diff --git a/src/api/routes/auth/mfa/webauthn.ts b/src/api/routes/auth/mfa/webauthn.ts
new file mode 100644
index 00000000..e574b969
--- /dev/null
+++ b/src/api/routes/auth/mfa/webauthn.ts
@@ -0,0 +1,112 @@
+/*
+ Fosscord: A FOSS re-implementation and extension of the Discord.com backend.
+ Copyright (C) 2023 Fosscord and Fosscord 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", "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);
+ const securityKey = await SecurityKey.findOneOrFail({
+ where: {
+ user_id: req.user_id,
+ key_id: clientAttestationResponse.rawId,
+ },
+ });
+
+ if (!clientAttestationResponse.rawId)
+ throw new HTTPError("Missing rawId", 400);
+
+ clientAttestationResponse.rawId = toArrayBuffer(
+ Buffer.from(clientAttestationResponse.rawId, "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;
|
