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 TM |
63 | |
64 | /** | |
65 | * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields | |
66 | * @fattr: fully initialised struct nfs_fattr | |
67 | * @owner_name: owner name string cache | |
68 | * @group_name: group name string cache | |
69 | */ | |
70 | void nfs_fattr_init_names(struct nfs_fattr *fattr, | |
71 | struct nfs4_string *owner_name, | |
72 | struct nfs4_string *group_name) | |
73 | { | |
74 | fattr->owner_name = owner_name; | |
75 | fattr->group_name = group_name; | |
76 | } | |
77 | ||
78 | static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr) | |
79 | { | |
80 | fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME; | |
81 | kfree(fattr->owner_name->data); | |
82 | } | |
83 | ||
84 | static void nfs_fattr_free_group_name(struct nfs_fattr *fattr) | |
85 | { | |
86 | fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME; | |
87 | kfree(fattr->group_name->data); | |
88 | } | |
89 | ||
90 | static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr) | |
91 | { | |
92 | struct nfs4_string *owner = fattr->owner_name; | |
93 | __u32 uid; | |
94 | ||
95 | if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)) | |
96 | return false; | |
97 | if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) { | |
98 | fattr->uid = uid; | |
99 | fattr->valid |= NFS_ATTR_FATTR_OWNER; | |
100 | } | |
101 | return true; | |
102 | } | |
103 | ||
104 | static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr) | |
105 | { | |
106 | struct nfs4_string *group = fattr->group_name; | |
107 | __u32 gid; | |
108 | ||
109 | if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)) | |
110 | return false; | |
111 | if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) { | |
112 | fattr->gid = gid; | |
113 | fattr->valid |= NFS_ATTR_FATTR_GROUP; | |
114 | } | |
115 | return true; | |
116 | } | |
117 | ||
118 | /** | |
119 | * nfs_fattr_free_names - free up the NFSv4 owner and group strings | |
120 | * @fattr: a fully initialised nfs_fattr structure | |
121 | */ | |
122 | void nfs_fattr_free_names(struct nfs_fattr *fattr) | |
123 | { | |
124 | if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME) | |
125 | nfs_fattr_free_owner_name(fattr); | |
126 | if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME) | |
127 | nfs_fattr_free_group_name(fattr); | |
128 | } | |
129 | ||
130 | /** | |
131 | * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free | |
132 | * @server: pointer to the filesystem nfs_server structure | |
133 | * @fattr: a fully initialised nfs_fattr structure | |
134 | * | |
135 | * This helper maps the cached NFSv4 owner/group strings in fattr into | |
136 | * their numeric uid/gid equivalents, and then frees the cached strings. | |
137 | */ | |
138 | void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr) | |
139 | { | |
140 | if (nfs_fattr_map_owner_name(server, fattr)) | |
141 | nfs_fattr_free_owner_name(fattr); | |
142 | if (nfs_fattr_map_group_name(server, fattr)) | |
143 | nfs_fattr_free_group_name(fattr); | |
144 | } | |
5cf36cfd TM |
145 | |
146 | static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res) | |
147 | { | |
148 | unsigned long val; | |
149 | char buf[16]; | |
150 | ||
151 | if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf)) | |
152 | return 0; | |
