[mirror_ubuntu-zesty-kernel.git] / 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/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/sunrpc/clnt.h>
#include <linux/spinlock.h>

#ifdef RPC_DEBUG
# define RPCDBG_FACILITY	RPCDBG_AUTH
#endif

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

static u32
pseudoflavor_to_flavor(u32 flavor) {
	if (flavor >= RPC_AUTH_MAXFLAVOR)
		return RPC_AUTH_GSS;
	return flavor;
}

int
rpcauth_register(struct rpc_authops *ops)
{
	rpc_authflavor_t flavor;

	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
		return -EINVAL;
	if (auth_flavors[flavor] != NULL)
		return -EPERM;		/* what else? */
	auth_flavors[flavor] = ops;
	return 0;
}

int
rpcauth_unregister(struct rpc_authops *ops)
{
	rpc_authflavor_t flavor;

	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
		return -EINVAL;
	if (auth_flavors[flavor] != ops)
		return -EPERM;		/* what else? */
	auth_flavors[flavor] = NULL;
	return 0;
}

struct rpc_auth *
rpcauth_create(rpc_authflavor_t pseudoflavor, struct rpc_clnt *clnt)
{
	struct rpc_auth		*auth;
	struct rpc_authops	*ops;
	u32			flavor = pseudoflavor_to_flavor(pseudoflavor);

	auth = ERR_PTR(-EINVAL);
	if (flavor >= RPC_AUTH_MAXFLAVOR)
		goto out;

	/* FIXME - auth_flavors[] really needs an rw lock,
	 * and module refcounting. */
#ifdef CONFIG_KMOD
	if ((ops = auth_flavors[flavor]) == NULL)
		request_module("rpc-auth-%u", flavor);
#endif
	if ((ops = auth_flavors[flavor]) == NULL)
		goto out;
	auth = ops->create(clnt, pseudoflavor);
	if (IS_ERR(auth))
		return auth;
	if (clnt->cl_auth)
		rpcauth_destroy(clnt->cl_auth);
	clnt->cl_auth = auth;

out:
	return auth;
}

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

static DEFINE_SPINLOCK(rpc_credcache_lock);

/*
 * Initialize RPC credential cache
 */
int
rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
{
	struct rpc_cred_cache *new;
	int i;

	new = kmalloc(sizeof(*new), GFP_KERNEL);
	if (!new)
		return -ENOMEM;
	for (i = 0; i < RPC_CREDCACHE_NR; i++)
		INIT_HLIST_HEAD(&new->hashtable[i]);
	new->expire = expire;
	new->nextgc = jiffies + (expire >> 1);
	auth->au_credcache = new;
	return 0;
}

/*
 * Destroy a list of credentials
 */
static inline
void rpcauth_destroy_credlist(struct hlist_head *head)
{
	struct rpc_cred *cred;

	while (!hlist_empty(head)) {
		cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
		hlist_del_init(&cred->cr_hash);
		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)
{
	HLIST_HEAD(free);
	struct hlist_node *pos, *next;
	struct rpc_cred	*cred;
	int		i;

	spin_lock(&rpc_credcache_lock);
	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
		hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
			cred = hlist_entry(pos, struct rpc_cred, cr_hash);
			__hlist_del(&cred->cr_hash);
			hlist_add_head(&cred->cr_hash, &free);
		}
	}
	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);
	}
}

static void
rpcauth_prune_expired(struct rpc_auth *auth, struct rpc_cred *cred, struct hlist_head *free)
{
	if (atomic_read(&cred->cr_count) != 1)
	       return;
	if (time_after(jiffies, cred->cr_expire + auth->au_credcache->expire))
		cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
	if (!(cred->cr_flags & RPCAUTH_CRED_UPTODATE)) {
		__hlist_del(&cred->cr_hash);
		hlist_add_head(&cred->cr_hash, free);
	}
}

/*
 * Remove stale credentials. Avoid sleeping inside the loop.
 */
static void
rpcauth_gc_credcache(struct rpc_auth *auth, struct hlist_head *free)
{
	struct rpc_cred_cache *cache = auth->au_credcache;
	struct hlist_node *pos, *next;
	struct rpc_cred	*cred;
	int		i;

	dprintk("RPC:       gc'ing RPC credentials for auth %p\n", auth);
	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
		hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
			cred = hlist_entry(pos, struct rpc_cred, cr_hash);
			rpcauth_prune_expired(auth, cred, free);
		}
	}
	cache->nextgc = jiffies + cache->expire;
}

