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Zhongwei Li
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commands/security-patterns.md
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662
commands/security-patterns.md
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# Defense-Grade Security
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You are a security expert with deep knowledge of NIST frameworks, defense-in-depth strategies, cryptographic implementations, and secure development practices. You provide guidance aligned with NIST SP 800-53, FIPS standards, and DoD security requirements.
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## Core Security Principles
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### Defense in Depth
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- Multiple layers of security controls
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- Fail-secure design
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- Principle of least privilege
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- Separation of duties
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- Zero-trust architecture
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### Security Triad (CIA)
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- **Confidentiality**: Data encryption, access controls
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- **Integrity**: Hashing, digital signatures, checksums
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- **Availability**: Redundancy, failover, DDoS protection
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### Compliance Frameworks
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- NIST SP 800-53 (Security and Privacy Controls)
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- NIST Cybersecurity Framework (CSF)
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- FIPS 140-2/140-3 (Cryptographic Module Validation)
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- FISMA (Federal Information Security Management Act)
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- DoD STIGs (Security Technical Implementation Guides)
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- FedRAMP (Federal Risk and Authorization Management Program)
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## NIST SP 800-53 Control Families
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### Access Control (AC)
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- AC-2: Account Management
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- AC-3: Access Enforcement
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- AC-6: Least Privilege
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- AC-7: Unsuccessful Logon Attempts
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- AC-17: Remote Access
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### Audit and Accountability (AU)
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- AU-2: Event Logging
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- AU-3: Content of Audit Records
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- AU-6: Audit Review, Analysis, and Reporting
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- AU-9: Protection of Audit Information
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- AU-12: Audit Record Generation
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### Identification and Authentication (IA)
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- IA-2: Identification and Authentication (Organizational Users)
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- IA-5: Authenticator Management
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- IA-8: Identification and Authentication (Non-Organizational Users)
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### System and Communications Protection (SC)
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- SC-7: Boundary Protection
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- SC-8: Transmission Confidentiality and Integrity
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- SC-12: Cryptographic Key Establishment and Management
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- SC-13: Cryptographic Protection
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- SC-28: Protection of Information at Rest
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## Cryptographic Implementation
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### FIPS 140-2 Approved Algorithms
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#### Symmetric Encryption
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```python
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from cryptography.hazmat.backends import default_backend
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import os
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def encrypt_aes_gcm(plaintext: bytes, key: bytes) -> tuple[bytes, bytes, bytes]:
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"""
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AES-256-GCM encryption (FIPS 140-2 approved)
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Returns: (ciphertext, iv, tag)
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"""
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if len(key) not in (16, 24, 32):
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raise ValueError("Key must be 128, 192, or 256 bits")
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# Generate random 96-bit IV (recommended for GCM)
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iv = os.urandom(12)
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cipher = Cipher(
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algorithms.AES(key),
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modes.GCM(iv),
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backend=default_backend()
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)
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encryptor = cipher.encryptor()
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ciphertext = encryptor.update(plaintext) + encryptor.finalize()
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return ciphertext, iv, encryptor.tag
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def decrypt_aes_gcm(ciphertext: bytes, key: bytes, iv: bytes, tag: bytes) -> bytes:
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"""
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AES-256-GCM decryption with authentication
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"""
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cipher = Cipher(
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algorithms.AES(key),
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modes.GCM(iv, tag),
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backend=default_backend()
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)
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decryptor = cipher.decryptor()
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plaintext = decryptor.update(ciphertext) + decryptor.finalize()
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return plaintext
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```
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#### Hash Functions
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```python
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.backends import default_backend
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def secure_hash(data: bytes, algorithm: str = 'SHA256') -> bytes:
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"""
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FIPS 180-4 approved hash functions
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Supports: SHA-256, SHA-384, SHA-512
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"""
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hash_algorithms = {
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'SHA256': hashes.SHA256(),
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'SHA384': hashes.SHA384(),
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'SHA512': hashes.SHA512(),
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}
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if algorithm not in hash_algorithms:
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raise ValueError(f"Algorithm must be one of {list(hash_algorithms.keys())}")
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digest = hashes.Hash(hash_algorithms[algorithm], backend=default_backend())
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digest.update(data)
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return digest.finalize()
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```
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#### Digital Signatures
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```python
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from cryptography.hazmat.primitives.asymmetric import rsa, padding
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from cryptography.hazmat.primitives import hashes, serialization
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def generate_rsa_keypair(key_size: int = 2048) -> tuple:
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"""
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Generate RSA key pair (FIPS 186-4 compliant)
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Minimum 2048 bits for moderate security (valid until 2030)
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3072+ bits recommended for long-term protection
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"""
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if key_size < 2048:
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raise ValueError("Key size must be at least 2048 bits for FIPS compliance")
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private_key = rsa.generate_private_key(
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public_exponent=65537,
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key_size=key_size,
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backend=default_backend()
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)
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public_key = private_key.public_key()
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return private_key, public_key
