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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
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 | ||
1da177e4 | 35 | #include <linux/module.h> |
1da177e4 | 36 | #include <linux/seq_file.h> |
341eb184 | 37 | #include <linux/sched.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
c2e76ef5 | 39 | #include <linux/sunrpc/svc_xprt.h> |
f5c8593b | 40 | #include <net/net_namespace.h> |
2ca72e17 | 41 | #include "idmap.h" |
3c726023 | 42 | #include "nfsd.h" |
c2e76ef5 | 43 | #include "netns.h" |
1da177e4 | 44 | |
e9541ce8 BF |
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 | ||
1da177e4 LT |
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 | ||
1da177e4 LT |
62 | struct ent { |
63 | struct cache_head h; | |
64 | int type; /* User / Group */ | |
b5663898 | 65 | u32 id; |
1da177e4 LT |
66 | char name[IDMAP_NAMESZ]; |
67 | char authname[IDMAP_NAMESZ]; | |
9d5afd94 | 68 | struct rcu_head rcu_head; |
1da177e4 LT |
69 | }; |
70 | ||
1da177e4 LT |
71 | /* Common entry handling */ |
72 | ||
73 | #define ENT_HASHBITS 8 | |
74 | #define ENT_HASHMAX (1 << ENT_HASHBITS) | |
1da177e4 | 75 | |
f9ecc921 N |
76 | static void |
77 | ent_init(struct cache_head *cnew, struct cache_head *citm) | |
1da177e4 | 78 | { |
f9ecc921 N |
79 | struct ent *new = container_of(cnew, struct ent, h); |
80 | struct ent *itm = container_of(citm, struct ent, h); | |
81 | ||
1da177e4 LT |
82 | new->id = itm->id; |
83 | new->type = itm->type; | |
84 | ||
85 | strlcpy(new->name, itm->name, sizeof(new->name)); | |
86 | strlcpy(new->authname, itm->authname, sizeof(new->name)); | |
87 | } | |
88 | ||
fd39ca9a | 89 | static void |
baab935f | 90 | ent_put(struct kref *ref) |
1da177e4 | 91 | { |
baab935f | 92 | struct ent *map = container_of(ref, struct ent, h.ref); |
9d5afd94 | 93 | kfree_rcu(map, rcu_head); |
1da177e4 LT |
94 | } |
95 | ||
f9ecc921 N |
96 | static struct cache_head * |
97 | ent_alloc(void) | |
98 | { | |
99 | struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL); | |
100 | if (e) | |
101 | return &e->h; | |
102 | else | |
103 | return NULL; | |
104 | } | |
105 | ||
1da177e4 LT |
106 | /* |
107 | * ID -> Name cache | |
108 | */ | |
109 | ||
1da177e4 LT |
110 | static uint32_t |
111 | idtoname_hash(struct ent *ent) | |
112 | { | |
113 | uint32_t hash; | |
114 | ||
115 | hash = hash_str(ent->authname, ENT_HASHBITS); | |
116 | hash = hash_long(hash ^ ent->id, ENT_HASHBITS); | |
117 | ||
118 | /* Flip LSB for user/group */ | |
119 | if (ent->type == IDMAP_TYPE_GROUP) | |
120 | hash ^= 1; | |
121 | ||
122 | return hash; | |
123 | } | |
124 | ||
125 | static void | |
126 | idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, | |
127 | int *blen) | |
128 | { | |
129 | struct ent *ent = container_of(ch, struct ent, h); | |
130 | char idstr[11]; | |
131 | ||
132 | qword_add(bpp, blen, ent->authname); | |
0a725fc4 | 133 | snprintf(idstr, sizeof(idstr), "%u", ent->id); |
1da177e4 LT |
134 | qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); |
135 | qword_add(bpp, blen, idstr); | |
136 | ||
137 | (*bpp)[-1] = '\n'; | |
138 | } | |
139 | ||
f9ecc921 N |
140 | static int |
