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1 | /* |
2 | * linux/net/sunrpc/auth.c |
3 | * |
4 | * Generic RPC client authentication API. |
5 | * |
6 | * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> |
7 | */ |
8 | |
9 | #include <linux/types.h> |
10 | #include <linux/sched.h> |
11 | #include <linux/module.h> |
12 | #include <linux/slab.h> |
13 | #include <linux/errno.h> |
14 | #include <linux/hash.h> |
15 | #include <linux/sunrpc/clnt.h> |
16 | #include <linux/sunrpc/gss_api.h> |
17 | #include <linux/spinlock.h> |
18 | |
19 | #ifdef RPC_DEBUG |
20 | # define RPCDBG_FACILITY RPCDBG_AUTH |
21 | #endif |
22 | |
23 | #define RPC_CREDCACHE_DEFAULT_HASHBITS (4) |
24 | struct rpc_cred_cache { |
25 | struct hlist_head *hashtable; |
26 | unsigned int hashbits; |
27 | spinlock_t lock; |
28 | }; |
29 | |
30 | static unsigned int auth_hashbits = RPC_CREDCACHE_DEFAULT_HASHBITS; |
31 | |
32 | static DEFINE_SPINLOCK(rpc_authflavor_lock); |
33 | static const struct rpc_authops *auth_flavors[RPC_AUTH_MAXFLAVOR] = { |
34 | &authnull_ops, /* AUTH_NULL */ |
35 | &authunix_ops, /* AUTH_UNIX */ |
36 | NULL, /* others can be loadable modules */ |
37 | }; |
38 | |
39 | static LIST_HEAD(cred_unused); |
40 | static unsigned long number_cred_unused; |
41 | |
42 | #define MAX_HASHTABLE_BITS (14) |
43 | static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp) |
44 | { |
45 | unsigned long num; |
46 | unsigned int nbits; |
47 | int ret; |
48 | |
49 | if (!val) |
50 | goto out_inval; |
51 | ret = strict_strtoul(val, 0, &num); |
52 | if (ret == -EINVAL) |
53 | goto out_inval; |
54 | nbits = fls(num); |
55 | if (num > (1U << nbits)) |
56 | nbits++; |
57 | if (nbits > MAX_HASHTABLE_BITS || nbits < 2) |
58 | goto out_inval; |
59 | *(unsigned int *)kp->arg = nbits; |
60 | return 0; |
61 | out_inval: |
62 | return -EINVAL; |
63 | } |
64 | |
65 | static int param_get_hashtbl_sz(char *buffer, const struct kernel_param *kp) |
66 | { |
67 | unsigned int nbits; |
68 | |
69 | nbits = *(unsigned int *)kp->arg; |
70 | return sprintf(buffer, "%u", 1U << nbits); |
71 | } |
72 | |
73 | #define param_check_hashtbl_sz(name, p) __param_check(name, p, unsigned int); |
74 | |
75 | static struct kernel_param_ops param_ops_hashtbl_sz = { |
76 | .set = param_set_hashtbl_sz, |
77 | .get = param_get_hashtbl_sz, |
78 | }; |
79 | |
80 | module_param_named(auth_hashtable_size, auth_hashbits, hashtbl_sz, 0644); |
81 | MODULE_PARM_DESC(auth_hashtable_size, "RPC credential cache hashtable size"); |
82 | |
83 | static u32 |
84 | pseudoflavor_to_flavor(u32 flavor) { |
85 | if (flavor > RPC_AUTH_MAXFLAVOR) |
86 | return RPC_AUTH_GSS; |
87 | return flavor; |
88 | } |
89 | |
90 | int |
91 | rpcauth_register(const struct rpc_authops *ops) |
92 | { |
93 | rpc_authflavor_t flavor; |
94 | int ret = -EPERM; |
95 | |
96 | if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) |
97 | return -EINVAL; |
98 | spin_lock(&rpc_authflavor_lock); |
99 | if (auth_flavors[flavor] == NULL) { |
100 | auth_flavors[flavor] = ops; |
101 | ret = 0; |
102 | } |
103 | spin_unlock(&rpc_authflavor_lock); |
104 | return ret; |
105 | } |
106 | EXPORT_SYMBOL_GPL(rpcauth_register); |
107 | |
108 | int |
109 | rpcauth_unregister(const struct rpc_authops *ops) |
110 | { |
