HeliosDB-Lite v3.0.0 Security Hardening Guide¶

Version: 3.0.0 Status: Production Ready Last Updated: December 4, 2025

Table of Contents¶

Overview
Network Security
Authentication & Authorization
Data Encryption
Access Control
Error Handling & Logging
Deployment Security
Monitoring & Alerting
Security Checklist
Known Limitations

Overview¶

HeliosDB-Lite is a high-performance embedded database optimized for AI workloads. This guide covers security hardening practices for production deployments.

Security Architecture¶

Embedded Model: Runs within your application process (shared memory space)
No Network Protocol: Direct in-process API calls
PostgreSQL Compatible: SQL interface using PostgreSQL protocol compliance
Rate Limiting: Built-in rate limiting middleware for API protection

Threat Model¶

Protected Against: - ✅ External network attacks (no network interface) - ✅ Rate-based attacks (rate limiting enabled) - ✅ Concurrent access issues (MVCC transaction isolation) - ✅ Data corruption (WAL and crash recovery) - ✅ Unauthorized table access (access control)

Design Assumptions: - Application layer provides authentication - Network layer is protected (firewall/VPC) - Host access is controlled - Operating system is patched

Network Security¶

1. Embedded Deployment (Default)¶

HeliosDB-Lite runs embedded within your application:

use heliosdb_lite::HeliosDB;

// In-process only - no network exposure
let db = HeliosDB::new("./data")?;
let result = db.query("SELECT * FROM users")?;

Security: - ✅ No external network attack surface - ✅ Direct memory access only - ✅ Isolation through process boundaries

2. REST API Protection¶

When exposing via REST API, implement these controls:

use heliosdb_lite::api::RateLimitConfig;

// Configure rate limiting
let rate_config = RateLimitConfig {
    max_requests: 1000,      // requests per window
    window_duration: Duration::from_secs(60),
    burst_capacity: 100,
    key_extractor: "client_ip", // rate limit by IP
};

Implementation: - Place behind API gateway with authentication - Enable HTTPS/TLS for all connections - Implement rate limiting (enabled by default) - Use VPC/network isolation - Enable CORS restrictions

Authentication & Authorization¶

1. Application-Level Authentication¶

HeliosDB-Lite does not provide authentication. Implement at application layer:

// Example: Verify user token before database access
async fn get_user_data(auth_header: &str, db: &HeliosDB) -> Result<Vec<Row>> {
    let user_id = verify_jwt_token(auth_header)?;

    // Query data for authenticated user only
    db.query(&format!("SELECT * FROM users WHERE id = {}", user_id))
}

Best Practices: - Use JWT or OAuth2 tokens - Validate all requests - Implement request signing - Rotate credentials regularly

2. Data-Level Access Control¶

Implement row-level security (RLS) in application:

-- Application enforces user_id filter
SELECT * FROM documents WHERE user_id = $1 AND deleted_at IS NULL;

3. Administrative Access¶

Restrict administrative operations:

// Only allow admin role to execute DDL
if !user.has_role("admin") {
    return Err("Unauthorized: DDL requires admin role");
}

db.execute("CREATE TABLE audit_log (...)")?;

Data Encryption¶

1. At-Rest Encryption¶

HeliosDB-Lite stores data in data files. Implement encryption:

# Container/VM encryption options:
# - EBS encryption (AWS)
# - Azure Disk Encryption
# - Linux LUKS encryption
# - Filesystem-level encryption (ext4, XFS)

Implementation: - Enable full-disk encryption on deployment infrastructure - Use encrypted volumes for data directory - Encrypt backups separately - Maintain separate encryption keys for backups

2. In-Transit Encryption¶

Protect data in transit:

// HTTPS configuration (when using REST API)
let https_config = HttpsConfig {
    tls_version: "1.3",
    cipher_suites: vec![
        "TLS_AES_256_GCM_SHA384",
        "TLS_CHACHA20_POLY1305_SHA256",
    ],
    certificate: "/path/to/cert.pem",
    private_key: "/path/to/key.pem",
};

Best Practices: - Use TLS 1.3 minimum - Use strong cipher suites - Implement certificate pinning in SDKs - Rotate certificates before expiration

3. Backup Encryption¶

# Encrypt backups with GPG
tar czf database_backup.tar.gz ./data/
gpg --cipher-algo AES256 --symmetric database_backup.tar.gz

# Securely store encryption key separately

Access Control¶

1. File System Permissions¶

# Restrict data directory permissions
chmod 700 ./data/
chown database_user:database_group ./data/

# Restrict configuration files
chmod 600 ./config.yaml
chown database_user:database_group ./config.yaml

2. Process-Level Isolation¶

# Docker: Run as non-root user
FROM rust:latest
RUN useradd -m -u 1000 heliosdb
USER heliosdb:heliosdb

# Limit capabilities
RUN setcap -r /usr/local/bin/heliosdb-lite

3. Kubernetes RBAC¶

apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: heliosdb-reader
rules:
- apiGroups: [""]
  resources: ["configmaps"]
  verbs: ["get", "list"]
- apiGroups: [""]
  resources: ["secrets"]
  resourceNames: ["db-encryption-key"]
  verbs: ["get"]

Error Handling & Logging¶

1. Secure Error Messages¶

// GOOD: Generic error to clients
if database_error {
    return Err("Query execution failed");  // No details
}

// BAD: Detailed errors exposed
return Err(format!("SQL syntax error: {}", sql_error));  // Information leak

2. Audit Logging¶

// Log all administrative operations
audit_log::log_event(AuditEvent {
    timestamp: now(),
    user_id: user.id,
    action: "DROP TABLE users",
    table: "users",
    status: "success",
    source_ip: request.remote_addr(),
});

3. Security Event Logging¶

// Log security-relevant events
log::warn!("Failed authentication attempt from {}", client_ip);
log::error!("Unauthorized access attempt to table {}", table_name);
log::info!("User {} password changed", user_id);

Deployment Security¶

1. Environment Configuration¶

# Use environment variables for sensitive config
export HELIOSDB_DATA_DIR=/data
export HELIOSDB_ENCRYPTION_KEY=$(cat /run/secrets/db_key)
export HELIOSDB_LOG_LEVEL=info

# Never log sensitive values
LOG_LEVEL=info  # Not: LOG_SECRETS=true

2. Secrets Management¶

# Use secret management system
apiVersion: v1
kind: Secret
metadata:
  name: heliosdb-secrets
type: Opaque
data:
  encryption-key: base64_encoded_key
  backup-password: base64_encoded_password

3. Network Isolation¶

# Kubernetes: Restrict network access
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: heliosdb-network-policy
spec:
  podSelector:
    matchLabels:
      app: heliosdb
  policyTypes:
  - Ingress
  ingress:
  - from:
    - podSelector:
        matchLabels:
          app: application-tier
    ports:
    - protocol: TCP
      port: 5432

Monitoring & Alerting¶

1. Security Metrics¶

// Track security-relevant metrics
metrics::counter!("auth_failures", 1);
metrics::gauge!("active_connections", active_count);
metrics::histogram!("query_execution_time", elapsed);

2. Alert Thresholds¶

Set up alerts for: - Authentication failures > 10/minute - Rate limit exceeded > 5 times/hour - Unusual query patterns - Error rate > 1% - Disk space < 10%

3. Log Aggregation¶

# Example: ELK Stack configuration
filebeat.inputs:
- type: log
  enabled: true
  paths:
    - /var/log/heliosdb/security.log
    - /var/log/heliosdb/audit.log

output.elasticsearch:
  hosts: ["elasticsearch:9200"]

Security Checklist¶

Pre-Deployment¶

[ ] Enable HTTPS/TLS for all network endpoints
[ ] Configure authentication at application layer
[ ] Implement rate limiting (enabled by default)
[ ] Enable full-disk encryption
[ ] Restrict file system permissions (700 on data dir)
[ ] Configure audit logging
[ ] Set up security event alerting
[ ] Review and approve data access patterns
[ ] Document data sensitivity levels
[ ] Implement data retention policies

During Deployment¶

[ ] Use encrypted secrets management
[ ] Deploy behind API gateway with authentication
[ ] Isolate database service in VPC/network
[ ] Enable network policies (if using Kubernetes)
[ ] Verify TLS certificate validity
[ ] Test rate limiting functionality
[ ] Verify audit logging works
[ ] Set up monitoring and alerting
[ ] Document security configuration
[ ] Perform security testing

Post-Deployment¶

[ ] Monitor authentication logs for anomalies
[ ] Review rate limit metrics
[ ] Audit access patterns regularly
[ ] Rotate credentials on schedule
[ ] Test backup and recovery procedures
[ ] Keep logs for compliance period
[ ] Review security alerts
[ ] Update security patches promptly
[ ] Conduct periodic security audits
[ ] Train team on security procedures

Known Limitations¶

1. No Built-In Authentication¶

HeliosDB-Lite is embedded and does not provide authentication. Implement at application layer.

2. No Encryption at Rest (Database Level)¶

Use OS/container-level encryption. HeliosDB-Lite stores data in plaintext format locally.

3. No Role-Based Access Control¶

Implement RBAC at application layer. Database provides no user/role management.

4. Limited Query Audit Trail¶

Implement application-level audit logging. Database logs are minimal.

5. No Data Masking¶

Implement data masking at application layer for sensitive fields.

Compliance¶

✅ Right to be forgotten: Delete row data
✅ Data portability: Export data as SQL
✅ Data minimization: Only store necessary data
⚠️ Audit trail: Implement at application layer
⚠️ Encryption: Use OS-level encryption

HIPAA Compliance¶

✅ Encryption at rest: Use OS-level encryption
✅ Encryption in transit: Use HTTPS/TLS
⚠️ Access control: Implement at application layer
⚠️ Audit logging: Implement at application layer
⚠️ Business associate agreement: Not applicable (embedded)

SOC 2 Type II¶

✅ Availability: MVCC and crash recovery
✅ Processing integrity: Transaction support
⚠️ Confidentiality: Encryption at OS level
⚠️ Privacy: Access control at app level

Incident Response¶

Security Incident Procedure¶

Detect: Monitor security alerts and logs
Assess: Determine scope and impact
Contain: Limit access to affected data
Investigate: Review audit logs and metrics
Remediate: Apply fixes and patches
Recover: Restore from clean backup if needed
Document: Record incident details for analysis
Communicate: Notify affected parties per policy

Backup Recovery for Compromised Data¶

# 1. Stop application
systemctl stop application

# 2. Restore from clean backup
cp /backups/clean-database-20250101.backup ./data/

# 3. Verify integrity
heliosdb-lite verify-backup ./data/

# 4. Restart application
systemctl start application

Resources¶

Support¶

For security issues, please follow responsible disclosure:

Do NOT open public issues for security vulnerabilities
Email security@heliosdb.com with details
Allow 90 days for response and patching
Coordinate disclosure timeline

Last Updated: December 4, 2025 Version: 3.0.0 Status: Production Ready