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Kotlin conversion: MessageMetadata

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Paul Schaub 2023-09-06 14:42:44 +02:00
parent b09979fa45
commit 4cfdcca2e0
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
5 changed files with 549 additions and 888 deletions
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pgpainless-core/src/main/java/org/pgpainless/decryption_verification/MessageMetadata.java
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// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package org.pgpainless.decryption_verification;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.bouncycastle.openpgp.PGPKeyRing;
import org.bouncycastle.openpgp.PGPLiteralData;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.pgpainless.algorithm.CompressionAlgorithm;
import org.pgpainless.algorithm.StreamEncoding;
import org.pgpainless.algorithm.SymmetricKeyAlgorithm;
import org.pgpainless.authentication.CertificateAuthenticity;
import org.pgpainless.authentication.CertificateAuthority;
import org.pgpainless.exception.MalformedOpenPgpMessageException;
import org.pgpainless.key.OpenPgpFingerprint;
import org.pgpainless.key.SubkeyIdentifier;
import org.pgpainless.util.SessionKey;
/**
* View for extracting metadata about a {@link Message}.
*/
public class MessageMetadata {
protected Message message;
public MessageMetadata(@Nonnull Message message) {
this.message = message;
}
public boolean isUsingCleartextSignatureFramework() {
return message.isCleartextSigned();
}
public boolean isEncrypted() {
SymmetricKeyAlgorithm algorithm = getEncryptionAlgorithm();
return algorithm != null && algorithm != SymmetricKeyAlgorithm.NULL;
}
public boolean isEncryptedFor(@Nonnull PGPKeyRing keys) {
Iterator<EncryptedData> encryptionLayers = getEncryptionLayers();
while (encryptionLayers.hasNext()) {
EncryptedData encryptedData = encryptionLayers.next();
for (long recipient : encryptedData.getRecipients()) {
PGPPublicKey key = keys.getPublicKey(recipient);
if (key != null) {
return true;
}
}
}
return false;
}
/**
* Return true, if the message was signed by a certificate for which we can authenticate a binding to the given userId.
*
* @param userId userId
* @param email if true, treat the user-id as an email address and match all userIDs containing this address
* @param certificateAuthority certificate authority
* @return true, if we can authenticate a binding for a signing key with sufficient evidence
*/
public boolean isAuthenticatablySignedBy(String userId, boolean email, CertificateAuthority certificateAuthority) {
return isAuthenticatablySignedBy(userId, email, certificateAuthority, 120);
}
/**
* Return true, if the message was verifiably signed by a certificate for which we can authenticate a binding to the given userId.
*
* @param userId userId
* @param email if true, treat the user-id as an email address and match all userIDs containing this address
* @param certificateAuthority certificate authority
* @param targetAmount target trust amount
* @return true, if we can authenticate a binding for a signing key with sufficient evidence
*/
public boolean isAuthenticatablySignedBy(String userId, boolean email, CertificateAuthority certificateAuthority, int targetAmount) {
for (SignatureVerification verification : getVerifiedSignatures()) {
CertificateAuthenticity authenticity = certificateAuthority.authenticateBinding(
verification.getSigningKey().getFingerprint(), userId, email,
verification.getSignature().getCreationTime(), targetAmount);
if (authenticity.isAuthenticated()) {
return true;
}
}
return false;
}
/**
* Return a list containing all recipient keyIDs.
*
* @return list of recipients
*/
public List<Long> getRecipientKeyIds() {
List<Long> keyIds = new ArrayList<>();
Iterator<EncryptedData> encLayers = getEncryptionLayers();
while (encLayers.hasNext()) {
EncryptedData layer = encLayers.next();
keyIds.addAll(layer.getRecipients());
}
return keyIds;
}
public @Nonnull Iterator<EncryptedData> getEncryptionLayers() {
return new LayerIterator<EncryptedData>(message) {
@Override
public boolean matches(Packet layer) {
return layer instanceof EncryptedData;
}
@Override
public EncryptedData getProperty(Layer last) {
return (EncryptedData) last;
}
};
}
/**
* Return the {@link SymmetricKeyAlgorithm} of the outermost encrypted data packet, or null if message is
* unencrypted.
*
* @return encryption algorithm
*/
public @Nullable SymmetricKeyAlgorithm getEncryptionAlgorithm() {
return firstOrNull(getEncryptionAlgorithms());
}
/**
* Return an {@link Iterator} of {@link SymmetricKeyAlgorithm SymmetricKeyAlgorithms} encountered in the message.
* The first item returned by the iterator is the algorithm of the outermost encrypted data packet, the next item
* that of the next nested encrypted data packet and so on.
* The iterator might also be empty, in case of an unencrypted message.
*
* @return iterator of symmetric encryption algorithms
*/
public @Nonnull Iterator<SymmetricKeyAlgorithm> getEncryptionAlgorithms() {
return map(getEncryptionLayers(), encryptedData -> encryptedData.algorithm);
}
public @Nonnull Iterator<CompressedData> getCompressionLayers() {
return new LayerIterator<CompressedData>(message) {
@Override
boolean matches(Packet layer) {
return layer instanceof CompressedData;
}
@Override
CompressedData getProperty(Layer last) {
return (CompressedData) last;
}
};
}
/**
* Return the {@link CompressionAlgorithm} of the outermost compressed data packet, or null, if the message
* does not contain any compressed data packets.
*
* @return compression algorithm
*/
public @Nullable CompressionAlgorithm getCompressionAlgorithm() {
return firstOrNull(getCompressionAlgorithms());
}
/**
* Return an {@link Iterator} of {@link CompressionAlgorithm CompressionAlgorithms} encountered in the message.
* The first item returned by the iterator is the algorithm of the outermost compressed data packet, the next
* item that of the next nested compressed data packet and so on.
* The iterator might also be empty, in case of a message without any compressed data packets.
*
* @return iterator of compression algorithms
*/
public @Nonnull Iterator<CompressionAlgorithm> getCompressionAlgorithms() {
return map(getCompressionLayers(), compressionLayer -> compressionLayer.algorithm);
}
/**
* Return the {@link SessionKey} of the outermost encrypted data packet.
