remmina_unlock.c

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/*
 * Remmina - The GTK+ Remote Desktop Client
 * Copyright (C) 2016-2023 Antenore Gatta, Giovanni Panozzo
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 *
 *  In addition, as a special exception, the copyright holders give
 *  permission to link the code of portions of this program with the
 *  OpenSSL library under certain conditions as described in each
 *  individual source file, and distribute linked combinations
 *  including the two.
 *  You must obey the GNU General Public License in all respects
 *  for all of the code used other than OpenSSL. *  If you modify
 *  file(s) with this exception, you may extend this exception to your
 *  version of the file(s), but you are not obligated to do so. *  If you
 *  do not wish to do so, delete this exception statement from your
 *  version. *  If you delete this exception statement from all source
 *  files in the program, then also delete it here.
 *
 */

#include <stdlib.h>

#include <glib/gi18n.h>
#include <glib.h>
#include <glib/gprintf.h>

#include "config.h"
#include "remmina_sodium.h"
#include "remmina_pref.h"
#include "remmina_log.h"
#include "remmina_unlock.h"
#include "remmina_passwd.h"
#include "remmina_public.h"
#include "remmina/remmina_trace_calls.h"

#if SODIUM_VERSION_INT >= 90200
static RemminaUnlockDialog *remmina_unlock_dialog;
#define GET_OBJ(object_name) gtk_builder_get_object(remmina_unlock_dialog->builder, object_name)

GTimer *timer;
gboolean unlocked;

static void remmina_unlock_timer_init()
{
    TRACE_CALL(__func__);

    timer = g_timer_new();
    REMMINA_DEBUG("Validity timer for Remmina password started");
}

static void remmina_unlock_timer_reset(gpointer user_data)
{
    TRACE_CALL(__func__);

    g_timer_reset(timer);
    REMMINA_DEBUG("Validity timer for Remmina password reset");
}

void remmina_unlock_timer_destroy()
{
    TRACE_CALL(__func__);

    g_timer_destroy(timer);
    timer = NULL;
}

static void remmina_unlock_unlock_clicked(GtkButton *btn, gpointer user_data)
{
    TRACE_CALL(__func__);
    //g_timer_reset(NULL);

    gchar *unlock_password;
    const gchar *entry_passwd;
    gint rc;

    unlock_password = remmina_pref_get_value("unlock_password");
    entry_passwd = gtk_entry_get_text(remmina_unlock_dialog->entry_unlock);
    rc = remmina_sodium_pwhash_str_verify(unlock_password, entry_passwd);
    //REMMINA_DEBUG("remmina_sodium_pwhash_str_verify returned %i", rc);

    if (rc == 0) {
        REMMINA_DEBUG("Password verified");
        //unlocked = FALSE;
        remmina_unlock_dialog->retval = TRUE;
    } else {
        REMMINA_WARNING ("The password is wrong. Reset it by editing the remmina.pref file by hand");
        remmina_unlock_timer_reset(NULL);
        remmina_unlock_dialog->retval = FALSE;
    }
    gtk_dialog_response(remmina_unlock_dialog->dialog, GTK_RESPONSE_ACCEPT);
}

static void remmina_unlock_cancel_clicked(GtkButton *btn, gpointer user_data)
{
    TRACE_CALL(__func__);
    gtk_dialog_response(remmina_unlock_dialog->dialog, GTK_RESPONSE_CANCEL);
}

gint remmina_unlock_new(GtkWindow *parent)
{
    TRACE_CALL(__func__);

    gdouble unlock_timeout;
    gdouble elapsed = 0.0;
    gboolean lock = FALSE;
    gboolean rc;

    /* We don't have a timer, so this is the first time
     * or the timer has been destroyed
     */
    if (timer == NULL) {
        remmina_unlock_timer_init();
        unlocked = FALSE;
    }

    /* We have a timer, we get the elapsed time since its start */
    if (timer != NULL)
        elapsed = g_timer_elapsed(timer, NULL);

    /* We stop the timer while we enter the password) */
    if (timer) g_timer_stop(timer);

    unlock_timeout = remmina_pref.unlock_timeout;
    REMMINA_DEBUG ("unlock_timeout = %f", unlock_timeout);
    REMMINA_DEBUG ("elapsed = %f", elapsed);
    REMMINA_DEBUG ("INT unlock_timeout = %d", (int)unlock_timeout);
    REMMINA_DEBUG ("INT elapsed = %d", (int)elapsed);
    /* always LOCK and ask password */
    if ((elapsed) && ((int)unlock_timeout - elapsed) <= 0) {
        unlocked = FALSE;
        remmina_unlock_timer_reset(NULL);
    }
    /* We don't lock as it has been already requested */
    //if (!unlocked && ((int)unlock_timeout - elapsed) > 0) unlocked = TRUE;

