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openssl-1.0.2f/demos/state_machine/state_machine.c Normal file
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/* ====================================================================
* Copyright (c) 2000 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/*
* Nuron, a leader in hardware encryption technology, generously
* sponsored the development of this demo by Ben Laurie.
*
* See http://www.nuron.com/.
*/
/*
* the aim of this demo is to provide a fully working state-machine
* style SSL implementation, i.e. one where the main loop acquires
* some data, then converts it from or to SSL by feeding it into the
* SSL state machine. It then does any I/O required by the state machine
* and loops.
*
* In order to keep things as simple as possible, this implementation
* listens on a TCP socket, which it expects to get an SSL connection
* on (for example, from s_client) and from then on writes decrypted
* data to stdout and encrypts anything arriving on stdin. Verbose
* commentary is written to stderr.
*
* This implementation acts as a server, but it can also be done for a client. */
#include <openssl/ssl.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <openssl/err.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
/*
* die_unless is intended to work like assert, except that it happens always,
* even if NDEBUG is defined. Use assert as a stopgap.
*/
#define die_unless(x) assert(x)
typedef struct {
SSL_CTX *pCtx;
BIO *pbioRead;
BIO *pbioWrite;
SSL *pSSL;
} SSLStateMachine;
void SSLStateMachine_print_error(SSLStateMachine * pMachine,
const char *szErr)
{
unsigned long l;
fprintf(stderr, "%s\n", szErr);
while ((l = ERR_get_error())) {
char buf[1024];
ERR_error_string_n(l, buf, sizeof buf);
fprintf(stderr, "Error %lx: %s\n", l, buf);
}
}
SSLStateMachine *SSLStateMachine_new(const char *szCertificateFile,
const char *szKeyFile)
{
SSLStateMachine *pMachine = malloc(sizeof *pMachine);
int n;
die_unless(pMachine);
pMachine->pCtx = SSL_CTX_new(SSLv23_server_method());
die_unless(pMachine->pCtx);
n = SSL_CTX_use_certificate_file(pMachine->pCtx, szCertificateFile,
SSL_FILETYPE_PEM);
die_unless(n > 0);
n = SSL_CTX_use_PrivateKey_file(pMachine->pCtx, szKeyFile,
SSL_FILETYPE_PEM);
die_unless(n > 0);
pMachine->pSSL = SSL_new(pMachine->pCtx);
die_unless(pMachine->pSSL);
pMachine->pbioRead = BIO_new(BIO_s_mem());
pMachine->pbioWrite = BIO_new(BIO_s_mem());
SSL_set_bio(pMachine->pSSL, pMachine->pbioRead, pMachine->pbioWrite);
SSL_set_accept_state(pMachine->pSSL);
return pMachine;
}
void SSLStateMachine_read_inject(SSLStateMachine * pMachine,
const unsigned char *aucBuf, int nBuf)
{
int n = BIO_write(pMachine->pbioRead, aucBuf, nBuf);
/*
* If it turns out this assert fails, then buffer the data here and just
* feed it in in churn instead. Seems to me that it should be guaranteed
* to succeed, though.
*/
assert(n == nBuf);
fprintf(stderr, "%d bytes of encrypted data fed to state machine\n", n);
}
int SSLStateMachine_read_extract(SSLStateMachine * pMachine,
unsigned char *aucBuf, int nBuf)
{
int n;
if (!SSL_is_init_finished(pMachine->pSSL)) {
fprintf(stderr, "Doing SSL_accept\n");
n = SSL_accept(pMachine->pSSL);
if (n == 0)
fprintf(stderr, "SSL_accept returned zero\n");
if (n < 0) {
int err;
if ((err =
SSL_get_error(pMachine->pSSL, n)) == SSL_ERROR_WANT_READ) {
fprintf(stderr, "SSL_accept wants more data\n");
return 0;
}
SSLStateMachine_print_error(pMachine, "SSL_accept error");
exit(7);
}
return 0;
}
n = SSL_read(pMachine->pSSL, aucBuf, nBuf);
if (n < 0) {
int err = SSL_get_error(pMachine->pSSL, n);
if (err == SSL_ERROR_WANT_READ) {
fprintf(stderr, "SSL_read wants more data\n");
return 0;
}
SSLStateMachine_print_error(pMachine, "SSL_read error");
exit(8);
}
fprintf(stderr, "%d bytes of decrypted data read from state machine\n",
n);
return n;
}
int SSLStateMachine_write_can_extract(SSLStateMachine * pMachine)
{
int n = BIO_pending(pMachine->pbioWrite);
if (n)
fprintf(stderr, "There is encrypted data available to write\n");
else
fprintf(stderr, "There is no encrypted data available to write\n");
return n;
}
int SSLStateMachine_write_extract(SSLStateMachine * pMachine,
unsigned char *aucBuf, int nBuf)
{
int n;
n = BIO_read(pMachine->pbioWrite, aucBuf, nBuf);
fprintf(stderr, "%d bytes of encrypted data read from state machine\n",
n);
return n;
}
void SSLStateMachine_write_inject(SSLStateMachine * pMachine,
const unsigned char *aucBuf, int nBuf)
{
int n = SSL_write(pMachine->pSSL, aucBuf, nBuf);
/*
* If it turns out this assert fails, then buffer the data here and just
* feed it in in churn instead. Seems to me that it should be guaranteed
* to succeed, though.
