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/*
* Remmina - The GTK+ Remote Desktop Client
* Copyright (C) 2009 - Vic Lee
* Copyright (C) 2014-2015 Antenore Gatta, Fabio Castelli, Giovanni Panozzo
* 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 "config.h"
#ifdef HAVE_LIBGCRYPT
#include <gcrypt.h>
#endif
#include "remmina_pref.h"
#include "remmina_crypt.h"
#include "remmina/remmina_trace_calls.h"
#ifdef HAVE_LIBGCRYPT
static gboolean remmina_crypt_init(gcry_cipher_hd_t *phd)
{
TRACE_CALL(__func__);
guchar* secret;
gcry_error_t err;
gsize secret_len;
secret = g_base64_decode(remmina_pref.secret, &secret_len);
if (secret_len < 32) {
g_debug("secret corrupted\n");
g_free(secret);
return FALSE;
}
err = gcry_cipher_open(phd, GCRY_CIPHER_3DES, GCRY_CIPHER_MODE_CBC, 0);
if (err) {
g_debug("gcry_cipher_open failure: %s\n", gcry_strerror(err));
g_free(secret);
return FALSE;
}
err = gcry_cipher_setkey((*phd), secret, 24);
if (err) {
g_debug("gcry_cipher_setkey failure: %s\n", gcry_strerror(err));
g_free(secret);
gcry_cipher_close((*phd));
return FALSE;
}
err = gcry_cipher_setiv((*phd), secret + 24, 8);
if (err) {
g_debug("gcry_cipher_setiv failure: %s\n", gcry_strerror(err));
g_free(secret);
gcry_cipher_close((*phd));
return FALSE;
}
g_free(secret);
return TRUE;
}
gchar* remmina_crypt_encrypt(const gchar *str)
{
TRACE_CALL(__func__);
guchar* buf;
gint buf_len;
gchar* result;
gcry_error_t err;
gcry_cipher_hd_t hd;
if (!str || str[0] == '\0')
return NULL;
if (!remmina_crypt_init(&hd))
return NULL;
buf_len = strlen(str);
/* Pack to 64bit block size, and make sure it’s always 0-terminated */
buf_len += 8 - buf_len % 8;
buf = (guchar*)g_malloc(buf_len);
memset(buf, 0, buf_len);
memcpy(buf, str, strlen(str));
err = gcry_cipher_encrypt(hd, buf, buf_len, NULL, 0);
if (err) {
g_debug("gcry_cipher_encrypt failure: %s/%s\n",
gcry_strsource(err),
gcry_strerror(err));
g_free(buf);
gcry_cipher_close(hd);
return NULL;
}
result = g_base64_encode(buf, buf_len);
g_free(buf);
gcry_cipher_close(hd);
return result;
}
gchar* remmina_crypt_decrypt(const gchar *str)
{
TRACE_CALL(__func__);
guchar* buf;
gsize buf_len;
gcry_error_t err;
gcry_cipher_hd_t hd;
if (!str || str[0] == '\0')
return NULL;
if (!remmina_crypt_init(&hd))
return NULL;
buf = g_base64_decode(str, &buf_len);
#if 0
g_debug ("%s base64 encoded as %p with length %lu",
str,
&buf,
buf_len);
#endif
err = gcry_cipher_decrypt(
hd, // gcry_cipher_hd_t
buf, // guchar
buf_len, // gsize
NULL, // NULL and 0 -> in place decrypt
0);
if (err) {
g_debug("gcry_cipher_decrypt failure: %s/%s\n",
gcry_strsource(err),
gcry_strerror(err));
g_free(buf);
gcry_cipher_close(hd);
//return NULL;
return g_strdup(str);
}
gcry_cipher_close(hd);
/* Just in case */
if (buf_len > 0)
buf[buf_len - 1] = '\0';
return (gchar*)buf;
}
#else
gchar* remmina_crypt_encrypt(const gchar *str)
{
TRACE_CALL(__func__);
return NULL;
}
gchar* remmina_crypt_decrypt(const gchar *str)
{
TRACE_CALL(__func__);
return NULL;
}
#endif
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