Question

在签名jar并使用-tsa选项后，如何验证时间戳是否包含在内？我试过了：

jarsigner -verify -verbose -certs myApp.jar

但是输出没有指定时间戳的任何内容。我问，因为即使我在-tsa URL路径中有拼写错误，jarsigner也会成功。这是GlobalSign TSA URL：http://timestamp.globalsign.com/scripts/timstamp.dll，它背后的服务器显然接受任何路径（即timestamp.globalsign.com/foobar），所以最后我不确定我的jar是否带有时间戳

Answer 1

来自https://blogs.oracle.com/mullan/entry/how_to_determine_if_a：

您可以使用jarsigner实用程序来确定签名的JAR是否已加时间戳，如下所示：

jarsigner -verify -verbose -certs signed.jar

其中signed.jar是您签名的JAR的名称。如果带有时间戳，则输出将包括以下行，表示签名时间：

[entry was signed on 8/2/13 3:48 PM]

如果JAR没有带时间戳，则输出将不包括这些行。

Answer 2

花了最近2个小时寻找这个问题，最后找到了一种方法来确定jar文件是否实际上包含了Signature Block文件中的时间戳信息。我可以在/META-INF/FOO.DSA文件的hexeditor中看到GlobalSign证书，但我找不到任何可以打印出您需要的信息的工具。

您可以将FOO.DSA文件重命名为foo.p7b以在Windows CertMgr中将其打开，但它也不会显示任何时间戳信息。我也没有设法使用OpenSSL来验证DSA文件（它是PKCS＃7文件格式）。

所以我想出了下面的代码，它将显示Time Stamp SignerInfo和创建时间戳的日期。我希望这对你来说是一个好的开始。您需要在类路径中使用bcprov-jdk16-144.jar，bctsp-jdk16-144.jar和bcmail-jdk16-144.jar。从Bouncycastle

获取它们

package de.mhaller.bouncycastle;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.Security;
import java.util.Collection;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;

import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.SignerId;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.cms.SignerInformationStore;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.tsp.TSPException;
import org.bouncycastle.tsp.TimeStampToken;
import org.bouncycastle.tsp.TimeStampTokenInfo;

public class VerifyTimestampSignature {

    private static boolean found;

    public static void main(String[] args) throws Exception {
        if (args == null || args.length != 1) {
            System.out.println("usage: java " + VerifyTimestampSignature.class.getName()
                    + " [jar-file|dsa-file]");
            return;
        }

        BouncyCastleProvider provider = new BouncyCastleProvider();
        Security.addProvider(provider);

        String filename = args[0];

        if (filename.toLowerCase().endsWith(".dsa")) {
            InputStream dsa = new FileInputStream(filename);
            printDSAInfos(filename, dsa);
            return;
        }

        if (filename.toLowerCase().endsWith(".jar")) {
            InputStream jar = new FileInputStream(filename);
            JarInputStream jarInputStream = new JarInputStream(jar);
            JarEntry nextJarEntry;
            do {
                nextJarEntry = jarInputStream.getNextJarEntry();
                if (nextJarEntry == null) {
                    break;
                }
                if (nextJarEntry.getName().toLowerCase().endsWith(".dsa")) {
                    printDSAInfos(nextJarEntry.getName(), jarInputStream);
                }
            } while (nextJarEntry != null);
        }

        if (!found) {
            System.out.println("No certificate with time stamp information found in " + filename);
        } else {
            System.out.println("Found at least one time stamp info");
            System.out.println("Note: But it was NOT verified for validity!");
        }
    }

    private static void printDSAInfos(String file, InputStream dsa) throws CMSException,
            IOException, TSPException {
        System.out.println("Retrieving time stamp token from: " + file);
        CMSSignedData signature = new CMSSignedData(dsa);
        SignerInformationStore store = signature.getSignerInfos();
        Collection<?> signers = store.getSigners();
        for (Object object : signers) {
            SignerInformation signerInform = (SignerInformation) object;
            AttributeTable attrs = signerInform.getUnsignedAttributes();
            if (attrs == null) {
                System.err
                        .println("Signer Information does not contain any unsigned attributes. A signed jar file with Timestamp information should contain unsigned attributes.");
                continue;
            }
            Attribute attribute = attrs.get(PKCSObjectIdentifiers.id_aa_signatureTimeStampToken);
            DEREncodable dob = attribute.getAttrValues().getObjectAt(0);
            CMSSignedData signedData = new CMSSignedData(dob.getDERObject().getEncoded());
            TimeStampToken tst = new TimeStampToken(signedData);

            SignerId signerId = tst.getSID();
            System.out.println("Signer: " + signerId.toString());

            TimeStampTokenInfo tstInfo = tst.getTimeStampInfo();
            System.out.println("Timestamp generated: " + tstInfo.getGenTime());
            found = true;
        }
    }
}

Answer 3

Java keytool可以确认签名的JAR是否带有时间戳，并且还可以显示TSA的证书：

$ keytool -printcert -jarfile myApp.jar

...

Timestamp:

Owner: CN=GeoTrust Timestamping Signer 1, O=GeoTrust Inc, C=US
Issuer: CN=Thawte Timestamping CA, OU=Thawte Certification, O=Thawte, L=Durbanville, ST=Western Cape, C=ZA
Serial number: 5e8d2daca44665546bb587978191a8bf
Valid from: Wed Oct 31 00:00:00 GMT 2007 until: Mon Oct 30 23:59:59 GMT 2017
Certificate fingerprints:
     MD5:  E5:30:07:8E:91:8D:A0:6C:18:6D:91:2A:B6:D2:3A:56
     SHA1: 22:3C:DA:27:07:96:73:81:6B:60:8A:1B:8C:B0:AB:02:30:10:7F:CC
     SHA256: D7:B8:44:BD:39:5A:17:36:02:39:51:C6:4D:6C:81:65:45:93:AD:29:1D:DC:E4:6C:8D:79:B6:65:DF:31:0C:F6
     Signature algorithm name: SHA1withRSA
     Version: 3

...

Answer 4

mhaller提供了很棒的代码（printDSAInfos）。在我的工作中帮助了我。但是需要进行一些更改。 DEREncodable类现在更改为ASN1Encodable，getDERObject（）方法更改为ASN1Primitive。所以代码看起来像这样

    ASN1Encodable dob = attribute.getAttrValues().getObjectAt(0);
    CMSSignedData signedData = new CMSSignedData(dob.toASN1Primitive().getEncoded());

如何验证签名的jar是否包含时间戳？

4 个答案: