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

planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # -*- coding: utf-8 -*-
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2
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3 """
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4 requests.auth
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5 ~~~~~~~~~~~~~
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6
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7 This module contains the authentication handlers for Requests.
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8 """
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9
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10 import os
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11 import re
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12 import time
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13 import hashlib
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14 import threading
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15
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16 from base64 import b64encode
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17
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18 from .compat import urlparse, str
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19 from .cookies import extract_cookies_to_jar
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20 from .utils import parse_dict_header, to_native_string
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21 from .status_codes import codes
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22
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23 CONTENT_TYPE_FORM_URLENCODED = 'application/x-www-form-urlencoded'
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24 CONTENT_TYPE_MULTI_PART = 'multipart/form-data'
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25
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26
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27 def _basic_auth_str(username, password):
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28 """Returns a Basic Auth string."""
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29
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30 authstr = 'Basic ' + to_native_string(
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31 b64encode(('%s:%s' % (username, password)).encode('latin1')).strip()
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32 )
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33
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34 return authstr
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35
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36
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37 class AuthBase(object):
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38 """Base class that all auth implementations derive from"""
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39
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40 def __call__(self, r):
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41 raise NotImplementedError('Auth hooks must be callable.')
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42
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43
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44 class HTTPBasicAuth(AuthBase):
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45 """Attaches HTTP Basic Authentication to the given Request object."""
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46 def __init__(self, username, password):
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47 self.username = username
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48 self.password = password
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49
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50 def __call__(self, r):
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51 r.headers['Authorization'] = _basic_auth_str(self.username, self.password)
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52 return r
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53
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54
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55 class HTTPProxyAuth(HTTPBasicAuth):
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56 """Attaches HTTP Proxy Authentication to a given Request object."""
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57 def __call__(self, r):
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58 r.headers['Proxy-Authorization'] = _basic_auth_str(self.username, self.password)
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59 return r
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60
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61
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62 class HTTPDigestAuth(AuthBase):
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63 """Attaches HTTP Digest Authentication to the given Request object."""
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64 def __init__(self, username, password):
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65 self.username = username
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66 self.password = password
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67 # Keep state in per-thread local storage
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68 self._thread_local = threading.local()
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69
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70 def init_per_thread_state(self):
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71 # Ensure state is initialized just once per-thread
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72 if not hasattr(self._thread_local, 'init'):
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73 self._thread_local.init = True
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74 self._thread_local.last_nonce = ''
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75 self._thread_local.nonce_count = 0
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76 self._thread_local.chal = {}
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77 self._thread_local.pos = None
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78 self._thread_local.num_401_calls = None
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79
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80 def build_digest_header(self, method, url):
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81
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82 realm = self._thread_local.chal['realm']
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83 nonce = self._thread_local.chal['nonce']
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84 qop = self._thread_local.chal.get('qop')
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85 algorithm = self._thread_local.chal.get('algorithm')
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86 opaque = self._thread_local.chal.get('opaque')
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87
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88 if algorithm is None:
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89 _algorithm = 'MD5'
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90 else:
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91 _algorithm = algorithm.upper()
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92 # lambdas assume digest modules are imported at the top level
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93 if _algorithm == 'MD5' or _algorithm == 'MD5-SESS':
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94 def md5_utf8(x):
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95 if isinstance(x, str):
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96 x = x.encode('utf-8')
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97 return hashlib.md5(x).hexdigest()
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98 hash_utf8 = md5_utf8
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99 elif _algorithm == 'SHA':
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100 def sha_utf8(x):
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101 if isinstance(x, str):
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102 x = x.encode('utf-8')
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103 return hashlib.sha1(x).hexdigest()
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104 hash_utf8 = sha_utf8
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105
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106 KD = lambda s, d: hash_utf8("%s:%s" % (s, d))
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107
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108 if hash_utf8 is None:
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109 return None
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110
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111 # XXX not implemented yet
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112 entdig = None
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113 p_parsed = urlparse(url)
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114 #: path is request-uri defined in RFC 2616 which should not be empty
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115 path = p_parsed.path or "/"
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116 if p_parsed.query:
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117 path += '?' + p_parsed.query
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118
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119 A1 = '%s:%s:%s' % (self.username, realm, self.password)
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120 A2 = '%s:%s' % (method, path)
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121
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122 HA1 = hash_utf8(A1)
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123 HA2 = hash_utf8(A2)
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124
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125 if nonce == self._thread_local.last_nonce:
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126 self._thread_local.nonce_count += 1
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127 else:
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128 self._thread_local.nonce_count = 1
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129 ncvalue = '%08x' % self._thread_local.nonce_count
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130 s = str(self._thread_local.nonce_count).encode('utf-8')
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131 s += nonce.encode('utf-8')
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132 s += time.ctime().encode('utf-8')
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133 s += os.urandom(8)
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134
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135 cnonce = (hashlib.sha1(s).hexdigest()[:16])
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136 if _algorithm == 'MD5-SESS':
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137 HA1 = hash_utf8('%s:%s:%s' % (HA1, nonce, cnonce))
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138
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139 if qop is None:
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140 respdig = KD(HA1, "%s:%s" % (nonce, HA2))
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141 elif qop == 'auth' or 'auth' in qop.split(','):
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142 noncebit = "%s:%s:%s:%s:%s" % (
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143 nonce, ncvalue, cnonce, 'auth', HA2
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144 )
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145 respdig = KD(HA1, noncebit)
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146 else:
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147 # XXX handle auth-int.
