private static Ticket S4U2Self(KRB_CRED kirbi, string targetUser, string targetSPN, string outfile, bool ptt, string domainController = "", string altService = "")
{
// extract out the info needed for the TGS-REQ/S4U2Self execution
string userName = kirbi.enc_part.ticket_info[0].pname.name_string[0];
string domain = kirbi.enc_part.ticket_info[0].prealm;
Ticket ticket = kirbi.tickets[0];
byte[] clientKey = kirbi.enc_part.ticket_info[0].key.keyvalue;
Interop.KERB_ETYPE etype = (Interop.KERB_ETYPE)kirbi.enc_part.ticket_info[0].key.keytype;
string dcIP = Networking.GetDCIP(domainController);
if (String.IsNullOrEmpty(dcIP))
{
return(null);
}
Console.WriteLine("[*] Building S4U2self request for: '{0}@{1}'", userName, domain);
byte[] tgsBytes = TGS_REQ.NewTGSReq(userName, domain, userName, ticket, clientKey, etype, Interop.KERB_ETYPE.subkey_keymaterial, false, targetUser);
Console.WriteLine("[*] Sending S4U2self request");
byte[] response = Networking.SendBytes(dcIP, 88, tgsBytes);
if (response == null)
{
return(null);
}
// decode the supplied bytes to an AsnElt object
// false == ignore trailing garbage
AsnElt responseAsn = AsnElt.Decode(response, false);
// check the response value
int responseTag = responseAsn.TagValue;
if (responseTag == 13)
{
Console.WriteLine("[+] S4U2self success!");
// parse the response to an TGS-REP
TGS_REP rep = new TGS_REP(responseAsn);
// KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY = 8
byte[] outBytes = Crypto.KerberosDecrypt(etype, Interop.KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY, clientKey, rep.enc_part.cipher);
AsnElt ae = AsnElt.Decode(outBytes, false);
EncKDCRepPart encRepPart = new EncKDCRepPart(ae.Sub[0]);
// now build the final KRB-CRED structure
KRB_CRED cred = new KRB_CRED();
// add the ticket
cred.tickets.Add(rep.ticket);
// build the EncKrbCredPart/KrbCredInfo parts from the ticket and the data in the encRepPart
KrbCredInfo info = new KrbCredInfo();
// [0] add in the session key
info.key.keytype = encRepPart.key.keytype;
info.key.keyvalue = encRepPart.key.keyvalue;
// [1] prealm (domain)
info.prealm = encRepPart.realm;
// [2] pname (user)
info.pname.name_type = rep.cname.name_type;
info.pname.name_string = rep.cname.name_string;
// [3] flags
info.flags = encRepPart.flags;
// [4] authtime (not required)
// [5] starttime
info.starttime = encRepPart.starttime;
// [6] endtime
info.endtime = encRepPart.endtime;
// [7] renew-till
info.renew_till = encRepPart.renew_till;
// [8] srealm
info.srealm = encRepPart.realm;
// [9] sname
info.sname.name_type = encRepPart.sname.name_type;
info.sname.name_string = encRepPart.sname.name_string;
// add the ticket_info into the cred object
cred.enc_part.ticket_info.Add(info);
byte[] kirbiBytes = cred.Encode().Encode();
string kirbiString = Convert.ToBase64String(kirbiBytes);
Console.WriteLine("[*] Got a TGS for '{0}' to '{1}@{2}'", info.pname.name_string[0], info.sname.name_string[0], info.srealm);
Console.WriteLine("[*] base64(ticket.kirbi):\r\n");
if (TDNite.Program.wrapTickets)
{
// display the .kirbi base64, columns of 80 chararacters
foreach (string line in Helpers.Split(kirbiString, 80))
{
Console.WriteLine(" {0}", line);
}
}
else
{
Console.WriteLine(" {0}", kirbiString);
}
Console.WriteLine("");
if (!String.IsNullOrEmpty(outfile))
{
string filename = $"{Helpers.GetBaseFromFilename(outfile)}_{info.pname.name_string[0]}_to_{info.sname.name_string[0]}@{info.srealm}{Helpers.GetExtensionFromFilename(outfile)}";
filename = Helpers.MakeValidFileName(filename);
if (Helpers.WriteBytesToFile(filename, kirbiBytes))
{
Console.WriteLine("\r\n[*] Ticket written to {0}\r\n", filename);
