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Edit File : auth.py \| Size : 9.50 KB
# -- coding: utf-8 -- """ requests.auth ~~~~~~~~~~~~~ This module contains the authentication handlers for Requests. """ import os import re import time import hashlib import threading import warnings from base64 import b64encode from .compat import urlparse, str, basestring from .cookies import extract_cookies_to_jar from ._internal_utils import to_native_string from .utils import parse_dict_header CONTENT_TYPE_FORM_URLENCODED = 'application/x-www-form-urlencoded' CONTENT_TYPE_MULTI_PART = 'multipart/form-data' def _basic_auth_str(username, password): """Returns a Basic Auth string.""" # "I want us to put a big-ol' comment on top of it that # says that this behaviour is dumb but we need to preserve # it because people are relying on it." # - Lukasa # # These are here solely to maintain backwards compatibility # for things like ints. This will be removed in 3.0.0. if not isinstance(username, basestring): warnings.warn( "Non-string usernames will no longer be supported in Requests " "3.0.0. Please convert the object you've passed in ({0!r}) to " "a string or bytes object in the near future to avoid " "problems.".format(username), category=DeprecationWarning, ) username = str(username) if not isinstance(password, basestring): warnings.warn( "Non-string passwords will no longer be supported in Requests " "3.0.0. Please convert the object you've passed in ({0!r}) to " "a string or bytes object in the near future to avoid " "problems.".format(password), category=DeprecationWarning, ) password = str(password) # -- End Removal -- if isinstance(username, str): username = username.encode('latin1') if isinstance(password, str): password = password.encode('latin1') authstr = 'Basic ' + to_native_string( b64encode(b':'.join((username, password))).strip() ) return authstr class AuthBase(object): """Base class that all auth implementations derive from""" def __call__(self, r): raise NotImplementedError('Auth hooks must be callable.') class HTTPBasicAuth(AuthBase): """Attaches HTTP Basic Authentication to the given Request object.""" def __init__(self, username, password): self.username = username self.password = password def __eq__(self, other): return all([ self.username == getattr(other, 'username', None), self.password == getattr(other, 'password', None) ]) def __ne__(self, other): return not self == other def __call__(self, r): r.headers['Authorization'] = _basic_auth_str(self.username, self.password) return r class HTTPProxyAuth(HTTPBasicAuth): """Attaches HTTP Proxy Authentication to a given Request object.""" def __call__(self, r): r.headers['Proxy-Authorization'] = _basic_auth_str(self.username, self.password) return r class HTTPDigestAuth(AuthBase): """Attaches HTTP Digest Authentication to the given Request object.""" def __init__(self, username, password): self.username = username self.password = password # Keep state in per-thread local storage self._thread_local = threading.local() def init_per_thread_state(self): # Ensure state is initialized just once per-thread if not hasattr(self._thread_local, 'init'): self._thread_local.init = True self._thread_local.last_nonce = '' self._thread_local.nonce_count = 0 self._thread_local.chal = {} self._thread_local.pos = None self._thread_local.num_401_calls = None def build_digest_header(self, method, url): """ :rtype: str """ realm = self._thread_local.chal['realm'] nonce = self._thread_local.chal['nonce'] qop = self._thread_local.chal.get('qop') algorithm = self._thread_local.chal.get('algorithm') opaque = self._thread_local.chal.get('opaque') hash_utf8 = None if algorithm is None: _algorithm = 'MD5' else: _algorithm = algorithm.upper() # lambdas assume digest modules are imported at the top level if _algorithm == 'MD5' or _algorithm == 'MD5-SESS': def md5_utf8(x): if isinstance(x, str): x = x.encode('utf-8') return hashlib.md5(x).hexdigest() hash_utf8 = md5_utf8 elif _algorithm == 'SHA': def sha_utf8(x): if isinstance(x, str): x = x.encode('utf-8') return hashlib.sha1(x).hexdigest() hash_utf8 = sha_utf8 KD = lambda s, d: hash_utf8("%s:%s" % (s, d)) if hash_utf8 is None: return None # XXX not implemented yet entdig = None p_parsed = urlparse(url) #: path is request-uri defined in RFC 2616 which should not be empty path = p_parsed.path or "/" if p_parsed.query: path += '?' + p_parsed.query A1 = '%s:%s:%s' % (self.username, realm, self.password) A2 = '%s:%s' % (method, path) HA1 = hash_utf8(A1) HA2 = hash_utf8(A2) if nonce == self._thread_local.last_nonce: self._thread_local.nonce_count += 1 else: self._thread_local.nonce_count = 1 ncvalue = '%08x' % self._thread_local.nonce_count s = str(self._thread_local.nonce_count).encode('utf-8') s += nonce.encode('utf-8') s += time.ctime().encode('utf-8') s += os.urandom(8) cnonce = (hashlib.sha1(s).hexdigest()[:16]) if _algorithm == 'MD5-SESS': HA1 = hash_utf8('%s:%s:%s' % (HA1, nonce, cnonce)) if not qop: respdig = KD(HA1, "%s:%s" % (nonce, HA2)) elif qop == 'auth' or 'auth' in qop.split(','): noncebit = "%s:%s:%s:%s:%s" % ( nonce, ncvalue, cnonce, 'auth', HA2 ) respdig = KD(HA1, noncebit) else: # XXX handle auth-int. return None self._thread_local.last_nonce = nonce # XXX should the partial digests be encoded too? base = 'username="%s", realm="%s", nonce="%s", uri="%s", ' \ 'response="%s"' % (self.username, realm, nonce, path, respdig) if opaque: base += ', opaque="%s"' % opaque if algorithm: base += ', algorithm="%s"' % algorithm if entdig: base += ', digest="%s"' % entdig if qop: base += ', qop="auth", nc=%s, cnonce="%s"' % (ncvalue, cnonce) return 'Digest %s' % (base) def handle_redirect(self, r, kwargs): """Reset num_401_calls counter on redirects.""" if r.is_redirect: self._thread_local.num_401_calls = 1 def handle_401(self, r, kwargs): """ Takes the given response and tries digest-auth, if needed. :rtype: requests.Response """ # If response is not 4xx, do not auth # See https://github.com/requests/requests/issues/3772 if not 400 <= r.status_code < 500: self._thread_local.num_401_calls = 1 return r if self._thread_local.pos is not None: # Rewind the file position indicator of the body to where # it was to resend the request. r.request.body.seek(self._thread_local.pos) s_auth = r.headers.get('www-authenticate', '') if 'digest' in s_auth.lower() and self._thread_local.num_401_calls < 2: self._thread_local.num_401_calls += 1 pat = re.compile(r'digest ', flags=re.IGNORECASE) self._thread_local.chal = parse_dict_header(pat.sub('', s_auth, count=1)) # Consume content and release the original connection # to allow our new request to reuse the same one. r.content r.close() prep = r.request.copy() extract_cookies_to_jar(prep._cookies, r.request, r.raw) prep.prepare_cookies(prep._cookies) prep.headers['Authorization'] = self.build_digest_header( prep.method, prep.url) _r = r.connection.send(prep, **kwargs) _r.history.append(r) _r.request = prep return _r self._thread_local.num_401_calls = 1 return r def __call__(self, r): # Initialize per-thread state, if needed self.init_per_thread_state() # If we have a saved nonce, skip the 401 if self._thread_local.last_nonce: r.headers['Authorization'] = self.build_digest_header(r.method, r.url) try: self._thread_local.pos = r.body.tell() except AttributeError: # In the case of HTTPDigestAuth being reused and the body of # the previous request was a file-like object, pos has the # file position of the previous body. Ensure it's set to # None. self._thread_local.pos = None r.register_hook('response', self.handle_401) r.register_hook('response', self.handle_redirect) self._thread_local.num_401_calls = 1 return r def __eq__(self, other): return all([ self.username == getattr(other, 'username', None), self.password == getattr(other, 'password', None) ]) def __ne__(self, other): return not self == other Back

Edit File : auth.py | Size : 9.50 KB

# -*- coding: utf-8 -*-

"""
requests.auth
~~~~~~~~~~~~~

This module contains the authentication handlers for Requests.
"""

import os
import re
import time
import hashlib
import threading
import warnings

from base64 import b64encode

from .compat import urlparse, str, basestring
from .cookies import extract_cookies_to_jar
from ._internal_utils import to_native_string
from .utils import parse_dict_header

CONTENT_TYPE_FORM_URLENCODED = 'application/x-www-form-urlencoded'
CONTENT_TYPE_MULTI_PART = 'multipart/form-data'

def _basic_auth_str(username, password):
    """Returns a Basic Auth string."""