153 | memcpy(buf, name, namelen); | |
154 | buf[namelen] = '\0'; | |
155 | if (strict_strtoul(buf, 0, &val) != 0) | |
156 | return 0; | |
157 | *res = val; | |
158 | return 1; | |
159 | } | |
1da177e4 | 160 | |
f0b85168 TM |
161 | static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen) |
162 | { | |
163 | return snprintf(buf, buflen, "%u", id); | |
164 | } | |
165 | ||
17280175 | 166 | static struct key_type key_type_id_resolver = { |
955a857e BS |
167 | .name = "id_resolver", |
168 | .instantiate = user_instantiate, | |
169 | .match = user_match, | |
170 | .revoke = user_revoke, | |
171 | .destroy = user_destroy, | |
172 | .describe = user_describe, | |
173 | .read = user_read, | |
174 | }; | |
175 | ||
e6499c6f | 176 | static int nfs_idmap_init_keyring(void) |
955a857e BS |
177 | { |
178 | struct cred *cred; | |
179 | struct key *keyring; | |
180 | int ret = 0; | |
181 | ||
f9fd2d9c WAA |
182 | printk(KERN_NOTICE "NFS: Registering the %s key type\n", |
183 | key_type_id_resolver.name); | |
955a857e BS |
184 | |
185 | cred = prepare_kernel_cred(NULL); | |
186 | if (!cred) | |
187 | return -ENOMEM; | |
188 | ||
189 | keyring = key_alloc(&key_type_keyring, ".id_resolver", 0, 0, cred, | |
190 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
191 | KEY_USR_VIEW | KEY_USR_READ, | |
192 | KEY_ALLOC_NOT_IN_QUOTA); | |
193 | if (IS_ERR(keyring)) { | |
194 | ret = PTR_ERR(keyring); | |
195 | goto failed_put_cred; | |
196 | } | |
197 | ||
198 | ret = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL); | |
199 | if (ret < 0) | |
200 | goto failed_put_key; | |
201 | ||
202 | ret = register_key_type(&key_type_id_resolver); | |
203 | if (ret < 0) | |
204 | goto failed_put_key; | |
205 | ||
a427b9ec DH |
206 | ret = register_key_type(&key_type_id_resolver_legacy); |
207 | if (ret < 0) | |
208 | goto failed_reg_legacy; | |
209 | ||
700920eb | 210 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
955a857e BS |
211 | cred->thread_keyring = keyring; |
212 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
213 | id_resolver_cache = cred; | |
214 | return 0; | |
215 | ||
a427b9ec DH |
216 | failed_reg_legacy: |
217 | unregister_key_type(&key_type_id_resolver); | |
955a857e BS |
218 | failed_put_key: |
219 | key_put(keyring); | |
220 | failed_put_cred: | |
221 | put_cred(cred); | |
222 | return ret; | |
223 | } | |
224 | ||
e6499c6f | 225 | static void nfs_idmap_quit_keyring(void) |
955a857e BS |
226 | { |
227 | key_revoke(id_resolver_cache->thread_keyring); | |
228 | unregister_key_type(&key_type_id_resolver); | |
a427b9ec | 229 | unregister_key_type(&key_type_id_resolver_legacy); |
955a857e BS |
230 | put_cred(id_resolver_cache); |
231 | } | |
232 | ||
233 | /* | |
234 | * Assemble the description to pass to request_key() | |
235 | * This function will allocate a new string and update dest to point | |
236 | * at it. The caller is responsible for freeing dest. | |
237 | * | |
238 | * On error 0 is returned. Otherwise, the length of dest is returned. | |
239 | */ | |
240 | static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen, | |
241 | const char *type, size_t typelen, char **desc) | |
242 | { | |
243 | char *cp; | |
244 | size_t desclen = typelen + namelen + 2; | |
245 | ||
246 | *desc = kmalloc(desclen, GFP_KERNEL); | |
8f0d97b4 | 247 | if (!*desc) |
955a857e BS |
248 | return -ENOMEM; |
249 | ||
