1 /*
2  *  Mapping of UID/GIDs to name and vice versa.
3  *
4  *  Copyright (c) 2002, 2003 The Regents of the University of
5  *  Michigan.  All rights reserved.
6  *
7  *  Marius Aamodt Eriksen <marius@umich.edu>
8  *
9  *  Redistribution and use in source and binary forms, with or without
10  *  modification, are permitted provided that the following conditions
11  *  are met:
12  *
13  *  1. Redistributions of source code must retain the above copyright
14  *     notice, this list of conditions and the following disclaimer.
15  *  2. Redistributions in binary form must reproduce the above copyright
16  *     notice, this list of conditions and the following disclaimer in the
17  *     documentation and/or other materials provided with the distribution.
18  *  3. Neither the name of the University nor the names of its
19  *     contributors may be used to endorse or promote products derived
20  *     from this software without specific prior written permission.
21  *
22  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33  */
34 
35 #include <linux/module.h>
36 #include <linux/seq_file.h>
37 #include <linux/sched.h>
38 #include <linux/slab.h>
39 #include <linux/sunrpc/svc_xprt.h>
40 #include <net/net_namespace.h>
41 #include "idmap.h"
42 #include "nfsd.h"
43 #include "netns.h"
44 
45 /*
46  * Turn off idmapping when using AUTH_SYS.
47  */
48 static bool nfs4_disable_idmapping = true;
49 module_param(nfs4_disable_idmapping, bool, 0644);
50 MODULE_PARM_DESC(nfs4_disable_idmapping,
51 		"Turn off server's NFSv4 idmapping when using 'sec=sys'");
52 
53 /*
54  * Cache entry
55  */
56 
57 /*
58  * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
59  * that.
60  */
61 
62 struct ent {
63 	struct cache_head h;
64 	int               type;		       /* User / Group */
65 	u32               id;
66 	char              name[IDMAP_NAMESZ];
67 	char              authname[IDMAP_NAMESZ];
68 };
69 
70 /* Common entry handling */
71 
72 #define ENT_HASHBITS          8
73 #define ENT_HASHMAX           (1 << ENT_HASHBITS)
74 
75 static void
ent_init(struct cache_head * cnew,struct cache_head * citm)76 ent_init(struct cache_head *cnew, struct cache_head *citm)
77 {
78 	struct ent *new = container_of(cnew, struct ent, h);
79 	struct ent *itm = container_of(citm, struct ent, h);
80 
81 	new->id = itm->id;
82 	new->type = itm->type;
83 
84 	strlcpy(new->name, itm->name, sizeof(new->name));
85 	strlcpy(new->authname, itm->authname, sizeof(new->name));
86 }
87 
88 static void
ent_put(struct kref * ref)89 ent_put(struct kref *ref)
90 {
91 	struct ent *map = container_of(ref, struct ent, h.ref);
92 	kfree(map);
93 }
94 
95 static struct cache_head *
ent_alloc(void)96 ent_alloc(void)
97 {
98 	struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
99 	if (e)
100 		return &e->h;
101 	else
102 		return NULL;
103 }
104 
105 /*
106  * ID -> Name cache
107  */
108 
109 static uint32_t
idtoname_hash(struct ent * ent)110 idtoname_hash(struct ent *ent)
111 {
112 	uint32_t hash;
113 
114 	hash = hash_str(ent->authname, ENT_HASHBITS);
115 	hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
116 
117 	/* Flip LSB for user/group */
118 	if (ent->type == IDMAP_TYPE_GROUP)
119 		hash ^= 1;
120 
121 	return hash;
122 }
123 
124 static void
idtoname_request(struct cache_detail * cd,struct cache_head * ch,char ** bpp,int * blen)125 idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
126     int *blen)
127 {
128  	struct ent *ent = container_of(ch, struct ent, h);
129 	char idstr[11];
130 
131 	qword_add(bpp, blen, ent->authname);
132 	snprintf(idstr, sizeof(idstr), "%u", ent->id);
133 	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
134 	qword_add(bpp, blen, idstr);
135 
136 	(*bpp)[-1] = '\n';
137 }
138 
139 static int
idtoname_match(struct cache_head * ca,struct cache_head * cb)140 idtoname_match(struct cache_head *ca, struct cache_head *cb)
141 {
142 	struct ent *a = container_of(ca, struct ent, h);
143 	struct ent *b = container_of(cb, struct ent, h);
144 
145 	return (a->id == b->id && a->type == b->type &&
146 	    strcmp(a->authname, b->authname) == 0);
147 }
148 
149 static int
idtoname_show(struct seq_file * m,struct cache_detail * cd,struct cache_head * h)150 idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
151 {
152 	struct ent *ent;
153 
154 	if (h == NULL) {
155 		seq_puts(m, "#domain type id [name]\n");
156 		return 0;
157 	}
158 	ent = container_of(h, struct ent, h);
159 	seq_printf(m, "%s %s %u", ent->authname,
160 			ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
161 			ent->id);
162 	if (test_bit(CACHE_VALID, &h->flags))
163 		seq_printf(m, " %s", ent->name);
164 	seq_printf(m, "\n");
165 	return 0;
166 }
167 
168 static void
warn_no_idmapd(struct cache_detail * detail,int has_died)169 warn_no_idmapd(struct cache_detail *detail, int has_died)
170 {
171 	printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
172 			has_died ? "died" : "not been started");
173 }
174 
175 
176 static int         idtoname_parse(struct cache_detail *, char *, int);
177 static struct ent *idtoname_lookup(struct cache_detail *, struct ent *);
178 static struct ent *idtoname_update(struct cache_detail *, struct ent *,
179 				   struct ent *);
180 
181 static const struct cache_detail idtoname_cache_template = {
182 	.owner		= THIS_MODULE,
183 	.hash_size	= ENT_HASHMAX,
184 	.name		= "nfs4.idtoname",
185 	.cache_put	= ent_put,
186 	.cache_request	= idtoname_request,
187 	.cache_parse	= idtoname_parse,
188 	.cache_show	= idtoname_show,
189 	.warn_no_listener = warn_no_idmapd,
190 	.match		= idtoname_match,
191 	.init		= ent_init,
192 	.update		= ent_init,
193 	.alloc		= ent_alloc,
194 };
195 
196 static int
idtoname_parse(struct cache_detail * cd,char * buf,int buflen)197 idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
198 {
199 	struct ent ent, *res;
200 	char *buf1, *bp;
201 	int len;
202 	int error = -EINVAL;
203 
204 	if (buf[buflen - 1] != '\n')
205 		return (-EINVAL);
206 	buf[buflen - 1]= '\0';
207 
208 	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
209 	if (buf1 == NULL)
210 		return (-ENOMEM);
211 
212 	memset(&ent, 0, sizeof(ent));
213 
214 	/* Authentication name */
215 	len = qword_get(&buf, buf1, PAGE_SIZE);
216 	if (len <= 0 || len >= IDMAP_NAMESZ)
217 		goto out;
218 	memcpy(ent.authname, buf1, sizeof(ent.authname));
219 
220 	/* Type */
221 	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
222 		goto out;
223 	ent.type = strcmp(buf1, "user") == 0 ?
224 		IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
225 
226 	/* ID */
227 	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
228 		goto out;
229 	ent.id = simple_strtoul(buf1, &bp, 10);
230 	if (bp == buf1)
231 		goto out;
232 
233 	/* expiry */
234 	ent.h.expiry_time = get_expiry(&buf);
235 	if (ent.h.expiry_time == 0)
236 		goto out;
237 
238 	error = -ENOMEM;
239 	res = idtoname_lookup(cd, &ent);
240 	if (!res)
241 		goto out;
242 
243 	/* Name */
244 	error = -EINVAL;
245 	len = qword_get(&buf, buf1, PAGE_SIZE);
246 	if (len < 0 || len >= IDMAP_NAMESZ)
247 		goto out;
248 	if (len == 0)
249 		set_bit(CACHE_NEGATIVE, &ent.h.flags);
250 	else
251 		memcpy(ent.name, buf1, sizeof(ent.name));
252 	error = -ENOMEM;
253 	res = idtoname_update(cd, &ent, res);
254 	if (res == NULL)
255 		goto out;
256 
257 	cache_put(&res->h, cd);
258 	error = 0;
259 out:
260 	kfree(buf1);
261 	return error;
262 }
263 
264 static struct ent *
