Angular Lib for OpenID Connect Code Flow with PKCE and Implicit Flow

OpenID Code Flow with PKCE, OpenID Connect Implicit Flow

OpenID Certification

This library is certified by OpenID Foundation. (RP Implicit and Config RP)

Features

• version 4.1.0 Angular 4 to Angular 5.2.10, Version 6.0.0, Angular 6 onwards
• Supports OpenID Connect Code Flow with PKCE
• Supports OpenID Connect Implicit Flow http://openid.net/specs/openid-connect-implicit-1_0.html
• Complete client side validation for REQUIRED features
• OpenID Connect Session Management 1.0 http://openid.net/specs/openid-connect-session-1_0.html
• AOT build
• Can be lazy loaded

Documentation : Quickstart | API Documentation | Changelog

Using the package

Navigate to the level of your package.json and type

 npm install angular-auth-oidc-client

or with yarn

 yarn add angular-auth-oidc-client

or you can add the npm package to your package.json

 "angular-auth-oidc-client": "^9.0.8"

and type

 npm install

Configuration

Approach 1: APP_INITIALIZER

Import the module and services in your module.

The OidcSecurityService has a dependency on the HttpClientModule which needs to be imported. The angular-auth-oidc-client module supports all versions of Angular 4.3 onwards.

Loading the configuration from the server

import { HttpClientModule } from '@angular/common/http';
import { APP_INITIALIZER, NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouterModule } from '@angular/router';
import {
    AuthModule,
    AuthWellKnownEndpoints,
    OidcConfigService,
    OidcSecurityService,
    OpenIDImplicitFlowConfiguration,
} from 'angular-auth-oidc-client';
import { AppComponent } from './app.component';

const oidc_configuration = 'assets/auth.clientConfiguration.json';
// if your config is on server side
// const oidc_configuration = ${window.location.origin}/api/ClientAppSettings

export function loadConfig(oidcConfigService: OidcConfigService) {
    return () => oidcConfigService.load(oidc_configuration);
}

@NgModule({
    declarations: [AppComponent],
    imports: [
        BrowserModule,
        HttpClientModule,
        RouterModule.forRoot([
            { path: '', component: AppComponent },
            { path: 'home', component: AppComponent },
            { path: 'forbidden', component: AppComponent },
            { path: 'unauthorized', component: AppComponent },
        ]),
        AuthModule.forRoot(),
    ],
    providers: [
        OidcConfigService,
        {
            provide: APP_INITIALIZER,
            useFactory: loadConfig,
            deps: [OidcConfigService],
            multi: true,
        },
    ],
    bootstrap: [AppComponent],
})
export class AppModule {
    constructor(private oidcSecurityService: OidcSecurityService, private oidcConfigService: OidcConfigService) {
        this.oidcConfigService.onConfigurationLoaded.subscribe(() => {
          const oidcFlowConfig = new OpenIDImplicitFlowConfiguration();
          //merge configuration loaded from assets/auth.clientConfiguration.json
          Object.assign(oidcFlowConfig, this.oidcConfigService.clientConfiguration);
          this.oidcSecurityService.setupModule(oidcFlowConfig, this.oidcConfigService.wellKnownEndpoints);
        });
    }
}

assets/auth.clientConfiguration.json

See Auth documentation for the detail of each field.

{
	"stsServer": "https://localhost:44318",
	"redirect_url": "https://localhost:44311",
	"client_id": "angularclient",
	"response_type": "code",
	"scope": "dataEventRecords securedFiles openid profile",
	"post_logout_redirect_uri": "https://localhost:44311",
	"start_checksession": true,
	"silent_renew": true,
	"silent_renew_url": "https://localhost:44311/silent-renew.html",
	"post_login_route": "/home",
	"forbidden_route": "/forbidden",
	"unauthorized_route": "/unauthorized",
	"log_console_warning_active": true,
	"log_console_debug_active": true,
	"max_id_token_iat_offset_allowed_in_seconds": 10,
}

At present only the 'code' with PKCE, 'id_token token' or the 'id_token' flows are supported:

"response_type": ["code" | "id_token token" | "id_token" ]

Note the configuration json must have a property stsServer for this to work.

