Implement AT_BIDDING for EAP-AKA'.

EAP-AKA' defines AT_BIDDING in RFC 5448#4 for use by EAP-AKA to prevent
bidding down attacks. This attribute is defined in
EapAkaAttributeFactory as it will be received in the EAP-AKA protocol
(not during EAP-AKA').

Bug: 142663198
Test: added AtBiddingTest.
Test: atest FrameworksIkeTests
Change-Id: Ib9f2befab1c4338f30b0dfa28905be32a703084e

2 files changed, 103 insertions, 0 deletions

diff --git a/tests/iketests/src/java/com/android/ike/eap/message/simaka/attributes/AtBiddingTest.java b/tests/iketests/src/java/com/android/ike/eap/message/simaka/attributes/AtBiddingTest.java
new file mode 100644
index 00000000..3e6374e8
--- /dev/null
+++ b/tests/iketests/src/java/com/android/ike/eap/message/simaka/attributes/AtBiddingTest.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.ike.eap.message.simaka.attributes;
+
+import static com.android.ike.eap.message.simaka.EapSimAkaAttribute.EAP_AT_BIDDING;
+import static com.android.ike.eap.message.simaka.attributes.EapTestAttributeDefinitions.AT_BIDDING_DOES_NOT_SUPPORT_AKA_PRIME;
+import static com.android.ike.eap.message.simaka.attributes.EapTestAttributeDefinitions.AT_BIDDING_INVALID_LENGTH;
+import static com.android.ike.eap.message.simaka.attributes.EapTestAttributeDefinitions.AT_BIDDING_SUPPORTS_AKA_PRIME;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import com.android.ike.eap.exceptions.simaka.EapSimAkaInvalidAttributeException;
+import com.android.ike.eap.message.simaka.EapAkaAttributeFactory;
+import com.android.ike.eap.message.simaka.EapSimAkaAttribute;
+import com.android.ike.eap.message.simaka.EapSimAkaAttribute.AtBidding;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.nio.ByteBuffer;
+
+public class AtBiddingTest {
+    private EapAkaAttributeFactory mAttributeFactory;
+
+    @Before
+    public void setUp() {
+        mAttributeFactory = EapAkaAttributeFactory.getInstance();
+    }
+
+    @Test
+    public void testDecodeServerSupportsAkaPrime() throws Exception {
+        ByteBuffer input = ByteBuffer.wrap(AT_BIDDING_SUPPORTS_AKA_PRIME);
+        EapSimAkaAttribute result = mAttributeFactory.getAttribute(input);
+
+        assertFalse(input.hasRemaining());
+        AtBidding atBidding = (AtBidding) result;
+        assertEquals(EAP_AT_BIDDING, atBidding.attributeType);
+        assertEquals(AT_BIDDING_SUPPORTS_AKA_PRIME.length, atBidding.lengthInBytes);
+        assertTrue(atBidding.doesServerSupportEapAkaPrime);
+    }
+
+    @Test
+    public void testDecodeDoesNotSupportAkaPrime() throws Exception {
+        ByteBuffer input = ByteBuffer.wrap(AT_BIDDING_DOES_NOT_SUPPORT_AKA_PRIME);
+        EapSimAkaAttribute result = mAttributeFactory.getAttribute(input);
+
+        assertFalse(input.hasRemaining());
+        AtBidding atBidding = (AtBidding) result;
+        assertEquals(EAP_AT_BIDDING, atBidding.attributeType);
+        assertEquals(AT_BIDDING_DOES_NOT_SUPPORT_AKA_PRIME.length, atBidding.lengthInBytes);
+        assertFalse(atBidding.doesServerSupportEapAkaPrime);
+    }
+
+    @Test
+    public void testDecodeInvalidLength() throws Exception {
+        ByteBuffer input = ByteBuffer.wrap(AT_BIDDING_INVALID_LENGTH);
+        try {
+            mAttributeFactory.getAttribute(input);
+            fail("Expected EapSimAkaInvalidAttributeException for invalid length");
+        } catch (EapSimAkaInvalidAttributeException expected) {
+        }
+    }
+
+    @Test
+    public void testEncodeServerSupportsAkaPrime() throws Exception {
+        AtBidding atBidding = new AtBidding(true);
+
+        ByteBuffer result = ByteBuffer.allocate(AT_BIDDING_SUPPORTS_AKA_PRIME.length);
+        atBidding.encode(result);
+        assertArrayEquals(AT_BIDDING_SUPPORTS_AKA_PRIME, result.array());
+    }
+
+    @Test
+    public void testEncodeDoesNotSupportAkaPrime() throws Exception {
+        AtBidding atBidding = new AtBidding(false);
+
+        ByteBuffer result = ByteBuffer.allocate(AT_BIDDING_DOES_NOT_SUPPORT_AKA_PRIME.length);
+        atBidding.encode(result);
+        assertArrayEquals(AT_BIDDING_DOES_NOT_SUPPORT_AKA_PRIME, result.array());
+    }
+}
diff --git a/tests/iketests/src/java/com/android/ike/eap/message/simaka/attributes/EapTestAttributeDefinitions.java b/tests/iketests/src/java/com/android/ike/eap/message/simaka/attributes/EapTestAttributeDefinitions.java
index b9007131..01a7da1d 100644
--- a/tests/iketests/src/java/com/android/ike/eap/message/simaka/attributes/EapTestAttributeDefinitions.java
+++ b/tests/iketests/src/java/com/android/ike/eap/message/simaka/attributes/EapTestAttributeDefinitions.java
@@ -73,6 +73,9 @@ public class EapTestAttributeDefinitions {
     public static final String AUTS = "112233445566778899AABBCCDDEE";
     public static final byte[] AUTS_BYTES = hexStringToByteArray(AUTS);
     public static final byte[] AT_AUTS = hexStringToByteArray("0404" + AUTS);
+    public static final byte[] AT_BIDDING_SUPPORTS_AKA_PRIME = hexStringToByteArray("88018000");
+    public static final byte[] AT_BIDDING_DOES_NOT_SUPPORT_AKA_PRIME =
+            hexStringToByteArray("88010000");
 
     // Network Name = "android.net"
     public static final String NETWORK_NAME_HEX = "616E64726F69642E6E6574";
@@ -113,4 +116,5 @@ public class EapTestAttributeDefinitions {
             hexStringToByteArray("0306008800112233445566778899AABBCCDDEEFF11000000");
     public static final byte[] AT_AUTS_INVALID_LENGTH = hexStringToByteArray("03010000");
     public static final byte[] AT_KDF_INVALID_LENGTH = hexStringToByteArray("18020001");
+    public static final byte[] AT_BIDDING_INVALID_LENGTH = hexStringToByteArray("88020000");
 }