GSSAPI(3)

NAME
GSSAPI - Perl extension providing access to the GSSAPIv2 library

SYNOPSIS
  use GSSAPI;

  my $targethostname = 'HTTP@moerbsen.grolmsnet.lan';
  my $status;

   TRY: {
       my ($target, $tname, $ttl );
       $status = GSSAPI::Name->import( $target,
                                       $server,
                                       GSSAPI::OID::gss_nt_hostbased_service)
               or last;
       $status = $target->display($tname) or last;
       print "\n using Name $tname";

       my $ctx = GSSAPI::Context->new();
       my $imech = GSSAPI::OID::gss_mech_krb5;
       my $iflags = 0 ;
       my $bindings = GSS_C_NO_CHANNEL_BINDINGS;
       my $creds = GSS_C_NO_CREDENTIAL;
       my $itime = 0;
       my $itoken = q{};
       my $otoken;

       $status = $ctx->init($creds,$target,
                            $imech,$iflags,$itime,$bindings,$itoken,
                            undef, $otoken,undef,undef) or last;
       $status = $ctx->valid_time_left($ttl) or last;
       print "\n Security context's time to live $ttl secs";
   }

   unless ($status->major == GSS_S_COMPLETE  ) {
      print "\nErrors: ", $status;
   } else {
      print "\n seems everything is fine, type klist to see the ticket\n";

DESCRIPTION
This module gives access to the routines of the GSSAPI library, as described in rfc2743 and rfc2744 and implemented by the Kerberos-1.2 distribution from MIT.

Since 0.14 it also compiles and works with Heimdal. Lacks of Heimdal support are gss_release_oid(), gss_str_to_oid() and fail of some tests. Have a look at the tests in t/ directory too see what tests fail on Heimdal ( the *.t tests are just skipping them at the moment)

The API presented by this module is a mildly object oriented reinterpretation of the C API, where opaque C structures are Perl objects, but the style of function call has been left mostly untouched. As a result, most routines modify one or more of the parameters passed to them, reflecting the C call-by-reference (or call-by-value-return) semantics.

All users of this module are therefore strongly advised to localize all usage of these routines to minimize pain if and when the API changes.

USAGE
This module wraps the GSSAPI C-Bindings. If you are new to GSSAPI it is a good idea to read RFC2743 and RFC2744, the documentation requires you to be familiar with the concept and the wordings of GSSAPI programming.

the examples directory holds some working examples of usage:

getcred_hostbased.pl
    gets a GSSAPI Token for a service specified on commandline. (like kgetcred on Heimdal or kvno on MIT)

gss-client.pl
    a simple GSSAPI TCP client.

gss-server.pl
    a simple GSSAPI TCP server. Use both as templates if you need quickhacking GSSAPI enabeled GSSAPI TCP services.

  GSSAPI::Name
GSSAPI internal representation of principalname

Methods

import( $gssapinameobj, $servicename, $mechnism_oid );
    converts stringrepresentation $servicename of service into a GSSAPI internal format and stores it in $gssapiservicename.

    input
        servicename
            Scalar value, like 'HTTP@moerbsen.grolmsnet.lan'.

        mechnism_oid
            Chose one of the predefines mechanism OIDs from GSSAPI::OID

    output
        $gssapinameobj
            GSSAPI internal representation of servicename

    return value
        returns GSSAPI::Status Object

    Example:
             $status = GSSAPI::Name->import( $gssapinameobj,
                                             'HTTP@moerbsen.grolmsnet.lan',
                                             GSSAPI::OID::gss_nt_hostbased_service);

display($tname);
    converts the GSSAPI internal format into a humanreadable string and stores it into $tname.

    output
        humanreadable string will be stored into $tname.

    return value
        returns GSSAPI::Status Object

    Example:
             my $tname;
             $status = $gssapinameobj->display($tname);
             die 'hmm, error...' if($status->major != GSS_S_COMPLETE );
             print "\n  Name is $tname";

compare( nameobj, ret)
    Wraps gss_compare_name().

    Input
        nameobj
            the 2nd GSSAPI::Name to be compared to

    output
        ret
            value is non-zero
                names refer to same entity

            value is zero
                names refer to different entities.

