From c656ba9945ccf7defe83cc2cc9a9483d95d55bb1 Mon Sep 17 00:00:00 2001
From: Richard Blonski <48651647+RichardBlonski@users.noreply.github.com>
Date: Thu, 2 Jul 2026 07:34:52 +0300
Subject: [PATCH] Semi Port - Add Wine/Linux users CID to an ignore list
(#96484)
## About The Pull Request
This PR attempts to somewhat port
https://github.com/cmss13-devs/cmss13/pull/11252
In order to add Wine/Linux CID into an ignore list to stop the
`Your ComputerID has already logged in with another key this round,
please log out of this one NOW or risk being banned!`
Jumpscare message from appearing and log users which connect with
ignored CID's to admins properly.
### Testing the Pull Reuqest
I've attempted to test the PR locally, but I have been unable to
replicate the duplicated CID message, so this might need to be **test
merged** if approved.
In addition, please review the code, my experience with Byond is very
limited so feel free to edit, commit, or requested changes per need.
## Why It's Good For The Game
If two players with the same CID (such as the case with players who play
using Wine), the joining players will get a pop-up saying they are using
the same CID and get a **scary** message that they risk getting banned
for multiboxing if they don't log off.
Experienced game staff, most of the time already know to ignore the CID
`4055623708` which is often thrown by Wine.
However, players could abuse this fact to still and try to multibox for
whatever reason, and even if a legit Linux player uses this CID, giving
the admins a separate log for it is useful, to be distinct from normal
multibox messages.
`MULTIKEYING: [key_name(src)] Connecting player joined with IGNORED CID
[computer_id].`
## Changelog
:cl: Richard Blonski
admin: Added Ignored CIDs, a message will appear when a player joins
with an Ignored CID.
/:cl:
---
code/controllers/configuration/entries/general.dm | 3 +++
code/controllers/subsystem/stickyban.dm | 10 +++++++++-
code/modules/client/client_procs.dm | 8 ++++++++
config/config.txt | 5 +++++
4 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/code/controllers/configuration/entries/general.dm b/code/controllers/configuration/entries/general.dm
index 71516fdd24f..1b21893807d 100644
--- a/code/controllers/configuration/entries/general.dm
+++ b/code/controllers/configuration/entries/general.dm
@@ -809,3 +809,6 @@
/datum/config_entry/string/policy_json_path
default = "policy.json"
+
+/datum/config_entry/number_list/ignored_cids
+ default = list()
diff --git a/code/controllers/subsystem/stickyban.dm b/code/controllers/subsystem/stickyban.dm
index e19c574a9fa..d08f08d1791 100644
--- a/code/controllers/subsystem/stickyban.dm
+++ b/code/controllers/subsystem/stickyban.dm
@@ -4,13 +4,21 @@ SUBSYSTEM_DEF(stickyban)
var/list/cache = list()
var/list/dbcache = list()
- var/list/confirmed_exempt = list()
+ var/list/ignored_cids = list() // will be used as numeric-keyed map
var/dbcacheexpire = 0
/datum/controller/subsystem/stickyban/Initialize()
+ // load IGNORED_CIDS as number_list into a fast lookup map
+ var/list/ignored_conf = CONFIG_GET(number_list/ignored_cids)
+ if (ignored_conf && ignored_conf.len)
+ for (var/num in ignored_conf)
+ if (isnum(num))
+ ignored_cids[num2text(num)] = TRUE
+
if (length(GLOB.stickybanadminexemptions))
restore_stickybans()
+
var/list/bannedkeys = sticky_banned_ckeys()
//sanitize the sticky ban list
diff --git a/code/modules/client/client_procs.dm b/code/modules/client/client_procs.dm
index 20693fc1bed..6ac51bd14d3 100644
--- a/code/modules/client/client_procs.dm
+++ b/code/modules/client/client_procs.dm
@@ -435,7 +435,15 @@ GLOBAL_LIST_INIT(unrecommended_builds, list(
tgui_say.initialize()
if(alert_mob_dupe_login && !holder)
+ // Notify admins if the connecting player's CID is configured to be ignored by stickybans
+ if (SSstickyban && (computer_id in SSstickyban.ignored_cids))
+ message_admins("MULTIKEYING: [key_name_admin(src)] Connecting player joined with IGNORED CID [computer_id].")
+ log_admin_private("MULTIKEYING: [key_name(src)] Connecting player joined with IGNORED CID [computer_id].")
+ return
+
+ // If the CID is not ignored, notify the player with the pop-up.
var/dupe_login_message = "Your ComputerID has already logged in with another key this round, please log out of this one NOW or risk being banned!"
+ // Notify admins if the connecting player's CID is a duplicate of another player's CID
if (alert_admin_multikey)
dupe_login_message += "\nAdmins have been informed."
message_admins(span_danger("MULTIKEYING: [key_name_admin(src)] has a matching CID+IP with another player and is clearly multikeying. They have been warned to leave the server or risk getting banned."))
diff --git a/config/config.txt b/config/config.txt
index 18e5329c69b..92ec99d8426 100644
--- a/config/config.txt
+++ b/config/config.txt
@@ -655,3 +655,8 @@ GENERATE_ASSETS_IN_INIT
## Path from the config folder to the policy json
POLICY_JSON_PATH policy.json
+# Which CIDs will not be considered for stickybans. This is the default CID that Wine spits out,
+# and for the purpose of not default banning all Linux players, we'll just ignore it.
+# People can spoof this CID and ignore that element of stickybans forever, but they can equally
+# just keep generating new ones. Kind of doesn't matter.
+IGNORED_CIDS 4055623708