330 lines
9.5 KiB
Markdown
330 lines
9.5 KiB
Markdown
# xoxys.auditd
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[](https://ci.rknet.org/repos/ansible/xoxys.auditd)
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[](https://gitea.rknet.org/ansible/xoxys.auditd/src/branch/main/LICENSE)
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Setup the Linux Auditing System.
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## Table of content
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- [Requirements](#requirements)
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- [Default Variables](#default-variables)
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- [auditd_action_mail_acct](#auditd_action_mail_acct)
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- [auditd_admin_space_left_action](#auditd_admin_space_left_action)
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- [auditd_buffer_size](#auditd_buffer_size)
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- [auditd_config_immutable](#auditd_config_immutable)
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- [auditd_exclude_rule_stages](#auditd_exclude_rule_stages)
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- [auditd_failure_mode](#auditd_failure_mode)
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- [auditd_filter_rules_default](#auditd_filter_rules_default)
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- [auditd_filter_rules_extra](#auditd_filter_rules_extra)
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- [auditd_main_rules_default](#auditd_main_rules_default)
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- [auditd_main_rules_extra](#auditd_main_rules_extra)
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- [auditd_max_log_file](#auditd_max_log_file)
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- [auditd_max_log_file_action](#auditd_max_log_file_action)
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- [auditd_num_logs](#auditd_num_logs)
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- [auditd_optional_rules_default](#auditd_optional_rules_default)
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- [auditd_optional_rules_extra](#auditd_optional_rules_extra)
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- [auditd_reboot_on_change](#auditd_reboot_on_change)
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- [auditd_refuse_manual_stop](#auditd_refuse_manual_stop)
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- [auditd_space_left_action](#auditd_space_left_action)
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- [Dependencies](#dependencies)
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- [License](#license)
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- [Author](#author)
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---
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## Requirements
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- Minimum Ansible version: `2.10`
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## Default Variables
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### auditd_action_mail_acct
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#### Default value
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```YAML
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auditd_action_mail_acct: root
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```
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### auditd_admin_space_left_action
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#### Default value
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```YAML
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auditd_admin_space_left_action: halt
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```
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### auditd_buffer_size
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#### Default value
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```YAML
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auditd_buffer_size: 8192
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```
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### auditd_config_immutable
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The auditd daemon is configured to use the augenrules program to read audit rules during
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daemon startup (the default), use this option to make the auditd configuration immutable.
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#### Default value
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```YAML
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auditd_config_immutable: false
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```
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### auditd_exclude_rule_stages
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There is a set of pre-defined rule stages you can exclude if needed. Availabe stages:
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10-start.rules, 11-self-audit.rules, 12-filter.rules, 30-main.rules, 50-optional.rules, 90-finalize
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#### Default value
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```YAML
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auditd_exclude_rule_stages: []
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```
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#### Example usage
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```YAML
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auditd_exclude_rule_stages:
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- 10-start.rules
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- 90-finalize
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```
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### auditd_failure_mode
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Possible values: 0 (silent) | 1 (printk, print a failure message) | 2 (panic, halt the system)
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#### Default value
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```YAML
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auditd_failure_mode: 1
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```
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### auditd_filter_rules_default
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#### Default value
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```YAML
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auditd_filter_rules_default:
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- comment: Ignore current working directory records
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rule: -a always,exclude -F msgtype=CWD
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- comment: Ignore EOE records (End Of Event, not needed)
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rule: -a always,exclude -F msgtype=EOE
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- comment: Cron jobs fill the logs with stuff we normally don't want
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rule:
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- -a never,user -F subj_type=crond_t
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- -a exit,never -F subj_type=crond_t
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- comment: This is not very interesting and wastes a lot of space if the server
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is public facing
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rule: -a always,exclude -F msgtype=CRYPTO_KEY_USER
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- comment: High Volume Event Filter
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rule:
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- -a exit,never -F arch=b32 -F dir=/dev/shm -k sharedmemaccess
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- -a exit,never -F arch=b64 -F dir=/dev/shm -k sharedmemaccess
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- -a exit,never -F arch=b32 -F dir=/var/lock/lvm -k locklvm
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- -a exit,never -F arch=b64 -F dir=/var/lock/lvm -k locklvm
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```
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### auditd_filter_rules_extra
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#### Default value
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```YAML
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auditd_filter_rules_extra: []
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```
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#### Example usage
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```YAML
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auditd_filter_rules_extra:
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- comment: Ignore current working directory records # defaults to not set
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rule: '-a always,exclude -F msgtype=CWD' # can be list or string
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state: present # defaults to present
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```
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### auditd_main_rules_default
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#### Default value
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```YAML
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auditd_main_rules_default:
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- comment: CIS 4.1.3.1 - Changes to system administration scope
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rule:
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- -w /etc/sudoers -p wa -k actions
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- -w /etc/sudoers.d/ -p wa -k actions
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- comment: CIS 4.1.3.4 - Events that modify date and time information
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rule:
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- -a always,exit -F arch=b64 -S adjtimex,settimeofday,clock_settime -k time_change
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- -a always,exit -F arch=b32 -S adjtimex,settimeofday,clock_settime,stime -k
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time_change
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- -w /etc/localtime -p wa -k time-change
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- comment: CIS 4.1.3.5 - Changes to the network environment
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rule:
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- -a always,exit -F arch=b64 -S sethostname,setdomainname -k system-locale
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- -a always,exit -F arch=b32 -S sethostname,setdomainname -k system-locale
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- -w /etc/issue -p wa -k system-locale
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- -w /etc/issue.net -p wa -k system-locale
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- -w /etc/hosts -p wa -k system-locale
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- -w /etc/sysconfig/network -p wa -k system-locale
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- -w /etc/sysconfig/network-scripts/ -p wa -k system-locale
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- comment: CIS 4.1.3.7 - Unsuccessful file access attempts
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rule:
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- -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate -F exit=-EACCES
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-F auid>=1000 -F auid!=unset -k access
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- -a always,exit -F arch=b64 -S creat,open,openat,truncate,ftruncate -F exit=-EPERM
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-F auid>=1000 -F auid!=unset -k access
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- -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate -F exit=-EACCES
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-F auid>=1000 -F auid!=unset -k access
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- -a always,exit -F arch=b32 -S creat,open,openat,truncate,ftruncate -F exit=-EPERM
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-F auid>=1000 -F auid!=unset -k access
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- comment: CIS 4.1.3.8 - Modify user/group information
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rule:
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- -w /etc/group -p wa -k identity
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- -w /etc/passwd -p wa -k identity
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- -w /etc/gshadow -p wa -k identity
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- -w /etc/shadow -p wa -k identity
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- -w /etc/security/opasswd -p wa -k identity
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- comment: CIS 4.1.3.9 - Discretionary access control permission modifications
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rule:
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- -a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset
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-F key=perm_mod
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- -a always,exit -F arch=b64 -S chown,fchown,lchown,fchownat -F auid>=1000 -F
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auid!=unset -F key=perm_mod
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- -a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset
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-F key=perm_mod
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- -a always,exit -F arch=b32 -S lchown,fchown,chown,fchownat -F auid>=1000 -F
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auid!=unset -F key=perm_mod
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- -a always,exit -F arch=b64 -S setxattr,lsetxattr,fsetxattr,removexattr,lremovexattr,fremovexattr
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-F auid>=1000 -F auid!=unset -F key=perm_mod
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- -a always,exit -F arch=b32 -S setxattr,lsetxattr,fsetxattr,removexattr,lremovexattr,fremovexattr
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-F auid>=1000 -F auid!=unset -F key=perm_mod
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- comment: CIS 4.1.3.10 - Successful file system mounts
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rule:
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- -a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=4294967295 -k mounts
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- -a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=4294967295 -k mounts
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- comment: CIS 4.1.3.11 - Session initiation information
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rule:
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- -w /var/run/utmp -p wa -k session
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- -w /var/log/wtmp -p wa -k logins
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- -w /var/log/btmp -p wa -k logins
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- comment: CIS 4.1.3.12 - Login and logout events
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rule:
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- -w /var/log/lastlog -p wa -k logins
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- -w /var/log/tallylog -p wa -k logins
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- -w /var/run/faillock -p wa -k logins
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- comment: CIS 4.1.3.13 - File deletion events by users
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rule:
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- -a always,exit -F arch=b64 -S unlink,unlinkat,rename,renameat -F auid>=1000
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-F auid!=unset -k delete
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- -a always,exit -F arch=b32 -S unlink,unlinkat,rename,renameat -F auid>=1000
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-F auid!=unset -k delete
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- comment: CIS 4.1.3.14 - Changes to the Mandatory Access Controls
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rule:
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- -w /etc/selinux/ -p wa -k MAC-policy
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- -w /usr/share/selinux/ -p wa -k MAC-policy
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- comment: CIS 4.1.3.19 - Kernel module loading unloading and modification
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rule:
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- -a always,exit -F arch=b64 -S finit_module,create_module,query_module -F auid>=1000
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-F auid!=unset -k kernel_modules
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- -a always,exit -F arch=b32 -S finit_module,create_module,query_module -F auid>=1000
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-F auid!=unset -k kernel_modules
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- -a always,exit -F arch=b64 -S init_module,delete_module -k kernel_modules
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- -a always,exit -F arch=b32 -S init_module,delete_module -k kernel_modules
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- -a always,exit -F path=/usr/bin/kmod -F perm=x -F auid>=1000 -F auid!=unset
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-k kernel_modules
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```
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### auditd_main_rules_extra
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#### Default value
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```YAML
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auditd_main_rules_extra: []
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```
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### auditd_max_log_file
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Maximum size of a single logfile (MB)
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#### Default value
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```YAML
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auditd_max_log_file: 10
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```
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### auditd_max_log_file_action
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#### Default value
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```YAML
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auditd_max_log_file_action: rotate
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```
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### auditd_num_logs
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Number of logs to keep
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#### Default value
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```YAML
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auditd_num_logs: 5
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```
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### auditd_optional_rules_default
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#### Default value
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```YAML
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auditd_optional_rules_default: []
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```
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### auditd_optional_rules_extra
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#### Default value
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```YAML
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auditd_optional_rules_extra: []
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```
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### auditd_reboot_on_change
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#### Default value
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```YAML
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auditd_reboot_on_change: false
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```
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### auditd_refuse_manual_stop
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This option prevents auditd from performing change/restart actions at runtime and requires a reboot instead.
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For security reasons, this option should only be disabled for testing purposes.
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#### Default value
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```YAML
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auditd_refuse_manual_stop: true
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```
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### auditd_space_left_action
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#### Default value
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```YAML
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auditd_space_left_action: email
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```
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## Dependencies
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None.
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## License
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MIT
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## Author
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[Robert Kaussow](https://gitea.rknet.org/xoxys)
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