605 lines
19 KiB
Go
605 lines
19 KiB
Go
package proxy_test
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import (
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"maps"
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"net/http"
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"net/netip"
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"slices"
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"testing"
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"time"
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"sneak.berlin/go/smallwebwaf/internal/alerts"
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"sneak.berlin/go/smallwebwaf/internal/proxy"
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"sneak.berlin/go/smallwebwaf/internal/reputation"
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"sneak.berlin/go/smallwebwaf/internal/requestlog"
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)
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// The reputation settings.
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const (
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blocklistURLs = "SWWAF_BLOCKLIST_URLS"
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blocklistAction = "SWWAF_BLOCKLIST_ACTION"
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asnLimitPercentURL = "SWWAF_ASN_LIMIT_PERCENT_URL"
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)
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// The actions of SWWAF_BLOCKLIST_ACTION and SWWAF_REPUTATION_ACTION:
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// limitHalf gives a listed client half of every limit, and limitQuarter a
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// quarter.
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const (
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actionDeny = "deny"
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actionLog = "log"
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limitHalf = "limit:50"
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limitQuarter = "limit:25"
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)
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// The lists these tests name, which are never fetched: each test puts in
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// the copies it needs, as reputation.json would at start.
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const (
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dropURL = "https://lists.example/drop.txt"
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torURL = "https://lists.example/tor.txt"
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asnURL = "https://lists.example/asn.txt"
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)
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func TestEachBlocklistActionForAListedAddressAndAListedNetblock(t *testing.T) {
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t.Parallel()
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forward, denied := requestlog.ActionForward, requestlog.ActionDenied
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for _, tc := range []struct {
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action string
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// statuses and actions are those of a listed client's three
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// requests, and percent their limit_percent, as percentText gives it.
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statuses []int
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actions []string
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percent string
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}{
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{
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actionDeny, []int{http.StatusForbidden, http.StatusForbidden, http.StatusForbidden},
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[]string{denied, denied, denied}, none,
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},
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{
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// Half of 4 requests a minute: the third breaks the limit.
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limitHalf, []int{http.StatusOK, http.StatusOK, http.StatusForbidden},
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[]string{forward, forward, requestlog.ActionRateLimited},
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"50 from " + blocklistAction,
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},
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{
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actionLog, []int{http.StatusOK, http.StatusOK, http.StatusOK},
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[]string{forward, forward, forward}, none,
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},
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} {
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t.Run(tc.action, func(t *testing.T) {
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t.Parallel()
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s, server, _ := startWithLookups(t, map[string]string{
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rateLimitPerMinute: fourAMinute, blocklistURLs: dropURL,
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blocklistAction: tc.action,
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})
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// fromDE is listed as an address, and fromKP in a netblock.
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loadLists(t, server, map[string][]string{
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dropURL: {"; DROP", fromDE, "198.51.100.0/24 ; SBL1"},
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})
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for _, from := range []string{fromDE, fromKP} {
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for i := range 3 {
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line := s.get(from, tc.statuses[i], tc.actions[i])
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wantReputation(t, line, dropURL)
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wantPercent(t, "limit_percent", line.LimitPercent,
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line.LimitPercentSetting, tc.percent)
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// A request refused for the list is not counted.
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counted := line.fields["counts"] != nil
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if counted != (tc.actions[i] != denied) {
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t.Errorf("request from %s counted %t, logged %s", from, counted,
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tc.actions[i])
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}
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}
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}
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// A client no list lists has the whole limit.
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for range 3 {
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line := s.get(unplaced, http.StatusOK, forward)
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wantReputation(t, line)
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wantPercent(t, "limit_percent", line.LimitPercent, line.LimitPercentSetting,
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none)
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}
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// A refusal for the list makes no ban.
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if held := server.Ledger.Snapshot(); tc.action == actionDeny && len(held) != 0 {
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t.Errorf("bans %+v, want none", held)
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}
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})
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}
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}
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func TestBlocklistsComeAfterTheCountryListsAndSkipAllowNets(t *testing.T) {
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t.Parallel()
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s, server, queue := startWithLookups(t, map[string]string{
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blocklistURLs: dropURL, deniedCountries: "kp", allowNets: fromDE,
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})
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loadLists(t, server, map[string][]string{dropURL: {fromDE, fromKP}})
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// fromKP's country refuses it before the list is looked at, and fromDE,
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// in SWWAF_ALLOW_NETS, is not checked at all: neither is noted, nor
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// alerted.
