| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "io" |
| 5 | "net/http" |
| 6 | "regexp" |
| 7 | "strings" |
| 8 | "testing" |
| 9 | ) |
| 10 | |
| 11 | var cspNonceRE = regexp.MustCompile(`'nonce-([A-Za-z0-9+/=]+)'`) |
| 12 | |
| 13 | func TestSecurityHeaders(t *testing.T) { |
| 14 | ts, _ := newTestServer(t) |
| 15 | |
| 16 | // Static headers apply to every response, including non-page routes. |
| 17 | resp, err := http.Get(ts.URL + "/api/version") |
| 18 | if err != nil { |
| 19 | t.Fatal(err) |
| 20 | } |
| 21 | resp.Body.Close() |
| 22 | for k, want := range map[string]string{ |
| 23 | "X-Content-Type-Options": "nosniff", |
| 24 | "X-Frame-Options": "DENY", |
| 25 | "Referrer-Policy": "no-referrer", |
| 26 | } { |
| 27 | if got := resp.Header.Get(k); got != want { |
| 28 | t.Errorf("%s = %q, want %q", k, got, want) |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | // The chat page carries a nonce CSP. |
| 33 | resp, err = http.Get(ts.URL + "/") |
| 34 | if err != nil { |
| 35 | t.Fatal(err) |
| 36 | } |
| 37 | body, _ := io.ReadAll(resp.Body) |
| 38 | resp.Body.Close() |
| 39 | |
| 40 | csp := resp.Header.Get("Content-Security-Policy") |
| 41 | for _, want := range []string{ |
| 42 | "default-src 'self'", "script-src 'self' 'nonce-", |
| 43 | "object-src 'none'", "base-uri 'none'", "frame-ancestors 'none'", |
| 44 | } { |
| 45 | if !strings.Contains(csp, want) { |
| 46 | t.Errorf("CSP missing %q; got %q", want, csp) |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | // The CSP nonce must match the one substituted into the page's inline scripts, |
| 51 | // and no literal placeholder may remain. |
| 52 | m := cspNonceRE.FindStringSubmatch(csp) |
| 53 | if m == nil { |
| 54 | t.Fatalf("no nonce in CSP: %q", csp) |
| 55 | } |
| 56 | nonce := m[1] |
| 57 | if !strings.Contains(string(body), `<script nonce="`+nonce+`">`) { |
| 58 | t.Errorf("inline <script> nonce doesn't match CSP nonce %q", nonce) |
| 59 | } |
| 60 | if strings.Contains(string(body), "__CSP_NONCE__") { |
| 61 | t.Errorf("literal __CSP_NONCE__ placeholder left unsubstituted") |
| 62 | } |
| 63 | |
| 64 | // Nonces are fresh per request. |
| 65 | resp2, _ := http.Get(ts.URL + "/") |
| 66 | csp2 := resp2.Header.Get("Content-Security-Policy") |
| 67 | resp2.Body.Close() |
| 68 | if m2 := cspNonceRE.FindStringSubmatch(csp2); m2 != nil && m2[1] == nonce { |
| 69 | t.Errorf("nonce reused across requests: %q", nonce) |
| 70 | } |
| 71 | } |
| 72 | |
amadan