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/* $NetBSD: skeyinit.c,v 1.6 1995/06/05 19:50:48 pk 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>
*
* S/KEY initialization and seed update
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <pwd.h>
#include <unistd.h>
#include <time.h>
#include <ctype.h>
#include "skey.h"
#define NAMELEN 2
int skeylookup __ARGS((struct skey * mp, char *name));
int skeyzero __ARGS((struct skey * mp, char *name));
int
main(argc, argv)
int argc;
char *argv[];
{
int rval, n, nn, i, defaultsetup, l, zerokey = 0;
time_t now;
char hostname[MAXHOSTNAMELEN];
char seed[18], tmp[80], key[8], defaultseed[17];
char passwd[256], passwd2[256], tbuf[27], buf[60];
char lastc, me[80], user[8], *salt, *p, *pw;
struct skey skey;
struct passwd *pp;
struct tm *tm;
time(&now);
tm = localtime(&now);
strftime(tbuf, sizeof(tbuf), "%M%j", tm);
if (gethostname(hostname, sizeof(hostname)) < 0)
err(1, "gethostname");
strncpy(defaultseed, hostname, sizeof(defaultseed)- 1);
defaultseed[4] = '\0';
strncat(defaultseed, tbuf, sizeof(defaultseed) - 5);
if ((pp = getpwuid(getuid())) == NULL)
err(1, "no user with uid %d", getuid());
strcpy(me, pp->pw_name);
if ((pp = getpwnam(me)) == NULL)
err(1, "Who are you?");
defaultsetup = 1;
for (i=1; i < argc; i++) {
if (strcmp("-s", argv[i]) == 0)
defaultsetup = 0;
else if (strcmp("-z", argv[i]) == 0)
zerokey = 1;
else {
pp = getpwnam(argv[i]);
break;
}
}
if (pp == NULL) {
err(1, "User unknown");
}
if (strcmp(pp->pw_name, me) != 0) {
if (getuid() != 0) {
/* Only root can change other's passwds */
printf("Permission denied.\n");
exit(1);
}
}
salt = pp->pw_passwd;
setpriority(PRIO_PROCESS, 0, -4);
if (getuid() != 0) {
setpriority(PRIO_PROCESS, 0, -4);
pw = getpass("Password:");
p = crypt(pw, salt);
setpriority(PRIO_PROCESS, 0, 0);
if (pp && strcmp(p, pp->pw_passwd)) {
printf("Password incorrect.\n");
exit(1);
}
}
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\n", 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(lastc) && lastc != '9') {
strcpy(defaultseed, skey.seed);
defaultseed[l - 1] = lastc + 1;
}
if (isdigit(lastc) && lastc == '9' && l < 16) {
strcpy(defaultseed, skey.seed);
defaultseed[l - 1] = '0';
defaultseed[l] = '0';
defaultseed[l + 1] = '\0';
}
}
break;
case 1:
if (zerokey) {
printf("You have no entry to zero.\n");
exit(1);
}
printf("[Adding %s]\n", pp->pw_name);
break;
}
n = 99;
if (!defaultsetup) {
printf("You need the 6 english words generated from the \"key\" command.\n");
for (i = 0;; i++) {
if (i >= 2)
exit(1);
printf("Enter sequence count from 1 to 10000: ");
fgets(tmp, sizeof(tmp), stdin);
n = atoi(tmp);
if (n > 0 && n < 10000)
break; /* Valid range */
printf("\n Error: Count must be > 0 and < 10000\n");
}
}
if (!defaultsetup) {
printf("Enter new key [default %s]: ", defaultseed);
fflush(stdout);
fgets(seed, sizeof(seed), stdin);
rip(seed);
if (strlen(seed) > 16) {
printf("Notice: Seed truncated to 16 characters.\n");
seed[16] = '\0';
}
if (seed[0] == '\0')
strcpy(seed, defaultseed);
for (i = 0;; i++) {
if (i >= 2)
exit(1);
printf("s/key %d %s\ns/key access password: ", n, seed);
fgets(tmp, sizeof(tmp), stdin);
rip(tmp);
backspace(tmp);
if (tmp[0] == '?') {
printf("Enter 6 English words from secure S/Key calculation.\n");
continue;
}
if (tmp[0] == '\0') {
exit(1);
}
if (etob(key, tmp) == 1 || atob8(key, tmp) == 0)
break; /* Valid format */
printf("Invalid format - try again with 6 English words.\n");
}
} else {
/* Get user's secret password */
for (i = 0;; i++) {
if (i >= 2)
exit(1);
printf("Enter secret password: ");
readpass(passwd, sizeof(passwd));
if (passwd[0] == '\0')
exit(1);
printf("Again secret password: ");
readpass(passwd2, sizeof(passwd));
if (passwd2[0] == '\0')
exit(1);
if (strlen(passwd) < 4 && strlen(passwd2) < 4)
err(1, "Your password must be longer");
if (strcmp(passwd, passwd2) == 0)
break;
printf("Passwords do not match.\n");
}
strcpy(seed, defaultseed);
/* Crunch seed and password into starting key */
if (keycrunch(key, seed, passwd) != 0)
err(2, "key crunch failed");
nn = n;
while (nn-- != 0)
f(key);
}
time(&now);
tm = localtime(&now);
strftime(tbuf, sizeof(tbuf), " %b %d,%Y %T", tm);
skey.val = (char *)malloc(16 + 1);
btoa8(skey.val, key);
fprintf(skey.keyfile, "%s %04d %-16s %s %-21s\n", pp->pw_name, n,
seed, skey.val, tbuf);
fclose(skey.keyfile);
printf("ID %s s/key is %d %s\n", pp->pw_name, n, seed);
printf("Next login password: %s\n", btoe(buf, key));
#ifdef HEXIN
printf("%s\n", put8(buf, key));
#endif
exit(1);
}
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