X.509: Move the trust validation code out to its own file
Move the X.509 trust validation code out to its own file so that it can be generalised. Signed-off-by: David Howells <dhowells@redhat.com>hifive-unleashed-5.1
David Howells
parent
5f7f5c81e5
commit
cfb664ff2b
|
|
@ -4,7 +4,10 @@
|
|||
|
||||
obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += asymmetric_keys.o
|
||||
|
||||
asymmetric_keys-y := asymmetric_type.o signature.o
|
||||
asymmetric_keys-y := \
|
||||
asymmetric_type.o \
|
||||
restrict.o \
|
||||
signature.o
|
||||
|
||||
obj-$(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) += public_key.o
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,106 @@
|
|||
/* Instantiate a public key crypto key from an X.509 Certificate
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) "X.509: "fmt
|
||||
#include <linux/module.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/mpi.h>
|
||||
#include <linux/asn1_decoder.h>
|
||||
#include <keys/asymmetric-subtype.h>
|
||||
#include <keys/asymmetric-parser.h>
|
||||
#include <keys/system_keyring.h>
|
||||
#include <crypto/hash.h>
|
||||
#include <crypto/public_key.h>
|
||||
#include "asymmetric_keys.h"
|
||||
#include "x509_parser.h"
|
||||
|
||||
static bool use_builtin_keys;
|
||||
static struct asymmetric_key_id *ca_keyid;
|
||||
|
||||
#ifndef MODULE
|
||||
static struct {
|
||||
struct asymmetric_key_id id;
|
||||
unsigned char data[10];
|
||||
} cakey;
|
||||
|
||||
static int __init ca_keys_setup(char *str)
|
||||
{
|
||||
if (!str) /* default system keyring */
|
||||
return 1;
|
||||
|
||||
if (strncmp(str, "id:", 3) == 0) {
|
||||
struct asymmetric_key_id *p = &cakey.id;
|
||||
size_t hexlen = (strlen(str) - 3) / 2;
|
||||
int ret;
|
||||
|
||||
if (hexlen == 0 || hexlen > sizeof(cakey.data)) {
|
||||
pr_err("Missing or invalid ca_keys id\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
ret = __asymmetric_key_hex_to_key_id(str + 3, p, hexlen);
|
||||
if (ret < 0)
|
||||
pr_err("Unparsable ca_keys id hex string\n");
|
||||
else
|
||||
ca_keyid = p; /* owner key 'id:xxxxxx' */
|
||||
} else if (strcmp(str, "builtin") == 0) {
|
||||
use_builtin_keys = true;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
__setup("ca_keys=", ca_keys_setup);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Check the new certificate against the ones in the trust keyring. If one of
|
||||
* those is the signing key and validates the new certificate, then mark the
|
||||
* new certificate as being trusted.
|
||||
*
|
||||
* Return 0 if the new certificate was successfully validated, 1 if we couldn't
|
||||
* find a matching parent certificate in the trusted list and an error if there
|
||||
* is a matching certificate but the signature check fails.
