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annotate env/lib/python3.7/site-packages/requests_toolbelt/adapters/x509.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 # -*- coding: utf-8 -*-
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2 """A X509Adapter for use with the requests library.
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3
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4 This file contains an implementation of the X509Adapter that will
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5 allow users to authenticate a request using an arbitrary
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6 X.509 certificate without needing to convert it to a .pem file
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7
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8 """
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9
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10 from OpenSSL.crypto import PKey, X509
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11 from cryptography import x509
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12 from cryptography.hazmat.primitives.serialization import (load_pem_private_key,
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13 load_der_private_key)
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14 from cryptography.hazmat.primitives.serialization import Encoding
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15 from cryptography.hazmat.backends import default_backend
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16
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17 from datetime import datetime
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18 from requests.adapters import HTTPAdapter
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19 import requests
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20
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21 from .._compat import PyOpenSSLContext
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22 from .. import exceptions as exc
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23
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24 """
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25 importing the protocol constants from _ssl instead of ssl because only the
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26 constants are needed and to handle issues caused by importing from ssl on
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27 the 2.7.x line.
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28 """
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29 try:
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30 from _ssl import PROTOCOL_TLS as PROTOCOL
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31 except ImportError:
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32 from _ssl import PROTOCOL_SSLv23 as PROTOCOL
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33
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34
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35 class X509Adapter(HTTPAdapter):
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36 r"""Adapter for use with X.509 certificates.
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37
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38 Provides an interface for Requests sessions to contact HTTPS urls and
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39 authenticate with an X.509 cert by implementing the Transport Adapter
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40 interface. This class will need to be manually instantiated and mounted
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41 to the session
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42
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43 :param pool_connections: The number of urllib3 connection pools to
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44 cache.
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45 :param pool_maxsize: The maximum number of connections to save in the
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46 pool.
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47 :param max_retries: The maximum number of retries each connection
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48 should attempt. Note, this applies only to failed DNS lookups,
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49 socket connections and connection timeouts, never to requests where
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50 data has made it to the server. By default, Requests does not retry
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51 failed connections. If you need granular control over the
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52 conditions under which we retry a request, import urllib3's
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53 ``Retry`` class and pass that instead.
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54 :param pool_block: Whether the connection pool should block for
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55 connections.
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56
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57 :param bytes cert_bytes:
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58 bytes object containing contents of a cryptography.x509Certificate
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59 object using the encoding specified by the ``encoding`` parameter.
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60 :param bytes pk_bytes:
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61 bytes object containing contents of a object that implements
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62 ``cryptography.hazmat.primitives.serialization.PrivateFormat``
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63 using the encoding specified by the ``encoding`` parameter.
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64 :param password:
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65 string or utf8 encoded bytes containing the passphrase used for the
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66 private key. None if unencrypted. Defaults to None.
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67 :param encoding:
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68 Enumeration detailing the encoding method used on the ``cert_bytes``
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69 parameter. Can be either PEM or DER. Defaults to PEM.
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70 :type encoding:
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71 :class: `cryptography.hazmat.primitives.serialization.Encoding`
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72
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73 Usage::
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74
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75 >>> import requests
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76 >>> from requests_toolbelt.adapters.x509 import X509Adapter
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77 >>> s = requests.Session()
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78 >>> a = X509Adapter(max_retries=3,
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79 cert_bytes=b'...', pk_bytes=b'...', encoding='...'
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80 >>> s.mount('https://', a)
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81 """
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82
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83 def __init__(self, *args, **kwargs):
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84 self._check_version()
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85 cert_bytes = kwargs.pop('cert_bytes', None)
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86 pk_bytes = kwargs.pop('pk_bytes', None)
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87 password = kwargs.pop('password', None)
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88 encoding = kwargs.pop('encoding', Encoding.PEM)
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89
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90 password_bytes = None
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91
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92 if cert_bytes is None or not isinstance(cert_bytes, bytes):
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93 raise ValueError('Invalid cert content provided. '
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94 'You must provide an X.509 cert '
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95 'formatted as a byte array.')
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96 if pk_bytes is None or not isinstance(pk_bytes, bytes):
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97 raise ValueError('Invalid private key content provided. '
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98 'You must provide a private key '
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99 'formatted as a byte array.')
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100
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101 if isinstance(password, bytes):
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102 password_bytes = password
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103 elif password:
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104 password_bytes = password.encode('utf8')
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105
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106 self.ssl_context = create_ssl_context(cert_bytes, pk_bytes,
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107 password_bytes, encoding)
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108
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109 super(X509Adapter, self).__init__(*args, **kwargs)
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110
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111 def init_poolmanager(self, *args, **kwargs):
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112 if self.ssl_context:
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113 kwargs['ssl_context'] = self.ssl_context
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114 return super(X509Adapter, self).init_poolmanager(*args, **kwargs)
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115
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116 def proxy_manager_for(self, *args, **kwargs):
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117 if self.ssl_context:
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118 kwargs['ssl_context'] = self.ssl_context
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119 return super(X509Adapter, self).proxy_manager_for(*args, **kwargs)
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120
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121 def _check_version(self):
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122 if PyOpenSSLContext is None:
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123 raise exc.VersionMismatchError(
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124 "The X509Adapter requires at least Requests 2.12.0 to be "
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125 "installed. Version {0} was found instead.".format(
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126 requests.__version__
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127 )
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128 )
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129
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130
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131 def check_cert_dates(cert):
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132 """Verify that the supplied client cert is not invalid."""
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133
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134 now = datetime.utcnow()
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135 if cert.not_valid_after < now or cert.not_valid_before > now:
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136 raise ValueError('Client certificate expired: Not After: '
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137 '{0:%Y-%m-%d %H:%M:%SZ} '
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138 'Not Before: {1:%Y-%m-%d %H:%M:%SZ}'
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139 .format(cert.not_valid_after, cert.not_valid_before))
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140
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141
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142 def create_ssl_context(cert_byes, pk_bytes, password=None,
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143 encoding=Encoding.PEM):
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144 """Create an SSL Context with the supplied cert/password.
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145
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146 :param cert_bytes array of bytes containing the cert encoded
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147 using the method supplied in the ``encoding`` parameter
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148 :param pk_bytes array of bytes containing the private key encoded
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149 using the method supplied in the ``encoding`` parameter
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150 :param password array of bytes containing the passphrase to be used
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151 with the supplied private key. None if unencrypted.
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152 Defaults to None.
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153 :param encoding ``cryptography.hazmat.primitives.serialization.Encoding``
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154 details the encoding method used on the ``cert_bytes`` and
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155 ``pk_bytes`` parameters. Can be either PEM or DER.
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156 Defaults to PEM.
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157 """
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158 backend = default_backend()
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159
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160 cert = None
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161 key = None
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162 if encoding == Encoding.PEM:
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163 cert = x509.load_pem_x509_certificate(cert_byes, backend)
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164 key = load_pem_private_key(pk_bytes, password, backend)
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165 elif encoding == Encoding.DER:
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166 cert = x509.load_der_x509_certificate(cert_byes, backend)
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167 key = load_der_private_key(pk_bytes, password, backend)
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168 else:
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169 raise ValueError('Invalid encoding provided: Must be PEM or DER')
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170
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171 if not (cert and key):
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172 raise ValueError('Cert and key could not be parsed from '
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173 'provided data')
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174 check_cert_dates(cert)
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175 ssl_context = PyOpenSSLContext(PROTOCOL)
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176 ssl_context._ctx.use_certificate(X509.from_cryptography(cert))
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177 ssl_context._ctx.use_privatekey(PKey.from_cryptography_key(key))
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178 return ssl_context