SWWAF_ALERT_WEBHOOK_URL gets one JSON POST per alert, in SPEC.md's
schema, with SWWAF_ALERT_WEBHOOK_HEADERS: ban and permanent_ban, with
the ban's notes, in observe mode too, marked mode observe;
source_failure for GeoJS; file_error for a rule or state file with an
error. SWWAF_ALERT_EVENTS chooses; SWWAF_ALERT_COOLDOWN holds back
repeats by netblock, file or source; past SWWAF_ALERT_MAX_PER_HOUR the
hour ends in one summary. A bounded queue, retried with backoff, holds
up no request; a 4xx other than 408 and 429 gives the alert up.
alerts.json keeps the queue, the cooldowns and the hour. Nothing shows
the URL's path or query.
Judgement call: the summary's event is summary, which SPEC.md omits.
Judgement call: an admin's ban raises no alert.
Model: opus-5-5
Every *.rules file in SWWAF_RULES_DIR not named with a leading dot is
read at start, and again 2 seconds after the directory's last change.
Each request is checked against the rules after the rate limits: log
notes a match, block refuses with 403, ban refuses and bans the netblock
for SWWAF_ATTACK_BAN_DURATION, made permanent by its next request or
attack. path, query and uri are matched as the request line sent them;
header:Host and header:Transfer-Encoding are refused. Bans gain a cause.
The image ships 00-default.rules.
Judgement call: a header sent twice is matched with its values joined
by ", ".
Judgement call: SWWAF_MAX_BAN_DURATION does not cap a ban for an attack.
Not in this unit: offences for rule matches, with the error burst.
Model: opus-5-5
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