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From bfa1432ea1972b4272e3a7b8927f7c22094e5e44 Mon Sep 17 00:00:00 2001
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From: Ondrej Holy <oholy@redhat.com>
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Date: Tue, 22 May 2018 21:06:06 +0200
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Subject: [PATCH 2/2] Do not listen all if invalid interface is provided
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It is not a good idea from security point of view to listen all interfaces
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in case of invalid interface is provided. We should rather listen to nothing
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and print error in journal.
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https://bugzilla.gnome.org/show_bug.cgi?id=796349
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---
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server/libvncserver/sockets.c | 18 ++++++++++++------
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server/vino-server.c | 3 +++
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2 files changed, 15 insertions(+), 6 deletions(-)
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diff --git a/server/libvncserver/sockets.c b/server/libvncserver/sockets.c
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index 746a3e5..45df6d5 100644
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--- a/server/libvncserver/sockets.c
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+++ b/server/libvncserver/sockets.c
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@@ -152,9 +152,13 @@ rfbInitListenSock(rfbScreenInfoPtr rfbScreen)
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char *netIface = (char*)rfbScreen->netIface;
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int i;
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- if(netIface == NULL || if_nametoindex(netIface) == 0) {
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- if(netIface != NULL)
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- rfbLog("WARNING: This (%s) a invalid network interface, set to all\n", netIface);
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+ if(netIface != NULL && strlen(netIface) > 0) {
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+ if(if_nametoindex(netIface) == 0) {
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+ rfbLog("(%s) is an invalid network interface\n", netIface);
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+ return;
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+ }
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+ }
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+ else {
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netIface = NULL;
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}
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@@ -748,9 +752,11 @@ rfbSetNetworkInterface(rfbScreenInfoPtr rfbScreen, const char *netIface)
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rfbScreen->netIface = netIface;
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}
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else {
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- rfbScreen->netIface = NULL;
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- if(netIface != NULL)
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- rfbLog("WARNING: This (%s) a invalid network interface, set to all\n", netIface);
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+ rfbScreen->netIface = NULL;
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+ if(netIface != NULL && strlen(netIface) > 0) {
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+ rfbLog("(%s) is an invalid network interface\n", netIface);
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+ return FALSE;
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+ }
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}
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rfbLog("Re-binding socket to listen for VNC connections on TCP port %d in (%s) interface\n",
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diff --git a/server/vino-server.c b/server/vino-server.c
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index 38b17e3..b8cd755 100644
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--- a/server/vino-server.c
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+++ b/server/vino-server.c
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@@ -970,6 +970,9 @@ vino_server_init_io_channels(VinoServer *server)
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{
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dprintf (RFB, "%d ", rfb_screen->rfbListenSock[i]);
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+ if (rfb_screen->rfbListenSock[i] == -1)
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+ continue;
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+
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server->priv->io_channel[i] = g_io_channel_unix_new (rfb_screen->rfbListenSock[i]);
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server->priv->io_watch[i] = g_io_add_watch (server->priv->io_channel[i],
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G_IO_IN|G_IO_PRI,
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--
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2.17.0
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