private string GetKrbErrorSalt(KerberosPacket kerberosPacket)
{
if (kerberosPacket.MsgType == KerberosPacket.MessageType.krb_error) //30
{
foreach (var item in kerberosPacket.AsnData.Where(item => item.Item2 == Utils.ByteConverter.Asn1TypeTag.OctetString))
{
foreach (var errorItem in Utils.ByteConverter.GetAsn1Data(item.Item3).Where(ei => ei.Item2 == Utils.ByteConverter.Asn1TypeTag.OctetString && ei.Item1 == "30.30.a2"))
{
foreach (var entry in Utils.ByteConverter.GetAsn1Data(errorItem.Item3).Where(ei => ei.Item2 == Utils.ByteConverter.Asn1TypeTag.OctetString && ei.Item1 == "30.30.a1"))
{
string salt;
try {
salt = Utils.ByteConverter.ReadString(entry.Item3);
if (salt.Length == entry.Item3.Length)
{
return(salt);
}
}
catch (Exception e) {
SharedUtils.Logger.Log("Error extracting kerberos salt from OctetString (30.30.a1): " + e.Message, SharedUtils.Logger.EventLogEntryType.Error);
}
//backup is to save salt as hex
return(Utils.ByteConverter.ReadHexString(entry.Item3, entry.Item3.Length, true));
}
}
}
}
else if (kerberosPacket.MsgType == KerberosPacket.MessageType.krb_as_rep)
{
//Extract salt from packets matching "kerberos.padata_type == 3"
foreach (var item in kerberosPacket.AsnData.Where(item => item.Item2 == Utils.ByteConverter.Asn1TypeTag.OctetString && item.Item1 == "6b.30.a2.30.30.a2"))
{
string salt;
foreach (var saltItem in Utils.ByteConverter.GetAsn1Data(item.Item3).Where(si => si.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && si.Item1 == "30.30.a1"))
{
try {
salt = Utils.ByteConverter.ReadString(saltItem.Item3);
if (salt.Length == saltItem.Item3.Length)
{
return(salt);//only return the first matching element
}
}
catch (Exception e) {
SharedUtils.Logger.Log("Error extracting kerberos salt from GeneralString: " + e.Message, SharedUtils.Logger.EventLogEntryType.Error);
}
}
//If no GeneralString is found, try to extract salt from the OctetString data
try {
salt = Utils.ByteConverter.ReadString(item.Item3);
if (salt.Length == item.Item3.Length)
{
return(salt);
}
}
catch (Exception e) {
SharedUtils.Logger.Log("Error extracting kerberos salt from OctetString: " + e.Message, SharedUtils.Logger.EventLogEntryType.Error);
}
//backup is to save salt as hex
return(Utils.ByteConverter.ReadHexString(item.Item3, item.Item3.Length, true));
}
}
return(null);
}
private (string username, string realm) GetUserAndRealm(KerberosPacket kerberosPacket, NetworkHost sourceHost, NetworkHost destinationHost)
{
string username = "";
string realm = "";
List <string> spnParts = new List <string>();
foreach (var item in kerberosPacket.AsnData.Where(item => stringTypes.Contains(item.Item2)))
{
string itemString = Utils.ByteConverter.ReadString(item.Item3);
if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && hostnameRequestPaths.Contains(item.Item1) && itemString.EndsWith("$"))
{
string hostname = itemString.TrimEnd(new[] { '$' });
sourceHost.AddHostName(hostname);
//parameters.Add("Hostname (" + item.Item1 + ")", hostname);
realm = hostname;
}
else if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && hostnameResponsePaths.Contains(item.Item1) && itemString.EndsWith("$"))
{
string hostname = itemString.TrimEnd(new[] { '$' });
destinationHost.AddHostName(hostname);
//parameters.Add("Hostname (" + item.Item1 + ")", hostname);
realm = hostname;
}
else if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && (usernameRequestPaths.Contains(item.Item1) || usernameResponsePaths.Contains(item.Item1)) && !itemString.EndsWith("$"))
{
if (usernameRequestPaths.Contains(item.Item1))
{
base.MainPacketHandler.AddCredential(new NetworkCredential(sourceHost, destinationHost, "Kerberos", itemString, kerberosPacket.ParentFrame.Timestamp));
sourceHost.AddNumberedExtraDetail("Kerberos Username", itemString);
username = itemString;
}
else if (usernameResponsePaths.Contains(item.Item1))
{
base.MainPacketHandler.AddCredential(new NetworkCredential(destinationHost, sourceHost, "Kerberos", itemString, kerberosPacket.ParentFrame.Timestamp));
destinationHost.AddNumberedExtraDetail("Kerberos Username", itemString);
username = itemString;
}
#if DEBUG
else
{
System.Diagnostics.Debugger.Break();
}
#endif
//parameters.Add("Username (" + item.Item1 + ")", username);
}
else if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && domainPaths.Contains(item.Item1))
{
sourceHost.AddDomainName(itemString);
