627 lines
30 KiB
Java
627 lines
30 KiB
Java
// SPDX-FileCopyrightText: 2018 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.decryption_verification;
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import java.io.BufferedInputStream;
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import java.io.EOFException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import javax.annotation.Nonnull;
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import javax.annotation.Nullable;
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import org.bouncycastle.bcpg.ArmoredInputStream;
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import org.bouncycastle.openpgp.PGPCompressedData;
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import org.bouncycastle.openpgp.PGPEncryptedData;
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import org.bouncycastle.openpgp.PGPEncryptedDataList;
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import org.bouncycastle.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPLiteralData;
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import org.bouncycastle.openpgp.PGPObjectFactory;
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import org.bouncycastle.openpgp.PGPOnePassSignature;
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import org.bouncycastle.openpgp.PGPOnePassSignatureList;
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import org.bouncycastle.openpgp.PGPPBEEncryptedData;
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import org.bouncycastle.openpgp.PGPPrivateKey;
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import org.bouncycastle.openpgp.PGPPublicKey;
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import org.bouncycastle.openpgp.PGPPublicKeyEncryptedData;
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import org.bouncycastle.openpgp.PGPPublicKeyRing;
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import org.bouncycastle.openpgp.PGPSecretKey;
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import org.bouncycastle.openpgp.PGPSecretKeyRing;
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import org.bouncycastle.openpgp.PGPSessionKey;
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import org.bouncycastle.openpgp.PGPSignature;
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import org.bouncycastle.openpgp.PGPUtil;
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import org.bouncycastle.openpgp.operator.PBEDataDecryptorFactory;
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import org.bouncycastle.openpgp.operator.PGPContentVerifierBuilderProvider;
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import org.bouncycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
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import org.bouncycastle.openpgp.operator.SessionKeyDataDecryptorFactory;
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import org.pgpainless.PGPainless;
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import org.pgpainless.algorithm.CompressionAlgorithm;
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import org.pgpainless.algorithm.EncryptionPurpose;
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import org.pgpainless.algorithm.StreamEncoding;
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import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
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import org.pgpainless.exception.MessageNotIntegrityProtectedException;
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import org.pgpainless.exception.MissingDecryptionMethodException;
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import org.pgpainless.exception.MissingLiteralDataException;
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import org.pgpainless.exception.MissingPassphraseException;
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import org.pgpainless.exception.SignatureValidationException;
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import org.pgpainless.exception.UnacceptableAlgorithmException;
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import org.pgpainless.exception.WrongConsumingMethodException;
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import org.pgpainless.implementation.ImplementationFactory;
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import org.pgpainless.key.SubkeyIdentifier;
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import org.pgpainless.key.info.KeyRingInfo;
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import org.pgpainless.key.protection.SecretKeyRingProtector;
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import org.pgpainless.key.protection.UnlockSecretKey;
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import org.pgpainless.signature.SignatureUtils;
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import org.pgpainless.signature.consumer.DetachedSignatureCheck;
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import org.pgpainless.signature.consumer.OnePassSignatureCheck;
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import org.pgpainless.util.CRCingArmoredInputStreamWrapper;
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import org.pgpainless.util.PGPUtilWrapper;
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import org.pgpainless.util.Passphrase;
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import org.pgpainless.util.SessionKey;
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import org.pgpainless.util.Tuple;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public final class DecryptionStreamFactory {
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private static final Logger LOGGER = LoggerFactory.getLogger(DecryptionStreamFactory.class);
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// Maximum nesting depth of packets (e.g. compression, encryption...)
