blob: 4832fd819f884f4a6b436a70369fea4ea9bfcf93 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/seq_file.h>
Boaz Harrosh341eb182009-12-03 20:29:12 +020037#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090038#include <linux/slab.h>
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +040039#include <linux/sunrpc/svc_xprt.h>
Stanislav Kinsburskyf5c8593b2011-12-07 12:57:56 +030040#include <net/net_namespace.h>
J. Bruce Fields2ca72e12011-01-04 17:37:15 -050041#include "idmap.h"
J. Bruce Fields3c726022011-01-04 17:53:52 -050042#include "nfsd.h"
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +040043#include "netns.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45/*
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -040046 * Turn off idmapping when using AUTH_SYS.
47 */
48static bool nfs4_disable_idmapping = true;
49module_param(nfs4_disable_idmapping, bool, 0644);
50MODULE_PARM_DESC(nfs4_disable_idmapping,
51 "Turn off server's NFSv4 idmapping when using 'sec=sys'");
52
53/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 * 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#define IDMAP_TYPE_USER 0
63#define IDMAP_TYPE_GROUP 1
64
65struct ent {
66 struct cache_head h;
67 int type; /* User / Group */
Eric W. Biedermanb5663892013-02-02 03:54:35 -080068 u32 id;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 char name[IDMAP_NAMESZ];
70 char authname[IDMAP_NAMESZ];
71};
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073/* Common entry handling */
74
75#define ENT_HASHBITS 8
76#define ENT_HASHMAX (1 << ENT_HASHBITS)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
NeilBrownf9ecc922006-03-27 01:15:06 -080078static void
79ent_init(struct cache_head *cnew, struct cache_head *citm)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
NeilBrownf9ecc922006-03-27 01:15:06 -080081 struct ent *new = container_of(cnew, struct ent, h);
82 struct ent *itm = container_of(citm, struct ent, h);
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 new->id = itm->id;
85 new->type = itm->type;
86
87 strlcpy(new->name, itm->name, sizeof(new->name));
88 strlcpy(new->authname, itm->authname, sizeof(new->name));
89}
90
NeilBrownfd39ca92005-06-23 22:04:03 -070091static void
NeilBrownbaab9352006-03-27 01:15:09 -080092ent_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
NeilBrownbaab9352006-03-27 01:15:09 -080094 struct ent *map = container_of(ref, struct ent, h.ref);
95 kfree(map);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
NeilBrownf9ecc922006-03-27 01:15:06 -080098static struct cache_head *
99ent_alloc(void)
100{
101 struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
102 if (e)
103 return &e->h;
104 else
105 return NULL;
106}
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108/*
109 * ID -> Name cache
110 */
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112static uint32_t
113idtoname_hash(struct ent *ent)
114{
115 uint32_t hash;
116
117 hash = hash_str(ent->authname, ENT_HASHBITS);
118 hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
119
120 /* Flip LSB for user/group */
121 if (ent->type == IDMAP_TYPE_GROUP)
122 hash ^= 1;
123
124 return hash;
125}
126
127static void
128idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
129 int *blen)
130{
131 struct ent *ent = container_of(ch, struct ent, h);
132 char idstr[11];
133
134 qword_add(bpp, blen, ent->authname);
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700135 snprintf(idstr, sizeof(idstr), "%u", ent->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
137 qword_add(bpp, blen, idstr);
138
139 (*bpp)[-1] = '\n';
140}
141
NeilBrownf9ecc922006-03-27 01:15:06 -0800142static int
143idtoname_match(struct cache_head *ca, struct cache_head *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
NeilBrownf9ecc922006-03-27 01:15:06 -0800145 struct ent *a = container_of(ca, struct ent, h);
146 struct ent *b = container_of(cb, struct ent, h);
147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 return (a->id == b->id && a->type == b->type &&
149 strcmp(a->authname, b->authname) == 0);
150}
151
152static int
153idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
154{
155 struct ent *ent;
156
157 if (h == NULL) {
158 seq_puts(m, "#domain type id [name]\n");
159 return 0;
160 }
