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Linux/net/sunrpc/auth_null.c

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  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 #if IS_ENABLED(CONFIG_SUNRPC_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 *
 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
 28 nul_destroy(struct rpc_auth *auth)
 29 {
 30 }
 31 
 32 /*
 33  * Lookup NULL creds for current process
 34  */
 35 static struct rpc_cred *
 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
 47 nul_destroy_cred(struct rpc_cred *cred)
 48 {
 49 }
 50 
 51 /*
 52  * Match cred handle against current process
 53  */
 54 static int
 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 *
 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
 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 *
 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 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
142         .cr_magic       = RPCAUTH_CRED_MAGIC,
143 #endif
144 };
145 

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