NFS/SUNRPC: don't lookup machine credential until rpcauth_bindcred().

When NFS creates a machine credential, it is a "generic" credential,
not tied to any auth protocol, and is really just a container for
the princpal name.
This doesn't get linked to a genuine credential until rpcauth_bindcred()
is called.
The lookup always succeeds, so various places that test if the machine
credential is NULL, are pointless.

As a step towards getting rid of generic credentials, this patch gets
rid of generic machine credentials.  The nfs_client and rpc_client
just hold a pointer to a constant principal name.
When a machine credential is wanted, a special static 'struct rpc_cred'
pointer is used. rpcauth_bindcred() recognizes this, finds the
principal from the client, and binds the correct credential.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

3 files changed, 40 insertions, 24 deletions

diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 63e2d35c10d5..9e709dcc8c39 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -39,6 +39,20 @@ static const struct rpc_authops __rcu *auth_flavors[RPC_AUTH_MAXFLAVOR] = {
 static LIST_HEAD(cred_unused);
 static unsigned long number_cred_unused;
 
+static struct rpc_cred machine_cred = {
+	.cr_count = REFCOUNT_INIT(1),
+};
+
+/*
+ * Return the machine_cred pointer to be used whenever
+ * the a generic machine credential is needed.
+ */
+struct rpc_cred *rpc_machine_cred(void)
+{
+	return &machine_cred;
+}
+EXPORT_SYMBOL_GPL(rpc_machine_cred);
+
 #define MAX_HASHTABLE_BITS (14)
 static int param_set_hashtbl_sz(const char *val, const struct kernel_param *kp)
 {
@@ -703,6 +717,22 @@ rpcauth_bind_root_cred(struct rpc_task *task, int lookupflags)
 }
 
 static struct rpc_cred *
+rpcauth_bind_machine_cred(struct rpc_task *task, int lookupflags)
+{
+	struct rpc_auth *auth = task->tk_client->cl_auth;
+	struct auth_cred acred = {
+		.principal = task->tk_client->cl_principal,
+		.cred = init_task.cred,
+	};
+
+	if (!acred.principal)
+		return NULL;
+	dprintk("RPC: %5u looking up %s machine cred\n",
+		task->tk_pid, task->tk_client->cl_auth->au_ops->au_name);
+	return auth->au_ops->lookup_cred(auth, &acred, lookupflags);
+}
+
+static struct rpc_cred *
 rpcauth_bind_new_cred(struct rpc_task *task, int lookupflags)
 {
 	struct rpc_auth *auth = task->tk_client->cl_auth;
@@ -716,14 +746,20 @@ static int
 rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags)
 {
 	struct rpc_rqst *req = task->tk_rqstp;
-	struct rpc_cred *new;
+	struct rpc_cred *new = NULL;
 	int lookupflags = 0;
 
 	if (flags & RPC_TASK_ASYNC)
 		lookupflags |= RPCAUTH_LOOKUP_NEW;
-	if (cred != NULL)
+	if (cred != NULL && cred != &machine_cred)
 		new = cred->cr_ops->crbind(task, cred, lookupflags);
-	else if (flags & RPC_TASK_ROOTCREDS)
+	else if (cred == &machine_cred)
+		new = rpcauth_bind_machine_cred(task, lookupflags);
+
+	/* If machine cred couldn't be bound, try a root cred */
+	if (new)
+		;
+	else if (cred == &machine_cred || (flags & RPC_TASK_ROOTCREDS))
 		new = rpcauth_bind_root_cred(task, lookupflags);
 	else
 		new = rpcauth_bind_new_cred(task, lookupflags);
diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c
index 7d1a8f45726c..5f7aa6324b78 100644
--- a/net/sunrpc/auth_generic.c
+++ b/net/sunrpc/auth_generic.c
@@ -48,27 +48,6 @@ struct rpc_cred *rpc_lookup_cred_nonblock(void)
 }
 EXPORT_SYMBOL_GPL(rpc_lookup_cred_nonblock);
 
-/*
- * Public call interface for looking up machine creds.
- * Note that if service_name is NULL, we actually look up
- * "root" credential.
- */
-struct rpc_cred *rpc_lookup_machine_cred(const char *service_name)
-{
-	struct auth_cred acred = {
-		.principal = service_name,
-		.cred = get_task_cred(&init_task),
-	};
-	struct rpc_cred *ret;
-
-	dprintk("RPC:       looking up machine cred for service %s\n",
-			service_name);
-	ret = generic_auth.au_ops->lookup_cred(&generic_auth, &acred, 0);
-	put_cred(acred.cred);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(rpc_lookup_machine_cred);
-
 static struct rpc_cred *generic_bind_cred(struct rpc_task *task,
 		struct rpc_cred *cred, int lookupflags)
 {
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 24cbddc44c88..c5bf56abf266 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -627,6 +627,7 @@ static struct rpc_clnt *__rpc_clone_client(struct rpc_create_args *args,
 	new->cl_noretranstimeo = clnt->cl_noretranstimeo;
 	new->cl_discrtry = clnt->cl_discrtry;
 	new->cl_chatty = clnt->cl_chatty;
+	new->cl_principal = clnt->cl_principal;
 	return new;
 
 out_err: