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qemu/tests/test-crypto-tlssession.c
Daniel P. Berrangé db0a8c70f2 tests: fix TLS handshake failure with TLS 1.3 
When gnutls negotiates TLS 1.3 instead of 1.2, the order of messages
sent by the handshake changes. This exposed a logic bug in the test
suite which caused us to wait for the server to see handshake
completion, but not wait for the client to see completion. The result
was the client didn't receive the certificate for verification and the
test failed.

This is exposed in Fedora 29 rawhide which has just enabled TLS 1.3 in
its GNUTLS builds.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-07-24 17:36:12 +01:00

655 lines
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/*
* Copyright (C) 2015 Red Hat, Inc.
*
* This library 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 library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Author: Daniel P. Berrange <berrange@redhat.com>
*/
#include "qemu/osdep.h"
#include "crypto-tls-x509-helpers.h"
#include "crypto-tls-psk-helpers.h"
#include "crypto/tlscredsx509.h"
#include "crypto/tlscredspsk.h"
#include "crypto/tlssession.h"
#include "qom/object_interfaces.h"
#include "qapi/error.h"
#include "qemu/sockets.h"
#include "qemu/acl.h"
#ifdef QCRYPTO_HAVE_TLS_TEST_SUPPORT
#define WORKDIR "tests/test-crypto-tlssession-work/"
#define PSKFILE WORKDIR "keys.psk"
#define KEYFILE WORKDIR "key-ctx.pem"
static ssize_t testWrite(const char *buf, size_t len, void *opaque)
{
int *fd = opaque;
return write(*fd, buf, len);
}
static ssize_t testRead(char *buf, size_t len, void *opaque)
{
int *fd = opaque;
return read(*fd, buf, len);
}
static QCryptoTLSCreds *test_tls_creds_psk_create(
QCryptoTLSCredsEndpoint endpoint,
const char *dir)
{
Object *parent = object_get_objects_root();
Object *creds = object_new_with_props(
TYPE_QCRYPTO_TLS_CREDS_PSK,
parent,
(endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER ?
"testtlscredsserver" : "testtlscredsclient"),
&error_abort,
"endpoint", (endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER ?
"server" : "client"),
"dir", dir,
"priority", "NORMAL",
NULL
);
return QCRYPTO_TLS_CREDS(creds);
}
static void test_crypto_tls_session_psk(void)
{
QCryptoTLSCreds *clientCreds;
QCryptoTLSCreds *serverCreds;
QCryptoTLSSession *clientSess = NULL;
QCryptoTLSSession *serverSess = NULL;
int channel[2];
bool clientShake = false;
bool serverShake = false;
int ret;
/* We'll use this for our fake client-server connection */
ret = socketpair(AF_UNIX, SOCK_STREAM, 0, channel);
g_assert(ret == 0);
/*
* We have an evil loop to do the handshake in a single
* thread, so we need these non-blocking to avoid deadlock
* of ourselves
*/
qemu_set_nonblock(channel[0]);
qemu_set_nonblock(channel[1]);
clientCreds = test_tls_creds_psk_create(
QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT,
WORKDIR);
g_assert(clientCreds != NULL);
serverCreds = test_tls_creds_psk_create(
QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
WORKDIR);
g_assert(serverCreds != NULL);
/* Now the real part of the test, setup the sessions */
clientSess = qcrypto_tls_session_new(
clientCreds, NULL, NULL,
QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, &error_abort);
g_assert(clientSess != NULL);
serverSess = qcrypto_tls_session_new(
serverCreds, NULL, NULL,
QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, &error_abort);
g_assert(serverSess != NULL);
/* For handshake to work, we need to set the I/O callbacks
* to read/write over the socketpair
*/
qcrypto_tls_session_set_callbacks(serverSess,
testWrite, testRead,
&channel[0]);
qcrypto_tls_session_set_callbacks(clientSess,
testWrite, testRead,
&channel[1]);
/*
* Finally we loop around & around doing handshake on each
* session until we get an error, or the handshake completes.
