sneak
ca9e97998f
check / check (push) Waiting to run
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 request that makes a ban permanent gets permanently_banned. A ban the request itself makes gets the value for that ban, 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
68 lines
2.3 KiB
Go
68 lines
2.3 KiB
Go
package discriminator
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// The heuristic rate_limits. It reads SWW_RATE_LIMIT_EXEMPT_NETS,
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// SWW_RATE_LIMIT_EXEMPT_PATHS and SWW_BAN_RESPONSE, and the rate limits and
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// biased thresholds through the limiter and limitPercentages.
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import (
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"context"
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"time"
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"sneak.berlin/go/smallwebwaf/internal/requestlog"
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)
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// rateLimits counts the request for the rate limits, unless
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// countedByRateLimits exempts it, by the client's limit percentages, which it
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// notes for the log line with the client's counts. A request that takes the
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// client over a rate limit, as its limit percentage lowers it, breaks it: it is
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// refused, and bans the client. A request exempt from the rate limits is exempt
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// from the byte limits too. Its figures are the window, the count and the
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// limit.
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type rateLimits struct{}
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func (rateLimits) name() string { return "rate_limits" }
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func (rateLimits) check(_ context.Context, rq *request, now time.Time) *verdict {
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rq.counted = rq.countedByRateLimits()
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if !rq.counted {
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return nil
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}
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rq.limitPercent, rq.bytesPercent = rq.limitPercentages()
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rq.line.LimitPercent, rq.line.LimitPercentSetting = rq.limitPercent.logged()
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rq.line.BytesPercent, rq.line.BytesPercentSetting = rq.bytesPercent.logged()
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counts, hit, over := rq.h.limiter.Count(rq.h.clientGroup(rq.client), now,
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rq.limitPercent.percent)
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rq.line.Counts = counts
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if !over {
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return nil
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}
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rq.banForLimit(now, hit, rq.h.config.BanResponse)
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return &verdict{
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action: requestlog.ActionClientIsRateLimited, figures: limitFigures(hit),
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}
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}
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// overAWholeRateLimit reports whether the heuristic rate_limits will refuse the
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// request at now, whatever its client's limit percentages: the rate limits
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// count it, and one more request from its client takes it over a whole rate
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// limit. It counts nothing.
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func (rq *request) overAWholeRateLimit(now time.Time) bool {
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return rq.countedByRateLimits() &&
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rq.h.limiter.OverARateLimit(rq.h.clientGroup(rq.client), now)
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}
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// countedByRateLimits reports whether the rate limits count the request: its
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// client is not in SWW_RATE_LIMIT_EXEMPT_NETS, and its path is not exempt
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// under SWW_RATE_LIMIT_EXEMPT_PATHS.
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func (rq *request) countedByRateLimits() bool {
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cfg := rq.h.config
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return !isInside(rq.client, cfg.RateLimitExemptNets) &&
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!pathExempt(rq.in, cfg.RateLimitExemptPaths)
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}
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