Loading...
1/*
2 * Copyright (C) 2008 Christoph Hellwig.
3 * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "xfs.h"
20#include "xfs_format.h"
21#include "xfs_log_format.h"
22#include "xfs_trans_resv.h"
23#include "xfs_mount.h"
24#include "xfs_da_format.h"
25#include "xfs_inode.h"
26#include "xfs_attr.h"
27#include "xfs_attr_leaf.h"
28#include "xfs_acl.h"
29
30#include <linux/posix_acl_xattr.h>
31#include <linux/xattr.h>
32
33
34static int
35xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
36 struct inode *inode, const char *name, void *value, size_t size)
37{
38 int xflags = handler->flags;
39 struct xfs_inode *ip = XFS_I(inode);
40 int error, asize = size;
41
42 /* Convert Linux syscall to XFS internal ATTR flags */
43 if (!size) {
44 xflags |= ATTR_KERNOVAL;
45 value = NULL;
46 }
47
48 error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
49 if (error)
50 return error;
51 return asize;
52}
53
54void
55xfs_forget_acl(
56 struct inode *inode,
57 const char *name,
58 int xflags)
59{
60 /*
61 * Invalidate any cached ACLs if the user has bypassed the ACL
62 * interface. We don't validate the content whatsoever so it is caller
63 * responsibility to provide data in valid format and ensure i_mode is
64 * consistent.
65 */
66 if (xflags & ATTR_ROOT) {
67#ifdef CONFIG_XFS_POSIX_ACL
68 if (!strcmp(name, SGI_ACL_FILE))
69 forget_cached_acl(inode, ACL_TYPE_ACCESS);
70 else if (!strcmp(name, SGI_ACL_DEFAULT))
71 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
72#endif
73 }
74}
75
76static int
77xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused,
78 struct inode *inode, const char *name, const void *value,
79 size_t size, int flags)
80{
81 int xflags = handler->flags;
82 struct xfs_inode *ip = XFS_I(inode);
83 int error;
84
85 /* Convert Linux syscall to XFS internal ATTR flags */
86 if (flags & XATTR_CREATE)
87 xflags |= ATTR_CREATE;
88 if (flags & XATTR_REPLACE)
89 xflags |= ATTR_REPLACE;
90
91 if (!value)
92 return xfs_attr_remove(ip, (unsigned char *)name, xflags);
93 error = xfs_attr_set(ip, (unsigned char *)name,
94 (void *)value, size, xflags);
95 if (!error)
96 xfs_forget_acl(inode, name, xflags);
97
98 return error;
99}
100
101static const struct xattr_handler xfs_xattr_user_handler = {
102 .prefix = XATTR_USER_PREFIX,
103 .flags = 0, /* no flags implies user namespace */
104 .get = xfs_xattr_get,
105 .set = xfs_xattr_set,
106};
107
108static const struct xattr_handler xfs_xattr_trusted_handler = {
109 .prefix = XATTR_TRUSTED_PREFIX,
110 .flags = ATTR_ROOT,
111 .get = xfs_xattr_get,
112 .set = xfs_xattr_set,
113};
114
115static const struct xattr_handler xfs_xattr_security_handler = {
116 .prefix = XATTR_SECURITY_PREFIX,
117 .flags = ATTR_SECURE,
118 .get = xfs_xattr_get,
119 .set = xfs_xattr_set,
120};
121
122const struct xattr_handler *xfs_xattr_handlers[] = {
123 &xfs_xattr_user_handler,
124 &xfs_xattr_trusted_handler,
125 &xfs_xattr_security_handler,
126#ifdef CONFIG_XFS_POSIX_ACL
127 &posix_acl_access_xattr_handler,
128 &posix_acl_default_xattr_handler,
129#endif
130 NULL
131};
132
133static void
134__xfs_xattr_put_listent(
135 struct xfs_attr_list_context *context,
136 char *prefix,
137 int prefix_len,
138 unsigned char *name,
139 int namelen)
140{
141 char *offset;
142 int arraytop;
143
144 if (!context->alist)
145 goto compute_size;
146
147 arraytop = context->count + prefix_len + namelen + 1;
148 if (arraytop > context->firstu) {
149 context->count = -1; /* insufficient space */
150 context->seen_enough = 1;
151 return;
152 }
153 offset = (char *)context->alist + context->count;
154 strncpy(offset, prefix, prefix_len);
155 offset += prefix_len;
156 strncpy(offset, (char *)name, namelen); /* real name */
157 offset += namelen;
158 *offset = '\0';
159
160compute_size:
161 context->count += prefix_len + namelen + 1;
162 return;
163}
164
165static void
166xfs_xattr_put_listent(
167 struct xfs_attr_list_context *context,
168 int flags,
169 unsigned char *name,
170 int namelen,
171 int valuelen)
172{
173 char *prefix;
174 int prefix_len;
175
176 ASSERT(context->count >= 0);
177
178 if (flags & XFS_ATTR_ROOT) {
179#ifdef CONFIG_XFS_POSIX_ACL
180 if (namelen == SGI_ACL_FILE_SIZE &&
181 strncmp(name, SGI_ACL_FILE,
182 SGI_ACL_FILE_SIZE) == 0) {
183 __xfs_xattr_put_listent(
184 context, XATTR_SYSTEM_PREFIX,
185 XATTR_SYSTEM_PREFIX_LEN,
186 XATTR_POSIX_ACL_ACCESS,
187 strlen(XATTR_POSIX_ACL_ACCESS));
188 } else if (namelen == SGI_ACL_DEFAULT_SIZE &&
189 strncmp(name, SGI_ACL_DEFAULT,
190 SGI_ACL_DEFAULT_SIZE) == 0) {
191 __xfs_xattr_put_listent(
192 context, XATTR_SYSTEM_PREFIX,
193 XATTR_SYSTEM_PREFIX_LEN,
194 XATTR_POSIX_ACL_DEFAULT,
195 strlen(XATTR_POSIX_ACL_DEFAULT));
196 }
197#endif
198
199 /*
200 * Only show root namespace entries if we are actually allowed to
201 * see them.
