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":
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
)
62 def setntacl(lp
, file, sddl
, domsid
, backend
=None, eadbfile
=None):
63 checkset_backend(lp
, backend
, eadbfile
)
66 sid
= security
.dom_sid(domsid
)
67 sd
= security
.descriptor
.from_sddl(sddl
, sid
)
69 eadbname
= lp
.get("posix:eadb")
70 if eadbname
is not None and eadbname
!= "":
72 samba
.xattr_tdb
.wrap_setxattr(eadbname
,
73 file,xattr
.XATTR_NTACL_NAME
,ndr_pack(ntacl
))
75 # FIXME: Don't catch all exceptions, just those related to opening
77 print "Fail to open %s"%eadbname
78 samba
.xattr_native
.wrap_setxattr(file,xattr
.XATTR_NTACL_NAME
,ndr_pack(ntacl
))
80 samba
.xattr_native
.wrap_setxattr(file,xattr
.XATTR_NTACL_NAME
,ndr_pack(ntacl
))
82 def ldapmask2filemask(ldm
):
83 """Takes the access mask of a DS ACE and transform them in a File ACE mask"""
84 RIGHT_DS_CREATE_CHILD
= 0x00000001
85 RIGHT_DS_DELETE_CHILD
= 0x00000002
86 RIGHT_DS_LIST_CONTENTS
= 0x00000004
87 ACTRL_DS_SELF
= 0x00000008
88 RIGHT_DS_READ_PROPERTY
= 0x00000010
89 RIGHT_DS_WRITE_PROPERTY
= 0x00000020
90 RIGHT_DS_DELETE_TREE
= 0x00000040
91 RIGHT_DS_LIST_OBJECT
= 0x00000080
92 RIGHT_DS_CONTROL_ACCESS
= 0x00000100
93 FILE_READ_DATA
= 0x0001
94 FILE_LIST_DIRECTORY
= 0x0001
95 FILE_WRITE_DATA
= 0x0002
96 FILE_ADD_FILE
= 0x0002
97 FILE_APPEND_DATA
= 0x0004
98 FILE_ADD_SUBDIRECTORY
= 0x0004
99 FILE_CREATE_PIPE_INSTANCE
= 0x0004
100 FILE_READ_EA
= 0x0008
101 FILE_WRITE_EA
= 0x0010
102 FILE_EXECUTE
= 0x0020
103 FILE_TRAVERSE
= 0x0020
104 FILE_DELETE_CHILD
= 0x0040
105 FILE_READ_ATTRIBUTES
= 0x0080
106 FILE_WRITE_ATTRIBUTES
= 0x0100
108 READ_CONTROL
= 0x00020000
109 WRITE_DAC
= 0x00040000
110 WRITE_OWNER
= 0x00080000
111 SYNCHRONIZE
= 0x00100000
112 STANDARD_RIGHTS_ALL
= 0x001F0000
114 filemask
= ldm
& STANDARD_RIGHTS_ALL
116 if (ldm
& RIGHT_DS_READ_PROPERTY
) and (ldm
& RIGHT_DS_LIST_CONTENTS
):
117 filemask
= filemask |
(SYNCHRONIZE | FILE_LIST_DIRECTORY |\
118 FILE_READ_ATTRIBUTES | FILE_READ_EA |\
119 FILE_READ_DATA | FILE_EXECUTE
)
121 if ldm
& RIGHT_DS_WRITE_PROPERTY
:
122 filemask
= filemask |
(SYNCHRONIZE | FILE_WRITE_DATA |\
123 FILE_APPEND_DATA | FILE_WRITE_EA |\
124 FILE_WRITE_ATTRIBUTES | FILE_ADD_FILE |\
125 FILE_ADD_SUBDIRECTORY
)
127 if ldm
& RIGHT_DS_CREATE_CHILD
:
128 filemask
= filemask |
(FILE_ADD_SUBDIRECTORY | FILE_ADD_FILE
)
130 if ldm
& RIGHT_DS_DELETE_CHILD
:
131 filemask
= filemask | FILE_DELETE_CHILD
136 def dsacl2fsacl(dssddl
, domsid
):
139 This function takes an the SDDL representation of a DS
140 ACL and return the SDDL representation of this ACL adapted
141 for files. It's used for Policy object provision
143 sid
= security
.dom_sid(domsid
)
144 ref
= security
.descriptor
.from_sddl(dssddl
,sid
)
145 fdescr
= security
.descriptor()
146 fdescr
.owner_sid
= ref
.owner_sid
147 fdescr
.group_sid
= ref
.group_sid
148 fdescr
.type = ref
.type
149 fdescr
.revision
= ref
.revision
150 fdescr
.sacl
= ref
.sacl
152 for i
in range(0, len(aces
)):
154 if not ace
.type & security
.SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT
and str(ace
.trustee
) != security
.SID_BUILTIN_PREW2K
:
155 # if fdescr.type & security.SEC_DESC_DACL_AUTO_INHERITED:
156 ace
.flags
= ace
.flags | security
.SEC_ACE_FLAG_OBJECT_INHERIT | security
.SEC_ACE_FLAG_CONTAINER_INHERIT
157 if str(ace
.trustee
) == security
.SID_CREATOR_OWNER
:
158 # For Creator/Owner the IO flag is set as this ACE has only a sense for child objects
159 ace
.flags
= ace
.flags | security
.SEC_ACE_FLAG_INHERIT_ONLY
160 ace
.access_mask
= ldapmask2filemask(ace
.access_mask
)
163 return fdescr
.as_sddl(sid
)