mirror of https://gitee.com/openkylin/linux.git
893 lines
21 KiB
C
893 lines
21 KiB
C
/*
|
|
* 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);
|
|
if (num > (1U << nbits))
|
|
nbits++;
|
|
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", 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)
|
|
{
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
EXPORT_SYMBOL_GPL(rpcauth_key_timeout_notify);
|
|
|
|
bool
|
|
rpcauth_cred_key_to_expire(struct rpc_cred *cred)
|
|
{
|
|
if (!cred->cr_ops->crkey_to_expire)
|
|
return false;
|
|
return cred->cr_ops->crkey_to_expire(cred);
|
|
}
|
|
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);
|
|
}
|
|
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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
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;
|
|
}
|
|
|
|
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 / 100) * sysctl_vfs_cache_pressure;
|
|
}
|
|
|
|
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 = 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;
|
|
}
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
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);
|
|
}
|
|
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 = {
|
|
.uid = GLOBAL_ROOT_UID,
|
|
.gid = GLOBAL_ROOT_GID,
|
|
};
|
|
|
|
dprintk("RPC: %5u looking up %s cred\n",
|
|
task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
|
|
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;
|
|
|
|
dprintk("RPC: %5u looking up %s cred\n",
|
|
task->tk_pid, auth->au_ops->au_name);
|
|
return rpcauth_lookupcred(auth, lookupflags);
|
|
}
|
|
|
|
static int
|
|
rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
struct rpc_cred *new;
|
|
int lookupflags = 0;
|
|
|
|
if (flags & RPC_TASK_ASYNC)
|
|
lookupflags |= RPCAUTH_LOOKUP_NEW;
|
|
if (cred != NULL)
|
|
new = cred->cr_ops->crbind(task, cred, lookupflags);
|
|
else if (flags & RPC_TASK_ROOTCREDS)
|
|
new = rpcauth_bind_root_cred(task, lookupflags);
|
|
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;
|
|
/* Fast path for unhashed credentials */
|
|
if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) == 0) {
|
|
if (atomic_dec_and_test(&cred->cr_count))
|
|
cred->cr_ops->crdestroy(cred);
|
|
return;
|
|
}
|
|
|
|
if (!atomic_dec_and_lock(&cred->cr_count, &rpc_credcache_lock))
|
|
return;
|
|
if (!list_empty(&cred->cr_lru)) {
|
|
number_cred_unused--;
|
|
list_del_init(&cred->cr_lru);
|
|
}
|
|
if (test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) {
|
|
if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) {
|
|
cred->cr_expire = jiffies;
|
|
list_add_tail(&cred->cr_lru, &cred_unused);
|
|
number_cred_unused++;
|
|
goto out_nodestroy;
|
|
}
|
|
if (!rpcauth_unhash_cred(cred)) {
|
|
/* We were hashed and someone looked us up... */
|
|
goto out_nodestroy;
|
|
}
|
|
}
|
|
spin_unlock(&rpc_credcache_lock);
|
|
cred->cr_ops->crdestroy(cred);
|
|
return;
|
|
out_nodestroy:
|
|
spin_unlock(&rpc_credcache_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(put_rpccred);
|
|
|
|
__be32 *
|
|
rpcauth_marshcred(struct rpc_task *task, __be32 *p)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
dprintk("RPC: %5u marshaling %s cred %p\n",
|
|
task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
|
|
|
|
return cred->cr_ops->crmarshal(task, p);
|
|
}
|
|
|
|
__be32 *
|
|
rpcauth_checkverf(struct rpc_task *task, __be32 *p)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
dprintk("RPC: %5u validating %s cred %p\n",
|
|
task->tk_pid, cred->cr_auth->au_ops->au_name, cred);
|
|
|
|
return cred->cr_ops->crvalidate(task, p);
|
|
}
|
|
|
|
static void rpcauth_wrap_req_encode(kxdreproc_t encode, struct rpc_rqst *rqstp,
|
|
__be32 *data, void *obj)
|
|
{
|
|
struct xdr_stream xdr;
|
|
|
|
xdr_init_encode(&xdr, &rqstp->rq_snd_buf, data);
|
|
encode(rqstp, &xdr, obj);
|
|
}
|
|
|
|
int
|
|
rpcauth_wrap_req(struct rpc_task *task, kxdreproc_t encode, void *rqstp,
|
|
__be32 *data, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
dprintk("RPC: %5u using %s cred %p to wrap rpc data\n",
|
|
task->tk_pid, cred->cr_ops->cr_name, cred);
|
|
if (cred->cr_ops->crwrap_req)
|
|
return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
|
|
/* By default, we encode the arguments normally. */
|
|
rpcauth_wrap_req_encode(encode, rqstp, data, obj);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
rpcauth_unwrap_req_decode(kxdrdproc_t decode, struct rpc_rqst *rqstp,
|
|
__be32 *data, void *obj)
|
|
{
|
|
struct xdr_stream xdr;
|
|
|
|
xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, data);
|
|
return decode(rqstp, &xdr, obj);
|
|
}
|
|
|
|
int
|
|
rpcauth_unwrap_resp(struct rpc_task *task, kxdrdproc_t decode, void *rqstp,
|
|
__be32 *data, void *obj)
|
|
{
|
|
struct rpc_cred *cred = task->tk_rqstp->rq_cred;
|
|
|
|
dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n",
|
|
task->tk_pid, cred->cr_ops->cr_name, cred);
|
|
if (cred->cr_ops->crunwrap_resp)
|
|
return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
|
|
data, obj);
|
|
/* By default, we decode the arguments normally. */
|
|
return rpcauth_unwrap_req_decode(decode, rqstp, data, obj);
|
|
}
|
|
|
|
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;
|
|
}
|
|
dprintk("RPC: %5u refreshing %s cred %p\n",
|
|
task->tk_pid, cred->cr_auth->au_ops->au_name, 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;
|
|
|
|
dprintk("RPC: %5u invalidating %s cred %p\n",
|
|
task->tk_pid, cred->cr_auth->au_ops->au_name, 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 = rpc_init_generic_auth();
|
|
if (err < 0)
|
|
goto out2;
|
|
register_shrinker(&rpc_cred_shrinker);
|
|
return 0;
|
|
out2:
|
|
rpc_destroy_authunix();
|
|
out1:
|
|
return err;
|
|
}
|
|
|
|
void rpcauth_remove_module(void)
|
|
{
|
|
rpc_destroy_authunix();
|
|
rpc_destroy_generic_auth();
|
|
unregister_shrinker(&rpc_cred_shrinker);
|
|
}
|