3 # Unix SMB/CIFS implementation.
4 # Copyright (C) Matthieu Patou <mat@matws.net> 2009-2010
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.
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.
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/>.
22 import samba.xattr_native, samba.xattr_tdb
23 from samba.dcerpc import security, xattr
24 from samba.ndr import ndr_pack, ndr_unpack
26 class XattrBackendError(Exception):
27 """A generic xattr backend error."""
29 def checkset_backend(lp,backend,eadbfile):
30 if backend is not None:
31 if backend == "native":
32 lp.set("posix:eadb","")
33 elif backend == "tdb":
35 lp.set("posix:eadb",eadbfile)
37 os.path.abspath(os.path.join(lp.get("private dir"),"eadb.tdb"))
39 raise XattrBackendError("Unvalid xattr backend choice %s"%backend)
41 def getntacl(lp, file, backend=None, eadbfile=None):
42 checkset_backend(lp, backend, eadbfile)
43 eadbname = lp.get("posix:eadb")
44 if eadbname is not None and eadbname != "":
46 attribute = samba.xattr_tdb.wrap_getxattr(eadbname, file,
47 xattr.XATTR_NTACL_NAME)
49 # FIXME: Don't catch all exceptions, just those related to opening
51 print "Fail to open %s" % eadbname
52 attribute = samba.xattr_native.wrap_getxattr(file,
53 xattr.XATTR_NTACL_NAME)
55 attribute = samba.xattr_native.wrap_getxattr(file,
56 xattr.XATTR_NTACL_NAME)
57 ntacl = ndr_unpack(xattr.NTACL,attribute)
60 def setntacl(lp, file, sddl, domsid, backend=None, eadbfile=None):
61 checkset_backend(lp, backend, eadbfile)
64 sid=security.dom_sid(domsid)
65 sd = security.descriptor.from_sddl(sddl, sid)
67 eadbname = lp.get("posix:eadb")
68 if eadbname is not None and eadbname != "":
70 samba.xattr_tdb.wrap_setxattr(eadbname,
71 file,xattr.XATTR_NTACL_NAME,ndr_pack(ntacl))
73 # FIXME: Don't catch all exceptions, just those related to opening
75 print "Fail to open %s"%eadbname
76 samba.xattr_native.wrap_setxattr(file,xattr.XATTR_NTACL_NAME,ndr_pack(ntacl))
78 samba.xattr_native.wrap_setxattr(file,xattr.XATTR_NTACL_NAME,ndr_pack(ntacl))
80 def ldapmask2filemask(ldm):
81 """Takes the access mask of a DS ACE and transform them in a File ACE mask"""
82 RIGHT_DS_CREATE_CHILD = 0x00000001
83 RIGHT_DS_DELETE_CHILD = 0x00000002
84 RIGHT_DS_LIST_CONTENTS = 0x00000004
85 ACTRL_DS_SELF = 0x00000008
86 RIGHT_DS_READ_PROPERTY = 0x00000010
87 RIGHT_DS_WRITE_PROPERTY = 0x00000020
88 RIGHT_DS_DELETE_TREE = 0x00000040
89 RIGHT_DS_LIST_OBJECT = 0x00000080
90 RIGHT_DS_CONTROL_ACCESS = 0x00000100
91 FILE_READ_DATA = 0x0001
92 FILE_LIST_DIRECTORY = 0x0001
93 FILE_WRITE_DATA = 0x0002
94 FILE_ADD_FILE = 0x0002
95 FILE_APPEND_DATA = 0x0004
96 FILE_ADD_SUBDIRECTORY = 0x0004
97 FILE_CREATE_PIPE_INSTANCE = 0x0004
99 FILE_WRITE_EA = 0x0010
100 FILE_EXECUTE = 0x0020
101 FILE_TRAVERSE = 0x0020
102 FILE_DELETE_CHILD = 0x0040
103 FILE_READ_ATTRIBUTES = 0x0080
104 FILE_WRITE_ATTRIBUTES = 0x0100
106 READ_CONTROL = 0x00020000
107 WRITE_DAC = 0x00040000
108 WRITE_OWNER = 0x00080000
109 SYNCHRONIZE = 0x00100000
110 STANDARD_RIGHTS_ALL = 0x001F0000
112 filemask = ldm & STANDARD_RIGHTS_ALL
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)
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)
125 if ldm & RIGHT_DS_CREATE_CHILD:
126 filemask = filemask | (FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE)
128 if ldm & RIGHT_DS_DELETE_CHILD:
129 filemask = filemask | FILE_DELETE_CHILD
133 def dsacl2fsacl(dssddl, domsid):
136 This function takes an the SDDL representation of a DS
137 ACL and return the SDDL representation of this ACL adapted
138 for files. It's used for Policy object provision
140 sid = security.dom_sid(domsid)
141 ref = security.descriptor.from_sddl(dssddl,sid)
142 fdescr = security.descriptor()
143 fdescr.owner_sid = ref.owner_sid
144 fdescr.group_sid = ref.group_sid
145 fdescr.type = ref.type
146 fdescr.revision = ref.revision
147 fdescr.sacl = ref.sacl
149 for i in range(0, len(aces)):
151 if not ace.type & security.SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT and str(ace.trustee) != security.SID_BUILTIN_PREW2K:
152 # if fdescr.type & security.SEC_DESC_DACL_AUTO_INHERITED:
153 ace.flags = ace.flags | security.SEC_ACE_FLAG_OBJECT_INHERIT | security.SEC_ACE_FLAG_CONTAINER_INHERIT
154 if str(ace.trustee) == security.SID_CREATOR_OWNER:
155 # For Creator/Owner the IO flag is set as this ACE has only a sense for child objects
156 ace.flags = ace.flags | security.SEC_ACE_FLAG_INHERIT_ONLY
157 ace.access_mask = ldapmask2filemask(ace.access_mask)
160 return fdescr.as_sddl(sid)