mirror of
https://github.com/encode/django-rest-framework.git
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276 lines
9.4 KiB
Python
276 lines
9.4 KiB
Python
"""
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Provides a set of pluggable authentication policies.
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"""
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from __future__ import unicode_literals
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from django.contrib.auth import authenticate
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from django.utils.encoding import DjangoUnicodeDecodeError
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from rest_framework import exceptions, HTTP_HEADER_ENCODING
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from rest_framework.compat import CsrfViewMiddleware
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from rest_framework.authtoken.models import Token
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import base64
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from django.core.exceptions import ImproperlyConfigured
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try:
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import oauth2
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except ImportError:
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oauth2 = None
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try:
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import oauth_provider
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from oauth_provider.store import store
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except ImportError:
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oauth_provider = None
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class BaseAuthentication(object):
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"""
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All authentication classes should extend BaseAuthentication.
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"""
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def authenticate(self, request):
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"""
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Authenticate the request and return a two-tuple of (user, token).
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"""
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raise NotImplementedError(".authenticate() must be overridden.")
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def authenticate_header(self, request):
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"""
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Return a string to be used as the value of the `WWW-Authenticate`
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header in a `401 Unauthenticated` response, or `None` if the
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authentication scheme should return `403 Permission Denied` responses.
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"""
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pass
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class BasicAuthentication(BaseAuthentication):
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"""
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HTTP Basic authentication against username/password.
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"""
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www_authenticate_realm = 'api'
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def authenticate(self, request):
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"""
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Returns a `User` if a correct username and password have been supplied
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using HTTP Basic authentication. Otherwise returns `None`.
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"""
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auth = request.META.get('HTTP_AUTHORIZATION', b'')
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if type(auth) == type(''):
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# Work around django test client oddness
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auth = auth.encode(HTTP_HEADER_ENCODING)
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auth = auth.split()
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if not auth or auth[0].lower() != b'basic':
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return None
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if len(auth) != 2:
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raise exceptions.AuthenticationFailed('Invalid basic header')
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try:
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auth_parts = base64.b64decode(auth[1]).decode(HTTP_HEADER_ENCODING).partition(':')
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except (TypeError, UnicodeDecodeError):
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raise exceptions.AuthenticationFailed('Invalid basic header')
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try:
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userid, password = auth_parts[0], auth_parts[2]
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except DjangoUnicodeDecodeError:
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raise exceptions.AuthenticationFailed('Invalid basic header')
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return self.authenticate_credentials(userid, password)
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def authenticate_credentials(self, userid, password):
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"""
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Authenticate the userid and password against username and password.
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"""
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user = authenticate(username=userid, password=password)
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if user is not None and user.is_active:
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return (user, None)
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raise exceptions.AuthenticationFailed('Invalid username/password')
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def authenticate_header(self, request):
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return 'Basic realm="%s"' % self.www_authenticate_realm
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class SessionAuthentication(BaseAuthentication):
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"""
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Use Django's session framework for authentication.
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"""
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def authenticate(self, request):
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"""
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Returns a `User` if the request session currently has a logged in user.
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Otherwise returns `None`.
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"""
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# Get the underlying HttpRequest object
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http_request = request._request
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user = getattr(http_request, 'user', None)
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# Unauthenticated, CSRF validation not required
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if not user or not user.is_active:
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return None
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# Enforce CSRF validation for session based authentication.
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class CSRFCheck(CsrfViewMiddleware):
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def _reject(self, request, reason):
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# Return the failure reason instead of an HttpResponse
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return reason
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reason = CSRFCheck().process_view(http_request, None, (), {})
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if reason:
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# CSRF failed, bail with explicit error message
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raise exceptions.AuthenticationFailed('CSRF Failed: %s' % reason)
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# CSRF passed with authenticated user
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return (user, None)
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class TokenAuthentication(BaseAuthentication):
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"""
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Simple token based authentication.
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Clients should authenticate by passing the token key in the "Authorization"
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HTTP header, prepended with the string "Token ". For example:
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Authorization: Token 401f7ac837da42b97f613d789819ff93537bee6a
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"""
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model = Token
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"""
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A custom token model may be used, but must have the following properties.
