Resetting Cross-Site Request Forgery (CSRF

Struggling to integrate Django's csrf with Angular 6? Check out this insightful thread I came across. It seems that Django changes the token on login, which makes sense as I can register and login using post requests but encounter issues posting after login.

The challenge now is resetting the csrf token upon login. Below is how my Angular app currently handles csrf in the app module:

import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { NgModule } from '@angular/core';
import { HttpClientModule } from '@angular/common/http';
import { HttpModule, XSRFStrategy, CookieXSRFStrategy } from '@angular/http'

import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
import { RegisterComponent } from './register/register.component';
import { LoginComponent } from './login/login.component';
import { AlertComponent } from './_directives/alert.component';
import { ProfileComponent } from './profile/profile.component';
import { AuthGuardService } from './_guards/auth-guard.service';
import { AlertService } from './_services/alert.service';
import { AuthService } from './_services/auth.service';
import { UserService } from './_services/User.service';

@NgModule({
  declarations: [
    AppComponent,
    RegisterComponent,
    LoginComponent,
    AlertComponent,
    ProfileComponent,
  ],
  imports: [
    BrowserModule,
    FormsModule,
    ReactiveFormsModule,
    AppRoutingModule,
    HttpClientModule,
    HttpModule
  ],
  providers: [
    {
      provide: XSRFStrategy,
      useValue: new CookieXSRFStrategy('csrftoken', 'X-CSRFToken')
    }
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

My question now is: How can I ensure my app resets the csrf value on login or any other appropriate event?

Answer №1

Thank you for your interesting question, it presents some complexities that I will attempt to address based on my understanding from various sources. While there is no definitive post or article on this topic, I have synthesized information from multiple readings:

  • Both Django and Angular inherently handle CSRF (Cross-Site Request Forgery) protection automatically, eliminating the need for manual intervention when making POST requests.
  • In contrast to jQuery, which requires extracting the CSRFToken from the cookie and manually setting it in the headers as "X-CSRFToken."
  • Angular lacks predefined key names for CSRF token retrieval and header setting, necessitating configuration of these key names within Angular settings.
  • Note that only key names are configured, not values, as Angular handles this process internally due to its default functionality.

For configuring key names in Angular 1:

`$httpProvider.defaults.xsrfCookieName = 'csrftoken';`
`$httpProvider.defaults.xsrfHeaderName = 'X-CSRFToken';`

Similarly, in Angular 2 and above:

bootstrap(AngularApp, [
      HTTP_PROVIDERS,
      provide(XSRFStrategy, {useValue: new CookieXSRFStrategy('csrftoken', 'X-CSRFToken')})
    ]);
  • After logging in, the CSRFToken value changes, requiring a subsequent GET request to retrieve and update the token before initiating another POST request.

To facilitate cookie handling by Django, the Angular app must initiate a preliminary GET request to the Django server.

This approach is applicable when CSRF_USE_SESSIONS is set to False, enabling Django to embed the CSRF Token in the cookie.

Further resources:

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