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annotate lib/python3.8/site-packages/setuptools/ssl_support.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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0
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1 import os
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2 import socket
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3 import atexit
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4 import re
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5 import functools
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6
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7 from setuptools.extern.six.moves import urllib, http_client, map, filter
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8
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9 from pkg_resources import ResolutionError, ExtractionError
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10
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11 try:
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12 import ssl
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13 except ImportError:
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14 ssl = None
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15
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16 __all__ = [
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17 'VerifyingHTTPSHandler', 'find_ca_bundle', 'is_available', 'cert_paths',
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18 'opener_for'
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19 ]
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20
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21 cert_paths = """
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22 /etc/pki/tls/certs/ca-bundle.crt
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23 /etc/ssl/certs/ca-certificates.crt
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24 /usr/share/ssl/certs/ca-bundle.crt
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25 /usr/local/share/certs/ca-root.crt
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26 /etc/ssl/cert.pem
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27 /System/Library/OpenSSL/certs/cert.pem
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28 /usr/local/share/certs/ca-root-nss.crt
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29 /etc/ssl/ca-bundle.pem
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30 """.strip().split()
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31
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32 try:
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33 HTTPSHandler = urllib.request.HTTPSHandler
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34 HTTPSConnection = http_client.HTTPSConnection
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35 except AttributeError:
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36 HTTPSHandler = HTTPSConnection = object
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37
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38 is_available = ssl is not None and object not in (
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39 HTTPSHandler, HTTPSConnection)
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40
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41
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42 try:
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43 from ssl import CertificateError, match_hostname
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44 except ImportError:
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45 try:
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46 from backports.ssl_match_hostname import CertificateError
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47 from backports.ssl_match_hostname import match_hostname
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48 except ImportError:
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49 CertificateError = None
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50 match_hostname = None
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51
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52 if not CertificateError:
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53
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54 class CertificateError(ValueError):
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55 pass
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56
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57
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58 if not match_hostname:
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59
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60 def _dnsname_match(dn, hostname, max_wildcards=1):
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61 """Matching according to RFC 6125, section 6.4.3
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62
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63 https://tools.ietf.org/html/rfc6125#section-6.4.3
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64 """
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65 pats = []
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66 if not dn:
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67 return False
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68
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69 # Ported from python3-syntax:
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70 # leftmost, *remainder = dn.split(r'.')
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71 parts = dn.split(r'.')
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72 leftmost = parts[0]
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73 remainder = parts[1:]
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74
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75 wildcards = leftmost.count('*')
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76 if wildcards > max_wildcards:
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77 # Issue #17980: avoid denials of service by refusing more
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78 # than one wildcard per fragment. A survey of established
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79 # policy among SSL implementations showed it to be a
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80 # reasonable choice.
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81 raise CertificateError(
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82 "too many wildcards in certificate DNS name: " + repr(dn))
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83
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84 # speed up common case w/o wildcards
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85 if not wildcards:
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86 return dn.lower() == hostname.lower()
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87
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88 # RFC 6125, section 6.4.3, subitem 1.
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89 # The client SHOULD NOT attempt to match a
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90 # presented identifier in which the wildcard
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91 # character comprises a label other than the
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92 # left-most label.
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93 if leftmost == '*':
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94 # When '*' is a fragment by itself, it matches a non-empty dotless
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95 # fragment.
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96 pats.append('[^.]+')
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97 elif leftmost.startswith('xn--') or hostname.startswith('xn--'):
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98 # RFC 6125, section 6.4.3, subitem 3.
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99 # The client SHOULD NOT attempt to match a presented identifier
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100 # where the wildcard character is embedded within an A-label or
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101 # U-label of an internationalized domain name.
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102 pats.append(re.escape(leftmost))
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103 else:
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104 # Otherwise, '*' matches any dotless string, e.g. www*
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105 pats.append(re.escape(leftmost).replace(r'\*', '[^.]*'))
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106
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107 # add the remaining fragments, ignore any wildcards
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108 for frag in remainder:
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109 pats.append(re.escape(frag))
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110
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111 pat = re.compile(r'\A' + r'\.'.join(pats) + r'\Z', re.IGNORECASE)
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112 return pat.match(hostname)
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113
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114 def match_hostname(cert, hostname):
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115 """Verify that *cert* (in decoded format as returned by
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116 SSLSocket.getpeercert()) matches the *hostname*. RFC 2818 and RFC 6125
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117 rules are followed, but IP addresses are not accepted for *hostname*.
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118
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119 CertificateError is raised on failure. On success, the function
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120 returns nothing.
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121 """
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122 if not cert:
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123 raise ValueError("empty or no certificate")
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124 dnsnames = []
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125 san = cert.get('subjectAltName', ())
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126 for key, value in san:
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127 if key == 'DNS':
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diff changeset
128 if _dnsname_match(value, hostname):
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129 return
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130 dnsnames.append(value)
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diff changeset
131 if not dnsnames:
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132 # The subject is only checked when there is no dNSName entry
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133 # in subjectAltName
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134 for sub in cert.get('subject', ()):
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diff changeset
135 for key, value in sub:
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136 # XXX according to RFC 2818, the most specific Common Name
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137 # must be used.
