# Send Host Hardening to your agent Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually. ## Fast path - Download the package from Yavira. - Extract it into a folder your agent can access. - Paste one of the prompts below and point your agent at the extracted folder. ## Suggested prompts ### New install ```text I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Tell me what you changed and call out any manual steps you could not complete. ``` ### Upgrade existing ```text I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Summarize what changed and any follow-up checks I should run. ``` ## Machine-readable fields ```json { "schemaVersion": "1.0", "item": { "slug": "host-hardening", "name": "Host Hardening", "source": "tencent", "type": "skill", "category": "安全合规", "sourceUrl": "https://clawhub.ai/ppiankov/host-hardening", "canonicalUrl": "https://clawhub.ai/ppiankov/host-hardening", "targetPlatform": "OpenClaw" }, "install": { "downloadUrl": "/downloads/host-hardening", "sourceDownloadUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=host-hardening", "sourcePlatform": "tencent", "targetPlatform": "OpenClaw", "packageFormat": "ZIP package", "primaryDoc": "SKILL.md", "includedAssets": [ "SKILL.md" ], "downloadMode": "redirect", "sourceHealth": { "source": "tencent", "status": "healthy", "reason": "direct_download_ok", "recommendedAction": "download", "checkedAt": "2026-04-30T16:55:25.780Z", "expiresAt": "2026-05-07T16:55:25.780Z", "httpStatus": 200, "finalUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=network", "contentType": "application/zip", "probeMethod": "head", "details": { "probeUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=network", "contentDisposition": "attachment; filename=\"network-1.0.0.zip\"", "redirectLocation": null, "bodySnippet": null }, "scope": "source", "summary": "Source download looks usable.", "detail": "Yavira can redirect you to the upstream package for this source.", "primaryActionLabel": "Download for OpenClaw", "primaryActionHref": "/downloads/host-hardening" }, "validation": { "installChecklist": [ "Use the Yavira download entry.", "Review SKILL.md after the package is downloaded.", "Confirm the extracted package contains the expected setup assets." ], "postInstallChecks": [ "Confirm the extracted package includes the expected docs or setup files.", "Validate the skill or prompts are available in your target agent workspace.", "Capture any manual follow-up steps the agent could not complete." ] } }, "links": { "detailUrl": "https://openagent3.xyz/skills/host-hardening", "downloadUrl": "https://openagent3.xyz/downloads/host-hardening", "agentUrl": "https://openagent3.xyz/skills/host-hardening/agent", "manifestUrl": "https://openagent3.xyz/skills/host-hardening/agent.json", "briefUrl": "https://openagent3.xyz/skills/host-hardening/agent.md" } } ``` ## Documentation ### Host Hardening Secure a Linux server running OpenClaw. ### Requirements OS: Linux (Ubuntu/Debian — adjust package commands for other distros) Privileges: Root or sudo required — this skill modifies system-wide security config Pre-check: Verify you have SSH key-based access before disabling password auth ⚠️ All commands below modify system configuration. Confirm with the user before running each section. Do not run these automatically without explicit approval. ### SSH — Key-Only Auth Disables password authentication. Ensure key-based SSH works first or you will be locked out. sed -i 's/^#*PermitRootLogin.*/PermitRootLogin prohibit-password/' /etc/ssh/sshd_config sed -i 's/^#*PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config systemctl restart ssh ### Firewall — Deny All Except SSH ufw default deny incoming ufw default allow outgoing ufw allow ssh yes | ufw enable Add more rules as needed (e.g. ufw allow 443 for HTTPS). ### Fail2ban — Brute-Force Protection Installs fail2ban via apt (Debian/Ubuntu). Adjust for other package managers. apt-get install -y fail2ban systemctl enable --now fail2ban Default config protects SSH. For custom jails: /etc/fail2ban/jail.local. ### OpenClaw Credentials chmod 700 ~/.openclaw/credentials ### OpenClaw Gateway Service (optional) Creates a systemd service for auto-restart on reboot. Runs as root — review the service file before enabling. cat > /etc/systemd/system/openclaw-gateway.service << 'EOF' [Unit] Description=OpenClaw Gateway After=network-online.target Wants=network-online.target [Service] Type=simple ExecStart=/usr/bin/env openclaw gateway Restart=always RestartSec=5 User=root WorkingDirectory=/root/.openclaw Environment=HOME=/root [Install] WantedBy=multi-user.target EOF systemctl daemon-reload && systemctl enable openclaw-gateway ### Verify ufw status # active, SSH allowed systemctl is-active fail2ban # active grep PasswordAuthentication /etc/ssh/sshd_config # no stat -c %a ~/.openclaw/credentials # 700 systemctl is-enabled openclaw-gateway # enabled ### Lessons On Ubuntu, SSH service is ssh not sshd AWS security groups provide network-level filtering but UFW is defense-in-depth Always verify key-based SSH access before disabling password auth The gateway service is optional — only needed if OpenClaw should survive reboots Host Hardening v1.0 Author: ppiankov Copyright © 2026 ppiankov Canonical source: https://clawhub.com/skills/host-hardening License: MIT If this document appears elsewhere, the link above is the authoritative version. ## Trust - Source: tencent - Verification: Indexed source record - Publisher: ppiankov - Version: 1.0.4 ## Source health - Status: healthy - Source download looks usable. - Yavira can redirect you to the upstream package for this source. - Health scope: source - Reason: direct_download_ok - Checked at: 2026-04-30T16:55:25.780Z - Expires at: 2026-05-07T16:55:25.780Z - Recommended action: Download for OpenClaw ## Links - [Detail page](https://openagent3.xyz/skills/host-hardening) - [Send to Agent page](https://openagent3.xyz/skills/host-hardening/agent) - [JSON manifest](https://openagent3.xyz/skills/host-hardening/agent.json) - [Markdown brief](https://openagent3.xyz/skills/host-hardening/agent.md) - [Download page](https://openagent3.xyz/downloads/host-hardening)