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Linux/net/sunrpc/auth.c

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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 #if IS_ENABLED(CONFIG_SUNRPC_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 = kstrtoul(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 const 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 unsigned long auth_max_cred_cachesize = ULONG_MAX;
 84 module_param(auth_max_cred_cachesize, ulong, 0644);
 85 MODULE_PARM_DESC(auth_max_cred_cachesize, "RPC credential maximum total cache size");
 86 
 87 static u32
 88 pseudoflavor_to_flavor(u32 flavor) {
 89         if (flavor > RPC_AUTH_MAXFLAVOR)
 90                 return RPC_AUTH_GSS;
 91         return flavor;
 92 }
 93 
 94 int
 95 rpcauth_register(const struct rpc_authops *ops)
 96 {
 97         rpc_authflavor_t flavor;
 98         int ret = -EPERM;
 99 
100         if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
101                 return -EINVAL;
102         spin_lock(&rpc_authflavor_lock);
103         if (auth_flavors[flavor] == NULL) {
104                 auth_flavors[flavor] = ops;
105                 ret = 0;
106         }
107         spin_unlock(&rpc_authflavor_lock);
108         return ret;
109 }
110 EXPORT_SYMBOL_GPL(rpcauth_register);
111 
112 int
113 rpcauth_unregister(const struct rpc_authops *ops)
114 {
115         rpc_authflavor_t flavor;
116         int ret = -EPERM;
117 
118         if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
119                 return -EINVAL;
120         spin_lock(&rpc_authflavor_lock);
121         if (auth_flavors[flavor] == ops) {
122                 auth_flavors[flavor] = NULL;
123                 ret = 0;
124         }
125         spin_unlock(&rpc_authflavor_lock);
126         return ret;
127 }
128 EXPORT_SYMBOL_GPL(rpcauth_unregister);
129 
130 /**
131  * rpcauth_get_pseudoflavor - check if security flavor is supported
132  * @flavor: a security flavor
133  * @info: a GSS mech OID, quality of protection, and service value
134  *
135  * Verifies that an appropriate kernel module is available or already loaded.
136  * Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is
137  * not supported locally.
138  */
139 rpc_authflavor_t
140 rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info)
141 {
142         const struct rpc_authops *ops;
143         rpc_authflavor_t pseudoflavor;
144 
145         ops = auth_flavors[flavor];
146         if (ops == NULL)
147                 request_module("rpc-auth-%u", flavor);
148         spin_lock(&rpc_authflavor_lock);
149         ops = auth_flavors[flavor];
150         if (ops == NULL || !try_module_get(ops->owner)) {
151                 spin_unlock(&rpc_authflavor_lock);
152                 return RPC_AUTH_MAXFLAVOR;
153         }
154         spin_unlock(&rpc_authflavor_lock);
155 
156         pseudoflavor = flavor;
157         if (ops->info2flavor != NULL)
158                 pseudoflavor = ops->info2flavor(info);
159 
160         module_put(ops->owner);
161         return pseudoflavor;
162 }
163 EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor);
164 
165 /**
166  * rpcauth_get_gssinfo - find GSS tuple matching a GSS pseudoflavor
167  * @pseudoflavor: GSS pseudoflavor to match
168  * @info: rpcsec_gss_info structure to fill in
169  *
170  * Returns zero and fills in "info" if pseudoflavor matches a
171  * supported mechanism.
172  */
173 int
174 rpcauth_get_gssinfo(rpc_authflavor_t pseudoflavor, struct rpcsec_gss_info *info)
175 {
176         rpc_authflavor_t flavor = pseudoflavor_to_flavor(pseudoflavor);
177         const struct rpc_authops *ops;
178         int result;
179 
180         if (flavor >= RPC_AUTH_MAXFLAVOR)
181                 return -EINVAL;
182 
183         ops = auth_flavors[flavor];
184         if (ops == NULL)
185                 request_module("rpc-auth-%u", flavor);
186         spin_lock(&rpc_authflavor_lock);
187         ops = auth_flavors[flavor];
188         if (ops == NULL || !try_module_get(ops->owner)) {
189                 spin_unlock(&rpc_authflavor_lock);
190                 return -ENOENT;
191         }
192         spin_unlock(&rpc_authflavor_lock);
193 
194         result = -ENOENT;
195         if (ops->flavor2info != NULL)
196                 result = ops->flavor2info(pseudoflavor, info);
197 
198         module_put(ops->owner);
199         return result;
200 }
201 EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo);
202 
203 /**
204  * rpcauth_list_flavors - discover registered flavors and pseudoflavors
205  * @array: array to fill in
206  * @size: size of "array"
207  *
208  * Returns the number of array items filled in, or a negative errno.
