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SUNRPC: Load GSS kernel module by OID

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The current GSS mech switch can find and load GSS pseudoflavor
modules by name ("krb5") or pseudoflavor number ("390003"), but
cannot find GSS modules by GSS tuple:

  [ "1.2.840.113554.1.2.2", GSS_C_QOP_DEFAULT, RPC_GSS_SVC_NONE ]

This is important when dealing with a SECINFO request.  A SECINFO
reply contains a list of flavors the server supports for the
requested export, but GSS flavors also have a GSS tuple that maps
to a pseudoflavor (like 390003 for krb5).

If the GSS module that supports the OID in the tuple is not loaded,
our client is not able to load that module dynamically to support
that pseudoflavor.

Add a way for the GSS mech switch to load GSS pseudoflavor support
by OID before searching for the pseudoflavor that matches the OID
and service.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2013-03-16 15:54:52 -04:00 committed by Trond Myklebust
parent 9568c5e9a6
commit f783288f0c
3 changed files with 9 additions and 0 deletions
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1
net/sunrpc/Kconfig
View File

@ -3,6 +3,7 @@ config SUNRPC
config SUNRPC_GSS
tristate
select OID_REGISTRY
config SUNRPC_BACKCHANNEL
bool

1
net/sunrpc/auth_gss/gss_krb5_mech.c
View File

@ -750,6 +750,7 @@ MODULE_ALIAS("rpc-auth-gss-krb5p");
MODULE_ALIAS("rpc-auth-gss-390003");
MODULE_ALIAS("rpc-auth-gss-390004");
MODULE_ALIAS("rpc-auth-gss-390005");
MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2");
static struct gss_api_mech gss_kerberos_mech = {
.gm_name = "krb5",

7
net/sunrpc/auth_gss/gss_mech_switch.c
View File

@ -36,6 +36,7 @@
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/oid_registry.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/gss_asn1.h>
#include <linux/sunrpc/auth_gss.h>
@ -174,6 +175,12 @@ EXPORT_SYMBOL_GPL(gss_mech_get_by_name);
static struct gss_api_mech *gss_mech_get_by_OID(struct rpcsec_gss_oid *obj)
{
struct gss_api_mech *pos, *gm = NULL;
char buf[32];
if (sprint_oid(obj->data, obj->len, buf, sizeof(buf)) < 0)
return NULL;
dprintk("RPC: %s(%s)\n", __func__, buf);
request_module("rpc-auth-gss-%s", buf);
spin_lock(&registered_mechs_lock);
list_for_each_entry(pos, &registered_mechs, gm_list) {