine returns a hash reference
       containing the following keys:

       iid - Internal ID
       key - Secret key

       Plus the four values stored by the update_callback.

   update_callback
       Receives: $public_id, \%token_data, @callback_args
       Returns: nothing

       Called to update the persistent storage of token parameters that enable replay protection.
       %token_data will contain one or more of the following keys, which should be associated
       with the supplied $public_id:

       count
       use
       lastuse
       lastts

       These should all be integers.

   log_callback
       Receives: $log_message
       Returns: nothing

       Called with messages produced during validation.  If not supplied to new, logging will
       disabled.

EXAMPLE

       Here's a simple program that uses DBIx::Class to store token information.

           package YKKSM::DB::Token;
           use base qw/DBIx::Class/;

           __PACKAGE__->load_components(qw/PK::Auto Core/);
           __PACKAGE__->table('token');
           __PACKAGE__->add_columns(qw/uid pid iid key count use lastuse lastts/);
           __PACKAGE__->set_primary_key('uid');

           package YKKSM::DB;
           use base qw/DBIx::Class::Schema/;

           __PACKAGE__->load_classes(qw/Token/);

           package YKTest;
           use Validate::Yubikey;

           my $schema = YKKSM::DB->connect("dbi:SQLite:dbname=yktest.db");

           my $yk = Validate::Yubikey->new(
               callback => sub {
                   my $pid = shift;
                   my $token = $schema->resultset('Token')->find({ pid => $pid });

                   if ($token) {
                       return {
                           iid => $token->iid,
                           key => $token->key,
                           count => $token->count,
                           use => $token->use,
                           lastuse => $token->lastuse,
                           lastts => $token->lastts,
                       };
                   } else {
                       return undef;
                   }
               },
               update_callback => sub {
                   my ($pid, $data) = @_;
                   my $token = $schema->resultset('Token')->find({ pid => $pid });
                   if ($token) {
                       $token->update($data);
                   } else {
                       die "asked to update nonexistent token $pid";
                   }
               },
               log_callback => sub {
                   print shift, "\n";
               },
           );

           if ($yk->validate($ARGV[0])) {
               print "success!\n";
           } else {
               print "failure 8(\n";
           }

AUTHOR

       Ben Wilber <ben@desync.com>

       But most of this module was derived from Yubico's PHP stuff.

LICENSE

       This library is free software and may be distributed under the same terms as perl itself.