public static KrbCred WrapTicket(KrbTicket ticket, KrbCredInfo credInfo)
{
if (ticket is null)
{
throw new ArgumentNullException(nameof(ticket));
}
if (credInfo is null)
{
throw new ArgumentNullException(nameof(credInfo));
}
Now(out DateTimeOffset timestamp, out int usec);
var encPart = new KrbEncKrbCredPart
{
Timestamp = timestamp,
USec = usec,
TicketInfo = new[] { credInfo }
};
var cred = new KrbCred
{
EncryptedPart = new KrbEncryptedData {
Cipher = encPart.EncodeApplication()
},
Tickets = new[] { ticket },
};
return(cred);
}
internal static void Decode <T>(AsnReader reader, Asn1Tag expectedTag, out T decoded)
where T : KrbApReq, new()
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
decoded = new T();
AsnReader sequenceReader = reader.ReadSequence(expectedTag);
AsnReader explicitReader;
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 0));
if (!explicitReader.TryReadInt32(out decoded.ProtocolVersionNumber))
{
explicitReader.ThrowIfNotEmpty();
}
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 1));
if (!explicitReader.TryReadInt32(out decoded.MessageType))
{
explicitReader.ThrowIfNotEmpty();
}
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 2));
if (explicitReader.TryReadPrimitiveBitStringValue(out _, out ReadOnlyMemory <byte> tmpApOptions))
{
decoded.ApOptions = (ApOptions)tmpApOptions.AsLong();
}
else
{
decoded.ApOptions = (ApOptions)explicitReader.ReadBitString(out _).AsLong();
}
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 3));
KrbTicket.Decode <KrbTicket>(explicitReader, out decoded.Ticket);
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 4));
KrbEncryptedData.Decode <KrbEncryptedData>(explicitReader, out decoded.Authenticator);
explicitReader.ThrowIfNotEmpty();
sequenceReader.ThrowIfNotEmpty();
}
public static KrbTgsReq CreateTgsReq(
string spn,
KrbEncryptionKey tgtSessionKey,
KrbKdcRep kdcRep,
KdcOptions options,
KrbTicket user2UserTicket = null
)
{
var tgtApReq = CreateApReq(kdcRep, tgtSessionKey);
var pacOptions = new KrbPaPacOptions
{
Flags = PacOptions.ResourceBasedConstrainedDelegation | PacOptions.Claims | PacOptions.BranchAware
}.Encode();
var paData = new List <KrbPaData>()
{
new KrbPaData {
Type = PaDataType.PA_TGS_REQ,
Value = tgtApReq.EncodeApplication()
},
new KrbPaData {
Type = PaDataType.PA_PAC_OPTIONS,
Value = pacOptions.AsMemory()
}
};
var tgt = kdcRep.Ticket;
var sname = spn.Split('/', '@');
var tgs = new KrbTgsReq
{
PaData = paData.ToArray(),
Body = new KrbKdcReqBody
{
EType = KerberosConstants.ETypes.ToArray(),
KdcOptions = options,
Nonce = KerberosConstants.GetNonce(),
Realm = tgt.Realm,
SName = new KrbPrincipalName()
{
Type = PrincipalNameType.NT_SRV_HST,
Name = sname
},
Till = KerberosConstants.EndOfTime
},
};
if (options.HasFlag(KdcOptions.EncTktInSkey) && user2UserTicket != null)
{
tgs.Body.AdditionalTickets = new[] {
user2UserTicket
};
}
return(tgs);
}
public static KrbCred WrapTicket(KrbTicket ticket, KrbEncTicketPart encTicketPart)
{
if (ticket is null)
{
throw new ArgumentNullException(nameof(ticket));
}
if (encTicketPart is null)
{
throw new ArgumentNullException(nameof(encTicketPart));
}
KerberosConstants.Now(out DateTimeOffset timestamp, out int usec);
var encPart = new KrbEncKrbCredPart
{
Timestamp = timestamp,
USec = usec,
TicketInfo = new[]
{
new KrbCredInfo
{
Key = encTicketPart.Key,
AuthTime = encTicketPart.AuthTime,
EndTime = encTicketPart.EndTime,
Flags = encTicketPart.Flags,
PName = encTicketPart.CName,
Realm = encTicketPart.CRealm,
RenewTill = encTicketPart.RenewTill,
SName = ticket.SName,
SRealm = ticket.Realm,
StartTime = encTicketPart.StartTime,
}
}
};
var cred = new KrbCred
{
EncryptedPart = new KrbEncryptedData {
Cipher = encPart.EncodeApplication()
},
Tickets = new[] { ticket },
};
return(cred);
}
public static KrbCred WrapTicket(KrbTicket ticket, KrbEncTicketPart encTicketPart)
{
return(WrapTicket(
ticket,
new KrbCredInfo
{
Key = encTicketPart.Key,
AuthTime = encTicketPart.AuthTime,
EndTime = encTicketPart.EndTime,
Flags = encTicketPart.Flags,
PName = encTicketPart.CName,
Realm = encTicketPart.CRealm,
RenewTill = encTicketPart.RenewTill,
SName = ticket.SName,
SRealm = ticket.Realm,
StartTime = encTicketPart.StartTime,
}
));
}
public static async Task <T> GenerateServiceTicket <T>(ServiceTicketRequest request)
where T : KrbKdcRep, new()
{
var sessionKey = KrbEncryptionKey.Generate(request.ServicePrincipalKey.EncryptionType);
var authz = await GenerateAuthorizationData(request.Principal, request.ServicePrincipalKey);
var cname = KrbPrincipalName.FromPrincipal(request.Principal, realm: request.RealmName);
var flags = request.Flags;
if (request.Principal.SupportedPreAuthenticationTypes.Any())
{
// This is not strictly an accurate way of detecting if the user was pre-authenticated.
// If pre-auth handlers are registered and the principal has PA-Types available, a request
// will never make it to this point without getting authenticated.
//
// However if no pre-auth handlers are registered, then the PA check is skipped
// and this isn't technically accurate anymore.
//
// TODO: this should tie into the make-believe policy check being used in the
// auth handler section
flags |= TicketFlags.EncryptedPreAuthentication | TicketFlags.PreAuthenticated;
}
var addresses = request.Addresses;
if (addresses == null)
{
addresses = new KrbHostAddress[0];
}
var encTicketPart = new KrbEncTicketPart()
{
CName = cname,
Key = sessionKey,
AuthTime = request.Now,
StartTime = request.StartTime,
EndTime = request.EndTime,
CRealm = request.RealmName,
Flags = flags,
AuthorizationData = authz.ToArray(),
CAddr = addresses.ToArray(),
Transited = new KrbTransitedEncoding()
};
if (flags.HasFlag(TicketFlags.Renewable))
{
// RenewTill should never increase if it was set previously even if this is a renewal pass
encTicketPart.RenewTill = request.RenewTill;
}
var ticket = new KrbTicket()
{
Realm = request.RealmName,
SName = KrbPrincipalName.FromPrincipal(
request.ServicePrincipal,
PrincipalNameType.NT_SRV_INST,
request.RealmName
),
EncryptedPart = KrbEncryptedData.Encrypt(
encTicketPart.EncodeApplication(),
request.ServicePrincipalKey,
KeyUsage.Ticket
)
};
KrbEncKdcRepPart encKdcRepPart;
if (typeof(T) == typeof(KrbAsRep))
{
encKdcRepPart = new KrbEncAsRepPart();
}
else if (typeof(T) == typeof(KrbTgsRep))
{
encKdcRepPart = new KrbEncTgsRepPart();
}
else
{
throw new InvalidOperationException($"Requested Service Ticket type is neither KrbAsRep nor KrbTgsRep. Type: {typeof(T)}");
}
encKdcRepPart.AuthTime = encTicketPart.AuthTime;
encKdcRepPart.StartTime = encTicketPart.StartTime;
encKdcRepPart.EndTime = encTicketPart.EndTime;
encKdcRepPart.RenewTill = encTicketPart.RenewTill;
encKdcRepPart.KeyExpiration = request.Principal.Expires;
