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Commit | Line | Data |
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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; | |
9f309c86 | 100 | kuid_t uid; |
6926afd1 TM |
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; | |
9f309c86 | 114 | kgid_t gid; |
6926afd1 TM |
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 | ||
4e963d4f EB |
196 | keyring = keyring_alloc(".id_resolver", |
197 | GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred, | |
f8aa23a5 DH |
198 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | |
199 | KEY_USR_VIEW | KEY_USR_READ, | |
200 | KEY_ALLOC_NOT_IN_QUOTA, NULL); | |
955a857e BS |
201 | if (IS_ERR(keyring)) { |
202 | ret = PTR_ERR(keyring); | |
203 | goto failed_put_cred; | |
204 | } | |
205 | ||
955a857e BS |
206 | ret = register_key_type(&key_type_id_resolver); |
207 | if (ret < 0) | |
208 | goto failed_put_key; | |
209 | ||
a427b9ec DH |
210 | ret = register_key_type(&key_type_id_resolver_legacy); |
211 | if (ret < 0) | |
212 | goto failed_reg_legacy; | |
213 | ||
700920eb | 214 | set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags); |
955a857e BS |
215 | cred->thread_keyring = keyring; |
216 | cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING; | |
217 | id_resolver_cache = cred; | |
218 | return 0; | |
219 | ||
a427b9ec DH |
220 | failed_reg_legacy: |
221 | unregister_key_type(&key_type_id_resolver); | |
955a857e BS |
222 | failed_put_key: |
223 | key_put(keyring); | |
224 | failed_put_cred: | |
225 | put_cred(cred); | |
226 | return ret; | |
227 | } | |
228 | ||
e6499c6f | 229 | static void nfs_idmap_quit_keyring(void) |
955a857e BS |
230 | { |
231 | key_revoke(id_resolver_cache->thread_keyring); | |
232 | unregister_key_type(&key_type_id_resolver); | |
a427b9ec | 233 | unregister_key_type(&key_type_id_resolver_legacy); |
955a857e BS |
234 | put_cred(id_resolver_cache); |
235 | } | |
236 | ||
237 | /* | |
238 | * Assemble the description to pass to request_key() | |
239 | * This function will allocate a new string and update dest to point | |
240 | * at it. The caller is responsible for freeing dest. | |
241 | * | |
242 | * On error 0 is returned. Otherwise, the length of dest is returned. | |
243 | */ | |
244 | static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen, | |
245 | const char *type, size_t typelen, char **desc) | |
246 | { | |
247 | char *cp; | |
248 | size_t desclen = typelen + namelen + 2; | |
249 | ||
250 | *desc = kmalloc(desclen, GFP_KERNEL); | |
8f0d97b4 | 251 | if (!*desc) |
955a857e BS |
252 | return -ENOMEM; |
253 | ||
254 | cp = *desc; | |
255 | memcpy(cp, type, typelen); | |
256 | cp += typelen; | |
257 | *cp++ = ':'; | |
258 | ||
259 | memcpy(cp, name, namelen); | |
260 | cp += namelen; | |
261 | *cp = '\0'; | |
262 | return desclen; | |
263 | } | |
264 | ||
57e62324 BS |
265 | static ssize_t nfs_idmap_request_key(struct key_type *key_type, |
266 | const char *name, size_t namelen, | |
267 | const char *type, void *data, | |
268 | size_t data_size, struct idmap *idmap) | |
955a857e BS |
269 | { |
270 | const struct cred *saved_cred; | |
271 | struct key *rkey; | |
272 | char *desc; | |
