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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';
import { ensure } from '../../../../../prelude/ensure';
import config from '../../../../../config';
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.findOne(user.id).then(ensure);
// 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
};
});
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