Authentication with SharePoint Online

Hi
I have a win32 C++ application which is able, using NTLM authentication, to call the different SharePoint web services (lists, copy, etc) in a local SharePoint installation. This is done by building XML SOAP requests at runtime and HTTP posting.
This approach does not work with SharePoint Online and I was wondering if it was possible to make the existing code work without a total rewrite.
I have experience with OAuth 2 as I have previously integrated to OneDrive, Google Drive, Dropbox etc. using their REST web service api.
Is it also possible to use OAuth 2 with SharePoint Online and the web services in a similar fashion? Have refresh tokens and exchanging them for access tokens which are sent to server in post.
I have tried playing around with it, creating an app in the Microsoft Seller Dashboard and tried using client id with OAuthAuthorize.aspx, but getting error 'The clientId 'xxx'
is not a valid service identity.". No idea what that means.
Am I going the wrong way and can someone point me in the right direction?
Thanks!

Hi,
In order to access SharePoint Online via REST API, we can use SharePointOnlineCredentials object to pass the authentication.
Here’s a code sample that connects to the REST API:
var creds = new SharePointOnlineCredentials(SPO_USERNAME, StringUtilities.ToSecureString(SPO_PASSWORD));
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(SPO_URL + "/_api/web/lists");
request.Credentials = creds;
request.Method = "GET";
request.Accept = "application/json;odata=verbose";
request.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED: f");
var response = (HttpWebResponse)request.GetResponse();
using (var reader = new System.IO.StreamReader(response.GetResponseStream()))
Console.WriteLine(reader.ReadToEnd());
More information:
http://msdn.microsoft.com/en-us/library/office/microsoft.sharepoint.client.sharepointonlinecredentials(v=office.15).aspx
http://sharepointtaproom.com/2014/01/23/connecting-to-sharepoint-onlines-csom-or-rest-apis-from-sharepoint-2010/
http://sergeluca.wordpress.com/2009/08/31/calling-sharepoint-dlls-from-c-code/
Best regards
Dennis Guo
TechNet Community Support

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I Think that is a simple error, but I don’t have enough knowledge in .NET apps.
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This App run ok.
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Hi raygabe,
I couldn't find the document mentioned there is any compatibility between Office365 SharePoint online and Office Home and Business 2013 version, I would recommend that you check if the issue could be reproduced on other Win7 machines installed with Office
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http://community.office365.com/en-us/f/154.aspx
https://social.technet.microsoft.com/Forums/office/en-us/home?category=officeitpro
Thanks,
Daniel Yang
Forum Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you havefeedback for TechNet Subscriber Support, contact [email protected]
Daniel Yang
TechNet Community Support

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Blog:
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Hi,
Does the account in use has the permission to access the SharePoint list? By default, we will come across the “Access Denied” if the current account has no access to a SharePoint
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Patrick Liang
Forum Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]
Patrick Liang
TechNet Community Support

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Hi,
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Best Regards
Dennis Guo
TechNet Community Support

Building Site Collections in SharePoint Online

Hello all,
Please forgive me for this very basic question, but I was not able to find the info online.
Background info: I have a great deal of experience with SharePoint administration on-prem but not much experience with SharePoint Online. My current organization has O365 and wants to build a collaboration environment and an Intranet. I understand the information
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This is the article that initially caused me to believe that this is possible/a good idea: http://blogs.msdn.com/b/richard_dizeregas_blog/archive/2014/09/01/sharepoint-online-information-architecture-considerations.aspx.
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"You cannot separate the roles of Office 365 global administrator and SharePoint Online Administrator."
Thus, I don't currently have the level of access I need to browse around the administration area and find the answers to my questions that way. When the time comes, I will likely be given temporary access or will be working with an O365 global administrator
to build.
Main question: Will I be allowed to build site collections under managed paths?
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Thanks in advance for any insight you can offer.
Shae

Hi,
According to the error message, the Microsoft.Online.SharePoint.Client.Tenant.dll seems not been loaded.
You can find it in the path below:
C:\Program Files\SharePoint Client Components\Assemblies
A code snippet about how to retrieve a list of site collections in a tenant for your reference:
const string username = "[email protected]";
const string password = "password";
const string tenantAdminUrl = "https://yourdomain-admin.sharepoint.com/";
var securedPassword = new SecureString();
foreach (var c in password.ToCharArray()) securedPassword.AppendChar(c);
var credentials = new SharePointOnlineCredentials(username, securedPassword);
using (var context = new ClientContext(tenantAdminUrl))
context.Credentials = credentials;
var tenant = new Tenant(context);
SPOSitePropertiesEnumerable spp = tenant.GetSiteProperties(0, true);
context.Load(spp);
context.ExecuteQuery();
foreach (SiteProperties sp in spp)
Console.WriteLine(sp.Title);
Best regards,
Patrick
Patrick Liang
TechNet Community Support

Authentication with SharePoint Online

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