Fuzzer tests

pgpainless-core/src/main/kotlin/org/pgpainless/signature/SignatureUtils.kt

@@ -8,6 +8,7 @@ import java.io.IOException
 import java.io.InputStream
 import java.util.*
 import openpgp.plusSeconds
+import org.bouncycastle.bcpg.UnsupportedPacketVersionException
 import org.bouncycastle.bcpg.sig.KeyExpirationTime
 import org.bouncycastle.openpgp.*
 import org.bouncycastle.util.encoders.Hex
@@ -151,37 +152,46 @@ class SignatureUtils {
          */
         @JvmStatic
         fun readSignatures(inputStream: InputStream, maxIterations: Int): List<PGPSignature> {
-            val signatures = mutableListOf<PGPSignature>()
-            val pgpIn = ArmorUtils.getDecoderStream(inputStream)
-            val objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(pgpIn)
+            try {
+                val signatures = mutableListOf<PGPSignature>()
+                val pgpIn = ArmorUtils.getDecoderStream(inputStream)
+                val objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(pgpIn)
 
-            var i = 0
-            var nextObject: Any? = null
-            while (i++ < maxIterations &&
-                objectFactory.nextObject().also { nextObject = it } != null) {
-                // Since signatures are indistinguishable from randomness, there is no point in
-                // having them compressed,
-                //  except for an attacker who is trying to exploit flaws in the decompression
-                // algorithm.
-                //  Therefore, we ignore compressed data packets without attempting decompression.
-                if (nextObject is PGPCompressedData) {
-                    // getInputStream() does not do decompression, contrary to getDataStream().
-                    Streams.drain(
-                        (nextObject as PGPCompressedData)
-                            .inputStream) // Skip packet without decompressing
+                var i = 0
+                var nextObject: Any? = null
+                while (i++ < maxIterations &&
+                    objectFactory.nextObject().also { nextObject = it } != null) {
+                    // Since signatures are indistinguishable from randomness, there is no point in
+                    // having them compressed,
+                    //  except for an attacker who is trying to exploit flaws in the decompression
+                    // algorithm.
+                    //  Therefore, we ignore compressed data packets without attempting decompression.
+                    if (nextObject is PGPCompressedData) {
+                        // getInputStream() does not do decompression, contrary to getDataStream().
+                        Streams.drain(
+                            (nextObject as PGPCompressedData)
+                                .inputStream
+                        ) // Skip packet without decompressing
+                    }
+
+                    if (nextObject is PGPSignatureList) {
+                        signatures.addAll(nextObject as PGPSignatureList)
+                    }
+
+                    if (nextObject is PGPSignature) {
+                        signatures.add(nextObject as PGPSignature)
+                    }
                 }
 
-                if (nextObject is PGPSignatureList) {
-                    signatures.addAll(nextObject as PGPSignatureList)
-                }
-
-                if (nextObject is PGPSignature) {
-                    signatures.add(nextObject as PGPSignature)
-                }
+                pgpIn.close()
+                return signatures.toList()
+            } catch (e: UnsupportedPacketVersionException) {
+                throw PGPException("Unsupported packet version encountered.", e)
+            } catch (e: ClassCastException) {
+                throw PGPException("Unexpected packet encountered.", e)
+            } catch (e: IllegalArgumentException) {
+                throw PGPException("Malformed packet encountered.", e)
             }
-
-            pgpIn.close()
-            return signatures.toList()
         }
 
         /**

pgpainless-sop/src/main/kotlin/org/pgpainless/sop/DetachedVerifyImpl.kt

@@ -29,8 +29,11 @@ class DetachedVerifyImpl : DetachedVerify {
     override fun data(data: InputStream): List<Verification> {
         try {
             val verificationStream =
-                PGPainless.decryptAndOrVerify().onInputStream(data).withOptions(options)
-
+                try {
+                    PGPainless.decryptAndOrVerify().onInputStream(data).withOptions(options)
+                } catch (e: RuntimeException) {
+                    throw SOPGPException.BadData(e)
+                }
             Streams.drain(verificationStream)
             verificationStream.close()
 

pgpainless-sop/src/test/java/org/pgpainless/sop/fuzzing/AsciiArmorFuzzTest.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2025 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.sop.fuzzing;
 
 import com.code_intelligence.jazzer.api.FuzzedDataProvider;

pgpainless-sop/src/test/java/org/pgpainless/sop/fuzzing/ParseCertFuzzTest.java

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2025 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
 package org.pgpainless.sop.fuzzing;
 
 import com.code_intelligence.jazzer.api.FuzzedDataProvider;

pgpainless-sop/src/test/java/org/pgpainless/sop/fuzzing/SignatureFuzzTest.java

@@ -0,0 +1,96 @@
+// SPDX-FileCopyrightText: 2025 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.sop.fuzzing;
+
+import com.code_intelligence.jazzer.api.FuzzedDataProvider;
+import com.code_intelligence.jazzer.junit.FuzzTest;
+import org.pgpainless.sop.SOPImpl;
+import sop.SOP;
+import sop.Verification;
+import sop.exception.SOPGPException;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+
+public class SignatureFuzzTest {
+
+    private final SOP sop = new SOPImpl();
+    private final byte[] data = "Hello, World!\n".getBytes(StandardCharsets.UTF_8);
+
+    private final String key = "-----BEGIN PGP PRIVATE KEY BLOCK-----\n" +
+            "Comment: D7BC FF6B B105 40D9 87F9  CB6E 542D C9F6 FCAE AD63\n" +
+            "Comment: Alice <alice@pgpainless.org>\n" +
+            "\n" +
+            "lFgEaGzu+BYJKwYBBAHaRw8BAQdAlqjB241N44drAJvxa3wx0uRb5bxuVNXrCwPZ\n" +
+            "yf4Qg+MAAQCpACcGmoOPZISRbMjRzI/0Wf5iIZwp7r9huzLe6NToBRFxtBxBbGlj\n" +
+            "ZSA8YWxpY2VAcGdwYWlubGVzcy5vcmc+wpUEExYKAEcFgmhs7vgJEFQtyfb8rq1j\n" +
+            "FiEE17z/a7EFQNmH+ctuVC3J9vyurWMCngECmwEFFgIDAQAECwkIBwUVCgkICwWJ\n" +
+            "CWYBfwKZAQAA1SMBAIuffSIKKkG73rWInDrfV6G0kCh/uP7Qf3Jh4A+x5BrvAP42\n" +
+            "KANAmmLmDVsPGWEPEAlCAJFwKZvHzvYsk8dEFNZEDJxYBGhs7vgWCSsGAQQB2kcP\n" +
+            "AQEHQOPChGD0z51fOsnFswJPNmhzxdhZHuXCxbEJ+/5WhU9QAAEA3i0J/Vbyhj92\n" +
+            "kd8gsjLUIkbDHGGDb/vfRCgmRAySF1MOL8LAFQQYFgoAfQWCaGzu+AKeAQKbAgUW\n" +
+            "AgMBAAQLCQgHBRUKCQgLXyAEGRYKAAYFgmhs7vgACgkQIvV9b29BRNSV1AEAtywX\n" +
+            "h7bdVq0597D0JfASIvo/ksyHsTyf/JRVH6M0Gv0A/RvFJnVRt1EitamD8i2mX2H3\n" +
+            "yC2lP2t1WzTafT7GzkYMAAoJEFQtyfb8rq1jhRABAIb/GkyCOlU02zfDMd5UHQ4J\n" +
+            "EpexaSodCvrGcQMA5t2nAPsEPXQOl1AOdJoc/sICsVAi4DvxohelpWJ19ZUy7WYQ\n" +
+            "CZxdBGhs7vgSCisGAQQBl1UBBQEBB0BeCegzdBr3B6+q3IBjkzNXPfLopNi2d+sL\n" +
+            "9hcbV9ztDgMBCAcAAP9hFCttDV8qWyven96rQ0WKGfVo1bKp2EZHGUR7tIScWA9P\n" +
+            "wnUEGBYKAB0Fgmhs7vgCngECmwwFFgIDAQAECwkIBwUVCgkICwAKCRBULcn2/K6t\n" +
+            "Y7GuAP9Kf1Ec1GJmZ99UHsgiN60os+6adMLj4G2ASiIbNSDvKgD9F/VLFIb/eN7k\n" +
+            "JQp3E5C15x5pMMKEI/rjwdrKmYH3aAw=\n" +
+            "=hnEg\n" +
+            "-----END PGP PRIVATE KEY BLOCK-----";
+    private final String cert = "-----BEGIN PGP PUBLIC KEY BLOCK-----\n" +
+            "Comment: D7BC FF6B B105 40D9 87F9  CB6E 542D C9F6 FCAE AD63\n" +
+            "Comment: Alice <alice@pgpainless.org>\n" +
+            "\n" +
+            "mDMEaGzu+BYJKwYBBAHaRw8BAQdAlqjB241N44drAJvxa3wx0uRb5bxuVNXrCwPZ\n" +
+            "yf4Qg+O0HEFsaWNlIDxhbGljZUBwZ3BhaW5sZXNzLm9yZz7ClQQTFgoARwWCaGzu\n" +
+            "+AkQVC3J9vyurWMWIQTXvP9rsQVA2Yf5y25ULcn2/K6tYwKeAQKbAQUWAgMBAAQL\n" +
+            "CQgHBRUKCQgLBYkJZgF/ApkBAADVIwEAi599IgoqQbvetYicOt9XobSQKH+4/tB/\n" +
+            "cmHgD7HkGu8A/jYoA0CaYuYNWw8ZYQ8QCUIAkXApm8fO9iyTx0QU1kQMuDMEaGzu\n" +
+            "+BYJKwYBBAHaRw8BAQdA48KEYPTPnV86ycWzAk82aHPF2Fke5cLFsQn7/laFT1DC\n" +
+            "wBUEGBYKAH0Fgmhs7vgCngECmwIFFgIDAQAECwkIBwUVCgkIC18gBBkWCgAGBYJo\n" +
+            "bO74AAoJECL1fW9vQUTUldQBALcsF4e23VatOfew9CXwEiL6P5LMh7E8n/yUVR+j\n" +
+            "NBr9AP0bxSZ1UbdRIrWpg/Itpl9h98gtpT9rdVs02n0+xs5GDAAKCRBULcn2/K6t\n" +
+            "Y4UQAQCG/xpMgjpVNNs3wzHeVB0OCRKXsWkqHQr6xnEDAObdpwD7BD10DpdQDnSa\n" +
+            "HP7CArFQIuA78aIXpaVidfWVMu1mEAm4OARobO74EgorBgEEAZdVAQUBAQdAXgno\n" +
+            "M3Qa9wevqtyAY5MzVz3y6KTYtnfrC/YXG1fc7Q4DAQgHwnUEGBYKAB0Fgmhs7vgC\n" +
+            "ngECmwwFFgIDAQAECwkIBwUVCgkICwAKCRBULcn2/K6tY7GuAP9Kf1Ec1GJmZ99U\n" +
+            "HsgiN60os+6adMLj4G2ASiIbNSDvKgD9F/VLFIb/eN7kJQp3E5C15x5pMMKEI/rj\n" +
+            "wdrKmYH3aAw=\n" +
+            "=4uX6\n" +
+            "-----END PGP PUBLIC KEY BLOCK-----";
+
+    @FuzzTest(
+            maxDuration = "60s"
+    )
+    public void verifyFuzzedSig(FuzzedDataProvider provider) throws IOException {
+        byte[] sig = provider.consumeBytes(1024);
+        if (sig.length == 0) {
+            return;
+        }
+
+        try {
+            List<Verification> verifs = sop.verify()
+                    .cert(cert.getBytes(StandardCharsets.UTF_8))
+                    .signatures(sig)
+                    .data(data);
+
+            if (verifs.isEmpty()) {
+                return;
+            }
+
+            for (Verification v : verifs) {
+                System.out.println(v.toString());
+            }
+        } catch (SOPGPException.NoSignature e) {
+            // ignore
+        } catch (SOPGPException.BadData e) {
+            // expected
+        }
+    }
+}