* This relies on the socketpair being nonblocking to avoid
* deadlocking ourselves upon handshake
*/
do {
int rv;
if (!serverShake) {
rv = qcrypto_tls_session_handshake(serverSess,
&error_abort);
g_assert(rv >= 0);
if (qcrypto_tls_session_get_handshake_status(serverSess) ==
QCRYPTO_TLS_HANDSHAKE_COMPLETE) {
serverShake = true;
}
}
if (!clientShake) {
rv = qcrypto_tls_session_handshake(clientSess,
&error_abort);
g_assert(rv >= 0);
if (qcrypto_tls_session_get_handshake_status(clientSess) ==
QCRYPTO_TLS_HANDSHAKE_COMPLETE) {
clientShake = true;
}
}
} while (!clientShake || !serverShake);
/* Finally make sure the server & client validation is successful. */
g_assert(qcrypto_tls_session_check_credentials(serverSess,
&error_abort) == 0);
g_assert(qcrypto_tls_session_check_credentials(clientSess,
&error_abort) == 0);
object_unparent(OBJECT(serverCreds));
object_unparent(OBJECT(clientCreds));
qcrypto_tls_session_free(serverSess);
qcrypto_tls_session_free(clientSess);
close(channel[0]);
close(channel[1]);
}
struct QCryptoTLSSessionTestData {
const char *servercacrt;
const char *clientcacrt;
const char *servercrt;
const char *clientcrt;
bool expectServerFail;
bool expectClientFail;
const char *hostname;
const char *const *wildcards;
};
static QCryptoTLSCreds *test_tls_creds_x509_create(
QCryptoTLSCredsEndpoint endpoint,
const char *certdir)
{
Object *parent = object_get_objects_root();
Object *creds = object_new_with_props(
TYPE_QCRYPTO_TLS_CREDS_X509,
parent,
(endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER ?
"testtlscredsserver" : "testtlscredsclient"),
&error_abort,
"endpoint", (endpoint == QCRYPTO_TLS_CREDS_ENDPOINT_SERVER ?
"server" : "client"),
"dir", certdir,
"verify-peer", "yes",
"priority", "NORMAL",
/* We skip initial sanity checks here because we
* want to make sure that problems are being
* detected at the TLS session validation stage,
* and the test-crypto-tlscreds test already
* validate the sanity check code.
*/
"sanity-check", "no",
NULL
);
return QCRYPTO_TLS_CREDS(creds);
}
/*
* This tests validation checking of peer certificates
*
* This is replicating the checks that are done for an
* active TLS session after handshake completes. To
* simulate that we create our TLS contexts, skipping
* sanity checks. We then get a socketpair, and
* initiate a TLS session across them. Finally do
* do actual cert validation tests
*/
static void test_crypto_tls_session_x509(const void *opaque)
{
struct QCryptoTLSSessionTestData *data =
(struct QCryptoTLSSessionTestData *)opaque;
QCryptoTLSCreds *clientCreds;
QCryptoTLSCreds *serverCreds;
QCryptoTLSSession *clientSess = NULL;
QCryptoTLSSession *serverSess = NULL;
qemu_acl *acl;
const char * const *wildcards;
int channel[2];
bool clientShake = false;
bool serverShake = false;
int ret;
/* We'll use this for our fake client-server connection */
ret = socketpair(AF_UNIX, SOCK_STREAM, 0, channel);
g_assert(ret == 0);
/*
* We have an evil loop to do the handshake in a single
* thread, so we need these non-blocking to avoid deadlock
* of ourselves
*/
qemu_set_nonblock(channel[0]);
qemu_set_nonblock(channel[1]);
#define CLIENT_CERT_DIR "tests/test-crypto-tlssession-client/"
#define SERVER_CERT_DIR "tests/test-crypto-tlssession-server/"
mkdir(CLIENT_CERT_DIR, 0700);
mkdir(SERVER_CERT_DIR, 0700);
unlink(SERVER_CERT_DIR QCRYPTO_TLS_CREDS_X509_CA_CERT);
unlink(SERVER_CERT_DIR QCRYPTO_TLS_CREDS_X509_SERVER_CERT);
unlink(SERVER_CERT_DIR QCRYPTO_TLS_CREDS_X509_SERVER_KEY);
unlink(CLIENT_CERT_DIR QCRYPTO_TLS_CREDS_X509_CA_CERT);
