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wolfssl-examples/embedded/tls-client-server.c

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/* tls-client-server.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
*/
#ifndef WOLFSSL_USER_SETTINGS
#include <wolfssl/options.h>
#endif
#include <wolfssl/wolfcrypt/settings.h>
#include <wolfssl/ssl.h>
#include "certs.h"
#if !defined(NO_WOLFSSL_CLIENT) && !defined(NO_WOLFSSL_SERVER)
/* I/O buffer size - wolfSSL buffers messages internally as well. */
#define BUFFER_SIZE 2048
/* Size of static buffer for dynamic memory allocation. */
#ifdef WOLFSSL_STATIC_MEMORY_SMALL
#define STATIC_MEM_SIZE (24*1024)
#elif defined(HAVE_ECC)
#define STATIC_MEM_SIZE (144*1024)
#else
#define STATIC_MEM_SIZE (96*1024)
#endif
#ifdef WOLFSSL_STATIC_MEMORY
/* Hint pointers for dynamic memory allocating from buffer. */
static WOLFSSL_HEAP_HINT* HEAP_HINT_SERVER;
static WOLFSSL_HEAP_HINT* HEAP_HINT_CLIENT;
/* Static buffers to dynamically allocate from. */
static byte gTestMemoryServer[STATIC_MEM_SIZE];
static byte gTestMemoryClient[STATIC_MEM_SIZE];
#else
#define HEAP_HINT_SERVER NULL
#define HEAP_HINT_CLIENT NULL
#endif /* WOLFSSL_STATIC_MEMORY */
/* Buffer for client connection to allocate dynamic memory from. */
static unsigned char client_buffer[BUFFER_SIZE];
static int client_buffer_sz = 0;
/* Buffer for server connection to allocate dynamic memory from. */
static unsigned char server_buffer[BUFFER_SIZE];
static int server_buffer_sz = 0;
/* Application data to send. */
static const char msgHTTPGet[] = "GET /index.html HTTP/1.0\r\n\r\n";
static const char msgHTTPIndex[] =
"HTTP/1.1 200 OK\n"
"Content-Type: text/html\n"
"Connection: close\n"
"\n"
"<html>\n"
"<head>\n"
"<title>Welcome to wolfSSL!</title>\n"
"</head>\n"
"<body>\n"
"<p>wolfSSL has successfully performed handshake!</p>\n"
"</body>\n"
"</html>\n";
/* Client attempts to read data from server. */
static int recv_client(WOLFSSL* ssl, char* buff, int sz, void* ctx)
{
if (client_buffer_sz > 0) {
if (sz > client_buffer_sz)
sz = client_buffer_sz;
XMEMCPY(buff, client_buffer, sz);
if (sz < client_buffer_sz) {
XMEMMOVE(client_buffer, client_buffer + sz, client_buffer_sz - sz);
}
client_buffer_sz -= sz;
}
else
sz = WOLFSSL_CBIO_ERR_WANT_READ;
return sz;
}
/* Client attempts to write data to server. */
static int send_client(WOLFSSL* ssl, char* buff, int sz, void* ctx)
{
if (server_buffer_sz < BUFFER_SIZE)
{
if (sz > BUFFER_SIZE - server_buffer_sz)
sz = BUFFER_SIZE - server_buffer_sz;
XMEMCPY(server_buffer + server_buffer_sz, buff, sz);
server_buffer_sz += sz;
}
else
sz = WOLFSSL_CBIO_ERR_WANT_WRITE;
return sz;
}
/* Server attempts to read data from client. */
static int recv_server(WOLFSSL* ssl, char* buff, int sz, void* ctx)
{
if (server_buffer_sz > 0) {
if (sz > server_buffer_sz)
sz = server_buffer_sz;
XMEMCPY(buff, server_buffer, sz);
if (sz < server_buffer_sz) {
XMEMMOVE(server_buffer, server_buffer + sz, server_buffer_sz - sz);
}
server_buffer_sz -= sz;
}
else
sz = WOLFSSL_CBIO_ERR_WANT_READ;
return sz;
}
/* Server attempts to write data to client. */
static int send_server(WOLFSSL* ssl, char* buff, int sz, void* ctx)
{
if (client_buffer_sz < BUFFER_SIZE)
{
if (sz > BUFFER_SIZE - client_buffer_sz)
sz = BUFFER_SIZE - client_buffer_sz;
XMEMCPY(client_buffer + client_buffer_sz, buff, sz);
client_buffer_sz += sz;
}
else
sz = WOLFSSL_CBIO_ERR_WANT_WRITE;
return sz;
}
/* Create a new wolfSSL client with a server CA certificate. */
static int wolfssl_client_new(WOLFSSL_CTX** ctx, WOLFSSL** ssl)
{
int ret = 0;
WOLFSSL_CTX* client_ctx = NULL;
WOLFSSL* client_ssl = NULL;
/* Create and initialize WOLFSSL_CTX */
if ((client_ctx = wolfSSL_CTX_new_ex(wolfTLSv1_2_client_method(),
HEAP_HINT_CLIENT)) == NULL) {
printf("ERROR: failed to create WOLFSSL_CTX\n");
ret = -1;
}
if (ret == 0) {
/* Load CA certificates into WOLFSSL_CTX */
if (wolfSSL_CTX_load_verify_buffer(client_ctx, CA_CERTS, CA_CERTS_LEN,
WOLFSSL_FILETYPE_ASN1) != WOLFSSL_SUCCESS) {
printf("ERROR: failed to load CA certificate\n");
ret = -1;
}
}
if (ret == 0) {
/* Register callbacks */
wolfSSL_SetIORecv(client_ctx, recv_client);
wolfSSL_SetIOSend(client_ctx, send_client);
}
if (ret == 0) {
/* Create a WOLFSSL object */
if ((client_ssl = wolfSSL_new(client_ctx)) == NULL) {
printf("ERROR: failed to create WOLFSSL object\n");
ret = -1;
}
}
if (ret == 0) {
*ctx = client_ctx;
*ssl = client_ssl;
}
else {
if (client_ssl != NULL)
wolfSSL_free(client_ssl);
if (client_ctx != NULL)
wolfSSL_CTX_free(client_ctx);
}
return ret;
}
/* Client connecting to server using TLS */
static int wolfssl_client_connect(WOLFSSL* client_ssl)
{
int ret = 0;
if (wolfSSL_connect(client_ssl) != WOLFSSL_SUCCESS) {
if (wolfSSL_want_read(client_ssl)) {
printf("Client waiting for server\n");
}
else if (wolfSSL_want_write(client_ssl)) {
printf("Client waiting for buffer\n");
}
else
ret = -1;
}
return ret;
}
/* Create a new wolfSSL server with a certificate for authentication. */
static int wolfssl_server_new(WOLFSSL_CTX** ctx, WOLFSSL** ssl)
{
int ret = 0;
WOLFSSL_CTX* server_ctx = NULL;
WOLFSSL* server_ssl = NULL;
/* Create and initialize WOLFSSL_CTX */
if ((server_ctx = wolfSSL_CTX_new_ex(wolfTLSv1_2_server_method(),
HEAP_HINT_SERVER)) == NULL) {
printf("ERROR: failed to create WOLFSSL_CTX\n");
ret = -1;
}
if (ret == 0) {
/* Load client certificates into WOLFSSL_CTX */
if (wolfSSL_CTX_use_certificate_buffer(server_ctx, SERVER_CERT,
SERVER_CERT_LEN, WOLFSSL_FILETYPE_ASN1) != WOLFSSL_SUCCESS) {
printf("ERROR: failed to load server certificate\n");
ret = -1;
}
}
if (ret == 0) {
/* Load client certificates into WOLFSSL_CTX */
if (wolfSSL_CTX_use_PrivateKey_buffer(server_ctx,
SERVER_KEY, SERVER_KEY_LEN, WOLFSSL_FILETYPE_ASN1) !=
WOLFSSL_SUCCESS) {
printf("ERROR: failed to load server key\n");
ret = -1;
}
}
if (ret == 0) {
/* Register callbacks */
wolfSSL_SetIORecv(server_ctx, recv_server);
wolfSSL_SetIOSend(server_ctx, send_server);
}
if (ret == 0) {
/* Create a WOLFSSL object */
if ((server_ssl = wolfSSL_new(server_ctx)) == NULL) {
printf("ERROR: failed to create WOLFSSL object\n");
ret = -1;
}
}
if (ret == 0) {
*ctx = server_ctx;
*ssl = server_ssl;
}
else {
if (server_ssl != NULL)
wolfSSL_free(server_ssl);
if (server_ctx != NULL)
wolfSSL_CTX_free(server_ctx);
}
return ret;
}
/* Server accepting a client using TLS */
static int wolfssl_server_accept(WOLFSSL* server_ssl)
{
int ret = 0;
if (wolfSSL_accept(server_ssl) != WOLFSSL_SUCCESS) {
if (wolfSSL_want_read(server_ssl)) {
printf("Server waiting for server\n");
}
else if (wolfSSL_want_write(server_ssl)) {
printf("Server waiting for buffer\n");
}
else
ret = -1;
}
return ret;
}
/* Send application data. */
static int wolfssl_send(WOLFSSL* ssl, const char* msg)
{
int ret;
printf("%s", msg);
ret = wolfSSL_write(ssl, msg, XSTRLEN(msg));
if (ret < XSTRLEN(msg))
ret = -1;
else
ret = 0;
return ret;
}
/* Receive application data. */
static int wolfssl_recv(WOLFSSL* ssl)
{
int ret;
byte reply[256];
ret = wolfSSL_read(ssl, reply, sizeof(reply)-1);
if (ret > 0) {
reply[ret] = '\0';
printf("%s", reply);
ret = 0;
}
return ret;
}
/* Free the WOLFSSL object and context. */
