nfs4idmap.c

  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(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(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(buf, name, namelen);
173	buf[namelen] = '\0';
174	if (kstrtoul(buf, 0, &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, buflen, "%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(".id_resolver",
211				GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
212				(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(id_resolver_cache->thread_keyring);
246	unregister_key_type(&key_type_id_resolver);
247	unregister_key_type(&key_type_id_resolver_legacy);
248	put_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(cp, type, typelen);
270	cp += typelen;
271	*cp++ = ':';
272
273	memcpy(cp, name, 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(-EAGAIN);
284	ssize_t ret;
285
286	ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
287	if (ret < 0)
288		return ERR_PTR(ret);
289
290	if (!idmap->user_ns || idmap->user_ns == &init_user_ns)
291		rkey = request_key(&key_type_id_resolver, desc, "");
292	if (IS_ERR(rkey)) {
293		mutex_lock(&idmap->idmap_mutex);
294		rkey = request_key_with_auxdata(&key_type_id_resolver_legacy,
295						desc, NULL, "", 0, idmap);
296		mutex_unlock(&idmap->idmap_mutex);
297	}
298	if (!IS_ERR(rkey))
299		set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);
300
301	kfree(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	struct key *rkey;
310	const struct user_key_payload *payload;
311	ssize_t ret;
312
313	scoped_with_creds(id_resolver_cache)
314		rkey = nfs_idmap_request_key(name, namelen, type, idmap);
315	if (IS_ERR(rkey)) {
316		ret = PTR_ERR(rkey);
317		goto out;
318	}
319
320	rcu_read_lock();
321	rkey->perm |= KEY_USR_VIEW;
322
323	ret = key_validate(rkey);
324	if (ret < 0)
325		goto out_up;
326
327	payload = user_key_payload_rcu(rkey);
328	if (IS_ERR_OR_NULL(payload)) {
329		ret = PTR_ERR(payload);
330		goto out_up;
331	}
332
333	ret = payload->datalen;
334	if (ret > 0 && ret <= data_size)
335		memcpy(data, payload->data, ret);
336	else
337		ret = -EINVAL;
338
339out_up:
340	rcu_read_unlock();
341	key_put(rkey);
342out:
343	return ret;
344}
345
346/* ID -> Name */
347static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
348				     size_t buflen, struct idmap *idmap)
349{
350	char id_str[NFS_UINT_MAXLEN];
351	int id_len;
352	ssize_t ret;
353
354	id_len = nfs_map_numeric_to_string(id, id_str, sizeof(id_str));
355	ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
356	if (ret < 0)
357		return -EINVAL;
358	return ret;
359}
360
361/* Name -> ID */
362static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
363			       __u32 *id, struct idmap *idmap)
364{
365	char id_str[NFS_UINT_MAXLEN];
366	long id_long;
367	ssize_t data_size;
368	int ret = 0;
369
370	data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap);
371	if (data_size <= 0) {
372		ret = -EINVAL;
373	} else {
374		ret = kstrtol(id_str, 10, &id_long);
375		if (!ret)
376			*id = (__u32)id_long;
377	}
378	return ret;
379}
380
381/* idmap classic begins here */
382
383enum {
384	Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
385};
386
387static const match_table_t nfs_idmap_tokens = {
388	{ Opt_find_uid, "uid:%s" },
389	{ Opt_find_gid, "gid:%s" },
390	{ Opt_find_user, "user:%s" },
391	{ Opt_find_group, "group:%s" },
392	{ Opt_find_err, NULL }
393};
394
395static int nfs_idmap_legacy_upcall(struct key *, void *);
396static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
397				   size_t);
