freeipa/ipaserver/install/dnskeysyncinstance.py

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#
# Copyright (C) 2014 FreeIPA Contributors see COPYING for license
#
from __future__ import print_function, absolute_import
import logging
import errno
import os
import pwd
import grp
import shutil
import stat
import ldap
from ipaserver import p11helper as _ipap11helper
from ipapython.dnsutil import DNSName
from ipaserver.install import service
from ipaserver.install import installutils
from ipapython.dn import DN
from ipapython import directivesetter
from ipapython import ipautil
from ipaplatform.constants import constants
from ipaplatform.paths import paths
from ipalib import errors, api
from ipalib.constants import SOFTHSM_DNSSEC_TOKEN_LABEL
from ipaserver.install.bindinstance import dns_container_exists
logger = logging.getLogger(__name__)
replica_keylabel_template = u"dnssec-replica:%s"
def dnssec_container_exists(suffix):
"""
Test whether the dns container exists.
"""
assert isinstance(suffix, DN)
return api.Backend.ldap2.entry_exists(
DN(('cn', 'sec'), ('cn', 'dns'), suffix))
def remove_replica_public_keys(hostname):
keysyncd = DNSKeySyncInstance()
keysyncd.remove_replica_public_keys(hostname)
class DNSKeySyncInstance(service.Service):
def __init__(self, fstore=None, logger=logger):
super(DNSKeySyncInstance, self).__init__(
"ipa-dnskeysyncd",
service_desc="DNS key synchronization service",
fstore=fstore,
service_prefix=u'ipa-dnskeysyncd',
keytab=paths.IPA_DNSKEYSYNCD_KEYTAB
)
self.extra_config = [u'dnssecVersion 1', ] # DNSSEC enabled
self.named_uid = None
self.named_gid = None
self.ods_uid = None
self.ods_gid = None
suffix = ipautil.dn_attribute_property('_suffix')
def set_dyndb_ldap_workdir_permissions(self):
"""
Setting up correct permissions to allow write/read access for daemons
"""
if self.named_uid is None:
self.named_uid = self.__get_named_uid()
if self.named_gid is None:
self.named_gid = self.__get_named_gid()
if not os.path.exists(paths.BIND_LDAP_DNS_IPA_WORKDIR):
os.mkdir(paths.BIND_LDAP_DNS_IPA_WORKDIR, 0o770)
# dnssec daemons require to have access into the directory
os.chmod(paths.BIND_LDAP_DNS_IPA_WORKDIR, 0o770)
os.chown(paths.BIND_LDAP_DNS_IPA_WORKDIR, self.named_uid,
self.named_gid)
def remove_replica_public_keys(self, replica_fqdn):
ldap = api.Backend.ldap2
dn_base = DN(('cn', 'keys'), ('cn', 'sec'), ('cn', 'dns'), api.env.basedn)
keylabel = replica_keylabel_template % DNSName(replica_fqdn).\
make_absolute().canonicalize().ToASCII()
# get old keys from LDAP
search_kw = {
'objectclass': u"ipaPublicKeyObject",
'ipk11Label': keylabel,
'ipk11Wrap': True,
}
filter = ldap.make_filter(search_kw, rules=ldap.MATCH_ALL)
entries, _truncated = ldap.find_entries(filter=filter, base_dn=dn_base)
for entry in entries:
ldap.delete_entry(entry)
def start_dnskeysyncd(self):
print("Restarting ipa-dnskeysyncd")
self.__start()
def create_instance(self, fqdn, realm_name):
self.fqdn = fqdn
self.realm = realm_name
self.suffix = ipautil.realm_to_suffix(self.realm)
try:
self.stop()
except Exception:
pass
# checking status step must be first
self.step("checking status", self.__check_dnssec_status)
self.step("setting up bind-dyndb-ldap working directory",
self.set_dyndb_ldap_workdir_permissions)
self.step("setting up kerberos principal", self.__setup_principal)
self.step("setting up SoftHSM", self.__setup_softhsm)
self.step("adding DNSSEC containers", self.__setup_dnssec_containers)
