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wolfssl-examples/pq/tls/server-pq-tls13.c

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/* server-pq-tls13.c
*
* Copyright (C) 2021 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>
#define HAVE_SIGNAL
#ifdef HAVE_SIGNAL
#include <signal.h> /* signal */
#endif
/* wolfSSL */
#include <wolfssl/options.h>
#include <wolfssl/ssl.h>
#include <wolfssl/wolfio.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#if defined(WOLFSSL_TLS13) && defined(WOLFSSL_HAVE_KYBER) && \
defined(HAVE_DILITHIUM)
#define DEFAULT_PORT 11111
#define CERT_FILE "../../certs/mldsa87_entity_cert.pem"
#define KEY_FILE "../../certs/mldsa87_entity_key.pem"
#ifdef 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 serverRandom[32];
int serverRandomSz;
XFILE fp = stderr;
if (ctx) {
fp = XFOPEN((const char*)ctx, "ab");
if (fp == XBADFILE) {
return BAD_FUNC_ARG;
}
}
serverRandomSz = (int)wolfSSL_get_server_random(ssl, serverRandom,
sizeof(serverRandom));
if (serverRandomSz <= 0) {
printf("Error getting server random %d\n", serverRandomSz);
}
#if 0
printf("TLS Server Secret CB: Rand %d, Secret %d\n",
serverRandomSz, 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 < (int)serverRandomSz; i++) {
fprintf(fp, "%02x", serverRandom[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 /* HAVE_SECRET_CALLBACK */
static int mSockfd = SOCKET_INVALID;
static int mConnd = SOCKET_INVALID;
static int mShutdown = 0;
#ifdef HAVE_SIGNAL
static void sig_handler(const int sig)
{
fprintf(stderr, "SIGINT handled = %d.\n", sig);
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 /* HAVE_SIGNAL */
#endif /* WOLFSSL_TLS13 && WOLFSSL_HAVE_KYBER && HAVE_DILITHIUM */
int main(int argc, char** argv)
{
int ret = 0;
#if defined(WOLFSSL_TLS13) && defined(WOLFSSL_HAVE_KYBER) && \
defined(HAVE_DILITHIUM)
struct sockaddr_in servAddr;
struct sockaddr_in clientAddr;
socklen_t size = sizeof(clientAddr);
char buff[256];
size_t len;
const char* reply = "I hear ya fa shizzle!\n";
/* declare wolfSSL objects */
WOLFSSL_CTX* ctx = NULL;
WOLFSSL* ssl = NULL;
char *cert_file = CERT_FILE;
char *key_file = KEY_FILE;
#ifdef HAVE_SIGNAL
signal(SIGINT, sig_handler);
#endif
if(argc == 3) {
cert_file = argv[1];
key_file = argv[2];
} else if (argc != 1) {
printf("usage: %s <IPv4 address> [<cert file> <key file>]\n", argv[0]);
printf("Default cert file: %s, key file: %s\n", cert_file, key_file);
return 0;
}
/* Initialize wolfSSL */
wolfSSL_Init();
/* 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;
}
/* Create and initialize WOLFSSL_CTX */
if ((ctx = wolfSSL_CTX_new(wolfTLSv1_3_server_method())) == NULL) {
fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
ret = -1;
goto exit;
}
/* 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;
}
/* 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 */
/* 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;
}
/* 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;
}
ret = wolfSSL_UseKeyShare(ssl, WOLFSSL_P521_ML_KEM_1024);
if (ret < 0) {
fprintf(stderr, "ERROR: failed to set the requested group to "
"WOLFSSL_P521_ML_KEM_1024.\n");
ret = -1; goto exit;
}
/* Attach wolfSSL to the socket */
wolfSSL_set_fd(ssl, mConnd);
#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
/* Establish TLS connection */
if ((ret = wolfSSL_accept(ssl)) != WOLFSSL_SUCCESS) {
fprintf(stderr, "wolfSSL_accept error = %d\n",
wolfSSL_get_error(ssl, ret));
goto exit;
}
printf("Client connected successfully\n");
#ifdef HAVE_SECRET_CALLBACK
wolfSSL_FreeArrays(ssl);
#endif
/* Read the client 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 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 */
if ((ret = wolfSSL_write(ssl, buff, len)) != len) {
fprintf(stderr, "ERROR: failed to write\n");
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 */
#else
printf("This requires TLS 1.3, ML-DSA (Dilithium) and ML-KEM (Kyber).\n");
printf("Configure wolfssl like this:\n");
printf(" ./configure --enable-dilithium --enable-kyber\n");
#endif /* WOLFSSL_TLS13 && WOLFSSL_HAVE_KYBER && HAVE_DILITHIUM */
(void)argc;
(void)argv;
return ret;
}
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