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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.IdentityModel.Tokens
{
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.IdentityModel;
using System.IdentityModel.Selectors;
using System.Runtime.Serialization;
using System.Security;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Xml;
public class SamlSerializer
{
DictionaryManager dictionaryManager;
public SamlSerializer()
{
}
// Interface to plug in external Dictionaries. The external
// dictionary should already be populated with all strings
// required by this assembly.
public void PopulateDictionary(IXmlDictionary dictionary)
{
if (dictionary == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("dictionary");
this.dictionaryManager = new DictionaryManager(dictionary);
}
internal DictionaryManager DictionaryManager
{
get
{
if (this.dictionaryManager == null)
this.dictionaryManager = new DictionaryManager();
return this.dictionaryManager;
}
}
public virtual SamlSecurityToken ReadToken(XmlReader reader, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver)
{
if (reader == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader");
XmlDictionaryReader dictionaryReader = XmlDictionaryReader.CreateDictionaryReader(reader);
WrappedReader wrappedReader = new WrappedReader(dictionaryReader);
SamlAssertion assertion = LoadAssertion(wrappedReader, keyInfoSerializer, outOfBandTokenResolver);
if (assertion == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SAMLUnableToLoadAssertion)));
//if (assertion.Signature == null)
// throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenException(SR.GetString(SR.SamlTokenMissingSignature)));
return new SamlSecurityToken(assertion);
}
public virtual void WriteToken(SamlSecurityToken token, XmlWriter writer, SecurityTokenSerializer keyInfoSerializer)
{
if (token == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("token");
#pragma warning suppress 56506 // token.Assertion is never null.
token.Assertion.WriteTo(writer, this, keyInfoSerializer);
}
public virtual SamlAssertion LoadAssertion(XmlDictionaryReader reader, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver)
{
if (reader == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader");
SamlAssertion assertion = new SamlAssertion();
assertion.ReadXml(reader, this, keyInfoSerializer, outOfBandTokenResolver);
return assertion;
}
public virtual SamlCondition LoadCondition(XmlDictionaryReader reader, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver)
{
if (reader == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader");
if (reader.IsStartElement(DictionaryManager.SamlDictionary.AudienceRestrictionCondition, DictionaryManager.SamlDictionary.Namespace))
{
SamlAudienceRestrictionCondition audienceRestriction = new SamlAudienceRestrictionCondition();
audienceRestriction.ReadXml(reader, this, keyInfoSerializer, outOfBandTokenResolver);
return audienceRestriction;
}
else if (reader.IsStartElement(DictionaryManager.SamlDictionary.DoNotCacheCondition, DictionaryManager.SamlDictionary.Namespace))
{
SamlDoNotCacheCondition doNotCacheCondition = new SamlDoNotCacheCondition();
doNotCacheCondition.ReadXml(reader, this, keyInfoSerializer, outOfBandTokenResolver);
return doNotCacheCondition;
}
else
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.SAMLUnableToLoadUnknownElement, reader.LocalName)));
}
public virtual SamlConditions LoadConditions(XmlDictionaryReader reader, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver)
{
if (reader == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader");
SamlConditions conditions = new SamlConditions();
conditions.ReadXml(reader, this, keyInfoSerializer, outOfBandTokenResolver);
return conditions;
}
public virtual SamlAdvice LoadAdvice(XmlDictionaryReader reader, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver)
{
if (reader == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader");
SamlAdvice advice = new SamlAdvice();
advice.ReadXml(reader, this, keyInfoSerializer, outOfBandTokenResolver);
