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Security: fix(spanner), implement look-ahead deserialization filtering in CloudClientExecutor #12308

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Security: fix(spanner), implement look-ahead deserialization filtering in CloudClientExecutor #12308

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19736ce
security: fix insecure deserialization in Spanner executor
missoum1307 Mar 30, 2026
27e5541
chore: address code review feedback on casing and exception handling
missoum1307 Mar 30, 2026
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40 changes: 36 additions & 4 deletions ...spanner-executor/src/main/java/com/google/cloud/executor/spanner/CloudClientExecutor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -166,17 +166,22 @@
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InvalidClassException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.io.Serializable;
import java.math.BigDecimal;
import java.text.ParseException;
import java.time.Duration;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
Expand Down Expand Up @@ -3795,11 +3800,38 @@ private static com.google.spanner.v1.Type cloudTypeToTypeProto(@Nonnull Type clo
}
}

/** Define the Allowlist: ONLY allow specific, safe internal classes */
private static final Set<String> ALLOWED_CLASSES = new HashSet<>(Arrays.asList(
"com.google.cloud.spanner.PartitionOptions",
"com.google.cloud.spanner.Partition",
"com.google.cloud.spanner.BatchTransactionId",
"java.util.ArrayList",
"java.lang.Number",
"java.lang.Long",
"java.lang.Integer"
));

/** Unmarshall ByteString to serializable object. */
private <T extends Serializable> T unmarshall(ByteString input)
throws IOException, ClassNotFoundException {
ObjectInputStream objectInputStream = new ObjectInputStream(input.newInput());
return (T) objectInputStream.readObject();
private <T extends Serializable> T unmarshall(ByteString input) throws IOException, ClassNotFoundException {
try (InputStream is = input.newInput();
ObjectInputStream ois = new SecureObjectInputStream(is)) {
return (T) ois.readObject();
}
}

/** The "Look-ahead" Filter */
private static class SecureObjectInputStream extends ObjectInputStream {
public SecureObjectInputStream(InputStream in) throws IOException {
super(in);
}

@Override
protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
if (!ALLOWED_CLASSES.contains(desc.getName())) {
throw new InvalidClassException("Unauthorized deserialization attempt: ", desc.getName());
}
return super.resolveClass(desc);
}
}

/** Marshall a serializable object into ByteString. */
Expand Down
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