*/
assert(n == nBuf);
fprintf(stderr, "%d bytes of unencrypted data fed to state machine\n", n);
}
int OpenSocket(int nPort)
{
int nSocket;
struct sockaddr_in saServer;
struct sockaddr_in saClient;
int one = 1;
int nSize;
int nFD;
int nLen;
nSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (nSocket < 0) {
perror("socket");
exit(1);
}
if (setsockopt
(nSocket, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof one) < 0) {
perror("setsockopt");
exit(2);
}
memset(&saServer, 0, sizeof saServer);
saServer.sin_family = AF_INET;
saServer.sin_port = htons(nPort);
nSize = sizeof saServer;
if (bind(nSocket, (struct sockaddr *)&saServer, nSize) < 0) {
perror("bind");
exit(3);
}
if (listen(nSocket, 512) < 0) {
perror("listen");
exit(4);
}
nLen = sizeof saClient;
nFD = accept(nSocket, (struct sockaddr *)&saClient, &nLen);
if (nFD < 0) {
perror("accept");
exit(5);
}
fprintf(stderr, "Incoming accepted on port %d\n", nPort);
return nFD;
}
int main(int argc, char **argv)
{
SSLStateMachine *pMachine;
int nPort;
int nFD;
const char *szCertificateFile;
const char *szKeyFile;
char rbuf[1];
int nrbuf = 0;
if (argc != 4) {
fprintf(stderr, "%s <port> <certificate file> <key file>\n", argv[0]);
exit(6);
}
nPort = atoi(argv[1]);
szCertificateFile = argv[2];
szKeyFile = argv[3];
SSL_library_init();
OpenSSL_add_ssl_algorithms();
SSL_load_error_strings();
ERR_load_crypto_strings();
nFD = OpenSocket(nPort);
pMachine = SSLStateMachine_new(szCertificateFile, szKeyFile);
for (;;) {
fd_set rfds, wfds;
unsigned char buf[1024];
int n;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
/* Select socket for input */
FD_SET(nFD, &rfds);
/* check whether there's decrypted data */
if (!nrbuf)
nrbuf = SSLStateMachine_read_extract(pMachine, rbuf, 1);
/* if there's decrypted data, check whether we can write it */
if (nrbuf)
FD_SET(1, &wfds);
/* Select socket for output */
if (SSLStateMachine_write_can_extract(pMachine))
FD_SET(nFD, &wfds);
/* Select stdin for input */
FD_SET(0, &rfds);
/* Wait for something to do something */
n = select(nFD + 1, &rfds, &wfds, NULL, NULL);
assert(n > 0);
/* Socket is ready for input */
if (FD_ISSET(nFD, &rfds)) {
n = read(nFD, buf, sizeof buf);
if (n == 0) {
fprintf(stderr, "Got EOF on socket\n");
exit(0);
}
assert(n > 0);
SSLStateMachine_read_inject(pMachine, buf, n);
}
/* stdout is ready for output (and hence we have some to send it) */
if (FD_ISSET(1, &wfds)) {
assert(nrbuf == 1);
buf[0] = rbuf[0];
nrbuf = 0;
n = SSLStateMachine_read_extract(pMachine, buf + 1,
sizeof buf - 1);
if (n < 0) {
SSLStateMachine_print_error(pMachine, "read extract failed");
break;
}
assert(n >= 0);
++n;
if (n > 0) { /* FIXME: has to be true now */
int w;
w = write(1, buf, n);
/* FIXME: we should push back any unwritten data */
assert(w == n);
}
}
/*
* Socket is ready for output (and therefore we have output to send)
*/
if (FD_ISSET(nFD, &wfds)) {
int w;
n = SSLStateMachine_write_extract(pMachine, buf, sizeof buf);
assert(n > 0);
w = write(nFD, buf, n);
/* FIXME: we should push back any unwritten data */
assert(w == n);
}
/* Stdin is ready for input */
if (FD_ISSET(0, &rfds)) {
n = read(0, buf, sizeof buf);
if (n == 0) {
fprintf(stderr, "Got EOF on stdin\n");
exit(0);
}
assert(n > 0);
SSLStateMachine_write_inject(pMachine, buf, n);
}
}
/* not reached */
return 0;
}