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private static final int MAX_PACKET_NESTING_DEPTH = 16;
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private final ConsumerOptions options;
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private final OpenPgpMetadata.Builder resultBuilder = OpenPgpMetadata.getBuilder();
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private final List<OnePassSignatureCheck> onePassSignatureChecks = new ArrayList<>();
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private final List<DetachedSignatureCheck> detachedSignatureChecks = new ArrayList<>();
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private final Map<Long, OnePassSignatureCheck> onePassSignaturesWithMissingCert = new HashMap<>();
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private static final PGPContentVerifierBuilderProvider verifierBuilderProvider =
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ImplementationFactory.getInstance().getPGPContentVerifierBuilderProvider();
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private IntegrityProtectedInputStream integrityProtectedEncryptedInputStream;
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public static DecryptionStream create(@Nonnull InputStream inputStream,
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@Nonnull ConsumerOptions options)
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throws PGPException, IOException {
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DecryptionStreamFactory factory = new DecryptionStreamFactory(options);
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return factory.parseOpenPGPDataAndCreateDecryptionStream(inputStream);
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}
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public DecryptionStreamFactory(ConsumerOptions options) {
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this.options = options;
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initializeDetachedSignatures(options.getDetachedSignatures());
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}
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private void initializeDetachedSignatures(Set<PGPSignature> signatures) {
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for (PGPSignature signature : signatures) {
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long issuerKeyId = SignatureUtils.determineIssuerKeyId(signature);
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PGPPublicKeyRing signingKeyRing = findSignatureVerificationKeyRing(issuerKeyId);
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if (signingKeyRing == null) {
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SignatureValidationException ex = new SignatureValidationException(
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"Missing verification certificate " + Long.toHexString(issuerKeyId));
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resultBuilder.addInvalidDetachedSignature(new SignatureVerification(signature, null), ex);
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continue;
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}
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PGPPublicKey signingKey = signingKeyRing.getPublicKey(issuerKeyId);
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SubkeyIdentifier signingKeyIdentifier = new SubkeyIdentifier(signingKeyRing, signingKey.getKeyID());
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try {
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signature.init(verifierBuilderProvider, signingKey);
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DetachedSignatureCheck detachedSignature =
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new DetachedSignatureCheck(signature, signingKeyRing, signingKeyIdentifier);
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detachedSignatureChecks.add(detachedSignature);
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} catch (PGPException e) {
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SignatureValidationException ex = new SignatureValidationException(
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"Cannot verify detached signature made by " + signingKeyIdentifier + ".", e);
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resultBuilder.addInvalidDetachedSignature(new SignatureVerification(signature, signingKeyIdentifier), ex);
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}
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}
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}
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private DecryptionStream parseOpenPGPDataAndCreateDecryptionStream(InputStream inputStream)
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throws IOException, PGPException {
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// Make sure we handle armored and non-armored data properly
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BufferedInputStream bufferedIn = new BufferedInputStream(inputStream, 512);
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bufferedIn.mark(512);
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InputStream decoderStream;
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PGPObjectFactory objectFactory;
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if (options.isCleartextSigned()) {
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inputStream = wrapInVerifySignatureStream(bufferedIn, null);
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return new DecryptionStream(inputStream, resultBuilder, integrityProtectedEncryptedInputStream,
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null);
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}
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try {
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decoderStream = PGPUtilWrapper.getDecoderStream(bufferedIn);
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decoderStream = CRCingArmoredInputStreamWrapper.possiblyWrap(decoderStream);
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if (decoderStream instanceof ArmoredInputStream) {
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ArmoredInputStream armor = (ArmoredInputStream) decoderStream;
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if (armor.isClearText()) {
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throw new WrongConsumingMethodException("Message appears to be using the Cleartext Signature Framework. " +
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"Use PGPainless.verifyCleartextSignedMessage() to verify this message instead.");
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}
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}
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objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(decoderStream);
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// Parse OpenPGP message
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inputStream = processPGPPackets(objectFactory, 1);
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} catch (EOFException e) {
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throw e;
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} catch (MissingLiteralDataException e) {
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// Not an OpenPGP message.
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// Reset the buffered stream to parse the message as arbitrary binary data
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// to allow for detached signature verification.
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LOGGER.debug("The message appears to not be an OpenPGP message. This is probably data signed with detached signatures?");
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bufferedIn.reset();
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decoderStream = bufferedIn;
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objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(decoderStream);
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inputStream = wrapInVerifySignatureStream(bufferedIn, objectFactory);
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} catch (IOException e) {
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if (e.getMessage().contains("invalid armor") || e.getMessage().contains("invalid header encountered")) {
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// We falsely assumed the data to be armored.
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LOGGER.debug("The message is apparently not armored.");
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bufferedIn.reset();
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decoderStream = bufferedIn;
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objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(decoderStream);
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inputStream = wrapInVerifySignatureStream(bufferedIn, objectFactory);
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} else {
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throw e;
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}
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}
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return new DecryptionStream(inputStream, resultBuilder, integrityProtectedEncryptedInputStream,
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(decoderStream instanceof ArmoredInputStream) ? decoderStream : null);
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}
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private InputStream wrapInVerifySignatureStream(InputStream bufferedIn, @Nullable PGPObjectFactory objectFactory) {
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return new SignatureInputStream.VerifySignatures(
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bufferedIn, objectFactory, onePassSignatureChecks,
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onePassSignaturesWithMissingCert, detachedSignatureChecks, options,
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resultBuilder);
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}
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private InputStream processPGPPackets(@Nonnull PGPObjectFactory objectFactory, int depth)
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throws IOException, PGPException {
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if (depth >= MAX_PACKET_NESTING_DEPTH) {
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throw new PGPException("Maximum depth of nested packages exceeded.");
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}
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Object nextPgpObject;
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while ((nextPgpObject = objectFactory.nextObject()) != null) {
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if (nextPgpObject instanceof PGPEncryptedDataList) {
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return processPGPEncryptedDataList((PGPEncryptedDataList) nextPgpObject, depth);
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}
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if (nextPgpObject instanceof PGPCompressedData) {
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return processPGPCompressedData((PGPCompressedData) nextPgpObject, depth);
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}
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if (nextPgpObject instanceof PGPOnePassSignatureList) {
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return processOnePassSignatureList(objectFactory, (PGPOnePassSignatureList) nextPgpObject, depth);
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}
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if (nextPgpObject instanceof PGPLiteralData) {
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return processPGPLiteralData(objectFactory, (PGPLiteralData) nextPgpObject, depth);
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}
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}
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throw new MissingLiteralDataException("No Literal Data Packet found");
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}
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private InputStream processPGPEncryptedDataList(PGPEncryptedDataList pgpEncryptedDataList, int depth)
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throws PGPException, IOException {
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LOGGER.debug("Depth {}: Encountered PGPEncryptedDataList", depth);
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SessionKey sessionKey = options.getSessionKey();
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if (sessionKey != null) {
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integrityProtectedEncryptedInputStream = decryptWithProvidedSessionKey(pgpEncryptedDataList, sessionKey);
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InputStream decodedDataStream = PGPUtil.getDecoderStream(integrityProtectedEncryptedInputStream);
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PGPObjectFactory factory = ImplementationFactory.getInstance().getPGPObjectFactory(decodedDataStream);
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return processPGPPackets(factory, ++depth);
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}
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InputStream decryptedDataStream = decryptSessionKey(pgpEncryptedDataList);
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InputStream decodedDataStream = PGPUtil.getDecoderStream(decryptedDataStream);
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PGPObjectFactory factory = ImplementationFactory.getInstance().getPGPObjectFactory(decodedDataStream);
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return processPGPPackets(factory, ++depth);
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}
