feat(headscale): add file-based ACL policy

Ship policy.hujson (mounted + installed on first deploy, edits preserved) and
wire policy.mode=file / policy.path in config.yaml. Translate the Tailscale
"grants" default into headscale's legacy "acls" format (self-access, tag:shared,
Tailscale SSH), since headscale 0.28 doesn't support grants. Embed in deploy.sh
and document `headscale policy check`.

deployments/headscale/README.md

@@ -46,3 +46,19 @@ Unattended provisioning: [`cloud-init.yml`](cloud-init.yml).
 
 DNS for `HEADSCALE_DOMAIN` must resolve to the host and 80/443 be reachable
 before deploy.
+
+## ACL policy
+
+A starter ACL ships in [`policy.hujson`](policy.hujson) (installed to
+`$STACK_DIR/policy.hujson` on first deploy; your edits survive re-deploys).
+**headscale uses Tailscale's legacy `acls` format, not the newer `grants`
+syntax** from the Tailscale admin console — the bundled policy is that default
+translated over (per-user self-access, a `tag:shared` everyone can reach, and
+SSH to your own devices). Some pieces (`autogroup:self`, the `ssh` block) are
+newer/experimental in headscale; a permissive fallback is included in the file.
+
+```bash
+$EDITOR /srv/headscale/policy.hujson
+headscale policy check                          # validate (host CLI wrapper)
+cd /srv/headscale && docker compose restart headscale   # apply
+```

deployments/headscale/build.sh

@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
 #
-# build.sh -- (re)embed docker-compose.yml, Caddyfile, config.yaml, and
-# .env.example into deploy.sh as a base64-encoded tar.gz payload after the
-# __ARCHIVE_BELOW__ marker. Idempotent: strips any existing payload first.
+# build.sh -- (re)embed docker-compose.yml, Caddyfile, config.yaml,
+# policy.hujson and .env.example into deploy.sh as a base64-encoded tar.gz
+# payload after the __ARCHIVE_BELOW__ marker. Idempotent: strips first.
 #
 # Run after editing any of the loose files. The resulting deploy.sh is
 # self-contained and can be scp'd to the target box on its own.
@@ -14,12 +14,12 @@ SCRIPT="$DIR/deploy.sh"
 MARKER="__ARCHIVE_BELOW__"
 
 [[ -f "$SCRIPT" ]] || { echo "deploy.sh not found at $SCRIPT" >&2; exit 1; }
-for f in docker-compose.yml Caddyfile config.yaml .env.example; do
+for f in docker-compose.yml Caddyfile config.yaml policy.hujson .env.example; do
     [[ -f "$DIR/$f" ]] || { echo "Missing $DIR/$f" >&2; exit 1; }
 done
 
 PAYLOAD=$(tar -czf - -C "$DIR" \
-    docker-compose.yml Caddyfile config.yaml .env.example | base64)
+    docker-compose.yml Caddyfile config.yaml policy.hujson .env.example | base64)
 
 TMP=$(mktemp)
 trap 'rm -f "$TMP"' EXIT

deployments/headscale/config.yaml

@@ -44,6 +44,12 @@ log:
   level: info
   format: text
 
+# ACL policy, loaded from a HuJSON file (see policy.hujson, mounted into the
+# container). headscale uses Tailscale's legacy "acls" format, not "grants".
+policy:
+  mode: file
+  path: /etc/headscale/policy.hujson
+
 # Magic DNS for the tailnet. base_domain becomes the suffix for node
 # DNS names (e.g. laptop.__TAILNET_DOMAIN__).
 dns:

deployments/headscale/deploy.sh

@@ -22,9 +22,9 @@
 # regenerates config.yaml from the current .env so edits to .env propagate
 # (but secrets in .env are never touched once seeded).
 #
-# Self-contained: docker-compose.yml, Caddyfile, config.yaml, .env.example
-# are embedded as a base64-encoded tar.gz at the bottom of this file.
-# Rebuild with build.sh after editing the loose source files.
+# Self-contained: docker-compose.yml, Caddyfile, config.yaml, policy.hujson
+# and .env.example are embedded as a base64-encoded tar.gz at the bottom of
+# this file. Rebuild with build.sh after editing the loose source files.
 #
 # Usage:
 #   bash deploy.sh                                 # interactive prompts
@@ -130,7 +130,7 @@ else
     die "No embedded archive found. Run build.sh to embed deployment files."
 fi
 
