REFACTOR: move SSH hardening into a separated role

roles/harden_ssh/files/.vimrc

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+set number
+set tabstop=2
+" Disable compatibility with vi which can cause unexpected issues.
+set nocompatible
+
+" Enable type file detection. Vim will be able to try to detect the type of file in use.
+filetype on
+
+" Enable plugins and load plugin for the detected file type.
+filetype plugin on
+
+" Load an indent file for the detected file type.
+filetype indent on
+
+" Turn syntax highlighting on.
+syntax on

roles/harden_ssh/files/.zshrc

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+export PATH=$HOME/bin:$HOME/.local/bin:/usr/local/bin:/home/max/soft/gnu_linux:$PATH
+
+# Path to your Oh My Zsh installation.
+export ZSH="$HOME/.oh-my-zsh"
+
+export GTK_THEME=Adwaita-dark
+
+# Set name of the theme to load --- if set to "random", it will
+# load a random theme each time Oh My Zsh is loaded, in which case,
+# to know which specific one was loaded, run: echo $RANDOM_THEME
+# See https://github.com/ohmyzsh/ohmyzsh/wiki/Themes
+ZSH_THEME="gnzh"
+
+# Set list of themes to pick from when loading at random
+# Setting this variable when ZSH_THEME=random will cause zsh to load
+# a theme from this variable instead of looking in $ZSH/themes/
+# If set to an empty array, this variable will have no effect.
+# ZSH_THEME_RANDOM_CANDIDATES=( "robbyrussell" "agnoster" )
+
+# Uncomment the following line to use case-sensitive completion.
+# CASE_SENSITIVE="true"
+
+# Uncomment the following line to use hyphen-insensitive completion.
+# Case-sensitive completion must be off. _ and - will be interchangeable.
+# HYPHEN_INSENSITIVE="true"
+
+# Uncomment one of the following lines to change the auto-update behavior
+# zstyle ':omz:update' mode disabled  # disable automatic updates
+# zstyle ':omz:update' mode auto      # update automatically without asking
+# zstyle ':omz:update' mode reminder  # just remind me to update when it's time
+
+# Uncomment the following line to change how often to auto-update (in days).
+# zstyle ':omz:update' frequency 13
+
+# Uncomment the following line if pasting URLs and other text is messed up.
+# DISABLE_MAGIC_FUNCTIONS="true"
+
+# Uncomment the following line to disable colors in ls.
+# DISABLE_LS_COLORS="true"
+
+# Uncomment the following line to disable auto-setting terminal title.
+# DISABLE_AUTO_TITLE="true"
+
+# Uncomment the following line to enable command auto-correction.
+# ENABLE_CORRECTION="true"
+
+# Uncomment the following line to display red dots whilst waiting for completion.
+# You can also set it to another string to have that shown instead of the default red dots.
+# e.g. COMPLETION_WAITING_DOTS="%F{yellow}waiting...%f"
+# Caution: this setting can cause issues with multiline prompts in zsh < 5.7.1 (see #5765)
+# COMPLETION_WAITING_DOTS="true"
+
+# Uncomment the following line if you want to disable marking untracked files
+# under VCS as dirty. This makes repository status check for large repositories
+# much, much faster.
+# DISABLE_UNTRACKED_FILES_DIRTY="true"
+
+# Uncomment the following line if you want to change the command execution time
+# stamp shown in the history command output.
+# You can set one of the optional three formats:
+# "mm/dd/yyyy"|"dd.mm.yyyy"|"yyyy-mm-dd"
+# or set a custom format using the strftime function format specifications,
+# see 'man strftime' for details.
+# HIST_STAMPS="mm/dd/yyyy"
+
+# Would you like to use another custom folder than $ZSH/custom?
+# ZSH_CUSTOM=/path/to/new-custom-folder
+
+# Which plugins would you like to load?
+# Standard plugins can be found in $ZSH/plugins/
+# Custom plugins may be added to $ZSH_CUSTOM/plugins/
+# Example format: plugins=(rails git textmate ruby lighthouse)
+# Add wisely, as too many plugins slow down shell startup.
+#plugins=(git)
+
+source $ZSH/oh-my-zsh.sh
+
+# User configuration
+
+# export MANPATH="/usr/local/man:$MANPATH"
+
+# You may need to manually set your language environment
+# export LANG=en_US.UTF-8
+
+# Preferred editor for local and remote sessions
+# if [[ -n $SSH_CONNECTION ]]; then
+#   export EDITOR='vim'
+# else
+#   export EDITOR='nvim'
+# fi
+
+# Compilation flags
+# export ARCHFLAGS="-arch $(uname -m)"
+
+# Set personal aliases, overriding those provided by Oh My Zsh libs,
+# plugins, and themes. Aliases can be placed here, though Oh My Zsh
+# users are encouraged to define aliases within a top-level file in
+# the $ZSH_CUSTOM folder, with .zsh extension. Examples:
+# - $ZSH_CUSTOM/aliases.zsh
+# - $ZSH_CUSTOM/macos.zsh
+# For a full list of active aliases, run `alias`.
+#
+# Example aliases
+# alias zshconfig="mate ~/.zshrc"
+# alias ohmyzsh="mate ~/.oh-my-zsh"

