NetBSD/usr.bin/passwd/yp_passwd.c

334 lines
7.5 KiB
C

/* $NetBSD: yp_passwd.c,v 1.27 2003/08/07 11:15:27 agc Exp $ */
/*
* Copyright (c) 1988, 1990, 1993, 1994
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)local_passwd.c 8.3 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: yp_passwd.c,v 1.27 2003/08/07 11:15:27 agc Exp $");
#endif
#endif /* not lint */
#ifdef YP
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#include "extern.h"
#define passwd yp_passwd_rec
#include <rpcsvc/yppasswd.h>
#undef passwd
#ifndef _PASSWORD_LEN
#define _PASSWORD_LEN PASS_MAX
#endif
static int yflag;
static char *getnewpasswd __P((struct passwd *, char **));
static int ypgetpwnam __P((const char *));
static void pw_error __P((char *, int, int));
static uid_t uid;
char *domain;
static void
pw_error(name, err, eval)
char *name;
int err, eval;
{
if (err)
warn("%s", name);
errx(eval, "YP passwd database unchanged");
}
int
yp_init(progname)
const char *progname;
{
int yppwd;
if (strcmp(progname, "yppasswd") == 0) {
yppwd = 1;
} else
yppwd = 0;
yflag = 0;
if (_yp_check(NULL) == 0) {
/* can't use YP. */
if (yppwd)
errx(1, "YP not in use.");
return(-1);
}
return (0);
}
int
yp_arg(ch, arg)
char ch;
const char *arg;
{
switch (ch) {
case 'y':
yflag = 1;
break;
default:
return(0);
}
return(1);
}
int
yp_arg_end()
{
if (yflag)
return (PW_USE_FORCE);
return (PW_USE);
}
void
yp_end()
{
/* NOOP */
}
int
yp_chpw(username)
const char *username;
{
char *master;
int r, rpcport, status;
struct yppasswd yppasswd;
struct passwd *pw;
struct timeval tv;
CLIENT *client;
uid = getuid();
/*
* Get local domain
*/
if ((r = yp_get_default_domain(&domain)) != 0)
errx(1, "can't get local YP domain. Reason: %s",
yperr_string(r));
/*
* Find the host for the passwd map; it should be running
* the daemon.
*/
if ((r = yp_master(domain, "passwd.byname", &master)) != 0) {
warnx("can't find the master YP server. Reason: %s",
yperr_string(r));
/* continuation */
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.\n\t%s\n",
"Can't change YP password.");
/* continuation */
return(-1);
}
/*
* Be sure the port is privileged
*/
if (rpcport >= IPPORT_RESERVED)
errx(1, "yppasswd daemon is on an invalid port.");
/* Bail out if this is a local (non-yp) user, */
/* then get user's login identity */
if (!ypgetpwnam(username) ||
!(pw = getpwnam(username))) {
warnx("YP unknown user %s", username);
/* continuation */
return(-1);
}
if (uid && uid != pw->pw_uid)
errx(1, "you may only change your own password: %s",
strerror(EACCES));
/* prompt for new password */
yppasswd.newpw.pw_passwd = getnewpasswd(pw, &yppasswd.oldpass);
/* tell rpc.yppasswdd */
yppasswd.newpw.pw_name = strdup(pw->pw_name);
if (!yppasswd.newpw.pw_name) {
err(1, "strdup");
/*NOTREACHED*/
}
yppasswd.newpw.pw_uid = pw->pw_uid;
yppasswd.newpw.pw_gid = pw->pw_gid;
yppasswd.newpw.pw_gecos = strdup(pw->pw_gecos);
if (!yppasswd.newpw.pw_gecos) {
err(1, "strdup");
/*NOTREACHED*/
}
yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
if (!yppasswd.newpw.pw_dir) {
err(1, "strdup");
/*NOTREACHED*/
}
yppasswd.newpw.pw_shell = strdup(pw->pw_shell);
if (!yppasswd.newpw.pw_shell) {
err(1, "strdup");
/*NOTREACHED*/
}
client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
if (client == NULL) {
warnx("cannot contact yppasswdd on %s: Reason: %s",
master, yperr_string(YPERR_YPBIND));
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, &yppasswd, xdr_int, &status, tv);
if (r)
errx(1, "rpc to yppasswdd failed.");
else if (status)
printf("Couldn't change YP password.\n");
else
printf("The YP password has been changed on %s, %s\n",
master, "the master YP passwd server.");
return(0);
}
static char *
getnewpasswd(pw, old_pass)
struct passwd *pw;
char **old_pass;
{
int tries;
char *p, *t;
static char buf[_PASSWORD_LEN+1];
char salt[_PASSWORD_LEN+1];
(void)printf("Changing YP password for %s.\n", pw->pw_name);
if (old_pass) {
*old_pass = NULL;
if (pw->pw_passwd[0]) {
if (strcmp(crypt(p = getpass("Old password:"),
pw->pw_passwd), pw->pw_passwd)) {
(void)printf("Sorry.\n");
pw_error(NULL, 0, 1);
}
} else {
p = "";
}
*old_pass = strdup(p);
if (!*old_pass) {
(void)printf("not enough core.\n");
pw_error(NULL, 0, 1);
}
}
for (buf[0] = '\0', tries = 0;;) {
p = getpass("New password:");
if (!*p) {
(void)printf("Password unchanged.\n");
pw_error(NULL, 0, 0);
}
if (strlen(p) <= 5 && ++tries < 2) {
(void)printf("Please enter a longer password.\n");
continue;
}
for (t = p; *t && islower(*t); ++t);
if (!*t && ++tries < 2) {
(void)printf("Please don't use an all-lower case "
"password.\nUnusual capitalization, "
"control characters or digits are "
"suggested.\n");
continue;
}
(void)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, 'y' )) {
(void)printf("Couldn't generate salt.\n");
pw_error(NULL, 0, 0);
}
p = strdup(crypt(buf, salt));
if (!p) {
(void)printf("not enough core.\n");
pw_error(NULL, 0, 0);
}
return (p);
}
static int
ypgetpwnam(nam)
const char *nam;
{
char *val;
int reason, vallen;
val = NULL;
reason = yp_match(domain, "passwd.byname", nam, strlen(nam),
&val, &vallen);
if (reason != 0) {
if (val != NULL)
free(val);
return 0;
}
free(val);
return 1;
}
#endif /* YP */