From 49a4ba3b9351c17dace1a9a806b40bf9ca34f900 Mon Sep 17 00:00:00 2001
From: heqnx <root@heqnx.com>
Date: Sun, 22 Jun 2025 21:44:09 +0300
Subject: added harden task

---
 main.yaml         |   1 +
 tasks/harden.yaml | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 vars/main.yaml    |   2 +
 3 files changed, 142 insertions(+)
 create mode 100644 tasks/harden.yaml

diff --git a/main.yaml b/main.yaml
index 39004b8..0e1f5eb 100644
--- a/main.yaml
+++ b/main.yaml
@@ -7,3 +7,4 @@
     - import_tasks: tasks/preflight.yaml
     - import_tasks: tasks/pve_setup.yaml
     - import_tasks: tasks/pve_configure.yaml
+    - import_tasks: tasks/harden.yaml
diff --git a/tasks/harden.yaml b/tasks/harden.yaml
new file mode 100644
index 0000000..dfccce7
--- /dev/null
+++ b/tasks/harden.yaml
@@ -0,0 +1,139 @@
+- name: clear /etc/issue and /etc/motd
+  copy:
+    content: ""
+    dest: "{{ item }}"
+  loop:
+    - /etc/issue
+    - /etc/motd
+
+- name: check if /etc/update-motd.d directory exists
+  stat:
+    path: /etc/update-motd.d
+  register: motd_dir
+
+- name: find files in /etc/update-motd.d
+  find:
+    paths: /etc/update-motd.d
+    file_type: file
+  register: motd_files
+  when: motd_dir.stat.exists
+
+- name: remove execute permissions from all files in /etc/update-motd.d
+  file:
+    path: "{{ item.path }}"
+    mode: u-x,g-x,o-x
+  loop: "{{ motd_files.files }}"
+  when: motd_dir.stat.exists
+
+- name: enforce root-only cron/at
+  file:
+    path: "{{ item }}"
+    state: touch
+    owner: root
+    group: root
+    mode: '0600'
+  loop:
+    - /etc/cron.allow
+    - /etc/at.allow
+
+- name: remove deny files for cron and at
+  file:
+    path: "{{ item }}"
+    state: absent
+  loop:
+    - /etc/cron.deny
+    - /etc/at.deny
+
+- name: backup sshd_config
+  copy:
+    src: /etc/ssh/sshd_config
+    dest: "/etc/ssh/sshd_config.bak_{{ ansible_date_time.iso8601_basic }}"
+    remote_src: true
+
+- name: harden sshd_config
+  copy:
+    dest: /etc/ssh/sshd_config
+    content: |
+      Port 22
+      Banner /etc/issue
+      UsePAM yes
+      Protocol 2
+      Subsystem sftp /usr/lib/openssh/sftp-server
+      LogLevel verbose
+      PrintMotd no
+      AcceptEnv LANG LC_*
+      MaxSessions 5
+      StrictModes yes
+      Compression no
+      MaxAuthTries 3
+      IgnoreRhosts yes
+      PrintLastLog yes
+      AddressFamily inet
+      X11Forwarding no
+      PermitRootLogin yes
+      AllowTcpForwarding yes
+      ClientAliveInterval 1200
+      AllowAgentForwarding no
+      PermitEmptyPasswords no
+      ClientAliveCountMax 0
+      GSSAPIAuthentication no
+      KerberosAuthentication no
+      IgnoreUserKnownHosts yes
+      PermitUserEnvironment no
+      ChallengeResponseAuthentication no
+      MACs hmac-sha2-512,hmac-sha2-256
+      Ciphers aes128-ctr,aes192-ctr,aes256-ctr
+
+- name: regenerate SSH host keys
+  shell: |
+    rm -f /etc/ssh/ssh_host_*key*
+    ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ""
+    ssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -N ""
+  args:
+    creates: /etc/ssh/ssh_host_ed25519_key
+
+- name: restart ssh
+  systemd:
+    name: ssh
+    state: restarted
+    enabled: true
+  when: ansible_service_mgr == 'systemd'
+
+- name: enable unattended-upgrades
+  shell: dpkg-reconfigure --priority=low unattended-upgrades
+  args:
+    creates: /etc/apt/apt.conf.d/50unattended-upgrades
+
+- name: restart unattended-upgrades
+  systemd:
+    name: unattended-upgrades
+    state: restarted
+    enabled: true
+  when: ansible_service_mgr == 'systemd'
+
+- name: disable ipv6 in grub
+  lineinfile:
+    path: /etc/default/grub
+    regexp: '^GRUB_CMDLINE_LINUX='
+    line: 'GRUB_CMDLINE_LINUX="ipv6.disable=1"'
+
+- name: update grub
+  command: update-grub
+
+- name: allow ssh port and enable ufw
+  ufw:
+    rule: allow
+    port: 22
+    proto: tcp
+
+- name: enable ufw
+  ufw:
+    state: enabled
+    policy: deny
+
+- name: restart ufw
+  systemd:
+    name: ufw
+    state: restarted
+    enabled: true
+  when: ansible_service_mgr == 'systemd'
diff --git a/vars/main.yaml b/vars/main.yaml
index da2b829..5836979 100644
--- a/vars/main.yaml
+++ b/vars/main.yaml
@@ -3,6 +3,8 @@ apt_packages:
   - ca-certificates
   - iptables-persistent
   - proxmox-default-kernel
+  - ufw
+  - unattended-upgrades
 
 pve_packages:
   - proxmox-ve
-- 
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