63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
#!/usr/bin/env python
|
|
#
|
|
# Copyright (C) 2014 Google Inc.
|
|
#
|
|
# This file is part of YouCompleteMe.
|
|
#
|
|
# YouCompleteMe is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# YouCompleteMe is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with YouCompleteMe. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
import logging
|
|
import httplib
|
|
from bottle import request, response, abort
|
|
from ycm import utils
|
|
|
|
_HMAC_HEADER = 'x-ycm-hmac'
|
|
|
|
# This class implements the Bottle plugin API:
|
|
# http://bottlepy.org/docs/dev/plugindev.html
|
|
#
|
|
# We want to ensure that every request coming in has a valid HMAC set in the
|
|
# x-ycm-hmac header and that every response coming out sets such a valid header.
|
|
# This is to prevent security issues with possible remote code execution.
|
|
class HmacPlugin( object ):
|
|
name = 'hmac'
|
|
api = 2
|
|
|
|
|
|
def __init__( self, hmac_secret ):
|
|
self._hmac_secret = hmac_secret
|
|
self._logger = logging.getLogger( __name__ )
|
|
|
|
|
|
def __call__( self, callback ):
|
|
def wrapper( *args, **kwargs ):
|
|
body = request.body.read()
|
|
if not RequestAuthenticated( body, self._hmac_secret ):
|
|
self._logger.info( 'Dropping request with bad HMAC.' )
|
|
abort( httplib.UNAUTHORIZED, 'Unauthorized, received bad HMAC.')
|
|
return
|
|
body = callback( *args, **kwargs )
|
|
SetHmacHeader( body, self._hmac_secret )
|
|
return body
|
|
return wrapper
|
|
|
|
|
|
def RequestAuthenticated( body, hmac_secret ):
|
|
return utils.ContentHexHmacValid( body,
|
|
request.headers[ _HMAC_HEADER ],
|
|
hmac_secret )
|
|
|
|
def SetHmacHeader( body, hmac_secret ):
|
|
response.headers[ _HMAC_HEADER ] = utils.CreateHexHmac( body, hmac_secret )
|