202 */
203 if (!capable(CAP_SYS_ADMIN))
204 return;
205
206 prefix = XATTR_TRUSTED_PREFIX;
207 prefix_len = XATTR_TRUSTED_PREFIX_LEN;
208 } else if (flags & XFS_ATTR_SECURE) {
209 prefix = XATTR_SECURITY_PREFIX;
210 prefix_len = XATTR_SECURITY_PREFIX_LEN;
211 } else {
212 prefix = XATTR_USER_PREFIX;
213 prefix_len = XATTR_USER_PREFIX_LEN;
214 }
215
216 __xfs_xattr_put_listent(context, prefix, prefix_len, name,
217 namelen);
218 return;
219}
220
221ssize_t
222xfs_vn_listxattr(
223 struct dentry *dentry,
224 char *data,
225 size_t size)
226{
227 struct xfs_attr_list_context context;
228 struct attrlist_cursor_kern cursor = { 0 };
229 struct inode *inode = d_inode(dentry);
230 int error;
231
232 /*
233 * First read the regular on-disk attributes.
234 */
235 memset(&context, 0, sizeof(context));
236 context.dp = XFS_I(inode);
237 context.cursor = &cursor;
238 context.resynch = 1;
239 context.alist = size ? data : NULL;
240 context.bufsize = size;
241 context.firstu = context.bufsize;
242 context.put_listent = xfs_xattr_put_listent;
243
244 error = xfs_attr_list_int(&context);
245 if (error)
246 return error;
247 if (context.count < 0)
248 return -ERANGE;
249
250 return context.count;
251}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2008 Christoph Hellwig.
4 * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc.
5 */
6
7#include "xfs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_da_format.h"
12#include "xfs_inode.h"
13#include "xfs_attr.h"
14#include "xfs_acl.h"
15#include "xfs_da_btree.h"
16
17#include <linux/posix_acl_xattr.h>
18
19
20static int
21xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
22 struct inode *inode, const char *name, void *value, size_t size)
23{
24 struct xfs_da_args args = {
25 .dp = XFS_I(inode),
26 .attr_filter = handler->flags,
27 .name = name,
28 .namelen = strlen(name),
29 .value = value,
30 .valuelen = size,
31 };
32 int error;
33
34 error = xfs_attr_get(&args);
35 if (error)
36 return error;
37 return args.valuelen;
38}
39
40static int
41xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused,
42 struct inode *inode, const char *name, const void *value,
43 size_t size, int flags)
44{
45 struct xfs_da_args args = {
46 .dp = XFS_I(inode),
47 .attr_filter = handler->flags,
48 .attr_flags = flags,
49 .name = name,
50 .namelen = strlen(name),
51 .value = (void *)value,
52 .valuelen = size,
53 };
54 int error;
55
56 error = xfs_attr_set(&args);
57 if (!error && (handler->flags & XFS_ATTR_ROOT))
58 xfs_forget_acl(inode, name);
59 return error;
60}
61
62static const struct xattr_handler xfs_xattr_user_handler = {
63 .prefix = XATTR_USER_PREFIX,
64 .flags = 0, /* no flags implies user namespace */
65 .get = xfs_xattr_get,
66 .set = xfs_xattr_set,
67};
68
69static const struct xattr_handler xfs_xattr_trusted_handler = {
70 .prefix = XATTR_TRUSTED_PREFIX,
71 .flags = XFS_ATTR_ROOT,
72 .get = xfs_xattr_get,
73 .set = xfs_xattr_set,
74};
75
76static const struct xattr_handler xfs_xattr_security_handler = {
77 .prefix = XATTR_SECURITY_PREFIX,
78 .flags = XFS_ATTR_SECURE,
79 .get = xfs_xattr_get,
80 .set = xfs_xattr_set,
81};
82
83const struct xattr_handler *xfs_xattr_handlers[] = {
