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Linux Auditd Best Practice Configuration
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| # IMPORTANT! | |
| # This gist has been transformed into a github repo | |
| # You can find the most recent version there: | |
| # https://github.com/Neo23x0/auditd | |
| # ___ ___ __ __ | |
| # / | __ ______/ (_) /_____/ / | |
| # / /| |/ / / / __ / / __/ __ / | |
| # / ___ / /_/ / /_/ / / /_/ /_/ / | |
| # /_/ |_\__,_/\__,_/_/\__/\__,_/ | |
| # | |
| # Linux Audit Daemon - Best Practice Configuration | |
| # /etc/audit/audit.rules | |
| # | |
| # Compiled by Florian Roth | |
| # | |
| # Created : 2017/12/05 | |
| # Modified : 2018/08/05 | |
| # | |
| # 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 | |
| # 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 --------------------------------------------------------------------- | |
| ### We put these early because audit is a first match wins system. | |
| ## Ignore SELinux AVC records | |
| -a always,exclude -F msgtype=AVC | |
| ## Ignore current working directory records | |
| -a always,exclude -F msgtype=CWD | |
| ## Ignore EOE records (End Of Event, not needed) | |
| -a always,exclude -F msgtype=EOE | |
| ## Cron jobs fill the logs with stuff we normally don't want (works with SELinux) | |
| -a never,user -F subj_type=crond_t | |
| -a exit,never -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 | |
| ### High Volume Event Filter (especially on Linux Workstations) | |
| -a exit,never -F arch=b32 -F dir=/dev/shm -k sharedmemaccess | |
| -a exit,never -F arch=b64 -F dir=/dev/shm -k sharedmemaccess | |
| -a exit,never -F arch=b32 -F dir=/var/lock/lvm -k locklvm | |
| -a exit,never -F arch=b64 -F dir=/var/lock/lvm -k locklvm | |
| ## 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 | |
| -a always,exit -F perm=x -F auid!=-1 -F path=/sbin/insmod -k modules | |
| -a always,exit -F perm=x -F auid!=-1 -F path=/sbin/modprobe -k modules | |
| -a always,exit -F perm=x -F auid!=-1 -F path=/sbin/rmmod -k modules | |
| -a always,exit -F arch=b64 -S finit_module -S init_module -S delete_module -F auid!=-1 -k modules | |
| -a always,exit -F arch=b32 -S finit_module -S init_module -S delete_module -F auid!=-1 -k modules | |
| ## Modprobe configuration | |
| -w /etc/modprobe.conf -p wa -k modprobe | |
| ## KExec usage (all actions) | |
| -a always,exit -F arch=b64 -S kexec_load -k KEXEC | |
| -a always,exit -F arch=b32 -S sys_kexec_load -k KEXEC | |
| ## 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 (only attributable) | |
| -a always,exit -F arch=b64 -S mount -S umount2 -F auid!=-1 -k mount | |
| -a always,exit -F arch=b32 -S mount -S umount -S umount2 -F auid!=-1 -k mount | |
| # Change swap (only attributable) | |
| -a always,exit -F arch=b64 -S swapon -S swapoff -F auid!=-1 -k swap | |
| -a always,exit -F arch=b32 -S swapon -S swapoff -F auid!=-1 -k swap | |
| ## 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 | |
| ## 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 | |
| # Systemd | |
| -w /bin/systemctl -p x -k systemd | |
| -w /etc/systemd/ -p wa -k systemd | |
| ## 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 unauthedfileaccess | |
| -a exit,always -F arch=b64 -S open -F dir=/bin -F success=0 -k unauthedfileaccess | |
| -a exit,always -F arch=b64 -S open -F dir=/sbin -F success=0 -k unauthedfileaccess | |
| -a exit,always -F arch=b64 -S open -F dir=/usr/bin -F success=0 -k unauthedfileaccess | |
| -a exit,always -F arch=b64 -S open -F dir=/usr/sbin -F success=0 -k unauthedfileaccess | |
| -a exit,always -F arch=b64 -S open -F dir=/var -F success=0 -k unauthedfileaccess | |
| -a exit,always -F arch=b64 -S open -F dir=/home -F success=0 -k unauthedfileaccess | |
| -a exit,always -F arch=b64 -S open -F dir=/srv -F success=0 -k unauthedfileaccess | |
| ## 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 | |
| ## Reconnaissance | |
| -w /usr/bin/whoami -p x -k recon | |
| -w /etc/issue -p r -k recon | |
| -w /etc/hostname -p r -k recon | |
| ## Suspicious activity | |
| -w /usr/bin/wget -p x -k susp_activity | |
| -w /usr/bin/curl -p x -k susp_activity | |
| -w /usr/bin/base64 -p x -k susp_activity | |
| -w /bin/nc -p x -k susp_activity | |
| -w /bin/netcat -p x -k susp_activity | |
| -w /usr/bin/ncat -p x -k susp_activity | |
| -w /usr/bin/ssh -p x -k susp_activity | |
| -w /usr/bin/socat -p x -k susp_activity | |
| -w /usr/bin/wireshark -p x -k susp_activity | |
| -w /usr/bin/rawshark -p x -k susp_activity | |
| -w /usr/bin/rdesktop -p x -k sbin_susp | |
| ## Sbin suspicious activity | |
| -w /sbin/iptables -p x -k sbin_susp | |
| -w /sbin/ifconfig -p x -k sbin_susp | |
| -w /usr/sbin/tcpdump -p x -k sbin_susp | |
| -w /usr/sbin/traceroute -p x -k sbin_susp | |
| ## 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 | |
| # Software Management --------------------------------------------------------- | |
| # RPM (Redhat/CentOS) | |
| -w /usr/bin/rpm -p x -k software_mgmt | |
| -w /usr/bin/yum -p x -k software_mgmt | |
| # YAST/Zypper/RPM (SuSE) | |
| -w /sbin/yast -p x -k yast | |
| -w /sbin/yast2 -p x -k yast | |
| -w /bin/rpm -p x -k software_mgmt | |
| -w /usr/bin/zypper -k software_mgmt | |
| # DPKG / APT-GET (Debian/Ubuntu) | |
| -w /usr/bin/dpkg -p x -k software_mgmt | |
| -w /usr/bin/apt-add-repository -p x -k software_mgmt | |
| -w /usr/bin/apt-get -p x -k software_mgmt | |
| -w /usr/bin/aptitude -p x -k software_mgmt | |
| # Special Software ------------------------------------------------------------ | |
| ## GDS specific secrets | |
| -w /etc/puppet/ssl -p wa -k puppet_ssl | |
| ## IBM Bigfix BESClient | |
| -a exit,always -F arch=b64 -S open -F dir=/opt/BESClient -F success=0 -k soft_besclient | |
| -w /var/opt/BESClient/ -p wa -k soft_besclient | |
| ## CHEF https://www.chef.io/chef/ | |
| -w /etc/chef -p wa -k soft_chef | |
| # High volume events ---------------------------------------------------------- | |
| ## Remove them if the cause to much volumen in your einvironment | |
| ## 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 |
Please add -w /etc/modprobe.d/ -p wa -k modprobe
Really like this, thank you!
Muy bueno, muchas gracias :D desde CL
El vito también da las gracias
@gcallpa better use the new one https://github.com/Neo23x0/auditd
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Is there any way to monitor an indirect writing, like echo "/path/to/script.py" >> /home/test/.bash_profile , cause -w /home/test/.bash_profile -p wa is not working in that case and monitoring -S open produce a lot of falsepositives. The alternate way I found most flexible is to use AIDE instead.