mirror of
https://salsa.debian.org/freeipa-team/freeipa.git
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fe6819eb9d
OpenDNSSEC stores key metadata in local time zone but BIND needs timestamps in UTC. UTC will be stored in LDAP. https://fedorahosted.org/freeipa/ticket/4657 Reviewed-By: Martin Basti <mbasti@redhat.com>
554 lines
20 KiB
Python
Executable File
554 lines
20 KiB
Python
Executable File
#!/usr/bin/python2
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#
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# Copyright (C) 2014 FreeIPA Contributors see COPYING for license
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#
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"""
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This is FreeIPA's replacement for signerd from OpenDNSSEC suite version 1.4.x.
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This program uses the same socket and protocol as original signerd and should
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be activated via systemd socket activation using "ods-signer" command line
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utility.
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Alternativelly, it can be called directly and a command can be supplied as
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first command line argument.
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Purpose of this replacement is to upload keys generated by OpenDNSSEC to LDAP.
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"""
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from binascii import hexlify
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from datetime import datetime
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import dateutil.tz
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import dns.dnssec
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import fcntl
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import logging
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import os
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import subprocess
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import socket
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import sys
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import systemd.daemon
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import systemd.journal
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import sqlite3
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import time
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import ipalib
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from ipapython.dn import DN
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from ipapython.ipa_log_manager import root_logger, standard_logging_setup
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from ipapython import ipaldap
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from ipapython import ipautil
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from ipaserver.plugins.ldap2 import ldap2
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from ipaplatform.paths import paths
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from ipapython.dnssec.abshsm import sync_pkcs11_metadata, wrappingmech_name2id
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from ipapython.dnssec.ldapkeydb import LdapKeyDB
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from ipapython.dnssec.localhsm import LocalHSM
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import _ipap11helper
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DAEMONNAME = 'ipa-ods-exporter'
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PRINCIPAL = None # not initialized yet
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WORKDIR = os.path.join(paths.VAR_OPENDNSSEC_DIR ,'tmp')
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KEYTAB_FB = paths.IPA_ODS_EXPORTER_KEYTAB
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ODS_SE_MAXLINE = 1024 # from ODS common/config.h
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ODS_DB_LOCK_PATH = "%s%s" % (paths.OPENDNSSEC_KASP_DB, '.our_lock')
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# TODO: MECH_RSA_OAEP
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SECRETKEY_WRAPPING_MECH = 'rsaPkcs'
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PRIVKEY_WRAPPING_MECH = 'aesKeyWrapPad'
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# DNSKEY flag constants
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dnskey_flag_by_value = {
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0x0001: 'SEP',
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0x0080: 'REVOKE',
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0x0100: 'ZONE'
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}
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def dnskey_flags_to_text_set(flags):
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"""Convert a DNSKEY flags value to set texts
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@rtype: set([string])"""
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flags_set = set()
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mask = 0x1
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while mask <= 0x8000:
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if flags & mask:
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text = dnskey_flag_by_value.get(mask)
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if not text:
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text = hex(mask)
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flags_set.add(text)
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mask <<= 1
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return flags_set
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def datetime2ldap(dt):
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return dt.strftime(ipalib.constants.LDAP_GENERALIZED_TIME_FORMAT)
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def sql2datetime(sql_time):
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"""Convert SQL date format from local time zone into UTC."""
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localtz = dateutil.tz.tzlocal()
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localtime = datetime.strptime(sql_time, "%Y-%m-%d %H:%M:%S").replace(
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tzinfo=localtz)
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utctz = dateutil.tz.gettz('UTC')
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return localtime.astimezone(utctz)
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def sql2datetimes(row):
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row2key_map = {'generate': 'idnsSecKeyCreated',
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'publish': 'idnsSecKeyPublish',
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'active': 'idnsSecKeyActivate',
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'retire': 'idnsSecKeyInactive',
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'dead': 'idnsSecKeyDelete'}
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times = {}
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for column, key in row2key_map.iteritems():
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if row[column] is not None:
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times[key] = sql2datetime(row[column])
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return times
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def sql2ldap_algorithm(sql_algorithm):
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return {"idnsSecAlgorithm": dns.dnssec.algorithm_to_text(sql_algorithm)}
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def sql2ldap_flags(sql_flags):
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dns_flags = dnskey_flags_to_text_set(sql_flags)
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ldap_flags = {}
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for flag in dns_flags:
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attr = 'idnsSecKey%s' % flag
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ldap_flags[attr] = 'TRUE'
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return ldap_flags
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def sql2ldap_keyid(sql_keyid):
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assert len(sql_keyid) % 2 == 0
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assert len(sql_keyid) > 0
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# TODO: this is huge hack. BIND has some problems with % notation in URIs.
