annotate planemo/lib/python3.7/site-packages/urllib3/util/ssl_.py @ 1:56ad4e20f292 draft

"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 from __future__ import absolute_import
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2 import errno
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3 import warnings
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4 import hmac
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5 import os
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6 import sys
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7
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8 from binascii import hexlify, unhexlify
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9 from hashlib import md5, sha1, sha256
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10
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11 from .url import IPV4_RE, BRACELESS_IPV6_ADDRZ_RE
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12 from ..exceptions import SSLError, InsecurePlatformWarning, SNIMissingWarning
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13 from ..packages import six
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14
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15
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16 SSLContext = None
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17 HAS_SNI = False
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18 IS_PYOPENSSL = False
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19 IS_SECURETRANSPORT = False
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20
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21 # Maps the length of a digest to a possible hash function producing this digest
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22 HASHFUNC_MAP = {32: md5, 40: sha1, 64: sha256}
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23
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24
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25 def _const_compare_digest_backport(a, b):
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26 """
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27 Compare two digests of equal length in constant time.
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28
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29 The digests must be of type str/bytes.
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30 Returns True if the digests match, and False otherwise.
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31 """
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32 result = abs(len(a) - len(b))
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33 for left, right in zip(bytearray(a), bytearray(b)):
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34 result |= left ^ right
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35 return result == 0
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36
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37
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38 _const_compare_digest = getattr(hmac, "compare_digest", _const_compare_digest_backport)
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39
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40 try: # Test for SSL features
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41 import ssl
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42 from ssl import wrap_socket, CERT_REQUIRED
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43 from ssl import HAS_SNI # Has SNI?
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44 except ImportError:
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45 pass
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46
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47 try: # Platform-specific: Python 3.6
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48 from ssl import PROTOCOL_TLS
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49
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50 PROTOCOL_SSLv23 = PROTOCOL_TLS
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51 except ImportError:
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52 try:
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53 from ssl import PROTOCOL_SSLv23 as PROTOCOL_TLS
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54
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55 PROTOCOL_SSLv23 = PROTOCOL_TLS
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56 except ImportError:
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57 PROTOCOL_SSLv23 = PROTOCOL_TLS = 2
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58
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59
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60 try:
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61 from ssl import OP_NO_SSLv2, OP_NO_SSLv3, OP_NO_COMPRESSION
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62 except ImportError:
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63 OP_NO_SSLv2, OP_NO_SSLv3 = 0x1000000, 0x2000000
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64 OP_NO_COMPRESSION = 0x20000
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65
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66
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67 # A secure default.
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68 # Sources for more information on TLS ciphers:
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69 #
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70 # - https://wiki.mozilla.org/Security/Server_Side_TLS
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71 # - https://www.ssllabs.com/projects/best-practices/index.html
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72 # - https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
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73 #
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74 # The general intent is:
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75 # - prefer cipher suites that offer perfect forward secrecy (DHE/ECDHE),
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76 # - prefer ECDHE over DHE for better performance,
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77 # - prefer any AES-GCM and ChaCha20 over any AES-CBC for better performance and
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78 # security,
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79 # - prefer AES-GCM over ChaCha20 because hardware-accelerated AES is common,
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80 # - disable NULL authentication, MD5 MACs, DSS, and other
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81 # insecure ciphers for security reasons.
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82 # - NOTE: TLS 1.3 cipher suites are managed through a different interface
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83 # not exposed by CPython (yet!) and are enabled by default if they're available.
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84 DEFAULT_CIPHERS = ":".join(
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85 [
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86 "ECDHE+AESGCM",
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87 "ECDHE+CHACHA20",
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88 "DHE+AESGCM",
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89 "DHE+CHACHA20",
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90 "ECDH+AESGCM",
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91 "DH+AESGCM",
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92 "ECDH+AES",
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93 "DH+AES",
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94 "RSA+AESGCM",
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95 "RSA+AES",
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96 "!aNULL",
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97 "!eNULL",
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98 "!MD5",
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99 "!DSS",
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100 ]
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101 )
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102
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103 try:
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104 from ssl import SSLContext # Modern SSL?
