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#!/usr/bin/python
#
# 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/>.
import logging
import pwd
import os
import socket
import subprocess
import sys
IPA_CONFIG_FILE = '/etc/ipa/default.conf'
HTTPD_IPA_KEYTAB = '/etc/httpd/conf/ipa.keytab'
IPA_COMMAND = '/usr/bin/ipa'
IPA_GETKEYTAB = '/usr/sbin/ipa-getkeytab'
HTTPD_USER = 'apache'
NO_CREDS_FOR_KEYTAB = """
Valid IPA admin credentials are required to get a keytab.
Please kinit with a pivileged user like 'admin' and retry.
"""
FAILED_TO_GET_KEYTAB = """
A pre-existing keytab was not found and it was not possible to
successfully retrieve a new keytab for the IPA server. Please
manually provide a keytab or resolve the error that cause this
failure (see logs) and retry.
"""
class Installer(object):
def __init__(self):
self.name = 'ipa'
self.ptype = 'helper'
self.logger = None
self.realm = None
self.domain = None
self.server = None
def install_args(self, group):
group.add_argument('--ipa', choices=['yes', 'no', 'auto'],
default='auto',
help='Helper for IPA joined machines')
def conf_init(self, opts):
logger = self.logger
# Do a simple check to see if machine is ipa joined
if not os.path.exists(IPA_CONFIG_FILE):
logger.info('No IPA configuration file. Skipping ipa helper...')
if opts['ipa'] == 'yes':
raise Exception('No IPA installation found!')
return
# Get config vars from ipa file
try:
from ipapython import config as ipaconfig
ipaconfig.init_config()
self.realm = ipaconfig.config.get_realm()
self.domain = ipaconfig.config.get_domain()
self.server = ipaconfig.config.get_server()
except Exception, e: # pylint: disable=broad-except
logger.info('IPA tools installation found: [%s]', str(e))
if opts['ipa'] == 'yes':
raise Exception('No IPA installation found!')
return
def get_keytab(self, opts):
logger = self.logger
# Check if we have need ipa tools
if not os.path.exists(IPA_GETKEYTAB):
logger.info('ipa-getkeytab missing. Will skip keytab creation.')
if opts['ipa'] == 'yes':
raise Exception('No IPA tools found!')
# Check if we already have a keytab for HTTP
if 'krb_httpd_keytab' in opts:
msg = "Searching for keytab in: %s" % opts['krb_httpd_keytab']
print >> sys.stdout, msg,
if os.path.exists(opts['krb_httpd_keytab']):
print >> sys.stdout, "... Found!"
return
else:
print >> sys.stdout, "... Not found!"
msg = "Searching for keytab in: %s" % HTTPD_IPA_KEYTAB
print >> sys.stdout, msg,
if os.path.exists(HTTPD_IPA_KEYTAB):
opts['krb_httpd_keytab'] = HTTPD_IPA_KEYTAB
print >> sys.stdout, "... Found!"
return
else:
print >> sys.stdout, "... Not found!"
us = socket.gethostname()
princ = 'HTTP/%s@%s' % (us, self.realm)
# Check we have credentials to access server (for keytab)
from ipapython import ipaldap
from ipalib import errors as ipaerrors
for srv in self.server:
msg = "Testing access to server: %s" % srv
print >> sys.stdout, msg,
try:
server = srv
c = ipaldap.IPAdmin(host=server)
c.do_sasl_gssapi_bind()
del c
print >> sys.stdout, "... Succeeded!"
break
except ipaerrors.ACIError, e:
# usually this error is returned when we have no
# good credentials, ask the user to kinit and retry
print >> sys.stderr, NO_CREDS_FOR_KEYTAB
logger.error('Invalid credentials: [%s]', repr(e))
raise Exception('Invalid credentials: [%s]', str(e))
except Exception, e: # pylint: disable=broad-except
# for other exceptions let's try to fail later
pass
try:
subprocess.check_output([IPA_COMMAND, 'service-add', princ],
stderr=subprocess.STDOUT)
except subprocess.CalledProcessError, e:
# hopefully this means the service already exists
# otherwise we'll fail later again
logger.info('Error trying to create HTTP service:')
logger.info('Cmd> %s\n%s', e.cmd, e.output)
try:
msg = "Trying to fetch keytab[%s] for %s" % (
opts['krb_httpd_keytab'], princ)
print >> sys.stdout, msg,
subprocess.check_output([IPA_GETKEYTAB,
'-s', server, '-p', princ,
'-k', opts['krb_httpd_keytab']],
stderr=subprocess.STDOUT)
except subprocess.CalledProcessError, e:
# unfortunately this one is fatal
print >> sys.stderr, FAILED_TO_GET_KEYTAB
logger.info('Error trying to get HTTP keytab:')
logger.info('Cmd> %s\n%s', e.cmd, e.output)
raise Exception('Missing keytab: [%s]' % str(e))
# Fixup permissions so only the ipsilon user can read these files
pw = pwd.getpwnam(HTTPD_USER)
os.chown(opts['krb_httpd_keytab'], pw.pw_uid, pw.pw_gid)
def configure_server(self, opts):
if opts['ipa'] != 'yes' and opts['ipa'] != 'auto':
return
if opts['ipa'] != 'yes' and opts['krb'] == 'no':
return
self.logger = logging.getLogger()
self.conf_init(opts)
self.get_keytab(opts)
# Forcibly use krb then pam modules
if 'lm_order' not in opts:
opts['lm_order'] = []
opts['krb'] = 'yes'
if 'krb' not in opts['lm_order']:
opts['lm_order'].insert(0, 'krb')
opts['form'] = 'yes'
if not any(lm in opts['lm_order'] for lm in ('form', 'pam')):
opts['lm_order'].append('form')
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