250 | cp = *desc; | |
251 | memcpy(cp, type, typelen); | |
252 | cp += typelen; | |
253 | *cp++ = ':'; | |
254 | ||
255 | memcpy(cp, name, namelen); | |
256 | cp += namelen; | |
257 | *cp = '\0'; | |
258 | return desclen; | |
259 | } | |
260 | ||
57e62324 BS |
261 | static ssize_t nfs_idmap_request_key(struct key_type *key_type, |
262 | const char *name, size_t namelen, | |
263 | const char *type, void *data, | |
264 | size_t data_size, struct idmap *idmap) | |
955a857e BS |
265 | { |
266 | const struct cred *saved_cred; | |
267 | struct key *rkey; | |
268 | char *desc; | |
269 | struct user_key_payload *payload; | |
270 | ssize_t ret; | |
271 | ||
272 | ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc); | |
273 | if (ret <= 0) | |
274 | goto out; | |
275 | ||
276 | saved_cred = override_creds(id_resolver_cache); | |
57e62324 BS |
277 | if (idmap) |
278 | rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap); | |
279 | else | |
280 | rkey = request_key(&key_type_id_resolver, desc, ""); | |
955a857e | 281 | revert_creds(saved_cred); |
57e62324 | 282 | |
955a857e BS |
283 | kfree(desc); |
284 | if (IS_ERR(rkey)) { | |
285 | ret = PTR_ERR(rkey); | |
286 | goto out; | |
287 | } | |
288 | ||
289 | rcu_read_lock(); | |
290 | rkey->perm |= KEY_USR_VIEW; | |
291 | ||
292 | ret = key_validate(rkey); | |
293 | if (ret < 0) | |
294 | goto out_up; | |
295 | ||
296 | payload = rcu_dereference(rkey->payload.data); | |
297 | if (IS_ERR_OR_NULL(payload)) { | |
298 | ret = PTR_ERR(payload); | |
299 | goto out_up; | |
300 | } | |
301 | ||
302 | ret = payload->datalen; | |
303 | if (ret > 0 && ret <= data_size) | |
304 | memcpy(data, payload->data, ret); | |
305 | else | |
306 | ret = -EINVAL; | |
307 | ||
308 | out_up: | |
309 | rcu_read_unlock(); | |
310 | key_put(rkey); | |
311 | out: | |
312 | return ret; | |
313 | } | |
314 | ||
57e62324 BS |
315 | static ssize_t nfs_idmap_get_key(const char *name, size_t namelen, |
316 | const char *type, void *data, | |
317 | size_t data_size, struct idmap *idmap) | |
318 | { | |
319 | ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver, | |
320 | name, namelen, type, data, | |
321 | data_size, NULL); | |
322 | if (ret < 0) { | |
b1027439 | 323 | mutex_lock(&idmap->idmap_mutex); |
57e62324 BS |
324 | ret = nfs_idmap_request_key(&key_type_id_resolver_legacy, |
325 | name, namelen, type, data, | |
326 | data_size, idmap); | |
b1027439 | 327 | mutex_unlock(&idmap->idmap_mutex); |
57e62324 BS |
328 | } |
329 | return ret; | |
330 | } | |
955a857e BS |
331 | |
332 | /* ID -> Name */ | |
57e62324 BS |
333 | static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf, |
334 | size_t buflen, struct idmap *idmap) | |
955a857e BS |
335 | { |
336 | char id_str[NFS_UINT_MAXLEN]; | |
337 | int id_len; | |
338 | ssize_t ret; | |
339 | ||
340 | id_len = snprintf(id_str, sizeof(id_str), "%u", id); | |
57e62324 | 341 | ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap); |
955a857e BS |
342 | if (ret < 0) |
343 | return -EINVAL; | |
344 | return ret; | |
345 | } | |
346 | ||
347 | /* Name -> ID */ | |
57e62324 BS |
348 | static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type, |
349 | __u32 *id, struct idmap *idmap) | |
955a857e BS |
350 | { |
351 | char id_str[NFS_UINT_MAXLEN]; | |
352 | long id_long; | |
353 | ssize_t data_size; | |
354 | int ret = 0; | |