encKdcRepPart.Realm = request.RealmName;
encKdcRepPart.SName = ticket.SName;
encKdcRepPart.Flags = encTicketPart.Flags;
encKdcRepPart.CAddr = encTicketPart.CAddr;
encKdcRepPart.Key = sessionKey;
encKdcRepPart.Nonce = KerberosConstants.GetNonce();
encKdcRepPart.LastReq = new[] { new KrbLastReq {
Type = 0, Value = request.Now
} };
encKdcRepPart.EncryptedPaData = new KrbMethodData
{
MethodData = new[]
{
new KrbPaData
{
Type = PaDataType.PA_SUPPORTED_ETYPES,
Value = request.Principal.SupportedEncryptionTypes.AsReadOnly(littleEndian: true).AsMemory()
}
}
};
encKdcRepPart.EncodeApplication();
var rep = new T
{
CName = cname,
CRealm = request.RealmName,
MessageType = MessageType.KRB_AS_REP,
Ticket = ticket,
EncPart = KrbEncryptedData.Encrypt(
encKdcRepPart.EncodeApplication(),
request.EncryptedPartKey,
encKdcRepPart.KeyUsage
)
};
return(rep);
}
internal static void Decode <T>(AsnReader reader, Asn1Tag expectedTag, out T decoded)
where T : KrbKdcRep, new()
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
decoded = new T();
AsnReader sequenceReader = reader.ReadSequence(expectedTag);
AsnReader explicitReader;
AsnReader collectionReader;
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 0));
if (!explicitReader.TryReadInt32(out decoded.ProtocolVersionNumber))
{
explicitReader.ThrowIfNotEmpty();
}
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 1));
if (!explicitReader.TryReadInt32(out decoded.MessageType))
{
explicitReader.ThrowIfNotEmpty();
}
explicitReader.ThrowIfNotEmpty();
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 2)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 2));
// Decode SEQUENCE OF for PaData
{
collectionReader = explicitReader.ReadSequence();
var tmpList = new List <KrbPaData>();
KrbPaData tmpItem;
while (collectionReader.HasData)
{
KrbPaData.Decode <KrbPaData>(collectionReader, out tmpItem);
tmpList.Add(tmpItem);
}
decoded.PaData = tmpList.ToArray();
}
explicitReader.ThrowIfNotEmpty();
}
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 3));
decoded.CRealm = explicitReader.ReadCharacterString(UniversalTagNumber.GeneralString);
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 4));
KrbPrincipalName.Decode <KrbPrincipalName>(explicitReader, out decoded.CName);
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 5));
KrbTicket.Decode <KrbTicket>(explicitReader, out decoded.Ticket);
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 6));
KrbEncryptedData.Decode <KrbEncryptedData>(explicitReader, out decoded.EncPart);
explicitReader.ThrowIfNotEmpty();
sequenceReader.ThrowIfNotEmpty();
}
internal static void Decode <T>(AsnReader reader, Asn1Tag expectedTag, out T decoded)
where T : KrbCred, new()
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
decoded = new T();
AsnReader sequenceReader = reader.ReadSequence(expectedTag);
AsnReader explicitReader;
AsnReader collectionReader;
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 0));
if (!explicitReader.TryReadInt32(out int tmpProtocolVersionNumber))
{
explicitReader.ThrowIfNotEmpty();
}
decoded.ProtocolVersionNumber = tmpProtocolVersionNumber;
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 1));
if (!explicitReader.TryReadInt32(out MessageType tmpMessageType))
{
explicitReader.ThrowIfNotEmpty();
}
decoded.MessageType = tmpMessageType;
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 2));
// Decode SEQUENCE OF for Tickets
