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ui: convert VNC server to use QIOChannelTLS

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Switch VNC server over to using the QIOChannelTLS object for
the TLS session. This removes all remaining VNC specific code
for dealing with TLS handshakes.

Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2015-03-02 19:01:05 +00:00
parent 04d2529da2
commit 2cc452281e
4 changed files with 74 additions and 203 deletions
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106
ui/vnc-auth-vencrypt.c
View File

@ -63,71 +63,21 @@ static void start_auth_vencrypt_subauth(VncState *vs)
}
}
static gboolean vnc_tls_handshake_io(QIOChannel *ioc,
GIOCondition condition,
void *opaque);
static int vnc_start_vencrypt_handshake(VncState *vs)
static void vnc_tls_handshake_done(Object *source,
Error *err,
gpointer user_data)
{
Error *err = NULL;
VncState *vs = user_data;
if (qcrypto_tls_session_handshake(vs->tls, &err) < 0) {
goto error;
}
switch (qcrypto_tls_session_get_handshake_status(vs->tls)) {
case QCRYPTO_TLS_HANDSHAKE_COMPLETE:
VNC_DEBUG("Handshake done, checking credentials\n");
if (qcrypto_tls_session_check_credentials(vs->tls, &err) < 0) {
goto error;
}
VNC_DEBUG("Client verification passed, starting TLS I/O\n");
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
if (err) {
VNC_DEBUG("Handshake failed %s\n",
error_get_pretty(err));
vnc_client_error(vs);
} else {
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN | G_IO_OUT, vnc_client_io, vs, NULL);
start_auth_vencrypt_subauth(vs);
break;
case QCRYPTO_TLS_HANDSHAKE_RECVING:
VNC_DEBUG("Handshake interrupted (blocking read)\n");
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN, vnc_tls_handshake_io, vs, NULL);
break;
case QCRYPTO_TLS_HANDSHAKE_SENDING:
VNC_DEBUG("Handshake interrupted (blocking write)\n");
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_OUT, vnc_tls_handshake_io, vs, NULL);
break;
}
return 0;
error:
VNC_DEBUG("Handshake failed %s\n", error_get_pretty(err));
error_free(err);
vnc_client_error(vs);
return -1;
}
static gboolean vnc_tls_handshake_io(QIOChannel *ioc G_GNUC_UNUSED,
GIOCondition condition G_GNUC_UNUSED,
void *opaque)
{
VncState *vs = (VncState *)opaque;
VNC_DEBUG("Handshake IO continue\n");
vnc_start_vencrypt_handshake(vs);
return TRUE;
}
@ -142,33 +92,37 @@ static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len
vnc_client_error(vs);
} else {
Error *err = NULL;
QIOChannelTLS *tls;
VNC_DEBUG("Accepting auth %d, setting up TLS for handshake\n", auth);
vnc_write_u8(vs, 1); /* Accept auth */
vnc_flush(vs);
vs->tls = qcrypto_tls_session_new(vs->vd->tlscreds,
NULL,
vs->vd->tlsaclname,
QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
&err);
if (!vs->tls) {
VNC_DEBUG("Failed to setup TLS %s\n",
error_get_pretty(err));
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
vs->ioc_tag = 0;
}
tls = qio_channel_tls_new_server(
vs->ioc,
vs->vd->tlscreds,
vs->vd->tlsaclname,
&err);
if (!tls) {
VNC_DEBUG("Failed to setup TLS %s\n", error_get_pretty(err));
error_free(err);
vnc_client_error(vs);
return 0;
}
qcrypto_tls_session_set_callbacks(vs->tls,
vnc_tls_push,
vnc_tls_pull,
vs);
VNC_DEBUG("Start TLS VeNCrypt handshake process\n");
if (vnc_start_vencrypt_handshake(vs) < 0) {
VNC_DEBUG("Failed to start TLS handshake\n");
return 0;
}
object_unref(OBJECT(vs->ioc));
vs->ioc = QIO_CHANNEL(tls);
vs->tls = qio_channel_tls_get_session(tls);
qio_channel_tls_handshake(tls,
vnc_tls_handshake_done,
vs,
NULL);
}
return 0;
}