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* key -- The string identifying the token
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* user -- The user to which the token belongs
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"""
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def authenticate(self, request):
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auth = request.META.get('HTTP_AUTHORIZATION', '').split()
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if not auth or auth[0].lower() != "token":
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return None
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if len(auth) != 2:
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raise exceptions.AuthenticationFailed('Invalid token header')
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return self.authenticate_credentials(auth[1])
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def authenticate_credentials(self, key):
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try:
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token = self.model.objects.get(key=key)
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except self.model.DoesNotExist:
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raise exceptions.AuthenticationFailed('Invalid token')
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if token.user.is_active:
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return (token.user, token)
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raise exceptions.AuthenticationFailed('User inactive or deleted')
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def authenticate_header(self, request):
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return 'Token'
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class OAuthAuthentication(BaseAuthentication):
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"""rest_framework OAuth authentication backend using
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django-oath-plus"""
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www_authenticate_realm = 'api'
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require_active = True
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def __init__(self, **kwargs):
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super(OAuthAuthentication, self).__init__(**kwargs)
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if oauth2 is None:
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raise ImproperlyConfigured("The 'python-oauth2' package could not be imported. It is required for use with the 'OAuthAuthentication' class.")
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if oauth_provider is None:
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raise ImproperlyConfigured("The 'django-oauth-plus' package could not be imported. It is required for use with the 'OAuthAuthentication' class.")
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def authenticate(self, request):
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"""
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:returns: two-tuple of (user, auth) if authentication succeeds, or None otherwise.
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"""
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from oauth_provider.store import store
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if self.is_valid_request(request):
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oauth_request = oauth_provider.utils.get_oauth_request(request)
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if not self.check_nonce(request, oauth_request):
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raise exceptions.AuthenticationFailed("Nonce check failed")
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try:
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consumer = store.get_consumer(request, oauth_request,
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oauth_request.get_parameter('oauth_consumer_key'))
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except oauth_provider.store.InvalidConsumerError, e:
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raise exceptions.AuthenticationFailed(e)
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if consumer.status != oauth_provider.consts.ACCEPTED:
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raise exceptions.AuthenticationFailed('Invalid consumer key status: %s' % consumer.get_status_display())
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try:
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token = store.get_access_token(request, oauth_request,
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consumer, oauth_request.get_parameter('oauth_token'))
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except oauth_provider.store.InvalidTokenError:
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raise exceptions.AuthenticationFailed(
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'Invalid access token: %s' % oauth_request.get_parameter('oauth_token'))
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try:
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self.validate_token(request, consumer, token)
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except oauth2.Error, e:
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print "got e"
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raise exceptions.AuthenticationFailed(e.message)
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if not self.check_active(token.user):
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raise exceptions.AuthenticationFailed('User not active: %s' % token.user.username)
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if consumer and token:
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request.user = token.user
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return (request.user, None)
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raise exceptions.AuthenticationFailed(
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'You are not allowed to access this resource.')
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return None
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def authenticate_header(self, request):
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return 'OAuth realm="%s"' % self.www_authenticate_realm
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def is_in(self, params):
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"""
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Checks to ensure that all the OAuth parameter names are in the
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provided ``params``.
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"""
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from oauth_provider.consts import OAUTH_PARAMETERS_NAMES
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for param_name in OAUTH_PARAMETERS_NAMES:
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if param_name not in params:
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return False
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return True
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def is_valid_request(self, request):
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"""
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Checks whether the required parameters are either in the HTTP
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``Authorization`` header sent by some clients (the preferred method
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according to OAuth spec) or fall back to ``GET/POST``.
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"""
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auth_params = request.META.get("HTTP_AUTHORIZATION", [])
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return self.is_in(auth_params) or self.is_in(request.REQUEST)
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def validate_token(self, request, consumer, token):
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oauth_server, oauth_request = oauth_provider.utils.initialize_server_request(request)
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return oauth_server.verify_request(oauth_request, consumer, token)
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def check_active(self, user):
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"""
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Ensures the user has an active account.
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Optimized for the ``django.contrib.auth.models.User`` case.
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"""
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if not self.require_active:
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# Ignore & move on.
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return True
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return user.is_active
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def check_nonce(self, request, oauth_request):
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"""Checks nonce of request"""
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return store.check_nonce(request, oauth_request, oauth_request['oauth_nonce'])
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