Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/nfs/idmap.c | |
3 | * | |
4 | * UID and GID to name mapping for clients. | |
5 | * | |
6 | * Copyright (c) 2002 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Marius Aamodt Eriksen <marius@umich.edu> | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * 2. Redistributions in binary form must reproduce the above copyright | |
18 | * notice, this list of conditions and the following disclaimer in the | |
19 | * documentation and/or other materials provided with the distribution. | |
20 | * 3. Neither the name of the University nor the names of its | |
21 | * contributors may be used to endorse or promote products derived | |
22 | * from this software without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
27 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
31 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
32 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
33 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
34 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
5cf36cfd | 36 | #include <linux/types.h> |
57e62324 BS |
37 | #include <linux/parser.h> |
38 | #include <linux/fs.h> | |
e44ba033 | 39 | #include <linux/nfs_idmap.h> |
57e62324 BS |
40 | #include <net/net_namespace.h> |
41 | #include <linux/sunrpc/rpc_pipe_fs.h> | |
6926afd1 | 42 | #include <linux/nfs_fs.h> |
3cd0f37a | 43 | #include <linux/nfs_fs_sb.h> |
57e62324 | 44 | #include <linux/key.h> |
3cd0f37a BS |
45 | #include <linux/keyctl.h> |
46 | #include <linux/key-type.h> | |
3cd0f37a | 47 | #include <keys/user-type.h> |
3cd0f37a | 48 | #include <linux/module.h> |
57e62324 | 49 | |
3cd0f37a | 50 | #include "internal.h" |
17347d03 | 51 | #include "netns.h" |
3cd0f37a BS |
52 | |
53 | #define NFS_UINT_MAXLEN 11 | |
3cd0f37a | 54 | |
17280175 TM |
55 | static const struct cred *id_resolver_cache; |
56 | static struct key_type key_type_id_resolver_legacy; | |
3cd0f37a | 57 | |
b1027439 BS |
58 | struct idmap { |
59 | struct rpc_pipe *idmap_pipe; | |
60 | struct key_construction *idmap_key_cons; | |
61 | struct mutex idmap_mutex; | |
62 | }; | |
6926afd1 | 63 | |
c5066945 BS |
64 | struct idmap_legacy_upcalldata { |
65 | struct rpc_pipe_msg pipe_msg; | |
66 | struct idmap_msg idmap_msg; | |
67 | struct idmap *idmap; | |
68 | }; | |
69 | ||
6926afd1 TM |
70 | /** |
71 | * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields | |
72 | * @fattr: fully initialised struct nfs_fattr | |
73 | * @owner_name: owner name string cache | |
74 | * @group_name: group name string cache | |
75 | */ | |
76 | void nfs_fattr_init_names(struct nfs_fattr *fattr, | |
77 | struct nfs4_string *owner_name, | |
78 | struct nfs4_string *group_name) | |
79 | { | |
80 | fattr->owner_name = owner_name; | |
81 | fattr->group_name = group_name; | |
82 | } | |
83 | ||
84 | static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr) | |
85 | { | |
86 | fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME; | |
87 | kfree(fattr->owner_name->data); | |
88 | } | |
89 | ||
90 | static void nfs_fattr_free_group_name(struct nfs_fattr *fattr) | |
91 | { | |
92 | fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME; | |
93 | kfree(fattr->group_name->data); | |
94 | } | |
95 | ||
96 | static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr) | |
97 | { | |
98 | struct nfs4_string *owner = fattr->owner_name; | |
99 | __u32 uid; | |
100 | ||
101 | if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)) | |
102 | return false; | |
103 | if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) { | |
104 | fattr->uid = uid; | |
105 | fattr->valid |= NFS_ATTR_FATTR_OWNER; | |
106 | } | |
107 | return true; | |
108 | } | |
109 | ||
110 | static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr) | |
