heretek-security

name	heretek-security
description	Security practices for Heretek Swarm. Use when implementing authentication, working with secrets, configuring NATS mTLS, or reviewing code for security issues. Covers zero-trust architecture, input validation, and audit trails.

Heretek Swarm Security

Security Architecture

Zero-Trust Model

• All inter-agent messages authenticated
• No implicit trust between services
• Least privilege access principles
• Defense in depth with multiple layers

Security Layers

1. Network - mTLS everywhere
2. Authentication - API keys, JWTs
3. Authorization - Role-based access
4. Input Validation - Sanitize all inputs
5. Audit Trails - Log all operations
6. Secrets Management - SOPS encryption

Authentication

API Keys

# backend/heretek_swarm/security/api_keys.py
from heretek_swarm.security import verify_api_key

@router.get("/agents")
async def get_agents(api_key: str = Depends(verify_api_key)):
    # API key verified
    return await list_agents()

JWT Tokens

# backend/heretek_swarm/security/jwt.py
from heretek_swarm.security import create_token, verify_token

# Create token
token = create_token(
    user_id="user123",
    roles=["admin"],
    expires_in=timedelta(hours=1)
)

# Verify token
payload = verify_token(token)

Agent Authentication

# All agent messages must be authenticated
class AgentMessage:
    content: str
    sender: str
    recipient: str
    signature: str  # HMAC signature
    timestamp: datetime
    
    def verify(self) -> bool:
        """Verify message signature."""
        return verify_hmac(
            self.content,
            self.signature,
            get_agent_key(self.sender)
        )

NATS mTLS

Certificate Generation

# Generate certificates
cd certs
./generate.sh

# Files created:
# - ca.pem (Certificate Authority)
# - server.pem (Server certificate)
# - server.key (Server private key)
# - client.pem (Client certificate)
# - client.key (Client private key)

Configuration

# docker-compose.yml
services:
  nats:
    command: >
      --tls
      --tls_cert=/certs/server.pem
      --tls_key=/certs/server.key
      --tls_ca=/certs/ca.pem
      --tls_verify=true

Client Connection

# backend/heretek_swarm/gateway/nats_client.py
import nats

async def connect_nats():
    nc = await nats.connect(
        "nats://nats:4222",
        tls={
            "cert": "/certs/client.pem",
            "key": "/certs/client.key",
            "ca": "/certs/ca.pem"
        }
    )
    return nc

Input Validation

Pydantic Models

from pydantic import BaseModel, Field, validator

class AgentMessage(BaseModel):
    content: str = Field(..., max_length=10000)
    recipient: str = Field(..., pattern=r'^[a-z_]+$')
    
    @validator('content')
    def sanitize_content(cls, v):
        # Remove potentially dangerous content
        return sanitize_input(v)

FastAPI Validation

from fastapi import HTTPException, Query

@router.get("/search")
async def search(
    query: str = Query(..., min_length=1, max_length=100),
    limit: int = Query(10, ge=1, le=100)
):
    # Query validated
    return await search_memories(query, limit)

Agent Message Validation

# backend/heretek_swarm/security/zero_trust.py
class ZeroTrustValidator:
    def validate_message(self, message: AgentMessage) -> bool:
        # Validate signature
        if not message.verify():
            raise InvalidSignature()
        
        # Validate timestamp (within 5 minutes)
        if abs((datetime.now() - message.timestamp).total_seconds()) > 300:
            raise MessageExpired()
        
        # Validate sender exists
        if not agent_exists(message.sender):
            raise UnknownAgent()
        
        return True

Secrets Management

SOPS Encryption

# Encrypt secrets
sops --encrypt secrets/decrypted.env > secrets/encrypted.env

# Decrypt secrets
sops --decrypt secrets/encrypted.env > secrets/decrypted.env

# Edit encrypted file
sops secrets/encrypted.env

Environment Variables

# Never commit secrets
# Use .env.example as template
cp .env.example .env

# Load secrets in Docker
docker compose --env-file secrets/decrypted.env up

Secret Rotation

# Rotate API keys
./scripts/rotate_keys.sh

# Rotate database passwords
./scripts/rotate_db_password.sh

# Rotate NATS certificates
./scripts/rotate_nats_certs.sh

Audit Trails

Structured Logging

import structlog

logger = structlog.get_logger(__name__)

# Log security events
logger.info(
    "agent_message_sent",
    sender="explorer",
    recipient="coordinator",
    message_type="status",
    timestamp=datetime.now().isoformat()
)

# Log authentication attempts
logger.warning(
    "authentication_failed",
    api_key_prefix="sk-...",
    ip_address="192.168.1.100",
    reason="invalid_key"
)

Audit Database

-- Audit table
CREATE TABLE audit_log (
    id SERIAL PRIMARY KEY,
    timestamp TIMESTAMPTZ NOT NULL,
    event_type VARCHAR(50) NOT NULL,
    actor VARCHAR(100) NOT NULL,
    action VARCHAR(100) NOT NULL,
    resource VARCHAR(200),
    details JSONB,
    ip_address INET,
    user_agent TEXT
);

-- Index for fast queries
CREATE INDEX idx_audit_timestamp ON audit_log(timestamp);
CREATE INDEX idx_audit_actor ON audit_log(actor);

