CVE-2025-4123

@@ -159,16 +159,17 @@ func staticHandler(ctx *web.Context, log log.Logger, opt StaticOptions) bool {
 	if fi.IsDir() {
 		// Redirect if missing trailing slash.
 		if !strings.HasSuffix(ctx.Req.URL.Path, "/") {
-			path := fmt.Sprintf("%s/", ctx.Req.URL.Path)
-			if !strings.HasPrefix(path, "/") {
+			redirectPath := path.Clean(ctx.Req.URL.Path)
+			redirectPath = fmt.Sprintf("%s/", redirectPath)
+			if !strings.HasPrefix(redirectPath, "/") {
 				// Disambiguate that it's a path relative to this server
-				path = fmt.Sprintf("/%s", path)
+				redirectPath = fmt.Sprintf("/%s", redirectPath)
 			} else {
 				// A string starting with // or /\ is interpreted by browsers as a URL, and not a server relative path
 				rePrefix := regexp.MustCompile(`^(?:/\\|/+)`)
-				path = rePrefix.ReplaceAllString(path, "/")
+				redirectPath = rePrefix.ReplaceAllString(redirectPath, "/")
 			}
-			http.Redirect(ctx.Resp, ctx.Req, path, http.StatusFound)
+			http.Redirect(ctx.Resp, ctx.Req, redirectPath, http.StatusFound)
 			return true
 		}
 

@@ -0,0 +1,177 @@
+package httpstatic
+
+import (
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+
+	claims "github.com/grafana/authlib/types"
+	"github.com/grafana/grafana/pkg/models/usertoken"
+	"github.com/grafana/grafana/pkg/services/authn"
+	"github.com/grafana/grafana/pkg/services/authn/authntest"
+	"github.com/grafana/grafana/pkg/services/contexthandler"
+	"github.com/grafana/grafana/pkg/services/featuremgmt"
+	"github.com/grafana/grafana/pkg/setting"
+	"github.com/grafana/grafana/pkg/web"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestStatic(t *testing.T) {
+	// Create a temporary directory for test files
+	tmpDir, err := os.MkdirTemp("", "static-test")
+	require.NoError(t, err)
+	defer func() {
+		err := os.RemoveAll(tmpDir)
+		require.NoError(t, err)
+	}()
+
+	// Create test files
+	testFiles := map[string]string{
+		"test.txt":        "Test content",
+		"subdir/test.txt": "Subdir content",
+	}
+
+	for path, content := range testFiles {
+		fullPath := filepath.Join(tmpDir, path)
+		err := os.MkdirAll(filepath.Dir(fullPath), 0o750)
+		require.NoError(t, err)
+		err = os.WriteFile(fullPath, []byte(content), 0o644)
+		require.NoError(t, err)
+	}
+
+	tests := []struct {
+		dir              string
+		name             string
+		path             string
+		options          StaticOptions
+		expectedStatus   int
+		expectedBody     string
+		expectedLocation string
+	}{
+		{
+			name:           "should serve existing file",
+			path:           "/test.txt",
+			expectedStatus: http.StatusOK,
+			expectedBody:   "Test content",
+			dir:            tmpDir,
+		},
+		{
+			name:           "should serve file from subdirectory",
+			path:           "/subdir/test.txt",
+			expectedStatus: http.StatusOK,
+			expectedBody:   "Subdir content",
+			dir:            tmpDir,
+		},
+
+		{
+			name:             "should redirect directory without trailing slash",
+			path:             "/subdir",
+			expectedStatus:   http.StatusFound,
+			expectedLocation: "/subdir/",
+			dir:              tmpDir,
+		},
+		{
+			name:           "should handle prefix",
+			path:           "/static/test.txt",
+			options:        StaticOptions{Prefix: "/static"},
+			expectedStatus: http.StatusOK,
+			expectedBody:   "Test content",
+			dir:            tmpDir,
+		},
+		{
+			name:           "should handle excluded path",
+			path:           "/test.txt",
+			options:        StaticOptions{Exclude: []string{"/test.txt"}},
+			expectedStatus: http.StatusNotFound,
+			dir:            tmpDir,
+		},
+		{
+			name:           "should add custom headers",
+			path:           "/test.txt",
+			options:        StaticOptions{AddHeaders: func(ctx *web.Context) { ctx.Resp.Header().Set("X-Test", "test") }},
+			expectedStatus: http.StatusOK,
+			expectedBody:   "Test content",
+			dir:            tmpDir,
+		},
+		{
+			name:             "should clean up path before redirecting",
+			path:             "/subdir/..%2F%5C127.0.0.1:80%2F%3F%2F..%2F..",
+			options:          StaticOptions{Prefix: "subdir"},
+			expectedStatus:   http.StatusFound,
+			expectedLocation: "/",
+			dir:              tmpDir,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			sc := setupScenarioContext(t, "")
+			sc.m.Use(Static(tt.dir, tt.options))
+
+			// Create a test request
+			req := httptest.NewRequest("GET", tt.path, nil)
+			w := httptest.NewRecorder()
+
+			// Execute the handler
+			sc.m.ServeHTTP(w, req)
+
+			// Verify the response
+			resp := w.Result()
+			require.Equal(t, tt.expectedStatus, resp.StatusCode)
+
+			if tt.expectedBody != "" {
+				body, err := io.ReadAll(resp.Body)
+				require.NoError(t, err)
+				assert.Equal(t, tt.expectedBody, string(body))
+			}
+
+			if tt.options.AddHeaders != nil {
+				assert.Equal(t, "test", resp.Header.Get("X-Test"))
+			}
+
+			if tt.expectedLocation != "" {
+				assert.Equal(t, tt.expectedLocation, resp.Header.Get("Location"))
+			}
+		})
+	}
+}
+
+type scenarioContext struct {
+	t       *testing.T
+	cfg     *setting.Cfg
+	m       *web.Mux
+	ctxHdlr *contexthandler.ContextHandler
+}
+
+func getContextHandler(t *testing.T, cfg *setting.Cfg) *contexthandler.ContextHandler {
+	t.Helper()
+
+	if cfg == nil {
+		cfg = setting.NewCfg()
+	}
+
+	return contexthandler.ProvideService(
+		cfg,
+		&authntest.FakeService{ExpectedIdentity: &authn.Identity{ID: "0", Type: claims.TypeAnonymous, SessionToken: &usertoken.UserToken{}}},
+		featuremgmt.WithFeatures(),
+	)
+}
+
+func setupScenarioContext(t *testing.T, url string) *scenarioContext {
+	cfg := setting.NewCfg()
+	ctxHdlr := getContextHandler(t, cfg)
+	sc := &scenarioContext{
+		t:       t,
+		cfg:     cfg,
+		ctxHdlr: ctxHdlr,
+	}
+
+	sc.m = web.New()
+	sc.m.Use(ctxHdlr.Middleware)
+
+	return sc
+}