retrieving sharepoint online authentication cookie and using it elsewhere

Question

so if a person goes to sharepoint online, logs in, how can I get the cookie that tells sharepoint later on that you are logged in so I can have something else use it and access sharepoint?

Answer 1

If I'm correctly understanding, you are asking how to programmatically get SharePoint auth cookies?

In .net you can use SharePoint Server 2013 Client Components SDK to get cookies see example below:

var login    = "admin@***.onmicrosoft.com";
var password = "P@ssw0rd";
var siteUrl  = "https://***.sharepoint.com/";

var creds = new SharePointOnlineCredentials(login, password);
var auth  = creds.AuthenticateAsync(new Uri(siteUrl), true);

var request = (HttpWebRequest)WebRequest.Create(siteUrl);
request.CookieContainer = auth.Result.CookieContainer;

var result = (HttpWebResponse)request.GetResponse();