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TKT_ROOT has changed from a string to a function in newer KerberosIV
versions.
(Ok deraadt@)

/*	$OpenBSD: krb_passwd.c,v 1.13 2000/02/25 22:09:14 hin Exp $	*/
/* $KTH: kpasswd.c,v 1.25 1997/05/02 14:28:51 assar Exp $ */

/*
 * This source code is no longer held under any constraint of USA
 * `cryptographic laws' since it was exported legally.  The cryptographic
 * functions were removed from the code and a "Bones" distribution was
 * made.  A Commodity Jurisdiction Request #012-94 was filed with the
 * USA State Department, who handed it to the Commerce department.  The
 * code was determined to fall under General License GTDA under ECCN 5D96G,
 * and hence exportable.  The cryptographic interfaces were re-added by Eric
 * Young, and then KTH proceeded to maintain the code in the free world.
 *
 */

/* 
 *  Copyright (C) 1989 by the Massachusetts Institute of Technology
 *
 *  Export of this software from the United States of America is assumed
 *  to require a specific license from the United States Government.
 *  It is the responsibility of any person or organization contemplating
 *  export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 *
 */

/*
 * change your password with kerberos
 */

#ifdef KERBEROS

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <des.h>
#include <kerberosIV/krb.h>
#include <kerberosIV/kadm.h>
#include <kerberosIV/kadm_err.h>
#include <netdb.h>
#include <signal.h>
#include <pwd.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <com_err.h>

char realm[REALM_SZ];

extern void usage(int value);

int
krb_passwd(int argc, char **argv)
{
    krb_principal principal;
    krb_principal default_principal;
    int realm_given = 0;	/* True if realm was give on cmdline */
    int use_default = 1;	/* True if we should use default name */
    int status;			/* return code */
    char pword[MAX_KPW_LEN];
    int c;
    char tktstring[MAXPATHLEN];

    seteuid(getuid());
    
    memset (&principal, 0, sizeof(principal));
    memset (&default_principal, 0, sizeof(default_principal));
    
    krb_get_default_principal (default_principal.name,
			       default_principal.instance,
			       default_principal.realm);

    while ((c = getopt(argc, argv, "u:n:i:r:h")) != -1) {
	switch (c) {
	case 'u':
	    status = krb_parse_name (optarg, &principal);
	    if (status != KSUCCESS)
		errx (2, "%s", krb_get_err_text(status));
	    if (principal.realm[0])
		realm_given++;
	    else if (krb_get_lrealm(principal.realm, 1) != KSUCCESS)
		errx (1, "Could not find default realm!");
	    break;
	case 'n':
	    if (k_isname(optarg))
		strncpy(principal.name, optarg, sizeof(principal.name) - 1);
	    else {
		warnx("Bad name: %s", optarg);
		usage(1);
	    }
	    break;
	case 'i':
	    if (k_isinst(optarg))
		strncpy(principal.instance,
			optarg,
			sizeof(principal.instance) - 1);
	    else {
		warnx("Bad instance: %s", optarg);
		usage(1);
	    }
	    break;
	case 'r':
	    if (k_isrealm(optarg)) {
		strncpy(principal.realm, optarg, sizeof(principal.realm) - 1);
		realm_given++; 
	    } else {
		warnx("Bad realm: %s", optarg);
		usage(1);
	    }
	    break;
	case 'h':
	    usage(0);
	    break;
	default:
	    usage(1);
	    break;
	}
	use_default = 0;
    }
    if (optind < argc) {
	use_default = 0;
	status = krb_parse_name (argv[optind], &principal);
	if(status != KSUCCESS)
	    errx (1, "%s", krb_get_err_text (status));
    }

    if (use_default) {
	strncpy(principal.name, default_principal.name, ANAME_SZ - 1);
	principal.name[ANAME_SZ - 1] = '\0';
	strncpy(principal.instance, default_principal.instance, INST_SZ - 1);
	principal.instance[INST_SZ - 1] = '\0';
	strncpy(principal.realm, default_principal.realm, REALM_SZ - 1);
	principal.realm[REALM_SZ - 1] = '\0';
    } else {
	if (!principal.name[0]) {
	    strncpy(principal.name, default_principal.name, ANAME_SZ - 1);
	    principal.name[ANAME_SZ - 1] = '\0';
	}
	if (!principal.realm[0]) {
	    strncpy(principal.realm, default_principal.realm, REALM_SZ - 1);
	    principal.realm[REALM_SZ - 1] = '\0';
	}
    }

    snprintf(tktstring, sizeof(tktstring),
	     "%s_cpw_%u", TKT_ROOT, (unsigned)getpid());
    krb_set_tkt_string(tktstring);
    
    if (get_pw_new_pwd(pword, sizeof(pword), &principal,
		       realm_given)) {
	dest_tkt ();
	exit(1);
    }
    
    status = kadm_init_link (PWSERV_NAME, KRB_MASTER, principal.realm);
    if (status != KADM_SUCCESS) 
	com_err(argv[0], status, "while initializing");
    else {
	des_cblock newkey;
	char *pw_msg; /* message from server */

	des_string_to_key(pword, &newkey);
	status = kadm_change_pw_plain((unsigned char*)&newkey, pword, &pw_msg);
	memset(newkey, 0, sizeof(newkey));
      
	if (status == KADM_INSECURE_PW)
	    warnx ("Insecure password: %s", pw_msg);
	else if (status != KADM_SUCCESS)
	    com_err(argv[0], status, " attempting to change password.");
    }
    memset(pword, 0, sizeof(pword));

    if (status != KADM_SUCCESS)
	fprintf(stderr,"Password NOT changed.\n");
    else
	printf("Password changed.\n");

    dest_tkt();
    if (status)
	return 2;
    else 
	return 0;
}

#endif /* KERBEROS */