jwks-rsa

A library to retrieve RSA signing keys from a JWKS (JSON Web Key Set) endpoint.

npm install --save jwks-rsa

Usage

You'll provide the client with the JWKS endpoint which exposes your signing keys. Using the getSigningKey you can then get the signing key that matches a specific kid.

const jwksClient = require('jwks-rsa');

const client = jwksClient({
  strictSsl: true, // Default value
  jwksUri: 'https://sandrino.auth0.com/.well-known/jwks.json',
  requestHeaders: {}, // Optional
  requestAgentOptions: {}, // Optional
  timeout: 30000, // Defaults to 30s
  proxy: '[protocol]://[username]:[pass]@[address]:[port]', // Optional
});

const kid = 'RkI5MjI5OUY5ODc1N0Q4QzM0OUYzNkVGMTJDOUEzQkFCOTU3NjE2Rg';
client.getSigningKey(kid, (err, key) => {
  const signingKey = key.getPublicKey();

  // Now I can use this to configure my Express or Hapi middleware
});

Note that all methods on the JwksClient have asynchronous equivalents, where the promisified name is suffixed with Async, e.g., client.getSigningKeyAsync(kid).then(key => { /* ... */ });

Integrations are also provided with:

• express/express-jwt

• express/passport-jwt

• hapi/hapi-auth-jwt2

• koa/koa-jwt

Caching

By default, signing key verification results are cached in order to prevent excessive HTTP requests to the JWKS endpoint. If a signing key matching the kid is found, this will be cached and the next time this kid is requested the signing key will be served from the cache. The caching behavior can be configured as seen below:

const jwksClient = require('jwks-rsa');

const client = jwksClient({
  cache: true, // Default Value
  cacheMaxEntries: 5, // Default value
  cacheMaxAge: 600000, // Defaults to 10m
  jwksUri: 'https://sandrino.auth0.com/.well-known/jwks.json'
});

const kid = 'RkI5MjI5OUY5ODc1N0Q4QzM0OUYzNkVGMTJDOUEzQkFCOTU3NjE2Rg';
client.getSigningKey(kid, (err, key) => {
  const signingKey = key.getPublicKey();

  // Now I can use this to configure my Express or Hapi middleware
});

Rate Limiting

Even if caching is enabled the library will call the JWKS endpoint if the kid is not available in the cache, because a key rotation could have taken place. To prevent attackers to send many random kids you can also configure rate limiting. This will allow you to limit the number of calls that are made to the JWKS endpoint per minute (because it would be highly unlikely that signing keys are rotated multiple times per minute).

const jwksClient = require('jwks-rsa');

const client = jwksClient({
  rateLimit: true,
  jwksRequestsPerMinute: 10, // Default value
  jwksUri: 'https://sandrino.auth0.com/.well-known/jwks.json'
});

const kid = 'RkI5MjI5OUY5ODc1N0Q4QzM0OUYzNkVGMTJDOUEzQkFCOTU3NjE2Rg';
client.getSigningKey(kid, (err, key) => {
  const signingKey = key.getPublicKey();

  // Now I can use this to configure my Express or Hapi middleware
});

Using AgentOptions for TLS/SSL Configuration

The requestAgentOptions property can be used to configure SSL/TLS options. An example use case is providing a trusted private (i.e. enterprise/corporate) root certificate authority to establish TLS communication with the jwks_uri.

const jwksClient = require("jwks-rsa");
const client = jwksClient({
  strictSsl: true, // Default value
  jwksUri: 'https://my-enterprise-id-provider/.well-known/jwks.json',
  requestHeaders: {}, // Optional
  requestAgentOptions: {
    ca: fs.readFileSync(caFile)
  }
});

For more information, see the NodeJS request library agentOptions documentation.

Proxy configuration

There are two ways to configure the usage of a proxy:

• Provide the proxy option when initialiting the client as shown above

• Provide the HTTP_PROXY, HTTPS_PROXY and NO_PROXY environment variables

Loading keys from local file, environment variable, or other externals

The getKeysInterceptor property can be used to fetch keys before sending a request to the jwksUri endpoint. This can be helpful when wanting to load keys from a file, env variable, or an external cache. If a KID cannot be found in the keys returned from the interceptor, it will fallback to the jwksUri endpoint. This property will continue to work with the provided LRU cache, if the cache is enabled.

  const client = new JwksClient({ 
    jwksUri: 'https://my-enterprise-id-provider/.well-known/jwks.json',
    getKeysInterceptor: (cb) => {
      const file = fs.readFileSync(jwksFile);
      return cb(null, file.keys);
    }
  });

Running Tests

npm run test

Showing Trace Logs

To show trace logs you can set the following environment variable:

DEBUG=jwks

Output:

jwks Retrieving keys from http://my-authz-server/.well-known/jwks.json +5ms
jwks Keys: +8ms [ { alg: 'RS256',
  kty: 'RSA',
  use: 'sig',
  x5c: [ 'pk1' ],
  kid: 'ABC' },
{ alg: 'RS256', kty: 'RSA', use: 'sig', x5c: [], kid: '123' } ]

License

This project is licensed under the MIT license. See the LICENSE file for more info.