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freeipa/daemons/dnssec/ipa-ods-exporter.in
Florence Blanc-Renaud 8080bf7b35 Support OpenDNSSEC 2.1: new ods-signer protocol 
The communication between ods-signer and the socket-activated process
has changed with OpenDNSSEC 2.1. Adapt ipa-ods-exporter to support also
the new protocol.

The internal database was also modified. Add a wrapper calling the
right code (table names hab=ve changed, as well as table columns).

With OpenDNSSEC the policy also needs to be explicitely loaded after
ods-enforcer-db-setup has been run, with
ods-enforcer policy import

The command ods-ksmutil notify must be replace with ods-enforce flush.

Related: https://pagure.io/freeipa/issue/8214
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Christian Heimes <cheimes@redhat.com>
2020-03-12 21:48:25 +01:00

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#!/usr/bin/python3
#
# Copyright (C) 2014 FreeIPA Contributors see COPYING for license
#
"""
This is FreeIPA's replacement for signerd from OpenDNSSEC suite version 1.4.x.
This program uses the same socket and protocol as original signerd and should
be activated via systemd socket activation using "ods-signer" command line
utility.
Alternativelly, it can be called directly and a command can be supplied as
first command line argument.
Purpose of this replacement is to upload keys generated by OpenDNSSEC to LDAP.
"""
from __future__ import print_function
from datetime import datetime
import logging
import os
import socket
import select
import sys
import traceback
import dateutil.tz
import dns.dnssec
from gssapi.exceptions import GSSError
import six
import systemd.daemon
import systemd.journal
import ipalib
from ipalib.constants import SOFTHSM_DNSSEC_TOKEN_LABEL
from ipalib.install.kinit import kinit_keytab
from ipapython.dn import DN
from ipapython import ipaldap
from ipaplatform.paths import paths
from ipaserver.dnssec.abshsm import sync_pkcs11_metadata, wrappingmech_name2id
from ipaserver.dnssec.ldapkeydb import LdapKeyDB, str_hexlify
from ipaserver.dnssec.localhsm import LocalHSM
from ipaserver.dnssec import opendnssec
logger = logging.getLogger(os.path.basename(__file__))
DAEMONNAME = 'ipa-ods-exporter'
PRINCIPAL = None # not initialized yet
WORKDIR = os.path.join(paths.VAR_OPENDNSSEC_DIR ,'tmp')
KEYTAB_FB = paths.IPA_ODS_EXPORTER_KEYTAB
ODS_SE_MAXLINE = 1024 # from ODS common/config.h
ODS_DB_LOCK_PATH = "%s%s" % (paths.OPENDNSSEC_KASP_DB, '.our_lock')
SECRETKEY_WRAPPING_MECH = 'rsaPkcsOaep'
PRIVKEY_WRAPPING_MECH = 'aesKeyWrapPad'
# Constants from OpenDNSSEC's enforcer/ksm/include/ksm/ksm.h
KSM_STATE_PUBLISH = 2
KSM_STATE_READY = 3
KSM_STATE_ACTIVE = 4
KSM_STATE_RETIRE = 5
KSM_STATE_DEAD = 6
KSM_STATE_KEYPUBLISH = 10
# DNSKEY flag constants
dnskey_flag_by_value = {
0x0001: 'SEP',
0x0080: 'REVOKE',
0x0100: 'ZONE'
}
def dnskey_flags_to_text_set(flags):
"""Convert a DNSKEY flags value to set texts
@rtype: set([string])"""
flags_set = set()
mask = 0x1
while mask <= 0x8000:
if flags & mask:
text = dnskey_flag_by_value.get(mask)
if not text:
text = hex(mask)
flags_set.add(text)
mask <<= 1
return flags_set
def datetime2ldap(dt):
return dt.strftime(ipalib.constants.LDAP_GENERALIZED_TIME_FORMAT)
def sql2datetime(sql_time):
"""Convert SQL date format from local time zone into UTC."""
localtz = dateutil.tz.tzlocal()
localtime = datetime.strptime(sql_time, "%Y-%m-%d %H:%M:%S").replace(
tzinfo=localtz)
utctz = dateutil.tz.gettz('UTC')
return localtime.astimezone(utctz)
def sql2datetimes(row):
row2key_map = {'generate': 'idnsSecKeyCreated',
'publish': 'idnsSecKeyPublish',
'active': 'idnsSecKeyActivate',
'retire': 'idnsSecKeyInactive',
'dead': 'idnsSecKeyDelete'}
times = {}
for column, key in row2key_map.items():
if row[column] is not None:
times[key] = sql2datetime(row[column])
return times
def sql2ldap_algorithm(sql_algorithm):
return {"idnsSecAlgorithm": dns.dnssec.algorithm_to_text(sql_algorithm)}
def sql2ldap_flags(sql_flags):
dns_flags = dnskey_flags_to_text_set(sql_flags)
ldap_flags = {}
for flag in dns_flags:
attr = 'idnsSecKey%s' % flag
ldap_flags[attr] = 'TRUE'
return ldap_flags
def sql2ldap_keyid(sql_keyid):
assert len(sql_keyid) % 2 == 0
assert len(sql_keyid) > 0
# TODO: this is huge hack. BIND has some problems with % notation in URIs.
# Workaround: OpenDNSSEC uses same value for ID also for label (but in hex).
uri = "pkcs11:object=%s" % sql_keyid
#uri += '%'.join(sql_keyid[i:i+2] for i in range(0, len(sql_keyid), 2))
return {"idnsSecKeyRef": uri}
def ods2bind_timestamps(key_state, key_type, ods_times):
"""Transform (timestamps and key states) from ODS to set of BIND timestamps
with equivalent meaning. At the same time, remove timestamps
for future/planned state transitions to prevent ODS & BIND
from desynchronizing.
OpenDNSSEC database may contain timestamps for state transitions planned
in the future, but timestamp itself is not sufficient information because
there could be some additional condition which is guaded by OpenDNSSEC
itself.
BIND works directly with timestamps without any additional conditions.
This difference causes problem when state transition planned in OpenDNSSEC
does not happen as originally planned for some reason.
At the same time, this difference causes problem when OpenDNSSEC on DNSSEC
key master and BIND instances on replicas are not synchronized. This
happens when DNSSEC key master is down, or a replication is down. Even
a temporary desynchronization could cause DNSSEC validation failures
which could have huge impact.
To prevent this problem, this function removes all timestamps corresponding
to future state transitions. As a result, BIND will not do state transition
until it happens in OpenDNSSEC first and until the change is replicated.
Also, timestamp mapping depends on key type and is not 1:1.
For detailed description of the mapping please see
https://fedorahosted.org/bind-dyndb-ldap/wiki/BIND9/Design/DNSSEC/OpenDNSSEC2BINDKeyStates
"""
bind_times = {}
# idnsSecKeyCreated is equivalent to SQL column 'created'
bind_times['idnsSecKeyCreated'] = ods_times['idnsSecKeyCreated']
# set of key states where publishing in DNS zone is desired is taken from
# opendnssec/enforcer/ksm/ksm_request.c:KsmRequestIssueKeys()
# TODO: support for RFC 5011, requires OpenDNSSEC v1.4.8+
if ('idnsSecKeyPublish' in ods_times and
key_state in {KSM_STATE_PUBLISH, KSM_STATE_READY, KSM_STATE_ACTIVE,
KSM_STATE_RETIRE, KSM_STATE_KEYPUBLISH}):
bind_times['idnsSecKeyPublish'] = ods_times['idnsSecKeyPublish']
# ZSK and KSK handling differs in enforcerd, see
# opendnssec/enforcer/enforcerd/enforcer.c:commKeyConfig()
if key_type == 'ZSK':
