364 lines
11 KiB
C
364 lines
11 KiB
C
/* async_server.c
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*
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* Copyright (C) 2006-2023 wolfSSL Inc.
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*
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* This file is part of wolfSSL. (formerly known as CyaSSL)
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/* TLS server demonstrating asynchronous cryptography features and optionally
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* using the crypto or PK callbacks */
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/* std */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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/* socket */
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#define HAVE_SIGNAL
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#ifdef HAVE_SIGNAL
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#include <signal.h> /* for catching ctrl+c */
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#endif
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/* wolfSSL */
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#ifndef WOLFSSL_USER_SETTINGS
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#include <wolfssl/options.h>
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#endif
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#include <wolfssl/ssl.h>
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#include <wolfssl/wolfio.h>
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#include <wolfssl/wolfcrypt/error-crypt.h>
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#include "examples/async/async_tls.h"
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/* Test certificates and keys for RSA and ECC */
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#ifndef NO_RSA
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#define CERT_FILE "./certs/server-cert.pem"
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#define KEY_FILE "./certs/server-key.pem"
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#define CA_FILE "./certs/client-cert.pem"
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#elif defined(HAVE_ECC)
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#define CERT_FILE "./certs/server-ecc.pem"
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#define KEY_FILE "./certs/ecc-key.pem"
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#define CA_FILE "./certs/client-ecc-cert.pem"
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#else
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#error No authentication algorithm (ECC/RSA)
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#endif
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static int mSockfd = SOCKET_INVALID;
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static int mConnd = SOCKET_INVALID;
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static int mShutdown = 0;
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#ifdef HAVE_SIGNAL
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static void sig_handler(const int sig)
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{
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#ifdef DEBUG_WOLFSSL
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fprintf(stderr, "SIGINT handled = %d.\n", sig);
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#else
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(void)sig;
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#endif
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mShutdown = 1;
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if (mConnd != SOCKET_INVALID) {
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close(mConnd); /* Close the connection to the client */
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mConnd = SOCKET_INVALID;
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}
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if (mSockfd != SOCKET_INVALID) {
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close(mSockfd); /* Close the socket listening for clients */
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mSockfd = SOCKET_INVALID;
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}
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}
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#endif
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int server_async_test(int argc, char** argv)
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{
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int ret = 0;
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struct sockaddr_in servAddr;
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struct sockaddr_in clientAddr;
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socklen_t size = sizeof(clientAddr);
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char buff[TEST_BUF_SZ];
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size_t len;
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const char* reply = "I hear ya fa shizzle!\n";
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int on;
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int devId = 1; /* anything besides -2 (INVALID_DEVID) */
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#ifdef WOLF_CRYPTO_CB
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AsyncTlsCryptoCbCtx myCtx;
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#endif
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int err;
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char errBuff[WOLFSSL_MAX_ERROR_SZ];
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/* declare wolfSSL objects */
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WOLFSSL_CTX* ctx = NULL;
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WOLFSSL* ssl = NULL;
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#ifdef HAVE_SIGNAL
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if ((signal(SIGINT, sig_handler)) == SIG_ERR) {
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fprintf(stderr, "ERROR: failed to listen to SIGINT (errno: %d)\n",errno);
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goto exit;
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}
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#endif
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/* Initialize the server address struct with zeros */
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memset(&servAddr, 0, sizeof(servAddr));
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/* Fill in the server address */
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servAddr.sin_family = AF_INET; /* using IPv4 */
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servAddr.sin_port = htons(DEFAULT_PORT); /* on DEFAULT_PORT */
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servAddr.sin_addr.s_addr = INADDR_ANY; /* from anywhere */
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/* Create a socket that uses an internet IPv4 address,
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* Sets the socket to be stream based (TCP),
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* 0 means choose the default protocol. */
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if ((mSockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
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fprintf(stderr, "ERROR: failed to create the socket\n");
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goto exit;
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}
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/* make sure server is setup for reuse addr/port */
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on = 1;
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if (setsockopt(mSockfd, SOL_SOCKET, SO_REUSEADDR,
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(char*)&on, (socklen_t)sizeof(on)) != 0) {
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fprintf(stderr, "ERROR: failed to set SO_REUSEADDR (errno: %d)\n",errno);
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goto exit;
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}
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#ifdef SO_REUSEPORT
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if (setsockopt(mSockfd, SOL_SOCKET, SO_REUSEPORT,
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(char*)&on, (socklen_t)sizeof(on)) != 0) {
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fprintf(stderr, "ERROR: failed to set SO_REUSEPORT (errno: %d)\n",errno);
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goto exit;
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}
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#endif
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/* Bind the server socket to our port */
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if (bind(mSockfd, (struct sockaddr*)&servAddr, sizeof(servAddr)) == -1) {
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fprintf(stderr, "ERROR: failed to bind\n");
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goto exit;
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}
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/* Listen for a new connection, allow 5 pending connections */
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if (listen(mSockfd, 5) == -1) {
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fprintf(stderr, "ERROR: failed to listen\n");
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goto exit;
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}
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/*---------------------------------*/
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/* Start of wolfSSL initialization and configuration */
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/*---------------------------------*/
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#ifdef DEBUG_WOLFSSL
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wolfSSL_Debugging_ON();
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#endif
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/* Initialize wolfSSL */
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if ((ret = wolfSSL_Init()) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "ERROR: Failed to initialize the library\n");
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goto exit;
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}
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/* Create and initialize WOLFSSL_CTX */
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if ((ctx = wolfSSL_CTX_new(wolfSSLv23_server_method())) == NULL) {
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fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
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ret = -1;
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goto exit;
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}
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#ifdef WOLF_CRYPTO_CB
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XMEMSET(&myCtx, 0, sizeof(myCtx));
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/* register a devID for crypto callbacks */
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ret = wc_CryptoCb_RegisterDevice(devId, AsyncTlsCryptoCb, &myCtx);
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if (ret != 0) {
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fprintf(stderr, "wc_CryptoCb_RegisterDevice: error %d", ret);
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goto exit;
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}
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#endif
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/* register a devID for crypto callbacks */
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wolfSSL_CTX_SetDevId(ctx, devId);
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/* Require mutual authentication */
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wolfSSL_CTX_set_verify(ctx,
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WOLFSSL_VERIFY_PEER | WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
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/* Load server certificates into WOLFSSL_CTX */
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if ((ret = wolfSSL_CTX_use_certificate_file(ctx, CERT_FILE,
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WOLFSSL_FILETYPE_PEM)) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
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CERT_FILE);
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goto exit;
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}
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/* Load server key into WOLFSSL_CTX */
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if ((ret = wolfSSL_CTX_use_PrivateKey_file(ctx, KEY_FILE,
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WOLFSSL_FILETYPE_PEM)) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
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KEY_FILE);
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goto exit;
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}
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/* Load client certificate as "trusted" into WOLFSSL_CTX */
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if ((ret = wolfSSL_CTX_load_verify_locations(ctx, CA_FILE, NULL))
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!= WOLFSSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
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CA_FILE);
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goto exit;
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}
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/* Continue to accept clients until mShutdown is issued */
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while (!mShutdown) {
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printf("Waiting for a connection...\n");
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/* Accept client connections */
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if ((mConnd = accept(mSockfd, (struct sockaddr*)&clientAddr, &size))
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== -1) {
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fprintf(stderr, "ERROR: failed to accept the connection\n\n");
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ret = -1; goto exit;
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}
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/* Create a WOLFSSL object */
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if ((ssl = wolfSSL_new(ctx)) == NULL) {
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fprintf(stderr, "ERROR: failed to create WOLFSSL object\n");
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ret = -1; goto exit;
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}
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/* Attach wolfSSL to the socket */
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wolfSSL_set_fd(ssl, mConnd);
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/* Establish TLS connection */
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#ifdef WOLFSSL_ASYNC_CRYPT
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err = 0; /* Reset error */
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#endif
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do {
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#ifdef WOLFSSL_ASYNC_CRYPT
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if (err == WC_PENDING_E) {
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ret = wolfSSL_AsyncPoll(ssl, WOLF_POLL_FLAG_CHECK_HW);
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if (ret < 0)
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break;
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}
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#endif
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ret = wolfSSL_accept(ssl);
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err = wolfSSL_get_error(ssl, 0);
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} while (err == WC_PENDING_E);
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if (ret != WOLFSSL_SUCCESS) {
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fprintf(stderr, "wolfSSL_accept error %d: %s\n",
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err, wolfSSL_ERR_error_string(err, errBuff));
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goto exit;
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}
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printf("Client connected successfully\n");
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/* Read the client data into our buff array */
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memset(buff, 0, sizeof(buff));
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#ifdef WOLFSSL_ASYNC_CRYPT
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err = 0; /* Reset error */
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#endif
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do {
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#ifdef WOLFSSL_ASYNC_CRYPT
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if (err == WC_PENDING_E) {
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ret = wolfSSL_AsyncPoll(ssl, WOLF_POLL_FLAG_CHECK_HW);
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if (ret < 0)
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break;
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}
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#endif
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ret = wolfSSL_read(ssl, buff, sizeof(buff)-1);
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err = wolfSSL_get_error(ssl, 0);
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} while (err == WC_PENDING_E);
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if (ret < 0) {
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fprintf(stderr, "wolfSSL_read error %d: %s\n",
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err, wolfSSL_ERR_error_string(err, errBuff));
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goto exit;
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}
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/* Print to stdout any data the client sends */
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printf("Client: %s\n", buff);
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/* Check for server shutdown command */
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if (strncmp(buff, "shutdown", 8) == 0) {
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printf("Shutdown command issued!\n");
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mShutdown = 1;
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}
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/* Write our reply into buff */
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memset(buff, 0, sizeof(buff));
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memcpy(buff, reply, strlen(reply));
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len = strnlen(buff, sizeof(buff));
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/* Reply back to the client */
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#ifdef WOLFSSL_ASYNC_CRYPT
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err = 0; /* Reset error */
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#endif
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do {
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#ifdef WOLFSSL_ASYNC_CRYPT
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if (err == WC_PENDING_E) {
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ret = wolfSSL_AsyncPoll(ssl, WOLF_POLL_FLAG_CHECK_HW);
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if (ret < 0)
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break;
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}
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#endif
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ret = wolfSSL_write(ssl, buff, (int)len);
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err = wolfSSL_get_error(ssl, 0);
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} while (err == WC_PENDING_E);
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if (ret != (int)len) {
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fprintf(stderr, "wolfSSL_write error %d: %s\n",
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err, wolfSSL_ERR_error_string(err, errBuff));
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goto exit;
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}
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/* Cleanup after this connection */
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wolfSSL_shutdown(ssl);
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if (ssl) {
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wolfSSL_free(ssl); /* Free the wolfSSL object */
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ssl = NULL;
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}
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if (mConnd != SOCKET_INVALID) {
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close(mConnd); /* Close the connection to the client */
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mConnd = SOCKET_INVALID;
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}
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}
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printf("Shutdown complete\n");
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exit:
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/* Cleanup and return */
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if (ssl)
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wolfSSL_free(ssl); /* Free the wolfSSL object */
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if (mConnd != SOCKET_INVALID) {
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close(mConnd); /* Close the connection to the client */
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mConnd = SOCKET_INVALID;
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}
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if (mSockfd != SOCKET_INVALID) {
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close(mSockfd); /* Close the socket listening for clients */
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mSockfd = SOCKET_INVALID;
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}
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if (ctx)
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wolfSSL_CTX_free(ctx); /* Free the wolfSSL context object */
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wolfSSL_Cleanup(); /* Cleanup the wolfSSL environment */
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(void)argc;
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(void)argv;
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return ret;
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}
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#ifndef NO_MAIN_DRIVER
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int main(int argc, char** argv)
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{
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return server_async_test(argc, argv);
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}
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#endif /* !NO_MAIN_DRIVER */
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