idtoname_lookup(struct cache_detail * cd,struct ent * item)265 idtoname_lookup(struct cache_detail *cd, struct ent *item)
266 {
267 	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
268 						    idtoname_hash(item));
269 	if (ch)
270 		return container_of(ch, struct ent, h);
271 	else
272 		return NULL;
273 }
274 
275 static struct ent *
idtoname_update(struct cache_detail * cd,struct ent * new,struct ent * old)276 idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old)
277 {
278 	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
279 						    idtoname_hash(new));
280 	if (ch)
281 		return container_of(ch, struct ent, h);
282 	else
283 		return NULL;
284 }
285 
286 
287 /*
288  * Name -> ID cache
289  */
290 
291 static inline int
nametoid_hash(struct ent * ent)292 nametoid_hash(struct ent *ent)
293 {
294 	return hash_str(ent->name, ENT_HASHBITS);
295 }
296 
297 static void
nametoid_request(struct cache_detail * cd,struct cache_head * ch,char ** bpp,int * blen)298 nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
299     int *blen)
300 {
301  	struct ent *ent = container_of(ch, struct ent, h);
302 
303 	qword_add(bpp, blen, ent->authname);
304 	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
305 	qword_add(bpp, blen, ent->name);
306 
307 	(*bpp)[-1] = '\n';
308 }
309 
310 static int
nametoid_match(struct cache_head * ca,struct cache_head * cb)311 nametoid_match(struct cache_head *ca, struct cache_head *cb)
312 {
313 	struct ent *a = container_of(ca, struct ent, h);
314 	struct ent *b = container_of(cb, struct ent, h);
315 
316 	return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
317 	    strcmp(a->authname, b->authname) == 0);
318 }
319 
320 static int
nametoid_show(struct seq_file * m,struct cache_detail * cd,struct cache_head * h)321 nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
322 {
323 	struct ent *ent;
324 
325 	if (h == NULL) {
326 		seq_puts(m, "#domain type name [id]\n");
327 		return 0;
328 	}
329 	ent = container_of(h, struct ent, h);
330 	seq_printf(m, "%s %s %s", ent->authname,
331 			ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
332 			ent->name);
333 	if (test_bit(CACHE_VALID, &h->flags))
334 		seq_printf(m, " %u", ent->id);
335 	seq_printf(m, "\n");
336 	return 0;
337 }
338 
339 static struct ent *nametoid_lookup(struct cache_detail *, struct ent *);
340 static struct ent *nametoid_update(struct cache_detail *, struct ent *,
341 				   struct ent *);
342 static int         nametoid_parse(struct cache_detail *, char *, int);
343 
344 static const struct cache_detail nametoid_cache_template = {
345 	.owner		= THIS_MODULE,
346 	.hash_size	= ENT_HASHMAX,
347 	.name		= "nfs4.nametoid",
348 	.cache_put	= ent_put,
349 	.cache_request	= nametoid_request,
350 	.cache_parse	= nametoid_parse,
351 	.cache_show	= nametoid_show,
352 	.warn_no_listener = warn_no_idmapd,
353 	.match		= nametoid_match,
354 	.init		= ent_init,
355 	.update		= ent_init,
356 	.alloc		= ent_alloc,
357 };
358 
359 static int
nametoid_parse(struct cache_detail * cd,char * buf,int buflen)360 nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
361 {
362 	struct ent ent, *res;
363 	char *buf1;
364 	int len, error = -EINVAL;
365 
366 	if (buf[buflen - 1] != '\n')
367 		return (-EINVAL);
368 	buf[buflen - 1]= '\0';
369 
370 	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
371 	if (buf1 == NULL)
372 		return (-ENOMEM);
373 
374 	memset(&ent, 0, sizeof(ent));
375 
376 	/* Authentication name */
377 	len = qword_get(&buf, buf1, PAGE_SIZE);
378 	if (len <= 0 || len >= IDMAP_NAMESZ)
379 		goto out;
380 	memcpy(ent.authname, buf1, sizeof(ent.authname));
381 
382 	/* Type */
383 	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
384 		goto out;
385 	ent.type = strcmp(buf1, "user") == 0 ?
