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_clnt * clnt,rpc_authflavor_t flavor)21 nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
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 return get_rpccred(&null_cred);
39 }
40
41 /*
42 * Destroy cred handle.
43 */
44 static void
nul_destroy_cred(struct rpc_cred * cred)45 nul_destroy_cred(struct rpc_cred *cred)
46 {
47 }
48
49 /*
50 * Match cred handle against current process
51 */
52 static int
nul_match(struct auth_cred * acred,struct rpc_cred * cred,int taskflags)53 nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
54 {
55 return 1;
56 }
57
58 /*
59 * Marshal credential.
60 */
61 static __be32 *
nul_marshal(struct rpc_task * task,__be32 * p)62 nul_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 */
75 static int
nul_refresh(struct rpc_task * task)76 nul_refresh(struct rpc_task *task)
77 {
78 set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
79 return 0;
80 }
81
82 static __be32 *
nul_validate(struct rpc_task * task,__be32 * p)83 nul_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
103 const 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
112 static
113 struct 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
121 static
122 const 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
132 static
133 struct 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 };
143