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Merge pull request #650 from Stirling-Tools/cert-sign

fix: pdf certificate signing
This commit is contained in:
Anthony Stirling 2024-01-04 18:54:40 +00:00 committed by GitHub
commit bd7e2fea0b
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 849 additions and 345 deletions

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@ -85,13 +85,13 @@ Hosted instance/demo of the app can be seen [here](https://pdf.adminforge.de/) h
## Technologies used
- Spring Boot + Thymeleaf
- PDFBox
- [PDFBox](https://github.com/apache/pdfbox/tree/trunk)
- [LibreOffice](https://www.libreoffice.org/discover/libreoffice/) for advanced conversions
- [OcrMyPdf](https://github.com/ocrmypdf/OCRmyPDF)
- HTML, CSS, JavaScript
- Docker
- PDF.js
- PDF-LIB.js
- [PDF.js](https://github.com/mozilla/pdf.js)
- [PDF-LIB.js](https://github.com/Hopding/pdf-lib)
## How to use

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@ -0,0 +1,64 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.examples.signature;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSTypedData;
/**
* Wraps a InputStream into a CMSProcessable object for bouncy castle. It's a memory saving
* alternative to the {@link org.bouncycastle.cms.CMSProcessableByteArray CMSProcessableByteArray}
* class.
*
* @author Thomas Chojecki
*/
class CMSProcessableInputStream implements CMSTypedData {
private final InputStream in;
private final ASN1ObjectIdentifier contentType;
CMSProcessableInputStream(InputStream is) {
this(new ASN1ObjectIdentifier(CMSObjectIdentifiers.data.getId()), is);
}
CMSProcessableInputStream(ASN1ObjectIdentifier type, InputStream is) {
contentType = type;
in = is;
}
@Override
public Object getContent() {
return in;
}
@Override
public void write(OutputStream out) throws IOException, CMSException {
// read the content only one time
in.transferTo(out);
in.close();
}
@Override
public ASN1ObjectIdentifier getContentType() {
return contentType;
}
}

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@ -0,0 +1,170 @@
/*
* Copyright 2015 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.examples.signature;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.UnrecoverableKeyException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.Enumeration;
import org.apache.pdfbox.pdmodel.interactive.digitalsignature.SignatureInterface;
import org.bouncycastle.cert.jcajce.JcaCertStore;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignedDataGenerator;
import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
public abstract class CreateSignatureBase implements SignatureInterface {
private PrivateKey privateKey;
private Certificate[] certificateChain;
private String tsaUrl;
private boolean externalSigning;
/**
* Initialize the signature creator with a keystore (pkcs12) and pin that should be used for the
* signature.
*
* @param keystore is a pkcs12 keystore.
* @param pin is the pin for the keystore / private key
* @throws KeyStoreException if the keystore has not been initialized (loaded)
* @throws NoSuchAlgorithmException if the algorithm for recovering the key cannot be found
* @throws UnrecoverableKeyException if the given password is wrong
* @throws CertificateException if the certificate is not valid as signing time
* @throws IOException if no certificate could be found
*/
public CreateSignatureBase(KeyStore keystore, char[] pin)
throws KeyStoreException,
UnrecoverableKeyException,
NoSuchAlgorithmException,
IOException,
CertificateException {
// grabs the first alias from the keystore and get the private key. An
// alternative method or constructor could be used for setting a specific
// alias that should be used.
Enumeration<String> aliases = keystore.aliases();
String alias;
Certificate cert = null;
while (cert == null && aliases.hasMoreElements()) {
alias = aliases.nextElement();
setPrivateKey((PrivateKey) keystore.getKey(alias, pin));
Certificate[] certChain = keystore.getCertificateChain(alias);
if (certChain != null) {
setCertificateChain(certChain);
cert = certChain[0];
if (cert instanceof X509Certificate) {
// avoid expired certificate
((X509Certificate) cert).checkValidity();
//// SigUtils.checkCertificateUsage((X509Certificate) cert);
}
}
}
if (cert == null) {
throw new IOException("Could not find certificate");
}
}
public final void setPrivateKey(PrivateKey privateKey) {
this.privateKey = privateKey;
}
public final void setCertificateChain(final Certificate[] certificateChain) {
this.certificateChain = certificateChain;
}
public Certificate[] getCertificateChain() {
return certificateChain;
}
public void setTsaUrl(String tsaUrl) {
this.tsaUrl = tsaUrl;
}
/**
* SignatureInterface sample implementation.
*
* <p>This method will be called from inside of the pdfbox and create the PKCS #7 signature. The
* given InputStream contains the bytes that are given by the byte range.
*
* <p>This method is for internal use only.
*
* <p>Use your favorite cryptographic library to implement PKCS #7 signature creation. If you
* want to create the hash and the signature separately (e.g. to transfer only the hash to an
* external application), read <a href="https://stackoverflow.com/questions/41767351">this
* answer</a> or <a href="https://stackoverflow.com/questions/56867465">this answer</a>.
*
* @throws IOException
*/
@Override
public byte[] sign(InputStream content) throws IOException {
// cannot be done private (interface)
try {
CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
X509Certificate cert = (X509Certificate) certificateChain[0];
ContentSigner sha1Signer =
new JcaContentSignerBuilder("SHA256WithRSA").build(privateKey);
gen.addSignerInfoGenerator(
new JcaSignerInfoGeneratorBuilder(
new JcaDigestCalculatorProviderBuilder().build())
.build(sha1Signer, cert));
gen.addCertificates(new JcaCertStore(Arrays.asList(certificateChain)));
CMSProcessableInputStream msg = new CMSProcessableInputStream(content);
CMSSignedData signedData = gen.generate(msg, false);
if (tsaUrl != null && !tsaUrl.isEmpty()) {
ValidationTimeStamp validation = new ValidationTimeStamp(tsaUrl);
signedData = validation.addSignedTimeStamp(signedData);
}
return signedData.getEncoded();
} catch (GeneralSecurityException
| CMSException
| OperatorCreationException
| URISyntaxException e) {
throw new IOException(e);
}
}
/**
* Set if external signing scenario should be used. If {@code false}, SignatureInterface would
* be used for signing.
*
* <p>Default: {@code false}
*
* @param externalSigning {@code true} if external signing should be performed
*/
public void setExternalSigning(boolean externalSigning) {
this.externalSigning = externalSigning;
}
public boolean isExternalSigning() {
return externalSigning;
}
}