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wantReputation(t, s.get(fromKP, http.StatusForbidden, requestlog.ActionCountryDenied))
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wantReputation(t, s.get(fromDE, http.StatusOK, requestlog.ActionForward))
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wantAlerts(t, queue)
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}
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func TestObserveModeForwardsAClientABlocklistDeniesAndAlertsIt(t *testing.T) {
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t.Parallel()
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s, server, queue := startWithLookups(t, map[string]string{
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blocklistURLs: dropURL, mode: observe,
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})
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loadLists(t, server, map[string][]string{dropURL: {fromDE}})
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line := s.get(fromDE, http.StatusOK, requestlog.ActionForward)
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wantWouldAction(t, line, requestlog.ActionDenied)
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wantReputation(t, line, dropURL)
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waiting := queue.Snapshot().Waiting[alerts.DestinationWebhook]
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if len(waiting) != 1 || waiting[0].Event != alerts.EventReputationHit {
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t.Errorf("alerts waiting %+v, want a reputation_hit alert", waiting)
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}
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}
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func TestBlocklistLimitTakesPartInTheLowestPercentageOfEveryLimit(t *testing.T) {
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t.Parallel()
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for _, tc := range []struct {
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action, asnPercent string
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// want is the upload's limit_percent and bytes_percent, as
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// percentText gives them, and limitHit its limit_hit.
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want, limitHit string
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}{
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{limitHalf, asnDEQuarter, "25 from " + asnLimitPercent, minuteBytes},
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{limitQuarter, asnDEHalf, "25 from " + blocklistAction, minuteBytes},
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// The AS number's, the first of two alike.
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{limitQuarter, asnDEQuarter, "25 from " + asnLimitPercent, minuteBytes},
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{actionLog, asnDE + ":100", none, ""},
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} {
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t.Run(tc.action+" "+tc.asnPercent, func(t *testing.T) {
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t.Parallel()
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s, server, _ := startWithLookups(t, map[string]string{
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bytesLimitPerMinute: twoUploads, blocklistURLs: dropURL,
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blocklistAction: tc.action, asnLimitPercent: tc.asnPercent,
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})
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loadLists(t, server, map[string][]string{dropURL: {fromDE}})
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// The upload's 100 bytes are over 49, a quarter of 199, and 99,
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// half of it, and within 199.
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line := s.uploadFrom(fromDE)
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wantPercent(t, "limit_percent", line.LimitPercent, line.LimitPercentSetting,
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tc.want)
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wantPercent(t, "bytes_percent", line.BytesPercent, line.BytesPercentSetting,
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tc.want)
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if line.LimitHit != tc.limitHit {
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t.Errorf("log line has limit_hit %q, want %q", line.LimitHit, tc.limitHit)
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}
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})
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}
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}
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func TestASNLimitPercentFileCountsAsTheSettingDoesTheLowerWinning(t *testing.T) {
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t.Parallel()
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const (
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fromURL = "25 from " + asnLimitPercentURL
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fromSetting = "25 from " + asnLimitPercent
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)
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for _, tc := range []struct {
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name string
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env map[string]string
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file string
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// limitPercent and bytesPercent are the upload's, as percentText
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// gives them.