# idnsSecKeyActivate cannot be set before the key reaches ACTIVE state
if ('idnsSecKeyActivate' in ods_times and
key_state in {KSM_STATE_ACTIVE, KSM_STATE_RETIRE, KSM_STATE_DEAD}):
bind_times['idnsSecKeyActivate'] = ods_times['idnsSecKeyActivate']
# idnsSecKeyInactive cannot be set before the key reaches RETIRE state
if ('idnsSecKeyInactive' in ods_times and
key_state in {KSM_STATE_RETIRE, KSM_STATE_DEAD}):
bind_times['idnsSecKeyInactive'] = ods_times['idnsSecKeyInactive']
elif key_type == 'KSK':
# KSK is special: it is used for signing as long as it is in zone
if ('idnsSecKeyPublish' in ods_times and
key_state in {KSM_STATE_PUBLISH, KSM_STATE_READY, KSM_STATE_ACTIVE,
KSM_STATE_RETIRE, KSM_STATE_KEYPUBLISH}):
bind_times['idnsSecKeyActivate'] = ods_times['idnsSecKeyPublish']
# idnsSecKeyInactive is ignored for KSK on purpose
else:
raise ValueError("unsupported key type %s" % key_type)
# idnsSecKeyDelete is relevant only in DEAD state
if 'idnsSecKeyDelete' in ods_times and key_state == KSM_STATE_DEAD:
bind_times['idnsSecKeyDelete'] = ods_times['idnsSecKeyDelete']
return bind_times
def get_ldap_zone(ldap, dns_base, name):
zone_names = ["%s." % name, name]
# find zone object: name can optionally end with period
ldap_zone = None
for zone_name in zone_names:
zone_base = DN("idnsname=%s" % zone_name, dns_base)
try:
ldap_zone = ldap.get_entry(dn=zone_base,
attrs_list=["idnsname"])
break
except ipalib.errors.NotFound:
continue
if ldap_zone is None:
raise ipalib.errors.NotFound(
reason='DNS zone "%s" not found in LDAP' % name)
return ldap_zone
def get_ldap_keys_dn(zone_dn):
"""Container DN"""
return DN("cn=keys", zone_dn)
def get_ldap_keys(ldap, zone_dn):
"""Keys objects"""
keys_dn = get_ldap_keys_dn(zone_dn)
ldap_filter = ldap.make_filter_from_attr('objectClass', 'idnsSecKey')
ldap_keys = ldap.get_entries(base_dn=keys_dn, filter=ldap_filter)
return ldap_keys
def get_ods_keys(zone_name):
# get zone ID
rows = db.get_zone_id(zone_name)
if len(rows) != 1:
raise ValueError("exactly one DNS zone should exist in ODS DB")
zone_id = rows[0]
# get relevant keys for given zone ID:
# ignore keys which were generated but not used yet
# key state check is using constants from
# OpenDNSSEC's enforcer/ksm/include/ksm/ksm.h
# WARNING! OpenDNSSEC version 1 and 2 are using different constants!
rows = db.get_keys_for_zone(zone_id)
keys = {}
for row in rows:
key_data = sql2ldap_flags(row['keytype'])
if key_data.get('idnsSecKeyZONE') != 'TRUE':
raise ValueError("unexpected key type 0x%x" % row['keytype'])
if key_data.get('idnsSecKeySEP', 'FALSE') == 'TRUE':
key_type = 'KSK'
else:
key_type = 'ZSK'
# transform key state to timestamps for BIND with equivalent semantics
ods_times = sql2datetimes(row)
key_data.update(
ods2bind_timestamps(row['state'], key_type, ods_times)
)
key_data.update(sql2ldap_algorithm(row['algorithm']))
key_id = "%s-%s-%s" % (
key_type,
datetime2ldap(key_data['idnsSecKeyCreated']),
row['HSMkey_id']
)
key_data.update(sql2ldap_keyid(row['HSMkey_id']))
keys[key_id] = key_data
logger.debug("key %s metadata: %s", key_id, key_data)
return keys
def sync_set_metadata_2ldap(name, source_set, target_set):
"""sync metadata from source key set to target key set in LDAP
Keys not present in both sets are left intact."""
matching_keys = set(source_set.keys()).intersection(set(target_set.keys()))
logger.info("%s: keys in local HSM & LDAP: %s",
name, hex_set(matching_keys))
for key_id in matching_keys:
sync_pkcs11_metadata(name, source_set[key_id], target_set[key_id])
def ldap2master_replica_keys_sync(ldapkeydb, localhsm):
"""LDAP=>master's local HSM replica key synchronization"""
# import new replica keys from LDAP
logger.debug("replica pub keys in LDAP: %s",
hex_set(ldapkeydb.replica_pubkeys_wrap))
logger.debug("replica pub keys in SoftHSM: %s",
hex_set(localhsm.replica_pubkeys_wrap))
new_replica_keys = set(ldapkeydb.replica_pubkeys_wrap.keys()) \
- set(localhsm.replica_pubkeys_wrap.keys())
logger.info("new replica keys in LDAP: %s",
hex_set(new_replica_keys))
for key_id in new_replica_keys:
new_key_ldap = ldapkeydb.replica_pubkeys_wrap[key_id]
logger.debug('label=%s, id=%s, data=%s',
new_key_ldap['ipk11label'],
str_hexlify(new_key_ldap['ipk11id']),
str_hexlify(new_key_ldap['ipapublickey']))
localhsm.import_public_key(new_key_ldap, new_key_ldap['ipapublickey'])
# set CKA_WRAP = FALSE for all replica keys removed from LDAP
removed_replica_keys = set(localhsm.replica_pubkeys_wrap.keys()) \
- set(ldapkeydb.replica_pubkeys_wrap.keys())
logger.info("obsolete replica keys in local HSM: %s",
hex_set(removed_replica_keys))
for key_id in removed_replica_keys:
localhsm.replica_pubkeys_wrap[key_id]['ipk11wrap'] = False
# synchronize replica key attributes from LDAP to local HSM
sync_set_metadata_2ldap('ldap2master_replica',
localhsm.replica_pubkeys_wrap,
ldapkeydb.replica_pubkeys_wrap)
def master2ldap_master_keys_sync(ldapkeydb, localhsm):
## master key -> LDAP synchronization
# export new master keys to LDAP
new_master_keys = set(localhsm.master_keys.keys()) \
- set(ldapkeydb.master_keys.keys())
logger.debug("master keys in local HSM: %s",
hex_set(localhsm.master_keys.keys()))
logger.debug("master keys in LDAP HSM: %s",
hex_set(ldapkeydb.master_keys.keys()))
logger.debug("new master keys in local HSM: %s",
hex_set(new_master_keys))
for mkey_id in new_master_keys:
mkey = localhsm.master_keys[mkey_id]
ldapkeydb.import_master_key(mkey)
# re-fill cache with keys we just added
ldapkeydb.flush()
logger.debug('master keys in LDAP after flush: %s',
hex_set(ldapkeydb.master_keys))
# synchronize master key metadata to LDAP
for mkey_id, mkey_local in localhsm.master_keys.items():
logger.debug('synchronizing master key metadata: 0x%s',
str_hexlify(mkey_id))
sync_pkcs11_metadata('master2ldap_master', mkey_local, ldapkeydb.master_keys[mkey_id])
# re-wrap all master keys in LDAP with new replica keys (as necessary)
enabled_replica_key_ids = set(localhsm.replica_pubkeys_wrap.keys())
logger.debug('enabled replica key ids: %s',
hex_set(enabled_replica_key_ids))
for mkey_id, mkey_ldap in ldapkeydb.master_keys.items():
logger.debug('processing master key data: 0x%s',
str_hexlify(mkey_id))
# check that all active replicas have own copy of master key
used_replica_keys = set()
