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Issue 38/add arch support for auditd templates #273

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Issue 38/add arch support for auditd templates #273

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6dea407
Added syscalls table for all arch
arousseau-coveo Jan 16, 2025
cbcee90
fix arch name to match ansible provided arch
arousseau-coveo Jan 16, 2025
baa4027
added aarch64 to pre audit setup conditions
arousseau-coveo Jan 23, 2025
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2 changes: 1 addition & 1 deletion tasks/LE_audit_setup.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@
audit_pkg_arch_name: AMD64

- name: Pre Audit Setup | Set audit package name | ARM64
when: ansible_facts.machine == "arm64"
when: (ansible_facts.machine == "arm64" or ansible_facts.machine == "aarch64")
ansible.builtin.set_fact:
audit_pkg_arch_name: ARM64

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12 changes: 10 additions & 2 deletions tasks/auditd.yml
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Original file line number Diff line number Diff line change
@@ -1,4 +1,10 @@
---
# Since auditd rules are dependent on syscalls and syscall tables are architecture specific,
# we need to update the auditd rules depending on the architecture of the system.
# This task passed the syscalls table to the auditd template and updates the auditd rules
- name: Set supported_syscalls variable
shell: ausyscall --dump | awk '{print $2}'
register: syscalls

- name: POST | Apply auditd template for section 4.1.3.x
when: update_audit_template
Expand All @@ -7,7 +13,9 @@
dest: /etc/audit/rules.d/99_auditd.rules
owner: root
group: root
mode: '0640'
mode: "0640"
vars:
supported_syscalls: "{{ syscalls.stdout_lines }}"
register: discovered_audit_rules_updated
notify:
- Auditd rules reload
Expand All @@ -22,7 +30,7 @@
dest: /etc/audit/rules.d/98_auditd_exceptions.rules
owner: root
group: root
mode: '0600'
mode: "0600"
notify: Restart auditd

- name: POST | Flush handlers
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135 changes: 112 additions & 23 deletions templates/audit/99_auditd.rules.j2
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Original file line number Diff line number Diff line change
@@ -1,30 +1,49 @@

## Ansible controlled file
# Added as part of ansible-lockdown CIS baseline
# provided by Mindpoint Group - A Tyto Athene Company / Ansible Lockdown
## YOUR CHANGED WILL BE LOST!

