417 lines
11 KiB
C
417 lines
11 KiB
C
/* ====================================================================
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* Copyright (c) 2000 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/*
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* Nuron, a leader in hardware encryption technology, generously
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* sponsored the development of this demo by Ben Laurie.
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*
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* See http://www.nuron.com/.
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*/
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/*
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* the aim of this demo is to provide a fully working state-machine
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* style SSL implementation, i.e. one where the main loop acquires
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* some data, then converts it from or to SSL by feeding it into the
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* SSL state machine. It then does any I/O required by the state machine
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* and loops.
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*
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* In order to keep things as simple as possible, this implementation
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* listens on a TCP socket, which it expects to get an SSL connection
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* on (for example, from s_client) and from then on writes decrypted
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* data to stdout and encrypts anything arriving on stdin. Verbose
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* commentary is written to stderr.
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*
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* This implementation acts as a server, but it can also be done for a client. */
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#include <openssl/ssl.h>
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#include <assert.h>
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#include <unistd.h>
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#include <string.h>
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#include <openssl/err.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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/* die_unless is intended to work like assert, except that it happens
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always, even if NDEBUG is defined. Use assert as a stopgap. */
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#define die_unless(x) assert(x)
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typedef struct
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{
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SSL_CTX *pCtx;
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BIO *pbioRead;
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BIO *pbioWrite;
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SSL *pSSL;
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} SSLStateMachine;
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void SSLStateMachine_print_error(SSLStateMachine *pMachine,const char *szErr)
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{
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unsigned long l;
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fprintf(stderr,"%s\n",szErr);
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while((l=ERR_get_error()))
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{
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char buf[1024];
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ERR_error_string_n(l,buf,sizeof buf);
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fprintf(stderr,"Error %lx: %s\n",l,buf);
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}
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}
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SSLStateMachine *SSLStateMachine_new(const char *szCertificateFile,
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const char *szKeyFile)
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{
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SSLStateMachine *pMachine=malloc(sizeof *pMachine);
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int n;
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die_unless(pMachine);
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pMachine->pCtx=SSL_CTX_new(SSLv23_server_method());
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die_unless(pMachine->pCtx);
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n=SSL_CTX_use_certificate_file(pMachine->pCtx,szCertificateFile,
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SSL_FILETYPE_PEM);
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die_unless(n > 0);
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n=SSL_CTX_use_PrivateKey_file(pMachine->pCtx,szKeyFile,SSL_FILETYPE_PEM);
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die_unless(n > 0);
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pMachine->pSSL=SSL_new(pMachine->pCtx);
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die_unless(pMachine->pSSL);
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pMachine->pbioRead=BIO_new(BIO_s_mem());
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pMachine->pbioWrite=BIO_new(BIO_s_mem());
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SSL_set_bio(pMachine->pSSL,pMachine->pbioRead,pMachine->pbioWrite);
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SSL_set_accept_state(pMachine->pSSL);
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return pMachine;
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}
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void SSLStateMachine_read_inject(SSLStateMachine *pMachine,
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const unsigned char *aucBuf,int nBuf)
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{
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int n=BIO_write(pMachine->pbioRead,aucBuf,nBuf);
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/* If it turns out this assert fails, then buffer the data here
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* and just feed it in in churn instead. Seems to me that it
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* should be guaranteed to succeed, though.
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*/
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assert(n == nBuf);
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fprintf(stderr,"%d bytes of encrypted data fed to state machine\n",n);
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}
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int SSLStateMachine_read_extract(SSLStateMachine *pMachine,
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unsigned char *aucBuf,int nBuf)
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{
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int n;
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if(!SSL_is_init_finished(pMachine->pSSL))
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{
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fprintf(stderr,"Doing SSL_accept\n");
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n=SSL_accept(pMachine->pSSL);
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if(n == 0)
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fprintf(stderr,"SSL_accept returned zero\n");
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if(n < 0)
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{
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int err;
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if((err=SSL_get_error(pMachine->pSSL,n)) == SSL_ERROR_WANT_READ)
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{
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fprintf(stderr,"SSL_accept wants more data\n");
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return 0;
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}
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SSLStateMachine_print_error(pMachine,"SSL_accept error");
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exit(7);
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}
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return 0;
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}
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n=SSL_read(pMachine->pSSL,aucBuf,nBuf);
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if(n < 0)
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{
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int err=SSL_get_error(pMachine->pSSL,n);
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if(err == SSL_ERROR_WANT_READ)
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{
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fprintf(stderr,"SSL_read wants more data\n");
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return 0;
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}
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SSLStateMachine_print_error(pMachine,"SSL_read error");
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exit(8);
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}
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fprintf(stderr,"%d bytes of decrypted data read from state machine\n",n);
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return n;
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}
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int SSLStateMachine_write_can_extract(SSLStateMachine *pMachine)
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{
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int n=BIO_pending(pMachine->pbioWrite);
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if(n)
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fprintf(stderr,"There is encrypted data available to write\n");
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else
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fprintf(stderr,"There is no encrypted data available to write\n");
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return n;
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}
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int SSLStateMachine_write_extract(SSLStateMachine *pMachine,
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unsigned char *aucBuf,int nBuf)
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{
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int n;
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n=BIO_read(pMachine->pbioWrite,aucBuf,nBuf);
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fprintf(stderr,"%d bytes of encrypted data read from state machine\n",n);
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return n;
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}
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void SSLStateMachine_write_inject(SSLStateMachine *pMachine,
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const unsigned char *aucBuf,int nBuf)
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{
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int n=SSL_write(pMachine->pSSL,aucBuf,nBuf);
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/* If it turns out this assert fails, then buffer the data here
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* and just feed it in in churn instead. Seems to me that it
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* should be guaranteed to succeed, though.