161 ent = container_of(h, struct ent, h);
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700162 seq_printf(m, "%s %s %u", ent->authname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
164 ent->id);
165 if (test_bit(CACHE_VALID, &h->flags))
166 seq_printf(m, " %s", ent->name);
167 seq_printf(m, "\n");
168 return 0;
169}
170
171static void
Trond Myklebust2da8ca22009-08-09 15:14:26 -0400172warn_no_idmapd(struct cache_detail *detail, int has_died)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
174 printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
Trond Myklebust2da8ca22009-08-09 15:14:26 -0400175 has_died ? "died" : "not been started");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177
178
179static int idtoname_parse(struct cache_detail *, char *, int);
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400180static struct ent *idtoname_lookup(struct cache_detail *, struct ent *);
181static struct ent *idtoname_update(struct cache_detail *, struct ent *,
182 struct ent *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400184static struct cache_detail idtoname_cache_template = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700185 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 .hash_size = ENT_HASHMAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 .name = "nfs4.idtoname",
188 .cache_put = ent_put,
Stanislav Kinsbursky73fb8472013-02-04 14:02:45 +0300189 .cache_request = idtoname_request,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 .cache_parse = idtoname_parse,
191 .cache_show = idtoname_show,
192 .warn_no_listener = warn_no_idmapd,
NeilBrownf9ecc922006-03-27 01:15:06 -0800193 .match = idtoname_match,
194 .init = ent_init,
195 .update = ent_init,
196 .alloc = ent_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197};
198
Harvey Harrisona254b242008-02-20 12:49:00 -0800199static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
201{
202 struct ent ent, *res;
203 char *buf1, *bp;
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400204 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 int error = -EINVAL;
206
207 if (buf[buflen - 1] != '\n')
208 return (-EINVAL);
209 buf[buflen - 1]= '\0';
210
211 buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
212 if (buf1 == NULL)
213 return (-ENOMEM);
214
215 memset(&ent, 0, sizeof(ent));
216
217 /* Authentication name */
218 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
219 goto out;
220 memcpy(ent.authname, buf1, sizeof(ent.authname));
221
222 /* Type */
223 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
224 goto out;
225 ent.type = strcmp(buf1, "user") == 0 ?
226 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
227
228 /* ID */
229 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
230 goto out;
231 ent.id = simple_strtoul(buf1, &bp, 10);
232 if (bp == buf1)
233 goto out;
234
235 /* expiry */
236 ent.h.expiry_time = get_expiry(&buf);
237 if (ent.h.expiry_time == 0)
238 goto out;
239
NeilBrownf9ecc922006-03-27 01:15:06 -0800240 error = -ENOMEM;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400241 res = idtoname_lookup(cd, &ent);
NeilBrownf9ecc922006-03-27 01:15:06 -0800242 if (!res)
243 goto out;
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 /* Name */
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400246 error = -EINVAL;
247 len = qword_get(&buf, buf1, PAGE_SIZE);
248 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 goto out;
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400250 if (len == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 set_bit(CACHE_NEGATIVE, &ent.h.flags);
J. Bruce Fieldsd4395e02007-10-26 13:32:50 -0400252 else if (len >= IDMAP_NAMESZ)
253 goto out;
254 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 memcpy(ent.name, buf1, sizeof(ent.name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 error = -ENOMEM;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400257 res = idtoname_update(cd, &ent, res);
NeilBrownf9ecc922006-03-27 01:15:06 -0800258 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 goto out;
260
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400261 cache_put(&res->h, cd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 error = 0;
264out:
265 kfree(buf1);
266
267 return error;
268}
269
