[Bug]: HMAC Alert

[STRATZ-Ken]

What did you expect to happen?

Login to complete successfully.

Instead of that, what actually happened?

Got a new stack trace error. Been using the same code for about 5 years now. Just upgraded from .Net 5 to 6.

2023-01-06 20:51:37.6663||DEBUG|X.X|[SteamKitDebug] - 0caaf55cc87c45cb9245822c8e8fe73d/TcpConnection: Unexpected exception propogated back to NetLoop: System.IO.IOException: Unable to decrypt incoming packet
 ---> System.Security.Cryptography.CryptographicException: NetFilterEncryption was unable to decrypt packet: HMAC from server did not match computed HMAC.
   at SteamKit2.CryptoHelper.SymmetricDecryptHMACIV(Byte[] input, Byte[] key, Byte[] hmacSecret) in C:\Git\Core\SteamKit2\src\SteamKit2\SteamKit2\Util\CryptoHelper.cs:line 352
   at SteamKit2.NetFilterEncryptionWithHMAC.ProcessIncoming(Byte[] data) in C:\Git\Core\SteamKit2\src\SteamKit2\SteamKit2\Networking\Steam3\NetFilterEncryptionWithHMAC.cs:line 33
   --- End of inner exception stack trace ---
   at SteamKit2.NetFilterEncryptionWithHMAC.ProcessIncoming(Byte[] data) in C:\Git\Core\SteamKit2\src\SteamKit2\SteamKit2\Networking\Steam3\NetFilterEncryptionWithHMAC.cs:line 40
   at SteamKit2.EnvelopeEncryptedConnection.OnNetMsgReceived(Object sender, NetMsgEventArgs e) in C:\Git\Core\SteamKit2\src\SteamKit2\SteamKit2\Networking\Steam3\EnvelopeEncryptedConnection.cs:line 74
   at SteamKit2.TcpConnection.NetLoop() in C:\Git\Core\SteamKit2\src\SteamKit2\SteamKit2\Networking\Steam3\TcpConnection.cs:line 301

Which operating system are you running on?

Windows

Which .NET Runtime are you running on?

.NET Core or .NET 5 or higher.

Version

.Net 6

Relevant log output

2023-01-06 20:51:35.5940||DEBUG|CaptainJackSteamKit.CaptainJackSteam|[SteamKitDebug] - ServerList: Resolving server list
2023-01-06 20:51:35.5940||DEBUG|CaptainJackSteamKit.CaptainJackSteam|[SteamKitDebug] - ServerList: Server list provider had no entries, will query SteamDirectory
2023-01-06 20:51:35.6422||DEBUG|CaptainJackSteamKit.CaptainJackSteam|Connecting to Steam at
2023-01-06 20:51:36.1713||DEBUG|CaptainJackSteamKit.CaptainJackSteam|[SteamKitDebug] - ServerList: Resolved 200 servers
2023-01-06 20:51:36.1713||DEBUG|CaptainJackSteamKit.CaptainJackSteam|[SteamKitDebug] - ServerList: Next server candidate: 162.254.192.87:27017 (Tcp)
2023-01-06 20:51:36.2264||DEBUG|CaptainJackSteamKit.CaptainJackSteam|[SteamKitDebug] - 0caaf55cc87c45cb9245822c8e8fe73d/TcpConnection: Connected to 162.254.192.87:27017
2023-01-06 20:51:36.2762||DEBUG|CaptainJackSteamKit.CaptainJackSteam|[SteamKitDebug] - 0caaf55cc87c45cb9245822c8e8fe73d/EnvelopeEncryptedConnection: Got encryption request. Universe: Public Protocol ver: 1
2023-01-06 20:51:36.3329||DEBUG|CaptainJackSteamKit.CaptainJackSteam|[SteamKitDebug] - 0caaf55cc87c45cb9245822c8e8fe73d/EnvelopeEncryptedConnection: Encryption result: OK
2023-01-06 20:51:36.3329||DEBUG|CaptainJackSteamKit.CaptainJackSteam|Connected to Steam!
2023-01-06 20:51:37.6369||DEBUG|CaptainJackSteamKit.CaptainJackSteam|[SteamKitDebug] - 0caaf55cc87c45cb9245822c8e8fe73d/NetFilterEncryptionWithHMAC: Unable to decrypt incoming packet: NetFilterEncryption was unable to decrypt packet: HMAC from server did not match computed HMAC.
2023-01-06 20:51:37.6663||DEBUG|CaptainJackSteamKit.CaptainJackSteam|[SteamKitDebug] - 0caaf55cc87c45cb9245822c8e8fe73d/TcpConnection: Unexpected exception propogated back to NetLoop: System.IO.IOException: Unable to decrypt incoming packet

Example Code

Log.Debug("Logging in to " + username + " " + password);
var details = new SteamUser.LogOnDetails()
{
Username = username,
Password = password
};

      _steamUser.LogOn(details);

Additional Information

This just started about 3 days ago. I thought it went away, but it just came back again.

[yaakov-h]

What version of SteamKit2 are you running? This sounds like an issue we fixed over a year ago in #1006.

[STRATZ-Ken]

You may be right. I am using an older version. I built a version on top of yours to allow proxies for connection via a param into the connect method. Will try to upgrade and report back.

[STRATZ-Ken]

Correct. Upgrading solved this.