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private IntegrityProtectedInputStream decryptWithProvidedSessionKey(
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PGPEncryptedDataList pgpEncryptedDataList,
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SessionKey sessionKey)
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throws PGPException {
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PGPSessionKey pgpSessionKey = new PGPSessionKey(sessionKey.getAlgorithm().getAlgorithmId(), sessionKey.getKey());
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SessionKeyDataDecryptorFactory decryptorFactory =
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ImplementationFactory.getInstance().provideSessionKeyDataDecryptorFactory(pgpSessionKey);
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InputStream decryptedDataStream = null;
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PGPEncryptedData encryptedData = null;
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for (PGPEncryptedData pgpEncryptedData : pgpEncryptedDataList) {
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encryptedData = pgpEncryptedData;
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if (!options.isIgnoreMDCErrors() && !encryptedData.isIntegrityProtected()) {
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throw new MessageNotIntegrityProtectedException();
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}
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if (encryptedData instanceof PGPPBEEncryptedData) {
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PGPPBEEncryptedData pbeEncrypted = (PGPPBEEncryptedData) encryptedData;
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decryptedDataStream = pbeEncrypted.getDataStream(decryptorFactory);
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break;
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} else if (encryptedData instanceof PGPPublicKeyEncryptedData) {
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PGPPublicKeyEncryptedData pkEncrypted = (PGPPublicKeyEncryptedData) encryptedData;
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decryptedDataStream = pkEncrypted.getDataStream(decryptorFactory);
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break;
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}
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}
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if (decryptedDataStream == null) {
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throw new PGPException("No valid PGP data encountered.");
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}
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resultBuilder.setSessionKey(sessionKey);
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throwIfAlgorithmIsRejected(sessionKey.getAlgorithm());
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integrityProtectedEncryptedInputStream =
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new IntegrityProtectedInputStream(decryptedDataStream, encryptedData, options);
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return integrityProtectedEncryptedInputStream;
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}
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private InputStream processPGPCompressedData(PGPCompressedData pgpCompressedData, int depth)
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throws PGPException, IOException {
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CompressionAlgorithm compressionAlgorithm = CompressionAlgorithm.fromId(pgpCompressedData.getAlgorithm());
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LOGGER.debug("Depth {}: Encountered PGPCompressedData: {}", depth, compressionAlgorithm);
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resultBuilder.setCompressionAlgorithm(compressionAlgorithm);
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InputStream inflatedDataStream = pgpCompressedData.getDataStream();
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InputStream decodedDataStream = PGPUtil.getDecoderStream(inflatedDataStream);
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PGPObjectFactory objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(decodedDataStream);
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return processPGPPackets(objectFactory, ++depth);
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}
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private InputStream processOnePassSignatureList(
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@Nonnull PGPObjectFactory objectFactory,
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PGPOnePassSignatureList onePassSignatures,
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int depth)
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throws PGPException, IOException {
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LOGGER.debug("Depth {}: Encountered PGPOnePassSignatureList of size {}", depth, onePassSignatures.size());
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initOnePassSignatures(onePassSignatures);
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return processPGPPackets(objectFactory, depth);
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}
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private InputStream processPGPLiteralData(
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@Nonnull PGPObjectFactory objectFactory,
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PGPLiteralData pgpLiteralData,
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int depth) {
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LOGGER.debug("Depth {}: Found PGPLiteralData", depth);
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InputStream literalDataInputStream = pgpLiteralData.getInputStream();
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resultBuilder.setFileName(pgpLiteralData.getFileName())
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.setModificationDate(pgpLiteralData.getModificationTime())
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.setFileEncoding(StreamEncoding.fromCode(pgpLiteralData.getFormat()));
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if (onePassSignatureChecks.isEmpty() && onePassSignaturesWithMissingCert.isEmpty()) {
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LOGGER.debug("No OnePassSignatures found -> We are done");
