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accessoryserver.py
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#
# Copyright 2018 Joachim Lusiardi
#
# 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.
#
import binascii
from http.server import BaseHTTPRequestHandler, HTTPServer
import io
import json
from json.decoder import JSONDecodeError
import logging
import select
import socket
from socketserver import ThreadingMixIn
import sys
import threading
from cryptography import exceptions as cryptography_exceptions
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import ed25519, x25519
from zeroconf import ServiceInfo, Zeroconf
from aiohomekit.crypto import hkdf_derive
from aiohomekit.crypto.chacha20poly1305 import (
chacha20_aead_decrypt,
chacha20_aead_encrypt,
)
from aiohomekit.crypto.srp import SrpServer
from aiohomekit.exceptions import (
CharacteristicPermissionError,
ConfigLoadingError,
ConfigSavingError,
ConfigurationError,
DisconnectedControllerError,
FormatError,
)
from aiohomekit.http import HttpStatusCodes
from aiohomekit.model import Accessories, Categories
from aiohomekit.model.characteristics import CharacteristicsTypes
from aiohomekit.protocol import TLV
from aiohomekit.protocol.statuscodes import HapStatusCodes
class AccessoryServer(ThreadingMixIn, HTTPServer):
"""
This server makes accessories accessible via the HomeKit protocol.
"""
def __init__(self, config_file, logger=sys.stderr):
"""
Create a new server that acts like a homekit accessory. The config file is loaded and checked.
:param config_file: the file that contains the configuration data. Must be a string representing an absolute
path to the file
:param logger: this can be None to disable logging, sys.stderr to use the default behaviour of the python
implementation or an instance of logging.Logger to use this.
:raises HomeKitConfigurationException: if the config file is malformed. Reason will be in the message.
"""
if logger is None or logger == sys.stderr or isinstance(logger, logging.Logger):
self.logger = logger
else:
raise ConfigurationError("Invalid logger given.")
self.data = AccessoryServerData(config_file)
self.data.increase_configuration_number()
self.sessions = {}
self.zeroconf = Zeroconf()
self.mdns_type = "_hap._tcp.local."
self.mdns_name = self.data.name + "._hap._tcp.local."
self.identify_callback = None
self.zeroconf_info = None
self.accessories = Accessories()
HTTPServer.__init__(
self, (self.data.ip, self.data.port), AccessoryRequestHandler
)
def write_event(self, characteristics, source=None):
dead_sessions = []
for session_id, session in self.sessions.items():
if source and session_id == source:
continue
try:
session["handler"].write_event(characteristics)
except DisconnectedControllerError:
dead_sessions.append(session_id)
for session_id in dead_sessions:
del self.sessions[session_id]
def add_accessory(self, accessory):
self.accessories.add_accessory(accessory)
def set_identify_callback(self, func):
"""
Sets the callback function for this accessory server. This will NOT be applied to all accessories registered
with. This function will be called on unpaired calls to identify.
:param func: a function without any parameters and without return type.
