jochen
5d01258b67
nftables drops its container, NET_ADMIN, the container-runtime capability, the runtime base images and the Dockerfile; its tools are declared as a TypeScript bundle the toolchain compiles and node-tools loads on every node. The runtime runs as the operator's account, so the tool runs the filter's commands through sudo without a prompt when it is not root (ADR 0175 §4); the filter file is the path the manifest's filtering names, no container env carrying it.
87 lines
2.1 KiB
JSON
87 lines
2.1 KiB
JSON
{
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"module": "nftables",
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"version": "1",
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"capabilities": [
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"firewall"
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],
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"claims": [
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{
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"name": "node-packet-filter",
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"scope": "node",
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"serves": [
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"rules",
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"reload",
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"remove"
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]
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}
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],
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"filtering": {
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"into": "/etc/nftables.conf"
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},
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"resources": [
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{
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"id": "mesh-state",
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"type": "directory",
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"mode": "0700",
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"place": "mesh"
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},
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{
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"id": "package",
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"type": "package",
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"package": "nftables"
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},
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{
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"id": "unit",
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"type": "file",
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"path": "/etc/systemd/system/mesh-filter.service",
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"content": "[Unit]\nDescription=The mesh's packet filter, derived from what is assigned to this node\nWants=network-pre.target\nBefore=network-pre.target\n\n[Service]\nType=oneshot\nRemainAfterExit=yes\nExecStart=nft -f /etc/nftables.conf\nExecReload=nft -f /etc/nftables.conf\nExecStop=nft delete table inet mesh\n\n[Install]\nWantedBy=multi-user.target\n",
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"mode": "0644"
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},
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{
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"id": "stock-unit-stop",
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"type": "file",
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"path": "/etc/systemd/system/nftables.service.d/mesh.conf",
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"content": "# The mesh: stopping the stock unit deletes only the mesh's table, never the whole ruleset\n# (novox/hq ADR 0100) — a flush would take the container runtime's rules and any firewall with it.\n[Service]\nExecStop=\nExecStop=nft delete table inet mesh\n",
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"mode": "0644"
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},
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{
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"id": "load",
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"type": "service",
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"unit": "mesh-filter.service",
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"state": "running",
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"boot": "enabled",
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"restart-on": [
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"unit",
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"stock-unit-stop"
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],
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"reload-on": [
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"filtering"
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]
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},
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{
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"id": "front-end",
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"type": "package",
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"package": "ufw",
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"absent": true
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}
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],
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"tools": [
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"firewall_rules"
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],
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"own-secrets": {
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"broker": "${dir:mesh-state}/broker"
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},
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"build": {
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"artifacts": [
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{
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"name": "tools",
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"kind": "bundle",
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"language": "typescript",
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"entrypoints": [
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"tools/index.js"
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]
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}
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]
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}
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}
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