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 | |
c5066945 BS |
58 | struct idmap_legacy_upcalldata { |
59 | struct rpc_pipe_msg pipe_msg; | |
60 | struct idmap_msg idmap_msg; | |
0cac1202 | 61 | struct key_construction *key_cons; |
c5066945 BS |
62 | struct idmap *idmap; |
63 | }; | |
64 | ||
0cac1202 TM |
65 | struct idmap { |
66 | struct rpc_pipe *idmap_pipe; | |
67 | struct idmap_legacy_upcalldata *idmap_upcall_data; | |
68 | struct mutex idmap_mutex; | |
69 | }; | |
70 | ||
6926afd1 TM |
71 | /** |
72 | * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields | |
73 | * @fattr: fully initialised struct nfs_fattr | |
74 | * @owner_name: owner name string cache | |
75 | * @group_name: group name string cache | |
76 | */ | |
77 | void nfs_fattr_init_names(struct nfs_fattr *fattr, | |
78 | struct nfs4_string *owner_name, | |
79 | struct nfs4_string *group_name) | |
80 | { | |
81 | fattr->owner_name = owner_name; | |
82 | fattr->group_name = group_name; | |
83 | } | |
84 | ||
85 | static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr) | |
86 | { | |
87 | fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME; | |
88 | kfree(fattr->owner_name->data); | |
89 | } | |
90 | ||
91 | static void nfs_fattr_free_group_name(struct nfs_fattr *fattr) | |
92 | { | |
93 | fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME; | |
94 | kfree(fattr->group_name->data); | |
95 | } | |
96 | ||
97 | static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr) | |
98 | { | |
99 | struct nfs4_string *owner = fattr->owner_name; | |
100 | __u32 uid; | |
101 | ||
102 | if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)) | |
103 | return false; | |
104 | if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) { | |
105 | fattr->uid = uid; | |
106 | fattr->valid |= NFS_ATTR_FATTR_OWNER; | |
107 | } | |
108 | return true; | |
109 | } | |
110 | ||
111 | static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr) | |
112 | { | |
113 | struct nfs4_string *group = fattr->group_name; | |
114 | __u32 gid; | |
115 | ||
116 | if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)) | |
117 | return false; | |
118 | if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) { | |
119 | fattr->gid = gid; | |
120 | fattr->valid |= NFS_ATTR_FATTR_GROUP; | |
121 | } | |
122 | return true; | |
123 | } | |
124 | ||
125 | /** | |
126 | * nfs_fattr_free_names - free up the NFSv4 owner and group strings | |
127 | * @fattr: a fully initialised nfs_fattr structure | |
128 | */ | |
129 | void nfs_fattr_free_names(struct nfs_fattr *fattr) | |
130 | { | |
131 | if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME) | |
132 | nfs_fattr_free_owner_name(fattr); | |
133 | if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME) | |
134 | nfs_fattr_free_group_name(fattr); | |
135 | } | |
136 | ||
137 | /** | |
138 | * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free | |
139 | * @server: pointer to the filesystem nfs_server structure | |
140 | * @fattr: a fully initialised nfs_fattr structure | |
141 | * | |
142 | * This helper maps the cached NFSv4 owner/group strings in fattr into | |
