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/*
* 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.
*/
/*
* 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.
*/
/*
* Compile with:
*
* cc `gnome-config --cflags gnome gnomeui` \
* gnome-ssh-askpass1.c -o gnome-ssh-askpass \
* `gnome-config --libs gnome gnomeui`
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gnome.h>
#include <X11/Xlib.h>
#include <gdk/gdkx.h>
void
report_failed_grab (void)
{
GtkWidget *err;
err = gnome_message_box_new("Could not grab keyboard or mouse.\n"
"A malicious client may be eavesdropping on your session.",
GNOME_MESSAGE_BOX_ERROR, "EXIT", NULL);
gtk_window_set_position(GTK_WINDOW(err), GTK_WIN_POS_CENTER);
gtk_object_set(GTK_OBJECT(err), "type", GTK_WINDOW_POPUP, NULL);
gnome_dialog_run_and_close(GNOME_DIALOG(err));
}
int
passphrase_dialog(char *message)
{
char *passphrase;
char **messages;
int result, i, grab_server, grab_pointer;
GtkWidget *dialog, *entry, *label;
grab_server = (getenv("GNOME_SSH_ASKPASS_GRAB_SERVER") != NULL);
grab_pointer = (getenv("GNOME_SSH_ASKPASS_GRAB_POINTER") != NULL);
dialog = gnome_dialog_new("OpenSSH", GNOME_STOCK_BUTTON_OK,
GNOME_STOCK_BUTTON_CANCEL, NULL);
messages = g_strsplit(message, "\\n", 0);
if (messages)
for(i = 0; messages[i]; i++) {
label = gtk_label_new(messages[i]);
gtk_box_pack_start(GTK_BOX(GNOME_DIALOG(dialog)->vbox),
label, FALSE, FALSE, 0);
}
entry = gtk_entry_new();
gtk_box_pack_start(GTK_BOX(GNOME_DIALOG(dialog)->vbox), entry, FALSE,
FALSE, 0);
gtk_entry_set_visibility(GTK_ENTRY(entry), FALSE);
gtk_widget_grab_focus(entry);
/* Center window and prepare for grab */
gtk_object_set(GTK_OBJECT(dialog), "type", GTK_WINDOW_POPUP, NULL);
gnome_dialog_set_default(GNOME_DIALOG(dialog), 0);
gtk_window_set_position (GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);
gtk_window_set_policy(GTK_WINDOW(dialog), FALSE, FALSE, TRUE);
gnome_dialog_close_hides(GNOME_DIALOG(dialog), TRUE);
gtk_container_set_border_width(GTK_CONTAINER(GNOME_DIALOG(dialog)->vbox),
GNOME_PAD);
gtk_widget_show_all(dialog);
/* Grab focus */
if (grab_server)
XGrabServer(GDK_DISPLAY());
if (grab_pointer && gdk_pointer_grab(dialog->window, TRUE, 0,
NULL, NULL, GDK_CURRENT_TIME))
goto nograb;
if (gdk_keyboard_grab(dialog->window, FALSE, GDK_CURRENT_TIME))
goto nograbkb;
/* Make <enter> close dialog */
gnome_dialog_editable_enters(GNOME_DIALOG(dialog), GTK_EDITABLE(entry));
/* Run dialog */
result = gnome_dialog_run(GNOME_DIALOG(dialog));
/* Ungrab */
if (grab_server)
XUngrabServer(GDK_DISPLAY());
if (grab_pointer)
gdk_pointer_ungrab(GDK_CURRENT_TIME);
gdk_keyboard_ungrab(GDK_CURRENT_TIME);
gdk_flush();
/* Report passphrase if user selected OK */
passphrase = gtk_entry_get_text(GTK_ENTRY(entry));
if (result == 0)
puts(passphrase);
/* Zero passphrase in memory */
memset(passphrase, '\0', strlen(passphrase));
gtk_entry_set_text(GTK_ENTRY(entry), passphrase);
gnome_dialog_close(GNOME_DIALOG(dialog));
return (result == 0 ? 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_DISPLAY());
gnome_dialog_close(GNOME_DIALOG(dialog));
report_failed_grab();
return (-1);
}
int
main(int argc, char **argv)
{
char *message;
int result;
gnome_init("GNOME ssh-askpass", "0.1", argc, argv);
if (argc == 2)
message = argv[1];
else
message = "Enter your OpenSSH passphrase:";
setvbuf(stdout, 0, _IONBF, 0);
result = passphrase_dialog(message);
return (result);
}
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