xref: /csrg-svn/usr.bin/chpass/field.c (revision 66651)

/*
 * Copyright (c) 1988, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)field.c	8.4 (Berkeley) 04/02/94";
#endif /* not lint */

#include <sys/param.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "chpass.h"
#include "pathnames.h"

/* ARGSUSED */
int
p_login(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	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(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	if (!*p)
		pw->pw_passwd = "";	/* "NOLOGIN"; */
	else if (!(pw->pw_passwd = strdup(p))) {
		warnx("can't save password entry");
		return (1);
	}

	return (0);
}

/* ARGSUSED */
int
p_uid(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	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 == ULONG_MAX && errno == ERANGE)) {
		warnx("illegal uid");
		return (1);
	}
	pw->pw_uid = id;
	return (0);
}

/* ARGSUSED */
int
p_gid(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	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 == ULONG_MAX && errno == ERANGE)) {
		warnx("illegal gid");
		return (1);
	}
	pw->pw_gid = id;
	return (0);
}

/* ARGSUSED */
int
p_class(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	if (!*p)
		pw->pw_class = "";
	else if (!(pw->pw_class = strdup(p))) {
		warnx("can't save entry");
		return (1);
	}

	return (0);
}

/* ARGSUSED */
int
p_change(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	if (!atot(p, &pw->pw_change))
		return (0);
	warnx("illegal date for change field");
	return (1);
}

/* ARGSUSED */
int
p_expire(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	if (!atot(p, &pw->pw_expire))
		return (0);
	warnx("illegal date for expire field");
	return (1);
}

/* ARGSUSED */
int
p_gecos(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	if (!*p)
		ep->save = "";
	else if (!(ep->save = strdup(p))) {
		warnx("can't save entry");
		return (1);
	}
	return (0);
}

/* ARGSUSED */
int
p_hdir(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	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(p, pw, ep)
	char *p;
	struct passwd *pw;
	ENTRY *ep;
{
	char *t, *ok_shell();

	if (!*p) {
		pw->pw_shell = _PATH_BSHELL;
		return (0);
	}
	/* only admin can change from or to "restricted" shells */
	if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) {
		warnx("%s: current shell non-standard", pw->pw_shell);
		return (1);
	}
	if (!(t = ok_shell(p))) {
		if (uid) {
			warnx("%s: non-standard shell", p);
			return (1);
		}
	}
	else
		p = t;
	if (!(pw->pw_shell = strdup(p))) {
		warnx("can't save entry");
		return (1);
	}
	return (0);
}