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# Manipulate ACLs on directory objects
#
# Copyright (C) Nadezhda Ivanova <nivanova@samba.org> 2010
#
# 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 samba.getopt as options
from samba.dcerpc import security
from samba.samdb import SamDB
from samba.ndr import ndr_unpack, ndr_pack
from samba.dcerpc.security import (
GUID_DRS_ALLOCATE_RIDS, GUID_DRS_CHANGE_DOMAIN_MASTER,
GUID_DRS_CHANGE_INFR_MASTER, GUID_DRS_CHANGE_PDC,
GUID_DRS_CHANGE_RID_MASTER, GUID_DRS_CHANGE_SCHEMA_MASTER,
GUID_DRS_GET_CHANGES, GUID_DRS_GET_ALL_CHANGES,
GUID_DRS_GET_FILTERED_ATTRIBUTES, GUID_DRS_MANAGE_TOPOLOGY,
GUID_DRS_MONITOR_TOPOLOGY, GUID_DRS_REPL_SYNCRONIZE,
GUID_DRS_RO_REPL_SECRET_SYNC)
import ldb
from ldb import SCOPE_BASE
import re
from samba.auth import system_session
from samba.netcmd import (
Command,
CommandError,
SuperCommand,
Option,
)
class cmd_dsacl_set(Command):
"""Modify access list on a directory object."""
synopsis = "%prog [options]"
car_help = """ The access control right to allow or deny """
takes_optiongroups = {
"sambaopts": options.SambaOptions,
"credopts": options.CredentialsOptions,
"versionopts": options.VersionOptions,
}
takes_options = [
Option("-H", "--URL", help="LDB URL for database or target server",
type=str, metavar="URL", dest="H"),
Option("--car", type="choice", choices=["change-rid",
"change-pdc",
"change-infrastructure",
"change-schema",
"change-naming",
"allocate_rids",
"get-changes",
"get-changes-all",
"get-changes-filtered",
"topology-manage",
"topology-monitor",
"repl-sync",
"ro-repl-secret-sync"],
help=car_help),
Option("--action", type="choice", choices=["allow", "deny"],
help="""Deny or allow access"""),
Option("--objectdn", help="DN of the object whose SD to modify",
type="string"),
Option("--trusteedn", help="DN of the entity that gets access",
type="string"),
Option("--sddl", help="An ACE or group of ACEs to be added on the object",
type="string"),
]
def find_trustee_sid(self, samdb, trusteedn):
res = samdb.search(base=trusteedn, expression="(objectClass=*)",
scope=SCOPE_BASE)
assert(len(res) == 1)
return ndr_unpack( security.dom_sid,res[0]["objectSid"][0])
def modify_descriptor(self, samdb, object_dn, desc, controls=None):
assert(isinstance(desc, security.descriptor))
m = ldb.Message()
m.dn = ldb.Dn(samdb, object_dn)
m["nTSecurityDescriptor"]= ldb.MessageElement(
(ndr_pack(desc)), ldb.FLAG_MOD_REPLACE,
"nTSecurityDescriptor")
samdb.modify(m)
def read_descriptor(self, samdb, object_dn):
res = samdb.search(base=object_dn, scope=SCOPE_BASE,
attrs=["nTSecurityDescriptor"])
# we should theoretically always have an SD
assert(len(res) == 1)
desc = res[0]["nTSecurityDescriptor"][0]
return ndr_unpack(security.descriptor, desc)
def get_domain_sid(self, samdb):
res = samdb.search(base=samdb.domain_dn(),
expression="(objectClass=*)", scope=SCOPE_BASE)
return ndr_unpack( security.dom_sid,res[0]["objectSid"][0])
def add_ace(self, samdb, object_dn, new_ace):
"""Add new ace explicitly."""
desc = self.read_descriptor(samdb, object_dn)
desc_sddl = desc.as_sddl(self.get_domain_sid(samdb))
#TODO add bindings for descriptor manipulation and get rid of this
desc_aces = re.findall("\(.*?\)", desc_sddl)
for ace in desc_aces:
if ("ID" in ace):
desc_sddl = desc_sddl.replace(ace, "")
if new_ace in desc_sddl:
return
if desc_sddl.find("(") >= 0:
desc_sddl = desc_sddl[:desc_sddl.index("(")] + new_ace + desc_sddl[desc_sddl.index("("):]
else:
desc_sddl = desc_sddl + new_ace
desc = security.descriptor.from_sddl(desc_sddl, self.get_domain_sid(samdb))
self.modify_descriptor(samdb, object_dn, desc)
def print_new_acl(self, samdb, object_dn):
desc = self.read_descriptor(samdb, object_dn)
desc_sddl = desc.as_sddl(self.get_domain_sid(samdb))
self.outf.write("new descriptor for %s:\n" % object_dn)
self.outf.write(desc_sddl + "\n")
def run(self, car, action, objectdn, trusteedn, sddl,
H=None, credopts=None, sambaopts=None, versionopts=None):
lp = sambaopts.get_loadparm()
creds = credopts.get_credentials(lp)
if sddl is None and (car is None or action is None
or objectdn is None or trusteedn is None):
return self.usage()
samdb = SamDB(url=H, session_info=system_session(),
credentials=creds, lp=lp)
cars = {'change-rid' : GUID_DRS_CHANGE_RID_MASTER,
'change-pdc' : GUID_DRS_CHANGE_PDC,
'change-infrastructure' : GUID_DRS_CHANGE_INFR_MASTER,
'change-schema' : GUID_DRS_CHANGE_SCHEMA_MASTER,
'change-naming' : GUID_DRS_CHANGE_DOMAIN_MASTER,
'allocate_rids' : GUID_DRS_ALLOCATE_RIDS,
'get-changes' : GUID_DRS_GET_CHANGES,
'get-changes-all' : GUID_DRS_GET_ALL_CHANGES,
'get-changes-filtered' : GUID_DRS_GET_FILTERED_ATTRIBUTES,
'topology-manage' : GUID_DRS_MANAGE_TOPOLOGY,
'topology-monitor' : GUID_DRS_MONITOR_TOPOLOGY,
'repl-sync' : GUID_DRS_REPL_SYNCRONIZE,
'ro-repl-secret-sync' : GUID_DRS_RO_REPL_SECRET_SYNC,
}
sid = self.find_trustee_sid(samdb, trusteedn)
if sddl:
new_ace = sddl
elif action == "allow":
new_ace = "(OA;;CR;%s;;%s)" % (cars[car], str(sid))
elif action == "deny":
new_ace = "(OD;;CR;%s;;%s)" % (cars[car], str(sid))
else:
raise CommandError("Wrong argument '%s'!" % action)
self.print_new_acl(samdb, objectdn)
self.add_ace(samdb, objectdn, new_ace)
self.print_new_acl(samdb, objectdn)
class cmd_dsacl(SuperCommand):
"""DS ACLs manipulation."""
subcommands = {}
subcommands["set"] = cmd_dsacl_set()
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