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95 lines
3.1 KiB
YAML
95 lines
3.1 KiB
YAML
- name: Install tools
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apt: name="{{ item }}" state=latest
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with_items:
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- unattended-upgrades
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- name: Configure unattended-upgrades
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template: src=50unattended-upgrades.j2 dest=/etc/apt/apt.conf.d/50unattended-upgrades owner=root group=root mode=0644
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- name: Periodic upgrades configured
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template: src=10periodic.j2 dest=/etc/apt/apt.conf.d/10periodic owner=root group=root mode=0644
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- name: Find directories for minimizing access
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stat:
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path: "{{ item }}"
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register: minimize_access_directories
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with_items:
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- '/usr/local/sbin'
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- '/usr/local/bin'
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- '/usr/sbin'
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- '/usr/bin'
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- '/sbin'
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- '/bin'
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- name: Minimize access
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file: path='{{ item.stat.path }}' mode='go-w' recurse=yes
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when: item.stat.isdir
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with_items: "{{ minimize_access_directories.results }}"
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no_log: True
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- name: Change shadow ownership to root and mode to 0600
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file: dest='/etc/shadow' owner=root group=root mode=0600
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- name: change su-binary to only be accessible to user and group root
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file: dest='/bin/su' owner=root group=root mode=0750
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- name: Collect Use of privileged commands
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shell: >
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/usr/bin/find {/usr/local/sbin,/usr/local/bin,/sbin,/bin,/usr/sbin,/usr/bin} -xdev \( -perm -4000 -o -perm -2000 \) -type f | awk '{print "-a always,exit -F path=" $1 " -F perm=x -F auid>=500 -F auid!=4294967295 -k privileged" }'
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args:
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executable: /bin/bash
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register: privileged_programs
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# Core dumps
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- name: Restrict core dumps (with PAM)
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lineinfile: dest=/etc/security/limits.conf line="* hard core 0" state=present
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- name: Restrict core dumps (with sysctl)
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sysctl: name=fs.suid_dumpable value=0 ignoreerrors=yes sysctl_set=yes reload=yes state=present
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# Kernel fixes
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- name: Disable Source Routed Packet Acceptance
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sysctl: name="{{item}}" value=0 ignoreerrors=yes sysctl_set=yes reload=yes state=present
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with_items:
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- net.ipv4.conf.all.accept_source_route
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- net.ipv4.conf.default.accept_source_route
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notify:
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- flush routing cache
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- name: Disable ICMP Redirect Acceptance
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sysctl: name="{{item}}" value=0 ignoreerrors=yes sysctl_set=yes reload=yes state=present
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with_items:
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- net.ipv4.conf.all.accept_redirects
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- net.ipv4.conf.default.accept_redirects
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- name: Disable Secure ICMP Redirect Acceptance
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sysctl: name="{{item}}" value=0 ignoreerrors=yes sysctl_set=yes reload=yes state=present
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with_items:
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- net.ipv4.conf.all.secure_redirects
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- net.ipv4.conf.default.secure_redirects
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notify:
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- flush routing cache
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- name: Enable Bad Error Message Protection
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sysctl: name=net.ipv4.icmp_ignore_bogus_error_responses value=1 ignoreerrors=yes sysctl_set=yes reload=yes state=present
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notify:
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- flush routing cache
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- name: Enable RFC-recommended Source Route Validation
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sysctl: name="{{item}}" value=1 ignoreerrors=yes sysctl_set=yes reload=yes state=present
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with_items:
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- net.ipv4.conf.all.rp_filter
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- net.ipv4.conf.default.rp_filter
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notify:
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- flush routing cache
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- name: Do not send ICMP redirects (we are not a router)
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sysctl: name=net.ipv4.conf.all.send_redirects value=0
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- name: SSH config
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template: src=sshd_config.j2 dest=/etc/ssh/sshd_config owner=root group=root mode=0644
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notify:
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- restart ssh
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