Annotation of src/usr.bin/rsh/des_rw.c, Revision 1.1
1.1 ! deraadt 1: /* $OpenBSD: des_rw.c,v 1.10 2002/02/16 21:27:51 millert Exp $ */
! 2: /* $NetBSD: des_rw.c,v 1.2 1995/03/21 07:58:30 cgd Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1989, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by the University of
! 19: * California, Berkeley and its contributors.
! 20: * 4. Neither the name of the University nor the names of its contributors
! 21: * may be used to endorse or promote products derived from this software
! 22: * without specific prior written permission.
! 23: *
! 24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 34: * SUCH DAMAGE.
! 35: */
! 36:
! 37: #ifndef lint
! 38: #if 0
! 39: static char sccsid[] = "@(#)des_rw.c 8.1 (Berkeley) 6/6/93";
! 40: #else
! 41: static char rcsid[] = "$OpenBSD: des_rw.c,v 1.10 2002/02/16 21:27:51 millert Exp $";
! 42: #endif
! 43: #endif /* not lint */
! 44:
! 45: #ifdef KERBEROS
! 46: #include <sys/param.h>
! 47:
! 48: #include <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: void desrw_set_key(des_cblock *, des_key_schedule *);
! 57: void desrw_clear_key(void);
! 58: int des_read(int, char *, int);
! 59: int des_write(int, char *, int);
! 60:
! 61: static unsigned char des_inbuf[10240], storage[10240], *store_ptr;
! 62: static des_cblock *key;
! 63: static des_key_schedule *key_schedule;
! 64:
! 65: /*
! 66: * NB: These routines will not function properly if NBIO
! 67: * is set
! 68: */
! 69:
! 70: /*
! 71: * des_set_key
! 72: *
! 73: * Set des encryption/decryption key for use by the des_read and
! 74: * des_write routines
! 75: *
! 76: * The inkey parameter is actually the DES initial vector,
! 77: * and the insched is the DES Key unwrapped for faster decryption
! 78: */
! 79: static int nstored = 0;
! 80:
! 81: void
! 82: desrw_set_key(inkey, insched)
! 83: des_cblock *inkey;
! 84: des_key_schedule*insched;
! 85: {
! 86: key = inkey;
! 87: key_schedule = insched;
! 88: nstored = 0;
! 89: }
! 90:
! 91: void
! 92: desrw_clear_key()
! 93: {
! 94: bzero((char *) key, sizeof(C_Block));
! 95: bzero((char *) key_schedule, sizeof(Key_schedule));
! 96: }
! 97:
! 98:
! 99: int
! 100: des_read(fd, buf, len)
! 101: int fd;
! 102: char *buf;
! 103: int len;
! 104: {
! 105: long net_len, rd_len;
! 106: int nreturned = 0;
! 107:
! 108: if (nstored >= len) {
! 109: (void) bcopy(store_ptr, buf, len);
! 110: store_ptr += len;
! 111: nstored -= len;
! 112: return(len);
! 113: } else if (nstored) {
! 114: (void) bcopy(store_ptr, buf, nstored);
! 115: nreturned += nstored;
! 116: buf += nstored;
! 117: len -= nstored;
! 118: nstored = 0;
! 119: }
! 120:
! 121: if (krb_net_read(fd, (char *)&net_len, sizeof(net_len)) !=
! 122: sizeof(net_len)) {
! 123: /* XXX can't read enough, pipe
! 124: must have closed */
! 125: return(0);
! 126: }
! 127: net_len = ntohl(net_len);
! 128: if (net_len <= 0 || net_len > sizeof(des_inbuf)) {
! 129: /* preposterous length; assume out-of-sync; only
! 130: recourse is to close connection, so return 0 */
! 131: return(0);
! 132: }
! 133: /* the writer tells us how much real data we are getting, but
! 134: we need to read the pad bytes (8-byte boundary) */
! 135: rd_len = roundup(net_len, 8);
! 136: if (krb_net_read(fd, (char *)des_inbuf, rd_len) != rd_len) {
! 137: /* pipe must have closed, return 0 */
! 138: return(0);
! 139: }
! 140: (void) des_pcbc_encrypt((des_cblock *)des_inbuf, /* inbuf */
! 141: (des_cblock *)storage, /* outbuf */
! 142: rd_len, /* length */
! 143: *key_schedule, /* DES key */
! 144: key, /* IV */
! 145: DECRYPT); /* direction */
! 146:
! 147: if(net_len < 8)
! 148: store_ptr = storage + 8 - net_len;
! 149: else
! 150: store_ptr = storage;
! 151:
! 152: nstored = net_len;
! 153: if (nstored > len) {
! 154: (void) bcopy(store_ptr, buf, len);
! 155: nreturned += len;
! 156: store_ptr += len;
! 157: nstored -= len;
! 158: } else {
! 159: (void) bcopy(store_ptr, buf, nstored);
! 160: nreturned += nstored;
! 161: nstored = 0;
! 162: }
! 163:
! 164: return(nreturned);
! 165: }
! 166:
! 167: static unsigned char des_outbuf[10240]; /* > longest write */
! 168:
! 169: int
! 170: des_write(fd, buf, len)
! 171: int fd;
! 172: char *buf;
! 173: int len;
! 174: {
! 175: static int seeded = 0;
! 176: static char garbage_buf[8];
! 177: long net_len, garbage;
! 178:
! 179: if(len < 8) {
! 180: if(!seeded) {
! 181: seeded = 1;
! 182: srandom((int) time(NULL));
! 183: }
! 184: garbage = random();
! 185: /* insert random garbage */
! 186: (void) bcopy(&garbage, garbage_buf, MIN(sizeof(long),8));
! 187: /* this "right-justifies" the data in the buffer */
! 188: (void) bcopy(buf, garbage_buf + 8 - len, len);
! 189: }
! 190: /* pcbc_encrypt outputs in 8-byte (64 bit) increments */
! 191:
! 192: (void) des_pcbc_encrypt((des_cblock *)((len < 8) ? garbage_buf : buf),
! 193: (des_cblock *)des_outbuf,
! 194: (len < 8) ? 8 : len,
! 195: *key_schedule, /* DES key */
! 196: key, /* IV */
! 197: ENCRYPT);
! 198:
! 199: /* tell the other end the real amount, but send an 8-byte padded
! 200: packet */
! 201: net_len = htonl(len);
! 202: (void) write(fd, &net_len, sizeof(net_len));
! 203: (void) write(fd, des_outbuf, roundup(len,8));
! 204: return(len);
! 205: }
! 206: #endif /* KERBEROS */
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