From 29a073493aafc26c2576a928681364d9652d2830 Mon Sep 17 00:00:00 2001
From: moson-mo <mo-son@mailbox.org>
Date: Fri, 26 Jan 2024 15:48:27 +0100
Subject: [PATCH] Add option to display Master key

Signed-off-by: moson-mo <mo-son@mailbox.org>
---
 src/Gocrypt.vala          | 18 ++++++++++++++++++
 src/ui/CryptorWindow.vala | 16 +++++++++++++++-
 src/ui/Utils.vala         | 13 +++++++++++++
 3 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/src/Gocrypt.vala b/src/Gocrypt.vala
index 4547387..38dbda2 100644
--- a/src/Gocrypt.vala
+++ b/src/Gocrypt.vala
@@ -70,6 +70,24 @@ namespace Cryptor {
             }
         }
 
+        public static string ? get_master_key (string path, string password) throws Error {
+            string ? standard_output, standard_error;
+            string[] cmd = { "gocryptfs-xray", "-dumpmasterkey", path + "/gocryptfs.conf" };
+
+            var sp = new Subprocess.newv (cmd, SubprocessFlags.STDIN_PIPE | SubprocessFlags.STDERR_PIPE | SubprocessFlags.STDOUT_PIPE);
+            sp.communicate_utf8 (password + "\n", null, out standard_output, out standard_error);
+            var status = sp.get_exit_status ();
+
+            if (standard_error != null && standard_error != "") {
+                throw new Error (Quark.from_string ("Cryptor"), status, standard_error);
+            }
+            if (status != 0) {
+                throw new Error (Quark.from_string ("Cryptor"), status, standard_output);
+            }
+
+            return standard_output;
+        }
+
         private static File write_password_file (string password) throws Error {
             FileIOStream ps;
             var temp_file = File.new_tmp (null, out ps);
diff --git a/src/ui/CryptorWindow.vala b/src/ui/CryptorWindow.vala
index 5d8eea6..6bb4631 100644
--- a/src/ui/CryptorWindow.vala
+++ b/src/ui/CryptorWindow.vala
@@ -30,7 +30,7 @@ namespace Cryptor.UI {
 
         public CryptorWindow (Gtk.Application app) {
             Object (
-                application: app
+                application : app
             );
 
             config = new Config ();
@@ -293,6 +293,19 @@ namespace Cryptor.UI {
             edit.activate.connect (() => {
                 show_vault_window (get_selected_rownumber ());
             });
+            var mkey = Utils.get_image_menu_item ("gtk-justify-fill", _("Show Master key"));
+            mkey.activate.connect (() => {
+                var password = Utils.show_password_entry (this, false, false);
+                if (password == null) {
+                    return;
+                }
+                try {
+                    var key = Gocrypt.get_master_key (vault.path, password);
+                    Utils.show_info_textbox (this, _("Master key:"), key.replace ("\n", ""));
+                } catch (Error e) {
+                    Utils.show_error (this, e.message);
+                }
+            });
             var remove = Utils.get_image_menu_item ("gtk-remove", _("Remove"));
             remove.sensitive = !vault.is_mounted;
             remove.activate.connect (() => {
@@ -301,6 +314,7 @@ namespace Cryptor.UI {
             });
             menu.add (open);
             menu.add (mount);
+            menu.add (mkey);
             menu.add (edit);
             menu.add (remove);
             menu.show_all ();
diff --git a/src/ui/Utils.vala b/src/ui/Utils.vala
index 833c623..5f7ebf9 100644
--- a/src/ui/Utils.vala
+++ b/src/ui/Utils.vala
@@ -33,6 +33,19 @@ namespace Cryptor.UI {
             dialog.destroy ();
         }
 
+        public static void show_info_textbox (Window parent, string title, string message) {
+            var dialog = new MessageDialog (parent, Gtk.DialogFlags.MODAL, Gtk.MessageType.INFO, Gtk.ButtonsType.OK, "%s", title);
+            var area = dialog.get_content_area ();
+            var entry = new Entry ();
+            entry.editable = false;
+            entry.width_chars = message.length;
+            entry.text = message;
+            area.pack_end (entry, false, false, 0);
+            dialog.show_all ();
+            dialog.run ();
+            dialog.destroy ();
+        }
+
         public static string ? show_password_entry (Window parent, bool reenter, bool newpw) {
             string message;
             string ? ret = null;