Annotation of src/usr.bin/skeyinit/skeyinit.c, Revision 1.47
1.47 ! otto 1: /* $OpenBSD: skeyinit.c,v 1.46 2004/06/04 18:18:20 otto 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:
15: #include <sys/param.h>
1.20 millert 16: #include <sys/file.h>
1.32 millert 17: #include <sys/resource.h>
18: #include <sys/stat.h>
1.1 deraadt 19: #include <sys/time.h>
20:
1.32 millert 21: #include <ctype.h>
1.19 millert 22: #include <err.h>
1.20 millert 23: #include <errno.h>
1.19 millert 24: #include <pwd.h>
1.28 millert 25: #include <readpassphrase.h>
1.1 deraadt 26: #include <stdio.h>
27: #include <stdlib.h>
28: #include <string.h>
1.19 millert 29: #include <syslog.h>
30: #include <time.h>
1.1 deraadt 31: #include <unistd.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 *);
1.31 millert 44: void timedout(int);
1.32 millert 45: void convert_db(void);
46: void enable_db(int);
1.8 millert 47:
1.1 deraadt 48: int
1.36 millert 49: main(int argc, char **argv)
1.1 deraadt 50: {
1.35 millert 51: int rval, i, l, n, defaultsetup, rmkey, hexmode, enable, convert;
1.1 deraadt 52: char hostname[MAXHOSTNAMELEN];
1.38 millert 53: char seed[SKEY_MAX_SEED_LEN + 1];
1.32 millert 54: char buf[256], key[SKEY_BINKEY_SIZE], filename[PATH_MAX], *ht;
55: char lastc, me[UT_NAMESIZE + 1], *p, *auth_type;
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++) {
1.25 millert 68: if (isalpha(hostname[i])) {
1.26 millert 69: if (isupper(hostname[i]))
70: hostname[i] = tolower(hostname[i]);
71: *p++ = hostname[i];
1.25 millert 72: } else if (isdigit(hostname[i]))
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();
1.41 millert 96: if (auth_type == NULL)
97: auth_type = argv[i];
1.32 millert 98: break;
1.4 millert 99: case 's':
100: defaultsetup = 0;
1.32 millert 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();
1.17 millert 112: if ((n = atoi(argv[i])) < 1 || n >= SKEY_MAX_SEQ)
113: errx(1, "count must be > 0 and < %d",
114: SKEY_MAX_SEQ);
115: break;
1.32 millert 116: case 'C':
117: convert = 1;
118: break;
119: case 'D':
120: enable = -1;
121: break;
122: case 'E':
123: enable = 1;
124: break;
1.8 millert 125: default:
1.36 millert 126: usage();
1.8 millert 127: }
128: } else {
129: /* Multi character switches are hash types */
130: if ((ht = skey_set_algorithm(&argv[i][1])) == NULL) {
131: warnx("Unknown hash algorithm %s", &argv[i][1]);
1.36 millert 132: usage();
1.8 millert 133: }
1.7 millert 134: }
1.8 millert 135: i++;
1.7 millert 136: }
1.32 millert 137: argv += i;
138: argc -= i;
1.7 millert 139:
1.32 millert 140: if (argc > 1 || (enable && convert) || (enable && argc) ||
141: (convert && argc))
1.36 millert 142: usage();
1.32 millert 143:
144: /* Handle -C, -D, and -E */
1.34 millert 145: if (convert || enable) {
146: if (convert)
147: convert_db();
148: else
149: enable_db(enable);
150: exit(0);
151: }
1.32 millert 152:
153: /* Check for optional user string. */
154: if (argc == 1) {
1.36 millert 155: if ((pp = getpwnam(argv[0])) == NULL) {
1.16 millert 156: if (getuid() == 0) {
157: static struct passwd _pp;
158:
1.36 millert 159: _pp.pw_name = argv[0];
1.16 millert 160: pp = &_pp;
1.36 millert 161: warnx("Warning, user unknown: %s", argv[0]);
1.16 millert 162: } else {
1.36 millert 163: errx(1, "User unknown: %s", argv[0]);