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@ -0,0 +1,176 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.examples.signature;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.Base64;
import java.util.Random;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DigestAlgorithmIdentifierFinder;
import org.bouncycastle.tsp.TSPException;
import org.bouncycastle.tsp.TimeStampRequest;
import org.bouncycastle.tsp.TimeStampRequestGenerator;
import org.bouncycastle.tsp.TimeStampResponse;
import org.bouncycastle.tsp.TimeStampToken;
/**
* Time Stamping Authority (TSA) Client [RFC 3161].
*
* @author Vakhtang Koroghlishvili
* @author John Hewson
*/
public class TSAClient {
private static final Logger LOG = LogManager.getLogger(TSAClient.class);
private static final DigestAlgorithmIdentifierFinder ALGORITHM_OID_FINDER =
new DefaultDigestAlgorithmIdentifierFinder();
private final URL url;
private final String username;
private final String password;
private final MessageDigest digest;
// SecureRandom.getInstanceStrong() would be better, but sometimes blocks on Linux
private static final Random RANDOM = new SecureRandom();
/**
* @param url the URL of the TSA service
* @param username user name of TSA
* @param password password of TSA
* @param digest the message digest to use
*/
public TSAClient(URL url, String username, String password, MessageDigest digest) {
this.url = url;
this.username = username;
this.password = password;
this.digest = digest;
}
/**
* @param content
* @return the time stamp token
* @throws IOException if there was an error with the connection or data from the TSA server, or
* if the time stamp response could not be validated
*/
public TimeStampToken getTimeStampToken(InputStream content) throws IOException {
digest.reset();
DigestInputStream dis = new DigestInputStream(content, digest);
while (dis.read() != -1) {
// do nothing
}
byte[] hash = digest.digest();
// 32-bit cryptographic nonce
int nonce = RANDOM.nextInt();
// generate TSA request
TimeStampRequestGenerator tsaGenerator = new TimeStampRequestGenerator();
tsaGenerator.setCertReq(true);
ASN1ObjectIdentifier oid = ALGORITHM_OID_FINDER.find(digest.getAlgorithm()).getAlgorithm();
TimeStampRequest request = tsaGenerator.generate(oid, hash, BigInteger.valueOf(nonce));
// get TSA response
byte[] tsaResponse = getTSAResponse(request.getEncoded());
TimeStampResponse response;
try {
response = new TimeStampResponse(tsaResponse);
response.validate(request);
} catch (TSPException e) {
throw new IOException(e);
}
TimeStampToken timeStampToken = response.getTimeStampToken();
if (timeStampToken == null) {
// https://www.ietf.org/rfc/rfc3161.html#section-2.4.2
throw new IOException(
"Response from "
+ url
+ " does not have a time stamp token, status: "
+ response.getStatus()
+ " ("
+ response.getStatusString()
+ ")");
}
return timeStampToken;
}
// gets response data for the given encoded TimeStampRequest data
// throws IOException if a connection to the TSA cannot be established
private byte[] getTSAResponse(byte[] request) throws IOException {
LOG.debug("Opening connection to TSA server");
// todo: support proxy servers
URLConnection connection = url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestProperty("Content-Type", "application/timestamp-query");
LOG.debug("Established connection to TSA server");
if (username != null && password != null && !username.isEmpty() && !password.isEmpty()) {
String contentEncoding = connection.getContentEncoding();
if (contentEncoding == null) {
contentEncoding = StandardCharsets.UTF_8.name();
}
connection.setRequestProperty(
"Authorization",
"Basic "
+ new String(
Base64.getEncoder()
.encode(
(username + ":" + password)
.getBytes(contentEncoding))));
}
// read response
try (OutputStream output = connection.getOutputStream()) {
output.write(request);
} catch (IOException ex) {
LOG.error("Exception when writing to {}", this.url, ex);
throw ex;
}
LOG.debug("Waiting for response from TSA server");
byte[] response;
try (InputStream input = connection.getInputStream()) {
response = input.readAllBytes();
} catch (IOException ex) {
LOG.error("Exception when reading from {}", this.url, ex);
throw ex;
}
LOG.debug("Received response from TSA server");
return response;
}
}