111 | { | |
112 | struct nfs4_string *group = fattr->group_name; | |
113 | __u32 gid; | |
114 | ||
115 | if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)) | |
116 | return false; | |
117 | if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) { | |
118 | fattr->gid = gid; | |
119 | fattr->valid |= NFS_ATTR_FATTR_GROUP; | |
120 | } | |
121 | return true; | |
122 | } | |
123 | ||
124 | /** | |
125 | * nfs_fattr_free_names - free up the NFSv4 owner and group strings | |
126 | * @fattr: a fully initialised nfs_fattr structure | |
127 | */ | |
128 | void nfs_fattr_free_names(struct nfs_fattr *fattr) | |
129 | { | |
130 | if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME) | |
131 | nfs_fattr_free_owner_name(fattr); | |
132 | if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME) | |
133 | nfs_fattr_free_group_name(fattr); | |
134 | } | |
135 | ||
136 | /** | |
137 | * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free | |
138 | * @server: pointer to the filesystem nfs_server structure | |
139 | * @fattr: a fully initialised nfs_fattr structure | |
140 | * | |
141 | * This helper maps the cached NFSv4 owner/group strings in fattr into | |
142 | * their numeric uid/gid equivalents, and then frees the cached strings. | |
143 | */ | |
144 | void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr) | |
145 | { | |
146 | if (nfs_fattr_map_owner_name(server, fattr)) | |
147 | nfs_fattr_free_owner_name(fattr); | |
148 | if (nfs_fattr_map_group_name(server, fattr)) | |
149 | nfs_fattr_free_group_name(fattr); | |
150 | } | |
5cf36cfd TM |
151 | |
152 | static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res) | |
153 | { | |
154 | unsigned long val; | |
155 | char buf[16]; | |
156 | ||
157 | if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf)) | |
158 | return 0; | |
159 | memcpy(buf, name, namelen); | |
160 | buf[namelen] = '\0'; | |
161 | if (strict_strtoul(buf, 0, &val) != 0) | |
162 | return 0; | |
163 | *res = val; | |
164 | return 1; | |
165 | } | |
1da177e4 | 166 | |
f0b85168 TM |
167 | static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen) |
168 | { | |
169 | return snprintf(buf, buflen, "%u", id); | |
170 | } | |
171 | ||
17280175 | 172 | static struct key_type key_type_id_resolver = { |
955a857e BS |
173 | .name = "id_resolver", |
174 | .instantiate = user_instantiate, | |
175 | .match = user_match, | |
176 | .revoke = user_revoke, | |
177 | .destroy = user_destroy, | |
178 | .describe = user_describe, | |
179 | .read = user_read, | |
180 | }; | |
181 | ||
e6499c6f | 182 | static int nfs_idmap_init_keyring(void) |
955a857e BS |
183 | { |
184 | struct cred *cred; | |
185 | struct key *keyring; | |
186 | int ret = 0; | |
187 | ||
f9fd2d9c WAA |
188 | printk(KERN_NOTICE "NFS: Registering the %s key type\n", |
189 | key_type_id_resolver.name); | |
955a857e BS |
190 | |
191 | cred = prepare_kernel_cred(NULL); | |
192 | if (!cred) | |
193 | return -ENOMEM; | |
194 | ||
195 | keyring = key_alloc(&key_type_keyring, ".id_resolver", 0, 0, cred, | |
196 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
197 | KEY_USR_VIEW | KEY_USR_READ, | |
198 | KEY_ALLOC_NOT_IN_QUOTA); | |
199 | if (IS_ERR(keyring)) { | |
200 | ret = PTR_ERR(keyring); | |
201 | goto failed_put_cred; | |
202 | } | |
203 | ||
204 | ret = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL); | |
205 | if (ret < 0) | |
206 | goto failed_put_key; | |
207 | ||
208 | ret = register_key_type(&key_type_id_resolver); | |
209 | if (ret < 0) | |
210 | goto failed_put_key; | |
211 | ||
a427b9ec DH |
212 | ret = register_key_type(&key_type_id_resolver_legacy); |
213 | if (ret < 0) | |
214 | goto failed_reg_legacy; | |
215 | ||
