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Code Issues Releases Wiki Activity

Work on getting signature verification to function again

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This commit is contained in:
Paul Schaub 2022-09-14 19:29:47 +02:00
parent 39fa8ad291
commit 48e83420a3
2 changed files with 116 additions and 36 deletions
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145
pgpainless-core/src/main/java/org/pgpainless/decryption_verification/OpenPgpMessageInputStream.java
View file

@ -30,19 +30,24 @@ import org.pgpainless.algorithm.EncryptionPurpose;
import org.pgpainless.algorithm.OpenPgpPacket;
import org.pgpainless.decryption_verification.automaton.InputAlphabet;
import org.pgpainless.decryption_verification.automaton.PDA;
import org.pgpainless.decryption_verification.automaton.StackAlphabet;
import org.pgpainless.exception.MalformedOpenPgpMessageException;
import org.pgpainless.exception.MessageNotIntegrityProtectedException;
import org.pgpainless.exception.MissingDecryptionMethodException;
import org.pgpainless.implementation.ImplementationFactory;
import org.pgpainless.key.info.KeyRingInfo;
import org.pgpainless.key.protection.SecretKeyRingProtector;
import org.pgpainless.key.protection.UnlockSecretKey;
import org.pgpainless.signature.consumer.DetachedSignatureCheck;
import org.pgpainless.util.Passphrase;
import org.pgpainless.util.Tuple;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
public class OpenPgpMessageInputStream extends InputStream {
@ -52,12 +57,12 @@ public class OpenPgpMessageInputStream extends InputStream {
protected final BCPGInputStream bcpgIn;
protected InputStream in;
private List<PGPSignature> signatures = new ArrayList<>();
private List<PGPOnePassSignature> onePassSignatures = new ArrayList<>();
private boolean closed = false;
private Signatures signatures = new Signatures();
public OpenPgpMessageInputStream(InputStream inputStream, ConsumerOptions options)
throws IOException, PGPException {
this.options = options;
// TODO: Use BCPGInputStream.wrap(inputStream);
if (inputStream instanceof BCPGInputStream) {
this.bcpgIn = (BCPGInputStream) inputStream;
@ -65,41 +70,61 @@ public class OpenPgpMessageInputStream extends InputStream {
this.bcpgIn = new BCPGInputStream(inputStream);
}
walk();
this.options = options;
this.signatures.addDetachedSignatures(options.getDetachedSignatures());
consumePackets();
}
private void walk() throws IOException, PGPException {
loop: while (true) {
int tag = bcpgIn.nextPacketTag();
if (tag == -1) {
break loop;
}
/**
* This method consumes OpenPGP packets from the current {@link BCPGInputStream}.
* Once it reaches a "nested" OpenPGP packet (Literal Data, Compressed Data, Encrypted Data), it sets <pre>in</pre>
* to the nested stream and breaks the loop.
* The nested stream is either a simple {@link InputStream} (in case of Literal Data), or another
* {@link OpenPgpMessageInputStream} in case of Compressed and Encrypted Data.
*
* @throws IOException
* @throws PGPException
*/
private void consumePackets()
throws IOException, PGPException {
int tag;
loop: while ((tag = bcpgIn.nextPacketTag()) != -1) {
OpenPgpPacket nextPacket = OpenPgpPacket.requireFromTag(tag);
switch (nextPacket) {
// Literal Data - the literal data content is the new input stream
case LIT:
automaton.next(InputAlphabet.LiteralData);
PGPLiteralData literalData = new PGPLiteralData(bcpgIn);
in = literalData.getDataStream();
break loop;
// Compressed Data - the content contains another OpenPGP message
case COMP:
automaton.next(InputAlphabet.CompressedData);
PGPCompressedData compressedData = new PGPCompressedData(bcpgIn);
in = new OpenPgpMessageInputStream(compressedData.getDataStream(), options);
break loop;
// One Pass Signatures
case OPS:
automaton.next(InputAlphabet.OnePassSignatures);
readOnePassSignatures();
signatures.addOnePassSignatures(readOnePassSignatures());
break;
// Signatures - either prepended to the message, or corresponding to the One Pass Signatures
case SIG:
automaton.next(InputAlphabet.Signatures);
readSignatures();
PGPSignatureList signatureList = readSignatures();
if (automaton.peekStack() == StackAlphabet.ops) {
signatures.addOnePassCorrespondingSignatures(signatureList);
} else {
signatures.addPrependedSignatures(signatureList);
}
break;
// Encrypted Data (ESKs and SED/SEIPD are parsed the same by BC)
case PKESK:
case SKESK:
case SED:
@ -200,6 +225,7 @@ public class OpenPgpMessageInputStream extends InputStream {
bcpgIn.readPacket(); // skip marker packet
break;
// Key Packets are illegal in this context
case SK:
case PK:
case SSK:
@ -209,13 +235,14 @@ public class OpenPgpMessageInputStream extends InputStream {
case UATTR:
case MOD:
break;
throw new MalformedOpenPgpMessageException("Unexpected Packet in Stream: " + nextPacket);
// Experimental Packets are not supported
case EXP_1:
case EXP_2:
case EXP_3:
case EXP_4:
break;
throw new MalformedOpenPgpMessageException("Unsupported Packet in Stream: " + nextPacket);
}
}
}
@ -247,7 +274,7 @@ public class OpenPgpMessageInputStream extends InputStream {
return null;
}
private void readOnePassSignatures() throws IOException {
private PGPOnePassSignatureList readOnePassSignatures() throws IOException {
ByteArrayOutputStream buf = new ByteArrayOutputStream();
BCPGOutputStream bcpgOut = new BCPGOutputStream(buf);
int tag = bcpgIn.nextPacketTag();
@ -262,12 +289,10 @@ public class OpenPgpMessageInputStream extends InputStream {
PGPObjectFactory objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(buf.toByteArray());
PGPOnePassSignatureList signatureList = (PGPOnePassSignatureList) objectFactory.nextObject();
for (PGPOnePassSignature ops : signatureList) {
onePassSignatures.add(ops);
}
return signatureList;
}
private void readSignatures() throws IOException {
private PGPSignatureList readSignatures() throws IOException {
ByteArrayOutputStream buf = new ByteArrayOutputStream();
BCPGOutputStream bcpgOut = new BCPGOutputStream(buf);
int tag = bcpgIn.nextPacketTag();
@ -283,9 +308,7 @@ public class OpenPgpMessageInputStream extends InputStream {
PGPObjectFactory objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(buf.toByteArray());
PGPSignatureList signatureList = (PGPSignatureList) objectFactory.nextObject();
for (PGPSignature signature : signatureList) {
signatures.add(signature);
}
return signatureList;
}
@Override
@ -298,15 +321,17 @@ public class OpenPgpMessageInputStream extends InputStream {
//
}
}
if (r == -1) {
if (r != -1) {
byte b = (byte) r;
signatures.update(b);
} else {
if (in instanceof OpenPgpMessageInputStream) {
System.out.println("Read -1: close " + automaton);
in.close();
in = null;
} else {
try {
System.out.println("Walk " + automaton);
walk();
consumePackets();
} catch (PGPException e) {
throw new RuntimeException(e);
}
@ -317,25 +342,24 @@ public class OpenPgpMessageInputStream extends InputStream {
@Override
public void close() throws IOException {
if (in == null) {
System.out.println("Close " + automaton);
automaton.next(InputAlphabet.EndOfSequence);
automaton.assertValid();
if (closed) {
return;
}
try {
if (in != null) {
in.close();
in = null;
// Nested streams (except LiteralData) need to be closed.
in = null; // TODO: Collect result of in before nulling
if (automaton.getState() != PDA.State.LiteralMessage) {
automaton.next(InputAlphabet.EndOfSequence);
automaton.assertValid();
}
} catch (IOException e) {
//
} else {
automaton.next(InputAlphabet.EndOfSequence);
automaton.assertValid();
}
super.close();
closed = true;
}
private static class SortedESKs {
@ -369,4 +393,53 @@ public class OpenPgpMessageInputStream extends InputStream {
return esks;
}
}
private static class Signatures {
List<PGPSignature> detachedSignatures = new ArrayList<>();
List<PGPSignature> prependedSignatures = new ArrayList<>();
List<PGPOnePassSignature> onePassSignatures = new ArrayList<>();
List<PGPSignature> correspondingSignatures = new ArrayList<>();
void addDetachedSignatures(Collection<PGPSignature> signatures) {
this.detachedSignatures.addAll(signatures);
}
void addPrependedSignatures(PGPSignatureList signatures) {
for (PGPSignature signature : signatures) {
this.prependedSignatures.add(signature);
}
}
void addOnePassSignatures(PGPOnePassSignatureList signatures) {
for (PGPOnePassSignature ops : signatures) {
this.onePassSignatures.add(ops);
}
}
void addOnePassCorrespondingSignatures(PGPSignatureList signatures) {
for (PGPSignature signature : signatures) {
correspondingSignatures.add(signature);
}
}
public void update(byte b) {
/**
for (PGPSignature prepended : prependedSignatures) {
prepended.update(b);
}
for (PGPOnePassSignature ops : onePassSignatures) {
ops.update(b);
}
for (PGPSignature detached : detachedSignatures) {
detached.update(b);
}
*/
}
public void finish() {
for (PGPSignature detached : detachedSignatures) {
}
}
}
}

7
pgpainless-core/src/main/java/org/pgpainless/decryption_verification/automaton/PDA.java
View file

@ -202,6 +202,13 @@ public class PDA {
return state;
}
public StackAlphabet peekStack() {
if (stack.isEmpty()) {
return null;
}
return stack.peek();
}
/**
* Return true, if the PDA is in a valid state (the OpenPGP message is valid).
*