sneak
d8fefb1288
check / check (push) In progress
Rename too_large, rate_limited, rule_blocked and denied, and split banned into temporarily_banned and permanently_banned by whether the ban runs out. A client under both a temporary and a permanent ban gets the permanent one. A request that makes a ban permanent gets permanently_banned. A ban rule, a trap path or a CrowdSec decision gets the value for the ban it makes, and in observe mode would_action names the ban enforce mode would have made. The offence kind rule_blocked follows, as a metric label and a key in clients.json. Model: opus-5-5
55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
package discriminator
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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 discriminator
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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(_ context.Context, rq *request, now time.Time) *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.wafBlocked {
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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, requestlog.ActionWAFBlocked:
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status = http.StatusForbidden
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case requestlog.ActionTemporarilyBanned, 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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