273 | struct user_key_payload *payload; | |
274 | ssize_t ret; | |
275 | ||
276 | ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc); | |
277 | if (ret <= 0) | |
278 | goto out; | |
279 | ||
280 | saved_cred = override_creds(id_resolver_cache); | |
57e62324 BS |
281 | if (idmap) |
282 | rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap); | |
283 | else | |
284 | rkey = request_key(&key_type_id_resolver, desc, ""); | |
955a857e | 285 | revert_creds(saved_cred); |
57e62324 | 286 | |
955a857e BS |
287 | kfree(desc); |
288 | if (IS_ERR(rkey)) { | |
289 | ret = PTR_ERR(rkey); | |
290 | goto out; | |
291 | } | |
292 | ||
293 | rcu_read_lock(); | |
294 | rkey->perm |= KEY_USR_VIEW; | |
295 | ||
296 | ret = key_validate(rkey); | |
297 | if (ret < 0) | |
298 | goto out_up; | |
299 | ||
300 | payload = rcu_dereference(rkey->payload.data); | |
301 | if (IS_ERR_OR_NULL(payload)) { | |
302 | ret = PTR_ERR(payload); | |
303 | goto out_up; | |
304 | } | |
305 | ||
306 | ret = payload->datalen; | |
307 | if (ret > 0 && ret <= data_size) | |
308 | memcpy(data, payload->data, ret); | |
309 | else | |
310 | ret = -EINVAL; | |
311 | ||
312 | out_up: | |
313 | rcu_read_unlock(); | |
314 | key_put(rkey); | |
315 | out: | |
316 | return ret; | |
317 | } | |
318 | ||
57e62324 BS |
319 | static ssize_t nfs_idmap_get_key(const char *name, size_t namelen, |
320 | const char *type, void *data, | |
321 | size_t data_size, struct idmap *idmap) | |
322 | { | |
323 | ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver, | |
324 | name, namelen, type, data, | |
325 | data_size, NULL); | |
326 | if (ret < 0) { | |
b1027439 | 327 | mutex_lock(&idmap->idmap_mutex); |
57e62324 BS |
328 | ret = nfs_idmap_request_key(&key_type_id_resolver_legacy, |
329 | name, namelen, type, data, | |
330 | data_size, idmap); | |
b1027439 | 331 | mutex_unlock(&idmap->idmap_mutex); |
57e62324 BS |
332 | } |
333 | return ret; | |
334 | } | |
955a857e BS |
335 | |
336 | /* ID -> Name */ | |
57e62324 BS |
337 | static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf, |
338 | size_t buflen, struct idmap *idmap) | |
955a857e BS |
339 | { |
340 | char id_str[NFS_UINT_MAXLEN]; | |
341 | int id_len; | |
342 | ssize_t ret; | |
343 | ||
344 | id_len = snprintf(id_str, sizeof(id_str), "%u", id); | |
57e62324 | 345 | ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap); |
955a857e BS |
346 | if (ret < 0) |
347 | return -EINVAL; | |
348 | return ret; | |
349 | } | |
350 | ||
351 | /* Name -> ID */ | |
57e62324 BS |
352 | static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type, |
353 | __u32 *id, struct idmap *idmap) | |
955a857e BS |
354 | { |
355 | char id_str[NFS_UINT_MAXLEN]; | |
356 | long id_long; | |
357 | ssize_t data_size; | |
358 | int ret = 0; | |
359 | ||
57e62324 | 360 | data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap); |
955a857e BS |
361 | if (data_size <= 0) { |
362 | ret = -EINVAL; | |
363 | } else { | |
7297cb68 | 364 | ret = kstrtol(id_str, 10, &id_long); |
955a857e BS |
365 | *id = (__u32)id_long; |
366 | } | |
367 | return ret; | |
368 | } | |
369 | ||
e6499c6f | 370 | /* idmap classic begins here */ |
f0b85168 | 371 | |
57e62324 BS |
372 | enum { |