roles/harden_ssh/files/hardened_ssh.conf

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+ Host *
+    HashKnownHosts yes
+    GSSAPIAuthentication yes
+    KexAlgorithms mlkem768x25519-sha256,sntrup761x25519-sha512,curve25519-sha256

roles/harden_ssh/files/hardened_sshd.conf

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+PubkeyAuthentication yes
+AuthorizedKeysFile	.ssh/authorized_keys
+PasswordAuthentication no
+KbdInteractiveAuthentication no
+UsePAM no
+# Disable password authentication — keys only
+PasswordAuthentication no
+ChallengeResponseAuthentication no
+
+
+AllowGroups sshusers
+PrintMotd no
+AcceptEnv LANG LC_*
+ClientAliveCountMax 0
+ClientAliveInterval 300
+Port 22
+
+
+# Disable root login entirely
+PermitRootLogin no
+
+# Limit authentication attempts
+MaxAuthTries 3
+MaxSessions 3
+
+# Use modern key exchange and ciphers, prioritize post-quantum algorithms (mlkem and sntrup)
+KexAlgorithms mlkem768x25519-sha256,sntrup761x25519-sha512,sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org
+Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com
+MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com

roles/harden_ssh/tasks/main.yaml

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+---
+
+- name: Configure ssh-server daemon
+  ansible.builtin.copy:
+    src: "{{ role_path }}/files/hardened_sshd.conf"
+    dest: /etc/ssh/sshd_config.d/hardened_sshd.conf
+    mode: u=rw,g=r,o=r
+  when: ansible_facts['distribution'] == 'Ubuntu'
+
+- name: Configure ssh-server daemon
+  ansible.builtin.copy:
+    src: "{{ role_path }}/files/hardened_sshd.conf"
+    dest: /etc/ssh/sshd_config.d/hardened_sshd.conf
+    mode: u=rw,g=r,o=r
+  when: ansible_facts['distribution'] == 'Debian'
+
+- name: Configure ssh client
+  remote_user: ansible
+  ansible.builtin.copy:
+    src: "{{ role_path }}/files/hardened_ssh.conf"
+    dest: /etc/ssh/ssh_config.d/hardened_ssh.conf
+    mode: u=rw,g=r,o=r
+
+- name: Restart ssh-server Debian
+  remote_user: ansible
+  ansible.builtin.service:
+    name: sshd
+    state: restarted
+  when: ansible_facts['distribution'] == 'Debian'
+
+- name: Restart ssh-server Ubuntu
+  remote_user: ansible
+  ansible.builtin.service:
+    name: ssh
+    state: restarted
+  when: ansible_facts['distribution'] == 'Ubuntu'