refactoring

Resolve #7779

packages/backend/src/server/api/endpoints/i/2fa/key-done.ts

@@ -0,0 +1,150 @@
+import $ from 'cafy';
+import * as bcrypt from 'bcryptjs';
+import { promisify } from 'util';
+import * as cbor from 'cbor';
+import define from '../../../define';
+import {
+	UserProfiles,
+	UserSecurityKeys,
+	AttestationChallenges,
+	Users
+} from '@/models/index';
+import config from '@/config/index';
+import { procedures, hash } from '../../../2fa';
+import { publishMainStream } from '@/services/stream';
+
+const cborDecodeFirst = promisify(cbor.decodeFirst) as any;
+
+export const meta = {
+	requireCredential: true as const,
+
+	secure: true,
+
+	params: {
+		clientDataJSON: {
+			validator: $.str
+		},
+		attestationObject: {
+			validator: $.str
+		},
+		password: {
+			validator: $.str
+		},
+		challengeId: {
+			validator: $.str
+		},
+		name: {
+			validator: $.str
+		}
+	}
+};
+
+const rpIdHashReal = hash(Buffer.from(config.hostname, 'utf-8'));
+
+export default define(meta, async (ps, user) => {
+	const profile = await UserProfiles.findOneOrFail(user.id);
+
+	// Compare password
+	const same = await bcrypt.compare(ps.password, profile.password!);
+
+	if (!same) {
+		throw new Error('incorrect password');
+	}
+
+	if (!profile.twoFactorEnabled) {
+		throw new Error('2fa not enabled');
+	}
+
+	const clientData = JSON.parse(ps.clientDataJSON);
+
+	if (clientData.type != 'webauthn.create') {
+		throw new Error('not a creation attestation');
+	}
+	if (clientData.origin != config.scheme + '://' + config.host) {
+		throw new Error('origin mismatch');
+	}
+
+	const clientDataJSONHash = hash(Buffer.from(ps.clientDataJSON, 'utf-8'));
+
+	const attestation = await cborDecodeFirst(ps.attestationObject);
+
+	const rpIdHash = attestation.authData.slice(0, 32);
+	if (!rpIdHashReal.equals(rpIdHash)) {
+		throw new Error('rpIdHash mismatch');
+	}
+
+	const flags = attestation.authData[32];
+
+	// tslint:disable-next-line:no-bitwise
+	if (!(flags & 1)) {
+		throw new Error('user not present');
+	}
+
+	const authData = Buffer.from(attestation.authData);
+	const credentialIdLength = authData.readUInt16BE(53);
+	const credentialId = authData.slice(55, 55 + credentialIdLength);
+	const publicKeyData = authData.slice(55 + credentialIdLength);
+	const publicKey: Map<number, any> = await cborDecodeFirst(publicKeyData);
+	if (publicKey.get(3) != -7) {
+		throw new Error('alg mismatch');
+	}
+
+	if (!(procedures as any)[attestation.fmt]) {
+		throw new Error('unsupported fmt');
+	}
+
+	const verificationData = (procedures as any)[attestation.fmt].verify({
+		attStmt: attestation.attStmt,
+		authenticatorData: authData,
+		clientDataHash: clientDataJSONHash,
+		credentialId,
+		publicKey,
+		rpIdHash
+	});
+	if (!verificationData.valid) throw new Error('signature invalid');
+
+	const attestationChallenge = await AttestationChallenges.findOne({
+		userId: user.id,
+		id: ps.challengeId,
+		registrationChallenge: true,
+		challenge: hash(clientData.challenge).toString('hex')
+	});
+
+	if (!attestationChallenge) {
+		throw new Error('non-existent challenge');
+	}
+
+	await AttestationChallenges.delete({
+		userId: user.id,
+		id: ps.challengeId
+	});
+
+	// Expired challenge (> 5min old)
+	if (
+		new Date().getTime() - attestationChallenge.createdAt.getTime() >=
+		5 * 60 * 1000
+	) {
+		throw new Error('expired challenge');
+	}
+
+	const credentialIdString = credentialId.toString('hex');
+
+	await UserSecurityKeys.save({
+		userId: user.id,
+		id: credentialIdString,
+		lastUsed: new Date(),
+		name: ps.name,
+		publicKey: verificationData.publicKey.toString('hex')
+	});
+
+	// Publish meUpdated event
+	publishMainStream(user.id, 'meUpdated', await Users.pack(user.id, user, {
+		detail: true,
+		includeSecrets: true
+	}));
+
+	return {
+		id: credentialIdString,
+		name: ps.name
+	};
+});