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BotServ BADWORDS: user-configurable regex kicker

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BADWORDS <#channel> ADD|DEL|LIST|CLEAR manages a channel's badword
patterns, each a regular expression, so a channel matches whatever it
wants — an improvement over Anope's fixed ANY/SINGLE/START/END. Enable
with KICK <#channel> BADWORDS ON.

Uses the regex crate: it's finite-automata based with linear-time
matching, so untrusted user patterns can't cause catastrophic
backtracking (ReDoS). A channel's patterns compile into one RegexSet
(single-pass match against all of them), cached in the engine and rebuilt
only when the list's revision changes — so the hot path is one is_match
call, no per-message compilation or allocation. Patterns are validated
(and size-limited) at add time; matching is case-insensitive by default.
This commit is contained in:
Jean Chevronnet 2026-07-13 16:16:44 +00:00
parent 43def8ee23
commit ca95184359
No known key found for this signature in database
9 changed files with 238 additions and 7 deletions
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14
api/src/lib.rs
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@ -414,6 +414,8 @@ pub enum Kicker {
Italics,
Flood,
Repeat,
// Kick lines matching a configured badword regex (patterns via BADWORDS).
Badwords,
// Exemption, not a rule: never kick channel operators.
DontKickOps,
}
@ -488,9 +490,10 @@ pub enum CertError {
#[derive(Debug)]
pub enum ChanError {
Exists, // channel already registered
NoChannel, // channel is not registered
Internal, // persistence failed
Exists, // channel already registered
NoChannel, // channel is not registered
InvalidPattern, // a badword regex didn't compile
Internal, // persistence failed
}
// What an emailed code authorises.
@ -553,6 +556,11 @@ pub trait Store {
fn set_caps_kicker(&mut self, channel: &str, caps_min: u16, caps_percent: u16) -> Result<(), ChanError>;
fn set_flood_kicker(&mut self, channel: &str, lines: u16, secs: u16) -> Result<(), ChanError>;
fn set_repeat_kicker(&mut self, channel: &str, times: u16) -> Result<(), ChanError>;
// BADWORDS list (regex patterns). add validates the pattern compiles.
fn badword_add(&mut self, channel: &str, pattern: &str) -> Result<bool, ChanError>;
fn badword_del(&mut self, channel: &str, pattern: &str) -> Result<bool, ChanError>;
fn badword_clear(&mut self, channel: &str) -> Result<usize, ChanError>;
fn badwords(&self, channel: &str) -> Vec<String>;
fn set_channel_topic(&mut self, channel: &str, topic: &str) -> Result<(), ChanError>;
fn suspend_channel(&mut self, channel: &str, by: &str, reason: &str, expires: Option<u64>) -> Result<(), ChanError>;
fn unsuspend_channel(&mut self, channel: &str) -> Result<bool, ChanError>;