355 | ||
57e62324 | 356 | data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap); |
955a857e BS |
357 | if (data_size <= 0) { |
358 | ret = -EINVAL; | |
359 | } else { | |
360 | ret = strict_strtol(id_str, 10, &id_long); | |
361 | *id = (__u32)id_long; | |
362 | } | |
363 | return ret; | |
364 | } | |
365 | ||
e6499c6f | 366 | /* idmap classic begins here */ |
f0b85168 | 367 | |
57e62324 BS |
368 | enum { |
369 | Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err | |
1da177e4 LT |
370 | }; |
371 | ||
57e62324 BS |
372 | static const match_table_t nfs_idmap_tokens = { |
373 | { Opt_find_uid, "uid:%s" }, | |
374 | { Opt_find_gid, "gid:%s" }, | |
375 | { Opt_find_user, "user:%s" }, | |
376 | { Opt_find_group, "group:%s" }, | |
377 | { Opt_find_err, NULL } | |
1da177e4 LT |
378 | }; |
379 | ||
57e62324 | 380 | static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *); |
369af0f1 CL |
381 | static ssize_t idmap_pipe_downcall(struct file *, const char __user *, |
382 | size_t); | |
383 | static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); | |
1da177e4 | 384 | |
b693ba4a | 385 | static const struct rpc_pipe_ops idmap_upcall_ops = { |
c1225158 | 386 | .upcall = rpc_pipe_generic_upcall, |
369af0f1 CL |
387 | .downcall = idmap_pipe_downcall, |
388 | .destroy_msg = idmap_pipe_destroy_msg, | |
1da177e4 LT |
389 | }; |
390 | ||
17280175 | 391 | static struct key_type key_type_id_resolver_legacy = { |
a427b9ec | 392 | .name = "id_legacy", |
57e62324 BS |
393 | .instantiate = user_instantiate, |
394 | .match = user_match, | |
395 | .revoke = user_revoke, | |
396 | .destroy = user_destroy, | |
397 | .describe = user_describe, | |
398 | .read = user_read, | |
399 | .request_key = nfs_idmap_legacy_upcall, | |
400 | }; | |
401 | ||
4929d1d3 SK |
402 | static void __nfs_idmap_unregister(struct rpc_pipe *pipe) |
403 | { | |
404 | if (pipe->dentry) | |
405 | rpc_unlink(pipe->dentry); | |
406 | } | |
407 | ||
408 | static int __nfs_idmap_register(struct dentry *dir, | |
409 | struct idmap *idmap, | |
410 | struct rpc_pipe *pipe) | |
411 | { | |
412 | struct dentry *dentry; | |
413 | ||
414 | dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe); | |
415 | if (IS_ERR(dentry)) | |
416 | return PTR_ERR(dentry); | |
417 | pipe->dentry = dentry; | |
418 | return 0; | |
419 | } | |
420 | ||
421 | static void nfs_idmap_unregister(struct nfs_client *clp, | |
422 | struct rpc_pipe *pipe) | |
423 | { | |
73ea666c | 424 | struct net *net = clp->cl_net; |
4929d1d3 SK |
425 | struct super_block *pipefs_sb; |
426 | ||
427 | pipefs_sb = rpc_get_sb_net(net); | |
428 | if (pipefs_sb) { | |
429 | __nfs_idmap_unregister(pipe); | |
430 | rpc_put_sb_net(net); | |
431 | } | |
432 | } | |
433 | ||
434 | static int nfs_idmap_register(struct nfs_client *clp, | |
435 | struct idmap *idmap, | |
436 | struct rpc_pipe *pipe) | |
437 | { | |
73ea666c | 438 | struct net *net = clp->cl_net; |
4929d1d3 SK |
439 | struct super_block *pipefs_sb; |
440 | int err = 0; | |
441 | ||
442 | pipefs_sb = rpc_get_sb_net(net); | |
443 | if (pipefs_sb) { | |
444 | if (clp->cl_rpcclient->cl_dentry) | |
445 | err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry, | |
446 | idmap, pipe); | |
447 | rpc_put_sb_net(net); | |
448 | } | |
449 | return err; | |
450 | } | |
451 | ||
b7162792 | 452 | int |
adfa6f98 | 453 | nfs_idmap_new(struct nfs_client *clp) |