386 		IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
387 
388 	/* Name */
389 	len = qword_get(&buf, buf1, PAGE_SIZE);
390 	if (len <= 0 || len >= IDMAP_NAMESZ)
391 		goto out;
392 	memcpy(ent.name, buf1, sizeof(ent.name));
393 
394 	/* expiry */
395 	ent.h.expiry_time = get_expiry(&buf);
396 	if (ent.h.expiry_time == 0)
397 		goto out;
398 
399 	/* ID */
400 	error = get_int(&buf, &ent.id);
401 	if (error == -EINVAL)
402 		goto out;
403 	if (error == -ENOENT)
404 		set_bit(CACHE_NEGATIVE, &ent.h.flags);
405 
406 	error = -ENOMEM;
407 	res = nametoid_lookup(cd, &ent);
408 	if (res == NULL)
409 		goto out;
410 	res = nametoid_update(cd, &ent, res);
411 	if (res == NULL)
412 		goto out;
413 
414 	cache_put(&res->h, cd);
415 	error = 0;
416 out:
417 	kfree(buf1);
418 	return (error);
419 }
420 
421 
422 static struct ent *
nametoid_lookup(struct cache_detail * cd,struct ent * item)423 nametoid_lookup(struct cache_detail *cd, struct ent *item)
424 {
425 	struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
426 						    nametoid_hash(item));
427 	if (ch)
428 		return container_of(ch, struct ent, h);
429 	else
430 		return NULL;
431 }
432 
433 static struct ent *
nametoid_update(struct cache_detail * cd,struct ent * new,struct ent * old)434 nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old)
435 {
436 	struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
437 						    nametoid_hash(new));
438 	if (ch)
439 		return container_of(ch, struct ent, h);
440 	else
441 		return NULL;
442 }
443 
444 /*
445  * Exported API
446  */
447 
448 int
nfsd_idmap_init(struct net * net)449 nfsd_idmap_init(struct net *net)
450 {
451 	int rv;
452 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
453 
454 	nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
455 	if (IS_ERR(nn->idtoname_cache))
456 		return PTR_ERR(nn->idtoname_cache);
457 	rv = cache_register_net(nn->idtoname_cache, net);
458 	if (rv)
459 		goto destroy_idtoname_cache;
460 	nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
461 	if (IS_ERR(nn->nametoid_cache)) {
462 		rv = PTR_ERR(nn->nametoid_cache);
463 		goto unregister_idtoname_cache;
464 	}
465 	rv = cache_register_net(nn->nametoid_cache, net);
466 	if (rv)
467 		goto destroy_nametoid_cache;
468 	return 0;
469 
470 destroy_nametoid_cache:
471 	cache_destroy_net(nn->nametoid_cache, net);
472 unregister_idtoname_cache:
473 	cache_unregister_net(nn->idtoname_cache, net);
474 destroy_idtoname_cache:
475 	cache_destroy_net(nn->idtoname_cache, net);
476 	return rv;
477 }
478 
479 void
nfsd_idmap_shutdown(struct net * net)480 nfsd_idmap_shutdown(struct net *net)
481 {
482 	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
483 
484 	cache_unregister_net(nn->idtoname_cache, net);
485 	cache_unregister_net(nn->nametoid_cache, net);
486 	cache_destroy_net(nn->idtoname_cache, net);
487 	cache_destroy_net(nn->nametoid_cache, net);
488 }
489 
490 static int
idmap_lookup(struct svc_rqst * rqstp,struct ent * (* lookup_fn)(struct cache_detail *,struct ent *),struct ent * key,struct cache_detail * detail,struct ent ** item)491 idmap_lookup(struct svc_rqst *rqstp,
492 		struct ent *(*lookup_fn)(struct cache_detail *, struct ent *),
493 		struct ent *key, struct cache_detail *detail, struct ent **item)
494 {
495 	int ret;
496 
497 	*item = lookup_fn(detail, key);
498 	if (!*item)
499 		return -ENOMEM;
500  retry:
501 	ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
502 
503 	if (ret == -ETIMEDOUT) {
504 		struct ent *prev_item = *item;
505 		*item = lookup_fn(detail, key);
506 		if (*item != prev_item)
507 			goto retry;
508 		cache_put(&(*item)->h, detail);
509 	}
510 	return ret;
511 }
512 
513 static char *
rqst_authname(struct svc_rqst * rqstp)514 rqst_authname(struct svc_rqst *rqstp)
515 {
516 	struct auth_domain *clp;
517 
518 	clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
519 	return clp->name;
520 }
521 
522 static __be32
idmap_name_to_id(struct svc_rqst * rqstp,int type,const char * name,u32 namelen,u32 * id)523 idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
524 		u32 *id)
525 {
526 	struct ent *item, key = {
527 		.type = type,
528 	};
529 	int ret;
530 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
531 
532 	if (namelen + 1 > sizeof(key.name))
533 		return nfserr_badowner;
534 	memcpy(key.name, name, namelen);
535 	key.name[namelen] = '\0';
536 	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
