RHEL9-CIS/tasks/section_5/cis_5.1.x.yml

---

- name: "5.1.1 | PATCH | Ensure permissions on /etc/ssh/sshd_config are configured"
  when: rhel9cis_rule_5_1_1
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - permissions
    - rule_5.1.1
    - NIST800-53R5_AC-3
    - NIST800-53R5_MP-2
  ansible.builtin.file:
    path: "/etc/ssh/sshd_config"
    owner: root
    group: root
    mode: 'go-rwx'

- name: "5.1.2 | PATCH | Ensure permissions on SSH private host key files are configured"
  when: rhel9cis_rule_5_1_2
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - permissions
    - rule_5.1.2
    - NIST800-53R5_AC-3
    - NIST800-53R5_MP-2
  block:
    - name: "5.1.2 | AUDIT | Ensure permissions on SSH private host key files are configured | Find the SSH private host keys"
      ansible.builtin.find:
        paths: /etc/ssh
        patterns: 'ssh_host_*_key'
        recurse: true
        file_type: any
      register: discovered_ssh_private_host_key

    - name: "5.1.2 | PATCH | Ensure permissions on SSH private host key files are configured | Set permissions on SSH private host keys"
      ansible.builtin.file:
        path: "{{ item.path }}"
        owner: root
        group: "{{ 'ssh_keys' if (item.gr_name == 'ssh_keys') else 'root' }}"
        mode: "{{ 'u-x,g-wx,o-rwx' if (item.gr_name == 'ssh_keys') else 'u-x,go-rwx' }}"
      loop: "{{ discovered_ssh_private_host_key.files }}"
      loop_control:
        label: "{{ item.path }}"

- name: "5.1.3 | PATCH | Ensure permissions on SSH public host key files are configured"
  when: rhel9cis_rule_5_1_3
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.3
    - NIST800-53R5_AC-3
    - NIST800-53R5_MP-2
  block:
    - name: "5.1.3 | AUDIT | Ensure permissions on SSH public host key files are configured | Find the SSH public host keys"
      ansible.builtin.find:
        paths: /etc/ssh
        patterns: 'ssh_host_*_key.pub'
        recurse: true
        file_type: any
      register: discovered_ssh_public_host_key

    - name: "5.1.3 | PATCH | Ensure permissions on SSH public host key files are configured | Set permissions on SSH public host keys"
      ansible.builtin.file:
        path: "{{ item.path }}"
        owner: root
        group: root
        mode: 'u-x,go-wx'
      loop: "{{ discovered_ssh_public_host_key.files }}"
      loop_control:
        label: "{{ item.path }}"

- name: "5.1.4 | PATCH | Ensure sshd Ciphers are configured"
  when:
    - rhel9cis_rule_5_1_4
    - "'NO-SSHWEAKCIPHERS' not in rhel9cis_crypto_policy_module"
    - rhel9cis_crypto_policy_ansiblemanaged
  tags:
    - level1-server
    - level1-workstation
    - automated
    - patch
    - crypto
    - rule_5.1.4
    - NIST800-53R5_SC-8
  block:
    - name: "5.1.4 | PATCH | Ensure sshd Ciphers are configured | Add submodule exclusion"
      ansible.builtin.template:
        src: etc/crypto-policies/policies/modules/NO-SSHWEAKCIPHERS.pmod.j2
        dest: /etc/crypto-policies/policies/modules/NO-SSHWEAKCIPHERS.pmod
        owner: root
        group: root
        mode: 'g-wx,o-rwx'
      notify:
        - Update Crypto Policy
        - Set Crypto Policy

    - name: "5.1.4 | PATCH | Ensure sshd Ciphers are configured | submodule to crypto policy modules"
      ansible.builtin.set_fact:
        rhel9cis_crypto_policy_module: "{{ rhel9cis_crypto_policy_module + ':NO-SSHWEAKCIPHERS' }}"

