Annotation of src/usr.bin/skeyinit/skeyinit.c, Revision 1.58
1.58 ! deraadt 1: /* $OpenBSD: skeyinit.c,v 1.57 2015/04/18 18:28:38 deraadt Exp $ */
1.1 deraadt 2:
1.28 millert 3: /* OpenBSD S/Key (skeyinit.c)
1.1 deraadt 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>
1.20 millert 10: * Todd C. Miller <Todd.Miller@courtesan.com>
11: *
1.28 millert 12: * S/Key initialization and seed update
1.1 deraadt 13: */
14:
1.20 millert 15: #include <sys/file.h>
1.32 millert 16: #include <sys/resource.h>
17: #include <sys/stat.h>
1.1 deraadt 18: #include <sys/time.h>
19:
1.32 millert 20: #include <ctype.h>
1.19 millert 21: #include <err.h>
1.20 millert 22: #include <errno.h>
1.19 millert 23: #include <pwd.h>
1.28 millert 24: #include <readpassphrase.h>
1.1 deraadt 25: #include <stdio.h>
26: #include <stdlib.h>
27: #include <string.h>
1.19 millert 28: #include <syslog.h>
29: #include <time.h>
1.1 deraadt 30: #include <unistd.h>
1.56 deraadt 31: #include <limits.h>
1.6 millert 32: #include <utmp.h>
1.19 millert 33:
1.4 millert 34: #include <skey.h>
1.32 millert 35: #include <bsd_auth.h>
1.1 deraadt 36:
1.4 millert 37: #ifndef SKEY_NAMELEN
1.17 millert 38: #define SKEY_NAMELEN 4
1.4 millert 39: #endif
1.1 deraadt 40:
1.36 millert 41: void usage(void);
1.44 deraadt 42: void secure_mode(int *, char *, char *, size_t, char *, size_t);
1.38 millert 43: void normal_mode(char *, int, char *, char *);
1.32 millert 44: void convert_db(void);
45: void enable_db(int);
1.8 millert 46:
1.1 deraadt 47: int
1.36 millert 48: main(int argc, char **argv)
1.1 deraadt 49: {
1.35 millert 50: int rval, i, l, n, defaultsetup, rmkey, hexmode, enable, convert;
1.56 deraadt 51: char hostname[HOST_NAME_MAX+1];
1.38 millert 52: char seed[SKEY_MAX_SEED_LEN + 1];
1.32 millert 53: char buf[256], key[SKEY_BINKEY_SIZE], filename[PATH_MAX], *ht;
54: char lastc, me[UT_NAMESIZE + 1], *p, *auth_type;
1.57 deraadt 55: const char *errstr;
1.39 millert 56: u_int32_t noise;
1.1 deraadt 57: struct skey skey;
58: struct passwd *pp;
59:
1.35 millert 60: n = rmkey = hexmode = enable = convert = 0;
1.32 millert 61: defaultsetup = 1;
62: ht = auth_type = NULL;
1.4 millert 63:
1.39 millert 64: /* Build up a default seed based on the hostname and some noise */
1.1 deraadt 65: if (gethostname(hostname, sizeof(hostname)) < 0)
66: err(1, "gethostname");
1.38 millert 67: for (i = 0, p = seed; hostname[i] && i < SKEY_NAMELEN; i++) {
1.52 deraadt 68: if (isalpha((unsigned char)hostname[i])) {
69: if (isupper((unsigned char)hostname[i]))
70: hostname[i] = tolower((unsigned char)hostname[i]);
1.26 millert 71: *p++ = hostname[i];
1.52 deraadt 72: } else if (isdigit((unsigned char)hostname[i]))
1.25 millert 73: *p++ = hostname[i];
1.39 millert 74: }
75: noise = arc4random();
76: for (i = 0; i < 5; i++) {
77: *p++ = (noise % 10) + '0';
78: noise /= 10;
1.25 millert 79: }
80: *p = '\0';
1.1 deraadt 81:
82: if ((pp = getpwuid(getuid())) == NULL)
1.40 deraadt 83: err(1, "no user with uid %u", getuid());
1.42 deraadt 84: (void)strlcpy(me, pp->pw_name, sizeof me);
1.1 deraadt 85:
86: if ((pp = getpwnam(me)) == NULL)
87: err(1, "Who are you?");
88:
1.8 millert 89: for (i = 1; i < argc && argv[i][0] == '-' && strcmp(argv[i], "--");) {
90: if (argv[i][2] == '\0') {
91: /* Single character switch */
92: switch (argv[i][1]) {
1.32 millert 93: case 'a':
94: if (argv[++i] == NULL || argv[i][0] == '\0')
1.36 millert 95: usage();
1.48 otto 96: auth_type = argv[i];
1.32 millert 97: break;
1.4 millert 98: case 's':
99: defaultsetup = 0;
1.48 otto 100: if (auth_type == NULL)
