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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2019-2021 Arne Schwabe <arne@rfc2549.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#include "syshead.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <setjmp.h>
#include <cmocka.h>
#include "ssl_ncp.c"
/* Defines for use in the tests and the mock parse_line() */
const char *bf_chacha = "BF-CBC:CHACHA20-POLY1305";
const char *aes_ciphers = "AES-256-GCM:AES-128-GCM";
static void
test_check_ncp_ciphers_list(void **state)
{
struct gc_arena gc = gc_new();
bool have_chacha = cipher_kt_get("CHACHA20-POLY1305");
bool have_blowfish = cipher_kt_get("BF-CBC");
assert_string_equal(mutate_ncp_cipher_list("none", &gc), "none");
assert_string_equal(mutate_ncp_cipher_list("AES-256-GCM:none", &gc),
"AES-256-GCM:none");
assert_string_equal(mutate_ncp_cipher_list(aes_ciphers, &gc), aes_ciphers);
if (have_chacha && have_blowfish)
{
assert_string_equal(mutate_ncp_cipher_list(bf_chacha, &gc), bf_chacha);
assert_string_equal(mutate_ncp_cipher_list("BF-CBC:CHACHA20-POLY1305", &gc),
bf_chacha);
}
else
{
assert_ptr_equal(mutate_ncp_cipher_list(bf_chacha, &gc), NULL);
}
/* For testing that with OpenSSL 1.1.0+ that also accepts ciphers in
* a different spelling the normalised cipher output is the same */
bool have_chacha_mixed_case = cipher_kt_get("ChaCha20-Poly1305");
if (have_chacha_mixed_case)
{
assert_string_equal(mutate_ncp_cipher_list("BF-CBC:ChaCha20-Poly1305", &gc),
bf_chacha);
}
assert_ptr_equal(mutate_ncp_cipher_list("vollbit", &gc), NULL);
assert_ptr_equal(mutate_ncp_cipher_list("AES-256-GCM:vollbit", &gc), NULL);
assert_ptr_equal(mutate_ncp_cipher_list("", &gc), NULL);
assert_ptr_equal(mutate_ncp_cipher_list(
"ChaCha20-Poly1305:ChaCha20-Poly1305:ChaCha20-Poly1305:"
"ChaCha20-Poly1305:ChaCha20-Poly1305:ChaCha20-Poly1305:"
"ChaCha20-Poly1305", &gc), NULL);
#ifdef ENABLE_CRYPTO_OPENSSL
assert_string_equal(mutate_ncp_cipher_list("id-aes128-GCM:id-aes256-GCM",
&gc), "AES-128-GCM:AES-256-GCM");
#else
if (have_blowfish)
{
assert_string_equal(mutate_ncp_cipher_list("BLOWFISH-CBC",
&gc), "BF-CBC");
}
#endif
gc_free(&gc);
}
static void
test_extract_client_ciphers(void **state)
{
struct gc_arena gc = gc_new();
const char *client_peer_info;
const char *peer_list;
client_peer_info = "foo=bar\nIV_foo=y\nIV_NCP=2";
peer_list = tls_peer_ncp_list(client_peer_info, &gc);
assert_string_equal(aes_ciphers,peer_list);
assert_true(tls_peer_supports_ncp(client_peer_info));
client_peer_info = "foo=bar\nIV_foo=y\nIV_NCP=2\nIV_CIPHERS=BF-CBC";
peer_list = tls_peer_ncp_list(client_peer_info, &gc);
assert_string_equal("BF-CBC", peer_list);
assert_true(tls_peer_supports_ncp(client_peer_info));
client_peer_info = "IV_NCP=2\nIV_CIPHERS=BF-CBC:FOO-BAR\nIV_BAR=7";
peer_list = tls_peer_ncp_list(client_peer_info, &gc);
assert_string_equal("BF-CBC:FOO-BAR", peer_list);
assert_true(tls_peer_supports_ncp(client_peer_info));
