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keycloak-lambda-authorizer

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Readme

Description

Implementation Keycloak adapter for aws Lambda

Features

validate expiration of JWT token
validate JWS signature
supports "clientId/secret" and "client-jwt" credential types
Role based authorization
Resource based authorization ( Keycloak Authorization Services )

Installation

npm install keycloak-lambda-authorizer -S

Examples

Serverless example (Api gateway with lambda authorizer)

How to use with Aws Lambda Authorizer :

Role Based

import { awsHandler } from 'keycloak-lambda-authorizer';
 
export function authorizer(event, context, callback) {
    const keycloakJSON = ...; // read Keycloak.json
  awsHandler(event, keycloakJSON, {
    enforce: { enabled: true, role: 'SOME_ROLE' },
  }).then((token)=>{
      // Success 
  }).catch((e)=>{
    // Failed
  });
}

Resource Based (Keycloak Authorization Services)

import { awsHandler } from 'keycloak-lambda-authorizer';
 
export function authorizer(event, context, callback) {
    const keycloakJSON = ...; // read Keycloak.json
  awsHandler(event, keycloakJSON, {
    enforce: {
      enabled: true,
      resource: {
        name: 'SOME_RESOURCE',
        uri: 'RESOURCE_URI',
        matchingUri: true,
      },
    },
  }).then((token)=>{
      // Success 
  }).catch((e)=>{
    // Failed
  });
}

Configuration

Option structure:

{
   "cache":"defaultCache",
   "logger":console,
   "keys":{
      "privateKey":{
        "key": privateKey,
        "passphrase": 'privateKey passphrase'
      },
      "publicKey":{
        "key": publicKey,
      }
    },
   "enforce":{
      "enabled":true,
      "resource":{
         "name":"SOME_RESOURCE",
         "uri":"/test",
         "owner":"...",
         "type":"...",
         "scope":"...",
         "matchingUri":false,
         "deep":false
      },
      "resources":[
         {
            "name":"SOME_RESOURCE1",
            "uri":"/test1",
            "owner":"...",
            "type":"...",
            "scope":"...",
            "matchingUri":false,
            "deep":false
         },
         {
            "name":"SOME_RESOURCE2",
            "uri":"/test2",
            "owner":"...",
            "type":"...",
            "scope":"...",
            "matchingUri":false,
            "deep":false
         }
      ]
   }
}
}

Resource Structure:

{
   "name":"",
   "uri":"",
   "owner":"",
   "type":"",
   "scope":"",
   "matchingUri":false
}

name : unique name of resource
uri : URIs which are protected by resource.
Owner : Owner of resource
type : Type of Resource
scope : The scope associated with this resource.
matchingUri : matching Uri

Keycloak Admin Console 2020-04-11 23-58-06

Change logger

awsHandler(event, keycloakJSON, {
      logger:winston,
      ...
  }).then().catch()

const winston from 'winston';
import { awsHandler } from 'keycloak-lambda-authorizer';
 
export function authorizer(event, context, callback) {
    const keycloakJSON = ...; // read Keycloak.json
  awsHandler(event, keycloakJSON, {
      logger:winston
  }).then((token)=>{
      // Success 
  }).catch((e)=>{
    // Failed
  });
}

Cache

Example of cache:

const NodeCache = require('node-cache');

const defaultCache = new NodeCache({ stdTTL: 180, checkperiod: 0, errorOnMissing: false });
const resourceCache = new NodeCache({ stdTTL: 30, checkperiod: 0, errorOnMissing: false });

export function put(region, key, value) {
  if (region === 'publicKey') {
    defaultCache.set(key, value);
  } else if (region === 'uma2-configuration') {
    defaultCache.set(key, value);
  } else if (region === 'client_credentials') {
    defaultCache.set(key, value);
  } else if (region === 'resource') {
    resourceCache.set(key, value);
  } else {
    throw new Error('Unsupported Region');
  }
}

export function get(region, key) {
  if (region === 'publicKey') {
    return defaultCache.get(key);
  } if (region === 'uma2-configuration') {
    return defaultCache.get(key);
  } if (region === 'client_credentials') {
    return defaultCache.get(key);
  } if (region === 'resource') {
    return resourceCache.get(key);
  }
  throw new Error('Unsupported Region');
}

Cache Regions:

publicKey - Cache for storing Public Keys. (The time to live - 180 sec)
uma2-configuration - uma2-configuration link. example of link http://localhost:8090/auth/realms/lambda-authorizer/.well-known/uma2-configuration (The time to live - 180 sec)
client_credentials - Service Accounts Credential Cache (The time to live - 180 sec). resource - Resources Cache (The time to live - 30 sec).

Change Cache:

import { awsHandler } from 'keycloak-lambda-authorizer';
 
export function authorizer(event, context, callback) {
    const keycloakJSON = ...; // read Keycloak.json
  awsHandler(event, keycloakJSON, {
      cache: newCache,
  }).then((token)=>{
      // Success 
  }).catch((e)=>{
    // Failed
  });
}

Client Jwt Credential Type

- RSA Keys Structure

{
   "privateKey":{
      "key":"privateKey",
      "passphrase":"privateKey passphrase"
   },
   "publicKey":{
      "key":"publicKey"
   }
}

privateKey.key - RSA Private Key privateKey.passphrase - word or phrase that protects private key publicKey.key - RSA Public Key or Certificate

RSA keys generation example using openssl

openssl req -new -newkey rsa:2048 -days 365 -nodes -x509 -subj "/C=US/ST=Denial/L=Springfield/O=Dis/CN=lambda-jwks" -keyout server.key -out server.crt

Create JWKS endpoint by AWS API Gateway

serverless.yaml

functions:
  cert:
    handler: handler.cert
    events:
      - http:
          path: cert
          method: GET

lambda function (handler.cert)

import { jwksUrl } from 'keycloak-lambda-authorizer';

export function cert(event, context, callback) {
  const jwksResponse = jwksUrl(publicKey);
  callback(null, {
    statusCode: 200,
    body: jwksResponse,
  });
}

Keycloak Settings

Create Api GateWay Authorizer function

import { awsHandler } from 'keycloak-lambda-authorizer';
 
export function authorizer(event, context, callback) {
    const keycloakJSON = ...; // read Keycloak.json
  awsHandler(event, keycloakJSON, {
    keys:{
      privateKey:{
        key: privateKey,
      },
      publicKey:{
        key: publicKey,
      }
    },
    enforce: {
      enabled: true,
      resource: {
        name: 'SOME_RESOURCE',
        uri: 'RESOURCE_URI',
        matchingUri: true,
      },
    },
  }).then((token)=>{
      // Success 
  }).catch((e)=>{
    // Failed
  });
}