cregit-Linux how code gets into the kernel

Release 4.8 net/sunrpc/auth.c

Directory: net/sunrpc
/*
 * 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/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>

#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)

# define RPCDBG_FACILITY	RPCDBG_AUTH
#endif


#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 DEFINE_SPINLOCK(rpc_authflavor_lock);

static const struct rpc_authops *auth_flavors[RPC_AUTH_MAXFLAVOR] = {
	&authnull_ops,		/* AUTH_NULL */
	&authunix_ops,		/* AUTH_UNIX */
	NULL,			/* others can be loadable modules */
};

static LIST_HEAD(cred_unused);

static unsigned long number_cred_unused;


#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 == -EINVAL) 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; }

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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", 1U << nbits); }

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#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; }

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int rpcauth_register(const struct rpc_authops *ops) { rpc_authflavor_t flavor; int ret = -EPERM; if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) return -EINVAL; spin_lock(&rpc_authflavor_lock); if (auth_flavors[flavor] == NULL) { auth_flavors[flavor] = ops; ret = 0; } spin_unlock(&rpc_authflavor_lock); return ret; }

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EXPORT_SYMBOL_GPL(rpcauth_register);
int rpcauth_unregister(const struct rpc_authops *ops) { rpc_authflavor_t flavor; int ret = -EPERM; if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR) return -EINVAL; spin_lock(&rpc_authflavor_lock); if (auth_flavors[flavor] == ops) { auth_flavors[flavor] = NULL; ret = 0; } spin_unlock(&rpc_authflavor_lock); return ret; }

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EXPORT_SYMBOL_GPL(rpcauth_unregister); /** * 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; rpc_authflavor_t pseudoflavor; ops = auth_flavors[flavor]; if (ops == NULL) request_module("rpc-auth-%u", flavor); spin_lock(&rpc_authflavor_lock); ops = auth_flavors[flavor]; if (ops == NULL || !try_module_get(ops->owner)) { spin_unlock(&rpc_authflavor_lock); return RPC_AUTH_MAXFLAVOR; } spin_unlock(&rpc_authflavor_lock); pseudoflavor = flavor; if (ops->info2flavor != NULL) pseudoflavor = ops->info2flavor(info); module_put(ops->owner); return pseudoflavor; }

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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; if (flavor >= RPC_AUTH_MAXFLAVOR) return -EINVAL; ops = auth_flavors[flavor]; if (ops == NULL) request_module("rpc-auth-%u", flavor); spin_lock(&rpc_authflavor_lock); ops = auth_flavors[flavor]; if (ops == NULL || !try_module_get(ops->owner)) { spin_unlock(&rpc_authflavor_lock); return -ENOENT; } spin_unlock(&rpc_authflavor_lock); result = -ENOENT; if (ops->flavor2info != NULL) result = ops->flavor2info(pseudoflavor, info); module_put(ops->owner); return result; }

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EXPORT_SYMBOL_GPL(rpcauth_get_gssinfo); /** * rpcauth_list_flavors - discover registered flavors and pseudoflavors * @array: array to fill in * @size: size of "array" * * Returns the number of array items filled in, or a negative errno. * * The returned array is not sorted by any policy. Callers should not * rely on the order of the items in the returned array. */
int rpcauth_list_flavors(rpc_authflavor_t *array, int size) { rpc_authflavor_t flavor; int result = 0; spin_lock(&rpc_authflavor_lock); for (flavor = 0; flavor < RPC_AUTH_MAXFLAVOR; flavor++) { const struct rpc_authops *ops = auth_flavors[flavor]; rpc_authflavor_t pseudos[4]; int i, len; if (result >= size) { result = -ENOMEM; break; } if (ops == NULL) continue; if (ops->list_pseudoflavors == NULL) { array[result++] = ops->au_flavor; continue; } len = ops->list_pseudoflavors(pseudos, ARRAY_SIZE(pseudos)); if (len < 0) { result = len; break; } for (i = 0; i < len; i++) { if (result >= size) { result = -ENOMEM; break; } array[result++] = pseudos[i]; } } spin_unlock(&rpc_authflavor_lock); dprintk("RPC: %s returns %d\n", __func__, result); return result; }

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EXPORT_SYMBOL_GPL(rpcauth_list_flavors);
struct rpc_auth * rpcauth_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt) { struct rpc_auth *auth; const struct rpc_authops *ops; u32 flavor = pseudoflavor_to_flavor(args->pseudoflavor); auth = ERR_PTR(-EINVAL); if (flavor >= RPC_AUTH_MAXFLAVOR) goto out; if ((ops = auth_flavors[flavor]) == NULL) request_module("rpc-auth-%u", flavor); spin_lock(&rpc_authflavor_lock); ops = auth_flavors[flavor]; if (ops == NULL || !try_module_get(ops->owner)) { spin_unlock(&rpc_authflavor_lock); goto out; } spin_unlock(&rpc_authflavor_lock); auth = ops->create(args, clnt); module_put(ops->owner); if (IS_ERR(auth)) return auth; if (clnt->cl_auth) rpcauth_release(clnt->cl_auth); clnt->cl_auth = auth; out: return auth; }

