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freeipa/ipapython/ipaldap.py
Jan Cholasta 5d489ac560 pylint_plugins: add forbidden import checker 
Add new pylint AST checker plugin which implements a check for imports
forbidden in IPA. Which imports are forbidden is configurable in pylintrc.

Provide default forbidden import configuration and disable the check for
existing forbidden imports in our code base.

Reviewed-By: Martin Basti <mbasti@redhat.com>
2017-03-10 13:04:59 +01:00

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# Authors: Rich Megginson <richm@redhat.com>
# Rob Crittenden <rcritten@redhat.com>
# John Dennis <jdennis@redhat.com>
#
# Copyright (C) 2007 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import binascii
import time
import datetime
from decimal import Decimal
from copy import deepcopy
import contextlib
import collections
import os
import pwd
# pylint: disable=import-error
from six.moves.urllib.parse import urlparse
# pylint: enable=import-error
import ldap
import ldap.sasl
import ldap.filter
from ldap.controls import SimplePagedResultsControl
import six
# pylint: disable=ipa-forbidden-import
from ipalib import errors, _
from ipalib.constants import LDAP_GENERALIZED_TIME_FORMAT
# pylint: enable=ipa-forbidden-import
from ipapython.ipautil import format_netloc, CIDict
from ipapython.ipa_log_manager import log_mgr
from ipapython.dn import DN
from ipapython.dnsutil import DNSName
from ipapython.kerberos import Principal
if six.PY3:
unicode = str
# Global variable to define SASL auth
SASL_GSSAPI = ldap.sasl.sasl({}, 'GSSAPI')
SASL_GSS_SPNEGO = ldap.sasl.sasl({}, 'GSS-SPNEGO')
_debug_log_ldap = False
_missing = object()
# Autobind modes
AUTOBIND_AUTO = 1
AUTOBIND_ENABLED = 2
AUTOBIND_DISABLED = 3
TRUNCATED_SIZE_LIMIT = object()
TRUNCATED_TIME_LIMIT = object()
TRUNCATED_ADMIN_LIMIT = object()
DIRMAN_DN = DN(('cn', 'directory manager'))
class _ServerSchema(object):
'''
Properties of a schema retrieved from an LDAP server.
'''
def __init__(self, server, schema):
self.server = server
self.schema = schema
self.retrieve_timestamp = time.time()
class SchemaCache(object):
'''
Cache the schema's from individual LDAP servers.
'''
def __init__(self):
self.log = log_mgr.get_logger(self)
self.servers = {}
def get_schema(self, url, conn, force_update=False):
'''
Return schema belonging to a specific LDAP server.
For performance reasons the schema is retrieved once and
cached unless force_update is True. force_update flushes the
existing schema for the server from the cache and reacquires
it.
'''
if force_update:
self.flush(url)
server_schema = self.servers.get(url)
if server_schema is None:
schema = self._retrieve_schema_from_server(url, conn)
server_schema = _ServerSchema(url, schema)
self.servers[url] = server_schema
return server_schema.schema
def flush(self, url):
self.log.debug('flushing %s from SchemaCache', url)
try:
del self.servers[url]
except KeyError:
pass
def _retrieve_schema_from_server(self, url, conn):
"""
Retrieve the LDAP schema from the provided url and determine if
User-Private Groups (upg) are configured.
Bind using kerberos credentials. If in the context of the
in-tree "lite" server then use the current ccache. If in the context of
Apache then create a new ccache and bind using the Apache HTTP service
principal.
If a connection is provided then it the credentials bound to it are
used. The connection is not closed when the request is done.
"""
assert conn is not None
self.log.debug(
'retrieving schema for SchemaCache url=%s conn=%s', url, conn)
try:
try:
schema_entry = conn.search_s('cn=schema', ldap.SCOPE_BASE,
attrlist=['attributetypes', 'objectclasses'])[0]
except ldap.NO_SUCH_OBJECT:
# try different location for schema
# openldap has schema located in cn=subschema
self.log.debug('cn=schema not found, fallback to cn=subschema')
schema_entry = conn.search_s('cn=subschema', ldap.SCOPE_BASE,
attrlist=['attributetypes', 'objectclasses'])[0]
except ldap.SERVER_DOWN:
raise errors.NetworkError(uri=url,
error=u'LDAP Server Down, unable to retrieve LDAP schema')
except ldap.LDAPError as e:
desc = e.args[0]['desc'].strip()
info = e.args[0].get('info', '').strip()
raise errors.DatabaseError(desc = u'uri=%s' % url,
info = u'Unable to retrieve LDAP schema: %s: %s' % (desc, info))
except IndexError:
# no 'cn=schema' entry in LDAP? some servers use 'cn=subschema'
# TODO: DS uses 'cn=schema', support for other server?
# raise a more appropriate exception
raise
return ldap.schema.SubSchema(schema_entry[1])
schema_cache = SchemaCache()
class LDAPEntry(collections.MutableMapping):
__slots__ = ('_conn', '_dn', '_names', '_nice', '_raw', '_sync',
'_not_list', '_orig', '_raw_view', '_single_value_view')
def __init__(self, _conn, _dn=None, _obj=None, **kwargs):
"""
LDAPEntry constructor.
Takes 1 to 3 positional arguments and an arbitrary number of keyword
arguments. The 3 forms of positional arguments are:
* LDAPEntry(entry) - create a shallow copy of an existing LDAPEntry.
* LDAPEntry(dn, entry) - create a shallow copy of an existing
LDAPEntry with a different DN.
* LDAPEntry(conn, dn, mapping) - create a new LDAPEntry using the
specified LDAPClient and DN and optionally initialize
attributes from the specified mapping object.
Keyword arguments can be used to override values of specific attributes.
