258 lines
7.4 KiB
C
258 lines
7.4 KiB
C
/* client-tls-session.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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/* the usual suspects */
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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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#define CERT_FILE "../certs/client-cert.pem"
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#define KEY_FILE "../certs/client-key.pem"
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#define CA_CERT_FILE "../certs/ca-cert.pem"
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#define LOCALHOST "127.0.0.1"
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#define DEFAULT_PORT 11111
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#define SAVED_SESS "session.bin"
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#define MSG_SIZE 256
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/* Print SSL error message */
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static void print_SSL_error(const char* msg, SSL* ssl)
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{
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int err;
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if (ssl != NULL) {
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err = wolfSSL_get_error(ssl, 0);
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fprintf(stderr, "ERROR: %s (err %d, %s)\n", msg, err,
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ERR_error_string(err, NULL));
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}
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else {
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fprintf(stderr, "ERROR: %s \n", msg);
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}
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}
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/* write a session to the file */
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static int write_SESS(WOLFSSL_SESSION* sess, const char* file)
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{
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FILE* fp = NULL;
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unsigned char* buff = NULL;
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size_t sz;
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int ret = WOLFSSL_FAILURE;
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if ((fp = fopen(file, "wb")) == NULL) {
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fprintf(stderr, "ERROR : file %s does't exists\n", file);
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goto cleanup;
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}
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if ((sz = wolfSSL_i2d_SSL_SESSION(sess, &buff)) <= 0){
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print_SSL_error("wolfSSL_i2d_SSL_SESSION", NULL);
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goto cleanup;
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}
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if ((fwrite(buff, 1, sz, fp)) != sz) {
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fprintf(stderr, "ERROR : failed fwrite\n");
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goto cleanup;
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}
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cleanup:
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if (fp)
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fclose(fp);
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if (buff)
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free(buff);
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return ret;
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}
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int main(int argc, char **argv)
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{
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struct sockaddr_in servAddr;
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int sockfd = -1;
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char *ipadd = LOCALHOST;
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char *ca_cert = CA_CERT_FILE;
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int port = DEFAULT_PORT;
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static const char kHttpGetMsg[] = "GET /index.html HTTP/1.0\r\n\r\n";
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struct hostent *host;
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char msg[MSG_SIZE];
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int ret = WOLFSSL_FAILURE;
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(void)ipadd;
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/* SSL objects */
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WOLFSSL_CTX* ctx = NULL;
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WOLFSSL* ssl = NULL;
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memset(&servAddr, 0, sizeof(servAddr));
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/* SSL SESSION object */
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WOLFSSL_SESSION* session= NULL;
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/* Check for proper calling convention */
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if (argc == 1)
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fprintf(stderr, "Send to localhost(%s)\n", LOCALHOST);
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if (argc >=2) {
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host = gethostbyname(argv[1]);
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memcpy(&servAddr.sin_addr, host->h_addr_list[0], host->h_length);
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}
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if (argc >= 3)
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ca_cert = argv[2];
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if (argc == 4)
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port = atoi(argv[3]);
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if (argc >= 5) {
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fprintf(stderr, "ERROR: Too many arguments.\n");
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goto cleanup;
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}
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/* Initialize library */
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if (wolfSSL_library_init() != WOLFSSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to initialize the library\n");
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goto cleanup;
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}
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/* Create and initialize an SSL context object*/
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if ((ctx = wolfSSL_CTX_new(SSLv23_client_method())) == NULL) {
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fprintf(stderr, "ERROR: failed to create an SSL context object\n");
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goto cleanup;
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}
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/* Load client certificate 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 cleanup;
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}
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/* Load client 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 cleanup;
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}
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/* Load CA certificate to the context */
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if ((ret = wolfSSL_CTX_load_verify_locations(ctx, ca_cert, NULL))
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!= WOLFSSL_SUCCESS) {
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fprintf(stderr, "ERROR: failed to load %s \n", ca_cert);
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goto cleanup;
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}
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/*
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* Set up a TCP Socket and connect to the server
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*/
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if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
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fprintf(stderr, "ERROR: failed to create a socket. errno %d\n", errno);
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goto cleanup;
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}
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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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if ((ret = connect(sockfd, (struct sockaddr *)&servAddr, sizeof(servAddr)))
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== -1) {
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fprintf(stderr, "ERROR: failed to connect. errno %d\n", errno);
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goto cleanup;
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}
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/* Create an SSL object */
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if ((ssl = wolfSSL_new(ctx)) == NULL) {
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fprintf(stderr, "ERROR: failed to create an SSL object\n");
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goto cleanup;
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}
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/* Attach the socket to the SSL */
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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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/* SSL connect to the server */
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if ((ret = wolfSSL_connect(ssl)) != WOLFSSL_SUCCESS) {
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print_SSL_error("failed SSL connect", ssl);
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goto cleanup;
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}
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/*
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* Application messaging
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*/
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while (1) {
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printf("Message to send: ");
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if(fgets(msg, sizeof(msg), stdin) <= 0)
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break;
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if (strcmp(msg, "\n") == 0){ /* if empty send HTTP request */
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strncpy(msg, kHttpGetMsg, sizeof(msg));
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} else
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msg[strnlen(msg, sizeof(msg)) - 1] = '\0';
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/* send a message to the server */
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if ((ret = wolfSSL_write(ssl, msg, strnlen(msg, sizeof(msg)))) < 0)
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{
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print_SSL_error("failed SSL write", ssl);
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break;
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}
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/*
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* closing the session, and write session information into a file
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* before writing session information
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*/
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if (strcmp(msg, "break") == 0) {
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session = wolfSSL_get_session(ssl);
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ret = write_SESS(session, SAVED_SESS);
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break;
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}
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/* receive a message from the server */
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if ((ret = wolfSSL_read(ssl, msg, sizeof(msg) - 1)) < 0) {
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print_SSL_error("failed SSL read", ssl);
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break;
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}
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msg[ret] = '\0';
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printf("Received: %s\n", msg);
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}
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/* Cleanup and return */
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cleanup:
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if (session != NULL) {
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wolfSSL_SESSION_free(session);
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}
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if (ssl != NULL) {
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wolfSSL_shutdown(ssl);
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wolfSSL_free(ssl);
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}
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if (sockfd != -1)
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close(sockfd);
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if (ctx != NULL)
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wolfSSL_CTX_free(ctx);
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if (ret != WOLFSSL_SUCCESS)
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ret = WOLFSSL_FAILURE;
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printf("End of TLS Client\n");
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return ret;
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}
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