Approach 2. Configuration without APP_INITIALIZER

export class AppModule {
    constructor(public oidcSecurityService: OidcSecurityService) {
        const config = new OpenIDImplicitFlowConfiguration();

        config.stsServer = 'https://localhost:44363';
        config.redirect_url = 'https://localhost:44363';
        // The Client MUST validate that the aud (audience) Claim contains its client_id value registered at the Issuer identified by the iss (issuer) Claim as an audience.
        // The ID Token MUST be rejected if the ID Token does not list the Client as a valid audience, or if it contains additional audiences not trusted by the Client.
        config.client_id = 'singleapp';
        config.response_type = 'code'; // 'id_token token' Implicit Flow
        config.scope = 'dataEventRecords openid';
        config.post_logout_redirect_uri = 'https://localhost:44363/Unauthorized';
        config.start_checksession = false;
        config.silent_renew = true;
        config.silent_renew_url = 'https://localhost:44363/silent-renew.html';
        config.post_login_route = '/dataeventrecords';

        config.forbidden_route = '/Forbidden';
        // HTTP 401
        config.unauthorized_route = '/Unauthorized';
        config.log_console_warning_active = true;
        config.log_console_debug_active = true;
        // id_token C8: The iat Claim can be used to reject tokens that were issued too far away from the current time,
        // limiting the amount of time that nonces need to be stored to prevent attacks.The acceptable range is Client specific.
        config.max_id_token_iat_offset_allowed_in_seconds = 10;

        const authWellKnownEndpoints = new AuthWellKnownEndpoints();
        authWellKnownEndpoints.issuer = 'https://localhost:44363';

        authWellKnownEndpoints.jwks_uri = 'https://localhost:44363/.well-known/openid-configuration/jwks';
        authWellKnownEndpoints.authorization_endpoint = 'https://localhost:44363/connect/authorize';
        authWellKnownEndpoints.token_endpoint = 'https://localhost:44363/connect/token';
        authWellKnownEndpoints.userinfo_endpoint = 'https://localhost:44363/connect/userinfo';
        authWellKnownEndpoints.end_session_endpoint = 'https://localhost:44363/connect/endsession';
        authWellKnownEndpoints.check_session_iframe = 'https://localhost:44363/connect/checksession';
        authWellKnownEndpoints.revocation_endpoint = 'https://localhost:44363/connect/revocation';
        authWellKnownEndpoints.introspection_endpoint = 'https://localhost:44363/connect/introspect';

        this.oidcSecurityService.setupModule(config, authWellKnownEndpoints);
    }
}

Custom STS server well known configuration

Sometimes it is required to load custom .well-known/openid-configuration. The load_using_custom_stsServer can be used for this.

export function loadConfig(oidcConfigService: OidcConfigService) {
    return () =>
        oidcConfigService.load_using_custom_stsServer(
            'https://login.microsoftonline.com/fabrikamb2c.onmicrosoft.com/v2.0/.well-known/openid-configuration?p=b2c_1_susi'
        );
}

Usage

Code Flow with PKCE

It is recomended flow in SPA applications, see SECURELY USING THE OIDC AUTHORIZATION CODE FLOW AND A PUBLIC CLIENT WITH SINGLE PAGE APPLICATIONS.

Not all security service providers and servers support it yet.

Create the login, logout component and use the oidcSecurityService

import { Component, OnDestroy, OnInit } from '@angular/core';
import { OidcSecurityService } from 'angular-auth-oidc-client';
import { filter, take } from 'rxjs/operators';

@Component({
    selector: 'app-root',
    templateUrl: 'app.component.html',
})
export class AppComponent implements OnInit, OnDestroy {
    isAuthenticated: boolean;
    userData: any;

    constructor(public oidcSecurityService: OidcSecurityService) {
        if (this.oidcSecurityService.moduleSetup) {
            this.doCallbackLogicIfRequired();
        } else {
            this.oidcSecurityService.onModuleSetup.subscribe(() => {
                this.doCallbackLogicIfRequired();
            });
        }
    }

    ngOnInit() {
        this.oidcSecurityService.getIsAuthorized().subscribe(auth => {
            this.isAuthenticated = auth;
        });

        this.oidcSecurityService.getUserData().subscribe(userData => {
            this.userData = userData;
        });
    }

    ngOnDestroy(): void {}

    login() {
        this.oidcSecurityService.authorize();
    }

    logout() {
        this.oidcSecurityService.logoff();
    }

    private doCallbackLogicIfRequired() {
        // Will do a callback, if the url has a code and state parameter.
        this.oidcSecurityService.authorizedCallbackWithCode(window.location.toString());
    }
}

Implicit Flow (Not recommended)

This flow is no longer recommended, but some servers support this flow only, and not the Code flow with PKCE.

Create the login, logout component and use the oidcSecurityService

private doCallbackLogicIfRequired() {
  if (window.location.hash) {
    this.oidcSecurityService.authorizedImplicitFlowCallback();
  }
  }

And a simple template for the component.

<button *ngIf="!isAuthenticated" (click)="login()">Login</button>
<button *ngIf="isAuthenticated" (click)="logout()">Logout</button>

<hr />

Is Authenticated: {{ isAuthenticated }}

<br />
<br />

{{ userData | json }}

Silent Renew

When silent renew is enabled, a DOM event will be automatically installed in the application's host window. The event oidc-silent-renew-message accepts a CustomEvent instance with the token returned from the OAuth server in its detail field. The event handler will send this token to the authorization callback and complete the validation.

Point the silent_renew_url property to an HTML file which contains the following script element to enable authorization.

Code Flow with PKCE

<script>
	window.onload = function () {
		/* The parent window hosts the Angular application */
		var parent = window.parent;
		/* Send the id_token information to the oidc message handler */
		var event = new CustomEvent('oidc-silent-renew-message', { detail: window.location });
		parent.dispatchEvent(event);
	};
</script>

Silent Renew Angular-CLI

Add the silent-renew.html file to the angular.json assets configuration

"assets": [
              "projects/sample-code-flow/src/silent-renew.html",
              "projects/sample-code-flow/src/favicon.ico",
              "projects/sample-code-flow/src/assets"
            ],

Using the access_token

In the http services, add the token to the header using the oidcSecurityService

private setHeaders() {
	this.headers = new HttpHeaders();
	this.headers = this.headers.set('Content-Type', 'application/json');
	this.headers = this.headers.set('Accept', 'application/json');

	const token = this._securityService.getToken();
	if (token !== '') {
		const tokenValue = 'Bearer ' + token;
		this.headers = this.headers.set('Authorization', tokenValue);
	}
}

Using Guards

import { Injectable } from '@angular/core';
import { Router, CanActivate, CanLoad, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { Observable } from 'rxjs';
import { tap } from 'rxjs/operators';

import { OidcSecurityService } from './auth/services/oidc.security.service';

@Injectable()
export class AuthorizationGuard implements CanActivate, CanLoad {
    constructor(private router: Router, private oidcSecurityService: OidcSecurityService) {}

    canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> {
        return this.checkUser();
    }

    canLoad(state: Route): Observable<boolean> {
        return this.checkUser();
    }

    private checkUser(): Observable<boolean> {
        return this.oidcSecurityService.getIsAuthorized().pipe(
            map((isAuthorized: boolean) => {
                if (!isAuthorized) {
                    this.router.navigate(['/unauthorized']);
                    return false;
                }
                return true;
            })
        );
    }
}

Custom Storage

If you need, you can create a custom storage (for example to use cookies).

