1 /* ====================================================================
2 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
16 * 3. All advertising materials mentioning features or use of this
17 * software must display the following acknowledgment:
18 * "This product includes software developed by the OpenSSL Project
19 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For written permission, please contact
24 * openssl-core@openssl.org.
26 * 5. Products derived from this software may not be called "OpenSSL"
27 * nor may "OpenSSL" appear in their names without prior written
28 * permission of the OpenSSL Project.
30 * 6. Redistributions of any form whatsoever must retain the following
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
49 * This product includes cryptographic software written by Eric Young
50 * (eay@cryptsoft.com). This product includes software written by Tim
51 * Hudson (tjh@cryptsoft.com).
56 * Nuron, a leader in hardware encryption technology, generously
57 * sponsored the development of this demo by Ben Laurie.
59 * See http://www.nuron.com/.
63 * the aim of this demo is to provide a fully working state-machine
64 * style SSL implementation, i.e. one where the main loop acquires
65 * some data, then converts it from or to SSL by feeding it into the
66 * SSL state machine. It then does any I/O required by the state machine
69 * In order to keep things as simple as possible, this implementation
70 * listens on a TCP socket, which it expects to get an SSL connection
71 * on (for example, from s_client) and from then on writes decrypted
72 * data to stdout and encrypts anything arriving on stdin. Verbose
73 * commentary is written to stderr.
75 * This implementation acts as a server, but it can also be done for a client. */
77 #include <openssl/ssl.h>
81 #include <openssl/err.h>
82 #include <sys/types.h>
83 #include <sys/socket.h>
84 #include <netinet/in.h>
87 * die_unless is intended to work like assert, except that it happens always,
88 * even if NDEBUG is defined. Use assert as a stopgap.
91 #define die_unless(x) assert(x)
100 void SSLStateMachine_print_error(SSLStateMachine * pMachine,
105 fprintf(stderr, "%s\n", szErr);
106 while ((l = ERR_get_error())) {
109 ERR_error_string_n(l, buf, sizeof buf);
110 fprintf(stderr, "Error %lx: %s\n", l, buf);
114 SSLStateMachine *SSLStateMachine_new(const char *szCertificateFile,
115 const char *szKeyFile)
117 SSLStateMachine *pMachine = malloc(sizeof(*pMachine));
120 die_unless(pMachine);
122 pMachine->pCtx = SSL_CTX_new(SSLv23_server_method());
123 die_unless(pMachine->pCtx);
125 n = SSL_CTX_use_certificate_file(pMachine->pCtx, szCertificateFile,
129 n = SSL_CTX_use_PrivateKey_file(pMachine->pCtx, szKeyFile,
133 pMachine->pSSL = SSL_new(pMachine->pCtx);
134 die_unless(pMachine->pSSL);
136 pMachine->pbioRead = BIO_new(BIO_s_mem());
138 pMachine->pbioWrite = BIO_new(BIO_s_mem());
140 SSL_set_bio(pMachine->pSSL, pMachine->pbioRead, pMachine->pbioWrite);
142 SSL_set_accept_state(pMachine->pSSL);
147 void SSLStateMachine_read_inject(SSLStateMachine * pMachine,
148 const unsigned char *aucBuf, int nBuf)
150 int n = BIO_write(pMachine->pbioRead, aucBuf, nBuf);
152 * If it turns out this assert fails, then buffer the data here and just
153 * feed it in in churn instead. Seems to me that it should be guaranteed
154 * to succeed, though.