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# Workaround: OpenDNSSEC uses same value for ID also for label (but in hex).
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uri = "pkcs11:object=%s" % sql_keyid
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#uri += '%'.join(sql_keyid[i:i+2] for i in range(0, len(sql_keyid), 2))
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return {"idnsSecKeyRef": uri}
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class ods_db_lock(object):
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def __enter__(self):
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self.f = open(ODS_DB_LOCK_PATH, 'w')
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log.debug('waiting for lock %r', self.f)
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fcntl.lockf(self.f, fcntl.LOCK_EX)
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log.debug('acquired lock %r', self.f)
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def __exit__(self, *args):
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fcntl.lockf(self.f, fcntl.LOCK_UN)
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log.debug('released lock %r', self.f)
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self.f.close()
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def get_ldap_zone(ldap, dns_base, name):
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zone_names = ["%s." % name, name]
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# find zone object: name can optionally end with period
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ldap_zone = None
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for zone_name in zone_names:
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zone_base = DN("idnsname=%s" % zone_name, dns_base)
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try:
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ldap_zone = ldap.get_entry(dn=zone_base,
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attrs_list=["idnsname"])
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break
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except ipalib.errors.NotFound:
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continue
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assert ldap_zone is not None, 'DNS zone "%s" should exist in LDAP' % name
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return ldap_zone
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def get_ldap_keys_dn(zone_dn):
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"""Container DN"""
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return DN("cn=keys", zone_dn)
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def get_ldap_keys(ldap, zone_dn):
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"""Keys objects"""
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keys_dn = get_ldap_keys_dn(zone_dn)
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ldap_filter = ldap.make_filter_from_attr('objectClass', 'idnsSecKey')
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ldap_keys = ldap.get_entries(base_dn=keys_dn, filter=ldap_filter)
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return ldap_keys
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def get_ods_keys(zone_name):
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# get zone ID
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cur = db.execute("SELECT id FROM zones WHERE LOWER(name)=LOWER(?)",
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(zone_name,))
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rows = cur.fetchall()
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assert len(rows) == 1, "exactly one DNS zone should exist in ODS DB"
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zone_id = rows[0][0]
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# get all keys for given zone ID
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cur = db.execute("SELECT kp.HSMkey_id, kp.generate, kp.algorithm, dnsk.publish, dnsk.active, dnsk.retire, dnsk.dead, dnsk.keytype "
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"FROM keypairs AS kp JOIN dnsseckeys AS dnsk ON kp.id = dnsk.id "
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"WHERE dnsk.zone_id = ?", (zone_id,))
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keys = {}
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for row in cur:
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key_data = sql2datetimes(row)
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if 'idnsSecKeyDelete' in key_data \
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and key_data['idnsSecKeyDelete'] > datetime.now():
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continue # ignore deleted keys
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key_data.update(sql2ldap_flags(row['keytype']))
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assert key_data.get('idnsSecKeyZONE', None) == 'TRUE', \
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'unexpected key type 0x%x' % row['keytype']
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if key_data.get('idnsSecKeySEP', 'FALSE') == 'TRUE':
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key_type = 'KSK'
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else:
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key_type = 'ZSK'
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key_data.update(sql2ldap_algorithm(row['algorithm']))
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key_id = "%s-%s-%s" % (key_type,
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datetime2ldap(key_data['idnsSecKeyCreated']),
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row['HSMkey_id'])
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key_data.update(sql2ldap_keyid(row['HSMkey_id']))
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keys[key_id] = key_data
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log.debug("key %s metadata: %s", key_id, key_data)
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return keys
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def sync_set_metadata_2ldap(log, source_set, target_set):
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"""sync metadata from source key set to target key set in LDAP
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Keys not present in both sets are left intact."""