self.step("creating replica keys", self.__setup_replica_keys)
self.step("configuring ipa-dnskeysyncd to start on boot", self.__enable)
# we need restart named after setting up this service
self.start_creation()
def __get_named_uid(self):
try:
return pwd.getpwnam(constants.NAMED_USER).pw_uid
except KeyError:
raise RuntimeError("Named UID not found")
def __get_named_gid(self):
try:
return grp.getgrnam(constants.NAMED_GROUP).gr_gid
except KeyError:
raise RuntimeError("Named GID not found")
def __check_dnssec_status(self):
self.named_uid = self.__get_named_uid()
self.named_gid = self.__get_named_gid()
try:
self.ods_uid = pwd.getpwnam(constants.ODS_USER).pw_uid
except KeyError:
raise RuntimeError("OpenDNSSEC UID not found")
try:
self.ods_gid = grp.getgrnam(constants.ODS_GROUP).gr_gid
except KeyError:
raise RuntimeError("OpenDNSSEC GID not found")
if not dns_container_exists(self.suffix):
raise RuntimeError("DNS container does not exist")
# ready to be installed, storing a state is required to run uninstall
self.backup_state("configured", True)
def __setup_dnssec_containers(self):
"""
Setup LDAP containers for DNSSEC
"""
if dnssec_container_exists(self.suffix):
logger.info("DNSSEC container exists (step skipped)")
return
self._ldap_mod("dnssec.ldif", {'SUFFIX': self.suffix, })
def __setup_softhsm(self):
assert self.ods_uid is not None
assert self.named_gid is not None
token_dir_exists = os.path.exists(paths.DNSSEC_TOKENS_DIR)
# create dnssec directory
if not os.path.exists(paths.IPA_DNSSEC_DIR):
logger.debug("Creating %s directory", paths.IPA_DNSSEC_DIR)
os.mkdir(paths.IPA_DNSSEC_DIR)
os.chmod(paths.IPA_DNSSEC_DIR, 0o770)
# chown ods:named
os.chown(paths.IPA_DNSSEC_DIR, self.ods_uid, self.named_gid)
# setup softhsm2 config file
softhsm_conf_txt = ("# SoftHSM v2 configuration file \n"
"# File generated by IPA instalation\n"
"directories.tokendir = %(tokens_dir)s\n"
"objectstore.backend = file") % {
'tokens_dir': paths.DNSSEC_TOKENS_DIR
}
logger.debug("Creating new softhsm config file")
named_fd = open(paths.DNSSEC_SOFTHSM2_CONF, 'w')
named_fd.seek(0)
named_fd.truncate(0)
named_fd.write(softhsm_conf_txt)
named_fd.close()
os.chmod(paths.DNSSEC_SOFTHSM2_CONF, 0o644)
# setting up named to use softhsm2
if not self.fstore.has_file(paths.SYSCONFIG_NAMED):
self.fstore.backup_file(paths.SYSCONFIG_NAMED)
# setting up named and ipa-dnskeysyncd to use our softhsm2 config
for sysconfig in [paths.SYSCONFIG_NAMED,
paths.SYSCONFIG_IPA_DNSKEYSYNCD]:
directivesetter.set_directive(sysconfig, 'SOFTHSM2_CONF',
paths.DNSSEC_SOFTHSM2_CONF,
quotes=False, separator='=')
if (token_dir_exists and os.path.exists(paths.DNSSEC_SOFTHSM_PIN) and
os.path.exists(paths.DNSSEC_SOFTHSM_PIN_SO)):
# there is initialized softhsm
return
# remove old tokens
if token_dir_exists:
logger.debug('Removing old tokens directory %s',
paths.DNSSEC_TOKENS_DIR)
shutil.rmtree(paths.DNSSEC_TOKENS_DIR)
# create tokens subdirectory
logger.debug('Creating tokens %s directory', paths.DNSSEC_TOKENS_DIR)
# sticky bit is required by daemon
os.mkdir(paths.DNSSEC_TOKENS_DIR)
os.chmod(paths.DNSSEC_TOKENS_DIR, 0o770 | stat.S_ISGID)
# chown to ods:named
os.chown(paths.DNSSEC_TOKENS_DIR, self.ods_uid, self.named_gid)
# generate PINs for softhsm
pin_length = 30 # Bind allows max 32 bytes including ending '\0'
pin = ipautil.ipa_generate_password(
entropy_bits=0, special=None, min_len=pin_length)
pin_so = ipautil.ipa_generate_password(
