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wolfssl-examples/tls/client-tls13.c

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/* client-tls13.c
*
* Copyright (C) 2006-2020 wolfSSL Inc.
*
* This file is part of wolfSSL. (formerly known as CyaSSL)
*
* wolfSSL 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 2 of the License, or
* (at your option) any later version.
*
* wolfSSL 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/* the usual suspects */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/* socket includes */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
/* wolfSSL */
#ifndef WOLFSSL_USER_SETTINGS
#include <wolfssl/options.h>
#endif
#include <wolfssl/ssl.h>
#include <wolfssl/wolfio.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#define DEFAULT_PORT 11111
#define CERT_FILE "../certs/client-cert.pem"
#define KEY_FILE "../certs/client-key.pem"
#define CA_FILE "../certs/ca-cert.pem"
#if defined(WOLFSSL_TLS13) && defined(HAVE_SECRET_CALLBACK)
#ifndef WOLFSSL_SSLKEYLOGFILE_OUTPUT
#define WOLFSSL_SSLKEYLOGFILE_OUTPUT "sslkeylog.log"
#endif
/* Callback function for TLS v1.3 secrets for use with Wireshark */
static int Tls13SecretCallback(WOLFSSL* ssl, int id, const unsigned char* secret,
int secretSz, void* ctx)
{
int i;
const char* str = NULL;
unsigned char clientRandom[32];
int clientRandomSz;
XFILE fp = stderr;
if (ctx) {
fp = XFOPEN((const char*)ctx, "ab");
if (fp == XBADFILE) {
return BAD_FUNC_ARG;
}
}
clientRandomSz = (int)wolfSSL_get_client_random(ssl, clientRandom,
sizeof(clientRandom));
if (clientRandomSz <= 0) {
printf("Error getting client random %d\n", clientRandomSz);
}
#if 0
printf("TLS Client Secret CB: Rand %d, Secret %d\n",
clientRandomSz, secretSz);
#endif
switch (id) {
case CLIENT_EARLY_TRAFFIC_SECRET:
str = "CLIENT_EARLY_TRAFFIC_SECRET"; break;
case EARLY_EXPORTER_SECRET:
str = "EARLY_EXPORTER_SECRET"; break;
case CLIENT_HANDSHAKE_TRAFFIC_SECRET:
str = "CLIENT_HANDSHAKE_TRAFFIC_SECRET"; break;
case SERVER_HANDSHAKE_TRAFFIC_SECRET:
str = "SERVER_HANDSHAKE_TRAFFIC_SECRET"; break;
case CLIENT_TRAFFIC_SECRET:
str = "CLIENT_TRAFFIC_SECRET_0"; break;
case SERVER_TRAFFIC_SECRET:
str = "SERVER_TRAFFIC_SECRET_0"; break;
case EXPORTER_SECRET:
str = "EXPORTER_SECRET"; break;
}
fprintf(fp, "%s ", str);
for (i = 0; i < clientRandomSz; i++) {
fprintf(fp, "%02x", clientRandom[i]);
}
fprintf(fp, " ");
for (i = 0; i < secretSz; i++) {
fprintf(fp, "%02x", secret[i]);
}
fprintf(fp, "\n");
if (fp != stderr) {
XFCLOSE(fp);
}
return 0;
}
#endif /* WOLFSSL_TLS13 && HAVE_SECRET_CALLBACK */
int main(int argc, char** argv)
{
int ret = 0;
#ifdef WOLFSSL_TLS13
int sockfd = SOCKET_INVALID;
struct sockaddr_in servAddr;
char buff[256];
size_t len;
/* declare wolfSSL objects */
WOLFSSL_CTX* ctx = NULL;
WOLFSSL* ssl = NULL;
/* Check for proper calling convention */
if (argc != 2) {
printf("usage: %s <IPv4 address>\n", argv[0]);
return 0;
}
/* Create a socket that uses an internet IPv4 address,
* Sets the socket to be stream based (TCP),
* 0 means choose the default protocol. */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
fprintf(stderr, "ERROR: failed to create the socket\n");
ret = -1; goto exit;
}
/* Initialize the server address struct with zeros */
memset(&servAddr, 0, sizeof(servAddr));
/* Fill in the server address */
servAddr.sin_family = AF_INET; /* using IPv4 */
servAddr.sin_port = htons(DEFAULT_PORT); /* on DEFAULT_PORT */
/* Get the server IPv4 address from the command line call */
