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[netbsd-mini2440.git] / usr.bin / skeyinit / skeyinit.c
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1 /* $NetBSD: skeyinit.c,v 1.28 2008/04/05 04:02:06 lukem Exp $ */
2
3 /* S/KEY v1.1b (skeyinit.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 * Modifications:
12 * Todd C. Miller <Todd.Miller@courtesan.com>
13 *
14 * S/KEY initialization and seed update
15 */
16
17 #include <sys/cdefs.h>
18
19 #ifndef lint
20 __RCSID("$NetBSD: skeyinit.c,v 1.28 2008/04/05 04:02:06 lukem Exp $");
21 #endif
22
23 #include <sys/param.h>
24 #include <sys/time.h>
25 #include <sys/resource.h>
26
27 #include <ctype.h>
28 #include <err.h>
29 #include <errno.h>
30 #include <fcntl.h>
31 #include <paths.h>
32 #include <pwd.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <time.h>
37 #include <unistd.h>
38
39 #include <skey.h>
40
41 #ifndef SKEY_NAMELEN
42 #define SKEY_NAMELEN 4
43 #endif
44
45 int main(int argc, char **argv)
46 {
47 int rval, nn, i;
48 size_t l;
49 int n = 0, defaultsetup = 1, zerokey = 0, hexmode = 0;
50 int argpass = 0, argkey = 0;
51 time_t now;
52 char hostname[MAXHOSTNAMELEN + 1];
53 char seed[SKEY_MAX_PW_LEN+2], key[SKEY_BINKEY_SIZE], defaultseed[SKEY_MAX_SEED_LEN+1];
54 char passwd[SKEY_MAX_PW_LEN+2], passwd2[SKEY_MAX_PW_LEN+2], tbuf[27], buf[80];
55 char lastc, me[LOGIN_NAME_MAX+1], *p, *pw, *ht = NULL;
56 const char *salt;
57 struct skey skey;
58 struct passwd *pp;
59 struct tm *tm;
60 int c;
61
62 pw = NULL; /* XXX gcc -Wuninitialized [sh3] */
63
64 /*
65 * Make sure using stdin/stdout/stderr is safe
66 * after opening any file.
67 */
68 i = open(_PATH_DEVNULL, O_RDWR);
69 while (i >= 0 && i < 2)
70 i = dup(i);
71 if (i > 2)
72 close(i);
73
74 if (geteuid() != 0)
75 errx(1, "must be setuid root.");
76
77 if (gethostname(hostname, sizeof(hostname)) < 0)
78 err(1, "gethostname");
79
80 /*
81 * Copy the hostname into the default seed, eliminating any
82 * non alpha-numeric characters.
83 */
84 for (i = 0, l = 0; l < sizeof(defaultseed); i++) {
85 if (hostname[i] == '\0') {
86 defaultseed[l] = hostname[i];
87 break;
88 }
89 if (isalnum((unsigned char)hostname[i]))
90 defaultseed[l++] = hostname[i];
91 }
92
93 defaultseed[SKEY_NAMELEN] = '\0';
94 (void)time(&now);
95 (void)snprintf(tbuf, sizeof(tbuf), "%05ld", (long) (now % 100000));
96 (void)strlcat(defaultseed, tbuf, sizeof(defaultseed));
97
98 if ((pp = getpwuid(getuid())) == NULL)
99 err(1, "no user with uid %ld", (u_long)getuid());
100 (void)strlcpy(me, pp->pw_name, sizeof(me));
101
102 if ((pp = getpwnam(me)) == NULL)
103 err(1, "Who are you?");
104 salt = pp->pw_passwd;
105
106 while((c = getopt(argc, argv, "k:n:p:t:sxz")) != -1) {
107 switch(c) {
108 case 'k':
109 argkey = 1;
110 if (strlen(optarg) > SKEY_MAX_PW_LEN)
111 errx(1, "key too long");
112 strlcpy(passwd, optarg, sizeof(passwd));
113 strlcpy(passwd2, optarg, sizeof(passwd));
114 break;
115 case 'n':
116 n = atoi(optarg);
117 if(n < 1 || n > SKEY_MAX_SEQ)
118 errx(1, "count must be between 1 and %d", SKEY_MAX_SEQ);
119 break;
120 case 'p':
121 if (strlen(optarg) >= _PASSWORD_LEN)
122 errx(1, "password too long");
123 if ((pw = malloc(_PASSWORD_LEN + 1)) == NULL)
124 err(1, "no memory for password");
125 strlcpy(pw, optarg, _PASSWORD_LEN + 1);
126 break;
127 case 't':
128 if(skey_set_algorithm(optarg) == NULL)
129 errx(1, "Unknown hash algorithm %s", optarg);
130 ht = optarg;
131 break;
132 case 's':
