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/*
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* Copyright (C) 2017 Red Hat, Inc.
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*
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* Author: Nikos Mavrogiannopoulos
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*
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* This file is part of GnuTLS.
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*
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* GnuTLS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuTLS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#if defined(_WIN32)
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int main()
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{
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exit(77);
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}
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#else
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#include <string.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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#include <gnutls/gnutls.h>
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#include <gnutls/dtls.h>
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#include <signal.h>
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#include <assert.h>
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#include "cert-common.h"
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#include "utils.h"
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/* This program checks whether a TLS 1.3 client will detect
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* a TLS 1.2 rollback attempt via the server random value.
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*/
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static void server_log_func(int level, const char *str)
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{
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fprintf(stderr, "server|<%d>| %s", level, str);
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}
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static void client_log_func(int level, const char *str)
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{
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fprintf(stderr, "client|<%d>| %s", level, str);
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}
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static void client(int fd)
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{
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int ret;
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gnutls_certificate_credentials_t x509_cred;
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gnutls_session_t session;
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global_init();
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if (debug) {
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gnutls_global_set_log_function(client_log_func);
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gnutls_global_set_log_level(7);
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}
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gnutls_certificate_allocate_credentials(&x509_cred);
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gnutls_certificate_set_x509_key_mem(x509_cred, &cli_ca3_cert,
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&cli_ca3_key,
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GNUTLS_X509_FMT_PEM);
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/* Initialize TLS session
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*/
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gnutls_init(&session, GNUTLS_CLIENT);
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gnutls_handshake_set_timeout(session, 20 * 1000);
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ret = gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+VERS-TLS1.1:+VERS-TLS1.0", NULL);
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if (ret < 0)
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fail("cannot set TLS 1.2 priorities\n");
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/* put the anonymous credentials to the current session
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*/
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gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
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gnutls_transport_set_int(session, fd);
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/* Perform the TLS handshake
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*/
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do {
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ret = gnutls_handshake(session);
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}
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while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
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if (ret != GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER) {
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fail("unexpected error during rollback: %s\n", gnutls_strerror(ret));
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}
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close(fd);
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gnutls_deinit(session);
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gnutls_certificate_free_credentials(x509_cred);
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gnutls_global_deinit();
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}
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#ifdef TLS12
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# define RND tls12_rnd
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# define PRIO "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.2"
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#elif TLS11
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# define RND tls11_rnd
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# define PRIO "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.1:+VERS-TLS1.0"
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#else
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# error unknown version to test
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#endif
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gnutls_datum_t tls12_rnd = {(void*)"\x00\x00\x00\x04\x00\x00\x00\x04"
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"\x00\x00\x00\x04\x00\x00\x00\x04"
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"\x00\x00\x00\x04\x00\x00\x00\x04"
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"\x44\x4F\x57\x4E\x47\x52\x44\x01",
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32};
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gnutls_datum_t tls11_rnd = {(void*)"\x00\x00\x00\x04\x00\x00\x00\x04"
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"\x00\x00\x00\x04\x00\x00\x00\x04"
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"\x00\x00\x00\x04\x00\x00\x00\x04"
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"\x44\x4F\x57\x4E\x47\x52\x44\x00",
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32};
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static void server(int fd)
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{
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int ret;
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gnutls_session_t session;
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gnutls_certificate_credentials_t x509_cred;
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/* this must be called once in the program
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*/
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global_init();
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if (debug) {
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gnutls_global_set_log_function(server_log_func);
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gnutls_global_set_log_level(4711);
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}
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gnutls_certificate_allocate_credentials(&x509_cred);
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gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,
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&server_key,
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GNUTLS_X509_FMT_PEM);
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gnutls_init(&session, GNUTLS_SERVER);
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gnutls_handshake_set_timeout(session, 20 * 1000);
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gnutls_handshake_set_random(session, &RND);
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assert(gnutls_priority_set_direct(session, PRIO, NULL)>=0);
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gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
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gnutls_transport_set_int(session, fd);
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do {
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ret = gnutls_handshake(session);
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if (ret == GNUTLS_E_INTERRUPTED) { /* expected */
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break;
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}
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} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
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close(fd);
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gnutls_deinit(session);
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gnutls_certificate_free_credentials(x509_cred);
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gnutls_global_deinit();
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if (debug)
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success("server: client/server hello were verified\n");
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}
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static void ch_handler(int sig)
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{
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int status = 0;
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wait(&status);
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check_wait_status(status);
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return;
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}
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void doit(void)
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{
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int fd[2];
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int ret;
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pid_t child;
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signal(SIGCHLD, ch_handler);
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signal(SIGPIPE, SIG_IGN);
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ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
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if (ret < 0) {
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perror("socketpair");
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exit(1);
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}
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child = fork();
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if (child < 0) {
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perror("fork");
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fail("fork");
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exit(1);
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}
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if (child) {
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/* parent */
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close(fd[1]);
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client(fd[0]);
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kill(child, SIGTERM);
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} else {
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close(fd[0]);
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server(fd[1]);
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exit(0);
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}
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}
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#endif /* _WIN32 */
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