# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""cubicweb ldap feed source"""
from __future__ import division # XXX why?
from datetime import datetime
import ldap
from ldap.ldapobject import ReconnectLDAPObject
from ldap.filter import filter_format
from ldapurl import LDAPUrl
from logilab.common.configuration import merge_options
from cubicweb import ValidationError, AuthenticationError, Binary
from cubicweb.server import utils
from cubicweb.server.sources import datafeed
_ = unicode
# search scopes
BASE = ldap.SCOPE_BASE
ONELEVEL = ldap.SCOPE_ONELEVEL
SUBTREE = ldap.SCOPE_SUBTREE
LDAP_SCOPES = {'BASE': ldap.SCOPE_BASE,
'ONELEVEL': ldap.SCOPE_ONELEVEL,
'SUBTREE': ldap.SCOPE_SUBTREE}
# map ldap protocol to their standard port
PROTO_PORT = {'ldap': 389,
'ldaps': 636,
'ldapi': None,
}
class LDAPFeedSource(datafeed.DataFeedSource):
"""LDAP feed source: unlike ldapuser source, this source is copy based and
will import ldap content (beside passwords for authentication) into the
system source.
"""
support_entities = {'CWUser': False}
use_cwuri_as_url = False
options = (
('auth-mode',
{'type' : 'choice',
'default': 'simple',
'choices': ('simple', 'cram_md5', 'digest_md5', 'gssapi'),
'help': 'authentication mode used to authenticate user to the ldap.',
'group': 'ldap-source', 'level': 3,
}),
('auth-realm',
{'type' : 'string',
'default': None,
'help': 'realm to use when using gssapi/kerberos authentication.',
'group': 'ldap-source', 'level': 3,
}),
('data-cnx-dn',
{'type' : 'string',
'default': '',
'help': 'user dn to use to open data connection to the ldap (eg used \
to respond to rql queries). Leave empty for anonymous bind',
'group': 'ldap-source', 'level': 1,
}),
('data-cnx-password',
{'type' : 'string',
'default': '',
'help': 'password to use to open data connection to the ldap (eg used to respond to rql queries). Leave empty for anonymous bind.',
'group': 'ldap-source', 'level': 1,
}),
('user-base-dn',
{'type' : 'string',
'default': '',
'help': 'base DN to lookup for users; disable user importation mechanism if unset',
'group': 'ldap-source', 'level': 1,
}),
('user-scope',
{'type' : 'choice',
'default': 'ONELEVEL',
'choices': ('BASE', 'ONELEVEL', 'SUBTREE'),
'help': 'user search scope (valid values: "BASE", "ONELEVEL", "SUBTREE")',
'group': 'ldap-source', 'level': 1,
}),
('user-classes',
{'type' : 'csv',
'default': ('top', 'posixAccount'),
'help': 'classes of user (with Active Directory, you want to say "user" here)',
'group': 'ldap-source', 'level': 1,
}),
('user-filter',
{'type': 'string',
'default': '',
'help': 'additional filters to be set in the ldap query to find valid users',
'group': 'ldap-source', 'level': 2,
}),
('user-login-attr',
{'type' : 'string',
'default': 'uid',
'help': 'attribute used as login on authentication (with Active Directory, you want to use "sAMAccountName" here)',
'group': 'ldap-source', 'level': 1,
}),
('user-default-group',
{'type' : 'csv',
'default': ('users',),
'help': 'name of a group in which ldap users will be by default. \
You can set multiple groups by separating them by a comma.',
'group': 'ldap-source', 'level': 1,
}),
('user-attrs-map',
{'type' : 'named',
'default': {'uid': 'login'},
'help': 'map from ldap user attributes to cubicweb attributes (with Active Directory, you want to use sAMAccountName:login,mail:email,givenName:firstname,sn:surname)',
'group': 'ldap-source', 'level': 1,
}),
('group-base-dn',
{'type' : 'string',
'default': '',
'help': 'base DN to lookup for groups; disable group importation mechanism if unset',
'group': 'ldap-source', 'level': 1,
}),
('group-scope',
{'type' : 'choice',
'default': 'ONELEVEL',
'choices': ('BASE', 'ONELEVEL', 'SUBTREE'),
'help': 'group search scope (valid values: "BASE", "ONELEVEL", "SUBTREE")',
'group': 'ldap-source', 'level': 1,
}),
('group-classes',
{'type' : 'csv',
'default': ('top', 'posixGroup'),
'help': 'classes of group',
'group': 'ldap-source', 'level': 1,
}),
('group-filter',
{'type': 'string',
'default': '',
'help': 'additional filters to be set in the ldap query to find valid groups',
'group': 'ldap-source', 'level': 2,
}),
('group-attrs-map',
{'type' : 'named',
'default': {'cn': 'name', 'memberUid': 'member'},
'help': 'map from ldap group attributes to cubicweb attributes',
'group': 'ldap-source', 'level': 1,
}),
)
options = merge_options(datafeed.DataFeedSource.options + options,
optgroup='ldap-source',)
_conn = None
def update_config(self, source_entity, typedconfig):
"""update configuration from source entity. `typedconfig` is config
properly typed with defaults set
