blob: a5bb76593ce72c280ddbd8e5957beddea49ec413 [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070062struct ent {
63 struct cache_head h;
64 int type; /* User / Group */
Eric W. Biedermanb5663892013-02-02 03:54:35 -080065 u32 id;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 char name[IDMAP_NAMESZ];
67 char authname[IDMAP_NAMESZ];
68};
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070/* Common entry handling */
71
72#define ENT_HASHBITS 8
73#define ENT_HASHMAX (1 << ENT_HASHBITS)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
NeilBrownf9ecc922006-03-27 01:15:06 -080075static void
76ent_init(struct cache_head *cnew, struct cache_head *citm)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
NeilBrownf9ecc922006-03-27 01:15:06 -080078 struct ent *new = container_of(cnew, struct ent, h);
79 struct ent *itm = container_of(citm, struct ent, h);
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 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
NeilBrownfd39ca92005-06-23 22:04:03 -070088static void
NeilBrownbaab9352006-03-27 01:15:09 -080089ent_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
NeilBrownbaab9352006-03-27 01:15:09 -080091 struct ent *map = container_of(ref, struct ent, h.ref);
92 kfree(map);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
NeilBrownf9ecc922006-03-27 01:15:06 -080095static struct cache_head *
96ent_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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105/*
106 * ID -> Name cache
107 */
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109static uint32_t
110idtoname_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
124static void
125idtoname_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);
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700132 snprintf(idstr, sizeof(idstr), "%u", ent->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
134 qword_add(bpp, blen, idstr);
135
136 (*bpp)[-1] = '\n';
137}
138
NeilBrownf9ecc922006-03-27 01:15:06 -0800139static int
140idtoname_match(struct cache_head *ca, struct cache_head *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
NeilBrownf9ecc922006-03-27 01:15:06 -0800142 struct ent *a = container_of(ca, struct ent, h);
143 struct ent *b = container_of(cb, struct ent, h);
144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 return (a->id == b->id && a->type == b->type &&
146 strcmp(a->authname, b->authname) == 0);
147}
148
149static int
150idtoname_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);
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700159 seq_printf(m, "%s %s %u", ent->authname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 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
168static void
Trond Myklebust2da8ca22009-08-09 15:14:26 -0400169warn_no_idmapd(struct cache_detail *detail, int has_died)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
171 printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
Trond Myklebust2da8ca22009-08-09 15:14:26 -0400172 has_died ? "died" : "not been started");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
174
175
176static int idtoname_parse(struct cache_detail *, char *, int);
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400177static struct ent *idtoname_lookup(struct cache_detail *, struct ent *);
178static struct ent *idtoname_update(struct cache_detail *, struct ent *,
179 struct ent *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Bhumika Goyalae2e4082017-10-17 18:14:25 +0200181static const struct cache_detail idtoname_cache_template = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700182 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 .hash_size = ENT_HASHMAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 .name = "nfs4.idtoname",
185 .cache_put = ent_put,
Stanislav Kinsbursky73fb8472013-02-04 14:02:45 +0300186 .cache_request = idtoname_request,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 .cache_parse = idtoname_parse,
188 .cache_show = idtoname_show,
189 .warn_no_listener = warn_no_idmapd,
NeilBrownf9ecc922006-03-27 01:15:06 -0800190 .match = idtoname_match,
191 .init = ent_init,
192 .update = ent_init,
193 .alloc = ent_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194};
195
Harvey Harrisona254b242008-02-20 12:49:00 -0800196static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
198{
199 struct ent ent, *res;
200 char *buf1, *bp;
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400201 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 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 */
Kinglong Mee13c82e82014-09-02 22:14:31 +0800215 len = qword_get(&buf, buf1, PAGE_SIZE);
216 if (len <= 0 || len >= IDMAP_NAMESZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 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
NeilBrownf9ecc922006-03-27 01:15:06 -0800238 error = -ENOMEM;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400239 res = idtoname_lookup(cd, &ent);
NeilBrownf9ecc922006-03-27 01:15:06 -0800240 if (!res)
241 goto out;
242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 /* Name */
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400244 error = -EINVAL;
245 len = qword_get(&buf, buf1, PAGE_SIZE);
Kinglong Mee13c82e82014-09-02 22:14:31 +0800246 if (len < 0 || len >= IDMAP_NAMESZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 goto out;
