2007-02-21 [colin] 2.7.2cvs60
[claws.git] / src / plugins / pgpcore / passphrase.c
1 /* passphrase.c - GTK+ based passphrase callback
2  *      Copyright (C) 2001-2007 Werner Koch (dd9jn) and the Claws Mail team
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 #ifdef G_OS_WIN32
47 #include <windows.h>
48 #else
49 #include <sys/mman.h>
50 #endif
51
52 #include "passphrase.h"
53 #include "prefs_common.h"
54 #include "prefs_gpg.h"
55 #include "manage_window.h"
56 #include "utils.h"
57 #include "mainwindow.h"
58 #include "summaryview.h"
59
60 static gboolean grab_all = FALSE;
61
62 static gboolean pass_ack;
63 static gchar *last_pass = NULL;
64
65 static void passphrase_ok_cb(GtkWidget *widget, gpointer data);
66 static void passphrase_cancel_cb(GtkWidget *widget, gpointer data);
67 static gint passphrase_deleted(GtkWidget *widget, GdkEventAny *event,
68                                gpointer data);
69 static gboolean passphrase_key_pressed(GtkWidget *widget, GdkEventKey *event,
70                                        gpointer data);
71
72 static GtkWidget *create_description(const gchar *uid_hint,
73                                      const gchar *pass_hint, gint prev_bad, gint new_key);
74
75 void
76 gpgmegtk_set_passphrase_grab(gint yes)
77 {
78     grab_all = yes;
79 }
80
81 gchar*
82 passphrase_mbox(const gchar *uid_hint, const gchar *pass_hint, gint prev_bad, gint new_key)
83 {
84     gchar *the_passphrase = NULL;
85     GtkWidget *vbox, *hbox;
86     GtkWidget *confirm_box;
87     GtkWidget *window;
88     GtkWidget *pass_entry;
89     GtkWidget *ok_button;
90     GtkWidget *cancel_button;
91
92     SummaryView *summaryview = mainwindow_get_mainwindow()->summaryview;
93     
94     gtk_menu_popdown(GTK_MENU(summaryview->popupmenu));
95
96     window = gtkut_window_new(GTK_WINDOW_TOPLEVEL, "passphrase");
97     gtk_window_set_title(GTK_WINDOW(window), _("Passphrase"));
98     gtk_window_set_default_size(GTK_WINDOW(window), 375, 100);
99     gtk_window_set_resizable(GTK_WINDOW(window), TRUE);
100     gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
101     gtk_window_set_modal(GTK_WINDOW(window), TRUE);
102     g_signal_connect(G_OBJECT(window), "delete_event",
103                      G_CALLBACK(passphrase_deleted), NULL);
104     g_signal_connect(G_OBJECT(window), "key_press_event",
105                      G_CALLBACK(passphrase_key_pressed), NULL);
106     MANAGE_WINDOW_SIGNALS_CONNECT(window);
107     manage_window_set_transient(GTK_WINDOW(window));
108
109     vbox = gtk_vbox_new(FALSE, 8);
110     gtk_container_add(GTK_CONTAINER(window), vbox);
111     gtk_container_set_border_width(GTK_CONTAINER(vbox), 8);
112
113     if (uid_hint || pass_hint) {
114         GtkWidget *label, *icon;
115         label = create_description (uid_hint, pass_hint, prev_bad, new_key);
116         icon = gtk_image_new_from_stock(GTK_STOCK_DIALOG_AUTHENTICATION,
117                                 GTK_ICON_SIZE_DIALOG); 
118
119         hbox = gtk_hbox_new (FALSE, 12);
120         gtk_container_set_border_width (GTK_CONTAINER (hbox), 5);
121         gtk_widget_show (hbox);
122         gtk_box_pack_start (GTK_BOX(hbox), icon, FALSE, FALSE, 0);
123         gtk_box_pack_start (GTK_BOX(hbox), label, FALSE, FALSE, 0);
124         gtk_box_pack_start (GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
125     }
126
127     pass_entry = gtk_entry_new();
128     gtk_box_pack_start(GTK_BOX(vbox), pass_entry, FALSE, FALSE, 0);
129     gtk_entry_set_visibility(GTK_ENTRY(pass_entry), FALSE);
130     gtk_widget_grab_focus(pass_entry);
131
132     gtkut_stock_button_set_create(&confirm_box, 
133                                   &cancel_button, GTK_STOCK_CANCEL,
134                                   &ok_button, GTK_STOCK_OK,
135                                   NULL, NULL);
136
137     gtk_box_pack_end(GTK_BOX(vbox), confirm_box, FALSE, FALSE, 0);
138     gtk_widget_grab_default(ok_button);
139
140     g_signal_connect(G_OBJECT(ok_button), "clicked",
141                      G_CALLBACK(passphrase_ok_cb), NULL);
142     g_signal_connect(G_OBJECT(pass_entry), "activate",
143                      G_CALLBACK(passphrase_ok_cb), NULL);