}
}
return(rep.ticket);
}
else if (responseTag == 30)
{
// parse the response to an KRB-ERROR
KRB_ERROR error = new KRB_ERROR(responseAsn.Sub[0]);
Console.WriteLine("\r\n[X] KRB-ERROR ({0}) : {1}\r\n", error.error_code, (Interop.KERBEROS_ERROR)error.error_code);
}
else
{
Console.WriteLine("\r\n[X] Unknown application tag: {0}", responseTag);
}
return(null);
}
// to perform the 2 S4U2Self requests
private static KRB_CRED CrossDomainS4U2Self(string userName, string targetUser, string targetDomainController, Ticket ticket, byte[] clientKey, Interop.KERB_ETYPE etype, Interop.KERB_ETYPE requestEType, bool cross = true)
{
// die if can't get IP of DC
string dcIP = Networking.GetDCIP(targetDomainController);
if (String.IsNullOrEmpty(dcIP))
{
return(null);
}
Console.WriteLine("[*] Requesting the cross realm 'S4U2Self' for {0} from {1}", targetUser, targetDomainController);
byte[] tgsBytes = TGS_REQ.NewTGSReq(userName, targetUser, ticket, clientKey, etype, requestEType, cross);
Console.WriteLine("[*] Sending cross realm S4U2Self request");
byte[] response = Networking.SendBytes(dcIP, 88, tgsBytes);
if (response == null)
{
return(null);
}
// decode the supplied bytes to an AsnElt object
// false == ignore trailing garbage
AsnElt responseAsn = AsnElt.Decode(response, false);
// check the response value
int responseTag = responseAsn.TagValue;
if (responseTag == 13)
{
Console.WriteLine("[+] cross realm S4U2Self success!");
// parse the response to an TGS-REP
TGS_REP rep = new TGS_REP(responseAsn);
// KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY = 8
byte[] outBytes = Crypto.KerberosDecrypt(etype, Interop.KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY, clientKey, rep.enc_part.cipher);
AsnElt ae = AsnElt.Decode(outBytes, false);
EncKDCRepPart encRepPart = new EncKDCRepPart(ae.Sub[0]);
// now build the final KRB-CRED structure
KRB_CRED cred = new KRB_CRED();
// add the ticket
cred.tickets.Add(rep.ticket);
// build the EncKrbCredPart/KrbCredInfo parts from the ticket and the data in the encRepPart
KrbCredInfo info = new KrbCredInfo();
// [0] add in the session key
info.key.keytype = encRepPart.key.keytype;
info.key.keyvalue = encRepPart.key.keyvalue;
// [1] prealm (domain)
info.prealm = encRepPart.realm;
// [2] pname (user)
info.pname.name_type = rep.cname.name_type;
info.pname.name_string = rep.cname.name_string;
// [3] flags
info.flags = encRepPart.flags;
// [4] authtime (not required)
// [5] starttime
info.starttime = encRepPart.starttime;
// [6] endtime
info.endtime = encRepPart.endtime;
// [7] renew-till
info.renew_till = encRepPart.renew_till;
// [8] srealm
info.srealm = encRepPart.realm;
// [9] sname
info.sname.name_type = encRepPart.sname.name_type;
info.sname.name_string = encRepPart.sname.name_string;
// add the ticket_info into the cred object
cred.enc_part.ticket_info.Add(info);
byte[] kirbiBytes = cred.Encode().Encode();
PrintTicket(kirbiBytes, "base64(ticket.kirbi)");
KRB_CRED kirbi = new KRB_CRED(kirbiBytes);
return(kirbi);
}
else if (responseTag == 30)
{
// parse the response to an KRB-ERROR
KRB_ERROR error = new KRB_ERROR(responseAsn.Sub[0]);
Console.WriteLine("\r\n[X] KRB-ERROR ({0}) : {1}\r\n", error.error_code, (Interop.KERBEROS_ERROR)error.error_code);
}
else
{
Console.WriteLine("\r\n[X] Unknown application tag: {0}", responseTag);
}
return(null);
}
public static byte[] TGS(string userName, string domain, Ticket providedTicket, byte[] clientKey, Interop.KERB_ETYPE paEType, string service, Interop.KERB_ETYPE requestEType = Interop.KERB_ETYPE.subkey_keymaterial, string outfile = "", bool ptt = false, string domainController = "", bool display = true)