1.16 millert 164: }
1.32 millert 165: } else if (strcmp(pp->pw_name, me) != 0 && getuid() != 0) {
166: /* Only root can change other's S/Keys. */
167: errx(1, "Permission denied.");
1.1 deraadt 168: }
169: }
170:
1.41 millert 171: switch (skey_haskey(pp->pw_name)) {
172: case -1:
173: if (errno == ENOENT || errno == EPERM)
174: errx(1, "S/Key disabled");
175: else
176: err(1, "cannot open database");
177: break;
178: case 0:
179: /* existing user */
180: break;
181: case 1:
182: if (!defaultsetup) {
183: fprintf(stderr,
1.45 espie 184: "You must authenticate yourself before using S/Key for the first time. In\n"
185: "secure mode this is normally done via an existing S/Key key. However, since\n"
186: "you do not have an entry in the S/Key database you will have to specify an\n"
187: "alternate authentication type via the `-a' flag, e.g.\n"
188: " \"skeyinit -s -a krb5\" or \"skeyinit -s -a passwd\"\n\n"
189: "Note that entering a plaintext password over a non-secure link defeats the\n"
190: "purpose of using S/Key in the fist place.\n");
1.41 millert 191: exit(1);
192: }
193: break;
194: }
195:
1.28 millert 196: if (defaultsetup)
1.32 millert 197: fputs("Reminder - Only use this method if you are directly "
198: "connected\n or have an encrypted channel. If "
199: "you are using telnet,\n hit return now and use "
200: "skeyinit -s.\n", stderr);
1.28 millert 201:
1.1 deraadt 202: if (getuid() != 0) {
1.32 millert 203: if ((pp = pw_dup(pp)) == NULL)
204: err(1, NULL);
205: if (!auth_userokay(pp->pw_name, auth_type, NULL, NULL))
206: errx(1, "Password incorrect");
1.10 millert 207: }
1.1 deraadt 208:
1.28 millert 209: /*
210: * Lookup and lock the record we are about to modify.
211: * If this is a new entry this will prevent other users
212: * from appending new entries (and clobbering ours).
213: */
1.1 deraadt 214: rval = skeylookup(&skey, pp->pw_name);
215: switch (rval) {
1.4 millert 216: case -1:
1.41 millert 217: err(1, "cannot open database");
1.21 millert 218: break;
1.4 millert 219: case 0:
1.35 millert 220: /* remove user if asked to do so */
221: if (rmkey) {
222: if (snprintf(filename, sizeof(filename),
223: "%s/%s", _PATH_SKEYDIR, pp->pw_name)
224: >= sizeof(filename)) {
225: errno = ENAMETOOLONG;
226: err(1, "Cannot remove S/Key entry");
227: }
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++) {
245: if (isalpha(*p)) {
246: if (isupper(*p))
247: *p = tolower(*p);
248: } else if (!isdigit(*p)) {
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];
257: if (isdigit(lastc) && lastc != '9') {
1.43 deraadt 258: (void)strlcpy(seed, skey.seed,
259: sizeof seed);
1.38 millert 260: seed[l - 1] = lastc + 1;
1.4 millert 261: }
262: if (isdigit(lastc) && lastc == '9' && l < 16) {
1.43 deraadt 263: (void)strlcpy(seed, skey.seed,
264: sizeof seed);
1.38 millert 265: seed[l - 1] = '0';
266: seed[l] = '0';
267: seed[l + 1] = '\0';
1.4 millert 268: }
1.1 deraadt 269: }
1.4 millert 270: break;
271: case 1:
1.35 millert 272: if (rmkey)
273: errx(1, "You have no entry to remove.");
1.28 millert 274: (void)printf("[Adding %s with %s]\n", pp->pw_name,
275: ht ? ht : skey_get_algorithm());
1.32 millert 276: if (snprintf(filename, sizeof(filename), "%s/%s",
277: _PATH_SKEYDIR, pp->pw_name) >= sizeof(filename)) {
278: errno = ENAMETOOLONG;
279: err(1, "Cannot create S/Key entry");
280: }
1.36 millert 281: if ((l = open(filename,
282: O_RDWR | O_NONBLOCK | O_CREAT | O_TRUNC |O_NOFOLLOW,
1.32 millert 283: S_IRUSR | S_IWUSR)) == -1 ||
284: flock(l, LOCK_EX) != 0 ||
285: (skey.keyfile = fdopen(l, "r+")) == NULL)
286: err(1, "Cannot create S/Key entry");
1.4 millert 287: break;
1.1 deraadt 288: }
1.32 millert 289: if (fchown(fileno(skey.keyfile), pp->pw_uid, -1) != 0 ||
290: fchmod(fileno(skey.keyfile), S_IRUSR | S_IWUSR) != 0)
291: err(1, "can't set owner/mode for %s", pp->pw_name);
1.17 millert 292: if (n == 0)
1.47 ! otto 293: n = 100;
1.1 deraadt 294:
1.8 millert 295: /* Set hash type if asked to */
1.28 millert 296: if (ht && strcmp(ht, skey_get_algorithm()) != 0)
297: skey_set_algorithm(ht);
298:
299: alarm(180);
300: if (!defaultsetup)
1.44 deraadt 301: secure_mode(&n, key, seed, sizeof seed, buf, sizeof(buf));
1.28 millert 302: else
1.38 millert 303: normal_mode(pp->pw_name, n, key, seed);
1.28 millert 304: alarm(0);
1.4 millert 305:
1.32 millert 306: /* XXX - why use malloc here? */
1.28 millert 307: if ((skey.val = (char *)malloc(16 + 1)) == NULL)
308: err(1, "Can't allocate memory");
309: btoa8(skey.val, key);
1.1 deraadt 310:
1.32 millert 311: (void)fseek(skey.keyfile, 0L, SEEK_SET);
312: (void)fprintf(skey.keyfile, "%s\n%s\n%04d\n%s\n%s\n",
313: pp->pw_name, skey_get_algorithm(), n, seed, skey.val);
1.28 millert 314: (void)fclose(skey.keyfile);
1.4 millert 315:
1.28 millert 316: (void)printf("\nID %s skey is otp-%s %d %s\n", pp->pw_name,
1.38 millert 317: skey_get_algorithm(), n, seed);
1.28 millert 318: (void)printf("Next login password: %s\n\n",
319: hexmode ? put8(buf, key) : btoe(buf, key));
320: exit(0);
321: }
1.1 deraadt 322:
1.28 millert 323: void
1.44 deraadt 324: secure_mode(int *count, char *key, char *seed, size_t seedlen,
325: char *buf, size_t bufsiz)
1.28 millert 326: {
1.38 millert 327: char *p, newseed[SKEY_MAX_SEED_LEN + 2];
1.28 millert 328: int i, n;
1.4 millert 329:
1.28 millert 330: (void)puts("You need the 6 words generated from the \"skey\" command.");
331: for (i = 0; ; i++) {
332: if (i >= 2)
333: exit(1);
334:
335: (void)printf("Enter sequence count from 1 to %d: ",
336: SKEY_MAX_SEQ);
337: (void)fgets(buf, bufsiz, stdin);
338: clearerr(stdin);
339: n = atoi(buf);
340: if (n > 0 && n < SKEY_MAX_SEQ)
341: break; /* Valid range */
342: (void)fprintf(stderr, "ERROR: Count must be between 1 and %d\n",
343: SKEY_MAX_SEQ);
344: }
1.1 deraadt 345:
1.28 millert 346: for (i = 0; ; i++) {
347: if (i >= 2)
348: exit(1);
349:
1.38 millert 350: (void)printf("Enter new seed [default %s]: ", seed);
351: (void)fgets(newseed, sizeof(newseed), stdin); /* XXX */
1.28 millert 352: clearerr(stdin);
1.38 millert 353: rip(newseed);
354: if (strlen(newseed) > SKEY_MAX_SEED_LEN) {
1.28 millert 355: (void)fprintf(stderr, "ERROR: Seed must be between 1 "
356: "and %d characters in length\n", SKEY_MAX_SEED_LEN);
357: continue;
358: }
1.38 millert 359: for (p = newseed; *p; p++) {
1.28 millert 360: if (isspace(*p)) {
361: (void)fputs("ERROR: Seed must not contain "
362: "any spaces\n", stderr);
1.1 deraadt 363: break;
1.28 millert 364: } else if (isalpha(*p)) {
365: if (isupper(*p))
366: *p = tolower(*p);
367: } else if (!isdigit(*p)) {
368: (void)fputs("ERROR: Seed must be purely "
369: "alphanumeric\n", stderr);
370: break;
371: }
1.1 deraadt 372: }
1.28 millert 373: if (*p == '\0')
374: break; /* Valid seed */
375: }
1.38 millert 376: if (newseed[0] != '\0')
1.44 deraadt 377: (void)strlcpy(seed, newseed, seedlen);
1.1 deraadt 378:
1.28 millert 379: for (i = 0; ; i++) {
380: if (i >= 2)
381: exit(1);
382:
383: (void)printf("otp-%s %d %s\nS/Key access password: ",
384: skey_get_algorithm(), n, seed);
385: (void)fgets(buf, bufsiz, stdin);
386: clearerr(stdin);
387: rip(buf);
388: backspace(buf);
389:
390: if (buf[0] == '?') {
391: (void)puts("Enter 6 words from secure S/Key calculation.");
392: continue;
393: } else if (buf[0] == '\0')
394: exit(1);
395:
396: if (etob(key, buf) == 1 || atob8(key, buf) == 0)
397: break; /* Valid format */
398: (void)fputs("ERROR: Invalid format - try again with the 6 words.\n",
399: stderr);
1.1 deraadt 400: }
1.28 millert 401: *count= n;
402: }
1.1 deraadt 403:
1.28 millert 404: void
1.38 millert 405: normal_mode(char *username, int n, char *key, char *seed)
1.28 millert 406: {
407: int i, nn;
1.38 millert 408: char passwd[SKEY_MAX_PW_LEN+2], key2[SKEY_BINKEY_SIZE];
1.1 deraadt 409:
1.28 millert 410: /* Get user's secret passphrase */
411: for (i = 0; ; i++) {
412: if (i > 2)
1.38 millert 413: errx(1, "S/Key entry not updated");
1.28 millert 414:
1.46 otto 415: if (readpassphrase("Enter new secret passphrase: ", passwd,
1.28 millert 416: sizeof(passwd), 0) == NULL || passwd[0] == '\0')
417: exit(1);
418:
419: if (strlen(passwd) < SKEY_MIN_PW_LEN) {
420: (void)fprintf(stderr,
421: "ERROR: Your passphrase must be at least %d "
422: "characters long.\n", SKEY_MIN_PW_LEN);
423: continue;
424: } else if (strcmp(passwd, username) == 0) {
425: (void)fputs("ERROR: Your passphrase may not be the "
426: "same as your user name.\n", stderr);
427: continue;
428: } else if (strspn(passwd, "abcdefghijklmnopqrstuvwxyz") ==
429: strlen(passwd)) {
430: (void)fputs("ERROR: Your passphrase must contain more "
431: "than just lower case letters.\nWhitespace, "
1.37 aaron 432: "numbers, and punctuation are suggested.\n",
433: stderr);
1.28 millert 434: continue;
435: } else if (strlen(passwd) > 63) {
436: (void)fprintf(stderr, "WARNING: Your passphrase is "
437: "longer than the recommended maximum length of 63\n");
438: }
439: /* XXX - should check for passphrase that is really too long */
1.13 millert 440:
1.38 millert 441: /* Crunch seed and passphrase into starting key */
442: nn = keycrunch(key, seed, passwd);
443: memset(passwd, 0, sizeof(passwd));
444: if (nn != 0)
445: err(2, "key crunch failed");
446:
447: if (readpassphrase("Again secret passphrase: ", passwd,
448: sizeof(passwd), 0) == NULL || passwd[0] == '\0')
449: exit(1);
450:
451: /* Crunch seed and passphrase into starting key */
452: nn = keycrunch(key2, seed, passwd);
453: memset(passwd, 0, sizeof(passwd));
454: if (nn != 0)
455: err(2, "key crunch failed");
456:
457: if (memcmp(key, key2, sizeof(key2)) == 0)
1.28 millert 458: break;
1.1 deraadt 459:
1.28 millert 460: (void)fputs("Passphrases do not match.\n", stderr);
1.20 millert 461: }
1.28 millert 462:
463: nn = n;
464: while (nn-- != 0)
465: f(key);
466: }
467:
1.32 millert 468: void
1.36 millert 469: enable_db(int op)
