/* async_server.c
*
* Copyright (C) 2006-2023 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
*/
/* TLS server demonstrating asynchronous cryptography features and optionally
* using the crypto or PK callbacks */
/* std */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/* socket */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
#define HAVE_SIGNAL
#ifdef HAVE_SIGNAL
#include <signal.h> /* for catching ctrl+c */
#endif
/* wolfSSL */
#ifndef WOLFSSL_USER_SETTINGS
#include <wolfssl/options.h>
#endif
#include <wolfssl/ssl.h>
#include <wolfssl/wolfio.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#include "examples/async/async_tls.h"
/* Test certificates and keys for RSA and ECC */
#ifndef NO_RSA
#define CERT_FILE "./certs/server-cert.pem"
#define KEY_FILE "./certs/server-key.pem"
#define CA_FILE "./certs/client-cert.pem"
#elif defined(HAVE_ECC)
#define CERT_FILE "./certs/server-ecc.pem"
#define KEY_FILE "./certs/ecc-key.pem"
#define CA_FILE "./certs/client-ecc-cert.pem"
#else
#error No authentication algorithm (ECC/RSA)
#endif
static int mSockfd = SOCKET_INVALID;
static int mConnd = SOCKET_INVALID;
static int mShutdown = 0;
#ifdef HAVE_SIGNAL
static void sig_handler(const int sig)
{
#ifdef DEBUG_WOLFSSL
fprintf(stderr, "SIGINT handled = %d.\n", sig);
#else
(void)sig;
#endif
mShutdown = 1;
if (mConnd != SOCKET_INVALID) {
close(mConnd); /* Close the connection to the client */
mConnd = SOCKET_INVALID;
}
if (mSockfd != SOCKET_INVALID) {
close(mSockfd); /* Close the socket listening for clients */
mSockfd = SOCKET_INVALID;
}
}
#endif
int server_async_test(int argc, char** argv)
{
int ret = 0;
struct sockaddr_in servAddr;
struct sockaddr_in clientAddr;
socklen_t size = sizeof(clientAddr);
char buff[TEST_BUF_SZ];
size_t len;
const char* reply = "I hear ya fa shizzle!\n";
int on;
int devId = 1; /* anything besides -2 (INVALID_DEVID) */
#ifdef WOLF_CRYPTO_CB
AsyncTlsCryptoCbCtx myCtx;
#endif
int err;
char errBuff[WOLFSSL_MAX_ERROR_SZ];
/* declare wolfSSL objects */
WOLFSSL_CTX* ctx = NULL;
WOLFSSL* ssl = NULL;
#ifdef HAVE_SIGNAL
if ((signal(SIGINT, sig_handler)) == SIG_ERR) {
fprintf(stderr, "ERROR: failed to listen to SIGINT (errno: %d)\n",errno);
goto exit;
}
#endif
/* 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 */
servAddr.sin_addr.s_addr = INADDR_ANY; /* from anywhere */
/* Create a socket that uses an internet IPv4 address,
* Sets the socket to be stream based (TCP),
* 0 means choose the default protocol. */
if ((mSockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
fprintf(stderr, "ERROR: failed to create the socket\n");
goto exit;
}
/* make sure server is setup for reuse addr/port */
on = 1;
if (setsockopt(mSockfd, SOL_SOCKET, SO_REUSEADDR,
(char*)&on, (socklen_t)sizeof(on)) != 0) {
fprintf(stderr, "ERROR: failed to set SO_REUSEADDR (errno: %d)\n",errno);
goto exit;
}
#ifdef SO_REUSEPORT
if (setsockopt(mSockfd, SOL_SOCKET, SO_REUSEPORT,
(char*)&on, (socklen_t)sizeof(on)) != 0) {
fprintf(stderr, "ERROR: failed to set SO_REUSEPORT (errno: %d)\n",errno);
goto exit;
}
#endif
/* Bind the server socket to our port */
if (bind(mSockfd, (struct sockaddr*)&servAddr, sizeof(servAddr)) == -1) {
fprintf(stderr, "ERROR: failed to bind\n");
goto exit;
}
/* Listen for a new connection, allow 5 pending connections */
if (listen(mSockfd, 5) == -1) {
fprintf(stderr, "ERROR: failed to listen\n");
goto exit;
}
/*---------------------------------*/
/* Start of wolfSSL initialization and configuration */
/*---------------------------------*/
#ifdef DEBUG_WOLFSSL
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(wolfSSLv23_server_method())) == NULL) {
fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
ret = -1;
goto exit;
}
#ifdef WOLF_CRYPTO_CB
XMEMSET(&myCtx, 0, sizeof(myCtx));
