Forward fresh-login requirements to the authentication provider

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a092fe-13b1-7f12-ac74-7d258af4d79c

src/internal/adapters/authelia/adapter.go

@@ -8,6 +8,7 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"strconv"
 	"strings"
 	"time"
 
@@ -54,6 +55,12 @@ func (a *AutheliaAdapter) AuthorizeURL(_ context.Context, req domain.AuthRequest
 	q.Set("response_type", "code")
 	q.Set("state", req.State)
 	q.Set("scope", "openid profile email groups")
+	if req.PromptLogin {
+		q.Set("prompt", "login")
+	}
+	if req.MaxAge != nil {
+		q.Set("max_age", strconv.FormatInt(int64(req.MaxAge.Seconds()), 10))
+	}
 
 	return base + "?" + q.Encode(), nil
 }

src/internal/adapters/authelia/adapter_test.go

@@ -452,3 +452,23 @@ func TestHandleCallback_AuthResultContainsNoRawTokens(t *testing.T) {
 		t.Error("AuthResult.Claims must not expose raw access_token — security boundary violation")
 	}
 }
+
+func TestAuthorizeURLForwardsFreshLoginRequirements(t *testing.T) {
+	adapter := authelia.New(testConfig(), &mockHTTPClient{})
+	for _, seconds := range []int{0, 60} {
+		age := time.Duration(seconds) * time.Second
+		target, err := adapter.AuthorizeURL(context.Background(), domain.AuthRequest{PromptLogin: true, MaxAge: &age})
+		if err != nil {
+			t.Fatal(err)
+		}
+		parsed, _ := url.Parse(target)
+		if parsed.Query().Get("prompt") != "login" || parsed.Query().Get("max_age") != fmt.Sprint(seconds) {
+			t.Fatalf("freshness requirements missing from provider URL: %s", target)
+		}
+	}
+	target, _ := adapter.AuthorizeURL(context.Background(), domain.AuthRequest{})
+	parsed, _ := url.Parse(target)
+	if parsed.Query().Has("prompt") || parsed.Query().Has("max_age") {
+		t.Fatal("ordinary SSO was changed")
+	}
+}

src/internal/config/config_test.go

@@ -386,8 +386,8 @@ func TestServiceClientExampleContracts(t *testing.T) {
 	if errs := config.ValidateConfig(cfg); len(errs) != 0 {
 		t.Fatalf("service client examples must validate: %v", errs)
 	}
-	if len(cfg.Clients) != 4 {
-		t.Fatalf("service client examples: want 4, got %d", len(cfg.Clients))
+	if len(cfg.Clients) != 5 {
+		t.Fatalf("client examples: want 4 service clients and 1 human client, got %d", len(cfg.Clients))
 	}
 
 	codingAgent := cfg.Clients[0]

src/internal/domain/auth.go

@@ -3,6 +3,7 @@ package domain
 import (
 	"context"
 	"errors"
+	"time"
 )
 
 // AuthProvider handles login UI delegation and session management.
@@ -18,6 +19,9 @@ type AuthProvider interface {
 
 // AuthRequest contains the parameters for initiating an auth flow.
 type AuthRequest struct {
+	// Forward interactive freshness requirements to the actual login provider.
+	PromptLogin         bool
+	MaxAge              *time.Duration
 	ClientID            string
 	RedirectURI         string
 	State               string

src/internal/server/oidc/authorize.go

@@ -246,6 +246,8 @@ func (h *AuthorizeHandler) serveAuthorize(w http.ResponseWriter, r *http.Request
 
 	// Delegate to Auth provider.
 	authURL, err := h.Auth.AuthorizeURL(ctx, domain.AuthRequest{
+		PromptLogin:         promptLogin,
+		MaxAge:              maxAge,
 		ClientID:            clientID,
 		RedirectURI:         redirectURI,
 		State:               state,

src/internal/server/oidc/authorize_test.go

@@ -22,6 +22,7 @@ import (
 
 // mockAuthProvider implements domain.AuthProvider.
 type mockAuthProvider struct {
+	request      domain.AuthRequest
 	authorizeURL string
 	authorizeErr error
 
@@ -29,7 +30,8 @@ type mockAuthProvider struct {
 	callbackErr    error
 }
 
-func (m *mockAuthProvider) AuthorizeURL(_ context.Context, _ domain.AuthRequest) (string, error) {
+func (m *mockAuthProvider) AuthorizeURL(_ context.Context, req domain.AuthRequest) (string, error) {
+	m.request = req
 	if m.authorizeErr != nil {
 		return "", m.authorizeErr
 	}
@@ -871,3 +873,22 @@ func TestAuthorizeHandler_ServeHTTP_DispatchesToCallback(t *testing.T) {
 		}
 	}
 }
+
+func TestFreshLoginRequirementsReachProvider(t *testing.T) {
+	for _, age := range []string{"0", "60"} {
+		auth := &mockAuthProvider{authorizeURL: "https://auth.example/login"}
+		handler := newAuthorizeHandler(auth, &mockMFAProvider{}, &captureEmitter{})
+		params := validAuthorizeParams()
+		params.Set("prompt", "login")
+		params.Set("max_age", age)
+		response := httptest.NewRecorder()
+		handler.ServeHTTP(response, authorizeRequest(params))
+		if response.Code != http.StatusFound {
+			t.Fatalf("authorize failed: %d", response.Code)
+		}
+		expected, _ := time.ParseDuration(age + "s")
+		if !auth.request.PromptLogin || auth.request.MaxAge == nil || *auth.request.MaxAge != expected {
+			t.Fatalf("fresh login requirements lost before provider: %+v", auth.request)
+		}
+	}
+}