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Update port-knocking-and-spa.md
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@ -107,3 +107,44 @@ Certainly! Here are the links to the documentation for both Port Knocking and Si
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- Link: [fwknop: Single Packet Authorization (SPA) documentation](https://github.com/mrash/fwknop)
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Remember to refer to the official documentation, user guides, and community resources for the most accurate and up-to-date information on Port Knocking and SPA. These resources will provide more in-depth knowledge, configuration examples, and troubleshooting tips specific to each technique.
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## My SPA Cheat Sheet
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Certainly! Here's a cheat sheet for Single Packet Authorization (SPA):
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1. Install fwknop:
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- Ubuntu/Debian: `sudo apt-get install fwknop`
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2. Configure fwknop:
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- Edit `/etc/fwknop/fwknop.conf`:
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- Set `ENABLE_RULES` to `Y`.
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- Define `FW_ACCESS_TIMEOUT` to specify the access window duration.
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- Configure `AUTH_MODE` and set the appropriate authentication mode.
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- Specify `KEY_BASE64` or `KEY_FILE` with the shared secret.
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- Customize other options as needed.
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3. Generate SPA packet:
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- Run `fwknop --generate-key` to generate a new encryption key.
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- Use `fwknop --nmap <target_IP>` to generate an SPA packet for the target IP.
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- Copy the generated packet for future use.
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4. Configure firewall rules:
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- Use iptables or ufw to define initial firewall rules.
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- Block incoming traffic to desired services:
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- `sudo iptables -A INPUT -p tcp --dport <port_number> -j DROP`
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5. Configure firewall integration:
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- Edit `/etc/fwknop/access.conf`:
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- Specify the desired service name and port(s).
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- Define a SPA stanza with the correct access policy, such as `OPEN`.
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6. Modify firewall rules with SPA packet:
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- Run `fwknop -R -p <SPA_packet>` to modify firewall rules dynamically.
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- Firewall rules are adjusted to allow access for the specified service(s).
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7. Test SPA access:
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- From a separate network, send the SPA packet to the target IP.
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- Access should be granted to the specified service(s) during the access window.
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Remember to adjust the commands and paths based on your specific setup and Linux distribution. Consult the official **fwknop** documentation for detailed configuration options, advanced features, and troubleshooting tips.
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**Note**: This cheat sheet provides a general outline of the SPA setup process. It's recommended to refer to the official documentation and resources for **fwknop** and your chosen firewall management tool for more detailed instructions and advanced configurations.
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