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Linux Auditd Best Practice Configuration
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# Linux Audit Daemon - Best Practice Configuration | |
# /etc/audit/audit.rules | |
# | |
# Based on rules published here: | |
# Gov.uk auditd rules | |
# https://github.com/gds-operations/puppet-auditd/pull/1 | |
# CentOS 7 hardening | |
# https://highon.coffee/blog/security-harden-centos-7/#auditd---audit-daemon | |
# Linux audit repo | |
# https://github.com/linux-audit/audit-userspace/tree/master/rules | |
# Auditd high performance linux auditing | |
# https://linux-audit.com/tuning-auditd-high-performance-linux-auditing/ | |
# | |
# Further rules | |
# For PCI DSS compliance see: | |
# https://github.com/linux-audit/audit-userspace/blob/master/rules/30-pci-dss-v31.rules | |
# For NISPOM compliance see: | |
# https://github.com/linux-audit/audit-userspace/blob/master/rules/30-nispom.rules | |
# | |
# Compiled by Florian Roth | |
# 2017/12/05 | |
# Remove any existing rules | |
-D | |
# Buffer Size | |
## Feel free to increase this if the machine panic's | |
-b 8192 | |
# Failure Mode | |
## Possible values: 0 (silent), 1 (printk, print a failure message), 2 (panic, halt the system) | |
-f 1 | |
# Ignore errors | |
## e.g. caused by users or files not found in the local environment | |
-i | |
# Self Auditing --------------------------------------------------------------- | |
# Audit the audit logs | |
## Successful and unsuccessful attempts to read information from the audit records | |
-w /var/log/audit/ -k auditlog | |
# Auditd configuration | |
## Modifications to audit configuration that occur while the audit collection functions are operating | |
-w /etc/audit/ -p wa -k auditconfig | |
-w /etc/libaudit.conf -p wa -k auditconfig | |
-w /etc/audisp/ -p wa -k audispconfig | |
# Monitor for use of audit management tools | |
-w /sbin/auditctl -p x -k audittools | |
-w /sbin/auditd -p x -k audittools | |
# Filters --------------------------------------------------------------------- | |
# This is for don't audit rules. We put these early because audit | |
# is a first match wins system. | |
# Cron jobs fill the logs with stuff we normally don't want | |
-a never,user -F subj_type=crond_t | |
# This prevents chrony from overwhelming the logs | |
#-a never,exit -F arch=b64 -S adjtimex -F auid=unset -F uid=chrony -F subj_type=chronyd_t | |
# This is not very interesting and wastes a lot of space if the server is public facing | |
-a always,exclude -F msgtype=CRYPTO_KEY_USER | |
# VMWare tools | |
-a exit,never -F arch=b32 -S fork -F success=0 -F path=/usr/lib/vmware-tools -F subj_type=initrc_t -F exit=-2 | |
-a exit,never -F arch=b64 -S fork -F success=0 -F path=/usr/lib/vmware-tools -F subj_type=initrc_t -F exit=-2 | |
# More information on how to filter events | |
# https://access.redhat.com/solutions/2482221 | |
# Rules ----------------------------------------------------------------------- | |
# Kernel parameters | |
-w /etc/sysctl.conf -p wa -k sysctl | |
# 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 | |
-a always,exit -F arch=b64 -S init_module -S delete_module -k modules | |
# Modprobe configuration | |
-w /etc/modprobe.conf -p wa -k modprobe | |
# Special files | |
-a exit,always -F arch=b32 -S mknod -S mknodat -k specialfiles | |
-a exit,always -F arch=b64 -S mknod -S mknodat -k specialfiles | |
# Mount operations | |
-a exit,always -F arch=b32 -S mount -S umount -S umount2 -k mount | |
-a exit,always -F arch=b64 -S mount -S umount2 -k mount | |
# Time | |
-a exit,always -F arch=b32 -S adjtimex -S settimeofday -S clock_settime -k time | |
-a exit,always -F arch=b64 -S adjtimex -S settimeofday -S clock_settime -k time | |
## Local time zone | |
-w /etc/localtime -p wa -k localtime | |
# Stunnel | |
-w /usr/sbin/stunnel -p x -k stunnel | |
# Cron configuration & scheduled jobs | |
-w /etc/cron.allow -p wa -k cron | |
-w /etc/cron.deny -p wa -k cron | |
-w /etc/cron.d/ -p wa -k cron | |
-w /etc/cron.daily/ -p wa -k cron | |
-w /etc/cron.hourly/ -p wa -k cron | |
-w /etc/cron.monthly/ -p wa -k cron | |
-w /etc/cron.weekly/ -p wa -k cron | |
-w /etc/crontab -p wa -k cron | |
-w /var/spool/cron/crontabs/ -k cron | |
# User, group, password databases | |
-w /etc/group -p wa -k etcgroup | |
-w /etc/passwd -p wa -k etcpasswd | |
-w /etc/gshadow -k etcgroup | |
-w /etc/shadow -k etcpasswd | |
-w /etc/security/opasswd -k opasswd | |
# Sudoers file changes | |
-w /etc/sudoers -p wa -k actions | |
