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324 lines
11 KiB
JavaScript
324 lines
11 KiB
JavaScript
export default { enforce };
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import defaultExport from './config.js';
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function log(c, s){
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c.request.error(s)
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}
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function enforce(r) {
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var context = {
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request: r ,
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config : defaultExport["config"],
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backend : (defaultExport.backend ? defaultExport.backend : "@backend")
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}
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log(context, "Inside NJS enforce for " + r.method + " @ " + r.headersIn.host + "/" + r.uri)
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context = computeProtection(context)
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wkf.run(wkf.build(context), context)
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}
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// ######## WORKFLOW FUNCTIONS ###############
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var wkf = {
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build : (context)=>{
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var actions = [
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"export_pep_credentials",
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"parse_authentication",
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"check_authentication",
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"export_authn_token",
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"pip",
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"pdp",
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"export_backend_headers",
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"pass"
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]
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return actions
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},
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run : (actions, context) => {
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context.request.error("Starting workflow with " + njs.dump(actions))
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var w = actions.reduce(
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(acc, f) => { return acc.then(typeof(f) === "function" ? f : wkf[f]) },
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Promise.resolve().then(()=>context)
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)
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w.catch(e => { context.request.error(njs.dump(e)); context.request.return(401)} )
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},
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export_pep_credentials : exportPepCredentials,
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export_authn_token : exportAuthToken,
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export_backend_headers : exportBackendHeaders,
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parse_authentication : parseAuthentication,
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check_authentication : checkAuthentication,
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verify_token : verifyToken,
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request_token : requestToken,
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pip : pipExecutor,
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pdp : pdpExecutor,
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pass : pass,
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//PIP utilities
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"get-path-component" : (c, i) => c.request.uri.split("/")[i],
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"get-token-field" : getTokenField,
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"get-contexts" : (c) => {
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var ra = c.authn.verified_token["resource_access"]
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if(ra){
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var out = [];
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for(var k in ra){
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if(ra[k].roles && ra[k].roles.length !== 0) out.push(k)
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}
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}
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return out;
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}
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}
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function getTokenField(context, f){
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return context.authn.verified_token[f]
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}
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function exportVariable(context, name, value){
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context.request.variables[name] = value
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log(context, "Exported variables:" + njs.dump(context.request.variables))
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return context
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}
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function exportBackendHeaders(context){
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exportVariable(context, "user", context.authn.verified_token.preferred_username)
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exportVariable(context, "user_display", context.authn.verified_token.name)
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return context
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}
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function exportPepCredentials(context){
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if(!context.config["pep-credentials"]){
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throw new Error("Need PEP credentials")
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}
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return exportVariable(context, "pep_credentials", "Basic " + context.config["pep-credentials"])
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}
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function exportAuthToken(context){
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return exportVariable(context, "auth_token", context.authn.token)
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}
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function checkAuthentication(context){
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return context.authn.type === "bearer" ? wkf.verify_token(context) : wkf.request_token(context)
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}
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function parseAuthentication(context){
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context.request.log("Inside parseAuthentication")
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var incomingauth = context.request.headersIn["Authorization"]
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if(!incomingauth) throw new Error("Authentication required");
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var arr = incomingauth.trim().replace(/\s\s+/g, " ").split(" ")
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if(arr.length != 2) throw new Error("Unknown authentication scheme");
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var type = arr[0].toLowerCase()
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if(type === "basic" && context.authz.host && context.authz.host["allow-basic-auth"]){
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var unamepass = Buffer.from(arr[1], 'base64').toString().split(":")
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if(unamepass.length != 2) return null;
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context.authn = { type : type, raw : arr[1], user : unamepass[0], password : unamepass[1]}
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return context
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}else if(type === "bearer"){
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context.authn = { type : type, raw : arr[1], token : arr[1]}
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return context
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}
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throw new Error("Unknown authentication scheme");
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}
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function verifyToken(context){
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log(context, "Inside verifyToken")
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log(context, "Token is " + context.authn.token)
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var options = {
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"body" : "token=" + context.authn.token + "&token_type_hint=access_token"
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}
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return context.request.subrequest("/jwt_verify_request", options)
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.then(reply=>{
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if (reply.status === 200) {
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var response = JSON.parse(reply.responseBody);
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if (response.active === true) {
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return response
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} else {
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throw new Error("Unauthorized: " + reply.responseBody)
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}
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} else {
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throw new Error("Unauthorized: " + reply.responseBody)
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}
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}).then(verified_token => {
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context.authn.verified_token =
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JSON.parse(Buffer.from(context.authn.token.split('.')[1], 'base64url').toString())
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return context
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})
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}
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function requestToken(context){
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log(context, "Inside requestToken")
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var options = {
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"body" : "grant_type=password&username="+context.authn.user+"&password="+context.authn.password
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}
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return context.request.subrequest("/jwt_request", options)
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.then(reply=>{
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if (reply.status === 200) {
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var response = JSON.parse(reply.responseBody);
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context.authn.token = response.access_token
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context.authn.verified_token =
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JSON.parse(Buffer.from(context.authn.token.split('.')[1], 'base64url').toString())
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return context
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} else if (reply.status === 400 || reply.status === 401){
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var options = {
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"body" : "grant_type=password&username="+context.authn.user+"&password="+context.authn.password