static void wolfssl_free(WOLFSSL_CTX* ctx, WOLFSSL* ssl)
{
if (ssl != NULL)
wolfSSL_free(ssl);
if (ctx != NULL)
wolfSSL_CTX_free(ctx);
}
/* Display dynamic memory usage statistics. */
static void wolfssl_memstats(WOLFSSL* ssl)
{
#ifdef WOLFSSL_STATIC_MEMORY
WOLFSSL_MEM_CONN_STATS ssl_stats;
XMEMSET(&ssl_stats, 0 , sizeof(ssl_stats));
if (wolfSSL_is_static_memory(ssl, &ssl_stats) != 1)
printf("static memory was not used with ssl");
else {
printf("*** This is memory state before wolfSSL_free is called\n");
printf("peak connection memory = %d\n", ssl_stats.peakMem);
printf("current memory in use = %d\n", ssl_stats.curMem);
printf("peak connection allocs = %d\n", ssl_stats.peakAlloc);
printf("current connection allocs = %d\n",ssl_stats.curAlloc);
printf("total connection allocs = %d\n",ssl_stats.totalAlloc);
printf("total connection frees = %d\n\n", ssl_stats.totalFr);
}
#endif
}
/* Display dynamic memory usage statistics of the client connection. */
static void wolfssl_client_memstats(WOLFSSL* client_ssl)
{
#ifdef WOLFSSL_STATIC_MEMORY
printf("Client Memory Stats\n");
#endif
wolfssl_memstats(client_ssl);
}
/* Display dynamic memory usage statistics of the server connection. */
static void wolfssl_server_memstats(WOLFSSL* server_ssl)
{
#ifdef WOLFSSL_STATIC_MEMORY
printf("Server Memory Stats\n");
#endif
wolfssl_memstats(server_ssl);
}
/* Main entry point. */
int main(int argc, char* argv[])
{
int ret = 0;
WOLFSSL_CTX* client_ctx = NULL;
WOLFSSL* client_ssl = NULL;
WOLFSSL_CTX* server_ctx = NULL;
WOLFSSL* server_ssl = NULL;
#if defined(DEBUG_WOLFSSL)
wolfSSL_Debugging_ON();
#endif
/* Initialize wolfSSL library. */
wolfSSL_Init();
#ifdef WOLFSSL_STATIC_MEMORY
if (wc_LoadStaticMemory(&HEAP_HINT_SERVER, gTestMemoryServer,
sizeof(gTestMemoryServer),
WOLFMEM_GENERAL | WOLFMEM_TRACK_STATS, 1) != 0) {
printf("unable to load static memory");
ret = -1;
}
if (wc_LoadStaticMemory(&HEAP_HINT_CLIENT, gTestMemoryClient,
sizeof(gTestMemoryClient),
WOLFMEM_GENERAL | WOLFMEM_TRACK_STATS, 1) != 0) {
printf("unable to load static memory");
ret = -1;
}
#endif
/* Create server and client SSL objects. */
if (ret == 0)
ret = wolfssl_server_new(&server_ctx, &server_ssl);
if (ret == 0)
ret = wolfssl_client_new(&client_ctx, &client_ssl);
/* Loop to perform SSL handshake. */
while (ret == 0) {
ret = wolfssl_client_connect(client_ssl);
if (ret == 0)
ret = wolfssl_server_accept(server_ssl);
if (ret == 0 && wolfSSL_is_init_finished(client_ssl) &&
wolfSSL_is_init_finished(server_ssl)) {
break;
}
}
if (ret == 0)
printf("Handshake complete\n");
/* Send and receive HTTP messages. */
if (ret == 0) {
printf("\nClient Sending:\n");
ret = wolfssl_send(client_ssl, msgHTTPGet);
}
if (ret == 0) {
printf("\nServer Received:\n");
ret = wolfssl_recv(server_ssl);
}
if (ret == 0) {
printf("\nServer Sending:\n");
ret = wolfssl_send(server_ssl, msgHTTPIndex);
}
if (ret == 0) {
printf("\nClient Received:\n");
ret = wolfssl_recv(client_ssl);
}
/* Display memory statistics. */
wolfssl_client_memstats(client_ssl);
wolfssl_server_memstats(server_ssl);
/* Dispose of SSL objects. */
wolfssl_free(client_ctx, client_ssl);
wolfssl_free(server_ctx, server_ssl);
/* Cleanup wolfSSL library. */
wolfSSL_Cleanup();
if (ret == 0)
printf("Done\n");
else {
char buffer[80];
printf("Error: %d, %s\n", ret, wolfSSL_ERR_error_string(ret, buffer));
}
return (ret == 0) ? 0 : 1;
}
#else
int main(int argc, char* argv[])
{
(void)argc;
(void)argv;
printf("Must build wolfSSL with client and server enabled for this example\n");
return 0;
}
#endif
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