1 # Unix SMB/CIFS implementation.
2 # Copyright (C) Matthieu Patou <mat@matws.net> 2009-2010
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.
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.
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/>.
23 import samba.xattr_native, samba.xattr_tdb
24 from samba.dcerpc import security, xattr
25 from samba.ndr import ndr_pack, ndr_unpack
27 class XattrBackendError(Exception):
28 """A generic xattr backend error."""
31 def checkset_backend(lp, backend, eadbfile):
32 '''return the path to the eadb, or None'''
34 return lp.get("posix:eadb")
35 elif backend == "native":
37 elif backend == "tdb":
38 if eadbfile is not None:
41 return os.path.abspath(os.path.join(lp.get("private dir"), "eadb.tdb"))
43 raise XattrBackendError("Invalid xattr backend choice %s"%backend)
46 def getntacl(lp, file, backend=None, eadbfile=None):
47 eadbname = checkset_backend(lp, backend, eadbfile)
48 if eadbname is not None:
50 attribute = samba.xattr_tdb.wrap_getxattr(eadbname, file,
51 xattr.XATTR_NTACL_NAME)
53 # FIXME: Don't catch all exceptions, just those related to opening
55 print "Fail to open %s" % eadbname
56 attribute = samba.xattr_native.wrap_getxattr(file,
57 xattr.XATTR_NTACL_NAME)
59 attribute = samba.xattr_native.wrap_getxattr(file,
60 xattr.XATTR_NTACL_NAME)
61 ntacl = ndr_unpack(xattr.NTACL, attribute)
65 def setntacl(lp, file, sddl, domsid, backend=None, eadbfile=None):
66 eadbname = checkset_backend(lp, backend, eadbfile)
69 sid = security.dom_sid(domsid)
70 sd = security.descriptor.from_sddl(sddl, sid)
72 if eadbname is not None:
74 samba.xattr_tdb.wrap_setxattr(eadbname,
75 file, xattr.XATTR_NTACL_NAME, ndr_pack(ntacl))
77 # FIXME: Don't catch all exceptions, just those related to opening
79 print "Fail to open %s" % eadbname
80 samba.xattr_native.wrap_setxattr(file, xattr.XATTR_NTACL_NAME,
83 samba.xattr_native.wrap_setxattr(file, xattr.XATTR_NTACL_NAME,
87 def ldapmask2filemask(ldm):
88 """Takes the access mask of a DS ACE and transform them in a File ACE mask.
90 RIGHT_DS_CREATE_CHILD = 0x00000001
91 RIGHT_DS_DELETE_CHILD = 0x00000002
92 RIGHT_DS_LIST_CONTENTS = 0x00000004
93 ACTRL_DS_SELF = 0x00000008
94 RIGHT_DS_READ_PROPERTY = 0x00000010
95 RIGHT_DS_WRITE_PROPERTY = 0x00000020
96 RIGHT_DS_DELETE_TREE = 0x00000040
97 RIGHT_DS_LIST_OBJECT = 0x00000080
98 RIGHT_DS_CONTROL_ACCESS = 0x00000100
99 FILE_READ_DATA = 0x0001
100 FILE_LIST_DIRECTORY = 0x0001
101 FILE_WRITE_DATA = 0x0002
102 FILE_ADD_FILE = 0x0002
103 FILE_APPEND_DATA = 0x0004
104 FILE_ADD_SUBDIRECTORY = 0x0004
105 FILE_CREATE_PIPE_INSTANCE = 0x0004
106 FILE_READ_EA = 0x0008
107 FILE_WRITE_EA = 0x0010
108 FILE_EXECUTE = 0x0020
109 FILE_TRAVERSE = 0x0020
110 FILE_DELETE_CHILD = 0x0040
111 FILE_READ_ATTRIBUTES = 0x0080
112 FILE_WRITE_ATTRIBUTES = 0x0100
114 READ_CONTROL = 0x00020000
115 WRITE_DAC = 0x00040000
116 WRITE_OWNER = 0x00080000
117 SYNCHRONIZE = 0x00100000
118 STANDARD_RIGHTS_ALL = 0x001F0000
120 filemask = ldm & STANDARD_RIGHTS_ALL
122 if (ldm & RIGHT_DS_READ_PROPERTY) and (ldm & RIGHT_DS_LIST_CONTENTS):
123 filemask = filemask | (SYNCHRONIZE | FILE_LIST_DIRECTORY |\
124 FILE_READ_ATTRIBUTES | FILE_READ_EA |\
125 FILE_READ_DATA | FILE_EXECUTE)
127 if ldm & RIGHT_DS_WRITE_PROPERTY:
128 filemask = filemask | (SYNCHRONIZE | FILE_WRITE_DATA |\
129 FILE_APPEND_DATA | FILE_WRITE_EA |\
130 FILE_WRITE_ATTRIBUTES | FILE_ADD_FILE |\
131 FILE_ADD_SUBDIRECTORY)
133 if ldm & RIGHT_DS_CREATE_CHILD:
134 filemask = filemask | (FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE)
136 if ldm & RIGHT_DS_DELETE_CHILD:
137 filemask = filemask | FILE_DELETE_CHILD
142 def dsacl2fsacl(dssddl, domsid):
145 This function takes an the SDDL representation of a DS
146 ACL and return the SDDL representation of this ACL adapted
147 for files. It's used for Policy object provision
149 sid = security.dom_sid(domsid)
150 ref = security.descriptor.from_sddl(dssddl, sid)
151 fdescr = security.descriptor()
152 fdescr.owner_sid = ref.owner_sid
153 fdescr.group_sid = ref.group_sid
154 fdescr.type = ref.type
155 fdescr.revision = ref.revision
156 fdescr.sacl = ref.sacl
158 for i in range(0, len(aces)):
160 if not ace.type & security.SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT and str(ace.trustee) != security.SID_BUILTIN_PREW2K:
161 # if fdescr.type & security.SEC_DESC_DACL_AUTO_INHERITED:
162 ace.flags = ace.flags | security.SEC_ACE_FLAG_OBJECT_INHERIT | security.SEC_ACE_FLAG_CONTAINER_INHERIT
163 if str(ace.trustee) == security.SID_CREATOR_OWNER:
164 # For Creator/Owner the IO flag is set as this ACE has only a sense for child objects
165 ace.flags = ace.flags | security.SEC_ACE_FLAG_INHERIT_ONLY
166 ace.access_mask = ldapmask2filemask(ace.access_mask)
169 return fdescr.as_sddl(sid)