#!/usr/bin/perl
# Emacs settings: -*- tab-width: 4 -*-
#
# File: installtool
# 
# Abstract: Copy "ddnswriteconfig" to Application Support and make it setuid root.
# 
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# Change History (most recent first):
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# $Log: installtool,v $
# Revision 1.3  2006/09/05 20:00:13  cheshire
# Moved Emacs settings to second line of file
#
# Revision 1.2  2006/08/14 23:15:14  cheshire
# Added "tab-width" emacs header line
#
# Revision 1.1  2005/06/04 04:51:48  cheshire
# <rdar://problem/4138070> ddnswriteconfig (Bonjour PreferencePane) vulnerability
# Added separate "installtool" script instead of making ddnswriteconfig self-install
#
# Create the Bonjour subdirectory.
# Copy ARGV[0] to $dest and set owner and suid permissions.
#
# This script will be run as root by the AEWP trampoline.
#

use File::Temp qw/ :mktemp /;

$dest_dir = "/Library/Application Support/Bonjour";
$dest = $dest_dir . "/ddnswriteconfig";

$template = ".XXXXXX";

# Perl seems to think this code is running setuid root, so it applies its security checks.
# See <http://www.monster-submit.com/resources/docs/pod/perlsec.html>.
# In fact this is NOT a setuid script. It is a normal unprivileged user-level script --
# but it is run as root when properly authorized by a user with an admin password,
# via the AuthorizationExecuteWithPrivileges() call.
# We therefore have to do this trick pattern match to 'untaint' the source file specified in $ARGV[0].
if ($ARGV[0] =~ /^(.+)$/) { $src = $1; }

# Also clear $ENV{PATH} so we don't get "Insecure $ENV{PATH}" fatal errors
$ENV{PATH} = "";

if (! -d $dest_dir) {
   $dest_tmp_dir = mkdtemp ($dest_dir . $template);
   (chown 0, 80, $dest_tmp_dir) or cleanup_dir();
   (chmod 0755, $dest_tmp_dir) or cleanup_dir();
   (rename $dest_tmp_dir, $dest_dir) or cleanup_dir();
}

$dest_tmp = mktemp ($dest . $template);

if ($src ne '') {
   system ('/bin/cp', '-f', $src, $dest_tmp) and cleanup();
   (chown 0, 80, $dest_tmp) or cleanup();
   (chmod 04555, $dest_tmp) or cleanup();
   (rename $dest_tmp, $dest) or cleanup();
}
exit (0);

sub cleanup {
   unlink $dest_tmp;
   exit (1);
}

sub cleanup_dir {
   unlink $dest_tmp_dir;
   exit (1);
}