auth_null.c

Go to the documentation of this file.

/*
 * linux/net/sunrpc/auth_null.c
 *
 * AUTH_NULL authentication. Really :-)
 *
 * Copyright (C) 1996, Olaf Kirch <[email protected]>
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/sunrpc/clnt.h>

#ifdef RPC_DEBUG
# define RPCDBG_FACILITY    RPCDBG_AUTH
#endif

static struct rpc_auth null_auth;
static struct rpc_cred null_cred;

static struct rpc_auth *
nul_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
{
    atomic_inc(&null_auth.au_count);
    return &null_auth;
}

static void
nul_destroy(struct rpc_auth *auth)
{
}

/*
 * Lookup NULL creds for current process
 */
static struct rpc_cred *
nul_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
{
    return get_rpccred(&null_cred);
}

/*
 * Destroy cred handle.
 */
static void
nul_destroy_cred(struct rpc_cred *cred)
{
}

/*
 * Match cred handle against current process
 */
static int
nul_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
{
    return 1;
}

/*
 * Marshal credential.
 */
static __be32 *
nul_marshal(struct rpc_task *task, __be32 *p)
{
    *p++ = htonl(RPC_AUTH_NULL);
    *p++ = 0;
    *p++ = htonl(RPC_AUTH_NULL);
    *p++ = 0;

    return p;
}

/*
 * Refresh credential. This is a no-op for AUTH_NULL
 */
static int
nul_refresh(struct rpc_task *task)
{
    set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
    return 0;
}

static __be32 *
nul_validate(struct rpc_task *task, __be32 *p)
{
    rpc_authflavor_t    flavor;
    u32         size;

    flavor = ntohl(*p++);
    if (flavor != RPC_AUTH_NULL) {
        printk("RPC: bad verf flavor: %u\n", flavor);
        return NULL;
    }

    size = ntohl(*p++);
    if (size != 0) {
        printk("RPC: bad verf size: %u\n", size);
        return NULL;
    }

    return p;
}

const struct rpc_authops authnull_ops = {
    .owner      = THIS_MODULE,
    .au_flavor  = RPC_AUTH_NULL,
    .au_name    = "NULL",
    .create     = nul_create,
    .destroy    = nul_destroy,
    .lookup_cred    = nul_lookup_cred,
};

static
struct rpc_auth null_auth = {
    .au_cslack  = 4,
    .au_rslack  = 2,
    .au_ops     = &authnull_ops,
    .au_flavor  = RPC_AUTH_NULL,
    .au_count   = ATOMIC_INIT(0),
};

static
const struct rpc_credops null_credops = {
    .cr_name    = "AUTH_NULL",
    .crdestroy  = nul_destroy_cred,
    .crbind     = rpcauth_generic_bind_cred,
    .crmatch    = nul_match,
    .crmarshal  = nul_marshal,
    .crrefresh  = nul_refresh,
    .crvalidate = nul_validate,
};

static
struct rpc_cred null_cred = {
    .cr_lru     = LIST_HEAD_INIT(null_cred.cr_lru),
    .cr_auth    = &null_auth,
    .cr_ops     = &null_credops,
    .cr_count   = ATOMIC_INIT(1),
    .cr_flags   = 1UL << RPCAUTH_CRED_UPTODATE,
#ifdef RPC_DEBUG
    .cr_magic   = RPCAUTH_CRED_MAGIC,
#endif
};