sneak
7f8a59de04
check / check (push) Waiting to run
script/fmt now runs golines -m 77 after gofmt, repeating golines until it changes nothing, since one pass can leave a line the next splits. script/fmt-check fails when either would change a file. script/bootstrap installs golines v0.13.0 with go install, pinned to its commit, and checks the installed version with go version -m. The tree is reformatted. The longer lines this makes are fixed by hand: nolint directives moved onto their own line above the statement, one string split, and 20 functions over funlen's 80 lines shortened or split, RunWAF and limitPercentages among them. Model: opus-5-5
61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
package waf
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// The heuristic refusal_limit. It reads SWW_ERROR_BURST_THRESHOLD and
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// SWW_BAN_RESPONSE.
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import (
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"context"
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"net/http"
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"time"
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"sneak.berlin/go/smallwebwaf/internal/requestlog"
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)
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// refusalLimit counts the request once it has been answered, if waf
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// refused it after a rule file match, a trap path or a Core Rule Set match, and
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// in observe mode if enforce mode would have: more than
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// SWW_ERROR_BURST_THRESHOLD such refusals of the client within a minute break
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// a limit, which bans the client. A client in SWW_ALLOW_NETS, which the
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// heuristics skip, is not counted, and nothing is while the threshold is off.
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// Its figures are the window, the count and the limit.
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type refusalLimit struct{}
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func (refusalLimit) name() string { return "refusal_limit" }
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func (refusalLimit) check(
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_ context.Context,
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rq *request,
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now time.Time,
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) *verdict {
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cfg := rq.h.config
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if cfg.ErrorBurstThreshold == 0 {
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return nil
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}
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if !rq.attack && !rq.blockedByBlockRule && !rq.blockedByCoreRuleSet {
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return nil
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}
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hit, over := rq.h.limiter.CountRefusal(rq.h.clientGroup(rq.client), now,
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cfg.ErrorBurstThreshold)
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if !over {
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return nil
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}
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// What the client was sent, or in observe mode would have been.
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status := rq.out.status
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switch rq.line.WouldAction {
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case requestlog.ActionBlockedByBlockRule,
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requestlog.ActionBlockedByCoreRuleSet:
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status = http.StatusForbidden
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case requestlog.ActionTemporarilyBanned,
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requestlog.ActionPermanentlyBanned:
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status = cfg.BanResponse
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}
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rq.banForLimit(now, hit, status)
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return &verdict{figures: limitFigures(hit)}
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}
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