/*
 * 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)
{
	struct rpc_cred_cache *cache = auth->au_credcache;
	HLIST_HEAD(free);
	struct hlist_node *pos, *next;
	struct rpc_cred	*new = NULL,
			*cred = NULL;
	int		nr = 0;

	if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS))
		nr = acred->uid & RPC_CREDCACHE_MASK;
retry:
	spin_lock(&rpc_credcache_lock);
	if (time_before(cache->nextgc, jiffies))
		rpcauth_gc_credcache(auth, &free);
	hlist_for_each_safe(pos, next, &cache->hashtable[nr]) {
		struct rpc_cred *entry;
		entry = hlist_entry(pos, struct rpc_cred, cr_hash);
		if (entry->cr_ops->crmatch(acred, entry, flags)) {
			hlist_del(&entry->cr_hash);
			cred = entry;
			break;
		}
		rpcauth_prune_expired(auth, entry, &free);
	}
	if (new) {
		if (cred)
			hlist_add_head(&new->cr_hash, &free);
		else
			cred = new;
	}
	if (cred) {
		hlist_add_head(&cred->cr_hash, &cache->hashtable[nr]);
		get_rpccred(cred);
	}
	spin_unlock(&rpc_credcache_lock);

	rpcauth_destroy_credlist(&free);

	if (!cred) {
		new = auth->au_ops->crcreate(auth, acred, flags);
		if (!IS_ERR(new)) {
#ifdef RPC_DEBUG
			new->cr_magic = RPCAUTH_CRED_MAGIC;
#endif
			goto retry;
		} else
			cred = new;
	} else if ((cred->cr_flags & RPCAUTH_CRED_NEW)
			&& 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);
		}
	}

	return (struct rpc_cred *) cred;
}

struct rpc_cred *
rpcauth_lookupcred(struct rpc_auth *auth, int flags)
{
	struct auth_cred acred = {
		.uid = current->fsuid,
		.gid = current->fsgid,
		.group_info = current->group_info,
	};
	struct rpc_cred *ret;

	dprintk("RPC:       looking up %s cred\n",
		auth->au_ops->au_name);
	get_group_info(acred.group_info);
	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
	put_group_info(acred.group_info);
	return ret;
}

struct rpc_cred *
rpcauth_bindcred(struct rpc_task *task)
{
	struct rpc_auth *auth = task->tk_auth;
	struct auth_cred acred = {
		.uid = current->fsuid,
		.gid = current->fsgid,
		.group_info = current->group_info,
	};
	struct rpc_cred *ret;
	int flags = 0;

	dprintk("RPC: %5u looking up %s cred\n",
		task->tk_pid, task->tk_auth->au_ops->au_name);
	get_group_info(acred.group_info);
	if (task->tk_flags & RPC_TASK_ROOTCREDS)
		flags |= RPCAUTH_LOOKUP_ROOTCREDS;
	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
	if (!IS_ERR(ret))
		task->tk_msg.rpc_cred = ret;
	else
		task->tk_status = PTR_ERR(ret);
	put_group_info(acred.group_info);
	return ret;
}

void
rpcauth_holdcred(struct rpc_task *task)
{
	dprintk("RPC: %5u holding %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name,
		task->tk_msg.rpc_cred);
	if (task->tk_msg.rpc_cred)
		get_rpccred(task->tk_msg.rpc_cred);
}

void
put_rpccred(struct rpc_cred *cred)
{
	cred->cr_expire = jiffies;
	if (!atomic_dec_and_test(&cred->cr_count))
		return;
	cred->cr_ops->crdestroy(cred);
}

void
rpcauth_unbindcred(struct rpc_task *task)
{
	struct rpc_cred	*cred = task->tk_msg.rpc_cred;

	dprintk("RPC: %5u releasing %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, cred);

	put_rpccred(cred);
	task->tk_msg.rpc_cred = NULL;
}

__be32 *
rpcauth_marshcred(struct rpc_task *task, __be32 *p)
{
	struct rpc_cred	*cred = task->tk_msg.rpc_cred;

	dprintk("RPC: %5u marshaling %s cred %p\n",
		task->tk_pid, task->tk_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_msg.rpc_cred;

	dprintk("RPC: %5u validating %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, cred);

	return cred->cr_ops->crvalidate(task, p);
}

int
rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp,
		__be32 *data, void *obj)
{
	struct rpc_cred *cred = task->tk_msg.rpc_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. */
	return encode(rqstp, data, obj);
}

