365 lines
12 KiB
C
365 lines
12 KiB
C
/* server-psk-nonblocking.c
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* A server ecample using a TCP connection with PSK security and non blocking.
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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 option sync */
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#include <wolfssl/ssl.h> /* include wolfSSL security */
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#include <sys/socket.h>
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#include <netinet/in.h>
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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 <unistd.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 <fcntl.h> /* needed for running non-blocking connections */
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#include <time.h> /* for time out on read loop */
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#define MAXLINE 4096
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#define LISTENQ 1024
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#define SERV_PORT 11111
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#define PSK_KEY_LEN 4
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#define dhParamFile "../certs/dh2048.pem"
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/* states of the tcp connection */
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enum{
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TEST_SELECT_FAIL = 0,
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TEST_TIMEOUT,
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TEST_RECV_READY,
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TEST_ERROR_READY
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};
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/*
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* Used for finding psk value.
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*/
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static inline unsigned int my_psk_server_cb(WOLFSSL* ssl, const char* identity,
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unsigned char* key, unsigned int key_max_len)
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{
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(void)ssl;
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(void)key_max_len;
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if (strncmp(identity, "Client_identity", 15) != 0) {
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return 0;
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}
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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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int main()
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{
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int n; /* length of string read */
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int ret;
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int error;
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int result;
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int select_ret = TEST_SELECT_FAIL;
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int sockfd;
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int nfds;
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int currTimeout = 1;
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int listenfd, connfd;
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int opt;
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char buff[MAXLINE]; /* buffer for tcp connection */
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char buf[MAXLINE]; /* string read from client */
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char response[] = "I hear ya for shizzle";
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char suites[] =
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#ifdef WOLFSSL_STATIC_PSK
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"PSK-AES256-GCM-SHA384:"
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"PSK-AES128-GCM-SHA256:"
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"PSK-AES256-CBC-SHA384:"
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"PSK-AES128-CBC-SHA256:"
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"PSK-AES128-CBC-SHA:"
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"PSK-AES256-CBC-SHA:"
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"PSK-CHACHA20-POLY1305:"
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#endif
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#if defined(WOLFSSL_TLS13_DRAFT18) || defined(WOLFSSL_TLS13_DRAFT22) || \
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defined(WOLFSSL_TLS13_DRAFT23) || defined(WOLFSSL_TLS13_DRAFT26) || \
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defined(WOLFSSL_TLS13)
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"TLS13-AES128-GCM-SHA256:"
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"TLS13-AES256-GCM-SHA384:"
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"TLS13-CHACHA20-POLY1305-SHA256:"
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#endif
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#ifndef NO_DH
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"DHE-PSK-AES256-GCM-SHA384:"
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"DHE-PSK-AES128-GCM-SHA256:"
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"DHE-PSK-AES256-CBC-SHA384:"
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"DHE-PSK-AES128-CBC-SHA256:"
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"DHE-PSK-CHACHA20-POLY1305"
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#endif
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"ECDHE-PSK-AES128-CBC-SHA256:"
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"ECDHE-PSK-CHACHA20-POLY1305:";
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fd_set recvfds, errfds;
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socklen_t cliLen;
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WOLFSSL_CTX* ctx;
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struct sockaddr_in cliAddr, servAddr;
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struct timeval timeout = {currTimeout, 0};
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/* find a socket */
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listenfd = socket(AF_INET, SOCK_STREAM, 0);
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if (listenfd < 0) {
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printf("Fatal error : socket error\n");
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return 1;
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}
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/* set up server address and port */
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memset(&servAddr, 0, sizeof(servAddr));
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servAddr.sin_family = AF_INET;
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servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
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servAddr.sin_port = htons(SERV_PORT);
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/* bind to a socket */
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opt = 1;
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if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (const void*)&opt,
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sizeof(int)) != 0) {
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printf("Fatal error : setsockopt error");
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return 1;
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}
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if (bind(listenfd, (struct sockaddr *) &servAddr, sizeof(servAddr)) < 0) {
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printf("Fatal error : bind error\n");
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return 1;
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}
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wolfSSL_Init();
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if ((ctx = wolfSSL_CTX_new(wolfSSLv23_server_method())) == NULL) {
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printf("Fatal error : wolfSSL_CTX_new error\n");
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return 1;
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}
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/* use psk suite for security */
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wolfSSL_CTX_set_psk_server_callback(ctx, my_psk_server_cb);
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wolfSSL_CTX_use_psk_identity_hint(ctx, "wolfssl server");
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if (wolfSSL_CTX_set_cipher_list(ctx, suites) != WOLFSSL_SUCCESS) {
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printf("Fatal error : server can't set cipher list\n");
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return 1;
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}
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#ifndef NO_DH
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if ((ret = wolfSSL_CTX_SetTmpDH_file(ctx, dhParamFile, WOLFSSL_FILETYPE_PEM)
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) != WOLFSSL_SUCCESS) {
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printf("Fatal error: server set temp DH params returned %d\n", ret);
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return ret;
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}
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#endif
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/* main loop for accepting and responding to clients */
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for ( ; ; ) {
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WOLFSSL* ssl;
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/* listen to the socket */
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if (listen(listenfd, LISTENQ) < 0) {
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printf("Fatal error : listen error\n");
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return 1;
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}
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cliLen = sizeof(cliAddr);
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connfd = accept(listenfd, (struct sockaddr *) &cliAddr, &cliLen);
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if (connfd < 0) {
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if (errno != EINTR) {
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printf("Fatal error : accept error\n");
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return 1;
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}
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}
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else {
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printf("Connection from %s, port %d\n",
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inet_ntop(AF_INET, &cliAddr.sin_addr, buff, sizeof(buff)),
