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());
135 /* Set EOF to return 0 (-1 is the default) */
136 BIO_ctrl(pMachine->pbioRead,BIO_C_SET_BUF_MEM_EOF_RETURN,0,NULL);
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);
151 /* If it turns out this assert fails, then buffer the data here
152 * and just feed it in in churn instead. Seems to me that it
153 * should be guaranteed to succeed, though.
156 fprintf(stderr,"%d bytes of encrypted data fed to state machine\n",n);
159 int SSLStateMachine_read_extract(SSLStateMachine *pMachine,
160 unsigned char *aucBuf,int nBuf)
164 if(!SSL_is_init_finished(pMachine->pSSL))
166 fprintf(stderr,"Doing SSL_accept\n");
167 n=SSL_accept(pMachine->pSSL);
169 SSLStateMachine_print_error(pMachine,"SSL_accept failed");
171 fprintf(stderr,"SSL_accept returned zero\n");
176 n=SSL_read(pMachine->pSSL,aucBuf,nBuf);
177 fprintf(stderr,"%d bytes of decrypted data read from state machine\n",n);
181 int SSLStateMachine_write_can_extract(SSLStateMachine *pMachine)
183 int n=BIO_pending(pMachine->pbioWrite);
185 fprintf(stderr,"There is encrypted data available to write\n");
187 fprintf(stderr,"There is no encrypted data available to write\n");
192 int SSLStateMachine_write_extract(SSLStateMachine *pMachine,
193 unsigned char *aucBuf,int nBuf)
197 n=BIO_read(pMachine->pbioWrite,aucBuf,nBuf);
198 fprintf(stderr,"%d bytes of encrypted data read from state machine\n",n);
202 void SSLStateMachine_write_inject(SSLStateMachine *pMachine,
203 const unsigned char *aucBuf,int nBuf)
205 int n=SSL_write(pMachine->pSSL,aucBuf,nBuf);
206 /* If it turns out this assert fails, then buffer the data here
207 * and just feed it in in churn instead. Seems to me that it
208 * should be guaranteed to succeed, though.
211 fprintf(stderr,"%d bytes of unencrypted data fed to state machine\n",n);
214 int OpenSocket(int nPort)
217 struct sockaddr_in saServer;
218 struct sockaddr_in saClient;
224 nSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
231 if(setsockopt(nSocket,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof one) < 0)
233 perror("setsockopt");
237 memset(&saServer,0,sizeof saServer);
238 saServer.sin_family=AF_INET;
239 saServer.sin_port=htons(nPort);
240 nSize=sizeof saServer;
241 if(bind(nSocket,(struct sockaddr *)&saServer,nSize) < 0)
247 if(listen(nSocket,512) < 0)
253 nLen=sizeof saClient;
254 nFD=accept(nSocket,(struct sockaddr *)&saClient,&nLen);
261 fprintf(stderr,"Incoming accepted on port %d\n",nPort);
266 int main(int argc,char **argv)
268 SSLStateMachine *pMachine;
271 const char *szCertificateFile;
272 const char *szKeyFile;
276 fprintf(stderr,"%s <port> <certificate file> <key file>\n",argv[0]);
281 szCertificateFile=argv[2];
285 OpenSSL_add_ssl_algorithms();
286 SSL_load_error_strings();
287 ERR_load_crypto_strings();
289 nFD=OpenSocket(nPort);
291 pMachine=SSLStateMachine_new(szCertificateFile,szKeyFile);
296 unsigned char buf[1024];
302 /* Select socket for input */
305 /* Select socket for output */
306 if(SSLStateMachine_write_can_extract(pMachine))
309 /* Select stdin for input */
312 /* Wait for something to do something */
313 n=select(nFD+1,&rfds,&wfds,NULL,NULL);
316 /* Socket is ready for input */
317 if(FD_ISSET(nFD,&rfds))
319 n=read(nFD,buf,sizeof buf);
322 fprintf(stderr,"Got EOF on socket\n");
327 SSLStateMachine_read_inject(pMachine,buf,n);
330 /* FIXME: we should only extract if stdout is ready */
331 n=SSLStateMachine_read_extract(pMachine,buf,n);
334 SSLStateMachine_print_error(pMachine,"read extract failed");
343 /* FIXME: we should push back any unwritten data */
347 /* Socket is ready for output (and therefore we have output to send) */
348 if(FD_ISSET(nFD,&wfds))
352 n=SSLStateMachine_write_extract(pMachine,buf,sizeof buf);
356 /* FIXME: we should push back any unwritten data */
360 /* Stdin is ready for input */
361 if(FD_ISSET(0,&rfds))
363 n=read(0,buf,sizeof buf);
366 fprintf(stderr,"Got EOF on stdin\n");
371 SSLStateMachine_write_inject(pMachine,buf,n);