Class: Yawast::Scanner::Ssl

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

Class Method Summary collapse

Class Method Details

.check_cipher_strength(cipher, ssl) ⇒ Object 



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# File 'lib/scanner/ssl.rb', line 158

def self.check_cipher_strength(cipher, ssl)
  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
end

.get_cert_chain_info(cert_chain, cert) ⇒ Object 



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# File 'lib/scanner/ssl.rb', line 89

def self.get_cert_chain_info(cert_chain, cert)
  if cert_chain.count == 1
    # HACK: This is an ugly way to guess if it's a missing intermediate, or self-signed
    # It 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-Signed"
    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
end

.get_cert_info(cert) ⇒ Object 



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# File 'lib/scanner/ssl.rb', line 47

def self.get_cert_info(cert)
  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' || ext.oid == 'ct_precert_scts' }

  # ct_precert_scts
  Yawast::Scanner::Plugins::SSL::SSL.print_precert cert

  # 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

  Yawast::Scanner::Plugins::SSL::SSL.print_cert_hash cert

  puts
end

.get_ciphers(uri) ⇒ Object 



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# File 'lib/scanner/ssl.rb', line 119

def self.get_ciphers(uri)
  puts 'Supported Ciphers:'

  dns = Resolv::DNS.new

  ip = if IPAddress.valid? uri.host
         IPAddress.parse uri.host
       else
         dns.getaddresses(uri.host)[0]
       end

  protocols = %w[ssl2 ssl3 tls1.0 tls1.1 tls1.2]

  protocols.each do |protocol|
    ciphers = case protocol
                when 'ssl2'
                  SSLShake::SSLv2::CIPHERS
                when 'ssl3'
                  SSLShake::TLS::SSL3_CIPHERS
                else
                  SSLShake::TLS::TLS_CIPHERS
              end

    puts "\tChecking for #{protocol} suites (#{ciphers.count} possible suites)"

    ciphers.each_key do |cipher|
      begin
        res = SSLShake.hello(ip.to_s, {port: uri.port, protocol: protocol, ciphers: cipher, servername: uri.host})

        Yawast::Utilities.puts_info "\t\tCipher: #{res['cipher_suite']}" if res['error'].nil?
      rescue => e # rubocop:disable Style/RescueStandardError
        Yawast::Utilities.puts_error "SSL: Error Reading Cipher Details: #{e.message}"
      end
    end
  end

  puts ''
end

.info(uri, check_ciphers, tdes_session_count) ⇒ Object 



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# File 'lib/scanner/ssl.rb', line 11

def self.info(uri, check_ciphers, tdes_session_count)
  begin
    puts
    puts 'DEPRECATED: The Internal SSL Scanner (--internalssl) is deprecated and will not be updated.'
    puts 'DEPRECATED: Use a tool such as testssl.sh or sslyze instead.'
    puts

    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

    get_cert_info cert unless cert.nil?

    cert_chain = ssl.peer_cert_chain
    get_cert_chain_info cert_chain, cert

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

    get_ciphers(uri) if check_ciphers

    ssl.sysclose

    Yawast::Scanner::Plugins::SSL::Sweet32.get_tdes_session_msg_count(uri) if tdes_session_count
  rescue => e # rubocop:disable Style/RescueStandardError
    Yawast::Utilities.puts_error "SSL: Error Reading X509 Details: #{e.message}"
  end
end