* If the message was unencrypted, this method returns <pre>null</pre>.
*
* @return session key of the message
*/
public @Nullable SessionKey getSessionKey() {
return firstOrNull(getSessionKeys());
}
/**
* Return an {@link Iterator} of {@link SessionKey SessionKeys} for all encrypted data packets in the message.
* The first item returned by the iterator is the session key of the outermost encrypted data packet,
* the next item that of the next nested encrypted data packet and so on.
* The iterator might also be empty, in case of an unencrypted message.
*
* @return iterator of session keys
*/
public @Nonnull Iterator<SessionKey> getSessionKeys() {
return map(getEncryptionLayers(), encryptedData -> encryptedData.sessionKey);
}
public boolean isVerifiedSignedBy(@Nonnull PGPKeyRing keys) {
return isVerifiedInlineSignedBy(keys) || isVerifiedDetachedSignedBy(keys);
}
/**
* Return true, if the message was verifiable signed by a certificate that either has the given fingerprint
* as primary key, or as the signing subkey.
*
* @param fingerprint fingerprint
* @return true if message was signed by a cert identified by the given fingerprint
*/
public boolean isVerifiedSignedBy(@Nonnull OpenPgpFingerprint fingerprint) {
List<SignatureVerification> verifications = getVerifiedSignatures();
for (SignatureVerification verification : verifications) {
if (verification.getSigningKey() == null) {
continue;
}
if (fingerprint.equals(verification.getSigningKey().getPrimaryKeyFingerprint()) ||
fingerprint.equals(verification.getSigningKey().getSubkeyFingerprint())) {
return true;
}
}
return false;
}
public List<SignatureVerification> getVerifiedSignatures() {
List<SignatureVerification> allVerifiedSignatures = getVerifiedInlineSignatures();
allVerifiedSignatures.addAll(getVerifiedDetachedSignatures());
return allVerifiedSignatures;
}
public boolean isVerifiedDetachedSignedBy(@Nonnull PGPKeyRing keys) {
return containsSignatureBy(getVerifiedDetachedSignatures(), keys);
}
/**
* Return a list of all verified detached signatures.
* This list contains all acceptable, correct detached signatures.
*
* @return verified detached signatures
*/
public @Nonnull List<SignatureVerification> getVerifiedDetachedSignatures() {
return message.getVerifiedDetachedSignatures();
}
/**
* Return a list of all rejected detached signatures.
*
* @return rejected detached signatures
*/
public @Nonnull List<SignatureVerification.Failure> getRejectedDetachedSignatures() {
return message.getRejectedDetachedSignatures();
}
/**
* Return a list of all rejected signatures.
*
* @return rejected signatures
*/
public @Nonnull List<SignatureVerification.Failure> getRejectedSignatures() {
List<SignatureVerification.Failure> rejected = new ArrayList<>();
rejected.addAll(getRejectedInlineSignatures());
rejected.addAll(getRejectedDetachedSignatures());
return rejected;
}
public boolean hasRejectedSignatures() {
return !getRejectedSignatures().isEmpty();
}
/**
* Return true, if the message contains any (verified or rejected) signature.
* @return true if message has signature
*/
public boolean hasSignature() {
return isVerifiedSigned() || hasRejectedSignatures();
}
public boolean isVerifiedInlineSignedBy(@Nonnull PGPKeyRing keys) {
return containsSignatureBy(getVerifiedInlineSignatures(), keys);
}
/**
* Return a list of all verified inline-signatures.
* This list contains all acceptable, correct signatures that were part of the message itself.
*
* @return verified inline signatures
*/
public @Nonnull List<SignatureVerification> getVerifiedInlineSignatures() {
List<SignatureVerification> verifications = new ArrayList<>();
Iterator<List<SignatureVerification>> verificationsByLayer = getVerifiedInlineSignaturesByLayer();
while (verificationsByLayer.hasNext()) {
verifications.addAll(verificationsByLayer.next());
}
return verifications;
}
/**
* Return an {@link Iterator} of {@link List Lists} of verified inline-signatures of the message.
* Since signatures might occur in different layers within a message, this method can be used to gain more detailed
* insights into what signatures were encountered at what layers of the message structure.
* Each item of the {@link Iterator} represents a layer of the message and contains only signatures from
* this layer.
* An empty list means no (or no acceptable) signatures were encountered in that layer.
*
* @return iterator of lists of signatures by-layer.
*/
public @Nonnull Iterator<List<SignatureVerification>> getVerifiedInlineSignaturesByLayer() {
return new LayerIterator<List<SignatureVerification>>(message) {
@Override
boolean matches(Packet layer) {
return layer instanceof Layer;
}
@Override
List<SignatureVerification> getProperty(Layer last) {
List<SignatureVerification> list = new ArrayList<>();
list.addAll(last.getVerifiedOnePassSignatures());
list.addAll(last.getVerifiedPrependedSignatures());
return list;
}
};
}
/**
* Return a list of all rejected inline-signatures of the message.
*
* @return list of rejected inline-signatures
*/
public @Nonnull List<SignatureVerification.Failure> getRejectedInlineSignatures() {
List<SignatureVerification.Failure> rejected = new ArrayList<>();
Iterator<List<SignatureVerification.Failure>> rejectedByLayer = getRejectedInlineSignaturesByLayer();
while (rejectedByLayer.hasNext()) {
rejected.addAll(rejectedByLayer.next());
}
return rejected;
}
/**
* Similar to {@link #getVerifiedInlineSignaturesByLayer()}, this method returns all rejected inline-signatures
* of the message, but organized by layer.
