FreeBSD-5.3/usr.bin/chpass/field.c
/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* Portions of this software were developed for the FreeBSD Project by
* ThinkSec AS and NAI Labs, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* 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.
*/
#if 0
#ifndef lint
static char sccsid[] = "@(#)field.c 8.4 (Berkeley) 4/2/94";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/chpass/field.c,v 1.9 2004/01/18 21:46:39 charnier Exp $");
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <paths.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include "chpass.h"
/* ARGSUSED */
int
p_login(char *p, struct passwd *pw, ENTRY *ep __unused)
{
if (!*p) {
warnx("empty login field");
return (-1);
}
if (*p == '-') {
warnx("login names may not begin with a hyphen");
return (-1);
}
if (!(pw->pw_name = strdup(p))) {
warnx("can't save entry");
return (-1);
}
if (strchr(p, '.'))
warnx("\'.\' is dangerous in a login name");
for (; *p; ++p)
if (isupper(*p)) {
warnx("upper-case letters are dangerous in a login name");
break;
}
return (0);
}
/* ARGSUSED */
int
p_passwd(char *p, struct passwd *pw, ENTRY *ep __unused)
{
if (!(pw->pw_passwd = strdup(p))) {
warnx("can't save password entry");
return (-1);
}
return (0);
}
/* ARGSUSED */
int
p_uid(char *p, struct passwd *pw, ENTRY *ep __unused)
{
uid_t id;
char *np;
if (!*p) {
warnx("empty uid field");
return (-1);
}
if (!isdigit(*p)) {
warnx("illegal uid");
return (-1);
}
errno = 0;
id = strtoul(p, &np, 10);
if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
warnx("illegal uid");
return (-1);
}
pw->pw_uid = id;
return (0);
}
/* ARGSUSED */
int
p_gid(char *p, struct passwd *pw, ENTRY *ep __unused)
{
struct group *gr;
gid_t id;
char *np;
if (!*p) {
warnx("empty gid field");
return (-1);
}
if (!isdigit(*p)) {
if (!(gr = getgrnam(p))) {
warnx("unknown group %s", p);
return (-1);
}
pw->pw_gid = gr->gr_gid;
return (0);
}
errno = 0;
id = strtoul(p, &np, 10);
if (*np || (id == (uid_t)ULONG_MAX && errno == ERANGE)) {
warnx("illegal gid");
return (-1);
}
pw->pw_gid = id;
return (0);
}
/* ARGSUSED */
int
p_class(char *p, struct passwd *pw, ENTRY *ep __unused)
{
if (!(pw->pw_class = strdup(p))) {
warnx("can't save entry");
return (-1);
}
return (0);
}
/* ARGSUSED */
int
p_change(char *p, struct passwd *pw, ENTRY *ep __unused)
{
if (!atot(p, &pw->pw_change))
return (0);
warnx("illegal date for change field");
return (-1);
}
/* ARGSUSED */
int
p_expire(char *p, struct passwd *pw, ENTRY *ep __unused)
{
if (!atot(p, &pw->pw_expire))
return (0);
warnx("illegal date for expire field");
return (-1);
}
/* ARGSUSED */
int
p_gecos(char *p, struct passwd *pw __unused, ENTRY *ep)
{
if (!(ep->save = strdup(p))) {
warnx("can't save entry");
return (-1);
}
return (0);
}
/* ARGSUSED */
int
p_hdir(char *p, struct passwd *pw, ENTRY *ep __unused)
{
if (!*p) {
warnx("empty home directory field");
return (-1);
}
if (!(pw->pw_dir = strdup(p))) {
warnx("can't save entry");
return (-1);
}
return (0);
}
/* ARGSUSED */
int
p_shell(char *p, struct passwd *pw, ENTRY *ep __unused)
{
struct stat sbuf;
if (!*p) {
pw->pw_shell = strdup(_PATH_BSHELL);
return (0);
}
/* only admin can change from or to "restricted" shells */
if (!master_mode && pw->pw_shell && !ok_shell(pw->pw_shell)) {
warnx("%s: current shell non-standard", pw->pw_shell);
return (-1);
}
if (!ok_shell(p)) {
if (!master_mode) {
warnx("%s: non-standard shell", p);
return (-1);
}
pw->pw_shell = strdup(p);
}
else
pw->pw_shell = dup_shell(p);
if (!pw->pw_shell) {
warnx("can't save entry");
return (-1);
}
if (stat(pw->pw_shell, &sbuf) < 0) {
if (errno == ENOENT)
warnx("WARNING: shell '%s' does not exist",
pw->pw_shell);
else
warn("WARNING: can't stat shell '%s'", pw->pw_shell);
return (0);
}
if (!S_ISREG(sbuf.st_mode)) {
warnx("WARNING: shell '%s' is not a regular file",
pw->pw_shell);
return (0);
}
if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
return (0);
}
return (0);
}