144     g_signal_connect(G_OBJECT(cancel_button), "clicked",
145                      G_CALLBACK(passphrase_cancel_cb), NULL);
146
147     gtk_window_set_position (GTK_WINDOW(window), GTK_WIN_POS_CENTER);
148     if (grab_all)   
149         gtk_window_set_resizable(GTK_WINDOW(window), FALSE);
150     
151     gtk_widget_show_all(window);
152
153     if (grab_all) {
154         int err = 0, cnt = 0;
155         /* make sure that window is viewable */
156         gtk_widget_show_now(window);
157         gdk_window_process_updates(window->window, TRUE);
158         gdk_flush();
159         while(gtk_events_pending()) {
160                 gtk_main_iteration();
161         }
162 try_again:
163         if ((err = gdk_pointer_grab(window->window, TRUE, 0,
164                              window->window, NULL, GDK_CURRENT_TIME))) {
165             if (err == GDK_GRAB_NOT_VIEWABLE && cnt < 10) {
166                 cnt++;
167                 g_warning("trying to grab mouse again\n");
168                 gtk_main_iteration();
169                 goto try_again;
170             } else {
171                 g_warning("OOPS: Could not grab mouse\n");
172                 gtk_widget_destroy(window);
173                 return NULL;
174             }
175         }
176         if (gdk_keyboard_grab(window->window, FALSE, GDK_CURRENT_TIME)) {
177             gdk_display_pointer_ungrab(gdk_display_get_default(),
178                                        GDK_CURRENT_TIME);
179             g_warning("OOPS: Could not grab keyboard\n");
180             gtk_widget_destroy(window);
181             return NULL;
182         }
183     }
184
185     gtk_main();
186
187     if (grab_all) {
188         gdk_display_keyboard_ungrab(gdk_display_get_default(),
189                                     GDK_CURRENT_TIME);
190         gdk_display_pointer_ungrab(gdk_display_get_default(), GDK_CURRENT_TIME);
191         gdk_flush();
192     }
193
194     manage_window_focus_out(window, NULL, NULL);
195
196     if (pass_ack) {
197         const gchar *entry_text;
198         entry_text = gtk_entry_get_text(GTK_ENTRY(pass_entry));
199         the_passphrase = g_locale_from_utf8(entry_text, -1, NULL, NULL, NULL);
200         if (the_passphrase == NULL) 
201             the_passphrase = g_strdup (entry_text);
202     }
203     gtk_widget_destroy (window);
204
205     return the_passphrase;
206 }
207
208
209 static void 
210 passphrase_ok_cb(GtkWidget *widget, gpointer data)
211 {
212     pass_ack = TRUE;
213     gtk_main_quit();
214 }
215
216 static void 
217 passphrase_cancel_cb(GtkWidget *widget, gpointer data)
218 {
219     pass_ack = FALSE;
220     gtk_main_quit();
221 }
222
223
224 static gint
225 passphrase_deleted(GtkWidget *widget, GdkEventAny *event, gpointer data)
226 {
227     passphrase_cancel_cb(NULL, NULL);
228     return TRUE;
229 }
230
231
232 static gboolean
233 passphrase_key_pressed(GtkWidget *widget, GdkEventKey *event, gpointer data)
234 {
235     if (event && event->keyval == GDK_Escape)
236         passphrase_cancel_cb(NULL, NULL);
237     return FALSE;
238 }
239
240 static gint 
241 linelen (const gchar *s)
242 {
243     gint i;
244
245     for (i = 0; *s && *s != '\n'; s++, i++)
246         ;
247
248     return i;
249 }
250
251 static GtkWidget *
252 create_description(const gchar *uid_hint, const gchar *pass_hint, gint prev_bad, gint new_key)
253 {
254     const gchar *uid = NULL, *info = NULL;
255     gchar *buf;
256     GtkWidget *label;
257     gchar *my_uid = NULL;
258     if (!uid_hint)
259         uid = _("[no user id]");
260     else
261         uid = uid_hint;
262     if (!pass_hint)
263         info = "";
264     else
265         info = pass_hint;
266
267     my_uid = g_strdup(uid);
268     while (strchr(my_uid, '<')) 
269         *(strchr(my_uid, '<')) = '(';
270     while (strchr(my_uid, '>')) 
271         *(strchr(my_uid, '>')) = ')';
272
273     if (new_key == 1) {
274             buf = g_strdup_printf (_("<span weight=\"bold\" size=\"larger\">%sPlease enter the passphrase for the new key:</span>\n\n"
275                            "%.*s\n"),
276                            prev_bad ?
