initial tpm broker
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Audiobuzz
@@ -0,0 +1,201 @@
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// admin.go — the mTLS admin plane: the pending-queue web UI + approve/deny.
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//
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// This listener is the AUTHENTICATED half of the broker and must live on the
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// management network / loopback only — NEVER the boot LAN (docs invariant: the
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// management plane is recon-valuable). Admins authenticate with a client cert
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// issued by the fleet CA; the cert CN is recorded as who approved each enrolment.
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// The fingerprint shown here is what the admin cross-checks against the device's
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// Plymouth splash before approving (the human OOB gate).
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package main
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import (
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"crypto/tls"
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"crypto/x509"
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"html/template"
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"log"
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"net/http"
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"os"
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"time"
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)
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func (b *broker) serveAdmin() {
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mux := http.NewServeMux()
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mux.HandleFunc("GET /", b.handleAdminIndex)
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mux.HandleFunc("GET /pending", b.handleAdminPending)
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mux.HandleFunc("POST /approve/{id}", b.handleApprove)
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mux.HandleFunc("POST /deny/{id}", b.handleDeny)
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srv := &http.Server{
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Addr: b.cfg.adminAddr,
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Handler: mux,
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ReadHeaderTimeout: 5 * time.Second,
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ReadTimeout: 10 * time.Second,
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WriteTimeout: 40 * time.Second, // approve blocks on step-ca
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IdleTimeout: 60 * time.Second,
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}
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if b.cfg.adminInsecure {
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log.Printf("WARNING: BROKER_ADMIN_INSECURE=true — admin UI is PLAINTEXT with NO client-cert auth. DEV ONLY. Bind to loopback and never expose it.")
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log.Fatalf("admin listener: %v", srv.ListenAndServe())
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return
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}
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if b.cfg.adminCert == "" || b.cfg.adminKey == "" || b.cfg.adminClientCA == "" {
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log.Fatalf("admin mTLS requires BROKER_ADMIN_CERT, BROKER_ADMIN_KEY and BROKER_ADMIN_CLIENT_CA (or set BROKER_ADMIN_INSECURE=true for dev)")
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}
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cert, err := tls.LoadX509KeyPair(b.cfg.adminCert, b.cfg.adminKey)
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if err != nil {
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log.Fatalf("admin server cert: %v", err)
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}
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caPEM, err := os.ReadFile(b.cfg.adminClientCA)
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if err != nil {
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log.Fatalf("admin client CA: %v", err)
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}
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pool := x509.NewCertPool()
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if !pool.AppendCertsFromPEM(caPEM) {
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log.Fatalf("admin client CA %s contains no certificates", b.cfg.adminClientCA)
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}
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srv.TLSConfig = &tls.Config{
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Certificates: []tls.Certificate{cert},
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ClientAuth: tls.RequireAndVerifyClientCert,
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ClientCAs: pool,
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MinVersion: tls.VersionTLS12,
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}
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log.Fatalf("admin listener: %v", srv.ListenAndServeTLS("", ""))
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}
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func adminCN(r *http.Request) string {
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if r.TLS != nil && len(r.TLS.PeerCertificates) > 0 {
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if cn := r.TLS.PeerCertificates[0].Subject.CommonName; cn != "" {
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return cn
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}
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return "unknown-admin"
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}
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return "dev-insecure"
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}
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func (b *broker) handleAdminPending(w http.ResponseWriter, _ *http.Request) {
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writeJSON(w, http.StatusOK, b.store.Pending())
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}
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func (b *broker) handleApprove(w http.ResponseWriter, r *http.Request) {
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id := r.PathValue("id")
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admin := adminCN(r)
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csrPEM, ok := b.store.csrFor(id)
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if !ok {
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http.Error(w, "enrol-id not pending (expired/decided/unknown)", http.StatusConflict)
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return
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}
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csr, err := parseCSR(csrPEM)
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if err != nil {
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http.Error(w, "stored CSR unparsable: "+err.Error(), http.StatusInternalServerError)
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return
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}
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ctx, cancel := ctxWithTimeout(35 * time.Second)
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defer cancel()
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certPEM, serial, err := b.signer.Sign(ctx, csrPEM, csr.Subject.CommonName)
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if err != nil {
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log.Printf("audit approve-FAILED id=%s admin=%q err=%v", id, admin, err)
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http.Error(w, "signing failed: "+err.Error(), http.StatusBadGateway)
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return
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}
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e, err := b.store.Approve(id, certPEM, serial, admin)
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if err != nil {
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http.Error(w, err.Error(), http.StatusConflict)
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return
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}
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log.Printf("audit APPROVE id=%s cn=%q serial=%s hostnqn=%s admin=%q", e.ID, e.CN, e.CertSerial, e.Hostnqn, admin)
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redirectOrJSON(w, r)
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}
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func (b *broker) handleDeny(w http.ResponseWriter, r *http.Request) {
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id := r.PathValue("id")
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admin := adminCN(r)
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e, err := b.store.Deny(id, admin)
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if err != nil {
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http.Error(w, err.Error(), http.StatusConflict)
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return
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}
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log.Printf("audit DENY id=%s cn=%q admin=%q", e.ID, e.CN, admin)
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redirectOrJSON(w, r)
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}
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// redirectOrJSON sends a browser form back to the queue, or a 204 for API callers.
