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various cleanups; ok millert

/*	$OpenBSD: krb_passwd.c,v 1.16 2002/06/28 22:28:17 deraadt 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);
extern int get_pw_new_pwd(char *pword, int pwlen, krb_principal *pr,
    int print_realm);

int
krb_passwd(int argc, char **argv)
{
	char pword[MAX_KPW_LEN], tktstring[MAXPATHLEN];
	krb_principal default_principal;
	krb_principal 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 */
	int c;

	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))
				strlcpy(principal.name, optarg,
				    sizeof(principal.name));
			else {
				warnx("Bad name: %s", optarg);
				usage(1);
			}
			break;
		case 'i':
			if (k_isinst(optarg))
				strlcpy(principal.instance, optarg,
				    sizeof(principal.instance));
			else {
				warnx("Bad instance: %s", optarg);
				usage(1);
			}
			break;
		case 'r':
			if (k_isrealm(optarg)) {
				strlcpy(principal.realm, optarg,
				    sizeof(principal.realm));
				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) {
		strlcpy(principal.name, default_principal.name, ANAME_SZ);
		strlcpy(principal.instance, default_principal.instance, INST_SZ);
		strlcpy(principal.realm, default_principal.realm, REALM_SZ);
	} else {
		if (!principal.name[0])
			strlcpy(principal.name, default_principal.name, ANAME_SZ);
		if (!principal.realm[0])
			strlcpy(principal.realm, default_principal.realm, REALM_SZ);
	}

	snprintf(tktstring, sizeof(tktstring), "%s_cpw_%ld",
	    TKT_ROOT, (long)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 */