source4/scripting/python/samba/netcmd/dsacl.py

   1 #!/usr/bin/env python
   2 #
   3 # Manipulate ACLs on directory objects
   4 #
   5 # Copyright (C) Nadezhda Ivanova <nivanova@samba.org> 2010
   6 # Copyright Giampaolo Lauria 2011 <lauria2@yahoo.com>
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 3 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21
  22 import samba.getopt as options
  23 from samba.dcerpc import security
  24 from samba.samdb import SamDB
  25 from samba.ndr import ndr_unpack, ndr_pack
  26 from samba.dcerpc.security import (
  27     GUID_DRS_ALLOCATE_RIDS, GUID_DRS_CHANGE_DOMAIN_MASTER,
  28     GUID_DRS_CHANGE_INFR_MASTER, GUID_DRS_CHANGE_PDC,
  29     GUID_DRS_CHANGE_RID_MASTER, GUID_DRS_CHANGE_SCHEMA_MASTER,
  30     GUID_DRS_GET_CHANGES, GUID_DRS_GET_ALL_CHANGES,
  31     GUID_DRS_GET_FILTERED_ATTRIBUTES, GUID_DRS_MANAGE_TOPOLOGY,
  32     GUID_DRS_MONITOR_TOPOLOGY, GUID_DRS_REPL_SYNCRONIZE,
  33     GUID_DRS_RO_REPL_SECRET_SYNC)
  34
  35
  36 import ldb
  37 from ldb import SCOPE_BASE
  38 import re
  39
  40 from samba.auth import system_session
  41 from samba.netcmd import (
  42     Command,
  43     CommandError,
  44     SuperCommand,
  45     Option,
  46     )
  47
  48
  49
  50 class cmd_dsacl_set(Command):
  51     """Modify access list on a directory object"""
  52
  53     synopsis = "%prog [options]"
  54     car_help = """ The access control right to allow or deny """
  55
  56     takes_options = [
  57         Option("-H", "--URL", help="LDB URL for database or target server",
  58                type=str, metavar="URL", dest="H"),
  59         Option("--car", type="choice", choices=["change-rid",
  60                                                 "change-pdc",
  61                                                 "change-infrastructure",
  62                                                 "change-schema",
  63                                                 "change-naming",
  64                                                 "allocate_rids",
  65                                                 "get-changes",
  66                                                 "get-changes-all",
  67                                                 "get-changes-filtered",
  68                                                 "topology-manage",
  69                                                 "topology-monitor",
  70                                                 "repl-sync",
  71                                                 "ro-repl-secret-sync"],
  72                help=car_help),
  73         Option("--action", type="choice", choices=["allow", "deny"],
  74                 help="""Deny or allow access"""),
  75         Option("--objectdn", help="DN of the object whose SD to modify",
  76             type="string"),
  77         Option("--trusteedn", help="DN of the entity that gets access",
  78             type="string"),
  79         Option("--sddl", help="An ACE or group of ACEs to be added on the object",
  80             type="string"),
  81         ]
  82
  83     def find_trustee_sid(self, samdb, trusteedn):
  84         res = samdb.search(base=trusteedn, expression="(objectClass=*)",
  85             scope=SCOPE_BASE)
  86         assert(len(res) == 1)
  87         return ndr_unpack( security.dom_sid,res[0]["objectSid"][0])
  88
  89     def modify_descriptor(self, samdb, object_dn, desc, controls=None):
  90         assert(isinstance(desc, security.descriptor))
  91         m = ldb.Message()
  92         m.dn = ldb.Dn(samdb, object_dn)
  93         m["nTSecurityDescriptor"]= ldb.MessageElement(
  94                 (ndr_pack(desc)), ldb.FLAG_MOD_REPLACE,
  95                 "nTSecurityDescriptor")
  96         samdb.modify(m)
  97
  98     def read_descriptor(self, samdb, object_dn):
  99         res = samdb.search(base=object_dn, scope=SCOPE_BASE,
 100                 attrs=["nTSecurityDescriptor"])
 101         # we should theoretically always have an SD
 102         assert(len(res) == 1)
 103         desc = res[0]["nTSecurityDescriptor"][0]
 104         return ndr_unpack(security.descriptor, desc)
 105
 106     def get_domain_sid(self, samdb):
 107         res = samdb.search(base=samdb.domain_dn(),
 108                 expression="(objectClass=*)", scope=SCOPE_BASE)
 109         return ndr_unpack( security.dom_sid,res[0]["objectSid"][0])
 110
 111     def add_ace(self, samdb, object_dn, new_ace):
 112         """Add new ace explicitly."""
