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# -*- coding: utf-8 -*-
from __future__ import absolute_import, unicode_literals
"""
oauthlib.oauth1.rfc5849
~~~~~~~~~~~~~~
This module is an implementation of various logic needed
for signing and checking OAuth 1.0 RFC 5849 requests.
"""
from oauthlib.common import log
from .base import BaseEndpoint
from .. import errors
class ResourceEndpoint(BaseEndpoint):
def validate_protected_resource_request(self, uri, http_method='GET',
body=None, headers=None, valid_realms=None):
try:
request = self._create_request(uri, http_method, body, headers)
except errors.OAuth1Error:
return False, None
try:
self._check_transport_security(request)
self._check_mandatory_parameters(request)
except errors.OAuth1Error:
return False, request
if not request.resource_owner_key:
return False, request
if not self.request_validator.check_access_token(
request.resource_owner_key):
return False, request
if not self.request_validator.validate_timestamp_and_nonce(
request.client_key, request.timestamp, request.nonce, request,
request_token=request.resource_owner_key):
return False, request
# The server SHOULD return a 401 (Unauthorized) status code when
# receiving a request with invalid client credentials.
# Note: This is postponed in order to avoid timing attacks, instead
# a dummy client is assigned and used to maintain near constant
# time request verification.
#
# Note that early exit would enable client enumeration
valid_client = self.request_validator.validate_client_key(
request.client_key, request)
if not valid_client:
request.client_key = self.request_validator.dummy_client
# The server SHOULD return a 401 (Unauthorized) status code when
# receiving a request with invalid or expired token.
# Note: This is postponed in order to avoid timing attacks, instead
# a dummy token is assigned and used to maintain near constant
# time request verification.
#
# Note that early exit would enable resource owner enumeration
valid_resource_owner = self.request_validator.validate_access_token(
request.client_key, request.resource_owner_key, request)
if not valid_resource_owner:
request.resource_owner_key = self.request_validator.dummy_access_token
# Note that `realm`_ is only used in authorization headers and how
# it should be interepreted is not included in the OAuth spec.
# However they could be seen as a scope or realm to which the
# client has access and as such every client should be checked
# to ensure it is authorized access to that scope or realm.
# .. _`realm`: http://tools.ietf.org/html/rfc2617#section-1.2
#
# Note that early exit would enable client realm access enumeration.
#
# The require_realm indicates this is the first step in the OAuth
# workflow where a client requests access to a specific realm.
# This first step (obtaining request token) need not require a realm
# and can then be identified by checking the require_resource_owner
# flag and abscence of realm.
#
# Clients obtaining an access token will not supply a realm and it will
# not be checked. Instead the previously requested realm should be
# transferred from the request token to the access token.
#
# Access to protected resources will always validate the realm but note
# that the realm is now tied to the access token and not provided by
# the client.
valid_realm = self.request_validator.validate_realm(request.client_key,
request.resource_owner_key, request, uri=request.uri,
valid_realms=valid_realms)
valid_signature = self._check_signature(request)
# We delay checking validity until the very end, using dummy values for
# calculations and fetching secrets/keys to ensure the flow of every
# request remains almost identical regardless of whether valid values
# have been supplied. This ensures near constant time execution and
# prevents malicious users from guessing sensitive information
v = all((valid_client, valid_resource_owner, valid_realm,
valid_signature))
if not v:
log.info("[Failure] request verification failed.")
log.info("Valid client: %s", valid_client)
log.info("Valid token: %s", valid_resource_owner)
log.info("Valid realm: %s", valid_realm)
log.info("Valid signature: %s", valid_signature)
return v, request
|
