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