111 | rpc_authflavor_t flavor; |
112 | int ret = -EPERM; |
113 | |
114 | if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) |
115 | return -EINVAL; |
116 | spin_lock(&rpc_authflavor_lock); |
117 | if (auth_flavors[flavor] == ops) { |
118 | auth_flavors[flavor] = NULL; |
119 | ret = 0; |
120 | } |
121 | spin_unlock(&rpc_authflavor_lock); |
122 | return ret; |
123 | } |
124 | EXPORT_SYMBOL_GPL(rpcauth_unregister); |
125 | |
126 | /** |
127 | * rpcauth_get_pseudoflavor - check if security flavor is supported |
128 | * @flavor: a security flavor |
129 | * @info: a GSS mech OID, quality of protection, and service value |
130 | * |
131 | * Verifies that an appropriate kernel module is available or already loaded. |
132 | * Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is |
133 | * not supported locally. |
134 | */ |
135 | rpc_authflavor_t |
136 | rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info) |
137 | { |
138 | const struct rpc_authops *ops; |
139 | rpc_authflavor_t pseudoflavor; |
140 | |
141 | ops = auth_flavors[flavor]; |
142 | if (ops == NULL) |
143 | request_module("rpc-auth-%u", flavor); |
144 | spin_lock(&rpc_authflavor_lock); |
145 | ops = auth_flavors[flavor]; |
146 | if (ops == NULL || !try_module_get(ops->owner)) { |
147 | spin_unlock(&rpc_authflavor_lock); |
148 | return RPC_AUTH_MAXFLAVOR; |
149 | } |
150 | spin_unlock(&rpc_authflavor_lock); |
151 | |
152 | pseudoflavor = flavor; |
153 | if (ops->info2flavor != NULL) |
154 | pseudoflavor = ops->info2flavor(info); |
155 | |
156 | module_put(ops->owner); |
157 | return pseudoflavor; |
158 | } |
159 | EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor); |
160 | |
161 | /** |
162 | * rpcauth_get_gssinfo - find GSS tuple matching a GSS pseudoflavor |
163 | * @pseudoflavor: GSS pseudoflavor to match |
164 | * @info: rpcsec_gss_info structure to fill in |
165 | * |
166 | * Returns zero and fills in "info" if pseudoflavor matches a |
167 | * supported mechanism. |
168 | */ |
169 | int |
170 | rpcauth_get_gssinfo(rpc_authflavor_t pseudoflavor, struct rpcsec_gss_info *info) |
171 | { |
172 | rpc_authflavor_t flavor = pseudoflavor_to_flavor(pseudoflavor); |
173 | const struct rpc_authops *ops; |
174 | int result; |
175 | |
176 | if (flavor >= RPC_AUTH_MAXFLAVOR) |
177 | return -EINVAL; |
178 | |
179 | ops = auth_flavors[flavor]; |
180 | if (ops == NULL) |
181 | request_module("rpc-auth-%u", flavor); |
182 | spin_lock(&rpc_authflavor_lock); |
183 | ops = auth_flavors[flavor]; |
184 | if (ops == NULL || !try_module_get(ops->owner)) { |
185 | spin_unlock(&rpc_authflavor_lock); |
186 | return -ENOENT; |
187 | } |
188 | spin_unlock(&rpc_authflavor_lock); |
189 | |
190 | result = -ENOENT; |
191 | if (ops->flavor2info != NULL) |
192 | result = ops->flavor2info(pseudoflavor, info); |
193 | |
194 | module_put(ops->owner); |
195 | return result; |
196 | } |
197 | EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo); |
198 | |
199 | /** |
200 | * rpcauth_list_flavors - discover registered flavors and pseudoflavors |
201 | * @array: array to fill in |
202 | * @size: size of "array" |
203 | * |
204 | * Returns the number of array items filled in, or a negative errno. |
205 | * |
206 | * The returned array is not sorted by any policy. Callers should not |
