Force Restart Nginxįor major configuration changes, you can force a full restart of Nginx. Restrict supported key exchange, cipher, and MAC algorithms echo -e "\n# Only enable RSA and ED25519 host keys.\nHostKey /etc/ssh/ssh_host_rsa_key\nHostKey /etc/ssh/ssh_host_ed25519_key\n\n# Restrict key exchange, cipher, and MAC algorithms, as per \n# hardening guide.Note: Nginx cannot be reloaded if the the Nginx service is not active.Ssh-keygen -t ed25519 -f ssh_host_ed25519_key -N ""īe sure to upload the following 4 files to the target device's /etc/ssh directory: Ssh-keygen -t rsa -b 4096 -f ssh_host_rsa_key -N "" Some IoT devices do not have good entropy sources to generate sufficient keys with! Re-generate the RSA and ED25519 keys Note: It is highly recommended that you run the ssh-keygen commands below on another host.Ubuntu Core 18 Server Last modified: October 6, 2019 Ubuntu 14.04 LTS Server Last modified: October 17, 2017 Disable the RSA, DSA, and ECDSA host keysComment out the RSA, DSA and ECDSA HostKey directives in the /etc/ssh/sshd_config file:.Re-generate ED25519 key rm /etc/ssh/ssh_host_*.Ubuntu 16.04 LTS Server Last modified: July 6, 2020 Restrict supported key exchange, cipher, and MAC algorithms echo -e "\n# Restrict key exchange, cipher, and MAC algorithms, as per \n# hardening guide.\nKexAlgorithms > /etc/ssh/sshd_config.Disable the DSA and ECDSA host keysComment out the DSA and ECDSA HostKey directives in the /etc/ssh/sshd_config file:.Ubuntu 18.04 LTS Server Last modified: February 8, 2020 Ubuntu 20.04 LTS Server Last modified: July 27, 2020 Note: Because of a bug in OpenSSH, 2048-bit DH moduli will still be used in some limited circumstances. Restart OpenSSH server service ssh restart.Restrict supported key exchange, cipher, and MAC algorithms echo -e "\n# Restrict key exchange, cipher, and MAC algorithms, as per \n# hardening guide.\nKexAlgorithms > /etc/ssh/sshd_config.d/ssh-audit_nf.Enable the RSA and ED25519 keysEnable the RSA and ED25519 HostKey directives in the /etc/ssh/sshd_config file:.Remove small Diffie-Hellman moduli awk '$5 >= 3071' /etc/ssh/moduli > /etc/ssh/moduli.safe.Ssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -N "" Re-generate the RSA and ED25519 keys rm /etc/ssh/ssh_host_*.Note: all commands below are to be executed as the root user. Ubuntu 22.04 LTS Server Last modified: September 5, 2022 Instructions for submitting a hardening guide can be found here. They have not been officially tested, and are not officially supported: The following guides have been written by the community. These guides were inspired by this document (which is now out-dated). However, these instructions will result in the best possible score. Note that following them may not result in a perfect auditing score, as not all packaged SSH server versions support the required options. Below are guides to hardening SSH on various systems.
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