209  *
210  * The returned array is not sorted by any policy.  Callers should not
211  * rely on the order of the items in the returned array.
212  */
213 int
214 rpcauth_list_flavors(rpc_authflavor_t *array, int size)
215 {
216         rpc_authflavor_t flavor;
217         int result = 0;
218 
219         spin_lock(&rpc_authflavor_lock);
220         for (flavor = 0; flavor < RPC_AUTH_MAXFLAVOR; flavor++) {
221                 const struct rpc_authops *ops = auth_flavors[flavor];
222                 rpc_authflavor_t pseudos[4];
223                 int i, len;
224 
225                 if (result >= size) {
226                         result = -ENOMEM;
227                         break;
228                 }
229 
230                 if (ops == NULL)
231                         continue;
232                 if (ops->list_pseudoflavors == NULL) {
233                         array[result++] = ops->au_flavor;
234                         continue;
235                 }
236                 len = ops->list_pseudoflavors(pseudos, ARRAY_SIZE(pseudos));
237                 if (len < 0) {
238                         result = len;
239                         break;
240                 }
241                 for (i = 0; i < len; i++) {
242                         if (result >= size) {
243                                 result = -ENOMEM;
244                                 break;
245                         }
246                         array[result++] = pseudos[i];
247                 }
248         }
249         spin_unlock(&rpc_authflavor_lock);
250 
251         dprintk("RPC:       %s returns %d\n", __func__, result);
252         return result;
253 }
254 EXPORT_SYMBOL_GPL(rpcauth_list_flavors);
255 
256 struct rpc_auth *
257 rpcauth_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
258 {
259         struct rpc_auth         *auth;
260         const struct rpc_authops *ops;
261         u32                     flavor = pseudoflavor_to_flavor(args->pseudoflavor);
262 
263         auth = ERR_PTR(-EINVAL);
264         if (flavor >= RPC_AUTH_MAXFLAVOR)
265                 goto out;
266 
267         if ((ops = auth_flavors[flavor]) == NULL)
268                 request_module("rpc-auth-%u", flavor);
269         spin_lock(&rpc_authflavor_lock);
270         ops = auth_flavors[flavor];
271         if (ops == NULL || !try_module_get(ops->owner)) {
272                 spin_unlock(&rpc_authflavor_lock);
273                 goto out;
274         }
275         spin_unlock(&rpc_authflavor_lock);
276         auth = ops->create(args, clnt);
277         module_put(ops->owner);
278         if (IS_ERR(auth))
279                 return auth;
280         if (clnt->cl_auth)
281                 rpcauth_release(clnt->cl_auth);
282         clnt->cl_auth = auth;
283 
284 out:
285         return auth;
286 }
287 EXPORT_SYMBOL_GPL(rpcauth_create);
288 
289 void
290 rpcauth_release(struct rpc_auth *auth)
291 {
292         if (!atomic_dec_and_test(&auth->au_count))
293                 return;
294         auth->au_ops->destroy(auth);
295 }
296 
297 static DEFINE_SPINLOCK(rpc_credcache_lock);
298 
299 static void
300 rpcauth_unhash_cred_locked(struct rpc_cred *cred)
301 {
302         hlist_del_rcu(&cred->cr_hash);
303         smp_mb__before_atomic();
304         clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
305 }
306 
307 static int
308 rpcauth_unhash_cred(struct rpc_cred *cred)
309 {
310         spinlock_t *cache_lock;
311         int ret;
312 
313         cache_lock = &cred->cr_auth->au_credcache->lock;
314         spin_lock(cache_lock);
315         ret = atomic_read(&cred->cr_count) == 0;
316         if (ret)
317                 rpcauth_unhash_cred_locked(cred);
318         spin_unlock(cache_lock);
319         return ret;
320 }
321 
322 /*
323  * Initialize RPC credential cache
324  */
325 int
326 rpcauth_init_credcache(struct rpc_auth *auth)
327 {
328         struct rpc_cred_cache *new;
329         unsigned int hashsize;
330 
331         new = kmalloc(sizeof(*new), GFP_KERNEL);
332         if (!new)
333                 goto out_nocache;
334         new->hashbits = auth_hashbits;
335         hashsize = 1U << new->hashbits;
