CSRF Token not updated properly (Ionic + Spring Security) - ionic-framework

I'm developing an app using Ionic Framework and generated a JHipster project for my backend. My JHipster project runs on an extra Server and is called via REST requests from my App. So my problem now is handling the CORS and CSRF configuration.
My JHipster project has its own frontend, which runs on the same domain and while testing I can reach my backend without any issues. However, when I want to call my backend on the server from my Ionic app my xsrf tokens wont update properly and, therefore, I cannot access my backend. I already tried several solutions from different stack overflow posts, but none of them worked for me.
For example:
Ionic using CORS and CSRF
Could not verify token
https://github.com/angular/angular/issues/18859
What I've done so far:
I enabled csrf in my SecurityConfiguration in my JHipster project
http
.csrf()
.csrfTokenRepository(CookieCsrfTokenRepository.withHttpOnlyFalse())
.and()
.addFilterBefore(corsFilter, UsernamePasswordAuthenticationFilter.class)
.exceptionHandling()
.authenticationEntryPoint(problemSupport)
.accessDeniedHandler(problemSupport)
added CORS configuration
cors:
allowed-origins: 'http://localhost:8100, ionic://localhost, http://localhost'
allowed-methods: 'POST, GET, OPTIONS, DELETE, PUT, HEAD'
allowed-headers: 'Origin, X-Requested-With, Content-Type, Accept, x-auth-token, Authorization, X-CSRF-Token, x-xsrf-token, XSRF-TOKEN'
exposed-headers: 'Authorization,Link,X-Total-Count,XSRF-TOKEN, X-XSRF-TOKEN'
allow-credentials: true
max-age: 86400
wrote an interceptor
#Injectable()
export class HttpXSRFInterceptor implements HttpInterceptor {
constructor(private tokenExtractor: HttpXsrfTokenExtractor, private csrfService:CSRFService, private $sessionStorage: SessionStorageService) {
}
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
const headerName = 'XSRF-TOKEN';
const respHeaderName = 'X-XSRF-TOKEN';
let token = this.tokenExtractor.getToken() as string;
if (token !== null && !req.headers.has(headerName)) {
req = req.clone({ headers: req.headers.set(respHeaderName, token) });
req.clone({
withCredentials: true
});
}
return next.handle(req);
}
}
added HttpClientXsrfModule in my app.module.ts and the interceptor
HttpClientXsrfModule.withOptions({
cookieName: 'XSRF-TOKEN',
headerName: 'X-XSRF-TOKEN',
}),
{
provide: HTTP_INTERCEPTORS,
useClass: HttpXSRFInterceptor,
multi: true
},
My Problem:
I dont get a xsrf token when starting my App in the browser, but after I send a post request the token gets set as a cookie.
For example when logging in, the first attempt fails due to the missing token, but the second login request is successful because now the response header for the xsrf token is not null anymore. Furthermore, the token does not update itself even though the server response has a new token in its header.
From my understanding
the first time I get my token should be immediately after loading the start page of my app
the token should be updated after each response from the server (backend) and the updated token is used for the next request
Therefore my problem is that both these issues do not happen and I don't know how to fix it.
I appreciate any help!
cheers

I'm the author of Ionic for JHipster so hopefully, I can help you with this.
First of all, CSRF shouldn't be an issue unless you're running your apps on the same port. In my experience, when you run them on separate ports, your client can't read the cookie. As for CORS, that's not a problem for me when running locally. I believe it's because the CORS settings for the dev profile are wide open. Can you try using the settings from the dev profile in your prod profile and see if it helps?
For reference, they are:
jhipster:
cors:
allowed-origins: '*'
allowed-methods: '*'
allowed-headers: '*'
exposed-headers: 'Authorization,Link,X-Total-Count'
allow-credentials: true
max-age: 1800
If this works, I'd try changing your allowed origins to an array, or just use one. http://localhost:8100 should be all you need if running locally.

Related

Keycloak : Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource [duplicate]

I'm trying to fetch some data from the REST API of HP Alm. It works pretty well with a small curl script—I get my data.
Now doing that with JavaScript, fetch and ES6 (more or less) seems to be a bigger issue. I keep getting this error message:
Fetch API cannot load . Response to preflight request doesn't
pass access control check: No 'Access-Control-Allow-Origin' header is
present on the requested resource. Origin 'http://127.0.0.1:3000' is
therefore not allowed access. The response had HTTP status code 501.
If an opaque response serves your needs, set the request's mode to
'no-cors' to fetch the resource with CORS disabled.
I understand that this is because I am trying to fetch that data from within my localhost and the solution should be using Cross-Origin Resource Sharing (CORS). I thought I actually did that, but somehow it either ignores what I write in the header or the problem is something else.
