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authorChuck Lever <chuck.lever@oracle.com>2013-03-16 23:54:43 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-03-29 23:43:07 +0400
commit9568c5e9a61de49f67f524404a27a1014a8d7f1e (patch)
tree5bc8c5496bae61b6e5dfac11e620f7aef18a58b6 /net/sunrpc/auth.c
parentfb15b26f8ba3ff629a052faf3f4a4744585ca2dc (diff)
downloadlinux-9568c5e9a61de49f67f524404a27a1014a8d7f1e.tar.xz
SUNRPC: Introduce rpcauth_get_pseudoflavor()
A SECINFO reply may contain flavors whose kernel module is not yet loaded by the client's kernel. A new RPC client API, called rpcauth_get_pseudoflavor(), is introduced to do proper checking for support of a security flavor. When this API is invoked, the RPC client now tries to load the module for each flavor first before performing the "is this supported?" check. This means if a module is available on the client, but has not been loaded yet, it will be loaded and registered automatically when the SECINFO reply is processed. The new API can take a full GSS tuple (OID, QoP, and service). Previously only the OID and service were considered. nfs_find_best_sec() is updated to verify all flavors requested in a SECINFO reply, including AUTH_NULL and AUTH_UNIX. Previously these two flavors were simply assumed to be supported without consulting the RPC client. Note that the replaced version of nfs_find_best_sec() can return RPC_AUTH_MAXFLAVOR if the server returns a recognized OID but an unsupported "service" value. nfs_find_best_sec() now returns RPC_AUTH_UNIX in this case. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/auth.c')
-rw-r--r--net/sunrpc/auth.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index f5294047df77..9b81be8d9946 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -124,6 +124,41 @@ rpcauth_unregister(const struct rpc_authops *ops)
EXPORT_SYMBOL_GPL(rpcauth_unregister);
/**
+ * rpcauth_get_pseudoflavor - check if security flavor is supported
+ * @flavor: a security flavor
+ * @info: a GSS mech OID, quality of protection, and service value
+ *
+ * Verifies that an appropriate kernel module is available or already loaded.
+ * Returns an equivalent pseudoflavor, or RPC_AUTH_MAXFLAVOR if "flavor" is
+ * not supported locally.
+ */
+rpc_authflavor_t
+rpcauth_get_pseudoflavor(rpc_authflavor_t flavor, struct rpcsec_gss_info *info)
+{
+ const struct rpc_authops *ops;
+ rpc_authflavor_t pseudoflavor;
+
+ ops = auth_flavors[flavor];
+ if (ops == NULL)
+ request_module("rpc-auth-%u", flavor);
+ spin_lock(&rpc_authflavor_lock);
+ ops = auth_flavors[flavor];
+ if (ops == NULL || !try_module_get(ops->owner)) {
+ spin_unlock(&rpc_authflavor_lock);
+ return RPC_AUTH_MAXFLAVOR;
+ }
+ spin_unlock(&rpc_authflavor_lock);
+
+ pseudoflavor = flavor;
+ if (ops->info2flavor != NULL)
+ pseudoflavor = ops->info2flavor(info);
+
+ module_put(ops->owner);
+ return pseudoflavor;
+}
+EXPORT_SYMBOL_GPL(rpcauth_get_pseudoflavor);
+
+/**
* rpcauth_list_flavors - discover registered flavors and pseudoflavors
* @array: array to fill in
* @size: size of "array"