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Minor interface changes to allow code reuse in login_chpass(8) and
login_lchpass(8)

/*	$OpenBSD: local_passwd.c,v 1.13 2000/12/12 02:19:58 millert 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 1.13 2000/12/12 02:19:58 millert 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, authenticated)
	char *uname;
	int authenticated;
{
	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 = authenticated ? pw->pw_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, authenticated);
	pw->pw_change = 0;
	pw_copy(pfd, tfd, pw);

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

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

	if (!authenticated) {
		(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;
		strlcpy(buf, p, sizeof(buf));
		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));
}