"""
super(LDAPEntry, self).__init__() # pylint: disable=no-member
if isinstance(_conn, LDAPEntry):
assert _dn is None
_dn = _conn
_conn = _conn._conn
assert isinstance(_conn, LDAPClient)
if isinstance(_dn, LDAPEntry):
assert _obj is None
_obj = _dn
_dn = _dn._dn
assert isinstance(_dn, DN)
if _obj is None:
_obj = {}
self._conn = _conn
self._dn = _dn
self._names = CIDict()
self._nice = {}
self._raw = {}
self._sync = {}
self._not_list = set()
self._orig = {}
self._raw_view = None
self._single_value_view = None
if isinstance(_obj, LDAPEntry):
#pylint: disable=E1103
self._not_list = set(_obj._not_list)
self._orig = dict(_obj._orig)
if _obj.conn is _conn:
self._names = CIDict(_obj._names)
self._nice = dict(_obj._nice)
self._raw = dict(_obj._raw)
self._sync = dict(_obj._sync)
else:
self.raw.update(_obj.raw)
_obj = {}
self.update(_obj, **kwargs)
@property
def conn(self):
return self._conn
@property
def dn(self):
return self._dn
@dn.setter
def dn(self, value):
assert isinstance(value, DN)
self._dn = value
@property
def raw(self):
if self._raw_view is None:
self._raw_view = RawLDAPEntryView(self)
return self._raw_view
@property
def single_value(self):
if self._single_value_view is None:
self._single_value_view = SingleValueLDAPEntryView(self)
return self._single_value_view
def __repr__(self):
data = dict(self._raw)
data.update((k, v) for k, v in self._nice.items() if v is not None)
return '%s(%r, %r)' % (type(self).__name__, self._dn, data)
def copy(self):
return LDAPEntry(self)
def _sync_attr(self, name):
nice = self._nice[name]
assert isinstance(nice, list)
raw = self._raw[name]
assert isinstance(raw, list)
nice_sync, raw_sync = self._sync.setdefault(name, ([], []))
if nice == nice_sync and raw == raw_sync:
return
nice_adds = set(nice) - set(nice_sync)
nice_dels = set(nice_sync) - set(nice)
raw_adds = set(raw) - set(raw_sync)
raw_dels = set(raw_sync) - set(raw)
for value in nice_dels:
value = self._conn.encode(value)
if value in raw_adds:
continue
raw.remove(value)
for value in raw_dels:
try:
value = self._conn.decode(value, name)
except ValueError as e:
raise ValueError("{error} in LDAP entry '{dn}'".format(
error=e, dn=self._dn))
if value in nice_adds:
continue
nice.remove(value)
for value in sorted(nice_adds, key=nice.index):
value = self._conn.encode(value)
if value in raw_dels:
continue
raw.append(value)
for value in sorted(raw_adds, key=raw.index):
try:
value = self._conn.decode(value, name)
except ValueError as e:
raise ValueError("{error} in LDAP entry '{dn}'".format(
error=e, dn=self._dn))
if value in nice_dels:
continue
nice.append(value)
self._sync[name] = (deepcopy(nice), deepcopy(raw))
if len(nice) > 1:
self._not_list.discard(name)
def _attr_name(self, name):
if not isinstance(name, six.string_types):
raise TypeError(
"attribute name must be unicode or str, got %s object %r" % (
name.__class__.__name__, name))
if isinstance(name, bytes):
name = name.decode('utf-8')
return name
def _add_attr_name(self, name):
if name in self._names:
return self._names[name]
if self._conn.schema is not None:
if six.PY2:
encoded_name = name.encode('utf-8')
else:
encoded_name = name
attrtype = self._conn.schema.get_obj(
ldap.schema.AttributeType, encoded_name)
if attrtype is not None:
for altname in attrtype.names:
if six.PY2:
altname = altname.decode('utf-8')
self._names[altname] = name
self._names[name] = name
for oldname in list(self._orig):
if self._names.get(oldname) == name:
self._orig[name] = self._orig.pop(oldname)
break
return name
def _set_nice(self, name, value):
name = self._attr_name(name)
name = self._add_attr_name(name)
if not isinstance(value, list):
if value is None:
value = []
else:
value = [value]
self._not_list.add(name)
else:
self._not_list.discard(name)
if self._nice.get(name) is not value:
self._nice[name] = value
self._raw[name] = None
self._sync.pop(name, None)
if self._raw[name] is not None:
self._sync_attr(name)
def _set_raw(self, name, value):
name = self._attr_name(name)
if not isinstance(value, list):
raise TypeError("%s value must be list, got %s object %r" % (
name, value.__class__.__name__, value))
for (i, item) in enumerate(value):
if not isinstance(item, bytes):
raise TypeError(
"%s[%d] value must be bytes, got %s object %r" % (
name, i, item.__class__.__name__, item)
)
name = self._add_attr_name(name)
if self._raw.get(name) is not value:
self._raw[name] = value
self._nice[name] = None
self._sync.pop(name, None)
if self._nice[name] is not None:
self._sync_attr(name)
def __setitem__(self, name, value):
self._set_nice(name, value)
def _get_attr_name(self, name):
name = self._attr_name(name)
name = self._names[name]
return name
def _get_nice(self, name):
name = self._get_attr_name(name)
value = self._nice[name]
if value is None:
value = self._nice[name] = []
assert isinstance(value, list)
if self._raw[name] is not None:
self._sync_attr(name)
if name in self._not_list:
assert len(value) <= 1
if value:
value = value[0]
else:
value = None
return value
def _get_raw(self, name):
name = self._get_attr_name(name)
value = self._raw[name]
if value is None:
value = self._raw[name] = []
assert isinstance(value, list)
if self._nice[name] is not None:
self._sync_attr(name)
return value
def __getitem__(self, name):
return self._get_nice(name)
def __delitem__(self, name):
name = self._get_attr_name(name)
for (altname, keyname) in list(self._names.items()):
if keyname == name:
del self._names[altname]
del self._nice[name]
del self._raw[name]
self._sync.pop(name, None)
self._not_list.discard(name)
def clear(self):
self._names.clear()
self._nice.clear()
self._raw.clear()
self._sync.clear()
self._not_list.clear()
def __len__(self):
return len(self._nice)
def __contains__(self, name):
return name in self._names
def has_key(self, name):
return name in self
def __eq__(self, other):
if not isinstance(other, LDAPEntry):
return NotImplemented
return other is self
def __ne__(self, other):
if not isinstance(other, LDAPEntry):
return NotImplemented
return other is not self
def reset_modlist(self, other=None):
if other is None:
other = self
assert isinstance(other, LDAPEntry)
self._orig = deepcopy(dict(other.raw))
def generate_modlist(self):
modlist = []
names = set(self)
names.update(self._orig)
for name in names:
new = self.raw.get(name, [])
old = self._orig.get(name, [])
if old and not new:
modlist.append((ldap.MOD_DELETE, name, None))
continue
if not old and new:
modlist.append((ldap.MOD_REPLACE, name, new))
continue
# We used to convert to sets and use difference to calculate
# the changes but this did not preserve order which is important
# particularly for schema
adds = [value for value in new if value not in old]
dels = [value for value in old if value not in new]
if adds and self.conn.get_attribute_single_value(name):
if len(adds) > 1:
raise errors.OnlyOneValueAllowed(attr=name)
modlist.append((ldap.MOD_REPLACE, name, adds))
else:
if adds:
modlist.append((ldap.MOD_ADD, name, adds))
if dels:
modlist.append((ldap.MOD_DELETE, name, dels))
