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 <net/net_namespace.h>
40#include <linux/sunrpc/rpc_pipe_fs.h>
41#include <linux/nfs_fs.h>
42#include <linux/nfs_fs_sb.h>
43#include <linux/key.h>
44#include <linux/keyctl.h>
45#include <linux/key-type.h>
46#include <keys/user-type.h>
47#include <keys/request_key_auth-type.h>
48#include <linux/module.h>
49#include <linux/user_namespace.h>
50
51#include "internal.h"
52#include "netns.h"
53#include "nfs4idmap.h"
54#include "nfs4trace.h"
55
56#define NFS_UINT_MAXLEN 11
57
58static const struct cred *id_resolver_cache;
59static struct key_type key_type_id_resolver_legacy;
60
61struct idmap_legacy_upcalldata {
62 struct rpc_pipe_msg pipe_msg;
63 struct idmap_msg idmap_msg;
64 struct key *authkey;
65 struct idmap *idmap;
66};
67
68struct idmap {
69 struct rpc_pipe_dir_object idmap_pdo;
70 struct rpc_pipe *idmap_pipe;
71 struct idmap_legacy_upcalldata *idmap_upcall_data;
72 struct mutex idmap_mutex;
73 struct user_namespace *user_ns;
74};
75
76static struct user_namespace *idmap_userns(const struct idmap *idmap)
77{
78 if (idmap && idmap->user_ns)
79 return idmap->user_ns;
80 return &init_user_ns;
81}
82
83/**
84 * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
85 * @fattr: fully initialised struct nfs_fattr
86 * @owner_name: owner name string cache
87 * @group_name: group name string cache
88 */
89void nfs_fattr_init_names(struct nfs_fattr *fattr,
90 struct nfs4_string *owner_name,
91 struct nfs4_string *group_name)
92{
93 fattr->owner_name = owner_name;
94 fattr->group_name = group_name;
95}
96
97static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
98{
99 fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
100 kfree(objp: fattr->owner_name->data);
101}
102
103static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
104{
105 fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
106 kfree(objp: fattr->group_name->data);
107}
108
109static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
110{
111 struct nfs4_string *owner = fattr->owner_name;
112 kuid_t uid;
113
114 if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
115 return false;
116 if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
117 fattr->uid = uid;
118 fattr->valid |= NFS_ATTR_FATTR_OWNER;
119 }
120 return true;
121}
122
123static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
124{
125 struct nfs4_string *group = fattr->group_name;
126 kgid_t gid;
127
128 if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
129 return false;
130 if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
131 fattr->gid = gid;
132 fattr->valid |= NFS_ATTR_FATTR_GROUP;
133 }
134 return true;
135}
136
137/**
138 * nfs_fattr_free_names - free up the NFSv4 owner and group strings
139 * @fattr: a fully initialised nfs_fattr structure
140 */
141void nfs_fattr_free_names(struct nfs_fattr *fattr)
142{
143 if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
144 nfs_fattr_free_owner_name(fattr);
145 if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
146 nfs_fattr_free_group_name(fattr);
147}
148
149/**
150 * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free
151 * @server: pointer to the filesystem nfs_server structure
152 * @fattr: a fully initialised nfs_fattr structure
153 *
154 * This helper maps the cached NFSv4 owner/group strings in fattr into
155 * their numeric uid/gid equivalents, and then frees the cached strings.