J. Bruce Fieldsc9b6cbe2007-07-27 16:36:45 -0400248 if (len == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 set_bit(CACHE_NEGATIVE, &ent.h.flags);
J. Bruce Fieldsd4395e02007-10-26 13:32:50 -0400250 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 memcpy(ent.name, buf1, sizeof(ent.name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 error = -ENOMEM;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400253 res = idtoname_update(cd, &ent, res);
NeilBrownf9ecc922006-03-27 01:15:06 -0800254 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 goto out;
256
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400257 cache_put(&res->h, cd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 error = 0;
259out:
260 kfree(buf1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 return error;
262}
263
NeilBrownf9ecc922006-03-27 01:15:06 -0800264static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400265idtoname_lookup(struct cache_detail *cd, struct ent *item)
NeilBrownf9ecc922006-03-27 01:15:06 -0800266{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400267 struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800268 idtoname_hash(item));
269 if (ch)
270 return container_of(ch, struct ent, h);
271 else
272 return NULL;
273}
274
275static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400276idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old)
NeilBrownf9ecc922006-03-27 01:15:06 -0800277{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400278 struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800279 idtoname_hash(new));
280 if (ch)
281 return container_of(ch, struct ent, h);
282 else
283 return NULL;
284}
285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287/*
288 * Name -> ID cache
289 */
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291static inline int
292nametoid_hash(struct ent *ent)
293{
294 return hash_str(ent->name, ENT_HASHBITS);
295}
296
NeilBrownfd39ca92005-06-23 22:04:03 -0700297static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298nametoid_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
NeilBrownf9ecc922006-03-27 01:15:06 -0800310static int
311nametoid_match(struct cache_head *ca, struct cache_head *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
NeilBrownf9ecc922006-03-27 01:15:06 -0800313 struct ent *a = container_of(ca, struct ent, h);
314 struct ent *b = container_of(cb, struct ent, h);
315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
317 strcmp(a->authname, b->authname) == 0);
318}
319
320static int
321nametoid_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))
J. Bruce Fields0a725fc2007-07-31 00:37:52 -0700334 seq_printf(m, " %u", ent->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 seq_printf(m, "\n");
336 return 0;
337}
338
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400339static struct ent *nametoid_lookup(struct cache_detail *, struct ent *);
340static struct ent *nametoid_update(struct cache_detail *, struct ent *,
341 struct ent *);
NeilBrownfd39ca92005-06-23 22:04:03 -0700342static int nametoid_parse(struct cache_detail *, char *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Bhumika Goyalae2e4082017-10-17 18:14:25 +0200344static const struct cache_detail nametoid_cache_template = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700345 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 .hash_size = ENT_HASHMAX,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 .name = "nfs4.nametoid",
348 .cache_put = ent_put,
Stanislav Kinsbursky73fb8472013-02-04 14:02:45 +0300349 .cache_request = nametoid_request,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 .cache_parse = nametoid_parse,
351 .cache_show = nametoid_show,
352 .warn_no_listener = warn_no_idmapd,
NeilBrownf9ecc922006-03-27 01:15:06 -0800353 .match = nametoid_match,
354 .init = ent_init,
355 .update = ent_init,
356 .alloc = ent_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357};
358
NeilBrownfd39ca92005-06-23 22:04:03 -0700359static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
361{
362 struct ent ent, *res;
363 char *buf1;
Kinglong Mee48c348b2014-09-02 22:13:32 +0800364 int len, error = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
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 */
Kinglong Mee13c82e82014-09-02 22:14:31 +0800377 len = qword_get(&buf, buf1, PAGE_SIZE);
378 if (len <= 0 || len >= IDMAP_NAMESZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 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 */
Kinglong Mee48c348b2014-09-02 22:13:32 +0800389 len = qword_get(&buf, buf1, PAGE_SIZE);
390 if (len <= 0 || len >= IDMAP_NAMESZ)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 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;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400407 res = nametoid_lookup(cd, &ent);
NeilBrownf9ecc922006-03-27 01:15:06 -0800408 if (res == NULL)
409 goto out;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400410 res = nametoid_update(cd, &ent, res);
NeilBrownf9ecc922006-03-27 01:15:06 -0800411 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 goto out;
413
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400414 cache_put(&res->h, cd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 error = 0;
416out:
417 kfree(buf1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 return (error);
