Class: Yawast::Scanner::Ssl

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

Class Method Summary collapse

Class Method Details

.check_hsts(head) ⇒ Object 



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# File 'lib/scanner/ssl.rb', line 163

def self.check_hsts(head)
  found = ''

  head.each do |k, v|
    if k.downcase.include? 'strict-transport-security'
      found = "#{k}: #{v}"
    end
  end

  if found == ''
    Yawast::Utilities.puts_warn 'HSTS: Not Enabled'
  else
    Yawast::Utilities.puts_info "HSTS: Enabled (#{found})"
  end

  puts ''
end

.get_ciphers(uri) ⇒ Object 



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# File 'lib/scanner/ssl.rb', line 107

def self.get_ciphers(uri)
  puts 'Supported Ciphers (based on your OpenSSL version):'

  dns = Resolv::DNS.new()
  ip = dns.getaddresses(uri.host)[0]

  #find all versions that don't include '_server' or '_client'
  versions = OpenSSL::SSL::SSLContext::METHODS.find_all { |v| !v.to_s.include?('_client') && !v.to_s.include?('_server')}

  versions.each do |version|
    #ignore SSLv23, as it's an auto-negotiate, which just adds noise
    if version.to_s != "SSLv23"
      ciphers = OpenSSL::SSL::SSLContext.new(version).ciphers
      puts "\tChecking for #{version.to_s} suites (#{ciphers.count} possible suites)"

      ciphers.each do |cipher|
        #try to connect and see what happens
        begin
          socket = TCPSocket.new(ip.to_s, uri.port)
          context = OpenSSL::SSL::SSLContext.new(version)
          context.ciphers = cipher[0]
          ssl = OpenSSL::SSL::SSLSocket.new(socket, context)
          ssl.hostname = uri.host

          ssl.connect

          if cipher[2] < 112 || cipher[0].include?('RC4')
            #less than 112 bits or RC4, flag as a vuln
            Yawast::Utilities.puts_vuln "\t\tVersion: #{ssl.ssl_version.ljust(7)}\tBits: #{cipher[2]}\tCipher: #{cipher[0]}"
          elsif cipher[2] >= 128
            #secure, probably safe
            Yawast::Utilities.puts_info "\t\tVersion: #{ssl.ssl_version.ljust(7)}\tBits: #{cipher[2]}\tCipher: #{cipher[0]}"
          else
            #weak, but not "omg!" weak.
            Yawast::Utilities.puts_warn "\t\tVersion: #{ssl.ssl_version.ljust(7)}\tBits: #{cipher[2]}\tCipher: #{cipher[0]}"
          end

          ssl.sysclose
        rescue OpenSSL::SSL::SSLError => e
          unless e.message.include?('alert handshake failure') ||
              e.message.include?('no ciphers available') ||
              e.message.include?('wrong version number')
            Yawast::Utilities.puts_error "\t\tVersion: #{ssl.ssl_version.ljust(7)}\tBits: #{cipher[2]}\tCipher: #{cipher[0]}\t(Supported But Failed)"
          end
        rescue => e
          Yawast::Utilities.puts_error "\t\tVersion: #{''.ljust(7)}\tBits: #{cipher[2]}\tCipher: #{cipher[0]}\t(#{e.message})"
        ensure
          ssl.sysclose unless ssl == nil
        end
      end
    end
  end

  puts ''
end

.get_session_msg_count(uri) ⇒ Object 



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# File 'lib/scanner/ssl.rb', line 181

def self.get_session_msg_count(uri)
  # this method will send a number of HEAD requests to see
  #  if the connection is eventually killed.
  puts 'TLS Session Request Limit: Checking number of requests accepted...'

  count = 0
  begin
    req = Yawast::Shared::Http.get_http(uri)
    req.use_ssl = uri.scheme == 'https'
    req.keep_alive_timeout = 600
    headers = Yawast::Shared::Http.get_headers

    req.start do |http|
      10000.times do |i|
        http.head(uri.path, headers)

        # hack to detect transparent disconnects
        if http.instance_variable_get(:@ssl_context).session_cache_stats[:cache_hits] != 0
          raise 'TLS Reconnected'
        end

        count += 1

        if i % 20 == 0
          print '.'
        end
      end
    end
  rescue => e
    puts
    Yawast::Utilities.puts_info "TLS Session Request Limit: Connection terminated after #{count} requests (#{e.message})"
    return
  end

  puts
  Yawast::Utilities.puts_warn 'TLS Session Request Limit: Connection not terminated after 10,000 requests'
  Yawast::Utilities.puts_warn 'TLS Session Request Limit: If server supports 3DES, may be affected by SWEET32'
end

