187 lines
8.4 KiB
YAML
187 lines
8.4 KiB
YAML
---
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- name: Configurationg System for CIS conformity
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block:
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- name: Disable Kernel Modules
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ansible.builtin.copy:
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dest: /mnt/etc/modprobe.d/cis.conf
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mode: '0644'
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content: |
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CIS LVL 3 Restrictions
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install freevxfs /bin/true
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install jffs2 /bin/true
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install hfs /bin/true
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install hfsplus /bin/true
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install squashfs /bin/true
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install udf /bin/true
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install usb-storage /bin/true
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install dccp /bin/true
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install sctp /bin/true
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install rds /bin/true
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install tipc /bin/true
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- name: Create USB Rules
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ansible.builtin.copy:
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dest: /mnt/etc/udev/rules.d/10-cis_usb_devices.sh
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mode: '0644'
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content: |
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By default, disable all.
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ACTION=="add", SUBSYSTEMS=="usb", TEST=="authorized_default", ATTR{authorized_default}="0"
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Enable hub devices.
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ACTION=="add", ATTR{bDeviceClass}=="09", TEST=="authorized", ATTR{authorized}="1"
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Enables keyboard devices
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ACTION=="add", ATTR{product}=="*[Kk]eyboard*", TEST=="authorized", ATTR{authorized}="1"
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PS2-USB converter
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ACTION=="add", ATTR{product}=="*Thinnet TM*", TEST=="authorized", ATTR{authorized}="1"
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- name: Create a consolidated sysctl configuration file
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ansible.builtin.copy:
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dest: /mnt/etc/sysctl.d/10-cis.conf
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mode: '0644'
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content: |
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## CIS Sysctl configurations
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net.ipv4.conf.all.log_martians = 1
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net.ipv4.conf.all.rp_filter = 1
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net.ipv4.conf.all.secure_redirects = 0
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.default.log_martians = 1
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net.ipv4.conf.default.rp_filter = 1
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net.ipv4.conf.default.secure_redirects = 0
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net.ipv4.conf.default.send_redirects = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv6.conf.all.accept_redirects = 0
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net.ipv6.conf.all.disable_ipv6 = 1
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net.ipv6.conf.default.accept_redirects = 0
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net.ipv6.conf.default.disable_ipv6 = 1
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net.ipv6.conf.lo.disable_ipv6 = 1
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# - name: Adjust login.defs
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# replace:
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# path: /mnt/etc/login.defs
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# regexp: "{{ item.regexp }}"
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# replace: "{{ item.replace }}"
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# loop:
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# - { regexp: '^PASS_MAX_DAYS.*', replace: 'PASS_MAX_DAYS 90' }
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# - { regexp: '^PASS_MIN_DAYS.*', replace: 'PASS_MIN_DAYS 7' }
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# - { regexp: '^UMASK.*', replace: 'UMASK 027' }
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- name: Ensure files exist
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ansible.builtin.file:
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path: "{{ item }}"
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state: touch
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mode: "0600"
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loop:
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- /mnt/etc/at.allow
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- /mnt/etc/cron.allow
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- /mnt/etc/hosts.allow
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- /mnt/etc/hosts.deny
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- name: Add Security related lines into config files
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ansible.builtin.lineinfile:
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path: "{{ item.path }}"
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line: "{{ item.content }}"
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loop:
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- { path: /mnt/etc/security/limits.conf, content: "* hard core 0" }
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- { path: /mnt/etc/security/pwquality.conf, content: minlen = 14 }
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- { path: /mnt/etc/security/pwquality.conf, content: dcredit = -1 }