"""
self.identify_callback = func
def publish_device(self):
desc = {
"md": str(self.data.name), # model name of accessory
# category identifier (page 254, 2 means bridge), must be a String
"ci": str(Categories[self.data.category]),
"pv": "1.0", # protocol version
"c#": str(self.data.configuration_number),
# configuration (consecutive number, 1 or greater, must be changed on every configuration change)
"id": self.data.accessory_pairing_id_bytes, # id MUST look like Mac Address
"ff": "0", # feature flags (Table 5-8, page 69)
"s#": "1", # must be 1
"sf": "1", # status flag, lowest bit encodes pairing status, 1 means unpaired
}
if self.data.is_paired:
desc["sf"] = "0"
self.zeroconf_info = ServiceInfo(
self.mdns_type,
self.mdns_name,
addresses=[socket.inet_aton(self.data.ip)],
port=self.data.port,
properties=desc,
)
self.zeroconf.unregister_service(self.zeroconf_info)
self.zeroconf.register_service(self.zeroconf_info, allow_name_change=True)
def unpublish_device(self):
if self.zeroconf_info:
self.zeroconf.unregister_service(self.zeroconf_info)
def shutdown(self):
# tell all handlers to close the connection
for session in self.sessions:
self.sessions[session]["handler"].close_connection = True
self.socket.close()
HTTPServer.shutdown(self)
class AccessoryServerData:
"""
This class is used to take care of the servers persistence to be able to manage restarts,
"""
def __init__(self, data_file):
self.data_file = data_file
try:
with open(data_file, "r") as input_file:
self.data = json.load(input_file)
except PermissionError:
raise ConfigLoadingError(
'Could not open "{f}" due to missing permissions'.format(f=input_file)
)
except JSONDecodeError:
raise ConfigLoadingError(
'Cannot parse "{f}" as JSON file'.format(f=input_file)
)
except FileNotFoundError:
raise ConfigLoadingError(
'Could not open "{f}" because it does not exist'.format(f=input_file)
)
self.check()
# set some default values
if "peers" not in self.data:
self.data["peers"] = {}
if "unsuccessful_tries" not in self.data:
self.data["unsuccessful_tries"] = 0
def _save_data(self):
try:
with open(self.data_file, "w") as output_file:
json.dump(self.data, output_file, indent=2, sort_keys=True)
except PermissionError:
raise ConfigSavingError(
'Could not write "{f}" due to missing permissions'.format(
f=self.data_file
)
)
except FileNotFoundError:
raise ConfigSavingError(
'Could not write "{f}" because it (or the folder) does not exist'.format(
f=self.data_file
)
)
@property
def ip(self) -> str:
return self.data["host_ip"]
@property
def port(self) -> int:
return self.data["host_port"]
@property
def setup_code(self) -> str:
return self.data["accessory_pin"]
@property
def accessory_pairing_id_bytes(self) -> bytes:
return self.data["accessory_pairing_id"].encode()
@property
def unsuccessful_tries(self) -> int:
return self.data["unsuccessful_tries"]
def register_unsuccessful_try(self):
self.data["unsuccessful_tries"] += 1
self._save_data()
@property
def is_paired(self) -> bool:
return len(self.data["peers"]) > 0
@property
def name(self) -> str:
return self.data["name"]
@property
def category(self) -> str:
try:
category = self.data["category"]
except KeyError:
raise ConfigurationError(
'category missing in "{f}"'.format(f=self.data_file)
)
if category not in Categories:
raise ConfigurationError(
'invalid category "{c}" in "{f}"'.format(c=category, f=self.data_file)
)
return category
def remove_peer(self, pairing_id: bytes):
del self.data["peers"][pairing_id.decode()]
self._save_data()
def set_peer_permissions(self, pairing_id: bytes, admin: bool):
peer = self.data["peers"][pairing_id.decode()]
peer["admin"] = admin
self._save_data()
def add_peer(self, pairing_id: bytes, ltpk: bytes, admin: bool):
self.data["peers"][pairing_id.decode()] = {
"key": binascii.hexlify(ltpk).decode(),
"admin": admin,
}
self._save_data()
def get_peer_key(self, pairing_id: bytes) -> bytes:
if pairing_id.decode() in self.data["peers"]:
return bytes.fromhex(self.data["peers"][pairing_id.decode()]["key"])
else:
return None
def is_peer_admin(self, pairing_id: bytes) -> bool:
return self.data["peers"][pairing_id.decode()]["admin"]
@property
def peers(self):
return self.data["peers"].keys()
@property
def accessory_ltsk(self) -> bytes:
if "accessory_ltsk" in self.data:
return bytes.fromhex(self.data["accessory_ltsk"])
else:
return None
@property
def accessory_ltpk(self) -> bytes:
if "accessory_ltpk" in self.data:
return bytes.fromhex(self.data["accessory_ltpk"])
else:
return None
def set_accessory_keys(self, accessory_ltpk: bytes, accessory_ltsk: bytes):
self.data["accessory_ltpk"] = binascii.hexlify(accessory_ltpk).decode()
self.data["accessory_ltsk"] = binascii.hexlify(accessory_ltsk).decode()[:64]
self._save_data()
@property
def configuration_number(self) -> int:
return self.data["c#"]
def increase_configuration_number(self):
self.data["c#"] += 1
self._save_data()
def check(self, paired=False):
"""
Checks a accessory config file for completeness.
