ansible-playbooks/roles/common/templates/ssh/sshd_config.j2

{% if ansible_prolog -%}
{% from 'templates/ansible/prolog.j2' import prolog with context %}
{{ prolog() }}
{% endif -%}
# Package generated configuration file
# See the sshd_config(5) manpage for details

# What ports, IPs and protocols we listen for
{% for port in ssh_ports %}
Port {{ port }}
{% endfor %}

# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
{% if ansible_lsb.major_release|int >= 7 %}
HostKey /etc/ssh/ssh_host_ecdsa_key
{% endif %}
{% if ansible_lsb.major_release|int >= 8 %}
HostKey /etc/ssh/ssh_host_ed25519_key
{% endif %}
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

{% if not ssh_usedns %}
# Enable/Disable reverse DNS check
# Avois long lag in case of IPv6 connection with no reverse configured
UseDns no
{% endif %}

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 1024

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 120
PermitRootLogin without-password
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile	%h/.ssh/authorized_keys

# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes

# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no

# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no

# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication yes

# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

X11Forwarding no
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net

# Allow client to pass locale environment variables
AcceptEnv LANG LC_*

Subsystem sftp /usr/lib/openssh/sftp-server

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication.  Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes

# Maximum number of authentication attempts permitted per connection
MaxAuthTries 3

{% if ssh_allowed_users %}
# Define users allowed to login
AllowUsers {{ ssh_allowed_users | join(' ') }}
{% endif %}

{% if not ssh_allowed_users and ssh_allowed_groups %}
# Define users groups allowed to login
AllowGroups {{ ssh_allowed_groups | join(' ') }}
{% endif %}

{% if ssh_local_config is defined %}
# Additional parameters
{{ ssh_local_config|join('\n') }}
{% endif %}