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35#include <linux/module.h>
36#include <linux/seq_file.h>
37#include <linux/sched.h>
38#include <linux/slab.h>
39#include "idmap.h"
40#include "nfsd.h"
41
42
43
44
45
46
47
48
49
50
51#define IDMAP_TYPE_USER 0
52#define IDMAP_TYPE_GROUP 1
53
54struct ent {
55 struct cache_head h;
56 int type;
57 uid_t id;
58 char name[IDMAP_NAMESZ];
59 char authname[IDMAP_NAMESZ];
60};
61
62
63
64#define ENT_HASHBITS 8
65#define ENT_HASHMAX (1 << ENT_HASHBITS)
66#define ENT_HASHMASK (ENT_HASHMAX - 1)
67
68static void
69ent_init(struct cache_head *cnew, struct cache_head *citm)
70{
71 struct ent *new = container_of(cnew, struct ent, h);
72 struct ent *itm = container_of(citm, struct ent, h);
73
74 new->id = itm->id;
75 new->type = itm->type;
76
77 strlcpy(new->name, itm->name, sizeof(new->name));
78 strlcpy(new->authname, itm->authname, sizeof(new->name));
79}
80
81static void
82ent_put(struct kref *ref)
83{
84 struct ent *map = container_of(ref, struct ent, h.ref);
85 kfree(map);
86}
87
88static struct cache_head *
89ent_alloc(void)
90{
91 struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
92 if (e)
93 return &e->h;
94 else
95 return NULL;
96}
97
98
99
100
101
102static struct cache_head *idtoname_table[ENT_HASHMAX];
103
104static uint32_t
105idtoname_hash(struct ent *ent)
106{
107 uint32_t hash;
108
109 hash = hash_str(ent->authname, ENT_HASHBITS);
110 hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
111
112
113 if (ent->type == IDMAP_TYPE_GROUP)
114 hash ^= 1;
115
116 return hash;
117}
118
119static void
120idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
121 int *blen)
122{
123 struct ent *ent = container_of(ch, struct ent, h);
124 char idstr[11];
125
126 qword_add(bpp, blen, ent->authname);
127 snprintf(idstr, sizeof(idstr), "%u", ent->id);
128 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
129 qword_add(bpp, blen, idstr);
130
131 (*bpp)[-1] = '\n';
132}
133
134static int
135idtoname_upcall(struct cache_detail *cd, struct cache_head *ch)
136{
137 return sunrpc_cache_pipe_upcall(cd, ch, idtoname_request);
138}
139
140static int
141idtoname_match(struct cache_head *ca, struct cache_head *cb)
142{
143 struct ent *a = container_of(ca, struct ent, h);
144 struct ent *b = container_of(cb, struct ent, h);
145
146 return (a->id == b->id && a->type == b->type &&
147 strcmp(a->authname, b->authname) == 0);
148}
149
150static int
151idtoname_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);
160 seq_printf(m, "%s %s %u", ent->authname,
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
169static void
170warn_no_idmapd(struct cache_detail *detail, int has_died)
171{
172 printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
173 has_died ? "died" : "not been started");
174}
175
176
177static int idtoname_parse(struct cache_detail *, char *, int);
178static struct ent *idtoname_lookup(struct ent *);
179static struct ent *idtoname_update(struct ent *, struct ent *);
180
181static struct cache_detail idtoname_cache = {
182 .owner = THIS_MODULE,
183 .hash_size = ENT_HASHMAX,
184 .hash_table = idtoname_table,
185 .name = "nfs4.idtoname",
186 .cache_put = ent_put,
187 .cache_upcall = idtoname_upcall,
188 .cache_parse = idtoname_parse,
189 .cache_show = idtoname_show,
190 .warn_no_listener = warn_no_idmapd,
191 .match = idtoname_match,
192 .init = ent_init,
193 .update = ent_init,
194 .alloc = ent_alloc,
195};
196
197static int
198idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
199{
200 struct ent ent, *res;
201 char *buf1, *bp;
202 int len;
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
216 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
217 goto out;
218 memcpy(ent.authname, buf1, sizeof(ent.authname));
219
220
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
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
234 ent.h.expiry_time = get_expiry(&buf);
235 if (ent.h.expiry_time == 0)
236 goto out;
237
238 error = -ENOMEM;
239 res = idtoname_lookup(&ent);
240 if (!res)
241 goto out;
242
243
244 error = -EINVAL;
245 len = qword_get(&buf, buf1, PAGE_SIZE);
246 if (len < 0)
247 goto out;
248 if (len == 0)
249 set_bit(CACHE_NEGATIVE, &ent.h.flags);
250 else if (len >= IDMAP_NAMESZ)
251 goto out;
252 else
253 memcpy(ent.name, buf1, sizeof(ent.name));
254 error = -ENOMEM;
255 res = idtoname_update(&ent, res);
256 if (res == NULL)
257 goto out;
258
259 cache_put(&res->h, &idtoname_cache);
260
261 error = 0;
262out:
263 kfree(buf1);
264
265 return error;
266}
267
268
269static struct ent *
270idtoname_lookup(struct ent *item)
271{
272 struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache,
273 &item->h,
274 idtoname_hash(item));
275 if (ch)
276 return container_of(ch, struct ent, h);
277 else
278 return NULL;
279}
280
281static struct ent *
282idtoname_update(struct ent *new, struct ent *old)
283{
284 struct cache_head *ch = sunrpc_cache_update(&idtoname_cache,
285 &new->h, &old->h,
286 idtoname_hash(new));
287 if (ch)
288 return container_of(ch, struct ent, h);
289 else
290 return NULL;
291}
292
293
294
295
296
297
298static struct cache_head *nametoid_table[ENT_HASHMAX];
299
300static inline int
301nametoid_hash(struct ent *ent)
302{
303 return hash_str(ent->name, ENT_HASHBITS);
304}
305
306static void
307nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
308 int *blen)
309{
310 struct ent *ent = container_of(ch, struct ent, h);
311
312 qword_add(bpp, blen, ent->authname);
313 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
314 qword_add(bpp, blen, ent->name);
315
316 (*bpp)[-1] = '\n';
317}
318
319static int
320nametoid_upcall(struct cache_detail *cd, struct cache_head *ch)
321{
322 return sunrpc_cache_pipe_upcall(cd, ch, nametoid_request);
323}
324
325static int
326nametoid_match(struct cache_head *ca, struct cache_head *cb)
327{
328 struct ent *a = container_of(ca, struct ent, h);
329 struct ent *b = container_of(cb, struct ent, h);
330
331 return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
332 strcmp(a->authname, b->authname) == 0);
333}
334
335static int
336nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
337{
338 struct ent *ent;
339
340 if (h == NULL) {
341 seq_puts(m, "#domain type name [id]\n");
342 return 0;
343 }
344 ent = container_of(h, struct ent, h);
345 seq_printf(m, "%s %s %s", ent->authname,
346 ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
347 ent->name);
348 if (test_bit(CACHE_VALID, &h->flags))
349 seq_printf(m, " %u", ent->id);
350 seq_printf(m, "\n");
351 return 0;
352}
353
354static struct ent *nametoid_lookup(struct ent *);
355static struct ent *nametoid_update(struct ent *, struct ent *);
356static int nametoid_parse(struct cache_detail *, char *, int);
357
358static struct cache_detail nametoid_cache = {
359 .owner = THIS_MODULE,
360 .hash_size = ENT_HASHMAX,
361 .hash_table = nametoid_table,
362 .name = "nfs4.nametoid",
363 .cache_put = ent_put,
364 .cache_upcall = nametoid_upcall,
365 .cache_parse = nametoid_parse,
366 .cache_show = nametoid_show,
367 .warn_no_listener = warn_no_idmapd,
368 .match = nametoid_match,
369 .init = ent_init,
370 .update = ent_init,
371 .alloc = ent_alloc,
372};
373
374static int
375nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
376{
377 struct ent ent, *res;
378 char *buf1;
379 int error = -EINVAL;
380
381 if (buf[buflen - 1] != '\n')
382 return (-EINVAL);
383 buf[buflen - 1]= '\0';
384
385 buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
386 if (buf1 == NULL)
387 return (-ENOMEM);
388
389 memset(&ent, 0, sizeof(ent));
390
391
392 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
393 goto out;
394 memcpy(ent.authname, buf1, sizeof(ent.authname));
395
396
397 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
398 goto out;
399 ent.type = strcmp(buf1, "user") == 0 ?
