source4/scripting/python/samba/misc.py

   1 #!/usr/bin/python
   2
   3 # Unix SMB/CIFS implementation.
   4 # Copyright (C) Matthieu Patou <mat@matws.net> 2009
   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
  22 import samba.xattr
  23 from samba.dcerpc import security, xattr
  24 from samba.ndr import ndr_pack, ndr_unpack
  25
  26
  27 def getntacl(file):
  28         attribute = samba.xattr.wrap_getxattr(file,xattr.XATTR_NTACL_NAME)
  29         anysid=security.dom_sid(security.SID_NT_SELF)
  30         ntacl = ndr_unpack(xattr.NTACL,attribute,1)
  31         return ntacl.info.as_sddl(anysid)
  32
  33 def setntacl(file,sddl):
  34         ntacl=xattr.NTACL()
  35         ntacl.version = 1
  36         anysid=security.dom_sid(security.SID_NT_SELF)
  37         sd = security.descriptor.from_sddl(sddl, anysid)
  38         ntacl.info = sd
  39         attribute = samba.xattr.wrap_setxattr(file,xattr.XATTR_NTACL_NAME,ndr_pack(ntacl))
  40
  41 # Takes the access mask of a DS ACE and transform them in a File ACE mask
  42 def ldapmask2filemask(ldm):
  43         RIGHT_DS_CREATE_CHILD     = 0x00000001
  44         RIGHT_DS_DELETE_CHILD     = 0x00000002
  45         RIGHT_DS_LIST_CONTENTS    = 0x00000004
  46         ACTRL_DS_SELF             = 0x00000008
  47         RIGHT_DS_READ_PROPERTY    = 0x00000010
  48         RIGHT_DS_WRITE_PROPERTY   = 0x00000020
  49         RIGHT_DS_DELETE_TREE      = 0x00000040
  50         RIGHT_DS_LIST_OBJECT      = 0x00000080
  51         RIGHT_DS_CONTROL_ACCESS   = 0x00000100
  52         FILE_READ_DATA            = 0x0001
  53         FILE_LIST_DIRECTORY       = 0x0001
  54         FILE_WRITE_DATA           = 0x0002
  55         FILE_ADD_FILE             = 0x0002
  56         FILE_APPEND_DATA          = 0x0004
  57         FILE_ADD_SUBDIRECTORY     = 0x0004
  58         FILE_CREATE_PIPE_INSTANCE = 0x0004
  59         FILE_READ_EA              = 0x0008
  60         FILE_WRITE_EA             = 0x0010
  61         FILE_EXECUTE              = 0x0020
  62         FILE_TRAVERSE             = 0x0020
  63         FILE_DELETE_CHILD         = 0x0040
  64         FILE_READ_ATTRIBUTES      = 0x0080
  65         FILE_WRITE_ATTRIBUTES     = 0x0100
  66         DELETE                    = 0x00010000
  67         READ_CONTROL              = 0x00020000
  68         WRITE_DAC                 = 0x00040000
  69         WRITE_OWNER               = 0x00080000
  70         SYNCHRONIZE               = 0x00100000
  71         STANDARD_RIGHTS_ALL       = 0x001F0000
  72
  73         filemask = ldm & STANDARD_RIGHTS_ALL
  74         #filemask = 0
  75
  76         if( (ldm & RIGHT_DS_READ_PROPERTY) and (ldm & RIGHT_DS_LIST_CONTENTS) ):
  77                 filemask = filemask | (SYNCHRONIZE | FILE_LIST_DIRECTORY |\
  78                                                                 FILE_READ_ATTRIBUTES | FILE_READ_EA |\
  79                                                                 FILE_READ_DATA | FILE_EXECUTE)
  80
  81         if( (ldm & RIGHT_DS_WRITE_PROPERTY) ):
  82                 filemask = filemask | (SYNCHRONIZE | FILE_WRITE_DATA |\
  83                                                                 FILE_APPEND_DATA | FILE_WRITE_EA |\
  84                                                                 FILE_WRITE_ATTRIBUTES | FILE_ADD_FILE |\
  85                                                                 FILE_ADD_SUBDIRECTORY)
  86
  87         if( (ldm & RIGHT_DS_CREATE_CHILD) ):
  88                 filemask = filemask | (FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE)
  89
  90         if( (ldm & RIGHT_DS_DELETE_CHILD) ):
  91                 filemask = filemask | FILE_DELETE_CHILD
  92
  93         return filemask
  94
  95 # This function takes an the SDDL representation of a DS
  96 # ACL and return the SDDL representation of this ACL adapted
  97 # for files. It's used for Policy object provision
  98
  99 def dsacl2fsacl(dssddl):
 100         anysid = security.dom_sid(security.SID_NT_SELF)
 101         ref = security.descriptor.from_sddl(dssddl,anysid)
 102         fdescr = security.descriptor()
 103         fdescr.owner_sid = ref.owner_sid
 104         fdescr.group_sid = ref.group_sid
 105         fdescr.type = ref.type
 106         fdescr.revision = ref.revision
 107         fdescr.sacl = ref.sacl
 108         aces = ref.dacl.aces
 109         for i in range(0,len(aces)):
 110                 ace = aces[i]
 111                 if not ace.type &  security.SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT and str(ace.trustee) != security.SID_BUILTIN_PREW2K:
 112                 #       if fdescr.type & security.SEC_DESC_DACL_AUTO_INHERITED:
 113                         ace.flags = ace.flags | security.SEC_ACE_FLAG_OBJECT_INHERIT | security.SEC_ACE_FLAG_CONTAINER_INHERIT
 114                         if str(ace.trustee) == security.SID_CREATOR_OWNER:
 115                                 # For Creator/Owner the IO flag is set as this ACE has only a sense for child objects
 116                                 ace.flags = ace.flags | security.SEC_ACE_FLAG_INHERIT_ONLY
 117                         ace.access_mask =  ldapmask2filemask(ace.access_mask)
 118                         fdescr.dacl_add(ace)
 119
 120         return fdescr.as_sddl(anysid)