unlink(CLIENT_CERT_DIR QCRYPTO_TLS_CREDS_X509_CLIENT_CERT);
unlink(CLIENT_CERT_DIR QCRYPTO_TLS_CREDS_X509_CLIENT_KEY);
g_assert(link(data->servercacrt,
SERVER_CERT_DIR QCRYPTO_TLS_CREDS_X509_CA_CERT) == 0);
g_assert(link(data->servercrt,
SERVER_CERT_DIR QCRYPTO_TLS_CREDS_X509_SERVER_CERT) == 0);
g_assert(link(KEYFILE,
SERVER_CERT_DIR QCRYPTO_TLS_CREDS_X509_SERVER_KEY) == 0);
g_assert(link(data->clientcacrt,
CLIENT_CERT_DIR QCRYPTO_TLS_CREDS_X509_CA_CERT) == 0);
g_assert(link(data->clientcrt,
CLIENT_CERT_DIR QCRYPTO_TLS_CREDS_X509_CLIENT_CERT) == 0);
g_assert(link(KEYFILE,
CLIENT_CERT_DIR QCRYPTO_TLS_CREDS_X509_CLIENT_KEY) == 0);
clientCreds = test_tls_creds_x509_create(
QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT,
CLIENT_CERT_DIR);
g_assert(clientCreds != NULL);
serverCreds = test_tls_creds_x509_create(
QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
SERVER_CERT_DIR);
g_assert(serverCreds != NULL);
acl = qemu_acl_init("tlssessionacl");
qemu_acl_reset(acl);
wildcards = data->wildcards;
while (wildcards && *wildcards) {
qemu_acl_append(acl, 0, *wildcards);
wildcards++;
}
/* Now the real part of the test, setup the sessions */
clientSess = qcrypto_tls_session_new(
clientCreds, data->hostname, NULL,
QCRYPTO_TLS_CREDS_ENDPOINT_CLIENT, &error_abort);
g_assert(clientSess != NULL);
serverSess = qcrypto_tls_session_new(
serverCreds, NULL,
data->wildcards ? "tlssessionacl" : NULL,
QCRYPTO_TLS_CREDS_ENDPOINT_SERVER, &error_abort);
g_assert(serverSess != NULL);
/* For handshake to work, we need to set the I/O callbacks
* to read/write over the socketpair
*/
qcrypto_tls_session_set_callbacks(serverSess,
testWrite, testRead,
&channel[0]);
qcrypto_tls_session_set_callbacks(clientSess,
testWrite, testRead,
&channel[1]);
/*
* Finally we loop around & around doing handshake on each
* session until we get an error, or the handshake completes.
* This relies on the socketpair being nonblocking to avoid
* deadlocking ourselves upon handshake
*/
do {
int rv;
if (!serverShake) {
rv = qcrypto_tls_session_handshake(serverSess,
&error_abort);
g_assert(rv >= 0);
if (qcrypto_tls_session_get_handshake_status(serverSess) ==
QCRYPTO_TLS_HANDSHAKE_COMPLETE) {
serverShake = true;
}
}
if (!clientShake) {
rv = qcrypto_tls_session_handshake(clientSess,
&error_abort);
g_assert(rv >= 0);
if (qcrypto_tls_session_get_handshake_status(clientSess) ==
QCRYPTO_TLS_HANDSHAKE_COMPLETE) {
clientShake = true;
}
}
} while (!clientShake || !serverShake);
/* Finally make sure the server validation does what
* we were expecting
*/
if (qcrypto_tls_session_check_credentials(
serverSess, data->expectServerFail ? NULL : &error_abort) < 0) {
g_assert(data->expectServerFail);
} else {
g_assert(!data->expectServerFail);
}
/*
* And the same for the client validation check
*/
if (qcrypto_tls_session_check_credentials(
clientSess, data->expectClientFail ? NULL : &error_abort) < 0) {
g_assert(data->expectClientFail);
} else {
g_assert(!data->expectClientFail);
}
unlink(SERVER_CERT_DIR QCRYPTO_TLS_CREDS_X509_CA_CERT);
unlink(SERVER_CERT_DIR QCRYPTO_TLS_CREDS_X509_SERVER_CERT);
unlink(SERVER_CERT_DIR QCRYPTO_TLS_CREDS_X509_SERVER_KEY);
unlink(CLIENT_CERT_DIR QCRYPTO_TLS_CREDS_X509_CA_CERT);
unlink(CLIENT_CERT_DIR QCRYPTO_TLS_CREDS_X509_CLIENT_CERT);
unlink(CLIENT_CERT_DIR QCRYPTO_TLS_CREDS_X509_CLIENT_KEY);
rmdir(CLIENT_CERT_DIR);
rmdir(SERVER_CERT_DIR);
object_unparent(OBJECT(serverCreds));
object_unparent(OBJECT(clientCreds));
qcrypto_tls_session_free(serverSess);
qcrypto_tls_session_free(clientSess);
