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##
# Copyright (c) 2016 Rahul Amaram <amaramrahul@users.sourceforge.net>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##
"""
NSS Directory service interfaces.
Uses libc's Name Service Switch for user and groups (/etc/nsswitch.conf).
"""
import pwd
import grp
import PAM
from time import time
from uuid import UUID
from zope.interface import implementer
from twisted.internet.defer import succeed
from twext.python.log import Logger
from twistedcaldav.directory.util import uuidFromName
from .idirectory import (
RecordType,
FieldName,
IPlaintextPasswordVerifier
)
from .index import (
DirectoryService,
DirectoryRecord,
FieldName as IndexFieldName,
)
from .util import ConstantsContainer
__all__ = [
"NssDirectoryService",
]
# Logger
log = Logger()
def _generateUID(serviceGUID, recordType, shortName):
return unicode(uuidFromName(serviceGUID,
"%s:%s" % (recordType, shortName)),
"utf-8")
class NssDirectoryService(DirectoryService):
# Supported record types
recordType = ConstantsContainer(
(RecordType.user, RecordType.group)
)
_baseGUID = "8EFFFAF1-5221-4813-B971-58506B963573"
_lastRefresh = 0
def __init__(self, params):
"""
@param params: a dictionary containing the following keys:
realmName, groupPrefix, mailDomain, firstValidUid, lastValidUid,
firstValidGid, lastValidGid, refreshIntervalThreshold
"""
self.mailDomain = params["mailDomain"]
self.groupPrefix = params["groupPrefix"]
self.firstValidUid = params["firstValidUid"]
self.firstValidGid = params["firstValidGid"]
self.lastValidUid = params["lastValidUid"]
self.lastValidGid = params["lastValidGid"]
self.refreshIntervalThreshold = params["refreshIntervalThreshold"]
self.guid = uuidFromName(self._baseGUID, params["realmName"])
DirectoryService.__init__(self, realmName=params["realmName"])
def flush(self):
DirectoryService.flush(self)
_lastRefresh = 0
def _isValidUid(self, uid):
if uid >= self.firstValidUid and uid <= self.lastValidUid:
return True
def _isValidGid(self, gid):
if gid >= self.firstValidGid and gid <= self.lastValidGid:
return True
def loadRecords(self):
now = time()
if now - self._lastRefresh <= self.refreshIntervalThreshold:
return
log.info("Loading and indexing NSS records")
users = set()
groups = set()
records = set()
for result in pwd.getpwall():
if self._isValidUid(result[2]):
record = NssUserRecord.fromUserName(
service=self,
userName=result[0],
gecos=result[4],
)
records.add(record)
users.add(result[0])
for result in grp.getgrall():
if result[0].startswith(self.groupPrefix) and \
self._isValidGid(result[2]):
record = NssGroupRecord.fromGroupName(
service=self,
groupName=result[0],
members=result[3]
)
records.add(record)
groups.add(result[0])
log.debug("Processed NSS Users: {}".format(users))
log.debug("Processed NSS Groups: {}".format(groups))
# Store results
self.flush()
self.indexRecords(records)
_lastRefresh = now
@implementer(IPlaintextPasswordVerifier)
class NssUserRecord(DirectoryRecord):
"""
NSS Users implementation of L{IDirectoryRecord}.
"""
@classmethod
def fromUserName(cls, service, userName, gecos):
uid = _generateUID(service.guid, "users", userName)
guid = UUID(uid)
shortNames = (unicode(userName, "utf-8"),)
fullNames = (unicode(gecos.split(",", 1)[0], "utf-8"),)
emailAddresses = set()
if service.mailDomain:
emailAddresses.add(unicode("%s@%s" %
(userName, service.mailDomain), "utf-8"))
log.debug("Creating user record with uid: %r, guid: %r, "
"shortNames: %r, fullNames: %r, emailAddresses: %r" %
(uid, guid, shortNames, fullNames, emailAddresses))
return cls(service, dict([
(FieldName.recordType, service.recordType.user),
(FieldName.uid, uid),
(FieldName.guid, guid),
(FieldName.shortNames, shortNames),
(FieldName.fullNames, fullNames),
(FieldName.emailAddresses, emailAddresses)
])
)
def verifyPlaintextPassword(self, password):
# Authenticate against PAM
def pam_conv(auth, query_list, userData):
return [(password, 0)]
auth = PAM.pam()
auth.start("caldav")
auth.set_item(PAM.PAM_USER, self.shortNames[0])
auth.set_item(PAM.PAM_CONV, pam_conv)
try:
auth.authenticate()
except PAM.error, resp:
return succeed(False)
else:
return succeed(True)
class NssGroupRecord(DirectoryRecord):
"""
NSS Groups implementation of L{IDirectoryRecord}.
"""
@classmethod
def fromGroupName(cls, service, groupName, members=()):
groupNameWithoutPrefix = groupName.replace(service.groupPrefix, '', 1)
uid = _generateUID(service.guid, "groups", groupNameWithoutPrefix)
guid = UUID(uid)
shortNames = (unicode(groupNameWithoutPrefix, "utf-8"),)
memberUIDs = tuple([_generateUID(service.guid, "users", userName)
for userName in members])
log.debug("Creating group record with uid: %r, guid: %r, "
"shortNames: %r, memberUIDs: %r" %
(uid, guid, shortNames, memberUIDs))
return cls(service, dict([
(FieldName.recordType, service.recordType.group),
(FieldName.uid, uid),
(FieldName.guid, guid),
(FieldName.shortNames, shortNames),
(IndexFieldName.memberUIDs, memberUIDs)
])
)
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