156 */
157void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
158{
159 if (nfs_fattr_map_owner_name(server, fattr))
160 nfs_fattr_free_owner_name(fattr);
161 if (nfs_fattr_map_group_name(server, fattr))
162 nfs_fattr_free_group_name(fattr);
163}
164
165int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
166{
167 unsigned long val;
168 char buf[16];
169
170 if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf))
171 return 0;
172 memcpy(to: buf, from: name, len: namelen);
173 buf[namelen] = '\0';
174 if (kstrtoul(s: buf, base: 0, res: &val) != 0)
175 return 0;
176 *res = val;
177 return 1;
178}
179EXPORT_SYMBOL_GPL(nfs_map_string_to_numeric);
180
181static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
182{
183 return snprintf(buf, size: buflen, fmt: "%u", id);
184}
185
186static struct key_type key_type_id_resolver = {
187 .name = "id_resolver",
188 .preparse = user_preparse,
189 .free_preparse = user_free_preparse,
190 .instantiate = generic_key_instantiate,
191 .revoke = user_revoke,
192 .destroy = user_destroy,
193 .describe = user_describe,
194 .read = user_read,
195};
196
197int nfs_idmap_init(void)
198{
199 struct cred *cred;
200 struct key *keyring;
201 int ret = 0;
202
203 printk(KERN_NOTICE "NFS: Registering the %s key type\n",
204 key_type_id_resolver.name);
205
206 cred = prepare_kernel_cred(&init_task);
207 if (!cred)
208 return -ENOMEM;
209
210 keyring = keyring_alloc(description: ".id_resolver",
211 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
212 perm: (KEY_POS_ALL & ~KEY_POS_SETATTR) |
213 KEY_USR_VIEW | KEY_USR_READ,
214 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
215 if (IS_ERR(keyring)) {
216 ret = PTR_ERR(keyring);
217 goto failed_put_cred;
218 }
219
220 ret = register_key_type(&key_type_id_resolver);
221 if (ret < 0)
222 goto failed_put_key;
223
224 ret = register_key_type(&key_type_id_resolver_legacy);
225 if (ret < 0)
226 goto failed_reg_legacy;
227
228 set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags);
229 cred->thread_keyring = keyring;
230 cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
231 id_resolver_cache = cred;
232 return 0;
233
234failed_reg_legacy:
235 unregister_key_type(&key_type_id_resolver);
236failed_put_key:
237 key_put(keyring);
238failed_put_cred:
239 put_cred(cred);
240 return ret;
241}
242
243void nfs_idmap_quit(void)
244{
245 key_revoke(key: id_resolver_cache->thread_keyring);
246 unregister_key_type(ktype: &key_type_id_resolver);
247 unregister_key_type(ktype: &key_type_id_resolver_legacy);
248 put_cred(cred: id_resolver_cache);
249}
250
251/*
252 * Assemble the description to pass to request_key()
253 * This function will allocate a new string and update dest to point
254 * at it. The caller is responsible for freeing dest.
255 *
256 * On error 0 is returned. Otherwise, the length of dest is returned.
257 */
258static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
259 const char *type, size_t typelen, char **desc)
260{
261 char *cp;
262 size_t desclen = typelen + namelen + 2;
263
264 *desc = kmalloc(desclen, GFP_KERNEL);
265 if (!*desc)
266 return -ENOMEM;
267
268 cp = *desc;
269 memcpy(to: cp, from: type, len: typelen);
270 cp += typelen;
271 *cp++ = ':';
272
273 memcpy(to: cp, from: name, len: namelen);
274 cp += namelen;
275 *cp = '\0';
276 return desclen;
277}
278
279static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
280 const char *type, struct idmap *idmap)
281{
282 char *desc;
283 struct key *rkey = ERR_PTR(error: -EAGAIN);
