net/sunrpc/auth_null.c

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