ansible-hardening/tasks/rhel7stig/auth.yml

---
# Copyright 2016, Rackspace US, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

- name: Get a list of users on the system to use throughout the auth tasks
  action: get_users
  register: user_list
  check_mode: no
  tags:
    - always

- name: Check if /etc/security/pwquality.conf exists
  stat:
    path: /etc/security/pwquality.conf
  check_mode: no
  register: pwquality_config_check
  tags:
    - always

- name: Set password quality requirements
  blockinfile:
    dest: /etc/security/pwquality.conf
    backup: yes
    insertbefore: EOF
    marker: "# {mark} Added by openstack-ansible-security role"
    state: present
    block: "{{ lookup('template', 'pwquality.conf.j2') }}"
  when:
    - pwquality_config_check.stat.exists
  tags:
    - auth
    - medium
    - RHEL-07-010090
    - RHEL-07-010100
    - RHEL-07-010110
    - RHEL-07-010120
    - RHEL-07-010130
    - RHEL-07-010140
    - RHEL-07-010150
    - RHEL-07-010160
    - RHEL-07-010250

- name: Check for SHA512 password storage in PAM
  command: "grep pam_unix.so {{ pam_password_file }}"
  register: password_sha512_check
  changed_when: False
  check_mode: no
  tags:
    - always

- name: RHEL-07-010170 - The PAM system service must be configured to store only encrypted representations of passwords.
  debug:
    msg: >
      PAM is not using SHA512 for password storage. This is a security issue.
  when:
    - password_sha512_check is defined
    - "'sha512' not in password_sha512_check.stdout"
  tags:
    - auth
    - medium
    - RHEL-07-010170

- name: Configure shadow-utils configuration
  lineinfile:
    dest: /etc/login.defs
    regexp: "^{{ item.parameter }}"
    line: "{{ item.parameter }} {{ item.value }}"
    state: present
  when:
    - item.value != ''
  with_items: "{{ shadow_utils_rhel7 }}"
  tags:
    - auth
    - medium
    - RHEL-07-010180
    - RHEL-07-010200
    - RHEL-07-010220
    - RHEL-07-010420
    - RHEL-07-020230
    - RHEL-07-020630

- name: RHEL-07-010190 - User and group account administration utilities must be configured to store only encrypted representations of passwords.
  ini_file:
    dest: /etc/libuser.conf
    section: defaults
    option: crypt_style
    value: sha512
    backup: yes
  when:
    - security_libuser_crypt_style_sha512 | bool
    - ansible_os_family | lower == 'redhat'
  tags:
    - auth
    - medium
    - RHEL-07-010190

- name: Get all user accounts with a password lifetime limit under 24 hours
  shell: "awk -F: '$4 < 1 {print $1}' /etc/shadow"
  check_mode: no
  changed_when: False
  register: password_lifetime_check
  tags:
    - auth
    - medium
    - RHEL-07-010210
    - skip_ansible_lint

- name: RHEL-07-010210 - Passwords must be restricted to a 24 hours/1 day minimum lifetime.
  debug:
    msg: |
      Accounts were found with a minimum password lifetime limit under 24 hours:
      {{ password_lifetime_check.stdout_lines | join(', ') }}
  when:
    - password_lifetime_check.stdout_lines is defined
  tags:
    - auth
    - medium
    - RHEL-07-010210

- name: RHEL-07-010240 - Passwords must be prohibited from reuse for a minimum of five generations.
  lineinfile:
    dest: "{{ pam_password_file }}"
    regexp: '^(password\s+[a-z0-9\=\[\] ]+\s+pam_unix\.so.+?)\s+(?:remember=\d+)?$'
    line: '\1 remember={{ security_password_remember_password }}'
    backrefs: yes
    state: present
  when:
    - security_password_remember_password is defined
  tags:
    - auth
    - medium
    - RHEL-07-010240

- name: RHEL-07-010230 - Existing passwords must be restricted to a 60-day maximum lifetime.
  debug:
    msg: |
      The following user accounts have an existing password with a lifetime of
      greater than 60 days:
      {%- for user in user_list.users %}
      {% if user['shadow']['max_days'] > 60 %}
          {{ user['name'] }} has an expiration of {{ user['shadow']['max_days'] }} days
      {% endif %}
      {% endfor %}
  tags:
    - auth
    - medium
    - RHEL-07-010230

- name: RHEL-07-010260 - The system must not have accounts configured with blank or null passwords
  lineinfile:
    dest: "{{ pam_auth_file }}"
    state: present
    regexp: "^(.*)nullok_secure(.*)$"
    line: '\1\2'
    backup: yes
    backrefs: yes
  when:
    - ansible_os_family == 'Debian'
    - security_disallow_blank_password_login | bool
  tags:
    - auth
    - high
    - RHEL-07-010260

- name: RHEL-07-010260 - The system must not have accounts configured with blank or null passwords
  lineinfile:
    dest: "{{ pam_auth_file }}"
    state: present
    regexp: "^({{ item }}.*sufficient.*)nullok(.*)$"
    line: '\1\2'
    backup: yes
    backrefs: yes
  with_items:
    - auth
    - password
  when:
    - ansible_os_family == 'RedHat'
    - security_disallow_blank_password_login | bool
  tags:
    - auth
    - high
    - RHEL-07-010260

- name: RHEL-07-010280 - The operating system must disable account identifiers if the password expires.
  lineinfile:
    dest: /etc/default/useradd
    regexp: '^[#\s]*INACTIVE'
    line: 'INACTIVE=0'
  when:
    - security_disable_account_if_password_expires | bool
  tags:
    - auth
    - medium
    - RHEL-07-010280

