[mirror_ubuntu-bionic-kernel.git] / net / sunrpc / auth_null.c

// SPDX-License-Identifier: GPL-2.0
/*
 * linux/net/sunrpc/auth_null.c
 *
 * AUTH_NULL authentication. Really :-)
 *
 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/sunrpc/clnt.h>

#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
# define RPCDBG_FACILITY	RPCDBG_AUTH
#endif

static struct rpc_auth null_auth;
static struct rpc_cred null_cred;

static struct rpc_auth *
nul_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
{
	atomic_inc(&null_auth.au_count);
	return &null_auth;
}

static void
nul_destroy(struct rpc_auth *auth)
{
}

/*
 * Lookup NULL creds for current process
 */
static struct rpc_cred *
nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
{
	if (flags & RPCAUTH_LOOKUP_RCU)
		return &null_cred;
	return get_rpccred(&null_cred);
}

/*
 * Destroy cred handle.
 */
static void
nul_destroy_cred(struct rpc_cred *cred)
{
}

/*
 * Match cred handle against current process
 */
static int
nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
{
	return 1;
}

/*
 * Marshal credential.
 */
static __be32 *
nul_marshal(struct rpc_task *task, __be32 *p)
{
	*p++ = htonl(RPC_AUTH_NULL);
	*p++ = 0;
	*p++ = htonl(RPC_AUTH_NULL);
	*p++ = 0;

	return p;
}

/*
 * Refresh credential. This is a no-op for AUTH_NULL
 */
static int
nul_refresh(struct rpc_task *task)
{
	set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
	return 0;
}

static __be32 *
nul_validate(struct rpc_task *task, __be32 *p)
{
	rpc_authflavor_t	flavor;
	u32			size;

	flavor = ntohl(*p++);
	if (flavor != RPC_AUTH_NULL) {
		printk("RPC: bad verf flavor: %u\n", flavor);
		return ERR_PTR(-EIO);
	}

	size = ntohl(*p++);
	if (size != 0) {
		printk("RPC: bad verf size: %u\n", size);
		return ERR_PTR(-EIO);
	}

	return p;
}

const struct rpc_authops authnull_ops = {
	.owner		= THIS_MODULE,
	.au_flavor	= RPC_AUTH_NULL,
	.au_name	= "NULL",
	.create		= nul_create,
	.destroy	= nul_destroy,
	.lookup_cred	= nul_lookup_cred,
};

static
struct rpc_auth null_auth = {
	.au_cslack	= NUL_CALLSLACK,
	.au_rslack	= NUL_REPLYSLACK,
	.au_flags	= RPCAUTH_AUTH_NO_CRKEY_TIMEOUT,
	.au_ops		= &authnull_ops,
	.au_flavor	= RPC_AUTH_NULL,
	.au_count	= ATOMIC_INIT(0),
};

static
const struct rpc_credops null_credops = {
	.cr_name	= "AUTH_NULL",
	.crdestroy	= nul_destroy_cred,
	.crbind		= rpcauth_generic_bind_cred,
	.crmatch	= nul_match,
	.crmarshal	= nul_marshal,
	.crrefresh	= nul_refresh,
	.crvalidate	= nul_validate,
};