336         new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL);
337         if (!new->hashtable)
338                 goto out_nohashtbl;
339         spin_lock_init(&new->lock);
340         auth->au_credcache = new;
341         return 0;
342 out_nohashtbl:
343         kfree(new);
344 out_nocache:
345         return -ENOMEM;
346 }
347 EXPORT_SYMBOL_GPL(rpcauth_init_credcache);
348 
349 /*
350  * Setup a credential key lifetime timeout notification
351  */
352 int
353 rpcauth_key_timeout_notify(struct rpc_auth *auth, struct rpc_cred *cred)
354 {
355         if (!cred->cr_auth->au_ops->key_timeout)
356                 return 0;
357         return cred->cr_auth->au_ops->key_timeout(auth, cred);
358 }
359 EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify);
360 
361 bool
362 rpcauth_cred_key_to_expire(struct rpc_cred *cred)
363 {
364         if (!cred->cr_ops->crkey_to_expire)
365                 return false;
366         return cred->cr_ops->crkey_to_expire(cred);
367 }
368 EXPORT_SYMBOL_GPL(rpcauth_cred_key_to_expire);
369 
370 char *
371 rpcauth_stringify_acceptor(struct rpc_cred *cred)
372 {
373         if (!cred->cr_ops->crstringify_acceptor)
374                 return NULL;
375         return cred->cr_ops->crstringify_acceptor(cred);
376 }
377 EXPORT_SYMBOL_GPL(rpcauth_stringify_acceptor);
378 
379 /*
380  * Destroy a list of credentials
381  */
382 static inline
383 void rpcauth_destroy_credlist(struct list_head *head)
384 {
385         struct rpc_cred *cred;
386 
387         while (!list_empty(head)) {
388                 cred = list_entry(head->next, struct rpc_cred, cr_lru);
389                 list_del_init(&cred->cr_lru);
390                 put_rpccred(cred);
391         }
392 }
393 
394 /*
395  * Clear the RPC credential cache, and delete those credentials
396  * that are not referenced.
397  */
398 void
399 rpcauth_clear_credcache(struct rpc_cred_cache *cache)
400 {
401         LIST_HEAD(free);
402         struct hlist_head *head;
403         struct rpc_cred *cred;
404         unsigned int hashsize = 1U << cache->hashbits;
405         int             i;
406 
407         spin_lock(&rpc_credcache_lock);
408         spin_lock(&cache->lock);
409         for (i = 0; i < hashsize; i++) {
410                 head = &cache->hashtable[i];
411                 while (!hlist_empty(head)) {
412                         cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
413                         get_rpccred(cred);
414                         if (!list_empty(&cred->cr_lru)) {
415                                 list_del(&cred->cr_lru);
416                                 number_cred_unused--;
417                         }
418                         list_add_tail(&cred->cr_lru, &free);
419                         rpcauth_unhash_cred_locked(cred);
420                 }
421         }
422         spin_unlock(&cache->lock);
423         spin_unlock(&rpc_credcache_lock);
424         rpcauth_destroy_credlist(&free);
425 }
426 
427 /*
428  * Destroy the RPC credential cache
429  */
430 void
431 rpcauth_destroy_credcache(struct rpc_auth *auth)
432 {
433         struct rpc_cred_cache *cache = auth->au_credcache;
434 
435         if (cache) {
436                 auth->au_credcache = NULL;
437                 rpcauth_clear_credcache(cache);
438                 kfree(cache->hashtable);
439                 kfree(cache);
440         }
441 }
442 EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache);
443 
444 
445 #define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ)
446 
447 /*
448  * Remove stale credentials. Avoid sleeping inside the loop.
449  */
450 static long
451 rpcauth_prune_expired(struct list_head *free, int nr_to_scan)
452 {
453         spinlock_t *cache_lock;
454         struct rpc_cred *cred, *next;
455         unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM;
456         long freed = 0;
457 
458         list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) {
459 
460                 if (nr_to_scan-- == 0)
461                         break;
462                 /*
463                  * Enforce a 60 second garbage collection moratorium
464                  * Note that the cred_unused list must be time-ordered.
