Upgrade SSL settings

See:
- Mozilla's recommendations: https://wiki.mozilla.org/Security/Server_Side_TLS#Apache
- SSLLabs results: https://www.ssllabs.com/ssltest/analyze.html?d=dehnerts.com

diff --git a/mods-available/ssl.conf b/mods-available/ssl.conf
index 79f5a12869e7a1a4488a5dbcd92455be37428c08..bc4f93e3294c6f3df6bb9fde42f4aa25b9608b1e 100644 (file)
--- a/mods-available/ssl.conf
+++ b/mods-available/ssl.conf
@@ -52,7 +52,11 @@ SSLMutex  file:${APACHE_RUN_DIR}/ssl_mutex
 #   List the ciphers that the client is permitted to negotiate.
 #   See the mod_ssl documentation for a complete list.
 #   enable only secure ciphers:
-SSLCipherSuite HIGH:MEDIUM:!ADH:!MD5
+#SSLCipherSuite HIGH:MEDIUM:!ADH:!MD5
+
+# Intermediate compatibility from https://wiki.mozilla.org/Security/Server_Side_TLS#Intermediate_compatibility_.28default.29:
+SSLCipherSuite ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
+SSLHonorCipherOrder     on
 #   Use this instead if you want to allow cipher upgrades via SGC facility.
 #   In this case you also have to use something like 
 #        SSLRequire %{SSL_CIPHER_USEKEYSIZE} >= 128
@@ -60,7 +64,10 @@ SSLCipherSuite HIGH:MEDIUM:!ADH:!MD5
 #SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL
 
 # enable only secure protocols: SSLv3 and TLSv1, but not SSLv2
-SSLProtocol all -SSLv2
+SSLProtocol all -SSLv2 -SSLv3
+
+# Compression is rarely supported and vulnerable, see CRIME attack
+SSLCompression Off
 
 # Allow insecure renegotiation with clients which do not yet support the
 # secure renegotiation protocol. Default: Off