8273826: Correct Manifest file name and NPE checks

src/java.base/share/classes/java/util/jar/JarFile.java

@@ -758,7 +758,7 @@ private void initializeVerifier() {
                         }
                         if (mev == null) {
                             mev = new ManifestEntryVerifier
-                                (getManifestFromReference());
+                                (getManifestFromReference(), jv.manifestName);
                         }
                         byte[] b = getBytes(e);
                         if (b != null && b.length > 0) {

src/java.base/share/classes/java/util/jar/JarInputStream.java

@@ -96,7 +96,7 @@ private JarEntry checkManifest(JarEntry e)
             closeEntry();
             if (doVerify) {
                 jv = new JarVerifier(e.getName(), bytes);
-                mev = new ManifestEntryVerifier(man);
+                mev = new ManifestEntryVerifier(man, jv.manifestName);
             }
             return (JarEntry)super.getNextEntry();
         }

src/java.base/share/classes/java/util/jar/JarVerifier.java

@@ -444,7 +444,7 @@ static class VerifierStream extends java.io.InputStream {
         {
             this.is = is;
             this.jv = jv;
-            this.mev = new ManifestEntryVerifier(man);
+            this.mev = new ManifestEntryVerifier(man, jv.manifestName);
             this.jv.beginEntry(je, mev);
             this.numLeft = je.getSize();
             if (this.numLeft == 0)

src/java.base/share/classes/sun/security/util/ManifestEntryVerifier.java

@@ -63,7 +63,9 @@ private static class SunProviderHolder {
     ArrayList<byte[]> manifestHashes;
 
     private String name = null;
-    private Manifest man;
+
+    private final String manifestFileName; // never null
+    private final Manifest man;
 
     private boolean skip = true;
 
@@ -74,11 +76,12 @@ private static class SunProviderHolder {
     /**
      * Create a new ManifestEntryVerifier object.
      */
-    public ManifestEntryVerifier(Manifest man)
+    public ManifestEntryVerifier(Manifest man, String manifestFileName)
     {
         createdDigests = new HashMap<>(11);
         digests = new ArrayList<>();
         manifestHashes = new ArrayList<>();
+        this.manifestFileName = manifestFileName;
         this.man = man;
     }
 
@@ -187,7 +190,6 @@ public JarEntry getEntry()
      * the first time we have verified this object, remove its
      * code signers from sigFileSigners and place in verifiedSigners.
      *
-     *
      */
     public CodeSigner[] verify(Hashtable<String, CodeSigner[]> verifiedSigners,
                 Hashtable<String, CodeSigner[]> sigFileSigners)
@@ -209,7 +211,6 @@ public CodeSigner[] verify(Hashtable<String, CodeSigner[]> verifiedSigners,
             getParams(verifiedSigners, sigFileSigners);
 
         for (int i=0; i < digests.size(); i++) {
-
             MessageDigest digest = digests.get(i);
             if (params != null) {
                 try {
@@ -251,7 +252,8 @@ public CodeSigner[] verify(Hashtable<String, CodeSigner[]> verifiedSigners,
     /**
      * Get constraints parameters for JAR. The constraints should be
      * checked against all code signers. Returns the parameters,
-     * or null if the signers for this entry have already been checked.
+     * or null if the signers for this entry have already been checked
+     * or there are no signers for this entry.
      */
     private JarConstraintsParameters getParams(
             Map<String, CodeSigner[]> verifiedSigners,
@@ -262,17 +264,20 @@ private JarConstraintsParameters getParams(
         // the signers of the JAR. But if it doesn't then we need to fallback
         // and check verifiedSigners to see if the signers of this entry have
         // been checked already.
-        if (verifiedSigners.containsKey(JarFile.MANIFEST_NAME)) {
+        if (verifiedSigners.containsKey(manifestFileName)) {
             if (verifiedSigners.size() > 1) {
                 // this means we already checked it previously
                 return null;
             } else {
                 return new JarConstraintsParameters(
-                    verifiedSigners.get(JarFile.MANIFEST_NAME));
+                    verifiedSigners.get(manifestFileName));
             }
         } else {
+            if (debug != null) {
+                debug.println(manifestFileName + " not present in verifiedSigners");
+            }
             CodeSigner[] signers = sigFileSigners.get(name);
-            if (verifiedSigners.containsValue(signers)) {
+            if (signers == null || verifiedSigners.containsValue(signers)) {
                 return null;
             } else {
                 return new JarConstraintsParameters(signers);

