HADOOP-14242. Make KMS Tomcat SSL property sslEnabledProtocols and clientAuth configurable. Contributed by John Zhuge.

hadoop-common-project/hadoop-kms/src/main/conf/kms-env.sh

@@ -66,6 +66,19 @@
 #
 # export KMS_MAX_HTTP_HEADER_SIZE=65536
 
+# Set to 'true' if you want the SSL stack to require a valid certificate chain
+# from the client before accepting a connection. Set to 'want' if you want the
+# SSL stack to request a client Certificate, but not fail if one isn't
+# presented. A 'false' value (which is the default) will not require a
+# certificate chain unless the client requests a resource protected by a
+# security constraint that uses CLIENT-CERT authentication.
+#
+# export KMS_SSL_CLIENT_AUTH=false
+
+# The comma separated list of SSL protocols to support
+#
+# export KMS_SSL_ENABLED_PROTOCOLS="TLSv1,TLSv1.1,TLSv1.2,SSLv2Hello"
+
 # The comma separated list of encryption ciphers for SSL
 #
 # export KMS_SSL_CIPHERS=

hadoop-common-project/hadoop-kms/src/main/libexec/kms-config.sh

@@ -177,6 +177,20 @@ else
   print "Using   KMS_MAX_HTTP_HEADER_SIZE:     ${KMS_MAX_HTTP_HEADER_SIZE}"
 fi
 
+if [ "${KMS_SSL_CLIENT_AUTH}" = "" ]; then
+  export KMS_SSL_CLIENT_AUTH="false"
+  print "Setting KMS_SSL_CLIENT_AUTH:     ${KMS_SSL_CLIENT_AUTH}"
+else
+  print "Using   KMS_SSL_CLIENT_AUTH:     ${KMS_SSL_CLIENT_AUTH}"
+fi
+
+if [ "${KMS_SSL_ENABLED_PROTOCOLS}" = "" ]; then
+  export KMS_SSL_ENABLED_PROTOCOLS="TLSv1,TLSv1.1,TLSv1.2,SSLv2Hello"
+  print "Setting KMS_SSL_ENABLED_PROTOCOLS:     ${KMS_SSL_ENABLED_PROTOCOLS}"
+else
+  print "Using   KMS_SSL_ENABLED_PROTOCOLS:     ${KMS_SSL_ENABLED_PROTOCOLS}"
+fi
+
 if [ "${KMS_SSL_CIPHERS}" = "" ]; then
   export KMS_SSL_CIPHERS="TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384"
   KMS_SSL_CIPHERS+=",TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"

hadoop-common-project/hadoop-kms/src/main/sbin/kms.sh

@@ -87,6 +87,9 @@ if [[ "${1}" = "start" || "${1}" = "run" ]]; then
     "${KMS_ACCEPTOR_THREAD_COUNT}"
   catalina_set_property "kms.max.http.header.size" \
     "${KMS_MAX_HTTP_HEADER_SIZE}"
+  catalina_set_property "kms.ssl.client.auth" "${KMS_SSL_CLIENT_AUTH}"
+  catalina_set_property "kms.ssl.enabled.protocols" \
+    "${KMS_SSL_ENABLED_PROTOCOLS}"
   catalina_set_property "kms.ssl.ciphers" "${KMS_SSL_CIPHERS}"
   catalina_set_property "kms.ssl.keystore.file" "${KMS_SSL_KEYSTORE_FILE}"
 

hadoop-common-project/hadoop-kms/src/main/tomcat/ssl-server.xml

@@ -73,7 +73,8 @@
                acceptCount="${kms.accept.count}"
                acceptorThreadCount="${kms.acceptor.thread.count}"
                maxHttpHeaderSize="${kms.max.http.header.size}"
-               clientAuth="false" sslEnabledProtocols="TLSv1,TLSv1.1,TLSv1.2,SSLv2Hello"
+               clientAuth="${kms.ssl.client.auth}"
+               sslEnabledProtocols="${kms.ssl.enabled.protocols}"
                ciphers="${kms.ssl.ciphers}"
                truststorePass="${kms.ssl.truststore.pass}"
                keystoreFile="${kms.ssl.keystore.file}"

hadoop-common-project/hadoop-kms/src/site/markdown/index.md.vm

@@ -301,11 +301,20 @@ The answer to "What is your first and last name?" (i.e. "CN") must be the hostna
 
 NOTE: You need to restart the KMS for the configuration changes to take effect.
 
+
+Set environment variable `KMS_SSL_CLIENT_AUTH` to change client
+authentication. The default is `false`. See `clientAuth` in
+[Tomcat 6.0 SSL Support](https://tomcat.apache.org/tomcat-6.0-doc/config/http.html#SSL_Support).
+
+Set environment variable `KMS_SSL_ENABLED_PROTOCOLS` to specify a list of
+enabled SSL protocols. The default list includes `TLSv1`, `TLSv1.1`,
+`TLSv1.2`, and `SSLv2Hello`. See `sslEnabledProtocols` in
+[Tomcat 6.0 SSL Support](https://tomcat.apache.org/tomcat-6.0-doc/config/http.html#SSL_Support).
+
 In order to support some old SSL clients, the default encryption ciphers
 include a few relatively weaker ciphers. Set environment variable
-`KMS_SSL_CIPHERS` or property `kms.ssl.ciphers` to override. The value is a
+`KMS_SSL_CIPHERS` to override. The value is a comma separated list of ciphers
-comma separated list of ciphers documented in this
+documented in [Tomcat Wiki](https://wiki.apache.org/tomcat/Security/Ciphers).
-[Tomcat Wiki](https://wiki.apache.org/tomcat/Security/Ciphers).
 
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