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-+++
-date = 2023-10-15
-title = "SSH Hardening for Alpine Linux"
-description = "A quick guide to harden SSH configuration on Alpine."
-+++
-
-## Overview
-
-This guide follows the standard
-[ssh-audit](https://www.ssh-audit.com/hardening_guides.html) hardening
-guide, tweaked for Alpine Linux.
-
-## Hardening Guide
-
-These steps must be performed as root. You can try to use
-`doas` or `sudo`, but there may be issues.
-
-1.  Re-generate the RSA and ED25519 keys
-
-```sh
-rm /etc/ssh/ssh_host_*
-ssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -N ""
-ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ""
-```
-
-2.  Remove small Diffie-Hellman moduli
-
-```sh
-awk '$5 >= 3071' /etc/ssh/moduli > /etc/ssh/moduli.safe
-mv /etc/ssh/moduli.safe /etc/ssh/moduli
-```
-
-3.  Enable the RSA and ED25519 HostKey directives in the
-    /etc/ssh/sshd~config~ file
-
-```sh
-sed -i 's/^\#HostKey \/etc\/ssh\/ssh_host_\(rsa\|ed25519\)_key$/HostKey \/etc\/ssh\/ssh_host_\1_key/g' /etc/ssh/sshd_config
-```
-
-4.  Restrict supported key exchange, cipher, and MAC algorithms
-
-```sh
-echo -e "\n# Restrict key exchange, cipher, and MAC algorithms, as per sshaudit.com\n# hardening guide.\nKexAlgorithms [email protected],curve25519-sha256,[email protected],diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha256\nCiphers [email protected],[email protected],[email protected],aes256-ctr,aes192-ctr,aes128-ctr\nMACs [email protected],[email protected],[email protected]\nHostKeyAlgorithms ssh-ed25519,[email protected],[email protected],[email protected],rsa-sha2-512,[email protected],rsa-sha2-256,[email protected]" > /etc/ssh/sshd_config.d/ssh-audit_hardening.conf
-```
-
-5.  Include the /etc/ssh/sshd~config~.d directory
-
-```sh
-echo -e "Include /etc/ssh/sshd_config.d/*.conf" > /etc/ssh/sshd_config
-```
-
-6.  Restart OpenSSH server
-
-```sh
-rc-service sshd restart
-```
-
-## Testing SSH
-
-You can test the results with the `ssh-audit` python script.
-
-```sh
-pip3 install ssh-audit
-ssh-audit localhost
-```
-
-If everything succeeded, the results will show as all green. If anything
-is yellow, orange, or red, you may need to tweak additional settings.
-
-```txt
-#+caption: ssh audit
-```
-
-![ssh-audit](https://img.cleberg.net/blog/20231015-ssh-hardening/ssh-audit.png "ssh-audit")