1 files changed, 216 insertions, 0 deletions
diff --git a/net/sunrpc/svcauth.c b/net/sunrpc/svcauth.c
new file mode 100644
index 00000000000..bde8147ef2d
--- /dev/null
+++ b/net/sunrpc/svcauth.c
@@ -0,0 +1,216 @@
+/*
+ * 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/sched.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, u32 *authp)
+{
+	rpc_authflavor_t	flavor;
+	struct auth_ops		*aops;
+
+	*authp = rpc_auth_ok;
+
+	flavor = ntohl(svc_getu32(&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 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);
+
+/**************************************************
+ * cache for domain name to auth_domain
+ * Entries are only added by flavours which will normally
+ * have a structure that 'inherits' from auth_domain.
+ * e.g. when an IP -> domainname is given to  auth_unix,
+ * and the domain name doesn't exist, it will create a
+ * auth_unix_domain and add it to this hash table.
+ * If it finds the name does exist, but isn't AUTH_UNIX,
+ * it will complain.
+ */
+
+/*
+ * Auth auth_domain cache is somewhat different to other caches,
+ * largely because the entries are possibly of different types:
+ * each auth flavour has it's own type.
+ * One consequence of this that DefineCacheLookup cannot
+ * allocate a new structure as it cannot know the size.
+ * Notice that the "INIT" code fragment is quite different
+ * from other caches.  When auth_domain_lookup might be
+ * creating a new domain, the new domain is passed in
+ * complete and it is used as-is rather than being copied into
+ * another structure.
+ */
+#define	DN_HASHBITS	6
+#define	DN_HASHMAX	(1<<DN_HASHBITS)
+#define	DN_HASHMASK	(DN_HASHMAX-1)
+
+static struct cache_head	*auth_domain_table[DN_HASHMAX];
+
+static void auth_domain_drop(struct cache_head *item, struct cache_detail *cd)
+{
+	struct auth_domain *dom = container_of(item, struct auth_domain, h);
+	if (cache_put(item,cd))
+		authtab[dom->flavour]->domain_release(dom);
+}
+
+
+struct cache_detail auth_domain_cache = {
+	.hash_size	= DN_HASHMAX,
+	.hash_table	= auth_domain_table,
+	.name		= "auth.domain",
+	.cache_put	= auth_domain_drop,
+};
+
+void auth_domain_put(struct auth_domain *dom)
+{
+	auth_domain_drop(&dom->h, &auth_domain_cache);
+}
+
+static inline int auth_domain_hash(struct auth_domain *item)
+{
+	return hash_str(item->name, DN_HASHBITS);
+}
+static inline int auth_domain_match(struct auth_domain *tmp, struct auth_domain *item)
+{
+	return strcmp(tmp->name, item->name) == 0;
+}
+
+struct auth_domain *
+auth_domain_lookup(struct auth_domain *item, int set)
+{
+	struct auth_domain *tmp = NULL;
+	struct cache_head **hp, **head;
+	head = &auth_domain_cache.hash_table[auth_domain_hash(item)];
+
+	if (set)
+		write_lock(&auth_domain_cache.hash_lock);
+	else
+		read_lock(&auth_domain_cache.hash_lock);
+	for (hp=head; *hp != NULL; hp = &tmp->h.next) {
+		tmp = container_of(*hp, struct auth_domain, h);
+		if (!auth_domain_match(tmp, item))
+			continue;
+		if (!set) {
+			cache_get(&tmp->h);
+			goto out_noset;
+		}
+		*hp = tmp->h.next;
+		tmp->h.next = NULL;
+		auth_domain_drop(&tmp->h, &auth_domain_cache);
+		goto out_set;
+	}
+	/* Didn't find anything */
+	if (!set)
+		goto out_nada;
+	auth_domain_cache.entries++;
+out_set:
+	item->h.next = *head;
+	*head = &item->h;
+	cache_get(&item->h);
+	write_unlock(&auth_domain_cache.hash_lock);
+	cache_fresh(&auth_domain_cache, &item->h, item->h.expiry_time);
+	cache_get(&item->h);
+	return item;
+out_nada:
+	tmp = NULL;
+out_noset:
+	read_unlock(&auth_domain_cache.hash_lock);
+	return tmp;
+}
+
+struct auth_domain *auth_domain_find(char *name)
+{
+	struct auth_domain *rv, ad;
+
+	ad.name = name;
+	rv = auth_domain_lookup(&ad, 0);
+	return rv;
+}