node-opcua/node-opcua-crypto

import {
  coerceCertificate,
  readTag,
  _readStruct,
  readTbsCertificate
} from "node-opcua-crypto";
import assert from "assert";

/*
  The folowing test certificates should reflect the following configurations of
  openssl x509_v3 extensions:
  1. basicConstraints = critical, CA:false
  2. basicConstraints = critical, pathlen:0
  3. basicConstraints = critical, CA:false, pathlen:0
  4. basicConstraints = critical, CA:true, pathlen:0
*/
const CERT_1 = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`;

const CERT_2 = `-----BEGIN CERTIFICATE-----
MIIFLTCCAxWgAwIBAgIUCN0fSyBLHVoXRHgGkYBzXK9EvD8wDQYJKoZIhvcNAQEL
BQAwJTEjMCEGA1UEAwwacmVhZEJhc2ljQ29uc3RyYWludC4yLnRlc3QwIBcNMjMw
OTAxMTUxMjA3WhgPMjEyMzA4MDgxNTEyMDdaMCUxIzAhBgNVBAMMGnJlYWRCYXNp
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2Tk7TfUTjYqGqF4mmaCZ8fn9UjkMjYDyJHHxTzbQLLD6eD629T7J52NXs5vpATJJ
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KMlbA1/K6ftQOIinpkUfWfleizPrg2uk5fpyvF7OasGp/Bqg2i9lG7vRGlha8EqS
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RM//xentknWuHSqin8bo/gAZqNWz1/gnbppo3oBADthn
-----END CERTIFICATE-----`;

const CERT_3 = `-----BEGIN CERTIFICATE-----
MIIFLTCCAxWgAwIBAgIUO5QVmZxK1bq9+kNe06kM8eY2QEIwDQYJKoZIhvcNAQEL
BQAwJTEjMCEGA1UEAwwacmVhZEJhc2ljQ29uc3RyYWludC4zLnRlc3QwIBcNMjMw
OTAxMTUxMjA3WhgPMjEyMzA4MDgxNTEyMDdaMCUxIzAhBgNVBAMMGnJlYWRCYXNp
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xhpcwkkw+bzb6oke5mVK8Okh85C9SaNkQzm3PLlp+GFQZQbs2xeNBV1VGrJ03rUM
whQFZ/yzH2mRIjz3Wz/cLdXBzbPLsFFhqamtCOjKx99WS5Z0iYJFP2RW/+e0iPsb
z3vsBB+rGbtzILMaqIGp0G7ajhBxR8kKtBMvGtcfA2Ys9/apalKhDuqmhMB6aUB9
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pdXItLezN2nig2iQMA8GA1UdEwEB/wQFMAMCAQAwDQYJKoZIhvcNAQELBQADggIB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-----END CERTIFICATE-----`;

const CERT_4 = `-----BEGIN CERTIFICATE-----
MIIFMDCCAxigAwIBAgIUZ70n7eBbkSi2T7MU6vSg9yYbrFUwDQYJKoZIhvcNAQEL
BQAwJTEjMCEGA1UEAwwacmVhZEJhc2ljQ29uc3RyYWludC40LnRlc3QwIBcNMjMw
OTAxMTUxMjA3WhgPMjEyMzA4MDgxNTEyMDdaMCUxIzAhBgNVBAMMGnJlYWRCYXNp
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AgEAzefbTApQ6jRKiJ0hcFyQeJAqwsFoZYRti3h0gpJhdaZOKMJ6F8KbuMmBLy2N
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YOr/iRKlHoZYFj1+rxbAEF/7dCY57CtDWD3upi4mcW8a2HkS2z4bM/nmx/9/BiG5
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9/f/L3Te4VHfspENwOzdh2xXXaZaRkar7+dK1VFqfybyfd6X7SBhtLK7z96CuwhE
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RctIZX+gngAvVfk95h3E5dlWxK42Gg19dXrLzCCz1qxQ78gUv/yAP6nQtZ5cCwr3
6BJn81O2aCKg7zs1jvsovCZzj6VqCeujtOeJHyiiwcux3acCJUji1wVWDWf85KFv
ttW4GI24/8soI7asYBpVFUGGcXWlaK9Kyj+0Rx4VUXLZzvqFH5PUmsnNQqrkqCIW
vghNwzpDs5CyB0YllS72PqiErBnz1FOUTDZBK/SNzhbKh8M02WyzBEp3zGU5YXoD
R4VuZ06LY4pnjq7d51gj7wD9thc8k0JrEdtus39KIFI2Py1hyja7+jqttgt4yuwZ
nPgNSo9ViIrAO7PVmvJ8ikE7Bi9io4fFSA0Jzok+tx9WFpta
-----END CERTIFICATE-----`;

function extractBasicConstraintsExtension(certificate: string | Buffer) {
  certificate = coerceCertificate(certificate);
  const block_info = readTag(certificate, 0);
  const blocks = _readStruct(certificate, block_info);
  const { extensions } = readTbsCertificate(certificate, blocks[0]);
  return extensions?.basicConstraints;
}

describe("Testing basicConstraint field", function (this) {
  it("Should parse if only CA:false is specified", async function () {
    const basicConstraints = extractBasicConstraintsExtension(CERT_1);

    if (basicConstraints) {
      assert(basicConstraints.cA === false);
    }
  });

  it("Should parse if only pathlen:0 is specified", async function () {
    const basicConstraints = extractBasicConstraintsExtension(CERT_2);

    if (basicConstraints) {
      assert(basicConstraints.pathLengthConstraint === 0);
    }
  });

  it("Should parse if both CA:false and pathlen:0 are specified", async function () {
    const basicConstraints = extractBasicConstraintsExtension(CERT_3)

    if (basicConstraints) {
      assert(basicConstraints.cA === false);
      assert(basicConstraints.pathLengthConstraint === 0);
    }
  });

  it("Should parse if both CA:true and pathlen:0 are specified", async function () {
    const basicConstraints = extractBasicConstraintsExtension(CERT_4);

    if (basicConstraints) {
      assert(basicConstraints.cA === true);
      assert(basicConstraints.pathLengthConstraint === 0);
    }
  });
});