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 */