# Authors: Simo Sorce # # 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 only # # 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 import fileinput import re import sys import os import pwd import socket import shutil import service import installutils from ipapython import sysrestore from ipapython import ipautil from ipalib import util from ipalib import errors2 from ipaserver import ipaldap import ldap from ldap import LDAPError from ldap import ldapobject from pyasn1.type import univ, namedtype import pyasn1.codec.ber.encoder import pyasn1.codec.ber.decoder import struct import base64 KRBMKEY_DENY_ACI = """ (targetattr = "krbMKey")(version 3.0; acl "No external access"; deny (all) userdn != "ldap:///uid=kdc,cn=sysaccounts,cn=etc,$SUFFIX";) """ def update_key_val_in_file(filename, key, val): if os.path.exists(filename): pattern = "^[\s#]*%s\s*=\s*%s\s*" % (re.escape(key), re.escape(val)) p = re.compile(pattern) for line in fileinput.input(filename): if p.search(line): fileinput.close() return fileinput.close() pattern = "^[\s#]*%s\s*=" % re.escape(key) p = re.compile(pattern) for line in fileinput.input(filename, inplace=1): if not p.search(line): sys.stdout.write(line) fileinput.close() f = open(filename, "a") f.write("%s=%s\n" % (key, val)) f.close() class KpasswdInstance(service.SimpleServiceInstance): def __init__(self): service.SimpleServiceInstance.__init__(self, "ipa_kpasswd") class KrbInstance(service.Service): def __init__(self, fstore=None): service.Service.__init__(self, "krb5kdc") 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 self.kpasswd = KpasswdInstance() if fstore: self.fstore = fstore else: self.fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore') def __common_setup(self, ds_user, realm_name, host_name, domain_name, admin_password): self.ds_user = ds_user self.fqdn = host_name self.realm = realm_name.upper() self.host = host_name.split(".")[0] self.ip = socket.gethostbyname(host_name) self.domain = domain_name self.suffix = util.realm_to_suffix(self.realm) self.kdc_password = ipautil.ipa_generate_password() self.admin_password = admin_password self.__setup_sub_dict() # get a connection to the DS try: self.conn = ipaldap.IPAdmin(self.fqdn) self.conn.do_simple_bind(bindpw=self.admin_password) except Exception, e: logging.critical("Could not connect to the Directory Server on %s" % self.fqdn) raise e self.backup_state("running", self.is_running()) try: self.stop() except: # It could have been not running pass def __common_post_setup(self): self.step("starting the KDC", self.__start_instance) self.step("configuring KDC to start on boot", self.__enable) def create_instance(self, ds_user, realm_name, host_name, domain_name, admin_password, master_password): self.master_password = master_password self.__common_setup(ds_user, realm_name, host_name, domain_name, admin_password) self.step("setting KDC account password", self.__configure_kdc_account_password) self.step("adding sasl mappings to the directory", self.__configure_sasl_mappings) self.step("adding kerberos entries to the DS", self.__add_krb_entries) self.step("adding default ACIs", self.__add_default_acis) self.step("configuring KDC", self.__create_instance) self.step("adding default keytypes", self.__add_default_keytypes) self.step("creating a keytab for the directory", self.__create_ds_keytab) self.step("creating a keytab for the machine", self.__create_host_keytab) self.step("exporting the kadmin keytab", self.__export_kadmin_changepw_keytab) self.step("adding the password extension to the directory", self.__add_pwd_extop_module) self.step("adding the kerberos master key to the directory", self.__add_master_key) self.__common_post_setup() self.start_creation("Configuring Kerberos KDC") self.kpasswd.create_instance() def create_replica(self, ds_user, realm_name, host_name, domain_name, admin_password, ldap_passwd_filename, kpasswd_filename): self.__copy_ldap_passwd(ldap_passwd_filename) self.__copy_kpasswd_keytab(kpasswd_filename) self.__common_setup(ds_user, realm_name, host_name, domain_name, admin_password) self.step("adding sasl mappings to the directory", self.__configure_sasl_mappings) self.step("writing stash file from DS", self.__write_stash_from_ds) self.step("configuring KDC", self.