diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml new file mode 100644 index 0000000..65cf4b4 --- /dev/null +++ b/.github/workflows/ci.yml @@ -0,0 +1,66 @@ +name: ci + +on: + push: + branches: [main, develop] + pull_request: + +permissions: + contents: read + +jobs: + test: + name: test + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + - uses: actions/setup-go@v5 + with: + go-version: '1.25' + check-latest: true + cache: true + - run: go vet ./... + - run: go test -race -short ./... + + lint: + name: lint + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + - uses: actions/setup-go@v5 + with: + go-version: '1.25' + cache: true + - uses: golangci/golangci-lint-action@v9 + with: + # golangci-lint v1.x was built with Go 1.24 and refuses to analyze + # source targeting go 1.25 (which our go.mod pins). Pin a recent + # v2.x; the action's @v6/@v7/@v8 don't speak v2 config format. + version: v2.12.2 + args: --timeout=5m + + build-matrix: + name: build ${{ matrix.goos }}/${{ matrix.goarch }} + runs-on: ubuntu-latest + strategy: + matrix: + goos: [linux, darwin] + goarch: [amd64, arm64] + steps: + - uses: actions/checkout@v4 + - uses: actions/setup-go@v5 + with: + go-version: '1.25' + cache: true + - name: build exitnode + env: + GOOS: ${{ matrix.goos }} + GOARCH: ${{ matrix.goarch }} + CGO_ENABLED: '0' + run: go build -trimpath -o /dev/null ./cmd/exitnode + - name: build exitnode-mcp + env: + GOOS: ${{ matrix.goos }} + GOARCH: ${{ matrix.goarch }} + CGO_ENABLED: '0' + run: go build -trimpath -o /dev/null ./cmd/exitnode-mcp diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml new file mode 100644 index 0000000..8dc7772 --- /dev/null +++ b/.github/workflows/release.yml @@ -0,0 +1,26 @@ +name: release + +on: + push: + tags: ['v*'] + +permissions: + contents: write + +jobs: + goreleaser: + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v4 + with: + fetch-depth: 0 + - uses: actions/setup-go@v5 + with: + go-version: '1.25' + cache: true + - uses: goreleaser/goreleaser-action@v6 + with: + version: latest + args: release --clean + env: + GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} diff --git a/.gitignore b/.gitignore index aaadf73..2c511e8 100644 --- a/.gitignore +++ b/.gitignore @@ -30,3 +30,9 @@ go.work.sum # Editor/IDE # .idea/ # .vscode/ + +# Superpowers working artifacts (specs, plans, review notes) — never committed +docs/superpowers/ + +# Local Claude project guidance — never committed +CLAUDE.md diff --git a/.golangci.yml b/.golangci.yml new file mode 100644 index 0000000..ba96cc6 --- /dev/null +++ b/.golangci.yml @@ -0,0 +1,29 @@ +version: "2" + +# Standard preset = errcheck, govet, ineffassign, staticcheck, unused. +# Matches what golangci-lint v1 enabled implicitly. Add more linters +# here only after the standard set is consistently green. +linters: + default: standard + settings: + errcheck: + # Stdout-write errors are not meaningfully recoverable in this CLI; + # do not require every fmt.Fprint* / Fprintln / Fprintf call to be + # blank-assigned. + exclude-functions: + - fmt.Fprint + - fmt.Fprintf + - fmt.Fprintln + exclusions: + rules: + # Test files routinely defer Close() on stores/servers without checking + # the error — the goroutine is already torn down and the next test will + # surface any real problem. + - path: _test\.go + linters: + - errcheck + +formatters: + enable: + - gofmt + - goimports diff --git a/.goreleaser.yaml b/.goreleaser.yaml new file mode 100644 index 0000000..0393371 --- /dev/null +++ b/.goreleaser.yaml @@ -0,0 +1,64 @@ +version: 2 + +project_name: exitnode + +before: + hooks: + - go mod download + +builds: + - id: exitnode + main: ./cmd/exitnode + binary: exitnode + env: + - CGO_ENABLED=0 + goos: [linux, darwin] + goarch: [amd64, arm64] + flags: [-trimpath] + ldflags: + - -s -w + - -X main.version={{.Version}} + - -X main.commit={{.Commit}} + - -X main.date={{.Date}} + - id: exitnode-mcp + main: ./cmd/exitnode-mcp + binary: exitnode-mcp + env: + - CGO_ENABLED=0 + goos: [linux, darwin] + goarch: [amd64, arm64] + flags: [-trimpath] + ldflags: + - -s -w + - -X main.version={{.Version}} + +archives: + - id: default + formats: [tar.gz] + name_template: >- + {{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }} + files: + - LICENSE + - README.md + - examples/config.toml + - examples/mcp.json + - scripts/install.sh + +checksum: + name_template: 'checksums.txt' + algorithm: sha256 + +changelog: + sort: asc + filters: + exclude: + - '^docs:' + - '^test:' + - '^chore:' + +release: + github: + owner: ceballosiker + name: exit-node + draft: false + prerelease: auto diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..d782ffa --- /dev/null +++ b/Makefile @@ -0,0 +1,26 @@ +.PHONY: build test test-integration lint vet install clean + +GO ?= go + +build: + $(GO) build -o bin/exitnode ./cmd/exitnode + $(GO) build -o bin/exitnode-mcp ./cmd/exitnode-mcp + +test: + $(GO) test -race -short ./... + +test-integration: + EXITNODE_INTEGRATION=1 $(GO) test -race -tags integration ./... + +vet: + $(GO) vet ./... + +lint: + golangci-lint run + +install: + $(GO) install ./cmd/exitnode + $(GO) install ./cmd/exitnode-mcp + +clean: + rm -rf bin/ diff --git a/README.md b/README.md index 8a443fe..6d4f76c 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,248 @@ # exit-node -Tailscale exit nodes on demand. Provision, rotate across cloud regions, and sync pfSense gateways. CLI + MCP for AI agents. + +[![Go Version](https://img.shields.io/badge/go-1.25-00ADD8?logo=go)](go.mod) +[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE) +[![CI](https://github.com/ceballosiker/exit-node/actions/workflows/ci.yml/badge.svg)](https://github.com/ceballosiker/exit-node/actions/workflows/ci.yml) + +On-demand Tailscale exit nodes that rotate across cloud regions and keep your +pfSense gateway in sync. Driven from a CLI for humans and an MCP server for +AI agents. + +> **Personal project.** Built for my own home network. MIT-licensed and +> forkable, but no guarantees on uptime, breaking changes, or issue response +> — depend on this at your own risk. + +## Why + +VPN exit nodes are useful exactly because they're not always-on: + +- **Geo-bound testing.** Hop into `us-east1`, `europe-west1`, `asia-northeast1` + on demand and tear it down when done. +- **Egress-IP rotation.** A new node every cycle, so your egress address moves + without manual cloud-console clicking. +- **Tunnel discipline.** When you're done, the route disappears and your home + gateway returns to whatever it was before — no leftover state. + +Running a fleet of always-on exit nodes is wasteful and noisy. `exit-node` +provisions one when you ask, hands it to Tailscale, swaps your pfSense default +route to it, verifies egress, and destroys the old one cleanly. + +## How it works + +The rotate flow is a small state machine that runs end-to-end on `exitnode up`: + +``` +1. mint → ephemeral Tailscale auth-key (single-use, ~5min TTL) +2. provision → GCP VM with metadata-baked auth-key + tags + hostname +3. wait → poll Tailscale until the device shows up connected +4. authorize → set tags + approve subnet routes for the new device +5. probe → verify egress works through the candidate node +6. cut over → pfSense gateway monitor IP swapped to the new node +7. verify → re-probe through the live route; restore prior node on failure +8. cleanup → destroy the previous VM, delete its Tailscale device +``` + +Every step is idempotent and observable. If verification fails post-cutover, +the prior gateway is restored before the candidate is destroyed. + +## Architecture + +Four narrow client interfaces, one orchestrator: + +| Package | Responsibility | +| --- | --- | +| `internal/core` | Rotate state machine + lifecycle ops (`Up` / `Down` / `Rotate` / `Start` / `Stop` / `Destroy` / `List` / `Status` / `Health` / `SyncPFSense` / `EstimateCost`) — single source of truth for business logic, called by both the CLI and the MCP server | +| `internal/config` | Typed configuration loader (project, region, tags, pfSense, gateway names) | +| `internal/state` | On-disk state file — what's currently running, last rotation, prior nodes | +| `internal/gcp` | Compute Engine adapter — `Provision` / `Start` / `Stop` / `Destroy` / `List` / `Get` | +| `internal/tailscale` | v2 API adapter — mint keys, wait for device, authorize, set tags, delete | +| `internal/pfsense` | pfSense REST adapter — read & swap gateway-monitor IP, apply | +| `internal/verify` | Egress probes — `EgressVia` (through a candidate) and `EgressDirect` (post-cutover) | + +Each adapter is interface-first; tests run against fakes. The `gcp` package +also has a `//go:build integration` smoke test that exercises real GCP +(skipped unless `EXITNODE_INTEGRATION=1` and `EXITNODE_TEST_PROJECT` are set). + +## Repository layout + +``` +exit-node/ +├── cmd/ +│ ├── exitnode/ # cobra CLI binary +│ └── exitnode-mcp/ # MCP stdio server binary +├── internal/ +│ ├── config/ # TOML loader + env-var resolution +│ ├── core/ # rotate orchestrator + lifecycle ops +│ ├── gcp/ # GCP Compute Engine adapter +│ ├── pfsense/ # pfSense REST adapter +│ ├── state/ # on-disk state cache (flock-protected) +│ ├── tailscale/ # Tailscale v2 API adapter +│ └── verify/ # egress probes +├── examples/ +│ ├── config.toml # annotated reference config +│ └── mcp.json # Claude Desktop / OpenClaw MCP snippet +├── scripts/ +│ └── install.sh # VM first-boot bootstrap (fetched via startup-script-url) +├── .github/workflows/ +│ ├── ci.yml # vet + lint + race tests + cross-build matrix +│ └── release.yml # goreleaser on tag push +├── .goreleaser.yaml +├── Makefile +├── go.mod +└── README.md +``` + +## Prerequisites + +- **GCP project** with the Compute Engine API enabled and a + service account with `compute.instances.{create,start,stop,delete}`, + `compute.zones.list`, and `compute.images.useReadOnly` on + `projects/debian-cloud`. Either authenticate via Application + Default Credentials (`gcloud auth application-default login`) or + export the SA JSON in `GCP_CREDENTIALS_JSON`. +- **Tailscale tailnet** with an OAuth client (scopes: + `auth_keys` write, `devices:core` write) and ACL `tagOwners` + entries for whatever tag(s) you list in `tailscale.tags`. The + tailnet must also have `autoApprovers.exitNode` set to your + exit-node tag if you want approval to happen without manual + admin intervention. +- **pfSense** with the + [community pfsense-api plugin](https://github.com/jaredhendrickson13/pfsense-api) + installed and an API key minted. The plugin must have the + `Routing` permission group enabled for the key. +- **`tailscale` CLI** installed on the host that runs `exitnode` + (used by the pre-cutover egress probe). If unavailable, the + probe is skipped with a warning — see Troubleshooting. + +## Install + +Install both binaries via `go install`: + +```bash +go install github.com/iker/exit-node/cmd/exitnode@latest +go install github.com/iker/exit-node/cmd/exitnode-mcp@latest +``` + +Or download a release archive from +[Releases](https://github.com/ceballosiker/exit-node/releases) and drop +`exitnode` + `exitnode-mcp` into your `$PATH`. + +## Configure + +Copy [`examples/config.toml`](examples/config.toml) to +`~/.config/exitnode/config.toml` and edit the values for your +environment. Every field is annotated in the example. + +Export the secret env-vars referenced by your config: + +```bash +export TAILSCALE_OAUTH_CLIENT_ID=... +export TAILSCALE_OAUTH_CLIENT_SECRET=... +export PFSENSE_API_KEY=... +# Optional — use a service-account JSON instead of ADC: +export GCP_CREDENTIALS_JSON="$(cat path/to/sa.json)" +``` + +Run `exitnode --help` to see the full command list. The most common flow: + +```bash +exitnode up # provision (idempotent) +exitnode status # see what's active +exitnode health # probe egress +exitnode rotate --region us-east1 # cut over to a new region +exitnode down --destroy # tear it all down +``` + +## Development + +Requirements: Go 1.25+. + +```bash +# Unit tests (race-enabled, fast) +make test + +# Full suite incl. the build-tagged GCP integration test +# (still skips unless EXITNODE_INTEGRATION=1 and EXITNODE_TEST_PROJECT are set) +make test-integration + +# Vet +make vet + +# Lint (requires golangci-lint) +make lint +``` + +The integration test against real GCP additionally honours: + +| Env var | Default | Purpose | +| --- | --- | --- | +| `EXITNODE_INTEGRATION` | _unset_ | Must be `1` to run real-GCP tests | +| `EXITNODE_TEST_PROJECT` | _unset_ | GCP project ID to run against | +| `EXITNODE_TEST_REGION` | `us-central1` | Region for the smoke test | +| `GCP_CREDENTIALS_JSON` | _unset_ | Service-account JSON; otherwise ADC is used | + +## Using exitnode-mcp + +`exitnode-mcp` is a stdio MCP server that exposes the same operations to +AI agents (Claude Desktop, OpenClaw, any MCP host). Copy +[`examples/mcp.json`](examples/mcp.json) into your client's MCP +configuration. The binary must be on `$PATH`. + +Available tools: `provision_exit_node`, `start_exit_node`, +`stop_exit_node`, `destroy_exit_node`, `rotate_exit_node`, +`list_exit_nodes`, `get_status`, `verify_connectivity`, +`sync_pfsense_gateway`, `estimate_cost`. `destroy_exit_node` requires +an explicit `name` argument — there is no "destroy active" shortcut +at the MCP layer, deliberately. + +## Troubleshooting + +**`tailscale OAuth env vars ... are unset`** +The env-var names declared in `[tailscale].oauth_client_id_env` and +`oauth_client_secret_env` are not set in the calling shell. Mint a new +OAuth client at `https://login.tailscale.com/admin/settings/oauth` and +export the two values. Check by running +`echo "$TAILSCALE_OAUTH_CLIENT_ID"` (or whatever name your config uses). + +**pfSense revert failed — both nodes alive** +This is the loud-error case from the rotate state machine: after a +`pfSense Apply` failure, the orchestrator tried to revert to the old +gateway IP and that revert also failed. Both VMs remain running so your +home network keeps its VPN. Recover by manually setting the pfSense +gateway monitor IP to a known-good Tailscale IP from +`exitnode list`, then `exitnode down --destroy` to clean up. File an +issue with the orchestrator log so we can harden this path. + +**`exitnode up` says "no `tailscale` CLI on host"** +The pre-cutover egress probe shells out to `tailscale`. Install the +client (`curl -fsSL https://tailscale.com/install.sh | sh` on Linux, +`brew install tailscale` on macOS) and re-run. The probe is skipped +silently if the CLI is absent — it does not block provisioning, but +you lose verification. + +**"another exitnode process is running (state.json locked)"** +The state file's POSIX flock is held by another `exitnode` or +`exitnode-mcp` invocation. Most often this means a previous run +hung. Confirm with `lsof ~/.config/exitnode/state.json.lock`; if +nothing holds it, the lock file is stale and safe to delete with +`rm ~/.config/exitnode/state.json.lock`. + +## What's next + +v0.1 covers the GCP + Tailscale + pfSense path the spec calls out as the +core use case. Items deferred for later versions: + +- **HTTP/SSE MCP transport** so the MCP server can be hosted remotely + rather than only over stdio. +- **`--strict-verify`** flag to promote "no `tailscale` CLI on host" from + a silent probe-skip to a hard failure. +- **Additional cloud providers** — AWS and Hetzner implementations of + the `Provider` interface. +- **Netgate Plus pfSense API** as a second `PFSenseClient` implementation + for users on the official Netgate plugin instead of the community one. +- **Scheduled rotation + auto-teardown on idle.** +- **Homebrew tap** for `brew install exitnode`. + +## License + +[MIT](LICENSE) © 2026 Iker. diff --git a/cmd/exitnode-mcp/buildcore.go b/cmd/exitnode-mcp/buildcore.go new file mode 100644 index 0000000..2b06969 --- /dev/null +++ b/cmd/exitnode-mcp/buildcore.go @@ -0,0 +1,103 @@ +package main + +import ( + "context" + "errors" + "fmt" + "log/slog" + "os" + "path/filepath" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/core" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/pfsense" + "github.com/iker/exit-node/internal/state" + "github.com/iker/exit-node/internal/tailscale" + "github.com/iker/exit-node/internal/verify" +) + +func defaultConfigPath() string { + if xdg := os.Getenv("XDG_CONFIG_HOME"); xdg != "" { + return filepath.Join(xdg, "exitnode", "config.toml") + } + home, _ := os.UserHomeDir() + return filepath.Join(home, ".config", "exitnode", "config.toml") +} + +func defaultStatePath() string { + if xdg := os.Getenv("XDG_CONFIG_HOME"); xdg != "" { + return filepath.Join(xdg, "exitnode", "state.json") + } + home, _ := os.UserHomeDir() + return filepath.Join(home, ".config", "exitnode", "state.json") +} + +// buildCore constructs a *core.Core with all live clients wired up. Each +// MCP tool call invokes this — opening + closing the state lock per +// invocation so the CLI and MCP can interleave without deadlocking each +// other. +func buildCore(ctx context.Context) (*core.Core, func(), error) { + cfg, err := config.Load(defaultConfigPath()) + if err != nil { + return nil, func() {}, fmt.Errorf("load config: %w", err) + } + + tsID, tsSecret, err := cfg.ResolveTailscaleSecrets() + if err != nil { + return nil, func() {}, err + } + pfKey, err := cfg.ResolvePFSenseAPIKey() + if err != nil { + return nil, func() {}, err + } + _, gcpJSON, err := cfg.ResolveGCPCredentials() + if err != nil { + return nil, func() {}, err + } + + provider, err := gcp.New(ctx, gcp.Options{ + Project: cfg.GCP.Project, + Region: cfg.GCP.DefaultRegion, + CredentialsJSON: gcpJSON, + Network: cfg.GCP.Network, + InstallScriptURL: cfg.Behavior.InstallScriptURL, + }) + if err != nil { + return nil, func() {}, fmt.Errorf("gcp: %w", err) + } + + ts, err := tailscale.New(tailscale.Options{ + Tailnet: cfg.Tailscale.Tailnet, + ClientID: tsID, + ClientSecret: tsSecret, + }) + if err != nil { + return nil, func() {}, fmt.Errorf("tailscale: %w", err) + } + + pf, err := pfsense.New(pfsense.Options{ + BaseURL: cfg.PFSense.Host, + APIKey: pfKey, + VerifyTLS: cfg.PFSense.VerifyTLS, + }) + if err != nil { + return nil, func() {}, fmt.Errorf("pfsense: %w", err) + } + + probe := verify.New(cfg.Behavior.ProbeURL) + + store, err := state.Open(defaultStatePath()) + if err != nil { + if errors.Is(err, state.ErrLocked) { + return nil, func() {}, fmt.Errorf("state.json locked by another process") + } + return nil, func() {}, fmt.Errorf("state: %w", err) + } + + log := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelInfo})) + c := core.New(core.Deps{ + Config: cfg, Provider: provider, TS: ts, PF: pf, Probe: probe, Store: store, Logger: log, + }) + return c, func() { _ = store.Close() }, nil +} diff --git a/cmd/exitnode-mcp/main.go b/cmd/exitnode-mcp/main.go new file mode 100644 index 0000000..323596d --- /dev/null +++ b/cmd/exitnode-mcp/main.go @@ -0,0 +1,30 @@ +package main + +import ( + "context" + "fmt" + "os" + "os/signal" + "syscall" + + "github.com/modelcontextprotocol/go-sdk/mcp" +) + +var version = "dev" + +func main() { + ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM) + defer cancel() + + server := mcp.NewServer(&mcp.Implementation{ + Name: "exitnode-mcp", + Version: version, + }, nil) + + registerTools(server) + + if err := server.Run(ctx, &mcp.StdioTransport{}); err != nil { + fmt.Fprintln(os.Stderr, "exitnode-mcp:", err) + os.Exit(1) + } +} diff --git a/cmd/exitnode-mcp/tools.go b/cmd/exitnode-mcp/tools.go new file mode 100644 index 0000000..eca4245 --- /dev/null +++ b/cmd/exitnode-mcp/tools.go @@ -0,0 +1,234 @@ +package main + +import ( + "context" + "encoding/json" + "fmt" + "time" + + "github.com/modelcontextprotocol/go-sdk/mcp" + + "github.com/iker/exit-node/internal/core" +) + +// --- Typed argument structs --- + +type provisionArgs struct { + Region string `json:"region,omitempty" jsonschema:"GCP region; omit to use the config default"` + MachineType string `json:"machine_type,omitempty" jsonschema:"GCP machine type; omit to use the config default"` +} + +type nameArgs struct { + Name string `json:"name" jsonschema:"Exit-node name (matches the GCP VM name)"` +} + +type nameOptionalArgs struct { + Name string `json:"name,omitempty" jsonschema:"Exit-node name; omit to use the currently active node"` +} + +type rotateArgs struct { + Region string `json:"region,omitempty" jsonschema:"GCP region for the replacement node; omit to use the config default"` +} + +type costArgs struct { + Period string `json:"period,omitempty" jsonschema:"Look-back window: 24h, 7d, month; omit for since-creation"` +} + +// --- registerTools wires every tool --- + +func registerTools(s *mcp.Server) { + mcp.AddTool(s, &mcp.Tool{ + Name: "provision_exit_node", + Description: "Provision (or return the existing) active exit node. Idempotent.", + }, func(ctx context.Context, _ *mcp.CallToolRequest, a provisionArgs) (*mcp.CallToolResult, any, error) { + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + node, err := c.Up(ctx, core.UpOpts{Region: a.Region, MachineType: a.MachineType}) + return jsonResult(node, err) + }) + + mcp.AddTool(s, &mcp.Tool{ + Name: "start_exit_node", + Description: "Start a stopped exit node by name (defaults to the currently active node).", + }, func(ctx context.Context, _ *mcp.CallToolRequest, a nameOptionalArgs) (*mcp.CallToolResult, any, error) { + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + name, err := resolveName(c, a.Name) + if err != nil { + return nil, nil, err + } + err = c.Start(ctx, name) + return jsonResult(map[string]string{"started": name}, err) + }) + + mcp.AddTool(s, &mcp.Tool{ + Name: "stop_exit_node", + Description: "Stop a running exit node by name (defaults to the currently active node).", + }, func(ctx context.Context, _ *mcp.CallToolRequest, a nameOptionalArgs) (*mcp.CallToolResult, any, error) { + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + name, err := resolveName(c, a.Name) + if err != nil { + return nil, nil, err + } + err = c.Stop(ctx, name) + return jsonResult(map[string]string{"stopped": name}, err) + }) + + mcp.AddTool(s, &mcp.Tool{ + Name: "destroy_exit_node", + Description: "Destroy an exit-node VM + its Tailscale device. Name is REQUIRED — there is no implicit 'destroy active' here.", + }, func(ctx context.Context, _ *mcp.CallToolRequest, a nameArgs) (*mcp.CallToolResult, any, error) { + if a.Name == "" { + return nil, nil, fmt.Errorf("name is required for destroy_exit_node") + } + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + err = c.Destroy(ctx, a.Name) + return jsonResult(map[string]string{"destroyed": a.Name}, err) + }) + + mcp.AddTool(s, &mcp.Tool{ + Name: "rotate_exit_node", + Description: "Provision a new exit node, cut pfSense over, destroy the old one.", + }, func(ctx context.Context, _ *mcp.CallToolRequest, a rotateArgs) (*mcp.CallToolResult, any, error) { + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + res, err := c.Rotate(ctx, core.RotateOpts{Region: a.Region}) + return jsonResult(res, err) + }) + + mcp.AddTool(s, &mcp.Tool{ + Name: "list_exit_nodes", + Description: "List all exitnode-managed VMs in the GCP project.", + }, func(ctx context.Context, _ *mcp.CallToolRequest, _ struct{}) (*mcp.CallToolResult, any, error) { + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + nodes, err := c.List(ctx) + return jsonResult(nodes, err) + }) + + mcp.AddTool(s, &mcp.Tool{ + Name: "get_status", + Description: "Get cached + live status of the active exit node, plus a drift flag.", + }, func(ctx context.Context, _ *mcp.CallToolRequest, _ struct{}) (*mcp.CallToolResult, any, error) { + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + st, err := c.Status(ctx) + return jsonResult(st, err) + }) + + mcp.AddTool(s, &mcp.Tool{ + Name: "verify_connectivity", + Description: "Probe egress through the active exit node and return ok / egress_ip / expected_ip.", + }, func(ctx context.Context, _ *mcp.CallToolRequest, _ struct{}) (*mcp.CallToolResult, any, error) { + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + h, err := c.Health(ctx) + return jsonResult(h, err) + }) + + mcp.AddTool(s, &mcp.Tool{ + Name: "sync_pfsense_gateway", + Description: "Push the active node's Tailscale IP to the pfSense gateway-monitor IP + apply.", + }, func(ctx context.Context, _ *mcp.CallToolRequest, _ struct{}) (*mcp.CallToolResult, any, error) { + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + err = c.SyncPFSense(ctx) + return jsonResult(map[string]string{"status": "ok"}, err) + }) + + mcp.AddTool(s, &mcp.Tool{ + Name: "estimate_cost", + Description: "Estimate spend for the active exit node over a look-back window.", + }, func(ctx context.Context, _ *mcp.CallToolRequest, a costArgs) (*mcp.CallToolResult, any, error) { + c, cleanup, err := buildCore(ctx) + if err != nil { + return nil, nil, err + } + defer cleanup() + var d time.Duration + if a.Period != "" { + p, perr := parsePeriodMCP(a.Period) + if perr != nil { + return nil, nil, perr + } + d = p + } + r, err := c.EstimateCost(ctx, core.CostOpts{Period: d}) + return jsonResult(r, err) + }) +} + +// resolveName falls back to the cached active node when the caller +// passed an empty name (used by start/stop tools). +func resolveName(c *core.Core, name string) (string, error) { + if name != "" { + return name, nil + } + active, err := c.GetActive() + if err != nil { + return "", fmt.Errorf("resolve active node: %w", err) + } + if active == nil { + return "", fmt.Errorf("name omitted and no active exit node recorded") + } + return active.Name, nil +} + +// jsonResult marshals v to JSON text content if err is nil; otherwise +// returns the error to the SDK which renders it as an isError result. +func jsonResult(v any, err error) (*mcp.CallToolResult, any, error) { + if err != nil { + return nil, nil, err + } + b, mErr := json.MarshalIndent(v, "", " ") + if mErr != nil { + return nil, nil, fmt.Errorf("marshal result: %w", mErr) + } + return &mcp.CallToolResult{ + Content: []mcp.Content{&mcp.TextContent{Text: string(b)}}, + }, v, nil +} + +// parsePeriodMCP parses a human look-back window string (24h, 7d, month) +// into a time.Duration. Same semantics as the CLI's parsePeriod helper. +func parsePeriodMCP(s string) (time.Duration, error) { + if s == "month" { + return 30 * 24 * time.Hour, nil + } + if len(s) > 1 && s[len(s)-1] == 'd' { + var days int + if _, err := fmt.Sscanf(s, "%dd", &days); err == nil { + return time.Duration(days) * 24 * time.Hour, nil + } + } + return time.ParseDuration(s) +} diff --git a/cmd/exitnode-mcp/tools_test.go b/cmd/exitnode-mcp/tools_test.go new file mode 100644 index 0000000..076b74a --- /dev/null +++ b/cmd/exitnode-mcp/tools_test.go @@ -0,0 +1,37 @@ +package main + +import ( + "testing" + + "github.com/modelcontextprotocol/go-sdk/mcp" +) + +// TestRegisterTools_RegistersAllTen verifies that calling registerTools does +// not panic and registers exactly the 10 expected tool names. +// The MCP SDK (v1.6.0) does not expose a public listing API on *mcp.Server, so +// this is a no-panic smoke test. Protocol-level tool enumeration is covered by +// Task 16+ integration tests. +func TestRegisterTools_RegistersAllTen(t *testing.T) { + s := mcp.NewServer(&mcp.Implementation{Name: "test", Version: "0"}, nil) + registerTools(s) // must not panic + + // Enumerate expected names to document the contract even though we cannot + // assert them via the SDK's public API at this point. + wantNames := []string{ + "provision_exit_node", + "start_exit_node", + "stop_exit_node", + "destroy_exit_node", + "rotate_exit_node", + "list_exit_nodes", + "get_status", + "verify_connectivity", + "sync_pfsense_gateway", + "estimate_cost", + } + if len(wantNames) != 10 { + t.Fatalf("test bug: expected 10 tools, listed %d", len(wantNames)) + } + // If a future SDK version exposes Server.ListTools() or similar, replace + // this comment with an assertion over wantNames. +} diff --git a/cmd/exitnode/cost.go b/cmd/exitnode/cost.go new file mode 100644 index 0000000..95b455f --- /dev/null +++ b/cmd/exitnode/cost.go @@ -0,0 +1,70 @@ +package main + +import ( + "context" + "fmt" + "os" + "time" + + "github.com/spf13/cobra" + + "github.com/iker/exit-node/internal/core" +) + +func newCostCmd(opts *rootOpts) *cobra.Command { + var period string + cmd := &cobra.Command{ + Use: "cost", + Short: "Estimate spend for the active exit node", + RunE: func(cmd *cobra.Command, args []string) error { + ctx := context.Background() + c, cleanup, err := opts.buildCore(ctx) + if err != nil { + return err + } + defer cleanup() + + var d time.Duration + if period != "" { + p, err := parsePeriod(period) + if err != nil { + return err + } + d = p + } + + r, err := c.EstimateCost(ctx, core.CostOpts{Period: d}) + if err != nil { + return fmt.Errorf("cost: %w", err) + } + if opts.json { + return renderJSON(os.Stdout, r) + } + renderKV(os.Stdout, "machine_type", r.MachineType) + renderKV(os.Stdout, "hours", fmt.Sprintf("%.2f", r.Hours)) + renderKV(os.Stdout, "usd_per_hour", fmt.Sprintf("%.4f", r.USDPerHour)) + renderKV(os.Stdout, "usd", fmt.Sprintf("%.2f", r.USD)) + if r.Note != "" { + renderKV(os.Stdout, "note", r.Note) + } + return nil + }, + } + cmd.Flags().StringVar(&period, "period", "", "Look-back window: 24h, 7d, month (default: since node creation)") + return cmd +} + +// parsePeriod accepts a few user-friendly aliases on top of Go's +// time.ParseDuration. "month" means 30 days; "Nd" means N days. +func parsePeriod(s string) (time.Duration, error) { + if s == "month" { + return 30 * 24 * time.Hour, nil + } + if len(s) > 1 && s[len(s)-1] == 'd' { + var days int + if _, err := fmt.Sscanf(s, "%dd", &days); err == nil { + return time.Duration(days) * 24 * time.Hour, nil + } + } + return time.ParseDuration(s) +} diff --git a/cmd/exitnode/cost_test.go b/cmd/exitnode/cost_test.go new file mode 100644 index 0000000..d909e27 --- /dev/null +++ b/cmd/exitnode/cost_test.go @@ -0,0 +1,28 @@ +package main + +import ( + "testing" + "time" +) + +func TestParsePeriod(t *testing.T) { + cases := []struct { + in string + want time.Duration + }{ + {"24h", 24 * time.Hour}, + {"7d", 7 * 24 * time.Hour}, + {"month", 30 * 24 * time.Hour}, + {"30m", 30 * time.Minute}, + } + for _, tc := range cases { + got, err := parsePeriod(tc.in) + if err != nil { + t.Errorf("parsePeriod(%q) err=%v", tc.in, err) + continue + } + if got != tc.want { + t.Errorf("parsePeriod(%q) = %v, want %v", tc.in, got, tc.want) + } + } +} diff --git a/cmd/exitnode/down.go b/cmd/exitnode/down.go new file mode 100644 index 0000000..89567ed --- /dev/null +++ b/cmd/exitnode/down.go @@ -0,0 +1,32 @@ +package main + +import ( + "context" + "fmt" + + "github.com/spf13/cobra" + + "github.com/iker/exit-node/internal/core" +) + +func newDownCmd(opts *rootOpts) *cobra.Command { + var destroy bool + cmd := &cobra.Command{ + Use: "down", + Short: "Stop (or with --destroy, terminate) the currently active exit node", + RunE: func(cmd *cobra.Command, args []string) error { + ctx := context.Background() + c, cleanup, err := opts.buildCore(ctx) + if err != nil { + return err + } + defer cleanup() + if err := c.Down(ctx, core.DownOpts{Destroy: destroy}); err != nil { + return fmt.Errorf("down: %w", err) + } + return nil + }, + } + cmd.Flags().BoolVar(&destroy, "destroy", false, "Destroy the VM + tailscale device (default: stop only)") + return cmd +} diff --git a/cmd/exitnode/health.go b/cmd/exitnode/health.go new file mode 100644 index 0000000..06c7bb7 --- /dev/null +++ b/cmd/exitnode/health.go @@ -0,0 +1,42 @@ +package main + +import ( + "context" + "fmt" + "os" + + "github.com/spf13/cobra" +) + +func newHealthCmd(opts *rootOpts) *cobra.Command { + return &cobra.Command{ + Use: "health", + Short: "Probe egress through the active exit node", + RunE: func(cmd *cobra.Command, args []string) error { + ctx := context.Background() + c, cleanup, err := opts.buildCore(ctx) + if err != nil { + return err + } + defer cleanup() + + h, err := c.Health(ctx) + if err != nil { + return fmt.Errorf("health: %w", err) + } + if opts.json { + return renderJSON(os.Stdout, h) + } + renderKV(os.Stdout, "ok", h.OK) + renderKV(os.Stdout, "egress_ip", h.EgressIP) + renderKV(os.Stdout, "expected_ip", h.ExpectedIP) + if h.ProbeErr != nil { + renderKV(os.Stdout, "probe_err", h.ProbeErr.Error()) + } + if !h.OK { + os.Exit(2) + } + return nil + }, + } +} diff --git a/cmd/exitnode/list.go b/cmd/exitnode/list.go new file mode 100644 index 0000000..3274964 --- /dev/null +++ b/cmd/exitnode/list.go @@ -0,0 +1,41 @@ +package main + +import ( + "context" + "fmt" + "os" + + "github.com/spf13/cobra" +) + +func newListCmd(opts *rootOpts) *cobra.Command { + return &cobra.Command{ + Use: "list", + Short: "List all exitnode-managed VMs in the GCP project", + RunE: func(cmd *cobra.Command, args []string) error { + ctx := context.Background() + c, cleanup, err := opts.buildCore(ctx) + if err != nil { + return err + } + defer cleanup() + + nodes, err := c.List(ctx) + if err != nil { + return fmt.Errorf("list: %w", err) + } + if opts.json { + return renderJSON(os.Stdout, nodes) + } + if len(nodes) == 0 { + fmt.Fprintln(os.Stdout, "(no exitnode-managed VMs found)") + return nil + } + fmt.Fprintf(os.Stdout, "%-32s %-14s %-12s %s\n", "NAME", "REGION", "STATE", "PUBLIC_IP") + for _, n := range nodes { + fmt.Fprintf(os.Stdout, "%-32s %-14s %-12v %s\n", n.Name, n.Region, n.State, n.PublicIP) + } + return nil + }, + } +} diff --git a/cmd/exitnode/main.go b/cmd/exitnode/main.go new file mode 100644 index 0000000..b17e426 --- /dev/null +++ b/cmd/exitnode/main.go @@ -0,0 +1,20 @@ +package main + +import ( + "fmt" + "os" +) + +// Populated by goreleaser via -ldflags "-X main.version=...". +var ( + version = "dev" + commit = "none" + date = "unknown" +) + +func main() { + if err := newRootCmd().Execute(); err != nil { + fmt.Fprintln(os.Stderr, "exitnode:", err) + os.Exit(1) + } +} diff --git a/cmd/exitnode/pfsense.go b/cmd/exitnode/pfsense.go new file mode 100644 index 0000000..8e56817 --- /dev/null +++ b/cmd/exitnode/pfsense.go @@ -0,0 +1,32 @@ +package main + +import ( + "context" + "fmt" + + "github.com/spf13/cobra" +) + +func newPFSenseCmd(opts *rootOpts) *cobra.Command { + cmd := &cobra.Command{ + Use: "pfsense", + Short: "pfSense gateway operations", + } + cmd.AddCommand(&cobra.Command{ + Use: "sync", + Short: "Push the active node's Tailscale IP to the configured pfSense gateway", + RunE: func(cmd *cobra.Command, args []string) error { + ctx := context.Background() + c, cleanup, err := opts.buildCore(ctx) + if err != nil { + return err + } + defer cleanup() + if err := c.SyncPFSense(ctx); err != nil { + return fmt.Errorf("pfsense sync: %w", err) + } + return nil + }, + }) + return cmd +} diff --git a/cmd/exitnode/render.go b/cmd/exitnode/render.go new file mode 100644 index 0000000..5ee716a --- /dev/null +++ b/cmd/exitnode/render.go @@ -0,0 +1,19 @@ +package main + +import ( + "encoding/json" + "fmt" + "io" +) + +// renderJSON marshals v to w as indented JSON. +func renderJSON(w io.Writer, v any) error { + enc := json.NewEncoder(w) + enc.SetIndent("", " ") + return enc.Encode(v) +} + +// renderKV prints a key=value pair line. +func renderKV(w io.Writer, key string, val any) { + fmt.Fprintf(w, "%-14s %v\n", key+":", val) +} diff --git a/cmd/exitnode/root.go b/cmd/exitnode/root.go new file mode 100644 index 0000000..ec08519 --- /dev/null +++ b/cmd/exitnode/root.go @@ -0,0 +1,146 @@ +package main + +import ( + "context" + "errors" + "fmt" + "log/slog" + "os" + "path/filepath" + + "github.com/spf13/cobra" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/core" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/pfsense" + "github.com/iker/exit-node/internal/state" + "github.com/iker/exit-node/internal/tailscale" + "github.com/iker/exit-node/internal/verify" +) + +// rootOpts collects the global flags. One instance per process; subcommands +// read from it via closure. +type rootOpts struct { + configPath string + json bool + verbose bool +} + +func newRootCmd() *cobra.Command { + opts := &rootOpts{} + + cmd := &cobra.Command{ + Use: "exitnode", + Short: "On-demand Tailscale exit nodes that rotate across cloud regions", + SilenceUsage: true, + SilenceErrors: true, + } + + cmd.Version = fmt.Sprintf("%s (commit %s, %s)", version, commit, date) + + cmd.PersistentFlags().StringVar(&opts.configPath, "config", defaultConfigPath(), "Path to config.toml") + cmd.PersistentFlags().BoolVar(&opts.json, "json", false, "Machine-readable JSON output") + cmd.PersistentFlags().BoolVarP(&opts.verbose, "verbose", "v", false, "Verbose (debug) logging") + + cmd.AddCommand( + newUpCmd(opts), + newDownCmd(opts), + newRotateCmd(opts), + newListCmd(opts), + newStatusCmd(opts), + newHealthCmd(opts), + newPFSenseCmd(opts), + newCostCmd(opts), + ) + return cmd +} + +func defaultConfigPath() string { + if xdg := os.Getenv("XDG_CONFIG_HOME"); xdg != "" { + return filepath.Join(xdg, "exitnode", "config.toml") + } + home, _ := os.UserHomeDir() + return filepath.Join(home, ".config", "exitnode", "config.toml") +} + +func defaultStatePath() string { + if xdg := os.Getenv("XDG_CONFIG_HOME"); xdg != "" { + return filepath.Join(xdg, "exitnode", "state.json") + } + home, _ := os.UserHomeDir() + return filepath.Join(home, ".config", "exitnode", "state.json") +} + +// buildCore loads config + secrets, opens the state store, and constructs +// a *core.Core with real client implementations wired in. Returned cleanup +// must always be called (releases the state lock). +func (o *rootOpts) buildCore(ctx context.Context) (*core.Core, func(), error) { + cfg, err := config.Load(o.configPath) + if err != nil { + return nil, func() {}, fmt.Errorf("load config: %w", err) + } + + tsID, tsSecret, err := cfg.ResolveTailscaleSecrets() + if err != nil { + return nil, func() {}, err + } + pfKey, err := cfg.ResolvePFSenseAPIKey() + if err != nil { + return nil, func() {}, err + } + _, gcpJSON, err := cfg.ResolveGCPCredentials() + if err != nil { + return nil, func() {}, err + } + + provider, err := gcp.New(ctx, gcp.Options{ + Project: cfg.GCP.Project, + Region: cfg.GCP.DefaultRegion, + CredentialsJSON: gcpJSON, + Network: cfg.GCP.Network, + InstallScriptURL: cfg.Behavior.InstallScriptURL, + }) + if err != nil { + return nil, func() {}, fmt.Errorf("gcp client: %w", err) + } + + ts, err := tailscale.New(tailscale.Options{ + Tailnet: cfg.Tailscale.Tailnet, + ClientID: tsID, + ClientSecret: tsSecret, + }) + if err != nil { + return nil, func() {}, fmt.Errorf("tailscale client: %w", err) + } + + pf, err := pfsense.New(pfsense.Options{ + BaseURL: cfg.PFSense.Host, + APIKey: pfKey, + VerifyTLS: cfg.PFSense.VerifyTLS, + }) + if err != nil { + return nil, func() {}, fmt.Errorf("pfsense client: %w", err) + } + + probe := verify.New(cfg.Behavior.ProbeURL) + + store, err := state.Open(defaultStatePath()) + if err != nil { + if errors.Is(err, state.ErrLocked) { + return nil, func() {}, fmt.Errorf("another exitnode process is running (state.json locked)") + } + return nil, func() {}, fmt.Errorf("open state: %w", err) + } + + level := slog.LevelInfo + if o.verbose { + level = slog.LevelDebug + } + log := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: level})) + + c := core.New(core.Deps{ + Config: cfg, Provider: provider, TS: ts, PF: pf, Probe: probe, Store: store, Logger: log, + }) + return c, func() { _ = store.Close() }, nil +} diff --git a/cmd/exitnode/root_test.go b/cmd/exitnode/root_test.go new file mode 100644 index 0000000..2f8d37b --- /dev/null +++ b/cmd/exitnode/root_test.go @@ -0,0 +1,22 @@ +package main + +import ( + "bytes" + "strings" + "testing" +) + +func TestRootCmd_Help_ListsAllSubcommands(t *testing.T) { + cmd := newRootCmd() + buf := &bytes.Buffer{} + cmd.SetOut(buf) + cmd.SetArgs([]string{"--help"}) + if err := cmd.Execute(); err != nil { + t.Fatalf("execute: %v", err) + } + for _, sub := range []string{"up", "down", "rotate", "list", "status", "health", "pfsense", "cost"} { + if !strings.Contains(buf.String(), sub) { + t.Errorf("help output missing subcommand %q\nfull output:\n%s", sub, buf.String()) + } + } +} diff --git a/cmd/exitnode/rotate.go b/cmd/exitnode/rotate.go new file mode 100644 index 0000000..e3ae932 --- /dev/null +++ b/cmd/exitnode/rotate.go @@ -0,0 +1,45 @@ +package main + +import ( + "context" + "fmt" + "os" + + "github.com/spf13/cobra" + + "github.com/iker/exit-node/internal/core" +) + +func newRotateCmd(opts *rootOpts) *cobra.Command { + var region string + cmd := &cobra.Command{ + Use: "rotate", + Short: "Provision a new exit node, cut pfSense over, destroy the old one", + RunE: func(cmd *cobra.Command, args []string) error { + ctx := context.Background() + c, cleanup, err := opts.buildCore(ctx) + if err != nil { + return err + } + defer cleanup() + + res, err := c.Rotate(ctx, core.RotateOpts{Region: region}) + if err != nil { + return fmt.Errorf("rotate: %w", err) + } + if opts.json { + return renderJSON(os.Stdout, res) + } + fmt.Fprintln(os.Stdout, "rotated:") + if res.Old != nil { + renderKV(os.Stdout, "old", res.Old.Name) + } + if res.New != nil { + renderKV(os.Stdout, "new", res.New.Name) + } + return nil + }, + } + cmd.Flags().StringVar(®ion, "region", "", "GCP region for the new node (overrides config default)") + return cmd +} diff --git a/cmd/exitnode/status.go b/cmd/exitnode/status.go new file mode 100644 index 0000000..b0ff9e8 --- /dev/null +++ b/cmd/exitnode/status.go @@ -0,0 +1,46 @@ +package main + +import ( + "context" + "fmt" + "os" + + "github.com/spf13/cobra" +) + +func newStatusCmd(opts *rootOpts) *cobra.Command { + return &cobra.Command{ + Use: "status", + Short: "Show the currently active exit node and any state drift", + RunE: func(cmd *cobra.Command, args []string) error { + ctx := context.Background() + c, cleanup, err := opts.buildCore(ctx) + if err != nil { + return err + } + defer cleanup() + + s, err := c.Status(ctx) + if err != nil { + return fmt.Errorf("status: %w", err) + } + if opts.json { + return renderJSON(os.Stdout, s) + } + if s.Cached == nil { + fmt.Fprintln(os.Stdout, "no active exit node") + return nil + } + renderKV(os.Stdout, "name", s.Cached.Name) + renderKV(os.Stdout, "region", s.Cached.Region) + if s.Live != nil { + renderKV(os.Stdout, "live_state", s.Live.State) + renderKV(os.Stdout, "public_ip", s.Live.PublicIP) + } + if s.Drift() { + fmt.Fprintln(os.Stdout, "(state drift detected — run `exitnode list` to inspect)") + } + return nil + }, + } +} diff --git a/cmd/exitnode/up.go b/cmd/exitnode/up.go new file mode 100644 index 0000000..cfbce10 --- /dev/null +++ b/cmd/exitnode/up.go @@ -0,0 +1,48 @@ +package main + +import ( + "context" + "fmt" + "os" + + "github.com/spf13/cobra" + + "github.com/iker/exit-node/internal/core" +) + +func newUpCmd(opts *rootOpts) *cobra.Command { + var ( + region string + machineType string + ) + cmd := &cobra.Command{ + Use: "up", + Short: "Provision an exit node (idempotent — returns the active one if it exists)", + RunE: func(cmd *cobra.Command, args []string) error { + ctx := context.Background() + c, cleanup, err := opts.buildCore(ctx) + if err != nil { + return err + } + defer cleanup() + + node, err := c.Up(ctx, core.UpOpts{Region: region, MachineType: machineType}) + if err != nil { + return fmt.Errorf("up: %w", err) + } + return renderNode(os.Stdout, opts.json, node) + }, + } + cmd.Flags().StringVar(®ion, "region", "", "GCP region (overrides config default)") + cmd.Flags().StringVar(&machineType, "machine", "", "GCP machine type (overrides config default)") + return cmd +} + +func renderNode(w *os.File, asJSON bool, n any) error { + if asJSON { + return renderJSON(w, n) + } + // Type-assert to gcp.ExitNode is fine because callers pass that type. + fmt.Fprintln(w, n) + return nil +} diff --git a/examples/config.toml b/examples/config.toml new file mode 100644 index 0000000..620c183 --- /dev/null +++ b/examples/config.toml @@ -0,0 +1,76 @@ +# exitnode — reference configuration. +# +# Copy this file to ~/.config/exitnode/config.toml and edit the values +# for your environment. All env-var names are configurable here so that +# you can pick whatever naming convention your secret store uses. + +[gcp] +# GCP project ID that hosts the exit-node VMs. +project = "my-gcp-project" +# Default region used by `exitnode up` and `exitnode rotate` when no +# --region flag is given. +default_region = "us-west1" +# Default machine type. e2-micro is the cheapest x86_64; e2-small is +# the cheapest with more than 1 vCPU. +default_machine_type = "e2-micro" +# Default zone within the region. Empty → exit-node picks a random +# UP zone in the region at provision time. +default_zone = "" +# VPC network name. "default" is the auto-created VPC every GCP +# project starts with. +network = "default" +# Boot disk size in GiB. The image is debian-12; 10 GiB is comfortably +# above the image's actual footprint. +disk_size_gb = 10 + +[tailscale] +# Your tailnet name — visible at the top of the Tailscale admin console. +tailnet = "example.com" +# Env-var names holding the OAuth client-credentials. Both are required. +# Create the OAuth client at https://login.tailscale.com/admin/settings/oauth +# with scopes "auth_keys" (write) and "devices:core" (write). +oauth_client_id_env = "TAILSCALE_OAUTH_CLIENT_ID" +oauth_client_secret_env = "TAILSCALE_OAUTH_CLIENT_SECRET" +# Tags applied to every provisioned device. Must be defined in your +# tailnet's ACL `tagOwners`. +tags = ["tag:exit-node"] +# How long the ephemeral auth key minted for each new VM remains valid +# before Tailscale rejects it. 5m is generous — the VM consumes the key +# on first boot, usually within 60 seconds. +ephemeral_key_ttl = "5m" + +[pfsense] +# pfSense webConfigurator host or IP. No trailing slash. +host = "https://pfsense.lan" +# Env-var name holding the pfsense-api plugin API key. +api_key_env = "PFSENSE_API_KEY" +# Name of the gateway you've configured in System → Routing → Gateways +# that points at the Tailscale interface. exitnode patches its +# monitor-IP to follow the active exit node. +gateway_name = "TAILSCALE_VPN_GW" +# Set false to skip TLS verification (only safe for the default +# self-signed cert on a trusted LAN). +verify_tls = true + +[behavior] +# When true, every `exitnode up` and `exitnode rotate` runs the +# pfsense sync step automatically. Set false if you want to drive +# pfsense sync manually via `exitnode pfsense sync`. +auto_sync_pfsense = true +# Pre-cutover probe — verifies egress through the candidate node +# from your orchestrator host BEFORE swapping pfSense over. Strongly +# recommended. +verify_pre_cutover = true +# Post-cutover probe — re-verifies egress through the LAN gateway +# AFTER pfSense is swapped. Default off because it requires the +# orchestrator host to use pfSense as its default route. +verify_post_cutover = false +# Public probe URL. Anything that returns the caller's IP as plain +# text works (api.ipify.org, ifconfig.me, etc.). +probe_url = "https://api.ipify.org" +# How long exitnode will wait for the new VM's Tailscale device to +# appear in the API after provision. +registration_timeout = "90s" +# Public URL of scripts/install.sh — fetched by the VM startup script. +# Point at your fork's main branch (or a tagged release for stability). +install_script_url = "https://raw.githubusercontent.com/USER/exit-node/main/scripts/install.sh" diff --git a/examples/mcp.json b/examples/mcp.json new file mode 100644 index 0000000..bf30dc7 --- /dev/null +++ b/examples/mcp.json @@ -0,0 +1,13 @@ +{ + "mcpServers": { + "exitnode": { + "command": "exitnode-mcp", + "args": [], + "env": { + "TAILSCALE_OAUTH_CLIENT_ID": "$TAILSCALE_OAUTH_CLIENT_ID", + "TAILSCALE_OAUTH_CLIENT_SECRET": "$TAILSCALE_OAUTH_CLIENT_SECRET", + "PFSENSE_API_KEY": "$PFSENSE_API_KEY" + } + } + } +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..4c111e1 --- /dev/null +++ b/go.mod @@ -0,0 +1,48 @@ +module github.com/iker/exit-node + +go 1.25.0 + +require ( + cloud.google.com/go/compute v1.62.0 + github.com/BurntSushi/toml v1.6.0 + github.com/gofrs/flock v0.13.0 + github.com/modelcontextprotocol/go-sdk v1.6.0 + github.com/spf13/cobra v1.10.2 + google.golang.org/api v0.278.0 + google.golang.org/protobuf v1.36.11 + tailscale.com/client/tailscale/v2 v2.9.0 +) + +require ( + cloud.google.com/go/auth v0.20.0 // indirect + cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect + cloud.google.com/go/compute/metadata v0.9.0 // indirect + github.com/cespare/xxhash/v2 v2.3.0 // indirect + github.com/felixge/httpsnoop v1.0.4 // indirect + github.com/go-logr/logr v1.4.3 // indirect + github.com/go-logr/stdr v1.2.2 // indirect + github.com/google/jsonschema-go v0.4.3 // indirect + github.com/google/s2a-go v0.1.9 // indirect + github.com/googleapis/enterprise-certificate-proxy v0.3.15 // indirect + github.com/googleapis/gax-go/v2 v2.22.0 // indirect + github.com/inconshreveable/mousetrap v1.1.0 // indirect + github.com/segmentio/asm v1.1.3 // indirect + github.com/segmentio/encoding v0.5.4 // indirect + github.com/spf13/pflag v1.0.9 // indirect + github.com/tailscale/hujson v0.0.0-20220506213045-af5ed07155e5 // indirect + github.com/yosida95/uritemplate/v3 v3.0.2 // indirect + go.opentelemetry.io/auto/sdk v1.2.1 // indirect + go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.67.0 // indirect + go.opentelemetry.io/otel v1.43.0 // indirect + go.opentelemetry.io/otel/metric v1.43.0 // indirect + go.opentelemetry.io/otel/trace v1.43.0 // indirect + golang.org/x/crypto v0.50.0 // indirect + golang.org/x/net v0.53.0 // indirect + golang.org/x/oauth2 v0.36.0 // indirect + golang.org/x/sys v0.43.0 // indirect + golang.org/x/text v0.36.0 // indirect + google.golang.org/genproto v0.0.0-20260319201613-d00831a3d3e7 // indirect + google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20260427160629-7cedc36a6bc4 // indirect + google.golang.org/grpc v1.80.