373 | Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err | |
1da177e4 LT |
374 | }; |
375 | ||
57e62324 BS |
376 | static const match_table_t nfs_idmap_tokens = { |
377 | { Opt_find_uid, "uid:%s" }, | |
378 | { Opt_find_gid, "gid:%s" }, | |
379 | { Opt_find_user, "user:%s" }, | |
380 | { Opt_find_group, "group:%s" }, | |
381 | { Opt_find_err, NULL } | |
1da177e4 LT |
382 | }; |
383 | ||
57e62324 | 384 | static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *); |
369af0f1 CL |
385 | static ssize_t idmap_pipe_downcall(struct file *, const char __user *, |
386 | size_t); | |
c5066945 | 387 | static void idmap_release_pipe(struct inode *); |
369af0f1 | 388 | static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); |
1da177e4 | 389 | |
b693ba4a | 390 | static const struct rpc_pipe_ops idmap_upcall_ops = { |
c1225158 | 391 | .upcall = rpc_pipe_generic_upcall, |
369af0f1 | 392 | .downcall = idmap_pipe_downcall, |
c5066945 | 393 | .release_pipe = idmap_release_pipe, |
369af0f1 | 394 | .destroy_msg = idmap_pipe_destroy_msg, |
1da177e4 LT |
395 | }; |
396 | ||
17280175 | 397 | static struct key_type key_type_id_resolver_legacy = { |
a427b9ec | 398 | .name = "id_legacy", |
57e62324 BS |
399 | .instantiate = user_instantiate, |
400 | .match = user_match, | |
401 | .revoke = user_revoke, | |
402 | .destroy = user_destroy, | |
403 | .describe = user_describe, | |
404 | .read = user_read, | |
405 | .request_key = nfs_idmap_legacy_upcall, | |
406 | }; | |
407 | ||
4929d1d3 SK |
408 | static void __nfs_idmap_unregister(struct rpc_pipe *pipe) |
409 | { | |
410 | if (pipe->dentry) | |
411 | rpc_unlink(pipe->dentry); | |
412 | } | |
413 | ||
414 | static int __nfs_idmap_register(struct dentry *dir, | |
415 | struct idmap *idmap, | |
416 | struct rpc_pipe *pipe) | |
417 | { | |
418 | struct dentry *dentry; | |
419 | ||
420 | dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe); | |
421 | if (IS_ERR(dentry)) | |
422 | return PTR_ERR(dentry); | |
423 | pipe->dentry = dentry; | |
424 | return 0; | |
425 | } | |
426 | ||
427 | static void nfs_idmap_unregister(struct nfs_client *clp, | |
428 | struct rpc_pipe *pipe) | |
429 | { | |
73ea666c | 430 | struct net *net = clp->cl_net; |
4929d1d3 SK |
431 | struct super_block *pipefs_sb; |
432 | ||
433 | pipefs_sb = rpc_get_sb_net(net); | |
434 | if (pipefs_sb) { | |
435 | __nfs_idmap_unregister(pipe); | |
436 | rpc_put_sb_net(net); | |
437 | } | |
438 | } | |
439 | ||
440 | static int nfs_idmap_register(struct nfs_client *clp, | |
441 | struct idmap *idmap, | |
442 | struct rpc_pipe *pipe) | |
443 | { | |
73ea666c | 444 | struct net *net = clp->cl_net; |
4929d1d3 SK |
445 | struct super_block *pipefs_sb; |
446 | int err = 0; | |
447 | ||
448 | pipefs_sb = rpc_get_sb_net(net); | |
449 | if (pipefs_sb) { | |
450 | if (clp->cl_rpcclient->cl_dentry) | |
451 | err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry, | |
452 | idmap, pipe); | |
453 | rpc_put_sb_net(net); | |
454 | } | |
455 | return err; | |
456 | } | |
457 | ||
b7162792 | 458 | int |
adfa6f98 | 459 | nfs_idmap_new(struct nfs_client *clp) |
1da177e4 LT |
460 | { |
461 | struct idmap *idmap; | |
c239d83b | 462 | struct rpc_pipe *pipe; |
