public void GetAsymmetricAlgorithm ()
{
X509AsymmetricSecurityKey key = new X509AsymmetricSecurityKey (cert);
string name = EncryptedXml.XmlEncRSA15Url;
AsymmetricAlgorithm alg = key.GetAsymmetricAlgorithm (name, false);
Assert.IsNotNull (alg, "#1");
alg = key.GetAsymmetricAlgorithm (name, true);
Assert.IsNotNull (alg, "#2");
key = new X509AsymmetricSecurityKey (cert2);
alg = key.GetAsymmetricAlgorithm (name, false);
Assert.IsNotNull (alg, "#3");
}
public byte[] SignWithCertificate(string message, byte[] rawData, string password)
{
X509Certificate2 x509Certificate = new X509Certificate2(rawData, password);
if (x509Certificate.PublicKey.Key.KeySize < ClientAssertionCertificate.MinKeySizeInBits)
{
throw new ArgumentOutOfRangeException("rawData",
string.Format(CultureInfo.InvariantCulture, AdalErrorMessage.CertificateKeySizeTooSmallTemplate, ClientAssertionCertificate.MinKeySizeInBits));
}
X509AsymmetricSecurityKey x509Key = new X509AsymmetricSecurityKey(x509Certificate);
RSACryptoServiceProvider rsa = x509Key.GetAsymmetricAlgorithm(SecurityAlgorithms.RsaSha256Signature, true) as RSACryptoServiceProvider;
RSACryptoServiceProvider newRsa = null;
try
{
newRsa = GetCryptoProviderForSha256(rsa);
using (SHA256Cng sha = new SHA256Cng())
{
return newRsa.SignData(Encoding.UTF8.GetBytes(message), sha);
}
}
finally
{
if (newRsa != null && !ReferenceEquals(rsa, newRsa))
{
newRsa.Dispose();
}
}
}
public static byte[] SignWithCertificate(string message, X509Certificate2 x509Certificate)
{
X509AsymmetricSecurityKey x509Key = new X509AsymmetricSecurityKey(x509Certificate);
RSACryptoServiceProvider rsa = x509Key.GetAsymmetricAlgorithm(SecurityAlgorithms.RsaSha256Signature, true) as RSACryptoServiceProvider;
RSACryptoServiceProvider newRsa = null;
try
{
newRsa = GetCryptoProviderForSha256(rsa);
using (SHA256Cng sha = new SHA256Cng())
{
return newRsa.SignData(Encoding.UTF8.GetBytes(message), sha);
}
}
finally
{
if (newRsa != null && !object.ReferenceEquals(rsa, newRsa))
{
newRsa.Dispose();
}
}
}
[Category ("NotDotNet")] // buggy FormatException occurs instead
public void GetAsymmetricAlgorithmHMACSHA1 ()
{
X509AsymmetricSecurityKey key = new X509AsymmetricSecurityKey (cert);
key.GetAsymmetricAlgorithm (SignedXml.XmlDsigHMACSHA1Url, false);
}
public void GetAsymmetricAlgorithmDSA ()
{
X509AsymmetricSecurityKey key = new X509AsymmetricSecurityKey (cert);
AsymmetricAlgorithm alg = key.GetAsymmetricAlgorithm (SignedXml.XmlDsigDSAUrl, false);
}
[Category ("NotDotNet")] // buggy FormatException occurs instead
public void GetAsymmetricAlgorithmNullAlgName ()
{
X509AsymmetricSecurityKey key = new X509AsymmetricSecurityKey (cert);
key.GetAsymmetricAlgorithm (null, false);
}
public void GetAsymmetricAlgorithmWhereNoPrivKey ()
{
X509AsymmetricSecurityKey key = new X509AsymmetricSecurityKey (cert2);
key.GetAsymmetricAlgorithm (EncryptedXml.XmlEncRSA15Url, true);
}
/// <summary>
/// Sign the data with the X509Certificate
/// </summary>
/// <param name="signingCertificate">Signing certificate.</param>
/// <param name="data">Data to be signed.</param>
/// <returns>RSA SHA 256 Signature</returns>
public static byte[] SignData(X509Certificate2 signingCertificate, string data)
{
X509AsymmetricSecurityKey securityKey = new X509AsymmetricSecurityKey(signingCertificate);
RSACryptoServiceProvider rsa =
securityKey.GetAsymmetricAlgorithm("http://www.w3.org/2001/04/xmldsig-more#rsa-sha256", true)
as RSACryptoServiceProvider;
if (!signingCertificate.HasPrivateKey)
{
throw new ArgumentException(string.Format(
"Private key is not found in the certificate: {0}",
signingCertificate.Subject));
}
if (rsa != null)
{
rsa.FromXmlString(signingCertificate.PrivateKey.ToXmlString(true));
if (rsa.CspKeyContainerInfo.ProviderType != 24)
{
System.Security.Cryptography.CspParameters cspParameters =
new System.Security.Cryptography.CspParameters
{
ProviderType = 24,
KeyContainerName = rsa.CspKeyContainerInfo.KeyContainerName,
KeyNumber = (int) rsa.CspKeyContainerInfo.KeyNumber
};
if (rsa.CspKeyContainerInfo.MachineKeyStore)
{
cspParameters.Flags = CspProviderFlags.UseMachineKeyStore;
}
rsa = new System.Security.Cryptography.RSACryptoServiceProvider(cspParameters);
}
}
HashAlgorithm hashAlgo = System.Security.Cryptography.SHA256.Create();
byte[] signatureInBytes = rsa.SignData(Encoding.UTF8.GetBytes(data), hashAlgo);
return signatureInBytes;
}
// Get the access token via straight http post request doing client credential flow
private async Task<String> GetAppOnlyAccessTokenWithHttpRequest(string resource, string tenantId)
{
/**
* use the tenant specific endpoint for requesting the app-only access token
*/
string tokenIssueEndpoint = appConfig.TokenIssueingUri.Replace("common", tenantId);
/**
* sign the assertion with the private key
*/
string certfile = Server.MapPath(appConfig.ClientCertificatePfx);
X509Certificate2 cert = new X509Certificate2(
certfile,
appConfig.ClientCertificatePfxPassword,
X509KeyStorageFlags.MachineKeySet);
/**
* Example building assertion using Json Tokenhandler.