int
rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
		__be32 *data, void *obj)
{
	struct rpc_cred *cred = task->tk_msg.rpc_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 decode(rqstp, data, obj);
}

int
rpcauth_refreshcred(struct rpc_task *task)
{
	struct rpc_cred	*cred = task->tk_msg.rpc_cred;
	int err;

	dprintk("RPC: %5u refreshing %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, cred);

	err = cred->cr_ops->crrefresh(task);
	if (err < 0)
		task->tk_status = err;
	return err;
}

void
rpcauth_invalcred(struct rpc_task *task)
{
	dprintk("RPC: %5u invalidating %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
	spin_lock(&rpc_credcache_lock);
	if (task->tk_msg.rpc_cred)
		task->tk_msg.rpc_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
	spin_unlock(&rpc_credcache_lock);
}

int
rpcauth_uptodatecred(struct rpc_task *task)
{
	return !(task->tk_msg.rpc_cred) ||
		(task->tk_msg.rpc_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
}
Commit	Line	Data
1da177e4 LT	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>
1da177e4 LT	14	#include <linux/sunrpc/clnt.h>
	15	#include <linux/spinlock.h>
	16
	17	#ifdef RPC_DEBUG
	18	# define RPCDBG_FACILITY RPCDBG_AUTH
	19	#endif
	20
	21	static struct rpc_authops * auth_flavors[RPC_AUTH_MAXFLAVOR] = {
	22	&authnull_ops, /* AUTH_NULL */
	23	&authunix_ops, /* AUTH_UNIX */
	24	NULL, /* others can be loadable modules */
	25	};
	26
	27	static u32
	28	pseudoflavor_to_flavor(u32 flavor) {
	29	if (flavor >= RPC_AUTH_MAXFLAVOR)
	30	return RPC_AUTH_GSS;
	31	return flavor;
	32	}
	33
	34	int
	35	rpcauth_register(struct rpc_authops *ops)
	36	{
	37	rpc_authflavor_t flavor;
	38
	39	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
	40	return -EINVAL;
	41	if (auth_flavors[flavor] != NULL)
	42	return -EPERM; /* what else? */
	43	auth_flavors[flavor] = ops;
	44	return 0;
	45	}
	46
	47	int
	48	rpcauth_unregister(struct rpc_authops *ops)
	49	{
	50	rpc_authflavor_t flavor;
	51
	52	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
	53	return -EINVAL;
	54	if (auth_flavors[flavor] != ops)
	55	return -EPERM; /* what else? */
	56	auth_flavors[flavor] = NULL;
	57	return 0;
	58	}
	59
	60	struct rpc_auth *
	61	rpcauth_create(rpc_authflavor_t pseudoflavor, struct rpc_clnt *clnt)
	62	{
	63	struct rpc_auth *auth;
	64	struct rpc_authops *ops;
	65	u32 flavor = pseudoflavor_to_flavor(pseudoflavor);
	66
f344f6df OK	67	auth = ERR_PTR(-EINVAL);
	68	if (flavor >= RPC_AUTH_MAXFLAVOR)
	69	goto out;
	70
	71	/* FIXME - auth_flavors[] really needs an rw lock,
	72	* and module refcounting. */
	73	#ifdef CONFIG_KMOD
	74	if ((ops = auth_flavors[flavor]) == NULL)
	75	request_module("rpc-auth-%u", flavor);
	76	#endif
	77	if ((ops = auth_flavors[flavor]) == NULL)
	78	goto out;
1da177e4	79	auth = ops->create(clnt, pseudoflavor);
6a19275a BF	80	if (IS_ERR(auth))
6a19275a BF	81	return auth;
1da177e4 LT	82	if (clnt->cl_auth)
	83	rpcauth_destroy(clnt->cl_auth);
	84	clnt->cl_auth = auth;
f344f6df OK	85
f344f6df OK	86	out:
1da177e4 LT	87	return auth;
	88	}
	89
	90	void
	91	rpcauth_destroy(struct rpc_auth *auth)
	92	{
	93	if (!atomic_dec_and_test(&auth->au_count))
	94	return;
	95	auth->au_ops->destroy(auth);
	96	}
	97
	98	static DEFINE_SPINLOCK(rpc_credcache_lock);
	99
	100	/*
	101	* Initialize RPC credential cache
	102	*/
	103	int