close(channel[0]);
close(channel[1]);
}
int main(int argc, char **argv)
{
int ret;
module_call_init(MODULE_INIT_QOM);
g_test_init(&argc, &argv, NULL);
setenv("GNUTLS_FORCE_FIPS_MODE", "2", 1);
mkdir(WORKDIR, 0700);
test_tls_init(KEYFILE);
test_tls_psk_init(PSKFILE);
/* Simple initial test using Pre-Shared Keys. */
g_test_add_func("/qcrypto/tlssession/psk",
test_crypto_tls_session_psk);
/* More complex tests using X.509 certificates. */
# define TEST_SESS_REG(name, caCrt, \
serverCrt, clientCrt, \
expectServerFail, expectClientFail, \
hostname, wildcards) \
struct QCryptoTLSSessionTestData name = { \
caCrt, caCrt, serverCrt, clientCrt, \
expectServerFail, expectClientFail, \
hostname, wildcards \
}; \
g_test_add_data_func("/qcrypto/tlssession/" # name, \
&name, test_crypto_tls_session_x509); \
# define TEST_SESS_REG_EXT(name, serverCaCrt, clientCaCrt, \
serverCrt, clientCrt, \
expectServerFail, expectClientFail, \
hostname, wildcards) \
struct QCryptoTLSSessionTestData name = { \
serverCaCrt, clientCaCrt, serverCrt, clientCrt, \
expectServerFail, expectClientFail, \
hostname, wildcards \
}; \
g_test_add_data_func("/qcrypto/tlssession/" # name, \
&name, test_crypto_tls_session_x509); \
/* A perfect CA, perfect client & perfect server */
/* Basic:CA:critical */
TLS_ROOT_REQ(cacertreq,
"UK", "qemu CA", NULL, NULL, NULL, NULL,
true, true, true,
true, true, GNUTLS_KEY_KEY_CERT_SIGN,
false, false, NULL, NULL,
0, 0);
TLS_ROOT_REQ(altcacertreq,
"UK", "qemu CA 1", NULL, NULL, NULL, NULL,
true, true, true,
false, false, 0,
false, false, NULL, NULL,
0, 0);
TLS_CERT_REQ(servercertreq, cacertreq,
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TLS_CERT_REQ(clientcertreq, cacertreq,
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, 0);
TLS_CERT_REQ(clientcertaltreq, altcacertreq,
"UK", "qemu", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, 0);
TEST_SESS_REG(basicca, cacertreq.filename,
servercertreq.filename, clientcertreq.filename,
false, false, "qemu.org", NULL);
TEST_SESS_REG_EXT(differentca, cacertreq.filename,
altcacertreq.filename, servercertreq.filename,
clientcertaltreq.filename, true, true, "qemu.org", NULL);
/* When an altname is set, the CN is ignored, so it must be duplicated
* as an altname for it to match */
TLS_CERT_REQ(servercertalt1req, cacertreq,
"UK", "qemu.org", "www.qemu.org", "qemu.org",
"192.168.122.1", "fec0::dead:beaf",
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
/* This intentionally doesn't replicate */
TLS_CERT_REQ(servercertalt2req, cacertreq,
"UK", "qemu.org", "www.qemu.org", "wiki.qemu.org",
"192.168.122.1", "fec0::dead:beaf",
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TEST_SESS_REG(altname1, cacertreq.filename,
servercertalt1req.filename, clientcertreq.filename,
false, false, "qemu.org", NULL);
TEST_SESS_REG(altname2, cacertreq.filename,
servercertalt1req.filename, clientcertreq.filename,
false, false, "www.qemu.org", NULL);
TEST_SESS_REG(altname3, cacertreq.filename,
servercertalt1req.filename, clientcertreq.filename,
false, true, "wiki.qemu.org", NULL);
TEST_SESS_REG(altname4, cacertreq.filename,
servercertalt2req.filename, clientcertreq.filename,
false, true, "qemu.org", NULL);
TEST_SESS_REG(altname5, cacertreq.filename,
servercertalt2req.filename, clientcertreq.filename,
false, false, "www.qemu.org", NULL);
TEST_SESS_REG(altname6, cacertreq.filename,
servercertalt2req.filename, clientcertreq.filename,
false, false, "wiki.qemu.org", NULL);
const char *const wildcards1[] = {
"C=UK,CN=dogfood",
