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integrate password quality checking, disallow all digit passwords motivated
by Solar Designer.  External password checking program can be spawned now,
number of password trials configurable.  work by me and Bob Beck.

/*	$OpenBSD: local_passwd.c,v 1.11 2000/08/01 22:27:51 provos Exp $	*/

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * 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 University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */

#ifndef lint
/*static char sccsid[] = "from: @(#)local_passwd.c	5.5 (Berkeley) 5/6/91";*/
static char rcsid[] = "$OpenBSD: local_passwd.c,v 1.11 2000/08/01 22:27:51 provos Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <fcntl.h>
#include <util.h>

static uid_t uid;
extern int pwd_gensalt __P(( char *, int, struct passwd *, char));
extern int pwd_check __P((struct passwd *, char *));
extern int pwd_gettries __P((struct passwd *));

int
local_passwd(uname)
	char *uname;
{
	struct passwd *pw;
	int pfd, tfd;
	char *getnewpasswd();

	if (!(pw = getpwnam(uname))) {
#ifdef YP
		extern int use_yp;
		if (!use_yp)
#endif
		warnx("unknown user %s.", uname);
		return(1);
	}

	uid = getuid();
	if (uid && uid != pw->pw_uid) {
		warnx("login/uid mismatch, username argument required.");
		return(1);
	}

	pw_init();
	tfd = pw_lock(0);
	if (tfd < 0) {
		if (errno == EEXIST)
			errx(1, "the passwd file is busy.");
		else
			err(1, "can't open passwd temp file");
	}
	pfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0);
	if (pfd < 0 || fcntl(pfd, F_SETFD, 1) == -1)
		pw_error(_PATH_MASTERPASSWD, 1, 1);

	/*
	 * Get the new password.  Reset passwd change time to zero; when
	 * classes are implemented, go and get the "offset" value for this
	 * class and reset the timer.
	 */
	pw->pw_passwd = getnewpasswd(pw);
	pw->pw_change = 0;
	pw_copy(pfd, tfd, pw);

	if (pw_mkdb() < 0)
		pw_error((char *)NULL, 0, 1);
	return(0);
}

char *
getnewpasswd(pw)
	register struct passwd *pw;
{
	register char *p, *t;
	int tries, pwd_tries;
	char buf[_PASSWORD_LEN+1], salt[_PASSWORD_LEN], *crypt(), *getpass();

	(void)printf("Changing local password for %s.\n", pw->pw_name);

	if (uid && pw->pw_passwd[0] &&
	    strcmp(crypt(getpass("Old password:"), pw->pw_passwd),
	    pw->pw_passwd)) {
		errno = EACCES;
		pw_error(NULL, 1, 1);
	}
	
	pwd_tries = pwd_gettries(pw);

	for (buf[0] = '\0', tries = 0;;) {
		p = getpass("New password:");
		if (!*p) {
			(void)printf("Password unchanged.\n");
			pw_error(NULL, 0, 0);
		}
		if (strcmp(p, "s/key") == 0) {
			printf("That password collides with a system feature. Choose another.\n");
			continue;
		}
		
		if ((tries++ < pwd_tries || pwd_tries == 0) 
		    && pwd_check(pw, p) == 0)
			continue;
		strncpy(buf, p, sizeof buf-1);
		buf[sizeof buf-1] = '\0';
		if (!strcmp(buf, getpass("Retype new password:")))
			break;
		(void)printf("Mismatch; try again, EOF to quit.\n");
	}
	if( !pwd_gensalt( salt, _PASSWORD_LEN, pw, 'l' )) {
		(void)printf("Couldn't generate salt.\n");
		pw_error(NULL, 0, 0);
	}
	return(crypt(buf, salt));
}