Clear global clipboard after specified seconds

fixes: QubesOS/qubes-issues#6641
alimirjamali · Nov 12, 2024 · b62251d · b62251d
1 parent 89d0254
commit b62251d
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Showing 2 changed files with 39 additions and 0 deletions.
diff --git a/gui-daemon/xside.c b/gui-daemon/xside.c
@@ -1274,6 +1274,38 @@ static void handle_clipboard_data(Ghandles * g, unsigned int untrusted_len)
     save_clipboard_file_xevent_timestamp(g->clipboard_xevent_time);
     metadata.successful = true;
     save_clipboard_metadata(&metadata);
+
+    if (g->clipboard_timeout > 0) {
+        switch (fork()) {
+            case -1:
+                perror("fork");
+                exit(1);
+            case 0:
+                struct stat st0, st1;
+                if (lstat(QUBES_CLIPBOARD_FILENAME, &st0) == -1) {
+                    perror("Can not get clipboard data file status");
+                    exit(1);
+                }
+                sleep(g->clipboard_timeout);
+                if (lstat(QUBES_CLIPBOARD_FILENAME, &st1) == -1) {
+                    perror("Can not get clipboard data file status");
+                    exit(1);
+                }
+                if (st0.st_mtime == st1.st_mtime) {
+                    inter_appviewer_lock(g, 1);
+                    old_umask = umask(0007);
+                    metadata.copy_action = false;
+                    clear_clipboard(&metadata);
+                    umask(old_umask);
+                    inter_appviewer_lock(g, 0);
+                    if (g->log_level > 1)
+                        fprintf(stderr, "Clipboard cleared after %d seconds\n",
+                            g->clipboard_timeout);
+                }
+                _exit(1);
+        }
+    }
+
 error:
     umask(old_umask);
     inter_appviewer_lock(g, 0);
@@ -4346,6 +4378,7 @@ static void load_default_config_values(Ghandles * g)
     g->paste_seq_mask = ControlMask | ShiftMask;
     g->paste_seq_key = XK_v;
     g->clipboard_buffer_size = DEFAULT_CLIPBOARD_BUFFER_SIZE;
+    g->clipboard_timeout = 0;
     g->allow_fullscreen = 0;
     g->override_redirect_protection = 1;
     g->startup_timeout = 45;
@@ -4430,6 +4463,11 @@ static void parse_vm_config(Ghandles * g, config_setting_t * group)
         }
     }
 
+    if ((setting =
+         config_setting_get_member(group, "clipboard_timeout"))) {
+        g->clipboard_timeout = config_setting_get_int(setting);
+    }
+
     if ((setting =
          config_setting_get_member(group, "allow_utf8_titles"))) {
         g->allow_utf8_titles = config_setting_get_bool(setting);

diff --git a/gui-daemon/xside.h b/gui-daemon/xside.h
@@ -220,6 +220,7 @@ struct _global_handles {
     KeySym paste_seq_key;    /* key for secure-paste key sequence */
     unsigned int clipboard_buffer_size;    /* maximum clipboard size limit */
     int qrexec_clipboard;    /* 0: use GUI protocol to fetch/put clipboard, 1: use qrexec */
+    int clipboard_timeout;    /* x: clear global clipboard after x seconds, 0: do not clear */
     int use_kdialog;    /* use kdialog for prompts (default on KDE) or zenity (default on non-KDE) */
     int prefix_titles;     /* prefix windows titles with VM name (for WM without support for _QUBES_VMNAME property) */
     enum trayicon_mode trayicon_mode; /* trayicon coloring mode */