/// <summary>
/// Creates a new <see cref="KeyInfo"/> object.
/// </summary>
/// <param name="reader">The current <see cref="XmlReader"/>.</param>
protected virtual KeyInfo CreateKeyInfo(XmlReader reader)
{
XmlUtil.CheckReaderOnEntry(reader, XmlSignatureConstants.Elements.KeyInfo, XmlSignatureConstants.Namespace);
return(new KeyInfo
{
Prefix = reader.Prefix
});
}
/// <summary>
/// Reads XML conforming to https://www.w3.org/TR/2001/PR-xmldsig-core-20010820/#sec-KeyInfo
/// </summary>
/// <param name="reader"><see cref="XmlReader"/> pointing positioned on a <KeyInfo> element.</param>
/// <exception cref="ArgumentNullException">if <paramref name="reader"/> is null.</exception>
/// <exception cref="XmlReadException">if there is a problem reading the XML.</exception>
/// <remarks>Only handles IssuerSerial, Ski, SubjectName, Certificate. Unsupported types are skipped. Only a X509 data element is supported.</remarks>
public override KeyInfo ReadKeyInfo(XmlReader reader)
{
XmlUtil.CheckReaderOnEntry(reader, XmlSignatureConstants.Elements.KeyInfo, XmlSignatureConstants.Namespace);
var keyInfo = CreateKeyInfo(reader);
try
{
bool isEmptyElement = reader.IsEmptyElement;
// <KeyInfo>
reader.ReadStartElement();
while (reader.IsStartElement())
{
if (!TryReadKeyInfoType(reader, ref keyInfo))
{
// Skip the element since it is not one of elements handled by TryReadKeyInfoType
LogHelper.LogWarning(GetLogMessage("IDX30300"), reader.ReadOuterXml());
}
}
// </KeyInfo>
if (!isEmptyElement)
{
reader.ReadEndElement();
}
}
catch (Exception ex)
{
if (ex is XmlReadException)
{
throw;
}
throw XmlUtil.LogReadException(GetLogMessage("IDX30017"), ex, XmlSignatureConstants.Elements.KeyInfo, ex);
}
return(keyInfo);
}
protected override Saml2SubjectConfirmationData ReadSubjectConfirmationData(XmlDictionaryReader reader)
{
XmlUtil.CheckReaderOnEntry(reader, Saml2Constants.Elements.SubjectConfirmationData, Saml2Constants.Namespace);
try
{
var confirmationData = new Saml2SubjectConfirmationData();
bool isEmpty = reader.IsEmptyElement;
// @xsi:type
bool requireKeyInfo = false;
var type = XmlUtil.GetXsiTypeAsQualifiedName(reader);
if (null != type)
{
if (XmlUtil.EqualsQName(type, Saml2Constants.Types.KeyInfoConfirmationDataType, Saml2Constants.Namespace) ||
type.Name == Saml2Constants.Types.KeyInfoConfirmationDataType)
{
requireKeyInfo = true;
}
else if (!XmlUtil.EqualsQName(type, Saml2Constants.Types.SubjectConfirmationDataType, Saml2Constants.Namespace) &&
type.Name != Saml2Constants.Types.SubjectConfirmationDataType)
{
throw XmlUtil.LogReadException(GetLogMessage("IDX13126"), type.Name, type.Namespace);
}
}
// KeyInfoConfirmationData cannot be empty
if (requireKeyInfo && isEmpty)
{
throw XmlUtil.LogReadException(GetLogMessage("IDX13127"));
}
// @Address - optional
string value = reader.GetAttribute(Saml2Constants.Attributes.Address);
if (!string.IsNullOrEmpty(value))
{
confirmationData.Address = value;
}
// @InResponseTo - optional
value = reader.GetAttribute(Saml2Constants.Attributes.InResponseTo);
if (!string.IsNullOrEmpty(value))
{
confirmationData.InResponseTo = new Saml2Id(value);
}
// @NotBefore - optional
value = reader.GetAttribute(Saml2Constants.Attributes.NotBefore);
if (!string.IsNullOrEmpty(value))
{
confirmationData.NotBefore = XmlConvert.ToDateTime(value, XmlDateTimeSerializationMode.Utc);
}
// @NotOnOrAfter - optional
value = reader.GetAttribute(Saml2Constants.Attributes.NotOnOrAfter);
if (!string.IsNullOrEmpty(value))
{
confirmationData.NotOnOrAfter = XmlConvert.ToDateTime(value, XmlDateTimeSerializationMode.Utc);
}
// @Recipient - optional
value = reader.GetAttribute(Saml2Constants.Attributes.Recipient);
if (!string.IsNullOrEmpty(value))
{
if (!Uri.TryCreate(value, UriKind.Absolute, out _))
{
throw XmlUtil.LogReadException(GetLogMessage("IDX13107"), Saml2Constants.Elements.SubjectConfirmationData, Saml2Constants.Attributes.Recipient, reader.LocalName);
}
confirmationData.Recipient = new Uri(value);
}
// Contents
reader.Read();
if (!isEmpty)
{
while (reader.IsStartElement(XmlSignatureConstants.Elements.KeyInfo, XmlSignatureConstants.Namespace))
{
confirmationData.KeyInfos.Add(DSigSerializer.ReadKeyInfo(reader));
}
// If this isn't KeyInfo restricted, there might be open content here ...
