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."""
30 def checkset_backend(lp, backend, eadbfile):
31 if backend is not None:
32 if backend == "native":
33 lp.set("posix:eadb", "")
34 elif backend == "tdb":
35 if eadbfile is not None:
36 lp.set("posix:eadb", eadbfile)
38 os.path.abspath(os.path.join(lp.get("private dir"), "eadb.tdb"))
40 raise XattrBackendError("Invalid xattr backend choice %s"%backend)
43 def getntacl(lp, file, backend=None, eadbfile=None):
44 checkset_backend(lp, backend, eadbfile)
45 eadbname = lp.get("posix:eadb")
46 if eadbname is not None and eadbname != "":
48 attribute = samba.xattr_tdb.wrap_getxattr(eadbname, file,
49 xattr.XATTR_NTACL_NAME)
51 # FIXME: Don't catch all exceptions, just those related to opening
53 print "Fail to open %s" % eadbname
54 attribute = samba.xattr_native.wrap_getxattr(file,
55 xattr.XATTR_NTACL_NAME)
57 attribute = samba.xattr_native.wrap_getxattr(file,
58 xattr.XATTR_NTACL_NAME)
59 ntacl = ndr_unpack(xattr.NTACL, attribute)
63 def setntacl(lp, file, sddl, domsid, backend=None, eadbfile=None):
64 checkset_backend(lp, backend, eadbfile)
67 sid = security.dom_sid(domsid)
68 sd = security.descriptor.from_sddl(sddl, sid)
70 eadbname = lp.get("posix:eadb")
71 if eadbname is not None and eadbname != "":
73 samba.xattr_tdb.wrap_setxattr(eadbname,
74 file, xattr.XATTR_NTACL_NAME, ndr_pack(ntacl))
76 # FIXME: Don't catch all exceptions, just those related to opening
78 print "Fail to open %s" % eadbname
79 samba.xattr_native.wrap_setxattr(file, xattr.XATTR_NTACL_NAME,
82 samba.xattr_native.wrap_setxattr(file, xattr.XATTR_NTACL_NAME,
86 def ldapmask2filemask(ldm):
87 """Takes the access mask of a DS ACE and transform them in a File ACE mask.
89 RIGHT_DS_CREATE_CHILD = 0x00000001
90 RIGHT_DS_DELETE_CHILD = 0x00000002
91 RIGHT_DS_LIST_CONTENTS = 0x00000004
92 ACTRL_DS_SELF = 0x00000008
93 RIGHT_DS_READ_PROPERTY = 0x00000010
94 RIGHT_DS_WRITE_PROPERTY = 0x00000020
95 RIGHT_DS_DELETE_TREE = 0x00000040
96 RIGHT_DS_LIST_OBJECT = 0x00000080
97 RIGHT_DS_CONTROL_ACCESS = 0x00000100
98 FILE_READ_DATA = 0x0001
99 FILE_LIST_DIRECTORY = 0x0001
100 FILE_WRITE_DATA = 0x0002
101 FILE_ADD_FILE = 0x0002
102 FILE_APPEND_DATA = 0x0004
103 FILE_ADD_SUBDIRECTORY = 0x0004
104 FILE_CREATE_PIPE_INSTANCE = 0x0004
105 FILE_READ_EA = 0x0008
106 FILE_WRITE_EA = 0x0010
107 FILE_EXECUTE = 0x0020
108 FILE_TRAVERSE = 0x0020
109 FILE_DELETE_CHILD = 0x0040
110 FILE_READ_ATTRIBUTES = 0x0080
111 FILE_WRITE_ATTRIBUTES = 0x0100
113 READ_CONTROL = 0x00020000
114 WRITE_DAC = 0x00040000
115 WRITE_OWNER = 0x00080000
116 SYNCHRONIZE = 0x00100000
117 STANDARD_RIGHTS_ALL = 0x001F0000
119 filemask = ldm & STANDARD_RIGHTS_ALL
121 if (ldm & RIGHT_DS_READ_PROPERTY) and (ldm & RIGHT_DS_LIST_CONTENTS):
122 filemask = filemask | (SYNCHRONIZE | FILE_LIST_DIRECTORY |\
123 FILE_READ_ATTRIBUTES | FILE_READ_EA |\
124 FILE_READ_DATA | FILE_EXECUTE)
126 if ldm & RIGHT_DS_WRITE_PROPERTY:
127 filemask = filemask | (SYNCHRONIZE | FILE_WRITE_DATA |\
128 FILE_APPEND_DATA | FILE_WRITE_EA |\
129 FILE_WRITE_ATTRIBUTES | FILE_ADD_FILE |\
130 FILE_ADD_SUBDIRECTORY)
132 if ldm & RIGHT_DS_CREATE_CHILD:
133 filemask = filemask | (FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE)
135 if ldm & RIGHT_DS_DELETE_CHILD:
136 filemask = filemask | FILE_DELETE_CHILD
141 def dsacl2fsacl(dssddl, domsid):
144 This function takes an the SDDL representation of a DS
145 ACL and return the SDDL representation of this ACL adapted
146 for files. It's used for Policy object provision
148 sid = security.dom_sid(domsid)
149 ref = security.descriptor.from_sddl(dssddl, sid)
150 fdescr = security.descriptor()
151 fdescr.owner_sid = ref.owner_sid
152 fdescr.group_sid = ref.group_sid
153 fdescr.type = ref.type
154 fdescr.revision = ref.revision
155 fdescr.sacl = ref.sacl
157 for i in range(0, len(aces)):
159 if not ace.type & security.SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT and str(ace.trustee) != security.SID_BUILTIN_PREW2K:
160 # if fdescr.type & security.SEC_DESC_DACL_AUTO_INHERITED:
161 ace.flags = ace.flags | security.SEC_ACE_FLAG_OBJECT_INHERIT | security.SEC_ACE_FLAG_CONTAINER_INHERIT
162 if str(ace.trustee) == security.SID_CREATOR_OWNER:
163 # For Creator/Owner the IO flag is set as this ACE has only a sense for child objects
164 ace.flags = ace.flags | security.SEC_ACE_FLAG_INHERIT_ONLY
165 ace.access_mask = ldapmask2filemask(ace.access_mask)
168 return fdescr.as_sddl(sid)