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
14#ifdef RPC_DEBUG
15# define RPCDBG_FACILITY	RPCDBG_AUTH
16#endif
17
18static struct rpc_auth null_auth;
19static struct rpc_cred null_cred;
20
21static struct rpc_auth *
22nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
23{
24	atomic_inc(&null_auth.au_count);
25	return &null_auth;
26}
27
28static void
29nul_destroy(struct rpc_auth *auth)
30{
31}
32
33/*
34 * Lookup NULL creds for current process
35 */
36static struct rpc_cred *
37nul_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 */
45static void
46nul_destroy_cred(struct rpc_cred *cred)
47{
48}
49
50/*
51 * Match cred handle against current process
52 */
53static int
54nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
55{
56	return 1;
57}
58
59/*
60 * Marshal credential.
61 */
62static __be32 *
63nul_marshal(struct rpc_task *task, __be32 *p)
64{
65	*p++ = htonl(RPC_AUTH_NULL);
66	*p++ = 0;
67	*p++ = htonl(RPC_AUTH_NULL);
68	*p++ = 0;
69
70	return p;
71}
72
73/*
74 * Refresh credential. This is a no-op for AUTH_NULL
75 */
76static int
77nul_refresh(struct rpc_task *task)
78{
79	task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
80	return 0;
81}
82
83static __be32 *
84nul_validate(struct rpc_task *task, __be32 *p)
85{
86	rpc_authflavor_t	flavor;
87	u32			size;
88
89	flavor = ntohl(*p++);
90	if (flavor != RPC_AUTH_NULL) {
91		printk("RPC: bad verf flavor: %u\n", flavor);
92		return NULL;
93	}
94
95	size = ntohl(*p++);
96	if (size != 0) {
97		printk("RPC: bad verf size: %u\n", size);
98		return NULL;
99	}
100
101	return p;
102}
103
104struct rpc_authops authnull_ops = {
105	.owner		= THIS_MODULE,
106	.au_flavor	= RPC_AUTH_NULL,
107#ifdef RPC_DEBUG
108	.au_name	= "NULL",
109#endif
110	.create		= nul_create,
111	.destroy	= nul_destroy,
112	.lookup_cred	= nul_lookup_cred,
113};
114
115static
116struct rpc_auth null_auth = {
117	.au_cslack	= 4,
118	.au_rslack	= 2,
119	.au_ops		= &authnull_ops,
120	.au_flavor	= RPC_AUTH_NULL,
121	.au_count	= ATOMIC_INIT(0),
122};
123
124static
125struct rpc_credops	null_credops = {
126	.cr_name	= "AUTH_NULL",
127	.crdestroy	= nul_destroy_cred,
128	.crmatch	= nul_match,
129	.crmarshal	= nul_marshal,
130	.crrefresh	= nul_refresh,
131	.crvalidate	= nul_validate,
132};
133
134static
135struct rpc_cred null_cred = {
136	.cr_ops		= &null_credops,
137	.cr_count	= ATOMIC_INIT(1),
138	.cr_flags	= RPCAUTH_CRED_UPTODATE,
139#ifdef RPC_DEBUG
140	.cr_magic	= RPCAUTH_CRED_MAGIC,
141#endif
142};
143