Version 0.9.1

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -32,7 +32,11 @@ sudo pacman -S freerdp gnome-keyring   # use kwallet instead of gnome-keyring on
 - **SFTP**: two-pane file browser (local ↔ remote), drag & drop, recursive folders, rename, delete, chmod and progress display
 - **RDP in a tab** right inside MrTerm (Windows: `mstsc`, Linux: FreeRDP), or in a separate window if you prefer
 - **Keychain**: generate Ed25519/ECDSA/RSA keys, import existing ones and copy the public key
+- **Docker & Podman**: list a host's containers, open a shell inside a container, follow logs, and start, stop, restart or remove containers, all over SSH
+- **Firewall**: view and edit UFW and iptables/ip6tables rules on your servers
+- **Network**: configure interfaces, IP addresses, DHCP, gateway, DNS, bonds (LACP), bridges, VLANs and the hostname on Ubuntu and Debian/Proxmox servers, with automatic rollback
 - **Port forwarding**: local (-L), remote (-R) and dynamic/SOCKS5 (-D)
+- **VPN**: add WireGuard or OpenVPN configurations and assign them to hosts. MrTerm connects the VPN automatically when you open such a host
 - **Snippets**: save frequently used commands and send them to a terminal with one click
 - **Known hosts**: MrTerm warns you if a server's host key changes
 - **History** of recent connections
@@ -40,6 +44,7 @@ sudo pacman -S freerdp gnome-keyring   # use kwallet instead of gnome-keyring on
 - **Backup** export and import
 - **7 app themes** (Midnight, Navy, Nord, Dracula, Catppuccin, Forest, Light) plus a custom accent color
 - **Encrypted vault** using your operating system's keyring (Windows DPAPI, Linux libsecret/KWallet)
+- **App lock** with a password and/or a FIDO2 security key such as a YubiKey. The vault is then additionally encrypted, and it can lock automatically when you're inactive
 - **Automatic updates**: MrTerm checks for new versions on startup and can install them for you
 
 ## Getting started
@@ -61,9 +66,72 @@ For a quick one-off connection, press `Ctrl+Shift+K` and type `user@host` (or `r
 | `Ctrl+Shift+C` / `Ctrl+Shift+V` | Copy / paste in the terminal |
 | `Ctrl+Shift+F` | Search in the terminal |
 | `Ctrl` + `+` / `-` / `0` | Font size |
+| `Ctrl+Shift+L` | Lock MrTerm |
 
 `Ctrl+W`, `Ctrl+K` and `Ctrl+T` still reach the terminal, so editors like nano work as usual.
 
+## Docker
+
+Right-click an SSH host and choose **Docker containers**, or click **Docker** in the toolbar of an open terminal. MrTerm connects over SSH and shows all containers on that host, with status, ports, CPU and memory.
+
+- **Open shell**: opens a terminal tab inside the container (bash if available, otherwise sh). You can also double-click a running container.
+- **Logs**: follows the container's logs live in a terminal tab.
+- **Start, stop, restart, delete** from the row buttons or the right-click menu.
+
+Nothing needs to be installed on the server. MrTerm uses the `docker` command (or `podman` if Docker isn't installed). Your SSH user needs permission to run it, which usually means membership in the `docker` group (`sudo usermod -aG docker <user>`). If a password is saved for the host, MrTerm falls back to `sudo` automatically.
+
+## Firewall
+
+Right-click an SSH host and choose **Firewall**, or click **Firewall** in the toolbar of an open terminal. MrTerm supports **UFW** and **iptables/ip6tables**. If a server has both, you can switch between them at the top.
+
+- **UFW**: turn the firewall on or off, change the default policies for incoming and outgoing traffic, and add or delete rules (allow, deny, reject, limit, with port, protocol, source and comment).
+- **iptables**: all chains with their rules, the policy of INPUT, FORWARD and OUTPUT, and adding or deleting rules. iptables changes are lost on reboot unless you click **Save permanently** (uses `netfilter-persistent` on Debian/Ubuntu or `/etc/iptables/*.rules` on Arch).
+- **Lockout protection**: if you enable UFW without a rule that allows SSH, MrTerm warns you and offers to allow SSH first. Switching a default policy to blocking asks for confirmation.
+
+UFW rules can only be viewed and added while UFW is enabled.
+
+This needs root privileges. Either log in as root, or save the password of a user with sudo rights on the host.
+
+## Network
+
+Right-click an SSH host and choose **Network**, or click **Network** in the terminal toolbar. MrTerm shows every interface with its state, MAC address, MTU and IP addresses. Bonds also show their mode, LACP rate and the status of each member. The default gateway, DNS servers and hostname appear at the top.
+
+On **Ubuntu (netplan)** and **Debian/Proxmox (ifupdown)** you can also edit the configuration:
+
+- **Per interface**: DHCP or static IPv4 addresses, gateway, DNS servers and search domains, IPv6 (SLAAC, DHCPv6, static or disabled) and MTU
+- **Bonds** with any mode, including **802.3ad (LACP)** with LACP rate, hash policy and MII monitoring
+- **Bridges** (e.g. Proxmox `vmbr`) and **VLANs**, which you can also create and delete
+- **Hostname** and, if not managed by systemd-resolved, `/etc/resolv.conf`
+- **Config files**: edit the netplan files, `/etc/network/interfaces` or `/etc/hosts` directly
+
+**Automatic rollback:** before applying a change, MrTerm backs up the configuration and checks the new one. After applying it, MrTerm opens a new SSH connection to confirm the server is still reachable. If that doesn't work within 90 seconds, the server restores the previous configuration by itself, so a wrong IP address won't lock you out. If your change affects the address MrTerm connects to, enter the new address in the confirmation dialog.
+
+On Ubuntu, MrTerm writes the complete netplan configuration to `/etc/netplan/90-mrterm.yaml` and renames the previous files to `*.yaml.mrterm-off`. On Debian/Proxmox, only the changed interfaces are rewritten, and all other lines (such as `post-up` or `bridge-fd`) are kept.
+
+Root privileges are required, the same as for the firewall.
+
+## VPN
+
+Under **VPN** in the sidebar you can add WireGuard (`.conf`) and OpenVPN (`.ovpn`) configurations. Paste them or load them from a file, then assign hosts, either in the VPN itself or through the *VPN* field of a host.
+
+When you open an assigned host (terminal, SFTP, RDP or port forwarding), MrTerm connects the VPN first if it isn't already connected. You can also connect and disconnect manually. By default, MrTerm disconnects the VPNs it started when you close it.
+
+- **Linux**: uses NetworkManager, so no root password is needed. For OpenVPN, install the plugin with `sudo pacman -S networkmanager-openvpn`.
+- **Windows**: WireGuard requires [WireGuard for Windows](https://www.wireguard.com/install/) and asks for administrator permission when connecting. OpenVPN requires the [OpenVPN GUI](https://openvpn.net/community-downloads/).
+- OpenVPN certificates and keys must be embedded in the `.ovpn` file.
+
+## App lock
+
+Under **Settings → App lock** you can protect MrTerm with a password, one or more FIDO2 security keys (e.g. YubiKey), or both. Once a method is set up:
+
+- MrTerm starts locked, and your hosts, keys and passwords stay encrypted until you unlock it.
+- Lock it any time with the lock icon in the title bar or `Ctrl+Shift+L`, or let it lock automatically after a period of inactivity.
+- Open sessions keep running in the background while MrTerm is locked.
+
+Security keys need to support the *hmac-secret* (PRF) extension, which YubiKey 5 and most current FIDO2 keys do. Touching the key is enough, no PIN is needed. On Linux, the key must be accessible to your user. This is the default on Arch/CachyOS.
+
+**Keep in mind:** if you forget the password and lose all registered security keys, your vault cannot be recovered. Setting up a second unlock method is a good idea.
+
 ## Updates
 
 MrTerm looks for updates on startup. You can also check manually under **Settings → Updates**. When a new version is available, click **Install now** and MrTerm will download the right package for your system and restart.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "mrterm",
-  "version": "0.4.0",
+  "version": "0.9.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mrterm",
-      "version": "0.4.0",
+      "version": "0.9.1",
       "license": "MIT",
       "dependencies": {
         "@xterm/addon-fit": "^0.11.0",

package.json

@@ -1,7 +1,7 @@
 {
   "name": "mrterm",
   "productName": "MrTerm",
-  "version": "0.4.0",
+  "version": "0.9.1",
   "description": "Moderner SSH-, SFTP- und RDP-Client",
   "main": "src/main/main.js",
   "author": "MrBlake",

scripts/release-all.sh

@@ -24,7 +24,9 @@ if [[ "$version" != "$current" ]]; then
   git add package.json package-lock.json
   git commit -m "Version ${version}"
 fi
-git push origin HEAD
+# Push mit dem Gitea-Token (Basic-Auth, Benutzer aus GITEA_USER, Standard MrBlake)
+auth="$(printf '%s:%s' "${GITEA_USER:-MrBlake}" "$GITEA_TOKEN" | base64 -w0)"
+git -c http.extraHeader="Authorization: Basic ${auth}" push origin HEAD
 
 rm -rf dist
 npm run dist:linux

src/i18n.js

@@ -311,6 +311,238 @@
     'Actions': 'Aktionen',
     'Log in': 'Anmelden',
 
+    // App-Sperre
+    'App lock': 'App-Sperre',
+    'Lock MrTerm with a password and/or a FIDO2 security key (e.g. YubiKey). The vault is then additionally encrypted and can only be opened with one of these methods.': 'MrTerm mit Passwort und/oder FIDO2-Sicherheitsschlüssel (z. B. YubiKey) sperren. Der Vault wird dann zusätzlich verschlüsselt und lässt sich nur mit einer dieser Methoden öffnen.',
+    'MrTerm is locked': 'MrTerm ist gesperrt',
+    'MrTerm is locked.': 'MrTerm ist gesperrt.',
+    'Unlock': 'Entsperren',
+    'Unlock with security key': 'Mit Sicherheitsschlüssel entsperren',
+    'Disable app lock?': 'App-Sperre deaktivieren?',
+    'This is the last unlock method. MrTerm will no longer be locked.': 'Das ist die letzte Entsperrmethode. MrTerm wird danach nicht mehr gesperrt.',
+    'Disable': 'Deaktivieren',
+    'Set': 'Festgelegt',
+    'Not set': 'Nicht festgelegt',
+    'Change password': 'Passwort ändern',
+    'Set password': 'Passwort festlegen',
+    'New password': 'Neues Passwort',
+    'Repeat password': 'Passwort wiederholen',
+    'The passwords do not match.': 'Die Passwörter stimmen nicht überein.',
+    'Password saved': 'Passwort gespeichert',
+    'Security key': 'Sicherheitsschlüssel',
+    'Security key (FIDO2)': 'Sicherheitsschlüssel (FIDO2)',
+    'Remove security key?': 'Sicherheitsschlüssel entfernen?',
+    'Add security key': 'Sicherheitsschlüssel hinzufügen',
+    'Security key added': 'Sicherheitsschlüssel hinzugefügt',
+    'Lock now': 'Jetzt sperren',
+    'Lock (Ctrl+Shift+L)': 'Sperren (Strg+Shift+L)',
+    'Lock automatically after inactivity': 'Automatisch sperren bei Inaktivität',
+    'Never': 'Nie',
+    '{n} minutes': '{n} Minuten',
+    'If you forget the password and lose all security keys, the vault cannot be recovered.': 'Wenn du das Passwort vergisst und alle Sicherheitsschlüssel verlierst, lässt sich der Vault nicht wiederherstellen.',
+    'No password set.': 'Kein Passwort festgelegt.',
+    'Wrong password.': 'Falsches Passwort.',
+    'No security key registered.': 'Kein Sicherheitsschlüssel registriert.',
+    'Unknown security key.': 'Unbekannter Sicherheitsschlüssel.',
+    'This security key could not unlock the vault.': 'Dieser Sicherheitsschlüssel konnte den Vault nicht entsperren.',
+    'The password must be at least 6 characters long.': 'Das Passwort muss mindestens 6 Zeichen lang sein.',
+    'Touch your security key to register it.': 'Berühre deinen Sicherheitsschlüssel, um ihn zu registrieren.',
+    'Touch your security key again to finish.': 'Berühre deinen Sicherheitsschlüssel noch einmal zum Abschließen.',
+    'Touch your security key to unlock MrTerm.': 'Berühre deinen Sicherheitsschlüssel, um MrTerm zu entsperren.',
+    'Security key prompt was cancelled or timed out.': 'Die Abfrage des Sicherheitsschlüssels wurde abgebrochen oder ist abgelaufen.',
+    'This security key does not support the hmac-secret/PRF extension.': 'Dieser Sicherheitsschlüssel unterstützt die hmac-secret/PRF-Erweiterung nicht.',
+
+    // VPN
+    '— No VPN —': '— Kein VPN —',
+    'Connected automatically before connecting to this host.': 'Wird vor dem Verbinden mit diesem Host automatisch aufgebaut.',
+    'Search VPNs …': 'VPNs suchen …',
+    'New VPN': 'Neues VPN',
+    'No VPNs': 'Keine VPNs',
+    'Add WireGuard or OpenVPN configurations and assign them to hosts. MrTerm connects the VPN automatically when you open such a host.': 'Füge WireGuard- oder OpenVPN-Konfigurationen hinzu und ordne sie Hosts zu. MrTerm baut das VPN automatisch auf, wenn du einen solchen Host öffnest.',
+    'connected': 'verbunden',
+    'disconnected': 'getrennt',
+    'Disconnect': 'Trennen',
+    'Connecting …': 'Verbinde …',
+    'VPN “{name}” connected': 'VPN „{name}“ verbunden',
+    'Delete VPN?': 'VPN löschen?',
+    '“{name}” will be removed. Assigned hosts will connect without VPN.': '„{name}“ wird entfernt. Zugeordnete Hosts verbinden sich dann ohne VPN.',
+    'Configuration': 'Konfiguration',
+    'Certificates and keys must be embedded in the .ovpn file (<ca>, <cert>, <key> …).': 'Zertifikate und Schlüssel müssen in der .ovpn-Datei eingebettet sein (<ca>, <cert>, <key> …).',
+    'Contents of a WireGuard .conf file.': 'Inhalt einer WireGuard-.conf-Datei.',
+    'Edit VPN': 'VPN bearbeiten',
+    'Office VPN': 'Büro-VPN',
+    'Disconnect when MrTerm closes': 'Beim Beenden von MrTerm trennen',
+    'Assigned hosts': 'Zugeordnete Hosts',
+    'Configuration is missing.': 'Konfiguration fehlt.',
+    'This does not look like a WireGuard configuration.': 'Das sieht nicht nach einer WireGuard-Konfiguration aus.',
+    'VPN configuration': 'VPN-Konfiguration',
+    'NetworkManager (nmcli) not found. MrTerm uses NetworkManager for VPN connections.': 'NetworkManager (nmcli) nicht gefunden. MrTerm nutzt NetworkManager für VPN-Verbindungen.',
+    'OpenVPN support for NetworkManager is missing. Install it with: sudo pacman -S networkmanager-openvpn': 'OpenVPN-Unterstützung für NetworkManager fehlt. Installieren mit: sudo pacman -S networkmanager-openvpn',
+    'VPN configuration could not be imported: {err}': 'VPN-Konfiguration konnte nicht importiert werden: {err}',
+    'VPN “{name}” could not be connected: {err}': 'VPN „{name}“ konnte nicht verbunden werden: {err}',
+    'VPN not found': 'VPN nicht gefunden',
+    'OpenVPN GUI not found. Install OpenVPN from openvpn.net.': 'OpenVPN GUI nicht gefunden. Installiere OpenVPN von openvpn.net.',
+    'WireGuard for Windows not found. Install it from wireguard.com.': 'WireGuard für Windows nicht gefunden. Installiere es von wireguard.com.',
+    'timeout': 'Zeitüberschreitung',
+    'Connecting VPN “{name}” …': 'Baue VPN „{name}“ auf …',
+
+    // Docker
+    'Docker containers': 'Docker-Container',
+    'Search containers …': 'Container suchen …',
+    'Show stopped': 'Gestoppte anzeigen',
+    'Connection closed.': 'Verbindung beendet.',
+    'No containers on this host.': 'Keine Container auf diesem Host.',
+    'Ports': 'Ports',
+    'Memory': 'Speicher',
+    'Open shell': 'Shell öffnen',
+    'Logs': 'Logs',
+    'Restart': 'Neu starten',
+    'Copy ID': 'ID kopieren',
+    'Delete container?': 'Container löschen?',
+    '“{name}” will be removed including its writable layer. Volumes are kept.': '„{name}“ wird samt beschreibbarer Ebene entfernt. Volumes bleiben erhalten.',
+    'Stop container?': 'Container stoppen?',
+    'Started': 'Gestartet',
+    'Stopped': 'Gestoppt',
+    'Restarted': 'Neu gestartet',
+    'Deleted': 'Gelöscht',
+    'Docker session not found': 'Docker-Sitzung nicht gefunden',
+    'Neither Docker nor Podman was found on this host.': 'Auf diesem Host wurde weder Docker noch Podman gefunden.',
+    'No permission to use {runtime}. Add the user to the "docker" group (sudo usermod -aG docker {user}) or save the host password so MrTerm can use sudo.': 'Keine Berechtigung für {runtime}. Füge den Benutzer der Gruppe „docker“ hinzu (sudo usermod -aG docker {user}) oder hinterlege das Host-Passwort, damit MrTerm sudo verwenden kann.',
+    '{runtime} exited with code {code}': '{runtime} beendet mit Code {code}',
+
+    // Firewall
+    'Firewall': 'Firewall',
+    'Save the current iptables rules so they survive a reboot': 'Aktuelle iptables-Regeln speichern, damit sie einen Neustart überstehen',
+    'Save permanently': 'Dauerhaft speichern',
+    'Add rule': 'Regel hinzufügen',
+    'Rules saved permanently': 'Regeln dauerhaft gespeichert',
+    'Enable': 'Aktivieren',
+    'Disable firewall?': 'Firewall deaktivieren?',
+    'All UFW rules will stop filtering traffic.': 'Keine UFW-Regel filtert dann mehr den Datenverkehr.',
+    'Enable firewall?': 'Firewall aktivieren?',
+    'There is no rule that allows SSH (port {port}). Enabling UFW could lock you out of this server.': 'Es gibt keine Regel, die SSH (Port {port}) erlaubt. Wenn du UFW aktivierst, könntest du dich von diesem Server aussperren.',
+    'Enable anyway': 'Trotzdem aktivieren',
+    'Allow SSH and enable': 'SSH erlauben und aktivieren',
+    'Firewall enabled': 'Firewall aktiviert',
+    'Incoming': 'Eingehend',
+    'Outgoing': 'Ausgehend',
+    'Allow': 'Erlauben',
+    'Deny': 'Verweigern',
+    'Reject': 'Abweisen',
+    'Change default policy?': 'Standardrichtlinie ändern?',
+    'Incoming connections without a matching rule will be blocked. Make sure SSH is allowed.': 'Eingehende Verbindungen ohne passende Regel werden dann blockiert. Stelle sicher, dass SSH erlaubt ist.',
+    'Change': 'Ändern',
+    'No rules yet.': 'Noch keine Regeln.',
+    'To': 'Ziel',
+    'Action': 'Aktion',
+    'From': 'Quelle',
+    'Comment': 'Kommentar',
+    'Rule deleted': 'Regel gelöscht',
+    'Changes apply immediately but are lost after a reboot unless you click “Save permanently”.': 'Änderungen gelten sofort, gehen nach einem Neustart aber verloren, wenn du nicht auf „Dauerhaft speichern“ klickst.',
+    'rules': 'Regeln',
+    'Policy': 'Richtlinie',
+    'Traffic without a matching ACCEPT rule will be dropped. Make sure SSH is allowed, or you may lock yourself out.': 'Datenverkehr ohne passende ACCEPT-Regel wird dann verworfen. Stelle sicher, dass SSH erlaubt ist, sonst sperrst du dich eventuell aus.',
+    'Add UFW rule': 'UFW-Regel hinzufügen',
+    'Limit (rate-limit)': 'Begrenzen (Rate-Limit)',
+    'Direction': 'Richtung',
+    'Port': 'Port',
+    'Protocol': 'Protokoll',
+    'Any': 'Beliebig',
+    'From (IP or network)': 'Quelle (IP oder Netz)',
+    'Insert at the top (highest priority)': 'Ganz oben einfügen (höchste Priorität)',
+    'Add': 'Hinzufügen',
+    'Rule added': 'Regel hinzugefügt',
+    'Add {bin} rule': '{bin}-Regel hinzufügen',
+    'Chain': 'Kette',
+    'Target': 'Ziel',
+    'Source (IP or network)': 'Quelle (IP oder Netz)',
+    'Interface': 'Schnittstelle',
+    'Connection state': 'Verbindungsstatus',
+    'Invalid value for {field}: {value}': 'Ungültiger Wert für {field}: {value}',
+    'Firewall session not found': 'Firewall-Sitzung nicht gefunden',
+    'Command failed with code {code}': 'Befehl fehlgeschlagen mit Code {code}',
+    'Root privileges are required. Log in as root or save the password of a user with sudo rights on the host.': 'Dafür sind root-Rechte nötig. Melde dich als root an oder hinterlege am Host das Passwort eines Benutzers mit sudo-Rechten.',
+    'This host uses firewalld, which is not supported yet.': 'Dieser Host nutzt firewalld, das noch nicht unterstützt wird.',
+    'Neither UFW nor iptables was found on this host.': 'Auf diesem Host wurde weder UFW noch iptables gefunden.',
+    'Port ranges and lists need a protocol (TCP or UDP).': 'Portbereiche und -listen brauchen ein Protokoll (TCP oder UDP).',
+    'A port needs the protocol TCP or UDP.': 'Für einen Port ist das Protokoll TCP oder UDP nötig.',
+    'No known way to save iptables rules on this host (e.g. install iptables-persistent).': 'Keine bekannte Möglichkeit, iptables-Regeln auf diesem Host zu speichern (z. B. iptables-persistent installieren).',
+
+    'UFW is disabled': 'UFW ist deaktiviert',
+    'Enable UFW to view or add rules.': 'Aktiviere UFW, um Regeln einzusehen oder anzulegen.',
+    // Netzwerk
+    'Network': 'Netzwerk',
+    'Show virtual interfaces': 'Virtuelle Schnittstellen anzeigen',
+    'Config files': 'Konfigurationsdateien',
+    'New interface': 'Neue Schnittstelle',
+    'New bond': 'Neuer Bond',
+    'New bridge': 'Neue Bridge',
+    'New VLAN': 'Neues VLAN',
+    'The last network change was rolled back automatically ({time}) because MrTerm could not reconnect.': 'Die letzte Netzwerkänderung wurde automatisch zurückgenommen ({time}), weil MrTerm sich nicht erneut verbinden konnte.',
+    'Editing is supported for Ubuntu (netplan) and Debian/Proxmox (ifupdown). This host uses {backend}, so interfaces are shown read-only. Config files can still be edited.': 'Bearbeiten wird für Ubuntu (netplan) und Debian/Proxmox (ifupdown) unterstützt. Dieser Host nutzt {backend}, daher werden die Schnittstellen nur angezeigt. Konfigurationsdateien lassen sich trotzdem bearbeiten.',
+    'none': 'keins',
+    'Hostname': 'Hostname',
+    'Default gateway': 'Standard-Gateway',
+    'DNS servers': 'DNS-Server',
+    'Search': 'Suche',
+    'systemd-resolved is used: set DNS servers per interface.': 'systemd-resolved ist aktiv: DNS-Server pro Schnittstelle festlegen.',
+    'Not configured': 'Nicht konfiguriert',
+    'Static': 'Statisch',
+    'No IPv4': 'Kein IPv4',
+    'Mode': 'Modus',
+    'Configured, but not present': 'Konfiguriert, aber nicht vorhanden',
+    'No address': 'Keine Adresse',
+    'Configured': 'Konfiguriert',
+    'MrTerm reconnects to confirm the change. Without confirmation the server restores the previous configuration after 90 seconds.': 'MrTerm verbindet sich neu, um die Änderung zu bestätigen. Ohne Bestätigung stellt der Server nach 90 Sekunden die vorherige Konfiguration wieder her.',
+    'Saved': 'Gespeichert',
+    'Network change applied and confirmed': 'Netzwerkänderung angewendet und bestätigt',
+    'MrTerm could not reconnect after the change. The server restores the previous configuration automatically within 90 seconds.': 'MrTerm konnte sich nach der Änderung nicht erneut verbinden. Der Server stellt die vorherige Konfiguration innerhalb von 90 Sekunden automatisch wieder her.',
+    'Apply network change?': 'Netzwerkänderung anwenden?',
+    'The change is applied immediately. If MrTerm cannot reconnect within 90 seconds, the server restores the previous configuration automatically.': 'Die Änderung wird sofort angewendet. Kann MrTerm sich nicht innerhalb von 90 Sekunden erneut verbinden, stellt der Server die vorherige Konfiguration automatisch wieder her.',
+    'Reconnect via': 'Neu verbinden über',
+    'Change this if the change affects the address MrTerm uses to connect.': 'Ändern, wenn die Änderung die Adresse betrifft, über die MrTerm sich verbindet.',
+    'Apply': 'Anwenden',
+    'No suitable interfaces found.': 'Keine passenden Schnittstellen gefunden.',
+    'Usually <parent>.<VLAN ID>, e.g. eno1.100': 'Üblich: <Eltern>.<VLAN-ID>, z. B. eno1.100',
+    'Bond': 'Bond',
+    'Members': 'Mitglieder',
+    'LACP rate': 'LACP-Rate',
+    'Hash policy': 'Hash-Richtlinie',
+    'MII monitoring (ms)': 'MII-Überwachung (ms)',
+    'Bridge': 'Bridge',
+    'Spanning Tree (STP)': 'Spanning Tree (STP)',
+    'VLAN ID': 'VLAN-ID',
+    'Parent interface': 'Übergeordnete Schnittstelle',
+    'IPv4 addresses (one per line, CIDR)': 'IPv4-Adressen (eine pro Zeile, CIDR)',
+    'Gateway': 'Gateway',
+    'IPv6 addresses (one per line, CIDR)': 'IPv6-Adressen (eine pro Zeile, CIDR)',
+    'IPv6 gateway': 'IPv6-Gateway',
+    'Method': 'Methode',
+    'No IPv4 address': 'Keine IPv4-Adresse',
+    'Search domains': 'Suchdomänen',
+    'Automatic (SLAAC)': 'Automatisch (SLAAC)',
+    'Disabled': 'Deaktiviert',
+    'New {kind}': 'Neue(r) {kind}',
+    'Select at least one member.': 'Wähle mindestens ein Mitglied aus.',
+    'Select the parent interface.': 'Wähle die übergeordnete Schnittstelle aus.',
+    'An interface with this name already exists.': 'Eine Schnittstelle mit diesem Namen gibt es bereits.',
+    'Applying network configuration …': 'Netzwerkkonfiguration wird angewendet …',
+    'Delete {kind} {name}?': '{kind} {name} löschen?',
+    'The interface is removed from the configuration. Members keep their current settings.': 'Die Schnittstelle wird aus der Konfiguration entfernt. Mitglieder behalten ihre aktuellen Einstellungen.',
+    'Change hostname': 'Hostname ändern',
+    'Hostname changed': 'Hostname geändert',
+    'Written to /etc/resolv.conf.': 'Wird in /etc/resolv.conf geschrieben.',
+    'Content': 'Inhalt',
+    'Saving applies the file with automatic rollback.': 'Beim Speichern wird die Datei mit automatischem Rollback angewendet.',
+    'Saving …': 'Speichere …',
+    'Network session not found': 'Netzwerk-Sitzung nicht gefunden',
+    'netplan configuration could not be read ({err}).': 'netplan-Konfiguration konnte nicht gelesen werden ({err}).',
+    'Editing is not supported for this network configuration ({backend}).': 'Bearbeiten wird für diese Netzwerkkonfiguration ({backend}) nicht unterstützt.',
+    'The new configuration is invalid and was not applied: {err}': 'Die neue Konfiguration ist ungültig und wurde nicht angewendet: {err}',
+    'A static configuration needs at least one IPv4 address (e.g. 192.168.1.10/24).': 'Eine statische Konfiguration braucht mindestens eine IPv4-Adresse (z. B. 192.168.1.10/24).',
+    'A static IPv6 configuration needs at least one IPv6 address.': 'Eine statische IPv6-Konfiguration braucht mindestens eine IPv6-Adresse.',
+
+    'Authentication failed for {user}. Check the username, password or key.': 'Anmeldung für {user} fehlgeschlagen. Prüfe Benutzername, Passwort oder Schlüssel.',
     // Main-Prozess
     'Host key has changed!': 'Host-Schlüssel hat sich geändert!',
     'Unknown host': 'Unbekannter Host',