141 | idtoname_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 142 | { |
f9ecc921 N |
143 | struct ent *a = container_of(ca, struct ent, h); |
144 | struct ent *b = container_of(cb, struct ent, h); | |
145 | ||
1da177e4 LT |
146 | return (a->id == b->id && a->type == b->type && |
147 | strcmp(a->authname, b->authname) == 0); | |
148 | } | |
149 | ||
150 | static int | |
151 | idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) | |
152 | { | |
153 | struct ent *ent; | |
154 | ||
155 | if (h == NULL) { | |
156 | seq_puts(m, "#domain type id [name]\n"); | |
157 | return 0; | |
158 | } | |
159 | ent = container_of(h, struct ent, h); | |
0a725fc4 | 160 | seq_printf(m, "%s %s %u", ent->authname, |
1da177e4 LT |
161 | ent->type == IDMAP_TYPE_GROUP ? "group" : "user", |
162 | ent->id); | |
163 | if (test_bit(CACHE_VALID, &h->flags)) | |
164 | seq_printf(m, " %s", ent->name); | |
165 | seq_printf(m, "\n"); | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static void | |
2da8ca26 | 170 | warn_no_idmapd(struct cache_detail *detail, int has_died) |
1da177e4 LT |
171 | { |
172 | printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n", | |
2da8ca26 | 173 | has_died ? "died" : "not been started"); |
1da177e4 LT |
174 | } |
175 | ||
176 | ||
177 | static int idtoname_parse(struct cache_detail *, char *, int); | |
f890edbb SK |
178 | static struct ent *idtoname_lookup(struct cache_detail *, struct ent *); |
179 | static struct ent *idtoname_update(struct cache_detail *, struct ent *, | |
180 | struct ent *); | |
1da177e4 | 181 | |
ae2e408e | 182 | static const struct cache_detail idtoname_cache_template = { |
f35279d3 | 183 | .owner = THIS_MODULE, |
1da177e4 | 184 | .hash_size = ENT_HASHMAX, |
1da177e4 LT |
185 | .name = "nfs4.idtoname", |
186 | .cache_put = ent_put, | |
73fb847a | 187 | .cache_request = idtoname_request, |
1da177e4 LT |
188 | .cache_parse = idtoname_parse, |
189 | .cache_show = idtoname_show, | |
190 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
191 | .match = idtoname_match, |
192 | .init = ent_init, | |
193 | .update = ent_init, | |
194 | .alloc = ent_alloc, | |
1da177e4 LT |
195 | }; |
196 | ||
a254b246 | 197 | static int |
1da177e4 LT |
198 | idtoname_parse(struct cache_detail *cd, char *buf, int buflen) |
199 | { | |
200 | struct ent ent, *res; | |
201 | char *buf1, *bp; | |
c9b6cbe5 | 202 | int len; |
1da177e4 LT |
203 | int error = -EINVAL; |
204 | ||
205 | if (buf[buflen - 1] != '\n') | |
206 | return (-EINVAL); | |
207 | buf[buflen - 1]= '\0'; | |
208 | ||
209 | buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
210 | if (buf1 == NULL) | |
211 | return (-ENOMEM); | |
212 | ||
213 | memset(&ent, 0, sizeof(ent)); | |
214 | ||
215 | /* Authentication name */ | |
13c82e8e KM |
216 | len = qword_get(&buf, buf1, PAGE_SIZE); |
217 | if (len <= 0 || len >= IDMAP_NAMESZ) | |
1da177e4 LT |
218 | goto out; |
219 | memcpy(ent.authname, buf1, sizeof(ent.authname)); | |
220 | ||
221 | /* Type */ | |
222 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
223 | goto out; | |
224 | ent.type = strcmp(buf1, "user") == 0 ? | |
225 | IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; | |
226 | ||
227 | /* ID */ | |
