yackermann · November 30, 2021 10:47 · kranthi2210 · Nov 16, 2021 · VovkViktor · Nov 22, 2021
diff --git a/verify.safetynet.webauthn.js b/verify.safetynet.webauthn.js
 const crypto    = require('crypto');
 const base64url = require('base64url');
 const cbor      = require('cbor');
 const jsrsasign = require('jsrsasign');

 let gsr2 = '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';

 let hash = (alg, message) => {
    return crypto.createHash(alg).update(message).digest();
 }

 var getCertificateSubject = (certificate) => {
    let subjectCert = new jsrsasign.X509();
    subjectCert.readCertPEM(certificate);

    let subjectString = subjectCert.getSubjectString();
    let subjectFields = subjectString.slice(1).split('/');

    let fields = {};
    for(let field of subjectFields) {
        let kv = field.split('=');
        fields[kv[0]] = kv[1];
    }

    return fields
 }

 var validateCertificatePath = (certificates) => {
    if((new Set(certificates)).size !== certificates.length)
        throw new Error('Failed to validate certificates path! Dublicate certificates detected!');

    for(let i = 0; i < certificates.length; i++) {
        let subjectPem  = certificates[i];
        let subjectCert = new jsrsasign.X509();
        subjectCert.readCertPEM(subjectPem);

        let issuerPem = '';
        if(i + 1 >= certificates.length)
            issuerPem = subjectPem;
        else
            issuerPem = certificates[i + 1];

        let issuerCert = new jsrsasign.X509();
        issuerCert.readCertPEM(issuerPem);

        if(subjectCert.getIssuerString() !== issuerCert.getSubjectString())
            throw new Error('Failed to validate certificate path! Issuers dont match!');

        let subjectCertStruct = jsrsasign.ASN1HEX.getTLVbyList(subjectCert.hex, 0, [0]);
        let algorithm         = subjectCert.getSignatureAlgorithmField();
        let signatureHex      = subjectCert.getSignatureValueHex()

        let Signature = new jsrsasign.crypto.Signature({alg: algorithm});
        Signature.init(issuerPem);
        Signature.updateHex(subjectCertStruct);

        if(!Signature.verify(signatureHex))
            throw new Error('Failed to validate certificate path!')
    }

    return true
 }

 let verifySafetyNetAttestation = (webAuthnResponse) => {
    let attestationBuffer = base64url.toBuffer(webAuthnResponse.response.attestationObject);
    let attestationStruct = cbor.decodeAllSync(attestationBuffer)[0];

    let jwsString         = attestationStruct.attStmt.response.toString('utf8');
    let jwsParts          = jwsString.split('.');

    let HEADER    = JSON.parse(base64url.decode(jwsParts[0]));
    let PAYLOAD   = JSON.parse(base64url.decode(jwsParts[1]));
    let SIGNATURE = jwsParts[2];

 /* ----- Verify payload ----- */
    let clientDataHashBuf = hash('sha256', base64url.toBuffer(webAuthnResponse.response.clientDataJSON));
    let nonceBase     = Buffer.concat([attestationStruct.authData, clientDataHashBuf]);
    let nonceBuffer   = hash('sha256', nonceBase);
    let expectedNonce = nonceBuffer.toString('base64');

    if(PAYLOAD.nonce !== expectedNonce)
        throw new Error(`PAYLOAD.nonce does not contains expected nonce! Expected ${PAYLOAD.nonce} to equal ${expectedNonce}!`);

    if(!PAYLOAD.ctsProfileMatch)
        throw new Error('PAYLOAD.ctsProfileMatch is FALSE!');
 /* ----- Verify payload ENDS ----- */


