source: branches/samba-3.5.x/source3/modules/vfs_acl_xattr.c

Last change on this file was 599, checked in by Herwig Bauernfeind, 14 years ago

Samba 3.5: Update trunk to 3.5.9
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 "librpc/gen_ndr/xattr.h"
25#include "librpc/gen_ndr/ndr_xattr.h"
26#include "../lib/crypto/crypto.h"
27
28#undef DBGC_CLASS
29#define DBGC_CLASS DBGC_VFS
30
31/* Pull in the common functions. */
32#define ACL_MODULE_NAME "acl_xattr"
33
34#include "modules/vfs_acl_common.c"
35
36/*******************************************************************
37 Pull a security descriptor into a DATA_BLOB from a xattr.
38*******************************************************************/
39
40static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
41 vfs_handle_struct *handle,
42 files_struct *fsp,
43 const char *name,
44 DATA_BLOB *pblob)
45{
46 size_t size = 1024;
47 uint8_t *val = NULL;
48 uint8_t *tmp;
49 ssize_t sizeret;
50 int saved_errno = 0;
51
52 ZERO_STRUCTP(pblob);
53
54 again:
55
56 tmp = TALLOC_REALLOC_ARRAY(ctx, val, uint8_t, size);
57 if (tmp == NULL) {
58 TALLOC_FREE(val);
59 return NT_STATUS_NO_MEMORY;
60 }
61 val = tmp;
62
63 become_root();
64 if (fsp && fsp->fh->fd != -1) {
65 sizeret = SMB_VFS_FGETXATTR(fsp, XATTR_NTACL_NAME, val, size);
66 } else {
67 sizeret = SMB_VFS_GETXATTR(handle->conn, name,
68 XATTR_NTACL_NAME, val, size);
69 }
70 if (sizeret == -1) {
71 saved_errno = errno;
72 }
73 unbecome_root();
74
75 /* Max ACL size is 65536 bytes. */
76 if (sizeret == -1) {
77 errno = saved_errno;
78 if ((errno == ERANGE) && (size != 65536)) {
79 /* Too small, try again. */
80 size = 65536;
81 goto again;
82 }
83
84 /* Real error - exit here. */
85 TALLOC_FREE(val);
86 return map_nt_error_from_unix(errno);
87 }
88
89 pblob->data = val;
90 pblob->length = sizeret;
91 return NT_STATUS_OK;
92}
93
94/*******************************************************************
95 Store a DATA_BLOB into an xattr given an fsp pointer.
96*******************************************************************/
97
98static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
99 files_struct *fsp,
100 DATA_BLOB *pblob)
101{
102 int ret;
103 int saved_errno = 0;
104
105 DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
106 (unsigned int)pblob->length, fsp_str_dbg(fsp)));
107
108 become_root();
109 if (fsp->fh->fd != -1) {
110 ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
111 pblob->data, pblob->length, 0);
112 } else {
113 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
114 XATTR_NTACL_NAME,
115 pblob->data, pblob->length, 0);
116 }
117 if (ret) {
118 saved_errno = errno;
119 }
120 unbecome_root();
121 if (ret) {
122 errno = saved_errno;
123 DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
124 "with error %s\n",
125 fsp_str_dbg(fsp),
126 strerror(errno) ));
127 return map_nt_error_from_unix(errno);
128 }
129 return NT_STATUS_OK;
130}
131
132/*********************************************************************
133 Remove a Windows ACL - we're setting the underlying POSIX ACL.
134*********************************************************************/
135
136static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
137 const char *name,
138 SMB_ACL_TYPE_T type,
139 SMB_ACL_T theacl)
140{
141 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
142 name,
143 type,
144 theacl);
145 if (ret == -1) {
146 return -1;
147 }
148
149 become_root();
150 SMB_VFS_REMOVEXATTR(handle->conn, name, XATTR_NTACL_NAME);
151 unbecome_root();
152
153 return ret;
154}
155
156/*********************************************************************
157 Remove a Windows ACL - we're setting the underlying POSIX ACL.
158*********************************************************************/
159
160static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
161 files_struct *fsp,
162 SMB_ACL_T theacl)
163{
164 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
165 fsp,
166 theacl);
167 if (ret == -1) {
168 return -1;
169 }
170
171 become_root();
172 SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
173 unbecome_root();
174
175 return ret;
176}
177
178static int connect_acl_xattr(struct vfs_handle_struct *handle,
179 const char *service,
180 const char *user)
181{
182 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
183
184 if (ret < 0) {
185 return ret;
186 }
187
188 /* Ensure we have the parameters correct if we're
189 * using this module. */
190 DEBUG(2,("connect_acl_xattr: setting 'inherit acls = true' "
191 "'dos filemode = true' and "
192 "'force unknown acl user = true' for service %s\n",
193 service ));
194
195 lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
196 lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
197 lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
198
199 return 0;
200}
201
202static struct vfs_fn_pointers vfs_acl_xattr_fns = {
203 .connect_fn = connect_acl_xattr,
204 .opendir = opendir_acl_common,
205 .mkdir = mkdir_acl_common,
206 .rmdir = rmdir_acl_common,
207 .open = open_acl_common,
208 .create_file = create_file_acl_common,
209 .unlink = unlink_acl_common,
210 .chmod = chmod_acl_module_common,
211 .fchmod = fchmod_acl_module_common,
212 .fget_nt_acl = fget_nt_acl_common,
213 .get_nt_acl = get_nt_acl_common,
214 .fset_nt_acl = fset_nt_acl_common,
215 .chmod_acl = chmod_acl_acl_module_common,
216 .fchmod_acl = fchmod_acl_acl_module_common,
217 .sys_acl_set_file = sys_acl_set_file_xattr,
218 .sys_acl_set_fd = sys_acl_set_fd_xattr
219};
220
221NTSTATUS vfs_acl_xattr_init(void)
222{
223 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr",
224 &vfs_acl_xattr_fns);
225}
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