Merge branch 'main' into prepare-caddy-embedding-core

Signed-off-by: Jason Cameron <git@jasoncameron.dev>

.github/actions/spelling/allow.txt

@@ -39,3 +39,5 @@ wenet
 qwertiko
 setuplistener
 mba
+xfu
+xou

.github/actions/spelling/expect.txt

@@ -120,6 +120,7 @@ fahedouch
 fastcgi
 FCr
 fcrdns
+fcvg
 fediverse
 ffprobe
 fhdr
@@ -238,6 +239,7 @@ mnt
 Mojeek
 mojeekbot
 mozilla
+mqvh
 myclient
 mymaster
 mypass
@@ -387,6 +389,7 @@ vnd
 VPS
 Vultr
 WAIFU
+wcg
 weblate
 webmaster
 webpage

.github/workflows/smoke-tests.yml

@@ -27,6 +27,7 @@ jobs:
           - palemoon/amd64
           #- palemoon/i386
           - robots_txt
+          - traefik
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code

cmd/anubis/main.go

@@ -259,7 +259,7 @@ func main() {
 	}
 
 	lg.Info("loading policy file", "fname", *policyFname)
-	policy, err := libanubis.LoadPoliciesOrDefault(ctx, *policyFname, *challengeDifficulty, *slogLevel)
+	policy, err := libanubis.LoadPoliciesOrDefault(ctx, *policyFname, *challengeDifficulty, *slogLevel, strings.TrimSpace(*target) == "")
 	if err != nil {
 		log.Fatalf("can't parse policy file: %v", err)
 	}

docs/docs/CHANGELOG.md

@@ -13,19 +13,24 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- This changes the project to: -->
 
-- Move metrics server configuration to [the policy file](./admin/policies.mdx#metrics-server).
+- Patch [GHSA-6wcg-mqvh-fcvg](https://github.com/TecharoHQ/anubis/security/advisories/GHSA-6wcg-mqvh-fcvg) by containing subrequest logic to Anubis instances in subrequest mode
+- Implement robot9001 style delays on the honeypot feature so that the first hit takes 1 millisecond, the second takes 2, etc
+- Move metrics server configuration to [the policy file](./admin/policies.mdx#metrics-server)
 - Expose [pprof endpoints](https://pkg.go.dev/net/http/pprof) on the metrics listener to enable profiling Anubis in production.
 - fix: prevent nil pointer panic in challenge validation when threshold rules match during PassChallenge (#1463)
-- Instruct reverse proxies to not cache error pages.
+- Instruct reverse proxies to not cache error pages
 - Fixed mixed tab/space indentation in Caddy documentation code block
 - Improve error messages and fix broken REDIRECT_DOMAINS link in docs ([#1193](https://github.com/TecharoHQ/anubis/issues/1193))
 - Add Bulgarian locale ([#1394](https://github.com/TecharoHQ/anubis/pull/1394))
 - Fixed case-sensitivity mismatch in geoipchecker.go
-- Fix CEL internal errors when iterating `headers`/`query` map wrappers by implementing map iterators for `HTTPHeaders` and `URLValues` ([#1465](https://github.com/TecharoHQ/anubis/pull/1465)).
-- Enable [metrics serving via TLS](./admin/policies.mdx#tls), including [mutual TLS (mTLS)](./admin/policies.mdx#mtls).
-- Enable [HTTP basic auth](./admin/policies.mdx#http-basic-authentication) for the metrics server.
-- Fix a bug in the dataset poisoning maze that could allow denial of service [#1580](https://github.com/TecharoHQ/anubis/issues/1580).
-- Add config option to add ASN to logs/metrics.
+- Fix CEL internal errors when iterating `headers`/`query` map wrappers by implementing map iterators for `HTTPHeaders` and `URLValues` ([#1465](https://github.com/TecharoHQ/anubis/pull/1465))
+- Enable [metrics serving via TLS](./admin/policies.mdx#tls), including [mutual TLS (mTLS)](./admin/policies.mdx#mtls)
+- Enable [HTTP basic auth](./admin/policies.mdx#http-basic-authentication) for the metrics server
+- Fix a bug in the dataset poisoning maze that could allow denial of service [#1580](https://github.com/TecharoHQ/anubis/issues/1580)
+- Add config option to add ASN to logs/metrics
+- Log weight when issuing challenge
+- Keep Anubis server URL state local to each `lib.Server` instance to make embedded use safer
+- Fix `path_regex` and CEL `path` rules not matching when using Traefik `forwardAuth` middleware. Anubis now checks `X-Forwarded-Uri` (Traefik) in addition to `X-Original-URI` (nginx) when resolving the request path in subrequest mode ([#1628](https://github.com/TecharoHQ/anubis/issues/1628))
 
 ## v1.25.0: Necron
 

go.mod

@@ -106,7 +106,7 @@ require (
 	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
 	github.com/go-git/go-billy/v5 v5.6.2 // indirect
 	github.com/go-git/go-git/v5 v5.16.2 // indirect
-	github.com/go-jose/go-jose/v3 v3.0.4 // indirect
+	github.com/go-jose/go-jose/v3 v3.0.5 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-ole/go-ole v1.3.0 // indirect

go.sum

@@ -189,8 +189,8 @@ github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399 h1:eMj
 github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399/go.mod h1:1OCfN199q1Jm3HZlxleg+Dw/mwps2Wbk9frAWm+4FII=
 github.com/go-git/go-git/v5 v5.16.2 h1:fT6ZIOjE5iEnkzKyxTHK1W4HGAsPhqEqiSAssSO77hM=
 github.com/go-git/go-git/v5 v5.16.2/go.mod h1:4Ge4alE/5gPs30F2H1esi2gPd69R0C39lolkucHBOp8=
-github.com/go-jose/go-jose/v3 v3.0.4 h1:Wp5HA7bLQcKnf6YYao/4kpRpVMp/yf6+pJKV8WFSaNY=
-github.com/go-jose/go-jose/v3 v3.0.4/go.mod h1:5b+7YgP7ZICgJDBdfjZaIt+H/9L9T/YQrVfLAMboGkQ=
+github.com/go-jose/go-jose/v3 v3.0.5 h1:BLLJWbC4nMZOfuPVxoZIxeYsn6Nl2r1fITaJ78UQlVQ=
+github.com/go-jose/go-jose/v3 v3.0.5/go.mod h1:5b+7YgP7ZICgJDBdfjZaIt+H/9L9T/YQrVfLAMboGkQ=
 github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
 github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
 github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=

internal/honeypot/naive/naive.go

@@ -5,6 +5,7 @@ import (
 	_ "embed"
 	"fmt"
 	"log/slog"
+	"math"
 	"math/rand/v2"
 	"net/http"
 	"net/netip"
@@ -168,6 +169,9 @@ func (i *Impl) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
+	millisecondAmount := math.Pow(float64(networkCount), 2)
+	time.Sleep(time.Duration(millisecondAmount) * time.Millisecond)
+
 	spins := i.makeSpins()
 	affirmations := i.makeAffirmations()
 	title := i.makeTitle()

internal/test/playwright_test.go

@@ -595,7 +595,7 @@ func spawnAnubisWithOptions(t *testing.T, basePrefix string) string {
 		fmt.Fprintf(w, "<html><body><span id=anubis-test>%d</span></body></html>", time.Now().Unix())
 	})
 
-	policy, err := libanubis.LoadPoliciesOrDefault(t.Context(), "", anubis.DefaultDifficulty, "info")
+	policy, err := libanubis.LoadPoliciesOrDefault(t.Context(), "", anubis.DefaultDifficulty, "info", false)
 	if err != nil {
 		t.Fatal(err)
 	}

lib/anubis.go

@@ -33,6 +33,7 @@ import (
 	"github.com/TecharoHQ/anubis/lib/policy"
 	"github.com/TecharoHQ/anubis/lib/policy/checker"
 	"github.com/TecharoHQ/anubis/lib/store"
+	"github.com/TecharoHQ/anubis/web"
 	iptoasnv1 "github.com/TecharoHQ/thoth-proto/gen/techaro/thoth/iptoasn/v1"
 
 	// challenge implementations
@@ -97,6 +98,8 @@ type Server struct {
 	OGTags      *ogtags.OGTagCache
 	logger      *slog.Logger
 	opts        Options
+	basePrefix  string
+	publicURL   string
 	ed25519Priv ed25519.PrivateKey
 	hs512Secret []byte
 }
@@ -123,6 +126,42 @@ func (s *Server) getRequestLogger(r *http.Request) (*slog.Logger, *http.Request)
 	return lg, r
 }
 
+func (s *Server) configuredBasePrefix() string {
+	if s.basePrefix != "" {
+		return s.basePrefix
+	}
+	return strings.TrimRight(s.opts.BasePrefix, "/")
+}
+
+func (s *Server) configuredPublicURL() string {
+	if s.publicURL != "" {
+		return s.publicURL
+	}
+	return s.opts.PublicUrl
+}
+
+func (s *Server) prefixedPath(path string) string {
+	if !strings.HasPrefix(path, "/") {
+		path = "/" + path
+	}
+	return s.configuredBasePrefix() + path
+}
+
+func (s *Server) cookiePath() string {
+	basePrefix := s.configuredBasePrefix()
+	if basePrefix == "" {
+		return "/"
+	}
+	return basePrefix + "/"
+}
+
+func (s *Server) renderOptions() web.Options {
+	return web.Options{
+		BasePrefix: s.configuredBasePrefix(),
+		PublicURL:  s.configuredPublicURL(),
+	}
+}
+
 func (s *Server) getTokenKeyfunc() jwt.Keyfunc {
 	// return ED25519 key if HS512 is not set
 	if len(s.hs512Secret) == 0 {
@@ -186,7 +225,7 @@ func (s *Server) issueChallenge(ctx context.Context, r *http.Request, lg *slog.L
 		return nil, err
 	}
 
