SECURITY

autotoc_md2318

doc_id: "LOG-SECU-003" doc_title: "Security Guide" doc_version: "1.0.0" doc_date: "2026-04-04" doc_status: "Released" project: "logger_system"

category: "SECU"

‍Language: English | 한국어

Security Guide

‍SSOT: This document is the single source of truth for Security Guide.

This document outlines the current security posture of the logger_system and provides guidance for secure deployments.

Threat Model (Scope)

• Sensitive data can accidentally enter logs (PII, credentials, API keys).
• Logs may be stored on shared disks or shipped over networks to central collectors.
• Attackers may read, tamper with, or replay logs if not adequately protected.

Current Capabilities

• Sanitization: log_sanitizer and sanitizing_filter can redact common sensitive patterns (credit cards, SSN, email, IP, API keys, passwords) and support custom rules.
• Access control filter: Restrict logging based on file patterns, user context, and log levels.

Important Limitations

• No built-in encryption writer. For production encryption, integrate a vetted crypto library (see recommendations below).
• No built-in TLS for the network_writer/log_server. Traffic is plaintext by default.
• Authentication/authorization for the log_server is not implemented.

Recommendations (Production)

1. Sanitization First
   • Enable log_sanitizer or wrap a sanitizing_filter early in your logging pipeline.
   • Add organization-specific rules (e.g., JWT, internal tokens, ticket numbers).
2. Encryption at Rest
   • Implement encryption using a vetted crypto library (e.g., OpenSSL, libsodium, Botan).
   • Use authenticated encryption (AES-GCM or ChaCha20-Poly1305).
   • Rotate keys periodically and store them in a secure vault (OS keychain, KMS, HSM). Never commit keys.
   • Example: Create a custom writer that wraps file_writer and encrypts data before writing.
3. Encryption in Transit
   • Prefer shipping logs over a secure transport (mTLS, TLS termination at a proxy, or a syslog/OTLP exporter with TLS).
   • If extending network_writer, add TLS support and certificate pinning where feasible.
4. Server Hardening
   • Place log_server behind a reverse proxy with TLS and auth, or embed authN/Z in the server.
   • Rate-limit and validate inputs; drop malformed frames.
   • Apply least-privilege for filesystem and network permissions.
5. Data Retention and Compliance
   • Define retention windows; rotate and purge logs on schedule.
   • Anonymize or pseudonymize PII where possible.
   • Ensure compliance with applicable regulations (e.g., GDPR, HIPAA).
6. Observability
   • Use logger_metrics to monitor drop rates, queue utilization, and writer failures.
   • Alert on abnormal spikes in error-level logs or sanitization hits.

Secure Configuration Checklist

• Sanitization rules enabled and customized.

• No secrets or credentials in log messages or formats.

• Transport encryption (TLS/mTLS) for any remote log shipping.

• Encryption at rest for sensitive logs, using authenticated encryption.

• Keys stored in a secure vault; rotation policy defined.

• Access control policies defined for sensitive sources and users.

• Retention and rotation configured; old logs purged securely.

• Server behind TLS/auth and with rate limits.

Roadmap

• Optional TLS support for network_writer/log_server.
• Pluggable crypto provider interface for at-rest encryption.
• Policy-driven sanitizer configuration (YAML/JSON).

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Last Updated: 2025-10-20