 /* ----- Verify header ----- */
    let certPath = HEADER.x5c.concat([gsr2]).map((cert) => {
        let pemcert = '';
        for(let i = 0; i < cert.length; i += 64)
            pemcert += cert.slice(i, i + 64) + '\n';

        return '-----BEGIN CERTIFICATE-----\n' + pemcert + '-----END CERTIFICATE-----';
    })

    if(getCertificateSubject(certPath[0]).CN !== 'attest.android.com')
        throw new Error('The common name is not set to "attest.android.com"!');

    validateCertificatePath(certPath);
 /* ----- Verify header ENDS ----- */

 /* ----- Verify signature ----- */
    let signatureBaseBuffer = Buffer.from(jwsParts[0] + '.' + jwsParts[1]);
    let certificate         = certPath[0];
    let signatureBuffer     = base64url.toBuffer(SIGNATURE);

    let signatureIsValid    = crypto.createVerify('sha256')
        .update(signatureBaseBuffer)
        .verify(certificate, signatureBuffer);

    if(!signatureIsValid)
        throw new Error('Failed to verify the signature!');

 /* ----- Verify signature ENDS ----- */
    
    return true
 }



 let safetyNetWebAuthnSample = {
    "rawId": "AZD7huwZVx7aW1efRa6Uq3JTQNorj3qA9yrLINXEcgvCQYtWiSQa1eOIVrXfCmip6MzP8KaITOvRLjy3TUHO7_c",
    "id": "AZD7huwZVx7aW1efRa6Uq3JTQNorj3qA9yrLINXEcgvCQYtWiSQa1eOIVrXfCmip6MzP8KaITOvRLjy3TUHO7_c",
    "response": {
        "clientDataJSON": "eyJ0eXBlIjoid2ViYXV0aG4uY3JlYXRlIiwiY2hhbGxlbmdlIjoiVGY2NWJTNkQ1dGVtaDJCd3ZwdHFnQlBiMjVpWkRSeGp3QzVhbnM5MUlJSkRyY3JPcG5XVEs0TFZnRmplVVY0R0RNZTQ0dzhTSTVOc1pzc0lYVFV2RGciLCJvcmlnaW4iOiJodHRwczpcL1wvd2ViYXV0aG4ub3JnIiwiYW5kcm9pZFBhY2thZ2VOYW1lIjoiY29tLmFuZHJvaWQuY2hyb21lIn0",
        "attestationObject": "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_wpohM69EuPLdNQc7v96UBAgMmIAEhWCBVEWSlJerLbRupcvBaXA5Cqpp1Ba46HZTH-dqgmeMCYSJYIIlzYLPXaVavxbpZ4G6ZJWJ6hwW_NgiKAHpSNL8Bwf_d"
    }
 }

 verifySafetyNetAttestation(safetyNetWebAuthnSample)
	const crypto = require('crypto');
	const base64url = require('base64url');
	const cbor = require('cbor');
	const jsrsasign = require('jsrsasign');

	let gsr2 = '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';

	let hash = (alg, message) => {
	return crypto.createHash(alg).update(message).digest();
	}

	var getCertificateSubject = (certificate) => {
	let subjectCert = new jsrsasign.X509();
	subjectCert.readCertPEM(certificate);

	let subjectString = subjectCert.getSubjectString();
	let subjectFields = subjectString.slice(1).split('/');

	let fields = {};
	for(let field of subjectFields) {
	let kv = field.split('=');
	fields[kv[0]] = kv[1];
	}

	return fields
	}

	var validateCertificatePath = (certificates) => {
	if((new Set(certificates)).size !== certificates.length)
	throw new Error('Failed to validate certificates path! Dublicate certificates detected!');

	for(let i = 0; i < certificates.length; i++) {
	let subjectPem = certificates[i];
	let subjectCert = new jsrsasign.X509();
	subjectCert.readCertPEM(subjectPem);

	let issuerPem = '';
	if(i + 1 >= certificates.length)
	issuerPem = subjectPem;
	else
	issuerPem = certificates[i + 1];

	let issuerCert = new jsrsasign.X509();
	issuerCert.readCertPEM(issuerPem);

	if(subjectCert.getIssuerString() !== issuerCert.getSubjectString())
	throw new Error('Failed to validate certificate path! Issuers dont match!');

	let subjectCertStruct = jsrsasign.ASN1HEX.getTLVbyList(subjectCert.hex, 0, [0]);
	let algorithm = subjectCert.getSignatureAlgorithmField();
	let signatureHex = subjectCert.getSignatureValueHex()

