public void VerifySignature()
{
var toSign = new Dictionary<string, string> { { "a", "xyz" }, { "b", "1234567890" }, { "c", Convert.ToBase64String(Current.Random(16)) }, { "d", "false" } };
var sig = GetSignature("/some/dummy/path", toSign);
var fakeAffiliate = new Affiliate { VerificationModulus = "zB3eUr66GkFESizQCnjrm1jCbhHW/vy2UoCHAMIlsOweMOnbU2y8IohlRBEBaS80CqAPlRNfjtRjzdZU3F+J/lUZqipH5sZjXyE6/rPXbvp3tlRSF0pgcQDlFYmAQWKbPKwt2PCg8/Od+wI7cBnHEfveRTjzMzfeFUzoWPiYEo0=" };
var clock = new Stopwatch();
clock.Start();
for (int i = 0; i < 100000; i++)
{
Assert.IsTrue(fakeAffiliate.ConfirmSignature(sig, "/some/dummy/path", toSign), "Signature didn't pass and should have");
}
clock.Stop();
Assert.IsTrue(clock.Elapsed < TimeSpan.FromSeconds(120), "100k in 30s [" + clock.Elapsed + "]");
}
public void ValidCallback()
{
var affiliate = new Affiliate { HostFilter = "dev.stackoverflow.com" };
Assert.IsTrue(affiliate.IsValidCallback("http://dev.stackoverflow.com/blah-blah-blah"));
Assert.IsTrue(affiliate.IsValidCallback("http://dev.stackoverflow.com/blah-blah-blah/more-blah"));
Assert.IsTrue(affiliate.IsValidCallback("http://dev.stackoverflow.com/blah-blah-blah/more-blah?param=yesyes"));
Assert.IsTrue(affiliate.IsValidCallback("http://dev.stackoverflow.com/blah-blah-blah/more-blah?param=yesyes&indeed=nono"));
affiliate = new Affiliate { HostFilter = "dev.*.stackexchange.com" };
Assert.IsTrue(affiliate.IsValidCallback("http://dev.webapps.stackexchange.com/blah-blah-blah"));
Assert.IsTrue(affiliate.IsValidCallback("http://dev.webapps.stackexchange.com/blah-blah-blah/more-blah"));
Assert.IsTrue(affiliate.IsValidCallback("http://dev.webapps.stackexchange.com/blah-blah-blah/more-blah?param=yesyes"));
Assert.IsTrue(affiliate.IsValidCallback("http://dev.webapps.stackexchange.com/blah-blah-blah/more-blah?param=yesyes&indeed=nono"));
}
public void InvalidCallback()
{
var affiliate = new Affiliate { HostFilter = "dev.stackoverflow.com" };
Assert.IsFalse(affiliate.IsValidCallback("http://dev.stackexchange.com/blah-blah-blah"));
Assert.IsFalse(affiliate.IsValidCallback("http://dev.superuser.com/blah-blah-blah/more-blah"));
Assert.IsFalse(affiliate.IsValidCallback("http://dev.etc.com/blah-blah-blah/more-blah?param=yesyes"));
Assert.IsFalse(affiliate.IsValidCallback("http://example.com?indeed=http://dev.stackoverflow.com/"));
affiliate = new Affiliate { HostFilter = "dev.*.stackexchange.com" };
Assert.IsFalse(affiliate.IsValidCallback("http://other.stackexchange.com/blah-blah-blah"));
Assert.IsFalse(affiliate.IsValidCallback("http://stackexchange.com/blah-blah-blah/more-blah"));
Assert.IsFalse(affiliate.IsValidCallback("http://dev.stackexchange.com/blah-blah-blah/more-blah?param=yesyes"));
Assert.IsFalse(affiliate.IsValidCallback("http://dev.stackoverflow.com/"));
affiliate = new Affiliate { HostFilter = "*.stackexchange.com" };
Assert.IsFalse(affiliate.IsValidCallback("http://one.two.stackexchange.com/"));
}
partial void DeleteAffiliate(Affiliate instance);
partial void UpdateAffiliate(Affiliate instance);
partial void InsertAffiliate(Affiliate instance);
public ActionResult CreateAffiliate(string filter)
{
if (!Affiliate.IsValidFilter(filter)) return RecoverableError("Invalid host filter", new { filter });
var c = new RSACryptoServiceProvider();
var key = c.ExportParameters(true);
// meeeh... it would be nice if there were a way to *fix* the exponent. May just need to store it...
for (int i = 0; i < key.Exponent.Length; i++)
if (key.Exponent[i] != Affiliate.FixedExponent[i])
throw new Exception("Exponent not as expected!");
var modulus = Convert.ToBase64String(key.Modulus);
var now = Current.Now;
var newAffiliate = new Affiliate
{
CreationDate = now,
HostFilter = filter,
OwnerUserId = Current.LoggedInUser.Id,
VerificationModulus = modulus
};
Current.LoggedInUser.LastActivityDate = now;
Current.WriteDB.Affiliates.InsertOnSubmit(newAffiliate);
Current.WriteDB.SubmitChanges();
// This is your key, don't lose it!
var jsonKey =
Json(
new
{
D = Convert.ToBase64String(key.D),
DP = Convert.ToBase64String(key.DP),
DQ = Convert.ToBase64String(key.DQ),
InverseQ = Convert.ToBase64String(key.InverseQ),
Modulus = Convert.ToBase64String(key.Modulus),
P = Convert.ToBase64String(key.P),
Q = Convert.ToBase64String(key.Q)
});
var success =
Current.Email.SendEmail(
Current.LoggedInUser.Email,
Email.Template.AffiliateRegistered,
new
{
D = Convert.ToBase64String(key.D),
DP = Convert.ToBase64String(key.DP),
DQ = Convert.ToBase64String(key.DQ),
InverseQ = Convert.ToBase64String(key.InverseQ),
Modulus = Convert.ToBase64String(key.Modulus),
P = Convert.ToBase64String(key.P),
Q = Convert.ToBase64String(key.Q),
Id = newAffiliate.Id,
Host = newAffiliate.HostFilter
});
if (!success)
{
return IrrecoverableError("An error occurred sending the email", "This has been recorded, and will be looked into shortly");
}
return jsonKey;
}
/// <summary>
/// Returns true if the parameters contain a valid signature for a request.