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@ -0,0 +1,134 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.examples.signature;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.List;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.Attributes;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.cms.SignerInformationStore;
import org.bouncycastle.tsp.TimeStampToken;
/**
* This class wraps the TSAClient and the work that has to be done with it. Like Adding Signed
* TimeStamps to a signature, or creating a CMS timestamp attribute (with a signed timestamp)
*
* @author Others
* @author Alexis Suter
*/
public class ValidationTimeStamp {
private TSAClient tsaClient;
/**
* @param tsaUrl The url where TS-Request will be done.
* @throws NoSuchAlgorithmException
* @throws MalformedURLException
* @throws java.net.URISyntaxException
*/
public ValidationTimeStamp(String tsaUrl)
throws NoSuchAlgorithmException, MalformedURLException, URISyntaxException {
if (tsaUrl != null) {
MessageDigest digest = MessageDigest.getInstance("SHA-256");
this.tsaClient = new TSAClient(new URI(tsaUrl).toURL(), null, null, digest);
}
}
/**
* Creates a signed timestamp token by the given input stream.
*
* @param content InputStream of the content to sign
* @return the byte[] of the timestamp token
* @throws IOException
*/
public byte[] getTimeStampToken(InputStream content) throws IOException {
TimeStampToken timeStampToken = tsaClient.getTimeStampToken(content);
return timeStampToken.getEncoded();
}
/**
* Extend cms signed data with TimeStamp first or to all signers
*
* @param signedData Generated CMS signed data
* @return CMSSignedData Extended CMS signed data
* @throws IOException
*/
public CMSSignedData addSignedTimeStamp(CMSSignedData signedData) throws IOException {
SignerInformationStore signerStore = signedData.getSignerInfos();
List<SignerInformation> newSigners = new ArrayList<>();
for (SignerInformation signer : signerStore.getSigners()) {
// This adds a timestamp to every signer (into his unsigned attributes) in the
// signature.
newSigners.add(signTimeStamp(signer));
}
// Because new SignerInformation is created, new SignerInfoStore has to be created
// and also be replaced in signedData. Which creates a new signedData object.
return CMSSignedData.replaceSigners(signedData, new SignerInformationStore(newSigners));
}
/**
* Extend CMS Signer Information with the TimeStampToken into the unsigned Attributes.
*
* @param signer information about signer
* @return information about SignerInformation
* @throws IOException
*/
private SignerInformation signTimeStamp(SignerInformation signer) throws IOException {
AttributeTable unsignedAttributes = signer.getUnsignedAttributes();
ASN1EncodableVector vector = new ASN1EncodableVector();
if (unsignedAttributes != null) {
vector = unsignedAttributes.toASN1EncodableVector();
}
TimeStampToken timeStampToken =
tsaClient.getTimeStampToken(new ByteArrayInputStream(signer.getSignature()));
byte[] token = timeStampToken.getEncoded();
ASN1ObjectIdentifier oid = PKCSObjectIdentifiers.id_aa_signatureTimeStampToken;
ASN1Encodable signatureTimeStamp =
new Attribute(oid, new DERSet(ASN1Primitive.fromByteArray(token)));
vector.add(signatureTimeStamp);
Attributes signedAttributes = new Attributes(vector);
// There is no other way changing the unsigned attributes of the signer information.
// result is never null, new SignerInformation always returned,
// see source code of replaceUnsignedAttributes
return SignerInformation.replaceUnsignedAttributes(
signer, new AttributeTable(signedAttributes));
}
}