284 ssize_t ret;
285
286 ret = nfs_idmap_get_desc(name, namelen, type, typelen: strlen(type), desc: &desc);
287 if (ret < 0)
288 return ERR_PTR(error: ret);
289
290 if (!idmap->user_ns || idmap->user_ns == &init_user_ns)
291 rkey = request_key(type: &key_type_id_resolver, description: desc, callout_info: "");
292 if (IS_ERR(ptr: rkey)) {
293 mutex_lock(lock: &idmap->idmap_mutex);
294 rkey = request_key_with_auxdata(type: &key_type_id_resolver_legacy,
295 description: desc, NULL, callout_info: "", callout_len: 0, aux: idmap);
296 mutex_unlock(lock: &idmap->idmap_mutex);
297 }
298 if (!IS_ERR(ptr: rkey))
299 set_bit(KEY_FLAG_ROOT_CAN_INVAL, addr: &rkey->flags);
300
301 kfree(objp: desc);
302 return rkey;
303}
304
305static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
306 const char *type, void *data,
307 size_t data_size, struct idmap *idmap)
308{
309 const struct cred *saved_cred;
310 struct key *rkey;
311 const struct user_key_payload *payload;
312 ssize_t ret;
313
314 saved_cred = override_creds(override_cred: id_resolver_cache);
315 rkey = nfs_idmap_request_key(name, namelen, type, idmap);
316 revert_creds(revert_cred: saved_cred);
317
318 if (IS_ERR(ptr: rkey)) {
319 ret = PTR_ERR(ptr: rkey);
320 goto out;
321 }
322
323 rcu_read_lock();
324 rkey->perm |= KEY_USR_VIEW;
325
326 ret = key_validate(key: rkey);
327 if (ret < 0)
328 goto out_up;
329
330 payload = user_key_payload_rcu(key: rkey);
331 if (IS_ERR_OR_NULL(ptr: payload)) {
332 ret = PTR_ERR(ptr: payload);
333 goto out_up;
334 }
335
336 ret = payload->datalen;
337 if (ret > 0 && ret <= data_size)
338 memcpy(to: data, from: payload->data, len: ret);
339 else
340 ret = -EINVAL;
341
342out_up:
343 rcu_read_unlock();
344 key_put(key: rkey);
345out:
346 return ret;
347}
348
349/* ID -> Name */
350static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
351 size_t buflen, struct idmap *idmap)
352{
353 char id_str[NFS_UINT_MAXLEN];
354 int id_len;
355 ssize_t ret;
356
357 id_len = nfs_map_numeric_to_string(id, buf: id_str, buflen: sizeof(id_str));
358 ret = nfs_idmap_get_key(name: id_str, namelen: id_len, type, data: buf, data_size: buflen, idmap);
359 if (ret < 0)
360 return -EINVAL;
361 return ret;
362}
363
364/* Name -> ID */
365static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
366 __u32 *id, struct idmap *idmap)
367{
368 char id_str[NFS_UINT_MAXLEN];
369 long id_long;
370 ssize_t data_size;
371 int ret = 0;
372
373 data_size = nfs_idmap_get_key(name, namelen, type, data: id_str, NFS_UINT_MAXLEN, idmap);
374 if (data_size <= 0) {
375 ret = -EINVAL;
376 } else {
377 ret = kstrtol(s: id_str, base: 10, res: &id_long);
378 if (!ret)
379 *id = (__u32)id_long;
380 }
381 return ret;
382}
383
384/* idmap classic begins here */
385
386enum {
387 Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
388};
389
390static const match_table_t nfs_idmap_tokens = {
391 { Opt_find_uid, "uid:%s" },
392 { .token: Opt_find_gid, .pattern: "gid:%s" },
393 { .token: Opt_find_user, .pattern: "user:%s" },
394 { .token: Opt_find_group, .pattern: "group:%s" },
395 { .token: Opt_find_err, NULL }
396};
397
398static int nfs_idmap_legacy_upcall(struct key *, void *);
399static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
400 size_t);
401static void idmap_release_pipe(struct inode *);
402static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
403
404static const struct rpc_pipe_ops idmap_upcall_ops = {
405 .upcall = rpc_pipe_generic_upcall,
406 .downcall = idmap_pipe_downcall,
