SWW_APPS: an app's Core Rule Set fixes apply only to the hostnames that serve it (closes #220)

Each app's fixes are one .conf file and one entry in apps. They apply
only while Inspect has set the app's transaction variable, such as
tx.app_gitea. SWW_APPS names each hostname's apps. A hostname gets only
its apps' fixes; while SWW_APPS is unset, every hostname gets every
app's fixes.

A hostname in SWW_APPS that is not a DNS name, such as *.example.com,
stops the start. Unset, SWW_APPS is logged at start as null; set
empty, as "".

Model: opus-5-5

internal/coreruleset/recorded_test.go

@@ -13,6 +13,8 @@ import (
 	"slices"
 	"strings"
 	"testing"
+
+	"sneak.berlin/go/smallwebwaf/internal/coreruleset"
 )
 
 // giteaRequests returns the recorded ordinary gitea requests in testdata.
@@ -52,10 +54,10 @@ func TestOrdinaryGiteaRequestsPass(t *testing.T) {
 
 	const threshold = 5 // SWW_WAF_ANOMALY_THRESHOLD's default
 
-	crs := atDefaults(t)
+	crs := servingApps(t, map[string][]string{giteaHost: {gitea}})
 
 	for _, r := range giteaRequests(t) {
-		if got := inspect(t, crs, r); got.Score >= threshold {
+		if got := inspect(t, crs, withHost(r, giteaHost)); got.Score >= threshold {
 			t.Errorf("%s %q refused: %+v", r.target, r.headers[1:], got)
 		}
 	}
@@ -102,17 +104,25 @@ func recordedRequests(t *testing.T, name string) []recordedRequest {
 }
 
 // wantRecordedRequestsPass checks that none of the recorded ordinary
-// requests in the file name in testdata is refused, at the defaults and
-// while bodies are read. A request with neither a body nor a Content-Type
-// header is checked only at the defaults: with neither, the set that reads
-// bodies has nothing more to check. Each request runs as its own parallel
-// subtest.
-func wantRecordedRequestsPass(t *testing.T, name string) {
+// requests in the file name in testdata is refused on the hostname where
+// they were recorded, otherHost for WordPress and example.com for the other
+// apps, while SWW_APPS lists only app for it. They are checked at the
+// defaults and while bodies are read. With SWW_APPS unset, every app's fixes
+// apply. These only switch checks off, so the requests pass then too. A
+// request with neither a body nor a Content-Type header is checked only at
+// the defaults: with neither, the set that reads bodies has nothing more to
+// check. Each request runs as its own parallel subtest.
+func wantRecordedRequestsPass(t *testing.T, name, app string) {
 	t.Helper()
 
 	const threshold = 5 // SWW_WAF_ANOMALY_THRESHOLD's default
 
-	defaults, bodies := atDefaults(t), readingBodies(t)
+	apps := map[string][]string{"example.com": {app}, otherHost: {app}}
+	defaults := servingApps(t, apps)
+	bodies := shared(t, coreruleset.Params{
+		ParanoiaLevel: 1, DisabledRules: defaultDisabledRules, BodyLimit: bodyLimit,
+		Apps: apps,
+	})
 
 	for _, recorded := range recordedRequests(t, name) {
 		t.Run(recorded.Method+" "+recorded.Target, func(t *testing.T) {
@@ -146,35 +156,35 @@ func wantRecordedRequestsPass(t *testing.T, name string) {
 func TestOrdinaryDrupalRequestsPass(t *testing.T) {
 	t.Parallel()
 
-	wantRecordedRequestsPass(t, "drupal-requests.txt")
+	wantRecordedRequestsPass(t, "drupal-requests.txt", "drupal")
 }
 
 func TestOrdinaryMastodonRequestsPass(t *testing.T) {
 	t.Parallel()
 
-	wantRecordedRequestsPass(t, "mastodon-requests.txt")
+	wantRecordedRequestsPass(t, "mastodon-requests.txt", "mastodon")
 }
 
 func TestOrdinaryMediaWikiRequestsPass(t *testing.T) {
 	t.Parallel()
 
-	wantRecordedRequestsPass(t, "mediawiki-requests.txt")
+	wantRecordedRequestsPass(t, "mediawiki-requests.txt", mediawiki)
 }
 
 func TestOrdinaryNextcloudRequestsPass(t *testing.T) {
 	t.Parallel()
 
-	wantRecordedRequestsPass(t, "nextcloud-requests.txt")
+	wantRecordedRequestsPass(t, "nextcloud-requests.txt", nextcloud)
 }
 
 func TestOrdinaryVaultwardenRequestsPass(t *testing.T) {
 	t.Parallel()
 
-	wantRecordedRequestsPass(t, "vaultwarden-requests.txt")
+	wantRecordedRequestsPass(t, "vaultwarden-requests.txt", "vaultwarden")
 }
 
 func TestOrdinaryWordPressRequestsPass(t *testing.T) {
 	t.Parallel()
 
-	wantRecordedRequestsPass(t, "wordpress-requests.txt")
+	wantRecordedRequestsPass(t, "wordpress-requests.txt", wordpress)
 }