*
* @return rejected inline-signatures by-layer
*/
public @Nonnull Iterator<List<SignatureVerification.Failure>> getRejectedInlineSignaturesByLayer() {
return new LayerIterator<List<SignatureVerification.Failure>>(message) {
@Override
boolean matches(Packet layer) {
return layer instanceof Layer;
}
@Override
List<SignatureVerification.Failure> getProperty(Layer last) {
List<SignatureVerification.Failure> list = new ArrayList<>();
list.addAll(last.getRejectedOnePassSignatures());
list.addAll(last.getRejectedPrependedSignatures());
return list;
}
};
}
private static boolean containsSignatureBy(@Nonnull List<SignatureVerification> verifications,
@Nonnull PGPKeyRing keys) {
for (SignatureVerification verification : verifications) {
SubkeyIdentifier issuer = verification.getSigningKey();
if (issuer == null) {
// No issuer, shouldn't happen, but better be safe and skip...
continue;
}
if (keys.getPublicKey().getKeyID() != issuer.getPrimaryKeyId()) {
// Wrong cert
continue;
}
if (keys.getPublicKey(issuer.getSubkeyId()) != null) {
// Matching cert and signing key
return true;
}
}
return false;
}
/**
* Return the value of the literal data packet's filename field.
* This value can be used to store a decrypted file under its original filename,
* but since this field is not necessarily part of the signed data of a message, usage of this field is
* discouraged.
*
* @return filename
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-5.9">RFC4880 §5.9. Literal Data Packet</a>
*/
public @Nullable String getFilename() {
LiteralData literalData = findLiteralData();
if (literalData == null) {
return null;
}
return literalData.getFileName();
}
/**
* Returns true, if the filename of the literal data packet indicates that the data is intended for your eyes only.
*
* @return isForYourEyesOnly
*/
public boolean isForYourEyesOnly() {
return PGPLiteralData.CONSOLE.equals(getFilename());
}
/**
* Return the value of the literal data packets modification date field.
* This value can be used to restore the modification date of a decrypted file,
* but since this field is not necessarily part of the signed data, its use is discouraged.
*
* @return modification date
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-5.9">RFC4880 §5.9. Literal Data Packet</a>
*/
public @Nullable Date getModificationDate() {
LiteralData literalData = findLiteralData();
if (literalData == null) {
return null;
}
return literalData.getModificationDate();
}
/**
* Return the value of the format field of the literal data packet.
* This value indicates what format (text, binary data, ...) the data has.
* Since this field is not necessarily part of the signed data of a message, its usage is discouraged.
*
* @return format
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-5.9">RFC4880 §5.9. Literal Data Packet</a>
*/
public @Nullable StreamEncoding getLiteralDataEncoding() {
LiteralData literalData = findLiteralData();
if (literalData == null) {
return null;
}
return literalData.getFormat();
}
/**
* Find the {@link LiteralData} layer of an OpenPGP message.
* Usually, every message has a literal data packet, but for malformed messages this method might still
* return <pre>null</pre>.
*
* @return literal data
*/
private @Nullable LiteralData findLiteralData() {
Nested nested = message.getChild();
if (nested == null) {
return null;
}
while (nested != null && nested.hasNestedChild()) {
Layer layer = (Layer) nested;
nested = layer.getChild();
}
return (LiteralData) nested;
}
/**
* Return the {@link SubkeyIdentifier} of the decryption key that was used to decrypt the outermost encryption
* layer.
* If the message was unencrypted, this might return <pre>null</pre>.
*
* @return decryption key
*/
public SubkeyIdentifier getDecryptionKey() {
return firstOrNull(map(getEncryptionLayers(), encryptedData -> encryptedData.decryptionKey));
}
public boolean isVerifiedSigned() {
return !getVerifiedSignatures().isEmpty();
}
public interface Packet {
}
public abstract static class Layer implements Packet {
public static final int MAX_LAYER_DEPTH = 16;
protected final int depth;
protected final List<SignatureVerification> verifiedDetachedSignatures = new ArrayList<>();
protected final List<SignatureVerification.Failure> rejectedDetachedSignatures = new ArrayList<>();
protected final List<SignatureVerification> verifiedOnePassSignatures = new ArrayList<>();
protected final List<SignatureVerification.Failure> rejectedOnePassSignatures = new ArrayList<>();
protected final List<SignatureVerification> verifiedPrependedSignatures = new ArrayList<>();
protected final List<SignatureVerification.Failure> rejectedPrependedSignatures = new ArrayList<>();
protected Nested child;
public Layer(int depth) {
this.depth = depth;
if (depth > MAX_LAYER_DEPTH) {
throw new MalformedOpenPgpMessageException("Maximum packet nesting depth (" + MAX_LAYER_DEPTH + ") exceeded.");
}
}
/**
* Return the nested child element of this layer.
* Might return <pre>null</pre>, if this layer does not have a child element
* (e.g. if this is a {@link LiteralData} packet).
*
* @return child element
*/
public @Nullable Nested getChild() {
return child;
}
/**
* Set the nested child element for this layer.
*
* @param child child element
*/
void setChild(Nested child) {
this.child = child;
}
/**
* Return a list of all verified detached signatures of this layer.
*
* @return all verified detached signatures of this layer
*/
public List<SignatureVerification> getVerifiedDetachedSignatures() {
return new ArrayList<>(verifiedDetachedSignatures);
}
/**
* Return a list of all rejected detached signatures of this layer.
*
* @return all rejected detached signatures of this layer
*/
public List<SignatureVerification.Failure> getRejectedDetachedSignatures() {
return new ArrayList<>(rejectedDetachedSignatures);
}
/**
* Add a verified detached signature for this layer.
*
* @param signatureVerification verified detached signature
*/
void addVerifiedDetachedSignature(SignatureVerification signatureVerification) {
verifiedDetachedSignatures.add(signatureVerification);
}
/**
* Add a rejected detached signature for this layer.
*
* @param failure rejected detached signature
*/
void addRejectedDetachedSignature(SignatureVerification.Failure failure) {
rejectedDetachedSignatures.add(failure);
}
/**
* Return a list of all verified one-pass-signatures of this layer.
*
* @return all verified one-pass-signatures of this layer
*/
public List<SignatureVerification> getVerifiedOnePassSignatures() {
return new ArrayList<>(verifiedOnePassSignatures);
}
/**
* Return a list of all rejected one-pass-signatures of this layer.
*
* @return all rejected one-pass-signatures of this layer
*/
public List<SignatureVerification.Failure> getRejectedOnePassSignatures() {
return new ArrayList<>(rejectedOnePassSignatures);
}
/**
* Add a verified one-pass-signature for this layer.
