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/*
* QEMU migration TLS support
*
* Copyright (c) 2015 Red Hat, Inc.
*
* 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 "channel.h"
#include "migration.h"
#include "tls.h"
#include "options.h"
#include "crypto/tlscreds.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "trace.h"
static QCryptoTLSCreds *
migration_tls_get_creds(QCryptoTLSCredsEndpoint endpoint, Error **errp)
{
Object *creds;
const char *tls_creds = migrate_tls_creds();
QCryptoTLSCreds *ret;
creds = object_resolve_path_component(object_get_objects_root(), tls_creds);
if (!creds) {
error_setg(errp, "No TLS credentials with id '%s'", tls_creds);
return NULL;
}
ret = (QCryptoTLSCreds *)object_dynamic_cast(
creds, TYPE_QCRYPTO_TLS_CREDS);
if (!ret) {
error_setg(errp, "Object with id '%s' is not TLS credentials",
tls_creds);
return NULL;
}
if (!qcrypto_tls_creds_check_endpoint(ret, endpoint, errp)) {
return NULL;
}
return ret;
}
static void migration_tls_incoming_handshake(QIOTask *task,
gpointer opaque)
{
QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task));
Error *err = NULL;
if (qio_task_propagate_error(task, &err)) {
trace_migration_tls_incoming_handshake_error(error_get_pretty(err));
error_report_err(err);
} else {
trace_migration_tls_incoming_handshake_complete();
migration_channel_process_incoming(ioc);
}
object_unref(OBJECT(ioc));
}
void migration_tls_channel_process_incoming(MigrationState *s,
QIOChannel *ioc,
Error **errp)
{
QCryptoTLSCreds *creds;
QIOChannelTLS *tioc;
creds = migration_tls_get_creds(QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, errp);
if (!creds) {
return;
}
tioc = qio_channel_tls_new_server(ioc, creds, migrate_tls_authz(), errp);
if (!tioc) {
return;
}
trace_migration_tls_incoming_handshake_start();
qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-incoming");
qio_channel_tls_handshake(tioc,
migration_tls_incoming_handshake,
NULL,
NULL,
NULL);
}
static void migration_tls_outgoing_handshake(QIOTask *task,
gpointer opaque)
{
MigrationState *s = opaque;
QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task));
Error *err = NULL;
if (qio_task_propagate_error(task, &err)) {
trace_migration_tls_outgoing_handshake_error(error_get_pretty(err));
} else {
trace_migration_tls_outgoing_handshake_complete();
}
migration_channel_connect(s, ioc, NULL, err);
object_unref(OBJECT(ioc));
}
QIOChannelTLS *migration_tls_client_create(QIOChannel *ioc,
const char *hostname,
Error **errp)
{
QCryptoTLSCreds *creds;
creds = migration_tls_get_creds(QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, errp);
if (!creds) {
return NULL;
}
const char *tls_hostname = migrate_tls_hostname();
if (tls_hostname && *tls_hostname) {
hostname = tls_hostname;
}
return qio_channel_tls_new_client(ioc, creds, hostname, errp);
}
void migration_tls_channel_connect(MigrationState *s,
QIOChannel *ioc,
const char *hostname,
Error **errp)
{
QIOChannelTLS *tioc;
tioc = migration_tls_client_create(ioc, hostname, errp);
if (!tioc) {
return;
}
/* Save hostname into MigrationState for handshake */
s->hostname = g_strdup(hostname);
trace_migration_tls_outgoing_handshake_start(hostname);
qio_channel_set_name(QIO_CHANNEL(tioc), "migration-tls-outgoing");
qio_channel_tls_handshake(tioc,
migration_tls_outgoing_handshake,
s,
NULL,
NULL);
}
void migration_tls_channel_end(QIOChannel *ioc, Error **errp)
{
qio_channel_tls_bye(QIO_CHANNEL_TLS(ioc), errp);
}
bool migrate_channel_requires_tls_upgrade(QIOChannel *ioc)
{
if (!migrate_tls()) {
return false;
}
return !object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS);
}
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