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, direct_db_access=True):
  59     if direct_db_access:
  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         if ntacl.version == 1:
  76             return ntacl.info
  77         elif ntacl.version == 2:
  78             return ntacl.info.sd
  79         elif ntacl.version == 3:
  80             return ntacl.info.sd
  81     else:
  82         return smbd.get_nt_acl(file, security.SECINFO_OWNER | security.SECINFO_GROUP | security.SECINFO_DACL | security.SECINFO_SACL)
  83
  84
  85 def setntacl(lp, file, sddl, domsid, backend=None, eadbfile=None, use_ntvfs=True):
  86     sid = security.dom_sid(domsid)
  87     sd = security.descriptor.from_sddl(sddl, sid)
  88
  89     if use_ntvfs:
  90         (backend_obj, dbname) = checkset_backend(lp, backend, eadbfile)
  91         ntacl = xattr.NTACL()
  92         ntacl.version = 1
  93         ntacl.info = sd
  94         if dbname is not None:
  95             try:
  96                 backend_obj.wrap_setxattr(dbname,
  97                                           file, xattr.XATTR_NTACL_NAME, ndr_pack(ntacl))
  98             except Exception:
  99                 # FIXME: Don't catch all exceptions, just those related to opening
 100                 # xattrdb
 101                 print "Fail to open %s" % dbname
 102                 samba.xattr_native.wrap_setxattr(file, xattr.XATTR_NTACL_NAME,
 103                                                  ndr_pack(ntacl))
 104         else:
 105             samba.xattr_native.wrap_setxattr(file, xattr.XATTR_NTACL_NAME,
 106                                              ndr_pack(ntacl))
 107     else:
 108         smbd.set_nt_acl(file, security.SECINFO_OWNER | security.SECINFO_GROUP | security.SECINFO_DACL, sd)
 109
 110
 111 def ldapmask2filemask(ldm):
 112     """Takes the access mask of a DS ACE and transform them in a File ACE mask.
 113     """
 114     RIGHT_DS_CREATE_CHILD     = 0x00000001
 115     RIGHT_DS_DELETE_CHILD     = 0x00000002
 116     RIGHT_DS_LIST_CONTENTS    = 0x00000004
 117     ACTRL_DS_SELF             = 0x00000008
 118     RIGHT_DS_READ_PROPERTY    = 0x00000010
 119     RIGHT_DS_WRITE_PROPERTY   = 0x00000020
 120     RIGHT_DS_DELETE_TREE      = 0x00000040
 121     RIGHT_DS_LIST_OBJECT      = 0x00000080
 122     RIGHT_DS_CONTROL_ACCESS   = 0x00000100
 123     FILE_READ_DATA            = 0x0001
 124     FILE_LIST_DIRECTORY       = 0x0001
 125     FILE_WRITE_DATA           = 0x0002
 126     FILE_ADD_FILE             = 0x0002
 127     FILE_APPEND_DATA          = 0x0004
 128     FILE_ADD_SUBDIRECTORY     = 0x0004
 129     FILE_CREATE_PIPE_INSTANCE = 0x0004
 130     FILE_READ_EA              = 0x0008
 131     FILE_WRITE_EA             = 0x0010
 132     FILE_EXECUTE              = 0x0020
 133     FILE_TRAVERSE             = 0x0020
 134     FILE_DELETE_CHILD         = 0x0040
 135     FILE_READ_ATTRIBUTES      = 0x0080
 136     FILE_WRITE_ATTRIBUTES     = 0x0100
 137     DELETE                    = 0x00010000
 138     READ_CONTROL              = 0x00020000
 139     WRITE_DAC                 = 0x00040000
 140     WRITE_OWNER               = 0x00080000
 141     SYNCHRONIZE               = 0x00100000
 142     STANDARD_RIGHTS_ALL       = 0x001F0000
 143
 144     filemask = ldm & STANDARD_RIGHTS_ALL
 145
 146     if (ldm & RIGHT_DS_READ_PROPERTY) and (ldm & RIGHT_DS_LIST_CONTENTS):
 147         filemask = filemask | (SYNCHRONIZE | FILE_LIST_DIRECTORY |\
 148                                 FILE_READ_ATTRIBUTES | FILE_READ_EA |\
 149                                 FILE_READ_DATA | FILE_EXECUTE)
 150
 151     if ldm & RIGHT_DS_WRITE_PROPERTY:
 152         filemask = filemask | (SYNCHRONIZE | FILE_WRITE_DATA |\
 153                                 FILE_APPEND_DATA | FILE_WRITE_EA |\
 154                                 FILE_WRITE_ATTRIBUTES | FILE_ADD_FILE |\
 155                                 FILE_ADD_SUBDIRECTORY)
 156
 157     if ldm & RIGHT_DS_CREATE_CHILD:
 158         filemask = filemask | (FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE)
 159
 160     if ldm & RIGHT_DS_DELETE_CHILD:
 161         filemask = filemask | FILE_DELETE_CHILD
 162
 163     return filemask
 164
 165
 166 def dsacl2fsacl(dssddl, domsid):
 167     """
 168
 169     This function takes an the SDDL representation of a DS
 170     ACL and return the SDDL representation of this ACL adapted
 171     for files. It's used for Policy object provision
 172     """
 173     sid = security.dom_sid(domsid)
 174     ref = security.descriptor.from_sddl(dssddl, sid)
 175     fdescr = security.descriptor()
 176     fdescr.owner_sid = ref.owner_sid
 177     fdescr.group_sid = ref.group_sid
 178     fdescr.type = ref.type
 179     fdescr.revision = ref.revision
 180     fdescr.sacl = ref.sacl
 181     aces = ref.dacl.aces
 182     for i in range(0, len(aces)):
 183         ace = aces[i]
 184         if not ace.type & security.SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT and str(ace.trustee) != security.SID_BUILTIN_PREW2K:
 185        #    if fdescr.type & security.SEC_DESC_DACL_AUTO_INHERITED:
 186             ace.flags = ace.flags | security.SEC_ACE_FLAG_OBJECT_INHERIT | security.SEC_ACE_FLAG_CONTAINER_INHERIT
 187             if str(ace.trustee) == security.SID_CREATOR_OWNER:
 188                 # For Creator/Owner the IO flag is set as this ACE has only a sense for child objects
 189                 ace.flags = ace.flags | security.SEC_ACE_FLAG_INHERIT_ONLY
 190             ace.access_mask =  ldapmask2filemask(ace.access_mask)
 191             fdescr.dacl_add(ace)
 192
 193     return fdescr.as_sddl(sid)