Implement OidcSecurityStorage class-interface and the read and write methods:

@Injectable()
export class CustomStorage implements OidcSecurityStorage {

    public read(key: string): any {
        ...
        return ...
    }

    public write(key: string, value: any): void {
        ...
    }

}

Then provide the class in the module:

@NgModule({
    imports: [
        ...
        AuthModule.forRoot({ storage: CustomStorage })
    ],
    ...
})

See also oidc.security.storage.ts for an example.

Http Interceptor

The HttpClient allows you to write interceptors. A common usecase would be to intercept any outgoing HTTP request and add an authorization header. Keep in mind that injecting OidcSecurityService into the interceptor via the constructor results in a cyclic dependency. To avoid this use the injector instead.

@Injectable()
export class AuthInterceptor implements HttpInterceptor {
    private oidcSecurityService: OidcSecurityService;

    constructor(private injector: Injector) {}

    intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        let requestToForward = req;

        if (this.oidcSecurityService === undefined) {
            this.oidcSecurityService = this.injector.get(OidcSecurityService);
        }
        if (this.oidcSecurityService !== undefined) {
            let token = this.oidcSecurityService.getToken();
            if (token !== '') {
                let tokenValue = 'Bearer ' + token;
                requestToForward = req.clone({ setHeaders: { Authorization: tokenValue } });
            }
        } else {
            console.debug('OidcSecurityService undefined: NO auth header!');
        }

        return next.handle(requestToForward);
    }
}

Authorizing in a popup or iframe

You can call the Provider's authorization endpoint in a popup or iframe instead of navigating to it in the app's parent window. This allows you to have the Provider's consent prompt display in a popup window to avoid unloading and reloading the app, or to authorize the user silently by loading the endpoint in a hidden iframe if that supported by the Provider.

To get the fully-formed authorization URL, pass a handler function to OidcSecurityService.authorize (this will also prevent the default behavior of loading the authorization endpoint in the current window):

login() {
    this.oidcSecurityService.authorize((authUrl) => {
        // handle the authorrization URL
        window.open(authUrl, '_blank', 'toolbar=0,location=0,menubar=0');
    });
}

Silent Renew Implicit Flow

<script>
    window.onload = function () {
    /* The parent window hosts the Angular application */
    var parent = window.parent;
    /* Send the id_token information to the oidc message handler */
    var event = new CustomEvent('oidc-silent-renew-message', {detail: window.location.hash.substr(1) });
    parent.dispatchEvent(event);
};
</script>

When silent renew is enabled, getIsAuthorized() will attempt to perform a renew before returning the authorization state. This allows the application to authorize a user, that is already authenticated, without redirects.

Silent renew requires CSP configuration, see next section.

X-Frame-Options / CSP ancestor / different domains

If deploying the client application and the STS server application with 2 different domains, the X-Frame-Options HTTPS header needs to allow all iframes. Then use the CSP HTTPS header to only allow the required domains. The silent renew requires this.

Add this header to responses from the server that serves your SPA:

Content-Security-Policy: script-src 'self' 'unsafe-inline';style-src 'self' 'unsafe-inline';img-src 'self' data:;font-src 'self';frame-ancestors 'self' https://localhost:44318;block-all-mixed-content

where https://localhost:44318 is the address of your STS server.

e.g. if you use NginX to serve your Angular application, it would be

http {
  server {
    ...
    add_header Content-Security-Policy "script-src 'self' 'unsafe-inline';style-src 'self' 'unsafe-inline';img-src 'self' data:;font-src 'self';frame-ancestors 'self' https://localhost:44318;block-all-mixed-content";

Examples using:

https://github.com/damienbod/AspNetCoreAngularSignalRSecurity

https://github.com/damienbod/dotnet-template-angular

https://github.com/damienbod/angular-auth-oidc-sample-google-openid

https://github.com/HWouters/ad-b2c-oidc-angular

https://github.com/robisim74/angular-openid-connect-php/tree/angular-auth-oidc-client

Using src code directly:

https://github.com/damienbod/AspNet5IdentityServerAngularImplicitFlow

License

MIT