So, is there an implementation issue? Am I doing it wrong? I can't check the server logs unfortunately. I'm really a bit stuck here.
function performSignIn() {
let headers = new Headers();
headers.append('Content-Type', 'application/json');
headers.append('Accept', 'application/json');
headers.append('Access-Control-Allow-Origin', 'http://localhost:3000');
headers.append('Access-Control-Allow-Credentials', 'true');
headers.append('GET', 'POST', 'OPTIONS');
headers.append('Authorization', 'Basic ' + base64.encode(username + ":" + password));
fetch(sign_in, {
//mode: 'no-cors',
credentials: 'include',
method: 'POST',
headers: headers
})
.then(response => response.json())
.then(json => console.log(json))
.catch(error => console.log('Authorization failed : ' + error.message));
}
I am using Chrome. I also tried using that Chrome CORS Plugin, but then I am getting another error message:
The value of the 'Access-Control-Allow-Origin' header in the response
must not be the wildcard '*' when the request's credentials mode is
'include'. Origin 'http://127.0.0.1:3000' is therefore not allowed
access. The credentials mode of requests initiated by the
XMLHttpRequest is controlled by the withCredentials attribute.
This answer covers a lot of ground, so it’s divided into three parts:
How to use a CORS proxy to avoid “No Access-Control-Allow-Origin header” problems
How to avoid the CORS preflight
How to fix “Access-Control-Allow-Origin header must not be the wildcard” problems
How to use a CORS proxy to avoid “No Access-Control-Allow-Origin header” problems
If you don’t control the server your frontend code is sending a request to, and the problem with the response from that server is just the lack of the necessary Access-Control-Allow-Origin header, you can still get things to work—by making the request through a CORS proxy.
You can easily run your own proxy with code from https://github.com/Rob--W/cors-anywhere/.
You can also easily deploy your own proxy to Heroku in just 2-3 minutes, with 5 commands:
git clone https://github.com/Rob--W/cors-anywhere.git
cd cors-anywhere/
npm install
heroku create
git push heroku master
After running those commands, you’ll end up with your own CORS Anywhere server running at, e.g., https://cryptic-headland-94862.herokuapp.com/.
Now, prefix your request URL with the URL for your proxy:
https://cryptic-headland-94862.herokuapp.com/https://example.com
Adding the proxy URL as a prefix causes the request to get made through your proxy, which:
Forwards the request to https://example.com.
Receives the response from https://example.com.
Adds the Access-Control-Allow-Origin header to the response.
Passes that response, with that added header, back to the requesting frontend code.
The browser then allows the frontend code to access the response, because that response with the Access-Control-Allow-Origin response header is what the browser sees.
This works even if the request is one that triggers browsers to do a CORS preflight OPTIONS request, because in that case, the proxy also sends the Access-Control-Allow-Headers and Access-Control-Allow-Methods headers needed to make the preflight succeed.
How to avoid the CORS preflight
The code in the question triggers a CORS preflight—since it sends an Authorization header.
https://developer.mozilla.org/docs/Web/HTTP/Access_control_CORS#Preflighted_requests
Even without that, the Content-Type: application/json header will also trigger a preflight.
What “preflight” means: before the browser tries the POST in the code in the question, it first sends an OPTIONS request to the server, to determine if the server is opting-in to receiving a cross-origin POST that has Authorization and Content-Type: application/json headers.
It works pretty well with a small curl script - I get my data.
To properly test with curl, you must emulate the preflight OPTIONS the browser sends:
curl -i -X OPTIONS -H "Origin: http://127.0.0.1:3000" \
-H 'Access-Control-Request-Method: POST' \
-H 'Access-Control-Request-Headers: Content-Type, Authorization' \
"https://the.sign_in.url"
…with https://the.sign_in.url replaced by whatever your actual sign_in URL is.
The response the browser needs from that OPTIONS request must have headers like this:
Access-Control-Allow-Origin: http://127.0.0.1:3000
Access-Control-Allow-Methods: POST
Access-Control-Allow-Headers: Content-Type, Authorization
If the OPTIONS response doesn’t include those headers, the browser will stop right there and never attempt to send the POST request. Also, the HTTP status code for the response must be a 2xx—typically 200 or 204. If it’s any other status code, the browser will stop right there.
The server in the question responds to the OPTIONS request with a 501 status code, which apparently means it’s trying to indicate it doesn’t implement support for OPTIONS requests. Other servers typically respond with a 405 “Method not allowed” status code in this case.
So you’ll never be able to make POST requests directly to that server from your frontend JavaScript code if the server responds to that OPTIONS request with a 405 or 501 or anything other than a 200 or 204 or if doesn’t respond with those necessary response headers.