"""
super(LDAPFeedSource, self).update_config(source_entity, typedconfig)
self.authmode = typedconfig['auth-mode']
self._authenticate = getattr(self, '_auth_%s' % self.authmode)
self.cnx_dn = typedconfig['data-cnx-dn']
self.cnx_pwd = typedconfig['data-cnx-password']
self.user_base_dn = str(typedconfig['user-base-dn'])
self.user_base_scope = globals()[typedconfig['user-scope']]
self.user_login_attr = typedconfig['user-login-attr']
self.user_default_groups = typedconfig['user-default-group']
self.user_attrs = {'dn': 'eid', 'modifyTimestamp': 'modification_date'}
self.user_attrs.update(typedconfig['user-attrs-map'])
self.user_rev_attrs = dict((v, k) for k, v in self.user_attrs.iteritems())
self.base_filters = [filter_format('(%s=%s)', ('objectClass', o))
for o in typedconfig['user-classes']]
if typedconfig['user-filter']:
self.base_filters.append(typedconfig['user-filter'])
self.group_base_dn = str(typedconfig['group-base-dn'])
self.group_base_scope = LDAP_SCOPES[typedconfig['group-scope']]
self.group_attrs = typedconfig['group-attrs-map']
self.group_attrs = {'dn': 'eid', 'modifyTimestamp': 'modification_date'}
self.group_attrs.update(typedconfig['group-attrs-map'])
self.group_rev_attrs = dict((v, k) for k, v in self.group_attrs.iteritems())
self.group_base_filters = [filter_format('(%s=%s)', ('objectClass', o))
for o in typedconfig['group-classes']]
if typedconfig['group-filter']:
self.group_base_filters.append(typedconfig['group-filter'])
self._conn = None
def _entity_update(self, source_entity):
super(LDAPFeedSource, self)._entity_update(source_entity)
if self.urls:
if len(self.urls) > 1:
raise ValidationError(source_entity.eid, {'url': _('can only have one url')})
try:
protocol, hostport = self.urls[0].split('://')
except ValueError:
raise ValidationError(source_entity.eid, {'url': _('badly formatted url')})
if protocol not in PROTO_PORT:
raise ValidationError(source_entity.eid, {'url': _('unsupported protocol')})
def connection_info(self):
assert len(self.urls) == 1, self.urls
protocol, hostport = self.urls[0].split('://')
if protocol != 'ldapi' and not ':' in hostport:
hostport = '%s:%s' % (hostport, PROTO_PORT[protocol])
return protocol, hostport
def authenticate(self, cnx, login, password=None, **kwargs):
"""return CWUser eid for the given login/password if this account is
defined in this source, else raise `AuthenticationError`
two queries are needed since passwords are stored crypted, so we have
to fetch the salt first
"""
self.info('ldap authenticate %s', login)
if not password:
# On Windows + ADAM this would have succeeded (!!!)
# You get Authenticated as: 'NT AUTHORITY\ANONYMOUS LOGON'.
# we really really don't want that
raise AuthenticationError()
searchfilter = [filter_format('(%s=%s)', (self.user_login_attr, login))]
searchfilter.extend(self.base_filters)
searchstr = '(&%s)' % ''.join(searchfilter)
# first search the user
try:
user = self._search(cnx, self.user_base_dn,
self.user_base_scope, searchstr)[0]
except (IndexError, ldap.SERVER_DOWN):
# no such user
raise AuthenticationError()
# check password by establishing a (unused) connection
try:
self._connect(user, password)
except ldap.LDAPError as ex:
# Something went wrong, most likely bad credentials
self.info('while trying to authenticate %s: %s', user, ex)
raise AuthenticationError()
except Exception:
self.error('while trying to authenticate %s', user, exc_info=True)
raise AuthenticationError()
eid = self.repo.extid2eid(self, user['dn'], 'CWUser', cnx, insert=False)
if eid < 0:
# user has been moved away from this source
raise AuthenticationError()
return eid
def _connect(self, user=None, userpwd=None):
protocol, hostport = self.connection_info()
self.info('connecting %s://%s as %s', protocol, hostport,
user and user['dn'] or 'anonymous')
# don't require server certificate when using ldaps (will
# enable self signed certs)
ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, ldap.OPT_X_TLS_NEVER)
url = LDAPUrl(urlscheme=protocol, hostport=hostport)
conn = ReconnectLDAPObject(url.initializeUrl())
# Set the protocol version - version 3 is preferred
try:
conn.set_option(ldap.OPT_PROTOCOL_VERSION, ldap.VERSION3)
except ldap.LDAPError: # Invalid protocol version, fall back safely
conn.set_option(ldap.OPT_PROTOCOL_VERSION, ldap.VERSION2)
# Deny auto-chasing of referrals to be safe, we handle them instead
# Required for AD
try:
conn.set_option(ldap.OPT_REFERRALS, 0)
except ldap.LDAPError: # Cannot set referrals, so do nothing
pass
#conn.set_option(ldap.OPT_NETWORK_TIMEOUT, conn_timeout)
