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https://github.com/pgpainless/pgpainless.git
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Begin introducing new Decryption API
This commit is contained in:
parent
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commit
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GPG key ID:
62BEE9264BF17311
5 changed files with 293 additions and 63 deletions
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@ -0,0 +1,188 @@
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package org.pgpainless.decryption_verification;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.HashSet;
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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.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPPublicKeyRing;
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import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
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import org.bouncycastle.openpgp.PGPSecretKeyRing;
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import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
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import org.bouncycastle.openpgp.PGPSignature;
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import org.pgpainless.key.protection.SecretKeyRingProtector;
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import org.pgpainless.util.Passphrase;
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/**
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* Options for decryption and signature verification.
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*/
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public class ConsumerOptions {
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private Date verifyNotBefore;
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private Date verifyNotAfter;
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// Set of verification keys
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private Set<PGPPublicKeyRing> certificates = new HashSet<>();
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private Set<PGPSignature> detachedSignatures = new HashSet<>();
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private MissingPublicKeyCallback missingCertificateCallback = null;
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// Session key for decryption without passphrase/key
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private byte[] sessionKey = null;
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private final Map<PGPSecretKeyRing, SecretKeyRingProtector> decryptionKeys = new HashMap<>();
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private final Set<Passphrase> decryptionPassphrases = new HashSet<>();
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/**
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* Consider signatures made before the given timestamp invalid.
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*
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* @param timestamp timestamp
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* @return options
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*/
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public ConsumerOptions verifyNotBefore(Date timestamp) {
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this.verifyNotBefore = timestamp;
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return this;
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}
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/**
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* Consider signatures made after the given timestamp invalid.
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*
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* @param timestamp timestamp
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* @return options
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*/
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public ConsumerOptions verifyNotAfter(Date timestamp) {
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this.verifyNotAfter = timestamp;
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return this;
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}
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/**
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* Add a certificate (public key ring) for signature verification.
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*
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* @param verificationCert certificate for signature verification
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* @return options
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*/
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public ConsumerOptions addVerificationCert(PGPPublicKeyRing verificationCert) {
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this.certificates.add(verificationCert);
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return this;
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}
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/**
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* Add a set of certificates (public key rings) for signature verification.
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*
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* @param verificationCerts certificates for signature verification
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* @return options
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*/
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public ConsumerOptions addVerificationCerts(PGPPublicKeyRingCollection verificationCerts) {
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for (PGPPublicKeyRing certificate : verificationCerts) {
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addVerificationCert(certificate);
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}
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return this;
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}
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/**
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* Add a detached signature for the signature verification process.
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*
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* @param detachedSignature detached signature
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* @return options
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*/
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public ConsumerOptions addVerificationOfDetachedSignature(PGPSignature detachedSignature) {
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detachedSignatures.add(detachedSignature);
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return this;
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}
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/**
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* Set a callback that's used when a certificate (public key) is missing for signature verification.
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*
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* @param callback callback
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* @return options
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*/
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public ConsumerOptions setMissingCertificateCallback(MissingPublicKeyCallback callback) {
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this.missingCertificateCallback = callback;
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return this;
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}
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/**
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* Attempt decryption using a session key.
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*
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* Note: PGPainless does not yet support decryption with session keys.
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* TODO: Implement
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*
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* @see <a href="https://datatracker.ietf.org/doc/html/rfc4880#section-2.1">RFC4880 on Session Keys</a>
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*
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* @param sessionKey session key
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* @return options
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*/
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public ConsumerOptions setSessionKey(@Nonnull byte[] sessionKey) {
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this.sessionKey = sessionKey;
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return this;
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}
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/**
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* Add a key for message decryption.
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* The key is expected to be unencrypted.
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*
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* @param key unencrypted key
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* @return options
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*/
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public ConsumerOptions addDecryptionKey(@Nonnull PGPSecretKeyRing key) {
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return addDecryptionKey(key, SecretKeyRingProtector.unprotectedKeys());
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}
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/**
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* Add a key for message decryption. If the key is encrypted, the {@link SecretKeyRingProtector} is used to decrypt it
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* when needed.