419}
420
NeilBrownf9ecc922006-03-27 01:15:06 -0800421
422static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400423nametoid_lookup(struct cache_detail *cd, struct ent *item)
NeilBrownf9ecc922006-03-27 01:15:06 -0800424{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400425 struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800426 nametoid_hash(item));
427 if (ch)
428 return container_of(ch, struct ent, h);
429 else
430 return NULL;
431}
432
433static struct ent *
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400434nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old)
NeilBrownf9ecc922006-03-27 01:15:06 -0800435{
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400436 struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
NeilBrownf9ecc922006-03-27 01:15:06 -0800437 nametoid_hash(new));
438 if (ch)
439 return container_of(ch, struct ent, h);
440 else
441 return NULL;
442}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
444/*
445 * Exported API
446 */
447
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500448int
Stanislav Kinsbursky43ec1a22012-04-11 17:32:44 +0400449nfsd_idmap_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500451 int rv;
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400452 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500453
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400454 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);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500458 if (rv)
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400459 goto destroy_idtoname_cache;
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400460 nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
461 if (IS_ERR(nn->nametoid_cache)) {
Julia Lawall92566e22012-08-25 21:57:04 +0200462 rv = PTR_ERR(nn->nametoid_cache);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400463 goto unregister_idtoname_cache;
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400464 }
465 rv = cache_register_net(nn->nametoid_cache, net);
466 if (rv)
467 goto destroy_nametoid_cache;
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400468 return 0;
469
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400470destroy_nametoid_cache:
471 cache_destroy_net(nn->nametoid_cache, net);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400472unregister_idtoname_cache:
473 cache_unregister_net(nn->idtoname_cache, net);
474destroy_idtoname_cache:
475 cache_destroy_net(nn->idtoname_cache, net);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -0500476 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477}
478
479void
Stanislav Kinsbursky43ec1a22012-04-11 17:32:44 +0400480nfsd_idmap_shutdown(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400482 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
483
484 cache_unregister_net(nn->idtoname_cache, net);
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400485 cache_unregister_net(nn->nametoid_cache, net);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400486 cache_destroy_net(nn->idtoname_cache, net);
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400487 cache_destroy_net(nn->nametoid_cache, net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488}
489
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490static int
491idmap_lookup(struct svc_rqst *rqstp,
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400492 struct ent *(*lookup_fn)(struct cache_detail *, struct ent *),
493 struct ent *key, struct cache_detail *detail, struct ent **item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 int ret;
496
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400497 *item = lookup_fn(detail, key);
NeilBrown839049a2010-08-12 17:04:06 +1000498 if (!*item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 return -ENOMEM;
NeilBrown839049a2010-08-12 17:04:06 +1000500 retry:
501 ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
502
503 if (ret == -ETIMEDOUT) {
504 struct ent *prev_item = *item;
Stanislav Kinsburskyf890edb2012-03-29 19:34:16 +0400505 *item = lookup_fn(detail, key);
NeilBrown839049a2010-08-12 17:04:06 +1000506 if (*item != prev_item)
507 goto retry;
508 cache_put(&(*item)->h, detail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 return ret;
511}
512
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700513static char *
514rqst_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
J. Bruce Fields3c726022011-01-04 17:53:52 -0500522static __be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800524 u32 *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525{
526 struct ent *item, key = {
527 .type = type,
528 };
529 int ret;
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +0400530 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532 if (namelen + 1 > sizeof(key.name))
J. Bruce Fields3c726022011-01-04 17:53:52 -0500533 return nfserr_badowner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 memcpy(key.name, name, namelen);
535 key.name[namelen] = '\0';
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700536 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400537 ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 if (ret == -ENOENT)
J. Bruce Fields3c726022011-01-04 17:53:52 -0500539 return nfserr_badowner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (ret)