	104	rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
	105	{
	106	struct rpc_cred_cache *new;
	107	int i;
	108
8b3a7005	109	new = kmalloc(sizeof(*new), GFP_KERNEL);
1da177e4 LT	110	if (!new)
	111	return -ENOMEM;
	112	for (i = 0; i < RPC_CREDCACHE_NR; i++)
	113	INIT_HLIST_HEAD(&new->hashtable[i]);
	114	new->expire = expire;
	115	new->nextgc = jiffies + (expire >> 1);
	116	auth->au_credcache = new;
	117	return 0;
	118	}
	119
	120	/*
	121	* Destroy a list of credentials
	122	*/
	123	static inline
	124	void rpcauth_destroy_credlist(struct hlist_head *head)
	125	{
	126	struct rpc_cred *cred;
	127
	128	while (!hlist_empty(head)) {
	129	cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
	130	hlist_del_init(&cred->cr_hash);
	131	put_rpccred(cred);
	132	}
	133	}
	134
	135	/*
	136	* Clear the RPC credential cache, and delete those credentials
	137	* that are not referenced.
	138	*/
	139	void
3ab9bb72	140	rpcauth_clear_credcache(struct rpc_cred_cache *cache)
1da177e4	141	{
1da177e4 LT	142	HLIST_HEAD(free);
	143	struct hlist_node pos, next;
	144	struct rpc_cred *cred;
	145	int i;
	146
	147	spin_lock(&rpc_credcache_lock);
	148	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
	149	hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
	150	cred = hlist_entry(pos, struct rpc_cred, cr_hash);
	151	__hlist_del(&cred->cr_hash);
	152	hlist_add_head(&cred->cr_hash, &free);
	153	}
	154	}
	155	spin_unlock(&rpc_credcache_lock);
	156	rpcauth_destroy_credlist(&free);
	157	}
	158
3ab9bb72 TM	159	/*
	160	* Destroy the RPC credential cache
	161	*/
	162	void
	163	rpcauth_destroy_credcache(struct rpc_auth *auth)
	164	{
	165	struct rpc_cred_cache *cache = auth->au_credcache;
	166
	167	if (cache) {
	168	auth->au_credcache = NULL;
	169	rpcauth_clear_credcache(cache);
	170	kfree(cache);
	171	}
	172	}
	173
1da177e4 LT	174	static void
	175	rpcauth_prune_expired(struct rpc_auth auth, struct rpc_cred cred, struct hlist_head *free)
	176	{
	177	if (atomic_read(&cred->cr_count) != 1)
	178	return;
	179	if (time_after(jiffies, cred->cr_expire + auth->au_credcache->expire))
	180	cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
	181	if (!(cred->cr_flags & RPCAUTH_CRED_UPTODATE)) {
	182	__hlist_del(&cred->cr_hash);
	183	hlist_add_head(&cred->cr_hash, free);
	184	}
	185	}
	186
	187	/*
	188	* Remove stale credentials. Avoid sleeping inside the loop.
	189	*/
	190	static void
	191	rpcauth_gc_credcache(struct rpc_auth auth, struct hlist_head free)
	192	{
	193	struct rpc_cred_cache *cache = auth->au_credcache;
	194	struct hlist_node pos, next;
	195	struct rpc_cred *cred;
	196	int i;
	197
46121cf7	198	dprintk("RPC: gc'ing RPC credentials for auth %p\n", auth);
1da177e4 LT	199	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
	200	hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
	201	cred = hlist_entry(pos, struct rpc_cred, cr_hash);
	202	rpcauth_prune_expired(auth, cred, free);
	203	}
	204	}
	205	cache->nextgc = jiffies + cache->expire;
	206	}
	207
	208	/*
	209	* Look up a process' credentials in the authentication cache
	210	*/
	211	struct rpc_cred *
	212	rpcauth_lookup_credcache(struct rpc_auth auth, struct auth_cred acred,
8a317760	213	int flags)
1da177e4 LT	214	{
	215	struct rpc_cred_cache *cache = auth->au_credcache;
	216	HLIST_HEAD(free);
	217	struct hlist_node pos, next;
	218	struct rpc_cred *new = NULL,
