private NetworkLayerObject GetKerberosTicketsHash(string source, string destination, byte[] data)
{
var kerberosPacket = KerberosPacketParser.GetKerberosPacket(data);
if (kerberosPacket is null)
{
return(null);
}
if (kerberosPacket is KerberosTgsRepPacket)
{
var kerberosTgsRepPacket = kerberosPacket as KerberosTgsRepPacket;
if (kerberosTgsRepPacket.Ticket.EncrytedPart.Etype == 23)
{
return(new KerberosTgsRepHash()
{
Source = source,
Destination = destination,
Realm = kerberosTgsRepPacket.Ticket.Realm,
Etype = 23,
Username = kerberosTgsRepPacket.Cname.Name,
ServiceName = kerberosTgsRepPacket.Ticket.Sname.Name,
Hash = NtlmsspHashParser.ByteArrayToHexString(kerberosTgsRepPacket.Ticket.EncrytedPart.Cipher),
Protocol = "UDP",
HashType = "Kerberos TGS Rep Etype 23"
});
}
}
return(null);
}
private NetworkLayerObject GetKerberosTicketsHash(string source, string destination, string protocol, byte[] data)
{
var kerberosPacket = KerberosPacketParser.GetKerberosPacket(data);
if (kerberosPacket is null)
{
return(null);
}
// TODO: refactor this boilerplate code
if (kerberosPacket is KerberosTgsRepPacket)
{
var kerberosTgsRepPacket = kerberosPacket as KerberosTgsRepPacket;
if (kerberosTgsRepPacket.Ticket.EncrytedPart.Etype == 23)
{
return(new KerberosTgsRepHash()
{
Source = source,
Destination = destination,
Realm = kerberosTgsRepPacket.Ticket.Realm,
Etype = 23,
Username = kerberosTgsRepPacket.Cname.Name,
ServiceName = kerberosTgsRepPacket.Ticket.Sname.Name,
Hash = NtlmsspHashParser.ByteArrayToHexString(kerberosTgsRepPacket.Ticket.EncrytedPart.Cipher),
Protocol = protocol,
HashType = "Kerberos V5 TGS-REP etype 23"
});
}
}
else if (kerberosPacket is KerberosAsRepPacket)
{
var kerberosAsRepPacket = kerberosPacket as KerberosAsRepPacket;
if (kerberosAsRepPacket.Ticket.EncrytedPart.Etype == 23)
{
return(new KerberosAsRepHash()
{
Source = source,
Destination = destination,
Realm = kerberosAsRepPacket.Ticket.Realm,
Etype = 23,
Username = kerberosAsRepPacket.Cname.Name,
ServiceName = kerberosAsRepPacket.Ticket.Sname.Name,
Hash = NtlmsspHashParser.ByteArrayToHexString(kerberosAsRepPacket.Ticket.EncrytedPart.Cipher),
Protocol = protocol,
HashType = "Kerberos V5 AS-REP etype 23"
});
}
}
return(null);
}
private NetworkLayerObject GetKerberosTicketsHash(string source, string destination, string protocol, byte[] data)
{
var kerberosPacket = KerberosPacketParser.GetKerberosPacket(data, protocol);
if (kerberosPacket is null)
{
return(null);
}
// TODO: use enum for hashes types
if (kerberosPacket is KerberosTgsRepPacket)
{
var kerberosTgsRepPacket = kerberosPacket as KerberosTgsRepPacket;
if (kerberosTgsRepPacket.Ticket.EncrytedPart.Etype == 23 || kerberosTgsRepPacket.Ticket.EncrytedPart.Etype == 18 || kerberosTgsRepPacket.Ticket.EncrytedPart.Etype == 17)
{
return(new KerberosTgsRepHash()
{
Source = source,
Destination = destination,
Realm = kerberosTgsRepPacket.Ticket.Realm,
Etype = kerberosTgsRepPacket.Ticket.EncrytedPart.Etype,
Username = kerberosTgsRepPacket.Cname.Name,
ServiceName = kerberosTgsRepPacket.Ticket.Sname.Name,
Hash = NtlmsspHashParser.ByteArrayToHexString(kerberosTgsRepPacket.Ticket.EncrytedPart.Cipher),
Protocol = protocol,
HashType = $"Kerberos V5 TGS-REP etype {kerberosTgsRepPacket.Ticket.EncrytedPart.Etype}"
});
}
}
else if (kerberosPacket is KerberosAsRepPacket)
{
var kerberosAsRepPacket = kerberosPacket as KerberosAsRepPacket;
if (kerberosAsRepPacket.Ticket.EncrytedPart.Etype == 23 || kerberosAsRepPacket.Ticket.EncrytedPart.Etype == 18)
{
return(new KerberosAsRepHash()
{
Source = source,
Destination = destination,
Realm = kerberosAsRepPacket.Ticket.Realm,
Etype = kerberosAsRepPacket.Ticket.EncrytedPart.Etype,
Username = kerberosAsRepPacket.Cname.Name,
ServiceName = kerberosAsRepPacket.Ticket.Sname.Name,
Hash = NtlmsspHashParser.ByteArrayToHexString(kerberosAsRepPacket.Ticket.EncrytedPart.Cipher),
Protocol = protocol,
HashType = $"Kerberos V5 AS-REP etype {kerberosAsRepPacket.Ticket.EncrytedPart.Etype}"
});
}
}
return(null);
}
private readonly byte[] pa_data_signiture2 = new byte[] { 0xa2, 0x35, 0x04, 0x33 }; // Hash length = 0x35 = 53
public NetworkLayerObject Parse(UdpPacket udpPacket)
{
if (!isKerberos(udpPacket))
{
return(null);
}
byte[] sig_part = udpPacket.Data.SubArray(40, 4);
if (Utilities.SearchForSubarray(sig_part, this.pa_data_signiture) == 0 ||
Utilities.SearchForSubarray(sig_part, this.pa_data_signiture2) == 0)
{
var paddingLen = 0;
var hashOffset = 44;
var userNameOffset = 144;
var hashItemLen = (int)udpPacket.Data[41];
if (hashItemLen == 53)
{
paddingLen = 1;
}
if (hashItemLen != 54 && hashItemLen != 53)
{
hashItemLen = (int)udpPacket.Data[48];
hashOffset = 49;
userNameOffset = hashItemLen + 97;
}
var hashLen = 52 - paddingLen;
byte[] hash = udpPacket.Data.SubArray(hashOffset, hashLen);
byte[] switchedHash = new byte[hashLen];
hash.SubArray(16, 36).CopyTo(switchedHash, 0);
hash.SubArray(0, 16).CopyTo(switchedHash, 36);
string hashString = NtlmsspHashParser.ByteArrayToHexString(switchedHash);
var userName = ExtractKerberosMessageItem(udpPacket.Data, userNameOffset - paddingLen, out int userNameLength);
string domain = ExtractKerberosMessageItem(udpPacket.Data, userNameOffset + userNameLength - paddingLen + 4, out int domainLength);
return(new KerberosHash()
{
HashType = "Kerberos V5 AS-REQ Pre-Auth etype 23",
Protocol = "UDP",
Source = udpPacket.DestinationIp,
Destination = udpPacket.SourceIp,
User = userName,
Domain = domain,
Hash = hashString
});
}
return(null);
}
