Host.go: assign registered nicks to users upon connection.

auth.go

@@ -67,6 +67,7 @@ type Auth struct {
 
 	settingsMu      sync.RWMutex
 	allowlistMode   bool
+	keynamesMode    bool
 	opLoader        KeyLoader
 	allowlistLoader KeyLoader
 }
@@ -96,6 +97,18 @@ func (a *Auth) SetAllowlistMode(value bool) {
 	a.allowlistMode = value
 }
 
+func (a *Auth) SetKeynamesMode(value bool) {
+	a.settingsMu.Lock()
+	defer a.settingsMu.Unlock()
+	a.keynamesMode = value
+}
+
+func (a *Auth) Keyname(key ssh.PublicKey) string {
+	fingerprint := sshd.Fingerprint(key)
+	name := a.keynamesByFingerprint[fingerprint]
+	return name
+}
+
 // SetPassphrase enables passphrase authentication with the given passphrase.
 // If an empty passphrase is given, disable passphrase authentication.
 func (a *Auth) SetPassphrase(passphrase string) {

host.go

@@ -101,6 +101,15 @@ func (h *Host) isOp(conn sshd.Connection) bool {
 // Connect a specific Terminal to this host and its room.
 func (h *Host) Connect(term *sshd.Terminal) {
 	id := NewIdentity(term.Conn)
+
+	if h.auth.keynamesMode {
+		name := h.auth.Keyname(id.PublicKey())
+		if len(name) >0 {
+			id.SetName(name)
+			id.SetSymbol("✓")
+		}
+	}
+
 	user := message.NewUserScreen(id, term)
 	user.OnChange = func() {
 		term.SetPrompt(GetPrompt(user))