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}
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return context.request.subrequest("/jwt_request", options)
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.then( reply=>{
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if (reply.status === 200) {
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var response = JSON.parse(reply.responseBody);
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context.authn.token = response.access_token
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context.authn.verified_token =
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JSON.parse(Buffer.from(context.authn.token.split('.')[1], 'base64url').toString())
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return context
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} else{
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throw new Error("Unauthorized " + reply.status)
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}
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})
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} else {
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throw new Error("Unauthorized " + reply.status)
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}
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})
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}
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function pipExecutor(context){
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log(context, "Inside extra claims PIP")
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context.authz.pip.forEach(extra =>{
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//call extra claim pip function
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try{
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var operator = extra.operator
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var result = wkf[operator](context, extra.args)
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//ensure array and add to extra_claims
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if(!(result instanceof Array)) result = [result]
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if(!context.extra_claims) context.extra_claims = {};
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context.extra_claims[extra.claim] = result
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} catch (error){
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log(context, "Skipping invalid extra claim " + njs.dump(error))
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}
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})
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log(context, "Extra claims are " + njs.dump(context.extra_claims))
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return context
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}
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function pdpExecutor(context){
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log(context, "Inside PDP")
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return context.authz.pdp(context)
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}
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function umaCall(context){
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log(context, "Inside UMA call")
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var options = { "body" : computePermissionRequestBody(context) };
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return context.request.subrequest("/permission_request", options)
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.then(reply =>{
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if(reply.status === 200){
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return context
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}else{
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throw new Error("Response for authorization request is not ok " + reply.status + " " + njs.dump(reply.responseBody))
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}
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})
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}
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function pass(context){
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log(context, "Inside pass");
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if(typeof(context.backend) === "string") context.request.internalRedirect(context.backend);
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else if (typeof(context.backend) === "function") context.request.internalRedirect(context.backend(context))
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return context;
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}
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// ######## AUTHORIZATION PART ###############
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function computePermissionRequestBody(context){
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if(!context.authz.host || !context.authz.path ){
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throw new Error("Enforcemnt mode is always enforcing. Host or path not found...")
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}
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var audience = computeAudience(context)
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var grant = "grant_type=urn:ietf:params:oauth:grant-type:uma-ticket"
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var mode = "response_mode=decision"
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var permissions = computePermissions(context)
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var extra = ""
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if(context.extra_claims){
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extra =
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"claim_token_format=urn:ietf:params:oauth:token-type:jwt&claim_token=" +
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JSON.stringify(context.extra_claims).toString("base64url")
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}
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var body = audience + "&" + grant + "&" + permissions + "&" + mode + "&" + extra
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context.request.error("Computed permission request body is " + body)
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return body
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}
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function computeAudience(context){
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var aud = context.request.headersIn.host
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if(context.authz.host){
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aud = context.authz.host.audience||context.authz.host.host
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}
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return "audience=" + aud
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}
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function computePermissions(context){
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var resource = context.request.uri
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if(context.authz.path){
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resource = context.authz.path.name||context.authz.path.path
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}
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var scopes = []
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if(context.authz.method && context.authz.method.scopes){
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scopes = context.authz.method.scopes
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}
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if(scopes.length > 0){
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return scopes.map(s=>"permission=" + resource + "#" + s).join("&")
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}
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return "permission=" + resource
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}
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function getPath(hostconfig, incomingpath, incomingmethod){
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var paths = hostconfig.paths || []
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var matchingpaths = paths
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.filter(p => {return incomingpath.match(p.path) != null})
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.reduce((acc, p) => {
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if (!p.methods || p.methods.length === 0) acc.weak.push({ path: p});
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else{
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var matchingmethods = p.methods.filter(m=>m.method.toUpperCase() === incomingmethod)
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if(matchingmethods.length > 0) acc.strong.push({ method : matchingmethods[0], path: p});
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}
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return acc;
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}, { strong: [], weak: []})
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return matchingpaths.strong.concat(matchingpaths.weak)[0]
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}
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function getHost(config, host){
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var matching = config.hosts.filter(h=>{
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return h.host === host
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})
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return matching.length > 0 ? matching[0] : null
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}
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function computeProtection(context){
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log(context, "Getting by host " + context.request.headersIn.host)
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context.authz = {}
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context.authz.host = getHost(context.config, context.request.headersIn.host)
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if(context.authz.host !== null){
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log(context, "Host found:" + context.authz.host)
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context.authz.pip = context.authz.host.pip ? context.authz.host.pip : [];
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context.authz.pdp = context.authz.host.pdp ? context.authz.host.pdp : umaCall;
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var pathandmethod = getPath(context.authz.host, context.request.uri, context.request.method);
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if(pathandmethod){
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context.authz.path = pathandmethod.path;
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context.authz.pip = context.authz.path.pip ? context.authz.pip.concat(context.authz.path.pip) : context.authz.pip;
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context.authz.pdp = context.authz.path.pdp ? context.authz.path.pdp : context.authz.pdp;
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context.authz.method = pathandmethod.method;
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if(context.authz.method){
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context.authz.pip = context.authz.method.pip ? context.authz.pip.concat(context.authz.method.pip) : context.authz.pip;
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context.authz.pdp = context.authz.method.pdp ? context.authz.method.pdp : context.authz.pdp;
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}
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}
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}
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log(context, "Leaving protection computation: ")
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return context
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}
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