racoon.tproj/safefile.c

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