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138 if key == 'commonName':
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139 if _dnsname_match(value, hostname):
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140 return
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141 dnsnames.append(value)
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142 if len(dnsnames) > 1:
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143 raise CertificateError(
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144 "hostname %r doesn't match either of %s"
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145 % (hostname, ', '.join(map(repr, dnsnames))))
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146 elif len(dnsnames) == 1:
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147 raise CertificateError(
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148 "hostname %r doesn't match %r"
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149 % (hostname, dnsnames[0]))
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150 else:
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151 raise CertificateError(
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152 "no appropriate commonName or "
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153 "subjectAltName fields were found")
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154
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155
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156 class VerifyingHTTPSHandler(HTTPSHandler):
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157 """Simple verifying handler: no auth, subclasses, timeouts, etc."""
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158
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159 def __init__(self, ca_bundle):
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160 self.ca_bundle = ca_bundle
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161 HTTPSHandler.__init__(self)
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162
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163 def https_open(self, req):
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164 return self.do_open(
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165 lambda host, **kw: VerifyingHTTPSConn(host, self.ca_bundle, **kw),
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diff changeset
166 req
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167 )
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168
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169
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170 class VerifyingHTTPSConn(HTTPSConnection):
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171 """Simple verifying connection: no auth, subclasses, timeouts, etc."""
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172
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173 def __init__(self, host, ca_bundle, **kw):
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174 HTTPSConnection.__init__(self, host, **kw)
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175 self.ca_bundle = ca_bundle
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176
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177 def connect(self):
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178 sock = socket.create_connection(
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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179 (self.host, self.port), getattr(self, 'source_address', None)
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180 )
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181
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182 # Handle the socket if a (proxy) tunnel is present
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183 if hasattr(self, '_tunnel') and getattr(self, '_tunnel_host', None):
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184 self.sock = sock
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185 self._tunnel()
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diff changeset
186 # http://bugs.python.org/issue7776: Python>=3.4.1 and >=2.7.7
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187 # change self.host to mean the proxy server host when tunneling is
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188 # being used. Adapt, since we are interested in the destination
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189 # host for the match_hostname() comparison.
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190 actual_host = self._tunnel_host
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191 else:
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192 actual_host = self.host
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193
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194 if hasattr(ssl, 'create_default_context'):
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195 ctx = ssl.create_default_context(cafile=self.ca_bundle)
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196 self.sock = ctx.wrap_socket(sock, server_hostname=actual_host)
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197 else:
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198 # This is for python < 2.7.9 and < 3.4?
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199 self.sock = ssl.wrap_socket(
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200 sock, cert_reqs=ssl.CERT_REQUIRED, ca_certs=self.ca_bundle
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201 )
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guerler
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diff changeset
202 try:
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203 match_hostname(self.sock.getpeercert(), actual_host)
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204 except CertificateError:
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205 self.sock.shutdown(socket.SHUT_RDWR)
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206 self.sock.close()
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guerler
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diff changeset
207 raise
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guerler
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208
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diff changeset
209
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210 def opener_for(ca_bundle=None):
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211 """Get a urlopen() replacement that uses ca_bundle for verification"""
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212 return urllib.request.build_opener(
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213 VerifyingHTTPSHandler(ca_bundle or find_ca_bundle())
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guerler
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diff changeset
214 ).open
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guerler
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diff changeset
215
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216
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217 # from jaraco.functools
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218 def once(func):
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diff changeset
219 @functools.wraps(func)
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220 def wrapper(*args, **kwargs):
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diff changeset
221 if not hasattr(func, 'always_returns'):
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diff changeset
222 func.always_returns = func(*args, **kwargs)
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parents:
diff changeset
223 return func.always_returns
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guerler
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diff changeset
224 return wrapper
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guerler
parents:
diff changeset
225
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
226
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guerler
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diff changeset
227 @once
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228 def get_win_certfile():
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diff changeset
229 try:
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230 import wincertstore
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diff changeset
231 except ImportError:
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diff changeset
232 return None
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guerler
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diff changeset
233
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diff changeset
234 class CertFile(wincertstore.CertFile):
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parents:
diff changeset
235 def __init__(self):
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diff changeset
236 super(CertFile, self).__init__()
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diff changeset
237 atexit.register(self.close)
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parents:
diff changeset
238
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guerler
parents:
diff changeset
239 def close(self):
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guerler
parents:
diff changeset
240 try:
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guerler
parents:
diff changeset
241 super(CertFile, self).close()
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
242 except OSError:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
243 pass
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
244
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guerler
parents:
diff changeset
245 _wincerts = CertFile()
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
246 _wincerts.addstore('CA')
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diff changeset
247 _wincerts.addstore('ROOT')
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parents:
diff changeset
248 return _wincerts.name
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249
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guerler
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250
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parents:
diff changeset
251 def find_ca_bundle():
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diff changeset
252 """Return an existing CA bundle path, or None"""
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guerler
parents:
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253 extant_cert_paths = filter(os.path.isfile, cert_paths)
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254 return (
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255 get_win_certfile()
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256 or next(extant_cert_paths, None)
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257 or _certifi_where()
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258 )
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259
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260
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261 def _certifi_where():
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262 try:
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263 return __import__('certifi').where()
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264 except (ImportError, ResolutionError, ExtractionError):
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265 pass