/// </summary>
private static bool VerifySignature(Dictionary<string, string> @params, out Affiliate validFor, out string failureReason)
{
if ([email protected]("authCode") || [email protected]("affId") || [email protected]("nonce"))
{
validFor = null;
failureReason = "Missing parameter";
return false;
}
validFor = null;
var authCode = @params["authCode"].ToString();
int affId;
if (!int.TryParse(@params["affId"], out affId))
{
failureReason = "No affId";
return false;
}
var nonce = @params["nonce"].ToString();
string nonceMsg;
if (!Nonces.IsValid(nonce, Current.RemoteIP, out nonceMsg))
{
failureReason = "Invalid Nonce [" + nonceMsg + "]";
return false;
}
var affiliate = Current.ReadDB.Affiliates.SingleOrDefault(a => a.Id == affId);
if (affiliate == null)
{
failureReason = "Could not find affiliate";
return false;
}
var copy = new Dictionary<string, string>();
foreach (var item in @params.Keys.Where(k => k != "authCode"))
{
copy[item] = @params[item];
}
if (authCode.HasValue() && !affiliate.ConfirmSignature(authCode, Current.RequestUri.AbsolutePath, copy))
{
failureReason = "Affiliate signature confirmation failed";
return false;
}
validFor = affiliate;
Nonces.MarkUsed(nonce, Current.RemoteIP);
failureReason = null;
return true;
}
/// <summary>
/// We greatly restrict access to this controller.
///
/// It can only be entered with a request signed by a registered affiliate.
/// That is, all GETs must carry a signed authCode. All POSTs are protected by
/// our standard XSRF tricks.
/// </summary>
protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
Current.NoCache = true;
if (Current.PostExpectedAndNotReceived)
{
Current.ShouldBustFrames = false;
filterContext.Result = PostExpectedAndNotReceived();
return;
}
var @params = new Dictionary<string, string>();
foreach (var x in filterContext.HttpContext.Request.QueryString.AllKeys)
{
@params[x] = filterContext.HttpContext.Request.QueryString[x];
}
if ([email protected]("affId") && Request.Form.AllKeys.Contains("affId"))
{
@params["affId"] = Request.Form["affId"];
}
var method = filterContext.HttpContext.Request.HttpMethod;
string failureReason = null;
var failure = false;
if ([email protected]("affId"))
{
failureReason = "No affId";
failure = true;
}
// OK, this is tricky so pay attention
if (!failure)
{
ViewData["affId"] = @params["affId"];
// Anything that's a GET in this controller comes from an affiliate
// that means the whole thing needs to be signed (all parameters)
if (method == "GET")
{
// HACK: Ok, we need *one* exception to all this chicanery, so we're just
// hacking it in here
var reqUrl = filterContext.RouteData.Route as System.Web.Routing.Route;
if (reqUrl != null && reqUrl.Url == "affiliate/form/switch")
{
int affId;
if (int.TryParse(@params["affId"], out affId))
{
CurrentAffiliate = Current.ReadDB.Affiliates.SingleOrDefault(a => a.Id == affId);
if (CurrentAffiliate != null)
{
Current.ShouldBustFrames = false;
base.OnActionExecuting(filterContext);
return;
}
}
}
else
{
// For all other routes, confirm that they came from a registered affiliate
if ([email protected]("nonce"))
{
failureReason = "No Nonce";
failure = true;
}
if ([email protected]("authCode"))
{
failureReason = "No Auth Code";
failure = true;
}
string sigError;
if(!VerifySignature(@params, out CurrentAffiliate, out sigError))
{
failure = true;
failureReason = "Signature invalid - " + sigError;
}
}
}
else if (method == "POST")
{
// Anything that's a POST comes from our own forms (in iframes)
// We know this because of the XSRF token.
CurrentAffiliate = Current.ReadDB.Affiliates.SingleOrDefault(a => a.Id == int.Parse(@params["affId"].ToString()));
if (CurrentAffiliate == null)
{
failure = true;
failureReason = "On Post, invalid affId";
}
}
else
{
// ... and anything else is a garbage request
failure = true;
failureReason = " Not GET or POST";
}
}
Current.ShouldBustFrames = false; // no frame busting in this controller
if (failure)
{
Current.LogException(new Exception("Affiliate Forms failure: " + failureReason));
filterContext.Result = IrrecoverableErrorWithHelp("Affiliate Form failure:", failureReason);
return;
}
var formCanaryCookie = new HttpCookie("canary", "1");
formCanaryCookie.HttpOnly = false; // the whole point is to check for this via javascript
formCanaryCookie.Expires = Current.Now + TimeSpan.FromMinutes(5);
filterContext.HttpContext.Response.Cookies.Add(formCanaryCookie);
base.OnActionExecuting(filterContext);
}
