feat(cli): break-glass emergency console TUI

Add `felis breakGlass`, a root-only interactive TUI that provisions or resets the Owner account directly against Postgres and enables local password login. It is the local-root recovery path that bypasses web Zero Trust by design - used to bootstrap the first Owner credential and to recover when the web login is unreachable. - Bare `felis` prints CLI usage only; breakGlass is the sole subcommand that enters a TUI rather than running as a CLI. - Refuses to run unless euid is 0 (try: sudo felis breakGlass); on non-Unix platforms the euid check also refuses. - Generates a one-time Owner password, sets must_change_password, and prints a durable summary (username, one-time password, op.console login URL derived from the configured root domain) after the alt-screen TUI is torn down. Covered by Go unit tests over a fake owner store.
2026-06-27 04:23:21 +09:00
1 parent af14f02f38
commit e108a3709a
@@ -0,0 +1,425 @@
+package main
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"felis.lolicon.best/internal/api"
+	"felis.lolicon.best/internal/config"
+	"felis.lolicon.best/internal/store"
+
+	"github.com/charmbracelet/bubbles/textinput"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+	"golang.org/x/crypto/bcrypt"
+)
+
+// `felis breakGlass` is the local break-glass emergency console (spec §B). Its
+// authority is local root, so it legitimately BYPASSES the web Zero-Trust + Passkey
+// path: critical recovery runs direct-to-Postgres. The thin-thread operation it
+// ships here is the one that bootstraps everything else — provision (or reset) the
+// single Owner account and turn local-password login on — so that even with the web
+// auth path unconfigured an operator can get into op.console. It is a genuine
+// interactive TUI, NOT a CLI: bare `felis` prints CLI usage, while `felis breakGlass`
+// opens this full-screen console. It refuses to run unless euid is 0 (sudo/root).
+//
+// The richer break-glass operations (OP create, halt, sync, S3) land in a later
+// phase; this file is intentionally scoped to the one provisioning operation that
+// makes the local-auth thin thread reachable.
+
+// localAuthEnabledSettingKey is the platform_settings key the live API reads to
+// decide whether local-password sessions are honored. It MUST match the
+// (unexported) localAuthEnabledKey the api package consults per-request; the VM
+// smoke test (login after break-glass) is what guarantees they stay in sync.
+const localAuthEnabledSettingKey = "local_auth_enabled"
+
+// bootstrapPasswordAlphabet excludes visually ambiguous glyphs (0/O, 1/I/l) so a
+// human can transcribe the one-time password off a terminal without error.
+const bootstrapPasswordAlphabet = "ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz23456789"
+
+// ownerStore is the minimal repo surface break-glass provisioning needs.
+// *api.PGRepo satisfies it; the unit tests drive a fake, so the core provisioning
+// logic is exercised without a database or a terminal.
+type ownerStore interface {
+	UpsertOwner(ctx context.Context, id, username, email, passwordHash string, mustChange bool) error
+	SetSetting(ctx context.Context, key string, value []byte) error
+}
+
+// cmdBreakGlass is the `felis breakGlass` entrypoint: the root gate, config load,
+// database open, and the interactive TUI. Everything below runBreakGlassTUI is
+// I/O at the edge; the provisioning logic itself is plain functions over
+// ownerStore so it stays testable off a terminal.
+func cmdBreakGlass(args []string, stdout, stderr io.Writer) int {
+	fs := flag.NewFlagSet("breakGlass", flag.ContinueOnError)
+	fs.SetOutput(stderr)
+	cfgPath := fs.String("config", "/etc/felis/felis.toml", "path to felis.toml")
+	if err := fs.Parse(args); err != nil {
+		return 2
+	}
+
+	// Root gate. The break-glass console's whole authority model is "you already
+	// have local root", so anything less is refused rather than degraded. On
+	// non-Unix os.Geteuid() returns -1, which also refuses — correct, since this is
+	// a Linux-VM recovery tool.
+	if os.Geteuid() != 0 {
+		fmt.Fprintln(stderr, "felis breakGlass: refused — the break-glass emergency console must run as root (try: sudo felis breakGlass)")
+		return 1
+	}
+
+	cfg, err := config.Load(*cfgPath)
+	if err != nil {
+		fmt.Fprintf(stderr, "felis breakGlass: %v\n", err)
+		return 1
+	}
+
+	ctx := context.Background()
+	drv, err := store.Open(ctx, cfg.Database.URL)
+	if err != nil {
+		fmt.Fprintf(stderr, "felis breakGlass: open database: %v\n", err)
+		return 1
+	}
+	defer drv.Close()
+
+	repo := api.NewPGRepo(drv.DB())
+	res, err := runBreakGlassTUI(ctx, repo, cfg.Server.RootDomain)
+	if err != nil {
+		fmt.Fprintf(stderr, "felis breakGlass: %v\n", err)
+		return 1
+	}
+
+	if !res.provisioned {
+		fmt.Fprintln(stdout, "felis breakGlass: cancelled — no changes made.")
