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1.8 ! millert 1: /* * $OpenBSD: skey.c,v 1.7 1996/10/30 01:09:23 millert Exp $*/
1.1 deraadt 2: /*
3: * S/KEY v1.1b (skey.c)
4: *
5: * Authors:
6: * Neil M. Haller <nmh@thumper.bellcore.com>
7: * Philip R. Karn <karn@chicago.qualcomm.com>
8: * John S. Walden <jsw@thumper.bellcore.com>
9: * Scott Chasin <chasin@crimelab.com>
10: *
11: *
12: * Stand-alone program for computing responses to S/Key challenges.
13: * Takes the iteration count and seed as command line args, prompts
14: * for the user's key, and produces both word and hex format responses.
15: *
16: * Usage example:
17: * >skey 88 ka9q2
18: * Enter password:
19: * OMEN US HORN OMIT BACK AHOY
20: * >
21: *
22: */
23:
24: #include <stdio.h>
25: #include <stdlib.h>
26: #include <string.h>
1.3 millert 27: #include <err.h>
28: #include <unistd.h>
29: #include <skey.h>
1.1 deraadt 30:
31: void usage __P((char *));
32:
33: int
34: main(argc, argv)
35: int argc;
36: char *argv[];
37: {
1.3 millert 38: int n, i, cnt = 1, pass = 0, hexmode = 0;
1.8 ! millert 39: char passwd[SKEY_MAX_PW_LEN+1], key[SKEY_BINKEY_SIZE];
! 40: char buf[33], *seed, *slash;
1.1 deraadt 41:
1.5 millert 42: /* If we were called as otp-METHOD, set algorithm based on that */
43: if (strncmp(argv[0], "otp-", 4) == 0) {
44: if (skey_set_algorithm(&argv[0][4]) == NULL)
45: errx(1, "Unknown hash algorithm %s", &argv[0][4]);
1.1 deraadt 46: }
47:
1.5 millert 48: for (i = 1; i < argc && argv[i][0] == '-' && strcmp(argv[i], "--");) {
49: if (argv[i][2] == '\0') {
50: /* Single character switch */
51: switch (argv[i][1]) {
52: case 'n':
53: if (i + 1 == argc)
54: usage(argv[0]);
55: cnt = atoi(argv[++i]);
56: break;
57: case 'p':
58: if (i + 1 == argc)
59: usage(argv[0]);
60: (void)strcpy(passwd, argv[++i]);
61: pass = 1;
62: break;
63: case 'x':
64: hexmode = 1;
65: break;
66: default:
67: usage(argv[0]);
68: }
69: } else {
70: /* Multi character switches are hash types */
71: if (skey_set_algorithm(&argv[i][1]) == NULL) {
72: warnx("Unknown hash algorithm %s", &argv[i][1]);
73: usage(argv[0]);
74: }
1.4 millert 75: }
1.5 millert 76: i++;
1.4 millert 77: }
1.7 millert 78:
79: if (argc > i + 2)
80: usage(argv[0]);
1.4 millert 81:
1.5 millert 82: /* Could be in the form <number>/<seed> */
83: if (argc <= i + 1) {
1.1 deraadt 84: /* look for / in it */
1.5 millert 85: if (argc <= i)
1.1 deraadt 86: usage(argv[0]);
1.5 millert 87: slash = strchr(argv[i], '/');
1.1 deraadt 88: if (slash == NULL)
89: usage(argv[0]);
90: *slash++ = '\0';
91: seed = slash;
92:
1.5 millert 93: if ((n = atoi(argv[i])) < 0) {
1.8 ! millert 94: warnx("%d not positive", n);
! 95: usage(argv[0]);
! 96: } else if (n > SKEY_MAX_SEQ) {
! 97: warnx("%d is larger than max (%d)", n, SKEY_MAX_SEQ);
1.1 deraadt 98: usage(argv[0]);
99: }
100: } else {
1.5 millert 101: if ((n = atoi(argv[i])) < 0) {
102: warnx("%s not positive", argv[i]);
1.8 ! millert 103: usage(argv[0]);
! 104: } else if (n > SKEY_MAX_SEQ) {
! 105: warnx("%d is larger than max (%d)", n, SKEY_MAX_SEQ);
1.1 deraadt 106: usage(argv[0]);
107: }
1.5 millert 108: seed = argv[++i];
1.1 deraadt 109: }
110:
111: /* Get user's secret password */
112: if (!pass) {
1.3 millert 113: (void)fputs("Reminder - Do not use this program while logged in via telnet or rlogin.\n", stderr);
114: (void)fputs("Enter secret password: ", stderr);
1.1 deraadt 115: readpass(passwd, sizeof(passwd));
1.6 millert 116: if (passwd[0] == '\0')
117: exit(1);
1.1 deraadt 118: }
119:
120: /* Crunch seed and password into starting key */
1.3 millert 121: if (keycrunch(key, seed, passwd) != 0)
122: errx(1, "key crunch failed");
123:
1.1 deraadt 124: if (cnt == 1) {
125: while (n-- != 0)
126: f(key);
1.3 millert 127: (void)puts(hexmode ? put8(buf, key) : btoe(buf, key));
1.1 deraadt 128: } else {
129: for (i = 0; i <= n - cnt; i++)
130: f(key);
131: for (; i <= n; i++) {
1.3 millert 132: if (hexmode)
133: (void)printf("%d: %-29s %s\n", i,
134: btoe(buf, key), put8(buf, key));
135: else
136: (void)printf("%d: %-29s\n", i, btoe(buf, key));
1.1 deraadt 137: f(key);
138: }
139: }
140: exit(0);
141: }
142:
143: void
144: usage(s)
145: char *s;
146: {
1.5 millert 147: (void)fprintf(stderr, "Usage: %s [-x] [-md4|-md5|-sha1] [-n count] [-p password] <sequence#>[/] key\n", s);
1.1 deraadt 148: exit(1);
149: }