pgpainless-sop/src/test/resources/org/pgpainless/sop/fuzzing/ParseCertFuzzTestInputs/parseOpenPGPCert/crash-94d4f79102352b762d29a2596cec0a16fb4f6a61

@@ -0,0 +1 @@
+xjsFwxylML8M9MlS

pgpainless-sop/src/test/resources/org/pgpainless/sop/fuzzing/ParseCertFuzzTestInputs/parseOpenPGPCert/crash-f76fa673913fd9409423d16fc3593596cbf71023

@@ -0,0 +1 @@
+xjx

pgpainless-sop/src/test/resources/org/pgpainless/sop/fuzzing/SignatureFuzzTestInputs/verifyFuzzedSig/crash-5a8ca84c7d4d9b055f05c55b1f707f223979d387

@@ -0,0 +1 @@
+

pgpainless-sop/src/test/resources/org/pgpainless/sop/fuzzing/SignatureFuzzTestInputs/verifyFuzzedSig/crash-a4dc44449d64decbb5459f8572b54af63a4eb4f8

@@ -0,0 +1 @@
+00000000000000000000000000000000000000000000000000000000000000

pgpainless-sop/src/test/resources/org/pgpainless/sop/fuzzing/SignatureFuzzTestInputs/verifyFuzzedSig/crash-bea7acca1916ad2e8fcc55c6c22372fa8db47f10

@@ -0,0 +1 @@
+<EFBFBD>

pgpainless-sop/src/test/resources/org/pgpainless/sop/fuzzing/SignatureFuzzTestInputs/verifyFuzzedSig/crash-c000a51366616d33f9df61c9260fba450f9e2e7c

@@ -0,0 +1 @@
+<EFBFBD>

pgpainless-sop/src/test/resources/org/pgpainless/sop/fuzzing/SignatureFuzzTestInputs/verifyFuzzedSig/crash-f03f6f5bb897abe1c95a7058ebfb101855207798

@@ -0,0 +1 @@
+覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧覧#

pgpainless-sop/src/test/resources/org/pgpainless/sop/fuzzing/SignatureFuzzTestInputs/verifyFuzzedSig/sig.asc

@@ -0,0 +1,7 @@
+-----BEGIN PGP SIGNATURE-----
+
+wnUEABYKACcFgmhs7vgJECL1fW9vQUTUFiEELgSiuyj9W99u41BmIvV9b29BRNQA
+ALkiAQDRulwayys9tufqrCg+AGCTyBp0SZT9PBOiCk2iZSb4zgEAvc3R88D3LI0C
+kmchJW/WW7JGsmrwO4EZIBu1alzkggk=
+=w4js
+-----END PGP SIGNATURE-----