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/*
* Copyright (C) 2021 Red Hat, Inc.
*
* Author: Alexander Sosedkin
*
* This file is part of GnuTLS.
*
* GnuTLS 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 3 of the License, or
* (at your option) any later version.
*
* GnuTLS 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 GnuTLS; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/*
* This test isn't meant for direct execution.
* It is the significant part of the test
* invoked from system-override-curves-allowlist.sh that covers:
* - generating a key using the curve enabled in the config succeeds
* - disabling the previously enabled curve results in blocking it
* - reenabling it back is also possible after disabling
* - enabling a different curve unblocks key generation using it
* - disabling the originally enabled curve results in blocking it
* - redisabling it back is also possible after enabling
* Inputs (passed through environment variables):
* - INITIALLY_ENABLED_CURVES - space-separated string
* - INITIALLY_DISABLED_CURVES - space-separated string
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <gnutls/gnutls.h>
#include <gnutls/abstract.h>
#include "utils.h"
#define _assert(cond, format, ...) if (!(cond)) \
_fail("Assertion `" #cond "` failed: " format "\n", ##__VA_ARGS__)
#define _check(cond) if (!(cond)) _fail("Assertion `" #cond "` failed.\n")
gnutls_ecc_curve_t unlocked_ecc_curve_get_id(const char* curve);
gnutls_pk_algorithm_t curve_name_to_pk(const char* curve);
void assert_unblocked(const char* curve);
void assert_blocked(const char* curve);
char* envvarcpy(const char* envvar);
gnutls_ecc_curve_t unlocked_ecc_curve_get_id(const char* curve) {
if (!strcasecmp(curve, "SECP192R1")) return GNUTLS_ECC_CURVE_SECP192R1;
if (!strcasecmp(curve, "SECP256R1")) return GNUTLS_ECC_CURVE_SECP256R1;
if (!strcasecmp(curve, "SECP384R1")) return GNUTLS_ECC_CURVE_SECP384R1;
if (!strcasecmp(curve, "SECP521R1")) return GNUTLS_ECC_CURVE_SECP521R1;
if (!strcasecmp(curve, "X448")) return GNUTLS_ECC_CURVE_X448;
if (!strcasecmp(curve, "X25519")) return GNUTLS_ECC_CURVE_X25519;
fprintf(stderr, "unknown curve %s\n", curve);
return GNUTLS_ECC_CURVE_INVALID;
}
gnutls_pk_algorithm_t curve_name_to_pk(const char* curve) {
if (!strcasecmp(curve, "X448")) return GNUTLS_PK_ECDH_X448;
if (!strcasecmp(curve, "X25519")) return GNUTLS_PK_ECDH_X25519;
return GNUTLS_PK_ECDSA;
}
void assert_unblocked(const char* curve_name) {
gnutls_privkey_t priv;
gnutls_ecc_curve_t curve;
gnutls_pk_algorithm_t pk;
unsigned int bits;
fprintf(stderr, "generating a key using non-blocked %s curve...\n",
curve_name);
_check(curve = gnutls_ecc_curve_get_id(curve_name));
_check(curve == unlocked_ecc_curve_get_id(curve_name));
_check(gnutls_privkey_init(&priv) == GNUTLS_E_SUCCESS);
bits = GNUTLS_CURVE_TO_BITS(curve);
pk = curve_name_to_pk(curve_name);
_check(gnutls_privkey_generate(priv, pk, bits, 0) == GNUTLS_E_SUCCESS);
gnutls_privkey_deinit(priv);
fprintf(stderr, "%s succeeds as expected\n", curve_name);
}
void assert_blocked(const char* curve_name) {
gnutls_privkey_t priv;
gnutls_ecc_curve_t curve;
unsigned int bits;
gnutls_pk_algorithm_t pk;
fprintf(stderr, "generating a key using blocked %s curve...\n",
curve_name);
_check(gnutls_ecc_curve_get_id(curve_name) == GNUTLS_ECC_CURVE_INVALID);
_check((curve = unlocked_ecc_curve_get_id(curve_name)) !=
GNUTLS_ECC_CURVE_INVALID);
_check(!strcasecmp(curve_name, gnutls_ecc_curve_get_name(curve)));
_check(gnutls_privkey_init(&priv) == GNUTLS_E_SUCCESS);
bits = GNUTLS_CURVE_TO_BITS(curve);
pk = curve_name_to_pk(curve_name);
_check(gnutls_privkey_generate(priv, pk, bits, 0) < 0);
gnutls_privkey_deinit(priv);
fprintf(stderr, "%s is blocked as expected\n", curve_name);
}
char* envvarcpy(const char* envvar) {
char* s;
_assert(s = getenv(envvar), "variable %s is not set", envvar);
return gnutls_strdup(s);
}
void doit(void) {
char* curves;
const char* curve;
gnutls_ecc_curve_t curve_id;
curves = envvarcpy("INITIALLY_ENABLED_CURVES");
for (curve = strtok(curves, " "); curve; curve = strtok(NULL, " ")) {
curve_id = unlocked_ecc_curve_get_id(curve);
assert_unblocked(curve);
gnutls_ecc_curve_set_enabled(curve_id, 0);
assert_blocked(curve);
gnutls_ecc_curve_set_enabled(curve_id, 1);
assert_unblocked(curve);
printf("disableable: %s\n", curve);
}
free(curves);
curves = envvarcpy("INITIALLY_DISABLED_CURVES");
for (curve = strtok(curves, " "); curve; curve = strtok(NULL, " ")) {
curve_id = unlocked_ecc_curve_get_id(curve);
assert_blocked(curve);
gnutls_ecc_curve_set_enabled(curve_id, 1);
assert_unblocked(curve);
gnutls_ecc_curve_set_enabled(curve_id, 0);
assert_blocked(curve);
printf("reenableable: %s\n", curve);
}
free(curves);
exit(0);
}
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