.info(uri, check_ciphers, sslsessioncount) ⇒ Object 



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# File 'lib/scanner/ssl.rb', line 8

def self.info(uri, check_ciphers, sslsessioncount)
  begin
    socket = TCPSocket.new(uri.host, uri.port)

    ctx = OpenSSL::SSL::SSLContext.new
    ctx.ciphers = OpenSSL::SSL::SSLContext::DEFAULT_PARAMS[:ciphers]

    ssl = OpenSSL::SSL::SSLSocket.new(socket, ctx)
    ssl.hostname = uri.host
    ssl.connect

    cert = ssl.peer_cert

    unless cert.nil?
      Yawast::Utilities.puts_info 'Found X509 Certificate:'
      Yawast::Utilities.puts_info "\t\tIssued To: #{cert.subject.common_name} / #{cert.subject.organization}"
      Yawast::Utilities.puts_info "\t\tIssuer: #{cert.issuer.common_name} / #{cert.issuer.organization}"
      Yawast::Utilities.puts_info "\t\tVersion: #{cert.version}"
      Yawast::Utilities.puts_info "\t\tSerial: #{cert.serial}"
      Yawast::Utilities.puts_info "\t\tSubject: #{cert.subject}"

      #check to see if cert is expired
      if cert.not_after > Time.now
        Yawast::Utilities.puts_info "\t\tExpires: #{cert.not_after}"
      else
        Yawast::Utilities.puts_vuln "\t\tExpires: #{cert.not_after} (Expired)"
      end

      #check for SHA1 & MD5 certs
      if cert.signature_algorithm.include?('md5') || cert.signature_algorithm.include?('sha1')
        Yawast::Utilities.puts_vuln "\t\tSignature Algorithm: #{cert.signature_algorithm}"
      else
        Yawast::Utilities.puts_info "\t\tSignature Algorithm: #{cert.signature_algorithm}"
      end

      Yawast::Utilities.puts_info "\t\tKey: #{cert.public_key.class.to_s.gsub('OpenSSL::PKey::', '')}-#{get_x509_pub_key_strength(cert)}"
      Yawast::Utilities.puts_info "\t\t\tKey Hash: #{Digest::SHA1.hexdigest(cert.public_key.to_s)}"
      Yawast::Utilities.puts_info "\t\tExtensions:"
      cert.extensions.each { |ext| Yawast::Utilities.puts_info "\t\t\t#{ext}" unless ext.oid == 'subjectAltName' }

      #alt names
      alt_names = cert.extensions.find {|e| e.oid == 'subjectAltName'}
      unless alt_names.nil?
        Yawast::Utilities.puts_info "\t\tAlternate Names:"
        alt_names.value.split(',').each { |name| Yawast::Utilities.puts_info "\t\t\t#{name.strip.delete('DNS:')}" }
      end

      hash = Digest::SHA1.hexdigest(cert.to_der)
      Yawast::Utilities.puts_info "\t\tHash: #{hash}"
      puts "\t\t\thttps://censys.io/certificates?q=#{hash}"
      puts "\t\t\thttps://crt.sh/?q=#{hash}"
      puts ''
    end

    cert_chain = ssl.peer_cert_chain

    if cert_chain.count == 1
      #HACK: This is an ugly way to guess if it's a missing intermediate, or self-signed
      #tIt looks like a change to Ruby's OpenSSL wrapper is needed to actually fix this right.

      if cert.issuer == cert.subject
        Yawast::Utilities.puts_vuln "\t\tCertificate Is Self-Singed"
      else
        Yawast::Utilities.puts_warn "\t\tCertificate Chain Is Incomplete"
      end

      puts ''
    end

    unless cert_chain.nil?
      Yawast::Utilities.puts_info 'Certificate: Chain'
      cert_chain.each do |c|
        Yawast::Utilities.puts_info "\t\tIssued To: #{c.subject.common_name} / #{c.subject.organization}"
        Yawast::Utilities.puts_info "\t\t\tIssuer: #{c.issuer.common_name} / #{c.issuer.organization}"
        Yawast::Utilities.puts_info "\t\t\tExpires: #{c.not_after}"
        Yawast::Utilities.puts_info "\t\t\tKey: #{c.public_key.class.to_s.gsub('OpenSSL::PKey::', '')}-#{get_x509_pub_key_strength(c)}"
        Yawast::Utilities.puts_info "\t\t\tSignature Algorithm: #{c.signature_algorithm}"
        Yawast::Utilities.puts_info "\t\t\tHash: #{Digest::SHA1.hexdigest(c.to_der)}"
        puts ''
      end

      puts ''
    end

    puts "\t\tQualys SSL Labs: https://www.ssllabs.com/ssltest/analyze.html?d=#{uri.host}&hideResults=on"
    puts ''

    if check_ciphers
      get_ciphers(uri)
    end

    ssl.sysclose

    get_session_msg_count(uri) if sslsessioncount
  rescue => e
    Yawast::Utilities.puts_error "SSL: Error Reading X509 Details: #{e.message}"
  end
end