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*
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* @param key key
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* @param keyRingProtector protector for the secret key
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* @return options
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*/
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public ConsumerOptions addDecryptionKey(@Nonnull PGPSecretKeyRing key, @Nonnull SecretKeyRingProtector keyRingProtector) {
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decryptionKeys.put(key, keyRingProtector);
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return this;
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}
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/**
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* Add a passphrase for message decryption.
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*
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* @param passphrase passphrase
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* @return options
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*/
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public ConsumerOptions addDecryptionPassphrase(@Nonnull Passphrase passphrase) {
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decryptionPassphrases.add(passphrase);
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return this;
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}
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public Set<PGPSecretKeyRing> getDecryptionKeys() {
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return Collections.unmodifiableSet(decryptionKeys.keySet());
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}
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public Set<Passphrase> getDecryptionPassphrases() {
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return Collections.unmodifiableSet(decryptionPassphrases);
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}
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public Set<PGPPublicKeyRing> getCertificates() {
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return Collections.unmodifiableSet(certificates);
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}
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public MissingPublicKeyCallback getMissingCertificateCallback() {
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return missingCertificateCallback;
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}
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public SecretKeyRingProtector getSecretKeyProtector(PGPSecretKeyRing decryptionKeyRing) {
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return decryptionKeys.get(decryptionKeyRing);
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}
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public Set<PGPSignature> getDetachedSignatures() {
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return Collections.unmodifiableSet(detachedSignatures);
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}
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}
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@ -63,6 +63,15 @@ public class DecryptionBuilder implements DecryptionBuilderInterface {
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class DecryptWithImpl implements DecryptWith {
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@Override
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public DecryptionStream withOptions(ConsumerOptions consumerOptions) throws PGPException, IOException {
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if (consumerOptions == null) {
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throw new IllegalArgumentException("Consumer options cannot be null.");
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}
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return DecryptionStreamFactory.create(inputStream, consumerOptions);
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}
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@Override
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public Verify decryptWith(@Nonnull SecretKeyRingProtector decryptor, @Nonnull PGPSecretKeyRingCollection secretKeyRings) {
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DecryptionBuilder.this.decryptionKeys = secretKeyRings;
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@ -219,8 +228,27 @@ public class DecryptionBuilder implements DecryptionBuilderInterface {
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@Override
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public DecryptionStream build() throws IOException, PGPException {
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return DecryptionStreamFactory.create(inputStream, decryptionKeys, decryptionKeyDecryptor,
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decryptionPassphrase, detachedSignatures, verificationKeys, missingPublicKeyCallback);
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ConsumerOptions options = new ConsumerOptions();
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for (PGPSecretKeyRing decryptionKey : (decryptionKeys != null ? decryptionKeys : Collections.<PGPSecretKeyRing>emptyList())) {
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options.addDecryptionKey(decryptionKey, decryptionKeyDecryptor);
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}
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for (PGPPublicKeyRing certificate : (verificationKeys != null ? verificationKeys : Collections.<PGPPublicKeyRing>emptyList())) {
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options.addVerificationCert(certificate);
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}
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for (PGPSignature detachedSignature : (detachedSignatures != null ? detachedSignatures : Collections.<PGPSignature>emptyList())) {
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options.addVerificationOfDetachedSignature(detachedSignature);
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}
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options.setMissingCertificateCallback(missingPublicKeyCallback);
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if (decryptionPassphrase != null) {
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options.addDecryptionPassphrase(decryptionPassphrase);
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}
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return DecryptionStreamFactory.create(inputStream, options);
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}
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}
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}
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@ -46,6 +46,8 @@ public interface DecryptionBuilderInterface {
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interface DecryptWith {
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DecryptionStream withOptions(ConsumerOptions consumerOptions) throws PGPException, IOException;
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/**
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* Decrypt the encrypted data using the secret keys found in the provided {@link PGPSecretKeyRingCollection}.
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* Here it is assumed that the secret keys are not password protected.
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@ -54,6 +54,7 @@ import org.bouncycastle.openpgp.operator.PGPContentVerifierBuilderProvider;
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import org.bouncycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
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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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@ -62,6 +63,7 @@ import org.pgpainless.exception.UnacceptableAlgorithmException;
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import org.pgpainless.implementation.ImplementationFactory;
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import org.pgpainless.key.OpenPgpV4Fingerprint;
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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.DetachedSignature;
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@ -75,11 +77,7 @@ public final class DecryptionStreamFactory {
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private static final Level LEVEL = Level.FINE;
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private static final int MAX_RECURSION_DEPTH = 16;
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private final PGPSecretKeyRingCollection decryptionKeys;
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private final SecretKeyRingProtector decryptionKeyDecryptor;
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private final Passphrase decryptionPassphrase;
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private final Set<PGPPublicKeyRing> verificationKeys = new HashSet<>();
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private final MissingPublicKeyCallback missingPublicKeyCallback;
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private final ConsumerOptions options;
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private final OpenPgpMetadata.Builder resultBuilder = OpenPgpMetadata.getBuilder();
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private static final PGPContentVerifierBuilderProvider verifierBuilderProvider = ImplementationFactory.getInstance().getPGPContentVerifierBuilderProvider();
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@ -87,33 +85,16 @@ public final class DecryptionStreamFactory {
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private final Map<OpenPgpV4Fingerprint, OnePassSignature> verifiableOnePassSignatures = new HashMap<>();
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private final List<IntegrityProtectedInputStream> integrityProtectedStreams = new ArrayList<>();
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private DecryptionStreamFactory(@Nullable PGPSecretKeyRingCollection decryptionKeys,
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@Nullable SecretKeyRingProtector decryptor,
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@Nullable Passphrase decryptionPassphrase,
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@Nullable Set<PGPPublicKeyRing> verificationKeys,
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@Nullable MissingPublicKeyCallback missingPublicKeyCallback) {
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this.decryptionKeys = decryptionKeys;
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this.decryptionKeyDecryptor = decryptor;
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this.decryptionPassphrase = decryptionPassphrase;
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this.verificationKeys.addAll(verificationKeys != null ? verificationKeys : Collections.emptyList());
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this.missingPublicKeyCallback = missingPublicKeyCallback;
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public DecryptionStreamFactory(ConsumerOptions options) {
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this.options = options;
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}
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public static DecryptionStream create(@Nonnull InputStream inputStream,
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@Nullable PGPSecretKeyRingCollection decryptionKeys,
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@Nullable SecretKeyRingProtector decryptor,
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@Nullable Passphrase decryptionPassphrase,
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@Nullable List<PGPSignature> detachedSignatures,
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@Nullable Set<PGPPublicKeyRing> verificationKeys,
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@Nullable MissingPublicKeyCallback missingPublicKeyCallback)
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throws IOException, PGPException {
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InputStream pgpInputStream;
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DecryptionStreamFactory factory = new DecryptionStreamFactory(decryptionKeys, decryptor,
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decryptionPassphrase, verificationKeys, missingPublicKeyCallback);
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@Nonnull ConsumerOptions options) throws PGPException, IOException {
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InputStream pgpInputStream = inputStream;
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DecryptionStreamFactory factory = new DecryptionStreamFactory(options);
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if (detachedSignatures != null) {
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pgpInputStream = inputStream;
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for (PGPSignature signature : detachedSignatures) {
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for (PGPSignature signature : options.getDetachedSignatures()) {
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PGPPublicKeyRing signingKeyRing = factory.findSignatureVerificationKeyRing(signature.getKeyID());
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if (signingKeyRing == null) {
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continue;
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@ -123,11 +104,11 @@ public final class DecryptionStreamFactory {
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factory.resultBuilder.addDetachedSignature(
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new DetachedSignature(signature, signingKeyRing, new SubkeyIdentifier(signingKeyRing, signature.getKeyID())));
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}
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} else {
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PGPObjectFactory objectFactory = new PGPObjectFactory(
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PGPUtil.getDecoderStream(inputStream), keyFingerprintCalculator);
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pgpInputStream = factory.processPGPPackets(objectFactory, 1);
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}
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return new DecryptionStream(pgpInputStream, factory.resultBuilder, factory.integrityProtectedStreams);
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}
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@ -210,50 +191,68 @@ public final class DecryptionStreamFactory {
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while (encryptedDataIterator.hasNext()) {
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PGPEncryptedData encryptedData = encryptedDataIterator.next();
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// TODO: Can we just skip non-integrity-protected packages?
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if (!encryptedData.isIntegrityProtected()) {
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throw new MessageNotIntegrityProtectedException();
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}
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// Data is passphrase encrypted
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if (encryptedData instanceof PGPPBEEncryptedData) {
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PGPPBEEncryptedData pbeEncryptedData = (PGPPBEEncryptedData) encryptedData;
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if (decryptionPassphrase != null) {
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for (Passphrase passphrase : options.getDecryptionPassphrases()) {
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PBEDataDecryptorFactory passphraseDecryptor = ImplementationFactory.getInstance()
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.getPBEDataDecryptorFactory(decryptionPassphrase);
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.getPBEDataDecryptorFactory(passphrase);
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try {
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InputStream decryptedDataStream = pbeEncryptedData.getDataStream(passphraseDecryptor);
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SymmetricKeyAlgorithm symmetricKeyAlgorithm = SymmetricKeyAlgorithm.fromId(
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pbeEncryptedData.getSymmetricAlgorithm(passphraseDecryptor));
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throwIfAlgorithmIsRejected(symmetricKeyAlgorithm);
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resultBuilder.setSymmetricKeyAlgorithm(symmetricKeyAlgorithm);
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try {
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return pbeEncryptedData.getDataStream(passphraseDecryptor);
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return decryptedDataStream;
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} catch (PGPException e) {
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LOGGER.log(LEVEL, "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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// data is public key encrypted
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else if (encryptedData instanceof PGPPublicKeyEncryptedData) {
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if (options.getDecryptionKeys().isEmpty()) {
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}
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PGPPublicKeyEncryptedData publicKeyEncryptedData = (PGPPublicKeyEncryptedData) encryptedData;
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long keyId = publicKeyEncryptedData.getKeyID();
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if (decryptionKeys != null) {
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if (!options.getDecryptionKeys().isEmpty()) {
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// Known key id
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if (keyId != 0) {
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LOGGER.log(LEVEL, "PGPEncryptedData is encrypted for key " + Long.toHexString(keyId));
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resultBuilder.addRecipientKeyId(keyId);
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PGPSecretKey secretKey = decryptionKeys.getSecretKey(keyId);
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if (secretKey != null) {
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PGPSecretKeyRing decryptionKeyRing = findDecryptionKeyRing(keyId);
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if (decryptionKeyRing != null) {
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PGPSecretKey secretKey = decryptionKeyRing.getSecretKey(keyId);
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LOGGER.log(LEVEL, "Found respective secret key " + Long.toHexString(keyId));
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// Watch out! This assignment is possibly done multiple times.