{
collectionReader = explicitReader.ReadSequence();
var tmpList = new List <KrbTicket>();
KrbTicket tmpItem;
while (collectionReader.HasData)
{
KrbTicket.Decode <KrbTicket>(collectionReader, out KrbTicket tmp);
tmpItem = tmp;
tmpList.Add(tmpItem);
}
decoded.Tickets = tmpList.ToArray();
}
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 3));
KrbEncryptedData.Decode <KrbEncryptedData>(explicitReader, out KrbEncryptedData tmpEncryptedPart);
decoded.EncryptedPart = tmpEncryptedPart;
explicitReader.ThrowIfNotEmpty();
sequenceReader.ThrowIfNotEmpty();
}
public static async Task <T> GenerateServiceTicket <T>(ServiceTicketRequest request)
where T : KrbKdcRep, new()
{
if (request.EncryptedPartKey == null)
{
throw new ArgumentException("A session key must be provided to encrypt the response", nameof(request.EncryptedPartKey));
}
if (request.Principal == null)
{
throw new ArgumentException("A Principal identity must be provided", nameof(request.Principal));
}
if (request.ServicePrincipal == null)
{
throw new ArgumentException("A service principal must be provided", nameof(request.ServicePrincipal));
}
if (request.ServicePrincipalKey == null)
{
throw new ArgumentException("A service principal key must be provided", nameof(request.ServicePrincipalKey));
}
var authz = await GenerateAuthorizationData(request.Principal, request);
var sessionKey = KrbEncryptionKey.Generate(request.ServicePrincipalKey.EncryptionType);
var encTicketPart = CreateEncTicketPart(request, authz.ToArray(), sessionKey);
var ticket = new KrbTicket()
{
Realm = request.RealmName,
SName = KrbPrincipalName.FromPrincipal(
request.ServicePrincipal,
PrincipalNameType.NT_SRV_INST,
request.RealmName
),
EncryptedPart = KrbEncryptedData.Encrypt(
encTicketPart.EncodeApplication(),
request.ServicePrincipalKey,
KeyUsage.Ticket
)
};
KrbEncKdcRepPart encKdcRepPart;
KeyUsage keyUsage;
if (typeof(T) == typeof(KrbAsRep))
{
encKdcRepPart = new KrbEncAsRepPart();
keyUsage = KeyUsage.EncAsRepPart;
}
else if (typeof(T) == typeof(KrbTgsRep))
{
encKdcRepPart = new KrbEncTgsRepPart();
keyUsage = request.EncryptedPartKey.Usage ?? KeyUsage.EncTgsRepPartSessionKey;
}
else
{
throw new InvalidOperationException($"Requested Service Ticket type is neither KrbAsRep nor KrbTgsRep. Type: {typeof(T)}");
}
encKdcRepPart.AuthTime = encTicketPart.AuthTime;
encKdcRepPart.StartTime = encTicketPart.StartTime;
encKdcRepPart.EndTime = encTicketPart.EndTime;
encKdcRepPart.RenewTill = encTicketPart.RenewTill;
encKdcRepPart.KeyExpiration = request.Principal.Expires;
encKdcRepPart.Realm = request.RealmName;
encKdcRepPart.SName = ticket.SName;
encKdcRepPart.Flags = encTicketPart.Flags;
encKdcRepPart.CAddr = encTicketPart.CAddr;
encKdcRepPart.Key = sessionKey;
encKdcRepPart.Nonce = request.Nonce;
encKdcRepPart.LastReq = new[] { new KrbLastReq {
Type = 0, Value = request.Now
} };
encKdcRepPart.EncryptedPaData = new KrbMethodData
{
MethodData = new[]
{
new KrbPaData
{
Type = PaDataType.PA_SUPPORTED_ETYPES,
Value = request.Principal.SupportedEncryptionTypes.AsReadOnly(littleEndian: true).AsMemory()
}
}
};
var cname = KrbPrincipalName.FromPrincipal(request.Principal, realm: request.RealmName);
var rep = new T
{
CName = cname,
CRealm = request.RealmName,
MessageType = MessageType.KRB_AS_REP,
Ticket = ticket,
EncPart = KrbEncryptedData.Encrypt(
encKdcRepPart.EncodeApplication(),
