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 BS |
54 | |
55 | /* Default cache timeout is 10 minutes */ | |
57e62324 | 56 | unsigned int nfs_idmap_cache_timeout = 600; |
17280175 TM |
57 | static const struct cred *id_resolver_cache; |
58 | static struct key_type key_type_id_resolver_legacy; | |
3cd0f37a | 59 | |
b1027439 BS |
60 | struct idmap { |
61 | struct rpc_pipe *idmap_pipe; | |
62 | struct key_construction *idmap_key_cons; | |
63 | struct mutex idmap_mutex; | |
64 | }; | |
6926afd1 TM |
65 | |
66 | /** | |
67 | * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields | |
68 | * @fattr: fully initialised struct nfs_fattr | |
69 | * @owner_name: owner name string cache | |
70 | * @group_name: group name string cache | |
71 | */ | |
72 | void nfs_fattr_init_names(struct nfs_fattr *fattr, | |
73 | struct nfs4_string *owner_name, | |
74 | struct nfs4_string *group_name) | |
75 | { | |
76 | fattr->owner_name = owner_name; | |
77 | fattr->group_name = group_name; | |
78 | } | |
79 | ||
80 | static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr) | |
81 | { | |
82 | fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME; | |
83 | kfree(fattr->owner_name->data); | |
84 | } | |
85 | ||
86 | static void nfs_fattr_free_group_name(struct nfs_fattr *fattr) | |
87 | { | |
88 | fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME; | |
89 | kfree(fattr->group_name->data); | |
90 | } | |
91 | ||
92 | static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr) | |
93 | { | |
94 | struct nfs4_string *owner = fattr->owner_name; | |
95 | __u32 uid; | |
96 | ||
97 | if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)) | |
98 | return false; | |
99 | if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) { | |
100 | fattr->uid = uid; | |
101 | fattr->valid |= NFS_ATTR_FATTR_OWNER; | |
102 | } | |
103 | return true; | |
104 | } | |
105 | ||
106 | static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr) | |
107 | { | |
108 | struct nfs4_string *group = fattr->group_name; | |
109 | __u32 gid; | |
110 | ||
111 | if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)) | |
112 | return false; | |
113 | if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) { | |
114 | fattr->gid = gid; | |
115 | fattr->valid |= NFS_ATTR_FATTR_GROUP; | |
116 | } | |
117 | return true; | |
118 | } | |
119 | ||
120 | /** | |
121 | * nfs_fattr_free_names - free up the NFSv4 owner and group strings | |
122 | * @fattr: a fully initialised nfs_fattr structure | |
123 | */ | |
124 | void nfs_fattr_free_names(struct nfs_fattr *fattr) | |
125 | { | |
126 | if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME) | |
127 | nfs_fattr_free_owner_name(fattr); | |
128 | if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME) | |
129 | nfs_fattr_free_group_name(fattr); | |
130 | } | |
131 | ||
132 | /** | |
133 | * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free | |
134 | * @server: pointer to the filesystem nfs_server structure | |
135 | * @fattr: a fully initialised nfs_fattr structure | |
136 | * | |
137 | * This helper maps the cached NFSv4 owner/group strings in fattr into | |
138 | * their numeric uid/gid equivalents, and then frees the cached strings. | |
139 | */ | |
140 | void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr) | |