# Usually the modlist order does not matter.
# However, for schema updates, we want 'attributetypes' before
# 'objectclasses'.
# A simple sort will ensure this.
modlist.sort(key=lambda m: m[1].lower() != 'attributetypes')
return modlist
def __iter__(self):
return iter(self._nice)
class LDAPEntryView(collections.MutableMapping):
__slots__ = ('_entry',)
def __init__(self, entry):
assert isinstance(entry, LDAPEntry)
self._entry = entry
def __delitem__(self, name):
del self._entry[name]
def clear(self):
self._entry.clear()
def __iter__(self):
return iter(self._entry)
def __len__(self):
return len(self._entry)
def __contains__(self, name):
return name in self._entry
def has_key(self, name):
return name in self
class RawLDAPEntryView(LDAPEntryView):
def __getitem__(self, name):
return self._entry._get_raw(name)
def __setitem__(self, name, value):
self._entry._set_raw(name, value)
class SingleValueLDAPEntryView(LDAPEntryView):
def __getitem__(self, name):
value = self._entry[name]
if not isinstance(value, list):
# FIXME: remove when we enforce lists
return value
elif not value:
return None
elif len(value) == 1:
return value[0]
else:
raise ValueError(
'%s has %s values, one expected' % (name, len(value)))
def __setitem__(self, name, value):
if value is None:
self._entry[name] = None
else:
self._entry[name] = [value]
class LDAPClient(object):
"""LDAP backend class
This class abstracts a LDAP connection, providing methods that work with
LADPEntries.
The purpose of this class is to provide a boundary between IPA and
python-ldap. In IPA we use IPA defined types because they are
richer and are designed to meet our needs. We also require that we
consistently use those types without exception. On the other hand
python-ldap uses different types. The goal is to be able to have
IPA code call python-ldap methods using the types native to
IPA. This class accomplishes that goal by exposing python-ldap
methods which take IPA types, convert them to python-ldap types,
call python-ldap, and then convert the results returned by
python-ldap into IPA types.
"""
# rules for generating filters from entries
MATCH_ANY = '|' # (|(filter1)(filter2))
MATCH_ALL = '&' # (&(filter1)(filter2))
MATCH_NONE = '!' # (!(filter1)(filter2))
# search scope for find_entries()
SCOPE_BASE = ldap.SCOPE_BASE
SCOPE_ONELEVEL = ldap.SCOPE_ONELEVEL
SCOPE_SUBTREE = ldap.SCOPE_SUBTREE
_SYNTAX_MAPPING = {
'1.3.6.1.4.1.1466.115.121.1.1' : bytes, # ACI item
'1.3.6.1.4.1.1466.115.121.1.4' : bytes, # Audio
'1.3.6.1.4.1.1466.115.121.1.5' : bytes, # Binary
'1.3.6.1.4.1.1466.115.121.1.8' : bytes, # Certificate
'1.3.6.1.4.1.1466.115.121.1.9' : bytes, # Certificate List
'1.3.6.1.4.1.1466.115.121.1.10' : bytes, # Certificate Pair
'1.3.6.1.4.1.1466.115.121.1.12' : DN, # Distinguished Name
'1.3.6.1.4.1.1466.115.121.1.23' : bytes, # Fax
'1.3.6.1.4.1.1466.115.121.1.24' : datetime.datetime,
'1.3.6.1.4.1.1466.115.121.1.28' : bytes, # JPEG
'1.3.6.1.4.1.1466.115.121.1.40' : bytes, # OctetString (same as Binary)