143 | * their numeric uid/gid equivalents, and then frees the cached strings. | |
144 | */ | |
145 | void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr) | |
146 | { | |
147 | if (nfs_fattr_map_owner_name(server, fattr)) | |
148 | nfs_fattr_free_owner_name(fattr); | |
149 | if (nfs_fattr_map_group_name(server, fattr)) | |
150 | nfs_fattr_free_group_name(fattr); | |
151 | } | |
5cf36cfd TM |
152 | |
153 | static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res) | |
154 | { | |
155 | unsigned long val; | |
156 | char buf[16]; | |
157 | ||
158 | if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf)) | |
159 | return 0; | |
160 | memcpy(buf, name, namelen); | |
161 | buf[namelen] = '\0'; | |
7297cb68 | 162 | if (kstrtoul(buf, 0, &val) != 0) |
5cf36cfd TM |
163 | return 0; |
164 | *res = val; | |
165 | return 1; | |
166 | } | |
1da177e4 | 167 | |
f0b85168 TM |
168 | static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen) |
169 | { | |
170 | return snprintf(buf, buflen, "%u", id); | |
171 | } | |
172 | ||
17280175 | 173 | static struct key_type key_type_id_resolver = { |
955a857e BS |
174 | .name = "id_resolver", |
175 | .instantiate = user_instantiate, | |
176 | .match = user_match, | |
177 | .revoke = user_revoke, | |
178 | .destroy = user_destroy, | |
179 | .describe = user_describe, | |
180 | .read = user_read, | |
181 | }; | |
182 | ||
e6499c6f | 183 | static int nfs_idmap_init_keyring(void) |
955a857e BS |
184 | { |
185 | struct cred *cred; | |
186 | struct key *keyring; | |
187 | int ret = 0; | |
188 | ||
f9fd2d9c WAA |
189 | printk(KERN_NOTICE "NFS: Registering the %s key type\n", |
190 | key_type_id_resolver.name); | |
955a857e BS |
191 | |
192 | cred = prepare_kernel_cred(NULL); | |
193 | if (!cred) | |
194 | return -ENOMEM; | |
195 | ||
196 | keyring = key_alloc(&key_type_keyring, ".id_resolver", 0, 0, cred, | |
197 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
198 | KEY_USR_VIEW | KEY_USR_READ, | |
199 | KEY_ALLOC_NOT_IN_QUOTA); | |
200 | if (IS_ERR(keyring)) { | |
201 | ret = PTR_ERR(keyring); | |
202 | goto failed_put_cred; | |
203 | } | |
204 | ||
205 | ret = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL); | |
206 | if (ret < 0) | |
207 | goto failed_put_key; | |
208 | ||
209 | ret = register_key_type(&key_type_id_resolver); | |
210 | if (ret < 0) | |
211 | goto failed_put_key; | |
212 | ||
a427b9ec DH |
213 | ret = register_key_type(&key_type_id_resolver_legacy); |
214 | if (ret < 0) | |
215 | goto failed_reg_legacy; | |
216 | ||
700920eb | 217 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
955a857e BS |
218 | cred->thread_keyring = keyring; |
219 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
220 | id_resolver_cache = cred; | |
221 | return 0; | |
222 | ||
a427b9ec DH |
223 | failed_reg_legacy: |
224 | unregister_key_type(&key_type_id_resolver); | |
955a857e BS |
225 | failed_put_key: |
226 | key_put(keyring); | |
227 | failed_put_cred: | |
228 | put_cred(cred); | |
229 | return ret; | |
230 | } | |
231 | ||
e6499c6f | 232 | static void nfs_idmap_quit_keyring(void) |
955a857e BS |
233 | { |
234 | key_revoke(id_resolver_cache->thread_keyring); | |