141 | { | |
142 | if (nfs_fattr_map_owner_name(server, fattr)) | |
143 | nfs_fattr_free_owner_name(fattr); | |
144 | if (nfs_fattr_map_group_name(server, fattr)) | |
145 | nfs_fattr_free_group_name(fattr); | |
146 | } | |
5cf36cfd TM |
147 | |
148 | static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res) | |
149 | { | |
150 | unsigned long val; | |
151 | char buf[16]; | |
152 | ||
153 | if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf)) | |
154 | return 0; | |
155 | memcpy(buf, name, namelen); | |
156 | buf[namelen] = '\0'; | |
157 | if (strict_strtoul(buf, 0, &val) != 0) | |
158 | return 0; | |
159 | *res = val; | |
160 | return 1; | |
161 | } | |
1da177e4 | 162 | |
f0b85168 TM |
163 | static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen) |
164 | { | |
165 | return snprintf(buf, buflen, "%u", id); | |
166 | } | |
167 | ||
17280175 | 168 | static struct key_type key_type_id_resolver = { |
955a857e BS |
169 | .name = "id_resolver", |
170 | .instantiate = user_instantiate, | |
171 | .match = user_match, | |
172 | .revoke = user_revoke, | |
173 | .destroy = user_destroy, | |
174 | .describe = user_describe, | |
175 | .read = user_read, | |
176 | }; | |
177 | ||
e6499c6f | 178 | static int nfs_idmap_init_keyring(void) |
955a857e BS |
179 | { |
180 | struct cred *cred; | |
181 | struct key *keyring; | |
182 | int ret = 0; | |
183 | ||
f9fd2d9c WAA |
184 | printk(KERN_NOTICE "NFS: Registering the %s key type\n", |
185 | key_type_id_resolver.name); | |
955a857e BS |
186 | |
187 | cred = prepare_kernel_cred(NULL); | |
188 | if (!cred) | |
189 | return -ENOMEM; | |
190 | ||
191 | keyring = key_alloc(&key_type_keyring, ".id_resolver", 0, 0, cred, | |
192 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
193 | KEY_USR_VIEW | KEY_USR_READ, | |
194 | KEY_ALLOC_NOT_IN_QUOTA); | |
195 | if (IS_ERR(keyring)) { | |
196 | ret = PTR_ERR(keyring); | |
197 | goto failed_put_cred; | |
198 | } | |
199 | ||
200 | ret = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL); | |
201 | if (ret < 0) | |
202 | goto failed_put_key; | |
203 | ||
204 | ret = register_key_type(&key_type_id_resolver); | |
205 | if (ret < 0) | |
206 | goto failed_put_key; | |
207 | ||
700920eb | 208 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
955a857e BS |
209 | cred->thread_keyring = keyring; |
210 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
211 | id_resolver_cache = cred; | |
212 | return 0; | |
213 | ||
214 | failed_put_key: | |
215 | key_put(keyring); | |
216 | failed_put_cred: | |
217 | put_cred(cred); | |
218 | return ret; | |
219 | } | |
220 | ||
e6499c6f | 221 | static void nfs_idmap_quit_keyring(void) |
955a857e BS |
222 | { |
223 | key_revoke(id_resolver_cache->thread_keyring); | |
224 | unregister_key_type(&key_type_id_resolver); | |
225 | put_cred(id_resolver_cache); | |
226 | } | |
227 | ||
228 | /* | |
229 | * Assemble the description to pass to request_key() | |
230 | * This function will allocate a new string and update dest to point | |
231 | * at it. The caller is responsible for freeing dest. | |
232 | * | |
233 | * On error 0 is returned. Otherwise, the length of dest is returned. | |
234 | */ | |
235 | static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen, | |
236 | const char *type, size_t typelen, char **desc) | |