398static void idmap_release_pipe(struct inode *);
399static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
400
401static const struct rpc_pipe_ops idmap_upcall_ops = {
402	.upcall		= rpc_pipe_generic_upcall,
403	.downcall	= idmap_pipe_downcall,
404	.release_pipe	= idmap_release_pipe,
405	.destroy_msg	= idmap_pipe_destroy_msg,
406};
407
408static struct key_type key_type_id_resolver_legacy = {
409	.name		= "id_legacy",
410	.preparse	= user_preparse,
411	.free_preparse	= user_free_preparse,
412	.instantiate	= generic_key_instantiate,
413	.revoke		= user_revoke,
414	.destroy	= user_destroy,
415	.describe	= user_describe,
416	.read		= user_read,
417	.request_key	= nfs_idmap_legacy_upcall,
418};
419
420static void nfs_idmap_pipe_destroy(struct dentry *dir,
421		struct rpc_pipe_dir_object *pdo)
422{
423	struct idmap *idmap = pdo->pdo_data;
424
425	rpc_unlink(idmap->idmap_pipe);
426}
427
428static int nfs_idmap_pipe_create(struct dentry *dir,
429		struct rpc_pipe_dir_object *pdo)
430{
431	struct idmap *idmap = pdo->pdo_data;
432
433	return rpc_mkpipe_dentry(dir, "idmap", idmap, idmap->idmap_pipe);
434}
435
436static const struct rpc_pipe_dir_object_ops nfs_idmap_pipe_dir_object_ops = {
437	.create = nfs_idmap_pipe_create,
438	.destroy = nfs_idmap_pipe_destroy,
439};
440
441int
442nfs_idmap_new(struct nfs_client *clp)
443{
444	struct idmap *idmap;
445	struct rpc_pipe *pipe;
446	int error;
447
448	idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
449	if (idmap == NULL)
450		return -ENOMEM;
451
452	mutex_init(&idmap->idmap_mutex);
453	idmap->user_ns = get_user_ns(clp->cl_rpcclient->cl_cred->user_ns);
454
455	rpc_init_pipe_dir_object(&idmap->idmap_pdo,
456			&nfs_idmap_pipe_dir_object_ops,
457			idmap);
458
459	pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
460	if (IS_ERR(pipe)) {
461		error = PTR_ERR(pipe);
462		goto err;
463	}
464	idmap->idmap_pipe = pipe;
465
466	error = rpc_add_pipe_dir_object(clp->cl_net,
467			&clp->cl_rpcclient->cl_pipedir_objects,
468			&idmap->idmap_pdo);
469	if (error)
470		goto err_destroy_pipe;
471
472	clp->cl_idmap = idmap;
473	return 0;
474err_destroy_pipe:
475	rpc_destroy_pipe_data(idmap->idmap_pipe);
476err:
477	put_user_ns(idmap->user_ns);
478	kfree(idmap);
479	return error;
480}
481
482void
483nfs_idmap_delete(struct nfs_client *clp)
484{
485	struct idmap *idmap = clp->cl_idmap;
486
487	if (!idmap)
488		return;
489	clp->cl_idmap = NULL;
490	rpc_remove_pipe_dir_object(clp->cl_net,
491			&clp->cl_rpcclient->cl_pipedir_objects,
492			&idmap->idmap_pdo);
493	rpc_destroy_pipe_data(idmap->idmap_pipe);
494	put_user_ns(idmap->user_ns);
495	kfree(idmap);
496}
497
498static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
499				     struct idmap_msg *im,
500				     struct rpc_pipe_msg *msg)
501{
502	substring_t substr;
503	int token, ret;
504
505	im->im_type = IDMAP_TYPE_GROUP;
506	token = match_token(desc, nfs_idmap_tokens, &substr);
507
508	switch (token) {
509	case Opt_find_uid:
510		im->im_type = IDMAP_TYPE_USER;
511		fallthrough;
512	case Opt_find_gid:
513		im->im_conv = IDMAP_CONV_NAMETOID;
514		ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
515		break;
516
517	case Opt_find_user:
518		im->im_type = IDMAP_TYPE_USER;
519		fallthrough;
520	case Opt_find_group:
521		im->im_conv = IDMAP_CONV_IDTONAME;
522		ret = match_int(&substr, &im->im_id);
523		if (ret)
524			goto out;
525		break;
526
527	default:
528		ret = -EINVAL;
529		goto out;
530	}
531
532	msg->data = im;
533	msg->len  = sizeof(struct idmap_msg);
534
535out:
536	return ret;
