feat: recursive DNS + DNSSEC + TCP fallback (#17)
* feat: recursive resolution + full DNSSEC validation Numa becomes a true DNS resolver — resolves from root nameservers with complete DNSSEC chain-of-trust verification. Recursive resolution: - Iterative RFC 1034 from configurable root hints (13 default) - CNAME chasing (depth 8), referral following (depth 10) - A+AAAA glue extraction, IPv6 nameserver support - TLD priming: NS + DS + DNSKEY for 34 gTLDs + EU ccTLDs - Config: mode = "recursive" in [upstream], root_hints, prime_tlds DNSSEC (all 4 phases): - EDNS0 OPT pseudo-record (DO bit, 1232 payload per DNS Flag Day 2020) - DNSKEY, DS, RRSIG, NSEC, NSEC3 record types with wire read/write - Signature verification via ring: RSA/SHA-256, ECDSA P-256, Ed25519 - Chain-of-trust: zone DNSKEY → parent DS → root KSK (key tag 20326) - DNSKEY RRset self-signature verification (RRSIG(DNSKEY) by KSK) - RRSIG expiration/inception time validation - NSEC: NXDOMAIN gap proofs, NODATA type absence, wildcard denial - NSEC3: SHA-1 iterated hashing, closest encloser proof, hash range - Authority RRSIG verification for denial proofs - Config: [dnssec] enabled/strict (default false, opt-in) - AD bit on Secure, SERVFAIL on Bogus+strict - DnssecStatus cached per entry, ValidationStats logging Performance: - TLD chain pre-warmed on startup (root DNSKEY + TLD DS/DNSKEY) - Referral DS piggybacking from authority sections - DNSKEY prefetch before validation loop - Cold-cache validation: ~1 DNSKEY fetch (down from 5) - Benchmarks: RSA 10.9µs, ECDSA 174ns, DS verify 257ns Also: - write_qname fix for root domain "." (was producing malformed queries) - write_record_header() dedup, write_bytes() bulk writes - DnsRecord::domain() + query_type() accessors - UpstreamMode enum, DEFAULT_EDNS_PAYLOAD const - Real glue TTL (was hardcoded 3600) - DNSSEC restricted to recursive mode only Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * feat: TCP fallback, query minimization, UDP auto-disable Transport resilience for restrictive networks (ISPs blocking UDP:53): - DNS-over-TCP fallback: UDP fail/truncation → automatic TCP retry - UDP auto-disable: after 3 consecutive failures, switch to TCP-first - IPv6 → TCP directly (UDP socket binds 0.0.0.0, can't reach IPv6) - Network change resets UDP detection for re-probing - Root hint rotation in TLD priming Privacy: - RFC 7816 query minimization: root servers see TLD only, not full name Code quality: - Merged find_starting_ns + find_starting_zone → find_closest_ns - Extracted resolve_ns_addrs_from_glue shared helper - Removed overall timeout wrapper (per-hop timeouts sufficient) - forward_tcp for DNS-over-TCP (RFC 1035 §4.2.2) Testing: - Mock TCP-only DNS server for fallback tests (no network needed) - tcp_fallback_resolves_when_udp_blocked - tcp_only_iterative_resolution - tcp_fallback_handles_nxdomain - udp_auto_disable_resets - Integration test suite (4 suites, 51 tests) - Network probe script (tests/network-probe.sh) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: DNSSEC verified badge in dashboard query log - Add dnssec field to QueryLogEntry, track validation status per query - DnssecStatus::as_str() for API serialization - Dashboard shows green checkmark next to DNSSEC-verified responses - Blog post: add "How keys get there" section, transport resilience section, trim code blocks, update What's Next Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: use SVG shield for DNSSEC badge, update blog HTML Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: NS cache lookup from authorities, UDP re-probe, shield alignment - find_closest_ns checks authorities (not just answers) for NS records, fixing TLD priming cache misses that caused redundant root queries - Periodic UDP re-probe every 5min when disabled — re-enables UDP after switching from a restrictive network to an open one - Dashboard DNSSEC shield uses fixed-width container for alignment - Blog post: tuck key-tag into trust anchor paragraph Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: TCP single-write, mock server consistency, integration tests - TCP single-write fix: combine length prefix + message to avoid split segments that Microsoft/Azure DNS servers reject - Mock server (spawn_tcp_dns_server) updated to use single-write too - Tests: forward_tcp_wire_format, forward_tcp_single_segment_write - Integration: real-server checks for Microsoft/Office/Azure domains Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: recursive bar in dashboard, special-use domain interception Dashboard: - Add Recursive bar to resolution paths chart (cyan, distinct from Override) - Add RECURSIVE path tag style in query log Special-use domains (RFC 6761/6303/8880/9462): - .localhost → 127.0.0.1 (RFC 6761) - Private reverse PTR (10.x, 192.168.x, 172.16-31.x) → NXDOMAIN - _dns.resolver.arpa (DDR) → NXDOMAIN - ipv4only.arpa (NAT64) → 192.0.0.170/171 - mDNS service discovery for private ranges → NXDOMAIN Eliminates ~900ms SERVFAILs for macOS system queries that were hitting root servers unnecessarily. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * chore: move generated blog HTML to site/blog/posts/, gitignore - Generated HTML now in site/blog/posts/ (gitignored) - CI workflow runs pandoc + make blog before deploy - Updated all internal blog links to /blog/posts/ path - blog/*.md remains the source of truth Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: review feedback — memory ordering, RRSIG time, NS resolution - Ordering::Relaxed → Acquire/Release for UDP_DISABLED/UDP_FAILURES (ARM correctness for cross-thread coordination) - RRSIG time validation: serial number arithmetic (RFC 4034 §3.1.5) + 300s clock skew fudge factor (matches BIND) - resolve_ns_addrs_from_glue collects addresses from ALL NS names, not just the first with glue (improves failover) - is_special_use_domain: eliminate 16 format! allocations per .in-addr.arpa query (parse octet instead) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: API endpoint tests, coverage target - 8 new axum handler tests: health, stats, query-log, overrides CRUD, cache, blocking stats, services CRUD, dashboard HTML - Tests use tower::oneshot — no network, no server startup - test_ctx() builds minimal ServerCtx for isolated testing - `make coverage` target (cargo-tarpaulin), separate from `make all` - 82 total tests (was 74) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit was merged in pull request #17.