133 defaultsetup = 0;
134 break;
135 case 'x':
136 hexmode = 1;
137 break;
138 case 'z':
139 zerokey = 1;
140 break;
141 default:
142 errx(1, "usage: %s skeyinit [-sxz] [-k passphrase] "
143 "[-n count] [-p password] [-t hash] [user]",
144 argv[0]);
145 }
146 }
147
148 if(argc > optind) {
149 pp = getpwnam(argv[optind]);
150 if (pp == NULL)
151 errx(1, "User %s unknown", argv[optind]);
152 }
153
154 if (strcmp(pp->pw_name, me) != 0) {
155 if (getuid() != 0) {
156 /* Only root can change other's passwds */
157 errx(1, "Permission denied.");
158 }
159 }
160
161 if (getuid() != 0) {
162 if (!argpass)
163 pw = getpass("Password:");
164 p = crypt(pw, salt);
165
166 if (strcmp(p, pp->pw_passwd)) {
167 errx(1, "Password incorrect.");
168 }
169 }
170
171 rval = skeylookup(&skey, pp->pw_name);
172 switch (rval) {
173 case -1:
174 err(1, "cannot open database");
175 case 0:
176 /* comment out user if asked to */
177 if (zerokey)
178 exit(skeyzero(&skey, pp->pw_name));
179
180 printf("[Updating %s]\n", pp->pw_name);
181 printf("Old key: [%s] %s\n", skey_get_algorithm(), skey.seed);
182
183 /*
184 * lets be nice if they have a skey.seed that
185 * ends in 0-8 just add one
186 */
187 l = strlen(skey.seed);
188 if (l > 0) {
189 lastc = skey.seed[l - 1];
190 if (isdigit((unsigned char)lastc) && lastc != '9') {
191 (void)strlcpy(defaultseed, skey.seed,
192 sizeof(defaultseed));
193 defaultseed[l - 1] = lastc + 1;
194 }
195 if (isdigit((unsigned char)lastc) && lastc == '9' &&
196 l < 16) {
197 (void)strlcpy(defaultseed, skey.seed,
198 sizeof(defaultseed));
199 defaultseed[l - 1] = '0';
200 defaultseed[l] = '0';
201 defaultseed[l + 1] = '\0';
202 }
203 }
204 break;
205 case 1:
206 if (zerokey)
207 errx(1, "You have no entry to zero.");
208 printf("[Adding %s]\n", pp->pw_name);
209 break;
210 }
211
212 if (n==0)
213 n = 100;
214
215 /* Set hash type if asked to */
216 if (ht) {
217 /* Need to zero out old key when changing algorithm */
218 if (strcmp(ht, skey_get_algorithm()) && skey_set_algorithm(ht))
219 zerokey = 1;
220 }
221
222 if (!defaultsetup) {
223 printf("You need the 6 english words generated from the \"skey\" command.\n");
224 for (i = 0;; i++) {
225 if (i >= 2)
226 exit(1);
227 printf("Enter sequence count from 1 to %d: ", SKEY_MAX_SEQ);
228 fgets(buf, sizeof(buf), stdin);
229 n = atoi(buf);
230 if (n > 0 && n < SKEY_MAX_SEQ)
231 break; /* Valid range */
232 printf("\nError: Count must be between 0 and %d\n", SKEY_MAX_SEQ);
233 }
234
235 for (i = 0;; i++) {
236 if (i >= 2)
237 exit(1);
238
239 printf("Enter new seed [default %s]: ", defaultseed);
240 fflush(stdout);
241 fgets(seed, sizeof(seed), stdin);
242 rip(seed);
243 for (p = seed; *p; p++) {
244 if (isalpha((unsigned char)*p)) {
245 *p = tolower((unsigned char)*p);
246 } else if (!isdigit((unsigned char)*p)) {
247 (void)puts("Error: seed may only contain alphanumeric characters");
248 break;
249 }
250 }
251 if (*p == '\0')
252 break; /* Valid seed */
253 }
254 if (strlen(seed) > SKEY_MAX_SEED_LEN) {
255 printf("Notice: Seed truncated to %d characters.\n", SKEY_MAX_SEED_LEN);
256 seed[SKEY_MAX_SEED_LEN] = '\0';
257 }
258 if (seed[0] == '\0')
259 (void)strlcpy(seed, defaultseed, sizeof(seed));
260
261 for (i = 0;; i++) {
262 if (i >= 2)
263 exit(1);
264
265 printf("otp-%s %d %s\ns/key access password: ",
266 skey_get_algorithm(), n, seed);
267 fgets(buf, sizeof(buf), stdin);
268 rip(buf);
269 backspace(buf);
270
271 if (buf[0] == '?') {
