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/*
* Copyright 1987, 1988 by the Massachusetts Institute of Technology.
* For copying and distribution information, please see the file
* <Copyright.MIT>.
*
* Routine to initialize user to Kerberos. Prompts optionally for
* user, instance and realm. Authenticates user and gets a ticket
* for the Kerberos ticket-granting service for future use.
*
* Options are:
*
* -i[instance]
* -r[realm]
* -v[erbose]
* -l[ifetime]
*
* from: kinit.c,v 4.12 90/03/20 16:11:15 jon Exp $
* $Id: kinit.c,v 1.4 1995/09/07 21:37:29 markm Exp $
*/
#if 0
#ifndef lint
static char rcsid[] =
"$Id: kinit.c,v 1.4 1995/09/07 21:37:29 markm Exp $";
#endif lint
#endif
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <pwd.h>
#include <krb.h>
#ifndef ORGANIZATION
#define ORGANIZATION "MIT Project Athena"
#endif /*ORGANIZATION*/
#ifdef PC
#define LEN 64 /* just guessing */
#endif PC
#if defined(BSD42) || defined(__FreeBSD__) || defined(__NetBSD__)
#include <strings.h>
#include <sys/param.h>
#if defined(ultrix) || defined(sun)
#define LEN 64
#else
#define LEN MAXHOSTNAMELEN
#endif /* defined(ultrix) || defined(sun) */
#endif /* BSD42 */
#define LIFE 96 /* lifetime of ticket in 5-minute units */
char *progname;
void usage(void);
void
get_input(s, size, stream)
char *s;
int size;
FILE *stream;
{
char *p;
if (fgets(s, size, stream) == NULL)
exit(1);
if ((p = index(s, '\n')) != NULL)
*p = '\0';
}
int
main(argc, argv)
int argc;
char *argv[];
{
char aname[ANAME_SZ];
char inst[INST_SZ];
char realm[REALM_SZ];
char buf[LEN];
char *username = NULL;
int iflag, rflag, vflag, lflag, lifetime, k_errno;
register char *cp;
register i;
*inst = *realm = '\0';
iflag = rflag = vflag = lflag = 0;
lifetime = LIFE;
progname = (cp = rindex(*argv, '/')) ? cp + 1 : *argv;
while (--argc) {
if ((*++argv)[0] != '-') {
if (username)
usage();
username = *argv;
continue;
}
for (i = 1; (*argv)[i] != '\0'; i++)
switch ((*argv)[i]) {
case 'i': /* Instance */
++iflag;
continue;
case 'r': /* Realm */
++rflag;
continue;
case 'v': /* Verbose */
++vflag;
continue;
case 'l':
++lflag;
continue;
default:
usage();
exit(1);
}
}
if (username &&
(k_errno = kname_parse(aname, inst, realm, username))
!= KSUCCESS) {
fprintf(stderr, "%s: %s\n", progname, krb_err_txt[k_errno]);
iflag = rflag = 1;
username = NULL;
}
if (k_gethostname(buf, LEN)) {
fprintf(stderr, "%s: k_gethostname failed\n", progname);
exit(1);
}
printf("%s (%s)\n", ORGANIZATION, buf);
if (username) {
printf("Kerberos Initialization for \"%s", aname);
if (*inst)
printf(".%s", inst);
if (*realm)
printf("@%s", realm);
printf("\"\n");
} else {
if (iflag) {
printf("Kerberos Initialization\n");
printf("Kerberos name: ");
get_input(aname, sizeof(aname), stdin);
} else {
int uid = getuid();
char *getenv();
struct passwd *pwd;
/* default to current user name unless running as root */
if (uid == 0 && (username = getenv("USER")) &&
strcmp(username, "root") != 0) {
strncpy(aname, username, sizeof(aname));
strncpy(inst, "root", sizeof(inst));
} else {
pwd = getpwuid(uid);
if (pwd == (struct passwd *) NULL) {
fprintf(stderr, "Unknown name for your uid\n");
printf("Kerberos name: ");
get_input(aname, sizeof(aname), stdin);
} else
strncpy(aname, pwd->pw_name, sizeof(aname));
}
}
if (!*aname)
exit(0);
if (!k_isname(aname)) {
fprintf(stderr, "%s: bad Kerberos name format\n",
progname);
exit(1);
}
}
/* optional instance */
if (iflag) {
printf("Kerberos instance: ");
get_input(inst, sizeof(inst), stdin);
if (!k_isinst(inst)) {
fprintf(stderr, "%s: bad Kerberos instance format\n",
progname);
exit(1);
}
}
if (rflag) {
printf("Kerberos realm: ");
get_input(realm, sizeof(realm), stdin);
if (!k_isrealm(realm)) {
fprintf(stderr, "%s: bad Kerberos realm format\n",
progname);
exit(1);
}
}
if (lflag) {
printf("Kerberos ticket lifetime (minutes): ");
get_input(buf, sizeof(buf), stdin);
lifetime = atoi(buf);
if (lifetime < 5)
lifetime = 1;
else
lifetime /= 5;
/* This should be changed if the maximum ticket lifetime */
/* changes */
if (lifetime > 255)
lifetime = 255;
}
if (!*realm && krb_get_lrealm(realm, 1)) {
fprintf(stderr, "%s: krb_get_lrealm failed\n", progname);
exit(1);
}
k_errno = krb_get_pw_in_tkt(aname, inst, realm, "krbtgt", realm,
lifetime, 0);
if (vflag) {
printf("Kerberos realm %s:\n", realm);
printf("%s\n", krb_err_txt[k_errno]);
} else if (k_errno) {
fprintf(stderr, "%s: %s\n", progname, krb_err_txt[k_errno]);
exit(1);
}
return 0;
}
void
usage()
{
fprintf(stderr, "Usage: %s [-irvl] [name]\n", progname);
exit(1);
}
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