97
ui/vnc-ws.c
View File

@ -22,83 +22,60 @@
#include "qemu/main-loop.h"
#include "crypto/hash.h"
static int vncws_start_tls_handshake(VncState *vs)
static void vncws_handshake_read(VncState *vs);
static void vncws_tls_handshake_done(Object *source,
Error *err,
gpointer user_data)
{
Error *err = NULL;
VncState *vs = user_data;
if (qcrypto_tls_session_handshake(vs->tls, &err) < 0) {
goto error;
if (err) {
VNC_DEBUG("Handshake failed %s\n", error_get_pretty(err));
vnc_client_error(vs);
} else {
vs->ioc_tag = qio_channel_add_watch(
QIO_CHANNEL(vs->ioc), G_IO_IN, vncws_handshake_io, vs, NULL);
}
switch (qcrypto_tls_session_get_handshake_status(vs->tls)) {
case QCRYPTO_TLS_HANDSHAKE_COMPLETE:
VNC_DEBUG("Handshake done, checking credentials\n");
if (qcrypto_tls_session_check_credentials(vs->tls, &err) < 0) {
goto error;
}
VNC_DEBUG("Client verification passed, starting TLS I/O\n");
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN, vncws_handshake_io, vs, NULL);
break;
case QCRYPTO_TLS_HANDSHAKE_RECVING:
VNC_DEBUG("Handshake interrupted (blocking read)\n");
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN, vncws_tls_handshake_io, vs, NULL);
break;
case QCRYPTO_TLS_HANDSHAKE_SENDING:
VNC_DEBUG("Handshake interrupted (blocking write)\n");
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_OUT, vncws_tls_handshake_io, vs, NULL);
break;
}
return 0;
error:
VNC_DEBUG("Handshake failed %s\n", error_get_pretty(err));
error_free(err);
vnc_client_error(vs);
return -1;
}
gboolean vncws_tls_handshake_io(QIOChannel *ioc G_GNUC_UNUSED,
GIOCondition condition G_GNUC_UNUSED,
void *opaque)
{
VncState *vs = (VncState *)opaque;
VncState *vs = opaque;
QIOChannelTLS *tls;
Error *err = NULL;
vs->tls = qcrypto_tls_session_new(vs->vd->tlscreds,
NULL,
vs->vd->tlsaclname,
QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
&err);
if (!vs->tls) {
VNC_DEBUG("Failed to setup TLS %s\n",
error_get_pretty(err));
VNC_DEBUG("TLS Websocket connection required\n");
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
vs->ioc_tag = 0;
}
tls = qio_channel_tls_new_server(
vs->ioc,
vs->vd->tlscreds,
vs->vd->tlsaclname,
&err);
if (!tls) {
VNC_DEBUG("Failed to setup TLS %s\n", error_get_pretty(err));
error_free(err);
vnc_client_error(vs);
return TRUE;
}
qcrypto_tls_session_set_callbacks(vs->tls,
vnc_tls_push,
vnc_tls_pull,
vs);
VNC_DEBUG("Start TLS WS handshake process\n");
vncws_start_tls_handshake(vs);
object_unref(OBJECT(vs->ioc));
vs->ioc = QIO_CHANNEL(tls);
vs->tls = qio_channel_tls_get_session(tls);
qio_channel_tls_handshake(tls,
vncws_tls_handshake_done,
vs,
NULL);
return TRUE;
}