* Sort of cheating, but just if someone wonders ... there are always more ways to do something :-)
*/
Dictionary<string, string> claims = new Dictionary<string, string>()
{
{ "sub", appConfig.ClientId },
{ "jti", Guid.NewGuid().ToString() },
};
JwtSecurityTokenHandler tokenHandler = new JwtSecurityTokenHandler();
X509SigningCredentials signingCredentials = new X509SigningCredentials(cert, SecurityAlgorithms.RsaSha256Signature, SecurityAlgorithms.Sha256Digest);
JwtSecurityToken selfSignedToken = new JwtSecurityToken(
appConfig.ClientId,
tokenIssueEndpoint,
claims.Select(c => new Claim(c.Key, c.Value)),
DateTime.UtcNow,
DateTime.UtcNow.Add(TimeSpan.FromMinutes(15)),
signingCredentials);
string signedAssertion = tokenHandler.WriteToken(selfSignedToken);
//---- End example with Json Tokenhandler... now to the fun part doing it all ourselves ...
/**
* Example building assertion from scratch with Crypto APIs
*/
JObject clientAssertion = new JObject();
clientAssertion.Add("aud", tokenIssueEndpoint);
clientAssertion.Add("iss", appConfig.ClientId);
clientAssertion.Add("sub", appConfig.ClientId);
clientAssertion.Add("jti", Guid.NewGuid().ToString());
clientAssertion.Add("nbf", WebConvert.EpocTime(DateTime.UtcNow + TimeSpan.FromMinutes(-5)));
clientAssertion.Add("exp", WebConvert.EpocTime(DateTime.UtcNow + TimeSpan.FromMinutes(15)));
string assertionPayload = clientAssertion.ToString(Newtonsoft.Json.Formatting.None);
X509AsymmetricSecurityKey x509Key = new X509AsymmetricSecurityKey(cert);
RSACryptoServiceProvider rsa = x509Key.GetAsymmetricAlgorithm(SecurityAlgorithms.RsaSha256Signature, true) as RSACryptoServiceProvider;
RSACryptoServiceProvider newRsa = GetCryptoProviderForSha256(rsa);
SHA256Cng sha = new SHA256Cng();
JObject header = new JObject(new JProperty("alg", "RS256"));
string thumbprint = WebConvert.Base64UrlEncoded(WebConvert.HexStringToBytes(cert.Thumbprint));
header.Add(new JProperty("x5t", thumbprint));
string encodedHeader = WebConvert.Base64UrlEncoded(header.ToString());
string encodedPayload = WebConvert.Base64UrlEncoded(assertionPayload);
string signingInput = String.Concat(encodedHeader, ".", encodedPayload);
byte[] signature = newRsa.SignData(Encoding.UTF8.GetBytes(signingInput), sha);
signedAssertion = string.Format("{0}.{1}.{2}",
encodedHeader,
encodedPayload,
WebConvert.Base64UrlEncoded(signature));
/**
* build the request payload
*/
FormUrlEncodedContent tokenRequestForm;
tokenRequestForm = new FormUrlEncodedContent(
new[] {
new KeyValuePair<string,string>("resource", appConfig.ExchangeResourceUri),
new KeyValuePair<string,string>("client_id", appConfig.ClientId),
new KeyValuePair<string,string>("client_assertion_type", "urn:ietf:params:oauth:client-assertion-type:jwt-bearer"),
new KeyValuePair<string,string>("client_assertion", signedAssertion),
new KeyValuePair<string,string>("grant_type","client_credentials"),
}
);
/*
* Do the web request
*/
HttpClient client = new HttpClient();
Task<string> requestString = tokenRequestForm.ReadAsStringAsync();
StringContent requestContent = new StringContent(requestString.Result);
requestContent.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
requestContent.Headers.Add("client-request-id", System.Guid.NewGuid().ToString());
requestContent.Headers.Add("return-client-request-id", "true");
requestContent.Headers.Add("UserAgent", "MatthiasLeibmannsAppOnlyAppSampleBeta/0.1");
HttpResponseMessage response = client.PostAsync(tokenIssueEndpoint, requestContent).Result;
JObject jsonResponse = JObject.Parse(response.Content.ReadAsStringAsync().Result);
JsonSerializer jsonSerializer = new JsonSerializer();
if(response.IsSuccessStatusCode == true)
{
AADClientCredentialSuccessResponse s = (AADClientCredentialSuccessResponse)jsonSerializer.Deserialize(new JTokenReader(jsonResponse), typeof(AADClientCredentialSuccessResponse));
return s.access_token;
}
AADClientCredentialErrorResponse e = (AADClientCredentialErrorResponse)jsonSerializer.Deserialize(new JTokenReader(jsonResponse), typeof(AADClientCredentialErrorResponse));
throw new Exception(e.error_description);
}
