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/utsname.h>
  12 #include <linux/sunrpc/clnt.h>
  13
  14 #ifdef RPC_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_clnt *clnt, rpc_authflavor_t flavor)
  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         return get_rpccred(&null_cred);
  40 }
  41
  42 /*
  43  * Destroy cred handle.
  44  */
  45 static void
  46 nul_destroy_cred(struct rpc_cred *cred)
  47 {
  48 }
  49
  50 /*
  51  * Match cred handle against current process
  52  */
  53 static int
  54 nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
  55 {
  56         return 1;
  57 }
  58
  59 /*
  60  * Marshal credential.
  61  */
  62 static __be32 *
  63 nul_marshal(struct rpc_task *task, __be32 *p)
  64 {
  65         *p++ = htonl(RPC_AUTH_NULL);
  66         *p++ = 0;
  67         *p++ = htonl(RPC_AUTH_NULL);
  68         *p++ = 0;
  69
  70         return p;
  71 }
  72
  73 /*
  74  * Refresh credential. This is a no-op for AUTH_NULL
  75  */
  76 static int
  77 nul_refresh(struct rpc_task *task)
  78 {
  79         set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_msg.rpc_cred->cr_flags);
  80         return 0;
  81 }
  82
  83 static __be32 *
  84 nul_validate(struct rpc_task *task, __be32 *p)
  85 {
  86         rpc_authflavor_t        flavor;
  87         u32                     size;
  88
  89         flavor = ntohl(*p++);
  90         if (flavor != RPC_AUTH_NULL) {
  91                 printk("RPC: bad verf flavor: %u\n", flavor);
  92                 return NULL;
  93         }
  94
  95         size = ntohl(*p++);
  96         if (size != 0) {
  97                 printk("RPC: bad verf size: %u\n", size);
  98                 return NULL;
  99         }
 100
 101         return p;
 102 }
 103
 104 const struct rpc_authops authnull_ops = {
 105         .owner          = THIS_MODULE,
 106         .au_flavor      = RPC_AUTH_NULL,
 107         .au_name        = "NULL",
 108         .create         = nul_create,
 109         .destroy        = nul_destroy,
 110         .lookup_cred    = nul_lookup_cred,
 111 };
 112
 113 static
 114 struct rpc_auth null_auth = {
 115         .au_cslack      = 4,
 116         .au_rslack      = 2,
 117         .au_ops         = &authnull_ops,
 118         .au_flavor      = RPC_AUTH_NULL,
 119         .au_count       = ATOMIC_INIT(0),
 120 };
 121
 122 static
 123 const struct rpc_credops null_credops = {
 124         .cr_name        = "AUTH_NULL",
 125         .crdestroy      = nul_destroy_cred,
 126         .crbind         = rpcauth_generic_bind_cred,
 127         .crmatch        = nul_match,
 128         .crmarshal      = nul_marshal,
 129         .crrefresh      = nul_refresh,
 130         .crvalidate     = nul_validate,
 131 };
 132
 133 static
 134 struct rpc_cred null_cred = {
 135         .cr_lru         = LIST_HEAD_INIT(null_cred.cr_lru),
 136         .cr_auth        = &null_auth,
 137         .cr_ops         = &null_credops,
 138         .cr_count       = ATOMIC_INIT(1),
 139         .cr_flags       = 1UL << RPCAUTH_CRED_UPTODATE,
 140 #ifdef RPC_DEBUG
 141         .cr_magic       = RPCAUTH_CRED_MAGIC,
 142 #endif
 143 };