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SWWAF_LOOKUP_SOURCE=file looks every client up in the file SWWAF_LOOKUP_DB_PATH names, without GeoJS. file without the path, the path with another source, or a file that cannot be read stops the start. The file is read whole into memory, so overwriting it in place cannot disturb a lookup, and read again 2 seconds after its last change; a replacement that cannot be read is logged, counted and sent as a file_error alert, and the old one stays in use. Metrics give when it was read and the failed reads. Tests write their databases through internal/lookup/lookuptest. Deviation: go.mod and go.sum written by hand; go runs only through make. Judgement call: the 2-second wait, as the rule files have. Model: opus-5-5
71 lines
2.4 KiB
Go
71 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, a new
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// client's request waits for it. 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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