*
* @param verifiedOnePassSignature verified one-pass-signature for this layer
*/
void addVerifiedOnePassSignature(SignatureVerification verifiedOnePassSignature) {
this.verifiedOnePassSignatures.add(verifiedOnePassSignature);
}
/**
* Add a rejected one-pass-signature for this layer.
*
* @param rejected rejected one-pass-signature for this layer
*/
void addRejectedOnePassSignature(SignatureVerification.Failure rejected) {
this.rejectedOnePassSignatures.add(rejected);
}
/**
* Return a list of all verified prepended signatures of this layer.
*
* @return all verified prepended signatures of this layer
*/
public List<SignatureVerification> getVerifiedPrependedSignatures() {
return new ArrayList<>(verifiedPrependedSignatures);
}
/**
* Return a list of all rejected prepended signatures of this layer.
*
* @return all rejected prepended signatures of this layer
*/
public List<SignatureVerification.Failure> getRejectedPrependedSignatures() {
return new ArrayList<>(rejectedPrependedSignatures);
}
/**
* Add a verified prepended signature for this layer.
*
* @param verified verified prepended signature
*/
void addVerifiedPrependedSignature(SignatureVerification verified) {
this.verifiedPrependedSignatures.add(verified);
}
/**
* Add a rejected prepended signature for this layer.
*
* @param rejected rejected prepended signature
*/
void addRejectedPrependedSignature(SignatureVerification.Failure rejected) {
this.rejectedPrependedSignatures.add(rejected);
}
}
public interface Nested extends Packet {
boolean hasNestedChild();
}
public static class Message extends Layer {
protected boolean cleartextSigned;
public Message() {
super(0);
}
/**
* Returns true, is the message is a signed message using the cleartext signature framework.
*
* @return <pre>true</pre> if message is cleartext-signed, <pre>false</pre> otherwise
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-7">RFC4880 §7. Cleartext Signature Framework</a>
*/
public boolean isCleartextSigned() {
return cleartextSigned;
}
}
public static class LiteralData implements Nested {
protected String fileName;
protected Date modificationDate;
protected StreamEncoding format;
public LiteralData() {
this("", new Date(0L), StreamEncoding.BINARY);
}
public LiteralData(@Nonnull String fileName,
@Nonnull Date modificationDate,
@Nonnull StreamEncoding format) {
this.fileName = fileName;
this.modificationDate = modificationDate;
this.format = format;
}
/**
* Return the value of the filename field.
* An empty String <pre>""</pre> indicates no filename.
*
* @return filename
*/
public @Nonnull String getFileName() {
return fileName;
}
/**
* Return the value of the modification date field.
* A special date <pre>{@code new Date(0L)}</pre> indicates no modification date.
*
* @return modification date
*/
public @Nonnull Date getModificationDate() {
return modificationDate;
}
/**
* Return the value of the format field.
*
* @return format
*/
public @Nonnull StreamEncoding getFormat() {
return format;
}
@Override
public boolean hasNestedChild() {
// A literal data packet MUST NOT have a child element, as its content is the plaintext
return false;
}
}
public static class CompressedData extends Layer implements Nested {
protected final CompressionAlgorithm algorithm;
public CompressedData(@Nonnull CompressionAlgorithm zip, int depth) {
super(depth);
this.algorithm = zip;
}
/**
* Return the {@link CompressionAlgorithm} used to compress the packet.
* @return compression algorithm
*/
public @Nonnull CompressionAlgorithm getAlgorithm() {
return algorithm;
}
@Override
public boolean hasNestedChild() {
// A compressed data packet MUST have a child element
return true;
}
}
public static class EncryptedData extends Layer implements Nested {
protected final SymmetricKeyAlgorithm algorithm;
protected SubkeyIdentifier decryptionKey;
protected SessionKey sessionKey;
protected List<Long> recipients;
public EncryptedData(@Nonnull SymmetricKeyAlgorithm algorithm, int depth) {
super(depth);
this.algorithm = algorithm;
}
/**
* Return the {@link SymmetricKeyAlgorithm} used to encrypt the packet.
* @return symmetric encryption algorithm
*/
public @Nonnull SymmetricKeyAlgorithm getAlgorithm() {
return algorithm;
}
/**
* Return the {@link SessionKey} used to decrypt the packet.
*
* @return session key
*/
public @Nonnull SessionKey getSessionKey() {
return sessionKey;
}
/**
* Return a list of all recipient key ids to which the packet was encrypted for.
*
* @return recipients
*/
public @Nonnull List<Long> getRecipients() {
if (recipients == null) {
return new ArrayList<>();
}
return new ArrayList<>(recipients);
}
@Override
public boolean hasNestedChild() {
// An encrypted data packet MUST have a child element
return true;
}
}
private abstract static class LayerIterator<O> implements Iterator<O> {
private Nested current;
Layer last = null;
Message parent;
LayerIterator(@Nonnull Message message) {
super();
this.parent = message;
this.current = message.getChild();
if (matches(current)) {
last = (Layer) current;
}
}
@Override
public boolean hasNext() {
if (parent != null && matches(parent)) {
return true;
}
if (last == null) {
findNext();
}
return last != null;
}
@Override
public O next() {
if (parent != null && matches(parent)) {
O property = getProperty(parent);
parent = null;
return property;
}
if (last == null) {
findNext();
}
if (last != null) {
O property = getProperty(last);
last = null;
return property;
}
throw new NoSuchElementException();
}
private void findNext() {
while (current != null && current instanceof Layer) {
current = ((Layer) current).getChild();
if (matches(current)) {
last = (Layer) current;
break;
}
}
}
abstract boolean matches(Packet layer);
abstract O getProperty(Layer last);
}
private static <A,B> Iterator<B> map(Iterator<A> from, Function<A, B> mapping) {
return new Iterator<B>() {
@Override
public boolean hasNext() {
return from.hasNext();
}
@Override
public B next() {
return mapping.apply(from.next());
}
};
}
public interface Function<A, B> {
B apply(A item);
}
private static @Nullable <A> A firstOrNull(Iterator<A> iterator) {
if (iterator.hasNext()) {
return iterator.next();
}
return null;
}
private static @Nonnull <A> A firstOr(Iterator<A> iterator, A item) {
if (iterator.hasNext()) {
return iterator.next();
}
return item;
}
}

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pgpainless-core/src/main/kotlin/org/pgpainless/decryption_verification/MessageMetadata.kt Normal file
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package org.pgpainless.decryption_verification
import org.bouncycastle.openpgp.PGPKeyRing
import org.bouncycastle.openpgp.PGPLiteralData
import org.pgpainless.algorithm.CompressionAlgorithm
import org.pgpainless.algorithm.StreamEncoding
import org.pgpainless.algorithm.SymmetricKeyAlgorithm
import org.pgpainless.authentication.CertificateAuthority
import org.pgpainless.exception.MalformedOpenPgpMessageException
import org.pgpainless.key.OpenPgpFingerprint
import org.pgpainless.key.SubkeyIdentifier
import org.pgpainless.util.SessionKey
import java.util.*
import javax.annotation.Nonnull
/**
* View for extracting metadata about a [Message].
