I am writing a simple desktop application that needs to retrieve some basic properties about a user from Microsoft’ directory. Specifically:
- I am writing a single tenant native LOB application.
- The application runs on my desktop.
- The application runs as my logged on domain account.
- The organization' domain accounts are synced to AAD.
- I am not trying to secure a native web app or a Web API or anything like that. I do not need users to sign in.
- I have email addresses of folks in my organization from an external event management tool. I need to lookup the AAD account profile data (address book info - specifically job title) from AAD based on the email address. I will only be reading AAD data.
So far, I have done the following:-
It appears that the Azure AD Graph API is the right way to fetch the profile information. In particular, the information is available at the endpoint: https://graph.windows.net/{tenant}/users/{email}?api-version=1.6
When registering the native application in AAD, no key was provided. So I don't have a client secret.
Looked at the sample in GitHub here: https://github.com/Azure-Samples/active-directory-dotnet-graphapi-console. The instructions here seem to be wrong because no Keys section is available [see (2)].
Based on the sample above, I wrote a simple function. Code is below:
private static async Task PrintAADUserData(string email)
{
string clientId = "0a202b2c-6220-438d-9501-036d4e05037f";
Uri redirectUri = new Uri("http://localhost:4000");
string resource = "https://graph.windows.net/{tenant}";
string authority = "https://login.microsoftonline.com/{tenant}/oauth2/authorize";
AuthenticationContext authContext = new AuthenticationContext(authority);
AuthenticationResult authResult = await authContext.AcquireTokenAsync(resource, clientId, redirectUri, new PlatformParameters(PromptBehavior.Auto));
string api = String.Format("https://graph.windows.net/{tenant}/users/{0}?api-version=1.6", email);
LOG.DebugFormat("Using API URL {0}", api);
// Create an HTTP client and add the token to the Authorization header
HttpClient httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(authResult.AccessTokenType, authResult.AccessToken);
HttpResponseMessage response = await httpClient.GetAsync(api);
string data = await response.Content.ReadAsStringAsync();
LOG.Debug(data);
}
Questions
The application when run was able to bring up the authentication page. Why do I need that? The application already runs as my domain account. Is an additional authentication necessary? If I were to run this application in Azure as a worker process, then I would not want to use my domain credentials.
The primary problem seems to be the resource URL which is wrong. What resource do I need to specify to access the Azure AD Graph API?
Thanks,
Vijai.
EDITS
Based on the comments from @Saca, the code and application has been edited.
Code
string clientId = ConfigurationManager.AppSettings["AADClientId"];
string clientSecret = ConfigurationManager.AppSettings["AADClientSecret"];
string appIdUri = ConfigurationManager.AppSettings["AADAppIdURI"];
string authEndpoint = ConfigurationManager.AppSettings["AADGraphAuthority"];
string graphEndpoint = ConfigurationManager.AppSettings["AADGraphEndpoint"];
AuthenticationContext authContext = new AuthenticationContext(authEndpoint, false);
AuthenticationResult authResult = await authContext.AcquireTokenAsync("https://graph.windows.net", new ClientCredential(clientId, clientSecret));
ExistingTokenWrapper wrapper = new ExistingTokenWrapper(authResult.AccessToken);
ActiveDirectoryClient client = new ActiveDirectoryClient(new Uri(graphEndpoint), async () => await wrapper.GetToken());
IUser user = client.Users.Where(_ => _.UserPrincipalName.Equals(email.ToLowerInvariant())).Take(1).ExecuteSingleAsync().Result;
App
Error
Unhandled Exception: System.AggregateException: One or more errors occurred. ---> System.AggregateException: One or more errors occurred. ---> Microsoft.Data.OData.ODataErrorException: Insufficient privileges to complete the operation. ---> System.Data.Services.Client.DataServiceQueryException: An error occurred while processing this request. ---> System.Data.Services.Client.DataServiceClientException: {"odata.error":{"code":"Authorization_RequestDenied","message":{"lang":"en","value":"Insufficient privileges to complete the operation."}}}
It appears that despite giving the right permissions, the correct resource and being able to acquire a token, there is still something missing.