src/main/docker.js

@@ -0,0 +1,114 @@
+// Docker/Podman auf entfernten Hosts über die bestehende SSH-Verbindung (CLI per exec).
+// Kein Zugriff auf den Docker-Socket nötig: MrTerm führt `docker ps`, `docker start` … aus.
+// Fehlt die Berechtigung (Benutzer nicht in der Gruppe "docker"), wird sudo mit dem gespeicherten Host-Passwort versucht.
+const i18n = require('../i18n');
+
+const SAFE_ID = /^[a-zA-Z0-9][a-zA-Z0-9_.-]*$/;
+const ACTIONS = { start: 'start', stop: 'stop', restart: 'restart', remove: 'rm -f' };
+const LIST_FMT = "'{{.ID}}\\t{{.Names}}\\t{{.Image}}\\t{{.State}}\\t{{.Status}}\\t{{.Ports}}'";
+const STATS_FMT = "'{{.ID}}\\t{{.CPUPerc}}\\t{{.MemUsage}}'";
+const lastLine = (s) => String(s || '').split('\n').map((l) => l.trim()).filter(Boolean).slice(-1)[0] || '';
+const denied = (s) => /permission denied|connect to the docker daemon socket/i.test(s);
+
+function execOn(conn, cmd, stdin) {
+  return new Promise((resolve, reject) => {
+    conn.exec(cmd, (err, stream) => {
+      if (err) return reject(err);
+      let out = '', errOut = '';
+      stream.on('data', (d) => { out += d; });
+      stream.stderr.on('data', (d) => { errOut += d; });
+      stream.on('close', (code) => resolve({ code: code ?? 0, out, err: errOut }));
+      stream.end(stdin ?? '');
+    });
+  });
+}
+
+class DockerManager {
+  constructor(ssh) {
+    this.ssh = ssh;
+    this.sessions = new Map(); // id -> { conn, jumps, host, runtime, sudo }
+  }
+
+  async open(id, host, onClose) {
+    const { conn, jumps } = await this.ssh.connect(host, id);
+    this.sessions.set(id, { conn, jumps, host, runtime: null, sudo: false });
+    conn.on('close', () => { if (this.sessions.has(id)) { this.close(id); onClose(); } });
+    conn.on('error', () => {});
+    return this.list(id);
+  }
+
+  get(id) {
+    const s = this.sessions.get(id);
+    if (!s) throw new Error(i18n.t('Docker session not found'));
+    return s;
+  }
+
+  run(s, args) {
+    const sudo = s.sudo ? "sudo -S -p '' " : '';
+    return execOn(s.conn, `${sudo}${s.runtime} ${args}`, s.sudo ? `${s.host.password || ''}\n` : '');
+  }
+
+  async list(id) {
+    const s = this.get(id);
+    if (!s.runtime) {
+      const r = await execOn(s.conn, 'for c in docker podman; do if command -v $c >/dev/null 2>&1; then echo $c; exit 0; fi; done; exit 127');
+      if (r.code) throw new Error(i18n.t('Neither Docker nor Podman was found on this host.'));
+      s.runtime = r.out.trim();
+    }
+    let r = await this.run(s, `ps -a --format ${LIST_FMT}`);
+    if (r.code && denied(r.err) && !s.sudo) {
+      s.sudo = true;
+      r = await this.run(s, `ps -a --format ${LIST_FMT}`);
+      if (r.code) s.sudo = false;
+    }
+    if (r.code) {
+      if (denied(r.err) || /sudo/i.test(r.err)) {
+        throw new Error(i18n.t('No permission to use {runtime}. Add the user to the "docker" group (sudo usermod -aG docker {user}) or save the host password so MrTerm can use sudo.', { runtime: s.runtime, user: s.host.username || '$USER' }));
+      }
+      throw new Error(lastLine(r.err) || i18n.t('{runtime} exited with code {code}', { runtime: s.runtime, code: r.code }));
+    }
+    const containers = r.out.split('\n').filter(Boolean).map((l) => {
+      const [cid, name, image, state, status, ports] = l.split('\t');
+      return { id: cid.slice(0, 12), name, image, state: (state || '').toLowerCase(), status, ports };
+    });
+    return { runtime: s.runtime, sudo: s.sudo, containers };
+  }
+
+  // CPU/RAM der laufenden Container (dauert ~2 s)
+  async stats(id) {
+    const s = this.get(id);
+    const r = await this.run(s, `stats --no-stream --format ${STATS_FMT}`);
+    if (r.code) return {};
+    return Object.fromEntries(r.out.split('\n').filter(Boolean).map((l) => {
+      const [cid, cpu, mem] = l.split('\t');
+      return [cid.slice(0, 12), { cpu, mem }];
+    }));
+  }
+
+  async action(id, action, cid) {
+    const s = this.get(id);
+    if (!ACTIONS[action] || !SAFE_ID.test(cid)) throw new Error('Invalid action');
+    const r = await this.run(s, `${ACTIONS[action]} ${cid}`);
+    if (r.code) throw new Error(lastLine(r.err) || i18n.t('{runtime} exited with code {code}', { runtime: s.runtime, code: r.code }));
+    return true;
+  }
+
+  // Befehl für einen Terminal-Tab (läuft mit PTY; sudo fragt dort ggf. selbst nach dem Passwort)
+  command(id, kind, cid) {
+    const s = this.get(id);
+    if (!SAFE_ID.test(cid)) throw new Error('Invalid container');
+    const pre = `${s.sudo ? 'sudo ' : ''}${s.runtime}`;
+    if (kind === 'logs') return `${pre} logs -f --tail 500 ${cid}`;
+    return `${pre} exec -it ${cid} sh -c 'if command -v bash >/dev/null 2>&1; then exec bash; else exec sh; fi'`;
+  }
+
+  close(id) {
+    const s = this.sessions.get(id);
+    if (!s) return;
+    this.sessions.delete(id);
+    try { s.conn.end(); } catch {}
+    s.jumps?.forEach((c) => { try { c.end(); } catch {} });
+  }
+}
+
+module.exports = { DockerManager, execOn };

src/main/fido.js

@@ -0,0 +1,86 @@
+// FIDO2/WebAuthn (YubiKey & Co.) für die App-Sperre.
+// Chromium erlaubt WebAuthn nur auf HTTPS oder http://localhost – nicht unter file://. Deshalb läuft die
+// Abfrage in einem kleinen eigenen Fenster, dessen http://localhost-Seite über eine eigene Session
+// abgefangen wird (kein echter Server). rpId ist damit immer "localhost".
+// Aus dem Schlüssel wird per PRF-Erweiterung (CTAP hmac-secret) ein geheimer Wert abgeleitet, der den
+// Datenschlüssel des Vaults verpackt. userVerification "discouraged": Berühren genügt (Electron hat keine PIN-Eingabe).
+const { BrowserWindow, session } = require('electron');
+const i18n = require('../i18n');
+
+const PAGE = `<!DOCTYPE html><html><head><meta charset="utf-8"><style>
+  html,body{margin:0;height:100%;background:#1a1d27;color:#e6e8ef;font:14px system-ui,sans-serif;-webkit-app-region:drag}
+  body{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;border:1px solid #2c3142;box-sizing:border-box;text-align:center;padding:16px}
+  .ic{font-size:34px} #t{max-width:340px;line-height:1.4}
+  button{-webkit-app-region:no-drag;background:#2a2f40;color:#e6e8ef;border:1px solid #3a4054;border-radius:8px;padding:7px 16px;font:inherit;cursor:pointer}
+  button:hover{background:#343a4f}
+</style></head><body><div class="ic">🔑</div><div id="t"></div><button id="c"></button></body></html>`;
+
+let fidoSession;
+function getSession() {
+  if (fidoSession) return fidoSession;
+  fidoSession = session.fromPartition('mrterm-fido');
+  fidoSession.protocol.handle('http', () => new Response(PAGE, { headers: { 'content-type': 'text/html; charset=utf-8' } }));
+  return fidoSession;
+}
+
+// Gemeinsame Hilfsfunktionen im Fenster (base64url <-> Bytes)
+const HELPERS = `
+  const b64 = (u) => btoa(String.fromCharCode(...new Uint8Array(u))).replace(/\\+/g, '-').replace(/\\//g, '_').replace(/=+$/, '');
+  const unb64 = (s) => Uint8Array.from(atob(s.replace(/-/g, '+').replace(/_/g, '/')), (c) => c.charCodeAt(0));
+`;
+
+async function ceremony(parent, text, script) {
+  const w = new BrowserWindow({
+    parent, modal: !!parent, width: 420, height: 210, frame: false, resizable: false, show: false,
+    backgroundColor: '#1a1d27', webPreferences: { session: getSession(), contextIsolation: true, sandbox: true },
+  });
+  try {
+    await w.loadURL('http://localhost/');
+    await w.webContents.executeJavaScript(`document.getElementById('t').textContent = ${JSON.stringify(text)};
+      const c = document.getElementById('c'); c.textContent = ${JSON.stringify(i18n.t('Cancel'))}; c.onclick = () => window.close(); 0;`);
+    w.show();
+    w.focus();
+    const closed = new Promise((resolve) => w.once('closed', () => resolve({ error: 'cancelled' })));
+    const r = await Promise.race([w.webContents.executeJavaScript(`(async () => { try { ${HELPERS} ${script} } catch (e) { return { error: e.name + ': ' + e.message }; } })()`, true), closed]);
+    if (r?.error === 'cancelled' || /NotAllowedError|AbortError/.test(r?.error || '')) throw new Error(i18n.t('Security key prompt was cancelled or timed out.'));
+    if (r?.error) throw new Error(r.error);
+    return r;
+  } finally {
+    if (!w.isDestroyed()) w.destroy();
+  }
+}
+
+// Neuen Schlüssel registrieren; liefert die Credential-ID (base64url)
+async function register(parent) {
+  const r = await ceremony(parent, i18n.t('Touch your security key to register it.'), `
+    const cred = await navigator.credentials.create({ publicKey: {
+      challenge: crypto.getRandomValues(new Uint8Array(32)),
+      rp: { name: 'MrTerm', id: 'localhost' },
+      user: { id: crypto.getRandomValues(new Uint8Array(16)), name: 'MrTerm', displayName: 'MrTerm' },
+      pubKeyCredParams: [{ type: 'public-key', alg: -7 }, { type: 'public-key', alg: -8 }, { type: 'public-key', alg: -257 }],
+      authenticatorSelection: { userVerification: 'discouraged', residentKey: 'discouraged' },
+      timeout: 60000, extensions: { prf: {} },
+    } });
+    return { credId: b64(cred.rawId), prf: cred.getClientExtensionResults().prf?.enabled };`);
+  if (r.prf === false) throw new Error(i18n.t('This security key does not support the hmac-secret/PRF extension.'));
+  return r.credId;
+}
+
+// PRF-Wert für einen der Schlüssel abfragen. creds: [{ credId, prfSalt }] (base64url)
+// Liefert { credId, secret: Buffer(32) }
+async function derive(parent, creds, text) {
+  const r = await ceremony(parent, text || i18n.t('Touch your security key to unlock MrTerm.'), `
+    const creds = ${JSON.stringify(creds)};
+    const evalByCredential = Object.fromEntries(creds.map((c) => [c.credId, { first: unb64(c.prfSalt) }]));
+    const a = await navigator.credentials.get({ publicKey: {
+      challenge: crypto.getRandomValues(new Uint8Array(32)), rpId: 'localhost', timeout: 60000, userVerification: 'discouraged',
+      allowCredentials: creds.map((c) => ({ type: 'public-key', id: unb64(c.credId) })),
+      extensions: { prf: { evalByCredential } },
+    } });
+    const first = a.getClientExtensionResults().prf?.results?.first;
+    return { credId: b64(a.rawId), secret: first ? b64(first) : null };`);
+  if (!r.secret) throw new Error(i18n.t('This security key does not support the hmac-secret/PRF extension.'));
+  return { credId: r.credId, secret: Buffer.from(r.secret, 'base64url') };
+}
+
+module.exports = { register, derive };

src/main/firewall.js

@@ -0,0 +1,180 @@
+// Firewall entfernter Hosts über SSH einsehen und bearbeiten: UFW sowie iptables/ip6tables (Tabelle filter).
+// Braucht root: entweder als root angemeldet oder sudo mit dem gespeicherten Host-Passwort (über stdin).
+// Alle Werte aus der Oberfläche werden streng geprüft, bevor sie in einen Shell-Befehl gelangen.
+const i18n = require('../i18n');
+const { execOn } = require('./docker');
+
+const lastLine = (s) => String(s || '').split('\n').map((l) => l.trim()).filter(Boolean).slice(-1)[0] || '';
+const RX = {
+  port: /^\d{1,5}([:,]\d{1,5})*$/,
+  addr: /^(any|[0-9a-fA-F.:]+(\/\d{1,3})?)$/,
+  comment: /^[^'"\\`$\n]{0,80}$/,
+  chain: /^[A-Za-z0-9_.-]{1,40}$/,
+  iface: /^[A-Za-z0-9_.@-]{1,15}\+?$/,
+};
+const check = (v, rx, what) => { if (!rx.test(String(v))) throw new Error(i18n.t('Invalid value for {field}: {value}', { field: what, value: v })); return String(v); };
+
+// UFW-Regeln aus `ufw status numbered`
+function parseUfw(out) {
+  const status = /Status:\s*active/i.test(out) ? 'active' : 'inactive';
+  const rules = [];
+  for (const line of out.split('\n')) {
+    const m = line.match(/^\[\s*(\d+)\]\s+(.+?)\s{2,}(ALLOW|DENY|REJECT|LIMIT)(?:\s+(IN|OUT|FWD))?\s+(.+?)\s*$/);
+    if (!m) continue;
+    let [, num, to, action, dir, from] = m;
+    let comment = '';
+    const c = from.match(/^(.*?)\s+#\s*(.*)$/);
+    if (c) { from = c[1].trim(); comment = c[2]; }
+    rules.push({ num: Number(num), to: to.trim(), action, dir: dir || 'IN', from: from.trim(), comment, v6: /\(v6\)/.test(to + from) });
+  }
+  return { status, rules };
+}
+
+// iptables -S: Richtlinien, Ketten und Regeln (Nummer = Position in der Kette)
+function parseIptables(out) {
+  const chains = new Map();
+  const get = (n) => { if (!chains.has(n)) chains.set(n, { name: n, policy: null, rules: [] }); return chains.get(n); };
+  for (const line of out.split('\n')) {
+    let m;
+    if ((m = line.match(/^-P (\S+) (\S+)/))) get(m[1]).policy = m[2];
+    else if ((m = line.match(/^-N (\S+)/))) get(m[1]);
+    else if ((m = line.match(/^-A (\S+) (.*)$/))) { const c = get(m[1]); c.rules.push({ num: c.rules.length + 1, spec: m[2] }); }
+  }
+  return [...chains.values()];
+}
+
+class FirewallManager {
+  constructor(ssh) {
+    this.ssh = ssh;
+    this.sessions = new Map(); // id -> { conn, jumps, host, sudo, tools }
+  }
+
+  get(id) {
+    const s = this.sessions.get(id);
+    if (!s) throw new Error(i18n.t('Firewall session not found'));
+    return s;
+  }
+
+  // Befehl mit root-Rechten ausführen
+  run(s, cmd) {
+    if (!s.sudo) return execOn(s.conn, `PATH=$PATH:/usr/sbin:/sbin ${cmd}`);
+    return execOn(s.conn, `sudo -S -p '' ${cmd}`, `${s.host.password || ''}\n`);
+  }
+  async runOk(s, cmd) {
+    const r = await this.run(s, cmd);
+    if (r.code) throw new Error(lastLine(r.err) || lastLine(r.out) || i18n.t('Command failed with code {code}', { code: r.code }));
+    return r.out;
+  }
+
+  async open(id, host, onClose) {
+    const { conn, jumps } = await this.ssh.connect(host, id);
+    const s = { conn, jumps, host, sudo: false, tools: [] };
+    this.sessions.set(id, s);
+    conn.on('close', () => { if (this.sessions.has(id)) { this.close(id); onClose(); } });
+    conn.on('error', () => {});
+    const uid = (await execOn(conn, 'id -u')).out.trim();
+    if (uid !== '0') {
+      s.sudo = true;
+      const r = await execOn(conn, "sudo -S -p '' -v", `${host.password || ''}\n`);
+      if (r.code) throw new Error(i18n.t('Root privileges are required. Log in as root or save the password of a user with sudo rights on the host.'));
+    }
+    const t = await this.run(s, 'sh -c \'for c in ufw iptables ip6tables firewall-cmd; do command -v $c >/dev/null 2>&1 && echo $c; done; true\'');
+    s.tools = t.out.split('\n').map((x) => x.trim()).filter(Boolean);
+    if (!s.tools.includes('ufw') && !s.tools.includes('iptables')) {
+      throw new Error(s.tools.includes('firewall-cmd') ? i18n.t('This host uses firewalld, which is not supported yet.') : i18n.t('Neither UFW nor iptables was found on this host.'));
+    }
+    return { tools: s.tools, sudo: s.sudo };
+  }
+
+  async list(id, backend) {
+    const s = this.get(id);
+    if (backend === 'ufw') {
+      const out = await this.runOk(s, 'ufw status numbered');
+      const verbose = await this.runOk(s, 'ufw status verbose');
+      const def = verbose.match(/Default:\s*(\w+)\s*\(incoming\),\s*(\w+)\s*\(outgoing\)(?:,\s*(\w+)\s*\(routed\))?/i);
+      return { ...parseUfw(out), defaults: def ? { incoming: def[1], outgoing: def[2], routed: def[3] || '' } : null };
+    }
+    const bin = backend === 'ip6tables' ? 'ip6tables' : 'iptables';
+    return { chains: parseIptables(await this.runOk(s, `${bin} -S`)) };
+  }
+
+  async ufw(id, op, a = {}) {
+    const s = this.get(id);
+    switch (op) {
+      case 'enable': return this.runOk(s, 'ufw --force enable');
+      case 'disable': return this.runOk(s, 'ufw disable');
+      case 'delete': return this.runOk(s, `ufw --force delete ${Number(a.num)}`);
+      case 'default': {
+        const pol = check(a.policy, /^(allow|deny|reject)$/, 'policy');
+        const dir = check(a.dir, /^(incoming|outgoing|routed)$/, 'direction');
+        return this.runOk(s, `ufw default ${pol} ${dir}`);
+      }
+      case 'add': {
+        const action = check(a.action, /^(allow|deny|reject|limit)$/, 'action');
+        const dir = check(a.dir || 'in', /^(in|out)$/, 'direction');
+        const from = check(a.from || 'any', RX.addr, 'from');
+        const to = check(a.to || 'any', RX.addr, 'to');
+        const parts = ['ufw', a.top ? 'insert 1' : '', action, dir];
+        if (a.port) {
+          check(a.port, RX.port, 'port');
+          const proto = check(a.proto || 'any', /^(any|tcp|udp)$/, 'protocol');
+          // Portbereiche/-listen verlangen bei UFW ein Protokoll
+          if (/[:,]/.test(a.port) && proto === 'any') throw new Error(i18n.t('Port ranges and lists need a protocol (TCP or UDP).'));
+          if (proto !== 'any') parts.push('proto', proto);
+          parts.push('from', from, 'to', to, 'port', a.port);
+        } else parts.push('from', from, 'to', to);
+        if (a.comment) parts.push('comment', `'${check(a.comment, RX.comment, 'comment')}'`);
+        return this.runOk(s, parts.filter(Boolean).join(' '));
+      }
+      default: throw new Error('Invalid operation');
+    }
+  }
+
+  async ipt(id, op, a = {}) {
+    const s = this.get(id);
+    const bin = a.family === 6 ? 'ip6tables' : 'iptables';
+    switch (op) {
+      case 'delete': return this.runOk(s, `${bin} -D ${check(a.chain, RX.chain, 'chain')} ${Number(a.num)}`);
+      case 'policy': return this.runOk(s, `${bin} -P ${check(a.chain, /^(INPUT|OUTPUT|FORWARD)$/, 'chain')} ${check(a.policy, /^(ACCEPT|DROP)$/, 'policy')}`);
+      case 'add': {
+        const parts = [bin, a.top ? '-I' : '-A', check(a.chain, RX.chain, 'chain')];
+        const proto = check(a.proto || 'all', /^(all|tcp|udp|icmp|icmpv6)$/, 'protocol');
+        if (proto !== 'all') parts.push('-p', proto);
+        if (a.source && a.source !== 'any') parts.push('-s', check(a.source, RX.addr, 'source'));
+        if (a.iface) parts.push(a.chain === 'OUTPUT' ? '-o' : '-i', check(a.iface, RX.iface, 'interface'));
+        if (a.port) {
+          check(a.port, RX.port, 'port');
+          if (proto !== 'tcp' && proto !== 'udp') throw new Error(i18n.t('A port needs the protocol TCP or UDP.'));
+          if (a.port.includes(',')) parts.push('-m', 'multiport', '--dports', a.port);
+          else parts.push('--dport', a.port);
+        }
+        if (a.state) parts.push('-m', 'conntrack', '--ctstate', check(a.state, /^[A-Z,]+$/, 'state'));
+        if (a.comment) parts.push('-m', 'comment', '--comment', `'${check(a.comment, RX.comment, 'comment')}'`);
+        parts.push('-j', check(a.target, /^(ACCEPT|DROP|REJECT|LOG|RETURN)$/, 'target'));
+        return this.runOk(s, parts.join(' '));
+      }
+      case 'save': {
+        // Dauerhaft speichern: Debian/Ubuntu (netfilter-persistent bzw. rules.v4/v6) oder Arch (iptables.rules)
+        const script = 'if command -v netfilter-persistent >/dev/null 2>&1; then netfilter-persistent save; '
+          + 'elif [ -f /etc/debian_version ] && [ -d /etc/iptables ]; then iptables-save > /etc/iptables/rules.v4 && ip6tables-save > /etc/iptables/rules.v6; '
+          + 'elif [ -d /etc/iptables ]; then iptables-save > /etc/iptables/iptables.rules && ip6tables-save > /etc/iptables/ip6tables.rules; '
+          + 'else exit 3; fi';
+        const r = await this.run(s, `sh -c '${script}'`);
+        if (r.code === 3) throw new Error(i18n.t('No known way to save iptables rules on this host (e.g. install iptables-persistent).'));
+        if (r.code) throw new Error(lastLine(r.err) || i18n.t('Command failed with code {code}', { code: r.code }));
+        return true;
+      }
+      default: throw new Error('Invalid operation');
+    }
+  }
+
+  close(id) {
+    const s = this.sessions.get(id);
+    if (!s) return;
+    this.sessions.delete(id);
+    try { s.conn.end(); } catch {}
+    s.jumps?.forEach((c) => { try { c.end(); } catch {} });
+  }
+}
+
+module.exports = { FirewallManager, parseUfw, parseIptables };

src/main/main.js

@@ -10,6 +10,11 @@ const rdp = require('./rdp');
 const { Updater } = require('./updater');
 const { createEmbed, embedSupported } = require('./rdp-embed');
 const i18n = require('../i18n');
+const fido = require('./fido');
+const { VpnManager } = require('./vpn');
+const { DockerManager } = require('./docker');
+const { FirewallManager } = require('./firewall');
+const { NetworkConfigManager } = require('./network');
 const applyLanguage = () => i18n.setLanguage(store.get().settings.language, app.getLocale());
 
 let win;
@@ -27,6 +32,13 @@ if (process.platform === 'linux' && readLaunch().x11 !== false && !process.argv.
 }
 const pendingSecrets = new Map();
 
+// Sicherheitsnetz: unerwartete Fehler (z. B. aus Netzwerkbibliotheken) als Meldung anzeigen statt den Hauptprozess abstürzen zu lassen
+process.on('uncaughtException', (e) => {
+  console.error('Uncaught exception:', e);
+  send('toast', e?.message || String(e), 'error');
+});
+process.on('unhandledRejection', (e) => console.error('Unhandled rejection:', e));
+
 function send(channel, ...args) {
   if (win && !win.isDestroyed()) win.webContents.send(channel, ...args);
 }
@@ -58,6 +70,10 @@ function askSecret(sessionId, req) {
 
 const ssh = new SshManager(store, confirmHostKey, askSecret);
 const updater = new Updater(store, send);
+const vpn = new VpnManager(store, app.getPath('userData'));
+const docker = new DockerManager(ssh);
+const firewall = new FirewallManager(ssh);
+const network = new NetworkConfigManager(ssh);
 
 function createWindow() {
   win = new BrowserWindow({
@@ -88,9 +104,14 @@ function createWindow() {
   win.webContents.setWindowOpenHandler(({ url }) => { shell.openExternal(url); return { action: 'deny' }; });
 }
 
+// Solange MrTerm gesperrt ist, sind nur die Sperr-Kanäle erreichbar
+const OPEN_WHILE_LOCKED = new Set(['app:version']);
 function handle(channel, fn) {
   ipcMain.handle(channel, async (_e, ...args) => {
-    try { return { ok: true, value: await fn(...args) }; }
+    try {
+      if (store.locked && !channel.startsWith('lock:') && !OPEN_WHILE_LOCKED.has(channel)) throw new Error(i18n.t('MrTerm is locked.'));
+      return { ok: true, value: await fn(...args) };
+    }
     catch (e) { return { ok: false, error: e.message || String(e) }; }
   });
 }
@@ -100,10 +121,134 @@ ipcMain.on('win:min', () => win.minimize());
 ipcMain.on('win:max', () => (win.isMaximized() ? win.unmaximize() : win.maximize()));
 ipcMain.on('win:close', () => win.close());
 
