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@ -0,0 +1,453 @@ |
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require 'socket' |
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require 'openssl' |
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module CryptCheck |
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module Tls |
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module Engine |
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TCP_TIMEOUT = 10 |
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SSL_TIMEOUT = 2*TCP_TIMEOUT |
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class TLSException < ::StandardError |
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end |
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class TLSNotAvailableException < TLSException |
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def to_s |
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'TLS seems not supported on this server' |
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end |
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end |
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class MethodNotAvailable < TLSException |
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end |
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class CipherNotAvailable < TLSException |
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end |
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class InappropriateFallback < TLSException |
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end |
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class Timeout < ::StandardError |
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end |
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class TLSTimeout < Timeout |
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end |
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class ConnectionError < ::StandardError |
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end |
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attr_reader :certs, :keys, :dh, :supported_methods, :supported_ciphers, :supported_curves, :curves_preference |
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def initialize(hostname, family, ip, port) |
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@hostname, @family, @ip, @port = hostname, family, ip, port |
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@dh = [] |
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@name = "#@ip:#@port" |
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@name += " [#@hostname]" if @hostname |
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Logger.info { @name.colorize :blue } |
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fetch_supported_methods |
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fetch_supported_ciphers |
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fetch_dh |
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fetch_ciphers_preferences |
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fetch_ecdsa_certs |
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fetch_supported_curves |
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fetch_curves_preference |
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check_fallback_scsv |
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verify_certs |
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end |
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def supported_method?(method) |
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ssl_client method |
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Logger.info { " Method #{method}" } |
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true |
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rescue TLSException |
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Logger.debug { " Method #{method} : not supported" } |
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false |
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end |
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def fetch_supported_methods |
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Logger.info { '' } |
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Logger.info { 'Supported methods' } |
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@supported_methods = Method.select { |m| supported_method? m } |
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end |
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def supported_cipher?(method, cipher) |
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connection = ssl_client method, cipher |
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Logger.info { " Cipher #{cipher}" } |
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dh = connection.tmp_key |
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if dh |
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Logger.info { " PFS : #{dh}" } |
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end |
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connection |
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rescue TLSException |
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Logger.debug { " Cipher #{cipher} : not supported" } |
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nil |
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end |
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def fetch_supported_ciphers |
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Logger.info { '' } |
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Logger.info { 'Supported ciphers' } |
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@supported_ciphers = @supported_methods.collect do |method| |
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ciphers = Cipher[method].collect do |cipher| |
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connection = supported_cipher? method, cipher |
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next nil unless connection |
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[cipher, connection] |
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end.compact.to_h |
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[method, ciphers] |
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end.to_h |
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end |
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def fetch_ciphers_preferences |
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Logger.info { '' } |
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Logger.info { 'Cipher suite preferences' } |
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@preferences = @supported_ciphers.collect do |method, ciphers| |
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ciphers = ciphers.keys |
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preferences = if ciphers.size < 2 |
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Logger.info { " #{method} : " + 'not applicable'.colorize(:unknown) } |
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nil |
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else |
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a, b, _ = ciphers |
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ab = ssl_client(method, [a, b]).cipher.first |
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ba = ssl_client(method, [b, a]).cipher.first |
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if ab != ba |
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Logger.info { " #{method} : " + 'client preference'.colorize(:warning) } |