237 | { | |
238 | char *cp; | |
239 | size_t desclen = typelen + namelen + 2; | |
240 | ||
241 | *desc = kmalloc(desclen, GFP_KERNEL); | |
8f0d97b4 | 242 | if (!*desc) |
955a857e BS |
243 | return -ENOMEM; |
244 | ||
245 | cp = *desc; | |
246 | memcpy(cp, type, typelen); | |
247 | cp += typelen; | |
248 | *cp++ = ':'; | |
249 | ||
250 | memcpy(cp, name, namelen); | |
251 | cp += namelen; | |
252 | *cp = '\0'; | |
253 | return desclen; | |
254 | } | |
255 | ||
57e62324 BS |
256 | static ssize_t nfs_idmap_request_key(struct key_type *key_type, |
257 | const char *name, size_t namelen, | |
258 | const char *type, void *data, | |
259 | size_t data_size, struct idmap *idmap) | |
955a857e BS |
260 | { |
261 | const struct cred *saved_cred; | |
262 | struct key *rkey; | |
263 | char *desc; | |
264 | struct user_key_payload *payload; | |
265 | ssize_t ret; | |
266 | ||
267 | ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc); | |
268 | if (ret <= 0) | |
269 | goto out; | |
270 | ||
271 | saved_cred = override_creds(id_resolver_cache); | |
57e62324 BS |
272 | if (idmap) |
273 | rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap); | |
274 | else | |
275 | rkey = request_key(&key_type_id_resolver, desc, ""); | |
955a857e | 276 | revert_creds(saved_cred); |
57e62324 | 277 | |
955a857e BS |
278 | kfree(desc); |
279 | if (IS_ERR(rkey)) { | |
280 | ret = PTR_ERR(rkey); | |
281 | goto out; | |
282 | } | |
283 | ||
284 | rcu_read_lock(); | |
285 | rkey->perm |= KEY_USR_VIEW; | |
286 | ||
287 | ret = key_validate(rkey); | |
288 | if (ret < 0) | |
289 | goto out_up; | |
290 | ||
291 | payload = rcu_dereference(rkey->payload.data); | |
292 | if (IS_ERR_OR_NULL(payload)) { | |
293 | ret = PTR_ERR(payload); | |
294 | goto out_up; | |
295 | } | |
296 | ||
297 | ret = payload->datalen; | |
298 | if (ret > 0 && ret <= data_size) | |
299 | memcpy(data, payload->data, ret); | |
300 | else | |
301 | ret = -EINVAL; | |
302 | ||
303 | out_up: | |
304 | rcu_read_unlock(); | |
305 | key_put(rkey); | |
306 | out: | |
307 | return ret; | |
308 | } | |
309 | ||
57e62324 BS |
310 | static ssize_t nfs_idmap_get_key(const char *name, size_t namelen, |
311 | const char *type, void *data, | |
312 | size_t data_size, struct idmap *idmap) | |
313 | { | |
314 | ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver, | |
315 | name, namelen, type, data, | |
316 | data_size, NULL); | |
317 | if (ret < 0) { | |
b1027439 | 318 | mutex_lock(&idmap->idmap_mutex); |
57e62324 BS |
319 | ret = nfs_idmap_request_key(&key_type_id_resolver_legacy, |
320 | name, namelen, type, data, | |
321 | data_size, idmap); | |
b1027439 | 322 | mutex_unlock(&idmap->idmap_mutex); |
57e62324 BS |
323 | } |
324 | return ret; | |
325 | } | |
955a857e BS |
326 | |
327 | /* ID -> Name */ | |
57e62324 BS |
328 | static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf, |
329 | size_t buflen, struct idmap *idmap) | |
955a857e BS |
330 | { |
331 | char id_str[NFS_UINT_MAXLEN]; | |
332 | int id_len; | |
333 | ssize_t ret; | |
334 | ||
335 | id_len = snprintf(id_str, sizeof(id_str), "%u", id); | |
57e62324 | 336 | ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap); |
955a857e BS |
337 | if (ret < 0) |
338 | return -EINVAL; | |
339 | return ret; | |
340 | } | |
341 | ||
342 | /* Name -> ID */ | |
57e62324 BS |
