CSB SteamID Validator enforces clean authentication on entry. At client_authorized it inspects the SteamID and rejects the ones that shouldn't be playing: IDs stuck at STEAM_ID_PENDING past a timeout, LAN and no-steam tokens, strings that don't match the STEAM_x:y:z shape, and any SteamID already present on the server (the duplicate-ID trick used by some no-steam clients).

Features

• Pending IDs are re-checked after csb_steamid_pending_timeout seconds instead of being judged instantly.
• Strict STEAM_x:y:z format check - exactly two colons, digits only after the prefix.
• Duplicate-SteamID detection across all connected humans.
• csb_steamid_allow_nosteam lets you run a no-steam-friendly server while still blocking duplicates and malformed IDs.
• Every rejection is logged with name, IP and the offending ID.

Installation

1. Compile csb_steamid_validator.sma and copy it to addons/amxmodx/plugins/.
2. Add it to plugins.ini and change the map.

On a legitimate no-steam server running Reunion or dproto, set csb_steamid_allow_nosteam 1 so real players with non-Steam IDs are not kicked, while duplicates are still blocked.