+		return 0
+	}
+
+	// The TUI runs on the alternate screen, which is torn down on exit and takes the
+	// in-console password display with it. Re-print a durable summary to the normal
+	// screen so the one-time bootstrap password survives in scrollback long enough
+	// for the operator to log in. It is shown, never persisted: only the bcrypt hash
+	// reached the database.
+	fmt.Fprintf(stdout, "\nfelis breakGlass: Owner account %q provisioned; local-password login is ENABLED.\n", res.username)
+	fmt.Fprintf(stdout, "One-time bootstrap password (you MUST change it on first login):\n\n    %s\n\n", res.password)
+	if res.rootDomain != "" {
+		fmt.Fprintf(stdout, "Log in at https://op.console.%s with that username and password.\n", res.rootDomain)
+	}
+	return 0
+}
+
+// newOwnerID returns a fresh, unguessable id for the Owner row. It mirrors the
+// crypto/rand hex idiom used elsewhere (internal/submit, internal/build): 16 bytes
+// give uuid-equivalent entropy and the value is path/argv-safe lowercase hex. A
+// fresh id per run is fine because UpsertOwner preserves the existing id on a
+// username conflict, so a reset keeps live sessions valid.
+func newOwnerID() string {
+	var b [16]byte
+	if _, err := rand.Read(b[:]); err != nil {
+		// crypto/rand only fails on a broken entropy source. Refuse rather than mint a
+		// predictable id for a privileged account.
+		return ""
+	}
+	return "usr-" + hex.EncodeToString(b[:])
+}
+
+// generateBootstrapPassword returns a fresh one-time password from the unambiguous
+// alphabet. It rejection-samples to avoid modulo bias, so every position is uniform
+// over the alphabet. 20 chars over a 57-symbol alphabet is ~116 bits — far more than
+// the must-change credential needs, and it is rotated on first login regardless.
+func generateBootstrapPassword() (string, error) {
+	const n = 20
+	// Largest multiple of the alphabet size that fits in a byte; bytes at or above it
+	// are discarded so the surviving values map uniformly (no modulo bias).
+	limit := byte(256 - (256 % len(bootstrapPasswordAlphabet)))
+	out := make([]byte, 0, n)
+	var b [1]byte
+	for len(out) < n {
+		if _, err := rand.Read(b[:]); err != nil {
+			return "", fmt.Errorf("generate bootstrap password: %w", err)
+		}
+		if b[0] >= limit {
+			continue
+		}
+		out = append(out, bootstrapPasswordAlphabet[int(b[0])%len(bootstrapPasswordAlphabet)])
+	}
+	return string(out), nil
+}
+
+// provisionOwner mints or resets the single Owner account direct-to-Postgres and
+// returns the one-time bootstrap password to display. The account is created with
+// must_change_password=true, which is load-bearing: it is what arms the API's
+// lockdown middleware so the Owner can do nothing but change the password on first
+// login. The returned plaintext exists ONLY to be shown once on this terminal — it
+// is never logged or persisted; only its bcrypt hash reaches the database.
+func provisionOwner(ctx context.Context, s ownerStore, username, email string) (string, error) {
+	username = strings.TrimSpace(username)
+	if username == "" {
+		return "", errors.New("username is required")
+	}
+	id := newOwnerID()
+	if id == "" {
+		return "", errors.New("generate owner id: entropy source failed")
+	}
+	password, err := generateBootstrapPassword()
+	if err != nil {
+		return "", err
+	}
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return "", fmt.Errorf("hash bootstrap password: %w", err)
+	}
+	if err := s.UpsertOwner(ctx, id, username, strings.TrimSpace(email), string(hash), true); err != nil {
+		return "", fmt.Errorf("write owner: %w", err)
+	}
+	return password, nil
+}
+
+// enableLocalAuth flips the runtime local_auth_enabled toggle on
+// direct-to-Postgres. It is the second load-bearing write of break-glass: without
+// it handleLogin returns 403 and the freshly provisioned Owner cannot log in, so a
+// successful provisionOwner with local auth off is not a usable thin thread.
