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Enumerate steps
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@ -4,34 +4,34 @@
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# Server
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# Server
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## Remove existing key-pairs, disable DSA & ECDSA
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1. Remove existing key-pairs, disable DSA & ECDSA
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rm -f /etc/ssh/ssh_host_*
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rm -f /etc/ssh/ssh_host_*
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sysrc sshd_dsa_enable="no"
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sysrc sshd_dsa_enable="no"
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sysrc sshd_ecdsa_enable="no"
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sysrc sshd_ecdsa_enable="no"
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sysrc sshd_ed25519_enable="yes"
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sysrc sshd_ed25519_enable="yes"
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sysrc sshd_rsa_enable="yes"
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sysrc sshd_rsa_enable="yes"
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## Regenerate RSA and Ed25519 keys
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2. Regenerate RSA and Ed25519 keys
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ssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -N ""
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ssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -N ""
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ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ""
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ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ""
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## Remove Diffie-Hellman moduli smaller than 3071
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3. Remove Diffie-Hellman moduli smaller than 3071
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awk '$5 >= 3071' /etc/ssh/moduli > /etc/ssh/moduli.safe
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awk '$5 >= 3071' /etc/ssh/moduli > /etc/ssh/moduli.safe
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mv /etc/ssh/moduli.safe /etc/ssh/moduli
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mv /etc/ssh/moduli.safe /etc/ssh/moduli
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## Restrict supported key exchange, cipher, and MAC algorithms
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4. Restrict supported key exchange, cipher, and MAC algorithms
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printf "\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\n" >> /etc/ssh/sshd_config
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printf "\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\n" >> /etc/ssh/sshd_config
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## Restart sshd
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5. Restart sshd
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service sshd restart
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service sshd restart
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# Client
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# Client
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## Run the following in a terminal to harden the OpenSSH client for the local user
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1. Run the following in a terminal to harden the OpenSSH client for the local user
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mkdir -p -m 0700 ~/.ssh; printf "\nHost *\n Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr\n KexAlgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha256\n MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com\n HostKeyAlgorithms ssh-ed25519,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-256,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-512-cert-v01@openssh.com\n" >> ~/.ssh/config
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mkdir -p -m 0700 ~/.ssh; printf "\nHost *\n Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr\n KexAlgorithms sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha256\n MACs hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,umac-128-etm@openssh.com\n HostKeyAlgorithms ssh-ed25519,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-256,rsa-sha2-256-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-512-cert-v01@openssh.com\n" >> ~/.ssh/config
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