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- { path: /mnt/etc/security/pwquality.conf, content: ucredit = -1 }
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- { path: /mnt/etc/security/pwquality.conf, content: ocredit = -1 }
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- { path: /mnt/etc/security/pwquality.conf, content: lcredit = -1 }
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- { path: '/mnt/etc/{{ "bashrc" if os in ["almalinux", "fedora", "rocky"] else "bash.bashrc" }}', content: umask 077 }
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- { path: '/mnt/etc/{{ "bashrc" if os in ["almalinux", "fedora", "rocky"] else "bash.bashrc" }}', content: export TMOUT=3000 }
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- { path: '/mnt/{{ "usr/lib/systemd/journald.conf" if os == "fedora" else "etc/systemd/journald.conf" }}', content: Storage=persistent }
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- { path: /mnt/etc/sudoers, content: Defaults logfile="/var/log/sudo.log" }
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- { path: /mnt/etc/pam.d/su, content: auth required pam_wheel.so }
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- { path: '/mnt/etc/{{ "pam.d/common-auth" if os in ["debian11", "debian12", "ubuntu", "ubuntu-lts"]
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else "authselect/system-auth" if os == "fedora" else "pam.d/system-auth" }}',
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content: auth required pam_faillock.so onerr=fail audit silent deny=5 unlock_time=900 }
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- { path: '/mnt/etc/{{ "pam.d/common-account" if os in ["debian11", "debian12", "ubuntu", "ubuntu-lts"] else "authselect/system-auth"
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if os == "fedora" else "pam.d/system-auth" }}', content: account required pam_faillock.so }
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- { path: '/mnt/etc/pam.d/{{ "common-password" if os in ["debian11", "debian12", "ubuntu", "ubuntu-lts"] else "passwd" }}',
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content: "password [success=1 default=ignore] pam_unix.so obscure sha512 remember=5" }
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- { path: /mnt/etc/hosts.deny, content: "ALL: ALL" }
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- { path: /mnt/etc/hosts.allow, content: "sshd: ALL" }
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- name: Set permissions for various files and directories
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ansible.builtin.file:
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path: "{{ item.path }}"
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owner: "{{ item.owner | default(omit) }}"
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group: "{{ item.group | default(omit) }}"
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mode: "{{ item.mode }}"
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loop:
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- { path: /mnt/etc/ssh/sshd_config, mode: "0600" }
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- { path: /mnt/etc/cron.hourly, mode: "0700" }
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- { path: /mnt/etc/cron.daily, mode: "0700" }
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- { path: /mnt/etc/cron.weekly, mode: "0700" }
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- { path: /mnt/etc/cron.monthly, mode: "0700" }
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- { path: /mnt/etc/cron.d, mode: "0700" }
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- { path: /mnt/etc/crontab, mode: "0600" }
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- { path: /mnt/etc/logrotate.conf, mode: "0644" }
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- { path: /mnt/usr/sbin/pppd, mode: "754" }
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- { path: '/mnt/usr/bin/{{ "fusermount3" if os in ["archlinux", "debian12", "fedora"] else "fusermount" }}', mode: "755" }
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- { path: '/mnt/usr/bin/{{ "write.ul" if os == "debian11" else "write" }}', mode: "755" }
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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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with_items:
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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: GSSAPIKeyExchange, value: "no" }
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- { option: AllowAgentForwarding, value: "no" }
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- { option: AllowTcpForwarding, value: "no" }
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- { option: ChallengeResponseAuthentication, 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: "0" }
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- { option: PermitTunnel, value: "no" }
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- { option: Banner, value: /etc/issue.net }
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- name: Append CIS Specific configurations to sshd_config
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ansible.builtin.lineinfile:
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path: /mnt/etc/ssh/sshd_config
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line: |2-
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## CIS Specific
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Protocol 2
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### Ciphers and keying ###
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RekeyLimit 512M 6h
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KexAlgorithms curve25519-sha256,curve25519-sha256@libssh.org,
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diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,
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diffie-hellman-group18-sha512,ecdh-sha2-nistp521,ecdh-sha2-nistp384,
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ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256
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Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,
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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,
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hmac-sha2-512,hmac-sha2-256
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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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