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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 */
36#include <linux/types.h>
37#include <linux/parser.h>
38#include <linux/fs.h>
39#include <linux/nfs_idmap.h>
40#include <net/net_namespace.h>
41#include <linux/sunrpc/rpc_pipe_fs.h>
42#include <linux/nfs_fs.h>
43#include <linux/nfs_fs_sb.h>
44#include <linux/key.h>
45#include <linux/keyctl.h>
46#include <linux/key-type.h>
47#include <keys/user-type.h>
48#include <linux/module.h>
49
50#include "internal.h"
51#include "netns.h"
52
53#define NFS_UINT_MAXLEN 11
54
55/* Default cache timeout is 10 minutes */
56unsigned int nfs_idmap_cache_timeout = 600;
57static const struct cred *id_resolver_cache;
58static struct key_type key_type_id_resolver_legacy;
59
60struct idmap {
61 struct rpc_pipe *idmap_pipe;
62 struct key_construction *idmap_key_cons;
63 struct mutex idmap_mutex;
64};
65
66struct idmap_legacy_upcalldata {
67 struct rpc_pipe_msg pipe_msg;
68 struct idmap_msg idmap_msg;
69 struct idmap *idmap;
70};
71
72/**
73 * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
74 * @fattr: fully initialised struct nfs_fattr
75 * @owner_name: owner name string cache
76 * @group_name: group name string cache
77 */
78void nfs_fattr_init_names(struct nfs_fattr *fattr,
79 struct nfs4_string *owner_name,
80 struct nfs4_string *group_name)
81{
82 fattr->owner_name = owner_name;
83 fattr->group_name = group_name;
84}
85
86static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
87{
88 fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
89 kfree(fattr->owner_name->data);
90}
91
92static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
93{
94 fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
95 kfree(fattr->group_name->data);
96}
97
98static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
99{
100 struct nfs4_string *owner = fattr->owner_name;
101 __u32 uid;
102
103 if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
104 return false;
105 if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
106 fattr->uid = uid;
107 fattr->valid |= NFS_ATTR_FATTR_OWNER;
108 }
109 return true;
110}
111
112static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
113{
114 struct nfs4_string *group = fattr->group_name;
115 __u32 gid;
116
117 if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
118 return false;
119 if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
120 fattr->gid = gid;
121 fattr->valid |= NFS_ATTR_FATTR_GROUP;
122 }
123 return true;
124}
125
126/**
127 * nfs_fattr_free_names - free up the NFSv4 owner and group strings
128 * @fattr: a fully initialised nfs_fattr structure
129 */
130void nfs_fattr_free_names(struct nfs_fattr *fattr)
131{
132 if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
133 nfs_fattr_free_owner_name(fattr);
134 if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
135 nfs_fattr_free_group_name(fattr);
136}
137
138/**
139 * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free
140 * @server: pointer to the filesystem nfs_server structure
141 * @fattr: a fully initialised nfs_fattr structure
142 *
143 * This helper maps the cached NFSv4 owner/group strings in fattr into
144 * their numeric uid/gid equivalents, and then frees the cached strings.