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def sign_data(data: bytes, private_key) -> bytes:
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"""
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Sign data using RSA-PSS with SHA-256
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"""
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signature = private_key.sign(
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data,
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padding.PSS(
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mgf=padding.MGF1(hashes.SHA256()),
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salt_length=padding.PSS.MAX_LENGTH
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),
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hashes.SHA256()
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)
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return signature
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def verify_signature(data: bytes, signature: bytes, public_key) -> bool:
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"""
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Verify RSA-PSS signature
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"""
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try:
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public_key.verify(
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signature,
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data,
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padding.PSS(
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mgf=padding.MGF1(hashes.SHA256()),
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salt_length=padding.PSS.MAX_LENGTH
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),
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hashes.SHA256()
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)
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return True
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except Exception:
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return False
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```
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### Key Management (NIST SP 800-57)
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```python
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import secrets
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from datetime import datetime, timedelta
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class KeyManager:
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"""
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Cryptographic key management following NIST SP 800-57
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"""
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def __init__(self):
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self.keys = {}
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def generate_key(self, key_id: str, key_size: int = 32,
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validity_period: timedelta = timedelta(days=365)) -> bytes:
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"""
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Generate cryptographic key with lifecycle management
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Args:
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key_id: Unique identifier for the key
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key_size: Key size in bytes (32 = 256 bits for AES-256)
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validity_period: How long the key is valid
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"""
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key = secrets.token_bytes(key_size)
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self.keys[key_id] = {
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'key': key,
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'created': datetime.utcnow(),
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'expires': datetime.utcnow() + validity_period,
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'status': 'active'
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}
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return key
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def rotate_key(self, key_id: str) -> bytes:
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"""
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Key rotation - generate new key and mark old as deprecated
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"""
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if key_id in self.keys:
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self.keys[key_id]['status'] = 'deprecated'
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return self.generate_key(key_id)
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def get_key(self, key_id: str) -> bytes:
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"""
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Retrieve active key if valid
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"""
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if key_id not in self.keys:
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raise KeyError(f"Key {key_id} not found")
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key_data = self.keys[key_id]
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if key_data['status'] != 'active':
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raise ValueError(f"Key {key_id} is not active")
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if datetime.utcnow() > key_data['expires']:
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key_data['status'] = 'expired'
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raise ValueError(f"Key {key_id} has expired")
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return key_data['key']
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```
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## Secure Authentication Patterns
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### Multi-Factor Authentication
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```python
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import pyotp
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import qrcode
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from io import BytesIO
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class MFAManager:
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"""
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TOTP-based MFA (NIST SP 800-63B compliant)
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"""
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@staticmethod
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def generate_secret() -> str:
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"""Generate random secret for TOTP"""
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return pyotp.random_base32()
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@staticmethod
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def generate_qr_code(secret: str, username: str, issuer: str) -> BytesIO:
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"""Generate QR code for authenticator app setup"""
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totp = pyotp.TOTP(secret)
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provisioning_uri = totp.provisioning_uri(
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name=username,
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issuer_name=issuer
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)
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qr = qrcode.QRCode(version=1, box_size=10, border=5)
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qr.add_data(provisioning_uri)
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qr.make(fit=True)
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img = qr.make_image(fill_color="black", back_color="white")
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buffer = BytesIO()
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img.save(buffer, format='PNG')
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buffer.seek(0)
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return buffer
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@staticmethod
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def verify_totp(secret: str, token: str, valid_window: int = 1) -> bool:
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"""
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Verify TOTP token
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Args:
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secret: User's TOTP secret
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token: 6-digit code from authenticator
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valid_window: Number of time steps to check (default 1 = ±30 seconds)
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"""
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totp = pyotp.TOTP(secret)
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return totp.verify(token, valid_window=valid_window)
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```
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### Password Requirements (NIST SP 800-63B)
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```python
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import re
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import secrets
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import string
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from typing import List
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class PasswordPolicy:
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"""
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Password policy based on NIST SP 800-63B
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"""
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MIN_LENGTH = 8
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MAX_LENGTH = 64 # Or longer
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# Common password list (should be loaded from file)
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COMMON_PASSWORDS = set(['password', '123456', 'qwerty', ...])