for wrapped_entry in mkey_ldap.wrapped_entries:
matching_keys = localhsm.find_keys(
uri=wrapped_entry.single_value['ipaWrappingKey'])
for matching_key in matching_keys.values():
label = matching_key['ipk11label']
if not label.startswith(u'dnssec-replica:'):
raise ValueError(
"Wrapped key '%s' refers to PKCS#11 URI '%s' which "
"is not a known DNSSEC replica key: label '%s' "
"does not start with 'dnssec-replica:' prefix" % (
wrapped_entry.dn,
wrapped_entry['ipaWrappingKey'],
label
)
)
used_replica_keys.add(matching_key['ipk11id'])
new_replica_keys = enabled_replica_key_ids - used_replica_keys
logger.debug('master key 0x%s is not wrapped with replica keys %s',
str_hexlify(mkey_id), hex_set(new_replica_keys))
# wrap master key with new replica keys
mkey_local = localhsm.find_keys(id=mkey_id).popitem()[1]
for replica_key_id in new_replica_keys:
logger.info('adding master key 0x%s wrapped with replica key 0x%s',
str_hexlify(mkey_id), str_hexlify(replica_key_id))
replica_key = localhsm.replica_pubkeys_wrap[replica_key_id]
keydata = localhsm.p11.export_wrapped_key(mkey_local.handle,
replica_key.handle,
wrappingmech_name2id[SECRETKEY_WRAPPING_MECH])
mkey_ldap.add_wrapped_data(keydata, SECRETKEY_WRAPPING_MECH,
replica_key_id)
ldapkeydb.flush()
def master2ldap_zone_keys_sync(ldapkeydb, localhsm):
"""add and update zone key material from local HSM to LDAP
No key material will be removed, only new keys will be added or updated.
Key removal is hanled by master2ldap_zone_keys_purge()."""
keypairs_ldap = ldapkeydb.zone_keypairs
logger.debug("zone keys in LDAP: %s", hex_set(keypairs_ldap))
pubkeys_local = localhsm.zone_pubkeys
privkeys_local = localhsm.zone_privkeys
logger.debug("zone keys in local HSM: %s", hex_set(privkeys_local))
if set(pubkeys_local) != set(privkeys_local):
raise ValueError(
"IDs of private and public keys for DNS zones in local HSM does "
"not match to key pairs: %s vs. %s" % (
hex_set(pubkeys_local), hex_set(privkeys_local)
)
)
new_keys = set(pubkeys_local) - set(keypairs_ldap)
logger.debug("new zone keys in local HSM: %s", hex_set(new_keys))
mkey = localhsm.active_master_key
# wrap each new zone key pair with selected master key
for zkey_id in new_keys:
pubkey = pubkeys_local[zkey_id]
pubkey_data = localhsm.p11.export_public_key(pubkey.handle)
privkey = privkeys_local[zkey_id]
privkey_data = localhsm.p11.export_wrapped_key(privkey.handle,
wrapping_key=mkey.handle,
wrapping_mech=wrappingmech_name2id[PRIVKEY_WRAPPING_MECH])
ldapkeydb.import_zone_key(pubkey, pubkey_data, privkey, privkey_data,
PRIVKEY_WRAPPING_MECH, mkey['ipk11id'])
sync_set_metadata_2ldap('master2ldap_zone_keys', pubkeys_local, keypairs_ldap)
sync_set_metadata_2ldap('master2ldap_zone_keys', privkeys_local, keypairs_ldap)
ldapkeydb.flush()
def master2ldap_zone_keys_purge(ldapkeydb, localhsm):
"""purge removed key material from LDAP (but not metadata)
Keys which are present in LDAP but not in local HSM will be removed.
