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One Circle Solutions

Resources · Scripts & Tools

Free tooling from our bench

The same baselines and templates we use in engagements, free to download and use. Every file lists its SHA-256 checksum — verify before you run, exactly as you'd expect a security firm to tell you.

Hardening

Windows 11 Hardening Script

Applies a conservative CIS-subset baseline to standalone Windows 11 machines: UAC, SmartScreen, SMB signing, LSA protection, Defender ASR rules, PowerShell logging, and audit policy. Includes a -ReportOnly audit mode and creates a restore point before changing anything.

Format
PowerShell
Size
12 KB
Version
1.0.0
Updated
2026-07-18
Requires
Windows 11, elevated PowerShell

SHA-256

9f8fc8afb7c314bf3e54369c7d9be3206097dc99b8e578e87936344baa8ec810
Download OneCircle-Win11-Hardening.ps1
Hardening

Linux Server Hardening Script

Baseline hardening for Debian/Ubuntu servers: SSH daemon lockdown, UFW default-deny firewall, kernel and network sysctls, auditd with starter rules, and unattended security updates. Includes a --report-only audit mode and validates the SSH config before reloading.

Format
Bash
Size
7 KB
Version
1.0.0
Updated
2026-07-18
Requires
Debian/Ubuntu, root

SHA-256

d57d78d9e565f724e47c8fe922b2b644667d196f26a925203fcfcae1f97e556d
Download onecircle-linux-hardening.sh

These tools apply conservative defaults, but every environment is different — read the script, run report-only mode first, and test before production. Want a reviewed, managed rollout instead? Talk to us.

Looking for guides and checklists instead? Back to all resources.

Want a reviewed, managed rollout instead of DIY?

These scripts apply conservative defaults, but every environment is different. We can assess, tailor, and operate hardening across your fleet — talk to us.