Air-Gapped Deployment

This chapter covers deploying Vouch in environments with no internet connectivity, such as defense contractors, government agencies, financial services, and critical infrastructure.

Status: Planned – This document describes the air-gapped deployment architecture for Vouch. Server and CLI packages are available from packages.vouch.sh, and the core components (SSH CA, FIDO2 authentication) exist today. However, air-gap-specific CLI commands (e.g., vouch enroll --airgap) and automation scripts are not yet implemented.

Overview

In an air-gapped environment:

• No SaaS services available
• Updates delivered via sneakernet
• Internal identity provider (no Google Workspace)
• Time sync from isolated NTP or GPS

Vouch’s built-in SSH CA and local-first architecture make it well-suited for these constraints.

Architecture

+--------------------------------------------------------------------------+
|                          AIR-GAPPED ENCLAVE                              |
|                                                                          |
|  +--------------------------------------------------------------------+  |
|  |                     On-Premises Vouch Stack                        |  |
|  |                                                                    |  |
|  |  +--------------+  +----------------+  +-----------------------+   |  |
|  |  |   Vouch      |  |   Built-in     |  |       SQLite          |   |  |
|  |  |   Server     |  |   SSH CA       |  |                       |   |  |
|  |  |              |  |                |  |  * Users & credentials |   |  |
|  |  |  * WebAuthn  |  |  * Ed25519 CA  |  |  * Sessions           |   |  |
|  |  |  * OIDC      |  |  * SSH certs   |  |  * Audit logs         |   |  |
|  |  |  * Sessions  |  |  * 8hr TTL     |  |                       |   |  |
|  |  +--------------+  +----------------+  +-----------------------+   |  |
|  |         |                  |                      |                |  |
|  |         +------------------+----------------------+                |  |
|  |                            |                                       |  |
|  +----------------------------+---------------------------------------+  |
|                               |                                          |
|                               | Internal Network Only                    |
|                               v                                          |
|  +--------------------------------------------------------------------+  |
|  |                        Workstations                                |  |
|  |                                                                    |  |
|  |  +--------------+  +--------------+  +-------------------------+   |  |
|  |  | Workstation  |  | Workstation  |  |   Protected Resources   |   |  |
|  |  |              |  |              |  |                         |   |  |
|  |  | * vouch CLI  |  | * vouch CLI  |  |  * SSH servers          |   |  |
|  |  | * YubiKey    |  | * YubiKey    |  |  * Internal apps        |   |  |
|  |  | * Certs      |  | * Certs      |  |  * Databases            |   |  |
|  |  +--------------+  +--------------+  +-------------------------+   |  |
|  |                                                                    |  |
|  +--------------------------------------------------------------------+  |
|                                                                          |
|  +--------------------------------------------------------------------+  |
|  |                       Time Infrastructure                          |  |
|  |  +------------+     +-----------------+                            |  |
|  |  | GPS Time   |---->|  Internal NTP   |----> All hosts             |  |
|  |  | Receiver   |     |  (stratum 1)    |                            |  |
|  |  +------------+     +-----------------+                            |  |
|  +--------------------------------------------------------------------+  |
+--------------------------------------------------------------------------+
                                    |
                                    | Air Gap (sneakernet)
                                    v
+--------------------------------------------------------------------------+
|                         CONNECTED ENVIRONMENT                            |
|                                                                          |
|  * Signed software packages (from packages.vouch.sh)                     |
|  * CA certificate updates                                                |
|  * (Optional) Audit log export                                           |
+--------------------------------------------------------------------------+

Identity Provider Considerations

In an air-gapped environment, you cannot use external identity providers like Google Workspace for enrollment. Vouch Server requires at least one upstream IdP to verify user identity, so an air-gapped deployment must include a self-hosted IdP inside the enclave:

• Self-hosted OIDC provider — Deploy an internal OIDC-compliant IdP inside the enclave (e.g., Keycloak, Dex, or Microsoft AD FS). Add it to Vouch Server’s VOUCH_IDPS list with VOUCH_IDP_<SLUG>_TYPE=oidc plus the _ISSUER, _CLIENT_ID, and _CLIENT_SECRET variables pointing to the internal IdP.
• Self-hosted SAML provider — Deploy an internal SAML IdP (e.g., Shibboleth, AD FS) and configure it with VOUCH_IDP_<SLUG>_TYPE=saml plus VOUCH_IDP_<SLUG>_METADATA_URL pointing to the internal metadata document.

Prerequisites

Hardware

• Servers for Vouch stack (VMs or bare metal)
• YubiKey 5 series for each user (firmware 5.2+)
• GPS receiver for time sync (recommended)
• USB drives for sneakernet transfers

Software (Pre-downloaded)

• Vouch Server packages (RPM/DEB from packages.vouch.sh)
• vouch CLI packages (RPM/DEB from packages.vouch.sh)
• Container images and/or Helm charts (for Kubernetes deployments)