343 | static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type, |
344 | __u32 *id, struct idmap *idmap) | |
955a857e BS |
345 | { |
346 | char id_str[NFS_UINT_MAXLEN]; | |
347 | long id_long; | |
348 | ssize_t data_size; | |
349 | int ret = 0; | |
350 | ||
57e62324 | 351 | data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap); |
955a857e BS |
352 | if (data_size <= 0) { |
353 | ret = -EINVAL; | |
354 | } else { | |
355 | ret = strict_strtol(id_str, 10, &id_long); | |
356 | *id = (__u32)id_long; | |
357 | } | |
358 | return ret; | |
359 | } | |
360 | ||
e6499c6f | 361 | /* idmap classic begins here */ |
57e62324 | 362 | module_param(nfs_idmap_cache_timeout, int, 0644); |
f0b85168 | 363 | |
57e62324 BS |
364 | enum { |
365 | Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err | |
1da177e4 LT |
366 | }; |
367 | ||
57e62324 BS |
368 | static const match_table_t nfs_idmap_tokens = { |
369 | { Opt_find_uid, "uid:%s" }, | |
370 | { Opt_find_gid, "gid:%s" }, | |
371 | { Opt_find_user, "user:%s" }, | |
372 | { Opt_find_group, "group:%s" }, | |
373 | { Opt_find_err, NULL } | |
1da177e4 LT |
374 | }; |
375 | ||
57e62324 | 376 | static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *); |
369af0f1 CL |
377 | static ssize_t idmap_pipe_downcall(struct file *, const char __user *, |
378 | size_t); | |
379 | static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); | |
1da177e4 | 380 | |
b693ba4a | 381 | static const struct rpc_pipe_ops idmap_upcall_ops = { |
c1225158 | 382 | .upcall = rpc_pipe_generic_upcall, |
369af0f1 CL |
383 | .downcall = idmap_pipe_downcall, |
384 | .destroy_msg = idmap_pipe_destroy_msg, | |
1da177e4 LT |
385 | }; |
386 | ||
17280175 | 387 | static struct key_type key_type_id_resolver_legacy = { |
57e62324 BS |
388 | .name = "id_resolver", |
389 | .instantiate = user_instantiate, | |
390 | .match = user_match, | |
391 | .revoke = user_revoke, | |
392 | .destroy = user_destroy, | |
393 | .describe = user_describe, | |
394 | .read = user_read, | |
395 | .request_key = nfs_idmap_legacy_upcall, | |
396 | }; | |
397 | ||
4929d1d3 SK |
398 | static void __nfs_idmap_unregister(struct rpc_pipe *pipe) |
399 | { | |
400 | if (pipe->dentry) | |
401 | rpc_unlink(pipe->dentry); | |
402 | } | |
403 | ||
404 | static int __nfs_idmap_register(struct dentry *dir, | |
405 | struct idmap *idmap, | |
406 | struct rpc_pipe *pipe) | |
407 | { | |
408 | struct dentry *dentry; | |
409 | ||
410 | dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe); | |
411 | if (IS_ERR(dentry)) | |
412 | return PTR_ERR(dentry); | |
413 | pipe->dentry = dentry; | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static void nfs_idmap_unregister(struct nfs_client *clp, | |
418 | struct rpc_pipe *pipe) | |
419 | { | |
73ea666c | 420 | struct net *net = clp->cl_net; |
4929d1d3 SK |
421 | struct super_block *pipefs_sb; |
422 | ||
423 | pipefs_sb = rpc_get_sb_net(net); | |
424 | if (pipefs_sb) { | |
425 | __nfs_idmap_unregister(pipe); | |
426 | rpc_put_sb_net(net); | |
427 | } | |
428 | } | |
429 | ||
430 | static int nfs_idmap_register(struct nfs_client *clp, | |
431 | struct idmap *idmap, | |
432 | struct rpc_pipe *pipe) | |
433 | { | |
73ea666c | 434 | struct net *net = clp->cl_net; |
4929d1d3 SK |
435 | struct super_block *pipefs_sb; |
436 | int err = 0; | |
