Commit | Line | Data |
---|---|---|
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 | ||
62 | #define IDMAP_TYPE_USER 0 | |
63 | #define IDMAP_TYPE_GROUP 1 | |
64 | ||
65 | struct ent { | |
66 | struct cache_head h; | |
67 | int type; /* User / Group */ | |
b5663898 | 68 | u32 id; |
1da177e4 LT |
69 | char name[IDMAP_NAMESZ]; |
70 | char authname[IDMAP_NAMESZ]; | |
71 | }; | |
72 | ||
1da177e4 LT |
73 | /* Common entry handling */ |
74 | ||
75 | #define ENT_HASHBITS 8 | |
76 | #define ENT_HASHMAX (1 << ENT_HASHBITS) | |
1da177e4 | 77 | |
f9ecc921 N |
78 | static void |
79 | ent_init(struct cache_head *cnew, struct cache_head *citm) | |
1da177e4 | 80 | { |
f9ecc921 N |
81 | struct ent *new = container_of(cnew, struct ent, h); |
82 | struct ent *itm = container_of(citm, struct ent, h); | |
83 | ||
1da177e4 LT |
84 | 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 | ||
fd39ca9a | 91 | static void |
baab935f | 92 | ent_put(struct kref *ref) |
1da177e4 | 93 | { |
baab935f N |
94 | struct ent *map = container_of(ref, struct ent, h.ref); |
95 | kfree(map); | |
1da177e4 LT |
96 | } |
97 | ||
f9ecc921 N |
98 | static struct cache_head * |
99 | ent_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 | ||
1da177e4 LT |
108 | /* |
109 | * ID -> Name cache | |
110 | */ | |
111 | ||
1da177e4 LT |
112 | static uint32_t |
113 | idtoname_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 | ||
127 | static void | |
128 | idtoname_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); | |
0a725fc4 | 135 | snprintf(idstr, sizeof(idstr), "%u", ent->id); |
1da177e4 LT |
136 | qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); |
137 | qword_add(bpp, blen, idstr); | |
138 | ||
139 | (*bpp)[-1] = '\n'; | |
140 | } | |
141 | ||
f9ecc921 N |
142 | static int |
143 | idtoname_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 144 | { |
f9ecc921 N |
145 | struct ent *a = container_of(ca, struct ent, h); |
146 | struct ent *b = container_of(cb, struct ent, h); | |
147 | ||
1da177e4 LT |
148 | return (a->id == b->id && a->type == b->type && |
149 | strcmp(a->authname, b->authname) == 0); | |
150 | } | |
151 | ||
152 | static int | |
153 | idtoname_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); | |
0a725fc4 | 162 | seq_printf(m, "%s %s %u", ent->authname, |
1da177e4 LT |
163 | 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 | ||
171 | static void | |
2da8ca26 | 172 | warn_no_idmapd(struct cache_detail *detail, int has_died) |
1da177e4 LT |
173 | { |
174 | printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n", | |
2da8ca26 | 175 | has_died ? "died" : "not been started"); |
1da177e4 LT |
176 | } |
177 | ||
178 | ||
179 | static int idtoname_parse(struct cache_detail *, char *, int); | |
f890edbb SK |
180 | static struct ent *idtoname_lookup(struct cache_detail *, struct ent *); |
181 | static struct ent *idtoname_update(struct cache_detail *, struct ent *, | |
182 | struct ent *); | |
1da177e4 | 183 | |
c2e76ef5 | 184 | static struct cache_detail idtoname_cache_template = { |
f35279d3 | 185 | .owner = THIS_MODULE, |
1da177e4 | 186 | .hash_size = ENT_HASHMAX, |
1da177e4 LT |
187 | .name = "nfs4.idtoname", |
188 | .cache_put = ent_put, | |
73fb847a | 189 | .cache_request = idtoname_request, |
1da177e4 LT |
190 | .cache_parse = idtoname_parse, |
191 | .cache_show = idtoname_show, | |
192 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
193 | .match = idtoname_match, |
194 | .init = ent_init, | |
195 | .update = ent_init, | |
196 | .alloc = ent_alloc, | |
1da177e4 LT |
197 | }; |
198 | ||
a254b246 | 199 | static int |
1da177e4 LT |
200 | idtoname_parse(struct cache_detail *cd, char *buf, int buflen) |
201 | { | |
202 | struct ent ent, *res; | |
203 | char *buf1, *bp; | |
