GabrielTofvesson
100f5a32be
Refactorings: * BinaryCollector -> BitWriter * BinaryDistributor -> BitReader Additions: * Output class for making serverside output pretty and more readable * Better RSA keys (private keys withheld) Changes: * Minor changes to all views and their rendering * Added corrective resizing to resize listener to prevent errant window sizes * Removed "default" language in favour of a purely priority-based system * NetContext now attempts to verify server identity before continuing to next context * Simplified common operations in Context * Minor updates to some layouts * Completed translations for english and swedish * Promise system now supports internal processing before notifying original caller * Bank interactor methods are now async * Added support for multiple accounts per user (separate repositories for money) * Removed test code from client program * Updated Database to support multiple accounts * Reimplemented RSA on the server side purely as an identity verification system on top of the networking layer (rather than part of the layer) * Added Account management endpoints * Added full support for System-sourced transactions * Added Account availability endpoint * Added verbose error responses
316 lines
16 KiB
C#
316 lines
16 KiB
C#
using Common;
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using Common.Cryptography.KeyExchange;
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using Server.Properties;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Numerics;
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using System.Text;
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using System.Threading.Tasks;
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using Tofvesson.Common;
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using Tofvesson.Crypto;
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namespace Server
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{
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class Program
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{
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private const string VERBOSE_RESPONSE = "@string/REMOTE_";
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public static void Main(string[] args)
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{
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// Set up fancy output
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Console.SetError(new TimeStampWriter(Console.Error, "HH:mm:ss.fff"));
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Console.SetOut(new TimeStampWriter(Console.Out, "HH:mm:ss.fff"));
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// Create a client session manager and allow sessions to remain valid for up to 5 minutes of inactivity (300 seconds)
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SessionManager manager = new SessionManager(300 * TimeSpan.TicksPerSecond, 20);
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// Initialize the database
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Database db = new Database("BankDB", "Resources");
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// Create a secure random provider and start getting RSA stuff
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CryptoRandomProvider random = new CryptoRandomProvider();
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Task<RSA> t = new Task<RSA>(() =>
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{
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RSA rsa = new RSA(Resources.e_0x100, Resources.n_0x100, Resources.d_0x100);
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if (rsa == null)
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{
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Output.Fatal("No RSA keys found! Server identity will not be verifiable!");
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Output.Info("Generating session-specific RSA-keys...");
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rsa = new RSA(128, 8, 7, 5);
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rsa.Save("0x100");
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Output.Info("Done!");
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}
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return rsa;
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});
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t.Start();
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// Local methods to simplify common operations
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bool ParseDataPair(string cmd, out string user, out string pass)
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{
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int idx = cmd.IndexOf(':');
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user = "";
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pass = "";
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if (idx == -1) return false;
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user = cmd.Substring(0, idx);
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try
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{
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user = user.FromBase64String();
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pass = cmd.Substring(idx + 1).FromBase64String();
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}
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catch
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{
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Output.Error($"Recieved problematic username or password! (User: \"{user}\")");
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return false;
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}
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return true;
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}
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int ParseDataSet(string cmd, out string[] data)
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{
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List<string> gen = new List<string>();
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int idx;
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while ((idx = cmd.IndexOf(':')) != -1)
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{
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try
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{
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gen.Add(cmd.Substring(0, idx).FromBase64String());
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}
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catch
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{
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data = null;
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return -1; // Hard error
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}
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cmd = cmd.Substring(idx + 1);
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}
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try
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{
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gen.Add(cmd.FromBase64String());
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}
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catch
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{
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data = null;
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return -1; // Hard error
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}
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data = gen.ToArray();
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return gen.Count;
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}
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string[] ParseCommand(string cmd, out long id)
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{
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int idx = cmd.IndexOf(':'), idx1;
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string sub;
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if (idx == -1 || !(sub = cmd.Substring(idx + 1)).Contains(':') || !long.TryParse(sub.Substring(0, idx1 = sub.IndexOf(':')), out id))
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{
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id = 0;
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return null;
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}
