223 lines
7.4 KiB
Python
223 lines
7.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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requests.auth
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~~~~~~~~~~~~~
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This module contains the authentication handlers for Requests.
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"""
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import os
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import re
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import time
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import hashlib
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import threading
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from base64 import b64encode
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from .compat import urlparse, str
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from .cookies import extract_cookies_to_jar
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from .utils import parse_dict_header, to_native_string
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from .status_codes import codes
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CONTENT_TYPE_FORM_URLENCODED = 'application/x-www-form-urlencoded'
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CONTENT_TYPE_MULTI_PART = 'multipart/form-data'
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def _basic_auth_str(username, password):
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"""Returns a Basic Auth string."""
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authstr = 'Basic ' + to_native_string(
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b64encode(('%s:%s' % (username, password)).encode('latin1')).strip()
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)
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return authstr
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class AuthBase(object):
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"""Base class that all auth implementations derive from"""
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def __call__(self, r):
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raise NotImplementedError('Auth hooks must be callable.')
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class HTTPBasicAuth(AuthBase):
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"""Attaches HTTP Basic Authentication to the given Request object."""
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def __init__(self, username, password):
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self.username = username
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self.password = password
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def __call__(self, r):
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r.headers['Authorization'] = _basic_auth_str(self.username, self.password)
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return r
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class HTTPProxyAuth(HTTPBasicAuth):
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"""Attaches HTTP Proxy Authentication to a given Request object."""
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def __call__(self, r):
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r.headers['Proxy-Authorization'] = _basic_auth_str(self.username, self.password)
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return r
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class HTTPDigestAuth(AuthBase):
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"""Attaches HTTP Digest Authentication to the given Request object."""
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def __init__(self, username, password):
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self.username = username
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self.password = password
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# Keep state in per-thread local storage
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self._thread_local = threading.local()
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def init_per_thread_state(self):
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# Ensure state is initialized just once per-thread
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if not hasattr(self._thread_local, 'init'):
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self._thread_local.init = True
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self._thread_local.last_nonce = ''
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self._thread_local.nonce_count = 0
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self._thread_local.chal = {}
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self._thread_local.pos = None
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self._thread_local.num_401_calls = None
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def build_digest_header(self, method, url):
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realm = self._thread_local.chal['realm']
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nonce = self._thread_local.chal['nonce']
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qop = self._thread_local.chal.get('qop')
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algorithm = self._thread_local.chal.get('algorithm')
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opaque = self._thread_local.chal.get('opaque')
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if algorithm is None:
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_algorithm = 'MD5'
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else:
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_algorithm = algorithm.upper()
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# lambdas assume digest modules are imported at the top level
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if _algorithm == 'MD5' or _algorithm == 'MD5-SESS':
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def md5_utf8(x):
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if isinstance(x, str):
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x = x.encode('utf-8')
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return hashlib.md5(x).hexdigest()
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hash_utf8 = md5_utf8
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elif _algorithm == 'SHA':
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def sha_utf8(x):
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if isinstance(x, str):
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x = x.encode('utf-8')
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return hashlib.sha1(x).hexdigest()
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hash_utf8 = sha_utf8
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KD = lambda s, d: hash_utf8("%s:%s" % (s, d))
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if hash_utf8 is None:
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return None
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# XXX not implemented yet
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entdig = None
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p_parsed = urlparse(url)
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#: path is request-uri defined in RFC 2616 which should not be empty
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path = p_parsed.path or "/"
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if p_parsed.query:
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path += '?' + p_parsed.query
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A1 = '%s:%s:%s' % (self.username, realm, self.password)
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A2 = '%s:%s' % (method, path)
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HA1 = hash_utf8(A1)
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HA2 = hash_utf8(A2)
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if nonce == self._thread_local.last_nonce:
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self._thread_local.nonce_count += 1
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else:
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self._thread_local.nonce_count = 1
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ncvalue = '%08x' % self._thread_local.nonce_count
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s = str(self._thread_local.nonce_count).encode('utf-8')
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s += nonce.encode('utf-8')
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s += time.ctime().encode('utf-8')
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s += os.urandom(8)
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cnonce = (hashlib.sha1(s).hexdigest()[:16])
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if _algorithm == 'MD5-SESS':
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HA1 = hash_utf8('%s:%s:%s' % (HA1, nonce, cnonce))
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if not qop:
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respdig = KD(HA1, "%s:%s" % (nonce, HA2))
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elif qop == 'auth' or 'auth' in qop.split(','):
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noncebit = "%s:%s:%s:%s:%s" % (
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nonce, ncvalue, cnonce, 'auth', HA2
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)
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respdig = KD(HA1, noncebit)
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else:
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# XXX handle auth-int.
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return None
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self._thread_local.last_nonce = nonce
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# XXX should the partial digests be encoded too?
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base = 'username="%s", realm="%s", nonce="%s", uri="%s", ' \
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'response="%s"' % (self.username, realm, nonce, path, respdig)
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if opaque:
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base += ', opaque="%s"' % opaque
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if algorithm:
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base += ', algorithm="%s"' % algorithm
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if entdig:
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base += ', digest="%s"' % entdig
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if qop:
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base += ', qop="auth", nc=%s, cnonce="%s"' % (ncvalue, cnonce)
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return 'Digest %s' % (base)
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def handle_redirect(self, r, **kwargs):
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"""Reset num_401_calls counter on redirects."""
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if r.is_redirect:
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self._thread_local.num_401_calls = 1
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def handle_401(self, r, **kwargs):
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"""Takes the given response and tries digest-auth, if needed."""
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if self._thread_local.pos is not None:
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# Rewind the file position indicator of the body to where
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# it was to resend the request.
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r.request.body.seek(self._thread_local.pos)
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s_auth = r.headers.get('www-authenticate', '')
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if 'digest' in s_auth.lower() and self._thread_local.num_401_calls < 2:
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self._thread_local.num_401_calls += 1
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pat = re.compile(r'digest ', flags=re.IGNORECASE)
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self._thread_local.chal = parse_dict_header(pat.sub('', s_auth, count=1))
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# Consume content and release the original connection
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# to allow our new request to reuse the same one.
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r.content
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r.close()
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prep = r.request.copy()
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extract_cookies_to_jar(prep._cookies, r.request, r.raw)
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prep.prepare_cookies(prep._cookies)
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prep.headers['Authorization'] = self.build_digest_header(
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prep.method, prep.url)
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_r = r.connection.send(prep, **kwargs)
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_r.history.append(r)
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_r.request = prep
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return _r
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self._thread_local.num_401_calls = 1
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return r
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def __call__(self, r):
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# Initialize per-thread state, if needed
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self.init_per_thread_state()
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# If we have a saved nonce, skip the 401
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if self._thread_local.last_nonce:
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r.headers['Authorization'] = self.build_digest_header(r.method, r.url)
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try:
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self._thread_local.pos = r.body.tell()
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except AttributeError:
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# In the case of HTTPDigestAuth being reused and the body of
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# the previous request was a file-like object, pos has the
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# file position of the previous body. Ensure it's set to
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# None.
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self._thread_local.pos = None
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r.register_hook('response', self.handle_401)
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r.register_hook('response', self.handle_redirect)
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self._thread_local.num_401_calls = 1
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return r
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