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

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 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 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource 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 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	*
	6	* "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
	7	* Reserved. This file contains Original Code and/or Modifications of
	8	* Original Code as defined in and that are subject to the Apple Public
	9	* Source License Version 1.0 (the 'License'). You may not use this file
	10	* except in compliance with the License. Please obtain a copy of the
	11	* License at http://www.apple.com/publicsource and read it before using
	12	* this file.
	13	*
	14	* The Original Code and all software distributed under the License are
	15	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	16	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	17	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	19	* License for the specific language governing rights and limitations
	20	* under the License."
	21	*
	22	* @APPLE_LICENSE_HEADER_END@
	23	*/
	24	/*-
	25	* Copyright (c) 1989, 1993
	26	* The Regents of the University of California. All rights reserved.
	27	*
	28	* Redistribution and use in source and binary forms, with or without
	29	* modification, are permitted provided that the following conditions
	30	* are met:
	31	* 1. Redistributions of source code must retain the above copyright
	32	* notice, this list of conditions and the following disclaimer.
	33	* 2. Redistributions in binary form must reproduce the above copyright
	34	* notice, this list of conditions and the following disclaimer in the
	35	* documentation and/or other materials provided with the distribution.
	36	* 3. All advertising materials mentioning features or use of this software
	37	* must display the following acknowledgement:
	38	* This product includes software developed by the University of
	39	* California, Berkeley and its contributors.
	40	* 4. Neither the name of the University nor the names of its contributors
	41	* may be used to endorse or promote products derived from this software
	42	* without specific prior written permission.
	43	*
	44	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	45	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	46	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	47	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	48	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	49	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	50	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	51	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	52	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	53	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	54	* SUCH DAMAGE.
	55	*/
	56
	57	#ifndef lint
	58	static char sccsid[] = "@(#)des_rw.c 8.1 (Berkeley) 6/6/93";
	59	#endif /* not lint */
	60
	61	#ifdef CRYPT
	62	#ifdef KERBEROS
	63	#include <sys/param.h>
	64
65	#include <kerberosIV/des.h>
66	#include <kerberosIV/krb.h>
67
68	#include <stdlib.h>
69	#include <string.h>
70	#include <time.h>
71	#include <unistd.h>
72
73	static unsigned char des_inbuf[10240], storage[10240], *store_ptr;
74	static bit_64 *key;
75	static u_char *key_schedule;
76
77	/* XXX these should be in a kerberos include file */
78	int krb_net_read __P((int, char *, int));
79	#ifdef notdef
80	/* XXX too hard to make this work */
81	int des_pcbc_encrypt __P((des_cblock , des_cblock , long,
82	des_key_schedule, des_cblock *, int));
83	#endif
84
85	/*
86	* NB: These routines will not function properly if NBIO
87	* is set
88	*/
89
90	/*
91	* des_set_key
92	*
93	* Set des encryption/decryption key for use by the des_read and
94	* des_write routines
95	*
96	* The inkey parameter is actually the DES initial vector,
97	* and the insched is the DES Key unwrapped for faster decryption
98	*/
99
100	void
101	des_set_key(inkey, insched)
102	bit_64 *inkey;
103	u_char *insched;
104	{
105	key = inkey;
106	key_schedule = insched;
107	}
108
109	void
110	des_clear_key()
111	{
112	bzero((char *) key, sizeof(C_Block));
113	bzero((char *) key_schedule, sizeof(Key_schedule));
114	}
115
116
117	int
118	des_read(fd, buf, len)
119	int fd;
120	register char *buf;
121	int len;
122	{
123	int nreturned = 0;
124	long net_len, rd_len;
125	int nstored = 0;
126
127	if (nstored >= len) {
128	(void) bcopy(store_ptr, buf, len);
129	store_ptr += len;
130	nstored -= len;
131	return(len);
132	} else if (nstored) {
133	(void) bcopy(store_ptr, buf, nstored);
134	nreturned += nstored;
135	buf += nstored;
136	len -= nstored;
137	nstored = 0;
138	}
139
140	if (krb_net_read(fd, (char *)&net_len, sizeof(net_len)) !=
141	sizeof(net_len)) {
142	/* XXX can't read enough, pipe
143	must have closed */
144	return(0);
145	}
146	net_len = ntohl(net_len);
147	if (net_len <= 0 \|\| net_len > sizeof(des_inbuf)) {
148	/* preposterous length; assume out-of-sync; only
149	recourse is to close connection, so return 0 */
150	return(0);
151	}
152	/* the writer tells us how much real data we are getting, but
153	we need to read the pad bytes (8-byte boundary) */
154	rd_len = roundup(net_len, 8);
155	if (krb_net_read(fd, (char *)des_inbuf, rd_len) != rd_len) {
156	/* pipe must have closed, return 0 */
157	return(0);
158	}
159	(void) des_pcbc_encrypt(des_inbuf, /* inbuf */
160	storage, /* outbuf */
161	net_len, /* length */
162	key_schedule, /* DES key */
163	key, /* IV */
164	DECRYPT); /* direction */
165
166	if(net_len < 8)
167	store_ptr = storage + 8 - net_len;
168	else
169	store_ptr = storage;
170
171	nstored = net_len;
172	if (nstored > len) {
173	(void) bcopy(store_ptr, buf, len);
174	nreturned += len;
175	store_ptr += len;
176	nstored -= len;
177	} else {
178	(void) bcopy(store_ptr, buf, nstored);
179	nreturned += nstored;
180	nstored = 0;
181	}
182
183	return(nreturned);
184	}
185
186	static unsigned char des_outbuf[10240]; /* > longest write */
187
188	int
189	des_write(fd, buf, len)
190	int fd;
191	char *buf;
192	int len;
193	{
194	static int seeded = 0;
195	static char garbage_buf[8];
196	long net_len, garbage;
197
198	if(len < 8) {
199	if(!seeded) {
200	seeded = 1;
201	srandom((int) time((long *)0));
202	}
203	garbage = random();
204	/* insert random garbage */
205	(void) bcopy(&garbage, garbage_buf, MIN(sizeof(long),8));
206	/* this "right-justifies" the data in the buffer */
207	(void) bcopy(buf, garbage_buf + 8 - len, len);
208	}
209	/* pcbc_encrypt outputs in 8-byte (64 bit) increments */
210
211	(void) des_pcbc_encrypt((len < 8) ? garbage_buf : buf,
212	des_outbuf,
213	(len < 8) ? 8 : len,
214	key_schedule, /* DES key */
215	key, /* IV */
216	ENCRYPT);
217
218	/* tell the other end the real amount, but send an 8-byte padded
219	packet */
220	net_len = htonl(len);
221	(void) write(fd, &net_len, sizeof(net_len));
222	(void) write(fd, des_outbuf, roundup(len,8));
223	return(len);
224	}
225	#endif /* KERBEROS */
226	#endif /* CRYPT */