client_peer_info = "IV_CIPHERS=BF-CBC:FOO-BAR\nIV_BAR=7";
peer_list = tls_peer_ncp_list(client_peer_info, &gc);
assert_string_equal("BF-CBC:FOO-BAR", peer_list);
assert_true(tls_peer_supports_ncp(client_peer_info));
client_peer_info = "IV_YOLO=NO\nIV_BAR=7";
peer_list = tls_peer_ncp_list(client_peer_info, &gc);
assert_string_equal("", peer_list);
assert_false(tls_peer_supports_ncp(client_peer_info));
peer_list = tls_peer_ncp_list(NULL, &gc);
assert_string_equal("", peer_list);
assert_false(tls_peer_supports_ncp(client_peer_info));
gc_free(&gc);
}
static void
test_poor_man(void **state)
{
struct gc_arena gc = gc_new();
char *best_cipher;
const char *serverlist = "CHACHA20_POLY1305:AES-128-GCM";
const char *serverlistbfcbc = "CHACHA20_POLY1305:AES-128-GCM:BF-CBC:none";
best_cipher = ncp_get_best_cipher(serverlist,
"IV_YOLO=NO\nIV_BAR=7",
"BF-CBC", &gc);
assert_ptr_equal(best_cipher, NULL);
best_cipher = ncp_get_best_cipher(serverlistbfcbc,
"IV_YOLO=NO\nIV_BAR=7",
"BF-CBC", &gc);
assert_string_equal(best_cipher, "BF-CBC");
best_cipher = ncp_get_best_cipher(serverlist,
"IV_NCP=1\nIV_BAR=7",
"AES-128-GCM", &gc);
assert_string_equal(best_cipher, "AES-128-GCM");
best_cipher = ncp_get_best_cipher(serverlist, NULL,
"AES-128-GCM", &gc);
assert_string_equal(best_cipher, "AES-128-GCM");
best_cipher = ncp_get_best_cipher(serverlist, NULL,
"none", &gc);
assert_ptr_equal(best_cipher, NULL);
best_cipher = ncp_get_best_cipher(serverlistbfcbc, NULL,
"none", &gc);
assert_string_equal(best_cipher, "none");
best_cipher = ncp_get_best_cipher(serverlist, NULL,NULL, &gc);
assert_ptr_equal(best_cipher, NULL);
gc_free(&gc);
}
static void
test_ncp_best(void **state)
{
struct gc_arena gc = gc_new();
char *best_cipher;
const char *serverlist = "CHACHA20_POLY1305:AES-128-GCM:AES-256-GCM";
best_cipher = ncp_get_best_cipher(serverlist,
"IV_YOLO=NO\nIV_NCP=2\nIV_BAR=7",
"BF-CBC", &gc);
assert_string_equal(best_cipher, "AES-128-GCM");
/* Best cipher is in --cipher of client */
best_cipher = ncp_get_best_cipher(serverlist, "IV_NCP=2\nIV_BAR=7",
"CHACHA20_POLY1305", &gc);
assert_string_equal(best_cipher, "CHACHA20_POLY1305");
/* Best cipher is in --cipher of client */
best_cipher = ncp_get_best_cipher(serverlist, "IV_CIPHERS=AES-128-GCM",
"AES-256-CBC", &gc);
assert_string_equal(best_cipher, "AES-128-GCM");
/* IV_NCP=2 should be ignored if IV_CIPHERS is sent */
best_cipher = ncp_get_best_cipher(serverlist,
"IV_FOO=7\nIV_CIPHERS=AES-256-GCM\nIV_NCP=2",
"AES-256-CBC", &gc);
assert_string_equal(best_cipher, "AES-256-GCM");
gc_free(&gc);
}
const struct CMUnitTest ncp_tests[] = {
cmocka_unit_test(test_check_ncp_ciphers_list),
cmocka_unit_test(test_extract_client_ciphers),
cmocka_unit_test(test_poor_man),
cmocka_unit_test(test_ncp_best)
};
int
main(void)
{
#if defined(ENABLE_CRYPTO_OPENSSL)
OpenSSL_add_all_algorithms();
#endif
return cmocka_run_group_tests(ncp_tests, NULL, NULL);
}
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