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#! /usr/bin/python -E
# Authors: Simo Sorce <ssorce@redhat.com>
#
# Copyright (C) 2007 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 or later
#
# 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
#
import subprocess
import string
import tempfile
import shutil
import logging
from random import Random
from time import gmtime
import os
import pwd
import socket
import time
from util import *
def host_to_domain(fqdn):
s = fqdn.split(".")
return ".".join(s[1:])
def generate_kdc_password():
rndpwd = ''
r = Random()
r.seed(gmtime())
for x in range(12):
# rndpwd += chr(r.randint(32,126))
rndpwd += chr(r.randint(65,90)) #stricter set for testing
return rndpwd
def ldap_mod(fd, dn, pwd):
args = ["/usr/bin/ldapmodify", "-h", "127.0.0.1", "-xv", "-D", dn, "-w", pwd, "-f", fd.name]
run(args)
class KrbInstance:
def __init__(self):
self.ds_user = None
self.fqdn = None
self.realm = None
self.domain = None
self.host = None
self.admin_password = None
self.master_password = None
self.suffix = None
self.kdc_password = None
self.sub_dict = None
def create_instance(self, ds_user, realm_name, host_name, admin_password, master_password):
self.ds_user = ds_user
self.fqdn = host_name
self.ip = socket.gethostbyname(host_name)
self.realm = realm_name.upper()
self.host = host_name.split(".")[0]
self.domain = host_to_domain(host_name)
self.admin_password = admin_password
self.master_password = master_password
self.suffix = realm_to_suffix(self.realm)
self.kdc_password = generate_kdc_password()
self.__configure_kdc_account_password()
self.__setup_sub_dict()
self.__configure_ldap()
self.__configure_http()
self.__create_instance()
self.__create_ds_keytab()
self.__create_http_keytab()
self.__export_kadmin_changepw_keytab()
self.__create_sample_bind_zone()
self.__add_pwd_extop_module()
self.start()
def stop(self):
run(["/sbin/service", "krb5kdc", "stop"])
def start(self):
run(["/sbin/service", "krb5kdc", "start"])
def restart(self):
run(["/sbin/service", "krb5kdc", "restart"])
def __configure_kdc_account_password(self):
hexpwd = ''
for x in self.kdc_password:
hexpwd += (hex(ord(x))[2:])
pwd_fd = open("/var/kerberos/krb5kdc/ldappwd", "a+")
pwd_fd.write("uid=kdc,cn=kerberos,"+self.suffix+"#{HEX}"+hexpwd+"\n")
pwd_fd.close()
def __setup_sub_dict(self):
self.sub_dict = dict(FQDN=self.fqdn,
IP=self.ip,
PASSWORD=self.kdc_password,
SUFFIX=self.suffix,
DOMAIN=self.domain,
HOST=self.host,
REALM=self.realm)
def __configure_ldap(self):
#TODO: test that the ldif is ok with any random charcter we may use in the password
kerberos_txt = template_file(SHARE_DIR + "kerberos.ldif", self.sub_dict)
kerberos_fd = write_tmp_file(kerberos_txt)
ldap_mod(kerberos_fd, "cn=Directory Manager", self.admin_password)
kerberos_fd.close()
#Change the default ACL to avoid anonimous access to kerberos keys and othe hashes
aci_txt = template_file(SHARE_DIR + "default-aci.ldif", self.sub_dict)
aci_fd = write_tmp_file(aci_txt)
ldap_mod(aci_fd, "cn=Directory Manager", self.admin_password)
aci_fd.close()
def __create_instance(self):
kdc_conf = template_file(SHARE_DIR+"kdc.conf.template", self.sub_dict)
kdc_fd = open("/var/kerberos/krb5kdc/kdc.conf", "w+")
kdc_fd.write(kdc_conf)
kdc_fd.close()
krb5_conf = template_file(SHARE_DIR+"krb5.conf.template", self.sub_dict)
krb5_fd = open("/etc/krb5.conf", "w+")
krb5_fd.write(krb5_conf)
krb5_fd.close()
#populate the directory with the realm structure
args = ["/usr/kerberos/sbin/kdb5_ldap_util", "-D", "uid=kdc,cn=kerberos,"+self.suffix, "-w", self.kdc_password, "create", "-s", "-P", self.master_password, "-r", self.realm, "-subtrees", self.suffix, "-sscope", "sub"]
run(args)
#add the password extop module
def __add_pwd_extop_module(self):
extop_txt = template_file(SHARE_DIR + "pwd-extop-conf.ldif", self.sub_dict)
extop_fd = write_tmp_file(extop_txt)
ldap_mod(extop_fd, "cn=Directory Manager", self.admin_password)
extop_fd.close()
#add an ACL to let the DS user read the master key
args = ["/usr/bin/setfacl", "-m", "u:"+self.ds_user+":r", "/var/kerberos/krb5kdc/.k5."+self.realm]
run(args)
def __create_sample_bind_zone(self):
bind_txt = template_file(SHARE_DIR + "bind.zone.db.template", self.sub_dict)
[bind_fd, bind_name] = tempfile.mkstemp(".db","sample.zone.")
