source4/scripting/python/samba/ntacls.py

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