700920eb | 216 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
955a857e BS |
217 | cred->thread_keyring = keyring; |
218 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
219 | id_resolver_cache = cred; | |
220 | return 0; | |
221 | ||
a427b9ec DH |
222 | failed_reg_legacy: |
223 | unregister_key_type(&key_type_id_resolver); | |
955a857e BS |
224 | failed_put_key: |
225 | key_put(keyring); | |
226 | failed_put_cred: | |
227 | put_cred(cred); | |
228 | return ret; | |
229 | } | |
230 | ||
e6499c6f | 231 | static void nfs_idmap_quit_keyring(void) |
955a857e BS |
232 | { |
233 | key_revoke(id_resolver_cache->thread_keyring); | |
234 | unregister_key_type(&key_type_id_resolver); | |
a427b9ec | 235 | unregister_key_type(&key_type_id_resolver_legacy); |
955a857e BS |
236 | put_cred(id_resolver_cache); |
237 | } | |
238 | ||
239 | /* | |
240 | * Assemble the description to pass to request_key() | |
241 | * This function will allocate a new string and update dest to point | |
242 | * at it. The caller is responsible for freeing dest. | |
243 | * | |
244 | * On error 0 is returned. Otherwise, the length of dest is returned. | |
245 | */ | |
246 | static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen, | |
247 | const char *type, size_t typelen, char **desc) | |
248 | { | |
249 | char *cp; | |
250 | size_t desclen = typelen + namelen + 2; | |
251 | ||
252 | *desc = kmalloc(desclen, GFP_KERNEL); | |
8f0d97b4 | 253 | if (!*desc) |
955a857e BS |
254 | return -ENOMEM; |
255 | ||
256 | cp = *desc; | |
257 | memcpy(cp, type, typelen); | |
258 | cp += typelen; | |
259 | *cp++ = ':'; | |
260 | ||
261 | memcpy(cp, name, namelen); | |
262 | cp += namelen; | |
263 | *cp = '\0'; | |
264 | return desclen; | |
265 | } | |
266 | ||
57e62324 BS |
267 | static ssize_t nfs_idmap_request_key(struct key_type *key_type, |
268 | const char *name, size_t namelen, | |
269 | const char *type, void *data, | |
270 | size_t data_size, struct idmap *idmap) | |
955a857e BS |
271 | { |
272 | const struct cred *saved_cred; | |
273 | struct key *rkey; | |
274 | char *desc; | |
275 | struct user_key_payload *payload; | |
276 | ssize_t ret; | |
277 | ||
278 | ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc); | |
279 | if (ret <= 0) | |
280 | goto out; | |
281 | ||
282 | saved_cred = override_creds(id_resolver_cache); | |
57e62324 BS |
283 | if (idmap) |
284 | rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap); | |
285 | else | |
286 | rkey = request_key(&key_type_id_resolver, desc, ""); | |
955a857e | 287 | revert_creds(saved_cred); |
57e62324 | 288 | |
955a857e BS |
289 | kfree(desc); |
290 | if (IS_ERR(rkey)) { | |
291 | ret = PTR_ERR(rkey); | |
292 | goto out; | |
293 | } | |
294 | ||
295 | rcu_read_lock(); | |
296 | rkey->perm |= KEY_USR_VIEW; | |
297 | ||
298 | ret = key_validate(rkey); | |
299 | if (ret < 0) | |
300 | goto out_up; | |
301 | ||
302 | payload = rcu_dereference(rkey->payload.data); | |
303 | if (IS_ERR_OR_NULL(payload)) { | |
304 | ret = PTR_ERR(payload); | |
305 | goto out_up; | |
306 | } | |
307 | ||
308 | ret = payload->datalen; | |
309 | if (ret > 0 && ret <= data_size) | |
310 | memcpy(data, payload->data, ret); | |
311 | else | |
312 | ret = -EINVAL; | |
313 | ||
314 | out_up: | |
315 | rcu_read_unlock(); | |
316 | key_put(rkey); | |
317 | out: | |
318 | return ret; | |
319 | } | |
320 | ||
57e62324 BS |
321 | static ssize_t nfs_idmap_get_key(const char *name, size_t namelen, |
322 | const char *type, void *data, | |
323 | size_t data_size, struct idmap *idmap) | |
324 | { | |
325 | ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver, | |
326 | name, namelen, type, data, | |
327 | data_size, NULL); | |
328 | if (ret < 0) { | |
b1027439 | 329 | mutex_lock(&idmap->idmap_mutex); |
