LXR linux/net/sunrpc/auth

   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
  17static struct rpc_auth null_auth;
  18static struct rpc_cred null_cred;
  19
  20static struct rpc_auth *
  21nul_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
  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        if (flags & RPCAUTH_LOOKUP_RCU)
  39                return &null_cred;
  40        return get_rpccred(&null_cred);
  41}
  42
  43/*
  44 * Destroy cred handle.
  45 */
  46static void
  47nul_destroy_cred(struct rpc_cred *cred)
  48{
  49}
  50
  51/*
  52 * Match cred handle against current process
  53 */
  54static int
  55nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
  56{
  57        return 1;
  58}
  59
  60/*
  61 * Marshal credential.
  62 */
  63static __be32 *
  64nul_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 */
  77static int
  78nul_refresh(struct rpc_task *task)
  79{
  80        set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
  81        return 0;
  82}
  83
  84static __be32 *
  85nul_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
 105const 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
 114static
 115struct 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
 123static
 124const 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
 134static
 135struct 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