*/
class MessageMetadata(
val message: Message
) {
// ################################################################################################################
// ### Encryption ###
// ################################################################################################################
/**
* The [SymmetricKeyAlgorithm] of the outermost encrypted data packet, or null if message is unencrypted.
*/
val encryptionAlgorithm: SymmetricKeyAlgorithm?
get() = encryptionAlgorithms.let {
if (it.hasNext()) it.next() else null
}
/**
* [Iterator] of each [SymmetricKeyAlgorithm] encountered in the message.
* The first item returned by the iterator is the algorithm of the outermost encrypted data packet, the next item
* that of the next nested encrypted data packet and so on.
* The iterator might also be empty, in case of an unencrypted message.
*/
val encryptionAlgorithms: Iterator<SymmetricKeyAlgorithm>
get() = encryptionLayers.asSequence().map { it.algorithm }.iterator()
val isEncrypted: Boolean
get() = if (encryptionAlgorithm == null) false else encryptionAlgorithm != SymmetricKeyAlgorithm.NULL
fun isEncryptedFor(keys: PGPKeyRing): Boolean {
return encryptionLayers.asSequence().any {
it.recipients.any { keyId ->
keys.getPublicKey(keyId) != null
}
}
}
/**
* [SessionKey] of the outermost encrypted data packet.
* If the message was unencrypted, this method returns `null`.
*/
val sessionKey: SessionKey?
get() = sessionKeys.asSequence().firstOrNull()
/**
* [Iterator] of each [SessionKey] for all encrypted data packets in the message.
* The first item returned by the iterator is the session key of the outermost encrypted data packet,
* the next item that of the next nested encrypted data packet and so on.
* The iterator might also be empty, in case of an unencrypted message.
*/
val sessionKeys: Iterator<SessionKey>
get() = encryptionLayers.asSequence().mapNotNull { it.sessionKey }.iterator()
/**
* [SubkeyIdentifier] of the decryption key that was used to decrypt the outermost encryption
* layer.
* If the message was unencrypted or was decrypted using a passphrase, this field might be `null`.
*/
val decryptionKey: SubkeyIdentifier?
get() = encryptionLayers.asSequence()
.mapNotNull { it.decryptionKey }
.firstOrNull()
/**
* List containing all recipient keyIDs.
*/
val recipientKeyIds: List<Long>
get() = encryptionLayers.asSequence()
.map { it.recipients.toMutableList() }
.reduce { all, keyIds -> all.addAll(keyIds); all }
.toList()
val encryptionLayers: Iterator<EncryptedData>
get() = object : LayerIterator<EncryptedData>(message) {
override fun matches(layer: Packet) = layer is EncryptedData
override fun getProperty(last: Layer) = last as EncryptedData
}
// ################################################################################################################
// ### Compression ###
// ################################################################################################################
/**
* [CompressionAlgorithm] of the outermost compressed data packet, or null, if the message
* does not contain any compressed data packets.
*/
val compressionAlgorithm: CompressionAlgorithm? = compressionAlgorithms.asSequence().firstOrNull()
/**
* [Iterator] of each [CompressionAlgorithm] encountered in the message.
* The first item returned by the iterator is the algorithm of the outermost compressed data packet, the next
* item that of the next nested compressed data packet and so on.
* The iterator might also be empty, in case of a message without any compressed data packets.
*/
val compressionAlgorithms: Iterator<CompressionAlgorithm>
get() = compressionLayers.asSequence().map { it.algorithm }.iterator()
val compressionLayers: Iterator<CompressedData>
get() = object : LayerIterator<CompressedData>(message) {
override fun matches(layer: Packet) = layer is CompressedData
override fun getProperty(last: Layer) = last as CompressedData
}
// ################################################################################################################
// ### Signatures ###
// ################################################################################################################
val isUsingCleartextSignatureFramework: Boolean
get() = message.cleartextSigned
val verifiedSignatures: List<SignatureVerification>
get() = verifiedInlineSignatures.plus(verifiedDetachedSignatures)
/**
* List of all rejected signatures.
*/
val rejectedSignatures: List<SignatureVerification.Failure>
get() = mutableListOf<SignatureVerification.Failure>()
.plus(rejectedInlineSignatures)
.plus(rejectedDetachedSignatures)
.toList()
/**
* List of all verified inline-signatures.
* This list contains all acceptable, correct signatures that were part of the message itself.
*/
val verifiedInlineSignatures: List<SignatureVerification> = verifiedInlineSignaturesByLayer
.asSequence()
.map { it.toMutableList() }
.reduce { acc, signatureVerifications -> acc.addAll(signatureVerifications); acc }
.toList()
/**
* [Iterator] of each [List] of verified inline-signatures of the message, separated by layer.
* Since signatures might occur in different layers within a message, this method can be used to gain more detailed
* insights into what signatures were encountered at what layers of the message structure.
* Each item of the [Iterator] represents a layer of the message and contains only signatures from
* this layer.
* An empty list means no (or no acceptable) signatures were encountered in that layer.
