2005-10-07 [colin] 1.9.15cvs20
[claws.git] / src / plugins / pgpcore / 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., 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 #include <sys/mman.h>
47
48 #include "passphrase.h"
49 #include "prefs_common.h"
50 #include "prefs_gpg.h"
51 #include "manage_window.h"
52 #include "utils.h"
53 #include "mainwindow.h"
54 #include "summaryview.h"
55
56 static gboolean grab_all = FALSE;
57
58 static gboolean pass_ack;
59 static gchar *last_pass = NULL;
60
61 static void passphrase_ok_cb(GtkWidget *widget, gpointer data);
62 static void passphrase_cancel_cb(GtkWidget *widget, gpointer data);
63 static gint passphrase_deleted(GtkWidget *widget, GdkEventAny *event,
64                                gpointer data);
65 static gboolean passphrase_key_pressed(GtkWidget *widget, GdkEventKey *event,
66                                        gpointer data);
67 static gchar* passphrase_mbox(const gchar *uid_hint, const gchar *pass_hint,
68                               gint prev_bad);
69
70 static GtkWidget *create_description(const gchar *uid_hint,
71                                      const gchar *pass_hint, gint prev_bad);
72
73 void
74 gpgmegtk_set_passphrase_grab(gint yes)
75 {
76     grab_all = yes;
77 }
78
79 static gchar*
80 passphrase_mbox(const gchar *uid_hint, const gchar *pass_hint, gint prev_bad)
81 {
82     gchar *the_passphrase = NULL;
83     GtkWidget *vbox;
84     GtkWidget *confirm_box;
85     GtkWidget *window;
86     GtkWidget *pass_entry;
87     GtkWidget *ok_button;
88     GtkWidget *cancel_button;
89
90     SummaryView *summaryview = mainwindow_get_mainwindow()->summaryview;
91     
92     gtk_menu_popdown(GTK_MENU(summaryview->popupmenu));
93
94     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
95     gtk_window_set_title(GTK_WINDOW(window), _("Passphrase"));
96     gtk_widget_set_size_request(window, 450, -1);
97     gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
98     gtk_window_set_modal(GTK_WINDOW(window), TRUE);
99     gtk_window_set_policy(GTK_WINDOW(window), FALSE, FALSE, FALSE);
100     g_signal_connect(G_OBJECT(window), "delete_event",
101                      G_CALLBACK(passphrase_deleted), NULL);
102     g_signal_connect(G_OBJECT(window), "key_press_event",
103                      G_CALLBACK(passphrase_key_pressed), NULL);
104     MANAGE_WINDOW_SIGNALS_CONNECT(window);
105     manage_window_set_transient(GTK_WINDOW(window));
106
107     vbox = gtk_vbox_new(FALSE, 8);
108     gtk_container_add(GTK_CONTAINER(window), vbox);
109     gtk_container_set_border_width(GTK_CONTAINER(vbox), 8);
110
111     if (uid_hint || pass_hint) {
112         GtkWidget *label;
113         label = create_description (uid_hint, pass_hint, prev_bad);
114         gtk_box_pack_start (GTK_BOX(vbox), label, FALSE, FALSE, 0);
115     }
116
117     pass_entry = gtk_entry_new();
118     gtk_box_pack_start(GTK_BOX(vbox), pass_entry, FALSE, FALSE, 0);
119     gtk_entry_set_visibility(GTK_ENTRY(pass_entry), FALSE);
120     gtk_widget_grab_focus(pass_entry);
121
122     gtkut_stock_button_set_create(&confirm_box, &ok_button, GTK_STOCK_OK,
123                                   &cancel_button, GTK_STOCK_CANCEL,
124                                   NULL, NULL);
125     gtk_box_pack_end(GTK_BOX(vbox), confirm_box, FALSE, FALSE, 0);
126     gtk_widget_grab_default(ok_button);
127
128     g_signal_connect(G_OBJECT(ok_button), "clicked",
129                      G_CALLBACK(passphrase_ok_cb), NULL);
130     g_signal_connect(G_OBJECT(pass_entry), "activate",
131                      G_CALLBACK(passphrase_ok_cb), NULL);
132     g_signal_connect(G_OBJECT(cancel_button), "clicked",
133                      G_CALLBACK(passphrase_cancel_cb), NULL);
134
135     gtk_window_set_position (GTK_WINDOW(window), GTK_WIN_POS_CENTER);
136     if (grab_all)   
137         gtk_window_set_policy (GTK_WINDOW(window), FALSE, FALSE, TRUE);
138     
139     gtk_widget_show_all(window);
140
141     if (grab_all) {
142         int err = 0, cnt = 0;
143         /* make sure that window is viewable */
144         gtk_widget_show_now(window);
145         gdk_flush();
146         while(gtk_events_pending())
147                 gtk_main_iteration();
148 #ifdef GDK_WINDOWING_X11
149         gdk_x11_display_grab(gdk_display_get_default());
150 #endif /* GDK_WINDOWING_X11 */
151 try_again:
152         if ((err = gdk_pointer_grab(window->window, TRUE, 0,
153                              window->window, NULL, GDK_CURRENT_TIME))) {
154             if (err == GDK_GRAB_NOT_VIEWABLE && cnt < 10) {
155                 cnt++;
156                 g_warning("trying to grab mouse again\n");
157                 goto try_again;
158             } else {
159 #ifdef GDK_WINDOWING_X11
160                 gdk_x11_display_ungrab(gdk_display_get_default());
161 #endif /* GDK_WINDOWING_X11 */
162                 g_warning("OOPS: Could not grab mouse\n");
163                 gtk_widget_destroy(window);
164                 return NULL;
165             }
166         }
