GUACAMOLE-381: Disable or ignore outbound clipboard transfers for VNC…

…/RDP if "disable-copy" is set.

src/protocols/rdp/rdp.c

@@ -240,11 +240,13 @@ BOOL rdp_freerdp_pre_connect(freerdp* instance) {
         guac_rdp_audio_load_plugin(instance->context, dvc_list);
     }
 
-    /* Load clipboard plugin */
-    if (freerdp_channels_load_plugin(channels, instance->settings,
-                "cliprdr", NULL))
+    /* Load clipboard plugin if not disabled */
+    if (!(settings->disable_copy && settings->disable_paste)
+            && freerdp_channels_load_plugin(channels, instance->settings,
+                "cliprdr", NULL)) {
         guac_client_log(client, GUAC_LOG_WARNING,
                 "Failed to load cliprdr plugin. Clipboard will not work.");
+    }
 
     /* If RDPSND/RDPDR required, load them */
     if (settings->printing_enabled

src/protocols/rdp/rdp_cliprdr.c

@@ -230,6 +230,10 @@ void guac_rdp_process_cb_data_response(guac_client* client,
     guac_rdp_client* rdp_client = (guac_rdp_client*) client->data;
     char received_data[GUAC_RDP_CLIPBOARD_MAX_LENGTH];
 
+    /* Ignore received text if outbound clipboard transfer is disabled */
+    if (rdp_client->settings->disable_copy)
+        return;
+
     guac_iconv_read* reader;
     const char* input = (char*) event->data;
     char* output = received_data;

src/protocols/vnc/clipboard.c

@@ -125,6 +125,10 @@ void guac_vnc_cut_text(rfbClient* client, const char* text, int textlen) {
     guac_client* gc = rfbClientGetClientData(client, GUAC_VNC_CLIENT_KEY);
     guac_vnc_client* vnc_client = (guac_vnc_client*) gc->data;
 
+    /* Ignore received text if outbound clipboard transfer is disabled */
+    if (vnc_client->settings->disable_copy)
+        return;
+
     char received_data[GUAC_VNC_CLIPBOARD_MAX_LENGTH];
 
     const char* input = text;