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@ -0,0 +1,82 @@
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.pdfbox.examples.util;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
/**
* Delegate class to close the connection when the class gets closed.
*
* @author Tilman Hausherr
*/
public class ConnectedInputStream extends InputStream {
HttpURLConnection con;
InputStream is;
public ConnectedInputStream(HttpURLConnection con, InputStream is) {
this.con = con;
this.is = is;
}
@Override
public int read() throws IOException {
return is.read();
}
@Override
public int read(byte[] b) throws IOException {
return is.read(b);
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
return is.read(b, off, len);
}
@Override
public long skip(long n) throws IOException {
return is.skip(n);
}
@Override
public int available() throws IOException {
return is.available();
}
@Override
public synchronized void mark(int readlimit) {
is.mark(readlimit);
}
@Override
public synchronized void reset() throws IOException {
is.reset();
}
@Override
public boolean markSupported() {
return is.markSupported();
}
@Override
public void close() throws IOException {
is.close();
con.disconnect();
}
}

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@ -4,44 +4,34 @@ import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.security.KeyFactory;
import java.io.OutputStream;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Security;
import java.security.UnrecoverableKeyException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.PKCS8EncodedKeySpec;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Collections;
import java.util.Date;
import org.apache.commons.io.IOUtils;
import org.apache.pdfbox.examples.signature.CreateSignatureBase;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationWidget;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceDictionary;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceStream;
import org.apache.pdfbox.pdmodel.interactive.digitalsignature.ExternalSigningSupport;
import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature;
import org.apache.pdfbox.pdmodel.interactive.digitalsignature.SignatureOptions;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField;
import org.bouncycastle.cert.jcajce.JcaCertStore;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignedDataGenerator;
import org.bouncycastle.cms.CMSTypedData;
import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
import org.bouncycastle.util.io.pem.PemReader;
import org.bouncycastle.openssl.PEMDecryptorProvider;
import org.bouncycastle.openssl.PEMEncryptedKeyPair;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
import org.bouncycastle.openssl.jcajce.JceOpenSSLPKCS8DecryptorProviderBuilder;
import org.bouncycastle.openssl.jcajce.JcePEMDecryptorProviderBuilder;
import org.bouncycastle.operator.InputDecryptorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.pkcs.PKCS8EncryptedPrivateKeyInfo;
import org.bouncycastle.pkcs.PKCSException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.ResponseEntity;
@ -68,6 +58,17 @@ public class CertSignController {
Security.addProvider(new BouncyCastleProvider());
}
class CreateSignature extends CreateSignatureBase {
public CreateSignature(KeyStore keystore, char[] pin)
throws KeyStoreException,
UnrecoverableKeyException,
NoSuchAlgorithmException,
IOException,
CertificateException {
super(keystore, pin);
}
}
@PostMapping(consumes = "multipart/form-data", value = "/cert-sign")
@Operation(
summary = "Sign PDF with a Digital Certificate",
@ -80,6 +81,7 @@ public class CertSignController {
MultipartFile privateKeyFile = request.getPrivateKeyFile();
MultipartFile certFile = request.getCertFile();
MultipartFile p12File = request.getP12File();
MultipartFile jksfile = request.getJksFile();
String password = request.getPassword();
Boolean showSignature = request.isShowSignature();
String reason = request.getReason();
@ -87,203 +89,94 @@ public class CertSignController {
String name = request.getName();
Integer pageNumber = request.getPageNumber();
PrivateKey privateKey = null;
X509Certificate cert = null;
if (certType != null) {
logger.info("Cert type provided: {}", certType);
switch (certType) {
case "PKCS12":
if (p12File != null) {
KeyStore ks = KeyStore.getInstance("PKCS12");
ks.load(
new ByteArrayInputStream(p12File.getBytes()),
password.toCharArray());
String alias = ks.aliases().nextElement();
if (!ks.isKeyEntry(alias)) {
throw new IllegalArgumentException(
"The provided PKCS12 file does not contain a private key.");
}
privateKey = (PrivateKey) ks.getKey(alias, password.toCharArray());
cert = (X509Certificate) ks.getCertificate(alias);
}
break;
case "PEM":
if (privateKeyFile != null && certFile != null) {
// Load private key
KeyFactory keyFactory =
KeyFactory.getInstance("RSA", BouncyCastleProvider.PROVIDER_NAME);
if (isPEM(privateKeyFile.getBytes())) {
privateKey =
keyFactory.generatePrivate(
new PKCS8EncodedKeySpec(
parsePEM(privateKeyFile.getBytes())));
} else {
privateKey =
keyFactory.generatePrivate(
new PKCS8EncodedKeySpec(privateKeyFile.getBytes()));
}
// Load certificate
CertificateFactory certFactory =
CertificateFactory.getInstance(
"X.509", BouncyCastleProvider.PROVIDER_NAME);
if (isPEM(certFile.getBytes())) {
cert =
(X509Certificate)
certFactory.generateCertificate(
new ByteArrayInputStream(
parsePEM(certFile.getBytes())));
} else {
cert =
(X509Certificate)
certFactory.generateCertificate(
new ByteArrayInputStream(certFile.getBytes()));
}
}
break;
}
if (certType == null) {
throw new IllegalArgumentException("Cert type must be provided");
}
PDSignature signature = new PDSignature();
signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE); // default filter
signature.setSubFilter(PDSignature.SUBFILTER_ADBE_PKCS7_SHA1);
signature.setName(name);
signature.setLocation(location);
signature.setReason(reason);
signature.setSignDate(Calendar.getInstance());
// Load the PDF
try (PDDocument document = PDDocument.load(pdf.getBytes())) {
logger.info("Successfully loaded the provided PDF");
SignatureOptions signatureOptions = new SignatureOptions();
KeyStore ks = null;
// If you want to show the signature
switch (certType) {
case "PEM":
ks = KeyStore.getInstance("JKS");
ks.load(null);
PrivateKey privateKey = getPrivateKeyFromPEM(privateKeyFile.getBytes(), password);
Certificate cert = (Certificate) getCertificateFromPEM(certFile.getBytes());
ks.setKeyEntry(
"alias", privateKey, password.toCharArray(), new Certificate[] {cert});
break;
case "PKCS12":
