GUACAMOLE-990: Add Docker image support for guacamole-auth-ban.

guacamole-docker/bin/build-guacamole.sh

@@ -198,3 +198,13 @@ if [ -f extensions/guacamole-auth-json/target/guacamole-auth-json*.jar ]; then
     mkdir -p "$DESTINATION/json"
     cp extensions/guacamole-auth-json/target/guacamole-auth-json*.jar "$DESTINATION/json"
 fi
+
+#
+# Copy automatic brute-force banning auth extension if it was built
+#
+
+if [ -f extensions/guacamole-auth-ban/target/guacamole-auth-ban*.jar ]; then
+    mkdir -p "$DESTINATION/ban"
+    cp extensions/guacamole-auth-ban/target/guacamole-auth-ban*.jar "$DESTINATION/ban"
+fi
+

guacamole-docker/bin/start.sh

@@ -1160,6 +1160,18 @@ if [ -n "$API_SESSION_TIMEOUT" ]; then
     associate_apisessiontimeout
 fi
 
+# Apply any overrides for default address ban behavior
+set_optional_property "ban-address-duration" "$BAN_ADDRESS_DURATION"
+set_optional_property "ban-max-addresses" "$BAN_MAX_ADDRESSES"
+set_optional_property "ban-max-invalid-attempts" "$BAN_MAX_INVALID_ATTEMPTS"
+
+# Ensure guacamole-auth-ban always loads before other extensions unless
+# explicitly overridden via naming or EXTENSION_PRIORITY (allowing other
+# extensions to attempt authentication before guacamole-auth-ban has a chance
+# to enforce any bans could allow credentials to continue to be guessed even
+# after the address has been blocked via timing attacks)
+ln -s /opt/guacamole/ban/guacamole-auth-*.jar "$GUACAMOLE_EXT/_guacamole-auth-ban.jar"
+
 # Set logback level if specified
 if [ -n "$LOGBACK_LEVEL" ]; then
     unzip -o -j /opt/guacamole/guacamole.war WEB-INF/classes/logback.xml -d $GUACAMOLE_HOME