1.32 millert 470: {
471: if (op == 1) {
472: /* enable */
473: if (mkdir(_PATH_SKEYDIR, 01730) != 0 && errno != EEXIST)
474: err(1, "can't mkdir %s", _PATH_SKEYDIR);
1.33 millert 475: if (chown(_PATH_SKEYDIR, geteuid(), getegid()) != 0)
476: err(1, "can't chown %s", _PATH_SKEYDIR);
1.32 millert 477: if (chmod(_PATH_SKEYDIR, 01730) != 0)
478: err(1, "can't chmod %s", _PATH_SKEYDIR);
479: } else {
480: /* disable */
481: if (chmod(_PATH_SKEYDIR, 0) != 0 && errno != ENOENT)
482: err(1, "can't chmod %s", _PATH_SKEYDIR);
483: }
484: }
485:
486: #define _PATH_SKEYKEYS "/etc/skeykeys"
487: void
488: convert_db(void)
489: {
490: struct passwd *pp;
491: uid_t uid;
492: FILE *keyfile;
493: FILE *newfile;
494: char buf[256], *logname, *hashtype, *seed, *val, *cp;
495: char filename[PATH_MAX];
496: int fd, n;
497:
498: if ((keyfile = fopen(_PATH_SKEYKEYS, "r")) == NULL)
499: err(1, "can't open %s", _PATH_SKEYKEYS);
500: if (flock(fileno(keyfile), LOCK_EX) != 0)
501: err(1, "can't lock %s", _PATH_SKEYKEYS);
1.34 millert 502: enable_db(1);
1.32 millert 503:
504: /*
505: * Loop over each entry in _PATH_SKEYKEYS, creating a file
506: * in _PATH_SKEYDIR for each one.
507: */
508: while (fgets(buf, sizeof(buf), keyfile) != NULL) {
509: if (buf[0] == '#')
510: continue;
511: if ((logname = strtok(buf, " \t")) == NULL)
512: continue;
513: if ((cp = strtok(NULL, " \t")) == NULL)
514: continue;
515: if (isalpha(*cp)) {
516: hashtype = cp;
517: if ((cp = strtok(NULL, " \t")) == NULL)
518: continue;
519: } else
520: hashtype = "md4";
521: n = atoi(cp);
522: if ((seed = strtok(NULL, " \t")) == NULL)
523: continue;
524: if ((val = strtok(NULL, " \t")) == NULL)
525: continue;
526:
527: if ((pp = getpwnam(logname)) != NULL)
528: uid = pp->pw_uid;
529: else
530: uid = 0;
531:
532: /* Now write the new-style record. */
533: if (snprintf(filename, sizeof(filename), "%s/%s", _PATH_SKEYDIR,
534: logname) >= sizeof(filename)) {
535: errno = ENAMETOOLONG;
536: warn("%s", logname);
537: continue;
538: }
539: fd = open(filename, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
540: if (fd == -1 || flock(fd, LOCK_EX) != 0 ||
541: (newfile = fdopen(fd, "r+")) == NULL) {
542: warn("%s", logname);
543: continue;
544: }
545: (void)fprintf(newfile, "%s\n%s\n%04d\n%s\n%s\n", logname,
546: hashtype, n, seed, val);
547: (void)fchown(fileno(newfile), uid, -1);
548: (void)fclose(newfile);
549: }
550: printf("%s has been populated. NOTE: %s has *not* been removed.\n"
551: "It should be removed once you have verified that the new keys "
552: "work.\n", _PATH_SKEYDIR, _PATH_SKEYKEYS);
553: }
554:
1.28 millert 555: #define TIMEOUT_MSG "Timed out waiting for input.\n"
556: void
1.36 millert 557: timedout(int signo)
1.28 millert 558: {
1.10 millert 559:
1.28 millert 560: write(STDERR_FILENO, TIMEOUT_MSG, sizeof(TIMEOUT_MSG) - 1);
561: _exit(1);
1.8 millert 562: }
563:
564: void
1.36 millert 565: usage(void)
1.8 millert 566: {
1.36 millert 567: extern char *__progname;
568:
569: (void)fprintf(stderr, "usage: %s [-r] [-s] [-x] [-C] [-D] [-E] "
1.32 millert 570: "[-a auth_type] [-n count]\n "
1.36 millert 571: "[-md4|-md5|-sha1|-rmd160] [user]\n", __progname);
1.8 millert 572: exit(1);
1.1 deraadt 573: }
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