+// ---------- App-Sperre (Passwort / FIDO2) ----------
+const kdf = (pw, salt, N) => new Promise((resolve, reject) =>
+  crypto.scrypt(String(pw), salt, 32, { N, r: 8, p: 1, maxmem: 256 * N * 8 }, (e, k) => (e ? reject(e) : resolve(k))));
+const fidoKek = (secret) => Buffer.from(crypto.hkdfSync('sha256', secret, Buffer.alloc(0), 'mrterm-fido-kek', 32));
+function lockStatus() {
+  const { language, appTheme, accent } = store.get().settings;
+  return {
+    enabled: store.lockEnabled, locked: store.locked, hasPassword: !!store.lock?.password,
+    fido: (store.lock?.fido || []).map(({ id, label }) => ({ id, label })), meta: { language, appTheme, accent },
+  };
+}
+function requireUnlocked() { if (store.locked) throw new Error(i18n.t('MrTerm is locked.')); }
+const ensureLock = () => (store.lock = store.lock || { password: null, fido: [] });
+function afterUnlock() { applyLanguage(); scheduleUpdateCheck(); }
+
+handle('lock:status', lockStatus);
+handle('lock:lock', () => { if (store.lockEnabled) store.locked = true; return lockStatus(); });
+handle('lock:unlockPassword', async (pw) => {
+  const p = store.lock?.password;
+  if (!p) throw new Error(i18n.t('No password set.'));
+  const kek = await kdf(pw, Buffer.from(p.salt, 'base64'), p.N);
+  try { store.unlockWith(kek, p.wrap); } catch { throw new Error(i18n.t('Wrong password.')); }
+  afterUnlock();
+  return true;
+});
+handle('lock:unlockFido', async () => {
+  const list = store.lock?.fido || [];
+  if (!list.length) throw new Error(i18n.t('No security key registered.'));
+  const r = await fido.derive(win, list.map(({ credId, prfSalt }) => ({ credId, prfSalt })));
+  const entry = list.find((f) => f.credId === r.credId);
+  if (!entry) throw new Error(i18n.t('Unknown security key.'));
+  try { store.unlockWith(fidoKek(r.secret), entry.wrap); } catch { throw new Error(i18n.t('This security key could not unlock the vault.')); }
+  afterUnlock();
+  return true;
+});
+handle('lock:setPassword', async (pw) => {
+  requireUnlocked();
+  if (!pw || String(pw).length < 6) throw new Error(i18n.t('The password must be at least 6 characters long.'));
+  const salt = crypto.randomBytes(16), N = 2 ** 15;
+  const kek = await kdf(pw, salt, N);
+  ensureLock().password = { salt: salt.toString('base64'), N, wrap: store.wrapDek(kek) };
+  store.save();
+  return lockStatus();
+});
+handle('lock:removePassword', () => {
+  requireUnlocked();
+  if (store.lock) store.lock.password = null;
+  store.dropLockIfEmpty();
+  store.save();
+  return lockStatus();
+});
+handle('lock:addFido', async (label) => {
+  requireUnlocked();
+  const credId = await fido.register(win);
+  const prfSalt = crypto.randomBytes(32).toString('base64url');
+  const r = await fido.derive(win, [{ credId, prfSalt }], i18n.t('Touch your security key again to finish.'));
+  ensureLock().fido.push({ id: crypto.randomUUID(), label: label || i18n.t('Security key'), credId, prfSalt, wrap: store.wrapDek(fidoKek(r.secret)) });
+  store.save();
+  return lockStatus();
+});
+handle('lock:removeFido', (id) => {
+  requireUnlocked();
+  if (store.lock) store.lock.fido = store.lock.fido.filter((f) => f.id !== id);
+  store.dropLockIfEmpty();
+  store.save();
+  return lockStatus();
+});
+
 // ---------- Vault ----------
 handle('vault:get', () => ({ ...store.get(), encrypted: store.encrypted, platform: process.platform }));
-handle('vault:upsert', (col, item) => store.upsert(col, item));
+handle('vault:upsert', async (col, item) => {
-handle('vault:remove', (col, id) => store.remove(col, id));
+  // Geänderte VPN-Konfiguration: alte Systemverbindung entfernen, beim nächsten Verbinden neu importieren
+  if (col === 'vpns' && item.id) {
+    const old = store.get().vpns.find((v) => v.id === item.id);
+    if (old && ['type', 'config', 'username', 'password'].some((k) => (old[k] || '') !== (item[k] || ''))) await vpn.forget(old);
+  }
+  return store.upsert(col, item);
+});
+handle('vault:remove', async (col, id) => {
+  if (col === 'vpns') {
+    await vpn.forget(store.get().vpns.find((v) => v.id === id));
+    store.get().hosts.forEach((h) => { if (h.vpnId === id) h.vpnId = null; });
+  }
+  return store.remove(col, id);
+});
+
+// ---------- Docker ----------
+handle('docker:open', async (id, hostRef) => {
+  const host = hostWithOverrides(hostRef);
+  if (await vpn.ensureForHost(host)) send('vpn:changed');
+  return docker.open(id, host, () => send('docker:closed', id));
+});
+handle('docker:list', (id) => docker.list(id));
+handle('docker:stats', (id) => docker.stats(id));
+handle('docker:action', (id, action, cid) => docker.action(id, action, cid));
+handle('docker:command', (id, kind, cid) => docker.command(id, kind, cid));
+handle('docker:close', (id) => docker.close(id));
+
+// ---------- Firewall ----------
+handle('firewall:open', async (id, hostRef) => {
+  const host = hostWithOverrides(hostRef);
+  if (await vpn.ensureForHost(host)) send('vpn:changed');
+  return firewall.open(id, host, () => send('firewall:closed', id));
+});
+handle('firewall:list', (id, backend) => firewall.list(id, backend));
+handle('firewall:ufw', (id, op, args) => firewall.ufw(id, op, args));
+handle('firewall:ipt', (id, op, args) => firewall.ipt(id, op, args));
+handle('firewall:close', (id) => firewall.close(id));
+
+// ---------- Netzwerk ----------
+handle('network:open', async (id, hostRef) => {
+  const host = hostWithOverrides(hostRef);
+  if (await vpn.ensureForHost(host)) send('vpn:changed');
+  return network.open(id, host, () => send('network:closed', id));
+});
+handle('network:read', (id) => network.read(id));
+handle('network:save', (id, model, verify) => network.saveInterface(id, model, verify));
+handle('network:remove', (id, model) => network.removeInterface(id, model));
+handle('network:hostname', (id, name) => network.setHostname(id, name));
+handle('network:resolv', (id, servers, search) => network.setResolv(id, servers, search));
+handle('network:readFile', (id, path) => network.readFile(id, path));
+handle('network:writeFile', (id, path, content, verify) => network.writeFile(id, path, content, verify));
+handle('network:close', (id) => network.close(id));
+
+// ---------- VPN ----------
+handle('vpn:status', () => vpn.status());
+handle('vpn:up', (id) => vpn.up(id));
+handle('vpn:down', (id) => vpn.down(id));
 handle('vault:settings', (s) => {
   store.setSettings(s);
   if ('language' in s) applyLanguage();
@@ -194,12 +339,16 @@ function hostWithOverrides(hostOrId) {
     if (!h) throw new Error(i18n.t('Host not found'));
     return h;
   }
+  // Gespeicherter Host mit Zusätzen, z. B. { ref, execCommand } für Container-Shells
+  if (hostOrId?.ref) return { ...hostWithOverrides(hostOrId.ref), execCommand: hostOrId.execCommand, label: hostOrId.label };
   return hostOrId; // Quick-Connect: temporärer Host
 }
 
 handle('ssh:open', async (sessionId, hostRef, size) => {
   const host = hostWithOverrides(hostRef);
-  if (host.id) store.addHistory({ hostId: host.id, at: Date.now() });
+  if (host.id && !host.execCommand) store.addHistory({ hostId: host.id, at: Date.now() });
+  const onEvent = (type, payload) => send('ssh:event', sessionId, type, payload);
+  if (await vpn.ensureForHost(host, (m) => onEvent('status', m))) send('vpn:changed');
   await ssh.openShell(sessionId, host, size, (type, payload) => send('ssh:event', sessionId, type, payload));
   return true;
 });
@@ -212,7 +361,11 @@ ipcMain.on('secret:reply', (_e, reqId, value) => {
 });
 
 // ---------- SFTP ----------
-handle('sftp:open', (sessionId, hostRef) => ssh.openSftp(sessionId, hostWithOverrides(hostRef)));
+handle('sftp:open', async (sessionId, hostRef) => {
+  const host = hostWithOverrides(hostRef);
+  if (await vpn.ensureForHost(host)) send('vpn:changed');
+  return ssh.openSftp(sessionId, host);
+});
 handle('sftp:list', (id, dir) => ssh.sftpList(id, dir));
 handle('sftp:op', (id, op, a, b) => ssh.sftpOp(id, op, a, b));
 handle('sftp:transfer', async (id, dir, localPath, remotePath, transferId) => {
@@ -246,9 +399,10 @@ handle('local:op', (op, a, b) => {
 });
 
 // ---------- Port-Forwarding ----------
-handle('fw:start', (id) => {
+handle('fw:start', async (id) => {
   const fw = store.get().forwards.find((f) => f.id === id);
   if (!fw) throw new Error(i18n.t('Rule not found'));
+  if (await vpn.ensureForHost(store.resolveHost(fw.hostId))) send('vpn:changed');
   return ssh.startForward(fw, (ev) => send('fw:event', id, ev));
 });
 handle('fw:stop', (id) => ssh.stopForward(id));
@@ -256,8 +410,9 @@ handle('fw:active', () => ssh.activeForwards());
 
 // ---------- RDP ----------
 handle('rdp:detect', () => rdp.detect(store.get().settings));
-handle('rdp:launch', (hostId) => {
+handle('rdp:launch', async (hostId) => {
   const host = hostWithOverrides(hostId);
+  if (await vpn.ensureForHost(host)) send('vpn:changed');
   if (host.id) store.addHistory({ hostId: host.id, at: Date.now() });
   const r = rdp.launch(host, store.get().settings);
   if (r.process) {
@@ -277,6 +432,7 @@ handle('rdp:embedSupported', () => {
 handle('rdp:open', async (id, hostRef, bounds) => {
   const host = hostWithOverrides(hostRef);
   if (host.id) store.addHistory({ hostId: host.id, at: Date.now() });
+  if (await vpn.ensureForHost(host)) send('vpn:changed');
   const emb = createEmbed(win.getNativeWindowHandle());
   const sess = { emb, cancelled: false };
   rdpSessions.set(id, sess);
@@ -369,11 +525,17 @@ app.whenReady().then(() => {
   store.load();
   applyLanguage();
   createWindow();
-  if (store.get().settings.updateAutoCheck && app.isPackaged) {
+  scheduleUpdateCheck();
-    setTimeout(() => updater.check().then((r) => { if (r.available) send('update:available', r); }).catch(() => {}), 6000);
-  }
 });
-app.on('window-all-closed', () => { ssh.closeAll(); app.quit(); });
+
+// Automatische Update-Prüfung – bei gesperrtem Vault erst nach dem Entsperren (Einstellungen sind verschlüsselt)
+let updateScheduled = false;
+function scheduleUpdateCheck() {
+  if (updateScheduled || store.sealed || !store.get().settings.updateAutoCheck || !app.isPackaged) return;
+  updateScheduled = true;
+  setTimeout(() => updater.check().then((r) => { if (r.available) send('update:available', r); }).catch(() => {}), 6000);
+}
+app.on('window-all-closed', async () => { ssh.closeAll(); await vpn.downOnQuit(); app.quit(); });
 
 // Smoke-Test: MRTERM_SMOKE=<pfad.png> startet, loggt Renderer-Meldungen, speichert einen Screenshot und beendet.
 if (process.env.MRTERM_SMOKE) {

src/main/netconf.js

@@ -0,0 +1,346 @@
+// Netzwerk-Konfiguration als einheitliches Modell – Lesen/Schreiben für
+//   Ubuntu: netplan (YAML, hier als JSON verarbeitet; JSON ist gültiges YAML)
+//   Debian/Proxmox: ifupdown / ifupdown2 (/etc/network/interfaces + interfaces.d)
+// Modell pro Schnittstelle:
+//   { name, kind: ethernet|bond|bridge|vlan, method4: dhcp|static|none, addresses[], gateway, dns[], search[], mtu,
+//     method6: auto|dhcp|static|none, addresses6[], gateway6,
+//     bond: { members[], mode, lacpRate, hashPolicy, miimon }, bridge: { members[], stp }, vlan: { id, link }, file }
+// Reine Funktionen ohne Seiteneffekte (lokal testbar).
+
+const RX = {
+  name: /^[a-zA-Z0-9_.:-]{1,15}$/,
+  cidr4: /^(\d{1,3})(\.\d{1,3}){3}\/\d{1,2}$/,
+  cidr6: /^[0-9a-fA-F:]+(%\w+)?\/\d{1,3}$/,
+  ip4: /^\d{1,3}(\.\d{1,3}){3}$/,
+  ip6: /^[0-9a-fA-F:]+$/,
+  domain: /^[a-zA-Z0-9.-]{1,253}$/,
+};
+const BOND_MODES = ['balance-rr', 'active-backup', 'balance-xor', 'broadcast', '802.3ad', 'balance-tlb', 'balance-alb'];
+const HASH = ['layer2', 'layer2+3', 'layer3+4', 'encap2+3', 'encap3+4'];
+
+function fail(msg) { const e = new Error(msg); e.validation = true; throw e; }
+
+// Eingaben prüfen, bevor daraus Konfigurationsdateien entstehen
+function validate(m, t = (s, v) => (v ? s.replace(/\{(\w+)\}/g, (x, k) => v[k]) : s)) {
+  const chk = (ok, field, value) => { if (!ok) fail(t('Invalid value for {field}: {value}', { field, value })); };
+  chk(RX.name.test(m.name || ''), 'name', m.name);
+  chk(['ethernet', 'bond', 'bridge', 'vlan'].includes(m.kind), 'kind', m.kind);
+  chk(['dhcp', 'static', 'none'].includes(m.method4), 'IPv4', m.method4);
+  chk(['auto', 'dhcp', 'static', 'none'].includes(m.method6), 'IPv6', m.method6);
+  for (const a of m.addresses || []) chk(RX.cidr4.test(a), 'IPv4 address', a);
+  for (const a of m.addresses6 || []) chk(RX.cidr6.test(a), 'IPv6 address', a);
+  if (m.method4 === 'static' && !(m.addresses || []).length) fail(t('A static configuration needs at least one IPv4 address (e.g. 192.168.1.10/24).'));
+  if (m.method6 === 'static' && !(m.addresses6 || []).length) fail(t('A static IPv6 configuration needs at least one IPv6 address.'));
+  if (m.gateway) chk(RX.ip4.test(m.gateway), 'gateway', m.gateway);
+  if (m.gateway6) chk(RX.ip6.test(m.gateway6), 'IPv6 gateway', m.gateway6);
+  for (const d of m.dns || []) chk(RX.ip4.test(d) || RX.ip6.test(d), 'DNS', d);
+  for (const d of m.search || []) chk(RX.domain.test(d), 'search domain', d);
+  if (m.mtu !== '' && m.mtu != null) chk(Number(m.mtu) >= 68 && Number(m.mtu) <= 65535, 'MTU', m.mtu);
+  if (m.kind === 'bond') {
+    chk(BOND_MODES.includes(m.bond?.mode), 'bond mode', m.bond?.mode);
+    for (const x of m.bond.members || []) chk(RX.name.test(x), 'member', x);
+    if (m.bond.lacpRate) chk(['slow', 'fast'].includes(m.bond.lacpRate), 'LACP rate', m.bond.lacpRate);
+    if (m.bond.hashPolicy) chk(HASH.includes(m.bond.hashPolicy), 'hash policy', m.bond.hashPolicy);
+    if (m.bond.miimon !== '' && m.bond.miimon != null) chk(/^\d{1,5}$/.test(String(m.bond.miimon)), 'miimon', m.bond.miimon);
+  }
+  if (m.kind === 'bridge') for (const x of m.bridge?.members || []) chk(RX.name.test(x), 'port', x);
+  if (m.kind === 'vlan') {
+    chk(Number(m.vlan?.id) >= 1 && Number(m.vlan?.id) <= 4094, 'VLAN ID', m.vlan?.id);
+    chk(RX.name.test(m.vlan?.link || ''), 'VLAN parent', m.vlan?.link);
+  }
+  return m;
+}
+
+const blank = (name, kind = 'ethernet') => ({
+  name, kind, method4: 'none', addresses: [], gateway: '', dns: [], search: [], mtu: '',
+  method6: 'auto', addresses6: [], gateway6: '',
+  bond: kind === 'bond' ? { members: [], mode: '802.3ad', lacpRate: 'fast', hashPolicy: 'layer3+4', miimon: 100 } : undefined,
+  bridge: kind === 'bridge' ? { members: [], stp: false } : undefined,
+  vlan: kind === 'vlan' ? { id: '', link: '' } : undefined,
+});
+
+// ======================================================================= netplan
+const NP_SECT = { ethernet: 'ethernets', bond: 'bonds', bridge: 'bridges', vlan: 'vlans' };
+const DEFAULT_ROUTE = (r) => ['default', '0.0.0.0/0', '::/0'].includes(r?.to);
+const addrOf = (a) => (typeof a === 'string' ? a : Object.keys(a || {})[0] || '');
+
+function fromNetplan(cfg) {
+  const net = cfg?.network || {};
+  const out = [];
+  for (const [kind, sect] of Object.entries(NP_SECT)) {
+    for (const [name, c] of Object.entries(net[sect] || {})) {
+      const m = blank(name, kind);
+      const addrs = (c.addresses || []).map(addrOf);
+      m.addresses = addrs.filter((a) => !a.includes(':'));
+      m.addresses6 = addrs.filter((a) => a.includes(':'));
+      const routes = c.routes || [];
+      m.gateway = c.gateway4 || routes.find((r) => DEFAULT_ROUTE(r) && !String(r.via).includes(':'))?.via || '';
+      m.gateway6 = c.gateway6 || routes.find((r) => DEFAULT_ROUTE(r) && String(r.via).includes(':'))?.via || '';
+      m.method4 = c.dhcp4 === true || c.dhcp4 === 'yes' || c.dhcp4 === 'true' ? 'dhcp' : m.addresses.length ? 'static' : 'none';
+      m.method6 = c.dhcp6 === true || c.dhcp6 === 'yes' ? 'dhcp' : m.addresses6.length ? 'static' : c['accept-ra'] === false ? 'none' : 'auto';
+      m.dns = c.nameservers?.addresses || [];
+      m.search = c.nameservers?.search || [];
+      m.mtu = c.mtu ?? '';
+      const p = c.parameters || {};
+      if (kind === 'bond') m.bond = { members: c.interfaces || [], mode: p.mode || 'balance-rr', lacpRate: p['lacp-rate'] || '', hashPolicy: p['transmit-hash-policy'] || '', miimon: p['mii-monitor-interval'] ?? '' };
+      if (kind === 'bridge') m.bridge = { members: c.interfaces || [], stp: p.stp === true };
+      if (kind === 'vlan') m.vlan = { id: c.id ?? '', link: c.link || '' };
+      out.push(m);
+    }
+  }
+  return out;
+}
+
+// Mitglieder aus allen Bonds/Bridges außer "keep" entfernen
+function npDetach(net, members, keepSect, keepName) {
+  for (const sect of ['bonds', 'bridges']) {
+    for (const [n, c] of Object.entries(net[sect] || {})) {
+      if (sect === keepSect && n === keepName) continue;
+      if (Array.isArray(c.interfaces)) c.interfaces = c.interfaces.filter((x) => !members.includes(x));
+    }
+  }
+}
+
+// Modell m in die netplan-Konfiguration übernehmen (liefert neue Konfiguration)
+function applyNetplan(cfg, m, { remove = false } = {}) {
+  const out = structuredClone(cfg || {});
+  const net = (out.network ||= { version: 2 });
+  net.version ||= 2;
+  const sect = NP_SECT[m.kind];
+  if (remove) {
+    if (net[sect]) delete net[sect][m.name];
+    npDetach(net, [m.name]);
+    return out;
+  }
+  const c = ((net[sect] ||= {})[m.name] ||= {});
+  delete c.gateway4; delete c.gateway6;
+  c.dhcp4 = m.method4 === 'dhcp';
+  if (m.method6 === 'dhcp') c.dhcp6 = true; else delete c.dhcp6;
+  if (m.method6 === 'none') { c['accept-ra'] = false; c['link-local'] = ['ipv4']; }
+  else { if (c['accept-ra'] === false) delete c['accept-ra']; if (Array.isArray(c['link-local']) && !c['link-local'].includes('ipv6')) delete c['link-local']; }
+  const addrs = [...(m.method4 === 'static' ? m.addresses : []), ...(m.method6 === 'static' ? m.addresses6 : [])];
+  if (addrs.length) c.addresses = addrs; else delete c.addresses;
+  const routes = (c.routes || []).filter((r) => !DEFAULT_ROUTE(r));
+  if (m.method4 === 'static' && m.gateway) routes.push({ to: 'default', via: m.gateway });
+  if (m.method6 === 'static' && m.gateway6) routes.push({ to: '::/0', via: m.gateway6 });
+  if (routes.length) c.routes = routes; else delete c.routes;
+  if ((m.dns || []).length || (m.search || []).length) c.nameservers = { ...((m.dns || []).length ? { addresses: m.dns } : {}), ...((m.search || []).length ? { search: m.search } : {}) };
+  else delete c.nameservers;
+  if (m.mtu !== '' && m.mtu != null) c.mtu = Number(m.mtu); else delete c.mtu;
+
+  const members = m.kind === 'bond' ? m.bond.members : m.kind === 'bridge' ? m.bridge.members : [];
+  if (m.kind === 'bond' || m.kind === 'bridge') {
+    c.interfaces = [...members];
+    npDetach(net, members, sect, m.name);
+    // Mitglieder dürfen selbst keine IP-Konfiguration haben
+    for (const x of members) {
+      const sub = Object.values(NP_SECT).map((s) => net[s]?.[x]).find(Boolean) || ((net.ethernets ||= {})[x] = {});
+      for (const k of ['addresses', 'routes', 'nameservers', 'gateway4', 'gateway6', 'dhcp6']) delete sub[k];
+      sub.dhcp4 = false;
+    }
+  }
+  if (m.kind === 'bond') {
+    const p = { ...(c.parameters || {}), mode: m.bond.mode };
+    if (m.bond.mode === '802.3ad' && m.bond.lacpRate) p['lacp-rate'] = m.bond.lacpRate; else delete p['lacp-rate'];
+    if (m.bond.hashPolicy && ['802.3ad', 'balance-xor', 'balance-tlb', 'balance-alb'].includes(m.bond.mode)) p['transmit-hash-policy'] = m.bond.hashPolicy; else delete p['transmit-hash-policy'];
+    if (m.bond.miimon !== '' && m.bond.miimon != null) p['mii-monitor-interval'] = Number(m.bond.miimon); else delete p['mii-monitor-interval'];
+    c.parameters = p;
+  }
+  if (m.kind === 'bridge') c.parameters = { ...(c.parameters || {}), stp: !!m.bridge.stp };
+  if (m.kind === 'vlan') { c.id = Number(m.vlan.id); c.link = m.vlan.link; }
+  return out;
+}
+
+// ======================================================================= ifupdown
+const KEYWORDS = /^(iface|auto|allow-[\w-]+|mapping|source|source-directory|rename|no-auto-down|no-scripts)\b/;
+// Optionen, die MrTerm selbst schreibt; alle anderen bleiben unverändert erhalten
+const MANAGED = new Set(['address', 'netmask', 'gateway', 'dns-nameservers', 'dns-search', 'mtu',
+  'bond-slaves', 'bond_slaves', 'slaves', 'bond-mode', 'bond_mode', 'bond-miimon', 'bond_miimon', 'bond-lacp-rate', 'bond_lacp_rate',
+  'bond-xmit-hash-policy', 'bond_xmit_hash_policy', 'bridge-ports', 'bridge_ports', 'bridge-stp', 'bridge_stp', 'vlan-raw-device', 'vlan-id', 'bond-master']);
+// IP-Optionen, die ein Bond-/Bridge-Mitglied nicht haben darf
+const IPKEYS = new Set(['address', 'netmask', 'gateway', 'dns-nameservers', 'dns-search']);
+
+function parseInterfaces(text, file) {
+  const blocks = [];
+  let cur = null;
+  for (const line of String(text).split('\n')) {
+    const t = line.trim();
+    if (KEYWORDS.test(t)) {
+      const [kw, ...rest] = t.split(/\s+/);
+      if (kw === 'iface') {
+        cur = { type: 'iface', name: rest[0], family: rest[1] || 'inet', method: rest[2] || 'manual', options: [], file };
+        blocks.push(cur);
+        continue;
+      }
+      cur = null;
+      if (kw === 'auto' || kw.startsWith('allow-')) { blocks.push({ type: 'auto', kw, names: rest, file }); continue; }
+      blocks.push({ type: 'raw', line, file });
+      continue;
+    }
+    if (cur && t && !t.startsWith('#')) {
+      const [key, ...v] = t.split(/\s+/);
+      cur.options.push({ key, value: v.join(' ') });
+      continue;
+    }
+    if (cur && t.startsWith('#')) { cur.options.push({ comment: line }); continue; }
+    if (!t) cur = null;
+    blocks.push({ type: 'raw', line, file });
+  }
+  return blocks;
+}
+
+const maskToPrefix = (mask) => String(mask).split('.').reduce((n, o) => n + (Number(o) >>> 0).toString(2).split('').filter((b) => b === '1').length, 0);
+
+function fromIfupdown(blocks) {
+  const byName = new Map();
+  const opt = (b, ...keys) => b?.options.filter((o) => keys.includes(o.key)).map((o) => o.value) || [];
+  for (const b of blocks.filter((x) => x.type === 'iface')) {
+    if (b.method === 'loopback' || b.name === 'lo') continue;
+    const e = byName.get(b.name) || { inet: null, inet6: null };
+    e[b.family === 'inet6' ? 'inet6' : 'inet'] = b;
+    byName.set(b.name, e);
+  }
+  // Mitglieder, die per bond-master auf einen Bond zeigen
+  const bondMasters = {};
+  for (const [name, e] of byName) { const bm = opt(e.inet, 'bond-master')[0]; if (bm) (bondMasters[bm] ||= []).push(name); }
+  const out = [];
+  for (const [name, { inet, inet6 }] of byName) {
+    const b = inet || inet6;
+    const slaves = opt(inet, 'bond-slaves', 'bond_slaves', 'slaves')[0];
+    const bridgePorts = opt(inet, 'bridge-ports', 'bridge_ports')[0];
+    const vlanDev = opt(inet, 'vlan-raw-device')[0] || opt(inet6, 'vlan-raw-device')[0];
+    const vm = name.match(/^(.+)\.(\d+)$/);
+    const kind = slaves !== undefined || opt(inet, 'bond-mode', 'bond_mode').length ? 'bond' : bridgePorts !== undefined ? 'bridge' : vlanDev || vm || /^vlan\d+$/.test(name) ? 'vlan' : 'ethernet';
+    const m = blank(name, kind);
+    m.file = b.file;
+    if (inet) {
+      m.method4 = inet.method === 'dhcp' ? 'dhcp' : inet.method === 'static' ? 'static' : 'none';
+      const mask = opt(inet, 'netmask')[0];
+      m.addresses = opt(inet, 'address').map((a) => (a.includes('/') ? a : `${a}/${mask ? maskToPrefix(mask) : 24}`));
+      m.gateway = opt(inet, 'gateway')[0] || '';
+      m.dns = (opt(inet, 'dns-nameservers')[0] || '').split(/\s+/).filter(Boolean);
+      m.search = (opt(inet, 'dns-search')[0] || '').split(/\s+/).filter(Boolean);
+      m.mtu = opt(inet, 'mtu')[0] || '';
+    }
+    if (inet6) {
+      m.method6 = inet6.method === 'dhcp' ? 'dhcp' : inet6.method === 'static' ? 'static' : inet6.method === 'auto' ? 'auto' : 'none';
+      m.addresses6 = opt(inet6, 'address').map((a) => (a.includes('/') ? a : `${a}/${opt(inet6, 'netmask')[0] || 64}`));
+      m.gateway6 = opt(inet6, 'gateway')[0] || '';
+    } else m.method6 = 'auto';
+    if (kind === 'bond') {
+      const members = slaves && slaves !== 'none' ? slaves.split(/\s+/) : bondMasters[name] || [];
+      m.bond = { members, mode: opt(inet, 'bond-mode', 'bond_mode')[0] || 'balance-rr', lacpRate: opt(inet, 'bond-lacp-rate', 'bond_lacp_rate')[0] || '',
+        hashPolicy: opt(inet, 'bond-xmit-hash-policy', 'bond_xmit_hash_policy')[0] || '', miimon: opt(inet, 'bond-miimon', 'bond_miimon')[0] || '' };
+      if (m.bond.lacpRate === '1') m.bond.lacpRate = 'fast';
+      if (m.bond.lacpRate === '0') m.bond.lacpRate = 'slow';
+      if (m.bond.mode === '4') m.bond.mode = '802.3ad';
+    }
+    if (kind === 'bridge') m.bridge = { members: bridgePorts && bridgePorts !== 'none' ? bridgePorts.split(/\s+/) : [], stp: /^(on|yes)$/.test(opt(inet, 'bridge-stp', 'bridge_stp')[0] || '') };
+    if (kind === 'vlan') m.vlan = { id: opt(inet, 'vlan-id')[0] || vm?.[2] || (name.match(/^vlan(\d+)$/) || [])[1] || '', link: vlanDev || vm?.[1] || '' };
+    out.push(m);
+  }
+  return out;
+}
+
+function ifaceLines(m, keep4 = [], keep6 = [], had6 = false) {
+  const L = [];
+  const o = (k, v) => L.push(`    ${k} ${v}`);
+  L.push(`iface ${m.name} inet ${m.method4 === 'dhcp' ? 'dhcp' : m.method4 === 'static' ? 'static' : 'manual'}`);
+  if (m.method4 === 'static') { m.addresses.forEach((a) => o('address', a)); if (m.gateway) o('gateway', m.gateway); }
+  if ((m.dns || []).length) o('dns-nameservers', m.dns.join(' '));
+  if ((m.search || []).length) o('dns-search', m.search.join(' '));
+  if (m.mtu !== '' && m.mtu != null) o('mtu', m.mtu);
+  if (m.kind === 'bond') {
+    o('bond-slaves', m.bond.members.length ? m.bond.members.join(' ') : 'none');
+    o('bond-mode', m.bond.mode);
+    if (m.bond.miimon !== '' && m.bond.miimon != null) o('bond-miimon', m.bond.miimon);
+    if (m.bond.mode === '802.3ad' && m.bond.lacpRate) o('bond-lacp-rate', m.bond.lacpRate);
+    if (m.bond.hashPolicy && ['802.3ad', 'balance-xor', 'balance-tlb', 'balance-alb'].includes(m.bond.mode)) o('bond-xmit-hash-policy', m.bond.hashPolicy);
+  }
+  if (m.kind === 'bridge') { o('bridge-ports', m.bridge.members.length ? m.bridge.members.join(' ') : 'none'); o('bridge-stp', m.bridge.stp ? 'on' : 'off'); }
+  if (m.kind === 'vlan' && !/^.+\.\d+$/.test(m.name)) { o('vlan-raw-device', m.vlan.link); o('vlan-id', m.vlan.id); }
+  keep4.forEach((x) => L.push(x.comment ?? `    ${x.key} ${x.value}`));
+  // inet6: dhcp/static immer; "auto" nur, wenn der Block vorher schon existierte (sonst Kernel-Standard SLAAC)
+  if (m.method6 === 'dhcp' || m.method6 === 'static' || (m.method6 === 'auto' && had6)) {
+    L.push('');
+    L.push(`iface ${m.name} inet6 ${m.method6}`);
+    if (m.method6 === 'static') { m.addresses6.forEach((a) => o('address', a)); if (m.gateway6) o('gateway', m.gateway6); }
+    keep6.forEach((x) => L.push(x.comment ?? `    ${x.key} ${x.value}`));
+  }
+  return L;
+}
+
+// Modell in die Blöcke übernehmen; liefert { files: { pfad: inhalt } } für alle geänderten Dateien
+function applyIfupdown(blocks, m, { remove = false, mainFile = '/etc/network/interfaces' } = {}) {
+  let bl = blocks.map((b) => ({ ...b, options: b.options ? [...b.options] : undefined, names: b.names ? [...b.names] : undefined }));
+  const changed = new Set();
+  const file = bl.find((b) => b.type === 'iface' && b.name === m.name)?.file || m.file || mainFile;
+  const members = m.kind === 'bond' ? m.bond.members : m.kind === 'bridge' ? m.bridge.members : [];
+
+  // bestehende Blöcke der Schnittstelle entfernen (Position merken)
+  const old = bl.filter((b) => b.type === 'iface' && b.name === m.name);
+  old.forEach((b) => changed.add(b.file));
+  const keep4 = (old.find((b) => b.family !== 'inet6')?.options || []).filter((x) => x.comment || !MANAGED.has(x.key));
+  const keep6 = (old.find((b) => b.family === 'inet6')?.options || []).filter((x) => x.comment || !MANAGED.has(x.key));
+  let pos = bl.findIndex((b) => b.type === 'iface' && b.name === m.name);
+  bl = bl.filter((b) => !(b.type === 'iface' && b.name === m.name));
+  if (remove) {
+    bl.forEach((b) => { if (b.type === 'auto' && b.names.includes(m.name)) { b.names = b.names.filter((n) => n !== m.name); changed.add(b.file); } });
+    bl = bl.filter((b) => !(b.type === 'auto' && !b.names.length));
+  } else {
+    changed.add(file);
+    if (pos < 0) { bl.push({ type: 'raw', line: '', file }); pos = bl.length; }
+    const hasAuto = bl.some((b) => b.type === 'auto' && b.names.includes(m.name));
+    const nb = [];
+    if (!hasAuto) nb.push({ type: 'auto', kw: 'auto', names: [m.name], file });
+    nb.push({ type: 'text', lines: ifaceLines(m, keep4, keep6, old.some((b) => b.family === 'inet6')), file });
+    bl.splice(pos, 0, ...nb);
+  }
+
+  // Mitglieder: aus anderen Bonds/Bridges lösen, selbst "inet manual" ohne IP
+  if (!remove && members.length) {
+    for (const b of bl) {
+      if (b.type !== 'iface' || b.name === m.name || b.family === 'inet6') continue;
+      for (const o of b.options) {
+        if (['bond-slaves', 'bond_slaves', 'slaves', 'bridge-ports', 'bridge_ports'].includes(o.key)) {
+          const v = o.value.split(/\s+/).filter((x) => x !== 'none' && !members.includes(x));
+          if (v.join(' ') !== o.value) { o.value = v.length ? v.join(' ') : 'none'; changed.add(b.file); }
+        }
+      }
+    }
+    for (const x of members) {
+      const idx = bl.findIndex((b) => b.type === 'iface' && b.name === x && b.family !== 'inet6');
+      const cur = bl[idx];
+      // Bereits "manual" ohne IP (z. B. Bond als Bridge-Port): unverändert lassen
+      if (cur && cur.method === 'manual' && !cur.options.some((o) => IPKEYS.has(o.key))) continue;
+      const others = (cur?.options || []).filter((o) => o.comment || !IPKEYS.has(o.key));
+      bl = bl.filter((b) => !(b.type === 'iface' && b.name === x));
+      const f = cur?.file || file;
+      changed.add(f);
+      const lines = [`iface ${x} inet manual`, ...others.map((o) => o.comment ?? `    ${o.key} ${o.value}`)];
+      if (cur) { bl.splice(Math.min(idx, bl.length), 0, { type: 'text', lines, file: f }); continue; }
+      // Neues Mitglied vor dem Block der Schnittstelle (inkl. deren auto-Zeile) einfügen
+      let at = bl.findIndex((b) => b.type === 'text' && b.lines[0].startsWith(`iface ${m.name} `));
+      if (at > 0 && bl[at - 1].type === 'auto' && bl[at - 1].names.includes(m.name)) at--;
+      bl.splice(at < 0 ? bl.length : at, 0, { type: 'auto', kw: 'auto', names: [x], file: f }, { type: 'text', lines, file: f }, { type: 'raw', line: '', file: f });
+    }
+  }
+
+  const files = {};
+  for (const f of changed) {
+    const lines = [];
+    for (const b of bl.filter((x) => x.file === f)) {
+      if (b.type === 'raw') lines.push(b.line);
+      else if (b.type === 'auto') lines.push(`${b.kw} ${b.names.join(' ')}`);
+      else if (b.type === 'text') lines.push(...b.lines);
+      else if (b.type === 'iface') {
+        lines.push(`iface ${b.name} ${b.family} ${b.method}`);
+        b.options.forEach((o) => lines.push(o.comment ?? `    ${o.key} ${o.value}`));
+      }
+    }
+    files[f] = lines.join('\n').replace(/\n{3,}/g, '\n\n').replace(/^\n+/, '').replace(/\n*$/, '\n');
+  }
+  return { files };
+}
+
+module.exports = { validate, blank, fromNetplan, applyNetplan, parseInterfaces, fromIfupdown, applyIfupdown, BOND_MODES, HASH };

