297 lines
9.6 KiB
Python
297 lines
9.6 KiB
Python
#!/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
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import sys
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import tlslite
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import util
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from util import profiler, print_error
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from asn1tinydecoder import asn1_node_root, asn1_get_all, asn1_get_value, \
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asn1_get_value_of_type, asn1_node_next, asn1_node_first_child, \
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asn1_read_length, asn1_node_is_child_of, \
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bytestr_to_int, bitstr_to_bytestr
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# workaround https://github.com/trevp/tlslite/issues/15
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tlslite.utils.cryptomath.pycryptoLoaded = False
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# algo OIDs
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ALGO_RSA_SHA1 = '1.2.840.113549.1.1.5'
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ALGO_RSA_SHA256 = '1.2.840.113549.1.1.11'
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ALGO_RSA_SHA384 = '1.2.840.113549.1.1.12'
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ALGO_RSA_SHA512 = '1.2.840.113549.1.1.13'
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ALGO_ECDSA_SHA256 = '1.2.840.10045.4.3.2'
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# prefixes, see http://stackoverflow.com/questions/3713774/c-sharp-how-to-calculate-asn-1-der-encoding-of-a-particular-hash-algorithm
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PREFIX_RSA_SHA256 = bytearray([0x30,0x31,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x01,0x05,0x00,0x04,0x20])
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PREFIX_RSA_SHA384 = bytearray([0x30,0x41,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x02,0x05,0x00,0x04,0x30])
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PREFIX_RSA_SHA512 = bytearray([0x30,0x51,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x03,0x05,0x00,0x04,0x40])
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class CertificateError(Exception):
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pass
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def decode_OID(s):
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s = map(ord, s)
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r = []
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r.append(s[0] / 40)
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r.append(s[0] % 40)
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k = 0
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for i in s[1:]:
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if i < 128:
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r.append(i + 128*k)
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k = 0
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else:
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k = (i - 128) + 128*k
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return '.'.join(map(str, r))
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def encode_OID(oid):
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x = map(int, oid.split('.'))
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s = chr(x[0]*40 + x[1])
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for i in x[2:]:
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ss = chr(i % 128)
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while i > 128:
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i = i / 128
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ss = chr(128 + i % 128) + ss
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s += ss
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return s
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def asn1_get_children(der, i):
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nodes = []
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ii = asn1_node_first_child(der,i)
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nodes.append(ii)
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while ii[2]<i[2]:
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ii = asn1_node_next(der,ii)
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nodes.append(ii)
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return nodes
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def asn1_get_sequence(s):
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return map(lambda j: asn1_get_value(s, j), asn1_get_children(s, asn1_node_root(s)))
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def asn1_get_dict(der, i):
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p = {}
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for ii in asn1_get_children(der, i):
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for iii in asn1_get_children(der, ii):
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iiii = asn1_node_first_child(der, iii)
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oid = decode_OID(asn1_get_value_of_type(der, iiii, 'OBJECT IDENTIFIER'))
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iiii = asn1_node_next(der, iiii)
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value = asn1_get_value(der, iiii)
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p[oid] = value
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return p
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class X509(tlslite.X509):
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def parseBinary(self, b):
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# call tlslite method first
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tlslite.X509.parseBinary(self, b)
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der = str(b)
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root = asn1_node_root(der)
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cert = asn1_node_first_child(der, root)
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# data for signature
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self.data = asn1_get_all(der, cert)
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# optional version field
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if asn1_get_value(der, cert)[0] == chr(0xa0):
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version = asn1_node_first_child(der, cert)
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serial_number = asn1_node_next(der, version)
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else:
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serial_number = asn1_node_first_child(der, cert)
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self.serial_number = bytestr_to_int(asn1_get_value_of_type(der, serial_number, 'INTEGER'))
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# signature algorithm
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sig_algo = asn1_node_next(der, serial_number)
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ii = asn1_node_first_child(der, sig_algo)
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self.sig_algo = decode_OID(asn1_get_value_of_type(der, ii, 'OBJECT IDENTIFIER'))
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# issuer
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issuer = asn1_node_next(der, sig_algo)
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self.issuer = asn1_get_dict(der, issuer)
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# validity
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validity = asn1_node_next(der, issuer)
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ii = asn1_node_first_child(der, validity)
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self.notBefore = asn1_get_value_of_type(der, ii, 'UTCTime')
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ii = asn1_node_next(der,ii)
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self.notAfter = asn1_get_value_of_type(der, ii, 'UTCTime')
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# subject
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subject = asn1_node_next(der, validity)
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self.subject = asn1_get_dict(der, subject)
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subject_pki = asn1_node_next(der, subject)
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# extensions
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self.CA = False
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self.AKI = None
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self.SKI = None
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i = subject_pki
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while i[2] < cert[2]:
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i = asn1_node_next(der, i)
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d = asn1_get_dict(der, i)
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for oid, value in d.items():
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if oid == '2.5.29.19':
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# Basic Constraints
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self.CA = bool(value)
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elif oid == '2.5.29.14':
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# Subject Key Identifier
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r = asn1_node_root(value)