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..4ef83ed --- /dev/null +++ b/go.sum @@ -0,0 +1,111 @@ +cloud.google.com/go v0.123.0 h1:2NAUJwPR47q+E35uaJeYoNhuNEM9kM8SjgRgdeOJUSE= +cloud.google.com/go v0.123.0/go.mod h1:xBoMV08QcqUGuPW65Qfm1o9Y4zKZBpGS+7bImXLTAZU= +cloud.google.com/go/auth v0.20.0 h1:kXTssoVb4azsVDoUiF8KvxAqrsQcQtB53DcSgta74CA= +cloud.google.com/go/auth v0.20.0/go.mod h1:942/yi/itH1SsmpyrbnTMDgGfdy2BUqIKyd0cyYLc5Q= +cloud.google.com/go/auth/oauth2adapt v0.2.8 h1:keo8NaayQZ6wimpNSmW5OPc283g65QNIiLpZnkHRbnc= +cloud.google.com/go/auth/oauth2adapt v0.2.8/go.mod h1:XQ9y31RkqZCcwJWNSx2Xvric3RrU88hAYYbjDWYDL+c= +cloud.google.com/go/compute v1.62.0 h1:tJ7lKJ8YEVa6vZX03Jc8o1YePbjKDOQhDw1BscMZ1bs= +cloud.google.com/go/compute v1.62.0/go.mod h1:Xm6PbsLgBpAg4va77ljbBdpMjzuU+uPp5Ze2dnZq7lw= 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v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco= +gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +tailscale.com/client/tailscale/v2 v2.9.0 h1:zBZIIeIYXL42qvvile7d29O2DKSr3AfNc2gzd1JCf2o= +tailscale.com/client/tailscale/v2 v2.9.0/go.mod h1:FGjvGT3ThHelqo0gfdK3IN3k1dwNbRzYbQh2XO3C47U= diff --git a/internal/config/config.go b/internal/config/config.go new file mode 100644 index 0000000..fee64b6 --- /dev/null +++ b/internal/config/config.go @@ -0,0 +1,111 @@ +// Package config loads exitnode's TOML config and resolves secrets from +// the environment. +package config + +import ( + "fmt" + "os" + "time" + + "github.com/BurntSushi/toml" +) + +// Config is the root config struct, populated from TOML. +type Config struct { + GCP GCPConfig `toml:"gcp"` + Tailscale TailscaleConfig `toml:"tailscale"` + PFSense PFSenseConfig `toml:"pfsense"` + Behavior BehaviorConfig `toml:"behavior"` +} + +type GCPConfig struct { + Project string `toml:"project"` + DefaultRegion string `toml:"default_region"` + DefaultMachineType string `toml:"default_machine_type"` + DefaultZone string `toml:"default_zone"` + Network string `toml:"network"` + DiskSizeGB int `toml:"disk_size_gb"` +} + +type TailscaleConfig struct { + Tailnet string `toml:"tailnet"` + OAuthClientIDEnv string `toml:"oauth_client_id_env"` + OAuthClientSecretEnv string `toml:"oauth_client_secret_env"` + Tags []string `toml:"tags"` + EphemeralKeyTTL time.Duration `toml:"ephemeral_key_ttl"` +} + +type PFSenseConfig struct { + Host string `toml:"host"` + APIKeyEnv string `toml:"api_key_env"` + GatewayName string `toml:"gateway_name"` + VerifyTLS bool `toml:"verify_tls"` +} + +type BehaviorConfig struct { + AutoSyncPFSense bool `toml:"auto_sync_pfsense"` + VerifyPreCutover bool `toml:"verify_pre_cutover"` + VerifyPostCutover bool `toml:"verify_post_cutover"` + ProbeURL string `toml:"probe_url"` + RegistrationTimeout time.Duration `toml:"registration_timeout"` + InstallScriptURL string `toml:"install_script_url"` +} + +// Load reads and parses the TOML config at path. +func Load(path string) (*Config, error) { + b, err := os.ReadFile(path) + if err != nil { + return nil, fmt.Errorf("read config %s: %w", path, err) + } + var cfg Config + if err := toml.Unmarshal(b, &cfg); err != nil { + return nil, fmt.Errorf("parse config %s: %w", path, err) + } + return &cfg, nil +} + +// ResolveTailscaleSecrets reads the OAuth client id and secret from the env +// var names declared in the TOML config. Both must be set. +func (c *Config) ResolveTailscaleSecrets() (clientID, clientSecret string, err error) { + if c.Tailscale.OAuthClientIDEnv == "" || c.Tailscale.OAuthClientSecretEnv == "" { + return "", "", fmt.Errorf("config tailscale.oauth_client_id_env / oauth_client_secret_env must be set") + } + clientID = os.Getenv(c.Tailscale.OAuthClientIDEnv) + clientSecret = os.Getenv(c.Tailscale.OAuthClientSecretEnv) + if clientID == "" || clientSecret == "" { + return "", "", fmt.Errorf("tailscale OAuth env vars %s / %s are unset", + c.Tailscale.OAuthClientIDEnv, c.Tailscale.OAuthClientSecretEnv) + } + return clientID, clientSecret, nil +} + +// ResolvePFSenseAPIKey reads the pfSense API key from the configured env var. +func (c *Config) ResolvePFSenseAPIKey() (string, error) { + if c.PFSense.APIKeyEnv == "" { + return "", fmt.Errorf("config pfsense.api_key_env must be set") + } + key := os.Getenv(c.PFSense.APIKeyEnv) + if key == "" { + return "", fmt.Errorf("pfsense API key env var %s is unset", c.PFSense.APIKeyEnv) + } + return key, nil +} + +// GCPCredSource identifies where the GCP credentials came from. +type GCPCredSource int + +const ( + GCPSourceADC GCPCredSource = iota + GCPSourceEnvJSON +) + +// ResolveGCPCredentials returns the GCP credentials source and, when the +// source is GCPSourceEnvJSON, the JSON payload bytes. For GCPSourceADC the +// caller is expected to use google.FindDefaultCredentials and the payload +// will be empty. +func (c *Config) ResolveGCPCredentials() (GCPCredSource, []byte, error) { + if envJSON := os.Getenv("GCP_CREDENTIALS_JSON"); envJSON != "" { + return GCPSourceEnvJSON, []byte(envJSON), nil + } + return GCPSourceADC, nil, nil +} diff --git a/internal/config/config_test.go b/internal/config/config_test.go new file mode 100644 index 0000000..bef8ee8 --- /dev/null +++ b/internal/config/config_test.go @@ -0,0 +1,174 @@ +package config + +import ( + "os" + "path/filepath" + "testing" + "time" +) + +const minimalToml = ` +[gcp] +project = "test-proj" +default_region = "us-west1" +default_machine_type = "e2-micro" +network = "default" +disk_size_gb = 10 + +[tailscale] +tailnet = "example.com" +oauth_client_id_env = "TS_ID" +oauth_client_secret_env = "TS_SECRET" +tags = ["tag:exit-node"] +ephemeral_key_ttl = "5m" + +[pfsense] +host = "10.0.0.1" +api_key_env = "PF_KEY" +gateway_name = "GW" +verify_tls = true + +[behavior] +auto_sync_pfsense = true +verify_pre_cutover = true +verify_post_cutover = false +probe_url = "https://api.ipify.org" +registration_timeout = "90s" +install_script_url = "https://example.com/install.sh" +` + +func writeToml(t *testing.T, body string) string { + t.Helper() + dir := t.TempDir() + p := filepath.Join(dir, "config.toml") + if err := os.WriteFile(p, []byte(body), 0o600); err != nil { + t.Fatalf("write: %v", err) + } + return p +} + +func TestLoadMinimal(t *testing.T) { + p := writeToml(t, minimalToml) + cfg, err := Load(p) + if err != nil { + t.Fatalf("Load: %v", err) + } + if cfg.GCP.Project != "test-proj" { + t.Errorf("GCP.Project = %q, want %q", cfg.GCP.Project, "test-proj") + } + if cfg.GCP.DefaultMachineType != "e2-micro" { + t.Errorf("GCP.DefaultMachineType = %q", cfg.GCP.DefaultMachineType) + } + if cfg.Tailscale.Tailnet != "example.com" { + t.Errorf("Tailscale.Tailnet = %q", cfg.Tailscale.Tailnet) + } + if cfg.Behavior.RegistrationTimeout != 90*time.Second { + t.Errorf("RegistrationTimeout = %v, want 90s", cfg.Behavior.RegistrationTimeout) + } + if !cfg.Behavior.VerifyPreCutover { + t.Errorf("VerifyPreCutover should be true") + } + if cfg.Behavior.VerifyPostCutover { + t.Errorf("VerifyPostCutover should be false") + } +} + +func TestResolveTailscaleSecrets(t *testing.T) { + p := writeToml(t, minimalToml) + cfg, err := Load(p) + if err != nil { + t.Fatalf("Load: %v", err) + } + t.Setenv("TS_ID", "client-id-1") + t.Setenv("TS_SECRET", "client-secret-1") + + id, sec, err := cfg.ResolveTailscaleSecrets() + if err != nil { + t.Fatalf("ResolveTailscaleSecrets: %v", err) + } + if id != "client-id-1" || sec != "client-secret-1" { + t.Errorf("got (%q, %q), want (client-id-1, client-secret-1)", id, sec) + } +} + +func TestResolveTailscaleSecretsMissing(t *testing.T) { + p := writeToml(t, minimalToml) + cfg, err := Load(p) + if err != nil { + t.Fatalf("Load: %v", err) + } + t.Setenv("TS_ID", "") + t.Setenv("TS_SECRET", "") + + if _, _, err := cfg.ResolveTailscaleSecrets(); err == nil { + t.Errorf("expected error when env vars unset") + } +} + +func TestResolvePFSenseAPIKey(t *testing.T) { + p := writeToml(t, minimalToml) + cfg, err := Load(p) + if err != nil { + t.Fatalf("Load: %v", err) + } + t.Setenv("PF_KEY", "pfkey-1") + key, err := cfg.ResolvePFSenseAPIKey() + if err != nil { + t.Fatalf("ResolvePFSenseAPIKey: %v", err) + } + if key != "pfkey-1" { + t.Errorf("key = %q, want pfkey-1", key) + } +} + +func TestResolveGCPCredentialsEnvJSONOverridesADC(t *testing.T) { + // When GCP_CREDENTIALS_JSON is set, it wins. + p := writeToml(t, minimalToml) + cfg, err := Load(p) + if err != nil { + t.Fatalf("Load: %v", err) + } + t.Setenv("GCP_CREDENTIALS_JSON", `{"type":"service_account","project_id":"x"}`) + src, payload, err := cfg.ResolveGCPCredentials() + if err != nil { + t.Fatalf("ResolveGCPCredentials: %v", err) + } + if src != GCPSourceEnvJSON { + t.Errorf("source = %v, want GCPSourceEnvJSON", src) + } + if string(payload) == "" { + t.Errorf("payload should not be empty when env JSON is set") + } +} + +func TestResolveGCPCredentialsFallsBackToADC(t *testing.T) { + p := writeToml(t, minimalToml) + cfg, err := Load(p) + if err != nil { + t.Fatalf("Load: %v", err) + } + t.Setenv("GCP_CREDENTIALS_JSON", "") // explicitly clear + src, payload, err := cfg.ResolveGCPCredentials() + if err != nil { + t.Fatalf("ResolveGCPCredentials: %v", err) + } + if src != GCPSourceADC { + t.Errorf("source = %v, want GCPSourceADC", src) + } + if len(payload) != 0 { + t.Errorf("ADC payload should be empty (resolved later by google sdk)") + } +} + +func TestExampleConfigParses(t *testing.T) { + cfg, err := Load("../../examples/config.toml") + if err != nil { + t.Fatalf("Load examples/config.toml: %v", err) + } + if cfg.GCP.Project == "" || cfg.Tailscale.Tailnet == "" || cfg.PFSense.Host == "" { + t.Errorf("example config has empty top-level values: %+v", cfg) + } + if cfg.Tailscale.EphemeralKeyTTL == 0 { + t.Errorf("example config did not parse the duration: %+v", cfg.Tailscale) + } +} diff --git a/internal/core/core.go b/internal/core/core.go new file mode 100644 index 0000000..108b8b2 --- /dev/null +++ b/internal/core/core.go @@ -0,0 +1,56 @@ +// Package core implements the orchestration logic for exitnode: rotate, +// up/down, status, health, sync, and cost. All external IO is abstracted +// through interfaces (gcp.Provider, tailscale.TailscaleClient, +// pfsense.PFSenseClient, verify.Probe) so this package can be exercised +// with hand-written mocks. +package core + +import ( + "log/slog" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/pfsense" + "github.com/iker/exit-node/internal/state" + "github.com/iker/exit-node/internal/tailscale" + "github.com/iker/exit-node/internal/verify" +) + +// Core wires the orchestrator's dependencies. +type Core struct { + cfg *config.Config + provider gcp.Provider + ts tailscale.TailscaleClient + pf pfsense.PFSenseClient + probe verify.Probe + store *state.Store + log *slog.Logger +} + +// Deps groups the constructor inputs. +type Deps struct { + Config *config.Config + Provider gcp.Provider + TS tailscale.TailscaleClient + PF pfsense.PFSenseClient + Probe verify.Probe + Store *state.Store + Logger *slog.Logger +} + +// New constructs a Core. Logger defaults to slog.Default if nil. +func New(d Deps) *Core { + log := d.Logger + if log == nil { + log = slog.Default() + } + return &Core{ + cfg: d.Config, + provider: d.Provider, + ts: d.TS, + pf: d.PF, + probe: d.Probe, + store: d.Store, + log: log, + } +} diff --git a/internal/core/cost.go b/internal/core/cost.go new file mode 100644 index 0000000..23b8714 --- /dev/null +++ b/internal/core/cost.go @@ -0,0 +1,62 @@ +package core + +import ( + "context" + "fmt" + "time" +) + +// CostOpts controls EstimateCost. +type CostOpts struct { + // Period is the look-back window. If zero, defaults to time since CreatedAt. + Period time.Duration +} + +// CostResult is the estimate output. +type CostResult struct { + MachineType string + Hours float64 + USDPerHour float64 + USD float64 + Note string +} + +// machineHourlyUSD is a static price table for the small set of machine +// types we support. Values from GCP's public on-demand list price (US +// regions) as of v0.1; intentionally not the Billing API. +var machineHourlyUSD = map[string]float64{ + "e2-micro": 0.008, + "e2-small": 0.017, + "e2-medium": 0.034, + "n2-standard-2": 0.097, +} + +// EstimateCost returns a rough cost estimate for the active exit node. +func (c *Core) EstimateCost(ctx context.Context, opts CostOpts) (*CostResult, error) { + active, err := c.store.GetActive() + if err != nil { + return nil, fmt.Errorf("read state: %w", err) + } + if active == nil { + return nil, ErrNoActiveNode + } + rate, ok := machineHourlyUSD[active.MachineType] + if !ok { + return &CostResult{ + MachineType: active.MachineType, + Note: fmt.Sprintf("no static price for %q; configure manually", active.MachineType), + }, nil + } + period := opts.Period + if period == 0 { + period = time.Since(active.CreatedAt) + } + hours := period.Hours() + return &CostResult{ + MachineType: active.MachineType, + Hours: hours, + USDPerHour: rate, + USD: hours * rate, + Note: "list price, US regions, on-demand; ignores egress bandwidth and disk", + }, nil +} diff --git a/internal/core/cost_test.go b/internal/core/cost_test.go new file mode 100644 index 0000000..1a46462 --- /dev/null +++ b/internal/core/cost_test.go @@ -0,0 +1,76 @@ +package core + +import ( + "context" + "log/slog" + "testing" + "time" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/state" +) + +func costFixture(t *testing.T, active *gcp.ExitNode) *Core { + t.Helper() + statePath := t.TempDir() + "/state.json" + store, err := state.Open(statePath) + if err != nil { + t.Fatalf("state.Open: %v", err) + } + t.Cleanup(func() { _ = store.Close() }) + if active != nil { + _ = store.SetActive(active) + } + return New(Deps{ + Config: &config.Config{}, Provider: newMockProvider(), TS: newMockTS(), + PF: newMockPF(), Probe: &mockProbe{}, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) +} + +func TestEstimateCost_24h(t *testing.T) { + active := &gcp.ExitNode{ + Name: "v1", + MachineType: "e2-micro", + CreatedAt: time.Now().Add(-24 * time.Hour), + } + c := costFixture(t, active) + got, err := c.EstimateCost(context.Background(), CostOpts{Period: 24 * time.Hour}) + if err != nil { + t.Fatalf("EstimateCost: %v", err) + } + // e2-micro static rate is $0.008/hr (per the table in cost.go). + // 24h × $0.008 = $0.192. + wantMin, wantMax := 0.18, 0.21 + if got.USD < wantMin || got.USD > wantMax { + t.Errorf("USD = %.4f, want between %.2f and %.2f", got.USD, wantMin, wantMax) + } + if got.MachineType != "e2-micro" { + t.Errorf("MachineType = %q", got.MachineType) + } +} + +func TestEstimateCost_UnknownMachine(t *testing.T) { + active := &gcp.ExitNode{Name: "v1", MachineType: "fictional-1", CreatedAt: time.Now().Add(-1 * time.Hour)} + c := costFixture(t, active) + got, err := c.EstimateCost(context.Background(), CostOpts{Period: time.Hour}) + if err != nil { + t.Fatalf("EstimateCost: %v", err) + } + // Unknown machine: USD stays 0, Note explains. + if got.USD != 0 { + t.Errorf("USD = %.4f, want 0 for unknown machine", got.USD) + } + if got.Note == "" { + t.Errorf("Note should explain unknown machine type") + } +} + +func TestEstimateCost_NoActive(t *testing.T) { + c := costFixture(t, nil) + _, err := c.EstimateCost(context.Background(), CostOpts{Period: time.Hour}) + if err == nil { + t.Errorf("expected ErrNoActiveNode-like error") + } +} diff --git a/internal/core/down.go b/internal/core/down.go new file mode 100644 index 0000000..3c8464c --- /dev/null +++ b/internal/core/down.go @@ -0,0 +1,44 @@ +package core + +import ( + "context" + "errors" + "fmt" +) + +// ErrNoActiveNode signals that a command needing an active node found none. +var ErrNoActiveNode = errors.New("no active exit node") + +// DownOpts controls Down behavior. +type DownOpts struct { + Destroy bool // if true, remove the VM + Tailscale device; else just Stop +} + +// Down stops or destroys the currently active exit node. +func (c *Core) Down(ctx context.Context, opts DownOpts) error { + active, err := c.store.GetActive() + if err != nil { + return fmt.Errorf("read state: %w", err) + } + if active == nil { + return ErrNoActiveNode + } + if !opts.Destroy { + if err := c.provider.Stop(ctx, active.Name); err != nil { + return fmt.Errorf("stop %s: %w", active.Name, err) + } + return nil + } + if err := c.provider.Destroy(ctx, active.Name); err != nil { + return fmt.Errorf("destroy %s: %w", active.Name, err) + } + if active.DeviceID != "" { + if err := c.ts.DeleteDevice(ctx, active.DeviceID); err != nil { + c.log.Warn("delete device failed (best-effort)", "err", err, "device_id", active.DeviceID) + } + } + if err := c.store.ClearActive(); err != nil { + c.log.Warn("clear state failed", "err", err) + } + return nil +} diff --git a/internal/core/down_test.go b/internal/core/down_test.go new file mode 100644 index 0000000..fb2e04c --- /dev/null +++ b/internal/core/down_test.go @@ -0,0 +1,83 @@ +package core + +import ( + "context" + "errors" + "log/slog" + "testing" + "time" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/state" +) + +func downFixture(t *testing.T, active *gcp.ExitNode) *rotateFixture { + t.Helper() + statePath := t.TempDir() + "/state.json" + store, err := state.Open(statePath) + if err != nil { + t.Fatalf("state.Open: %v", err) + } + t.Cleanup(func() { _ = store.Close() }) + if active != nil { + if err := store.SetActive(active); err != nil { + t.Fatalf("seed: %v", err) + } + } + c := New(Deps{ + Config: &config.Config{}, + Provider: newMockProvider(), TS: newMockTS(), + PF: newMockPF(), Probe: &mockProbe{}, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) + return &rotateFixture{store: store, core: c, + prov: c.provider.(*mockProvider), ts: c.ts.(*mockTS), + pf: c.pf.(*mockPF), probe: c.probe.(*mockProbe)} +} + +func TestDown_StopOnly(t *testing.T) { + active := &gcp.ExitNode{Name: "vpn-1", DeviceID: "dev-1", State: gcp.StateRunning, CreatedAt: time.Now()} + f := downFixture(t, active) + if err := f.core.Down(context.Background(), DownOpts{Destroy: false}); err != nil { + t.Fatalf("Down: %v", err) + } + if !hasCallWithArg(f.prov.calls, "Stop", "vpn-1") { + t.Errorf("expected Stop(vpn-1); calls=%v", f.prov.calls) + } + if hasCallWithArg(f.prov.calls, "Destroy", "vpn-1") { + t.Errorf("Destroy should not be called when Destroy=false") + } + // State cache retained. + got, _ := f.store.GetActive() + if got == nil || got.Name != "vpn-1" { + t.Errorf("state cleared on Stop; got %v", got) + } +} + +func TestDown_Destroy(t *testing.T) { + active := &gcp.ExitNode{Name: "vpn-1", DeviceID: "dev-1", State: gcp.StateRunning, CreatedAt: time.Now()} + f := downFixture(t, active) + if err := f.core.Down(context.Background(), DownOpts{Destroy: true}); err != nil { + t.Fatalf("Down: %v", err) + } + if !hasCallWithArg(f.prov.calls, "Destroy", "vpn-1") { + t.Errorf("expected Destroy(vpn-1); calls=%v", f.prov.calls) + } + if !hasCallWithArg(f.ts.calls, "DeleteDevice", "dev-1") { + t.Errorf("expected DeleteDevice(dev-1); calls=%v", f.ts.calls) + } + // State cache cleared. + got, _ := f.store.GetActive() + if got != nil { + t.Errorf("state not cleared; got %v", got) + } +} + +func TestDown_NoActive(t *testing.T) { + f := downFixture(t, nil) + err := f.core.Down(context.Background(), DownOpts{}) + if !errors.Is(err, ErrNoActiveNode) { + t.Errorf("err = %v, want ErrNoActiveNode", err) + } +} diff --git a/internal/core/errors.go b/internal/core/errors.go new file mode 100644 index 0000000..f18ec0a --- /dev/null +++ b/internal/core/errors.go @@ -0,0 +1,21 @@ +package core + +import "fmt" + +// CriticalError signals an unrecoverable rotate failure where the pfSense +// revert itself failed. Callers MUST surface this loudly: both the old and +// new nodes are likely alive and pfSense's gateway state is ambiguous. +type CriticalError struct { + Message string + PrimaryErr error + RevertErr error + NewNodeName string + NewDeviceID string +} + +func (e *CriticalError) Error() string { + return fmt.Sprintf("CRITICAL: %s: primary_err=%v; revert_err=%v; new_node=%s; new_device=%s", + e.Message, e.PrimaryErr, e.RevertErr, e.NewNodeName, e.NewDeviceID) +} + +func (e *CriticalError) Unwrap() error { return e.PrimaryErr } diff --git a/internal/core/health.go b/internal/core/health.go new file mode 100644 index 0000000..38c7e02 --- /dev/null +++ b/internal/core/health.go @@ -0,0 +1,33 @@ +package core + +import ( + "context" + "fmt" +) + +// HealthResult is the result of a Health probe. +type HealthResult struct { + OK bool + EgressIP string // observed + ExpectedIP string // GCP public IP of the active node + ProbeErr error // non-nil if probe itself errored +} + +// Health runs the pre-cutover probe against the currently active node +// without mutating anything else. +func (c *Core) Health(ctx context.Context) (*HealthResult, error) { + active, err := c.store.GetActive() + if err != nil { + return nil, fmt.Errorf("read state: %w", err) + } + if active == nil { + return nil, ErrNoActiveNode + } + egress, perr := c.probe.EgressVia(ctx, active.TailscaleIP) + return &HealthResult{ + OK: perr == nil && egress == active.PublicIP, + EgressIP: egress, + ExpectedIP: active.PublicIP, + ProbeErr: perr, + }, nil +} diff --git a/internal/core/health_test.go b/internal/core/health_test.go new file mode 100644 index 0000000..4b415bf --- /dev/null +++ b/internal/core/health_test.go @@ -0,0 +1,73 @@ +package core + +import ( + "context" + "errors" + "log/slog" + "testing" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/state" +) + +func healthFixture(t *testing.T, active *gcp.ExitNode, probeIP string, probeErr error) *Core { + t.Helper() + statePath := t.TempDir() + "/state.json" + store, err := state.Open(statePath) + if err != nil { + t.Fatalf("state.Open: %v", err) + } + t.Cleanup(func() { _ = store.Close() }) + if active != nil { + _ = store.SetActive(active) + } + prov := newMockProvider() + if active != nil { + prov.GetResult[active.Name] = active + } + probe := &mockProbe{EgressViaResult: probeIP, EgressViaErr: probeErr} + return New(Deps{ + Config: &config.Config{Behavior: config.BehaviorConfig{ProbeURL: "https://x/ip"}}, + Provider: prov, TS: newMockTS(), PF: newMockPF(), Probe: probe, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) +} + +func TestHealth_OK(t *testing.T) { + active := &gcp.ExitNode{Name: "v1", PublicIP: "1.2.3.4", TailscaleIP: "100.64.0.1"} + c := healthFixture(t, active, "1.2.3.4", nil) + got, err := c.Health(context.Background()) + if err != nil { + t.Fatalf("Health: %v", err) + } + if !got.OK { + t.Errorf("OK = false, want true; got=%+v", got) + } + if got.EgressIP != "1.2.3.4" { + t.Errorf("EgressIP = %q", got.EgressIP) + } +} + +func TestHealth_Mismatch(t *testing.T) { + active := &gcp.ExitNode{Name: "v1", PublicIP: "1.2.3.4", TailscaleIP: "100.64.0.1"} + c := healthFixture(t, active, "5.6.7.8", nil) + got, err := c.Health(context.Background()) + if err != nil { + t.Fatalf("Health: %v", err) + } + if got.OK { + t.Errorf("OK = true, want false") + } + if got.EgressIP != "5.6.7.8" || got.ExpectedIP != "1.2.3.4" { + t.Errorf("got %+v", got) + } +} + +func TestHealth_NoActive(t *testing.T) { + c := healthFixture(t, nil, "", nil) + _, err := c.Health(context.Background()) + if !errors.Is(err, ErrNoActiveNode) { + t.Errorf("err = %v, want ErrNoActiveNode", err) + } +} diff --git a/internal/core/list.go b/internal/core/list.go new file mode 100644 index 0000000..2b3626b --- /dev/null +++ b/internal/core/list.go @@ -0,0 +1,17 @@ +package core + +import ( + "context" + "fmt" + + "github.com/iker/exit-node/internal/gcp" +) + +// List returns all managed exit nodes. +func (c *Core) List(ctx context.Context) ([]*gcp.ExitNode, error) { + nodes, err := c.provider.List(ctx) + if err != nil { + return nil, fmt.Errorf("list: %w", err) + } + return nodes, nil +} diff --git a/internal/core/list_test.go b/internal/core/list_test.go new file mode 100644 index 0000000..15590dc --- /dev/null +++ b/internal/core/list_test.go @@ -0,0 +1,37 @@ +package core + +import ( + "context" + "log/slog" + "testing" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/state" +) + +func TestList(t *testing.T) { + statePath := t.TempDir() + "/state.json" + store, err := state.Open(statePath) + if err != nil { + t.Fatalf("state.Open: %v", err) + } + defer store.Close() + prov := newMockProvider() + prov.ListResult = []*gcp.ExitNode{ + {Name: "a", State: gcp.StateRunning}, + {Name: "b", State: gcp.StateStopped}, + } + c := New(Deps{ + Config: &config.Config{}, Provider: prov, TS: newMockTS(), + PF: newMockPF(), Probe: &mockProbe{}, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) + got, err := c.List(context.Background()) + if err != nil { + t.Fatalf("List: %v", err) + } + if len(got) != 2 || got[0].Name != "a" || got[1].Name != "b" { + t.Errorf("got %v", got) + } +} diff --git a/internal/core/mocks_test.go b/internal/core/mocks_test.go new file mode 100644 index 0000000..1bf77ff --- /dev/null +++ b/internal/core/mocks_test.go @@ -0,0 +1,239 @@ +package core + +import ( + "context" + "errors" + "sync" + "time" + + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/pfsense" + "github.com/iker/exit-node/internal/tailscale" +) + +// clock issues monotonically-increasing sequence numbers shared across all +// mocks in a fixture, so the test can reconstruct the chronological order +// of cross-mock calls (e.g. ts.Mint → prov.Provision → ts.WaitForDevice). +type clock struct { + mu sync.Mutex + seq int +} + +func (c *clock) tick() int { + c.mu.Lock() + defer c.mu.Unlock() + c.seq++ + return c.seq +} + +// callRecord captures the name, args, and chronological sequence of a mock +// invocation. +type callRecord struct { + Seq int + Name string + Args []any +} + +type recorder struct { + mu sync.Mutex + clock *clock // shared across mocks in the same fixture + calls []callRecord +} + +func (r *recorder) record(name string, args ...any) { + seq := 0 + if r.clock != nil { + seq = r.clock.tick() + } + r.mu.Lock() + defer r.mu.Unlock() + r.calls = append(r.calls, callRecord{Seq: seq, Name: name, Args: args}) +} + +func (r *recorder) names() []string { + r.mu.Lock() + defer r.mu.Unlock() + out := make([]string, len(r.calls)) + for i, c := range r.calls { + out[i] = c.Name + } + return out +} + +// --- Provider mock ---------------------------------------------------------- + +type mockProvider struct { + recorder + ProvisionResult *gcp.ExitNode + ProvisionErr error + StartErr error + StopErr error + DestroyErr map[string]error // keyed by name + ListResult []*gcp.ExitNode + ListErr error + GetResult map[string]*gcp.ExitNode + GetErr error +} + +func newMockProvider() *mockProvider { + return &mockProvider{ + DestroyErr: map[string]error{}, + GetResult: map[string]*gcp.ExitNode{}, + } +} + +// attachClock wires a shared sequence clock into the mock's recorder so its +// calls can be merged chronologically with other mocks in the fixture. +func (m *mockProvider) attachClock(c *clock) { m.clock = c } + +func (m *mockProvider) Provision(ctx context.Context, opts gcp.ProvisionOpts) (*gcp.ExitNode, error) { + m.record("Provision", opts.Name, opts.Region, opts.MachineType) + if m.ProvisionErr != nil { + return nil, m.ProvisionErr + } + return m.ProvisionResult, nil +} +func (m *mockProvider) Start(ctx context.Context, name string) error { + m.record("Start", name) + return m.StartErr +} +func (m *mockProvider) Stop(ctx context.Context, name string) error { + m.record("Stop", name) + return m.StopErr +} +func (m *mockProvider) Destroy(ctx context.Context, name string) error { + m.record("Destroy", name) + return m.DestroyErr[name] +} +func (m *mockProvider) List(ctx context.Context) ([]*gcp.ExitNode, error) { + m.record("List") + return m.ListResult, m.ListErr +} +func (m *mockProvider) Get(ctx context.Context, name string) (*gcp.ExitNode, error) { + m.record("Get", name) + if m.GetErr != nil { + return nil, m.GetErr + } + return m.GetResult[name], nil +} + +// --- TailscaleClient mock --------------------------------------------------- + +type mockTS struct { + recorder + MintKey string + MintErr error + WaitDevice *tailscale.Device + WaitErr error + AuthorizeErr error + SetTagsErr error + DeleteDeviceErr map[string]error // keyed by device id + BlockMintUntilSeen bool // if true, returns context.Canceled if ctx cancels +} + +func newMockTS() *mockTS { + return &mockTS{ + DeleteDeviceErr: map[string]error{}, + MintKey: "tskey-ephemeral", + } +} + +func (m *mockTS) attachClock(c *clock) { m.clock = c } + +func (m *mockTS) MintEphemeralAuthKey(ctx context.Context, tags []string) (string, error) { + m.record("MintEphemeralAuthKey", tags) + if m.MintErr != nil { + return "", m.MintErr + } + return m.MintKey, nil +} +func (m *mockTS) WaitForDevice(ctx context.Context, hostname string, timeout time.Duration) (*tailscale.Device, error) { + m.record("WaitForDevice", hostname, timeout) + if m.WaitErr != nil { + return nil, m.WaitErr + } + return m.WaitDevice, nil +} +func (m *mockTS) AuthorizeExitNode(ctx context.Context, deviceID string) error { + m.record("AuthorizeExitNode", deviceID) + return m.AuthorizeErr +} +func (m *mockTS) SetTags(ctx context.Context, deviceID string, tags []string) error { + m.record("SetTags", deviceID, tags) + return m.SetTagsErr +} +func (m *mockTS) DeleteDevice(ctx context.Context, deviceID string) error { + m.record("DeleteDevice", deviceID) + return m.DeleteDeviceErr[deviceID] +} + +// --- PFSenseClient mock ----------------------------------------------------- + +type mockPF struct { + recorder + Gateways map[string]string // name → IP + GetErr error + UpdateErr map[string]error // keyed by IP being set; matched on the new IP arg + UpdateErrFirstCall error // if non-nil, fails on first call only (for revert tests) + ApplyErr []error // pop per call (1st call uses [0], 2nd [1]) + applyIdx int +} + +func newMockPF() *mockPF { + return &mockPF{ + Gateways: map[string]string{}, + UpdateErr: map[string]error{}, + } +} + +func (m *mockPF) attachClock(c *clock) { m.clock = c } + +func (m *mockPF) GetGateway(ctx context.Context, name string) (*pfsense.Gateway, error) { + m.record("GetGateway", name) + if m.GetErr != nil { + return nil, m.GetErr + } + ip, ok := m.Gateways[name] + if !ok { + return nil, errors.New("gateway not found") + } + return &pfsense.Gateway{Name: name, IP: ip}, nil +} +func (m *mockPF) UpdateGatewayIP(ctx context.Context, name, ip string) error { + m.record("UpdateGatewayIP", name, ip) + if err, ok := m.UpdateErr[ip]; ok { + return err + } + m.Gateways[name] = ip + return nil +} +func (m *mockPF) Apply(ctx context.Context) error { + m.record("Apply") + i := m.applyIdx + m.applyIdx++ + if i < len(m.ApplyErr) { + return m.ApplyErr[i] + } + return nil +} + +// --- Probe mock ------------------------------------------------------------- + +type mockProbe struct { + recorder + EgressViaResult string + EgressViaErr error + EgressDirectResult string + EgressDirectErr error +} + +func (m *mockProbe) EgressVia(ctx context.Context, tailscaleIP string) (string, error) { + m.record("EgressVia", tailscaleIP) + return m.EgressViaResult, m.EgressViaErr +} +func (m *mockProbe) EgressDirect(ctx context.Context) (string, error) { + m.record("EgressDirect") + return m.EgressDirectResult, m.EgressDirectErr +} + +func (m *mockProbe) attachClock(c *clock) { m.clock = c } diff --git a/internal/core/named.go b/internal/core/named.go new file mode 100644 index 0000000..6182d04 --- /dev/null +++ b/internal/core/named.go @@ -0,0 +1,114 @@ +package core + +import ( + "context" + "errors" + "fmt" + "time" + + "github.com/iker/exit-node/internal/gcp" +) + +// deviceLookupTimeout is the maximum time Destroy will wait for a Tailscale +// device to appear before giving up and proceeding with VM destruction. +const deviceLookupTimeout = 5 * time.Second + +// ErrNameRequired is returned by Start when name is the empty string. +var ErrNameRequired = errors.New("core: name required") + +// GetActive returns the currently-active exit node from the local state cache, +// or nil if none is recorded. +func (c *Core) GetActive() (*gcp.ExitNode, error) { + return c.store.GetActive() +} + +// Start calls the provider's Start method for the named exit node and then +// refreshes the local state cache if that node is currently the active one. +func (c *Core) Start(ctx context.Context, name string) error { + if name == "" { + return ErrNameRequired + } + if err := c.provider.Start(ctx, name); err != nil { + return fmt.Errorf("provider.Start %s: %w", name, err) + } + return c.refreshIfActive(ctx, name) +} + +// Stop stops a running exit-node VM by name. If the name matches the +// currently-active node, the on-disk state cache is refreshed. +func (c *Core) Stop(ctx context.Context, name string) error { + if name == "" { + return ErrNameRequired + } + if err := c.provider.Stop(ctx, name); err != nil { + return fmt.Errorf("provider.Stop %s: %w", name, err) + } + return c.refreshIfActive(ctx, name) +} + +// Destroy removes a named exit node: first it tries to look up and delete the +// Tailscale device, then it destroys the VM. If the VM destroy fails the error +// is returned. If the destroyed node was the active node, the state cache is +// cleared. +func (c *Core) Destroy(ctx context.Context, name string) error { + if name == "" { + return ErrNameRequired + } + + // Step 1: Attempt to remove the Tailscale device. A short timeout is used + // so that a missing or already-deleted device does not block VM cleanup. + dev, err := c.ts.WaitForDevice(ctx, name, deviceLookupTimeout) + if err != nil { + c.log.Warn("Destroy: could not look up TS device, skipping device delete", "name", name, "err", err) + } else if dev != nil { + if delErr := c.ts.DeleteDevice(ctx, dev.ID); delErr != nil { + c.log.Warn("Destroy: ts.DeleteDevice failed, proceeding with VM destroy", "name", name, "deviceID", dev.ID, "err", delErr) + } + } + + // Step 2: Destroy the VM — load-bearing; failure aborts the operation. + if err := c.provider.Destroy(ctx, name); err != nil { + return fmt.Errorf("provider.Destroy %s: %w", name, err) + } + + // Step 3: Clear state cache if this was the active node. + active, err := c.store.GetActive() + if err != nil { + c.log.Warn("Destroy: could not read active state", "err", err) + return nil + } + if active != nil && active.Name == name { + if err := c.store.ClearActive(); err != nil { + return fmt.Errorf("clear state after destroy: %w", err) + } + } + return nil +} + +// refreshIfActive re-fetches the named node from the provider and updates the +// local state cache — but only when name matches the currently-recorded active +// node. A provider Get failure is logged and swallowed; Start already succeeded +// so a state-refresh hiccup must not surface as a Start failure. +func (c *Core) refreshIfActive(ctx context.Context, name string) error { + active, err := c.store.GetActive() + if err != nil { + c.log.Warn("refreshIfActive: could not read active state", "err", err) + return nil + } + if active == nil || active.Name != name { + return nil + } + fresh, err := c.provider.Get(ctx, name) + if err != nil { + c.log.Warn("refreshIfActive: provider.Get failed, skipping state update", "name", name, "err", err) + return nil + } + if fresh == nil { + c.log.Warn("refreshIfActive: provider.Get returned nil, skipping state update", "name", name) + return nil + } + if err := c.store.SetActive(fresh); err != nil { + c.log.Warn("refreshIfActive: SetActive failed", "name", name, "err", err) + } + return nil +} diff --git a/internal/core/named_test.go b/internal/core/named_test.go new file mode 100644 index 0000000..3453bb1 --- /dev/null +++ b/internal/core/named_test.go @@ -0,0 +1,232 @@ +package core + +import ( + "context" + "errors" + "log/slog" + "testing" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/state" + "github.com/iker/exit-node/internal/tailscale" +) + +type namedFixtureT struct { + c *Core + store *state.Store + prov *mockProvider + ts *mockTS +} + +func namedFixture(t *testing.T, active *gcp.ExitNode) *namedFixtureT { + t.Helper() + statePath := t.TempDir() + "/state.json" + store, err := state.Open(statePath) + if err != nil { + t.Fatalf("state.Open: %v", err) + } + t.Cleanup(func() { _ = store.Close() }) + if active != nil { + if err := store.SetActive(active); err != nil { + t.Fatalf("SetActive: %v", err) + } + } + cfg := &config.Config{} + prov := newMockProvider() + ts := newMockTS() + pf := newMockPF() + probe := &mockProbe{} + c := New(Deps{ + Config: cfg, Provider: prov, TS: ts, PF: pf, Probe: probe, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) + return &namedFixtureT{c: c, store: store, prov: prov, ts: ts} +} + +func TestStart_CallsProviderStart(t *testing.T) { + f := namedFixture(t, nil) + + if err := f.c.Start(context.Background(), "vpn-us-central1-abc"); err != nil { + t.Fatalf("Start: %v", err) + } + if !hasCallWithArg(f.prov.calls, "Start", "vpn-us-central1-abc") { + t.Errorf("provider.Start not called with expected name; calls=%v", f.prov.calls) + } +} + +func TestStart_RefreshesStateWhenNameMatchesActive(t *testing.T) { + active := &gcp.ExitNode{Name: "vpn-us-central1-abc", State: gcp.StateStopped} + f := namedFixture(t, active) + f.prov.GetResult["vpn-us-central1-abc"] = &gcp.ExitNode{ + Name: "vpn-us-central1-abc", State: gcp.StateRunning, PublicIP: "1.2.3.4", + } + + if err := f.c.Start(context.Background(), "vpn-us-central1-abc"); err != nil { + t.Fatalf("Start: %v", err) + } + got, err := f.store.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got == nil { + t.Fatal("GetActive returned nil, want refreshed node") + } + if got.State != gcp.StateRunning || got.PublicIP != "1.2.3.4" { + t.Errorf("state not refreshed: got State=%v PublicIP=%q", got.State, got.PublicIP) + } +} + +func TestStart_DoesNotTouchStateWhenNameMismatch(t *testing.T) { + active := &gcp.ExitNode{Name: "vpn-us-central1-abc", State: gcp.StateRunning, PublicIP: "9.9.9.9"} + f := namedFixture(t, active) + // Provider Get for the different name returns nothing (default empty map). + + if err := f.c.Start(context.Background(), "vpn-eu-west1-xyz"); err != nil { + t.Fatalf("Start: %v", err) + } + got, err := f.store.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got == nil || got.PublicIP != "9.9.9.9" { + t.Errorf("state mutated unexpectedly: %+v", got) + } +} + +func TestStart_RejectsEmptyName(t *testing.T) { + f := namedFixture(t, nil) + err := f.c.Start(context.Background(), "") + if !errors.Is(err, ErrNameRequired) { + t.Errorf("got %v, want ErrNameRequired", err) + } + // Provider.Start must not have been called. + if hasCallWithArg(f.prov.calls, "Start", "") { + t.Errorf("provider.Start was called despite empty name") + } +} + +func TestStop_CallsProviderStop(t *testing.T) { + f := namedFixture(t, nil) + + if err := f.c.Stop(context.Background(), "vpn-us-central1-abc"); err != nil { + t.Fatalf("Stop: %v", err) + } + if !hasCallWithArg(f.prov.calls, "Stop", "vpn-us-central1-abc") { + t.Errorf("provider.Stop not called with expected name; calls=%v", f.prov.calls) + } +} + +func TestStop_RefreshesStateWhenNameMatchesActive(t *testing.T) { + active := &gcp.ExitNode{Name: "vpn-us-central1-abc", State: gcp.StateRunning} + f := namedFixture(t, active) + f.prov.GetResult["vpn-us-central1-abc"] = &gcp.ExitNode{ + Name: "vpn-us-central1-abc", State: gcp.StateStopped, PublicIP: "", + } + + if err := f.c.Stop(context.Background(), "vpn-us-central1-abc"); err != nil { + t.Fatalf("Stop: %v", err) + } + got, err := f.store.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got == nil { + t.Fatal("GetActive returned nil, want refreshed node") + } + if got.State != gcp.StateStopped { + t.Errorf("state not refreshed: got State=%v, want StateStopped", got.State) + } +} + +func TestStop_RejectsEmptyName(t *testing.T) { + f := namedFixture(t, nil) + err := f.c.Stop(context.Background(), "") + if !errors.Is(err, ErrNameRequired) { + t.Errorf("got %v, want ErrNameRequired", err) + } + // Provider.Stop must not have been called. + if hasCallWithArg(f.prov.calls, "Stop", "") { + t.Errorf("provider.Stop was called despite empty name") + } +} + +// --------------------------------------------------------------------------- +// Destroy tests +// --------------------------------------------------------------------------- + +func TestDestroy_HappyPath_DestroysVMAndDevice(t *testing.T) { + f := namedFixture(t, nil) + f.ts.WaitDevice = &tailscale.Device{ID: "device-1", Hostname: "vpn-us-central1-abc"} + + if err := f.c.Destroy(context.Background(), "vpn-us-central1-abc"); err != nil { + t.Fatalf("Destroy: %v", err) + } + if !hasCallWithArg(f.prov.calls, "Destroy", "vpn-us-central1-abc") { + t.Errorf("provider.Destroy not called with expected name; calls=%v", f.prov.calls) + } + if !hasCallWithArg(f.ts.calls, "DeleteDevice", "device-1") { + t.Errorf("ts.DeleteDevice not called with expected device ID; calls=%v", f.ts.calls) + } +} + +func TestDestroy_ClearsStateWhenNameMatchesActive(t *testing.T) { + active := &gcp.ExitNode{Name: "vpn-us-central1-abc", State: gcp.StateRunning} + f := namedFixture(t, active) + f.ts.WaitDevice = &tailscale.Device{ID: "device-1", Hostname: "vpn-us-central1-abc"} + + if err := f.c.Destroy(context.Background(), "vpn-us-central1-abc"); err != nil { + t.Fatalf("Destroy: %v", err) + } + got, err := f.store.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got != nil { + t.Errorf("state not cleared after destroy: %+v", got) + } +} + +func TestDestroy_LeavesStateAloneWhenNameMismatch(t *testing.T) { + active := &gcp.ExitNode{Name: "vpn-eu-west1-xyz", State: gcp.StateRunning, PublicIP: "9.9.9.9"} + f := namedFixture(t, active) + f.ts.WaitDevice = &tailscale.Device{ID: "device-1", Hostname: "vpn-us-central1-abc"} + + if err := f.c.Destroy(context.Background(), "vpn-us-central1-abc"); err != nil { + t.Fatalf("Destroy: %v", err) + } + got, err := f.store.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got == nil || got.Name != "vpn-eu-west1-xyz" { + t.Errorf("active state mutated unexpectedly: %+v", got) + } +} + +func TestDestroy_DeviceLookupFails_ProceedsWithVMDestroy(t *testing.T) { + f := namedFixture(t, nil) + f.ts.WaitErr = errors.New("device not found") + // WaitDevice is nil — mockTS returns (nil, WaitErr) when WaitErr is set. + + if err := f.c.Destroy(context.Background(), "vpn-us-central1-abc"); err != nil { + t.Fatalf("Destroy: %v", err) + } + if !hasCallWithArg(f.prov.calls, "Destroy", "vpn-us-central1-abc") { + t.Errorf("provider.Destroy not called with expected name; calls=%v", f.prov.calls) + } + if hasCallWithArg(f.ts.calls, "DeleteDevice", "device-1") { + t.Errorf("ts.DeleteDevice must not be called when device lookup failed; calls=%v", f.ts.calls) + } +} + +func TestDestroy_RejectsEmptyName(t *testing.T) { + f := namedFixture(t, nil) + err := f.c.Destroy(context.Background(), "") + if !errors.Is(err, ErrNameRequired) { + t.Errorf("got %v, want ErrNameRequired", err) + } + if hasCallWithArg(f.prov.calls, "Destroy", "") { + t.Errorf("provider.Destroy must not be called for empty name") + } +} diff --git a/internal/core/rotate.go b/internal/core/rotate.go new file mode 100644 index 0000000..7bc8d62 --- /dev/null +++ b/internal/core/rotate.go @@ -0,0 +1,203 @@ +package core + +import ( + "context" + "crypto/rand" + "encoding/hex" + "fmt" + "time" + + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/pfsense" + "github.com/iker/exit-node/internal/tailscale" +) + +// RotateOpts controls a single rotate invocation. +type RotateOpts struct { + Region string // empty → cfg.GCP.DefaultRegion + MachineType string // empty → cfg.GCP.DefaultMachineType +} + +// RotateResult captures both the destroyed and provisioned nodes. +type RotateResult struct { + Old *gcp.ExitNode + New *gcp.ExitNode +} + +// Rotate provisions a new exit node, verifies it, optionally cuts pfSense +// over, then tears down the old one. See spec §6 for the rollback rules. +func (c *Core) Rotate(ctx context.Context, opts RotateOpts) (*RotateResult, error) { + region := opts.Region + if region == "" { + region = c.cfg.GCP.DefaultRegion + } + machine := opts.MachineType + if machine == "" { + machine = c.cfg.GCP.DefaultMachineType + } + + // 1. Snapshot current state. + old, err := c.store.GetActive() + if err != nil { + return nil, fmt.Errorf("read state: %w", err) + } + + // 2. Mint ephemeral auth key. + authKey, err := c.ts.MintEphemeralAuthKey(ctx, c.cfg.Tailscale.Tags) + if err != nil { + return nil, fmt.Errorf("mint ephemeral auth key: %w", err) + } + + // 3. Provision new VM. + name := genName(region) + newNode, err := c.provider.Provision(ctx, gcp.ProvisionOpts{ + Name: name, + Region: region, + Zone: c.cfg.GCP.DefaultZone, + MachineType: machine, + Hostname: name, + TailscaleAuthKey: authKey, + Tags: c.cfg.Tailscale.Tags, + InstallScriptURL: c.cfg.Behavior.InstallScriptURL, + DiskSizeGB: c.cfg.GCP.DiskSizeGB, + Network: c.cfg.GCP.Network, + }) + if err != nil { + return nil, fmt.Errorf("provision new node: %w", err) + } + + // From here on, newNode exists in GCP. Track cleanup. + var newDevice *tailscale.Device + cleanup := func(reason error) { + c.log.Warn("rotate failed, tearing down new node", + "reason", reason, "name", newNode.Name) + cctx, cancel := context.WithTimeout(context.Background(), 30*time.Second) + defer cancel() + if newDevice != nil { + if dErr := c.ts.DeleteDevice(cctx, newDevice.ID); dErr != nil { + c.log.Error("cleanup DeleteDevice failed", "err", dErr) + } + } + if dErr := c.provider.Destroy(cctx, newNode.Name); dErr != nil { + c.log.Error("cleanup Destroy failed", "err", dErr) + } + } + + // 4. Wait for Tailscale registration. + newDevice, err = c.ts.WaitForDevice(ctx, newNode.Name, c.cfg.Behavior.RegistrationTimeout) + if err != nil { + cleanup(fmt.Errorf("device never registered: %w", err)) + return nil, fmt.Errorf("wait for device: %w", err) + } + + // 5. Authorize as exit node. + if err := c.ts.AuthorizeExitNode(ctx, newDevice.ID); err != nil { + cleanup(fmt.Errorf("authorize as exit node: %w", err)) + return nil, fmt.Errorf("authorize exit node: %w", err) + } + + // 6. Set tags. + if err := c.ts.SetTags(ctx, newDevice.ID, c.cfg.Tailscale.Tags); err != nil { + cleanup(fmt.Errorf("set tags: %w", err)) + return nil, fmt.Errorf("set tags: %w", err) + } + + newNode.TailscaleIP = newDevice.TailscaleIP + newNode.DeviceID = newDevice.ID + + // 7. Pre-cutover probe. + if c.cfg.Behavior.VerifyPreCutover { + egress, err := c.probe.EgressVia(ctx, newDevice.TailscaleIP) + if err != nil { + cleanup(fmt.Errorf("probe failed: %w", err)) + return nil, fmt.Errorf("pre-cutover probe: %w", err) + } + if egress != newNode.PublicIP { + cleanup(fmt.Errorf("egress mismatch: probe=%s vm=%s", egress, newNode.PublicIP)) + return nil, fmt.Errorf("egress IP mismatch: got %s, want %s", egress, newNode.PublicIP) + } + } + + // Snapshot the current pfSense gateway for revert. + var oldGw *pfsense.Gateway + if c.cfg.Behavior.AutoSyncPFSense { + oldGw, err = c.pf.GetGateway(ctx, c.cfg.PFSense.GatewayName) + if err != nil { + cleanup(fmt.Errorf("snapshot pfSense gateway: %w", err)) + return nil, fmt.Errorf("snapshot pfsense gateway: %w", err) + } + + // 8. POINT OF NO RETURN: update + apply. + if err := c.pf.UpdateGatewayIP(ctx, c.cfg.PFSense.GatewayName, newDevice.TailscaleIP); err != nil { + // UpdateGatewayIP failed before any Apply — live config unchanged. + // Defensive: still try a revert call in case the impl staged partial config. + rctx, rcancel := context.WithTimeout(context.Background(), 30*time.Second) + defer rcancel() + _ = c.pf.UpdateGatewayIP(rctx, c.cfg.PFSense.GatewayName, oldGw.IP) + cleanup(fmt.Errorf("pfsense update gateway failed: %w", err)) + return nil, fmt.Errorf("update pfsense gateway: %w", err) + } + if err := c.pf.Apply(ctx); err != nil { + // Apply failed: a stale stage might still exist. Revert. + rctx, rcancel := context.WithTimeout(context.Background(), 30*time.Second) + defer rcancel() + revertErr := c.pf.UpdateGatewayIP(rctx, c.cfg.PFSense.GatewayName, oldGw.IP) + if revertErr == nil { + revertErr = c.pf.Apply(rctx) + } + if revertErr != nil { + return nil, &CriticalError{ + Message: "pfsense apply failed AND revert failed", + PrimaryErr: err, + RevertErr: revertErr, + NewNodeName: newNode.Name, + NewDeviceID: newDevice.ID, + } + } + cleanup(fmt.Errorf("pfsense apply failed (reverted): %w", err)) + return nil, fmt.Errorf("apply pfsense changes: %w", err) + } + + // 9. (Optional) post-cutover probe. + if c.cfg.Behavior.VerifyPostCutover { + egress, perr := c.probe.EgressDirect(ctx) + if perr != nil || egress != newNode.PublicIP { + rctx, rcancel := context.WithTimeout(context.Background(), 30*time.Second) + defer rcancel() + _ = c.pf.UpdateGatewayIP(rctx, c.cfg.PFSense.GatewayName, oldGw.IP) + _ = c.pf.Apply(rctx) + cleanup(fmt.Errorf("post-cutover probe failed: egress=%s err=%v", egress, perr)) + return nil, fmt.Errorf("post-cutover probe: got %s, want %s (err=%v)", egress, newNode.PublicIP, perr) + } + } + } + + // Tear down old node (best-effort). + if old != nil { + if err := c.provider.Destroy(ctx, old.Name); err != nil { + c.log.Error("teardown old VM failed (best-effort)", + "err", err, "name", old.Name) + } + if old.DeviceID != "" { + if err := c.ts.DeleteDevice(ctx, old.DeviceID); err != nil { + c.log.Error("teardown old device failed (best-effort)", + "err", err, "device_id", old.DeviceID) + } + } + } + + // Update state cache. + if err := c.store.SetActive(newNode); err != nil { + c.log.Warn("failed to update state cache; will reconcile next run", + "err", err) + } + + return &RotateResult{Old: old, New: newNode}, nil +} + +// genName returns a name in the convention vpn--<6-hex>. +func genName(region string) string { + var b [3]byte + _, _ = rand.Read(b[:]) + return fmt.Sprintf("vpn-%s-%s", region, hex.EncodeToString(b[:])) +} diff --git a/internal/core/rotate_test.go b/internal/core/rotate_test.go new file mode 100644 index 0000000..59c9906 --- /dev/null +++ b/internal/core/rotate_test.go @@ -0,0 +1,495 @@ +package core + +import ( + "context" + "errors" + "log/slog" + "reflect" + "sort" + "testing" + "time" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/state" + "github.com/iker/exit-node/internal/tailscale" +) + +// rotateFixture wires a Core with all mocks pre-populated for a happy +// rotate (no pfSense sync by default; tests override per case). +type rotateFixture struct { + cfg *config.Config + prov *mockProvider + ts *mockTS + pf *mockPF + probe *mockProbe + store *state.Store + core *Core + clock *clock + + oldNode *gcp.ExitNode + newNode *gcp.ExitNode + newDev *tailscale.Device +} + +// orderedNames returns the names of every recorded call across all mocks +// in chronological order (using the shared sequence clock). +func (f *rotateFixture) orderedNames() []string { + all := append([]callRecord{}, f.ts.calls...) + all = append(all, f.prov.calls...) + all = append(all, f.pf.calls...) + all = append(all, f.probe.calls...) + sort.Slice(all, func(i, j int) bool { return all[i].Seq < all[j].Seq }) + out := make([]string, len(all)) + for i, c := range all { + out[i] = c.Name + } + return out +} + +func newRotateFixture(t *testing.T) *rotateFixture { + t.Helper() + statePath := t.TempDir() + "/state.json" + store, err := state.Open(statePath) + if err != nil { + t.Fatalf("state.Open: %v", err) + } + t.Cleanup(func() { _ = store.Close() }) + + old := &gcp.ExitNode{ + Name: "vpn-old", Region: "us-west1", Zone: "us-west1-a", + MachineType: "e2-micro", PublicIP: "35.0.0.1", TailscaleIP: "100.64.0.1", + DeviceID: "dev-old", State: gcp.StateRunning, + CreatedAt: time.Date(2026, 5, 1, 0, 0, 0, 0, time.UTC), + } + if err := store.SetActive(old); err != nil { + t.Fatalf("seed: %v", err) + } + + newN := &gcp.ExitNode{ + Name: "vpn-new", Region: "asia-southeast1", Zone: "asia-southeast1-a", + MachineType: "e2-micro", PublicIP: "35.9.9.9", + State: gcp.StateRunning, CreatedAt: time.Now(), + } + dev := &tailscale.Device{ID: "dev-new", Hostname: "vpn-new", TailscaleIP: "100.64.0.9", Online: true} + + cfg := &config.Config{ + GCP: config.GCPConfig{ + Project: "p", DefaultRegion: "us-west1", DefaultMachineType: "e2-micro", + Network: "default", DiskSizeGB: 10, + }, + Tailscale: config.TailscaleConfig{Tailnet: "x.com", Tags: []string{"tag:exit-node"}, EphemeralKeyTTL: 5 * time.Minute}, + PFSense: config.PFSenseConfig{GatewayName: "GW"}, + Behavior: config.BehaviorConfig{ + AutoSyncPFSense: false, // happy path without pfSense + VerifyPreCutover: true, + VerifyPostCutover: false, + ProbeURL: "https://example.com/ip", + RegistrationTimeout: 90 * time.Second, + InstallScriptURL: "https://example.com/install.sh", + }, + } + + clk := &clock{} + + prov := newMockProvider() + prov.ProvisionResult = newN + prov.GetResult[old.Name] = old + prov.attachClock(clk) + + ts := newMockTS() + ts.WaitDevice = dev + ts.attachClock(clk) + + pf := newMockPF() + pf.Gateways["GW"] = "100.64.0.1" + pf.attachClock(clk) + + probe := &mockProbe{EgressViaResult: newN.PublicIP} + probe.attachClock(clk) + + c := New(Deps{ + Config: cfg, Provider: prov, TS: ts, PF: pf, Probe: probe, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) + + return &rotateFixture{ + cfg: cfg, prov: prov, ts: ts, pf: pf, probe: probe, + store: store, core: c, clock: clk, + oldNode: old, newNode: newN, newDev: dev, + } +} + +// testWriter forwards slog output to t.Logf so tests stay readable. +type testWriter struct{ t *testing.T } + +func (w testWriter) Write(p []byte) (int, error) { w.t.Logf("%s", p); return len(p), nil } + +func TestRotateHappyPath_NoPFSense(t *testing.T) { + f := newRotateFixture(t) + res, err := f.core.Rotate(context.Background(), RotateOpts{Region: "asia-southeast1"}) + if err != nil { + t.Fatalf("Rotate err = %v", err) + } + if res.New == nil || res.New.Name != f.newNode.Name { + t.Errorf("res.New.Name = %v, want %s", res.New, f.newNode.Name) + } + if res.Old == nil || res.Old.Name != f.oldNode.Name { + t.Errorf("res.Old.Name = %v, want %s", res.Old, f.oldNode.Name) + } + + wantCalls := []string{ + "MintEphemeralAuthKey", + "Provision", + "WaitForDevice", + "AuthorizeExitNode", + "SetTags", + "EgressVia", + } + if !reflect.DeepEqual(f.ts.names()[:1], wantCalls[:1]) { + t.Errorf("first call: %v", f.ts.names()) + } + // Chronological sequence across all mocks (uses shared clock): + combined := f.orderedNames() + if !containsAll(combined, wantCalls...) { + t.Errorf("missing expected calls; got combined=%v", combined) + } + + // pfSense should NOT have been touched. + if len(f.pf.names()) != 0 { + t.Errorf("expected no pfSense calls, got %v", f.pf.names()) + } + + // State cache updated to new node. + got, err := f.store.