145 */
146void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
147{
148 if (nfs_fattr_map_owner_name(server, fattr))
149 nfs_fattr_free_owner_name(fattr);
150 if (nfs_fattr_map_group_name(server, fattr))
151 nfs_fattr_free_group_name(fattr);
152}
153
154static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
155{
156 unsigned long val;
157 char buf[16];
158
159 if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf))
160 return 0;
161 memcpy(buf, name, namelen);
162 buf[namelen] = '\0';
163 if (strict_strtoul(buf, 0, &val) != 0)
164 return 0;
165 *res = val;
166 return 1;
167}
168
169static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
170{
171 return snprintf(buf, buflen, "%u", id);
172}
173
174static struct key_type key_type_id_resolver = {
175 .name = "id_resolver",
176 .instantiate = user_instantiate,
177 .match = user_match,
178 .revoke = user_revoke,
179 .destroy = user_destroy,
180 .describe = user_describe,
181 .read = user_read,
182};
183
184static int nfs_idmap_init_keyring(void)
185{
186 struct cred *cred;
187 struct key *keyring;
188 int ret = 0;
189
190 printk(KERN_NOTICE "NFS: Registering the %s key type\n",
191 key_type_id_resolver.name);
192
193 cred = prepare_kernel_cred(NULL);
194 if (!cred)
195 return -ENOMEM;
196
197 keyring = key_alloc(&key_type_keyring, ".id_resolver", 0, 0, cred,
198 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
199 KEY_USR_VIEW | KEY_USR_READ,
200 KEY_ALLOC_NOT_IN_QUOTA);
201 if (IS_ERR(keyring)) {
202 ret = PTR_ERR(keyring);
203 goto failed_put_cred;
204 }
205
206 ret = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL);
207 if (ret < 0)
208 goto failed_put_key;
209
210 ret = register_key_type(&key_type_id_resolver);
211 if (ret < 0)
212 goto failed_put_key;
213
214 ret = register_key_type(&key_type_id_resolver_legacy);
215 if (ret < 0)
216 goto failed_reg_legacy;
217
218 set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags);
219 cred->thread_keyring = keyring;
220 cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
221 id_resolver_cache = cred;
222 return 0;
223
224failed_reg_legacy:
225 unregister_key_type(&key_type_id_resolver);
226failed_put_key:
227 key_put(keyring);
228failed_put_cred:
229 put_cred(cred);
230 return ret;
231}
232
233static void nfs_idmap_quit_keyring(void)
234{
235 key_revoke(id_resolver_cache->thread_keyring);
236 unregister_key_type(&key_type_id_resolver);
237 unregister_key_type(&key_type_id_resolver_legacy);
238 put_cred(id_resolver_cache);
239}
240
241/*
242 * Assemble the description to pass to request_key()
243 * This function will allocate a new string and update dest to point
244 * at it. The caller is responsible for freeing dest.
245 *
246 * On error 0 is returned. Otherwise, the length of dest is returned.
247 */
248static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
249 const char *type, size_t typelen, char **desc)
250{
251 char *cp;
252 size_t desclen = typelen + namelen + 2;
253
254 *desc = kmalloc(desclen, GFP_KERNEL);
255 if (!*desc)
256 return -ENOMEM;
257
258 cp = *desc;
259 memcpy(cp, type, typelen);
260 cp += typelen;
261 *cp++ = ':';
262
263 memcpy(cp, name, namelen);
264 cp += namelen;
265 *cp = '\0';
266 return desclen;
267}
268
269static ssize_t nfs_idmap_request_key(struct key_type *key_type,
270 const char *name, size_t namelen,
271 const char *type, void *data,
272 size_t data_size, struct idmap *idmap)
273{
274 const struct cred *saved_cred;
275 struct key *rkey;
276 char *desc;
277 struct user_key_payload *payload;
278 ssize_t ret;
279
280 ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
281 if (ret <= 0)
282 goto out;
283
284 saved_cred = override_creds(id_resolver_cache);
285 if (idmap)
286 rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap);
287 else
288 rkey = request_key(&key_type_id_resolver, desc, "");
