mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 03:10:12 +00:00
![Dmitry Kasatkin](/assets/img/avatar_default.png)
Instead of allowing public keys, with certificates signed by any key on the system trusted keyring, to be added to a trusted keyring, this patch further restricts the certificates to those signed only by builtin keys on the system keyring. This patch defines a new option 'builtin' for the kernel parameter 'keys_ownerid' to allow trust validation using builtin keys. Simplified Mimi's "KEYS: define an owner trusted keyring" patch Changelog v7: - rename builtin_keys to use_builtin_keys Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/* System trusted keyring for trusted public keys
|
|
*
|
|
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/err.h>
|
|
#include <keys/asymmetric-type.h>
|
|
#include <keys/system_keyring.h>
|
|
#include "module-internal.h"
|
|
|
|
struct key *system_trusted_keyring;
|
|
EXPORT_SYMBOL_GPL(system_trusted_keyring);
|
|
|
|
extern __initconst const u8 system_certificate_list[];
|
|
extern __initconst const unsigned long system_certificate_list_size;
|
|
|
|
/*
|
|
* Load the compiled-in keys
|
|
*/
|
|
static __init int system_trusted_keyring_init(void)
|
|
{
|
|
pr_notice("Initialise system trusted keyring\n");
|
|
|
|
system_trusted_keyring =
|
|
keyring_alloc(".system_keyring",
|
|
KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
|
|
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
|
|
KEY_ALLOC_NOT_IN_QUOTA, NULL);
|
|
if (IS_ERR(system_trusted_keyring))
|
|
panic("Can't allocate system trusted keyring\n");
|
|
|
|
set_bit(KEY_FLAG_TRUSTED_ONLY, &system_trusted_keyring->flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Must be initialised before we try and load the keys into the keyring.
|
|
*/
|
|
device_initcall(system_trusted_keyring_init);
|
|
|
|
/*
|
|
* Load the compiled-in list of X.509 certificates.
|
|
*/
|
|
static __init int load_system_certificate_list(void)
|
|
{
|
|
key_ref_t key;
|
|
const u8 *p, *end;
|
|
size_t plen;
|
|
|
|
pr_notice("Loading compiled-in X.509 certificates\n");
|
|
|
|
p = system_certificate_list;
|
|
end = p + system_certificate_list_size;
|
|
while (p < end) {
|
|
/* Each cert begins with an ASN.1 SEQUENCE tag and must be more
|
|
* than 256 bytes in size.
|
|
*/
|
|
if (end - p < 4)
|
|
goto dodgy_cert;
|
|
if (p[0] != 0x30 &&
|
|
p[1] != 0x82)
|
|
goto dodgy_cert;
|
|
plen = (p[2] << 8) | p[3];
|
|
plen += 4;
|
|
if (plen > end - p)
|
|
goto dodgy_cert;
|
|
|
|
key = key_create_or_update(make_key_ref(system_trusted_keyring, 1),
|
|
"asymmetric",
|
|
NULL,
|
|
p,
|
|
plen,
|
|
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
KEY_USR_VIEW | KEY_USR_READ),
|
|
KEY_ALLOC_NOT_IN_QUOTA |
|
|
KEY_ALLOC_TRUSTED);
|
|
if (IS_ERR(key)) {
|
|
pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
|
|
PTR_ERR(key));
|
|
} else {
|
|
set_bit(KEY_FLAG_BUILTIN, &key_ref_to_ptr(key)->flags);
|
|
pr_notice("Loaded X.509 cert '%s'\n",
|
|
key_ref_to_ptr(key)->description);
|
|
key_ref_put(key);
|
|
}
|
|
p += plen;
|
|
}
|
|
|
|
return 0;
|
|
|
|
dodgy_cert:
|
|
pr_err("Problem parsing in-kernel X.509 certificate list\n");
|
|
return 0;
|
|
}
|
|
late_initcall(load_system_certificate_list);
|