[PATCH] Keys: Allow in-kernel key requestor to pass auxiliary data to upcaller
The proposed NFS key type uses its own method of passing key requests to
userspace (upcalling) rather than invoking /sbin/request-key. This is
because the responsible userspace daemon should already be running and will
be contacted through rpc_pipefs.
This patch permits the NFS filesystem to pass auxiliary data to the upcall
operation (struct key_type::request_key) so that the upcaller can use a
pre-existing communications channel more easily.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-By: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 58d1efd..f573ac1 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -1,6 +1,6 @@
/* request_key.c: request a key from userspace
*
- * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004-6 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
@@ -33,7 +33,8 @@
*/
static int call_sbin_request_key(struct key *key,
struct key *authkey,
- const char *op)
+ const char *op,
+ void *aux)
{
struct task_struct *tsk = current;
key_serial_t prkey, sskey;
@@ -127,6 +128,7 @@
static struct key *__request_key_construction(struct key_type *type,
const char *description,
const char *callout_info,
+ void *aux,
unsigned long flags)
{
request_key_actor_t actor;
@@ -164,7 +166,7 @@
actor = call_sbin_request_key;
if (type->request_key)
actor = type->request_key;
- ret = actor(key, authkey, "create");
+ ret = actor(key, authkey, "create", aux);
if (ret < 0)
goto request_failed;
@@ -258,8 +260,9 @@
*/
static struct key *request_key_construction(struct key_type *type,
const char *description,
- struct key_user *user,
const char *callout_info,
+ void *aux,
+ struct key_user *user,
unsigned long flags)
{
struct key_construction *pcons;
@@ -284,7 +287,7 @@
}
/* see about getting userspace to construct the key */
- key = __request_key_construction(type, description, callout_info,
+ key = __request_key_construction(type, description, callout_info, aux,
flags);
error:
kleave(" = %p", key);
@@ -392,6 +395,7 @@
struct key *request_key_and_link(struct key_type *type,
const char *description,
const char *callout_info,
+ void *aux,
struct key *dest_keyring,
unsigned long flags)
{
@@ -399,8 +403,9 @@
struct key *key;
key_ref_t key_ref;
- kenter("%s,%s,%s,%p,%lx",
- type->name, description, callout_info, dest_keyring, flags);
+ kenter("%s,%s,%s,%p,%p,%lx",
+ type->name, description, callout_info, aux,
+ dest_keyring, flags);
/* search all the process keyrings for a key */
key_ref = search_process_keyrings(type, description, type->match,
@@ -433,8 +438,8 @@
/* ask userspace (returns NULL if it waited on a key
* being constructed) */
key = request_key_construction(type, description,
- user, callout_info,
- flags);
+ callout_info, aux,
+ user, flags);
if (key)
break;
@@ -491,8 +496,27 @@
const char *callout_info)
{
return request_key_and_link(type, description, callout_info, NULL,
- KEY_ALLOC_IN_QUOTA);
+ NULL, KEY_ALLOC_IN_QUOTA);
} /* end request_key() */
EXPORT_SYMBOL(request_key);
+
+/*****************************************************************************/
+/*
+ * request a key with auxiliary data for the upcaller
+ * - search the process's keyrings
+ * - check the list of keys being created or updated
+ * - call out to userspace for a key if supplementary info was provided
+ */
+struct key *request_key_with_auxdata(struct key_type *type,
+ const char *description,
+ const char *callout_info,
+ void *aux)
+{
+ return request_key_and_link(type, description, callout_info, aux,
+ NULL, KEY_ALLOC_IN_QUOTA);
+
+} /* end request_key_with_auxdata() */
+
+EXPORT_SYMBOL(request_key_with_auxdata);