407 .release_pipe = idmap_release_pipe,
408 .destroy_msg = idmap_pipe_destroy_msg,
409};
410
411static struct key_type key_type_id_resolver_legacy = {
412 .name = "id_legacy",
413 .preparse = user_preparse,
414 .free_preparse = user_free_preparse,
415 .instantiate = generic_key_instantiate,
416 .revoke = user_revoke,
417 .destroy = user_destroy,
418 .describe = user_describe,
419 .read = user_read,
420 .request_key = nfs_idmap_legacy_upcall,
421};
422
423static void nfs_idmap_pipe_destroy(struct dentry *dir,
424 struct rpc_pipe_dir_object *pdo)
425{
426 struct idmap *idmap = pdo->pdo_data;
427
428 rpc_unlink(idmap->idmap_pipe);
429}
430
431static int nfs_idmap_pipe_create(struct dentry *dir,
432 struct rpc_pipe_dir_object *pdo)
433{
434 struct idmap *idmap = pdo->pdo_data;
435
436 return rpc_mkpipe_dentry(dir, "idmap", idmap, idmap->idmap_pipe);
437}
438
439static const struct rpc_pipe_dir_object_ops nfs_idmap_pipe_dir_object_ops = {
440 .create = nfs_idmap_pipe_create,
441 .destroy = nfs_idmap_pipe_destroy,
442};
443
444int
445nfs_idmap_new(struct nfs_client *clp)
446{
447 struct idmap *idmap;
448 struct rpc_pipe *pipe;
449 int error;
450
451 idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
452 if (idmap == NULL)
453 return -ENOMEM;
454
455 mutex_init(&idmap->idmap_mutex);
456 idmap->user_ns = get_user_ns(ns: clp->cl_rpcclient->cl_cred->user_ns);
457
458 rpc_init_pipe_dir_object(pdo: &idmap->idmap_pdo,
459 pdo_ops: &nfs_idmap_pipe_dir_object_ops,
460 pdo_data: idmap);
461
462 pipe = rpc_mkpipe_data(ops: &idmap_upcall_ops, flags: 0);
463 if (IS_ERR(ptr: pipe)) {
464 error = PTR_ERR(ptr: pipe);
465 goto err;
466 }
467 idmap->idmap_pipe = pipe;
468
469 error = rpc_add_pipe_dir_object(net: clp->cl_net,
470 pdh: &clp->cl_rpcclient->cl_pipedir_objects,
471 pdo: &idmap->idmap_pdo);
472 if (error)
473 goto err_destroy_pipe;
474
475 clp->cl_idmap = idmap;
476 return 0;
477err_destroy_pipe:
478 rpc_destroy_pipe_data(pipe: idmap->idmap_pipe);
479err:
480 put_user_ns(ns: idmap->user_ns);
481 kfree(objp: idmap);
482 return error;
483}
484
485void
486nfs_idmap_delete(struct nfs_client *clp)
487{
488 struct idmap *idmap = clp->cl_idmap;
489
490 if (!idmap)
491 return;
492 clp->cl_idmap = NULL;
493 rpc_remove_pipe_dir_object(net: clp->cl_net,
494 pdh: &clp->cl_rpcclient->cl_pipedir_objects,
495 pdo: &idmap->idmap_pdo);
496 rpc_destroy_pipe_data(pipe: idmap->idmap_pipe);
497 put_user_ns(ns: idmap->user_ns);
498 kfree(objp: idmap);
499}
500
501static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
502 struct idmap_msg *im,
503 struct rpc_pipe_msg *msg)
504{
505 substring_t substr;
506 int token, ret;
507
508 im->im_type = IDMAP_TYPE_GROUP;
509 token = match_token(desc, table: nfs_idmap_tokens, args: &substr);
510
511 switch (token) {
512 case Opt_find_uid:
513 im->im_type = IDMAP_TYPE_USER;
514 fallthrough;
515 case Opt_find_gid:
516 im->im_conv = IDMAP_CONV_NAMETOID;
517 ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
518 break;
519
520 case Opt_find_user:
521 im->im_type = IDMAP_TYPE_USER;
522 fallthrough;
523 case Opt_find_group:
524 im->im_conv = IDMAP_CONV_IDTONAME;
525 ret = match_int(&substr, result: &im->im_id);
526 if (ret)
527 goto out;
528 break;
529
530 default:
531 ret = -EINVAL;
532 goto out;
533 }
534
535 msg->data = im;
536 msg->len = sizeof(struct idmap_msg);
537
538out:
539 return ret;
540}
541
542static bool
543nfs_idmap_prepare_pipe_upcall(struct idmap *idmap,
544 struct idmap_legacy_upcalldata *data)