# "I want us to put a big-ol' comment on top of it that
    # says that this behaviour is dumb but we need to preserve
    # it because people are relying on it."
    #    - Lukasa
    #
    # These are here solely to maintain backwards compatibility
    # for things like ints. This will be removed in 3.0.0.
    if not isinstance(username, basestring):
        warnings.warn(
            "Non-string usernames will no longer be supported in Requests "
            "3.0.0. Please convert the object you've passed in ({0!r}) to "
            "a string or bytes object in the near future to avoid "
            "problems.".format(username),
            category=DeprecationWarning,
        )
        username = str(username)

if not isinstance(password, basestring):
        warnings.warn(
            "Non-string passwords will no longer be supported in Requests "
            "3.0.0. Please convert the object you've passed in ({0!r}) to "
            "a string or bytes object in the near future to avoid "
            "problems.".format(password),
            category=DeprecationWarning,
        )
        password = str(password)
    # -- End Removal --

if isinstance(username, str):
        username = username.encode('latin1')

if isinstance(password, str):
        password = password.encode('latin1')

authstr = 'Basic ' + to_native_string(
        b64encode(b':'.join((username, password))).strip()
    )

return authstr

class AuthBase(object):
    """Base class that all auth implementations derive from"""

def __call__(self, r):
        raise NotImplementedError('Auth hooks must be callable.')

class HTTPBasicAuth(AuthBase):
    """Attaches HTTP Basic Authentication to the given Request object."""

def __init__(self, username, password):
        self.username = username
        self.password = password

def __eq__(self, other):
        return all([
            self.username == getattr(other, 'username', None),
            self.password == getattr(other, 'password', None)
        ])

def __ne__(self, other):
        return not self == other

def __call__(self, r):
        r.headers['Authorization'] = _basic_auth_str(self.username, self.password)
        return r

class HTTPProxyAuth(HTTPBasicAuth):
    """Attaches HTTP Proxy Authentication to a given Request object."""

def __call__(self, r):
        r.headers['Proxy-Authorization'] = _basic_auth_str(self.username, self.password)
        return r

class HTTPDigestAuth(AuthBase):
    """Attaches HTTP Digest Authentication to the given Request object."""

def __init__(self, username, password):
        self.username = username
        self.password = password
        # Keep state in per-thread local storage
        self._thread_local = threading.local()

def init_per_thread_state(self):
        # Ensure state is initialized just once per-thread
        if not hasattr(self._thread_local, 'init'):
            self._thread_local.init = True
            self._thread_local.last_nonce = ''
            self._thread_local.nonce_count = 0
            self._thread_local.chal = {}
            self._thread_local.pos = None
            self._thread_local.num_401_calls = None

def build_digest_header(self, method, url):
        """
        :rtype: str
        """

realm = self._thread_local.chal['realm']
        nonce = self._thread_local.chal['nonce']
        qop = self._thread_local.chal.get('qop')
        algorithm = self._thread_local.chal.get('algorithm')
        opaque = self._thread_local.chal.get('opaque')
        hash_utf8 = None

if algorithm is None:
            _algorithm = 'MD5'
        else:
            _algorithm = algorithm.upper()
        # lambdas assume digest modules are imported at the top level
        if _algorithm == 'MD5' or _algorithm == 'MD5-SESS':
            def md5_utf8(x):
                if isinstance(x, str):
                    x = x.encode('utf-8')
                return hashlib.md5(x).hexdigest()
            hash_utf8 = md5_utf8
        elif _algorithm == 'SHA':
            def sha_utf8(x):
                if isinstance(x, str):
                    x = x.encode('utf-8')
                return hashlib.sha1(x).hexdigest()
            hash_utf8 = sha_utf8

KD = lambda s, d: hash_utf8("%s:%s" % (s, d))

if hash_utf8 is None:
            return None

# XXX not implemented yet
        entdig = None
        p_parsed = urlparse(url)
        #: path is request-uri defined in RFC 2616 which should not be empty
        path = p_parsed.path or "/"
        if p_parsed.query:
            path += '?' + p_parsed.query

A1 = '%s:%s:%s' % (self.username, realm, self.password)
        A2 = '%s:%s' % (method, path)

HA1 = hash_utf8(A1)
        HA2 = hash_utf8(A2)

if nonce == self._thread_local.last_nonce:
            self._thread_local.nonce_count += 1
        else:
            self._thread_local.nonce_count = 1
        ncvalue = '%08x' % self._thread_local.nonce_count
        s = str(self._thread_local.nonce_count).encode('utf-8')
        s += nonce.encode('utf-8')
        s += time.ctime().encode('utf-8')
        s += os.urandom(8)

cnonce = (hashlib.sha1(s).hexdigest()[:16])
        if _algorithm == 'MD5-SESS':
            HA1 = hash_utf8('%s:%s:%s' % (HA1, nonce, cnonce))

if not qop:
            respdig = KD(HA1, "%s:%s" % (nonce, HA2))
        elif qop == 'auth' or 'auth' in qop.split(','):
            noncebit = "%s:%s:%s:%s:%s" % (
                nonce, ncvalue, cnonce, 'auth', HA2
            )
            respdig = KD(HA1, noncebit)
        else:
