mDNSMacOSX/PreferencePane/installtool

   1 #!/usr/bin/perl
   2 # Emacs settings: -*- tab-width: 4 -*-
   3 #
   4 # File: installtool
   5 #
   6 # Abstract: Copy "ddnswriteconfig" to Application Support and make it setuid root.
   7 #
   8 # Copyright: (c) Copyright 2005 Apple Computer, Inc. All rights reserved.
   9 #
  10 # Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
  11 # ("Apple") in consideration of your agreement to the following terms, and your
  12 # use, installation, modification or redistribution of this Apple software
  13 # constitutes acceptance of these terms.  If you do not agree with these terms,
  14 # please do not use, install, modify or redistribute this Apple software.
  15 #
  16 # In consideration of your agreement to abide by the following terms, and subject
  17 # to these terms, Apple grants you a personal, non-exclusive license, under Apple's
  18 # copyrights in this original Apple software (the "Apple Software"), to use,
  19 # reproduce, modify and redistribute the Apple Software, with or without
  20 # modifications, in source and/or binary forms; provided that if you redistribute
  21 # the Apple Software in its entirety and without modifications, you must retain
  22 # this notice and the following text and disclaimers in all such redistributions of
  23 # the Apple Software.  Neither the name, trademarks, service marks or logos of
  24 # Apple Computer, Inc. may be used to endorse or promote products derived from the
  25 # Apple Software without specific prior written permission from Apple.  Except as
  26 # expressly stated in this notice, no other rights or licenses, express or implied,
  27 # are granted by Apple herein, including but not limited to any patent rights that
  28 # may be infringed by your derivative works or by other works in which the Apple
  29 # Software may be incorporated.
  30 #
  31 # The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
  32 # WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
  33 # WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  34 # PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
  35 # COMBINATION WITH YOUR PRODUCTS.
  36 #
  37 # IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
  38 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  39 # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40 # ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
  41 # OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
  42 # (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
  43 # ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  44 #
  45 # Create the Bonjour subdirectory.
  46 # Copy ARGV[0] to $dest and set owner and suid permissions.
  47 #
  48 # This script will be run as root by the AEWP trampoline.
  49 #
  50
  51 use File::Temp qw/ :mktemp /;
  52
  53 $dest_dir = "/Library/Application Support/Bonjour";
  54 $dest = $dest_dir . "/ddnswriteconfig";
  55
  56 $template = ".XXXXXX";
  57
  58 # Perl seems to think this code is running setuid root, so it applies its security checks.
  59 # See <http://www.monster-submit.com/resources/docs/pod/perlsec.html>.
  60 # In fact this is NOT a setuid script. It is a normal unprivileged user-level script --
  61 # but it is run as root when properly authorized by a user with an admin password,
  62 # via the AuthorizationExecuteWithPrivileges() call.
  63 # We therefore have to do this trick pattern match to 'untaint' the source file specified in $ARGV[0].
  64 if ($ARGV[0] =~ /^(.+)$/) { $src = $1; }
  65
  66 # Also clear $ENV{PATH} so we don't get "Insecure $ENV{PATH}" fatal errors
  67 $ENV{PATH} = "";
  68
  69 if (! -d $dest_dir) {
  70    $dest_tmp_dir = mkdtemp ($dest_dir . $template);
  71    (chown 0, 80, $dest_tmp_dir) or cleanup_dir();
  72    (chmod 0755, $dest_tmp_dir) or cleanup_dir();
  73    (rename $dest_tmp_dir, $dest_dir) or cleanup_dir();
  74 }
  75
  76 $dest_tmp = mktemp ($dest . $template);
  77
  78 if ($src ne '') {
  79    system ('/bin/cp', '-f', $src, $dest_tmp) and cleanup();
  80    (chown 0, 80, $dest_tmp) or cleanup();
  81    (chmod 04555, $dest_tmp) or cleanup();
  82    (rename $dest_tmp, $dest) or cleanup();
  83 }
  84 exit (0);
  85
  86 sub cleanup {
  87    unlink $dest_tmp;
  88    exit (1);
  89 }
  90
  91 sub cleanup_dir {
  92    unlink $dest_tmp_dir;
  93    exit (1);
  94 }