537 	ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
538 	if (ret == -ENOENT)
539 		return nfserr_badowner;
540 	if (ret)
541 		return nfserrno(ret);
542 	*id = item->id;
543 	cache_put(&item->h, nn->nametoid_cache);
544 	return 0;
545 }
546 
encode_ascii_id(struct xdr_stream * xdr,u32 id)547 static __be32 encode_ascii_id(struct xdr_stream *xdr, u32 id)
548 {
549 	char buf[11];
550 	int len;
551 	__be32 *p;
552 
553 	len = sprintf(buf, "%u", id);
554 	p = xdr_reserve_space(xdr, len + 4);
555 	if (!p)
556 		return nfserr_resource;
557 	p = xdr_encode_opaque(p, buf, len);
558 	return 0;
559 }
560 
idmap_id_to_name(struct xdr_stream * xdr,struct svc_rqst * rqstp,int type,u32 id)561 static __be32 idmap_id_to_name(struct xdr_stream *xdr,
562 			       struct svc_rqst *rqstp, int type, u32 id)
563 {
564 	struct ent *item, key = {
565 		.id = id,
566 		.type = type,
567 	};
568 	__be32 *p;
569 	int ret;
570 	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
571 
572 	strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
573 	ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
574 	if (ret == -ENOENT)
575 		return encode_ascii_id(xdr, id);
576 	if (ret)
577 		return nfserrno(ret);
578 	ret = strlen(item->name);
579 	WARN_ON_ONCE(ret > IDMAP_NAMESZ);
580 	p = xdr_reserve_space(xdr, ret + 4);
581 	if (!p)
582 		return nfserr_resource;
583 	p = xdr_encode_opaque(p, item->name, ret);
584 	cache_put(&item->h, nn->idtoname_cache);
585 	return 0;
586 }
587 
588 static bool
numeric_name_to_id(struct svc_rqst * rqstp,int type,const char * name,u32 namelen,u32 * id)589 numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
590 {
591 	int ret;
592 	char buf[11];
593 
594 	if (namelen + 1 > sizeof(buf))
595 		/* too long to represent a 32-bit id: */
596 		return false;
597 	/* Just to make sure it's null-terminated: */
598 	memcpy(buf, name, namelen);
599 	buf[namelen] = '\0';
600 	ret = kstrtouint(buf, 10, id);
601 	return ret == 0;
602 }
603 
604 static __be32
do_name_to_id(struct svc_rqst * rqstp,int type,const char * name,u32 namelen,u32 * id)605 do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
606 {
607 	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
608 		if (numeric_name_to_id(rqstp, type, name, namelen, id))
609 			return 0;
610 		/*
611 		 * otherwise, fall through and try idmapping, for
612 		 * backwards compatibility with clients sending names:
613 		 */
614 	return idmap_name_to_id(rqstp, type, name, namelen, id);
615 }
616 
encode_name_from_id(struct xdr_stream * xdr,struct svc_rqst * rqstp,int type,u32 id)617 static __be32 encode_name_from_id(struct xdr_stream *xdr,
618 				  struct svc_rqst *rqstp, int type, u32 id)
619 {
620 	if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
621 		return encode_ascii_id(xdr, id);
622 	return idmap_id_to_name(xdr, rqstp, type, id);
623 }
624 
625 __be32
nfsd_map_name_to_uid(struct svc_rqst * rqstp,const char * name,size_t namelen,kuid_t * uid)626 nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
627 		kuid_t *uid)
628 {
629 	__be32 status;
630 	u32 id = -1;
631 
632 	if (name == NULL || namelen == 0)
633 		return nfserr_inval;
634 
635 	status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
636 	*uid = make_kuid(&init_user_ns, id);
637 	if (!uid_valid(*uid))
638 		status = nfserr_badowner;
639 	return status;
640 }
641 
642 __be32
nfsd_map_name_to_gid(struct svc_rqst * rqstp,const char * name,size_t namelen,kgid_t * gid)643 nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
644 		kgid_t *gid)
645 {
646 	__be32 status;
647 	u32 id = -1;
648 
649 	if (name == NULL || namelen == 0)
650 		return nfserr_inval;
651 
652 	status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
653 	*gid = make_kgid(&init_user_ns, id);
654 	if (!gid_valid(*gid))
655 		status = nfserr_badowner;
656 	return status;
657 }
658 
nfsd4_encode_user(struct xdr_stream * xdr,struct svc_rqst * rqstp,kuid_t uid)659 __be32 nfsd4_encode_user(struct xdr_stream *xdr, struct svc_rqst *rqstp,
660 			 kuid_t uid)
661 {
662 	u32 id = from_kuid(&init_user_ns, uid);
663 	return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id);
664 }
665 
nfsd4_encode_group(struct xdr_stream * xdr,struct svc_rqst * rqstp,kgid_t gid)666 __be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp,
667 			  kgid_t gid)
668 {
669 	u32 id = from_kgid(&init_user_ns, gid);
670 	return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id);
671 }
672