207 | * rely on the order of the items in the returned array. |
208 | */ |
209 | int |
210 | rpcauth_list_flavors(rpc_authflavor_t *array, int size) |
211 | { |
212 | rpc_authflavor_t flavor; |
213 | int result = 0; |
214 | |
215 | spin_lock(&rpc_authflavor_lock); |
216 | for (flavor = 0; flavor < RPC_AUTH_MAXFLAVOR; flavor++) { |
217 | const struct rpc_authops *ops = auth_flavors[flavor]; |
218 | rpc_authflavor_t pseudos[4]; |
219 | int i, len; |
220 | |
221 | if (result >= size) { |
222 | result = -ENOMEM; |
223 | break; |
224 | } |
225 | |
226 | if (ops == NULL) |
227 | continue; |
228 | if (ops->list_pseudoflavors == NULL) { |
229 | array[result++] = ops->au_flavor; |
230 | continue; |
231 | } |
232 | len = ops->list_pseudoflavors(pseudos, ARRAY_SIZE(pseudos)); |
233 | if (len < 0) { |
234 | result = len; |
235 | break; |
236 | } |
237 | for (i = 0; i < len; i++) { |
238 | if (result >= size) { |
239 | result = -ENOMEM; |
240 | break; |
241 | } |
242 | array[result++] = pseudos[i]; |
243 | } |
244 | } |
245 | spin_unlock(&rpc_authflavor_lock); |
246 | |
247 | dprintk("RPC: %s returns %d\n", __func__, result); |
248 | return result; |
249 | } |
250 | EXPORT_SYMBOL_GPL(rpcauth_list_flavors); |
251 | |
252 | struct rpc_auth * |
253 | rpcauth_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
254 | { |
255 | struct rpc_auth *auth; |
256 | const struct rpc_authops *ops; |
257 | u32 flavor = pseudoflavor_to_flavor(args->pseudoflavor); |
258 | |
259 | auth = ERR_PTR(-EINVAL); |
260 | if (flavor >= RPC_AUTH_MAXFLAVOR) |
261 | goto out; |
262 | |
263 | if ((ops = auth_flavors[flavor]) == NULL) |
264 | request_module("rpc-auth-%u", flavor); |
265 | spin_lock(&rpc_authflavor_lock); |
266 | ops = auth_flavors[flavor]; |
267 | if (ops == NULL || !try_module_get(ops->owner)) { |
268 | spin_unlock(&rpc_authflavor_lock); |
269 | goto out; |
270 | } |
271 | spin_unlock(&rpc_authflavor_lock); |
272 | auth = ops->create(args, clnt); |
273 | module_put(ops->owner); |
274 | if (IS_ERR(auth)) |
275 | return auth; |
276 | if (clnt->cl_auth) |
277 | rpcauth_release(clnt->cl_auth); |
278 | clnt->cl_auth = auth; |
279 | |
280 | out: |
281 | return auth; |
282 | } |
283 | EXPORT_SYMBOL_GPL(rpcauth_create); |
284 | |
285 | void |
286 | rpcauth_release(struct rpc_auth *auth) |
287 | { |
288 | if (!atomic_dec_and_test(&auth->au_count)) |
289 | return; |
290 | auth->au_ops->destroy(auth); |
291 | } |
292 | |
293 | static DEFINE_SPINLOCK(rpc_credcache_lock); |
294 | |
295 | static void |
296 | rpcauth_unhash_cred_locked(struct rpc_cred *cred) |
297 | { |
298 | hlist_del_rcu(&cred->cr_hash); |
299 | smp_mb__before_clear_bit(); |
300 | clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags); |
301 | } |
302 | |
303 | static int |
304 | rpcauth_unhash_cred(struct rpc_cred *cred) |
305 | { |
306 | spinlock_t *cache_lock; |
307 | int ret; |
308 | |
309 | cache_lock = &cred->cr_auth->au_credcache->lock; |
310 | spin_lock(cache_lock); |
311 | ret = atomic_read(&cred->cr_count) == 0; |
312 | if (ret) |
313 | rpcauth_unhash_cred_locked(cred); |
314 | spin_unlock(cache_lock); |
315 | return ret; |
316 | } |
317 | |
318 | /* |
319 | * Initialize RPC credential cache |
320 | */ |
321 | int |
322 | rpcauth_init_credcache(struct rpc_auth *auth) |