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EXPORT_SYMBOL_GPL(rpcauth_create);
void rpcauth_release(struct rpc_auth *auth) { if (!atomic_dec_and_test(&auth->au_count)) return; auth->au_ops->destroy(auth); }

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static DEFINE_SPINLOCK(rpc_credcache_lock);
static void rpcauth_unhash_cred_locked(struct rpc_cred *cred) { hlist_del_rcu(&cred->cr_hash); smp_mb__before_atomic(); clear_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags); }

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static int rpcauth_unhash_cred(struct rpc_cred *cred) { spinlock_t *cache_lock; int ret; cache_lock = &cred->cr_auth->au_credcache->lock; spin_lock(cache_lock); ret = atomic_read(&cred->cr_count) == 0; if (ret) rpcauth_unhash_cred_locked(cred); spin_unlock(cache_lock); return ret; }

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/* * 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; }

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EXPORT_SYMBOL_GPL(rpcauth_init_credcache); /* * Setup a credential key lifetime timeout notification */
int rpcauth_key_timeout_notify(struct rpc_auth *auth, struct rpc_cred *cred) { if (!cred->cr_auth->au_ops->key_timeout) return 0; return cred->cr_auth->au_ops->key_timeout(auth, cred); }

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EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify);
bool rpcauth_cred_key_to_expire(struct rpc_auth *auth, struct rpc_cred *cred) { if (auth->au_flags & RPCAUTH_AUTH_NO_CRKEY_TIMEOUT) return false; if (!cred->cr_ops->crkey_to_expire) return false; return cred->cr_ops->crkey_to_expire(cred); }

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EXPORT_SYMBOL_GPL(rpcauth_cred_key_to_expire);
char * rpcauth_stringify_acceptor(struct rpc_cred *cred) { if (!cred->cr_ops->crstringify_acceptor) return NULL; return cred->cr_ops->crstringify_acceptor(cred); }

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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); } }

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/* * 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); get_rpccred(cred); if (!list_empty(&cred->cr_lru)) { list_del(&cred->cr_lru); number_cred_unused--; } list_add_tail(&cred->cr_lru, &free); rpcauth_unhash_cred_locked(cred); } } spin_unlock(&cache->lock); spin_unlock(&rpc_credcache_lock); rpcauth_destroy_credlist(&free); }

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/* * 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); } }

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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) { spinlock_t *cache_lock; 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; /* * 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) && test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) break; list_del_init(&cred->cr_lru); number_cred_unused--; freed++; if (atomic_read(&cred->cr_count) != 0) continue; cache_lock = &cred->cr_auth->au_credcache->lock; spin_lock(cache_lock); if (atomic_read(&cred->cr_count) == 0) { get_rpccred(cred); list_add_tail(&cred->cr_lru, free); rpcauth_unhash_cred_locked(cred); } spin_unlock(cache_lock); } return freed; }

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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; }

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/* * 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); }

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static unsigned long rpcauth_cache_shrink_count(struct shrinker *shrink, struct shrink_control *sc) { return (number_cred_unused / 100) * sysctl_vfs_cache_pressure; }

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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); }

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/* * 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 = hash_long(from_kuid(&init_user_ns, acred->uid), 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; if (flags & RPCAUTH_LOOKUP_RCU) { if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) && !test_bit(RPCAUTH_CRED_NEW, &entry->cr_flags)) cred = entry; break; } spin_lock(&cache->lock); if (test_bit(RPCAUTH_CRED_HASHED, &entry->cr_flags) == 0) { spin_unlock(&cache->lock); continue; } cred = get_rpccred(entry); spin_unlock(&cache->lock); break; } rcu_read_unlock(); if (cred != NULL) goto found; if (flags & RPCAUTH_LOOKUP_RCU) return ERR_PTR(-ECHILD); 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); break; } if (cred == NULL) { cred = new; set_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags); 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; }

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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(); dprintk("RPC: looking up %s cred\n", auth->au_ops->au_name); memset(&acred, 0, sizeof(acred)); acred.uid = cred->fsuid; acred.gid = cred->fsgid; acred.group_info = cred->group_info; ret = auth->au_ops->lookup_cred(auth, &acred, flags); return ret; }

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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); atomic_set(&cred->cr_count, 1); cred->cr_auth = auth; cred->cr_ops = ops; cred->cr_expire = jiffies; #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) cred->cr_magic = RPCAUTH_CRED_MAGIC; #endif cred->cr_uid = acred->uid; }

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EXPORT_SYMBOL_GPL(rpcauth_init_cred);
struct rpc_cred * rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred, int lookupflags) { dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid, cred->cr_auth->au_ops->au_name, cred); return get_rpccred(cred); }

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EXPORT_SYMBOL_GPL(rpcauth_generic_bind_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 = { .