# 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": "server-host-hardening",
    "name": "Host Hardening",
    "source": "tencent",
    "type": "skill",
    "category": "安全合规",
    "sourceUrl": "https://clawhub.ai/ppiankov/server-host-hardening",
    "canonicalUrl": "https://clawhub.ai/ppiankov/server-host-hardening",
    "targetPlatform": "OpenClaw"
  },
  "install": {
    "downloadUrl": "/downloads/server-host-hardening",
    "sourceDownloadUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=server-host-hardening",
    "sourcePlatform": "tencent",
    "targetPlatform": "OpenClaw",
    "packageFormat": "ZIP package",
    "primaryDoc": "SKILL.md",
    "includedAssets": [
      "SKILL.md"
    ],
    "downloadMode": "redirect",
    "sourceHealth": {
      "source": "tencent",
      "slug": "server-host-hardening",
      "status": "healthy",
      "reason": "direct_download_ok",
      "recommendedAction": "download",
      "checkedAt": "2026-04-29T07:13:48.064Z",
      "expiresAt": "2026-05-06T07:13:48.064Z",
      "httpStatus": 200,
      "finalUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=server-host-hardening",
      "contentType": "application/zip",
      "probeMethod": "head",
      "details": {
        "probeUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=server-host-hardening",
        "contentDisposition": "attachment; filename=\"server-host-hardening-1.0.0.zip\"",
        "redirectLocation": null,
        "bodySnippet": null,
        "slug": "server-host-hardening"
      },
      "scope": "item",
      "summary": "Item download looks usable.",
      "detail": "Yavira can redirect you to the upstream package for this item.",
      "primaryActionLabel": "Download for OpenClaw",
      "primaryActionHref": "/downloads/server-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/server-host-hardening",
    "downloadUrl": "https://openagent3.xyz/downloads/server-host-hardening",
    "agentUrl": "https://openagent3.xyz/skills/server-host-hardening/agent",
    "manifestUrl": "https://openagent3.xyz/skills/server-host-hardening/agent.json",
    "briefUrl": "https://openagent3.xyz/skills/server-host-hardening/agent.md"
  }
}
```
## Documentation

### Host Hardening

Secure a Linux server running OpenClaw in under 2 minutes.

### SSH — Key-Only Auth

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

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

Auto-restart on reboot:

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 you have key-based SSH access before disabling password auth
## Trust
- Source: tencent
- Verification: Indexed source record
- Publisher: ppiankov
- Version: 1.0.0
## Source health
- Status: healthy
- Item download looks usable.
- Yavira can redirect you to the upstream package for this item.
- Health scope: item
- Reason: direct_download_ok
- Checked at: 2026-04-29T07:13:48.064Z
- Expires at: 2026-05-06T07:13:48.064Z
- Recommended action: Download for OpenClaw
## Links
- [Detail page](https://openagent3.xyz/skills/server-host-hardening)
- [Send to Agent page](https://openagent3.xyz/skills/server-host-hardening/agent)
- [JSON manifest](https://openagent3.xyz/skills/server-host-hardening/agent.json)
- [Markdown brief](https://openagent3.xyz/skills/server-host-hardening/agent.md)
- [Download page](https://openagent3.xyz/downloads/server-host-hardening)