Annotation of src/usr.bin/skeyinit/skeyinit.c, Revision 1.8
1.8 ! millert 1: /* $OpenBSD: skeyinit.c,v 1.7 1996/09/29 04:34:08 millert Exp $ */
1.1 deraadt 2: /* $NetBSD: skeyinit.c,v 1.6 1995/06/05 19:50:48 pk Exp $ */
3:
4: /* S/KEY v1.1b (skeyinit.c)
5: *
6: * Authors:
7: * Neil M. Haller <nmh@thumper.bellcore.com>
8: * Philip R. Karn <karn@chicago.qualcomm.com>
9: * John S. Walden <jsw@thumper.bellcore.com>
10: * Scott Chasin <chasin@crimelab.com>
11: *
12: * S/KEY initialization and seed update
13: */
14:
15: #include <sys/param.h>
16: #include <sys/time.h>
17: #include <sys/resource.h>
18:
19: #include <stdio.h>
20: #include <stdlib.h>
21: #include <string.h>
22: #include <err.h>
23: #include <pwd.h>
24: #include <unistd.h>
25: #include <time.h>
1.6 millert 26: #include <utmp.h>
1.1 deraadt 27: #include <ctype.h>
1.4 millert 28: #include <skey.h>
1.1 deraadt 29:
1.4 millert 30: #ifndef SKEY_MAXSEQ
31: #define SKEY_MAXSEQ 10000
32: #endif
33: #ifndef SKEY_NAMELEN
34: #define SKEY_NAMELEN 4
35: #endif
36: #ifndef SKEY_MIN_PW_LEN
37: #define SKEY_MIN_PW_LEN 4
38: #endif
1.1 deraadt 39:
1.8 ! millert 40: void usage __P((char *));
! 41:
1.1 deraadt 42: int
43: main(argc, argv)
44: int argc;
45: char *argv[];
46: {
1.8 ! millert 47: int rval, n, nn, i, l, defaultsetup=1, zerokey=0, hexmode=0;
1.1 deraadt 48: time_t now;
49: char hostname[MAXHOSTNAMELEN];
50: char seed[18], tmp[80], key[8], defaultseed[17];
51: char passwd[256], passwd2[256], tbuf[27], buf[60];
1.8 ! millert 52: char lastc, me[UT_NAMESIZE+1], *salt, *p, *pw, *ht=NULL;
1.1 deraadt 53: struct skey skey;
54: struct passwd *pp;
55: struct tm *tm;
56:
1.4 millert 57: if (geteuid() != 0)
58: errx(1, "must be setuid root.");
59:
60: (void)time(&now);
1.5 millert 61: (void)sprintf(tbuf, "%05ld", (long) (now % 100000));
1.1 deraadt 62:
63: if (gethostname(hostname, sizeof(hostname)) < 0)
64: err(1, "gethostname");
1.4 millert 65: (void)strncpy(defaultseed, hostname, sizeof(defaultseed) - 1);
66: defaultseed[SKEY_NAMELEN] = '\0';
67: (void)strncat(defaultseed, tbuf, sizeof(defaultseed) - 5);
1.1 deraadt 68:
69: if ((pp = getpwuid(getuid())) == NULL)
70: err(1, "no user with uid %d", getuid());
1.4 millert 71: (void)strcpy(me, pp->pw_name);
1.1 deraadt 72:
73: if ((pp = getpwnam(me)) == NULL)
74: err(1, "Who are you?");
75:
1.8 ! millert 76: for (i = 1; i < argc && argv[i][0] == '-' && strcmp(argv[i], "--");) {
! 77: if (argv[i][2] == '\0') {
! 78: /* Single character switch */
! 79: switch (argv[i][1]) {
1.4 millert 80: case 's':
81: defaultsetup = 0;
82: break;
83: case 'x':
84: hexmode = 1;
85: break;
86: case 'z':
87: zerokey = 1;
88: break;
1.8 ! millert 89: default:
! 90: usage(argv[0]);
! 91: }
! 92: } else {
! 93: /* Multi character switches are hash types */
! 94: if ((ht = skey_set_algorithm(&argv[i][1])) == NULL) {
! 95: warnx("Unknown hash algorithm %s", &argv[i][1]);
! 96: usage(argv[0]);
! 97: }
1.7 millert 98: }
1.8 ! millert 99: i++;
1.7 millert 100: }