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:client |
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else |
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sort = -> (a, b) do |
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connection = ssl_client method, [a, b] |
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cipher = connection.cipher.first |
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cipher == a.name ? -1 : 1 |
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end |
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preferences = ciphers.sort &sort |
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Logger.info { " #{method} : " + preferences.collect { |c| c.to_s :short }.join(', ') } |
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preferences |
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end |
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end |
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[method, preferences] |
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end.to_h |
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end |
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def fetch_dh |
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@dh = @supported_ciphers.collect do |_, ciphers| |
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ciphers.values.collect(&:tmp_key).select { |d| d.is_a? OpenSSL::PKey::DH } |
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end.flatten |
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end |
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def fetch_ecdsa_certs |
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@ecdsa_certs = {} |
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@supported_ciphers.each do |method, ciphers| |
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ecdsa = ciphers.keys.detect &:ecdsa? |
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next unless ecdsa |
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@ecdsa_certs = Curve.collect do |curve| |
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begin |
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connection = ssl_client method, ecdsa, curves: curve |
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[curve, connection] |
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rescue TLSException |
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nil |
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end |
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end.compact.to_h |
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break |
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end |
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end |
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def fetch_supported_curves |
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Logger.info { '' } |
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Logger.info { 'Supported elliptic curves' } |
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@supported_curves = [] |
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ecdsa_curve = @ecdsa_certs.keys.first |
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if ecdsa_curve |
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# If we have an ECDSA cipher, we need at least the certificate curve to do handshake, |
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# but with lowest priority to check for ECHDE and not just ECDSA |
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@supported_ciphers.each do |method, ciphers| |
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ecdsa = ciphers.keys.detect &:ecdsa? |
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next unless ecdsa |
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@supported_curves = Curve.select do |curve| |
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next true if curve == ecdsa_curve # ECDSA curve is always supported |
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begin |
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connection = ssl_client method, ecdsa, curves: [curve, ecdsa_curve] |
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# Not too fast !!! |
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# Handshake will **always** succeed, because ECDSA |
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# curve is always supported. |
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# So, we need to test for the real curve! |
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# Treaky case : if server preference is enforced, |
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# ECDSA curve can be prefered over ECDHE one and so |
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# really supported curve can be detected as not supported :( |
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dh = connection.tmp_key |
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negociated_curve = dh.curve |
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supported = ecdsa_curve != negociated_curve |
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if supported |
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Logger.info { " ECC curve #{curve.name}" } |
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else |
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Logger.debug { " ECC curve #{curve.name} : not supported" } |
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end |
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supported |
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rescue TLSException |
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false |
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end |
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end |
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break |
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end |
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else |
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# If we have no ECDSA ciphers, ECC supported are only ECDH ones |
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# So peak an ECDH cipher and test all curves |
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@supported_ciphers.each do |method, ciphers| |
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ecdh = ciphers.keys.detect { |c| c.ecdh? or c.ecdhe? } |
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next unless ecdh |
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@supported_curves = Curve.select do |curve| |
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begin |
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ssl_client method, ecdh, curves: curve |
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Logger.info { " ECC curve #{curve.name}" } |
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true |
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rescue TLSException |
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Logger.debug { " ECC curve #{curve.name} : not supported" } |
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false |
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end |
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end |
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break |
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end |
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end |
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end |
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def fetch_curves_preference |
