I am using WCF to develop a RESTful Web Service that acts as a proxy to a set of stored procedures that, for security reasons, cannot be directly accessed by Internet-facing applications.
The class implementing the service's DataContract has a helper property that retrieves the name of the currently logged-in user, or generates an HTTP 401 Unauthorized response if no user is currently logged in.
[ServiceContract]
public class MyService
{
// The helper property
string UserName
{
get
{
WebOperationContext context = WebOperationContext.Current;
if (context != null)
{
string authHeader = context.IncomingRequest.Headers[HttpRequestHeader.Authorization];
if (authHeader != null && authHeader.StartsWith("Basic "))
{
string string64 = authHeader.Substring(6);
byte[] array64 = Convert.FromBase64String(string64);
string decoded = ASCIIEncoding.ASCII.GetString(array64);
string[] authParts = decoded.Split(':');
if (ValidateLogin(authParts[0] /*userName*/,
authParts[1] /*password*/))
return authParts[0];
}
}
OutgoingWebResponseContext outgoing = context.OutgoingResponse;
outgoing.StatusCode = HttpStatusCode.Unauthorized;
outgoing.Headers[HttpResponseHeader.WwwAuthenticate] = "Basic";
return null;
}
}
[OperationContract]
public int LengthOfUserName()
{
return UserName.Length;
}
}
However, when I attempt to log in with a valid user name and password, I still get an Unauthorized error. What's wrong with my code?
Related
I'm building a protected api for a web application.
for each web service call client sends an access token.
when call for a resource depending on the access token it returns different responses.
ex:- call to /employees will return accessible employees only. accessibility will be defined for each access token.
my question is how it's possible to cache the response if it's returned different things depend on the access token.
is the access token part of the request which is considered in caching?
can the API be REST if it's not cacheable?
is partial access to resource allowed in REST?
#DamithK please clear what you want to do i am not getting it.."when call for a resource depending on the access token it returns different responses.
But as much i understand is that you want to authenticate your each api call.
If you are using RestClient for call api you can do it in following way.To call Api
var client = new RestClient(Serviceurl);
var request = new RestRequest("/Apimethod/{Inputs}?oauth_consumer_key=1ece74e1ca9e4befbb1b64daba7c4a24", Method.GET);
IRestResponse response = client.Execute(request);
In your service
public static class Authentication
{
public static bool AuthenticateRequest(IncomingWebRequestContext context)
{
bool Authenticated = false;
try
{
NameValueCollection param = context.UriTemplateMatch.QueryParameters;
if (param != null && param["oauth_consumer_key"] != null)
{
string consumerSecretKey = "1ece74e1ca9e4befbb1b64daba7c4a24";
Authenticated = param["oauth_consumer_key"] == consumerSecretKey;
}
else
{
WebOperationContext.Current.OutgoingResponse.StatusCode = HttpStatusCode.Unauthorized;
}
}
catch (Exception)
{
}
return Authenticated;
}
}
Validate each request in called method using
Authentication.AuthenticateRequest(WebOperationContext.Current.IncomingRequest)
All this is c# code
I created an ASP.NET WEB API 2.2 project. I used the Windows Identity Foundation based template for individual accounts available in visual studio see it here.
The web client (written in angularJS) uses OAUTH implementation with web browser cookies to store the token and the refresh token. We benefit from the helpful UserManager and RoleManager classes for managing users and their roles.
Everything works fine with OAUTH and the web browser client.
However, for some retro-compatibility concerns with desktop based clients I also need to support Basic authentication. Ideally, I would like the [Authorize], [Authorize(Role = "administrators")] etc. attributes to work with both OAUTH and Basic authentication scheme.
Thus, following the code from LeastPrivilege I created an OWIN BasicAuthenticationMiddleware that inherits from AuthenticationMiddleware.
