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/* server-tls13-certauth-clienthello.c
*
* Copyright (C) 2006-2025 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
*/
/* This example showcases the usage of the TLS 1.3 certificate_authorities
* extension in the ClientHello message, to indicate to the server which
* certificate authorities the client supports, guiding certificate selection.
*
* Example wolfSSL config for this example: ./configure --enable-opensslall
*/
/* 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 */
#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/server-cert.pem"
#define KEY_FILE "../certs/server-key.pem"
#define CA_FILE "../certs/client-cert.pem"
#if !defined(NO_WOLFSSL_CLIENT) && !defined(NO_WOLFSSL_SERVER) && \
!defined(WOLFSSL_NO_CA_NAMES) && !defined(NO_CERTS) && \
defined(WOLFSSL_TLS13) && (defined(OPENSSL_EXTRA) || \
defined(OPENSSL_EXTRA_X509_SMALL)) && (defined(OPENSSL_ALL) || \
defined(WOLFSSL_NGINX) || defined(HAVE_LIGHTY))
static int mSockfd = SOCKET_INVALID;
static int mConnd = SOCKET_INVALID;
static volatile 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
static int cert_setup_callback(WOLFSSL *ssl, void *_arg) {
/* Retrieve the CA names sent by the client */
WOLF_STACK_OF(WOLFSSL_X509_NAME)* names = wolfSSL_get0_peer_CA_list(ssl);
char *certFileName = NULL;
char *keyFileName = NULL;
if (names) {
/* Client sent CA names: read them and try to load a matching
* certificate */
int i;
int num = wolfSSL_sk_X509_NAME_num(names);
printf("CA certificate names received:\n");
for (i = 0; i < num; i++) {
WOLFSSL_X509_NAME* name = wolfSSL_sk_X509_NAME_value(names, i);
char* buf = wolfSSL_X509_NAME_oneline(name, NULL, 0);
printf("\t%s\n", buf);
if (certFileName != NULL && keyFileName != NULL) {
/* Certificate already found */
continue;
}
/* Servers with multiple certificates issued by separate CAs might
* want to check them all and load one issued by a CA that the
* client supports. */
if (strcmp(buf, "/C=US/ST=Montana/L=Bozeman/O=Sawtooth"
"/OU=Consulting/CN=www.wolfssl.com"
"/emailAddress=info@wolfssl.com") == 0) {
certFileName = CERT_FILE;
keyFileName = KEY_FILE;
}
free(buf);
}
if (certFileName == NULL || keyFileName == NULL) {
fprintf(stderr, "ERROR: CA names sent by client do not match any "
"available certificates\n");
return 0;
}
}
else {
/* Client sent no CA names, fall back to default */
certFileName = CERT_FILE;
keyFileName = KEY_FILE;
}
if (wolfSSL_use_certificate_file(ssl, certFileName, SSL_FILETYPE_PEM) !=
WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
certFileName);
return 0;
}
if (wolfSSL_use_PrivateKey_file(ssl, keyFileName, SSL_FILETYPE_PEM) !=
WOLFSSL_SUCCESS) {
fprintf(stderr, "ERROR: failed to load %s, please check the file.\n",
keyFileName);
return 0;
}
return 1;
}
#endif
int main(int argc, char** argv)
{
int ret = 0;
#if !defined(NO_WOLFSSL_CLIENT) && !defined(NO_WOLFSSL_SERVER) && \
!defined(WOLFSSL_NO_CA_NAMES) && !defined(NO_CERTS) && \
defined(WOLFSSL_TLS13) && (defined(OPENSSL_EXTRA) || \
defined(OPENSSL_EXTRA_X509_SMALL)) && (defined(OPENSSL_ALL) || \
defined(WOLFSSL_NGINX) || defined(HAVE_LIGHTY))
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";
int on;
/* declare wolfSSL objects */
WOLFSSL_CTX* ctx = NULL;
WOLFSSL* ssl = NULL;
#ifdef HAVE_SIGNAL
signal(SIGINT, sig_handler);
#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;
setsockopt(mSockfd, SOL_SOCKET, SO_REUSEADDR,
(char*)&on, (socklen_t)sizeof(on));
#ifdef SO_REUSEPORT
setsockopt(mSockfd, SOL_SOCKET, SO_REUSEPORT,
(char*)&on, (socklen_t)sizeof(on));
#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 */
/*---------------------------------*/
/* 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_server_method())) == NULL) {
fprintf(stderr, "ERROR: failed to create WOLFSSL_CTX\n");
ret = -1;
goto exit;
}
/* Require mutual authentication */
wolfSSL_CTX_set_verify(ctx,
WOLFSSL_VERIFY_PEER | WOLFSSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL);
/* Do not load the server's key and certificate in advance. Instead set a
* callback so that they can be selected on demand based on CA names
* received from client.
*/
wolfSSL_CTX_set_cert_cb(ctx, cert_setup_callback, NULL);
/* 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 */
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");
/* 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("Example requires specific wolfSSL features\n");
#endif /* WOLFSSL_TLS13 */
(void)argc;
(void)argv;
return ret;
}
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