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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: yp_passwd.c,v 1.32 2009/10/27 23:59:41 deraadt Exp $	*/

/*
 * Copyright (c) 1988 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. 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.
 */

#ifdef	YP

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <time.h>
#include <pwd.h>
#include <err.h>
#include <errno.h>
#include <ctype.h>
#include <login_cap.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#define passwd yp_passwd_rec
#include <rpcsvc/yppasswd.h>
#undef passwd

#ifndef _PASSWORD_LEN
#define _PASSWORD_LEN PASS_MAX
#endif

extern int	pwd_gensalt(char *, int, login_cap_t *, char);
extern int	pwd_check(login_cap_t *, char *);
extern int	pwd_gettries(login_cap_t *);
extern void	kbintr(int);
int		yp_passwd(char *);

char		*ypgetnewpasswd(struct passwd *, login_cap_t *, char **);
struct passwd	*ypgetpwnam(char *, int);
struct passwd	*interpret(struct passwd *, char *, int);

char *domain;

static int
pw_error(char *name, int error, int eval)
{
	if (error) {
		if (name)
			warn("%s", name);
		else
			warn(NULL);
	}

	warnx("YP passwd database: unchanged.");
	exit(eval);
}

int
yp_passwd(char *username)
{
	struct yppasswd yppwd;
	int r, rpcport, status, secure=0;
	struct passwd *pw;
	struct timeval tv;
	login_cap_t *lc;
	CLIENT *client;
	char *master;
	uid_t uid;

	/*
	 * Get local domain
	 */
	if ((r = yp_get_default_domain(&domain)) != 0) {
		warnx("can't get local YP domain. Reason: %s",
		    yperr_string(r));
		return (1);
	}

	/*
	 * Find the host for the passwd map; it should be running
	 * the daemon.
	 */
	if ((r = yp_master(domain, "master.passwd.byname", &master)) == 0) {
		secure=1;
	} else if ((r = yp_master(domain, "passwd.byname", &master)) != 0) {
		warnx("can't find the master YP server. Reason: %s",
		    yperr_string(r));
		return (1);
	}

	/*
	 * Ask the portmapper for the port of the daemon.
	 */
	if ((rpcport = getrpcport(master, YPPASSWDPROG,
	    YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0) {
		warnx("master YP server not running yppasswd daemon.");
		warnx("Can't change password.");
		return (1);
	}

	/*
	 * Be sure the port is privileged
	 */
	if (rpcport >= IPPORT_RESERVED) {
		warnx("yppasswd daemon is on an invalid port.");
		return (1);
	}

	/* Get user's login identity */
	if (!(pw = ypgetpwnam(username, secure))) {
		warnx("unknown user %s.", username);
		return (1);
	}
	if ((lc = login_getclass(pw->pw_class)) == NULL) {
		warnx("unable to get login class for user %s.", username);
		return (1);
	}

	uid = getuid();
	if (uid && uid != pw->pw_uid) {
		warnx("you may only change your own password: %s",
		    strerror(EACCES));
		return (1);
	}

	/* prompt for new password */
	yppwd.newpw.pw_passwd = ypgetnewpasswd(pw, lc, &yppwd.oldpass);

	/* tell rpc.yppasswdd */
	yppwd.newpw.pw_name	= pw->pw_name;
	yppwd.newpw.pw_uid	= pw->pw_uid;
	yppwd.newpw.pw_gid	= pw->pw_gid;
	yppwd.newpw.pw_gecos = pw->pw_gecos;
	yppwd.newpw.pw_dir	= pw->pw_dir;
	yppwd.newpw.pw_shell	= pw->pw_shell;

	client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
	if (client==NULL) {
		warnx("cannot contact yppasswdd on %s: Reason: %s",
		    master, yperr_string(YPERR_YPBIND));
		free(yppwd.newpw.pw_passwd);
		return (YPERR_YPBIND);
	}
	client->cl_auth = authunix_create_default();
	tv.tv_sec = 2;
	tv.tv_usec = 0;
	r = clnt_call(client, YPPASSWDPROC_UPDATE,
	    xdr_yppasswd, &yppwd, xdr_int, &status, tv);
	if (r) {
		printf("rpc to yppasswdd failed.\n");
		free(yppwd.newpw.pw_passwd);
		return (1);
	} else if (status) {
		printf("Couldn't change YP password.\n");
		free(yppwd.newpw.pw_passwd);
		return (1);
	} else {
		printf("The YP password has been changed on %s, "
	 	    "the master YP passwd server.\n", master);
		free(yppwd.newpw.pw_passwd);
		return (0);
	}
}

