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134 lines
4.0 KiB
YAML
134 lines
4.0 KiB
YAML
---
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- name: Security fixes
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hosts: vpn-host
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remote_user: root
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vars_files:
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- config.cfg
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tasks:
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# Using a two-pass approach for checking directories in order to support symlinks.
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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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# auditd
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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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- name: Auditd rules configured
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template: src=audit.rules.j2 dest=/etc/audit/audit.rules
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notify:
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- restart auditd
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- name: Auditd configured
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template: src=auditd.conf.j2 dest=/etc/audit/auditd.conf
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notify:
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- restart auditd
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# Rsyslog
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- name: Rsyslog configured
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template: src=rsyslog.conf.j2 dest=/etc/rsyslog.conf
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notify:
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- restart rsyslog
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- name: Rsyslog CIS configured
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template: src=CIS.conf.j2 dest=/etc/rsyslog.d/CIS.conf owner=root group=root mode=0644
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notify:
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- restart rsyslog
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- name: Enable services
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service: name={{ item }} enabled=yes
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with_items:
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- auditd
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- rsyslog
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# Core dumps
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- name: Restrict Core Dumps - using pam limits
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lineinfile: dest=/etc/security/limits.conf line="* hard core 0" state=present
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- name: Restrict Core Dumps - using 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: Enable packet forwarding for IPv4
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sysctl: name=net.ipv4.ip_forward value=1
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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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handlers:
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- name: restart auditd
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service: name=auditd state=restarted
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- name: restart rsyslog
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service: name=rsyslog state=restarted
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- name: flush routing cache
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shell: echo 1 > /proc/sys/net/ipv4/route/flush
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