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log = log.getChild('sync_set_metadata_2ldap')
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matching_keys = set(source_set.keys()).intersection(set(target_set.keys()))
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log.info("keys in local HSM & LDAP: %s", hex_set(matching_keys))
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for key_id in matching_keys:
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sync_pkcs11_metadata(log, source_set[key_id], target_set[key_id])
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def ldap2master_replica_keys_sync(log, ldapkeydb, localhsm):
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"""LDAP=>master's local HSM replica key synchronization"""
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# import new replica keys from LDAP
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log = log.getChild('ldap2master_replica')
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log.debug("replica pub keys in LDAP: %s", hex_set(ldapkeydb.replica_pubkeys_wrap))
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log.debug("replica pub keys in SoftHSM: %s", hex_set(localhsm.replica_pubkeys_wrap))
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new_replica_keys = set(ldapkeydb.replica_pubkeys_wrap.keys()) \
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- set(localhsm.replica_pubkeys_wrap.keys())
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log.info("new replica keys in LDAP: %s", hex_set(new_replica_keys))
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for key_id in new_replica_keys:
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new_key_ldap = ldapkeydb.replica_pubkeys_wrap[key_id]
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log.error('label=%s, id=%s, data=%s',
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new_key_ldap['ipk11label'],
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hexlify(new_key_ldap['ipk11id']),
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hexlify(new_key_ldap['ipapublickey']))
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localhsm.import_public_key(new_key_ldap, new_key_ldap['ipapublickey'])
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# set CKA_WRAP = FALSE for all replica keys removed from LDAP
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removed_replica_keys = set(localhsm.replica_pubkeys_wrap.keys()) \
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- set(ldapkeydb.replica_pubkeys_wrap.keys())
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log.info("obsolete replica keys in local HSM: %s",
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hex_set(removed_replica_keys))
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for key_id in removed_replica_keys:
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localhsm.replica_pubkeys_wrap[key_id]['ipk11wrap'] = False
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# synchronize replica key attributes from LDAP to local HSM
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sync_set_metadata_2ldap(log, localhsm.replica_pubkeys_wrap,
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ldapkeydb.replica_pubkeys_wrap)
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def master2ldap_master_keys_sync(log, ldapkeydb, localhsm):
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## master key -> LDAP synchronization
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# export new master keys to LDAP
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new_master_keys = set(localhsm.master_keys.keys()) \
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- set(ldapkeydb.master_keys.keys())
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log.debug("master keys in local HSM: %s", hex_set(localhsm.master_keys.keys()))
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log.debug("master keys in LDAP HSM: %s", hex_set(ldapkeydb.master_keys.keys()))
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log.debug("new master keys in local HSM: %s", hex_set(new_master_keys))
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for mkey_id in new_master_keys:
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mkey = localhsm.master_keys[mkey_id]
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ldapkeydb.import_master_key(mkey)
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# re-fill cache with keys we just added
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ldapkeydb.flush()
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log.debug('master keys in LDAP after flush: %s', hex_set(ldapkeydb.master_keys))
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# synchronize master key metadata to LDAP
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for mkey_id, mkey_local in localhsm.master_keys.iteritems():
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log.debug('synchronizing master key metadata: 0x%s', hexlify(mkey_id))
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sync_pkcs11_metadata(log, mkey_local, ldapkeydb.master_keys[mkey_id])
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# re-wrap all master keys in LDAP with new replica keys (as necessary)
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enabled_replica_key_ids = set(localhsm.replica_pubkeys_wrap.keys())
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log.debug('enabled replica key ids: %s', hex_set(enabled_replica_key_ids))
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for mkey_id, mkey_ldap in ldapkeydb.master_keys.iteritems():
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log.debug('processing master key data: 0x%s', hexlify(mkey_id))
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# check that all active replicas have own copy of master key
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used_replica_keys = set()
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for wrapped_entry in mkey_ldap.wrapped_entries:
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matching_keys = localhsm.find_keys(
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uri=wrapped_entry.single_value['ipaWrappingKey'])
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for matching_key in matching_keys.itervalues():
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assert matching_key['ipk11label'].startswith(u'dnssec-replica:'), \
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'Wrapped key "%s" refers to PKCS#11 URI "%s" which is ' \
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'not a know DNSSEC replica key: label "%s" does not start ' \
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'with "dnssec-replica:" prefix' % (wrapped_entry.dn,
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wrapped_entry['ipaWrappingKey'],
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matching_key['ipk11label'])
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used_replica_keys.add(matching_key['ipk11id'])
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new_replica_keys = enabled_replica_key_ids - used_replica_keys
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log.debug('master key 0x%s is not wrapped with replica keys %s',
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hexlify(mkey_id), hex_set(new_replica_keys))