101:
102: /* check for optional user string */
1.8 ! millert 103: if (argc - i > 1) {
! 104: usage(argv[0]);
! 105: } else if (argv[i]) {
! 106: if ((pp = getpwnam(argv[i])) == NULL)
1.4 millert 107: err(1, "User unknown");
108:
109: if (strcmp(pp->pw_name, me) != 0) {
110: if (getuid() != 0) {
111: /* Only root can change other's passwds */
112: errx(1, "Permission denied.");
113: }
1.1 deraadt 114: }
115: }
116: salt = pp->pw_passwd;
117:
1.4 millert 118: (void)setpriority(PRIO_PROCESS, 0, -4);
1.1 deraadt 119:
120: if (getuid() != 0) {
1.4 millert 121: (void)setpriority(PRIO_PROCESS, 0, -4);
1.1 deraadt 122:
123: pw = getpass("Password:");
124: p = crypt(pw, salt);
125:
1.4 millert 126: (void)setpriority(PRIO_PROCESS, 0, 0);
1.1 deraadt 127:
1.4 millert 128: if (pp && strcmp(p, pp->pw_passwd))
129: errx(1, "Password incorrect.");
1.1 deraadt 130: }
1.4 millert 131:
1.1 deraadt 132: rval = skeylookup(&skey, pp->pw_name);
133: switch (rval) {
1.4 millert 134: case -1:
135: err(1, "cannot open database");
136: case 0:
137: /* comment out user if asked to */
138: if (zerokey)
139: exit(skeyzero(&skey, pp->pw_name));
140:
141: (void)printf("[Updating %s]\n", pp->pw_name);
142: (void)printf("Old key: %s\n", skey.seed);
143:
144: /*
145: * Lets be nice if they have a skey.seed that
146: * ends in 0-8 just add one
147: */
148: l = strlen(skey.seed);
149: if (l > 0) {
150: lastc = skey.seed[l - 1];
151: if (isdigit(lastc) && lastc != '9') {
152: (void)strcpy(defaultseed, skey.seed);
153: defaultseed[l - 1] = lastc + 1;
154: }
155: if (isdigit(lastc) && lastc == '9' && l < 16) {
156: (void)strcpy(defaultseed, skey.seed);
157: defaultseed[l - 1] = '0';
158: defaultseed[l] = '0';
159: defaultseed[l + 1] = '\0';
160: }
1.1 deraadt 161: }
1.4 millert 162: break;
163: case 1:
164: if (zerokey)
165: errx(1, "You have no entry to zero.");
166: (void)printf("[Adding %s]\n", pp->pw_name);
167: break;
1.1 deraadt 168: }
169: n = 99;
170:
1.8 ! millert 171: /* Set hash type if asked to */
! 172: if (ht)
! 173: skey_set_algorithm(ht);
1.4 millert 174:
1.1 deraadt 175: if (!defaultsetup) {
1.4 millert 176: (void)printf("You need the 6 english words generated from the \"skey\" command.\n");
1.1 deraadt 177: for (i = 0;; i++) {
178: if (i >= 2)
179: exit(1);
1.4 millert 180: (void)printf("Enter sequence count from 1 to %d: ",
181: SKEY_MAXSEQ);
182: (void)fgets(tmp, sizeof(tmp), stdin);
1.1 deraadt 183: n = atoi(tmp);
1.4 millert 184: if (n > 0 && n < SKEY_MAXSEQ)
1.1 deraadt 185: break; /* Valid range */
1.4 millert 186: (void)printf("\n Error: Count must be > 0 and < %d\n",
187: SKEY_MAXSEQ);
1.1 deraadt 188: }
1.4 millert 189:
190: (void)printf("Enter new key [default %s]: ", defaultseed);
191: (void)fflush(stdout);
192: (void)fgets(seed, sizeof(seed), stdin);
1.1 deraadt 193: rip(seed);
194: if (strlen(seed) > 16) {
1.4 millert 195: (void)puts("Notice: Seed truncated to 16 characters.");
1.1 deraadt 196: seed[16] = '\0';
197: }
198: if (seed[0] == '\0')