537}
538
539static bool
540nfs_idmap_prepare_pipe_upcall(struct idmap *idmap,
541		struct idmap_legacy_upcalldata *data)
542{
543	if (idmap->idmap_upcall_data != NULL) {
544		WARN_ON_ONCE(1);
545		return false;
546	}
547	idmap->idmap_upcall_data = data;
548	return true;
549}
550
551static void nfs_idmap_complete_pipe_upcall(struct idmap_legacy_upcalldata *data,
552					   int ret)
553{
554	complete_request_key(data->authkey, ret);
555	key_put(data->authkey);
556	kfree(data);
557}
558
559static void nfs_idmap_abort_pipe_upcall(struct idmap *idmap,
560					struct idmap_legacy_upcalldata *data,
561					int ret)
562{
563	if (cmpxchg(&idmap->idmap_upcall_data, data, NULL) == data)
564		nfs_idmap_complete_pipe_upcall(data, ret);
565}
566
567static int nfs_idmap_legacy_upcall(struct key *authkey, void *aux)
568{
569	struct idmap_legacy_upcalldata *data;
570	struct request_key_auth *rka = get_request_key_auth(authkey);
571	struct rpc_pipe_msg *msg;
572	struct idmap_msg *im;
573	struct idmap *idmap = aux;
574	struct key *key = rka->target_key;
575	int ret = -ENOKEY;
576
577	if (!aux)
578		goto out1;
579
580	/* msg and im are freed in idmap_pipe_destroy_msg */
581	ret = -ENOMEM;
582	data = kzalloc(sizeof(*data), GFP_KERNEL);
583	if (!data)
584		goto out1;
585
586	msg = &data->pipe_msg;
587	im = &data->idmap_msg;
588	data->idmap = idmap;
589	data->authkey = key_get(authkey);
590
591	ret = nfs_idmap_prepare_message(key->description, idmap, im, msg);
592	if (ret < 0)
593		goto out2;
594
595	ret = -EAGAIN;
596	if (!nfs_idmap_prepare_pipe_upcall(idmap, data))
597		goto out2;
598
599	ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
600	if (ret < 0)
601		nfs_idmap_abort_pipe_upcall(idmap, data, ret);
602
603	return ret;
604out2:
605	kfree(data);
606out1:
607	complete_request_key(authkey, ret);
608	return ret;
609}
610
611static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen)
612{
613	return key_instantiate_and_link(key, data, datalen,
614					id_resolver_cache->thread_keyring,
615					authkey);
616}
617
618static int nfs_idmap_read_and_verify_message(struct idmap_msg *im,
619		struct idmap_msg *upcall,
620		struct key *key, struct key *authkey)
621{
622	char id_str[NFS_UINT_MAXLEN];
623	size_t len;
624	int ret = -ENOKEY;
625
626	/* ret = -ENOKEY */
627	if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv)
628		goto out;
629	switch (im->im_conv) {
630	case IDMAP_CONV_NAMETOID:
631		if (strcmp(upcall->im_name, im->im_name) != 0)
632			break;
633		/* Note: here we store the NUL terminator too */
634		len = 1 + nfs_map_numeric_to_string(im->im_id, id_str,
635						    sizeof(id_str));
636		ret = nfs_idmap_instantiate(key, authkey, id_str, len);
637		break;
638	case IDMAP_CONV_IDTONAME:
639		if (upcall->im_id != im->im_id)
640			break;
641		len = strlen(im->im_name);
642		ret = nfs_idmap_instantiate(key, authkey, im->im_name, len);
643		break;
644	default:
645		ret = -EINVAL;
646	}
647out:
648	return ret;
649}
650
651static ssize_t
652idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
653{
654	struct request_key_auth *rka;
655	struct rpc_inode *rpci = RPC_I(file_inode(filp));
656	struct idmap *idmap = (struct idmap *)rpci->private;
657	struct idmap_legacy_upcalldata *data;
658	struct key *authkey;
659	struct idmap_msg im;
660	size_t namelen_in;
661	int ret = -ENOKEY;
662
663	/* If instantiation is successful, anyone waiting for key construction
664	 * will have been woken up and someone else may now have used
665	 * idmap_key_cons - so after this point we may no longer touch it.
