verify payment requests with tlslite and pyasn1 (pure python) instead of m2Crypto
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ThomasV
214
lib/x509.py
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214
lib/x509.py
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#!/usr/bin/env python
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#
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# Electrum - lightweight Bitcoin client
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# Copyright (C) 2014 Thomas Voegtlin
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from datetime import datetime, timedelta
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try:
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import pyasn1
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except ImportError:
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sys.exit("Error: pyasn1 does not seem to be installed. Try 'sudo pip install pyasn1'")
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try:
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import tlslite
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except ImportError:
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sys.exit("Error: tlslite does not seem to be installed. Try 'sudo pip install tlslite'")
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from pyasn1.codec.der import decoder, encoder
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from pyasn1.type.univ import Any, ObjectIdentifier, OctetString
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from pyasn1.type.char import BMPString, IA5String, UTF8String
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from pyasn1.type.useful import GeneralizedTime
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from pyasn1_modules.rfc2459 import (Certificate, DirectoryString,
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SubjectAltName, GeneralNames,
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GeneralName)
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from pyasn1_modules.rfc2459 import id_ce_subjectAltName as SUBJECT_ALT_NAME
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from pyasn1_modules.rfc2459 import id_at_commonName as COMMON_NAME
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from pyasn1_modules.rfc2459 import id_at_organizationalUnitName as OU_NAME
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from pyasn1_modules.rfc2459 import id_ce_basicConstraints, BasicConstraints
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XMPP_ADDR = ObjectIdentifier('1.3.6.1.5.5.7.8.5')
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SRV_NAME = ObjectIdentifier('1.3.6.1.5.5.7.8.7')
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ALGO_RSA_SHA1 = ObjectIdentifier('1.2.840.113549.1.1.5')
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class CertificateError(Exception):
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pass
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def decode_str(data):
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encoding = 'utf-16-be' if isinstance(data, BMPString) else 'utf-8'
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return bytes(data).decode(encoding)
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class X509(tlslite.X509):
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""" Child class of tlslite.X509 that uses pyasn1 """
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def slow_parse(self):
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self.cert = decoder.decode(str(self.bytes), asn1Spec=Certificate())[0]
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self.tbs = self.cert.getComponentByName('tbsCertificate')
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self.subject = self.tbs.getComponentByName('subject')
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self.extensions = self.tbs.getComponentByName('extensions') or []
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def extract_names(self):
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results = {'CN': None,
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'DNS': set(),
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'SRV': set(),
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'URI': set(),
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'XMPPAddr': set(),
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'OU': None,}
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# Extract the CommonName(s) from the cert.
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for rdnss in self.subject:
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for rdns in rdnss:
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for name in rdns:
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oid = name.getComponentByName('type')
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value = name.getComponentByName('value')
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if oid == COMMON_NAME:
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value = decoder.decode(value, asn1Spec=DirectoryString())[0]
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value = decode_str(value.getComponent())
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results['CN'] = value
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elif oid == OU_NAME:
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value = decoder.decode(value, asn1Spec=DirectoryString())[0]
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value = decode_str(value.getComponent())
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results['OU'] = value
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# Extract the Subject Alternate Names (DNS, SRV, URI, XMPPAddr)
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for extension in self.extensions:
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oid = extension.getComponentByName('extnID')
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if oid != SUBJECT_ALT_NAME:
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continue
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value = decoder.decode(extension.getComponentByName('extnValue'),
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asn1Spec=OctetString())[0]
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sa_names = decoder.decode(value, asn1Spec=SubjectAltName())[0]
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for name in sa_names:
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name_type = name.getName()
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if name_type == 'dNSName':
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results['DNS'].add(decode_str(name.getComponent()))
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if name_type == 'uniformResourceIdentifier':
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value = decode_str(name.getComponent())
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if value.startswith('xmpp:'):
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results['URI'].add(value[5:])
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elif name_type == 'otherName':
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name = name.getComponent()
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oid = name.getComponentByName('type-id')
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value = name.getComponentByName('value')
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if oid == XMPP_ADDR:
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value = decoder.decode(value, asn1Spec=UTF8String())[0]
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results['XMPPAddr'].add(decode_str(value))
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elif oid == SRV_NAME:
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value = decoder.decode(value, asn1Spec=IA5String())[0]
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results['SRV'].add(decode_str(value))
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return results
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def check_ca(self):
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for extension in self.extensions:
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oid = extension.getComponentByName('extnID')
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if oid != id_ce_basicConstraints:
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continue
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value = decoder.decode(extension.getComponentByName('extnValue'),
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asn1Spec=OctetString())[0]
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constraints = decoder.decode(value, asn1Spec=BasicConstraints())[0]
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return bool(constraints[0])
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def extract_sig(self):
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signature = self.cert.getComponentByName('signatureValue')
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algorithm = self.cert.getComponentByName('signatureAlgorithm')
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data = encoder.encode(self.tbs)
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s = encoder.encode(signature)
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return algorithm, s, data
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def extract_pubkey(self):
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pki = self.tbs.getComponentByName('subjectPublicKeyInfo')
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algo = pki.getComponentByName('algorithm')
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algorithm = algo.getComponentByName('algorithm')
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parameters = algo.getComponentByName('parameters')
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subjectPublicKey = pki.getComponentByName('subjectPublicKey')
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return algorithm, parameters, encoder.encode(subjectPublicKey)
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def extract_dates(self):
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validity = self.tbs.getComponentByName('validity')
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not_before = validity.getComponentByName('notBefore')
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not_before = str(not_before.getComponent())
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not_after = validity.getComponentByName('notAfter')
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not_after = str(not_after.getComponent())
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if isinstance(not_before, GeneralizedTime):
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not_before = datetime.strptime(not_before, '%Y%m%d%H%M%SZ')
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else:
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not_before = datetime.strptime(not_before, '%y%m%d%H%M%SZ')
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if isinstance(not_after, GeneralizedTime):
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not_after = datetime.strptime(not_after, '%Y%m%d%H%M%SZ')
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else:
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not_after = datetime.strptime(not_after, '%y%m%d%H%M%SZ')
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return not_before, not_after
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def get_ttl(self):
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not_before, not_after = self.extract_dates()
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if not_after is None:
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return None
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return not_after - datetime.utcnow()
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def check_name(self, expected):
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not_before, not_after = self.extract_dates()
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cert_names = self.extract_names()
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now = datetime.utcnow()
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if not_before > now:
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raise CertificateError(
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'Certificate has not entered its valid date range.')
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if not_after <= now:
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raise CertificateError(
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'Certificate has expired.')
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if '.' in expected:
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expected_wild = expected[expected.index('.'):]
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else:
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expected_wild = expected
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expected_srv = '_xmpp-client.%s' % expected
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for name in cert_names['XMPPAddr']:
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if name == expected:
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return True
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for name in cert_names['SRV']:
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if name == expected_srv or name == expected:
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return True
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for name in cert_names['DNS']:
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if name == expected:
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return True
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if name.startswith('*'):
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if '.' in name:
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name_wild = name[name.index('.'):]
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else:
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name_wild = name
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if expected_wild == name_wild:
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return True
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for name in cert_names['URI']:
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if name == expected:
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return True
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if cert_names['CN'] == expected:
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return True
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raise CertificateError(
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'Could not match certficate against hostname: %s' % expected)
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class X509CertChain(tlslite.X509CertChain):
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pass
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