Add role for deploying SSH config and also add mailserver-endpoint host

This commit is contained in:
June 2023-06-06 23:37:42 +02:00 committed by julian
parent ebfa591484
commit 0c62a8f3e0
6 changed files with 256 additions and 0 deletions

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send-only-mailserver: send-only-mailserver:
ansible_host: send-only-mailserver.z9.ccchh.net ansible_host: send-only-mailserver.z9.ccchh.net
ansible_user: chaos ansible_user: chaos
mailserver-endpoint:
ansible_host: mailserver-endpoint.ccchh.net
ansible_user: chaos

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---
- name: Deploy stuff on mailserver-endpoint.ccchh.net
hosts: mailserver-endpoint
roles:
- deploy_ssh_server_config

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# Role `deploy_ssh_server_config`
This role deploys an SSH server config on the specified hosts.
## `hosts`
The `hosts` for this role need to be the machines, for which you want to deploy an SSH server config.
## Required Variables
This role doesn't have nay required variables.
## Links & Resources
- <https://infosec.mozilla.org/guidelines/openssh>
- Also see [Debian 11 cloud 2023-04-21 default /etc/ssh/sshd_config](docs/Debian_11_cloud_2023-04-21_default_etc_ssh_sshd_config).

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# $OpenBSD: sshd_config,v 1.103 2018/04/09 20:41:22 tj Exp $
# This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information.
# This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options override the
# default value.
Include /etc/ssh/sshd_config.d/*.conf
#Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress ::
#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key
# Ciphers and keying
#RekeyLimit default none
# Logging
#SyslogFacility AUTH
#LogLevel INFO
# Authentication:
#LoginGraceTime 2m
#PermitRootLogin prohibit-password
#StrictModes yes
#MaxAuthTries 6
#MaxSessions 10
#PubkeyAuthentication yes
# Expect .ssh/authorized_keys2 to be disregarded by default in future.
#AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2
#AuthorizedPrincipalsFile none
#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes
# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication no
#PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no
# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no
# 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
#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#X11DisplayOffset 10
#X11UseLocalhost yes
#PermitTTY yes
PrintMotd no
#PrintLastLog yes
#TCPKeepAlive yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /var/run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none
# no default banner path
#Banner none
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
# override default of no subsystems
Subsystem sftp /usr/lib/openssh/sftp-server
# Example of overriding settings on a per-user basis
#Match User anoncvs
# X11Forwarding no
# AllowTcpForwarding no
# PermitTTY no
# ForceCommand cvs server
ClientAliveInterval 120

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# This is the sshd server system-wide configuration file deployed and managed by
# Ansible.
# See sshd_config(5) and the "deploy_ssh_server_config" Ansible role for more
# information.
# This config doesn't set all options and leaves some to the sshd defaults.
# The sshd defaults should be alright, so this config is only really setting
# options in cases where we want to intentionally have an option a certain way
# for some reason or another. For example for hardening, improved loggin, etc.
## Use the HostKey preference, Ciphers and algorithms from Mozillas Modern
## guidelines.
# Supported HostKey algorithms by order of preference.
HostKey /etc/ssh/ssh_host_ed25519_key
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256
Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-512,hmac-sha2-256,umac-128@openssh.com
## Authentication Settings.
# Require only "publickey" for authentication.
# From Mozillas Modern guidelines.
AuthenticationMethods publickey
# Enable "PubkeyAuthentication" accordingly.
PubkeyAuthentication yes
# Don't do the other authentication types.
PasswordAuthentication no
ChallengeResponseAuthentication no
KerberosAuthentication no
GSSAPIAuthentication no
# Don't allow root login.
PermitRootLogin no
# Set this to "yes", but have "PasswordAuthentication" and
# "ChallengeResponseAuthentication" set to "no", to have account and session
# checks run.
# See "docs/Debian_11_cloud_2023-04-21_default_etc_ssh_sshd_config" for more
# information.
UsePAM yes
## Miscellaneous Settings.
# X11 forwarding shouldn't be needed.
X11Forwarding no
# Printing this isn't needed.
PrintMotd no
# Print time and date of last login, since that's nice.
PrintLastLog yes
# Disable general environment processing.
PermitUserEnvironment no
# Allow client to pass locale environment variables.
# From "docs/Debian_11_cloud_2023-04-21_default_etc_ssh_sshd_config".
AcceptEnv LANG LC_*
# Request response from client after 120 seconds of no communication.
# Taken from "docs/Debian_11_cloud_2023-04-21_default_etc_ssh_sshd_config".
ClientAliveInterval 120
## Logging
# Set "LogLevel" to "VERBOSE" to log users key fingerprints on login.
# This is needed for a clear audit track.
# From Mozillas Modern guidelines.
LogLevel VERBOSE
# Enable the sftp subsystem and log properly.
# From Mozillas Modern guidelines and
# "docs/Debian_11_cloud_2023-04-21_default_etc_ssh_sshd_config".
Subsystem sftp /usr/lib/openssh/sftp-server -f AUTHPRIV -l INFO

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# Role and config created after: https://infosec.mozilla.org/guidelines/openssh
- name: deploy SSH server config
become: true
block:
- name: deploy `sshd_config`
ansible.builtin.copy:
force: true
dest: /etc/ssh/sshd_config
mode: 0644
owner: root
group: root
src: sshd_config
register: deploy_ssh_server_config__ssh_config_copy_result
- name: deactivate short moduli
ansible.builtin.shell:
cmd: awk '$5 >= 3071' /etc/ssh/moduli > /etc/ssh/moduli.tmp && mv /etc/ssh/moduli.tmp /etc/ssh/moduli
# Rebooting here instead of restarting the ssh service, since I don't know how Ansible reacts, when it restarts the service it probably needs for the connection.
- name: reboot, if ssh server config got changed
ansible.builtin.reboot:
when: deploy_ssh_server_config__ssh_config_copy_result.changed