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., 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 "prefs_gpg.h"
  51 #include "manage_window.h"
  52 #include "utils.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 *uid_hint, const gchar *pass_hint,
  66                               gint prev_bad);
  67
  68 static GtkWidget *create_description(const gchar *uid_hint,
  69                                      const gchar *pass_hint, gint prev_bad);
  70
  71 void
  72 gpgmegtk_set_passphrase_grab(gint yes)
  73 {
  74     grab_all = yes;
  75 }
  76
  77 static gchar*
  78 passphrase_mbox(const gchar *uid_hint, const gchar *pass_hint, gint prev_bad)
  79 {
  80     gchar *the_passphrase = NULL;
  81     GtkWidget *vbox;
  82     GtkWidget *confirm_box;
  83     GtkWidget *window;
  84     GtkWidget *pass_entry;
  85     GtkWidget *ok_button;
  86     GtkWidget *cancel_button;
  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_policy(GTK_WINDOW(window), FALSE, FALSE, 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 (uid_hint || pass_hint) {
 106         GtkWidget *label;
 107         label = create_description (uid_hint, pass_hint, prev_bad);
 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_policy (GTK_WINDOW(window), FALSE, FALSE, TRUE);
 132
 133     gtk_widget_show_all(window);
 134
 135     if (grab_all) {
 136         int err = 0, cnt = 0;
 137         /* make sure that window is viewable */
 138         gtk_widget_show_now(window);
 139         gdk_flush();
 140         while(gtk_events_pending())
 141                 gtk_main_iteration();
 142 #ifdef GDK_WINDOWING_X11
 143         gdk_x11_display_grab(gdk_display_get_default());
 144 #endif /* GDK_WINDOWING_X11 */
 145 try_again:
 146         if ((err = gdk_pointer_grab(window->window, TRUE, 0,
 147                              window->window, NULL, GDK_CURRENT_TIME))) {
 148             if (err == GDK_GRAB_NOT_VIEWABLE && cnt < 10) {
 149                 cnt++;
 150                 g_warning("trying to grab mouse again\n");
 151                 goto try_again;
 152             } else {
 153 #ifdef GDK_WINDOWING_X11
 154                 gdk_x11_display_ungrab(gdk_display_get_default());
 155 #endif /* GDK_WINDOWING_X11 */
 156                 g_warning("OOPS: Could not grab mouse\n");
 157                 gtk_widget_destroy(window);
 158                 return NULL;
 159             }
 160         }
 161         if (gdk_keyboard_grab(window->window, FALSE, GDK_CURRENT_TIME)) {
 162             gdk_display_pointer_ungrab(gdk_display_get_default(),
 163                                        GDK_CURRENT_TIME);
 164 #ifdef GDK_WINDOWING_X11
 165             gdk_x11_display_ungrab(gdk_display_get_default());
 166 #endif /* GDK_WINDOWING_X11 */
 167             g_warning("OOPS: Could not grab keyboard\n");
 168             gtk_widget_destroy(window);
 169             return NULL;
 170         }
 171     }
 172
 173     gtk_main();
 174
 175     if (grab_all) {
 176         gdk_display_keyboard_ungrab(gdk_display_get_default(),
 177                                     GDK_CURRENT_TIME);
 178         gdk_display_pointer_ungrab(gdk_display_get_default(), GDK_CURRENT_TIME);
 179 #ifdef GDK_WINDOWING_X11
 180         gdk_x11_display_ungrab(gdk_display_get_default());
 181 #endif /* GDK_WINDOWING_X11 */
 182         gdk_flush();
 183     }
 184
 185     manage_window_focus_out(window, NULL, NULL);
 186
 187     if (pass_ack) {
 188         const gchar *entry_text;
 189         entry_text = gtk_entry_get_text(GTK_ENTRY(pass_entry));
 190         if (entry_text) /* Hmmm: Do we really need this? */
 191             the_passphrase = g_strdup (entry_text);
 192     }
 193     gtk_widget_destroy (window);
 194
 195     return the_passphrase;
 196 }
 197
 198
 199 static void
