8341775: Duplicate manifest files are removed by jarsigner after signing

Reviewed-by: weijun, hchao

src/jdk.jartool/share/classes/sun/security/tools/jarsigner/Main.java

@@ -237,6 +237,7 @@ public class Main {
     private boolean badNetscapeCertType = false;
     private boolean signerSelfSigned = false;
     private boolean allAliasesFound = true;
+    private boolean hasMultipleManifests = false;
 
     private Throwable chainNotValidatedReason = null;
     private Throwable tsaChainNotValidatedReason = null;
@@ -1252,6 +1253,11 @@ public class Main {
                         rb.getString("The.full.keyAlgName.signing.key.is.considered.a.security.risk.and.is.disabled."),
                         fullDisplayKeyName(privateKey)));
             }
+
+            if (hasMultipleManifests) {
+                warnings.add(String.format(rb.getString("multiple.manifest.warning.")));
+            }
+
         } else {
             if ((legacyAlg & 1) != 0) {
                 warnings.add(String.format(
@@ -1965,6 +1971,15 @@ public class Main {
         Throwable failedCause = null;
         String failedMessage = null;
 
+        try (JarFile asJar = new JarFile(jarFile)) {
+            if (JUZFA.getManifestNum(asJar) > 1) {
+                hasMultipleManifests = true;
+            }
+        } catch (IOException ioe) {
+            // intentionally "eat" this, since we don't want to fail, if we
+            // cannot perform the multiple manifest check to output the warning
+        }
+
         try {
             Event.setReportListener(Event.ReporterCategory.ZIPFILEATTRS,
                     (t, o) -> externalFileAttributesDetected = true);

src/jdk.jartool/share/classes/sun/security/tools/jarsigner/resources/jarsigner.properties

@@ -96,6 +96,7 @@ jar.is.unsigned=jar is unsigned.
 jar.treated.unsigned=WARNING: Signature is either not parsable or not verifiable, and the jar will be treated as unsigned. For more information, re-run jarsigner with debug enabled (-J-Djava.security.debug=jar).
 jar.treated.unsigned.see.weak=The jar will be treated as unsigned, because it is signed with a weak algorithm that is now disabled.\n\nRe-run jarsigner with the -verbose option for more details.
 jar.treated.unsigned.see.weak.verbose=WARNING: The jar will be treated as unsigned, because it is signed with a weak algorithm that is now disabled by the security property:
+multiple.manifest.warning.=Duplicate manifest entries were detected in the jar file. JarSigner operated on only one, and the others have been discarded.
 jar.signed.=jar signed.
 jar.signed.with.signer.errors.=jar signed, with signer errors.
 jar.verified.=jar verified.

src/jdk.jartool/share/man/jarsigner.md

@@ -1,5 +1,5 @@
 ---
-# Copyright (c) 1998, 2024, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 1998, 2025, 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
@@ -922,6 +922,10 @@ hasExpiringCert
 hasExpiringTsaCert
 :   The timestamp will expire within one year on `YYYY-MM-DD`.
 
+hasMultipleManifests
+:   This JAR contained multiple manifest files. During signing, one of the files
+was selected, and the others were discarded.
+
 hasNonexistentEntries
 :   This JAR contains signed entries for files that do not exist.
 

test/jdk/sun/security/tools/jarsigner/MultiManifest.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2025, 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.
+ */
+
+/*
+ * @test
+ * @bug 8341775
+ * @summary Print warning that duplicate manifest files are removed by jarsigner
+ *  after signing whether or not -verbose is passed
+ * @library /test/lib
+ */
+
+import jdk.test.lib.SecurityTools;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.jar.JarFile;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+public class MultiManifest {
+
+    private static final String META_INF = "META-INF/";
+
+    public static void main(String[] args) throws Exception {
+
+        writeMultiManifestJar();
+
+        SecurityTools.keytool("-keystore ks -storepass changeit "
+                + "-keypass changeit -alias a -dname CN=a -keyalg rsa "
+                + "-genkey -validity 300");
+
+        SecurityTools.jarsigner("-verbose -keystore ks -storepass changeit "
+                                + "MultiManifest.jar -signedjar MultiManifest.signed.jar a")
+                .shouldHaveExitValue(0)
+                .shouldContain("Duplicate manifest entries were detected")
+                .shouldContain("discarded");
+
+        SecurityTools.jarsigner("-keystore ks -storepass changeit "
+                                + "MultiManifest.jar -signedjar MultiManifest.signed.jar a")
+                 .shouldHaveExitValue(0)
+                 .shouldContain("Duplicate manifest entries were detected")
+                 .shouldContain("discarded");
+
+    }
+
+    public static void writeMultiManifestJar() throws IOException {
+        int locPosA, locPosB, cenPos;
+        var out = new ByteArrayOutputStream(1024);
+        try (var zos = new ZipOutputStream(out)) {
+            zos.putNextEntry(new ZipEntry(JarFile.MANIFEST_NAME));
+            zos.closeEntry();
+            locPosA = out.size();
+            zos.putNextEntry(new ZipEntry(META_INF + "AANIFEST.MF"));
+            zos.closeEntry();
+            locPosB = out.size();
+            zos.putNextEntry(new ZipEntry(META_INF + "BANIFEST.MF"));
+            zos.flush();
+            cenPos = out.size();
+        }
+        var template = out.toByteArray();
+        // ISO_8859_1 to keep the 8-bit value
+        var s = new String(template, StandardCharsets.ISO_8859_1);
+        // change META-INF/AANIFEST.MF to META-INF/MANIFEST.MF
+        var loc = s.indexOf("AANIFEST.MF", locPosA);
+        var cen = s.indexOf("AANIFEST.MF", cenPos);
+        template[loc] = template[cen] = (byte) 'M';
+        // change META-INF/BANIFEST.MF to META-INF/MANIFEST.MF
+        loc = s.indexOf("BANIFEST.MF", locPosB);
+        cen = s.indexOf("BANIFEST.MF", cenPos);
+        template[loc] = template[cen] = (byte) 'M';
+        Files.write(Path.of("MultiManifest.jar"), template);
+    }
+}