:param paired: if True, check for keys that must exist after successful pairing as well.
:return: None, but a HomeKitConfigurationException is raised if a key is missing
"""
required_fields = [
"name",
"host_ip",
"host_port",
"accessory_pairing_id",
"accessory_pin",
"c#",
"category",
]
if paired:
required_fields.extend(
["accessory_ltpk", "accessory_ltsk", "peers", "unsuccessful_tries"]
)
for f in required_fields:
if f not in self.data:
raise ConfigurationError(
'"{r}" is missing in the config file "{f}"!'.format(
r=f, f=self.data_file
)
)
class AccessoryRequestHandler(BaseHTTPRequestHandler):
VALID_METHODS = [
"GET",
"HEAD",
"POST",
"PUT",
"DELETE",
"CONNECT",
"OPTIONS",
"TRACE",
]
DEBUG_PUT_CHARACTERISTICS = False
DEBUG_CRYPT = False
DEBUG_PAIR_VERIFY = False
DEBUG_GET_CHARACTERISTICS = False
timeout = 300
def __init__(self, request, client_address, server):
# keep pycharm from complaining about those not being define in __init__
self.session_id = "{ip}:{port}".format(
ip=client_address[0], port=client_address[1]
)
if self.session_id not in server.sessions:
server.sessions[self.session_id] = {"handler": self}
self.rfile = None
self.wfile = None
self.body = None
self.PATHMAPPING = {
"/accessories": {"GET": self._get_accessories},
"/characteristics": {
"GET": self._get_characteristics,
"PUT": self._put_characteristics,
},
"/identify": {"POST": self._post_identify},
"/pair-setup": {"POST": self._post_pair_setup},
"/pair-verify": {"POST": self._post_pair_verify},
"/pairings": {"POST": self._post_pairings},
}
self.protocol_version = "HTTP/1.1"
self.close_connection = False
self.timeout_counter = 0
# get the identify callback function from calling server
self.identify_callback = server.identify_callback
self.write_lock = threading.Lock()
self.subscriptions = set()
# init super class
BaseHTTPRequestHandler.__init__(self, request, client_address, server)
def setup(self):
super().setup()
self.orig_wfile = self.wfile
self.orig_rfile = self.rfile
def write_event(self, characteristics):
tmp = []
for (aid, iid) in characteristics:
if (aid, iid) not in self.subscriptions:
continue
char = self._get_characteristic_instance(aid, iid)
tmp.append({"aid": aid, "iid": iid, "value": char.get_value()})
# Bail out if this connection isnt subscribing to any of these characteristics
if not tmp:
return
body = json.dumps({"characteristics": tmp})
event = [
"EVENT/1.0 200 OK",
"Content-Type: application/hap+json",
"Content-Length: {}".format(len(body)),
"",
body,
]
self.write_encrypted_bytes("\r\n".join(event).encode("utf-8"))
def write_encrypted_bytes(self, data):
with self.write_lock:
if AccessoryRequestHandler.DEBUG_CRYPT:
self.log_message("response >%s<", data)
self.log_message("len(response) %s", len(data))
block_size = 1024
out_data = bytearray()
while len(data) > 0:
block = data[:block_size]
if AccessoryRequestHandler.DEBUG_CRYPT:
self.log_message("==> BLOCK: len %s", len(block))
data = data[block_size:]
len_bytes = len(block).to_bytes(2, byteorder="little")
a2c_key = self.server.sessions[self.session_id][
"accessory_to_controller_key"
]
cnt_bytes = self.server.sessions[self.session_id][
"accessory_to_controller_count"
].to_bytes(8, byteorder="little")
ciper_and_mac = chacha20_aead_encrypt(
len_bytes, a2c_key, cnt_bytes, bytes([0, 0, 0, 0]), block
)
self.server.sessions[self.session_id][
"accessory_to_controller_count"
] += 1
out_data += len_bytes + ciper_and_mac
try:
self.orig_wfile.write(out_data)
self.orig_wfile.flush()
except ValueError:
raise DisconnectedControllerError()
def handle_one_request(self):
"""
This is used to determine whether the request is encrypted or not. This is done by looking at the first bytes of
the request. To be valid unencrypted HTTP call, it must be one of the methods defined in RFC7231 Section 4
"Request Methods".