235 | unregister_key_type(&key_type_id_resolver); | |
a427b9ec | 236 | unregister_key_type(&key_type_id_resolver_legacy); |
955a857e BS |
237 | put_cred(id_resolver_cache); |
238 | } | |
239 | ||
240 | /* | |
241 | * Assemble the description to pass to request_key() | |
242 | * This function will allocate a new string and update dest to point | |
243 | * at it. The caller is responsible for freeing dest. | |
244 | * | |
245 | * On error 0 is returned. Otherwise, the length of dest is returned. | |
246 | */ | |
247 | static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen, | |
248 | const char *type, size_t typelen, char **desc) | |
249 | { | |
250 | char *cp; | |
251 | size_t desclen = typelen + namelen + 2; | |
252 | ||
253 | *desc = kmalloc(desclen, GFP_KERNEL); | |
8f0d97b4 | 254 | if (!*desc) |
955a857e BS |
255 | return -ENOMEM; |
256 | ||
257 | cp = *desc; | |
258 | memcpy(cp, type, typelen); | |
259 | cp += typelen; | |
260 | *cp++ = ':'; | |
261 | ||
262 | memcpy(cp, name, namelen); | |
263 | cp += namelen; | |
264 | *cp = '\0'; | |
265 | return desclen; | |
266 | } | |
267 | ||
57e62324 BS |
268 | static ssize_t nfs_idmap_request_key(struct key_type *key_type, |
269 | const char *name, size_t namelen, | |
270 | const char *type, void *data, | |
271 | size_t data_size, struct idmap *idmap) | |
955a857e BS |
272 | { |
273 | const struct cred *saved_cred; | |
274 | struct key *rkey; | |
275 | char *desc; | |
276 | struct user_key_payload *payload; | |
277 | ssize_t ret; | |
278 | ||
279 | ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc); | |
280 | if (ret <= 0) | |
281 | goto out; | |
282 | ||
283 | saved_cred = override_creds(id_resolver_cache); | |
57e62324 BS |
284 | if (idmap) |
285 | rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap); | |
286 | else | |
287 | rkey = request_key(&key_type_id_resolver, desc, ""); | |
955a857e | 288 | revert_creds(saved_cred); |
57e62324 | 289 | |
955a857e BS |
290 | kfree(desc); |
291 | if (IS_ERR(rkey)) { | |
292 | ret = PTR_ERR(rkey); | |
293 | goto out; | |
294 | } | |
295 | ||
296 | rcu_read_lock(); | |
297 | rkey->perm |= KEY_USR_VIEW; | |
298 | ||
299 | ret = key_validate(rkey); | |
300 | if (ret < 0) | |
301 | goto out_up; | |
302 | ||
303 | payload = rcu_dereference(rkey->payload.data); | |
304 | if (IS_ERR_OR_NULL(payload)) { | |
305 | ret = PTR_ERR(payload); | |
306 | goto out_up; | |
307 | } | |
308 | ||
309 | ret = payload->datalen; | |
310 | if (ret > 0 && ret <= data_size) | |
311 | memcpy(data, payload->data, ret); | |
312 | else | |
313 | ret = -EINVAL; | |
314 | ||
315 | out_up: | |
316 | rcu_read_unlock(); | |
317 | key_put(rkey); | |
318 | out: | |
319 | return ret; | |
320 | } | |
321 | ||
57e62324 BS |
322 | static ssize_t nfs_idmap_get_key(const char *name, size_t namelen, |
323 | const char *type, void *data, | |
324 | size_t data_size, struct idmap *idmap) | |
325 | { | |
326 | ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver, | |
327 | name, namelen, type, data, | |
328 | data_size, NULL); | |
329 | if (ret < 0) { | |
b1027439 | 330 | mutex_lock(&idmap->idmap_mutex); |