char *
ypgetnewpasswd(struct passwd *pw, login_cap_t *lc, char **old_pass)
{
	static char buf[_PASSWORD_LEN+1];
	char salt[_PASSWORD_LEN];
	sig_t saveint, savequit;
	int tries, pwd_tries;
	char *p;

	saveint = signal(SIGINT, kbintr);
	savequit = signal(SIGQUIT, kbintr);

	printf("Changing YP password for %s.\n", pw->pw_name);
	if (old_pass) {
		*old_pass = NULL;

		if (pw->pw_passwd[0]) {
			p = getpass("Old password:");
			if (p == NULL ||
			    strcmp(crypt(p, pw->pw_passwd), pw->pw_passwd)) {
				errno = EACCES;
				pw_error(NULL, 1, 1);
			}
		} else
			p = "";
		*old_pass = strdup(p);
		if (*old_pass == NULL)
			pw_error(NULL, 1, 1);
	}

	pwd_tries = pwd_gettries(lc);

	for (buf[0] = '\0', tries = 0;;) {
		p = getpass("New password:");
		if (p == NULL || *p == '\0')
			pw_error(NULL, 0, p == NULL ? 1 : 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(lc, p) == 0)
			continue;
		strlcpy(buf, p, sizeof buf);
		p = getpass("Retype new password:");
		if (p != NULL && strcmp(buf, p) == 0)
			break;
		(void)printf("Mismatch; try again, EOF to quit.\n");
	}
	if (!pwd_gensalt(salt, _PASSWORD_LEN, lc, 'y')) {
		(void)printf("Couldn't generate salt.\n");
		pw_error(NULL, 0, 0);
	}
	p = strdup(crypt(buf, salt));
	if (p == NULL)
		pw_error(NULL, 1, 1);
	(void)signal(SIGINT, saveint);
	(void)signal(SIGQUIT, savequit);

	return (p);
}

static char *
pwskip(char *p)
{
	while (*p && *p != ':' && *p != '\n')
		++p;
	if (*p)
		*p++ = 0;
	return (p);
}

struct passwd *
interpret(struct passwd *pwent, char *line, int secure)
{
	char	*p = line;

	pwent->pw_passwd = "*";
	pwent->pw_uid = 0;
	pwent->pw_gid = 0;
	pwent->pw_gecos = "";
	pwent->pw_dir = "";
	pwent->pw_shell = "";
	pwent->pw_change = 0;
	pwent->pw_expire = 0;
	pwent->pw_class = "";

	/* line without colon separators is no good, so ignore it */
	if (!strchr(p, ':'))
		return (NULL);

	pwent->pw_name = p;
	p = pwskip(p);
	pwent->pw_passwd = p;
	p = pwskip(p);
	pwent->pw_uid = (uid_t)strtoul(p, NULL, 10);
	p = pwskip(p);
	pwent->pw_gid = (gid_t)strtoul(p, NULL, 10);
	p = pwskip(p);
	if ( secure == 1 ) {
		pwent->pw_class = p;
		p = pwskip(p);
		pwent->pw_change = (time_t)strtoul(p, NULL, 10);
		p = pwskip(p);
		pwent->pw_expire = (time_t)strtoul(p, NULL, 10);
		p = pwskip(p);
	}
	pwent->pw_gecos = p;
	p = pwskip(p);
	pwent->pw_dir = p;
	p = pwskip(p);
	pwent->pw_shell = p;
	while (*p && *p != '\n')
		p++;
	*p = '\0';
	return (pwent);
}

static char *__yplin;

struct passwd *
ypgetpwnam(char *nam, int secure)
{
	static struct passwd pwent;
	int reason, vallen;
	char *val;

	reason = yp_match(domain,
	    secure ? "master.passwd.byname" : "passwd.byname",
	    nam, strlen(nam), &val, &vallen);
	switch (reason) {
	case 0:
		break;
	default:
		return (NULL);
	}
	val[vallen] = '\0';
	if (__yplin)
		free(__yplin);
	__yplin = (char *)malloc(vallen + 1);
	if (__yplin == NULL)
		pw_error(NULL, 1, 1);
	strlcpy(__yplin, val, vallen + 1);
	free(val);

	return (interpret(&pwent, __yplin, secure));
}

#endif	/* YP */