PortGuard: Keep Your Services Invisible to Scanners
PortGuard combines a modified fwknop-based server with a cross-platform client that supports the fwknop SPA protocol. Ports stay closed by default and open temporarily only after a valid AES/GPG-signed packet is verified.
Quick Server Install
Installs the latest open-source package built by GitHub Actions from the PortGuard server repository.
curl -fsSL https://portguard.net/install.sh | sudo bash
Traditional Exposure Mode (Risk)
- ✕Ports remain open all day and are continuously probed by global scanners.
- ✕Exposed services face brute-force attempts and exploit attacks directly.
- ✕Firewall allowlists become complex to maintain and lack dynamic flexibility.
PortGuard Mode (Solution)
- ✓Default Deny: Ports are completely invisible before authorization (stealth).
- ✓SPA Auth: Only specially formatted encrypted single packets can trigger access.
- ✓Dynamic Access: Temporarily allow only the source IP, then close automatically.
Core Features
Core Security Features
Strong defaults for teams that want SSH, admin panels, and private services to disappear until authorization is intentional.
Efficient SPA Communication
Send fwknop-compatible single-packet authorization without TCP handshake overhead, with strong stealth.
AES/GPG + HMAC
Integrated SHA256 integrity checks ensure commands are authentic and untampered.
Full Port Stealth
Default DROP behavior makes services appear unreachable to scanners.
Replay Attack Resistance
Time-window validation plus integrity checks quickly invalidates old packets.
מדריך פורטגארד
A cleaner fwknop-compatible client for every device.
PortGuard Client supports the fwknop SPA protocol. Profiles, one-tap SPA, QR import, encrypted export, and activation stay compatible with fwknopd and PortGuard Server workflows.
How It Works
Security Workflow
PortGuard runs at the firewall edge of protected servers. It continuously inspects network traffic for authorization packets without exposing service handshakes externally.
Generate Authorization Packet
The client uses keys and a timestamp to generate an encrypted single packet.
Handshake-less Delivery
The packet is sent via UDP and similar methods, making handshake-based probing ineffective.
Dynamic Open
After validation, the server temporarily allows the source IP and then automatically removes the rule.
Use Cases
SSH Remote Operations
Protect port 22 and make it visible only briefly after an admin sends SPA.
Multi-Cloud Security
Unified access control across AWS/Azure and more to reduce exposure.
IoT Device Management
Protect IoT control interfaces and avoid direct public exposure.
ACL Automation
Combine scripts and rule cycles to automate temporary authorization.
Downloads and Installation
Supports multi-platform clients and server-side packages
Server Packages
Install PortGuard Server on Debian, Ubuntu, Rocky, CentOS, and OpenWrt
Use the quick installer for supported Linux servers, or download the latest package generated from the open-source GitHub Actions release pipeline.
Quick Install
One command server setup
curl -fsSL https://portguard.net/install.sh | sudo bash
The script detects the operating system, selects the matching package from the GitHub release manifest, verifies SHA256, installs dependencies, and leaves fwknopd ready for configuration export to PortGuard Client.
Open Source Release
Packages synced from GitHub
These packages are built automatically by GitHub Actions from the public PortGuard server source code.
| System | Version | Architecture | Package | הורד |
|---|---|---|---|---|
| Loading packages from GitHub release... | ||||
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آخر تحديث:
What is the relationship between PortGuard and fwknop?
PortGuard is built around the fwknop SPA protocol. PortGuard Client is a cross-platform client that sends fwknop-compatible SPA packets, while PortGuard Server is a modified server based on the upstream fwknop project. Compared with traditional sequence-based port knocking, this single encrypted packet model is faster, stealthier, and resistant to replay attacks.
האם אוכל ליצור פרופיל אחד ולהשתמש בלחיצה אחת כדי לאפשר ל-IP ספציפי לגשת לכל יציאת שירות?
