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# Authors:
# Jason Gerard DeRose <jderose@redhat.com>
# Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2008 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
"""
Backend plugin for XML-RPC client.
This provides a lightwieght XML-RPC client using Python standard library
``xmlrpclib`` module.
"""
import xmlrpclib
import socket
import httplib
import kerberos
from ipalib.backend import Backend
from ipalib.util import xmlrpc_marshal
from ipalib import api
from ipalib import errors
class xmlrpc(Backend):
"""
XML-RPC client backend plugin.
"""
def get_client(self):
"""
Return an xmlrpclib.ServerProxy instance (the client).
"""
# FIXME: Rob, is there any reason we can't use allow_none=True here?
# Are there any reasonably common XML-RPC client implementations
# that don't support the <nil/> extension?
# See: http://docs.python.org/library/xmlrpclib.html
uri = self.env.xmlrpc_uri
if uri.startswith('https://'):
return xmlrpclib.ServerProxy(uri,
transport=KerbTransport(),
)
return xmlrpclib.ServerProxy(uri)
def forward_call(self, name, *args, **kw):
"""
Forward a call over XML-RPC to an IPA server.
"""
self.info('Forwarding %r call to %r' % (name, self.env.xmlrpc_uri))
client = self.get_client()
command = getattr(client, name)
params = xmlrpc_marshal(*args, **kw)
try:
return command(*params)
except socket.error, e:
raise
except xmlrpclib.Fault, e:
err = errors.convertFault(e)
raise err
return
api.register(xmlrpc)
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,
kerberos.GSS_C_DELEG_FLAG |
kerberos.GSS_C_MUTUAL_FLAG |
kerberos.GSS_C_SEQUENCE_FLAG)
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
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