/*	$OpenBSD: pw_check.c,v 1.1 1997/12/15 17:56:23 art Exp $	*/
/* $KTH: pw_check.c,v 1.13 1997/04/01 08:17:50 joda Exp $ */

/*
 * Copyright (c) 1995, 1996, 1997 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the Kungliga Tekniska
 *      Högskolan and its contributors.
 * 
 * 4. 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 "kadm_locl.h"

/*
 * kadm_pw_check
 *
 * pw		: new password or "" if none passed
 * newkey	: key for pw as passed from client
 * strings	: interesting strings to check for
 *
 * returns NULL if pw is ok, else an explanatory string
 */
int
kadm_pw_check(char *pw, des_cblock *newkey, char **pw_msg, 
	      char **strings)
{
    des_cblock pwkey;
    int status=KADM_SUCCESS;
    
    if (pw == NULL || *pw == '\0')
	return status;		/* XXX - Change this later */
    
#ifndef NO_PW_CHECK
    *pw_msg = NULL;
    des_string_to_key(pw, &pwkey); /* Check AFS string to key also! */
    if (memcmp(pwkey, *newkey, sizeof(pwkey)) != 0)
    {
	/* no password or bad key */
	status=KADM_PW_MISMATCH;
	*pw_msg = "Password doesn't match supplied DES key";
    }
    else if (strlen(pw) < MIN_KPW_LEN)
    {
	status = KADM_INSECURE_PW;
	*pw_msg="Password is too short";
    }
    
#ifdef DICTPATH
    *pw_msg = FascistCheck(pw, DICTPATH, strings);
    if (*pw_msg)
	return KADM_INSECURE_PW;
#endif
    
    memset(pwkey, 0, sizeof(pwkey));
#endif
    
    return status;
}