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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.IdentityModel.Diagnostics
{
using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Runtime.Diagnostics;
using System.Security.Cryptography;
using System.ServiceModel.Diagnostics;
using System.Xml;
class DigestTraceRecord : TraceRecord
{
MemoryStream _logStream;
HashAlgorithm _hash;
string _traceName;
const string Empty = "Empty";
const string CanonicalElementString = "CanonicalElementString";
const string CanonicalElementStringLength = "CanonicalElementStringLength";
const string CanonicalOctets = "CanonicalOctets";
const string CanonicalOctetsLength = "CanonicalOctetsLength";
const string CanonicalOctetsHash = "CanonicalOctetsHash";
const string CanonicalOctetsHashLength = "CanonicalOctetsHashLength";
const string Key = "Key";
const string Length = "Length";
const string FirstByte = "FirstByte";
const string LastByte = "LastByte";
internal DigestTraceRecord(string traceName, MemoryStream logStream, HashAlgorithm hash)
{
if (string.IsNullOrEmpty(traceName))
_traceName = Empty;
else
_traceName = traceName;
_logStream = logStream;
_hash = hash;
}
internal override string EventId
{
get
{
return TraceRecord.EventIdBase + _traceName + TraceRecord.NamespaceSuffix;
}
}
internal override void WriteTo(XmlWriter writer)
{
base.WriteTo(writer);
//
// canonical element string
//
byte[] contentBuffer = _logStream.GetBuffer();
string contentAsString = System.Text.Encoding.UTF8.GetString(contentBuffer, 0, (int)_logStream.Length);
writer.WriteElementString(CanonicalElementStringLength, contentAsString.Length.ToString(CultureInfo.InvariantCulture));
writer.WriteComment(CanonicalElementString + ":" + contentAsString);
//
// canonical element base64 format
//
writer.WriteElementString(CanonicalOctetsLength, contentBuffer.Length.ToString(CultureInfo.InvariantCulture));
writer.WriteElementString(CanonicalOctets, Convert.ToBase64String(contentBuffer));
//
// Hash
//
writer.WriteElementString(CanonicalOctetsHashLength, _hash.Hash.Length.ToString(CultureInfo.InvariantCulture));
writer.WriteElementString(CanonicalOctetsHash, Convert.ToBase64String(_hash.Hash));
//
// Key: this will only be printed out for the symmetric key case
//
if (_hash is KeyedHashAlgorithm)
{
KeyedHashAlgorithm keyedHash = _hash as KeyedHashAlgorithm;
byte[] key = keyedHash.Key;
writer.WriteStartElement(Key); // start the key element
writer.WriteElementString(Length, key.Length.ToString(CultureInfo.InvariantCulture)); // key length
writer.WriteElementString(FirstByte, key[0].ToString(CultureInfo.InvariantCulture)); // first byte of the key
writer.WriteElementString(LastByte, key[key.Length - 1].ToString(CultureInfo.InvariantCulture)); // last byte of the key
writer.WriteEndElement(); // close the key element
}
}
}
internal static class DigestTraceRecordHelper
{
const string DigestTrace = "DigestTrace";
static bool _shouldTraceDigest = false;
static bool _initialized = false;
internal static bool ShouldTraceDigest
{
get
{
if (!_initialized)
InitializeShouldTraceDigest();
return _shouldTraceDigest;
}
}
static void InitializeShouldTraceDigest()
{
//
// Log the digest only if
// 1.Users ask for verbose AND
// 2.Users are fine with logging Pii ( private identity information )
//
if (DiagnosticUtility.DiagnosticTrace != null &&
DiagnosticUtility.DiagnosticTrace.TraceSource != null &&
DiagnosticUtility.DiagnosticTrace.ShouldLogPii &&
DiagnosticUtility.ShouldTraceVerbose)
{
_shouldTraceDigest = true;
}
_initialized = true;
}
internal static void TraceDigest(MemoryStream logStream, HashAlgorithm hash)
{
if (DigestTraceRecordHelper.ShouldTraceDigest)
{
TraceUtility.TraceEvent(TraceEventType.Verbose, TraceCode.IdentityModel, SR.GetString(SR.TraceCodeIdentityModel), new DigestTraceRecord(DigestTrace, logStream, hash), null, null);
}
}
}
}
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