| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * linux/net/sunrpc/auth.c |
| * |
| * Generic RPC client authentication API. |
| * |
| * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/sched.h> |
| #include <linux/cred.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/hash.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/sunrpc/gss_api.h> |
| #include <linux/spinlock.h> |
| |
| #include <trace/events/sunrpc.h> |
| |
| #define RPC_CREDCACHE_DEFAULT_HASHBITS (4) |
| struct rpc_cred_cache { |
| struct hlist_head *hashtable; |
| unsigned int hashbits; |
| spinlock_t lock; |
| }; |
| |
| static unsigned int auth_hashbits = RPC_CREDCACHE_DEFAULT_HASHBITS; |
| |
| static const struct rpc_authops __rcu *auth_flavors[RPC_AUTH_MAXFLAVOR] = { |
| [RPC_AUTH_NULL] = (const struct rpc_authops __force __rcu *)&authnull_ops, |
| [RPC_AUTH_UNIX] = (const struct rpc_authops __force __rcu *)&authunix_ops, |
| [RPC_AUTH_TLS] = (const struct rpc_authops __force __rcu *)&authtls_ops, |
| }; |
| |
| static LIST_HEAD(cred_unused); |
| static unsigned long number_cred_unused; |
| |
| static struct cred machine_cred = { |
| .usage = ATOMIC_INIT(1), |
| #ifdef CONFIG_DEBUG_CREDENTIALS |
| .magic = CRED_MAGIC, |
| #endif |
| }; |
| |
| /* |
| * Return the machine_cred pointer to be used whenever |
| * the a generic machine credential is needed. |
| */ |
| const struct cred *rpc_machine_cred(void) |
| { |
| return &machine_cred; |
| } |
| EXPORT_SYMBOL_GPL(rpc_machine_cred); |
| |
| #define MAX_HASHTABLE_BITS (14) |
| static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp) |
| { |
| unsigned long num; |
| unsigned int nbits; |
| int ret; |
| |
| if (!val) |
| goto out_inval; |
| ret = kstrtoul(val, 0, &num); |
| if (ret) |
| goto out_inval; |
| nbits = fls(num - 1); |
| if (nbits > MAX_HASHTABLE_BITS || nbits < 2) |
| goto out_inval; |
| *(unsigned int *)kp->arg = nbits; |
| return 0; |
| out_inval: |
| return -EINVAL; |
| } |
| |
| static int param_get_hashtbl_sz(char *buffer, const struct kernel_param *kp) |
| { |
| unsigned int nbits; |
| |
| nbits = *(unsigned int *)kp->arg; |
| return sprintf(buffer, "%u\n", 1U << nbits); |
| } |
| |
| #define param_check_hashtbl_sz(name, p) __param_check(name, p, unsigned int); |
| |
| static const struct kernel_param_ops param_ops_hashtbl_sz = { |
| .set = param_set_hashtbl_sz, |
| .get = param_get_hashtbl_sz, |
| }; |
| |
| module_param_named(auth_hashtable_size, auth_hashbits, hashtbl_sz, 0644); |
| MODULE_PARM_DESC(auth_hashtable_size, "RPC credential cache hashtable size"); |
| |
| static unsigned long auth_max_cred_cachesize = ULONG_MAX; |
| module_param(auth_max_cred_cachesize, ulong, 0644); |
| MODULE_PARM_DESC(auth_max_cred_cachesize, "RPC credential maximum total cache size"); |
| |
| static u32 |
| pseudoflavor_to_flavor(u32 flavor) { |
| if (flavor > RPC_AUTH_MAXFLAVOR) |
| return RPC_AUTH_GSS; |
| return flavor; |
| } |
| |
| int |
| rpcauth_register(const struct rpc_authops *ops) |
| { |
| const struct rpc_authops *old; |
| rpc_authflavor_t flavor; |
| |
| if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) |
| return -EINVAL; |
| old = cmpxchg((const struct rpc_authops ** __force)&auth_flavors[flavor], NULL, ops); |
| if (old == NULL || old == ops) |
| return 0; |
| return -EPERM; |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_register); |
| |
| int |
| rpcauth_unregister(const struct rpc_authops *ops) |
| { |