{
string dcIP = Networking.GetDCIP(domainController, display);
if (String.IsNullOrEmpty(dcIP))
{
return(null);
}
if (display)
{
if (requestEType == Interop.KERB_ETYPE.subkey_keymaterial)
{
Console.WriteLine("[*] Requesting default etypes (RC4_HMAC, AES[128/256]_CTS_HMAC_SHA1) for the service ticket", requestEType);
}
else
{
Console.WriteLine("[*] Requesting '{0}' etype for the service ticket", requestEType);
}
Console.WriteLine("[*] Building TGS-REQ request for: '{0}'", service);
}
byte[] tgsBytes = TGS_REQ.NewTGSReq(userName, domain, service, providedTicket, clientKey, paEType, requestEType, false, "");
byte[] response = Networking.SendBytes(dcIP, 88, tgsBytes);
if (response == null)
{
return(null);
}
// decode the supplied bytes to an AsnElt object
// false == ignore trailing garbage
AsnElt responseAsn = AsnElt.Decode(response, false);
// check the response value
int responseTag = responseAsn.TagValue;
if (responseTag == 13)
{
if (display)
{
Console.WriteLine("[+] TGS request successful!");
}
// parse the response to an TGS-REP
TGS_REP rep = new TGS_REP(responseAsn);
// KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY = 8
byte[] outBytes = Crypto.KerberosDecrypt(paEType, Interop.KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY, clientKey, rep.enc_part.cipher);
AsnElt ae = AsnElt.Decode(outBytes, false);
EncKDCRepPart encRepPart = new EncKDCRepPart(ae.Sub[0]);
// now build the final KRB-CRED structure
KRB_CRED cred = new KRB_CRED();
// add the ticket
cred.tickets.Add(rep.ticket);
// build the EncKrbCredPart/KrbCredInfo parts from the ticket and the data in the encRepPart
KrbCredInfo info = new KrbCredInfo();
// [0] add in the session key
info.key.keytype = encRepPart.key.keytype;
info.key.keyvalue = encRepPart.key.keyvalue;
// [1] prealm (domain)
info.prealm = encRepPart.realm;
// [2] pname (user)
info.pname.name_type = rep.cname.name_type;
info.pname.name_string = rep.cname.name_string;
// [3] flags
info.flags = encRepPart.flags;
// [4] authtime (not required)
// [5] starttime
info.starttime = encRepPart.starttime;
// [6] endtime
info.endtime = encRepPart.endtime;
// [7] renew-till
info.renew_till = encRepPart.renew_till;
// [8] srealm
info.srealm = encRepPart.realm;
// [9] sname
info.sname.name_type = encRepPart.sname.name_type;
info.sname.name_string = encRepPart.sname.name_string;
// add the ticket_info into the cred object
cred.enc_part.ticket_info.Add(info);
byte[] kirbiBytes = cred.Encode().Encode();
string kirbiString = Convert.ToBase64String(kirbiBytes);
if (ptt)
{
// pass-the-ticket -> import into LSASS
LSA.ImportTicket(kirbiBytes, new LUID());
}
if (display)
{
Console.WriteLine("[*] base64(ticket.kirbi):\r\n", kirbiString);
if (TDNite.Program.wrapTickets)
{
// display the .kirbi base64, columns of 80 chararacters
foreach (string line in Helpers.Split(kirbiString, 80))
{
Console.WriteLine(" {0}", line);
}
}
else
{
Console.WriteLine(" {0}", kirbiString);
}
KRB_CRED kirbi = new KRB_CRED(kirbiBytes);
LSA.DisplayTicket(kirbi);
}
if (!String.IsNullOrEmpty(outfile))
{
outfile = Helpers.MakeValidFileName(outfile);
if (Helpers.WriteBytesToFile(outfile, kirbiBytes))
{
if (display)
{
Console.WriteLine("\r\n[*] Ticket written to {0}\r\n", outfile);
}
}
}
return(kirbiBytes);
}
else if (responseTag == 30)
{
// parse the response to an KRB-ERROR
KRB_ERROR error = new KRB_ERROR(responseAsn.Sub[0]);
Console.WriteLine("\r\n[X] KRB-ERROR ({0}) : {1}\r\n", error.error_code, (Interop.KERBEROS_ERROR)error.error_code);
}
else
{
Console.WriteLine("\r\n[X] Unknown application tag: {0}", responseTag);
}
return(null);
}
