Line data Source code
1 : /*
2 : * Module to work around a bug in Linux XFS:
3 : * http://oss.sgi.com/bugzilla/show_bug.cgi?id=280
4 : *
5 : * Copyright (c) Volker Lendecke 2010
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 : #include "includes.h"
22 : #include "system/filesys.h"
23 : #include "smbd/smbd.h"
24 :
25 0 : static int linux_xfs_sgid_mkdirat(vfs_handle_struct *handle,
26 : struct files_struct *dirfsp,
27 : const struct smb_filename *smb_fname,
28 : mode_t mode)
29 : {
30 0 : struct smb_filename *dname = NULL;
31 0 : struct smb_filename *fname = NULL;
32 : int mkdir_res;
33 : int res;
34 : NTSTATUS status;
35 :
36 0 : DEBUG(10, ("Calling linux_xfs_sgid_mkdirat(%s)\n",
37 : smb_fname->base_name));
38 :
39 0 : mkdir_res = SMB_VFS_NEXT_MKDIRAT(handle,
40 : dirfsp,
41 : smb_fname,
42 : mode);
43 0 : if (mkdir_res == -1) {
44 0 : DEBUG(10, ("SMB_VFS_NEXT_MKDIRAT returned error: %s\n",
45 : strerror(errno)));
46 0 : return mkdir_res;
47 : }
48 :
49 0 : fname = full_path_from_dirfsp_atname(talloc_tos(),
50 : dirfsp,
51 : smb_fname);
52 0 : if (fname == NULL) {
53 0 : return -1;
54 : }
55 :
56 0 : status = SMB_VFS_PARENT_PATHNAME(handle->conn,
57 : talloc_tos(),
58 : fname,
59 : &dname,
60 : NULL);
61 0 : if (!NT_STATUS_IS_OK(status)) {
62 0 : DBG_WARNING("SMB_VFS_PARENT_PATHNAME() failed with %s\n",
63 : nt_errstr(status));
64 : /* return success, we did the mkdir */
65 0 : return mkdir_res;
66 : }
67 :
68 0 : res = SMB_VFS_NEXT_STAT(handle, dname);
69 0 : if (res == -1) {
70 0 : DBG_DEBUG("NEXT_STAT(%s) failed: %s\n",
71 : smb_fname_str_dbg(dname),
72 : strerror(errno));
73 : /* return success, we did the mkdir */
74 0 : return mkdir_res;
75 : }
76 0 : if ((dname->st.st_ex_mode & S_ISGID) == 0) {
77 : /* No SGID to inherit */
78 0 : DEBUG(10, ("No SGID to inherit\n"));
79 0 : TALLOC_FREE(dname);
80 0 : return mkdir_res;
81 : }
82 0 : TALLOC_FREE(dname);
83 :
84 0 : res = SMB_VFS_NEXT_STAT(handle, fname);
85 0 : if (res == -1) {
86 0 : DBG_NOTICE("Could not stat just created dir %s: %s\n",
87 : smb_fname_str_dbg(fname),
88 : strerror(errno));
89 : /* return success, we did the mkdir */
90 0 : TALLOC_FREE(fname);
91 0 : return mkdir_res;
92 : }
93 0 : fname->st.st_ex_mode |= S_ISGID;
94 0 : fname->st.st_ex_mode &= ~S_IFDIR;
95 :
96 : /*
97 : * Yes, we have to do this as root. If you do it as
98 : * non-privileged user, XFS on Linux will just ignore us and
99 : * return success. What can you do...
100 : */
101 0 : become_root();
102 0 : res = SMB_VFS_NEXT_FCHMOD(handle, smb_fname->fsp, fname->st.st_ex_mode);
103 0 : unbecome_root();
104 :
105 0 : if (res == -1) {
106 0 : DBG_NOTICE("CHMOD(%s, %o) failed: %s\n",
107 : smb_fname_str_dbg(fname),
108 : (int)fname->st.st_ex_mode,
109 : strerror(errno));
110 : /* return success, we did the mkdir */
111 0 : TALLOC_FREE(fname);
112 0 : return mkdir_res;
113 : }
114 :
115 0 : TALLOC_FREE(fname);
116 0 : return mkdir_res;
117 : }
118 :
119 : static struct vfs_fn_pointers linux_xfs_sgid_fns = {
120 : .mkdirat_fn = linux_xfs_sgid_mkdirat,
121 : };
122 :
123 : static_decl_vfs;
124 20 : NTSTATUS vfs_linux_xfs_sgid_init(TALLOC_CTX *ctx)
125 : {
126 20 : return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
127 : "linux_xfs_sgid", &linux_xfs_sgid_fns);
128 : }
|