The way to avoid triggering a preflight for the case in the question would be:
if the server didn’t require an Authorization request header but instead, e.g., relied on authentication data embedded in the body of the POST request or as a query param
if the server didn’t require the POST body to have a Content-Type: application/json media type but instead accepted the POST body as application/x-www-form-urlencoded with a parameter named json (or whatever) whose value is the JSON data
How to fix “Access-Control-Allow-Origin header must not be the wildcard” problems
I am getting another error message:
The value of the 'Access-Control-Allow-Origin' header in the response
must not be the wildcard '*' when the request's credentials mode is
'include'. Origin 'http://127.0.0.1:3000' is therefore not allowed
access. The credentials mode of requests initiated by the
XMLHttpRequest is controlled by the withCredentials attribute.
For requests that have credentials, browsers won’t let your frontend JavaScript code access the response if the value of the Access-Control-Allow-Origin header is *. Instead the value in that case must exactly match your frontend code’s origin, http://127.0.0.1:3000.
See Credentialed requests and wildcards in the MDN HTTP access control (CORS) article.
If you control the server you’re sending the request to, a common way to deal with this case is to configure the server to take the value of the Origin request header, and echo/reflect that back into the value of the Access-Control-Allow-Origin response header; e.g., with nginx:
add_header Access-Control-Allow-Origin $http_origin
But that’s just an example; other (web) server systems have similar ways to echo origin values.
I am using Chrome. I also tried using that Chrome CORS Plugin
That Chrome CORS plugin apparently just simplemindedly injects an Access-Control-Allow-Origin: * header into the response the browser sees. If the plugin were smarter, what it would be doing is setting the value of that fake Access-Control-Allow-Origin response header to the actual origin of your frontend JavaScript code, http://127.0.0.1:3000.
So avoid using that plugin, even for testing. It’s just a distraction. To test what responses you get from the server with no browser filtering them, you’re better off using curl -H as above.
As far as the frontend JavaScript code for the fetch(…) request in the question:
headers.append('Access-Control-Allow-Origin', 'http://localhost:3000');
headers.append('Access-Control-Allow-Credentials', 'true');
Remove those lines. The Access-Control-Allow-* headers are response headers. You never want to send them in requests. The only effect of that is to trigger a browser to do a preflight.
This error occurs when the client URL and server URL don't match, including the port number. In this case you need to enable your service for CORS which is cross origin resource sharing.
If you are hosting a Spring REST service then you can find it in the blog post CORS support in Spring Framework.
If you are hosting service using a Node.js server then
Stop the Node.js server.
npm install cors --save
Add following lines to your server.js
const cors=require("cors");
const corsOptions ={
origin:'*',
credentials:true, //access-control-allow-credentials:true
optionSuccessStatus:200,
}
app.use(cors(corsOptions)) // Use this after the variable declaration
The problem arose because you added the following code as the request header in your front-end:
headers.append('Access-Control-Allow-Origin', 'http://localhost:3000');
headers.append('Access-Control-Allow-Credentials', 'true');
Those headers belong to the response, not request. So remove them, including the line:
headers.append('GET', 'POST', 'OPTIONS');
Your request had 'Content-Type: application/json', hence triggered what is called CORS preflight. This caused the browser sent the request with the OPTIONS method. See CORS preflight for detailed information.
Therefore in your back-end, you have to handle this preflighted request by returning the response headers which include:
Access-Control-Allow-Origin : http://localhost:3000
Access-Control-Allow-Credentials : true
Access-Control-Allow-Methods : GET, POST, OPTIONS
Access-Control-Allow-Headers : Origin, Content-Type, Accept
Of course, the actual syntax depends on the programming language you use for your back-end.
In your front-end, it should be like so:
function performSignIn() {
let headers = new Headers();
headers.append('Content-Type', 'application/json');
headers.append('Accept', 'application/json');
headers.append('Authorization', 'Basic ' + base64.encode(username + ":" + password));
headers.append('Origin','http://localhost:3000');
fetch(sign_in, {
mode: 'cors',
credentials: 'include',
method: 'POST',
headers: headers
})
.then(response => response.json())
.then(json => console.log(json))
.catch(error => console.log('Authorization failed: ' + error.message));
}
In my case, I use the below solution.