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return new string[] { cmd.Substring(0, idx), sub.Substring(idx1 + 1) };
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}
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string GenerateResponse(long id, dynamic d) => id + ":" + d.ToString();
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bool GetUser(string sid, out Database.User user)
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{
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user = manager.GetUser(sid);
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return user != null;
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}
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bool GetAccount(string name, Database.User user, out Database.Account acc)
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{
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acc = user.accounts.FirstOrDefault(a => a.name.Equals(name));
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return acc != null;
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}
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// Create server
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NetServer server = new NetServer(
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EllipticDiffieHellman.Curve25519(EllipticDiffieHellman.Curve25519_GeneratePrivate(random)),
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80,
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(string r, Dictionary<string, string> associations, ref bool s) =>
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{
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string[] cmd = ParseCommand(r, out long id);
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// Perform a signature verification by signing a nonce
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switch (cmd[0])
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{
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case "Auth":
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{
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if(!ParseDataPair(cmd[1], out string user, out string pass))
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{
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Output.Error($"Recieved problematic username or password! (User: \"{user}\")");
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return GenerateResponse(id, "ERROR");
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}
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Database.User usr = db.GetUser(user);
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if (usr == null || !usr.Authenticate(pass))
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{
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Output.Error("Authentcation failure for user: "+user);
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return GenerateResponse(id, "ERROR");
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}
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string sess = manager.GetSession(usr, "ERROR");
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Output.Positive("Authentication success for user: "+user+"\nSession: "+sess);
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associations["session"] = sess;
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return GenerateResponse(id, sess);
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}
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case "Logout":
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if (manager.Expire(cmd[1])) Output.Info("Prematurely expired session: " + cmd[1]);
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else Output.Error("Attempted to expire a non-existent session!");
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break;
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case "Avail":
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{
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try
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{
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string name = cmd[1].FromBase64String();
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Output.Info($"Performing availability check on name \"{name}\"");
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return GenerateResponse(id, !db.ContainsUser(name));
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}
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catch
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{
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Output.Error($"Recieved improperly formatted base64 string: \"{cmd[1]}\"");
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return GenerateResponse(id, false);
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}
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}
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case "Account_Create":
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{
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if (!ParseDataPair(cmd[1], out string session, out string name) || // Get session id and account name
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!GetUser(session, out var user) || // Get user associated with session id
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!GetAccount(name, user, out var account))
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{
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// Don't print input data to output in case sensitive information was included
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Output.Error($"Recieved problematic session id or account name!");
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return GenerateResponse(id, "ERROR");
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}
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user.accounts.Add(new Database.Account(user, 0, name));
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db.AddUser(user); // Notify database of the update
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return GenerateResponse(id, true);
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}
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case "Account_Transaction_Create":
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{
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bool systemInsert = false;
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string error = VERBOSE_RESPONSE;
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// Default values used here because compiler can't infer their valid parsing further down
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Database.User user = null;
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Database.Account account = null;
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Database.User tUser = null;
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Database.Account tAccount = null;
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decimal amount = 0;
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// Expected data (in order): SessionID, AccountName, TargetUserName, TargetAccountName, Amount, [message]
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// Do checks to make sure the data we have been given isn't completely silly
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if (ParseDataSet(cmd[1], out string[] data) < 5 || data.Length > 6)
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error += "general"; // General error (parse failed)
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else if (!GetUser(data[0], out user))
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error += "badsession"; // Bad session id (could not get user from session manager)
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else if (!GetAccount(data[1], user, out account))
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error += "badacc"; // Bad source account name
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else if (!db.ContainsUser(data[2]))
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error += "notargetusr"; // Target user could not be found
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else if (!GetAccount(data[3], tUser = db.GetUser(data[2]), out tAccount))
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error += "notargetacc"; // Target account could not be found
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else if ((!user.IsAdministrator && (systemInsert = (data[2].Equals(user.Name) && account.name.Equals(tAccount.name)))))
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error += "unprivsysins"; // Unprivileged request for system-sourced transfer
