diff --git a/core/src/main/java/hudson/security/LDAPSecurityRealm.java b/core/src/main/java/hudson/security/LDAPSecurityRealm.java
new file mode 100644
index 0000000..1d154fc
--- /dev/null
+++ b/core/src/main/java/hudson/security/LDAPSecurityRealm.java
@@ -0,0 +1,31 @@
+package hudson.security;
+
+import org.acegisecurity.AuthenticationManager;
+import hudson.model.Descriptor;
+
+/**
+ * {@link SecurityRealm} implementation that uses LDAP for authentication.
+ * 
+ * @author Kohsuke Kawaguchi
+ */
+public class LDAPSecurityRealm extends SecurityRealm {
+    public AuthenticationManager createAuthenticationManager() {
+        throw new UnsupportedOperationException();
+    }
+
+    public DescriptorImpl getDescriptor() {
+        return DESCRIPTOR;
+    }
+
+    public static final DescriptorImpl DESCRIPTOR = new DescriptorImpl();
+
+    private static final class DescriptorImpl extends Descriptor<SecurityRealm> {
+        private DescriptorImpl() {
+            super(LDAPSecurityRealm.class);
+        }
+
+        public String getDisplayName() {
+            return "LDAP";
+        }
+    }
+}
diff --git a/core/src/main/resources/hudson/security/LDAPSecurityRealm/config.jelly b/core/src/main/resources/hudson/security/LDAPSecurityRealm/config.jelly
new file mode 100644
index 0000000..2255b50
--- /dev/null
+++ b/core/src/main/resources/hudson/security/LDAPSecurityRealm/config.jelly
@@ -0,0 +1,5 @@
+<j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form">
+	<f:entry title="Server" >
+	  <f:textbox name="ldap.server" value="${instance}" />
+	</f:entry>
+</j:jelly>
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