267 lines
7.8 KiB
C
267 lines
7.8 KiB
C
/* client-tls.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.
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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 02110-1335, USA
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*/
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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 includes */
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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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/* wolfSSL */
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#include <wolfssl/options.h>
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#include <wolfssl/ssl.h>
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/* malloc out buffer and fill it with converted DER to PEM
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* returns pem size on success
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*/
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static int convertDerToPem(int type, char* file, unsigned char **out)
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{
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int derSz, pemSz;
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unsigned char der[4096];
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unsigned char *pem;
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FILE* f;
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f = fopen(file, "rb");
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if (f == NULL) {
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fprintf(stderr, "unable to open cert file %s\n", file);
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return -1;
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}
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derSz = fread(der, 1, sizeof(der), f);
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fclose(f);
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pemSz = wc_DerToPemEx(der, derSz, NULL, 0, NULL, type);
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if (pemSz <= 0) {
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fprintf(stderr, "issue getting pem size needed\n");
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return -1;
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}
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pem = (unsigned char*)malloc(pemSz);
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if (pem == NULL) {
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fprintf(stderr, "issue malloc'ing pem size needed\n");
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return -1;
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}
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pemSz = wc_DerToPemEx(der, derSz, pem, pemSz, NULL, type);
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if (pemSz <= 0) {
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fprintf(stderr, "issue %d converting der to pem\n", pemSz);
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free(pem);
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return -1;
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}
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*out = pem;
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return pemSz;
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}
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int main(int argc, char** argv)
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{
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int sockfd;
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struct sockaddr_in servAddr;
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char buff[256];
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size_t len;
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int ret;
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int port;
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int pemSz;
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unsigned char *pem;
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FILE* f;
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/* declare wolfSSL objects */
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WOLFSSL_CTX* ctx;
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WOLFSSL* ssl;
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/* Check for proper calling convention */
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if (argc != 6) {
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printf("usage: %s <port> <IPv4 address> <CA PEM> <cert DER> <key DER>\n",
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argv[0]);
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return 0;
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}
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port = atoi(argv[1]);
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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 ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
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fprintf(stderr, "ERROR: failed to create the socket\n");
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ret = -1;
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goto end;
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}
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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(port); /* on DEFAULT_PORT */
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/* Get the server IPv4 address from the command line call */
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if (inet_pton(AF_INET, argv[2], &servAddr.sin_addr) != 1) {
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fprintf(stderr, "ERROR: invalid address\n");
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ret = -1;
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goto end;
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}
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/* Connect to the server */
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if ((ret = connect(sockfd, (struct sockaddr*) &servAddr, sizeof(servAddr)))
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== -1) {
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fprintf(stderr, "ERROR: failed to connect\n");
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goto end;
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}
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/*---------------------------------*/
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/* Start of security */
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/*---------------------------------*/
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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 socket_cleanup;
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}
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/* Create and initialize WOLFSSL_CTX */
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if ((ctx = wolfSSL_CTX_new(wolfSSLv23_client_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 socket_cleanup;
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}
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/* load cert and convert DER to PEM using dynamic length */
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pemSz = convertDerToPem(CERT_TYPE, argv[4], &pem);
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if (pemSz <= 0) {
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fprintf(stderr, "ERROR: converting DER cert to PEM\n");
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ret = -1;
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goto socket_cleanup;
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}
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if (wolfSSL_CTX_use_certificate_buffer(ctx, pem, pemSz,
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WOLFSSL_FILETYPE_PEM) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "issue loading in pem cert\n");
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ret = -1;
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free(pem);
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goto socket_cleanup;
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}
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free(pem);
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/* load key and convert DER to PEM using dynamic length */
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pemSz = convertDerToPem(PRIVATEKEY_TYPE, argv[5], &pem);
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if (pemSz <= 0) {
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fprintf(stderr, "ERROR: converting DER key to PEM\n");
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ret = -1;
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goto socket_cleanup;
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}
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if (wolfSSL_CTX_use_PrivateKey_buffer(ctx, pem, pemSz,
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WOLFSSL_FILETYPE_PEM) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "issue loading in pem key\n");
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ret = -1;
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free(pem);
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goto socket_cleanup;
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}
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free(pem);
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/* Load client certificates into WOLFSSL_CTX */
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f = fopen(argv[3], "rb");
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if (f == NULL) {
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fprintf(stderr, "unable to open %s\n", argv[3]);
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ret = -1;
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goto socket_cleanup;
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}
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fseek(f, 0, SEEK_END);
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pemSz = ftell(f);
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rewind(f);
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pem = malloc(pemSz);
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if (pem == NULL) {
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fclose(f);
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ret = -1;
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goto socket_cleanup;
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}
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pemSz = fread(pem, 1, pemSz, f);
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fclose(f);
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ret = wolfSSL_CTX_load_verify_buffer(ctx, pem, pemSz, WOLFSSL_FILETYPE_PEM);
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if (ret != SSL_SUCCESS) {
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fprintf(stderr, "ERROR %d: failed to load %s, please check the file.\n",
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ret, argv[3]);
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free(pem);
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goto ctx_cleanup;
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}
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free(pem);
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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;
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goto ctx_cleanup;
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}
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/* Attach wolfSSL to the socket */
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if ((ret = wolfSSL_set_fd(ssl, sockfd)) != WOLFSSL_SUCCESS) {
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fprintf(stderr, "ERROR: Failed to set the file descriptor\n");
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goto cleanup;
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}
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/* Connect to wolfSSL on the server side */
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if ((ret = wolfSSL_connect(ssl)) != SSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to connect to wolfSSL\n");
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goto cleanup;
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}
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/* Get a message for the server from stdin */
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printf("Message for server: ");
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memset(buff, 0, sizeof(buff));
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if (fgets(buff, sizeof(buff), stdin) == NULL) {
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fprintf(stderr, "ERROR: failed to get message for server\n");
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ret = -1;
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goto cleanup;
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}
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len = strnlen(buff, sizeof(buff));
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/* Send the message to the server */
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if ((ret = wolfSSL_write(ssl, buff, len)) != len) {
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fprintf(stderr, "ERROR: failed to write entire message\n");
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fprintf(stderr, "%d bytes of %d bytes were sent", ret, (int) len);
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goto cleanup;
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}
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/* Read the server data into our buff array */
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memset(buff, 0, sizeof(buff));
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if ((ret = wolfSSL_read(ssl, buff, sizeof(buff)-1)) == -1) {
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fprintf(stderr, "ERROR: failed to read\n");
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goto cleanup;
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}
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/* Print to stdout any data the server sends */
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printf("Server: %s\n", buff);
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/* Cleanup and return */
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cleanup:
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wolfSSL_free(ssl); /* Free the wolfSSL object */
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ctx_cleanup:
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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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socket_cleanup:
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close(sockfd); /* Close the connection to the server */
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end:
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return ret; /* Return reporting a success */
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}
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