c9b6cbe5 | 204 | int len; |
1da177e4 LT |
205 | 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 | ||
f9ecc921 | 240 | error = -ENOMEM; |
f890edbb | 241 | res = idtoname_lookup(cd, &ent); |
f9ecc921 N |
242 | if (!res) |
243 | goto out; | |
244 | ||
1da177e4 | 245 | /* Name */ |
c9b6cbe5 BF |
246 | error = -EINVAL; |
247 | len = qword_get(&buf, buf1, PAGE_SIZE); | |
248 | if (len < 0) | |
1da177e4 | 249 | goto out; |
c9b6cbe5 | 250 | if (len == 0) |
1da177e4 | 251 | set_bit(CACHE_NEGATIVE, &ent.h.flags); |
d4395e03 BF |
252 | else if (len >= IDMAP_NAMESZ) |
253 | goto out; | |
254 | else | |
1da177e4 | 255 | memcpy(ent.name, buf1, sizeof(ent.name)); |
1da177e4 | 256 | error = -ENOMEM; |
f890edbb | 257 | res = idtoname_update(cd, &ent, res); |
f9ecc921 | 258 | if (res == NULL) |
1da177e4 LT |
259 | goto out; |
260 | ||
f890edbb | 261 | cache_put(&res->h, cd); |
1da177e4 LT |
262 | |
263 | error = 0; | |
264 | out: | |
265 | kfree(buf1); | |
266 | ||
267 | return error; | |
268 | } | |
269 | ||
f9ecc921 N |
270 | |
271 | static struct ent * | |
f890edbb | 272 | idtoname_lookup(struct cache_detail *cd, struct ent *item) |
f9ecc921 | 273 | { |
f890edbb | 274 | struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h, |
f9ecc921 N |
275 | idtoname_hash(item)); |
276 | if (ch) | |
277 | return container_of(ch, struct ent, h); | |
278 | else | |
279 | return NULL; | |
280 | } | |
281 | ||
282 | static struct ent * | |
f890edbb | 283 | idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old) |
f9ecc921 | 284 | { |
f890edbb | 285 | struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h, |
f9ecc921 N |
286 | idtoname_hash(new)); |
287 | if (ch) | |
288 | return container_of(ch, struct ent, h); | |
289 | else | |
290 | return NULL; | |
291 | } | |
292 | ||
1da177e4 LT |
293 | |
294 | /* | |
295 | * Name -> ID cache | |
296 | */ | |
297 | ||
1da177e4 LT |
298 | static inline int |
299 | nametoid_hash(struct ent *ent) | |
300 | { | |
301 | return hash_str(ent->name, ENT_HASHBITS); | |
302 | } | |
303 | ||
fd39ca9a | 304 | static void |
1da177e4 LT |
305 | nametoid_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 | ||
f9ecc921 N |
317 | static int |
318 | nametoid_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 319 | { |
f9ecc921 N |
320 | struct ent *a = container_of(ca, struct ent, h); |
321 | struct ent *b = container_of(cb, struct ent, h); | |
322 | ||
1da177e4 LT |
323 | return (a->type == b->type && strcmp(a->name, b->name) == 0 && |
324 | strcmp(a->authname, b->authname) == 0); | |
325 | } | |
326 | ||
327 | static int | |
328 | nametoid_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)) | |
0a725fc4 | 341 | seq_printf(m, " %u", ent->id); |
1da177e4 LT |
342 | seq_printf(m, "\n"); |
343 | return 0; | |
344 | } | |
345 | ||
f890edbb SK |
346 | static struct ent *nametoid_lookup(struct cache_detail *, struct ent *); |
347 | static struct ent *nametoid_update(struct cache_detail *, struct ent *, | |
348 | struct ent *); | |
fd39ca9a | 349 | static int nametoid_parse(struct cache_detail *, char *, int); |
1da177e4 | 350 | |
9e75a4de | 351 | static struct cache_detail nametoid_cache_template = { |
f35279d3 | 352 | .owner = THIS_MODULE, |
1da177e4 | 353 | .hash_size = ENT_HASHMAX, |
1da177e4 LT |
354 | .name = "nfs4.nametoid", |
355 | .cache_put = ent_put, | |
73fb847a | 356 | .cache_request = nametoid_request, |
1da177e4 LT |
357 | .cache_parse = nametoid_parse, |
358 | .cache_show = nametoid_show, | |
359 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
360 | .match = nametoid_match, |
361 | .init = ent_init, | |
362 | .update = ent_init, | |
363 | .alloc = ent_alloc, | |
1da177e4 LT |
364 | }; |
365 | ||
fd39ca9a | 366 | static int |
1da177e4 LT |
