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authorDmitry Kasatkin <d.kasatkin@samsung.com>2014-06-17 11:56:59 +0300
committerMimi Zohar <zohar@linux.vnet.ibm.com>2014-07-17 09:35:17 -0400
commit32c4741cb66703a3c282f41d77deff4afd93342a (patch)
tree63797ca87c02956f5dbc4552a0aa9dc058d6cd52 /crypto
parentffb70f61bab1482a3bd0f85fd8f1e9c9909df2ca (diff)
downloadlinux-stericsson-32c4741cb66703a3c282f41d77deff4afd93342a.tar.gz
KEYS: validate certificate trust only with builtin keys
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>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/asymmetric_keys/x509_public_key.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index d376195e1d08..927ce755ff67 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -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;