I am trying to create a Web API server using ASP.NET Core 2.0 which uses azure ad v2 endpoint token authorization. I also have an Angular 2 app where the office365 login happens. I get a token from there and then send a simple request to an authorized action in the Web API server. However my token doesn't pass the authorization checks and I get a 401 Unauthorized response. The description provided is:
Bearer error="invalid_token", error_description="The signature key was not found"
I decoded the token and the decoder throws an invalid signature error as well. Here are the important parts of my code I use for configuration and token authorization:
Web API Server:
appsettings.json
{
"AzureAd": {
"Instance": "https://login.microsoftonline.com/",
"ClientId": "my-registered-app-client-id",
},
"Logging": {
"IncludeScopes": false,
"Debug": {
"LogLevel": {
"Default": "Warning"
}
},
"Console": {
"LogLevel": {
"Default": "Warning"
}
}
}
}
AzureAdAuthenticationBuilderExtensions.cs
public static class AzureAdServiceCollectionExtensions
{
public static AuthenticationBuilder AddAzureAdBearer(this AuthenticationBuilder builder)
=> builder.AddAzureAdBearer(_ => { });
public static AuthenticationBuilder AddAzureAdBearer(this AuthenticationBuilder builder, Action<AzureAdOptions> configureOptions)
{
builder.Services.Configure(configureOptions);
builder.Services.AddSingleton<IConfigureOptions<JwtBearerOptions>, ConfigureAzureOptions>();
builder.AddJwtBearer();
return builder;
}
private class ConfigureAzureOptions: IConfigureNamedOptions<JwtBearerOptions>
{
private readonly AzureAdOptions _azureOptions;
public ConfigureAzureOptions(IOptions<AzureAdOptions> azureOptions)
{
_azureOptions = azureOptions.Value;
}
public void Configure(string name, JwtBearerOptions options)
{
options.Audience = _azureOptions.ClientId;
options.Authority = $"{_azureOptions.Instance}common/v2.0";
options.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuer = false,
};
}
public void Configure(JwtBearerOptions options)
{
Configure(Options.DefaultName, options);
}
}
}
Startup.cs
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddAuthentication(sharedOptions =>
{
sharedOptions.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddAzureAdBearer(options => Configuration.Bind("AzureAd", options));
services.AddMvc();
services.AddCors(options =>
{
options.AddPolicy("AllowAllOrigins",
builder =>
{
builder.AllowAnyMethod().AllowAnyHeader().AllowAnyOrigin();
});
});
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole(Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseCors("AllowAllOrigins");
app.UseAuthentication();
app.UseMvc();
}
}
Now here is the code I use to authenticate in my Angular2 app:
import { Injectable } from '@angular/core';
import { Headers } from '@angular/http';
import * as hello from 'hellojs/dist/hello.all.js';
import * as MicrosoftGraph from "@microsoft/microsoft-graph-types";
import * as MicrosoftGraphClient from "@microsoft/microsoft-graph-client";
import { Configs } from "../../../shared/configs"
@Injectable()
export class HttpService {
url = `https://login.microsoftonline.com/common/oauth2/v2.0/authorize?client_id=${Configs.appId}&response_type=code&redirect_uri=http%3A%2F%2Flocalhost%2Fmyapp%2F&response_mode=query&scope=openid%20offline_access%20https%3A%2F%2Fgraph.microsoft.com%2Fmail.read&state=12345`;
getAccessToken() {
const msft = hello('msft').getAuthResponse();
const accessToken = msft.access_token;
return accessToken;
}
getClient(): MicrosoftGraphClient.Client
{
var client = MicrosoftGraphClient.Client.init({
authProvider: (done) => {
done(null, this.getAccessToken()); //first parameter takes an error if you can't get an access token
},
defaultVersion: 'v2.0'
});
return client;
}
}
When a token is returned from the endpoint I send a request to a valid endpoint on my Web API server.
Important note: I am using the same AppId in both my Web API and Angular app because it is required by the AzureAd v2.0 endpoint.
My point is that I think I'm doing everything by the book but there is obviously something missing. If anyone could tell me what I did wrong in my configuration, I'd be immeasurably grateful!
aud property of decoded token is:
https://graph.microsoft.com