src/main/network.js

@@ -0,0 +1,323 @@
+// Netzwerk-Tab: Schnittstellen, IPs, Bonds (LACP), Bridges, VLANs, Gateway, DNS und Hostname entfernter Hosts.
+// Bearbeiten für Ubuntu (netplan) und Debian/Proxmox (ifupdown/ifupdown2); sonst Übersicht + Datei-Editor.
+// Änderungen werden mit automatischem Rollback angewendet: Der Server stellt die vorherige Konfiguration
+// nach 90 s selbst wieder her, falls MrTerm sich nicht erneut verbinden und die Änderung bestätigen kann.
+const i18n = require('../i18n');
+const { execOn } = require('./docker');
+const nc = require('./netconf');
+
+const STATE = '/var/lib/mrterm-net';
+const ROLLBACK_SECONDS = 90;
+const lastLine = (s) => String(s || '').split('\n').map((l) => l.trim()).filter(Boolean).slice(-1)[0] || '';
+const b64 = (s) => Buffer.from(String(s)).toString('base64');
+const HOSTNAME = /^[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;
+const EDITABLE_PATH = /^(\/etc\/netplan\/[\w.-]+\.yaml|\/etc\/network\/interfaces(\.d\/[\w.-]+)?|\/etc\/systemd\/network\/[\w.-]+|\/etc\/resolv\.conf|\/etc\/hosts)$/;
+
+const BACKENDS = {
+  netplan: {
+    paths: ['etc/netplan'],
+    restore: `rm -rf /etc/netplan && mkdir -p /etc/netplan && tar xzf ${STATE}/backup.tgz -C /`,
+    validate: 'netplan generate',
+    apply: 'netplan apply',
+  },
+  ifupdown: {
+    paths: ['etc/network/interfaces', 'etc/network/interfaces.d'],
+    restore: `tar xzf ${STATE}/backup.tgz -C /`,
+    validate: 'if command -v ifreload >/dev/null 2>&1; then ifquery -a >/dev/null; else ifup --no-act -a >/dev/null; fi',
+    apply: 'if command -v ifreload >/dev/null 2>&1; then ifreload -a; else systemctl restart networking; fi',
+  },
+  networkd: {
+    paths: ['etc/systemd/network'],
+    restore: `rm -rf /etc/systemd/network && mkdir -p /etc/systemd/network && tar xzf ${STATE}/backup.tgz -C /`,
+    validate: 'true',
+    apply: 'networkctl reload 2>/dev/null || systemctl restart systemd-networkd',
+  },
+};
+
+// Merged netplan-Konfiguration (alle /etc/netplan/*.yaml) als JSON – netplan bringt python3-yaml mit
+const NETPLAN_PY = `import sys,json,glob,os
+try:
+    import yaml
+except Exception:
+    print(json.dumps({"error":"python3-yaml missing"})); sys.exit(0)
+def merge(a,b):
+    for k,v in (b or {}).items():
+        if isinstance(v,dict) and isinstance(a.get(k),dict): merge(a[k],v)
+        else: a[k]=v
+    return a
+files=sorted(glob.glob("/etc/netplan/*.yaml"), key=os.path.basename)
+out={}
+for f in files:
+    merge(out, yaml.safe_load(open(f)) or {})
+print(json.dumps({"files":files,"config":out}))`;
+
+const GATHER = `export PATH=$PATH:/usr/sbin:/sbin
+echo "@@HOSTNAME"; hostname
+echo "@@OS"; (. /etc/os-release 2>/dev/null; echo "$PRETTY_NAME")
+echo "@@BACKEND"
+if ls /etc/netplan/*.yaml >/dev/null 2>&1 && command -v netplan >/dev/null 2>&1; then echo netplan
+elif [ -f /etc/network/interfaces ] && { command -v ifreload >/dev/null 2>&1 || command -v ifup >/dev/null 2>&1; }; then echo ifupdown
+elif systemctl is-active -q NetworkManager 2>/dev/null; then echo networkmanager
+elif systemctl is-active -q systemd-networkd 2>/dev/null; then echo networkd
+else echo unknown; fi
+echo "@@LINK"; ip -j -d link show
+echo "@@ADDR"; ip -j addr show
+echo "@@ROUTE"; ip -j route show default
+echo "@@ROUTE6"; ip -j -6 route show default
+echo "@@RESOLVTYPE"; if [ -L /etc/resolv.conf ]; then echo symlink; else echo file; fi
+echo "@@RESOLV"; cat /etc/resolv.conf 2>/dev/null
+echo "@@RESOLVECTL"; resolvectl dns 2>/dev/null
+echo "@@BONDING"; for f in /proc/net/bonding/*; do [ -f "$f" ] && { echo "== \${f##*/}"; cat "$f"; }; done
+echo "@@NETPLAN"; if command -v netplan >/dev/null 2>&1; then python3 -c '${NETPLAN_PY}' 2>&1; fi
+echo "@@IFUPDOWN"; for f in /etc/network/interfaces /etc/network/interfaces.d/*; do [ -f "$f" ] && { echo "==FILE $f"; cat "$f"; echo; }; done
+echo "@@FILES"; ls -1d /etc/netplan/*.yaml /etc/network/interfaces /etc/network/interfaces.d/* /etc/systemd/network/* 2>/dev/null
+echo "@@PENDING"; [ -f ${STATE}/pending ] && echo pending; [ -f ${STATE}/rolled-back ] && cat ${STATE}/rolled-back
+echo "@@END"`;
+
+function sections(out) {
+  const res = {};
+  let cur = null;
+  for (const line of out.split('\n')) {
+    const m = line.match(/^@@(\w+)$/);
+    if (m) { cur = m[1]; res[cur] = []; continue; }
+    if (cur) res[cur].push(line);
+  }
+  return Object.fromEntries(Object.entries(res).map(([k, v]) => [k, v.join('\n').trim()]));
+}
+const json = (s, def) => { try { return JSON.parse(s); } catch { return def; } };
+
+function parseBonding(text) {
+  const out = {};
+  for (const part of text.split(/^== /m).filter(Boolean)) {
+    const [name, ...lines] = part.split('\n');
+    const b = { slaves: [] };
+    let slave = null;
+    for (const l of lines) {
+      const [k, ...v] = l.split(':');
+      const val = v.join(':').trim();
+      if (k === 'Bonding Mode') b.mode = val;
+      else if (k === 'Transmit Hash Policy') b.hashPolicy = val.replace(/\s*\(\d+\)$/, '');
+      else if (k === 'LACP rate') b.lacpRate = val;
+      else if (k === 'MII Polling Interval (ms)') b.miimon = val;
+      else if (k === 'Slave Interface') { slave = { name: val }; b.slaves.push(slave); }
+      else if (slave && k === 'MII Status') slave.mii = val;
+      else if (slave && k === 'Speed') slave.speed = val;
+      else if (slave && k === 'Aggregator ID') slave.aggregator = val;
+      else if (!slave && k === 'MII Status') b.mii = val;
+      else if (k.trim() === 'Partner Mac Address' && !b.partnerMac) b.partnerMac = val;
+    }
+    out[name.trim()] = b;
+  }
+  return out;
+}
+
+class NetworkConfigManager {
+  constructor(ssh) {
+    this.ssh = ssh;
+    this.sessions = new Map(); // id -> { conn, jumps, host, sudo, backend, blocks, netplan }
+  }
+
+  get(id) {
+    const s = this.sessions.get(id);
+    if (!s) throw new Error(i18n.t('Network session not found'));
+    return s;
+  }
+
+  // Shell-Skript als root ausführen (Skript base64-kodiert, damit kein Quoting-Problem entsteht)
+  root(s, script, conn = s.conn) {
+    const cmd = `sh -c "$(printf %s ${b64(script)} | base64 -d)"`;
+    if (!s.sudo) return execOn(conn, cmd);
+    return execOn(conn, `sudo -S -p '' ${cmd}`, `${s.host.password || ''}\n`);
+  }
+  async rootOk(s, script) {
+    const r = await this.root(s, script);
+    if (r.code) throw new Error(lastLine(r.err) || lastLine(r.out) || i18n.t('Command failed with code {code}', { code: r.code }));
+    return r.out;
+  }
+
+  async open(id, host, onClose) {
+    const { conn, jumps } = await this.ssh.connect(host, id);
+    const s = { conn, jumps, host, sudo: false, onClose };
+    this.sessions.set(id, s);
+    this.watch(id, s);
+    if ((await execOn(conn, 'id -u')).out.trim() !== '0') {
+      s.sudo = true;
+      const r = await execOn(conn, "sudo -S -p '' -v", `${host.password || ''}\n`);
+      if (r.code) throw new Error(i18n.t('Root privileges are required. Log in as root or save the password of a user with sudo rights on the host.'));
+    }
+    return this.read(id);
+  }
+
+  watch(id, s) {
+    s.conn.on('close', () => { if (this.sessions.get(id) === s && !s.replacing) { this.close(id); s.onClose(); } });
+    s.conn.on('error', () => {});
+  }
+
+  async read(id) {
+    const s = this.get(id);
+    const sec = sections(await this.rootOk(s, GATHER));
+    s.backend = sec.BACKEND || 'unknown';
+    const links = json(sec.LINK, []);
+    const addrs = json(sec.ADDR, []);
+    const bonding = parseBonding(sec.BONDING || '');
+    let config = [];
+    let note = '';
+    if (s.backend === 'netplan') {
+      const np = json(sec.NETPLAN, {});
+      if (np.error || !np.config) { note = i18n.t('netplan configuration could not be read ({err}).', { err: np.error || lastLine(sec.NETPLAN) }); s.netplan = null; }
+      else { s.netplan = np; config = nc.fromNetplan(np.config); }
+    } else if (s.backend === 'ifupdown') {
+      s.blocks = [];
+      for (const part of (sec.IFUPDOWN || '').split(/^==FILE /m).filter(Boolean)) {
+        const nl = part.indexOf('\n');
+        s.blocks.push(...nc.parseInterfaces(part.slice(nl + 1), part.slice(0, nl).trim()));
+      }
+      config = nc.fromIfupdown(s.blocks);
+    }
+    const interfaces = links.filter((l) => l.ifname !== 'lo').map((l) => {
+      const a = addrs.find((x) => x.ifname === l.ifname) || {};
+      return {
+        name: l.ifname, mac: l.address, mtu: l.mtu, state: l.operstate, master: l.master || '',
+        kind: l.linkinfo?.info_kind || (l.link_type === 'ether' ? 'ethernet' : l.link_type), slaveKind: l.linkinfo?.info_slave_kind || '',
+        vlanId: l.linkinfo?.info_data?.id, link: l.link || '',
+        addrs: (a.addr_info || []).filter((x) => x.scope !== 'link').map((x) => ({ addr: `${x.local}/${x.prefixlen}`, family: x.family, dynamic: !!x.dynamic })),
+        bonding: bonding[l.ifname] || null,
+      };
+    });
+    const resolv = sec.RESOLV || '';
+    return {
+      hostname: sec.HOSTNAME, os: sec.OS, backend: s.backend, editable: ['netplan', 'ifupdown'].includes(s.backend) && !note, note,
+      interfaces, config,
+      routes: [...json(sec.ROUTE, []), ...json(sec.ROUTE6, [])].map((r) => ({ via: r.gateway, dev: r.dev, metric: r.metric })),
+      dns: { servers: (resolv.match(/^nameserver\s+(\S+)/gm) || []).map((l) => l.split(/\s+/)[1]), search: ((resolv.match(/^search\s+(.+)$/m) || [])[1] || '').split(/\s+/).filter(Boolean), resolved: sec.RESOLVECTL || '', editable: sec.RESOLVTYPE === 'file' },
+      files: (sec.FILES || '').split('\n').filter(Boolean),
+      rolledBack: /\d/.test(sec.PENDING || '') ? sec.PENDING.split('\n').filter((x) => /\d/.test(x)).pop() : '',
+    };
+  }
+
+  // Schreibbefehle für eine Modelländerung erzeugen
+  plan(s, model, remove) {
+    const m = nc.validate(model, i18n.t);
+    if (s.backend === 'netplan') {
+      const cfg = nc.applyNetplan(s.netplan.config, m, { remove });
+      // Gesamte Konfiguration in eine Datei; bisherige Dateien werden deaktiviert (im Backup enthalten)
+      const others = s.netplan.files.filter((f) => f !== '/etc/netplan/90-mrterm.yaml');
+      return [
+        ...others.map((f) => `mv '${f}' '${f}.mrterm-off'`),
+        `printf %s ${b64(`# Managed by MrTerm – previous files were renamed to *.yaml.mrterm-off\n${JSON.stringify(cfg, null, 2)}\n`)} | base64 -d > /etc/netplan/90-mrterm.yaml`,
+        'chmod 600 /etc/netplan/90-mrterm.yaml',
+        // cloud-init soll die Netzwerkkonfiguration beim nächsten Start nicht neu erzeugen
+        ...(others.some((f) => /cloud-init/.test(f)) ? ["[ -d /etc/cloud/cloud.cfg.d ] && echo 'network: {config: disabled}' > /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg || true"] : []),
+      ];
+    }
+    if (s.backend === 'ifupdown') {
+      const { files } = nc.applyIfupdown(s.blocks, m, { remove });
+      return Object.entries(files).map(([f, content]) => {
+        if (!/^\/etc\/network\/interfaces(\.d\/[\w.-]+)?$/.test(f)) throw new Error('Invalid file');
+        return `printf %s ${b64(content)} | base64 -d > '${f}'`;
+      });
+    }
+    throw new Error(i18n.t('Editing is not supported for this network configuration ({backend}).', { backend: s.backend }));
+  }
+
+  // Änderung anwenden: Backup, schreiben, prüfen, im Hintergrund anwenden, Rollback-Wächter starten, neu verbinden und bestätigen
+  async apply(id, writes, verifyAddress, backendName) {
+    const s = this.get(id);
+    const be = BACKENDS[backendName || s.backend];
+    if (!be) throw new Error(i18n.t('Editing is not supported for this network configuration ({backend}).', { backend: s.backend }));
+    const script = `export PATH=$PATH:/usr/sbin:/sbin
+mkdir -p ${STATE} || exit 1; rm -f ${STATE}/pending ${STATE}/rolled-back
+cd / && tar czf ${STATE}/backup.tgz $(for p in ${be.paths.join(' ')}; do [ -e "$p" ] && echo "$p"; done) || exit 1
+# Schreiben in einer Subshell: bei einem Fehler sofort den alten Stand wiederherstellen
+if ! ( set -e
+${writes.join('\n')}
+) >${STATE}/write.log 2>&1; then ${be.restore}; cat ${STATE}/write.log >&2; exit 5; fi
+if ! (${be.validate}) >${STATE}/validate.log 2>&1; then ${be.restore}; cat ${STATE}/validate.log >&2; exit 4; fi
+touch ${STATE}/pending
+nohup setsid sh -c 'export PATH=$PATH:/usr/sbin:/sbin; sleep 2; (${be.apply}) >${STATE}/apply.log 2>&1; sleep ${ROLLBACK_SECONDS}; if [ -f ${STATE}/pending ]; then ${be.restore}; (${be.apply}) >>${STATE}/apply.log 2>&1; rm -f ${STATE}/pending; date "+%Y-%m-%d %H:%M:%S" > ${STATE}/rolled-back; fi' >/dev/null 2>&1 &
+echo started`;
+    const r = await this.root(s, script);
+    if (r.code === 4) throw new Error(i18n.t('The new configuration is invalid and was not applied: {err}', { err: lastLine(r.err) }));
+    if (r.code) throw new Error(lastLine(r.err) || i18n.t('Command failed with code {code}', { code: r.code }));
+    const deadline = Date.now() + (ROLLBACK_SECONDS - 12) * 1000;
+    await new Promise((res) => setTimeout(res, 6000));
+    const target = { ...s.host, address: verifyAddress || s.host.address };
+    while (Date.now() < deadline) {
+      try {
+        const { conn, jumps } = await this.ssh.connect(target, id);
+        const c = await this.root(s, `rm -f ${STATE}/pending`, conn);
+        if (c.code) { conn.end(); throw new Error(lastLine(c.err)); }
+        // Neue Verbindung übernimmt die Sitzung
+        s.replacing = true;
+        try { s.conn.end(); } catch {}
+        s.jumps?.forEach((x) => { try { x.end(); } catch {} });
+        Object.assign(s, { conn, jumps, replacing: false });
+        if (verifyAddress) s.host = target;
+        this.watch(id, s);
+        return { confirmed: true };
+      } catch {
+        await new Promise((res) => setTimeout(res, 4000));
+      }
+    }
+    return { confirmed: false, rollbackSeconds: ROLLBACK_SECONDS };
+  }
+
+  saveInterface(id, model, verifyAddress) {
+    const s = this.get(id);
+    return this.apply(id, this.plan(s, model, false), verifyAddress);
+  }
+
+  removeInterface(id, model) {
+    const s = this.get(id);
+    return this.apply(id, this.plan(s, model, true));
+  }
+
+  async setHostname(id, name) {
+    const s = this.get(id);
+    if (!HOSTNAME.test(name)) throw new Error(i18n.t('Invalid value for {field}: {value}', { field: 'hostname', value: name }));
+    const old = (await this.rootOk(s, 'hostname')).trim();
+    const esc = (x) => x.replace(/\./g, '\\.');
+    const short = name.split('.')[0];
+    await this.rootOk(s, `export PATH=$PATH:/usr/sbin:/sbin
+hostnamectl set-hostname '${name}' 2>/dev/null || { echo '${name}' > /etc/hostname; hostname '${name}'; }
+${HOSTNAME.test(old) ? `sed -i -E 's/(^|[[:space:]])${esc(old)}([[:space:]]|$)/\\1${name}\\2/g; s/(^|[[:space:]])${esc(old.split('.')[0])}([[:space:]]|$)/\\1${short}\\2/g' /etc/hosts` : ''}
+grep -qE '[[:space:]]${esc(short)}([[:space:]]|$)' /etc/hosts || echo '127.0.1.1 ${name}${name !== short ? ` ${short}` : ''}' >> /etc/hosts`);
+    return true;
+  }
+
+  async setResolv(id, servers, search) {
+    const s = this.get(id);
+    const ip = /^(\d{1,3}(\.\d{1,3}){3}|[0-9a-fA-F:]+)$/;
+    servers.forEach((x) => { if (!ip.test(x)) throw new Error(i18n.t('Invalid value for {field}: {value}', { field: 'DNS', value: x })); });
+    search.forEach((x) => { if (!/^[a-zA-Z0-9.-]+$/.test(x)) throw new Error(i18n.t('Invalid value for {field}: {value}', { field: 'search', value: x })); });
+    const content = `# Written by MrTerm\n${search.length ? `search ${search.join(' ')}\n` : ''}${servers.map((x) => `nameserver ${x}`).join('\n')}\n`;
+    await this.rootOk(s, `[ -L /etc/resolv.conf ] && exit 5; printf %s ${b64(content)} | base64 -d > /etc/resolv.conf`);
+    return true;
+  }
+
+  async readFile(id, path) {
+    const s = this.get(id);
+    if (!EDITABLE_PATH.test(path)) throw new Error('Invalid file');
+    return this.rootOk(s, `cat '${path}'`);
+  }
+
+  // Datei direkt bearbeiten; Netzwerkdateien mit Rollback, /etc/hosts und resolv.conf direkt
+  async writeFile(id, path, content, verifyAddress) {
+    const s = this.get(id);
+    if (!EDITABLE_PATH.test(path)) throw new Error('Invalid file');
+    const write = `printf %s ${b64(content)} | base64 -d > '${path}'`;
+    if (/^\/etc\/(hosts|resolv\.conf)$/.test(path)) { await this.rootOk(s, write); return { confirmed: true, direct: true }; }
+    const backend = path.startsWith('/etc/netplan/') ? 'netplan' : path.startsWith('/etc/network/') ? 'ifupdown' : 'networkd';
+    return this.apply(id, [write], verifyAddress, backend);
+  }
+
+  close(id) {
+    const s = this.sessions.get(id);
+    if (!s) return;
+    this.sessions.delete(id);
+    try { s.conn.end(); } catch {}
+    s.jumps?.forEach((c) => { try { c.end(); } catch {} });
+  }
+}
+
+module.exports = { NetworkConfigManager, parseBonding, sections };

src/main/ssh.js

@@ -9,7 +9,11 @@ const i18n = require('../i18n');
 
 function defaultAgent() {
   if (process.env.SSH_AUTH_SOCK) return process.env.SSH_AUTH_SOCK;
-  if (process.platform === 'win32') return '\\\\.\\pipe\\openssh-ssh-agent';
+  if (process.platform === 'win32') {
+    // Nur verwenden, wenn der Windows-OpenSSH-Agent läuft (sonst schlägt die Agent-Anmeldung unnötig fehl)
+    const pipe = '\\\\.\\pipe\\openssh-ssh-agent';
+    try { return fs.existsSync(pipe) ? pipe : undefined; } catch { return undefined; }
+  }
   return undefined;
 }
 