entropy_bits=0, special=None, min_len=pin_length)
logger.debug("Saving user PIN to %s", paths.DNSSEC_SOFTHSM_PIN)
named_fd = open(paths.DNSSEC_SOFTHSM_PIN, 'w')
named_fd.seek(0)
named_fd.truncate(0)
named_fd.write(pin)
named_fd.close()
os.chmod(paths.DNSSEC_SOFTHSM_PIN, 0o770)
# chown to ods:named
os.chown(paths.DNSSEC_SOFTHSM_PIN, self.ods_uid, self.named_gid)
logger.debug("Saving SO PIN to %s", paths.DNSSEC_SOFTHSM_PIN_SO)
named_fd = open(paths.DNSSEC_SOFTHSM_PIN_SO, 'w')
named_fd.seek(0)
named_fd.truncate(0)
named_fd.write(pin_so)
named_fd.close()
# owner must be root
os.chmod(paths.DNSSEC_SOFTHSM_PIN_SO, 0o400)
# initialize SoftHSM
command = [
paths.SOFTHSM2_UTIL,
'--init-token',
'--free', # use random free slot
'--label', SOFTHSM_DNSSEC_TOKEN_LABEL,
'--pin', pin,
'--so-pin', pin_so,
]
logger.debug("Initializing tokens")
os.environ["SOFTHSM2_CONF"] = paths.DNSSEC_SOFTHSM2_CONF
ipautil.run(command, nolog=(pin, pin_so,))
def __setup_replica_keys(self):
keylabel = replica_keylabel_template % DNSName(self.fqdn).\
make_absolute().canonicalize().ToASCII()
ldap = api.Backend.ldap2
dn_base = DN(('cn', 'keys'), ('cn', 'sec'), ('cn', 'dns'), api.env.basedn)
with open(paths.DNSSEC_SOFTHSM_PIN, "r") as f:
pin = f.read()
os.environ["SOFTHSM2_CONF"] = paths.DNSSEC_SOFTHSM2_CONF
p11 = _ipap11helper.P11_Helper(
SOFTHSM_DNSSEC_TOKEN_LABEL, pin, paths.LIBSOFTHSM2_SO)
try:
# generate replica keypair
logger.debug("Creating replica's key pair")
key_id = None
while True:
# check if key with this ID exist in softHSM
key_id = _ipap11helper.gen_key_id()
replica_pubkey_dn = DN(('ipk11UniqueId', 'autogenerate'), dn_base)
pub_keys = p11.find_keys(_ipap11helper.KEY_CLASS_PUBLIC_KEY,
label=keylabel,
id=key_id)
if pub_keys:
# key with id exists
continue
priv_keys = p11.find_keys(_ipap11helper.KEY_CLASS_PRIVATE_KEY,
label=keylabel,
id=key_id)
if not priv_keys:
break # we found unique id
public_key_handle, _privkey_handle = p11.generate_replica_key_pair(
keylabel, key_id,
pub_cka_verify=False,
pub_cka_verify_recover=False,
pub_cka_wrap=True,
priv_cka_unwrap=True,
priv_cka_sensitive=True,
priv_cka_extractable=False)
# export public key
public_key_blob = p11.export_public_key(public_key_handle)
# save key to LDAP
replica_pubkey_objectclass = [
'ipk11Object', 'ipk11PublicKey', 'ipaPublicKeyObject', 'top'
]
kw = {
'objectclass': replica_pubkey_objectclass,
'ipk11UniqueId': [u'autogenerate'],
'ipk11Label': [keylabel],
'ipaPublicKey': [public_key_blob],
'ipk11Id': [key_id],
'ipk11Wrap': [True],
'ipk11Verify': [False],
'ipk11VerifyRecover': [False],
}
logger.debug("Storing replica public key to LDAP, %s",
replica_pubkey_dn)
entry = ldap.make_entry(replica_pubkey_dn, **kw)
ldap.add_entry(entry)
logger.debug("Replica public key stored")
logger.debug("Setting CKA_WRAP=False for old replica keys")
# first create new keys, we don't want disable keys before, we
# have new keys in softhsm and LDAP
# get replica pub keys with CKA_WRAP=True
replica_pub_keys = p11.find_keys(_ipap11helper.KEY_CLASS_PUBLIC_KEY,
label=keylabel,
cka_wrap=True)
# old keys in softHSM
for handle in replica_pub_keys:
# don't disable wrapping for new key
# compare IDs not handle
if key_id != p11.get_attribute(handle, _ipap11helper.CKA_ID):
p11.set_attribute(handle, _ipap11helper.CKA_WRAP, False)
# get old keys from LDAP
search_kw = {
'objectclass': u"ipaPublicKeyObject",
'ipk11Label': keylabel,
'ipk11Wrap': True,
}