545{
546 if (idmap->idmap_upcall_data != NULL) {
547 WARN_ON_ONCE(1);
548 return false;
549 }
550 idmap->idmap_upcall_data = data;
551 return true;
552}
553
554static void nfs_idmap_complete_pipe_upcall(struct idmap_legacy_upcalldata *data,
555 int ret)
556{
557 complete_request_key(authkey: data->authkey, error: ret);
558 key_put(key: data->authkey);
559 kfree(objp: data);
560}
561
562static void nfs_idmap_abort_pipe_upcall(struct idmap *idmap,
563 struct idmap_legacy_upcalldata *data,
564 int ret)
565{
566 if (cmpxchg(&idmap->idmap_upcall_data, data, NULL) == data)
567 nfs_idmap_complete_pipe_upcall(data, ret);
568}
569
570static int nfs_idmap_legacy_upcall(struct key *authkey, void *aux)
571{
572 struct idmap_legacy_upcalldata *data;
573 struct request_key_auth *rka = get_request_key_auth(key: authkey);
574 struct rpc_pipe_msg *msg;
575 struct idmap_msg *im;
576 struct idmap *idmap = aux;
577 struct key *key = rka->target_key;
578 int ret = -ENOKEY;
579
580 if (!aux)
581 goto out1;
582
583 /* msg and im are freed in idmap_pipe_destroy_msg */
584 ret = -ENOMEM;
585 data = kzalloc(sizeof(*data), GFP_KERNEL);
586 if (!data)
587 goto out1;
588
589 msg = &data->pipe_msg;
590 im = &data->idmap_msg;
591 data->idmap = idmap;
592 data->authkey = key_get(key: authkey);
593
594 ret = nfs_idmap_prepare_message(desc: key->description, idmap, im, msg);
595 if (ret < 0)
596 goto out2;
597
598 ret = -EAGAIN;
599 if (!nfs_idmap_prepare_pipe_upcall(idmap, data))
600 goto out2;
601
602 ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
603 if (ret < 0)
604 nfs_idmap_abort_pipe_upcall(idmap, data, ret);
605
606 return ret;
607out2:
608 kfree(objp: data);
609out1:
610 complete_request_key(authkey, error: ret);
611 return ret;
612}
613
614static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen)
615{
616 return key_instantiate_and_link(key, data, datalen,
617 keyring: id_resolver_cache->thread_keyring,
618 authkey);
619}
620
621static int nfs_idmap_read_and_verify_message(struct idmap_msg *im,
622 struct idmap_msg *upcall,
623 struct key *key, struct key *authkey)
624{
625 char id_str[NFS_UINT_MAXLEN];
626 size_t len;
627 int ret = -ENOKEY;
628
629 /* ret = -ENOKEY */
630 if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv)
631 goto out;
632 switch (im->im_conv) {
633 case IDMAP_CONV_NAMETOID:
634 if (strcmp(upcall->im_name, im->im_name) != 0)
635 break;
636 /* Note: here we store the NUL terminator too */
637 len = 1 + nfs_map_numeric_to_string(id: im->im_id, buf: id_str,
638 buflen: sizeof(id_str));
639 ret = nfs_idmap_instantiate(key, authkey, data: id_str, datalen: len);
640 break;
641 case IDMAP_CONV_IDTONAME:
642 if (upcall->im_id != im->im_id)
643 break;
644 len = strlen(im->im_name);
645 ret = nfs_idmap_instantiate(key, authkey, data: im->im_name, datalen: len);
646 break;
647 default:
648 ret = -EINVAL;
649 }
650out:
651 return ret;
652}
653
654static ssize_t
655idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
656{
657 struct request_key_auth *rka;
658 struct rpc_inode *rpci = RPC_I(inode: file_inode(f: filp));
659 struct idmap *idmap = (struct idmap *)rpci->private;
660 struct idmap_legacy_upcalldata *data;
661 struct key *authkey;
662 struct idmap_msg im;
663 size_t namelen_in;
664 int ret = -ENOKEY;
665
666 /* If instantiation is successful, anyone waiting for key construction
667 * will have been woken up and someone else may now have used
668 * idmap_key_cons - so after this point we may no longer touch it.