ks = KeyStore.getInstance("PKCS12");
ks.load(p12File.getInputStream(), password.toCharArray());
break;
case "JKS":
ks = KeyStore.getInstance("JKS");
ks.load(jksfile.getInputStream(), password.toCharArray());
break;
default:
throw new IllegalArgumentException("Invalid cert type: " + certType);
}
// ATTEMPT 2
if (showSignature != null && showSignature) {
PDPage page = document.getPage(pageNumber - 1);
// TODO: page number
PDAcroForm acroForm = document.getDocumentCatalog().getAcroForm();
if (acroForm == null) {
acroForm = new PDAcroForm(document);
document.getDocumentCatalog().setAcroForm(acroForm);
}
CreateSignature createSignature = new CreateSignature(ks, password.toCharArray());
ByteArrayOutputStream baos = new ByteArrayOutputStream();
sign(pdf.getBytes(), baos, createSignature, name, location, reason);
return WebResponseUtils.boasToWebResponse(
baos, pdf.getOriginalFilename().replaceFirst("[.][^.]+$", "") + "_signed.pdf");
}
// Create a new signature field and widget
private static void sign(
byte[] input,
OutputStream output,
CreateSignature instance,
String name,
String location,
String reason) {
try (PDDocument doc = PDDocument.load(input)) {
PDSignature signature = new PDSignature();
signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE);
signature.setSubFilter(PDSignature.SUBFILTER_ADBE_PKCS7_DETACHED);
signature.setName(name);
signature.setLocation(location);
signature.setReason(reason);
signature.setSignDate(Calendar.getInstance());
PDSignatureField signatureField = new PDSignatureField(acroForm);
PDAnnotationWidget widget = signatureField.getWidgets().get(0);
PDRectangle rect =
new PDRectangle(100, 100, 200, 50); // Define the rectangle size here
widget.setRectangle(rect);
page.getAnnotations().add(widget);
// Set the appearance for the signature field
PDAppearanceDictionary appearanceDict = new PDAppearanceDictionary();
PDAppearanceStream appearanceStream = new PDAppearanceStream(document);
appearanceStream.setResources(new PDResources());
appearanceStream.setBBox(rect);
appearanceDict.setNormalAppearance(appearanceStream);
widget.setAppearance(appearanceDict);
try (PDPageContentStream contentStream =
new PDPageContentStream(document, appearanceStream)) {
contentStream.beginText();
contentStream.setFont(PDType1Font.HELVETICA_BOLD, 12);
contentStream.newLineAtOffset(110, 130);
contentStream.showText(
"Digitally signed by: " + (name != null ? name : "Unknown"));
contentStream.newLineAtOffset(0, -15);
contentStream.showText(
"Date: "
+ new SimpleDateFormat("yyyy.MM.dd HH:mm:ss z")
.format(new Date()));
contentStream.newLineAtOffset(0, -15);
if (reason != null && !reason.isEmpty()) {
contentStream.showText("Reason: " + reason);
contentStream.newLineAtOffset(0, -15);
}
if (location != null && !location.isEmpty()) {
contentStream.showText("Location: " + location);
contentStream.newLineAtOffset(0, -15);
}
contentStream.endText();
}
// Add the widget annotation to the page
page.getAnnotations().add(widget);
// Add the signature field to the acroform
acroForm.getFields().add(signatureField);
// Handle multiple signatures by ensuring a unique field name
String baseFieldName = "Signature";
String signatureFieldName = baseFieldName;
int suffix = 1;
while (acroForm.getField(signatureFieldName) != null) {
suffix++;
signatureFieldName = baseFieldName + suffix;
}
signatureField.setPartialName(signatureFieldName);
}
document.addSignature(signature, signatureOptions);
logger.info("Signature added to the PDF document");
// External signing
ExternalSigningSupport externalSigning =
document.saveIncrementalForExternalSigning(new ByteArrayOutputStream());
byte[] content = IOUtils.toByteArray(externalSigning.getContent());
// Using BouncyCastle to sign
CMSTypedData cmsData = new CMSProcessableByteArray(content);
CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
ContentSigner signer =
new JcaContentSignerBuilder("SHA256withRSA")
.setProvider(BouncyCastleProvider.PROVIDER_NAME)
.build(privateKey);
gen.addSignerInfoGenerator(
new JcaSignerInfoGeneratorBuilder(
new JcaDigestCalculatorProviderBuilder()
.setProvider(BouncyCastleProvider.PROVIDER_NAME)
.build())
.build(signer, cert));
gen.addCertificates(new JcaCertStore(Collections.singletonList(cert)));
CMSSignedData signedData = gen.generate(cmsData, false);
byte[] cmsSignature = signedData.getEncoded();
logger.info("About to sign content using BouncyCastle");
externalSigning.setSignature(cmsSignature);
logger.info("Signature set successfully");
// After setting the signature, return the resultant PDF
try (ByteArrayOutputStream signedPdfOutput = new ByteArrayOutputStream()) {
document.save(signedPdfOutput);
return WebResponseUtils.boasToWebResponse(
signedPdfOutput,
pdf.getOriginalFilename().replaceFirst("[.][^.]+$", "") + "_signed.pdf");
} catch (Exception e) {
e.printStackTrace();
}
doc.addSignature(signature, instance);
doc.saveIncremental(output);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private byte[] parsePEM(byte[] content) throws IOException {
PemReader pemReader =
new PemReader(new InputStreamReader(new ByteArrayInputStream(content)));
return pemReader.readPemObject().getContent();
private PrivateKey getPrivateKeyFromPEM(byte[] pemBytes, String password)
throws IOException, OperatorCreationException, PKCSException {
try (PEMParser pemParser =
new PEMParser(new InputStreamReader(new ByteArrayInputStream(pemBytes)))) {
Object pemObject = pemParser.readObject();
JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC");
PrivateKeyInfo pkInfo;
if (pemObject instanceof PKCS8EncryptedPrivateKeyInfo) {
InputDecryptorProvider decProv =
new JceOpenSSLPKCS8DecryptorProviderBuilder().build(password.toCharArray());
pkInfo = ((PKCS8EncryptedPrivateKeyInfo) pemObject).decryptPrivateKeyInfo(decProv);
} else if (pemObject instanceof PEMEncryptedKeyPair) {
PEMDecryptorProvider decProv =
new JcePEMDecryptorProviderBuilder().build(password.toCharArray());
pkInfo =
((PEMEncryptedKeyPair) pemObject)
.decryptKeyPair(decProv)
.getPrivateKeyInfo();
} else {
pkInfo = ((PEMKeyPair) pemObject).getPrivateKeyInfo();
}
return converter.getPrivateKey(pkInfo);
}
}
private boolean isPEM(byte[] content) {
String contentStr = new String(content);
return contentStr.contains("-----BEGIN") && contentStr.contains("-----END");
private Certificate getCertificateFromPEM(byte[] pemBytes)
throws IOException, CertificateException {
try (ByteArrayInputStream bis = new ByteArrayInputStream(pemBytes)) {
return CertificateFactory.getInstance("X.509").generateCertificate(bis);
}
}
}

