# platform = multi_platform_rhel,multi_platform_fedora,multi_platform_ol,multi_platform_almalinux,multi_platform_rhv,multi_platform_sle,multi_platform_slmicro,multi_platform_ubuntu,multi_platform_debian
# reboot = true
# strategy = restrict
# complexity = low
# disruption = low
- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - audit_rules_dac_modification_umount2
  - low_complexity
  - low_disruption
  - medium_severity
  - reboot_required
  - restrict_strategy

- name: Set architecture for audit umount2 tasks
  ansible.builtin.set_fact:
    audit_arch: b64
  when:
  - '"auditd" in ansible_facts.packages'
  - '"linux-base" in ansible_facts.packages'
  - ansible_architecture == "aarch64" or ansible_architecture == "ppc64" or ansible_architecture
    == "ppc64le" or ansible_architecture == "s390x" or ansible_architecture == "x86_64"
  tags:
  - audit_rules_dac_modification_umount2
  - low_complexity
  - low_disruption
  - medium_severity
  - reboot_required
  - restrict_strategy

- name: Perform remediation of Audit rules for umount2 for 32bit platform
  block:

  - name: Declare list of syscalls
    ansible.builtin.set_fact:
      syscalls:
      - umount2
      syscall_grouping: []

  - name: Check existence of umount2 in /etc/audit/rules.d/
    ansible.builtin.find:
      paths: /etc/audit/rules.d
      contains: -a always,exit -F arch=b32(( -S |,)\w+)*(( -S |,){{ item }})+(( -S
        |,)\w+)* -F auid>=1000 -F auid!=unset (-k\s+|-F\s+key=)\S+\s*$
      patterns: '*.rules'
    register: find_command
    loop: '{{ (syscall_grouping + syscalls) | unique }}'

  - name: Reset syscalls found per file
    ansible.builtin.set_fact:
      syscalls_per_file: {}
      found_paths_dict: {}

  - name: Declare syscalls found per file
    ansible.builtin.set_fact: syscalls_per_file="{{ syscalls_per_file | combine( {item.files[0].path
      :[item.item] + syscalls_per_file.get(item.files[0].path, []) } ) }}"
    loop: '{{ find_command.results | selectattr(''matched'') | list }}'

  - name: Declare files where syscalls were found
    ansible.builtin.set_fact: found_paths="{{ find_command.results | map(attribute='files')
      | flatten | map(attribute='path') | list }}"

  - name: Count occurrences of syscalls in paths
    ansible.builtin.set_fact: found_paths_dict="{{ found_paths_dict | combine({ item:1+found_paths_dict.get(item,
      0) }) }}"
    loop: '{{ find_command.results | map(attribute=''files'') | flatten | map(attribute=''path'')
      | list }}'

  - name: Get path with most syscalls
    ansible.builtin.set_fact: audit_file="{{ (found_paths_dict | dict2items() | sort(attribute='value')
      | last).key }}"
    when: found_paths | length >= 1

  - name: No file with syscall found, set path to /etc/audit/rules.d/perm_mod.rules
    ansible.builtin.set_fact: audit_file="/etc/audit/rules.d/perm_mod.rules"
    when: found_paths | length == 0

  - name: Declare found syscalls
    ansible.builtin.set_fact: syscalls_found="{{ find_command.results | selectattr('matched')
      | map(attribute='item') | list }}"

  - name: Declare missing syscalls
    ansible.builtin.set_fact: missing_syscalls="{{ syscalls | difference(syscalls_found)
      }}"

  - name: Replace the audit rule in {{ audit_file }}
    ansible.builtin.lineinfile:
      path: '{{ audit_file }}'
      regexp: (-a always,exit -F arch=b32)(?=.*(?:(?:-S |,)(?:{{ syscalls_per_file[audit_file]
        | join("|") }}))\b)((?:( -S |,)\w+)+)( -F auid>=1000 -F auid!=unset (?:-k
        |-F key=)\w+)
      line: \1\2\3{{ missing_syscalls | join("\3") }}\4
      backrefs: true
      state: present
      mode: g-rwx,o-rwx
    when: syscalls_found | length > 0 and missing_syscalls | length > 0

