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#!/usr/bin/python
#
# Copyright (C) 2014 FreeIPA Contributors see COPYING for license
#
import logging
from lxml import etree
import dns.name
import subprocess
from ipapython import ipa_log_manager, ipautil
# hack: zone object UUID is stored as path to imaginary zone file
ENTRYUUID_PREFIX = "/var/lib/ipa/dns/zone/entryUUID/"
ENTRYUUID_PREFIX_LEN = len(ENTRYUUID_PREFIX)
class ZoneListReader(object):
def __init__(self):
self.names = set() # dns.name
self.uuids = set() # UUID strings
self.mapping = dict() # {UUID: dns.name}
self.log = ipa_log_manager.log_mgr.get_logger(self)
def _add_zone(self, name, zid):
"""Add zone & UUID to internal structures.
Zone with given name and UUID must not exist."""
# detect duplicate zone names
name = dns.name.from_text(name)
assert name not in self.names, \
'duplicate name (%s, %s) vs. %s' % (name, zid, self.mapping)
# duplicate non-None zid is not allowed
assert not zid or zid not in self.uuids, \
'duplicate UUID (%s, %s) vs. %s' % (name, zid, self.mapping)
self.names.add(name)
self.uuids.add(zid)
self.mapping[zid] = name
def _del_zone(self, name, zid):
"""Remove zone & UUID from internal structures.
Zone with given name and UUID must exist.
"""
name = dns.name.from_text(name)
assert zid is not None
assert name in self.names, \
'name (%s, %s) does not exist in %s' % (name, zid, self.mapping)
assert zid in self.uuids, \
'UUID (%s, %s) does not exist in %s' % (name, zid, self.mapping)
assert zid in self.mapping and name == self.mapping[zid], \
'pair {%s: %s} does not exist in %s' % (zid, name, self.mapping)
self.names.remove(name)
self.uuids.remove(zid)
del self.mapping[zid]
class ODSZoneListReader(ZoneListReader):
"""One-shot parser for ODS zonelist.xml."""
def __init__(self, zonelist_text):
super(ODSZoneListReader, self).__init__()
xml = etree.fromstring(zonelist_text)
self._parse_zonelist(xml)
def _parse_zonelist(self, xml):
"""iterate over Zone elements with attribute 'name' and
add IPA zones to self.zones"""
for zone_xml in xml.xpath('/ZoneList/Zone[@name]'):
name, zid = self._parse_ipa_zone(zone_xml)
self._add_zone(name, zid)
def _parse_ipa_zone(self, zone_xml):
"""Extract zone name, input adapter and detect IPA zones.
IPA zones have contains Adapters/Input/Adapter element with
attribute type = "File" and with value prefixed with ENTRYUUID_PREFIX.
Returns:
tuple (zone name, ID)
"""
name = zone_xml.get('name')
in_adapters = zone_xml.xpath(
'Adapters/Input/Adapter[@type="File" '
'and starts-with(text(), "%s")]' % ENTRYUUID_PREFIX)
assert len(in_adapters) == 1, 'only IPA zones are supported: %s' \
% etree.tostring(zone_xml)
path = in_adapters[0].text
# strip prefix from path
zid = path[ENTRYUUID_PREFIX_LEN:]
return (name, zid)
class LDAPZoneListReader(ZoneListReader):
def __init__(self):
super(LDAPZoneListReader, self).__init__()
def process_ipa_zone(self, op, uuid, zone_ldap):
assert (op == 'add' or op == 'del'), 'unsupported op %s' % op
assert uuid is not None
assert 'idnsname' in zone_ldap, \
'LDAP zone UUID %s without idnsName' % uuid
assert len(zone_ldap['idnsname']) == 1, \
'LDAP zone UUID %s with len(idnsname) != 1' % uuid
if op == 'add':
self._add_zone(zone_ldap['idnsname'][0], uuid)
elif op == 'del':
self._del_zone(zone_ldap['idnsname'][0], uuid)
class ODSMgr(object):
"""OpenDNSSEC zone manager. It does LDAP->ODS synchronization.
Zones with idnsSecInlineSigning attribute = TRUE in LDAP are added
or deleted from ODS as necessary. ODS->LDAP key synchronization
has to be solved seperatelly.
"""
def __init__(self):
self.log = ipa_log_manager.log_mgr.get_logger(self)
self.zl_ldap = LDAPZoneListReader()
def ksmutil(self, params):
"""Call ods-ksmutil with given parameters and return stdout.
Raises CalledProcessError if returncode != 0.
"""
cmd = ['ods-ksmutil'] + params
return ipautil.run(cmd)[0]
def get_ods_zonelist(self):
stdout = self.ksmutil(['zonelist', 'export'])
reader = ODSZoneListReader(stdout)
return reader
def add_ods_zone(self, uuid, name):
zone_path = '%s%s' % (ENTRYUUID_PREFIX, uuid)
cmd = ['zone', 'add', '--zone', str(name), '--input', zone_path]
output = self.ksmutil(cmd)
self.log.info(output)
self.notify_enforcer()
def del_ods_zone(self, name):
# ods-ksmutil blows up if zone name has period at the end
name = name.relativize(dns.name.root)
# detect if name is root zone
if name == dns.name.empty:
name = dns.name.root
cmd = ['zone', 'delete', '--zone', str(name)]
output = self.ksmutil(cmd)
self.log.info(output)
self.notify_enforcer()
def notify_enforcer(self):
cmd = ['notify']
output = self.ksmutil(cmd)
self.log.info(output)
def ldap_event(self, op, uuid, attrs):
"""Record single LDAP event - zone addition or deletion.
Change is only recorded to memory.
self.sync() have to be called to synchronize change to ODS."""
assert op == 'add' or op == 'del'
self.zl_ldap.process_ipa_zone(op, uuid, attrs)
self.log.debug("LDAP zones: %s", self.zl_ldap.mapping)
def sync(self):
"""Synchronize list of zones in LDAP with ODS."""
zl_ods = self.get_ods_zonelist()
self.log.debug("ODS zones: %s", zl_ods.mapping)
removed = self.diff_zl(zl_ods, self.zl_ldap)
self.log.info("Zones removed from LDAP: %s", removed)
added = self.diff_zl(self.zl_ldap, zl_ods)
self.log.info("Zones added to LDAP: %s", added)
for (uuid, name) in removed:
self.del_ods_zone(name)
for (uuid, name) in added:
self.add_ods_zone(uuid, name)
def diff_zl(self, s1, s2):
"""Compute zones present in s1 but not present in s2.
Returns: List of (uuid, name) tuples with zones present only in s1."""
s1_extra = s1.uuids - s2.uuids
removed = [(uuid, name) for (uuid, name) in s1.mapping.items()
if uuid in s1_extra]
return removed
if __name__ == '__main__':
ipa_log_manager.standard_logging_setup(debug=True)
ods = ODSMgr()
reader = ods.get_ods_zonelist()
ipa_log_manager.root_logger.info('ODS zones: %s', reader.mapping)
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