Output a human-readable & colorized view of your EC2 security group rules

ec2-security-group-rules

#!/usr/bin/env ruby

require 'aws-sdk'
require 'colorize'

ec2 = Aws::EC2::Resource.new

ec2.security_groups.sort_by{|s| s.group_name }.each do |sg|
  puts sg.group_name.underline unless sg.ip_permissions.empty?
  sg.ip_permissions.each do |perm|
    ip_ranges = perm.ip_ranges.map{ |r| r.cidr_ip == '0.0.0.0/0' ? r.cidr_ip.red  : r.cidr_ip }.join(", ")
    groups = perm.user_id_group_pairs.map{ |r| r.group_name}.join(", ")
    puts "  #{perm.ip_protocol}/#{perm.from_port} -> instance:#{perm.to_port}".yellow
    puts "    #{groups}" unless groups.empty?
    puts "    #{ip_ranges}" unless ip_ranges.empty?
    puts
  end
end

An example: