8194960: Add a test for trust manager and cacerts keystore sanity

Reviewed-by: weijun

test/jdk/javax/net/ssl/sanity/CacertsExplorer.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2018 Google Inc. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.security.KeyStore;
+import java.security.cert.X509Certificate;
+import java.util.Arrays;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.TrustManagerFactory;
+import javax.net.ssl.X509TrustManager;
+
+/*
+ * @test
+ * @bug 8194960
+ * @summary Sanity check trust manager defaults/cacerts.
+ */
+
+/**
+ * Explores the set of root certificates.
+ * Also useful as a standalone program.
+ *
+ * Prior to JEP 319, stock openjdk fails this because no root
+ * certificates were checked into the repo.
+ */
+public class CacertsExplorer {
+    public static void main(String[] args) throws Throwable {
+        String defaultAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
+        if (!defaultAlgorithm.equals("PKIX")) {
+            throw new AssertionError(
+                "Expected default algorithm PKIX, got " + defaultAlgorithm);
+        }
+
+        TrustManagerFactory trustManagerFactory =
+            TrustManagerFactory.getInstance(defaultAlgorithm);
+        trustManagerFactory.init((KeyStore) null);
+        TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
+        if (trustManagers.length != 1) {
+            throw new AssertionError(
+                "Expected exactly one TrustManager, got "
+                + Arrays.toString(trustManagers));
+        }
+        X509TrustManager trustManager = (X509TrustManager) trustManagers[0];
+
+        X509Certificate[] acceptedIssuers = trustManager.getAcceptedIssuers();
+        if (acceptedIssuers.length == 0) {
+            throw new AssertionError(
+                "no accepted issuers - cacerts file configuration problem?");
+        }
+        Arrays.stream(acceptedIssuers)
+            .map(X509Certificate::getIssuerX500Principal)
+            .forEach(System.out::println);
+    }
+}