blob: e1b3d3d472da70d08f4392b01e206a0224d54767 [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 */
Kinglong Mee13c82e82014-09-02 22:14:31 +0800218 len = qword_get(&buf, buf1, PAGE_SIZE);
219 if (len <= 0 || len >= IDMAP_NAMESZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 goto out;
221 memcpy(ent.authname, buf1, sizeof(ent.authname));
222
223 /* Type */
224 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
225 goto out;
226 ent.type = strcmp(buf1, "user") == 0 ?
227 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
228
229 /* ID */
230 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
231 goto out;
232 ent.id = simple_strtoul(buf1, &bp, 10);
233 if (bp == buf1)
234 goto out;
235
236 /* expiry */
237 ent.h.expiry_time = get_expiry(&buf);
238 if (ent.h.expiry_time == 0)
239 goto out;
240
NeilBrownf9ecc922006-03-27 01:15:06 -0800241 error = -ENOMEM;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400242 res = idtoname_lookup(cd, &ent);
NeilBrownf9ecc922006-03-27 01:15:06 -0800243 if (!res)
244 goto out;
245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 /* Name */
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400247 error = -EINVAL;
248 len = qword_get(&buf, buf1, PAGE_SIZE);
Kinglong Mee13c82e82014-09-02 22:14:31 +0800249 if (len < 0 || len >= IDMAP_NAMESZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 goto out;
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400251 if (len == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 set_bit(CACHE_NEGATIVE, &ent.h.flags);
J. Bruce Fieldsd4395e02007-10-26 13:32:50 -0400253 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 memcpy(ent.name, buf1, sizeof(ent.name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 error = -ENOMEM;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400256 res = idtoname_update(cd, &ent, res);
NeilBrownf9ecc922006-03-27 01:15:06 -0800257 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 goto out;
259
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400260 cache_put(&res->h, cd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 error = 0;
262out:
263 kfree(buf1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 return error;
265}
266
NeilBrownf9ecc922006-03-27 01:15:06 -0800267static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400268idtoname_lookup(struct cache_detail *cd, struct ent *item)
NeilBrownf9ecc922006-03-27 01:15:06 -0800269{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400270 struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800271 idtoname_hash(item));
272 if (ch)
273 return container_of(ch, struct ent, h);
274 else
275 return NULL;
276}
277
278static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400279idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old)
NeilBrownf9ecc922006-03-27 01:15:06 -0800280{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400281 struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800282 idtoname_hash(new));
283 if (ch)
284 return container_of(ch, struct ent, h);
285 else
286 return NULL;
287}
288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290/*
291 * Name -> ID cache
292 */
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294static inline int
295nametoid_hash(struct ent *ent)
296{
297 return hash_str(ent->name, ENT_HASHBITS);
298}
299
NeilBrownfd39ca92005-06-23 22:04:03 -0700300static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
302 int *blen)
303{
304 struct ent *ent = container_of(ch, struct ent, h);
305
306 qword_add(bpp, blen, ent->authname);
307 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
308 qword_add(bpp, blen, ent->name);
309
310 (*bpp)[-1] = '\n';
311}
312
NeilBrownf9ecc922006-03-27 01:15:06 -0800313static int
314nametoid_match(struct cache_head *ca, struct cache_head *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315{
NeilBrownf9ecc922006-03-27 01:15:06 -0800316 struct ent *a = container_of(ca, struct ent, h);
317 struct ent *b = container_of(cb, struct ent, h);
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
320 strcmp(a->authname, b->authname) == 0);
321}
322
323static int
324nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
325{
326 struct ent *ent;
327
328 if (h == NULL) {
329 seq_puts(m, "#domain type name [id]\n");
330 return 0;
331 }
332 ent = container_of(h, struct ent, h);
333 seq_printf(m, "%s %s %s", ent->authname,
334 ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
335 ent->name);
336 if (test_bit(CACHE_VALID, &h->flags))
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700337 seq_printf(m, " %u", ent->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 seq_printf(m, "\n");
339 return 0;
340}
341
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400342static struct ent *nametoid_lookup(struct cache_detail *, struct ent *);
343static struct ent *nametoid_update(struct cache_detail *, struct ent *,
344 struct ent *);
NeilBrownfd39ca92005-06-23 22:04:03 -0700345static int nametoid_parse(struct cache_detail *, char *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400347static struct cache_detail nametoid_cache_template = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700348 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 .hash_size = ENT_HASHMAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 .name = "nfs4.nametoid",
351 .cache_put = ent_put,
Stanislav Kinsbursky73fb8472013-02-04 14:02:45 +0300352 .cache_request = nametoid_request,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 .cache_parse = nametoid_parse,
354 .cache_show = nametoid_show,
355 .warn_no_listener = warn_no_idmapd,
NeilBrownf9ecc922006-03-27 01:15:06 -0800356 .match = nametoid_match,
357 .init = ent_init,
358 .update = ent_init,
359 .alloc = ent_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360};
361
NeilBrownfd39ca92005-06-23 22:04:03 -0700362static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
364{
365 struct ent ent, *res;
366 char *buf1;
Kinglong Mee48c348b2014-09-02 22:13:32 +0800367 int len, error = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369 if (buf[buflen - 1] != '\n')
370 return (-EINVAL);
371 buf[buflen - 1]= '\0';
372
373 buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
374 if (buf1 == NULL)
375 return (-ENOMEM);
376
377 memset(&ent, 0, sizeof(ent));
378
379 /* Authentication name */
Kinglong Mee13c82e82014-09-02 22:14:31 +0800380 len = qword_get(&buf, buf1, PAGE_SIZE);
381 if (len <= 0 || len >= IDMAP_NAMESZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 goto out;
383 memcpy(ent.authname, buf1, sizeof(ent.authname));
384
385 /* Type */
386 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
387 goto out;
388 ent.type = strcmp(buf1, "user") == 0 ?