57e62324 BS |
330 | ret = nfs_idmap_request_key(&key_type_id_resolver_legacy, |
331 | name, namelen, type, data, | |
332 | data_size, idmap); | |
c5066945 | 333 | idmap->idmap_key_cons = NULL; |
b1027439 | 334 | mutex_unlock(&idmap->idmap_mutex); |
57e62324 BS |
335 | } |
336 | return ret; | |
337 | } | |
955a857e BS |
338 | |
339 | /* ID -> Name */ | |
57e62324 BS |
340 | static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf, |
341 | size_t buflen, struct idmap *idmap) | |
955a857e BS |
342 | { |
343 | char id_str[NFS_UINT_MAXLEN]; | |
344 | int id_len; | |
345 | ssize_t ret; | |
346 | ||
347 | id_len = snprintf(id_str, sizeof(id_str), "%u", id); | |
57e62324 | 348 | ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap); |
955a857e BS |
349 | if (ret < 0) |
350 | return -EINVAL; | |
351 | return ret; | |
352 | } | |
353 | ||
354 | /* Name -> ID */ | |
57e62324 BS |
355 | static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type, |
356 | __u32 *id, struct idmap *idmap) | |
955a857e BS |
357 | { |
358 | char id_str[NFS_UINT_MAXLEN]; | |
359 | long id_long; | |
360 | ssize_t data_size; | |
361 | int ret = 0; | |
362 | ||
57e62324 | 363 | data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap); |
955a857e BS |
364 | if (data_size <= 0) { |
365 | ret = -EINVAL; | |
366 | } else { | |
367 | ret = strict_strtol(id_str, 10, &id_long); | |
368 | *id = (__u32)id_long; | |
369 | } | |
370 | return ret; | |
371 | } | |
372 | ||
e6499c6f | 373 | /* idmap classic begins here */ |
f0b85168 | 374 | |
57e62324 BS |
375 | enum { |
376 | Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err | |
1da177e4 LT |
377 | }; |
378 | ||
57e62324 BS |
379 | static const match_table_t nfs_idmap_tokens = { |
380 | { Opt_find_uid, "uid:%s" }, | |
381 | { Opt_find_gid, "gid:%s" }, | |
382 | { Opt_find_user, "user:%s" }, | |
383 | { Opt_find_group, "group:%s" }, | |
384 | { Opt_find_err, NULL } | |
1da177e4 LT |
385 | }; |
386 | ||
57e62324 | 387 | static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *); |
369af0f1 CL |
388 | static ssize_t idmap_pipe_downcall(struct file *, const char __user *, |
389 | size_t); | |
c5066945 | 390 | static void idmap_release_pipe(struct inode *); |
369af0f1 | 391 | static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); |
1da177e4 | 392 | |
b693ba4a | 393 | static const struct rpc_pipe_ops idmap_upcall_ops = { |
c1225158 | 394 | .upcall = rpc_pipe_generic_upcall, |
369af0f1 | 395 | .downcall = idmap_pipe_downcall, |
c5066945 | 396 | .release_pipe = idmap_release_pipe, |
369af0f1 | 397 | .destroy_msg = idmap_pipe_destroy_msg, |
1da177e4 LT |
398 | }; |
399 | ||
17280175 | 400 | static struct key_type key_type_id_resolver_legacy = { |
a427b9ec | 401 | .name = "id_legacy", |
57e62324 BS |
402 | .instantiate = user_instantiate, |
403 | .match = user_match, | |
404 | .revoke = user_revoke, | |
405 | .destroy = user_destroy, | |
406 | .describe = user_describe, | |
407 | .read = user_read, | |
408 | .request_key = nfs_idmap_legacy_upcall, | |
409 | }; | |
410 | ||
4929d1d3 SK |
411 | static void __nfs_idmap_unregister(struct rpc_pipe *pipe) |
412 | { | |
413 | if (pipe->dentry) | |
414 | rpc_unlink(pipe->dentry); | |
415 | } | |
416 | ||
417 | static int __nfs_idmap_register(struct dentry *dir, | |
418 | struct idmap *idmap, | |
419 | struct rpc_pipe *pipe) | |
420 | { | |
421 | struct dentry *dentry; | |
422 | ||
423 | dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe); | |
424 | if (IS_ERR(dentry)) | |
425 | return PTR_ERR(dentry); | |
426 | pipe->dentry = dentry; | |
427 | return 0; | |
428 | } | |
429 | ||
430 | static void nfs_idmap_unregister(struct nfs_client *clp, | |
431 | struct rpc_pipe *pipe) | |
432 | { | |
73ea666c | 433 | struct net *net = clp->cl_net; |
