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NTLMv2ClientChallenge: Renamed variables, exposed reserved fields

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This commit is contained in:
Tal Aloni 2017-01-19 22:00:17 +02:00
parent efc8c683ea
commit f6feaced77
1 changed files with 25 additions and 19 deletions
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42
SMBLibrary/Authentication/AuthenticateMessage/NTLMv2ClientChallenge.cs
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@ -16,25 +16,27 @@ namespace SMBLibrary.Authentication
/// </summary> /// </summary>
public class NTLMv2ClientChallenge public class NTLMv2ClientChallenge
{ {
public const byte StructureVersion = 0x01;
public static readonly DateTime EpochTime = DateTime.FromFileTimeUtc(0); public static readonly DateTime EpochTime = DateTime.FromFileTimeUtc(0);
public byte ResponseVersion; public byte CurrentVersion;
public byte ResponseVersionHigh; public byte MaximumSupportedVersion;
// 6 zero bytes public ushort Reserved1;
public DateTime Time; public uint Reserved2;
// 4 zero bytes public DateTime TimeStamp;
public byte[] ClientChallenge; // 8-byte challenge message generated by the client public uint Reserved3;
public byte[] ClientChallenge; // 8-byte challenge generated by the client
public KeyValuePairList<AVPairKey, byte[]> AVPairs; public KeyValuePairList<AVPairKey, byte[]> AVPairs;
public NTLMv2ClientChallenge() public NTLMv2ClientChallenge()
{ {
} }
public NTLMv2ClientChallenge(DateTime time, byte[] clientChallenge, string domainName, string computerName) public NTLMv2ClientChallenge(DateTime timeStamp, byte[] clientChallenge, string domainName, string computerName)
{ {
ResponseVersion = 1; CurrentVersion = StructureVersion;
ResponseVersionHigh = 1; MaximumSupportedVersion = StructureVersion;
Time = time; TimeStamp = timeStamp;
ClientChallenge = clientChallenge; ClientChallenge = clientChallenge;
AVPairs = new KeyValuePairList<AVPairKey, byte[]>(); AVPairs = new KeyValuePairList<AVPairKey, byte[]>();
AVPairs.Add(AVPairKey.NbDomainName, UnicodeEncoding.Unicode.GetBytes(domainName)); AVPairs.Add(AVPairKey.NbDomainName, UnicodeEncoding.Unicode.GetBytes(domainName));
@ -47,24 +49,28 @@ namespace SMBLibrary.Authentication
public NTLMv2ClientChallenge(byte[] buffer, int offset) public NTLMv2ClientChallenge(byte[] buffer, int offset)
{ {
ResponseVersion = ByteReader.ReadByte(buffer, offset + 0); CurrentVersion = ByteReader.ReadByte(buffer, offset + 0);
ResponseVersionHigh = ByteReader.ReadByte(buffer, offset + 1); MaximumSupportedVersion = ByteReader.ReadByte(buffer, offset + 1);
long temp = LittleEndianConverter.ToInt64(buffer, offset + 8); Reserved1 = LittleEndianConverter.ToUInt16(buffer, offset + 2);
Time = DateTime.FromFileTimeUtc(temp); Reserved2 = LittleEndianConverter.ToUInt32(buffer, offset + 4);
TimeStamp = FileTimeHelper.ReadFileTime(buffer, offset + 8);
ClientChallenge = ByteReader.ReadBytes(buffer, offset + 16, 8); ClientChallenge = ByteReader.ReadBytes(buffer, offset + 16, 8);
Reserved3 = LittleEndianConverter.ToUInt32(buffer, offset + 24);
AVPairs = AVPairUtils.ReadAVPairSequence(buffer, offset + 28); AVPairs = AVPairUtils.ReadAVPairSequence(buffer, offset + 28);
} }
public byte[] GetBytes() public byte[] GetBytes()
{ {
byte[] sequenceBytes = AVPairUtils.GetAVPairSequenceBytes(AVPairs); byte[] sequenceBytes = AVPairUtils.GetAVPairSequenceBytes(AVPairs);
byte[] timeBytes = LittleEndianConverter.GetBytes((ulong)Time.ToFileTimeUtc());
byte[] buffer = new byte[28 + sequenceBytes.Length]; byte[] buffer = new byte[28 + sequenceBytes.Length];
ByteWriter.WriteByte(buffer, 0, ResponseVersion); ByteWriter.WriteByte(buffer, 0, CurrentVersion);
ByteWriter.WriteByte(buffer, 1, ResponseVersionHigh); ByteWriter.WriteByte(buffer, 1, MaximumSupportedVersion);
ByteWriter.WriteBytes(buffer, 8, timeBytes); LittleEndianWriter.WriteUInt16(buffer, 2, Reserved1);
LittleEndianWriter.WriteUInt32(buffer, 4, Reserved2);
FileTimeHelper.WriteFileTime(buffer, 8, TimeStamp);
ByteWriter.WriteBytes(buffer, 16, ClientChallenge, 8); ByteWriter.WriteBytes(buffer, 16, ClientChallenge, 8);
LittleEndianWriter.WriteUInt32(buffer, 24, Reserved3);
ByteWriter.WriteBytes(buffer, 28, sequenceBytes); ByteWriter.WriteBytes(buffer, 28, sequenceBytes);
return buffer; return buffer;
} }