1da177e4 LT |
454 | { |
455 | struct idmap *idmap; | |
c239d83b | 456 | struct rpc_pipe *pipe; |
b7162792 | 457 | int error; |
1da177e4 | 458 | |
54ceac45 | 459 | BUG_ON(clp->cl_idmap != NULL); |
b7162792 | 460 | |
369af0f1 CL |
461 | idmap = kzalloc(sizeof(*idmap), GFP_KERNEL); |
462 | if (idmap == NULL) | |
463 | return -ENOMEM; | |
1da177e4 | 464 | |
c239d83b SK |
465 | pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0); |
466 | if (IS_ERR(pipe)) { | |
467 | error = PTR_ERR(pipe); | |
1da177e4 | 468 | kfree(idmap); |
b7162792 | 469 | return error; |
1da177e4 | 470 | } |
4929d1d3 SK |
471 | error = nfs_idmap_register(clp, idmap, pipe); |
472 | if (error) { | |
c239d83b SK |
473 | rpc_destroy_pipe_data(pipe); |
474 | kfree(idmap); | |
475 | return error; | |
476 | } | |
477 | idmap->idmap_pipe = pipe; | |
b1027439 | 478 | mutex_init(&idmap->idmap_mutex); |
1da177e4 LT |
479 | |
480 | clp->cl_idmap = idmap; | |
b7162792 | 481 | return 0; |
1da177e4 LT |
482 | } |
483 | ||
484 | void | |
adfa6f98 | 485 | nfs_idmap_delete(struct nfs_client *clp) |
1da177e4 LT |
486 | { |
487 | struct idmap *idmap = clp->cl_idmap; | |
488 | ||
489 | if (!idmap) | |
490 | return; | |
4929d1d3 | 491 | nfs_idmap_unregister(clp, idmap->idmap_pipe); |
c239d83b | 492 | rpc_destroy_pipe_data(idmap->idmap_pipe); |
1da177e4 LT |
493 | clp->cl_idmap = NULL; |
494 | kfree(idmap); | |
495 | } | |
496 | ||
eee17325 SK |
497 | static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event, |
498 | struct super_block *sb) | |
1da177e4 | 499 | { |
eee17325 | 500 | int err = 0; |
1da177e4 | 501 | |
eee17325 SK |
502 | switch (event) { |
503 | case RPC_PIPEFS_MOUNT: | |
504 | BUG_ON(clp->cl_rpcclient->cl_dentry == NULL); | |
505 | err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry, | |
506 | clp->cl_idmap, | |
507 | clp->cl_idmap->idmap_pipe); | |
508 | break; | |
509 | case RPC_PIPEFS_UMOUNT: | |
510 | if (clp->cl_idmap->idmap_pipe) { | |
511 | struct dentry *parent; | |
512 | ||
513 | parent = clp->cl_idmap->idmap_pipe->dentry->d_parent; | |
514 | __nfs_idmap_unregister(clp->cl_idmap->idmap_pipe); | |
515 | /* | |
516 | * Note: This is a dirty hack. SUNRPC hook has been | |
517 | * called already but simple_rmdir() call for the | |
518 | * directory returned with error because of idmap pipe | |
519 | * inside. Thus now we have to remove this directory | |
520 | * here. | |
521 | */ | |
522 | if (rpc_rmdir(parent)) | |
a030889a WAA |
523 | printk(KERN_ERR "NFS: %s: failed to remove " |
524 | "clnt dir!\n", __func__); | |
eee17325 SK |
525 | } |
526 | break; | |
527 | default: | |
a030889a WAA |
528 | printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__, |
529 | event); | |
eee17325 SK |
530 | return -ENOTSUPP; |
531 | } | |
532 | return err; | |
533 | } | |
534 | ||
e9dbca8d | 535 | static struct nfs_client *nfs_get_client_for_event(struct net *net, int event) |
eee17325 | 536 | { |
e9dbca8d SK |
537 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
538 | struct dentry *cl_dentry; | |
eee17325 | 539 | struct nfs_client *clp; |
4697bd5e | 540 | int err; |
eee17325 | 541 | |
4697bd5e | 542 | restart: |
dc030858 | 543 | spin_lock(&nn->nfs_client_lock); |
6b13168b | 544 | list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { |
4697bd5e TM |
545 | /* Wait for initialisation to finish */ |