if (inet_pton(AF_INET, argv[1], &servAddr.sin_addr) != 1) {
fprintf(stderr, "ERROR: invalid address\n");
ret = -1; goto exit;
}
/* Connect to the server */
if ((ret = connect(sockfd, (struct sockaddr*) &servAddr, sizeof(servAddr)))
== -1) {
fprintf(stderr, "ERROR: failed to connect\n");
goto exit;
}
/*---------------------------------*/
/* Start of wolfSSL initialization and configuration */
/*---------------------------------*/
#if 0
wolfSSL_Debugging_ON();
#endif
/* Initialize wolfSSL */
if ((ret = wolfSSL_Init()) != WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: Failed to initialize the library\n");
goto exit;
}
/* Create and initialize WOLFSSL_CTX */
if ((ctx = wolfSSL_CTX_new(wolfTLSv1_3_client_method())) == NULL) {
fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
ret = -1; goto exit;
}
/* Load client certificate into WOLFSSL_CTX */
if ((ret = wolfSSL_CTX_use_certificate_file(ctx, CERT_FILE, WOLFSSL_FILETYPE_PEM))
!= WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
CERT_FILE);
goto exit;
}
/* Load client key into WOLFSSL_CTX */
if ((ret = wolfSSL_CTX_use_PrivateKey_file(ctx, KEY_FILE, WOLFSSL_FILETYPE_PEM))
!= WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
KEY_FILE);
goto exit;
}
/* Load CA certificate into WOLFSSL_CTX */
if ((ret = wolfSSL_CTX_load_verify_locations(ctx, CA_FILE, NULL))
!= WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
CA_FILE);
goto exit;
}
/* Create a WOLFSSL object */
if ((ssl = wolfSSL_new(ctx)) == NULL) {
fprintf(stderr, "ERROR: failed to create WOLFSSL object\n");
ret = -1; goto exit;
}
/* Attach wolfSSL to the socket */
if ((ret = wolfSSL_set_fd(ssl, sockfd)) != WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: Failed to set the file descriptor\n");
goto exit;
}
#ifdef HAVE_SECRET_CALLBACK
/* required for getting random used */
wolfSSL_KeepArrays(ssl);
/* optional logging for wireshark */
wolfSSL_set_tls13_secret_cb(ssl, Tls13SecretCallback,
(void*)WOLFSSL_SSLKEYLOGFILE_OUTPUT);
#endif
/* Connect to wolfSSL on the server side */
if ((ret = wolfSSL_connect(ssl)) != WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to connect to wolfSSL\n");
goto exit;
}
#ifdef HAVE_SECRET_CALLBACK
wolfSSL_FreeArrays(ssl);
#endif
/* Get a message for the server from stdin */
printf("Message for server: ");
memset(buff, 0, sizeof(buff));
if (fgets(buff, sizeof(buff), stdin) == NULL) {
fprintf(stderr, "ERROR: failed to get message for server\n");
ret = -1; goto exit;
}
len = strnlen(buff, sizeof(buff));
/* Send the message to the server */
if ((ret = wolfSSL_write(ssl, buff, len)) != len) {
fprintf(stderr, "ERROR: failed to write entire message\n");
fprintf(stderr, "%d bytes of %d bytes were sent", ret, (int) len);
goto exit;
}
/* Read the server data into our buff array */
memset(buff, 0, sizeof(buff));
if ((ret = wolfSSL_read(ssl, buff, sizeof(buff)-1)) < 0) {
fprintf(stderr, "ERROR: failed to read\n");
goto exit;
}
/* Print to stdout any data the server sends */
printf("Server: %s\n", buff);
/* Return reporting a success */
ret = 0;
exit:
/* Cleanup and return */
if (sockfd != SOCKET_INVALID)
close(sockfd); /* Close the connection to the server */
if (ssl)
wolfSSL_free(ssl); /* Free the wolfSSL object */
if (ctx)
wolfSSL_CTX_free(ctx); /* Free the wolfSSL context object */
wolfSSL_Cleanup(); /* Cleanup the wolfSSL environment */
#else
printf("Example requires TLS v1.3\n");
#endif
(void)argc;
(void)argv;
return ret;
}
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