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Code Issues Releases Wiki Activity

SOP: Implement basic signature verification

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This commit is contained in:
Paul Schaub 2020-12-16 17:31:27 +01:00
parent e07998f99d
commit eb9587163d
2 changed files with 93 additions and 5 deletions
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8
pgpainless-sop/src/main/java/org/pgpainless/sop/PGPainlessCLI.java
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@ -1,9 +1,6 @@
package org.pgpainless.sop; package org.pgpainless.sop;
import org.pgpainless.sop.commands.ExtractCert; import org.pgpainless.sop.commands.*;
import org.pgpainless.sop.commands.GenerateKey;
import org.pgpainless.sop.commands.Sign;
import org.pgpainless.sop.commands.Version;
import picocli.CommandLine; import picocli.CommandLine;
@CommandLine.Command( @CommandLine.Command(
@ -11,7 +8,8 @@ import picocli.CommandLine;
Version.class, Version.class,
GenerateKey.class, GenerateKey.class,
ExtractCert.class, ExtractCert.class,
Sign.class Sign.class,
Verify.class
} }
) )
public class PGPainlessCLI implements Runnable { public class PGPainlessCLI implements Runnable {

90
pgpainless-sop/src/main/java/org/pgpainless/sop/commands/Verify.java Normal file
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@ -0,0 +1,90 @@
package org.pgpainless.sop.commands;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPPublicKeyRing;
import org.bouncycastle.openpgp.PGPSignature;
import org.bouncycastle.util.io.Streams;
import org.pgpainless.PGPainless;
import org.pgpainless.decryption_verification.DecryptionStream;
import org.pgpainless.decryption_verification.OpenPgpMetadata;
import org.pgpainless.key.OpenPgpV4Fingerprint;
import picocli.CommandLine;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;
@CommandLine.Command(name = "verify")
public class Verify implements Runnable {
@CommandLine.Parameters(index = "0", description = "The detached signature")
File signature;
@CommandLine.Parameters(index = "1..*")
File[] certs;
TimeZone tz = TimeZone.getTimeZone("UTC");
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm'Z'");
@Override
public void run() {
df.setTimeZone(tz);
if (certs.length == 0) {
System.out.println("No certificates supplied.");
System.exit(19);
}
Map<File, PGPPublicKeyRing> publicKeys = new HashMap<>();
for (File cert : certs) {
try(FileInputStream in = new FileInputStream(cert)) {
publicKeys.put(cert, PGPainless.readKeyRing().publicKeyRing(in));
} catch (IOException e) {
e.printStackTrace();
}
}
try(FileInputStream sigIn = new FileInputStream(signature)) {
DecryptionStream verifier = PGPainless.decryptAndOrVerify()
.onInputStream(System.in)
.doNotDecrypt()
.verifyDetachedSignature(sigIn)
.verifyWith(new HashSet<>(publicKeys.values()))
.ignoreMissingPublicKeys()
.build();
ByteArrayOutputStream out = new ByteArrayOutputStream();
Streams.pipeAll(verifier, out);
verifier.close();
OpenPgpMetadata metadata = verifier.getResult();
for (OpenPgpV4Fingerprint sigKeyFp : metadata.getVerifiedSignatures().keySet()) {
PGPSignature signature = metadata.getVerifiedSignatures().get(sigKeyFp);
for (File file : certs) {
// Search signing key ring
PGPPublicKeyRing publicKeyRing = publicKeys.get(file);
if (publicKeyRing.getPublicKey(sigKeyFp.getKeyId()) == null) {
continue;
}
String utcSigDate = df.format(signature.getCreationTime());
OpenPgpV4Fingerprint primaryKeyFp = new OpenPgpV4Fingerprint(publicKeyRing);
System.out.println(utcSigDate + " " + sigKeyFp.toString() + " " + primaryKeyFp.toString() +
" signed by " + file.getName());
}
}
if (metadata.getVerifiedSignatures().isEmpty()) {
System.out.println("Signature validation failed.");
System.exit(3);
}
} catch (IOException | PGPException e) {
e.printStackTrace();
}
}
}