qemu/io/channel-tls.c

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/*
* QEMU I/O channels TLS driver
*
* 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 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"
2016-03-14 11:01:28 +03:00
#include "qapi/error.h"
#include "qemu/module.h"
#include "io/channel-tls.h"
#include "trace.h"
static ssize_t qio_channel_tls_write_handler(const char *buf,
size_t len,
void *opaque)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque);
ssize_t ret;
ret = qio_channel_write(tioc->master, buf, len, NULL);
if (ret == QIO_CHANNEL_ERR_BLOCK) {
errno = EAGAIN;
return -1;
} else if (ret < 0) {
errno = EIO;
return -1;
}
return ret;
}
static ssize_t qio_channel_tls_read_handler(char *buf,
size_t len,
void *opaque)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(opaque);
ssize_t ret;
ret = qio_channel_read(tioc->master, buf, len, NULL);
if (ret == QIO_CHANNEL_ERR_BLOCK) {
errno = EAGAIN;
return -1;
} else if (ret < 0) {
errno = EIO;
return -1;
}
return ret;
}
QIOChannelTLS *
qio_channel_tls_new_server(QIOChannel *master,
QCryptoTLSCreds *creds,
const char *aclname,
Error **errp)
{
QIOChannelTLS *ioc;
ioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
ioc->master = master;
object_ref(OBJECT(master));
ioc->session = qcrypto_tls_session_new(
creds,
NULL,
aclname,
QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
errp);
if (!ioc->session) {
goto error;
}
qcrypto_tls_session_set_callbacks(
ioc->session,
qio_channel_tls_write_handler,
qio_channel_tls_read_handler,
ioc);
trace_qio_channel_tls_new_server(ioc, master, creds, aclname);
return ioc;
error:
object_unref(OBJECT(ioc));
return NULL;
}
QIOChannelTLS *
qio_channel_tls_new_client(QIOChannel *master,
QCryptoTLSCreds *creds,
const char *hostname,
Error **errp)
{
QIOChannelTLS *tioc;
QIOChannel *ioc;
tioc = QIO_CHANNEL_TLS(object_new(TYPE_QIO_CHANNEL_TLS));
ioc = QIO_CHANNEL(tioc);
tioc->master = master;
if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
}
object_ref(OBJECT(master));
tioc->session = qcrypto_tls_session_new(
creds,
hostname,
NULL,
QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT,
errp);
if (!tioc->session) {
goto error;
}
qcrypto_tls_session_set_callbacks(
tioc->session,
qio_channel_tls_write_handler,
qio_channel_tls_read_handler,
tioc);
trace_qio_channel_tls_new_client(tioc, master, creds, hostname);
return tioc;
error:
object_unref(OBJECT(tioc));
return NULL;
}
struct QIOChannelTLSData {
QIOTask *task;
GMainContext *context;
};
typedef struct QIOChannelTLSData QIOChannelTLSData;
static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
GIOCondition condition,
gpointer user_data);
static void qio_channel_tls_handshake_task(QIOChannelTLS *ioc,
QIOTask *task,
GMainContext *context)
{
Error *err = NULL;
QCryptoTLSSessionHandshakeStatus status;
if (qcrypto_tls_session_handshake(ioc->session, &err) < 0) {
trace_qio_channel_tls_handshake_fail(ioc);
qio_task_set_error(task, err);
qio_task_complete(task);
return;
}
status = qcrypto_tls_session_get_handshake_status(ioc->session);
if (status == QCRYPTO_TLS_HANDSHAKE_COMPLETE) {
trace_qio_channel_tls_handshake_complete(ioc);
if (qcrypto_tls_session_check_credentials(ioc->session,
&err) < 0) {
trace_qio_channel_tls_credentials_deny(ioc);
qio_task_set_error(task, err);
} else {
trace_qio_channel_tls_credentials_allow(ioc);
}
qio_task_complete(task);
} else {
GIOCondition condition;
QIOChannelTLSData *data = g_new0(typeof(*data), 1);
data->task = task;
data->context = context;
if (context) {
g_main_context_ref(context);
}
if (status == QCRYPTO_TLS_HANDSHAKE_SENDING) {
condition = G_IO_OUT;
} else {
condition = G_IO_IN;
}
trace_qio_channel_tls_handshake_pending(ioc, status);
qio_channel_add_watch_full(ioc->master,
condition,
qio_channel_tls_handshake_io,
data,
NULL,
context);
}
}
static gboolean qio_channel_tls_handshake_io(QIOChannel *ioc,
GIOCondition condition,
gpointer user_data)
{
QIOChannelTLSData *data = user_data;
QIOTask *task = data->task;
GMainContext *context = data->context;
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(
qio_task_get_source(task));
g_free(data);
qio_channel_tls_handshake_task(tioc, task, context);
if (context) {
g_main_context_unref(context);
}
return FALSE;
}
void qio_channel_tls_handshake(QIOChannelTLS *ioc,
