CODEWITHSUNDEEP
pythonpowershellazureoauth-2.0
4c74356b41
4c74356b41

Reputation: 72171

Graph API authenticate as a user programmatically

I'm trying to get a specific user OAuth2 bearer token using HTTP POST request, and nothing seems to work. 

login_url = 'https://login.microsoftonline.com/'
authorize_endpoint = '{0}{1}{2}'.format(login_url,config.tenant_id,'/oauth2/authorize')

bodyvals = {'client_id': config.client_id,
            'client_secret': config.client_secret,
            'grant_type': 'client_credentials',
            'resource':config.resource_endpoint}

return requests.post(authorize_endpoint, data=bodyvals)

The above code works, but generates a token on behalf of the application.
I can't seem to find a way to pass in the users credentials, and no documentation on this whatsoever.

Generally I don't care if the answer is in Python or Powershell or just a general explanation, I just don't seem to understand how to properly do that with AAD.

Upvotes: 1

Views: 5765

Answers (2)

juunas
juunas

Reputation: 58773

You can do it manually, see my other answer here: https://stackoverflow.com/a/40844983/1658906.

You must use grant_type=password and call the oauth2/token endpoint. Here is the C# version for authenticating:

private async Task<string> GetAccessToken()
{
    string tokenEndpointUri = Authority + "oauth2/token";

    var content = new FormUrlEncodedContent(new []
        {
            new KeyValuePair<string, string>("grant_type", "password"),
            new KeyValuePair<string, string>("username", Username),
            new KeyValuePair<string, string>("password", Password),
            new KeyValuePair<string, string>("client_id", ClientId),
            new KeyValuePair<string, string>("client_secret", ClientSecret),
            new KeyValuePair<string, string>("resource", PowerBiResourceUri)
        }
    );

    using (var client = new HttpClient())
    {
        HttpResponseMessage res = await client.PostAsync(tokenEndpointUri, content);

        string json = await res.Content.ReadAsStringAsync();

        AzureAdTokenResponse tokenRes = JsonConvert.DeserializeObject<AzureAdTokenResponse>(json);

        return tokenRes.AccessToken;
    }
}

In the request you must specify:

  1. Username
  2. Password
  3. Client ID
  4. Client secret
  5. The resource URI

Upvotes: 1

Laurent Mazuel
Laurent Mazuel

Reputation: 3546

For GraphAPI, resource is "https://graph.windows.net/"

If you don't want to use ADAL, you might however take a look at the code for usage of "resource". This scenario is covered, so consider ADAL as a big sample :)

Also, msrestazure has a UserPassCredentials instance that works too on GraphAPI.

Upvotes: 0

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