546 | if (clp->cl_cons_state == NFS_CS_INITING) { | |
547 | atomic_inc(&clp->cl_count); | |
548 | spin_unlock(&nn->nfs_client_lock); | |
549 | err = nfs_wait_client_init_complete(clp); | |
550 | nfs_put_client(clp); | |
551 | if (err) | |
552 | return NULL; | |
553 | goto restart; | |
554 | } | |
555 | /* Skip nfs_clients that failed to initialise */ | |
556 | if (clp->cl_cons_state < 0) | |
557 | continue; | |
54ac471c | 558 | smp_rmb(); |
eee17325 SK |
559 | if (clp->rpc_ops != &nfs_v4_clientops) |
560 | continue; | |
e9dbca8d SK |
561 | cl_dentry = clp->cl_idmap->idmap_pipe->dentry; |
562 | if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) || | |
563 | ((event == RPC_PIPEFS_UMOUNT) && !cl_dentry)) | |
564 | continue; | |
565 | atomic_inc(&clp->cl_count); | |
566 | spin_unlock(&nn->nfs_client_lock); | |
567 | return clp; | |
568 | } | |
569 | spin_unlock(&nn->nfs_client_lock); | |
570 | return NULL; | |
1da177e4 LT |
571 | } |
572 | ||
e9dbca8d SK |
573 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
574 | void *ptr) | |
1da177e4 | 575 | { |
e9dbca8d SK |
576 | struct super_block *sb = ptr; |
577 | struct nfs_client *clp; | |
578 | int error = 0; | |
1da177e4 | 579 | |
71dfc5fa SK |
580 | if (!try_module_get(THIS_MODULE)) |
581 | return 0; | |
582 | ||
e9dbca8d | 583 | while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) { |
eee17325 | 584 | error = __rpc_pipefs_event(clp, event, sb); |
e9dbca8d | 585 | nfs_put_client(clp); |
eee17325 SK |
586 | if (error) |
587 | break; | |
588 | } | |
71dfc5fa | 589 | module_put(THIS_MODULE); |
eee17325 | 590 | return error; |
1da177e4 LT |
591 | } |
592 | ||
eee17325 SK |
593 | #define PIPEFS_NFS_PRIO 1 |
594 | ||
595 | static struct notifier_block nfs_idmap_block = { | |
596 | .notifier_call = rpc_pipefs_event, | |
597 | .priority = SUNRPC_PIPEFS_NFS_PRIO, | |
598 | }; | |
1da177e4 | 599 | |
eee17325 | 600 | int nfs_idmap_init(void) |
1da177e4 | 601 | { |
e6499c6f BS |
602 | int ret; |
603 | ret = nfs_idmap_init_keyring(); | |
604 | if (ret != 0) | |
605 | goto out; | |
606 | ret = rpc_pipefs_notifier_register(&nfs_idmap_block); | |
607 | if (ret != 0) | |
608 | nfs_idmap_quit_keyring(); | |
609 | out: | |
610 | return ret; | |
1da177e4 LT |
611 | } |
612 | ||
eee17325 | 613 | void nfs_idmap_quit(void) |
1da177e4 | 614 | { |
eee17325 | 615 | rpc_pipefs_notifier_unregister(&nfs_idmap_block); |
e6499c6f | 616 | nfs_idmap_quit_keyring(); |
1da177e4 LT |
617 | } |
618 | ||
57e62324 BS |
619 | static int nfs_idmap_prepare_message(char *desc, struct idmap_msg *im, |
620 | struct rpc_pipe_msg *msg) | |
1da177e4 | 621 | { |
57e62324 BS |
622 | substring_t substr; |
623 | int token, ret; | |
1da177e4 | 624 | |
57e62324 BS |
625 | memset(im, 0, sizeof(*im)); |
626 | memset(msg, 0, sizeof(*msg)); | |
1da177e4 | 627 | |
57e62324 BS |
628 | im->im_type = IDMAP_TYPE_GROUP; |
629 | token = match_token(desc, nfs_idmap_tokens, &substr); | |
1da177e4 | 630 | |
57e62324 BS |
631 | switch (token) { |
632 | case Opt_find_uid: | |
633 | im->im_type = IDMAP_TYPE_USER; | |
634 | case Opt_find_gid: | |
635 | im->im_conv = IDMAP_CONV_NAMETOID; | |
636 | ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ); | |
637 | break; | |
1da177e4 | 638 | |
57e62324 BS |
639 | case Opt_find_user: |
640 | im->im_type = IDMAP_TYPE_USER; | |
641 | case Opt_find_group: | |
