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-rw-r--r--contrib/gnome-ssh-askpass2.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/contrib/gnome-ssh-askpass2.c b/contrib/gnome-ssh-askpass2.c
new file mode 100644
index 0000000..535a692
--- /dev/null
+++ b/contrib/gnome-ssh-askpass2.c
@@ -0,0 +1,225 @@
+/*
+ * Copyright (c) 2000-2002 Damien Miller. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* GTK2 support by Nalin Dahyabhai <nalin@redhat.com> */
+
+/*
+ * This is a simple GNOME SSH passphrase grabber. To use it, set the
+ * environment variable SSH_ASKPASS to point to the location of
+ * gnome-ssh-askpass before calling "ssh-add < /dev/null".
+ *
+ * There is only two run-time options: if you set the environment variable
+ * "GNOME_SSH_ASKPASS_GRAB_SERVER=true" then gnome-ssh-askpass will grab
+ * the X server. If you set "GNOME_SSH_ASKPASS_GRAB_POINTER=true", then the
+ * pointer will be grabbed too. These may have some benefit to security if
+ * you don't trust your X server. We grab the keyboard always.
+ */
+
+#define GRAB_TRIES 16
+#define GRAB_WAIT 250 /* milliseconds */
+
+/*
+ * Compile with:
+ *
+ * cc -Wall `pkg-config --cflags gtk+-2.0` \
+ * gnome-ssh-askpass2.c -o gnome-ssh-askpass \
+ * `pkg-config --libs gtk+-2.0`
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <X11/Xlib.h>
+#include <gtk/gtk.h>
+#include <gdk/gdkx.h>
+
+static void
+report_failed_grab (GtkWidget *parent_window, const char *what)
+{
+ GtkWidget *err;
+
+ err = gtk_message_dialog_new(GTK_WINDOW(parent_window), 0,
+ GTK_MESSAGE_ERROR,
+ GTK_BUTTONS_CLOSE,
+ "Could not grab %s. "
+ "A malicious client may be eavesdropping "
+ "on your session.", what);
+ gtk_window_set_position(GTK_WINDOW(err), GTK_WIN_POS_CENTER);
+
+ gtk_dialog_run(GTK_DIALOG(err));
+
+ gtk_widget_destroy(err);
+}
+
+static void
+ok_dialog(GtkWidget *entry, gpointer dialog)
+{
+ g_return_if_fail(GTK_IS_DIALOG(dialog));
+ gtk_dialog_response(GTK_DIALOG(dialog), GTK_RESPONSE_OK);
+}
+
+static int
+passphrase_dialog(char *message)
+{
+ const char *failed;
+ char *passphrase, *local;
+ int result, grab_tries, grab_server, grab_pointer;
+ GtkWidget *parent_window, *dialog, *entry;
+ GdkGrabStatus status;
+
+ grab_server = (getenv("GNOME_SSH_ASKPASS_GRAB_SERVER") != NULL);
+ grab_pointer = (getenv("GNOME_SSH_ASKPASS_GRAB_POINTER") != NULL);
+ grab_tries = 0;
+
+ /* Create an invisible parent window so that GtkDialog doesn't
+ * complain. */
+ parent_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+
+ dialog = gtk_message_dialog_new(GTK_WINDOW(parent_window), 0,
+ GTK_MESSAGE_QUESTION,
+ GTK_BUTTONS_OK_CANCEL,
+ "%s",
+ message);
+
+ entry = gtk_entry_new();
+ gtk_box_pack_start(
+ GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))), entry,
+ FALSE, FALSE, 0);
+ gtk_entry_set_visibility(GTK_ENTRY(entry), FALSE);
+ gtk_widget_grab_focus(entry);
+ gtk_widget_show(entry);
+
+ gtk_window_set_title(GTK_WINDOW(dialog), "OpenSSH");
+ gtk_window_set_position (GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);
+ gtk_window_set_keep_above(GTK_WINDOW(dialog), TRUE);
+
+ /* Make <enter> close dialog */
+ gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_OK);
+ g_signal_connect(G_OBJECT(entry), "activate",
+ G_CALLBACK(ok_dialog), dialog);
+
+ gtk_window_set_keep_above(GTK_WINDOW(dialog), TRUE);
+
+ /* Grab focus */
+ gtk_widget_show_now(dialog);
+ if (grab_pointer) {
+ for(;;) {
+ status = gdk_pointer_grab(
+ (gtk_widget_get_window(GTK_WIDGET(dialog))), TRUE,
+ 0, NULL, NULL, GDK_CURRENT_TIME);
+ if (status == GDK_GRAB_SUCCESS)
+ break;
+ usleep(GRAB_WAIT * 1000);
+ if (++grab_tries > GRAB_TRIES) {
+ failed = "mouse";
+ goto nograb;
+ }
+ }
+ }
+ for(;;) {
+ status = gdk_keyboard_grab(
+ gtk_widget_get_window(GTK_WIDGET(dialog)), FALSE,
+ GDK_CURRENT_TIME);
+ if (status == GDK_GRAB_SUCCESS)
+ break;
+ usleep(GRAB_WAIT * 1000);
+ if (++grab_tries > GRAB_TRIES) {
+ failed = "keyboard";
+ goto nograbkb;
+ }
+ }
+ if (grab_server) {
+ gdk_x11_grab_server();
+ }
+
+ result = gtk_dialog_run(GTK_DIALOG(dialog));
+
+ /* Ungrab */
+ if (grab_server)
+ XUngrabServer(gdk_x11_get_default_xdisplay());
+ if (grab_pointer)
+ gdk_pointer_ungrab(GDK_CURRENT_TIME);
+ gdk_keyboard_ungrab(GDK_CURRENT_TIME);
+ gdk_flush();
+
+ /* Report passphrase if user selected OK */
+ passphrase = g_strdup(gtk_entry_get_text(GTK_ENTRY(entry)));
+ if (result == GTK_RESPONSE_OK) {
+ local = g_locale_from_utf8(passphrase, strlen(passphrase),
+ NULL, NULL, NULL);
+ if (local != NULL) {
+ puts(local);
+ memset(local, '\0', strlen(local));
+ g_free(local);
+ } else {
+ puts(passphrase);
+ }
+ }
+
+ /* Zero passphrase in memory */
+ memset(passphrase, '\b', strlen(passphrase));
+ gtk_entry_set_text(GTK_ENTRY(entry), passphrase);
+ memset(passphrase, '\0', strlen(passphrase));
+ g_free(passphrase);
+
+ gtk_widget_destroy(dialog);
+ return (result == GTK_RESPONSE_OK ? 0 : -1);
+
+ /* At least one grab failed - ungrab what we got, and report
+ the failure to the user. Note that XGrabServer() cannot
+ fail. */
+ nograbkb:
+ gdk_pointer_ungrab(GDK_CURRENT_TIME);
+ nograb:
+ if (grab_server)
+ XUngrabServer(gdk_x11_get_default_xdisplay());
+ gtk_widget_destroy(dialog);
+
+ report_failed_grab(parent_window, failed);
+
+ return (-1);
+}
+
+int
+main(int argc, char **argv)
+{
+ char *message;
+ int result;
+
+ gtk_init(&argc, &argv);
+
+ if (argc > 1) {
+ message = g_strjoinv(" ", argv + 1);
+ } else {
+ message = g_strdup("Enter your OpenSSH passphrase:");
+ }
+
+ setvbuf(stdout, 0, _IONBF, 0);
+ result = passphrase_dialog(message);
+ g_free(message);
+
+ return (result);
+}