437 | ||
438 | pipefs_sb = rpc_get_sb_net(net); | |
439 | if (pipefs_sb) { | |
440 | if (clp->cl_rpcclient->cl_dentry) | |
441 | err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry, | |
442 | idmap, pipe); | |
443 | rpc_put_sb_net(net); | |
444 | } | |
445 | return err; | |
446 | } | |
447 | ||
b7162792 | 448 | int |
adfa6f98 | 449 | nfs_idmap_new(struct nfs_client *clp) |
1da177e4 LT |
450 | { |
451 | struct idmap *idmap; | |
c239d83b | 452 | struct rpc_pipe *pipe; |
b7162792 | 453 | int error; |
1da177e4 | 454 | |
54ceac45 | 455 | BUG_ON(clp->cl_idmap != NULL); |
b7162792 | 456 | |
369af0f1 CL |
457 | idmap = kzalloc(sizeof(*idmap), GFP_KERNEL); |
458 | if (idmap == NULL) | |
459 | return -ENOMEM; | |
1da177e4 | 460 | |
c239d83b SK |
461 | pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0); |
462 | if (IS_ERR(pipe)) { | |
463 | error = PTR_ERR(pipe); | |
1da177e4 | 464 | kfree(idmap); |
b7162792 | 465 | return error; |
1da177e4 | 466 | } |
4929d1d3 SK |
467 | error = nfs_idmap_register(clp, idmap, pipe); |
468 | if (error) { | |
c239d83b SK |
469 | rpc_destroy_pipe_data(pipe); |
470 | kfree(idmap); | |
471 | return error; | |
472 | } | |
473 | idmap->idmap_pipe = pipe; | |
b1027439 | 474 | mutex_init(&idmap->idmap_mutex); |
1da177e4 LT |
475 | |
476 | clp->cl_idmap = idmap; | |
b7162792 | 477 | return 0; |
1da177e4 LT |
478 | } |
479 | ||
480 | void | |
adfa6f98 | 481 | nfs_idmap_delete(struct nfs_client *clp) |
1da177e4 LT |
482 | { |
483 | struct idmap *idmap = clp->cl_idmap; | |
484 | ||
485 | if (!idmap) | |
486 | return; | |
4929d1d3 | 487 | nfs_idmap_unregister(clp, idmap->idmap_pipe); |
c239d83b | 488 | rpc_destroy_pipe_data(idmap->idmap_pipe); |
1da177e4 LT |
489 | clp->cl_idmap = NULL; |
490 | kfree(idmap); | |
491 | } | |
492 | ||
eee17325 SK |
493 | static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event, |
494 | struct super_block *sb) | |
1da177e4 | 495 | { |
eee17325 | 496 | int err = 0; |
1da177e4 | 497 | |
eee17325 SK |
498 | switch (event) { |
499 | case RPC_PIPEFS_MOUNT: | |
500 | BUG_ON(clp->cl_rpcclient->cl_dentry == NULL); | |
501 | err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry, | |
502 | clp->cl_idmap, | |
503 | clp->cl_idmap->idmap_pipe); | |
504 | break; | |
505 | case RPC_PIPEFS_UMOUNT: | |
506 | if (clp->cl_idmap->idmap_pipe) { | |
507 | struct dentry *parent; | |
508 | ||
509 | parent = clp->cl_idmap->idmap_pipe->dentry->d_parent; | |
510 | __nfs_idmap_unregister(clp->cl_idmap->idmap_pipe); | |
511 | /* | |
512 | * Note: This is a dirty hack. SUNRPC hook has been | |
513 | * called already but simple_rmdir() call for the | |
514 | * directory returned with error because of idmap pipe | |
515 | * inside. Thus now we have to remove this directory | |
516 | * here. | |
517 | */ | |
518 | if (rpc_rmdir(parent)) | |
a030889a WAA |
519 | printk(KERN_ERR "NFS: %s: failed to remove " |
520 | "clnt dir!\n", __func__); | |
eee17325 SK |
521 | } |
522 | break; | |
523 | default: | |
a030889a WAA |
524 | printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__, |
525 | event); | |
eee17325 SK |
526 | return -ENOTSUPP; |
527 | } | |
528 | return err; | |
529 | } | |
530 | ||
e9dbca8d | 531 | static struct nfs_client *nfs_get_client_for_event(struct net *net, int event) |
