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1/* ====================================================================
2 * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *
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
14 *    distribution.
15 *
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/)"
20 *
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.
25 *
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.
29 *
30 * 6. Redistributions of any form whatsoever must retain the following
31 *    acknowledgment:
32 *    "This product includes software developed by the OpenSSL Project
33 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
34 *
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 * ====================================================================
48 *
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).
52 *
53 */
54
55/*
56 * Nuron, a leader in hardware encryption technology, generously
57 * sponsored the development of this demo by Ben Laurie.
58 *
59 * See http://www.nuron.com/.
60 */
61
62/*
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
67 * and loops.
68 *
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.
74 *
75 * This implementation acts as a server, but it can also be done for a client.  */
76
77#include <openssl/ssl.h>
78#include <assert.h>
79#include <unistd.h>
80#include <string.h>
81#include <openssl/err.h>
82#include <sys/types.h>
83#include <sys/socket.h>
84#include <netinet/in.h>
85
86/* die_unless is intended to work like assert, except that it happens
87   always, even if NDEBUG is defined. Use assert as a stopgap. */
88
89#define die_unless(x)	assert(x)
90
91typedef struct
92    {
93    SSL_CTX *pCtx;
94    BIO *pbioRead;
95    BIO *pbioWrite;
96    SSL *pSSL;
97    } SSLStateMachine;
98
99void SSLStateMachine_print_error(SSLStateMachine *pMachine,const char *szErr)
100    {
101    unsigned long l;
102
103    fprintf(stderr,"%s\n",szErr);
104    while((l=ERR_get_error()))
105	{
106	char buf[1024];
107
108	ERR_error_string_n(l,buf,sizeof buf);
109	fprintf(stderr,"Error %lx: %s\n",l,buf);
110	}
111    }
112
113SSLStateMachine *SSLStateMachine_new(const char *szCertificateFile,
114				     const char *szKeyFile)
115    {
116    SSLStateMachine *pMachine=malloc(sizeof *pMachine);
117    int n;
118
119    die_unless(pMachine);
120
121    pMachine->pCtx=SSL_CTX_new(SSLv23_server_method());
122    die_unless(pMachine->pCtx);
123
124    n=SSL_CTX_use_certificate_file(pMachine->pCtx,szCertificateFile,
125				   SSL_FILETYPE_PEM);
126    die_unless(n > 0);
127
128    n=SSL_CTX_use_PrivateKey_file(pMachine->pCtx,szKeyFile,SSL_FILETYPE_PEM);
129    die_unless(n > 0);
130
131    pMachine->pSSL=SSL_new(pMachine->pCtx);
132    die_unless(pMachine->pSSL);
133
134    pMachine->pbioRead=BIO_new(BIO_s_mem());
135
136    pMachine->pbioWrite=BIO_new(BIO_s_mem());
137
138    SSL_set_bio(pMachine->pSSL,pMachine->pbioRead,pMachine->pbioWrite);
139
140    SSL_set_accept_state(pMachine->pSSL);
141
142    return pMachine;
143    }
144
145void SSLStateMachine_read_inject(SSLStateMachine *pMachine,
146				 const unsigned char *aucBuf,int nBuf)
147    {
148    int n=BIO_write(pMachine->pbioRead,aucBuf,nBuf);
149    /* If it turns out this assert fails, then buffer the data here
150     * and just feed it in in churn instead. Seems to me that it
151     * should be guaranteed to succeed, though.
152     */
153    assert(n == nBuf);
154    fprintf(stderr,"%d bytes of encrypted data fed to state machine\n",n);
155    }
156
157int SSLStateMachine_read_extract(SSLStateMachine *pMachine,
158				 unsigned char *aucBuf,int nBuf)
159    {
160    int n;
161
162    if(!SSL_is_init_finished(pMachine->pSSL))
163	{
164	fprintf(stderr,"Doing SSL_accept\n");
165	n=SSL_accept(pMachine->pSSL);
166	if(n == 0)
167	    fprintf(stderr,"SSL_accept returned zero\n");
168	if(n < 0)
169	    {
170	    int err;
171
172	    if((err=SSL_get_error(pMachine->pSSL,n)) == SSL_ERROR_WANT_READ)
173		{
174		fprintf(stderr,"SSL_accept wants more data\n");
175		return 0;
176		}
177
178	    SSLStateMachine_print_error(pMachine,"SSL_accept error");
179	    exit(7);
180	    }
181	return 0;
182	}
183
184    n=SSL_read(pMachine->pSSL,aucBuf,nBuf);
185    if(n < 0)
186	{
187	int err=SSL_get_error(pMachine->pSSL,n);
188
189	if(err == SSL_ERROR_WANT_READ)
190	    {
191	    fprintf(stderr,"SSL_read wants more data\n");
192	    return 0;
193	    }
194
195	SSLStateMachine_print_error(pMachine,"SSL_read error");
196	exit(8);
197	}
198
199    fprintf(stderr,"%d bytes of decrypted data read from state machine\n",n);
200    return n;
201    }
202
203int SSLStateMachine_write_can_extract(SSLStateMachine *pMachine)
204    {
205    int n=BIO_pending(pMachine->pbioWrite);
206    if(n)
207	fprintf(stderr,"There is encrypted data available to write\n");
208    else
209	fprintf(stderr,"There is no encrypted data available to write\n");
210
211    return n;
212    }
213
214int SSLStateMachine_write_extract(SSLStateMachine *pMachine,
215				  unsigned char *aucBuf,int nBuf)
216    {
217    int n;
218
219    n=BIO_read(pMachine->pbioWrite,aucBuf,nBuf);
220    fprintf(stderr,"%d bytes of encrypted data read from state machine\n",n);
221    return n;
222    }
223
224void SSLStateMachine_write_inject(SSLStateMachine *pMachine,
225				  const unsigned char *aucBuf,int nBuf)
226    {
227    int n=SSL_write(pMachine->pSSL,aucBuf,nBuf);
228    /* If it turns out this assert fails, then buffer the data here
229     * and just feed it in in churn instead. Seems to me that it
230     * should be guaranteed to succeed, though.
