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Linux/net/sunrpc/auth_null.c

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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 
 18 static struct rpc_auth null_auth;
 19 static struct rpc_cred null_cred;
 20 
 21 static struct rpc_auth *
 22 nul_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 
 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         if (flags & RPCAUTH_LOOKUP_RCU)
 40                 return &null_cred;
 41         return get_rpccred(&null_cred);
 42 }
 43 
 44 /*
 45  * Destroy cred handle.
 46  */
 47 static void
 48 nul_destroy_cred(struct rpc_cred *cred)
 49 {
 50 }
 51 
 52 /*
 53  * Match cred handle against current process
 54  */
 55 static int
 56 nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
 57 {
 58         return 1;
 59 }
 60 
 61 /*
 62  * Marshal credential.
 63  */
 64 static __be32 *
 65 nul_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  */
 78 static int
 79 nul_refresh(struct rpc_task *task)
 80 {
 81         set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
 82         return 0;
 83 }
 84 
 85 static __be32 *
 86 nul_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 
106 const 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 
115 static
116 struct 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 
125 static
126 const 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 
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       = ATOMIC_INIT(1),
142         .cr_flags       = 1UL << RPCAUTH_CRED_UPTODATE,
143 };
144 

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