/// <summary>
/// Try and parse data into an Negotiate authentication token.
/// </summary>
/// <param name="data">The data to parse.</param>
/// <param name="token">The Negotiate authentication token.</param>
/// <param name="client">True if this is a token from a client.</param>
/// <param name="token_count">The token count number.</param>
/// <returns>True if parsed successfully.</returns>
internal static bool TryParse(byte[] data, int token_count, bool client, out NegotiateAuthenticationToken token)
{
token = null;
try
{
token = new NegotiateAuthenticationToken(data);
return(true);
}
catch (EndOfStreamException)
{
return(false);
}
}
/// <summary>
/// Try and parse data into an Negotiate authentication token.
/// </summary>
/// <param name="data">The data to parse.</param>
/// <param name="token">The Negotiate authentication token.</param>
/// <param name="client">True if this is a token from a client.</param>
/// <param name="token_count">The token count number.</param>
/// <returns>True if parsed successfully.</returns>
internal static bool TryParse(byte[] data, int token_count, bool client, out NegotiateAuthenticationToken token)
{
token = null;
try
{
byte[] token_data;
if (GSSAPIUtils.TryParse(data, out token_data, out string oid))
{
if (oid != OIDValues.SPNEGO)
{
return(false);
}
}
else
{
token_data = data;
}
DERValue[] values = DERParser.ParseData(token_data, 0);
if (values.Length != 1 || values[0].Type != DERTagType.ContextSpecific)
{
return(false);
}
if (values[0].CheckContext(0))
{
return(ParseInit(data, values[0].Children, token_count, client, out token));
}
else if (values[0].CheckContext(1))
{
return(ParseResp(data, values[0].Children, token_count, client, out token));
}
else
{
return(false);
}
}
catch (EndOfStreamException)
{
}
catch (InvalidDataException)
{
}
return(false);
}
/// <summary>
/// Try and parse data into an Negotiate authentication token.
/// </summary>
/// <param name="data">The data to parse.</param>
/// <param name="token">The Negotiate authentication token.</param>
/// <param name="client">True if this is a token from a client.</param>
/// <param name="token_count">The token count number.</param>
/// <returns>True if parsed successfully.</returns>
internal static bool TryParse(byte[] data, int token_count, bool client, out NegotiateAuthenticationToken token)
{
token = null;
try {
if (GSSAPIUtils.TryParse(data, out byte[] token_data, out string oid))
private static bool ParseResp(byte[] data, DERValue[] values, int token_count, bool client, out NegotiateAuthenticationToken token)
{
token = null;
if (!values.CheckValueSequence())
{
return(false);
}
string mech = null;
NegotiateAuthenticationState state = NegotiateAuthenticationState.Reject;
AuthenticationToken auth_token = null;
byte[] mic = null;
foreach (var next in values[0].Children)
{
if (next.Type != DERTagType.ContextSpecific)
{
return(false);
}
switch (next.Tag)
{
case 0:
state = (NegotiateAuthenticationState)next.ReadChildEnumerated();
break;
case 1:
mech = next.ReadChildObjID();
break;
case 2:
auth_token = ParseToken(next.ReadChildOctetString(), token_count, client);
break;
case 3:
mic = next.ReadChildOctetString();
break;
default:
return(false);
}
}
token = new NegotiateResponseAuthenticationToken(data, mech, state, auth_token, mic);
return(true);
}
private static bool ParseInit(byte[] data, DERValue[] values, int token_count, bool client, out NegotiateAuthenticationToken token)
{
token = null;
if (!values.CheckValueSequence())
{
return(false);
}
IEnumerable <string> mech_list = null;
NegotiateContextFlags flags = NegotiateContextFlags.None;
AuthenticationToken auth_token = null;
byte[] mic = null;
foreach (var next in values[0].Children)
{
if (next.Type != DERTagType.ContextSpecific)
{
return(false);
}
switch (next.Tag)
{
case 0:
mech_list = ParseMechList(next.Children);
break;
case 1:
flags = ConvertContextFlags(next.ReadChildBitString());
break;
case 2:
auth_token = ParseToken(next.ReadChildOctetString(), token_count, client);
break;
case 3:
// If NegTokenInit2 then just ignore neg hints.
if (next.HasChildren() && next.Children[0].CheckSequence())
{
break;
}
mic = next.ReadChildOctetString();
break;
case 4:
// Used if NegTokenInit2.
mic = next.ReadChildOctetString();
break;
default:
return(false);
}
}
token = new NegotiateInitAuthenticationToken(data, mech_list, flags, auth_token, mic);
return(true);
}
