[Xen-changelog] [xen-unstable] libxl: SECURITY: always honour request for vnc password

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
# Date 1296845126 0
# Node ID ed9ef3b07d2a9317d4bdef1a8f1fefb1bd63870c
# Parent  25d7e5e2ceea730d5a301996892943639885d6ae
libxl: SECURITY: always honour request for vnc password

qemu only sets a password on its vnc display if the value for the -vnc
option has the ",password" modifier.  The code for constructing
qemu-dm options was broken and only added this modifier for one of the
cases.

Unfortunately there does not appear to be any code for passing the vnc
password to upstream qemu (ie, in the case where
libxl_build_device_model_args_new is called).  To avoid accidentally
running the domain without a password, check for this situation and
fail an assertion.  This will have to be revisited after 4.1.

Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Committed-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libxl/libxl_dm.c |   27 +++++++++++++++++----------
 1 files changed, 17 insertions(+), 10 deletions(-)

diff -r 25d7e5e2ceea -r ed9ef3b07d2a tools/libxl/libxl_dm.c
--- a/tools/libxl/libxl_dm.c    Fri Feb 04 18:43:53 2011 +0000
+++ b/tools/libxl/libxl_dm.c    Fri Feb 04 18:45:26 2011 +0000
@@ -23,6 +23,7 @@
 #include <signal.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <assert.h>
 #include "libxl_utils.h"
 #include "libxl_internal.h"
 #include "libxl.h"
@@ -55,26 +56,29 @@ static char ** libxl_build_device_model_
         flexarray_vappend(dm_args, "-domain-name", info->dom_name, NULL);
 
     if (info->vnc || info->vncdisplay || info->vnclisten || info->vncunused) {
-        flexarray_append(dm_args, "-vnc");
+        char *vncarg;
         if (info->vncdisplay) {
             if (info->vnclisten && strchr(info->vnclisten, ':') == NULL) {
-                flexarray_append(dm_args, 
-                    libxl__sprintf(gc, "%s:%d%s",
+                vncarg = libxl__sprintf(gc, "%s:%d",
                                   info->vnclisten,
-                                  info->vncdisplay,
-                                  info->vncpasswd ? ",password" : ""));
+                                  info->vncdisplay);
             } else {
-                flexarray_append(dm_args, libxl__sprintf(gc, "127.0.0.1:%d", 
info->vncdisplay));
+                vncarg = libxl__sprintf(gc, "127.0.0.1:%d", info->vncdisplay);
             }
         } else if (info->vnclisten) {
             if (strchr(info->vnclisten, ':') != NULL) {
-                flexarray_append(dm_args, info->vnclisten);
+                vncarg = info->vnclisten;
             } else {
-                flexarray_append(dm_args, libxl__sprintf(gc, "%s:0", 
info->vnclisten));
+                vncarg = libxl__sprintf(gc, "%s:0", info->vnclisten);
             }
         } else {
-            flexarray_append(dm_args, "127.0.0.1:0");
-        }
+            vncarg = "127.0.0.1:0";
+        }
+        if (info->vncpasswd)
+            vncarg = libxl__sprintf(gc, "%s,password", vncarg);
+        flexarray_append(dm_args, "-vnc");
+        flexarray_append(dm_args, vncarg);
+        
         if (info->vncunused) {
             flexarray_append(dm_args, "-vncunused");
         }
@@ -193,6 +197,9 @@ static char ** libxl_build_device_model_
         int display = 0;
         const char *listen = "127.0.0.1";
 
+        if (info->vncpasswd && info->vncpasswd[0]) {
+            assert(!"missing code for supplying vnc password to qemu");
+        }
         flexarray_append(dm_args, "-vnc");
 
         if (info->vncdisplay) {

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