os.write(bind_fd, bind_txt)
os.close(bind_fd)
print "Sample zone file for bind has been created in "+bind_name
def __create_ds_keytab(self):
(kwrite, kread, kerr) = os.popen3("/usr/kerberos/sbin/kadmin.local")
kwrite.write("addprinc -randkey ldap/"+self.fqdn+"@"+self.realm+"\n")
kwrite.flush()
kwrite.write("ktadd -k /etc/dirsrv/ds.keytab ldap/"+self.fqdn+"@"+self.realm+"\n")
kwrite.flush()
kwrite.close()
kread.close()
kerr.close()
cfg_fd = open("/etc/sysconfig/dirsrv", "a")
cfg_fd.write("export KRB5_KTNAME=/etc/dirsrv/ds.keytab\n")
cfg_fd.close()
pent = pwd.getpwnam(self.ds_user)
os.chown("/etc/dirsrv/ds.keytab", pent.pw_uid, pent.pw_gid)
def __export_kadmin_changepw_keytab(self):
(kwrite, kread, kerr) = os.popen3("/usr/kerberos/sbin/kadmin.local")
kwrite.write("modprinc +requires_preauth kadmin/changepw\n")
kwrite.flush()
kwrite.close()
kread.close()
kerr.close()
(kwrite, kread, kerr) = os.popen3("/usr/kerberos/sbin/kadmin.local")
kwrite.write("ktadd -k /var/kerberos/krb5kdc/kpasswd.keytab kadmin/changepw\n")
kwrite.flush()
kwrite.close()
kread.close()
kerr.close()
cfg_fd = open("/etc/sysconfig/ipa-kpasswd", "a")
cfg_fd.write("export KRB5_KTNAME=/var/kerberos/krb5kdc/kpasswd.keytab\n")
cfg_fd.close()
pent = pwd.getpwnam(self.ds_user)
os.chown("/var/kerberos/krb5kdc/kpasswd.keytab", pent.pw_uid, pent.pw_gid)
def __create_http_keytab(self):
(kwrite, kread, kerr) = os.popen3("/usr/kerberos/sbin/kadmin.local")
kwrite.write("addprinc -randkey HTTP/"+self.fqdn+"@"+self.realm+"\n")
kwrite.flush()
kwrite.write("ktadd -k /etc/httpd/conf/ipa.keytab HTTP/"+self.fqdn+"@"+self.realm+"\n")
kwrite.flush()
kwrite.close()
kread.close()
kerr.close()
while not file_exists("/etc/httpd/conf/ipa.keytab"):
time.sleep(1)
pent = pwd.getpwnam("apache")
os.chown("/etc/httpd/conf/ipa.keytab", pent.pw_uid, pent.pw_gid)
def __configure_http(self):
http_txt = template_file(SHARE_DIR + "ipa.conf", self.sub_dict)
http_fd = open("/etc/httpd/conf.d/ipa.conf", "w")
http_fd.write(http_txt)
http_fd.close()
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