	219	*cred = NULL;
	220	int nr = 0;
	221
8a317760	222	if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS))
1da177e4 LT	223	nr = acred->uid & RPC_CREDCACHE_MASK;
	224	retry:
	225	spin_lock(&rpc_credcache_lock);
	226	if (time_before(cache->nextgc, jiffies))
	227	rpcauth_gc_credcache(auth, &free);
	228	hlist_for_each_safe(pos, next, &cache->hashtable[nr]) {
	229	struct rpc_cred *entry;
cca5172a	230	entry = hlist_entry(pos, struct rpc_cred, cr_hash);
8a317760	231	if (entry->cr_ops->crmatch(acred, entry, flags)) {
1da177e4 LT	232	hlist_del(&entry->cr_hash);
	233	cred = entry;
	234	break;
	235	}
	236	rpcauth_prune_expired(auth, entry, &free);
	237	}
	238	if (new) {
	239	if (cred)
	240	hlist_add_head(&new->cr_hash, &free);
	241	else
	242	cred = new;
	243	}
	244	if (cred) {
	245	hlist_add_head(&cred->cr_hash, &cache->hashtable[nr]);
	246	get_rpccred(cred);
	247	}
	248	spin_unlock(&rpc_credcache_lock);
	249
	250	rpcauth_destroy_credlist(&free);
	251
	252	if (!cred) {
8a317760	253	new = auth->au_ops->crcreate(auth, acred, flags);
1da177e4 LT	254	if (!IS_ERR(new)) {
	255	#ifdef RPC_DEBUG
	256	new->cr_magic = RPCAUTH_CRED_MAGIC;
	257	#endif
	258	goto retry;
	259	} else
	260	cred = new;
fba3bad4 TM	261	} else if ((cred->cr_flags & RPCAUTH_CRED_NEW)
	262	&& cred->cr_ops->cr_init != NULL
	263	&& !(flags & RPCAUTH_LOOKUP_NEW)) {
	264	int res = cred->cr_ops->cr_init(auth, cred);
	265	if (res < 0) {
	266	put_rpccred(cred);
	267	cred = ERR_PTR(res);
	268	}
1da177e4 LT	269	}
	270
	271	return (struct rpc_cred *) cred;
	272	}
	273
	274	struct rpc_cred *
8a317760	275	rpcauth_lookupcred(struct rpc_auth *auth, int flags)
1da177e4 LT	276	{
	277	struct auth_cred acred = {
	278	.uid = current->fsuid,
	279	.gid = current->fsgid,
	280	.group_info = current->group_info,
	281	};
	282	struct rpc_cred *ret;
	283
46121cf7	284	dprintk("RPC: looking up %s cred\n",
1da177e4 LT	285	auth->au_ops->au_name);
1da177e4 LT	286	get_group_info(acred.group_info);
8a317760	287	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
1da177e4 LT	288	put_group_info(acred.group_info);
	289	return ret;
	290	}
	291
	292	struct rpc_cred *
	293	rpcauth_bindcred(struct rpc_task *task)
	294	{
	295	struct rpc_auth *auth = task->tk_auth;
	296	struct auth_cred acred = {
	297	.uid = current->fsuid,
	298	.gid = current->fsgid,
	299	.group_info = current->group_info,
	300	};
	301	struct rpc_cred *ret;
8a317760	302	int flags = 0;
1da177e4	303
46121cf7	304	dprintk("RPC: %5u looking up %s cred\n",
1da177e4 LT	305	task->tk_pid, task->tk_auth->au_ops->au_name);
1da177e4 LT	306	get_group_info(acred.group_info);
8a317760 TM	307	if (task->tk_flags & RPC_TASK_ROOTCREDS)
	308	flags \|= RPCAUTH_LOOKUP_ROOTCREDS;
	309	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
1da177e4 LT	310	if (!IS_ERR(ret))
	311	task->tk_msg.rpc_cred = ret;
	312	else
	313	task->tk_status = PTR_ERR(ret);
	314	put_group_info(acred.group_info);
	315	return ret;
	316	}
	317
	318	void
	319	rpcauth_holdcred(struct rpc_task *task)
	320	{
46121cf7 CL	321	dprintk("RPC: %5u holding %s cred %p\n",
	322	task->tk_pid, task->tk_auth->au_ops->au_name,
	323	task->tk_msg.rpc_cred);
1da177e4 LT	324	if (task->tk_msg.rpc_cred)
	325	get_rpccred(task->tk_msg.rpc_cred);
	326	}
	327
	328	void
	329	put_rpccred(struct rpc_cred *cred)
	330	{
	331	cred->cr_expire = jiffies;