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encryptedSessionKey = publicKeyEncryptedData;
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decryptionKey = UnlockSecretKey.unlockSecretKey(secretKey, decryptionKeyDecryptor);
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decryptionKey = UnlockSecretKey.unlockSecretKey(secretKey, options.getSecretKeyProtector(decryptionKeyRing));
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resultBuilder.setDecryptionFingerprint(new OpenPgpV4Fingerprint(secretKey));
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}
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} else {
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}
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// Hidden recipient
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else {
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LOGGER.log(LEVEL, "Hidden recipient detected. Try to decrypt with all available secret keys.");
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outerloop: for (PGPSecretKeyRing ring : decryptionKeys) {
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for (PGPSecretKey key : ring) {
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PGPPrivateKey privateKey = key.extractPrivateKey(decryptionKeyDecryptor.getDecryptor(key.getKeyID()));
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outerloop: for (PGPSecretKeyRing ring : options.getDecryptionKeys()) {
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KeyRingInfo info = new KeyRingInfo(ring);
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List<PGPPublicKey> encryptionSubkeys = info.getEncryptionSubkeys(EncryptionPurpose.STORAGE_AND_COMMUNICATIONS);
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for (PGPPublicKey pubkey : encryptionSubkeys) {
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PGPSecretKey key = ring.getSecretKey(pubkey.getKeyID());
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if (key == null) {
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continue;
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}
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PGPPrivateKey privateKey = UnlockSecretKey.unlockSecretKey(key, options.getSecretKeyProtector(ring).getDecryptor(key.getKeyID()));
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PublicKeyDataDecryptorFactory decryptorFactory = ImplementationFactory.getInstance().getPublicKeyDataDecryptorFactory(privateKey);
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try {
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publicKeyEncryptedData.getSymmetricAlgorithm(decryptorFactory); // will only succeed if we have the right secret key
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@ -271,7 +270,11 @@ public final class DecryptionStreamFactory {
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}
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}
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}
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return decryptWith(encryptedSessionKey, decryptionKey);
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}
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private InputStream decryptWith(PGPPublicKeyEncryptedData encryptedSessionKey, PGPPrivateKey decryptionKey)
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throws PGPException {
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if (decryptionKey == null) {
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throw new MissingDecryptionMethodException("Decryption failed - No suitable decryption key or passphrase found");
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}
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@ -339,9 +342,18 @@ public final class DecryptionStreamFactory {
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verifiableOnePassSignatures.put(fingerprint, onePassSignature);
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}
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private PGPSecretKeyRing findDecryptionKeyRing(long keyId) {
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for (PGPSecretKeyRing key : options.getDecryptionKeys()) {
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if (key.getSecretKey(keyId) != null) {
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return key;
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}
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}
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return null;
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}
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private PGPPublicKeyRing findSignatureVerificationKeyRing(long keyId) {
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PGPPublicKeyRing verificationKeyRing = null;
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for (PGPPublicKeyRing publicKeyRing : verificationKeys) {
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for (PGPPublicKeyRing publicKeyRing : options.getCertificates()) {
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PGPPublicKey verificationKey = publicKeyRing.getPublicKey(keyId);
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if (verificationKey != null) {
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LOGGER.log(LEVEL, "Found public key " + Long.toHexString(keyId) + " for signature verification");
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@ -350,8 +362,8 @@ public final class DecryptionStreamFactory {
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}
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}
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||||
if (verificationKeyRing == null && missingPublicKeyCallback != null) {
|
||||
verificationKeyRing = missingPublicKeyCallback.onMissingPublicKeyEncountered(keyId);
|
||||
if (verificationKeyRing == null && options.getMissingCertificateCallback() != null) {
|
||||
verificationKeyRing = options.getMissingCertificateCallback().onMissingPublicKeyEncountered(keyId);
|
||||
}
|
||||
|
||||
return verificationKeyRing;
|
||||
|
|
|
|||
|
|
@ -109,7 +109,7 @@ public class SymmetricEncryptionTest {
|
|||
|
||||
@ParameterizedTest
|
||||
@MethodSource("org.pgpainless.util.TestUtil#provideImplementationFactories")
|
||||
public void testMissmatchPassphraseFails(ImplementationFactory implementationFactory) throws IOException, PGPException {
|
||||
public void testMismatchPassphraseFails(ImplementationFactory implementationFactory) throws IOException, PGPException {
|
||||
ImplementationFactory.setFactoryImplementation(implementationFactory);
|
||||
|
||||
byte[] bytes = new byte[5000];
|
||||
|
|
|
|||
Loading…
Reference in a new issue