Compliance Logging

# Log all data access
@router.get("/memories/{memory_id}")
async def get_memory(memory_id: str, user: User = Depends(get_current_user)):
    memory = await get_memory_by_id(memory_id)
    
    # Audit log
    await audit_log(
        action="memory_accessed",
        actor=user.id,
        resource=memory_id,
        details={"tags": memory.tags}
    )
    
    return memory

Authorization

Role-Based Access

from enum import Enum

class Role(Enum):
    ADMIN = "admin"
    AGENT = "agent"
    USER = "user"

class Permission(Enum):
    READ = "read"
    WRITE = "write"
    DELETE = "delete"
    ADMIN = "admin"

# Check permissions
def check_permission(user: User, permission: Permission) -> bool:
    return permission in ROLE_PERMISSIONS[user.role]

Agent Permissions

# Define agent capabilities
AGENT_CAPABILITIES = {
    "explorer": ["read", "write", "search"],
    "coder": ["read", "write", "execute"],
    "sentinel": ["read", "monitor", "alert"],
    "arbiter": ["read", "write", "decide"]
}

def check_agent_permission(agent: str, action: str) -> bool:
    return action in AGENT_CAPABILITIES.get(agent, [])

Rate Limiting

Implementation

from heretek_swarm.security.rate_limiter import RateLimiter

# Global rate limiter
rate_limiter = RateLimiter(
    max_requests=1000,
    window_seconds=60
)

# Per-agent rate limiter
agent_rate_limiter = RateLimiter(
    max_requests=100,
    window_seconds=60,
    key_func=lambda: current_agent.id
)

@router.get("/agents")
async def get_agents():
    if not rate_limiter.allow():
        raise HTTPException(status_code=429, detail="Rate limit exceeded")
    return await list_agents()

Rate Limit Headers

@router.get("/agents")
async def get_agents():
    return JSONResponse(
        content=agents,
        headers={
            "X-RateLimit-Limit": "100",
            "X-RateLimit-Remaining": "95",
            "X-RateLimit-Reset": "1640995200"
        }
    )

Security Testing

Static Analysis

# Bandit (Python security linter)
bandit -r backend/

# Safety (dependency vulnerabilities)
safety check

# Semgrep
semgrep --config=auto backend/

Dynamic Testing

# OWASP ZAP
docker run -t owasp/zap2docker-stable zap-full-scan.py http://localhost:8000

# Nmap
nmap -sV --script vuln localhost

Penetration Testing

# SQL injection testing
sqlmap -u "http://localhost:8000/api/search?query=test" --batch

# XSS testing
# Manual testing with browser dev tools

Code Review Security Checklist

Input Validation

• All inputs validated with Pydantic
• SQL queries use parameterized queries
• File paths validated to prevent traversal
• User input sanitized before display

Authentication

• API keys verified on all endpoints
• JWT tokens validated properly
• Agent messages authenticated
• No hardcoded credentials

Authorization

• Role-based access control implemented
• Least privilege principle applied
• Sensitive operations logged
• Admin endpoints protected

Secrets

• No secrets in code
• Secrets encrypted at rest
• Secrets rotated regularly
• Access to secrets logged

Error Handling

• Errors don't leak sensitive info
• Stack traces not exposed
• Validation errors generic
• Rate limiting implemented

Security Monitoring

Alert Rules

# prometheus/alerts.yml
groups:
  - name: security
    rules:
      - alert: HighFailedLogins
        expr: rate(failed_logins_total[5m]) > 10
        labels:
          severity: warning
        
      - alert: UnauthorizedAccess
        expr: increase(unauthorized_access_total[1h]) > 5
        labels:
          severity: critical

Dashboard

# Grafana dashboard for security metrics
- Failed login attempts
- Rate limit violations
- Unauthorized access attempts
- Audit log activity
- Certificate expiration

Incident Response

Security Incident Checklist

1. Detect - Identify the incident
2. Contain - Limit damage
3. Eradicate - Remove threat
4. Recover - Restore systems
5. Learn - Post-mortem analysis

Emergency Procedures

# Revoke all API keys
./scripts/revoke_all_keys.sh

# Rotate all secrets
./scripts/rotate_all_secrets.sh

# Enable maintenance mode
./scripts/maintenance_mode.sh on

# Review audit logs
docker compose exec postgres psql -U postgres -c \
  "SELECT * FROM audit_log WHERE timestamp > now() - interval '1 hour' ORDER BY timestamp DESC;"

Gotchas

1. Never commit secrets - Use SOPS encryption
2. Always validate inputs - SQL injection, XSS, path traversal
3. Authenticate all messages - Zero-trust model
4. Log security events - Audit trails required
5. Rotate secrets regularly - Automate rotation
6. Monitor for anomalies - Set up alerts
7. Test security regularly - Penetration testing
8. Keep dependencies updated - Vulnerability scanning
9. Use HTTPS everywhere - TLS termination
10. Follow least privilege - Minimal access rights

Best Practices

1. Implement defense in depth
2. Use parameterized queries
3. Validate all inputs
4. Implement proper error handling
5. Use secure defaults
6. Keep security logs
7. Rotate secrets regularly
8. Monitor for suspicious activity
9. Conduct regular security reviews
10. Document security procedures