@@ -111,8 +115,16 @@ class SshManager {
         }
         finish(answers);
       });
-      conn.once('ready', () => resolve(conn));
+      // ssh2 kann mehrere 'error'-Ereignisse senden (z. B. Anmeldefehler und danach Handshake-Timeout).
-      conn.once('error', async (err) => {
+      // Ein dauerhafter Listener verhindert, dass ein späterer Fehler den Hauptprozess abstürzen lässt;
+      // Fehler nach dem Verbindungsaufbau melden die Sitzungen selbst (close/error).
+      let settled = false;
+      conn.on('error', () => {});
+      conn.once('ready', () => { settled = true; resolve(conn); });
+      conn.on('error', async (err) => {
+        if (settled) return;
+        settled = true;
+        try { conn.end(); } catch {}
         // Kein Passwort hinterlegt und alle Methoden schlugen fehl -> nach Passwort fragen und neu versuchen
         if (err.level === 'client-authentication' && !host.password && !host._retried) {
           const pw = await this.askSecret(sessionId, { title: i18n.t('Password'), prompt: i18n.t('Password for {user}', { user: `${cfg.username}@${host.address}` }), echo: false, host: host.label || host.address });
@@ -121,9 +133,9 @@ class SshManager {
             return;
           }
         }
-        reject(err);
+        reject(err.level === 'client-authentication' ? new Error(i18n.t('Authentication failed for {user}. Check the username, password or key.', { user: `${cfg.username}@${host.address}` })) : err);
       });
-      try { conn.connect(cfg); } catch (e) { reject(e); }
+      try { conn.connect(cfg); } catch (e) { settled = true; reject(e); }
     });
   }
 
@@ -137,15 +149,19 @@ class SshManager {
 
     const env = host.env ? Object.fromEntries(host.env.split('\n').filter(Boolean).map((l) => l.split('=').map((s) => s.trim()))) : undefined;
     await new Promise((res, rej) => {
-      conn.shell({ term: 'xterm-256color', cols, rows }, { env }, (err, stream) => {
+      const pty = { term: 'xterm-256color', cols, rows };
+      const onStream = (err, stream) => {
         if (err) return rej(err);
         sess.stream = stream;
         stream.on('data', (d) => send('data', d.toString('utf8')));
         stream.stderr.on('data', (d) => send('data', d.toString('utf8')));
         stream.on('close', () => conn.end());
-        if (host.startupCommand) stream.write(host.startupCommand + '\n');
+        if (host.startupCommand && !host.execCommand) stream.write(host.startupCommand + '\n');
         res();
-      });
+      };
+      // execCommand: statt Login-Shell einen Befehl mit PTY starten (z. B. docker exec -it …)
+      if (host.execCommand) conn.exec(host.execCommand, { pty, env }, onStream);
+      else conn.shell(pty, { env }, onStream);
     });
   }
 

src/main/store.js

@@ -12,6 +12,7 @@ const DEFAULTS = {
   keys: [],
   snippets: [],
   forwards: [],
+  vpns: [],
   knownHosts: {},
   history: [],
   settings: {
@@ -31,16 +32,63 @@ const DEFAULTS = {
     updateToken: '',
     updateAutoCheck: true,
     updatePrerelease: false,
+    autoLock: 0,
     language: 'auto',
   },
 };
 
+const merge = (parsed) => ({ ...structuredClone(DEFAULTS), ...parsed, settings: { ...DEFAULTS.settings, ...(parsed.settings || {}) } });
+
+// AES-256-GCM; Ergebnis als base64-Felder für JSON
+function box(key, plain) {
+  const iv = crypto.randomBytes(12);
+  const c = crypto.createCipheriv('aes-256-gcm', key, iv);
+  const ct = Buffer.concat([c.update(plain), c.final()]);
+  return { iv: iv.toString('base64'), tag: c.getAuthTag().toString('base64'), ct: ct.toString('base64') };
+}
+function unbox(key, b) {
+  const d = crypto.createDecipheriv('aes-256-gcm', key, Buffer.from(b.iv, 'base64'));
+  d.setAuthTag(Buffer.from(b.tag, 'base64'));
+  return Buffer.concat([d.update(Buffer.from(b.ct, 'base64')), d.final()]);
+}
+
 class Store {
   constructor() {
     this.dir = app.getPath('userData');
     this.file = path.join(this.dir, 'vault.dat');
     this.data = structuredClone(DEFAULTS);
     this.encrypted = false;
+    // App-Sperre: Inhalt zusätzlich mit zufälligem Datenschlüssel (DEK, AES-256-GCM) verschlüsselt.
+    // Der DEK liegt je Entsperrmethode verpackt vor: Passwort (scrypt) und/oder FIDO2-Schlüssel (PRF/hmac-secret).
+    this.lock = null;   // { password: { salt, N, wrap } | null, fido: [{ id, label, credId, prfSalt, wrap }] }
+    this.dek = null;
+    this.sealed = null; // verschlüsselter Inhalt, solange nach dem Start noch nicht entsperrt
+    this.locked = false;
+  }
+
+  get lockEnabled() { return !!(this.lock && (this.lock.password || this.lock.fido.length)); }
+
+  // Entsperren mit einem Schlüssel, der den DEK verpackt hat (wirft bei falschem Schlüssel)
+  unlockWith(kek, wrap) {
+    const dek = unbox(kek, wrap);
+    if (this.sealed) {
+      const parsed = JSON.parse(unbox(dek, this.sealed).toString('utf8'));
+      this.data = merge(parsed);
+      this.sealed = null;
+    }
+    this.dek = dek;
+    this.locked = false;
+  }
+
+  // Neue Entsperrmethode: verpackt den (ggf. neu erzeugten) DEK mit kek
+  wrapDek(kek) {
+    if (!this.dek) this.dek = crypto.randomBytes(32);
+    return box(kek, this.dek);
+  }
+
+  // Letzte Methode entfernt → Sperre aus, Inhalt wieder nur per Betriebssystem verschlüsselt
+  dropLockIfEmpty() {
+    if (!this.lockEnabled) { this.lock = null; this.dek = null; }
   }
 
   canEncrypt() {
@@ -64,12 +112,23 @@ class Store {
       json = raw.toString('utf8');
     }
     const parsed = JSON.parse(json);
-    this.data = { ...structuredClone(DEFAULTS), ...parsed, settings: { ...DEFAULTS.settings, ...(parsed.settings || {}) } };
+    if (parsed.mrtermLock) {
+      // Gesperrt: nur Darstellungs-Einstellungen (meta) sind bis zum Entsperren bekannt
+      this.lock = parsed.lock;
+      this.sealed = parsed.data;
+      this.locked = true;
+      this.data = merge({ settings: parsed.meta || {} });
+    } else this.data = merge(parsed);
     return this.data;
   }
 
   save() {
-    const json = JSON.stringify(this.data, null, 2);
+    if (this.sealed) return; // Inhalt noch nicht entschlüsselt – nichts überschreiben
+    let json = JSON.stringify(this.data, null, 2);
+    if (this.lockEnabled && this.dek) {
+      const { language, appTheme, accent } = this.data.settings;
+      json = JSON.stringify({ mrtermLock: 1, meta: { language, appTheme, accent }, lock: this.lock, data: box(this.dek, Buffer.from(json)) });
+    }
     const tmp = this.file + '.tmp';
     if (this.canEncrypt()) {
       fs.writeFileSync(tmp, Buffer.concat([Buffer.from('ENC1'), safeStorage.encryptString(json)]));

src/main/updater.js

@@ -7,7 +7,53 @@ const os = require('os');
 const path = require('path');
 const i18n = require('../i18n');
 
-const DEFAULT_REPO = 'https://git.mrblake.cc/MrBlake/MrTerm';
+// Startet ein Programm und liefert den Exit-Code ('ENOENT', falls es nicht existiert).
+// Electron/Chromium setzt unter Linux PR_SET_NO_NEW_PRIVS, das alle Kindprozesse erben – dann
+// funktionieren weder pkexec noch sudo. Deshalb über systemd-run --user starten: Elternprozess ist
+// dann der systemd-User-Manager, ohne diesen Schalter.
+const GUI_ENV = ['DISPLAY', 'WAYLAND_DISPLAY', 'XAUTHORITY', 'XDG_RUNTIME_DIR', 'XDG_SESSION_TYPE', 'DBUS_SESSION_BUS_ADDRESS'];
+function spawnCode(cmd, args) {
+  return new Promise((resolve) => {
+    const p = spawn(cmd, args, { stdio: 'ignore' });
+    p.on('error', (e) => resolve(e.code === 'ENOENT' ? 'ENOENT' : e.message));
+    p.on('exit', (c) => resolve(c));
+  });
+}
+let hasSystemdRun;
+async function run(cmd, args) {
+  if (hasSystemdRun === undefined) hasSystemdRun = (await spawnCode('systemd-run', ['--user', '--quiet', '--wait', '--collect', 'true'])) === 0;
+  if (!hasSystemdRun) return spawnCode(cmd, args);
+  const inPath = cmd.includes('/') ? fs.existsSync(cmd) : (process.env.PATH || '').split(':').some((d) => d && fs.existsSync(path.join(d, cmd)));
+  if (!inPath) return 'ENOENT';
+  const env = GUI_ENV.filter((k) => process.env[k]).flatMap((k) => ['-E', `${k}=${process.env[k]}`]);
+  return spawnCode('systemd-run', ['--user', '--quiet', '--wait', '--collect', ...env, '--', cmd, ...args]);
+}
+
+// Fallback ohne Polkit-Agent: pacman -U per sudo in einem Terminalfenster; wartet, bis das Fenster geschlossen ist.
+// Der Erfolg wird über eine Marker-Datei erkannt, da nicht jedes Terminal den Exit-Code durchreicht.
+async function installInTerminal(file) {
+  const q = (s) => `'${String(s).replace(/'/g, `'\\''`)}'`;
+  const marker = file + '.ok';
+  try { fs.unlinkSync(marker); } catch {}
+  const script = `sudo /usr/bin/pacman -U --noconfirm ${q(file)} && touch ${q(marker)} || { echo; read -rp "[Enter]"; }`;
+  const terms = [
+    ['konsole', ['--nofork', '-e', 'bash', '-c', script]],
+    ['gnome-terminal', ['--wait', '--', 'bash', '-c', script]],
+    ['kitty', ['bash', '-c', script]],
+    ['alacritty', ['-e', 'bash', '-c', script]],
+    ['foot', ['bash', '-c', script]],
+    ['xfce4-terminal', ['--disable-server', '-x', 'bash', '-c', script]],
+    ['xterm', ['-e', 'bash', '-c', script]],
+  ];
+  for (const [cmd, args] of terms) {
+    const c = await run(cmd, args);
+    if (c === 'ENOENT') continue;
+    return fs.existsSync(marker) ? 0 : c || 1;
+  }
+  return 'ENOENT';
+}
+
+const DEFAULT_REPO ='https://git.mrblake.cc/MrBlake/MrTerm';
 
 function parseRepo(url) {
   const u = new URL((url || DEFAULT_REPO).replace(/\.git$/, '').replace(/\/+$/, ''));
@@ -134,11 +180,12 @@ class Updater {
       app.relaunch({ execPath: target });
       app.exit(0);
     } else if (kind === 'pacman' && /\.(pacman|pkg\.tar\.zst)$/.test(file)) {
-      await new Promise((resolve, reject) => {
+      // 1. pkexec (grafische Passwortabfrage über den Polkit-Agent)
-        const p = spawn('pkexec', ['pacman', '-U', '--noconfirm', file], { stdio: 'ignore' });
+      let code = await run('pkexec', ['/usr/bin/pacman', '-U', '--noconfirm', file]);
-        p.on('error', reject);
+      // 126/127 = Abfrage abgebrochen bzw. kein Polkit-Agent → Terminal mit sudo öffnen
-        p.on('exit', (c) => (c === 0 ? resolve() : reject(new Error(i18n.t('pacman exited with code {code}', { code: c })))));
+      if (code === 126 || code === 127 || code === 'ENOENT') code = await installInTerminal(file);
-      });
+      if (code === 'ENOENT') throw new Error(i18n.t('Automatic installation is not possible here. The file is located at: {file}', { file }));
+      if (code !== 0) throw new Error(i18n.t('pacman exited with code {code}', { code }));
       app.relaunch();
       app.exit(0);
     } else {

src/main/vpn.js

@@ -0,0 +1,183 @@
+// VPN-Verbindungen (WireGuard / OpenVPN), die vor dem Verbinden zu zugeordneten Hosts automatisch aufgebaut werden.
+//   Linux:   NetworkManager (nmcli) – kein root nötig. MrTerm legt pro VPN eine Verbindung "mrterm-<id>" an
+//            (autoconnect aus). OpenVPN braucht das Plugin networkmanager-openvpn.
+//   Windows: WireGuard als Tunnel-Dienst über wireguard.exe (UAC-Abfrage), OpenVPN über die OpenVPN GUI.
+const { execFile, spawn } = require('child_process');
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const i18n = require('../i18n');
+
+function exec(cmd, args) {
+  return new Promise((resolve) => {
+    execFile(cmd, args, { windowsHide: true, timeout: 90000 }, (err, stdout, stderr) => {
+      resolve({ code: err ? (typeof err.code === 'number' ? err.code : err.code === 'ENOENT' ? 'ENOENT' : 1) : 0, stdout: String(stdout || ''), stderr: String(stderr || err?.message || '') });
+    });
+  });
+}
+const lastLine = (s) => s.split('\n').map((l) => l.trim()).filter(Boolean).slice(-1)[0] || '';
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+
+class VpnManager {
+  constructor(store, userDir) {
+    this.store = store;
+    this.dir = path.join(userDir, 'vpn');
+    this.busy = new Map(); // id -> laufendes up() (parallele Verbindungen zum selben VPN nur einmal aufbauen)
+    this.started = new Set(); // von MrTerm aufgebaute VPNs
+  }
+
+  get(id) { return this.store.get().vpns.find((v) => v.id === id); }
+  nmName(v) { return 'mrterm-' + v.id.slice(0, 8); }
+  // Interface-/Tunnelname: max. 15 Zeichen (Linux), nur [a-z0-9]
+  ifName(v) { return 'mt' + v.id.replace(/-/g, '').slice(0, 10); }
+
+  // ---------------------------------------------------------------- Linux (NetworkManager)
+  async nm(args) {
+    const r = await exec('nmcli', args);
+    if (r.code === 'ENOENT') throw new Error(i18n.t('NetworkManager (nmcli) not found. MrTerm uses NetworkManager for VPN connections.'));
+    return r;
+  }
+  async nmExists(v) {
+    const r = await this.nm(['-t', '-f', 'NAME', 'connection', 'show']);
+    return r.stdout.split('\n').includes(this.nmName(v));
+  }
+  async nmImport(v) {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'mrterm-vpn-'));
+    const file = path.join(tmp, this.ifName(v) + (v.type === 'openvpn' ? '.ovpn' : '.conf'));
+    try {
+      fs.writeFileSync(file, v.config || '', { mode: 0o600 });
+      const r = await this.nm(['connection', 'import', 'type', v.type === 'openvpn' ? 'openvpn' : 'wireguard', 'file', file]);
+      if (r.code) {
+        const err = lastLine(r.stderr);
+        if (v.type === 'openvpn' && /plugin|openvpn/i.test(err)) throw new Error(i18n.t('OpenVPN support for NetworkManager is missing. Install it with: sudo pacman -S networkmanager-openvpn'));
+        throw new Error(i18n.t('VPN configuration could not be imported: {err}', { err }));
+      }
+      const uuid = (r.stdout.match(/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/) || [])[0];
+      const mod = ['connection', 'modify', uuid || this.ifName(v), 'connection.id', this.nmName(v), 'connection.autoconnect', 'no'];
+      if (v.type === 'openvpn' && v.username) mod.push('+vpn.data', `username=${v.username}`);
+      if (v.type === 'openvpn' && v.password) mod.push('+vpn.data', 'password-flags=0', 'vpn.secrets', `password=${v.password}`);
+      const m = await this.nm(mod);
+      if (m.code) throw new Error(lastLine(m.stderr));
+    } finally {
+      fs.rmSync(tmp, { recursive: true, force: true });
+    }
+  }
+
+  // ---------------------------------------------------------------- Windows
+  get wgExe() { return path.join(process.env.ProgramFiles || 'C:\\Program Files', 'WireGuard', 'wireguard.exe'); }
+  get ovpnGui() { return path.join(process.env.ProgramFiles || 'C:\\Program Files', 'OpenVPN', 'bin', 'openvpn-gui.exe'); }
+  // Programm mit Administratorrechten starten (UAC) und warten
+  async elevate(exe, args) {
+    const q = (s) => `'${String(s).replace(/'/g, "''")}'`;
+    const cmd = `$p = Start-Process -FilePath ${q(exe)} -ArgumentList @(${args.map((a) => q(`"${a}"`)).join(',')}) -Verb RunAs -Wait -WindowStyle Hidden -PassThru; exit $p.ExitCode`;
+    const r = await exec('powershell.exe', ['-NoProfile', '-NonInteractive', '-Command', cmd]);
+    if (r.code) throw new Error(i18n.t('VPN “{name}” could not be connected: {err}', { name: path.basename(exe), err: lastLine(r.stderr) || r.code }));
+  }
+  winOvpnName(v) { return this.ifName(v) + '.ovpn'; }
+  async winOpenvpnUp() {
+    const r = await exec('powershell.exe', ['-NoProfile', '-NonInteractive', '-Command',
+      "@(Get-NetAdapter | Where-Object { $_.Status -eq 'Up' -and $_.InterfaceDescription -match 'TAP-Windows|Wintun|OpenVPN|ovpn-dco' }).Count"]);
+    return Number(r.stdout.trim()) > 0;
+  }
+
+  // ---------------------------------------------------------------- Gemeinsame API
+  async isUp(v) {
+    if (process.platform === 'win32') {
+      if (v.type === 'openvpn') return this.winOpenvpnUp();
+      const r = await exec('sc', ['query', `WireGuardTunnel$${this.ifName(v)}`]);
+      return /RUNNING/.test(r.stdout);
+    }
+    const r = await this.nm(['-t', '-f', 'NAME', 'connection', 'show', '--active']);
+    return r.stdout.split('\n').includes(this.nmName(v));
+  }
+
+  async status() {
+    const out = {};
+    for (const v of this.store.get().vpns) { try { out[v.id] = await this.isUp(v); } catch { out[v.id] = false; } }
+    return out;
+  }
+
+  up(id) {
+    if (this.busy.has(id)) return this.busy.get(id);
+    const p = this._up(id).finally(() => this.busy.delete(id));
+    this.busy.set(id, p);
+    return p;
+  }
+
+  async _up(id) {
+    const v = this.get(id);
+    if (!v) throw new Error(i18n.t('VPN not found'));
+    if (await this.isUp(v)) return;
+    const fail = (err) => new Error(i18n.t('VPN “{name}” could not be connected: {err}', { name: v.label, err }));
+    if (process.platform === 'win32') {
+      fs.mkdirSync(this.dir, { recursive: true });
+      if (v.type === 'openvpn') {
+        if (!fs.existsSync(this.ovpnGui)) throw new Error(i18n.t('OpenVPN GUI not found. Install OpenVPN from openvpn.net.'));
+        const dir = path.join(os.homedir(), 'OpenVPN', 'config', this.ifName(v));
+        fs.mkdirSync(dir, { recursive: true });
+        fs.writeFileSync(path.join(dir, this.winOvpnName(v)), v.config || '');
+        spawn(this.ovpnGui, ['--connect', this.winOvpnName(v)], { detached: true, stdio: 'ignore' }).unref();
+      } else {
+        if (!fs.existsSync(this.wgExe)) throw new Error(i18n.t('WireGuard for Windows not found. Install it from wireguard.com.'));
+        const file = path.join(this.dir, this.ifName(v) + '.conf');
+        fs.writeFileSync(file, v.config || '');
+        await this.elevate(this.wgExe, ['/installtunnelservice', file]);
+      }
+      for (let i = 0; i < 60; i++) { if (await this.isUp(v)) { this.started.add(id); return; } await sleep(500); }
+      throw fail(i18n.t('timeout'));
+    }
+    if (!(await this.nmExists(v))) await this.nmImport(v);
+    const r = await this.nm(['--wait', '45', 'connection', 'up', 'id', this.nmName(v)]);
+    if (r.code) throw fail(lastLine(r.stderr));
+    this.started.add(id);
+  }
+
+  // Beim Beenden: von MrTerm aufgebaute VPNs mit Option "beim Beenden trennen" wieder abbauen
+  async downOnQuit() {
+    for (const id of this.started) {
+      const v = this.get(id);
+      if (v && v.disconnectOnQuit !== false) await this.down(id).catch(() => {});
+    }
+  }
+
+  async down(id) {
+    const v = this.get(id);
+    if (!v) return;
+    if (process.platform === 'win32') {
+      if (v.type === 'openvpn') spawn(this.ovpnGui, ['--command', 'disconnect', this.winOvpnName(v)], { detached: true, stdio: 'ignore' }).unref();
+      else if (await this.isUp(v)) await this.elevate(this.wgExe, ['/uninstalltunnelservice', this.ifName(v)]);
+      return;
+    }
+    await this.nm(['connection', 'down', 'id', this.nmName(v)]);
+  }
+
+  // Nach Änderung/Löschen: im System hinterlegte Verbindung entfernen, beim nächsten Verbinden wird neu importiert
+  async forget(v) {
+    if (!v) return;
+    try {
+      if (process.platform === 'win32') {
+        if (v.type !== 'openvpn' && (await this.isUp(v))) await this.elevate(this.wgExe, ['/uninstalltunnelservice', this.ifName(v)]);
+        fs.rmSync(path.join(this.dir, this.ifName(v) + '.conf'), { force: true });
+        fs.rmSync(path.join(os.homedir(), 'OpenVPN', 'config', this.ifName(v)), { recursive: true, force: true });
+      } else if (await this.nmExists(v)) await this.nm(['connection', 'delete', 'id', this.nmName(v)]);
+    } catch { /* VPN-Werkzeuge fehlen – nichts aufzuräumen */ }
+  }
+
+  // Alle VPNs eines Hosts (inkl. Jump-Host-Kette) aufbauen, bevor verbunden wird
+  async ensureForHost(host, onStatus = () => {}) {
+    const ids = [];
+    for (let h = host, n = 0; h && n < 10; h = h.jumpHostId ? this.store.resolveHost(h.jumpHostId) : null, n++) {
+      if (h.vpnId && !ids.includes(h.vpnId)) ids.push(h.vpnId);
+    }
+    for (const id of ids.reverse()) {
+      const v = this.get(id);
+      if (!v) continue;
+      if (await this.isUp(v)) continue;
+      onStatus(i18n.t('Connecting VPN “{name}” …', { name: v.label }));
+      await this.up(id);
+    }
+    return ids.length > 0;
+  }
+}
+
+module.exports = { VpnManager };

src/renderer/app.js

@@ -40,6 +40,10 @@ const ICONS = {
   clock: '<svg viewBox="0 0 24 24"><circle cx="12" cy="12" r="9"/><path d="M12 7v5l3 2"/></svg>',
   download: '<svg viewBox="0 0 24 24"><path d="M12 4v12M6 10l6 6 6-6M4 20h16"/></svg>',
   upload: '<svg viewBox="0 0 24 24"><path d="M12 20V8M6 14l6-6 6 6M4 4h16"/></svg>',
+  docker: '<svg viewBox="0 0 24 24"><path d="M2 12h19c-.6 4.5-4 8-10 8-5 0-8-3-9-8z"/><path d="M5 12V9h3v3M8 12V9h3v3M11 12V9h3v3M8 9V6h3v3M21 12c.5-1.5 0-3-1-3.5"/></svg>',
+  wall: '<svg viewBox="0 0 24 24"><rect x="3" y="4" width="18" height="16" rx="1"/><path d="M3 9.3h18M3 14.7h18M9 4v5.3M15 4v5.3M6 9.3v5.4M12 9.3v5.4M18 9.3v5.4M9 14.7V20M15 14.7V20"/></svg>',
+  network: '<svg viewBox="0 0 24 24"><rect x="9" y="3" width="6" height="5" rx="1"/><rect x="3" y="16" width="6" height="5" rx="1"/><rect x="15" y="16" width="6" height="5" rx="1"/><path d="M12 8v4M6 16v-4h12v4"/></svg>',
+  logs: '<svg viewBox="0 0 24 24"><path d="M5 4h14v16H5zM8 8h8M8 12h8M8 16h5"/></svg>',
 };
 const COLORS = ['#6e7bff', '#3ecf8e', '#ff5f6d', '#ffb454', '#c792ea', '#56d6d6', '#ff79c6', '#8b91a5', '#4f9dff', '#e0a100'];
 function colorFor(h) {
@@ -137,6 +141,9 @@ const S = {
 const settings = () => S.vault.settings;
 
 async function reload() {
+  S.lock = await call('lock:status');
+  $('#lockBtn').style.display = S.lock.enabled ? '' : 'none';
+  if (S.lock.locked) return showLock();
   S.vault = await call('vault:get');
   I18N.setLanguage(settings().language, navigator.language);
   applyStatic();
@@ -145,6 +152,7 @@ async function reload() {
   b.title = S.vault.encrypted ? T('Data is encrypted with the system keyring.') : T('No system keyring available (e.g. install gnome-keyring/kwallet).');
   applyAppTheme();
   S.activeForwards = new Set(await call('fw:active'));
+  if (S.vault.vpns.length) S.vpnStatus = await call('vpn:status').catch(() => ({}));
   render();
 }
 
@@ -269,7 +277,7 @@ function renderTree() {
 
 function render() {
   const page = $('#homeView');
-  const views = { hosts: viewHosts, sftp: viewSftpPicker, keys: viewKeys, forwards: viewForwards, snippets: viewSnippets, known: viewKnown, history: viewHistory, settings: viewSettings };
+  const views = { hosts: viewHosts, sftp: viewSftpPicker, keys: viewKeys, forwards: viewForwards, vpns: viewVpns, snippets: viewSnippets, known: viewKnown, history: viewHistory, settings: viewSettings };
   const scroll = page.scrollTop;
   page.innerHTML = '';
   views[S.view](page);
@@ -383,7 +391,7 @@ function hostMenu(hst) {
   return [
     { label: hst.protocol === 'rdp' ? T('Connect in tab') : T('Connect'), icon: 'play', run: () => connectHost(hst) },
     ...(hst.protocol === 'rdp' ? [{ label: T('Open in separate window'), icon: 'screen', run: () => launchRdp(hst) }] : []),
-    ...(hst.protocol !== 'rdp' ? [{ label: T('Open SFTP'), icon: 'folder', run: () => openSftp(hst) }] : []),
+    ...(hst.protocol !== 'rdp' ? [{ label: T('Open SFTP'), icon: 'folder', run: () => openSftp(hst) }, { label: T('Docker containers'), icon: 'docker', run: () => openDocker(hst) }, { label: T('Firewall'), icon: 'wall', run: () => openFirewall(hst) }, { label: T('Network'), icon: 'network', run: () => openNetwork(hst) }] : []),
     '-',
     { label: T('Edit'), icon: 'edit', run: () => editHost(hst) },
     { label: T('Duplicate'), icon: 'dup', run: async () => { const { id, createdAt, updatedAt, ...rest } = hst; await call('vault:upsert', 'hosts', { ...rest, label: (hst.label || hst.address) + T(' (copy)') }); reload(); } },
@@ -530,6 +538,7 @@ function editHost(hst = {}) {
     row(field(T('Address'), 'address', hst.address, { placeholder: T('IP or hostname') }), portField),
     field(T('Label'), 'label', hst.label, { placeholder: T('My server') }),
     field(T('Group'), 'groupId', hst.groupId, { type: 'select', options: groupOptions() }),
+    ...(S.vault.vpns.length ? [field(T('VPN'), 'vpnId', hst.vpnId, { type: 'select', options: [['', T('— No VPN —')], ...S.vault.vpns.map((v) => [v.id, v.label])], hint: T('Connected automatically before connecting to this host.') })] : []),
     field('Tags', 'tags', (hst.tags || []).join(', '), { placeholder: 'prod, web, db' }),
     heading(T('Authentication')),
     field(T('Username'), 'username', hst.username, { placeholder: 'root' }),
@@ -545,7 +554,7 @@ function editHost(hst = {}) {
       address: v.address.trim(),
       port: v.port ? Number(v.port) : undefined,
       tags: v.tags.split(',').map((t) => t.trim()).filter(Boolean),
-      groupId: v.groupId || null, keyId: v.keyId || null, jumpHostId: v.jumpHostId || null,
+      groupId: v.groupId || null, keyId: v.keyId || null, jumpHostId: v.jumpHostId || null, vpnId: v.vpnId || null,
     };
     await call('vault:upsert', 'hosts', item);
     reload();
@@ -726,6 +735,100 @@ function editForward(f = {}) {
   });
 }
 