+func enableLocalAuth(ctx context.Context, s ownerStore) error {
+	// The setting is read back with json.Unmarshal into a bool, so the stored jsonb
+	// value must be the literal true.
+	if err := s.SetSetting(ctx, localAuthEnabledSettingKey, []byte("true")); err != nil {
+		return fmt.Errorf("enable local auth: %w", err)
+	}
+	return nil
+}
+
+// ---- interactive TUI (the untested shell over the tested core) ----
+
+// breakGlassResult is what the TUI hands back to cmdBreakGlass for the durable
+// post-exit summary. provisioned is false on cancel.
+type breakGlassResult struct {
+	provisioned bool
+	username    string
+	password    string
+	rootDomain  string
+}
+
+type bgState int
+
+const (
+	stateForm bgState = iota
+	stateWorking
+	stateDone
+	stateError
+)
+
+// provisionedMsg is delivered to the model when the background provisioning
+// command finishes.
+type provisionedMsg struct {
+	password string
+	err      error
+}
+
+var (
+	bgTitleStyle = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("15")).Background(lipgloss.Color("88")).Padding(0, 1)
+	bgLabelStyle = lipgloss.NewStyle().Bold(true)
+	bgHintStyle  = lipgloss.NewStyle().Faint(true)
+	bgErrStyle   = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("9"))
+	bgOKStyle    = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("10"))
+	bgPwStyle    = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("0")).Background(lipgloss.Color("11")).Padding(0, 1)
+	bgBoxStyle   = lipgloss.NewStyle().Border(lipgloss.RoundedBorder()).Padding(1, 3)
+)
+
+// bgModel is the bubbletea model for the provisioning console. It is a pointer
+// model so Update can mutate in place; the only field touched from the background
+// command is read after the command returns via provisionedMsg.
+type bgModel struct {
+	ctx        context.Context
+	store      ownerStore
+	rootDomain string
+
+	inputs  []textinput.Model
+	focus   int
+	state   bgState
+	formErr string
+
+	username string
+	password string
+	err      error
+}
+
+func newBGModel(ctx context.Context, s ownerStore, rootDomain string) *bgModel {
+	user := textinput.New()
+	user.Placeholder = "owner"
+	user.SetValue("owner")
+	user.CharLimit = 64
+	user.Width = 40
+	user.Prompt = ""
+	user.Focus()
+
+	email := textinput.New()
+	email.Placeholder = "(optional)"
+	email.CharLimit = 254
+	email.Width = 40
+	email.Prompt = ""
+
+	return &bgModel{
+		ctx:        ctx,
+		store:      s,
+		rootDomain: rootDomain,
+		inputs:     []textinput.Model{user, email},
+		focus:      0,
+		state:      stateForm,
+	}
+}
+
+func (m *bgModel) Init() tea.Cmd { return textinput.Blink }
+
+func (m *bgModel) focusInput(i int) tea.Cmd {
+	if i < 0 {
+		i = len(m.inputs) - 1
+	}
+	if i >= len(m.inputs) {
+		i = 0
+	}
+	m.focus = i
+	var cmd tea.Cmd
+	for j := range m.inputs {
+		if j == i {
+			cmd = m.inputs[j].Focus()
+		} else {
+			m.inputs[j].Blur()
+		}
+	}
+	return cmd
+}
+
+func (m *bgModel) updateInputs(msg tea.Msg) tea.Cmd {
+	cmds := make([]tea.Cmd, len(m.inputs))
+	for i := range m.inputs {
+		m.inputs[i], cmds[i] = m.inputs[i].Update(msg)
+	}
+	return tea.Batch(cmds...)
+}
+
+func (m *bgModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case provisionedMsg:
+		if msg.err != nil {
+			m.state, m.err = stateError, msg.err
+		} else {
+			m.state, m.password = stateDone, msg.password
+		}
+		return m, nil
+
+	case tea.KeyMsg:
+		switch m.state {
+		case stateDone, stateError:
+			// Any key dismisses the terminal screen.
+			return m, tea.Quit
+		case stateWorking:
+			// Ignore input while the database write is in flight.
