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/*
Spacebar: 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 {
CreateWebAuthnCredentialSchema,
DiscordApiErrors,
FieldErrors,
GenerateWebAuthnCredentialsSchema,
generateWebAuthnTicket,
SecurityKey,
User,
verifyWebAuthnToken,
WebAuthn,
WebAuthnPostSchema,
} from "@fosscord/util";
import bcrypt from "bcrypt";
import { Request, Response, Router } from "express";
import { ExpectedAttestationResult } from "fido2-lib";
import { HTTPError } from "lambert-server";
const router = Router();
const isGenerateSchema = (
body: WebAuthnPostSchema,
): body is GenerateWebAuthnCredentialsSchema => {
return "password" in body;
};
const isCreateSchema = (
body: WebAuthnPostSchema,
): body is CreateWebAuthnCredentialSchema => {
return "credential" in body;
};
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.get("/", route({}), async (req: Request, res: Response) => {
const securityKeys = await SecurityKey.find({
where: {
user_id: req.user_id,
},
});
return res.json(
securityKeys.map((key) => ({
id: key.id,
name: key.name,
})),
);
});
router.post(
"/",
route({ body: "WebAuthnPostSchema" }),
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 user = await User.findOneOrFail({
where: {
id: req.user_id,
},
select: [
"data",
"id",
"disabled",
"deleted",
"totp_secret",
"mfa_enabled",
"username",
],
relations: ["settings"],
});
if (isGenerateSchema(req.body)) {
const { password } = req.body;
const same_password = await bcrypt.compare(
password,
user.data.hash || "",
);
if (!same_password) {
throw FieldErrors({
password: {
message: req.t("auth:login.INVALID_PASSWORD"),
code: "INVALID_PASSWORD",
},
});
}
const registrationOptions =
await WebAuthn.fido2.attestationOptions();
const challenge = JSON.stringify({
publicKey: {
...registrationOptions,
challenge: Buffer.from(
registrationOptions.challenge,
).toString("base64"),
user: {
id: user.id,
name: user.username,
displayName: user.username,
},
},
});
const ticket = await generateWebAuthnTicket(challenge);
return res.json({
ticket: ticket,
challenge,
});
} else if (isCreateSchema(req.body)) {
const { credential, name, ticket } = req.body;
const verified = await verifyWebAuthnToken(ticket);
if (!verified) throw new HTTPError("Invalid ticket", 400);
const clientAttestationResponse = JSON.parse(credential);
if (!clientAttestationResponse.rawId)
throw new HTTPError("Missing rawId", 400);
const rawIdBuffer = Buffer.from(
clientAttestationResponse.rawId,
"base64",
);
clientAttestationResponse.rawId = toArrayBuffer(rawIdBuffer);
const attestationExpectations: ExpectedAttestationResult =
JSON.parse(
Buffer.from(
clientAttestationResponse.response.clientDataJSON,
"base64",
).toString(),
);
const regResult = await WebAuthn.fido2.attestationResult(
clientAttestationResponse,
{
...attestationExpectations,
factor: "second",
},
);
const authnrData = regResult.authnrData;
const keyId = Buffer.from(authnrData.get("credId")).toString(
"base64",
);
const counter = authnrData.get("counter");
const publicKey = authnrData.get("credentialPublicKeyPem");
const securityKey = SecurityKey.create({
name,
counter,
public_key: publicKey,
user_id: req.user_id,
key_id: keyId,
});
await Promise.all([
securityKey.save(),
User.update({ id: req.user_id }, { webauthn_enabled: true }),
]);
return res.json({
name,
id: securityKey.id,
});
} else {
throw DiscordApiErrors.INVALID_AUTHENTICATION_TOKEN;
}
},
);
export default router;
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