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SWWAF_ASN_LIMIT_PERCENT and SWWAF_COUNTRY_LIMIT_PERCENT give the clients of the AS numbers and countries they list that percentage of every rate and byte limit, rounded down; SWWAF_ASN_BYTES_PERCENT and SWWAF_COUNTRY_BYTES_PERCENT take its place for the byte limits of those they list; SWWAF_UNKNOWN_LIMIT_PERCENT (100) covers clients without a country. The lowest applies. While one lowers a limit, a request waits for its client's lookup, and SWWAF_LOOKUP_SOURCE=off stops the start. Log lines give limit_percent and bytes_percent with their settings; ban notes, and so alerts, give the broken limit's. Judgement call: a client without a country is unknown, whatever its AS number. Judgement call: bytes_percent and its setting are log fields SPEC does not name. Rule suppressed: funlen on FromEnvironment, one line per setting. Model: opus-5-5
72 lines
2.4 KiB
Go
72 lines
2.4 KiB
Go
package proxy
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import (
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"context"
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"net/http"
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"net/netip"
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"sneak.berlin/go/smallwebwaf/internal/lookup"
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)
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// The headers in which the app is passed the client's AS number and
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// country while SWWAF_ADD_LOOKUP_HEADERS is set. Go writes every header
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// name in this form, as it sends it and as it receives it, so X-Client-ASN
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// arrives as X-Client-Asn, and Del removes a client's own whatever their
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// case; header names are not case-sensitive.
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const (
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asnHeader = "X-Client-Asn"
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countryHeader = "X-Client-Country"
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)
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// lookUp looks up the client's AS number and country, in the lookup
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// database or through GeoJS, and notes them for the log line, unless
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// SWWAF_LOOKUP_SOURCE is off or the client is on a private, loopback or
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// link-local address, which no lookup can place. The lookup database
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// answers at once. With GeoJS, while a setting needs the answer, such as a
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// country list or a biased threshold, a new client's request waits for it.
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// ctx is the request's own context.
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func (rq *request) lookUp(ctx context.Context) {
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if rq.h.config.LookupSource == "off" || !canBePlaced(rq.client) {
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return
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}
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if rq.h.config.LookupSource == "file" {
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rq.lookupAnswer = rq.h.lookupFile.LookUp(clientGroup(rq.client))
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} else {
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rq.lookupAnswer = rq.h.geojs.LookUp(ctx, clientGroup(rq.client))
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}
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rq.lookedUp = true
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rq.line.ASN = rq.lookupAnswer.ASN
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rq.line.ASName = rq.lookupAnswer.ASName
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rq.line.Country = rq.lookupAnswer.Country
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}
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// addLookup adds answer, an answer about a client from the lookup
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// database or GeoJS, to the client's history, and to the notes of the bans
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// on its netblock that have no AS number, AS name or country yet.
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func (h *handler) addLookup(answer lookup.Answer) {
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h.limiter.AddLookup(answer.Client, answer.Answered,
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answer.ASN, answer.ASName, answer.Country)
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h.ledger.AddLookup(h.netblock(answer.Client.Addr()),
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answer.ASN, answer.ASName, answer.Country)
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}
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// setLookupHeaders sets the headers in which the app is passed the
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// client's AS number and country, leaving out one that is unknown.
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func setLookupHeaders(header http.Header, asn, country string) {
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if asn != "" {
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header.Set(asnHeader, asn)
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}
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if country != "" {
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header.Set(countryHeader, country)
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}
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}
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// canBePlaced reports whether a lookup can place addr: private, loopback
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// and link-local addresses have no AS number or country.
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func canBePlaced(addr netip.Addr) bool {
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return !addr.IsPrivate() && !addr.IsLoopback() && !addr.IsLinkLocalUnicast()
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}
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