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#!/usr/bin/env python
#
# Utility methods for security descriptor manipulation
#
# Copyright Nadezhda Ivanova 2010 <nivanova@samba.org>
#
# 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/>.
#
"""Utility methods for security descriptor manipulation."""
import samba
from ldb import Message, MessageElement, Dn
from ldb import FLAG_MOD_REPLACE, SCOPE_BASE
from samba.ndr import ndr_pack, ndr_unpack
from samba.dcerpc import security
class SDUtils(object):
"""Some utilities for manipulation of security descriptors
on objects"""
def __init__(self, samdb):
self.ldb = samdb
self.domain_sid = security.dom_sid(self.ldb.get_domain_sid())
def modify_sd_on_dn(self, object_dn, sd, controls=None):
""" Modify security descriptor using either SDDL string
or security.descriptor object
"""
m = Message()
m.dn = Dn(self.ldb, object_dn)
assert(isinstance(sd, str) or isinstance(sd, security.descriptor))
if isinstance(sd, str):
tmp_desc = security.descriptor.from_sddl(sd, self.domain_sid)
elif isinstance(sd, security.descriptor):
tmp_desc = sd
m["nTSecurityDescriptor"] = MessageElement(ndr_pack(tmp_desc),
FLAG_MOD_REPLACE,
"nTSecurityDescriptor")
self.ldb.modify(m, controls)
def read_sd_on_dn(self, object_dn, controls=None):
res = self.ldb.search(object_dn, SCOPE_BASE, None,
["nTSecurityDescriptor"], controls=controls)
desc = res[0]["nTSecurityDescriptor"][0]
return ndr_unpack(security.descriptor, desc)
def get_object_sid(self, object_dn):
res = self.ldb.search(object_dn)
return ndr_unpack(security.dom_sid, res[0]["objectSid"][0])
def dacl_add_ace(self, object_dn, ace):
""" Adds an ACE to an objects security descriptor
"""
desc = self.read_sd_on_dn(object_dn)
desc_sddl = desc.as_sddl(self.domain_sid)
if ace in desc_sddl:
return
if desc_sddl.find("(") >= 0:
desc_sddl = (desc_sddl[:desc_sddl.index("(")] + ace +
desc_sddl[desc_sddl.index("("):])
else:
desc_sddl = desc_sddl + ace
self.modify_sd_on_dn(object_dn, desc_sddl)
def get_sd_as_sddl(self, object_dn, controls=None):
""" Return object nTSecutiryDescriptor in SDDL format
"""
desc = self.read_sd_on_dn(object_dn, controls=controls)
return desc.as_sddl(self.domain_sid)
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