Front-end or Angular
post(
this.serverUrl, dataObjToPost,
{
headers: new HttpHeaders({
'Content-Type': 'application/json',
})
}
)
back-end (I use PHP)
header("Access-Control-Allow-Origin: http://localhost:4200");
header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
header("Access-Control-Allow-Headers: Content-Type, Authorization");
$postdata = file_get_contents("php://input");
$request = json_decode($postdata);
print_r($request);
Using dataType: 'jsonp' worked for me.
async function get_ajax_data(){
var _reprojected_lat_lng = await $.ajax({
type: 'GET',
dataType: 'jsonp',
data: {},
url: _reprojection_url,
error: function (jqXHR, textStatus, errorThrown) {
console.log(jqXHR)
},
success: function (data) {
console.log(data);
// note: data is already json type, you
// just specify dataType: jsonp
return data;
}
});
} // function
Just my two cents... regarding How to use a CORS proxy to get around “No Access-Control-Allow-Origin header” problems
For those of you working with php at the backend, deploying a "CORS proxy" is as simple as:
create a file named 'no-cors.php' with the following content:
$URL = $_GET['url'];
echo json_encode(file_get_contents($URL));
die();
on your front end, do something like:
fetch('https://example.com/no-cors.php' + '?url=' + url)
.then(response=>{*/Handle Response/*})`
If your API is written in ASP.NET Core, then please follow the below steps:
Install the Microsoft.AspNetCore.Cors package.
Add the below line in the ConfigureServices method in file Startup.cs:
services.AddCors();
Add the below line in the Configure method in file startup.cs:
app.UseCors(options =>
options.WithOrigins("http://localhost:8080")
.AllowAnyHeader()
.AllowAnyMethod());
Make sure you add this after - app.UseRouting();
Refer to the below image(from MSDN) to see the middleware order:
https://i.stack.imgur.com/vQ4yT.png
Possible causes of CORS issues
Check your server-side access headers: Refer to this link
Check what request header is received from the server in the browser. The below image shows the headers
If you are using the fetch method and trying to access the cross-origin request make sure mode:cors is there. Refer to this link
Sometimes if there is an issue in the program also you are getting the CORS issue, so make sure your code is working properly.
Make sure to handle the OPTION method in your API.
Adding mode:no-cors can avoid CORS issues in the API.
fetch(sign_in, {
mode: 'no-cors',
credentials: 'include',
method: 'POST',
headers: headers
})
.then(response => response.json())
.then(json => console.log(json))
.catch(error => console.log('Authorization failed : ' + error.message));
}
In December 2021, Chrome 97, the Authorization: Bearer ... is not allowed unless it is in the Access-Control-Allow-Headers preflight response (ignores *). It produced this warning:
[Deprecation] authorization will not be covered by the wildcard symbol (*)
See: Chrome Enterprise release notes, Chrome 97
It also appears to enforce the same restriction on * on Access-Control-Allow-Origin. If you want to revive *-like behavior now that it is blocked, you'll likely have to read the requester's origin and return it as the allowed origin in the preflight response.
In some cases, a library may drop the Access-Control-Allow-Origin response header when there is some other invalid credential (example: an expired JWT). Then, the browser shows the "No 'Access-Control-Allow-Origin' header is present" error instead of the actual error (which in this example could be an expired JWT). Be sure that your library doesn't drop the header and confuse the client.
Faced this issue in my react/express app. Adding the below code in server.js (or your server file name) fixed the issue for me. Install cors and then
const cors = require('cors');
app.use(cors({
origin: 'http://example.com', // use your actual domain name (or localhost), using * is not recommended
methods: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'HEAD', 'OPTIONS'],
allowedHeaders: ['Content-Type', 'Origin', 'X-Requested-With', 'Accept', 'x-client-key', 'x-client-token', 'x-client-secret', 'Authorization'],
credentials: true
}))
Now you can make straightforward API calls from your front-end without having to pass any additional parameters.
With Node.js, if you are using routers, make sure to add CORS before the routers. Otherwise, you'll still get the CORS error. Like below:
const cors = require('cors');
const userRouter = require('./routers/user');
expressApp = express();
expressApp.use(cors());
expressApp.use(express.json());
expressApp.use(userRouter);
In case you are using Node.js and Express.js as the back-end and React & Axios as the front-end within a development environment in macOS, you need to run both sides under HTTPS. Below is what finally worked for me (after many hours of deep dive and testing):
Step 1: Create an SSL certificate
Just follow the steps from How to get HTTPS working on your local development environment in 5 minutes.
You will end up with a couple of files to be used as credentials to run the HTTPS server and React web:
server.key & server.crt
You need to copy them in the root folders of both the front and back ends (in a production environment, you might consider copying them in folder ./ssh for the back-end).
