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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.
*
*/
/**
* @file remmina_sodium.c
* @brief Remmina encryption functions,
* @author Antenore Gatta
* @date 31 Mar 2019
*
* These functions are used to:
* - hash password using the Argon2 hashing algorithm.
* - Encrypt and decrypt data streams (files for examples).
*
* @code
*
* gchar *test = remmina_sodium_pwhash("Password test");
* g_free(test);
* test = remmina_sodium_pwhash_str("Password Test");
* g_free(test);
* gint rc = remmina_sodium_pwhash_str_verify("$argon2id$v=19$m=65536,t=2,p=1$6o+kpazlHSaevezH2J9qUA$4pN75oHgyh1BLc/b+ybLYHjZbatG4ZSCSlxLI32YPY4", "Password Test");
*
* @endcode
*
*/
#include <string.h>
#if defined(__linux__)
# include <fcntl.h>
# include <unistd.h>
# include <sys/ioctl.h>
# include <linux/random.h>
#endif
#include "config.h"
#include <glib.h>
#include "remmina_pref.h"
#include "remmina/remmina_trace_calls.h"
#include "remmina_sodium.h"
#if SODIUM_VERSION_INT >= 90200
gchar *remmina_sodium_pwhash(const gchar *pass)
{
TRACE_CALL(__func__);
g_info("Generating passphrase (may take a while)...");
/* Create a random salt for the key derivation function */
unsigned char salt[crypto_pwhash_SALTBYTES] = { 0 };
randombytes_buf(salt, sizeof salt);
unsigned long long opslimit;
size_t memlimit;
switch (remmina_pref.enc_mode) {
case RM_ENC_MODE_SODIUM_MODERATE:
opslimit = crypto_pwhash_OPSLIMIT_MODERATE;
memlimit = crypto_pwhash_MEMLIMIT_MODERATE;
break;
case RM_ENC_MODE_SODIUM_SENSITIVE:
opslimit = crypto_pwhash_OPSLIMIT_SENSITIVE;
memlimit = crypto_pwhash_MEMLIMIT_SENSITIVE;
break;
case RM_ENC_MODE_GCRYPT:
case RM_ENC_MODE_SECRET:
case RM_ENC_MODE_SODIUM_INTERACTIVE:
default:
opslimit = crypto_pwhash_OPSLIMIT_INTERACTIVE;
memlimit = crypto_pwhash_MEMLIMIT_INTERACTIVE;
break;
}
/* Use argon2 to convert password to a full size key */
unsigned char key[crypto_secretbox_KEYBYTES];
if (crypto_pwhash(key, sizeof key, pass, strlen(pass), salt,
opslimit,
memlimit,
crypto_pwhash_ALG_DEFAULT) != 0) {
g_error("%s - Out of memory!", __func__);
exit(1);
}
g_info("%s - Password hashed", __func__);
return g_strdup((const char *)key);
}
gchar *remmina_sodium_pwhash_str(const gchar *pass)
{
TRACE_CALL(__func__);
g_info("Generating passphrase (may take a while)...");
/* Create a random salt for the key derivation function */
unsigned char salt[crypto_pwhash_SALTBYTES] = { 0 };
randombytes_buf(salt, sizeof salt);
unsigned long long opslimit;
size_t memlimit;
switch (remmina_pref.enc_mode) {
case RM_ENC_MODE_SODIUM_MODERATE:
opslimit = crypto_pwhash_OPSLIMIT_MODERATE;
memlimit = crypto_pwhash_MEMLIMIT_MODERATE;
break;
case RM_ENC_MODE_SODIUM_SENSITIVE:
opslimit = crypto_pwhash_OPSLIMIT_SENSITIVE;
memlimit = crypto_pwhash_MEMLIMIT_SENSITIVE;
break;
case RM_ENC_MODE_GCRYPT:
case RM_ENC_MODE_SECRET:
case RM_ENC_MODE_SODIUM_INTERACTIVE:
default:
opslimit = crypto_pwhash_OPSLIMIT_INTERACTIVE;
memlimit = crypto_pwhash_MEMLIMIT_INTERACTIVE;
break;
}
/* Use argon2 to convert password to a full size key */
char key[crypto_pwhash_STRBYTES];
if (crypto_pwhash_str(key, pass, strlen(pass),
opslimit,
memlimit) != 0) {
g_error("%s - Out of memory!", __func__);
exit(1);
}
g_info("%s - Password hashed", __func__);
return g_strdup((const char *)key);
}
gint remmina_sodium_pwhash_str_verify(const char *key, const char *pass)
{
TRACE_CALL(__func__);
gint rc;
rc = crypto_pwhash_str_verify(key, pass, strlen(pass));
return rc;
}
void remmina_sodium_init(void)
{
TRACE_CALL(__func__);
#if defined(__linux__) && defined(RNDGETENTCNT)
int fd;
int c;
if ((fd = open("/dev/random", O_RDONLY)) != -1) {
if (ioctl(fd, RNDGETENTCNT, &c) == 0 && c < 160) {
g_printerr("This system doesn't provide enough entropy to quickly generate high-quality random numbers.\n"
"Installing the rng-utils/rng-tools, jitterentropy or haveged packages may help.\n"
"On virtualized Linux environments, also consider using virtio-rng.\n"
"The service will not start until enough entropy has been collected.\n");
}
(void)close(fd);
}
#endif
if (sodium_init() < 0)
g_critical("%s - Failed to initialize sodium, it is not safe to use", __func__);
}
#endif
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