101: auth_type = "skey";
1.4 millert 102: break;
103: case 'x':
104: hexmode = 1;
105: break;
1.35 millert 106: case 'r':
107: rmkey = 1;
1.4 millert 108: break;
1.17 millert 109: case 'n':
1.23 deraadt 110: if (argv[++i] == NULL || argv[i][0] == '\0')
1.36 millert 111: usage();
1.57 deraadt 112: n = strtonum(argv[i], 1, SKEY_MAX_SEQ - 1, &errstr);
113: if (errstr)
1.17 millert 114: errx(1, "count must be > 0 and < %d",
115: SKEY_MAX_SEQ);
116: break;
1.32 millert 117: case 'C':
118: convert = 1;
119: break;
120: case 'D':
121: enable = -1;
122: break;
123: case 'E':
124: enable = 1;
125: break;
1.8 millert 126: default:
1.36 millert 127: usage();
1.8 millert 128: }
129: } else {
130: /* Multi character switches are hash types */
131: if ((ht = skey_set_algorithm(&argv[i][1])) == NULL) {
132: warnx("Unknown hash algorithm %s", &argv[i][1]);
1.36 millert 133: usage();
1.8 millert 134: }
1.7 millert 135: }
1.8 millert 136: i++;
1.7 millert 137: }
1.32 millert 138: argv += i;
139: argc -= i;
1.7 millert 140:
1.32 millert 141: if (argc > 1 || (enable && convert) || (enable && argc) ||
142: (convert && argc))
1.36 millert 143: usage();
1.32 millert 144:
145: /* Handle -C, -D, and -E */
1.34 millert 146: if (convert || enable) {
147: if (convert)
148: convert_db();
149: else
150: enable_db(enable);
151: exit(0);
152: }
1.32 millert 153:
154: /* Check for optional user string. */
155: if (argc == 1) {
1.36 millert 156: if ((pp = getpwnam(argv[0])) == NULL) {
1.16 millert 157: if (getuid() == 0) {
158: static struct passwd _pp;
159:
1.36 millert 160: _pp.pw_name = argv[0];
1.16 millert 161: pp = &_pp;
1.36 millert 162: warnx("Warning, user unknown: %s", argv[0]);
1.16 millert 163: } else {
1.36 millert 164: errx(1, "User unknown: %s", argv[0]);
1.16 millert 165: }
1.32 millert 166: } else if (strcmp(pp->pw_name, me) != 0 && getuid() != 0) {
167: /* Only root can change other's S/Keys. */
168: errx(1, "Permission denied.");
1.1 deraadt 169: }
170: }
171:
1.41 millert 172: switch (skey_haskey(pp->pw_name)) {
173: case -1:
174: if (errno == ENOENT || errno == EPERM)
175: errx(1, "S/Key disabled");
176: else
177: err(1, "cannot open database");
178: break;
179: case 0:
180: /* existing user */
181: break;
182: case 1:
1.48 otto 183: if (!defaultsetup && strcmp(auth_type, "skey") == 0) {
1.41 millert 184: fprintf(stderr,
1.45 espie 185: "You must authenticate yourself before using S/Key for the first time. In\n"
186: "secure mode this is normally done via an existing S/Key key. However, since\n"
187: "you do not have an entry in the S/Key database you will have to specify an\n"
188: "alternate authentication type via the `-a' flag, e.g.\n"
1.54 ajacouto 189: " \"skeyinit -s -a passwd\"\n\n"
1.45 espie 190: "Note that entering a plaintext password over a non-secure link defeats the\n"
191: "purpose of using S/Key in the fist place.\n");
1.41 millert 192: exit(1);
193: }
194: break;
195: }
196:
1.28 millert 197: if (defaultsetup)
1.32 millert 198: fputs("Reminder - Only use this method if you are directly "
199: "connected\n or have an encrypted channel. If "
200: "you are using telnet,\n hit return now and use "
201: "skeyinit -s.\n", stderr);
1.28 millert 202:
1.1 deraadt 203: if (getuid() != 0) {
1.32 millert 204: if ((pp = pw_dup(pp)) == NULL)
205: err(1, NULL);
206: if (!auth_userokay(pp->pw_name, auth_type, NULL, NULL))
207: errx(1, "Password incorrect");
1.10 millert 208: }
1.1 deraadt 209:
1.28 millert 210: /*
211: * Lookup and lock the record we are about to modify.
