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Adapt for our use

/*
 * Copyright (c) 1997-2000 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/uio.h>
#include <unistd.h>
#include <pwd.h>
#include <sys/time.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <dlfcn.h>
#include <util.h>
#include <err.h>
#include <kerberosV/krb5.h>

/* RCSID("$KTH: kpasswd.c,v 1.23 2000/12/31 07:48:34 assar Exp $"); */

int
krb5_passwd (int argc, char **argv)
{
    krb5_error_code ret;
    krb5_context context;
    krb5_principal principal;
    krb5_get_init_creds_opt opt;
    krb5_creds cred;
    int result_code;
    krb5_data result_code_string, result_string;
    char pwbuf[BUFSIZ];

    krb5_get_init_creds_opt_init (&opt);
    
    krb5_get_init_creds_opt_set_tkt_life (&opt, 300);
    krb5_get_init_creds_opt_set_forwardable (&opt, FALSE);
    krb5_get_init_creds_opt_set_proxiable (&opt, FALSE);

    ret = krb5_init_context (&context);
    if (ret)
	errx (1, "krb5_init_context failed: %d", ret);
  
    if(argv[0]) {
	ret = krb5_parse_name (context, argv[0], &principal);
	if (ret)
	    krb5_err (context, 1, ret, "krb5_parse_name");
    } else
	principal = NULL;

    ret = krb5_get_init_creds_password (context,
					&cred,
					principal,
					NULL,
					krb5_prompter_posix,
					NULL,
					0,
					"kadmin/changepw",
					&opt);
    switch (ret) {
    case 0:
	break;
    case KRB5_LIBOS_PWDINTR :
	return 1;
    case KRB5KRB_AP_ERR_BAD_INTEGRITY :
    case KRB5KRB_AP_ERR_MODIFIED :
	krb5_errx(context, 1, "Password incorrect");
	break;
    default:
	krb5_err(context, 1, ret, "krb5_get_init_creds");
    }

    krb5_data_zero (&result_code_string);
    krb5_data_zero (&result_string);

    if(des_read_pw_string (pwbuf, sizeof(pwbuf), "New password: ", 1) != 0)
	return 1;

    ret = krb5_change_password (context, &cred, pwbuf,
				&result_code,
				&result_code_string,
				&result_string);
    if (ret)
	krb5_err (context, 1, ret, "krb5_change_password");

    printf ("Reply from server: %.*s\n", (int)result_string.length,
	    (char *)result_string.data);

    krb5_data_free (&result_code_string);
    krb5_data_free (&result_string);
    
    krb5_free_creds_contents (context, &cred);
    krb5_free_context (context);
    return result_code;
}