כֵּן. הגדר את בית הגישה לשרת עם OPEN_PORTS ANY והשתמש בפרופיל לקוח עם ACCESS ANY. ניתן ליצור ולייבא את הפרופיל פעם אחת, ולאחר מכן לעשות שימוש חוזר. כל נקישה חוקית יוצרת כלל מקור-IP זמני המאפשר ל-IP שנבחר על ידי ALLOW_IP להגיע לכל יציאות השירות TCP ו-UDP עד שתוקף FW_TIMEOUT יפוג. לאחר התפוגה, שלח דפיקה חדשה. זהו מצב בעל הרשאות גבוהות: השתמש בפסק זמן קצר, הגן על הפרופיל והמפתחות, וזכור שחומות אש בענן במעלה הזרם, כללי נתב ואימות שירות עדיין חלים.
كيف يقارن fwknop مع tnock؟
كلاهما يهدف إلى إخفاء منافذ الشبكة، لكن fwknop حل SPA أكثر تقدماً. يعتمد tnock والحلول المشابهة القائمة على التسلسل على اكتشاف نمط محدد من محاولات الاتصال عبر عدة منافذ مغلقة، وهذا أبطأ وأكثر عرضة لهجمات الإعادة. يحل fwknop ذلك بإرسال حمولة واحدة موقعة تشفيرياً ومختومة زمنياً. المزايا: أمان أعلى بكثير، مقاومة لهجمات الإعادة، وتكامل سلس مع الجدران النارية الحديثة.
كيف أجعل موقعي أو خدمتي الخاصة متاحة فقط لأشخاص محددين؟
By default, PortGuard Server, modified from fwknop, configures your server's firewall to block all inbound traffic to your service port. The service appears completely offline to the public. When an authorized user needs access, they use PortGuard Client with their unique cryptographic key to send a fwknop-compatible Single Packet Authorization (SPA) packet. Once verified, the server dynamically whitelists their current IP address for a brief period.
كيف أضمن أمان وخصوصية NAS المعروض على الشبكة العامة بدون تسريب بيانات؟
تعريض NAS مباشرةً للإنترنت عالي الخطورة بسبب المسح المستمر من البوت نت وأدوات الفحص. عادةً هناك حلّان آمنان:
- الخطة 1: Cloudflare Zero Trust (Tunnels) يمرّر حركة NAS عبر شبكة Cloudflare دون فتح أي منافذ واردة. الإيجابيات: سهل جداً في الإعداد، لا يتطلب IP عاماً، ويوفر طبقة WAF إضافية. السلبيات: الحركة تمر عبر طرف ثالث، ما يعني الاعتماد على سياسة خصوصية Cloudflare، كما قد تكون السرعات محدودة في المسارات المجانية وغير مثالية لبث الملفات الكبيرة.
- الخطة 2: عنوان IP عام مستضاف ذاتياً + fwknop Port Knocking تفتح منفذاً على الموجّه لكن تحميه باستخدام fwknop (SPA). يبقى المنفذ غير مرئي على الإنترنت العام ولا يفتح إلا عند إرسال حزمة وصول صحيحة موقعة تشفيرياً. الإيجابيات: خصوصية بيانات عالية دون تمرير عبر طرف ثالث، وسرعة نقل قصوى بفضل الاتصال المباشر (ممتاز لبث الفيديو). السلبيات: يحتاج إلى عنوان IP عام حقيقي وإعداد أولي أكثر تقنية.
هل يبطئ fwknop PortGuard سرعة الاتصال بعد فتح المنفذ؟
No. The fwknop-compatible PortGuard Server only handles the initial authorization packet. Once the firewall rule is dynamically created and your IP is authorized, your connection via SSH, WireGuard, or directly to your NAS operates directly between your client and the server at full line speed.
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Official Contact
Need help with PortGuard?
For purchase recovery, activation issues, deployment questions, or security reports, contact the official PortGuard support mailbox.
[email protected]