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#
# MIT Kerberos server class
#
# Copyright (c) 2016 Red Hat, Inc.
#
# 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 os
import signal
import shutil
import subprocess
from util import unindent
class KDC(object):
"""
MIT Kerberos KDC instance
"""
def __init__(self, basedir, realm,
includedir=None,
kdc_port=10088,
kadmin_port=10749,
master_key='master'):
self.basedir = basedir
self.realm = realm
self.kdc_port = kdc_port
self.kadmin_port = kadmin_port
self.master_key = master_key
self.kdc_basedir = self.basedir + "/var/krb5kdc"
self.includedir = includedir or (self.kdc_basedir + "/include")
self.kdc_logdir = self.kdc_basedir + "/log"
self.kdc_conf_path = self.kdc_basedir + "/kdc.conf"
self.krb5_conf_path = self.kdc_basedir + "/krb5.conf"
self.kdc_pid_file = self.kdc_basedir + "/kdc.pid"
self.acl_file = self.kdc_basedir + "/kadm5.acl"
self.admin_princ = "admin/admin@" + self.realm
def start_kdc(self, extra_args=[]):
args = ["krb5kdc", '-P', self.kdc_pid_file] + extra_args
return self._run_in_env(args, self.get_krb5_env())
def stop_kdc(self):
try:
with open(self.kdc_pid_file, "r") as pid_file:
os.kill(int(pid_file.read()), signal.SIGTERM)
except IOError as ioex:
if ioex.errno == 2:
pass
else:
raise ioex
def teardown(self):
self.stop_kdc()
shutil.rmtree(self.kdc_basedir)
def set_up(self):
self._create_config()
self._create_acl()
self._create_kdb()
def get_krb5_env(self):
my_env = os.environ.copy()
my_env['KRB5_CONFIG'] = self.krb5_conf_path
my_env['KRB5_KDC_PROFILE'] = self.kdc_conf_path
return my_env
def add_config(self, include_files):
for name, contents in include_files.items():
include_fpath = os.path.join(self.includedir, name)
with open(include_fpath, 'w') as include_file:
include_file.write(contents)
def add_principal(self, princ, password=None):
args = ["kadmin.local", "-q"]
if password is None:
args += ["addprinc -randkey %s" % (princ)]
else:
args += ["addprinc -pw %s %s" % (password, princ)]
return self._run_in_env(args, self.get_krb5_env())
def _run_in_env(self, args, env):
cmd = subprocess.Popen(args, env=env)
out, err = cmd.communicate()
return cmd.returncode, out, err
def _create_config(self):
try:
os.makedirs(self.kdc_basedir)
os.makedirs(self.kdc_logdir)
os.makedirs(self.includedir)
except OSError as osex:
if osex.errno == 17:
pass
kdc_conf = self._format_kdc_conf()
with open(self.kdc_conf_path, 'w') as kdc_conf_file:
kdc_conf_file.write(kdc_conf)
krb5_conf = self._format_krb5_conf()
with open(self.krb5_conf_path, 'w') as krb5_conf_file:
krb5_conf_file.write(krb5_conf)
def _create_acl(self):
with open(self.acl_file, 'w') as acl_fobject:
acl_fobject.write(self.admin_princ)
def _create_kdb(self):
self._run_in_env(
['kdb5_util', 'create', '-W', '-s', '-P', self.master_key],
self.get_krb5_env()
)
def _format_kdc_conf(self):
database_path = self.kdc_basedir + "/principal"
key_stash = self.kdc_basedir + "/stash." + self.realm
kdc_logfile = "FILE:" + self.kdc_logdir + "/krb5kdc.log"
kadmin_logfile = "FILE:" + self.kdc_logdir + "/kadmin.log"
libkrb5_logfile = "FILE:" + self.kdc_logdir + "/libkrb5.log"
kdc_conf = unindent("""
[kdcdefaults]
kdc_ports = {self.kdc_port}
kdc_tcp_ports = {self.kdc_port}
[realms]
{self.realm} = {{
kadmind_port = {self.kadmin_port}
database_name = {database_path}
key_stash_file = {key_stash}
max_life = 7d
max_renewable_life = 14d
acl_file = {self.acl_file}
}}
[logging]
kdc = {kdc_logfile}
admin_server = {kadmin_logfile}
default = {libkrb5_logfile}
""").format(**locals())
return kdc_conf
def _format_krb5_conf(self):
kdc_uri = "localhost:%d" % self.kdc_port
kadmin_uri = "localhost:%d" % self.kadmin_port
krb5_conf = unindent("""
includedir {self.includedir}
[libdefaults]
default_realm = {self.realm}
dns_lookup_kdc = false
dns_lookup_realm = false
[realms]
{self.realm} = {{
kdc = {kdc_uri}
admin_server = {kadmin_uri}
}}
""").format(**locals())
return krb5_conf
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