289 revert_creds(saved_cred);
290
291 kfree(desc);
292 if (IS_ERR(rkey)) {
293 ret = PTR_ERR(rkey);
294 goto out;
295 }
296
297 rcu_read_lock();
298 rkey->perm |= KEY_USR_VIEW;
299
300 ret = key_validate(rkey);
301 if (ret < 0)
302 goto out_up;
303
304 payload = rcu_dereference(rkey->payload.data);
305 if (IS_ERR_OR_NULL(payload)) {
306 ret = PTR_ERR(payload);
307 goto out_up;
308 }
309
310 ret = payload->datalen;
311 if (ret > 0 && ret <= data_size)
312 memcpy(data, payload->data, ret);
313 else
314 ret = -EINVAL;
315
316out_up:
317 rcu_read_unlock();
318 key_put(rkey);
319out:
320 return ret;
321}
322
323static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
324 const char *type, void *data,
325 size_t data_size, struct idmap *idmap)
326{
327 ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver,
328 name, namelen, type, data,
329 data_size, NULL);
330 if (ret < 0) {
331 mutex_lock(&idmap->idmap_mutex);
332 ret = nfs_idmap_request_key(&key_type_id_resolver_legacy,
333 name, namelen, type, data,
334 data_size, idmap);
335 idmap->idmap_key_cons = NULL;
336 mutex_unlock(&idmap->idmap_mutex);
337 }
338 return ret;
339}
340
341/* ID -> Name */
342static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
343 size_t buflen, struct idmap *idmap)
344{
345 char id_str[NFS_UINT_MAXLEN];
346 int id_len;
347 ssize_t ret;
348
349 id_len = snprintf(id_str, sizeof(id_str), "%u", id);
350 ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
351 if (ret < 0)
352 return -EINVAL;
353 return ret;
354}
355
356/* Name -> ID */
357static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
358 __u32 *id, struct idmap *idmap)
359{
360 char id_str[NFS_UINT_MAXLEN];
361 long id_long;
362 ssize_t data_size;
363 int ret = 0;
364
365 data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap);
366 if (data_size <= 0) {
367 ret = -EINVAL;
368 } else {
369 ret = strict_strtol(id_str, 10, &id_long);
370 *id = (__u32)id_long;
371 }
372 return ret;
373}
374
375/* idmap classic begins here */
376module_param(nfs_idmap_cache_timeout, int, 0644);
377
378enum {
379 Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
380};
381
382static const match_table_t nfs_idmap_tokens = {
383 { Opt_find_uid, "uid:%s" },
384 { Opt_find_gid, "gid:%s" },
385 { Opt_find_user, "user:%s" },
386 { Opt_find_group, "group:%s" },
387 { Opt_find_err, NULL }
388};
389
390static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *);
391static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
392 size_t);
393static void idmap_release_pipe(struct inode *);
394static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
395
396static const struct rpc_pipe_ops idmap_upcall_ops = {
397 .upcall = rpc_pipe_generic_upcall,
398 .downcall = idmap_pipe_downcall,
399 .release_pipe = idmap_release_pipe,
400 .destroy_msg = idmap_pipe_destroy_msg,
401};
402
403static struct key_type key_type_id_resolver_legacy = {
404 .name = "id_legacy",
405 .instantiate = user_instantiate,
406 .match = user_match,
407 .revoke = user_revoke,
408 .destroy = user_destroy,
409 .describe = user_describe,
410 .read = user_read,
411 .request_key = nfs_idmap_legacy_upcall,
412};
413
414static void __nfs_idmap_unregister(struct rpc_pipe *pipe)
415{
416 if (pipe->dentry)
417 rpc_unlink(pipe->dentry);
418}
419
420static int __nfs_idmap_register(struct dentry *dir,
421 struct idmap *idmap,
422 struct rpc_pipe *pipe)
423{
424 struct dentry *dentry;
425
426 dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe);
427 if (IS_ERR(dentry))
428 return PTR_ERR(dentry);
429 pipe->dentry = dentry;
430 return 0;
431}
432
433static void nfs_idmap_unregister(struct nfs_client *clp,
434 struct rpc_pipe *pipe)
435{
436 struct net *net = clp->cl_net;
437 struct super_block *pipefs_sb;
438
439 pipefs_sb = rpc_get_sb_net(net);
440 if (pipefs_sb) {
441 __nfs_idmap_unregister(pipe);