228 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
229 | goto out; | |
230 | ent.id = simple_strtoul(buf1, &bp, 10); | |
231 | if (bp == buf1) | |
232 | goto out; | |
233 | ||
234 | /* expiry */ | |
235 | ent.h.expiry_time = get_expiry(&buf); | |
236 | if (ent.h.expiry_time == 0) | |
237 | goto out; | |
238 | ||
f9ecc921 | 239 | error = -ENOMEM; |
f890edbb | 240 | res = idtoname_lookup(cd, &ent); |
f9ecc921 N |
241 | if (!res) |
242 | goto out; | |
243 | ||
1da177e4 | 244 | /* Name */ |
c9b6cbe5 BF |
245 | error = -EINVAL; |
246 | len = qword_get(&buf, buf1, PAGE_SIZE); | |
13c82e8e | 247 | if (len < 0 || len >= IDMAP_NAMESZ) |
1da177e4 | 248 | goto out; |
c9b6cbe5 | 249 | if (len == 0) |
1da177e4 | 250 | set_bit(CACHE_NEGATIVE, &ent.h.flags); |
d4395e03 | 251 | else |
1da177e4 | 252 | memcpy(ent.name, buf1, sizeof(ent.name)); |
1da177e4 | 253 | error = -ENOMEM; |
f890edbb | 254 | res = idtoname_update(cd, &ent, res); |
f9ecc921 | 255 | if (res == NULL) |
1da177e4 LT |
256 | goto out; |
257 | ||
f890edbb | 258 | cache_put(&res->h, cd); |
1da177e4 LT |
259 | error = 0; |
260 | out: | |
261 | kfree(buf1); | |
1da177e4 LT |
262 | return error; |
263 | } | |
264 | ||
f9ecc921 | 265 | static struct ent * |
f890edbb | 266 | idtoname_lookup(struct cache_detail *cd, struct ent *item) |
f9ecc921 | 267 | { |
9d5afd94 TM |
268 | struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h, |
269 | idtoname_hash(item)); | |
f9ecc921 N |
270 | if (ch) |
271 | return container_of(ch, struct ent, h); | |
272 | else | |
273 | return NULL; | |
274 | } | |
275 | ||
276 | static struct ent * | |
f890edbb | 277 | idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old) |
f9ecc921 | 278 | { |
f890edbb | 279 | struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h, |
f9ecc921 N |
280 | idtoname_hash(new)); |
281 | if (ch) | |
282 | return container_of(ch, struct ent, h); | |
283 | else | |
284 | return NULL; | |
285 | } | |
286 | ||
1da177e4 LT |
287 | |
288 | /* | |
289 | * Name -> ID cache | |
290 | */ | |
291 | ||
1da177e4 LT |
292 | static inline int |
293 | nametoid_hash(struct ent *ent) | |
294 | { | |
295 | return hash_str(ent->name, ENT_HASHBITS); | |
296 | } | |
297 | ||
fd39ca9a | 298 | static void |
1da177e4 LT |
299 | nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, |
300 | int *blen) | |
301 | { | |
302 | struct ent *ent = container_of(ch, struct ent, h); | |
303 | ||
304 | qword_add(bpp, blen, ent->authname); | |
305 | qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); | |
306 | qword_add(bpp, blen, ent->name); | |
307 | ||
308 | (*bpp)[-1] = '\n'; | |
309 | } | |
310 | ||
f9ecc921 N |
311 | static int |
312 | nametoid_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 313 | { |
f9ecc921 N |
314 | struct ent *a = container_of(ca, struct ent, h); |
315 | struct ent *b = container_of(cb, struct ent, h); | |
316 | ||
1da177e4 LT |
317 | return (a->type == b->type && strcmp(a->name, b->name) == 0 && |
318 | strcmp(a->authname, b->authname) == 0); | |
319 | } | |
320 | ||
321 | static int | |
322 | nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) | |
323 | { | |
324 | struct ent *ent; | |
325 | ||
326 | if (h == NULL) { | |