- name: RHEL-07-010371 - If three unsuccessful logon attempts within 15 minutes occur the associated account must be locked.
  blockinfile:
    dest: pam_password_file
    state: present
    marker: "# {mark} MANAGED BY OPENSTACK-ANSIBLE-SECURITY"
    insertbefore: EOF
    block: "{{ lookup('template', 'pam_faillock.j2') }}"
  when:
    - ansible_os_family | lower == 'redhat'
    - security_pam_faillock_enable | bool
  tags:
    - auth
    - medium
    - RHEL-07-010371
    - RHEL-07-010372
    - RHEL-07-010373

- name: Check for 'nopasswd' in sudoers files
  shell: grep -ir nopasswd /etc/sudoers /etc/sudoers.d/ || echo 'not found'
  register: sudoers_nopasswd_check
  changed_when: False
  tags:
    - auth
    - medium
    - RHEL-07-010380

- name: RHEL-07-010380 - Users must provide a password for privilege escalation.
  debug:
    msg: >
      The 'NOPASSWD' directive was found in the sudoers configuration files.
      Remove the directive to ensure that all users must provide a password to
      run commands as the root user.
  when:
    - not sudoers_nopasswd_check | skipped
    - sudoers_nopasswd_check.stdout != 'not found'
  tags:
    - auth
    - medium
    - RHEL-07-010380
    - skip_ansible_lint

- name: Check for '!authenticate' in sudoers files
  shell: grep -ir '\!authenticate' /etc/sudoers /etc/sudoers.d/ || echo 'not found'
  register: sudoers_authenticate_check
  changed_when: False
  tags:
    - auth
    - medium
    - RHEL-07-010381

- name: RHEL-07-010381 - Users must re-authenticate for privilege escalation.
  debug:
    msg: >
      The '!authenticate' directive was found in the sudoers configuration
      files. Remove the directive to ensure that all users must provide a
      password to run commands as the root user each time they use sudo.
  when:
    - not sudoers_authenticate_check | skipped
    - sudoers_authenticate_check.stdout != 'not found'
  tags:
    - auth
    - medium
    - RHEL-07-010381
    - skip_ansible_lint

- name: Check if sssd.conf exists
  stat:
    path: /etc/sssd/sssd.conf
  register: sssd_conf_check
  check_mode: no
  tags:
    - always

- name: RHEL-07-010400 - The operating system must prohibit the use of cached nss authenticators after one day.
  ini_file:
    dest: /etc/sssd/sssd.conf
    section: nss
    option: memcache_timeout
    value: "{{ security_nss_cached_authenticator_timeout }}"
    backup: yes
  when:
    - sssd_conf_check.stat.exists
    - security_nss_cached_authenticator_timeout is defined
  tags:
    - auth
    - medium
    - RHEL-07-010400

- name: RHEL-07-010401 - The operating system must prohibit the use of cached PAM authenticators after one day.
  ini_file:
    dest: /etc/sssd/sssd.conf
    section: pam
    option: offline_credentials_expiration
    value: "{{ security_pam_offline_credentials_expiration_days }}"
    backup: yes
  when:
    - sssd_conf_check.stat.exists
    - security_pam_offline_credentials_expiration_days is defined
  tags:
    - auth
    - medium
    - RHEL-07-010401
    - RHEL-07-010402

- name: Get all accounts with UID 0
  shell: "awk -F: '$3 == 0 {print $1}' /etc/passwd"
  changed_when: False
  check_mode: no
  register: root_user_check
  tags:
    - auth
    - high
    - RHEL-07-020310
    - skip_ansible_lint

- name: Check for groups in /etc/passwd that are not in /etc/group
  debug:
    msg: >
      The following users have GIDs in /etc/passwd that do not exist in /etc/group:
      {{ user_list.users | selectattr('group', 'equalto', False) | map(attribute='name') | join(', ') }}
  when:
    - user_list is defined
    - user_list.users | selectattr('group', 'equalto', False) | list | length > 0
  tags:
    - auth
    - low
    - RHEL-07-020300

- name: RHEL-07-020310 - The root account must be the only account having unrestricted access to the system
  fail:
    msg: |
      Only the 'root' user should have UID 0. Other users were found:
      {{ root_user_check.stdout_lines | join(', ') }}"
  when:
    - root_user_check.stdout != 'root'
  tags:
    - auth
    - high
    - RHEL-07-020310

- name: RHEL-07-020620 - All local interactive users must have a home directory assigned in the /etc/passwd file.
  debug:
    msg: |
      The following users do not have a home directory assigned:
      {{ user_list.users | selectattr('dir', 'equalto', '') | map(attribute='name') | join(', ') }}
  when:
    - user_list is defined
    - user_list.users | selectattr('dir', 'equalto', '') | map(attribute='name') | list | length > 0
  tags:
    - auth
    - medium
    - RHEL-07-020620

- name: Check each user to see if its home directory exists on the filesystem
  stat:
    path: "{{ item['dir'] }}"
  when:
    - item['dir'] != ''
  with_items: "{{ user_list.users }}"
  register: home_directory_checks
  tags:
    - auth
    - medium
    - RHEL-07-020640

- name: RHEL-07-020640 - All local interactive user home directories defined in the /etc/passwd file must exist.
  debug:
    msg: |
      These users have a home directory assigned, but the directory does not exist:
      {% for check in home_directory_checks.results %}
      {% if not check.stat.exists %}
      {{ check.item.name }} ({{ check.item.dir }} does not exist)
      {% endif %}
      {% endfor %}
  when:
    - home_directory_checks.results | selectattr('stat.exists', 'sameas', false) | list | length > 0
  tags:
    - auth
    - medium
    - RHEL-07-020640