442 rpc_put_sb_net(net);
443 }
444}
445
446static int nfs_idmap_register(struct nfs_client *clp,
447 struct idmap *idmap,
448 struct rpc_pipe *pipe)
449{
450 struct net *net = clp->cl_net;
451 struct super_block *pipefs_sb;
452 int err = 0;
453
454 pipefs_sb = rpc_get_sb_net(net);
455 if (pipefs_sb) {
456 if (clp->cl_rpcclient->cl_dentry)
457 err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
458 idmap, pipe);
459 rpc_put_sb_net(net);
460 }
461 return err;
462}
463
464int
465nfs_idmap_new(struct nfs_client *clp)
466{
467 struct idmap *idmap;
468 struct rpc_pipe *pipe;
469 int error;
470
471 BUG_ON(clp->cl_idmap != NULL);
472
473 idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
474 if (idmap == NULL)
475 return -ENOMEM;
476
477 pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
478 if (IS_ERR(pipe)) {
479 error = PTR_ERR(pipe);
480 kfree(idmap);
481 return error;
482 }
483 error = nfs_idmap_register(clp, idmap, pipe);
484 if (error) {
485 rpc_destroy_pipe_data(pipe);
486 kfree(idmap);
487 return error;
488 }
489 idmap->idmap_pipe = pipe;
490 mutex_init(&idmap->idmap_mutex);
491
492 clp->cl_idmap = idmap;
493 return 0;
494}
495
496void
497nfs_idmap_delete(struct nfs_client *clp)
498{
499 struct idmap *idmap = clp->cl_idmap;
500
501 if (!idmap)
502 return;
503 nfs_idmap_unregister(clp, idmap->idmap_pipe);
504 rpc_destroy_pipe_data(idmap->idmap_pipe);
505 clp->cl_idmap = NULL;
506 kfree(idmap);
507}
508
509static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event,
510 struct super_block *sb)
511{
512 int err = 0;
513
514 switch (event) {
515 case RPC_PIPEFS_MOUNT:
516 BUG_ON(clp->cl_rpcclient->cl_dentry == NULL);
517 err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
518 clp->cl_idmap,
519 clp->cl_idmap->idmap_pipe);
520 break;
521 case RPC_PIPEFS_UMOUNT:
522 if (clp->cl_idmap->idmap_pipe) {
523 struct dentry *parent;
524
525 parent = clp->cl_idmap->idmap_pipe->dentry->d_parent;
526 __nfs_idmap_unregister(clp->cl_idmap->idmap_pipe);
527 /*
528 * Note: This is a dirty hack. SUNRPC hook has been
529 * called already but simple_rmdir() call for the
530 * directory returned with error because of idmap pipe
531 * inside. Thus now we have to remove this directory
532 * here.
533 */
534 if (rpc_rmdir(parent))
535 printk(KERN_ERR "NFS: %s: failed to remove "
536 "clnt dir!\n", __func__);
537 }
538 break;
539 default:
540 printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__,
541 event);
542 return -ENOTSUPP;
543 }
544 return err;
545}
546
547static struct nfs_client *nfs_get_client_for_event(struct net *net, int event)
548{
549 struct nfs_net *nn = net_generic(net, nfs_net_id);
550 struct dentry *cl_dentry;
551 struct nfs_client *clp;
552 int err;
553
554restart:
555 spin_lock(&nn->nfs_client_lock);
556 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
557 /* Wait for initialisation to finish */
558 if (clp->cl_cons_state == NFS_CS_INITING) {
559 atomic_inc(&clp->cl_count);
560 spin_unlock(&nn->nfs_client_lock);
561 err = nfs_wait_client_init_complete(clp);
562 nfs_put_client(clp);
563 if (err)
564 return NULL;
565 goto restart;
566 }
567 /* Skip nfs_clients that failed to initialise */
568 if (clp->cl_cons_state < 0)
569 continue;
570 smp_rmb();
571 if (clp->rpc_ops != &nfs_v4_clientops)
572 continue;
573 cl_dentry = clp->cl_idmap->idmap_pipe->dentry;
574 if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) ||
575 ((event == RPC_PIPEFS_UMOUNT) && !cl_dentry))
576 continue;
577 atomic_inc(&clp->cl_count);
578 spin_unlock(&nn->nfs_client_lock);
579 return clp;
580 }
581 spin_unlock(&nn->nfs_client_lock);
582 return NULL;
583}
584
585static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
586 void *ptr)
587{
588 struct super_block *sb = ptr;
589 struct nfs_client *clp;
590 int error = 0;
591
592 if (!try_module_get(THIS_MODULE))
