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>
94 void SSLStateMachine_print_error(SSLStateMachine *pMachine,const char *szErr)
98 fprintf(stderr,"%s\n",szErr);
99 while((l=ERR_get_error()))
103 ERR_error_string_n(l,buf,sizeof buf);
104 fprintf(stderr,"Error %lx: %s\n",l,buf);
108 SSLStateMachine *SSLStateMachine_new(const char *szCertificateFile,
109 const char *szKeyFile)
111 SSLStateMachine *pMachine=malloc(sizeof *pMachine);
116 pMachine->pCtx=SSL_CTX_new(SSLv23_server_method());
117 assert(pMachine->pCtx);
119 n=SSL_CTX_use_certificate_file(pMachine->pCtx,szCertificateFile,
123 n=SSL_CTX_use_PrivateKey_file(pMachine->pCtx,szKeyFile,SSL_FILETYPE_PEM);
126 pMachine->pSSL=SSL_new(pMachine->pCtx);
127 assert(pMachine->pSSL);
129 pMachine->pbioRead=BIO_new(BIO_s_mem());
130 /* Set EOF to return 0 (-1 is the default) */
131 BIO_ctrl(pMachine->pbioRead,BIO_C_SET_BUF_MEM_EOF_RETURN,0,NULL);
133 pMachine->pbioWrite=BIO_new(BIO_s_mem());
135 SSL_set_bio(pMachine->pSSL,pMachine->pbioRead,pMachine->pbioWrite);
137 SSL_set_accept_state(pMachine->pSSL);
142 void SSLStateMachine_read_inject(SSLStateMachine *pMachine,
143 const unsigned char *aucBuf,int nBuf)
145 int n=BIO_write(pMachine->pbioRead,aucBuf,nBuf);
146 /* If it turns out this assert fails, then buffer the data here
147 * and just feed it in in churn instead. Seems to me that it
148 * should be guaranteed to succeed, though.
151 fprintf(stderr,"%d bytes of encrypted data fed to state machine\n",n);
154 int SSLStateMachine_read_extract(SSLStateMachine *pMachine,
155 unsigned char *aucBuf,int nBuf)
159 if(!SSL_is_init_finished(pMachine->pSSL))
161 fprintf(stderr,"Doing SSL_accept\n");
162 n=SSL_accept(pMachine->pSSL);
164 SSLStateMachine_print_error(pMachine,"SSL_accept failed");
166 fprintf(stderr,"SSL_accept returned zero\n");
171 n=SSL_read(pMachine->pSSL,aucBuf,nBuf);
172 fprintf(stderr,"%d bytes of decrypted data read from state machine\n",n);
176 int SSLStateMachine_write_can_extract(SSLStateMachine *pMachine)
178 int n=BIO_pending(pMachine->pbioWrite);
180 fprintf(stderr,"There is encrypted data available to write\n");
182 fprintf(stderr,"There is no encrypted data available to write\n");
187 int SSLStateMachine_write_extract(SSLStateMachine *pMachine,
188 unsigned char *aucBuf,int nBuf)
192 n=BIO_read(pMachine->pbioWrite,aucBuf,nBuf);
193 fprintf(stderr,"%d bytes of encrypted data read from state machine\n",n);
197 void SSLStateMachine_write_inject(SSLStateMachine *pMachine,
198 const unsigned char *aucBuf,int nBuf)
200 int n=SSL_write(pMachine->pSSL,aucBuf,nBuf);
201 /* If it turns out this assert fails, then buffer the data here
202 * and just feed it in in churn instead. Seems to me that it
203 * should be guaranteed to succeed, though.
206 fprintf(stderr,"%d bytes of unencrypted data fed to state machine\n",n);
209 int OpenSocket(int nPort)
212 struct sockaddr_in saServer;
213 struct sockaddr_in saClient;
219 nSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
226 if(setsockopt(nSocket,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof one) < 0)
228 perror("setsockopt");
232 memset(&saServer,0,sizeof saServer);
233 saServer.sin_family=AF_INET;
234 saServer.sin_port=htons(nPort);
235 nSize=sizeof saServer;
236 if(bind(nSocket,(struct sockaddr *)&saServer,nSize) < 0)
242 if(listen(nSocket,512) < 0)
248 nLen=sizeof saClient;
249 nFD=accept(nSocket,(struct sockaddr *)&saClient,&nLen);
256 fprintf(stderr,"Incoming accepted on port %d\n",nPort);
261 int main(int argc,char **argv)
263 SSLStateMachine *pMachine;
266 const char *szCertificateFile;
267 const char *szKeyFile;
271 fprintf(stderr,"%s <port> <certificate file> <key file>\n",argv[0]);
276 szCertificateFile=argv[2];
280 OpenSSL_add_ssl_algorithms();
281 SSL_load_error_strings();
282 ERR_load_crypto_strings();
284 nFD=OpenSocket(nPort);
286 pMachine=SSLStateMachine_new(szCertificateFile,szKeyFile);
291 unsigned char buf[1024];
297 /* Select socket for input */
300 /* Select socket for output */
301 if(SSLStateMachine_write_can_extract(pMachine))
304 /* Select stdin for input */
307 /* Wait for something to do something */
308 n=select(nFD+1,&rfds,&wfds,NULL,NULL);
311 /* Socket is ready for input */
312 if(FD_ISSET(nFD,&rfds))
314 n=read(nFD,buf,sizeof buf);
317 fprintf(stderr,"Got EOF on socket\n");
322 SSLStateMachine_read_inject(pMachine,buf,n);
325 /* FIXME: we should only extract if stdout is ready */
326 n=SSLStateMachine_read_extract(pMachine,buf,n);
329 SSLStateMachine_print_error(pMachine,"read extract failed");
338 /* FIXME: we should push back any unwritten data */
342 /* Socket is ready for output (and therefore we have output to send) */
343 if(FD_ISSET(nFD,&wfds))
347 n=SSLStateMachine_write_extract(pMachine,buf,sizeof buf);
351 /* FIXME: we should push back any unwritten data */
355 /* Stdin is ready for input */
356 if(FD_ISSET(0,&rfds))
358 n=read(0,buf,sizeof buf);
361 fprintf(stderr,"Got EOF on stdin\n");
366 SSLStateMachine_write_inject(pMachine,buf,n);