Step 2: Back-end setup
I read a lot of answers proposing the use of 'cors' package or even setting ('Access-Control-Allow-Origin', '*'), which is like saying: "Hackers are welcome to my website". Just do like this:
import express from 'express';
const emailRouter = require('./routes/email'); // in my case, I was sending an email through a form in React
const fs = require('fs');
const https = require('https');
const app = express();
const port = 8000;
// CORS (Cross-Origin Resource Sharing) headers to support Cross-site HTTP requests
app.all('*', (req, res, next) => {
res.header("Access-Control-Allow-Origin", "https://localhost:3000");
next();
});
// Routes definition
app.use('/email', emailRouter);
// HTTPS server
const credentials = {
key: fs.readFileSync('server.key'),
cert: fs.readFileSync('server.crt')
};
const httpsServer = https.createServer(credentials, app);
httpsServer.listen(port, () => {
console.log(`Back-end running on port ${port}`);
});
In case you want to test if the https is OK, you can replace the httpsServer constant by the one below:
https.createServer(credentials, (req: any, res: any) => {
res.writeHead(200);
res.end("hello world from SSL\n");
}).listen(port, () => {
console.log(`HTTPS server listening on port ${port}...`);
});
And then access it from a web browser: https://localhost:8000/
Step 3: Front-end setup
This is the Axios request from the React front-end:
await axios.get(`https://localhost:8000/email/send`, {
params: { /* Whatever data you want to send */ },
headers: {
'Content-Type': 'application/json',
}
})
And now, you need to launch your React web in HTTPS mode using the credentials for SSL we already created. Type this in your macOS terminal:
HTTPS=true SSL_CRT_FILE=server.crt SSL_KEY_FILE=server.key npm start
At this point, you are sending a request from an HTTPS connection at port 3000 from your front-end, to be received by an HTTPS connection at port 8000 by your back-end. CORS should be happy with this ;)
For those using ASP.NET Core:
In my case, I was using JavaScript to make a blob from an image stored on the API (the server), so the URL was pointing to that resource. In that API's program.cs class, I already had a CORS policy, but it didn't work.
After I read the Microsoft documentation (read the first paragraph) about this issue, it is said that if you want to access a resource on the server, by using JavaScript (which is what I was trying to do), then you must call the app.UseCors(); before the app.UseStaticFiles(); which is typically the opposite.
My program.cs file:
const string corsPolicyName = "ApiCORS";
builder.Services.AddCors(options =>
{
options.AddPolicy(corsPolicyName, policy =>
{
policy.WithOrigins("https://localhost:7212");
});
});
...
var app = builder.Build();
app.UseSwagger();
app.UseSwaggerUI(settings =>
{
settings.DisplayRequestDuration();
settings.EnableTryItOutByDefault();
});
app.UseHttpsRedirection();
app.UseCors(corsPolicyName); // 👈 This should be above the UseStaticFiles();
app.UseStaticFiles(); // 👈 Below the UseCors();
app.UseAuthentication();
app.UseAuthorization();
app.UseApiCustomExceptionHandler();
app.MapControllers();
app.Run();
Remove this:
credentials: 'include',
For a Node.js and Express.js backend I use this :)
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "YOUR-DOMAIN.TLD"); // Update to match the domain you will make the request from
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
next();
});
For more details: CORS on ExpressJS
I have encountered this error several times over the past few years -- seemingly showing up out of the blue in a previously functioning website.
I determined that Chrome (and possibly other browsers) can return this error when there is some unrelated error that occurs on the server that prevents it from processing the CORS request (and prior to returning an HTTP 500 error).
These all occurred in a .NET Core environment, and I am not sure if it would happen in other environments.
Anyway, if your code has functioned before, and seems correct, consider debugging to find if there is some other error that is firing before you go crazy trying to solve an error that isn't really there.
In my case, the web server prevented the "OPTIONS" method
Check your web server for the options method
Apache: https://www-01.ibm.com/support/docview.wss?uid=ibm10735209
web tier: 4.4.6 Disabling the Options Method https://docs.oracle.com/cd/E23943_01/web.1111/e10144/getstart.htm#HSADM174
nginx: https://medium.com/#hariomvashisth/cors-on-nginx-be38dd0e19df
I'm using "webtier"
/www/webtier/domains/[domainname]/config/fmwconfig/components/OHS/VCWeb1/httpd.conf
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_METHOD} ^OPTIONS
RewriteRule .* . [F]
</IfModule>
change to
<IfModule mod_rewrite.c>
RewriteEngine off
RewriteCond %{REQUEST_METHOD} ^OPTIONS
RewriteRule .* . [F]
</IfModule>
In my case, the solution was dumb as hell... Your allowed origin shouldn't have a slash at the end.
E.g., https://example.com/ -> https://example.com
In my case, I had to add a custom header middleware below all the existing middleware. I think some middleware might conflict with the Access-Control-Allow-Origin Header and try to set it according to their needs.
So the code would be something like this:
app.use(cors());
....all other middleware here
app.use(function (req, res, next) {
res.header("Access-Control-Allow-Origin", "http://localhost:3000");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
next();
});
...your routes
I make this mistake a lot of times, and because of it, I've made a "check-list" to all of you.