389 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
390
391 /* Name */
Kinglong Mee48c348b2014-09-02 22:13:32 +0800392 len = qword_get(&buf, buf1, PAGE_SIZE);
393 if (len <= 0 || len >= IDMAP_NAMESZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 goto out;
395 memcpy(ent.name, buf1, sizeof(ent.name));
396
397 /* expiry */
398 ent.h.expiry_time = get_expiry(&buf);
399 if (ent.h.expiry_time == 0)
400 goto out;
401
402 /* ID */
403 error = get_int(&buf, &ent.id);
404 if (error == -EINVAL)
405 goto out;
406 if (error == -ENOENT)
407 set_bit(CACHE_NEGATIVE, &ent.h.flags);
408
409 error = -ENOMEM;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400410 res = nametoid_lookup(cd, &ent);
NeilBrownf9ecc922006-03-27 01:15:06 -0800411 if (res == NULL)
412 goto out;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400413 res = nametoid_update(cd, &ent, res);
NeilBrownf9ecc922006-03-27 01:15:06 -0800414 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 goto out;
416
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400417 cache_put(&res->h, cd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 error = 0;
419out:
420 kfree(buf1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 return (error);
422}
423
NeilBrownf9ecc922006-03-27 01:15:06 -0800424
425static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400426nametoid_lookup(struct cache_detail *cd, struct ent *item)
NeilBrownf9ecc922006-03-27 01:15:06 -0800427{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400428 struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800429 nametoid_hash(item));
430 if (ch)
431 return container_of(ch, struct ent, h);
432 else
433 return NULL;
434}
435
436static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400437nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old)
NeilBrownf9ecc922006-03-27 01:15:06 -0800438{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400439 struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800440 nametoid_hash(new));
441 if (ch)
442 return container_of(ch, struct ent, h);
443 else
444 return NULL;
445}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
447/*
448 * Exported API
449 */
450
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500451int
Stanislav Kinsbursky43ec1a22012-04-11 17:32:44 +0400452nfsd_idmap_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500454 int rv;
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400455 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500456
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400457 nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
458 if (IS_ERR(nn->idtoname_cache))
459 return PTR_ERR(nn->idtoname_cache);
460 rv = cache_register_net(nn->idtoname_cache, net);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500461 if (rv)
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400462 goto destroy_idtoname_cache;
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400463 nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
464 if (IS_ERR(nn->nametoid_cache)) {
Julia Lawall92566e22012-08-25 21:57:04 +0200465 rv = PTR_ERR(nn->nametoid_cache);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400466 goto unregister_idtoname_cache;
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400467 }
468 rv = cache_register_net(nn->nametoid_cache, net);
469 if (rv)
470 goto destroy_nametoid_cache;
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400471 return 0;
472
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400473destroy_nametoid_cache:
474 cache_destroy_net(nn->nametoid_cache, net);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400475unregister_idtoname_cache:
476 cache_unregister_net(nn->idtoname_cache, net);
477destroy_idtoname_cache:
478 cache_destroy_net(nn->idtoname_cache, net);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500479 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
482void
Stanislav Kinsbursky43ec1a22012-04-11 17:32:44 +0400483nfsd_idmap_shutdown(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484{
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400485 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
486
487 cache_unregister_net(nn->idtoname_cache, net);
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400488 cache_unregister_net(nn->nametoid_cache, net);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400489 cache_destroy_net(nn->idtoname_cache, net);
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400490 cache_destroy_net(nn->nametoid_cache, net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491}
492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493static int
494idmap_lookup(struct svc_rqst *rqstp,
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400495 struct ent *(*lookup_fn)(struct cache_detail *, struct ent *),
496 struct ent *key, struct cache_detail *detail, struct ent **item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 int ret;
499
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400500 *item = lookup_fn(detail, key);
NeilBrown839049a2010-08-12 17:04:06 +1000501 if (!*item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 return -ENOMEM;
NeilBrown839049a2010-08-12 17:04:06 +1000503 retry:
504 ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
505
506 if (ret == -ETIMEDOUT) {
507 struct ent *prev_item = *item;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400508 *item = lookup_fn(detail, key);
NeilBrown839049a2010-08-12 17:04:06 +1000509 if (*item != prev_item)
510 goto retry;
511 cache_put(&(*item)->h, detail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 return ret;
514}
515
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700516static char *
517rqst_authname(struct svc_rqst *rqstp)
518{
519 struct auth_domain *clp;
520
521 clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
522 return clp->name;
523}
524
J. Bruce Fields3c726022011-01-04 17:53:52 -0500525static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800527 u32 *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
529 struct ent *item, key = {
530 .type = type,
531 };
532 int ret;
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +0400533 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 if (namelen + 1 > sizeof(key.name))