return advice;
}
public virtual SamlStatement LoadStatement(XmlDictionaryReader reader, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver)
{
if (reader == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("reader");
if (reader.IsStartElement(DictionaryManager.SamlDictionary.AuthenticationStatement, DictionaryManager.SamlDictionary.Namespace))
{
SamlAuthenticationStatement authStatement = new SamlAuthenticationStatement();
authStatement.ReadXml(reader, this, keyInfoSerializer, outOfBandTokenResolver);
return authStatement;
}
else if (reader.IsStartElement(DictionaryManager.SamlDictionary.AttributeStatement, DictionaryManager.SamlDictionary.Namespace))
{
SamlAttributeStatement attrStatement = new SamlAttributeStatement();
attrStatement.ReadXml(reader, this, keyInfoSerializer, outOfBandTokenResolver);
return attrStatement;
}
else if (reader.IsStartElement(DictionaryManager.SamlDictionary.AuthorizationDecisionStatement, DictionaryManager.SamlDictionary.Namespace))
{
SamlAuthorizationDecisionStatement authDecisionStatement = new SamlAuthorizationDecisionStatement();
authDecisionStatement.ReadXml(reader, this, keyInfoSerializer, outOfBandTokenResolver);
return authDecisionStatement;
}
else
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.SAMLUnableToLoadUnknownElement, reader.LocalName)));
}
public virtual SamlAttribute LoadAttribute(XmlDictionaryReader reader, SecurityTokenSerializer keyInfoSerializer, SecurityTokenResolver outOfBandTokenResolver)
{
// We will load all attributes as string values.
SamlAttribute attribute = new SamlAttribute();
attribute.ReadXml(reader, this, keyInfoSerializer, outOfBandTokenResolver);
return attribute;
}
// Helper metods to read and write SecurityKeyIdentifiers.
internal static SecurityKeyIdentifier ReadSecurityKeyIdentifier(XmlReader reader, SecurityTokenSerializer tokenSerializer)
{
if (tokenSerializer == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("tokenSerializer", SR.GetString(SR.SamlSerializerRequiresExternalSerializers));
if (tokenSerializer.CanReadKeyIdentifier(reader))
{
return tokenSerializer.ReadKeyIdentifier(reader);
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SamlSerializerUnableToReadSecurityKeyIdentifier)));
}
internal static void WriteSecurityKeyIdentifier(XmlWriter writer, SecurityKeyIdentifier ski, SecurityTokenSerializer tokenSerializer)
{
if (tokenSerializer == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("tokenSerializer", SR.GetString(SR.SamlSerializerRequiresExternalSerializers));
bool keyWritten = false;
if (tokenSerializer.CanWriteKeyIdentifier(ski))
{
tokenSerializer.WriteKeyIdentifier(writer, ski);
keyWritten = true;
}
if (!keyWritten)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SamlSerializerUnableToWriteSecurityKeyIdentifier, ski.ToString())));
}
internal static SecurityKey ResolveSecurityKey(SecurityKeyIdentifier ski, SecurityTokenResolver tokenResolver)
{
if (ski == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("ski");
if (tokenResolver != null)
{
for (int i = 0; i < ski.Count; ++i)
{
SecurityKey key = null;
if (tokenResolver.TryResolveSecurityKey(ski[i], out key))
return key;
}
}
if (ski.CanCreateKey)
return ski.CreateKey();
return null;
}
internal static SecurityToken ResolveSecurityToken(SecurityKeyIdentifier ski, SecurityTokenResolver tokenResolver)
{
SecurityToken token = null;
if (tokenResolver != null)
{
tokenResolver.TryResolveToken(ski, out token);
}
if (token == null)
{
// Check if this is a RSA key.
RsaKeyIdentifierClause rsaClause;
if (ski.TryFind<RsaKeyIdentifierClause>(out rsaClause))
token = new RsaSecurityToken(rsaClause.Rsa);
}
if (token == null)
{
// Check if this is a X509RawDataKeyIdentifier Clause.
X509RawDataKeyIdentifierClause rawDataKeyIdentifierClause;
if (ski.TryFind<X509RawDataKeyIdentifierClause>(out rawDataKeyIdentifierClause))
token = new X509SecurityToken(new X509Certificate2(rawDataKeyIdentifierClause.GetX509RawData()));
}
return token;
}
}
}
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