327 | seq_puts(m, "#domain type name [id]\n"); | |
328 | return 0; | |
329 | } | |
330 | ent = container_of(h, struct ent, h); | |
331 | seq_printf(m, "%s %s %s", ent->authname, | |
332 | ent->type == IDMAP_TYPE_GROUP ? "group" : "user", | |
333 | ent->name); | |
334 | if (test_bit(CACHE_VALID, &h->flags)) | |
0a725fc4 | 335 | seq_printf(m, " %u", ent->id); |
1da177e4 LT |
336 | seq_printf(m, "\n"); |
337 | return 0; | |
338 | } | |
339 | ||
f890edbb SK |
340 | static struct ent *nametoid_lookup(struct cache_detail *, struct ent *); |
341 | static struct ent *nametoid_update(struct cache_detail *, struct ent *, | |
342 | struct ent *); | |
fd39ca9a | 343 | static int nametoid_parse(struct cache_detail *, char *, int); |
1da177e4 | 344 | |
ae2e408e | 345 | static const struct cache_detail nametoid_cache_template = { |
f35279d3 | 346 | .owner = THIS_MODULE, |
1da177e4 | 347 | .hash_size = ENT_HASHMAX, |
1da177e4 LT |
348 | .name = "nfs4.nametoid", |
349 | .cache_put = ent_put, | |
73fb847a | 350 | .cache_request = nametoid_request, |
1da177e4 LT |
351 | .cache_parse = nametoid_parse, |
352 | .cache_show = nametoid_show, | |
353 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
354 | .match = nametoid_match, |
355 | .init = ent_init, | |
356 | .update = ent_init, | |
357 | .alloc = ent_alloc, | |
1da177e4 LT |
358 | }; |
359 | ||
fd39ca9a | 360 | static int |
1da177e4 LT |
361 | nametoid_parse(struct cache_detail *cd, char *buf, int buflen) |
362 | { | |
363 | struct ent ent, *res; | |
364 | char *buf1; | |
48c348b0 | 365 | int len, error = -EINVAL; |
1da177e4 LT |
366 | |
367 | if (buf[buflen - 1] != '\n') | |
368 | return (-EINVAL); | |
369 | buf[buflen - 1]= '\0'; | |
370 | ||
371 | buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
372 | if (buf1 == NULL) | |
373 | return (-ENOMEM); | |
374 | ||
375 | memset(&ent, 0, sizeof(ent)); | |
376 | ||
377 | /* Authentication name */ | |
13c82e8e KM |
378 | len = qword_get(&buf, buf1, PAGE_SIZE); |
379 | if (len <= 0 || len >= IDMAP_NAMESZ) | |
1da177e4 LT |
380 | goto out; |
381 | memcpy(ent.authname, buf1, sizeof(ent.authname)); | |
382 | ||
383 | /* Type */ | |
384 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
385 | goto out; | |
386 | ent.type = strcmp(buf1, "user") == 0 ? | |
387 | IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; | |
388 | ||
389 | /* Name */ | |
48c348b0 KM |
390 | len = qword_get(&buf, buf1, PAGE_SIZE); |
391 | if (len <= 0 || len >= IDMAP_NAMESZ) | |
1da177e4 LT |
392 | goto out; |
393 | memcpy(ent.name, buf1, sizeof(ent.name)); | |
394 | ||
395 | /* expiry */ | |
396 | ent.h.expiry_time = get_expiry(&buf); | |
397 | if (ent.h.expiry_time == 0) | |
398 | goto out; | |
399 | ||
400 | /* ID */ | |
401 | error = get_int(&buf, &ent.id); | |
402 | if (error == -EINVAL) | |
403 | goto out; | |
404 | if (error == -ENOENT) | |
405 | set_bit(CACHE_NEGATIVE, &ent.h.flags); | |
406 | ||
407 | error = -ENOMEM; | |
f890edbb | 408 | res = nametoid_lookup(cd, &ent); |
f9ecc921 N |
409 | if (res == NULL) |
410 | goto out; | |
f890edbb | 411 | res = nametoid_update(cd, &ent, res); |
f9ecc921 | 412 | if (res == NULL) |
1da177e4 LT |
413 | goto out; |
414 | ||
f890edbb | 415 | cache_put(&res->h, cd); |
1da177e4 LT |
416 | error = 0; |
417 | out: | |
418 | kfree(buf1); | |
1da177e4 LT |
419 | return (error); |
420 | } | |
421 | ||
f9ecc921 N |
422 | |
423 | static struct ent * | |
f890edbb | 424 | nametoid_lookup(struct cache_detail *cd, struct ent *item) |
f9ecc921 | 425 | { |
9d5afd94 TM |
426 | struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h, |
427 | nametoid_hash(item)); | |
f9ecc921 N |
428 | if (ch) |
429 | return container_of(ch, struct ent, h); | |
430 | else | |
431 | return NULL; | |
432 | } | |
433 | ||
434 | static struct ent * | |
f890edbb | 435 | nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old) |
f9ecc921 | 436 | { |
f890edbb | 437 | struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h, |
f9ecc921 N |
438 | nametoid_hash(new)); |
439 | if (ch) | |
440 | return container_of(ch, struct ent, h); | |
441 | else | |
442 | return NULL; | |
443 | } | |
1da177e4 LT |
444 | |
445 | /* | |
446 | * Exported API | |
447 | */ | |
448 | ||
dbf847ec | 449 | int |
43ec1a20 | 450 | nfsd_idmap_init(struct net *net) |
1da177e4 | 451 | { |
dbf847ec | 452 | int rv; |
c2e76ef5 | 453 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
dbf847ec | 454 | |
c2e76ef5 SK |
455 | nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net); |
456 | if (IS_ERR(nn->idtoname_cache)) | |
457 | return PTR_ERR(nn->idtoname_cache); | |
458 | rv = cache_register_net(nn->idtoname_cache, net); | |
dbf847ec | 459 | if (rv) |
c2e76ef5 | 460 | goto destroy_idtoname_cache; |
9e75a4de SK |
461 | nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net); |
462 | if (IS_ERR(nn->nametoid_cache)) { | |
92566e28 | 463 | rv = PTR_ERR(nn->nametoid_cache); |
c2e76ef5 | 464 | goto unregister_idtoname_cache; |
9e75a4de SK |
465 | } |
466 | rv = cache_register_net(nn->nametoid_cache, net); | |
467 | if (rv) | |
468 | goto destroy_nametoid_cache; | |
c2e76ef5 SK |
469 | return 0; |
470 | ||
9e75a4de SK |
471 | destroy_nametoid_cache: |
472 | cache_destroy_net(nn->nametoid_cache, net); | |
c2e76ef5 SK |
473 | unregister_idtoname_cache: |
474 | cache_unregister_net(nn->idtoname_cache, net); | |
475 | destroy_idtoname_cache: | |
476 | cache_destroy_net(nn->idtoname_cache, net); | |
dbf847ec | 477 | return rv; |
1da177e4 LT |
478 | } |
479 | ||
480 | void | |
43ec1a20 | 481 | nfsd_idmap_shutdown(struct net *net) |
1da177e4 | 482 | { |
c2e76ef5 SK |
483 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
484 | ||
485 | cache_unregister_net(nn->idtoname_cache, net); | |
9e75a4de | 486 | cache_unregister_net(nn->nametoid_cache, net); |
c2e76ef5 | 487 | cache_destroy_net(nn->idtoname_cache, net); |
9e75a4de | 488 | cache_destroy_net(nn->nametoid_cache, net); |
1da177e4 LT |
489 | } |
490 | ||
1da177e4 LT |
491 | static int |
492 | idmap_lookup(struct svc_rqst *rqstp, | |
f890edbb SK |
493 | struct ent *(*lookup_fn)(struct cache_detail *, struct ent *), |
494 | struct ent *key, struct cache_detail *detail, struct ent **item) | |
1da177e4 | 495 | { |
1da177e4 LT |
496 | int ret; |
497 | ||
f890edbb | 498 | *item = lookup_fn(detail, key); |
839049a8 | 499 | if (!*item) |
1da177e4 | 500 | return -ENOMEM; |
839049a8 N |
501 | retry: |
