qemu/crypto/secret_keyring.c
Eduardo Habkost c734cd40a1 qom: Remove ParentClassType argument from OBJECT_DECLARE_SIMPLE_TYPE
The requirement to specify the parent class type makes the macro
harder to use and easy to misuse (silent bugs can be introduced
if the wrong struct type is specified).

Simplify the macro by just not declaring any class struct,
allowing us to remove the class_size field from the TypeInfo
variables for those types.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200916182519.415636-3-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2020-09-18 14:12:32 -04:00

148 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), "loaded", true, 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_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);