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@curves_preference = if @supported_curves.size < 2 |
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Logger.info { 'Curves preference : ' + 'not applicable'.colorize(:unknown) } |
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nil |
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else |
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method, cipher = @supported_ciphers.collect do |method, ciphers| |
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cipher = ciphers.keys.detect { |c| c.ecdh? or c.ecdhe? } |
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[method, cipher] |
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end.detect { |n| !n.nil? } |
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a, b, _ = @supported_curves |
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ab, ba = [a, b], [b, a] |
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if cipher.ecdsa? |
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# In case of ECDSA, add the cert key at the end |
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# Or no negociation possible |
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ecdsa_curve = @ecdsa_certs.keys.first |
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ab << ecdsa_curve |
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ba << ecdsa_curve |
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end |
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ab = ssl_client(method, cipher, curves: ab).tmp_key.curve |
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ba = ssl_client(method, cipher, curves: ba).tmp_key.curve |
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if ab != ba |
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Logger.info { 'Curves preference : ' + 'client preference'.colorize(:warning) } |
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:client |
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else |
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sort = -> (a, b) do |
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curves = [a, b] |
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if cipher.ecdsa? |
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# In case of ECDSA, add the cert key at the end |
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# Or no negociation possible |
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curves << ecdsa_curve |
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end |
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connection = ssl_client method, cipher, curves: curves |
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curve = connection.tmp_key.curve |
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a == curve ? -1 : 1 |
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end |
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preferences = @supported_curves.sort &sort |
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Logger.info { 'Curves preference : ' + preferences.collect { |c| c.name }.join(', ') } |
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preferences |
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end |
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end |
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end |
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def check_fallback_scsv |
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Logger.info { '' } |
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@fallback_scsv = false |
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if @supported_methods.size > 1 |
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# We will try to connect to the not better supported method |
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method = @supported_methods[1] |
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begin |
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ssl_client method, fallback: true |
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rescue InappropriateFallback |
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@fallback_scsv = true |
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end |
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else |
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@fallback_scsv = nil |
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end |
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text, color = case @fallback_scsv |
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when true |
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['supported', :good] |
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when false |
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['not supported', :error] |
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when nil |
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['not applicable', :unknown] |
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end |
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Logger.info { 'Fallback SCSV : ' + text.colorize(color) } |
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end |
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Method.each do |method| |
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class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1 |
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def #{method.to_sym.downcase}? |
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@supported_methods.detect { |m| m == :#{method.to_sym} } |
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end |
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RUBY_EVAL |
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end |
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Cipher::TYPES.each do |type, _| |
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class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1 |
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def #{type}? |
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uniq_supported_ciphers.any? { |c| c.#{type}? } |
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end |
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RUBY_EVAL |
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end |
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private |
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def connect(&block) |
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socket = ::Socket.new @family, sock_type |
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sockaddr = ::Socket.sockaddr_in @port, @ip |
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#Logger.trace { "Connecting to #{@ip}:#{@port}" } |
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begin |
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status = socket.connect_nonblock sockaddr |
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#Logger.trace { "Connecting to #{@ip}:#{@port} status : #{status}" } |
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raise ConnectionError, status unless status == 0 |
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#Logger.trace { "Connected to #{@ip}:#{@port}" } |
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block_given? ? block.call(socket) : nil |
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rescue ::IO::WaitReadable |
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#Logger.trace { "Waiting for read to #{@ip}:#{@port}" } |
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raise Timeout, "Timeout when connect to #{@ip}:#{@port} (max #{TCP_TIMEOUT.humanize})" unless IO.select [socket], nil, nil, TCP_TIMEOUT |