# This template will set all of the auditd configurations via a handler in the role in one task instead of individually

{% if ubtu22cis_rule_6_3_3_1 %}
-w /etc/sudoers -p wa -k scope
-w /etc/sudoers.d/ -p wa -k scope
{% endif %}
{% if ubtu22cis_rule_6_3_3_2 %}
-a always,exit -F arch=b64 -C euid!=uid -F auid!=unset -S execve -k user_emulation
-a always,exit -F arch=b32 -C euid!=uid -F auid!=unset -S execve -k user_emulation
{% set syscalls = ["execve"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -C euid!=uid -F auid!=unset -S {{ arch_syscalls|join(',') }} -k user_emulation
-a always,exit -F arch=b32 -C euid!=uid -F auid!=unset -S {{ arch_syscalls|join(',') }} -k user_emulation
{% endif %}
{% if ubtu22cis_rule_6_3_3_3 %}
-w {{ ubtu22cis_sudo_logfile }} -p wa -k sudo_log_file
{% endif %}
{% if ubtu22cis_rule_6_3_3_4 %}
-a always,exit -F arch=b64 -S adjtimex,settimeofday,clock_settime -k time-change
-a always,exit -F arch=b32 -S adjtimex,settimeofday,clock_settime -k time-change
{% set syscalls = ["adjtimex","settimeofday","clock_settime"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -k time-change
-a always,exit -F arch=b32 -S {{ arch_syscalls|join(',') }} -k time-change
-w /etc/localtime -p wa -k time-change
{% endif %}
{% if ubtu22cis_rule_6_3_3_5 %}
-a always,exit -F arch=b64 -S sethostname,setdomainname -k system-locale
-a always,exit -F arch=b32 -S sethostname,setdomainname -k system-locale
{% set syscalls = ["sethostname","setdomainname"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -k system-locale
-a always,exit -F arch=b32 -S {{ arch_syscalls|join(',') }} -k system-locale
-w /etc/issue -p wa -k system-locale
-w /etc/issue.net -p wa -k system-locale
-w /etc/hosts -p wa -k system-locale
Expand All @@ -40,10 +59,17 @@
{% endif %}
{% endif %}
{% if ubtu22cis_rule_6_3_3_7 %}
-a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access
-a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access
-a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access
-a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access
{% set syscalls = ["creat","open","openat","truncate","ftruncate"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access
-a always,exit -F arch=b32 -S {{ arch_syscalls|join(',') }} -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access
-a always,exit -F arch=b32 -S {{ arch_syscalls|join(',') }} -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access
{% endif %}
{% if ubtu22cis_rule_6_3_3_8 %}
-w /etc/group -p wa -k identity
Expand All @@ -56,16 +82,65 @@
-w /etc/pam.d -p wa -k identity
{% endif %}
{% if ubtu22cis_rule_6_3_3_9 %}
-a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_mod
-a always,exit -F arch=b64 -S chown,fchown,lchown,fchownat -F auid>=1000 -F auid!=unset -k perm_mod
-a always,exit -F arch=b64 -S setxattr,lsetxattr,fsetxattr,removexattr,lremovexattr,fremovexattr -F auid>=1000 -F auid!=unset -k perm_mod
-a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_mod
-a always,exit -F arch=b32 -S chown,fchown,lchown,fchownat -F auid>=1000 -F auid!=unset -k perm_mod
-a always,exit -F arch=b32 -S setxattr,lsetxattr,fsetxattr,removexattr,lremovexattr,fremovexattr -F auid>=1000 -F auid!=unset -k perm_mod
{% set syscalls = ["chmod","fchmod","fchmodat"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k perm_mod
{% set syscalls = ["chown","fchown","lchown","fchownat"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k perm_mod
{% set syscalls = ["etxattr","lsetxattr","fsetxattr","removexattr","lremovexattr","fremovexattr"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k perm_mod
{% set syscalls = ["chmod","fchmod","fchmodat"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b32 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k perm_mod
{% set syscalls = ["chown","fchown","lchown","fchownat"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b32 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k perm_mod
{% set syscalls = ["setxattr","lsetxattr","fsetxattr","removexattr","lremovexattr","fremovexattr"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b32 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k perm_mod
{% endif %}
{% if ubtu22cis_rule_6_3_3_10 %}
-a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=unset -k mounts
-a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=unset -k mounts
{% set syscalls = ["mount"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k mounts
-a always,exit -F arch=b32 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k mounts
{% endif %}
{% if ubtu22cis_rule_6_3_3_11 %}
-w /var/run/utmp -p wa -k session
Expand All @@ -77,8 +152,15 @@
-w /var/run/faillock -p wa -k logins
{% endif %}
{% if ubtu22cis_rule_6_3_3_13 %}
-a always,exit -F arch=b64 -S unlink,unlinkat,rename,renameat -F auid>=1000 -F auid!=unset -k delete
-a always,exit -F arch=b32 -S unlink,unlinkat,rename,renameat -F auid>=1000 -F auid!=unset -k delete
{% set syscalls = ["unlink","unlinkat","rename","renameat"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k delete
-a always,exit -F arch=b32 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=unset -k delete
{% endif %}
{% if ubtu22cis_rule_6_3_3_14 %}
-w /etc/apparmor/ -p wa -k MAC-policy
Expand All @@ -98,7 +180,14 @@
{% endif %}
{% if ubtu22cis_rule_6_3_3_19 %}
-a always,exit -F path=/usr/bin/kmod -F perm=x -F auid>=1000 -F auid!=-1 -k kernel_modules
-a always,exit -F arch=b64 -S init_module,finit_module,delete_module -F auid>=1000 -F auid!=-1 -k kernel_modules
{% set syscalls = ["init_module","finit_module","delete_module"] %}
{% set arch_syscalls = [] %}
{% for syscall in syscalls %}
{% if syscall in supported_syscalls %}
{{ arch_syscalls.append( syscall) }}
{% endif %}
{% endfor %}
-a always,exit -F arch=b64 -S {{ arch_syscalls|join(',') }} -F auid>=1000 -F auid!=-1 -k kernel_modules
{% endif %}
{% if ubtu22cis_rule_6_3_3_20 %}
-e 2
Expand Down
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