| const struct rpc_authops *old; |
| rpc_authflavor_t flavor; |
| |
| if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) |
| return -EINVAL; |
| |
| old = cmpxchg((const struct rpc_authops ** __force)&auth_flavors[flavor], ops, NULL); |
| if (old == ops || old == NULL) |
| return 0; |
| return -EPERM; |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_unregister); |
| |
| static const struct rpc_authops * |
| rpcauth_get_authops(rpc_authflavor_t flavor) |
| { |
| const struct rpc_authops *ops; |
| |
| if (flavor >= RPC_AUTH_MAXFLAVOR) |
| return NULL; |
| |
| rcu_read_lock(); |
| ops = rcu_dereference(auth_flavors[flavor]); |
| if (ops == NULL) { |
| rcu_read_unlock(); |
| request_module("rpc-auth-%u", flavor); |
| rcu_read_lock(); |
| ops = rcu_dereference(auth_flavors[flavor]); |
| if (ops == NULL) |
| goto out; |
| } |
| if (!try_module_get(ops->owner)) |
| ops = NULL; |
| out: |
| rcu_read_unlock(); |
| return ops; |
| } |
| |
| static void |
| rpcauth_put_authops(const struct rpc_authops *ops) |
| { |
| module_put(ops->owner); |
| } |
| |
| /** |
| * rpcauth_get_pseudoflavor - check if security flavor is supported |
| * @flavor: a security flavor |
| * @info: a GSS mech OID, quality of protection, and service value |
| * |
| * Verifies that an appropriate kernel module is available or already loaded. |
| * Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is |
| * not supported locally. |
| */ |
| rpc_authflavor_t |
| rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info) |
| { |
| const struct rpc_authops *ops = rpcauth_get_authops(flavor); |
| rpc_authflavor_t pseudoflavor; |
| |
| if (!ops) |
| return RPC_AUTH_MAXFLAVOR; |
| pseudoflavor = flavor; |
| if (ops->info2flavor != NULL) |
| pseudoflavor = ops->info2flavor(info); |
| |
| rpcauth_put_authops(ops); |
| return pseudoflavor; |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor); |
| |
| /** |
| * rpcauth_get_gssinfo - find GSS tuple matching a GSS pseudoflavor |
| * @pseudoflavor: GSS pseudoflavor to match |
| * @info: rpcsec_gss_info structure to fill in |
| * |
| * Returns zero and fills in "info" if pseudoflavor matches a |
| * supported mechanism. |
| */ |
| int |
| rpcauth_get_gssinfo(rpc_authflavor_t pseudoflavor, struct rpcsec_gss_info *info) |
| { |
| rpc_authflavor_t flavor = pseudoflavor_to_flavor(pseudoflavor); |
| const struct rpc_authops *ops; |
| int result; |
| |
| ops = rpcauth_get_authops(flavor); |
| if (ops == NULL) |
| return -ENOENT; |
| |
| result = -ENOENT; |
| if (ops->flavor2info != NULL) |
| result = ops->flavor2info(pseudoflavor, info); |
| |
| rpcauth_put_authops(ops); |
| return result; |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo); |
| |
| struct rpc_auth * |
| rpcauth_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
| { |
| struct rpc_auth *auth = ERR_PTR(-EINVAL); |
| const struct rpc_authops *ops; |
| u32 flavor = pseudoflavor_to_flavor(args->pseudoflavor); |
| |
| ops = rpcauth_get_authops(flavor); |
| if (ops == NULL) |
| goto out; |
| |
| auth = ops->create(args, clnt); |
| |
| rpcauth_put_authops(ops); |
| if (IS_ERR(auth)) |
| return auth; |
| if (clnt->cl_auth) |
| rpcauth_release(clnt->cl_auth); |
| clnt->cl_auth = auth; |
| |
| out: |
| return auth; |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_create); |
| |
| void |
| rpcauth_release(struct rpc_auth *auth) |
| { |
| if (!refcount_dec_and_test(&auth->au_count)) |
| return; |