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got == nil || got.Name != f.newNode.Name { + t.Errorf("state.Active = %v, want %s", got, f.newNode.Name) + } + + // Old node should be destroyed (best-effort, but called). + if !hasCallWithArg(f.prov.calls, "Destroy", f.oldNode.Name) { + t.Errorf("expected Destroy(%s) call, got %v", f.oldNode.Name, f.prov.calls) + } + if !hasCallWithArg(f.ts.calls, "DeleteDevice", f.oldNode.DeviceID) { + t.Errorf("expected DeleteDevice(%s) call, got %v", f.oldNode.DeviceID, f.ts.calls) + } + + // New node should NOT have been destroyed. + if hasCallWithArg(f.prov.calls, "Destroy", f.newNode.Name) { + t.Errorf("new node was destroyed on happy path; calls=%v", f.prov.calls) + } +} + +func containsAll(haystack []string, needles ...string) bool { + idx := 0 + for _, h := range haystack { + if idx < len(needles) && h == needles[idx] { + idx++ + } + } + return idx == len(needles) +} + +func hasCallWithArg(calls []callRecord, name string, arg any) bool { + for _, c := range calls { + if c.Name != name { + continue + } + for _, a := range c.Args { + if reflect.DeepEqual(a, arg) { + return true + } + } + } + return false +} + +// Sentinel to prevent "imported and not used" if errors becomes unused later. +var _ = errors.New + +func TestRotate_PrePFSenseFailureCases(t *testing.T) { + tests := []struct { + name string + mutate func(*rotateFixture) + wantErrSubstr string + wantDestroyNew bool // true if we expect Destroy(newNode.Name) + wantDelDevice bool // true if we expect DeleteDevice(newDev.ID) + }{ + { + name: "mint auth key fails", + mutate: func(f *rotateFixture) { f.ts.MintErr = errors.New("boom mint") }, + wantErrSubstr: "mint ephemeral auth key", + wantDestroyNew: false, // no VM created yet + wantDelDevice: false, + }, + { + name: "provision fails", + mutate: func(f *rotateFixture) { f.prov.ProvisionErr = errors.New("boom provision") }, + wantErrSubstr: "provision new node", + wantDestroyNew: false, + wantDelDevice: false, + }, + { + name: "register timeout", + mutate: func(f *rotateFixture) { f.ts.WaitErr = errors.New("timeout") }, + wantErrSubstr: "wait for device", + wantDestroyNew: true, + wantDelDevice: false, // device never registered + }, + { + name: "authorize fails", + mutate: func(f *rotateFixture) { f.ts.AuthorizeErr = errors.New("nope") }, + wantErrSubstr: "authorize exit node", + wantDestroyNew: true, + wantDelDevice: true, + }, + { + name: "set tags fails", + mutate: func(f *rotateFixture) { f.ts.SetTagsErr = errors.New("tag fail") }, + wantErrSubstr: "set tags", + wantDestroyNew: true, + wantDelDevice: true, + }, + { + name: "probe error", + mutate: func(f *rotateFixture) { f.probe.EgressViaErr = errors.New("probe fail") }, + wantErrSubstr: "pre-cutover probe", + wantDestroyNew: true, + wantDelDevice: true, + }, + { + name: "probe egress IP mismatch", + mutate: func(f *rotateFixture) { f.probe.EgressViaResult = "1.2.3.4" /* != newNode.PublicIP */ }, + wantErrSubstr: "egress IP mismatch", + wantDestroyNew: true, + wantDelDevice: true, + }, + } + for _, tc := range tests { + t.Run(tc.name, func(t *testing.T) { + f := newRotateFixture(t) + f.cfg.Behavior.AutoSyncPFSense = false + tc.mutate(f) + + _, err := f.core.Rotate(context.Background(), RotateOpts{Region: "asia-southeast1"}) + if err == nil { + t.Fatalf("expected error, got nil") + } + if !contains(err.Error(), tc.wantErrSubstr) { + t.Errorf("err = %q, want substring %q", err.Error(), tc.wantErrSubstr) + } + + gotDestroyNew := hasCallWithArg(f.prov.calls, "Destroy", f.newNode.Name) + gotDelDev := hasCallWithArg(f.ts.calls, "DeleteDevice", f.newDev.ID) + if gotDestroyNew != tc.wantDestroyNew { + t.Errorf("Destroy(new) = %v, want %v (calls=%v)", gotDestroyNew, tc.wantDestroyNew, f.prov.calls) + } + if gotDelDev != tc.wantDelDevice { + t.Errorf("DeleteDevice(new) = %v, want %v (calls=%v)", gotDelDev, tc.wantDelDevice, f.ts.calls) + } + + // Old node MUST NOT be destroyed in any pre-pfSense failure. + if hasCallWithArg(f.prov.calls, "Destroy", f.oldNode.Name) { + t.Errorf("old node was destroyed on failure; calls=%v", f.prov.calls) + } + }) + } +} + +func contains(s, substr string) bool { + for i := 0; i+len(substr) <= len(s); i++ { + if s[i:i+len(substr)] == substr { + return true + } + } + return false +} + +func TestRotate_PFSenseFailures_RevertSucceeds(t *testing.T) { + tests := []struct { + name string + mutate func(*rotateFixture) + wantErrSubstr string + // Whether we expect the gateway to be back at the old IP after revert. + wantGatewayRestored bool + }{ + { + name: "UpdateGatewayIP fails (no Apply yet)", + mutate: func(f *rotateFixture) { + // Force UpdateGatewayIP(_, newTSIP) to fail. + f.pf.UpdateErr[f.newDev.TailscaleIP] = errors.New("update boom") + }, + wantErrSubstr: "update pfsense gateway", + wantGatewayRestored: true, + }, + { + name: "Apply fails, revert succeeds", + mutate: func(f *rotateFixture) { + // First Apply errors; the revert's Apply succeeds. + f.pf.ApplyErr = []error{errors.New("apply boom"), nil} + }, + wantErrSubstr: "apply pfsense changes", + wantGatewayRestored: true, + }, + } + for _, tc := range tests { + t.Run(tc.name, func(t *testing.T) { + f := newRotateFixture(t) + f.cfg.Behavior.AutoSyncPFSense = true + tc.mutate(f) + + _, err := f.core.Rotate(context.Background(), RotateOpts{Region: "asia-southeast1"}) + if err == nil { + t.Fatalf("expected error, got nil") + } + if !contains(err.Error(), tc.wantErrSubstr) { + t.Errorf("err = %q, want %q", err.Error(), tc.wantErrSubstr) + } + + // New node MUST be destroyed (cleanup ran). + if !hasCallWithArg(f.prov.calls, "Destroy", f.newNode.Name) { + t.Errorf("expected Destroy(new); calls=%v", f.prov.calls) + } + if !hasCallWithArg(f.ts.calls, "DeleteDevice", f.newDev.ID) { + t.Errorf("expected DeleteDevice(new); calls=%v", f.ts.calls) + } + + // Gateway should be back at old IP. + if tc.wantGatewayRestored { + if got := f.pf.Gateways["GW"]; got != "100.64.0.1" { + t.Errorf("gateway IP = %s, want 100.64.0.1 (old)", got) + } + } + + // Old node MUST NOT be destroyed. + if hasCallWithArg(f.prov.calls, "Destroy", f.oldNode.Name) { + t.Errorf("old node was destroyed; calls=%v", f.prov.calls) + } + + // Error must NOT be a *CriticalError (revert succeeded). + var crit *CriticalError + if errors.As(err, &crit) { + t.Errorf("got CriticalError, want plain error: %v", crit) + } + }) + } +} + +func TestRotate_CriticalCase_ApplyAndRevertBothFail(t *testing.T) { + f := newRotateFixture(t) + f.cfg.Behavior.AutoSyncPFSense = true + + // First Apply errors. The revert's UpdateGatewayIP errors too. + f.pf.ApplyErr = []error{errors.New("apply boom"), errors.New("apply revert boom")} + f.pf.UpdateErr["100.64.0.1"] = errors.New("revert update boom") // the revert IP + + _, err := f.core.Rotate(context.Background(), RotateOpts{Region: "asia-southeast1"}) + if err == nil { + t.Fatalf("expected CriticalError, got nil") + } + var crit *CriticalError + if !errors.As(err, &crit) { + t.Fatalf("expected *CriticalError, got %T: %v", err, err) + } + if crit.NewNodeName != f.newNode.Name { + t.Errorf("NewNodeName = %q, want %q", crit.NewNodeName, f.newNode.Name) + } + if crit.NewDeviceID != f.newDev.ID { + t.Errorf("NewDeviceID = %q, want %q", crit.NewDeviceID, f.newDev.ID) + } + if crit.PrimaryErr == nil || crit.RevertErr == nil { + t.Errorf("PrimaryErr / RevertErr must both be non-nil; got primary=%v revert=%v", + crit.PrimaryErr, crit.RevertErr) + } + + // HARD INVARIANT: new node NOT destroyed. + if hasCallWithArg(f.prov.calls, "Destroy", f.newNode.Name) { + t.Errorf("CRITICAL: new node was destroyed during critical-case rotate; calls=%v", f.prov.calls) + } + if hasCallWithArg(f.ts.calls, "DeleteDevice", f.newDev.ID) { + t.Errorf("CRITICAL: new device was deleted during critical-case rotate; calls=%v", f.ts.calls) + } + + // Old node also NOT destroyed. + if hasCallWithArg(f.prov.calls, "Destroy", f.oldNode.Name) { + t.Errorf("old node was destroyed during critical-case rotate; calls=%v", f.prov.calls) + } +} + +func TestRotate_PostCutoverProbeFails_RevertsAndDestroys(t *testing.T) { + f := newRotateFixture(t) + f.cfg.Behavior.AutoSyncPFSense = true + f.cfg.Behavior.VerifyPostCutover = true + + // Pre-cutover probe succeeds (returns matching IP). + // Post-cutover probe (EgressDirect) returns wrong IP. + f.probe.EgressDirectResult = "1.1.1.1" + + _, err := f.core.Rotate(context.Background(), RotateOpts{Region: "asia-southeast1"}) + if err == nil { + t.Fatalf("expected error") + } + if !contains(err.Error(), "post-cutover probe") { + t.Errorf("err = %q, want post-cutover probe", err.Error()) + } + + // Gateway must be reverted. + if got := f.pf.Gateways["GW"]; got != "100.64.0.1" { + t.Errorf("gateway = %s, want 100.64.0.1", got) + } + // New node destroyed. + if !hasCallWithArg(f.prov.calls, "Destroy", f.newNode.Name) { + t.Errorf("expected Destroy(new); calls=%v", f.prov.calls) + } + // Old node NOT destroyed. + if hasCallWithArg(f.prov.calls, "Destroy", f.oldNode.Name) { + t.Errorf("old node was destroyed; calls=%v", f.prov.calls) + } +} + +func TestRotate_OldNodeTeardownFailuresAreNonFatal(t *testing.T) { + f := newRotateFixture(t) + f.cfg.Behavior.AutoSyncPFSense = true + f.prov.DestroyErr[f.oldNode.Name] = errors.New("destroy old boom") + f.ts.DeleteDeviceErr[f.oldNode.DeviceID] = errors.New("delete old device boom") + + res, err := f.core.Rotate(context.Background(), RotateOpts{Region: "asia-southeast1"}) + if err != nil { + t.Fatalf("expected success despite old-teardown errors, got %v", err) + } + if res.New == nil || res.New.Name != f.newNode.Name { + t.Errorf("res.New = %v", res.New) + } + // State was updated to new node despite teardown failures. + got, err := f.store.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got == nil || got.Name != f.newNode.Name { + t.Errorf("state.Active = %v, want %s", got, f.newNode.Name) + } +} + +func TestRotateHappyPath_WithPFSense(t *testing.T) { + f := newRotateFixture(t) + f.cfg.Behavior.AutoSyncPFSense = true + + res, err := f.core.Rotate(context.Background(), RotateOpts{Region: "asia-southeast1"}) + if err != nil { + t.Fatalf("Rotate err = %v", err) + } + if res.New == nil || res.New.Name != f.newNode.Name { + t.Errorf("res.New = %v", res.New) + } + + wantPFCalls := []string{"GetGateway", "UpdateGatewayIP", "Apply"} + if !reflect.DeepEqual(f.pf.names(), wantPFCalls) { + t.Errorf("pfSense calls = %v, want %v", f.pf.names(), wantPFCalls) + } + if got := f.pf.Gateways["GW"]; got != f.newDev.TailscaleIP { + t.Errorf("gateway IP = %s, want %s", got, f.newDev.TailscaleIP) + } +} diff --git a/internal/core/status.go b/internal/core/status.go new file mode 100644 index 0000000..e8d6eef --- /dev/null +++ b/internal/core/status.go @@ -0,0 +1,39 @@ +package core + +import ( + "context" + "fmt" + + "github.com/iker/exit-node/internal/gcp" +) + +// StatusResult is the result of a Status call. +type StatusResult struct { + Cached *gcp.ExitNode // from state.json; nil if no active + Live *gcp.ExitNode // freshly fetched from the provider; nil if Cached is nil +} + +// Drift reports whether the live state differs from the cached state. +func (s *StatusResult) Drift() bool { + if s.Cached == nil || s.Live == nil { + return s.Cached != s.Live // both nil = no drift + } + return s.Cached.State != s.Live.State || s.Cached.PublicIP != s.Live.PublicIP +} + +// Status fetches the cached active node and the live provider record. +func (c *Core) Status(ctx context.Context) (*StatusResult, error) { + cached, err := c.store.GetActive() + if err != nil { + return nil, fmt.Errorf("read state: %w", err) + } + out := &StatusResult{Cached: cached} + if cached != nil { + live, err := c.provider.Get(ctx, cached.Name) + if err != nil { + return nil, fmt.Errorf("get live: %w", err) + } + out.Live = live + } + return out, nil +} diff --git a/internal/core/status_test.go b/internal/core/status_test.go new file mode 100644 index 0000000..9babba6 --- /dev/null +++ b/internal/core/status_test.go @@ -0,0 +1,59 @@ +package core + +import ( + "context" + "log/slog" + "testing" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/state" +) + +func TestStatus_ActiveExists(t *testing.T) { + statePath := t.TempDir() + "/state.json" + store, _ := state.Open(statePath) + defer store.Close() + active := &gcp.ExitNode{Name: "v1", State: gcp.StateStopped} + _ = store.SetActive(active) + + prov := newMockProvider() + // Provider now reports Running — drift from state cache. + prov.GetResult["v1"] = &gcp.ExitNode{Name: "v1", State: gcp.StateRunning} + c := New(Deps{ + Config: &config.Config{}, Provider: prov, TS: newMockTS(), + PF: newMockPF(), Probe: &mockProbe{}, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) + got, err := c.Status(context.Background()) + if err != nil { + t.Fatalf("Status: %v", err) + } + if got.Cached == nil || got.Cached.Name != "v1" { + t.Errorf("Cached = %v", got.Cached) + } + if got.Live == nil || got.Live.State != gcp.StateRunning { + t.Errorf("Live = %v", got.Live) + } + if !got.Drift() { + t.Errorf("expected Drift=true") + } +} + +func TestStatus_NoActive(t *testing.T) { + statePath := t.TempDir() + "/state.json" + store, _ := state.Open(statePath) + defer store.Close() + c := New(Deps{ + Config: &config.Config{}, Provider: newMockProvider(), TS: newMockTS(), + PF: newMockPF(), Probe: &mockProbe{}, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) + got, err := c.Status(context.Background()) + if err != nil { + t.Fatalf("Status: %v", err) + } + if got.Cached != nil || got.Live != nil { + t.Errorf("expected nil/nil, got %+v", got) + } +} diff --git a/internal/core/sync.go b/internal/core/sync.go new file mode 100644 index 0000000..5081095 --- /dev/null +++ b/internal/core/sync.go @@ -0,0 +1,33 @@ +package core + +import ( + "context" + "fmt" +) + +// SyncPFSense pushes the active node's Tailscale IP to the configured +// pfSense gateway. Idempotent: if the gateway already matches, no write +// happens. +func (c *Core) SyncPFSense(ctx context.Context) error { + active, err := c.store.GetActive() + if err != nil { + return fmt.Errorf("read state: %w", err) + } + if active == nil { + return ErrNoActiveNode + } + gw, err := c.pf.GetGateway(ctx, c.cfg.PFSense.GatewayName) + if err != nil { + return fmt.Errorf("get gateway: %w", err) + } + if gw.IP == active.TailscaleIP { + return nil + } + if err := c.pf.UpdateGatewayIP(ctx, c.cfg.PFSense.GatewayName, active.TailscaleIP); err != nil { + return fmt.Errorf("update gateway: %w", err) + } + if err := c.pf.Apply(ctx); err != nil { + return fmt.Errorf("apply: %w", err) + } + return nil +} diff --git a/internal/core/sync_test.go b/internal/core/sync_test.go new file mode 100644 index 0000000..e28c38a --- /dev/null +++ b/internal/core/sync_test.go @@ -0,0 +1,69 @@ +package core + +import ( + "context" + "errors" + "log/slog" + "reflect" + "testing" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/state" +) + +func syncFixture(t *testing.T, active *gcp.ExitNode, gwIP string) *rotateFixture { + t.Helper() + statePath := t.TempDir() + "/state.json" + store, err := state.Open(statePath) + if err != nil { + t.Fatalf("state.Open: %v", err) + } + t.Cleanup(func() { _ = store.Close() }) + if active != nil { + _ = store.SetActive(active) + } + pf := newMockPF() + pf.Gateways["GW"] = gwIP + c := New(Deps{ + Config: &config.Config{PFSense: config.PFSenseConfig{GatewayName: "GW"}}, + Provider: newMockProvider(), TS: newMockTS(), + PF: pf, Probe: &mockProbe{}, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) + return &rotateFixture{store: store, core: c, pf: pf} +} + +func TestSync_NoopWhenGatewayMatches(t *testing.T) { + active := &gcp.ExitNode{Name: "v1", TailscaleIP: "100.64.0.99"} + f := syncFixture(t, active, "100.64.0.99") + if err := f.core.SyncPFSense(context.Background()); err != nil { + t.Fatalf("SyncPFSense: %v", err) + } + want := []string{"GetGateway"} + if !reflect.DeepEqual(f.pf.names(), want) { + t.Errorf("calls = %v, want %v", f.pf.names(), want) + } +} + +func TestSync_PushesWhenGatewayDiffers(t *testing.T) { + active := &gcp.ExitNode{Name: "v1", TailscaleIP: "100.64.0.99"} + f := syncFixture(t, active, "100.64.0.1") + if err := f.core.SyncPFSense(context.Background()); err != nil { + t.Fatalf("SyncPFSense: %v", err) + } + want := []string{"GetGateway", "UpdateGatewayIP", "Apply"} + if !reflect.DeepEqual(f.pf.names(), want) { + t.Errorf("calls = %v, want %v", f.pf.names(), want) + } + if got := f.pf.Gateways["GW"]; got != "100.64.0.99" { + t.Errorf("gateway = %s, want 100.64.0.99", got) + } +} + +func TestSync_NoActive(t *testing.T) { + f := syncFixture(t, nil, "100.64.0.1") + if err := f.core.SyncPFSense(context.Background()); !errors.Is(err, ErrNoActiveNode) { + t.Errorf("err = %v, want ErrNoActiveNode", err) + } +} diff --git a/internal/core/up.go b/internal/core/up.go new file mode 100644 index 0000000..53273ed --- /dev/null +++ b/internal/core/up.go @@ -0,0 +1,91 @@ +package core + +import ( + "context" + "fmt" + + "github.com/iker/exit-node/internal/gcp" +) + +// UpOpts controls a single Up invocation. +type UpOpts struct { + Region string // empty → cfg.GCP.DefaultRegion + MachineType string // empty → cfg.GCP.DefaultMachineType +} + +// Up provisions an exit node if none is recorded as active. If one already +// exists, returns it unchanged (idempotent). +func (c *Core) Up(ctx context.Context, opts UpOpts) (*gcp.ExitNode, error) { + if existing, err := c.store.GetActive(); err != nil { + return nil, fmt.Errorf("read state: %w", err) + } else if existing != nil { + return existing, nil + } + + region := opts.Region + if region == "" { + region = c.cfg.GCP.DefaultRegion + } + machine := opts.MachineType + if machine == "" { + machine = c.cfg.GCP.DefaultMachineType + } + + authKey, err := c.ts.MintEphemeralAuthKey(ctx, c.cfg.Tailscale.Tags) + if err != nil { + return nil, fmt.Errorf("mint ephemeral auth key: %w", err) + } + name := genName(region) + node, err := c.provider.Provision(ctx, gcp.ProvisionOpts{ + Name: name, + Region: region, + Zone: c.cfg.GCP.DefaultZone, + MachineType: machine, + Hostname: name, + TailscaleAuthKey: authKey, + Tags: c.cfg.Tailscale.Tags, + InstallScriptURL: c.cfg.Behavior.InstallScriptURL, + DiskSizeGB: c.cfg.GCP.DiskSizeGB, + Network: c.cfg.GCP.Network, + }) + if err != nil { + return nil, fmt.Errorf("provision: %w", err) + } + dev, err := c.ts.WaitForDevice(ctx, node.Name, c.cfg.Behavior.RegistrationTimeout) + if err != nil { + // Best-effort destroy on registration failure to avoid orphans. + _ = c.provider.Destroy(context.Background(), node.Name) + return nil, fmt.Errorf("wait for device: %w", err) + } + if err := c.ts.AuthorizeExitNode(ctx, dev.ID); err != nil { + _ = c.ts.DeleteDevice(context.Background(), dev.ID) + _ = c.provider.Destroy(context.Background(), node.Name) + return nil, fmt.Errorf("authorize: %w", err) + } + if err := c.ts.SetTags(ctx, dev.ID, c.cfg.Tailscale.Tags); err != nil { + _ = c.ts.DeleteDevice(context.Background(), dev.ID) + _ = c.provider.Destroy(context.Background(), node.Name) + return nil, fmt.Errorf("set tags: %w", err) + } + node.TailscaleIP = dev.TailscaleIP + node.DeviceID = dev.ID + + if c.cfg.Behavior.VerifyPreCutover { + egress, err := c.probe.EgressVia(ctx, dev.TailscaleIP) + if err != nil { + _ = c.ts.DeleteDevice(context.Background(), dev.ID) + _ = c.provider.Destroy(context.Background(), node.Name) + return nil, fmt.Errorf("probe: %w", err) + } + if egress != node.PublicIP { + _ = c.ts.DeleteDevice(context.Background(), dev.ID) + _ = c.provider.Destroy(context.Background(), node.Name) + return nil, fmt.Errorf("egress IP mismatch: got %s, want %s", egress, node.PublicIP) + } + } + + if err := c.store.SetActive(node); err != nil { + c.log.Warn("failed to update state cache", "err", err) + } + return node, nil +} diff --git a/internal/core/up_test.go b/internal/core/up_test.go new file mode 100644 index 0000000..1e4e336 --- /dev/null +++ b/internal/core/up_test.go @@ -0,0 +1,93 @@ +package core + +import ( + "context" + "errors" + "log/slog" + "testing" + "time" + + "github.com/iker/exit-node/internal/config" + "github.com/iker/exit-node/internal/gcp" + "github.com/iker/exit-node/internal/state" + "github.com/iker/exit-node/internal/tailscale" +) + +func upFixture(t *testing.T) *rotateFixture { + t.Helper() + statePath := t.TempDir() + "/state.json" + store, err := state.Open(statePath) + if err != nil { + t.Fatalf("state.Open: %v", err) + } + t.Cleanup(func() { _ = store.Close() }) + + newN := &gcp.ExitNode{ + Name: "vpn-up-1", Region: "us-west1", Zone: "us-west1-a", + MachineType: "e2-micro", PublicIP: "35.5.5.5", + State: gcp.StateRunning, CreatedAt: time.Now(), + } + dev := &tailscale.Device{ID: "dev-up", Hostname: "vpn-up-1", TailscaleIP: "100.64.0.55"} + + cfg := &config.Config{ + GCP: config.GCPConfig{ + Project: "p", DefaultRegion: "us-west1", DefaultMachineType: "e2-micro", + Network: "default", DiskSizeGB: 10, + }, + Tailscale: config.TailscaleConfig{Tags: []string{"tag:exit-node"}, EphemeralKeyTTL: 5 * time.Minute}, + Behavior: config.BehaviorConfig{ + VerifyPreCutover: true, + ProbeURL: "https://example.com/ip", + RegistrationTimeout: 90 * time.Second, + InstallScriptURL: "https://example.com/install.sh", + }, + } + prov := newMockProvider() + prov.ProvisionResult = newN + ts := newMockTS() + ts.WaitDevice = dev + probe := &mockProbe{EgressViaResult: newN.PublicIP} + pf := newMockPF() + c := New(Deps{ + Config: cfg, Provider: prov, TS: ts, PF: pf, Probe: probe, + Store: store, Logger: slog.New(slog.NewTextHandler(testWriter{t}, nil)), + }) + return &rotateFixture{ + cfg: cfg, prov: prov, ts: ts, pf: pf, probe: probe, store: store, core: c, + newNode: newN, newDev: dev, + } +} + +func TestUp_CreatesWhenNoActive(t *testing.T) { + f := upFixture(t) + got, err := f.core.Up(context.Background(), UpOpts{}) + if err != nil { + t.Fatalf("Up: %v", err) + } + if got == nil || got.Name != f.newNode.Name { + t.Errorf("got %v, want %s", got, f.newNode.Name) + } + if !hasCallWithArg(f.prov.calls, "Provision", "") && len(f.prov.names()) == 0 { + t.Errorf("Provision was not called; calls=%v", f.prov.calls) + } +} + +func TestUp_NoopWhenActiveExists(t *testing.T) { + f := upFixture(t) + existing := &gcp.ExitNode{Name: "already-up", State: gcp.StateRunning} + if err := f.store.SetActive(existing); err != nil { + t.Fatalf("seed: %v", err) + } + got, err := f.core.Up(context.Background(), UpOpts{}) + if err != nil { + t.Fatalf("Up: %v", err) + } + if got.Name != "already-up" { + t.Errorf("got %v, want already-up", got) + } + if len(f.prov.names()) != 0 { + t.Errorf("expected no provider calls; got %v", f.prov.names()) + } +} + +var _ = errors.New diff --git a/internal/gcp/compute.go b/internal/gcp/compute.go new file mode 100644 index 0000000..69edd4c --- /dev/null +++ b/internal/gcp/compute.go @@ -0,0 +1,416 @@ +// Package gcp's concrete Provider impl using cloud.google.com/go/compute/apiv1. +// The interface is declared in provider.go (Plan 1); this file implements +// it against real Compute Engine. +package gcp + +import ( + "context" + "errors" + "fmt" + "math/rand/v2" + "strings" + "time" + + compute "cloud.google.com/go/compute/apiv1" + "cloud.google.com/go/compute/apiv1/computepb" + "google.golang.org/api/iterator" + "google.golang.org/api/option" + "google.golang.org/protobuf/proto" +) + +// ErrInstanceNotFound is returned by findInstance when no managed instance +// matches the given name. Destroy uses errors.Is to treat this as an +// idempotent no-op during rotate cleanup. +var ErrInstanceNotFound = errors.New("gcp: instance not found") + +const ( + // labelManagedBy is the GCP instance label key we apply to every + // managed exit-node so we can filter aggregated lists by it. + labelManagedBy = "managed-by" + // labelManagedByValue is the value paired with labelManagedBy. + labelManagedByValue = "exitnode" + // filterManagedByExitnode is the AggregatedList filter expression + // matching only instances with the managed-by=exitnode label. + filterManagedByExitnode = "labels." + labelManagedBy + "=" + labelManagedByValue +) + +// Options configures the GCP Provider. +type Options struct { + // Project is the GCP project ID. Required. + Project string + // Region is the default region used when ProvisionOpts.Region is + // empty. Optional but typically set from config. + Region string + // CredentialsJSON, if non-empty, is parsed as a service-account + // JSON key. Otherwise the underlying clients fall back to ADC + // (GOOGLE_APPLICATION_CREDENTIALS or the metadata server). + CredentialsJSON []byte + // Network is the VPC network name to attach instances to (default + // "default" if empty). + Network string + // InstallScriptURL is the URL pushed to VM metadata as + // startup-script-url. + InstallScriptURL string + // DiskSizeGB is the boot disk size in GB; default 10. + DiskSizeGB int64 +} + +// gcpProvider implements Provider. +type gcpProvider struct { + instances *compute.InstancesClient + zones *compute.ZonesClient + project string + region string + network string + scriptURL string + diskGB int64 +} + +// Compile-time assertion. +var _ Provider = (*gcpProvider)(nil) + +// New constructs a Provider. With CredentialsJSON empty, falls back to +// Application Default Credentials. +func New(ctx context.Context, opts Options) (Provider, error) { + if strings.TrimSpace(opts.Project) == "" { + return nil, errors.New("gcp: Project required") + } + if opts.DiskSizeGB == 0 { + opts.DiskSizeGB = 10 + } + if strings.TrimSpace(opts.Network) == "" { + opts.Network = "default" + } + + var clientOpts []option.ClientOption + if len(opts.CredentialsJSON) > 0 { + // SA1019: option.WithCredentialsJSON is marked deprecated because the + // upstream auth library cannot validate JSON it receives. Our caller + // is the operator (config + env var GCP_CREDENTIALS_JSON), which we + // control; the deprecation's threat model doesn't apply. Re-evaluate + // when we migrate to cloud.google.com/go/auth. + clientOpts = append(clientOpts, option.WithCredentialsJSON(opts.CredentialsJSON)) //nolint:staticcheck + } + + inst, err := compute.NewInstancesRESTClient(ctx, clientOpts...) + if err != nil { + return nil, fmt.Errorf("gcp: new instances client: %w", err) + } + zones, err := compute.NewZonesRESTClient(ctx, clientOpts...) + if err != nil { + _ = inst.Close() + return nil, fmt.Errorf("gcp: new zones client: %w", err) + } + return &gcpProvider{ + instances: inst, + zones: zones, + project: opts.Project, + region: opts.Region, + network: opts.Network, + scriptURL: opts.InstallScriptURL, + diskGB: opts.DiskSizeGB, + }, nil +} + +// Close releases the underlying gRPC connections. Exposed for tests + +// graceful shutdown. +func (p *gcpProvider) Close() error { + var err error + if e := p.instances.Close(); e != nil { + err = e + } + if e := p.zones.Close(); e != nil && err == nil { + err = e + } + return err +} + +// Provision creates a new VM with the configured labels + metadata, +// waits for it to reach RUNNING, and returns the populated ExitNode +// record (including the assigned public IP). +// +// Zone selection: if opts.Zone is empty, the caller is expected to +// have resolved a zone first (e.g., via PickZoneInRegion). v0.1 does +// not implement auto-pick inside Provision because zone-picking +// touches a separate API surface (ZonesClient). +func (p *gcpProvider) Provision(ctx context.Context, opts ProvisionOpts) (*ExitNode, error) { + if opts.Zone == "" { + return nil, fmt.Errorf("gcp: Provision requires opts.Zone (auto-pick TODO)") + } + inst := p.buildInstanceResource(opts) + + op, err := p.instances.Insert(ctx, &computepb.InsertInstanceRequest{ + Project: p.project, + Zone: opts.Zone, + InstanceResource: inst, + }) + if err != nil { + return nil, fmt.Errorf("gcp: instances.Insert: %w", err) + } + if err := op.Wait(ctx); err != nil { + return nil, fmt.Errorf("gcp: wait for insert: %w", err) + } + + got, err := p.instances.Get(ctx, &computepb.GetInstanceRequest{ + Project: p.project, Zone: opts.Zone, Instance: opts.Name, + }) + if err != nil { + return nil, fmt.Errorf("gcp: instances.Get after insert: %w", err) + } + return instanceToExitNode(got), nil +} + +// instanceToExitNode converts a Compute API Instance to our ExitNode. +func instanceToExitNode(inst *computepb.Instance) *ExitNode { + out := &ExitNode{ + Name: inst.GetName(), + Zone: lastPathSegment(inst.GetZone()), + MachineType: lastPathSegment(inst.GetMachineType()), + State: parseInstanceStatus(inst.GetStatus()), + } + out.Region = inst.GetLabels()["region"] + if t := inst.GetCreationTimestamp(); t != "" { + // RFC3339 from compute API. + if parsed, err := time.Parse(time.RFC3339, t); err == nil { + out.CreatedAt = parsed + } + } +outer: + for _, nic := range inst.GetNetworkInterfaces() { + for _, ac := range nic.GetAccessConfigs() { + if ip := ac.GetNatIP(); ip != "" { + out.PublicIP = ip + break outer + } + } + } + return out +} + +// parseInstanceStatus maps Compute's status strings to our State enum. +func parseInstanceStatus(s string) State { + switch s { + case "PROVISIONING", "STAGING": + return StatePending + case "RUNNING": + return StateRunning + case "STOPPING", "STOPPED", "SUSPENDED": + return StateStopped + case "TERMINATED": + return StateTerminated + default: + return StateUnknown + } +} + +// lastPathSegment returns the substring after the final "/" — used to +// trim resource URLs like ".../zones/us-west1-a" down to "us-west1-a". +func lastPathSegment(s string) string { + i := strings.LastIndex(s, "/") + if i < 0 { + return s + } + return s[i+1:] +} + +// Start brings a stopped VM back online. +func (p *gcpProvider) Start(ctx context.Context, name string) error { + zone, _, err := p.findInstance(ctx, name) + if err != nil { + return err + } + op, err := p.instances.Start(ctx, &computepb.StartInstanceRequest{ + Project: p.project, Zone: zone, Instance: name, + }) + if err != nil { + return fmt.Errorf("gcp: instances.Start: %w", err) + } + return op.Wait(ctx) +} + +// Stop shuts down a VM (preserves disk). +func (p *gcpProvider) Stop(ctx context.Context, name string) error { + zone, _, err := p.findInstance(ctx, name) + if err != nil { + return err + } + op, err := p.instances.Stop(ctx, &computepb.StopInstanceRequest{ + Project: p.project, Zone: zone, Instance: name, + }) + if err != nil { + return fmt.Errorf("gcp: instances.Stop: %w", err) + } + return op.Wait(ctx) +} + +// Destroy deletes a VM permanently. +func (p *gcpProvider) Destroy(ctx context.Context, name string) error { + zone, _, err := p.findInstance(ctx, name) + if err != nil { + // If it's already gone, that's fine for rotate cleanup. + if errors.Is(err, ErrInstanceNotFound) { + return nil + } + return err + } + op, err := p.instances.Delete(ctx, &computepb.DeleteInstanceRequest{ + Project: p.project, Zone: zone, Instance: name, + }) + if err != nil { + return fmt.Errorf("gcp: instances.Delete: %w", err) + } + return op.Wait(ctx) +} + +// findInstance walks AggregatedList to locate a managed instance by +// name. Returns the zone (e.g., "us-west1-a") and the matching +// *computepb.Instance proto, or ErrInstanceNotFound (wrapped) if no +// managed instance with that name exists. +func (p *gcpProvider) findInstance(ctx context.Context, name string) (zone string, inst *computepb.Instance, err error) { + it := p.instances.AggregatedList(ctx, &computepb.AggregatedListInstancesRequest{ + Project: p.project, + Filter: proto.String(filterManagedByExitnode), + }) + for { + pair, iterErr := it.Next() + if errors.Is(iterErr, iterator.Done) { + break + } + if iterErr != nil { + return "", nil, fmt.Errorf("gcp: aggregated list: %w", iterErr) + } + // Pair is (zone-key, *InstancesScopedList). Zone key looks like "zones/us-west1-a". + for _, candidate := range pair.Value.GetInstances() { + if candidate.GetName() == name { + return lastPathSegment(pair.Key), candidate, nil + } + } + } + return "", nil, fmt.Errorf("%w: %q among managed nodes", ErrInstanceNotFound, name) +} + +// List returns all VMs managed by exitnode across all zones. +func (p *gcpProvider) List(ctx context.Context) ([]*ExitNode, error) { + it := p.instances.AggregatedList(ctx, &computepb.AggregatedListInstancesRequest{ + Project: p.project, + Filter: proto.String(filterManagedByExitnode), + }) + var out []*ExitNode + for { + pair, err := it.Next() + if errors.Is(err, iterator.Done) { + break + } + if err != nil { + return nil, fmt.Errorf("gcp: aggregated list: %w", err) + } + for _, inst := range pair.Value.GetInstances() { + out = append(out, instanceToExitNode(inst)) + } + } + return out, nil +} + +// Get fetches a single managed instance by name. Returns (nil, nil) if +// not found — the caller distinguishes "missing" from "error" by +// inspecting both return values. +func (p *gcpProvider) Get(ctx context.Context, name string) (*ExitNode, error) { + _, inst, err := p.findInstance(ctx, name) + if err != nil { + if errors.Is(err, ErrInstanceNotFound) { + return nil, nil + } + return nil, err + } + return instanceToExitNode(inst), nil +} + +// PickZoneInRegion returns a random UP zone within the given region. +// region must be a bare region name (e.g., "us-west1"), not a resource +// URL. Returns an error if region is empty or if no UP zones are +// found in that region. +// +// Not part of the Provider interface — callers type-assert to +// *gcpProvider. Zone selection lives here because it touches the +// separate ZonesClient API surface. +func (p *gcpProvider) PickZoneInRegion(ctx context.Context, region string) (string, error) { + if region == "" { + return "", errors.New("gcp: PickZoneInRegion: region required") + } + it := p.zones.List(ctx, &computepb.ListZonesRequest{ + Project: p.project, + Filter: proto.String("status = UP"), + }) + var ups []string + for { + z, err := it.Next() + if errors.Is(err, iterator.Done) { + break + } + if err != nil { + return "", fmt.Errorf("gcp: list zones: %w", err) + } + // z.GetRegion() is a full URL like ".../regions/us-west1". + if lastPathSegment(z.GetRegion()) != region { + continue + } + ups = append(ups, z.GetName()) + } + if len(ups) == 0 { + return "", fmt.Errorf("gcp: no UP zones in region %q", region) + } + return ups[rand.IntN(len(ups))], nil +} + +// buildInstanceResource constructs the *computepb.Instance that +// Provision passes to Insert. Separated so we can shape-test it +// without hitting the API. +func (p *gcpProvider) buildInstanceResource(opts ProvisionOpts) *computepb.Instance { + labels := map[string]string{ + labelManagedBy: labelManagedByValue, + "region": opts.Region, + } + + scriptURL := opts.InstallScriptURL + if scriptURL == "" { + scriptURL = p.scriptURL + } + diskGB := int64(opts.DiskSizeGB) + if diskGB == 0 { + diskGB = p.diskGB + } + network := opts.Network + if network == "" { + network = p.network + } + + return &computepb.Instance{ + Name: proto.String(opts.Name), + MachineType: proto.String(fmt.Sprintf("zones/%s/machineTypes/%s", opts.Zone, opts.MachineType)), + Labels: labels, + Disks: []*computepb.AttachedDisk{{ + Boot: proto.Bool(true), + AutoDelete: proto.Bool(true), + Type: proto.String("PERSISTENT"), + InitializeParams: &computepb.AttachedDiskInitializeParams{ + DiskSizeGb: proto.Int64(diskGB), + SourceImage: proto.String("projects/debian-cloud/global/images/family/debian-12"), + }, + }}, + NetworkInterfaces: []*computepb.NetworkInterface{{ + Network: proto.String("global/networks/" + network), + AccessConfigs: []*computepb.AccessConfig{{ + Type: proto.String("ONE_TO_ONE_NAT"), + Name: proto.String("External NAT"), + }}, + }}, + Metadata: &computepb.Metadata{ + Items: []*computepb.Items{ + {Key: proto.String("startup-script-url"), Value: proto.String(scriptURL)}, + {Key: proto.String("tailscale-auth-key"), Value: proto.String(opts.TailscaleAuthKey)}, + {Key: proto.String("tailscale-hostname"), Value: proto.String(opts.Hostname)}, + {Key: proto.String("tailscale-tags"), Value: proto.String(strings.Join(opts.Tags, ","))}, + }, + }, + } +} diff --git a/internal/gcp/compute_integration_test.go b/internal/gcp/compute_integration_test.go new file mode 100644 index 0000000..aba517f --- /dev/null +++ b/internal/gcp/compute_integration_test.go @@ -0,0 +1,58 @@ +//go:build integration + +package gcp + +import ( + "context" + "os" + "testing" + "time" +) + +func gateIntegration(t *testing.T) Options { + t.Helper() + if os.Getenv("EXITNODE_INTEGRATION") != "1" { + t.Skip("EXITNODE_INTEGRATION!=1; skipping real-GCP test") + } + proj := os.Getenv("EXITNODE_TEST_PROJECT") + if proj == "" { + t.Skip("EXITNODE_TEST_PROJECT unset; skipping") + } + opts := Options{ + Project: proj, + Region: envOr("EXITNODE_TEST_REGION", "us-central1"), + InstallScriptURL: "https://example.com/install.sh", // not actually run + } + if jsonKey := os.Getenv("GCP_CREDENTIALS_JSON"); jsonKey != "" { + opts.CredentialsJSON = []byte(jsonKey) + } + return opts +} + +func envOr(key, def string) string { + if v := os.Getenv(key); v != "" { + return v + } + return def +} + +func TestIntegration_ListIsCallable(t *testing.T) { + opts := gateIntegration(t) + ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second) + defer cancel() + p, err := New(ctx, opts) + if err != nil { + t.Fatalf("New: %v", err) + } + defer func() { + if err := p.(*gcpProvider).Close(); err != nil { + t.Errorf("Close: %v", err) + } + }() + + // We don't assert content (the test project may have no managed + // VMs); just that the call returns without error. + if _, err := p.List(ctx); err != nil { + t.Fatalf("List: %v", err) + } +} diff --git a/internal/gcp/compute_test.go b/internal/gcp/compute_test.go new file mode 100644 index 0000000..4a5f00e --- /dev/null +++ b/internal/gcp/compute_test.go @@ -0,0 +1,182 @@ +package gcp + +import ( + "context" + "testing" + + "cloud.google.com/go/compute/apiv1/computepb" + "google.golang.org/protobuf/proto" +) + +func TestNewWithoutCreds_UsesADC(t *testing.T) { + // Without GCP_CREDENTIALS_JSON set, New should still succeed — the + // underlying client lazily resolves ADC. We don't make any API + // calls in this test. + t.Setenv("GCP_CREDENTIALS_JSON", "") + t.Setenv("GOOGLE_APPLICATION_CREDENTIALS", "") + p, err := New(context.Background(), Options{ + Project: "test-proj", + Region: "us-west1", + }) + // New may or may not return an error here depending on whether + // ADC is available in the test env. The important assertions are: + // (a) it doesn't panic, and (b) when it succeeds, returns + // non-nil. CI runs in environments without ADC, so we tolerate + // either outcome. + if err == nil && p == nil { + t.Errorf("nil provider with nil error") + } +} + +func TestNewRequiresProject(t *testing.T) { + if _, err := New(context.Background(), Options{Region: "us-west1"}); err == nil { + t.Errorf("expected error for empty Project") + } +} + +func TestBuildInstanceResource_ShapesAllFields(t *testing.T) { + p := &gcpProvider{ + project: "test-proj", + region: "us-west1", + network: "default", + scriptURL: "https://example.com/install.sh", + diskGB: 20, + } + inst := p.buildInstanceResource(ProvisionOpts{ + Name: "vpn-test-1", + Region: "us-west1", + Zone: "us-west1-a", + MachineType: "e2-micro", + Hostname: "vpn-test-1", + TailscaleAuthKey: "tskey-secret", + Tags: []string{"tag:exit-node", "tag:home"}, + InstallScriptURL: "https://example.com/install.sh", + DiskSizeGB: 20, + Network: "default", + }) + + if got := inst.GetName(); got != "vpn-test-1" { + t.Errorf("Name = %q", got) + } + if got := inst.GetMachineType(); got != "zones/us-west1-a/machineTypes/e2-micro" { + t.Errorf("MachineType = %q", got) + } + labels := inst.GetLabels() + if labels["managed-by"] != "exitnode" { + t.Errorf("missing managed-by label: %v", labels) + } + if labels["region"] != "us-west1" { + t.Errorf("missing region label: %v", labels) + } + + // Boot disk: SourceImage points at Debian 12 family. + if len(inst.Disks) != 1 { + t.Fatalf("disks = %d, want 1", len(inst.Disks)) + } + disk := inst.Disks[0] + if !disk.GetBoot() { + t.Errorf("boot disk not flagged Boot=true") + } + if got := disk.InitializeParams.GetSourceImage(); got != "projects/debian-cloud/global/images/family/debian-12" { + t.Errorf("SourceImage = %q", got) + } + if got := disk.InitializeParams.GetDiskSizeGb(); got != 20 { + t.Errorf("DiskSizeGb = %d", got) + } + + // Public-IP NetworkInterface with one AccessConfig. + if len(inst.NetworkInterfaces) != 1 { + t.Fatalf("nics = %d, want 1", len(inst.NetworkInterfaces)) + } + nic := inst.NetworkInterfaces[0] + if nic.GetNetwork() != "global/networks/default" { + t.Errorf("Network = %q", nic.GetNetwork()) + } + if len(nic.AccessConfigs) != 1 || nic.AccessConfigs[0].GetType() != "ONE_TO_ONE_NAT" { + t.Errorf("AccessConfigs = %v", nic.AccessConfigs) + } + + // Metadata: startup-script-url + tailscale-auth-key + ...-hostname + ...-tags + got := map[string]string{} + for _, it := range inst.Metadata.Items { + got[it.GetKey()] = it.GetValue() + } + if got["startup-script-url"] != "https://example.com/install.sh" { + t.Errorf("startup-script-url = %q", got["startup-script-url"]) + } + if got["tailscale-auth-key"] != "tskey-secret" { + t.Errorf("tailscale-auth-key missing") + } + if got["tailscale-hostname"] != "vpn-test-1" { + t.Errorf("tailscale-hostname missing") + } + if got["tailscale-tags"] != "tag:exit-node,tag:home" { + t.Errorf("tailscale-tags = %q", got["tailscale-tags"]) + } +} + +func TestParseInstanceStatus(t *testing.T) { + cases := []struct { + in string + want State + }{ + {"PROVISIONING", StatePending}, + {"STAGING", StatePending}, + {"RUNNING", StateRunning}, + {"STOPPING", StateStopped}, + {"STOPPED", StateStopped}, + {"SUSPENDED", StateStopped}, + {"TERMINATED", StateTerminated}, + {"", StateUnknown}, + {"weird-new-state", StateUnknown}, + } + for _, c := range cases { + if got := parseInstanceStatus(c.in); got != c.want { + t.Errorf("parseInstanceStatus(%q) = %v, want %v", c.in, got, c.want) + } + } +} + +func TestLastPathSegment(t *testing.T) { + cases := []struct{ in, want string }{ + {"projects/p/zones/us-west1-a", "us-west1-a"}, + {"plain", "plain"}, + {"trailing/", ""}, + {"", ""}, + } + for _, c := range cases { + if got := lastPathSegment(c.in); got != c.want { + t.Errorf("lastPathSegment(%q) = %q, want %q", c.in, got, c.want) + } + } +} + +func TestInstanceToExitNode_PublicIPFromFirstAccessConfig(t *testing.T) { + inst := &computepb.Instance{ + Name: proto.String("vpn-1"), + Zone: proto.String("https://www.googleapis.com/.../zones/us-west1-a"), + MachineType: proto.String("https://www.googleapis.com/.../zones/us-west1-a/machineTypes/e2-micro"), + Status: proto.String("RUNNING"), + Labels: map[string]string{"region": "us-west1"}, + NetworkInterfaces: []*computepb.NetworkInterface{ + {AccessConfigs: []*computepb.AccessConfig{{NatIP: proto.String("1.2.3.4")}}}, + {AccessConfigs: []*computepb.AccessConfig{{NatIP: proto.String("5.6.7.8")}}}, + }, + } + got := instanceToExitNode(inst) + if got.PublicIP != "1.2.3.4" { + t.Errorf("PublicIP = %q, want 1.2.3.4 (first NIC's first AccessConfig)", got.PublicIP) + } + if got.Zone != "us-west1-a" { + t.Errorf("Zone = %q", got.Zone) + } + if got.MachineType != "e2-micro" { + t.Errorf("MachineType = %q", got.MachineType) + } + if got.State != StateRunning { + t.Errorf("State = %v, want StateRunning", got.State) + } + if got.Region != "us-west1" { + t.Errorf("Region = %q", got.Region) + } +} diff --git a/internal/gcp/provider.go b/internal/gcp/provider.go new file mode 100644 index 0000000..940c3fb --- /dev/null +++ b/internal/gcp/provider.go @@ -0,0 +1,18 @@ +package gcp + +import "context" + +// Provider abstracts the cloud backend that creates and manages exit-node +// VMs. Plan 1 only declares the interface; the concrete implementation +// lands in Plan 2. +type Provider interface { + Provision(ctx context.Context, opts ProvisionOpts) (*ExitNode, error) + Start(ctx context.Context, name string) error + Stop(ctx context.Context, name string) error + Destroy(ctx context.Context, name string) error + List(ctx context.Context) ([]*ExitNode, error) + // Get fetches a single managed instance by name. + // Returns (nil, nil) if no instance with that name exists; any other + // error (transport, permissions, etc.) is returned as (nil, err). + Get(ctx context.Context, name string) (*ExitNode, error) +} diff --git a/internal/gcp/types.go b/internal/gcp/types.go new file mode 100644 index 0000000..a463d55 --- /dev/null +++ b/internal/gcp/types.go @@ -0,0 +1,82 @@ +// Package gcp defines the GCP-backed exit-node types and the Provider +// interface. The concrete implementation lives in this package but is added +// in Plan 2; Plan 1 only sets the contract that internal/core consumes. +package gcp + +import ( + "fmt" + "strings" + "time" +) + +// State is the lifecycle state of an exit-node VM. +type State int + +const ( + StateUnknown State = iota + StatePending + StateRunning + StateStopped + StateTerminated +) + +func (s State) String() string { + switch s { + case StatePending: + return "pending" + case StateRunning: + return "running" + case StateStopped: + return "stopped" + case StateTerminated: + return "terminated" + default: + return "unknown" + } +} + +// ParseState parses a state string (case-insensitive). Unknown inputs return +// StateUnknown with a non-nil error. +func ParseState(s string) (State, error) { + switch strings.ToLower(s) { + case "pending": + return StatePending, nil + case "running": + return StateRunning, nil + case "stopped": + return StateStopped, nil + case "terminated": + return StateTerminated, nil + case "unknown": + return StateUnknown, nil + default: + return StateUnknown, fmt.Errorf("unknown state %q", s) + } +} + +// ExitNode is the canonical representation of a managed exit-node VM. +type ExitNode struct { + Name string + Region string + Zone string + MachineType string + PublicIP string + TailscaleIP string + DeviceID string + State State + CreatedAt time.Time +} + +// ProvisionOpts is the input to Provider.Provision. +type ProvisionOpts struct { + Name string // generated: vpn--- + Region string + Zone string // empty → provider chooses a random zone in Region + MachineType string + Hostname string // typically == Name + TailscaleAuthKey string // ephemeral, single-use, ~5m TTL + Tags []string // applied as both GCP labels and Tailscale tags + InstallScriptURL string + DiskSizeGB int + Network string +} diff --git a/internal/gcp/types_test.go b/internal/gcp/types_test.go new file mode 100644 index 0000000..28683b9 --- /dev/null +++ b/internal/gcp/types_test.go @@ -0,0 +1,47 @@ +package gcp + +import "testing" + +func TestStateString(t *testing.T) { + cases := []struct { + in State + want string + }{ + {StatePending, "pending"}, + {StateRunning, "running"}, + {StateStopped, "stopped"}, + {StateTerminated, "terminated"}, + {StateUnknown, "unknown"}, + } + for _, c := range cases { + if got := c.in.String(); got != c.want { + t.Errorf("State(%d).String() = %q, want %q", c.in, got, c.want) + } + } +} + +func TestParseState(t *testing.T) { + cases := []struct { + in string + want State + wantErr bool + }{ + {"pending", StatePending, false}, + {"PENDING", StatePending, false}, + {"running", StateRunning, false}, + {"stopped", StateStopped, false}, + {"terminated", StateTerminated, false}, + {"unknown", StateUnknown, false}, + {"banana", StateUnknown, true}, + {"", StateUnknown, true}, + } + for _, c := range cases { + got, err := ParseState(c.in) + if (err != nil) != c.wantErr { + t.Errorf("ParseState(%q) err = %v, wantErr = %v", c.in, err, c.wantErr) + } + if got != c.want { + t.Errorf("ParseState(%q) = %v, want %v", c.in, got, c.want) + } + } +} diff --git a/internal/pfsense/client.go b/internal/pfsense/client.go new file mode 100644 index 0000000..2faf43b --- /dev/null +++ b/internal/pfsense/client.go @@ -0,0 +1,10 @@ +package pfsense + +import "context" + +// PFSenseClient abstracts the pfSense gateway management API. +type PFSenseClient interface { + GetGateway(ctx context.Context, name string) (*Gateway, error) + UpdateGatewayIP(ctx context.Context, name, ip string) error + Apply(ctx context.Context) error +} diff --git a/internal/pfsense/rest.go b/internal/pfsense/rest.go new file mode 100644 index 0000000..9d3b348 --- /dev/null +++ b/internal/pfsense/rest.go @@ -0,0 +1,202 @@ +// Package pfsense holds the pfSense REST client. The interface is +// declared in client.go (Plan 1); this file is the concrete impl that +// talks to the community pfsense-api plugin (v2 endpoints). +package pfsense + +import ( + "context" + "crypto/tls" + "encoding/json" + "errors" + "fmt" + "io" + "net/http" + "net/url" + "strings" + "time" +) + +// Options configures the pfSense client. +type Options struct { + // BaseURL is the pfSense webConfigurator origin (e.g., + // "https://pfsense.lan"). No trailing slash required. + BaseURL string + // APIKey is the raw API key minted by the pfsense-api plugin. + // Sent as the value of the configured AuthHeader (default + // "Authorization", no "Bearer " prefix — that's what the plugin + // expects on v2). + APIKey string + // AuthHeader is the header name carrying the API key. Defaults to + // "Authorization" if empty. Exposed because some plugin builds + // accept "X-API-Key" instead. + AuthHeader string + // VerifyTLS controls server cert verification. Set false for + // pfSense's default self-signed cert; provide a real cert and set + // true for production. + VerifyTLS bool + // CACertPEM optionally pins a CA used to verify the server cert. + // Ignored if VerifyTLS is false. + CACertPEM []byte + // HTTPTimeout caps each request. Defaults to 30s if zero. + HTTPTimeout time.Duration +} + +// APIError is returned when the pfSense API responds with a non-2xx +// envelope code. +type APIError struct { + Code int // envelope.code (e.g., 404) + Status string // envelope.status (e.g., "error") + ResponseID string // envelope.response_id (e.g., "NOT_FOUND") + Message string // envelope.message +} + +func (e *APIError) Error() string { + return fmt.Sprintf("pfsense api: code=%d status=%s response_id=%s: %s", + e.Code, e.Status, e.ResponseID, e.Message) +} + +// pfClient is the concrete PFSenseClient. Unexported; New returns the +// interface. +type pfClient struct { + baseURL string + apiKey string + authHeader string + http *http.Client +} + +// New constructs a PFSenseClient. Returns the interface so the caller +// can't reach into the struct. +func New(opts Options) (PFSenseClient, error) { + if strings.TrimSpace(opts.APIKey) == "" { + return nil, errors.New("pfsense: APIKey required") + } + if strings.TrimSpace(opts.BaseURL) == "" { + return nil, errors.New("pfsense: BaseURL required") + } + if opts.HTTPTimeout == 0 { + opts.HTTPTimeout = 30 * time.Second + } + if opts.AuthHeader == "" { + opts.AuthHeader = "Authorization" + } + + tlsCfg := &tls.Config{InsecureSkipVerify: !opts.VerifyTLS} //nolint:gosec + // CA-cert pinning is a future enhancement; opts.CACertPEM ignored + // for v0.1. + + return &pfClient{ + baseURL: strings.TrimRight(opts.BaseURL, "/"), + apiKey: opts.APIKey, + authHeader: opts.AuthHeader, + http: &http.Client{ + Timeout: opts.HTTPTimeout, + Transport: &http.Transport{TLSClientConfig: tlsCfg}, + }, + }, nil +} + +// envelope is the wire shape of every pfsense-api v2 response. +type envelope struct { + Code int `json:"code"` + Status string `json:"status"` + ResponseID string `json:"response_id"` + Message string `json:"message"` + Data json.RawMessage `json:"data"` +} + +// decodeEnvelope reads a pfsense-api response body, returns *APIError +// for non-2xx envelope codes, and otherwise unmarshals envelope.data +// into `into`. Pass `new(any)` (or any other discardable) when there's +// no useful payload (e.g., POST /apply). +func decodeEnvelope(body []byte, into any) error { + var env envelope + if err := json.Unmarshal(body, &env); err != nil { + return fmt.Errorf("pfsense: parse envelope: %w (body=%q)", err, string(body)) + } + if env.Code < 200 || env.Code >= 300 { + return &APIError{ + Code: env.Code, Status: env.Status, + ResponseID: env.ResponseID, Message: env.Message, + } + } + if len(env.Data) == 0 || string(env.Data) == "null" { + return nil + } + if err := json.Unmarshal(env.Data, into); err != nil { + return fmt.Errorf("pfsense: parse envelope.data: %w", err) + } + return nil +} + +// Compile-time assertion that *pfClient implements PFSenseClient. +var _ PFSenseClient = (*pfClient)(nil) + +// GetGateway returns the named gateway. Translates 404 envelopes to +// *APIError so callers can distinguish "not found" from "transport +// error". +func (c *pfClient) GetGateway(ctx context.Context, name string) (*Gateway, error) { + body, _, err := c.do(ctx, http.MethodGet, + "/api/v2/routing/gateway?id="+url.QueryEscape(name), nil) + if err != nil { + return nil, fmt.Errorf("pfsense GET gateway: %w", err) + } + var raw struct { + Name string `json:"name"` + Gateway string `json:"gateway"` + } + if err := decodeEnvelope(body, &raw); err != nil { + return nil, err + } + return &Gateway{Name: raw.Name, IP: raw.Gateway}, nil +} + +// UpdateGatewayIP changes the configured IP of the named gateway. The +// pfSense API requires a follow-up Apply call to make the change live. +func (c *pfClient) UpdateGatewayIP(ctx context.Context, name, ip string) error { + body, err := json.Marshal(struct { + ID string `json:"id"` + Gateway string `json:"gateway"` + }{ID: name, Gateway: ip}) + if err != nil { + return fmt.Errorf("marshal: %w", err) + } + respBody, _, err := c.do(ctx, http.MethodPatch, "/api/v2/routing/gateway", + strings.NewReader(string(body))) + if err != nil { + return fmt.Errorf("pfsense PATCH gateway: %w", err) + } + return decodeEnvelope(respBody, new(any)) +} + +// Apply reloads the routing configuration so pending changes (e.g., +// from UpdateGatewayIP) become live. +func (c *pfClient) Apply(ctx context.Context) error { + respBody, _, err := c.do(ctx, http.MethodPost, "/api/v2/routing/apply", nil) + if err != nil { + return fmt.Errorf("pfsense POST apply: %w", err) + } + return decodeEnvelope(respBody, new(any)) +} + +// do issues an HTTP request, applies auth + JSON headers, returns the +// raw body and HTTP status. +func (c *pfClient) do(ctx context.Context, method, path string, body io.Reader) ([]byte, int, error) { + req, err := http.NewRequestWithContext(ctx, method, c.baseURL+path, body) + if err != nil { + return nil, 0, err + } + req.Header.Set(c.authHeader, c.apiKey) + if body != nil { + req.Header.Set("Content-Type", "application/json") + } + resp, err := c.http.Do(req) + if err != nil { + return nil, 0, err + } + defer func() { _ = resp.Body.Close() }() + b, err := io.ReadAll(resp.Body) + if err != nil { + return nil, resp.StatusCode, err + } + return b, resp.StatusCode, nil +} diff --git a/internal/pfsense/rest_test.go b/internal/pfsense/rest_test.go new file mode 100644 index 0000000..1daa943 --- /dev/null +++ b/internal/pfsense/rest_test.go @@ -0,0 +1,194 @@ +package pfsense + +import ( + "context" + "crypto/tls" + "encoding/json" + "errors" + "io" + "net/http" + "net/http/httptest" + "testing" +) + +// newTestServer + newTestClient give every test a fresh httptest +// server and a pf REST client wired to it. The handler is what the +// test customizes. +func newTestServer(t *testing.T, handler http.HandlerFunc) (*httptest.Server, *pfClient) { + t.Helper() + srv := httptest.NewTLSServer(handler) + t.Cleanup(srv.Close) + + // httptest.NewTLSServer uses a self-signed cert; the production + // client supports InsecureSkipVerify via Options.VerifyTLS=false. + c, err := New(Options{ + BaseURL: srv.URL, + APIKey: "test-key", + VerifyTLS: false, + }) + if err != nil { + t.Fatalf("New: %v", err) + } + return srv, c.(*pfClient) +} + +func TestDecodeEnvelope_Success(t *testing.T) { + body := `{"code":200,"status":"ok","response_id":"SUCCESS","message":"","data":{"name":"GW","gateway":"100.64.0.1"}}` + var into struct { + Name string `json:"name"` + Gateway string `json:"gateway"` + } + if err := decodeEnvelope([]byte(body), &into); err != nil { + t.Fatalf("decodeEnvelope: %v", err) + } + if into.Name != "GW" || into.Gateway != "100.64.0.1" { + t.Errorf("got %+v", into) + } +} + +func TestDecodeEnvelope_ErrorCode(t *testing.T) { + body := `{"code":404,"status":"error","response_id":"NOT_FOUND","message":"gateway 'X' not found","data":null}` + err := decodeEnvelope([]byte(body), new(any)) + if err == nil { + t.Fatalf("expected error, got nil") + } + var apiErr *APIError + if !errors.As(err, &apiErr) { + t.Fatalf("expected *APIError, got %T", err) + } + if apiErr.Code != 404 || apiErr.ResponseID != "NOT_FOUND" { + t.Errorf("got %+v", apiErr) + } +} + +func TestNewRequiresAPIKey(t *testing.T) { + _, err := New(Options{BaseURL: "https://example.com", APIKey: ""}) + if err == nil { + t.Errorf("expected error for empty APIKey") + } +} + +func TestGetGateway_Success(t *testing.T) { + var gotMethod, gotPath, gotAuth string + srv, c := newTestServer(t, func(w http.ResponseWriter, r *http.Request) { + gotMethod = r.Method + gotPath = r.URL.Path + "?" + r.URL.RawQuery + gotAuth = r.Header.Get("Authorization") + _, _ = w.Write([]byte(`{"code":200,"status":"ok","response_id":"SUCCESS","message":"","data":{"name":"GW","gateway":"100.64.0.1"}}`)) + }) + _ = srv + + gw, err := c.GetGateway(context.Background(), "GW") + if err != nil { + t.Fatalf("GetGateway: %v", err) + } + if gw.Name != "GW" || gw.IP != "100.64.0.1" { + t.Errorf("gw = %+v", gw) + } + if gotMethod != "GET" { + t.Errorf("method = %q, want GET", gotMethod) + } + if gotPath != "/api/v2/routing/gateway?id=GW" { + t.Errorf("path = %q, want /api/v2/routing/gateway?id=GW", gotPath) + } + if gotAuth != "test-key" { + t.Errorf("auth header = %q, want test-key", gotAuth) + } +} + +func TestGetGateway_NotFound(t *testing.T) { + _, c := newTestServer(t, func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusNotFound) + _, _ = w.Write([]byte(`{"code":404,"status":"error","response_id":"NOT_FOUND","message":"no such gw","data":null}`)) + }) + _, err := c.GetGateway(context.Background(), "missing") + var apiErr *APIError + if !errors.As(err, &apiErr) { + t.Fatalf("expected *APIError, got %T: %v", err, err) + } + if apiErr.Code != 404 { + t.Errorf("code = %d", apiErr.Code) + } +} + +func TestUpdateGatewayIP_Success(t *testing.T) { + var gotMethod, gotPath, gotBody string + _, c := newTestServer(t, func(w http.ResponseWriter, r *http.Request) { + gotMethod = r.Method + gotPath = r.URL.Path + b, _ := io.ReadAll(r.Body) + gotBody = string(b) + _, _ = w.Write([]byte(`{"code":200,"status":"ok","response_id":"SUCCESS","message":"","data":{}}`)) + }) + if err := c.UpdateGatewayIP(context.Background(), "GW", "100.64.0.99"); err != nil { + t.Fatalf("UpdateGatewayIP: %v", err) + } + if gotMethod != "PATCH" { + t.Errorf("method = %s", gotMethod) + } + if gotPath != "/api/v2/routing/gateway" { + t.Errorf("path = %s", gotPath) + } + // Body shape: {"id":"GW","gateway":"100.64.0.99"} + var parsed struct { + ID string `json:"id"` + Gateway string `json:"gateway"` + } + if err := json.Unmarshal([]byte(gotBody), &parsed); err != nil { + t.Fatalf("body json: %v", err) + } + if parsed.ID != "GW" || parsed.Gateway != "100.64.0.99" { + t.Errorf("body = %+v", parsed) + } +} + +func TestUpdateGatewayIP_ValidationError(t *testing.T) { + _, c := newTestServer(t, func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusBadRequest) + _, _ = w.Write([]byte(`{"code":400,"status":"error","response_id":"VALIDATION_FAILED","message":"bad ip","data":null}`)) + }) + err := c.UpdateGatewayIP(context.Background(), "GW", "not-an-ip") + if err == nil { + t.Fatalf("expected error") + } + var apiErr *APIError + if !errors.As(err, &apiErr) || apiErr.ResponseID != "VALIDATION_FAILED" { + t.Errorf("err = %v", err) + } +} + +func TestApply_Success(t *testing.T) { + var gotMethod, gotPath string + _, c := newTestServer(t, func(w http.ResponseWriter, r *http.Request) { + gotMethod = r.Method + gotPath = r.URL.Path + _, _ = w.Write([]byte(`{"code":200,"status":"ok","response_id":"SUCCESS","message":"applied","data":null}`)) + }) + if err := c.Apply(context.Background()); err != nil { + t.Fatalf("Apply: %v", err) + } + if gotMethod != "POST" { + t.Errorf("method = %s", gotMethod) + } + if gotPath != "/api/v2/routing/apply" { + t.Errorf("path = %s", gotPath) + } +} + +func TestApply_ServerError(t *testing.T) { + _, c := newTestServer(t, func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusInternalServerError) + _, _ = w.Write([]byte(`{"code":500,"status":"error","response_id":"INTERNAL","message":"oops","data":null}`)) + }) + if err := c.Apply(context.Background()); err == nil { + t.Errorf("expected error") + } +} + +// io is used here; ensure it's imported. +var _ = io.ReadAll + +// Silence unused-import warnings in early tasks; they're used by later tests. +var ( + _ = tls.Config{} +) diff --git a/internal/pfsense/types.go b/internal/pfsense/types.go new file mode 100644 index 0000000..ae819e9 --- /dev/null +++ b/internal/pfsense/types.go @@ -0,0 +1,9 @@ +// Package pfsense defines the pfSense client interface and shared types. +// The concrete community pfsense-api impl lands in Plan 2. +package pfsense + +// Gateway is the canonical pfSense gateway record. +type Gateway struct { + Name string + IP string +} diff --git a/internal/state/state.go b/internal/state/state.go new file mode 100644 index 0000000..96f1b0b --- /dev/null +++ b/internal/state/state.go @@ -0,0 +1,117 @@ +// Package state implements the on-disk cache for exit-node state. The file +// is treated as a best-effort cache; GCP labels + Tailscale tags are the +// source of truth. A POSIX file lock prevents concurrent rotates. +package state + +import ( + "encoding/json" + "errors" + "fmt" + "os" + "path/filepath" + + "github.com/gofrs/flock" + "github.com/iker/exit-node/internal/gcp" +) + +// ErrLocked is returned when another process holds the lock. +var ErrLocked = errors.New("state file already locked by another process") + +// Store is a flock-protected JSON cache for the current active exit node. +type Store struct { + path string + lock *flock.Flock +} + +// Open creates the parent directory if needed and acquires a non-blocking +// exclusive lock on the state file. The lock is released by Close. +func Open(path string) (*Store, error) { + if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil { + return nil, fmt.Errorf("mkdir state parent: %w", err) + } + l := flock.New(path + ".lock") + got, err := l.TryLock() + if err != nil { + return nil, fmt.Errorf("acquire state lock: %w", err) + } + if !got { + return nil, ErrLocked + } + return &Store{path: path, lock: l}, nil +} + +// Close releases the file lock. Idempotent. +func (s *Store) Close() error { + if s.lock == nil { + return nil + } + err := s.lock.Unlock() + s.lock = nil + return err +} + +type onDisk struct { + Active *gcp.ExitNode `json:"active,omitempty"` +} + +func (s *Store) read() (*onDisk, error) { + b, err := os.ReadFile(s.path) + if errors.Is(err, os.ErrNotExist) { + return &onDisk{}, nil + } + if err != nil { + return nil, fmt.Errorf("read state: %w", err) + } + if len(b) == 0 { + return &onDisk{}, nil + } + var d onDisk + if err := json.Unmarshal(b, &d); err != nil { + return nil, fmt.Errorf("parse state: %w", err) + } + return &d, nil +} + +func (s *Store) write(d *onDisk) error { + b, err := json.MarshalIndent(d, "", " ") + if err != nil { + return fmt.Errorf("marshal state: %w", err) + } + tmp := s.path + ".tmp" + if err := os.WriteFile(tmp, b, 0o600); err != nil { + return fmt.Errorf("write tmp state: %w", err) + } + if err := os.Rename(tmp, s.path); err != nil { + return fmt.Errorf("rename state: %w", err) + } + return nil +} + +// GetActive returns the cached active exit node, or nil if none recorded. +func (s *Store) GetActive() (*gcp.ExitNode, error) { + d, err := s.read() + if err != nil { + return nil, err + } + return d.Active, nil +} + +// SetActive records the given node as the active one. +func (s *Store) SetActive(n *gcp.ExitNode) error { + d, err := s.read() + if err != nil { + return err + } + d.Active = n + return s.write(d) +} + +// ClearActive removes the active-node record. +func (s *Store) ClearActive() error { + d, err := s.read() + if err != nil { + return err + } + d.Active = nil + return s.write(d) +} diff --git a/internal/state/state_test.go b/internal/state/state_test.go new file mode 100644 index 0000000..0ca7b5c --- /dev/null +++ b/internal/state/state_test.go @@ -0,0 +1,134 @@ +package state + +import ( + "errors" + "path/filepath" + "testing" + "time" + + "github.com/iker/exit-node/internal/gcp" +) + +func TestSaveLoadRoundtrip(t *testing.T) { + dir := t.TempDir() + path := filepath.Join(dir, "state.json") + + s, err := Open(path) + if err != nil { + t.Fatalf("Open: %v", err) + } + defer s.Close() + + active := &gcp.ExitNode{ + Name: "vpn-us-west1-a-xyz1", + Region: "us-west1", + Zone: "us-west1-a", + MachineType: "e2-micro", + PublicIP: "35.1.1.1", + TailscaleIP: "100.64.0.1", + DeviceID: "dev1", + State: gcp.StateRunning, + CreatedAt: time.Date(2026, 5, 12, 10, 0, 0, 0, time.UTC), + } + if err := s.SetActive(active); err != nil { + t.Fatalf("SetActive: %v", err) + } + if err := s.Close(); err != nil { + t.Fatalf("close first: %v", err) + } + + s2, err := Open(path) + if err != nil { + t.Fatalf("reopen: %v", err) + } + defer s2.Close() + + got, err := s2.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got == nil { + t.Fatalf("got nil active node, expected one") + } + if got.Name != active.Name { + t.Errorf("Name = %q, want %q", got.Name, active.Name) + } + if got.State != gcp.StateRunning { + t.Errorf("State = %v, want StateRunning", got.State) + } + if !got.CreatedAt.Equal(active.CreatedAt) { + t.Errorf("CreatedAt = %v, want %v", got.CreatedAt, active.CreatedAt) + } +} + +func TestGetActiveOnEmptyState(t *testing.T) { + dir := t.TempDir() + path := filepath.Join(dir, "state.json") + + s, err := Open(path) + if err != nil { + t.Fatalf("Open: %v", err) + } + defer s.Close() + + got, err := s.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got != nil { + t.Errorf("expected nil for empty state, got %+v", got) + } +} + +func TestClearActive(t *testing.T) { + dir := t.TempDir() + path := filepath.Join(dir, "state.json") + + s, err := Open(path) + if err != nil { + t.Fatalf("Open: %v", err) + } + defer s.Close() + + if err := s.SetActive(&gcp.ExitNode{Name: "x"}); err != nil { + t.Fatalf("SetActive: %v", err) + } + if err := s.ClearActive(); err != nil { + t.Fatalf("ClearActive: %v", err) + } + got, err := s.GetActive() + if err != nil { + t.Fatalf("GetActive: %v", err) + } + if got != nil { + t.Errorf("expected nil after Clear, got %+v", got) + } +} + +func TestFlockContention(t *testing.T) { + dir := t.TempDir() + path := filepath.Join(dir, "state.json") + + first, err := Open(path) + if err != nil { + t.Fatalf("first Open: %v", err) + } + defer first.Close() + + _, err = Open(path) + if !errors.Is(err, ErrLocked) { + t.Fatalf("second Open: got err=%v, want ErrLocked", err) + } + + // After releasing the first, a second Open succeeds. + if err := first.Close(); err != nil { + t.Fatalf("close first: %v", err) + } + second, err := Open(path) + if err != nil { + t.Fatalf("Open after release: %v", err) + } + if err := second.Close(); err != nil { + t.Fatalf("close second: %v", err) + } +} diff --git a/internal/tailscale/client.go b/internal/tailscale/client.go new file mode 100644 index 0000000..eb03a51 --- /dev/null +++ b/internal/tailscale/client.go @@ -0,0 +1,26 @@ +package tailscale + +import ( + "context" + "time" +) + +// TailscaleClient abstracts the Tailscale management API. +type TailscaleClient interface { + // MintEphemeralAuthKey returns a single-use, pre-authorized auth key + // tagged for the exit-node role. The key has a short TTL (~5 minutes). + MintEphemeralAuthKey(ctx context.Context, tags []string) (key string, err error) + + // WaitForDevice polls until a device with the given hostname registers. + // Returns the registered device or an error on timeout. + WaitForDevice(ctx context.Context, hostname string, timeout time.Duration) (*Device, error) + + // AuthorizeExitNode approves the device's exit-node advertisement. + AuthorizeExitNode(ctx context.Context, deviceID string) error + + // SetTags applies the tag set to the device. + SetTags(ctx context.Context, deviceID string, tags []string) error + + // DeleteDevice removes the device from the tailnet. + DeleteDevice(ctx context.Context, deviceID string) error +} diff --git a/internal/tailscale/types.go b/internal/tailscale/types.go new file mode 100644 index 0000000..d6e41b2 --- /dev/null +++ b/internal/tailscale/types.go @@ -0,0 +1,13 @@ +// Package tailscale defines the Tailscale client interface and shared +// types. The concrete OAuth client + ephemeral key minting impl lands in +// Plan 2. +package tailscale + +// Device is the canonical Tailscale device record. +type Device struct { + ID string + Hostname string + TailscaleIP string + Online bool + Tags []string +} diff --git a/internal/tailscale/v2client.go b/internal/tailscale/v2client.go new file mode 100644 index 0000000..0fce384 --- /dev/null +++ b/internal/tailscale/v2client.go @@ -0,0 +1,187 @@ +// Package tailscale's concrete TailscaleClient impl wraps +// tailscale.com/client/tailscale/v2. The wrapper is thin: it owns +// option validation, the AuthorizeExitNode composite call (which +// requires two underlying v2 calls), and WaitForDevice's polling loop. +package tailscale + +import ( + "context" + "errors" + "fmt" + "net/url" + "strings" + "time" + + tsv2 "tailscale.com/client/tailscale/v2" +) + +// Options configures the Tailscale client. +type Options struct { + // Tailnet is the organization name (the part before .ts.net or + // the configured custom domain). Required. + Tailnet string + // ClientID + ClientSecret are the OAuth client-credentials. The + // recommended scopes are "auth_keys" and "devices:core" (write). + // Fall back to "all:write" if scope naming has shifted on the + // admin console. + ClientID string + ClientSecret string + // BaseURL overrides the Tailscale API origin. Empty → use the + // library default (https://api.tailscale.com). Tests set this to + // an httptest server URL. + BaseURL string + // PollInterval is the WaitForDevice poll cadence. Defaults to 2s. + PollInterval time.Duration +} + +// tsClient implements TailscaleClient. +type tsClient struct { + inner *tsv2.Client + tailnet string + pollInterval time.Duration +} + +// New constructs a TailscaleClient. +func New(opts Options) (TailscaleClient, error) { + if strings.TrimSpace(opts.Tailnet) == "" { + return nil, errors.New("tailscale: Tailnet required") + } + if strings.TrimSpace(opts.ClientID) == "" { + return nil, errors.New("tailscale: ClientID required") + } + if strings.TrimSpace(opts.ClientSecret) == "" { + return nil, errors.New("tailscale: ClientSecret required") + } + c := &tsv2.Client{ + Tailnet: opts.Tailnet, + Auth: &tsv2.OAuth{ + ClientID: opts.ClientID, + ClientSecret: opts.ClientSecret, + Scopes: []string{"auth_keys", "devices:core"}, + }, + } + if opts.BaseURL != "" { + u, err := url.Parse(opts.BaseURL) + if err != nil { + return nil, fmt.Errorf("tailscale: parse BaseURL: %w", err) + } + c.BaseURL = u + } + poll := opts.PollInterval + if poll == 0 { + poll = 2 * time.Second + } + return &tsClient{inner: c, tailnet: opts.Tailnet, pollInterval: poll}, nil +} + +// MintEphemeralAuthKey mints a single-use, ephemeral, preauthorized +// auth key tagged for the given tags. The key has a 5-minute TTL. +func (c *tsClient) MintEphemeralAuthKey(ctx context.Context, tags []string) (string, error) { + req := tsv2.CreateKeyRequest{ + Description: "exit-node bootstrap", + ExpirySeconds: 300, + } + // The Capabilities shape uses anonymous nested structs in the v2 + // library. The construction below mirrors the library's struct + // literal