eee17325 | 532 | { |
e9dbca8d SK |
533 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
534 | struct dentry *cl_dentry; | |
eee17325 | 535 | struct nfs_client *clp; |
4697bd5e | 536 | int err; |
eee17325 | 537 | |
4697bd5e | 538 | restart: |
dc030858 | 539 | spin_lock(&nn->nfs_client_lock); |
6b13168b | 540 | list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { |
4697bd5e TM |
541 | /* Wait for initialisation to finish */ |
542 | if (clp->cl_cons_state == NFS_CS_INITING) { | |
543 | atomic_inc(&clp->cl_count); | |
544 | spin_unlock(&nn->nfs_client_lock); | |
545 | err = nfs_wait_client_init_complete(clp); | |
546 | nfs_put_client(clp); | |
547 | if (err) | |
548 | return NULL; | |
549 | goto restart; | |
550 | } | |
551 | /* Skip nfs_clients that failed to initialise */ | |
552 | if (clp->cl_cons_state < 0) | |
553 | continue; | |
54ac471c | 554 | smp_rmb(); |
eee17325 SK |
555 | if (clp->rpc_ops != &nfs_v4_clientops) |
556 | continue; | |
e9dbca8d SK |
557 | cl_dentry = clp->cl_idmap->idmap_pipe->dentry; |
558 | if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) || | |
559 | ((event == RPC_PIPEFS_UMOUNT) && !cl_dentry)) | |
560 | continue; | |
561 | atomic_inc(&clp->cl_count); | |
562 | spin_unlock(&nn->nfs_client_lock); | |
563 | return clp; | |
564 | } | |
565 | spin_unlock(&nn->nfs_client_lock); | |
566 | return NULL; | |
1da177e4 LT |
567 | } |
568 | ||
e9dbca8d SK |
569 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
570 | void *ptr) | |
1da177e4 | 571 | { |
e9dbca8d SK |
572 | struct super_block *sb = ptr; |
573 | struct nfs_client *clp; | |
574 | int error = 0; | |
1da177e4 | 575 | |
71dfc5fa SK |
576 | if (!try_module_get(THIS_MODULE)) |
577 | return 0; | |
578 | ||
e9dbca8d | 579 | while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) { |
eee17325 | 580 | error = __rpc_pipefs_event(clp, event, sb); |
e9dbca8d | 581 | nfs_put_client(clp); |
eee17325 SK |
582 | if (error) |
583 | break; | |
584 | } | |
71dfc5fa | 585 | module_put(THIS_MODULE); |
eee17325 | 586 | return error; |
1da177e4 LT |
587 | } |
588 | ||
eee17325 SK |
589 | #define PIPEFS_NFS_PRIO 1 |
590 | ||
591 | static struct notifier_block nfs_idmap_block = { | |
592 | .notifier_call = rpc_pipefs_event, | |
593 | .priority = SUNRPC_PIPEFS_NFS_PRIO, | |
594 | }; | |
1da177e4 | 595 | |
eee17325 | 596 | int nfs_idmap_init(void) |
1da177e4 | 597 | { |
e6499c6f BS |
598 | int ret; |
599 | ret = nfs_idmap_init_keyring(); | |
600 | if (ret != 0) | |
601 | goto out; | |
602 | ret = rpc_pipefs_notifier_register(&nfs_idmap_block); | |
603 | if (ret != 0) | |
604 | nfs_idmap_quit_keyring(); | |
605 | out: | |
606 | return ret; | |
1da177e4 LT |
607 | } |
608 | ||
eee17325 | 609 | void nfs_idmap_quit(void) |
1da177e4 | 610 | { |
eee17325 | 611 | rpc_pipefs_notifier_unregister(&nfs_idmap_block); |
e6499c6f | 612 | nfs_idmap_quit_keyring(); |
1da177e4 LT |
613 | } |
614 | ||
57e62324 BS |
615 | static int nfs_idmap_prepare_message(char *desc, struct idmap_msg *im, |
616 | struct rpc_pipe_msg *msg) | |
1da177e4 | 617 | { |
57e62324 BS |
618 | substring_t substr; |
619 | int token, ret; | |
1da177e4 | 620 | |
57e62324 BS |
621 | memset(im, 0, sizeof(*im)); |
622 | memset(msg, 0, sizeof(*msg)); | |
1da177e4 | 623 | |
57e62324 BS |
624 | im->im_type = IDMAP_TYPE_GROUP; |
