249 lines
7.2 KiB
Python
249 lines
7.2 KiB
Python
#!/usr/bin/env python3
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import argparse
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import base64
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import datetime
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import getpass
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from pathlib import Path
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import serialization
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from cryptography import x509
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from cryptography.x509.oid import NameOID
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from cryptography.x509.oid import ExtensionOID
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.asymmetric import padding
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from conf import TOKEN
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class SATCertificate(object):
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def __init__(self, cer=b'', key=b'', pem=b'', password=''):
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self._error = ''
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self._init_values()
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self._get_data_cer(cer)
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self._get_data_key(key, password)
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self._get_data_pem(pem)
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def _init_values(self):
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self._rfc = ''
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self._serial_number = ''
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self._serial_number2 = ''
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self._not_before = None
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self._not_after = None
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self._is_fiel = False
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self._are_couple = False
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self._is_valid_time = False
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self._cer_pem = ''
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self._cer_txt = ''
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self._key_enc = b''
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self._key_pem = b''
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self._p12 = b''
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self._cer_modulus = 0
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self._key_modulus = 0
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self._issuer = ''
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return
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def __str__(self):
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msg = '\tRFC: {}\n'.format(self.rfc)
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msg += '\tNo de Serie: {}\n'.format(self.serial_number)
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msg += '\tVálido desde: {}\n'.format(self.not_before)
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msg += '\tVálido hasta: {}\n'.format(self.not_after)
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msg += '\tEs vigente: {}\n'.format(self.is_valid_time)
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msg += '\tSon pareja: {}\n'.format(self.are_couple)
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msg += '\tEs FIEL: {}\n'.format(self.is_fiel)
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return msg
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def __bool__(self):
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return self.is_valid
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def _get_hash(self):
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digest = hashes.Hash(hashes.SHA512(), default_backend())
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digest.update(self._rfc.encode())
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digest.update(self._serial_number.encode())
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digest.update(TOKEN.encode())
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return digest.finalize()
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def _get_data_cer(self, cer):
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obj = x509.load_der_x509_certificate(cer, default_backend())
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self._rfc = obj.subject.get_attributes_for_oid(
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NameOID.X500_UNIQUE_IDENTIFIER)[0].value.split(' ')[0]
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self._serial_number2 = obj.serial_number
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self._serial_number = '{0:x}'.format(obj.serial_number)[1::2]
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self._not_before = obj.not_valid_before
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self._not_after = obj.not_valid_after
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self._issuer = ','.join([i.rfc4514_string() for i in obj.issuer])
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now = datetime.datetime.utcnow()
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self._is_valid_time = (now > self.not_before) and (now < self.not_after)
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if not self._is_valid_time:
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msg = 'El certificado no es vigente'
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self._error = msg
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self._is_fiel = obj.extensions.get_extension_for_oid(
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ExtensionOID.KEY_USAGE).value.key_agreement
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self._cer_pem = obj.public_bytes(serialization.Encoding.PEM).decode()
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self._cer_txt = ''.join(self._cer_pem.split('\n')[1:-2])
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self._cer_modulus = obj.public_key().public_numbers().n
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return
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def _get_data_key(self, key, password):
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self._key_enc = key
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if not key or not password:
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return
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try:
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obj = serialization.load_der_private_key(
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key, password.encode(), default_backend())
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except ValueError:
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msg = 'La contraseña es incorrecta'
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self._error = msg
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return
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p = self._get_hash()
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self._key_enc = obj.private_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PrivateFormat.PKCS8,
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encryption_algorithm=serialization.BestAvailableEncryption(p)
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)
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self._key_modulus = obj.public_key().public_numbers().n
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self._are_couple = self._cer_modulus == self._key_modulus
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if not self._are_couple:
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msg = 'El CER y el KEY no son pareja'
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self._error = msg
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return
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def _get_key(self, password):
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if not password:
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password = self._get_hash()
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private_key = serialization.load_pem_private_key(
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self._key_enc, password=password, backend=default_backend())
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return private_key
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def _get_key_pem(self):
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obj = self._get_key('')
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key_pem = obj.private_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PrivateFormat.PKCS8,
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encryption_algorithm=serialization.NoEncryption()
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)
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return key_pem
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def _get_data_pem(self, pem):
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if not pem:
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return
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self._key_pem = serialization.load_pem_private_key(
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pem, None, backend=default_backend())
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return
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# Not work
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def _get_p12(self):
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obj = serialization.pkcs12.serialize_key_and_certificates('test',
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self.key_pem, self.cer_pem, None,
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encryption_algorithm=serialization.NoEncryption()
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)
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return obj
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def sign(self, data, password=''):
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private_key = self._get_key(password)
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firma = private_key.sign(data, padding.PKCS1v15(), hashes.SHA256())
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return base64.b64encode(firma).decode()
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def _sign_with_pem(self, data, name_hash):
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if name_hash == 'sha256':
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type_hash = hashes.SHA256()
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elif name_hash == 'sha1':
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type_hash = hashes.SHA1()
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firma = self._key_pem.sign(data, padding.PKCS1v15(), type_hash)
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return base64.b64encode(firma).decode()
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def sign_sha1(self, data, password=''):
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if self._key_pem:
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return self._sign_with_pem(data, 'sha1')
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private_key = self._get_key(password)
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firma = private_key.sign(data, padding.PKCS1v15(), hashes.SHA1())
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return base64.b64encode(firma).decode()
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def sign_xml(self, tree):
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import xmlsec
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node = xmlsec.tree.find_node(tree, xmlsec.constants.NodeSignature)
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ctx = xmlsec.SignatureContext()
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key = xmlsec.Key.from_memory(self.key_pem, xmlsec.constants.KeyDataFormatPem)
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ctx.key = key
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ctx.sign(node)
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node = xmlsec.tree.find_node(tree, 'X509Certificate')
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node.text = self.cer_txt
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return tree
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@property
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def rfc(self):
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return self._rfc
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@property
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def serial_number(self):
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return self._serial_number
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@property
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def serial_number2(self):
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return self._serial_number2
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@property
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def not_before(self):
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return self._not_before
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@property
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def not_after(self):
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return self._not_after
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@property
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def is_fiel(self):
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return self._is_fiel
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@property
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def are_couple(self):
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return self._are_couple
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@property
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def is_valid(self):
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return not bool(self.error)
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@property
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def is_valid_time(self):
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return self._is_valid_time
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@property
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def cer_pem(self):
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return self._cer_pem.encode()
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@property
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def cer_txt(self):
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return self._cer_txt
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@property
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def key_pem(self):
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return self._get_key_pem()
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@property
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def key_enc(self):
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return self._key_enc
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@property
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def issuer(self):
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return self._issuer
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@property
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def p12(self):
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return self._get_p12()
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@property
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def error(self):
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return self._error
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