NULL,
};
const char *const wildcards2[] = {
"C=UK,CN=qemu",
NULL,
};
const char *const wildcards3[] = {
"C=UK,CN=dogfood",
"C=UK,CN=qemu",
NULL,
};
const char *const wildcards4[] = {
"C=UK,CN=qemustuff",
NULL,
};
const char *const wildcards5[] = {
"C=UK,CN=qemu*",
NULL,
};
const char *const wildcards6[] = {
"C=UK,CN=*emu*",
NULL,
};
TEST_SESS_REG(wildcard1, cacertreq.filename,
servercertreq.filename, clientcertreq.filename,
true, false, "qemu.org", wildcards1);
TEST_SESS_REG(wildcard2, cacertreq.filename,
servercertreq.filename, clientcertreq.filename,
false, false, "qemu.org", wildcards2);
TEST_SESS_REG(wildcard3, cacertreq.filename,
servercertreq.filename, clientcertreq.filename,
false, false, "qemu.org", wildcards3);
TEST_SESS_REG(wildcard4, cacertreq.filename,
servercertreq.filename, clientcertreq.filename,
true, false, "qemu.org", wildcards4);
TEST_SESS_REG(wildcard5, cacertreq.filename,
servercertreq.filename, clientcertreq.filename,
false, false, "qemu.org", wildcards5);
TEST_SESS_REG(wildcard6, cacertreq.filename,
servercertreq.filename, clientcertreq.filename,
false, false, "qemu.org", wildcards6);
TLS_ROOT_REQ(cacertrootreq,
"UK", "qemu root", NULL, NULL, NULL, NULL,
true, true, true,
true, true, GNUTLS_KEY_KEY_CERT_SIGN,
false, false, NULL, NULL,
0, 0);
TLS_CERT_REQ(cacertlevel1areq, cacertrootreq,
"UK", "qemu level 1a", NULL, NULL, NULL, NULL,
true, true, true,
true, true, GNUTLS_KEY_KEY_CERT_SIGN,
false, false, NULL, NULL,
0, 0);
TLS_CERT_REQ(cacertlevel1breq, cacertrootreq,
"UK", "qemu level 1b", NULL, NULL, NULL, NULL,
true, true, true,
true, true, GNUTLS_KEY_KEY_CERT_SIGN,
false, false, NULL, NULL,
0, 0);
TLS_CERT_REQ(cacertlevel2areq, cacertlevel1areq,
"UK", "qemu level 2a", NULL, NULL, NULL, NULL,
true, true, true,
true, true, GNUTLS_KEY_KEY_CERT_SIGN,
false, false, NULL, NULL,
0, 0);
TLS_CERT_REQ(servercertlevel3areq, cacertlevel2areq,
"UK", "qemu.org", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
true, true, GNUTLS_KP_TLS_WWW_SERVER, NULL,
0, 0);
TLS_CERT_REQ(clientcertlevel2breq, cacertlevel1breq,
"UK", "qemu client level 2b", NULL, NULL, NULL, NULL,
true, true, false,
true, true,
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
true, true, GNUTLS_KP_TLS_WWW_CLIENT, NULL,
0, 0);
gnutls_x509_crt_t certchain[] = {
cacertrootreq.crt,
cacertlevel1areq.crt,
cacertlevel1breq.crt,
cacertlevel2areq.crt,
};
test_tls_write_cert_chain(WORKDIR "cacertchain-sess.pem",
certchain,
G_N_ELEMENTS(certchain));
TEST_SESS_REG(cachain, WORKDIR "cacertchain-sess.pem",
servercertlevel3areq.filename, clientcertlevel2breq.filename,
false, false, "qemu.org", NULL);
ret = g_test_run();
test_tls_discard_cert(&clientcertreq);
test_tls_discard_cert(&clientcertaltreq);
test_tls_discard_cert(&servercertreq);
test_tls_discard_cert(&servercertalt1req);
test_tls_discard_cert(&servercertalt2req);
test_tls_discard_cert(&cacertreq);
test_tls_discard_cert(&altcacertreq);
test_tls_discard_cert(&cacertrootreq);
test_tls_discard_cert(&cacertlevel1areq);
test_tls_discard_cert(&cacertlevel1breq);
test_tls_discard_cert(&cacertlevel2areq);
test_tls_discard_cert(&servercertlevel3areq);
test_tls_discard_cert(&clientcertlevel2breq);
unlink(WORKDIR "cacertchain-sess.pem");
test_tls_psk_cleanup(PSKFILE);
test_tls_cleanup(KEYFILE);
rmdir(WORKDIR);
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
#else /* ! QCRYPTO_HAVE_TLS_TEST_SUPPORT */
int
main(void)
{
return EXIT_SUCCESS;
}
#endif /* ! QCRYPTO_HAVE_TLS_TEST_SUPPORT */
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