669 */
670 data = xchg(&idmap->idmap_upcall_data, NULL);
671 if (data == NULL)
672 goto out_noupcall;
673
674 authkey = data->authkey;
675 rka = get_request_key_auth(key: authkey);
676
677 if (mlen != sizeof(im)) {
678 ret = -ENOSPC;
679 goto out;
680 }
681
682 if (copy_from_user(to: &im, from: src, n: mlen) != 0) {
683 ret = -EFAULT;
684 goto out;
685 }
686
687 if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
688 ret = -ENOKEY;
689 goto out;
690 }
691
692 namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
693 if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
694 ret = -EINVAL;
695 goto out;
696 }
697
698 ret = nfs_idmap_read_and_verify_message(im: &im, upcall: &data->idmap_msg,
699 key: rka->target_key, authkey);
700 if (ret >= 0) {
701 key_set_timeout(rka->target_key, nfs_idmap_cache_timeout);
702 ret = mlen;
703 }
704
705out:
706 nfs_idmap_complete_pipe_upcall(data, ret);
707out_noupcall:
708 return ret;
709}
710
711static void
712idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
713{
714 struct idmap_legacy_upcalldata *data = container_of(msg,
715 struct idmap_legacy_upcalldata,
716 pipe_msg);
717 struct idmap *idmap = data->idmap;
718
719 if (msg->errno)
720 nfs_idmap_abort_pipe_upcall(idmap, data, ret: msg->errno);
721}
722
723static void
724idmap_release_pipe(struct inode *inode)
725{
726 struct rpc_inode *rpci = RPC_I(inode);
727 struct idmap *idmap = (struct idmap *)rpci->private;
728 struct idmap_legacy_upcalldata *data;
729
730 data = xchg(&idmap->idmap_upcall_data, NULL);
731 if (data)
732 nfs_idmap_complete_pipe_upcall(data, ret: -EPIPE);
733}
734
735int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid)
736{
737 struct idmap *idmap = server->nfs_client->cl_idmap;
738 __u32 id = -1;
739 int ret = 0;
740
741 if (!nfs_map_string_to_numeric(name, namelen, &id))
742 ret = nfs_idmap_lookup_id(name, namelen, type: "uid", id: &id, idmap);
743 if (ret == 0) {
744 *uid = make_kuid(from: idmap_userns(idmap), uid: id);
745 if (!uid_valid(uid: *uid))
746 ret = -ERANGE;
747 }
748 trace_nfs4_map_name_to_uid(nfs4_map_name_to_uid: name, len: namelen, id, error: ret);
749 return ret;
750}
751
752int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid)
753{
754 struct idmap *idmap = server->nfs_client->cl_idmap;
755 __u32 id = -1;
756 int ret = 0;
757
758 if (!nfs_map_string_to_numeric(name, namelen, &id))
759 ret = nfs_idmap_lookup_id(name, namelen, type: "gid", id: &id, idmap);
760 if (ret == 0) {
761 *gid = make_kgid(from: idmap_userns(idmap), gid: id);
762 if (!gid_valid(gid: *gid))
763 ret = -ERANGE;
764 }
765 trace_nfs4_map_group_to_gid(nfs4_map_group_to_gid: name, len: namelen, id, error: ret);
766 return ret;
767}
768
769int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen)
770{
771 struct idmap *idmap = server->nfs_client->cl_idmap;
772 int ret = -EINVAL;
773 __u32 id;
774
775 id = from_kuid_munged(to: idmap_userns(idmap), kuid: uid);
776 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
777 ret = nfs_idmap_lookup_name(id, type: "user", buf, buflen, idmap);
778 if (ret < 0)
779 ret = nfs_map_numeric_to_string(id, buf, buflen);
780 trace_nfs4_map_uid_to_name(nfs4_map_uid_to_name: buf, len: ret, id, error: ret);
781 return ret;
782}
783int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen)
784{
785 struct idmap *idmap = server->nfs_client->cl_idmap;
786 int ret = -EINVAL;
787 __u32 id;
788
789 id = from_kgid_munged(to: idmap_userns(idmap), kgid: gid);
790 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
791 ret = nfs_idmap_lookup_name(id, type: "group", buf, buflen, idmap);
792 if (ret < 0)
793 ret = nfs_map_numeric_to_string(id, buf, buflen);
794 trace_nfs4_map_gid_to_group(nfs4_map_gid_to_group: buf, len: ret, id, error: ret);
795 return ret;
796}
797