+// ============================================================ VPN (WireGuard / OpenVPN)
+S.vpnStatus = {};
+const VPN_TYPES = { wireguard: 'WireGuard', openvpn: 'OpenVPN' };
+
+function viewVpns(page) {
+  page.append(toolbar(T('Search VPNs …'), [
+    { label: T('Import'), icon: 'download', run: () => editVpn({}, true) },
+    { label: T('New VPN'), icon: 'plus', cls: 'primary', run: () => editVpn() },
+  ]));
+  const c = h('<div class="content"></div>'); page.append(c);
+  const list = S.vault.vpns.filter((v) => matches(v.label, VPN_TYPES[v.type]));
+  if (!list.length) return c.append(emptyState('shield', T('No VPNs'), T('Add WireGuard or OpenVPN configurations and assign them to hosts. MrTerm connects the VPN automatically when you open such a host.'), T('New VPN'), () => editVpn()));
+  const l = h('<div class="list"></div>');
+  for (const v of list) {
+    const on = !!S.vpnStatus[v.id];
+    const n = S.vault.hosts.filter((x) => x.vpnId === v.id).length;
+    const card = h(`<div class="card"><div class="avatar" style="background:var(--icon-bg);color:${on ? 'var(--green)' : 'var(--muted)'}">${ICONS.shield}</div><div class="meta"><div class="title">${esc(v.label)} <span class="status-pill ${on ? 'on' : ''}">${on ? T('connected') : T('disconnected')}</span></div><div class="sub">${VPN_TYPES[v.type] || v.type} · ${n} Host${n === 1 ? '' : 's'}</div></div>
+      <button class="btn sm ${on ? '' : 'primary'}" data-a="toggle">${on ? ICONS.stop + T('Disconnect') : ICONS.play + T('Connect')}</button><div class="actions"><button data-a="edit" title="${T('Edit')}">${ICONS.edit}</button><button data-a="del" title="${T('Delete')}">${ICONS.trash}</button></div></div>`);
+    card.onclick = async (e) => {
+      const a = e.target.closest('[data-a]')?.dataset.a;
+      if (a === 'toggle') {
+        const b = e.target.closest('button'); b.disabled = true; b.innerHTML = `<span class="spinner sm"></span>${on ? T('Disconnect') : T('Connecting …')}`;
+        try { await call(on ? 'vpn:down' : 'vpn:up', v.id); if (!on) toast(T('VPN “{name}” connected', { name: v.label }), 'ok'); } catch {}
+        S.vpnStatus = await call('vpn:status').catch(() => ({}));
+        render();
+      } else if (a === 'del') {
+        if (await confirmBox(T('Delete VPN?'), T('“{name}” will be removed. Assigned hosts will connect without VPN.', { name: v.label }))) { await call('vault:remove', 'vpns', v.id); reload(); }
+      } else editVpn(v);
+    };
+    l.append(card);
+  }
+  c.append(l);
+}
+
+function editVpn(v = {}, pick = false) {
+  let type = v.type || 'wireguard';
+  const seg = h('<div class="seg"><button data-t="wireguard">WireGuard</button><button data-t="openvpn">OpenVPN</button></div>');
+  const ovpnBox = h('<div></div>');
+  ovpnBox.append(
+    heading(T('Authentication')),
+    field(T('Username'), 'username', v.username, { placeholder: T('optional') }),
+    field(T('Password'), 'password', v.password, { type: 'password', placeholder: T('stored encrypted') }),
+  );
+  const cfg = field(T('Configuration'), 'config', v.config, { type: 'textarea', placeholder: '[Interface]\nPrivateKey = …', hint: '' });
+  $('textarea', cfg).style.minHeight = '180px';
+  const setType = (t) => {
+    type = t;
+    $$('button', seg).forEach((b) => b.classList.toggle('active', b.dataset.t === t));
+    ovpnBox.style.display = t === 'openvpn' ? '' : 'none';
+    $('textarea', cfg).placeholder = t === 'openvpn' ? 'client\ndev tun\nremote vpn.example.com 1194\n<ca>…</ca>' : '[Interface]\nPrivateKey = …\nAddress = 10.0.0.2/32\n\n[Peer]\n…';
+    const hint = $('.hint', cfg) || cfg.appendChild(h('<div class="hint"></div>'));
+    hint.textContent = t === 'openvpn' ? T('Certificates and keys must be embedded in the .ovpn file (<ca>, <cert>, <key> …).') : T('Contents of a WireGuard .conf file.');
+  };
+  $$('button', seg).forEach((b) => (b.onclick = () => setType(b.dataset.t)));
+
+  // Hosts zuordnen
+  const hostBox = h(`<div class="vpn-hosts"></div>`);
+  const sorted = [...S.vault.hosts].sort((a, b) => (a.label || a.address).localeCompare(b.label || b.address));
+  if (!sorted.length) hostBox.append(h(`<div class="hint">${T('No hosts yet')}</div>`));
+  sorted.forEach((x) => hostBox.append(h(`<label class="check"><input type="checkbox" data-host="${x.id}" ${x.vpnId && x.vpnId === v.id ? 'checked' : ''}/>${esc(x.label || x.address)}<span style="color:var(--faint);margin-left:6px;font-size:11px">${esc(hostSub(x))}</span></label>`)));
+
+  const form = openDrawer(v.id ? T('Edit VPN') : T('New VPN'), [
+    seg,
+    field(T('Name'), 'label', v.label, { placeholder: T('Office VPN') }),
+    cfg,
+    ovpnBox,
+    check(T('Disconnect when MrTerm closes'), 'disconnectOnQuit', v.disconnectOnQuit !== false),
+    heading(T('Assigned hosts')),
+    hostBox,
+  ], async () => {
+    const f = formValues(form);
+    if (!f.config.trim()) throw new Error(T('Configuration is missing.'));
+    if (type === 'wireguard' && !/\[Interface\]/i.test(f.config)) throw new Error(T('This does not look like a WireGuard configuration.'));
+    const item = { ...v, type, label: f.label.trim() || VPN_TYPES[type], config: f.config, disconnectOnQuit: f.disconnectOnQuit,
+      username: type === 'openvpn' ? f.username : '', password: type === 'openvpn' ? f.password : '' };
+    const saved = await call('vault:upsert', 'vpns', item);
+    for (const cb of $$('[data-host]', hostBox)) {
+      const hst = S.vault.hosts.find((x) => x.id === cb.dataset.host);
+      const want = cb.checked ? saved.id : (hst.vpnId === saved.id ? null : hst.vpnId || null);
+      if ((hst.vpnId || null) !== want) await call('vault:upsert', 'hosts', { ...hst, vpnId: want });
+    }
+    reload();
+  }, (() => { const b = h(`<button class="btn">${ICONS.folder}${T('File…')}</button>`); b.onclick = loadFile; return b; })());
+  async function loadFile() {
+    const f = await call('import:pickFile', T('VPN configuration'), ['conf', 'ovpn']);
+    if (!f) return;
+    $('[name=config]', form).value = f.content;
+    if (!$('[name=label]', form).value) $('[name=label]', form).value = f.name.replace(/\.(conf|ovpn)$/i, '');
+    setType(/\.ovpn$/i.test(f.name) || /^\s*(client|remote)\b/m.test(f.content) ? 'openvpn' : 'wireguard');
+  }
+  setType(type);
+  if (pick) loadFile();
+}
+
 // ============================================================ Known Hosts & Verlauf
 function viewKnown(page) {
   page.append(toolbar(T('Search known hosts …')));
@@ -838,6 +941,10 @@ async function viewSettings(page) {
   rdmBtn.onclick = importRdm;
   importCard.append(rdmBtn);
 
+  // ---- App-Sperre
+  const secCard = h(`<div class="settings-card"><h3>${T('App lock')}</h3><p style="color:var(--muted);margin-top:0">${T('Lock MrTerm with a password and/or a FIDO2 security key (e.g. YubiKey). The vault is then additionally encrypted and can only be opened with one of these methods.')}</p><div class="lock-rows"></div></div>`);
+  renderLockSettings($('.lock-rows', secCard));
+
   // ---- Updates
   const updCard = h(`<div class="settings-card"><h3>Updates</h3><p class="upd-info" style="color:var(--muted);margin-top:0">${T('Installed version: {v}', { v: '…' })}</p></div>`);
   api.call('app:version').then((v) => { $('.upd-info', updCard).textContent = T('Installed version: {v}', { v }); });
@@ -868,8 +975,121 @@ async function viewSettings(page) {
     <span>${C}+<kbd>1..9</kbd></span><span>${T('Switch to tab')}</span>
     <span>${C}+<kbd>Shift</kbd>+<kbd>C/V</kbd></span><span>${T('Copy / paste in terminal')}</span>
     <span>${C}+<kbd>Shift</kbd>+<kbd>F</kbd></span><span>${T('Search in terminal')}</span>
-    <span>${C}+<kbd>+/−/0</kbd></span><span>${T('Font size')}</span></div></div>`);
+    <span>${C}+<kbd>+/−/0</kbd></span><span>${T('Font size')}</span>
-  c.append(langCard, designCard, themeCard, termCard, rdpCard, importCard, dataCard, updCard, keysCard);
+    <span>${C}+<kbd>Shift</kbd>+<kbd>L</kbd></span><span>${T('Lock now')}</span></div></div>`);
+  c.append(langCard, secCard, designCard, themeCard, termCard, rdpCard, importCard, dataCard, updCard, keysCard);
+}
+
+// ============================================================ App-Sperre
+function showLock() {
+  if ($('.lock-screen')) return;
+  const m = S.lock.meta || {};
+  I18N.setLanguage(m.language, navigator.language);
+  applyStatic();
+  applyAppTheme(m);
+  closeDrawer();
+  $$('.ctx').forEach((x) => x.remove());
+  $('.palette')?.closest('.modal-bg')?.remove();
+  const el = h(`<div class="lock-screen"><div class="lock-box">
+    <img class="lock-logo" src="logo.png" alt=""/><h2>${T('MrTerm is locked')}</h2>
+    ${S.lock.hasPassword ? `<form class="lock-pw"><input type="password" name="pw" placeholder="${esc(T('Password'))}" autocomplete="off"/><button class="btn primary">${ICONS.unlock}${T('Unlock')}</button></form>` : ''}
+    ${S.lock.fido.length ? `<button class="btn lock-fido">${ICONS.key}${T('Unlock with security key')}</button>` : ''}
+    <div class="lock-err"></div></div></div>`);
+  const err = $('.lock-err', el);
+  const done = async () => { el.remove(); await reload(); };
+  const form = $('.lock-pw', el);
+  if (form) form.onsubmit = async (e) => {
+    e.preventDefault();
+    const inp = $('input', form);
+    err.textContent = '';
+    try { await api.call('lock:unlockPassword', inp.value); done(); } catch (x) { err.textContent = x.message; inp.select(); }
+  };
+  const fb = $('.lock-fido', el);
+  if (fb) fb.onclick = async () => {
+    err.textContent = ''; fb.disabled = true;
+    try { await api.call('lock:unlockFido'); done(); } catch (x) { err.textContent = x.message; }
+    fb.disabled = false;
+  };
+  document.body.append(el);
+  ($('input', el) || fb)?.focus();
+}
+
+async function lockNow() {
+  if (!S.lock?.enabled) return;
+  S.lock = await call('lock:lock');
+  if (S.lock.locked) showLock();
+}
+$('#lockBtn').onclick = lockNow;
+
+// Automatische Sperre nach Inaktivität (Einstellung autoLock in Minuten, 0 = aus)
+let lastActivity = Date.now();
+['keydown', 'mousedown', 'mousemove', 'wheel'].forEach((ev) => document.addEventListener(ev, () => { lastActivity = Date.now(); }, { capture: true, passive: true }));
+setInterval(() => {
+  const min = Number(S.vault?.settings.autoLock) || 0;
+  if (!min || !S.lock?.enabled || S.lock.locked || $('.lock-screen')) return;
+  // In einem eingebetteten RDP-Fenster sieht MrTerm keine Eingaben – dort nicht automatisch sperren
+  if (S.tabs.some((t) => t.id === S.active && t.kind === 'rdp')) { lastActivity = Date.now(); return; }
+  if (Date.now() - lastActivity > min * 60000) lockNow();
+}, 15000);
+
+function renderLockSettings(box) {
+  const L = S.lock;
+  box.innerHTML = '';
+  const refresh = (st) => { S.lock = st; $('#lockBtn').style.display = st.enabled ? '' : 'none'; renderLockSettings(box); };
+  const disableWarn = async () => (L.hasPassword ? 1 : 0) + L.fido.length > 1 || confirmBox(T('Disable app lock?'), T('This is the last unlock method. MrTerm will no longer be locked.'), T('Disable'));
+
+  // Passwort
+  const pwRow = h(`<div class="lock-row"><div class="grow"><b>${T('Password')}</b><div class="sub">${L.hasPassword ? T('Set') : T('Not set')}</div></div></div>`);
+  const pwBtn = h(`<button class="btn">${L.hasPassword ? T('Change password') : T('Set password')}</button>`);
+  pwBtn.onclick = async () => {
+    const r = await modal({ title: L.hasPassword ? T('Change password') : T('Set password'),
+      body: `<div class="field"><label>${T('New password')}</label><input name="a" type="password" autocomplete="off"/></div><div class="field"><label>${T('Repeat password')}</label><input name="b" type="password" autocomplete="off"/></div>`,
+      buttons: [{ label: T('Cancel'), value: null, cls: 'ghost' }, { label: T('Save'), value: 'form', cls: 'primary' }] });
+    if (!r) return;
+    if (r.a !== r.b) return toast(T('The passwords do not match.'), 'error');
+    try { refresh(await call('lock:setPassword', r.a)); toast(T('Password saved'), 'ok'); } catch {}
+  };
+  pwRow.append(pwBtn);
+  if (L.hasPassword) {
+    const rm = h(`<button class="btn ghost" title="${esc(T('Remove'))}">${ICONS.trash}</button>`);
+    rm.onclick = async () => { if (await disableWarn()) refresh(await call('lock:removePassword')); };
+    pwRow.append(rm);
+  }
+  box.append(pwRow);
+
+  // Sicherheitsschlüssel
+  for (const k of L.fido) {
+    const row = h(`<div class="lock-row"><div class="grow"><b>${ICONS.key}${esc(k.label)}</b><div class="sub">${T('Security key (FIDO2)')}</div></div></div>`);
+    const rm = h(`<button class="btn ghost" title="${esc(T('Remove'))}">${ICONS.trash}</button>`);
+    rm.onclick = async () => { if (await disableWarn() && await confirmBox(T('Remove security key?'), k.label, T('Remove'))) refresh(await call('lock:removeFido', k.id)); };
+    row.append(rm);
+    box.append(row);
+  }
+  const add = h(`<button class="btn">${ICONS.plus}${T('Add security key')}</button>`);
+  add.onclick = async () => {
+    const label = await promptBox(T('Add security key'), T('Name'), 'YubiKey');
+    if (label == null) return;
+    add.disabled = true;
+    try { refresh(await call('lock:addFido', label)); toast(T('Security key added'), 'ok'); } catch {}
+    add.disabled = false;
+  };
+  const actions = h('<div class="row" style="flex-wrap:wrap;margin-top:12px"></div>');
+  actions.append(add);
+  if (L.enabled) {
+    const now = h(`<button class="btn primary">${ICONS.lock}${T('Lock now')}</button>`);
+    now.onclick = lockNow;
+    actions.append(now);
+  }
+  box.append(actions);
+
+  if (L.enabled) {
+    const al = field(T('Lock automatically after inactivity'), 'autoLock', String(settings().autoLock || 0), { type: 'select',
+      options: [['0', T('Never')], ...[1, 5, 10, 15, 30, 60].map((n) => [String(n), T('{n} minutes', { n })])] });
+    al.style.marginTop = '14px';
+    al.onchange = async () => { const v = Number($('select', al).value); await call('vault:settings', { autoLock: v }); S.vault.settings.autoLock = v; };
+    box.append(al);
+    box.append(h(`<div class="hint" style="color:var(--faint);font-size:11px;margin-top:10px">${T('If you forget the password and lose all security keys, the vault cannot be recovered.')}</div>`));
+  }
 }
 
 // ============================================================ Design
@@ -878,8 +1098,7 @@ function termTheme() {
   if (id === 'auto') return TERM_THEMES[(APP_THEMES[settings().appTheme] || APP_THEMES.midnight).term] || TERM_THEMES.mrterm;
   return TERM_THEMES[id] || TERM_THEMES.mrterm;
 }
-function applyAppTheme() {
+function applyAppTheme(st = settings()) {
-  const st = settings();
   const root = document.documentElement;
   if (st.appTheme && st.appTheme !== 'midnight') root.dataset.theme = st.appTheme; else delete root.dataset.theme;
   if (st.accent) root.style.setProperty('--accent', st.accent); else root.style.removeProperty('--accent');
@@ -943,7 +1162,7 @@ function addTab(session) {
   tab.onclick = (e) => { if (e.target.closest('.x')) return closeTab(session.id); activateTab(session.id); };
   tab.onauxclick = (e) => { if (e.button === 1) closeTab(session.id); };
   tab.oncontextmenu = (e) => ctxMenu(e.clientX, e.clientY, [
-    ...(session.host ? [{ label: T('Duplicate'), icon: 'dup', run: () => (session.kind === 'sftp' ? openSftp(session.host) : openTerminal(session.host)) }] : []),
+    ...(session.host ? [{ label: T('Duplicate'), icon: 'dup', run: () => ({ sftp: openSftp, docker: openDocker, firewall: openFirewall, network: openNetwork }[session.kind] || openTerminal)(session.host) }] : []),
     ...(session.kind === 'ssh' ? [{ label: T('Reconnect'), icon: 'refresh', run: () => session.reconnect() }] : []),
     { label: T('Rename'), icon: 'edit', run: async () => { const n = await promptBox(T('Rename tab'), T('Title'), session.title); if (n) { session.title = n; $('span:nth-child(2)', tab).textContent = n; } } },
     '-', { label: T('Close'), icon: 'close', run: () => closeTab(session.id) },
@@ -990,6 +1209,7 @@ class TerminalSession {
     this.el = h(`<div class="session">
       <div class="sbar"><div class="info">${avatar(host, 22).replace('<span class="proto">SSH</span>', '')}<span>${esc(hostSub(host))}</span></div>
         <button class="btn ghost sm" data-a="sftp" title="${T('SFTP for this host')}">${ICONS.folder}SFTP</button>
+        ${host.execCommand ? '' : `<button class="btn ghost sm" data-a="docker" title="${T('Docker containers')}">${ICONS.docker}Docker</button><button class="btn ghost sm" data-a="firewall" title="${T('Firewall')}">${ICONS.wall}${T('Firewall')}</button><button class="btn ghost sm" data-a="network" title="${T('Network')}">${ICONS.network}${T('Network')}</button>`}
         <button class="btn ghost sm" data-a="snip" title="Snippets">${ICONS.code}Snippets</button>
         <button class="btn ghost sm" data-a="find" title="${T('Search (Ctrl+Shift+F)')}">${ICONS.search}</button>
       </div>
@@ -1018,6 +1238,7 @@ class TerminalSession {
     this.term.loadAddon(this.search);
     this.term.loadAddon(new WebLinksAddon.WebLinksAddon((_e, url) => api.call('shell:open', url)));
     this.term.open($('.term', this.el));
+    $('.term', this.el).style.background = termTheme().background; // Innenabstand in Terminalfarbe
     this.term.onData((d) => { if (this.alive) api.ssh.write(this.id, d); else if (d === '\r' && this.ended) this.reconnect(); });
     this.term.onResize(({ cols, rows }) => { if (this.alive) api.ssh.resize(this.id, cols, rows); });
     this.term.onSelectionChange(() => { if (settings().copyOnSelect && this.term.hasSelection()) api.call('clipboard:write', this.term.getSelection()); });
@@ -1027,7 +1248,7 @@ class TerminalSession {
       if (e.ctrlKey && e.shiftKey && e.code === 'KeyV') { this.paste(); return false; }
       if (e.ctrlKey && e.shiftKey && e.code === 'KeyF') { this.toggleFind(true); return false; }
       // App-Kürzel im Terminal nur mit Strg+Shift, damit Strg+W/K/T (nano, bash, …) im Terminal ankommen
-      if (e.ctrlKey && e.shiftKey && ['KeyK', 'KeyT', 'KeyW'].includes(e.code)) return false;
+      if (e.ctrlKey && e.shiftKey && ['KeyK', 'KeyT', 'KeyW', 'KeyL'].includes(e.code)) return false;
       if (e.ctrlKey && e.code === 'Tab') return false;
       if (e.ctrlKey && /^Digit[1-9]$/.test(e.code)) return false;
       if (e.ctrlKey && (e.key === '+' || e.key === '=' || e.key === '-' || e.key === '0')) { this.zoom(e.key); return false; }
@@ -1046,6 +1267,9 @@ class TerminalSession {
     this.el.addEventListener('click', (e) => {
       const a = e.target.closest('[data-a]')?.dataset.a;
       if (a === 'sftp') openSftp(this.host);
+      if (a === 'docker') openDocker(this.host);
+      if (a === 'firewall') openFirewall(this.host);
+      if (a === 'network') openNetwork(this.host);
       if (a === 'snip') { $('.snip-panel', this.el).classList.toggle('open'); this.renderSnips(); this.doFit(); }
       if (a === 'snipnew') editSnippet();
       if (a === 'find') this.toggleFind();
@@ -1091,6 +1315,7 @@ class TerminalSession {
   applySettings() {
     const st = settings();
     Object.assign(this.term.options, { fontFamily: st.fontFamily, fontSize: st.fontSize, cursorStyle: st.cursorStyle, cursorBlink: st.cursorBlink, scrollback: st.scrollback, theme: termTheme() });
+    $('.term', this.el).style.background = termTheme().background;
     this.doFit();
   }
 
@@ -1114,7 +1339,7 @@ class TerminalSession {
     this.showOverlay(T('Connecting to {host} …', { host: this.host.address }));
     this.doFit();
     try {
-      await api.call('ssh:open', this.id, this.host.id || this.host, { cols: this.term.cols, rows: this.term.rows });
+      await api.call('ssh:open', this.id, hostRef(this.host), { cols: this.term.cols, rows: this.term.rows });
       this.alive = true;
       this.hideOverlay();
       setTabState(this, 'on');
@@ -1152,7 +1377,7 @@ function openTerminal(host) { return new TerminalSession(host); }
 // Deshalb wird es ausgeblendet, solange ein Dialog, Menü oder die Befehlspalette offen ist.
 S.covered = false;
 function updateCover() {
-  const covered = !!document.querySelector('.modal-bg, .ctx');
+  const covered = !!document.querySelector('.modal-bg, .ctx, .lock-screen');
   if (covered === S.covered) return;
   S.covered = covered;
   const t = S.tabs.find((x) => x.id === S.active && x.kind === 'rdp');
@@ -1447,6 +1672,569 @@ class SftpSession {
 }
 function openSftp(host) { return new SftpSession(host); }
 