502 | ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle); | |
503 | ||
504 | if (ret == -ETIMEDOUT) { | |
505 | struct ent *prev_item = *item; | |
f890edbb | 506 | *item = lookup_fn(detail, key); |
839049a8 N |
507 | if (*item != prev_item) |
508 | goto retry; | |
509 | cache_put(&(*item)->h, detail); | |
1da177e4 | 510 | } |
1da177e4 LT |
511 | return ret; |
512 | } | |
513 | ||
3ab4d8b1 BF |
514 | static char * |
515 | rqst_authname(struct svc_rqst *rqstp) | |
516 | { | |
517 | struct auth_domain *clp; | |
518 | ||
519 | clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client; | |
520 | return clp->name; | |
521 | } | |
522 | ||
3c726023 | 523 | static __be32 |
1da177e4 | 524 | idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, |
b5663898 | 525 | u32 *id) |
1da177e4 LT |
526 | { |
527 | struct ent *item, key = { | |
528 | .type = type, | |
529 | }; | |
530 | int ret; | |
9695c705 | 531 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
1da177e4 LT |
532 | |
533 | if (namelen + 1 > sizeof(key.name)) | |
3c726023 | 534 | return nfserr_badowner; |
1da177e4 LT |
535 | memcpy(key.name, name, namelen); |
536 | key.name[namelen] = '\0'; | |
3ab4d8b1 | 537 | strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
9e75a4de | 538 | ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item); |
1da177e4 | 539 | if (ret == -ENOENT) |
3c726023 | 540 | return nfserr_badowner; |
1da177e4 | 541 | if (ret) |
3c726023 | 542 | return nfserrno(ret); |
1da177e4 | 543 | *id = item->id; |
9e75a4de | 544 | cache_put(&item->h, nn->nametoid_cache); |
1da177e4 LT |
545 | return 0; |
546 | } | |
547 | ||
ddd1ea56 | 548 | static __be32 encode_ascii_id(struct xdr_stream *xdr, u32 id) |
3554116d BF |
549 | { |
550 | char buf[11]; | |
551 | int len; | |
ddd1ea56 | 552 | __be32 *p; |
3554116d BF |
553 | |
554 | len = sprintf(buf, "%u", id); | |
ddd1ea56 BF |
555 | p = xdr_reserve_space(xdr, len + 4); |
556 | if (!p) | |
3554116d | 557 | return nfserr_resource; |
ddd1ea56 | 558 | p = xdr_encode_opaque(p, buf, len); |
3554116d BF |
559 | return 0; |
560 | } | |
561 | ||
ddd1ea56 BF |
562 | static __be32 idmap_id_to_name(struct xdr_stream *xdr, |
563 | struct svc_rqst *rqstp, int type, u32 id) | |
1da177e4 LT |
564 | { |
565 | struct ent *item, key = { | |
566 | .id = id, | |
567 | .type = type, | |
568 | }; | |
ddd1ea56 | 569 | __be32 *p; |
1da177e4 | 570 | int ret; |
9695c705 | 571 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
1da177e4 | 572 | |
3ab4d8b1 | 573 | strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
c2e76ef5 | 574 | ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item); |
1da177e4 | 575 | if (ret == -ENOENT) |
ddd1ea56 | 576 | return encode_ascii_id(xdr, id); |
1da177e4 | 577 | if (ret) |
3554116d | 578 | return nfserrno(ret); |
1da177e4 | 579 | ret = strlen(item->name); |
3554116d | 580 | WARN_ON_ONCE(ret > IDMAP_NAMESZ); |
ddd1ea56 BF |
581 | p = xdr_reserve_space(xdr, ret + 4); |
582 | if (!p) | |
3554116d | 583 | return nfserr_resource; |
ddd1ea56 | 584 | p = xdr_encode_opaque(p, item->name, ret); |
c2e76ef5 | 585 | cache_put(&item->h, nn->idtoname_cache); |
3554116d | 586 | return 0; |
1da177e4 LT |
587 | } |
588 | ||