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value = asn1_get_value_of_type(value, r, 'OCTET STRING')
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self.SKI = value.encode('hex')
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elif oid == '2.5.29.35':
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# Authority Key Identifier
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self.AKI = asn1_get_sequence(value)[0].encode('hex')
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else:
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pass
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# cert signature
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cert_sig_algo = asn1_node_next(der, cert)
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ii = asn1_node_first_child(der, cert_sig_algo)
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self.cert_sig_algo = decode_OID(asn1_get_value_of_type(der, ii, 'OBJECT IDENTIFIER'))
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cert_sig = asn1_node_next(der, cert_sig_algo)
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self.signature = asn1_get_value(der, cert_sig)[1:]
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def get_keyID(self):
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# http://security.stackexchange.com/questions/72077/validating-an-ssl-certificate-chain-according-to-rfc-5280-am-i-understanding-th
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return self.SKI if self.SKI else repr(self.subject)
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def get_issuer_keyID(self):
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return self.AKI if self.AKI else repr(self.issuer)
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def get_common_name(self):
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return self.subject.get('2.5.4.3', 'unknown')
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def get_signature(self):
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return self.cert_sig_algo, self.signature, self.data
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def check_ca(self):
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return self.CA
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def check_date(self):
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import time
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now = time.time()
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TIMESTAMP_FMT = '%y%m%d%H%M%SZ'
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not_before = time.mktime(time.strptime(self.notBefore, TIMESTAMP_FMT))
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not_after = time.mktime(time.strptime(self.notAfter, TIMESTAMP_FMT))
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if not_before > now:
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raise CertificateError('Certificate has not entered its valid date range.')
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if not_after <= now:
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raise CertificateError('Certificate has expired.')
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class X509CertChain(tlslite.X509CertChain):
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pass
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@profiler
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def load_certificates(ca_path):
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ca_list = {}
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ca_keyID = {}
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with open(ca_path, 'r') as f:
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s = f.read()
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bList = tlslite.utils.pem.dePemList(s, "CERTIFICATE")
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for b in bList:
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x = X509()
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try:
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x.parseBinary(b)
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x.check_date()
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except BaseException as e:
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util.print_error("cert error:", e)
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continue
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fp = x.getFingerprint()
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ca_list[fp] = x
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ca_keyID[x.get_keyID()] = fp
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return ca_list, ca_keyID
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def int_to_bytestr(i):
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s = chr(i % 256)
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while i > 256:
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i >>= 8
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s = chr(i % 256) + s
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return s
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def create_csr(commonName, challenge, k):
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import ecdsa, hashlib
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from bitcoin import point_to_ser
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private_key = ecdsa.SigningKey.from_string(k, curve = ecdsa.SECP256k1)
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public_key = private_key.get_verifying_key()
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pubkey = point_to_ser(public_key.pubkey.point, False)
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asn1_type_table = {
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'BOOLEAN': 0x01, 'INTEGER': 0x02,
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'BIT STRING': 0x03, 'OCTET STRING': 0x04,
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'NULL': 0x05, 'OBJECT IDENTIFIER': 0x06,
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'SEQUENCE': 0x30, 'SET': 0x31,
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'PrintableString': 0x13, 'IA5String': 0x16,
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'UTCTime': 0x17, 'ENUMERATED': 0x0A,
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'UTF8String': 0x0C, 'PrintableString': 0x13,
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}
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def x(t, s):
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c = asn1_type_table[t] & 0x3f if type(t) == str else t
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l = len(s)
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if l < 128:
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ls = chr(l)
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else:
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n = int_to_bytestr(l)
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ls = chr(len(n) + 128) + n
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return chr(c) + ls + s
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x_int = lambda i: x('INTEGER', int_to_bytestr(i))
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x_seq = lambda *items: x('SEQUENCE', ''.join(items))
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x_bitstring = lambda s: x('BIT STRING', s)
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x_utf8 = lambda s: x('UTF8String', s)
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x_set = lambda *items: x('SET', ''.join(items))
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x_printable = lambda s: x('PrintableString', s)
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x_obj = lambda oid: x('OBJECT IDENTIFIER', encode_OID(oid))
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body = x_seq(
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x_int(0),
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x_seq(
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x_set(x_seq(x_obj('2.5.4.3'), x_utf8(commonName)))
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),
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x_seq(
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x_seq(
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x_obj('1.2.840.10045.2.1'),
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x_obj('1.3.132.0.10')
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),
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x_bitstring(chr(0) + pubkey)
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),
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x(0xa0, x_seq(x_obj('1.2.840.113549.1.9.7'), x_set(x_utf8(challenge)))
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)
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)
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signature = private_key.sign_deterministic(body, hashfunc=hashlib.sha256, sigencode = ecdsa.util.sigencode_der)
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assert public_key.verify(signature, body, hashfunc=hashlib.sha256, sigdecode = ecdsa.util.sigdecode_der)
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csr = x_seq(
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body,
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x_seq(x_obj(ALGO_ECDSA_SHA256)),
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x_bitstring(chr(0) + signature)
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)
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return csr
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