I have an ASP.NET WebApi service that requires http basic authentication (this is for a demonstration, not for production, so that's the reason for basic authentication and not something more secure). The service runs fine with visual studio IIS express server and authentication happens through a custom HTTP module.
It fails and continues to popup a login screen when I deploy the site to the hosting server. I verified with Fiddler that the request is being sent and the credentials are being sent. But it keeps responding with a 401 unauthorized response. It appears that the request credentials are somehow being lost in the time it takes to get from the client to the server. I have spent many, many hours trying to diagnose this and the .NET authentication with Web API and IIS seems very confusing. Please help!!
Outgoing request from Fiddler shows:
GET mywebsiteaddress HTTP/1.1
Host: my website address
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0
Accept: /
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Authorization: Basic YmJvbm5ldDE4Om9jdG9iZXIxNw==
X-Requested-With: XMLHttpRequest
Referer: mysite
Connection: keep-alive
Here are the relevant pieces of my config (I can post more if necessary):
<modules>
<add name="BasicAuthHttpModule" type="ITMService.Modules.BasicAuthHttpModule"/>
</modules>
<httpModules>
<add name="BasicAuthHttpModule" type="ITMService.Modules.BasicAuthHttpModule"/>
</httpModules>
<authentication mode="Windows"/>
My custom http module (also working fine in testing from visual studio). This was mostly taken from the example on asp.net :
namespace ITMService.Modules
{
public class BasicAuthHttpModule : IHttpModule
{
private const string Realm = "www.mysite.net";
public void Init(HttpApplication context)
{
context.AuthenticateRequest += OnApplicationAuthenticateRequest;
context.EndRequest += OnApplicationEndRequest;
}
private static void SetPrincipal(IPrincipal principal)
{
Thread.CurrentPrincipal = principal;
if (HttpContext.Current != null)
{
HttpContext.Current.User = principal;
Log.LogIt("current principal: " + principal.Identity.Name);
}
}
private static bool CheckPassword(string username, string password)
{
string passHash = AuthUser.GetUserPassword(username);
if (PasswordHash.ValidatePassword(password, passHash))
{
return true;
}
else
{
return false;
}
}
private static bool AuthenticateUser(string credentials)
{
bool validated = false;
try
{
var encoding = Encoding.GetEncoding("iso-8859-1");
credentials = encoding.GetString(Convert.FromBase64String(credentials));
int separator = credentials.IndexOf(':');
string name = credentials.Substring(0, separator);
string password = credentials.Substring(separator + 1);
validated = CheckPassword(name, password);
if (validated)
{
var identity = new GenericIdentity(name);
SetPrincipal(new GenericPrincipal(identity, null));
}
}
catch (FormatException)
{
// Credentials were not formatted correctly.
validated = false;
Log.LogIt("not validated");
}
return validated;
}
private static void OnApplicationAuthenticateRequest(object sender, EventArgs e)
{
var request = HttpContext.Current.Request;
var authHeader = request.Headers["Authorization"];
if (authHeader != null)
{
var authHeaderVal = AuthenticationHeaderValue.Parse(authHeader);
// RFC 2617 sec 1.2, "scheme" name is case-insensitive
if (authHeaderVal.Scheme.Equals("basic",
StringComparison.OrdinalIgnoreCase) &&
authHeaderVal.Parameter != null)
{
AuthenticateUser(authHeaderVal.Parameter);
}
}
}
// If the request was unauthorized, add the WWW-Authenticate header
// to the response.
private static void OnApplicationEndRequest(object sender, EventArgs e)
{
var response = HttpContext.Current.Response;
if (response.StatusCode == 401)
{
response.Headers.Add("WWW-Authenticate",
string.Format("Basic realm=\"{0}\"", Realm));
}
}
public void Dispose()
{
}
}
}
My IIS server is hosted and running .NET 4 in integrated pipeline mode. I disabled forms authentication and disabled impersonation. I enabled basic authentication and anonymous authentication methods on the server.
I've read countless forum responses and posts about this and nothing has lead me to a clear answer.