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105 except ImportError:
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106
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107 class SSLContext(object): # Platform-specific: Python 2
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108 def __init__(self, protocol_version):
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109 self.protocol = protocol_version
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110 # Use default values from a real SSLContext
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111 self.check_hostname = False
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112 self.verify_mode = ssl.CERT_NONE
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113 self.ca_certs = None
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114 self.options = 0
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115 self.certfile = None
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116 self.keyfile = None
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117 self.ciphers = None
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118
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119 def load_cert_chain(self, certfile, keyfile):
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120 self.certfile = certfile
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121 self.keyfile = keyfile
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122
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123 def load_verify_locations(self, cafile=None, capath=None, cadata=None):
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124 self.ca_certs = cafile
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125
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126 if capath is not None:
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127 raise SSLError("CA directories not supported in older Pythons")
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128
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129 if cadata is not None:
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130 raise SSLError("CA data not supported in older Pythons")
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131
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132 def set_ciphers(self, cipher_suite):
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133 self.ciphers = cipher_suite
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134
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135 def wrap_socket(self, socket, server_hostname=None, server_side=False):
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136 warnings.warn(
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137 "A true SSLContext object is not available. This prevents "
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138 "urllib3 from configuring SSL appropriately and may cause "
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139 "certain SSL connections to fail. You can upgrade to a newer "
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140 "version of Python to solve this. For more information, see "
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141 "https://urllib3.readthedocs.io/en/latest/advanced-usage.html"
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142 "#ssl-warnings",
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143 InsecurePlatformWarning,
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144 )
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145 kwargs = {
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146 "keyfile": self.keyfile,
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147 "certfile": self.certfile,
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148 "ca_certs": self.ca_certs,
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149 "cert_reqs": self.verify_mode,
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150 "ssl_version": self.protocol,
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151 "server_side": server_side,
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152 }
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153 return wrap_socket(socket, ciphers=self.ciphers, **kwargs)
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154
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155
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156 def assert_fingerprint(cert, fingerprint):
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157 """
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158 Checks if given fingerprint matches the supplied certificate.
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159
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160 :param cert:
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161 Certificate as bytes object.
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162 :param fingerprint:
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163 Fingerprint as string of hexdigits, can be interspersed by colons.
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164 """
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165
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166 fingerprint = fingerprint.replace(":", "").lower()
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167 digest_length = len(fingerprint)
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168 hashfunc = HASHFUNC_MAP.get(digest_length)
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169 if not hashfunc:
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170 raise SSLError("Fingerprint of invalid length: {0}".format(fingerprint))
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171
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172 # We need encode() here for py32; works on py2 and p33.
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173 fingerprint_bytes = unhexlify(fingerprint.encode())
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174
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175 cert_digest = hashfunc(cert).digest()
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176
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177 if not _const_compare_digest(cert_digest, fingerprint_bytes):
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178 raise SSLError(
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179 'Fingerprints did not match. Expected "{0}", got "{1}".'.format(
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180 fingerprint, hexlify(cert_digest)
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181 )
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182 )
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183
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184
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185 def resolve_cert_reqs(candidate):
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186 """
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187 Resolves the argument to a numeric constant, which can be passed to
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188 the wrap_socket function/method from the ssl module.
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189 Defaults to :data:`ssl.CERT_REQUIRED`.
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190 If given a string it is assumed to be the name of the constant in the
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191 :mod:`ssl` module or its abbreviation.
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192 (So you can specify `REQUIRED` instead of `CERT_REQUIRED`.
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193 If it's neither `None` nor a string we assume it is already the numeric
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194 constant which can directly be passed to wrap_socket.
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195 """
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196 if candidate is None:
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197 return CERT_REQUIRED
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198
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199 if isinstance(candidate, str):
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200 res = getattr(ssl, candidate, None)
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201 if res is None:
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202 res = getattr(ssl, "CERT_" + candidate)
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203 return res
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204
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205 return candidate
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206
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207
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208 def resolve_ssl_version(candidate):
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209 """
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210 like resolve_cert_reqs
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211 """
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212 if candidate is None:
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213 return PROTOCOL_TLS
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214
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215 if isinstance(candidate, str):
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216 res = getattr(ssl, candidate, None)
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217 if res is None:
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218 res = getattr(ssl, "PROTOCOL_" + candidate)
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219 return res
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220
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221 return candidate
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222
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223
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224 def create_urllib3_context(
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225 ssl_version=None, cert_reqs=None, options=None, ciphers=None
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226 ):
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227 """All arguments have the same meaning as ``ssl_wrap_socket``.
