NAME

       Authen::SASL::Perl::GSSAPI - GSSAPI (Kerberosv5) Authentication class

SYNOPSIS

         use Authen::SASL qw(Perl);

         $sasl = Authen::SASL->new( mechanism => 'GSSAPI' );

         $sasl = Authen::SASL->new( mechanism => 'GSSAPI',
                                    callback => { pass => $mycred });

         $sasl->client_start( $service, $host );

DESCRIPTION

       This method implements the client part of the GSSAPI SASL algorithm, as described in RFC
       2222 section 7.2.1 resp. draft-ietf-sasl-gssapi-XX.txt.

       With a valid Kerberos 5 credentials cache (aka TGT) it allows to connect to service@host
       given as the first two parameters to Authen::SASL's client_start() method.  Alternatively,
       a GSSAPI::Cred object can be passed in via the Authen::SASL callback hash using the `pass'
       key.

       Please note that this module does not currently implement a SASL security layer following
       authentication. Unless the connection is protected by other means, such as TLS, it will be
       vulnerable to man-in-the-middle attacks. If security layers are required, then the
       Authen::SASL::XS GSSAPI module should be used instead.

   CALLBACK
       The callbacks used are:

       authname
           The authorization identity to be used in SASL exchange

       gssmech
           The GSS mechanism to be used in the connection

       pass
           The GSS credentials to be used in the connection (optional)

EXAMPLE

        #! /usr/bin/perl -w

        use strict;

        use Net::LDAP 0.33;
        use Authen::SASL 2.10;

        # -------- Adjust to your environment --------
        my $adhost      = 'theserver.bla.net';
        my $ldap_base   = 'dc=bla,dc=net';
        my $ldap_filter = '(&(sAMAccountName=BLAAGROL))';

        my $sasl = Authen::SASL->new(mechanism => 'GSSAPI');
        my $ldap;

        eval {
            $ldap = Net::LDAP->new($adhost,
                                   onerror => 'die')
              or  die "Cannot connect to LDAP host '$adhost': '$@'";
            $ldap->bind(sasl => $sasl);
        };

        if ($@) {
            chomp $@;
            die   "\nBind error         : $@",
                  "\nDetailed SASL error: ", $sasl->error,
                  "\nTerminated";
        }

        print "\nLDAP bind() succeeded, working in authenticated state";

        my $mesg = $ldap->search(base   => $ldap_base,
                                 filter => $ldap_filter);

        # -------- evaluate $mesg

   PROPERTIES
       The properties used are:

       maxbuf
           The maximum buffer size for receiving cipher text

       minssf
           The minimum SSF value that should be provided by the SASL security layer.  The default
           is 0

       maxssf
           The maximum SSF value that should be provided by the SASL security layer.  The default
           is 2**31

       externalssf
           The SSF value provided by an underlying external security layer.  The default is 0

       ssf The actual SSF value provided by the SASL security layer after the SASL authentication
           phase has been completed. This value is read-only and set by the implementation after
           the SASL authentication phase has been completed.

       maxout
           The maximum plaintext buffer size for sending data to the peer.  This value is set by
           the implementation after the SASL authentication phase has been completed and a SASL
           security layer is in effect.

SEE ALSO

       Authen::SASL, Authen::SASL::Perl

AUTHORS

       Written by Simon Wilkinson, with patches and extensions by Achim Grolms and Peter
       Marschall.

       Please report any bugs, or post any suggestions, to the perl-ldap mailing list
       <perl-ldap@perl.org>

COPYRIGHT

       Copyright (c) 2006 Simon Wilkinson, Achim Grolms and Peter Marschall.  All rights
       reserved. This program is free software; you can redistribute it and/or modify it under
       the same terms as Perl itself.