323 | { |
324 | struct rpc_cred_cache *new; |
325 | unsigned int hashsize; |
326 | |
327 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
328 | if (!new) |
329 | goto out_nocache; |
330 | new->hashbits = auth_hashbits; |
331 | hashsize = 1U << new->hashbits; |
332 | new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL); |
333 | if (!new->hashtable) |
334 | goto out_nohashtbl; |
335 | spin_lock_init(&new->lock); |
336 | auth->au_credcache = new; |
337 | return 0; |
338 | out_nohashtbl: |
339 | kfree(new); |
340 | out_nocache: |
341 | return -ENOMEM; |
342 | } |
343 | EXPORT_SYMBOL_GPL(rpcauth_init_credcache); |
344 | |
345 | /* |
346 | * Setup a credential key lifetime timeout notification |
347 | */ |
348 | int |
349 | rpcauth_key_timeout_notify(struct rpc_auth *auth, struct rpc_cred *cred) |
350 | { |
351 | if (!cred->cr_auth->au_ops->key_timeout) |
352 | return 0; |
353 | return cred->cr_auth->au_ops->key_timeout(auth, cred); |
354 | } |
355 | EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify); |
356 | |
357 | bool |
358 | rpcauth_cred_key_to_expire(struct rpc_cred *cred) |
359 | { |
360 | if (!cred->cr_ops->crkey_to_expire) |
361 | return false; |
362 | return cred->cr_ops->crkey_to_expire(cred); |
363 | } |
364 | EXPORT_SYMBOL_GPL(rpcauth_cred_key_to_expire); |
365 | |
366 | /* |
367 | * Destroy a list of credentials |
368 | */ |
369 | static inline |
370 | void rpcauth_destroy_credlist(struct list_head *head) |
371 | { |
372 | struct rpc_cred *cred; |
373 | |
374 | while (!list_empty(head)) { |
375 | cred = list_entry(head->next, struct rpc_cred, cr_lru); |
376 | list_del_init(&cred->cr_lru); |
377 | put_rpccred(cred); |
378 | } |
379 | } |
380 | |
381 | /* |
382 | * Clear the RPC credential cache, and delete those credentials |
383 | * that are not referenced. |
384 | */ |
385 | void |
386 | rpcauth_clear_credcache(struct rpc_cred_cache *cache) |
387 | { |
388 | LIST_HEAD(free); |
389 | struct hlist_head *head; |
390 | struct rpc_cred *cred; |
391 | unsigned int hashsize = 1U << cache->hashbits; |
392 | int i; |
393 | |
394 | spin_lock(&rpc_credcache_lock); |
395 | spin_lock(&cache->lock); |
396 | for (i = 0; i < hashsize; i++) { |
397 | head = &cache->hashtable[i]; |
398 | while (!hlist_empty(head)) { |
399 | cred = hlist_entry(head->first, struct rpc_cred, cr_hash); |
400 | get_rpccred(cred); |
401 | if (!list_empty(&cred->cr_lru)) { |
402 | list_del(&cred->cr_lru); |
403 | number_cred_unused--; |
404 | } |
405 | list_add_tail(&cred->cr_lru, &free); |
406 | rpcauth_unhash_cred_locked(cred); |
407 | } |
408 | } |
409 | spin_unlock(&cache->lock); |
410 | spin_unlock(&rpc_credcache_lock); |
411 | rpcauth_destroy_credlist(&free); |
412 | } |
413 | |
414 | /* |
415 | * Destroy the RPC credential cache |
416 | */ |
417 | void |
418 | rpcauth_destroy_credcache(struct rpc_auth *auth) |
419 | { |
420 | struct rpc_cred_cache *cache = auth->au_credcache; |
421 | |
422 | if (cache) { |
423 | auth->au_credcache = NULL; |
424 | rpcauth_clear_credcache(cache); |
425 | kfree(cache->hashtable); |
426 | kfree(cache); |
427 | } |
428 | } |
429 | EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache); |
430 | |
431 | |
432 | #define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ) |
433 | |