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return literalDataInputStream;
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}
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return new SignatureInputStream.VerifySignatures(literalDataInputStream, objectFactory,
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onePassSignatureChecks, onePassSignaturesWithMissingCert, detachedSignatureChecks, options, resultBuilder) {
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};
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}
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private InputStream decryptSessionKey(@Nonnull PGPEncryptedDataList encryptedDataList)
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throws PGPException {
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Iterator<PGPEncryptedData> encryptedDataIterator = encryptedDataList.getEncryptedDataObjects();
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if (!encryptedDataIterator.hasNext()) {
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throw new PGPException("Decryption failed - EncryptedDataList has no items");
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}
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PGPPrivateKey decryptionKey = null;
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PGPPublicKeyEncryptedData encryptedSessionKey = null;
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List<PGPPBEEncryptedData> passphraseProtected = new ArrayList<>();
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List<PGPPublicKeyEncryptedData> publicKeyProtected = new ArrayList<>();
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List<Tuple<SubkeyIdentifier, PGPPublicKeyEncryptedData>> postponedDueToMissingPassphrase = new ArrayList<>();
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// Sort PKESK and SKESK packets
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while (encryptedDataIterator.hasNext()) {
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PGPEncryptedData encryptedData = encryptedDataIterator.next();
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if (!encryptedData.isIntegrityProtected() && !options.isIgnoreMDCErrors()) {
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throw new MessageNotIntegrityProtectedException();
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}
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// SKESK
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if (encryptedData instanceof PGPPBEEncryptedData) {
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passphraseProtected.add((PGPPBEEncryptedData) encryptedData);
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}
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// PKESK
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else if (encryptedData instanceof PGPPublicKeyEncryptedData) {
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publicKeyProtected.add((PGPPublicKeyEncryptedData) encryptedData);
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}
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}
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// Try decryption with passphrases first
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for (PGPPBEEncryptedData pbeEncryptedData : passphraseProtected) {
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for (Passphrase passphrase : options.getDecryptionPassphrases()) {
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PBEDataDecryptorFactory passphraseDecryptor = ImplementationFactory.getInstance()
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.getPBEDataDecryptorFactory(passphrase);
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try {
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InputStream decryptedDataStream = pbeEncryptedData.getDataStream(passphraseDecryptor);
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PGPSessionKey pgpSessionKey = pbeEncryptedData.getSessionKey(passphraseDecryptor);
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SessionKey sessionKey = new SessionKey(pgpSessionKey);
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resultBuilder.setSessionKey(sessionKey);
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throwIfAlgorithmIsRejected(sessionKey.getAlgorithm());
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integrityProtectedEncryptedInputStream =
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new IntegrityProtectedInputStream(decryptedDataStream, pbeEncryptedData, options);
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return integrityProtectedEncryptedInputStream;
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} catch (PGPException e) {
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LOGGER.debug("Probable passphrase mismatch, skip PBE encrypted data block", e);
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}
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}
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}
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// Then try decryption with public key encryption
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for (PGPPublicKeyEncryptedData publicKeyEncryptedData : publicKeyProtected) {
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PGPPrivateKey privateKey = null;
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if (options.getDecryptionKeys().isEmpty()) {
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break;
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}
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long keyId = publicKeyEncryptedData.getKeyID();
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// Wildcard KeyID
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if (keyId == 0L) {
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LOGGER.debug("Hidden recipient detected. Try to decrypt with all available secret keys.");
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for (PGPSecretKeyRing secretKeys : options.getDecryptionKeys()) {
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if (privateKey != null) {
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break;
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}
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KeyRingInfo info = new KeyRingInfo(secretKeys);
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List<PGPPublicKey> encryptionSubkeys = info.getEncryptionSubkeys(EncryptionPurpose.ANY);
