Release 4.11 net/sunrpc/auth.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/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>

#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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35
20.47%
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J. Bruce Fields
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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) {
			freed = SHRINK_STOP;
			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 * sysctl_vfs_cache_pressure / 100;
}

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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 = 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;
		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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
318
75.36%
13
59.09%
Neil Brown
49
11.61%
1
4.55%
Linus Torvalds (pre-git)
44
10.43%
5
22.73%
Frank Sorenson
5
1.18%
1
4.55%
Jeff Layton
5
1.18%
1
4.55%
Eric W. Biedermann
1
0.24%
1
4.55%
Total
422
100.00%
22
100.00%


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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Howells
35
35.00%
1
10.00%
Linus Torvalds (pre-git)
29
29.00%
2
20.00%
Trond Myklebust
23
23.00%
4
40.00%
Neil Brown
7
7.00%
1
10.00%
Andrew Morton
5
5.00%
1
10.00%
Chuck Lever
1
1.00%
1
10.00%
Total
100
100.00%
10
100.00%


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;
	cred->cr_uid = acred->uid;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
79
100.00%
2
100.00%
Total
79
100.00%
2
100.00%


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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
45
100.00%
3
100.00%
Total
45
100.00%
3
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Trond Myklebust
40
51.95%
8
66.67%
Linus Torvalds (pre-git)
34
44.16%
2
16.67%
Eric W. Biedermann
2
2.60%
1
8.33%
Chuck Lever
1
1.30%
1
8.33%
Total
77
100.00%
12
100.00%


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"