434 | /* |
435 | * Remove stale credentials. Avoid sleeping inside the loop. |
436 | */ |
437 | static long |
438 | rpcauth_prune_expired(struct list_head *free, int nr_to_scan) |
439 | { |
440 | spinlock_t *cache_lock; |
441 | struct rpc_cred *cred, *next; |
442 | unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM; |
443 | long freed = 0; |
444 | |
445 | list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) { |
446 | |
447 | if (nr_to_scan-- == 0) |
448 | break; |
449 | /* |
450 | * Enforce a 60 second garbage collection moratorium |
451 | * Note that the cred_unused list must be time-ordered. |
452 | */ |
453 | if (time_in_range(cred->cr_expire, expired, jiffies) && |
454 | test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) |
455 | break; |
456 | |
457 | list_del_init(&cred->cr_lru); |
458 | number_cred_unused--; |
459 | freed++; |
460 | if (atomic_read(&cred->cr_count) != 0) |
461 | continue; |
462 | |
463 | cache_lock = &cred->cr_auth->au_credcache->lock; |
464 | spin_lock(cache_lock); |
465 | if (atomic_read(&cred->cr_count) == 0) { |
466 | get_rpccred(cred); |
467 | list_add_tail(&cred->cr_lru, free); |
468 | rpcauth_unhash_cred_locked(cred); |
469 | } |
470 | spin_unlock(cache_lock); |
471 | } |
472 | return freed; |
473 | } |
474 | |
475 | /* |
476 | * Run memory cache shrinker. |
477 | */ |
478 | static unsigned long |
479 | rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) |
480 | |
481 | { |
482 | LIST_HEAD(free); |
483 | unsigned long freed; |
484 | |
485 | if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
486 | return SHRINK_STOP; |
487 | |
488 | /* nothing left, don't come back */ |
489 | if (list_empty(&cred_unused)) |
490 | return SHRINK_STOP; |
491 | |
492 | spin_lock(&rpc_credcache_lock); |
493 | freed = rpcauth_prune_expired(&free, sc->nr_to_scan); |
494 | spin_unlock(&rpc_credcache_lock); |
495 | rpcauth_destroy_credlist(&free); |
496 | |
497 | return freed; |
498 | } |
499 | |
500 | static unsigned long |
501 | rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) |
502 | |
503 | { |
504 | return (number_cred_unused / 100) * sysctl_vfs_cache_pressure; |
505 | } |
506 | |
507 | /* |
508 | * Look up a process' credentials in the authentication cache |
509 | */ |
510 | struct rpc_cred * |
511 | rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred, |
512 | int flags) |
513 | { |
514 | LIST_HEAD(free); |
515 | struct rpc_cred_cache *cache = auth->au_credcache; |
516 | struct rpc_cred *cred = NULL, |
517 | *entry, *new; |
518 | unsigned int nr; |
519 | |
520 | nr = hash_long(from_kuid(&init_user_ns, acred->uid), cache->hashbits); |
521 | |
522 | rcu_read_lock(); |
523 | hlist_for_each_entry_rcu(entry, &cache->hashtable[nr], cr_hash) { |
524 | if (!entry->cr_ops->crmatch(acred, entry, flags)) |
525 | continue; |
526 | spin_lock(&cache->lock); |
527 | if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) { |
528 | spin_unlock(&cache->lock); |
529 | continue; |
530 | } |
531 | cred = get_rpccred(entry); |
532 | spin_unlock(&cache->lock); |
533 | break; |
534 | } |
535 | rcu_read_unlock(); |
536 | |
537 | if (cred != NULL) |
538 | goto found; |
539 | |
540 | new = auth->au_ops->crcreate(auth, acred, flags); |
541 | if (IS_ERR(new)) { |
542 | cred = new; |
543 | goto out; |
544 | } |
545 | |
546 | spin_lock(&cache->lock); |
547 | hlist_for_each_entry(entry, &cache->hashtable[nr], cr_hash) { |
548 | if (!entry->cr_ops->crmatch(acred, entry, flags)) |
549 | continue; |
550 | cred = get_rpccred(entry); |
551 | break; |
552 | } |
553 | if (cred == NULL) { |
554 | cred = new; |
555 | set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags); |
556 | hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]); |
557 | } else |
558 | list_add_tail(&new->cr_lru, &free); |
559 | spin_unlock(&cache->lock); |
560 | found: |
561 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
562 | cred->cr_ops->cr_init != NULL && |
563 | !(flags & RPCAUTH_LOOKUP_NEW)) { |
564 | int res = cred->cr_ops->cr_init(auth, cred); |
565 | if (res < 0) { |
566 | put_rpccred(cred); |
567 | cred = ERR_PTR(res); |
568 | } |
569 | } |
570 | rpcauth_destroy_credlist(&free); |
571 | out: |
572 | return cred; |
573 | } |
574 | EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache); |
575 | |
576 | struct rpc_cred * |
577 | rpcauth_lookupcred(struct rpc_auth *auth, int flags) |
578 | { |
579 | struct auth_cred acred; |
580 | struct rpc_cred *ret; |
581 | const struct cred *cred = current_cred(); |
582 | |
583 | dprintk("RPC: looking up %s cred\n", |
584 | auth->au_ops->au_name); |
585 | |
586 | memset(&acred, 0, sizeof(acred)); |
587 | acred.uid = cred->fsuid; |
588 | acred.gid = cred->fsgid; |
589 | acred.group_info = get_group_info(((struct cred *)cred)->group_info); |
590 | |
591 | ret = auth->au_ops->lookup_cred(auth, &acred, flags); |
592 | put_group_info(acred.group_info); |
593 | return ret; |
594 | } |
595 | |
596 | void |
597 | rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred, |
598 | struct rpc_auth *auth, const struct rpc_credops *ops) |
599 | { |
600 | INIT_HLIST_NODE(&cred->cr_hash); |
601 | INIT_LIST_HEAD(&cred->cr_lru); |
602 | atomic_set(&cred->cr_count, 1); |
603 | cred->cr_auth = auth; |
604 | cred->cr_ops = ops; |
605 | cred->cr_expire = jiffies; |
606 | #ifdef RPC_DEBUG |
607 | cred->cr_magic = RPCAUTH_CRED_MAGIC; |
608 | #endif |
609 | cred->cr_uid = acred->uid; |
610 | } |
611 | EXPORT_SYMBOL_GPL(rpcauth_init_cred); |
612 | |
613 | struct rpc_cred * |
614 | rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred, int lookupflags) |
615 | { |
616 | dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid, |
617 | cred->cr_auth->au_ops->au_name, cred); |
618 | return get_rpccred(cred); |
619 | } |
620 | EXPORT_SYMBOL_GPL(rpcauth_generic_bind_cred); |
621 | |
622 | static struct rpc_cred * |
623 | rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags) |
624 | { |
625 | struct rpc_auth *auth = task->tk_client->cl_auth; |
626 | struct auth_cred acred = { |
627 | .uid = GLOBAL_ROOT_UID, |
628 | .gid = GLOBAL_ROOT_GID, |
629 | }; |
630 | |
631 | dprintk("RPC: %5u looking up %s cred\n", |
632 | task->tk_pid, task->tk_client->cl_auth->au_ops->au_name); |
633 | return auth->au_ops->lookup_cred(auth, &acred, lookupflags); |
634 | } |
635 | |
636 | static struct rpc_cred * |
637 | rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags) |
638 | { |
639 | struct rpc_auth *auth = task->tk_client->cl_auth; |
640 | |
641 | dprintk("RPC: %5u looking up %s cred\n", |
