mirror of
https://github.com/Ryujinx/ryuko-ng.git
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124 lines
4 KiB
Python
124 lines
4 KiB
Python
from discord.ext.commands import Cog
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import re
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import config
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import secrets
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import asyncio
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class YubicoOTP(Cog):
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def __init__(self, bot):
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self.bot = bot
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self.otp_re = re.compile("(cc|vv)[cbdefghijklnrtuv]{42}$")
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self.api_servers = [
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"https://api.yubico.com",
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"https://api2.yubico.com",
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"https://api3.yubico.com",
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"https://api4.yubico.com",
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"https://api5.yubico.com",
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]
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self.reuse_responses = ["BAD_OTP", "REPLAYED_OTP"]
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self.bad_responses = [
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"MISSING_PARAMETER",
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"NO_SUCH_CLIENT",
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"OPERATION_NOT_ALLOWED",
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]
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self.modhex_to_hex_conversion_map = {
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"c": "0",
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"b": "1",
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"d": "2",
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"e": "3",
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"f": "4",
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"g": "5",
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"h": "6",
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"i": "7",
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"j": "8",
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"k": "9",
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"l": "a",
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"n": "b",
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"r": "c",
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"t": "d",
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"u": "e",
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"v": "f",
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}
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def get_serial(self, otp):
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"""Get OTP from serial, based on code by linuxgemini"""
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if otp[:2] != "cc":
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return False
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hexconv = []
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for modhexletter in otp[0:12]:
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hexconv.append(self.modhex_to_hex_conversion_map[modhexletter])
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return int("".join(hexconv), 16)
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async def validate_yubico_otp(self, otp):
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nonce = secrets.token_hex(15) # Random number in the valid range
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for api_server in self.api_servers:
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url = f"{api_server}/wsapi/2.0/verify?id={config.yubico_otp_client_id}&otp={otp}&nonce={nonce}"
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try:
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resp = await self.bot.aiosession.get(url)
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assert resp.status == 200
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except Exception as ex:
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self.bot.log.warning(
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f"Got {repr(ex)} on {api_server} with otp {otp}."
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)
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continue
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resptext = await resp.text()
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# Turn the fields to a python dict for easier parsing
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datafields = resptext.strip().split("\r\n")
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datafields = {line.split("=")[0]: line.split("=")[1] for line in datafields}
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datafields["nonce"] != nonce
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# If we got a success, then return True
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if datafields["status"] == "OK":
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return True
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elif datafields["status"] in self.reuse_responses:
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return False
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# If status isn't an expected one, log it
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self.bot.log.warning(
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f"Got {repr(datafields)} on {api_server} with otp {otp} and nonce {nonce}"
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)
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# If we fucked up in a way we can't recover from, just return None
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if datafields["status"] in self.bad_responses:
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return None
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# Return None if we fail to get responses from any server
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return None
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@Cog.listener()
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async def on_message(self, message):
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await self.bot.wait_until_ready()
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strin = self.otp_re.match(message.content.strip())
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if strin:
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otp = strin.string
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# Validate OTP
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validation_result = await self.validate_yubico_otp(otp)
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if validation_result is not True:
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return
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# Derive serial and a string to use it
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serial = self.get_serial(otp)
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serial_str = f" (serial: `{serial}`)" if serial else ""
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# If the message content is _just_ the OTP code, delete it too
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if message.content.strip() == otp:
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await message.delete()
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# If OTP is valid, tell user that it was revoked
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msg = await message.channel.send(
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f"{message.author.mention}: Ate Yubico OTP `{otp}`{serial_str}"
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". This message will self destruct in 5 seconds."
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)
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# and delete message after 5s to help SNR
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await asyncio.sleep(5)
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await msg.delete()
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def setup(bot):
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bot.add_cog(YubicoOTP(bot))
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