1 | // SPDX-License-Identifier: GPL-2.0 |
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> |
11 | #include <linux/module.h> |
12 | #include <linux/sunrpc/clnt.h> |
13 | |
14 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
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 * |
22 | nul_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt) |
23 | { |
24 | refcount_inc(r: &null_auth.au_count); |
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(cred: &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 | */ |
62 | static int |
63 | nul_marshal(struct rpc_task *task, struct xdr_stream *xdr) |
64 | { |
65 | __be32 *p; |
66 | |
67 | p = xdr_reserve_space(xdr, nbytes: 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; |
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 | { |
85 | set_bit(RPCAUTH_CRED_UPTODATE, addr: &task->tk_rqstp->rq_cred->cr_flags); |
86 | return 0; |
87 | } |
88 | |
89 | static int |
90 | nul_validate(struct rpc_task *task, struct xdr_stream *xdr) |
91 | { |
92 | __be32 *p; |
93 | |
94 | p = xdr_inline_decode(xdr, nbytes: 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; |
102 | } |
103 | |
104 | const struct rpc_authops authnull_ops = { |
105 | .owner = THIS_MODULE, |
106 | .au_flavor = RPC_AUTH_NULL, |
107 | .au_name = "NULL" , |
108 | .create = nul_create, |
109 | .destroy = nul_destroy, |
110 | .lookup_cred = nul_lookup_cred, |
111 | }; |
112 | |
113 | static |
114 | struct rpc_auth null_auth = { |
115 | .au_cslack = NUL_CALLSLACK, |
116 | .au_rslack = NUL_REPLYSLACK, |
117 | .au_verfsize = NUL_REPLYSLACK, |
118 | .au_ralign = NUL_REPLYSLACK, |
119 | .au_ops = &authnull_ops, |
120 | .au_flavor = RPC_AUTH_NULL, |
121 | .au_count = REFCOUNT_INIT(1), |
122 | }; |
123 | |
124 | static |
125 | const struct rpc_credops null_credops = { |
126 | .cr_name = "AUTH_NULL" , |
127 | .crdestroy = nul_destroy_cred, |
128 | .crmatch = nul_match, |
129 | .crmarshal = nul_marshal, |
130 | .crwrap_req = rpcauth_wrap_req_encode, |
131 | .crrefresh = nul_refresh, |
132 | .crvalidate = nul_validate, |
133 | .crunwrap_resp = rpcauth_unwrap_resp_decode, |
134 | }; |
135 | |
136 | static |
137 | struct rpc_cred null_cred = { |
138 | .cr_lru = LIST_HEAD_INIT(null_cred.cr_lru), |
139 | .cr_auth = &null_auth, |
140 | .cr_ops = &null_credops, |
141 | .cr_count = REFCOUNT_INIT(2), |
142 | .cr_flags = 1UL << RPCAUTH_CRED_UPTODATE, |
143 | }; |
144 | |