cmd/cron/permit.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <pwd.h>
#include <auth_attr.h>
#include <auth_list.h>

#include "cron.h"

struct stat globstat;
#define exists(file)    (stat(file, &globstat) == 0)
#define ROOT    "root"

int per_errno;  /* status info from getuser */
static int within(char *, char *);


char *
getuser(uid)
uid_t uid;
{
    struct passwd *nptr;

    if ((nptr = getpwuid(uid)) == NULL) {
        per_errno = 1;
        return (NULL);
    }
    if ((strcmp(nptr->pw_shell, SHELL) != 0) &&
        (strcmp(nptr->pw_shell, "") != 0)) {
        per_errno = 2;
        /*
         * return NULL if you want crontab and at to abort
         * when the users login shell is not /usr/bin/sh otherwise
         * return pw_name
         */
        return (nptr->pw_name);
    }
    return (nptr->pw_name);
}

int
allowed(user, allow, deny)
char *user, *allow, *deny;
{
    if (exists(allow)) {
        if (within(user, allow)) {
            return (1);
        } else {
            return (0);
        }
    } else if (exists(deny)) {
        if (within(user, deny)) {
            return (0);
        } else {
            return (1);
        }
    } else if (chkauthattr(CRONUSER_AUTH, user)) {
        return (1);
    } else {
        return (0);
    }
}

static int
within(username, filename)
char *username, *filename;
{
    char line[UNAMESIZE];
    FILE *cap;
    int i;

    if ((cap = fopen(filename, "r")) == NULL)
        return (0);
    while (fgets(line, UNAMESIZE, cap) != NULL) {
        for (i = 0; line[i] != '\0'; i++) {
            if (isspace(line[i])) {
                line[i] = '\0';
                break; }
        }
        if (strcmp(line, username) == 0) {
            fclose(cap);
            return (1);
        }
    }
    fclose(cap);
    return (0);
}

int
cron_admin(const char *name)
{
    return (chkauthattr(CRONADMIN_AUTH, name));
}