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/socket.h>
  11 #include <linux/module.h>
  12 #include <linux/in.h>
  13 #include <linux/utsname.h>
  14 #include <linux/sunrpc/clnt.h>
  15 #include <linux/sched.h>
  16
  17 #ifdef RPC_DEBUG
  18 # define RPCDBG_FACILITY        RPCDBG_AUTH
  19 #endif
  20
  21 static struct rpc_auth null_auth;
  22 static struct rpc_cred null_cred;
  23
  24 static struct rpc_auth *
  25 nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
  26 {
  27         atomic_inc(&null_auth.au_count);
  28         return &null_auth;
  29 }
  30
  31 static void
  32 nul_destroy(struct rpc_auth *auth)
  33 {
  34 }
  35
  36 /*
  37  * Lookup NULL creds for current process
  38  */
  39 static struct rpc_cred *
  40 nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
  41 {
  42         return get_rpccred(&null_cred);
  43 }
  44
  45 /*
  46  * Destroy cred handle.
  47  */
  48 static void
  49 nul_destroy_cred(struct rpc_cred *cred)
  50 {
  51 }
  52
  53 /*
  54  * Match cred handle against current process
  55  */
  56 static int
  57 nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
  58 {
  59         return 1;
  60 }
  61
  62 /*
  63  * Marshal credential.
  64  */
  65 static u32 *
  66 nul_marshal(struct rpc_task *task, u32 *p)
  67 {
  68         *p++ = htonl(RPC_AUTH_NULL);
  69         *p++ = 0;
  70         *p++ = htonl(RPC_AUTH_NULL);
  71         *p++ = 0;
  72
  73         return p;
  74 }
  75
  76 /*
  77  * Refresh credential. This is a no-op for AUTH_NULL
  78  */
  79 static int
  80 nul_refresh(struct rpc_task *task)
  81 {
  82         task->tk_msg.rpc_cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
  83         return 0;
  84 }
  85
  86 static u32 *
  87 nul_validate(struct rpc_task *task, u32 *p)
  88 {
  89         rpc_authflavor_t        flavor;
  90         u32                     size;
  91
  92         flavor = ntohl(*p++);
  93         if (flavor != RPC_AUTH_NULL) {
  94                 printk("RPC: bad verf flavor: %u\n", flavor);
  95                 return NULL;
  96         }
  97
  98         size = ntohl(*p++);
  99         if (size != 0) {
 100                 printk("RPC: bad verf size: %u\n", size);
 101                 return NULL;
 102         }
 103
 104         return p;
 105 }
 106
 107 struct rpc_authops authnull_ops = {
 108         .owner          = THIS_MODULE,
 109         .au_flavor      = RPC_AUTH_NULL,
 110 #ifdef RPC_DEBUG
 111         .au_name        = "NULL",
 112 #endif
 113         .create         = nul_create,
 114         .destroy        = nul_destroy,
 115         .lookup_cred    = nul_lookup_cred,
 116 };
 117
 118 static
 119 struct rpc_auth null_auth = {
 120         .au_cslack      = 4,
 121         .au_rslack      = 2,
 122         .au_ops         = &authnull_ops,
 123 };
 124
 125 static
 126 struct rpc_credops      null_credops = {
 127         .cr_name        = "AUTH_NULL",
 128         .crdestroy      = nul_destroy_cred,
 129         .crmatch        = nul_match,
 130         .crmarshal      = nul_marshal,
 131         .crrefresh      = nul_refresh,
 132         .crvalidate     = nul_validate,
 133 };
 134
 135 static
 136 struct rpc_cred null_cred = {
 137         .cr_ops         = &null_credops,
 138         .cr_count       = ATOMIC_INIT(1),
 139         .cr_flags       = RPCAUTH_CRED_UPTODATE,
 140 #ifdef RPC_DEBUG
 141         .cr_magic       = RPCAUTH_CRED_MAGIC,
 142 #endif
 143 };