s4: update setntacl and getntacl to select the adaquate backend (fs/tdb) for storing...
[metze/samba/wip.git] / 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                 attribute = samba.xattr_tdb.wrap_getxattr(eadbname,file,xattr.XATTR_NTACL_NAME)
49                 try:
50                         attribute = samba.xattr_tdb.wrap_getxattr(eadbname,file,xattr.XATTR_NTACL_NAME)
51                 except:
52                         print "Fail to open %s"%eadbname
53                         attribute = samba.xattr_native.wrap_getxattr(file,xattr.XATTR_NTACL_NAME)
54         else:
55                 attribute = samba.xattr_native.wrap_getxattr(file,xattr.XATTR_NTACL_NAME)
56         ntacl = ndr_unpack(xattr.NTACL,attribute)
57         return ntacl
58
59 def setntacl(lp,file,sddl,domsid,backend=None,eadbfile=None):
60         try:
61                 checkset_backend(lp,backend,eadbfile)
62         except:
63                 raise
64         ntacl=xattr.NTACL()
65         ntacl.version = 1
66         anysid=security.dom_sid(domsid)
67         sd = security.descriptor.from_sddl(sddl, anysid)
68         ntacl.info = sd
69         eadbname = lp.get("posix:eadb")
70         if eadbname != None  and eadbname != "":
71                 try:
72                         attribute = samba.xattr_tdb.wrap_setxattr(eadbname,file,xattr.XATTR_NTACL_NAME,ndr_pack(ntacl))
73                 except:
74                         print "Fail to open %s"%eadbname
75                         attribute = samba.xattr_native.wrap_setxattr(file,xattr.XATTR_NTACL_NAME,ndr_pack(ntacl))
76         else:
77                 attribute = samba.xattr_native.wrap_setxattr(file,xattr.XATTR_NTACL_NAME,ndr_pack(ntacl))
78
79 # Takes the access mask of a DS ACE and transform them in a File ACE mask
80 def ldapmask2filemask(ldm):
81         RIGHT_DS_CREATE_CHILD     = 0x00000001
82         RIGHT_DS_DELETE_CHILD     = 0x00000002
83         RIGHT_DS_LIST_CONTENTS    = 0x00000004
84         ACTRL_DS_SELF             = 0x00000008
85         RIGHT_DS_READ_PROPERTY    = 0x00000010
86         RIGHT_DS_WRITE_PROPERTY   = 0x00000020
87         RIGHT_DS_DELETE_TREE      = 0x00000040
88         RIGHT_DS_LIST_OBJECT      = 0x00000080
89         RIGHT_DS_CONTROL_ACCESS   = 0x00000100
90         FILE_READ_DATA            = 0x0001
91         FILE_LIST_DIRECTORY       = 0x0001
92         FILE_WRITE_DATA           = 0x0002
93         FILE_ADD_FILE             = 0x0002
94         FILE_APPEND_DATA          = 0x0004
95         FILE_ADD_SUBDIRECTORY     = 0x0004
96         FILE_CREATE_PIPE_INSTANCE = 0x0004
97         FILE_READ_EA              = 0x0008
98         FILE_WRITE_EA             = 0x0010
99         FILE_EXECUTE              = 0x0020
100         FILE_TRAVERSE             = 0x0020
101         FILE_DELETE_CHILD         = 0x0040
102         FILE_READ_ATTRIBUTES      = 0x0080
103         FILE_WRITE_ATTRIBUTES     = 0x0100
104         DELETE                    = 0x00010000
105         READ_CONTROL              = 0x00020000
106         WRITE_DAC                 = 0x00040000
107         WRITE_OWNER               = 0x00080000
108         SYNCHRONIZE               = 0x00100000
109         STANDARD_RIGHTS_ALL       = 0x001F0000
110
111         filemask = ldm & STANDARD_RIGHTS_ALL
112         #filemask = 0
113
114         if( (ldm & RIGHT_DS_READ_PROPERTY) and (ldm & RIGHT_DS_LIST_CONTENTS) ):
115                 filemask = filemask | (SYNCHRONIZE | FILE_LIST_DIRECTORY |\
116                                                                 FILE_READ_ATTRIBUTES | FILE_READ_EA |\
117                                                                 FILE_READ_DATA | FILE_EXECUTE)
118
119         if( (ldm & RIGHT_DS_WRITE_PROPERTY) ):
120                 filemask = filemask | (SYNCHRONIZE | FILE_WRITE_DATA |\
121                                                                 FILE_APPEND_DATA | FILE_WRITE_EA |\
122                                                                 FILE_WRITE_ATTRIBUTES | FILE_ADD_FILE |\
123                                                                 FILE_ADD_SUBDIRECTORY)
124
125         if( (ldm & RIGHT_DS_CREATE_CHILD) ):
126                 filemask = filemask | (FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE)
127
128         if( (ldm & RIGHT_DS_DELETE_CHILD) ):
129                 filemask = filemask | FILE_DELETE_CHILD
130
131         return filemask
132
133 # This function takes an the SDDL representation of a DS
134 # ACL and return the SDDL representation of this ACL adapted
135 # for files. It's used for Policy object provision
136
137 def dsacl2fsacl(dssddl,domsid):
138         anysid = security.dom_sid(domsid)
139         ref = security.descriptor.from_sddl(dssddl,anysid)
140         fdescr = security.descriptor()
141         fdescr.owner_sid = ref.owner_sid
142         fdescr.group_sid = ref.group_sid
143         fdescr.type = ref.type
144         fdescr.revision = ref.revision
145         fdescr.sacl = ref.sacl
146         aces = ref.dacl.aces
147         for i in range(0,len(aces)):
148                 ace = aces[i]
149                 if not ace.type &  security.SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT and str(ace.trustee) != security.SID_BUILTIN_PREW2K:
150                 #       if fdescr.type & security.SEC_DESC_DACL_AUTO_INHERITED:
151                         ace.flags = ace.flags | security.SEC_ACE_FLAG_OBJECT_INHERIT | security.SEC_ACE_FLAG_CONTAINER_INHERIT
152                         if str(ace.trustee) == security.SID_CREATOR_OWNER:
153                                 # For Creator/Owner the IO flag is set as this ACE has only a sense for child objects
154                                 ace.flags = ace.flags | security.SEC_ACE_FLAG_INHERIT_ONLY
155                         ace.access_mask =  ldapmask2filemask(ace.access_mask)
156                         fdescr.dacl_add(ace)
157
158         return fdescr.as_sddl(anysid)