#!/bin/bash

exit_code=1

function usage
{
  echo "Check for directives in apache configuration (including"
  echo "potentially reachable .htaccess files)"
  echo ""
  echo "Usage: $0 [options]"
  echo ""
  echo "       options: "
  echo "              -s string    system configuration root"
  echo "                           [default: $system_conf_root]"
  echo "              -d string    directives to search"
  echo "                           [default: $check_directives]"
  echo "              -n string    htaccess file name(s)"
  echo "                           [default: $htaccess_names]"
  echo "              -q           do not print where directive(s) was found"
  echo "              -v           as -v plus trace and matched lines"
  echo "              -h           this help"
  echo ""
  echo "Return Value:  0    at least one occurence found in apache config"
  echo "               1    no occurence found"
  echo "               2    wrong arguments"
  echo ""
  echo "Example: "
  echo "   $ $0 -s '/etc/apache2/default-server.conf' -n '.htaccess .htconfig' -d 'Require' -v"
  echo "   Checking /etc/apache2/default-server.conf .. FOUND"
  echo "   Checking /srv/www/htdocs/foo/.htaccess .. FOUND"
  echo "   Checking /etc/apache2/conf.d/gitweb.conf .. FOUND"
  echo "   $"
}


function find_directives_in_file
{
  file=$1

  pattern=$(echo $check_directives | 
    sed 's:\([^ \t]\+\):\\b\1\\b:g' |
    sed 's:\s\+:\\|:g')

  output=$(cat $file |  sed 's:#.*::' | grep -i "$pattern")
  if [ $? -eq 0 ]; then 
    [ $verbosity -ge 1 ] && echo "    Checking $file .. FOUND"
    [ $verbosity -ge 2 ] && echo "    Output: [$output]"
    exit_code=0
  else
    [ $verbosity -ge 2 ] && echo "    Checking $file .. NOT FOUND"
  fi
}

function check_conf_file
{
  conf_file=$1

  [ $verbosity -ge 2 ] && echo "CONFIG FILE: $conf_file"

  find_directives_in_file $conf_file

  # check all directories with AllowOverride not None 
  # for .htaccess files
  directories=$(grep -i '<directory' $conf_file | 
    sed 's:#.*::' | 
    sed 's:.*<directory\s*\([^ \t]*\)\s*>:\1:I' | 
    tr -d '"')

  find_names=$(echo $htaccess_names | 
    sed 's:^\s\+::' | 
    sed 's:\s\+$::' | 
    sed 's:\s\+: -o -name :g' | 
    sed 's:^:-name :')

  for dir in $directories; do
    [ $verbosity -ge 2 ] && echo "  Directory: $dir"

    allow_override=$(grep -i -Pzo "(?s)<directory[\s\"]*$dir.*?</directory>" $conf_file | 
      sed 's:#.*::'| 
      grep AllowOverride)

    [ $verbosity -ge 2 ] && echo "    override: $allow_override"

    shopt -s nocasematch
    if [[ ! $allow_override =~ allowoverride.*none ]]; then
      for htfile in $(find $dir $find_names); do
        find_directives_in_file $htfile
      done
    fi 
    shopt -u nocasematch
  done

  # check all Include or IncludeOptional files recursively
  include_files=$(grep '^\s*Include' $conf_file | 
    sed 's:#.*::' | 
    sed 's:Include[^ ]*\s\+::' | 
    tr '\n' ' ')
  [ $verbosity -ge 2 ] && echo "  Include Files: [$include_files]"

  for ifile in $include_files; do
    if [ -f $ifile ]; then
      check_conf_file $ifile
    fi
  done
}

system_conf_root="/etc/apache2/httpd.conf"
check_directives="allow deny order satisfy"
htaccess_names=".htaccess"
verbosity=1

while getopts ":hs:d:n:vq" opt; do
  case $opt in
    s)
      system_conf_root=$OPTARG
      ;;
    d)
      check_directives=$OPTARG 
      ;;
    n)
      htaccess_names=$OPTARG
      ;;
    q)
      verbosity=0
      ;;
    v)
      verbosity=2
      ;;
    h)
      usage
      exit 0
      ;;
    \?)
      echo "ERROR: Invalid option: -$OPTARG" >&2
      usage
      exit 2
      ;;
    :)
      echo "ERROR: Option -$OPTARG requires an argument." >&2
      usage
      exit 2
      ;;
  esac
done

check_conf_file $system_conf_root

exit $exit_code