request.EncryptedPartKey,
keyUsage
)
};
return(rep);
}
private static ServiceTicketRequest GenerateServiceTicket <T>(
ServiceTicketRequest request,
out KrbEncTicketPart encTicketPart,
out KrbTicket ticket,
out KrbEncKdcRepPart encKdcRepPart,
out KeyUsage keyUsage,
out MessageType messageType
)
where T : KrbKdcRep, new()
{
if (request.Principal == null)
{
throw new InvalidOperationException("A Principal identity must be provided");
}
if (request.ServicePrincipal == null)
{
throw new InvalidOperationException("A service principal must be provided");
}
if (request.ServicePrincipalKey == null)
{
throw new InvalidOperationException("A service principal key must be provided");
}
var authz = GenerateAuthorizationData(request);
var sessionKey = KrbEncryptionKey.Generate(request.PreferredClientEType ?? request.ServicePrincipalKey.EncryptionType);
encTicketPart = CreateEncTicketPart(request, authz.ToArray(), sessionKey);
bool appendRealm = false;
if (request.ServicePrincipal.PrincipalName.Contains("/"))
{
appendRealm = true;
}
ticket = new KrbTicket()
{
Realm = request.RealmName,
SName = KrbPrincipalName.FromPrincipal(
request.ServicePrincipal,
PrincipalNameType.NT_SRV_INST,
appendRealm ? null : request.RealmName
),
EncryptedPart = KrbEncryptedData.Encrypt(
encTicketPart.EncodeApplication(),
request.ServicePrincipalKey,
KeyUsage.Ticket
)
};
if (typeof(T) == typeof(KrbAsRep))
{
encKdcRepPart = new KrbEncAsRepPart();
keyUsage = KeyUsage.EncAsRepPart;
messageType = MessageType.KRB_AS_REP;
}
else if (typeof(T) == typeof(KrbTgsRep))
{
encKdcRepPart = new KrbEncTgsRepPart();
keyUsage = request.EncryptedPartKey?.Usage ?? KeyUsage.EncTgsRepPartSessionKey;
messageType = MessageType.KRB_TGS_REP;
}
else
{
throw new InvalidOperationException($"Requested Service Ticket type is neither KrbAsRep nor KrbTgsRep. Type: {typeof(T)}");
}
encKdcRepPart.AuthTime = encTicketPart.AuthTime;
encKdcRepPart.StartTime = encTicketPart.StartTime;
encKdcRepPart.EndTime = encTicketPart.EndTime;
encKdcRepPart.RenewTill = encTicketPart.RenewTill;
encKdcRepPart.KeyExpiration = request.Principal.Expires;
encKdcRepPart.Realm = request.RealmName;
encKdcRepPart.SName = ticket.SName;
encKdcRepPart.Flags = encTicketPart.Flags;
encKdcRepPart.CAddr = encTicketPart.CAddr;
encKdcRepPart.Key = sessionKey;
encKdcRepPart.Nonce = request.Nonce;
encKdcRepPart.LastReq = new[] { new KrbLastReq {
Type = 0, Value = request.Now
} };
encKdcRepPart.EncryptedPaData = new KrbMethodData
{
MethodData = new[]
{
new KrbPaData
{
Type = PaDataType.PA_SUPPORTED_ETYPES,
Value = request.Principal.SupportedEncryptionTypes.AsReadOnly(littleEndian: true).AsMemory()
}
}
};
return(request);
}
internal static void Decode <T>(AsnReader reader, Asn1Tag expectedTag, out T decoded)
where T : KrbKdcReqBody, new()
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
decoded = new T();
AsnReader sequenceReader = reader.ReadSequence(expectedTag);
AsnReader explicitReader;
AsnReader collectionReader;
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 0));
if (explicitReader.TryReadPrimitiveBitStringValue(out _, out ReadOnlyMemory <byte> tmpKdcOptions))
{
decoded.KdcOptions = (KdcOptions)tmpKdcOptions.AsLong();
}
else
{
decoded.KdcOptions = (KdcOptions)explicitReader.ReadBitString(out _).AsLong();
}
explicitReader.ThrowIfNotEmpty();
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 1)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 1));
KrbPrincipalName.Decode <KrbPrincipalName>(explicitReader, out KrbPrincipalName tmpCName);
decoded.CName = tmpCName;
explicitReader.ThrowIfNotEmpty();
}
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 2));
decoded.Realm = explicitReader.ReadCharacterString(UniversalTagNumber.GeneralString);
explicitReader.ThrowIfNotEmpty();
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 3)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 3));
KrbPrincipalName.Decode <KrbPrincipalName>(explicitReader, out KrbPrincipalName tmpSName);
decoded.SName = tmpSName;
explicitReader.ThrowIfNotEmpty();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 4)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 4));
decoded.From = explicitReader.ReadGeneralizedTime();
explicitReader.ThrowIfNotEmpty();
}
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 5));
decoded.Till = explicitReader.ReadGeneralizedTime();
explicitReader.ThrowIfNotEmpty();
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 6)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 6));
decoded.RTime = explicitReader.ReadGeneralizedTime();
explicitReader.ThrowIfNotEmpty();
}
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 7));
if (!explicitReader.TryReadInt32(out int tmpNonce))
{
explicitReader.ThrowIfNotEmpty();
}
decoded.Nonce = tmpNonce;
explicitReader.ThrowIfNotEmpty();
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 8));
// Decode SEQUENCE OF for EType
{
collectionReader = explicitReader.ReadSequence();
var tmpList = new List <EncryptionType>();
EncryptionType tmpItem;
while (collectionReader.HasData)
{
if (!collectionReader.TryReadInt32(out EncryptionType tmp))
{
collectionReader.ThrowIfNotEmpty();
}
tmpItem = tmp;
tmpList.Add(tmpItem);
}
decoded.EType = tmpList.ToArray();
}
explicitReader.ThrowIfNotEmpty();
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 9)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 9));
// Decode SEQUENCE OF for Addresses
{
collectionReader = explicitReader.ReadSequence();
var tmpList = new List <KrbHostAddress>();
KrbHostAddress tmpItem;
while (collectionReader.HasData)
{
KrbHostAddress.Decode <KrbHostAddress>(collectionReader, out KrbHostAddress tmp);
tmpItem = tmp;
tmpList.Add(tmpItem);
}
decoded.Addresses = tmpList.ToArray();
}
explicitReader.ThrowIfNotEmpty();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 10)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 10));
KrbEncryptedData.Decode <KrbEncryptedData>(explicitReader, out KrbEncryptedData tmpEncAuthorizationData);
decoded.EncAuthorizationData = tmpEncAuthorizationData;
explicitReader.ThrowIfNotEmpty();
}
if (sequenceReader.HasData && sequenceReader.PeekTag().HasSameClassAndValue(new Asn1Tag(TagClass.ContextSpecific, 11)))
{
explicitReader = sequenceReader.ReadSequence(new Asn1Tag(TagClass.ContextSpecific, 11));
// Decode SEQUENCE OF for AdditionalTickets
{
collectionReader = explicitReader.ReadSequence();
var tmpList = new List <KrbTicket>();
KrbTicket tmpItem;
while (collectionReader.HasData)
{
KrbTicket.Decode <KrbTicket>(collectionReader, out KrbTicket tmp);
tmpItem = tmp;
tmpList.Add(tmpItem);
}
decoded.AdditionalTickets = tmpList.ToArray();
}
explicitReader.ThrowIfNotEmpty();
}
sequenceReader.ThrowIfNotEmpty();
}
public static async Task <T> GenerateServiceTicket <T>(ServiceTicketRequest request)
