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#!/usr/bin/python2
# Authors:
# Christian Heimes <cheimes@redhat.com>
#
# Copyright (C) 2015 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, 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/>.
#
"""ipa-httpd-kdproxy
This script creates or removes the symlink from /etc/ipa/ipa-kdc-proxy.conf
to /etc/httpd/conf.d/. It's called from ExecStartPre hook in httpd.service.
"""
import os
import sys
from ipalib import api, errors
from ipapython.ipa_log_manager import standard_logging_setup
from ipapython.ipaldap import IPAdmin
from ipapython.dn import DN
from ipaplatform.paths import paths
DEBUG = False
TIME_LIMIT = 2
class CheckError(Exception):
"""An unrecoverable error has occured"""
class KDCProxyConfig(object):
ipaconfig_flag = 'ipaKDCProxyEnabled'
def __init__(self, time_limit=TIME_LIMIT):
self.time_limit = time_limit
self.con = None
self.log = api.log
self.ldap_uri = api.env.ldap_uri
self.kdc_dn = DN(('cn', 'KDC'), ('cn', api.env.host),
('cn', 'masters'), ('cn', 'ipa'), ('cn', 'etc'),
api.env.basedn)
self.conf = paths.HTTPD_IPA_KDCPROXY_CONF
self.conflink = paths.HTTPD_IPA_KDCPROXY_CONF_SYMLINK
def _ldap_con(self):
"""Establish LDAP connection"""
self.log.debug('ldap_uri: %s', self.ldap_uri)
try:
self.con = IPAdmin(ldap_uri=self.ldap_uri)
# EXTERNAL bind as root user
self.con.ldapi = True
self.con.do_bind(timeout=self.time_limit)
except errors.NetworkError as e:
msg = 'Failed to get setting from dirsrv: %s' % e
self.log.exception(msg)
raise CheckError(msg)
except Exception as e:
msg = ('Unknown error while retrieving setting from %s: %s' %
(self.ldap_uri, e))
self.log.exception(msg)
raise CheckError(msg)
def _find_entry(self, dn, attrs, filter, scope=IPAdmin.SCOPE_BASE):
"""Find an LDAP entry, handles NotFound and Limit"""
try:
entries, truncated = self.con.find_entries(
filter, attrs, dn, scope, time_limit=self.time_limit)
if truncated:
raise errors.LimitsExceeded()
except errors.NotFound:
self.log.debug('Entry not found: %s', dn)
return None
except Exception as e:
msg = ('Unknown error while retrieving setting from %s: %s' %
(self.ldap_uri, e))
self.log.exception(msg)
raise CheckError(msg)
return entries[0]
def is_host_enabled(self):
"""Check replica specific flag"""
self.log.debug('Read settings from dn: %s', self.kdc_dn)
srcfilter = self.con.make_filter(
{'ipaConfigString': u'kdcProxyEnabled'}
)
entry = self._find_entry(self.kdc_dn, ['cn'], srcfilter)
self.log.debug('%s ipaConfigString: %s', self.kdc_dn, entry)
return entry is not None
def validate_symlink(self):
"""Validate symlink in Apache conf.d"""
if not os.path.exists(self.conflink):
return False
if not os.path.islink(self.conflink):
raise CheckError("'%s' already exists, but it is not a symlink" %
self.conflink)
dest = os.readlink(self.conflink)
if dest != self.conf:
raise CheckError("'%s' points to '%s', expected '%s'"
% (self.conflink, dest, self.conf))
return True
def create_symlink(self):
"""Create symlink to enable KDC proxy support"""
try:
valid = self.validate_symlink()
except CheckError as e:
self.log.warn("Cannot enable KDC proxy: %s " % e)
return False
if valid:
self.log.debug("Symlink exists and is valid")
return True
if not os.path.isfile(self.conf):
self.log.warn("'%s' does not exist", self.conf)
return False
# create the symbolic link
self.log.debug("Creating symlink from '%s' to '%s'",
self.conf, self.conflink)
os.symlink(self.conf, self.conflink)
return True
def remove_symlink(self):
"""Delete symlink to disable KDC proxy support"""
try:
valid = self.validate_symlink()
except CheckError as e:
self.log.warn("Cannot disable KDC proxy: %s " % e)
return False
if valid:
self.log.debug("Removing symlink '%s'", self.conflink)
os.unlink(self.conflink)
else:
self.log.debug("Symlink '%s' has already been removed.",
self.conflink)
return True
def __enter__(self):
self._ldap_con()
return self
def __exit__(self, exc_type, exc_value, traceback):
if self.con is not None:
self.con.unbind()
self.con = None
def main(debug=DEBUG, time_limit=TIME_LIMIT):
# initialize API without file logging
if not api.isdone('bootstrap'):
api.bootstrap(context='kdcproxyshim', log=None, debug=debug)
standard_logging_setup(verbose=True, debug=debug)
with KDCProxyConfig(time_limit) as cfg:
if cfg.is_host_enabled():
if cfg.create_symlink():
api.log.info('KDC proxy enabled')
else:
if cfg.remove_symlink():
api.log.info('KDC proxy disabled')
if __name__ == '__main__':
main()
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