4929d1d3 SK |
434 | struct super_block *pipefs_sb; |
435 | ||
436 | pipefs_sb = rpc_get_sb_net(net); | |
437 | if (pipefs_sb) { | |
438 | __nfs_idmap_unregister(pipe); | |
439 | rpc_put_sb_net(net); | |
440 | } | |
441 | } | |
442 | ||
443 | static int nfs_idmap_register(struct nfs_client *clp, | |
444 | struct idmap *idmap, | |
445 | struct rpc_pipe *pipe) | |
446 | { | |
73ea666c | 447 | struct net *net = clp->cl_net; |
4929d1d3 SK |
448 | struct super_block *pipefs_sb; |
449 | int err = 0; | |
450 | ||
451 | pipefs_sb = rpc_get_sb_net(net); | |
452 | if (pipefs_sb) { | |
453 | if (clp->cl_rpcclient->cl_dentry) | |
454 | err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry, | |
455 | idmap, pipe); | |
456 | rpc_put_sb_net(net); | |
457 | } | |
458 | return err; | |
459 | } | |
460 | ||
b7162792 | 461 | int |
adfa6f98 | 462 | nfs_idmap_new(struct nfs_client *clp) |
1da177e4 LT |
463 | { |
464 | struct idmap *idmap; | |
c239d83b | 465 | struct rpc_pipe *pipe; |
b7162792 | 466 | int error; |
1da177e4 | 467 | |
54ceac45 | 468 | BUG_ON(clp->cl_idmap != NULL); |
b7162792 | 469 | |
369af0f1 CL |
470 | idmap = kzalloc(sizeof(*idmap), GFP_KERNEL); |
471 | if (idmap == NULL) | |
472 | return -ENOMEM; | |
1da177e4 | 473 | |
c239d83b SK |
474 | pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0); |
475 | if (IS_ERR(pipe)) { | |
476 | error = PTR_ERR(pipe); | |
1da177e4 | 477 | kfree(idmap); |
b7162792 | 478 | return error; |
1da177e4 | 479 | } |
4929d1d3 SK |
480 | error = nfs_idmap_register(clp, idmap, pipe); |
481 | if (error) { | |
c239d83b SK |
482 | rpc_destroy_pipe_data(pipe); |
483 | kfree(idmap); | |
484 | return error; | |
485 | } | |
486 | idmap->idmap_pipe = pipe; | |
b1027439 | 487 | mutex_init(&idmap->idmap_mutex); |
1da177e4 LT |
488 | |
489 | clp->cl_idmap = idmap; | |
b7162792 | 490 | return 0; |
1da177e4 LT |
491 | } |
492 | ||
493 | void | |
adfa6f98 | 494 | nfs_idmap_delete(struct nfs_client *clp) |
1da177e4 LT |
495 | { |
496 | struct idmap *idmap = clp->cl_idmap; | |
497 | ||
498 | if (!idmap) | |
499 | return; | |
4929d1d3 | 500 | nfs_idmap_unregister(clp, idmap->idmap_pipe); |
c239d83b | 501 | rpc_destroy_pipe_data(idmap->idmap_pipe); |
1da177e4 LT |
502 | clp->cl_idmap = NULL; |
503 | kfree(idmap); | |
504 | } | |
505 | ||
eee17325 SK |
506 | static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event, |
507 | struct super_block *sb) | |
1da177e4 | 508 | { |
eee17325 | 509 | int err = 0; |
1da177e4 | 510 | |
eee17325 SK |
511 | switch (event) { |
512 | case RPC_PIPEFS_MOUNT: | |
513 | BUG_ON(clp->cl_rpcclient->cl_dentry == NULL); | |
514 | err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry, | |
515 | clp->cl_idmap, | |
516 | clp->cl_idmap->idmap_pipe); | |
517 | break; | |
518 | case RPC_PIPEFS_UMOUNT: | |
519 | if (clp->cl_idmap->idmap_pipe) { | |
520 | struct dentry *parent; | |
521 | ||
522 | parent = clp->cl_idmap->idmap_pipe->dentry->d_parent; | |
523 | __nfs_idmap_unregister(clp->cl_idmap->idmap_pipe); | |
524 | /* | |
525 | * Note: This is a dirty hack. SUNRPC hook has been | |
526 | * called already but simple_rmdir() call for the | |
527 | * directory returned with error because of idmap pipe | |
528 | * inside. Thus now we have to remove this directory | |
529 | * here. | |
530 | */ | |
531 | if (rpc_rmdir(parent)) | |
a030889a WAA |
532 | printk(KERN_ERR "NFS: %s: failed to remove " |
533 | "clnt dir!\n", __func__); | |
eee17325 SK |
534 | } |
535 | break; | |
536 | default: | |
a030889a WAA |
537 | printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__, |
538 | event); | |
eee17325 SK |
539 | return -ENOTSUPP; |
540 | } | |
541 | return err; | |
542 | } | |
543 | ||
