/// <summary>
/// Finds associated active key for these credentials and then
/// decrypts the envelope.
/// </summary>
/// <param name="machineInfo">Resultant Machine Information retrieved from envelope.</param>
public static CheckInStatus CheckIn(string username, string password, byte[] encryptedEnvelope, out Session session)
{
using (var db = new CSSDataContext())
{
var succeeded = false;
session = null;
MachineInformation machineInfo = null;
//Check if username/password is valid, and account is not banned/locked.
Login login;
LoginStatus loginStatus;
if (Login.TryGetAuthenticatedLogin(db, username, password, out login, out loginStatus) == false)
{
return(CheckInStatus.InvalidCredentials);
}
//Find user's session
var currentSession = login.FindCurrentSession();
//If session is not found, envelope cannot be decrypted.
if (currentSession == null)
{
return(CheckInStatus.InvalidCredentials);
}
try
{
//Retrieve the machine information
var activeKey = currentSession.ActiveKey;
var decryptedData = Encryption.DecryptRSA(encryptedEnvelope, activeKey.RSACspBlob.ToArray());
machineInfo = MachineInformation.Deserialize(decryptedData);
//Record machine info & match identities
bool wasMerged;
Identity identity;
Identity.MatchIdentity(db, login, machineInfo, out identity, out wasMerged);
if (login.Identity != identity)
{
login.Identity = identity;
}
if (VirtualMachineMarker.IsMachineInformationFromAVirtualMachine(db, machineInfo, login) == true)
{
if (Identity.CanUseVirtualMachine(db, login) == false)
{
return(CheckInStatus.VirtualMachineBlocked);
}
}
else
{
if (login.AllowVirtualMachineLogin == false)
{
login.AllowVirtualMachineLogin = true;
}
}
//Check if black box has timed out
if (!currentSession.ValidateSessionTimeout())
{
return(CheckInStatus.Timeout);
}
else //Otherwise, ensure session status is marked active
{
currentSession.SessionStatusType = SessionStatusEnum.Active;
}
//Verify the token is correct
if (machineInfo.Token != activeKey.Token)
{
return(CheckInStatus.InvalidHash);
}
//Verify the login is not banned
if (login.IsBanned)
{
return(CheckInStatus.InvalidCredentials);
}
//Check-in succeeded
if (currentSession.SessionStatusType == SessionStatusEnum.Active)
{
succeeded = true;
currentSession.DateLastCheckIn = DateTime.Now;
session = currentSession;
if (wasMerged == true)
{
return(CheckInStatus.AccountLinked);
}
else
{
return(CheckInStatus.Ok);
}
}
return(CheckInStatus.InvalidCredentials);
}
catch (Exception error)
{
Error.Write(error);
return(CheckInStatus.InvalidHash);
}
finally
{
//If not successful, mark session closed.
if (!succeeded)
{
currentSession.SessionStatusType = SessionStatusEnum.Closed;
}
db.SubmitChanges();
}
}
}