57e62324 BS |
331 | ret = nfs_idmap_request_key(&key_type_id_resolver_legacy, |
332 | name, namelen, type, data, | |
333 | data_size, idmap); | |
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 { | |
7297cb68 | 367 | ret = kstrtol(id_str, 10, &id_long); |
955a857e BS |
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 | |
369af0f1 CL |
468 | idmap = kzalloc(sizeof(*idmap), GFP_KERNEL); |
469 | if (idmap == NULL) | |
470 | return -ENOMEM; | |
1da177e4 | 471 | |
c239d83b SK |
472 | pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0); |
473 | if (IS_ERR(pipe)) { | |
474 | error = PTR_ERR(pipe); | |
1da177e4 | 475 | kfree(idmap); |
b7162792 | 476 | return error; |
1da177e4 | 477 | } |
4929d1d3 SK |
478 | error = nfs_idmap_register(clp, idmap, pipe); |
479 | if (error) { | |
c239d83b SK |
480 | rpc_destroy_pipe_data(pipe); |
481 | kfree(idmap); | |
482 | return error; | |
483 | } | |
484 | idmap->idmap_pipe = pipe; | |
b1027439 | 485 | mutex_init(&idmap->idmap_mutex); |
1da177e4 LT |
486 | |
487 | clp->cl_idmap = idmap; | |
b7162792 | 488 | return 0; |
1da177e4 LT |
489 | } |
490 | ||
491 | void | |
adfa6f98 | 492 | nfs_idmap_delete(struct nfs_client *clp) |
1da177e4 LT |
493 | { |
494 | struct idmap *idmap = clp->cl_idmap; | |
495 | ||
496 | if (!idmap) | |
497 | return; | |
4929d1d3 | 498 | nfs_idmap_unregister(clp, idmap->idmap_pipe); |
c239d83b | 499 | rpc_destroy_pipe_data(idmap->idmap_pipe); |
1da177e4 LT |
500 | clp->cl_idmap = NULL; |
501 | kfree(idmap); | |
502 | } | |
503 | ||
eee17325 SK |
504 | static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event, |
505 | struct super_block *sb) | |
1da177e4 | 506 | { |
eee17325 | 507 | int err = 0; |
1da177e4 | 508 | |
eee17325 SK |
509 | switch (event) { |
510 | case RPC_PIPEFS_MOUNT: | |
eee17325 SK |
511 | err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry, |
512 | clp->cl_idmap, | |
513 | clp->cl_idmap->idmap_pipe); | |
514 | break; | |
515 | case RPC_PIPEFS_UMOUNT: | |
516 | if (clp->cl_idmap->idmap_pipe) { | |
517 | struct dentry *parent; | |
518 | ||
519 | parent = clp->cl_idmap->idmap_pipe->dentry->d_parent; | |
520 | __nfs_idmap_unregister(clp->cl_idmap->idmap_pipe); | |
521 | /* | |
522 | * Note: This is a dirty hack. SUNRPC hook has been | |
523 | * called already but simple_rmdir() call for the | |
524 | * directory returned with error because of idmap pipe | |
525 | * inside. Thus now we have to remove this directory | |
526 | * here. | |
527 | */ | |
528 | if (rpc_rmdir(parent)) | |
a030889a WAA |
529 | printk(KERN_ERR "NFS: %s: failed to remove " |
530 | "clnt dir!\n", __func__); | |
eee17325 SK |
531 | } |
532 | break; | |
533 | default: | |
a030889a WAA |
534 | printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__, |
535 | event); | |
eee17325 SK |
536 | return -ENOTSUPP; |
537 | } | |
538 | return err; | |
539 | } | |
540 | ||
e9dbca8d | 541 | static struct nfs_client *nfs_get_client_for_event(struct net *net, int event) |
eee17325 | 542 | { |
e9dbca8d SK |
543 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
544 | struct dentry *cl_dentry; | |
eee17325 | 545 | struct nfs_client *clp; |