593 return 0;
594
595 while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) {
596 error = __rpc_pipefs_event(clp, event, sb);
597 nfs_put_client(clp);
598 if (error)
599 break;
600 }
601 module_put(THIS_MODULE);
602 return error;
603}
604
605#define PIPEFS_NFS_PRIO 1
606
607static struct notifier_block nfs_idmap_block = {
608 .notifier_call = rpc_pipefs_event,
609 .priority = SUNRPC_PIPEFS_NFS_PRIO,
610};
611
612int nfs_idmap_init(void)
613{
614 int ret;
615 ret = nfs_idmap_init_keyring();
616 if (ret != 0)
617 goto out;
618 ret = rpc_pipefs_notifier_register(&nfs_idmap_block);
619 if (ret != 0)
620 nfs_idmap_quit_keyring();
621out:
622 return ret;
623}
624
625void nfs_idmap_quit(void)
626{
627 rpc_pipefs_notifier_unregister(&nfs_idmap_block);
628 nfs_idmap_quit_keyring();
629}
630
631static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
632 struct idmap_msg *im,
633 struct rpc_pipe_msg *msg)
634{
635 substring_t substr;
636 int token, ret;
637
638 memset(im, 0, sizeof(*im));
639 memset(msg, 0, sizeof(*msg));
640
641 im->im_type = IDMAP_TYPE_GROUP;
642 token = match_token(desc, nfs_idmap_tokens, &substr);
643
644 switch (token) {
645 case Opt_find_uid:
646 im->im_type = IDMAP_TYPE_USER;
647 case Opt_find_gid:
648 im->im_conv = IDMAP_CONV_NAMETOID;
649 ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
650 break;
651
652 case Opt_find_user:
653 im->im_type = IDMAP_TYPE_USER;
654 case Opt_find_group:
655 im->im_conv = IDMAP_CONV_IDTONAME;
656 ret = match_int(&substr, &im->im_id);
657 break;
658
659 default:
660 ret = -EINVAL;
661 goto out;
662 }
663
664 msg->data = im;
665 msg->len = sizeof(struct idmap_msg);
666
667out:
668 return ret;
669}
670
671static int nfs_idmap_legacy_upcall(struct key_construction *cons,
672 const char *op,
673 void *aux)
674{
675 struct idmap_legacy_upcalldata *data;
676 struct rpc_pipe_msg *msg;
677 struct idmap_msg *im;
678 struct idmap *idmap = (struct idmap *)aux;
679 struct key *key = cons->key;
680 int ret = -ENOMEM;
681
682 /* msg and im are freed in idmap_pipe_destroy_msg */
683 data = kmalloc(sizeof(*data), GFP_KERNEL);
684 if (!data)
685 goto out1;
686
687 msg = &data->pipe_msg;
688 im = &data->idmap_msg;
689 data->idmap = idmap;
690
691 ret = nfs_idmap_prepare_message(key->description, idmap, im, msg);
692 if (ret < 0)
693 goto out2;
694
695 BUG_ON(idmap->idmap_key_cons != NULL);
696 idmap->idmap_key_cons = cons;
697
698 ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
699 if (ret < 0)
700 goto out3;
701
702 return ret;
703
704out3:
705 idmap->idmap_key_cons = NULL;
706out2:
707 kfree(data);
708out1:
709 complete_request_key(cons, ret);
710 return ret;
711}
712
713static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data)
714{
715 return key_instantiate_and_link(key, data, strlen(data) + 1,
716 id_resolver_cache->thread_keyring,
717 authkey);
718}
719
720static int nfs_idmap_read_message(struct idmap_msg *im, struct key *key, struct key *authkey)
721{
722 char id_str[NFS_UINT_MAXLEN];
723 int ret = -EINVAL;
724
725 switch (im->im_conv) {
726 case IDMAP_CONV_NAMETOID:
727 sprintf(id_str, "%d", im->im_id);
728 ret = nfs_idmap_instantiate(key, authkey, id_str);
729 break;
730 case IDMAP_CONV_IDTONAME:
731 ret = nfs_idmap_instantiate(key, authkey, im->im_name);
732 break;
733 }
734
735 return ret;
736}
737
738static ssize_t
739idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
740{
741 struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
742 struct idmap *idmap = (struct idmap *)rpci->private;
743 struct key_construction *cons;
744 struct idmap_msg im;
745 size_t namelen_in;
746 int ret;
747
748 /* If instantiation is successful, anyone waiting for key construction
749 * will have been woken up and someone else may now have used
750 * idmap_key_cons - so after this point we may no longer touch it.