'1.3.6.1.4.1.1466.115.121.1.49' : bytes, # Supported Algorithm
'1.3.6.1.4.1.1466.115.121.1.51' : bytes, # Teletext Terminal Identifier
'2.16.840.1.113730.3.8.3.3' : DN, # enrolledBy
'2.16.840.1.113730.3.8.3.18' : DN, # managedBy
'2.16.840.1.113730.3.8.3.5' : DN, # memberUser
'2.16.840.1.113730.3.8.3.7' : DN, # memberHost
'2.16.840.1.113730.3.8.3.20' : DN, # memberService
'2.16.840.1.113730.3.8.11.4' : DN, # ipaNTFallbackPrimaryGroup
'2.16.840.1.113730.3.8.11.21' : DN, # ipaAllowToImpersonate
'2.16.840.1.113730.3.8.11.22' : DN, # ipaAllowedTarget
'2.16.840.1.113730.3.8.7.1' : DN, # memberAllowCmd
'2.16.840.1.113730.3.8.7.2' : DN, # memberDenyCmd
'2.16.840.1.113719.1.301.4.14.1' : DN, # krbRealmReferences
'2.16.840.1.113719.1.301.4.17.1' : DN, # krbKdcServers
'2.16.840.1.113719.1.301.4.18.1' : DN, # krbPwdServers
'2.16.840.1.113719.1.301.4.26.1' : DN, # krbPrincipalReferences
'2.16.840.1.113719.1.301.4.29.1' : DN, # krbAdmServers
'2.16.840.1.113719.1.301.4.36.1' : DN, # krbPwdPolicyReference
'2.16.840.1.113719.1.301.4.40.1' : DN, # krbTicketPolicyReference
'2.16.840.1.113719.1.301.4.41.1' : DN, # krbSubTrees
'2.16.840.1.113719.1.301.4.52.1' : DN, # krbObjectReferences
'2.16.840.1.113719.1.301.4.53.1' : DN, # krbPrincContainerRef
}
# In most cases we lookup the syntax from the schema returned by
# the server. However, sometimes attributes may not be defined in
# the schema (e.g. extensibleObject which permits undefined
# attributes), or the schema was incorrectly defined (i.e. giving
# an attribute the syntax DirectoryString when in fact it's really
# a DN). This (hopefully sparse) table allows us to trap these
# anomalies and force them to be the syntax we know to be in use.
#
# FWIW, many entries under cn=config are undefined :-(
_SYNTAX_OVERRIDE = CIDict({
'managedtemplate': DN,
'managedbase': DN,
'memberindirect': DN,
'memberofindirect':DN,
'originscope': DN,
'idnsname': DNSName,
'idnssoamname': DNSName,
'idnssoarname': DNSName,
'dnszoneidnsname': DNSName,
'krbcanonicalname': Principal,
'krbprincipalname': Principal,
'nsds5replicalastupdatestart': unicode,
'nsds5replicalastupdateend': unicode,
'nsds5replicalastinitstart': unicode,
'nsds5replicalastinitend': unicode,
})
_SINGLE_VALUE_OVERRIDE = CIDict({
'nsslapd-ssl-check-hostname': True,
'nsslapd-lookthroughlimit': True,
'nsslapd-idlistscanlimit': True,
'nsslapd-anonlimitsdn': True,
'nsslapd-minssf-exclude-rootdse': True,
})
time_limit = -1.0 # unlimited
size_limit = 0 # unlimited
def __init__(self, ldap_uri, start_tls=False, force_schema_updates=False,
no_schema=False, decode_attrs=True, cacert=None,
sasl_nocanon=False):
"""Create LDAPClient object.
:param ldap_uri: The LDAP URI to connect to
:param start_tls: Use STARTTLS
:param force_schema_updates:
If true, this object will always request a new schema from the
server. If false, a cached schema will be reused if it exists.
Generally, it should be true if the API context is 'installer' or
'updates', but it must be given explicitly since the API object
is not always available
:param no_schema: If true, schema is never requested from the server.
:param decode_attrs:
If true, attributes are decoded to Python types according to their
syntax.
"""
self.ldap_uri = ldap_uri
self._start_tls = start_tls
self._force_schema_updates = force_schema_updates
self._no_schema = no_schema
self._decode_attrs = decode_attrs
self._cacert = cacert
self._sasl_nocanon = sasl_nocanon
self.host = 'localhost'
self.port = None
url_data = urlparse(ldap_uri)
self._protocol = url_data.scheme
if self._protocol in ('ldap', 'ldaps'):
self.host = url_data.hostname
self.port = url_data.port
self.log = log_mgr.get_logger(self)
self._has_schema = False
self._schema = None
self._conn = self._connect()
def __str__(self):
return self.ldap_uri
def modify_s(self, dn, modlist):
# FIXME: for backwards compatibility only
assert isinstance(dn, DN)
dn = str(dn)
modlist = [(a, b, self.encode(c)) for a, b, c in modlist]
return self.conn.modify_s(dn, modlist)
@property
def conn(self):
return self._conn
def _get_schema(self):
if self._no_schema:
return None
if not self._has_schema:
try:
schema = schema_cache.get_schema(
self.ldap_uri, self.conn,
force_update=self._force_schema_updates)
except (errors.ExecutionError, IndexError):
schema = None
# bypass ldap2's locking
object.__setattr__(self, '_schema', schema)
object.__setattr__(self, '_has_schema', True)
return self._schema
def _flush_schema(self):
'''
Force this instance to forget it's cached schema and reacquire
it from the schema cache.
'''
# Currently this is called during bind operations to assure
# we're working with valid schema for a specific
# connection. This causes self._get_schema() to query the
# schema cache for the server's schema passing along a flag
# indicating if we're in a context that requires freshly
# loading the schema vs. returning the last cached version of
# the schema. If we're in a mode that permits use of
# previously cached schema the flush and reacquire is a very
# low cost operation.
#
# The schema is reacquired whenever this object is
# instantiated or when binding occurs. The schema is not
# reacquired for operations during a bound connection, it is
# presumed schema cannot change during this interval. This
# provides for maximum efficiency in contexts which do need
# schema refreshing by only peforming the refresh inbetween
# logical operations that have the potential to cause a schema
# change.
# bypass ldap2's locking
object.__setattr__(self, '_has_schema', False)
object.__setattr__(self, '_schema', None)
def get_attribute_type(self, name_or_oid):
if not self._decode_attrs:
return bytes
if six.PY2:
if isinstance(name_or_oid, unicode):
name_or_oid = name_or_oid.encode('utf-8')
# Is this a special case attribute?
if name_or_oid in self._SYNTAX_OVERRIDE:
return self._SYNTAX_OVERRIDE[name_or_oid]
schema = self._get_schema()
if schema is not None:
# Try to lookup the syntax in the schema returned by the server
obj = schema.get_obj(ldap.schema.AttributeType, name_or_oid)
if obj is not None and obj.syntax in self._SYNTAX_MAPPING:
return self._SYNTAX_MAPPING[obj.syntax]
return unicode
def has_dn_syntax(self, name_or_oid):
"""
Check the schema to see if the attribute uses DN syntax.
Returns True/False
"""
return self.get_attribute_type(name_or_oid) is DN
def get_attribute_single_value(self, name_or_oid):
"""
Check the schema to see if the attribute is single-valued.
