public static IEnumerable <SecurityKey> GetEmbeddedSecurityKeys(this Saml2SecurityToken saml)
{
if (saml?.Assertion?.Signature?.KeyInfo == null)
{
Enumerable.Empty <SecurityKey>();
}
return(saml.Assertion.Signature.KeyInfo.GetSecurityKeys());
}
private static void AddAuthenticationStatement(Microsoft.IdentityModel.Tokens.Saml2.Saml2SecurityToken token)
{
// Chage to "urn:oasis:names:tc:SAML:2.0:ac:classes:Password" or something.
var authenticationMethod = "urn:none";
var authenticationContext = new Microsoft.IdentityModel.Tokens.Saml2.Saml2AuthenticationContext(new Uri(authenticationMethod));
var authenticationStatement = new Microsoft.IdentityModel.Tokens.Saml2.Saml2AuthenticationStatement(authenticationContext);
token.Assertion.Statements.Add(authenticationStatement);
}
public static void SetNotOnOrAfter(this Saml2SecurityToken token, DateTime?notOnOrAfter)
{
var data = token.GetBearerSubjectConfirmationData();
if (data == null)
{
return;
}
data.NotOnOrAfter = notOnOrAfter;
}
private static void AddConfirmationData(Microsoft.IdentityModel.Tokens.Saml2.Saml2SecurityToken token)
{
var confirmationData = new Microsoft.IdentityModel.Tokens.Saml2.Saml2SubjectConfirmationData
{
Recipient = new Uri(assertionConsumerEndpoint),
NotOnOrAfter = DateTime.UtcNow.AddMinutes(tokenLifetime),
};
token.Assertion.Subject.SubjectConfirmations.Add(new Microsoft.IdentityModel.Tokens.Saml2.Saml2SubjectConfirmation(
Saml2Constants.ConfirmationMethods.Bearer, confirmationData));
}
public static void SetRecipient(this Saml2SecurityToken token, Uri recipient, Saml2Id inResponseTo)
{
var data = token.GetBearerSubjectConfirmationData();
if (data == null)
{
return;
}
data.Recipient = recipient;
data.InResponseTo = inResponseTo;
}
static Saml2SubjectConfirmationData GetBearerSubjectConfirmationData(this Saml2SecurityToken token)
{
var confirmation = token.Assertion.Subject.SubjectConfirmations.FirstOrDefault(c => c.Method == Saml2Constants.ConfirmationMethods.Bearer);
if (confirmation == null)
{
token.Assertion.Subject.SubjectConfirmations.Add(confirmation = new Saml2SubjectConfirmation(Saml2Constants.ConfirmationMethods.Bearer));
}
if (confirmation.SubjectConfirmationData == null)
{
confirmation.SubjectConfirmationData = new Saml2SubjectConfirmationData();
}
return(confirmation.SubjectConfirmationData);
}
public static void ValidateResponseToken(this Saml2SecurityToken token, string authnRequestId, DateTime now)
{
var data = token.GetBearerSubjectConfirmationData();
if (data == null)
{
throw new SecurityException("Missing bearer subject confirmation data.");
}
if (data.InResponseTo?.Value != authnRequestId)
{
throw new SecurityException($"Invalid InResponseTo. Expected '{authnRequestId}' but got '{data.InResponseTo?.Value}'.");
}
if (data.NotBefore != null && now < data.NotBefore)
{
throw new SecurityException($"NotBefore validation failed.");
}
if (data.NotOnOrAfter != null && data.NotOnOrAfter <= now)
{
throw new SecurityException($"NotOnOrAfter validation failed.");
}
}
public static void SetRecipient(this Saml2SecurityToken token, Uri recipient) => token.SetRecipient(recipient, null as Saml2Id);
public static Saml2Id GetInResponseTo(this Saml2SecurityToken token)
{
var data = token.GetBearerSubjectConfirmationData();
return(data?.InResponseTo);
}
public static void SetNotOnOrAfter(this Saml2SecurityToken token) => token.SetNotOnOrAfter(token.ValidTo);
public static void SetNotBefore(this Saml2SecurityToken token) => token.SetNotBefore(token.ValidFrom);
public static void SetRecipient(this Saml2SecurityToken token, Uri recipient, string inResponseTo) => token.SetRecipient(recipient, inResponseTo != null ? new Saml2Id(inResponseTo) : null);
private static string CreateSamlResponseXml(Microsoft.IdentityModel.Tokens.Saml2.Saml2SecurityTokenHandler tokenHandler, Microsoft.IdentityModel.Tokens.Saml2.Saml2SecurityToken token)
{
var buffer = new StringBuilder();
using (var stringWriter = new StringWriter(buffer))
using (var xmlWriter = XmlWriter.Create(stringWriter, new XmlWriterSettings()))
{
xmlWriter.WriteStartElement("Response", "urn:oasis:names:tc:SAML:2.0:protocol");
xmlWriter.WriteAttributeString("IssueInstant", DateTime.UtcNow.ToString("s"));
xmlWriter.WriteAttributeString("ID", "_" + Guid.NewGuid());
xmlWriter.WriteAttributeString("Version", "2.0");
xmlWriter.WriteStartElement("Status");
xmlWriter.WriteStartElement("StatusCode");
xmlWriter.WriteAttributeString("Value", "urn:oasis:names:tc:SAML:2.0:status:Success");
xmlWriter.WriteEndElement();
xmlWriter.WriteEndElement();
tokenHandler.WriteToken(xmlWriter, token);
xmlWriter.WriteEndElement();
}
return(buffer.ToString());
}