212: * If this is a new entry this will prevent other users
213: * from appending new entries (and clobbering ours).
214: */
1.1 deraadt 215: rval = skeylookup(&skey, pp->pw_name);
216: switch (rval) {
1.4 millert 217: case -1:
1.41 millert 218: err(1, "cannot open database");
1.21 millert 219: break;
1.4 millert 220: case 0:
1.35 millert 221: /* remove user if asked to do so */
222: if (rmkey) {
223: if (snprintf(filename, sizeof(filename),
224: "%s/%s", _PATH_SKEYDIR, pp->pw_name)
1.55 guenther 225: >= sizeof(filename))
226: errc(1, ENAMETOOLONG,
227: "Cannot remove S/Key entry");
1.35 millert 228: if (unlink(filename) != 0)
229: err(1, "Cannot remove S/Key entry");
230: printf("S/Key entry for %s removed.\n",
231: pp->pw_name);
232: exit(0);
233: }
1.4 millert 234:
1.28 millert 235: (void)printf("[Updating %s with %s]\n", pp->pw_name,
236: ht ? ht : skey_get_algorithm());
237: (void)printf("Old seed: [%s] %s\n",
238: skey_get_algorithm(), skey.seed);
1.4 millert 239:
240: /*
1.25 millert 241: * Sanity check old seed.
242: */
243: l = strlen(skey.seed);
244: for (p = skey.seed; *p; p++) {
1.52 deraadt 245: if (isalpha((unsigned char)*p)) {
246: if (isupper((unsigned char)*p))
247: *p = tolower((unsigned char)*p);
248: } else if (!isdigit((unsigned char)*p)) {
1.25 millert 249: memmove(p, p + 1, l - (p - skey.seed));
250: l--;
251: }
252: }
253:
1.28 millert 254: /* If the seed ends in 0-8 just add one. */
1.4 millert 255: if (l > 0) {
256: lastc = skey.seed[l - 1];
1.52 deraadt 257: if (isdigit((unsigned char)lastc) &&
258: lastc != '9') {
1.43 deraadt 259: (void)strlcpy(seed, skey.seed,
260: sizeof seed);
1.38 millert 261: seed[l - 1] = lastc + 1;
1.4 millert 262: }
1.52 deraadt 263: if (isdigit((unsigned char)lastc) &&
264: lastc == '9' && l < 16) {
1.43 deraadt 265: (void)strlcpy(seed, skey.seed,
266: sizeof seed);
1.38 millert 267: seed[l - 1] = '0';
268: seed[l] = '0';
269: seed[l + 1] = '\0';
1.4 millert 270: }
1.1 deraadt 271: }
1.4 millert 272: break;
273: case 1:
1.35 millert 274: if (rmkey)
275: errx(1, "You have no entry to remove.");
1.28 millert 276: (void)printf("[Adding %s with %s]\n", pp->pw_name,
277: ht ? ht : skey_get_algorithm());
1.32 millert 278: if (snprintf(filename, sizeof(filename), "%s/%s",
1.55 guenther 279: _PATH_SKEYDIR, pp->pw_name) >= sizeof(filename))
280: errc(1, ENAMETOOLONG,
281: "Cannot create S/Key entry");
1.36 millert 282: if ((l = open(filename,
283: O_RDWR | O_NONBLOCK | O_CREAT | O_TRUNC |O_NOFOLLOW,
1.32 millert 284: S_IRUSR | S_IWUSR)) == -1 ||
285: flock(l, LOCK_EX) != 0 ||
286: (skey.keyfile = fdopen(l, "r+")) == NULL)
287: err(1, "Cannot create S/Key entry");
1.4 millert 288: break;
1.1 deraadt 289: }
1.32 millert 290: if (fchown(fileno(skey.keyfile), pp->pw_uid, -1) != 0 ||
291: fchmod(fileno(skey.keyfile), S_IRUSR | S_IWUSR) != 0)
292: err(1, "can't set owner/mode for %s", pp->pw_name);
1.17 millert 293: if (n == 0)
1.47 otto 294: n = 100;
1.1 deraadt 295:
1.8 millert 296: /* Set hash type if asked to */
1.28 millert 297: if (ht && strcmp(ht, skey_get_algorithm()) != 0)