*/
val verifiedInlineSignaturesByLayer: Iterator<List<SignatureVerification>>
get() = object : LayerIterator<List<SignatureVerification>>(message) {
override fun matches(layer: Packet) = layer is Layer
override fun getProperty(last: Layer): List<SignatureVerification> {
return listOf<SignatureVerification>()
.plus(last.verifiedOnePassSignatures)
.plus(last.verifiedPrependedSignatures)
}
}
/**
* List of all rejected inline-signatures of the message.
*/
val rejectedInlineSignatures: List<SignatureVerification.Failure> = rejectedInlineSignaturesByLayer
.asSequence()
.map { it.toMutableList() }
.reduce { acc, failures -> acc.addAll(failures); acc}
.toList()
/**
* Similar to [verifiedInlineSignaturesByLayer], this field contains all rejected inline-signatures
* of the message, but organized by layer.
*/
val rejectedInlineSignaturesByLayer: Iterator<List<SignatureVerification.Failure>>
get() = object : LayerIterator<List<SignatureVerification.Failure>>(message) {
override fun matches(layer: Packet) = layer is Layer
override fun getProperty(last: Layer): List<SignatureVerification.Failure> =
mutableListOf<SignatureVerification.Failure>()
.plus(last.rejectedOnePassSignatures)
.plus(last.rejectedPrependedSignatures)
}
/**
* List of all verified detached signatures.
* This list contains all acceptable, correct detached signatures.
*/
val verifiedDetachedSignatures: List<SignatureVerification> = message.verifiedDetachedSignatures
/**
* List of all rejected detached signatures.
*/
val rejectedDetachedSignatures: List<SignatureVerification.Failure> = message.rejectedDetachedSignatures
/**
* True, if the message contains any (verified or rejected) signature, false if no signatures are present.
*/
val hasSignature: Boolean
get() = isVerifiedSigned() || hasRejectedSignatures()
fun isVerifiedSigned(): Boolean = verifiedSignatures.isNotEmpty()
fun hasRejectedSignatures(): Boolean = rejectedSignatures.isNotEmpty()
/**
* Return true, if the message was signed by a certificate for which we can authenticate a binding to the given userId.
*
* @param userId userId
* @param email if true, treat the user-id as an email address and match all userIDs containing this address
* @param certificateAuthority certificate authority
* @param targetAmount targeted trust amount that needs to be reached by the binding to qualify as authenticated.
* defaults to 120.
* @return true, if we can authenticate a binding for a signing key with sufficient evidence
*/
@JvmOverloads
fun isAuthenticatablySignedBy(userId: String, email: Boolean, certificateAuthority: CertificateAuthority, targetAmount: Int = 120): Boolean {
return verifiedSignatures.any {
certificateAuthority.authenticateBinding(
it.signingKey.fingerprint, userId, email, it.signature.creationTime, targetAmount
).authenticated
}
}
/**
* Return rue, if the message was verifiable signed by a certificate that either has the given fingerprint
* as primary key, or as the signing subkey.
*
* @param fingerprint fingerprint
* @return true if message was signed by a cert identified by the given fingerprint
*/
fun isVerifiedSignedBy(fingerprint: OpenPgpFingerprint) = verifiedSignatures.any {
it.signingKey.primaryKeyFingerprint == fingerprint || it.signingKey.subkeyFingerprint == fingerprint
}
fun isVerifiedSignedBy(keys: PGPKeyRing) = containsSignatureBy(verifiedSignatures, keys)
fun isVerifiedDetachedSignedBy(fingerprint: OpenPgpFingerprint) = verifiedDetachedSignatures.any {
it.signingKey.primaryKeyFingerprint == fingerprint || it.signingKey.subkeyFingerprint == fingerprint
}
fun isVerifiedDetachedSignedBy(keys: PGPKeyRing) = containsSignatureBy(verifiedDetachedSignatures, keys)
fun isVerifiedInlineSignedBy(fingerprint: OpenPgpFingerprint) = verifiedInlineSignatures.any {
it.signingKey.primaryKeyFingerprint == fingerprint || it.signingKey.subkeyFingerprint == fingerprint
}
fun isVerifiedInlineSignedBy(keys: PGPKeyRing) = containsSignatureBy(verifiedInlineSignatures, keys)
private fun containsSignatureBy(signatures: List<SignatureVerification>, keys: PGPKeyRing) =
signatures.any {
// Match certificate by primary key id
keys.publicKey.keyID == it.signingKey.primaryKeyId &&
// match signing subkey
keys.getPublicKey(it.signingKey.subkeyId) != null
}
// ################################################################################################################
// ### Literal Data ###
// ################################################################################################################
/**
* Value of the literal data packet's filename field.
* This value can be used to store a decrypted file under its original filename,
* but since this field is not necessarily part of the signed data of a message, usage of this field is
* discouraged.
*
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-5.9">RFC4880 §5.9. Literal Data Packet</a>
*/
val filename: String? = findLiteralData()?.fileName
/**
* True, if the sender signals an increased degree of confidentiality by setting the filename of the literal
* data packet to a special value that indicates that the data is intended for your eyes only.
*/
@Deprecated("Reliance on this signaling mechanism is discouraged.")
val isForYourEyesOnly: Boolean = PGPLiteralData.CONSOLE == filename
/**
* Value of the literal data packets modification date field.
* This value can be used to restore the modification date of a decrypted file,
* but since this field is not necessarily part of the signed data, its use is discouraged.
*
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-5.9">RFC4880 §5.9. Literal Data Packet</a>
*/
val modificationDate: Date? = findLiteralData()?.modificationDate
/**
* Value of the format field of the literal data packet.
* This value indicates what format (text, binary data, ...) the data has.
* Since this field is not necessarily part of the signed data of a message, its usage is discouraged.
*
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-5.9">RFC4880 §5.9. Literal Data Packet</a>
*/
val literalDataEncoding: StreamEncoding? = findLiteralData()?.format
/**
* Find the [LiteralData] layer of an OpenPGP message.
* This method might return null, for example for a cleartext signed message without OpenPGP packets.
*
* @return literal data
*/
private fun findLiteralData(): LiteralData? {
// If the message is a non-OpenPGP message with a detached signature, or a Cleartext Signed message,
// we might not have a Literal Data packet.
var nested = message.child ?: return null
while (nested.hasNestedChild()) {
val layer = nested as Layer
nested = checkNotNull(layer.child) {
// Otherwise, we MUST find a Literal Data packet, or else the message is malformed
"Malformed OpenPGP message. Cannot find Literal Data Packet"
}
}
return nested as LiteralData
}
// ################################################################################################################
// ### Message Structure ###
// ################################################################################################################
interface Packet
interface Nested : Packet {
fun hasNestedChild(): Boolean
}
abstract class Layer(
val depth: Int
) : Packet {
init {
if (depth > MAX_LAYER_DEPTH) {
throw MalformedOpenPgpMessageException("Maximum packet nesting depth ($MAX_LAYER_DEPTH) exceeded.")
}
}
val verifiedDetachedSignatures: List<SignatureVerification> = mutableListOf()
val rejectedDetachedSignatures: List<SignatureVerification.Failure> = mutableListOf()
val verifiedOnePassSignatures: List<SignatureVerification> = mutableListOf()
val rejectedOnePassSignatures: List<SignatureVerification.Failure> = mutableListOf()
val verifiedPrependedSignatures: List<SignatureVerification> = mutableListOf()
val rejectedPrependedSignatures: List<SignatureVerification.Failure> = mutableListOf()
/**
* Nested child element of this layer.
* Might be `null`, if this layer does not have a child element
* (e.g. if this is a [LiteralData] packet).
*/
var child: Nested? = null
fun addVerifiedDetachedSignature(signature: SignatureVerification) = apply {
(verifiedDetachedSignatures as MutableList).add(signature)
}
fun addRejectedDetachedSignature(failure: SignatureVerification.Failure) = apply {
(rejectedDetachedSignatures as MutableList).add(failure)
}
fun addVerifiedOnePassSignature(signature: SignatureVerification) = apply {
(verifiedOnePassSignatures as MutableList).add(signature)
}
fun addRejectedOnePassSignature(failure: SignatureVerification.Failure) = apply {
(rejectedOnePassSignatures as MutableList).add(failure)
}
fun addVerifiedPrependedSignature(signature: SignatureVerification) = apply {
(verifiedPrependedSignatures as MutableList).add(signature)
}
fun addRejectedPrependedSignature(failure: SignatureVerification.Failure) = apply {
(rejectedPrependedSignatures as MutableList).add(failure)
}
companion object {
const val MAX_LAYER_DEPTH = 16
}
}
/**
* Outermost OpenPGP Message structure.
*
* @param cleartextSigned whether the message is using the Cleartext Signature Framework
*
* @see <a href="https://www.rfc-editor.org/rfc/rfc4880#section-7">RFC4880 §7. Cleartext Signature Framework</a>
*/
class Message(var cleartextSigned: Boolean = false) : Layer(0) {
fun setCleartextSigned() = apply { cleartextSigned = true }
}
/**
* Literal Data Packet.
*
* @param fileName value of the filename field. An empty String represents no filename.
* @param modificationDate value of the modification date field. The special value `Date(0)` indicates no
* modification date.
* @param format value of the format field.
*/
class LiteralData(
val fileName: String = "",
val modificationDate: Date = Date(0L),
val format: StreamEncoding = StreamEncoding.BINARY
) : Nested {
// A literal data packet MUST NOT have a child element, as its content is the plaintext
override fun hasNestedChild() = false
}
/**
* Compressed Data Packet.
*
* @param algorithm [CompressionAlgorithm] used to compress the packet.
* @param depth nesting depth at which this packet was encountered.
*/
class CompressedData(
val algorithm: CompressionAlgorithm,
depth: Int) : Layer(depth), Nested {
// A compressed data packet MUST have a child element
override fun hasNestedChild() = true
}
/**
* Encrypted Data.
*
* @param algorithm symmetric key algorithm used to encrypt the packet.
* @param depth nesting depth at which this packet was encountered.
*/
class EncryptedData(
val algorithm: SymmetricKeyAlgorithm,
depth: Int
) : Layer(depth), Nested {
/**
* [SessionKey] used to decrypt the packet.
*/
var sessionKey: SessionKey? = null
/**
* List of all recipient key ids to which the packet was encrypted for.
*/
val recipients: List<Long> = mutableListOf()
fun addRecipients(keyIds: List<Long>) = apply {
(recipients as MutableList).addAll(keyIds)
}
/**
* Identifier of the subkey that was used to decrypt the packet (in case of a public key encrypted packet).
*/
var decryptionKey: SubkeyIdentifier? = null
// An encrypted data packet MUST have a child element
override fun hasNestedChild() = true
}
/**
* Iterator that iterates the packet structure from outermost to innermost packet, emitting the results of
* a transformation ([getProperty]) on those packets that match ([matches]) a given criterion.
*
* @param message outermost structure object
*/
private abstract class LayerIterator<O>(@Nonnull message: Message) : Iterator<O> {
private var current: Nested?
var last: Layer? = null
var parent: Message?
