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/*
* Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include "ssltestlib.h"
#include "testutil.h"
static int docorrupt = 0;
static void copy_flags(BIO *bio)
{
int flags;
BIO *next = BIO_next(bio);
flags = BIO_test_flags(next, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY | BIO_FLAGS_RWS);
BIO_set_flags(bio, flags);
}
static int tls_corrupt_read(BIO *bio, char *out, int outl)
{
int ret;
BIO *next = BIO_next(bio);
ret = BIO_read(next, out, outl);
copy_flags(bio);
return ret;
}
static int tls_corrupt_write(BIO *bio, const char *in, int inl)
{
int ret;
BIO *next = BIO_next(bio);
char *copy;
if (docorrupt) {
if (!TEST_ptr(copy = BUF_memdup(in, inl)))
return 0;
/* corrupt last bit of application data */
copy[inl-1] ^= 1;
ret = BIO_write(next, copy, inl);
OPENSSL_free(copy);
} else {
ret = BIO_write(next, in, inl);
}
copy_flags(bio);
return ret;
}
static long tls_corrupt_ctrl(BIO *bio, int cmd, long num, void *ptr)
{
long ret;
BIO *next = BIO_next(bio);
if (next == NULL)
return 0;
switch (cmd) {
case BIO_CTRL_DUP:
ret = 0L;
break;
default:
ret = BIO_ctrl(next, cmd, num, ptr);
break;
}
return ret;
}
static int tls_corrupt_gets(BIO *bio, char *buf, int size)
{
/* We don't support this - not needed anyway */
return -1;
}
static int tls_corrupt_puts(BIO *bio, const char *str)
{
/* We don't support this - not needed anyway */
return -1;
}
static int tls_corrupt_new(BIO *bio)
{
BIO_set_init(bio, 1);
return 1;
}
static int tls_corrupt_free(BIO *bio)
{
BIO_set_init(bio, 0);
return 1;
}
#define BIO_TYPE_CUSTOM_FILTER (0x80 | BIO_TYPE_FILTER)
static BIO_METHOD *method_tls_corrupt = NULL;
/* Note: Not thread safe! */
static const BIO_METHOD *bio_f_tls_corrupt_filter(void)
{
if (method_tls_corrupt == NULL) {
method_tls_corrupt = BIO_meth_new(BIO_TYPE_CUSTOM_FILTER,
"TLS corrupt filter");
if ( method_tls_corrupt == NULL
|| !BIO_meth_set_write(method_tls_corrupt, tls_corrupt_write)
|| !BIO_meth_set_read(method_tls_corrupt, tls_corrupt_read)
|| !BIO_meth_set_puts(method_tls_corrupt, tls_corrupt_puts)
|| !BIO_meth_set_gets(method_tls_corrupt, tls_corrupt_gets)
|| !BIO_meth_set_ctrl(method_tls_corrupt, tls_corrupt_ctrl)
|| !BIO_meth_set_create(method_tls_corrupt, tls_corrupt_new)
|| !BIO_meth_set_destroy(method_tls_corrupt, tls_corrupt_free))
return NULL;
}
return method_tls_corrupt;
}
static void bio_f_tls_corrupt_filter_free(void)
{
BIO_meth_free(method_tls_corrupt);
}
/*
* The test is supposed to be executed with RSA key, customarily
* with apps/server.pem used even in other tests. For this reason
* |cipher_list| is initialized with RSA ciphers' names. This
* naturally means that if test is to be re-purposed for other
* type of key, then NID_auth_* filter below would need adjustment.
*/
static const char **cipher_list = NULL;
static int setup_cipher_list(void)
{
SSL_CTX *ctx = NULL;
SSL *ssl = NULL;
STACK_OF(SSL_CIPHER) *sk_ciphers = NULL;
int i, j, numciphers = 0;
if (!TEST_ptr(ctx = SSL_CTX_new(TLS_server_method()))
|| !TEST_ptr(ssl = SSL_new(ctx))
|| !TEST_ptr(sk_ciphers = SSL_get1_supported_ciphers(ssl)))
goto err;
/*
* The |cipher_list| will be filled only with names of RSA ciphers,
* so that some of the allocated space will be wasted, but the loss
* is deemed acceptable...