272 puts("Enter 6 English words from secure S/Key calculation.");
273 continue;
274 } else if (buf[0] == '\0') {
275 exit(1);
276 }
277 if (etob(key, buf) == 1 || atob8(key, buf) == 0)
278 break; /* Valid format */
279 (void)puts("Invalid format - try again with 6 English words.");
280 }
281 } else {
282 /* Get user's secret password */
283 puts("Reminder - Only use this method if you are directly connected\n"
284 " or have an encrypted channel. If you are using telnet\n"
285 " or rlogin, exit with no password and use skeyinit -s.\n");
286
287 for (i = 0;; i++) {
288 if (i >= 2)
289 exit(1);
290
291 if (!argkey) {
292 printf("Enter secret password: ");
293 readpass(passwd, sizeof(passwd));
294 if (passwd[0] == '\0')
295 exit(1);
296 }
297
298 if (strlen(passwd) < SKEY_MIN_PW_LEN) {
299 (void)fprintf(stderr,
300 "Your password must be at least %d characters long.\n", SKEY_MIN_PW_LEN);
301 continue;
302 } else if (strcmp(passwd, pp->pw_name) == 0) {
303 (void)fputs("Your password may not be the same as your user name.\n", stderr);
304 continue;
305 }
306 #if 0
307 else if (strspn(passwd, "abcdefghijklmnopqrstuvwxyz") == strlen(passwd)) {
308 (void)fputs("Your password must contain more than just lower case letters.\n"
309 "Whitespace, numbers, and puctuation are suggested.\n", stderr);
310 continue;
311 }
312 #endif
313
314 if (!argkey) {
315 printf("Again secret password: ");
316 readpass(passwd2, sizeof(passwd));
317 if (passwd2[0] == '\0')
318 exit(1);
319 }
320
321 if (strcmp(passwd, passwd2) == 0)
322 break;
323
324 puts("Passwords do not match.");
325 }
326
327 /* Crunch seed and password into starting key */
328 (void)strlcpy(seed, defaultseed, sizeof(seed));
329 if (keycrunch(key, seed, passwd) != 0)
330 err(2, "key crunch failed");
331 nn = n;
332 while (nn-- != 0)
333 f(key);
334 }
335 (void)time(&now);
336 tm = localtime(&now);
337 (void)strftime(tbuf, sizeof(tbuf), " %b %d,%Y %T", tm);
338
339 if ((skey.val = (char *)malloc(16 + 1)) == NULL)
340 err(1, "Can't allocate memory");
341
342 /* Zero out old key if necessary (entry would change size) */
343 if (zerokey) {
344 (void)skeyzero(&skey, pp->pw_name);
345 /* Re-open keys file and seek to the end */
346 if (skeylookup(&skey, pp->pw_name) == -1)
347 err(1, "cannot open database");
348 }
349
350 btoa8(skey.val, key);
351
352 /*
353 * Obtain an exclusive lock on the key file so we don't
354 * clobber someone authenticating themselves at the same time.
355 */
356 for (i = 0; i < 300; i++) {
357 if ((rval = flock(fileno(skey.keyfile), LOCK_EX|LOCK_NB)) == 0
358 || errno != EWOULDBLOCK)
359 break;
360 usleep(100000); /* Sleep for 0.1 seconds */
361 }
362 if (rval == -1) { /* Can't get exclusive lock */
363 errno = EAGAIN;
364 err(1, "cannot open database");
365 }
366
367 /* Don't save algorithm type for md4 (keep record length same) */
368 if (strcmp(skey_get_algorithm(), "md4") == 0)
369 (void)fprintf(skey.keyfile, "%s %04d %-16s %s %-21s\n",
370 pp->pw_name, n, seed, skey.val, tbuf);
371 else
372 (void)fprintf(skey.keyfile, "%s %s %04d %-16s %s %-21s\n",
373 pp->pw_name, skey_get_algorithm(), n, seed, skey.val, tbuf);
374
375 (void)fclose(skey.keyfile);
376
377 (void)printf("\nID %s skey is otp-%s %d %s\n", pp->pw_name,
378 skey_get_algorithm(), n, seed);
379 (void)printf("Next login password: %s\n\n",
380 hexmode ? put8(buf, key) : btoe(buf, key));
381
382 return(0);
383 }
NetBSD on the FriendlyARM MINI2440