Create experimental auditd configuration
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9 changed files with 158 additions and 0 deletions
7
playbooks/auditd.yml
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7
playbooks/auditd.yml
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#!/usr/bin/env ansible-playbook
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---
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- hosts: services-*.pve.auro.re
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roles:
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- auditd
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...
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10
roles/auditd/handlers/main.yml
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10
roles/auditd/handlers/main.yml
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---
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- name: Restart auditd
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systemd:
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name: auditd.service
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state: restarted
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- name: Reload auditd rules
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command:
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cmd: augenrules --load
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...
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37
roles/auditd/tasks/main.yml
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37
roles/auditd/tasks/main.yml
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---
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- name: Install auditd
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apt:
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name:
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- auditd
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- audispd-plugins
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- name: Configure auditd and auditsp
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template:
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src: "{{ item }}.j2"
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dest: "/etc/audit/{{ item }}"
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owner: root
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group: root
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mode: u=r,g=,o=
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loop:
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- auditd.conf
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- plugins.d/syslog.conf
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- plugins.d/au-remote.conf
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- plugins.d/af_unix.conf
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- plugins.d/audispd-zos-remote.conf
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notify: Restart auditd
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- name: Configure auditd rules
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template:
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src: rules.d/audit.rules.j2
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dest: /etc/audit/rules.d/audit.rules
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owner: root
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group: root
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mode: u=r,g=,o=
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notify: Reload auditd rules
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- name: Enable auditd
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systemd:
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name: auditd.service
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enabled: true
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state: started
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...
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26
roles/auditd/templates/auditd.conf.j2
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26
roles/auditd/templates/auditd.conf.j2
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{{ ansible_managed | comment }}
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local_events = yes
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write_logs = no
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log_format = ENRICHED
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flush = INCREMENTAL_ASYNC
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freq = 50
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max_log_file = 8
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num_logs = 5
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priority_boost = 4
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name_format = NONE
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max_log_file_action = ROTATE
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space_left = 75
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space_left_action = SYSLOG
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verify_email = yes
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action_mail_acct = root
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admin_space_left = 50
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admin_space_left_action = SUSPEND
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disk_full_action = SUSPEND
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disk_error_action = SUSPEND
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use_libwrap = yes
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distribute_network = no
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q_depth = 400
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overflow_action = SYSLOG
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max_restarts = 10
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plugin_dir = /etc/audit/plugins.d
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3
roles/auditd/templates/plugins.d/af_unix.conf.j2
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3
roles/auditd/templates/plugins.d/af_unix.conf.j2
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{{ ansible_managed | comment }}
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active = no
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3
roles/auditd/templates/plugins.d/au-remote.conf.j2
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3
roles/auditd/templates/plugins.d/au-remote.conf.j2
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{{ ansible_managed | comment }}
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active = no
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{{ ansible_managed | comment }}
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active = no
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8
roles/auditd/templates/plugins.d/syslog.conf.j2
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8
roles/auditd/templates/plugins.d/syslog.conf.j2
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{{ ansible_managed | comment }}
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active = yes
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direction = out
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path = /sbin/audisp-syslog
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type = always
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args = LOG_INFO LOG_LOCAL6
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format = string
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61
roles/auditd/templates/rules.d/audit.rules.j2
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61
roles/auditd/templates/rules.d/audit.rules.j2
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{{ ansible_managed | comment }}
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-D
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-b 8192
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--backlog_wait_time 60000
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-f 1
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# Configuration changes
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-w /etc/ -p wa -k etc
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# Usage of auditd tools
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-w /sbin/auditctl -p x -k audit_tools
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-w /sbin/auditd -p x -k audit_tools
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-w /usr/sbin/augenrules -p x -k audit_tools
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# Modules changes
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-a always,exit -F perm=x -F auid!=-1 -F path=/sbin/insmod -k modules
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-a always,exit -F perm=x -F auid!=-1 -F path=/sbin/modprobe -k modules
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-a always,exit -F perm=x -F auid!=-1 -F path=/sbin/rmmod -k modules
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-a always,exit -F arch=b32 -S finit_module,init_module,delete_module -F auid!=-1 -k modules
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-a always,exit -F arch=b64 -S finit_module,init_module,delete_module -F auid!=-1 -k modules
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# Mount
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-a always,exit -F arch=b32 -S mount,umount,umount2 -F auid!=-1 -k mount
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-a always,exit -F arch=b64 -S mount,umount2 -F auid!=-1 -k mount
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# Swap
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-a always,exit -F arch=b64 -S swapon -S swapoff -F auid!=-1 -k swap
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-a always,exit -F arch=b32 -S swapon -S swapoff -F auid!=-1 -k swap
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# Ptrace
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-a always,exit -F arch=b32 -S ptrace -F a0=0x4 -k code_injection
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-a always,exit -F arch=b64 -S ptrace -F a0=0x4 -k code_injection
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-a always,exit -F arch=b32 -S ptrace -F a0=0x5 -k data_injection
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-a always,exit -F arch=b64 -S ptrace -F a0=0x5 -k data_injection
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-a always,exit -F arch=b32 -S ptrace -F a0=0x6 -k register_injection
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-a always,exit -F arch=b64 -S ptrace -F a0=0x6 -k register_injection
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-a always,exit -F arch=b32 -S ptrace -k tracing
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-a always,exit -F arch=b64 -S ptrace -k tracing
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# Unauthorized file accesses
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-a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid!=-1 -k file_access
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-a always,exit -F arch=b32 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid!=-1 -k file_access
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-a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EACCES -F auid!=-1 -k file_access
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-a always,exit -F arch=b64 -S creat,open,openat,open_by_handle_at,truncate,ftruncate -F exit=-EPERM -F auid!=-1 -k file_access
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# Unauthorized file creations
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-a always,exit -F arch=b32 -S creat,link,mknod,mkdir,symlink,mknodat,linkat,symlinkat -F exit=-EACCES -k file_creation
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-a always,exit -F arch=b64 -S mkdir,creat,link,symlink,mknod,mknodat,linkat,symlinkat -F exit=-EACCES -k file_creation
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-a always,exit -F arch=b32 -S link,mkdir,symlink,mkdirat -F exit=-EPERM -k file_creation
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-a always,exit -F arch=b64 -S mkdir,link,symlink,mkdirat -F exit=-EPERM -k file_creation
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# Unauthorized file modifications
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-a always,exit -F arch=b32 -S rename,renameat,truncate,chmod,setxattr,lsetxattr,removexattr,lremovexattr -F exit=-EACCES -k file_modification
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-a always,exit -F arch=b64 -S rename,renameat,truncate,chmod,setxattr,lsetxattr,removexattr,lremovexattr -F exit=-EACCES -k file_modification
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-a always,exit -F arch=b32 -S rename,renameat,truncate,chmod,setxattr,lsetxattr,removexattr,lremovexattr -F exit=-EPERM -k file_modification
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-a always,exit -F arch=b64 -S rename,renameat,truncate,chmod,setxattr,lsetxattr,removexattr,lremovexattr -F exit=-EPERM -k file_modification
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# Usage of 32 bit syscalls
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-a always,exit -F arch=b32 -S all -k 32bit_api
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