[linux-block.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(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
{
	refcount_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)
{
	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 int
nul_marshal(struct rpc_task *task, struct xdr_stream *xdr)
{
	__be32 *p;

	p = xdr_reserve_space(xdr, 4 * sizeof(*p));
	if (!p)
		return -EMSGSIZE;
	/* Credential */
	*p++ = rpc_auth_null;
	*p++ = xdr_zero;
	/* Verifier */
	*p++ = rpc_auth_null;
	*p   = xdr_zero;
	return 0;
}

/*
 * 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 int
nul_validate(struct rpc_task *task, struct xdr_stream *xdr)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 2 * sizeof(*p));
	if (!p)
		return -EIO;
	if (*p++ != rpc_auth_null)
		return -EIO;
	if (*p != xdr_zero)
		return -EIO;
	return 0;
}

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_verfsize	= NUL_REPLYSLACK,
	.au_ralign	= NUL_REPLYSLACK,
	.au_ops		= &authnull_ops,
	.au_flavor	= RPC_AUTH_NULL,
	.au_count	= REFCOUNT_INIT(1),
};

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

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	= REFCOUNT_INIT(2),
	.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 *
82b98ca5	22	nul_create(const struct rpc_auth_create_args args, struct rpc_clnt clnt)
1da177e4	23	{
331bc71c	24	refcount_inc(&null_auth.au_count);
1da177e4 LT	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	{
	39	return get_rpccred(&null_cred);
	40	}
	41
	42	/*
	43	* Destroy cred handle.
	44	*/
	45	static void
	46	nul_destroy_cred(struct rpc_cred *cred)
	47	{
	48	}
	49
	50	/*
	51	* Match cred handle against current process
	52	*/
	53	static int
	54	nul_match(struct auth_cred acred, struct rpc_cred cred, int taskflags)
	55	{
	56	return 1;
	57	}
	58
	59	/*
	60	* Marshal credential.
	61	*/
e8680a24 CL	62	static int
e8680a24 CL	63	nul_marshal(struct rpc_task task, struct xdr_stream xdr)
1da177e4	64	{
e8680a24 CL	65	__be32 *p;
	66
	67	p = xdr_reserve_space(xdr, 4 * sizeof(*p));
	68	if (!p)
	69	return -EMSGSIZE;
	70	/* Credential */
	71	*p++ = rpc_auth_null;
	72	*p++ = xdr_zero;
	73	/* Verifier */
	74	*p++ = rpc_auth_null;
	75	*p = xdr_zero;
	76	return 0;
1da177e4 LT	77	}
	78
	79	/*
	80	* Refresh credential. This is a no-op for AUTH_NULL
	81	*/
	82	static int
	83	nul_refresh(struct rpc_task *task)
	84	{
a17c2153	85	set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
1da177e4 LT	86	return 0;
	87	}
	88
a0584ee9 CL	89	static int
a0584ee9 CL	90	nul_validate(struct rpc_task task, struct xdr_stream xdr)
1da177e4	91	{
a0584ee9 CL	92	__be32 *p;
	93
	94	p = xdr_inline_decode(xdr, 2 * sizeof(*p));
	95	if (!p)
	96	return -EIO;
	97	if (*p++ != rpc_auth_null)
	98	return -EIO;
	99	if (*p != xdr_zero)
	100	return -EIO;
	101	return 0;
1da177e4 LT	102	}
1da177e4 LT	103
f1c0a861	104	const struct rpc_authops authnull_ops = {
1da177e4 LT	105	.owner = THIS_MODULE,
1da177e4 LT	106	.au_flavor = RPC_AUTH_NULL,
1da177e4	107	.au_name = "NULL",
1da177e4 LT	108	.create = nul_create,
	109	.destroy = nul_destroy,
	110	.lookup_cred = nul_lookup_cred,
	111	};
	112
	113	static
	114	struct rpc_auth null_auth = {
4500632f CL	115	.au_cslack = NUL_CALLSLACK,
4500632f CL	116	.au_rslack = NUL_REPLYSLACK,
a00275ba	117	.au_verfsize = NUL_REPLYSLACK,
35e77d21	118	.au_ralign = NUL_REPLYSLACK,
1da177e4	119	.au_ops = &authnull_ops,
81039f1f	120	.au_flavor = RPC_AUTH_NULL,
331bc71c	121	.au_count = REFCOUNT_INIT(1),
1da177e4 LT	122	};
	123
	124	static
f1c0a861	125	const struct rpc_credops null_credops = {
1da177e4 LT	126	.cr_name = "AUTH_NULL",
	127	.crdestroy = nul_destroy_cred,
	128	.crmatch = nul_match,
	129	.crmarshal = nul_marshal,
e8680a24	130	.crwrap_req = rpcauth_wrap_req_encode,
1da177e4 LT	131	.crrefresh = nul_refresh,
1da177e4 LT	132	.crvalidate = nul_validate,
a0584ee9	133	.crunwrap_resp = rpcauth_unwrap_resp_decode,
1da177e4 LT	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	140	.cr_ops = &null_credops,
79b18181	141	.cr_count = REFCOUNT_INIT(2),
fc432dd9	142	.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE,
1da177e4	143	};