4697bd5e | 546 | int err; |
eee17325 | 547 | |
4697bd5e | 548 | restart: |
dc030858 | 549 | spin_lock(&nn->nfs_client_lock); |
6b13168b | 550 | list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { |
4697bd5e TM |
551 | /* Wait for initialisation to finish */ |
552 | if (clp->cl_cons_state == NFS_CS_INITING) { | |
553 | atomic_inc(&clp->cl_count); | |
554 | spin_unlock(&nn->nfs_client_lock); | |
555 | err = nfs_wait_client_init_complete(clp); | |
556 | nfs_put_client(clp); | |
557 | if (err) | |
558 | return NULL; | |
559 | goto restart; | |
560 | } | |
561 | /* Skip nfs_clients that failed to initialise */ | |
562 | if (clp->cl_cons_state < 0) | |
563 | continue; | |
54ac471c | 564 | smp_rmb(); |
eee17325 SK |
565 | if (clp->rpc_ops != &nfs_v4_clientops) |
566 | continue; | |
e9dbca8d SK |
567 | cl_dentry = clp->cl_idmap->idmap_pipe->dentry; |
568 | if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) || | |
569 | ((event == RPC_PIPEFS_UMOUNT) && !cl_dentry)) | |
570 | continue; | |
571 | atomic_inc(&clp->cl_count); | |
572 | spin_unlock(&nn->nfs_client_lock); | |
573 | return clp; | |
574 | } | |
575 | spin_unlock(&nn->nfs_client_lock); | |
576 | return NULL; | |
1da177e4 LT |
577 | } |
578 | ||
e9dbca8d SK |
579 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
580 | void *ptr) | |
1da177e4 | 581 | { |
e9dbca8d SK |
582 | struct super_block *sb = ptr; |
583 | struct nfs_client *clp; | |
584 | int error = 0; | |
1da177e4 | 585 | |
71dfc5fa SK |
586 | if (!try_module_get(THIS_MODULE)) |
587 | return 0; | |
588 | ||
e9dbca8d | 589 | while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) { |
eee17325 | 590 | error = __rpc_pipefs_event(clp, event, sb); |
e9dbca8d | 591 | nfs_put_client(clp); |
eee17325 SK |
592 | if (error) |
593 | break; | |
594 | } | |
71dfc5fa | 595 | module_put(THIS_MODULE); |
eee17325 | 596 | return error; |
1da177e4 LT |
597 | } |
598 | ||
eee17325 SK |
599 | #define PIPEFS_NFS_PRIO 1 |
600 | ||
601 | static struct notifier_block nfs_idmap_block = { | |
602 | .notifier_call = rpc_pipefs_event, | |
603 | .priority = SUNRPC_PIPEFS_NFS_PRIO, | |
604 | }; | |
1da177e4 | 605 | |
eee17325 | 606 | int nfs_idmap_init(void) |
1da177e4 | 607 | { |
e6499c6f BS |
608 | int ret; |
609 | ret = nfs_idmap_init_keyring(); | |
610 | if (ret != 0) | |
611 | goto out; | |
612 | ret = rpc_pipefs_notifier_register(&nfs_idmap_block); | |
613 | if (ret != 0) | |
614 | nfs_idmap_quit_keyring(); | |
615 | out: | |
616 | return ret; | |
1da177e4 LT |
617 | } |
618 | ||
eee17325 | 619 | void nfs_idmap_quit(void) |
1da177e4 | 620 | { |
eee17325 | 621 | rpc_pipefs_notifier_unregister(&nfs_idmap_block); |
e6499c6f | 622 | nfs_idmap_quit_keyring(); |
1da177e4 LT |
623 | } |
624 | ||
c5066945 BS |
625 | static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap, |
626 | struct idmap_msg *im, | |
57e62324 | 627 | struct rpc_pipe_msg *msg) |
1da177e4 | 628 | { |
57e62324 BS |
629 | substring_t substr; |
630 | int token, ret; | |
1da177e4 | 631 | |
57e62324 BS |
632 | im->im_type = IDMAP_TYPE_GROUP; |
633 | token = match_token(desc, nfs_idmap_tokens, &substr); | |