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148 return None
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149
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150 self._thread_local.last_nonce = nonce
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151
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152 # XXX should the partial digests be encoded too?
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153 base = 'username="%s", realm="%s", nonce="%s", uri="%s", ' \
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154 'response="%s"' % (self.username, realm, nonce, path, respdig)
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155 if opaque:
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156 base += ', opaque="%s"' % opaque
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157 if algorithm:
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158 base += ', algorithm="%s"' % algorithm
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159 if entdig:
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160 base += ', digest="%s"' % entdig
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161 if qop:
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162 base += ', qop="auth", nc=%s, cnonce="%s"' % (ncvalue, cnonce)
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163
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164 return 'Digest %s' % (base)
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165
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166 def handle_redirect(self, r, **kwargs):
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167 """Reset num_401_calls counter on redirects."""
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168 if r.is_redirect:
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169 self._thread_local.num_401_calls = 1
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170
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171 def handle_401(self, r, **kwargs):
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172 """Takes the given response and tries digest-auth, if needed."""
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173
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174 if self._thread_local.pos is not None:
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175 # Rewind the file position indicator of the body to where
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176 # it was to resend the request.
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177 r.request.body.seek(self._thread_local.pos)
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178 s_auth = r.headers.get('www-authenticate', '')
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179
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180 if 'digest' in s_auth.lower() and self._thread_local.num_401_calls < 2:
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181
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182 self._thread_local.num_401_calls += 1
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183 pat = re.compile(r'digest ', flags=re.IGNORECASE)
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184 self._thread_local.chal = parse_dict_header(pat.sub('', s_auth, count=1))
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185
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186 # Consume content and release the original connection
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187 # to allow our new request to reuse the same one.
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188 r.content
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189 r.close()
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190 prep = r.request.copy()
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191 extract_cookies_to_jar(prep._cookies, r.request, r.raw)
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192 prep.prepare_cookies(prep._cookies)
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193
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194 prep.headers['Authorization'] = self.build_digest_header(
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195 prep.method, prep.url)
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196 _r = r.connection.send(prep, **kwargs)
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197 _r.history.append(r)
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198 _r.request = prep
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199
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200 return _r
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201
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202 self._thread_local.num_401_calls = 1
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203 return r
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204
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205 def __call__(self, r):
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206 # Initialize per-thread state, if needed
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207 self.init_per_thread_state()
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208 # If we have a saved nonce, skip the 401
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209 if self._thread_local.last_nonce:
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210 r.headers['Authorization'] = self.build_digest_header(r.method, r.url)
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211 try:
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212 self._thread_local.pos = r.body.tell()
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213 except AttributeError:
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214 # In the case of HTTPDigestAuth being reused and the body of
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215 # the previous request was a file-like object, pos has the
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216 # file position of the previous body. Ensure it's set to
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217 # None.
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218 self._thread_local.pos = None
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219 r.register_hook('response', self.handle_401)
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220 r.register_hook('response', self.handle_redirect)
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221 self._thread_local.num_401_calls = 1
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222
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223 return r