84 &xfs_xattr_user_handler,
85 &xfs_xattr_trusted_handler,
86 &xfs_xattr_security_handler,
87#ifdef CONFIG_XFS_POSIX_ACL
88 &posix_acl_access_xattr_handler,
89 &posix_acl_default_xattr_handler,
90#endif
91 NULL
92};
93
94static void
95__xfs_xattr_put_listent(
96 struct xfs_attr_list_context *context,
97 char *prefix,
98 int prefix_len,
99 unsigned char *name,
100 int namelen)
101{
102 char *offset;
103 int arraytop;
104
105 if (context->count < 0 || context->seen_enough)
106 return;
107
108 if (!context->buffer)
109 goto compute_size;
110
111 arraytop = context->count + prefix_len + namelen + 1;
112 if (arraytop > context->firstu) {
113 context->count = -1; /* insufficient space */
114 context->seen_enough = 1;
115 return;
116 }
117 offset = context->buffer + context->count;
118 strncpy(offset, prefix, prefix_len);
119 offset += prefix_len;
120 strncpy(offset, (char *)name, namelen); /* real name */
121 offset += namelen;
122 *offset = '\0';
123
124compute_size:
125 context->count += prefix_len + namelen + 1;
126 return;
127}
128
129static void
130xfs_xattr_put_listent(
131 struct xfs_attr_list_context *context,
132 int flags,
133 unsigned char *name,
134 int namelen,
135 int valuelen)
136{
137 char *prefix;
138 int prefix_len;
139
140 ASSERT(context->count >= 0);
141
142 if (flags & XFS_ATTR_ROOT) {
143#ifdef CONFIG_XFS_POSIX_ACL
144 if (namelen == SGI_ACL_FILE_SIZE &&
145 strncmp(name, SGI_ACL_FILE,
146 SGI_ACL_FILE_SIZE) == 0) {
147 __xfs_xattr_put_listent(
148 context, XATTR_SYSTEM_PREFIX,
149 XATTR_SYSTEM_PREFIX_LEN,
150 XATTR_POSIX_ACL_ACCESS,
151 strlen(XATTR_POSIX_ACL_ACCESS));
152 } else if (namelen == SGI_ACL_DEFAULT_SIZE &&
153 strncmp(name, SGI_ACL_DEFAULT,
154 SGI_ACL_DEFAULT_SIZE) == 0) {
155 __xfs_xattr_put_listent(
156 context, XATTR_SYSTEM_PREFIX,
157 XATTR_SYSTEM_PREFIX_LEN,
158 XATTR_POSIX_ACL_DEFAULT,
159 strlen(XATTR_POSIX_ACL_DEFAULT));
160 }
161#endif
162
163 /*
164 * Only show root namespace entries if we are actually allowed to
165 * see them.
166 */
167 if (!capable(CAP_SYS_ADMIN))
168 return;
169
170 prefix = XATTR_TRUSTED_PREFIX;
171 prefix_len = XATTR_TRUSTED_PREFIX_LEN;
172 } else if (flags & XFS_ATTR_SECURE) {
173 prefix = XATTR_SECURITY_PREFIX;
174 prefix_len = XATTR_SECURITY_PREFIX_LEN;
175 } else {
176 prefix = XATTR_USER_PREFIX;
177 prefix_len = XATTR_USER_PREFIX_LEN;
178 }
179
180 __xfs_xattr_put_listent(context, prefix, prefix_len, name,
181 namelen);
182 return;
183}
184
185ssize_t
186xfs_vn_listxattr(
187 struct dentry *dentry,
188 char *data,
189 size_t size)
190{
191 struct xfs_attr_list_context context;
192 struct inode *inode = d_inode(dentry);
193 int error;
194
195 /*
196 * First read the regular on-disk attributes.
197 */
198 memset(&context, 0, sizeof(context));
199 context.dp = XFS_I(inode);
200 context.resynch = 1;
201 context.buffer = size ? data : NULL;
202 context.bufsize = size;
203 context.firstu = context.bufsize;
204 context.put_listent = xfs_xattr_put_listent;
205
206 error = xfs_attr_list(&context);
207 if (error)
208 return error;
209 if (context.count < 0)
210 return -ERANGE;
211
212 return context.count;
213}