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-#+title: SSH Hardening for Alpine Linux
-#+date: 2023-10-15
-#+description: A quick guide to harden SSH configuration on Alpine.
-#+filetags: :linux:
-
-* Overview
-This guide follows the standard
-[[https://www.ssh-audit.com/hardening_guides.html][ssh-audit]] 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
-
-#+begin_src 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 ""
-#+end_src
-
-2. [@2] Remove small Diffie-Hellman moduli
-
-#+begin_src sh
-awk '$5 >= 3071' /etc/ssh/moduli > /etc/ssh/moduli.safe
-mv /etc/ssh/moduli.safe /etc/ssh/moduli
-#+end_src
-
-3. [@3] Enable the RSA and ED25519 HostKey directives in the
-   /etc/ssh/sshd_{config} file
-
-#+begin_src sh
-sed -i 's/^\#HostKey \/etc\/ssh\/ssh_host_\(rsa\|ed25519\)_key$/HostKey \/etc\/ssh\/ssh_host_\1_key/g' /etc/ssh/sshd_config
-#+end_src
-
-4. [@4] Restrict supported key exchange, cipher, and MAC algorithms
-
-#+begin_src sh
-echo -e "\n# Restrict key exchange, cipher, and MAC algorithms, as per sshaudit.com\n# hardening guide.\nKexAlgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha256\nCiphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr\nMACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com\nHostKeyAlgorithms ssh-ed25519,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256,rsa-sha2-256-cert-v01@openssh.com" > /etc/ssh/sshd_config.d/ssh-audit_hardening.conf
-#+end_src
-
-5. [@5] Include the /etc/ssh/sshd_{config}.d directory
-
-#+begin_src sh
-echo -e "Include /etc/ssh/sshd_config.d/*.conf" > /etc/ssh/sshd_config
-#+end_src
-
-6. [@6] Restart OpenSSH server
-
-#+begin_src sh
-rc-service sshd restart
-#+end_src
-
-* Testing SSH
-You can test the results with the =ssh-audit= python script.
-
-#+begin_src sh
-pip3 install ssh-audit
-ssh-audit localhost
-#+end_src
-
-If everything succeeded, the results will show as all green. If anything
-is yellow, orange, or red, you may need to tweak additional settings.
-
-#+begin_src txt
-,#+caption: ssh audit
-#+end_src
-
-#+caption: ssh-audit
-[[https://img.cleberg.net/blog/20231015-ssh-hardening/ssh-audit.png]]