367 | nametoid_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; | |
f890edbb | 413 | res = nametoid_lookup(cd, &ent); |
f9ecc921 N |
414 | if (res == NULL) |
415 | goto out; | |
f890edbb | 416 | res = nametoid_update(cd, &ent, res); |
f9ecc921 | 417 | if (res == NULL) |
1da177e4 LT |
418 | goto out; |
419 | ||
f890edbb | 420 | cache_put(&res->h, cd); |
1da177e4 LT |
421 | error = 0; |
422 | out: | |
423 | kfree(buf1); | |
424 | ||
425 | return (error); | |
426 | } | |
427 | ||
f9ecc921 N |
428 | |
429 | static struct ent * | |
f890edbb | 430 | nametoid_lookup(struct cache_detail *cd, struct ent *item) |
f9ecc921 | 431 | { |
f890edbb | 432 | struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h, |
f9ecc921 N |
433 | nametoid_hash(item)); |
434 | if (ch) | |
435 | return container_of(ch, struct ent, h); | |
436 | else | |
437 | return NULL; | |
438 | } | |
439 | ||
440 | static struct ent * | |
f890edbb | 441 | nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old) |
f9ecc921 | 442 | { |
f890edbb | 443 | struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h, |
f9ecc921 N |
444 | nametoid_hash(new)); |
445 | if (ch) | |
446 | return container_of(ch, struct ent, h); | |
447 | else | |
448 | return NULL; | |
449 | } | |
1da177e4 LT |
450 | |
451 | /* | |
452 | * Exported API | |
453 | */ | |
454 | ||
dbf847ec | 455 | int |
43ec1a20 | 456 | nfsd_idmap_init(struct net *net) |
1da177e4 | 457 | { |
dbf847ec | 458 | int rv; |
c2e76ef5 | 459 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
dbf847ec | 460 | |
c2e76ef5 SK |
461 | 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); | |
dbf847ec | 465 | if (rv) |
c2e76ef5 | 466 | goto destroy_idtoname_cache; |
9e75a4de SK |
467 | nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net); |
468 | if (IS_ERR(nn->nametoid_cache)) { | |
92566e28 | 469 | rv = PTR_ERR(nn->nametoid_cache); |
c2e76ef5 | 470 | goto unregister_idtoname_cache; |
9e75a4de SK |
471 | } |
472 | rv = cache_register_net(nn->nametoid_cache, net); | |
473 | if (rv) | |
474 | goto destroy_nametoid_cache; | |
c2e76ef5 SK |
475 | return 0; |
476 | ||
9e75a4de SK |
477 | destroy_nametoid_cache: |
478 | cache_destroy_net(nn->nametoid_cache, net); | |
c2e76ef5 SK |
479 | unregister_idtoname_cache: |
480 | cache_unregister_net(nn->idtoname_cache, net); | |
481 | destroy_idtoname_cache: | |
482 | cache_destroy_net(nn->idtoname_cache, net); | |
dbf847ec | 483 | return rv; |
1da177e4 LT |
484 | } |
485 | ||
486 | void | |
43ec1a20 | 487 | nfsd_idmap_shutdown(struct net *net) |
1da177e4 | 488 | { |
c2e76ef5 SK |
489 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
490 | ||
491 | cache_unregister_net(nn->idtoname_cache, net); | |
9e75a4de | 492 | cache_unregister_net(nn->nametoid_cache, net); |
c2e76ef5 | 493 | cache_destroy_net(nn->idtoname_cache, net); |
9e75a4de | 494 | cache_destroy_net(nn->nametoid_cache, net); |
1da177e4 LT |
495 | } |
496 | ||
1da177e4 LT |
497 | static int |
498 | idmap_lookup(struct svc_rqst *rqstp, | |
f890edbb SK |
499 | struct ent *(*lookup_fn)(struct cache_detail *, struct ent *), |
500 | struct ent *key, struct cache_detail *detail, struct ent **item) | |
1da177e4 | 501 | { |
1da177e4 LT |
502 | int ret; |
503 | ||
f890edbb | 504 | *item = lookup_fn(detail, key); |
839049a8 | 505 | if (!*item) |
1da177e4 | 506 | return -ENOMEM; |
839049a8 N |
507 | retry: |
508 | ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle); | |
509 | ||
510 | if (ret == -ETIMEDOUT) { | |
511 | struct ent *prev_item = *item; | |
f890edbb | 512 | *item = lookup_fn(detail, key); |
839049a8 N |
513 | if (*item != prev_item) |
514 | goto retry; | |
515 | cache_put(&(*item)->h, detail); | |
1da177e4 | 516 | } |
1da177e4 LT |
517 | return ret; |
518 | } | |
519 | ||
3ab4d8b1 BF |
520 | static char * |
