Module: Capra

Defined in:
lib/capra.rb,
lib/capra/engine.rb,
lib/capra/version.rb,
lib/capra/private_ips.rb,
lib/capra/snort_rule_parser.rb

Defined Under Namespace

Modules: SnortRuleParser Classes: Engine, Error

Constant Summary collapse

VERSION = 
"1.0.0"
PRIVATE_IPS = 
[
  IPAddr.new('10.0.0.0/8'),
  IPAddr.new('172.16.0.0/12'),
  IPAddr.new('192.168.0.0/16'),
].freeze

Class Method Summary collapse

Class Method Details

.run_cli! ⇒ Object 



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# File 'lib/capra.rb', line 17

def self.run_cli!
  CommandLion::App.run do
    name "Capra"
    version Capra::VERSION
    description "Intrusion Detection System"

    command :init do
      description "create a base Caprafile in the current working directory"

      action do
        if File.exists?("Caprafile")
          puts "error: Caprafile already exists!"
          exit 1
        end
        File.open("Caprafile", 'w') do |file| 
          file.puts '#!/usr/bin/env ruby'
          file.puts
          file.puts "interface '#{Interfacez.default}'"
          file.puts
          file.puts "# your rules go here"
        end
      end
    end

    command :start do
      description "start the engine"

      default "Caprafile"

      action do
        unless File.exists?(argument)
          puts "error: cannot find #{argument} in the current directory"
          puts
          puts "hint: run `capra init` to create a base Caprafile"
          exit 1
        end

        Capra::Engine.new(file: argument)
      end
    end

    # $ capra convert 'alert tcp any any -> any 21 (msg:"ftp")'
    # rule 'TCP' do |packet|
    #   next unless packet.tcp.dport == 21
    #   alert "ftp"
    # end
    command :convert do
      description "Convert Snort rule(s) to Caprafile syntax"

      type :string

      action do
        if File.file?(argument)
          File.foreach(argument) do |line|
            line = line.strip
            next if line.empty?

            Capra::SnortRuleParser.convert(line)
          end
        else
          Capra::SnortRuleParser.convert(argument)
        end
      end
    end
  end
end