__create_replica_instance) self.step("creating a keytab for the directory", self.__create_ds_keytab) self.step("creating a keytab for the machine", self.__create_host_keytab) self.step("adding the password extension to the directory", self.__add_pwd_extop_module) self.__common_post_setup() self.start_creation("Configuring Kerberos KDC") self.kpasswd.create_instance() def __copy_ldap_passwd(self, filename): self.fstore.backup_file("/var/kerberos/krb5kdc/ldappwd") shutil.copy(filename, "/var/kerberos/krb5kdc/ldappwd") os.chmod("/var/kerberos/krb5kdc/ldappwd", 0600) def __copy_kpasswd_keytab(self, filename): self.fstore.backup_file("/var/kerberos/krb5kdc/kpasswd.keytab") shutil.copy(filename, "/var/kerberos/krb5kdc/kpasswd.keytab") os.chmod("/var/kerberos/krb5kdc/kpasswd.keytab", 0600) def __configure_kdc_account_password(self): hexpwd = '' for x in self.kdc_password: hexpwd += (hex(ord(x))[2:]) self.fstore.backup_file("/var/kerberos/krb5kdc/ldappwd") pwd_fd = open("/var/kerberos/krb5kdc/ldappwd", "w") pwd_fd.write("uid=kdc,cn=sysaccounts,cn=etc,"+self.suffix+"#{HEX}"+hexpwd+"\n") pwd_fd.close() os.chmod("/var/kerberos/krb5kdc/ldappwd", 0600) def __enable(self): self.backup_state("enabled", self.is_enabled()) self.chkconfig_on() def __start_instance(self): try: self.start() except: logging.critical("krb5kdc service failed to start") 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 __ldap_mod(self, ldif): txt = ipautil.template_file(ipautil.SHARE_DIR + ldif, self.sub_dict) fd = ipautil.write_tmp_file(txt) [pw_fd, pw_name] = tempfile.mkstemp() os.write(pw_fd, self.admin_password) os.close(pw_fd) args = ["/usr/bin/ldapmodify", "-h", "127.0.0.1", "-xv", "-D", "cn=Directory Manager", "-y", pw_name, "-f", fd.name] try: try: ipautil.run(args) except ipautil.CalledProcessError, e: logging.critical("Failed to load %s: %s" % (ldif, str(e))) finally: os.remove(pw_name) fd.close() def __configure_sasl_mappings(self): # we need to remove any existing SASL mappings in the directory as otherwise they # they may conflict. There is no way to define the order they are used in atm. # FIXME: for some reason IPAdmin dies here, so we switch # it out for a regular ldapobject. conn = self.conn self.conn = ldapobject.SimpleLDAPObject("ldap://127.0.0.1/") self.conn.bind("cn=directory manager", self.admin_password) try: msgid = self.conn.search("cn=mapping,cn=sasl,cn=config", ldap.SCOPE_ONELEVEL, "(objectclass=nsSaslMapping)") res = self.conn.result(msgid) for r in res[1]: mid = self.conn.delete_s(r[0]) #except LDAPError, e: # logging.critical("Error during SASL mapping removal: %s" % str(e)) except Exception, e: logging.critical("Could not connect to the Directory Server on %s" % self.fqdn) raise e print type(e) print dir(e) raise e self.conn = conn entry = ipaldap.Entry("cn=Full Principal,cn=mapping,cn=sasl,cn=config") entry.setValues("objectclass", "top", "nsSaslMapping") entry.setValues("cn", "Full Principal") entry.setValues("nsSaslMapRegexString", '\(.*\)@\(.*\)') entry.setValues("nsSaslMapBaseDNTemplate", self.suffix) entry.setValues("nsSaslMapFilterTemplate", '(krbPrincipalName=\\1@\\2)') try: self.conn.add_s(entry) except ldap.ALREADY_EXISTS: logging.critical("failed to add Full Principal Sasl mapping") raise e entry = ipaldap.Entry("cn=Name Only,cn=mapping,cn=sasl,cn=config") entry.setValues("objectclass", "top", "nsSaslMapping") entry.setValues("cn", "Name Only") entry.setValues("nsSaslMapRegexString", '\(.*\)') entry.setValues("nsSaslMapBaseDNTemplate", self.suffix) entry.setValues("nsSaslMapFilterTemplate", '(krbPrincipalName=\\1@%s)' % self.realm) try: self.conn.add_s(entry) except ldap.ALREADY_EXISTS: logging.critical("failed to add Name Only Sasl mapping") raise e def __add_krb_entries(self): self.__ldap_mod("kerberos.ldif") def __add_default_acis(self): self.__ldap_mod("default-aci.ldif") def __add_default_keytypes(self): self.__ldap_mod("default-keytypes.ldif") def __create_replica_instance(self): self.__create_instance(replica=True) def __template_file(self, path): template = os.path.join(ipautil.SHARE_DIR, os.path.basename(path) + ".template") conf = ipautil.template_file(template, self.sub_dict) self.fstore.backup_file(path) fd = open(path, "w+") fd.write(conf) fd.close() def __create_instance(self, replica=False): self.