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#ifdef RPC_DEBUG
  14# define RPCDBG_FACILITY        RPCDBG_AUTH
  15#endif
  16
  17static struct rpc_auth null_auth;
  18static struct rpc_cred null_cred;
  19
  20static struct rpc_auth *
  21nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
  22{
  23        atomic_inc(&null_auth.au_count);
  24        return &null_auth;
  25}
  26
  27static void
  28nul_destroy(struct rpc_auth *auth)
  29{
  30}
  31
  32/*
  33 * Lookup NULL creds for current process
  34 */
  35static struct rpc_cred *
  36nul_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 */
  44static void
  45nul_destroy_cred(struct rpc_cred *cred)
  46{
  47}
  48
  49/*
  50 * Match cred handle against current process
  51 */
  52static int
  53nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
  54{
  55        return 1;
  56}
  57
  58/*
  59 * Marshal credential.
  60 */
  61static __be32 *
  62nul_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 */
  75static int
  76nul_refresh(struct rpc_task *task)
  77{
  78        set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
  79        return 0;
  80}
  81
  82static __be32 *
  83nul_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
 103const 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
 112static
 113struct 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
 121static
 122const 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
 132static
 133struct 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};
 143
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