/opt/app/bin/.../*
/opt/app/config/.../.../*
/opt/app/log/.../.../.../*
/opt/app/tmp/*

##</code><code>##

#!/usr/bin/perl

use warnings;
use strict;
use Fcntl ':mode';
use File::Find;
no warnings 'File::Find';
no warnings 'uninitialized';

my $dir = "/var/log/tivoli/";
my $mtab = "/etc/mtab";
my $permFile = "world_writable_files.txt";
my $tmpFile = "world_writable_files.tmp";
my $exclude = "/usr/local/etc/world_writable_excludes.txt";
my $mask = S_IWUSR | S_IWGRP | S_IWOTH;
my (%excludes, %devNums);
my $errHeader;

# Compile a list of mountpoints that need to be scanned
my @mounts;

open MT, "<${mtab}" or die "Cannot open ${mtab}, $!";

# We only want the local mountpoints
while (<MT>) {
  if ($_ =~ /ext[34]/) {
    chomp;
    my @line = split;
    push(@mounts, $line[1]);
    my @stats = stat($line[1]);
    $devNums{$stats[0]} = undef;
  }
}

close MT;

# Build a hash from /usr/local/etc/world_writables_excludes.txt
if ((! -e $exclude) || (-z $exclude)) {
  $errHeader = <<HEADER;
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!                                                  !!
!! /usr/local/etc/world_writable_excludes.txt is    !!
!! is missing or empty. This report includes        !!
!! every world-writable file including those which  !!
!! are expected and should be excluded.             !!
!!                                                  !!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


HEADER

} else {
  open XCLD, "<${exclude}" or die "Cannot open ${exclude}, $!\n";
  while (<XCLD>) {
    chomp;
    $excludes{$_} = 1;
  }
}

sub wanted {
  my @dirStats = stat($File::Find::name);

  # Is it excluded from the report...
  return if exists $excludes{$File::Find::name};

  # ...in a special directory, ...
  return if ($File::Find::name =~ /^\bsys\b|\bproc\b|\bdev\b$/);

  # ...a regular file, ...
  return unless -f;

  # ...local, ...
  return unless (exists $devNums{$dirStats[0]});

  # ...and world writable?
  return unless ($dirStats[2] & $mask) == $mask;

  # If so, add the file to the list of world writable files
  print(WWFILE "$File::Find::name\n");

}

# Create the output file path if it doesn't already exist.
mkdir($dir or die "Cannot execute mkdir on ${dir}, $!") unless (-d $dir);

# Create our filehandle for writing our findings
open WWFILE, ">${dir}${tmpFile}" or die "Cannot open ${dir}${tmpFile}, $!";
print(WWFILE "${errHeader}") if ($errHeader);

find(\&wanted, @mounts);

close WWFILE;

# If no world-writable files have been found ${tmpFile} should be zero-size;
# Delete it so Tivoli won't alert
if (-z "${dir}${tmpFile}") {
  unlink "${dir}${tmpFile}";

} else {
  rename("${dir}${tmpFile}","${dir}${permFile}") or die "Cannot rename file ${dir}${tmpFile}, $!";

}

##</code><code>##

sub wanted {
  my @dirStats = stat($File::Find::name);

  # Is it excluded from the report...
  if (exists $excludes{$File::Find::name}) {
    $File::Find::prune=1 if (-d _);
    return;
  }

  # ...in a basic directory, ...
  if ($File::Find::name =~ /^\bsys\b|\bproc\b|\bdev\b$/) {
    $File::Find::prune=1 if (-d _);
    return;
  }

  # ... not a regular file, ...
  return unless -f _;

  # ...local, ...
  return if (exists $devNums{$dirStats[0]});

  # ...and world writable?
  my $protection = $dirStats[2];
  my $writemask = (S_IWUSR | S_IWGRP | S_IWOTH);
  return unless $writemask == $protection & $writemask;

  # If so, add the file to the list of world writable files
  print(WWFILE "$File::Find::name\n");

}