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for (PGPPublicKey pubkey : encryptionSubkeys) {
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PGPSecretKey secretKey = secretKeys.getSecretKey(pubkey.getKeyID());
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// Skip missing secret key
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if (secretKey == null) {
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continue;
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}
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privateKey = tryPublicKeyDecryption(secretKeys, secretKey, publicKeyEncryptedData,
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postponedDueToMissingPassphrase, true);
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}
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}
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}
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// Non-wildcard key-id
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else {
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LOGGER.debug("PGPEncryptedData is encrypted for key {}", Long.toHexString(keyId));
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resultBuilder.addRecipientKeyId(keyId);
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PGPSecretKeyRing secretKeys = findDecryptionKeyRing(keyId);
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if (secretKeys == null) {
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LOGGER.debug("Missing certificate of {}. Skip.", Long.toHexString(keyId));
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continue;
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}
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// Make sure that the recipient key is encryption capable and non-expired
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KeyRingInfo info = new KeyRingInfo(secretKeys);
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List<PGPPublicKey> encryptionSubkeys = info.getEncryptionSubkeys(EncryptionPurpose.ANY);
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PGPSecretKey secretKey = null;
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for (PGPPublicKey pubkey : encryptionSubkeys) {
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if (pubkey.getKeyID() == keyId) {
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secretKey = secretKeys.getSecretKey(keyId);
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break;
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}
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}
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if (secretKey == null) {
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LOGGER.debug("Key " + Long.toHexString(keyId) + " is not valid or not capable for decryption.");
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} else {
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privateKey = tryPublicKeyDecryption(secretKeys, secretKey, publicKeyEncryptedData,
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postponedDueToMissingPassphrase, true);
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}
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}
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if (privateKey == null) {
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continue;
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}
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decryptionKey = privateKey;
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encryptedSessionKey = publicKeyEncryptedData;
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break;
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}
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// Try postponed keys with missing passphrases (will cause missing passphrase callbacks to fire)
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if (encryptedSessionKey == null) {
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if (options.getMissingKeyPassphraseStrategy() == MissingKeyPassphraseStrategy.THROW_EXCEPTION) {
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// Non-interactive mode: Throw an exception with all locked decryption keys
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Set<SubkeyIdentifier> keyIds = new HashSet<>();
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for (Tuple<SubkeyIdentifier, ?> k : postponedDueToMissingPassphrase) {
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keyIds.add(k.getA());
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}
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if (!keyIds.isEmpty()) {
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throw new MissingPassphraseException(keyIds);
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}
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}
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else if (options.getMissingKeyPassphraseStrategy() == MissingKeyPassphraseStrategy.INTERACTIVE) {
|
|
// Interactive mode: Fire protector callbacks to get passphrases interactively
|
|
for (Tuple<SubkeyIdentifier, PGPPublicKeyEncryptedData> missingPassphrases : postponedDueToMissingPassphrase) {
|
|
SubkeyIdentifier keyId = missingPassphrases.getA();
|
|
PGPPublicKeyEncryptedData publicKeyEncryptedData = missingPassphrases.getB();
|
|
PGPSecretKeyRing secretKeys = findDecryptionKeyRing(keyId.getKeyId());
|
|
PGPSecretKey secretKey = secretKeys.getSecretKey(keyId.getSubkeyId());
|
|
|
|
PGPPrivateKey privateKey = tryPublicKeyDecryption(secretKeys, secretKey, publicKeyEncryptedData,
|
|
postponedDueToMissingPassphrase, false);
|
|
if (privateKey == null) {
|
|
continue;
|
|
}
|
|
|
|
decryptionKey = privateKey;
|
|
encryptedSessionKey = publicKeyEncryptedData;
|
|
break;
|
|
}
|
|
} else {
|
|
throw new IllegalStateException("Invalid PostponedKeysStrategy set in consumer options.");
|
|
}
|
|
|
|
}
|
|
|
|
return decryptWith(encryptedSessionKey, decryptionKey);
|
|
}
|
|
|
|
/**
|
|
* Try decryption of the provided public-key-encrypted-data using the given secret key.
|
|
* If the secret key is encrypted and the secret key protector does not have a passphrase available and the boolean
|
|
* postponeIfMissingPassphrase is true, data decryption is postponed by pushing a tuple of the encrypted data decryption key
|
|
* identifier to the postponed list.
