2005-05-26 [colin] 1.9.11cvs13
[claws.git] / src / plugins / pgpmime / passphrase.c
1 /* passphrase.c - GTK+ based passphrase callback
2  *      Copyright (C) 2001 Werner Koch (dd9jn)
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17  */
18
19 #ifdef HAVE_CONFIG_H
20 #  include <config.h>
21 #endif
22
23 #if USE_GPGME
24
25 #include <glib.h>
26 #include <glib/gi18n.h>
27 #include <gdk/gdktypes.h>
28 #include <gdk/gdkkeysyms.h>
29 #include <gdk/gdkdisplay.h>
30 #ifdef GDK_WINDOWING_X11
31 #  include <gdk/gdkx.h>
32 #endif /* GDK_WINDOWING_X11 */
33 #include <gtk/gtkmain.h>
34 #include <gtk/gtkwidget.h>
35 #include <gtk/gtkwindow.h>
36 #include <gtk/gtkvbox.h>
37 #include <gtk/gtktable.h>
38 #include <gtk/gtklabel.h>
39 #include <gtk/gtkentry.h>
40 #include <gtk/gtkhbbox.h>
41 #include <gtk/gtkbutton.h>
42 #include <gtk/gtkfilesel.h>
43 #include <gtk/gtksignal.h>
44 #include <string.h>
45 #include <sys/types.h>
46 #include <sys/mman.h>
47
48 #include "passphrase.h"
49 #include "prefs_common.h"
50 #include "manage_window.h"
51 #include "utils.h"
52 #include "prefs_gpg.h"
53
54 static gboolean grab_all = FALSE;
55
56 static gboolean pass_ack;
57 static gchar *last_pass = NULL;
58
59 static void passphrase_ok_cb(GtkWidget *widget, gpointer data);
60 static void passphrase_cancel_cb(GtkWidget *widget, gpointer data);
61 static gint passphrase_deleted(GtkWidget *widget, GdkEventAny *event,
62                                gpointer data);
63 static gboolean passphrase_key_pressed(GtkWidget *widget, GdkEventKey *event,
64                                        gpointer data);
65 static gchar* passphrase_mbox (const gchar *desc);
66
67
68 static GtkWidget *create_description (const gchar *desc);
69
70 void
71 gpgmegtk_set_passphrase_grab(gint yes)
72 {
73     grab_all = yes;
74 }
75
76 static gchar*
77 passphrase_mbox (const gchar *desc)
78 {
79     gchar *the_passphrase = NULL;
80     GtkWidget *vbox;
81     GtkWidget *confirm_box;
82     GtkWidget *window;
83     GtkWidget *pass_entry;
84     GtkWidget *ok_button;
85     GtkWidget *cancel_button;
86     gint       grab_result;
87
88     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
89     gtk_window_set_title(GTK_WINDOW(window), _("Passphrase"));
90     gtk_widget_set_size_request(window, 450, -1);
91     gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
92     gtk_window_set_modal(GTK_WINDOW(window), TRUE);
93     gtk_window_set_resizable(GTK_WINDOW(window), FALSE);
94     g_signal_connect(G_OBJECT(window), "delete_event",
95                      G_CALLBACK(passphrase_deleted), NULL);
96     g_signal_connect(G_OBJECT(window), "key_press_event",
97                      G_CALLBACK(passphrase_key_pressed), NULL);
98     MANAGE_WINDOW_SIGNALS_CONNECT(window);
99     manage_window_set_transient(GTK_WINDOW(window));
100
101     vbox = gtk_vbox_new(FALSE, 8);
102     gtk_container_add(GTK_CONTAINER(window), vbox);
103     gtk_container_set_border_width(GTK_CONTAINER(vbox), 8);
104
105     if (desc) {
106         GtkWidget *label;
107         label = create_description (desc);
108         gtk_box_pack_start (GTK_BOX(vbox), label, FALSE, FALSE, 0);
109     }
110
111     pass_entry = gtk_entry_new();
112     gtk_box_pack_start(GTK_BOX(vbox), pass_entry, FALSE, FALSE, 0);
113     gtk_entry_set_visibility(GTK_ENTRY(pass_entry), FALSE);
114     gtk_widget_grab_focus(pass_entry);
115
116     gtkut_stock_button_set_create(&confirm_box, &ok_button, GTK_STOCK_OK,
117                                   &cancel_button, GTK_STOCK_CANCEL,
118                                   NULL, NULL);
119     gtk_box_pack_end(GTK_BOX(vbox), confirm_box, FALSE, FALSE, 0);
120     gtk_widget_grab_default(ok_button);
121
122     g_signal_connect(G_OBJECT(ok_button), "clicked",
123                      G_CALLBACK(passphrase_ok_cb), NULL);
124     g_signal_connect(G_OBJECT(pass_entry), "activate",
125                      G_CALLBACK(passphrase_ok_cb), NULL);
126     g_signal_connect(G_OBJECT(cancel_button), "clicked",
127                      G_CALLBACK(passphrase_cancel_cb), NULL);
128
129     gtk_window_set_position (GTK_WINDOW(window), GTK_WIN_POS_CENTER);
130     if (grab_all)   
131         gtk_window_set_resizable(GTK_WINDOW(window), FALSE);
132     
133     gtk_widget_show_all(window);
134
135     if (grab_all) {
136         int err, cnt = 0;
137 try_again:
138         /* make sure that window is viewable */
139         gtk_widget_show_now(window);
140         gdk_flush();
141         while(gtk_events_pending())
142                 gtk_main_iteration();
143         if (err = gdk_pointer_grab(window->window, TRUE, 0,
144                              window->window, NULL, GDK_CURRENT_TIME)) {
145             if (err == GDK_GRAB_NOT_VIEWABLE && cnt < 10) {
146                 /* HACK! */
147                 cnt++;
148                 g_warning("trying to grab mouse again\n");
149                 goto try_again;
150             } else {
