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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
18static struct rpc_auth null_auth;
19static struct rpc_cred null_cred;
20
21static struct rpc_auth *
22nul_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
23{
24 atomic_inc(&null_auth.au_count);
25 return &null_auth;
26}
27
28static void
29nul_destroy(struct rpc_auth *auth)
30{
31}
32
33/*
34 * Lookup NULL creds for current process
35 */
36static struct rpc_cred *
37nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
38{
39 if (flags & RPCAUTH_LOOKUP_RCU)
40 return &null_cred;
41 return get_rpccred(&null_cred);
42}
43
44/*
45 * Destroy cred handle.
46 */
47static void
48nul_destroy_cred(struct rpc_cred *cred)
49{
50}
51
52/*
53 * Match cred handle against current process
54 */
55static int
56nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
57{
58 return 1;
59}
60
61/*
62 * Marshal credential.
63 */
64static __be32 *
65nul_marshal(struct rpc_task *task, __be32 *p)
66{
67 *p++ = htonl(RPC_AUTH_NULL);
68 *p++ = 0;
69 *p++ = htonl(RPC_AUTH_NULL);
70 *p++ = 0;
71
72 return p;
73}
74
75/*
76 * Refresh credential. This is a no-op for AUTH_NULL
77 */
78static int
79nul_refresh(struct rpc_task *task)
80{
81 set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
82 return 0;
83}
84
85static __be32 *
86nul_validate(struct rpc_task *task, __be32 *p)
87{
88 rpc_authflavor_t flavor;
89 u32 size;
90
91 flavor = ntohl(*p++);
92 if (flavor != RPC_AUTH_NULL) {
93 printk("RPC: bad verf flavor: %u\n", flavor);
94 return ERR_PTR(-EIO);
95 }
96
97 size = ntohl(*p++);
98 if (size != 0) {
99 printk("RPC: bad verf size: %u\n", size);
100 return ERR_PTR(-EIO);
101 }
102
103 return p;
104}
105
106const struct rpc_authops authnull_ops = {
107 .owner = THIS_MODULE,
108 .au_flavor = RPC_AUTH_NULL,
109 .au_name = "NULL",
110 .create = nul_create,
111 .destroy = nul_destroy,
112 .lookup_cred = nul_lookup_cred,
113};
114
115static
116struct rpc_auth null_auth = {
117 .au_cslack = NUL_CALLSLACK,
118 .au_rslack = NUL_REPLYSLACK,
119 .au_flags = RPCAUTH_AUTH_NO_CRKEY_TIMEOUT,
120 .au_ops = &authnull_ops,
121 .au_flavor = RPC_AUTH_NULL,
122 .au_count = ATOMIC_INIT(0),
123};
124
125static
126const struct rpc_credops null_credops = {
127 .cr_name = "AUTH_NULL",
128 .crdestroy = nul_destroy_cred,
129 .crbind = rpcauth_generic_bind_cred,
130 .crmatch = nul_match,
131 .crmarshal = nul_marshal,
132 .crrefresh = nul_refresh,
133 .crvalidate = nul_validate,
134};
135
136static
137struct 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 = ATOMIC_INIT(1),
142 .cr_flags = 1UL << RPCAUTH_CRED_UPTODATE,
143};