  - name: Add the audit rule to {{ audit_file }}
    ansible.builtin.lineinfile:
      path: '{{ audit_file }}'
      line: -a always,exit -F arch=b32 -S {{ syscalls | join(',') }} -F auid>=1000
        -F auid!=unset -F key=perm_mod
      create: true
      mode: g-rwx,o-rwx
      state: present
    when: syscalls_found | length == 0

  - name: Declare list of syscalls
    ansible.builtin.set_fact:
      syscalls:
      - umount2
      syscall_grouping: []

  - name: Check existence of umount2 in /etc/audit/audit.rules
    ansible.builtin.find:
      paths: /etc/audit
      contains: -a always,exit -F arch=b32(( -S |,)\w+)*(( -S |,){{ item }})+(( -S
        |,)\w+)* -F auid>=1000 -F auid!=unset (-k\s+|-F\s+key=)\S+\s*$
      patterns: audit.rules
    register: find_command
    loop: '{{ (syscall_grouping + syscalls) | unique }}'

  - name: Set path to /etc/audit/audit.rules
    ansible.builtin.set_fact: audit_file="/etc/audit/audit.rules"

  - name: Declare found syscalls
    ansible.builtin.set_fact: syscalls_found="{{ find_command.results | selectattr('matched')
      | map(attribute='item') | list }}"

  - name: Declare missing syscalls
    ansible.builtin.set_fact: missing_syscalls="{{ syscalls | difference(syscalls_found)
      }}"

  - name: Replace the audit rule in {{ audit_file }}
    ansible.builtin.lineinfile:
      path: '{{ audit_file }}'
      regexp: (-a always,exit -F arch=b32)(?=.*(?:(?:-S |,)(?:{{ syscalls_found |
        join("|") }}))\b)((?:( -S |,)\w+)+)( -F auid>=1000 -F auid!=unset (?:-k |-F
        key=)\w+)
      line: \1\2\3{{ missing_syscalls | join("\3") }}\4
      backrefs: true
      state: present
      mode: g-rwx,o-rwx
    when: syscalls_found | length > 0 and missing_syscalls | length > 0

  - name: Add the audit rule to {{ audit_file }}
    ansible.builtin.lineinfile:
      path: '{{ audit_file }}'
      line: -a always,exit -F arch=b32 -S {{ syscalls | join(',') }} -F auid>=1000
        -F auid!=unset -F key=perm_mod
      create: true
      mode: g-rwx,o-rwx
      state: present
    when: syscalls_found | length == 0
  when:
  - '"auditd" in ansible_facts.packages'
  - '"linux-base" in ansible_facts.packages'
  tags:
  - audit_rules_dac_modification_umount2
  - low_complexity
  - low_disruption
  - medium_severity
  - reboot_required
  - restrict_strategy

- name: Perform remediation of Audit rules for umount2 for 64bit platform
  block:

  - name: Declare list of syscalls
    ansible.builtin.set_fact:
      syscalls:
      - umount2
      syscall_grouping: []

  - name: Check existence of umount2 in /etc/audit/rules.d/
    ansible.builtin.find:
      paths: /etc/audit/rules.d
      contains: -a always,exit -F arch=b64(( -S |,)\w+)*(( -S |,){{ item }})+(( -S
        |,)\w+)* -F auid>=1000 -F auid!=unset (-k\s+|-F\s+key=)\S+\s*$
      patterns: '*.rules'
    register: find_command
    loop: '{{ (syscall_grouping + syscalls) | unique }}'

  - name: Reset syscalls found per file
    ansible.builtin.set_fact:
      syscalls_per_file: {}
      found_paths_dict: {}

  - name: Declare syscalls found per file
    ansible.builtin.set_fact: syscalls_per_file="{{ syscalls_per_file | combine( {item.files[0].path
      :[item.item] + syscalls_per_file.get(item.files[0].path, []) } ) }}"
    loop: '{{ find_command.results | selectattr(''matched'') | list }}'

  - name: Declare files where syscalls were found
    ansible.builtin.set_fact: found_paths="{{ find_command.results | map(attribute='files')
      | flatten | map(attribute='path') | list }}"

  - name: Count occurrences of syscalls in paths
    ansible.builtin.set_fact: found_paths_dict="{{ found_paths_dict | combine({ item:1+found_paths_dict.get(item,
      0) }) }}"
    loop: '{{ find_command.results | map(attribute=''files'') | flatten | map(attribute=''path'')
      | list }}'