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limitPercent, bytesPercent string
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}{
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{"the file's alone", nil, asnDEQuarter, fromURL, fromURL},
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{
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"the file's, lower than the setting's",
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map[string]string{asnLimitPercent: asnDEHalf}, asnDEQuarter, fromURL, fromURL,
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},
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{
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"the setting's, lower than the file's",
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map[string]string{asnLimitPercent: asnDEQuarter}, asnDEHalf,
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fromSetting, fromSetting,
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},
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{
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"the setting's, the first of two alike",
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map[string]string{asnLimitPercent: asnDEQuarter}, asnDEQuarter,
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fromSetting, fromSetting,
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},
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{"none, for an AS number the file does not list", nil, asnKP + ":25", none, none},
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{
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"SWWAF_ASN_BYTES_PERCENT's in place of the file's for the byte limits",
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map[string]string{asnBytesPercent: asnDE + ":100"}, asnDEQuarter, fromURL, none,
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},
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} {
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t.Run(tc.name, func(t *testing.T) {
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t.Parallel()
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env := map[string]string{asnLimitPercentURL: asnURL}
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maps.Copy(env, tc.env)
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s, server, _ := startWithLookups(t, env)
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loadLists(t, server, map[string][]string{asnURL: {"# by AS number", tc.file}})
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line := s.uploadFrom(fromDE)
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wantPercent(t, "limit_percent", line.LimitPercent, line.LimitPercentSetting,
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tc.limitPercent)
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wantPercent(t, "bytes_percent", line.BytesPercent, line.BytesPercentSetting,
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tc.bytesPercent)
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})
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}
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}
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func TestEachBlocklistThatListsAClientRaisesAnAlertOncePerCooldownAndIsCounted(
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t *testing.T,
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) {
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t.Parallel()
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const emptyURL = "https://lists.example/empty.txt"
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s, clk, server, queue := startWithLookupsAndClock(t, map[string]string{
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blocklistURLs: dropURL + "," + torURL + "," + emptyURL,
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blocklistAction: actionLog,
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metricsToken: token,
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})
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loadLists(t, server, map[string][]string{dropURL: {fromDE}, torURL: {fromDE}})
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// The second request's alerts are repeats, which the cooldown holds
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// back.
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for range 2 {
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wantReputation(t, s.get(fromDE, http.StatusOK, requestlog.ActionForward),
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dropURL, torURL)
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}
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hit := func(source string) alerts.Alert {
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return alerts.Alert{
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Instance: alertInstance,
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Time: clk.Now(),
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Event: alerts.EventReputationHit,
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Client: netip.MustParseAddr(fromDE),
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Netblock: netip.MustParsePrefix(fromDE + "/32"),
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ASN: asnDE,
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ASName: asNameDE,
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Country: "DE",
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Reason: "listed by a blocklist",
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Detail: map[string]any{"source": source},
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}
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}
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wantAlerts(t, queue, hit(dropURL), hit(torURL))
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if queue.Suppressed() != 2 {
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t.Errorf("%d alerts held back, want the second request's 2", queue.Suppressed())
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}
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// Each list's hits, none of its fetches failed, and when its copy was
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// fetched, 0 for the one without.
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metrics := s.scrape(unplaced)
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fetched := float64(listsFetched().Unix())
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for listURL, want := range map[string]struct{ hits, fetched float64 }{
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dropURL: {2, fetched}, torURL: {2, fetched}, emptyURL: {0, 0},
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} {
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labels := `{instance="` + alertInstance + `",source="` + listURL + `"}`
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if want.hits == 0 {
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wantNoSeries(t, metrics, "smallwebwaf_reputation_hits_total"+labels)
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} else {
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wantMetric(t, metrics, "smallwebwaf_reputation_hits_total"+labels, want.hits)
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}
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wantMetric(t, metrics, "smallwebwaf_reputation_failures_total"+labels, 0)
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wantMetric(t, metrics, "smallwebwaf_reputation_last_fetch_timestamp_seconds"+labels,
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want.fetched)
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}
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}
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// The DNSBL settings.
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const (
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dnsblZones = "SWWAF_DNSBL_ZONES"
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dnsblResolver = "SWWAF_DNSBL_RESOLVER"
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reputationAction = "SWWAF_REPUTATION_ACTION"
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)
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// The DNSBL zones these tests name, which are never asked about the
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// clients the tests send requests from: each test puts in the verdicts it
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// needs, as reputation.json would at start. A query a test does start is
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// sent to noResolver, where nothing listens, so that none leaves the host.
