mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 03:59:52 +00:00
54e7aac056
Add the ability for the secret object to obtain secret data from the Linux in-kernel key managment and retention facility, as an extra option to the existing ones: reading from a file or passing directly as a string. The secret is identified by the key serial number. The upper layers need to instantiate the key and make sure the QEMU process has access permissions to read it. Signed-off-by: Alexey Krasikov <alex-krasikov@yandex-team.ru> - Fixed up detection logic default behaviour in configure Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
149 lines
3.9 KiB
C
149 lines
3.9 KiB
C
/*
|
|
* QEMU crypto secret support
|
|
*
|
|
* Copyright 2020 Yandex N.V.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include <asm/unistd.h>
|
|
#include <linux/keyctl.h>
|
|
#include "qapi/error.h"
|
|
#include "qom/object_interfaces.h"
|
|
#include "trace.h"
|
|
#include "crypto/secret_keyring.h"
|
|
|
|
|
|
static inline
|
|
long keyctl_read(int32_t key, uint8_t *buffer, size_t buflen)
|
|
{
|
|
return syscall(__NR_keyctl, KEYCTL_READ, key, buffer, buflen, 0);
|
|
}
|
|
|
|
|
|
static void
|
|
qcrypto_secret_keyring_load_data(QCryptoSecretCommon *sec_common,
|
|
uint8_t **output,
|
|
size_t *outputlen,
|
|
Error **errp)
|
|
{
|
|
QCryptoSecretKeyring *secret = QCRYPTO_SECRET_KEYRING(sec_common);
|
|
uint8_t *buffer = NULL;
|
|
long retcode;
|
|
|
|
*output = NULL;
|
|
*outputlen = 0;
|
|
|
|
if (!secret->serial) {
|
|
error_setg(errp, "'serial' parameter must be provided");
|
|
return;
|
|
}
|
|
|
|
retcode = keyctl_read(secret->serial, NULL, 0);
|
|
if (retcode <= 0) {
|
|
goto keyctl_error;
|
|
}
|
|
|
|
buffer = g_new0(uint8_t, retcode);
|
|
|
|
retcode = keyctl_read(secret->serial, buffer, retcode);
|
|
if (retcode < 0) {
|
|
g_free(buffer);
|
|
goto keyctl_error;
|
|
}
|
|
|
|
*outputlen = retcode;
|
|
*output = buffer;
|
|
return;
|
|
|
|
keyctl_error:
|
|
error_setg_errno(errp, errno,
|
|
"Unable to read serial key %08x",
|
|
secret->serial);
|
|
}
|
|
|
|
|
|
static void
|
|
qcrypto_secret_prop_set_key(Object *obj, Visitor *v,
|
|
const char *name, void *opaque,
|
|
Error **errp)
|
|
{
|
|
QCryptoSecretKeyring *secret = QCRYPTO_SECRET_KEYRING(obj);
|
|
int32_t value;
|
|
visit_type_int32(v, name, &value, errp);
|
|
if (!value) {
|
|
error_setg(errp, "'serial' should not be equal to 0");
|
|
}
|
|
secret->serial = value;
|
|
}
|
|
|
|
|
|
static void
|
|
qcrypto_secret_prop_get_key(Object *obj, Visitor *v,
|
|
const char *name, void *opaque,
|
|
Error **errp)
|
|
{
|
|
QCryptoSecretKeyring *secret = QCRYPTO_SECRET_KEYRING(obj);
|
|
int32_t value = secret->serial;
|
|
visit_type_int32(v, name, &value, errp);
|
|
}
|
|
|
|
|
|
static void
|
|
qcrypto_secret_keyring_complete(UserCreatable *uc, Error **errp)
|
|
{
|
|
object_property_set_bool(OBJECT(uc), true, "loaded", errp);
|
|
}
|
|
|
|
|
|
static void
|
|
qcrypto_secret_keyring_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
QCryptoSecretCommonClass *sic = QCRYPTO_SECRET_COMMON_CLASS(oc);
|
|
sic->load_data = qcrypto_secret_keyring_load_data;
|
|
|
|
UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
|
|
ucc->complete = qcrypto_secret_keyring_complete;
|
|
|
|
object_class_property_add(oc, "serial", "int32_t",
|
|
qcrypto_secret_prop_get_key,
|
|
qcrypto_secret_prop_set_key,
|
|
NULL, NULL);
|
|
}
|
|
|
|
|
|
static const TypeInfo qcrypto_secret_info = {
|
|
.parent = TYPE_QCRYPTO_SECRET_COMMON,
|
|
.name = TYPE_QCRYPTO_SECRET_KEYRING,
|
|
.instance_size = sizeof(QCryptoSecretKeyring),
|
|
.class_size = sizeof(QCryptoSecretKeyringClass),
|
|
.class_init = qcrypto_secret_keyring_class_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ TYPE_USER_CREATABLE },
|
|
{ }
|
|
}
|
|
};
|
|
|
|
|
|
static void
|
|
qcrypto_secret_register_types(void)
|
|
{
|
|
type_register_static(&qcrypto_secret_info);
|
|
}
|
|
|
|
|
|
type_init(qcrypto_secret_register_types);
|