642 | task->tk_pid, auth->au_ops->au_name); |
643 | return rpcauth_lookupcred(auth, lookupflags); |
644 | } |
645 | |
646 | static int |
647 | rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags) |
648 | { |
649 | struct rpc_rqst *req = task->tk_rqstp; |
650 | struct rpc_cred *new; |
651 | int lookupflags = 0; |
652 | |
653 | if (flags & RPC_TASK_ASYNC) |
654 | lookupflags |= RPCAUTH_LOOKUP_NEW; |
655 | if (cred != NULL) |
656 | new = cred->cr_ops->crbind(task, cred, lookupflags); |
657 | else if (flags & RPC_TASK_ROOTCREDS) |
658 | new = rpcauth_bind_root_cred(task, lookupflags); |
659 | else |
660 | new = rpcauth_bind_new_cred(task, lookupflags); |
661 | if (IS_ERR(new)) |
662 | return PTR_ERR(new); |
663 | if (req->rq_cred != NULL) |
664 | put_rpccred(req->rq_cred); |
665 | req->rq_cred = new; |
666 | return 0; |
667 | } |
668 | |
669 | void |
670 | put_rpccred(struct rpc_cred *cred) |
671 | { |
672 | /* Fast path for unhashed credentials */ |
673 | if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) { |
674 | if (atomic_dec_and_test(&cred->cr_count)) |
675 | cred->cr_ops->crdestroy(cred); |
676 | return; |
677 | } |
678 | |
679 | if (!atomic_dec_and_lock(&cred->cr_count, &rpc_credcache_lock)) |
680 | return; |
681 | if (!list_empty(&cred->cr_lru)) { |
682 | number_cred_unused--; |
683 | list_del_init(&cred->cr_lru); |
684 | } |
685 | if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) { |
686 | if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) { |
687 | cred->cr_expire = jiffies; |
688 | list_add_tail(&cred->cr_lru, &cred_unused); |
689 | number_cred_unused++; |
690 | goto out_nodestroy; |
691 | } |
692 | if (!rpcauth_unhash_cred(cred)) { |
693 | /* We were hashed and someone looked us up... */ |
694 | goto out_nodestroy; |
695 | } |
696 | } |
697 | spin_unlock(&rpc_credcache_lock); |
698 | cred->cr_ops->crdestroy(cred); |
699 | return; |
700 | out_nodestroy: |
701 | spin_unlock(&rpc_credcache_lock); |
702 | } |
703 | EXPORT_SYMBOL_GPL(put_rpccred); |
704 | |
705 | __be32 * |
706 | rpcauth_marshcred(struct rpc_task *task, __be32 *p) |
707 | { |
708 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
709 | |
710 | dprintk("RPC: %5u marshaling %s cred %p\n", |
711 | task->tk_pid, cred->cr_auth->au_ops->au_name, cred); |
712 | |
713 | return cred->cr_ops->crmarshal(task, p); |
714 | } |
715 | |
716 | __be32 * |
717 | rpcauth_checkverf(struct rpc_task *task, __be32 *p) |
718 | { |
719 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
720 | |
721 | dprintk("RPC: %5u validating %s cred %p\n", |
722 | task->tk_pid, cred->cr_auth->au_ops->au_name, cred); |
723 | |
724 | return cred->cr_ops->crvalidate(task, p); |
725 | } |
726 | |
727 | static void rpcauth_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp, |
728 | __be32 *data, void *obj) |
729 | { |
730 | struct xdr_stream xdr; |
731 | |
732 | xdr_init_encode(&xdr, &rqstp->rq_snd_buf, data); |
733 | encode(rqstp, &xdr, obj); |
734 | } |
735 | |
736 | int |
737 | rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp, |
738 | __be32 *data, void *obj) |
739 | { |
740 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
741 | |
742 | dprintk("RPC: %5u using %s cred %p to wrap rpc data\n", |
743 | task->tk_pid, cred->cr_ops->cr_name, cred); |