+// Gespeicherte Hosts per ID übergeben; Container-Shells mit Zusatzbefehl
+const hostRef = (host) => (host.id ? (host.execCommand ? { ref: host.id, execCommand: host.execCommand, label: host.label } : host.id) : host);
+
+// ============================================================ Docker (Container über SSH)
+class DockerSession {
+  constructor(host) {
+    this.kind = 'docker'; this.id = uid(); this.host = host;
+    this.title = `Docker · ${host.label || host.address}`;
+    this.containers = []; this.stats = {}; this.filter = ''; this.showStopped = true;
+    this.el = h(`<div class="session docker">
+      <div class="sbar"><div class="info">${avatar(host, 22)}<span>${esc(hostSub(host))}</span><span class="rt"></span></div>
+        <label class="search sm">${ICONS.search}<input placeholder="${esc(T('Search containers …'))}"/></label>
+        <label class="check" style="margin:0 6px"><input type="checkbox" data-a="stopped" checked/>${T('Show stopped')}</label>
+        <button class="btn ghost sm" data-a="refresh" title="${T('Refresh')}">${ICONS.refresh}</button>
+      </div>
+      <div class="docker-body"><div class="pane-empty"><div class="spinner" style="width:30px;height:30px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .9s linear infinite"></div><div>${esc(T('Connecting to {host} …', { host: host.address }))}</div></div></div></div>`);
+    this.body = $('.docker-body', this.el);
+    $('.search input', this.el).oninput = (e) => { this.filter = e.target.value.toLowerCase(); this.draw(); };
+    this.el.addEventListener('click', (e) => { if (e.target.closest('[data-a=refresh]')) this.refresh(true); });
+    $('[data-a=stopped]', this.el).onchange = (e) => { this.showStopped = e.target.checked; this.draw(); };
+    this.unsub = api.on('docker:closed', (sid) => { if (sid === this.id) { setTabState(this, 'err'); this.error(T('Connection closed.')); } });
+    addTab(this);
+    this.open();
+  }
+
+  async open() {
+    try {
+      this.apply(await api.call('docker:open', this.id, hostRef(this.host)));
+      setTabState(this, 'on');
+      this.loadStats();
+      this.timer = setInterval(() => { if (S.active === this.id && !$('.modal-bg')) this.refresh(); }, 10000);
+    } catch (e) {
+      setTabState(this, 'err');
+      this.error(e.message);
+    }
+  }
+
+  error(msg) {
+    this.body.innerHTML = `<div class="pane-empty"><div style="color:var(--red);max-width:520px;text-align:center">${esc(msg)}</div></div>`;
+    const b = h(`<button class="btn primary">${ICONS.refresh}${T('Try again')}</button>`);
+    b.onclick = () => { closeTab(this.id); openDocker(this.host); };
+    $('.pane-empty', this.body).append(b);
+  }
+
+  apply(r) {
+    this.containers = r.containers;
+    $('.rt', this.el).textContent = ` · ${r.runtime === 'podman' ? 'Podman' : 'Docker'}${r.sudo ? ' (sudo)' : ''}`;
+    this.draw();
+  }
+
+  async refresh(withStats) {
+    if (this.busy) return;
+    this.busy = true;
+    try { this.apply(await api.call('docker:list', this.id)); if (withStats) this.loadStats(); } catch (e) { if (withStats) toast(e.message, 'error'); }
+    this.busy = false;
+  }
+
+  async loadStats() {
+    try { this.stats = await api.call('docker:stats', this.id); this.draw(); } catch {}
+  }
+
+  draw() {
+    const running = (c) => c.state === 'running';
+    const list = this.containers
+      .filter((c) => (this.showStopped || running(c)) && (!this.filter || [c.name, c.image, c.id, c.ports].some((f) => String(f || '').toLowerCase().includes(this.filter))))
+      .sort((a, b) => (running(b) - running(a)) || a.name.localeCompare(b.name, undefined, { numeric: true }));
+    if (!this.containers.length) { this.body.innerHTML = `<div class="pane-empty"><div style="color:var(--muted)">${T('No containers on this host.')}</div></div>`; return; }
+    const scroll = this.body.scrollTop;
+    this.body.innerHTML = `<table class="docker-table"><thead><tr><th></th><th>${T('Name')}</th><th>${T('Status')}</th><th>${T('Ports')}</th><th class="num">CPU</th><th class="num">${T('Memory')}</th><th></th></tr></thead><tbody>
+      ${list.map((c) => {
+        const st = this.stats[c.id];
+        const on = running(c);
+        return `<tr data-id="${esc(c.id)}"><td><span class="dot ${on ? 'on' : c.state === 'paused' || c.state === 'restarting' ? 'wait' : ''}"></span></td>
+          <td class="name"><div><b>${esc(c.name)}</b><span class="img">${esc(c.image)}</span></div></td>
+          <td class="muted">${esc(c.status)}</td><td class="muted ports" title="${esc(c.ports)}">${esc(c.ports)}</td>
+          <td class="num">${on && st ? esc(st.cpu) : ''}</td><td class="num">${on && st ? esc(st.mem.split('/')[0].trim()) : ''}</td>
+          <td class="acts">
+            ${on ? `<button class="btn ghost sm" data-c="shell" title="${T('Open shell')}">${ICONS.term}</button>` : ''}
+            <button class="btn ghost sm" data-c="logs" title="${T('Logs')}">${ICONS.logs}</button>
+            ${on ? `<button class="btn ghost sm" data-c="restart" title="${T('Restart')}">${ICONS.refresh}</button><button class="btn ghost sm" data-c="stop" title="${T('Stop')}">${ICONS.stop}</button>`
+              : `<button class="btn ghost sm" data-c="start" title="${T('Start')}">${ICONS.play}</button><button class="btn ghost sm" data-c="remove" title="${T('Delete')}">${ICONS.trash}</button>`}
+          </td></tr>`;
+      }).join('')}</tbody></table>`;
+    this.body.scrollTop = scroll;
+    $$('tr[data-id]', this.body).forEach((tr) => {
+      const c = this.containers.find((x) => x.id === tr.dataset.id);
+      tr.onclick = (e) => { const a = e.target.closest('[data-c]')?.dataset.c; if (a) this.act(a, c, e.target.closest('button')); };
+      tr.ondblclick = (e) => { if (!e.target.closest('[data-c]') && running(c)) this.act('shell', c); };
+      tr.oncontextmenu = (e) => ctxMenu(e.clientX, e.clientY, [
+        ...(running(c) ? [{ label: T('Open shell'), icon: 'term', run: () => this.act('shell', c) }] : []),
+        { label: T('Logs'), icon: 'logs', run: () => this.act('logs', c) },
+        '-',
+        ...(running(c) ? [{ label: T('Restart'), icon: 'refresh', run: () => this.act('restart', c) }, { label: T('Stop'), icon: 'stop', run: () => this.act('stop', c) }]
+          : [{ label: T('Start'), icon: 'play', run: () => this.act('start', c) }]),
+        { label: T('Copy ID'), icon: 'copy', run: () => api.call('clipboard:write', c.id) },
+        '-',
+        { label: T('Delete'), icon: 'trash', danger: true, run: () => this.act('remove', c) },
+      ]);
+    });
+  }
+
+  async act(a, c, btn) {
+    if (a === 'shell' || a === 'logs') {
+      const cmd = await call('docker:command', this.id, a, c.id);
+      openTerminal({ ...this.host, execCommand: cmd, label: `${a === 'logs' ? T('Logs') : '🐳'} ${c.name}` });
+      return;
+    }
+    if (a === 'remove' && !(await confirmBox(T('Delete container?'), T('“{name}” will be removed including its writable layer. Volumes are kept.', { name: c.name })))) return;
+    if (a === 'stop' && !(await confirmBox(T('Stop container?'), c.name, T('Stop')))) return;
+    if (btn) { btn.disabled = true; btn.innerHTML = '<span class="spinner sm"></span>'; }
+    try { await call('docker:action', this.id, a, c.id); toast(T('{action}: {name}', { action: { start: T('Started'), stop: T('Stopped'), restart: T('Restarted'), remove: T('Deleted') }[a], name: c.name }), 'ok'); } catch {}
+    await this.refresh(true);
+  }
+
+  onShow() { if (this.containers.length) this.refresh(); }
+  dispose() { clearInterval(this.timer); this.unsub(); api.call('docker:close', this.id).catch(() => {}); }
+}
+function openDocker(host) { return new DockerSession(host); }
+
+// ============================================================ Firewall (UFW / iptables über SSH)
+class FirewallSession {
+  constructor(host) {
+    this.kind = 'firewall'; this.id = uid(); this.host = host;
+    this.title = `${T('Firewall')} · ${host.label || host.address}`;
+    this.backend = null; this.data = null;
+    this.el = h(`<div class="session firewall">
+      <div class="sbar"><div class="info">${avatar(host, 22)}<span>${esc(hostSub(host))}</span><span class="rt"></span></div>
+        <div class="seg sm backends"></div>
+        <button class="btn ghost sm" data-a="save" style="display:none" title="${esc(T('Save the current iptables rules so they survive a reboot'))}">${ICONS.download}${T('Save permanently')}</button>
+        <button class="btn ghost sm" data-a="refresh" title="${T('Refresh')}">${ICONS.refresh}</button>
+        <button class="btn primary sm" data-a="add" disabled>${ICONS.plus}${T('Add rule')}</button>
+      </div>
+      <div class="docker-body fw-body"><div class="pane-empty"><div class="spinner" style="width:30px;height:30px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .9s linear infinite"></div><div>${esc(T('Connecting to {host} …', { host: host.address }))}</div></div></div></div>`);
+    this.body = $('.fw-body', this.el);
+    this.el.addEventListener('click', (e) => {
+      const a = e.target.closest('[data-a]')?.dataset.a;
+      if (a === 'refresh') this.refresh();
+      if (a === 'add') this.backend === 'ufw' ? this.addUfw() : this.addIpt();
+      if (a === 'save') this.op('ipt', 'save', {}, T('Rules saved permanently'));
+    });
+    this.unsub = api.on('firewall:closed', (sid) => { if (sid === this.id) { setTabState(this, 'err'); this.error(T('Connection closed.')); } });
+    addTab(this);
+    this.open();
+  }
+
+  async open() {
+    try {
+      const r = await api.call('firewall:open', this.id, hostRef(this.host));
+      $('.rt', this.el).textContent = r.sudo ? ' · sudo' : ' · root';
+      const opts = [...(r.tools.includes('ufw') ? [['ufw', 'UFW']] : []), ...(r.tools.includes('iptables') ? [['iptables', 'iptables']] : []), ...(r.tools.includes('ip6tables') ? [['ip6tables', 'ip6tables']] : [])];
+      const seg = $('.backends', this.el);
+      opts.forEach(([id, l]) => { const b = h(`<button data-b="${id}">${l}</button>`); b.onclick = () => this.switchTo(id); seg.append(b); });
+      setTabState(this, 'on');
+      $('[data-a=add]', this.el).disabled = false;
+      await this.switchTo(opts[0][0]);
+    } catch (e) {
+      setTabState(this, 'err');
+      this.error(e.message);
+    }
+  }
+
+  error(msg) {
+    this.body.innerHTML = `<div class="pane-empty"><div style="color:var(--red);max-width:560px;text-align:center">${esc(msg)}</div></div>`;
+    const b = h(`<button class="btn primary">${ICONS.refresh}${T('Try again')}</button>`);
+    b.onclick = () => { closeTab(this.id); openFirewall(this.host); };
+    $('.pane-empty', this.body).append(b);
+  }
+
+  async switchTo(b) {
+    this.backend = b;
+    $$('.backends button', this.el).forEach((x) => x.classList.toggle('active', x.dataset.b === b));
+    $('[data-a=save]', this.el).style.display = b === 'ufw' ? 'none' : '';
+    $('[data-a=add]', this.el).disabled = false;
+    await this.refresh();
+  }
+
+  async refresh() {
+    try { this.data = await api.call('firewall:list', this.id, this.backend); this.draw(); } catch (e) { toast(e.message, 'error'); }
+  }
+
+  // Aktion ausführen, danach neu laden
+  async op(kind, op, args, okMsg) {
+    try { await call(kind === 'ufw' ? 'firewall:ufw' : 'firewall:ipt', this.id, op, args); if (okMsg) toast(okMsg, 'ok'); } catch { return false; }
+    await this.refresh();
+    return true;
+  }
+
+  sshPort() { return String(this.host.port || 22); }
+
+  draw() {
+    const scroll = this.body.scrollTop;
+    this.body.innerHTML = '';
+    if (this.backend === 'ufw') this.drawUfw(); else this.drawIpt();
+    this.body.scrollTop = scroll;
+  }
+
+  drawUfw() {
+    const d = this.data;
+    const on = d.status === 'active';
+    const head = h(`<div class="fw-head"><span class="status-pill ${on ? 'on' : ''}">${on ? T('active') : T('inactive')}</span></div>`);
+    const tgl = h(`<button class="btn sm ${on ? '' : 'primary'}">${on ? T('Disable') : T('Enable')}</button>`);
+    tgl.onclick = async () => {
+      if (on) { if (await confirmBox(T('Disable firewall?'), T('All UFW rules will stop filtering traffic.'), T('Disable'))) this.op('ufw', 'disable', {}); return; }
+      const sshOk = d.rules.some((r) => r.action !== 'DENY' && r.action !== 'REJECT' && r.dir === 'IN' && new RegExp(`(^|[^0-9])${this.sshPort()}(/tcp)?($|[^0-9])|OpenSSH|ssh`, 'i').test(r.to));
+      if (!sshOk) {
+        const r = await modal({ title: T('Enable firewall?'), text: T('There is no rule that allows SSH (port {port}). Enabling UFW could lock you out of this server.', { port: this.sshPort() }),
+          buttons: [{ label: T('Cancel'), value: null, cls: 'ghost' }, { label: T('Enable anyway'), value: 'force', cls: 'danger' }, { label: T('Allow SSH and enable'), value: 'ssh', cls: 'primary' }] });
+        if (!r) return;
+        if (r === 'ssh' && !(await this.op('ufw', 'add', { action: 'allow', dir: 'in', port: this.sshPort(), proto: 'tcp', comment: 'SSH (MrTerm)' }))) return;
+      }
+      this.op('ufw', 'enable', {}, T('Firewall enabled'));
+    };
+    head.append(tgl);
+    if (d.defaults) {
+      for (const dir of ['incoming', 'outgoing']) {
+        const sel = h(`<label class="fw-def">${dir === 'incoming' ? T('Incoming') : T('Outgoing')}<select>${['allow', 'deny', 'reject'].map((p) => `<option value="${p}" ${d.defaults[dir] === p ? 'selected' : ''}>${{ allow: T('Allow'), deny: T('Deny'), reject: T('Reject') }[p]}</option>`).join('')}</select></label>`);
+        $('select', sel).onchange = async (e) => {
+          const pol = e.target.value;
+          if (dir === 'incoming' && pol !== 'allow' && on && !(await confirmBox(T('Change default policy?'), T('Incoming connections without a matching rule will be blocked. Make sure SSH is allowed.'), T('Change')))) return this.draw();
+          this.op('ufw', 'default', { policy: pol, dir });
+        };
+        head.append(sel);
+      }
+    }
+    this.body.append(head);
+    $('[data-a=add]', this.el).disabled = !on;
+    if (!on) {
+      this.body.append(h(`<div class="pane-empty" style="height:auto;padding:48px 20px"><div class="fw-off">${ICONS.wall}<b>${T('UFW is disabled')}</b><span>${T('Enable UFW to view or add rules.')}</span></div></div>`));
+      return;
+    }
+    if (!d.rules.length) { this.body.append(h(`<div class="pane-empty" style="height:auto;padding:40px"><div style="color:var(--muted)">${T('No rules yet.')}</div></div>`)); return; }
+    const t = h(`<table class="docker-table fw-table"><thead><tr><th>#</th><th>${T('To')}</th><th>${T('Action')}</th><th>${T('From')}</th><th>${T('Comment')}</th><th></th></tr></thead><tbody></tbody></table>`);
+    for (const r of d.rules) {
+      const tr = h(`<tr><td class="num">${r.num}</td><td><b>${esc(r.to)}</b></td><td><span class="fw-act ${r.action.toLowerCase()}">${esc(r.action)} ${esc(r.dir)}</span></td><td class="muted">${esc(r.from)}</td><td class="muted">${esc(r.comment)}</td>
+        <td class="acts"><button class="btn ghost sm" title="${esc(T('Delete'))}">${ICONS.trash}</button></td></tr>`);
+      $('button', tr).onclick = async () => { if (await confirmBox(T('Delete rule?'), `${r.to} · ${r.action} ${r.dir} · ${r.from}`)) this.op('ufw', 'delete', { num: r.num }, T('Rule deleted')); };
+      $('tbody', t).append(tr);
+    }
+    this.body.append(t);
+  }
+
+  drawIpt() {
+    const fam = this.backend === 'ip6tables' ? 6 : 4;
+    const builtin = ['INPUT', 'FORWARD', 'OUTPUT'];
+    const chains = [...this.data.chains].sort((a, b) => ((builtin.indexOf(a.name) + 1 || 99) - (builtin.indexOf(b.name) + 1 || 99)));
+    this.body.append(h(`<div class="fw-note">${T('Changes apply immediately but are lost after a reboot unless you click “Save permanently”.')}</div>`));
+    for (const c of chains) {
+      const sec = h(`<div class="fw-chain"><div class="fw-chain-head"><b>${esc(c.name)}</b><span class="muted">${c.rules.length} ${T('rules')}</span></div></div>`);
+      if (c.policy && builtin.includes(c.name)) {
+        const sel = h(`<label class="fw-def">${T('Policy')}<select>${['ACCEPT', 'DROP'].map((p) => `<option ${c.policy === p ? 'selected' : ''}>${p}</option>`).join('')}</select></label>`);
+        $('select', sel).onchange = async (e) => {
+          if (e.target.value === 'DROP' && c.name !== 'FORWARD' && !(await confirmBox(T('Change default policy?'), T('Traffic without a matching ACCEPT rule will be dropped. Make sure SSH is allowed, or you may lock yourself out.'), T('Change')))) return this.draw();
+          this.op('ipt', 'policy', { family: fam, chain: c.name, policy: e.target.value });
+        };
+        $('.fw-chain-head', sec).append(sel);
+      }
+      if (c.rules.length) {
+        const t = h(`<table class="docker-table fw-table"><tbody></tbody></table>`);
+        for (const r of c.rules) {
+          const tgt = (r.spec.match(/-j (\S+)/) || [])[1] || '';
+          const tr = h(`<tr><td class="num" style="width:36px">${r.num}</td><td class="mono spec">${esc(r.spec)}</td><td style="width:90px"><span class="fw-act ${tgt === 'ACCEPT' ? 'allow' : /DROP|REJECT/.test(tgt) ? 'deny' : ''}">${esc(tgt)}</span></td>
+            <td class="acts" style="width:50px"><button class="btn ghost sm" title="${esc(T('Delete'))}">${ICONS.trash}</button></td></tr>`);
+          $('button', tr).onclick = async () => { if (await confirmBox(T('Delete rule?'), `${c.name} #${r.num}: ${r.spec}`)) this.op('ipt', 'delete', { family: fam, chain: c.name, num: r.num }, T('Rule deleted')); };
+          $('tbody', t).append(tr);
+        }
+        sec.append(t);
+      }
+      this.body.append(sec);
+    }
+  }
+
+  async addUfw() {
+    const r = await modal({ title: T('Add UFW rule'), body: `
+      <div class="row"><div class="field"><label>${T('Action')}</label><select name="action"><option value="allow">${T('Allow')}</option><option value="deny">${T('Deny')}</option><option value="reject">${T('Reject')}</option><option value="limit">${T('Limit (rate-limit)')}</option></select></div>
+        <div class="field"><label>${T('Direction')}</label><select name="dir"><option value="in">${T('Incoming')}</option><option value="out">${T('Outgoing')}</option></select></div></div>
+      <div class="row"><div class="field"><label>${T('Port')}</label><input name="port" placeholder="22, 80,443, 6000:6010"/></div>
+        <div class="field small"><label>${T('Protocol')}</label><select name="proto"><option value="any">${T('Any')}</option><option value="tcp">TCP</option><option value="udp">UDP</option></select></div></div>
+      <div class="field"><label>${T('From (IP or network)')}</label><input name="from" placeholder="any, 192.168.0.0/24"/></div>
+      <div class="field"><label>${T('Comment')}</label><input name="comment" placeholder="${esc(T('optional'))}"/></div>
+      <label class="check"><input type="checkbox" name="top"/>${T('Insert at the top (highest priority)')}</label>`,
+      buttons: [{ label: T('Cancel'), value: null, cls: 'ghost' }, { label: T('Add'), value: 'form', cls: 'primary' }] });
+    if (!r) return;
+    this.op('ufw', 'add', { ...r, port: r.port.replace(/\s/g, ''), from: r.from.trim() || 'any', comment: r.comment.trim() }, T('Rule added'));
+  }
+
+  async addIpt() {
+    const fam = this.backend === 'ip6tables' ? 6 : 4;
+    const chains = this.data.chains.map((c) => c.name);
+    const r = await modal({ title: T('Add {bin} rule', { bin: this.backend }), body: `
+      <div class="row"><div class="field"><label>${T('Chain')}</label><select name="chain">${chains.map((c) => `<option ${c === 'INPUT' ? 'selected' : ''}>${esc(c)}</option>`).join('')}</select></div>
+        <div class="field"><label>${T('Target')}</label><select name="target"><option>ACCEPT</option><option>DROP</option><option>REJECT</option><option>LOG</option><option>RETURN</option></select></div></div>
+      <div class="row"><div class="field small"><label>${T('Protocol')}</label><select name="proto"><option value="tcp">TCP</option><option value="udp">UDP</option><option value="${fam === 6 ? 'icmpv6' : 'icmp'}">ICMP</option><option value="all">${T('Any')}</option></select></div>
+        <div class="field"><label>${T('Port')}</label><input name="port" placeholder="22, 80,443, 6000:6010"/></div></div>
+      <div class="row"><div class="field"><label>${T('Source (IP or network)')}</label><input name="source" placeholder="any, ${fam === 6 ? 'fd00::/8' : '192.168.0.0/24'}"/></div>
+        <div class="field small"><label>${T('Interface')}</label><input name="iface" placeholder="eth0"/></div></div>
+      <div class="field"><label>${T('Connection state')}</label><select name="state"><option value="">${T('Any')}</option><option value="NEW">NEW</option><option value="ESTABLISHED,RELATED">ESTABLISHED,RELATED</option></select></div>
+      <div class="field"><label>${T('Comment')}</label><input name="comment" placeholder="${esc(T('optional'))}"/></div>
+      <label class="check"><input type="checkbox" name="top" checked/>${T('Insert at the top (highest priority)')}</label>`,
+      buttons: [{ label: T('Cancel'), value: null, cls: 'ghost' }, { label: T('Add'), value: 'form', cls: 'primary' }] });
+    if (!r) return;
+    this.op('ipt', 'add', { ...r, family: fam, port: r.port.replace(/\s/g, ''), source: r.source.trim(), iface: r.iface.trim(), comment: r.comment.trim() }, T('Rule added'));
+  }
+
+  dispose() { this.unsub(); api.call('firewall:close', this.id).catch(() => {}); }
+}
+function openFirewall(host) { return new FirewallSession(host); }
+
+// ============================================================ Netzwerk (Ubuntu netplan / Debian ifupdown über SSH)
+const NET_KINDS = { ethernet: 'Ethernet', bond: 'Bond', bridge: 'Bridge', vlan: 'VLAN' };
+const BOND_MODES = [['802.3ad', '802.3ad (LACP)'], ['active-backup', 'active-backup'], ['balance-rr', 'balance-rr'], ['balance-xor', 'balance-xor'], ['balance-tlb', 'balance-tlb'], ['balance-alb', 'balance-alb'], ['broadcast', 'broadcast']];
+const VIRTUAL_IF = /^(veth|docker\d|br-[0-9a-f]{12}|tap\d|fwbr|fwpr|fwln|vnet|virbr|cali|flannel|cni|kube|tun|wg|tailscale|zt)/;
+const splitList = (v) => String(v || '').split(/[\s,;]+/).map((x) => x.trim()).filter(Boolean);
+
+class NetworkSession {
+  constructor(host) {
+    this.kind = 'network'; this.id = uid(); this.host = host;
+    this.title = `${T('Network')} · ${host.label || host.address}`;
+    this.data = null; this.showVirtual = false;
+    this.el = h(`<div class="session network">
+      <div class="sbar"><div class="info">${avatar(host, 22)}<span>${esc(hostSub(host))}</span><span class="rt"></span></div>
+        <label class="check" style="margin:0 6px"><input type="checkbox" data-a="virtual"/>${T('Show virtual interfaces')}</label>
+        <button class="btn ghost sm" data-a="files">${ICONS.file}${T('Config files')}</button>
+        <button class="btn ghost sm" data-a="refresh" title="${T('Refresh')}">${ICONS.refresh}</button>
+        <button class="btn primary sm" data-a="new" disabled>${ICONS.plus}${T('New interface')}</button>
+      </div>
+      <div class="docker-body net-body"><div class="pane-empty"><div class="spinner" style="width:30px;height:30px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .9s linear infinite"></div><div>${esc(T('Connecting to {host} …', { host: host.address }))}</div></div></div></div>`);
+    this.body = $('.net-body', this.el);
+    this.el.addEventListener('click', (e) => {
+      const a = e.target.closest('[data-a]')?.dataset.a;
+      if (a === 'refresh') this.refresh();
+      if (a === 'files') this.files();
+      if (a === 'new') ctxMenu(e.clientX, e.clientY, [
+        { label: T('New bond'), icon: 'plus', run: () => this.edit(null, 'bond') },
+        { label: T('New bridge'), icon: 'plus', run: () => this.edit(null, 'bridge') },
+        { label: T('New VLAN'), icon: 'plus', run: () => this.edit(null, 'vlan') },
+      ]);
+    });
+    $('[data-a=virtual]', this.el).onchange = (e) => { this.showVirtual = e.target.checked; this.draw(); };
+    this.unsub = api.on('network:closed', (sid) => { if (sid === this.id && !this.applying) { setTabState(this, 'err'); this.error(T('Connection closed.')); } });
+    addTab(this);
+    this.open();
+  }
+
+  async open() {
+    try {
+      this.apply(await api.call('network:open', this.id, hostRef(this.host)));
+      setTabState(this, 'on');
+    } catch (e) { setTabState(this, 'err'); this.error(e.message); }
+  }
+
+  error(msg) {
+    this.body.innerHTML = `<div class="pane-empty"><div style="color:var(--red);max-width:560px;text-align:center">${esc(msg)}</div></div>`;
+    const b = h(`<button class="btn primary">${ICONS.refresh}${T('Try again')}</button>`);
+    b.onclick = () => { closeTab(this.id); openNetwork(this.host); };
+    $('.pane-empty', this.body).append(b);
+  }
+
+  apply(d) {
+    this.data = d;
+    const be = { netplan: 'netplan', ifupdown: 'ifupdown', networkmanager: 'NetworkManager', networkd: 'systemd-networkd' }[d.backend] || d.backend;
+    $('.rt', this.el).textContent = ` · ${d.os || ''} · ${be}`;
+    $('[data-a=new]', this.el).disabled = !d.editable;
+    this.draw();
+  }
+
+  async refresh() {
+    try { this.apply(await api.call('network:read', this.id)); } catch (e) { toast(e.message, 'error'); }
+  }
+
+  cfg(name) { return this.data.config.find((c) => c.name === name); }
+
+  draw() {
+    const d = this.data;
+    const scroll = this.body.scrollTop;
+    this.body.innerHTML = '';
+    const wrap = h('<div class="net-wrap"></div>');
+    if (d.rolledBack) wrap.append(h(`<div class="net-banner warn">${ICONS.refresh}<span>${esc(T('The last network change was rolled back automatically ({time}) because MrTerm could not reconnect.', { time: d.rolledBack }))}</span></div>`));
+    if (!d.editable) wrap.append(h(`<div class="net-banner">${ICONS.network}<span>${esc(d.note || T('Editing is supported for Ubuntu (netplan) and Debian/Proxmox (ifupdown). This host uses {backend}, so interfaces are shown read-only. Config files can still be edited.', { backend: d.backend }))}</span></div>`));
+
+    // System: Hostname, Gateway, DNS
+    const gw = d.routes.map((r) => `${esc(r.via || '—')} <span class="muted">(${esc(r.dev)})</span>`).join('<br>') || `<span class="muted">${T('none')}</span>`;
+    const sys = h(`<div class="net-sys">
+      <div><label>${T('Hostname')}</label><div class="v"><b>${esc(d.hostname)}</b><button class="btn ghost sm" data-s="host">${ICONS.edit}</button></div></div>
+      <div><label>${T('Default gateway')}</label><div class="v">${gw}</div></div>
+      <div><label>${T('DNS servers')}</label><div class="v">${esc(d.dns.servers.join(', ') || '—')}${d.dns.search.length ? `<br><span class="muted">${T('Search')}: ${esc(d.dns.search.join(' '))}</span>` : ''}${d.dns.editable && !d.dns.servers.includes('127.0.0.53') ? `<button class="btn ghost sm" data-s="dns">${ICONS.edit}</button>` : ''}</div>
+        ${d.dns.servers.includes('127.0.0.53') ? `<div class="hint">${T('systemd-resolved is used: set DNS servers per interface.')}</div>` : ''}</div></div>`);
+    sys.onclick = (e) => { const a = e.target.closest('[data-s]')?.dataset.s; if (a === 'host') this.hostname(); if (a === 'dns') this.resolv(); };
+    wrap.append(sys);
+
+    // Schnittstellen: live + nur konfigurierte
+    const live = d.interfaces.filter((i) => this.showVirtual || !VIRTUAL_IF.test(i.name));
+    const names = new Set(live.map((i) => i.name));
+    const cfgOnly = d.config.filter((c) => !d.interfaces.some((i) => i.name === c.name)).map((c) => ({ name: c.name, kind: c.kind, state: 'ABSENT', addrs: [], master: '' }));
+    const order = { bond: 1, bridge: 2, vlan: 3, ethernet: 0 };
+    const list = [...live, ...cfgOnly.filter((c) => !names.has(c.name))].sort((a, b) => ((order[this.kindOf(a)] ?? 4) - (order[this.kindOf(b)] ?? 4)) || a.name.localeCompare(b.name, undefined, { numeric: true }));
+    const grid = h('<div class="net-grid"></div>');
+    for (const i of list) grid.append(this.card(i));
+    wrap.append(grid);
+    this.body.append(wrap);
+    this.body.scrollTop = scroll;
+  }
+
+  kindOf(i) { return this.cfg(i.name)?.kind || (['bond', 'bridge', 'vlan'].includes(i.kind) ? i.kind : 'ethernet'); }
+
+  card(i) {
+    const c = this.cfg(i.name);
+    const kind = this.kindOf(i);
+    const up = i.state === 'UP' || i.state === 'UNKNOWN';
+    const summary = !c ? `<span class="muted">${T('Not configured')}</span>`
+      : c.method4 === 'dhcp' ? 'DHCP' : c.method4 === 'static' ? `${T('Static')} ${esc(c.addresses.join(', '))}${c.gateway ? ` → ${esc(c.gateway)}` : ''}` : `<span class="muted">${T('No IPv4')}</span>`;
+    const b = i.bonding;
+    const bondInfo = b ? `<div class="net-bond"><div><span class="muted">${T('Mode')}:</span> ${esc(b.mode || '')}${b.lacpRate ? ` · LACP ${esc(b.lacpRate)}` : ''}${b.hashPolicy ? ` · ${esc(b.hashPolicy)}` : ''}</div>
+      ${b.slaves.map((s) => `<div class="slave"><span class="dot ${s.mii === 'up' ? 'on' : 'err'}"></span>${esc(s.name)} <span class="muted">${esc(s.speed || '')}${s.aggregator ? ` · Agg ${esc(s.aggregator)}` : ''}</span></div>`).join('')}</div>` : '';
+    const el = h(`<div class="net-card ${i.state === 'ABSENT' ? 'absent' : ''}">
+      <div class="nh"><span class="dot ${i.state === 'ABSENT' ? '' : up ? 'on' : 'err'}"></span><b>${esc(i.name)}</b><span class="kind">${NET_KINDS[kind] || esc(i.kind || '')}</span>
+        ${i.master ? `<span class="muted">→ ${esc(i.master)}</span>` : ''}<span class="grow"></span>
+        ${this.data.editable ? `<button class="btn ghost sm" data-n="edit" title="${T('Edit')}">${ICONS.edit}</button>` : ''}
+        ${this.data.editable && c && kind !== 'ethernet' ? `<button class="btn ghost sm" data-n="del" title="${T('Delete')}">${ICONS.trash}</button>` : ''}</div>
+      <div class="nm muted">${i.mac ? esc(i.mac) : ''}${i.mtu ? ` · MTU ${i.mtu}` : ''}${i.state === 'ABSENT' ? T('Configured, but not present') : ''}</div>
+      <div class="na">${i.addrs.map((a) => `<div>${esc(a.addr)}${a.dynamic ? ' <span class="tag">DHCP</span>' : ''}</div>`).join('') || `<div class="muted">${T('No address')}</div>`}</div>
+      ${bondInfo}
+      <div class="ncfg"><span class="muted">${T('Configured')}:</span> ${summary}</div></div>`);
+    el.onclick = (e) => {
+      const a = e.target.closest('[data-n]')?.dataset.n;
+      if (a === 'edit') this.edit(i.name, kind);
+      if (a === 'del') this.remove(c);
+    };
+    return el;
+  }
+
+  // Anwenden mit Rollback-Anzeige
+  async run(label, fn) {
+    this.applying = true;
+    const ov = h(`<div class="overlay"><div class="spinner"></div><div class="msg">${esc(label)}</div><div class="msg" style="font-size:12px;color:var(--faint)">${T('MrTerm reconnects to confirm the change. Without confirmation the server restores the previous configuration after 90 seconds.')}</div></div>`);
+    this.el.append(ov);
+    try {
+      const r = await fn();
+      ov.remove();
+      if (r?.confirmed) { toast(r.direct ? T('Saved') : T('Network change applied and confirmed'), 'ok'); await this.refresh(); }
+      else {
+        setTabState(this, 'err');
+        this.body.innerHTML = `<div class="pane-empty"><div style="color:var(--orange);max-width:560px;text-align:center">${T('MrTerm could not reconnect after the change. The server restores the previous configuration automatically within 90 seconds.')}</div></div>`;
+        const b = h(`<button class="btn primary">${ICONS.refresh}${T('Reconnect')}</button>`);
+        b.onclick = () => { closeTab(this.id); openNetwork(this.host); };
+        $('.pane-empty', this.body).append(b);
+      }
+    } catch (e) { ov.remove(); toast(e.message, 'error'); }
+    this.applying = false;
+  }
+
+  async confirmApply(what) {
+    const r = await modal({ title: T('Apply network change?'), text: what,
+      body: `<p style="margin-top:0">${T('The change is applied immediately. If MrTerm cannot reconnect within 90 seconds, the server restores the previous configuration automatically.')}</p>
+        <div class="field"><label>${T('Reconnect via')}</label><input name="verify" value="${esc(this.host.address)}"/><div class="hint">${T('Change this if the change affects the address MrTerm uses to connect.')}</div></div>`,
+      buttons: [{ label: T('Cancel'), value: null, cls: 'ghost' }, { label: T('Apply'), value: 'form', cls: 'primary' }] });
+    return r ? (r.verify.trim() === this.host.address ? '' : r.verify.trim()) : null;
+  }
+
+  edit(name, kind) {
+    const d = this.data;
+    const isNew = !name;
+    const m = structuredClone(this.cfg(name) || { name: name || '', kind, method4: 'none', addresses: [], gateway: '', dns: [], search: [], mtu: '', method6: 'auto', addresses6: [], gateway6: '',
+      bond: kind === 'bond' ? { members: [], mode: '802.3ad', lacpRate: 'fast', hashPolicy: 'layer3+4', miimon: 100 } : undefined,
+      bridge: kind === 'bridge' ? { members: [], stp: false } : undefined, vlan: kind === 'vlan' ? { id: '', link: '' } : undefined });
+    if (!this.cfg(name) && name) { const live = d.interfaces.find((i) => i.name === name); if (live?.addrs.some((a) => a.dynamic)) m.method4 = 'dhcp'; }
+    const phys = [...new Set([...d.interfaces.filter((i) => !VIRTUAL_IF.test(i.name) && (i.kind === 'ethernet' || i.kind === 'bond' || i.kind === 'vlan')).map((i) => i.name), ...d.config.filter((c) => c.kind !== 'bridge').map((c) => c.name)])].filter((x) => x !== m.name).sort();
+    const memberBox = (sel, filter) => {
+      const box = h('<div class="vpn-hosts"></div>');
+      phys.filter(filter).forEach((x) => box.append(h(`<label class="check"><input type="checkbox" data-m="${esc(x)}" ${sel.includes(x) ? 'checked' : ''}/>${esc(x)}<span class="muted" style="margin-left:6px;font-size:11px">${esc(d.interfaces.find((i) => i.name === x)?.mac || '')}</span></label>`)));
+      if (!box.children.length) box.append(h(`<div class="hint">${T('No suitable interfaces found.')}</div>`));
+      return box;
+    };
+    const fields = [];
+    if (isNew) fields.push(field(T('Name'), 'name', kind === 'bond' ? 'bond0' : kind === 'bridge' ? (d.backend === 'ifupdown' ? 'vmbr1' : 'br0') : '', { placeholder: kind === 'vlan' ? 'eno1.100' : '', hint: kind === 'vlan' ? T('Usually <parent>.<VLAN ID>, e.g. eno1.100') : '' }));
+    let members = null;
+    if (m.kind === 'bond') {
+      members = memberBox(m.bond.members, (x) => this.kindOf({ name: x, kind: d.interfaces.find((i) => i.name === x)?.kind }) === 'ethernet');
+      fields.push(heading(T('Bond')), h(`<label class="flabel">${T('Members')}</label>`), members,
+        field(T('Mode'), 'bmode', m.bond.mode, { type: 'select', options: BOND_MODES }),
+        row(field(T('LACP rate'), 'lacp', m.bond.lacpRate || 'slow', { type: 'select', options: [['fast', 'fast (1 s)'], ['slow', 'slow (30 s)']] }),
+          field(T('Hash policy'), 'hash', m.bond.hashPolicy || 'layer2', { type: 'select', options: ['layer2', 'layer2+3', 'layer3+4', 'encap2+3', 'encap3+4'].map((x) => [x, x]) })),
+        field(T('MII monitoring (ms)'), 'miimon', m.bond.miimon ?? 100, { type: 'number' }));
+    }
+    if (m.kind === 'bridge') {
+      members = memberBox(m.bridge.members, () => true);
+      fields.push(heading(T('Bridge')), h(`<label class="flabel">${T('Ports')}</label>`), members, check(T('Spanning Tree (STP)'), 'stp', m.bridge.stp));
+    }
+    if (m.kind === 'vlan') fields.push(heading('VLAN'), row(field(T('VLAN ID'), 'vid', m.vlan.id, { type: 'number', placeholder: '100' }), field(T('Parent interface'), 'vlink', m.vlan.link, { type: 'select', options: [['', '—'], ...phys.map((x) => [x, x])] })));
+    const v4 = h('<div></div>');
+    v4.append(field(T('IPv4 addresses (one per line, CIDR)'), 'addresses', m.addresses.join('\n'), { type: 'textarea', placeholder: '192.168.1.10/24' }), field(T('Gateway'), 'gateway', m.gateway, { placeholder: '192.168.1.1' }));
+    const v6 = h('<div></div>');
+    v6.append(field(T('IPv6 addresses (one per line, CIDR)'), 'addresses6', m.addresses6.join('\n'), { type: 'textarea', placeholder: '2001:db8::10/64' }), field(T('IPv6 gateway'), 'gateway6', m.gateway6));
+    fields.push(heading('IPv4'), field(T('Method'), 'method4', m.method4, { type: 'select', options: [['dhcp', 'DHCP'], ['static', T('Static')], ['none', T('No IPv4 address')]] }), v4,
+      heading('DNS'), row(field(T('DNS servers'), 'dns', m.dns.join(', '), { placeholder: '1.1.1.1, 9.9.9.9' }), field(T('Search domains'), 'search', m.search.join(' '), { placeholder: 'example.lan' })),
+      heading('IPv6'), field(T('Method'), 'method6', m.method6, { type: 'select', options: [['auto', T('Automatic (SLAAC)')], ['dhcp', 'DHCPv6'], ['static', T('Static')], ['none', T('Disabled')]] }), v6,
+      heading(T('Advanced')), field('MTU', 'mtu', m.mtu, { type: 'number', placeholder: '1500' }));
+    const form = openDrawer(isNew ? T('New {kind}', { kind: NET_KINDS[kind] }) : `${NET_KINDS[m.kind]} ${m.name}`, fields, async () => {
+      const f = formValues(form);
+      const out = { ...m, name: isNew ? f.name.trim() : m.name, method4: f.method4, addresses: f.method4 === 'static' ? splitList(f.addresses) : [], gateway: f.method4 === 'static' ? f.gateway.trim() : '',
+        dns: splitList(f.dns), search: splitList(f.search), mtu: f.mtu, method6: f.method6, addresses6: f.method6 === 'static' ? splitList(f.addresses6) : [], gateway6: f.method6 === 'static' ? f.gateway6.trim() : '' };
+      const sel = members ? $$('[data-m]', members).filter((x) => x.checked).map((x) => x.dataset.m) : [];
+      if (m.kind === 'bond') { if (!sel.length) throw new Error(T('Select at least one member.')); out.bond = { members: sel, mode: f.bmode, lacpRate: f.bmode === '802.3ad' ? f.lacp : '', hashPolicy: f.hash, miimon: f.miimon }; }
+      if (m.kind === 'bridge') out.bridge = { members: sel, stp: f.stp };
+      if (m.kind === 'vlan') { out.vlan = { id: f.vid, link: f.vlink }; if (!f.vlink) throw new Error(T('Select the parent interface.')); }
+      if (isNew && d.config.some((c) => c.name === out.name)) throw new Error(T('An interface with this name already exists.'));
+      const verify = await this.confirmApply(`${NET_KINDS[out.kind]} ${out.name}`);
+      if (verify === null) return false;
+      closeDrawer();
+      this.run(T('Applying network configuration …'), () => api.call('network:save', this.id, out, verify));
+      return false;
+    });
+    const sync = () => {
+      v4.style.display = $('[name=method4]', form).value === 'static' ? '' : 'none';
+      v6.style.display = $('[name=method6]', form).value === 'static' ? '' : 'none';
+      const bm = $('[name=bmode]', form);
+      if (bm) $('[name=lacp]', form).closest('.field').style.display = bm.value === '802.3ad' ? '' : 'none';
+    };
+    form.addEventListener('change', sync);
+    sync();
+  }
+
+  async remove(c) {
+    if (!(await confirmBox(T('Delete {kind} {name}?', { kind: NET_KINDS[c.kind], name: c.name }), T('The interface is removed from the configuration. Members keep their current settings.')))) return;
+    const verify = await this.confirmApply(`${T('Delete')} ${c.name}`);
+    if (verify === null) return;
+    this.run(T('Applying network configuration …'), () => api.call('network:remove', this.id, c, verify));
+  }
+
+  async hostname() {
+    const n = await promptBox(T('Change hostname'), T('Hostname'), this.data.hostname);
+    if (!n || n === this.data.hostname) return;
+    try { await call('network:hostname', this.id, n.trim()); toast(T('Hostname changed'), 'ok'); this.refresh(); } catch {}
+  }
+
+  async resolv() {
+    const r = await modal({ title: T('DNS servers'), body: `<div class="field"><label>${T('DNS servers')}</label><input name="s" value="${esc(this.data.dns.servers.join(', '))}"/></div><div class="field"><label>${T('Search domains')}</label><input name="d" value="${esc(this.data.dns.search.join(' '))}"/></div><div class="hint">${T('Written to /etc/resolv.conf.')}</div>`,
+      buttons: [{ label: T('Cancel'), value: null, cls: 'ghost' }, { label: T('Save'), value: 'form', cls: 'primary' }] });
+    if (!r) return;
+    try { await call('network:resolv', this.id, splitList(r.s), splitList(r.d)); toast(T('Saved'), 'ok'); this.refresh(); } catch {}
+  }
+
+  async files() {
+    const list = [...new Set([...this.data.files, '/etc/hosts', ...(this.data.dns.editable ? ['/etc/resolv.conf'] : [])])];
+    const f = await new Promise((res) => ctxMenu(innerWidth - 320, 90, list.map((p) => ({ label: p, icon: 'file', run: () => res(p) }))));
+    let content;
+    try { content = await call('network:readFile', this.id, f); } catch { return; }
+    const net = !/^\/etc\/(hosts|resolv\.conf)$/.test(f);
+    const form = openDrawer(f, [field(T('Content'), 'content', content, { type: 'textarea', hint: net ? T('Saving applies the file with automatic rollback.') : '' })], async () => {
+      const v = formValues(form).content;
+      if (!net) { this.run(T('Saving …'), () => api.call('network:writeFile', this.id, f, v, '')); return; }
+      const verify = await this.confirmApply(f);
+      if (verify === null) return false;
+      closeDrawer();
+      this.run(T('Applying network configuration …'), () => api.call('network:writeFile', this.id, f, v, verify));
+      return false;
+    });
+    const ta = $('textarea', form); ta.classList.add('mono'); ta.style.minHeight = '60vh';
+  }
+
+  dispose() { this.unsub(); api.call('network:close', this.id).catch(() => {}); }
+}
+function openNetwork(host) { return new NetworkSession(host); }
+
 // ============================================================ Command Palette / Quick Connect
 function openPalette() {
   if ($('.palette')) return;
@@ -1465,6 +2253,9 @@ function openPalette() {
     hosts.slice(0, 12).forEach((x) => {
       items.push({ grp: 'Hosts', icon: avatar(x), label: x.label || x.address, sub: hostSub(x), run: () => connectHost(x) });
       if (x.protocol !== 'rdp' && q) items.push({ grp: 'Hosts', icon: `<div class="avatar" style="background:var(--icon-bg);color:var(--folder)">${ICONS.folder}</div>`, label: `SFTP: ${x.label || x.address}`, run: () => openSftp(x) });
+      if (x.protocol !== 'rdp' && q) items.push({ grp: 'Hosts', icon: `<div class="avatar" style="background:var(--icon-bg);color:var(--accent-2)">${ICONS.docker}</div>`, label: `Docker: ${x.label || x.address}`, run: () => openDocker(x) });
+      if (x.protocol !== 'rdp' && q) items.push({ grp: 'Hosts', icon: `<div class="avatar" style="background:var(--icon-bg);color:var(--orange)">${ICONS.wall}</div>`, label: `${T('Firewall')}: ${x.label || x.address}`, run: () => openFirewall(x) });
+      if (x.protocol !== 'rdp' && q) items.push({ grp: 'Hosts', icon: `<div class="avatar" style="background:var(--icon-bg);color:var(--accent)">${ICONS.network}</div>`, label: `${T('Network')}: ${x.label || x.address}`, run: () => openNetwork(x) });
     });
     S.vault.snippets.filter((s) => q && s.label.toLowerCase().includes(q)).slice(0, 5).forEach((s) => items.push({ grp: 'Snippets', icon: `<div class="avatar" style="background:var(--icon-bg);color:var(--green)">${ICONS.code}</div>`, label: s.label, sub: s.command, run: () => runSnippet(s) }));
     [[T('New host'), () => { activateTab('home'); editHost({}); }], [T('Generate key'), generateKey], [T('Settings'), () => $('[data-view=settings]').click()]]
@@ -1505,7 +2296,9 @@ if (api.platform === 'darwin') $('.win-ctrls').style.display = 'none';
 document.addEventListener('keydown', (e) => {
   if (!e.ctrlKey) return;
   const inTerm = !!e.target.closest?.('.xterm');
-  if ((e.code === 'KeyK' || e.code === 'KeyT') && (e.shiftKey || !inTerm)) { e.preventDefault(); openPalette(); }
+  if ($('.lock-screen')) return;
+  if (e.shiftKey && e.code === 'KeyL') { e.preventDefault(); lockNow(); }
+  else if ((e.code === 'KeyK' || e.code === 'KeyT') && (e.shiftKey || !inTerm)) { e.preventDefault(); openPalette(); }
   else if (e.shiftKey && e.code === 'KeyW') { e.preventDefault(); if (S.active !== 'home') closeTab(S.active); }
   else if (e.code === 'Tab') {
     e.preventDefault();
@@ -1530,8 +2323,9 @@ api.on('secret:request', async (req) => {
   api.replySecret(req.reqId, r ? r.v : null);
 });
 api.on('fw:event', () => reload());
+api.on('vpn:changed', async () => { S.vpnStatus = await call('vpn:status').catch(() => ({})); if (S.view === 'vpns' && S.active === 'home') render(); });
 api.on('toast', (m, t) => toast(m, t));
 api.on('win:state', (max) => { $('#winMax').innerHTML = max ? '<svg viewBox="0 0 12 12"><rect x="2" y="4" width="6" height="6"/><path d="M4 4V2h6v6H8"/></svg>' : '<svg viewBox="0 0 12 12"><rect x="2" y="2" width="8" height="8"/></svg>'; });
 
