usr/src/cmd/acct/accton.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  23 /*        All Rights Reserved   */
  24
  25 /*
  26  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29 #pragma ident   "%Z%%M% %I%     %E% SMI"
  30
  31 /*
  32  *      accton - calls syscall with super-user privileges
  33  */
  34
  35 #include <stdio.h>
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include "acctdef.h"
  39 #include <errno.h>
  40 #include <sys/stat.h>
  41 #include <pwd.h>
  42 #include <fcntl.h>
  43 #include <stdlib.h>
  44
  45 uid_t   admuid;
  46 struct  passwd *pwd;
  47
  48 void ckfile(char *);
  49
  50 int
  51 main(int argc, char **argv)
  52 {
  53         uid_t   uid;
  54
  55         uid = getuid();
  56         if ((pwd = getpwnam("adm")) == NULL) {
  57                 perror("cannot determine adm's uid"), exit(1);
  58         }
  59         admuid = pwd->pw_uid;
  60         if (uid == ROOT || uid == admuid) {
  61                 if (setuid(ROOT) == ERR) {
  62                         perror("cannot setuid (check command mode and owner)");
  63                         exit(1);
  64                 }
  65                 if (argv[1])
  66                         ckfile(argv[1]);
  67                 if (acct(argc > 1 ? argv[1] : 0) < 0) {
  68                         perror(argv[1]), exit(1);
  69                 }
  70                 exit(0);
  71
  72         }
  73         fprintf(stderr, "%s: permission denied\n", argv[0]);
  74         exit(1);
  75 }
  76
  77 void
  78 ckfile(char *admfile)
  79 {
  80         struct stat             stbuf;
  81         struct stat     *s = &stbuf;
  82         int fd;
  83
  84         if ((fd = open(admfile, O_RDONLY|O_CREAT, 0644)) == ERR) {
  85                 perror("creat"), exit(1);
  86         }
  87
  88         if (fstat(fd, s) == ERR) {
  89                 perror("fstat");
  90                 exit(1);
  91         }
  92
  93         if (s->st_uid != admuid || s->st_gid != (gid_t)admuid)
  94                 if (fchown(fd, admuid, (gid_t)admuid) == ERR) {
  95                         perror("cannot change owner"), exit(1);
  96                 }
  97
  98         /* was if(s->st_mode & 0777 != 0664) */
  99         if ((s->st_mode & S_IAMB) != S_IRUSR|S_IWUSR|S_IRGRP|S_IWUSR|S_IROTH)
 100             if (fchmod(fd, S_IRUSR|S_IWUSR|S_IRGRP|S_IWUSR|S_IROTH) == ERR) {
 101                         perror("cannot chmod"), exit(1);
 102             }
 103
 104         (void) close(fd);
 105 }