#conn.timeout = op_timeout
# Now bind with the credentials given. Let exceptions propagate out.
if user is None:
# XXX always use simple bind for data connection
if not self.cnx_dn:
conn.simple_bind_s(self.cnx_dn, self.cnx_pwd)
else:
self._authenticate(conn, {'dn': self.cnx_dn}, self.cnx_pwd)
else:
# user specified, we want to check user/password, no need to return
# the connection which will be thrown out
self._authenticate(conn, user, userpwd)
return conn
def _auth_simple(self, conn, user, userpwd):
conn.simple_bind_s(user['dn'], userpwd)
def _auth_cram_md5(self, conn, user, userpwd):
from ldap import sasl
auth_token = sasl.cram_md5(user['dn'], userpwd)
conn.sasl_interactive_bind_s('', auth_token)
def _auth_digest_md5(self, conn, user, userpwd):
from ldap import sasl
auth_token = sasl.digest_md5(user['dn'], userpwd)
conn.sasl_interactive_bind_s('', auth_token)
def _auth_gssapi(self, conn, user, userpwd):
# print XXX not proper sasl/gssapi
import kerberos
if not kerberos.checkPassword(user[self.user_login_attr], userpwd):
raise Exception('BAD login / mdp')
#from ldap import sasl
#conn.sasl_interactive_bind_s('', sasl.gssapi())
def _search(self, cnx, base, scope,
searchstr='(objectClass=*)', attrs=()):
"""make an ldap query"""
self.debug('ldap search %s %s %s %s %s', self.uri, base, scope,
searchstr, list(attrs))
if self._conn is None:
self._conn = self._connect()
ldapcnx = self._conn
try:
res = ldapcnx.search_s(base, scope, searchstr, attrs)
except ldap.PARTIAL_RESULTS:
res = ldapcnx.result(all=0)[1]
except ldap.NO_SUCH_OBJECT:
self.info('ldap NO SUCH OBJECT %s %s %s', base, scope, searchstr)
self._process_no_such_object(cnx, base)
return []
# except ldap.REFERRAL as e:
# ldapcnx = self.handle_referral(e)
# try:
# res = ldapcnx.search_s(base, scope, searchstr, attrs)
# except ldap.PARTIAL_RESULTS:
# res_type, res = ldapcnx.result(all=0)
result = []
for rec_dn, rec_dict in res:
# When used against Active Directory, "rec_dict" may not be
# be a dictionary in some cases (instead, it can be a list)
#
# An example of a useless "res" entry that can be ignored
# from AD is
# (None, ['ldap://ForestDnsZones.PORTAL.LOCAL/DC=ForestDnsZones,DC=PORTAL,DC=LOCAL'])
# This appears to be some sort of internal referral, but
# we can't handle it, so we need to skip over it.
try:
items = rec_dict.iteritems()
except AttributeError:
continue
else:
itemdict = self._process_ldap_item(rec_dn, items)
result.append(itemdict)
self.debug('ldap built results %s', len(result))
return result
def _process_ldap_item(self, dn, iterator):
"""Turn an ldap received item into a proper dict."""
itemdict = {'dn': dn}
for key, value in iterator:
if self.user_attrs.get(key) == 'upassword': # XXx better password detection
value = value[0].encode('utf-8')
# we only support ldap_salted_sha1 for ldap sources, see: server/utils.py
if not value.startswith('{SSHA}'):
value = utils.crypt_password(value)
itemdict[key] = Binary(value)
elif self.user_attrs.get(key) == 'modification_date':
itemdict[key] = datetime.strptime(value[0], '%Y%m%d%H%M%SZ')
else:
value = [unicode(val, 'utf-8', 'replace') for val in value]
if len(value) == 1:
itemdict[key] = value = value[0]
else:
itemdict[key] = value
# we expect memberUid to be a list of user ids, make sure of it
member = self.group_rev_attrs['member']
if isinstance(itemdict.get(member), basestring):
itemdict[member] = [itemdict[member]]
return itemdict
def _process_no_such_object(self, cnx, dn):
"""Some search return NO_SUCH_OBJECT error, handle this (usually because
an object whose dn is no more existent in ldap as been encountered).
Do nothing by default, let sub-classes handle that.
"""