69
ui/vnc.c
View File

@ -1201,7 +1201,6 @@ void vnc_disconnect_finish(VncState *vs)
vnc_tight_clear(vs);
vnc_zrle_clear(vs);
qcrypto_tls_session_free(vs->tls);
#ifdef CONFIG_VNC_SASL
vnc_sasl_client_cleanup(vs);
#endif /* CONFIG_VNC_SASL */
@ -1267,38 +1266,6 @@ void vnc_client_error(VncState *vs)
}
ssize_t vnc_tls_pull(char *buf, size_t len, void *opaque)
{
VncState *vs = opaque;
ssize_t ret = qio_channel_read(vs->ioc, buf, len, NULL);
if (ret < 0) {
if (ret == QIO_CHANNEL_ERR_BLOCK) {
errno = EAGAIN;
} else {
errno = EIO;
}
return -1;
}
return ret;
}
ssize_t vnc_tls_push(const char *buf, size_t len, void *opaque)
{
VncState *vs = opaque;
ssize_t ret = qio_channel_write(vs->ioc, buf, len, NULL);
if (ret < 0) {
if (ret == QIO_CHANNEL_ERR_BLOCK) {
errno = EAGAIN;
} else {
errno = EIO;
}
return -1;
}
return ret;
}
/*
* Called to write a chunk of data to the client socket. The data may
* be the raw data, or may have already been encoded by SASL.
@ -1318,21 +1285,8 @@ ssize_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen)
{
Error *err = NULL;
ssize_t ret;
if (vs->tls) {
ret = qcrypto_tls_session_write(vs->tls, (const char *)data, datalen);
if (ret < 0) {
if (errno == EAGAIN) {
ret = QIO_CHANNEL_ERR_BLOCK;
} else {
ret = -1;
error_setg_errno(&err, errno, "%s",
"Cannot write to TLS socket");
}
}
} else {
ret = qio_channel_write(
vs->ioc, (const char *)data, datalen, &err);
}
ret = qio_channel_write(
vs->ioc, (const char *)data, datalen, &err);
VNC_DEBUG("Wrote wire %p %zd -> %ld\n", data, datalen, ret);
return vnc_client_io_error(vs, ret, &err);
}
@ -1448,21 +1402,8 @@ ssize_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen)
{
ssize_t ret;
Error *err = NULL;
if (vs->tls) {
ret = qcrypto_tls_session_read(vs->tls, (char *)data, datalen);
if (ret < 0) {
if (errno == EAGAIN) {
ret = QIO_CHANNEL_ERR_BLOCK;
} else {
ret = -1;
error_setg_errno(&err, errno, "%s",
"Cannot read from TLS socket");
}
}
} else {
ret = qio_channel_read(
vs->ioc, (char *)data, datalen, &err);
}
ret = qio_channel_read(
vs->ioc, (char *)data, datalen, &err);
VNC_DEBUG("Read wire %p %zd -> %ld\n", data, datalen, ret);
return vnc_client_io_error(vs, ret, &err);
}
@ -3773,7 +3714,7 @@ void vnc_display_open(const char *id, Error **errp)
vs->tlsaclname = g_strdup_printf("vnc.%s.x509dname", vs->id);
}
qemu_acl_init(vs->tlsaclname);
}
}
#ifdef CONFIG_VNC_SASL
if (acl && sasl) {
char *aclname;

5
ui/vnc.h
View File

@ -36,6 +36,7 @@
#include "crypto/tlssession.h"
#include "qemu/buffer.h"
#include "io/channel-socket.h"
#include "io/channel-tls.h"
#include <zlib.h>
#include <stdbool.h>
@ -281,7 +282,7 @@ struct VncState
int auth;
int subauth; /* Used by VeNCrypt */
char challenge[VNC_AUTH_CHALLENGE_SIZE];
QCryptoTLSSession *tls;
QCryptoTLSSession *tls; /* Borrowed pointer from channel, don't free */
#ifdef CONFIG_VNC_SASL
VncStateSASL sasl;
#endif
@ -511,8 +512,6 @@ gboolean vnc_client_io(QIOChannel *ioc,
ssize_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen);
ssize_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen);
ssize_t vnc_tls_pull(char *buf, size_t len, void *opaque);
ssize_t vnc_tls_push(const char *buf, size_t len, void *opaque);
/* Protocol I/O functions */
void vnc_write(VncState *vs, const void *data, size_t len);