e9dbca8d | 544 | static struct nfs_client *nfs_get_client_for_event(struct net *net, int event) |
eee17325 | 545 | { |
e9dbca8d SK |
546 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
547 | struct dentry *cl_dentry; | |
eee17325 | 548 | struct nfs_client *clp; |
4697bd5e | 549 | int err; |
eee17325 | 550 | |
4697bd5e | 551 | restart: |
dc030858 | 552 | spin_lock(&nn->nfs_client_lock); |
6b13168b | 553 | list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { |
4697bd5e TM |
554 | /* Wait for initialisation to finish */ |
555 | if (clp->cl_cons_state == NFS_CS_INITING) { | |
556 | atomic_inc(&clp->cl_count); | |
557 | spin_unlock(&nn->nfs_client_lock); | |
558 | err = nfs_wait_client_init_complete(clp); | |
559 | nfs_put_client(clp); | |
560 | if (err) | |
561 | return NULL; | |
562 | goto restart; | |
563 | } | |
564 | /* Skip nfs_clients that failed to initialise */ | |
565 | if (clp->cl_cons_state < 0) | |
566 | continue; | |
54ac471c | 567 | smp_rmb(); |
eee17325 SK |
568 | if (clp->rpc_ops != &nfs_v4_clientops) |
569 | continue; | |
e9dbca8d SK |
570 | cl_dentry = clp->cl_idmap->idmap_pipe->dentry; |
571 | if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) || | |
572 | ((event == RPC_PIPEFS_UMOUNT) && !cl_dentry)) | |
573 | continue; | |
574 | atomic_inc(&clp->cl_count); | |
575 | spin_unlock(&nn->nfs_client_lock); | |
576 | return clp; | |
577 | } | |
578 | spin_unlock(&nn->nfs_client_lock); | |
579 | return NULL; | |
1da177e4 LT |
580 | } |
581 | ||
e9dbca8d SK |
582 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
583 | void *ptr) | |
1da177e4 | 584 | { |
e9dbca8d SK |
585 | struct super_block *sb = ptr; |
586 | struct nfs_client *clp; | |
587 | int error = 0; | |
1da177e4 | 588 | |
71dfc5fa SK |
589 | if (!try_module_get(THIS_MODULE)) |
590 | return 0; | |
591 | ||
e9dbca8d | 592 | while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) { |
eee17325 | 593 | error = __rpc_pipefs_event(clp, event, sb); |
e9dbca8d | 594 | nfs_put_client(clp); |
eee17325 SK |
595 | if (error) |
596 | break; | |
597 | } | |
71dfc5fa | 598 | module_put(THIS_MODULE); |
eee17325 | 599 | return error; |
1da177e4 LT |
600 | } |
601 | ||
eee17325 SK |
602 | #define PIPEFS_NFS_PRIO 1 |
603 | ||
604 | static struct notifier_block nfs_idmap_block = { | |
605 | .notifier_call = rpc_pipefs_event, | |
606 | .priority = SUNRPC_PIPEFS_NFS_PRIO, | |
607 | }; | |
1da177e4 | 608 | |
eee17325 | 609 | int nfs_idmap_init(void) |
1da177e4 | 610 | { |
e6499c6f BS |
611 | int ret; |
612 | ret = nfs_idmap_init_keyring(); | |
613 | if (ret != 0) | |
614 | goto out; | |
615 | ret = rpc_pipefs_notifier_register(&nfs_idmap_block); | |
616 | if (ret != 0) | |
617 | nfs_idmap_quit_keyring(); | |
618 | out: | |
619 | return ret; | |
1da177e4 LT |
620 | } |
621 | ||
eee17325 | 622 | void nfs_idmap_quit(void) |
1da177e4 | 623 | { |
eee17325 | 624 | rpc_pipefs_notifier_unregister(&nfs_idmap_block); |
e6499c6f | 625 | nfs_idmap_quit_keyring(); |
1da177e4 LT |
626 | } |
627 | ||
c5066945 BS |
628 | static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap, |
629 | struct idmap_msg *im, | |
57e62324 | 630 | struct rpc_pipe_msg *msg) |
1da177e4 | 631 | { |
57e62324 BS |
632 | substring_t substr; |
633 | int token, ret; | |
1da177e4 | 634 | |
57e62324 BS |
635 | memset(im, 0, sizeof(*im)); |
636 | memset(msg, 0, sizeof(*msg)); | |
1da177e4 | 637 | |
57e62324 BS |
638 | im->im_type = IDMAP_TYPE_GROUP; |
639 | token = match_token(desc, nfs_idmap_tokens, &substr); | |
1da177e4 | 640 | |
57e62324 BS |
641 | switch (token) { |
642 | case Opt_find_uid: | |
643 | im->im_type = IDMAP_TYPE_USER; | |
644 | case Opt_find_gid: | |
645 | im->im_conv = IDMAP_CONV_NAMETOID; | |
646 | ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ); | |
647 | break; | |
