226 lines
6.6 KiB
C
226 lines
6.6 KiB
C
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/* client-psk-resume.c
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*
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* Copyright (C) 2006-2020 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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#include <wolfssl/options.h> /* included for options sync */
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#include <wolfssl/ssl.h> /* must include this to use wolfSSL security */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <signal.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#define MAXLINE 256 /* max text line length */
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#define SERV_PORT 11111 /* default port*/
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#define PSK_KEY_LEN 4
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#ifndef NO_PSK
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/*
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*psk client set up.
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*/
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static inline unsigned int My_Psk_Client_Cb(WOLFSSL* ssl, const char* hint,
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char* identity, unsigned int id_max_len, unsigned char* key,
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unsigned int key_max_len)
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{
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(void)ssl;
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(void)hint;
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(void)key_max_len;
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/* identity is OpenSSL testing default for openssl s_client, keep same*/
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strncpy(identity, "Client_identity", id_max_len);
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/* test key n hex is 0x1a2b3c4d , in decimal 439,041,101, we're using
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* unsigned binary */
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key[0] = 26;
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key[1] = 43;
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key[2] = 60;
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key[3] = 77;
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return PSK_KEY_LEN;
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}
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#endif
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int main(int argc, char **argv){
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int sockfd = SOCKET_INVALID;
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int sock = SOCKET_INVALID;
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int ret;
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char sendline[MAXLINE]="Hello Server"; /* string to send to the server */
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char recvline[MAXLINE]; /* string received from the server */
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WOLFSSL* ssl = NULL;
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WOLFSSL* sslResume = NULL;
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WOLFSSL_SESSION* session = NULL;
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WOLFSSL_CTX* ctx = NULL;
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struct sockaddr_in servaddr;;
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/* must include an ip address of this will flag */
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if (argc != 2) {
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printf("Usage: tcpClient <IPaddress>\n");
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return -1;
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}
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/* create a stream socket using tcp,internet protocal IPv4,
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* full-duplex stream */
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sockfd = socket(AF_INET, SOCK_STREAM, 0);
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/* places n zero-valued bytes in the address servaddr */
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memset(&servaddr, 0, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_port = htons(SERV_PORT);
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/* converts IPv4 addresses from text to binary form */
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ret = inet_pton(AF_INET, argv[1], &servaddr.sin_addr);
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if (ret != 1){
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ret = -1; goto exit;
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}
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/* attempts to make a connection on a socket */
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ret = connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
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if (ret != 0 ){
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ret = -1; goto exit;
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}
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wolfSSL_Init(); /* initialize wolfSSL */
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/* create and initialize WOLFSSL_CTX structure */
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if ((ctx = wolfSSL_CTX_new(wolfTLSv1_2_client_method())) == NULL) {
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fprintf(stderr, "wolfSSL_CTX_new error.\n");
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ret = -1; goto exit;
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}
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#ifndef NO_PSK
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/* set up pre shared keys */
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wolfSSL_CTX_set_psk_client_callback(ctx, My_Psk_Client_Cb);
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#else
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fprintf(stderr, "Warning: wolfSSL not built with PSK (--enable-psk)\n");
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#endif
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/* create wolfSSL object after each tcp connect */
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if ( (ssl = wolfSSL_new(ctx)) == NULL) {
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fprintf(stderr, "wolfSSL_new error.\n");
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ret = -1; goto exit;
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}
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/* associate the file descriptor with the session */
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wolfSSL_set_fd(ssl, sockfd);
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/* takes inputting string and outputs it to the server */
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if (wolfSSL_write(ssl, sendline, sizeof(sendline)) != sizeof(sendline)) {
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printf("Write Error to Server\n");
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ret = -1; goto exit;
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}
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/* flags if the Server stopped before the client could end */
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if (wolfSSL_read(ssl, recvline, MAXLINE) < 0 ) {
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printf("Client: Server Terminated Prematurely!\n");
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ret = -1; goto exit;
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}
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/* show message from the server */
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printf("Server Message: %s\n", recvline);
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/* Save the session ID to reuse */
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session = wolfSSL_get_session(ssl);
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sslResume = wolfSSL_new(ctx);
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/* shut down wolfSSL */
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wolfSSL_shutdown(ssl);
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/* close connection */
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close(sockfd);
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/* cleanup without wolfSSL_Cleanup() and wolfSSL_CTX_free() for now */
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wolfSSL_free(ssl);
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/*
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* resume session, start new connection and socket
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*/
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/* start a new socket connection */
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sock = socket(AF_INET, SOCK_STREAM, 0);
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/* connect to the socket */
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ret = connect(sock, (struct sockaddr *) &servaddr, sizeof(servaddr));
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if (ret != 0){
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goto exit;
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}
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/* set the session ID to connect to the server */
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wolfSSL_set_fd(sslResume, sock);
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wolfSSL_set_session(sslResume, session);
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/* check has connect successfully */
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if (wolfSSL_connect(sslResume) != WOLFSSL_SUCCESS) {
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printf("SSL resume failed\n");
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ret = -1;
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goto exit;
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}
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if (wolfSSL_write(sslResume, sendline, sizeof(sendline)) != sizeof(sendline)) {
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printf("Write Error to Server\n");
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ret = -1;
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goto exit;
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}
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/* flags if the Server stopped before the client could end */
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if (wolfSSL_read(sslResume, recvline, MAXLINE) < 0 ) {
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printf("Client: Server Terminated Prematurely!\n");
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ret = -1;
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goto exit;
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}
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/* show message from the server */
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printf("Server Message: %s\n", recvline);
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/* check to see if the session id is being reused */
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if (wolfSSL_session_reused(sslResume)) {
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printf("reused session id\n");
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}
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else{
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printf("didn't reuse session id!!!\n");
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}
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/* shut down wolfSSL */
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wolfSSL_shutdown(sslResume);
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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 (sslResume)
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wolfSSL_free(sslResume); /* Free the wolfSSL object */
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if (sockfd != SOCKET_INVALID)
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close(sockfd); /* Close the socket */
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if (sock != SOCKET_INVALID)
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close(sock); /* Close the socket */
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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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return ret; /* Return reporting a success */
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}
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