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# wrap master key with new replica keys
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mkey_local = localhsm.find_keys(id=mkey_id).popitem()[1]
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for replica_key_id in new_replica_keys:
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log.info('adding master key 0x%s wrapped with replica key 0x%s' % (
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hexlify(mkey_id), hexlify(replica_key_id)))
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replica_key = localhsm.replica_pubkeys_wrap[replica_key_id]
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keydata = localhsm.p11.export_wrapped_key(mkey_local.handle,
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replica_key.handle, _ipap11helper.MECH_RSA_PKCS)
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mkey_ldap.add_wrapped_data(keydata, SECRETKEY_WRAPPING_MECH,
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replica_key_id)
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ldapkeydb.flush()
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def master2ldap_zone_keys_sync(log, ldapkeydb, localhsm):
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# synchroniza zone keys
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log = log.getChild('master2ldap_zone_keys')
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keypairs_ldap = ldapkeydb.zone_keypairs
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log.debug("zone keys in LDAP: %s", hex_set(keypairs_ldap))
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pubkeys_local = localhsm.zone_pubkeys
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privkeys_local = localhsm.zone_privkeys
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log.debug("zone keys in local HSM: %s", hex_set(privkeys_local))
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assert set(pubkeys_local) == set(privkeys_local), \
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"IDs of private and public keys for DNS zones in local HSM does " \
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"not match to key pairs: %s vs. %s" % \
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(hex_set(pubkeys_local), hex_set(privkeys_local))
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new_keys = set(pubkeys_local) - set(keypairs_ldap)
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log.debug("new zone keys in local HSM: %s", hex_set(new_keys))
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mkey = localhsm.active_master_key
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# wrap each new zone key pair with selected master key
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for zkey_id in new_keys:
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pubkey = pubkeys_local[zkey_id]
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pubkey_data = localhsm.p11.export_public_key(pubkey.handle)
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privkey = privkeys_local[zkey_id]
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privkey_data = localhsm.p11.export_wrapped_key(privkey.handle,
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wrapping_key=mkey.handle,
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wrapping_mech=wrappingmech_name2id[PRIVKEY_WRAPPING_MECH])
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ldapkeydb.import_zone_key(pubkey, pubkey_data, privkey, privkey_data,
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PRIVKEY_WRAPPING_MECH, mkey['ipk11id'])
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sync_set_metadata_2ldap(log, pubkeys_local, keypairs_ldap)
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sync_set_metadata_2ldap(log, privkeys_local, keypairs_ldap)
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ldapkeydb.flush()
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def hex_set(s):
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out = set()
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for i in s:
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out.add("0x%s" % hexlify(i))
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return out
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def receive_systemd_command(log):
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fds = systemd.daemon.listen_fds()
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if len(fds) != 1:
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raise KeyError('Exactly one socket is expected.')
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sck = socket.fromfd(fds[0], socket.AF_UNIX, socket.SOCK_STREAM)
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conn, addr = sck.accept()
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log.debug('accepted new connection %s', repr(conn))
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# this implements cmdhandler_handle_cmd() logic
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cmd = conn.recv(ODS_SE_MAXLINE).strip()
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log.debug('received command "%s" from systemd socket', cmd)
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return (cmd, conn)
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def parse_command(cmd):
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"""Parse command to (exit code, message, zone_name) tuple.
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Exit code None means that execution should continue.
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"""
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if cmd == 'ipa-hsm-update':
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return (0,
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'HSM synchronization finished, exiting.',
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None)
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elif cmd == 'ipa-full-update':
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return (None,
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'Synchronization of all zones requested.',
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None)
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elif not cmd.startswith('update '):
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return (0,
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'Command "%s" is not supported by IPA; '
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'HSM synchronization was finished and the command '
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'will be ignored.' % cmd,
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None)
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else:
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zone_name = cmd2ods_zone_name(cmd)
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return (None,
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'Update request for zone "%s" queued.\n' % zone_name,
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zone_name)
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def send_systemd_reply(conn, reply):
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# Reply & close connection early.
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# This is necessary to let Enforcer to unlock the ODS DB.