625 | token = match_token(desc, nfs_idmap_tokens, &substr); | |
1da177e4 | 626 | |
57e62324 BS |
627 | switch (token) { |
628 | case Opt_find_uid: | |
629 | im->im_type = IDMAP_TYPE_USER; | |
630 | case Opt_find_gid: | |
631 | im->im_conv = IDMAP_CONV_NAMETOID; | |
632 | ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ); | |
633 | break; | |
1da177e4 | 634 | |
57e62324 BS |
635 | case Opt_find_user: |
636 | im->im_type = IDMAP_TYPE_USER; | |
637 | case Opt_find_group: | |
638 | im->im_conv = IDMAP_CONV_IDTONAME; | |
639 | ret = match_int(&substr, &im->im_id); | |
640 | break; | |
1da177e4 | 641 | |
57e62324 BS |
642 | default: |
643 | ret = -EINVAL; | |
1da177e4 LT |
644 | goto out; |
645 | } | |
646 | ||
57e62324 BS |
647 | msg->data = im; |
648 | msg->len = sizeof(struct idmap_msg); | |
1da177e4 | 649 | |
57e62324 | 650 | out: |
369af0f1 | 651 | return ret; |
1da177e4 LT |
652 | } |
653 | ||
57e62324 BS |
654 | static int nfs_idmap_legacy_upcall(struct key_construction *cons, |
655 | const char *op, | |
656 | void *aux) | |
1da177e4 | 657 | { |
57e62324 | 658 | struct rpc_pipe_msg *msg; |
1da177e4 | 659 | struct idmap_msg *im; |
57e62324 BS |
660 | struct idmap *idmap = (struct idmap *)aux; |
661 | struct key *key = cons->key; | |
5abc03cd | 662 | int ret = -ENOMEM; |
1da177e4 | 663 | |
57e62324 BS |
664 | /* msg and im are freed in idmap_pipe_destroy_msg */ |
665 | msg = kmalloc(sizeof(*msg), GFP_KERNEL); | |
5abc03cd | 666 | if (!msg) |
57e62324 | 667 | goto out0; |
1da177e4 | 668 | |
57e62324 | 669 | im = kmalloc(sizeof(*im), GFP_KERNEL); |
5abc03cd | 670 | if (!im) |
57e62324 | 671 | goto out1; |
1da177e4 | 672 | |
57e62324 BS |
673 | ret = nfs_idmap_prepare_message(key->description, im, msg); |
674 | if (ret < 0) | |
675 | goto out2; | |
1da177e4 | 676 | |
57e62324 | 677 | idmap->idmap_key_cons = cons; |
1da177e4 | 678 | |
11588f49 BS |
679 | ret = rpc_queue_upcall(idmap->idmap_pipe, msg); |
680 | if (ret < 0) | |
681 | goto out2; | |
1da177e4 | 682 | |
11588f49 | 683 | return ret; |
57e62324 BS |
684 | |
685 | out2: | |
686 | kfree(im); | |
687 | out1: | |
688 | kfree(msg); | |
689 | out0: | |
11588f49 BS |
690 | key_revoke(cons->key); |
691 | key_revoke(cons->authkey); | |
369af0f1 | 692 | return ret; |
1da177e4 LT |
693 | } |
694 | ||
57e62324 | 695 | static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data) |
1da177e4 | 696 | { |
57e62324 BS |
697 | return key_instantiate_and_link(key, data, strlen(data) + 1, |
698 | id_resolver_cache->thread_keyring, | |
699 | authkey); | |
700 | } | |
1da177e4 | 701 | |
57e62324 BS |
702 | static int nfs_idmap_read_message(struct idmap_msg *im, struct key *key, struct key *authkey) |
703 | { | |
704 | char id_str[NFS_UINT_MAXLEN]; | |
705 | int ret = -EINVAL; | |
1da177e4 | 706 | |
57e62324 BS |
707 | switch (im->im_conv) { |
708 | case IDMAP_CONV_NAMETOID: | |
709 | sprintf(id_str, "%d", im->im_id); | |
710 | ret = nfs_idmap_instantiate(key, authkey, id_str); | |
711 | break; | |
712 | case IDMAP_CONV_IDTONAME: | |
713 | ret = nfs_idmap_instantiate(key, authkey, im->im_name); | |
714 | break; | |
1da177e4 LT |
715 | } |
716 | ||
1da177e4 LT |
717 | return ret; |
718 | } | |
719 | ||
1da177e4 LT |
720 | static ssize_t |
721 | idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
722 | { | |