    return value
        returns GSSAPI::Status Object

  EXPORT
  GSS_C_ACCEPT
  GSS_C_AF_APPLETALK
  GSS_C_AF_BSC
  GSS_C_AF_CCITT
  GSS_C_AF_CHAOS
  GSS_C_AF_DATAKIT
  GSS_C_AF_DECnet
  GSS_C_AF_DLI
  GSS_C_AF_DSS
  GSS_C_AF_ECMA
  GSS_C_AF_HYLINK
  GSS_C_AF_IMPLINK
  GSS_C_AF_INET
  GSS_C_AF_LAT
  GSS_C_AF_LOCAL
  GSS_C_AF_NBS
  GSS_C_AF_NS
  GSS_C_AF_NULLADDR
  GSS_C_AF_OSI
  GSS_C_AF_PUP
  GSS_C_AF_SNA
  GSS_C_AF_UNSPEC
  GSS_C_AF_X25
  GSS_C_ANON_FLAG
  GSS_C_BOTH
  GSS_C_CALLING_ERROR_MASK
  GSS_C_CALLING_ERROR_OFFSET
  GSS_C_CONF_FLAG
  GSS_C_DELEG_FLAG
  GSS_C_EMPTY_BUFFER
  GSS_C_GSS_CODE
  GSS_C_INDEFINITE
  GSS_C_INITIATE
  GSS_C_INTEG_FLAG
  GSS_C_MECH_CODE
  GSS_C_MUTUAL_FLAG
  GSS_C_NO_BUFFER
  GSS_C_NO_CHANNEL_BINDINGS
  GSS_C_NO_CONTEXT
  GSS_C_NO_CREDENTIAL
  GSS_C_NO_NAME
  GSS_C_NO_OID
  GSS_C_NO_OID_SET
  GSS_C_PROT_READY_FLAG
  GSS_C_QOP_DEFAULT
  GSS_C_REPLAY_FLAG
  GSS_C_ROUTINE_ERROR_MASK
  GSS_C_ROUTINE_ERROR_OFFSET
  GSS_C_SEQUENCE_FLAG
  GSS_C_SUPPLEMENTARY_MASK
  GSS_C_SUPPLEMENTARY_OFFSET
  GSS_C_TRANS_FLAG
  GSS_S_BAD_BINDINGS
  GSS_S_BAD_MECH
  GSS_S_BAD_NAME
  GSS_S_BAD_NAMETYPE
  GSS_S_BAD_QOP
  GSS_S_BAD_SIG
  GSS_S_BAD_STATUS
  GSS_S_CALL_BAD_STRUCTURE
  GSS_S_CALL_INACCESSIBLE_READ
  GSS_S_CALL_INACCESSIBLE_WRITE
  GSS_S_COMPLETE
  GSS_S_CONTEXT_EXPIRED
  GSS_S_CONTINUE_NEEDED
  GSS_S_CREDENTIALS_EXPIRED
  GSS_S_CRED_UNAVAIL
  GSS_S_DEFECTIVE_CREDENTIAL
  GSS_S_DEFECTIVE_TOKEN
  GSS_S_DUPLICATE_ELEMENT
  GSS_S_DUPLICATE_TOKEN
  GSS_S_FAILURE
  GSS_S_GAP_TOKEN
  GSS_S_NAME_NOT_MN
  GSS_S_NO_CONTEXT
  GSS_S_NO_CRED
  GSS_S_OLD_TOKEN
  GSS_S_UNAUTHORIZED
  GSS_S_UNAVAILABLE
  GSS_S_UNSEQ_TOKEN

  Exportable functions
    $status = indicate_mechs($oidset)

Example

   use GSSAPI qw(:all);

   my $oidset;
   my $isin = 0;

   my $status = indicate_mechs( $oidset );
   $status->major == GSS_S_COMPLETE || die 'error';

   $status = $oidset->contains( gss_mech_krb5_old, $isin );
   $status->major == GSS_S_COMPLETE || die 'error';

   if ( $isin ) {
     print 'Support of Kerberos 5 old mechtype';
   } else {
     print 'No Support of Kerberos 5 old mechtype';
   }

Constant OIDs provided:

    # Constant OIDs provided:
    $oid = gss_nt_user_name;
    $oid = gss_nt_machine_uid_name;
    $oid = gss_nt_string_uid_name;
    $oid = gss_nt_service_name;
    $oid = gss_nt_exported_name;
    $oid = gss_nt_service_name_v2;
    $oid = gss_nt_krb5_name;
    $oid = gss_nt_krb5_principal;
    $oid = gss_mech_krb5;
    $oid = gss_mech_krb5_old;
    $oid = gss_mech_spnego;

All other functions are class or instance methods.

SEE ALSO
GSSAPI::Status(3p) GSSAPI::OID(3p) GSSAPI::OID::Set(3p)

RFC2743
    Generic Security Service API Version 2 : C-bindings

RFC2744
    Generic Security Service Application Program Interface

LWP::Authen::Negotiate
    GSSAPI based Authentication plugin for LWP

Authen::SASL::Perl::GSSAPI
    A SASL adapter, implementing the Authen::SASL interface, using GSSAPI.pm

http://perlgssapi.sourceforge.net/
    Holds an actual list of GSSAPI.pm authentication using modules

perl(1)

BUGS
More documentation how to use the module has to be added.

SUPPORT
See our project home at <http://perlgssapi.sourceforge.net/>

Mailinglist perlgssapi-users@lists.sourceforge.net

AUTHOR
The module ist maintained by Achim Grolms <perl@grolmsnet.de>

originally written by Philip Guenther <pguen@cpan.org>

THANKS TO

Philip Guenther
Leif Johansson
Merijn Broeren
Harald Joerg
Christopher Odenbach
Dax Kelson
Marc Lehmann
David Leonard
Florian Ragwitz
    maintainer of Debian package

Markus Moeller
    Solaris 10 / OpenSolaris support

COPYRIGHT
Copyright (c) 2006,2008 Achim Grolms. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

Copyright (c) 2000,2001,2005 Philip Guenther. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.