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         /* make sure that window is viewable
 137          * FIXME: this is still not enough */
 138         gtk_widget_show_now(window);
 139         gdk_flush();
 140 #ifdef GDK_WINDOWING_X11
 141         gdk_x11_display_grab(gdk_display_get_default());
 142 #endif /* GDK_WINDOWING_X11 */
 143         if (gdk_pointer_grab(window->window, TRUE, 0,
 144                              window->window, NULL, GDK_CURRENT_TIME)) {
 145 #ifdef GDK_WINDOWING_X11
 146             gdk_x11_display_ungrab(gdk_display_get_default());
 147 #endif /* GDK_WINDOWING_X11 */
 148             g_warning("OOPS: Could not grab mouse\n");
 149             gtk_widget_destroy(window);
 150             return NULL;
 151         }
 152         if (gdk_keyboard_grab(window->window, FALSE, GDK_CURRENT_TIME)) {
 153             gdk_display_pointer_ungrab(gdk_display_get_default(),
 154                                        GDK_CURRENT_TIME);
 155 #ifdef GDK_WINDOWING_X11
 156             gdk_x11_display_ungrab(gdk_display_get_default());
 157 #endif /* GDK_WINDOWING_X11 */
 158             g_warning("OOPS: Could not grab keyboard\n");
 159             gtk_widget_destroy(window);
 160             return NULL;
 161         }
 162     }
 163
 164     gtk_main();
 165
 166     if (grab_all) {
 167         gdk_display_keyboard_ungrab(gdk_display_get_default(),
 168                                     GDK_CURRENT_TIME);
 169         gdk_display_pointer_ungrab(gdk_display_get_default(), GDK_CURRENT_TIME);
 170 #ifdef GDK_WINDOWING_X11
 171         gdk_x11_display_ungrab(gdk_display_get_default());
 172 #endif /* GDK_WINDOWING_X11 */
 173         gdk_flush();
 174     }
 175
 176     manage_window_focus_out(window, NULL, NULL);
 177
 178     if (pass_ack) {
 179         const gchar *entry_text = gtk_entry_get_text(GTK_ENTRY(pass_entry));
 180         if (entry_text) /* Hmmm: Do we really need this? */
 181             the_passphrase = g_strdup (entry_text);
 182     }
 183     gtk_widget_destroy (window);
 184
 185     return the_passphrase;
 186 }
 187
 188
 189 static void
 190 passphrase_ok_cb(GtkWidget *widget, gpointer data)
 191 {
 192     pass_ack = TRUE;
 193     gtk_main_quit();
 194 }
 195
 196 static void
 197 passphrase_cancel_cb(GtkWidget *widget, gpointer data)
 198 {
 199     pass_ack = FALSE;
 200     gtk_main_quit();
 201 }
 202
 203
 204 static gint
 205 passphrase_deleted(GtkWidget *widget, GdkEventAny *event, gpointer data)
 206 {
 207     passphrase_cancel_cb(NULL, NULL);
 208     return TRUE;
 209 }
 210
 211
 212 static gboolean
 213 passphrase_key_pressed(GtkWidget *widget, GdkEventKey *event, gpointer data)
 214 {
 215     if (event && event->keyval == GDK_Escape)
 216         passphrase_cancel_cb(NULL, NULL);
 217     return FALSE;
 218 }
 219
 220 static gint
 221 linelen (const gchar *s)
 222 {
 223     gint i;
 224
 225     for (i = 0; *s && *s != '\n'; s++, i++)
 226         ;
 227
 228     return i;
 229 }
 230
 231 static GtkWidget *
 232 create_description (const gchar *desc)
 233 {
 234     const gchar *cmd = NULL, *uid = NULL, *info = NULL;
 235     gchar *buf;
 236     GtkWidget *label;
 237
 238     cmd = desc;
 239     uid = strchr (cmd, '\n');
 240     if (uid) {
 241         info = strchr (++uid, '\n');
 242         if (info )
 243             info++;
 244     }
 245
 246     if (!uid)
 247         uid = _("[no user id]");
 248     if (!info)
 249         info = "";
 250
 251     buf = g_strdup_printf (_("%sPlease enter the passphrase for:\n\n"
 252                            "  %.*s  \n"
 253                            "(%.*s)\n"),
 254                            !strncmp (cmd, "TRY_AGAIN", 9 ) ?
 255                            _("Bad passphrase! Try again...\n\n") : "",
 256                            linelen (uid), uid, linelen (info), info);
 257
 258     label = gtk_label_new (buf);
 259     gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
 260     g_free (buf);
 261
 262     return label;
 263 }
 264
 265 static int free_passphrase(gpointer _unused)
 266 {
 267     if (last_pass != NULL) {
 268         munlock(last_pass, strlen(last_pass));
 269         g_free(last_pass);
 270         last_pass = NULL;
 271         debug_print("%% passphrase removed");
 272     }
 273
 274     return FALSE;
 275 }
 276
 277 const char*
 278 gpgmegtk_passphrase_cb (void *opaque, const char *desc, void **r_hd)
 279 {
 280     struct passphrase_cb_info_s *info = opaque;
 281     GpgmeCtx ctx = info ? info->c : NULL;
 282     const char *pass;
 283
 284     if (!desc) {
 285         /* FIXME: cleanup by looking at *r_hd */
 286         return NULL;
 287     }
 288     if (prefs_gpg_get_config()->store_passphrase && last_pass != NULL &&
 289         strncmp(desc, "TRY_AGAIN", 9) != 0)
 290         return g_strdup(last_pass);
 291
 292     gpgmegtk_set_passphrase_grab (prefs_gpg_get_config()->passphrase_grab);
 293     debug_print ("%% requesting passphrase for `%s': ", desc);
 294     pass = passphrase_mbox (desc);
 295     gpgmegtk_free_passphrase();
 296     if (!pass) {
 297         debug_print ("%% cancel passphrase entry");
 298         gpgme_cancel (ctx);
 299     }
 300     else {
 301         if (prefs_gpg_get_config()->store_passphrase) {
 302             last_pass = g_strdup(pass);
 303             if (mlock(last_pass, strlen(last_pass)) == -1)
 304                 debug_print("%% locking passphrase failed");
 305
 306             if (prefs_gpg_get_config()->store_passphrase_timeout > 0) {
 307                 gtk_timeout_add(prefs_gpg_get_config()->store_passphrase_timeout*60*1000,
 308                                 free_passphrase, NULL);
 309             }
 310         }
 311         debug_print ("%% sending passphrase");
 312     }
 313
 314     return pass;
 315 }
 316
 317 void gpgmegtk_free_passphrase(void)
 318 {
 319     (void)free_passphrase(NULL); /* could be inline */
 320 }
 321
 322 #endif /* USE_GPGME */