1da177e4 | 648 | |
57e62324 BS |
649 | case Opt_find_user: |
650 | im->im_type = IDMAP_TYPE_USER; | |
651 | case Opt_find_group: | |
652 | im->im_conv = IDMAP_CONV_IDTONAME; | |
653 | ret = match_int(&substr, &im->im_id); | |
654 | break; | |
1da177e4 | 655 | |
57e62324 BS |
656 | default: |
657 | ret = -EINVAL; | |
1da177e4 LT |
658 | goto out; |
659 | } | |
660 | ||
57e62324 BS |
661 | msg->data = im; |
662 | msg->len = sizeof(struct idmap_msg); | |
1da177e4 | 663 | |
57e62324 | 664 | out: |
369af0f1 | 665 | return ret; |
1da177e4 LT |
666 | } |
667 | ||
57e62324 BS |
668 | static int nfs_idmap_legacy_upcall(struct key_construction *cons, |
669 | const char *op, | |
670 | void *aux) | |
1da177e4 | 671 | { |
c5066945 | 672 | struct idmap_legacy_upcalldata *data; |
57e62324 | 673 | struct rpc_pipe_msg *msg; |
1da177e4 | 674 | struct idmap_msg *im; |
57e62324 BS |
675 | struct idmap *idmap = (struct idmap *)aux; |
676 | struct key *key = cons->key; | |
5abc03cd | 677 | int ret = -ENOMEM; |
1da177e4 | 678 | |
57e62324 | 679 | /* msg and im are freed in idmap_pipe_destroy_msg */ |
c5066945 BS |
680 | data = kmalloc(sizeof(*data), GFP_KERNEL); |
681 | if (!data) | |
57e62324 | 682 | goto out1; |
1da177e4 | 683 | |
c5066945 BS |
684 | msg = &data->pipe_msg; |
685 | im = &data->idmap_msg; | |
686 | data->idmap = idmap; | |
687 | ||
688 | ret = nfs_idmap_prepare_message(key->description, idmap, im, msg); | |
57e62324 BS |
689 | if (ret < 0) |
690 | goto out2; | |
1da177e4 | 691 | |
a427b9ec | 692 | BUG_ON(idmap->idmap_key_cons != NULL); |
57e62324 | 693 | idmap->idmap_key_cons = cons; |
1da177e4 | 694 | |
11588f49 BS |
695 | ret = rpc_queue_upcall(idmap->idmap_pipe, msg); |
696 | if (ret < 0) | |
c5066945 | 697 | goto out3; |
1da177e4 | 698 | |
11588f49 | 699 | return ret; |
57e62324 | 700 | |
c5066945 BS |
701 | out3: |
702 | idmap->idmap_key_cons = NULL; | |
57e62324 | 703 | out2: |
c5066945 | 704 | kfree(data); |
57e62324 | 705 | out1: |
a427b9ec | 706 | complete_request_key(cons, ret); |
369af0f1 | 707 | return ret; |
1da177e4 LT |
708 | } |
709 | ||
57e62324 | 710 | static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data) |
1da177e4 | 711 | { |
57e62324 BS |
712 | return key_instantiate_and_link(key, data, strlen(data) + 1, |
713 | id_resolver_cache->thread_keyring, | |
714 | authkey); | |
715 | } | |
1da177e4 | 716 | |
57e62324 BS |
717 | static int nfs_idmap_read_message(struct idmap_msg *im, struct key *key, struct key *authkey) |
718 | { | |
719 | char id_str[NFS_UINT_MAXLEN]; | |
720 | int ret = -EINVAL; | |
1da177e4 | 721 | |
57e62324 BS |
722 | switch (im->im_conv) { |
723 | case IDMAP_CONV_NAMETOID: | |
724 | sprintf(id_str, "%d", im->im_id); | |
725 | ret = nfs_idmap_instantiate(key, authkey, id_str); | |
726 | break; | |
727 | case IDMAP_CONV_IDTONAME: | |
728 | ret = nfs_idmap_instantiate(key, authkey, im->im_name); | |
729 | break; | |
1da177e4 LT |
730 | } |
731 | ||
1da177e4 LT |
732 | return ret; |
733 | } | |
734 | ||
1da177e4 LT |
735 | static ssize_t |
736 | idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
737 | { | |
369af0f1 | 738 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 | 739 | struct idmap *idmap = (struct idmap *)rpci->private; |
a427b9ec | 740 | struct key_construction *cons; |
57e62324 | 741 | struct idmap_msg im; |
d24aae41 | 742 | size_t namelen_in; |
1da177e4 LT |
743 | int ret; |
744 | ||
a427b9ec DH |
745 | /* If instantiation is successful, anyone waiting for key construction |
746 | * will have been woken up and someone else may now have used | |
747 | * idmap_key_cons - so after this point we may no longer touch it. | |
748 | */ | |
749 | cons = ACCESS_ONCE(idmap->idmap_key_cons); | |
750 | idmap->idmap_key_cons = NULL; | |
