source: vendor/current/source3/modules/vfs_acl_xattr.c@ 740

Last change on this file since 740 was 740, checked in by Silvan Scherrer, 13 years ago

Samba Server: update vendor to 3.6.0
File size: 6.2 KB
Line 
1/*
2 * Store Windows ACLs in xattrs.
3 *
4 * Copyright (C) Volker Lendecke, 2008
5 * Copyright (C) Jeremy Allison, 2008
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/* NOTE: This is an experimental module, not yet finished. JRA. */
22
23#include "includes.h"
24#include "smbd/smbd.h"
25#include "librpc/gen_ndr/xattr.h"
26#include "librpc/gen_ndr/ndr_xattr.h"
27#include "../lib/crypto/crypto.h"
28#include "auth.h"
29
30#undef DBGC_CLASS
31#define DBGC_CLASS DBGC_VFS
32
33/* Pull in the common functions. */
34#define ACL_MODULE_NAME "acl_xattr"
35
36#include "modules/vfs_acl_common.c"
37
38/*******************************************************************
39 Pull a security descriptor into a DATA_BLOB from a xattr.
40*******************************************************************/
41
42static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
43 vfs_handle_struct *handle,
44 files_struct *fsp,
45 const char *name,
46 DATA_BLOB *pblob)
47{
48 size_t size = 1024;
49 uint8_t *val = NULL;
50 uint8_t *tmp;
51 ssize_t sizeret;
52 int saved_errno = 0;
53
54 ZERO_STRUCTP(pblob);
55
56 again:
57
58 tmp = TALLOC_REALLOC_ARRAY(ctx, val, uint8_t, size);
59 if (tmp == NULL) {
60 TALLOC_FREE(val);
61 return NT_STATUS_NO_MEMORY;
62 }
63 val = tmp;
64
65 become_root();
66 if (fsp && fsp->fh->fd != -1) {
67 sizeret = SMB_VFS_FGETXATTR(fsp, XATTR_NTACL_NAME, val, size);
68 } else {
69 sizeret = SMB_VFS_GETXATTR(handle->conn, name,
70 XATTR_NTACL_NAME, val, size);
71 }
72 if (sizeret == -1) {
73 saved_errno = errno;
74 }
75 unbecome_root();
76
77 /* Max ACL size is 65536 bytes. */
78 if (sizeret == -1) {
79 errno = saved_errno;
80 if ((errno == ERANGE) && (size != 65536)) {
81 /* Too small, try again. */
82 size = 65536;
83 goto again;
84 }
85
86 /* Real error - exit here. */
87 TALLOC_FREE(val);
88 return map_nt_error_from_unix(errno);
89 }
90
91 pblob->data = val;
92 pblob->length = sizeret;
93 return NT_STATUS_OK;
94}
95
96/*******************************************************************
97 Store a DATA_BLOB into an xattr given an fsp pointer.
98*******************************************************************/
99
100static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
101 files_struct *fsp,
102 DATA_BLOB *pblob)
103{
104 int ret;
105 int saved_errno = 0;
106
107 DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
108 (unsigned int)pblob->length, fsp_str_dbg(fsp)));
109
110 become_root();
111 if (fsp->fh->fd != -1) {
112 ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
113 pblob->data, pblob->length, 0);
114 } else {
115 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
116 XATTR_NTACL_NAME,
117 pblob->data, pblob->length, 0);
118 }
119 if (ret) {
120 saved_errno = errno;
121 }
122 unbecome_root();
123 if (ret) {
124 errno = saved_errno;
125 DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
126 "with error %s\n",
127 fsp_str_dbg(fsp),
128 strerror(errno) ));
129 return map_nt_error_from_unix(errno);
130 }
131 return NT_STATUS_OK;
132}
133
134/*********************************************************************
135 Remove a Windows ACL - we're setting the underlying POSIX ACL.
136*********************************************************************/
137
138static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
139 const char *name,
140 SMB_ACL_TYPE_T type,
141 SMB_ACL_T theacl)
142{
143 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
144 name,
145 type,
146 theacl);
147 if (ret == -1) {
148 return -1;
149 }
150
151 become_root();
152 SMB_VFS_REMOVEXATTR(handle->conn, name, XATTR_NTACL_NAME);
153 unbecome_root();
154
155 return ret;
156}
157
158/*********************************************************************
159 Remove a Windows ACL - we're setting the underlying POSIX ACL.
160*********************************************************************/
161
162static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
163 files_struct *fsp,
164 SMB_ACL_T theacl)
165{
166 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
167 fsp,
168 theacl);
169 if (ret == -1) {
170 return -1;
171 }
172
173 become_root();
174 SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
175 unbecome_root();
176
177 return ret;
178}
179
180static int connect_acl_xattr(struct vfs_handle_struct *handle,
181 const char *service,
182 const char *user)
183{
184 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
185
186 if (ret < 0) {
187 return ret;
188 }
189
190 /* Ensure we have the parameters correct if we're
191 * using this module. */
192 DEBUG(2,("connect_acl_xattr: setting 'inherit acls = true' "
193 "'dos filemode = true' and "
194 "'force unknown acl user = true' for service %s\n",
195 service ));
196
197 lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
198 lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
199 lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
200
201 return 0;
202}
203
204static struct vfs_fn_pointers vfs_acl_xattr_fns = {
205 .connect_fn = connect_acl_xattr,
206 .opendir = opendir_acl_common,
207 .mkdir = mkdir_acl_common,
208 .rmdir = rmdir_acl_common,
209 .open_fn = open_acl_common,
210 .create_file = create_file_acl_common,
211 .unlink = unlink_acl_common,
212 .chmod = chmod_acl_module_common,
213 .fchmod = fchmod_acl_module_common,
214 .fget_nt_acl = fget_nt_acl_common,
215 .get_nt_acl = get_nt_acl_common,
216 .fset_nt_acl = fset_nt_acl_common,
217 .chmod_acl = chmod_acl_acl_module_common,
218 .fchmod_acl = fchmod_acl_acl_module_common,
219 .sys_acl_set_file = sys_acl_set_file_xattr,
220 .sys_acl_set_fd = sys_acl_set_fd_xattr
221};
222
223NTSTATUS vfs_acl_xattr_init(void)
224{
225 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr",
226 &vfs_acl_xattr_fns);
227}
Note: See TracBrowser for help on using the repository browser.