1da177e4 | 634 | |
57e62324 BS |
635 | switch (token) { |
636 | case Opt_find_uid: | |
637 | im->im_type = IDMAP_TYPE_USER; | |
638 | case Opt_find_gid: | |
639 | im->im_conv = IDMAP_CONV_NAMETOID; | |
640 | ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ); | |
641 | break; | |
1da177e4 | 642 | |
57e62324 BS |
643 | case Opt_find_user: |
644 | im->im_type = IDMAP_TYPE_USER; | |
645 | case Opt_find_group: | |
646 | im->im_conv = IDMAP_CONV_IDTONAME; | |
647 | ret = match_int(&substr, &im->im_id); | |
648 | break; | |
1da177e4 | 649 | |
57e62324 BS |
650 | default: |
651 | ret = -EINVAL; | |
1da177e4 LT |
652 | goto out; |
653 | } | |
654 | ||
57e62324 BS |
655 | msg->data = im; |
656 | msg->len = sizeof(struct idmap_msg); | |
1da177e4 | 657 | |
57e62324 | 658 | out: |
369af0f1 | 659 | return ret; |
1da177e4 LT |
660 | } |
661 | ||
e9ab41b6 TM |
662 | static bool |
663 | nfs_idmap_prepare_pipe_upcall(struct idmap *idmap, | |
0cac1202 | 664 | struct idmap_legacy_upcalldata *data) |
e9ab41b6 | 665 | { |
0cac1202 | 666 | if (idmap->idmap_upcall_data != NULL) { |
e9ab41b6 TM |
667 | WARN_ON_ONCE(1); |
668 | return false; | |
669 | } | |
0cac1202 | 670 | idmap->idmap_upcall_data = data; |
e9ab41b6 TM |
671 | return true; |
672 | } | |
673 | ||
674 | static void | |
675 | nfs_idmap_complete_pipe_upcall_locked(struct idmap *idmap, int ret) | |
676 | { | |
0cac1202 | 677 | struct key_construction *cons = idmap->idmap_upcall_data->key_cons; |
e9ab41b6 | 678 | |
0cac1202 TM |
679 | kfree(idmap->idmap_upcall_data); |
680 | idmap->idmap_upcall_data = NULL; | |
e9ab41b6 TM |
681 | complete_request_key(cons, ret); |
682 | } | |
683 | ||
684 | static void | |
685 | nfs_idmap_abort_pipe_upcall(struct idmap *idmap, int ret) | |
686 | { | |
0cac1202 | 687 | if (idmap->idmap_upcall_data != NULL) |
e9ab41b6 TM |
688 | nfs_idmap_complete_pipe_upcall_locked(idmap, ret); |
689 | } | |
690 | ||
57e62324 BS |
691 | static int nfs_idmap_legacy_upcall(struct key_construction *cons, |
692 | const char *op, | |
693 | void *aux) | |
1da177e4 | 694 | { |
c5066945 | 695 | struct idmap_legacy_upcalldata *data; |
57e62324 | 696 | struct rpc_pipe_msg *msg; |
1da177e4 | 697 | struct idmap_msg *im; |
57e62324 BS |
698 | struct idmap *idmap = (struct idmap *)aux; |
699 | struct key *key = cons->key; | |
5abc03cd | 700 | int ret = -ENOMEM; |
1da177e4 | 701 | |
57e62324 | 702 | /* msg and im are freed in idmap_pipe_destroy_msg */ |
57a51048 | 703 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
c5066945 | 704 | if (!data) |
57e62324 | 705 | goto out1; |
1da177e4 | 706 | |
c5066945 BS |
707 | msg = &data->pipe_msg; |
708 | im = &data->idmap_msg; | |
709 | data->idmap = idmap; | |
ddfc4e17 | 710 | data->key_cons = cons; |
c5066945 BS |
711 | |
712 | ret = nfs_idmap_prepare_message(key->description, idmap, im, msg); | |
57e62324 BS |
713 | if (ret < 0) |
714 | goto out2; | |
1da177e4 | 715 | |
e9ab41b6 | 716 | ret = -EAGAIN; |
0cac1202 | 717 | if (!nfs_idmap_prepare_pipe_upcall(idmap, data)) |
0e24d849 | 718 | goto out2; |
1da177e4 | 719 | |
11588f49 BS |
720 | ret = rpc_queue_upcall(idmap->idmap_pipe, msg); |
721 | if (ret < 0) | |
