auth_null.c revision 81039f1f204a0fd2952112a240284e114f1a25e6 
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/utsname.h>
12#include <linux/sunrpc/clnt.h>
13#include <linux/sched.h>
14
15#ifdef RPC_DEBUG
16# define RPCDBG_FACILITY	RPCDBG_AUTH
17#endif
18
19static struct rpc_auth null_auth;
20static struct rpc_cred null_cred;
21
22static struct rpc_auth *
23nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
24{
25	atomic_inc(&null_auth.au_count);
26	return &null_auth;
27}
28
29static void
30nul_destroy(struct rpc_auth *auth)
31{
32}
33
34/*
35 * Lookup NULL creds for current process
36 */
37static struct rpc_cred *
38nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
39{
40	return get_rpccred(&null_cred);
41}
42
43/*
44 * Destroy cred handle.
45 */
46static void
47nul_destroy_cred(struct rpc_cred *cred)
48{
49}
50
51/*
52 * Match cred handle against current process
53 */
54static int
55nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
56{
57	return 1;
58}
59
60/*
61 * Marshal credential.
62 */
63static u32 *
64nul_marshal(struct rpc_task *task, u32 *p)
65{
66	*p++ = htonl(RPC_AUTH_NULL);
67	*p++ = 0;
68	*p++ = htonl(RPC_AUTH_NULL);
69	*p++ = 0;
70
71	return p;
72}
73
74/*
75 * Refresh credential. This is a no-op for AUTH_NULL
76 */
77static int
78nul_refresh(struct rpc_task *task)
79{
80	task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
81	return 0;
82}
83
84static u32 *
85nul_validate(struct rpc_task *task, u32 *p)
86{
87	rpc_authflavor_t	flavor;
88	u32			size;
89
90	flavor = ntohl(*p++);
91	if (flavor != RPC_AUTH_NULL) {
92		printk("RPC: bad verf flavor: %u\n", flavor);
93		return NULL;
94	}
95
96	size = ntohl(*p++);
97	if (size != 0) {
98		printk("RPC: bad verf size: %u\n", size);
99		return NULL;
100	}
101
102	return p;
103}
104
105struct rpc_authops authnull_ops = {
106	.owner		= THIS_MODULE,
107	.au_flavor	= RPC_AUTH_NULL,
108#ifdef RPC_DEBUG
109	.au_name	= "NULL",
110#endif
111	.create		= nul_create,
112	.destroy	= nul_destroy,
113	.lookup_cred	= nul_lookup_cred,
114};
115
116static
117struct rpc_auth null_auth = {
118	.au_cslack	= 4,
119	.au_rslack	= 2,
120	.au_ops		= &authnull_ops,
121	.au_flavor	= RPC_AUTH_NULL,
122	.au_count	= ATOMIC_INIT(0),
123};
124
125static
126struct rpc_credops	null_credops = {
127	.cr_name	= "AUTH_NULL",
128	.crdestroy	= nul_destroy_cred,
129	.crmatch	= nul_match,
130	.crmarshal	= nul_marshal,
131	.crrefresh	= nul_refresh,
132	.crvalidate	= nul_validate,
133};
134
135static
136struct rpc_cred null_cred = {
137	.cr_ops		= &null_credops,
138	.cr_count	= ATOMIC_INIT(1),
139	.cr_flags	= RPCAUTH_CRED_UPTODATE,
140#ifdef RPC_DEBUG
141	.cr_magic	= RPCAUTH_CRED_MAGIC,
142#endif
143};
144