751 */
752 cons = ACCESS_ONCE(idmap->idmap_key_cons);
753 idmap->idmap_key_cons = NULL;
754
755 if (mlen != sizeof(im)) {
756 ret = -ENOSPC;
757 goto out;
758 }
759
760 if (copy_from_user(&im, src, mlen) != 0) {
761 ret = -EFAULT;
762 goto out;
763 }
764
765 if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
766 ret = -ENOKEY;
767 goto out;
768 }
769
770 namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
771 if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
772 ret = -EINVAL;
773 goto out;
774 }
775
776 ret = nfs_idmap_read_message(&im, cons->key, cons->authkey);
777 if (ret >= 0) {
778 key_set_timeout(cons->key, nfs_idmap_cache_timeout);
779 ret = mlen;
780 }
781
782out:
783 complete_request_key(cons, ret);
784 return ret;
785}
786
787static void
788idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
789{
790 struct idmap_legacy_upcalldata *data = container_of(msg,
791 struct idmap_legacy_upcalldata,
792 pipe_msg);
793 struct idmap *idmap = data->idmap;
794 struct key_construction *cons;
795 if (msg->errno) {
796 cons = ACCESS_ONCE(idmap->idmap_key_cons);
797 idmap->idmap_key_cons = NULL;
798 complete_request_key(cons, msg->errno);
799 }
800 /* Free memory allocated in nfs_idmap_legacy_upcall() */
801 kfree(data);
802}
803
804static void
805idmap_release_pipe(struct inode *inode)
806{
807 struct rpc_inode *rpci = RPC_I(inode);
808 struct idmap *idmap = (struct idmap *)rpci->private;
809 idmap->idmap_key_cons = NULL;
810}
811
812int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)
813{
814 struct idmap *idmap = server->nfs_client->cl_idmap;
815
816 if (nfs_map_string_to_numeric(name, namelen, uid))
817 return 0;
818 return nfs_idmap_lookup_id(name, namelen, "uid", uid, idmap);
819}
820
821int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid)
822{
823 struct idmap *idmap = server->nfs_client->cl_idmap;
824
825 if (nfs_map_string_to_numeric(name, namelen, gid))
826 return 0;
827 return nfs_idmap_lookup_id(name, namelen, "gid", gid, idmap);
828}
829
830int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
831{
832 struct idmap *idmap = server->nfs_client->cl_idmap;
833 int ret = -EINVAL;
834
835 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
836 ret = nfs_idmap_lookup_name(uid, "user", buf, buflen, idmap);
837 if (ret < 0)
838 ret = nfs_map_numeric_to_string(uid, buf, buflen);
839 return ret;
840}
841int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen)
842{
843 struct idmap *idmap = server->nfs_client->cl_idmap;
844 int ret = -EINVAL;
845
846 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
847 ret = nfs_idmap_lookup_name(gid, "group", buf, buflen, idmap);
848 if (ret < 0)
849 ret = nfs_map_numeric_to_string(gid, buf, buflen);
850 return ret;
851}