View File

@ -14,7 +14,7 @@ public class SignPDFWithCertRequest extends PDFFile {
@Schema(
description = "The type of the digital certificate",
allowableValues = {"PKCS12", "PEM"})
allowableValues = {"PEM", "PKCS12", "JKS"})
private String certType;
@Schema(
@ -28,6 +28,9 @@ public class SignPDFWithCertRequest extends PDFFile {
@Schema(description = "The PKCS12 keystore file (required for PKCS12 type certificates)")
private MultipartFile p12File;
@Schema(description = "The JKS keystore file (Java Key Store)")
private MultipartFile jksFile;
@Schema(description = "The password for the keystore or the private key")
private String password;

View File

@ -546,9 +546,11 @@ scalePages.submit=Submit
certSign.title=Certificate Signing
certSign.header=Sign a PDF with your certificate (Work in progress)
certSign.selectPDF=Select a PDF File for Signing:
certSign.jksNote=Note: If your certificate type is not listed below, please convert it to a Java Keystore (.jks) file using the keytool command line tool. Then, choose the .jks file option below.
certSign.selectKey=Select Your Private Key File (PKCS#8 format, could be .pem or .der):
certSign.selectCert=Select Your Certificate File (X.509 format, could be .pem or .der):
certSign.selectP12=Select Your PKCS#12 Keystore File (.p12 or .pfx) (Optional, If provided, it should contain your private key and certificate):
certSign.selectJKS=Select Your Java Keystore File (.jks or .keystore):
certSign.certType=Certificate Type
certSign.password=Enter Your Keystore or Private Key Password (If Any):
certSign.showSig=Show Signature

