129 lines
2.4 KiB
C
129 lines
2.4 KiB
C
|
/*
|
||
|
|
* S/KEY v1.1b (skey.c)
|
||
|
|
*
|
||
|
|
* Authors:
|
||
|
|
* Neil M. Haller <nmh@thumper.bellcore.com>
|
||
|
|
* Philip R. Karn <karn@chicago.qualcomm.com>
|
||
|
|
* John S. Walden <jsw@thumper.bellcore.com>
|
||
|
|
* Scott Chasin <chasin@crimelab.com>
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* Stand-alone program for computing responses to S/Key challenges.
|
||
|
|
* Takes the iteration count and seed as command line args, prompts
|
||
|
|
* for the user's key, and produces both word and hex format responses.
|
||
|
|
*
|
||
|
|
* Usage example:
|
||
|
|
* >skey 88 ka9q2
|
||
|
|
* Enter password:
|
||
|
|
* OMEN US HORN OMIT BACK AHOY
|
||
|
|
* >
|
||
|
|
*
|
||
|
|
* $Id: skey.c,v 1.1 1994/05/24 06:48:02 deraadt Exp $
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <sgtty.h>
|
||
|
|
#include "md4.h"
|
||
|
|
#include "skey.h"
|
||
|
|
|
||
|
|
char *readpass();
|
||
|
|
void usage();
|
||
|
|
|
||
|
|
main(argc, argv)
|
||
|
|
int argc;
|
||
|
|
char *argv[];
|
||
|
|
{
|
||
|
|
int n, cnt, i, pass = 0;
|
||
|
|
char passwd[256], key[8], buf[33], *seed, *slash;
|
||
|
|
extern int optind;
|
||
|
|
extern char *optarg;
|
||
|
|
|
||
|
|
cnt = 1;
|
||
|
|
|
||
|
|
while ((i = getopt(argc, argv, "n:p:")) != EOF) {
|
||
|
|
switch (i) {
|
||
|
|
case 'n':
|
||
|
|
cnt = atoi(optarg);
|
||
|
|
break;
|
||
|
|
case 'p':
|
||
|
|
strcpy(passwd, optarg);
|
||
|
|
pass = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* could be in the form <number>/<seed> */
|
||
|
|
|
||
|
|
if (argc <= optind + 1) {
|
||
|
|
/* look for / in it */
|
||
|
|
if (argc <= optind) {
|
||
|
|
usage(argv[0]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
slash = strchr(argv[optind], '/');
|
||
|
|
if (slash == NULL) {
|
||
|
|
usage(argv[0]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
*slash++ = '\0';
|
||
|
|
seed = slash;
|
||
|
|
|
||
|
|
if ((n = atoi(argv[optind])) < 0) {
|
||
|
|
printf("%s not positive\n", argv[optind]);
|
||
|
|
usage(argv[0]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
|
||
|
|
if ((n = atoi(argv[optind])) < 0) {
|
||
|
|
printf("%s not positive\n", argv[optind]);
|
||
|
|
usage(argv[0]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
seed = argv[++optind];
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get user's secret password */
|
||
|
|
if (!pass) {
|
||
|
|
printf("Enter secret password: ");
|
||
|
|
readpass(passwd, sizeof(passwd));
|
||
|
|
}
|
||
|
|
rip(passwd);
|
||
|
|
|
||
|
|
/* Crunch seed and password into starting key */
|
||
|
|
if (keycrunch(key, seed, passwd) != 0) {
|
||
|
|
fprintf(stderr, "%s: key crunch failed\n", argv[0]);
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
if (cnt == 1) {
|
||
|
|
while (n-- != 0)
|
||
|
|
f(key);
|
||
|
|
printf("%s\n", btoe(buf, key));
|
||
|
|
#ifdef HEXIN
|
||
|
|
printf("%s\n", put8(buf, key));
|
||
|
|
#endif
|
||
|
|
} else {
|
||
|
|
for (i = 0; i <= n - cnt; i++)
|
||
|
|
f(key);
|
||
|
|
for (; i <= n; i++) {
|
||
|
|
#ifdef HEXIN
|
||
|
|
printf("%d: %-29s %s\n", i, btoe(buf, key), put8(buf, key));
|
||
|
|
#else
|
||
|
|
printf("%d: %-29s\n", i, btoe(buf, key));
|
||
|
|
#endif
|
||
|
|
f(key);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
usage(s)
|
||
|
|
char *s;
|
||
|
|
{
|
||
|
|
printf("Usage: %s [-n count] [-p password ] sequence# [/] key\n", s);
|
||
|
|
}
|