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/*
Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
Copyright (C) 2023 Spacebar and Spacebar Contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import { route } from "@fosscord/api";
import {
generateToken,
SecurityKey,
User,
verifyWebAuthnToken,
WebAuthn,
WebAuthnTotpSchema,
} from "@fosscord/util";
import { Request, Response, Router } from "express";
import { ExpectedAssertionResult } from "fido2-lib";
import { HTTPError } from "lambert-server";
const router = Router();
function toArrayBuffer(buf: Buffer) {
const ab = new ArrayBuffer(buf.length);
const view = new Uint8Array(ab);
for (let i = 0; i < buf.length; ++i) {
view[i] = buf[i];
}
return ab;
}
router.post(
"/",
route({ body: "WebAuthnTotpSchema" }),
async (req: Request, res: Response) => {
if (!WebAuthn.fido2) {
// TODO: I did this for typescript and I can't use !
throw new Error("WebAuthn not enabled");
}
const { code, ticket } = req.body as WebAuthnTotpSchema;
const user = await User.findOneOrFail({
where: {
totp_last_ticket: ticket,
},
select: ["id"],
relations: ["settings"],
});
const ret = await verifyWebAuthnToken(ticket);
if (!ret)
throw new HTTPError(req.t("auth:login.INVALID_TOTP_CODE"), 60008);
await User.update({ id: user.id }, { totp_last_ticket: "" });
const clientAttestationResponse = JSON.parse(code);
if (!clientAttestationResponse.rawId)
throw new HTTPError("Missing rawId", 400);
clientAttestationResponse.rawId = toArrayBuffer(
Buffer.from(clientAttestationResponse.rawId, "base64url"),
);
const securityKey = await SecurityKey.findOneOrFail({
where: {
key_id: Buffer.from(
clientAttestationResponse.rawId,
"base64url",
).toString("base64"),
},
});
const assertionExpectations: ExpectedAssertionResult = JSON.parse(
Buffer.from(
clientAttestationResponse.response.clientDataJSON,
"base64",
).toString(),
);
const authnResult = await WebAuthn.fido2.assertionResult(
clientAttestationResponse,
{
...assertionExpectations,
factor: "second",
publicKey: securityKey.public_key,
prevCounter: securityKey.counter,
userHandle: securityKey.key_id,
},
);
const counter = authnResult.authnrData.get("counter");
securityKey.counter = counter;
await securityKey.save();
return res.json({
token: await generateToken(user.id),
user_settings: user.settings,
});
},
);
export default router;
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