"""
try:
# make connection non blocking so the select can work
self.connection.setblocking(0)
ready = select.select([self.connection], [], [], 1)
# no data was to be received, so we count up to track how many seconds in total this happened
if not ready[0]:
self.timeout_counter += 1
# if this is above our configured timeout the connection gets closed
if self.timeout_counter >= self.timeout:
self.close_connection = True
return
raw_peeked_data = self.rfile.peek(10)
if len(raw_peeked_data) == 0:
# since select says ready but no data is there, close the connection to prevent hidden busy waiting to
# rise load
self.close_connection = True
return
# data was received so reset the timeout handler
self.timeout_counter = 0
# RFC7230 Section 3 tells us, that US-ASCII is fine
peeked_data = raw_peeked_data[:10]
peeked_data = peeked_data.decode(encoding="ASCII")
# self.log_message('deciding over: >%s<', peeked_data)
# If the request line starts with a known HTTP verb, then use handle_one_request from super class
if " " in peeked_data:
method = peeked_data.split(" ", 1)[0]
if method in self.VALID_METHODS:
self.server.sessions[self.session_id]["enrypted_connection"] = False
BaseHTTPRequestHandler.handle_one_request(self)
return
except (socket.timeout, OSError) as e:
# a read or a write timed out. Discard this connection
self.log_error(" %r", e)
self.close_connection = True
return
except UnicodeDecodeError as e:
# this just means it might be encrypted...
self.log_debug("Unicode exception %s" % e)
pass
# the first 2 bytes are the length of the encrypted data to follow
len_bytes = self.rfile.read(2)
data_len = int.from_bytes(len_bytes, byteorder="little")
# the auth tag is not counted, so add its length
data = self.rfile.read(data_len + 16)
if AccessoryRequestHandler.DEBUG_CRYPT:
self.log_message("data >%i< >%s<", len(data), binascii.hexlify(data))
# get the crypto key from the session
c2a_key = self.server.sessions[self.session_id]["controller_to_accessory_key"]
# verify & decrypt the read data
cnt_bytes = self.server.sessions[self.session_id][
"controller_to_accessory_count"
].to_bytes(8, byteorder="little")
decrypted = chacha20_aead_decrypt(
len_bytes, c2a_key, cnt_bytes, bytes([0, 0, 0, 0]), data
)
if decrypted is False:
# crypto error, log it and request close of connection
self.log_error("SEVERE: Could not decrypt %s", binascii.hexlify(data))
self.close_connection = True
return
if AccessoryRequestHandler.DEBUG_CRYPT:
self.log_message("crypted request >%s<", decrypted)
self.server.sessions[self.session_id]["controller_to_accessory_count"] += 1
# replace the original rfile with a fake with the decrypted stuff
old_rfile = self.rfile
self.rfile = io.BytesIO(decrypted)
# replace writefile to pass on encrypted data
old_wfile = self.wfile
self.wfile = io.BytesIO()
# call known function
self.server.sessions[self.session_id]["enrypted_connection"] = True
BaseHTTPRequestHandler.handle_one_request(self)
# read the plaintext and send it out encrypted
self.wfile.seek(0)
in_data = self.wfile.read(65537)
self.write_encrypted_bytes(in_data)
# change back to originals to handle multiple calls
self.rfile = old_rfile
self.wfile = old_wfile
def _get_characteristics(self):
"""
As described on page 84
:return:
"""
if AccessoryRequestHandler.DEBUG_GET_CHARACTERISTICS:
self.log_message("GET /characteristics")
# analyse
params = {}
if "?" in self.path:
params = {
t.split("=")[0]: t.split("=")[1]
for t in self.path.split("?")[1].split("&")
}
# handle id param
ids = []
if "id" in params:
ids = params["id"].split(",")
# handle meta param
meta = False
if "meta" in params:
meta = params["meta"] == "1"
# handle perms param
perms = False
if "perms" in params:
perms = params["perms"] == "1"
# handle type param
include_type = False
if "type" in params:
include_type = params["type"] == "1"
# handle ev param
ev = False
if "ev" in params:
ev = params["ev"] == "1"
if AccessoryRequestHandler.DEBUG_GET_CHARACTERISTICS:
self.log_message(
"query parameters: ids: %s, meta: %s, perms: %s, type: %s, ev: %s",
ids,
meta,
perms,
include_type,
ev,
)
result = {"characteristics": []}
errors = 0
for id_pair in ids:
id_pair = id_pair.split(".")