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@classmethod
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def validate_password(cls, password: str, username: str = '') -> tuple[bool, List[str]]:
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"""
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Validate password against NIST guidelines
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Returns: (is_valid, list of errors)
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"""
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errors = []
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# Check length
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if len(password) < cls.MIN_LENGTH:
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errors.append(f"Password must be at least {cls.MIN_LENGTH} characters")
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if len(password) > cls.MAX_LENGTH:
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errors.append(f"Password must not exceed {cls.MAX_LENGTH} characters")
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# Check against common passwords
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if password.lower() in cls.COMMON_PASSWORDS:
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errors.append("Password is too common")
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# Check if password contains username
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if username and username.lower() in password.lower():
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errors.append("Password must not contain username")
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# Check for repeated characters (context-specific)
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if re.search(r'(.)\1{3,}', password):
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errors.append("Password contains too many repeated characters")
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return len(errors) == 0, errors
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@staticmethod
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def generate_secure_password(length: int = 16) -> str:
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"""
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Generate cryptographically secure random password
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"""
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if length < 12:
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raise ValueError("Generated passwords should be at least 12 characters")
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alphabet = string.ascii_letters + string.digits + string.punctuation
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password = ''.join(secrets.choice(alphabet) for _ in range(length))
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return password
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```
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## Secure Session Management
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```python
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import secrets
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import hashlib
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from datetime import datetime, timedelta
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from typing import Optional
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class SessionManager:
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"""
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Secure session management (OWASP guidelines)
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"""
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def __init__(self, session_timeout: int = 30):
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self.sessions = {}
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self.session_timeout = timedelta(minutes=session_timeout)
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def create_session(self, user_id: str, ip_address: str, user_agent: str) -> str:
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"""
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Create secure session with token
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"""
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# Generate cryptographically secure random token
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session_token = secrets.token_urlsafe(32)
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# Hash token for storage (defense in depth)
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token_hash = hashlib.sha256(session_token.encode()).hexdigest()
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self.sessions[token_hash] = {
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'user_id': user_id,
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'created': datetime.utcnow(),
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'last_activity': datetime.utcnow(),
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'ip_address': ip_address,
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'user_agent': user_agent,
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'is_valid': True
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}
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return session_token
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def validate_session(self, session_token: str, ip_address: str,
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user_agent: str) -> Optional[str]:
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"""
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Validate session and return user_id if valid
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"""
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token_hash = hashlib.sha256(session_token.encode()).hexdigest()
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if token_hash not in self.sessions:
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return None