+			return m, nil
+		case stateForm:
+			switch msg.String() {
+			case "ctrl+c", "esc":
+				return m, tea.Quit
+			case "tab", "down":
+				return m, m.focusInput(m.focus + 1)
+			case "shift+tab", "up":
+				return m, m.focusInput(m.focus - 1)
+			case "enter":
+				if strings.TrimSpace(m.inputs[0].Value()) == "" {
+					m.formErr = "username is required"
+					return m, m.focusInput(0)
+				}
+				m.username = strings.TrimSpace(m.inputs[0].Value())
+				m.state, m.formErr = stateWorking, ""
+				return m, provisionCmd(m.ctx, m.store, m.username, m.inputs[1].Value())
+			}
+		}
+	}
+
+	cmd := m.updateInputs(msg)
+	return m, cmd
+}
+
+func (m *bgModel) View() string {
+	var b strings.Builder
+	b.WriteString(bgTitleStyle.Render("⚠  FELIS BREAK-GLASS — LOCAL EMERGENCY CONSOLE") + "\n\n")
+
+	switch m.state {
+	case stateForm:
+		b.WriteString("Provision (or reset) the Owner account and enable local-password login.\n")
+		b.WriteString("This writes directly to Postgres, bypassing the web Zero-Trust path.\n\n")
+		b.WriteString(bgLabelStyle.Render("Owner username") + "\n")
+		b.WriteString(m.inputs[0].View() + "\n\n")
+		b.WriteString(bgLabelStyle.Render("Owner email (optional)") + "\n")
+		b.WriteString(m.inputs[1].View() + "\n\n")
+		if m.formErr != "" {
+			b.WriteString(bgErrStyle.Render(m.formErr) + "\n\n")
+		}
+		b.WriteString(bgHintStyle.Render("tab/↑↓ move · enter provision · esc cancel") + "\n")
+
+	case stateWorking:
+		b.WriteString("Provisioning the Owner account…\n")
+
+	case stateDone:
+		b.WriteString(bgOKStyle.Render("✓ Owner provisioned · local-password login ENABLED") + "\n\n")
+		box := bgLabelStyle.Render("username  ") + m.username + "\n" +
+			bgLabelStyle.Render("password  ") + bgPwStyle.Render(m.password)
+		b.WriteString(bgBoxStyle.Render(box) + "\n\n")
+		b.WriteString(bgErrStyle.Render("Record this password now — it is shown only once.") + "\n")
+		b.WriteString("You will be required to change it on first login.\n\n")
+		if m.rootDomain != "" {
+			b.WriteString("Log in at " + bgLabelStyle.Render("https://op.console."+m.rootDomain) + "\n\n")
+		}
+		b.WriteString(bgHintStyle.Render("press any key to exit") + "\n")
+
+	case stateError:
+		b.WriteString(bgErrStyle.Render("✗ Provisioning failed") + "\n\n")
+		b.WriteString(m.err.Error() + "\n\n")
+		b.WriteString(bgHintStyle.Render("press any key to exit") + "\n")
+	}
+	return b.String()
+}
+
+// provisionCmd runs the two load-bearing writes off the UI goroutine and reports
+// the outcome back as a provisionedMsg. The Owner row is written first, then local
+// auth is enabled. If enabling local auth fails, the message carries the error and
+// Update routes to stateError: the generated plaintext in msg.password is dropped —
+// never displayed and never stored anywhere — so a partial run leaks nothing. This
+// is safe because the Owner row is unreachable for login while local_auth_enabled is
+// unset, and re-running break-glass is idempotent (UpsertOwner is ON CONFLICT, so it
+// overwrites the hash and re-issues a fresh password) and converges the toggle.
+func provisionCmd(ctx context.Context, s ownerStore, username, email string) tea.Cmd {
+	return func() tea.Msg {
+		pw, err := provisionOwner(ctx, s, username, email)
+		if err == nil {
+			err = enableLocalAuth(ctx, s)
+		}
+		return provisionedMsg{password: pw, err: err}
+	}
+}
+
+// runBreakGlassTUI drives the bubbletea program and projects the final model onto a
+// breakGlassResult. It is the thin, untested shell; the logic it invokes
+// (provisionOwner / enableLocalAuth) is unit-tested directly.
+func runBreakGlassTUI(ctx context.Context, s ownerStore, rootDomain string) (breakGlassResult, error) {
+	final, err := tea.NewProgram(newBGModel(ctx, s, rootDomain), tea.WithAltScreen()).Run()
+	if err != nil {
+		return breakGlassResult{}, err
+	}
+	m, ok := final.(*bgModel)
+	if !ok {
+		return breakGlassResult{}, errors.New("unexpected final model")
+	}
+	if m.state == stateError {
+		return breakGlassResult{}, m.err
+	}
+	return breakGlassResult{
+		provisioned: m.state == stateDone,
+		username:    m.username,
+		password:    m.password,
+		rootDomain:  rootDomain,
+	}, nil
+}