I came to the following implementation. For the BasicAuthenticationMiddleWare only the Handler has changed compared to the Leastprivilege's code. Actually we use ClaimsIdentity rather than a series of Claim.
class BasicAuthenticationHandler: AuthenticationHandler<BasicAuthenticationOptions>
{
private readonly string _challenge;
public BasicAuthenticationHandler(BasicAuthenticationOptions options)
{
_challenge = "Basic realm=" + options.Realm;
}
protected override async Task<AuthenticationTicket> AuthenticateCoreAsync()
{
var authzValue = Request.Headers.Get("Authorization");
if (string.IsNullOrEmpty(authzValue) || !authzValue.StartsWith("Basic ", StringComparison.OrdinalIgnoreCase))
{
return null;
}
var token = authzValue.Substring("Basic ".Length).Trim();
var claimsIdentity = await TryGetPrincipalFromBasicCredentials(token, Options.CredentialValidationFunction);
if (claimsIdentity == null)
{
return null;
}
else
{
Request.User = new ClaimsPrincipal(claimsIdentity);
return new AuthenticationTicket(claimsIdentity, new AuthenticationProperties());
}
}
protected override Task ApplyResponseChallengeAsync()
{
if (Response.StatusCode == 401)
{
var challenge = Helper.LookupChallenge(Options.AuthenticationType, Options.AuthenticationMode);
if (challenge != null)
{
Response.Headers.AppendValues("WWW-Authenticate", _challenge);
}
}
return Task.FromResult<object>(null);
}
async Task<ClaimsIdentity> TryGetPrincipalFromBasicCredentials(string credentials,
BasicAuthenticationMiddleware.CredentialValidationFunction validate)
{
string pair;
try
{
pair = Encoding.UTF8.GetString(
Convert.FromBase64String(credentials));
}
catch (FormatException)
{
return null;
}
catch (ArgumentException)
{
return null;
}
var ix = pair.IndexOf(':');
if (ix == -1)
{
return null;
}
var username = pair.Substring(0, ix);
var pw = pair.Substring(ix + 1);
return await validate(username, pw);
}
Then in Startup.Auth I declare the following delegate for validating authentication (simply checks if the user exists and if the password is right and generates the associated ClaimsIdentity)
public void ConfigureAuth(IAppBuilder app)
{
app.CreatePerOwinContext(DbContext.Create);
app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
Func<string, string, Task<ClaimsIdentity>> validationCallback = (string userName, string password) =>
{
using (DbContext dbContext = new DbContext())
using(UserStore<ApplicationUser> userStore = new UserStore<ApplicationUser>(dbContext))
using(ApplicationUserManager userManager = new ApplicationUserManager(userStore))
{
var user = userManager.FindByName(userName);
if (user == null)
{
return null;
}
bool ok = userManager.CheckPassword(user, password);
if (!ok)
{
return null;
}
ClaimsIdentity claimsIdentity = userManager.CreateIdentity(user, DefaultAuthenticationTypes.ApplicationCookie);
return Task.FromResult(claimsIdentity);
}
};
var basicAuthOptions = new BasicAuthenticationOptions("KMailWebManager", new BasicAuthenticationMiddleware.CredentialValidationFunction(validationCallback));
app.UseBasicAuthentication(basicAuthOptions);
// Configure the application for OAuth based flow
PublicClientId = "self";
OAuthOptions = new OAuthAuthorizationServerOptions
{
TokenEndpointPath = new PathString("/Token"),
Provider = new ApplicationOAuthProvider(PublicClientId),
//If the AccessTokenExpireTimeSpan is changed, also change the ExpiresUtc in the RefreshTokenProvider.cs.
AccessTokenExpireTimeSpan = TimeSpan.FromHours(2),
AllowInsecureHttp = true,
RefreshTokenProvider = new RefreshTokenProvider()
};
// Enable the application to use bearer tokens to authenticate users
app.UseOAuthBearerTokens(OAuthOptions);
}
However, even with settings the Request.User in Handler's AuthenticationAsyncCore method the [Authorize] attribute does not work as expected: responding with error 401 unauthorized every time I try to use the Basic Authentication scheme.
Any idea on what is going wrong?
I found out the culprit, in the WebApiConfig.cs file the 'individual user' template inserted the following lines.