Enable CORS on your project: If you're using Node.js (by example) you can use:
npm install cors;
import cors from 'cors';
app.use(cors());
You can manually set the headers like this (if you want it):
app.use((req, res, next) => {
res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept, Authortization');
res.setHeader('Acces-Control-Allow-Methods', 'GET, POST, PATCH, DELETE');
Remember to add http:// to your API link in your frontend project, some browsers like Chrome do not accept a request using CORS if the request URL isn't HTTP or HTTPS:
http://localhost:3000/api
Check if your project is using a proxy.config.js file. See Fixing CORS errors with Angular CLI proxy.
When the client used to call our backend service from his host username.companyname.com, he used to get the above error
Two things are required:
while sending back the response, send the header whose key is Access-Control-Allow-Origin and value is *:
context.Writer.Header()["Access-Control-Allow-Origin"] = []string{"*"} // Important to avoid a CORS error
Use the Go CORS library to set AllowCredentials to false and AllowAllOrigins to true.
Use the below npm module. This has virtually saved lives.
https://www.npmjs.com/package/local-cors-proxy
You're getting a CORS error, for example like the below URL
https://www.google.co.in/search/list
After successfully installed(local-cors-proxy) global npm install -g local-cors-proxy and set proxy URL that CORS URL.
For example, here the below CORS issue getting in localhost. So you need to add the domain name(https://www.google.co.in) and port(--port 8010) for the CORS issue domain.
For more please check the link
https://www.npmjs.com/package/local-cors-proxy
lcp --proxyUrl https://www.google.co.in --port 8010
After successfully set, it will generate the local proxy URL like below.
http://localhost:8010/proxy
Use that domain name in your project API URL.
API full URL:
http://localhost:8010/proxy/search/list
To get without a CORS issue response in your local project.
Using WebAPI build in .Net Core 6.0
None of the above worked for me... This did it
// global cors policy
app.UseCors(x => x
.AllowAnyMethod()
.AllowAnyHeader()
.SetIsOriginAllowed(origin => true) // allow any origin
.AllowCredentials());
credit: https://stackoverflow.com/a/70660054/8767516
Try adding all these headers in this code below Before every route, you define in your app, not after the routes
app.use((req, res, next) =>{
res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('Access-Control-Allow-Headers','Origin, X-Requested-With, Content-Type,Accept, Authortization');
res.setHeader('Acces-Control-Allow-Methods','GET, POST, PATCH, DELETE');
If you are getting this error while deploying React app to netlify, use these steps.
step 1: Create netlify.toml file in the root folder of your react app.
step 2: Copy paste this code:
`[[redirects]]
from = "/cors-proxy/*"
to = ":splat"
status = 200
force = true`
step3: update your fetch/axios api this way:
It took me a while to figure this out.

Nuxt.js Caching Problem and 'Access-Control-Allow-Headers' Problem

I've just deployed a nuxt app to the server, but it caches in a bad way. in any device, logged in or not, I get one user information, it's cookie and token! I tried to find out what is the problem, I searched and now I think because cache-control: public with max-age=31536000, now I've tried to set it to private or no-cache.
I have two questions:
which cache-control value should I use? private or no-cache, etc? or even is this problem is because of caching?
when I try to set headers of axios in nuxt.config.js , I get this error:
Access to XMLHttpRequest at 'url of the backend' from origin 'http://localhost:3000' has been blocked by CORS policy: Request header field cache-control is not allowed by Access-Control-Allow-Headers in preflight response.
I've tried to set Access-Control-Allow-Headers but it did'n work, my nuxt.config.js, the axios part is like this:
axios: {
baseURL: 'backend',
headers: {
common: {
'Access-Control-Allow-Headers': 'cache-control',
'cache-control': 'private',
},
},
}
thank you.
After a While, I found the answer, Nuxt.js by default cache all the responses (it does not any relation to axios requests) in it's node server, so if you want to fix this situation add cache: false to build property in nuxt.config.js for universal mode (for static mode add this property to generate)
// nuxt.config.js
{
// ...
build: {
cache: false
}
// ...
}
More info in the docs

Keycloak frontend and backend clients

This is related to keycloak clients. My frontend is connected to public client and backend is connected to confidential client.
I am able to login, get the code, as I am using response_type=code by turning on "Standard Flow Enabled".
This code redirects and returns me Idtoken, refreshtoken and token.
Now I need to communicate with backend which is confidential, I would like to authenticate user using some of the values which I have received from the frontend client.
How can I do that?
