/src/gnutls/lib/fips.h

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/*
 * Copyright (C) 2013 Red Hat
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * The GnuTLS is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>
 *
 */

#ifndef GNUTLS_LIB_FIPS_H
#define GNUTLS_LIB_FIPS_H

#include "gnutls_int.h"
#include <gnutls/gnutls.h>

#define FIPS140_RND_KEY_SIZE 32

typedef enum {
  LIB_STATE_POWERON,
  LIB_STATE_INIT,
  LIB_STATE_SELFTEST,
  LIB_STATE_OPERATIONAL,
  LIB_STATE_ERROR,
  LIB_STATE_SHUTDOWN
} gnutls_lib_state_t;

/* do not access directly */
extern unsigned int _gnutls_lib_state;
extern gnutls_crypto_rnd_st _gnutls_fips_rnd_ops;

void _gnutls_switch_fips_state(gnutls_fips140_operation_state_t state);

inline static void _gnutls_switch_lib_state(gnutls_lib_state_t state)
{
  /* Once into zombie state no errors can change us */
  _gnutls_lib_state = state;
}

inline static gnutls_lib_state_t _gnutls_get_lib_state(void)
{
  return _gnutls_lib_state;
}

int _gnutls_fips_perform_self_checks1(void);
int _gnutls_fips_perform_self_checks2(void);
void _gnutls_fips_mode_reset_zombie(void);

#ifdef ENABLE_FIPS140
unsigned _gnutls_fips_mode_enabled(void);
#else
#define _gnutls_fips_mode_enabled() 0
#endif

#define HAVE_LIB_ERROR()                                             \
  unlikely(_gnutls_get_lib_state() != LIB_STATE_OPERATIONAL && \
     _gnutls_get_lib_state() != LIB_STATE_SELFTEST)

#define FAIL_IF_LIB_ERROR     \
  if (HAVE_LIB_ERROR()) \
  return GNUTLS_E_LIB_IN_ERROR_STATE

void _gnutls_switch_lib_state(gnutls_lib_state_t state);

void _gnutls_lib_simulate_error(void);
void _gnutls_lib_force_operational(void);

inline static bool
is_mac_algo_hmac_approved_in_fips(gnutls_mac_algorithm_t algo)
{
  switch (algo) {
  case GNUTLS_MAC_SHA1:
  case GNUTLS_MAC_SHA256:
  case GNUTLS_MAC_SHA384:
  case GNUTLS_MAC_SHA512:
  case GNUTLS_MAC_SHA224:
  case GNUTLS_MAC_SHA3_224:
  case GNUTLS_MAC_SHA3_256:
  case GNUTLS_MAC_SHA3_384:
  case GNUTLS_MAC_SHA3_512:
    return true;
  default:
    return false;
  }
}

inline static bool is_mac_algo_approved_in_fips(gnutls_mac_algorithm_t algo)
{
  if (is_mac_algo_hmac_approved_in_fips(algo)) {
    return true;
  }

  switch (algo) {
  case GNUTLS_MAC_AES_CMAC_128:
  case GNUTLS_MAC_AES_CMAC_256:
  case GNUTLS_MAC_AES_GMAC_128:
  case GNUTLS_MAC_AES_GMAC_192:
  case GNUTLS_MAC_AES_GMAC_256:
    return true;
  default:
    return false;
  }
}

inline static bool is_mac_algo_allowed_in_fips(gnutls_mac_algorithm_t algo)
{
  return is_mac_algo_approved_in_fips(algo);
}

inline static bool
is_cipher_algo_approved_in_fips(gnutls_cipher_algorithm_t algo)
{
  switch (algo) {
  case GNUTLS_CIPHER_AES_128_CBC:
  case GNUTLS_CIPHER_AES_256_CBC:
  case GNUTLS_CIPHER_AES_192_CBC:
  case GNUTLS_CIPHER_AES_128_CCM:
  case GNUTLS_CIPHER_AES_256_CCM:
  case GNUTLS_CIPHER_AES_128_CCM_8:
  case GNUTLS_CIPHER_AES_256_CCM_8:
  case GNUTLS_CIPHER_AES_128_CFB8:
  case GNUTLS_CIPHER_AES_192_CFB8:
  case GNUTLS_CIPHER_AES_256_CFB8:
  case GNUTLS_CIPHER_AES_128_XTS:
  case GNUTLS_CIPHER_AES_256_XTS:
    return true;
  default:
    return false;
  }
}

inline static bool
is_cipher_algo_allowed_in_fips(gnutls_cipher_algorithm_t algo)
{
  if (is_cipher_algo_approved_in_fips(algo)) {
    return true;
  }

  /* GCM is only approved in TLS */
  switch (algo) {
  case GNUTLS_CIPHER_AES_128_GCM:
  case GNUTLS_CIPHER_AES_192_GCM:
  case GNUTLS_CIPHER_AES_256_GCM:
    return true;
  default:
    return false;
  }
}

#ifdef ENABLE_FIPS140
/* This will test the condition when in FIPS140-2 mode
 * and return an error if necessary or ignore */
#define FIPS_RULE(condition, ret_error, ...)                                            \
  {                                                                               \
    gnutls_fips_mode_t _mode = _gnutls_fips_mode_enabled();                 \
    if (_mode != GNUTLS_FIPS140_DISABLED) {                                 \
      if (condition) {                                                \
        if (_mode == GNUTLS_FIPS140_LOG) {                      \
          _gnutls_audit_log(                              \
            NULL,                                   \
            "fips140-2: allowing " __VA_ARGS__);    \
        } else if (_mode != GNUTLS_FIPS140_LAX) {               \
          _gnutls_debug_log(                              \
            "fips140-2: disallowing " __VA_ARGS__); \
          return ret_error;                               \
        }                                                       \
      }                                                               \
    }                                                                       \
  }

inline static bool is_mac_algo_allowed(gnutls_mac_algorithm_t algo)
{
  gnutls_fips_mode_t mode = _gnutls_fips_mode_enabled();
  if (_gnutls_get_lib_state() != LIB_STATE_SELFTEST &&
      !is_mac_algo_allowed_in_fips(algo)) {
    switch (mode) {
    case GNUTLS_FIPS140_LOG:
      _gnutls_audit_log(NULL,
            "fips140-2: allowing access to %s\n",
            gnutls_mac_get_name(algo));
      FALLTHROUGH;
    case GNUTLS_FIPS140_DISABLED:
    case GNUTLS_FIPS140_LAX:
      return true;
    default:
      return false;
    }
  }

  return true;
}

inline static bool is_cipher_algo_allowed(gnutls_cipher_algorithm_t algo)
{
  gnutls_fips_mode_t mode = _gnutls_fips_mode_enabled();
  if (_gnutls_get_lib_state() != LIB_STATE_SELFTEST &&
      !is_cipher_algo_allowed_in_fips(algo)) {
    switch (mode) {
    case GNUTLS_FIPS140_LOG:
      _gnutls_audit_log(NULL,
            "fips140-2: allowing access to %s\n",
            gnutls_cipher_get_name(algo));
      FALLTHROUGH;
    case GNUTLS_FIPS140_DISABLED:
    case GNUTLS_FIPS140_LAX:
      return true;
    default:
      return false;
    }
  }

  return true;
}
#else
#define is_mac_algo_allowed(x) true
#define is_cipher_algo_allowed(x) true
#define FIPS_RULE(condition, ret_error, ...)
#endif

#endif /* GNUTLS_LIB_FIPS_H */

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Created: 2024-06-20 06:28