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codegate_ca.py
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import datetime
import os
import ssl
from typing import Dict, Optional, Tuple
import structlog
from cryptography import x509
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.x509.oid import ExtendedKeyUsageOID, NameOID
from codegate.config import Config
logger = structlog.get_logger("codegate")
class CertificateAuthority:
"""
Singleton class for Certificate Authority management.
Access the instance using CertificateAuthority.get_instance()
"""
_instance: Optional["CertificateAuthority"] = None
@classmethod
def get_instance(cls) -> "CertificateAuthority":
"""Get or create the singleton instance of CertificateAuthority"""
if cls._instance is None:
logger.debug("Creating new CertificateAuthority instance")
cls._instance = cls()
return cls._instance
def __init__(self):
"""
Initialize the Certificate Authority.
Note: Use get_instance() instead of creating a new instance directly.
"""
if CertificateAuthority._instance is not None:
raise RuntimeError("Use CertificateAuthority.get_instance() instead")
logger.debug("Initializing Certificate Authority class: CertificateAuthority")
self._ca_cert = None
self._ca_key = None
self._cert_cache: Dict[str, Tuple[str, str]] = {}
self._load_or_generate_ca()
CertificateAuthority._instance = self
def _load_or_generate_ca(self):
"""Load existing CA certificate and key or generate new ones"""
logger.debug("Loading or generating CA certificate and key: fn: _load_or_generate_ca")
ca_cert = os.path.join(Config.get_config().certs_dir, Config.get_config().ca_cert)
ca_key = os.path.join(Config.get_config().certs_dir, Config.get_config().ca_key)
if os.path.exists(ca_cert) and os.path.exists(ca_key):
# Load existing CA certificate and key
with open(ca_cert, "rb") as f:
logger.debug(f"Loading CA certificate from {ca_cert}")
self._ca_cert = x509.load_pem_x509_certificate(f.read())
with open(ca_key, "rb") as f:
logger.debug(f"Loading CA key from {ca_key}")
self._ca_key = serialization.load_pem_private_key(f.read(), password=None)
else:
# Generate new CA certificate and key
logger.debug("Generating new CA certificate and key")
self._ca_key = rsa.generate_private_key(
public_exponent=65537,
key_size=4096,
)
name = x509.Name(
[
x509.NameAttribute(NameOID.COMMON_NAME, "CodeGate CA"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "CodeGate"),
x509.NameAttribute(NameOID.ORGANIZATIONAL_UNIT_NAME, "CodeGate"),
x509.NameAttribute(NameOID.COUNTRY_NAME, "UK"),
]
)
builder = x509.CertificateBuilder()
builder = builder.subject_name(name)
builder = builder.issuer_name(name)
builder = builder.public_key(self._ca_key.public_key())
builder = builder.serial_number(x509.random_serial_number())
builder = builder.not_valid_before(datetime.datetime.utcnow())
builder = builder.not_valid_after(
datetime.datetime.utcnow() + datetime.timedelta(days=3650) # 10 years
)
builder = builder.add_extension(
x509.BasicConstraints(ca=True, path_length=None),
critical=True,
)
builder = builder.add_extension(
x509.KeyUsage(
digital_signature=True,
content_commitment=False,
key_encipherment=True,
data_encipherment=False,
key_agreement=False,
key_cert_sign=True, # This is a CA
crl_sign=True,
encipher_only=False,
decipher_only=False,
),
critical=True,
)
self._ca_cert = builder.sign(
private_key=self._ca_key,
algorithm=hashes.SHA256(),
)
# Save CA certificate and key
if not os.path.exists(Config.get_config().certs_dir):
logger.debug(f"Creating directory: {Config.get_config().certs_dir}")
os.makedirs(Config.get_config().certs_dir)
with open(ca_cert, "wb") as f:
logger.debug(f"Saving CA certificate to {ca_cert}")
f.write(self._ca_cert.public_bytes(serialization.Encoding.PEM))
with open(ca_key, "wb") as f:
logger.debug(f"Saving CA key to {ca_key}")
f.write(
self._ca_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption(),
)
)
def get_domain_certificate(self, domain: str) -> Tuple[str, str]:
"""Get or generate a certificate for a specific domain"""
logger.debug(f"Getting domain certificate for domain: {domain} fn: get_domain_certificate")
if domain in self._cert_cache:
return self._cert_cache[domain]
# Generate new certificate for domain
logger.debug(f"Generating private key for domain: {domain}")
key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048, # 2048 bits is sufficient for domain certs
)
name = x509.Name(
[
x509.NameAttribute(NameOID.COMMON_NAME, domain),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "Proxy Pilot Generated"),
]
)
builder = x509.CertificateBuilder()
builder = builder.subject_name(name)
builder = builder.issuer_name(self._ca_cert.subject)
builder = builder.public_key(key.public_key())
builder = builder.serial_number(x509.random_serial_number())
builder = builder.not_valid_before(datetime.datetime.utcnow())
builder = builder.not_valid_after(datetime.datetime.utcnow() + datetime.timedelta(days=365))
# Add domain to SAN
builder = builder.add_extension(
x509.SubjectAlternativeName([x509.DNSName(domain)]),
critical=False,
)
# Add extended key usage
builder = builder.add_extension(
x509.ExtendedKeyUsage(
[
ExtendedKeyUsageOID.SERVER_AUTH,
ExtendedKeyUsageOID.CLIENT_AUTH,
]
),
critical=False,
)
# Basic constraints (not a CA)
builder = builder.add_extension(
x509.BasicConstraints(ca=False, path_length=None),
critical=True,
)
logger.debug(f"Signing certificate for domain: {domain}")
certificate = builder.sign(
private_key=self._ca_key,
algorithm=hashes.SHA256(),
)
# Save domain certificate and key
logger.debug(f"Saving certificate and key for domain: {domain}")
domain_cert_path = os.path.join(Config.get_config().certs_dir, f"{domain}.crt")
domain_key_path = os.path.join(Config.get_config().certs_dir, f"{domain}.key")
with open(domain_cert_path, "wb") as f:
logger.debug(f"Saving certificate to {domain_cert_path}")
f.write(certificate.public_bytes(serialization.Encoding.PEM))
with open(domain_key_path, "wb") as f:
logger.debug(f"Saving key to {domain_key_path}")
f.write(
key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption(),
)
)
self._cert_cache[domain] = (domain_cert_path, domain_key_path)
return domain_cert_path, domain_key_path
def generate_certificates(self) -> Tuple[str, str]:
"""Generate self-signed certificates with proper extensions for HTTPS proxy"""
logger.debug("Generating certificates fn: generate_certificates")
if not os.path.exists(Config.get_config().certs_dir):
logger.debug(f"Creating directory: {Config.get_config().certs_dir}")
os.makedirs(Config.get_config().certs_dir)
# Generate private key
logger.debug("Generating private key for CA")
ca_private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=4096,
)
# Generate public key
logger.debug("Generating public key for CA")
ca_public_key = ca_private_key.public_key()
# Add name attributes
name = x509.Name(
[
x509.NameAttribute(NameOID.COMMON_NAME, "CodeGate CA"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "CodeGate"),
x509.NameAttribute(NameOID.ORGANIZATIONAL_UNIT_NAME, "CodeGate"),
x509.NameAttribute(NameOID.COUNTRY_NAME, "UK"),
]
)
# Create certificate builder
builder = x509.CertificateBuilder()
# Basic certificate information
builder = builder.subject_name(name)
builder = builder.issuer_name(name)
builder = builder.public_key(ca_public_key)
builder = builder.serial_number(x509.random_serial_number())
builder = builder.not_valid_before(datetime.datetime.utcnow())
builder = builder.not_valid_after(datetime.datetime.utcnow() + datetime.timedelta(days=365))
builder = builder.add_extension(
x509.BasicConstraints(ca=True, path_length=None),
critical=True,
)
# Add key usage extensions
builder = builder.add_extension(
x509.KeyUsage(
digital_signature=True,
content_commitment=False,
key_encipherment=True,
data_encipherment=False,
key_agreement=False,
key_cert_sign=True, # This is a CA
crl_sign=True,
encipher_only=False,
decipher_only=False,
),
critical=True,
)
logger.debug("Signing CA certificate")
ca_cert = builder.sign(
private_key=ca_private_key,
algorithm=hashes.SHA256(),
)
# Save CA certificate and key
with open(
os.path.join(Config.get_config().certs_dir, Config.get_config().ca_cert), "wb"
) as f:
logger.debug(f"Saving CA certificate to {Config.get_config().ca_cert}")
f.write(ca_cert.public_bytes(serialization.Encoding.PEM))
with open(
os.path.join(Config.get_config().certs_dir, Config.get_config().ca_key), "wb"
) as f:
logger.debug(f"Saving CA key to {Config.get_config().ca_key}")
f.write(
ca_private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption(),
)
)
# CA generated, now generate server certificate
## Generate new certificate for domain
logger.debug("Generating private key for server")
server_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048, # 2048 bits is sufficient for domain certs
)
name = x509.Name(
[
x509.NameAttribute(NameOID.COMMON_NAME, "CodeGate Server"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "CodeGate"),
]
)
# Add extended key usage extension
builder = x509.CertificateBuilder()
builder = builder.subject_name(name)
builder = builder.issuer_name(ca_cert.subject)
builder = builder.public_key(server_key.public_key())
builder = builder.serial_number(x509.random_serial_number())
builder = builder.not_valid_before(datetime.datetime.utcnow())
builder = builder.not_valid_after(datetime.datetime.utcnow() + datetime.timedelta(days=365))
# Add domain to SAN
builder = builder.add_extension(
x509.SubjectAlternativeName([x509.DNSName("localhost")]),
critical=False,
)
# Add extended key usage
builder = builder.add_extension(
x509.ExtendedKeyUsage(
[
ExtendedKeyUsageOID.SERVER_AUTH,
ExtendedKeyUsageOID.CLIENT_AUTH,
]
),
critical=False,
)
# Basic constraints (not a CA)
builder = builder.add_extension(
x509.BasicConstraints(ca=False, path_length=None),
critical=True,
)
logger.debug("Signing server certificate")
server_cert = builder.sign(
private_key=ca_private_key,
algorithm=hashes.SHA256(),
)
with open(
os.path.join(Config.get_config().certs_dir, Config.get_config().server_cert), "wb"
) as f:
logger.debug(f"Saving server certificate to {Config.get_config().server_cert}")
f.write(server_cert.public_bytes(serialization.Encoding.PEM))
with open(
os.path.join(Config.get_config().certs_dir, Config.get_config().server_key), "wb"
) as f:
logger.debug(f"Saving server key to {Config.get_config().server_key}")
f.write(
server_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption(),
)
)
# Print instructions for trusting the certificates
logger.debug("Certificates generated successfully")
return server_cert, server_key
def create_ssl_context(self) -> ssl.SSLContext:
"""Create SSL context with secure configuration"""
logger.debug("Creating SSL context fn: create_ssl_context")
ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
logger.debug(
f"Loading server certificate for ssl_context from: {Config.get_config().server_cert}"
)
ssl_context.load_cert_chain(
os.path.join(Config.get_config().certs_dir, Config.get_config().server_cert),
os.path.join(Config.get_config().certs_dir, Config.get_config().server_key),
)
ssl_context.minimum_version = ssl.TLSVersion.TLSv1_2
ssl_context.options |= (
ssl.OP_NO_SSLv2
| ssl.OP_NO_SSLv3
| ssl.OP_NO_COMPRESSION
| ssl.OP_CIPHER_SERVER_PREFERENCE
)
ssl_context.set_ciphers("ECDHE+AESGCM:ECDHE+CHACHA20:DHE+AESGCM:DHE+CHACHA20")
logger.debug("SSL context created successfully")
return ssl_context
def check_certificates_exist(self) -> bool:
"""Check if SSL certificates exist"""
logger.debug("Checking if certificates exist fn: check_certificates_exist")
return os.path.exists(
os.path.join(Config.get_config().certs_dir, Config.get_config().server_cert)
) and os.path.exists(
os.path.join(Config.get_config().certs_dir, Config.get_config().server_key)
)
def ensure_certificates_exist(self) -> bool:
"""Ensure SSL certificates exist, generate if they don't"""
logger.debug("Ensuring certificates exist. fn ensure_certificates_exist")
if not self.check_certificates_exist():
logger.info("Certificates not found. Generating new certificates.")
self.generate_certificates()
def get_ssl_context(self) -> ssl.SSLContext:
"""Get SSL context with certificates"""
logger.debug("Getting SSL context fn: get_ssl_context")
self.ensure_certificates_exist()
return self.create_ssl_context()
def get_cert_files(self) -> Tuple[str, str]:
"""Get certificate and key file paths"""
logger.debug("Getting certificate and key file paths fn: get_cert_files")
return Config.get_config().server_cert, Config.get_config().server_key