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1.13 ! deraadt 1: /* * $OpenBSD: skey.c,v 1.12 1999/03/06 20:27:41 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];
1.12 millert 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 */
1.9 millert 43: if ((slash = strrchr(argv[0], '/')))
44: slash++;
45: else
46: slash = argv[0];
47: if (strncmp(slash, "otp-", 4) == 0) {
48: slash += 4;
49: if (skey_set_algorithm(slash) == NULL)
50: errx(1, "Unknown hash algorithm %s", slash);
1.1 deraadt 51: }
52:
1.5 millert 53: for (i = 1; i < argc && argv[i][0] == '-' && strcmp(argv[i], "--");) {
54: if (argv[i][2] == '\0') {
55: /* Single character switch */
56: switch (argv[i][1]) {
57: case 'n':
58: if (i + 1 == argc)
59: usage(argv[0]);
60: cnt = atoi(argv[++i]);
61: break;
62: case 'p':
63: if (i + 1 == argc)
64: usage(argv[0]);
1.13 ! deraadt 65: if (strlcpy(passwd, argv[++i], sizeof(passwd)) >
! 66: sizeof(passwd))
! 67: errx(1, "Password too long");
1.5 millert 68: pass = 1;
69: break;
70: case 'x':
71: hexmode = 1;
72: break;
73: default:
74: usage(argv[0]);
75: }
76: } else {
77: /* Multi character switches are hash types */
78: if (skey_set_algorithm(&argv[i][1]) == NULL) {
79: warnx("Unknown hash algorithm %s", &argv[i][1]);
80: usage(argv[0]);
81: }
1.4 millert 82: }
1.5 millert 83: i++;
1.4 millert 84: }
1.7 millert 85:
86: if (argc > i + 2)
87: usage(argv[0]);
1.4 millert 88:
1.5 millert 89: /* Could be in the form <number>/<seed> */
90: if (argc <= i + 1) {
1.1 deraadt 91: /* look for / in it */
1.5 millert 92: if (argc <= i)
1.1 deraadt 93: usage(argv[0]);
1.5 millert 94: slash = strchr(argv[i], '/');
1.1 deraadt 95: if (slash == NULL)
96: usage(argv[0]);
97: *slash++ = '\0';
98: seed = slash;
99:
1.5 millert 100: if ((n = atoi(argv[i])) < 0) {
1.8 millert 101: warnx("%d not positive", n);
102: usage(argv[0]);
103: } else if (n > SKEY_MAX_SEQ) {
104: warnx("%d is larger than max (%d)", n, SKEY_MAX_SEQ);
1.1 deraadt 105: usage(argv[0]);
106: }
107: } else {
1.5 millert 108: if ((n = atoi(argv[i])) < 0) {
1.9 millert 109: warnx("%d not positive", n);
1.8 millert 110: usage(argv[0]);
111: } else if (n > SKEY_MAX_SEQ) {
112: warnx("%d is larger than max (%d)", n, SKEY_MAX_SEQ);
1.1 deraadt 113: usage(argv[0]);
114: }
1.5 millert 115: seed = argv[++i];
1.1 deraadt 116: }
117:
118: /* Get user's secret password */
119: if (!pass) {
1.3 millert 120: (void)fputs("Reminder - Do not use this program while logged in via telnet or rlogin.\n", stderr);
121: (void)fputs("Enter secret password: ", stderr);
1.1 deraadt 122: readpass(passwd, sizeof(passwd));
1.6 millert 123: if (passwd[0] == '\0')
124: exit(1);
1.1 deraadt 125: }
126:
127: /* Crunch seed and password into starting key */
1.3 millert 128: if (keycrunch(key, seed, passwd) != 0)
129: errx(1, "key crunch failed");
130:
1.1 deraadt 131: if (cnt == 1) {
132: while (n-- != 0)
133: f(key);
1.12 millert 134: (void)puts(hexmode ? put8(buf, key) : btoe(buf, key));
1.1 deraadt 135: } else {
136: for (i = 0; i <= n - cnt; i++)
137: f(key);
138: for (; i <= n; i++) {
1.3 millert 139: if (hexmode)
140: (void)printf("%d: %-29s %s\n", i,
1.12 millert 141: btoe(buf, key), put8(buf, key));
1.3 millert 142: else
1.12 millert 143: (void)printf("%d: %-29s\n", i, btoe(buf, key));
1.1 deraadt 144: f(key);
145: }
146: }
147: exit(0);
148: }
149:
150: void
151: usage(s)
152: char *s;
153: {
1.10 millert 154: (void)fprintf(stderr, "Usage: %s [-x] [-md4|-md5|-sha1|-rmd160] [-n count] [-p password] <sequence#>[/] key\n", s);
1.1 deraadt 155: exit(1);
156: }