NetBSD/usr.bin/passwd/yp_passwd.c

468 lines
11 KiB
C

/* $NetBSD: yp_passwd.c,v 1.37 2012/03/25 05:55:07 dholland 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 1.37 2012/03/25 05:55:07 dholland 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 <limits.h>
#include <util.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 uid_t uid;
static char *domain;
__dead static void
pwerror(const char *name, int show_err, int eval)
{
if (show_err)
warn("%s", name);
errx(eval, "NIS passwd database unchanged");
}
static char *
getnewpasswd(struct passwd *pw, char **old_pass)
{
int tries;
const char *p, *t;
char *result;
static char buf[_PASSWORD_LEN + 1];
char salt[_PASSWORD_LEN + 1];
char option[LINE_MAX], *key, *opt;
(void)printf("Changing NIS 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");
pwerror(NULL, 0, 1);
}
} else {
p = "";
}
*old_pass = strdup(p);
if (!*old_pass) {
(void)printf("not enough core.\n");
pwerror(NULL, 0, 1);
}
}
for (buf[0] = '\0', tries = 0;;) {
p = getpass("New password:");
if (!*p) {
(void)printf("Password unchanged.\n");
pwerror(NULL, 0, 0);
}
if (strlen(p) <= 5 && ++tries < 2) {
(void)printf("Please enter a longer password.\n");
continue;
}
for (t = p; *t && islower((unsigned char)*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");
}
pw_getpwconf(option, sizeof(option), pw, "ypcipher");
opt = option;
key = strsep(&opt, ",");
if (pw_gensalt(salt, _PASSWORD_LEN, key, opt) == -1) {
warn("Couldn't generate salt");
pwerror(NULL, 0, 0);
}
result = strdup(crypt(buf, salt));
if (!result) {
(void)printf("not enough core.\n");
pwerror(NULL, 0, 0);
}
return result;
}
static void
makeypp(struct yppasswd *ypp, struct passwd *pw)
{
/* prompt for new password */
ypp->newpw.pw_passwd = getnewpasswd(pw, &ypp->oldpass);
/* tell rpc.yppasswdd */
ypp->newpw.pw_name = estrdup(pw->pw_name);
ypp->newpw.pw_uid = pw->pw_uid;
ypp->newpw.pw_gid = pw->pw_gid;
ypp->newpw.pw_gecos = estrdup(pw->pw_gecos);
ypp->newpw.pw_dir = estrdup(pw->pw_dir);
ypp->newpw.pw_shell = estrdup(pw->pw_shell);
}
static int
ypgetpwnam(const char *nam, struct passwd *pwd)
{
char *val;
int reason, vallen, namlen = (int)strlen(nam);
int flags;
int ok;
flags = ok = 0;
val = NULL;
reason = yp_match(domain, "master.passwd.byname", nam, namlen,
&val, &vallen);
if (reason == YPERR_MAP) {
reason = yp_match(domain, "passwd.byname", nam, namlen,
&val, &vallen);
flags = _PASSWORD_OLDFMT;
}
if (reason != 0)
goto out;
if (pw_scan(val, pwd, &flags) == 0)
goto out;
ok = 1;
val = NULL; /* Don't free the memory, it is still in use */
out:
if (val)
free(val);
return ok;
}
#ifdef USE_PAM
void
pwyp_usage(const char *prefix)
{
(void)fprintf(stderr, "%s %s [-d nis | -y] [user]\n",
prefix, getprogname());
}
void
pwyp_argv0_usage(const char *prefix)
{
(void)fprintf(stderr, "%s %s [user]\n",
prefix, getprogname());
}
void
pwyp_process(const char *username, int argc, char **argv)
{
char *master;
int ch, r, rpcport, status;
enum clnt_stat yr;
struct yppasswd ypp;
struct passwd pwb, pwb2, *pw;
char pwbuf[1024];
struct timeval tv;
CLIENT *client;
while ((ch = getopt(argc, argv, "y")) != -1) {
switch (ch) {
case 'y':
/*
* Abosrb the -y that may have gotten us here.