298: skey_set_algorithm(ht);
299:
300: alarm(180);
301: if (!defaultsetup)
1.44 deraadt 302: secure_mode(&n, key, seed, sizeof seed, buf, sizeof(buf));
1.28 millert 303: else
1.38 millert 304: normal_mode(pp->pw_name, n, key, seed);
1.28 millert 305: alarm(0);
1.4 millert 306:
1.32 millert 307: /* XXX - why use malloc here? */
1.58 ! deraadt 308: if ((skey.val = malloc(16 + 1)) == NULL)
1.28 millert 309: err(1, "Can't allocate memory");
310: btoa8(skey.val, key);
1.1 deraadt 311:
1.32 millert 312: (void)fseek(skey.keyfile, 0L, SEEK_SET);
313: (void)fprintf(skey.keyfile, "%s\n%s\n%04d\n%s\n%s\n",
314: pp->pw_name, skey_get_algorithm(), n, seed, skey.val);
1.28 millert 315: (void)fclose(skey.keyfile);
1.4 millert 316:
1.28 millert 317: (void)printf("\nID %s skey is otp-%s %d %s\n", pp->pw_name,
1.38 millert 318: skey_get_algorithm(), n, seed);
1.28 millert 319: (void)printf("Next login password: %s\n\n",
320: hexmode ? put8(buf, key) : btoe(buf, key));
321: exit(0);
322: }
1.1 deraadt 323:
1.28 millert 324: void
1.44 deraadt 325: secure_mode(int *count, char *key, char *seed, size_t seedlen,
326: char *buf, size_t bufsiz)
1.28 millert 327: {
1.38 millert 328: char *p, newseed[SKEY_MAX_SEED_LEN + 2];
1.57 deraadt 329: const char *errstr;
1.28 millert 330: int i, n;
1.4 millert 331:
1.28 millert 332: (void)puts("You need the 6 words generated from the \"skey\" command.");
333: for (i = 0; ; i++) {
334: if (i >= 2)
335: exit(1);
336:
337: (void)printf("Enter sequence count from 1 to %d: ",
338: SKEY_MAX_SEQ);
339: (void)fgets(buf, bufsiz, stdin);
340: clearerr(stdin);
1.57 deraadt 341: n = strtonum(buf, 1, SKEY_MAX_SEQ-1, &errstr);
342: if (!errstr)
1.28 millert 343: break; /* Valid range */
1.57 deraadt 344: fprintf(stderr, "ERROR: Count must be between 1 and %d\n",
345: SKEY_MAX_SEQ - 1);
1.28 millert 346: }
1.1 deraadt 347:
1.28 millert 348: for (i = 0; ; i++) {
349: if (i >= 2)
350: exit(1);
351:
1.38 millert 352: (void)printf("Enter new seed [default %s]: ", seed);
353: (void)fgets(newseed, sizeof(newseed), stdin); /* XXX */
1.28 millert 354: clearerr(stdin);
1.38 millert 355: rip(newseed);
356: if (strlen(newseed) > SKEY_MAX_SEED_LEN) {
1.28 millert 357: (void)fprintf(stderr, "ERROR: Seed must be between 1 "
358: "and %d characters in length\n", SKEY_MAX_SEED_LEN);
359: continue;
360: }
1.38 millert 361: for (p = newseed; *p; p++) {
1.52 deraadt 362: if (isspace((unsigned char)*p)) {
1.28 millert 363: (void)fputs("ERROR: Seed must not contain "
364: "any spaces\n", stderr);
1.1 deraadt 365: break;
1.52 deraadt 366: } else if (isalpha((unsigned char)*p)) {
367: if (isupper((unsigned char)*p))
368: *p = tolower((unsigned char)*p);
369: } else if (!isdigit((unsigned char)*p)) {
1.28 millert 370: (void)fputs("ERROR: Seed must be purely "
371: "alphanumeric\n", stderr);
372: break;
373: }
1.1 deraadt 374: }
1.28 millert 375: if (*p == '\0')
376: break; /* Valid seed */
377: }
1.38 millert 378: if (newseed[0] != '\0')
1.44 deraadt 379: (void)strlcpy(seed, newseed, seedlen);
1.1 deraadt 380:
1.28 millert 381: for (i = 0; ; i++) {
382: if (i >= 2)
383: exit(1);
384:
385: (void)printf("otp-%s %d %s\nS/Key access password: ",
386: skey_get_algorithm(), n, seed);
387: (void)fgets(buf, bufsiz, stdin);
388: clearerr(stdin);
389: rip(buf);
390: backspace(buf);
391:
392: if (buf[0] == '?') {
393: (void)puts("Enter 6 words from secure S/Key calculation.");
394: continue;
395: } else if (buf[0] == '\0')
396: exit(1);
397:
398: if (etob(key, buf) == 1 || atob8(key, buf) == 0)
399: break; /* Valid format */
400: (void)fputs("ERROR: Invalid format - try again with the 6 words.\n",
401: stderr);
1.1 deraadt 402: }
1.28 millert 403: *count= n;
404: }
1.1 deraadt 405:
1.28 millert 406: void
1.38 millert 407: normal_mode(char *username, int n, char *key, char *seed)
1.28 millert 408: {
409: int i, nn;
1.38 millert 410: char passwd[SKEY_MAX_PW_LEN+2], key2[SKEY_BINKEY_SIZE];
1.1 deraadt 411:
1.28 millert 412: /* Get user's secret passphrase */
413: for (i = 0; ; i++) {
414: if (i > 2)
1.38 millert 415: errx(1, "S/Key entry not updated");
1.28 millert 416:
1.46 otto 417: if (readpassphrase("Enter new secret passphrase: ", passwd,
1.28 millert 418: sizeof(passwd), 0) == NULL || passwd[0] == '\0')
419: exit(1);
420:
421: if (strlen(passwd) < SKEY_MIN_PW_LEN) {
422: (void)fprintf(stderr,
423: "ERROR: Your passphrase must be at least %d "
424: "characters long.\n", SKEY_MIN_PW_LEN);
425: continue;
426: } else if (strcmp(passwd, username) == 0) {
427: (void)fputs("ERROR: Your passphrase may not be the "
428: "same as your user name.\n", stderr);
429: continue;
1.50 deraadt 430: } else if (strspn(passwd, "abcdefghijklmnopqrstuvwxyz") ==
1.28 millert 431: strlen(passwd)) {
432: (void)fputs("ERROR: Your passphrase must contain more "
433: "than just lower case letters.\nWhitespace, "
1.37 aaron 434: "numbers, and punctuation are suggested.\n",
435: stderr);
1.28 millert 436: continue;
437: } else if (strlen(passwd) > 63) {
438: (void)fprintf(stderr, "WARNING: Your passphrase is "
439: "longer than the recommended maximum length of 63\n");
440: }
441: /* XXX - should check for passphrase that is really too long */
1.13 millert 442:
1.38 millert 443: /* Crunch seed and passphrase into starting key */
444: nn = keycrunch(key, seed, passwd);
445: memset(passwd, 0, sizeof(passwd));
446: if (nn != 0)
447: err(2, "key crunch failed");
448:
449: if (readpassphrase("Again secret passphrase: ", passwd,
450: sizeof(passwd), 0) == NULL || passwd[0] == '\0')
451: exit(1);
452:
453: /* Crunch seed and passphrase into starting key */
454: nn = keycrunch(key2, seed, passwd);
455: memset(passwd, 0, sizeof(passwd));
456: if (nn != 0)
457: err(2, "key crunch failed");
458:
459: if (memcmp(key, key2, sizeof(key2)) == 0)
1.28 millert 460: break;
1.1 deraadt 461:
1.28 millert 462: (void)fputs("Passphrases do not match.\n", stderr);
1.20 millert 463: }
1.28 millert 464:
465: nn = n;
466: while (nn-- != 0)
467: f(key);
468: }
469:
1.32 millert 470: void
1.36 millert 471: enable_db(int op)
1.32 millert 472: {
473: if (op == 1) {
474: /* enable */