|
|
*
|
|
* This method only returns a non-null private key, if the private key is able to decrypt the message successfully.
|
|
*
|
|
* @param secretKeys secret key ring
|
|
* @param secretKey secret key
|
|
* @param publicKeyEncryptedData encrypted data which is tried to decrypt using the secret key
|
|
* @param postponed list of postponed decryptions due to missing secret key passphrases
|
|
* @param postponeIfMissingPassphrase flag to specify whether missing secret key passphrases should result in postponed decryption
|
|
* @return private key if decryption is successful, null if decryption is unsuccessful or postponed
|
|
*
|
|
* @throws PGPException in case of an OpenPGP error
|
|
*/
|
|
private PGPPrivateKey tryPublicKeyDecryption(
|
|
PGPSecretKeyRing secretKeys,
|
|
PGPSecretKey secretKey,
|
|
PGPPublicKeyEncryptedData publicKeyEncryptedData,
|
|
List<Tuple<SubkeyIdentifier, PGPPublicKeyEncryptedData>> postponed,
|
|
boolean postponeIfMissingPassphrase) throws PGPException {
|
|
SecretKeyRingProtector protector = options.getSecretKeyProtector(secretKeys);
|
|
|
|
if (postponeIfMissingPassphrase && !protector.hasPassphraseFor(secretKey.getKeyID())) {
|
|
// Postpone decryption with key with missing passphrase
|
|
SubkeyIdentifier identifier = new SubkeyIdentifier(secretKeys, secretKey.getKeyID());
|
|
postponed.add(new Tuple<>(identifier, publicKeyEncryptedData));
|
|
return null;
|
|
}
|
|
|
|
PGPPrivateKey privateKey = UnlockSecretKey.unlockSecretKey(
|
|
secretKey, protector.getDecryptor(secretKey.getKeyID()));
|
|
|
|
// test if we have the right private key
|
|
PublicKeyDataDecryptorFactory decryptorFactory = ImplementationFactory.getInstance()
|
|
.getPublicKeyDataDecryptorFactory(privateKey);
|
|
try {
|
|
publicKeyEncryptedData.getSymmetricAlgorithm(decryptorFactory); // will only succeed if we have the right secret key
|
|
LOGGER.debug("Found correct decryption key {}.", Long.toHexString(secretKey.getKeyID()));
|
|
resultBuilder.setDecryptionKey(new SubkeyIdentifier(secretKeys, privateKey.getKeyID()));
|
|
return privateKey;
|
|
} catch (PGPException | ClassCastException e) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
private InputStream decryptWith(PGPPublicKeyEncryptedData encryptedSessionKey, PGPPrivateKey decryptionKey)
|
|
throws PGPException {
|
|
if (decryptionKey == null || encryptedSessionKey == null) {
|
|
throw new MissingDecryptionMethodException("Decryption failed - No suitable decryption key or passphrase found");
|
|
}
|
|
|
|
PublicKeyDataDecryptorFactory dataDecryptor = ImplementationFactory.getInstance()
|
|
.getPublicKeyDataDecryptorFactory(decryptionKey);
|
|
|
|
PGPSessionKey pgpSessionKey = encryptedSessionKey.getSessionKey(dataDecryptor);
|
|
SessionKey sessionKey = new SessionKey(pgpSessionKey);
|
|
resultBuilder.setSessionKey(sessionKey);
|
|
|
|
SymmetricKeyAlgorithm symmetricKeyAlgorithm = sessionKey.getAlgorithm();
|
|
if (symmetricKeyAlgorithm == SymmetricKeyAlgorithm.NULL) {
|
|
LOGGER.debug("Message is unencrypted");
|
|
} else {
|
|
LOGGER.debug("Message is encrypted using {}", symmetricKeyAlgorithm);
|
|
}
|
|
throwIfAlgorithmIsRejected(symmetricKeyAlgorithm);
|
|
|
|
integrityProtectedEncryptedInputStream = new IntegrityProtectedInputStream(
|
|
encryptedSessionKey.getDataStream(dataDecryptor), encryptedSessionKey, options);
|
|
return integrityProtectedEncryptedInputStream;
|
|
}
|
|
|
|
private void throwIfAlgorithmIsRejected(SymmetricKeyAlgorithm algorithm)
|
|
throws UnacceptableAlgorithmException {
|
|
if (!PGPainless.getPolicy().getSymmetricKeyDecryptionAlgorithmPolicy().isAcceptable(algorithm)) {
|
|
throw new UnacceptableAlgorithmException("Data is "
|
|
+ (algorithm == SymmetricKeyAlgorithm.NULL ?