-	lg.Info("new challenge issued", "challenge", id.String())
+	lg.Info("new challenge issued", "challenge", id.String(), "weight", cr.Weight)
 
 	return &chall, err
 }
@@ -246,11 +285,7 @@ func (s *Server) maybeReverseProxy(w http.ResponseWriter, r *http.Request, httpS
 		return
 	}
 
-	// Adjust cookie path if base prefix is not empty
-	cookiePath := "/"
-	if anubis.BasePrefix != "" {
-		cookiePath = strings.TrimSuffix(anubis.BasePrefix, "/") + "/"
-	}
+	cookiePath := s.cookiePath()
 
 	cr, rule, err := s.check(r, lg)
 	if err != nil {
@@ -344,11 +379,7 @@ func (s *Server) maybeReverseProxy(w http.ResponseWriter, r *http.Request, httpS
 }
 
 func (s *Server) checkRules(w http.ResponseWriter, r *http.Request, cr policy.CheckResult, lg *slog.Logger, rule *policy.Bot) bool {
-	// Adjust cookie path if base prefix is not empty
-	cookiePath := "/"
-	if anubis.BasePrefix != "" {
-		cookiePath = strings.TrimSuffix(anubis.BasePrefix, "/") + "/"
-	}
+	cookiePath := s.cookiePath()
 
 	localizer := localization.GetLocalizer(r)
 
@@ -511,11 +542,7 @@ func (s *Server) PassChallenge(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// Adjust cookie path if base prefix is not empty
-	cookiePath := "/"
-	if anubis.BasePrefix != "" {
-		cookiePath = strings.TrimSuffix(anubis.BasePrefix, "/") + "/"
-	}
+	cookiePath := s.cookiePath()
 
 	if _, err := r.Cookie(anubis.TestCookieName); errors.Is(err, http.ErrNoCookie) {
 		s.ClearCookie(w, CookieOpts{Path: cookiePath, Host: r.Host})

lib/anubis_test.go

@@ -2,6 +2,7 @@ package lib
 
 import (
 	"bytes"
+	"compress/gzip"
 	"context"
 	"encoding/json"
 	"fmt"
@@ -58,7 +59,7 @@ func loadPolicies(t *testing.T, fname string, difficulty int) *policy.ParsedConf
 
 	t.Logf("loading policy file: %s", fname)
 
-	anubisPolicy, err := LoadPoliciesOrDefault(ctx, fname, difficulty, "info")
+	anubisPolicy, err := LoadPoliciesOrDefault(ctx, fname, difficulty, "info", false)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -250,7 +251,7 @@ func TestLoadPolicies(t *testing.T) {
 			}
 			defer fin.Close()
 
-			if _, err := policy.ParseConfig(t.Context(), fin, fname, 4, "info"); err != nil {
+			if _, err := policy.ParseConfig(t.Context(), fin, fname, 4, "info", false); err != nil {
 				t.Fatal(err)
 			}
 		})
@@ -501,8 +502,11 @@ func TestBasePrefix(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			// Reset the global BasePrefix before each test
-			anubis.BasePrefix = ""
+			originalBasePrefix := anubis.BasePrefix
+			anubis.BasePrefix = "/not-this-server"
+			t.Cleanup(func() {
+				anubis.BasePrefix = originalBasePrefix
+			})
 
 			pol := loadPolicies(t, "", 4)
 
@@ -631,10 +635,96 @@ func TestBasePrefix(t *testing.T) {
 			if ckie.Path != expectedPath {
 				t.Errorf("cookie path is wrong, wanted %s, got: %s", expectedPath, ckie.Path)
 			}
+
+			if anubis.BasePrefix != "/not-this-server" {
+				t.Errorf("New should not overwrite anubis.BasePrefix, got %q", anubis.BasePrefix)
+			}
 		})
 	}
 }
 
+func TestBasePrefixUsesServerConfigNotPackageGlobal(t *testing.T) {
+	originalBasePrefix := anubis.BasePrefix
+	anubis.BasePrefix = "/global"
+	t.Cleanup(func() {
+		anubis.BasePrefix = originalBasePrefix
+	})
+
+	pol := loadPolicies(t, "", 4)
+	srv := spawnAnubis(t, Options{
+		Next:       http.NewServeMux(),
+		Policy:     pol,
+		BasePrefix: "/local/",
+	})
+
+	if anubis.BasePrefix != "/global" {
+		t.Fatalf("New should leave anubis.BasePrefix alone, got %q", anubis.BasePrefix)
+	}
+
+	req := httptest.NewRequest(http.MethodPost, "/local/.within.website/x/cmd/anubis/api/make-challenge?redir=/", nil)
+	req.Header.Set("X-Real-Ip", "127.0.0.1")
+	rr := httptest.NewRecorder()
+
+	srv.ServeHTTP(rr, req)
+
+	if rr.Code != http.StatusOK {
+		t.Fatalf("expected local server prefix route to work, got status %d body %q", rr.Code, rr.Body.String())
+	}
+}
+
+func TestRenderIndexUsesServerBasePrefixNotPackageGlobal(t *testing.T) {
+	originalBasePrefix := anubis.BasePrefix
+	anubis.BasePrefix = "/global"
+	t.Cleanup(func() {
+		anubis.BasePrefix = originalBasePrefix
+	})
+
+	pol := loadPolicies(t, "", 4)
+	srv := spawnAnubis(t, Options{
+		Next:       http.NewServeMux(),
+		Policy:     pol,
+		BasePrefix: "/local/",
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/local/protected", nil)
+	req.Header.Set("X-Real-Ip", "127.0.0.1")
+	req.Header.Set("User-Agent", "Mozilla/5.0")
+	req.Header.Set("Accept-Encoding", "gzip")
+	rr := httptest.NewRecorder()
+
+	srv.ServeHTTP(rr, req)
+
+	resp := rr.Result()
+	defer resp.Body.Close()
+
+	var body strings.Builder
+	reader := io.Reader(resp.Body)
+	if resp.Header.Get("Content-Encoding") == "gzip" {
+		gzipReader, err := gzip.NewReader(resp.Body)
+		if err != nil {
+			t.Fatalf("opening gzip response should not fail: %v", err)
+		}
+		defer gzipReader.Close()
+		reader = gzipReader
+	}
+	if _, err := io.Copy(&body, reader); err != nil {
+		t.Fatalf("reading challenge response should not fail: %v", err)
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		t.Fatalf("expected challenge status %d, got %d body %q", http.StatusOK, resp.StatusCode, body.String())
+	}
+	if !strings.Contains(body.String(), "/local/.within.website/x/cmd/anubis/static/js/main.mjs") {
+		t.Fatalf("expected challenge assets to use server base prefix, body %q", body.String())
+	}
+	if strings.Contains(body.String(), "/global/.within.website") {
+		t.Fatalf("challenge body used package global base prefix: %q", body.String())
+	}
+	if anubis.BasePrefix != "/global" {
+		t.Fatalf("rendering should leave anubis.BasePrefix alone, got %q", anubis.BasePrefix)
+	}
+}
+
 func TestCustomStatusCodes(t *testing.T) {
 	h := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		t.Log(r.UserAgent())

lib/challenge/interface.go

@@ -44,11 +44,12 @@ func Methods() []string {
 }
 
 type IssueInput struct {
-	Impressum *config.Impressum
-	Rule      *policy.Bot
-	Challenge *Challenge
-	OGTags    map[string]string
-	Store     store.Interface
+	BasePrefix string
+	Impressum  *config.Impressum
+	Rule       *policy.Bot
+	Challenge  *Challenge
+	OGTags     map[string]string
+	Store      store.Interface
 }
 
 func (in *IssueInput) Valid() error {

lib/challenge/metarefresh/metarefresh.go

@@ -7,7 +7,6 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/TecharoHQ/anubis"
 	"github.com/TecharoHQ/anubis/lib/challenge"
 	"github.com/TecharoHQ/anubis/lib/localization"
 	"github.com/a-h/templ"
@@ -28,7 +27,7 @@ func (i *Impl) Issue(w http.ResponseWriter, r *http.Request, lg *slog.Logger, in
 		return nil, err
 	}
 
-	u, err := r.URL.Parse(anubis.BasePrefix + "/.within.website/x/cmd/anubis/api/pass-challenge")
+	u, err := r.URL.Parse(in.BasePrefix + "/.within.website/x/cmd/anubis/api/pass-challenge")
 	if err != nil {
 		return nil, fmt.Errorf("can't render page: %w", err)
 	}
@@ -47,7 +46,7 @@ func (i *Impl) Issue(w http.ResponseWriter, r *http.Request, lg *slog.Logger, in
 
 	loc := localization.GetLocalizer(r)
 
-	result := page(u.String(), in.Rule.Challenge.Difficulty, showMeta, loc)
+	result := page(in.BasePrefix, u.String(), in.Rule.Challenge.Difficulty, showMeta, loc)
 
 	return result, nil
 }

lib/challenge/metarefresh/metarefresh.templ

@@ -7,10 +7,10 @@ import (
 	"github.com/TecharoHQ/anubis/lib/localization"
 )
 
-templ page(redir string, difficulty int, showMeta bool, loc *localization.SimpleLocalizer) {
+templ page(basePrefix, redir string, difficulty int, showMeta bool, loc *localization.SimpleLocalizer) {
 	<div class="centered-div">
-		<img id="image" style="width:100%;max-width:256px;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version }/>
-		<img style="display:none;" style="width:100%;max-width:256px;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version }/>
+		<img id="image" style="width:100%;max-width:256px;" src={ basePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version }/>
+		<img style="display:none;" style="width:100%;max-width:256px;" src={ basePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version }/>
 		<p id="status">{ loc.T("loading") }</p>
 		<p>{ loc.T("connection_security") }</p>
 		if showMeta {

lib/challenge/metarefresh/metarefresh_templ.go

@@ -15,7 +15,7 @@ import (
 	"github.com/TecharoHQ/anubis/lib/localization"
 )
 
