algo/roles/privacy

Privacy Enhancements Role

This Ansible role implements additional privacy enhancements for Algo VPN to minimize server-side traces of VPN usage and reduce log retention. These measures help protect user privacy while maintaining system security.

Features

1. Aggressive Log Rotation

• Configures shorter log retention periods (default: 7 days)
• Implements more frequent log rotation
• Compresses rotated logs to save space
• Automatically cleans up old log files

2. History Clearing

• Clears bash/shell history after deployment
• Disables persistent command history for system users
• Clears temporary files and caches
• Sets up automatic history clearing on user logout

3. VPN Log Filtering

• Filters out VPN connection logs from rsyslog
• Excludes WireGuard and StrongSwan messages from persistent storage
• Filters kernel messages related to VPN traffic
• Optional filtering of authentication logs (use with caution)

4. Automatic Cleanup

• Daily/weekly/monthly cleanup of old logs and temporary files
• Package cache cleaning
• Configurable retention policies
• Optional shutdown cleanup for extreme privacy

5. Advanced Privacy Settings

• Reduced kernel log verbosity
• Disabled successful SSH connection logging (optional)
• Volatile systemd journal storage
• Privacy monitoring script

Configuration

All privacy settings are configured in config.cfg under the "Privacy Enhancements" section:

# Enable/disable all privacy enhancements
privacy_enhancements_enabled: true

# Log rotation settings
privacy_log_rotation:
  max_age: 7              # Days to keep logs
  max_size: 10            # Max size per log file (MB)
  rotate_count: 3         # Number of rotated files to keep
  compress: true          # Compress rotated logs
  daily_rotation: true    # Force daily rotation

# History clearing
privacy_history_clearing:
  clear_bash_history: true
  clear_system_history: true
  disable_service_history: true

# Log filtering
privacy_log_filtering:
  exclude_vpn_logs: true
  exclude_auth_logs: false    # Use with caution
  filter_kernel_vpn_logs: true

# Automatic cleanup
privacy_auto_cleanup:
  enabled: true
  frequency: "daily"          # daily, weekly, monthly
  temp_files_max_age: 1
  clean_package_cache: true

# Advanced settings
privacy_advanced:
  disable_ssh_success_logs: false
  reduce_kernel_verbosity: true
  clear_logs_on_shutdown: false  # Extreme measure

Security Considerations

Safe Settings (Default)

• exclude_vpn_logs: true - Safe, only filters VPN-specific messages
• clear_bash_history: true - Safe, improves privacy without affecting security
• reduce_kernel_verbosity: true - Safe, reduces noise in logs

Use With Caution

• exclude_auth_logs: true - Reduces security logging, makes incident investigation harder
• disable_ssh_success_logs: true - Removes audit trail for successful connections
• clear_logs_on_shutdown: true - Extreme measure, makes debugging very difficult

Files Created

Configuration Files

• /etc/logrotate.d/99-privacy-enhanced - Main log rotation config
• /etc/logrotate.d/99-auth-privacy - Auth log rotation
• /etc/logrotate.d/99-kern-privacy - Kernel log rotation
• /etc/rsyslog.d/49-privacy-vpn-filter.conf - VPN log filtering
• /etc/rsyslog.d/48-privacy-kernel-filter.conf - Kernel log filtering
• /etc/rsyslog.d/47-privacy-auth-filter.conf - Auth log filtering (optional)
• /etc/rsyslog.d/46-privacy-ssh-filter.conf - SSH log filtering (optional)
• /etc/rsyslog.d/45-privacy-minimal.conf - Minimal logging config

Scripts

• /usr/local/bin/privacy-auto-cleanup.sh - Automatic cleanup script
• /usr/local/bin/privacy-log-cleanup.sh - Initial log cleanup
• /usr/local/bin/privacy-monitor.sh - Privacy status monitoring
• /etc/bash.bash_logout - History clearing on logout

Systemd Services

• /etc/systemd/system/privacy-shutdown-cleanup.service - Shutdown cleanup (optional)

Usage

Enable Privacy Enhancements

Privacy enhancements are enabled by default. To disable them:

privacy_enhancements_enabled: false

Run Specific Privacy Tasks

You can run specific privacy components using tags:

# Run only log rotation setup
ansible-playbook server.yml --tags privacy-logs

# Run only history clearing
ansible-playbook server.yml --tags privacy-history

# Run only log filtering
ansible-playbook server.yml --tags privacy-filtering

# Run only cleanup tasks
ansible-playbook server.yml --tags privacy-cleanup

# Run all privacy enhancements
ansible-playbook server.yml --tags privacy

Monitor Privacy Status

Check the status of privacy enhancements:

sudo /usr/local/bin/privacy-monitor.sh

Manual Cleanup

Run manual cleanup:

sudo /usr/local/bin/privacy-auto-cleanup.sh

Debugging

If you need to debug VPN issues, temporarily disable privacy enhancements:

1. Set privacy_enhancements_enabled: false in config.cfg
2. Re-run the deployment: ./algo
3. Debug your issues with full logging
4. Re-enable privacy enhancements when done

Alternatively, disable specific features:

• Set exclude_vpn_logs: false to see VPN connection logs
• Set reduce_kernel_verbosity: false for full kernel logging
• Check /var/log/privacy-cleanup.log for cleanup operation logs

Impact on System

Positive Effects

• Improved user privacy
• Reduced disk usage from logs
• Faster log searches
• Reduced attack surface

Potential Drawbacks

• Limited debugging information
• Shorter audit trail
• May complicate troubleshooting
• Could hide security incidents

Compatibility

• Ubuntu 22.04: Fully supported
• FreeBSD: Limited support (log rotation and history clearing only)
• Other distributions: May require adaptation

Best Practices

1. Start Conservative: Use default settings initially
2. Test Thoroughly: Verify VPN functionality after enabling privacy features
3. Monitor Logs: Check that essential security logs are still being captured
4. Document Changes: Keep track of privacy settings for troubleshooting
5. Regular Reviews: Periodically review privacy settings and their effectiveness

Privacy vs. Security Balance

This role aims to balance privacy with security by:

• Keeping security-critical logs (authentication failures, system errors)
• Filtering only VPN-specific operational logs
• Providing granular control over what gets filtered
• Maintaining essential audit trails while reducing VPN usage traces

For maximum privacy, consider running your own log analysis before enabling aggressive filtering options.