private static byte[]? GetNegotiatedApplicationProtocol(SafeDeleteContext context)
{
Interop.SecPkgContext_ApplicationProtocol alpnContext = default;
bool success = SSPIWrapper.QueryBlittableContextAttributes(GlobalSSPI.SSPISecureChannel, context, Interop.SspiCli.ContextAttribute.SECPKG_ATTR_APPLICATION_PROTOCOL, ref alpnContext);
// Check if the context returned is alpn data, with successful negotiation.
if (success &&
alpnContext.ProtoNegoExt == Interop.ApplicationProtocolNegotiationExt.ALPN &&
alpnContext.ProtoNegoStatus == Interop.ApplicationProtocolNegotiationStatus.Success)
{
if (alpnContext.Protocol.SequenceEqual(s_http1))
{
return(s_http1);
}
else if (alpnContext.Protocol.SequenceEqual(s_http2))
{
return(s_http2);
}
else if (alpnContext.Protocol.SequenceEqual(s_http3))
{
return(s_http3);
}
return(alpnContext.Protocol.ToArray());
}
return(null);
}
internal static byte[] GetNegotiatedApplicationProtocol(SafeDeleteContext context)
{
Interop.SecPkgContext_ApplicationProtocol alpnContext = SSPIWrapper.QueryContextAttributes(
GlobalSSPI.SSPISecureChannel,
context,
Interop.SspiCli.ContextAttribute.SECPKG_ATTR_APPLICATION_PROTOCOL) as Interop.SecPkgContext_ApplicationProtocol;
// Check if the context returned is alpn data, with successful negotiation.
if (alpnContext == null ||
alpnContext.ProtoNegoExt != Interop.ApplicationProtocolNegotiationExt.ALPN ||
alpnContext.ProtoNegoStatus != Interop.ApplicationProtocolNegotiationStatus.Success)
{
return(null);
}
return(alpnContext.Protocol);
}