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retry |
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rescue ::IO::WaitWritable |
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#Logger.trace { "Waiting for write to #{@ip}:#{@port}" } |
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raise Timeout, "Timeout when connect to #{@ip}:#{@port} (max #{TCP_TIMEOUT.humanize})" unless IO.select nil, [socket], nil, TCP_TIMEOUT |
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retry |
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ensure |
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socket.close |
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end |
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end |
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def ssl_connect(socket, context, method, &block) |
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ssl_socket = ::OpenSSL::SSL::SSLSocket.new socket, context |
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ssl_socket.hostname = @hostname if @hostname and method != :SSLv2 |
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#Logger.trace { "SSL connecting to #{name}" } |
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begin |
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ssl_socket.connect_nonblock |
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#Logger.trace { "SSL connected to #{name}" } |
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return block_given? ? block.call(ssl_socket) : nil |
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rescue ::OpenSSL::SSL::SSLErrorWaitReadable |
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#Logger.trace { "Waiting for SSL read to #{name}" } |
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raise TLSTimeout, "Timeout when TLS connect to #{@ip}:#{@port} (max #{SSL_TIMEOUT.humanize})" unless IO.select [ssl_socket], nil, nil, SSL_TIMEOUT |
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retry |
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rescue ::OpenSSL::SSL::SSLErrorWaitWritable |
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#Logger.trace { "Waiting for SSL write to #{name}" } |
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raise TLSTimeout, "Timeout when TLS connect to #{@ip}:#{@port} (max #{SSL_TIMEOUT.humanize})" unless IO.select nil, [ssl_socket], nil, SSL_TIMEOUT |
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retry |
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rescue ::OpenSSL::SSL::SSLError => e |
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case e.message |
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when /state=SSLv2 read server hello A$/, |
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/state=SSLv3 read server hello A$/, |
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/state=SSLv3 read server hello A: wrong version number$/, |
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/state=SSLv3 read server hello A: tlsv1 alert protocol version$/, |
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/state=SSLv3 read server key exchange A: sslv3 alert handshake failure$/ |
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raise MethodNotAvailable, e |
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when /state=SSLv2 read server hello A: peer error no cipher$/, |
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/state=error: no ciphers available$/, |
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/state=SSLv3 read server hello A: sslv3 alert handshake failure$/, |
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/state=error: missing export tmp dh key$/, |
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/state=error: wrong curve$/ |
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raise CipherNotAvailable, e |
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when /state=SSLv3 read server hello A: tlsv1 alert inappropriate fallback$/ |
|
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|
|
raise InappropriateFallback, e |
|
|
|
|
end |
|
|
|
|
raise |
|
|
|
|
rescue ::SystemCallError => e |
|
|
|
|
case e.message |
|
|
|
|
when /^Connection reset by peer - SSL_connect$/ |
|
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|
|
raise TLSNotAvailableException, e |
|
|
|
|
end |
|
|
|
|
raise |
|
|
|
|
ensure |
|
|
|
|
ssl_socket.close |
|
|
|
|
end |
|
|
|
|
end |
|
|
|
|
|
|
|
|
|
def ssl_client(method, ciphers = nil, curves: nil, fallback: false, &block) |
|
|
|
|
ssl_context = ::OpenSSL::SSL::SSLContext.new method.to_sym |
|
|
|
|
ssl_context.enable_fallback_scsv if fallback |
|
|
|
|
|
|
|
|
|
if ciphers |
|
|
|
|
ciphers = [ciphers] unless ciphers.is_a? Enumerable |
|
|
|
|
ciphers = ciphers.collect(&:name).join ':' |
|
|
|
|
else |
|
|
|
|
ciphers = Cipher::ALL |
|
|
|
|
end |
|
|
|
|
ssl_context.ciphers = ciphers |
|
|
|
|
|
|
|
|
|
if curves |
|
|
|
|
curves = [curves] unless curves.is_a? Enumerable |
|
|
|
|
# OpenSSL fails if the same curve is selected multiple times |
|
|
|
|
# So because Array#uniq preserves order, remove the less prefered ones |
|
|
|
|
curves = curves.collect(&:name).uniq.join ':' |
|
|
|
|
ssl_context.ecdh_curves = curves |
|
|
|
|
end |
|
|
|
|
|
|
|
|
|
Logger.trace { "Try method=#{method} / ciphers=#{ciphers} / curves=#{curves} / scsv=#{fallback}" } |
|
|
|
|
connect do |socket| |
|
|
|
|
ssl_connect socket, ssl_context, method do |ssl_socket| |
|
|
|
|
return block_given? ? block.call(ssl_socket) : ssl_socket |
|
|
|
|
end |
|
|
|
|
end |
|
|
|
|
end |
|
|
|
|
|
|
|
|
|
def verify_certs |
|
|
|
|
Logger.info { '' } |
|
|
|
|
Logger.info { 'Certificates' } |
|
|
|
|
|
|
|
|
|
# Let's begin the fun |
|
|
|
|
# First, collect "standard" connections |
|
|
|
|
# { method => { cipher => connection, ... }, ... } |
|
|
|
|
certs = @supported_ciphers.values.collect(&:values).flatten 1 |
|
|
|
|
# Then, collect "ecdsa" connections |
|
|
|
|
# { curve => connection, ... } |
|
|
|
|
certs += @ecdsa_certs.values |
|
|
|
|
# For anonymous cipher, there is no certificate at all |
|
|
|
|
certs = certs.reject { |c| c.peer_cert.nil? } |
|
|
|
|
# Then, fetch cert |
|
|
|
|
certs = certs.collect { |c| Cert.new c } |
|
|
|
|
# Then, filter cert to keep uniq fingerprint |
|
|
|
|
@certs = certs.uniq { |c| c.fingerprint } |
|
|
|
|
|
|
|
|
|
@certs.each do |cert| |
|
|
|
|
key = cert.key |
|
|
|
|
identity = cert.valid?(@hostname || @ip) |
|
|
|
|
trust = cert.trusted? |
|
|
|
|
Logger.info { " Certificate #{cert.subject} [#{cert.serial}] issued by #{cert.issuer}" } |
|
|
|
|
Logger.info { ' Key : ' + Tls.key_to_s(key) } |
|
|
|
|
if identity |
|
|
|
|
Logger.info { ' Identity : ' + 'valid'.colorize(:good) } |
|
|
|
|
else |
|
|
|
|
Logger.info { ' Identity : ' + 'invalid'.colorize(:error) } |
|
|
|
|
end |
|
|
|
|
if trust == :trusted |
|
|
|
|
Logger.info { ' Trust : ' + 'trusted'.colorize(:good) } |
|
|
|
|
else |
|
|
|
|
Logger.info { ' Trust : ' + 'untrusted'.colorize(:error) + ' - ' + trust } |
|
|
|
|
end |
|
|
|
|
end |
|
|
|
|
@keys = @certs.collect &:key |
|
|
|
|
end |
|
|
|
|
|
|
|
|
|
def uniq_dh |
|
|
|
|
dh, find = [], [] |
|
|
|
|
@dh.each do |k| |
|
|
|
|
f = [k.type, k.size] |
|
|
|
|
unless find.include? f |
|
|
|
|
dh << k |
|
|
|
|
find << f |
|
|
|
|
end |
|
|
|
|
end |
|
|
|
|
@dh = dh |
|
|
|
|
end |
|
|
|
|
|
|
|
|
|
private |
|
|
|
|
def uniq_supported_ciphers |
|
|
|
|
@supported_ciphers.values.collect(&:keys).flatten.uniq |
|
|
|
|
end |
|
|
|
|
end |
|
|
|
|
end |
|
|
|
|
end |
