tour own askpass gui - tomb - the crypto undertaker
(HTM) git clone git://parazyd.org/tomb.git
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---
(DIR) commit 650ce60587c5c0a6800fbd5ddd1a9c8a1977e77a
(DIR) parent 36565e2ef4894c996a29d18f49aae2cfc6fd0c61
(HTM) Author: Jaromil <jaromil@dyne.org>
Date: Sun, 16 Jan 2011 23:44:13 +0100
our own askpass gui
Diffstat:
A src/tomb-askpass.c | 332 +++++++++++++++++++++++++++++++
1 file changed, 332 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/src/tomb-askpass.c b/src/tomb-askpass.c
t@@ -0,0 +1,332 @@
+/* Tomb askpass
+
+ Derived from gtk-led-askpass.c version 0.9
+ by Dafydd Harries <daf@muse.19inch.net>, 2003 2004
+ (An ssh-askpass alike software)
+
+ Based on ideas from ssh-askpass-gnome, by Damien Miller and Nalin Dahyabhai,
+ and on Jim Knoble's x11-ssh-askpass.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation, Inc.,
+ 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ See also:
+
+ http://www.cgabriel.org/sw/gtk2-ssh-askpass/
+ -- Jim Knoble's x11-ssh-askpass
+ http://www.cgabriel.org/sw/gtk2-ssh-askpass/
+ -- Christopher Gabriel's gtk2-ssh-askpass
+
+ Todo:
+
+ - Internationalise. Probably entails autotoolising.
+ - Add more eye candy.
+ - Implement optional mouse/server grabbing.
+ - Alow overriding the title on the command line.
+ - Make the LED box a proper GTK+ widget.
+
+*/
+
+#include <gdk/gdk.h>
+#include <gtk/gtk.h>
+#include <gdk/gdkkeysyms.h>
+
+/* The Tomb icon is an artwork by Jordi aka MonMort
+ a nomadic graffiti artist from Barcelona */
+#include <monmort.xpm>
+
+/* Title for the dialog. */
+#define TITLE "Unlocking tomb"
+
+/* Width of each LED. */
+#define LED_WIDTH 8
+/* Height of each LED. */
+#define LED_HEIGHT 16
+/* Space around and between LEDs. */
+#define LED_MARGIN 5
+/* Number of LEDs to have. */
+#define LED_COUNT 12
+
+/* How many times to attempt to grab the keyboard before giving up. */
+#define GRAB_TRIES_MAX 10
+/* How long to sleep, in microseconds, in between keyboard grab attempts. */
+#define GRAB_SLEEP 100000
+/* Sleep length, in milliseconds, after Control-U press. */
+#define CLEAR_SLEEP 800
+
+enum {
+ LED_STATE_OFF,
+ LED_STATE_GREEN,
+ LED_STATE_RED,
+ LED_STATES
+};
+
+GdkPixbuf *pb_monmort;
+
+GdkColor colours[LED_STATES] = {
+ /* LED_STATE_OFF */
+ { 0, 0x3333, 0x6666, 0x3333 },
+ /* LED_STATE_GREEN */
+ { 0, 0x6666, 0xFFFF, 0x6666 },
+ /* LED_STATE_RED */
+ { 0, 0xDDDD, 0x3333, 0x3333 }
+};
+
+
+void draw_led(GtkWidget *widget, gint state, guint offset)
+{
+ GdkGC *gc = gdk_gc_new(widget->window);
+
+ /* Draw the border. */
+ gdk_draw_rectangle(widget->window,
+ widget->style->fg_gc[GTK_WIDGET_STATE(widget)],
+ FALSE,
+ LED_MARGIN + offset * (LED_WIDTH + LED_MARGIN),
+ LED_MARGIN,
+ LED_WIDTH,
+ LED_HEIGHT);
+
+ gdk_gc_set_rgb_fg_color(gc, &(colours[state]));
+
+ /* Draw the inside rectangle. */
+ gdk_draw_rectangle(widget->window,
+ gc,
+ TRUE,
+ LED_MARGIN + offset * (LED_WIDTH + LED_MARGIN) + 1,
+ LED_MARGIN + 1,
+ LED_WIDTH - 1,
+ LED_HEIGHT - 1);
+}
+
+gboolean led_area_expose_handler(GtkWidget *led_area, GdkEventExpose *event,
+ GString *passphrase)
+{
+ gint i, width, height;
+ gint length = passphrase->len;
+
+ gdk_drawable_get_size(GDK_DRAWABLE(led_area->window), &width, &height);
+
+ /* Draw a focus indicator if appropriate. */
+ if (GTK_WIDGET_HAS_FOCUS(led_area))
+ gtk_paint_focus(led_area->style, led_area->window,
+ GTK_WIDGET_STATE(led_area), &(event->area), led_area,
+ "", 0, 0, width, height);
+
+ /* Draw each LED. */
+ for (i = 0; i < LED_COUNT; i++) {
+ /* This is the complicated bit. */
+ gboolean on = ((length / LED_COUNT) % 2 == 0) ?
