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🛡️ Sentinel: [HIGH] Fix Stored XSS in HTML Output #116
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| package handler | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "net/http" | ||
| "net/http/httptest" | ||
| "net/url" | ||
| "strings" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestXSSVulnerability(t *testing.T) { | ||
| // Malicious HTML payload | ||
| htmlBody := ` | ||
| <!DOCTYPE html> | ||
| <html> | ||
| <head><title>XSS Test</title></head> | ||
| <body> | ||
| <h1>XSS Test</h1> | ||
| <p>Safe content</p> | ||
| <script>alert('XSS')</script> | ||
| <img src="x" onerror="alert('img XSS')"> | ||
| <a href="javascript:alert('link XSS')">Click me</a> | ||
| </body> | ||
| </html>` | ||
|
|
||
| srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| if _, err := w.Write([]byte(htmlBody)); err != nil { | ||
| t.Errorf("failed to write response: %v", err) | ||
| } | ||
| })) | ||
| defer srv.Close() | ||
|
|
||
| // Override httpClient | ||
| oldClient := httpClient | ||
| httpClient = srv.Client() | ||
| defer func() { httpClient = oldClient }() | ||
|
|
||
| u, err := url.Parse(srv.URL) | ||
| if err != nil { | ||
| t.Fatalf("failed to parse server URL: %v", err) | ||
| } | ||
|
|
||
| ctx := context.Background() | ||
| req := httptest.NewRequest("GET", "/", nil) | ||
|
|
||
| // Fetch and parse | ||
| art, err := fetchAndParse(ctx, u, req) | ||
| if err != nil { | ||
| t.Fatalf("fetchAndParse failed: %v", err) | ||
| } | ||
|
|
||
| contentBuf := &bytes.Buffer{} | ||
| if err := art.RenderHTML(contentBuf); err != nil { | ||
| t.Fatalf("failed to render HTML: %v", err) | ||
| } | ||
|
|
||
| // We must test the output of formatHTML, which applies the sanitization | ||
| rec := httptest.NewRecorder() | ||
| formatHTML(rec, art, contentBuf) | ||
|
|
||
| resp := rec.Result() | ||
| bodyBuf := new(bytes.Buffer) | ||
| bodyBuf.ReadFrom(resp.Body) | ||
| content := bodyBuf.String() | ||
|
|
||
| // Check for XSS vectors | ||
| t.Logf("Rendered content: %s", content) | ||
|
|
||
| if strings.Contains(content, "<script>") { | ||
| t.Error("VULNERABILITY: <script> tag not stripped") | ||
| } | ||
| if strings.Contains(content, "onerror") { | ||
| t.Error("VULNERABILITY: onerror handler not stripped") | ||
| } | ||
| if strings.Contains(content, "javascript:") { | ||
| t.Error("VULNERABILITY: javascript: URI not stripped") | ||
| } | ||
| } | ||
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The security fix for XSS was applied to both
formatHTMLandformatJSON. This test currently only validates theformatHTMLoutput. To ensure complete test coverage for the fix, you should also verify the output offormatJSON.A good way to achieve this is by refactoring the test to be table-driven, which would allow you to easily test multiple formatters with the same setup logic. This also makes it easier to add tests for other formatters in the future.