157 fprintf(stderr, "%d bytes of encrypted data fed to state machine\n", n);
160 int SSLStateMachine_read_extract(SSLStateMachine * pMachine,
161 unsigned char *aucBuf, int nBuf)
165 if (!SSL_is_init_finished(pMachine->pSSL)) {
166 fprintf(stderr, "Doing SSL_accept\n");
167 n = SSL_accept(pMachine->pSSL);
169 fprintf(stderr, "SSL_accept returned zero\n");
174 SSL_get_error(pMachine->pSSL, n)) == SSL_ERROR_WANT_READ) {
175 fprintf(stderr, "SSL_accept wants more data\n");
179 SSLStateMachine_print_error(pMachine, "SSL_accept error");
185 n = SSL_read(pMachine->pSSL, aucBuf, nBuf);
187 int err = SSL_get_error(pMachine->pSSL, n);
189 if (err == SSL_ERROR_WANT_READ) {
190 fprintf(stderr, "SSL_read wants more data\n");
194 SSLStateMachine_print_error(pMachine, "SSL_read error");
198 fprintf(stderr, "%d bytes of decrypted data read from state machine\n",
203 int SSLStateMachine_write_can_extract(SSLStateMachine * pMachine)
205 int n = BIO_pending(pMachine->pbioWrite);
207 fprintf(stderr, "There is encrypted data available to write\n");
209 fprintf(stderr, "There is no encrypted data available to write\n");
214 int SSLStateMachine_write_extract(SSLStateMachine * pMachine,
215 unsigned char *aucBuf, int nBuf)
219 n = BIO_read(pMachine->pbioWrite, aucBuf, nBuf);
220 fprintf(stderr, "%d bytes of encrypted data read from state machine\n",
225 void SSLStateMachine_write_inject(SSLStateMachine * pMachine,
226 const unsigned char *aucBuf, int nBuf)
228 int n = SSL_write(pMachine->pSSL, aucBuf, nBuf);
230 * If it turns out this assert fails, then buffer the data here and just
231 * feed it in in churn instead. Seems to me that it should be guaranteed
232 * to succeed, though.
235 fprintf(stderr, "%d bytes of unencrypted data fed to state machine\n", n);
238 int OpenSocket(int nPort)
241 struct sockaddr_in saServer;
242 struct sockaddr_in saClient;
248 nSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
255 (nSocket, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof one) < 0) {
256 perror("setsockopt");
260 memset(&saServer, 0, sizeof(saServer));
261 saServer.sin_family = AF_INET;
262 saServer.sin_port = htons(nPort);
263 nSize = sizeof saServer;
264 if (bind(nSocket, (struct sockaddr *)&saServer, nSize) < 0) {
269 if (listen(nSocket, 512) < 0) {
274 nLen = sizeof saClient;
275 nFD = accept(nSocket, (struct sockaddr *)&saClient, &nLen);
281 fprintf(stderr, "Incoming accepted on port %d\n", nPort);
286 int main(int argc, char **argv)
288 SSLStateMachine *pMachine;
291 const char *szCertificateFile;
292 const char *szKeyFile;
297 fprintf(stderr, "%s <port> <certificate file> <key file>\n", argv[0]);
301 nPort = atoi(argv[1]);
302 szCertificateFile = argv[2];
305 OpenSSL_add_ssl_algorithms();
306 SSL_load_error_strings();
308 nFD = OpenSocket(nPort);
310 pMachine = SSLStateMachine_new(szCertificateFile, szKeyFile);
314 unsigned char buf[1024];
320 /* Select socket for input */
323 /* check whether there's decrypted data */
325 nrbuf = SSLStateMachine_read_extract(pMachine, rbuf, 1);
327 /* if there's decrypted data, check whether we can write it */
331 /* Select socket for output */
332 if (SSLStateMachine_write_can_extract(pMachine))
335 /* Select stdin for input */
338 /* Wait for something to do something */
339 n = select(nFD + 1, &rfds, &wfds, NULL, NULL);
342 /* Socket is ready for input */
343 if (FD_ISSET(nFD, &rfds)) {
344 n = read(nFD, buf, sizeof buf);
346 fprintf(stderr, "Got EOF on socket\n");
351 SSLStateMachine_read_inject(pMachine, buf, n);
354 /* stdout is ready for output (and hence we have some to send it) */
355 if (FD_ISSET(1, &wfds)) {
360 n = SSLStateMachine_read_extract(pMachine, buf + 1,
363 SSLStateMachine_print_error(pMachine, "read extract failed");
368 if (n > 0) { /* FIXME: has to be true now */
371 w = write(1, buf, n);
372 /* FIXME: we should push back any unwritten data */
378 * Socket is ready for output (and therefore we have output to send)
380 if (FD_ISSET(nFD, &wfds)) {
383 n = SSLStateMachine_write_extract(pMachine, buf, sizeof buf);
386 w = write(nFD, buf, n);
387 /* FIXME: we should push back any unwritten data */
391 /* Stdin is ready for input */
392 if (FD_ISSET(0, &rfds)) {
393 n = read(0, buf, sizeof buf);
395 fprintf(stderr, "Got EOF on stdin\n");
400 SSLStateMachine_write_inject(pMachine, buf, n);