Linux Auditd & DFIR Rule Generator
Generate production Linux kernel auditd rulesets (audit.rules), daemon configurations (auditd.conf), and DFIR ausearch queries aligned with CIS Benchmark and PCI-DSS 100% offline.
[ 1. COMPLIANCE & THREAT PROFILES ]
[ 2. BUFFER & KERNEL CONTROL FLAGS ]
# Generating Linux Auditd configuration...
-e 2 is active, the audit configuration is locked in kernel memory. Any attempt to modify or delete rules via auditctl will be rejected until the system is rebooted.
Architecture: Linux Kernel Audit Subsystem & DFIR Telemetry
The Linux Audit Framework (auditd) operates at the kernel boundary via a dedicated Netlink socket, intercepting system calls before execution and generating high-integrity security telemetry. Unlike user-space logging daemons (such as standard syslog), kernel audit events cannot be bypassed by unprivileged users or stripped from process memory.
Key Audit Ruleset Dimensions
Process Injection & ptrace Defense
Attackers frequently use ptrace or memory dumping tools to extract credentials from memory (e.g. LSASS or SSH keys). Auditing ptrace, process_vm_readv, and process_vm_writev triggers immediate forensic alerts when unprivileged processes attempt inter-process memory inspection.
Immutable Kernel Lock (-e 2)
Placing -e 2 as the final line in /etc/audit/rules.d/audit.rules locks the audit configuration permanently in kernel space. Even an attacker who achieves full root privileges cannot disable the audit daemon or clear the active rule table without a hardware reboot.
Forensic Investigation with ausearch & aureport
Query audit logs efficiently using key tags without parsing raw log files:
# Search all unauthorized file access failures:
$ sudo ausearch --success no --interpret
# Search for all executions tagged with 'exec_commands':
$ sudo ausearch -k exec_commands --interpret
# Generate an executive forensic summary of authentication events:
$ sudo aureport --auth --summary
# Track changes to user identities and passwords:
$ sudo ausearch -k identity -ts today