if (!requireKeyInfo && XmlNodeType.EndElement != reader.NodeType)
{
// So throw and tell the user how to handle the open content
throw XmlUtil.LogReadException(GetLogMessage("IDX13128"), Saml2Constants.Elements.SubjectConfirmationData);
}
reader.ReadEndElement();
}
return(confirmationData);
}
catch (Exception ex)
{
if (ex is Saml2SecurityTokenReadException)
{
throw;
}
throw XmlUtil.LogReadException(GetLogMessage("IDX13102"), ex, Saml2Constants.Elements.SubjectConfirmationData, ex);
}
}
/// <summary>
/// Reads a <saml:Assertion> element.
/// </summary>
/// <param name="reader">A <see cref="XmlReader"/> positioned at a <see cref="Saml2Assertion"/> element.</param>
/// <exception cref="ArgumentNullException">if <paramref name="reader"/> is null.</exception>
/// <exception cref="NotSupportedException">if assertion is encrypted.</exception>
/// <exception cref="Saml2SecurityTokenReadException">If <paramref name="reader"/> is not positioned at a Saml2Assertion.</exception>
/// <exception cref="Saml2SecurityTokenReadException">If Version is not '2.0'.</exception>
/// <exception cref="Saml2SecurityTokenReadException">If 'Id' is missing.</exception>>
/// <exception cref="Saml2SecurityTokenReadException">If 'IssueInstant' is missing.</exception>>
/// <exception cref="Saml2SecurityTokenReadException">If no statements are found.</exception>>
/// <returns>A <see cref="Saml2Assertion"/> instance.</returns>
public override Saml2Assertion ReadAssertion(XmlReader reader)
{
XmlUtil.CheckReaderOnEntry(reader, Saml2Constants.Elements.Assertion, Saml2Constants.Namespace);
if (reader.IsStartElement(Saml2Constants.Elements.EncryptedAssertion, Saml2Constants.Namespace))
{
var encrypted = new XmlDocument();
encrypted.PreserveWhitespace = true;
encrypted.Load(reader);
XmlElement decrypted = null;
foreach (var cert in DecryptionCertificates)
{
try
{
decrypted = encrypted.DocumentElement.Decrypt(cert.PrivateKey);
break;
}
catch (CryptographicException)
{
}
}
if (decrypted == null)
{
throw new InvalidOperationException(
"Encrypted assertion could not be decrypted using any available decryption certificate");
}
reader = new XmlNodeReader(decrypted);
}
var envelopeReader = new EnvelopedSignatureReader(reader);
var assertion = new Saml2Assertion(new Saml2NameIdentifier("__TemporaryIssuer__"));
try
{
// @xsi:type
XmlUtil.ValidateXsiType(envelopeReader, Saml2Constants.Types.AssertionType, Saml2Constants.Namespace);
// @Version - required - must be "2.0"
string version = envelopeReader.GetAttribute(Saml2Constants.Attributes.Version);
if (string.IsNullOrEmpty(version))
{
throw LogReadException(LogMessages.IDX13106, Saml2Constants.Elements.Assertion, Saml2Constants.Attributes.Version);
}
if (!StringComparer.Ordinal.Equals(Saml2Constants.Version, version))
{
throw LogReadException(LogMessages.IDX13137, version);
}
// @ID - required
string value = envelopeReader.GetAttribute(Saml2Constants.Attributes.ID);
if (string.IsNullOrEmpty(value))
{
throw LogReadException(LogMessages.IDX13106, Saml2Constants.Elements.Assertion, Saml2Constants.Attributes.ID);
}
assertion.Id = new Saml2Id(value);
// @IssueInstant - required
value = envelopeReader.GetAttribute(Saml2Constants.Attributes.IssueInstant);
if (string.IsNullOrEmpty(value))
{
throw LogReadException(LogMessages.IDX13106, Saml2Constants.Elements.Assertion, Saml2Constants.Attributes.IssueInstant);
}
assertion.IssueInstant = DateTime.ParseExact(value, Saml2Constants.AcceptedDateTimeFormats, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None).ToUniversalTime();
// will move to next element
// <ds:Signature> 0-1 read by EnvelopedSignatureReader
envelopeReader.Read();
// <Issuer> 1
assertion.Issuer = ReadIssuer(envelopeReader);
// <Subject> 0-1
if (envelopeReader.IsStartElement(Saml2Constants.Elements.Subject, Saml2Constants.Namespace))
{
assertion.Subject = ReadSubject(envelopeReader);
}
// <Conditions> 0-1