475: if (mkdir(_PATH_SKEYDIR, 01730) != 0 && errno != EEXIST)
476: err(1, "can't mkdir %s", _PATH_SKEYDIR);
1.33 millert 477: if (chown(_PATH_SKEYDIR, geteuid(), getegid()) != 0)
478: err(1, "can't chown %s", _PATH_SKEYDIR);
1.32 millert 479: if (chmod(_PATH_SKEYDIR, 01730) != 0)
480: err(1, "can't chmod %s", _PATH_SKEYDIR);
481: } else {
482: /* disable */
483: if (chmod(_PATH_SKEYDIR, 0) != 0 && errno != ENOENT)
484: err(1, "can't chmod %s", _PATH_SKEYDIR);
485: }
486: }
487:
488: #define _PATH_SKEYKEYS "/etc/skeykeys"
489: void
490: convert_db(void)
491: {
492: struct passwd *pp;
493: uid_t uid;
494: FILE *keyfile;
495: FILE *newfile;
496: char buf[256], *logname, *hashtype, *seed, *val, *cp;
497: char filename[PATH_MAX];
1.57 deraadt 498: const char *errstr;
1.32 millert 499: int fd, n;
500:
501: if ((keyfile = fopen(_PATH_SKEYKEYS, "r")) == NULL)
502: err(1, "can't open %s", _PATH_SKEYKEYS);
503: if (flock(fileno(keyfile), LOCK_EX) != 0)
504: err(1, "can't lock %s", _PATH_SKEYKEYS);
1.34 millert 505: enable_db(1);
1.32 millert 506:
507: /*
508: * Loop over each entry in _PATH_SKEYKEYS, creating a file
509: * in _PATH_SKEYDIR for each one.
510: */
511: while (fgets(buf, sizeof(buf), keyfile) != NULL) {
512: if (buf[0] == '#')
513: continue;
514: if ((logname = strtok(buf, " \t")) == NULL)
515: continue;
516: if ((cp = strtok(NULL, " \t")) == NULL)
517: continue;
1.53 naddy 518: if (!isalpha((unsigned char)*cp))
519: continue;
520: hashtype = cp;
521: if ((cp = strtok(NULL, " \t")) == NULL)
522: continue;
1.57 deraadt 523: n = strtonum(cp, 0, SKEY_MAX_SEQ, &errstr);
524: if (errstr)
525: continue;
1.32 millert 526: if ((seed = strtok(NULL, " \t")) == NULL)
527: continue;
528: if ((val = strtok(NULL, " \t")) == NULL)
529: continue;
530:
531: if ((pp = getpwnam(logname)) != NULL)
532: uid = pp->pw_uid;
533: else
534: uid = 0;
535:
536: /* Now write the new-style record. */
537: if (snprintf(filename, sizeof(filename), "%s/%s", _PATH_SKEYDIR,
538: logname) >= sizeof(filename)) {
1.55 guenther 539: warnc(ENAMETOOLONG, "%s", logname);
1.32 millert 540: continue;
541: }
542: fd = open(filename, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
543: if (fd == -1 || flock(fd, LOCK_EX) != 0 ||
544: (newfile = fdopen(fd, "r+")) == NULL) {
545: warn("%s", logname);
546: continue;
547: }
548: (void)fprintf(newfile, "%s\n%s\n%04d\n%s\n%s\n", logname,
549: hashtype, n, seed, val);
550: (void)fchown(fileno(newfile), uid, -1);
551: (void)fclose(newfile);
552: }
553: printf("%s has been populated. NOTE: %s has *not* been removed.\n"
554: "It should be removed once you have verified that the new keys "
555: "work.\n", _PATH_SKEYDIR, _PATH_SKEYKEYS);
1.8 millert 556: }
557:
558: void
1.36 millert 559: usage(void)
1.8 millert 560: {
1.36 millert 561: extern char *__progname;
562:
1.51 jmc 563: (void)fprintf(stderr, "usage: %s [-CDErsx] [-a auth-type] [-n count]"
1.53 naddy 564: "\n\t[-md5 | -rmd160 | -sha1] [user]\n", __progname);
1.8 millert 565: exit(1);
1.1 deraadt 566: }
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