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const (
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dnsblZone = "dnsbl.example"
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otherZone = "other.example"
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noResolver = "127.0.0.1:9"
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)
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func TestEachReputationActionForAClientADNSBLZoneLists(t *testing.T) {
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t.Parallel()
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forward, denied := requestlog.ActionForward, requestlog.ActionDenied
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for _, tc := range []struct {
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action string
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// statuses and actions are those of a listed client's three
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// requests, and percent their limit_percent, as percentText gives it.
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statuses []int
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actions []string
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percent string
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}{
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{
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actionDeny, []int{http.StatusForbidden, http.StatusForbidden, http.StatusForbidden},
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[]string{denied, denied, denied}, none,
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},
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{
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// Half of 4 requests a minute: the third breaks the limit.
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limitHalf, []int{http.StatusOK, http.StatusOK, http.StatusForbidden},
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[]string{forward, forward, requestlog.ActionRateLimited},
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"50 from " + reputationAction,
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},
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{
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actionLog, []int{http.StatusOK, http.StatusOK, http.StatusOK},
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[]string{forward, forward, forward}, none,
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},
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} {
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t.Run(tc.action, func(t *testing.T) {
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t.Parallel()
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s, server, _ := startWithLookups(t, map[string]string{
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rateLimitPerMinute: fourAMinute, dnsblZones: dnsblZone + "," + otherZone,
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dnsblResolver: noResolver, reputationAction: tc.action,
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})
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listedBy := map[string][]string{
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fromDE: {dnsblZone, otherZone}, fromKP: {otherZone}, unplaced: nil,
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}
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loadVerdicts(server, listedBy)
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for _, from := range []string{fromDE, fromKP} {
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for i := range 3 {
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line := s.get(from, tc.statuses[i], tc.actions[i])
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// In the order SWWAF_DNSBL_ZONES names them.
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wantReputation(t, line, listedBy[from]...)
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wantPercent(t, "limit_percent", line.LimitPercent,
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line.LimitPercentSetting, tc.percent)
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// A request refused for the verdict is not counted.
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counted := line.fields["counts"] != nil
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if counted != (tc.actions[i] != denied) {
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t.Errorf("request from %s counted %t, logged %s", from, counted,
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tc.actions[i])
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}
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}
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}
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// A client no zone lists has the whole limit.
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for range 3 {
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line := s.get(unplaced, http.StatusOK, forward)
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wantReputation(t, line)
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wantPercent(t, "limit_percent", line.LimitPercent, line.LimitPercentSetting,
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none)
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}
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// A refusal for the verdict makes no ban, and every client had its
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// verdicts, so no zone was asked.
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if held := server.Ledger.Snapshot(); tc.action == actionDeny && len(held) != 0 {
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t.Errorf("bans %+v, want none", held)
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}
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if queries := server.DNSBL.Queries(dnsblZone); queries != 0 {
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t.Errorf("%d queries, want none", queries)
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}
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})
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}
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}
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func TestDNSBLZonesComeAfterTheBlocklistsAndSkipAllowNets(t *testing.T) {
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t.Parallel()
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s, server, queue := startWithLookups(t, map[string]string{
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blocklistURLs: dropURL, dnsblZones: dnsblZone, dnsblResolver: noResolver,
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reputationAction: actionDeny, allowNets: fromDE,
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})
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loadLists(t, server, map[string][]string{dropURL: {fromKP}})
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loadVerdicts(server, map[string][]string{fromKP: {dnsblZone}, fromDE: {dnsblZone}})
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// The blocklist refuses fromKP before its verdict is looked at, and
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// fromDE, in SWWAF_ALLOW_NETS, is not checked at all: neither is noted
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// for the zone, nor alerted, nor asked about.
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wantReputation(t, s.get(fromKP, http.StatusForbidden, requestlog.ActionDenied),
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dropURL)
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wantReputation(t, s.get(fromDE, http.StatusOK, requestlog.ActionForward))
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waiting := queue.Snapshot().Waiting[alerts.DestinationWebhook]
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if len(waiting) != 1 || waiting[0].Detail["source"] != dropURL {
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t.Errorf("alerts waiting %+v, want the blocklist's reputation_hit alone", waiting)
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}
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if queries := server.DNSBL.Queries(dnsblZone); queries != 0 {
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t.Errorf("%d queries, want none", queries)
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}
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}
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func TestReputationLimitTakesPartInTheLowestPercentageOfEveryLimit(t *testing.T) {
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t.Parallel()
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for _, tc := range []struct {
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blocklistAction, reputationAction string
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// want is the request's limit_percent and bytes_percent, as
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// percentText gives them.