This commit is contained in:
Razvan Dimescu
@@ -27,6 +27,8 @@ pub struct Config {
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pub services: Vec<ServiceConfig>,
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#[serde(default)]
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pub lan: LanConfig,
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#[serde(default)]
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pub dnssec: DnssecConfig,
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}
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#[derive(Deserialize)]
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@@ -61,26 +63,112 @@ fn default_api_port() -> u16 {
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5380
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}
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#[derive(Deserialize, Default, PartialEq, Eq, Clone, Copy)]
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#[serde(rename_all = "lowercase")]
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pub enum UpstreamMode {
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#[default]
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Forward,
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Recursive,
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}
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#[derive(Deserialize)]
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pub struct UpstreamConfig {
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#[serde(default)]
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pub mode: UpstreamMode,
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#[serde(default = "default_upstream_addr")]
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pub address: String,
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#[serde(default = "default_upstream_port")]
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pub port: u16,
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#[serde(default = "default_timeout_ms")]
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pub timeout_ms: u64,
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#[serde(default = "default_root_hints")]
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pub root_hints: Vec<String>,
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#[serde(default = "default_prime_tlds")]
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pub prime_tlds: Vec<String>,
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}
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impl Default for UpstreamConfig {
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fn default() -> Self {
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UpstreamConfig {
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mode: UpstreamMode::default(),
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address: default_upstream_addr(),
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port: default_upstream_port(),
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timeout_ms: default_timeout_ms(),
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root_hints: default_root_hints(),
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prime_tlds: default_prime_tlds(),
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}
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}
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}
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fn default_prime_tlds() -> Vec<String> {
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vec![
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// gTLDs
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"com".into(),
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"net".into(),
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"org".into(),
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"info".into(),
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"io".into(),
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"dev".into(),
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"app".into(),
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"xyz".into(),
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"me".into(),
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// EU + European ccTLDs
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"eu".into(),
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"uk".into(),
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"de".into(),
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"fr".into(),
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"nl".into(),
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"it".into(),
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"es".into(),
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"pl".into(),
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"se".into(),
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"no".into(),
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"dk".into(),
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"fi".into(),
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"at".into(),
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"be".into(),
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"ie".into(),
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"pt".into(),
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"cz".into(),
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"ro".into(),
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"gr".into(),
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"hu".into(),
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"bg".into(),
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"hr".into(),
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"sk".into(),
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"si".into(),
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"lt".into(),
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"lv".into(),
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"ee".into(),
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"ch".into(),
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"is".into(),
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// Other major ccTLDs
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"co".into(),
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"br".into(),
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"au".into(),
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"ca".into(),
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"jp".into(),
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]
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}
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fn default_root_hints() -> Vec<String> {
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vec![
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"198.41.0.4".into(), // a.root-servers.net
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"199.9.14.201".into(), // b.root-servers.net
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"192.33.4.12".into(), // c.root-servers.net
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"199.7.91.13".into(), // d.root-servers.net
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"192.203.230.10".into(), // e.root-servers.net
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"192.5.5.241".into(), // f.root-servers.net
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"192.112.36.4".into(), // g.root-servers.net
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"198.97.190.53".into(), // h.root-servers.net
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"192.36.148.17".into(), // i.root-servers.net
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"192.58.128.30".into(), // j.root-servers.net
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"193.0.14.129".into(), // k.root-servers.net
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"199.7.83.42".into(), // l.root-servers.net
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"202.12.27.33".into(), // m.root-servers.net
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]
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}
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fn default_upstream_addr() -> String {
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String::new() // empty = auto-detect from system resolver
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}
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@@ -88,7 +176,7 @@ fn default_upstream_port() -> u16 {
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53
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}
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fn default_timeout_ms() -> u64 {
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3000
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5000
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}
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#[derive(Deserialize)]
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@@ -250,6 +338,14 @@ fn default_lan_peer_timeout() -> u64 {
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90
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}
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#[derive(Deserialize, Clone, Default)]
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pub struct DnssecConfig {
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#[serde(default)]
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pub enabled: bool,
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#[serde(default)]
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pub strict: bool,
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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