[apple/network_cmds.git] / rlogin.tproj / des_rw.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)des_rw.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

#ifdef CRYPT
#ifdef KERBEROS
#include <sys/param.h>

#include <kerberosIV/des.h>
#include <kerberosIV/krb.h>

#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

static unsigned char	des_inbuf[10240], storage[10240], *store_ptr;
static bit_64		*key;
static u_char		*key_schedule;

/* XXX these should be in a kerberos include file */
int	krb_net_read __P((int, char *, int));
#ifdef notdef
/* XXX too hard to make this work */
int	des_pcbc_encrypt __P((des_cblock *, des_cblock *, long,
	    des_key_schedule, des_cblock *, int));
#endif

/*
 * NB: These routines will not function properly if NBIO
 * 	is set
 */

/*
 * des_set_key
 *
 * Set des encryption/decryption key for use by the des_read and
 * des_write routines
 *
 * The inkey parameter is actually the DES initial vector,
 * and the insched is the DES Key unwrapped for faster decryption
 */

void
des_set_key(inkey, insched)
	bit_64		*inkey;
	u_char		*insched;
{
	key = inkey;
	key_schedule = insched;
}

void
des_clear_key()
{
	bzero((char *) key, sizeof(C_Block));
	bzero((char *) key_schedule, sizeof(Key_schedule));
}
	

int
des_read(fd, buf, len)
	int fd;
	register char *buf;
	int len;
{
	int nreturned = 0;
	long net_len, rd_len;
	int nstored = 0;

	if (nstored >= len) {
		(void) bcopy(store_ptr, buf, len);
		store_ptr += len;
		nstored -= len;
		return(len);
	} else if (nstored) {
		(void) bcopy(store_ptr, buf, nstored);
		nreturned += nstored;
		buf += nstored;
		len -= nstored;
		nstored = 0;
	}
	
	if (krb_net_read(fd, (char *)&net_len, sizeof(net_len)) !=
	    sizeof(net_len)) {
		/* XXX can't read enough, pipe
		   must have closed */
		return(0);
	}
	net_len = ntohl(net_len);
	if (net_len <= 0 || net_len > sizeof(des_inbuf)) {
		/* preposterous length; assume out-of-sync; only
		   recourse is to close connection, so return 0 */
		return(0);
	}
	/* the writer tells us how much real data we are getting, but
	   we need to read the pad bytes (8-byte boundary) */
	rd_len = roundup(net_len, 8);
	if (krb_net_read(fd, (char *)des_inbuf, rd_len) != rd_len) {
		/* pipe must have closed, return 0 */
		return(0);
	}
	(void) des_pcbc_encrypt(des_inbuf,	/* inbuf */
			    storage,		/* outbuf */
			    net_len,		/* length */
			    key_schedule,	/* DES key */
			    key,		/* IV */
			    DECRYPT);		/* direction */

	if(net_len < 8)
		store_ptr = storage + 8 - net_len;
	else
		store_ptr = storage;

	nstored = net_len;
	if (nstored > len) {
		(void) bcopy(store_ptr, buf, len);
		nreturned += len;
		store_ptr += len;
		nstored -= len;
	} else {
		(void) bcopy(store_ptr, buf, nstored);
		nreturned += nstored;
		nstored = 0;
	}
	
	return(nreturned);
}

static	unsigned char des_outbuf[10240];	/* > longest write */

int
des_write(fd, buf, len)
	int fd;
	char *buf;
	int len;
{
	static	int	seeded = 0;
	static	char	garbage_buf[8];
	long net_len, garbage;

	if(len < 8) {
		if(!seeded) {
			seeded = 1;
			srandom((int) time((long *)0));
		}
		garbage = random();
		/* insert random garbage */
		(void) bcopy(&garbage, garbage_buf, MIN(sizeof(long),8));
		/* this "right-justifies" the data in the buffer */
		(void) bcopy(buf, garbage_buf + 8 - len, len);
	}
	/* pcbc_encrypt outputs in 8-byte (64 bit) increments */

	(void) des_pcbc_encrypt((len < 8) ? garbage_buf : buf,
			    des_outbuf,
			    (len < 8) ? 8 : len,
			    key_schedule,	/* DES key */
			    key,		/* IV */
			    ENCRYPT);

