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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 
17 static struct rpc_auth null_auth;
18 static struct rpc_cred null_cred;
19 
20 static struct rpc_auth *
nul_create(struct rpc_auth_create_args * args,struct rpc_clnt * clnt)21 nul_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
22 {
23 	atomic_inc(&null_auth.au_count);
24 	return &null_auth;
25 }
26 
27 static void
nul_destroy(struct rpc_auth * auth)28 nul_destroy(struct rpc_auth *auth)
29 {
30 }
31 
32 /*
33  * Lookup NULL creds for current process
34  */
35 static struct rpc_cred *
nul_lookup_cred(struct rpc_auth * auth,struct auth_cred * acred,int flags)36 nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
37 {
38 	if (flags & RPCAUTH_LOOKUP_RCU)
39 		return &null_cred;
40 	return get_rpccred(&null_cred);
41 }
42 
43 /*
44  * Destroy cred handle.
45  */
46 static void
nul_destroy_cred(struct rpc_cred * cred)47 nul_destroy_cred(struct rpc_cred *cred)
48 {
49 }
50 
51 /*
52  * Match cred handle against current process
53  */
54 static int
nul_match(struct auth_cred * acred,struct rpc_cred * cred,int taskflags)55 nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
56 {
57 	return 1;
58 }
59 
60 /*
61  * Marshal credential.
62  */
63 static __be32 *
nul_marshal(struct rpc_task * task,__be32 * p)64 nul_marshal(struct rpc_task *task, __be32 *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  */
77 static int
nul_refresh(struct rpc_task * task)78 nul_refresh(struct rpc_task *task)
79 {
80 	set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
81 	return 0;
82 }
83 
84 static __be32 *
nul_validate(struct rpc_task * task,__be32 * p)85 nul_validate(struct rpc_task *task, __be32 *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 ERR_PTR(-EIO);
94 	}
95 
96 	size = ntohl(*p++);
97 	if (size != 0) {
98 		printk("RPC: bad verf size: %u\n", size);
99 		return ERR_PTR(-EIO);
100 	}
101 
102 	return p;
103 }
104 
105 const struct rpc_authops authnull_ops = {
106 	.owner		= THIS_MODULE,
107 	.au_flavor	= RPC_AUTH_NULL,
108 	.au_name	= "NULL",
109 	.create		= nul_create,
110 	.destroy	= nul_destroy,
111 	.lookup_cred	= nul_lookup_cred,
112 };
113 
114 static
115 struct rpc_auth null_auth = {
116 	.au_cslack	= 4,
117 	.au_rslack	= 2,
118 	.au_ops		= &authnull_ops,
119 	.au_flavor	= RPC_AUTH_NULL,
120 	.au_count	= ATOMIC_INIT(0),
121 };
122 
123 static
124 const struct rpc_credops null_credops = {
125 	.cr_name	= "AUTH_NULL",
126 	.crdestroy	= nul_destroy_cred,
127 	.crbind		= rpcauth_generic_bind_cred,
128 	.crmatch	= nul_match,
129 	.crmarshal	= nul_marshal,
130 	.crrefresh	= nul_refresh,
131 	.crvalidate	= nul_validate,
132 };
133 
134 static
135 struct rpc_cred null_cred = {
136 	.cr_lru		= LIST_HEAD_INIT(null_cred.cr_lru),
137 	.cr_auth	= &null_auth,
138 	.cr_ops		= &null_credops,
139 	.cr_count	= ATOMIC_INIT(1),
140 	.cr_flags	= 1UL << RPCAUTH_CRED_UPTODATE,
141 #ifdef RPC_DEBUG
142 	.cr_magic	= RPCAUTH_CRED_MAGIC,
143 #endif
144 };
145