source4/scripting/python/samba/ntacls.py

   1 # Unix SMB/CIFS implementation.
   2 # Copyright (C) Matthieu Patou <mat@matws.net> 2009-2010
   3 #
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 #
  18
  19 """NT Acls."""
  20
  21
  22 import os
  23 import samba.xattr_native, samba.xattr_tdb, samba.posix_eadb
  24 from samba.dcerpc import security, xattr
  25 from samba.ndr import ndr_pack, ndr_unpack
  26 from samba.samba3 import smbd
  27
  28 class XattrBackendError(Exception):
  29     """A generic xattr backend error."""
  30
  31
  32 def checkset_backend(lp, backend, eadbfile):
  33     '''return the path to the eadb, or None'''
  34     if backend is None:
  35         xattr_tdb = lp.get("xattr_tdb:file")
  36         if xattr_tdb is not None:
  37             return (samba.xattr_tdb, lp.get("xattr_tdb:file"))
  38         posix_eadb = lp.get("posix:eadb")
  39         if posix_eadb is not None:
  40             return (samba.posix_eadb, lp.get("posix:eadb"))
  41         return (None, None)
  42     elif backend == "native":
  43         return (None, None)
  44     elif backend == "eadb":
  45         if eadbfile is not None:
  46             return (samba.posix_eadb, eadbfile)
  47         else:
  48             return (samba.posix_eadb, os.path.abspath(os.path.join(lp.get("private dir"), "eadb.tdb")))
  49     elif backend == "tdb":
  50         if eadbfile is not None:
  51             return (samba.xattr_tdb, eadbfile)
  52         else:
  53             return (samba.xattr_tdb, os.path.abspath(os.path.join(lp.get("state dir"), "xattr.tdb")))
  54     else:
  55         raise XattrBackendError("Invalid xattr backend choice %s"%backend)
  56
  57
  58 def getntacl(lp, file, backend=None, eadbfile=None):
  59     if use_ntvfs:
  60         (backend_obj, dbname) = checkset_backend(lp, backend, eadbfile)
  61         if dbname is not None:
  62             try:
  63                 attribute = backend_obj.wrap_getxattr(dbname, file,
  64                                                       xattr.XATTR_NTACL_NAME)
  65             except Exception:
  66                 # FIXME: Don't catch all exceptions, just those related to opening
  67                 # xattrdb
  68                 print "Fail to open %s" % dbname
  69                 attribute = samba.xattr_native.wrap_getxattr(file,
  70                                                              xattr.XATTR_NTACL_NAME)
  71         else:
  72             attribute = samba.xattr_native.wrap_getxattr(file,
  73                                                          xattr.XATTR_NTACL_NAME)
  74             ntacl = ndr_unpack(xattr.NTACL, attribute)
  75             return ntacl
  76     else:
  77         return smbd.get_nt_acl(file)
  78
  79
  80 def setntacl(lp, file, sddl, domsid, backend=None, eadbfile=None, use_ntvfs=True):
  81     sid = security.dom_sid(domsid)
  82     sd = security.descriptor.from_sddl(sddl, sid)
  83
  84     if use_ntvfs:
  85         (backend_obj, dbname) = checkset_backend(lp, backend, eadbfile)
  86         ntacl = xattr.NTACL()
  87         ntacl.version = 1
  88         ntacl.info = sd
  89         if dbname is not None:
  90             try:
  91                 backend_obj.wrap_setxattr(dbname,
  92                                           file, xattr.XATTR_NTACL_NAME, ndr_pack(ntacl))
  93             except Exception:
  94                 # FIXME: Don't catch all exceptions, just those related to opening
  95                 # xattrdb
  96                 print "Fail to open %s" % dbname
  97                 samba.xattr_native.wrap_setxattr(file, xattr.XATTR_NTACL_NAME,
  98                                                  ndr_pack(ntacl))
  99         else:
 100             samba.xattr_native.wrap_setxattr(file, xattr.XATTR_NTACL_NAME,
 101                                              ndr_pack(ntacl))
 102     else:
 103         smbd.set_nt_acl(file, security.SECINFO_OWNER | security.SECINFO_GROUP | security.SECINFO_DACL, sd)
 104
 105
 106 def ldapmask2filemask(ldm):
 107     """Takes the access mask of a DS ACE and transform them in a File ACE mask.