|
||||
*/
|
||||
int x509_validate_trust(struct x509_certificate *cert,
|
||||
struct key *trust_keyring)
|
||||
{
|
||||
struct public_key_signature *sig = cert->sig;
|
||||
struct key *key;
|
||||
int ret = 1;
|
||||
|
||||
if (!sig->auth_ids[0] && !sig->auth_ids[1])
|
||||
return 1;
|
||||
|
||||
if (!trust_keyring)
|
||||
return -EOPNOTSUPP;
|
||||
if (ca_keyid && !asymmetric_key_id_partial(sig->auth_ids[1], ca_keyid))
|
||||
return -EPERM;
|
||||
if (cert->unsupported_sig)
|
||||
return -ENOPKG;
|
||||
|
||||
key = find_asymmetric_key(trust_keyring,
|
||||
sig->auth_ids[0], sig->auth_ids[1],
|
||||
false);
|
||||
if (IS_ERR(key))
|
||||
return PTR_ERR(key);
|
||||
|
||||
if (!use_builtin_keys ||
|
||||
test_bit(KEY_FLAG_BUILTIN, &key->flags)) {
|
||||
ret = verify_signature(key, cert->sig);
|
||||
if (ret == -ENOPKG)
|
||||
cert->unsupported_sig = true;
|
||||
}
|
||||
key_put(key);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(x509_validate_trust);
|
||||
|
|
@ -58,3 +58,9 @@ extern int x509_decode_time(time64_t *_t, size_t hdrlen,
|
|||
*/
|
||||
extern int x509_get_sig_params(struct x509_certificate *cert);
|
||||
extern int x509_check_for_self_signed(struct x509_certificate *cert);
|
||||
|
||||
/*
|
||||
* public_key_trust.c
|
||||
*/
|
||||
extern int x509_validate_trust(struct x509_certificate *cert,
|
||||
struct key *trust_keyring);
|
||||
|
|
|
|||
|
|
@ -20,44 +20,6 @@
|
|||
#include "asymmetric_keys.h"
|
||||
#include "x509_parser.h"
|
||||
|
||||
static bool use_builtin_keys;
|
||||
static struct asymmetric_key_id *ca_keyid;
|
||||
|
||||
#ifndef MODULE
|
||||
static struct {
|
||||
struct asymmetric_key_id id;
|
||||
unsigned char data[10];
|
||||
} cakey;
|
||||
|
||||
static int __init ca_keys_setup(char *str)
|
||||
{
|
||||
if (!str) /* default system keyring */
|
||||
return 1;
|
||||
|
||||
if (strncmp(str, "id:", 3) == 0) {
|
||||
struct asymmetric_key_id *p = &cakey.id;
|
||||
size_t hexlen = (strlen(str) - 3) / 2;
|
||||
int ret;
|
||||
|
||||
if (hexlen == 0 || hexlen > sizeof(cakey.data)) {
|
||||
pr_err("Missing or invalid ca_keys id\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
ret = __asymmetric_key_hex_to_key_id(str + 3, p, hexlen);
|
||||
if (ret < 0)
|
||||
pr_err("Unparsable ca_keys id hex string\n");
|
||||
else
|
||||
ca_keyid = p; /* owner key 'id:xxxxxx' */
|
||||
} else if (strcmp(str, "builtin") == 0) {
|
||||
use_builtin_keys = true;
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
__setup("ca_keys=", ca_keys_setup);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Set up the signature parameters in an X.509 certificate. This involves
|
||||
* digesting the signed data and extracting the signature.
|
||||
|
|
@ -187,47 +149,6 @@ not_self_signed:
|
|||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check the new certificate against the ones in the trust keyring. If one of
|
||||
* those is the signing key and validates the new certificate, then mark the
|
||||
* new certificate as being trusted.
|
||||
*
|
||||
* Return 0 if the new certificate was successfully validated, 1 if we couldn't
|
||||
* find a matching parent certificate in the trusted list and an error if there
|
||||
* is a matching certificate but the signature check fails.
|
||||
*/
|
||||
static int x509_validate_trust(struct x509_certificate *cert,
|
||||
struct key *trust_keyring)
|
||||
{
|
||||
struct public_key_signature *sig = cert->sig;
|
||||
struct key *key;
|
||||
int ret = 1;
|
||||
|
||||
if (!sig->auth_ids[0] && !sig->auth_ids[1])
|
||||
return 1;
|
||||
|
||||
if (!trust_keyring)
|
||||
return -EOPNOTSUPP;
|
||||
if (ca_keyid && !asymmetric_key_id_partial(sig->auth_ids[1], ca_keyid))
|
||||
return -EPERM;
|
||||
if (cert->unsupported_sig)
|
||||
return -ENOPKG;
|
||||
|
||||
key = find_asymmetric_key(trust_keyring,
|
||||
sig->auth_ids[0], sig->auth_ids[1], false);
|
||||
if (IS_ERR(key))
|
||||
return PTR_ERR(key);
|
||||
|
||||
if (!use_builtin_keys ||
|
||||
test_bit(KEY_FLAG_BUILTIN, &key->flags)) {
|
||||
ret = verify_signature(key, cert->sig);
|
||||
if (ret == -ENOPKG)
|
||||
cert->unsupported_sig = true;
|
||||
}
|
||||
key_put(key);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Attempt to parse a data blob for a key as an X509 certificate.
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue