This guide covers security best practices, threat modeling, and incident response for Zenith-Sentry.

• Security Overview
• Threat Model
• Security Architecture
• Best Practices
• Hardening Guidelines
• Incident Response
• Compliance

quadrantChart
    title Risk Likelihood vs Impact
    x-axis Low Likelihood --> High Likelihood
    y-axis Low Impact --> High Impact
    quadrant-1 Monitor
    quadrant-2 Reduce
    quadrant-3 Accept
    quadrant-4 Critical (Mitigate Immediately)
    "Plugin Code Exec": [0.9, 0.95]
    "API Auth Bypass": [0.7, 0.9]
    "Path Traversal": [0.6, 0.7]
    "DoS (Unbounded)": [0.5, 0.5]
    "Email Injection": [0.4, 0.6]
    "Config Perm Bypass": [0.3, 0.4]
    "Log Leak": [0.2, 0.3]
    "Health Check DoS": [0.1, 0.2]

Zenith-Sentry implements defense-in-depth security with multiple layers of protection:

1. Input Validation - All file paths, IPs, and directories are validated before processing
2. Command Injection Prevention - Parameterized commands (no shell=True), IP whitelisting, path sanitization
3. Secure Signal Handling - Reentrant-safe signal handlers with proper cleanup and masking
4. Encryption at Rest - AES-256 encryption with PBKDF2-HMAC-SHA256 key derivation (600,000 iterations)
5. Secure Logging - PII redaction, security event correlation, deterministic SHA-256 event IDs
6. Authentication - JWT tokens and API keys with constant-time comparison (hmac.compare_digest)
7. Authorization - Role-based access control (RBAC) with admin checks on defense endpoints
8. Memory Safety - Bounded storage limits on scans (1000), findings (10000), blocked IPs (1000), events (10000)
9. Symlink Defense - os.path.realpath resolution prevents path traversal via symlinks
10. Plugin Sandboxing - Dangerous import scanning, size limits (1MB), count limits (50), path validation

Threat: Attacker injects malicious commands through user input

Mitigation:

• Input validation for file paths and IPs
• Parameterized commands using subprocess
• IP whitelisting for network operations
• Shell command validation in scripts

# Secure command execution
from subprocess import run, PIPE
from zenith.utils.validation import validate_ip, validate_file_path

ip = validate_ip(user_input)
if ip:
    result = run(["iptables", "-A", "INPUT", "-s", ip, "-j", "DROP"], check=True)

Threat: Attacker gains elevated privileges through vulnerabilities

Mitigation:

• Run as non-root user when possible
• Use systemd security hardening
• Drop unnecessary capabilities
• Use namespaces and containers

# systemd service hardening
[Service]
NoNewPrivileges=true
PrivateTmp=true
ProtectSystem=strict
CapabilityBoundingSet=CAP_NET_ADMIN CAP_SYS_ADMIN

Threat: Attacker extracts sensitive data from logs or database

Mitigation:

• Encrypt sensitive data at rest
• PII redaction in logs
• Secure database connections with TLS
• Access control on log files

# Secure logging with PII redaction
from zenith.security.event_logger import SecureEventLogger

logger = SecureEventLogger(redact_pii=True)
logger.log_security_event(
    event_type="LOGIN",
    user="***@***.com",  # Will be redacted
    ip="192.168.1.1"
)

Threat: Attacker overwhelms system with requests or events

Mitigation:

• Rate limiting on API endpoints
• Circular buffer for eBPF events
• Memory limits on data structures
• Connection pooling for database

# Rate limiting configuration
api:
  rate_limit:
    enabled: true
    requests_per_minute: 60

Threat: Attacker bypasses authentication mechanisms

Mitigation:

• JWT secret keys required from environment (no defaults)
• API key verification with constant-time comparison (hmac.compare_digest)
• Token expiration
• All API routes require authentication (no anonymous endpoints)
• Auto-generated encryption keys rejected; explicit configuration required

# Secure API key verification
import hmac
expected_key = _get_valid_api_keys()
if not any(hmac.compare_digest(key, provided_key) for key in expected_key):
    raise HTTPException(status_code=403, detail="Invalid API key")

flowchart TB
    subgraph NL["Network Layer"]
        FW["Firewall"]
        TLS["TLS"]
        NS["Network Segmentation"]
    end

    subgraph AL["Application Layer"]
        AUTH["Authentication (JWT/API Keys)"]
        RBAC["Authorization (RBAC)"]
        IV["Input Validation"]
        RL["Rate Limiting"]
    end

    subgraph DL["Data Layer"]
        ENC["AES-256 Encryption"]
        ACL["Access Control (0o700/0o600)"]
        AUDIT["Audit Logging"]
        RET["Data Retention"]
    end

    subgraph SL["System Layer"]
        SSH["Secure Signal Handling"]
        PS["Privilege Separation"]
        CD["Capability Dropping"]
        SH["Systemd Hardening"]
    end

    NL --> AL
    AL --> DL
    DL --> SL

• JWT tokens with expiration (secret from env only)
• API key authentication with constant-time comparison
• Password hashing with PBKDF2-HMAC-SHA256 + random salt (600,000 iterations)
• Session management
• All API routes require authentication

• Role-based access control (RBAC)
• Permission checks on all endpoints
• Resource-level isolation
• Audit logging of access attempts

• AES-256 encryption for sensitive data with PBKDF2 key derivation
• TLS for database connections
• PII redaction in logs
• Secure file permissions (0o700 dirs, 0o600 files)
• Config files with insecure permissions are rejected

• Security event logging with deterministic SHA-256 event IDs
• Anomaly detection
• Alerting on suspicious activity with email header injection prevention
• Audit trail retention with bounded in-memory storage

sequenceDiagram
    autonumber
    actor U as User/API Client
    participant API as FastAPI
    participant AUTH as Auth Module
    participant JWT as JWT Handler

    U->>API: Request with Bearer token
    API->>AUTH: Extract token
    AUTH->>JWT: decode_jwt_token(token)
    JWT-->>AUTH: payload / ExpiredSignatureError
    alt Token valid
        AUTH-->>API: user payload
        API-->>U: 200 OK + data
    else Token expired
        AUTH-->>API: raise HTTPException(401)
        API-->>U: 401 Unauthorized
    else Token invalid
        AUTH-->>API: raise HTTPException(403)
        API-->>U: 403 Forbidden
    end

stateDiagram-v2
    [*] --> Detection
    Detection --> Analysis: Threat detected
    Analysis --> Containment: Confirmed threat
    Analysis --> Detection: False positive
    Containment --> Eradication: Threat isolated
    Eradication --> Recovery: Malware removed
    Recovery --> Monitoring: Service restored
    Monitoring --> Detection: Recurrence observed
    Monitoring --> [*]: Incident closed

requirementDiagram
    requirement encryption_req {
        id: SEC-001
        text: All sensitive data must be encrypted at rest using AES-256
        risk: high
        verifymethod: test
    }
    requirement auth_req {
        id: SEC-002
        text: All API endpoints must require authentication
        risk: high
        verifymethod: test
    }
    requirement path_req {
        id: SEC-003
        text: All file paths must be validated before access
        risk: high
        verifymethod: test
    }
    requirement plugin_req {
        id: SEC-004
        text: Plugins must be scanned for dangerous imports
        risk: medium
        verifymethod: inspection
    }
    requirement bound_req {
        id: SEC-005
        text: All collections must have bounded size limits
        risk: medium
        verifymethod: test
    }
    requirement log_req {
        id: SEC-006
        text: Logs must sanitize PII before writing
        risk: low
        verifymethod: test
    }

1. Use Official Sources

   # Install from official repository
   pip install zenith-sentry
   # or
   git clone https://github.com/official/Zenith-Sentry.git

2. Verify Signatures

   # Verify GPG signature
   gpg --verify zenith-sentry.tar.gz.asc

3. Run Security Verification

   # Run installation verification
   python zenith/scripts/verify_install.py

1. Use Strong Secrets

   # Generate secure encryption key
   python -c "from zenith.security.encryption import generate_key; print(generate_key())"
   
   # Set environment variable
   export ZENITH_ENCRYPTION_KEY="your-secure-key-here"

2. Secure Configuration File

   # Set secure permissions
   sudo chmod 600 /etc/zenith-sentry/config.yaml
   sudo chown root:root /etc/zenith-sentry/config.yaml

