# Authors: Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2007  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 only
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

import httplib
import xmlrpclib
import kerberos

class KerbTransport(xmlrpclib.SafeTransport):
    """Handles Kerberos Negotiation authentication to an XML-RPC server."""

    def get_host_info(self, host):

        host, extra_headers, x509 = xmlrpclib.Transport.get_host_info(self, host)

        # Set the remote host principal
        h = host
        hostinfo = h.split(':')
        service = "HTTP@" + hostinfo[0]

        try:
            rc, vc = kerberos.authGSSClientInit(service);
        except kerberos.GSSError, e:
            raise kerberos.GSSError(e)

        try:
            kerberos.authGSSClientStep(vc, "");
        except kerberos.GSSError, e:
            raise kerberos.GSSError(e)

        extra_headers = [
            ("Authorization", "negotiate %s" % kerberos.authGSSClientResponse(vc) )
            ]

        return host, extra_headers, x509