642 | im->im_conv = IDMAP_CONV_IDTONAME; | |
643 | ret = match_int(&substr, &im->im_id); | |
644 | break; | |
1da177e4 | 645 | |
57e62324 BS |
646 | default: |
647 | ret = -EINVAL; | |
1da177e4 LT |
648 | goto out; |
649 | } | |
650 | ||
57e62324 BS |
651 | msg->data = im; |
652 | msg->len = sizeof(struct idmap_msg); | |
1da177e4 | 653 | |
57e62324 | 654 | out: |
369af0f1 | 655 | return ret; |
1da177e4 LT |
656 | } |
657 | ||
57e62324 BS |
658 | static int nfs_idmap_legacy_upcall(struct key_construction *cons, |
659 | const char *op, | |
660 | void *aux) | |
1da177e4 | 661 | { |
57e62324 | 662 | struct rpc_pipe_msg *msg; |
1da177e4 | 663 | struct idmap_msg *im; |
57e62324 BS |
664 | struct idmap *idmap = (struct idmap *)aux; |
665 | struct key *key = cons->key; | |
5abc03cd | 666 | int ret = -ENOMEM; |
1da177e4 | 667 | |
57e62324 BS |
668 | /* msg and im are freed in idmap_pipe_destroy_msg */ |
669 | msg = kmalloc(sizeof(*msg), GFP_KERNEL); | |
5abc03cd | 670 | if (!msg) |
57e62324 | 671 | goto out0; |
1da177e4 | 672 | |
57e62324 | 673 | im = kmalloc(sizeof(*im), GFP_KERNEL); |
5abc03cd | 674 | if (!im) |
57e62324 | 675 | goto out1; |
1da177e4 | 676 | |
57e62324 BS |
677 | ret = nfs_idmap_prepare_message(key->description, im, msg); |
678 | if (ret < 0) | |
679 | goto out2; | |
1da177e4 | 680 | |
a427b9ec | 681 | BUG_ON(idmap->idmap_key_cons != NULL); |
57e62324 | 682 | idmap->idmap_key_cons = cons; |
1da177e4 | 683 | |
11588f49 BS |
684 | ret = rpc_queue_upcall(idmap->idmap_pipe, msg); |
685 | if (ret < 0) | |
686 | goto out2; | |
1da177e4 | 687 | |
11588f49 | 688 | return ret; |
57e62324 BS |
689 | |
690 | out2: | |
691 | kfree(im); | |
692 | out1: | |
693 | kfree(msg); | |
694 | out0: | |
a427b9ec | 695 | complete_request_key(cons, ret); |
369af0f1 | 696 | return ret; |
1da177e4 LT |
697 | } |
698 | ||
57e62324 | 699 | static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data) |
1da177e4 | 700 | { |
57e62324 BS |
701 | return key_instantiate_and_link(key, data, strlen(data) + 1, |
702 | id_resolver_cache->thread_keyring, | |
703 | authkey); | |
704 | } | |
1da177e4 | 705 | |
57e62324 BS |
706 | static int nfs_idmap_read_message(struct idmap_msg *im, struct key *key, struct key *authkey) |
707 | { | |
708 | char id_str[NFS_UINT_MAXLEN]; | |
709 | int ret = -EINVAL; | |
1da177e4 | 710 | |
57e62324 BS |
711 | switch (im->im_conv) { |
712 | case IDMAP_CONV_NAMETOID: | |
713 | sprintf(id_str, "%d", im->im_id); | |
714 | ret = nfs_idmap_instantiate(key, authkey, id_str); | |
715 | break; | |
716 | case IDMAP_CONV_IDTONAME: | |
717 | ret = nfs_idmap_instantiate(key, authkey, im->im_name); | |
718 | break; | |
1da177e4 LT |
719 | } |
720 | ||
1da177e4 LT |
721 | return ret; |
722 | } | |
723 | ||
1da177e4 LT |
724 | static ssize_t |
725 | idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
726 | { | |
369af0f1 | 727 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 | 728 | struct idmap *idmap = (struct idmap *)rpci->private; |
a427b9ec | 729 | struct key_construction *cons; |
57e62324 | 730 | struct idmap_msg im; |
d24aae41 | 731 | size_t namelen_in; |
1da177e4 LT |
732 | int ret; |
733 | ||
a427b9ec DH |
734 | /* If instantiation is successful, anyone waiting for key construction |
735 | * will have been woken up and someone else may now have used | |