- name: "5.1.5 | PATCH | Ensure sshd KexAlgorithms is configured"
  when:
    - rhel9cis_rule_5_1_5
    - "'NO-SHA1' not in rhel9cis_crypto_policy_module"
    - rhel9cis_crypto_policy_ansiblemanaged
  tags:
    - level1-server
    - level1-workstation
    - automated
    - patch
    - crypto
    - rule_5.1.5
    - NIST800-53R5_SC-6
  block:
    - name: "5.1.5 | PATCH | Ensure sshd KexAlgorithms is configured | Add submodule exclusion"
      ansible.builtin.template:
        src: etc/crypto-policies/policies/modules/NO-SHA1.pmod.j2
        dest: /etc/crypto-policies/policies/modules/NO-SHA1.pmod
        owner: root
        group: root
        mode: 'g-wx,o-rwx'
      notify:
        - Update Crypto Policy
        - Set Crypto Policy

    - name: "5.1.5 | PATCH | Ensure sshd KexAlgorithms is configured | submodule to crypto policy modules"
      ansible.builtin.set_fact:
        rhel9cis_crypto_policy_module: "{{ rhel9cis_crypto_policy_module + ':NO-SHA1' }}"

- name: "5.1.6 | PATCH | Ensure sshd KexAlgorithms is configured"
  when:
    - rhel9cis_rule_5_1_6
    - "'NO-SSHWEAKMACS' not in rhel9cis_crypto_policy_module"
    - rhel9cis_crypto_policy_ansiblemanaged
  tags:
    - level1-server
    - level1-workstation
    - automated
    - patch
    - crypto
    - rule_5.1.6
    - NIST800-53R5_SC-6
  block:
    - name: "5.1.6 | PATCH | Ensure sshd KexAlgorithms is configured | Add submodule exclusion"
      ansible.builtin.template:
        src: etc/crypto-policies/policies/modules/NO-SSHWEAKMACS.pmod.j2
        dest: /etc/crypto-policies/policies/modules/NO-SSHWEAKMACS.pmod
        owner: root
        group: root
        mode: 'g-wx,o-rwx'
      notify:
        - Update Crypto Policy
        - Set Crypto Policy

    - name: "5.1.6 | PATCH | Ensure sshd KexAlgorithms is configured | submodule to crypto policy modules"
      ansible.builtin.set_fact:
        rhel9cis_crypto_policy_module: "{{ rhel9cis_crypto_policy_module + ':' + 'NO-SSHWEAKMACS' }}"

- name: "5.1.7 | PATCH | Ensure sshd access is configured"
  when: rhel9cis_rule_5_1_7
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.7
    - NIST800-53R5_AC-3
    - NIST800-53R5_MP-2
  block:
    - name: "5.1.7 | PATCH | Ensure sshd access is configured | Add line to sshd_config for allowusers"
      when: "rhel9cis_sshd_allowusers | length > 0"
      ansible.builtin.lineinfile:
        path: "{{ rhel9cis_sshd_config_file }}"
        regexp: "^AllowUsers"
        line: "AllowUsers {{ rhel9cis_sshd_allowusers }}"
        validate: sshd -t -f %s
      notify: Restart sshd

    - name: "5.1.7 | PATCH | Ensure sshd access is configured | Add line to sshd_config for allowgroups"
      when: "rhel9cis_sshd_allowgroups | length > 0"
      ansible.builtin.lineinfile:
        path: "{{ rhel9cis_sshd_config_file }}"
        regexp: "^AllowGroups"
        line: "AllowGroups {{ rhel9cis_sshd_allowgroups }}"
        validate: sshd -t -f %s
      notify: Restart sshd

    - name: "5.1.7 | PATCH | Ensure sshd access is configured | Add line to sshd_config for denyusers"
      when: "rhel9cis_sshd_denyusers | length > 0"
      ansible.builtin.lineinfile:
        path: "{{ rhel9cis_sshd_config_file }}"
        regexp: "^DenyUsers"
        line: "DenyUsers {{ rhel9cis_sshd_denyusers }}"
        insertbefore: "^Match"
        firstmatch: true
        validate: sshd -t -f %s
      notify: Restart sshd

    - name: "5.1.7 | PATCH | Ensure sshd access is configured | Add line to sshd_config for denygroups"
      when: "rhel9cis_sshd_denygroups | length > 0"
      ansible.builtin.lineinfile:
        path: "{{ rhel9cis_sshd_config_file }}"
        regexp: "^DenyGroups"
        line: "DenyGroups {{ rhel9cis_sshd_denygroups }}"
        validate: sshd -t -f %s
      notify: Restart sshd