static
struct rpc_cred null_cred = {
	.cr_lru		= LIST_HEAD_INIT(null_cred.cr_lru),
	.cr_auth	= &null_auth,
	.cr_ops		= &null_credops,
	.cr_count	= ATOMIC_INIT(1),
	.cr_flags	= 1UL << RPCAUTH_CRED_UPTODATE,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/net/sunrpc/auth_null.c
	4	*
	5	* AUTH_NULL authentication. Really :-)
	6	*
	7	* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
	8	*/
	9
	10	#include <linux/types.h>
1da177e4	11	#include <linux/module.h>
1da177e4	12	#include <linux/sunrpc/clnt.h>
1da177e4	13
f895b252	14	#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
1da177e4 LT	15	# define RPCDBG_FACILITY RPCDBG_AUTH
	16	#endif
	17
	18	static struct rpc_auth null_auth;
	19	static struct rpc_cred null_cred;
	20
	21	static struct rpc_auth *
c2190661	22	nul_create(struct rpc_auth_create_args args, struct rpc_clnt clnt)
1da177e4 LT	23	{
	24	atomic_inc(&null_auth.au_count);
	25	return &null_auth;
	26	}
	27
	28	static void
	29	nul_destroy(struct rpc_auth *auth)
	30	{
	31	}
	32
	33	/*
	34	* Lookup NULL creds for current process
	35	*/
	36	static struct rpc_cred *
	37	nul_lookup_cred(struct rpc_auth auth, struct auth_cred acred, int flags)
	38	{
bd956080 N	39	if (flags & RPCAUTH_LOOKUP_RCU)
bd956080 N	40	return &null_cred;
1da177e4 LT	41	return get_rpccred(&null_cred);
	42	}
	43
	44	/*
	45	* Destroy cred handle.
	46	*/
	47	static void
	48	nul_destroy_cred(struct rpc_cred *cred)
	49	{
	50	}
	51
	52	/*
	53	* Match cred handle against current process
	54	*/
	55	static int
	56	nul_match(struct auth_cred acred, struct rpc_cred cred, int taskflags)
	57	{
	58	return 1;
	59	}
	60
	61	/*
	62	* Marshal credential.
	63	*/
d8ed029d AD	64	static __be32 *
d8ed029d AD	65	nul_marshal(struct rpc_task task, __be32 p)
1da177e4 LT	66	{
	67	*p++ = htonl(RPC_AUTH_NULL);
	68	*p++ = 0;
	69	*p++ = htonl(RPC_AUTH_NULL);
	70	*p++ = 0;
	71
	72	return p;
	73	}
	74
	75	/*
	76	* Refresh credential. This is a no-op for AUTH_NULL
	77	*/
	78	static int
	79	nul_refresh(struct rpc_task *task)
	80	{
a17c2153	81	set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
1da177e4 LT	82	return 0;
	83	}
	84
d8ed029d AD	85	static __be32 *
d8ed029d AD	86	nul_validate(struct rpc_task task, __be32 p)
1da177e4 LT	87	{
	88	rpc_authflavor_t flavor;
	89	u32 size;
	90
	91	flavor = ntohl(*p++);
	92	if (flavor != RPC_AUTH_NULL) {
	93	printk("RPC: bad verf flavor: %u\n", flavor);
35fa5f7b	94	return ERR_PTR(-EIO);
1da177e4 LT	95	}
	96
	97	size = ntohl(*p++);
	98	if (size != 0) {
	99	printk("RPC: bad verf size: %u\n", size);
35fa5f7b	100	return ERR_PTR(-EIO);
1da177e4 LT	101	}
	102
	103	return p;
	104	}
	105
f1c0a861	106	const struct rpc_authops authnull_ops = {
1da177e4 LT	107	.owner = THIS_MODULE,
1da177e4 LT	108	.au_flavor = RPC_AUTH_NULL,
1da177e4	109	.au_name = "NULL",
1da177e4 LT	110	.create = nul_create,
	111	.destroy = nul_destroy,
	112	.lookup_cred = nul_lookup_cred,
	113	};
	114
	115	static
	116	struct rpc_auth null_auth = {
4500632f CL	117	.au_cslack = NUL_CALLSLACK,
4500632f CL	118	.au_rslack = NUL_REPLYSLACK,
ce52914e	119	.au_flags = RPCAUTH_AUTH_NO_CRKEY_TIMEOUT,
1da177e4	120	.au_ops = &authnull_ops,
81039f1f TM	121	.au_flavor = RPC_AUTH_NULL,
81039f1f TM	122	.au_count = ATOMIC_INIT(0),
1da177e4 LT	123	};
	124
	125	static
f1c0a861	126	const struct rpc_credops null_credops = {
1da177e4 LT	127	.cr_name = "AUTH_NULL",
1da177e4 LT	128	.crdestroy = nul_destroy_cred,
5c691044	129	.crbind = rpcauth_generic_bind_cred,
1da177e4 LT	130	.crmatch = nul_match,
	131	.crmarshal = nul_marshal,
	132	.crrefresh = nul_refresh,
	133	.crvalidate = nul_validate,
	134	};
	135
	136	static
	137	struct rpc_cred null_cred = {
e092bdcd	138	.cr_lru = LIST_HEAD_INIT(null_cred.cr_lru),
4a8c1344	139	.cr_auth = &null_auth,
1da177e4 LT	140	.cr_ops = &null_credops,
1da177e4 LT	141	.cr_count = ATOMIC_INIT(1),
fc432dd9	142	.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE,
1da177e4	143	};