*/
cipher_list = OPENSSL_malloc(sk_SSL_CIPHER_num(sk_ciphers) *
sizeof(cipher_list[0]));
if (!TEST_ptr(cipher_list))
goto err;
for (j = 0, i = 0; i < sk_SSL_CIPHER_num(sk_ciphers); i++) {
const SSL_CIPHER *cipher = sk_SSL_CIPHER_value(sk_ciphers, i);
if (SSL_CIPHER_get_auth_nid(cipher) == NID_auth_rsa)
cipher_list[j++] = SSL_CIPHER_get_name(cipher);
}
if (TEST_int_ne(j, 0))
numciphers = j;
err:
sk_SSL_CIPHER_free(sk_ciphers);
SSL_free(ssl);
SSL_CTX_free(ctx);
return numciphers;
}
static char *cert = NULL;
static char *privkey = NULL;
static int test_ssl_corrupt(int testidx)
{
static unsigned char junk[16000] = { 0 };
SSL_CTX *sctx = NULL, *cctx = NULL;
SSL *server = NULL, *client = NULL;
BIO *c_to_s_fbio;
int testresult = 0;
STACK_OF(SSL_CIPHER) *ciphers;
const SSL_CIPHER *currcipher;
docorrupt = 0;
TEST_info("Starting #%d, %s", testidx, cipher_list[testidx]);
if (!TEST_true(create_ssl_ctx_pair(TLS_server_method(), TLS_client_method(),
TLS1_VERSION, TLS_MAX_VERSION,
&sctx, &cctx, cert, privkey)))
return 0;
if (!TEST_true(SSL_CTX_set_cipher_list(cctx, cipher_list[testidx]))
|| !TEST_true(SSL_CTX_set_ciphersuites(cctx, ""))
|| !TEST_ptr(ciphers = SSL_CTX_get_ciphers(cctx))
|| !TEST_int_eq(sk_SSL_CIPHER_num(ciphers), 1)
|| !TEST_ptr(currcipher = sk_SSL_CIPHER_value(ciphers, 0)))
goto end;
/*
* No ciphers we are using are TLSv1.3 compatible so we should not attempt
* to negotiate TLSv1.3
*/
if (!TEST_true(SSL_CTX_set_max_proto_version(cctx, TLS1_2_VERSION)))
goto end;
if (!TEST_ptr(c_to_s_fbio = BIO_new(bio_f_tls_corrupt_filter())))
goto end;
/* BIO is freed by create_ssl_connection on error */
if (!TEST_true(create_ssl_objects(sctx, cctx, &server, &client, NULL,
c_to_s_fbio)))
goto end;
if (!TEST_true(create_ssl_connection(server, client, SSL_ERROR_NONE)))
goto end;
docorrupt = 1;
if (!TEST_int_ge(SSL_write(client, junk, sizeof(junk)), 0))
goto end;
if (!TEST_int_lt(SSL_read(server, junk, sizeof(junk)), 0))
goto end;
if (!TEST_int_eq(ERR_GET_REASON(ERR_peek_error()),
SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC))
goto end;
testresult = 1;
end:
SSL_free(server);
SSL_free(client);
SSL_CTX_free(sctx);
SSL_CTX_free(cctx);
return testresult;
}
int setup_tests(void)
{
int n;
if (!TEST_ptr(cert = test_get_argument(0))
|| !TEST_ptr(privkey = test_get_argument(1))) {
TEST_note("Usage error: require cert and private key files");
return 0;
}
n = setup_cipher_list();
if (n > 0)
ADD_ALL_TESTS(test_ssl_corrupt, n);
return 1;
}
void cleanup_tests(void)
{
bio_f_tls_corrupt_filter_free();
OPENSSL_free(cipher_list);
}
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