ww_files_audit.pl

#!/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_w_files.txt";
my $tmpFile = "world_writable_files.tmp";
my $exclude = "/usr/local/etc/world_writable_excludes.txt";
#my $mask = S_IWUSR | S_IWGRP | S_IWOTH;
my (%excludes, %devNums);
my ($regExcld, $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, $line[1]);
    my @stats = stat($_);
    $devNums{$stats[0]} = $_;
  }
}

close MT;

# Build a hash of each mountpoint's device number for future comparison
#foreach (@mounts) {
#  my @stats = stat($_);
#  $devNums{$stats[0]} = $_;
#}

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

  # ...in a basic directory, ...
  return if $File::Find::dir =~ /sys|proc|dev/;

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

  # ...local, ...
  my @dirStats = stat($File::Find::name);
  return if (exists $devNums{$dirStats[0]});

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

  # 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}, $!";

}