# Passwd | |
-w /usr/bin/passwd -p x -k passwd_modification | |
# Tools to change group identifiers | |
-w /usr/sbin/groupadd -p x -k group_modification | |
-w /usr/sbin/groupmod -p x -k group_modification | |
-w /usr/sbin/addgroup -p x -k group_modification | |
-w /usr/sbin/useradd -p x -k user_modification | |
-w /usr/sbin/usermod -p x -k user_modification | |
-w /usr/sbin/adduser -p x -k user_modification | |
# Login configuration and information | |
-w /etc/login.defs -p wa -k login | |
-w /etc/securetty -p wa -k login | |
-w /var/log/faillog -p wa -k login | |
-w /var/log/lastlog -p wa -k login | |
-w /var/log/tallylog -p wa -k login | |
# Network Environment | |
## Changes to hostname | |
-a always,exit -F arch=b32 -S sethostname -S setdomainname -k network_modifications | |
-a always,exit -F arch=b64 -S sethostname -S setdomainname -k network_modifications | |
## Changes to other files | |
-w /etc/hosts -p wa -k network_modifications | |
-w /etc/sysconfig/network -p wa -k network_modifications | |
-w /etc/network/ -p wa -k network | |
-a always,exit -F dir=/etc/NetworkManager/ -F perm=wa -k network_modifications | |
-w /etc/sysconfig/network -p wa -k network_modifications | |
## Changes to issue | |
-w /etc/issue -p wa -k etcissue | |
-w /etc/issue.net -p wa -k etcissue | |
# System startup scripts | |
-w /etc/inittab -p wa -k init | |
-w /etc/init.d/ -p wa -k init | |
-w /etc/init/ -p wa -k init | |
# Library search paths | |
-w /etc/ld.so.conf -p wa -k libpath | |
# Pam configuration | |
-w /etc/pam.d/ -p wa -k pam | |
-w /etc/security/limits.conf -p wa -k pam | |
-w /etc/security/pam_env.conf -p wa -k pam | |
-w /etc/security/namespace.conf -p wa -k pam | |
-w /etc/security/namespace.init -p wa -k pam | |
# GDS specific secrets | |
-w /etc/puppet/ssl -p wa -k puppet_ssl | |
# Postfix configuration | |
-w /etc/aliases -p wa -k mail | |
-w /etc/postfix/ -p wa -k mail | |
# SSH configuration | |
-w /etc/ssh/sshd_config -k sshd | |
# SELinux events that modify the system's Mandatory Access Controls (MAC) | |
-w /etc/selinux/ -p wa -k mac_policy | |
# Critical elements access failures | |
-a exit,always -F arch=b64 -S open -F dir=/etc -F success=0 -k unauthedfileacess | |
-a exit,always -F arch=b64 -S open -F dir=/bin -F success=0 -k unauthedfileacess | |
-a exit,always -F arch=b64 -S open -F dir=/sbin -F success=0 -k unauthedfileacess | |
-a exit,always -F arch=b64 -S open -F dir=/usr/bin -F success=0 -k unauthedfileacess | |
-a exit,always -F arch=b64 -S open -F dir=/usr/sbin -F success=0 -k unauthedfileacess | |
-a exit,always -F arch=b64 -S open -F dir=/var -F success=0 -k unauthedfileacess | |
-a exit,always -F arch=b64 -S open -F dir=/home -F success=0 -k unauthedfileacess | |
-a exit,always -F arch=b64 -S open -F dir=/srv -F success=0 -k unauthedfileacess | |
# Process ID change (switching accounts) applications | |
-w /bin/su -p x -k priv_esc | |
-w /usr/bin/sudo -p x -k priv_esc | |
-w /etc/sudoers -p rw -k priv_esc | |
# Power state | |
-w /sbin/shutdown -p x -k power | |
-w /sbin/poweroff -p x -k power | |
-w /sbin/reboot -p x -k power | |
-w /sbin/halt -p x -k power | |
# Session initiation information | |
-w /var/run/utmp -p wa -k session | |
-w /var/log/btmp -p wa -k session | |
-w /var/log/wtmp -p wa -k session | |
# Discretionary Access Control (DAC) modifications | |
-a always,exit -F arch=b32 -S chmod -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S chown -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S fchmod -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S fchmodat -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S fchown -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S fchownat -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S fremovexattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S fsetxattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S lchown -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S lremovexattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S lsetxattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S removexattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b32 -S setxattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S chmod -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S chown -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S fchmod -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S fchmodat -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S fchown -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S fchownat -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S fremovexattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S fsetxattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S lchown -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S lremovexattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S lsetxattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S removexattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
-a always,exit -F arch=b64 -S setxattr -F auid>=500 -F auid!=4294967295 -k perm_mod | |
# Special Rules --------------------------------------------------------------- | |
# 32bit API Exploitation | |
## If you are on a 64 bit platform, everything _should_ be running | |
## in 64 bit mode. This rule will detect any use of the 32 bit syscalls | |
## because this might be a sign of someone exploiting a hole in the 32 | |
## bit API. | |
-a always,exit -F arch=b32 -S all -k 32bit_api | |
# Injection | |
## These rules watch for code injection by the ptrace facility. | |
## This could indicate someone trying to do something bad or just debugging | |
#-a always,exit -F arch=b32 -S ptrace -k tracing | |
-a always,exit -F arch=b64 -S ptrace -k tracing | |
-a always,exit -F arch=b32 -S ptrace -F a0=0x4 -k code_injection | |
-a always,exit -F arch=b64 -S ptrace -F a0=0x4 -k code_injection | |
-a always,exit -F arch=b32 -S ptrace -F a0=0x5 -k data_injection | |
-a always,exit -F arch=b64 -S ptrace -F a0=0x5 -k data_injection | |
-a always,exit -F arch=b32 -S ptrace -F a0=0x6 -k register_injection | |
-a always,exit -F arch=b64 -S ptrace -F a0=0x6 -k register_injection | |
# Privilege Abuse | |
## The purpose of this rule is to detect when an admin may be abusing power by looking in user's home dir. | |
-a always,exit -F dir=/home -F uid=0 -F auid>=1000 -F auid!=4294967295 -C auid!=obj_uid -k power_abuse | |
# High volume events ---------------------------------------------------------- | |
# Root command executions | |
-a exit,always -F arch=b64 -F euid=0 -S execve -k rootcmd | |
-a exit,always -F arch=b32 -F euid=0 -S execve -k rootcmd | |
# File Deletion Events by User | |
-a always,exit -F arch=b32 -S rmdir -S unlink -S unlinkat -S rename -S renameat -F auid>=500 -F auid!=4294967295 -k delete | |
-a always,exit -F arch=b64 -S rmdir -S unlink -S unlinkat -S rename -S renameat -F auid>=500 -F auid!=4294967295 -k delete | |
# File Access | |
## Unauthorized Access (unsuccessful) | |
-a always,exit -F arch=b32 -S creat -S open -S openat -S open_by_handle_at -S truncate -S ftruncate -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k file_access | |
-a always,exit -F arch=b32 -S creat -S open -S openat -S open_by_handle_at -S truncate -S ftruncate -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k file_access | |
-a always,exit -F arch=b64 -S creat -S open -S openat -S open_by_handle_at -S truncate -S ftruncate -F exit=-EACCES -F auid>=500 -F auid!=4294967295 -k file_access | |
-a always,exit -F arch=b64 -S creat -S open -S openat -S open_by_handle_at -S truncate -S ftruncate -F exit=-EPERM -F auid>=500 -F auid!=4294967295 -k file_access | |
## Unsuccessful Creation | |
-a always,exit -F arch=b32 -S creat,link,mknod,mkdir,symlink,mknodat,linkat,symlinkat -F exit=-EACCES -k file_creation | |
-a always,exit -F arch=b64 -S mkdir,creat,link,symlink,mknod,mknodat,linkat,symlinkat -F exit=-EACCES -k file_creation | |
-a always,exit -F arch=b32 -S link,mkdir,symlink,mkdirat -F exit=-EPERM -k file_creation | |
-a always,exit -F arch=b64 -S mkdir,link,symlink,mkdirat -F exit=-EPERM -k file_creation | |
## Unsuccessful Modification | |
-a always,exit -F arch=b32 -S rename -S renameat -S truncate -S chmod -S setxattr -S lsetxattr -S removexattr -S lremovexattr -F exit=-EACCES -k file_modification | |
-a always,exit -F arch=b64 -S rename -S renameat -S truncate -S chmod -S setxattr -S lsetxattr -S removexattr -S lremovexattr -F exit=-EACCES -k file_modification | |
-a always,exit -F arch=b32 -S rename -S renameat -S truncate -S chmod -S setxattr -S lsetxattr -S removexattr -S lremovexattr -F exit=-EPERM -k file_modification | |
-a always,exit -F arch=b64 -S rename -S renameat -S truncate -S chmod -S setxattr -S lsetxattr -S removexattr -S lremovexattr -F exit=-EPERM -k file_modification | |
# Make the configuration immutable -------------------------------------------- | |
#-e 2 |
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