400 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
401
402
403 error = qword_get(&buf, buf1, PAGE_SIZE);
404 if (error <= 0 || error >= IDMAP_NAMESZ)
405 goto out;
406 memcpy(ent.name, buf1, sizeof(ent.name));
407
408
409 ent.h.expiry_time = get_expiry(&buf);
410 if (ent.h.expiry_time == 0)
411 goto out;
412
413
414 error = get_int(&buf, &ent.id);
415 if (error == -EINVAL)
416 goto out;
417 if (error == -ENOENT)
418 set_bit(CACHE_NEGATIVE, &ent.h.flags);
419
420 error = -ENOMEM;
421 res = nametoid_lookup(&ent);
422 if (res == NULL)
423 goto out;
424 res = nametoid_update(&ent, res);
425 if (res == NULL)
426 goto out;
427
428 cache_put(&res->h, &nametoid_cache);
429 error = 0;
430out:
431 kfree(buf1);
432
433 return (error);
434}
435
436
437static struct ent *
438nametoid_lookup(struct ent *item)
439{
440 struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache,
441 &item->h,
442 nametoid_hash(item));
443 if (ch)
444 return container_of(ch, struct ent, h);
445 else
446 return NULL;
447}
448
449static struct ent *
450nametoid_update(struct ent *new, struct ent *old)
451{
452 struct cache_head *ch = sunrpc_cache_update(&nametoid_cache,
453 &new->h, &old->h,
454 nametoid_hash(new));
455 if (ch)
456 return container_of(ch, struct ent, h);
457 else
458 return NULL;
459}
460
461
462
463
464
465int
466nfsd_idmap_init(void)
467{
468 int rv;
469
470 rv = cache_register(&idtoname_cache);
471 if (rv)
472 return rv;
473 rv = cache_register(&nametoid_cache);
474 if (rv)
475 cache_unregister(&idtoname_cache);
476 return rv;
477}
478
479void
480nfsd_idmap_shutdown(void)
481{
482 cache_unregister(&idtoname_cache);
483 cache_unregister(&nametoid_cache);
484}
485
486static int
487idmap_lookup(struct svc_rqst *rqstp,
488 struct ent *(*lookup_fn)(struct ent *), struct ent *key,
489 struct cache_detail *detail, struct ent **item)
490{
491 int ret;
492
493 *item = lookup_fn(key);
494 if (!*item)
495 return -ENOMEM;
496 retry:
497 ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
498
499 if (ret == -ETIMEDOUT) {
500 struct ent *prev_item = *item;
501 *item = lookup_fn(key);
502 if (*item != prev_item)
503 goto retry;
504 cache_put(&(*item)->h, detail);
505 }
506 return ret;
507}
508
509static char *
510rqst_authname(struct svc_rqst *rqstp)
511{
512 struct auth_domain *clp;
513
514 clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
515 return clp->name;
516}
517
518static __be32
519idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
520 uid_t *id)
521{
522 struct ent *item, key = {
523 .type = type,
524 };
525 int ret;
526
527 if (namelen + 1 > sizeof(key.name))
528 return nfserr_badowner;
529 memcpy(key.name, name, namelen);
530 key.name[namelen] = '\0';
531 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
532 ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item);
533 if (ret == -ENOENT)
534 return nfserr_badowner;
535 if (ret)
536 return nfserrno(ret);
537 *id = item->id;
538 cache_put(&item->h, &nametoid_cache);
539 return 0;
540}
541
542static int
543idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
544{
545 struct ent *item, key = {
546 .id = id,
547 .type = type,
548 };
549 int ret;
550
551 strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
552 ret = idmap_lookup(rqstp, idtoname_lookup, &key, &idtoname_cache, &item);
553 if (ret == -ENOENT)
554 return sprintf(name, "%u", id);
555 if (ret)
556 return ret;
557 ret = strlen(item->name);
558 BUG_ON(ret > IDMAP_NAMESZ);
559 memcpy(name, item->name, ret);
560 cache_put(&item->h, &idtoname_cache);
561 return ret;
562}
563
564__be32
565nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
566 __u32 *id)
567{
568 return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
569}
570
571__be32
572nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
573 __u32 *id)
574{
575 return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
576}
577
578int
579nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
580{
581 return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
582}
583
584int
585nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
586{
587 return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
588}
589