Initialize Project

playbooks/roles/access/files/fail2ban.local

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+[Definition]
+# 24 hours
+dbpurgeage = 86400

playbooks/roles/access/files/jail.local

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+[INCLUDES]
+[DEFAULT]
+# "maxretry" is the number of failures before a host get banned.
+maxretry = 4
+backend = systemd
+[sshd]
+[sshd-ddos]
+[dropbear]
+[selinux-ssh]
+[nginx-http-auth]
+[nginx-botsearch]
+[recidive]
+maxretry = 3
+enabled = true

playbooks/roles/access/files/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 no
+#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 yes
+# 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

playbooks/roles/access/handlers/main.yml

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+---
+- name: Restart sshd
+  ansible.builtin.service:
+    name: sshd
+    state: restarted
+  become: true
+
+- name: Restart ssh
+  ansible.builtin.service:
+    name: ssh
+    state: restarted
+  become: true
+
+- name: Enable and start fail2ban
+  ansible.builtin.service:
+    name: fail2ban
+    state: started
+    enabled: true
+  become: true
+
+- name: Restart fail2ban
+  ansible.builtin.service:
+    name: fail2ban
+    state: restarted
+  become: true

playbooks/roles/access/tasks/main.yml

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+---
+- name: Create admin group
+  ansible.builtin.group:
+    name: admin
+    state: present
+  become: true
+
+- name: Allow admin sudo access without password
+  ansible.builtin.lineinfile:
+    dest: /etc/sudoers
+    regexp: '^%admin'
+    line: '%admin ALL=(ALL) NOPASSWD:ALL'
+    backup: true
+    validate: visudo -cf %s
+  become: true
+
+- name: Check if zsh is installed
+  ansible.builtin.stat:
+    path: /bin/zsh
+  register: access_zsh_installed
+
+- name: Create accounts
+  ansible.builtin.user:
+    name: '{{ item.key }}'
+    password: ''
+    shell: '{{ "/bin/zsh" if access_zsh_installed.stat.exists else "/bin/bash" }}'
+    group: admin
+    generate_ssh_key: false
+    state: present
+  loop: '{{ access.admin | dict2items }}'
+  become: true
+
+- name: Configure ssh keys
+  ansible.posix.authorized_key:
+    user: '{{ item.key }}'
+    key: '{{ item.value }}'
+    state: present
+  loop: '{{ access.admin | dict2items }}'
+  become: true
+
+- name: Replace default sshd_config file
+  ansible.builtin.copy:
+    src: sshd_config
+    dest: /etc/ssh/sshd_config
+    mode: '0644'
+  become: true
+  notify:
+    - Restart sshd
+    - Restart ssh
+
+- name: Install fail2ban
+  ansible.builtin.apt:
+    name: fail2ban
+    update_cache: true
+    state: present
+  become: true
+  notify: Enable and start fail2ban
+
+- name: Configure fail2ban
+  ansible.builtin.copy:
+    src: '{{ item }}'
+    dest: '/etc/fail2ban/{{ item }}'
+    owner: root
+    group: root
+    mode: '0644'
+  become: true
+  loop:
+    - fail2ban.local
+    - jail.local
+  notify: Restart fail2ban
+
+- name: Run handlers
+  ansible.builtin.meta: flush_handlers
+
+- name: Modify inventory file in order to login with current user instead
+  ansible.builtin.lineinfile:
+    path: '{{ ansible_inventory_sources[0] }}/hosts'
+    regexp: '^{{ inventory_hostname }} .*'
+    line: '{{ inventory_hostname }} ansible_host={{ ansible_host }} ansible_ssh_user={{ lookup("env", "USER") }}' # noqa yaml[line-length]
+  loop: '{{ ansible_play_hosts }}'
+  delegate_to: localhost
+
+- name: Add host to in-memory inventory
+  ansible.builtin.add_host:
+    hostname: '{{ inventory_hostname }}'
+    ansible_host: '{{ ansible_host }}'
+    ansible_ssh_user: '{{ lookup("env", "USER") }}'
+
+- name: Refresh inventory
+  ansible.builtin.meta: refresh_inventory