Annotation of src/usr.bin/rlogin/des_rw.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: des_rw.c,v 1.2 1995/03/21 07:58:30 cgd Exp $ */
2:
3: /*-
4: * Copyright (c) 1989, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)des_rw.c 8.1 (Berkeley) 6/6/93";
39: #else
40: static char rcsid[] = "$NetBSD: des_rw.c,v 1.2 1995/03/21 07:58:30 cgd Exp $";
41: #endif
42: #endif /* not lint */
43:
44: #ifdef CRYPT
45: #ifdef KERBEROS
46: #include <sys/param.h>
47:
48: #include <kerberosIV/des.h>
49: #include <kerberosIV/krb.h>
50:
51: #include <stdlib.h>
52: #include <string.h>
53: #include <time.h>
54: #include <unistd.h>
55:
56: static unsigned char des_inbuf[10240], storage[10240], *store_ptr;
57: static bit_64 *key;
58: static u_char *key_schedule;
59:
60: /* XXX these should be in a kerberos include file */
61: int krb_net_read __P((int, char *, int));
62: #ifdef notdef
63: /* XXX too hard to make this work */
64: int des_pcbc_encrypt __P((des_cblock *, des_cblock *, long,
65: des_key_schedule, des_cblock *, int));
66: #endif
67:
68: /*
69: * NB: These routines will not function properly if NBIO
70: * is set
71: */
72:
73: /*
74: * des_set_key
75: *
76: * Set des encryption/decryption key for use by the des_read and
77: * des_write routines
78: *
79: * The inkey parameter is actually the DES initial vector,
80: * and the insched is the DES Key unwrapped for faster decryption
81: */
82:
83: void
84: des_set_key(inkey, insched)
85: bit_64 *inkey;
86: u_char *insched;
87: {
88: key = inkey;
89: key_schedule = insched;
90: }
91:
92: void
93: des_clear_key()
94: {
95: bzero((char *) key, sizeof(C_Block));
96: bzero((char *) key_schedule, sizeof(Key_schedule));
97: }
98:
99:
100: int
101: des_read(fd, buf, len)
102: int fd;
103: register char *buf;
104: int len;
105: {
106: int nreturned = 0;
107: long net_len, rd_len;
108: int nstored = 0;
109:
110: if (nstored >= len) {
111: (void) bcopy(store_ptr, buf, len);
112: store_ptr += len;
113: nstored -= len;
114: return(len);
115: } else if (nstored) {
116: (void) bcopy(store_ptr, buf, nstored);
117: nreturned += nstored;
118: buf += nstored;
119: len -= nstored;
120: nstored = 0;
121: }
122:
123: if (krb_net_read(fd, (char *)&net_len, sizeof(net_len)) !=
124: sizeof(net_len)) {
125: /* XXX can't read enough, pipe
126: must have closed */
127: return(0);
128: }
129: net_len = ntohl(net_len);
130: if (net_len <= 0 || net_len > sizeof(des_inbuf)) {
131: /* preposterous length; assume out-of-sync; only
132: recourse is to close connection, so return 0 */
133: return(0);
134: }
135: /* the writer tells us how much real data we are getting, but
136: we need to read the pad bytes (8-byte boundary) */
137: rd_len = roundup(net_len, 8);
138: if (krb_net_read(fd, (char *)des_inbuf, rd_len) != rd_len) {
139: /* pipe must have closed, return 0 */
140: return(0);
141: }
142: (void) des_pcbc_encrypt(des_inbuf, /* inbuf */
143: storage, /* outbuf */
144: net_len, /* length */
145: key_schedule, /* DES key */
146: key, /* IV */
147: DECRYPT); /* direction */
148:
149: if(net_len < 8)
150: store_ptr = storage + 8 - net_len;
151: else
152: store_ptr = storage;
153:
154: nstored = net_len;
155: if (nstored > len) {
156: (void) bcopy(store_ptr, buf, len);
157: nreturned += len;
158: store_ptr += len;
159: nstored -= len;
160: } else {
161: (void) bcopy(store_ptr, buf, nstored);
162: nreturned += nstored;
163: nstored = 0;
164: }
165:
166: return(nreturned);
167: }
168:
169: static unsigned char des_outbuf[10240]; /* > longest write */
170:
171: int
172: des_write(fd, buf, len)
173: int fd;
174: char *buf;
175: int len;
176: {
177: static int seeded = 0;
178: static char garbage_buf[8];
179: long net_len, garbage;
180:
181: if(len < 8) {
182: if(!seeded) {
183: seeded = 1;
184: srandom((int) time((long *)0));
185: }
186: garbage = random();
187: /* insert random garbage */
188: (void) bcopy(&garbage, garbage_buf, MIN(sizeof(long),8));
189: /* this "right-justifies" the data in the buffer */
190: (void) bcopy(buf, garbage_buf + 8 - len, len);
191: }
192: /* pcbc_encrypt outputs in 8-byte (64 bit) increments */
193:
194: (void) des_pcbc_encrypt((len < 8) ? garbage_buf : buf,
195: des_outbuf,
196: (len < 8) ? 8 : len,
197: key_schedule, /* DES key */
198: key, /* IV */
199: ENCRYPT);
200:
201: /* tell the other end the real amount, but send an 8-byte padded
202: packet */
203: net_len = htonl(len);
204: (void) write(fd, &net_len, sizeof(net_len));
205: (void) write(fd, des_outbuf, roundup(len,8));
206: return(len);
207: }
208: #endif /* KERBEROS */
209: #endif /* CRYPT */
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