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/*
* 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_class_init(ObjectClass *oc, void *data)
{
QCryptoSecretCommonClass *sic = QCRYPTO_SECRET_COMMON_CLASS(oc);
sic->load_data = qcrypto_secret_keyring_load_data;
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,
};
static void
qcrypto_secret_register_types(void)
{
type_register_static(&qcrypto_secret_info);
}
type_init(qcrypto_secret_register_types);
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