b7162792 | 463 | int error; |
1da177e4 | 464 | |
369af0f1 CL |
465 | idmap = kzalloc(sizeof(*idmap), GFP_KERNEL); |
466 | if (idmap == NULL) | |
467 | return -ENOMEM; | |
1da177e4 | 468 | |
c239d83b SK |
469 | pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0); |
470 | if (IS_ERR(pipe)) { | |
471 | error = PTR_ERR(pipe); | |
1da177e4 | 472 | kfree(idmap); |
b7162792 | 473 | return error; |
1da177e4 | 474 | } |
4929d1d3 SK |
475 | error = nfs_idmap_register(clp, idmap, pipe); |
476 | if (error) { | |
c239d83b SK |
477 | rpc_destroy_pipe_data(pipe); |
478 | kfree(idmap); | |
479 | return error; | |
480 | } | |
481 | idmap->idmap_pipe = pipe; | |
b1027439 | 482 | mutex_init(&idmap->idmap_mutex); |
1da177e4 LT |
483 | |
484 | clp->cl_idmap = idmap; | |
b7162792 | 485 | return 0; |
1da177e4 LT |
486 | } |
487 | ||
488 | void | |
adfa6f98 | 489 | nfs_idmap_delete(struct nfs_client *clp) |
1da177e4 LT |
490 | { |
491 | struct idmap *idmap = clp->cl_idmap; | |
492 | ||
493 | if (!idmap) | |
494 | return; | |
4929d1d3 | 495 | nfs_idmap_unregister(clp, idmap->idmap_pipe); |
c239d83b | 496 | rpc_destroy_pipe_data(idmap->idmap_pipe); |
1da177e4 LT |
497 | clp->cl_idmap = NULL; |
498 | kfree(idmap); | |
499 | } | |
500 | ||
eee17325 SK |
501 | static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event, |
502 | struct super_block *sb) | |
1da177e4 | 503 | { |
eee17325 | 504 | int err = 0; |
1da177e4 | 505 | |
eee17325 SK |
506 | switch (event) { |
507 | case RPC_PIPEFS_MOUNT: | |
eee17325 SK |
508 | err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry, |
509 | clp->cl_idmap, | |
510 | clp->cl_idmap->idmap_pipe); | |
511 | break; | |
512 | case RPC_PIPEFS_UMOUNT: | |
513 | if (clp->cl_idmap->idmap_pipe) { | |
514 | struct dentry *parent; | |
515 | ||
516 | parent = clp->cl_idmap->idmap_pipe->dentry->d_parent; | |
517 | __nfs_idmap_unregister(clp->cl_idmap->idmap_pipe); | |
518 | /* | |
519 | * Note: This is a dirty hack. SUNRPC hook has been | |
520 | * called already but simple_rmdir() call for the | |
521 | * directory returned with error because of idmap pipe | |
522 | * inside. Thus now we have to remove this directory | |
523 | * here. | |
524 | */ | |
525 | if (rpc_rmdir(parent)) | |
a030889a WAA |
526 | printk(KERN_ERR "NFS: %s: failed to remove " |
527 | "clnt dir!\n", __func__); | |
eee17325 SK |
528 | } |
529 | break; | |
530 | default: | |
a030889a WAA |
531 | printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__, |
532 | event); | |
eee17325 SK |
533 | return -ENOTSUPP; |
534 | } | |
535 | return err; | |
536 | } | |
537 | ||
e9dbca8d | 538 | static struct nfs_client *nfs_get_client_for_event(struct net *net, int event) |
eee17325 | 539 | { |
e9dbca8d SK |
540 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
541 | struct dentry *cl_dentry; | |
eee17325 | 542 | struct nfs_client *clp; |
4697bd5e | 543 | int err; |
eee17325 | 544 | |
4697bd5e | 545 | restart: |
dc030858 | 546 | spin_lock(&nn->nfs_client_lock); |
6b13168b | 547 | list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { |
4697bd5e TM |
548 | /* Wait for initialisation to finish */ |
549 | if (clp->cl_cons_state == NFS_CS_INITING) { | |
550 | atomic_inc(&clp->cl_count); | |
551 | spin_unlock(&nn->nfs_client_lock); | |
552 | err = nfs_wait_client_init_complete(clp); | |
553 | nfs_put_client(clp); | |
554 | if (err) | |
555 | return NULL; | |
556 | goto restart; | |
557 | } | |
558 | /* Skip nfs_clients that failed to initialise */ | |
559 | if (clp->cl_cons_state < 0) | |
560 | continue; | |
54ac471c | 561 | smp_rmb(); |
eee17325 SK |
562 | if (clp->rpc_ops != &nfs_v4_clientops) |
563 | continue; | |
e9dbca8d SK |
564 | cl_dentry = clp->cl_idmap->idmap_pipe->dentry; |
565 | if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) || | |
566 | ((event == RPC_PIPEFS_UMOUNT) && !cl_dentry)) | |
567 | continue; | |
568 | atomic_inc(&clp->cl_count); | |
569 | spin_unlock(&nn->nfs_client_lock); | |
570 | return clp; | |
571 | } | |
572 | spin_unlock(&nn->nfs_client_lock); | |
573 | return NULL; | |
1da177e4 LT |
574 | } |
575 | ||
e9dbca8d SK |
576 | static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event, |
577 | void *ptr) | |
1da177e4 | 578 | { |
e9dbca8d SK |
579 | struct super_block *sb = ptr; |
580 | struct nfs_client *clp; | |
581 | int error = 0; | |
1da177e4 | 582 | |
71dfc5fa SK |
583 | if (!try_module_get(THIS_MODULE)) |
584 | return 0; | |
585 | ||
e9dbca8d | 586 | while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) { |
eee17325 | 587 | error = __rpc_pipefs_event(clp, event, sb); |
e9dbca8d | 588 | nfs_put_client(clp); |
eee17325 SK |
589 | if (error) |
590 | break; | |
591 | } | |
71dfc5fa | 592 | module_put(THIS_MODULE); |
eee17325 | 593 | return error; |
1da177e4 LT |
594 | } |
595 | ||
eee17325 SK |
596 | #define PIPEFS_NFS_PRIO 1 |
597 | ||
598 | static struct notifier_block nfs_idmap_block = { | |
599 | .notifier_call = rpc_pipefs_event, | |
600 | .priority = SUNRPC_PIPEFS_NFS_PRIO, | |
601 | }; | |
1da177e4 | 602 | |
eee17325 | 603 | int nfs_idmap_init(void) |
1da177e4 | 604 | { |
e6499c6f BS |
605 | int ret; |
606 | ret = nfs_idmap_init_keyring(); | |
607 | if (ret != 0) | |
608 | goto out; | |
609 | ret = rpc_pipefs_notifier_register(&nfs_idmap_block); | |
610 | if (ret != 0) | |
611 | nfs_idmap_quit_keyring(); | |
612 | out: | |
613 | return ret; | |
1da177e4 LT |
614 | } |
615 | ||
eee17325 | 616 | void nfs_idmap_quit(void) |
1da177e4 | 617 | { |
eee17325 | 618 | rpc_pipefs_notifier_unregister(&nfs_idmap_block); |
e6499c6f | 619 | nfs_idmap_quit_keyring(); |
1da177e4 LT |
620 | } |
621 | ||
c5066945 BS |
622 | static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap, |
623 | struct idmap_msg *im, | |
57e62324 | 624 | struct rpc_pipe_msg *msg) |
1da177e4 | 625 | { |
57e62324 BS |
626 | substring_t substr; |
627 | int token, ret; | |
1da177e4 | 628 | |
57e62324 BS |
629 | im->im_type = IDMAP_TYPE_GROUP; |
630 | token = match_token(desc, nfs_idmap_tokens, &substr); | |
1da177e4 | 631 | |
57e62324 BS |
632 | switch (token) { |
633 | case Opt_find_uid: | |
634 | im->im_type = IDMAP_TYPE_USER; | |
635 | case Opt_find_gid: | |
636 | im->im_conv = IDMAP_CONV_NAMETOID; | |
637 | ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ); | |
638 | break; | |
1da177e4 | 639 | |
57e62324 BS |
640 | case Opt_find_user: |
641 | im->im_type = IDMAP_TYPE_USER; | |
642 | case Opt_find_group: | |
643 | im->im_conv = IDMAP_CONV_IDTONAME; | |
644 | ret = match_int(&substr, &im->im_id); | |
645 | break; | |
1da177e4 | 646 | |
57e62324 BS |
647 | default: |
648 | ret = -EINVAL; | |
1da177e4 LT |
649 | goto out; |
650 | } | |
651 | ||
57e62324 BS |
652 | msg->data = im; |
653 | msg->len = sizeof(struct idmap_msg); | |
1da177e4 | 654 | |
57e62324 | 655 | out: |
369af0f1 | 656 | return ret; |
1da177e4 LT |
657 | } |
658 | ||
e9ab41b6 TM |
659 | static bool |
660 | nfs_idmap_prepare_pipe_upcall(struct idmap *idmap, | |
0cac1202 | 661 | struct idmap_legacy_upcalldata *data) |
e9ab41b6 | 662 | { |
0cac1202 | 663 | if (idmap->idmap_upcall_data != NULL) { |
e9ab41b6 TM |
664 | WARN_ON_ONCE(1); |
665 | return false; | |
666 | } | |
0cac1202 | 667 | idmap->idmap_upcall_data = data; |
e9ab41b6 TM |
668 | return true; |
669 | } | |
670 | ||
671 | static void | |
672 | nfs_idmap_complete_pipe_upcall_locked(struct idmap *idmap, int ret) | |
673 | { | |
0cac1202 | 674 | struct key_construction *cons = idmap->idmap_upcall_data->key_cons; |
e9ab41b6 | 675 | |
0cac1202 TM |
676 | kfree(idmap->idmap_upcall_data); |
677 | idmap->idmap_upcall_data = NULL; | |
e9ab41b6 TM |
678 | complete_request_key(cons, ret); |
679 | } | |
680 | ||
681 | static void | |
682 | nfs_idmap_abort_pipe_upcall(struct idmap *idmap, int ret) | |
683 | { | |
0cac1202 | 684 | if (idmap->idmap_upcall_data != NULL) |
e9ab41b6 TM |
685 | nfs_idmap_complete_pipe_upcall_locked(idmap, ret); |
686 | } | |
687 | ||
57e62324 BS |
688 | static int nfs_idmap_legacy_upcall(struct key_construction *cons, |
689 | const char *op, | |
690 | void *aux) | |
1da177e4 | 691 | { |
c5066945 | 692 | struct idmap_legacy_upcalldata *data; |
57e62324 | 693 | struct rpc_pipe_msg *msg; |
1da177e4 | 694 | struct idmap_msg *im; |
57e62324 BS |
695 | struct idmap *idmap = (struct idmap *)aux; |
696 | struct key *key = cons->key; | |
5abc03cd | 697 | int ret = -ENOMEM; |
1da177e4 | 698 | |
57e62324 | 699 | /* msg and im are freed in idmap_pipe_destroy_msg */ |
57a51048 | 700 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
c5066945 | 701 | if (!data) |
57e62324 | 702 | goto out1; |
1da177e4 | 703 | |
c5066945 BS |
704 | msg = &data->pipe_msg; |
705 | im = &data->idmap_msg; | |
706 | data->idmap = idmap; | |
ddfc4e17 | 707 | data->key_cons = cons; |
c5066945 BS |
708 | |
709 | ret = nfs_idmap_prepare_message(key->description, idmap, im, msg); | |
57e62324 BS |
710 | if (ret < 0) |
711 | goto out2; | |
1da177e4 | 712 | |
e9ab41b6 | 713 | ret = -EAGAIN; |
0cac1202 | 714 | if (!nfs_idmap_prepare_pipe_upcall(idmap, data)) |
0e24d849 | 715 | goto out2; |
1da177e4 | 716 | |
11588f49 BS |
717 | ret = rpc_queue_upcall(idmap->idmap_pipe, msg); |
718 | if (ret < 0) | |
e9ab41b6 | 719 | nfs_idmap_abort_pipe_upcall(idmap, ret); |
1da177e4 | 720 | |
11588f49 | 721 | return ret; |
57e62324 | 722 | out2: |
c5066945 | 723 | kfree(data); |
57e62324 | 724 | out1: |
a427b9ec | 725 | complete_request_key(cons, ret); |
369af0f1 | 726 | return ret; |
1da177e4 LT |
727 | } |
728 | ||
57e62324 | 729 | static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data) |
1da177e4 | 730 | { |
57e62324 BS |