where T : KrbKdcRep, new()
{
if (request.EncryptedPartKey == null)
{
throw new ArgumentException("A session key must be provided to encrypt the response", nameof(request.EncryptedPartKey));
}
if (request.Principal == null)
{
throw new ArgumentException("A Principal identity must be provided", nameof(request.Principal));
}
if (request.ServicePrincipal == null)
{
throw new ArgumentException("A service principal must be provided", nameof(request.ServicePrincipal));
}
if (request.ServicePrincipalKey == null)
{
throw new ArgumentException("A service principal key must be provided", nameof(request.ServicePrincipalKey));
}
var authz = await GenerateAuthorizationData(request.Principal, request);
var cname = KrbPrincipalName.FromPrincipal(request.Principal, realm: request.RealmName);
var sessionKey = KrbEncryptionKey.Generate(request.ServicePrincipalKey.EncryptionType);
var flags = request.Flags;
if (request.PreAuthenticationData?.Any(r => r.Type == PaDataType.PA_REQ_ENC_PA_REP) ?? false)
{
flags |= TicketFlags.EncryptedPreAuthentication;
}
var addresses = request.Addresses;
if (addresses == null)
{
addresses = new KrbHostAddress[0];
}
var encTicketPart = new KrbEncTicketPart()
{
CName = cname,
Key = sessionKey,
AuthTime = request.Now,
StartTime = request.StartTime,
EndTime = request.EndTime,
CRealm = request.RealmName,
Flags = flags,
AuthorizationData = authz.ToArray(),
CAddr = addresses.ToArray(),
Transited = new KrbTransitedEncoding()
};
if (flags.HasFlag(TicketFlags.Renewable))
{
// RenewTill should never increase if it was set previously even if this is a renewal pass
encTicketPart.RenewTill = request.RenewTill;
}
var ticket = new KrbTicket()
{
Realm = request.RealmName,
SName = KrbPrincipalName.FromPrincipal(
request.ServicePrincipal,
PrincipalNameType.NT_SRV_INST,
request.RealmName
),
EncryptedPart = KrbEncryptedData.Encrypt(
encTicketPart.EncodeApplication(),
request.ServicePrincipalKey,
KeyUsage.Ticket
)
};
KrbEncKdcRepPart encKdcRepPart;
if (typeof(T) == typeof(KrbAsRep))
{
encKdcRepPart = new KrbEncAsRepPart();
}
else if (typeof(T) == typeof(KrbTgsRep))
{
encKdcRepPart = new KrbEncTgsRepPart();
}
else
{
throw new InvalidOperationException($"Requested Service Ticket type is neither KrbAsRep nor KrbTgsRep. Type: {typeof(T)}");
}
encKdcRepPart.AuthTime = encTicketPart.AuthTime;
encKdcRepPart.StartTime = encTicketPart.StartTime;
encKdcRepPart.EndTime = encTicketPart.EndTime;
encKdcRepPart.RenewTill = encTicketPart.RenewTill;
encKdcRepPart.KeyExpiration = request.Principal.Expires;
encKdcRepPart.Realm = request.RealmName;
encKdcRepPart.SName = ticket.SName;
encKdcRepPart.Flags = encTicketPart.Flags;
encKdcRepPart.CAddr = encTicketPart.CAddr;
encKdcRepPart.Key = sessionKey;
encKdcRepPart.Nonce = request.Nonce;
encKdcRepPart.LastReq = new[] { new KrbLastReq {
Type = 0, Value = request.Now
} };
encKdcRepPart.EncryptedPaData = new KrbMethodData
{
MethodData = new[]
{
new KrbPaData
{
Type = PaDataType.PA_SUPPORTED_ETYPES,
Value = request.Principal.SupportedEncryptionTypes.AsReadOnly(littleEndian: true).AsMemory()
}
}
};
var rep = new T
{
CName = cname,
CRealm = request.RealmName,
MessageType = MessageType.KRB_AS_REP,
Ticket = ticket,
EncPart = KrbEncryptedData.Encrypt(
encKdcRepPart.EncodeApplication(),
request.EncryptedPartKey,
encKdcRepPart.KeyUsage
)
};
return(rep);
}