e9ab41b6 | 722 | nfs_idmap_abort_pipe_upcall(idmap, ret); |
1da177e4 | 723 | |
11588f49 | 724 | return ret; |
57e62324 | 725 | out2: |
c5066945 | 726 | kfree(data); |
57e62324 | 727 | out1: |
a427b9ec | 728 | complete_request_key(cons, ret); |
369af0f1 | 729 | return ret; |
1da177e4 LT |
730 | } |
731 | ||
57e62324 | 732 | static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data) |
1da177e4 | 733 | { |
57e62324 BS |
734 | return key_instantiate_and_link(key, data, strlen(data) + 1, |
735 | id_resolver_cache->thread_keyring, | |
736 | authkey); | |
737 | } | |
1da177e4 | 738 | |
0cac1202 TM |
739 | static int nfs_idmap_read_and_verify_message(struct idmap_msg *im, |
740 | struct idmap_msg *upcall, | |
741 | struct key *key, struct key *authkey) | |
57e62324 BS |
742 | { |
743 | char id_str[NFS_UINT_MAXLEN]; | |
0cac1202 | 744 | int ret = -ENOKEY; |
1da177e4 | 745 | |
0cac1202 TM |
746 | /* ret = -ENOKEY */ |
747 | if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv) | |
748 | goto out; | |
57e62324 BS |
749 | switch (im->im_conv) { |
750 | case IDMAP_CONV_NAMETOID: | |
0cac1202 TM |
751 | if (strcmp(upcall->im_name, im->im_name) != 0) |
752 | break; | |
57e62324 BS |
753 | sprintf(id_str, "%d", im->im_id); |
754 | ret = nfs_idmap_instantiate(key, authkey, id_str); | |
755 | break; | |
756 | case IDMAP_CONV_IDTONAME: | |
0cac1202 TM |
757 | if (upcall->im_id != im->im_id) |
758 | break; | |
57e62324 BS |
759 | ret = nfs_idmap_instantiate(key, authkey, im->im_name); |
760 | break; | |
0cac1202 TM |
761 | default: |
762 | ret = -EINVAL; | |
1da177e4 | 763 | } |
0cac1202 | 764 | out: |
1da177e4 LT |
765 | return ret; |
766 | } | |
767 | ||
1da177e4 LT |
768 | static ssize_t |
769 | idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
770 | { | |
369af0f1 | 771 | struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); |
1da177e4 | 772 | struct idmap *idmap = (struct idmap *)rpci->private; |
a427b9ec | 773 | struct key_construction *cons; |
57e62324 | 774 | struct idmap_msg im; |
d24aae41 | 775 | size_t namelen_in; |
e9ab41b6 | 776 | int ret = -ENOKEY; |
1da177e4 | 777 | |
a427b9ec DH |
778 | /* If instantiation is successful, anyone waiting for key construction |
779 | * will have been woken up and someone else may now have used | |
780 | * idmap_key_cons - so after this point we may no longer touch it. | |
781 | */ | |
0cac1202 | 782 | if (idmap->idmap_upcall_data == NULL) |
e9ab41b6 | 783 | goto out_noupcall; |
a427b9ec | 784 | |
0cac1202 | 785 | cons = idmap->idmap_upcall_data->key_cons; |
a427b9ec | 786 | |
57e62324 BS |
787 | if (mlen != sizeof(im)) { |
788 | ret = -ENOSPC; | |
1da177e4 LT |
789 | goto out; |
790 | } | |
791 | ||
57e62324 BS |
792 | if (copy_from_user(&im, src, mlen) != 0) { |
793 | ret = -EFAULT; | |
1da177e4 | 794 | goto out; |
57e62324 | 795 | } |
1da177e4 | 796 | |
57e62324 | 797 | if (!(im.im_status & IDMAP_STATUS_SUCCESS)) { |
12dfd080 BS |
798 | ret = -ENOKEY; |
799 | goto out; | |
1da177e4 LT |
800 | } |
801 | ||
57e62324 BS |
802 | namelen_in = strnlen(im.im_name, IDMAP_NAMESZ); |
803 | if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) { | |
