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4be0b6e7fc
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Applies the setting renames of the naming audit under the SWW_WAF_ and SWW_RPROXY_ prefixes, with sneak's names for the IP reputation cache time and the two time limits, which now take milliseconds. The rproxy log field default_disposition becomes waf_backend_no_answer, and config.Config and config.FromEnvironment become config.WAF and config.WAFFromEnvironment. Go fields, test names and prose follow. No aliases; nothing reads the old names. Model: opus-5-5
112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
package waf
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// The heuristic core_rule_set. It reads SWW_WAF_CORE_RULE_SET_MODE,
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// SWW_WAF_CORE_RULE_SET_EXEMPT_PATHS and SWW_WAF_CORE_RULE_SET_SCORE_THRESHOLD.
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import (
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"context"
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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/coreruleset"
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"sneak.berlin/go/smallwebwaf/internal/requestlog"
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)
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// coreRuleSet inspects the request with the Core Rule Set, unless
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// SWW_WAF_CORE_RULE_SET_MODE is off or SWW_WAF_CORE_RULE_SET_EXEMPT_PATHS
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// exempts its path, as pathExempt decides, and notes the rules it matched and
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// its score in the log line, and the rules in the metrics. A score at or over
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// SWW_WAF_CORE_RULE_SET_SCORE_THRESHOLD is a match: it adds the tag
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// exploitsignature, raises the core_rule_set_match alert, and in block mode
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// refuses the request with 403, which is an offence its client's history
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// counts. Its figures are the score and the threshold.
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type coreRuleSet struct{}
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func (coreRuleSet) name() string { return "core_rule_set" }
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func (coreRuleSet) check(
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_ context.Context,
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rq *request,
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_ time.Time,
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) *verdict {
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cfg := rq.h.config
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if cfg.CoreRuleSetMode == config.CoreRuleSetModeOff ||
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pathExempt(rq.in, cfg.CoreRuleSetExemptPaths) {
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return nil
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}
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start := time.Now()
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// A question's body has been read into memory, so that reading it here
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// cannot fail.
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result, read, _ := rq.h.coreRuleSet.Inspect(rq.in, rq.client, rq.in.Body)
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rq.requestBytes = int64(len(read))
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rq.line.DurationCoreRuleSetMS = new(
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requestlog.Milliseconds(time.Since(start)),
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)
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rq.line.CoreRuleSetRuleIDs = result.RuleIDs
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rq.line.CoreRuleSetScore = &result.Score
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for _, id := range result.RuleIDs {
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rq.h.metrics.CoreRuleSetMatched(cfg.CoreRuleSetMode, id)
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}
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threshold := cfg.CoreRuleSetScoreThreshold
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if threshold == 0 || result.Score < threshold {
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return nil
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}
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rq.addTag(config.ExploitSignatureTag)
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rq.alertCoreRuleSetMatch(result)
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if cfg.CoreRuleSetMode == config.CoreRuleSetModeDetect {
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return nil
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}
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rq.blockedByCoreRuleSet = true
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return &verdict{
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action: requestlog.ActionBlockedByCoreRuleSet,
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figures: map[string]any{
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figureScore: result.Score,
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"threshold": threshold,
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},
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}
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}
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// alertCoreRuleSetMatch raises the core_rule_set_match alert for the request,
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// which the Core Rule Set scored at result, at or over
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// SWW_WAF_CORE_RULE_SET_SCORE_THRESHOLD. Its detail gives the rule ids, the
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// score, the method and the path with the query, and, for a request that is
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// not refused for it, the mode: detect, or observe in observe mode.
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func (rq *request) alertCoreRuleSetMatch(result coreruleset.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.CoreRuleSetMode == config.CoreRuleSetModeDetect:
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detail["mode"] = config.CoreRuleSetModeDetect
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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.EventCoreRuleSetMatch,
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Host: rq.site,
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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 " +
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"SWW_WAF_CORE_RULE_SET_SCORE_THRESHOLD",
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Detail: detail,
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})
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}
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