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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/net/sunrpc/auth_null.c | |
4 | * | |
5 | * AUTH_NULL authentication. Really :-) | |
6 | * | |
7 | * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> | |
8 | */ | |
9 | ||
10 | #include <linux/types.h> | |
1da177e4 | 11 | #include <linux/module.h> |
1da177e4 | 12 | #include <linux/sunrpc/clnt.h> |
1da177e4 | 13 | |
f895b252 | 14 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
15 | # define RPCDBG_FACILITY RPCDBG_AUTH |
16 | #endif | |
17 | ||
18 | static struct rpc_auth null_auth; | |
19 | static struct rpc_cred null_cred; | |
20 | ||
21 | static struct rpc_auth * | |
82b98ca5 | 22 | nul_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
1da177e4 | 23 | { |
331bc71c | 24 | refcount_inc(&null_auth.au_count); |
1da177e4 LT |
25 | return &null_auth; |
26 | } | |
27 | ||
28 | static void | |
29 | nul_destroy(struct rpc_auth *auth) | |
30 | { | |
31 | } | |
32 | ||
33 | /* | |
34 | * Lookup NULL creds for current process | |
35 | */ | |
36 | static struct rpc_cred * | |
37 | nul_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 | */ | |
45 | static void | |
46 | nul_destroy_cred(struct rpc_cred *cred) | |
47 | { | |
48 | } | |
49 | ||
50 | /* | |
51 | * Match cred handle against current process | |
52 | */ | |
53 | static int | |
54 | nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags) | |
55 | { | |
56 | return 1; | |
57 | } | |
58 | ||
59 | /* | |
60 | * Marshal credential. | |
61 | */ | |
e8680a24 CL |
62 | static int |
63 | nul_marshal(struct rpc_task *task, struct xdr_stream *xdr) | |
1da177e4 | 64 | { |
e8680a24 CL |
65 | __be32 *p; |
66 | ||
67 | p = xdr_reserve_space(xdr, 4 * sizeof(*p)); | |
68 | if (!p) | |
69 | return -EMSGSIZE; | |
70 | /* Credential */ | |
71 | *p++ = rpc_auth_null; | |
72 | *p++ = xdr_zero; | |
73 | /* Verifier */ | |
74 | *p++ = rpc_auth_null; | |
75 | *p = xdr_zero; | |
76 | return 0; | |
1da177e4 LT |
77 | } |
78 | ||
79 | /* | |
80 | * Refresh credential. This is a no-op for AUTH_NULL | |
81 | */ | |
82 | static int | |
83 | nul_refresh(struct rpc_task *task) | |
84 | { | |
a17c2153 | 85 | set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags); |
1da177e4 LT |
86 | return 0; |
87 | } | |
88 | ||
a0584ee9 CL |
89 | static int |
90 | nul_validate(struct rpc_task *task, struct xdr_stream *xdr) | |
1da177e4 | 91 | { |
a0584ee9 CL |
92 | __be32 *p; |
93 | ||
94 | p = xdr_inline_decode(xdr, 2 * sizeof(*p)); | |
95 | if (!p) | |
96 | return -EIO; | |
97 | if (*p++ != rpc_auth_null) | |
98 | return -EIO; | |
99 | if (*p != xdr_zero) | |
100 | return -EIO; | |
101 | return 0; | |
1da177e4 LT |
102 | } |
103 | ||
f1c0a861 | 104 | const struct rpc_authops authnull_ops = { |
1da177e4 LT |
105 | .owner = THIS_MODULE, |
106 | .au_flavor = RPC_AUTH_NULL, | |
1da177e4 | 107 | .au_name = "NULL", |
1da177e4 LT |
108 | .create = nul_create, |
109 | .destroy = nul_destroy, | |
110 | .lookup_cred = nul_lookup_cred, | |
111 | }; | |
112 | ||
113 | static | |
114 | struct rpc_auth null_auth = { | |
4500632f CL |
115 | .au_cslack = NUL_CALLSLACK, |
116 | .au_rslack = NUL_REPLYSLACK, | |
a00275ba | 117 | .au_verfsize = NUL_REPLYSLACK, |
35e77d21 | 118 | .au_ralign = NUL_REPLYSLACK, |
1da177e4 | 119 | .au_ops = &authnull_ops, |
81039f1f | 120 | .au_flavor = RPC_AUTH_NULL, |
331bc71c | 121 | .au_count = REFCOUNT_INIT(1), |
1da177e4 LT |
122 | }; |
123 | ||
124 | static | |
f1c0a861 | 125 | const struct rpc_credops null_credops = { |
1da177e4 LT |
126 | .cr_name = "AUTH_NULL", |
127 | .crdestroy = nul_destroy_cred, | |
128 | .crmatch = nul_match, | |
129 | .crmarshal = nul_marshal, | |
e8680a24 | 130 | .crwrap_req = rpcauth_wrap_req_encode, |
1da177e4 LT |
131 | .crrefresh = nul_refresh, |
132 | .crvalidate = nul_validate, | |
a0584ee9 | 133 | .crunwrap_resp = rpcauth_unwrap_resp_decode, |
1da177e4 LT |
134 | }; |
135 | ||
136 | static | |
137 | struct rpc_cred null_cred = { | |
e092bdcd | 138 | .cr_lru = LIST_HEAD_INIT(null_cred.cr_lru), |
4a8c1344 | 139 | .cr_auth = &null_auth, |
1da177e4 | 140 | .cr_ops = &null_credops, |
79b18181 | 141 | .cr_count = REFCOUNT_INIT(2), |
fc432dd9 | 142 | .cr_flags = 1UL << RPCAUTH_CRED_UPTODATE, |
1da177e4 | 143 | }; |