[ LINUX FORENSICS & COMPLIANCE ]

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.

[ SPECIFICATION // SECURITY ]: Linux Audit Daemon configuration generator processed 100% locally in-browser. Generates immutable audit rules (-e 2) for execve syscall monitoring, file tracking, and privilege escalation auditing.
Standard: Linux Audit Subsystem (auditd / kauditd) [ VERIFIED // LOCAL EXECUTION ][ ZERO TELEMETRY ][ OFFLINE PWA ][ OPEN SOURCE // MIT ]
Telemetry Rate & System Impact
Est. ~45 events/sec · ~120 MB/day
[ BALANCED COMPLIANCE ]

[ 1. BUFFER & KERNEL CONTROL FLAGS ]

Size of the kernel netlink audit queue buffer to prevent message drops under high load.

[ SUBSYSTEM WATCH DIRECTIVES ]

[ 2. LIVE CONFIGURATION OUTPUT ]

# Generating Linux Auditd configuration...
[ IMMUTABILITY NOTE ]: When -e 2 is active, rules are locked into kernel memory until next reboot.

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
[ DEEP DIVE ARCHITECTURE // DFIR ]

Linux Auditd Kernel Event Monitoring & DFIR Logging Blueprint

Explore kauditd kernel streaming architecture, ring buffer tuning, and high-throughput DFIR audit log aggregation using Vector and ClickHouse.

Read Complete Auditd Guide ->DFIR Logging with ClickHouse ->

Frequently Asked Questions (FAQ)

What is the purpose of the -e 2 flag in Linux auditd configuration?
The -e 2 flag locks the auditd configuration into immutable mode. Once enabled, kernel audit rules cannot be altered or disabled by any process (even by root) without rebooting the server.
Why is adjusting the auditd backlog buffer (-b) critical?
The backlog buffer sets the kernel audit event queue capacity during high I/O spikes. If the backlog is undersized during sudden traffic surges, critical security audit events will be dropped.
Are the generated auditd rules safe for production environments?
Yes, configuration presets are tuned to minimize kernel CPU overhead by focusing auditing specifically on critical syscalls like execve, ptrace, and system configuration modifications.
How do I apply the generated auditd rules on Linux?
Copy the generated rule snippet to /etc/audit/rules.d/audit.rules and execute 'augenrules --load' or restart the auditd service.
Copied to clipboard!