731 | return key_instantiate_and_link(key, data, strlen(data) + 1, |
732 | id_resolver_cache->thread_keyring, | |
733 | authkey); | |
734 | } | |
1da177e4 | 735 | |
0cac1202 TM |
736 | static int nfs_idmap_read_and_verify_message(struct idmap_msg *im, |
737 | struct idmap_msg *upcall, | |
738 | struct key *key, struct key *authkey) | |
57e62324 BS |
739 | { |
740 | char id_str[NFS_UINT_MAXLEN]; | |
0cac1202 | 741 | int ret = -ENOKEY; |
1da177e4 | 742 | |
0cac1202 TM |
743 | /* ret = -ENOKEY */ |
744 | if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv) | |
745 | goto out; | |
57e62324 BS |
746 | switch (im->im_conv) { |
747 | case IDMAP_CONV_NAMETOID: | |
0cac1202 TM |
748 | if (strcmp(upcall->im_name, im->im_name) != 0) |
749 | break; | |
57e62324 BS |
750 | sprintf(id_str, "%d", im->im_id); |
751 | ret = nfs_idmap_instantiate(key, authkey, id_str); | |
752 | break; | |
753 | case IDMAP_CONV_IDTONAME: | |
0cac1202 TM |
754 | if (upcall->im_id != im->im_id) |
755 | break; | |
57e62324 BS |
756 | ret = nfs_idmap_instantiate(key, authkey, im->im_name); |
757 | break; | |
0cac1202 TM |
758 | default: |
759 | ret = -EINVAL; | |
1da177e4 | 760 | } |
0cac1202 | 761 | out: |
1da177e4 LT |
762 | return ret; |
763 | } | |
764 | ||
1da177e4 LT |
765 | static ssize_t |
766 | idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) | |
767 | { | |
496ad9aa | 768 | struct rpc_inode *rpci = RPC_I(file_inode(filp)); |
1da177e4 | 769 | struct idmap *idmap = (struct idmap *)rpci->private; |
a427b9ec | 770 | struct key_construction *cons; |
57e62324 | 771 | struct idmap_msg im; |
d24aae41 | 772 | size_t namelen_in; |
e9ab41b6 | 773 | int ret = -ENOKEY; |
1da177e4 | 774 | |
a427b9ec DH |
775 | /* If instantiation is successful, anyone waiting for key construction |
776 | * will have been woken up and someone else may now have used | |
777 | * idmap_key_cons - so after this point we may no longer touch it. | |
778 | */ | |
0cac1202 | 779 | if (idmap->idmap_upcall_data == NULL) |
e9ab41b6 | 780 | goto out_noupcall; |
a427b9ec | 781 | |
0cac1202 | 782 | cons = idmap->idmap_upcall_data->key_cons; |
a427b9ec | 783 | |
57e62324 BS |
784 | if (mlen != sizeof(im)) { |
785 | ret = -ENOSPC; | |
1da177e4 LT |
786 | goto out; |
787 | } | |
788 | ||
57e62324 BS |
789 | if (copy_from_user(&im, src, mlen) != 0) { |
790 | ret = -EFAULT; | |
1da177e4 | 791 | goto out; |
57e62324 | 792 | } |
1da177e4 | 793 | |
57e62324 | 794 | if (!(im.im_status & IDMAP_STATUS_SUCCESS)) { |
12dfd080 BS |
795 | ret = -ENOKEY; |
796 | goto out; | |
1da177e4 LT |
797 | } |
798 | ||
57e62324 BS |
799 | namelen_in = strnlen(im.im_name, IDMAP_NAMESZ); |
800 | if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) { | |
801 | ret = -EINVAL; | |
1da177e4 | 802 | goto out; |
0cac1202 | 803 | } |
1da177e4 | 804 | |
0cac1202 TM |
805 | ret = nfs_idmap_read_and_verify_message(&im, |
806 | &idmap->idmap_upcall_data->idmap_msg, | |
807 | cons->key, cons->authkey); | |
57e62324 BS |
808 | if (ret >= 0) { |
809 | key_set_timeout(cons->key, nfs_idmap_cache_timeout); | |
810 | ret = mlen; | |
811 | } | |
812 | ||
1da177e4 | 813 | out: |
e9ab41b6 TM |
814 | nfs_idmap_complete_pipe_upcall_locked(idmap, ret); |
815 | out_noupcall: | |