aid = int(id_pair[0])
cid = int(id_pair[1])
found = False
for accessory in self.server.accessories.accessories:
if accessory.aid != aid:
continue
for service in accessory.services:
for characteristic in service.characteristics:
if characteristic.iid != cid:
continue
found = True
# try to read the characteristic and report possible exceptions as error
try:
value = characteristic.get_value()
result["characteristics"].append(
{"aid": aid, "iid": cid, "value": value}
)
except FormatError:
result["characteristics"].append(
{
"aid": aid,
"iid": cid,
"status": HapStatusCodes.INVALID_VALUE,
}
)
errors += 1
except CharacteristicPermissionError:
result["characteristics"].append(
{
"aid": aid,
"iid": cid,
"status": HapStatusCodes.CANT_READ_WRITE_ONLY,
}
)
errors += 1
except Exception as e:
self.log_error(
"Exception while getting value for %s.%s: %s",
aid,
cid,
str(e),
)
result["characteristics"].append(
{
"aid": aid,
"iid": cid,
"status": HapStatusCodes.OUT_OF_RESOURCES,
}
)
errors += 1
if ev:
# TODO handling of events is missing
result["characteristics"][-1]["ev"] = (
aid,
cid,
) in self.subscriptions
if include_type:
result["characteristics"][-1][
"type"
] = CharacteristicsTypes.get_short_uuid(characteristic.type)
if perms:
result["characteristics"][-1][
"perms"
] = characteristic.perms
if meta:
meta_data = characteristic.get_meta()
for key in meta_data:
result["characteristics"][-1][key] = meta_data[key]
# report missing resources
if not found:
result["characteristics"].append(
{
"aid": aid,
"iid": cid,
"status": HapStatusCodes.RESOURCE_NOT_EXIST,
}
)
errors += 1
if AccessoryRequestHandler.DEBUG_GET_CHARACTERISTICS:
self.log_message("chars: %s", json.dumps(result))
# set the proper status code depending on the count of characteristics and error
if len(result["characteristics"]) == errors:
self.send_response(HttpStatusCodes.BAD_REQUEST)
elif len(result["characteristics"]) > errors > 0:
self.send_response(HttpStatusCodes.MULTI_STATUS)
else:
self.send_response(HttpStatusCodes.OK)
result_bytes = json.dumps(result).encode()
self.send_header("Content-Type", "application/hap+json")
self.send_header("Content-Length", len(result_bytes))
self.end_headers()
self.wfile.write(result_bytes)
def _get_characteristic_instance(self, aid, iid):
for accessory in self.server.accessories.accessories:
if accessory.aid != aid:
continue
for service in accessory.services:
for characteristic in service.characteristics:
if characteristic.iid != iid:
continue
return characteristic
def _put_characteristics(self):
"""
Defined page 80 ff
:return:
"""
if AccessoryRequestHandler.DEBUG_PUT_CHARACTERISTICS:
self.log_message("PUT /characteristics")
self.log_message("body: %s", self.body)
data = json.loads(self.body.decode())
characteristics_to_set = data["characteristics"]
result = {"characteristics": []}
changed = []
errors = 0
for characteristic_to_set in characteristics_to_set:
aid = characteristic_to_set["aid"]
cid = characteristic_to_set["iid"]
found = False
for accessory in self.server.accessories.accessories:
if accessory.aid != aid:
continue
for service in accessory.services:
for characteristic in service.characteristics:
if characteristic.iid != cid:
continue
found = True
if "ev" in characteristic_to_set:
if AccessoryRequestHandler.DEBUG_PUT_CHARACTERISTICS:
self.log_message(
"set ev >%s< >%s< >%s<",
aid,
cid,
characteristic_to_set["ev"],
)
if "ev" in characteristic.perms:
if characteristic_to_set["ev"]:
self.subscriptions.add((aid, cid))
else:
self.subscriptions.discard((aid, cid))
result["characteristics"].append(
{"aid": aid, "iid": cid, "status": 0}
)
else:
result["characteristics"].append(
{
"aid": aid,
"iid": cid,
"status": HapStatusCodes.NOTIFICATION_NOT_SUPPORTED,
}
)
if "value" in characteristic_to_set:
if AccessoryRequestHandler.DEBUG_PUT_CHARACTERISTICS:
self.log_message(
"set value >%s< >%s< >%s<",
aid,
cid,
characteristic_to_set["value"],
)
try:
characteristic.set_value(characteristic_to_set["value"])
result["characteristics"].append(
{"aid": aid, "iid": cid, "status": 0}
)
changed.append((aid, cid))
except FormatError:
result["characteristics"].append(
{
"aid": aid,
"iid": cid,
"status": HapStatusCodes.INVALID_VALUE,
}
)
errors += 1
except Exception as e:
self.log_error(
"Exception while setting value for %s.%s: %s",
aid,
cid,
str(e),
)
result["characteristics"].append(
{
"aid": aid,
"iid": cid,
"status": HapStatusCodes.OUT_OF_RESOURCES,
}
)
errors += 1
# report missing resources
if not found:
result["characteristics"].append(
{
"aid": aid,
"iid": cid,
"status": HapStatusCodes.RESOURCE_NOT_EXIST,
}
)
errors += 1
if changed:
self.server.write_event(changed, self.session_id)
if len(result["characteristics"]) == errors:
self.send_response(HttpStatusCodes.BAD_REQUEST)
elif len(result["characteristics"]) > errors > 0:
self.send_response(HttpStatusCodes.MULTI_STATUS)
else:
self.send_response(HttpStatusCodes.NO_CONTENT)
self.end_headers()
if errors > 0:
result_bytes = json.dumps(result).encode()
self.send_header("Content-Type", "application/hap+json")
self.send_header("Content-Length", len(result_bytes))
self.end_headers()
self.wfile.write(result_bytes)
def _post_identify(self):
if self.server.data.is_paired:
result_bytes = json.dumps(
{"status": HapStatusCodes.INSUFFICIENT_PRIVILEGES}
).encode()
self.send_response(HttpStatusCodes.BAD_REQUEST)
self.send_header("Content-Type", "application/hap+json")
self.send_header("Content-Length", len(result_bytes))
self.end_headers()
self.wfile.write(result_bytes)
else:
# perform identify action
if self.identify_callback:
self.identify_callback()
# send status code
self.send_response(HttpStatusCodes.NO_CONTENT)
self.end_headers()
def _get_accessories(self):
result_bytes = self.server.accessories.to_accessory_and_service_list().encode()
self.send_response(HttpStatusCodes.OK)
self.send_header("Content-Type", "application/hap+json")
self.send_header("Content-Length", len(result_bytes))
self.end_headers()
self.wfile.write(result_bytes)
def _post_pair_verify(self):
d_req = TLV.decode_bytes(self.body)
# Order is not consistent, so force things in to order specified in spec
d_req = TLV.reorder(
d_req,
[TLV.kTLVType_State, TLV.kTLVType_PublicKey, TLV.kTLVType_EncryptedData],
)
d_res = []
if d_req[0][0] == TLV.kTLVType_State and d_req[0][1] == TLV.M1:
# step #2 Accessory -> iOS Device Verify Start Response
if AccessoryRequestHandler.DEBUG_PAIR_VERIFY:
self.log_message("Step #2 /pair-verify")
# 1) generate new curve25519 key pair
accessory_session_key = x25519.X25519PrivateKey.generate()
accessory_spk = accessory_session_key.public_key().public_bytes(
encoding=serialization.Encoding.Raw,
format=serialization.PublicFormat.Raw,
)
self.server.sessions[self.session_id]["accessory_pub_key"] = accessory_spk
# 2) generate shared secret
ios_device_curve25519_pub_key_bytes = bytes(d_req[1][1])