            # XXX handle auth-int.
            return None

self._thread_local.last_nonce = nonce

# XXX should the partial digests be encoded too?
        base = 'username="%s", realm="%s", nonce="%s", uri="%s", ' \
               'response="%s"' % (self.username, realm, nonce, path, respdig)
        if opaque:
            base += ', opaque="%s"' % opaque
        if algorithm:
            base += ', algorithm="%s"' % algorithm
        if entdig:
            base += ', digest="%s"' % entdig
        if qop:
            base += ', qop="auth", nc=%s, cnonce="%s"' % (ncvalue, cnonce)

return 'Digest %s' % (base)

def handle_redirect(self, r, **kwargs):
        """Reset num_401_calls counter on redirects."""
        if r.is_redirect:
            self._thread_local.num_401_calls = 1

def handle_401(self, r, **kwargs):
        """
        Takes the given response and tries digest-auth, if needed.

:rtype: requests.Response
        """

# If response is not 4xx, do not auth
        # See https://github.com/requests/requests/issues/3772
        if not 400 <= r.status_code < 500:
            self._thread_local.num_401_calls = 1
            return r

if self._thread_local.pos is not None:
            # Rewind the file position indicator of the body to where
            # it was to resend the request.
            r.request.body.seek(self._thread_local.pos)
        s_auth = r.headers.get('www-authenticate', '')

if 'digest' in s_auth.lower() and self._thread_local.num_401_calls < 2:

self._thread_local.num_401_calls += 1
            pat = re.compile(r'digest ', flags=re.IGNORECASE)
            self._thread_local.chal = parse_dict_header(pat.sub('', s_auth, count=1))

# Consume content and release the original connection
            # to allow our new request to reuse the same one.
            r.content
            r.close()
            prep = r.request.copy()
            extract_cookies_to_jar(prep._cookies, r.request, r.raw)
            prep.prepare_cookies(prep._cookies)

prep.headers['Authorization'] = self.build_digest_header(
                prep.method, prep.url)
            _r = r.connection.send(prep, **kwargs)
            _r.history.append(r)
            _r.request = prep

return _r

self._thread_local.num_401_calls = 1
        return r

def __call__(self, r):
        # Initialize per-thread state, if needed
        self.init_per_thread_state()
        # If we have a saved nonce, skip the 401
        if self._thread_local.last_nonce:
            r.headers['Authorization'] = self.build_digest_header(r.method, r.url)
        try:
            self._thread_local.pos = r.body.tell()
        except AttributeError:
            # In the case of HTTPDigestAuth being reused and the body of
            # the previous request was a file-like object, pos has the
            # file position of the previous body. Ensure it's set to
            # None.
            self._thread_local.pos = None
        r.register_hook('response', self.handle_401)
        r.register_hook('response', self.handle_redirect)
        self._thread_local.num_401_calls = 1

return r

def __eq__(self, other):
        return all([
            self.username == getattr(other, 'username', None),
            self.password == getattr(other, 'password', None)
        ])

def __ne__(self, other):
        return not self == other

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