Here is my frontend and backend conf
FRONTEND
{
"realm": "xyz",
"auth-server-url": "http://localhost:8333/auth/",
"ssl-required": "external",
"resource": "frontend-app",
"public-client": true,
"confidential-port": 0,
"enable-cors": true
}
BACKEND
keycloak.auth-server-url=http://localhost:8333/auth
keycloak.realm=xyz
keycloak.resource=backend-app
keycloak.principal-attribute=preferred_username
keycloak.bearer-only=true
keycloak.credentials.secret=xxx-xxx-xxx
this is from realm setting
This might help somebody.
My backend service which is springboot project with spring security keycloakAuthenticationProvider does authenticate the token received from the frontend public client.
Call from frontend
axios({
method: 'GET',
url: '/api/authenticate',
headers:{'Authorization': 'Bearer '+keycloak.token+''}
}).then((r) => {
console.log("response",r)
})
Call to backend
#GetMapping("/api/authenticate")
public ResponseEntity<SecureUserDto> authenticate() {
String username = SecurityContextHolder.getContext().getAuthentication().getPrincipal().toString();
User user = userRepository.findWithPrivilegesByUsername(username);
return ResponseEntity.ok();
}
But i still was not able to get it right on postman at ../token end point provided by keycloak server.
Anyways my work is done.

Spring Boot OAuth 2 SSO how to extract token to pass back to thick client application

I have a thick client application (C# but that should not matter).
All the users already exist in an authentication/authorization (3rd party) system that provides OAuth 2 API (authorize/access_token plus a user_info service).
I have a Spring Boot web service tier that will have RESTful web services that will be called by the thick client application that must only be called by authenticated users for protected web services.
To authenticate the thick client will launch a Web Browser (OS installed default) and will open https to restful.web.server:8443 /login of the Spring Boot web service tier. This will do the OAuth 2 (authorization_code) interaction. Once redirected back with a valid token I want to redirect to a custom URI passing the token and for the browser to close (if possible) so an OS registered application can extract the token and pass it via an IPC mechanism to the thick client application.
The thick client application can then pass the token to the Web Services in the header (Authorize: TOKEN_TYPE TOKEN_VALUE).
The Web Services must then validate the authenticity of the token.
The Web Services if called with an invalid token must just return an HTTP error and JSON error content (e.g. code+message) and not try and redirect to the login screen. This will be orchestrated by the thick client application.
I have no concern with any of the custom URI handling, IPC development, or thick client web service calls. It is all the Spring/SSO magic in getting the token to be sent to my thick client and returning the relevant error from protected web services without returning a redirect to the SSO login.
I appear to be authenticating and being sent a token but then I get an exception.
I have made some progress and it appears that by manually launching a browser and hitting my web service tier https to restful.web.server:8443 /login it redirects to the SSO site https to 3rdparty.sso.server /oauth/authorization (passing in client_id, redirect_uri, response_type=code, state). I can log in, and Spring is calling the https to 3rdparty.sso.server /oauth/access_token endpoint (I had to create a custom RequestEnhancer to add in Authorization: Basic ENCODED_CLIENT_ID_AND_CLIENT_SECRET to satisfy the access_token SSO API requirement).
This returns 200 OK but then I get exceptions and do not know how to extract the token. The access_token returned may not be using the standard property names but unsure when to go and check if this is the case. I done the authentication this way to keep the client id and client secret out of the thick client application and my web services must do the authorisation anyway. If there is a better way or pointers to someone else doing this already it would be greatly appreciated. I find so many examples that are either not quite relevant or more towards web applications.
server:
port: 8443
ssl:
key-store: classpath:keystore.p12
key-store-password: **********
keyStoreType: PKCS12
keyAlias: tomcat
servlet:
context-path: /
session:
cookie:
name: UISESSION
security:
basic:
enabled: false
oauth2:
client:
clientId: *******
clientSecret: *****************
accessTokenUri: https://3rdparty.sso.server/oauth2/access_token
userAuthorizationUri: https://3rdparty.sso.server/oauth2/authorize
authorizedGrantTypes: authorization_code,refresh_token
scope:
tokenName: accessToken
redirectUri: https://restful.web.server:8443/login
authenticationScheme: query
clientAuthenticationScheme: header
resource:
userInfoUri: https://3rdparty.sso.server/oauth2/userinfo
logging:
level:
org:
springframework: DEBUG
spring:
http:
logRequestDetails: true
logResponseDetails: true
#Configuration
#EnableOAuth2Sso
#Order(value=0)
public class ServiceConectWebSecurityConfigurerAdapter extends WebSecurityConfigurerAdapter
{
#Override
protected void configure(HttpSecurity http) throws Exception {
http
// From the root '/' down...
.antMatcher("/**")
// requests are authorised...
.authorizeRequests()
// ...to these url's...
.antMatchers("/", "/login**", "/debug/**", "/webjars/**", "/error**")
// ...without security being applied...
