I specialize in designing and building secure, efficient Linux-based solutions tailored to your business needs, including system administration, virtualization, and cybersecurity enhancements.
Partnering with you to build a safer cyber world, one project at a time.
| Sebos Technology | https://richard-sebos.github.io/sebostechnology/ |
🔐 Tired of SSH keys that never expire?
New blog post: SSH Authentication Key Rotation: Why and How to Expire SSH Keys
• How to use AuthorizedKeysCommand
• Custom JSON-based expiry config
• Lightweight alternative to SSH CAs
Read it here:
➡️ https://richard-sebos.github.io/sebostechnology/posts/SSH-Auth-Key-Rotation/
🔐 Tired of bloated `sshd_config` files?
💡 Try modular SSH policies!
Our latest guide shows how to group SSH settings into reusable policy files using `Include`. Tackle brute-force attacks (like CVE-2024-6387), disable forwarding, enforce key-only logins, and apply IP-based rules.
🛠️ Cleaner configs = better security & scalability.
📚 Read more: https://richard-sebos.github.io/sebostechnology/posts/SSH-Polices/
📬 Contact: info@sebostechnology.com
#Linux #SSH #OpenSSH #Infosec #SysAdmin #DevOps #SecurityTools #SelfHost
🚀 New blog: Secure remote deployments with SSH Agent Forwarding & GitHub integration!
No more key duplication. No more risk.
✅ ForwardAgent configs
✅ ProxyJump usage
✅ GitHub access from jump hosts
📖 Read here: https://richard-sebos.github.io/sebostechnology/posts/Agent-Forwarding
Did you know the NSA built one of the best Linux security tools—and the FOSS community made it trustworthy?
That tool is SELinux.
This write-up explains:
What SELinux really does
How it labels and controls everything—even root
Why turning it off is a bad habit (and what to do instead)
🔗 https://richard-sebos.github.io/sebostechnology/posts/SELinux-Basics/
#SELinux #Linux #FOSS #CyberSecurity #PrivacyTech #SysAdmin #Infosec
SELinux (Security-Enhanced Linux) is that bodyguard. It’s a powerful security framework that enforces strict access controls at the kernel level, protecting your system from internal threats, misconfigurations, and privilege escalation—even when traditional permissions fail. Best of all? It’s free, flexible, and built into most major Linux distributions.
Tried integrating ROS2 on Oracle Linux with SELinux—no go.
Switched to AppArmor on Ubuntu—easier, yes. Effective? Not quite.
colcon and AppArmor don’t play well together. Turns out, AppArmor’s simplicity can limit it in complex dev environments.
Here’s my story, what didn’t work, and where I’m heading next:
🔗 https://richard-sebos.github.io/sebostechnology/posts/AppArmor-ROS2/
Boosts appreciated if you think secure ROS2 needs better tooling. 🧵
#Linux #FOSS #ROS2 #AppArmor #SELinux #DevSecOps #Security #Robotics
🔐 Tired of exposing your admin account to SSH risks?
Learn how to set up a restricted SSH user with rbash and switch to your admin account after login. A simple way to shrink your attack surface and boost security.
Full guide 👉 https://richard-sebos.github.io/sebostechnology/posts/Restricted-Access/
#Linux #SSH #SysAdmin #Security #Hardening #FOSS #DevOps #Infosec