277                            _("Passphrases did not match.\n") : "",
278                            linelen (my_uid), my_uid);
279     } else if (new_key == 2) {
280             buf = g_strdup_printf (_("<span weight=\"bold\" size=\"larger\">Please re-enter the passphrase for the new key:</span>\n\n"
281                            "%.*s\n"),
282                            linelen (my_uid), my_uid);
283     } else {
284             buf = g_strdup_printf (_("<span weight=\"bold\" size=\"larger\">%sPlease enter the passphrase for:</span>\n\n"
285                            "%.*s\n"),
286                            prev_bad ?
287                            _("Bad passphrase.\n") : "",
288                            linelen (my_uid), my_uid);
289     }
290     g_free(my_uid);
291     label = gtk_label_new (buf);
292     gtk_label_set_use_markup(GTK_LABEL (label), TRUE);
293     gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
294     gtk_label_set_line_wrap(GTK_LABEL (label), TRUE);
295     g_free (buf);
296
297     return label;
298 }
299
300 static int free_passphrase(gpointer _unused)
301 {
302     if (last_pass != NULL) {
303 #ifndef G_PLATFORM_WIN32
304         munlock(last_pass, strlen(last_pass));
305 #endif
306         g_free(last_pass);
307         last_pass = NULL;
308         debug_print("%% passphrase removed\n");
309     }
310     
311     return FALSE;
312 }
313
314 gpgme_error_t
315 gpgmegtk_passphrase_cb(void *opaque, const char *uid_hint,
316         const char *passphrase_hint, int prev_bad, int fd)
317 {
318     const char *pass;
319
320     if (prefs_gpg_get_config()->store_passphrase && last_pass && !prev_bad)
321         pass = last_pass;
322     else {
323     gpgmegtk_set_passphrase_grab (prefs_gpg_get_config()->passphrase_grab);
324     debug_print ("%% requesting passphrase for '%s'\n ", uid_hint);
325     pass = passphrase_mbox (uid_hint, passphrase_hint, prev_bad, FALSE);
326     gpgmegtk_free_passphrase();
327     if (!pass) {
328         debug_print ("%% cancel passphrase entry\n");
329         write(fd, "\n", 1);
330         return GPG_ERR_CANCELED;
331     }
332     else {
333         if (prefs_gpg_get_config()->store_passphrase) {
334             last_pass = g_strdup(pass);
335 #ifndef G_PLATFORM_WIN32
336             if (mlock(last_pass, strlen(last_pass)) == -1)
337                 debug_print("%% locking passphrase failed\n");
338 #endif
339             if (prefs_gpg_get_config()->store_passphrase_timeout > 0) {
340                     g_timeout_add(prefs_gpg_get_config()
341                                   ->store_passphrase_timeout*60*1000,
342                                   free_passphrase, NULL);
343             }
344         }
345         debug_print ("%% sending passphrase\n");
346     }
347     }
348
349 #ifdef G_OS_WIN32
350     {
351         /* Under Windows FD is actually a System handle. */
352         DWORD nwritten;
353         WriteFile ((HANDLE)fd, pass, strlen (pass), &nwritten, NULL);
354         WriteFile ((HANDLE)fd, "\n", 1, &nwritten, NULL);
355     }
356 #else
357     write(fd, pass, strlen(pass));
358     write(fd, "\n", 1);
359 #endif
360     g_free(pass);
361
362     return GPG_ERR_NO_ERROR;
363 }
364
365 void gpgmegtk_free_passphrase()
366 {
367     (void)free_passphrase(NULL); /* could be inline */
368 }
369
370 #endif /* USE_GPGME */