151                 g_warning("OOPS: Could not grab mouse (%d)\n", err);
152                 gtk_widget_destroy(window);
153                 return NULL;
154             }
155         }
156         if (gdk_keyboard_grab(window->window, FALSE, GDK_CURRENT_TIME)) {
157             gdk_display_pointer_ungrab(gdk_display_get_default(),
158                                        GDK_CURRENT_TIME);
159             g_warning("OOPS: Could not grab keyboard\n");
160             gtk_widget_destroy(window);
161             return NULL;
162         }
163     }
164
165     gtk_main();
166
167     if (grab_all) {
168         gdk_display_keyboard_ungrab(gdk_display_get_default(),
169                                     GDK_CURRENT_TIME);
170         gdk_display_pointer_ungrab(gdk_display_get_default(), GDK_CURRENT_TIME);
171         gdk_flush();
172     }
173
174     manage_window_focus_out(window, NULL, NULL);
175
176     if (pass_ack) {
177         const gchar *entry_text = gtk_entry_get_text(GTK_ENTRY(pass_entry));
178         if (entry_text) /* Hmmm: Do we really need this? */
179             the_passphrase = g_strdup (entry_text);
180     }
181     gtk_widget_destroy (window);
182
183     return the_passphrase;
184 }
185
186
187 static void 
188 passphrase_ok_cb(GtkWidget *widget, gpointer data)
189 {
190     pass_ack = TRUE;
191     gtk_main_quit();
192 }
193
194 static void 
195 passphrase_cancel_cb(GtkWidget *widget, gpointer data)
196 {
197     pass_ack = FALSE;
198     gtk_main_quit();
199 }
200
201
202 static gint
203 passphrase_deleted(GtkWidget *widget, GdkEventAny *event, gpointer data)
204 {
205     passphrase_cancel_cb(NULL, NULL);
206     return TRUE;
207 }
208
209
210 static gboolean
211 passphrase_key_pressed(GtkWidget *widget, GdkEventKey *event, gpointer data)
212 {
213     if (event && event->keyval == GDK_Escape)
214         passphrase_cancel_cb(NULL, NULL);
215     return FALSE;
216 }
217
218 static gint 
219 linelen (const gchar *s)
220 {
221     gint i;
222
223     for (i = 0; *s && *s != '\n'; s++, i++)
224         ;
225
226     return i;
227 }
228
229 static GtkWidget *
230 create_description (const gchar *desc)
231 {
232     const gchar *cmd = NULL, *uid = NULL, *info = NULL;
233     gchar *buf;
234     GtkWidget *label;
235
236     cmd = desc;
237     uid = strchr (cmd, '\n');
238     if (uid) {
239         info = strchr (++uid, '\n');
240         if (info )
241             info++;
242     }
243
244     if (!uid)
245         uid = _("[no user id]");
246     if (!info)
247         info = "";
248
249     buf = g_strdup_printf (_("%sPlease enter the passphrase for:\n\n"
250                            "  %.*s  \n"
251                            "(%.*s)\n"),
252                            !strncmp (cmd, "TRY_AGAIN", 9 ) ?
253                            _("Bad passphrase! Try again...\n\n") : "",
254                            linelen (uid), uid, linelen (info), info);
255
256     label = gtk_label_new (buf);
257     gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
258     g_free (buf);
259
260     return label;
261 }
262
263 static int free_passphrase(gpointer _unused)
264 {
265     if (last_pass != NULL) {
266         munlock(last_pass, strlen(last_pass));
267         g_free(last_pass);
268         last_pass = NULL;
269         debug_print("%% passphrase removed");
270     }
271     
272     return FALSE;
273 }
274
275 const char*
276 gpgmegtk_passphrase_cb (void *opaque, const char *desc, void **r_hd)
277 {
278     struct passphrase_cb_info_s *info = opaque;
279     GpgmeCtx ctx = info ? info->c : NULL;
280     const char *pass;
281
282     if (!desc) {
283         /* FIXME: cleanup by looking at *r_hd */
284         return NULL;
285     }
286     if (prefs_gpg_get_config()->store_passphrase && last_pass != NULL &&
287         strncmp(desc, "TRY_AGAIN", 9) != 0)
288         return g_strdup(last_pass);
289
290     gpgmegtk_set_passphrase_grab (prefs_gpg_get_config()->passphrase_grab);
291     debug_print ("%% requesting passphrase for `%s': ", desc);
292     pass = passphrase_mbox (desc);
293     gpgmegtk_free_passphrase();
294     if (!pass) {
295         debug_print ("%% cancel passphrase entry");
296         gpgme_cancel (ctx);
297     }
298     else {
299         if (prefs_gpg_get_config()->store_passphrase) {
300             last_pass = g_strdup(pass);
301             if (mlock(last_pass, strlen(last_pass)) == -1)
302                 debug_print("%% locking passphrase failed");
303
304             if (prefs_gpg_get_config()->store_passphrase_timeout > 0) {
305                 gtk_timeout_add(prefs_gpg_get_config()->store_passphrase_timeout*60*1000,
306                                 free_passphrase, NULL);
307             }
308         }
309         debug_print ("%% sending passphrase");
310     }
311
312     return pass;
313 }
314
315 void gpgmegtk_free_passphrase(void)
316 {
317     (void)free_passphrase(NULL); /* could be inline */
318 }
319
320 #endif /* USE_GPGME */