Merge tag 'acpi-5.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[sfrench/cifs-2.6.git] / net / sunrpc / auth_null.c
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(&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(&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, 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, &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, 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 };