test/jdk/sun/security/tools/jarsigner/warnings/LowerCaseManifest.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2021, Oracle and/or its affiliates. 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 jdk.testlibrary.OutputAnalyzer;
+import jdk.test.lib.util.JarUtils;
+
+import java.nio.file.*;
+import java.security.Security;
+import java.util.Collections;
+
+
+/**
+ * @test
+ * @bug 8273826
+ * @summary Test for signed jar file with lowercase META-INF files
+ * @library /lib/testlibrary /test/lib ../
+ * @build jdk.test.lib.util.JarUtils
+ * @run main LowerCaseManifest
+ */
+public class LowerCaseManifest extends Test {
+
+    public static void main(String[] args) throws Throwable {
+        new LowerCaseManifest().start();
+    }
+
+    private void start() throws Throwable {
+        // create a jar file that contains one class file
+        Utils.createFiles(FIRST_FILE);
+        JarUtils.createJar(UNSIGNED_JARFILE, FIRST_FILE);
+
+        // create key pair for jar signing
+        createAlias(CA_KEY_ALIAS, "-ext", "bc:c");
+        createAlias(KEY_ALIAS);
+
+        issueCert(KEY_ALIAS);
+
+        // sign jar
+        OutputAnalyzer analyzer = jarsigner(
+                "-keystore", KEYSTORE,
+                "-verbose",
+                "-storepass", PASSWORD,
+                "-keypass", PASSWORD,
+                "-signedjar", SIGNED_JARFILE,
+                UNSIGNED_JARFILE,
+                KEY_ALIAS);
+
+        checkSigning(analyzer);
+
+        // verify signed jar
+        analyzer = jarsigner(
+                "-verify",
+                "-verbose",
+                "-keystore", KEYSTORE,
+                "-storepass", PASSWORD,
+                "-keypass", PASSWORD,
+                SIGNED_JARFILE,
+                KEY_ALIAS);
+
+        checkVerifying(analyzer, 0, JAR_VERIFIED);
+
+        // verify signed jar in strict mode
+        analyzer = jarsigner(
+                "-verify",
+                "-verbose",
+                "-strict",
+                "-keystore", KEYSTORE,
+                "-storepass", PASSWORD,
+                "-keypass", PASSWORD,
+                SIGNED_JARFILE,
+                KEY_ALIAS);
+
+        checkVerifying(analyzer, 0, JAR_VERIFIED);
+
+        // convert the META-INF/ files to lower case
+        FileSystem fs = FileSystems.newFileSystem(Path.of(SIGNED_JARFILE), null);
+        for (String s : new String[]{"ALIAS.SF",  "ALIAS.RSA", "MANIFEST.MF"}) {
+            Path origPath = fs.getPath("META-INF/" + s);
+            Path lowerCase = fs.getPath("META-INF/" + s.toLowerCase());
+            Files.write(lowerCase, Files.readAllBytes(origPath));
+            Files.delete(origPath);
+        }
+        fs.close();
+
+        // verify signed jar in strict mode (with lower case META-INF names in place)
+        analyzer = jarsigner(
+                "-verify",
+                "-verbose",
+                "-strict",
+                "-J-Djava.security.debug=jar",
+                "-keystore", KEYSTORE,
+                "-storepass", PASSWORD,
+                "-keypass", PASSWORD,
+                SIGNED_JARFILE,
+                KEY_ALIAS);
+
+        checkVerifying(analyzer, 0,
+                JAR_VERIFIED, "!not present in verifiedSigners");
+        System.out.println("Test passed");
+    }
+
+}