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NetBSD/usr.bin/passwd/yp_passwd.c

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/* $NetBSD: yp_passwd.c,v 1.14 1997/05/21 02:09:51 lukem 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. 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
#if 0
static char sccsid[] = "from: @(#)local_passwd.c 8.3 (Berkeley) 4/2/94";
#else
static char rcsid[] = "$NetBSD: yp_passwd.c,v 1.14 1997/05/21 02:09:51 lukem Exp $";
#endif
#endif /* not lint */
#ifdef YP
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <time.h>
#include <pwd.h>
#include <errno.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 char *__progname; /* from crt0.o */
extern int yflag, yppwd;
static char *getnewpasswd();
static struct passwd *ypgetpwnam();
static uid_t uid;
char *domain;
static
pw_error(name, err, eval)
char *name;
int err, eval;
{
int sverrno;
if (err) {
sverrno = errno;
(void)fprintf(stderr, "%s: ", __progname);
if (name)
(void)fprintf(stderr, "%s: ", name);
(void)fprintf(stderr, "%s\n", strerror(sverrno));
}
errx(eval, "YP passwd database unchanged");
}
int
yp_passwd(username)
char *username;
{
char *master;
char *pp;
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))
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)
errx(1, "can't find the master YP server. Reason: %s",
yperr_string(r));
/*
* Ask the portmapper for the port of the daemon.
*/
if ((rpcport = getrpcport(master, YPPASSWDPROG,
YPPASSWDPROC_UPDATE, IPPROTO_UDP)) == 0) {
/*
* Master server isn't running rpc.yppasswdd. Check to see
* if there's a local passwd entry, and if there is, use
* it iff:
* - we were not invoked as "yppasswd"
* - we were not passed "-y", and defaulted to YP
*/
if (yppwd == 0 && yflag == 0)
if (getpwnam(username) != NULL)
exit(local_passwd(username));
errx(1, "master YP server not running yppasswd daemon.\n\t%s\n",
"Can't change password.");
}
/*
* Be sure the port is priviledged
*/
if (rpcport >= IPPORT_RESERVED)
errx(1, "yppasswd daemon is on an invalid port.");
/* Get user's login identity */
if (!(pw = ypgetpwnam(username)))
errx(1, "unknown user %s", username);
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 = pw->pw_name;
yppasswd.newpw.pw_uid = pw->pw_uid;
yppasswd.newpw.pw_gid = pw->pw_gid;
yppasswd.newpw.pw_gecos = pw->pw_gecos;
yppasswd.newpw.pw_dir = pw->pw_dir;
yppasswd.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));
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.");
exit(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[9], *crypt(), *getpass();
(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)) {
errno = EACCES;
pw_error(NULL, 1, 1);
}
} else {
p = "";
}
*old_pass = strdup(p);
}
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)strncpy(buf, p, sizeof(buf) - 1);
if (!strcmp(buf, getpass("Retype new password:")))
break;
(void)printf("Mismatch; try again, EOF to quit.\n");
}
/* grab a random printable character that isn't a colon */
(void)srandom((int)time((time_t *)NULL));
#ifdef NEWSALT
salt[0] = _PASSWORD_EFMT1;
to64(&salt[1], (long)(29 * 25), 4);
to64(&salt[5], random(), 4);
#else
to64(&salt[0], random(), 2);
#endif
return(strdup(crypt(buf, salt)));
}
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)
{
char *p = line;
int c;
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);
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 struct passwd *
ypgetpwnam(nam)
char *nam;
{
static struct passwd pwent;
static char line[1024];
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 (NULL);
}
val[vallen] = '\0';
(void)strncpy(line, val, sizeof(line) - 1);
free(val);
return(interpret(&pwent, line));
}
#endif /* YP */
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