ipsec-tools/racoon/safefile.c

   1 /*      $NetBSD: safefile.c,v 1.4 2006/09/09 16:22:10 manu Exp $        */
   2
   3 /*      $KAME: safefile.c,v 1.5 2001/03/05 19:54:06 thorpej Exp $       */
   4
   5 /*
   6  * Copyright (C) 2000 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "config.h"
  35
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <sys/socket.h>
  39 #include <netinet/in.h>
  40 #include <unistd.h>
  41
  42 #include "plog.h"
  43 #include "debug.h"
  44 #include "misc.h"
  45 #include "safefile.h"
  46
  47 int
  48 safefile(path, secret)
  49         const char *path;
  50         int secret;
  51 {
  52         struct stat s;
  53         uid_t me;
  54
  55         /* no setuid */
  56         if (getuid() != geteuid()) {
  57                 plog(ASL_LEVEL_ERR,
  58                     "setuid'ed execution not allowed\n");
  59                 return -1;
  60         }
  61
  62         if (stat(path, &s) != 0)
  63                 return -1;
  64
  65         /* the file must be owned by the running uid */
  66         me = getuid();
  67         if (s.st_uid != me) {
  68                 plog(ASL_LEVEL_ERR,
  69                     "%s has invalid owner uid\n", path);
  70                 return -1;
  71         }
  72
  73         switch (s.st_mode & S_IFMT) {
  74         case S_IFREG:
  75                 break;
  76         default:
  77                 plog(ASL_LEVEL_ERR,
  78                     "%s is an invalid file type 0x%x\n", path,
  79                     (s.st_mode & S_IFMT));
  80                 return -1;
  81         }
  82
  83         /* secret file should not be read by others */
  84         if (secret) {
  85                 if ((s.st_mode & S_IRWXG) != 0 || (s.st_mode & S_IRWXO) != 0) {
  86                         plog(ASL_LEVEL_ERR,
  87                             "%s has weak file permission\n", path);
  88                         return -1;
  89                 }
  90         }
  91
  92         return 0;
  93 }