public string SessionIDOverride(CSC425Context db, String IPAddress)
{
// Check to make sure a user exists with the given name or email address
var user = db.Users.Where(u => u.Username.ToLower().Equals(UsernameOrEmail.ToLower())).FirstOrDefault();
if (user == null)
{
user = db.Users.Where(u => u.EmailAddress.ToLower().Equals(UsernameOrEmail.ToLower())).FirstOrDefault();
if (user == null)
{
return(JsonConvert.SerializeObject(new ReturnCode(404, "Not Found", "Username or Email Address is invalid")));
}
}
// User is properly logged in
if (user.SessionId.Equals(SessionID))
{
return(JsonConvert.SerializeObject(new ReturnCode(200, "OK", $"{SessionID}")));
}
// User failed log in
user.SessionId = null;
db.SaveChangesAsync();
return(JsonConvert.SerializeObject(new ReturnCode(401, "Unauthorized", $"Incorrect SessionID")));
}
public string AttemptLogin(CSC425Context db, String IPAddress)
{
// Check to make sure a user exists with the given name or email address
var user = db.Users.Where(u => u.Username.ToLower().Equals(UsernameOrEmail.ToLower())).FirstOrDefault();
if (user == null)
{
user = db.Users.Where(u => u.EmailAddress.ToLower().Equals(UsernameOrEmail.ToLower())).FirstOrDefault();
if (user == null)
{
return(JsonConvert.SerializeObject(new ReturnCode(404, "Not Found", "User with that name or email address does not exist")));
}
}
if (user.IsVerified)
{
if (user.LoginAttempts < 5)
{
// User exists, time to attempt log in
// Check if password is correct
var passwordToCheck = Security.SHA256(Security.Pepper + Password + user.Salt);
if (user.Password.Equals(passwordToCheck))
{
// Password is correct, Login successful
Logins login = new Logins();
login.UsersID = user.UserId;
login.Ipaddress = IPAddress;
login.LoginDate = DateTime.Now;
login.Used2Fa = false;
db.Logins.Add(login);
// Maybe replace this with JSON object that returns a session ID
var sessionID = Security.Generate(32);
user.SessionId = sessionID;
user.LoginAttempts = 0;
db.SaveChangesAsync();
return(JsonConvert.SerializeObject(new ReturnCode(200, "OK", $"{sessionID}")));
}
// Failed attempt should increment the counter
user.LoginAttempts = (user.LoginAttempts += 1);
db.SaveChangesAsync();
return(JsonConvert.SerializeObject(new ReturnCode(401, "Unauthorized", $"Password was incorrect")));
}
else // If you've entered the failed password 6 times
{
// Sets up a timed lockout
var lockout = 5; // Minutes to lock the account.
var task = $"DROP EVENT IF EXISTS {user.Username}_Lockout; CREATE EVENT IF NOT EXISTS {user.Username}_Lockout " +
$"ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL {lockout} MINUTE " +
$"ON COMPLETION PRESERVE " +
$"DO " +
$"UPDATE CSC425.Users SET Users.LoginAttempts = 0 WHERE Users.Username = \"{user.Username}\";";
db.Database.ExecuteSqlRawAsync(task);
return(JsonConvert.SerializeObject(new ReturnCode(401, "Unauthorized", $"Too many failed login attempts. Account locked for {lockout} minutes. Try logging in later.")));
}
}
else
{
return(JsonConvert.SerializeObject(new ReturnCode(401, "Unauthorized", $"Email Address not verified")));
}
}
