Harden XML parsing, serialization, and randomness#3075
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This commit introduces several security hardening improvements across the codebase: 1. XML Processing: Hardened `TransformerFactory` and `SchemaFactory` instantiations in `EppMessage.java` by explicitly enabling `XMLConstants.FEATURE_SECURE_PROCESSING` and disabling external schema access. 2. Randomness: Replaced instances of `java.util.Random` with `java.security.SecureRandom` in `SelfSignedCaCertificate.java` for stronger entropy. (Added documentation in `ProxyModule.java` explaining why `java.util.Random` is intentionally retained there for metrics sampling). 3. Deserialization: Hardened `SerializeUtils.java` by injecting an `ObjectInputFilter` into the `ObjectInputStream`, restricting deserialization strictly to expected `google.registry` classes and standard Java collections.
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This commit introduces several security hardening improvements across the codebase:
TransformerFactoryandSchemaFactoryinstantiations inEppMessage.javaby explicitly enablingXMLConstants.FEATURE_SECURE_PROCESSINGand disabling external schema access.java.util.Randomwithjava.security.SecureRandominSelfSignedCaCertificate.javafor stronger entropy. (Added documentation inProxyModule.javaexplaining whyjava.util.Randomis intentionally retained there for metrics sampling).SerializeUtils.javaby injecting anObjectInputFilterinto theObjectInputStream, restricting deserialization strictly to expectedgoogle.registryclasses and standard Java collections.This change is