	/* tell the other end the real amount, but send an 8-byte padded
	   packet */
	net_len = htonl(len);
	(void) write(fd, &net_len, sizeof(net_len));
	(void) write(fd, des_outbuf, roundup(len,8));
	return(len);
}
#endif /* KERBEROS */
#endif /* CRYPT */
Commit	Line	Data
b7080c8e A	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
07f47057 A	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
	7	*
	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
b7080c8e A	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
07f47057 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
b7080c8e A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*-
	26	* Copyright (c) 1989, 1993
	27	* The Regents of the University of California. All rights reserved.
	28	*
	29	* Redistribution and use in source and binary forms, with or without
	30	* modification, are permitted provided that the following conditions
	31	* are met:
	32	* 1. Redistributions of source code must retain the above copyright
	33	* notice, this list of conditions and the following disclaimer.
	34	* 2. Redistributions in binary form must reproduce the above copyright
	35	* notice, this list of conditions and the following disclaimer in the
	36	* documentation and/or other materials provided with the distribution.
	37	* 3. All advertising materials mentioning features or use of this software
	38	* must display the following acknowledgement:
	39	* This product includes software developed by the University of
	40	* California, Berkeley and its contributors.
	41	* 4. Neither the name of the University nor the names of its contributors
	42	* may be used to endorse or promote products derived from this software
	43	* without specific prior written permission.
	44	*
	45	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	46	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	47	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	48	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	49	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	50	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	51	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	52	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	53	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	54	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	55	* SUCH DAMAGE.
	56	*/
	57
	58	#ifndef lint
	59	static char sccsid[] = "@(#)des_rw.c 8.1 (Berkeley) 6/6/93";
	60	#endif /* not lint */
	61
	62	#ifdef CRYPT
	63	#ifdef KERBEROS
	64	#include <sys/param.h>
	65
	66	#include <kerberosIV/des.h>
	67	#include <kerberosIV/krb.h>
	68
	69	#include <stdlib.h>
	70	#include <string.h>
	71	#include <time.h>
	72	#include <unistd.h>
	73
	74	static unsigned char des_inbuf[10240], storage[10240], *store_ptr;
	75	static bit_64 *key;
	76	static u_char *key_schedule;
	77
	78	/* XXX these should be in a kerberos include file */
	79	int krb_net_read __P((int, char *, int));
	80	#ifdef notdef
	81	/* XXX too hard to make this work */
	82	int des_pcbc_encrypt __P((des_cblock , des_cblock , long,
	83	des_key_schedule, des_cblock *, int));
	84	#endif
	85
86	/*
87	* NB: These routines will not function properly if NBIO
88	* is set
89	*/
90
91	/*
92	* des_set_key
93	*
94	* Set des encryption/decryption key for use by the des_read and
95	* des_write routines
96	*
97	* The inkey parameter is actually the DES initial vector,
98	* and the insched is the DES Key unwrapped for faster decryption
99	*/
100
101	void
102	des_set_key(inkey, insched)
103	bit_64 *inkey;
104	u_char *insched;
105	{
106	key = inkey;
107	key_schedule = insched;
108	}
109
110	void
111	des_clear_key()
112	{
113	bzero((char *) key, sizeof(C_Block));
114	bzero((char *) key_schedule, sizeof(Key_schedule));
115	}
116
117
118	int
119	des_read(fd, buf, len)
120	int fd;
121	register char *buf;
122	int len;
123	{
124	int nreturned = 0;
125	long net_len, rd_len;
126	int nstored = 0;
127
128	if (nstored >= len) {
129	(void) bcopy(store_ptr, buf, len);
130	store_ptr += len;
131	nstored -= len;
132	return(len);
133	} else if (nstored) {
134	(void) bcopy(store_ptr, buf, nstored);
135	nreturned += nstored;
136	buf += nstored;
137	len -= nstored;
138	nstored = 0;
139	}
140
141	if (krb_net_read(fd, (char *)&net_len, sizeof(net_len)) !=
142	sizeof(net_len)) {
143	/* XXX can't read enough, pipe
144	must have closed */
145	return(0);
146	}
147	net_len = ntohl(net_len);
148	if (net_len <= 0 \|\| net_len > sizeof(des_inbuf)) {
149	/* preposterous length; assume out-of-sync; only
150	recourse is to close connection, so return 0 */
151	return(0);
152	}
153	/* the writer tells us how much real data we are getting, but
154	we need to read the pad bytes (8-byte boundary) */
155	rd_len = roundup(net_len, 8);
156	if (krb_net_read(fd, (char *)des_inbuf, rd_len) != rd_len) {
157	/* pipe must have closed, return 0 */
158	return(0);
159	}
160	(void) des_pcbc_encrypt(des_inbuf, /* inbuf */
161	storage, /* outbuf */
162	net_len, /* length */
163	key_schedule, /* DES key */
164	key, /* IV */
165	DECRYPT); /* direction */
166
167	if(net_len < 8)
168	store_ptr = storage + 8 - net_len;
169	else
170	store_ptr = storage;
171
172	nstored = net_len;
173	if (nstored > len) {
174	(void) bcopy(store_ptr, buf, len);
175	nreturned += len;
176	store_ptr += len;
177	nstored -= len;
178	} else {
179	(void) bcopy(store_ptr, buf, nstored);
180	nreturned += nstored;
181	nstored = 0;
182	}
183
184	return(nreturned);
185	}
186
187	static unsigned char des_outbuf[10240]; /* > longest write */
188
189	int
190	des_write(fd, buf, len)
191	int fd;
192	char *buf;
193	int len;
194	{
195	static int seeded = 0;
196	static char garbage_buf[8];
197	long net_len, garbage;
198
199	if(len < 8) {
200	if(!seeded) {
201	seeded = 1;
202	srandom((int) time((long *)0));
203	}
204	garbage = random();
205	/* insert random garbage */
206	(void) bcopy(&garbage, garbage_buf, MIN(sizeof(long),8));
207	/* this "right-justifies" the data in the buffer */
208	(void) bcopy(buf, garbage_buf + 8 - len, len);
209	}
210	/* pcbc_encrypt outputs in 8-byte (64 bit) increments */
211
212	(void) des_pcbc_encrypt((len < 8) ? garbage_buf : buf,
213	des_outbuf,
214	(len < 8) ? 8 : len,
215	key_schedule, /* DES key */
216	key, /* IV */
217	ENCRYPT);
218
219	/* tell the other end the real amount, but send an 8-byte padded
220	packet */
221	net_len = htonl(len);
222	(void) write(fd, &net_len, sizeof(net_len));
223	(void) write(fd, des_outbuf, roundup(len,8));
224	return(len);
225	}
226	#endif /* KERBEROS */
227	#endif /* CRYPT */