804 | ret = -EINVAL; | |
1da177e4 | 805 | goto out; |
0cac1202 | 806 | } |
1da177e4 | 807 | |
0cac1202 TM |
808 | ret = nfs_idmap_read_and_verify_message(&im, |
809 | &idmap->idmap_upcall_data->idmap_msg, | |
810 | cons->key, cons->authkey); | |
57e62324 BS |
811 | if (ret >= 0) { |
812 | key_set_timeout(cons->key, nfs_idmap_cache_timeout); | |
813 | ret = mlen; | |
814 | } | |
815 | ||
1da177e4 | 816 | out: |
e9ab41b6 TM |
817 | nfs_idmap_complete_pipe_upcall_locked(idmap, ret); |
818 | out_noupcall: | |
1da177e4 LT |
819 | return ret; |
820 | } | |
821 | ||
75c96f85 | 822 | static void |
1da177e4 LT |
823 | idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
824 | { | |
c5066945 BS |
825 | struct idmap_legacy_upcalldata *data = container_of(msg, |
826 | struct idmap_legacy_upcalldata, | |
827 | pipe_msg); | |
828 | struct idmap *idmap = data->idmap; | |
e9ab41b6 TM |
829 | |
830 | if (msg->errno) | |
831 | nfs_idmap_abort_pipe_upcall(idmap, msg->errno); | |
c5066945 BS |
832 | } |
833 | ||
834 | static void | |
835 | idmap_release_pipe(struct inode *inode) | |
836 | { | |
837 | struct rpc_inode *rpci = RPC_I(inode); | |
838 | struct idmap *idmap = (struct idmap *)rpci->private; | |
e9ab41b6 TM |
839 | |
840 | nfs_idmap_abort_pipe_upcall(idmap, -EPIPE); | |
1da177e4 LT |
841 | } |
842 | ||
e4fd72a1 | 843 | int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid) |
1da177e4 | 844 | { |
e4fd72a1 | 845 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 846 | |
5cf36cfd TM |
847 | if (nfs_map_string_to_numeric(name, namelen, uid)) |
848 | return 0; | |
57e62324 | 849 | return nfs_idmap_lookup_id(name, namelen, "uid", uid, idmap); |
1da177e4 LT |
850 | } |
851 | ||
e6499c6f | 852 | int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid) |
1da177e4 | 853 | { |
e4fd72a1 | 854 | struct idmap *idmap = server->nfs_client->cl_idmap; |
1da177e4 | 855 | |
e6499c6f | 856 | if (nfs_map_string_to_numeric(name, namelen, gid)) |
5cf36cfd | 857 | return 0; |
57e62324 | 858 | return nfs_idmap_lookup_id(name, namelen, "gid", gid, idmap); |
1da177e4 LT |
859 | } |
860 | ||
e4fd72a1 | 861 | int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen) |
1da177e4 | 862 | { |
e4fd72a1 | 863 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 864 | int ret = -EINVAL; |
1da177e4 | 865 | |
b064eca2 | 866 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
57e62324 | 867 | ret = nfs_idmap_lookup_name(uid, "user", buf, buflen, idmap); |
f0b85168 TM |
868 | if (ret < 0) |
869 | ret = nfs_map_numeric_to_string(uid, buf, buflen); | |
870 | return ret; | |
1da177e4 | 871 | } |
e6499c6f | 872 | int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen) |
1da177e4 | 873 | { |
e4fd72a1 | 874 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 875 | int ret = -EINVAL; |
1da177e4 | 876 | |
b064eca2 | 877 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
57e62324 | 878 | ret = nfs_idmap_lookup_name(gid, "group", buf, buflen, idmap); |
f0b85168 | 879 | if (ret < 0) |
e6499c6f | 880 | ret = nfs_map_numeric_to_string(gid, buf, buflen); |
f0b85168 | 881 | return ret; |
1da177e4 | 882 | } |