 108     """
 109     RIGHT_DS_CREATE_CHILD     = 0x00000001
 110     RIGHT_DS_DELETE_CHILD     = 0x00000002
 111     RIGHT_DS_LIST_CONTENTS    = 0x00000004
 112     ACTRL_DS_SELF             = 0x00000008
 113     RIGHT_DS_READ_PROPERTY    = 0x00000010
 114     RIGHT_DS_WRITE_PROPERTY   = 0x00000020
 115     RIGHT_DS_DELETE_TREE      = 0x00000040
 116     RIGHT_DS_LIST_OBJECT      = 0x00000080
 117     RIGHT_DS_CONTROL_ACCESS   = 0x00000100
 118     FILE_READ_DATA            = 0x0001
 119     FILE_LIST_DIRECTORY       = 0x0001
 120     FILE_WRITE_DATA           = 0x0002
 121     FILE_ADD_FILE             = 0x0002
 122     FILE_APPEND_DATA          = 0x0004
 123     FILE_ADD_SUBDIRECTORY     = 0x0004
 124     FILE_CREATE_PIPE_INSTANCE = 0x0004
 125     FILE_READ_EA              = 0x0008
 126     FILE_WRITE_EA             = 0x0010
 127     FILE_EXECUTE              = 0x0020
 128     FILE_TRAVERSE             = 0x0020
 129     FILE_DELETE_CHILD         = 0x0040
 130     FILE_READ_ATTRIBUTES      = 0x0080
 131     FILE_WRITE_ATTRIBUTES     = 0x0100
 132     DELETE                    = 0x00010000
 133     READ_CONTROL              = 0x00020000
 134     WRITE_DAC                 = 0x00040000
 135     WRITE_OWNER               = 0x00080000
 136     SYNCHRONIZE               = 0x00100000
 137     STANDARD_RIGHTS_ALL       = 0x001F0000
 138
 139     filemask = ldm & STANDARD_RIGHTS_ALL
 140
 141     if (ldm & RIGHT_DS_READ_PROPERTY) and (ldm & RIGHT_DS_LIST_CONTENTS):
 142         filemask = filemask | (SYNCHRONIZE | FILE_LIST_DIRECTORY |\
 143                                 FILE_READ_ATTRIBUTES | FILE_READ_EA |\
 144                                 FILE_READ_DATA | FILE_EXECUTE)
 145
 146     if ldm & RIGHT_DS_WRITE_PROPERTY:
 147         filemask = filemask | (SYNCHRONIZE | FILE_WRITE_DATA |\
 148                                 FILE_APPEND_DATA | FILE_WRITE_EA |\
 149                                 FILE_WRITE_ATTRIBUTES | FILE_ADD_FILE |\
 150                                 FILE_ADD_SUBDIRECTORY)
 151
 152     if ldm & RIGHT_DS_CREATE_CHILD:
 153         filemask = filemask | (FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE)
 154
 155     if ldm & RIGHT_DS_DELETE_CHILD:
 156         filemask = filemask | FILE_DELETE_CHILD
 157
 158     return filemask
 159
 160
 161 def dsacl2fsacl(dssddl, domsid):
 162     """
 163
 164     This function takes an the SDDL representation of a DS
 165     ACL and return the SDDL representation of this ACL adapted
 166     for files. It's used for Policy object provision
 167     """
 168     sid = security.dom_sid(domsid)
 169     ref = security.descriptor.from_sddl(dssddl, sid)
 170     fdescr = security.descriptor()
 171     fdescr.owner_sid = ref.owner_sid
 172     fdescr.group_sid = ref.group_sid
 173     fdescr.type = ref.type
 174     fdescr.revision = ref.revision
 175     fdescr.sacl = ref.sacl
 176     aces = ref.dacl.aces
 177     for i in range(0, len(aces)):
 178         ace = aces[i]
 179         if not ace.type & security.SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT and str(ace.trustee) != security.SID_BUILTIN_PREW2K:
 180        #    if fdescr.type & security.SEC_DESC_DACL_AUTO_INHERITED:
 181             ace.flags = ace.flags | security.SEC_ACE_FLAG_OBJECT_INHERIT | security.SEC_ACE_FLAG_CONTAINER_INHERIT
 182             if str(ace.trustee) == security.SID_CREATOR_OWNER:
 183                 # For Creator/Owner the IO flag is set as this ACE has only a sense for child objects
 184                 ace.flags = ace.flags | security.SEC_ACE_FLAG_INHERIT_ONLY
 185             ace.access_mask =  ldapmask2filemask(ace.access_mask)
 186             fdescr.dacl_add(ace)
 187
 188     return fdescr.as_sddl(sid)