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f9e09f09 LM |
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" | |
a4fbe6ab | 20 | #include "xfs_format.h" |
69432832 | 21 | #include "xfs_log_format.h" |
239880ef | 22 | #include "xfs_trans_resv.h" |
57062787 DC |
23 | #include "xfs_mount.h" |
24 | #include "xfs_da_format.h" | |
f9e09f09 LM |
25 | #include "xfs_inode.h" |
26 | #include "xfs_attr.h" | |
27 | #include "xfs_attr_leaf.h" | |
28 | #include "xfs_acl.h" | |
f9e09f09 LM |
29 | |
30 | #include <linux/posix_acl_xattr.h> | |
31 | #include <linux/xattr.h> | |
32 | ||
33 | ||
f9e09f09 | 34 | static int |
d9a82a04 AG |
35 | xfs_xattr_get(const struct xattr_handler *handler, struct dentry *dentry, |
36 | const char *name, void *value, size_t size) | |
f9e09f09 | 37 | { |
d9a82a04 | 38 | int xflags = handler->flags; |
2b0143b5 | 39 | struct xfs_inode *ip = XFS_I(d_inode(dentry)); |
f9e09f09 LM |
40 | int error, asize = size; |
41 | ||
42 | if (strcmp(name, "") == 0) | |
43 | return -EINVAL; | |
44 | ||
45 | /* Convert Linux syscall to XFS internal ATTR flags */ | |
46 | if (!size) { | |
47 | xflags |= ATTR_KERNOVAL; | |
48 | value = NULL; | |
49 | } | |
50 | ||
2451337d | 51 | error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags); |
f9e09f09 LM |
52 | if (error) |
53 | return error; | |
54 | return asize; | |
55 | } | |
56 | ||
47e1bf64 AG |
57 | void |
58 | xfs_forget_acl( | |
59 | struct inode *inode, | |
60 | const char *name, | |
61 | int xflags) | |
62 | { | |
63 | /* | |
64 | * Invalidate any cached ACLs if the user has bypassed the ACL | |
65 | * interface. We don't validate the content whatsoever so it is caller | |
66 | * responsibility to provide data in valid format and ensure i_mode is | |
67 | * consistent. | |
68 | */ | |
69 | if (xflags & ATTR_ROOT) { | |
70 | #ifdef CONFIG_XFS_POSIX_ACL | |
71 | if (!strcmp(name, SGI_ACL_FILE)) | |
72 | forget_cached_acl(inode, ACL_TYPE_ACCESS); | |
73 | else if (!strcmp(name, SGI_ACL_DEFAULT)) | |
74 | forget_cached_acl(inode, ACL_TYPE_DEFAULT); | |
75 | #endif | |
76 | } | |
77 | } | |
78 | ||
f9e09f09 | 79 | static int |
d9a82a04 AG |
80 | xfs_xattr_set(const struct xattr_handler *handler, struct dentry *dentry, |
81 | const char *name, const void *value, size_t size, int flags) | |
f9e09f09 | 82 | { |
5d2eb548 | 83 | int xflags = handler->flags; |
67d8e04e BF |
84 | struct xfs_inode *ip = XFS_I(d_inode(dentry)); |
85 | int error; | |
f9e09f09 LM |
86 | |
87 | if (strcmp(name, "") == 0) | |
88 | return -EINVAL; | |
89 | ||
90 | /* Convert Linux syscall to XFS internal ATTR flags */ | |
91 | if (flags & XATTR_CREATE) | |
92 | xflags |= ATTR_CREATE; | |
93 | if (flags & XATTR_REPLACE) | |
94 | xflags |= ATTR_REPLACE; | |
95 | ||
96 | if (!value) | |
2451337d | 97 | return xfs_attr_remove(ip, (unsigned char *)name, xflags); |
67d8e04e | 98 | error = xfs_attr_set(ip, (unsigned char *)name, |
a9273ca5 | 99 | (void *)value, size, xflags); |
47e1bf64 AG |
100 | if (!error) |
101 | xfs_forget_acl(d_inode(dentry), name, xflags); | |
67d8e04e BF |
102 | |
103 | return error; | |
f9e09f09 LM |
104 | } |
105 | ||
46e58764 | 106 | static const struct xattr_handler xfs_xattr_user_handler = { |
f9e09f09 | 107 | .prefix = XATTR_USER_PREFIX, |
431547b3 CH |
108 | .flags = 0, /* no flags implies user namespace */ |
109 | .get = xfs_xattr_get, | |
110 | .set = xfs_xattr_set, | |
f9e09f09 LM |
111 | }; |
112 | ||
46e58764 | 113 | static const struct xattr_handler xfs_xattr_trusted_handler = { |
f9e09f09 | 114 | .prefix = XATTR_TRUSTED_PREFIX, |
431547b3 CH |
115 | .flags = ATTR_ROOT, |
116 | .get = xfs_xattr_get, | |
117 | .set = xfs_xattr_set, | |
f9e09f09 LM |
118 | }; |
119 | ||
46e58764 | 120 | static const struct xattr_handler xfs_xattr_security_handler = { |
f9e09f09 | 121 | .prefix = XATTR_SECURITY_PREFIX, |
431547b3 CH |
122 | .flags = ATTR_SECURE, |
123 | .get = xfs_xattr_get, | |
124 | .set = xfs_xattr_set, | |
f9e09f09 LM |
125 | }; |
126 | ||
46e58764 | 127 | const struct xattr_handler *xfs_xattr_handlers[] = { |
f9e09f09 LM |
128 | &xfs_xattr_user_handler, |
129 | &xfs_xattr_trusted_handler, | |
130 | &xfs_xattr_security_handler, | |
ef14f0c1 | 131 | #ifdef CONFIG_XFS_POSIX_ACL |
2401dc29 CH |
132 | &posix_acl_access_xattr_handler, |
133 | &posix_acl_default_xattr_handler, | |
ef14f0c1 | 134 | #endif |
f9e09f09 LM |
135 | NULL |
136 | }; | |
137 | ||
138 | static unsigned int xfs_xattr_prefix_len(int flags) | |
139 | { | |
140 | if (flags & XFS_ATTR_SECURE) | |
141 | return sizeof("security"); | |
142 | else if (flags & XFS_ATTR_ROOT) | |
143 | return sizeof("trusted"); | |
144 | else | |
145 | return sizeof("user"); | |
146 | } | |
147 | ||
148 | static const char *xfs_xattr_prefix(int flags) | |
149 | { | |
150 | if (flags & XFS_ATTR_SECURE) | |
151 | return xfs_xattr_security_handler.prefix; | |
152 | else if (flags & XFS_ATTR_ROOT) | |
153 | return xfs_xattr_trusted_handler.prefix; | |
154 | else | |
155 | return xfs_xattr_user_handler.prefix; | |
156 | } | |
157 | ||
158 | static int | |
a9273ca5 DC |
159 | xfs_xattr_put_listent( |
160 | struct xfs_attr_list_context *context, | |
161 | int flags, | |
162 | unsigned char *name, | |
163 | int namelen, | |
164 | int valuelen, | |
165 | unsigned char *value) | |
f9e09f09 LM |
166 | { |
167 | unsigned int prefix_len = xfs_xattr_prefix_len(flags); | |
168 | char *offset; | |
169 | int arraytop; | |
170 | ||
171 | ASSERT(context->count >= 0); | |
172 | ||
173 | /* | |
174 | * Only show root namespace entries if we are actually allowed to | |
175 | * see them. | |
176 | */ | |
177 | if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN)) | |
178 | return 0; | |
179 | ||
180 | arraytop = context->count + prefix_len + namelen + 1; | |
181 | if (arraytop > context->firstu) { | |
182 | context->count = -1; /* insufficient space */ | |
183 | return 1; | |
184 | } | |
185 | offset = (char *)context->alist + context->count; | |
186 | strncpy(offset, xfs_xattr_prefix(flags), prefix_len); | |
187 | offset += prefix_len; | |
a9273ca5 | 188 | strncpy(offset, (char *)name, namelen); /* real name */ |
f9e09f09 LM |
189 | offset += namelen; |
190 | *offset = '\0'; | |
191 | context->count += prefix_len + namelen + 1; | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static int | |
a9273ca5 DC |
196 | xfs_xattr_put_listent_sizes( |
197 | struct xfs_attr_list_context *context, | |
198 | int flags, | |
199 | unsigned char *name, | |
200 | int namelen, | |
201 | int valuelen, | |
202 | unsigned char *value) | |
f9e09f09 LM |
203 | { |
204 | context->count += xfs_xattr_prefix_len(flags) + namelen + 1; | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static int | |
209 | list_one_attr(const char *name, const size_t len, void *data, | |
210 | size_t size, ssize_t *result) | |
211 | { | |
212 | char *p = data + *result; | |
213 | ||
214 | *result += len; | |
215 | if (!size) | |
216 | return 0; | |
217 | if (*result > size) | |
218 | return -ERANGE; | |
219 | ||
220 | strcpy(p, name); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | ssize_t | |
225 | xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size) | |
226 | { | |
227 | struct xfs_attr_list_context context; | |
228 | struct attrlist_cursor_kern cursor = { 0 }; | |
2b0143b5 | 229 | struct inode *inode = d_inode(dentry); |
f9e09f09 LM |
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 = data; | |
240 | context.bufsize = size; | |
241 | context.firstu = context.bufsize; | |
242 | ||
243 | if (size) | |
244 | context.put_listent = xfs_xattr_put_listent; | |
245 | else | |
246 | context.put_listent = xfs_xattr_put_listent_sizes; | |
247 | ||
248 | xfs_attr_list_int(&context); | |
249 | if (context.count < 0) | |
250 | return -ERANGE; | |
251 | ||
252 | /* | |
253 | * Then add the two synthetic ACL attributes. | |
254 | */ | |
ef14f0c1 | 255 | if (posix_acl_access_exists(inode)) { |
f9e09f09 LM |
256 | error = list_one_attr(POSIX_ACL_XATTR_ACCESS, |
257 | strlen(POSIX_ACL_XATTR_ACCESS) + 1, | |
258 | data, size, &context.count); | |
259 | if (error) | |
260 | return error; | |
261 | } | |
262 | ||
ef14f0c1 | 263 | if (posix_acl_default_exists(inode)) { |
f9e09f09 LM |
264 | error = list_one_attr(POSIX_ACL_XATTR_DEFAULT, |
265 | strlen(POSIX_ACL_XATTR_DEFAULT) + 1, | |
266 | data, size, &context.count); | |
267 | if (error) | |
268 | return error; | |
269 | } | |
270 | ||
271 | return context.count; | |
272 | } |