blob: 0ce8daec9b144f653464216ccf6fadec26820ccc [file] [log] [blame]
Damien Miller44d5b602002-09-05 16:46:24 +10001/*
2 * Copyright (c) 2000-2002 Damien Miller. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25/* GTK2 support by Nalin Dahyabhai <nalin@redhat.com> */
26
27/*
Damien Millera8e06ce2003-11-21 23:48:55 +110028 * This is a simple GNOME SSH passphrase grabber. To use it, set the
29 * environment variable SSH_ASKPASS to point to the location of
30 * gnome-ssh-askpass before calling "ssh-add < /dev/null".
Damien Miller44d5b602002-09-05 16:46:24 +100031 *
32 * There is only two run-time options: if you set the environment variable
33 * "GNOME_SSH_ASKPASS_GRAB_SERVER=true" then gnome-ssh-askpass will grab
Damien Millera8e06ce2003-11-21 23:48:55 +110034 * the X server. If you set "GNOME_SSH_ASKPASS_GRAB_POINTER=true", then the
35 * pointer will be grabbed too. These may have some benefit to security if
Damien Miller44d5b602002-09-05 16:46:24 +100036 * you don't trust your X server. We grab the keyboard always.
37 */
38
Damien Miller07759762003-02-24 11:48:22 +110039#define GRAB_TRIES 16
40#define GRAB_WAIT 250 /* milliseconds */
41
Damien Miller44d5b602002-09-05 16:46:24 +100042/*
43 * Compile with:
44 *
Damien Miller07759762003-02-24 11:48:22 +110045 * cc -Wall `pkg-config --cflags gtk+-2.0` \
Damien Miller10f30852002-09-12 14:49:00 +100046 * gnome-ssh-askpass2.c -o gnome-ssh-askpass \
Damien Miller44d5b602002-09-05 16:46:24 +100047 * `pkg-config --libs gtk+-2.0`
48 *
49 */
50
51#include <stdlib.h>
52#include <stdio.h>
53#include <string.h>
Damien Miller07759762003-02-24 11:48:22 +110054#include <unistd.h>
Damien Miller44d5b602002-09-05 16:46:24 +100055#include <X11/Xlib.h>
56#include <gtk/gtk.h>
57#include <gdk/gdkx.h>
58
59static void
60report_failed_grab (const char *what)
61{
62 GtkWidget *err;
63
64 err = gtk_message_dialog_new(NULL, 0,
65 GTK_MESSAGE_ERROR,
66 GTK_BUTTONS_CLOSE,
67 "Could not grab %s. "
68 "A malicious client may be eavesdropping "
69 "on your session.", what);
70 gtk_window_set_position(GTK_WINDOW(err), GTK_WIN_POS_CENTER);
71 gtk_label_set_line_wrap(GTK_LABEL((GTK_MESSAGE_DIALOG(err))->label),
72 TRUE);
73
74 gtk_dialog_run(GTK_DIALOG(err));
75
76 gtk_widget_destroy(err);
77}
78
79static void
80ok_dialog(GtkWidget *entry, gpointer dialog)
81{
82 g_return_if_fail(GTK_IS_DIALOG(dialog));
83 gtk_dialog_response(GTK_DIALOG(dialog), GTK_RESPONSE_OK);
84}
85
Damien Miller10f30852002-09-12 14:49:00 +100086static int
Damien Miller44d5b602002-09-05 16:46:24 +100087passphrase_dialog(char *message)
88{
89 const char *failed;
90 char *passphrase, *local;
Damien Miller07759762003-02-24 11:48:22 +110091 int result, grab_tries, grab_server, grab_pointer;
92 GtkWidget *dialog, *entry;
Damien Miller44d5b602002-09-05 16:46:24 +100093 GdkGrabStatus status;
94
95 grab_server = (getenv("GNOME_SSH_ASKPASS_GRAB_SERVER") != NULL);
96 grab_pointer = (getenv("GNOME_SSH_ASKPASS_GRAB_POINTER") != NULL);
Damien Miller07759762003-02-24 11:48:22 +110097 grab_tries = 0;
Damien Miller44d5b602002-09-05 16:46:24 +100098
99 dialog = gtk_message_dialog_new(NULL, 0,
100 GTK_MESSAGE_QUESTION,
101 GTK_BUTTONS_OK_CANCEL,
102 "%s",
103 message);
104
105 entry = gtk_entry_new();
Damien Millera8e06ce2003-11-21 23:48:55 +1100106 gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), entry, FALSE,
Damien Miller44d5b602002-09-05 16:46:24 +1000107 FALSE, 0);
108 gtk_entry_set_visibility(GTK_ENTRY(entry), FALSE);
109 gtk_widget_grab_focus(entry);
110 gtk_widget_show(entry);
111
112 gtk_window_set_title(GTK_WINDOW(dialog), "OpenSSH");
113 gtk_window_set_position (GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);
114 gtk_label_set_line_wrap(GTK_LABEL((GTK_MESSAGE_DIALOG(dialog))->label),
115 TRUE);
116
117 /* Make <enter> close dialog */
118 gtk_dialog_set_default_response(GTK_DIALOG(dialog), GTK_RESPONSE_OK);
119 g_signal_connect(G_OBJECT(entry), "activate",
120 G_CALLBACK(ok_dialog), dialog);
121
122 /* Grab focus */
123 gtk_widget_show_now(dialog);
Damien Miller07759762003-02-24 11:48:22 +1100124 if (grab_pointer) {
125 for(;;) {
126 status = gdk_pointer_grab(
Damien Millera8e06ce2003-11-21 23:48:55 +1100127 (GTK_WIDGET(dialog))->window, TRUE, 0, NULL,
Damien Miller07759762003-02-24 11:48:22 +1100128 NULL, GDK_CURRENT_TIME);
129 if (status == GDK_GRAB_SUCCESS)
130 break;
131 usleep(GRAB_WAIT * 1000);
132 if (++grab_tries > GRAB_TRIES) {
133 failed = "mouse";
134 goto nograb;
135 }
136 }
137 }
138 for(;;) {
139 status = gdk_keyboard_grab((GTK_WIDGET(dialog))->window,
140 FALSE, GDK_CURRENT_TIME);
141 if (status == GDK_GRAB_SUCCESS)
142 break;
143 usleep(GRAB_WAIT * 1000);
144 if (++grab_tries > GRAB_TRIES) {
145 failed = "keyboard";
146 goto nograbkb;
147 }
148 }
Damien Miller44d5b602002-09-05 16:46:24 +1000149 if (grab_server) {
150 gdk_x11_grab_server();
151 }
Damien Miller07759762003-02-24 11:48:22 +1100152
Damien Miller44d5b602002-09-05 16:46:24 +1000153 result = gtk_dialog_run(GTK_DIALOG(dialog));
154
155 /* Ungrab */
156 if (grab_server)
157 XUngrabServer(GDK_DISPLAY());
158 if (grab_pointer)
159 gdk_pointer_ungrab(GDK_CURRENT_TIME);
160 gdk_keyboard_ungrab(GDK_CURRENT_TIME);
161 gdk_flush();
162
163 /* Report passphrase if user selected OK */
164 passphrase = g_strdup(gtk_entry_get_text(GTK_ENTRY(entry)));
165 if (result == GTK_RESPONSE_OK) {
166 local = g_locale_from_utf8(passphrase, strlen(passphrase),
167 NULL, NULL, NULL);
168 if (local != NULL) {
169 puts(local);
170 memset(local, '\0', strlen(local));
171 g_free(local);
172 } else {
173 puts(passphrase);
174 }
175 }
176
177 /* Zero passphrase in memory */
178 memset(passphrase, '\b', strlen(passphrase));
179 gtk_entry_set_text(GTK_ENTRY(entry), passphrase);
180 memset(passphrase, '\0', strlen(passphrase));
181 g_free(passphrase);
182
183 gtk_widget_destroy(dialog);
Damien Miller10f30852002-09-12 14:49:00 +1000184 return (result == GTK_RESPONSE_OK ? 0 : -1);
Damien Miller44d5b602002-09-05 16:46:24 +1000185
186 /* At least one grab failed - ungrab what we got, and report
187 the failure to the user. Note that XGrabServer() cannot
188 fail. */
189 nograbkb:
190 gdk_pointer_ungrab(GDK_CURRENT_TIME);
191 nograb:
192 if (grab_server)
193 XUngrabServer(GDK_DISPLAY());
194 gtk_widget_destroy(dialog);
195
196 report_failed_grab(failed);
Damien Miller10f30852002-09-12 14:49:00 +1000197
198 return (-1);
Damien Miller44d5b602002-09-05 16:46:24 +1000199}
200
201int
202main(int argc, char **argv)
203{
204 char *message;
Damien Miller10f30852002-09-12 14:49:00 +1000205 int result;
206
Damien Miller44d5b602002-09-05 16:46:24 +1000207 gtk_init(&argc, &argv);
208
209 if (argc > 1) {
210 message = g_strjoinv(" ", argv + 1);
211 } else {
212 message = g_strdup("Enter your OpenSSH passphrase:");
213 }
214
215 setvbuf(stdout, 0, _IONBF, 0);
Damien Miller10f30852002-09-12 14:49:00 +1000216 result = passphrase_dialog(message);
Damien Miller44d5b602002-09-05 16:46:24 +1000217 g_free(message);
218
Damien Miller10f30852002-09-12 14:49:00 +1000219 return (result);
Damien Miller44d5b602002-09-05 16:46:24 +1000220}