167         if (gdk_keyboard_grab(window->window, FALSE, GDK_CURRENT_TIME)) {
168             gdk_display_pointer_ungrab(gdk_display_get_default(),
169                                        GDK_CURRENT_TIME);
170 #ifdef GDK_WINDOWING_X11
171             gdk_x11_display_ungrab(gdk_display_get_default());
172 #endif /* GDK_WINDOWING_X11 */
173             g_warning("OOPS: Could not grab keyboard\n");
174             gtk_widget_destroy(window);
175             return NULL;
176         }
177     }
178
179     gtk_main();
180
181     if (grab_all) {
182         gdk_display_keyboard_ungrab(gdk_display_get_default(),
183                                     GDK_CURRENT_TIME);
184         gdk_display_pointer_ungrab(gdk_display_get_default(), GDK_CURRENT_TIME);
185 #ifdef GDK_WINDOWING_X11
186         gdk_x11_display_ungrab(gdk_display_get_default());
187 #endif /* GDK_WINDOWING_X11 */
188         gdk_flush();
189     }
190
191     manage_window_focus_out(window, NULL, NULL);
192
193     if (pass_ack) {
194         const gchar *entry_text;
195         entry_text = gtk_entry_get_text(GTK_ENTRY(pass_entry));
196         if (entry_text) /* Hmmm: Do we really need this? */
197             the_passphrase = g_strdup (entry_text);
198     }
199     gtk_widget_destroy (window);
200
201     return the_passphrase;
202 }
203
204
205 static void 
206 passphrase_ok_cb(GtkWidget *widget, gpointer data)
207 {
208     pass_ack = TRUE;
209     gtk_main_quit();
210 }
211
212 static void 
213 passphrase_cancel_cb(GtkWidget *widget, gpointer data)
214 {
215     pass_ack = FALSE;
216     gtk_main_quit();
217 }
218
219
220 static gint
221 passphrase_deleted(GtkWidget *widget, GdkEventAny *event, gpointer data)
222 {
223     passphrase_cancel_cb(NULL, NULL);
224     return TRUE;
225 }
226
227
228 static gboolean
229 passphrase_key_pressed(GtkWidget *widget, GdkEventKey *event, gpointer data)
230 {
231     if (event && event->keyval == GDK_Escape)
232         passphrase_cancel_cb(NULL, NULL);
233     return FALSE;
234 }
235
236 static gint 
237 linelen (const gchar *s)
238 {
239     gint i;
240
241     for (i = 0; *s && *s != '\n'; s++, i++)
242         ;
243
244     return i;
245 }
246
247 static GtkWidget *
248 create_description(const gchar *uid_hint, const gchar *pass_hint, gint prev_bad)
249 {
250     const gchar *uid = NULL, *info = NULL;
251     gchar *buf;
252     GtkWidget *label;
253
254     if (!uid_hint)
255         uid = _("[no user id]");
256     else
257         uid = uid_hint;
258     if (!pass_hint)
259         info = "";
260     else
261         info = pass_hint;
262
263     buf = g_strdup_printf (_("%sPlease enter the passphrase for:\n\n"
264                            "  %.*s  \n"
265                            "(%.*s)\n"),
266                            prev_bad ?
267                            _("Bad passphrase! Try again...\n\n") : "",
268                            linelen (uid), uid, linelen (info), info);
269
270     label = gtk_label_new (buf);
271     gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
272     g_free (buf);
273
274     return label;
275 }
276
277 static int free_passphrase(gpointer _unused)
278 {
279     if (last_pass != NULL) {
280         munlock(last_pass, strlen(last_pass));
281         g_free(last_pass);
282         last_pass = NULL;
283         debug_print("%% passphrase removed");
284     }
285     
286     return FALSE;
287 }
288
289 gpgme_error_t
290 gpgmegtk_passphrase_cb(void *opaque, const char *uid_hint,
291         const char *passphrase_hint, int prev_bad, int fd)
292 {
293     const char *pass;
294
295     if (prefs_gpg_get_config()->store_passphrase && last_pass != NULL && !prev_bad) {
296         write(fd, last_pass, strlen(last_pass));
297         write(fd, "\n", 1);
298         return GPG_ERR_NO_ERROR;
299     }
300     gpgmegtk_set_passphrase_grab (prefs_gpg_get_config()->passphrase_grab);
301     debug_print ("%% requesting passphrase for '%s': ", uid_hint);
302     pass = passphrase_mbox (uid_hint, passphrase_hint, prev_bad);
303     gpgmegtk_free_passphrase();
304     if (!pass) {
305         debug_print ("%% cancel passphrase entry");
306         write(fd, "\n", 1);
307         return GPG_ERR_CANCELED;
308     }
309     else {
310         if (prefs_gpg_get_config()->store_passphrase) {
311             last_pass = g_strdup(pass);
312             if (mlock(last_pass, strlen(last_pass)) == -1)
313                 debug_print("%% locking passphrase failed");
314
315             if (prefs_gpg_get_config()->store_passphrase_timeout > 0) {
316                 gtk_timeout_add(prefs_gpg_get_config()->store_passphrase_timeout*60*1000,
317                                 free_passphrase, NULL);
318             }
319         }
320         debug_print ("%% sending passphrase");
321     }
322     write(fd, pass, strlen(pass));
323     write(fd, "\n", 1);
324     return GPG_ERR_NO_ERROR;
325 }
326
327 void gpgmegtk_free_passphrase()
328 {
329     (void)free_passphrase(NULL); /* could be inline */
330 }
331
332 #endif /* USE_GPGME */