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/* $OpenBSD: cipher_list.c,v 1.2 2015/06/28 00:08:27 doug Exp $ */
/*
* Copyright (c) 2015 Doug Hogan <doug@openbsd.org>
* Copyright (c) 2015 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Test TLS ssl bytes (aka cipher suites) to cipher list and back.
*
* TLSv1.0 - RFC 2246 section 7.4.1.2 (ClientHello struct)
* TLSv1.1 - RFC 4346 section 7.4.1.2 (ClientHello struct)
* TLSv1.2 - RFC 5246 section 7.4.1.2 (ClientHello struct)
*
* In all of these standards, the relevant structures are:
*
* uint8 CipherSuite[2];
*
* struct {
* ...
* CipherSuite cipher_suites<2..2^16-2>
* ...
* } ClientHello;
*/
#include <openssl/ssl.h>
#include <stdio.h>
#include <string.h>
#include "tests.h"
static uint8_t cipher_bytes[] = {
0xcc, 0x14, /* ECDHE-ECDSA-CHACHA20-POLY1305 */
0xcc, 0x13, /* ECDHE-RSA-CHACHA20-POLY1305 */
0xcc, 0x15, /* DHE-RSA-CHACHA20-POLY1305 */
0x00, 0x9c, /* AES128-GCM-SHA256 */
0x00, 0x3d, /* AES256-SHA256 */
0x00, 0x09, /* DES-CBC-SHA */
};
static uint16_t cipher_values[] = {
0xcc14, /* ECDHE-ECDSA-CHACHA20-POLY1305 */
0xcc13, /* ECDHE-RSA-CHACHA20-POLY1305 */
0xcc15, /* DHE-RSA-CHACHA20-POLY1305 */
0x009c, /* AES128-GCM-SHA256 */
0x003d, /* AES256-SHA256 */
0x0009, /* DES-CBC-SHA */
};
#define N_CIPHERS (sizeof(cipher_bytes) / 2)
extern STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
const unsigned char *p, int num);
extern int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
unsigned char *p);
static int
ssl_bytes_to_list_alloc(SSL *s, STACK_OF(SSL_CIPHER) **ciphers)
{
SSL_CIPHER *cipher;
uint16_t value;
int i;
*ciphers = ssl_bytes_to_cipher_list(s, cipher_bytes,
sizeof(cipher_bytes));
CHECK(*ciphers != NULL);
CHECK(sk_SSL_CIPHER_num(*ciphers) == N_CIPHERS);
for (i = 0; i < sk_SSL_CIPHER_num(*ciphers); i++) {
cipher = sk_SSL_CIPHER_value(*ciphers, i);
CHECK(cipher != NULL);
value = SSL_CIPHER_get_value(cipher);
CHECK(value == cipher_values[i]);
}
return 1;
}
static int
ssl_list_to_bytes_scsv(SSL *s, STACK_OF(SSL_CIPHER) **ciphers)
{
unsigned char *buf = NULL;
size_t buflen;
int len;
int ret = 0;
/* Space for cipher bytes, plus reneg SCSV and two spare bytes. */
CHECK(sk_SSL_CIPHER_num(*ciphers) == N_CIPHERS);
buflen = sizeof(cipher_bytes) + 2 + 2;
CHECK((buf = calloc(1, buflen)) != NULL);
len = ssl_cipher_list_to_bytes(s, *ciphers, buf);
CHECK_GOTO(len > 0 && (size_t)len == buflen - 2);
CHECK_GOTO(memcmp(buf, cipher_bytes, sizeof(cipher_bytes)) == 0);
CHECK_GOTO(buf[buflen - 4] == 0x00 && buf[buflen - 3] == 0xff);
CHECK_GOTO(buf[buflen - 2] == 0x00 && buf[buflen - 1] == 0x00);
ret = 1;
err:
free(buf);
return ret;
}
static int
ssl_list_to_bytes_no_scsv(SSL *s, STACK_OF(SSL_CIPHER) **ciphers)
{
unsigned char *buf = NULL;
size_t buflen;
int len;
int ret = 0;
/* Space for cipher bytes and two spare bytes */
CHECK(sk_SSL_CIPHER_num(*ciphers) == N_CIPHERS);
buflen = sizeof(cipher_bytes) + 2;
CHECK((buf = calloc(1, buflen)) != NULL);
buf[buflen - 2] = 0xfe;
buf[buflen - 1] = 0xab;
/* Set renegotiate so it doesn't add SCSV */
s->renegotiate = 1;
len = ssl_cipher_list_to_bytes(s, *ciphers, buf);
CHECK_GOTO(len > 0 && (size_t)len == buflen - 2);
CHECK_GOTO(memcmp(buf, cipher_bytes, sizeof(cipher_bytes)) == 0);
CHECK_GOTO(buf[buflen - 2] == 0xfe && buf[buflen - 1] == 0xab);
ret = 1;
err:
free(buf);
return ret;
}
static int
ssl_bytes_to_list_invalid(SSL *s, STACK_OF(SSL_CIPHER) **ciphers)
{
uint8_t empty_cipher_bytes[] = { };
sk_SSL_CIPHER_free(*ciphers);
/* Invalid length: CipherSuite is 2 bytes so it must be even */
*ciphers = ssl_bytes_to_cipher_list(s, cipher_bytes,
sizeof(cipher_bytes) - 1);
CHECK(*ciphers == NULL);
/* Invalid length: cipher_suites must be at least 2 */
*ciphers = ssl_bytes_to_cipher_list(s, empty_cipher_bytes,
sizeof(empty_cipher_bytes));
CHECK(*ciphers == NULL);
/* Invalid length: cipher_suites must be at most 2^16-2 */
*ciphers = ssl_bytes_to_cipher_list(s, cipher_bytes, 0x10000);
CHECK(*ciphers == NULL);
/* Invalid len: prototype is signed, but it shouldn't accept len < 0 */
*ciphers = ssl_bytes_to_cipher_list(s, cipher_bytes, -2);
CHECK(*ciphers == NULL);
return 1;
}
int
main(void)
{
STACK_OF(SSL_CIPHER) *ciphers = NULL;
SSL_CTX *ctx = NULL;
SSL *s = NULL;
int rv = 1;
SSL_library_init();
/* Use TLSv1.2 client to get all ciphers. */
CHECK_GOTO((ctx = SSL_CTX_new(TLSv1_2_client_method())) != NULL);
CHECK_GOTO((s = SSL_new(ctx)) != NULL);
if (!ssl_bytes_to_list_alloc(s, &ciphers))
goto err;
if (!ssl_list_to_bytes_scsv(s, &ciphers))
goto err;
if (!ssl_list_to_bytes_no_scsv(s, &ciphers))
goto err;
if (!ssl_bytes_to_list_invalid(s, &ciphers))
goto err;
rv = 0;
err:
sk_SSL_CIPHER_free(ciphers);
SSL_CTX_free(ctx);
SSL_free(s);
if (!rv)
printf("PASS %s\n", __FILE__);
return rv;
}
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