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228
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229 By default, this function does a lot of the same work that
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230 ``ssl.create_default_context`` does on Python 3.4+. It:
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231
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232 - Disables SSLv2, SSLv3, and compression
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233 - Sets a restricted set of server ciphers
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234
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235 If you wish to enable SSLv3, you can do::
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236
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237 from urllib3.util import ssl_
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238 context = ssl_.create_urllib3_context()
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239 context.options &= ~ssl_.OP_NO_SSLv3
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240
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241 You can do the same to enable compression (substituting ``COMPRESSION``
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242 for ``SSLv3`` in the last line above).
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243
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244 :param ssl_version:
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245 The desired protocol version to use. This will default to
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246 PROTOCOL_SSLv23 which will negotiate the highest protocol that both
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247 the server and your installation of OpenSSL support.
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248 :param cert_reqs:
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249 Whether to require the certificate verification. This defaults to
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250 ``ssl.CERT_REQUIRED``.
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251 :param options:
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252 Specific OpenSSL options. These default to ``ssl.OP_NO_SSLv2``,
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253 ``ssl.OP_NO_SSLv3``, ``ssl.OP_NO_COMPRESSION``.
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254 :param ciphers:
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255 Which cipher suites to allow the server to select.
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256 :returns:
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257 Constructed SSLContext object with specified options
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258 :rtype: SSLContext
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259 """
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260 context = SSLContext(ssl_version or PROTOCOL_TLS)
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261
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262 context.set_ciphers(ciphers or DEFAULT_CIPHERS)
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263
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264 # Setting the default here, as we may have no ssl module on import
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265 cert_reqs = ssl.CERT_REQUIRED if cert_reqs is None else cert_reqs
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266
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267 if options is None:
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268 options = 0
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269 # SSLv2 is easily broken and is considered harmful and dangerous
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270 options |= OP_NO_SSLv2
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271 # SSLv3 has several problems and is now dangerous
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272 options |= OP_NO_SSLv3
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273 # Disable compression to prevent CRIME attacks for OpenSSL 1.0+
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274 # (issue #309)
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275 options |= OP_NO_COMPRESSION
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276
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277 context.options |= options
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278
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279 # Enable post-handshake authentication for TLS 1.3, see GH #1634. PHA is
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280 # necessary for conditional client cert authentication with TLS 1.3.
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281 # The attribute is None for OpenSSL <= 1.1.0 or does not exist in older
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282 # versions of Python. We only enable on Python 3.7.4+ or if certificate
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283 # verification is enabled to work around Python issue #37428
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284 # See: https://bugs.python.org/issue37428
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285 if (cert_reqs == ssl.CERT_REQUIRED or sys.version_info >= (3, 7, 4)) and getattr(
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286 context, "post_handshake_auth", None
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287 ) is not None:
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288 context.post_handshake_auth = True
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289
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290 context.verify_mode = cert_reqs
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291 if (
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292 getattr(context, "check_hostname", None) is not None
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293 ): # Platform-specific: Python 3.2
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294 # We do our own verification, including fingerprints and alternative
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295 # hostnames. So disable it here
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296 context.check_hostname = False
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297
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298 # Enable logging of TLS session keys via defacto standard environment variable
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299 # 'SSLKEYLOGFILE', if the feature is available (Python 3.8+).
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300 if hasattr(context, "keylog_filename"):
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301 context.keylog_filename = os.environ.get("SSLKEYLOGFILE")
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302
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303 return context
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304
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305
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306 def ssl_wrap_socket(
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307 sock,
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308 keyfile=None,
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309 certfile=None,
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310 cert_reqs=None,
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311 ca_certs=None,
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312 server_hostname=None,
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313 ssl_version=None,
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314 ciphers=None,
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315 ssl_context=None,
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316 ca_cert_dir=None,
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317 key_password=None,
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318 ca_cert_data=None,
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319 ):
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320 """
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321 All arguments except for server_hostname, ssl_context, and ca_cert_dir have
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322 the same meaning as they do when using :func:`ssl.wrap_socket`.
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323
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324 :param server_hostname:
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325 When SNI is supported, the expected hostname of the certificate
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326 :param ssl_context:
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327 A pre-made :class:`SSLContext` object. If none is provided, one will
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328 be created using :func:`create_urllib3_context`.