pattern; field names match those in CreateKeyRequest. + req.Capabilities.Devices.Create.Reusable = false + req.Capabilities.Devices.Create.Ephemeral = true + req.Capabilities.Devices.Create.Preauthorized = true + req.Capabilities.Devices.Create.Tags = tags + + key, err := c.inner.Keys().CreateAuthKey(ctx, req) + if err != nil { + return "", fmt.Errorf("tailscale create auth key: %w", err) + } + return key.Key, nil +} + +// WaitForDevice polls the devices list until a device whose Hostname +// matches the given value appears, or until the timeout elapses. +// +// The v2 library's Device.Name is the FQDN (hostname plus tailnet +// suffix); some control-plane responses populate Name but not +// Hostname, so we accept either when matching. +func (c *tsClient) WaitForDevice(ctx context.Context, hostname string, timeout time.Duration) (*Device, error) { + deadline := time.Now().Add(timeout) + for { + devs, err := c.inner.Devices().List(ctx) + if err != nil { + return nil, fmt.Errorf("tailscale list devices: %w", err) + } + for _, d := range devs { + if d.Hostname == hostname { + return toDevice(d), nil + } + // Some v2 responses populate Name (FQDN) instead of + // Hostname; tolerate either. + if strings.HasPrefix(d.Name, hostname+".") { + return toDevice(d), nil + } + } + if time.Now().After(deadline) { + return nil, fmt.Errorf("tailscale: device %q did not register within %s", hostname, timeout) + } + select { + case <-ctx.Done(): + return nil, ctx.Err() + case <-time.After(c.pollInterval): + } + } +} + +// toDevice converts a v2 library Device to our internal Device type. +// +// The v2 library has no Online field; ConnectedToControl is the +// closest equivalent (true when the device currently holds an active +// control-plane connection). +func toDevice(d tsv2.Device) *Device { + out := &Device{ + ID: d.NodeID, + Hostname: d.Hostname, + Online: d.ConnectedToControl, + Tags: append([]string(nil), d.Tags...), + } + if out.ID == "" { + out.ID = d.ID + } + if len(d.Addresses) > 0 { + out.TailscaleIP = d.Addresses[0] + } + return out +} + +// AuthorizeExitNode performs two underlying operations: +// 1. SetAuthorized(true) — only meaningful if the tailnet requires +// manual device approval. With preauth keys this is typically a +// no-op (already authorized), but calling it is idempotent. +// 2. SetSubnetRoutes(["0.0.0.0/0", "::/0"]) — enables the exit-node +// advertisement. +func (c *tsClient) AuthorizeExitNode(ctx context.Context, deviceID string) error { + if err := c.inner.Devices().SetAuthorized(ctx, deviceID, true); err != nil { + return fmt.Errorf("tailscale set authorized: %w", err) + } + if err := c.inner.Devices().SetSubnetRoutes(ctx, deviceID, []string{"0.0.0.0/0", "::/0"}); err != nil { + return fmt.Errorf("tailscale set subnet routes: %w", err) + } + return nil +} + +// SetTags replaces the device's tag set. +func (c *tsClient) SetTags(ctx context.Context, deviceID string, tags []string) error { + if err := c.inner.Devices().SetTags(ctx, deviceID, tags); err != nil { + return fmt.Errorf("tailscale set tags: %w", err) + } + return nil +} + +// DeleteDevice removes the device from the tailnet. +func (c *tsClient) DeleteDevice(ctx context.Context, deviceID string) error { + if err := c.inner.Devices().Delete(ctx, deviceID); err != nil { + return fmt.Errorf("tailscale delete device: %w", err) + } + return nil +} + +// Compile-time assertion. +var _ TailscaleClient = (*tsClient)(nil) diff --git a/internal/tailscale/v2client_test.go b/internal/tailscale/v2client_test.go new file mode 100644 index 0000000..fac760e --- /dev/null +++ b/internal/tailscale/v2client_test.go @@ -0,0 +1,258 @@ +package tailscale + +import ( + "context" + "encoding/json" + "net/http" + "net/http/httptest" + "strings" + "sync/atomic" + "testing" + "time" +) + +// tokenIssuer is the standard OAuth client-credentials endpoint stub. +// Every test server mux-routes /api/v2/oauth/token to this handler. +func tokenIssuer(w http.ResponseWriter, r *http.Request) { + _ = r.ParseForm() + // Don't bother validating client_id/secret here — that's the + // Tailscale library's job. Return a valid token response. + w.Header().Set("Content-Type", "application/json") + _ = json.NewEncoder(w).Encode(map[string]any{ + "access_token": "fake-token", + "token_type": "Bearer", + "expires_in": 3600, + }) +} + +// newTestClient wires a tsClient to an httptest server. Tests provide +// the mux; tokenIssuer is registered for /api/v2/oauth/token here so +// every test gets OAuth for free. +func newTestClient(t *testing.T, mux *http.ServeMux) (*httptest.Server, *tsClient) { + t.Helper() + mux.HandleFunc("/api/v2/oauth/token", tokenIssuer) + srv := httptest.NewServer(mux) + t.Cleanup(srv.Close) + + c, err := New(Options{ + Tailnet: "test.example.com", + ClientID: "test-id", + ClientSecret: "test-secret", + BaseURL: srv.URL, + }) + if err != nil { + t.Fatalf("New: %v", err) + } + return srv, c.(*tsClient) +} + +func TestNewRequiresCredentials(t *testing.T) { + cases := []struct { + name string + opts Options + }{ + {"missing tailnet", Options{ClientID: "x", ClientSecret: "y"}}, + {"missing client id", Options{Tailnet: "x", ClientSecret: "y"}}, + {"missing client secret", Options{Tailnet: "x", ClientID: "y"}}, + } + for _, tc := range cases { + t.Run(tc.name, func(t *testing.T) { + if _, err := New(tc.opts); err == nil { + t.Errorf("expected error") + } + }) + } +} + +func TestMintEphemeralAuthKey_Success(t *testing.T) { + var gotMethod, gotPath, gotAuth string + var gotBody map[string]any + mux := http.NewServeMux() + mux.HandleFunc("/api/v2/tailnet/test.example.com/keys", + func(w http.ResponseWriter, r *http.Request) { + gotMethod = r.Method + gotPath = r.URL.Path + gotAuth = r.Header.Get("Authorization") + _ = json.NewDecoder(r.Body).Decode(&gotBody) + _ = json.NewEncoder(w).Encode(map[string]any{ + "id": "key-id-1", + "key": "tskey-auth-xxxxxx", + }) + }) + + _, c := newTestClient(t, mux) + got, err := c.MintEphemeralAuthKey(context.Background(), []string{"tag:exit-node"}) + if err != nil { + t.Fatalf("MintEphemeralAuthKey: %v", err) + } + if got != "tskey-auth-xxxxxx" { + t.Errorf("key = %q", got) + } + if gotMethod != "POST" { + t.Errorf("method = %s", gotMethod) + } + if gotPath != "/api/v2/tailnet/test.example.com/keys" { + t.Errorf("path = %s", gotPath) + } + if !strings.HasPrefix(gotAuth, "Bearer ") { + t.Errorf("auth header = %q, want Bearer prefix", gotAuth) + } + + // Body shape — drill into capabilities.devices.create: + caps, _ := gotBody["capabilities"].(map[string]any) + devs, _ := caps["devices"].(map[string]any) + create, _ := devs["create"].(map[string]any) + if v, _ := create["ephemeral"].(bool); !v { + t.Errorf("ephemeral != true (body=%v)", gotBody) + } + if v, _ := create["preauthorized"].(bool); !v { + t.Errorf("preauthorized != true") + } + if v, _ := create["reusable"].(bool); v { + t.Errorf("reusable should be false") + } + tags, _ := create["tags"].([]any) + if len(tags) != 1 || tags[0] != "tag:exit-node" { + t.Errorf("tags = %v", tags) + } + if exp, _ := gotBody["expirySeconds"].(float64); exp != 300 { + t.Errorf("expirySeconds = %v, want 300", exp) + } +} + +func TestMintEphemeralAuthKey_APIError(t *testing.T) { + mux := http.NewServeMux() + mux.HandleFunc("/api/v2/tailnet/test.example.com/keys", + func(w http.ResponseWriter, r *http.Request) { + w.WriteHeader(http.StatusUnauthorized) + _, _ = w.Write([]byte(`{"message":"bad scope"}`)) + }) + _, c := newTestClient(t, mux) + if _, err := c.MintEphemeralAuthKey(context.Background(), nil); err == nil { + t.Errorf("expected error") + } +} + +func TestWaitForDevice_FindsAfterDelay(t *testing.T) { + var listCalls int32 + mux := http.NewServeMux() + mux.HandleFunc("/api/v2/tailnet/test.example.com/devices", + func(w http.ResponseWriter, r *http.Request) { + n := atomic.AddInt32(&listCalls, 1) + devices := []map[string]any{} + if n >= 2 { // appear on second poll + devices = []map[string]any{{ + "nodeId": "node-1", + "id": "id-1", + "name": "vpn-us-west1-abc.test.example.com", + "hostname": "vpn-us-west1-abc", + "addresses": []string{"100.64.0.9"}, + }} + } + _ = json.NewEncoder(w).Encode(map[string]any{"devices": devices}) + }) + _, c := newTestClient(t, mux) + c.pollInterval = 10 * time.Millisecond // fast poll for tests + + dev, err := c.WaitForDevice(context.Background(), "vpn-us-west1-abc", 2*time.Second) + if err != nil { + t.Fatalf("WaitForDevice: %v", err) + } + if dev == nil || dev.Hostname != "vpn-us-west1-abc" { + t.Errorf("dev = %+v", dev) + } + if dev.TailscaleIP != "100.64.0.9" { + t.Errorf("TailscaleIP = %q", dev.TailscaleIP) + } + if atomic.LoadInt32(&listCalls) < 2 { + t.Errorf("expected >=2 list calls, got %d", listCalls) + } +} + +func TestWaitForDevice_Timeout(t *testing.T) { + mux := http.NewServeMux() + mux.HandleFunc("/api/v2/tailnet/test.example.com/devices", + func(w http.ResponseWriter, r *http.Request) { + _ = json.NewEncoder(w).Encode(map[string]any{"devices": []any{}}) + }) + _, c := newTestClient(t, mux) + c.pollInterval = 5 * time.Millisecond + + _, err := c.WaitForDevice(context.Background(), "missing", 50*time.Millisecond) + if err == nil { + t.Errorf("expected timeout error") + } +} + +func TestAuthorizeExitNode_CallsBothEndpoints(t *testing.T) { + var setAuthorizedCalled, setRoutesCalled bool + var routesBody map[string]any + + mux := http.NewServeMux() + mux.HandleFunc("/api/v2/device/node-1/authorized", + func(w http.ResponseWriter, r *http.Request) { + setAuthorizedCalled = true + w.WriteHeader(http.StatusOK) + }) + mux.HandleFunc("/api/v2/device/node-1/routes", + func(w http.ResponseWriter, r *http.Request) { + setRoutesCalled = true + _ = json.NewDecoder(r.Body).Decode(&routesBody) + _ = json.NewEncoder(w).Encode(map[string]any{ + "enabledRoutes": []string{"0.0.0.0/0", "::/0"}, + "advertisedRoutes": []string{"0.0.0.0/0", "::/0"}, + }) + }) + + _, c := newTestClient(t, mux) + if err := c.AuthorizeExitNode(context.Background(), "node-1"); err != nil { + t.Fatalf("AuthorizeExitNode: %v", err) + } + if !setAuthorizedCalled { + t.Errorf("expected /authorized to be called") + } + if !setRoutesCalled { + t.Errorf("expected /routes to be called") + } + routes, _ := routesBody["routes"].([]any) + if len(routes) != 2 { + t.Errorf("routes = %v", routes) + } +} + +func TestSetTags_Success(t *testing.T) { + var got map[string]any + mux := http.NewServeMux() + mux.HandleFunc("/api/v2/device/node-1/tags", + func(w http.ResponseWriter, r *http.Request) { + _ = json.NewDecoder(r.Body).Decode(&got) + w.WriteHeader(http.StatusOK) + }) + _, c := newTestClient(t, mux) + if err := c.SetTags(context.Background(), "node-1", []string{"tag:exit-node", "tag:home"}); err != nil { + t.Fatalf("SetTags: %v", err) + } + tags, _ := got["tags"].([]any) + if len(tags) != 2 { + t.Errorf("tags = %v", tags) + } +} + +func TestDeleteDevice_Success(t *testing.T) { + var deleted bool + mux := http.NewServeMux() + mux.HandleFunc("/api/v2/device/node-1", + func(w http.ResponseWriter, r *http.Request) { + if r.Method == http.MethodDelete { + deleted = true + w.WriteHeader(http.StatusOK) + } + }) + _, c := newTestClient(t, mux) + if err := c.DeleteDevice(context.Background(), "node-1"); err != nil { + t.Fatalf("DeleteDevice: %v", err) + } + if !deleted { + t.Errorf("expected DELETE /api/v2/device/node-1") + } +} diff --git a/internal/verify/probe.go b/internal/verify/probe.go new file mode 100644 index 0000000..d2d6abb --- /dev/null +++ b/internal/verify/probe.go @@ -0,0 +1,20 @@ +// Package verify defines the Probe interface. The concrete shellout impl +// (sets tailscale exit-node, curls, restores) lands in Plan 2. +package verify + +import "context" + +// Probe verifies egress routing from the orchestrator host. +type Probe interface { + // EgressVia temporarily routes the orchestrator host's egress through + // the given tailscale IP, curls an IP-echo service, restores the prior + // exit-node setting, and returns the observed egress IP. The restore + // runs in a defer and executes even on probe failure. + EgressVia(ctx context.Context, tailscaleIP string) (egressIP string, err error) + + // EgressDirect curls the IP-echo service with no tailscale exit-node + // override (or temporarily clears it), then restores. Used for the + // post-cutover check that traffic flows via the orchestrator's default + // route (LAN → pfSense → new exit node). + EgressDirect(ctx context.Context) (egressIP string, err error) +} diff --git a/internal/verify/shell.go b/internal/verify/shell.go new file mode 100644 index 0000000..1558b54 --- /dev/null +++ b/internal/verify/shell.go @@ -0,0 +1,138 @@ +// Package verify implements the local-tailnet Probe interface by shelling +// out to `tailscale` and `curl`. The exec layer is abstracted as a +// commandRunner so tests can substitute a fake without touching real +// binaries. +package verify + +import ( + "bytes" + "context" + "encoding/json" + "errors" + "fmt" + "os/exec" + "strings" +) + +// commandRunner abstracts process execution so tests can substitute a +// fake without touching real binaries. The production implementation +// (osCmdRunner) shells out via os/exec. +type commandRunner interface { + Run(ctx context.Context, name string, args ...string) (stdout string, err error) +} + +// osCmdRunner is the production runner. Its Run shells out to the given +// binary on PATH; stderr is folded into the returned error on non-zero +// exit so tests of error paths see the underlying message. +type osCmdRunner struct{} + +func (osCmdRunner) Run(ctx context.Context, name string, args ...string) (string, error) { + cmd := exec.CommandContext(ctx, name, args...) + var stdout, stderr bytes.Buffer + cmd.Stdout = &stdout + cmd.Stderr = &stderr + if err := cmd.Run(); err != nil { + if stderr.Len() > 0 { + return stdout.String(), errors.New(stderr.String()) + } + return stdout.String(), err + } + return stdout.String(), nil +} + +// New constructs the production Probe (shells out to tailscale + curl). +func New(probeURL string) Probe { + return &shellProbe{run: osCmdRunner{}, probeURL: probeURL} +} + +// shellProbe is the concrete Probe implementation. It is unexported; the +// returned interface is the only public surface. +type shellProbe struct { + run commandRunner + probeURL string +} + +// EgressVia routes the orchestrator host's egress through the given +// Tailscale IP, curls the configured probe URL, restores the prior +// exit-node setting (always, even on probe failure), and returns the +// observed egress IP. +func (p *shellProbe) EgressVia(ctx context.Context, tailscaleIP string) (string, error) { + priorID, err := p.captureExitNodeID(ctx) + if err != nil { + return "", fmt.Errorf("capture prior exit-node: %w", err) + } + // Restore runs in a defer so it executes on ANY return path below. + defer p.restoreExitNode(priorID) + + if _, err := p.run.Run(ctx, "tailscale", "set", + fmt.Sprintf("--exit-node=%s", tailscaleIP), + "--exit-node-allow-lan-access=true", + ); err != nil { + return "", fmt.Errorf("set exit-node: %w", err) + } + if _, err := p.run.Run(ctx, "tailscale", "ping", "--timeout=10s", tailscaleIP); err != nil { + return "", fmt.Errorf("tailscale ping: %w", err) + } + out, err := p.run.Run(ctx, "curl", "--silent", "--max-time", "10", p.probeURL) + if err != nil { + return "", fmt.Errorf("curl probe URL: %w", err) + } + return strings.TrimSpace(out), nil +} + +// captureExitNodeID parses `tailscale status --json` and returns the +// current ExitNodeStatus.ID (empty string if no exit node was set). +func (p *shellProbe) captureExitNodeID(ctx context.Context) (string, error) { + out, err := p.run.Run(ctx, "tailscale", "status", "--json") + if err != nil { + return "", err + } + var parsed struct { + ExitNodeStatus *struct { + ID string `json:"ID"` + } `json:"ExitNodeStatus"` + } + if err := json.Unmarshal([]byte(out), &parsed); err != nil { + return "", fmt.Errorf("parse tailscale status json: %w", err) + } + if parsed.ExitNodeStatus == nil { + return "", nil + } + return parsed.ExitNodeStatus.ID, nil +} + +// EgressDirect curls the probe URL with no Tailscale exit-node override, +// then restores the prior exit-node setting. Used for the post-cutover +// check that traffic flows via the host's default route (LAN → pfSense → +// new exit node). +func (p *shellProbe) EgressDirect(ctx context.Context) (string, error) { + priorID, err := p.captureExitNodeID(ctx) + if err != nil { + return "", fmt.Errorf("capture prior exit-node: %w", err) + } + defer p.restoreExitNode(priorID) + + if _, err := p.run.Run(ctx, "tailscale", "set", "--exit-node="); err != nil { + return "", fmt.Errorf("clear exit-node: %w", err) + } + out, err := p.run.Run(ctx, "curl", "--silent", "--max-time", "10", p.probeURL) + if err != nil { + return "", fmt.Errorf("curl probe URL: %w", err) + } + return strings.TrimSpace(out), nil +} + +// restoreExitNode is best-effort; errors are intentionally swallowed +// because we're already in a defer chain and the caller has its own +// error to return. A failed restore is loud at the host level (you'll +// notice your egress is wrong); this is documented in the README's +// troubleshooting section. +func (p *shellProbe) restoreExitNode(priorID string) { + // Use a fresh context: the request ctx may already be canceled. + ctx := context.Background() + arg := "--exit-node=" + if priorID != "" { + arg = "--exit-node=" + priorID + } + _, _ = p.run.Run(ctx, "tailscale", "set", arg) +} diff --git a/internal/verify/shell_test.go b/internal/verify/shell_test.go new file mode 100644 index 0000000..ed5cd8d --- /dev/null +++ b/internal/verify/shell_test.go @@ -0,0 +1,209 @@ +package verify + +import ( + "context" + "errors" + "strings" + "testing" +) + +// fakeRunner records every command and returns canned outputs / errors +// per call. Tests configure Responses in order; the i-th Run call +// returns Responses[i]. +type fakeRunner struct { + calls []fakeCall + Responses []fakeResponse +} + +type fakeCall struct { + Name string + Args []string +} + +type fakeResponse struct { + Stdout string + Err error +} + +func (f *fakeRunner) Run(ctx context.Context, name string, args ...string) (string, error) { + i := len(f.calls) + f.calls = append(f.calls, fakeCall{Name: name, Args: args}) + if i >= len(f.Responses) { + return "", errors.New("fakeRunner: unexpected extra call") + } + r := f.Responses[i] + return r.Stdout, r.Err +} + +func (f *fakeRunner) lastNCommands(n int) []string { + out := make([]string, 0, n) + start := len(f.calls) - n + if start < 0 { + start = 0 + } + for _, c := range f.calls[start:] { + out = append(out, c.Name+" "+strings.Join(c.Args, " ")) + } + return out +} + +func TestShellRunnerInterface(t *testing.T) { + // Sentinel test — confirms commandRunner is the seam and *fakeRunner + // implements it. Compile-only assertion. + var _ commandRunner = (*fakeRunner)(nil) +} + +func TestEgressVia_HappyPath_RestoresPrior(t *testing.T) { + statusJSON := `{"ExitNodeStatus":{"ID":"prior-node-id"}}` + fake := &fakeRunner{ + Responses: []fakeResponse{ + {Stdout: statusJSON, Err: nil}, // tailscale status --json + {Stdout: "", Err: nil}, // tailscale set --exit-node= + {Stdout: "pong\n", Err: nil}, // tailscale ping + {Stdout: "203.0.113.7\n", Err: nil}, // curl + {Stdout: "", Err: nil}, // tailscale set --exit-node=prior-node-id (defer) + }, + } + p := &shellProbe{run: fake, probeURL: "https://example.com/ip"} + + got, err := p.EgressVia(context.Background(), "100.64.0.9") + if err != nil { + t.Fatalf("EgressVia: %v", err) + } + if got != "203.0.113.7" { + t.Errorf("egress = %q, want 203.0.113.7", got) + } + + if len(fake.calls) != 5 { + t.Fatalf("expected 5 commands, got %d: %v", len(fake.calls), fake.lastNCommands(len(fake.calls))) + } + // The fifth call must be the restore to the prior ID. + got5 := fake.calls[4] + if got5.Name != "tailscale" || !contains(got5.Args, "--exit-node=prior-node-id") { + t.Errorf("expected restore to prior id, got %s %v", got5.Name, got5.Args) + } +} + +// contains reports whether needle is in haystack. +func contains(haystack []string, needle string) bool { + for _, s := range haystack { + if s == needle { + return true + } + } + return false +} + +func TestEgressVia_RestoreRunsOnFailure(t *testing.T) { + statusJSON := `{"ExitNodeStatus":{"ID":"prior-node-id"}}` + + cases := []struct { + name string + // Responses: status, set, ping, curl — index of which one to fail. + failAt int + wantErrSubstr string + }{ + {name: "set fails", failAt: 1, wantErrSubstr: "set exit-node"}, + {name: "ping fails", failAt: 2, wantErrSubstr: "tailscale ping"}, + {name: "curl fails", failAt: 3, wantErrSubstr: "curl probe URL"}, + } + for _, tc := range cases { + t.Run(tc.name, func(t *testing.T) { + responses := []fakeResponse{ + {Stdout: statusJSON, Err: nil}, // status + {Stdout: "", Err: nil}, // set + {Stdout: "pong\n", Err: nil}, // ping + {Stdout: "1.2.3.4\n", Err: nil}, // curl + } + responses[tc.failAt] = fakeResponse{Err: errors.New("boom")} + // Always one extra response for the restore. + responses = append(responses, fakeResponse{}) + + fake := &fakeRunner{Responses: responses} + p := &shellProbe{run: fake, probeURL: "https://x/ip"} + + _, err := p.EgressVia(context.Background(), "100.64.0.9") + if err == nil { + t.Fatalf("expected error, got nil") + } + if !strings.Contains(err.Error(), tc.wantErrSubstr) { + t.Errorf("err = %q, want substring %q", err.Error(), tc.wantErrSubstr) + } + + // The LAST call must be the restore. + last := fake.calls[len(fake.calls)-1] + if last.Name != "tailscale" || !contains(last.Args, "--exit-node=prior-node-id") { + t.Errorf("expected last call to be restore; got %s %v", last.Name, last.Args) + } + }) + } +} + +func TestEgressVia_RestoresEmptyWhenNoPriorExitNode(t *testing.T) { + // ExitNodeStatus absent in JSON → restore arg is bare "--exit-node=" + fake := &fakeRunner{ + Responses: []fakeResponse{ + {Stdout: `{}`, Err: nil}, // status: no ExitNodeStatus + {Stdout: "", Err: nil}, // set + {Stdout: "pong\n", Err: nil}, // ping + {Stdout: "1.2.3.4\n", Err: nil}, // curl + {Stdout: "", Err: nil}, // restore + }, + } + p := &shellProbe{run: fake, probeURL: "https://x/ip"} + if _, err := p.EgressVia(context.Background(), "100.64.0.9"); err != nil { + t.Fatalf("EgressVia: %v", err) + } + last := fake.calls[len(fake.calls)-1] + if last.Name != "tailscale" || !contains(last.Args, "--exit-node=") { + t.Errorf("expected restore with empty exit-node, got %s %v", last.Name, last.Args) + } +} + +func TestEgressDirect_HappyPath_RestoresPrior(t *testing.T) { + statusJSON := `{"ExitNodeStatus":{"ID":"prior-node-id"}}` + fake := &fakeRunner{ + Responses: []fakeResponse{ + {Stdout: statusJSON}, // status + {Stdout: ""}, // set --exit-node= (clear) + {Stdout: "203.0.113.99\n"}, // curl + {Stdout: ""}, // restore + }, + } + p := &shellProbe{run: fake, probeURL: "https://x/ip"} + got, err := p.EgressDirect(context.Background()) + if err != nil { + t.Fatalf("EgressDirect: %v", err) + } + if got != "203.0.113.99" { + t.Errorf("egress = %q", got) + } + // 2nd call clears, 4th call restores. + if got, want := fake.calls[1].Args, []string{"set", "--exit-node="}; !equalSlices(got, want) { + t.Errorf("clear call = %v, want %v", got, want) + } + if last := fake.calls[3]; !contains(last.Args, "--exit-node=prior-node-id") { + t.Errorf("restore call = %v", last) + } +} + +func equalSlices(a, b []string) bool { + if len(a) != len(b) { + return false + } + for i := range a { + if a[i] != b[i] { + return false + } + } + return true +} + +func TestNewReturnsProbe(t *testing.T) { + var _ Probe = (*shellProbe)(nil) // compile-time interface check + + p := New("https://example.com/ip") + if p == nil { + t.Fatalf("New returned nil") + } +} diff --git a/scripts/install.sh b/scripts/install.sh new file mode 100755 index 0000000..bcab0c1 --- /dev/null +++ b/scripts/install.sh @@ -0,0 +1,54 @@ +#!/bin/bash +# +# exitnode bootstrap script. Fetched at first boot via the GCP startup +# script (instance metadata key `startup-script-url`). Idempotent — +# safe to re-run. +# +# Reads required parameters from VM instance metadata: +# - tailscale-auth-key (ephemeral, single-use, ~5m TTL) +# - tailscale-hostname (vpn--) +# - tailscale-tags (comma-separated, e.g. "tag:exit-node") +# +set -euo pipefail + +META="http://metadata.google.internal/computeMetadata/v1/instance/attributes" + +get_metadata() { + curl --silent --show-error --fail \ + --header "Metadata-Flavor: Google" \ + "${META}/$1" +} + +AUTH_KEY="$(get_metadata tailscale-auth-key)" +HOSTNAME_VAL="$(get_metadata tailscale-hostname)" +TAGS="$(get_metadata tailscale-tags)" + +# Validate — fail loudly if any required key is missing. +: "${AUTH_KEY:?tailscale-auth-key metadata missing}" +: "${HOSTNAME_VAL:?tailscale-hostname metadata missing}" +: "${TAGS:?tailscale-tags metadata missing}" + +apt-get update +apt-get install -y curl + +# Tailscale via official installer (handles repo + key + apt install). +if ! command -v tailscale >/dev/null 2>&1; then + curl -fsSL https://tailscale.com/install.sh | sh +fi + +# IP forwarding — idempotent drop-in; do NOT edit /etc/sysctl.conf. +cat >/etc/sysctl.d/99-tailscale.conf <