.permitAll()
// ...any other requests...
.anyRequest()
// ...the user must be authenticated.
.authenticated()
.and()
.formLogin().disable()
.logout()
.logoutSuccessUrl("/login")
.permitAll()
.and()
.csrf()
.csrfTokenRepository(CookieCsrfTokenRepository.withHttpOnlyFalse())
;
}
I expect that the secured web services would be accessible once authenticated via the browser whilst testing without the client and would not expect exceptions to be thrown. I need to be able to extract the returned token and pass it back to my thick client.
Redirects to 'https://3rdparty.sso.server/oauth2/authorize?client_id=***HIDDEN_CLIENT_ID***&redirect_uri=https://localhost:8443/login&response_type=code&state=***HIDDEN_STATE_1***'
Then FilterChainProxy : /login?code=***HIDDEN_CODE_1***&state=***HIDDEN_STATE_1*** at position 6 of 12 in additional filter chain;
Request is to process authentication
RestTemplate : HTTP POST https://3rdparty.sso.server/oauth2/access_token
RestTemplate : Response 200 OK
IllegalStateException: Access token provider returned a null access token, which is illegal according to the contract.
at OAuth2RestTemplate.acquireAccessToken(OAuth2RestTemplate.java:223) ```
Then end up at an error page
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
There was an unexpected error (type=Internal Server Error, status=500).
Access token provider returned a null access token, which is illegal according to the contract.
The access_token service was returning non-standard JSON names.
I created a MyOwnOAuth2AccessToken with the relevant non-standard JSON names the necessary de/serialisation classes.
I created a MyOauth2AccesTokenHttpMessageConverter class for returning my OAuth2AccessToken.
The MyOauth2AccesTokenHttpMessageConverter was plumbed in from an
#Configuration
public class ServiceConnectUserInfoRestTemplateFactory implements UserInfoRestTemplateFactory
within the
#Bean
#Override
public OAuth2RestTemplate getUserInfoRestTemplate()
method with the following code:
List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
messageConverters.add(new ItisOAuth2AccessTokenHttpMessageConverter());
messageConverters.addAll((new RestTemplate()).getMessageConverters());
accessTokenProvider.setMessageConverters(messageConverters);
There is probably a better way to do this but this worked for me.

production build of ember app works, but when using ember serve, cookies not sent to api

I have a rest API running on localhost:8001/my_app/api/, and I have apache setup to reverse proxy it from localhost/my_app/api. That's working fine.
In order to have permissions to do anything with the api, it requires my session cookie, my csrftoken cookie and a X-CSRFToken HTTP header. I've configured adapters/application.js as follows:
adapters/application.js
import Ember from 'ember';
import DRFAdapter from './drf';
export default DRFAdapter.extend({
headers: Ember.computed(function() {
return {
'X-CSRFToken': Ember.get(document.cookie.match(/csrftoken\=([^;]*)/), '1'),
};
}).volatile(),
ajax: function(url, method, hash) {
hash = hash || {}; // hash may be undefined
hash.crossDomain = true;
hash.xhrFields = {withCredentials: true};
return this._super(url, method, hash);
}
});
If I do a ember build -prod and copy the contents of the dist dir to /var/www/myApp/, apache serves my app, and it works just fine.
It's when I try to use ember-cli's builtin development server where I run into problems. I'm getting 403 errors from my api. It turns out that while the X-CSRFToken header is being sent neither of my cookies are. If I look in my chrome developer tools, it shows that I have both cookies - they simply aren't in the request headers. They're both from localhost, so I'm a bit confused.
Also, I currently I have CORS on my rest backend setup. Here are the headers I'm currently receiving:
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: http://localhost:4200
I thought that since allow-credentials == true and allow-origin != * that cookies were supposed to be allowed. sigh.
Here's my API_HOST and contentSecurityPolicy:
config/environment.js
if (environment === 'development') {
ENV.APP.LOG_TRANSITIONS = true;
ENV.APP.API_HOST = "http://localhost"
ENV.contentSecurityPolicy = {
'default-src': "'none'",
'script-src': "'self' 'unsafe-eval' localhost",
'font-src': "'self'",
'connect-src': "'self' localhost",
'img-src': "'self'",
'style-src': "'self'",
'media-src': "'self'"
};
}
As you can see above, the api requests are being sent through my reverse proxy. I've played around with ember serve --proxy trying both http://localhost:80/ and http://localhost:8001/ but neither have helped. I've also tried setting my development ENV.API_HOST = 'http://localhost:8001/'; with and without the various proxy values.
This edit, build, deploy, refresh my browser, test, & repeat process is REALLY slow and getting old REALLY fast.
Could someone please explain to me how to get the ember-cli development server to properly access my rest api?