-func page(redir string, difficulty int, showMeta bool, loc *localization.SimpleLocalizer) templ.Component {
+func page(basePrefix, redir string, difficulty int, showMeta bool, loc *localization.SimpleLocalizer) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -41,9 +41,9 @@ func page(redir string, difficulty int, showMeta bool, loc *localization.SimpleL
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var2 string
-		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version)
+		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(basePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `metarefresh.templ`, Line: 12, Col: 165}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `metarefresh.templ`, Line: 12, Col: 158}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var2))
 		if templ_7745c5c3_Err != nil {
@@ -54,9 +54,9 @@ func page(redir string, difficulty int, showMeta bool, loc *localization.SimpleL
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var3 string
-		templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version)
+		templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.JoinStringErrs(basePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `metarefresh.templ`, Line: 13, Col: 174}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `metarefresh.templ`, Line: 13, Col: 167}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var3))
 		if templ_7745c5c3_Err != nil {

lib/challenge/preact/preact.go

@@ -10,7 +10,6 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/TecharoHQ/anubis"
 	"github.com/TecharoHQ/anubis/internal"
 	"github.com/TecharoHQ/anubis/lib/challenge"
 	"github.com/TecharoHQ/anubis/lib/localization"
@@ -43,7 +42,7 @@ func (i *impl) Issue(w http.ResponseWriter, r *http.Request, lg *slog.Logger, in
 		return nil, err
 	}
 
-	u, err := r.URL.Parse(anubis.BasePrefix + "/.within.website/x/cmd/anubis/api/pass-challenge")
+	u, err := r.URL.Parse(in.BasePrefix + "/.within.website/x/cmd/anubis/api/pass-challenge")
 	if err != nil {
 		return nil, fmt.Errorf("can't render page: %w", err)
 	}
@@ -55,7 +54,7 @@ func (i *impl) Issue(w http.ResponseWriter, r *http.Request, lg *slog.Logger, in
 
 	loc := localization.GetLocalizer(r)
 
-	result := page(u.String(), in.Challenge.RandomData, in.Rule.Challenge.Difficulty, loc)
+	result := page(in.BasePrefix, u.String(), in.Challenge.RandomData, in.Rule.Challenge.Difficulty, loc)
 
 	return result, nil
 }

lib/challenge/preact/preact.templ

@@ -5,10 +5,10 @@ import (
 	"github.com/TecharoHQ/anubis/lib/localization"
 )
 
-templ page(redir, challenge string, difficulty int, loc *localization.SimpleLocalizer) {
+templ page(basePrefix, redir, challenge string, difficulty int, loc *localization.SimpleLocalizer) {
 	<div class="centered-div">
 		<div id="app">
-			<img id="image" style="width:100%;max-width:256px;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version }/>
+			<img id="image" style="width:100%;max-width:256px;" src={ basePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version }/>
 			<p id="status">{ loc.T("loading") }</p>
 			<p>{ loc.T("connection_security") }</p>
 		</div>
@@ -18,7 +18,7 @@ templ page(redir, challenge string, difficulty int, loc *localization.SimpleLoca
 			"difficulty":                  difficulty,
 			"connection_security_message": loc.T("connection_security"),
 			"loading_message":             loc.T("loading"),
-			"pensive_url":                 anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version,
+			"pensive_url":                 basePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version,
 		})
 		@templ.ComponentFunc(renderAppJS)
 		<noscript>

lib/challenge/preact/preact_templ.go

@@ -13,7 +13,7 @@ import (
 	"github.com/TecharoHQ/anubis/lib/localization"
 )
 
-func page(redir, challenge string, difficulty int, loc *localization.SimpleLocalizer) templ.Component {
+func page(basePrefix, redir, challenge string, difficulty int, loc *localization.SimpleLocalizer) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -39,9 +39,9 @@ func page(redir, challenge string, difficulty int, loc *localization.SimpleLocal
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var2 string
-		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version)
+		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(basePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `preact.templ`, Line: 11, Col: 166}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `preact.templ`, Line: 11, Col: 159}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var2))
 		if templ_7745c5c3_Err != nil {
@@ -83,7 +83,7 @@ func page(redir, challenge string, difficulty int, loc *localization.SimpleLocal
 			"difficulty":                  difficulty,
 			"connection_security_message": loc.T("connection_security"),
 			"loading_message":             loc.T("loading"),
-			"pensive_url":                 anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version,
+			"pensive_url":                 basePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version,
 		}).Render(ctx, templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err

lib/challenge/proofofwork/proofofwork.go

@@ -29,7 +29,7 @@ func (i *Impl) Setup(mux *http.ServeMux) {}
 
 func (i *Impl) Issue(w http.ResponseWriter, r *http.Request, lg *slog.Logger, in *chall.IssueInput) (templ.Component, error) {
 	loc := localization.GetLocalizer(r)
-	return page(loc), nil
+	return page(in.BasePrefix, loc), nil
 }
 
 func (i *Impl) Validate(r *http.Request, lg *slog.Logger, in *chall.ValidateInput) error {

lib/challenge/proofofwork/proofofwork.templ

@@ -5,12 +5,12 @@ import (
 	"github.com/TecharoHQ/anubis/lib/localization"
 )
 
-templ page(localizer *localization.SimpleLocalizer) {
+templ page(basePrefix string, localizer *localization.SimpleLocalizer) {
 	<div class="centered-div">
-		<img id="image" style="width:100%;max-width:256px;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version }/>
-		<img style="display:none;" style="width:100%;max-width:256px;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version }/>
+		<img id="image" style="width:100%;max-width:256px;" src={ basePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version }/>
+		<img style="display:none;" style="width:100%;max-width:256px;" src={ basePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version }/>
 		<p id="status">{ localizer.T("loading") }</p>
-		<script async type="module" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=" + anubis.Version }></script>
+		<script async type="module" src={ basePrefix + "/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=" + anubis.Version }></script>
 		<div id="progress" role="progressbar" aria-labelledby="status">
 			<div class="bar-inner"></div>
 		</div>

lib/challenge/proofofwork/proofofwork_templ.go

@@ -13,7 +13,7 @@ import (
 	"github.com/TecharoHQ/anubis/lib/localization"
 )
 
-func page(localizer *localization.SimpleLocalizer) templ.Component {
+func page(basePrefix string, localizer *localization.SimpleLocalizer) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -39,9 +39,9 @@ func page(localizer *localization.SimpleLocalizer) templ.Component {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var2 string
-		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version)
+		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(basePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `proofofwork.templ`, Line: 10, Col: 165}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `proofofwork.templ`, Line: 10, Col: 158}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var2))
 		if templ_7745c5c3_Err != nil {
@@ -52,9 +52,9 @@ func page(localizer *localization.SimpleLocalizer) templ.Component {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var3 string
-		templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version)
+		templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.JoinStringErrs(basePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `proofofwork.templ`, Line: 11, Col: 174}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `proofofwork.templ`, Line: 11, Col: 167}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var3))
 		if templ_7745c5c3_Err != nil {
@@ -78,9 +78,9 @@ func page(localizer *localization.SimpleLocalizer) templ.Component {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var5 string
-		templ_7745c5c3_Var5, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=" + anubis.Version)
+		templ_7745c5c3_Var5, templ_7745c5c3_Err = templ.JoinStringErrs(basePrefix + "/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `proofofwork.templ`, Line: 13, Col: 136}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `proofofwork.templ`, Line: 13, Col: 129}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var5))
 		if templ_7745c5c3_Err != nil {

lib/config.go

@@ -55,7 +55,7 @@ type Options struct {
 	DifficultyInJWT          bool
 }
 
-func LoadPoliciesOrDefault(ctx context.Context, fname string, defaultDifficulty int, logLevel string) (*policy.ParsedConfig, error) {
+func LoadPoliciesOrDefault(ctx context.Context, fname string, defaultDifficulty int, logLevel string, subrequestMode bool) (*policy.ParsedConfig, error) {
 	var fin io.ReadCloser
 	var err error
 
@@ -79,7 +79,7 @@ func LoadPoliciesOrDefault(ctx context.Context, fname string, defaultDifficulty
 		}
 	}(fin)
 
-	anubisPolicy, err := policy.ParseConfig(ctx, fin, fname, defaultDifficulty, logLevel)
+	anubisPolicy, err := policy.ParseConfig(ctx, fin, fname, defaultDifficulty, logLevel, subrequestMode)
 	if err != nil {
 		return nil, fmt.Errorf("can't parse policy file %s: %w", fname, err)
 	}
@@ -112,8 +112,7 @@ func New(opts Options) (*Server, error) {
 		opts.ED25519PrivateKey = priv
 	}
 
-	anubis.BasePrefix = strings.TrimRight(opts.BasePrefix, "/")
-	anubis.PublicUrl = opts.PublicUrl
+	opts.BasePrefix = strings.TrimRight(opts.BasePrefix, "/")
 
 	result := &Server{
 		next:        opts.Next,
@@ -121,6 +120,8 @@ func New(opts Options) (*Server, error) {
 		hs512Secret: opts.HS512Secret,
 		policy:      opts.Policy,
 		opts:        opts,
+		basePrefix:  opts.BasePrefix,
+		publicURL:   opts.PublicUrl,
 		OGTags: ogtags.NewOGTagCache(opts.Target, opts.Policy.OpenGraph, opts.Policy.Store, ogtags.TargetOptions{
 			Host:               opts.TargetHost,
 			SNI:                opts.TargetSNI,
@@ -131,28 +132,20 @@ func New(opts Options) (*Server, error) {
 	}
 
 	mux := http.NewServeMux()
-	xess.Mount(mux)
+	xessPrefix := result.prefixedPath(xess.BasePrefix)
+	mux.Handle(xessPrefix, internal.UnchangingCache(http.StripPrefix(xessPrefix, http.FileServerFS(xess.Static))))
 
