[AWARE] Add UID checking to WifiAwareNetworkSpecifier

Wifi Aware networks are per app - i.e. a requestor gets
a dedicated network. Change verifies that the only the
original requestor matches the created network (using UID).

Bug: 36053921
Test: Integration (sl4a) tests
Change-Id: I4ff3994731dd7ccb88e2bea333d1e6905b136f02

tests/net/java/com/android/server/ConnectivityServiceTest.java

@@ -1992,6 +1992,40 @@ public class ConnectivityServiceTest extends AndroidTestCase {
         }
     }
 
+    @SmallTest
+    public void testNetworkSpecifierUidSpoofSecurityException() {
+        class UidAwareNetworkSpecifier extends NetworkSpecifier implements Parcelable {
+            @Override
+            public boolean satisfiedBy(NetworkSpecifier other) {
+                return true;
+            }
+
+            @Override
+            public void assertValidFromUid(int requestorUid) {
+                throw new SecurityException("failure");
+            }
+
+            @Override
+            public int describeContents() { return 0; }
+            @Override
+            public void writeToParcel(Parcel dest, int flags) {}
+        }
+
+        mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
+        mWiFiNetworkAgent.connect(false);
+
+        UidAwareNetworkSpecifier networkSpecifier = new UidAwareNetworkSpecifier();
+        NetworkRequest networkRequest = newWifiRequestBuilder().setNetworkSpecifier(
+                networkSpecifier).build();
+        TestNetworkCallback networkCallback = new TestNetworkCallback();
+        try {
+            mCm.requestNetwork(networkRequest, networkCallback);
+            fail("Network request with spoofed UID did not throw a SecurityException");
+        } catch (SecurityException e) {
+            // expected
+        }
+    }
+
     @SmallTest
     public void testRegisterDefaultNetworkCallback() throws Exception {
         final TestNetworkCallback defaultNetworkCallback = new TestNetworkCallback();