e9541ce8 | 589 | static bool |
b5663898 | 590 | numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id) |
e9541ce8 BF |
591 | { |
592 | int ret; | |
593 | char buf[11]; | |
594 | ||
595 | if (namelen + 1 > sizeof(buf)) | |
596 | /* too long to represent a 32-bit id: */ | |
597 | return false; | |
598 | /* Just to make sure it's null-terminated: */ | |
599 | memcpy(buf, name, namelen); | |
600 | buf[namelen] = '\0'; | |
9959ba0c | 601 | ret = kstrtouint(buf, 10, id); |
e9541ce8 BF |
602 | return ret == 0; |
603 | } | |
604 | ||
605 | static __be32 | |
b5663898 | 606 | do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id) |
e9541ce8 | 607 | { |
d5497fc6 | 608 | if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS) |
e9541ce8 BF |
609 | if (numeric_name_to_id(rqstp, type, name, namelen, id)) |
610 | return 0; | |
611 | /* | |
612 | * otherwise, fall through and try idmapping, for | |
613 | * backwards compatibility with clients sending names: | |
614 | */ | |
615 | return idmap_name_to_id(rqstp, type, name, namelen, id); | |
616 | } | |
617 | ||
ddd1ea56 BF |
618 | static __be32 encode_name_from_id(struct xdr_stream *xdr, |
619 | struct svc_rqst *rqstp, int type, u32 id) | |
e9541ce8 | 620 | { |
d5497fc6 | 621 | if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS) |
ddd1ea56 BF |
622 | return encode_ascii_id(xdr, id); |
623 | return idmap_id_to_name(xdr, rqstp, type, id); | |
e9541ce8 BF |
624 | } |
625 | ||
3c726023 | 626 | __be32 |
1da177e4 | 627 | nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen, |
65e10f6d | 628 | kuid_t *uid) |
1da177e4 | 629 | { |
65e10f6d EB |
630 | __be32 status; |
631 | u32 id = -1; | |
c3821b34 KM |
632 | |
633 | if (name == NULL || namelen == 0) | |
634 | return nfserr_inval; | |
635 | ||
65e10f6d EB |
636 | status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id); |
637 | *uid = make_kuid(&init_user_ns, id); | |
638 | if (!uid_valid(*uid)) | |
639 | status = nfserr_badowner; | |
640 | return status; | |
1da177e4 LT |
641 | } |
642 | ||
3c726023 | 643 | __be32 |
1da177e4 | 644 | nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen, |
65e10f6d | 645 | kgid_t *gid) |
1da177e4 | 646 | { |
65e10f6d EB |
647 | __be32 status; |
648 | u32 id = -1; | |
c3821b34 KM |
649 | |
650 | if (name == NULL || namelen == 0) | |
651 | return nfserr_inval; | |
652 | ||
65e10f6d EB |
653 | status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id); |
654 | *gid = make_kgid(&init_user_ns, id); | |
655 | if (!gid_valid(*gid)) | |
656 | status = nfserr_badowner; | |
657 | return status; | |
1da177e4 LT |
658 | } |
659 | ||
ddd1ea56 BF |
660 | __be32 nfsd4_encode_user(struct xdr_stream *xdr, struct svc_rqst *rqstp, |
661 | kuid_t uid) | |
1da177e4 | 662 | { |
65e10f6d | 663 | u32 id = from_kuid(&init_user_ns, uid); |
ddd1ea56 | 664 | return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id); |
1da177e4 LT |
665 | } |
666 | ||
ddd1ea56 BF |
667 | __be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp, |
668 | kgid_t gid) | |
1da177e4 | 669 | { |
65e10f6d | 670 | u32 id = from_kgid(&init_user_ns, gid); |
ddd1ea56 | 671 | return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id); |
1da177e4 | 672 | } |