Fix web UI download links for CA certs, SSH CA pubkey, and KRL

Templates linked to /v1/ API server routes which don't exist on the
web server (separate binary). Add web server handlers that fetch data
via gRPC and serve the downloads directly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/webserver/routes.go

@@ -50,6 +50,8 @@ func (ws *WebServer) registerRoutes(r chi.Router) {
 
 	r.Route("/sshca", func(r chi.Router) {
 		r.Get("/", ws.requireAuth(ws.handleSSHCA))
+		r.Get("/ca", ws.requireAuth(ws.handleSSHCADownload))
+		r.Get("/krl", ws.requireAuth(ws.handleSSHCAKRLDownload))
 		r.Post("/sign-user", ws.requireAuth(ws.handleSSHCASignUser))
 		r.Post("/sign-host", ws.requireAuth(ws.handleSSHCASignHost))
 		r.Get("/cert/{serial}", ws.requireAuth(ws.handleSSHCACertDetail))
@@ -91,6 +93,7 @@ func (ws *WebServer) registerRoutes(r chi.Router) {
 
 	r.Route("/pki", func(r chi.Router) {
 		r.Get("/", ws.requireAuth(ws.handlePKI))
+		r.Get("/ca", ws.requireAuth(ws.handlePKIRootCA))
 		r.Post("/import-root", ws.requireAuth(ws.handleImportRoot))
 		r.Post("/create-issuer", ws.requireAuth(ws.handleCreateIssuer))
 		r.Post("/issue", ws.requireAuth(ws.handleIssueCert))
@@ -475,6 +478,25 @@ func (ws *WebServer) handleCreateIssuer(w http.ResponseWriter, r *http.Request)
 	http.Redirect(w, r, "/pki", http.StatusFound)
 }
 
+func (ws *WebServer) handlePKIRootCA(w http.ResponseWriter, r *http.Request) {
+	token := extractCookie(r)
+	mountName, err := ws.findCAMount(r, token)
+	if err != nil {
+		http.Error(w, "no CA engine mounted", http.StatusNotFound)
+		return
+	}
+
+	certPEM, err := ws.vault.GetRootCert(r.Context(), mountName)
+	if err != nil || len(certPEM) == 0 {
+		http.Error(w, "root CA not found", http.StatusNotFound)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/x-pem-file")
+	w.Header().Set("Content-Disposition", "attachment; filename=root-ca.pem")
+	_, _ = w.Write(certPEM) //nolint:gosec
+}
+
 func (ws *WebServer) handlePKIIssuer(w http.ResponseWriter, r *http.Request) {
 	token := extractCookie(r)
 	mountName, err := ws.findCAMount(r, token)

internal/webserver/sshca.go

@@ -40,6 +40,44 @@ func (ws *WebServer) handleSSHCA(w http.ResponseWriter, r *http.Request) {
 	ws.renderTemplate(w, "sshca.html", data)
 }
 
+func (ws *WebServer) handleSSHCADownload(w http.ResponseWriter, r *http.Request) {
+	token := extractCookie(r)
+	mountName, err := ws.findSSHCAMount(r, token)
+	if err != nil {
+		http.Error(w, "no SSH CA engine mounted", http.StatusNotFound)
+		return
+	}
+
+	pubkey, err := ws.vault.GetSSHCAPublicKey(r.Context(), mountName)
+	if err != nil || pubkey == nil {
+		http.Error(w, "CA public key not found", http.StatusNotFound)
+		return
+	}
+
+	w.Header().Set("Content-Type", "text/plain")
+	w.Header().Set("Content-Disposition", "attachment; filename=ca.pub")
+	_, _ = w.Write([]byte(pubkey.PublicKey)) //nolint:gosec
+}
+
+func (ws *WebServer) handleSSHCAKRLDownload(w http.ResponseWriter, r *http.Request) {
+	token := extractCookie(r)
+	mountName, err := ws.findSSHCAMount(r, token)
+	if err != nil {
+		http.Error(w, "no SSH CA engine mounted", http.StatusNotFound)
+		return
+	}
+
+	krl, err := ws.vault.GetSSHCAKRL(r.Context(), mountName)
+	if err != nil {
+		http.Error(w, "KRL not found", http.StatusNotFound)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/octet-stream")
+	w.Header().Set("Content-Disposition", "attachment; filename=krl.bin")
+	_, _ = w.Write(krl) //nolint:gosec
+}
+
 func (ws *WebServer) handleSSHCASignUser(w http.ResponseWriter, r *http.Request) {
 	info := tokenInfoFromContext(r.Context())
 	token := extractCookie(r)

web/templates/pki.html

@@ -27,7 +27,7 @@
         </tbody>
     </table>
     <p style="margin-top: 1rem; margin-bottom: 0;">
-        <a href="/v1/pki/{{.MountName}}/ca" download="root-ca.pem">Download Root CA (PEM)</a>
+        <a href="/pki/ca" download="root-ca.pem">Download Root CA (PEM)</a>
     </p>
     {{else}}
     <p>No root CA configured.</p>

web/templates/sshca.html

@@ -14,7 +14,7 @@
     {{if .CAPublicKey}}
     <textarea rows="3" class="pem-input" readonly>{{.CAPublicKey}}</textarea>
     <p style="margin-top: 0.5rem; margin-bottom: 0;">
-        <a href="/v1/sshca/{{.MountName}}/ca" download="ca.pub">Download CA Public Key</a>
+        <a href="/sshca/ca" download="ca.pub">Download CA Public Key</a>
     </p>
     {{else}}
     <p>CA public key not available.</p>
@@ -210,7 +210,7 @@
 {{if .IsAdmin}}
 <div class="card">
     <div class="card-title">Key Revocation List</div>
-    <p><a href="/v1/sshca/{{.MountName}}/krl" download="krl.bin">Download KRL</a></p>
+    <p><a href="/sshca/krl" download="krl.bin">Download KRL</a></p>
 </div>
 {{end}}
 {{end}}