1.4 millert 199: (void)strcpy(seed, defaultseed);
1.1 deraadt 200:
201: for (i = 0;; i++) {
202: if (i >= 2)
203: exit(1);
204:
1.7 millert 205: (void)printf("skey %d %s\nskey access password: ",
1.4 millert 206: n, seed);
207: (void)fgets(tmp, sizeof(tmp), stdin);
1.1 deraadt 208: rip(tmp);
209: backspace(tmp);
210:
211: if (tmp[0] == '?') {
1.4 millert 212: (void)puts("Enter 6 English words from secure S/Key calculation.");
1.1 deraadt 213: continue;
1.4 millert 214: } else if (tmp[0] == '\0')
1.1 deraadt 215: exit(1);
216: if (etob(key, tmp) == 1 || atob8(key, tmp) == 0)
217: break; /* Valid format */
1.4 millert 218: (void)puts("Invalid format - try again with 6 English words.");
1.1 deraadt 219: }
220: } else {
221: /* Get user's secret password */
1.4 millert 222: fputs("Reminder - Only use this method if you are directly connected\n or have an encrypted channel. If you are using telnet\n or rlogin, exit with no password and use keyinit -s.\n", stderr);
223:
1.1 deraadt 224: for (i = 0;; i++) {
1.4 millert 225: if (i > 2)
1.1 deraadt 226: exit(1);
227:
1.4 millert 228: (void)fputs("Enter secret password: ", stderr);
1.1 deraadt 229: readpass(passwd, sizeof(passwd));
230: if (passwd[0] == '\0')
231: exit(1);
232:
1.4 millert 233: if (strlen(passwd) < SKEY_MIN_PW_LEN) {
234: (void)fputs("Your password must be longer.\n",
235: stderr);
236: continue;
237: }
238:
239: (void)fputs("Again secret password: ", stderr);
1.1 deraadt 240: readpass(passwd2, sizeof(passwd));
241: if (passwd2[0] == '\0')
242: exit(1);
243:
244: if (strcmp(passwd, passwd2) == 0)
245: break;
246:
1.4 millert 247: (void)fputs("Passwords do not match.\n", stderr);
1.1 deraadt 248: }
249:
250: /* Crunch seed and password into starting key */
1.4 millert 251: (void)strcpy(seed, defaultseed);
1.1 deraadt 252: if (keycrunch(key, seed, passwd) != 0)
253: err(2, "key crunch failed");
1.4 millert 254:
1.1 deraadt 255: nn = n;
256: while (nn-- != 0)
257: f(key);
258: }
1.4 millert 259: (void)time(&now);
1.1 deraadt 260: tm = localtime(&now);
1.4 millert 261: (void)strftime(tbuf, sizeof(tbuf), " %b %d,%Y %T", tm);
1.1 deraadt 262:
1.4 millert 263: if ((skey.val = (char *)malloc(16 + 1)) == NULL)
264: err(1, "Can't allocate memory");
1.1 deraadt 265:
266: btoa8(skey.val, key);
267:
1.8 ! millert 268: (void)fprintf(skey.keyfile, "%s %s %04d %-16s %s %-21s\n",
! 269: pp->pw_name, skey_get_algorithm(), n, seed, skey.val, tbuf);
1.4 millert 270: (void)fclose(skey.keyfile);
1.7 millert 271: (void)printf("\nID %s skey is %d %s\n", pp->pw_name, n, seed);
1.4 millert 272: (void)printf("Next login password: %s\n", hexmode ? put8(buf, key) : btoe(buf, key));
1.1 deraadt 273:
1.4 millert 274: exit(0);
1.8 ! millert 275: }
! 276:
! 277: void
! 278: usage(s)
! 279: char *s;
! 280: {
! 281: (void)fprintf(stderr,
! 282: "Usage: %s [-s] [-x] [-z] [-md4|-md5|-sha1] [user]\n", s);
! 283: exit(1);
1.1 deraadt 284: }
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