checker-ns-restrictions

Authoritative nameserver security restrictions checker for happyDomain.

For each nameserver of an abstract.Origin or abstract.NSOnlyOrigin service, this checker verifies common security misconfigurations:

Check	Severity on failure
AXFR zone transfer refused	CRITICAL
IXFR zone transfer refused	WARNING
Recursion not available (RA)	WARNING
ANY query handling (RFC 8482)	WARNING
Authoritative answer (AA bit)	INFO

The checker resolves each NS host, then runs the five DNS probes against every returned IPv4/IPv6 address. IPv6 targets are skipped gracefully if the host has no IPv6 connectivity.

Usage

Standalone HTTP server

make
./checker-ns-restrictions -listen :8080

The server exposes the standard happyDomain external checker protocol (/health, /collect, /evaluate, /definition).

Docker

make docker
docker run -p 8080:8080 happydomain/checker-ns-restrictions

happyDomain plugin

make plugin
# produces checker-ns-restrictions.so, loadable by happyDomain as a Go plugin

The plugin exposes a NewCheckerPlugin symbol returning the checker definition and observation provider, which happyDomain registers in its global registries at load time.

Versioning

The binary, plugin, and Docker image embed a version string overridable at build time:

make CHECKER_VERSION=1.2.3
make plugin CHECKER_VERSION=1.2.3
make docker CHECKER_VERSION=1.2.3

License

This project does not depend on the happyDomain core repository: the few host types it needs (ServiceMessage, abstract.Origin, abstract.NSOnlyOrigin) are mirrored as minimal local copies of their JSON wire shapes. It only depends on checker-sdk-go (Apache 2.0) and miekg/dns (BSD 3-Clause).