NeilBrownf9ecc922006-03-27 01:15:06 -0800270
271static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400272idtoname_lookup(struct cache_detail *cd, struct ent *item)
NeilBrownf9ecc922006-03-27 01:15:06 -0800273{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400274 struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800275 idtoname_hash(item));
276 if (ch)
277 return container_of(ch, struct ent, h);
278 else
279 return NULL;
280}
281
282static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400283idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old)
NeilBrownf9ecc922006-03-27 01:15:06 -0800284{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400285 struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800286 idtoname_hash(new));
287 if (ch)
288 return container_of(ch, struct ent, h);
289 else
290 return NULL;
291}
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294/*
295 * Name -> ID cache
296 */
297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298static inline int
299nametoid_hash(struct ent *ent)
300{
301 return hash_str(ent->name, ENT_HASHBITS);
302}
303
NeilBrownfd39ca92005-06-23 22:04:03 -0700304static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
306 int *blen)
307{
308 struct ent *ent = container_of(ch, struct ent, h);
309
310 qword_add(bpp, blen, ent->authname);
311 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
312 qword_add(bpp, blen, ent->name);
313
314 (*bpp)[-1] = '\n';
315}
316
NeilBrownf9ecc922006-03-27 01:15:06 -0800317static int
318nametoid_match(struct cache_head *ca, struct cache_head *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
NeilBrownf9ecc922006-03-27 01:15:06 -0800320 struct ent *a = container_of(ca, struct ent, h);
321 struct ent *b = container_of(cb, struct ent, h);
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
324 strcmp(a->authname, b->authname) == 0);
325}
326
327static int
328nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
329{
330 struct ent *ent;
331
332 if (h == NULL) {
333 seq_puts(m, "#domain type name [id]\n");
334 return 0;
335 }
336 ent = container_of(h, struct ent, h);
337 seq_printf(m, "%s %s %s", ent->authname,
338 ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
339 ent->name);
340 if (test_bit(CACHE_VALID, &h->flags))
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700341 seq_printf(m, " %u", ent->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 seq_printf(m, "\n");
343 return 0;
344}
345
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400346static struct ent *nametoid_lookup(struct cache_detail *, struct ent *);
347static struct ent *nametoid_update(struct cache_detail *, struct ent *,
348 struct ent *);
NeilBrownfd39ca92005-06-23 22:04:03 -0700349static int nametoid_parse(struct cache_detail *, char *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400351static struct cache_detail nametoid_cache_template = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700352 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 .hash_size = ENT_HASHMAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 .name = "nfs4.nametoid",
355 .cache_put = ent_put,
Stanislav Kinsbursky73fb8472013-02-04 14:02:45 +0300356 .cache_request = nametoid_request,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 .cache_parse = nametoid_parse,
358 .cache_show = nametoid_show,
359 .warn_no_listener = warn_no_idmapd,
NeilBrownf9ecc922006-03-27 01:15:06 -0800360 .match = nametoid_match,
361 .init = ent_init,
362 .update = ent_init,
363 .alloc = ent_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364};
365
NeilBrownfd39ca92005-06-23 22:04:03 -0700366static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
368{
369 struct ent ent, *res;
370 char *buf1;
371 int error = -EINVAL;
372
373 if (buf[buflen - 1] != '\n')
374 return (-EINVAL);
375 buf[buflen - 1]= '\0';
376
377 buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
378 if (buf1 == NULL)
379 return (-ENOMEM);
380
381 memset(&ent, 0, sizeof(ent));
382
383 /* Authentication name */
384 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
385 goto out;
386 memcpy(ent.authname, buf1, sizeof(ent.authname));
387
388 /* Type */
389 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
390 goto out;
391 ent.type = strcmp(buf1, "user") == 0 ?