369af0f1 | 723 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 | 724 | struct idmap *idmap = (struct idmap *)rpci->private; |
57e62324 BS |
725 | struct key_construction *cons = idmap->idmap_key_cons; |
726 | struct idmap_msg im; | |
d24aae41 | 727 | size_t namelen_in; |
1da177e4 LT |
728 | int ret; |
729 | ||
57e62324 BS |
730 | if (mlen != sizeof(im)) { |
731 | ret = -ENOSPC; | |
1da177e4 LT |
732 | goto out; |
733 | } | |
734 | ||
57e62324 BS |
735 | if (copy_from_user(&im, src, mlen) != 0) { |
736 | ret = -EFAULT; | |
1da177e4 | 737 | goto out; |
57e62324 | 738 | } |
1da177e4 | 739 | |
57e62324 BS |
740 | if (!(im.im_status & IDMAP_STATUS_SUCCESS)) { |
741 | ret = mlen; | |
742 | complete_request_key(idmap->idmap_key_cons, -ENOKEY); | |
743 | goto out_incomplete; | |
1da177e4 LT |
744 | } |
745 | ||
57e62324 BS |
746 | namelen_in = strnlen(im.im_name, IDMAP_NAMESZ); |
747 | if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) { | |
748 | ret = -EINVAL; | |
1da177e4 LT |
749 | goto out; |
750 | } | |
751 | ||
57e62324 BS |
752 | ret = nfs_idmap_read_message(&im, cons->key, cons->authkey); |
753 | if (ret >= 0) { | |
754 | key_set_timeout(cons->key, nfs_idmap_cache_timeout); | |
755 | ret = mlen; | |
756 | } | |
757 | ||
1da177e4 | 758 | out: |
57e62324 BS |
759 | complete_request_key(idmap->idmap_key_cons, ret); |
760 | out_incomplete: | |
1da177e4 LT |
761 | return ret; |
762 | } | |
763 | ||
75c96f85 | 764 | static void |
1da177e4 LT |
765 | idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
766 | { | |
57e62324 BS |
767 | /* Free memory allocated in nfs_idmap_legacy_upcall() */ |
768 | kfree(msg->data); | |
769 | kfree(msg); | |
1da177e4 LT |
770 | } |
771 | ||
e4fd72a1 | 772 | int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid) |
1da177e4 | 773 | { |
e4fd72a1 | 774 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 775 | |
5cf36cfd TM |
776 | if (nfs_map_string_to_numeric(name, namelen, uid)) |
777 | return 0; | |
57e62324 | 778 | return nfs_idmap_lookup_id(name, namelen, "uid", uid, idmap); |
1da177e4 LT |
779 | } |
780 | ||
e6499c6f | 781 | int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid) |
1da177e4 | 782 | { |
e4fd72a1 | 783 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 784 | |
e6499c6f | 785 | if (nfs_map_string_to_numeric(name, namelen, gid)) |
5cf36cfd | 786 | return 0; |
57e62324 | 787 | return nfs_idmap_lookup_id(name, namelen, "gid", gid, idmap); |
1da177e4 LT |
788 | } |
789 | ||
e4fd72a1 | 790 | int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen) |
1da177e4 | 791 | { |
e4fd72a1 | 792 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 793 | int ret = -EINVAL; |
1da177e4 | 794 | |
b064eca2 | 795 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
57e62324 | 796 | ret = nfs_idmap_lookup_name(uid, "user", buf, buflen, idmap); |
f0b85168 TM |
797 | if (ret < 0) |
798 | ret = nfs_map_numeric_to_string(uid, buf, buflen); | |
799 | return ret; | |
1da177e4 | 800 | } |
e6499c6f | 801 | int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, 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(gid, "group", buf, buflen, idmap); |
f0b85168 | 808 | if (ret < 0) |
e6499c6f | 809 | ret = nfs_map_numeric_to_string(gid, buf, buflen); |
f0b85168 | 810 | return ret; |
1da177e4 | 811 | } |