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NetBSD/usr.bin/skeyinit/skeyinit.c

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/* $NetBSD: skeyinit.c,v 1.13 2000/07/07 00:18:29 mjl Exp $ */
/* S/KEY v1.1b (skeyinit.c)
*
* Authors:
* Neil M. Haller <nmh@thumper.bellcore.com>
* Philip R. Karn <karn@chicago.qualcomm.com>
* John S. Walden <jsw@thumper.bellcore.com>
* Scott Chasin <chasin@crimelab.com>
*
* Modifications:
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* S/KEY initialization and seed update
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <utmp.h>
#include <skey.h>
#ifndef SKEY_NAMELEN
#define SKEY_NAMELEN 4
#endif
int main __P((int, char **));
int main(int argc, char **argv)
{
int rval, nn, i, l;
int n = 0, defaultsetup = 1, zerokey = 0, hexmode = 0;
time_t now;
char hostname[MAXHOSTNAMELEN + 1];
char seed[SKEY_MAX_PW_LEN+2], key[SKEY_BINKEY_SIZE], defaultseed[SKEY_MAX_SEED_LEN+1];
char passwd[SKEY_MAX_PW_LEN+2], passwd2[SKEY_MAX_PW_LEN+2], tbuf[27], buf[80];
char lastc, me[UT_NAMESIZE+1], *p, *pw, *ht = NULL;
const char *salt;
struct skey skey;
struct passwd *pp;
struct tm *tm;
int c;
if (geteuid() != 0)
errx(1, "must be setuid root.");
if (gethostname(hostname, sizeof(hostname)) < 0)
err(1, "gethostname");
(void)strncpy(defaultseed, hostname, sizeof(defaultseed)- 1);
defaultseed[SKEY_NAMELEN] = '\0';
(void)time(&now);
(void)sprintf(tbuf, "%05ld", (long) (now % 100000));
(void)strncat(defaultseed, tbuf, sizeof(defaultseed) - 5);
if ((pp = getpwuid(getuid())) == NULL)
err(1, "no user with uid %ld", (u_long)getuid());
(void)strncpy(me, pp->pw_name, sizeof(me) - 1);
if ((pp = getpwnam(me)) == NULL)
err(1, "Who are you?");
salt = pp->pw_passwd;
while((c = getopt(argc, argv, "n:t:sxz")) != -1) {
switch(c) {
case 'n':
n = atoi(optarg);
if(n < 1 || n > SKEY_MAX_SEQ)
errx(1, "count must be between 1 and %d", SKEY_MAX_SEQ);
break;
case 't':
if(skey_set_algorithm(optarg) == NULL)
errx(1, "Unknown hash algorithm %s", optarg);
ht = optarg;
break;
case 's':
defaultsetup = 0;
break;
case 'x':
hexmode = 1;
break;
case 'z':
zerokey = 1;
break;
default:
err(1, "Usage: %s [-n count] [-t md4|md5|sha1] [-s] [-x] [-z] [user]\n", argv[0]);
}
}
if(argc > optind) {
pp = getpwnam(argv[optind]);
if (pp == NULL)
errx(1, "User %s unknown", argv[optind]);
}
if (strcmp(pp->pw_name, me) != 0) {
if (getuid() != 0) {
/* Only root can change other's passwds */
errx(1, "Permission denied.");
}
}
if (getuid() != 0) {
pw = getpass("Password:");
p = crypt(pw, salt);
if (strcmp(p, pp->pw_passwd)) {
errx(1, "Password incorrect.");
}
}
rval = skeylookup(&skey, pp->pw_name);
switch (rval) {
case -1:
err(1, "cannot open database");
case 0:
/* comment out user if asked to */
if (zerokey)
exit(skeyzero(&skey, pp->pw_name));
printf("[Updating %s]\n", pp->pw_name);
printf("Old key: [%s] %s\n", skey_get_algorithm(), skey.seed);
/*
* lets be nice if they have a skey.seed that
* ends in 0-8 just add one
*/
l = strlen(skey.seed);
if (l > 0) {
lastc = skey.seed[l - 1];
if (isdigit((unsigned char)lastc) && lastc != '9') {
(void)strncpy(defaultseed, skey.seed,
sizeof(defaultseed) - 1);
defaultseed[l - 1] = lastc + 1;
}
if (isdigit((unsigned char)lastc) && lastc == '9' &&
l < 16) {
(void)strncpy(defaultseed, skey.seed,
sizeof(defaultseed) - 1);
defaultseed[l - 1] = '0';
defaultseed[l] = '0';
defaultseed[l + 1] = '\0';
}
}
break;
case 1:
if (zerokey)
errx(1, "You have no entry to zero.");
printf("[Adding %s]\n", pp->pw_name);
break;
}
if(n==0)
n = 99;
/* Set hash type if asked to */
if (ht) {
/* Need to zero out old key when changing algorithm */
if (strcmp(ht, skey_get_algorithm()) && skey_set_algorithm(ht))
zerokey = 1;
}
if (!defaultsetup) {
printf("You need the 6 english words generated from the \"skey\" command.\n");
for (i = 0;; i++) {
if (i >= 2)
exit(1);
printf("Enter sequence count from 1 to %d: ", SKEY_MAX_SEQ);
fgets(buf, sizeof(buf), stdin);
n = atoi(buf);
if (n > 0 && n < SKEY_MAX_SEQ)
break; /* Valid range */
printf("\nError: Count must be between 0 and %d\n", SKEY_MAX_SEQ);
}
for (i = 0;; i++) {
if (i >= 2)
exit(1);
printf("Enter new seed [default %s]: ", defaultseed);
fflush(stdout);
fgets(seed, sizeof(seed), stdin);
rip(seed);
for (p = seed; *p; p++) {
if (isalpha(*p)) {
if (isupper(*p))
*p = tolower(*p);
} else if (!isdigit(*p)) {
(void)puts("Error: seed may only contain alphanumeric characters");
break;
}
}
if (*p == '\0')
break; /* Valid seed */
}
if (strlen(seed) > SKEY_MAX_SEED_LEN) {
printf("Notice: Seed truncated to %d characters.\n", SKEY_MAX_SEED_LEN);
seed[SKEY_MAX_SEED_LEN] = '\0';
}
if (seed[0] == '\0')
(void)strcpy(seed, defaultseed);
for (i = 0;; i++) {
if (i >= 2)
exit(1);
printf("otp-%s %d %s\ns/key access password: ",
skey_get_algorithm(), n, seed);
fgets(buf, sizeof(buf), stdin);
rip(buf);
backspace(buf);
if (buf[0] == '?') {
puts("Enter 6 English words from secure S/Key calculation.");
continue;
} else if (buf[0] == '\0') {
exit(1);
}
if (etob(key, buf) == 1 || atob8(key, buf) == 0)
break; /* Valid format */
(void)puts("Invalid format - try again with 6 English words.");
}
} else {
/* Get user's secret password */
puts("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 skeyinit -s.\n");
for (i = 0;; i++) {
if (i >= 2)
exit(1);
printf("Enter secret password: ");
readpass(passwd, sizeof(passwd));
if (passwd[0] == '\0')
exit(1);
if (strlen(passwd) < SKEY_MIN_PW_LEN) {
(void)fprintf(stderr,
"Your password must be at least %d characters long.\n", SKEY_MIN_PW_LEN);
continue;
} else if (strcmp(passwd, pp->pw_name) == 0) {
(void)fputs("Your password may not be the same as your user name.\n", stderr);
continue;
}
#if 0
else if (strspn(passwd, "abcdefghijklmnopqrstuvwxyz") == strlen(passwd)) {
(void)fputs("Your password must contain more than just lower case letters.\n"
"Whitespace, numbers, and puctuation are suggested.\n", stderr);
continue;
}
#endif
printf("Again secret password: ");
readpass(passwd2, sizeof(passwd));
if (passwd2[0] == '\0')
exit(1);
if (strcmp(passwd, passwd2) == 0)
break;
puts("Passwords do not match.");
}
/* Crunch seed and password into starting key */
(void)strcpy(seed, defaultseed);
if (keycrunch(key, seed, passwd) != 0)
err(2, "key crunch failed");
nn = n;
while (nn-- != 0)
f(key);
}
(void)time(&now);
tm = localtime(&now);
(void)strftime(tbuf, sizeof(tbuf), " %b %d,%Y %T", tm);
if ((skey.val = (char *)malloc(16 + 1)) == NULL)
err(1, "Can't allocate memory");
/* Zero out old key if necesary (entry would change size) */
if (zerokey) {
(void)skeyzero(&skey, pp->pw_name);
/* Re-open keys file and seek to the end */
if (skeylookup(&skey, pp->pw_name) == -1)
err(1, "cannot open database");
}
btoa8(skey.val, key);
/*
* Obtain an exclusive lock on the key file so we don't
* clobber someone authenticating themselves at the same time.
*/
for (i = 0; i < 300; i++) {
if ((rval = flock(fileno(skey.keyfile), LOCK_EX|LOCK_NB)) == 0
|| errno != EWOULDBLOCK)
break;
usleep(100000); /* Sleep for 0.1 seconds */
}
if (rval == -1) { /* Can't get exclusive lock */
errno = EAGAIN;
err(1, "cannot open database");
}
/* Don't save algorithm type for md4 (keep record length same) */
if (strcmp(skey_get_algorithm(), "md4") == 0)
(void)fprintf(skey.keyfile, "%s %04d %-16s %s %-21s\n",
pp->pw_name, n, seed, skey.val, tbuf);
else
(void)fprintf(skey.keyfile, "%s %s %04d %-16s %s %-21s\n",
pp->pw_name, skey_get_algorithm(), n, seed, skey.val, tbuf);
(void)fclose(skey.keyfile);
(void)printf("\nID %s skey is otp-%s %d %s\n", pp->pw_name,
skey_get_algorithm(), n, seed);
(void)printf("Next login password: %s\n\n",
hexmode ? put8(buf, key) : btoe(buf, key));
return(0);
}
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