---
# General settings
ssh_protocol: 2
ssh_permit_root_login: "no"
ssh_password_authentication: "no"
ssh_challenge_response_authentication: "no"
ssh_kerberos_authentication: "no"
ssh_gssapi_authentication: "no"
ssh_use_pam: "yes"
PrintLastLog: "yes"

# Session security
ssh_x11_forwarding: "no"
ssh_allow_tcp_forwarding: "yes"
ssh_permit_tunnel: "no"
ssh_allow_agent_forwarding: "no"

# Idle timeout / login attempts
ssh_client_alive_interval: 300
ssh_client_alive_count_max: 3
ssh_login_grace_time: 60
ssh_max_auth_tries: 3
ssh_max_sessions: 2
ssh_max_startups: "10:30:60"

# SSH access restrictions
ssh_allow_users: "adminuser ansibleuser"

# Strong encryption
ssh_ciphers: "aes256-ctr,aes192-ctr,aes128-ctr"
ssh_macs: "hmac-sha2-512,hmac-sha2-256"
ssh_kex_algorithms: "curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256"