| auth->au_ops->destroy(auth); |
| } |
| |
| static DEFINE_SPINLOCK(rpc_credcache_lock); |
| |
| /* |
| * On success, the caller is responsible for freeing the reference |
| * held by the hashtable |
| */ |
| static bool |
| rpcauth_unhash_cred_locked(struct rpc_cred *cred) |
| { |
| if (!test_and_clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags)) |
| return false; |
| hlist_del_rcu(&cred->cr_hash); |
| return true; |
| } |
| |
| static bool |
| rpcauth_unhash_cred(struct rpc_cred *cred) |
| { |
| spinlock_t *cache_lock; |
| bool ret; |
| |
| if (!test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags)) |
| return false; |
| cache_lock = &cred->cr_auth->au_credcache->lock; |
| spin_lock(cache_lock); |
| ret = rpcauth_unhash_cred_locked(cred); |
| spin_unlock(cache_lock); |
| return ret; |
| } |
| |
| /* |
| * Initialize RPC credential cache |
| */ |
| int |
| rpcauth_init_credcache(struct rpc_auth *auth) |
| { |
| struct rpc_cred_cache *new; |
| unsigned int hashsize; |
| |
| new = kmalloc(sizeof(*new), GFP_KERNEL); |
| if (!new) |
| goto out_nocache; |
| new->hashbits = auth_hashbits; |
| hashsize = 1U << new->hashbits; |
| new->hashtable = kcalloc(hashsize, sizeof(new->hashtable[0]), GFP_KERNEL); |
| if (!new->hashtable) |
| goto out_nohashtbl; |
| spin_lock_init(&new->lock); |
| auth->au_credcache = new; |
| return 0; |
| out_nohashtbl: |
| kfree(new); |
| out_nocache: |
| return -ENOMEM; |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_init_credcache); |
| |
| char * |
| rpcauth_stringify_acceptor(struct rpc_cred *cred) |
| { |
| if (!cred->cr_ops->crstringify_acceptor) |
| return NULL; |
| return cred->cr_ops->crstringify_acceptor(cred); |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_stringify_acceptor); |
| |
| /* |
| * Destroy a list of credentials |
| */ |
| static inline |
| void rpcauth_destroy_credlist(struct list_head *head) |
| { |
| struct rpc_cred *cred; |
| |
| while (!list_empty(head)) { |
| cred = list_entry(head->next, struct rpc_cred, cr_lru); |
| list_del_init(&cred->cr_lru); |
| put_rpccred(cred); |
| } |
| } |
| |
| static void |
| rpcauth_lru_add_locked(struct rpc_cred *cred) |
| { |
| if (!list_empty(&cred->cr_lru)) |
| return; |
| number_cred_unused++; |
| list_add_tail(&cred->cr_lru, &cred_unused); |
| } |
| |
| static void |
| rpcauth_lru_add(struct rpc_cred *cred) |
| { |
| if (!list_empty(&cred->cr_lru)) |
| return; |
| spin_lock(&rpc_credcache_lock); |
| rpcauth_lru_add_locked(cred); |
| spin_unlock(&rpc_credcache_lock); |
| } |
| |
| static void |
| rpcauth_lru_remove_locked(struct rpc_cred *cred) |
| { |
| if (list_empty(&cred->cr_lru)) |
| return; |
| number_cred_unused--; |
| list_del_init(&cred->cr_lru); |
| } |
| |
| static void |
| rpcauth_lru_remove(struct rpc_cred *cred) |
| { |
| if (list_empty(&cred->cr_lru)) |
| return; |
| spin_lock(&rpc_credcache_lock); |
| rpcauth_lru_remove_locked(cred); |
| spin_unlock(&rpc_credcache_lock); |
| } |
| |
| /* |
| * Clear the RPC credential cache, and delete those credentials |
| * that are not referenced. |
| */ |
| void |
| rpcauth_clear_credcache(struct rpc_cred_cache *cache) |
| { |
| LIST_HEAD(free); |
| struct hlist_head *head; |
| struct rpc_cred *cred; |
| unsigned int hashsize = 1U << cache->hashbits; |
| int i; |
| |
| spin_lock(&rpc_credcache_lock); |
| spin_lock(&cache->lock); |
| for (i = 0; i < hashsize; i++) { |
| head = &cache->hashtable[i]; |