if (envelopeReader.IsStartElement(Saml2Constants.Elements.Conditions, Saml2Constants.Namespace))
{
assertion.Conditions = ReadConditions(envelopeReader);
}
// <Advice> 0-1
if (envelopeReader.IsStartElement(Saml2Constants.Elements.Advice, Saml2Constants.Namespace))
{
assertion.Advice = ReadAdvice(envelopeReader);
}
// <Statement|AuthnStatement|AuthzDecisionStatement|AttributeStatement>, 0-OO
while (envelopeReader.IsStartElement())
{
Saml2Statement statement;
if (envelopeReader.IsStartElement(Saml2Constants.Elements.Statement, Saml2Constants.Namespace))
{
statement = ReadStatement(envelopeReader);
}
else if (envelopeReader.IsStartElement(Saml2Constants.Elements.AttributeStatement, Saml2Constants.Namespace))
{
statement = ReadAttributeStatement(envelopeReader);
}
else if (envelopeReader.IsStartElement(Saml2Constants.Elements.AuthnStatement, Saml2Constants.Namespace))
{
if (IgnoreAuthenticationContext)
{
envelopeReader.Skip();
continue;
}
statement = ReadAuthenticationStatement(envelopeReader);
}
else if (envelopeReader.IsStartElement(Saml2Constants.Elements.AuthzDecisionStatement, Saml2Constants.Namespace))
{
statement = ReadAuthorizationDecisionStatement(envelopeReader);
}
else
{
break;
}
assertion.Statements.Add(statement);
}
envelopeReader.ReadEndElement();
if (assertion.Subject == null)
{
// An assertion with no statements MUST contain a <Subject> element. [Saml2Core, line 585]
if (0 == assertion.Statements.Count)
{
throw LogReadException(LogMessages.IDX13108, Saml2Constants.Elements.Assertion);
}
// Furthermore, the built-in statement types all require the presence of a subject.
// [Saml2Core, lines 1050, 1168, 1280]
foreach (Saml2Statement statement in assertion.Statements)
{
if (statement is Saml2AuthenticationStatement ||
statement is Saml2AttributeStatement ||
statement is Saml2AuthorizationDecisionStatement)
{
throw LogReadException(LogMessages.IDX13109, Saml2Constants.Elements.Assertion);
}
}
}
// attach signedXml for validation of signature
assertion.Signature = envelopeReader.Signature;
return(assertion);
}
catch (Exception ex)
{
if (ex is Saml2SecurityTokenReadException)
{
throw;
}
throw LogReadException(LogMessages.IDX13102, ex, Saml2Constants.Elements.Assertion, ex);
}
}
public override KeyInfo ReadKeyInfo(XmlReader reader)
{
XmlUtil.CheckReaderOnEntry(reader, XmlSignatureConstants.Elements.KeyInfo, XmlSignatureConstants.Namespace);
var keyInfo = new WsSecurityKeyInfo
{
Prefix = reader.Prefix
};
try
{
bool isEmptyElement = reader.IsEmptyElement;
// <KeyInfo>
reader.ReadStartElement();
while (reader.IsStartElement())
{
// <SecurityTokenReference>
if (reader.IsStartElement("SecurityTokenReference", WsSecurityConstants.WsSecurity10.Namespace))
{
//<o:SecurityTokenReference>
// <o:Reference ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" URI="#uuid-2a7d35cf-97d9-4177-8b84-8a74f5dcd8a2-29"></o:Reference>
//</o:SecurityTokenReference>
reader.ReadStartElement();
if (reader.IsStartElement("Reference", WsSecurityConstants.WsSecurity10.Namespace))
{
var uri = reader.GetAttribute(XmlSignatureConstants.Attributes.URI);
keyInfo.SecurityTokenReference = new WsSecurityTokenReference(new KeyIdentifier(uri))
{
Reference = new WsSecurityReference
{
ValueType = reader.GetAttribute("ValueType"),
Uri = uri
}
//Reference = new WsSecurityReference()
//{
// ValueType = reader.GetAttribute("ValueType"),
// Uri = uri
//}
};
_ = reader.ReadOuterXml();
}
reader.ReadEndElement();
}
else
{
//LogHelper.LogWarning(LogMessages.IDX30300, reader.ReadOuterXml());
_ = reader.ReadOuterXml(); // TODO: log this somehow
}
}
// </KeyInfo>
if (!isEmptyElement)
{
reader.ReadEndElement();
}
}
catch (Exception ex)
{
if (ex is XmlReadException)
{
throw;
}
throw new XmlReadException($"{ "IDX30017" }: Could not read {XmlSignatureConstants.Elements.KeyInfo} element.", ex);// XmlUtil.LogReadException(LogMessages.IDX30017, ex, XmlSignatureConstants.Elements.KeyInfo, ex);
}
return(keyInfo);
}