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>
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. */
89 #define die_unless(x) assert(x)
99 void SSLStateMachine_print_error(SSLStateMachine *pMachine,const char *szErr)
103 fprintf(stderr,"%s\n",szErr);
104 while((l=ERR_get_error()))
108 ERR_error_string_n(l,buf,sizeof buf);
109 fprintf(stderr,"Error %lx: %s\n",l,buf);
113 SSLStateMachine *SSLStateMachine_new(const char *szCertificateFile,
114 const char *szKeyFile)
116 SSLStateMachine *pMachine=malloc(sizeof *pMachine);
119 die_unless(pMachine);
121 pMachine->pCtx=SSL_CTX_new(SSLv23_server_method());
122 die_unless(pMachine->pCtx);
124 n=SSL_CTX_use_certificate_file(pMachine->pCtx,szCertificateFile,
128 n=SSL_CTX_use_PrivateKey_file(pMachine->pCtx,szKeyFile,SSL_FILETYPE_PEM);
131 pMachine->pSSL=SSL_new(pMachine->pCtx);
132 die_unless(pMachine->pSSL);
134 pMachine->pbioRead=BIO_new(BIO_s_mem());
136 pMachine->pbioWrite=BIO_new(BIO_s_mem());
138 SSL_set_bio(pMachine->pSSL,pMachine->pbioRead,pMachine->pbioWrite);
140 SSL_set_accept_state(pMachine->pSSL);
145 void SSLStateMachine_read_inject(SSLStateMachine *pMachine,
146 const unsigned char *aucBuf,int nBuf)
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.
154 fprintf(stderr,"%d bytes of encrypted data fed to state machine\n",n);
157 int SSLStateMachine_read_extract(SSLStateMachine *pMachine,
158 unsigned char *aucBuf,int nBuf)
162 if(!SSL_is_init_finished(pMachine->pSSL))
164 fprintf(stderr,"Doing SSL_accept\n");
165 n=SSL_accept(pMachine->pSSL);
167 fprintf(stderr,"SSL_accept returned zero\n");
172 if((err=SSL_get_error(pMachine->pSSL,n)) == SSL_ERROR_WANT_READ)
174 fprintf(stderr,"SSL_accept wants more data\n");
178 SSLStateMachine_print_error(pMachine,"SSL_accept error");
184 n=SSL_read(pMachine->pSSL,aucBuf,nBuf);
187 int err=SSL_get_error(pMachine->pSSL,n);
189 if(err == SSL_ERROR_WANT_READ)
191 fprintf(stderr,"SSL_read wants more data\n");
196 fprintf(stderr,"%d bytes of decrypted data read from state machine\n",n);
200 int SSLStateMachine_write_can_extract(SSLStateMachine *pMachine)
202 int n=BIO_pending(pMachine->pbioWrite);
204 fprintf(stderr,"There is encrypted data available to write\n");
206 fprintf(stderr,"There is no encrypted data available to write\n");
211 int SSLStateMachine_write_extract(SSLStateMachine *pMachine,
212 unsigned char *aucBuf,int nBuf)
216 n=BIO_read(pMachine->pbioWrite,aucBuf,nBuf);
217 fprintf(stderr,"%d bytes of encrypted data read from state machine\n",n);
221 void SSLStateMachine_write_inject(SSLStateMachine *pMachine,
222 const unsigned char *aucBuf,int nBuf)
224 int n=SSL_write(pMachine->pSSL,aucBuf,nBuf);
225 /* If it turns out this assert fails, then buffer the data here
226 * and just feed it in in churn instead. Seems to me that it
227 * should be guaranteed to succeed, though.
230 fprintf(stderr,"%d bytes of unencrypted data fed to state machine\n",n);
233 int OpenSocket(int nPort)
236 struct sockaddr_in saServer;
237 struct sockaddr_in saClient;
243 nSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
250 if(setsockopt(nSocket,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof one) < 0)
252 perror("setsockopt");
256 memset(&saServer,0,sizeof saServer);
257 saServer.sin_family=AF_INET;
258 saServer.sin_port=htons(nPort);
259 nSize=sizeof saServer;
260 if(bind(nSocket,(struct sockaddr *)&saServer,nSize) < 0)
266 if(listen(nSocket,512) < 0)
272 nLen=sizeof saClient;
273 nFD=accept(nSocket,(struct sockaddr *)&saClient,&nLen);
280 fprintf(stderr,"Incoming accepted on port %d\n",nPort);
285 int main(int argc,char **argv)
287 SSLStateMachine *pMachine;
290 const char *szCertificateFile;
291 const char *szKeyFile;
295 fprintf(stderr,"%s <port> <certificate file> <key file>\n",argv[0]);
300 szCertificateFile=argv[2];
304 OpenSSL_add_ssl_algorithms();
305 SSL_load_error_strings();
306 ERR_load_crypto_strings();
308 nFD=OpenSocket(nPort);
310 pMachine=SSLStateMachine_new(szCertificateFile,szKeyFile);
315 unsigned char buf[1024];
321 /* Select socket for input */
324 /* Select socket for output */
325 if(SSLStateMachine_write_can_extract(pMachine))
328 /* Select stdin for input */
331 /* Wait for something to do something */
332 n=select(nFD+1,&rfds,&wfds,NULL,NULL);
335 /* Socket is ready for input */
336 if(FD_ISSET(nFD,&rfds))
338 n=read(nFD,buf,sizeof buf);
341 fprintf(stderr,"Got EOF on socket\n");
346 SSLStateMachine_read_inject(pMachine,buf,n);
349 /* FIXME: we should only extract if stdout is ready */
350 n=SSLStateMachine_read_extract(pMachine,buf,sizeof buf);
353 SSLStateMachine_print_error(pMachine,"read extract failed");
362 /* FIXME: we should push back any unwritten data */
366 /* Socket is ready for output (and therefore we have output to send) */
367 if(FD_ISSET(nFD,&wfds))
371 n=SSLStateMachine_write_extract(pMachine,buf,sizeof buf);
375 /* FIXME: we should push back any unwritten data */
379 /* Stdin is ready for input */
380 if(FD_ISSET(0,&rfds))
382 n=read(0,buf,sizeof buf);
385 fprintf(stderr,"Got EOF on stdin\n");
390 SSLStateMachine_write_inject(pMachine,buf,n);