shell-things/etc/ssh/sshd_config.d/00-basic-security.conf

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# RSA and Ed25519 are fine, but DSA is broken and ecdsa is suspicious
# Missing keys?
# ssh-keygen -t ed25519 -N "" -f /etc/ssh/ssh_host_ed25519_key
# ssh-keygen -t rsa -N "" -f /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
# Includes public keys in logins
LogLevel VERBOSE
# No direct root login, keys might be ok, but audit trail...
PermitRootLogin no
#...unless we happen to be on SteamOS on Steam Deck where we probably don't
# care about audit trail by user deck and where keyed SSH may be preferable
# over having a password?
#PermitRootLogin prohibit-password
# Passwords are bad
PasswordAuthentication no
AuthenticationMethods publickey
# Log sftp level file access (read/write/etc.) that would not be easily logged otherwise.
# Debian
#Subsystem sftp /usr/lib/ssh/sftp-server -f AUTHPRIV -l INFO
# Fedora
#Subsystem sftp /usr/libexec/openssh/sftp-server -f AUTHPRIV -l INFO