/* register a devID for crypto callbacks */
ret = wc_CryptoCb_RegisterDevice(devId, AsyncTlsCryptoCb, &myCtx);
if (ret != 0) {
fprintf(stderr, "wc_CryptoCb_RegisterDevice: error %d", ret);
goto exit;
}
#endif
/* register a devID for crypto callbacks */
wolfSSL_CTX_SetDevId(ctx, devId);
/* Require mutual authentication */
wolfSSL_CTX_set_verify(ctx,
WOLFSSL_VERIFY_PEER | WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
/* Load server certificates 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 server 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 client certificate as "trusted" 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;
}
/* Continue to accept clients until mShutdown is issued */
while (!mShutdown) {
printf("Waiting for a connection...\n");
/* Accept client connections */
if ((mConnd = accept(mSockfd, (struct sockaddr*)&clientAddr, &size))
== -1) {
fprintf(stderr, "ERROR: failed to accept the connection\n\n");
ret = -1; 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 */
wolfSSL_set_fd(ssl, mConnd);
/* Establish TLS connection */
#ifdef WOLFSSL_ASYNC_CRYPT
err = 0; /* Reset error */
#endif
do {
#ifdef WOLFSSL_ASYNC_CRYPT
if (err == WC_PENDING_E) {
ret = wolfSSL_AsyncPoll(ssl, WOLF_POLL_FLAG_CHECK_HW);
if (ret < 0)
break;
}
#endif
ret = wolfSSL_accept(ssl);
err = wolfSSL_get_error(ssl, 0);
} while (err == WC_PENDING_E);
if (ret != WOLFSSL_SUCCESS) {
fprintf(stderr, "wolfSSL_accept error %d: %s\n",
err, wolfSSL_ERR_error_string(err, errBuff));
goto exit;
}
printf("Client connected successfully\n");
/* Read the client data into our buff array */
memset(buff, 0, sizeof(buff));
#ifdef WOLFSSL_ASYNC_CRYPT
err = 0; /* Reset error */
#endif
do {
#ifdef WOLFSSL_ASYNC_CRYPT
if (err == WC_PENDING_E) {
ret = wolfSSL_AsyncPoll(ssl, WOLF_POLL_FLAG_CHECK_HW);
if (ret < 0)
break;
}
#endif
ret = wolfSSL_read(ssl, buff, sizeof(buff)-1);
err = wolfSSL_get_error(ssl, 0);
} while (err == WC_PENDING_E);
if (ret < 0) {
fprintf(stderr, "wolfSSL_read error %d: %s\n",
err, wolfSSL_ERR_error_string(err, errBuff));
goto exit;
}
/* Print to stdout any data the client sends */
printf("Client: %s\n", buff);
/* Check for server shutdown command */
if (strncmp(buff, "shutdown", 8) == 0) {
printf("Shutdown command issued!\n");
mShutdown = 1;
}
/* Write our reply into buff */
memset(buff, 0, sizeof(buff));
memcpy(buff, reply, strlen(reply));
len = strnlen(buff, sizeof(buff));
/* Reply back to the client */
#ifdef WOLFSSL_ASYNC_CRYPT
err = 0; /* Reset error */
#endif
do {
#ifdef WOLFSSL_ASYNC_CRYPT
if (err == WC_PENDING_E) {
ret = wolfSSL_AsyncPoll(ssl, WOLF_POLL_FLAG_CHECK_HW);
if (ret < 0)
break;
}
#endif
ret = wolfSSL_write(ssl, buff, (int)len);
err = wolfSSL_get_error(ssl, 0);
} while (err == WC_PENDING_E);
if (ret != (int)len) {
fprintf(stderr, "wolfSSL_write error %d: %s\n",
err, wolfSSL_ERR_error_string(err, errBuff));
goto exit;
}
/* Cleanup after this connection */
wolfSSL_shutdown(ssl);
if (ssl) {
wolfSSL_free(ssl); /* Free the wolfSSL object */
ssl = NULL;
}
if (mConnd != SOCKET_INVALID) {
close(mConnd); /* Close the connection to the client */
mConnd = SOCKET_INVALID;
}
}
printf("Shutdown complete\n");
exit:
/* Cleanup and return */
if (ssl)
wolfSSL_free(ssl); /* Free the wolfSSL object */
if (mConnd != SOCKET_INVALID) {
close(mConnd); /* Close the connection to the client */
mConnd = SOCKET_INVALID;
}
if (mSockfd != SOCKET_INVALID) {
close(mSockfd); /* Close the socket listening for clients */
mSockfd = SOCKET_INVALID;
}
if (ctx)
wolfSSL_CTX_free(ctx); /* Free the wolfSSL context object */
wolfSSL_Cleanup(); /* Cleanup the wolfSSL environment */
(void)argc;
(void)argv;
return ret;
}
#ifndef NO_MAIN_DRIVER
int main(int argc, char** argv)
{
return server_async_test(argc, argv);
}
#endif /* !NO_MAIN_DRIVER */