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