| while (!hlist_empty(head)) { |
| cred = hlist_entry(head->first, struct rpc_cred, cr_hash); |
| rpcauth_unhash_cred_locked(cred); |
| /* Note: We now hold a reference to cred */ |
| rpcauth_lru_remove_locked(cred); |
| list_add_tail(&cred->cr_lru, &free); |
| } |
| } |
| spin_unlock(&cache->lock); |
| spin_unlock(&rpc_credcache_lock); |
| rpcauth_destroy_credlist(&free); |
| } |
| |
| /* |
| * Destroy the RPC credential cache |
| */ |
| void |
| rpcauth_destroy_credcache(struct rpc_auth *auth) |
| { |
| struct rpc_cred_cache *cache = auth->au_credcache; |
| |
| if (cache) { |
| auth->au_credcache = NULL; |
| rpcauth_clear_credcache(cache); |
| kfree(cache->hashtable); |
| kfree(cache); |
| } |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache); |
| |
| |
| #define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ) |
| |
| /* |
| * Remove stale credentials. Avoid sleeping inside the loop. |
| */ |
| static long |
| rpcauth_prune_expired(struct list_head *free, int nr_to_scan) |
| { |
| struct rpc_cred *cred, *next; |
| unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM; |
| long freed = 0; |
| |
| list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) { |
| |
| if (nr_to_scan-- == 0) |
| break; |
| if (refcount_read(&cred->cr_count) > 1) { |
| rpcauth_lru_remove_locked(cred); |
| continue; |
| } |
| /* |
| * Enforce a 60 second garbage collection moratorium |
| * Note that the cred_unused list must be time-ordered. |
| */ |
| if (time_in_range(cred->cr_expire, expired, jiffies)) |
| continue; |
| if (!rpcauth_unhash_cred(cred)) |
| continue; |
| |
| rpcauth_lru_remove_locked(cred); |
| freed++; |
| list_add_tail(&cred->cr_lru, free); |
| } |
| return freed ? freed : SHRINK_STOP; |
| } |
| |
| static unsigned long |
| rpcauth_cache_do_shrink(int nr_to_scan) |
| { |
| LIST_HEAD(free); |
| unsigned long freed; |
| |
| spin_lock(&rpc_credcache_lock); |
| freed = rpcauth_prune_expired(&free, nr_to_scan); |
| spin_unlock(&rpc_credcache_lock); |
| rpcauth_destroy_credlist(&free); |
| |
| return freed; |
| } |
| |
| /* |
| * Run memory cache shrinker. |
| */ |
| static unsigned long |
| rpcauth_cache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) |
| |
| { |
| if ((sc->gfp_mask & GFP_KERNEL) != GFP_KERNEL) |
| return SHRINK_STOP; |
| |
| /* nothing left, don't come back */ |
| if (list_empty(&cred_unused)) |
| return SHRINK_STOP; |
| |
| return rpcauth_cache_do_shrink(sc->nr_to_scan); |
| } |
| |
| static unsigned long |
| rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) |
| |
| { |
| return number_cred_unused * sysctl_vfs_cache_pressure / 100; |
| } |
| |
| static void |
| rpcauth_cache_enforce_limit(void) |
| { |
| unsigned long diff; |
| unsigned int nr_to_scan; |
| |
| if (number_cred_unused <= auth_max_cred_cachesize) |
| return; |
| diff = number_cred_unused - auth_max_cred_cachesize; |
| nr_to_scan = 100; |
| if (diff < nr_to_scan) |
| nr_to_scan = diff; |
| rpcauth_cache_do_shrink(nr_to_scan); |
| } |
| |
| /* |
| * Look up a process' credentials in the authentication cache |
| */ |
| struct rpc_cred * |
| rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred, |
| int flags, gfp_t gfp) |
| { |
| LIST_HEAD(free); |
| struct rpc_cred_cache *cache = auth->au_credcache; |
| struct rpc_cred *cred = NULL, |
| *entry, *new; |
| unsigned int nr; |
| |
| nr = auth->au_ops->hash_cred(acred, cache->hashbits); |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(entry, &cache->hashtable[nr], cr_hash) { |