Key metadata must be removed first so references to removed key material
are removed before actually removing the keys."""
keypairs_ldap = ldapkeydb.zone_keypairs
logger.debug("zone keys in LDAP: %s", hex_set(keypairs_ldap))
pubkeys_local = localhsm.zone_pubkeys
privkeys_local = localhsm.zone_privkeys
logger.debug("zone keys in local HSM: %s", hex_set(privkeys_local))
if set(pubkeys_local) != set(privkeys_local):
raise ValueError(
"IDs of private and public keys for DNS zones in local HSM does "
"not match to key pairs: %s vs. %s" % (
hex_set(pubkeys_local), hex_set(privkeys_local)
)
)
deleted_key_ids = set(keypairs_ldap) - set(pubkeys_local)
logger.debug("zone keys deleted from local HSM but present in LDAP: %s",
hex_set(deleted_key_ids))
for zkey_id in deleted_key_ids:
keypairs_ldap[zkey_id].schedule_deletion()
ldapkeydb.flush()
def hex_set(s):
out = set()
for i in s:
out.add("0x%s" % str_hexlify(i))
return out
def receive_systemd_command():
fds = systemd.daemon.listen_fds()
if len(fds) != 1:
raise KeyError('Exactly one socket is expected.')
sck = socket.fromfd(fds[0], socket.AF_UNIX, socket.SOCK_STREAM)
timeout = 1 # give the socket a bit of time
rlist, _wlist, _xlist = select.select([sck], [], [], timeout)
if not rlist:
logger.critical(
'socket activation did not return a readable socket with a '
'command.'
)
sys.exit(1)
logger.debug('accepting new connection')
conn_tmp, _addr = sck.accept()
conn = opendnssec.ODSSignerConn(conn_tmp)
logger.debug('accepted new connection %s', repr(conn))
# this implements cmdhandler_handle_cmd() logic
cmd = conn.read_cmd()
# ODS uses an ASCII protocol, the rest of the code expects str
if six.PY3:
cmd = cmd.decode('ascii')
logger.debug('received command "%s" from systemd socket', cmd)
return cmd, conn
def parse_command(cmd):
"""Parse command to (exit code, message, zone_name) tuple.
Exit code None means that execution should continue.
"""
if cmd == 'ipa-hsm-update':
return (
0,
'HSM synchronization finished, skipping zone synchronization.',
None,
cmd
)
elif cmd == 'ipa-full-update':
return (
None,
'Synchronization of all zones was finished.',
None,
cmd
)
elif cmd.startswith('ldap-cleanup '):
zone_name = cmd2ods_zone_name(cmd)
return (
None,
'Zone "%s" metadata will be removed from LDAP.\n' % zone_name,
zone_name,
'ldap-cleanup'
)
elif cmd.startswith('update '):
zone_name = cmd2ods_zone_name(cmd)
return (
None,
'Zone "%s" metadata will be updated in LDAP.\n' % zone_name,
zone_name,
'update'
)
else:
return (
0,
"Command '%s' is not supported by IPA; HSM synchronization was "
"finished and the command will be ignored." % cmd,
None,
None
)
def send_systemd_reply(conn, reply):
# Reply & close connection early.
# This is necessary to let Enforcer to unlock the ODS DB.
if six.PY3:
reply = reply.encode('ascii')
conn.send_reply_and_close(reply)
def cmd2ods_zone_name(cmd):
# ODS stores zone name without trailing period
zone_name = cmd.split(' ', 1)[1].strip()
if len(zone_name) > 1 and zone_name[-1] == '.':
zone_name = zone_name[:-1]
return zone_name
def sync_zone(ldap, dns_dn, zone_name):
"""synchronize metadata about zone keys for single DNS zone
Key material has to be synchronized elsewhere.