  - name: Get path with most syscalls
    ansible.builtin.set_fact: audit_file="{{ (found_paths_dict | dict2items() | sort(attribute='value')
      | last).key }}"
    when: found_paths | length >= 1

  - name: No file with syscall found, set path to /etc/audit/rules.d/perm_mod.rules
    ansible.builtin.set_fact: audit_file="/etc/audit/rules.d/perm_mod.rules"
    when: found_paths | length == 0

  - name: Declare found syscalls
    ansible.builtin.set_fact: syscalls_found="{{ find_command.results | selectattr('matched')
      | map(attribute='item') | list }}"

  - name: Declare missing syscalls
    ansible.builtin.set_fact: missing_syscalls="{{ syscalls | difference(syscalls_found)
      }}"

  - name: Replace the audit rule in {{ audit_file }}
    ansible.builtin.lineinfile:
      path: '{{ audit_file }}'
      regexp: (-a always,exit -F arch=b64)(?=.*(?:(?:-S |,)(?:{{ syscalls_per_file[audit_file]
        | join("|") }}))\b)((?:( -S |,)\w+)+)( -F auid>=1000 -F auid!=unset (?:-k
        |-F key=)\w+)
      line: \1\2\3{{ missing_syscalls | join("\3") }}\4
      backrefs: true
      state: present
      mode: g-rwx,o-rwx
    when: syscalls_found | length > 0 and missing_syscalls | length > 0

  - name: Add the audit rule to {{ audit_file }}
    ansible.builtin.lineinfile:
      path: '{{ audit_file }}'
      line: -a always,exit -F arch=b64 -S {{ syscalls | join(',') }} -F auid>=1000
        -F auid!=unset -F key=perm_mod
      create: true
      mode: g-rwx,o-rwx
      state: present
    when: syscalls_found | length == 0

  - name: Declare list of syscalls
    ansible.builtin.set_fact:
      syscalls:
      - umount2
      syscall_grouping: []

  - name: Check existence of umount2 in /etc/audit/audit.rules
    ansible.builtin.find:
      paths: /etc/audit
      contains: -a always,exit -F arch=b64(( -S |,)\w+)*(( -S |,){{ item }})+(( -S
        |,)\w+)* -F auid>=1000 -F auid!=unset (-k\s+|-F\s+key=)\S+\s*$
      patterns: audit.rules
    register: find_command
    loop: '{{ (syscall_grouping + syscalls) | unique }}'

  - name: Set path to /etc/audit/audit.rules
    ansible.builtin.set_fact: audit_file="/etc/audit/audit.rules"

  - name: Declare found syscalls
    ansible.builtin.set_fact: syscalls_found="{{ find_command.results | selectattr('matched')
      | map(attribute='item') | list }}"

  - name: Declare missing syscalls
    ansible.builtin.set_fact: missing_syscalls="{{ syscalls | difference(syscalls_found)
      }}"

  - name: Replace the audit rule in {{ audit_file }}
    ansible.builtin.lineinfile:
      path: '{{ audit_file }}'
      regexp: (-a always,exit -F arch=b64)(?=.*(?:(?:-S |,)(?:{{ syscalls_found |
        join("|") }}))\b)((?:( -S |,)\w+)+)( -F auid>=1000 -F auid!=unset (?:-k |-F
        key=)\w+)
      line: \1\2\3{{ missing_syscalls | join("\3") }}\4
      backrefs: true
      state: present
      mode: g-rwx,o-rwx
    when: syscalls_found | length > 0 and missing_syscalls | length > 0

  - name: Add the audit rule to {{ audit_file }}
    ansible.builtin.lineinfile:
      path: '{{ audit_file }}'
      line: -a always,exit -F arch=b64 -S {{ syscalls | join(',') }} -F auid>=1000
        -F auid!=unset -F key=perm_mod
      create: true
      mode: g-rwx,o-rwx
      state: present
    when: syscalls_found | length == 0
  when:
  - '"auditd" in ansible_facts.packages'
  - '"linux-base" in ansible_facts.packages'
  - audit_arch == "b64"
  tags:
  - audit_rules_dac_modification_umount2
  - low_complexity
  - low_disruption
  - medium_severity
  - reboot_required
  - restrict_strategy