1da177e4 LT |
816 | return ret; |
817 | } | |
818 | ||
75c96f85 | 819 | static void |
1da177e4 LT |
820 | idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
821 | { | |
c5066945 BS |
822 | struct idmap_legacy_upcalldata *data = container_of(msg, |
823 | struct idmap_legacy_upcalldata, | |
824 | pipe_msg); | |
825 | struct idmap *idmap = data->idmap; | |
e9ab41b6 TM |
826 | |
827 | if (msg->errno) | |
828 | nfs_idmap_abort_pipe_upcall(idmap, msg->errno); | |
c5066945 BS |
829 | } |
830 | ||
831 | static void | |
832 | idmap_release_pipe(struct inode *inode) | |
833 | { | |
834 | struct rpc_inode *rpci = RPC_I(inode); | |
835 | struct idmap *idmap = (struct idmap *)rpci->private; | |
e9ab41b6 TM |
836 | |
837 | nfs_idmap_abort_pipe_upcall(idmap, -EPIPE); | |
1da177e4 LT |
838 | } |
839 | ||
9f309c86 | 840 | int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid) |
1da177e4 | 841 | { |
e4fd72a1 | 842 | struct idmap *idmap = server->nfs_client->cl_idmap; |
9f309c86 EB |
843 | __u32 id = -1; |
844 | int ret = 0; | |
1da177e4 | 845 | |
9f309c86 EB |
846 | if (!nfs_map_string_to_numeric(name, namelen, &id)) |
847 | ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap); | |
848 | if (ret == 0) { | |
849 | *uid = make_kuid(&init_user_ns, id); | |
850 | if (!uid_valid(*uid)) | |
851 | ret = -ERANGE; | |
852 | } | |
853 | return ret; | |
1da177e4 LT |
854 | } |
855 | ||
9f309c86 | 856 | int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid) |
1da177e4 | 857 | { |
e4fd72a1 | 858 | struct idmap *idmap = server->nfs_client->cl_idmap; |
9f309c86 EB |
859 | __u32 id = -1; |
860 | int ret = 0; | |
1da177e4 | 861 | |
9f309c86 EB |
862 | if (!nfs_map_string_to_numeric(name, namelen, &id)) |
863 | ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap); | |
864 | if (ret == 0) { | |
865 | *gid = make_kgid(&init_user_ns, id); | |
866 | if (!gid_valid(*gid)) | |
867 | ret = -ERANGE; | |
868 | } | |
869 | return ret; | |
1da177e4 LT |
870 | } |
871 | ||
9f309c86 | 872 | int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen) |
1da177e4 | 873 | { |
e4fd72a1 | 874 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 875 | int ret = -EINVAL; |
9f309c86 | 876 | __u32 id; |
1da177e4 | 877 | |
9f309c86 | 878 | id = from_kuid(&init_user_ns, uid); |
b064eca2 | 879 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
9f309c86 | 880 | ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap); |
f0b85168 | 881 | if (ret < 0) |
9f309c86 | 882 | ret = nfs_map_numeric_to_string(id, buf, buflen); |
f0b85168 | 883 | return ret; |
1da177e4 | 884 | } |
9f309c86 | 885 | int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen) |
1da177e4 | 886 | { |
e4fd72a1 | 887 | struct idmap *idmap = server->nfs_client->cl_idmap; |
b064eca2 | 888 | int ret = -EINVAL; |
9f309c86 | 889 | __u32 id; |
1da177e4 | 890 | |
9f309c86 | 891 | id = from_kgid(&init_user_ns, gid); |
b064eca2 | 892 | if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) |
9f309c86 | 893 | ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap); |
f0b85168 | 894 | if (ret < 0) |
9f309c86 | 895 | ret = nfs_map_numeric_to_string(id, buf, buflen); |
f0b85168 | 896 | return ret; |
1da177e4 | 897 | } |