392 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
393
394 /* Name */
395 error = qword_get(&buf, buf1, PAGE_SIZE);
396 if (error <= 0 || error >= IDMAP_NAMESZ)
397 goto out;
398 memcpy(ent.name, buf1, sizeof(ent.name));
399
400 /* expiry */
401 ent.h.expiry_time = get_expiry(&buf);
402 if (ent.h.expiry_time == 0)
403 goto out;
404
405 /* ID */
406 error = get_int(&buf, &ent.id);
407 if (error == -EINVAL)
408 goto out;
409 if (error == -ENOENT)
410 set_bit(CACHE_NEGATIVE, &ent.h.flags);
411
412 error = -ENOMEM;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400413 res = nametoid_lookup(cd, &ent);
NeilBrownf9ecc922006-03-27 01:15:06 -0800414 if (res == NULL)
415 goto out;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400416 res = nametoid_update(cd, &ent, res);
NeilBrownf9ecc922006-03-27 01:15:06 -0800417 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 goto out;
419
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400420 cache_put(&res->h, cd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 error = 0;
422out:
423 kfree(buf1);
424
425 return (error);
426}
427
NeilBrownf9ecc922006-03-27 01:15:06 -0800428
429static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400430nametoid_lookup(struct cache_detail *cd, struct ent *item)
NeilBrownf9ecc922006-03-27 01:15:06 -0800431{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400432 struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800433 nametoid_hash(item));
434 if (ch)
435 return container_of(ch, struct ent, h);
436 else
437 return NULL;
438}
439
440static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400441nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old)
NeilBrownf9ecc922006-03-27 01:15:06 -0800442{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400443 struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800444 nametoid_hash(new));
445 if (ch)
446 return container_of(ch, struct ent, h);
447 else
448 return NULL;
449}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
451/*
452 * Exported API
453 */
454
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500455int
Stanislav Kinsbursky43ec1a22012-04-11 17:32:44 +0400456nfsd_idmap_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500458 int rv;
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400459 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500460
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400461 nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
462 if (IS_ERR(nn->idtoname_cache))
463 return PTR_ERR(nn->idtoname_cache);
464 rv = cache_register_net(nn->idtoname_cache, net);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500465 if (rv)
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400466 goto destroy_idtoname_cache;
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400467 nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
468 if (IS_ERR(nn->nametoid_cache)) {
Julia Lawall92566e22012-08-25 21:57:04 +0200469 rv = PTR_ERR(nn->nametoid_cache);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400470 goto unregister_idtoname_cache;
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400471 }
472 rv = cache_register_net(nn->nametoid_cache, net);
473 if (rv)
474 goto destroy_nametoid_cache;
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400475 return 0;
476
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400477destroy_nametoid_cache:
478 cache_destroy_net(nn->nametoid_cache, net);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400479unregister_idtoname_cache:
480 cache_unregister_net(nn->idtoname_cache, net);
481destroy_idtoname_cache:
482 cache_destroy_net(nn->idtoname_cache, net);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500483 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484}
485
486void
Stanislav Kinsbursky43ec1a22012-04-11 17:32:44 +0400487nfsd_idmap_shutdown(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400489 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
490
491 cache_unregister_net(nn->idtoname_cache, net);
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400492 cache_unregister_net(nn->nametoid_cache, net);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400493 cache_destroy_net(nn->idtoname_cache, net);
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400494 cache_destroy_net(nn->nametoid_cache, net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495}
496
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497static int
498idmap_lookup(struct svc_rqst *rqstp,
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400499 struct ent *(*lookup_fn)(struct cache_detail *, struct ent *),
500 struct ent *key, struct cache_detail *detail, struct ent **item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 int ret;
503
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400504 *item = lookup_fn(detail, key);
NeilBrown839049a2010-08-12 17:04:06 +1000505 if (!*item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 return -ENOMEM;
NeilBrown839049a2010-08-12 17:04:06 +1000507 retry:
508 ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
509
510 if (ret == -ETIMEDOUT) {
511 struct ent *prev_item = *item;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400512 *item = lookup_fn(detail, key);
NeilBrown839049a2010-08-12 17:04:06 +1000513 if (*item != prev_item)
514 goto retry;
515 cache_put(&(*item)->h, detail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 return ret;
518}
519
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700520static char *
521rqst_authname(struct svc_rqst *rqstp)
522{
523 struct auth_domain *clp;
524
525 clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
526 return clp->name;
527}
528
J. Bruce Fields3c726022011-01-04 17:53:52 -0500529static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800531 u32 *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
533 struct ent *item, key = {
534 .type = type,
535 };
536 int ret;
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +0400537 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 if (namelen + 1 > sizeof(key.name))
J. Bruce Fields3c726022011-01-04 17:53:52 -0500540 return nfserr_badowner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 memcpy(key.name, name, namelen);
542 key.name[namelen] = '\0';
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700543 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400544 ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 if (ret == -ENOENT)
J. Bruce Fields3c726022011-01-04 17:53:52 -0500546 return nfserr_badowner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 if (ret)
J. Bruce Fields3c726022011-01-04 17:53:52 -0500548 return nfserrno(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 *id = item->id;
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400550 cache_put(&item->h, nn->nametoid_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 return 0;
552}
553
554static int
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800555idmap_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
557 struct ent *item, key = {
558 .id = id,
559 .type = type,
560 };
561 int ret;
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +0400562 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700564 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400565 ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 if (ret == -ENOENT)
567 return sprintf(name, "%u", id);
568 if (ret)
569 return ret;
570 ret = strlen(item->name);
571 BUG_ON(ret > IDMAP_NAMESZ);
572 memcpy(name, item->name, ret);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400573 cache_put(&item->h, nn->idtoname_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 return ret;
575}
576
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400577static bool
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800578numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400579{
580 int ret;
581 char buf[11];
582
583 if (namelen + 1 > sizeof(buf))
584 /* too long to represent a 32-bit id: */
585 return false;
586 /* Just to make sure it's null-terminated: */
587 memcpy(buf, name, namelen);
588 buf[namelen] = '\0';
Malahal Naineni9959ba02012-09-09 10:25:47 -0500589 ret = kstrtouint(buf, 10, id);
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400590 return ret == 0;
591}
592
593static __be32
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800594do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400595{
J. Bruce Fieldsd5497fc2012-05-14 22:06:49 -0400596 if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400597 if (numeric_name_to_id(rqstp, type, name, namelen, id))
598 return 0;
599 /*
600 * otherwise, fall through and try idmapping, for
601 * backwards compatibility with clients sending names:
602 */
603 return idmap_name_to_id(rqstp, type, name, namelen, id);
604}
605
606static int
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800607do_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400608{
J. Bruce Fieldsd5497fc2012-05-14 22:06:49 -0400609 if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400610 return sprintf(name, "%u", id);
611 return idmap_id_to_name(rqstp, type, id, name);
612}
613
J. Bruce Fields3c726022011-01-04 17:53:52 -0500614__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800616 kuid_t *uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800618 __be32 status;
619 u32 id = -1;
620 status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
621 *uid = make_kuid(&init_user_ns, id);
622 if (!uid_valid(*uid))
623 status = nfserr_badowner;
624 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626
J. Bruce Fields3c726022011-01-04 17:53:52 -0500627__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800629 kgid_t *gid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800631 __be32 status;
632 u32 id = -1;
633 status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
634 *gid = make_kgid(&init_user_ns, id);
635 if (!gid_valid(*gid))
636 status = nfserr_badowner;
637 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
639
640int
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800641nfsd_map_uid_to_name(struct svc_rqst *rqstp, kuid_t uid, char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800643 u32 id = from_kuid(&init_user_ns, uid);
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400644 return do_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645}
646
647int
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800648nfsd_map_gid_to_name(struct svc_rqst *rqstp, kgid_t gid, char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800650 u32 id = from_kgid(&init_user_ns, gid);
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400651 return do_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652}