J. Bruce Fields3c726022011-01-04 17:53:52 -0500536 return nfserr_badowner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 memcpy(key.name, name, namelen);
538 key.name[namelen] = '\0';
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700539 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400540 ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 if (ret == -ENOENT)
J. Bruce Fields3c726022011-01-04 17:53:52 -0500542 return nfserr_badowner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 if (ret)
J. Bruce Fields3c726022011-01-04 17:53:52 -0500544 return nfserrno(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 *id = item->id;
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400546 cache_put(&item->h, nn->nametoid_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 return 0;
548}
549
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400550static __be32 encode_ascii_id(struct xdr_stream *xdr, u32 id)
J. Bruce Fields35541162014-01-08 09:49:01 -0500551{
552 char buf[11];
553 int len;
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400554 __be32 *p;
J. Bruce Fields35541162014-01-08 09:49:01 -0500555
556 len = sprintf(buf, "%u", id);
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400557 p = xdr_reserve_space(xdr, len + 4);
558 if (!p)
J. Bruce Fields35541162014-01-08 09:49:01 -0500559 return nfserr_resource;
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400560 p = xdr_encode_opaque(p, buf, len);
J. Bruce Fields35541162014-01-08 09:49:01 -0500561 return 0;
562}
563
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400564static __be32 idmap_id_to_name(struct xdr_stream *xdr,
565 struct svc_rqst *rqstp, int type, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
567 struct ent *item, key = {
568 .id = id,
569 .type = type,
570 };
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400571 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 int ret;
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +0400573 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700575 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400576 ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 if (ret == -ENOENT)
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400578 return encode_ascii_id(xdr, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 if (ret)
J. Bruce Fields35541162014-01-08 09:49:01 -0500580 return nfserrno(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 ret = strlen(item->name);
J. Bruce Fields35541162014-01-08 09:49:01 -0500582 WARN_ON_ONCE(ret > IDMAP_NAMESZ);
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400583 p = xdr_reserve_space(xdr, ret + 4);
584 if (!p)
J. Bruce Fields35541162014-01-08 09:49:01 -0500585 return nfserr_resource;
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400586 p = xdr_encode_opaque(p, item->name, ret);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400587 cache_put(&item->h, nn->idtoname_cache);
J. Bruce Fields35541162014-01-08 09:49:01 -0500588 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589}
590
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400591static bool
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800592numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400593{
594 int ret;
595 char buf[11];
596
597 if (namelen + 1 > sizeof(buf))
598 /* too long to represent a 32-bit id: */
599 return false;
600 /* Just to make sure it's null-terminated: */
601 memcpy(buf, name, namelen);
602 buf[namelen] = '\0';
Malahal Naineni9959ba02012-09-09 10:25:47 -0500603 ret = kstrtouint(buf, 10, id);
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400604 return ret == 0;
605}
606
607static __be32
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800608do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400609{
J. Bruce Fieldsd5497fc2012-05-14 22:06:49 -0400610 if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400611 if (numeric_name_to_id(rqstp, type, name, namelen, id))
612 return 0;
613 /*
614 * otherwise, fall through and try idmapping, for
615 * backwards compatibility with clients sending names:
616 */
617 return idmap_name_to_id(rqstp, type, name, namelen, id);
618}
619
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400620static __be32 encode_name_from_id(struct xdr_stream *xdr,
621 struct svc_rqst *rqstp, int type, u32 id)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400622{
J. Bruce Fieldsd5497fc2012-05-14 22:06:49 -0400623 if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400624 return encode_ascii_id(xdr, id);
625 return idmap_id_to_name(xdr, rqstp, type, id);
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400626}
627
J. Bruce Fields3c726022011-01-04 17:53:52 -0500628__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800630 kuid_t *uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800632 __be32 status;
633 u32 id = -1;
634 status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
635 *uid = make_kuid(&init_user_ns, id);
636 if (!uid_valid(*uid))
637 status = nfserr_badowner;
638 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639}
640
J. Bruce Fields3c726022011-01-04 17:53:52 -0500641__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800643 kgid_t *gid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800645 __be32 status;
646 u32 id = -1;
647 status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
648 *gid = make_kgid(&init_user_ns, id);
649 if (!gid_valid(*gid))
650 status = nfserr_badowner;
651 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652}
653
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400654__be32 nfsd4_encode_user(struct xdr_stream *xdr, struct svc_rqst *rqstp,
655 kuid_t uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800657 u32 id = from_kuid(&init_user_ns, uid);
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400658 return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659}
660
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400661__be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp,
662 kgid_t gid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800664 u32 id = from_kgid(&init_user_ns, gid);
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400665 return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666}