    REMMINA_DEBUG("Based on settings and current status, the unlocking dialog is set to %d", unlocked);

    if (unlocked) {
        REMMINA_DEBUG ("No need to request a password");
        rc = TRUE;
        return rc;
    } else {

        remmina_unlock_dialog = g_new0(RemminaUnlockDialog, 1);
        remmina_unlock_dialog->retval = FALSE;

        remmina_unlock_dialog->builder = remmina_public_gtk_builder_new_from_resource("/org/remmina/Remmina/src/../data/ui/remmina_unlock.glade");
        remmina_unlock_dialog->dialog = GTK_DIALOG(gtk_builder_get_object(remmina_unlock_dialog->builder, "RemminaUnlockDialog"));
        if (parent)
            gtk_window_set_transient_for(GTK_WINDOW(remmina_unlock_dialog->dialog), parent);

        remmina_unlock_dialog->entry_unlock = GTK_ENTRY(GET_OBJ("entry_unlock"));
        gtk_entry_set_activates_default(GTK_ENTRY(remmina_unlock_dialog->entry_unlock), TRUE);
        remmina_unlock_dialog->button_unlock = GTK_BUTTON(GET_OBJ("button_unlock"));
        gtk_widget_set_can_default(GTK_WIDGET(remmina_unlock_dialog->button_unlock), TRUE);
        gtk_widget_grab_default(GTK_WIDGET(remmina_unlock_dialog->button_unlock));
        remmina_unlock_dialog->button_unlock_cancel = GTK_BUTTON(GET_OBJ("button_unlock_cancel"));

        g_signal_connect(remmina_unlock_dialog->button_unlock, "clicked",
                 G_CALLBACK(remmina_unlock_unlock_clicked), (gpointer)remmina_unlock_dialog);
        g_signal_connect(remmina_unlock_dialog->button_unlock_cancel, "clicked",
                 G_CALLBACK(remmina_unlock_cancel_clicked), (gpointer)remmina_unlock_dialog);
        g_signal_connect (remmina_unlock_dialog->dialog, "close",
              G_CALLBACK (remmina_unlock_cancel_clicked), (gpointer)remmina_unlock_dialog);

        /* Connect signals */
        gtk_builder_connect_signals(remmina_unlock_dialog->builder, NULL);

         g_object_set_data_full (G_OBJECT(remmina_unlock_dialog->dialog), "builder", remmina_unlock_dialog->builder, g_object_unref);

        gchar *unlock_password = NULL;
        unlock_password = g_strdup(remmina_pref_get_value("unlock_password"));
        //REMMINA_DEBUG ("Password from preferences is: %s", unlock_password);
        if ((unlock_password == NULL) || (g_strcmp0(unlock_password, "") == 0)) {
            if (remmina_passwd (GTK_WINDOW(remmina_unlock_dialog->dialog), &unlock_password)) {
                //REMMINA_DEBUG ("Password is: %s", unlock_password);
                remmina_pref_set_value("unlock_password", g_strdup(unlock_password));
                remmina_unlock_dialog->retval = TRUE;
            } else {
                remmina_unlock_dialog->retval = FALSE;
            }
        }

        int result = GTK_RESPONSE_NONE;
        if (g_strcmp0(unlock_password, "") != 0) {
            result = gtk_dialog_run (GTK_DIALOG (remmina_unlock_dialog->dialog));
        } else
            remmina_unlock_dialog->retval = lock;

        switch (result)
        {
            case GTK_RESPONSE_ACCEPT:
                if (!remmina_unlock_dialog->retval)
                    REMMINA_DEBUG ("Wrong password");
                else {
                    REMMINA_DEBUG ("Correct password. Unlocking…");
                    unlocked = TRUE;
                }
                REMMINA_DEBUG ("retval: %d", remmina_unlock_dialog->retval);
                break;
            default:
                //unlocked = FALSE;
                remmina_unlock_dialog->retval = FALSE;
                remmina_unlock_timer_destroy ();
                REMMINA_DEBUG ("Password not requested. Return value: %d", remmina_unlock_dialog->retval);
                break;
        }

        rc = remmina_unlock_dialog->retval;

        g_free(unlock_password), unlock_password = NULL;
        gtk_widget_destroy(GTK_WIDGET(remmina_unlock_dialog->dialog));
        remmina_unlock_dialog->dialog = NULL;
    }
    if (timer) g_timer_start(timer);
    return(rc);
}

#else
gint remmina_unlock_new(GtkWindow *parent)
{
    return 1;
}
#endif