audit

Table of Contents

1. Overview
2. Module Description
3. Setup
   • What audit affects
   • Setup requirements
   • Beginning with audit
4. Usage
5. Reference
6. Limitations
7. Development
   • Contributing

Overview

Basic auditd support

Module Description

basic support for auditd

Setup

What audit affects

manages:

• audit package
• audit service
• /etc/audit/audit.rules

Setup Requirements

This module requires pluginsync enabled

To be able to manage logrotate files it needs eyp-logrotate

Beginning with audit

should work out of the box:

class { 'audit': }

Usage

Add default rules:

class { 'audit': }

tty audit:

class { 'audit': }

class { 'audit::tty': }

Reference

classes

audit

• buffers: buffers to survive stress events (default: 320)
• add_default_rules: add the following default rules - it will apply b64 only if is applicable, same for /etc/sysconfig/network (default: true)
• manage_logrotate: add logrotate config file (default: true)
• logrotate_rotate = '4',
• logrotate_compress = true,
• logrotate_missingok = true,
• logrotate_notifempty = true,
• logrotate_frequency = 'weekly',

-w /var/tmp -p x
-w /tmp -p x
-w /home -p x
#Record Events That Modify Date and Time Information
-a always,exit -F arch=b64 -S adjtimex -S settimeofday -k time-change
-a always,exit -F arch=b32 -S adjtimex -S settimeofday -S stime -k time-change
-a always,exit -F arch=b64 -S clock_settime -k time-change
-a always,exit -F arch=b32 -S clock_settime -k time-change
-w /etc/localtime -p wa -k time-change
#Record Events That Modify User/Group Information
-w /etc/group -p wa -k identity
-w /etc/passwd -p wa -k identity
-w /etc/gshadow -p wa -k identity
-w /etc/shadow -p wa -k identity
-w /etc/security/opasswd -p wa -k identity
#Record Events That Modify the System\'s Network Environment
-a exit,always -F arch=b64 -S sethostname -S setdomainname -k system-locale
-a exit,always -F arch=b32 -S sethostname -S setdomainname -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
-w /etc/sysconfig/network -p wa -k system-locale
#Collect Login and Logout Events
-w /var/log/faillog -p wa -k logins
-w /var/log/lastlog -p wa -k logins
-w /var/log/btmp -p wa -k session
#Collect Session Initiation Information
-w /var/run/utmp -p wa -k session
-w /var/log/wtmp -p wa -k session
#Collect Discretionary Access Control Permission Modification Events
-a always,exit -F arch=b64 -S chmod -S fchmod -S fchmodat -F auid>=500  -F auid!=4294967295 -k perm_mod
-a always,exit -F arch=b32 -S chmod -S fchmod -S fchmodat -F auid>=500  -F auid!=4294967295 -k perm_mod
-a always,exit -F arch=b64 -S chown -S fchown -S fchownat -S lchown -F auid>=500  -F auid!=4294967295 -k perm_mod
-a always,exit -F arch=b32 -S chown -S fchown -S fchownat -S lchown -F auid>=500  -F auid!=4294967295 -k perm_mod
-a always,exit -F arch=b64 -S setxattr -S lsetxattr -S fsetxattr -S removexattr -S  lremovexattr -S fremovexattr -F auid>=500 -F auid!=4294967295 -k perm_mod
-a always,exit -F arch=b32 -S setxattr -S lsetxattr -S fsetxattr -S removexattr -S  lremovexattr -S fremovexattr -F auid>=500 -F auid!=4294967295 -k perm_mod
#Collect Unsuccessful Unauthorized Access Attempts to Files
-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate -S ftruncate  -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate -S ftruncate  -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b64 -S creat -S open -S openat -S truncate -S ftruncate  -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access
-a always,exit -F arch=b32 -S creat -S open -S openat -S truncate -S ftruncate  -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k access
#Collect mount system call by non-privileged user
-a always,exit -F arch=b64 -S mount -F auid>=500 -F auid!=4294967295 -k mounts
-a always,exit -F arch=b32 -S mount -F auid>=500 -F auid!=4294967295 -k mounts
#Collect File Deletion Events by User
-a always,exit -F arch=b64 -S unlink -S unlinkat -S rename -S renameat -F auid>=500  -F auid!=4294967295 -k delete
-a always,exit -F arch=b32 -S unlink -S unlinkat -S rename -S renameat -F auid>=500  -F auid!=4294967295 -k delete
#Collect Changes to System Administration Scope
-w /etc/sudoers -p wa -k scope
#Collect Kernel Module Loading and Unloading
-w /sbin/insmod -p x -k modules
-w /sbin/rmmod -p x -k modules
-w /sbin/modprobe -p x -k modules

audit::tty

• disable: For each user matching one of comma-separated glob patterns, disable TTY auditing (default: *)
• enable: For each user matching one of comma-separated glob patterns, disable TTY auditing This overrides any previous disable option matching the same user name on the command line. (default: *)

Limitations

Tested on:

• CentOS 5
• CentOS 6
• CentOS 7
• Ubuntu 14.04
• SLES11SP3

Development

We are pushing to have acceptance testing in place, so any new feature should have some test to check both presence and absence of any feature

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Added some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

CHANGELOG

0.1.14

• added flag to enable logging changes of login logs

0.1.13

• added default security rules using flags to be able to enable a subset:
  • log_alter_time
  • log_dac
  • log_netconf_changes
  • log_file_deletions
  • log_export_media
  • log_kmod_load_unload
  • log_priv_commands

0.1.12

• bugfix audit::fsrule and audit::syscallrule

0.1.11

• rules management:
  • audit::syscallrule
  • audit::fsrule

0.1.10

• added Ubuntu 16.04 support

0.1.9

• removed audit::tty (moved to pam::ttyaudit)

0.1.8

• added ::logrotate as a dependency

0.1.7

• fixed typo

0.1.6

• logrotate configuration file using eyp-logrotate (manage_logrotate=>false to disable)