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ntohs(cliAddr.sin_port));
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/* create WOLFSSL object */
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if ((ssl = wolfSSL_new(ctx)) == NULL) {
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printf("Fatal error : wolfSSL_new error\n");
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return 1;
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}
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wolfSSL_set_fd(ssl, connfd);
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sockfd = wolfSSL_get_fd(ssl);
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/* set wolfSSL and socket to non blocking and respond */
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wolfSSL_set_using_nonblock(ssl, 1);
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if (fcntl(connfd, F_SETFL, O_NONBLOCK) < 0) {
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printf("Fatal error : fcntl set failed\n");
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return 1;
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}
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ret = wolfSSL_accept(ssl);
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error = wolfSSL_get_error(ssl, 0);
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/* clear buffer for client response to prevent unexpected output */
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memset(buf, 0, MAXLINE);
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do {
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while (ret != WOLFSSL_SUCCESS &&
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(error == WOLFSSL_ERROR_WANT_READ ||
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error == WOLFSSL_ERROR_WANT_WRITE)) {
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/* print out for user notification */
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if (error == WOLFSSL_ERROR_WANT_READ) {
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printf("... server would read block\n");
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}
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else {
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printf("... server would write block\n");
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}
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FD_ZERO(&recvfds);
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FD_SET(sockfd, &recvfds);
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FD_ZERO(&errfds);
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FD_SET(sockfd, &errfds);
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nfds = sockfd + 1;
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result = select(nfds, &recvfds, NULL, &errfds, &timeout);
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if (result == 0) {
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select_ret = TEST_TIMEOUT;
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}
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else if (result > 0) {
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if (FD_ISSET(sockfd, &recvfds)) {
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select_ret = TEST_RECV_READY;
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}
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else if (FD_ISSET(sockfd, &errfds)) {
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select_ret = TEST_ERROR_READY;
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}
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}
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else {
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select_ret = TEST_SELECT_FAIL;
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}
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/* if tcp_select signal is ready try to accept else continue loop */
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if ((select_ret == TEST_RECV_READY) ||
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(select_ret == TEST_ERROR_READY)) {
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ret = wolfSSL_accept(ssl);
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error = wolfSSL_get_error(ssl, 0);
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}
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else if (select_ret == TEST_TIMEOUT) {
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error = WOLFSSL_ERROR_WANT_READ;
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}
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else {
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error = WOLFSSL_FATAL_ERROR;
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}
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}
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/* failure to accept */
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if (ret != WOLFSSL_SUCCESS) {
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printf("Fatal error : wolfSSL_accept failed\n");
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ret = WOLFSSL_FATAL_ERROR;
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}
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if (ret != WOLFSSL_SUCCESS) {
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return 1;
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}
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n = wolfSSL_read(ssl, buf, MAXLINE);
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if (n > 0) {
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printf("%s\n", buf);
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}
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}
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while(n < 0);
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while (ret != WOLFSSL_SUCCESS &&
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(error == WOLFSSL_ERROR_WANT_READ ||
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error == WOLFSSL_ERROR_WANT_WRITE)) {
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/* print out for user notification */
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if (error == WOLFSSL_ERROR_WANT_READ) {
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printf("... server would read block\n");
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}
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else {
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printf("... server would write block\n");
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}
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FD_ZERO(&recvfds);
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FD_SET(sockfd, &recvfds);
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FD_ZERO(&errfds);
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FD_SET(sockfd, &errfds);
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nfds = sockfd + 1;
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result = select(nfds, &recvfds, NULL, &errfds, &timeout);
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if (result == 0) {
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select_ret = TEST_TIMEOUT;
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}
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else if (result > 0) {
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if (FD_ISSET(sockfd, &recvfds)) {
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select_ret = TEST_RECV_READY;
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}
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else if (FD_ISSET(sockfd, &errfds)) {
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select_ret = TEST_ERROR_READY;
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}
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}
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else {
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select_ret = TEST_SELECT_FAIL;
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}
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/* if tcp_select signals ready try to accept otherwise continue loop*/
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if ((select_ret == TEST_RECV_READY) ||
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(select_ret == TEST_ERROR_READY)) {
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ret = wolfSSL_accept(ssl);
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error = wolfSSL_get_error(ssl, 0);
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}
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else if (select_ret == TEST_TIMEOUT) {
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error = WOLFSSL_ERROR_WANT_READ;
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}
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else {
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error = WOLFSSL_FATAL_ERROR;
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}
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}
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/* failure to accept */
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if (ret != WOLFSSL_SUCCESS) {
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printf("Fatal error : wolfSSL_accept failed\n");
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ret = WOLFSSL_FATAL_ERROR;
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}
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if (ret != WOLFSSL_SUCCESS) {
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return 1;
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}
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if ( wolfSSL_write(ssl, response, strlen(response)) !=
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strlen(response)) {
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printf("Fatal error : respond: write error\n");
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return 1;
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}
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/* closes the connections after responding */
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if (close(connfd) == -1) {
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printf("Fatal error : close error\n");
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return 1;
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}
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wolfSSL_shutdown(ssl);
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wolfSSL_free(ssl);
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}
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}
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/* free up memory used by wolfssl */
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wolfSSL_CTX_free(ctx);
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wolfSSL_Cleanup();
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return 0;
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}
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