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https://salsa.debian.org/freeipa-team/freeipa.git
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0b797da560
ldap2 internally does LDAP search to find out what LDAP search limits should be used (!). The problem is that this internal search has hardcoded limits and throws LimitExceeded exception when DS is too slow. DNSSEC daemons do not need any abstractions from ldap2 so we are going to use ipaldap directly. This will avoid the unnecessary search and associated risks. https://fedorahosted.org/freeipa/ticket/5342 Reviewed-By: Martin Basti <mbasti@redhat.com>
175 lines
6.5 KiB
Python
Executable File
175 lines
6.5 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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Download keys from LDAP to local HSM.
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This program should be run only on replicas, not on DNSSEC masters.
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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 dns.dnssec
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import fcntl
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from gssapi.exceptions import GSSError
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import logging
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import os
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from pprint import pprint
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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 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 ipaplatform.paths import paths
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from ipapython.dnssec.abshsm import sync_pkcs11_metadata, ldap2p11helper_api_params, 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-dnskeysyncd'
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PRINCIPAL = None # not initialized yet
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WORKDIR = '/tmp'
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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 update_metadata_set(log, source_set, target_set):
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"""sync metadata from source key set to target key set
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Keys not present in both sets are left intact."""
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log = log.getChild('sync_metadata')
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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 find_unwrapping_key(log, localhsm, wrapping_key_uri):
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wrap_keys = localhsm.find_keys(uri=wrapping_key_uri)
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# find usable unwrapping key with matching ID
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for key_id, key in wrap_keys.items():
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unwrap_keys = localhsm.find_keys(id=key_id, cka_unwrap=True)
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if len(unwrap_keys) > 0:
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return unwrap_keys.popitem()[1]
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def ldap2replica_master_keys_sync(log, ldapkeydb, localhsm):
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## LDAP -> replica master key synchronization
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# import new master keys from LDAP
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new_keys = set(ldapkeydb.master_keys.keys()) \
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- set(localhsm.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 LDAP HSM: %s", hex_set(new_keys))
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for mkey_id in new_keys:
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mkey_ldap = ldapkeydb.master_keys[mkey_id]
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assert mkey_ldap.wrapped_entries, "Master key 0x%s in LDAP is missing key material referenced by ipaSecretKeyRefObject attribute" % hexlify(mkey_id)
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for wrapped_ldap in mkey_ldap.wrapped_entries:
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unwrapping_key = find_unwrapping_key(log, localhsm,
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wrapped_ldap.single_value['ipaWrappingKey'])
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if unwrapping_key:
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break
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# TODO: Could it happen in normal cases?
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assert unwrapping_key is not None, "Local HSM does not contain suitable unwrapping key for master key 0x%s" % hexlify(mkey_id)
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params = ldap2p11helper_api_params(mkey_ldap)
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params['data'] = wrapped_ldap.single_value['ipaSecretKey']
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params['unwrapping_key'] = unwrapping_key.handle
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params['wrapping_mech'] = wrappingmech_name2id[wrapped_ldap.single_value['ipaWrappingMech']]
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log.debug('Importing new master key: 0x%s %s', hexlify(mkey_id), params)
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localhsm.p11.import_wrapped_secret_key(**params)
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# synchronize metadata about master keys in LDAP
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update_metadata_set(log, ldapkeydb.master_keys, localhsm.master_keys)
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def ldap2replica_zone_keys_sync(log, ldapkeydb, localhsm):
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## LDAP -> replica zone key synchronization
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# import new zone keys from LDAP
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new_keys = set(ldapkeydb.zone_keypairs.keys()) \
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- set(localhsm.zone_privkeys.keys())
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log.debug("zone keys in local HSM: %s", hex_set(localhsm.master_keys.keys()))
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log.debug("zone keys in LDAP HSM: %s", hex_set(ldapkeydb.master_keys.keys()))
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log.debug("new zone keys in LDAP HSM: %s", hex_set(new_keys))
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for zkey_id in new_keys:
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zkey_ldap = ldapkeydb.zone_keypairs[zkey_id]
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log.debug('Looking for unwrapping key "%s" for zone key 0x%s',
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zkey_ldap['ipaWrappingKey'], hexlify(zkey_id))
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unwrapping_key = find_unwrapping_key(log, localhsm,
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zkey_ldap['ipaWrappingKey'])
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assert unwrapping_key is not None, \
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"Local HSM does not contain suitable unwrapping key for ' \
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'zone key 0x%s" % hexlify(zkey_id)
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log.debug('Importing zone key pair 0x%s', hexlify(zkey_id))
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localhsm.import_private_key(zkey_ldap, zkey_ldap['ipaPrivateKey'],
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unwrapping_key)
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localhsm.import_public_key(zkey_ldap, zkey_ldap['ipaPublicKey'])
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# synchronize metadata about zone keys in LDAP & local HSM
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update_metadata_set(log, ldapkeydb.master_keys, localhsm.master_keys)
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# delete keys removed from LDAP
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deleted_keys = set(localhsm.zone_privkeys.keys()) \
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- set(ldapkeydb.zone_keypairs.keys())
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for zkey_id in deleted_keys:
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localhsm.p11.delete_key(localhsm.zone_pubkeys[zkey_id].handle)
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localhsm.p11.delete_key(localhsm.zone_privkeys[zkey_id].handle)
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# IPA framework initialization
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ipalib.api.bootstrap(in_server=True, log=None) # no logging to file
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ipalib.api.finalize()
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standard_logging_setup(verbose=True, debug = True) # debug=ipalib.api.env.debug)
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log = root_logger
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log.setLevel(level=logging.DEBUG)
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# Kerberos initialization
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PRINCIPAL = str('%s/%s' % (DAEMONNAME, ipalib.api.env.host))
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log.debug('Kerberos principal: %s', PRINCIPAL)
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ccache_filename = os.path.join(WORKDIR, 'ipa-dnskeysync-replica.ccache')
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try:
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ipautil.kinit_keytab(PRINCIPAL, paths.IPA_DNSKEYSYNCD_KEYTAB,
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ccache_filename, attempts=5)
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except GSSError as e:
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log.critical('Kerberos authentication failed: %s', e)
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sys.exit(1)
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os.environ['KRB5CCNAME'] = ccache_filename
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log.debug('Got TGT')
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# LDAP initialization
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ldap = ipaldap.LDAPClient(ipalib.api.env.ldap_uri)
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log.debug('Connecting to LDAP')
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ldap.gssapi_bind()
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log.debug('Connected')
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### DNSSEC master: key synchronization
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ldapkeydb = LdapKeyDB(log, ldap,
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DN(('cn', 'keys'), ('cn', 'sec'), ipalib.api.env.container_dns,
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ipalib.api.env.basedn))
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# TODO: slot number could be configurable
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localhsm = LocalHSM(paths.LIBSOFTHSM2_SO, 0,
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open(paths.DNSSEC_SOFTHSM_PIN).read())
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ldap2replica_master_keys_sync(log, ldapkeydb, localhsm)
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ldap2replica_zone_keys_sync(log, ldapkeydb, localhsm)
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sys.exit(0)
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