filter = ldap.make_filter(search_kw, rules=ldap.MATCH_ALL)
entries, _truncated = ldap.find_entries(filter=filter,
base_dn=dn_base)
for entry in entries:
# don't disable wrapping for new key
if entry.single_value['ipk11Id'] != key_id:
entry['ipk11Wrap'] = [False]
ldap.update_entry(entry)
finally:
p11.finalize()
# change tokens mod/owner
logger.debug("Changing ownership of token files")
for (root, dirs, files) in os.walk(paths.DNSSEC_TOKENS_DIR):
for directory in dirs:
dir_path = os.path.join(root, directory)
os.chmod(dir_path, 0o770 | stat.S_ISGID)
# chown to ods:named
os.chown(dir_path, self.ods_uid, self.named_gid)
for filename in files:
file_path = os.path.join(root, filename)
os.chmod(file_path, 0o770 | stat.S_ISGID)
# chown to ods:named
os.chown(file_path, self.ods_uid, self.named_gid)
def __enable(self):
try:
self.ldap_configure('DNSKeySync', self.fqdn, None,
self.suffix, self.extra_config)
except errors.DuplicateEntry:
logger.error("DNSKeySync service already exists")
def __setup_principal(self):
assert self.ods_gid is not None
ipautil.remove_keytab(self.keytab)
installutils.kadmin_addprinc(self.principal)
# Store the keytab on disk
installutils.create_keytab(self.keytab, self.principal)
p = self.move_service(self.principal)
if p is None:
# the service has already been moved, perhaps we're doing a DNS reinstall
dnssynckey_principal_dn = DN(
('krbprincipalname', self.principal),
('cn', 'services'), ('cn', 'accounts'), self.suffix)
else:
dnssynckey_principal_dn = p
# Make sure access is strictly reserved to the named user
os.chown(self.keytab, 0, self.ods_gid)
os.chmod(self.keytab, 0o440)
dns_group = DN(('cn', 'DNS Servers'), ('cn', 'privileges'),
('cn', 'pbac'), self.suffix)
mod = [(ldap.MOD_ADD, 'member', dnssynckey_principal_dn)]
try:
api.Backend.ldap2.modify_s(dns_group, mod)
except ldap.TYPE_OR_VALUE_EXISTS:
pass
except Exception as e:
logger.critical("Could not modify principal's %s entry: %s",
dnssynckey_principal_dn, str(e))
raise
# bind-dyndb-ldap persistent search feature requires both size and time
# limit-free connection
mod = [(ldap.MOD_REPLACE, 'nsTimeLimit', '-1'),
(ldap.MOD_REPLACE, 'nsSizeLimit', '-1'),
(ldap.MOD_REPLACE, 'nsIdleTimeout', '-1'),
(ldap.MOD_REPLACE, 'nsLookThroughLimit', '-1')]
try:
api.Backend.ldap2.modify_s(dnssynckey_principal_dn, mod)
except Exception as e:
logger.critical("Could not set principal's %s LDAP limits: %s",
dnssynckey_principal_dn, str(e))
raise
def __start(self):
try:
self.restart()
except Exception as e:
print("Failed to start ipa-dnskeysyncd")
logger.debug("Failed to start ipa-dnskeysyncd: %s", e)
def uninstall(self):
if self.is_configured():
self.print_msg("Unconfiguring %s" % self.service_name)
# Just eat states
self.restore_state("running")
self.restore_state("enabled")
self.restore_state("configured")
# stop and disable service (IPA service, we do not need it anymore)
self.stop()
self.disable()
for f in [paths.SYSCONFIG_NAMED]:
try:
self.fstore.restore_file(f)
except ValueError as error:
logger.debug('%s', error)
# remove softhsm pin, to make sure new installation will generate
# new token database
# do not delete *so pin*, user can need it to get token data
ipautil.remove_file(paths.DNSSEC_SOFTHSM_PIN)
ipautil.remove_file(paths.DNSSEC_SOFTHSM2_CONF)
try:
shutil.rmtree(paths.DNSSEC_TOKENS_DIR)
except OSError as e:
if e.errno != errno.ENOENT:
logger.exception(
"Failed to remove %s", paths.DNSSEC_TOKENS_DIR
)
ipautil.remove_keytab(self.keytab)