|
|
"unencrypted" :
|
|
"encrypted with symmetric algorithm " + algorithm) + " which is not acceptable as per PGPainless' policy.\n" +
|
|
"To mark this algorithm as acceptable, use PGPainless.getPolicy().setSymmetricKeyDecryptionAlgorithmPolicy().");
|
|
}
|
|
}
|
|
|
|
private void initOnePassSignatures(@Nonnull PGPOnePassSignatureList onePassSignatureList)
|
|
throws PGPException {
|
|
Iterator<PGPOnePassSignature> iterator = onePassSignatureList.iterator();
|
|
if (!iterator.hasNext()) {
|
|
throw new PGPException("Verification failed - No OnePassSignatures found");
|
|
}
|
|
|
|
processOnePassSignatures(iterator);
|
|
}
|
|
|
|
private void processOnePassSignatures(Iterator<PGPOnePassSignature> signatures)
|
|
throws PGPException {
|
|
while (signatures.hasNext()) {
|
|
PGPOnePassSignature signature = signatures.next();
|
|
processOnePassSignature(signature);
|
|
}
|
|
}
|
|
|
|
private void processOnePassSignature(PGPOnePassSignature signature)
|
|
throws PGPException {
|
|
final long keyId = signature.getKeyID();
|
|
|
|
LOGGER.debug("Encountered OnePassSignature from {}", Long.toHexString(keyId));
|
|
|
|
// Find public key
|
|
PGPPublicKeyRing verificationKeyRing = findSignatureVerificationKeyRing(keyId);
|
|
if (verificationKeyRing == null) {
|
|
onePassSignaturesWithMissingCert.put(keyId, new OnePassSignatureCheck(signature, null));
|
|
return;
|
|
}
|
|
PGPPublicKey verificationKey = verificationKeyRing.getPublicKey(keyId);
|
|
|
|
signature.init(verifierBuilderProvider, verificationKey);
|
|
OnePassSignatureCheck onePassSignature = new OnePassSignatureCheck(signature, verificationKeyRing);
|
|
onePassSignatureChecks.add(onePassSignature);
|
|
}
|
|
|
|
private PGPSecretKeyRing findDecryptionKeyRing(long keyId) {
|
|
for (PGPSecretKeyRing key : options.getDecryptionKeys()) {
|
|
if (key.getSecretKey(keyId) != null) {
|
|
return key;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
private PGPPublicKeyRing findSignatureVerificationKeyRing(long keyId) {
|
|
PGPPublicKeyRing verificationKeyRing = null;
|
|
for (PGPPublicKeyRing publicKeyRing : options.getCertificates()) {
|
|
PGPPublicKey verificationKey = publicKeyRing.getPublicKey(keyId);
|
|
if (verificationKey != null) {
|
|
LOGGER.debug("Found public key {} for signature verification", Long.toHexString(keyId));
|
|
verificationKeyRing = publicKeyRing;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (verificationKeyRing == null && options.getMissingCertificateCallback() != null) {
|
|
verificationKeyRing = options.getMissingCertificateCallback().onMissingPublicKeyEncountered(keyId);
|
|
}
|
|
|
|
return verificationKeyRing;
|
|
}
|
|
}
|