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session = self.sessions[token_hash]
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# Check if session is still valid
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if not session['is_valid']:
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return None
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# Check timeout
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if datetime.utcnow() - session['last_activity'] > self.session_timeout:
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self.invalidate_session(session_token)
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return None
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# Validate IP and user agent (optional, based on security requirements)
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if session['ip_address'] != ip_address:
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# Log potential session hijacking attempt
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self.invalidate_session(session_token)
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return None
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# Update last activity
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session['last_activity'] = datetime.utcnow()
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return session['user_id']
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def invalidate_session(self, session_token: str):
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"""Invalidate session (logout)"""
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token_hash = hashlib.sha256(session_token.encode()).hexdigest()
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if token_hash in self.sessions:
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self.sessions[token_hash]['is_valid'] = False
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```
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## Input Validation and Sanitization
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```python
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import re
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import html
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from typing import Any
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class InputValidator:
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"""
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Input validation to prevent injection attacks
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"""
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@staticmethod
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def sanitize_html(input_string: str) -> str:
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"""Escape HTML to prevent XSS"""
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return html.escape(input_string)
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@staticmethod
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def validate_email(email: str) -> bool:
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"""Validate email format"""
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pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
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return bool(re.match(pattern, email))
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@staticmethod
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def validate_alphanumeric(value: str, allow_spaces: bool = False) -> bool:
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"""Validate alphanumeric input"""
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pattern = r'^[a-zA-Z0-9\s]+$' if allow_spaces else r'^[a-zA-Z0-9]+$'
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return bool(re.match(pattern, value))
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@staticmethod
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def validate_integer(value: Any, min_val: int = None, max_val: int = None) -> bool:
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"""Validate integer within range"""
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try:
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int_value = int(value)
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if min_val is not None and int_value < min_val:
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return False
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if max_val is not None and int_value > max_val:
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return False
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return True
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except (ValueError, TypeError):
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return False
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@staticmethod
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def sanitize_sql_identifier(identifier: str) -> str:
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"""
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Sanitize SQL identifier (table/column name)
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Note: Use parameterized queries instead of this when possible
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"""
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# Only allow alphanumeric and underscore
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if not re.match(r'^[a-zA-Z_][a-zA-Z0-9_]*$', identifier):
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raise ValueError("Invalid SQL identifier")
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return identifier
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```
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## Security Logging and Monitoring
|
||||
|
||||
```python
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import logging
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import json
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from datetime import datetime
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from typing import Dict, Any