231     */
232    assert(n == nBuf);
233    fprintf(stderr,"%d bytes of unencrypted data fed to state machine\n",n);
234    }
235
236int OpenSocket(int nPort)
237    {
238    int nSocket;
239    struct sockaddr_in saServer;
240    struct sockaddr_in saClient;
241    int one=1;
242    int nSize;
243    int nFD;
244    int nLen;
245
246    nSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
247    if(nSocket < 0)
248	{
249	perror("socket");
250	exit(1);
251	}
252
253    if(setsockopt(nSocket,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof one) < 0)
254	{
255	perror("setsockopt");
256        exit(2);
257	}
258
259    memset(&saServer,0,sizeof saServer);
260    saServer.sin_family=AF_INET;
261    saServer.sin_port=htons(nPort);
262    nSize=sizeof saServer;
263    if(bind(nSocket,(struct sockaddr *)&saServer,nSize) < 0)
264	{
265	perror("bind");
266	exit(3);
267	}
268
269    if(listen(nSocket,512) < 0)
270	{
271	perror("listen");
272	exit(4);
273	}
274
275    nLen=sizeof saClient;
276    nFD=accept(nSocket,(struct sockaddr *)&saClient,&nLen);
277    if(nFD < 0)
278	{
279	perror("accept");
280	exit(5);
281	}
282
283    fprintf(stderr,"Incoming accepted on port %d\n",nPort);
284
285    return nFD;
286    }
287
288int main(int argc,char **argv)
289    {
290    SSLStateMachine *pMachine;
291    int nPort;
292    int nFD;
293    const char *szCertificateFile;
294    const char *szKeyFile;
295    char rbuf[1];
296    int nrbuf=0;
297
298    if(argc != 4)
299	{
300	fprintf(stderr,"%s <port> <certificate file> <key file>\n",argv[0]);
301	exit(6);
302	}
303
304    nPort=atoi(argv[1]);
305    szCertificateFile=argv[2];
306    szKeyFile=argv[3];
307
308    SSL_library_init();
309    OpenSSL_add_ssl_algorithms();
310    SSL_load_error_strings();
311    ERR_load_crypto_strings();
312
313    nFD=OpenSocket(nPort);
314
315    pMachine=SSLStateMachine_new(szCertificateFile,szKeyFile);
316
317    for( ; ; )
318	{
319	fd_set rfds,wfds;
320	unsigned char buf[1024];
321	int n;
322
323	FD_ZERO(&rfds);
324	FD_ZERO(&wfds);
325
326	/* Select socket for input */
327	FD_SET(nFD,&rfds);
328
329	/* check whether there's decrypted data */
330	if(!nrbuf)
331	    nrbuf=SSLStateMachine_read_extract(pMachine,rbuf,1);
332
333	/* if there's decrypted data, check whether we can write it */
334	if(nrbuf)
335	    FD_SET(1,&wfds);
336
337	/* Select socket for output */
338	if(SSLStateMachine_write_can_extract(pMachine))
339	    FD_SET(nFD,&wfds);
340
341	/* Select stdin for input */
342	FD_SET(0,&rfds);
343
344	/* Wait for something to do something */
345	n=select(nFD+1,&rfds,&wfds,NULL,NULL);
346	assert(n > 0);
347
348	/* Socket is ready for input */
349	if(FD_ISSET(nFD,&rfds))
350	    {
351	    n=read(nFD,buf,sizeof buf);
352	    if(n == 0)
353		{
354		fprintf(stderr,"Got EOF on socket\n");
355		exit(0);
356		}
357	    assert(n > 0);
358
359	    SSLStateMachine_read_inject(pMachine,buf,n);
360	    }
361
362	/* stdout is ready for output (and hence we have some to send it) */
363	if(FD_ISSET(1,&wfds))
364	    {
365	    assert(nrbuf == 1);
366	    buf[0]=rbuf[0];
367	    nrbuf=0;
368
369	    n=SSLStateMachine_read_extract(pMachine,buf+1,sizeof buf-1);
370	    if(n < 0)
371		{
372		SSLStateMachine_print_error(pMachine,"read extract failed");
373		break;
374		}
375	    assert(n >= 0);
376	    ++n;
377	    if(n > 0) /* FIXME: has to be true now */
378		{
379		int w;
380
381		w=write(1,buf,n);
382		/* FIXME: we should push back any unwritten data */
383		assert(w == n);
384		}
385	    }
386
387	/* Socket is ready for output (and therefore we have output to send) */
388	if(FD_ISSET(nFD,&wfds))
389	    {
390	    int w;
391
392	    n=SSLStateMachine_write_extract(pMachine,buf,sizeof buf);
393	    assert(n > 0);
394
395	    w=write(nFD,buf,n);
396	    /* FIXME: we should push back any unwritten data */
397	    assert(w == n);
398	    }
399
400	/* Stdin is ready for input */
401	if(FD_ISSET(0,&rfds))
402	    {
403	    n=read(0,buf,sizeof buf);
404	    if(n == 0)
405		{
406		fprintf(stderr,"Got EOF on stdin\n");
407		exit(0);
408		}
409	    assert(n > 0);
410
411	    SSLStateMachine_write_inject(pMachine,buf,n);
412	    }
413	}
414    /* not reached */
415    return 0;
416    }
417