Borrowing it
Nothing to install: this file belongs to Sergei-thinker/vpn-setup. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Sergei-thinker/vpn-setup/master/.claude/skills/vpn-security-check/SKILL.mdgit clone --depth 1 https://github.com/Sergei-thinker/vpn-setupWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/sergei-thinker/vpn-setup/vpn-security-check)<a href="https://agentmods.dev/skills/sergei-thinker/vpn-setup/vpn-security-check"><img src="https://agentmods.dev/badge/skills/sergei-thinker/vpn-setup/vpn-security-check/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/sergei-thinker/vpn-setup/vpn-security-check"><img src="https://agentmods.dev/badge/skills/sergei-thinker/vpn-setup/vpn-security-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00043 | $0.01707 |
| Opus 5 | $0.00022 | $0.00853 |
| Sonnet 5 | $0.00009 | $0.00341 |
| Haiku 4.5 | $0.00004 | $0.00171 |
Grade A, and why
vpn-security-check scanned grade A with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Asks for rootlowPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
| World-readable (644, 755, etc.) | WARN — `python ssh_exec.py exec "chmod 600 /root/vpn-credentials.txt"` | Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
Command: `python ssh_exec.py exec "curl -s -o /dev/null -w '%{http_code}' http://localhost:80"` How it starts
The opening of the file, as written. The whole thing — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
VPN Infrastructure Security Audit
Checks that the VPN server is properly hardened. All checks run via ssh_exec.py — no additional tools needed.
When to Use
- User asks about security: "check security", "is my VPN safe"
- After initial deployment (offer proactively)
- User has security concerns
- Periodic security checkup
The Iron Law
EVERY CHECK MUST RUN A COMMAND. NO ASSUMPTIONS.
"quick-rebuild.sh enables the firewall" is not evidence that the firewall is active. Run the check.
Security Checks
Run ALL checks in order. Report each as PASS/FAIL/WARN with evidence.
1. SSH Hardening
1a. SSH Port
Command: python ssh_exec.py exec "grep -E '^Port ' /etc/ssh/sshd_config"
| Result | Rating |
|---|---|
| Port != 22 (e.g., 49152) | PASS |
| Port 22 | FAIL — TSPU scans and blocks port 22 to foreign IPs. Change with: python ssh_exec.py exec "sed -i 's/^Port 22/Port 49152/' /etc/ssh/sshd_config && systemctl restart sshd" |
1b. Root Password Login
Command: python ssh_exec.py exec "grep -E '^PasswordAuthentication' /etc/ssh/sshd_config"
| Result | Rating |
|---|---|
| PasswordAuthentication no | PASS |
| PasswordAuthentication yes | WARN — Key-only auth is more secure. Note: some beginners use password auth intentionally. Inform, don't force change |
| Not set (commented out) | WARN — defaults to yes on most distros |
2. Firewall
2a. UFW Status
Command: python ssh_exec.py exec "ufw status verbose"
| Result | Rating |
|---|---|
| Status: active, rules for 443/8443/2053/SSH port | PASS |
| Status: inactive | FAIL — python ssh_exec.py exec "ufw --force enable" |
| Active but missing expected ports | WARN — check if needed ports are open |
2b. Open Ports (reality check)
Command: python ssh_exec.py exec "ss -tnlp | grep -E 'LISTEN' | awk '{print \$4, \$6}'"
Verify only expected services are listening:
- xray on 443, 8443, 2053 (VPN)
- x-ui panel (some high port)
- sshd on configured port
- nginx on 80 (camouflage)
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 196 lines · 43 tokens per session scan A 086b39429da0
vpn-security-check is a skill published in the GitHub repository Sergei-thinker/vpn-setup (184 stars, last pushed 4mo ago), licensed MIT. It adds 43 tokens to every session and 1,707 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 2 findings (asks for root, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
Xrayebator: your own VPN on a VPS (Xray Reality)
Use when the user needs their own VPN/proxy on a VPS to bypass regional blocks or DPI so research APIs and browsers work through a clean exit. One-script Xray VLESS+REALITY installer and client manager.
identity-work
A guided reflection skill for recognising when personal labels or fixed positions are distorting judgement, then using a new self-image to support behaviour change.
mpstats-connector
A connector for MPStats, a paid analytics service for Ozon and Wildberries marketplace products. It reports sales, prices, stock, warehouses, and seller or brand details for specific items.
citilink-connector
A connector for searching Citilink and reading individual electronics product cards. Citilink is an electronics retailer, and the connector reads its rendered pages through an operator-controlled Chrome browser.
compare-prices
Use this skill when the operator asks where something is cheapest across marketplaces. Fans out to ten searchable sources — Wildberries, Ozon, Yandex Market, Avito, Taobao, Megamarket, Lamoda, DNS, Citilink and AliExpress (Detsky Mir is excluded — no text search; Taobao is ranked in yuan, never against rubles).…
aliexpress-connector
Use this skill when the operator asks to search AliExpress or read one of its product cards. Two tools, aliexpresssearch and aliexpresscard; prices in rubles; rating and order counts included, review TEXTS intentionally not exposed. CDP-only: without the scraping-profile Chrome this source answers nothing. Trigger on…