destinationHost.AddDomainName(itemString);
//parameters.Add("Realm (" + item.Item1 + ")", itemString);
realm = itemString;
}
else if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && kerberosPacket.MsgType == KerberosPacket.MessageType.krb_tgs_rep && hostnameResponsePaths.Contains(item.Item1))
{
spnParts.Add(itemString);
}
else
{
//parameters.Add(item.Item1 + " " + Enum.GetName(typeof(Utils.ByteConverter.Asn1TypeTag), item.Item2), itemString);
}
}
if (kerberosPacket.MsgType == KerberosPacket.MessageType.krb_tgs_rep && spnParts.Count > 0)
{
username = string.Join("/", spnParts);
}
return(username, realm);
}
private (string username, string realm) GetUserAndRealm(KerberosPacket kerberosPacket, NetworkHost sourceHost, NetworkHost destinationHost)
{
string username = "";
string realm = "";
List <string> spnParts = new List <string>();
int lastInt = 0;
foreach (var item in kerberosPacket.AsnData)
{
if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.Integer)//Utils.ByteConverter.Asn1TypeTag.Integer
{
lastInt = (int)Utils.ByteConverter.ToUInt32(item.Item3);
}
else if (stringTypes.Contains(item.Item2))
{
string itemString = Utils.ByteConverter.ReadString(item.Item3);
//if(kerberosPacket.MsgType == KerberosPacket.MessageType.krb_ap_req) {
/** rfc1510 / http://web.mit.edu/freebsd/head/crypto/heimdal/lib/asn1/krb5.asn1
* KDC-REQ-BODY ::= SEQUENCE {
* kdc-options[0] KDCOptions,
* cname[1] PrincipalName OPTIONAL, -- Used only in AS-REQ
* realm[2] Realm, -- Server's realm
* -- Also client's in AS-REQ
* sname[3] PrincipalName OPTIONAL,
* from[4] KerberosTime OPTIONAL,
* till[5] KerberosTime OPTIONAL,
* rtime[6] KerberosTime OPTIONAL,
* nonce[7] krb5int32,
* etype[8] SEQUENCE OF ENCTYPE, -- EncryptionType,
* -- in preference order
* addresses[9] HostAddresses OPTIONAL,
* enc-authorization-data[10] EncryptedData OPTIONAL,
* -- Encrypted AuthorizationData encoding
* additional-tickets[11] SEQUENCE OF Ticket OPTIONAL
* }
**/
if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && hostnameRequestPaths.Contains(item.Item1) && itemString.EndsWith("$"))
{
string hostname = itemString.TrimEnd(new[] { '$' });
sourceHost.AddHostName(hostname, kerberosPacket.PacketTypeDescription);
//parameters.Add("Hostname (" + item.Item1 + ")", hostname);
realm = hostname;
}
else if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && hostnameResponsePaths.Contains(item.Item1) && itemString.EndsWith("$"))
{
string hostname = itemString.TrimEnd(new[] { '$' });
destinationHost.AddHostName(hostname, kerberosPacket.PacketTypeDescription);
//parameters.Add("Hostname (" + item.Item1 + ")", hostname);
realm = hostname;
}
else if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && (usernameRequestPaths.Contains(item.Item1) || usernameResponsePaths.Contains(item.Item1)) && !itemString.EndsWith("$"))
{
if (usernameRequestPaths.Contains(item.Item1))
{
base.MainPacketHandler.AddCredential(new NetworkCredential(sourceHost, destinationHost, "Kerberos", itemString, kerberosPacket.ParentFrame.Timestamp));
sourceHost.AddNumberedExtraDetail("Kerberos Username", itemString);
username = itemString;
}
else if (usernameResponsePaths.Contains(item.Item1))
{
base.MainPacketHandler.AddCredential(new NetworkCredential(destinationHost, sourceHost, "Kerberos", itemString, kerberosPacket.ParentFrame.Timestamp));
destinationHost.AddNumberedExtraDetail("Kerberos Username", itemString);
username = itemString;
}
#if DEBUG
else
{
System.Diagnostics.Debugger.Break();
}
#endif
//parameters.Add("Username (" + item.Item1 + ")", username);
}
else if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && domainPaths.Contains(item.Item1))
{
sourceHost.AddDomainName(itemString);
destinationHost.AddDomainName(itemString);
//parameters.Add("Realm (" + item.Item1 + ")", itemString);
realm = itemString;
}
else if (item.Item2 == Utils.ByteConverter.Asn1TypeTag.GeneralString && kerberosPacket.MsgType == KerberosPacket.MessageType.krb_tgs_rep && hostnameResponsePaths.Contains(item.Item1))
{
spnParts.Add(itemString);
}
else
{
//parameters.Add(item.Item1 + " " + Enum.GetName(typeof(Utils.ByteConverter.Asn1TypeTag), item.Item2), itemString);
}
}
}
if (kerberosPacket.MsgType == KerberosPacket.MessageType.krb_tgs_rep && spnParts.Count > 0)
{
username = string.Join("/", spnParts);
}
return(username, realm);
}