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>
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 63e2d35..9e709dc 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);