-for f in docker-compose.yml Caddyfile config.yaml .env.example; do
+for f in docker-compose.yml Caddyfile config.yaml policy.hujson .env.example; do
     [[ -f "$SCRIPT_DIR/$f" ]] || die "Embedded archive missing $f"
 done
 
@@ -213,6 +213,16 @@ set -a; . "$ENV_FILE"; set +a
 log "Generating config.yaml from template..."
 install -m 0600 "$SCRIPT_DIR/config.yaml" "$STACK_DIR/config.yaml"
 
+# ACL policy: install the default on first run only, so your edits survive
+# re-deploys. headscale reads it on start (policy mode = file); after editing,
+# validate with `headscale policy check` and `docker compose restart headscale`.
+if [[ ! -f "$STACK_DIR/policy.hujson" ]]; then
+    log "Installing default ACL policy -> $STACK_DIR/policy.hujson"
+    install -m 0640 "$SCRIPT_DIR/policy.hujson" "$STACK_DIR/policy.hujson"
+else
+    log "ACL policy exists; leaving $STACK_DIR/policy.hujson alone."
+fi
+
 # Escape replacement values for sed (handle slashes/&). Headscale URLs and
 # OIDC secrets can contain those.
 sed_escape() { printf '%s' "$1" | sed -e 's/[\/&]/\\&/g'; }
@@ -301,6 +311,10 @@ Stack dir:   ${STACK_DIR}
 OIDC redirect/callback URI -- register THIS in your pocket-id client:
   https://${HEADSCALE_DOMAIN}/oidc/callback
 
+ACL policy:  ${STACK_DIR}/policy.hujson
+  headscale policy check                  # validate after editing
+  cd ${STACK_DIR} && docker compose restart headscale   # apply changes
+
 Headscale CLI -- use the installed wrapper from anywhere:
   headscale users create alice
   headscale users list
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 exit 0
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deployments/headscale/docker-compose.yml

@@ -55,6 +55,7 @@ services:
       - /var/run/headscale
     volumes:
       - ./config.yaml:/etc/headscale/config.yaml:ro
+      - ./policy.hujson:/etc/headscale/policy.hujson:ro
       - headscale-data:/var/lib/headscale
     healthcheck:
       test: ["CMD", "headscale", "health"]

deployments/headscale/policy.hujson

@@ -0,0 +1,49 @@
+// headscale ACL policy (HuJSON: JSON with // comments and trailing commas).
+//
+// IMPORTANT: headscale uses Tailscale's *legacy* policy format -- the top-level
+// "acls" array -- NOT the newer "grants" syntax from the Tailscale admin
+// console. This file is the grants-style default translated into "acls".
+//
+// Edit, then:
+//   headscale policy check                 # validate (uses the wrapper)
+//   docker compose restart headscale       # apply (policy mode = file)
+//
+// A few features here (autogroup:self, the ssh block) are newer/experimental
+// in headscale and may depend on your version. If headscale rejects this
+// policy at start, switch to the permissive fallback at the bottom.
+{
+  // Static user groups, e.g. "group:admins": ["alice@example.com"].
+  "groups": {},
+
+  // Who may apply which tags to devices.
+  "tagOwners": {
+    // tag:shared -- a device any member is allowed to reach.
+    "tag:shared": ["autogroup:member"],
+  },
+
+  // Network access rules (first match wins; default-deny otherwise).
+  "acls": [
+    // Each user can reach their own devices, on all ports.
+    { "action": "accept", "src": ["autogroup:member"], "dst": ["autogroup:self:*"] },
+
+    // Anyone can reach devices tagged tag:shared, on all ports.
+    { "action": "accept", "src": ["*"], "dst": ["tag:shared:*"] },
+  ],
+
+  // Tailscale SSH rules (nodes must run `tailscale up --ssh`).
+  "ssh": [
+    // SSH into your own devices. "check" = periodic browser re-auth (the
+    // Tailscale default). Use "accept" if your headscale lacks check mode.
+    {
+      "action": "check",
+      "src":    ["autogroup:member"],
+      "dst":    ["autogroup:self"],
+      "users":  ["autogroup:nonroot", "root"],
+    },
+  ],
+
+  // ---- Permissive fallback ----------------------------------------------
+  // Replace the "acls" above with this (and drop "ssh") if the rules are
+  // rejected, to allow everything while you iterate:
+  //   "acls": [ { "action": "accept", "src": ["*"], "dst": ["*:*"] } ],
+}