Fix checkpoint signature verification

Signed-off-by: Appu Goundan <appu@google.com>
sigstore · Dec 3, 2024 · d2e8a8d · d2e8a8d
1 parent f20f4db
commit d2e8a8d
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Showing 7 changed files with 35 additions and 4 deletions.
diff --git a/fuzzing/src/main/java/fuzzing/SignerVerifierFuzzer.java b/fuzzing/src/main/java/fuzzing/SignerVerifierFuzzer.java
@@ -36,8 +36,8 @@ public static void fuzzerTestOneInput(FuzzedDataProvider data) {
       byte[] signature1 = signer.sign(byteArray);
       byte[] signature2 = signer.signDigest(byteArray);
 
-      verifier.verify(byteArray, signature1);
-      verifier.verifyDigest(byteArray, signature2);
+      var unused1 = verifier.verify(byteArray, signature1);
+      var unused2 = verifier.verifyDigest(byteArray, signature2);
     } catch (InvalidKeyException | NoSuchAlgorithmException | SignatureException e) {
       // Known exception
     }

diff --git a/sigstore-java/src/main/java/dev/sigstore/encryption/signers/Verifier.java b/sigstore-java/src/main/java/dev/sigstore/encryption/signers/Verifier.java
@@ -16,6 +16,7 @@
 package dev.sigstore.encryption.signers;
 
 import java.security.*;
+import javax.annotation.CheckReturnValue;
 
 /** A verifier helper that wraps common verification operations for use within this library. */
 public interface Verifier {
@@ -30,6 +31,7 @@ public interface Verifier {
    * @param signature the signature associated with the artifact
    * @return true if the signature is valid, false otherwise
    */
+  @CheckReturnValue
   boolean verify(byte[] artifact, byte[] signature)
       throws NoSuchAlgorithmException, InvalidKeyException, SignatureException;
 
@@ -41,6 +43,7 @@ boolean verify(byte[] artifact, byte[] signature)
    * @param signature the signature associated with the artifact
    * @return true if the signature is valid, false otherwise
    */
+  @CheckReturnValue
   boolean verifyDigest(byte[] artifactDigest, byte[] signature)
       throws NoSuchAlgorithmException, InvalidKeyException, SignatureException;
 }
diff --git a/sigstore-java/src/main/java/dev/sigstore/rekor/client/Checkpoints.java b/sigstore-java/src/main/java/dev/sigstore/rekor/client/Checkpoints.java
@@ -71,6 +71,7 @@ static Checkpoint from(String encoded) throws RekorParseException {
     }
 
     return ImmutableCheckpoint.builder()
+        .signedData(header + "\n")
         .origin(origin)
         .size(size)
         .base64Hash(base64Hash)

diff --git a/sigstore-java/src/main/java/dev/sigstore/rekor/client/RekorEntry.java b/sigstore-java/src/main/java/dev/sigstore/rekor/client/RekorEntry.java
@@ -87,6 +87,9 @@ default Checkpoint parsedCheckpoint() throws RekorParseException {
 
   @Value.Immutable
   interface Checkpoint {
+    /** Signed portion of checkpoint. */
+    String getSignedData();
+
     /** Unique identity for the log. */
     String getOrigin();
 

diff --git a/sigstore-java/src/main/java/dev/sigstore/rekor/client/RekorVerifier.java b/sigstore-java/src/main/java/dev/sigstore/rekor/client/RekorVerifier.java
@@ -20,6 +20,7 @@
 import dev.sigstore.rekor.client.RekorEntry.Checkpoint;
 import dev.sigstore.trustroot.SigstoreTrustedRoot;
 import dev.sigstore.trustroot.TransparencyLog;
+import java.nio.charset.StandardCharsets;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
 import java.security.SignatureException;
@@ -163,9 +164,12 @@ private void verifyCheckpoint(RekorEntry entry, TransparencyLog tlog)
             "Checkpoint key hint did not match provided log public key");
       }
     }
+    var signedData = checkpoint.getSignedData();
     try {
-      Verifiers.newVerifier(tlog.getPublicKey().toJavaPublicKey())
-          .verifyDigest(inclusionRootHash, sig.getSignature());
+      if (!Verifiers.newVerifier(tlog.getPublicKey().toJavaPublicKey())
+          .verify(signedData.getBytes(StandardCharsets.UTF_8), sig.getSignature())) {
+        throw new RekorVerificationException("Checkpoint signature was invalid");
+      }
     } catch (NoSuchAlgorithmException
         | InvalidKeySpecException
         | SignatureException

diff --git a/sigstore-java/src/test/java/dev/sigstore/KeylessVerifierTest.java b/sigstore-java/src/test/java/dev/sigstore/KeylessVerifierTest.java
@@ -86,6 +86,25 @@ public void testVerify_mismatchedArtifactHash() throws Exception {
                 VerificationOptions.empty()));
   }
 