 113         desc = self.read_descriptor(samdb, object_dn)
 114         desc_sddl = desc.as_sddl(self.get_domain_sid(samdb))
 115         #TODO add bindings for descriptor manipulation and get rid of this
 116         desc_aces = re.findall("\(.*?\)", desc_sddl)
 117         for ace in desc_aces:
 118             if ("ID" in ace):
 119                 desc_sddl = desc_sddl.replace(ace, "")
 120         if new_ace in desc_sddl:
 121             return
 122         if desc_sddl.find("(") >= 0:
 123             desc_sddl = desc_sddl[:desc_sddl.index("(")] + new_ace + desc_sddl[desc_sddl.index("("):]
 124         else:
 125             desc_sddl = desc_sddl + new_ace
 126         desc = security.descriptor.from_sddl(desc_sddl, self.get_domain_sid(samdb))
 127         self.modify_descriptor(samdb, object_dn, desc)
 128
 129     def print_new_acl(self, samdb, object_dn):
 130         desc = self.read_descriptor(samdb, object_dn)
 131         desc_sddl = desc.as_sddl(self.get_domain_sid(samdb))
 132         self.outf.write("new descriptor for %s:\n" % object_dn)
 133         self.outf.write(desc_sddl + "\n")
 134
 135     def run(self, car, action, objectdn, trusteedn, sddl,
 136             H=None, credopts=None, sambaopts=None, versionopts=None):
 137         lp = sambaopts.get_loadparm()
 138         creds = credopts.get_credentials(lp)
 139
 140         if sddl is None and (car is None or action is None
 141                              or objectdn is None or trusteedn is None):
 142             return self.usage()
 143
 144         samdb = SamDB(url=H, session_info=system_session(),
 145             credentials=creds, lp=lp)
 146         cars = {'change-rid' : GUID_DRS_CHANGE_RID_MASTER,
 147                 'change-pdc' : GUID_DRS_CHANGE_PDC,
 148                 'change-infrastructure' : GUID_DRS_CHANGE_INFR_MASTER,
 149                 'change-schema' : GUID_DRS_CHANGE_SCHEMA_MASTER,
 150                 'change-naming' : GUID_DRS_CHANGE_DOMAIN_MASTER,
 151                 'allocate_rids' : GUID_DRS_ALLOCATE_RIDS,
 152                 'get-changes' : GUID_DRS_GET_CHANGES,
 153                 'get-changes-all' : GUID_DRS_GET_ALL_CHANGES,
 154                 'get-changes-filtered' : GUID_DRS_GET_FILTERED_ATTRIBUTES,
 155                 'topology-manage' : GUID_DRS_MANAGE_TOPOLOGY,
 156                 'topology-monitor' : GUID_DRS_MONITOR_TOPOLOGY,
 157                 'repl-sync' : GUID_DRS_REPL_SYNCRONIZE,
 158                 'ro-repl-secret-sync' : GUID_DRS_RO_REPL_SECRET_SYNC,
 159                 }
 160         sid = self.find_trustee_sid(samdb, trusteedn)
 161         if sddl:
 162             new_ace = sddl
 163         elif action == "allow":
 164             new_ace = "(OA;;CR;%s;;%s)" % (cars[car], str(sid))
 165         elif action == "deny":
 166             new_ace = "(OD;;CR;%s;;%s)" % (cars[car], str(sid))
 167         else:
 168             raise CommandError("Wrong argument '%s'!" % action)
 169
 170         self.print_new_acl(samdb, objectdn)
 171         self.add_ace(samdb, objectdn, new_ace)
 172         self.print_new_acl(samdb, objectdn)
 173
 174
 175 class cmd_dsacl(SuperCommand):
 176     """DS ACLs manipulation"""
 177
 178     subcommands = {}
 179     subcommands["set"] = cmd_dsacl_set()