---
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---
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# 1. CISS.debian.installer

**Centurion Intelligence Consulting Agency Information Security Standard**<br>
*The CISS Debian Installer provides a fully automated and hardened installation process.*<br>
**Master Version**: 8.00<br>
**Build**: V8.00.000.2025.06.17<br>

This is a digitally signed, self-verifying shell script for installing a hardened Debian Bookworm server environment, based on 
the latest server and service hardening best practices. Compared to the original Debian installer, this installer offers much 
greater flexibility in terms of custom partitioning schemes and is more reliable than the Calamares suite.<br>

Check out more:
* [CenturionNet Services](https://coresecret.eu/cnet/)
* [CenturionDNS Resolver](https://eddns.eu/)
* [CenturionDNS Blocklist](https://dns.eddns.eu/blocklists/centurion_titanium_ultimate.txt)
* [CenturionNet Status](https://uptime.coresecret.eu/)
* [CenturionMeet](https://talk.e2ee.li/)
* [Contact the author](https://coresecret.eu/contact/)

## 1.1. Preliminary Remarks

### 1.1.1. HSM
Please note that all my signing keys are stored in an HSM and that the signing environment is air-gapped. The next step is to
move to a room-gapped environment. ^^

### 1.1.2. DNSSEC, HSTS, TLS

Please note that `coresecret.dev` is included in the [(HSTS Preload List)](https://hstspreload.org/) and always serves the headers:
````nginx configuration pro
add_header Expect-CT                 "max-age=86400, enforce"                       always;
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
````

* Additionally, the entire zone is dual-signed with **DNSSEC**. See the current **DNSSEC** status at: **[DNSSEC Audit Report](/docs/AUDIT_DNSSEC.md)**
* A comprehensive TLS audit of the **`git.coresecret.dev`** Gitea server is also available. See: **[TLS Audit Report](/docs/AUDIT_TLS.md)**
* The infrastructure of the **`CISS.debian.installer`** building system is visualized here. See: **[Centurion Net](/docs/CNET.md)**

### 1.1.3. Gitea Action Runner Hardening

The CI runners operate on a dedicated host system located in a completely separate Autonomous System (AS). This host is solely
dedicated to providing CI runners and does not perform any other tasks. Each runner is hermetically isolated from others using
non-privileged, shell-less user accounts with no direct login capability. Additionally, each runner executes within its own
separate directory tree, employs `DynamicUser` features, and adheres to strict systemd hardening policies
(achieving a ``systemd-analyze security``rating of **``2.6``**). Docker containers used by runners do not run in privileged 
mode. Security is further enhanced through the use of both UFW software firewalls and dedicated hardware firewall appliances.

### 1.2. Keywords

The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", 
"MAY", and "OPTIONAL" in this document are to be interpreted as described in [[BCP 14](https://www.rfc-editor.org/info/bcp14)], 
[[RFC2119](https://datatracker.ietf.org/doc/html/rfc2119)], [[RFC8174](https://datatracker.ietf.org/doc/html/rfc8174)] when, 
and only when, they appear in all capitals, as shown here.

# 6. Licensing & Compliance

This repository is fully SPDX-compliant. All source files include appropriate SPDX license identifiers and headers to ensure
clear and unambiguous licensing. You can verify compliance by reviewing the top of each file, which follows the SPDX
standard for license expressions and metadata.

# 7. Disclaimer

This README is provided "as-is" without any warranty. Review your organization's policies before deploying to production.

---
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