View File

@ -546,9 +546,11 @@ scalePages.submit=Submit
certSign.title=Certificate Signing
certSign.header=Sign a PDF with your certificate (Work in progress)
certSign.selectPDF=Select a PDF File for Signing:
certSign.jksNote=Note: If your certificate type is not listed below, please convert it to a Java Keystore (.jks) file using the keytool command line tool. Then, choose the .jks file option below.
certSign.selectKey=Select Your Private Key File (PKCS#8 format, could be .pem or .der):
certSign.selectCert=Select Your Certificate File (X.509 format, could be .pem or .der):
certSign.selectP12=Select Your PKCS#12 Keystore File (.p12 or .pfx) (Optional, If provided, it should contain your private key and certificate):
certSign.selectJKS=Select Your Java Keystore File (.jks or .keystore):
certSign.certType=Certificate Type
certSign.password=Enter Your Keystore or Private Key Password (If Any):
certSign.showSig=Show Signature

View File

@ -1,135 +1,113 @@
<!DOCTYPE html>
<html th:lang="${#locale.toString()}"
th:lang-direction="#{language.direction}"
xmlns:th="http://www.thymeleaf.org">
<th:block
th:insert="~{fragments/common :: head(title=#{certSign.title}, header=#{certSign.header})}"></th:block>
<html th:lang="${#locale.toString()}" th:lang-direction="#{language.direction}" xmlns:th="http://www.thymeleaf.org">
<th:block th:insert="~{fragments/common :: head(title=#{certSign.title}, header=#{certSign.header})}"></th:block>
<body>
<div id="page-container">
<div id="content-wrap">
<div th:insert="~{fragments/navbar.html :: navbar}"></div>
<br> <br>
<div class="container">
<div class="row justify-content-center">
<div class="col-md-6">
<h2 th:text="#{certSign.header}"></h2>
<form action="api/v1/security/cert-sign" method="post"
enctype="multipart/form-data">
<div class="mb-3">
<label th:text="#{certSign.selectPDF}"></label>
<div
th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
</div>
<div class="mb-3">
<label for="certType" th:text="#{certSign.certType}"></label> <select
class="form-control" id="certType" name="certType">
<option value="" th:text="#{selectFillter}"></option>
<option value="PKCS12">PKCS12</option>
<option value="PEM">PEM</option>
</select>
<div id="page-container">
<div id="content-wrap">
<div th:insert="~{fragments/navbar.html :: navbar}"></div>
<br> <br>
<div class="container">
<div class="row justify-content-center">
<div class="col-md-6">
<h2 th:text="#{certSign.header}"></h2>
<form action="api/v1/security/cert-sign" method="post" enctype="multipart/form-data">
<div class="mb-3">
<label th:text="#{certSign.selectPDF}"></label>
<div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
</div>
<!-- Tell users to use keytool to generate JKS for other formats -->
<div class="mb-3">
<label th:text="#{certSign.jksNote}"></label>
</div>
<div class="mb-3">
<label for="certType" th:text="#{certSign.certType}"></label> <select class="form-control" id="certType" name="certType">
<option value="" th:text="#{selectFillter}"></option>
<option value="PEM">PEM</option>
<option value="PKCS12">PKCS12</option>
<option value="JKS">JKS</option>
</select>
</div>
<div id="pemGroup" style="display: none;">
<div class="mb-3">
<label th:text="#{certSign.selectKey}"></label>
<div th:replace="~{fragments/common :: fileSelector(name='privateKeyFile', multiple=false, notRequired=true, accept='.pem,.der')}"></div>
</div>
<div class="mb-3">
<label th:text="#{certSign.selectCert}"></label>
<div th:replace="~{fragments/common :: fileSelector(name='certFile', multiple=false, notRequired=true, accept='.pem,.der')}"></div>
</div>
</div>
<div class="mb-3" id="p12Group" style="display: none;">
<label th:text="#{certSign.selectP12}"></label>
<div th:replace="~{fragments/common :: fileSelector(name='p12File', notRequired=true, multiple=false, accept='.p12,.pfx')}"></div>
</div>
<div class="mb-3" id="jksGroup" style="display: none;">
<label th:text="#{certSign.selectJKS}"></label>
<div th:replace="~{fragments/common :: fileSelector(name='jksFile', notRequired=true, multiple=false, accept='.jks,.keystore')}"></div>
</div>
<div class="mb-3">
<label th:text="#{certSign.password}"></label> <input type="password" class="form-control" id="password" name="password">
</div>
<div class="mb-3">
<label><input type="checkbox" id="showSignature" name="showSignature" th:text="#{certSign.showSig}"></label>
</div>
