From ac2f71b892d13a7ab4cc39086eef179042c7e23c Mon Sep 17 00:00:00 2001 From: Nikos Mavrogiannopoulos Date: Sun, 29 Mar 2020 21:30:37 +0200 Subject: tests: added check for random value of client and server hello in TLS This creates a tests that checks whether the TLS client and server hello have sufficient non-zero bytes. Signed-off-by: Nikos Mavrogiannopoulos --- tests/Makefile.am | 2 +- tests/tls_hello_random_value.c | 267 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 268 insertions(+), 1 deletion(-) create mode 100644 tests/tls_hello_random_value.c (limited to 'tests') diff --git a/tests/Makefile.am b/tests/Makefile.am index ee6c601a45..b5a3eb673e 100644 --- a/tests/Makefile.am +++ b/tests/Makefile.am @@ -218,7 +218,7 @@ ctests += mini-record-2 simple gnutls_hmac_fast set_pkcs12_cred cert certuniquei sign-verify-newapi sign-verify-deterministic iov aead-cipher-vec \ tls13-without-timeout-func buffer status-request-revoked \ set_x509_ocsp_multi_cli kdf-api keylog-func \ - dtls_hello_random_value + dtls_hello_random_value tls_hello_random_value if HAVE_SECCOMP_TESTS ctests += dtls-with-seccomp tls-with-seccomp dtls-client-with-seccomp tls-client-with-seccomp diff --git a/tests/tls_hello_random_value.c b/tests/tls_hello_random_value.c new file mode 100644 index 0000000000..8841d2e2cc --- /dev/null +++ b/tests/tls_hello_random_value.c @@ -0,0 +1,267 @@ +/* + * Copyright (C) 2017-2020 Red Hat, Inc. + * + * Author: Nikos Mavrogiannopoulos + * + * 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 Lesser General Public License + * along with this program. If not, see + */ + +/* This program tests whether the second DTLS client hello contains the same + * random value, and whether it is initialized. + */ + +#ifdef HAVE_CONFIG_H +#include +#endif + +#include +#include + +#if defined(_WIN32) + +/* socketpair isn't supported on Win32. */ +int main(int argc, char **argv) +{ + exit(77); +} + +#else + +#include +#include +#include +#if !defined(_WIN32) +#include +#include +#endif +#include +#include +#include + +#include "utils.h" +#include "cert-common.h" + +const char *side = ""; + +static void tls_log_func(int level, const char *str) +{ + fprintf(stderr, "%s|<%d>| %s", side, level, str); +} + +static unsigned cb_called = 0; + +static int hello_callback(gnutls_session_t session, unsigned int htype, + unsigned post, unsigned int incoming, const gnutls_datum_t *msg) +{ + unsigned non_zero = 0, i; + + if (htype == GNUTLS_HANDSHAKE_CLIENT_HELLO && post == GNUTLS_HOOK_POST) { + if (cb_called == 0) { + unsigned char crandom[32]; + gnutls_datum_t tmp; + gnutls_session_get_random(session, &tmp, NULL); + assert(tmp.size == 32); + + memcpy(crandom, tmp.data, tmp.size); + cb_called++; + + /* check if uninitialized */ + for (i=0;i<32;i++) { + if (crandom[i] != 0) { + non_zero++; + } + } + if (non_zero <= 8) { + fail("the client random value seems uninitialized\n"); + } + } else { + cb_called++; + } + } else if (htype == GNUTLS_HANDSHAKE_SERVER_HELLO && post == GNUTLS_HOOK_POST) { + unsigned char crandom[32]; + gnutls_datum_t tmp; + gnutls_session_get_random(session, NULL, &tmp); + assert(tmp.size == 32); + + memcpy(crandom, tmp.data, tmp.size); + + /* check if uninitialized */ + for (i=0;i<32;i++) { + if (crandom[i] != 0) { + non_zero++; + } + } + if (non_zero <= 8) { + fail("the server random value seems uninitialized\n"); + } + } + + return 0; +} + +static void client(int sd, const char *priority) +{ + int ret; + gnutls_session_t session; + gnutls_certificate_credentials_t clientx509cred; + + gnutls_global_set_log_function(tls_log_func); + if (debug) + gnutls_global_set_log_level(4711); + + side = "client"; + + gnutls_certificate_allocate_credentials(&clientx509cred); + + assert(gnutls_init(&session, GNUTLS_CLIENT)>=0); + + if (!priority) { + assert(gnutls_set_default_priority(session) >= 0); + } else { + assert(gnutls_priority_set_direct(session, priority, NULL) >= 0); + } + + gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, + clientx509cred); + + gnutls_transport_set_int(session, sd); + gnutls_handshake_set_timeout(session, 20 * 1000); + + gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY, + GNUTLS_HOOK_BOTH, hello_callback); + + ret = gnutls_handshake(session); + + if (ret < 0) { + fail("client: Handshake failed: %s\n", gnutls_strerror(ret)); + } else { + if (debug) + success("client: Handshake was completed\n"); + } + + if (cb_called != 1) { + fail("client: the callback was not seen (%d)!\n", cb_called); + } + + gnutls_bye(session, GNUTLS_SHUT_WR); + close(sd); + + gnutls_deinit(session); + + gnutls_certificate_free_credentials(clientx509cred); +} + +static void server(int sd, const char *priority) +{ + int ret; + gnutls_certificate_credentials_t serverx509cred; + gnutls_session_t session; + + gnutls_global_set_log_function(tls_log_func); + if (debug) + gnutls_global_set_log_level(4711); + + side = "server"; + + assert(gnutls_certificate_allocate_credentials(&serverx509cred)>=0); + assert(gnutls_certificate_set_x509_key_mem(serverx509cred, + &server_cert, &server_key, + GNUTLS_X509_FMT_PEM)>=0); + + assert(gnutls_init(&session, GNUTLS_SERVER)>=0); + assert(session != NULL); + + if (!priority) { + assert(gnutls_set_default_priority(session) >= 0); + } else { + assert(gnutls_priority_set_direct(session, priority, NULL) >= 0); + } + + gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, + serverx509cred); + + gnutls_transport_set_int(session, sd); + gnutls_handshake_set_timeout(session, 20 * 1000); + + ret = gnutls_handshake(session); + if (ret < 0) { + fail("server: Handshake has failed: %s\n\n", + gnutls_strerror(ret)); + } + if (debug) + success("server: Handshake was completed\n"); + + /* do not wait for the peer to close the connection. + */ + gnutls_bye(session, GNUTLS_SHUT_WR); + close(sd); + gnutls_deinit(session); + + gnutls_certificate_free_credentials(serverx509cred); + + if (debug) + success("server: finished\n"); +} + +static void start(const char *name, const char *priority) +{ + pid_t child; + int sockets[2]; + int err; + + success("testing: %s\n", name); + cb_called = 0; + + err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets); + if (err == -1) { + perror("socketpair"); + fail("socketpair failed\n"); + return; + } + + child = fork(); + if (child < 0) { + perror("fork"); + fail("fork"); + return; + } + + if (child) { + int status = 0; + /* parent */ + close(sockets[1]); + client(sockets[0], priority); + wait(&status); + check_wait_status(status); + } else { + close(sockets[0]); + server(sockets[1], priority); + exit(0); + } +} + +void doit(void) +{ + signal(SIGPIPE, SIG_IGN); + + start("default", NULL); + start("tls1.3", "NORMAL:-VERS-ALL:+VERS-TLS1.3"); + start("tls1.2", "NORMAL:-VERS-ALL:+VERS-TLS1.2"); + start("tls1.1", "NORMAL:-VERS-ALL:+VERS-TLS1.1"); + start("tls1.0", "NORMAL:-VERS-ALL:+VERS-TLS1.0"); +} + +#endif /* _WIN32 */ -- cgit v1.2.1