Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/setuptools/ssl_support.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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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
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6 import pkg_resources
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7 from pkg_resources import ResolutionError, ExtractionError
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8 from setuptools.compat import urllib2
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9
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10 try:
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11 import ssl
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12 except ImportError:
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13 ssl = None
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14
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15 __all__ = [
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16 'VerifyingHTTPSHandler', 'find_ca_bundle', 'is_available', 'cert_paths',
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17 'opener_for'
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18 ]
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19
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20 cert_paths = """
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21 /etc/pki/tls/certs/ca-bundle.crt
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22 /etc/ssl/certs/ca-certificates.crt
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23 /usr/share/ssl/certs/ca-bundle.crt
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24 /usr/local/share/certs/ca-root.crt
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25 /etc/ssl/cert.pem
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26 /System/Library/OpenSSL/certs/cert.pem
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27 """.strip().split()
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28
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29
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30 HTTPSHandler = HTTPSConnection = object
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31
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32 for what, where in (
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33 ('HTTPSHandler', ['urllib2','urllib.request']),
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34 ('HTTPSConnection', ['httplib', 'http.client']),
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35 ):
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36 for module in where:
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37 try:
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38 exec("from %s import %s" % (module, what))
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39 except ImportError:
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40 pass
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41
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42 is_available = ssl is not None and object not in (HTTPSHandler, HTTPSConnection)
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43
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44
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45 try:
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46 from ssl import CertificateError, match_hostname
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47 except ImportError:
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48 try:
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49 from backports.ssl_match_hostname import CertificateError
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50 from backports.ssl_match_hostname import match_hostname
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51 except ImportError:
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52 CertificateError = None
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53 match_hostname = None
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54
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55 if not CertificateError:
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56 class CertificateError(ValueError):
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57 pass
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58
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59 if not match_hostname:
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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 http://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 presented identifier in which
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90 # the wildcard character comprises a label other than the left-most label.
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91 if leftmost == '*':
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92 # When '*' is a fragment by itself, it matches a non-empty dotless
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93 # fragment.
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94 pats.append('[^.]+')
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95 elif leftmost.startswith('xn--') or hostname.startswith('xn--'):
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96 # RFC 6125, section 6.4.3, subitem 3.
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97 # The client SHOULD NOT attempt to match a presented identifier
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98 # where the wildcard character is embedded within an A-label or
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99 # U-label of an internationalized domain name.
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100 pats.append(re.escape(leftmost))
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101 else:
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102 # Otherwise, '*' matches any dotless string, e.g. www*
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103 pats.append(re.escape(leftmost).replace(r'\*', '[^.]*'))
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104
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105 # add the remaining fragments, ignore any wildcards
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106 for frag in remainder:
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107 pats.append(re.escape(frag))
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108
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109 pat = re.compile(r'\A' + r'\.'.join(pats) + r'\Z', re.IGNORECASE)
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110 return pat.match(hostname)
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111
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112 def match_hostname(cert, hostname):
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113 """Verify that *cert* (in decoded format as returned by
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114 SSLSocket.getpeercert()) matches the *hostname*. RFC 2818 and RFC 6125
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115 rules are followed, but IP addresses are not accepted for *hostname*.
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116
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117 CertificateError is raised on failure. On success, the function
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118 returns nothing.
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119 """
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120 if not cert:
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121 raise ValueError("empty or no certificate")
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122 dnsnames = []
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123 san = cert.get('subjectAltName', ())
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124 for key, value in san:
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125 if key == 'DNS':
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126 if _dnsname_match(value, hostname):
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127 return
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128 dnsnames.append(value)
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129 if not dnsnames:
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130 # The subject is only checked when there is no dNSName entry
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131 # in subjectAltName
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132 for sub in cert.get('subject', ()):
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133 for key, value in sub:
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134 # XXX according to RFC 2818, the most specific Common Name
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135 # must be used.