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*/
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assert(n == nBuf);
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fprintf(stderr,"%d bytes of unencrypted data fed to state machine\n",n);
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}
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int OpenSocket(int nPort)
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{
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int nSocket;
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struct sockaddr_in saServer;
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struct sockaddr_in saClient;
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int one=1;
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int nSize;
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int nFD;
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int nLen;
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nSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
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if(nSocket < 0)
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{
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perror("socket");
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exit(1);
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}
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if(setsockopt(nSocket,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof one) < 0)
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{
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perror("setsockopt");
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exit(2);
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}
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memset(&saServer,0,sizeof saServer);
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saServer.sin_family=AF_INET;
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saServer.sin_port=htons(nPort);
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nSize=sizeof saServer;
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if(bind(nSocket,(struct sockaddr *)&saServer,nSize) < 0)
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{
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perror("bind");
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exit(3);
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}
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if(listen(nSocket,512) < 0)
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{
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perror("listen");
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exit(4);
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}
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nLen=sizeof saClient;
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nFD=accept(nSocket,(struct sockaddr *)&saClient,&nLen);
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if(nFD < 0)
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{
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perror("accept");
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exit(5);
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}
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fprintf(stderr,"Incoming accepted on port %d\n",nPort);
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return nFD;
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}
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int main(int argc,char **argv)
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{
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SSLStateMachine *pMachine;
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int nPort;
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int nFD;
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const char *szCertificateFile;
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const char *szKeyFile;
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char rbuf[1];
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int nrbuf=0;
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if(argc != 4)
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{
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fprintf(stderr,"%s <port> <certificate file> <key file>\n",argv[0]);
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exit(6);
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}
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nPort=atoi(argv[1]);
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szCertificateFile=argv[2];
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szKeyFile=argv[3];
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SSL_library_init();
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OpenSSL_add_ssl_algorithms();
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SSL_load_error_strings();
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ERR_load_crypto_strings();
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nFD=OpenSocket(nPort);
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pMachine=SSLStateMachine_new(szCertificateFile,szKeyFile);
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for( ; ; )
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{
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fd_set rfds,wfds;
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unsigned char buf[1024];
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int n;
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FD_ZERO(&rfds);
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FD_ZERO(&wfds);
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/* Select socket for input */
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FD_SET(nFD,&rfds);
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/* check whether there's decrypted data */
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if(!nrbuf)
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nrbuf=SSLStateMachine_read_extract(pMachine,rbuf,1);
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/* if there's decrypted data, check whether we can write it */
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if(nrbuf)
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FD_SET(1,&wfds);
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/* Select socket for output */
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if(SSLStateMachine_write_can_extract(pMachine))
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FD_SET(nFD,&wfds);
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/* Select stdin for input */
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FD_SET(0,&rfds);
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/* Wait for something to do something */
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n=select(nFD+1,&rfds,&wfds,NULL,NULL);
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assert(n > 0);
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/* Socket is ready for input */
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if(FD_ISSET(nFD,&rfds))
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{
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n=read(nFD,buf,sizeof buf);
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if(n == 0)
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{
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fprintf(stderr,"Got EOF on socket\n");
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exit(0);
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}
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assert(n > 0);
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SSLStateMachine_read_inject(pMachine,buf,n);
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}
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/* stdout is ready for output (and hence we have some to send it) */
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if(FD_ISSET(1,&wfds))
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{
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assert(nrbuf == 1);
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buf[0]=rbuf[0];
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nrbuf=0;
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n=SSLStateMachine_read_extract(pMachine,buf+1,sizeof buf-1);
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if(n < 0)
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{
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SSLStateMachine_print_error(pMachine,"read extract failed");
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break;
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}
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assert(n >= 0);
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++n;
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if(n > 0) /* FIXME: has to be true now */
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{
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int w;
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w=write(1,buf,n);
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/* FIXME: we should push back any unwritten data */
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assert(w == n);
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}
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}
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/* Socket is ready for output (and therefore we have output to send) */
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if(FD_ISSET(nFD,&wfds))
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{
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int w;
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n=SSLStateMachine_write_extract(pMachine,buf,sizeof buf);
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assert(n > 0);
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w=write(nFD,buf,n);
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/* FIXME: we should push back any unwritten data */
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assert(w == n);
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}
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/* Stdin is ready for input */
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if(FD_ISSET(0,&rfds))
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{
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n=read(0,buf,sizeof buf);
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if(n == 0)
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{
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fprintf(stderr,"Got EOF on stdin\n");
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exit(0);
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}
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assert(n > 0);
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SSLStateMachine_write_inject(pMachine,buf,n);
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}
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}
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/* not reached */
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return 0;
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}
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