provision_server.yaml

#
# provision_server.yaml
# Author: Joel Hans, for SSD Nodes
#
# This script aims to accomplish a few simple tasks:
#   * Create a new user with `sudo` access
#   * Enable SSH key-based authentication
#   * Harden SSH with some simple-but-logical options
#   * Install a few packages for convenience
#

---
- hosts: ssdnodes
  remote_user: root

  vars_prompt:

    - name: "user_name"
      prompt: "Enter a name for the new user"
      private: no
      confirm: yes

    - name: "user_password"
      prompt: "Enter a password for the new user"
      private: yes
      encrypt: "sha512_crypt"
      confirm: yes
      salt_size: 7

  tasks:

    - name: Check to make sure we have a 'wheel' group
      group:
        name: wheel
        state: present

    - name: Enabling su/sudo access for wheel group
      lineinfile:
        dest: /etc/pam.d/su
        state: present
        regexp: '^#?auth       required   pam_wheel.so'
        line: 'auth       required   pam_wheel.so'
      when: ansible_os_family == "Debian"

    - name: Install the 'sudo' package
      package:
        name: sudo
        state: latest

    - name: Create the non-root user
      user:
        name: "{{ user_name }}"
        password: "{{ user_password }}"
        shell: "/bin/bash"
        groups: "wheel"

    - name: Add local public key for key-based SSH authentication
      authorized_key:
        user: "{{ user_name }}"
        key: "{{ item }}"
      with_file:
        - ~/.ssh/id_rsa.pub

    - name: Harden sshd configuration
      lineinfile:
        dest: /etc/ssh/sshd
        regexp: "{{ item.regexp }}"
        line: "{{ item.line }}"
      with_items:
        - { regexp: "^#?PermitRootLogin", line: "PermitRootLogin no" }
        - { regexp: "^^#?PasswordAuthentication", line: "PasswordAuthentication no" }
        - { regexp: "^#?AllowAgentForwarding", line: "AllowAgentForwarding no" }
        - { regexp: "^#?AllowTcpForwarding", line: "AllowTcpForwarding no" }
        - { regexp: "^#?MaxAuthTries", line: "MaxAuthTries 2" }
        - { regexp: "^#?MaxSessions", line: "MaxSessions 2" }
        - { regexp: "^#?TCPKeepAlive", line: "TCPKeepAlive no" }
        - { regexp: "^#?UseDNS", line: "UseDNS no" }
        - { regexp: "^#?AllowAgentForwarding", line: "AllowAgentForwarding no" }

    - name: Restart sshd
      systemd:
        state: restarted
        daemon_reload: yes
        name: sshd

    - name: Install a few more packages for the sake of convenience
      package: name={{item}} state=installed
      with_items:
       - nano
       - vim
       - htop