465                  */
466                 if (time_in_range(cred->cr_expire, expired, jiffies) &&
467                     test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0)
468                         break;
469 
470                 list_del_init(&cred->cr_lru);
471                 number_cred_unused--;
472                 freed++;
473                 if (atomic_read(&cred->cr_count) != 0)
474                         continue;
475 
476                 cache_lock = &cred->cr_auth->au_credcache->lock;
477                 spin_lock(cache_lock);
478                 if (atomic_read(&cred->cr_count) == 0) {
479                         get_rpccred(cred);
480                         list_add_tail(&cred->cr_lru, free);
481                         rpcauth_unhash_cred_locked(cred);
482                 }
483                 spin_unlock(cache_lock);
484         }
485         return freed;
486 }
487 
488 static unsigned long
489 rpcauth_cache_do_shrink(int nr_to_scan)
490 {
491         LIST_HEAD(free);
492         unsigned long freed;
493 
494         spin_lock(&rpc_credcache_lock);
495         freed = rpcauth_prune_expired(&free, nr_to_scan);
496         spin_unlock(&rpc_credcache_lock);
497         rpcauth_destroy_credlist(&free);
498 
499         return freed;
500 }
501 
502 /*
503  * Run memory cache shrinker.
504  */
505 static unsigned long
506 rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc)
507 
508 {
509         if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL)
510                 return SHRINK_STOP;
511 
512         /* nothing left, don't come back */
513         if (list_empty(&cred_unused))
514                 return SHRINK_STOP;
515 
516         return rpcauth_cache_do_shrink(sc->nr_to_scan);
517 }
518 
519 static unsigned long
520 rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
521 
522 {
523         return (number_cred_unused / 100) * sysctl_vfs_cache_pressure;
524 }
525 
526 static void
527 rpcauth_cache_enforce_limit(void)
528 {
529         unsigned long diff;
530         unsigned int nr_to_scan;
531 
532         if (number_cred_unused <= auth_max_cred_cachesize)
533                 return;
534         diff = number_cred_unused - auth_max_cred_cachesize;
535         nr_to_scan = 100;
536         if (diff < nr_to_scan)
537                 nr_to_scan = diff;
538         rpcauth_cache_do_shrink(nr_to_scan);
539 }
540 
541 /*
542  * Look up a process' credentials in the authentication cache
543  */
544 struct rpc_cred *
545 rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
546                 int flags)
547 {
548         LIST_HEAD(free);
549         struct rpc_cred_cache *cache = auth->au_credcache;
550         struct rpc_cred *cred = NULL,
551                         *entry, *new;
552         unsigned int nr;
553 
554         nr = hash_long(from_kuid(&init_user_ns, acred->uid), cache->hashbits);
555 
556         rcu_read_lock();
557         hlist_for_each_entry_rcu(entry, &cache->hashtable[nr], cr_hash) {
558                 if (!entry->cr_ops->crmatch(acred, entry, flags))
559                         continue;
560                 if (flags & RPCAUTH_LOOKUP_RCU) {
561                         if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) &&
562                             !test_bit(RPCAUTH_CRED_NEW, &entry->cr_flags))
563                                 cred = entry;
564                         break;
565                 }
566                 spin_lock(&cache->lock);
567                 if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) {
568                         spin_unlock(&cache->lock);
569                         continue;
570                 }
571                 cred = get_rpccred(entry);
572                 spin_unlock(&cache->lock);
573                 break;
574         }
575         rcu_read_unlock();
576 
577         if (cred != NULL)
578                 goto found;
579 
580         if (flags & RPCAUTH_LOOKUP_RCU)
581                 return ERR_PTR(-ECHILD);
582 
583         new = auth->au_ops->crcreate(auth, acred, flags);
584         if (IS_ERR(new)) {
585                 cred = new;
586                 goto out;
587         }
588 
589         spin_lock(&cache->lock);
590         hlist_for_each_entry(entry, &cache->hashtable[nr], cr_hash) {
591                 if (!entry->cr_ops->crmatch(acred, entry, flags))
592                         continue;
593                 cred = get_rpccred(entry);
594                 break;
595         }
596         if (cred == NULL) {
597                 cred = new;
598                 set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags);
599                 hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]);
600         } else
601                 list_add_tail(&new->cr_lru, &free);
602         spin_unlock(&cache->lock);
603         rpcauth_cache_enforce_limit();
604 found:
605         if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) &&
606             cred->cr_ops->cr_init != NULL &&
