66 lines
2.3 KiB
Python
66 lines
2.3 KiB
Python
|
# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
|
||
|
|
#
|
||
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
# you may not use this file except in compliance with the License.
|
||
|
|
# You may obtain a copy of the License at
|
||
|
|
#
|
||
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
#
|
||
|
|
# Unless required by applicable law or agreed to in writing, software
|
||
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
# See the License for the specific language governing permissions and
|
||
|
|
# limitations under the License.
|
||
|
|
#
|
||
|
|
|
||
|
|
# APIs for interpreting and creating protobuf packets for
|
||
|
|
# protocomm endpoint with security type protocomm_security0
|
||
|
|
|
||
|
|
from __future__ import print_function
|
||
|
|
from future.utils import tobytes
|
||
|
|
|
||
|
|
import utils
|
||
|
|
import proto
|
||
|
|
from .security import *
|
||
|
|
|
||
|
|
class Security0(Security):
|
||
|
|
def __init__(self, verbose):
|
||
|
|
# Initialize state of the security1 FSM
|
||
|
|
self.session_state = 0
|
||
|
|
self.verbose = verbose
|
||
|
|
Security.__init__(self, self.security0_session)
|
||
|
|
|
||
|
|
def security0_session(self, response_data):
|
||
|
|
# protocomm security0 FSM which interprets/forms
|
||
|
|
# protobuf packets according to present state of session
|
||
|
|
if (self.session_state == 0):
|
||
|
|
self.session_state = 1
|
||
|
|
return self.setup0_request()
|
||
|
|
if (self.session_state == 1):
|
||
|
|
self.setup0_response(response_data)
|
||
|
|
return None
|
||
|
|
|
||
|
|
def setup0_request(self):
|
||
|
|
# Form protocomm security0 request packet
|
||
|
|
setup_req = proto.session_pb2.SessionData()
|
||
|
|
setup_req.sec_ver = 0
|
||
|
|
session_cmd = proto.sec0_pb2.S0SessionCmd()
|
||
|
|
setup_req.sec0.sc.MergeFrom(session_cmd)
|
||
|
|
return setup_req.SerializeToString().decode('latin-1')
|
||
|
|
|
||
|
|
def setup0_response(self, response_data):
|
||
|
|
# Interpret protocomm security0 response packet
|
||
|
|
setup_resp = proto.session_pb2.SessionData()
|
||
|
|
setup_resp.ParseFromString(tobytes(response_data))
|
||
|
|
# Check if security scheme matches
|
||
|
|
if setup_resp.sec_ver != proto.session_pb2.SecScheme0:
|
||
|
|
print("Incorrect sec scheme")
|
||
|
|
|
||
|
|
def encrypt_data(self, data):
|
||
|
|
# Passive. No encryption when security0 used
|
||
|
|
return data
|
||
|
|
|
||
|
|
def decrypt_data(self, data):
|
||
|
|
# Passive. No encryption when security0 used
|
||
|
|
return data
|