| if (!entry->cr_ops->crmatch(acred, entry, flags)) |
| continue; |
| cred = get_rpccred(entry); |
| if (cred) |
| break; |
| } |
| rcu_read_unlock(); |
| |
| if (cred != NULL) |
| goto found; |
| |
| new = auth->au_ops->crcreate(auth, acred, flags, gfp); |
| if (IS_ERR(new)) { |
| cred = new; |
| goto out; |
| } |
| |
| spin_lock(&cache->lock); |
| hlist_for_each_entry(entry, &cache->hashtable[nr], cr_hash) { |
| if (!entry->cr_ops->crmatch(acred, entry, flags)) |
| continue; |
| cred = get_rpccred(entry); |
| if (cred) |
| break; |
| } |
| if (cred == NULL) { |
| cred = new; |
| set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags); |
| refcount_inc(&cred->cr_count); |
| hlist_add_head_rcu(&cred->cr_hash, &cache->hashtable[nr]); |
| } else |
| list_add_tail(&new->cr_lru, &free); |
| spin_unlock(&cache->lock); |
| rpcauth_cache_enforce_limit(); |
| found: |
| if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
| cred->cr_ops->cr_init != NULL && |
| !(flags & RPCAUTH_LOOKUP_NEW)) { |
| int res = cred->cr_ops->cr_init(auth, cred); |
| if (res < 0) { |
| put_rpccred(cred); |
| cred = ERR_PTR(res); |
| } |
| } |
| rpcauth_destroy_credlist(&free); |
| out: |
| return cred; |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache); |
| |
| struct rpc_cred * |
| rpcauth_lookupcred(struct rpc_auth *auth, int flags) |
| { |
| struct auth_cred acred; |
| struct rpc_cred *ret; |
| const struct cred *cred = current_cred(); |
| |
| memset(&acred, 0, sizeof(acred)); |
| acred.cred = cred; |
| ret = auth->au_ops->lookup_cred(auth, &acred, flags); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_lookupcred); |
| |
| void |
| rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred, |
| struct rpc_auth *auth, const struct rpc_credops *ops) |
| { |
| INIT_HLIST_NODE(&cred->cr_hash); |
| INIT_LIST_HEAD(&cred->cr_lru); |
| refcount_set(&cred->cr_count, 1); |
| cred->cr_auth = auth; |
| cred->cr_flags = 0; |
| cred->cr_ops = ops; |
| cred->cr_expire = jiffies; |
| cred->cr_cred = get_cred(acred->cred); |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_init_cred); |
| |
| static struct rpc_cred * |
| rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags) |
| { |
| struct rpc_auth *auth = task->tk_client->cl_auth; |
| struct auth_cred acred = { |
| .cred = get_task_cred(&init_task), |
| }; |
| struct rpc_cred *ret; |
| |
| if (RPC_IS_ASYNC(task)) |
| lookupflags |= RPCAUTH_LOOKUP_ASYNC; |
| ret = auth->au_ops->lookup_cred(auth, &acred, lookupflags); |
| put_cred(acred.cred); |
| return ret; |
| } |
| |
| static struct rpc_cred * |
| rpcauth_bind_machine_cred(struct rpc_task *task, int lookupflags) |
| { |
| struct rpc_auth *auth = task->tk_client->cl_auth; |
| struct auth_cred acred = { |
| .principal = task->tk_client->cl_principal, |
| .cred = init_task.cred, |
| }; |
| |
| if (!acred.principal) |
| return NULL; |
| if (RPC_IS_ASYNC(task)) |
| lookupflags |= RPCAUTH_LOOKUP_ASYNC; |
| return auth->au_ops->lookup_cred(auth, &acred, lookupflags); |
| } |
| |
| static struct rpc_cred * |
| rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags) |
| { |
| struct rpc_auth *auth = task->tk_client->cl_auth; |
| |
| return rpcauth_lookupcred(auth, lookupflags); |
| } |
| |
| static int |
| rpcauth_bindcred(struct rpc_task *task, const struct cred *cred, int flags) |
| { |
| struct rpc_rqst *req = task->tk_rqstp; |