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329 :param ciphers:
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330 A string of ciphers we wish the client to support.
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331 :param ca_cert_dir:
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332 A directory containing CA certificates in multiple separate files, as
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333 supported by OpenSSL's -CApath flag or the capath argument to
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334 SSLContext.load_verify_locations().
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335 :param key_password:
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336 Optional password if the keyfile is encrypted.
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337 :param ca_cert_data:
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338 Optional string containing CA certificates in PEM format suitable for
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339 passing as the cadata parameter to SSLContext.load_verify_locations()
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340 """
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341 context = ssl_context
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342 if context is None:
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343 # Note: This branch of code and all the variables in it are no longer
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344 # used by urllib3 itself. We should consider deprecating and removing
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345 # this code.
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346 context = create_urllib3_context(ssl_version, cert_reqs, ciphers=ciphers)
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347
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348 if ca_certs or ca_cert_dir or ca_cert_data:
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349 try:
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350 context.load_verify_locations(ca_certs, ca_cert_dir, ca_cert_data)
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351 except IOError as e: # Platform-specific: Python 2.7
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352 raise SSLError(e)
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353 # Py33 raises FileNotFoundError which subclasses OSError
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354 # These are not equivalent unless we check the errno attribute
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355 except OSError as e: # Platform-specific: Python 3.3 and beyond
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356 if e.errno == errno.ENOENT:
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357 raise SSLError(e)
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358 raise
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359
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360 elif ssl_context is None and hasattr(context, "load_default_certs"):
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361 # try to load OS default certs; works well on Windows (require Python3.4+)
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362 context.load_default_certs()
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363
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364 # Attempt to detect if we get the goofy behavior of the
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365 # keyfile being encrypted and OpenSSL asking for the
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366 # passphrase via the terminal and instead error out.
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367 if keyfile and key_password is None and _is_key_file_encrypted(keyfile):
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368 raise SSLError("Client private key is encrypted, password is required")
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369
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370 if certfile:
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371 if key_password is None:
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372 context.load_cert_chain(certfile, keyfile)
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373 else:
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374 context.load_cert_chain(certfile, keyfile, key_password)
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375
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376 # If we detect server_hostname is an IP address then the SNI
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377 # extension should not be used according to RFC3546 Section 3.1
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378 # We shouldn't warn the user if SNI isn't available but we would
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379 # not be using SNI anyways due to IP address for server_hostname.
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380 if (
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381 server_hostname is not None and not is_ipaddress(server_hostname)
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382 ) or IS_SECURETRANSPORT:
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383 if HAS_SNI and server_hostname is not None:
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384 return context.wrap_socket(sock, server_hostname=server_hostname)
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385
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386 warnings.warn(
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387 "An HTTPS request has been made, but the SNI (Server Name "
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388 "Indication) extension to TLS is not available on this platform. "
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389 "This may cause the server to present an incorrect TLS "
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390 "certificate, which can cause validation failures. You can upgrade to "
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391 "a newer version of Python to solve this. For more information, see "
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392 "https://urllib3.readthedocs.io/en/latest/advanced-usage.html"
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393 "#ssl-warnings",
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394 SNIMissingWarning,
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395 )
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396
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397 return context.wrap_socket(sock)
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398
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399
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400 def is_ipaddress(hostname):
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401 """Detects whether the hostname given is an IPv4 or IPv6 address.
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402 Also detects IPv6 addresses with Zone IDs.
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403
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404 :param str hostname: Hostname to examine.
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405 :return: True if the hostname is an IP address, False otherwise.
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406 """
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407 if not six.PY2 and isinstance(hostname, bytes):
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408 # IDN A-label bytes are ASCII compatible.
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409 hostname = hostname.decode("ascii")
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410 return bool(IPV4_RE.match(hostname) or BRACELESS_IPV6_ADDRZ_RE.match(hostname))
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411
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412
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413 def _is_key_file_encrypted(key_file):
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414 """Detects if a key file is encrypted or not."""
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415 with open(key_file, "r") as f:
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416 for line in f:
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417 # Look for Proc-Type: 4,ENCRYPTED
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418 if "ENCRYPTED" in line:
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419 return True
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420
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421 return False