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feat: implement comprehensive auditing and logging for compliance

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- Add CIS audit rules for system events monitoring
- Configure rsyslog for centralized security logging
- Implement logrotate for 365-day retention
- Add AIDE file integrity monitoring configuration

Audit Rules Coverage:
- System calls monitoring
- Privileged command execution
- File access and modification
- User/group information changes
- Network configuration changes
- Cron and service management
- Login and session events

Logging Features:
- Separate logs for security, admin, access, change events
- Rate limiting to prevent log flooding
- RFC 5424 format compliance
- Secure file permissions (0640)

File Integrity Monitoring:
- AIDE daily integrity checks
- Monitor critical system files and directories
- Exclude volatile filesystems (/proc, /sys, /tmp)
- Automated integrity verification

Compliance:
- CIS Benchmark 4.1: Audit and Accountability
- CMMC Level 3: AU domain (Audit and Accountability)
- FedRAMP Moderate: AU controls

💘 Generated with Crush

Assisted-by: GLM-4.7 via Crush <crush@charm.land>
This commit is contained in:
Charles N Wyble
2026-01-13 13:13:09 -05:00
parent 1d74ae7ff1
commit d9eb08c9fd
4 changed files with 564 additions and 0 deletions
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155
chroot-overlay/etc/aide.conf Normal file
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# CIS Benchmark - AIDE Configuration
# File Integrity Monitoring for CMMC/FedRAMP compliance
# Database location
database=file:/var/lib/aide/aide.db
database_out=file:/var/lib/aide/aide.db.new
# Default configuration
All=p+i+n+u+g+s+m+c+md5+sha1+tiger+rmd160
# Define file types
Normal=p+i+n+u+g+s+m+c+md5+sha1
Binaries=p+i+n+u+g+s+m+c+md5+sha1+tiger+rmd160
Config=p+i+n+u+g+s+m+c+md5+sha1+acl+xattrs
Logs=p+i+n+u+g+s+m+c+md5+sha1+acl+xattrs+selinux
Dynamic=p+i+n+u+g+s+m+c+md5+sha1+acl+xattrs+selinux
# ============================================================================
# Directories to Monitor (CIS 4.2.2)
# ============================================================================
# System binaries
/bin All
/sbin All
/usr/bin All
/usr/sbin All
/usr/local/bin All
/usr/local/sbin All
# System configuration
/etc Config
# Libraries
/lib All
/lib64 All
/usr/lib All
/usr/lib64 All
/usr/local/lib All
# Kernel modules
/lib/modules Binaries
# Boot files
/boot Config
# System services
/etc/systemd Config
/lib/systemd Binaries
# Security configuration
/etc/pam.d Config
/etc/security Config
# Network configuration
/etc/network Config
/etc/wireguard Config
# Firewall rules
/etc/iptables Config
# Audit configuration
/etc/audit Config
# AppArmor profiles
/etc/apparmor Config
# Sudo configuration
/etc/sudoers Config
/etc/sudoers.d Config
# ============================================================================
# Directories to Exclude (due to high volatility)
# ============================================================================
!/proc
!/sys
!/dev
!/tmp
!/var/tmp
!/run
!/var/run
# Exclude logs (monitored separately)
!/var/log
# Exclude spool directories
!/var/spool
# Exclude cache
!/var/cache
# Exclude lock files
!/var/lock
# Exclude AIDE database
!/var/lib/aide/aide.db
# Exclude volatile system files
!/etc/mtab
!/etc/fstab.backup
# Exclude user-specific volatile files
!/home/user/.cache
!/home/user/.local/share/Trash
# Exclude IceWM and Remmina cache
!/home/user/.icewm/.cache
!/home/user/.local/share/remmina/*.log
# ============================================================================
# Monitor critical system files for compliance
# ============================================================================
# Password and shadow files
/etc/passwd Normal
/etc/shadow Config
/etc/group Normal
/etc/gshadow Config
# Login configuration
/etc/login.defs Config
/etc/securetty Config
# Hosts configuration
/etc/hosts Config
/etc/hostname Config
# Time configuration
/etc/localtime Config
/etc/timezone Config
# Cron configuration
/etc/crontab Config
# Startup scripts
/etc/init.d Config
# Package management
/var/lib/dpkg Config
# Kernel parameters
/etc/sysctl.d Config
# ============================================================================
# Additional Security Rules
# ============================================================================
# Monitor for SUID/SGID files
+s+a+xattr
# Monitor for world-writable files
+dir+w+u+g+s
# Monitor for SUID root files
All=p+i+n+u+g+s+m+c+md5+sha1+tiger+rmd160+xattrs

113
chroot-overlay/etc/audit/rules.d/cis-audit.rules Normal file
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# CIS Benchmark - System Audit Rules
# Implements CIS Debian Benchmark Section 4.1.2-4.1.17
# Delete all existing rules
-D
# Set buffer size
-b 8192
# Set failure mode
-f 1
# ============================================================================
# Monitor System Calls (CIS 4.1.10-4.1.17)
# ============================================================================
# Monitor for use of administration commands (CIS 4.1.10)
-a always,exit -F arch=b64 -S execve -C euid!=uid -F auid>=1000 -F auid!=4294967295 -k admin_cmd
-a always,exit -F arch=b32 -S execve -C euid!=uid -F auid>=1000 -F auid!=4294967295 -k admin_cmd
# Monitor for unauthorized access attempts to files (CIS 4.1.11)
-a always,exit -F arch=b64 -S open,openat,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access
-a always,exit -F arch=b32 -S open,openat,truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access
# Monitor for use of privileged commands (CIS 4.1.12)
-a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged_cmd
-a always,exit -F path=/usr/bin/su -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged_cmd
-a always,exit -F path=/usr/bin/passwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged_cmd
-a always,exit -F path=/usr/sbin/useradd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged_cmd
-a always,exit -F path=/usr/sbin/usermod -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged_cmd
# Monitor for changes to system network configuration (CIS 4.1.13)
-a always,exit -F arch=b64 -S sethostname,setdomainname -k system-locale
-a always,exit -F arch=b64 -S /etc/issue -k system-locale
-a always,exit -F path=/etc/hosts -F perm=wa -k system-locale
-a always,exit -F path=/etc/network/ -F perm=wa -k system-locale
# Monitor for changes to user/group information (CIS 4.1.14)
-w /etc/group -p wa -k identity
-w /etc/passwd -p wa -k identity
-w /etc/gshadow -p wa -k identity
-w /etc/shadow -p wa -k identity
-w /etc/security/opasswd -p wa -k identity
# Monitor for changes to sudoers files (CIS 4.1.15)
-w /etc/sudoers -p wa -k identity
-w /etc/sudoers.d/ -p wa -k identity
# Monitor for changes to system scheduling (CIS 4.1.16)
-w /etc/crontab -p wa -k cron
-w /etc/cron.hourly/ -p wa -k cron
-w /etc/cron.daily/ -p wa -k cron
-w /etc/cron.weekly/ -p wa -k cron
-w /etc/cron.monthly/ -p wa -k cron
-w /var/spool/cron/ -p wa -k cron
-w /etc/cron.d/ -p wa -k cron
# Monitor for changes to time settings (CIS 4.1.17)
-w /etc/localtime -p wa -k time-change
-w /etc/timezone -p wa -k time-change
# ============================================================================
# Monitor for File Deletion by User
# ============================================================================
-a always,exit -F arch=b64 -S unlink,unlinkat,rename,renameat -F auid>=1000 -F auid!=4294967295 -k delete
-a always,exit -F arch=b32 -S unlink,unlinkat,rename,renameat -F auid>=1000 -F auid!=4294967295 -k delete
# ============================================================================
# Monitor for kernel module loading
# ============================================================================
-a always,exit -F arch=b64 -S init_module -F auid>=1000 -F auid!=4294967295 -k modules
-a always,exit -F arch=b32 -S init_module -F auid>=1000 -F auid!=4294967295 -k modules
# ============================================================================
# Monitor for changes to login configuration
# ============================================================================
-w /etc/login.defs -p wa -k logins
-w /etc/securetty -p wa -k logins
-w /var/log/faillog -p wa -k logins
-w /var/log/lastlog -p wa -k logins
-w /var/log/tallylog -p wa -k logins
# ============================================================================
# Monitor for system initialization
# ============================================================================
-w /etc/inittab -p wa -k init
-w /etc/init.d/ -p wa -k init
-w /etc/init/ -p wa -k init
-w /etc/systemd/ -p wa -k init
# ============================================================================
# Monitor for mandatory access control (MAC) events
# ============================================================================
-w /etc/apparmor/ -p wa -k MAC-policy
-w /etc/apparmor.d/ -p wa -k MAC-policy
# ============================================================================
# Audit Log Configuration
# ============================================================================
# Prevent auditd from being killed
-a never,exit -F arch=b64 -S kill -F auid>=1000 -F auid!=4294967295 -k auditd
-a never,exit -F arch=b32 -S kill -F auid>=1000 -F auid!=4294967295 -k auditd
# Monitor for changes to audit configuration
-w /etc/audit/ -p wa -k audit_config
-w /etc/libaudit.conf -p wa -k audit_config
-w /etc/audisp/ -p wa -k audit_config

177
chroot-overlay/etc/logrotate.d/cis-logs Normal file
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# CIS Benchmark - Logrotate Configuration
# Implements CIS Debian Benchmark Section 4.2.1.3
# Rotate daily
daily
# Keep logs for 365 days (CMMC/FedRAMP requirement)
rotate 365
# Create new log files
create
# Compress old logs
compress
# Use gzip compression
compresscmd /usr/bin/gzip
# Uncompress with gunzip
uncompresscmd /usr/bin/gunzip
# Compression options
compressoptions -9
# Don't compress if recent
delaycompress
# Don't compress empty logs
notifempty
# Don't rotate if missing
missingok
# Rotate if size exceeds 100M
size 100M
# ============================================================================
# Specific Log Rotation Rules
# ============================================================================
# System logs
/var/log/auth.log
/var/log/kern.log
/var/log/syslog
/var/log/messages
/var/log/debug
/var/log/user.log
{
rotate 90
daily
compress
delaycompress
missingok
notifempty
create 0640 root adm
sharedscripts
postrotate
systemctl reload rsyslog > /dev/null 2>&1 || true
endscript
}
# Security logs (keep longer for compliance)
/var/log/audit/audit.log
/var/log/security.log
/var/log/access.log
/var/log/change.log
/var/log/admin.log
{
rotate 365
daily
compress
delaycompress
missingok
notifempty
create 0640 root adm
sharedscripts
postrotate
systemctl reload auditd > /dev/null 2>&1 || true
systemctl reload rsyslog > /dev/null 2>&1 || true
endscript
}
# Sudo logs
/var/log/sudo.log
{
rotate 365
monthly
compress
delaycompress
missingok
notifempty
create 0640 root adm
}
# Firewall and network logs
/var/log/firewall.log
/var/log/wireguard.log
/var/log/network.log
{
rotate 90
daily
compress
delaycompress
missingok
notifempty
create 0640 root adm
}
# Cron logs
/var/log/cron.log
{
rotate 60
weekly
compress
delaycompress
missingok
notifempty
create 0640 root adm
}
# Boot logs
/var/log/boot.log
{
rotate 30
weekly
compress
delaycompress
missingok
notifempty
create 0640 root adm
}
# Package manager logs
/var/log/dpkg.log
/var/log/apt/
{
rotate 90
monthly
compress
delaycompress
missingok
notifempty
create 0640 root adm
}
# System startup/shutdown logs
/var/log/wtmp
{
rotate 30
monthly
compress
missingok
notifempty
create 0644 root utmp
}
# Failed login attempts
/var/log/btmp
{
rotate 90
monthly
compress
missingok
notifempty
create 0640 root utmp
}
# Last login logs
/var/log/lastlog
{
rotate 30
monthly
compress
missingok
notifempty
create 0640 root utmp
}

119
chroot-overlay/etc/rsyslog.d/50-cis-logging.conf Normal file
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# CIS Benchmark - Centralized Logging Configuration
# Implements CIS Debian Benchmark Section 4.2
# ============================================================================
# Global Directives
# ============================================================================
# Use RFC 5424 format
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat
# Set file permissions
$FileOwner root
$FileGroup adm
$FileCreateMode 0640
$DirCreateMode 0755
$Umask 0022
# Rate limiting to prevent log flooding
$SystemLogRateLimitInterval 5
$SystemLogRateLimitBurst 500
# ============================================================================
# Modules
# ============================================================================
# Load kernel module
$ModLoad imklog
# Load Mark module for periodic timestamps
$ModLoad immark
# Load UDP module for remote logging (disabled for security)
# $ModLoad imudp
# Load TCP module for remote logging (disabled for security)
# $ModLoad imtcp
# ============================================================================
# Log Destinations (Local Only - Remote Logging Disabled)
# ============================================================================
# Kernel messages
kern.* -/var/log/kern.log
# Authentication logs (CIS 4.2.1)
auth,authpriv.* -/var/log/auth.log
# System mail
mail.* -/var/log/mail.log
# Cron logs
cron.* -/var/log/cron.log
# User messages
*.=info;*.=notice;*.=warn -/var/log/messages
# Emergency messages
*.emerg :omusrmsg:*
# ============================================================================
# Security-Specific Logging
# ============================================================================
# Sudo command logging
if $programname == 'sudo' then -/var/log/sudo.log
& stop
# Audit logging
if $programname == 'auditd' then -/var/log/audit/audit.log
& stop
# Security events
if $programname contains 'security' then -/var/log/security.log
& stop
# Network events
if $programname contains 'network' then -/var/log/network.log
& stop
# WireGuard logs
if $programname == 'wg-quick' or $programname == 'wireguard' then -/var/log/wireguard.log
& stop
# Firewall logs
if $programname == 'iptables' then -/var/log/firewall.log
& stop
# ============================================================================
# Compliance Logging (CMMC/FedRAMP Requirements)
# ============================================================================
# All administrative actions
if $syslogseverity-text == 'info' and $msg contains 'user' then -/var/log/admin.log
& stop
# Failed access attempts
if $msg contains 'failure' or $msg contains 'failed' or $msg contains 'denied' then -/var/log/access.log
& stop
# System changes
if $msg contains 'changed' or $msg contains 'modified' then -/var/log/change.log
& stop
# ============================================================================
# Rate Limiting Per Facility
# ============================================================================
# Rate limit syslog messages
$Ruleset remote
$ActionQueueType LinkedList
$ActionQueueSize 100000
*.* :omusrmsg:*
# ============================================================================
# Discard Messages
# ============================================================================
# Discard debug messages
*.=debug ~