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Secure SSH Config
# Recommendations from https://stribika.github.io/2015/01/04/secure-secure-shell.html
# Github needs diffie-hellman-group-exchange-sha1 some of the time but not always.
#Host github.com
# KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1
Host *
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
Host *
PasswordAuthentication no
ChallengeResponseAuthentication no
Host *
PubkeyAuthentication yes
HostKeyAlgorithms ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,ssh-rsa
Host *
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
Host *
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128@openssh.com
Host *
UseRoaming no
# Recommendations from https://stribika.github.io/2015/01/04/secure-secure-shell.html
KexAlgorithms curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256
Protocol 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
PasswordAuthentication no
ChallengeResponseAuthentication no
PubkeyAuthentication yes
# Unpractical for the forge user in case of reprovision?
# AllowGroups ssh-user
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-ripemd160-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,hmac-ripemd160,umac-128@openssh.com
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