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/*

 * linux/net/sunrpc/svcauth.c

 *

 * The generic interface for RPC authentication on the server side.

 *

 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>

 *

 * CHANGES

 * 19-Apr-2000 Chris Evans      - Security fix

 */

#include <linux/types.h>

#include <linux/module.h>

#include <linux/sunrpc/types.h>

#include <linux/sunrpc/xdr.h>

#include <linux/sunrpc/svcsock.h>

#include <linux/sunrpc/svcauth.h>

#include <linux/err.h>

#include <linux/hash.h>

#define RPCDBG_FACILITY RPCDBG_AUTH

/*

 * Table of authenticators

 */

extern struct auth_ops svcauth_null;

extern struct auth_ops svcauth_unix;

static DEFINE_SPINLOCK(authtab_lock);

static struct auth_ops  *authtab[RPC_AUTH_MAXFLAVOR] = {

        [0] = &svcauth_null,

        [1] = &svcauth_unix,

};

int

svc_authenticate(struct svc_rqst *rqstp, __be32 *authp)

{

        rpc_authflavor_t        flavor;

        struct auth_ops         *aops;

        *authp = rpc_auth_ok;

        flavor = svc_getnl(&rqstp->rq_arg.head[0]);

        dprintk("svc: svc_authenticate (%d)\n", flavor);

        spin_lock(&authtab_lock);

        if (flavor >= RPC_AUTH_MAXFLAVOR || !(aops = authtab[flavor])

                        || !try_module_get(aops->owner)) {

                spin_unlock(&authtab_lock);

                *authp = rpc_autherr_badcred;

                return SVC_DENIED;

        }

        spin_unlock(&authtab_lock);

        rqstp->rq_authop = aops;

        return aops->accept(rqstp, authp);

}

int svc_set_client(struct svc_rqst *rqstp)

{

        return rqstp->rq_authop->set_client(rqstp);

}

/* A request, which was authenticated, has now executed.

 * Time to finalise the credentials and verifier

 * and release and resources

 */

int svc_authorise(struct svc_rqst *rqstp)

{

        struct auth_ops *aops = rqstp->rq_authop;

        int rv = 0;

        rqstp->rq_authop = NULL;

        if (aops) {

                rv = aops->release(rqstp);

                module_put(aops->owner);

        }

        return rv;

}

int

svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops)

{

        int rv = -EINVAL;

        spin_lock(&authtab_lock);

        if (flavor < RPC_AUTH_MAXFLAVOR && authtab[flavor] == NULL) {

                authtab[flavor] = aops;

                rv = 0;

        }

        spin_unlock(&authtab_lock);

        return rv;

}

void

svc_auth_unregister(rpc_authflavor_t flavor)

{

        spin_lock(&authtab_lock);

        if (flavor < RPC_AUTH_MAXFLAVOR)

                authtab[flavor] = NULL;

        spin_unlock(&authtab_lock);

}

EXPORT_SYMBOL(svc_auth_unregister);

/**************************************************

 * 'auth_domains' are stored in a hash table indexed by name.

 * When the last reference to an 'auth_domain' is dropped,

 * the object is unhashed and freed.

 * If auth_domain_lookup fails to find an entry, it will return

 * it's second argument 'new'.  If this is non-null, it will

 * have been atomically linked into the table.

 */

#define DN_HASHBITS     6

#define DN_HASHMAX      (1<<DN_HASHBITS)

#define DN_HASHMASK     (DN_HASHMAX-1)

static struct hlist_head        auth_domain_table[DN_HASHMAX];

static spinlock_t       auth_domain_lock =

        __SPIN_LOCK_UNLOCKED(auth_domain_lock);

void auth_domain_put(struct auth_domain *dom)

{

        if (atomic_dec_and_lock(&dom->ref.refcount, &auth_domain_lock)) {

                hlist_del(&dom->hash);

                dom->flavour->domain_release(dom);

                spin_unlock(&auth_domain_lock);

        }

}

struct auth_domain *

auth_domain_lookup(char *name, struct auth_domain *new)

{

        struct auth_domain *hp;

        struct hlist_head *head;

        struct hlist_node *np;

        head = &auth_domain_table[hash_str(name, DN_HASHBITS)];

        spin_lock(&auth_domain_lock);

        hlist_for_each_entry(hp, np, head, hash) {

                if (strcmp(hp->name, name)==0) {

                        kref_get(&hp->ref);

                        spin_unlock(&auth_domain_lock);

                        return hp;

                }

        }

        if (new)

                hlist_add_head(&new->hash, head);

        spin_unlock(&auth_domain_lock);

        return new;

}

struct auth_domain *auth_domain_find(char *name)

{

        return auth_domain_lookup(name, NULL);

}