-reload();
+reload(); // zeigt bei aktiver Sperre zuerst den Sperrbildschirm
 $('#updateBadge').onclick = () => updateInfo && showUpdate(updateInfo);

src/renderer/index.html

@@ -18,6 +18,7 @@
       </div>
       <button id="newTabBtn" class="icon-btn" title="Quick Connect (Ctrl+Shift+K)" data-i18n-title="Quick Connect (Ctrl+Shift+K)">+</button>
       <div class="drag-fill"></div>
+      <button id="lockBtn" class="icon-btn lock-btn" style="display:none" title="Lock (Ctrl+Shift+L)" data-i18n-title="Lock (Ctrl+Shift+L)"><svg viewBox="0 0 24 24"><rect x="5" y="11" width="14" height="10" rx="2"/><path d="M8 11V7a4 4 0 0 1 8 0v4"/></svg></button>
       <div class="win-ctrls">
         <button id="winMin" title="Minimize" data-i18n-title="Minimize"><svg viewBox="0 0 12 12"><path d="M2 6h8"/></svg></button>
         <button id="winMax" title="Maximize" data-i18n-title="Maximize"><svg viewBox="0 0 12 12"><rect x="2" y="2" width="8" height="8"/></svg></button>
@@ -33,6 +34,7 @@
         <button class="nav" data-view="sftp"><svg viewBox="0 0 24 24"><path d="M3 7a2 2 0 0 1 2-2h4l2 2h8a2 2 0 0 1 2 2v8a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2z"/></svg><span>SFTP</span></button>
         <button class="nav" data-view="keys"><svg viewBox="0 0 24 24"><circle cx="8" cy="15" r="4"/><path d="M11 12l9-9M16 7l3 3M14 9l2 2"/></svg><span>Keychain</span></button>
         <button class="nav" data-view="forwards"><svg viewBox="0 0 24 24"><path d="M4 8h13l-3-3M20 16H7l3 3"/></svg><span>Port Forwarding</span></button>
+        <button class="nav" data-view="vpns"><svg viewBox="0 0 24 24"><path d="M12 3l8 3v6c0 5-3.5 8-8 9-4.5-1-8-4-8-9V6z"/><path d="M9 12h6M12 9v6"/></svg><span>VPN</span></button>
         <button class="nav" data-view="snippets"><svg viewBox="0 0 24 24"><path d="M8 7l-5 5 5 5M16 7l5 5-5 5"/></svg><span>Snippets</span></button>
         <button class="nav" data-view="known"><svg viewBox="0 0 24 24"><path d="M12 3l8 3v6c0 5-3.5 8-8 9-4.5-1-8-4-8-9V6z"/><path d="M9 12l2 2 4-4"/></svg><span>Known Hosts</span></button>
         <button class="nav" data-view="history"><svg viewBox="0 0 24 24"><circle cx="12" cy="12" r="9"/><path d="M12 7v5l3 2"/></svg><span data-i18n="History">History</span></button>

src/renderer/styles.css

@@ -238,6 +238,7 @@ body.in-session #sidebar { display: none; }
 .session .term { flex: 1; min-width: 0; min-height: 0; overflow: hidden; }
 /* Innenabstand am .xterm-Element: FitAddon zieht nur dessen Padding ab (am Elternelement würde es mitgezählt) */
 .session .term .xterm { height: 100%; padding: 8px 0 4px 10px; }
+.session .term .xterm-viewport { background-color: transparent !important; } /* sonst schwarzer Rand im Innenabstand */
 .session .overlay { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 16px; background: var(--overlay); z-index: 3; }
 .session .overlay .spinner { width: 36px; height: 36px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.9s linear infinite; }
 .session .overlay .msg { color: var(--muted); max-width: 520px; text-align: center; }
@@ -342,3 +343,89 @@ kbd { background: var(--card); border: 1px solid var(--border); border-bottom-wi
 #sidebar.nav-collapsed .nav-menu { flex-direction: row; flex-wrap: wrap; gap: 2px; }
 #sidebar.nav-collapsed .nav-menu .nav { padding: 7px; flex: 0 0 auto; }
 #sidebar.nav-collapsed .nav-menu .nav span { display: none; }
+
+/* App-Sperre */
+.lock-btn svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2; }
+.lock-screen { position: fixed; inset: 0; top: var(--titlebar); z-index: 200; background: var(--bg); display: flex; align-items: center; justify-content: center; animation: fade .15s; }
+.lock-box { width: 340px; display: flex; flex-direction: column; align-items: center; gap: 14px; text-align: center; }
+.lock-box h2 { margin: 0 0 6px; font-size: 18px; }
+.lock-logo { width: 64px; height: 64px; }
+.lock-pw { display: flex; gap: 8px; width: 100%; }
+.lock-pw input { flex: 1; min-width: 0; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 9px 11px; color: var(--text); outline: none; }
+.lock-pw input:focus { border-color: var(--accent); }
+.lock-fido { width: 100%; justify-content: center; }
+.lock-err { color: var(--red); min-height: 18px; font-size: 13px; }
+.lock-row { display: flex; align-items: center; gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--border); }
+.lock-row .grow { flex: 1; min-width: 0; }
+.lock-row b { display: flex; align-items: center; gap: 6px; }
+.lock-row b svg { width: 14px; height: 14px; }
+.lock-row .sub { color: var(--muted); font-size: 12px; margin-top: 2px; }
+
+/* VPN */
+.vpn-hosts { display: flex; flex-direction: column; gap: 2px; max-height: 260px; overflow: auto; }
+.spinner.sm { display: inline-block; width: 12px; height: 12px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .9s linear infinite; margin-right: 6px; vertical-align: -2px; }
+
+/* Docker */
+.session.docker .sbar .search.sm { flex: 0 1 260px; height: 28px; margin: 0; }
+.session.docker .rt { color: var(--faint); }
+.docker-body { flex: 1; overflow: auto; position: relative; }
+.docker-body .pane-empty { height: 100%; display: flex; flex-direction: column; gap: 14px; align-items: center; justify-content: center; }
+.docker-table { width: 100%; border-collapse: collapse; }
+.docker-table th { position: sticky; top: 0; background: var(--bg); text-align: left; font-size: 11px; color: var(--faint); font-weight: 600; padding: 8px 10px; text-transform: uppercase; letter-spacing: .4px; border-bottom: 1px solid var(--border); z-index: 1; }
+.docker-table td { padding: 7px 10px; border-bottom: 1px solid var(--row-line); white-space: nowrap; vertical-align: middle; }
+.docker-table tr:hover td { background: rgb(var(--tint) / 0.024); }
+.docker-table td.name { width: 30%; max-width: 0; }
+.docker-table td.name > div { display: flex; flex-direction: column; min-width: 0; }
+.docker-table td.name b, .docker-table td.name .img { overflow: hidden; text-overflow: ellipsis; }
+.docker-table td.name .img { color: var(--faint); font-size: 11px; }
+.docker-table td.muted { color: var(--muted); font-size: 12px; }
+.docker-table td.ports { max-width: 260px; overflow: hidden; text-overflow: ellipsis; }
+.docker-table .num { text-align: right; font-variant-numeric: tabular-nums; color: var(--muted); }
+.docker-table td.acts { text-align: right; }
+.docker-table td.acts .btn { padding: 4px 6px; }
+.docker-table .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--faint); }
+.docker-table .dot.on { background: var(--green); }
+.docker-table .dot.wait { background: var(--orange); }
+
+/* Firewall */
+.seg.sm button { padding: 4px 10px; font-size: 12px; }
+.fw-head { display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
+.fw-def { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 12px; margin-left: 8px; }
+.fw-def select { background: var(--panel); border: 1px solid var(--border); border-radius: 6px; padding: 4px 8px; color: var(--text); }
+.fw-note { padding: 10px 16px; color: var(--faint); font-size: 12px; border-bottom: 1px solid var(--border); }
+.fw-chain-head { display: flex; align-items: center; gap: 10px; padding: 14px 16px 8px; }
+.fw-chain-head .muted { color: var(--faint); font-size: 12px; }
+.fw-chain-head .fw-def { margin-left: auto; }
+.fw-table td.spec { font-size: 12px; white-space: normal; word-break: break-all; }
+.fw-act { font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 10px; background: rgb(var(--tint) / 0.063); color: var(--muted); }
+.fw-act.allow, .fw-act.accept { background: color-mix(in srgb, var(--green) 14%, transparent); color: var(--green); }
+.fw-act.deny, .fw-act.reject { background: color-mix(in srgb, var(--red) 14%, transparent); color: var(--red); }
+.fw-act.limit { background: color-mix(in srgb, var(--orange) 14%, transparent); color: var(--orange); }
+.fw-table th:first-child, .fw-table td:first-child { width: 44px; text-align: left; padding-left: 16px; }
+.fw-off { display: flex; flex-direction: column; align-items: center; gap: 6px; color: var(--muted); text-align: center; }
+.fw-off svg { width: 40px; height: 40px; color: var(--faint); margin-bottom: 6px; }
+.fw-off b { color: var(--text); font-size: 15px; }
+
+/* Netzwerk */
+.net-wrap { padding: 16px; display: flex; flex-direction: column; gap: 14px; }
+.net-banner { display: flex; gap: 10px; align-items: center; padding: 10px 14px; border-radius: 10px; background: var(--panel); border: 1px solid var(--border); color: var(--muted); font-size: 13px; }
+.net-banner.warn { border-color: color-mix(in srgb, var(--orange) 50%, transparent); color: var(--orange); }
+.net-sys { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; background: var(--card); border-radius: 12px; padding: 14px 16px; }
+.net-sys label { font-size: 11px; text-transform: uppercase; letter-spacing: .4px; color: var(--faint); font-weight: 600; }
+.net-sys .v { margin-top: 4px; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
+.net-sys .hint { font-size: 11px; color: var(--faint); margin-top: 4px; }
+.net-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 12px; align-items: start; }
+.net-card { background: var(--card); border-radius: 12px; padding: 12px 14px; display: flex; flex-direction: column; gap: 6px; }
+.net-card.absent { opacity: .7; border: 1px dashed var(--border); }
+.net-card .nh { display: flex; align-items: center; gap: 8px; }
+.net-card .nh .grow { flex: 1; }
+.net-card .kind { font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: .4px; padding: 2px 6px; border-radius: 6px; background: rgb(var(--tint) / 0.063); color: var(--muted); }
+.net-card .nm, .net-card .ncfg { font-size: 12px; }
+.net-card .na { font-family: var(--mono, monospace); font-size: 12.5px; display: flex; flex-direction: column; gap: 2px; }
+.net-card .net-bond { font-size: 12px; border-top: 1px solid var(--row-line); padding-top: 6px; display: flex; flex-direction: column; gap: 3px; }
+.net-card .slave { display: flex; align-items: center; gap: 6px; }
+.net-card .muted, .net-sys .muted { color: var(--faint); }
+.network .dot, .net-card .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--faint); flex: none; }
+.net-card .dot.on { background: var(--green); }
+.net-card .dot.err { background: var(--red); }
+.flabel { display: block; font-size: 11px; text-transform: uppercase; letter-spacing: .4px; color: var(--muted); font-weight: 600; margin: 4px 0 6px; }