736 | * idmap_key_cons - so after this point we may no longer touch it. | |
737 | */ | |
738 | cons = ACCESS_ONCE(idmap->idmap_key_cons); | |
739 | idmap->idmap_key_cons = NULL; | |
740 | ||
57e62324 BS |
741 | if (mlen != sizeof(im)) { |
742 | ret = -ENOSPC; | |
1da177e4 LT |
743 | goto out; |
744 | } | |
745 | ||
57e62324 BS |
746 | if (copy_from_user(&im, src, mlen) != 0) { |
747 | ret = -EFAULT; | |
1da177e4 | 748 | goto out; |
57e62324 | 749 | } |
1da177e4 | 750 | |
57e62324 BS |
751 | if (!(im.im_status & IDMAP_STATUS_SUCCESS)) { |
752 | ret = mlen; | |
a427b9ec | 753 | complete_request_key(cons, -ENOKEY); |
57e62324 | 754 | goto out_incomplete; |
1da177e4 LT |
755 | } |
756 | ||
57e62324 BS |
757 | namelen_in = strnlen(im.im_name, IDMAP_NAMESZ); |
758 | if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) { | |
759 | ret = -EINVAL; | |
1da177e4 LT |
760 | goto out; |
761 | } | |
762 | ||
57e62324 BS |
763 | ret = nfs_idmap_read_message(&im, cons->key, cons->authkey); |
764 | if (ret >= 0) { | |
765 | key_set_timeout(cons->key, nfs_idmap_cache_timeout); | |
766 | ret = mlen; | |
767 | } | |
768 | ||
1da177e4 | 769 | out: |
a427b9ec | 770 | complete_request_key(cons, ret); |
57e62324 | 771 | out_incomplete: |
1da177e4 LT |
772 | return ret; |
773 | } | |
774 | ||
75c96f85 | 775 | static void |
1da177e4 LT |
776 | idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
777 | { | |
57e62324 BS |
778 | /* Free memory allocated in nfs_idmap_legacy_upcall() */ |
779 | kfree(msg->data); | |
780 | kfree(msg); | |
1da177e4 LT |
781 | } |
782 | ||
e4fd72a1 | 783 | int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid) |
1da177e4 | 784 | { |
e4fd72a1 | 785 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 786 | |
5cf36cfd TM |
787 | if (nfs_map_string_to_numeric(name, namelen, uid)) |
788 | return 0; | |
57e62324 | 789 | return nfs_idmap_lookup_id(name, namelen, "uid", uid, idmap); |
1da177e4 LT |
790 | } |
791 | ||
e6499c6f | 792 | int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid) |
1da177e4 | 793 | { |
e4fd72a1 | 794 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 795 | |
e6499c6f | 796 | if (nfs_map_string_to_numeric(name, namelen, gid)) |
5cf36cfd | 797 | return 0; |
57e62324 | 798 | return nfs_idmap_lookup_id(name, namelen, "gid", gid, idmap); |
1da177e4 LT |
799 | } |
800 | ||
e4fd72a1 | 801 | int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen) |
1da177e4 | 802 | { |
e4fd72a1 | 803 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 804 | int ret = -EINVAL; |
1da177e4 | 805 | |
b064eca2 | 806 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
57e62324 | 807 | ret = nfs_idmap_lookup_name(uid, "user", buf, buflen, idmap); |
f0b85168 TM |
808 | if (ret < 0) |
809 | ret = nfs_map_numeric_to_string(uid, buf, buflen); | |
810 | return ret; | |
1da177e4 | 811 | } |
e6499c6f | 812 | int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen) |
1da177e4 | 813 | { |
e4fd72a1 | 814 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 815 | int ret = -EINVAL; |
1da177e4 | 816 | |
b064eca2 | 817 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
57e62324 | 818 | ret = nfs_idmap_lookup_name(gid, "group", buf, buflen, idmap); |
f0b85168 | 819 | if (ret < 0) |
e6499c6f | 820 | ret = nfs_map_numeric_to_string(gid, buf, buflen); |
f0b85168 | 821 | return ret; |
1da177e4 | 822 | } |