607             !(flags & RPCAUTH_LOOKUP_NEW)) {
608                 int res = cred->cr_ops->cr_init(auth, cred);
609                 if (res < 0) {
610                         put_rpccred(cred);
611                         cred = ERR_PTR(res);
612                 }
613         }
614         rpcauth_destroy_credlist(&free);
615 out:
616         return cred;
617 }
618 EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache);
619 
620 struct rpc_cred *
621 rpcauth_lookupcred(struct rpc_auth *auth, int flags)
622 {
623         struct auth_cred acred;
624         struct rpc_cred *ret;
625         const struct cred *cred = current_cred();
626 
627         dprintk("RPC:       looking up %s cred\n",
628                 auth->au_ops->au_name);
629 
630         memset(&acred, 0, sizeof(acred));
631         acred.uid = cred->fsuid;
632         acred.gid = cred->fsgid;
633         acred.group_info = cred->group_info;
634         ret = auth->au_ops->lookup_cred(auth, &acred, flags);
635         return ret;
636 }
637 EXPORT_SYMBOL_GPL(rpcauth_lookupcred);
638 
639 void
640 rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred,
641                   struct rpc_auth *auth, const struct rpc_credops *ops)
642 {
643         INIT_HLIST_NODE(&cred->cr_hash);
644         INIT_LIST_HEAD(&cred->cr_lru);
645         atomic_set(&cred->cr_count, 1);
646         cred->cr_auth = auth;
647         cred->cr_ops = ops;
648         cred->cr_expire = jiffies;
649 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
650         cred->cr_magic = RPCAUTH_CRED_MAGIC;
651 #endif
652         cred->cr_uid = acred->uid;
653 }
654 EXPORT_SYMBOL_GPL(rpcauth_init_cred);
655 
656 struct rpc_cred *
657 rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred, int lookupflags)
658 {
659         dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid,
660                         cred->cr_auth->au_ops->au_name, cred);
661         return get_rpccred(cred);
662 }
663 EXPORT_SYMBOL_GPL(rpcauth_generic_bind_cred);
664 
665 static struct rpc_cred *
666 rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags)
667 {
668         struct rpc_auth *auth = task->tk_client->cl_auth;
669         struct auth_cred acred = {
670                 .uid = GLOBAL_ROOT_UID,
671                 .gid = GLOBAL_ROOT_GID,
672         };
673 
674         dprintk("RPC: %5u looking up %s cred\n",
675                 task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
676         return auth->au_ops->lookup_cred(auth, &acred, lookupflags);
677 }
678 
679 static struct rpc_cred *
680 rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags)
681 {
682         struct rpc_auth *auth = task->tk_client->cl_auth;
683 
684         dprintk("RPC: %5u looking up %s cred\n",
685                 task->tk_pid, auth->au_ops->au_name);
686         return rpcauth_lookupcred(auth, lookupflags);
687 }
688 
689 static int
690 rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags)
691 {
692         struct rpc_rqst *req = task->tk_rqstp;
693         struct rpc_cred *new;
694         int lookupflags = 0;
695 
696         if (flags & RPC_TASK_ASYNC)
697                 lookupflags |= RPCAUTH_LOOKUP_NEW;
698         if (cred != NULL)
699                 new = cred->cr_ops->crbind(task, cred, lookupflags);
700         else if (flags & RPC_TASK_ROOTCREDS)
701                 new = rpcauth_bind_root_cred(task, lookupflags);
702         else
703                 new = rpcauth_bind_new_cred(task, lookupflags);
704         if (IS_ERR(new))
705                 return PTR_ERR(new);
706         if (req->rq_cred != NULL)
707                 put_rpccred(req->rq_cred);
708         req->rq_cred = new;
709         return 0;
710 }
711 
712 void
713 put_rpccred(struct rpc_cred *cred)
714 {
715         /* Fast path for unhashed credentials */
716         if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) {
717                 if (atomic_dec_and_test(&cred->cr_count))
718                         cred->cr_ops->crdestroy(cred);
719                 return;
720         }
721 
722         if (!atomic_dec_and_lock(&cred->cr_count, &rpc_credcache_lock))
723                 return;
724         if (!list_empty(&cred->cr_lru)) {
725                 number_cred_unused--;
726                 list_del_init(&cred->cr_lru);
727         }
728         if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) {
729                 if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) {
730                         cred->cr_expire = jiffies;
731                         list_add_tail(&cred->cr_lru, &cred_unused);
732                         number_cred_unused++;
733                         goto out_nodestroy;
734                 }
735                 if (!rpcauth_unhash_cred(cred)) {
736                         /* We were hashed and someone looked us up... */
737                         goto out_nodestroy;
738                 }
739         }
740         spin_unlock(&rpc_credcache_lock);
