library/roles/sshd_config: Role that installs a personalized ssh server configuration file.

d4science-ghn-cluster/smartgears.yml: One task for all the smartgears installation variants.
d4science-ghn-cluster/group_vars/egi_smartexecutor/all.yml: ssh parameters.

sshd_config/defaults/main.yml

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+---
+sshd_port: 22
+sshd_config_dir: /etc/ssh
+sshd_config_file: sshd_config
+sshd_protocol: 2
+sshd_serverkeybits: 2048
+sshd_password_authentication: "no"
+sshd_permit_empty_passwords: "no"
+# "no" or "without-password"
+sshd_permit_root_login: "without-password"
+sshd_strict_mode: "yes"
+sshd_use_pam: "yes"
+# set to "yes" only if you are using s/key or something equivalent
+sshd_challenge_response_authentication: "no"
+sshd_enable_sftp_subsystem: True
+sshd_use_login: "no"
+sshd_permit_tunnel: "yes"
+sshd_gssapi_authentication: "no"
+sshd_gssapi_credentials: "no"
+sshd_x11_forwarding: "no"
+sshd_agent_forwarding: "yes"
+sshd_tcp_forwarding: "no"
+sshd_permit_user_environment: "no"
+sshd_show_patchlevel: "no"
+# Usually /etc/issue.net
+sshd_banner_path: "none"
+sshd_acceptenv: "LANG LC_*"

sshd_config/handlers/main.yml

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+---
+- name: Reload the ssh service
+  service: name=ssh state=reloaded

sshd_config/tasks/main.yml

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+---
+- name: Install the sshd configuration file
+  template: src=sshd_config.j2 dest={{ sshd_config_dir }}/{{ sshd_config_file }} owner=root group=root mode=0644
+  notify: Reload the ssh service
+  tags: [ 'ssh', 'sshd_config' ]

sshd_config/templates/sshd_config.j2

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+# What ports, IPs and protocols we listen for
+Port {{ sshd_port }}
+# Use these options to restrict which interfaces/protocols sshd will bind to
+#ListenAddress ::
+#ListenAddress 0.0.0.0
+Protocol {{ sshd_protocol }}
+# HostKeys for protocol version 2
+HostKey /etc/ssh/ssh_host_rsa_key
+HostKey /etc/ssh/ssh_host_dsa_key
+HostKey /etc/ssh/ssh_host_ecdsa_key
+HostKey /etc/ssh/ssh_host_ed25519_key
+#Privilege Separation is turned on for security
+UsePrivilegeSeparation yes
+
+# Lifetime and size of ephemeral version 1 server key
+KeyRegenerationInterval 3600
+ServerKeyBits {{ sshd_serverkeybits }}
+
+# Logging
+SyslogFacility AUTH
+LogLevel INFO
+
+# Authentication:
+LoginGraceTime 120
+PermitRootLogin {{ sshd_permit_root_login }}
+StrictModes {{ sshd_strict_mode }}
+
+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 {{ sshd_permit_empty_passwords }}
+
+# Change to yes to enable challenge-response passwords (beware issues with
+# some PAM modules and threads)
+ChallengeResponseAuthentication {{ sshd_challenge_response_authentication }}
+
+# Change to no to disable tunnelled clear text passwords
+PasswordAuthentication {{ sshd_password_authentication }}
+
+# Kerberos options
+#KerberosAuthentication no
+#KerberosGetAFSToken no
+#KerberosOrLocalPasswd yes
+#KerberosTicketCleanup yes
+
+# GSSAPI options
+GSSAPIAuthentication {{ sshd_gssapi_authentication }}
+GSSAPICleanupCredentials {{ sshd_gssapi_credentials }}
+
+PermitTunnel {{ sshd_permit_tunnel }}
+X11Forwarding {{ sshd_x11_forwarding }}
+X11DisplayOffset 10
+PrintMotd no
+PrintLastLog yes
+TCPKeepAlive yes
+UseLogin {{ sshd_use_login }}
+AllowAgentForwarding {{ sshd_agent_forwarding }}
+AllowTcpForwarding {{ sshd_tcp_forwarding }}
+PermitUserEnvironment {{ sshd_permit_user_environment }}
+ShowPatchLevel {{ sshd_show_patchlevel }}
+
+#MaxStartups 10:30:60
+Banner {{ sshd_banner_path }}
+
+
+# Allow client to pass locale environment variables
+AcceptEnv LANG LC_*
+
+{% if sshd_enable_sftp_subsystem %}
+Subsystem sftp /usr/lib/openssh/sftp-server
+{% endif %}
+
+# 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 {{ sshd_use_pam }}