+  @Test
+  public void testVerify_badCheckpointSignature() throws Exception {
+    var bundleFile =
+        Resources.toString(
+            Resources.getResource(
+                "dev/sigstore/samples/bundles/bundle-with-bad-checkpoint-signature.sigstore"),
+            StandardCharsets.UTF_8);
+    var artifact = Resources.getResource("dev/sigstore/samples/bundles/artifact.txt").getPath();
+
+    var verifier = KeylessVerifier.builder().sigstorePublicDefaults().build();
+    Assertions.assertThrows(
+        KeylessVerificationException.class,
+        () ->
+            verifier.verify(
+                Path.of(artifact),
+                Bundle.from(new StringReader(bundleFile)),
+                VerificationOptions.empty()));
+  }
+
   @Test
   public void testVerify_errorsOnDSSEBundle() throws Exception {
     var bundleFile =

diff --git a/...test/resources/dev/sigstore/samples/bundles/bundle-with-bad-checkpoint-signature.sigstore b/...test/resources/dev/sigstore/samples/bundles/bundle-with-bad-checkpoint-signature.sigstore
@@ -0,0 +1 @@
+{"mediaType": "application/vnd.dev.sigstore.bundle+json;version=0.1", "verificationMaterial": {"x509CertificateChain": {"certificates": [{"rawBytes": "MIIIGTCCB5+gAwIBAgIUBPWs4OPN1kte0mUMGZrZ6ozMVRkwCgYIKoZIzj0EAwMwNzEVMBMGA1UEChMMc2lnc3RvcmUuZGV2MR4wHAYDVQQDExVzaWdzdG9yZS1pbnRlcm1lZGlhdGUwHhcNMjMwNzEyMTU1NjM1WhcNMjMwNzEyMTYwNjM1WjAAMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEVr33uVAPA1SpA5w/mmBF9ariW8E7oizIQKqiYfxwSb1zftqZZX045y3tPbRkIWe+t7MUYliQknQ954rDDEASnKOCBr4wgga6MA4GA1UdDwEB/wQEAwIHgDATBgNVHSUEDDAKBggrBgEFBQcDAzAdBgNVHQ4EFgQUx2TNZkruHC2aCdyIXscI8N/8q2owHwYDVR0jBBgwFoAU39Ppz1YkEZb5qNjpKFWixi4YZD8wgaUGA1UdEQEB/wSBmjCBl4aBlGh0dHBzOi8vZ2l0aHViLmNvbS9zaWdzdG9yZS1jb25mb3JtYW5jZS9leHRyZW1lbHktZGFuZ2Vyb3VzLXB1YmxpYy1vaWRjLWJlYWNvbi8uZ2l0aHViL3dvcmtmbG93cy9leHRyZW1lbHktZGFuZ2Vyb3VzLW9pZGMtYmVhY29uLnltbEByZWZzL2hlYWRzL21haW4wOQYKKwYBBAGDvzABAQQraHR0cHM6Ly90b2tlbi5hY3Rpb25zLmdpdGh1YnVzZXJjb250ZW50LmNvbTAfBgorBgEEAYO/MAECBBF3b3JrZmxvd19kaXNwYXRjaDA2BgorBgEEAYO/MAEDBChhZjc4NWI2ZDNiMGZhMGMwYWExMzA1ZmFlZTdjZTYwMzZlOGQ5MGM0MC0GCisGAQQBg78wAQQEH0V4dHJlbWVseSBkYW5nZXJvdXMgT0lEQyBiZWFjb24wSQYKKwYBBAGDvzABBQQ7c2lnc3RvcmUtY29uZm9ybWFuY2UvZXh0cmVtZWx5LWRhbmdlcm91cy1wdWJsaWMtb2lkYy1iZWFjb24wHQYKKwYBBAGDvzABBgQPcmVmcy9oZWFkcy9tYWluMDsGCisGAQQBg78wAQgELQwraHR0cHM6Ly90b2tlbi5hY3Rpb25zLmdpdGh1YnVzZXJjb250ZW50LmNvbTCBpgYKKwYBBAGDvzABCQSBlwyBlGh0dHBzOi8vZ2l0aHViLmNvbS9zaWdzdG9yZS1jb25mb3JtYW5jZS9leHRyZW1lbHktZGFuZ2Vyb3VzLXB1YmxpYy1vaWRjLWJlYWNvbi8uZ2l0aHViL3dvcmtmbG93cy9leHRyZW1lbHktZGFuZ2Vyb3VzLW9pZGMtYmVhY29uLnltbEByZWZzL2hlYWRzL21haW4wOAYKKwYBBAGDvzABCgQqDChhZjc4NWI2ZDNiMGZhMGMwYWExMzA1ZmFlZTdjZTYwMzZlOGQ5MGM0MB0GCisGAQQBg78wAQsEDwwNZ2l0aHViLWhvc3RlZDBeBgorBgEEAYO/MAEMBFAMTmh0dHBzOi8vZ2l0aHViLmNvbS9zaWdzdG9yZS1jb25mb3JtYW5jZS9leHRyZW1lbHktZGFuZ2Vyb3VzLXB1YmxpYy1vaWRjLWJlYWNvbjA4BgorBgEEAYO/MAENBCoMKGFmNzg1YjZkM2IwZmEwYzBhYTEzMDVmYWVlN2NlNjAzNmU4ZDkwYzQwHwYKKwYBBAGDvzABDgQRDA9yZWZzL2hlYWRzL21haW4wGQYKKwYBBAGDvzABDwQLDAk2MzI1OTY4OTcwNwYKKwYBBAGDvzABEAQpDCdodHRwczovL2dpdGh1Yi5jb20vc2lnc3RvcmUtY29uZm9ybWFuY2UwGQYKKwYBBAGDvzABEQQLDAkxMzE4MDQ1NjMwgaYGCisGAQQBg78wARIEgZcMgZRodHRwczovL2dpdGh1Yi5jb20vc2lnc3RvcmUtY29uZm9ybWFuY2UvZXh0cmVtZWx5LWRhbmdlcm91cy1wdWJsaWMtb2lkYy1iZWFjb24vLmdpdGh1Yi93b3JrZmxvd3MvZXh0cmVtZWx5LWRhbmdlcm91cy1vaWRjLWJlYWNvbi55bWxAcmVmcy9oZWFkcy9tYWluMDgGCisGAQQBg78wARMEKgwoYWY3ODViNmQzYjBmYTBjMGFhMTMwNWZhZWU3Y2U2MDM2ZThkOTBjNDAhBgorBgEEAYO/MAEUBBMMEXdvcmtmbG93X2Rpc3BhdGNoMIGBBgorBgEEAYO/MAEVBHMMcWh0dHBzOi8vZ2l0aHViLmNvbS9zaWdzdG9yZS1jb25mb3JtYW5jZS9leHRyZW1lbHktZGFuZ2Vyb3VzLXB1YmxpYy1vaWRjLWJlYWNvbi9hY3Rpb25zL3J1bnMvNTUzMzc0MTQ5Ny9hdHRlbXB0cy8xMIGKBgorBgEEAdZ5AgQCBHwEegB4AHYA3T0wasbHETJjGR4cmWc3AqJKXrjePK3/h4pygC8p7o4AAAGJStGTCwAABAMARzBFAiBCA4jZQP4CwMiWoeS7WMW46QkI4e7OsNH3yVhf5wdBvgIhAPJYxdsi9NqOXVZsEUtCup8m1m/2zG39FTGlgE0MorDFMAoGCCqGSM49BAMDA2gAMGUCMEYWRwI5QJeOwNCuV4tnZ0n5QNlUlP0BtX5V2ZTQLqcQbWtneC7tLptiYgr0Z62UDQIxAO6ItXAH+sbZcsbj08xr3GApM6hjvyTAl39pS3Y3sZwAz8lfQDHNL4eALEo1heAYVg=="}]}, "tlogEntries": [{"logIndex": "27246492", "logId": {"keyId": "wNI9atQGlz+VWfO6LRygH4QUfY/8W4RFwiT5i5WRgB0="}, "kindVersion": {"kind": "hashedrekord", "version": "0.0.1"}, "integratedTime": "1689177396", "inclusionPromise": {"signedEntryTimestamp": "MEUCIQCvkqgP1sCP3BiNYQ+36o79yGXZP5CNeo7OmpmVT6kehgIgegEh0UlZwjMj2KEi/X0nm9cyq+vuG8uOGqG4i//nqgM="}, "inclusionProof": {"logIndex": "23083061", "rootHash": "dauhleYK4YyAdxwwDtR0l0KnSOWZdG2bwqHftlanvcI=", "treeSize": "23083062", "hashes": ["/vK4Da3g7ZhRgme8FxCi8QIBL7DSlwpSwyERyIV+uS8=", "k9N2htTx+7tA55tT0tiB/BO4uqaqSxqTV34ouZgCBWk=", "/ArdEa96pCZQOyrxyKhOHxd2HHEsXBldxS8p23CNIkk=", "5GQbI53IAmYSDjLtEjG0PNzp0hk2+W/eEkCbJlNqTKc=", "O86OnjaE1s+pcHWna1/xdeZ7ubCXgVmtV1f7nWlWYLI=", "Hj0TEef/bwMHB10DPoFLu5+RSLTGJ5YRaQWqwwVIp0s=", "aRtyVlt3GYDP4qaYrEAWqiGqcYDELxyk7Fl3icGXOoA=", "ZdynT2d4F3NFQNBurFDaZBoYMVRjbQjlTnSL1hL67+s=", "3VHoQOiS1wCTrX4dseLeo9UDNMc0XTYORE0i/Entn14=", "rXEsmEJN4PEoTU8US4qVtdIsGB1MCiRlGOepoiC99kM="], "checkpoint": {"envelope": "rekor.sigstore.dev - 2605736670972794746\n23083062\ndauhleYK4YyAdxwwDtR0l0KnSOWZdG2bwqHftlanvcI=\nTimestamp: 1689177396617352539\n\n\u2014 rekor.sigstore.dev wNI9ajBFAiBxaGyEtxkzZLkaCSEJqFuSS3dJjEZCNiyByVs1CNVQ8gIhAOoNnXtmMtTctV2oRnSRUZAo4EWUYPK/vBsqOzAU6TMs\n"}}, "canonicalizedBody": 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Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
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