-	// Helper to add global prefix
+	// Helper to add the server-local base prefix.
 	registerWithPrefix := func(pattern string, handler http.Handler, method string) {
 		if method != "" {
 			method = method + " " // methods must end with a space to register with them
 		}
 
-		// Ensure there's no double slash when concatenating BasePrefix and pattern
-		basePrefix := strings.TrimSuffix(anubis.BasePrefix, "/")
-		prefix := method + basePrefix
-
-		// If pattern doesn't start with a slash, add one
-		if !strings.HasPrefix(pattern, "/") {
-			pattern = "/" + pattern
-		}
-
-		mux.Handle(prefix+pattern, handler)
+		mux.Handle(method+result.prefixedPath(pattern), handler)
 	}
 
 	// Ensure there's no double slash when concatenating BasePrefix and StaticPath
-	stripPrefix := strings.TrimSuffix(anubis.BasePrefix, "/") + anubis.StaticPath
+	stripPrefix := result.prefixedPath(anubis.StaticPath)
 	registerWithPrefix(anubis.StaticPath, internal.UnchangingCache(internal.NoBrowsing(http.StripPrefix(stripPrefix, http.FileServerFS(web.Static)))), "")
 
 	if opts.ServeRobotsTXT {
@@ -166,9 +159,10 @@ func New(opts Options) (*Server, error) {
 
 	if opts.Policy.Impressum != nil {
 		registerWithPrefix(anubis.APIPrefix+"imprint", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			templ.Handler(
-				web.Base(opts.Policy.Impressum.Page.Title, opts.Policy.Impressum.Page, opts.Policy.Impressum, localization.GetLocalizer(r)),
-			).ServeHTTP(w, r)
+			handler := templ.Handler(
+				web.BaseWithOptions(result.renderOptions(), opts.Policy.Impressum.Page.Title, opts.Policy.Impressum.Page, opts.Policy.Impressum, localization.GetLocalizer(r)),
+			)
+			handler.ServeHTTP(w, r)
 		}), "GET")
 	}
 

lib/config_test.go

@@ -12,7 +12,7 @@ import (
 )
 
 func TestInvalidChallengeMethod(t *testing.T) {
-	if _, err := LoadPoliciesOrDefault(t.Context(), "testdata/invalid-challenge-method.yaml", 4, "info"); !errors.Is(err, policy.ErrChallengeRuleHasWrongAlgorithm) {
+	if _, err := LoadPoliciesOrDefault(t.Context(), "testdata/invalid-challenge-method.yaml", 4, "info", false); !errors.Is(err, policy.ErrChallengeRuleHasWrongAlgorithm) {
 		t.Fatalf("wanted error %v but got %v", policy.ErrChallengeRuleHasWrongAlgorithm, err)
 	}
 }
@@ -25,7 +25,7 @@ func TestBadConfigs(t *testing.T) {
 
 	for _, st := range finfos {
 		t.Run(st.Name(), func(t *testing.T) {
-			if _, err := LoadPoliciesOrDefault(t.Context(), filepath.Join("config", "testdata", "bad", st.Name()), anubis.DefaultDifficulty, "info"); err == nil {
+			if _, err := LoadPoliciesOrDefault(t.Context(), filepath.Join("config", "testdata", "bad", st.Name()), anubis.DefaultDifficulty, "info", false); err == nil {
 				t.Fatal(err)
 			} else {
 				t.Log(err)
@@ -44,13 +44,13 @@ func TestGoodConfigs(t *testing.T) {
 		t.Run(st.Name(), func(t *testing.T) {
 			t.Run("with-thoth", func(t *testing.T) {
 				ctx := thothmock.WithMockThoth(t)
-				if _, err := LoadPoliciesOrDefault(ctx, filepath.Join("config", "testdata", "good", st.Name()), anubis.DefaultDifficulty, "info"); err != nil {
+				if _, err := LoadPoliciesOrDefault(ctx, filepath.Join("config", "testdata", "good", st.Name()), anubis.DefaultDifficulty, "info", false); err != nil {
 					t.Fatal(err)
 				}
 			})
 
 			t.Run("without-thoth", func(t *testing.T) {
-				if _, err := LoadPoliciesOrDefault(t.Context(), filepath.Join("config", "testdata", "good", st.Name()), anubis.DefaultDifficulty, "info"); err != nil {
+				if _, err := LoadPoliciesOrDefault(t.Context(), filepath.Join("config", "testdata", "good", st.Name()), anubis.DefaultDifficulty, "info", false); err != nil {
 					t.Fatal(err)
 				}
 			})

lib/http.go

@@ -193,7 +193,7 @@ func (s *Server) RenderIndex(w http.ResponseWriter, r *http.Request, cr policy.C
 	localizer := localization.GetLocalizer(r)
 
 	if returnHTTPStatusOnly {
-		if s.opts.PublicUrl == "" {
+		if s.configuredPublicURL() == "" {
 			w.WriteHeader(http.StatusUnauthorized)
 			w.Write([]byte(localizer.T("authorization_required")))
 		} else {
@@ -263,11 +263,12 @@ func (s *Server) RenderIndex(w http.ResponseWriter, r *http.Request, cr policy.C
 	}
 
 	in := &challenge.IssueInput{
-		Impressum: s.policy.Impressum,
-		Rule:      rule,
-		Challenge: chall,
-		OGTags:    ogTags,
-		Store:     s.store,
+		BasePrefix: s.configuredBasePrefix(),
+		Impressum:  s.policy.Impressum,
+		Rule:       rule,
+		Challenge:  chall,
+		OGTags:     ogTags,
+		Store:      s.store,
 	}
 
 	component, err := impl.Issue(w, r, lg, in)
@@ -277,7 +278,8 @@ func (s *Server) RenderIndex(w http.ResponseWriter, r *http.Request, cr policy.C
 		return
 	}
 
-	page := web.BaseWithChallengeAndOGTags(
+	page := web.BaseWithChallengeAndOGTagsWithOptions(
+		s.renderOptions(),
 		localizer.T("making_sure_not_bot"),
 		component,
 		s.policy.Impressum,
@@ -323,15 +325,17 @@ func (s *Server) constructRedirectURL(r *http.Request) (string, error) {
 
 	redir := proto + "://" + host + uri
 	escapedURL := url.QueryEscape(redir)
-	return fmt.Sprintf("%s/.within.website/?redir=%s", s.opts.PublicUrl, escapedURL), nil
+	return fmt.Sprintf("%s/.within.website/?redir=%s", s.configuredPublicURL(), escapedURL), nil
 }
 
 func (s *Server) RenderBench(w http.ResponseWriter, r *http.Request) {
 	localizer := localization.GetLocalizer(r)
+	opts := s.renderOptions()
 
-	templ.Handler(
-		web.Base(localizer.T("benchmarking_anubis"), web.Bench(localizer), s.policy.Impressum, localizer),
-	).ServeHTTP(w, r)
+	handler := templ.Handler(
+		web.BaseWithOptions(opts, localizer.T("benchmarking_anubis"), web.BenchWithOptions(opts, localizer), s.policy.Impressum, localizer),
+	)
+	handler.ServeHTTP(w, r)
 }
 
 func (s *Server) respondWithError(w http.ResponseWriter, r *http.Request, message, code string) {
@@ -340,10 +344,12 @@ func (s *Server) respondWithError(w http.ResponseWriter, r *http.Request, messag
 
 func (s *Server) respondWithStatus(w http.ResponseWriter, r *http.Request, msg, code string, status int) {
 	localizer := localization.GetLocalizer(r)
+	opts := s.renderOptions()
 
-	component := web.Base(
+	component := web.BaseWithOptions(
+		opts,
 		localizer.T("oh_noes"),
-		web.ErrorPage(msg, s.opts.WebmasterEmail, code, localizer),
+		web.ErrorPageWithOptions(opts, msg, s.opts.WebmasterEmail, code, localizer),
 		s.policy.Impressum,
 		localizer,
 	)
@@ -352,17 +358,25 @@ func (s *Server) respondWithStatus(w http.ResponseWriter, r *http.Request, msg,
 }
 
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	if strings.HasPrefix(r.URL.Path, anubis.BasePrefix+anubis.StaticPath) {
+	if strings.HasPrefix(r.URL.Path, s.prefixedPath(anubis.StaticPath)) {
 		s.mux.ServeHTTP(w, r)
 		return
-	} else if strings.HasPrefix(r.URL.Path, anubis.BasePrefix+xess.BasePrefix) {
+	} else if strings.HasPrefix(r.URL.Path, s.prefixedPath(xess.BasePrefix)) {
 		s.mux.ServeHTTP(w, r)
 		return
 	}
 
 	// Forward robots.txt requests to mux when ServeRobotsTXT is enabled
 	if s.opts.ServeRobotsTXT {
-		path := strings.TrimPrefix(r.URL.Path, anubis.BasePrefix)
+		path := r.URL.Path
+		basePrefix := s.configuredBasePrefix()
+		if basePrefix != "" {
+			if !strings.HasPrefix(path, basePrefix) {
+				s.maybeReverseProxyOrPage(w, r)
+				return
+			}
+			path = strings.TrimPrefix(path, basePrefix)
+		}
 		if path == "/robots.txt" || path == "/.well-known/robots.txt" {
 			s.mux.ServeHTTP(w, r)
 			return
@@ -373,11 +387,11 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func (s *Server) stripBasePrefixFromRequest(r *http.Request) *http.Request {
-	if !s.opts.StripBasePrefix || s.opts.BasePrefix == "" {
+	basePrefix := s.configuredBasePrefix()
+	if !s.opts.StripBasePrefix || basePrefix == "" {
 		return r
 	}
 
