Halflife: [GoldSource|client-side] Fix server file's hash getting.

[afwn90cj93201nixr2e1re]

There are some type's of file's which must be included into White-list of resource getting/checking.
From official readme.txt

There are several file type's in mp_consistency(.bsp, some sprites(.spr) and models (.mdl))

@2010kohtep and @SkillartzHD can provide more information 'bout packet's and messages.

Explain to @mikela-valve where must be filter for preverting dll/sys/txt and other types of files which not related to game hash getting, coz it's not good for privacy.(gdpr,CCPA e.t.c)

There is no reason to not add a filter the file extension.

It's seem's filter must be somewhere near this,

orig_MD5_Hash_File = (decltype(orig_MD5_Hash_File))elf_hook(hwso_fullpath.c_str(), hw_base, "MD5_Hash_File", (void*)HK_MD5_Hash_File);

bool (*orig_MD5_Hash_File)(uint8_t *digest, char *pszFileName, bool bUsefopen, bool bSeed, unsigned int *seed);
bool HK_MD5_Hash_File(uint8_t *digest, char *pszFileName, bool bUsefopen, bool bSeed, unsigned int *seed);

bool HK_MD5_Hash_File(uint8_t *digest, char *pszFileName, bool bUsefopen, bool bSeed, unsigned int *seed)
{

      ConsolePrintColor(0, 255,0, "[REQ] %s >> ", pszFileName);
// there must be filter by file extension.
    bool ret = orig_MD5_Hash_File(digest, pszFileName, bUsefopen, bSeed, seed);

    return ret;
}

[afwn90cj93201nixr2e1re]

@2010kohtep напиши ему если не сложно каким пакетом нужно пользоваться чтобы получить хэш. Я уже не помню, иды тоже рядом нет.

[2010kohtep]

MD5_Hash_File called in CL_SendConsistencyInfo function. These functions called when svc_resourcelist packet received.

[afwn90cj93201nixr2e1re]

@kisak-valve add label wont fix.

[afwn90cj93201nixr2e1re]

So, lemme explain.
Im trying to enter to the server, and getting ban, coz im using f8cking steam beta. WTF?
They checking demoplayer.dll hashes and check, if there no hashes in their list then ban every player.

83.222.96.154:27046 try to connect with steam beta client.
Then you gonna get ban.


We should send info only 'bout allowed file's extensions.

For more info you can read first post.

[Solokiller]

Is the server running the beta? If not, you shouldn't be connecting using the beta since there is no guarantee that the two versions of the game are compatible.

[afwn90cj93201nixr2e1re]

'r serious? or just trying to troll us?
There no checks for dll's in original server side. Only map md5 and mod model's.

Many server's use this third party plugins for checking user's files.

[Solokiller]

What server operators do on their server is up to them. If they want to implement anti-cheat themselves then they can do that. It seems to me that you were banned because you were running the beta which appears to them to be a modified version of the game.

Now if they can query information about any file on the client then that is a security issue, but if it's only possible to query the hash of libraries loaded by the engine/game for anti-cheat then that seems to me like it should be allowed.

[afwn90cj93201nixr2e1re]

Did you read first 2 posts? It's not feature request issue, it's security bug issue.
Yeah, i know that i must report it to h1. But i don't wanna do it. But kohtep done it at march or april, and still no answer.

Re-read first 2 post's and stop trolling.
They can query info 'bout any file, some type's of server's can get info 'bout system dll's with specific packet.

It seems to me that you were banned because you were running the beta which appears to them to be a modified version of the game.

I know why i getting ban. But if mikela release beta to stable and all steam player's gonna update game they gonna get ban from STEAM MASTERSERVER server's. On which server's i should play?
Let's say " don't play on this server's " to linux or mac player's too, which getting ban for not having .dll files boi. F8cking dll files from win version's.
This libraries doesn't loading from game engine, they can access to any files hash in folder. And to files which not loaded by game too. If i wanna place keys.txt or log.txt in game folder and gonna connect to some server i gonna get ban, coz they think that this is cheat files.

This server's placed on official steam masterserver, and we can't filter them. You can think that this one of the vulnerabilities from 1999 (like upload dll, exe, and other extensions files to client or download from server) that were not initially fixed. This is just one more case where we should add extensions check.

Can't read it anymore. Unsubscribed.
wow пожалуйста перестань нести ерунду, это никак не связано с детектом читов (он и так обходится на раз два), к которому вы привыкли, изучи клиент, и политики приватности из первого поста, а так же не стоит писать если не понимаешь сути issue, здесь помимо явной для вас части, есть часть с уязвимостью, которую не исправили в марте-апреле.

[Solokiller]

The hash doesn't provide any meaningful information to server operators. All they're getting is this:

original index of consistency entry in list
model bounds if the file is a model and the server requested this data OR first 4 bytes of the 16 byte md5 hash

That last detail might be a problem since the server isn't getting a full hash so it might be possible to circumvent the consistency check if you can guarantee the first 4 bytes are still valid, while still having different contents.

Regardless, even if the server is requesting a hash for a dll or a text file they won't be able to do anything with this information other than to verify that a file is what it's expected to be.

And i don't see how this could lead to being banned from the Steam master server list. If a server is doing a bad hash check and bans a player then that player can just go play on a server that isn't banning them.

Anybody who's doing these kind of checks will know that if they're requesting a hash for a dll they should compare the result to the hash for the dll, even if they're on Linux or Mac. The same goes for so and dylib files.