oamuser/lib/vlogin.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2013 Gary Mills
 *
 * Copyright (c) 1997, by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*LINTLIBRARY*/

#include    <sys/types.h>
#include    <stdio.h>
#include    <ctype.h>
#include    <userdefs.h>
#include    <users.h>
#include    <deflt.h>
#include    <limits.h>

/* Defaults file */
#define DEFAULT_USERADD "/etc/default/useradd"

/*
 * validate string given as login name.
 */
int
valid_login(char *login, struct passwd **pptr, int *warning)
{
    struct passwd *t_pptr;
    char *ptr = login;
    int bad1char, badc, clower, len;
    char c;
    char action;

    len = 0; clower = 0; badc = 0; bad1char = 0;
    *warning = 0;
    if (!login || !*login)
        return (INVALID);

    c = *ptr;
    if (!isalpha(c))
        bad1char++;
    for (; c != NULL; ptr++, c = *ptr) {
        len++;
        if (!isprint(c) || (c == ':') || (c == '\n'))
            return (INVALID);
        if (!isalnum(c) && c != '_' && c != '-' && c != '.')
            badc++;
        if (islower(c))
            clower++;
    }

    action = 'w';
    if (defopen(DEFAULT_USERADD) == 0) {
        char *defptr;

        if ((defptr = defread("EXCEED_TRAD=")) != NULL) {
            char let = tolower(*defptr);

            switch (let) {
            case 'w':   /* warning */
            case 'e':   /* error */
            case 's':   /* silent */
                action = let;
                break;
            }
        }
        (void) defopen((char *)NULL);
    }

    if (len > LOGNAME_MAX)
        return (LONGNAME);

    if (len > LOGNAME_MAX_TRAD) {
        if (action == 'w')
            *warning = *warning | WARN_NAME_TOO_LONG;
        else if (action == 'e')
            return (LONGNAME);
    }

    if (clower == 0)
        *warning = *warning | WARN_NO_LOWERCHAR;
    if (badc != 0)
        *warning = *warning | WARN_BAD_LOGNAME_CHAR;
    if (bad1char != 0)
        *warning = *warning | WARN_BAD_LOGNAME_FIRST;

    if ((t_pptr = getpwnam(login)) != NULL) {
        if (pptr) *pptr = t_pptr;
        return (NOTUNIQUE);
    }
    return (UNIQUE);
}