If the attribute is in the schema then returns True/False
If there is a problem loading the schema or the attribute is
not in the schema return None
"""
if six.PY2 and isinstance(name_or_oid, unicode):
name_or_oid = name_or_oid.encode('utf-8')
if name_or_oid in self._SINGLE_VALUE_OVERRIDE:
return self._SINGLE_VALUE_OVERRIDE[name_or_oid]
schema = self._get_schema()
if schema is not None:
obj = schema.get_obj(ldap.schema.AttributeType, name_or_oid)
if obj is not None:
return obj.single_value
return None
def encode(self, val):
"""
Encode attribute value to LDAP representation (str).
"""
# Booleans are both an instance of bool and int, therefore
# test for bool before int otherwise the int clause will be
# entered for a boolean value instead of the boolean clause.
if isinstance(val, bool):
if val:
return 'TRUE'
else:
return 'FALSE'
elif isinstance(val, (unicode, six.integer_types, Decimal, DN,
Principal)):
return six.text_type(val).encode('utf-8')
elif isinstance(val, DNSName):
return val.to_text().encode('ascii')
elif isinstance(val, bytes):
return val
elif isinstance(val, list):
return [self.encode(m) for m in val]
elif isinstance(val, tuple):
return tuple(self.encode(m) for m in val)
elif isinstance(val, dict):
# key in dict must be str not bytes
dct = dict((k, self.encode(v)) for k, v in val.items())
return dct
elif isinstance(val, datetime.datetime):
return val.strftime(LDAP_GENERALIZED_TIME_FORMAT)
elif val is None:
return None
else:
raise TypeError("attempt to pass unsupported type to ldap, value=%s type=%s" %(val, type(val)))
def decode(self, val, attr):
"""
Decode attribute value from LDAP representation (str).
"""
if isinstance(val, bytes):
target_type = self.get_attribute_type(attr)
try:
if target_type is bytes:
return val
elif target_type is unicode:
return val.decode('utf-8')
elif target_type is datetime.datetime:
return datetime.datetime.strptime(
val.decode('utf-8'), LDAP_GENERALIZED_TIME_FORMAT)
elif target_type is DNSName:
return DNSName.from_text(val.decode('utf-8'))
elif target_type in (DN, Principal):
return target_type(val.decode('utf-8'))
else:
return target_type(val)
except Exception:
msg = 'unable to convert the attribute %r value %r to type %s' % (attr, val, target_type)
self.log.error(msg)
raise ValueError(msg)
elif isinstance(val, list):
return [self.decode(m, attr) for m in val]
elif isinstance(val, tuple):
return tuple(self.decode(m, attr) for m in val)
elif isinstance(val, dict):
dct = {
k.decode('utf-8'): self.decode(v, k) for k, v in val.items()
}
return dct
elif val is None:
return None
else:
raise TypeError("attempt to pass unsupported type from ldap, value=%s type=%s" %(val, type(val)))
def _convert_result(self, result):
'''
result is a python-ldap result tuple of the form (dn, attrs),
where dn is a string containing the dn (distinguished name) of
the entry, and attrs is a dictionary containing the attributes
associated with the entry. The keys of attrs are strings, and
the associated values are lists of strings.
We convert the tuple to an LDAPEntry object.
'''
ipa_result = []
for dn_tuple in result:
original_dn = dn_tuple[0]
original_attrs = dn_tuple[1]
# original_dn is None if referral instead of an entry was
# returned from the LDAP server, we need to skip this item
if original_dn is None:
log_msg = 'Referral entry ignored: {ref}'\
.format(ref=str(original_attrs))
self.log.debug(log_msg)
continue
ipa_entry = LDAPEntry(self, DN(original_dn))
for attr, original_values in original_attrs.items():
ipa_entry.raw[attr] = original_values
ipa_entry.reset_modlist()
ipa_result.append(ipa_entry)
if _debug_log_ldap:
self.log.debug('ldap.result: %s', ipa_result)
return ipa_result
@contextlib.contextmanager
def error_handler(self, arg_desc=None):
"""Context manager that handles LDAPErrors
"""
try:
try:
yield
except ldap.TIMEOUT:
raise errors.DatabaseTimeout()
except ldap.LDAPError as e:
desc = e.args[0]['desc'].strip()
info = e.args[0].get('info', '').strip()
if arg_desc is not None:
info = "%s arguments: %s" % (info, arg_desc)
raise
except ldap.NO_SUCH_OBJECT:
raise errors.NotFound(reason=arg_desc or 'no such entry')
except ldap.ALREADY_EXISTS:
raise errors.DuplicateEntry()
except ldap.CONSTRAINT_VIOLATION:
# This error gets thrown by the uniqueness plugin
_msg = 'Another entry with the same attribute value already exists'
if info.startswith(_msg):
raise errors.DuplicateEntry()
else:
raise errors.DatabaseError(desc=desc, info=info)
except ldap.INSUFFICIENT_ACCESS:
raise errors.ACIError(info=info)
except ldap.INVALID_CREDENTIALS:
raise errors.ACIError(info="%s %s" % (info, desc))
except ldap.INAPPROPRIATE_AUTH:
raise errors.ACIError(info="%s: %s" % (desc, info))
except ldap.NO_SUCH_ATTRIBUTE:
# this is raised when a 'delete' attribute isn't found.
# it indicates the previous attribute was removed by another
# update, making the oldentry stale.
raise errors.MidairCollision()
except ldap.INVALID_SYNTAX:
raise errors.InvalidSyntax(attr=info)
except ldap.OBJECT_CLASS_VIOLATION:
raise errors.ObjectclassViolation(info=info)
except ldap.ADMINLIMIT_EXCEEDED:
raise errors.AdminLimitExceeded()
except ldap.SIZELIMIT_EXCEEDED:
raise errors.SizeLimitExceeded()
except ldap.TIMELIMIT_EXCEEDED:
raise errors.TimeLimitExceeded()
except ldap.NOT_ALLOWED_ON_RDN:
raise errors.NotAllowedOnRDN(attr=info)
except ldap.FILTER_ERROR:
raise errors.BadSearchFilter(info=info)
except ldap.NOT_ALLOWED_ON_NONLEAF:
raise errors.NotAllowedOnNonLeaf()
except ldap.SERVER_DOWN:
raise errors.NetworkError(uri=self.ldap_uri,
error=info)
except ldap.LOCAL_ERROR:
raise errors.ACIError(info=info)
except ldap.SUCCESS:
pass
except ldap.CONNECT_ERROR:
raise errors.DatabaseError(desc=desc, info=info)
except ldap.UNWILLING_TO_PERFORM:
raise errors.DatabaseError(desc=desc, info=info)
except ldap.AUTH_UNKNOWN:
raise errors.ACIError(info='%s (%s)' % (info,desc))
except ldap.LDAPError as e:
if 'NOT_ALLOWED_TO_DELEGATE' in info:
raise errors.ACIError(
info="KDC returned NOT_ALLOWED_TO_DELEGATE")
self.log.debug(
'Unhandled LDAPError: %s: %s' % (type(e).__name__, str(e)))
raise errors.DatabaseError(desc=desc, info=info)
@staticmethod
def handle_truncated_result(truncated):
if not truncated:
return
if truncated is TRUNCATED_ADMIN_LIMIT:
raise errors.AdminLimitExceeded()
elif truncated is TRUNCATED_SIZE_LIMIT:
raise errors.SizeLimitExceeded()
elif truncated is TRUNCATED_TIME_LIMIT:
raise errors.TimeLimitExceeded()
else:
raise errors.LimitsExceeded()
@property
def schema(self):
"""schema associated with this LDAP server"""
return self._get_schema()
def get_allowed_attributes(self, objectclasses, raise_on_unknown=False):
if self.schema is None:
return None
allowed_attributes = []
for oc in objectclasses:
obj = self.schema.get_obj(ldap.schema.ObjectClass, oc)
if obj is not None:
allowed_attributes += obj.must + obj.may
elif raise_on_unknown:
raise errors.NotFound(
reason=_('objectclass %s not found') % oc)
return [unicode(a).lower() for a in list(set(allowed_attributes))]
def __del__(self):
self.close()
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
self.close()
def close(self):
"""
Close the connection.
"""
self._conn = None
def _connect(self):
with self.error_handler():
conn = ldap.initialize(self.ldap_uri)
if self._start_tls or self._protocol == 'ldaps':
ldap.set_option(ldap.OPT_X_TLS_CACERTFILE, self._cacert)
ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, True)
conn.set_option(ldap.OPT_X_TLS_DEMAND, True)
if self._sasl_nocanon:
conn.set_option(ldap.OPT_X_SASL_NOCANON, ldap.OPT_ON)
if self._start_tls:
conn.start_tls_s()
return conn
def simple_bind(self, bind_dn, bind_password, server_controls=None,
client_controls=None):
"""
Perform simple bind operation.
"""
with self.error_handler():
self._flush_schema()
assert isinstance(bind_dn, DN)
bind_dn = str(bind_dn)
bind_password = self.encode(bind_password)
self.conn.simple_bind_s(
bind_dn, bind_password, server_controls, client_controls)
def external_bind(self, server_controls=None, client_controls=None):
"""
Perform SASL bind operation using the SASL EXTERNAL mechanism.
"""
user_name = pwd.getpwuid(os.geteuid()).pw_name
with self.error_handler():
auth_tokens = ldap.sasl.external(user_name)
self._flush_schema()
self.conn.sasl_interactive_bind_s(
'', auth_tokens, server_controls, client_controls)
def gssapi_bind(self, server_controls=None, client_controls=None):
"""
Perform SASL bind operation using the SASL GSSAPI mechanism.
"""
with self.error_handler():
if self._protocol == 'ldapi':
auth_tokens = SASL_GSS_SPNEGO
else:
auth_tokens = SASL_GSSAPI
self._flush_schema()
self.conn.sasl_interactive_bind_s(
'', auth_tokens, server_controls, client_controls)
def unbind(self):
"""
Perform unbind operation.
"""
with self.error_handler():
self._flush_schema()
self.conn.unbind_s()
def make_dn_from_attr(self, attr, value, parent_dn=None):
"""
Make distinguished name from attribute.
Keyword arguments:
parent_dn -- DN of the parent entry (default '')
"""
if parent_dn is None:
parent_dn = DN()
if isinstance(value, (list, tuple)):
value = value[0]
return DN((attr, value), parent_dn)
def make_dn(self, entry_attrs, primary_key='cn', parent_dn=None):
"""
Make distinguished name from entry attributes.
Keyword arguments:
primary_key -- attribute from which to make RDN (default 'cn')
parent_dn -- DN of the parent entry (default '')
"""
assert primary_key in entry_attrs
assert isinstance(parent_dn, DN)
return DN((primary_key, entry_attrs[primary_key]), parent_dn)
def make_entry(self, _dn=None, _obj=None, **kwargs):
return LDAPEntry(self, _dn, _obj, **kwargs)
# generating filters for find_entry
# some examples:
# f1 = ldap2.make_filter_from_attr(u'firstName', u'Pavel')
# f2 = ldap2.make_filter_from_attr(u'lastName', u'Zuna')
# f = ldap2.combine_filters([f1, f2], ldap2.MATCH_ALL)
# # f should be (&(firstName=Pavel)(lastName=Zuna))
# # it should be equivalent to:
# entry_attrs = {u'firstName': u'Pavel', u'lastName': u'Zuna'}
# f = ldap2.make_filter(entry_attrs, rules=ldap2.MATCH_ALL)
@classmethod
def combine_filters(cls, filters, rules='|'):
"""
Combine filters into one for ldap2.find_entries.
