2005-04-17 00:20:36 +02:00
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/*
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* linux/net/sunrpc/svcauth.c
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*
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* The generic interface for RPC authentication on the server side.
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*
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* CHANGES
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* 19-Apr-2000 Chris Evans - Security fix
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/module.h>
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/svcsock.h>
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#include <linux/sunrpc/svcauth.h>
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#include <linux/err.h>
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#include <linux/hash.h>
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#define RPCDBG_FACILITY RPCDBG_AUTH
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/*
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* Table of authenticators
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*/
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extern struct auth_ops svcauth_null;
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extern struct auth_ops svcauth_unix;
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static DEFINE_SPINLOCK(authtab_lock);
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static struct auth_ops *authtab[RPC_AUTH_MAXFLAVOR] = {
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[0] = &svcauth_null,
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[1] = &svcauth_unix,
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};
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int
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2006-09-27 07:29:38 +02:00
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svc_authenticate(struct svc_rqst *rqstp, __be32 *authp)
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2005-04-17 00:20:36 +02:00
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{
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rpc_authflavor_t flavor;
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struct auth_ops *aops;
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*authp = rpc_auth_ok;
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2006-09-27 07:28:46 +02:00
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flavor = svc_getnl(&rqstp->rq_arg.head[0]);
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2005-04-17 00:20:36 +02:00
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dprintk("svc: svc_authenticate (%d)\n", flavor);
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spin_lock(&authtab_lock);
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if (flavor >= RPC_AUTH_MAXFLAVOR || !(aops = authtab[flavor])
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|| !try_module_get(aops->owner)) {
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spin_unlock(&authtab_lock);
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*authp = rpc_autherr_badcred;
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return SVC_DENIED;
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}
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spin_unlock(&authtab_lock);
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rqstp->rq_authop = aops;
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return aops->accept(rqstp, authp);
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}
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int svc_set_client(struct svc_rqst *rqstp)
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{
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return rqstp->rq_authop->set_client(rqstp);
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}
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/* A request, which was authenticated, has now executed.
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* Time to finalise the the credentials and verifier
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* and release and resources
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*/
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int svc_authorise(struct svc_rqst *rqstp)
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{
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struct auth_ops *aops = rqstp->rq_authop;
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int rv = 0;
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rqstp->rq_authop = NULL;
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if (aops) {
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rv = aops->release(rqstp);
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module_put(aops->owner);
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}
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return rv;
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}
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int
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svc_auth_register(rpc_authflavor_t flavor, struct auth_ops *aops)
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{
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int rv = -EINVAL;
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spin_lock(&authtab_lock);
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if (flavor < RPC_AUTH_MAXFLAVOR && authtab[flavor] == NULL) {
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authtab[flavor] = aops;
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rv = 0;
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}
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spin_unlock(&authtab_lock);
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return rv;
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}
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void
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svc_auth_unregister(rpc_authflavor_t flavor)
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{
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spin_lock(&authtab_lock);
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if (flavor < RPC_AUTH_MAXFLAVOR)
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authtab[flavor] = NULL;
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spin_unlock(&authtab_lock);
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}
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EXPORT_SYMBOL(svc_auth_unregister);
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/**************************************************
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2006-03-27 11:14:59 +02:00
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* 'auth_domains' are stored in a hash table indexed by name.
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* When the last reference to an 'auth_domain' is dropped,
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* the object is unhashed and freed.
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* If auth_domain_lookup fails to find an entry, it will return
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* it's second argument 'new'. If this is non-null, it will
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* have been atomically linked into the table.
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2005-04-17 00:20:36 +02:00
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*/
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#define DN_HASHBITS 6
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#define DN_HASHMAX (1<<DN_HASHBITS)
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#define DN_HASHMASK (DN_HASHMAX-1)
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2006-03-27 11:14:59 +02:00
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static struct hlist_head auth_domain_table[DN_HASHMAX];
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static spinlock_t auth_domain_lock = SPIN_LOCK_UNLOCKED;
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2005-04-17 00:20:36 +02:00
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void auth_domain_put(struct auth_domain *dom)
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{
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2006-03-27 11:14:59 +02:00
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if (atomic_dec_and_lock(&dom->ref.refcount, &auth_domain_lock)) {
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hlist_del(&dom->hash);
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dom->flavour->domain_release(dom);
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}
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2005-04-17 00:20:36 +02:00
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}
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struct auth_domain *
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2006-03-27 11:14:59 +02:00
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auth_domain_lookup(char *name, struct auth_domain *new)
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2005-04-17 00:20:36 +02:00
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{
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2006-03-27 11:14:59 +02:00
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struct auth_domain *hp;
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struct hlist_head *head;
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struct hlist_node *np;
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head = &auth_domain_table[hash_str(name, DN_HASHBITS)];
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spin_lock(&auth_domain_lock);
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hlist_for_each_entry(hp, np, head, hash) {
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if (strcmp(hp->name, name)==0) {
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kref_get(&hp->ref);
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spin_unlock(&auth_domain_lock);
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return hp;
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2005-04-17 00:20:36 +02:00
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}
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}
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2006-10-30 07:46:45 +01:00
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if (new)
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2006-03-27 11:14:59 +02:00
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hlist_add_head(&new->hash, head);
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spin_unlock(&auth_domain_lock);
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return new;
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2005-04-17 00:20:36 +02:00
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}
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struct auth_domain *auth_domain_find(char *name)
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{
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2006-03-27 11:14:59 +02:00
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return auth_domain_lookup(name, NULL);
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2005-04-17 00:20:36 +02:00
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}
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