public bool TryCreateDeviceAuthChallengeResponseAsync(HttpResponseHeaders responseHeaders, Uri endpointUri, out string responseHeader)
{
responseHeader = string.Empty;
string authHeaderTemplate = "PKeyAuth {0}, Context=\"{1}\", Version=\"{2}\"";
X509Certificate2 certificate = null;
if (!DeviceAuthHelper.IsDeviceAuthChallenge(responseHeaders))
{
return(false);
}
if (!DeviceAuthHelper.CanOSPerformPKeyAuth())
{
responseHeader = DeviceAuthHelper.GetBypassChallengeResponse(responseHeaders);
return(true);
}
IDictionary <string, string> challengeData = DeviceAuthHelper.ParseChallengeData(responseHeaders);
if (!challengeData.ContainsKey("SubmitUrl"))
{
challengeData["SubmitUrl"] = endpointUri.AbsoluteUri;
}
try
{
certificate = FindCertificate(challengeData);
}
catch (MsalException ex)
{
if (ex.ErrorCode == MsalError.DeviceCertificateNotFound)
{
responseHeader = DeviceAuthHelper.GetBypassChallengeResponse(responseHeaders);
return(true);
}
}
DeviceAuthJWTResponse responseJWT = new DeviceAuthJWTResponse(challengeData["SubmitUrl"],
challengeData["nonce"], Convert.ToBase64String(certificate.GetRawCertData()));
CngKey key = NetDesktopCryptographyManager.GetCngPrivateKey(certificate);
byte[] sig = null;
using (Native.RSACng rsa = new Native.RSACng(key))
{
rsa.SignatureHashAlgorithm = CngAlgorithm.Sha256;
sig = rsa.SignData(responseJWT.GetResponseToSign().ToByteArray());
}
string signedJwt = string.Format(CultureInfo.InvariantCulture, "{0}.{1}", responseJWT.GetResponseToSign(),
Base64UrlHelpers.Encode(sig));
string authToken = string.Format(CultureInfo.InvariantCulture, " AuthToken=\"{0}\"", signedJwt);
responseHeader = string.Format(CultureInfo.InvariantCulture, authHeaderTemplate, authToken,
challengeData["Context"],
challengeData["Version"]);
return(true);
}
public void CheckIfResponseIsDeviceAuthChallenge()
{
//Act
bool successResponse = DeviceAuthHelper.IsDeviceAuthChallenge(s_httpResponse.Headers);
bool failedResponse = DeviceAuthHelper.IsDeviceAuthChallenge((new HttpResponse()).Headers);
//Assert
Assert.IsTrue(successResponse);
Assert.IsFalse(failedResponse);
}
public bool TryCreateDeviceAuthChallengeResponseAsync(HttpResponseHeaders headers, Uri endpointUri, out string responseHeader)
{
responseHeader = string.Empty;
Certificate certificate = null;
string authHeaderTemplate = "PKeyAuth {0}, Context=\"{1}\", Version=\"{2}\"";
if (!DeviceAuthHelper.IsDeviceAuthChallenge(headers))
{
return(false);
}
if (!DeviceAuthHelper.CanOSPerformPKeyAuth())
{
responseHeader = DeviceAuthHelper.GetBypassChallengeResponse(headers);
return(false);
}
IDictionary <string, string> challengeData = DeviceAuthHelper.ParseChallengeData(headers);
if (!challengeData.ContainsKey("SubmitUrl"))
{
challengeData["SubmitUrl"] = endpointUri.AbsoluteUri;
}
try
{
certificate = Task.FromResult(FindCertificateAsync(challengeData)).Result.Result;
}
catch (MsalException ex)
{
if (ex.ErrorCode == MsalError.DeviceCertificateNotFound)
{
responseHeader = DeviceAuthHelper.GetBypassChallengeResponse(headers);
return(true);
}
}
DeviceAuthJWTResponse responseJWT = new DeviceAuthJWTResponse(challengeData["SubmitUrl"],
challengeData["nonce"], Convert.ToBase64String(certificate.GetCertificateBlob().ToArray()));
IBuffer input = CryptographicBuffer.ConvertStringToBinary(responseJWT.GetResponseToSign(),
BinaryStringEncoding.Utf8);
CryptographicKey keyPair =
Task.FromResult(PersistedKeyProvider.OpenKeyPairFromCertificateAsync(certificate, HashAlgorithmNames.Sha256, CryptographicPadding.RsaPkcs1V15)).Result.GetResults();
IBuffer signed = Task.FromResult(CryptographicEngine.SignAsync(keyPair, input)).Result.GetResults();
string signedJwt = string.Format(CultureInfo.InvariantCulture, "{0}.{1}", responseJWT.GetResponseToSign(),
Base64UrlHelpers.Encode(signed.ToArray()));
string authToken = string.Format(CultureInfo.InvariantCulture, " AuthToken=\"{0}\"", signedJwt);
responseHeader = string.Format(CultureInfo.InvariantCulture, authHeaderTemplate, authToken, challengeData["Context"], challengeData["Version"]);
return(true);
}