65 lines
2.6 KiB
YAML
65 lines
2.6 KiB
YAML
---
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- name: Adjust SSHD config
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ansible.builtin.lineinfile:
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path: /mnt/etc/ssh/sshd_config
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regexp: ^\s*#?{{ item.option }}\s+.*$
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line: "{{ item.option }} {{ item.value }}"
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loop:
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- { option: LogLevel, value: VERBOSE }
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- { option: LoginGraceTime, value: "60" }
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- { option: PermitRootLogin, value: "no" }
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- { option: StrictModes, value: "yes" }
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- { option: MaxAuthTries, value: "4" }
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- { option: MaxSessions, value: "10" }
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- { option: MaxStartups, value: "10:30:60" }
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- { option: PubkeyAuthentication, value: "yes" }
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- { option: HostbasedAuthentication, value: "no" }
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- { option: IgnoreRhosts, value: "yes" }
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- { option: PasswordAuthentication, value: "no" }
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- { option: PermitEmptyPasswords, value: "no" }
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- { option: KerberosAuthentication, value: "no" }
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- { option: GSSAPIAuthentication, value: "no" }
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- { option: AllowAgentForwarding, value: "no" }
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- { option: AllowTcpForwarding, value: "no" }
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- { option: KbdInteractiveAuthentication, value: "no" }
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- { option: GatewayPorts, value: "no" }
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- { option: X11Forwarding, value: "no" }
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- { option: PermitUserEnvironment, value: "no" }
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- { option: ClientAliveInterval, value: "300" }
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- { option: ClientAliveCountMax, value: "1" }
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- { option: PermitTunnel, value: "no" }
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- { option: Banner, value: /etc/issue.net }
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- name: Detect target OpenSSH version
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ansible.builtin.shell: >-
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{{ chroot_command }} ssh -V 2>&1 | grep -oP 'OpenSSH_\K[0-9]+\.[0-9]+'
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register: cis_sshd_openssh_version
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changed_when: false
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failed_when: false
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- name: Append CIS specific configurations to sshd_config
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vars:
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cis_sshd_has_mlkem: "{{ (cis_sshd_openssh_version.stdout | default('0.0') is version('9.9', '>=')) }}"
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cis_sshd_kex: >-
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{{
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(['mlkem768x25519-sha256'] if cis_sshd_has_mlkem | bool else [])
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+ ['curve25519-sha256@libssh.org', 'ecdh-sha2-nistp521', 'ecdh-sha2-nistp384', 'ecdh-sha2-nistp256']
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}}
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ansible.builtin.blockinfile:
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path: /mnt/etc/ssh/sshd_config
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marker: "# {mark} CIS SSH HARDENING"
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block: |-
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## CIS Specific
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### Ciphers and keying ###
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RekeyLimit 512M 6h
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KexAlgorithms {{ cis_sshd_kex | join(',') }}
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Ciphers aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
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MACs hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com
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###########################
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AllowStreamLocalForwarding no
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PermitUserRC no
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AllowUsers *
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AllowGroups *
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DenyUsers nobody
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DenyGroups nobody
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