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bndlib: A Swiss Army Knife for OSGi
package aQute.bnd.signing;
import static java.nio.charset.StandardCharsets.UTF_8;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.security.KeyStore;
import java.security.KeyStore.PrivateKeyEntry;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Signature;
import java.util.Map;
import java.util.jar.Manifest;
import java.util.regex.Pattern;
import aQute.bnd.osgi.EmbeddedResource;
import aQute.bnd.osgi.Jar;
import aQute.bnd.osgi.Processor;
import aQute.bnd.osgi.Resource;
import aQute.lib.base64.Base64;
import aQute.lib.io.ByteBufferOutputStream;
import aQute.lib.io.IO;
import aQute.lib.io.IOConstants;
/**
* This class is used with the aQute.bnd.osgi package, it signs jars with DSA
* signature. -sign: md5, sha1
*/
public class Signer extends Processor {
static final int BUFFER_SIZE = IOConstants.PAGE_SIZE * 1;
private final static Pattern METAINFDIR = Pattern.compile("META-INF/[^/]*");
String digestNames[] = new String[] {
"MD5"
};
File keystoreFile = new File("keystore");
String password;
String alias;
public void signJar(Jar jar) {
if (digestNames == null || digestNames.length == 0) {
error("Need at least one digest algorithm name, none are specified");
return;
}
if (keystoreFile == null || !keystoreFile.getAbsoluteFile()
.exists()) {
error("No such keystore file: %s", keystoreFile);
return;
}
if (alias == null) {
error("Private key alias not set for signing");
return;
}
MessageDigest digestAlgorithms[] = new MessageDigest[digestNames.length];
getAlgorithms(digestNames, digestAlgorithms);
try (ByteBufferOutputStream o = new ByteBufferOutputStream()) {
Manifest manifest = jar.getManifest();
manifest.getMainAttributes()
.putValue("Signed-By", "Bnd");
// Create a new manifest that contains the
// Name parts with the specified digests
manifest.write(o);
doManifest(jar, digestNames, digestAlgorithms, o);
o.flush();
byte newManifestBytes[] = o.toByteArray();
jar.putResource("META-INF/MANIFEST.MF", new EmbeddedResource(newManifestBytes, 0L));
// Use the bytes from the new manifest to create
// a signature file
byte[] signatureFileBytes = doSignatureFile(digestNames, digestAlgorithms, newManifestBytes);
jar.putResource("META-INF/BND.SF", new EmbeddedResource(signatureFileBytes, 0L));
// Now we must create an RSA signature
// this requires the private key from the keystore
KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
KeyStore.PrivateKeyEntry privateKeyEntry = null;
try (InputStream keystoreInputStream = IO.stream(keystoreFile)) {
char[] pw = password == null ? new char[0] : password.toCharArray();
keystore.load(keystoreInputStream, pw);
keystoreInputStream.close();
privateKeyEntry = (PrivateKeyEntry) keystore.getEntry(alias, new KeyStore.PasswordProtection(pw));
} catch (Exception e) {
exception(e, "Not able to load the private key from the given keystore(%s) with alias %s",
keystoreFile.getAbsolutePath(), alias);
return;
}
PrivateKey privateKey = privateKeyEntry.getPrivateKey();
Signature signature = Signature.getInstance("MD5withRSA");
signature.initSign(privateKey);
signature.update(signatureFileBytes);
signature.sign();
// TODO, place the SF in a PCKS#7 structure ...
// no standard class for this? The following
// is an idea but we will to have do ASN.1 BER
// encoding ...
try (ByteBufferOutputStream tmpStream = new ByteBufferOutputStream()) {
jar.putResource("META-INF/BND.RSA", new EmbeddedResource(tmpStream.toByteBuffer(), 0L));
}
} catch (Exception e) {
exception(e, "During signing: %s", e);
}
}
private byte[] doSignatureFile(String[] digestNames, MessageDigest[] algorithms, byte[] manbytes)
throws IOException {
try (ByteBufferOutputStream out = new ByteBufferOutputStream(); PrintWriter ps = IO.writer(out)) {
ps.print("Signature-Version: 1.0\r\n");
for (int a = 0; a < algorithms.length; a++) {
if (algorithms[a] != null) {
byte[] digest = algorithms[a].digest(manbytes);
ps.print(digestNames[a] + "-Digest-Manifest: ");
ps.print(new Base64(digest));
ps.print("\r\n");
}
}
ps.flush();
return out.toByteArray();
}
}
private void doManifest(Jar jar, String[] digestNames, MessageDigest[] algorithms, OutputStream out)
throws Exception {
Writer w = IO.writer(out, UTF_8);
try {
for (Map.Entry entry : jar.getResources()
.entrySet()) {
String name = entry.getKey();
if (!METAINFDIR.matcher(name)
.matches()) {
w.write("\r\n");
w.write("Name: ");
w.write(name);
w.write("\r\n");
digest(algorithms, entry.getValue());
for (int a = 0; a < algorithms.length; a++) {
if (algorithms[a] != null) {
byte[] digest = algorithms[a].digest();
String header = digestNames[a] + "-Digest: " + new Base64(digest) + "\r\n";
w.write(header);
}
}
}
}
} finally {
w.flush();
}
}
private void digest(MessageDigest[] algorithms, Resource r) throws Exception {
try (InputStream in = r.openInputStream()) {
byte[] data = new byte[BUFFER_SIZE];
int size = in.read(data);
while (size > 0) {
for (MessageDigest algorithm : algorithms) {
if (algorithm != null) {
algorithm.update(data, 0, size);
}
}
size = in.read(data);
}
}
}
private void getAlgorithms(String[] digestNames, MessageDigest[] algorithms) {
for (int i = 0; i < algorithms.length; i++) {
String name = digestNames[i];
try {
algorithms[i] = MessageDigest.getInstance(name);
} catch (NoSuchAlgorithmException e) {
exception(e, "Specified digest algorithm %s, but not such algorithm was found", digestNames[i]);
}
}
}
public void setPassword(String string) {
password = string;
}
public void setKeystore(File keystore) {
this.keystoreFile = keystore;
}
public void setAlias(String string) {
this.alias = string;
}
}