J. Bruce Fields3c726022011-01-04 17:53:52 -0500541 return nfserrno(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 *id = item->id;
Stanislav Kinsbursky9e75a4d2012-04-11 17:32:58 +0400543 cache_put(&item->h, nn->nametoid_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 return 0;
545}
546
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400547static __be32 encode_ascii_id(struct xdr_stream *xdr, u32 id)
J. Bruce Fields35541162014-01-08 09:49:01 -0500548{
549 char buf[11];
550 int len;
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400551 __be32 *p;
J. Bruce Fields35541162014-01-08 09:49:01 -0500552
553 len = sprintf(buf, "%u", id);
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400554 p = xdr_reserve_space(xdr, len + 4);
555 if (!p)
J. Bruce Fields35541162014-01-08 09:49:01 -0500556 return nfserr_resource;
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400557 p = xdr_encode_opaque(p, buf, len);
J. Bruce Fields35541162014-01-08 09:49:01 -0500558 return 0;
559}
560
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400561static __be32 idmap_id_to_name(struct xdr_stream *xdr,
562 struct svc_rqst *rqstp, int type, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
564 struct ent *item, key = {
565 .id = id,
566 .type = type,
567 };
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400568 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 int ret;
Stanislav Kinsbursky9695c702012-07-25 16:57:06 +0400570 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700572 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400573 ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 if (ret == -ENOENT)
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400575 return encode_ascii_id(xdr, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 if (ret)
J. Bruce Fields35541162014-01-08 09:49:01 -0500577 return nfserrno(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 ret = strlen(item->name);
J. Bruce Fields35541162014-01-08 09:49:01 -0500579 WARN_ON_ONCE(ret > IDMAP_NAMESZ);
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400580 p = xdr_reserve_space(xdr, ret + 4);
581 if (!p)
J. Bruce Fields35541162014-01-08 09:49:01 -0500582 return nfserr_resource;
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400583 p = xdr_encode_opaque(p, item->name, ret);
Stanislav Kinsburskyc2e76ef2012-04-11 17:32:51 +0400584 cache_put(&item->h, nn->idtoname_cache);
J. Bruce Fields35541162014-01-08 09:49:01 -0500585 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586}
587
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400588static bool
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800589numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400590{
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';
Malahal Naineni9959ba02012-09-09 10:25:47 -0500600 ret = kstrtouint(buf, 10, id);
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400601 return ret == 0;
602}
603
604static __be32
Eric W. Biedermanb5663892013-02-02 03:54:35 -0800605do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400606{
J. Bruce Fieldsd5497fc2012-05-14 22:06:49 -0400607 if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400608 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
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400617static __be32 encode_name_from_id(struct xdr_stream *xdr,
618 struct svc_rqst *rqstp, int type, u32 id)
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400619{
J. Bruce Fieldsd5497fc2012-05-14 22:06:49 -0400620 if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400621 return encode_ascii_id(xdr, id);
622 return idmap_id_to_name(xdr, rqstp, type, id);
J. Bruce Fieldse9541ce2012-03-22 16:07:18 -0400623}
624
J. Bruce Fields3c726022011-01-04 17:53:52 -0500625__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800627 kuid_t *uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800629 __be32 status;
630 u32 id = -1;
Kinglong Meec3821b32017-02-05 22:02:01 +0800631
632 if (name == NULL || namelen == 0)
633 return nfserr_inval;
634
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800635 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640}
641
J. Bruce Fields3c726022011-01-04 17:53:52 -0500642__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800644 kgid_t *gid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800646 __be32 status;
647 u32 id = -1;
Kinglong Meec3821b32017-02-05 22:02:01 +0800648
649 if (name == NULL || namelen == 0)
650 return nfserr_inval;
651
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800652 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657}
658
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400659__be32 nfsd4_encode_user(struct xdr_stream *xdr, struct svc_rqst *rqstp,
660 kuid_t uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800662 u32 id = from_kuid(&init_user_ns, uid);
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400663 return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664}
665
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400666__be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp,
667 kgid_t gid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668{
Eric W. Biederman65e10f62013-02-02 03:24:21 -0800669 u32 id = from_kgid(&init_user_ns, gid);
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400670 return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671}