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# Parameters that have sane defaults on Debian 11 are omitted.

{% set ssh_port = hostvars[inventory_hostname].ansible_port %}
{% set ssh_user = hostvars[inventory_hostname].ansible_user %}

{% set groups = [ssh_user] + ssh_allowed_groups %}
{% set groups = groups | sort | unique %}

Port {{ ssh_port }}

# Whitelist users:
PermitRootLogin no
AllowGroups {{ groups | join(' ') }}

# Only public key authentication:
PasswordAuthentication no
ChallengeResponseAuthentication no
AuthenticationMethods publickey

# Whitelist accepted environment variables:
AcceptEnv LANG LC_*

# Drop idle sessions:
ClientAliveCountMax 3
ClientAliveInterval 15

# Miscellaneous:
PrintMotd no
Subsystem sftp /usr/lib/openssh/sftp-server