| struct rpc_cred *new = NULL; |
| int lookupflags = 0; |
| struct rpc_auth *auth = task->tk_client->cl_auth; |
| struct auth_cred acred = { |
| .cred = cred, |
| }; |
| |
| if (flags & RPC_TASK_ASYNC) |
| lookupflags |= RPCAUTH_LOOKUP_NEW | RPCAUTH_LOOKUP_ASYNC; |
| if (task->tk_op_cred) |
| /* Task must use exactly this rpc_cred */ |
| new = get_rpccred(task->tk_op_cred); |
| else if (cred != NULL && cred != &machine_cred) |
| new = auth->au_ops->lookup_cred(auth, &acred, lookupflags); |
| else if (cred == &machine_cred) |
| new = rpcauth_bind_machine_cred(task, lookupflags); |
| |
| /* If machine cred couldn't be bound, try a root cred */ |
| if (new) |
| ; |
| else if (cred == &machine_cred) |
| new = rpcauth_bind_root_cred(task, lookupflags); |
| else if (flags & RPC_TASK_NULLCREDS) |
| new = authnull_ops.lookup_cred(NULL, NULL, 0); |
| else |
| new = rpcauth_bind_new_cred(task, lookupflags); |
| if (IS_ERR(new)) |
| return PTR_ERR(new); |
| put_rpccred(req->rq_cred); |
| req->rq_cred = new; |
| return 0; |
| } |
| |
| void |
| put_rpccred(struct rpc_cred *cred) |
| { |
| if (cred == NULL) |
| return; |
| rcu_read_lock(); |
| if (refcount_dec_and_test(&cred->cr_count)) |
| goto destroy; |
| if (refcount_read(&cred->cr_count) != 1 || |
| !test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags)) |
| goto out; |
| if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) { |
| cred->cr_expire = jiffies; |
| rpcauth_lru_add(cred); |
| /* Race breaker */ |
| if (unlikely(!test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags))) |
| rpcauth_lru_remove(cred); |
| } else if (rpcauth_unhash_cred(cred)) { |
| rpcauth_lru_remove(cred); |
| if (refcount_dec_and_test(&cred->cr_count)) |
| goto destroy; |
| } |
| out: |
| rcu_read_unlock(); |
| return; |
| destroy: |
| rcu_read_unlock(); |
| cred->cr_ops->crdestroy(cred); |
| } |
| EXPORT_SYMBOL_GPL(put_rpccred); |
| |
| /** |
| * rpcauth_marshcred - Append RPC credential to end of @xdr |
| * @task: controlling RPC task |
| * @xdr: xdr_stream containing initial portion of RPC Call header |
| * |
| * On success, an appropriate verifier is added to @xdr, @xdr is |
| * updated to point past the verifier, and zero is returned. |
| * Otherwise, @xdr is in an undefined state and a negative errno |
| * is returned. |
| */ |
| int rpcauth_marshcred(struct rpc_task *task, struct xdr_stream *xdr) |
| { |
| const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; |
| |
| return ops->crmarshal(task, xdr); |
| } |
| |
| /** |
| * rpcauth_wrap_req_encode - XDR encode the RPC procedure |
| * @task: controlling RPC task |
| * @xdr: stream where on-the-wire bytes are to be marshalled |
| * |
| * On success, @xdr contains the encoded and wrapped message. |
| * Otherwise, @xdr is in an undefined state. |
| */ |
| int rpcauth_wrap_req_encode(struct rpc_task *task, struct xdr_stream *xdr) |
| { |
| kxdreproc_t encode = task->tk_msg.rpc_proc->p_encode; |
| |
| encode(task->tk_rqstp, xdr, task->tk_msg.rpc_argp); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_wrap_req_encode); |
| |
| /** |
| * rpcauth_wrap_req - XDR encode and wrap the RPC procedure |
| * @task: controlling RPC task |
| * @xdr: stream where on-the-wire bytes are to be marshalled |
| * |
| * On success, @xdr contains the encoded and wrapped message, |
| * and zero is returned. Otherwise, @xdr is in an undefined |
| * state and a negative errno is returned. |
| */ |
