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[Qemu-devel] [PATCH v2 6/8] ui: enforce TLS when using websockets server
From: |
Daniel P. Berrange |
Subject: |
[Qemu-devel] [PATCH v2 6/8] ui: enforce TLS when using websockets server |
Date: |
Tue, 17 Mar 2015 13:42:58 +0000 |
When TLS is required, the primary VNC server considers it to be
mandatory. ie the server admin decides whether or not TLS is used,
and the client has to comply with this decision. The websockets
server, however, treated it as optional, allowing non-TLS clients
to connect to a server which had setup TLS. Thus enabling websockets
lowers the security of the VNC server leaving the admin no way to
enforce use of TLS.
This removes the code that allows non-TLS fallback in the websockets
server, so that if TLS is requested for VNC it is now mandatory for
both the primary VNC server and the websockets VNC server.
Signed-off-by: Daniel P. Berrange <address@hidden>
---
ui/vnc-ws.c | 31 +++++++------------------------
ui/vnc-ws.h | 2 +-
ui/vnc.c | 2 +-
3 files changed, 9 insertions(+), 26 deletions(-)
diff --git a/ui/vnc-ws.c b/ui/vnc-ws.c
index 1769d52..0fcce4e 100644
--- a/ui/vnc-ws.c
+++ b/ui/vnc-ws.c
@@ -24,8 +24,6 @@
#ifdef CONFIG_VNC_TLS
#include "qemu/sockets.h"
-static void vncws_tls_handshake_io(void *opaque);
-
static int vncws_start_tls_handshake(struct VncState *vs)
{
int ret = gnutls_handshake(vs->ws_tls.session);
@@ -53,33 +51,18 @@ static int vncws_start_tls_handshake(struct VncState *vs)
return 0;
}
-static void vncws_tls_handshake_io(void *opaque)
+void vncws_tls_handshake_io(void *opaque)
{
struct VncState *vs = (struct VncState *)opaque;
- VNC_DEBUG("Handshake IO continue\n");
- vncws_start_tls_handshake(vs);
-}
-
-void vncws_tls_handshake_peek(void *opaque)
-{
- VncState *vs = opaque;
- long ret;
-
- if (!vs->ws_tls.session) {
- char peek[4];
- ret = qemu_recv(vs->csock, peek, sizeof(peek), MSG_PEEK);
- if (ret && (strncmp(peek, "\x16", 1) == 0
- || strncmp(peek, "\x80", 1) == 0)) {
- VNC_DEBUG("TLS Websocket connection recognized");
- vnc_tls_client_setup(vs, 1);
- vncws_start_tls_handshake(vs);
- } else {
- vncws_handshake_read(vs);
+ if (!vs->tls.session) {
+ VNC_DEBUG("TLS Websocket setup\n");
+ if (vnc_tls_client_setup(vs, vs->vd->tls.x509cert != NULL) < 0) {
+ return;
}
- } else {
- qemu_set_fd_handler2(vs->csock, NULL, vncws_handshake_read, NULL, vs);
}
+ VNC_DEBUG("Handshake IO continue\n");
+ vncws_start_tls_handshake(vs);
}
#endif /* CONFIG_VNC_TLS */
diff --git a/ui/vnc-ws.h b/ui/vnc-ws.h
index 95c1b0a..ef229b7 100644
--- a/ui/vnc-ws.h
+++ b/ui/vnc-ws.h
@@ -75,7 +75,7 @@ enum {
};
#ifdef CONFIG_VNC_TLS
-void vncws_tls_handshake_peek(void *opaque);
+void vncws_tls_handshake_io(void *opaque);
#endif /* CONFIG_VNC_TLS */
void vncws_handshake_read(void *opaque);
long vnc_client_write_ws(VncState *vs);
diff --git a/ui/vnc.c b/ui/vnc.c
index caa47f0..ed01cef 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -3036,7 +3036,7 @@ static void vnc_connect(VncDisplay *vd, int csock,
vs->websocket = 1;
#ifdef CONFIG_VNC_TLS
if (vd->ws_tls) {
- qemu_set_fd_handler2(vs->csock, NULL, vncws_tls_handshake_peek,
+ qemu_set_fd_handler2(vs->csock, NULL, vncws_tls_handshake_io,
NULL, vs);
} else
#endif /* CONFIG_VNC_TLS */
--
2.1.0
- [Qemu-devel] [PATCH v2 0/8] Misc fixes for VNC, Daniel P. Berrange, 2015/03/17
- [Qemu-devel] [PATCH v2 4/8] ui: split setup of VNC auth scheme into separate method, Daniel P. Berrange, 2015/03/17
- [Qemu-devel] [PATCH v2 1/8] ui: remove unused 'wiremode' variable in VncState struct, Daniel P. Berrange, 2015/03/17
- [Qemu-devel] [PATCH v2 2/8] ui: replace printf() calls with VNC_DEBUG, Daniel P. Berrange, 2015/03/17
- [Qemu-devel] [PATCH v2 6/8] ui: enforce TLS when using websockets server,
Daniel P. Berrange <=
- [Qemu-devel] [PATCH v2 5/8] ui: fix setup of VNC websockets auth scheme with TLS, Daniel P. Berrange, 2015/03/17
- [Qemu-devel] [PATCH v2 3/8] ui: report error if user requests VNC option that is unsupported, Daniel P. Berrange, 2015/03/17
- [Qemu-devel] [PATCH v2 7/8] ui: remove separate gnutls_session for websockets server, Daniel P. Berrange, 2015/03/17
- [Qemu-devel] [PATCH v2 8/8] ui: ensure VNC websockets server checks the ACL if requested, Daniel P. Berrange, 2015/03/17