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Russell Bryant
c5d1d76d94
Migrate all sandbox and VM driver network policy enforcement from iptables to nftables. nftables provides atomic ruleset loading, a cleaner rule syntax, and is the standard netfilter interface in modern kernels. Sandbox bypass enforcement (openshell-sandbox): - Replace iptables chain of individual rule insertions with a single atomic nftables ruleset load via nft -f - New nft_ruleset module with pure functions for ruleset generation and unit tests - Combine log and reject rules in one inet family table (handles both IPv4 and IPv6 in a single ruleset) - Fall back to reject-only ruleset when kernel lacks nft_log support - Enable net.netfilter.nf_log_all_netns so log rules work from non-init network namespaces - Use temp file for nft ruleset loading instead of stdin for compatibility with minimal VM guest environments VM TAP networking (openshell-driver-vm): - Replace iptables NAT/forwarding rules with nftables equivalents - New nft_ruleset module for TAP network rule generation with unit tests - Atomic table-per-TAP-device lifecycle (create/destroy) - Host-side rules provide NAT infrastructure and defense-in-depth isolation (input chain restricts VM to gateway port only, forward chain blocks unsolicited inbound); primary security enforcement happens inside the VM guest via the sandbox supervisor's own rules VM init script: - Load nft kernel modules at sandbox init - Enable nf_log_all_netns sysctl for bypass detection logging OCSF / docs: - Update firewall rule engine references from iptables to nftables - Document host firewall interaction model and two-layer enforcement architecture in VM driver README and compute drivers reference Closes #1335 Signed-off-by: Russell Bryant <rbryant@redhat.com>