Keyword arguments:
rules -- see ldap2.make_filter
"""
assert isinstance(filters, (list, tuple))
filters = [f for f in filters if f]
if filters and rules == cls.MATCH_NONE: # unary operator
return '(%s%s)' % (cls.MATCH_NONE,
cls.combine_filters(filters, cls.MATCH_ANY))
if len(filters) > 1:
flt = '(%s' % rules
else:
flt = ''
for f in filters:
if not f.startswith('('):
f = '(%s)' % f
flt = '%s%s' % (flt, f)
if len(filters) > 1:
flt = '%s)' % flt
return flt
@classmethod
def make_filter_from_attr(
cls, attr, value, rules='|', exact=True,
leading_wildcard=True, trailing_wildcard=True):
"""
Make filter for ldap2.find_entries from attribute.
Keyword arguments:
rules -- see ldap2.make_filter
exact -- boolean, True - make filter as (attr=value)
False - make filter as (attr=*value*)
leading_wildcard -- boolean:
True - allow heading filter wildcard when exact=False
False - forbid heading filter wildcard when exact=False
trailing_wildcard -- boolean:
True - allow trailing filter wildcard when exact=False
False - forbid trailing filter wildcard when exact=False
"""
if isinstance(value, (list, tuple)):
flts = [
cls.make_filter_from_attr(
attr, v, exact=exact,
leading_wildcard=leading_wildcard,
trailing_wildcard=trailing_wildcard)
for v in value
]
return cls.combine_filters(flts, rules)
elif value is not None:
if isinstance(value, bytes):
value = binascii.hexlify(value).decode('ascii')
# value[-2:0] is empty string for the initial '\\'
value = u'\\'.join(
value[i:i+2] for i in six.moves.range(-2, len(value), 2))
else:
value = six.text_type(value)
value = ldap.filter.escape_filter_chars(value)
if not exact:
template = '%s'
if leading_wildcard:
template = '*' + template
if trailing_wildcard:
template = template + '*'
value = template % value
if rules == cls.MATCH_NONE:
return '(!(%s=%s))' % (attr, value)
return '(%s=%s)' % (attr, value)
return ''
@classmethod
def make_filter(
cls, entry_attrs, attrs_list=None, rules='|', exact=True,
leading_wildcard=True, trailing_wildcard=True):
"""
Make filter for ldap2.find_entries from entry attributes.
Keyword arguments:
attrs_list -- list of attributes to use, all if None (default None)
rules -- specifies how to determine a match (default ldap2.MATCH_ANY)
exact -- boolean, True - make filter as (attr=value)
False - make filter as (attr=*value*)
leading_wildcard -- boolean:
True - allow heading filter wildcard when exact=False
False - forbid heading filter wildcard when exact=False
trailing_wildcard -- boolean:
True - allow trailing filter wildcard when exact=False
False - forbid trailing filter wildcard when exact=False
rules can be one of the following:
ldap2.MATCH_NONE - match entries that do not match any attribute
ldap2.MATCH_ALL - match entries that match all attributes
ldap2.MATCH_ANY - match entries that match any of attribute
"""
if rules == cls.MATCH_NONE:
make_filter_rules = cls.MATCH_ANY
else:
make_filter_rules = rules
flts = []
if attrs_list is None:
for (k, v) in entry_attrs.items():
flts.append(
cls.make_filter_from_attr(
k, v, make_filter_rules, exact,
leading_wildcard, trailing_wildcard)
)
else:
for a in attrs_list:
value = entry_attrs.get(a, None)
if value is not None:
flts.append(
cls.make_filter_from_attr(
a, value, make_filter_rules, exact,
leading_wildcard, trailing_wildcard)
)
return cls.combine_filters(flts, rules)
def get_entries(self, base_dn, scope=ldap.SCOPE_SUBTREE, filter=None,
attrs_list=None, **kwargs):
"""Return a list of matching entries.
:raises: errors.LimitsExceeded if the list is truncated by the server
:raises: errors.NotFound if result set is empty
or base_dn doesn't exist
:param base_dn: dn of the entry at which to start the search
:param scope: search scope, see LDAP docs (default ldap2.SCOPE_SUBTREE)
:param filter: LDAP filter to apply
:param attrs_list: ist of attributes to return, all if None (default)
:param kwargs: additional keyword arguments. See find_entries method
for their description.
"""
entries, truncated = self.find_entries(
base_dn=base_dn, scope=scope, filter=filter, attrs_list=attrs_list,
**kwargs)
try:
self.handle_truncated_result(truncated)
except errors.LimitsExceeded as e:
self.log.error(
"{} while getting entries (base DN: {}, filter: {})".format(
e, base_dn, filter
)
)
raise
return entries
def find_entries(self, filter=None, attrs_list=None, base_dn=None,
scope=ldap.SCOPE_SUBTREE, time_limit=None,
size_limit=None, paged_search=False):
"""
Return a list of entries and indication of whether the results were
truncated ([(dn, entry_attrs)], truncated) matching specified search
parameters followed by truncated flag. If the truncated flag is True,
search hit a server limit and its results are incomplete.