751 | ||
57e62324 BS |
752 | if (mlen != sizeof(im)) { |
753 | ret = -ENOSPC; | |
1da177e4 LT |
754 | goto out; |
755 | } | |
756 | ||
57e62324 BS |
757 | if (copy_from_user(&im, src, mlen) != 0) { |
758 | ret = -EFAULT; | |
1da177e4 | 759 | goto out; |
57e62324 | 760 | } |
1da177e4 | 761 | |
57e62324 | 762 | if (!(im.im_status & IDMAP_STATUS_SUCCESS)) { |
12dfd080 BS |
763 | ret = -ENOKEY; |
764 | goto out; | |
1da177e4 LT |
765 | } |
766 | ||
57e62324 BS |
767 | namelen_in = strnlen(im.im_name, IDMAP_NAMESZ); |
768 | if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) { | |
769 | ret = -EINVAL; | |
1da177e4 LT |
770 | goto out; |
771 | } | |
772 | ||
57e62324 BS |
773 | ret = nfs_idmap_read_message(&im, cons->key, cons->authkey); |
774 | if (ret >= 0) { | |
775 | key_set_timeout(cons->key, nfs_idmap_cache_timeout); | |
776 | ret = mlen; | |
777 | } | |
778 | ||
1da177e4 | 779 | out: |
a427b9ec | 780 | complete_request_key(cons, ret); |
1da177e4 LT |
781 | return ret; |
782 | } | |
783 | ||
75c96f85 | 784 | static void |
1da177e4 LT |
785 | idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
786 | { | |
c5066945 BS |
787 | struct idmap_legacy_upcalldata *data = container_of(msg, |
788 | struct idmap_legacy_upcalldata, | |
789 | pipe_msg); | |
790 | struct idmap *idmap = data->idmap; | |
791 | struct key_construction *cons; | |
792 | if (msg->errno) { | |
793 | cons = ACCESS_ONCE(idmap->idmap_key_cons); | |
794 | idmap->idmap_key_cons = NULL; | |
795 | complete_request_key(cons, msg->errno); | |
796 | } | |
57e62324 | 797 | /* Free memory allocated in nfs_idmap_legacy_upcall() */ |
c5066945 BS |
798 | kfree(data); |
799 | } | |
800 | ||
801 | static void | |
802 | idmap_release_pipe(struct inode *inode) | |
803 | { | |
804 | struct rpc_inode *rpci = RPC_I(inode); | |
805 | struct idmap *idmap = (struct idmap *)rpci->private; | |
806 | idmap->idmap_key_cons = NULL; | |
1da177e4 LT |
807 | } |
808 | ||
e4fd72a1 | 809 | int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid) |
1da177e4 | 810 | { |
e4fd72a1 | 811 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 812 | |
5cf36cfd TM |
813 | if (nfs_map_string_to_numeric(name, namelen, uid)) |
814 | return 0; | |
57e62324 | 815 | return nfs_idmap_lookup_id(name, namelen, "uid", uid, idmap); |
1da177e4 LT |
816 | } |
817 | ||
e6499c6f | 818 | int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid) |
1da177e4 | 819 | { |
e4fd72a1 | 820 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 821 | |
e6499c6f | 822 | if (nfs_map_string_to_numeric(name, namelen, gid)) |
5cf36cfd | 823 | return 0; |
57e62324 | 824 | return nfs_idmap_lookup_id(name, namelen, "gid", gid, idmap); |
1da177e4 LT |
825 | } |
826 | ||
e4fd72a1 | 827 | int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen) |
1da177e4 | 828 | { |
e4fd72a1 | 829 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 830 | int ret = -EINVAL; |
1da177e4 | 831 | |
b064eca2 | 832 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
57e62324 | 833 | ret = nfs_idmap_lookup_name(uid, "user", buf, buflen, idmap); |
f0b85168 TM |
834 | if (ret < 0) |
835 | ret = nfs_map_numeric_to_string(uid, buf, buflen); | |
836 | return ret; | |
1da177e4 | 837 | } |
e6499c6f | 838 | int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen) |
1da177e4 | 839 | { |
e4fd72a1 | 840 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 841 | int ret = -EINVAL; |
1da177e4 | 842 | |
b064eca2 | 843 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
57e62324 | 844 | ret = nfs_idmap_lookup_name(gid, "group", buf, buflen, idmap); |
f0b85168 | 845 | if (ret < 0) |
e6499c6f | 846 | ret = nfs_map_numeric_to_string(gid, buf, buflen); |
f0b85168 | 847 | return ret; |
1da177e4 | 848 | } |