- name: "5.1.8 | PATCH | Ensure sshd Banner is configured"
  when: rhel9cis_rule_5_1_8
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.8
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: '^Banner'
    line: 'Banner /etc/issue.net'

- name: "5.1.9 | PATCH | Ensure sshd ClientAliveInterval and ClientAliveCountMax are configured"
  when: rhel9cis_rule_5_1_9
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.9
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  block:
    - name: "5.1.9 | PATCH | Ensure sshd ClientAliveInterval and ClientAliveCountMax are configured | Add line in sshd_config for ClientAliveInterval"
      ansible.builtin.lineinfile:
        path: "{{ rhel9cis_sshd_config_file }}"
        regexp: '^ClientAliveInterval'
        line: "ClientAliveInterval {{ rhel9cis_sshd_clientaliveinterval }}"
        validate: sshd -t -f %s
      notify: Restart sshd

    - name: "5.1.9 | PATCH | Ensure sshd ClientAliveInterval and ClientAliveCountMax are configured | Ensure SSH ClientAliveCountMax set to <= 3"
      ansible.builtin.lineinfile:
        path: "{{ rhel9cis_sshd_config_file }}"
        regexp: '^ClientAliveCountMax'
        line: "ClientAliveCountMax {{ rhel9cis_sshd_clientalivecountmax }}"
        validate: sshd -t -f %s
      notify: Restart sshd

- name: "5.1.10 | PATCH | Ensure sshd DisableForwarding is enabled"
  when: rhel9cis_rule_5_1_10
  tags:
    - level2-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.10
    - NIST800-53R5_CM-7
  block:
    - name: "5.1.10 | PATCH | Ensure sshd DisableForwarding is enabled | config file"
      ansible.builtin.lineinfile:
        path: "{{ rhel9cis_sshd_config_file }}"
        regexp: ^(#|)\s*DisableForwarding
        line: 'DisableForwarding yes'
        validate: sshd -t -f %s
      notify: Restart sshd

    - name: "5.1.10 | PATCH | Ensure sshd DisableForwarding is enabled | override"
      when: prelim_sshd_50_redhat_file.stat.exists
      ansible.builtin.lineinfile:
        path: /etc/ssh/sshd_config.d/50-redhat.conf
        regexp: (?i)^(#|)\s*X11Forwarding
        line: 'X11Forwarding {{ rhel9cis_sshd_x11forwarding }}'
        validate: sshd -t -f %s
      notify: Restart sshd

- name: "5.1.11 | PATCH | Ensure sshd GSSAPIAuthentication is disabled"
  when: rhel9cis_rule_5_1_11
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.11
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  block:
    - name: "5.1.11 | PATCH | Ensure sshd GSSAPIAuthentication is disabled | redhat file"
      when: prelim_sshd_50_redhat_file.stat.exists
      ansible.builtin.lineinfile:
        path: /etc/ssh/sshd_config.d/50-redhat.conf
        regexp: (?i)^(#|)\s*GSSAPIAuthentication
        line: GSSAPIAuthentication no
        validate: sshd -t -f %s
      notify: Restart sshd

    - name: "5.1.11 | PATCH | Ensure sshd GSSAPIAuthentication is disabled | ssh config"
      ansible.builtin.lineinfile:
        path: "{{ rhel9cis_sshd_config_file }}"
        regexp: (?i)^(#|)\s*GSSAPIAuthentication
        line: GSSAPIAuthentication no
        validate: sshd -t -f %s
      notify: Restart sshd

- name: "5.1.12 | PATCH | Ensure sshd HostbasedAuthentication is disabled"
  when: rhel9cis_rule_5_1_12
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.12
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: (?i)^(#|)\s*HostbasedAuthentication
    line: 'HostbasedAuthentication no'
    validate: sshd -t -f %s
  notify: Restart sshd

- name: "5.1.13 | PATCH | Ensure sshd IgnoreRhosts is enabled"
  when: rhel9cis_rule_5_1_13
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.13
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: (?i)^(#|)\s*IgnoreRhosts
    line: 'IgnoreRhosts yes'
    insertbefore: "^Match"
    firstmatch: true
    validate: sshd -t -f %s
  notify: Restart sshd