+ (length % LED_COUNT > i) :
+ (length % LED_COUNT <= i);
+
+ draw_led(led_area, on ? LED_STATE_GREEN : LED_STATE_OFF, i);
+ }
+
+ /* TRUE means not to propagate the event. */
+ return TRUE;
+}
+
+gboolean timeout_handler(GtkWidget *led_area)
+{
+ gtk_widget_queue_draw(led_area);
+
+ return FALSE;
+}
+
+void clear(GString *passphrase, GtkWidget *led_area)
+{
+ gint i;
+
+ /*
+ Delete bit by bit to ensure erasure. g_string_erase() will overwrite
+ the last character with 0, so we shouldn't need to worry about leaving
+ sensitive data in memory. Note that the string may be empty. This is
+ so that the interface responds consistently.
+ */
+ while (passphrase->len > 0)
+ g_string_erase(passphrase, passphrase->len - 1, 1);
+
+ for (i = 0; i < LED_COUNT; i++)
+ draw_led(led_area, LED_STATE_RED, i);
+
+ /*
+ Remove the redness after a delay. If an exposure is triggered, such as
+ by a key getting pressed, then the redraw will simply happen early.
+ */
+ gtk_timeout_add(CLEAR_SLEEP, (GtkFunction)timeout_handler, led_area);
+}
+
+gboolean led_area_key_press_handler(GtkWidget *led_area, GdkEventKey *event,
+ GString *passphrase) {
+ /* Obtain Unicode representation of key released. */
+ gunichar c = gdk_keyval_to_unicode(event->keyval);
+ /* Determine whether the key released was printable. */
+ gint isprint = g_unichar_isprint(c);
+ /* Obtain default modifier mask. */
+ guint modifiers = gtk_accelerator_get_default_mod_mask();
+
+ if (event->keyval == GDK_Delete) {
+ clear(passphrase, led_area);
+ return TRUE;
+ }
+
+ if ((event->state & modifiers) == GDK_CONTROL_MASK) {
+
+ if (event->keyval == GDK_u) {
+ /* C-u -- delete everything. */
+ clear(passphrase, led_area);
+ /* Return early in order to avoid the redraw. */
+ return TRUE;
+
+ } else {
+
+ /* Unrecognised keypress. */
+ return FALSE;
+ }
+
+ } else if (event->keyval == GDK_BackSpace && passphrase->len > 0) {
+ /*
+ Backspace -- remove last character. See the comment above
+ about g_string_erase.