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conn.send(reply + '\n')
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conn.shutdown(socket.SHUT_RDWR)
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conn.close()
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def cmd2ods_zone_name(cmd):
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# ODS stores zone name without trailing period
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zone_name = cmd[7:].strip()
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if len(zone_name) > 1 and zone_name[-1] == '.':
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zone_name = zone_name[:-1]
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return zone_name
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def sync_zone(log, ldap, dns_dn, zone_name):
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log.debug('synchronizing zone "%s"', zone_name)
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ods_keys = get_ods_keys(zone_name)
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ods_keys_id = set(ods_keys.keys())
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ldap_zone = get_ldap_zone(ldap, dns_dn, zone_name)
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zone_dn = ldap_zone.dn
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keys_dn = get_ldap_keys_dn(zone_dn)
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try:
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ldap_keys = get_ldap_keys(ldap, zone_dn)
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except ipalib.errors.NotFound:
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# cn=keys container does not exist, create it
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ldap_keys = []
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ldap_keys_container = ldap.make_entry(keys_dn,
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objectClass=['nsContainer'])
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try:
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ldap.add_entry(ldap_keys_container)
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except ipalib.errors.DuplicateEntry:
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# ldap.get_entries() does not distinguish non-existent base DN
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# from empty result set so addition can fail because container
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# itself exists already
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pass
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ldap_keys_dict = {}
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for ldap_key in ldap_keys:
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|
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
|
|
log.info('new keys from ODS: %s', new_keys_id)
|
|
for key_id in new_keys_id:
|
|
cn = "cn=%s" % key_id
|
|
key_dn = DN(cn, keys_dn)
|
|
log.debug('adding key "%s" to LDAP', 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
|
|
log.info('deleted keys in LDAP: %s', deleted_keys_id)
|
|
for key_id in deleted_keys_id:
|
|
cn = "cn=%s" % key_id
|
|
key_dn = DN(cn, keys_dn)
|
|
log.debug('deleting key "%s" from LDAP', key_dn)
|
|
ldap.delete_entry(key_dn)
|
|
|
|
update_keys_id = ldap_keys_id.intersection(ods_keys_id)
|
|
log.info('keys in LDAP & ODS: %s', update_keys_id)
|
|
for key_id in update_keys_id:
|
|
ldap_key = ldap_keys[key_id]
|
|
ods_key = ods_keys[key_id]
|
|
log.debug('updating key "%s" in LDAP', ldap_key.dn)
|
|
ldap_key.update(ods_key)
|
|
try:
|
|
ldap.update_entry(ldap_key)
|
|
except ipalib.errors.EmptyModlist:
|
|
continue
|
|
|
|
|
|
log = logging.getLogger('root')
|
|
# this service is usually socket-activated
|
|
log.addHandler(systemd.journal.JournalHandler())
|
|
log.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()
|
|
log.addHandler(console)
|
|
|
|
# IPA framework initialization
|
|
ipalib.api.bootstrap(in_server=True, log=None) # no logging to file
|
|
ipalib.api.finalize()
|
|
|
|
# Kerberos initialization
|
|
PRINCIPAL = str('%s/%s' % (DAEMONNAME, ipalib.api.env.host))
|
|
log.debug('Kerberos principal: %s', PRINCIPAL)
|
|
ccache_name = os.path.join(WORKDIR, 'ipa-ods-exporter.ccache')
|
|
ipautil.kinit_keytab(PRINCIPAL, paths.IPA_ODS_EXPORTER_KEYTAB, ccache_name)
|
|
os.environ['KRB5CCNAME'] = ccache_name
|
|
log.debug('Got TGT')
|
|
|
|
# LDAP initialization
|
|
dns_dn = DN(ipalib.api.env.container_dns, ipalib.api.env.basedn)
|
|
ldap = ipalib.api.Backend[ldap2]
|
|
# fixme
|
|
log.debug('Connecting to LDAP')
|
|
ldap.connect(ccache=ccache_name)
|
|
log.debug('Connected')
|
|
|
|
|
|
### DNSSEC master: key synchronization
|
|
ldapkeydb = LdapKeyDB(log, ldap, DN(('cn', 'keys'), ('cn', 'sec'),
|
|
ipalib.api.env.container_dns,
|
|
ipalib.api.env.basedn))
|
|
localhsm = LocalHSM(paths.LIBSOFTHSM2_SO, 0,
|
|
open(paths.DNSSEC_SOFTHSM_PIN).read())
|
|
|
|
ldap2master_replica_keys_sync(log, ldapkeydb, localhsm)
|
|
master2ldap_master_keys_sync(log, ldapkeydb, localhsm)
|
|
master2ldap_zone_keys_sync(log, ldapkeydb, localhsm)
|
|
|
|
|
|
### DNSSEC master: DNSSEC key metadata upload
|
|
# 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(log)
|
|
if len(sys.argv) != 1:
|
|
log.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 = parse_command(cmd)
|
|
|
|
if conn:
|
|
send_systemd_reply(conn, msg)
|
|
if exitcode is not None:
|
|
log.info(msg)
|
|
sys.exit(exitcode)
|
|
else:
|
|
log.debug(msg)
|
|
|
|
# Open DB directly and read key timestamps etc.
|
|
with ods_db_lock():
|
|
db = sqlite3.connect(paths.OPENDNSSEC_KASP_DB,
|
|
isolation_level="EXCLUSIVE")
|
|
db.row_factory = sqlite3.Row
|
|
db.execute('BEGIN')
|
|
|
|
if zone_name is not None:
|
|
# only one zone should be processed
|
|
sync_zone(log, ldap, dns_dn, zone_name)
|
|
else:
|
|
# process all zones
|
|
for zone_row in db.execute("SELECT name FROM zones"):
|
|
sync_zone(log, ldap, dns_dn, zone_row['name'])
|
|
|
|
log.debug('Done')
|