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else if (!decimal.TryParse(data[4], out amount) || amount < 0)
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error += "badbalance"; // Given sum was not a valid amount
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else if ((!systemInsert && amount > account.balance))
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error += "insufficient"; // Insufficient funds in the source account
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// Checks if an error ocurred and handles such a situation appropriately
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if(!error.Equals(VERBOSE_RESPONSE))
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{
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// Don't print input data to output in case sensitive information was included
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Output.Error($"Recieved problematic transaction data ({error}): {data?.ToList().ToString() ?? "Data could not be parsed"}");
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return GenerateResponse(id, $"ERROR:{error}");
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}
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// At this point, we know that all parsed variables above were successfully parsed and valid, therefore: no NREs
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// Parsed vars: 'user', 'account', 'tUser', 'tAccount', 'amount'
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// Perform and log the actual transaction
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return GenerateResponse(id,
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db.AddTransaction(
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systemInsert ? null : user.Name,
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tUser.Name,
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amount,
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account.name,
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tAccount.name,
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data.Length == 6 ? data[5] : null
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));
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}
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case "Account_Close":
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{
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Database.User user = null;
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Database.Account account = null;
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if (!ParseDataPair(cmd[1], out string session, out string name) || // Get session id and account name
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!GetUser(session, out user) || // Get user associated with session id
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!GetAccount(name, user, out account) ||
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account.balance != 0)
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{
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// Don't print input data to output in case sensitive information was included
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Output.Error($"Recieved problematic session id or account name!");
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// Possible errors: bad session id, bad account name, balance in account isn't 0
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return GenerateResponse(id, $"ERROR:{VERBOSE_RESPONSE} {(user==null? "badsession" : account==null? "badacc" : "hasbal")}");
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}
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break;
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}
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case "Reg":
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{
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if (!ParseDataPair(cmd[1], out string user, out string pass))
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{
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// Don't print input data to output in case sensitive information was included
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Output.Error($"Recieved problematic username or password!");
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return GenerateResponse(id, $"ERROR:{VERBOSE_RESPONSE}userpass");
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}
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// Cannot register an account with an existing username
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if (db.ContainsUser(user)) return GenerateResponse(id, $"ERROR:{VERBOSE_RESPONSE}exists");
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// Create the database user entry and generate a personal password salt
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Database.User u = new Database.User(user, pass, random.GetBytes(Math.Abs(random.NextShort() % 60) + 20), true);
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db.AddUser(u);
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// Generate a session token
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string sess = manager.GetSession(u, "ERROR");
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Output.Positive("Registered account: " + u.Name + "\nSession: "+sess);
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associations["session"] = sess;
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return GenerateResponse(id, sess);
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}
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case "Verify":
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{
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BitReader bd = new BitReader(Convert.FromBase64String(cmd[1]));
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try
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{
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while (!t.IsCompleted) System.Threading.Thread.Sleep(75);
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byte[] ser;
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using (BitWriter collector = new BitWriter())
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{
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collector.PushArray(t.Result.Serialize());
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collector.PushArray(t.Result.Encrypt(((BigInteger)bd.ReadUShort()).ToByteArray(), null, true));
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ser = collector.Finalize();
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}
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return GenerateResponse(id, Convert.ToBase64String(ser));
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}
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catch
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{
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return GenerateResponse(id, $"ERROR:{VERBOSE_RESPONSE}crypterr");
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}
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}
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default:
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return GenerateResponse(id, $"ERROR:{VERBOSE_RESPONSE}unwn"); // Unknown request
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}
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return null;
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},
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(c, b) => // Called every time a client connects or disconnects (conn + dc with every command/request)
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{
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// Output.Info($"Client has {(b ? "C" : "Disc")}onnected");
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if(!b && c.assignedValues.ContainsKey("session"))
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manager.Expire(c.assignedValues["session"]);
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});
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server.StartListening();
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Console.ReadLine();
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server.StopRunning();
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}
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}
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}
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