 200 passphrase_ok_cb(GtkWidget *widget, gpointer data)
 201 {
 202     pass_ack = TRUE;
 203     gtk_main_quit();
 204 }
 205
 206 static void
 207 passphrase_cancel_cb(GtkWidget *widget, gpointer data)
 208 {
 209     pass_ack = FALSE;
 210     gtk_main_quit();
 211 }
 212
 213
 214 static gint
 215 passphrase_deleted(GtkWidget *widget, GdkEventAny *event, gpointer data)
 216 {
 217     passphrase_cancel_cb(NULL, NULL);
 218     return TRUE;
 219 }
 220
 221
 222 static gboolean
 223 passphrase_key_pressed(GtkWidget *widget, GdkEventKey *event, gpointer data)
 224 {
 225     if (event && event->keyval == GDK_Escape)
 226         passphrase_cancel_cb(NULL, NULL);
 227     return FALSE;
 228 }
 229
 230 static gint
 231 linelen (const gchar *s)
 232 {
 233     gint i;
 234
 235     for (i = 0; *s && *s != '\n'; s++, i++)
 236         ;
 237
 238     return i;
 239 }
 240
 241 static GtkWidget *
 242 create_description(const gchar *uid_hint, const gchar *pass_hint, gint prev_bad)
 243 {
 244     const gchar *uid = NULL, *info = NULL;
 245     gchar *buf;
 246     GtkWidget *label;
 247
 248     if (!uid_hint)
 249         uid = _("[no user id]");
 250     else
 251         uid = uid_hint;
 252     if (!pass_hint)
 253         info = "";
 254     else
 255         info = pass_hint;
 256
 257     buf = g_strdup_printf (_("%sPlease enter the passphrase for:\n\n"
 258                            "  %.*s  \n"
 259                            "(%.*s)\n"),
 260                            prev_bad ?
 261                            _("Bad passphrase! Try again...\n\n") : "",
 262                            linelen (uid), uid, linelen (info), info);
 263
 264     label = gtk_label_new (buf);
 265     gtk_label_set_justify (GTK_LABEL (label), GTK_JUSTIFY_LEFT);
 266     g_free (buf);
 267
 268     return label;
 269 }
 270
 271 static int free_passphrase(gpointer _unused)
 272 {
 273     if (last_pass != NULL) {
 274         munlock(last_pass, strlen(last_pass));
 275         g_free(last_pass);
 276         last_pass = NULL;
 277         debug_print("%% passphrase removed");
 278     }
 279
 280     return FALSE;
 281 }
 282
 283 gpgme_error_t
 284 gpgmegtk_passphrase_cb(void *opaque, const char *uid_hint,
 285         const char *passphrase_hint, int prev_bad, int fd)
 286 {
 287     const char *pass;
 288
 289     if (prefs_gpg_get_config()->store_passphrase && last_pass != NULL && !prev_bad) {
 290         write(fd, last_pass, strlen(last_pass));
 291         write(fd, "\n", 1);
 292         return GPG_ERR_NO_ERROR;
 293     }
 294     gpgmegtk_set_passphrase_grab (prefs_gpg_get_config()->passphrase_grab);
 295     debug_print ("%% requesting passphrase for `%s': ", uid_hint);
 296     pass = passphrase_mbox (uid_hint, passphrase_hint, prev_bad);
 297     gpgmegtk_free_passphrase();
 298     if (!pass) {
 299         debug_print ("%% cancel passphrase entry");
 300         write(fd, "\n", 1);
 301         return GPG_ERR_CANCELED;
 302     }
 303     else {
 304         if (prefs_gpg_get_config()->store_passphrase) {
 305             last_pass = g_strdup(pass);
 306             if (mlock(last_pass, strlen(last_pass)) == -1)
 307                 debug_print("%% locking passphrase failed");
 308
 309             if (prefs_gpg_get_config()->store_passphrase_timeout > 0) {
 310                 gtk_timeout_add(prefs_gpg_get_config()->store_passphrase_timeout*60*1000,
 311                                 free_passphrase, NULL);
 312             }
 313         }
 314         debug_print ("%% sending passphrase");
 315     }
 316     write(fd, pass, strlen(pass));
 317     write(fd, "\n", 1);
 318     return GPG_ERR_NO_ERROR;
 319 }
 320
 321 void gpgmegtk_free_passphrase()
 322 {
 323     (void)free_passphrase(NULL); // could be inline
 324 }
 325
 326 #endif /* USE_GPGME */