Keyword arguments:
attrs_list -- list of attributes to return, all if None (default None)
base_dn -- dn of the entry at which to start the search (default '')
scope -- search scope, see LDAP docs (default ldap2.SCOPE_SUBTREE)
time_limit -- time limit in seconds (default unlimited)
size_limit -- size (number of entries returned) limit
(default unlimited)
paged_search -- search using paged results control
:raises: errors.NotFound if result set is empty
or base_dn doesn't exist
"""
if base_dn is None:
base_dn = DN()
assert isinstance(base_dn, DN)
if not filter:
filter = '(objectClass=*)'
res = []
truncated = False
if time_limit is None:
time_limit = self.time_limit
if time_limit == 0:
time_limit = -1.0
if size_limit is None:
size_limit = self.size_limit
if not isinstance(size_limit, int):
size_limit = int(size_limit)
if not isinstance(time_limit, float):
time_limit = float(time_limit)
if attrs_list:
attrs_list = [a.lower() for a in set(attrs_list)]
sctrls = None
cookie = ''
page_size = (size_limit if size_limit > 0 else 2000) - 1
if page_size == 0:
paged_search = False
# pass arguments to python-ldap
with self.error_handler():
if six.PY2:
filter = self.encode(filter)
attrs_list = self.encode(attrs_list)
while True:
if paged_search:
sctrls = [SimplePagedResultsControl(0, page_size, cookie)]
try:
id = self.conn.search_ext(
str(base_dn), scope, filter, attrs_list,
serverctrls=sctrls, timeout=time_limit,
sizelimit=size_limit
)
while True:
result = self.conn.result3(id, 0)
objtype, res_list, _res_id, res_ctrls = result
if objtype == ldap.RES_SEARCH_RESULT:
break
res_list = self._convert_result(res_list)
if res_list:
res.append(res_list[0])
if paged_search:
# Get cookie for the next page
for ctrl in res_ctrls:
if isinstance(ctrl, SimplePagedResultsControl):
cookie = ctrl.cookie
break
else:
cookie = ''
except ldap.ADMINLIMIT_EXCEEDED:
truncated = TRUNCATED_ADMIN_LIMIT
break
except ldap.SIZELIMIT_EXCEEDED:
truncated = TRUNCATED_SIZE_LIMIT
break
except ldap.TIMELIMIT_EXCEEDED:
truncated = TRUNCATED_TIME_LIMIT
break
except ldap.LDAPError as e:
# If paged search is in progress, try to cancel it
if paged_search and cookie:
sctrls = [SimplePagedResultsControl(0, 0, cookie)]
try:
self.conn.search_ext_s(
str(base_dn), scope, filter, attrs_list,
serverctrls=sctrls, timeout=time_limit,
sizelimit=size_limit)
except ldap.LDAPError as e:
self.log.warning(
"Error cancelling paged search: %s", e)
cookie = ''
try:
raise e
except (ldap.ADMINLIMIT_EXCEEDED, ldap.TIMELIMIT_EXCEEDED,
ldap.SIZELIMIT_EXCEEDED):
truncated = True
break
if not paged_search or not cookie:
break
if not res and not truncated:
raise errors.EmptyResult(reason='no matching entry found')
return (res, truncated)
def find_entry_by_attr(self, attr, value, object_class, attrs_list=None,
base_dn=None):
"""
Find entry (dn, entry_attrs) by attribute and object class.
Keyword arguments:
attrs_list - list of attributes to return, all if None (default None)
base_dn - dn of the entry at which to start the search (default '')
"""
if base_dn is None:
base_dn = DN()
assert isinstance(base_dn, DN)
search_kw = {attr: value, 'objectClass': object_class}
filter = self.make_filter(search_kw, rules=self.MATCH_ALL)
entries = self.get_entries(
base_dn, filter=filter, attrs_list=attrs_list)
if len(entries) > 1:
raise errors.SingleMatchExpected(found=len(entries))
return entries[0]
def get_entry(self, dn, attrs_list=None, time_limit=None,
size_limit=None):
"""
Get entry (dn, entry_attrs) by dn.
Keyword arguments:
attrs_list - list of attributes to return, all if None (default None)
"""
assert isinstance(dn, DN)
entries = self.get_entries(
dn, self.SCOPE_BASE, None, attrs_list, time_limit=time_limit,
size_limit=size_limit
)
return entries[0]
def add_entry(self, entry):
"""Create a new entry.
This should be called as add_entry(entry).
"""
# remove all [] values (python-ldap hates 'em)
attrs = dict((k, v) for k, v in entry.raw.items() if v)
with self.error_handler():
attrs = self.encode(attrs)
self.conn.add_s(str(entry.dn), list(attrs.items()))
entry.reset_modlist()
def move_entry(self, dn, new_dn, del_old=True):
"""
Move an entry (either to a new superior or/and changing relative distinguished name)
Keyword arguments:
dn: DN of the source entry
new_dn: DN of the target entry
del_old -- delete old RDN value (default True)
:raises:
errors.NotFound if source entry or target superior entry doesn't exist
errors.EmptyModlist if source and target are identical
"""
assert isinstance(dn, DN)
assert isinstance(new_dn, DN)
if new_dn == dn:
raise errors.EmptyModlist()
new_rdn = new_dn[0]
if new_dn[1:] == dn[1:]:
new_superior = None
else:
new_superior = str(DN(*new_dn[1:]))
with self.error_handler():
self.conn.rename_s(str(dn), str(new_rdn), newsuperior=new_superior,
delold=int(del_old))
time.sleep(.3) # Give memberOf plugin a chance to work
def update_entry(self, entry):
"""Update entry's attributes.
This should be called as update_entry(entry).
"""
# generate modlist
modlist = entry.generate_modlist()
if not modlist:
raise errors.EmptyModlist()
# pass arguments to python-ldap
with self.error_handler():
modlist = [(a, str(b), self.encode(c))
for a, b, c in modlist]
self.conn.modify_s(str(entry.dn), modlist)
entry.reset_modlist()
def delete_entry(self, entry_or_dn):
"""Delete an entry given either the DN or the entry itself"""
if isinstance(entry_or_dn, DN):
dn = entry_or_dn
else:
dn = entry_or_dn.dn
with self.error_handler():
self.conn.delete_s(str(dn))
def entry_exists(self, dn):
"""
Test whether the given object exists in LDAP.
"""
assert isinstance(dn, DN)
try:
self.get_entry(dn, attrs_list=[])
except errors.NotFound:
return False
else:
return True
def get_ldap_uri(host='', port=389, cacert=None, ldapi=False, realm=None,
protocol=None):
if protocol is None:
if ldapi:
protocol = 'ldapi'
elif cacert is not None:
protocol = 'ldaps'
else:
protocol = 'ldap'
if protocol == 'ldaps':
return 'ldaps://%s' % format_netloc(host, port)
elif protocol == 'ldapi':
return 'ldapi://%%2fvar%%2frun%%2fslapd-%s.socket' % (
"-".join(realm.split(".")))
elif protocol == 'ldap':
return 'ldap://%s' % format_netloc(host, port)
else:
raise ValueError('Protocol %r not supported' % protocol)
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