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cc0583a1 | 1 | /* |
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 | /* | |
540d72c3 | 28 | * 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". | |
cc0583a1 | 31 | * |
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 | |
540d72c3 | 34 | * 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 | |
cc0583a1 | 36 | * you don't trust your X server. We grab the keyboard always. |
37 | */ | |
38 | ||
bfe49944 | 39 | #define GRAB_TRIES 16 |
40 | #define GRAB_WAIT 250 /* milliseconds */ | |
41 | ||
cc0583a1 | 42 | /* |
43 | * Compile with: | |
44 | * | |
bfe49944 | 45 | * cc -Wall `pkg-config --cflags gtk+-2.0` \ |
cc0583a1 | 46 | * gnome-ssh-askpass2.c -o gnome-ssh-askpass \ |
47 | * `pkg-config --libs gtk+-2.0` | |
48 | * | |
49 | */ | |
50 | ||
51 | #include <stdlib.h> | |
52 | #include <stdio.h> | |
53 | #include <string.h> | |
bfe49944 | 54 | #include <unistd.h> |
cc0583a1 | 55 | #include <X11/Xlib.h> |
56 | #include <gtk/gtk.h> | |
57 | #include <gdk/gdkx.h> | |
58 | ||
59 | static void | |
60 | report_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 | ||
79 | static void | |
80 | ok_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 | ||
86 | static int | |
87 | passphrase_dialog(char *message) | |
88 | { | |
89 | const char *failed; | |
90 | char *passphrase, *local; | |
bfe49944 | 91 | int result, grab_tries, grab_server, grab_pointer; |
92 | GtkWidget *dialog, *entry; | |
cc0583a1 | 93 | GdkGrabStatus status; |
94 | ||
95 | grab_server = (getenv("GNOME_SSH_ASKPASS_GRAB_SERVER") != NULL); | |
96 | grab_pointer = (getenv("GNOME_SSH_ASKPASS_GRAB_POINTER") != NULL); | |
bfe49944 | 97 | grab_tries = 0; |
cc0583a1 | 98 | |
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(); | |
540d72c3 | 106 | gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), entry, FALSE, |
cc0583a1 | 107 | 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); | |
cc0583a1 | 124 | if (grab_pointer) { |
bfe49944 | 125 | for(;;) { |
126 | status = gdk_pointer_grab( | |
540d72c3 | 127 | (GTK_WIDGET(dialog))->window, TRUE, 0, NULL, |
bfe49944 | 128 | 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 | } | |
cc0583a1 | 136 | } |
137 | } | |
bfe49944 | 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 | } | |
cc0583a1 | 148 | } |
bfe49944 | 149 | if (grab_server) { |
150 | gdk_x11_grab_server(); | |
151 | } | |
152 | ||
cc0583a1 | 153 | 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); | |
184 | return (result == GTK_RESPONSE_OK ? 0 : -1); | |
185 | ||
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); | |
197 | ||
198 | return (-1); | |
199 | } | |
200 | ||
201 | int | |
202 | main(int argc, char **argv) | |
203 | { | |
204 | char *message; | |
205 | int result; | |
206 | ||
207 | 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); | |
216 | result = passphrase_dialog(message); | |
217 | g_free(message); | |
218 | ||
219 | return (result); | |
220 | } |