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want string
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}{
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{limitHalf, limitQuarter, "25 from " + reputationAction},
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{limitQuarter, limitHalf, "25 from " + blocklistAction},
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// The blocklist's, the first of two alike.
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{limitQuarter, limitQuarter, "25 from " + blocklistAction},
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{actionLog, limitQuarter, "25 from " + reputationAction},
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{actionLog, actionLog, none},
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} {
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t.Run(tc.blocklistAction+" "+tc.reputationAction, func(t *testing.T) {
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t.Parallel()
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s, server, _ := startWithLookups(t, map[string]string{
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blocklistURLs: dropURL, blocklistAction: tc.blocklistAction,
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dnsblZones: dnsblZone, dnsblResolver: noResolver,
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reputationAction: tc.reputationAction,
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})
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loadLists(t, server, map[string][]string{dropURL: {fromDE}})
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loadVerdicts(server, map[string][]string{fromDE: {dnsblZone}})
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// Named by the blocklist, then by the zone.
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line := s.get(fromDE, http.StatusOK, requestlog.ActionForward)
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wantReputation(t, line, dropURL, dnsblZone)
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wantPercent(t, "limit_percent", line.LimitPercent, line.LimitPercentSetting,
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tc.want)
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wantPercent(t, "bytes_percent", line.BytesPercent, line.BytesPercentSetting,
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tc.want)
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})
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}
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}
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func TestEachZoneThatListsAClientRaisesAnAlertOncePerCooldownAndIsCounted(
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t *testing.T,
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) {
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t.Parallel()
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s, clk, server, queue := startWithLookupsAndClock(t, map[string]string{
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dnsblZones: dnsblZone + "," + otherZone, dnsblResolver: noResolver,
|
|
reputationAction: actionLog, metricsToken: token,
|
|
})
|
|
loadVerdicts(server, map[string][]string{
|
|
fromDE: {dnsblZone, otherZone}, unplaced: nil,
|
|
})
|
|
|
|
// The second request's alerts are repeats, which the cooldown holds
|
|
// back.
|
|
for range 2 {
|
|
wantReputation(t, s.get(fromDE, http.StatusOK, requestlog.ActionForward),
|
|
dnsblZone, otherZone)
|
|
}
|
|
|
|
hit := func(zone string) alerts.Alert {
|
|
return alerts.Alert{
|
|
Instance: alertInstance,
|
|
Time: clk.Now(),
|
|
Event: alerts.EventReputationHit,
|
|
Client: netip.MustParseAddr(fromDE),
|
|
Netblock: netip.MustParsePrefix(fromDE + "/32"),
|
|
ASN: asnDE,
|
|
ASName: asNameDE,
|
|
Country: "DE",
|
|
Reason: "listed by a DNSBL zone",
|
|
Detail: map[string]any{"source": zone},
|
|
}
|
|
}
|
|
wantAlerts(t, queue, hit(dnsblZone), hit(otherZone))
|
|
|
|
if queue.Suppressed() != 2 {
|
|
t.Errorf("%d alerts held back, want the second request's 2", queue.Suppressed())
|
|
}
|
|
|
|
// Each zone's hits, and its queries and their failures, none, since
|
|
// every client had its verdicts.
|
|
metrics := s.scrape(unplaced)
|
|
|
|
for _, zone := range []string{dnsblZone, otherZone} {
|
|
labels := `{instance="` + alertInstance + `",source="` + zone + `"}`
|
|
|
|
wantMetric(t, metrics, "smallwebwaf_reputation_hits_total"+labels, 2)
|
|
wantMetric(t, metrics, "smallwebwaf_reputation_queries_total"+labels, 0)
|
|
wantMetric(t, metrics, "smallwebwaf_reputation_failures_total"+labels, 0)
|
|
}
|
|
}
|
|
|
|
func TestRequestFromAClientWithoutAVerdictHasTheZoneAskedAboutIt(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
s, server, _ := startWithLookups(t, map[string]string{
|
|
dnsblZones: dnsblZone + "," + otherZone, dnsblResolver: noResolver,
|
|
})
|
|
server.DNSBL.Load([]reputation.Verdict{{
|
|
Zone: otherZone, Client: netip.MustParseAddr(fromDE), Listed: true,
|
|
Fetched: verdictsFetched(),
|
|
}})
|
|
|
|
// The verdict of the other zone is used, and dnsbl.example, which has
|
|
// none, is asked about the client in the background, once: the second
|
|
// request finds the query under way, or the zone left alone after it
|
|
// failed, since nothing answers at noResolver.
|
|
for range 2 {
|
|
wantReputation(t, s.get(fromDE, http.StatusOK, requestlog.ActionForward), otherZone)
|
|
}
|
|
|
|
if queries := server.DNSBL.Queries(dnsblZone); queries != 1 {
|
|
t.Errorf("%d queries to %s, want 1", queries, dnsblZone)
|
|
}
|
|
|
|
if queries := server.DNSBL.Queries(otherZone); queries != 0 {
|
|
t.Errorf("%d queries to %s, want none", queries, otherZone)
|
|
}
|
|
}
|
|
|
|
// listsFetched is when loadLists has the copies fetched.
|
|
func listsFetched() time.Time {
|
|
return time.Date(2026, 10, 5, 0, 0, 0, 0, time.UTC)
|
|
}
|
|
|
|
// verdictsFetched is when loadVerdicts has the verdicts fetched: half a
|
|
// day before the time the tests' clock is set to, so that they are in use
|
|
// until half a day later.
|
|
func verdictsFetched() time.Time {
|
|
return time.Date(2026, 10, 5, 12, 0, 0, 0, time.UTC)
|
|
}
|
|
|
|
// loadVerdicts puts into server's DNSBL, for each client listedBy names,
|
|
// a verdict of each zone SWWAF_DNSBL_ZONES names, fetched at
|
|
// verdictsFetched, as reputation.json would at start: one that lists the
|
|
// client from each zone listedBy gives for it, and one that does not from
|
|
// each other zone.
|
|
func loadVerdicts(server *proxy.Server, listedBy map[string][]string) {
|
|
verdicts := make([]reputation.Verdict, 0, len(listedBy)*len(server.DNSBL.Zones()))
|
|
|
|
for client, zones := range listedBy {
|
|
for _, zone := range server.DNSBL.Zones() {
|
|
verdicts = append(verdicts, reputation.Verdict{
|
|
Zone: zone, Client: netip.MustParseAddr(client),
|
|
Listed: slices.Contains(zones, zone), Fetched: verdictsFetched(),
|
|
})
|
|
}
|
|
}
|
|
|
|
server.DNSBL.Load(verdicts)
|
|
}
|
|
|
|
// loadLists puts copies of lists into server's lists, by URL, each with
|
|
// its lines, fetched at listsFetched, as reputation.json would at start.
|
|
func loadLists(t *testing.T, server *proxy.Server, copies map[string][]string) {
|
|
t.Helper()
|
|
|
|
lists := make([]reputation.List, 0, len(copies))
|
|
for listURL, lines := range copies {
|
|
lists = append(lists, reputation.List{
|
|
URL: listURL, Fetched: listsFetched(), Lines: lines,
|
|
})
|
|
}
|
|
|
|
err := server.Lists.Load(lists)
|
|
if err != nil {
|
|
t.Fatalf("load the lists: %v", err)
|
|
}
|
|
}
|
|
|
|
// wantReputation checks the URLs of the blocklists the log line names in
|
|
// its reputation.
|
|
func wantReputation(t *testing.T, line logLine, want ...string) {
|
|
t.Helper()
|
|
|
|
if !slices.Equal(line.Reputation, want) {
|
|
t.Errorf("log line has reputation %v, want %v", line.Reputation, want)
|
|
}
|
|
}
|