//// Web API configuration and services
//// Configure Web API to use only bearer token authentication.
config.SuppressDefaultHostAuthentication();
config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));
Thus we also have to register our BasicAuthenticationMiddleware
config.SuppressDefaultHostAuthentication();
config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));
config.Filters.Add(new HostAuthenticationFilter(BasicAuthenticationOptions.BasicAuthenticationType));
where BasicAuthenticationType is the constant string "Basic" that is passed to the base constructor of BasicAuthenticationOptions
public class BasicAuthenticationOptions : AuthenticationOptions
{
public const string BasicAuthenticationType = "Basic";
public BasicAuthenticationMiddleware.CredentialValidationFunction CredentialValidationFunction { get; private set; }
public BasicAuthenticationOptions( BasicAuthenticationMiddleware.CredentialValidationFunction validationFunction)
: base(BasicAuthenticationType)
{
CredentialValidationFunction = validationFunction;
}
}
In following this tutorial (modifying it to use an application-based auth string rather than their user model), have the following TokenValidationAttribute defined and set this attribute on WebAPI controllers in order to verify that the API request came within my web application:
public class TokenValidationAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(HttpActionContext actionContext)
{
string token;
try
{
token = actionContext.Request.Headers.GetValues("Authorization-Token").First();
}
catch (Exception)
{
actionContext.Response = new HttpResponseMessage(System.Net.HttpStatusCode.BadRequest)
{
Content = new StringContent("Missing Authorization-Token")
};
return;
}
try
{
var crypto = new SimpleCrypto.PBKDF2(); // type of encryption
var authPart = ConfigurationManager.AppSettings["AuthorizationTokenPart"];
var authSalt = GlobalVariables.AuthorizationSalt;
var authToken = GlobalVariables.AuthorizationToken;
if (authToken == crypto.Compute(authPart, authSalt))
{
// valid auth token
}
else
{
// invalid auth token
}
//AuthorizedUserRepository.GetUsers().First(x => x.Name == RSAClass.Decrypt(token));
base.OnActionExecuting(actionContext);
}
catch (Exception ex)
{
actionContext.Response = new HttpResponseMessage(System.Net.HttpStatusCode.Forbidden)
{
Content = new StringContent("Unauthorized User")
};
return;
}
}
}
In my login class, I have the following method defined that returns a User object if valid:
private User IsValid(string username, string password)
{
var crypto = new SimpleCrypto.PBKDF2(); // type of encryption
using (var db = new DAL.DbContext())
{
var user = db.Users
.Include("MembershipType")
.FirstOrDefault(u => u.UserName == username);
if (user != null && user.Password == crypto.Compute(password, user.PasswordSalt))
{
return user;
}
}
return null;
}
As you can see, the user login validation method doesn't make a WebAPI call that would be to ~/api/User (that part works).
1) How do I generate a request with with auth token (only site-generated API requests are valid)? These could be direct API calls from code-behind, or JavaScript-based (AngularJS) requests to hydrate some objects.
2) I'm not entirely clear on what base.OnActionExecuting(actionContext); . What do I do if the token is valid/invalid?
i think the best practices to send authorization header is by added it on request header
request.Headers.Add("Authorization-Token",bla bla bla);
you can create webrequest or httprequest
maybe you should start from http://rest.elkstein.org/2008/02/using-rest-in-c-sharp.html
or http://msdn.microsoft.com/en-us/library/debx8sh9%28v=vs.110%29.aspx.
in my opinion in order to create proper login security and request you should apply a standard such as openid or oauth
cheers
I did something like this, LoginSession contains my token and is static (in my case its a shared service (not static))
public HttpClient GetClient()
{
var client = new HttpClient
{
Timeout = new TimeSpan(0, 0, 2, 0),
BaseAddress = new Uri(GetServiceAddress())
};
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
if (LoginSession.Token != null)
{
client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", String.Format("Bearer {0}", LoginSession.Token.AccessToken));
}
return client;
}
notice this line:
client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", String.Format("Bearer {0}", LoginSession.Token.AccessToken));
I'm having an issue implementing custom OAuth2Client for google using DotNetOpenAuth and MVC4.
I've got to the point where I can successfully make the authorization request to the google endpoint
https://accounts.google.com/o/oauth2/auth
and Google asks if the user will allow my application access to their account. All good so far. When the user clicks 'OK', google then calls my callback URL as expected.
The problem is when I call the VerifyAuthentication method on the OAuthWebSecurity class (Microsoft.Web.WebPages.OAuth)
var authenticationResult = OAuthWebSecurity.VerifyAuthentication(Url.Action("ExternalLoginCallback", new { ReturnUrl = returnUrl }));
It's always returning an AuthenticationResult with IsSuccessful = false and Provider = ""
I've looked into the code for this, and the OAuthWebSecurity class tries to get the Provider name from
Request.QueryString["__provider__"]
but Google is not sending this information back in the querystring. The other provider I have implemented (LinkedIn) is sending the provider name back and it all works just fine.