<div id="signatureDetails" style="display: none;">
<div class="mb-3">
<label for="reason" th:text="#{certSign.reason}"></label> <input type="text" class="form-control" id="reason" name="reason">
</div>
<div class="mb-3">
<label for="location" th:text="#{certSign.location}"></label> <input type="text" class="form-control" id="location" name="location">
</div>
<div class="mb-3">
<label for="name" th:text="#{certSign.name}"></label> <input type="text" class="form-control" id="name" name="name">
</div>
<div class="mb-3">
<label for="pageNumber" th:text="#{pageNum}"></label> <input type="number" class="form-control" id="pageNumber" name="pageNumber" min="1" disabled>
</div>
</div>
<div class="mb-3 text-center">
<button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{certSign.submit}"></button>
</div>
</form>
</div>
</div>
</div>
</div>
<div th:insert="~{fragments/footer.html :: footer}"></div>
</div>
<script type="text/javascript">
document
.getElementById('certType')
.addEventListener(
'change',
function() {
var pemGroup = document.getElementById('pemGroup');
var p12Group = document.getElementById('p12Group');
var jksGroup = document.getElementById('jksGroup');
var valueToGroupMap = {
'PEM': pemGroup,
'PKCS12': p12Group,
'JKS': jksGroup
};
for (var key in valueToGroupMap) {
valueToGroupMap[key].style.display = (this.value === key) ? 'block' : 'none';
}
});
<div class="mb-3" id="p12Group" style="display: none;">
<label th:text="#{certSign.selectP12}"></label>
<div
th:replace="~{fragments/common :: fileSelector(name='p12File', notRequired=true, multiple=false, accept='.p12,.pfx')}"></div>
</div>
<div id="pemGroup" style="display: none;">
<div class="mb-3">
<label th:text="#{certSign.selectKey}"></label>
<div
th:replace="~{fragments/common :: fileSelector(name='privateKeyFile', multiple=false, notRequired=true, accept='.pem,.der')}"></div>
</div>
<div class="mb-3">
<label th:text="#{certSign.selectCert}"></label>
<div
th:replace="~{fragments/common :: fileSelector(name='certFile', multiple=false, notRequired=true, accept='.pem,.der')}"></div>
</div>
</div>
<div class="mb-3">
<label th:text="#{certSign.password}"></label> <input
type="password" class="form-control" id="password"
name="password">
</div>
<div class="mb-3">
<label><input type="checkbox" id="showSignature"
name="showSignature" th:text="#{certSign.showSig}"></label>
</div>
<div id="signatureDetails" style="display: none;">
<div class="mb-3">
<label for="reason" th:text="#{certSign.reason}"></label> <input type="text"
class="form-control" id="reason" name="reason">
</div>
<div class="mb-3">
<label for="location" th:text="#{certSign.location}"></label> <input type="text"
class="form-control" id="location" name="location">
</div>
<div class="mb-3">
<label for="name" th:text="#{certSign.name}"></label> <input type="text"
class="form-control" id="name" name="name">
</div>
<div class="mb-3">
<label for="pageNumber" th:text="#{pageNum}"></label> <input
type="number" class="form-control" id="pageNumber"
name="pageNumber" min="1">
</div>
</div>
<script type="text/javascript">
document
.getElementById('certType')
.addEventListener(
'change',
function() {
var p12Group = document
.getElementById('p12Group');
var pemGroup = document
.getElementById('pemGroup');
if (this.value === 'PKCS12') {
p12Group.style.display = 'block';
pemGroup.style.display = 'none';
} else if (this.value === 'PEM') {
p12Group.style.display = 'none';
pemGroup.style.display = 'block';
} else {
p12Group.style.display = 'none';
pemGroup.style.display = 'none';
}
});
document
.getElementById('showSignature')
.addEventListener(
'change',
function() {
var signatureDetails = document
.getElementById('signatureDetails');
if (this.checked) {
signatureDetails.style.display = 'block';
} else {
signatureDetails.style.display = 'none';
}
});
</script>
<div class="mb-3 text-center">
<button type="submit" id="submitBtn" class="btn btn-primary"
th:text="#{certSign.submit}"></button>
</div>
</form>
</div>
</div>
</div>
</div>
<div th:insert="~{fragments/footer.html :: footer}"></div>
</div>
document
.getElementById('showSignature')
.addEventListener(
'change',
function() {
var signatureDetails = document.getElementById('signatureDetails');
if (this.checked) {
signatureDetails.style.display = 'block';
} else {
signatureDetails.style.display = 'none';
}
});
</script>
</body>
</html>