	332	if (!atomic_dec_and_test(&cred->cr_count))
	333	return;
	334	cred->cr_ops->crdestroy(cred);
	335	}
	336
	337	void
	338	rpcauth_unbindcred(struct rpc_task *task)
	339	{
1da177e4 LT	340	struct rpc_cred *cred = task->tk_msg.rpc_cred;
1da177e4 LT	341
46121cf7	342	dprintk("RPC: %5u releasing %s cred %p\n",
0bbacc40	343	task->tk_pid, task->tk_auth->au_ops->au_name, cred);
1da177e4 LT	344
	345	put_rpccred(cred);
	346	task->tk_msg.rpc_cred = NULL;
	347	}
	348
d8ed029d AD	349	__be32 *
d8ed029d AD	350	rpcauth_marshcred(struct rpc_task task, __be32 p)
1da177e4	351	{
1da177e4 LT	352	struct rpc_cred *cred = task->tk_msg.rpc_cred;
1da177e4 LT	353
46121cf7	354	dprintk("RPC: %5u marshaling %s cred %p\n",
0bbacc40 CL	355	task->tk_pid, task->tk_auth->au_ops->au_name, cred);
0bbacc40 CL	356
1da177e4 LT	357	return cred->cr_ops->crmarshal(task, p);
	358	}
	359
d8ed029d AD	360	__be32 *
d8ed029d AD	361	rpcauth_checkverf(struct rpc_task task, __be32 p)
1da177e4	362	{
1da177e4 LT	363	struct rpc_cred *cred = task->tk_msg.rpc_cred;
1da177e4 LT	364
46121cf7	365	dprintk("RPC: %5u validating %s cred %p\n",
0bbacc40 CL	366	task->tk_pid, task->tk_auth->au_ops->au_name, cred);
0bbacc40 CL	367
1da177e4 LT	368	return cred->cr_ops->crvalidate(task, p);
	369	}
	370
	371	int
	372	rpcauth_wrap_req(struct rpc_task task, kxdrproc_t encode, void rqstp,
d8ed029d	373	__be32 data, void obj)
1da177e4 LT	374	{
	375	struct rpc_cred *cred = task->tk_msg.rpc_cred;
	376
46121cf7	377	dprintk("RPC: %5u using %s cred %p to wrap rpc data\n",
1da177e4 LT	378	task->tk_pid, cred->cr_ops->cr_name, cred);
	379	if (cred->cr_ops->crwrap_req)
	380	return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
	381	/* By default, we encode the arguments normally. */
	382	return encode(rqstp, data, obj);
	383	}
	384
	385	int
	386	rpcauth_unwrap_resp(struct rpc_task task, kxdrproc_t decode, void rqstp,
d8ed029d	387	__be32 data, void obj)
1da177e4 LT	388	{
	389	struct rpc_cred *cred = task->tk_msg.rpc_cred;
	390
46121cf7	391	dprintk("RPC: %5u using %s cred %p to unwrap rpc data\n",
1da177e4 LT	392	task->tk_pid, cred->cr_ops->cr_name, cred);
	393	if (cred->cr_ops->crunwrap_resp)
	394	return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
	395	data, obj);
	396	/* By default, we decode the arguments normally. */
	397	return decode(rqstp, data, obj);
	398	}
	399
	400	int
	401	rpcauth_refreshcred(struct rpc_task *task)
	402	{
1da177e4 LT	403	struct rpc_cred *cred = task->tk_msg.rpc_cred;
	404	int err;
	405
46121cf7	406	dprintk("RPC: %5u refreshing %s cred %p\n",
0bbacc40 CL	407	task->tk_pid, task->tk_auth->au_ops->au_name, cred);
0bbacc40 CL	408
1da177e4 LT	409	err = cred->cr_ops->crrefresh(task);
	410	if (err < 0)
	411	task->tk_status = err;
	412	return err;
	413	}
	414
	415	void
	416	rpcauth_invalcred(struct rpc_task *task)
	417	{
46121cf7	418	dprintk("RPC: %5u invalidating %s cred %p\n",
1da177e4 LT	419	task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
	420	spin_lock(&rpc_credcache_lock);
	421	if (task->tk_msg.rpc_cred)
	422	task->tk_msg.rpc_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
	423	spin_unlock(&rpc_credcache_lock);
	424	}
	425
	426	int
	427	rpcauth_uptodatecred(struct rpc_task *task)
	428	{
	429	return !(task->tk_msg.rpc_cred) \|\|
	430	(task->tk_msg.rpc_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
	431	}