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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 * |
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 |
28 | nul_destroy(struct rpc_auth *auth) |
29 | { |
30 | } |
31 | |
32 | /* |
33 | * Lookup NULL creds for current process |
34 | */ |
35 | static struct rpc_cred * |
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 |
45 | nul_destroy_cred(struct rpc_cred *cred) |
46 | { |
47 | } |
48 | |
49 | /* |
50 | * Match cred handle against current process |
51 | */ |
52 | static int |
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 * |
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 |
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 * |
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 |
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