744 | if (cred->cr_ops->crwrap_req) |
745 | return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj); |
746 | /* By default, we encode the arguments normally. */ |
747 | rpcauth_wrap_req_encode(encode, rqstp, data, obj); |
748 | return 0; |
749 | } |
750 | |
751 | static int |
752 | rpcauth_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp, |
753 | __be32 *data, void *obj) |
754 | { |
755 | struct xdr_stream xdr; |
756 | |
757 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, data); |
758 | return decode(rqstp, &xdr, obj); |
759 | } |
760 | |
761 | int |
762 | rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp, |
763 | __be32 *data, void *obj) |
764 | { |
765 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
766 | |
767 | dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n", |
768 | task->tk_pid, cred->cr_ops->cr_name, cred); |
769 | if (cred->cr_ops->crunwrap_resp) |
770 | return cred->cr_ops->crunwrap_resp(task, decode, rqstp, |
771 | data, obj); |
772 | /* By default, we decode the arguments normally. */ |
773 | return rpcauth_unwrap_req_decode(decode, rqstp, data, obj); |
774 | } |
775 | |
776 | int |
777 | rpcauth_refreshcred(struct rpc_task *task) |
778 | { |
779 | struct rpc_cred *cred; |
780 | int err; |
781 | |
782 | cred = task->tk_rqstp->rq_cred; |
783 | if (cred == NULL) { |
784 | err = rpcauth_bindcred(task, task->tk_msg.rpc_cred, task->tk_flags); |
785 | if (err < 0) |
786 | goto out; |
787 | cred = task->tk_rqstp->rq_cred; |
788 | } |
789 | dprintk("RPC: %5u refreshing %s cred %p\n", |
790 | task->tk_pid, cred->cr_auth->au_ops->au_name, cred); |
791 | |
792 | err = cred->cr_ops->crrefresh(task); |
793 | out: |
794 | if (err < 0) |
795 | task->tk_status = err; |
796 | return err; |
797 | } |
798 | |
799 | void |
800 | rpcauth_invalcred(struct rpc_task *task) |
801 | { |
802 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
803 | |
804 | dprintk("RPC: %5u invalidating %s cred %p\n", |
805 | task->tk_pid, cred->cr_auth->au_ops->au_name, cred); |
806 | if (cred) |
807 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
808 | } |
809 | |
810 | int |
811 | rpcauth_uptodatecred(struct rpc_task *task) |
812 | { |
813 | struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
814 | |
815 | return cred == NULL || |
816 | test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0; |
817 | } |
818 | |
819 | static struct shrinker rpc_cred_shrinker = { |
820 | .count_objects = rpcauth_cache_shrink_count, |
821 | .scan_objects = rpcauth_cache_shrink_scan, |
822 | .seeks = DEFAULT_SEEKS, |
823 | }; |
824 | |
825 | int __init rpcauth_init_module(void) |
826 | { |
827 | int err; |
828 | |
829 | err = rpc_init_authunix(); |
830 | if (err < 0) |
831 | goto out1; |
832 | err = rpc_init_generic_auth(); |
833 | if (err < 0) |
834 | goto out2; |
835 | register_shrinker(&rpc_cred_shrinker); |
836 | return 0; |
837 | out2: |
838 | rpc_destroy_authunix(); |
839 | out1: |
840 | return err; |
841 | } |
842 | |
843 | void rpcauth_remove_module(void) |
844 | { |
845 | rpc_destroy_authunix(); |
846 | rpc_destroy_generic_auth(); |
847 | unregister_shrinker(&rpc_cred_shrinker); |
848 | } |
849 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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