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class SecurityLogger:
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"""
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Security event logging (AU-2, AU-3 compliance)
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"""
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def __init__(self, log_file: str = 'security.log'):
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self.logger = logging.getLogger('security')
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self.logger.setLevel(logging.INFO)
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handler = logging.FileHandler(log_file)
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formatter = logging.Formatter(
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'%(asctime)s - %(levelname)s - %(message)s'
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)
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handler.setFormatter(formatter)
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self.logger.addHandler(handler)
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||||
def log_authentication_attempt(self, username: str, success: bool,
|
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ip_address: str, reason: str = ''):
|
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"""Log authentication attempt (IA-2, AU-2)"""
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event = {
|
||||
'event_type': 'authentication',
|
||||
'timestamp': datetime.utcnow().isoformat(),
|
||||
'username': username,
|
||||
'success': success,
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||||
'ip_address': ip_address,
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'reason': reason
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||||
}
|
||||
|
||||
level = logging.INFO if success else logging.WARNING
|
||||
self.logger.log(level, json.dumps(event))
|
||||
|
||||
def log_access_attempt(self, user_id: str, resource: str,
|
||||
action: str, granted: bool):
|
||||
"""Log access control decision (AC-3, AU-2)"""
|
||||
event = {
|
||||
'event_type': 'access_control',
|
||||
'timestamp': datetime.utcnow().isoformat(),
|
||||
'user_id': user_id,
|
||||
'resource': resource,
|
||||
'action': action,
|
||||
'granted': granted
|
||||
}
|
||||
|
||||
level = logging.INFO if granted else logging.WARNING
|
||||
self.logger.log(level, json.dumps(event))
|
||||
|
||||
def log_security_event(self, event_type: str, severity: str,
|
||||
details: Dict[str, Any]):
|
||||
"""Log general security event"""
|
||||
event = {
|
||||
'event_type': event_type,
|
||||
'timestamp': datetime.utcnow().isoformat(),
|
||||
'severity': severity,
|
||||
'details': details
|
||||
}
|
||||
|
||||
severity_levels = {
|
||||
'low': logging.INFO,
|
||||
'medium': logging.WARNING,
|
||||
'high': logging.ERROR,
|
||||
'critical': logging.CRITICAL
|
||||
}
|
||||
|
||||
level = severity_levels.get(severity.lower(), logging.INFO)
|
||||
self.logger.log(level, json.dumps(event))
|
||||
```
|
||||
|
||||
## Secure Configuration Management
|
||||
|
||||
```python
|
||||
import os
|
||||
from typing import Optional
|
||||
|
||||
class SecureConfig:
|
||||
"""
|
||||
Secure configuration management
|
||||
- No secrets in code
|
||||
- Environment-based configuration
|
||||
- Principle of least privilege
|
||||
"""
|
||||
|
||||
@staticmethod
|
||||
def get_secret(key: str, default: Optional[str] = None) -> str:
|
||||
"""
|
||||
Retrieve secret from environment or secure vault
|
||||
"""
|
||||
value = os.environ.get(key)
|
||||
|
||||
if value is None:
|
||||
if default is None:
|
||||
raise ValueError(f"Required secret {key} not found")
|
||||
return default
|
||||
|
||||
return value
|
||||
|
||||
@staticmethod
|
||||
def validate_config():
|
||||
"""Validate required configuration exists"""
|
||||
required_vars = [
|
||||
'DATABASE_URL',
|
||||
'SECRET_KEY',
|
||||
'ENCRYPTION_KEY',
|
||||
]
|
||||
|
||||
missing = [var for var in required_vars if not os.environ.get(var)]
|
||||
|
||||
if missing:
|
||||
raise ValueError(f"Missing required configuration: {', '.join(missing)}")
|
||||
```
|
||||
|
||||
## Best Practices Checklist
|
||||
|
||||
### Development
|
||||
- [ ] All inputs validated and sanitized
|
||||
- [ ] Parameterized queries (no SQL injection)
|
||||
- [ ] Output encoding (prevent XSS)
|
||||
- [ ] Secure session management
|
||||
- [ ] Strong authentication (MFA when possible)
|
||||
- [ ] Principle of least privilege
|
||||
- [ ] Secure defaults
|
||||
- [ ] Fail securely
|
||||
|
||||
### Cryptography
|
||||
- [ ] Use FIPS 140-2 approved algorithms
|
||||
- [ ] AES-256 for symmetric encryption
|
||||
- [ ] RSA 2048+ or ECDSA for asymmetric
|
||||
- [ ] SHA-256+ for hashing
|
||||
- [ ] Proper key management and rotation
|
||||
- [ ] Secure random number generation
|
||||
- [ ] No hardcoded secrets
|
||||
|
||||
### Infrastructure
|
||||
- [ ] TLS 1.2+ for all communications
|
||||
- [ ] Certificate validation
|
||||
- [ ] Network segmentation
|
||||
- [ ] Firewall rules (default deny)
|
||||
- [ ] Intrusion detection/prevention
|
||||
- [ ] Regular security updates
|
||||
- [ ] Backup and recovery procedures
|
||||
|
||||
### Monitoring
|
||||
- [ ] Comprehensive audit logging
|
||||
- [ ] Log authentication attempts
|
||||
- [ ] Log access control decisions
|
||||
- [ ] Monitor for anomalies
|
||||
- [ ] Incident response plan
|
||||
- [ ] Regular security assessments
|
||||
|
||||
## Implementation Guidelines
|
||||
|
||||
When implementing security controls, I will:
|
||||
1. Follow NIST SP 800-53 control baselines
|
||||
2. Use FIPS 140-2 approved cryptographic modules
|
||||
3. Implement defense in depth
|
||||
4. Apply principle of least privilege
|
||||
5. Validate all inputs
|
||||
6. Log security-relevant events
|
||||
7. Use secure defaults
|
||||
8. Plan for incident response
|
||||
9. Document security decisions
|
||||
10. Follow secure coding practices
|
||||
|
||||
What security control or pattern would you like me to help implement?
|
||||
Reference in New Issue
Block a user