521 | rqst_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 | ||
3c726023 | 529 | static __be32 |
1da177e4 | 530 | idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, |
b5663898 | 531 | u32 *id) |
1da177e4 LT |
532 | { |
533 | struct ent *item, key = { | |
534 | .type = type, | |
535 | }; | |
536 | int ret; | |
9695c705 | 537 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
1da177e4 LT |
538 | |
539 | if (namelen + 1 > sizeof(key.name)) | |
3c726023 | 540 | return nfserr_badowner; |
1da177e4 LT |
541 | memcpy(key.name, name, namelen); |
542 | key.name[namelen] = '\0'; | |
3ab4d8b1 | 543 | strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
9e75a4de | 544 | ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item); |
1da177e4 | 545 | if (ret == -ENOENT) |
3c726023 | 546 | return nfserr_badowner; |
1da177e4 | 547 | if (ret) |
3c726023 | 548 | return nfserrno(ret); |
1da177e4 | 549 | *id = item->id; |
9e75a4de | 550 | cache_put(&item->h, nn->nametoid_cache); |
1da177e4 LT |
551 | return 0; |
552 | } | |
553 | ||
554 | static int | |
b5663898 | 555 | idmap_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name) |
1da177e4 LT |
556 | { |
557 | struct ent *item, key = { | |
558 | .id = id, | |
559 | .type = type, | |
560 | }; | |
561 | int ret; | |
9695c705 | 562 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
1da177e4 | 563 | |
3ab4d8b1 | 564 | strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
c2e76ef5 | 565 | ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item); |
1da177e4 LT |
566 | 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); | |
c2e76ef5 | 573 | cache_put(&item->h, nn->idtoname_cache); |
1da177e4 LT |
574 | return ret; |
575 | } | |
576 | ||
e9541ce8 | 577 | static bool |
b5663898 | 578 | numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id) |
e9541ce8 BF |
579 | { |
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'; | |
9959ba0c | 589 | ret = kstrtouint(buf, 10, id); |
e9541ce8 BF |
590 | return ret == 0; |
591 | } | |
592 | ||
593 | static __be32 | |
b5663898 | 594 | do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id) |
e9541ce8 | 595 | { |
d5497fc6 | 596 | if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS) |
e9541ce8 BF |
597 | 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 | ||
606 | static int | |
b5663898 | 607 | do_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name) |
e9541ce8 | 608 | { |
d5497fc6 | 609 | if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS) |
e9541ce8 BF |
610 | return sprintf(name, "%u", id); |
611 | return idmap_id_to_name(rqstp, type, id, name); | |
612 | } | |
613 | ||
3c726023 | 614 | __be32 |
1da177e4 | 615 | nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen, |
65e10f6d | 616 | kuid_t *uid) |
1da177e4 | 617 | { |
65e10f6d EB |
618 | __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; | |
1da177e4 LT |
625 | } |
626 | ||
3c726023 | 627 | __be32 |
1da177e4 | 628 | nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen, |
65e10f6d | 629 | kgid_t *gid) |
1da177e4 | 630 | { |
65e10f6d EB |
631 | __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; | |
1da177e4 LT |
638 | } |
639 | ||
640 | int | |
65e10f6d | 641 | nfsd_map_uid_to_name(struct svc_rqst *rqstp, kuid_t uid, char *name) |
1da177e4 | 642 | { |
65e10f6d | 643 | u32 id = from_kuid(&init_user_ns, uid); |
e9541ce8 | 644 | return do_id_to_name(rqstp, IDMAP_TYPE_USER, id, name); |
1da177e4 LT |
645 | } |
646 | ||
647 | int | |
65e10f6d | 648 | nfsd_map_gid_to_name(struct svc_rqst *rqstp, kgid_t gid, char *name) |
1da177e4 | 649 | { |
65e10f6d | 650 | u32 id = from_kgid(&init_user_ns, gid); |
e9541ce8 | 651 | return do_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name); |
1da177e4 | 652 | } |