3. Use TLS in Production

   # Configure TLS
   database:
     url: "postgresql://zenith:password@localhost:5432/zenith?sslmode=require"

1. Run as Non-Root User

   # Create dedicated user
   sudo useradd -r -s /bin/false zenith-sentry
   
   # Run as non-root
   sudo -u zenith-sentry zenith-sentry

2. Use Firewall

   # Configure firewall
   sudo ufw allow 8000/tcp
   sudo ufw enable

3. Regular Updates

   # Update dependencies
   pip install --upgrade -r requirements.txt
   
   # Update system
   sudo apt-get update && sudo apt-get upgrade

4. Regular Backups

   # Automated backup
   python zenith/scripts/backup.py --output /backup/zenith-$(date +%Y%m%d).db

1. Security Testing

   # Run security scans
   bandit -r zenith/
   safety check

2. Code Review

   • Review all code for security issues
   • Use static analysis tools
   • Perform penetration testing

3. Dependency Scanning

   # Check for vulnerabilities
   pip-audit

1. Disable Unused Services

   # Disable unnecessary services
   sudo systemctl disable <service>

2. Secure SSH

   # Edit /etc/ssh/sshd_config
   PermitRootLogin no
   PasswordAuthentication no
   PubkeyAuthentication yes

3. Enable SELinux/AppArmor

   # Enable SELinux
   sudo setenforce 1
   
   # Or enable AppArmor
   sudo systemctl enable apparmor
   sudo systemctl start apparmor

1. Systemd Service Hardening

   [Service]
   NoNewPrivileges=true
   PrivateTmp=true
   ProtectSystem=strict
   ProtectHome=true
   ReadOnlyPaths=/etc/zenith-sentry
   ReadWritePaths=/var/log/zenith-sentry
   CapabilityBoundingSet=CAP_NET_ADMIN CAP_SYS_ADMIN

2. File Permissions

   # Secure file permissions
   sudo chmod 750 /etc/zenith-sentry/
   sudo chmod 750 /var/log/zenith-sentry/
   sudo chown -R zenith-sentry:zenith-sentry /etc/zenith-sentry/
   sudo chown -R zenith-sentry:zenith-sentry /var/log/zenith-sentry/

3. Network Hardening

   # Use reverse proxy with TLS
   # nginx configuration:
   server {
       listen 443 ssl http2;
       server_name zenith-sentry.example.com;
       
       ssl_certificate /path/to/cert.pem;
       ssl_certificate_key /path/to/key.pem;
       ssl_protocols TLSv1.2 TLSv1.3;
       ssl_ciphers HIGH:!aNULL:!MD5;
       
       location / {
           proxy_pass http://localhost:8000;
           proxy_set_header Host $host;
           proxy_set_header X-Real-IP $remote_addr;
           proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
           proxy_set_header X-Forwarded-Proto $scheme;
       }
   }

1. Enable TLS

   -- PostgreSQL TLS configuration
   -- In postgresql.conf:
   ssl = on
   ssl_cert_file = 'server.crt'
   ssl_key_file = 'server.key'
   ssl_protocols = 'TLSv1.2,TLSv1.3'

2. Strong Authentication

   -- Use strong passwords
   ALTER USER zenith WITH PASSWORD 'strong-password-here';
   
   -- Enable SCRAM-SHA-256
   ALTER SYSTEM SET password_encryption = 'scram-sha-256';

3. Row-Level Security

   -- Enable RLS
   ALTER TABLE findings ENABLE ROW LEVEL SECURITY;
   
   -- Create policy
   CREATE POLICY user_findings ON findings
       FOR SELECT
       USING (user_id = current_user_id());

1. Establish Incident Response Team

   • Security team lead
   • System administrator
   • Database administrator
   • Legal counsel (if needed)

2. Define Response Procedures

   • Detection and analysis
   • Containment
   • Eradication
   • Recovery
   • Post-incident activity

3. Set Up Monitoring

   • Real-time alerts
   • Log aggregation
   • Anomaly detection
   • Security dashboards

1. Monitor Security Events

   # View security events
   tail -f /var/log/zenith-sentry/security.log
   
   # Check for anomalies
   python -m zenith.monitoring.analyze_anomalies

2. Review Audit Logs

   # Review access logs
   grep "FAILED_LOGIN" /var/log/zenith-sentry/audit.log
   
   # Check for privilege escalation
   grep "PRIVILEGE_ESCALATION" /var/log/zenith-sentry/audit.log

3. Analyze Findings

   # Get critical findings
   curl http://localhost:8000/api/v1/findings?risk_level=critical
   
   # Check for suspicious activity
   curl http://localhost:8000/api/v1/findings?severity=high

1. Isolate Affected Systems

   # Stop the service
   sudo systemctl stop zenith-sentry
   
   # Disconnect from network if needed
   sudo ifdown eth0

2. Preserve Evidence

   # Create memory dump
   sudo dd if=/dev/mem of=/tmp/memory.dump bs=1M count=1024
   
   # Copy logs
   sudo cp -r /var/log/zenith-sentry /tmp/evidence/
   
   # Backup database
   python zenith/scripts/backup.py --output /tmp/evidence/zenith.db

3. Block Attackers

   # Block malicious IPs
   sudo iptables -A INPUT -s <attacker-ip> -j DROP
   
   # Block malicious processes
   sudo kill -9 <malicious-pid>

1. Remove Malicious Software

   # Remove malicious files
   sudo rm /tmp/malicious-file
   
   # Remove malicious processes
   sudo pkill -f malicious-process

2. Patch Vulnerabilities

   # Update system
   sudo apt-get update && sudo apt-get upgrade
   
   # Update Zenith-Sentry
   pip install --upgrade zenith-sentry

3. Change Credentials

   # Change all passwords
   # Change API keys
   # Change encryption keys

1. Restore from Backup

   # Restore database
   python zenith/scripts/restore.py --input /backup/clean-backup.db
   
   # Verify restore
   python -m zenith.db.base verify

2. Restart Services

   # Restart Zenith-Sentry
   sudo systemctl start zenith-sentry
   
   # Verify operation
   curl http://localhost:8000/health

3. Monitor for Recurrence

   # Monitor logs
   tail -f /var/log/zenith-sentry/security.log
   
   # Check for new findings
   curl http://localhost:8000/api/v1/findings

1. Document the Incident

   • Timeline of events
   • Actions taken
   • Lessons learned
   • Recommendations

2. Review Security Posture

   • Identify gaps
   • Update policies
   • Implement improvements

3. Communicate with Stakeholders

   • Notify affected users
   • Provide incident report
   • Share lessons learned

1. Data Subject Rights

   # Implement data export
   def export_user_data(user_id):
       findings = db.query(Finding).filter_by(user_id=user_id).all()
       return serialize(findings)
   
   # Implement data deletion
   def delete_user_data(user_id):
       db.query(Finding).filter_by(user_id=user_id).delete()
       db.commit()

2. Consent Management

   # Track consent
   def record_consent(user_id, consent_type):
       consent = Consent(
           user_id=user_id,
           type=consent_type,
           timestamp=datetime.utcnow(),
           granted=True
       )
       db.add(consent)
       db.commit()

3. Data Minimization

   • Only collect necessary data
   • Anonymize data when possible
   • Implement data retention policies

1. Security Controls

   • Implement access controls
   • Enable audit logging
   • Regular security reviews

2. Audit Trails

   # Log all user actions
   def log_user_action(user_id, action, resource):
       audit_log = AuditLog(
           user_id=user_id,
           action=action,
           resource=resource,
           timestamp=datetime.utcnow()
       )
       db.add(audit_log)
       db.commit()

3. Incident Response

   • Documented procedures
   • Regular testing
   • Continuous improvement

1. Protected Health Information (PHI)

   • Encrypt PHI at rest and in transit
   • Implement access controls
   • Audit access to PHI

2. Risk Assessment

   • Regular security assessments
   • Vulnerability scanning
   • Penetration testing

3. Business Associate Agreements

   • Ensure all vendors sign BAAs
   • Review vendor security practices

• Review security configuration
• Verify TLS certificates
• Test authentication mechanisms
• Review file permissions
• Run security scans (bandit, safety)
• Test backup/restore procedures
• Review audit logging configuration
• Verify firewall rules
• Test incident response procedures
• Document security policies

• Monitor security logs daily
• Review access logs weekly
• Run vulnerability scans monthly
• Update dependencies regularly
• Review user access quarterly
• Conduct security reviews annually
• Test incident response annually
• Update security policies annually

If you discover a security vulnerability in Zenith-Sentry:

1. Do not disclose publicly
2. Submit Bug Report on : bug Zenith Sentry
3. Email: zenith-sentry@orildo.sbs
4. Include details:
   • Vulnerability description
   • Steps to reproduce
   • Impact assessment
   • Suggested fix
5. Allow time to fix before disclosure

• OWASP Security Guidelines
• CIS Benchmarks
• NIST Cybersecurity Framework
• GDPR Compliance
• SOC2 Compliance

• Documentation: See docs/ directory
• Bug Reporting: Report bugs at bug Zenith Sentry
• Security: Report security vulnerabilities to Email

Note: Please do not create GitHub issues for bug reports. Use the bug reporting site above.