QIOTaskFunc func,
gpointer opaque,
GDestroyNotify destroy,
GMainContext *context)
{
QIOTask *task;
task = qio_task_new(OBJECT(ioc),
func, opaque, destroy);
trace_qio_channel_tls_handshake_start(ioc);
qio_channel_tls_handshake_task(ioc, task, context);
}
static void qio_channel_tls_init(Object *obj G_GNUC_UNUSED)
{
}
static void qio_channel_tls_finalize(Object *obj)
{
QIOChannelTLS *ioc = QIO_CHANNEL_TLS(obj);
object_unref(OBJECT(ioc->master));
qcrypto_tls_session_free(ioc->session);
}
static ssize_t qio_channel_tls_readv(QIOChannel *ioc,
const struct iovec *iov,
size_t niov,
int **fds,
size_t *nfds,
Error **errp)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
size_t i;
ssize_t got = 0;
for (i = 0 ; i < niov ; i++) {
ssize_t ret = qcrypto_tls_session_read(tioc->session,
iov[i].iov_base,
iov[i].iov_len);
if (ret < 0) {
if (errno == EAGAIN) {
if (got) {
return got;
} else {
return QIO_CHANNEL_ERR_BLOCK;
}
} else if (errno == ECONNABORTED &&
(tioc->shutdown & QIO_CHANNEL_SHUTDOWN_READ)) {
return 0;
}
error_setg_errno(errp, errno,
"Cannot read from TLS channel");
return -1;
}
got += ret;
if (ret < iov[i].iov_len) {
break;
}
}
return got;
}
static ssize_t qio_channel_tls_writev(QIOChannel *ioc,
const struct iovec *iov,
size_t niov,
int *fds,
size_t nfds,
Error **errp)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
size_t i;
ssize_t done = 0;
for (i = 0 ; i < niov ; i++) {
ssize_t ret = qcrypto_tls_session_write(tioc->session,
iov[i].iov_base,
iov[i].iov_len);
if (ret <= 0) {
if (errno == EAGAIN) {
if (done) {
return done;
} else {
return QIO_CHANNEL_ERR_BLOCK;
}
}
error_setg_errno(errp, errno,
"Cannot write to TLS channel");
return -1;
}
done += ret;
if (ret < iov[i].iov_len) {
break;
}
}
return done;
}
static int qio_channel_tls_set_blocking(QIOChannel *ioc,
bool enabled,
Error **errp)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
return qio_channel_set_blocking(tioc->master, enabled, errp);
}
static void qio_channel_tls_set_delay(QIOChannel *ioc,
bool enabled)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
qio_channel_set_delay(tioc->master, enabled);
}
static void qio_channel_tls_set_cork(QIOChannel *ioc,
bool enabled)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
qio_channel_set_cork(tioc->master, enabled);
}
static int qio_channel_tls_shutdown(QIOChannel *ioc,
QIOChannelShutdown how,
Error **errp)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
tioc->shutdown |= how;
return qio_channel_shutdown(tioc->master, how, errp);
}
static int qio_channel_tls_close(QIOChannel *ioc,
Error **errp)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
return qio_channel_close(tioc->master, errp);
}
static void qio_channel_tls_set_aio_fd_handler(QIOChannel *ioc,
AioContext *ctx,
IOHandler *io_read,
IOHandler *io_write,
void *opaque)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
qio_channel_set_aio_fd_handler(tioc->master, ctx, io_read, io_write, opaque);
}
static GSource *qio_channel_tls_create_watch(QIOChannel *ioc,
GIOCondition condition)
{
QIOChannelTLS *tioc = QIO_CHANNEL_TLS(ioc);
return qio_channel_create_watch(tioc->master, condition);
}
QCryptoTLSSession *
qio_channel_tls_get_session(QIOChannelTLS *ioc)
{
return ioc->session;
}
static void qio_channel_tls_class_init(ObjectClass *klass,
void *class_data G_GNUC_UNUSED)
{
QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
ioc_klass->io_writev = qio_channel_tls_writev;
ioc_klass->io_readv = qio_channel_tls_readv;
ioc_klass->io_set_blocking = qio_channel_tls_set_blocking;
ioc_klass->io_set_delay = qio_channel_tls_set_delay;
ioc_klass->io_set_cork = qio_channel_tls_set_cork;
ioc_klass->io_close = qio_channel_tls_close;
ioc_klass->io_shutdown = qio_channel_tls_shutdown;
ioc_klass->io_create_watch = qio_channel_tls_create_watch;
ioc_klass->io_set_aio_fd_handler = qio_channel_tls_set_aio_fd_handler;
}
static const TypeInfo qio_channel_tls_info = {
.parent = TYPE_QIO_CHANNEL,
.name = TYPE_QIO_CHANNEL_TLS,
.instance_size = sizeof(QIOChannelTLS),
.instance_init = qio_channel_tls_init,
.instance_finalize = qio_channel_tls_finalize,
.class_init = qio_channel_tls_class_init,
};
static void qio_channel_tls_register_types(void)
{
type_register_static(&qio_channel_tls_info);
}
type_init(qio_channel_tls_register_types);