import base64 import logging from Cryptodome.Cipher import AES, PKCS1_v1_5 from Cryptodome.Util.Padding import pad from Cryptodome.Random import get_random_bytes from Cryptodome.PublicKey import RSA from Cryptodome import Random from gmssl.sm4 import CryptSM4, SM4_ENCRYPT, SM4_DECRYPT from django.conf import settings from django.core.exceptions import ImproperlyConfigured def process_key(key): """ 返回32 bytes 的key """ if not isinstance(key, bytes): key = bytes(key, encoding='utf-8') if len(key) >= 32: return key[:32] return pad(key, 32) class BaseCrypto: def encrypt(self, text): return base64.urlsafe_b64encode( self._encrypt(bytes(text, encoding='utf8')) ).decode('utf8') def _encrypt(self, data: bytes) -> bytes: raise NotImplementedError def decrypt(self, text): return self._decrypt( base64.urlsafe_b64decode(bytes(text, encoding='utf8')) ).decode('utf8') def _decrypt(self, data: bytes) -> bytes: raise NotImplementedError class GMSM4EcbCrypto(BaseCrypto): def __init__(self, key): self.key = process_key(key) self.sm4_encryptor = CryptSM4() self.sm4_encryptor.set_key(self.key, SM4_ENCRYPT) self.sm4_decryptor = CryptSM4() self.sm4_decryptor.set_key(self.key, SM4_DECRYPT) def _encrypt(self, data: bytes) -> bytes: return self.sm4_encryptor.crypt_ecb(data) def _decrypt(self, data: bytes) -> bytes: return self.sm4_decryptor.crypt_ecb(data) class AESCrypto: """ AES 除了MODE_SIV模式key长度为：32, 48, or 64, 其余key长度为16, 24 or 32 详细见AES内部文档 CBC模式传入iv参数 本例使用常用的ECB模式 """ def __init__(self, key): if len(key) > 32: key = key[:32] self.key = self.to_16(key) @staticmethod def to_16(key): """ 转为16倍数的bytes数据 :param key: :return: """ key = bytes(key, encoding="utf8") while len(key) % 16 != 0: key += b'\0' return key # 返回bytes def aes(self): return AES.new(self.key, AES.MODE_ECB) # 初始化加密器 def encrypt(self, text): aes = self.aes() cipher = base64.encodebytes(aes.encrypt(self.to_16(text))) return str(cipher, encoding='utf8').replace('\n', '') # 加密 def decrypt(self, text): aes = self.aes() text_decoded = base64.decodebytes(bytes(text, encoding='utf8')) return str(aes.decrypt(text_decoded).rstrip(b'\0').decode("utf8")) class AESCryptoGCM: """ 使用AES GCM模式 """ def __init__(self, key): self.key = process_key(key) def encrypt(self, text): """ 加密text，并将 header, nonce, tag (3*16 bytes, base64后变为 3*24 bytes) 附在密文前。解密时要用到。 """ header = get_random_bytes(16) cipher = AES.new(self.key, AES.MODE_GCM) cipher.update(header) ciphertext, tag = cipher.encrypt_and_digest(bytes(text, encoding='utf-8')) result = [] for byte_data in (header, cipher.nonce, tag, ciphertext): result.append(base64.b64encode(byte_data).decode('utf-8')) return ''.join(result) def decrypt(self, text): """ 提取header, nonce, tag并解密text。 """ metadata = text[:72] header = base64.b64decode(metadata[:24]) nonce = base64.b64decode(metadata[24:48]) tag = base64.b64decode(metadata[48:]) ciphertext = base64.b64decode(text[72:]) cipher = AES.new(self.key, AES.MODE_GCM, nonce=nonce) cipher.update(header) plain_text_bytes = cipher.decrypt_and_verify(ciphertext, tag) return plain_text_bytes.decode('utf-8') def get_aes_crypto(key=None, mode='GCM'): if key is None: key = settings.SECRET_KEY if mode == 'ECB': a = AESCrypto(key) elif mode == 'GCM': a = AESCryptoGCM(key) return a def get_gm_sm4_ecb_crypto(key=None): key = key or settings.SECRET_KEY return GMSM4EcbCrypto(key) aes_ecb_crypto = get_aes_crypto(mode='ECB') aes_crypto = get_aes_crypto(mode='GCM') gm_sm4_ecb_crypto = get_gm_sm4_ecb_crypto() class Crypto: cryptoes = { 'aes_ecb': aes_ecb_crypto, 'aes_gcm': aes_crypto, 'aes': aes_crypto, 'gm_sm4_ecb': gm_sm4_ecb_crypto, 'gm': gm_sm4_ecb_crypto, } def __init__(self): cryptoes = self.__class__.cryptoes.copy() crypto = cryptoes.pop(settings.SECURITY_DATA_CRYPTO_ALGO, None) if crypto is None: raise ImproperlyConfigured( f'Crypto method not supported {settings.SECURITY_DATA_CRYPTO_ALGO}' ) self.cryptoes = [crypto, *cryptoes.values()] @property def encryptor(self): return self.cryptoes[0] def encrypt(self, text): return self.encryptor.encrypt(text) def decrypt(self, text): for decryptor in self.cryptoes: try: origin_text = decryptor.decrypt(text) if origin_text: # 有时不同算法解密不报错，但是返回空字符串 return origin_text except (TypeError, ValueError, UnicodeDecodeError, IndexError): continue def gen_key_pair(length=1024): """ 生成加密key 用于登录页面提交用户名/密码时，对密码进行加密（前端）/解密（后端） """ random_generator = Random.new().read rsa = RSA.generate(length, random_generator) rsa_private_key = rsa.exportKey().decode() rsa_public_key = rsa.publickey().exportKey().decode() return rsa_private_key, rsa_public_key def rsa_encrypt(message, rsa_public_key): """ 加密登录密码 """ key = RSA.importKey(rsa_public_key) cipher = PKCS1_v1_5.new(key) cipher_text = base64.b64encode(cipher.encrypt(message.encode())).decode() return cipher_text def rsa_decrypt(cipher_text, rsa_private_key=None): """ 解密登录密码 """ if rsa_private_key is None: # rsa_private_key 为 None，可以能是API请求认证，不需要解密 return cipher_text key = RSA.importKey(rsa_private_key) cipher = PKCS1_v1_5.new(key) cipher_decoded = base64.b64decode(cipher_text.encode()) # Todo: 弄明白为何要以下这么写，https://xbuba.com/questions/57035263 if len(cipher_decoded) == 127: hex_fixed = '00' + cipher_decoded.hex() cipher_decoded = base64.b16decode(hex_fixed.upper()) message = cipher.decrypt(cipher_decoded, b'error').decode() return message def rsa_decrypt_by_session_pkey(value): from jumpserver.utils import current_request if not current_request: return value private_key_name = settings.SESSION_RSA_PRIVATE_KEY_NAME private_key = current_request.session.get(private_key_name) if not private_key or not value: return value try: value = rsa_decrypt(value, private_key) except Exception as e: logging.error('Decrypt field error: {}'.format(e)) return value def decrypt_password(value): cipher = value.split(':') if len(cipher) != 2: return value key_cipher, password_cipher = cipher aes_key = rsa_decrypt_by_session_pkey(key_cipher) aes = get_aes_crypto(aes_key, 'ECB') try: password = aes.decrypt(password_cipher) except UnicodeDecodeError as e: logging.error("Decrypt password error: {}, {}".format(password_cipher, e)) return value return password crypto = Crypto()