init {
parent = message
current = message.child
current?.let {
if (matches(it)) {
last = current as Layer
}
}
}
override fun hasNext(): Boolean {
parent?.let {
if (matches(it)) {
return true
}
}
if (last == null) {
findNext()
}
return last != null
}
override fun next(): O {
parent?.let {
if (matches(it)) {
return getProperty(it).also { parent = null }
}
}
if (last == null) {
findNext()
}
last?.let {
return getProperty(it).also { last = null }
}
throw NoSuchElementException()
}
private fun findNext() {
while (current != null && current is Layer) {
current = (current as Layer).child
if (current != null && matches(current!!)) {
last = current as Layer
break
}
}
}
abstract fun matches(layer: Packet): Boolean
abstract fun getProperty(last: Layer): O
}
}

21
pgpainless-core/src/main/kotlin/org/pgpainless/decryption_verification/OpenPgpMessageInputStream.kt
View file

@ -156,9 +156,9 @@ class OpenPgpMessageInputStream(
val literalData = packetInputStream!!.readLiteralData()
// Extract Metadata
layerMetadata.setChild(LiteralData(
layerMetadata.child = LiteralData(
literalData.fileName, literalData.modificationTime,
StreamEncoding.requireFromCode(literalData.format)))
StreamEncoding.requireFromCode(literalData.format))
nestedInputStream = literalData.inputStream
}
@ -394,7 +394,7 @@ class OpenPgpMessageInputStream(
throwIfUnacceptable(sessionKey.algorithm)
val encryptedData = EncryptedData(sessionKey.algorithm, layerMetadata.depth + 1)
encryptedData.sessionKey = sessionKey
encryptedData.recipients = esks.pkesks.map { it.keyID }
encryptedData.addRecipients(esks.pkesks.map { it.keyID })
LOGGER.debug("Successfully decrypted data with passphrase")
val integrityProtected = IntegrityProtectedInputStream(decrypted, skesk, options)
nestedInputStream = OpenPgpMessageInputStream(integrityProtected, options, encryptedData, policy)
@ -421,7 +421,7 @@ class OpenPgpMessageInputStream(
layerMetadata.depth + 1)
encryptedData.decryptionKey = decryptionKeyId
encryptedData.sessionKey = sessionKey
encryptedData.recipients = esks.pkesks.plus(esks.anonPkesks).map { it.keyID }
encryptedData.addRecipients(esks.pkesks.plus(esks.anonPkesks).map { it.keyID })
LOGGER.debug("Successfully decrypted data with key $decryptionKeyId")
val integrityProtected = IntegrityProtectedInputStream(decrypted, pkesk, options)
nestedInputStream = OpenPgpMessageInputStream(integrityProtected, options, encryptedData, policy)
@ -522,7 +522,7 @@ class OpenPgpMessageInputStream(
private fun collectMetadata() {
if (nestedInputStream is OpenPgpMessageInputStream) {
val child = nestedInputStream as OpenPgpMessageInputStream
layerMetadata.setChild(child.layerMetadata as Nested)
layerMetadata.child = (child.layerMetadata as Nested)
}
}
@ -620,8 +620,7 @@ class OpenPgpMessageInputStream(
} else {
LOGGER.debug("No suitable certificate for verification of signature by key ${keyId.openPgpKeyId()} found.")
detachedSignaturesWithMissingCert.add(SignatureVerification.Failure(
SignatureVerification(signature, null),
SignatureValidationException("Missing verification key.")))
signature, null, SignatureValidationException("Missing verification key.")))
}
}
@ -633,8 +632,7 @@ class OpenPgpMessageInputStream(
} else {
LOGGER.debug("No suitable certificate for verification of signature by key ${keyId.openPgpKeyId()} found.")
prependedSignaturesWithMissingCert.add(SignatureVerification.Failure(
SignatureVerification(signature, null),
SignatureValidationException("Missing verification key")
signature, null, SignatureValidationException("Missing verification key")
))
}
}
@ -695,8 +693,7 @@ class OpenPgpMessageInputStream(
if (!found) {
LOGGER.debug("No suitable certificate for verification of signature by key ${keyId.openPgpKeyId()} found.")
inbandSignaturesWithMissingCert.add(SignatureVerification.Failure(
SignatureVerification(signature, null),
SignatureValidationException("Missing verification key.")
signature, null, SignatureValidationException("Missing verification key.")
))
}
}
@ -890,7 +887,7 @@ class OpenPgpMessageInputStream(
return if (openPgpIn.isAsciiArmored) {
val armorIn = ArmoredInputStreamFactory.get(openPgpIn)
if (armorIn.isClearText) {
(metadata as Message).cleartextSigned = true
(metadata as Message).setCleartextSigned()
OpenPgpMessageInputStream(Type.cleartext_signed, armorIn, options, metadata, policy)
} else {
// Simply consume dearmored OpenPGP message

13
pgpainless-core/src/main/kotlin/org/pgpainless/decryption_verification/SignatureVerification.kt
View file

@ -22,12 +22,12 @@ import org.pgpainless.signature.SignatureUtils
*/
data class SignatureVerification(
val signature: PGPSignature,
val signingKey: SubkeyIdentifier?
val signingKey: SubkeyIdentifier
) {
override fun toString(): String {
return "Signature: ${SignatureUtils.getSignatureDigestPrefix(signature)};" +
" Key: ${signingKey?.toString() ?: "null"};"
" Key: $signingKey;"
}
/**
@ -38,11 +38,16 @@ data class SignatureVerification(
* @param validationException exception that caused the verification to fail
*/
data class Failure(
val signatureVerification: SignatureVerification,
val signature: PGPSignature,
val signingKey: SubkeyIdentifier?,
val validationException: SignatureValidationException
) {
constructor(verification: SignatureVerification, validationException: SignatureValidationException):
this(verification.signature, verification.signingKey, validationException)
override fun toString(): String {
return "$signatureVerification Failure: ${validationException.message}"
return "Signature: ${SignatureUtils.getSignatureDigestPrefix(signature)}; Key: ${signingKey?.toString() ?: "null"}; Failure: ${validationException.message}"
}
}
}

6
pgpainless-core/src/test/java/org/pgpainless/decryption_verification/MessageMetadataTest.java
View file

@ -28,9 +28,9 @@ public class MessageMetadataTest {
// For the sake of testing though, this is okay.
MessageMetadata.Message message = new MessageMetadata.Message();
MessageMetadata.CompressedData compressedData = new MessageMetadata.CompressedData(CompressionAlgorithm.ZIP, message.depth + 1);
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(SymmetricKeyAlgorithm.AES_128, compressedData.depth + 1);
MessageMetadata.EncryptedData encryptedData1 = new MessageMetadata.EncryptedData(SymmetricKeyAlgorithm.AES_256, encryptedData.depth + 1);
MessageMetadata.CompressedData compressedData = new MessageMetadata.CompressedData(CompressionAlgorithm.ZIP, message.getDepth() + 1);
MessageMetadata.EncryptedData encryptedData = new MessageMetadata.EncryptedData(SymmetricKeyAlgorithm.AES_128, compressedData.getDepth() + 1);
MessageMetadata.EncryptedData encryptedData1 = new MessageMetadata.EncryptedData(SymmetricKeyAlgorithm.AES_256, encryptedData.getDepth() + 1);
MessageMetadata.LiteralData literalData = new MessageMetadata.LiteralData();
message.setChild(compressedData);