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README.md
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# K4YT3X's hardened `sysctl.conf`
# K4YT3X's Hardened sysctl Configuration
This repository hosts my hardened version of `sysctl.conf`. This configuration file aims to provide better security for Linux systems, and improves system performance whenever possible.
This repository hosts my hardened version of `sysctl.conf`. This configuration file aims to provide better security for Linux systems, and improves system performance whenever possible. For example, below are some of the features this configuration file provies.
- Prevents kernel pointers from being read
- Disables Ptrace for all programs
- Disallows core dumping by SUID/GUID programs
- Disables IPv4/IPv6 routing
- Enables BBR TCP congestion control
- Enables SYN cookies to mitigate SYN flooding attacks
- Enables IP reverse path filtering for source validation
- ...
**Please review the configuration file carefully before applying it.** You are responsible for actions done to your own system.
Please be careful that this `sysctl.conf` is **designed for endpoint hosts that do not act as a router**. If you would like to use this configuration file on a router, please go over the configuration file and make necessary changes.
## Usages
1. Download the file `sysctl.conf` from the repository
1. Review the content of the `sysctl.conf` file to make sure all settings are suitable for your system
1. Backup your current `/etc/sysctl.conf` file (e.g., `cp /etc/sysctl.conf /etc/sysctl.conf.backup`)
1. Overwrite the old `sysctl.conf` file with the downloaded `sysctl.conf` file
1. Run command `sudo sysctl -p` or reboot the system to apply the changes
## `sysctl.conf` Content
```properties
# Name: K4YT3X Hardened sysctl Configuration
# Author: K4YT3X
# Date Created: October 5, 2020
# Last Updated: October 5, 2020
# Version 1.0
# Version: 1.0
# Licensed under the GNU General Public License Version 3 (GNU GPL v3),
# available at: https://www.gnu.org/licenses/gpl-3.0.txt

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sysctl.conf
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# Author: K4YT3X
# Date Created: October 5, 2020
# Last Updated: October 5, 2020
# Version 1.0
# Version: 1.0
# Licensed under the GNU General Public License Version 3 (GNU GPL v3),
# available at: https://www.gnu.org/licenses/gpl-3.0.txt