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func redirectOrJSON(w http.ResponseWriter, r *http.Request) {
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if isBrowser(r) {
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http.Redirect(w, r, "/", http.StatusSeeOther)
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return
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}
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w.WriteHeader(http.StatusNoContent)
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}
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func isBrowser(r *http.Request) bool {
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a := r.Header.Get("Accept")
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return len(a) >= 9 && a[:9] == "text/html" || // explicit
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r.Header.Get("Sec-Fetch-Mode") == "navigate"
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}
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func (b *broker) handleAdminIndex(w http.ResponseWriter, r *http.Request) {
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data := struct {
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Admin string
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Pending []*Enrolment
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Now time.Time
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}{
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Admin: adminCN(r),
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Pending: b.store.Pending(),
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Now: time.Now(),
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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if err := adminTmpl.Execute(w, data); err != nil {
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log.Printf("admin template: %v", err)
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}
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}
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var adminTmpl = template.Must(template.New("admin").Funcs(template.FuncMap{
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"age": func(t time.Time) string { return time.Since(t).Round(time.Second).String() },
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}).Parse(adminHTML))
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const adminHTML = `<!doctype html>
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<html lang="en"><head><meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>fleet enrolment — pending</title>
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<style>
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:root{color-scheme:dark}
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body{background:#0b0f14;color:#cfe3ee;font:14px/1.5 ui-monospace,Menlo,Consolas,monospace;margin:0;padding:1.5rem}
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h1{font-size:1.1rem;color:#7fd1ff;margin:0 0 .25rem}
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.sub{color:#6b8294;margin:0 0 1.25rem}
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.empty{color:#6b8294;padding:2rem 0}
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.card{background:#111923;border:1px solid #1f2d3a;border-radius:8px;padding:1rem 1.1rem;margin:0 0 1rem}
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.fp{font-size:1.25rem;color:#aef9b0;letter-spacing:.5px;word-break:break-word}
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.meta{display:grid;grid-template-columns:max-content 1fr;gap:.1rem .8rem;margin:.6rem 0;color:#9fb6c4}
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.meta b{color:#6b8294;font-weight:400}
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.actions{margin-top:.7rem}
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button{font:inherit;border:0;border-radius:6px;padding:.45rem .9rem;cursor:pointer}
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.approve{background:#15602f;color:#d6ffe0}
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.deny{background:#5e1b1b;color:#ffd9d9;margin-left:.5rem}
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form{display:inline}
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code{color:#cfe3ee}
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</style></head><body>
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<h1>fleet enrolment — pending approvals</h1>
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<p class="sub">admin: <code>{{.Admin}}</code> · {{len .Pending}} pending · cross-check each fingerprint against the device's splash before approving</p>
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{{if not .Pending}}<div class="empty">no pending enrolments.</div>{{end}}
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{{range .Pending}}
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<div class="card">
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<div class="fp">{{.Fingerprint}}</div>
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<div class="meta">
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<b>enrol-id</b><code>{{.ID}}</code>
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<b>CN</b><code>{{.CN}}</code>
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{{if .Context.MAC}}<b>MAC</b><code>{{.Context.MAC}}</code>{{end}}
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{{if .Context.DMISerial}}<b>DMI serial</b><code>{{.Context.DMISerial}}</code>{{end}}
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{{if .Context.DMIUUID}}<b>DMI uuid</b><code>{{.Context.DMIUUID}}</code>{{end}}
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{{if .Context.EKHash}}<b>TPM EK</b><code>{{.Context.EKHash}}</code>{{end}}
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<b>pubkey</b><code>{{.PubKeyHash}}</code>
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<b>age</b><code>{{age .CreatedAt}}</code>
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</div>
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<div class="actions">
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<form method="post" action="/approve/{{.ID}}"><button class="approve" type="submit">approve</button></form>
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<form method="post" action="/deny/{{.ID}}"><button class="deny" type="submit">deny</button></form>
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</div>
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</div>
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{{end}}
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</body></html>`
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