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136 if key == 'commonName':
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137 if _dnsname_match(value, hostname):
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138 return
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139 dnsnames.append(value)
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140 if len(dnsnames) > 1:
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141 raise CertificateError("hostname %r "
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142 "doesn't match either of %s"
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143 % (hostname, ', '.join(map(repr, dnsnames))))
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144 elif len(dnsnames) == 1:
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145 raise CertificateError("hostname %r "
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146 "doesn't match %r"
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147 % (hostname, dnsnames[0]))
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148 else:
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149 raise CertificateError("no appropriate commonName or "
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150 "subjectAltName fields were found")
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151
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152
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153 class VerifyingHTTPSHandler(HTTPSHandler):
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154 """Simple verifying handler: no auth, subclasses, timeouts, etc."""
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155
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156 def __init__(self, ca_bundle):
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157 self.ca_bundle = ca_bundle
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158 HTTPSHandler.__init__(self)
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159
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160 def https_open(self, req):
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161 return self.do_open(
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162 lambda host, **kw: VerifyingHTTPSConn(host, self.ca_bundle, **kw), req
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163 )
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164
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165
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166 class VerifyingHTTPSConn(HTTPSConnection):
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167 """Simple verifying connection: no auth, subclasses, timeouts, etc."""
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168 def __init__(self, host, ca_bundle, **kw):
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169 HTTPSConnection.__init__(self, host, **kw)
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170 self.ca_bundle = ca_bundle
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171
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172 def connect(self):
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173 sock = socket.create_connection(
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174 (self.host, self.port), getattr(self, 'source_address', None)
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175 )
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176
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177 # Handle the socket if a (proxy) tunnel is present
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178 if hasattr(self, '_tunnel') and getattr(self, '_tunnel_host', None):
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179 self.sock = sock
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180 self._tunnel()
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181 # http://bugs.python.org/issue7776: Python>=3.4.1 and >=2.7.7
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182 # change self.host to mean the proxy server host when tunneling is
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183 # being used. Adapt, since we are interested in the destination
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184 # host for the match_hostname() comparison.
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185 actual_host = self._tunnel_host
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186 else:
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187 actual_host = self.host
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188
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189 self.sock = ssl.wrap_socket(
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190 sock, cert_reqs=ssl.CERT_REQUIRED, ca_certs=self.ca_bundle
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191 )
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192 try:
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193 match_hostname(self.sock.getpeercert(), actual_host)
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194 except CertificateError:
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195 self.sock.shutdown(socket.SHUT_RDWR)
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196 self.sock.close()
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197 raise
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198
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199 def opener_for(ca_bundle=None):
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200 """Get a urlopen() replacement that uses ca_bundle for verification"""
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201 return urllib2.build_opener(
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202 VerifyingHTTPSHandler(ca_bundle or find_ca_bundle())
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203 ).open
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204
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205
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206 _wincerts = None
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207
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208 def get_win_certfile():
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209 global _wincerts
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210 if _wincerts is not None:
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211 return _wincerts.name
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212
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213 try:
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214 from wincertstore import CertFile
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215 except ImportError:
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216 return None
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217
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218 class MyCertFile(CertFile):
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219 def __init__(self, stores=(), certs=()):
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220 CertFile.__init__(self)
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221 for store in stores:
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222 self.addstore(store)
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223 self.addcerts(certs)
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224 atexit.register(self.close)
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225
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226 _wincerts = MyCertFile(stores=['CA', 'ROOT'])
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227 return _wincerts.name
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228
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229
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230 def find_ca_bundle():
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231 """Return an existing CA bundle path, or None"""
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232 if os.name=='nt':
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233 return get_win_certfile()
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234 else:
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235 for cert_path in cert_paths:
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236 if os.path.isfile(cert_path):
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237 return cert_path
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238 try:
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239 return pkg_resources.resource_filename('certifi', 'cacert.pem')
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240 except (ImportError, ResolutionError, ExtractionError):
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241 return None