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KEYS: validate certificate trust only with builtin keys

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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>
This commit is contained in:
Dmitry Kasatkin 2014-06-17 11:56:59 +03:00 committed by Mimi Zohar
parent ffb70f61ba
commit 32c4741cb6
4 changed files with 9 additions and 4 deletions
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2
Documentation/kernel-parameters.txt
View file

@ -569,7 +569,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
ca_keys= [KEYS] This parameter identifies a specific key(s) on
the system trusted keyring to be used for certificate
trust validation.
format: id:<keyid>
format: { id:<keyid> | builtin }
ccw_timeout_log [S390]
See Documentation/s390/CommonIO for details.

9
crypto/asymmetric_keys/x509_public_key.c
View file

@ -24,6 +24,7 @@
#include "public_key.h"
#include "x509_parser.h"
static bool use_builtin_keys;
static char *ca_keyid;
#ifndef MODULE
@ -34,6 +35,8 @@ static int __init ca_keys_setup(char *str)
if (strncmp(str, "id:", 3) == 0)
ca_keyid = str; /* owner key 'id:xxxxxx' */
else if (strcmp(str, "builtin") == 0)
use_builtin_keys = true;
return 1;
}
@ -180,7 +183,6 @@ EXPORT_SYMBOL_GPL(x509_check_signature);
static int x509_validate_trust(struct x509_certificate *cert,
struct key *trust_keyring)
{
const struct public_key *pk;
struct key *key;
int ret = 1;
@ -195,8 +197,9 @@ static int x509_validate_trust(struct x509_certificate *cert,
cert->authority,
strlen(cert->authority));
if (!IS_ERR(key)) {
pk = key->payload.data;
ret = x509_check_signature(pk, cert);
if (!use_builtin_keys
|| test_bit(KEY_FLAG_BUILTIN, &key->flags))
ret = x509_check_signature(key->payload.data, cert);
key_put(key);
}
return ret;

1
include/linux/key.h
View file

@ -170,6 +170,7 @@ struct key {
#define KEY_FLAG_INVALIDATED 7 /* set if key has been invalidated */
#define KEY_FLAG_TRUSTED 8 /* set if key is trusted */
#define KEY_FLAG_TRUSTED_ONLY 9 /* set if keyring only accepts links to trusted keys */
#define KEY_FLAG_BUILTIN 10 /* set if key is builtin */
/* the key type and key description string
* - the desc is used to match a key against search criteria

1
kernel/system_keyring.c
View file

@ -89,6 +89,7 @@ static __init int load_system_certificate_list(void)
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);