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SUNRPC: Load GSS kernel module by OID
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>
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@ -3,6 +3,7 @@ config SUNRPC
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config SUNRPC_GSS
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tristate
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select OID_REGISTRY
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config SUNRPC_BACKCHANNEL
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bool
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@ -750,6 +750,7 @@ MODULE_ALIAS("rpc-auth-gss-krb5p");
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MODULE_ALIAS("rpc-auth-gss-390003");
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MODULE_ALIAS("rpc-auth-gss-390004");
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MODULE_ALIAS("rpc-auth-gss-390005");
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MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2");
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static struct gss_api_mech gss_kerberos_mech = {
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.gm_name = "krb5",
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@ -36,6 +36,7 @@
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/oid_registry.h>
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#include <linux/sunrpc/msg_prot.h>
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#include <linux/sunrpc/gss_asn1.h>
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#include <linux/sunrpc/auth_gss.h>
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@ -174,6 +175,12 @@ EXPORT_SYMBOL_GPL(gss_mech_get_by_name);
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static struct gss_api_mech *gss_mech_get_by_OID(struct rpcsec_gss_oid *obj)
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{
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struct gss_api_mech *pos, *gm = NULL;
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char buf[32];
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if (sprint_oid(obj->data, obj->len, buf, sizeof(buf)) < 0)
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return NULL;
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dprintk("RPC: %s(%s)\n", __func__, buf);
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request_module("rpc-auth-gss-%s", buf);
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spin_lock(®istered_mechs_lock);
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list_for_each_entry(pos, ®istered_mechs, gm_list) {
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