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Coraza v3.8.1 runs the Core Rule Set 4.25.0 (coraza-coreruleset v4.25.0) after the rule files, with the six changes and the default SWWAF_WAF_DISABLED_RULES that SPEC.md gives; no body, no response. SWWAF_WAF_MODE, SWWAF_WAF_PARANOIA_LEVEL, SWWAF_WAF_ANOMALY_THRESHOLD and SWWAF_WAF_EXEMPT_PATHS as specified; SWWAF_WAF_DISABLED_RULES refuses 900000 to 900999, smallwebwaf's own rules among them. A request with more query parameters than Coraza reads, 1000, adds 5 (rule 900300). In block mode a match is refused with 403, an offence counted toward the error burst; in detect mode it is let through. Both log waf_rule_ids, waf_score and duration_waf, raise waf_block, and count smallwebwaf_waf_matches_total. Judgement call: waf_block is raised in block mode too. Deviation: no engine-error path; with no body read, Coraza cannot fail. Model: opus-5-5
83 lines
2.4 KiB
Go
83 lines
2.4 KiB
Go
package proxy
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import (
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"time"
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"sneak.berlin/go/smallwebwaf/internal/alerts"
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"sneak.berlin/go/smallwebwaf/internal/config"
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"sneak.berlin/go/smallwebwaf/internal/requestlog"
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"sneak.berlin/go/smallwebwaf/internal/waf"
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)
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// checkCoreRuleSet inspects the request with the Core Rule Set, unless
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// SWWAF_WAF_MODE is off or SWWAF_WAF_EXEMPT_PATHS exempts its path, as
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// pathExempt decides, and notes the rules it matched and its score in the
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// log line, and the rules in the metrics. A score at or over
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// SWWAF_WAF_ANOMALY_THRESHOLD is a match: it raises the waf_block alert,
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// and in block mode refuses the request, which is an offence its client's
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// history counts, and so returns ActionWAFBlocked. It returns "" for a
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// request it does not refuse.
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func (rq *request) checkCoreRuleSet() string {
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cfg := rq.h.config
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if cfg.WAFMode == config.WAFModeOff || pathExempt(rq.in.URL, cfg.WAFExemptPaths) {
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return ""
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}
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start := time.Now()
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result := rq.h.coreRuleSet.Inspect(rq.in, rq.client)
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rq.line.DurationWAF = new(requestlog.Milliseconds(time.Since(start)))
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rq.line.WAFRuleIDs = result.RuleIDs
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rq.line.WAFScore = &result.Score
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for _, id := range result.RuleIDs {
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rq.h.metrics.WAFMatched(cfg.WAFMode, id)
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}
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threshold := cfg.WAFAnomalyThreshold
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if threshold == 0 || result.Score < threshold {
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return ""
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}
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rq.alertWAFBlock(result)
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if cfg.WAFMode == config.WAFModeDetect {
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return ""
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}
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rq.wafBlocked = true
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return requestlog.ActionWAFBlocked
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}
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// alertWAFBlock raises the waf_block alert for the request, which the Core
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// Rule Set scored at result, at or over SWWAF_WAF_ANOMALY_THRESHOLD. Its
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// detail gives the rule ids, the score, the method and the path with the
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// query, and, for a request that is not refused for it, the mode: detect,
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// or observe in observe mode.
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func (rq *request) alertWAFBlock(result waf.Result) {
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detail := map[string]any{
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"rule_ids": result.RuleIDs,
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"score": result.Score,
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"method": rq.in.Method,
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"path": rq.in.URL.RequestURI(),
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}
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switch {
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case rq.h.config.WAFMode == config.WAFModeDetect:
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detail["mode"] = config.WAFModeDetect
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case rq.h.config.Observe:
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detail["mode"] = "observe"
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}
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rq.h.alerts.Raise(alerts.Alert{
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Event: alerts.EventWAFBlock,
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Client: rq.client,
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Netblock: rq.h.clientGroup(rq.client),
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ASN: rq.line.ASN,
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ASName: rq.line.ASName,
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Country: rq.line.Country,
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Reason: "scored by the Core Rule Set at or over SWWAF_WAF_ANOMALY_THRESHOLD",
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Detail: detail,
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})
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}
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