	let Signature = new jsrsasign.crypto.Signature({alg: algorithm});
	Signature.init(issuerPem);
	Signature.updateHex(subjectCertStruct);

	if(!Signature.verify(signatureHex))
	throw new Error('Failed to validate certificate path!')
	}

	return true
	}

	let verifySafetyNetAttestation = (webAuthnResponse) => {
	let attestationBuffer = base64url.toBuffer(webAuthnResponse.response.attestationObject);
	let attestationStruct = cbor.decodeAllSync(attestationBuffer)[0];

	let jwsString = attestationStruct.attStmt.response.toString('utf8');
	let jwsParts = jwsString.split('.');

	let HEADER = JSON.parse(base64url.decode(jwsParts[0]));
	let PAYLOAD = JSON.parse(base64url.decode(jwsParts[1]));
	let SIGNATURE = jwsParts[2];

	/* ----- Verify payload ----- */
	let clientDataHashBuf = hash('sha256', base64url.toBuffer(webAuthnResponse.response.clientDataJSON));
	let nonceBase = Buffer.concat([attestationStruct.authData, clientDataHashBuf]);
	let nonceBuffer = hash('sha256', nonceBase);
	let expectedNonce = nonceBuffer.toString('base64');

	if(PAYLOAD.nonce !== expectedNonce)
	throw new Error(`PAYLOAD.nonce does not contains expected nonce! Expected ${PAYLOAD.nonce} to equal ${expectedNonce}!`);

	if(!PAYLOAD.ctsProfileMatch)
	throw new Error('PAYLOAD.ctsProfileMatch is FALSE!');
	/* ----- Verify payload ENDS ----- */


	/* ----- Verify header ----- */
	let certPath = HEADER.x5c.concat([gsr2]).map((cert) => {
	let pemcert = '';
	for(let i = 0; i < cert.length; i += 64)
	pemcert += cert.slice(i, i + 64) + '\n';

	return '-----BEGIN CERTIFICATE-----\n' + pemcert + '-----END CERTIFICATE-----';
	})

	if(getCertificateSubject(certPath[0]).CN !== 'attest.android.com')
	throw new Error('The common name is not set to "attest.android.com"!');

	validateCertificatePath(certPath);
	/* ----- Verify header ENDS ----- */

	/* ----- Verify signature ----- */
	let signatureBaseBuffer = Buffer.from(jwsParts[0] + '.' + jwsParts[1]);
	let certificate = certPath[0];
	let signatureBuffer = base64url.toBuffer(SIGNATURE);

	let signatureIsValid = crypto.createVerify('sha256')
	.update(signatureBaseBuffer)
	.verify(certificate, signatureBuffer);

	if(!signatureIsValid)
	throw new Error('Failed to verify the signature!');

	/* ----- Verify signature ENDS ----- */

	return true
	}



	let safetyNetWebAuthnSample = {
	"rawId": "AZD7huwZVx7aW1efRa6Uq3JTQNorj3qA9yrLINXEcgvCQYtWiSQa1eOIVrXfCmip6MzP8KaITOvRLjy3TUHO7_c",
	"id": "AZD7huwZVx7aW1efRa6Uq3JTQNorj3qA9yrLINXEcgvCQYtWiSQa1eOIVrXfCmip6MzP8KaITOvRLjy3TUHO7_c",
	"response": {
	"clientDataJSON": "eyJ0eXBlIjoid2ViYXV0aG4uY3JlYXRlIiwiY2hhbGxlbmdlIjoiVGY2NWJTNkQ1dGVtaDJCd3ZwdHFnQlBiMjVpWkRSeGp3QzVhbnM5MUlJSkRyY3JPcG5XVEs0TFZnRmplVVY0R0RNZTQ0dzhTSTVOc1pzc0lYVFV2RGciLCJvcmlnaW4iOiJodHRwczpcL1wvd2ViYXV0aG4ub3JnIiwiYW5kcm9pZFBhY2thZ2VOYW1lIjoiY29tLmFuZHJvaWQuY2hyb21lIn0",
	"attestationObject": "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	}
	}

	verifySafetyNetAttestation(safetyNetWebAuthnSample)