1 files changed, 33 insertions, 0 deletions
diff --git a/jdisc-security-filters/src/main/java/com/yahoo/jdisc/http/filter/security/misc/LocalhostFilter.java b/jdisc-security-filters/src/main/java/com/yahoo/jdisc/http/filter/security/misc/LocalhostFilter.java
new file mode 100644
index 00000000000..1623128fac2
--- /dev/null
+++ b/jdisc-security-filters/src/main/java/com/yahoo/jdisc/http/filter/security/misc/LocalhostFilter.java
@@ -0,0 +1,33 @@
+// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.jdisc.http.filter.security.misc;
+
+import com.google.common.net.InetAddresses;
+import com.yahoo.jdisc.Response;
+import com.yahoo.jdisc.http.filter.DiscFilterRequest;
+import com.yahoo.jdisc.http.filter.security.base.JsonSecurityRequestFilterBase;
+
+import java.net.InetAddress;
+import java.util.Optional;
+
+/**
+ * A security filter that only allows self-originating requests.
+ *
+ * @author mpolden
+ * @author bjorncs
+ */
+@SuppressWarnings("unused") // Injected
+public class LocalhostFilter extends JsonSecurityRequestFilterBase {
+
+    @Override
+    protected Optional<ErrorResponse> filter(DiscFilterRequest request) {
+        InetAddress remoteAddr = InetAddresses.forString(request.getRemoteAddr());
+        if (!remoteAddr.isLoopbackAddress() && !request.getRemoteAddr().equals(request.getLocalAddr())) {
+            return Optional.of(new ErrorResponse(
+                    Response.Status.UNAUTHORIZED,
+                    String.format("%s %s denied for %s: Unauthorized host", request.getMethod(),
+                                  request.getUri().getPath(), request.getRemoteAddr())));
+        }
+        return Optional.empty();
+    }
+
+}