-	basePrefix := strings.TrimSuffix(s.opts.BasePrefix, "/")
 	path := r.URL.Path
 
 	if !strings.HasPrefix(path, basePrefix) {
@@ -441,9 +455,11 @@ func (s *Server) ServeHTTPNext(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
-		templ.Handler(
-			web.Base(localizer.T("you_are_not_a_bot"), web.StaticHappy(localizer), s.policy.Impressum, localizer),
-		).ServeHTTP(w, r)
+		opts := s.renderOptions()
+		handler := templ.Handler(
+			web.BaseWithOptions(opts, localizer.T("you_are_not_a_bot"), web.StaticHappyWithOptions(opts, localizer), s.policy.Impressum, localizer),
+		)
+		handler.ServeHTTP(w, r)
 	} else {
 		asn, asnDesc := asnFromContext(r.Context())
 		requestsProxied.WithLabelValues(r.Host, asn, asnDesc).Inc()

lib/policy/celchecker.go

@@ -13,11 +13,12 @@ import (
 )
 
 type CELChecker struct {
-	program cel.Program
-	src     string
+	program        cel.Program
+	src            string
+	subRequestMode bool
 }
 
-func NewCELChecker(cfg *config.ExpressionOrList, dnsObj *dns.Dns) (*CELChecker, error) {
+func NewCELChecker(cfg *config.ExpressionOrList, dnsObj *dns.Dns, subRequestMode bool) (*CELChecker, error) {
 	env, err := expressions.BotEnvironment(dnsObj)
 	if err != nil {
 		return nil, err
@@ -29,8 +30,9 @@ func NewCELChecker(cfg *config.ExpressionOrList, dnsObj *dns.Dns) (*CELChecker,
 	}
 
 	return &CELChecker{
-		src:     cfg.String(),
-		program: program,
+		src:            cfg.String(),
+		program:        program,
+		subRequestMode: subRequestMode,
 	}, nil
 }
 
@@ -39,7 +41,7 @@ func (cc *CELChecker) Hash() string {
 }
 
 func (cc *CELChecker) Check(r *http.Request) (bool, error) {
-	result, _, err := cc.program.ContextEval(r.Context(), &CELRequest{r})
+	result, _, err := cc.program.ContextEval(r.Context(), &CELRequest{r, cc.subRequestMode})
 
 	if err != nil {
 		return false, err
@@ -54,6 +56,7 @@ func (cc *CELChecker) Check(r *http.Request) (bool, error) {
 
 type CELRequest struct {
 	*http.Request
+	subRequestMode bool
 }
 
 func (cr *CELRequest) Parent() cel.Activation { return nil }
@@ -71,6 +74,14 @@ func (cr *CELRequest) ResolveName(name string) (any, bool) {
 	case "userAgent":
 		return cr.UserAgent(), true
 	case "path":
+		if cr.subRequestMode {
+			if xou := cr.Header.Get("X-Original-URI"); xou != "" {
+				return xou, true
+			}
+			if xfu := cr.Header.Get("X-Forwarded-Uri"); xfu != "" {
+				return xfu, true
+			}
+		}
 		return cr.URL.Path, true
 	case "query":
 		return expressions.URLValues{Values: cr.URL.Query()}, true

lib/policy/celchecker_test.go

@@ -23,7 +23,7 @@ func TestCELChecker_MapIterationWrappers(t *testing.T) {
 		Expression: `headers.exists(k, k == "Accept") && query.exists(k, k == "format")`,
 	}
 
-	checker, err := NewCELChecker(cfg, newTestDNS(t))
+	checker, err := NewCELChecker(cfg, newTestDNS(t), false)
 	if err != nil {
 		t.Fatalf("creating CEL checker failed: %v", err)
 	}
@@ -42,3 +42,77 @@ func TestCELChecker_MapIterationWrappers(t *testing.T) {
 		t.Fatal("expected expression to evaluate true")
 	}
 }
+
+func TestCELChecker_PathWithForwardedUri(t *testing.T) {
+	tests := []struct {
+		name           string
+		expression     string
+		xForwardedUri  string
+		urlPath        string
+		subRequestMode bool
+		want           bool
+	}{
+		{
+			name:           "path matches X-Forwarded-Uri in subrequest mode",
+			expression:     `path.startsWith("/admin")`,
+			xForwardedUri:  "/admin/secret",
+			urlPath:        "/.within.website/x/cmd/anubis/api/check",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "path with query string",
+			expression:     `path.startsWith("/api/secret")`,
+			xForwardedUri:  "/api/secret?token=abc",
+			urlPath:        "/.within.website/x/cmd/anubis/api/check",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "path falls back to url path when no header",
+			expression:     `path == "/public/page"`,
+			urlPath:        "/public/page",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "non-subrequest mode ignores X-Forwarded-Uri",
+			expression:     `path.startsWith("/admin")`,
+			xForwardedUri:  "/admin/secret",
+			urlPath:        "/public/page",
+			subRequestMode: false,
+			want:           false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cfg := &config.ExpressionOrList{
+				Expression: tt.expression,
+			}
+			checker, err := NewCELChecker(cfg, newTestDNS(t), tt.subRequestMode)
+			if err != nil {
+				t.Fatalf("NewCELChecker() error: %v", err)
+			}
+
+			req, err := http.NewRequest(http.MethodGet, "http://example.com"+tt.urlPath, nil)
+			if err != nil {
+				t.Fatalf("http.NewRequest: %v", err)
+			}
+
+			if tt.xForwardedUri != "" {
+				req.Header.Set("X-Forwarded-Uri", tt.xForwardedUri)
+			}
+
+			got, err := checker.Check(req)
+			if err != nil {
+				t.Fatalf("Check() error: %v", err)
+			}
+
+			if got != tt.want {
+				t.Errorf("Check() = %v, want %v (subRequestMode=%v, urlPath=%q, X-Forwarded-Uri=%q)",
+					got, tt.want, tt.subRequestMode, tt.urlPath, tt.xForwardedUri)
+			}
+		})
+	}
+}

lib/policy/checker.go

@@ -94,23 +94,29 @@ func (hmc *HeaderMatchesChecker) Hash() string {
 }
 
 type PathChecker struct {
-	regexp *regexp.Regexp
-	hash   string
+	regexp         *regexp.Regexp
+	hash           string
+	subRequestMode bool
 }
 
-func NewPathChecker(rexStr string) (checker.Impl, error) {
+func NewPathChecker(rexStr string, subrequestMode bool) (checker.Impl, error) {
 	rex, err := regexp.Compile(strings.TrimSpace(rexStr))
 	if err != nil {
 		return nil, fmt.Errorf("%w: regex %s failed parse: %w", ErrMisconfiguration, rexStr, err)
 	}
-	return &PathChecker{rex, internal.FastHash(rexStr)}, nil
+	return &PathChecker{rex, internal.FastHash(rexStr), subrequestMode}, nil
 }
 
 func (pc *PathChecker) Check(r *http.Request) (bool, error) {
-	originalUrl := r.Header.Get("X-Original-URI")
-	if originalUrl != "" {
-		if pc.regexp.MatchString(originalUrl) {
-			return true, nil
+	if pc.subRequestMode {
+		originalUrl := r.Header.Get("X-Original-URI")
+		if originalUrl == "" {
+			originalUrl = r.Header.Get("X-Forwarded-Uri")
+		}
+		if originalUrl != "" {
+			if pc.regexp.MatchString(originalUrl) {
+				return true, nil
+			}
 		}
 	}
 

lib/policy/checker_test.go

@@ -272,8 +272,8 @@ func TestPathChecker_XOriginalURI(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			// Create the PathChecker
-			pc, err := NewPathChecker(tt.regex)
+			// Create the PathChecker in subrequest mode so X-Original-URI is honored.
+			pc, err := NewPathChecker(tt.regex, true)
 			if err != nil {
 				if !tt.expectError {
 					t.Fatalf("NewPathChecker() unexpected error: %v", err)
@@ -305,3 +305,224 @@ func TestPathChecker_XOriginalURI(t *testing.T) {
 		})
 	}
 }
+
+// TestPathChecker_GHSA_6wcg_mqvh_fcvg is a regression test for
+// https://github.com/TecharoHQ/anubis/security/advisories/GHSA-6wcg-mqvh-fcvg.
+//
+// PR https://github.com/TecharoHQ/anubis/pull/1015 added the ability for
+// reverse proxies using Anubis in subrequest auth mode to look at the path
+// of a request as there are many rules in the wild that rely on checking
+// the path. This is how access to things like robots.txt or anything in the
+// .well-known directory is unaffected by Anubis.
+//
+// However this logic was also enabled for non-subrequest deployments of Anubis,
+// meaning that a specially crafted request could include a /.well-known/
+// path in it and then get around Anubis with little effort.
+//
+// This fix gates the logic behind a new plumbed variable named subrequestMode
+// that only fires when Anubis is running in subrequest auth mode. This
+// properly contains that workaround so that the logic does not fire in
+// most deployments.
+func TestPathChecker_GHSA_6wcg_mqvh_fcvg(t *testing.T) {
+	tests := []struct {
+		name           string
+		regex          string
+		urlPath        string
+		xOriginalURI   string
+		subRequestMode bool
+		want           bool
+	}{
+		{
+			name:           "default mode ignores spoofed X-Original-URI when real path matches",
+			regex:          "^/admin/.*",
+			urlPath:        "/admin/secret",
+			xOriginalURI:   "/public/index",
+			subRequestMode: false,
+			want:           true,
+		},
+		{
+			name:           "default mode ignores spoofed X-Original-URI when real path does not match",
+			regex:          "^/admin/.*",
+			urlPath:        "/public/index",
+			xOriginalURI:   "/admin/secret",
+			subRequestMode: false,
+			want:           false,
+		},
+		{
+			name:           "default mode without X-Original-URI matches real path",
+			regex:          "^/admin/.*",
+			urlPath:        "/admin/dashboard",
+			xOriginalURI:   "",
+			subRequestMode: false,
+			want:           true,
+		},
+		{
+			name:           "subrequest mode honors X-Original-URI",
+			regex:          "^/admin/.*",
+			urlPath:        "/auth",
+			xOriginalURI:   "/admin/secret",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "subrequest mode falls back to URL.Path when X-Original-URI does not match",
+			regex:          "^/admin/.*",
+			urlPath:        "/admin/dashboard",
+			xOriginalURI:   "/public/index",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "subrequest mode with empty X-Original-URI uses URL.Path",
+			regex:          "^/admin/.*",
+			urlPath:        "/admin/dashboard",
+			xOriginalURI:   "",
+			subRequestMode: true,
+			want:           true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			pc, err := NewPathChecker(tt.regex, tt.subRequestMode)
+			if err != nil {
+				t.Fatalf("NewPathChecker(%q, %v) returned error: %v", tt.regex, tt.subRequestMode, err)
+			}
+
+			req, err := http.NewRequest(http.MethodGet, "http://example.com"+tt.urlPath, nil)
+			if err != nil {
+				t.Fatalf("http.NewRequest: %v", err)
+			}
+
+			if tt.xOriginalURI != "" {
+				req.Header.Set("X-Original-URI", tt.xOriginalURI)
+			}
+
+			got, err := pc.Check(req)
+			if err != nil {
+				t.Fatalf("Check() unexpected error: %v", err)
+			}
+
+			if got != tt.want {
+				t.Errorf("Check() = %v, want %v (subRequestMode=%v, urlPath=%q, X-Original-URI=%q)",
+					got, tt.want, tt.subRequestMode, tt.urlPath, tt.xOriginalURI)
+			}
+		})
+	}
+}
+
+func TestPathChecker_XForwardedUri(t *testing.T) {
+	tests := []struct {
+		name           string
+		regex          string
+		xForwardedUri  string
+		xOriginalURI   string
+		urlPath        string
+		subRequestMode bool
+		want           bool
+	}{
+		{
+			name:           "X-Forwarded-Uri matches regex in subrequest mode",
+			regex:          "^/admin/.*",
+			xForwardedUri:  "/admin/users",
+			urlPath:        "/.within.website/x/cmd/anubis/api/check",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "X-Forwarded-Uri with query string",
+			regex:          "^/admin/.*",
+			xForwardedUri:  "/admin/users?page=1",
+			urlPath:        "/.within.website/x/cmd/anubis/api/check",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "X-Original-URI takes priority over X-Forwarded-Uri",
+			regex:          "^/admin/.*",
+			xForwardedUri:  "/public/page",
+			xOriginalURI:   "/admin/users",
+			urlPath:        "/.within.website/x/cmd/anubis/api/check",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "falls back to X-Forwarded-Uri when no X-Original-URI",
+			regex:          "^/admin/.*",
+			xForwardedUri:  "/admin/dashboard",
+			urlPath:        "/.within.website/x/cmd/anubis/api/check",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "neither header matches, url path matches",
+			regex:          "^/public/.*",
+			xForwardedUri:  "/admin/users",
+			urlPath:        "/public/page",
+			subRequestMode: true,
+			want:           true,
+		},
+		{
+			name:           "nothing matches",
+			regex:          "^/admin/.*",
+			xForwardedUri:  "/public/page",
+			urlPath:        "/.within.website/x/cmd/anubis/api/check",
+			subRequestMode: true,
+			want:           false,
+		},
+		{
+			name:           "non-subrequest mode ignores X-Forwarded-Uri",
+			regex:          "^/admin/.*",
+			xForwardedUri:  "/admin/users",
+			urlPath:        "/public/page",
+			subRequestMode: false,
+			want:           false,
+		},
+		{
+			name:           "non-subrequest mode uses url path",
+			regex:          "^/admin/.*",
+			xForwardedUri:  "/public/page",
+			urlPath:        "/admin/secret",
+			subRequestMode: false,
+			want:           true,
+		},
+		{
+			name:           "empty X-Forwarded-Uri falls back to url path",
+			regex:          "^/check$",
+			urlPath:        "/check",
+			subRequestMode: true,
+			want:           true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			pc, err := NewPathChecker(tt.regex, tt.subRequestMode)
+			if err != nil {
+				t.Fatalf("NewPathChecker(%q, %v) returned error: %v", tt.regex, tt.subRequestMode, err)
+			}
+
+			req, err := http.NewRequest(http.MethodGet, "http://example.com"+tt.urlPath, nil)
+			if err != nil {
+				t.Fatalf("http.NewRequest: %v", err)
+			}
+
+			if tt.xForwardedUri != "" {
+				req.Header.Set("X-Forwarded-Uri", tt.xForwardedUri)
+			}
+			if tt.xOriginalURI != "" {
+				req.Header.Set("X-Original-URI", tt.xOriginalURI)
+			}
+
+			got, err := pc.Check(req)
+			if err != nil {
+				t.Fatalf("Check() unexpected error: %v", err)
+			}
+
+			if got != tt.want {
+				t.Errorf("Check() = %v, want %v (subRequestMode=%v, urlPath=%q, X-Forwarded-Uri=%q, X-Original-URI=%q)",
+					got, tt.want, tt.subRequestMode, tt.urlPath, tt.xForwardedUri, tt.xOriginalURI)
+			}
+		})
+	}
+}

lib/policy/policy.go

@@ -60,7 +60,7 @@ func newParsedConfig(orig *config.Config) *ParsedConfig {
 	}
 }
 
-func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDifficulty int, logLevel string) (*ParsedConfig, error) {
+func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDifficulty int, logLevel string, subrequestMode bool) (*ParsedConfig, error) {
 	c, err := config.Load(fin, fname)
 	if err != nil {
 		return nil, err
@@ -152,7 +152,7 @@ func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDiffic
 		}
 
 		if b.PathRegex != nil {
-			c, err := NewPathChecker(*b.PathRegex)
+			c, err := NewPathChecker(*b.PathRegex, subrequestMode)
 			if err != nil {
 				validationErrs = append(validationErrs, fmt.Errorf("while processing rule %s path regex: %w", b.Name, err))
 			} else {
@@ -170,7 +170,7 @@ func ParseConfig(ctx context.Context, fin io.Reader, fname string, defaultDiffic
 		}
 
 		if b.Expression != nil {
-			c, err := NewCELChecker(b.Expression, result.Dns)
+			c, err := NewCELChecker(b.Expression, result.Dns, subrequestMode)
 			if err != nil {
 				validationErrs = append(validationErrs, fmt.Errorf("while processing rule %s expressions: %w", b.Name, err))
 			} else {

lib/policy/policy_test.go

@@ -19,7 +19,7 @@ func TestDefaultPolicyMustParse(t *testing.T) {
 	}
 	defer fin.Close()
 
-	if _, err := ParseConfig(ctx, fin, "botPolicies.yaml", anubis.DefaultDifficulty, "info"); err != nil {
+	if _, err := ParseConfig(ctx, fin, "botPolicies.yaml", anubis.DefaultDifficulty, "info", false); err != nil {
 		t.Fatalf("can't parse config: %v", err)
 	}
 }
@@ -41,7 +41,7 @@ func TestGoodConfigs(t *testing.T) {
 				defer fin.Close()
 
 				ctx := thothmock.WithMockThoth(t)
-				if _, err := ParseConfig(ctx, fin, fin.Name(), anubis.DefaultDifficulty, "info"); err != nil {
+				if _, err := ParseConfig(ctx, fin, fin.Name(), anubis.DefaultDifficulty, "info", false); err != nil {
 					t.Fatal(err)
 				}
 			})
@@ -53,7 +53,7 @@ func TestGoodConfigs(t *testing.T) {
 				}
 				defer fin.Close()
 
-				if _, err := ParseConfig(t.Context(), fin, fin.Name(), anubis.DefaultDifficulty, "info"); err != nil {
+				if _, err := ParseConfig(t.Context(), fin, fin.Name(), anubis.DefaultDifficulty, "info", false); err != nil {
 					t.Fatal(err)
 				}
 			})
@@ -77,7 +77,7 @@ func TestBadConfigs(t *testing.T) {
 			}
 			defer fin.Close()
 
-			if _, err := ParseConfig(ctx, fin, fin.Name(), anubis.DefaultDifficulty, "info"); err == nil {
+			if _, err := ParseConfig(ctx, fin, fin.Name(), anubis.DefaultDifficulty, "info", false); err == nil {
 				t.Fatal(err)
 			} else {
 				t.Log(err)

package.json

@@ -20,11 +20,11 @@
   "author": "",
   "license": "ISC",
   "devDependencies": {
-    "@commitlint/cli": "^20.5.0",
-    "@commitlint/config-conventional": "^20.5.0",
-    "baseline-browser-mapping": "^2.10.15",
-    "cssnano": "^7.1.4",
-    "cssnano-preset-advanced": "^7.0.12",
+    "@commitlint/cli": "^21.0.1",
+    "@commitlint/config-conventional": "^21.0.1",
+    "baseline-browser-mapping": "^2.10.30",
+    "cssnano": "^8.0.1",
+    "cssnano-preset-advanced": "^8.0.1",
     "esbuild": "^0.28.0",
     "husky": "^9.1.7",
     "playwright": "^1.52.0",
@@ -32,11 +32,11 @@
     "postcss-import": "^16.1.1",
     "postcss-import-url": "^7.2.0",
     "postcss-url": "^10.1.3",
-    "prettier": "^3.8.1"
+    "prettier": "^3.8.3"
   },
   "dependencies": {
     "@aws-crypto/sha256-js": "^5.2.0",
-    "preact": "^10.29.1"
+    "preact": "^10.29.2"
   },
   "commitlint": {
     "extends": [

test/traefik/anubis.yaml

@@ -0,0 +1,16 @@
+bots:
+  - name: block-admin-via-regex
+    path_regex: ^/admin(/.*)?$
+    action: DENY
+
+  - name: block-secret-via-cel
+    expression:
+      all:
+        - 'path.startsWith("/api/secret")'
+    action: DENY
+
+  - import: (data)/meta/default-config.yaml
+
+status_codes:
+  CHALLENGE: 200
+  DENY: 403

test/traefik/docker-compose.yaml

@@ -0,0 +1,27 @@
+services:
+  traefik:
+    image: traefik:v3.3
+    restart: always
+    ports:
+      - 8080:80
+    volumes:
+      - ./traefik.yml:/etc/traefik/traefik.yml:ro
+      - ./http.yaml:/config/http.yaml:ro
+
+  anubis:
+    image: ko.local/anubis
+    restart: always
+    environment:
+      BIND: ":8080"
+      TARGET: " "
+      POLICY_FNAME: /etc/techaro/anubis.yaml
+      PUBLIC_URL: http://localhost:8080/.within.website/x/cmd/anubis
+      COOKIE_DOMAIN: localhost
+      USE_REMOTE_ADDRESS: "true"
+    volumes:
+      - ./anubis.yaml:/etc/techaro/anubis.yaml
+
+  backend:
+    image: ghcr.io/xe/x/httpdebug
+    pull_policy: always
+    restart: always

test/traefik/http.yaml

@@ -0,0 +1,30 @@
+http:
+  middlewares:
+    anubis:
+      forwardAuth:
+        address: http://anubis:8080/.within.website/x/cmd/anubis/api/check
+        trustForwardHeader: true
+
+  routers:
+    anubis-assets:
+      rule: Host(`localhost`) && PathPrefix(`/.within.website/x/cmd/anubis`)
+      entryPoints:
+        - web
+      service: anubis
+    backend:
+      rule: Host(`localhost`)
+      entryPoints:
+        - web
+      service: backend
+      middlewares:
+        - anubis
+
+  services:
+    anubis:
+      loadBalancer:
+        servers:
+          - url: http://anubis:8080
+    backend:
+      loadBalancer:
+        servers:
+          - url: http://backend:3000

test/traefik/test.mjs

@@ -0,0 +1,33 @@
+// Smoke test for https://github.com/TecharoHQ/anubis/issues/1628
+//
+// Traefik's forwardAuth middleware calls Anubis at the literal path
+// /.within.website/x/cmd/anubis/api/check and conveys the original URL in the
+// X-Forwarded-Uri header. Path-targeting policy rules must match that header
+// (not r.URL.Path), otherwise every request looks like a request to /check.
+
+const BASE = "http://localhost:8080";
+const UA = "Mozilla/5.0 (compatible; AnubisTraefikSmoke/1.0)";
+
+const cases = [
+  { path: "/", expected: 307, why: "control: no DENY rule, default challenge redirect" },
+  { path: "/free", expected: 307, why: "control: no DENY rule, default challenge redirect" },
+  { path: "/admin", expected: 403, why: "path_regex must match X-Forwarded-Uri, not 307 or 200" },
+  { path: "/admin/users", expected: 403, why: "path_regex must match X-Forwarded-Uri, not 307 or 200" },
+  { path: "/api/secret", expected: 403, why: "CEL path must match X-Forwarded-Uri, not 307 or 200" },
+];
+
+let failed = false;
+
+for (const c of cases) {
+  const resp = await fetch(`${BASE}${c.path}`, {
+    headers: { "User-Agent": UA },
+    redirect: "manual",
+  });
+  const ok = resp.status === c.expected;
+  console.log(
+    `${ok ? "PASS" : "FAIL"}: GET ${c.path} → ${resp.status} (want ${c.expected}: ${c.why})`,
+  );
+  if (!ok) failed = true;
+}
+
+process.exit(failed ? 1 : 0);

test/traefik/test.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -eo pipefail
+
+export VERSION=${GITHUB_SHA:-devel}-test
+export KO_DOCKER_REPO=ko.local
+
+set -u
+
+source ../lib/lib.sh
+
+build_anubis_ko
+
+function cleanup() {
+	docker compose down -t 1 || :
+}
+
+trap cleanup EXIT SIGINT
+
+docker compose up -d
+
+backoff-retry --try-count 20 node ./test.mjs

test/traefik/traefik.yml

@@ -0,0 +1,8 @@
+entryPoints:
+  web:
+    address: ":80"
+
+providers:
+  file:
+    directory: /config
+    watch: false

test/traefik/var/.gitignore

@@ -0,0 +1,2 @@
+*
+!.gitignore

web/index.go

@@ -7,17 +7,43 @@ import (
 
 	"github.com/a-h/templ"
 
+	"github.com/TecharoHQ/anubis"
 	"github.com/TecharoHQ/anubis/lib/challenge"
 	"github.com/TecharoHQ/anubis/lib/config"
 	"github.com/TecharoHQ/anubis/lib/localization"
 )
 
+// Options carries per-server render state for Anubis pages. Embedders can
+// render multiple Server instances in one process without mutating package
+// globals.
+type Options struct {
+	BasePrefix string
+	PublicURL  string
+}
+
+// DefaultOptions preserves the legacy package-global behavior for callers that
+// render web components directly.
+func DefaultOptions() Options {
+	return Options{
+		BasePrefix: anubis.BasePrefix,
+		PublicURL:  anubis.PublicUrl,
+	}
+}
+
 func Base(title string, body templ.Component, impressum *config.Impressum, localizer *localization.SimpleLocalizer) templ.Component {
-	return base(title, body, impressum, nil, nil, localizer)
+	return BaseWithOptions(DefaultOptions(), title, body, impressum, localizer)
+}
+
+func BaseWithOptions(opts Options, title string, body templ.Component, impressum *config.Impressum, localizer *localization.SimpleLocalizer) templ.Component {
+	return base(opts, title, body, impressum, nil, nil, localizer)
 }
 
 func BaseWithChallengeAndOGTags(title string, body templ.Component, impressum *config.Impressum, challenge *challenge.Challenge, rules *config.ChallengeRules, ogTags map[string]string, localizer *localization.SimpleLocalizer) templ.Component {
-	return base(title, body, impressum, struct {
+	return BaseWithChallengeAndOGTagsWithOptions(DefaultOptions(), title, body, impressum, challenge, rules, ogTags, localizer)
+}
+
+func BaseWithChallengeAndOGTagsWithOptions(opts Options, title string, body templ.Component, impressum *config.Impressum, challenge *challenge.Challenge, rules *config.ChallengeRules, ogTags map[string]string, localizer *localization.SimpleLocalizer) templ.Component {
+	return base(opts, title, body, impressum, struct {
 		Rules     *config.ChallengeRules `json:"rules"`
 		Challenge any                    `json:"challenge"`
 	}{
@@ -27,11 +53,27 @@ func BaseWithChallengeAndOGTags(title string, body templ.Component, impressum *c
 }
 
 func ErrorPage(msg, mail, code string, localizer *localization.SimpleLocalizer) templ.Component {
-	return errorPage(msg, mail, code, localizer)
+	return ErrorPageWithOptions(DefaultOptions(), msg, mail, code, localizer)
+}
+
+func ErrorPageWithOptions(opts Options, msg, mail, code string, localizer *localization.SimpleLocalizer) templ.Component {
+	return errorPage(opts, msg, mail, code, localizer)
+}
+
+func StaticHappy(localizer *localization.SimpleLocalizer) templ.Component {
+	return StaticHappyWithOptions(DefaultOptions(), localizer)
+}
+
+func StaticHappyWithOptions(opts Options, localizer *localization.SimpleLocalizer) templ.Component {
+	return staticHappy(opts, localizer)
 }
 
 func Bench(localizer *localization.SimpleLocalizer) templ.Component {
-	return bench(localizer)
+	return BenchWithOptions(DefaultOptions(), localizer)
+}
+
+func BenchWithOptions(opts Options, localizer *localization.SimpleLocalizer) templ.Component {
+	return bench(opts, localizer)
 }
 
 func honeypotLink(href string) templ.Component {

web/index.templ

@@ -9,12 +9,12 @@ import (
 	"github.com/google/uuid"
 )
 
-templ base(title string, body templ.Component, impressum *config.Impressum, challenge any, ogTags map[string]string, localizer *localization.SimpleLocalizer) {
+templ base(opts Options, title string, body templ.Component, impressum *config.Impressum, challenge any, ogTags map[string]string, localizer *localization.SimpleLocalizer) {
 	<!DOCTYPE html>
 	<html lang={ localizer.GetLang() }>
 		<head>
 			<title>{ title }</title>
-			<link rel="stylesheet" href={ anubis.BasePrefix + xess.URL }/>
+			<link rel="stylesheet" href={ opts.BasePrefix + xess.URL }/>
 			<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
 			<meta name="robots" content="noindex,nofollow"/>
 			for key, value := range ogTags {
@@ -60,11 +60,11 @@ templ base(title string, body templ.Component, impressum *config.Impressum, chal
     	</style>
 			@templ.JSONScript("anubis_version", anubis.Version)
 			@templ.JSONScript("anubis_challenge", challenge)
-			@templ.JSONScript("anubis_base_prefix", anubis.BasePrefix)
-			@templ.JSONScript("anubis_public_url", anubis.PublicUrl)
+			@templ.JSONScript("anubis_base_prefix", opts.BasePrefix)
+			@templ.JSONScript("anubis_public_url", opts.PublicURL)
 		</head>
 		<body id="top">
-			@honeypotLink(anubis.BasePrefix + fmt.Sprintf("%shoneypot/%s/init", anubis.APIPrefix, uuid.NewString()))
+			@honeypotLink(opts.BasePrefix + fmt.Sprintf("%shoneypot/%s/init", anubis.APIPrefix, uuid.NewString()))
 			<main>
 				<h1 id="title" class="centered-div">{ title }</h1>
 				@body
@@ -79,7 +79,7 @@ templ base(title string, body templ.Component, impressum *config.Impressum, chal
 						if impressum != nil {
 							<p>
 								@templ.Raw(impressum.Footer)
-								-- <a href={ templ.SafeURL(anubis.BasePrefix + fmt.Sprintf("%simprint", anubis.APIPrefix)) }>Imprint</a>
+								-- <a href={ templ.SafeURL(opts.BasePrefix + fmt.Sprintf("%simprint", anubis.APIPrefix)) }>Imprint</a>
 							</p>
 						}
 						<p>{ localizer.T("version_info") } <code>{ anubis.Version }</code>.</p>
@@ -90,9 +90,9 @@ templ base(title string, body templ.Component, impressum *config.Impressum, chal
 	</html>
 }
 
-templ errorPage(message, mail, code string, localizer *localization.SimpleLocalizer) {
+templ errorPage(opts Options, message, mail, code string, localizer *localization.SimpleLocalizer) {
 	<div class="centered-div">
-		<img id="image" alt="Sad Anubis" style="width:100%;max-width:256px;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/reject.webp?cacheBuster=" + anubis.Version }/>
+		<img id="image" alt="Sad Anubis" style="width:100%;max-width:256px;" src={ opts.BasePrefix + "/.within.website/x/cmd/anubis/static/img/reject.webp?cacheBuster=" + anubis.Version }/>
 		<p>{ message }.</p>
 		if code != "" {
 			<code><pre>{ code }</pre></code>
@@ -110,19 +110,19 @@ templ errorPage(message, mail, code string, localizer *localization.SimpleLocali
 	</div>
 }
 
-templ StaticHappy(localizer *localization.SimpleLocalizer) {
+templ staticHappy(opts Options, localizer *localization.SimpleLocalizer) {
 	<div class="centered-div">
 		<img
 			style="display:none;"
 			style="width:100%;max-width:256px;"
-			src={ "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" +
+			src={ opts.BasePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" +
     anubis.Version }
 		/>
 		<p>{ localizer.T("static_check_endpoint") }</p>
 	</div>
 }
 
-templ bench(localizer *localization.SimpleLocalizer) {
+templ bench(opts Options, localizer *localization.SimpleLocalizer) {
 	<div style="height:20rem;display:flex">
 		<table style="margin-top:1rem;display:grid;grid-template:auto 1fr/auto auto;gap:0 0.5rem">
 			<thead
@@ -145,9 +145,9 @@ templ bench(localizer *localization.SimpleLocalizer) {
 			></tbody>
 		</table>
 		<div class="centered-div">
-			<img id="image" style="width:100%;max-width:256px;" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version }/>
+			<img id="image" style="width:100%;max-width:256px;" src={ opts.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version }/>
 			<p id="status" style="max-width:256px">{ localizer.T("loading") }</p>
-			<script async type="module" src={ anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/js/bench.mjs?cacheBuster=" + anubis.Version }></script>
+			<script async type="module" src={ opts.BasePrefix + "/.within.website/x/cmd/anubis/static/js/bench.mjs?cacheBuster=" + anubis.Version }></script>
 			<div id="sparkline"></div>
 			<noscript>
 				<p>{ localizer.T("benchmark_requires_js") }</p>

web/index_templ.go

@@ -17,7 +17,7 @@ import (
 	"github.com/google/uuid"
 )
 
-func base(title string, body templ.Component, impressum *config.Impressum, challenge any, ogTags map[string]string, localizer *localization.SimpleLocalizer) templ.Component {
+func base(opts Options, title string, body templ.Component, impressum *config.Impressum, challenge any, ogTags map[string]string, localizer *localization.SimpleLocalizer) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -69,9 +69,9 @@ func base(title string, body templ.Component, impressum *config.Impressum, chall
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var4 templ.SafeURL
-		templ_7745c5c3_Var4, templ_7745c5c3_Err = templ.JoinURLErrs(anubis.BasePrefix + xess.URL)
+		templ_7745c5c3_Var4, templ_7745c5c3_Err = templ.JoinURLErrs(opts.BasePrefix + xess.URL)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 17, Col: 61}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 17, Col: 59}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var4))
 		if templ_7745c5c3_Err != nil {
@@ -125,11 +125,11 @@ func base(title string, body templ.Component, impressum *config.Impressum, chall
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templ.JSONScript("anubis_base_prefix", anubis.BasePrefix).Render(ctx, templ_7745c5c3_Buffer)
+		templ_7745c5c3_Err = templ.JSONScript("anubis_base_prefix", opts.BasePrefix).Render(ctx, templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templ.JSONScript("anubis_public_url", anubis.PublicUrl).Render(ctx, templ_7745c5c3_Buffer)
+		templ_7745c5c3_Err = templ.JSONScript("anubis_public_url", opts.PublicURL).Render(ctx, templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -137,7 +137,7 @@ func base(title string, body templ.Component, impressum *config.Impressum, chall
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = honeypotLink(anubis.BasePrefix+fmt.Sprintf("%shoneypot/%s/init", anubis.APIPrefix, uuid.NewString())).Render(ctx, templ_7745c5c3_Buffer)
+		templ_7745c5c3_Err = honeypotLink(opts.BasePrefix+fmt.Sprintf("%shoneypot/%s/init", anubis.APIPrefix, uuid.NewString())).Render(ctx, templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -245,9 +245,9 @@ func base(title string, body templ.Component, impressum *config.Impressum, chall
 				return templ_7745c5c3_Err
 			}
 			var templ_7745c5c3_Var13 templ.SafeURL
-			templ_7745c5c3_Var13, templ_7745c5c3_Err = templ.JoinURLErrs(templ.SafeURL(anubis.BasePrefix + fmt.Sprintf("%simprint", anubis.APIPrefix)))
+			templ_7745c5c3_Var13, templ_7745c5c3_Err = templ.JoinURLErrs(templ.SafeURL(opts.BasePrefix + fmt.Sprintf("%simprint", anubis.APIPrefix)))
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 82, Col: 98}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 82, Col: 96}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var13))
 			if templ_7745c5c3_Err != nil {
@@ -292,7 +292,7 @@ func base(title string, body templ.Component, impressum *config.Impressum, chall
 	})
 }
 
-func errorPage(message, mail, code string, localizer *localization.SimpleLocalizer) templ.Component {
+func errorPage(opts Options, message, mail, code string, localizer *localization.SimpleLocalizer) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -318,9 +318,9 @@ func errorPage(message, mail, code string, localizer *localization.SimpleLocaliz
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var17 string
-		templ_7745c5c3_Var17, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/reject.webp?cacheBuster=" + anubis.Version)
+		templ_7745c5c3_Var17, templ_7745c5c3_Err = templ.JoinStringErrs(opts.BasePrefix + "/.within.website/x/cmd/anubis/static/img/reject.webp?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 95, Col: 181}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 95, Col: 179}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var17))
 		if templ_7745c5c3_Err != nil {
@@ -446,7 +446,7 @@ func errorPage(message, mail, code string, localizer *localization.SimpleLocaliz
 	})
 }
 
-func StaticHappy(localizer *localization.SimpleLocalizer) templ.Component {
+func staticHappy(opts Options, localizer *localization.SimpleLocalizer) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -472,7 +472,7 @@ func StaticHappy(localizer *localization.SimpleLocalizer) templ.Component {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var26 string
-		templ_7745c5c3_Var26, templ_7745c5c3_Err = templ.JoinStringErrs("/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" +
+		templ_7745c5c3_Var26, templ_7745c5c3_Err = templ.JoinStringErrs(opts.BasePrefix + "/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=" +
 			anubis.Version)
 		if templ_7745c5c3_Err != nil {
 			return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 119, Col: 18}
@@ -502,7 +502,7 @@ func StaticHappy(localizer *localization.SimpleLocalizer) templ.Component {
 	})
 }
 
-func bench(localizer *localization.SimpleLocalizer) templ.Component {
+func bench(opts Options, localizer *localization.SimpleLocalizer) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -606,9 +606,9 @@ func bench(localizer *localization.SimpleLocalizer) templ.Component {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var35 string
-		templ_7745c5c3_Var35, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version)
+		templ_7745c5c3_Var35, templ_7745c5c3_Err = templ.JoinStringErrs(opts.BasePrefix + "/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 148, Col: 166}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 148, Col: 164}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var35))
 		if templ_7745c5c3_Err != nil {
@@ -632,9 +632,9 @@ func bench(localizer *localization.SimpleLocalizer) templ.Component {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var37 string
-		templ_7745c5c3_Var37, templ_7745c5c3_Err = templ.JoinStringErrs(anubis.BasePrefix + "/.within.website/x/cmd/anubis/static/js/bench.mjs?cacheBuster=" + anubis.Version)
+		templ_7745c5c3_Var37, templ_7745c5c3_Err = templ.JoinStringErrs(opts.BasePrefix + "/.within.website/x/cmd/anubis/static/js/bench.mjs?cacheBuster=" + anubis.Version)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 150, Col: 138}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `index.templ`, Line: 150, Col: 136}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var37))
 		if templ_7745c5c3_Err != nil {

web/index_test.go

@@ -59,7 +59,7 @@ func TestBasePrefixInLinks(t *testing.T) {
 
 			// Render the base template to a buffer
 			var buf strings.Builder
-			component := base(tt.name, templ.NopComponent, impressum, nil, nil, localizer)
+			component := base(Options{BasePrefix: tt.basePrefix}, tt.name, templ.NopComponent, impressum, nil, nil, localizer)
 			err := component.Render(context.Background(), &buf)
 			if err != nil {
 				t.Fatalf("failed to render template: %v", err)