self.server.sessions[self.session_id][
"ios_device_pub_key"
] = ios_device_curve25519_pub_key_bytes
ios_device_curve25519_pub_key = x25519.X25519PublicKey.from_public_bytes(
ios_device_curve25519_pub_key_bytes
)
shared_secret = accessory_session_key.exchange(
ios_device_curve25519_pub_key
)
self.server.sessions[self.session_id]["shared_secret"] = shared_secret
# 3) generate accessory info
accessory_info = (
accessory_spk
+ self.server.data.accessory_pairing_id_bytes
+ ios_device_curve25519_pub_key_bytes
)
# 4) sign accessory info for accessory signature
accessory_ltsk = ed25519.Ed25519PrivateKey.from_private_bytes(
self.server.data.accessory_ltsk
)
accessory_signature = accessory_ltsk.sign(accessory_info)
# 5) sub tlv
sub_tlv = [
(TLV.kTLVType_Identifier, self.server.data.accessory_pairing_id_bytes),
(TLV.kTLVType_Signature, accessory_signature),
]
sub_tlv_b = TLV.encode_list(sub_tlv)
# 6) derive session key
session_key = hkdf_derive(
shared_secret, "Pair-Verify-Encrypt-Salt", "Pair-Verify-Encrypt-Info"
)
self.server.sessions[self.session_id]["session_key"] = session_key
# 7) encrypt sub tlv
encrypted_data_with_auth_tag = chacha20_aead_encrypt(
bytes(),
session_key,
"PV-Msg02".encode(),
bytes([0, 0, 0, 0]),
sub_tlv_b,
)
# 8) construct result tlv
d_res.append((TLV.kTLVType_State, TLV.M2,))
d_res.append((TLV.kTLVType_PublicKey, accessory_spk))
d_res.append((TLV.kTLVType_EncryptedData, encrypted_data_with_auth_tag))
self._send_response_tlv(d_res)
if AccessoryRequestHandler.DEBUG_PAIR_VERIFY:
self.log_message("after step #2\n%s", TLV.to_string(d_res))
return
if d_req[0][0] == TLV.kTLVType_State and d_req[0][1] == TLV.M3:
# step #4 Accessory -> iOS Device Verify Finish Response
if AccessoryRequestHandler.DEBUG_PAIR_VERIFY:
self.log_message("Step #4 /pair-verify")
session_key = self.server.sessions[self.session_id]["session_key"]
# 1) verify ios' authtag
# 2) decrypt
encrypted = d_req[1][1]
decrypted = chacha20_aead_decrypt(
bytes(),
session_key,
"PV-Msg03".encode(),
bytes([0, 0, 0, 0]),
encrypted,
)
if decrypted is False:
self.send_error_reply(TLV.M4, TLV.kTLVError_Authentication)
self.log_error(
"error in step #4: authtag %s %s", d_res, self.server.sessions
)
return
d1 = TLV.decode_bytes(decrypted)
assert d1[0][0] == TLV.kTLVType_Identifier
assert d1[1][0] == TLV.kTLVType_Signature
# 3) get ios_device_ltpk
ios_device_pairing_id = d1[0][1]
self.server.sessions[self.session_id][
"ios_device_pairing_id"
] = ios_device_pairing_id
ios_device_ltpk_bytes = self.server.data.get_peer_key(ios_device_pairing_id)
if ios_device_ltpk_bytes is None:
self.send_error_reply(TLV.M4, TLV.kTLVError_Authentication)
self.log_error(
"error in step #4: not paired %s %s", d_res, self.server.sessions
)
return
ios_device_ltpk = ed25519.Ed25519PublicKey.from_public_bytes(
ios_device_ltpk_bytes
)
# 4) verify ios_device_info
ios_device_sig = d1[1][1]
ios_device_curve25519_pub_key_bytes = self.server.sessions[self.session_id][
"ios_device_pub_key"
]
accessory_spk = self.server.sessions[self.session_id]["accessory_pub_key"]
ios_device_info = (
ios_device_curve25519_pub_key_bytes
+ ios_device_pairing_id
+ accessory_spk
)
try:
ios_device_ltpk.verify(bytes(ios_device_sig), bytes(ios_device_info))
except cryptography_exceptions.InvalidSignature:
self.send_error_reply(TLV.M4, TLV.kTLVError_Authentication)
self.log_error(
"error in step #4: signature %s %s", d_res, self.server.sessions