*/
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
switch (argc) {
case 0:
/* username already provided */
break;
case 1:
username = argv[0];
break;
default:
usage();
/*NOTREACHED*/
}
if (_yp_check(NULL) == 0) {
/* can't use YP. */
errx(EXIT_FAILURE, "NIS not in use.");
}
uid = getuid();
/*
* Get local domain
*/
if ((r = yp_get_default_domain(&domain)) != 0)
errx(EXIT_FAILURE, "Can't get local NIS domain (%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)
errx(EXIT_FAILURE, "Can't find the master NIS server (%s)",
yperr_string(r));
/*
* Ask the portmapper for the port of the daemon.
*/
if ((rpcport = getrpcport(master, YPPASSWDPROG,
YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0)
errx(EXIT_FAILURE, "Master NIS server not running yppasswd "
"daemon");
/*
* Be sure the port is privileged
*/
if (rpcport >= IPPORT_RESERVED)
errx(EXIT_FAILURE, "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, &pwb) ||
getpwnam_r(username, &pwb2, pwbuf, sizeof(pwbuf), &pw) ||
pw == NULL)
errx(EXIT_FAILURE, "NIS unknown user %s", username);
if (uid && uid != pwb.pw_uid) {
errno = EACCES;
err(EXIT_FAILURE, "You may only change your own password");
}
makeypp(&ypp, &pwb);
client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
if (client == NULL)
errx(EXIT_FAILURE, "Cannot contact yppasswdd on %s (%s)",
master, yperr_string(YPERR_YPBIND));
client->cl_auth = authunix_create_default();
tv.tv_sec = 2;
tv.tv_usec = 0;
yr = clnt_call(client, YPPASSWDPROC_UPDATE,
xdr_yppasswd, &ypp, xdr_int, &status, tv);
if (yr != RPC_SUCCESS)
errx(EXIT_FAILURE, "RPC to yppasswdd failed (%s)",
clnt_sperrno(yr));
else if (status)
printf("Couldn't change NIS password.\n");
else
printf("The NIS password has been changed on %s, %s\n",
master, "the master NIS passwd server.");
}
#else /* ! USE_PAM */
static int yflag;
int
yp_init(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(EXIT_FAILURE, "NIS not in use");
return -1;
}
return 0;
}
int
yp_arg(char ch, const char *arg)
{
switch (ch) {
case 'y':
yflag = 1;
break;
default:
return 0;
}
return 1;
}
int
yp_arg_end(void)
{
if (yflag)
return PW_USE_FORCE;
return PW_USE;
}
void
yp_end(void)
{
/* NOOP */
}
int
yp_chpw(const char *username)
{
char *master;
int r, rpcport, status;
enum clnt_stat yr;
struct yppasswd ypp;
struct passwd *pw, pwb;
char pwbuf[1024];
struct timeval tv;
CLIENT *client;
uid = getuid();
/*
* Get local domain
*/
if ((r = yp_get_default_domain(&domain)) != 0)
errx(EXIT_FAILURE, "can't get local NIS 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 NIS 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 NIS server not running yppasswd daemon");
/* continuation */
return -1;
}
/*
* Be sure the port is privileged
*/
if (rpcport >= IPPORT_RESERVED)
errx(EXIT_FAILURE, "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 = &pwb) ||
getpwnam_r(username, &pwb, pwbuf, sizeof(pwbuf), &pw) ||
pw == NULL) {
warnx("NIS unknown user %s", username);
/* continuation */
return -1;
}
if (uid && uid != pw->pw_uid) {
errno = EACCES;
err(EXIT_FAILURE, "You may only change your own password");
}
makeypp(&ypp, pw);
client = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
if (client == NULL) {
warnx("Cannot contact yppasswdd on %s (%s)",
master, yperr_string(YPERR_YPBIND));
return YPERR_YPBIND;
}
client->cl_auth = authunix_create_default();
tv.tv_sec = 2;
tv.tv_usec = 0;
yr = clnt_call(client, YPPASSWDPROC_UPDATE,
xdr_yppasswd, &ypp, xdr_int, &status, tv);
if (yr != RPC_SUCCESS)
errx(EXIT_FAILURE, "RPC to yppasswdd failed (%s)",
clnt_sperrno(yr));
else if (status)
printf("Couldn't change NIS password.\n");
else
printf("The NIS password has been changed on %s, %s\n",
master, "the master NIS passwd server.");
return 0;
}
#endif /* USE_PAM */
#endif /* YP */