666	 */
667	data = xchg(&idmap->idmap_upcall_data, NULL);
668	if (data == NULL)
669		goto out_noupcall;
670
671	authkey = data->authkey;
672	rka = get_request_key_auth(authkey);
673
674	if (mlen != sizeof(im)) {
675		ret = -ENOSPC;
676		goto out;
677	}
678
679	if (copy_from_user(&im, src, mlen) != 0) {
680		ret = -EFAULT;
681		goto out;
682	}
683
684	if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
685		ret = -ENOKEY;
686		goto out;
687	}
688
689	namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
690	if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
691		ret = -EINVAL;
692		goto out;
693	}
694
695	ret = nfs_idmap_read_and_verify_message(&im, &data->idmap_msg,
696						rka->target_key, authkey);
697	if (ret >= 0) {
698		key_set_timeout(rka->target_key, nfs_idmap_cache_timeout);
699		ret = mlen;
700	}
701
702out:
703	nfs_idmap_complete_pipe_upcall(data, ret);
704out_noupcall:
705	return ret;
706}
707
708static void
709idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
710{
711	struct idmap_legacy_upcalldata *data = container_of(msg,
712			struct idmap_legacy_upcalldata,
713			pipe_msg);
714	struct idmap *idmap = data->idmap;
715
716	if (msg->errno)
717		nfs_idmap_abort_pipe_upcall(idmap, data, msg->errno);
718}
719
720static void
721idmap_release_pipe(struct inode *inode)
722{
723	struct rpc_inode *rpci = RPC_I(inode);
724	struct idmap *idmap = (struct idmap *)rpci->private;
725	struct idmap_legacy_upcalldata *data;
726
727	data = xchg(&idmap->idmap_upcall_data, NULL);
728	if (data)
729		nfs_idmap_complete_pipe_upcall(data, -EPIPE);
730}
731
732int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid)
733{
734	struct idmap *idmap = server->nfs_client->cl_idmap;
735	__u32 id = -1;
736	int ret = 0;
737
738	if (!nfs_map_string_to_numeric(name, namelen, &id))
739		ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap);
740	if (ret == 0) {
741		*uid = make_kuid(idmap_userns(idmap), id);
742		if (!uid_valid(*uid))
743			ret = -ERANGE;
744	}
745	trace_nfs4_map_name_to_uid(name, namelen, id, ret);
746	return ret;
747}
748
749int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid)
750{
751	struct idmap *idmap = server->nfs_client->cl_idmap;
752	__u32 id = -1;
753	int ret = 0;
754
755	if (!nfs_map_string_to_numeric(name, namelen, &id))
756		ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap);
757	if (ret == 0) {
758		*gid = make_kgid(idmap_userns(idmap), id);
759		if (!gid_valid(*gid))
760			ret = -ERANGE;
761	}
762	trace_nfs4_map_group_to_gid(name, namelen, id, ret);
763	return ret;
764}
765
766int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen)
767{
768	struct idmap *idmap = server->nfs_client->cl_idmap;
769	int ret = -EINVAL;
770	__u32 id;
771
772	id = from_kuid_munged(idmap_userns(idmap), uid);
773	if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
774		ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap);
775	if (ret < 0)
776		ret = nfs_map_numeric_to_string(id, buf, buflen);
777	trace_nfs4_map_uid_to_name(buf, ret, id, ret);
778	return ret;
779}
780int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen)
781{
782	struct idmap *idmap = server->nfs_client->cl_idmap;
783	int ret = -EINVAL;
784	__u32 id;
785
786	id = from_kgid_munged(idmap_userns(idmap), gid);
787	if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
788		ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap);
789	if (ret < 0)
790		ret = nfs_map_numeric_to_string(id, buf, buflen);
791	trace_nfs4_map_gid_to_group(buf, ret, id, ret);
792	return ret;
793}