I'm not sure what I can do from this point, apart from abandon the Microsoft.Web.WebPages.OAuth classes and just use DotNetOpenAuth without them, but I was hoping someone might have another solution I can try...
I've searched extensively, but can't seem to find anything to help ... I've found it really difficult even just to find examples of people doing the same thing, which has really surprised me.
Any help much appreciated!
Update: As Matt Johnson mentions below he has packaged up a solution to this which you can get from GitHub: https://github.com/mj1856/DotNetOpenAuth.GoogleOAuth2
As he notes:
DNOA and OAuthWebSecurity for ASP.Net MVC 4 ship with only an OpenId provider for Google. This is an OAuth2 client that you can use instead.
IMPORTANT - If you are using ASP.Net MVC 5, this package is not applicable. You should use Microsoft.Owin.Security.Google instead. (It also ships with the MVC 5 starter templates in VS 2013.)
I got round this in the end by catching the request when it comes in, and doing my own check to see which provider it has come from. Google allow you to send a parameter to the OAuth request called 'state', which they simply pass straight back to you when they make the callback, so I'm using this to pass the provider name for google, and I check for this in the absence of the "__provider__".
something like this:
public String GetProviderNameFromQueryString(NameValueCollection queryString)
{
var result = queryString["__provider__"];
if (String.IsNullOrWhiteSpace(result))
{
result = queryString["state"];
}
return result;
}
I've then implemented a custom OAuth2Client for Google, and I manually call the VerifyAuthentication method on that myself, bypassing the Microsoft wrapper stuff.
if (provider is GoogleCustomClient)
{
authenticationResult = ((GoogleCustomClient)provider).VerifyAuthentication(context, new Uri(String.Format("{0}/oauth/ExternalLoginCallback", context.Request.Url.GetLeftPart(UriPartial.Authority).ToString())));
}
else
{
authenticationResult = OAuthWebSecurity.VerifyAuthentication(returnUrl);
}
This has allowed me to keep the stuff I already had in place for the other providers using the Microsoft wrappers.
As requested by #1010100 1001010, here is my custom OAuth2Client for Google (NOTE: IT NEEDS SOME TIDYING! I HAVEN'T GOT ROUND TO TIDYING THE CODE UP YET. It does work though) :
public class GoogleCustomClient : OAuth2Client
{
ILogger _logger;
#region Constants and Fields
/// <summary>
/// The authorization endpoint.
/// </summary>
private const string AuthorizationEndpoint = "https://accounts.google.com/o/oauth2/auth";
/// <summary>
/// The token endpoint.
/// </summary>
private const string TokenEndpoint = "https://accounts.google.com/o/oauth2/token";
/// <summary>
/// The _app id.
/// </summary>
private readonly string _clientId;
/// <summary>
/// The _app secret.
