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import abc
import os
import struct
import subprocess
from google.auth import exceptions
from google.oauth2.webauthn_types import GetRequest, GetResponse
class WebAuthnHandler(abc.ABC):
@abc.abstractmethod
def is_available(self) -> bool:
"""Check whether this WebAuthn handler is available"""
raise NotImplementedError("is_available method must be implemented")
@abc.abstractmethod
def get(self, get_request: GetRequest) -> GetResponse:
"""WebAuthn get (assertion)"""
raise NotImplementedError("get method must be implemented")
class PluginHandler(WebAuthnHandler):
"""Offloads WebAuthn get reqeust to a pluggable command-line tool.
Offloads WebAuthn get to a plugin which takes the form of a
command-line tool. The command-line tool is configurable via the
PluginHandler._ENV_VAR environment variable.
The WebAuthn plugin should implement the following interface:
Communication occurs over stdin/stdout, and messages are both sent and
received in the form:
[4 bytes - payload size (little-endian)][variable bytes - json payload]
"""
_ENV_VAR = "GOOGLE_AUTH_WEBAUTHN_PLUGIN"
def is_available(self) -> bool:
try:
self._find_plugin()
except Exception:
return False
else:
return True
def get(self, get_request: GetRequest) -> GetResponse:
request_json = get_request.to_json()
cmd = self._find_plugin()
response_json = self._call_plugin(cmd, request_json)
return GetResponse.from_json(response_json)
def _call_plugin(self, cmd: str, input_json: str) -> str:
# Calculate length of input
input_length = len(input_json)
length_bytes_le = struct.pack("<I", input_length)
request = length_bytes_le + input_json.encode()
# Call plugin
process_result = subprocess.run(
[cmd], input=request, capture_output=True, check=True
)
# Check length of response
response_len_le = process_result.stdout[:4]
response_len = struct.unpack("<I", response_len_le)[0]
response = process_result.stdout[4:]
if response_len != len(response):
raise exceptions.MalformedError(
"Plugin response length {} does not match data {}".format(
response_len, len(response)
)
)
return response.decode()
def _find_plugin(self) -> str:
plugin_cmd = os.environ.get(PluginHandler._ENV_VAR)
if plugin_cmd is None:
raise exceptions.InvalidResource(
"{} env var is not set".format(PluginHandler._ENV_VAR)
)
return plugin_cmd