Keep in mind that keys could be shared among multiple zones!"""
logger.debug('%s: synchronizing zone "%s"', zone_name, zone_name)
try:
ods_keys = get_ods_keys(zone_name)
except ValueError as e:
logger.error(str(e))
return
ods_keys_id = set(ods_keys.keys())
ldap_zone = get_ldap_zone(ldap, dns_dn, zone_name)
zone_dn = ldap_zone.dn
keys_dn = get_ldap_keys_dn(zone_dn)
try:
ldap_keys = get_ldap_keys(ldap, zone_dn)
except ipalib.errors.NotFound:
# cn=keys container does not exist, create it
ldap_keys = []
ldap_keys_container = ldap.make_entry(keys_dn,
objectClass=['nsContainer'])
try:
ldap.add_entry(ldap_keys_container)
except ipalib.errors.DuplicateEntry:
# ldap.get_entries() does not distinguish non-existent base DN
# from empty result set so addition can fail because container
# itself exists already
pass
ldap_keys_dict = {}
for ldap_key in ldap_keys:
cn = ldap_key['cn'][0]
ldap_keys_dict[cn] = ldap_key
ldap_keys = ldap_keys_dict # shorthand
ldap_keys_id = set(ldap_keys.keys())
new_keys_id = ods_keys_id - ldap_keys_id
logger.info('%s: new key metadata from ODS: %s', zone_name, new_keys_id)
for key_id in new_keys_id:
cn = "cn=%s" % key_id
key_dn = DN(cn, keys_dn)
logger.debug('%s: adding key metadata "%s" to LDAP', zone_name, key_dn)
ldap_key = ldap.make_entry(key_dn,
objectClass=['idnsSecKey'],
**ods_keys[key_id])
ldap.add_entry(ldap_key)
deleted_keys_id = ldap_keys_id - ods_keys_id
logger.info('%s: deleted key metadata in LDAP: %s',
zone_name, deleted_keys_id)
for key_id in deleted_keys_id:
cn = "cn=%s" % key_id
key_dn = DN(cn, keys_dn)
logger.debug('%s: deleting key metadata "%s" from LDAP',
zone_name, key_dn)
ldap.delete_entry(key_dn)
update_keys_id = ldap_keys_id.intersection(ods_keys_id)
logger.info('%s: key metadata in LDAP & ODS: %s',
zone_name, update_keys_id)
for key_id in update_keys_id:
ldap_key = ldap_keys[key_id]
ods_key = ods_keys[key_id]
logger.debug('%s: updating key metadata "%s" in LDAP',
zone_name, ldap_key.dn)
ldap_key.update(ods_key)
try:
ldap.update_entry(ldap_key)
except ipalib.errors.EmptyModlist:
continue
def cleanup_ldap_zone(ldap, dns_dn, zone_name):
"""delete all key metadata about zone keys for single DNS zone
Key material has to be synchronized elsewhere.
Keep in mind that keys could be shared among multiple zones!"""
logger.debug('%s: cleaning up key metadata from zone "%s"',
zone_name, zone_name)
try:
ldap_zone = get_ldap_zone(ldap, dns_dn, zone_name)
ldap_keys = get_ldap_keys(ldap, ldap_zone.dn)
except ipalib.errors.NotFound as ex:
# zone or cn=keys container does not exist, we are done
logger.debug('%s: %s', zone_name, str(ex))
return
for ldap_key in ldap_keys:
logger.debug('%s: deleting key metadata "%s"', zone_name, ldap_key.dn)
ldap.delete_entry(ldap_key)
# this service is usually socket-activated
root_logger = logging.getLogger()
root_logger.addHandler(systemd.journal.JournalHandler())
root_logger.setLevel(level=logging.DEBUG)
if len(sys.argv) > 2:
print(__doc__)
sys.exit(1)
# program was likely invoked from console, log to it
elif len(sys.argv) == 2:
console = logging.StreamHandler()
root_logger.addHandler(console)
# IPA framework initialization
ipalib.api.bootstrap(context='dns', confdir=paths.ETC_IPA, in_server=True)
ipalib.api.finalize()
# Kerberos initialization
PRINCIPAL = str('%s/%s' % (DAEMONNAME, ipalib.api.env.host))
logger.debug('Kerberos principal: %s', PRINCIPAL)
