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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Ocsp;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Tls
{
public sealed class CertificateStatus
{
private readonly short m_statusType;
private readonly object m_response;
public CertificateStatus(short statusType, object response)
{
if (!IsCorrectType(statusType, response))
throw new ArgumentException("not an instance of the correct type", "response");
this.m_statusType = statusType;
this.m_response = response;
}
public short StatusType
{
get { return m_statusType; }
}
public object Response
{
get { return m_response; }
}
public OcspResponse OcspResponse
{
get
{
if (!IsCorrectType(CertificateStatusType.ocsp, m_response))
throw new InvalidOperationException("'response' is not an OCSPResponse");
return (OcspResponse)m_response;
}
}
/// <summary>an <see cref="IList"/> of (possibly null) <see cref="Asn1.Ocsp.OcspResponse"/>.</summary>
public IList OcspResponseList
{
get
{
if (!IsCorrectType(CertificateStatusType.ocsp_multi, m_response))
throw new InvalidOperationException("'response' is not an OCSPResponseList");
return (IList)m_response;
}
}
/// <summary>Encode this <see cref="CertificateStatus"/> to a <see cref="Stream"/>.</summary>
/// <param name="output">the <see cref="Stream"/> to encode to.</param>
/// <exception cref="IOException"/>
public void Encode(Stream output)
{
TlsUtilities.WriteUint8(m_statusType, output);
switch (m_statusType)
{
case CertificateStatusType.ocsp:
{
OcspResponse ocspResponse = (OcspResponse)m_response;
byte[] derEncoding = ocspResponse.GetEncoded(Asn1Encodable.Der);
TlsUtilities.WriteOpaque24(derEncoding, output);
break;
}
case CertificateStatusType.ocsp_multi:
{
IList ocspResponseList = (IList)m_response;
int count = ocspResponseList.Count;
IList derEncodings = Platform.CreateArrayList(count);
long totalLength = 0;
foreach (OcspResponse ocspResponse in ocspResponseList)
{
if (ocspResponse == null)
{
derEncodings.Add(TlsUtilities.EmptyBytes);
}
else
{
byte[] derEncoding = ocspResponse.GetEncoded(Asn1Encodable.Der);
derEncodings.Add(derEncoding);
totalLength += derEncoding.Length;
}
totalLength += 3;
}
TlsUtilities.CheckUint24(totalLength);
TlsUtilities.WriteUint24((int)totalLength, output);
foreach (byte[] derEncoding in derEncodings)
{
TlsUtilities.WriteOpaque24(derEncoding, output);
}
break;
}
default:
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
/// <summary>Parse a <see cref="CertificateStatus"/> from a <see cref="Stream"/>.</summary>
/// <param name="context">the <see cref="TlsContext"/> of the current connection.</param>
/// <param name="input">the <see cref="Stream"/> to parse from.</param>
/// <returns>a <see cref="CertificateStatus"/> object.</returns>
/// <exception cref="IOException"/>
public static CertificateStatus Parse(TlsContext context, Stream input)
{
SecurityParameters securityParameters = context.SecurityParameters;
Certificate peerCertificate = securityParameters.PeerCertificate;
if (null == peerCertificate || peerCertificate.IsEmpty
|| CertificateType.X509 != peerCertificate.CertificateType)
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
int certificateCount = peerCertificate.Length;
int statusRequestVersion = securityParameters.StatusRequestVersion;
short status_type = TlsUtilities.ReadUint8(input);
object response;
switch (status_type)
{
case CertificateStatusType.ocsp:
{
RequireStatusRequestVersion(1, statusRequestVersion);
byte[] derEncoding = TlsUtilities.ReadOpaque24(input, 1);
response = ParseOcspResponse(derEncoding);
break;
}
case CertificateStatusType.ocsp_multi:
{
RequireStatusRequestVersion(2, statusRequestVersion);
byte[] ocsp_response_list = TlsUtilities.ReadOpaque24(input, 1);
MemoryStream buf = new MemoryStream(ocsp_response_list, false);
IList ocspResponseList = Platform.CreateArrayList();
while (buf.Position < buf.Length)
{
if (ocspResponseList.Count >= certificateCount)
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
int length = TlsUtilities.ReadUint24(buf);
if (length < 1)
{
ocspResponseList.Add(null);
}
else
{
byte[] derEncoding = TlsUtilities.ReadFully(length, buf);
ocspResponseList.Add(ParseOcspResponse(derEncoding));
}
}
// Match IList capacity to actual size
response = Platform.CreateArrayList(ocspResponseList);
break;
}
default:
throw new TlsFatalAlert(AlertDescription.decode_error);
}
return new CertificateStatus(status_type, response);
}
private static bool IsCorrectType(short statusType, Object response)
{
switch (statusType)
{
case CertificateStatusType.ocsp:
return response is OcspResponse;
case CertificateStatusType.ocsp_multi:
return IsOcspResponseList(response);
default:
throw new ArgumentException("unsupported CertificateStatusType", "statusType");
}
}
private static bool IsOcspResponseList(object response)
{
if (!(response is IList))
return false;
IList v = (IList)response;
int count = v.Count;
if (count < 1)
return false;
foreach (object e in v)
{
if (null != e && !(e is OcspResponse))
return false;
}
return true;
}
/// <exception cref="IOException"/>
private static OcspResponse ParseOcspResponse(byte[] derEncoding)
{
Asn1Object asn1 = TlsUtilities.ReadAsn1Object(derEncoding);
OcspResponse ocspResponse = OcspResponse.GetInstance(asn1);
TlsUtilities.RequireDerEncoding(ocspResponse, derEncoding);
return ocspResponse;
}
/// <exception cref="IOException"/>
private static void RequireStatusRequestVersion(int minVersion, int statusRequestVersion)
{
if (statusRequestVersion < minVersion)
throw new TlsFatalAlert(AlertDescription.decode_error);
}
}
}
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