| int rpcauth_wrap_req(struct rpc_task *task, struct xdr_stream *xdr) |
| { |
| const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; |
| |
| return ops->crwrap_req(task, xdr); |
| } |
| |
| /** |
| * rpcauth_checkverf - Validate verifier in RPC Reply header |
| * @task: controlling RPC task |
| * @xdr: xdr_stream containing RPC Reply header |
| * |
| * On success, @xdr is updated to point past the verifier and |
| * zero is returned. Otherwise, @xdr is in an undefined state |
| * and a negative errno is returned. |
| */ |
| int |
| rpcauth_checkverf(struct rpc_task *task, struct xdr_stream *xdr) |
| { |
| const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; |
| |
| return ops->crvalidate(task, xdr); |
| } |
| |
| /** |
| * rpcauth_unwrap_resp_decode - Invoke XDR decode function |
| * @task: controlling RPC task |
| * @xdr: stream where the Reply message resides |
| * |
| * Returns zero on success; otherwise a negative errno is returned. |
| */ |
| int |
| rpcauth_unwrap_resp_decode(struct rpc_task *task, struct xdr_stream *xdr) |
| { |
| kxdrdproc_t decode = task->tk_msg.rpc_proc->p_decode; |
| |
| return decode(task->tk_rqstp, xdr, task->tk_msg.rpc_resp); |
| } |
| EXPORT_SYMBOL_GPL(rpcauth_unwrap_resp_decode); |
| |
| /** |
| * rpcauth_unwrap_resp - Invoke unwrap and decode function for the cred |
| * @task: controlling RPC task |
| * @xdr: stream where the Reply message resides |
| * |
| * Returns zero on success; otherwise a negative errno is returned. |
| */ |
| int |
| rpcauth_unwrap_resp(struct rpc_task *task, struct xdr_stream *xdr) |
| { |
| const struct rpc_credops *ops = task->tk_rqstp->rq_cred->cr_ops; |
| |
| return ops->crunwrap_resp(task, xdr); |
| } |
| |
| bool |
| rpcauth_xmit_need_reencode(struct rpc_task *task) |
| { |
| struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
| |
| if (!cred || !cred->cr_ops->crneed_reencode) |
| return false; |
| return cred->cr_ops->crneed_reencode(task); |
| } |
| |
| int |
| rpcauth_refreshcred(struct rpc_task *task) |
| { |
| struct rpc_cred *cred; |
| int err; |
| |
| cred = task->tk_rqstp->rq_cred; |
| if (cred == NULL) { |
| err = rpcauth_bindcred(task, task->tk_msg.rpc_cred, task->tk_flags); |
| if (err < 0) |
| goto out; |
| cred = task->tk_rqstp->rq_cred; |
| } |
| |
| err = cred->cr_ops->crrefresh(task); |
| out: |
| if (err < 0) |
| task->tk_status = err; |
| return err; |
| } |
| |
| void |
| rpcauth_invalcred(struct rpc_task *task) |
| { |
| struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
| |
| if (cred) |
| clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
| } |
| |
| int |
| rpcauth_uptodatecred(struct rpc_task *task) |
| { |
| struct rpc_cred *cred = task->tk_rqstp->rq_cred; |
| |
| return cred == NULL || |
| test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0; |
| } |
| |
| static struct shrinker rpc_cred_shrinker = { |
| .count_objects = rpcauth_cache_shrink_count, |
| .scan_objects = rpcauth_cache_shrink_scan, |
| .seeks = DEFAULT_SEEKS, |
| }; |
| |
| int __init rpcauth_init_module(void) |
| { |
| int err; |
| |
| err = rpc_init_authunix(); |
| if (err < 0) |
| goto out1; |
| err = register_shrinker(&rpc_cred_shrinker, "sunrpc_cred"); |
| if (err < 0) |
| goto out2; |
| return 0; |
| out2: |
| rpc_destroy_authunix(); |
| out1: |
| return err; |
| } |
| |
| void rpcauth_remove_module(void) |
| { |
| rpc_destroy_authunix(); |
| unregister_shrinker(&rpc_cred_shrinker); |
| } |