+ */
+ g_string_erase(passphrase, passphrase->len - 1, 1);
+ } else if (isprint) {
+ /* Printable character. */
+ g_string_append_unichar(passphrase, c);
+ } else {
+ /* Unrecognized keypress, propagate. */
+ return FALSE;
+ }
+
+ /* Trigger a redraw of the LED area. */
+ gtk_widget_queue_draw(led_area);
+
+ /* TRUE means not to propagate the event. */
+ return TRUE;
+}
+
+gboolean led_area_button_press_handler(GtkWidget *led_area,
+ GdkEventButton *event, gpointer data)
+{
+ gtk_widget_grab_focus(led_area);
+
+ return TRUE;
+}
+
+int main(int argc, char *argv[])
+{
+ gint response, grab_tries, i;
+ char keyname[256];
+ GString *passphrase = g_string_new("");
+ GtkWidget *dialog, *alignment, *led_area;
+ GList tmplist;
+
+ gtk_set_locale();
+ gtk_init(&argc, &argv);
+
+ if (argc > 1) {
+ snprintf(keyname,255,"%s",argv[1]);
+ } else {
+ sprintf(keyname,"unknown");
+ }
+ /*
+ dialog
+ `- vbox (implicit)
+ `- aligment
+ `- led_area
+ */
+
+ /* Question dialog with no parent; OK and Cancel buttons. */
+ dialog = gtk_message_dialog_new_with_markup
+ (NULL, 0, GTK_MESSAGE_QUESTION, GTK_BUTTONS_OK,
+ "Enter the password to unlock\n"
+ "<span font=\"Times 24\">%s</span>", keyname);
+ gtk_window_set_title(GTK_WINDOW(dialog), TITLE);
+
+ // set and show the image icon
+ pb_monmort = gdk_pixbuf_new_from_xpm_data(monmort);
+ tmplist.data = (gpointer*)pb_monmort;
+ tmplist.prev = tmplist.next = NULL;
+ gtk_window_set_icon_list(GTK_WINDOW(dialog), &tmplist);
+ gtk_message_dialog_set_image(GTK_MESSAGE_DIALOG(dialog),
+ gtk_image_new_from_pixbuf(pb_monmort));
+
+ /* Place the dialog in the middle of the screen. */
+ gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);
+ /* OK is the default action. */
+ gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_OK);
+
+ /* Add some spacing within the dialog's vbox. */
+ gtk_box_set_spacing(GTK_BOX(GTK_DIALOG(dialog)->vbox), 3);
+
+ /* The alignment widget containing the drawing area. */
+ alignment = gtk_alignment_new(0.5, 0.5, 0, 0);
+ gtk_container_add(GTK_CONTAINER(GTK_DIALOG(dialog)->vbox), alignment);
+
+ /* The drawing area for the LEDs. */
+ led_area = gtk_drawing_area_new();
+ gtk_container_add(GTK_CONTAINER(alignment), led_area);
+ /* Make the LED widget focusable. */
+ GTK_WIDGET_SET_FLAGS(led_area, GTK_CAN_FOCUS);
+ /* Make the LED widget focused. */
+ gtk_widget_grab_focus(led_area);
+ /* Make the LED widget receive key press and button press events. */
+ gtk_widget_add_events(led_area,
+ GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK);
+ /* Set a size request. */
+ gtk_widget_set_size_request(led_area,
+ LED_MARGIN + (LED_WIDTH + LED_MARGIN) * LED_COUNT,
+ LED_HEIGHT + LED_MARGIN * 2);
+ /* Set up handler for key releases. */
+ g_signal_connect(G_OBJECT(led_area), "key_press_event",
+ G_CALLBACK(led_area_key_press_handler), passphrase);
+ /* Set up handler for button releases. */
+ g_signal_connect(G_OBJECT(led_area), "button_press_event",
+ G_CALLBACK(led_area_button_press_handler), NULL);
+ /* Set up handler for expose events. */
+ g_signal_connect(G_OBJECT(led_area), "expose_event",
+ G_CALLBACK(led_area_expose_handler), passphrase);
+
+
+ /* Show all the widgets. */
+ gtk_widget_show_all(dialog);
+ /* Put the dialog on the screen now for the grab to work. */
+ gtk_widget_show_now(dialog);
+
+ /* Grab the keyboard */
+ gdk_keyboard_grab(GTK_WIDGET(dialog)->window, FALSE, GDK_CURRENT_TIME);
+
+ /* Make the dialog stay on top. */
+ gtk_window_set_keep_above(GTK_WINDOW(dialog), TRUE);
+
+ /* Run the dialog. */
+ response = gtk_dialog_run(GTK_DIALOG(dialog));
+
+ /* Ungrab the keyboard. */
+ gdk_keyboard_ungrab(GDK_CURRENT_TIME);
+
+ /* If the OK button was pressed, print the passphrase. */
+ if (response == GTK_RESPONSE_OK)
+ g_print("%s\n", passphrase->str);
+
+ /* Scrub the passphrase, if any. */
+ for (i = 0; i < passphrase->len; i++)
+ passphrase->str[i] = '\0';
+
+ if (response == GTK_RESPONSE_OK)
+ return 0;
+
+ return 1;
+}
+