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 *
nul_create(struct rpc_auth_create_args * args,struct rpc_clnt * clnt)21 nul_create(struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
22 {
23 atomic_inc(&null_auth.au_count);
24 return &null_auth;
25 }
26
27 static void
nul_destroy(struct rpc_auth * auth)28 nul_destroy(struct rpc_auth *auth)
29 {
30 }
31
32 /*
33 * Lookup NULL creds for current process
34 */
35 static struct rpc_cred *
nul_lookup_cred(struct rpc_auth * auth,struct auth_cred * acred,int flags)36 nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
37 {
38 if (flags & RPCAUTH_LOOKUP_RCU)
39 return &null_cred;
40 return get_rpccred(&null_cred);
41 }
42
43 /*
44 * Destroy cred handle.
45 */
46 static void
nul_destroy_cred(struct rpc_cred * cred)47 nul_destroy_cred(struct rpc_cred *cred)
48 {
49 }
50
51 /*
52 * Match cred handle against current process
53 */
54 static int
nul_match(struct auth_cred * acred,struct rpc_cred * cred,int taskflags)55 nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
56 {
57 return 1;
58 }
59
60 /*
61 * Marshal credential.
62 */
63 static __be32 *
nul_marshal(struct rpc_task * task,__be32 * p)64 nul_marshal(struct rpc_task *task, __be32 *p)
65 {
66 *p++ = htonl(RPC_AUTH_NULL);
67 *p++ = 0;
68 *p++ = htonl(RPC_AUTH_NULL);
69 *p++ = 0;
70
71 return p;
72 }
73
74 /*
75 * Refresh credential. This is a no-op for AUTH_NULL
76 */
77 static int
nul_refresh(struct rpc_task * task)78 nul_refresh(struct rpc_task *task)
79 {
80 set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
81 return 0;
82 }
83
84 static __be32 *
nul_validate(struct rpc_task * task,__be32 * p)85 nul_validate(struct rpc_task *task, __be32 *p)
86 {
87 rpc_authflavor_t flavor;
88 u32 size;
89
90 flavor = ntohl(*p++);
91 if (flavor != RPC_AUTH_NULL) {
92 printk("RPC: bad verf flavor: %u\n", flavor);
93 return ERR_PTR(-EIO);
94 }
95
96 size = ntohl(*p++);
97 if (size != 0) {
98 printk("RPC: bad verf size: %u\n", size);
99 return ERR_PTR(-EIO);
100 }
101
102 return p;
103 }
104
105 const struct rpc_authops authnull_ops = {
106 .owner = THIS_MODULE,
107 .au_flavor = RPC_AUTH_NULL,
108 .au_name = "NULL",
109 .create = nul_create,
110 .destroy = nul_destroy,
111 .lookup_cred = nul_lookup_cred,
112 };
113
114 static
115 struct rpc_auth null_auth = {
116 .au_cslack = 4,
117 .au_rslack = 2,
118 .au_ops = &authnull_ops,
119 .au_flavor = RPC_AUTH_NULL,
120 .au_count = ATOMIC_INIT(0),
121 };
122
123 static
124 const struct rpc_credops null_credops = {
125 .cr_name = "AUTH_NULL",
126 .crdestroy = nul_destroy_cred,
127 .crbind = rpcauth_generic_bind_cred,
128 .crmatch = nul_match,
129 .crmarshal = nul_marshal,
130 .crrefresh = nul_refresh,
131 .crvalidate = nul_validate,
132 };
133
134 static
135 struct rpc_cred null_cred = {
136 .cr_lru = LIST_HEAD_INIT(null_cred.cr_lru),
137 .cr_auth = &null_auth,
138 .cr_ops = &null_credops,
139 .cr_count = ATOMIC_INIT(1),
140 .cr_flags = 1UL << RPCAUTH_CRED_UPTODATE,
141 #ifdef RPC_DEBUG
142 .cr_magic = RPCAUTH_CRED_MAGIC,
143 #endif
144 };
145