Port 22

PermitRootLogin No
Protocol 2
AuthorizedKeysFile .ssh/authorized_keys
GSSAPIAuthentication no
KerberosAuthentication no
ChallengeResponseAuthentication no
PasswordAuthentication no
PubkeyAuthentication yes
UseDNS no

LogLevel INFO
X11Forwarding no
IgnoreRhosts yes
HostbasedAuthentication no
PermitEmptyPasswords no
PermitUserEnvironment no
Ciphers chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-256,hmac-sha2-512
KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,ecdh-sha2-nistp521,ecdh-sha2-nistp256,ecdh-sha2-nistp384,diffie-hellman-group-exchange-sha256
LoginGraceTime 60
AllowUsers ${' '.join(sorted(login_users))}
UsePAM yes
AllowTcpForwarding no
PrintMotd no

MaxSessions 512
MaxStartups 512:30:768

Subsystem sftp internal-sftp

Match Group sftp
    ChrootDirectory %h
    ForceCommand internal-sftp
    PasswordAuthentication no

Match User ${','.join(sorted(admin_users))}
    AllowTcpForwarding yes
% if enable_x_forwarding_for_admins:
    X11Forwarding yes
% endif