- name: "5.1.14 | PATCH | Ensure sshd LoginGraceTime is set to one minute or less"
  when: rhel9cis_rule_5_1_14
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.14
    - NIST800-53R5_CM-6
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: (?i)^(#|)\s*LoginGraceTime
    line: "LoginGraceTime {{ rhel9cis_sshd_logingracetime }}"
    insertbefore: "^Match"
    firstmatch: true
    validate: sshd -t -f %s
  notify: Restart sshd

- name: "5.1.15 | PATCH | Ensure sshd LogLevel is appropriate"
  when: rhel9cis_rule_5_1_15
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.15
    - NIST800-53R5_AU-3
    - NIST800-53R5_AU-12
    - NIST800-53R5_SI-5
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: (?i)^(#|)\s*LogLevel
    line: 'LogLevel {{ rhel9cis_ssh_loglevel }}'
    insertbefore: "^Match"
    firstmatch: true
    validate: sshd -t -f %s
  notify: Restart sshd

- name: "5.1.16 | PATCH | Ensure sshd MaxAuthTries is set to 4 or less"
  when: rhel9cis_rule_5_1_16
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.16
    - NIST800-53R5_AU-3
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: '^(#)?MaxAuthTries \d'
    line: 'MaxAuthTries {{ rhel9cis_ssh_maxauthtries }}'
    validate: sshd -t -f %s
  notify: Restart sshd

- name: "5.1.17 | PATCH | Ensure sshd MaxStartups is configured"
  when: rhel9cis_rule_5_1_17
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.17
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: (?i)^(#|)\s*MaxStartups
    line: 'MaxStartups {{ rhel9cis_ssh_maxstartups }}'
    validate: sshd -t -f %s
  notify: Restart sshd

- name: "5.1.18 | PATCH | Ensure SSH MaxSessions is set to 10 or less"
  when: rhel9cis_rule_5_1_18
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.18
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: (?i)^(#|)\s*MaxSessions
    line: 'MaxSessions {{ rhel9cis_ssh_maxsessions }}'
    validate: sshd -t -f %s
  notify: Restart sshd

- name: "5.1.19 | PATCH | Ensure sshd PermitEmptyPasswords is disabled"
  when: rhel9cis_rule_5_1_19
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.19
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: (?i)^(#|)\s*PermitEmptyPasswords
    line: 'PermitEmptyPasswords no'
    validate: sshd -t -f %s
  notify: Restart sshd

- name: "5.1.20 | PATCH | Ensure sshd PermitRootLogin is disabled"
  when: rhel9cis_rule_5_1_20
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.20
    - NIST800-53R5_AC-6
  block:
    - name: "5.1.20 | PATCH | Ensure sshd PermitRootLogin is disabled | config file"
      ansible.builtin.lineinfile:
        path: "{{ rhel9cis_sshd_config_file }}"
        regexp: (?i)^(#|)\s*PermitRootLogin
        line: 'PermitRootLogin no'
        validate: sshd -t -f %s
      notify: Restart sshd

    - name: "5.1.20 | PATCH | Ensure sshd PermitRootLogin is disabled | override file"
      ansible.builtin.file:
        path: /etc/ssh/sshd_config.d/01-permitrootlogin.conf
        state: absent
      notify: Restart sshd

- name: "5.1.21 | PATCH | Ensure sshd PermitUserEnvironment is disabled"
  when: rhel9cis_rule_5_1_21
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.21
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: (?i)^(#|)\s*PermitUserEnvironment
    line: 'PermitUserEnvironment no'
    validate: sshd -t -f %s
  notify: Restart sshd

- name: "5.1.22 | PATCH | Ensure SSH PAM is enabled"
  when: rhel9cis_rule_5_1_22
  tags:
    - level1-server
    - level1-workstation
    - patch
    - sshd
    - rule_5.1.22
    - NIST800-53R5_CM-1
    - NIST800-53R5_CM-2
    - NIST800-53R5_CM-6
    - NIST800-53R5_CM-7
    - NIST800-53R5_IA-5
  ansible.builtin.lineinfile:
    path: "{{ rhel9cis_sshd_config_file }}"
    regexp: (?i)^(#|)\s*UsePAM
    line: 'UsePAM yes'
    validate: sshd -t -f %s
  notify: Restart sshd