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/* eslint-disable @typescript-eslint/ban-ts-comment */
// `ASN1HEX` exists in the lib but not in its typings
// @ts-ignore 2305
import { KJUR, X509, ASN1HEX, zulutodate } from 'jsrsasign';
import isCertRevoked from './isCertRevoked';
const { crypto } = KJUR;
/**
* Traverse an array of PEM certificates and ensure they form a proper chain
* @param certificates Typically the result of `x5c.map(convertASN1toPEM)`
*/
export default async function validateCertificatePath(certificates: string[]): Promise<boolean> {
if (new Set(certificates).size !== certificates.length) {
throw new Error('Invalid certificate path: found duplicate certificates');
}
// From leaf to root, make sure each cert is issued by the next certificate in the chain
for (let i = 0; i < certificates.length; i += 1) {
const subjectPem = certificates[i];
const subjectCert = new X509();
subjectCert.readCertPEM(subjectPem);
let issuerPem = '';
if (i + 1 >= certificates.length) {
issuerPem = subjectPem;
} else {
issuerPem = certificates[i + 1];
}
const issuerCert = new X509();
issuerCert.readCertPEM(issuerPem);
// Check for certificate revocation
const subjectCertRevoked = await isCertRevoked(subjectCert);
if (subjectCertRevoked) {
throw new Error(`Found revoked certificate in certificate path`);
}
// Check that intermediate certificate is within its valid time window
const notBefore = zulutodate(issuerCert.getNotBefore());
const notAfter = zulutodate(issuerCert.getNotAfter());
const now = new Date();
if (notBefore > now || notAfter < now) {
throw new Error('Intermediate certificate is not yet valid or expired');
}
if (subjectCert.getIssuerString() !== issuerCert.getSubjectString()) {
throw new Error('Invalid certificate path: subject issuer did not match issuer subject');
}
const subjectCertStruct = ASN1HEX.getTLVbyList(subjectCert.hex, 0, [0]);
const alg = subjectCert.getSignatureAlgorithmField();
const signatureHex = subjectCert.getSignatureValueHex();
const Signature = new crypto.Signature({ alg });
Signature.init(issuerPem);
Signature.updateHex(subjectCertStruct);
if (!Signature.verify(signatureHex)) {
throw new Error('Invalid certificate path: invalid signature');
}
}
return true;
}
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