ccache_name = paths.IPA_ODS_EXPORTER_CCACHE
try:
kinit_keytab(PRINCIPAL, paths.IPA_ODS_EXPORTER_KEYTAB, ccache_name,
attempts=5)
except GSSError as e:
logger.critical('Kerberos authentication failed: %s', e)
sys.exit(1)
os.environ['KRB5CCNAME'] = ccache_name
logger.debug('Got TGT')
# LDAP initialization
dns_dn = DN(ipalib.api.env.container_dns, ipalib.api.env.basedn)
ldap = ipaldap.LDAPClient(ipalib.api.env.ldap_uri)
logger.debug('Connecting to LDAP')
ldap.gssapi_bind()
logger.debug('Connected')
### DNSSEC master: key material upload & synchronization (but not deletion)
ldapkeydb = LdapKeyDB(ldap, DN(('cn', 'keys'),
('cn', 'sec'),
ipalib.api.env.container_dns,
ipalib.api.env.basedn))
localhsm = LocalHSM(paths.LIBSOFTHSM2_SO, SOFTHSM_DNSSEC_TOKEN_LABEL,
open(paths.DNSSEC_SOFTHSM_PIN).read())
ldap2master_replica_keys_sync(ldapkeydb, localhsm)
master2ldap_master_keys_sync(ldapkeydb, localhsm)
master2ldap_zone_keys_sync(ldapkeydb, localhsm)
### DNSSEC master: DNSSEC key metadata upload & synchronization & deletion
# command receive is delayed so the command will stay in socket queue until
# the problem with LDAP server or HSM is fixed
try:
cmd, conn = receive_systemd_command()
if len(sys.argv) != 1:
logger.critical('No additional parameters are accepted when '
'socket activation is used.')
sys.exit(1)
# Handle cases where somebody ran the program without systemd.
except KeyError as e:
if len(sys.argv) != 2:
print(__doc__)
print('ERROR: Exactly one parameter or socket activation is required.')
sys.exit(1)
conn = None
cmd = sys.argv[1]
exitcode, msg, zone_name, cmd = parse_command(cmd)
if exitcode:
logger.debug("parse_command returned exitcode: %d", exitcode)
if msg:
logger.debug("parse_command returned msg: %s", msg)
if zone_name:
logger.debug("parse_command returned zone_name: %s", zone_name)
if cmd:
logger.debug("parse_command returned cmd: %s", cmd)
if exitcode is not None:
if conn:
send_systemd_reply(conn, msg)
logger.info("%s", msg)
sys.exit(exitcode)
else:
logger.debug("%s", msg)
# Open DB directly and read key timestamps etc.
db = None
try:
# LOCK WARNING:
# ods-enforcerd is holding kasp.db.our_lock when processing all zones and
# the lock is unlocked only after all calls to ods-signer are finished,
# i.e. when ods-enforcerd receives reply from each ods-signer call.
#
# Consequently, ipa-ods-exporter (ods-signerd implementation) must not
# request kasp.db.our_lock to prevent deadlocks.
# SQLite transaction isolation should suffice.
# Beware: Reply can be sent back only after DB is unlocked and closed
# otherwise ods-enforcerd will fail.
db = opendnssec.ODSDBConnection()
if zone_name is not None:
# only one zone should be processed
if cmd == 'update':
sync_zone(ldap, dns_dn, zone_name)
elif cmd == 'ldap-cleanup':
cleanup_ldap_zone(ldap, dns_dn, zone_name)
else:
# process all zones
for zone_name in db.get_zones():
sync_zone(ldap, dns_dn, zone_name)
### DNSSEC master: DNSSEC key material purging
# references to old key material were removed above in sync_zone()
# so now we can purge old key material from LDAP
master2ldap_zone_keys_purge(ldapkeydb, localhsm)
except Exception as ex:
msg = "ipa-ods-exporter exception: %s" % traceback.format_exc(ex)
logger.exception("%s", ex)
raise ex
finally:
try:
if db:
db.close()
finally:
if conn:
send_systemd_reply(conn, msg)
logger.debug('Done')
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