/// </summary>
private readonly string _clientSecret;
#endregion
public GoogleCustomClient(string clientId, string clientSecret)
: base("Google")
{
if (string.IsNullOrWhiteSpace(clientId)) throw new ArgumentNullException("clientId");
if (string.IsNullOrWhiteSpace(clientSecret)) throw new ArgumentNullException("clientSecret");
_logger = ObjectFactory.GetInstance<ILogger>();
this._clientId = clientId;
this._clientSecret = clientSecret;
}
protected override Uri GetServiceLoginUrl(Uri returnUrl)
{
StringBuilder serviceUrl = new StringBuilder();
serviceUrl.AppendFormat("{0}?scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile", AuthorizationEndpoint);
serviceUrl.Append("&state=google");
serviceUrl.AppendFormat("&redirect_uri={0}", returnUrl.ToString());
serviceUrl.Append("&response_type=code");
serviceUrl.AppendFormat("&client_id={0}", _clientId);
return new Uri(serviceUrl.ToString());
}
protected override IDictionary<string, string> GetUserData(string accessToken)
{
RestClient client = new RestClient("https://www.googleapis.com");
var request = new RestRequest(String.Format("/oauth2/v1/userinfo?access_token={0}", accessToken), Method.GET);
IDictionary<String, String> extraData = new Dictionary<String, String>();
var response = client.Execute(request);
if (null != response.ErrorException)
{
return null;
}
else
{
try
{
var json = JObject.Parse(response.Content);
string firstName = (string)json["given_name"];
string lastName = (string)json["family_name"];
string emailAddress = (string)json["email"];
string id = (string)json["id"];
extraData = new Dictionary<String, String>
{
{"accesstoken", accessToken},
{"name", String.Format("{0} {1}", firstName, lastName)},
{"firstname", firstName},
{"lastname", lastName},
{"email", emailAddress},
{"id", id}
};
}
catch(Exception ex)
{
_logger.Error("Error requesting OAuth user data from Google", ex);
return null;
}
return extraData;
}
}
protected override string QueryAccessToken(Uri returnUrl, string authorizationCode)
{
StringBuilder postData = new StringBuilder();
postData.AppendFormat("client_id={0}", this._clientId);
postData.AppendFormat("&redirect_uri={0}", HttpUtility.UrlEncode(returnUrl.ToString()));
postData.AppendFormat("&client_secret={0}", this._clientSecret);
postData.AppendFormat("&grant_type={0}", "authorization_code");
postData.AppendFormat("&code={0}", authorizationCode);
string response = "";
string accessToken = "";
var webRequest = (HttpWebRequest)WebRequest.Create(TokenEndpoint);
webRequest.Method = "POST";
webRequest.ContentType = "application/x-www-form-urlencoded";
try
{
using (Stream s = webRequest.GetRequestStream())
{
using (StreamWriter sw = new StreamWriter(s))
sw.Write(postData.ToString());
}
using (WebResponse webResponse = webRequest.GetResponse())
{
using (StreamReader reader = new StreamReader(webResponse.GetResponseStream()))
{
response = reader.ReadToEnd();
}
}
var json = JObject.Parse(response);
accessToken = (string)json["access_token"];
}
catch(Exception ex)
{
_logger.Error("Error requesting OAuth access token from Google", ex);
return null;
}
return accessToken;
}
public override AuthenticationResult VerifyAuthentication(HttpContextBase context, Uri returnPageUrl)
{
string code = context.Request.QueryString["code"];
if (string.IsNullOrEmpty(code))
{
return AuthenticationResult.Failed;
}
string accessToken = this.QueryAccessToken(returnPageUrl, code);
if (accessToken == null)
{
return AuthenticationResult.Failed;
}
IDictionary<string, string> userData = this.GetUserData(accessToken);
if (userData == null)
{
return AuthenticationResult.Failed;
}
string id = userData["id"];
string name;
// Some oAuth providers do not return value for the 'username' attribute.
// In that case, try the 'name' attribute. If it's still unavailable, fall back to 'id'
if (!userData.TryGetValue("username", out name) && !userData.TryGetValue("name", out name))
{
name = id;
}
// add the access token to the user data dictionary just in case page developers want to use it
userData["accesstoken"] = accessToken;
return new AuthenticationResult(
isSuccessful: true, provider: this.ProviderName, providerUserId: id, userName: name, extraData: userData);
}
You can add a provider query parameter to the end of your callback url.
e.g. https://mywebsite.com/Account/ExternalLoginCallback?provider=google
The you will get it and you don't need the work around.
I can create a WCF REST service and POST, PUT and GET data OK.
How do I access the request body in XML format on the service side to send to an SQL database?
You can actually pass arguments to to your web methods using this attribute
[WebGet(UriTemplate = "users/{username}")]
here is a sample method from msdn
[WebGet(UriTemplate = "users/{username}")]
[OperationContract]
User GetUserAccount(string username)
{
if (!IsUserAuthorized(username))
{
WebOperationContext.Current.OutgoingResponse.StatusCode =
HttpStatusCode.Unauthorized;
return;
}
User user = FindUser(username);
if (user == null)
{
WebOperationContext.Current.OutgoingResponse.SetStatusAsNotFound();
return null;
}
return user;
}
In MVC3, the Request object is available in the controller, with the content of the body being available in the InputStream object. This code worked for me:
this.Request.InputStream.Position = 0;
var xmlContent = new System.IO.StreamReader(this.Request.InputStream).ReadToEnd();
Hope that helps.