Class: Yawast::Scanner::Generic

Inherits:
Object
  • Object
show all
Defined in:
lib/scanner/generic.rb

Class Method Summary collapse

Class Method Details

.head_info(head, uri) ⇒ Object 



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# File 'lib/scanner/generic.rb', line 10

def self.head_info(head, uri)
  begin
    server = ''
    powered_by = ''
    cookies = []
    pingback = ''
    frame_options = ''
    content_options = ''
    csp = ''
    backend_server = ''
    runtime = ''
    xss_protection = ''
    via = ''
    hpkp = ''
    acao = ''
    referrer_policy = ''
    feature_policy = ''

    Yawast::Utilities.puts_info 'HEAD:'
    head.each do |k, v|
      Yawast::Utilities.puts_info "\t\t#{k}: #{v}"
      Yawast::Shared::Output.log_value 'http', 'head', k, v

      server = v if k.casecmp('server').zero?
      powered_by = v if k.casecmp('x-powered-by').zero?
      pingback = v if k.casecmp('x-pingback').zero?
      frame_options = v if k.casecmp('x-frame-options').zero?
      content_options = v if k.casecmp('x-content-type-options').zero?
      csp = v if k.casecmp('content-security-policy').zero?
      backend_server = v if k.casecmp('x-backend-server').zero?
      runtime = v if k.casecmp('x-runtime').zero?
      xss_protection = v if k.casecmp('x-xss-protection').zero?
      via = v if k.casecmp('via').zero?
      hpkp = v if k.casecmp('public-key-pins').zero?
      acao = v if k.casecmp('access-control-allow-origin').zero?
      referrer_policy = v if k.casecmp('referrer-policy').zero?
      feature_policy = v if k.casecmp('feature-policy').zero?

      if k.casecmp('set-cookie').zero?
        # this chunk of magic manages to properly split cookies, when multiple are sent together
        v.gsub(/(,([^;,]*=)|,$)/) { "\r\n#{$2}" }.split(/\r\n/).each do |c|
          cookies.push(c)

          Yawast::Shared::Output.log_append_value 'http', 'head', 'cookies', c
        end
      end
    end
    puts ''

    if server != ''
      Yawast::Scanner::Plugins::Servers::Apache.check_banner(server)
      Yawast::Scanner::Plugins::Applications::Framework::PHP.check_banner(server)
      Yawast::Scanner::Plugins::Servers::Iis.check_banner(server)
      Yawast::Scanner::Plugins::Servers::Nginx.check_banner(server)
      Yawast::Scanner::Plugins::Servers::Python.check_banner(server)

      if server == 'cloudflare'
        Yawast::Utilities.puts_info 'NOTE: Server appears to be Cloudflare; WAF may be in place.'
        puts
      end

      Yawast::Shared::Output.log_value 'server', server
    end

    if powered_by != ''
      Yawast::Utilities.puts_warn "X-Powered-By Header Present: #{powered_by}"
      Yawast::Scanner::Plugins::Applications::Framework::PHP.check_powered_by(powered_by)
    end

    Yawast::Utilities.puts_warn 'X-XSS-Protection Disabled Header Present' if xss_protection == '0'

    Yawast::Utilities.puts_info "X-Pingback Header Present: #{pingback}" unless pingback == ''

    unless runtime == ''
      if runtime.is_number?
        Yawast::Utilities.puts_warn 'X-Runtime Header Present; likely indicates a RoR application'
      else
        Yawast::Utilities.puts_warn "X-Runtime Header Present: #{runtime}"
      end
    end

    Yawast::Utilities.puts_warn "X-Backend-Server Header Present: #{backend_server}" unless backend_server == ''

    Yawast::Utilities.puts_warn "Via Header Present: #{via}" unless via == ''

    if frame_options == ''
      Yawast::Utilities.puts_warn 'X-Frame-Options Header Not Present'
    else
      if frame_options.casecmp('allow').zero?
        Yawast::Utilities.puts_vuln "X-Frame-Options Header: #{frame_options}"
      else
        Yawast::Utilities.puts_info "X-Frame-Options Header: #{frame_options}"
      end
    end

    if content_options == ''
      Yawast::Utilities.puts_warn 'X-Content-Type-Options Header Not Present'
    else
      Yawast::Utilities.puts_info "X-Content-Type-Options Header: #{content_options}"
    end

    Yawast::Utilities.puts_warn 'Content-Security-Policy Header Not Present' if csp == ''

    Yawast::Utilities.puts_warn 'Public-Key-Pins Header Not Present' if hpkp == ''

    Yawast::Utilities.puts_warn 'Access-Control-Allow-Origin: Unrestricted' if acao == '*'

    Yawast::Utilities.puts_warn 'Referrer-Policy Header Not Present' if referrer_policy == ''

    Yawast::Utilities.puts_warn 'Feature-Policy Header Not Present' if feature_policy == ''

    puts ''

    unless cookies.empty?
      Yawast::Utilities.puts_info 'Cookies:'

      cookies.each do |val|
        Yawast::Utilities.puts_info "\t\t#{val.strip}"

        elements = val.strip.split(';')

        # check for secure cookies
        if elements.include?(' Secure') || elements.include?(' secure')
          if uri.scheme != 'https'
            Yawast::Utilities.puts_warn "\t\t\tCookie with Secure flag sent over non-HTTPS connection"
          end
        else
          Yawast::Utilities.puts_warn "\t\t\tCookie missing Secure flag"
        end

        # check for HttpOnly cookies
        unless elements.include?(' HttpOnly') || elements.include?(' httponly')
          Yawast::Utilities.puts_warn "\t\t\tCookie missing HttpOnly flag"
        end

        # check for SameSite cookies
        unless elements.include?(' SameSite') || elements.include?(' samesite')
          Yawast::Utilities.puts_warn "\t\t\tCookie missing SameSite flag"
        end
      end

      puts ''
    end

    puts ''
  rescue => e # rubocop:disable Style/RescueStandardError
    Yawast::Utilities.puts_error "Error getting head information: #{e.message}"
    raise
  end
end