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# Copyright (C) 2014 Simo Sorce <simo@redhat.com>
#
# 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, either version 3 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
from ipsilon.login.common import LoginPageBase, LoginManagerBase, \
LoginManagerInstaller
from ipsilon.util.plugin import PluginObject
from ipsilon.util.user import UserSession
from string import Template
import cherrypy
import os
class Krb(LoginPageBase):
def root(self, *args, **kwargs):
# Someone typed manually or a robot is walking th tree.
# Redirect to default page
return self.lm.redirect_to_path(self.lm.path)
class KrbAuth(LoginPageBase):
def root(self, *args, **kwargs):
trans = self.get_valid_transaction('login', **kwargs)
# If we can get here, we must be authenticated and remote_user
# was set. Check the session has a user set already or error.
us = UserSession()
us.remote_login()
self.user = us.get_user()
if not self.user.is_anonymous:
userdata = {'krb_principal_name': self.user.name}
return self.lm.auth_successful(trans, self.user.name,
'krb', userdata)
else:
return self.lm.auth_failed(trans)
class KrbError(LoginPageBase):
def root(self, *args, **kwargs):
cherrypy.log.error('REQUEST: %s' % cherrypy.request.headers)
# If we have no negotiate header return whatever mod_auth_gssapi
# generated and wait for the next request
if 'WWW-Authenticate' not in cherrypy.request.headers:
cherrypy.response.status = 401
next_login = self.lm.next_login()
if next_login:
return next_login.page.root(*args, **kwargs)
conturl = '%s/login' % self.basepath
return self._template('login/krb.html',
title='Kerberos Login',
cont=conturl)
# If we get here, negotiate failed
trans = self.get_valid_transaction('login', **kwargs)
return self.lm.auth_failed(trans)
class LoginManager(LoginManagerBase):
def __init__(self, *args, **kwargs):
super(LoginManager, self).__init__(*args, **kwargs)
self.name = 'krb'
self.path = 'krb/negotiate'
self.page = None
self.description = """
Kerberos Negotiate authentication plugin. Relies on the mod_auth_gssapi
apache plugin for actual authentication. """
self.new_config(self.name)
def get_tree(self, site):
self.page = Krb(site, self)
self.page.__dict__['negotiate'] = KrbAuth(site, self)
self.page.__dict__['unauthorized'] = KrbError(site, self)
self.page.__dict__['failed'] = KrbError(site, self)
return self.page
CONF_TEMPLATE = """
<Location /${instance}/login/krb/negotiate>
AuthType GSSAPI
AuthName "GSSAPI Single Sign On Login"
$keytab
GssapiSSLonly $gssapisslonly
GssapiLocalName on
Require valid-user
ErrorDocument 401 /${instance}/login/krb/unauthorized
ErrorDocument 500 /${instance}/login/krb/failed
</Location>
"""
class Installer(LoginManagerInstaller):
def __init__(self, *pargs):
super(Installer, self).__init__()
self.name = 'krb'
self.pargs = pargs
def install_args(self, group):
group.add_argument('--krb', choices=['yes', 'no'], default='no',
help='Configure Kerberos authentication')
group.add_argument('--krb-httpd-keytab',
default='/etc/httpd/conf/http.keytab',
help='Kerberos keytab location for HTTPD')
def configure(self, opts):
if opts['krb'] != 'yes':
return
confopts = {'instance': opts['instance']}
if os.path.exists(opts['krb_httpd_keytab']):
confopts['keytab'] = 'GssapiCredStore keytab:%s' % (
opts['krb_httpd_keytab'])
else:
raise Exception('Keytab not found')
if opts['secure'] == 'no':
confopts['gssapisslonly'] = 'Off'
else:
confopts['gssapisslonly'] = 'On'
tmpl = Template(CONF_TEMPLATE)
hunk = tmpl.substitute(**confopts) # pylint: disable=star-args
with open(opts['httpd_conf'], 'a') as httpd_conf:
httpd_conf.write(hunk)
# Add configuration data to database
po = PluginObject(*self.pargs)
po.name = 'krb'
po.wipe_data()
# Update global config, put 'krb' always first
ph = self.pargs[0]
ph.refresh_enabled()
if 'krb' not in ph.enabled:
enabled = []
enabled.extend(ph.enabled)
enabled.insert(0, 'krb')
ph.save_enabled(enabled)
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