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# group.py - group entry lookup routines
#
# Copyright (C) 2010-2017 Arthur de Jong
#
# This library 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.
#
# This library 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 this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
import logging
from ldap.filter import escape_filter_chars
import ldap
import cache
import cfg
import common
import constants
import passwd
import search
def clean(lst):
if lst:
for i in lst:
yield i.replace('\0', '')
attmap = common.Attributes(cn='cn',
userPassword='"*"',
gidNumber='gidNumber',
memberUid='memberUid',
member='member')
filter = '(objectClass=posixGroup)'
class Search(search.LDAPSearch):
case_sensitive = ('cn', )
limit_attributes = ('cn', 'gidNumber')
def __init__(self, *args, **kwargs):
super(Search, self).__init__(*args, **kwargs)
if (cfg.nss_getgrent_skipmembers or
'memberUid' in self.parameters or
'member' in self.parameters):
# set up our own attributes that leave out membership attributes
self.attributes = list(self.attributes)
if attmap['memberUid'] in self.attributes:
self.attributes.remove(attmap['memberUid'])
if attmap['member'] in self.attributes:
self.attributes.remove(attmap['member'])
def mk_filter(self):
# we still need a custom mk_filter because this is an | query
if attmap['member'] and 'memberUid' in self.parameters:
memberuid = self.parameters['memberUid']
entry = passwd.uid2entry(self.conn, memberuid)
if entry:
return '(&%s(|(%s=%s)(%s=%s)))' % (
self.filter,
attmap['memberUid'], escape_filter_chars(memberuid),
attmap['member'], escape_filter_chars(entry[0])
)
if 'gidNumber' in self.parameters:
self.parameters['gidNumber'] -= cfg.nss_gid_offset
return super(Search, self).mk_filter()
class Cache(cache.Cache):
tables = ('group_cache', 'group_member_cache')
create_sql = '''
CREATE TABLE IF NOT EXISTS `group_cache`
( `cn` TEXT PRIMARY KEY,
`userPassword` TEXT,
`gidNumber` INTEGER NOT NULL UNIQUE,
`mtime` TIMESTAMP NOT NULL );
CREATE TABLE IF NOT EXISTS `group_member_cache`
( `group` TEXT NOT NULL,
`memberUid` TEXT NOT NULL,
FOREIGN KEY(`group`) REFERENCES `group_cache`(`cn`)
ON DELETE CASCADE ON UPDATE CASCADE );
CREATE INDEX IF NOT EXISTS `group_member_idx` ON `group_member_cache`(`group`);
'''
retrieve_sql = '''
SELECT `group_cache`.`cn` AS `cn`, `userPassword`, `gidNumber`,
`memberUid`, `mtime`
FROM `group_cache`
LEFT JOIN `group_member_cache`
ON `group_member_cache`.`group` = `group_cache`.`cn`
'''
retrieve_by = dict(
memberUid='''
`cn` IN (
SELECT `a`.`group`
FROM `group_member_cache` `a`
WHERE `a`.`memberUid` = ?)
''',
)
group_by = (0, ) # cn
group_columns = (3, ) # memberUid
class GroupRequest(common.Request):
def write(self, name, passwd, gid, members):
self.fp.write_string(name)
self.fp.write_string(passwd)
self.fp.write_int32(gid)
self.fp.write_stringlist(members)
def get_members(self, attributes, members, subgroups, seen):
# add the memberUid values
for member in clean(attributes['memberUid']):
if common.is_valid_name(member):
members.add(member)
# translate and add the member values
if attmap['member']:
for memberdn in clean(attributes['member']):
if memberdn in seen:
continue
seen.add(memberdn)
member = passwd.dn2uid(self.conn, memberdn)
if member and common.is_valid_name(member):
members.add(member)
elif cfg.nss_nested_groups:
subgroups.append(memberdn)
def convert(self, dn, attributes, parameters):
# get group names and check against requested group name
names = attributes['cn']
# get group password
try:
passwd = attributes['userPassword'][0]
except IndexError:
passwd = None
if not passwd or self.calleruid != 0:
passwd = '*'
# get group id(s)
gids = [int(x) + cfg.nss_gid_offset for x in attributes['gidNumber']]
# build member list
members = set()
subgroups = []
seen = set([dn])
self.get_members(attributes, members, subgroups, seen)
# go over subgroups to find more members
while subgroups:
memberdn = subgroups.pop(0)
for dn2, attributes2 in self.search(self.conn, base=memberdn, scope=ldap.SCOPE_BASE):
self.get_members(attributes2, members, subgroups, seen)
# actually return the results
for name in names:
if not common.is_valid_name(name):
logging.warning('%s: %s: denied by validnames option', dn,
attmap['cn'])
else:
for gid in gids:
yield (name, passwd, gid, members)
class GroupByNameRequest(GroupRequest):
action = constants.NSLCD_ACTION_GROUP_BYNAME
def read_parameters(self, fp):
name = fp.read_string()
common.validate_name(name)
return dict(cn=name)
class GroupByGidRequest(GroupRequest):
action = constants.NSLCD_ACTION_GROUP_BYGID
def read_parameters(self, fp):
return dict(gidNumber=fp.read_int32())
class GroupByMemberRequest(GroupRequest):
action = constants.NSLCD_ACTION_GROUP_BYMEMBER
def read_parameters(self, fp):
memberuid = fp.read_string()
common.validate_name(memberuid)
return dict(memberUid=memberuid)
def get_results(self, parameters):
seen = set()
for dn, attributes in self.search(self.conn, parameters=parameters):
seen.add(dn)
for values in self.convert(dn, attributes, parameters):
yield values
if cfg.nss_nested_groups and attmap['member']:
tocheck = list(seen)
# find parent groups
while tocheck:
group = tocheck.pop(0)
for dn, attributes in self.search(self.conn, parameters=dict(member=group)):
if dn not in seen:
seen.add(dn)
tocheck.append(dn)
for result in self.convert(dn, attributes, parameters):
yield result
def handle_request(self, parameters):
# check whether requested user is in nss_initgroups_ignoreusers
if parameters['memberUid'] in cfg.nss_initgroups_ignoreusers:
# write the final result code to signify empty results
self.fp.write_int32(constants.NSLCD_RESULT_END)
return
return super(GroupByMemberRequest, self).handle_request(parameters)
class GroupAllRequest(GroupRequest):
action = constants.NSLCD_ACTION_GROUP_ALL
def handle_request(self, parameters):
if not cfg.nss_disable_enumeration:
return super(GroupAllRequest, self).handle_request(parameters)
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