blob: 41a633a4049e822a9bc097686d5415005c8fa079 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/sunrpc/clnt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Jeff Laytonf895b252014-11-17 16:58:04 -050014#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
Linus Torvalds1da177e2005-04-16 15:20:36 -070015# 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 *
Sargun Dhillon82b98ca2018-07-05 16:48:50 +000022nul_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023{
Trond Myklebust331bc712018-10-14 10:40:29 -040024 refcount_inc(&null_auth.au_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 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 return get_rpccred(&null_cred);
40}
41
42/*
43 * Destroy cred handle.
44 */
45static void
46nul_destroy_cred(struct rpc_cred *cred)
47{
48}
49
50/*
51 * Match cred handle against current process
52 */
53static int
54nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
55{
56 return 1;
57}
58
59/*
60 * Marshal credential.
61 */
Chuck Levere8680a22019-02-11 11:24:48 -050062static int
63nul_marshal(struct rpc_task *task, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
Chuck Levere8680a22019-02-11 11:24:48 -050065 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Chuck Levere8680a22019-02-11 11:24:48 -050067 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
79/*
80 * Refresh credential. This is a no-op for AUTH_NULL
81 */
82static int
83nul_refresh(struct rpc_task *task)
84{
Trond Myklebusta17c2152010-07-31 14:29:08 -040085 set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 return 0;
87}
88
Chuck Levera0584ee2019-02-11 11:24:58 -050089static int
90nul_validate(struct rpc_task *task, struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
Chuck Levera0584ee2019-02-11 11:24:58 -050092 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Chuck Levera0584ee2019-02-11 11:24:58 -050094 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102}
103
Trond Myklebustf1c0a8612007-06-23 20:17:58 -0400104const struct rpc_authops authnull_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 .owner = THIS_MODULE,
106 .au_flavor = RPC_AUTH_NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 .au_name = "NULL",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 .create = nul_create,
109 .destroy = nul_destroy,
110 .lookup_cred = nul_lookup_cred,
111};
112
113static
114struct rpc_auth null_auth = {
Chuck Lever45006322016-03-01 13:06:02 -0500115 .au_cslack = NUL_CALLSLACK,
116 .au_rslack = NUL_REPLYSLACK,
Chuck Levera00275b2019-02-11 11:25:31 -0500117 .au_verfsize = NUL_REPLYSLACK,
Chuck Lever35e77d22019-02-11 11:25:36 -0500118 .au_ralign = NUL_REPLYSLACK,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 .au_ops = &authnull_ops,
Trond Myklebust81039f12006-06-09 09:34:34 -0400120 .au_flavor = RPC_AUTH_NULL,
Trond Myklebust331bc712018-10-14 10:40:29 -0400121 .au_count = REFCOUNT_INIT(1),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122};
123
124static
Trond Myklebustf1c0a8612007-06-23 20:17:58 -0400125const struct rpc_credops null_credops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 .cr_name = "AUTH_NULL",
127 .crdestroy = nul_destroy_cred,
128 .crmatch = nul_match,
129 .crmarshal = nul_marshal,
Chuck Levere8680a22019-02-11 11:24:48 -0500130 .crwrap_req = rpcauth_wrap_req_encode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 .crrefresh = nul_refresh,
132 .crvalidate = nul_validate,
Chuck Levera0584ee2019-02-11 11:24:58 -0500133 .crunwrap_resp = rpcauth_unwrap_resp_decode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134};
135
136static
137struct rpc_cred null_cred = {
Trond Myklebuste092bdc2007-06-23 19:45:36 -0400138 .cr_lru = LIST_HEAD_INIT(null_cred.cr_lru),
Trond Myklebust4a8c1342007-06-07 10:14:14 -0400139 .cr_auth = &null_auth,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 .cr_ops = &null_credops,
Trond Myklebust79b18182018-10-14 10:34:31 -0400141 .cr_count = REFCOUNT_INIT(2),
Trond Myklebustfc432dd2007-06-25 10:15:15 -0400142 .cr_flags = 1UL << RPCAUTH_CRED_UPTODATE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143};