741         cred->cr_ops->crdestroy(cred);
742         return;
743 out_nodestroy:
744         spin_unlock(&rpc_credcache_lock);
745 }
746 EXPORT_SYMBOL_GPL(put_rpccred);
747 
748 __be32 *
749 rpcauth_marshcred(struct rpc_task *task, __be32 *p)
750 {
751         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
752 
753         dprintk("RPC: %5u marshaling %s cred %p\n",
754                 task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
755 
756         return cred->cr_ops->crmarshal(task, p);
757 }
758 
759 __be32 *
760 rpcauth_checkverf(struct rpc_task *task, __be32 *p)
761 {
762         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
763 
764         dprintk("RPC: %5u validating %s cred %p\n",
765                 task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
766 
767         return cred->cr_ops->crvalidate(task, p);
768 }
769 
770 static void rpcauth_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
771                                    __be32 *data, void *obj)
772 {
773         struct xdr_stream xdr;
774 
775         xdr_init_encode(&xdr, &rqstp->rq_snd_buf, data);
776         encode(rqstp, &xdr, obj);
777 }
778 
779 int
780 rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp,
781                 __be32 *data, void *obj)
782 {
783         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
784 
785         dprintk("RPC: %5u using %s cred %p to wrap rpc data\n",
786                         task->tk_pid, cred->cr_ops->cr_name, cred);
787         if (cred->cr_ops->crwrap_req)
788                 return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
789         /* By default, we encode the arguments normally. */
790         rpcauth_wrap_req_encode(encode, rqstp, data, obj);
791         return 0;
792 }
793 
794 static int
795 rpcauth_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
796                           __be32 *data, void *obj)
797 {
798         struct xdr_stream xdr;
799 
800         xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, data);
801         return decode(rqstp, &xdr, obj);
802 }
803 
804 int
805 rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp,
806                 __be32 *data, void *obj)
807 {
808         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
809 
810         dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n",
811                         task->tk_pid, cred->cr_ops->cr_name, cred);
812         if (cred->cr_ops->crunwrap_resp)
813                 return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
814                                                    data, obj);
815         /* By default, we decode the arguments normally. */
816         return rpcauth_unwrap_req_decode(decode, rqstp, data, obj);
817 }
818 
819 int
820 rpcauth_refreshcred(struct rpc_task *task)
821 {
822         struct rpc_cred *cred;
823         int err;
824 
825         cred = task->tk_rqstp->rq_cred;
826         if (cred == NULL) {
827                 err = rpcauth_bindcred(task, task->tk_msg.rpc_cred, task->tk_flags);
828                 if (err < 0)
829                         goto out;
830                 cred = task->tk_rqstp->rq_cred;
831         }
832         dprintk("RPC: %5u refreshing %s cred %p\n",
833                 task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
834 
835         err = cred->cr_ops->crrefresh(task);
836 out:
837         if (err < 0)
838                 task->tk_status = err;
839         return err;
840 }
841 
842 void
843 rpcauth_invalcred(struct rpc_task *task)
844 {
845         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
846 
847         dprintk("RPC: %5u invalidating %s cred %p\n",
848                 task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
849         if (cred)
850                 clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags);
851 }
852 
853 int
854 rpcauth_uptodatecred(struct rpc_task *task)
855 {
856         struct rpc_cred *cred = task->tk_rqstp->rq_cred;
857 
858         return cred == NULL ||
859                 test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0;
860 }
861 
862 static struct shrinker rpc_cred_shrinker = {
863         .count_objects = rpcauth_cache_shrink_count,
864         .scan_objects = rpcauth_cache_shrink_scan,
865         .seeks = DEFAULT_SEEKS,
866 };
867 
868 int __init rpcauth_init_module(void)
869 {
870         int err;
871 
872         err = rpc_init_authunix();
873         if (err < 0)
874                 goto out1;
875         err = rpc_init_generic_auth();
876         if (err < 0)
877                 goto out2;
878         register_shrinker(&rpc_cred_shrinker);
879         return 0;
880 out2:
881         rpc_destroy_authunix();
882 out1:
883         return err;
884 }
885 
886 void rpcauth_remove_module(void)
887 {
888         rpc_destroy_authunix();
889         rpc_destroy_generic_auth();
890         unregister_shrinker(&rpc_cred_shrinker);
891 }
892 

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