[Documentation] Clarify DNS allowlisting implementation status

[Mossaka]

Priority

Low

Description

The documentation (CLAUDE.md:226-253) extensively describes DNS server allowlisting as a defense against DNS exfiltration, but the actual implementation doesn't restrict DNS queries by destination IP.

Documentation claims

--dns-servers flag restricts DNS queries to trusted DNS server IPs only

Actual behavior

• CLI accepts --dns-servers flag
• Container-level: setup-iptables.sh allows DNS to any IP (port 53)
• Host-level: host-iptables.ts allows DNS to any IP (port 53)
• DNS server IPs are not used in filtering rules

Actions needed

1. Update documentation to reflect actual behavior (interim)
2. Implement DNS IP restriction (see [Security] DNS queries allowed to any IP on port 53 (data exfiltration risk) #9) and then restore docs
3. Add tests verifying DNS queries to non-allowlisted IPs are blocked

Code locations

• CLAUDE.md:226-253 - DNS defense documentation
• src/cli.ts - Parses --dns-servers but doesn't use it for filtering
• containers/copilot/setup-iptables.sh:29-37 - Generic DNS allow rules
• src/host-iptables.ts:181-192 - Generic DNS allow rules

Related to

Issue #9 (DNS IP restriction implementation)

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