__template_file("/var/kerberos/krb5kdc/kdc.conf") self.__template_file("/etc/krb5.conf") self.__template_file("/usr/share/ipa/html/krb5.ini") self.__template_file("/usr/share/ipa/html/krb.con") self.__template_file("/usr/share/ipa/html/krbrealm.con") if not replica: #populate the directory with the realm structure args = ["/usr/kerberos/sbin/kdb5_ldap_util", "-D", "uid=kdc,cn=sysaccounts,cn=etc,"+self.suffix, "-w", self.kdc_password, "create", "-s", "-P", self.master_password, "-r", self.realm, "-subtrees", self.suffix, "-sscope", "sub"] try: ipautil.run(args) except ipautil.CalledProcessError, e: print "Failed to populate the realm structure in kerberos", e def __write_stash_from_ds(self): try: entry = self.conn.getEntry("cn=%s, cn=kerberos, %s" % (self.realm, self.suffix), ldap.SCOPE_SUBTREE) except errors2.NotFound: logging.critical("Could not find master key in DS") raise e krbMKey = pyasn1.codec.ber.decoder.decode(entry.krbmkey) keytype = int(krbMKey[0][1][0]) keydata = str(krbMKey[0][1][1]) format = '=hi%ss' % len(keydata) s = struct.pack(format, keytype, len(keydata), keydata) try: fd = open("/var/kerberos/krb5kdc/.k5."+self.realm, "w") fd.write(s) fd.close() except os.error, e: logging.critical("failed to write stash file") raise e #add the password extop module def __add_pwd_extop_module(self): self.__ldap_mod("pwd-extop-conf.ldif") def __add_master_key(self): #get the Master Key from the stash file try: stash = open("/var/kerberos/krb5kdc/.k5."+self.realm, "r") keytype = struct.unpack('h', stash.read(2))[0] keylen = struct.unpack('i', stash.read(4))[0] keydata = stash.read(keylen) except os.error: logging.critical("Failed to retrieve Master Key from Stash file: %s") #encode it in the asn.1 attribute MasterKey = univ.Sequence() MasterKey.setComponentByPosition(0, univ.Integer(keytype)) MasterKey.setComponentByPosition(1, univ.OctetString(keydata)) krbMKey = univ.Sequence() krbMKey.setComponentByPosition(0, univ.Integer(0)) #we have no kvno krbMKey.setComponentByPosition(1, MasterKey) asn1key = pyasn1.codec.ber.encoder.encode(krbMKey) dn = "cn="+self.realm+",cn=kerberos,"+self.suffix #protect the master key by adding an appropriate deny rule along with the key mod = [(ldap.MOD_ADD, 'aci', ipautil.template_str(KRBMKEY_DENY_ACI, self.sub_dict)), (ldap.MOD_ADD, 'krbMKey', str(asn1key))] try: self.conn.modify_s(dn, mod) except ldap.TYPE_OR_VALUE_EXISTS, e: logging.critical("failed to add master key to kerberos database\n") raise e def __create_ds_keytab(self): ldap_principal = "ldap/" + self.fqdn + "@" + self.realm installutils.kadmin_addprinc(ldap_principal) self.fstore.backup_file("/etc/dirsrv/ds.keytab") installutils.create_keytab("/etc/dirsrv/ds.keytab", ldap_principal) self.fstore.backup_file("/etc/sysconfig/dirsrv") update_key_val_in_file("/etc/sysconfig/dirsrv", "export KRB5_KTNAME", "/etc/dirsrv/ds.keytab") pent = pwd.getpwnam(self.ds_user) os.chown("/etc/dirsrv/ds.keytab", pent.pw_uid, pent.pw_gid) def __create_host_keytab(self): host_principal = "host/" + self.fqdn + "@" + self.realm installutils.kadmin_addprinc(host_principal) self.fstore.backup_file("/etc/krb5.keytab") installutils.create_keytab("/etc/krb5.keytab", host_principal) # Make sure access is strictly reserved to root only for now os.chown("/etc/krb5.keytab", 0, 0) os.chmod("/etc/krb5.keytab", 0600) def __export_kadmin_changepw_keytab(self): installutils.kadmin_modprinc("kadmin/changepw", "+requires_preauth") self.fstore.backup_file("/var/kerberos/krb5kdc/kpasswd.keytab") installutils.create_keytab("/var/kerberos/krb5kdc/kpasswd.keytab", "kadmin/changepw") self.fstore.backup_file("/etc/sysconfig/ipa_kpasswd") update_key_val_in_file("/etc/sysconfig/ipa_kpasswd", "export KRB5_KTNAME", "/var/kerberos/krb5kdc/kpasswd.keytab") def uninstall(self): self.kpasswd.uninstall() running = self.restore_state("running") enabled = self.restore_state("enabled") try: self.stop() except: pass for f in ["/var/kerberos/krb5kdc/ldappwd", "/var/kerberos/krb5kdc/kdc.conf", "/etc/krb5.conf"]: try: self.fstore.restore_file(f) except ValueError, error: logging.debug(error) pass if not enabled is None and not enabled: self.chkconfig_off() if not running is None and running: self.start()